(19)
(11)EP 3 131 343 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.01.2018 Bulletin 2018/03

(21)Application number: 14890808.0

(22)Date of filing:  29.04.2014
(51)Int. Cl.: 
H04W 74/00  (2009.01)
H04W 74/08  (2009.01)
H04W 74/06  (2009.01)
H04W 88/06  (2009.01)
(86)International application number:
PCT/CN2014/076450
(87)International publication number:
WO 2015/165031 (05.11.2015 Gazette  2015/44)

(54)

RANDOM ACCESS DEVICE AND METHOD

DIREKTZUGRIFFVORRICHTUNG UND -VERFAHREN

DISPOSITIF ET PROCÉDÉ D'ACCÈS ALÉATOIRE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(43)Date of publication of application:
15.02.2017 Bulletin 2017/07

(73)Proprietor: Huawei Technologies Co. Ltd.
Shenzhen, Guangdong 518129 (CN)

(72)Inventors:
  • QUAN, Wei
    Shenzhen Guangdong 518129 (CN)
  • LI, Bingzhao
    Shenzhen Guangdong 518129 (CN)
  • YANG, Xiaodong
    Shenzhen Guangdong 518129 (CN)
  • HU, Zhenxing
    Shenzhen Guangdong 518129 (CN)
  • ZHANG, Jian
    Shenzhen Guangdong 518129 (CN)

(74)Representative: Thun, Clemens 
Mitscherlich PartmbB Patent- und Rechtsanwälte Sonnenstraße 33
80331 München
80331 München (DE)


(56)References cited: : 
CN-A- 101 547 440
CN-A- 103 580 840
US-A1- 2004 240 525
US-A1- 2013 301 591
US-A1- 2014 031 054
CN-A- 103 493 576
CN-A- 103 596 288
US-A1- 2008 069 041
US-A1- 2014 029 595
  
  • "Introducing LTE in Unlicensed Spectrum", 3GPP DRAFT; RP-131635 LTE IN UNLICENSED SPECTRUM, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE , no. Busan, South Korea; 20131203 - 20131207 2 December 2013 (2013-12-02), XP050733706, Retrieved from the Internet: URL:http://www.3gpp.org/ftp/Meetings_3GPP_ SYNC/RAN/RAN/Docs/ [retrieved on 2013-12-02]
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description

TECHNICAL FIELD



[0001] The present invention relates to the field of communications technologies, and in particular; to a random access apparatus and method.

BACKGROUND



[0002] A spectrum is a basis of wireless communication. Spectrum resources include a licensed spectrum resource and an unlicensed spectrum resource. Currently, a main technology that uses the unlicensed spectrum resource is wireless fidelity (Wireless Fidelity, WiFi). However, the WiFi has disadvantages in terms of mobility, security, quality of service (Quality of Service, QoS), and concurrent processing of multi-user scheduling. Therefore, applying an unlicensed spectrum to a Long Term Evolution (Long-term Evolution, LTE) device can not only result in effective use of the unlicensed spectrum resource, but also provide more effective wireless access and meet a growing demand for mobile broadband service. Therefore, in a future mobile communications scenario, both an LTE base station device and a WiFi device exist on the unlicensed spectrum. One of feasible solutions of using the unlicensed spectrum by the LTE base station is that the unlicensed spectrum is used as a secondary cell (Secondary Cell, Scell) of LTE user equipment (User Equipment, UE) and is configured for the UE, so that the LTE base station can perform data communication with the UE by using the unlicensed spectrum.

[0003] For example, US 2008/0069041A1 refers to a terminal which may transmit a RACH message over an unlicensed-use carrier frequency.

[0004] US 20140029595 A1 refers to a base station which communicates information necessary for random access to the mobile station device.

[0005] In an LTE system and in an LTE Advanced (LTE-Advanced, LTE-A) system, a random access procedure is required when data transmission is performed for using a licensed spectrum. Random access procedures are classified into a non-contention based random access procedure and a contention-based random access procedure. Random access parameters used in a random access procedure of the prior art, such as a physical random access channel resource and a parameter related to random access, are notified to UE mainly by using system broadcast information; for example, information such as a subframe or frequency channel number with the physical random access channel (Physical Random Access Channel, PRACH) resource, a random access code set, a random access code group, a maximum quantity of sending times of a random access code, and a size of a random access response message receiving window is notified to the UE. When the UE executes a contention-based random access procedure, the UE selects a random access code according to the random access parameters in the system message, and sends the selected random access code on a selected random access channel. When the UE executes a non-contention based random access procedure, the UE determines the random access channel based on the random access parameters in the system message and a random access channel mask sequence number notified by a base station by using a physical downlink control channel (Physical Downlink Control Channel, PDCCH) command, and sends, on the determined random access channel, the random access code notified by using the PDCCH command to the base station. After sending the random access code, the UE receives a random access response message in the random access response message receiving window in the random access parameters notified by the base station by using the system broadcast message.

[0006] Currently, a random access procedure is also required when data transmission is performed for using an unlicensed spectrum. However, because a contention and a collision may exist on an unlicensed spectrum resource, that is, the unlicensed spectrum resource may be sometimes available or sometimes unavailable. Therefore, if a PRACH resource on the unlicensed spectrum is also notified by using system broadcast information, it may occur that a subframe of the configured PRACH resource is unavailable, while an available subframe is not provided with the PRACH resource, and consequently the random access procedure cannot be executed on the unlicensed spectrum.

SUMMARY



[0007] Embodiments of the present invention provide a random access apparatus and method, which can implement that a random access procedure is executed on an unlicensed spectrum.

[0008] A first aspect of the embodiments of the present invention provides random access user equipment, and the user equipment may include:

a receiving module, configured to receive a notification message sent by a base station, where the notification message is used to instruct the user equipment UE to execute a random access procedure, and the notification message carries the following configuration parameters: a random access code used by the UE to execute the random access procedure, and information about a physical random access channel PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure, wherein the notification message further comprises a listening parameter that is used to listen on the unlicensed spectrum before the UE sends the random access code to the base station, wherein the listening parameter comprises at least one of a listening time, a backoff time, a power threshold, or an energy threshold;

a processing module, configured to determine, according to the configuration parameter in the notification message received by the receiving module, a PRACH resource used to execute the random access procedure; and

a sending module, configured to send the random access code to the base station on the PRACH resource determined by the processing module; where

the receiving module is configured to receive a random access response message sent by the base station, and determine, according to the random access response message, that the random access procedure is successfully completed.



[0009] With reference to the first aspect, in a first possible implementation manner, the notification message received by the receiving module may be specifically a radio resource control RRC message, a media access control MAC message, or a physical layer PHY message.

[0010] With reference to the first aspect, in a second possible implementation manner, the random access code that is used by the UE to execute the random access procedure and that is carried in the notification message received by the receiving module is specifically a dedicated random access code, or information used to instruct the UE to randomly select a random access code.

[0011] With reference to the first aspect, in a third possible implementation manner, the information that is about the PRACH resource and that is carried in the notification message received by the receiving module includes a frequency domain location of the PRACH resource or a time domain location of the PRACH resource, where the PRACH resource is configured on the unlicensed spectrum and is used by the UE to execute the random access procedure.

[0012] In a first possible implementation manner of the first aspect, the receiving module is specifically configured to:

determine a value of a random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource; and

decode, by using the RA-RNTI in a random access response receiving window, a scheduling command corresponding to the random access response message, and decode the random access response message according to the scheduling command.
In a second possible implementation manner of the first aspect a start location of the random access response receiving window is specifically an Nth subframe after the UE sends the random access code; or

a start location of the random access response receiving window is specifically an Nth subframe after the specified validity time; where

N is a non-zero natural number.



[0013] A second aspect of the embodiments of the present invention provides a random access method, and the method may include:

receiving, by user equipment UE, a notification message sent by a base station, where the notification message is used to instruct the UE to execute a random access procedure, and the notification message carries the following configuration parameters: a random access code used by the UE to execute the random access procedure, and information about a physical random access channel PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure, wherein the notification message further comprises a listening parameter that is used to listen on the unlicensed spectrum before the UE sends the random access code to the base station, wherein the listening parameter comprises at least one of a listening time, a backoff time, a power threshold, or an energy threshold;

determining, by the UE according to the configuration parameter in the notification message, a PRACH resource used to execute the random access procedure, and sending the random access code to the base station on the PRACH resource; and

receiving, by the UE, a random access response message sent by the base station, and determining, according to the random access response message, that the random access procedure is successfully completed.



[0014] With reference to the second aspect, in a first possible implementation manner, the notification message may be specifically a radio resource control RRC message, a media access control MAC message, or a physical layer PHY message.

[0015] With reference to the second aspect, in a second possible implementation manner, the random access code used by the UE to execute the random access procedure is specifically a dedicated random access code, or information used to instruct the UE to randomly select a random access code.

[0016] With reference to the second aspect, in a third possible implementation manner, the information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure includes a frequency domain location of the PRACH resource or a time domain location of the PRACH resource.

[0017] In the embodiments of the present invention, user equipment may determine, according to a notification message sent by a base station, a PRACH resource that is configured on an unlicensed spectrum and that is used to execute a random access procedure, send a random access code to the base station on the determined PRACH resource, and further receive, in a random access response receiving window configured by the base station, a random access response message sent by the base station, which can reduce a delay of implementing the random access procedure on the unlicensed spectrum, and reduce a probability of a collision during implementation of the random access procedure on the unlicensed spectrum, thereby implementing that the random access procedure is better executed on the unlicensed spectrum, and enhancing user experience of implementing the random access procedure on the unlicensed spectrum.

BRIEF DESCRIPTION OF DRAWINGS



[0018] To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention.

FIG. 1 is a schematic interaction diagram of a contention-based random access procedure in implementing a random access procedure on a licensed spectrum in the prior art;

FIG. 2 is a schematic interaction diagram of a non-contention based random access procedure in implementing a random access procedure on a licensed spectrum in the prior art;

FIG. 3 is a schematic structural diagram of a first embodiment of random access user equipment according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second embodiment of random access user equipment according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a first embodiment of a random access method according to an embodiment of the present invention; and

FIG. 6 is a schematic flowchart of a second embodiment of a random access method according to an embodiment of the present invention.



[0019] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some but not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] In specific implementation, to better describe a specific implementation process of implementing a random access procedure on an unlicensed spectrum, the following briefly describes a process of implementing random access on a licensed spectrum in the prior art.

[0021] In the prior art, implementing the random access procedure on the licensed spectrum may be classified into a non-contention based random access procedure and a contention-based random access procedure. Referring to FIG. 1, FIG. 1 is a schematic interaction diagram of the contention-based random access procedure in implementing the random access procedure on the licensed spectrum in the prior art, including:

Step 1: UE sends a preamble to a base station on an available PRACH resource.



[0022] In the prior art, in the contention-based random access procedure, the UE randomly selects a preamble, and sends the preamble to the base station on the available PRACH resource. The foregoing preamble and the available PRACH resource are notified to the UE by the base station by using a system broadcast message. On the licensed spectrum, because a PRACH resource is a resource on the licensed spectrum, neither contention nor collision exists. Therefore, the PRACH resource notified to the UE by the base station by using the system broadcast message is the available PRACH resource, and the UE may directly send information such as the preamble to the base station on the available PRACH resource notified by the foregoing base station.

[0023] Step 2: The base station sends a random access response message to the UE.

[0024] After receiving the preamble sent by the UE, the base station may send the random access response message to the UE. The random access response message carries uplink grant information and UE uplink timing advance information.

[0025] Step 3: The UE sends uplink information according to uplink grant information and timing advance information that are carried in the random access response message.

[0026] After receiving the random access response message sent by the base station, the UE may send the uplink information to the base station according to the uplink grant information and the timing advance information that are carried in the random access response message. The forgoing uplink information includes content that can identify the UE. That is, the base station may identify the UE according to the uplink information sent by the UE, and may further send a contention resolution message to the UE.

[0027] Step 4: The base station sends a contention resolution message to the UE.

[0028] After the base station sends the contention resolution message to the UE, the UE may determine, according to the received contention resolution message, whether the random access procedure is successfully completed. If it is learned, by means of determining, that the random access procedure is successfully completed, the UE may execute subsequent data receiving and sending procedures.

[0029] It may be learned from the foregoing that, in the prior art, when UE executes a contention-based random access procedure, the UE selects a random access code according to a random access parameter notified in a system broadcast message, and sends the selected random access code on a selected random access channel.

[0030] Referring to FIG. 2, FIG. 2 is a schematic interaction diagram of a non-contention based random access procedure in implementing a random access procedure on a licensed spectrum in the prior art, including:

Step 1: A base station configures a dedicated preamble for UE.



[0031] In the prior art, in the non-contention based random access procedure, the base station first configures a dedicated preamble for the UE. Optionally, the base station may further configure, for the UE, a PRACH resource for sending the preamble, and the UE may send information such as the preamble to the base station according to the preamble and the PRACH resource that are configured by the base station.

[0032] Step 2: The UE sends the dedicated preamble to the base station on an available PRACH resource.

[0033] In the prior art, because the random access procedure is performed on the licensed spectrum, neither contention nor collision exists. Therefore, the base station may configure the available PRACH resource for the UE, and after receiving the preamble and the PRACH resource that are configured by the base station, the UE may send the dedicated preamble to the base station on the available PRACH resource.

[0034] Step 3: The base station sends a random access response message to the user equipment.

[0035] After receiving the preamble sent by the UE, the base station sends the random access response message to the UE, where the foregoing random access response message carries uplink grant information and UE uplink timing advance information. After receiving the random access response message sent by the base station, the UE may consider that the random access procedure is successfully completed, and may further execute subsequent data receiving and sending procedures.

[0036] It may be learned from the foregoing that, in the prior art, in a non-contention based random access procedure, UE sends a dedicated preamble to a base station on an available PRACH resource according to the preamble and the available PRACH resource that are notified in a system broadcast message, receives, in a random access response message receiving window sent in the system broadcast message, a random access response message sent by the base station, and completes the random access procedure.

[0037] In the prior art, because the random access procedure is performed on a licensed spectrum, neither contention nor collision exists in a spectrum resource. Therefore, the base station may obtain the available PRACH resource, and may further notify the UE of the available PRACH resource by using the system broadcast message, and the UE may directly send information such as the preamble to the base station on the PRACH resource notified by the base station.

DESCRIPTION OF EMBODIMENTS



[0038] A random access procedure described in the embodiments of the present invention is a random access procedure implemented on an unlicensed spectrum. Because a contention or a collision may exist on a resource on the unlicensed spectrum, that is, the unlicensed spectrum resource may be sometimes available or sometimes unavailable. If a base station sends resource information to UE by using a system broadcast message, it may be that the resource is available when the base station sends the resource information to the UE, but when the UE receives the system broadcast message sent by the base
station, the resource information is occupied, that is, the resource is unavailable when the UE executes the random access procedure. Therefore, in the embodiments of the present invention, the base station cannot notify the UE of information about the available resource by using the system broadcast message. If a PRACH resource on the unlicensed spectrum is notified to the UE by using a method of the system broadcast message, it may occur that a subframe of the configured PRACH resource is unavailable, while an available subframe is not provided with the PRACH resource, so that the UE cannot execute the random access procedure on the unlicensed spectrum. To resolve the foregoing technical problem, the embodiments of the present invention provide a random access method. The UE may learn a configuration parameter of random access in real time from a notification message sent by the base station, and the UE may select the PRACH resource according to the configuration parameter carried in the notification message, and send information to the base station.

[0039] Referring to FIG. 3, FIG. 3 is a schematic structural diagram of a first embodiment of random access user equipment according to an embodiment of the present invention. The user equipment described in this embodiment includes:

a receiving module 10, configured to receive a notification message sent by a base station, where the notification message is used to instruct the user equipment UE to execute a random access procedure, and the notification message carries at least one of the following configuration parameters: a random access code used by the UE to execute the random access procedure, or information about a physical random access channel PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure;

a processing module 20, configured to determine, according to the configuration parameter in the notification message received by the receiving module, a PRACH resource used to execute the random access procedure; and

a sending module 30, configured to send the random access code to the base station on the PRACH resource determined by the processing module; where

the receiving module 10 is configured to receive a random access response message sent by the base station, and determine, according to the random access response message, that the random access procedure is successfully completed.



[0040] In specific implementation, because a contention and a collision may exist on an unlicensed spectrum resource, before instructing the UE to execute the random access procedure, the base station cannot determine a location of the specific available PRACH resource when the UE executes the random access procedure. Therefore, the base station cannot send the available PRACH resource to the UE by using system broadcast information, and the base station can instruct, only when the UE is required to execute the random access procedure and by using the notification message, the UE to execute the random access procedure and notify the UE of the available PRACH resource by using the notification message.

[0041] In some feasible implementation manners, when the UE is required by the base station to execute the random access procedure on the unlicensed spectrum, the base station may instruct, by sending the notification message to the UE, the UE to execute the random access procedure, and the UE may receive, by using the receiving module 10, the notification message sent by the base station. Specifically, the notification message received by the foregoing receiving module 10 may carry the random access code used by the UE to execute the random access procedure and the information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure. In specific implementation, the foregoing notification message may be specifically an RRC message, an MAC message, or a PHY message. Specifically, the random access code carried in the foregoing notification message may be a dedicated random access code, or may be information used to instruct the UE to randomly select a random access code. The information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the foregoing UE to execute the random access procedure may include a frequency domain location of the foregoing PRACH resource, a time domain location of the foregoing PRACH resource, or the like, for example, a specific PRACH resource, or a subframe that is in a time domain and in which the PRACH resource exists. The foregoing time domain information may be an absolute frame number and an absolute subframe number, or a subframe offset (for example, a sixth subframe behind a subframe of the foregoing notification message) relative to the foregoing notification message. This embodiment of the present invention imposes no limitation on the frequency domain location or the time domain location of the PRACH resource. That is, when instructing, by sending the notification message to the UE, the UE to execute the random access procedure, the base station may notify the UE of an obtained specific location of the available PRACH resource, and may further send, to the UE, the random access code used by the UE to execute the random access. The UE may receive the foregoing notification message by using the receiving module 10, determine, by using the processing module 20 according to the PRACH resource notified in the notification message received by the foregoing receiving module 10, the PRACH resource used to execute the random access procedure, and may further send, by using the sending module 30, the random access code to the base station on the PRACH resource determined by the foregoing processing module 20.

[0042] In some feasible implementation manners, the notification message may be sent to the UE by using a cell operating on a licensed spectrum when the base station sends the notification message used to instruct to execute the random access procedure to the UE. Specifically, the notification message may be sent to the UE by using a primary cell, or be sent to the UE by using a secondary cell. The UE may obtain, by using the foregoing primary cell or secondary cell, the notification message sent by the base station, where the foregoing primary cell or secondary cell may be pre-configured in a protocol, or may be configured by using another message, which is not limited herein.

[0043] In some feasible implementation manners, after the receiving module 10 of the UE receives the notification message sent by the base station, the processing module 20 may determine, according to the configuration parameter carried in the notification message received by the receiving module 10, the PRACH resource used to execute the random access procedure. Specifically, the configuration parameter carried in the notification message received by the foregoing receiving module 10 may include the random access code used by the foregoing UE to execute the random access procedure, the PRACH resource used by the foregoing UE to execute the random access procedure, and the like; the PRACH resource carried in the foregoing notification message is the PRACH resource that is configured on the unlicensed spectrum and that is obtained by the base station, and is the available PRACH resource determined by the base station. However, because of an inconsistency between a location of the base station and a location of the UE, the UE may be in a moving state. Therefore, after the base station determines the available PRACH resource and notifies the UE of the available PRACH resource by using the notification message, if the UE is in the moving state, the PRACH resource sent by the foregoing base station may be unavailable in a current location of the UE when the UE executes the random access procedure according to the notification message sent by the base station; after the receiving module 10 of the UE receives the notification message sent by the base station and obtains the available PRACH resource, the processing module 20 further needs to determine a location of a specific to-be-used PRACH resource in the foregoing available PRACH resource according to an actual location of the UE. That is, the processing module 20 of the UE may determine, according to the information that is about the PRACH resource and that is carried in the foregoing notification message, the location of the available PRACH resource, that is, the location of the available PRACH resource in the current location of the UE. After the UE determines the location of the specific available PRACH resource by using the processing module 20, the sending module 30 may send the random access code to the base station at the location of the foregoing PRACH resource, where the foregoing random access code is the random access code carried in the notification message. In specific implementation, for a specific implementation process in which the foregoing receiving module receives the notification message sent by the base station, refer to step S101 in a first embodiment of a random access method provided in an embodiment of the present invention, and details are not described herein again.

[0044] In some feasible implementation manners, after the sending module 30 of the UE sends the random access code to the base station, the receiving module 10 may receive, in a random access response receiving window configured by the base station, the random access response message sent by the base station, where the foregoing random access response receiving window may be learned from the notification message received by the foregoing receiving module 10, that is, the notification message received by the foregoing receiving module 10 may carry the random access response receiving window configured by the base station. In specific implementation, a scheduling command corresponding to the random access response message that is sent by the base station to the UE and that is received by the receiving module 10 may be scrambled by using an RA-RNTI. Before receiving the foregoing random access response message, the receiving module 10 of the UE further needs to determine a value of the foregoing RA-RNTI. Specifically, the value of the foregoing RA-RNTI may be fixed in the protocol, or may be determined according to a time domain location and a frequency domain location that are of the PRACH resource actually used by the UE, or be determined by using the received notification message; that is, the base station may notify the UE of the value of the foregoing RA-RNTI by using the foregoing notification message, and the receiving module 10 of the UE may determine the value of the random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource. After determining the value of the foregoing RA-RNTI, the receiving module 10 of the UE may decode, in the random access response receiving window by using the foregoing RA-RNTI, the scheduling command corresponding to the foregoing random access response message, and decode the random access response message according to the foregoing scheduling command, so as to obtain the random access response message sent by the base station. In specific implementation, a start location of the foregoing random access response receiving window may be an Nth subframe after the UE sends the random access code, or may be an Nth subframe after a specified time, that is, the start location of the foregoing random access response receiving window may be fixed in the protocol as the Nth subframe after the UE sends the random access code, and the start location of the random access response receiving window is notified to the UE by using the foregoing notification message, where N may be a non-zero natural number. In this way, no matter when the UE executes the random access procedure (sending the random access code to the base station), the random access response receiving window may start from the Nth subframe after the UE sends the random access code, or start from the Nth subframe after the specified time, which does not cause ambiguity, and may better implement the random access procedure on the unlicensed spectrum. In specific implementation, for a specific implementation process in which the foregoing processing module and sending module send the random access code to the base station according to the notification message sent by the base station, the foregoing processing module and receiving module receive, according to the notification message sent by the base station, the random access response message sent by the base station, refer to steps S102 to S103 in the first embodiment of the random access method provided in the embodiment of the present invention, and details are not described herein again.

[0045] The UE described in this embodiment of the present invention may receive a notification message sent by a base station, where the foregoing notification message carries a random access code used by the UE to execute a random access procedure and a PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure. The UE may determine, according to the foregoing notification message, a PRACH resource used by the UE to execute the random access procedure, send the random access code to the base station on the resource, and further receive, in a random access response receiving window configured by the base station, a random access response message sent by the base station, which implements that the random access procedure is executed on the unlicensed spectrum, reduces a probability of a collision in the random access procedure on the unlicensed spectrum, and enhances user experience of the random access procedure on the unlicensed spectrum.

[0046] Referring to FIG. 4, FIG. 4 is a schematic structural diagram of a second embodiment of random access user equipment according to an embodiment of the present invention. The user equipment described in this embodiment includes:

a receiving module 40, configured to receive a notification message sent by a base station, where the notification message is used to instruct the user equipment UE to execute a random access procedure, and the notification message carries at least one of the following configuration parameters: a random access code used by the UE to execute the random access procedure, or information about a physical random access channel PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure;

a processing module 50, configured to determine, according to the configuration parameter in the notification message received by the receiving module, a PRACH resource used to execute the random access procedure; and

a sending module 30, configured to send the random access code to the base station on the PRACH resource determined by the processing module; where

the receiving module 40 is configured to receive a random access response message sent by the base station, and determine, according to the random access response message, that the random access procedure is successfully completed.



[0047] In specific implementation, because a contention and a collision may exist on an unlicensed spectrum resource, before instructing the UE to execute the random access procedure, the base station cannot determine a location of the specific available PRACH resource when the UE executes the random access procedure. Therefore, the base station cannot send the available PRACH resource to the UE by using system broadcast information, and the base station can instruct, only when the UE is required to execute the random access procedure and by using the notification message, the UE to execute the random access procedure and notify the UE of the available PRACH resource by using the notification message.

[0048] In some feasible implementation manners, when the UE is required by the base station to execute the random access procedure on the unlicensed spectrum, the base station may instruct, by sending the notification message to the UE, the UE to execute the random access procedure, and the UE may receive, by using the receiving module 40, the notification message sent by the base station. Specifically, the notification message received by the foregoing receiving module 40 may carry the random access code used by the UE to execute the random access procedure and the information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure. In specific implementation, the foregoing notification message may be specifically an RRC message, an MAC message, or a PHY message. Specifically, the random access code carried in the foregoing notification message may be a dedicated random access code, or may be information used to instruct the UE to randomly select a random access code. The information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the foregoing UE to execute the random access procedure may include a frequency domain location of the foregoing PRACH resource, a time domain location of the foregoing PRACH resource, or the like, for example, a specific PRACH resource, or a subframe that is in a time domain and in which the PRACH resource exists. The foregoing time domain information may be an absolute frame number and an absolute subframe number, or a subframe offset (for example, a sixth subframe behind a subframe of the foregoing notification message) relative to the foregoing notification message. This embodiment of the present invention imposes no limitation on the frequency domain location or the time domain location of the PRACH resource. That is, when the base station instructs, by sending the notification message to the UE, the UE to execute the random access procedure, the UE may receive, by using the receiving module 40, the notification message sent by the base station, and learn the specific location of the available PRACH resource according to the notification message received by the receiving module 40, and may further send, to the UE, the random access code used by the UE to execute the random access. The processing module 50 of the UE may determine, according to the PRACH resource notified in the notification message received by the receiving module 40, the PRACH resource used to execute the random access procedure, and send, by using the sending module 30, the random access code to the base station on the PRACH resource determined by the foregoing processing module 50.

[0049] In some feasible implementation manners, the notification message may be sent to the UE by using a cell operating on a licensed spectrum when the base station sends the notification message used to instruct to execute the random access procedure to the UE. Specifically, the notification message may be sent to the UE by using a primary cell, or be sent to the UE by using a secondary cell. The receiving module 40 of the UE may receive the notification message sent by the base station by using the primary cell or the secondary cell, where the foregoing primary cell or secondary cell may be pre-configured in a protocol, or may be configured by using another message, which is not limited herein. In specific implementation, for a specific implementation process in which the foregoing receiving module receives the notification message sent by the base station, refer to step S201 in a first embodiment of a random access method provided in an embodiment of the present invention, and details are not described herein again.

[0050] In some feasible implementation manners, the foregoing processing module 50 is specifically configured to:

determine, according to the information that is about the PRACH resource and that is in the notification message, a location of the PRACH resource used to execute the random access procedure; and

the sending module 30 is configured to send, at the determined location of the PRACH resource, the random access code carried in the notification message to the base station.



[0051] In some feasible implementation manners, the notification message received by the receiving module 40 further includes at least one of: a listening parameter that is used to listen on the unlicensed spectrum before the UE sends the random access code to the base station, or a validity time for sending the random access code by the UE, where
the listening parameter includes at least one of a listening time, a backoff time, a power threshold, or an energy threshold.

[0052] The processing module 50 is further configured to:

listen to, according to the listening parameter, whether the determined PRACH resource configured on the unlicensed spectrum is idle, or listen to, according to the listening parameter, whether the determined unlicensed spectrum is idle; and

if it is detected, by means of listening, that the PRACH resource is idle or the unlicensed spectrum is idle, instruct the sending module 30 to send the random access code to the base station on the PRACH resource during the validity time for sending the random access code, or instruct the sending module 30 to send the random access code to the base station on the PRACH resource during the validity time for sending the random access code and after backoff is randomly performed for a specified time according to the backoff time.



[0053] In some feasible implementation manners, after the receiving module 40 of the UE receives the notification message sent by the base station, the processing module 50 may determine, according to the configuration parameter carried in the notification message received by the receiving module 40, the PRACH resource used to execute the random access procedure. Specifically, the configuration parameter carried in the notification message received by the foregoing receiving module 40 may include the random access code used by the foregoing UE to execute the random access procedure, the PRACH resource used by the foregoing UE to execute the random access procedure, and the like; the PRACH resource carried in the foregoing notification message is the PRACH resource that is configured on the unlicensed spectrum and that is obtained by the base station, and is the available PRACH resource determined by the base station. However, because of an inconsistency between a location of the base station and a location of the UE, the UE may be in a moving state. Therefore, after the base station determines the available PRACH resource and notifies the UE of the available PRACH resource by using the notification message, if the UE is in the moving state, the PRACH resource sent by the foregoing base station may be unavailable in a current location of the UE when the UE executes the random access procedure according to the notification message sent by the base station; after the UE receives, by using the receiving module 40, the notification message sent by the base station and obtains the available PRACH resource, the processing module 50 may further determine a location of a specific to-be-used PRACH resource in the foregoing available PRACH resource according to an actual location of the UE. Specifically, the base station may send, by using the foregoing notification message, the listening parameter that is used to listen to the PRACH resource before the UE sends the random access code to the base station to the UE when the UE executes the random access procedure. After receiving the notification message sent by the foregoing base station, the receiving module 40 of the UE may obtain, from the foregoing notification message, the listening parameter that is used to listen to the PRACH resource. The PRACH resource listened to by the foregoing UE is the PRACH resource configured on the unlicensed spectrum; that is, the UE may listen to, by using the processing module 50, the PRACH resource sent by the base station to the UE by using the notification message, and determine the specific available PRACH resource. The foregoing listening parameter may include the listening time, the backoff time, the power threshold, the energy threshold, and the like. In specific implementation, the notification message that is sent by the base station and that is received by the receiving module 40 of the foregoing UE may further carry the validity time for sending the random access code by the UE; that is, the sending module 30 of the UE may send the random access code to the base station on the determined available PRACH resource during the foregoing validity time. Specifically, after determining, according to the notification message sent by the base station, the PRACH resource used by the UE to execute the random access procedure, the processing module 50 of the UE may listen to the foregoing PRACH resource according to the foregoing listening parameter, that is, listen to whether the PRACH resource configured on the foregoing unlicensed spectrum is idle, or listen to, according to the listening parameter, whether the determined unlicensed spectrum is idle, and if the processing module 50 detects, by means of listening, that the PRACH resource is idle or the unlicensed spectrum is idle, the sending module 30 may send the random access code to the base station on the foregoing determined PRACH resource during the foregoing validity time for sending the random access code. In specific implementation, after the processing module 50 of the UE listens to, according to the foregoing listening parameter, the PRACH resource configured on the unlicensed spectrum and determines the available PRACH resource, the sending module 30 may further send, after the random backoff time (that is, the specified time) according to the backoff time in the foregoing listening parameter, the random access code to the base station on the foregoing available PRACH resource, where the foregoing random access code is the random access code carried in the notification message.

[0054] In some feasible implementation manners, the foregoing receiving module 40 is specifically configured to:

determine a value of a random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource; and

decode, by using the RA-RNTI in a random access response receiving window, a scheduling command corresponding to the random access response message, and decode the random access response message according to the scheduling command.



[0055] In some feasible implementation manners, after the sending module 30 of the UE sends the random access code to the base station, the receiving module 40 may receive, in the random access response receiving window configured by the base station, the random access response message sent by the base station, where the foregoing random access response receiving window may be learned from the notification message received by the receiving module 40, that is, the notification message that is sent by the base station to the UE and that is received by the foregoing receiving module 40 may carry the random access response receiving window configured by the base station. In specific implementation, the scheduling command corresponding to the random access response message sent by the base station to the UE may be scrambled by using the RA-RNTI. Before receiving the foregoing random access response message, the receiving module 40 of the UE further needs to determine the value of the foregoing RA-RNTI. Specifically, the value of the foregoing RA-RNTI may be fixed in the protocol, or may be determined according to a time domain location and a frequency domain location that are of the PRACH resource actually used by the UE, or be determined by using the notification message sent by the base station; that is, the base station may notify the UE of the value of the foregoing RA-RNTI by using the foregoing notification message, and after receiving the notification message sent by the base station, the receiving module 40 of the UE may determine the value of the random access radio network temporary identifier RA-RNTI according to the protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource. After determining the value of the foregoing RA-RNTI, the receiving module 40 of the UE may decode, in the random access response receiving window by using the foregoing RA-RNTI, the scheduling command corresponding to the foregoing random access response message, and decode the random access response message according to the foregoing scheduling command, so as to obtain the random access response message sent by the base station. In specific implementation, a start location of the foregoing random access response receiving window may be an Nth subframe after the UE sends the random access code, or may be an Nth subframe after the specified time, that is, the start location of the foregoing random access response receiving window may be fixed in the protocol as the Nth subframe after the UE sends the random access code, and the start location of the random access response receiving window is notified to the UE by using the foregoing notification message, where N may be a non-zero natural number. In this way, no matter when the UE executes the random access procedure (sending the random access code to the base station), the random access response receiving window may start from the Nth subframe after the UE sends the random access code, or start from the Nth subframe after the specified time, which does not cause ambiguity, and may better implement the random access procedure on the unlicensed spectrum. In specific implementation, for a specific implementation process in which the foregoing processing module and sending module send the random access code to the base station according to the notification message sent by the base station, the foregoing processing module and receiving module receive, according to the notification message sent by the base station, the random access response message sent by the base station, refer to steps S202 to S205 in the first embodiment of the random access method provided in the embodiment of the present invention, and details are not described herein again.

[0056] The UE described in this embodiment of the present invention may receive a notification message sent by a base station, where the foregoing notification message carries a random access code used by the UE to execute a random access procedure and a PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure. The UE may listen to, according to a listening parameter that is set in the notification message, the PRACH resource that is configured on the unlicensed spectrum and that is sent by the base station, determine, according to the foregoing notification message, a PRACH resource used by the UE to execute the random access procedure, send the random access code to the base station on the resource, and further receive, in a random access response receiving window configured by the base station, a random access response message sent by the base station, which implements that the random access procedure is executed on the unlicensed spectrum, reduces a probability of a collision in the random access procedure on the unlicensed spectrum, and enhances user experience of the random access procedure on the unlicensed spectrum.

[0057] Referring to FIG. 5, FIG. 5 is a schematic flowchart of a first embodiment of a random access method according to an embodiment of the present invention. The random access method described in this embodiment includes the following steps:

S101. User equipment UE receives a notification message sent by a base station.



[0058] In specific implementation, because a contention and a collision may exist on an unlicensed spectrum resource, before instructing the UE to execute a random access procedure, the base station cannot determine a location of a specific available PRACH resource when the UE executes the random access procedure. Therefore, the base station cannot send the available PRACH resource to the UE by using system broadcast information, and the base station can instruct, only when the UE is required to execute the random access procedure and by using the notification message, the UE to execute the random access procedure and notify the UE of the available PRACH resource by using the notification message.

[0059] In some feasible implementation manners, when the UE is required by the base station to execute the random access procedure on an unlicensed spectrum, the base station may instruct, by sending the notification message to the UE, the UE to execute the random access procedure, and the UE may receive the notification message sent by the base station, and execute the random access procedure according to the foregoing notification message. Specifically, the foregoing notification message may carry a random access code used by the UE to execute the random access procedure or information about a PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure. In specific implementation, the foregoing notification message may be specifically a radio resource control (Radio Resource Control, RRC) message, a media access control (Media Access Control, MAC) message, or a physical layer (Physical Layer, PHY) message. Specifically, the random access code carried in the foregoing notification message may be a dedicated random access code, or may be information used to instruct the UE to randomly select a random access code. The information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the foregoing UE to execute the random access procedure may include a frequency domain location of the foregoing PRACH resource, a time domain location of the foregoing PRACH resource, or the like, for example, a specific PRACH resource, or a subframe that is in a time domain and in which the PRACH resource exists. The foregoing time domain information may be an absolute frame number and an absolute subframe number, or a subframe offset (for example, a sixth subframe behind a subframe of the foregoing notification message) relative to the foregoing notification message. This embodiment of the present invention imposes no limitation on the frequency domain location or the time domain location of the PRACH resource. That is, when instructing, by sending the notification message to the UE, the UE to execute the random access procedure, the base station may notify the UE of an obtained specific location of the available PRACH resource, and may further send, to the UE, the random access code used by the UE to execute the random access. The UE may determine, according to the PRACH resource notified in the notification message, a PRACH resource used to execute the random access procedure, and send the random access code to the base station on the foregoing determined PRACH resource.

[0060] In some feasible implementation manners, the notification message may be sent to the UE by using a cell operating on a licensed spectrum when the base station sends the notification message used to instruct to execute the random access procedure to the UE. Specifically, the notification message may be sent to the UE by using a primary cell, or be sent to the UE by using a secondary cell. The UE may obtain, by using the foregoing primary cell or secondary cell, the notification message sent by the base station, where the foregoing primary cell or secondary cell may be pre-configured in a protocol, or may be configured by using another message, which is not limited herein.

[0061] S102. The UE determines, according to a configuration parameter in the notification message, a PRACH resource used to execute a random access procedure, and sends a random access code to the base station on the PRACH resource.

[0062] S103. The UE receives a random access response message sent by the base station, and determines, according to the random access response message, that the random access procedure is successfully completed.

[0063] In some feasible implementation manners, after receiving the notification message sent by the base station, the UE may determine, according to the configuration parameter carried in the notification message, the PRACH resource used to execute the random access procedure. Specifically, the configuration parameter carried in the foregoing notification message may include the random access code used by the foregoing UE to execute the random access procedure, the PRACH resource used by the foregoing UE to execute the random access procedure, and the like; the PRACH resource carried in the foregoing notification message is the PRACH resource that is configured on the unlicensed spectrum and that is obtained by the base station, and is the available PRACH resource determined by the base station. However, because of an inconsistency between a location of the base station and a location of the UE, the UE may be in a moving state. Therefore, after the base station determines the available PRACH resource and notifies the UE of the available PRACH resource by using the notification message, if the UE is in the moving state, the PRACH resource sent by the foregoing base station may be unavailable in a current location of the UE when the UE executes the random access procedure according to the notification message sent by the base station; after receiving the notification message sent by the base station and obtaining the available PRACH resource, the UE may further determine a location of a specific to-be-used PRACH resource in the foregoing available PRACH resource according to an actual location of the UE. That is, the UE may determine, according to the information that is about the PRACH resource and that is carried in the foregoing notification message, the location of the available PRACH resource, that is, the location of the available PRACH resource in the current location of the UE. After determining the location of the specific available PRACH resource, the UE may send the random access code to the base station at the location of the foregoing PRACH resource, where the foregoing random access code is the random access code carried in the notification message.

[0064] In some feasible implementation manners, after sending the random access code to the base station, the UE may receive, in a random access response receiving window configured by the base station, the random access response message sent by the base station, where the foregoing random access response receiving window may be notified to the UE by using the notification message sent to the UE, that is, the notification message sent by the foregoing base station to the UE may carry the random access response receiving window configured by the base station. In specific implementation, a scheduling command corresponding to the random access response message sent by the base station to the UE may be scrambled by using a random access radio network temporary identifier (RA-RNTT). Before receiving the foregoing random access response message, the UE further needs to determine a value of the foregoing RA-RNTI. Specifically, the value of the foregoing RA-RNTI may be fixed in the protocol, or may be determined according to a time domain location and a frequency domain location that are of the PRACH resource actually used by the UE, or be determined by using the notification message sent by the base station; that is, the base station may notify the UE of the value of the foregoing RA-RNTI by using the foregoing notification message, and the UE may determine the value of the random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource. After determining the value of the foregoing RA-RNTI, the UE may decode, in the random access response receiving window by using the foregoing RA-RNTI, the scheduling command corresponding to the foregoing random access response message, and decode the random access response message according to the foregoing scheduling command, so as to obtain the random access response message sent by the base station. In specific implementation, a start location of the foregoing random access response receiving window may be an Nth subframe after the UE sends the random access code, or may be an Nth subframe after a specified time, that is, the start location of the foregoing random access response receiving window may be fixed in the protocol as the Nth subframe after the UE sends the random access code, and the start location of the random access response receiving window is notified to the UE by using the foregoing notification message, where N may be a non-zero natural number. In this way, no matter when the UE executes the random access procedure (sending the random access code to the base station), the random access response receiving window may start from the Nth subframe after the UE sends the random access code, or start from the Nth subframe after the specified time, which does not cause ambiguity, and may better implement the random access procedure on the unlicensed spectrum.

[0065] In this embodiment of the present invention, the UE may receive a notification message sent by a base station, where the foregoing notification message carries a random access code used by the UE to execute a random access procedure and a PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure. The UE may determine, according to the foregoing notification message, a PRACH resource used by the UE to execute the random access procedure, send the random access code to the base station on the resource, and further receive, in a random access response receiving window configured by the base station, a random access response message sent by the base station, which implements that the random access procedure is executed on the unlicensed spectrum, reduces a probability of a collision in the random access procedure on the unlicensed spectrum, and enhances user experience of the random access procedure on the unlicensed spectrum.

[0066] Referring to FIG. 6, FIG. 6 is a schematic flowchart of a second embodiment of a random access method according to an embodiment of the present invention. The random access method described in this embodiment includes the following steps:

S201. User equipment UE receives a notification message sent by a base station.



[0067] In specific implementation, because a contention and a collision may exist on an unlicensed spectrum resource, before instructing the UE to execute a random access procedure, the base station cannot determine a location of a specific available PRACH resource when the UE executes the random access procedure. Therefore, the base station cannot send the available PRACH resource to the UE by using system broadcast information, and the base station can instruct, only when the UE is required to execute the random access procedure and by using the notification message, the UE to execute the random access procedure and notify the UE of the available PRACH resource by using the notification message.

[0068] In some feasible implementation manners, when the UE is required by the base station to execute the random access procedure on an unlicensed spectrum, the base station may instruct, by sending the notification message to the UE, the UE to execute the random access procedure, and the UE may receive the notification message sent by the base station, and execute the random access procedure according to the foregoing notification message. Specifically, the foregoing notification message may carry a random access code used by the UE to execute the random access procedure or information about a PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure. In specific implementation, the foregoing notification message may be specifically an RRC message, an MAC message, or a PHY message. Specifically, the random access code carried in the foregoing notification message may be a dedicated random access code, or may be information used to instruct the UE to randomly select a random access code. The information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the foregoing UE to execute the random access procedure may include a frequency domain location of the foregoing PRACH resource, a time domain location of the foregoing PRACH resource, or the like, for example, a specific PRACH resource, or a subframe that is in a time domain and in which the PRACH resource exists. The foregoing time domain information may be an absolute frame number and an absolute subframe number, or a subframe offset (for example, a sixth subframe behind a subframe of the foregoing notification message) relative to the foregoing notification message. This embodiment of the present invention imposes no limitation on the frequency domain location or the time domain location of the PRACH resource. That is, when instructing, by sending the notification message to the UE, the UE to execute the random access procedure, the base station may notify the UE of an obtained specific location of the available PRACH resource, and may further send, to the UE, the random access code used by the UE to execute the random access. The UE may determine, according to the PRACH resource notified in the notification message, a PRACH resource used to execute the random access procedure, and send the random access code to the base station on the foregoing determined PRACH resource.

[0069] In some feasible implementation manners, the notification message may be sent to the UE by using a cell operating on a licensed spectrum when the base station sends the notification message used to instruct to execute the random access procedure to the UE. Specifically, the notification message may be sent to the UE by using a primary cell, or be sent to the UE by using a secondary cell. The UE may obtain, by using the foregoing primary cell or secondary cell, the notification message sent by the base station, where the foregoing primary cell or secondary cell may be pre-configured in a protocol, or may be configured by using another message, which is not limited herein.

[0070] S202. The UE determines, according to information that is about the PRACH resource and that is in the notification message, a location of a PRACH resource used to execute a random access procedure.

[0071] S203. The UE listens to, according to the listening parameter, whether the determined PRACH resource configured on the unlicensed spectrum is idle, or the UE listens to, according to the listening parameter, whether the determined unlicensed spectrum is idle.

[0072] S204. If it is detected, by means of listening, that the PRACH resource is idle or the unlicensed spectrum is idle, send, at the determined location of the PRACH resource, a random access code carried in the notification message to the base station.

[0073] S205. The UE receives a random access response message sent by the base station, and determines, according to the random access response message, that the random access procedure is successfully completed.

[0074] In some feasible implementation manners, after receiving the notification message sent by the base station, the UE may determine, according to a configuration parameter carried in the notification message, the PRACH resource used to execute the random access procedure. Specifically, the configuration parameter carried in the foregoing notification message may include the random access code used by the foregoing UE to execute the random access procedure, the PRACH resource used by the foregoing UE to execute the random access procedure, and the like; the PRACH resource carried in the foregoing notification message is the PRACH resource that is configured on the unlicensed spectrum and that is obtained by the base station, and is the available PRACH resource determined by the base station. However, because of an inconsistency between a location of the base station and a location of the UE, the UE may be in a moving state. Therefore, after the base station determines the available PRACH resource and notifies the UE of the available PRACH resource by using the notification message, if the UE is in the moving state, the PRACH resource sent by the foregoing base station may be unavailable in a current location of the UE when the UE executes the random access procedure according to the notification message sent by the base station; after receiving the notification message sent by the base station and obtaining the available PRACH resource, the UE may further determine a location of a specific to-be-used PRACH resource in the foregoing available PRACH resource according to an actual location of the UE. Specifically, the base station may send, by using the foregoing notification message, the listening parameter that is used to listen to the PRACH resource before the UE sends the random access code to the base station to the UE when the UE executes the random access procedure. The PRACH resource listened to by the foregoing UE is the PRACH resource configured on the unlicensed spectrum; that is, the UE may listen to the PRACH resource sent by the base station to the UE by using the notification message, and determine the specific available PRACH resource. The foregoing listening parameter may include a listening time, a backoff time, a power threshold, an energy threshold, and the like. In specific implementation, the notification message sent by the base station to the UE may further carry a validity time for sending the random access code by the UE; that is, the UE may send the random access code to the base station on the determined available PRACH resource during the foregoing validity time. Specifically, after determining, according to the notification message sent by the base station, the PRACH resource used by the UE to execute the random access procedure, the UE may listen to the foregoing PRACH resource according to the foregoing listening parameter, that is, listen to whether the PRACH resource configured on the foregoing unlicensed spectrum is idle, or the UE listens to, according to the listening parameter, whether the determined unlicensed spectrum is idle, and if it is detected, by means of listening, that the foregoing PRACH resource is idle or the unlicensed spectrum is idle, the UE may send the random access code to the base station on the foregoing determined PRACH resource during the foregoing validity time for sending the random access code. In specific implementation, after listening to, according to the foregoing listening parameter, the PRACH resource configured on the unlicensed spectrum and determining the available PRACH resource, the UE may further send, after a random backoff time (that is, a specified time) according to the backoff time in the foregoing listening parameter, the random access code to the base station on the foregoing available PRACH resource, where the foregoing random access code is the random access code carried in the notification message.

[0075] In some feasible implementation manners, after sending the random access code to the base station, the UE may receive, in a random access response receiving window configured by the base station, the random access response message sent by the base station, where the foregoing random access response receiving window may be notified to the UE by using the notification message sent to the UE, that is, the notification message sent by the foregoing base station to the UE may carry the random access response receiving window configured by the base station. In specific implementation, a scheduling command corresponding to the random access response message sent by the base station to the UE may be scrambled by using an RA-RNTI. Before receiving the foregoing random access response message, the UE further needs to determine a value of the foregoing RA-RNTI. Specifically, the value of the foregoing RA-RNTI may be fixed in the protocol, or may be determined according to a time domain location and a frequency domain location that are of the PRACH resource actually used by the UE, or be determined by using the notification message sent by the base station; that is, the base station may notify the UE of the value of the foregoing RA-RNTI by using the foregoing notification message, and the UE may determine the value of the random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource. After determining the value of the foregoing RA-RNTI, the UE may decode, in the random access response receiving window by using the foregoing RA-RNTI, the scheduling command corresponding to the foregoing random access response message, and decode the random access response message according to the foregoing scheduling command, so as to obtain the random access response message sent by the base station. In specific implementation, a start location of the foregoing random access response receiving window may be an Nth subframe after the UE sends the random access code, or may be an Nth subframe after the specified time, that is, the start location of the foregoing random access response receiving window may be fixed in the protocol as the Nth subframe after the UE sends the random access code, and the start location of the random access response receiving window is notified to the UE by using the foregoing notification message, where N may be a non-zero natural number. In this way, no matter when the UE executes the random access procedure (sending the random access code to the base station), the random access response receiving window may start from the Nth subframe after the UE sends the random access code, or start from the Nth subframe after the specified time, which does not cause ambiguity, and may better implement the random access procedure on the unlicensed spectrum.

[0076] In this embodiment of the present invention, the UE may receive a notification message sent by a base station, where the foregoing notification message carries a random access code used by the UE to execute a random access procedure and a PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure. The UE may listen to, according to a listening parameter that is set in the notification message, the PRACH resource that is configured on the unlicensed spectrum and that is sent by the base station, determine, according to the foregoing notification message, a PRACH resource used by the UE to execute the random access procedure, send the random access code to the base station on the resource, and further receive, in a random access response receiving window configured by the base station, a random access response message sent by the base station, which implements that the random access procedure is executed on the unlicensed spectrum, reduces a probability of a collision in the random access procedure on the unlicensed spectrum, and enhances user experience of the random access procedure on the unlicensed spectrum.

[0077] A person of ordinary skill in the art may understand that all or a part of the processes of the methods in the embodiments may be implemented by a computer program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program runs, the processes of the methods in the embodiments are performed. The foregoing storage medium may include: a magnetic disk, an optical disc, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM).

[0078] What is disclosed above is merely exemplary embodiments of the present invention, and certainly is not intended to limit the protection scope of the present invention. Therefore, equivalent variations made within the scope of the claims of the present invention shall fall within the scope of the present invention.


Claims

1. Random access user equipment, comprising:

a receiving module (40), configured to receive a notification message sent by a base station, wherein the notification message is used to instruct the user equipment, UE, to execute a random access procedure, and the notification message carries the following configuration parameters: a random access code used by the UE to execute the random access procedure, and information about a physical random access channel, PRACH, resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure, wherein the notification message further comprises a listening parameter that is used to listen on the unlicensed spectrum before the UE sends the random access code to the base station, wherein the listening parameter comprises at least one of a listening time, a backoff time, a power threshold, or an energy threshold;

a processing module (50), configured to determine, according to the configuration parameter in the notification message received by the receiving module, a PRACH resource used to execute the random access procedure; and

a sending module (30), configured to send the random access code to the base station on the PRACH resource determined by the processing module; wherein

the receiving module is configured to receive a random access response message sent by the base station, and determine, according to the random access response message, that the random access procedure is successfully completed.


 
2. The user equipment according to claim 1, wherein the notification message received by the receiving module may be specifically a radio resource control, RRC, message, a media access control, MAC, message, or a physical layer, PHY, message.
 
3. The user equipment according to claim 1, wherein the random access code that is used by the UE to execute the random access procedure and that is carried in the notification message received by the receiving module is specifically a dedicated random access code, or information used to instruct the UE to randomly select a random access code.
 
4. The user equipment according to claim 1, wherein the information that is about the PRACH resource and that is carried in the notification message received by the receiving module comprises a frequency domain location of the PRACH resource or a time domain location of the PRACH resource, wherein the PRACH resource is configured on the unlicensed spectrum and is used by the UE to execute the random access procedure.
 
5. The user equipment according to claim 4, wherein the receiving module is specifically configured to:

determine a value of a random access radio network temporary identifier RA-RNTI according to protocol pre-configuration or a time domain location and a frequency domain location that are of the PRACH resource; and

decode, by using the RA-RNTI in a random access response receiving window, a scheduling command corresponding to the random access response message, and decode the random access response message according to the scheduling command.


 
6. The user equipment according to claim 5, wherein a start location of the random access response receiving window is specifically an Nth subframe after the UE sends the random access code; or
a start location of the random access response receiving window is specifically an Nth subframe after the specified validity time; wherein
N is a non-zero natural number.
 
7. A random access method, comprising:

receiving, by user equipment, UE, a notification message sent by a base station, wherein the notification message is used to instruct the UE to execute a random access procedure, and the notification message carries the following configuration parameters: a random access code used by the UE to execute the random access procedure, and information about a physical random access channel, PRACH resource that is configured on an unlicensed spectrum and that is used by the UE to execute the random access procedure, wherein the notification message further comprises a listening parameter that is used to listen on the unlicensed spectrum before the UE sends the random access code to the base station, wherein the listening parameter comprises at least one of a listening time, a backoff time, a power threshold, or an energy threshold (S201);

determining, by the UE according to the configuration parameter in the notification message, a PRACH resource used to execute the random access procedure, and sending the random access code to the base station on the PRACH resource (S204); and

receiving, by the UE, a random access response message sent by the base station, and determining, according to the random access response message, that the random access procedure is successfully completed (S205).


 
8. The method according to claim 7, wherein the notification message may be specifically a radio resource control RRC message, a media access control, MAC, message, or a physical layer,
 
9. The method according to claim 7, wherein the random access code used by the UE to execute the random access procedure is specifically a dedicated random access code, or information used to instruct the UE to randomly select a random access code.
 
10. The method according to claim 7, wherein the information about the PRACH resource that is configured on the unlicensed spectrum and that is used by the UE to execute the random access procedure comprises a frequency domain location of the PRACH resource or a time domain location of the PRACH resource.
 


Ansprüche

1. Direktzugriff-Benutzer-Equipment, umfassend:

ein Empfangsmodul (40), das dafür ausgelegt ist, eine Benachrichtigungsnachricht, die von einer Basisstation gesendet wird, zu empfangen,

wobei die Benachrichtigungsnachricht dazu verwendet wird, das Benutzer-Equipment ("User Equipment", UE), anzuweisen, eine Direktzugriffprozedur auszuführen, und die Benachrichtigungsnachricht die folgenden Konfigurationsparameter trägt: einen Direktzugriffcode, der vom UE verwendet wird, um die Direktzugriffprozedur auszuführen, und Informationen zu einer Ressource des physikalischen Direktzugriffkanals ("Physical Random Access Channel", PRACH), die auf einem nichtlizenzierten Spektrum konfiguriert ist und vom UE genutzt wird, um die Direktzugriffprozedur auszuführen, wobei die Benachrichtigungsnachricht ferner einen Horchparameter umfasst, der verwendet wird, um in das nichtlizenzierte Spektrum zu horchen, ehe das UE den Direktzugriffcode an die Basisstation sendet, wobei der Horchparameter eine Horchzeit und/oder eine Verzichtsdauer ("Backoff Time") und/oder einen Leistungsschwellwert und/oder einen Energieschwellwert umfasst;

ein Verarbeitungsmodul (50), das ausgelegt ist zum Bestimmen, gemäß dem Konfigurationsparameter in der Benachrichtigungsnachricht, die durch das Empfangsmodul empfangen wird, einer PRACH-Ressource, die verwendet wird, um die Direktzugriffprozedur auszuführen; und

ein Sendemodul (30), das ausgelegt ist zum Senden des Direktzugriffcodes an die Basisstation auf der PRACH-Ressource, die vom Verarbeitungsmodul bestimmt wurde; wobei

das Empfangsmodul ausgelegt ist zum Empfangen einer Direktzugriff-Antwortnachricht, die von der Basisstation gesendet wird, und zum Bestimmen, gemäß der Direktzugriff-Antwortnachricht, dass die Direktzugriffprozedur erfolgreich abgeschlossen ist.


 
2. Benutzer-Equipment gemäß Anspruch 1, wobei die Benachrichtigungsnachricht, die durch das Empfangsmodul empfangen wird, speziell eine Funkressourcenkontroll("Radio Resource Control", RRC)-Nachricht, eine Medienzugriffkontroll("Media Access Control", MAC)-Nachricht oder eine Nachricht auf der physikalischen Schicht, PHY, sein kann.
 
3. Benutzer-Equipment gemäß Anspruch 1, wobei der Direktzugriffcode, der vom UE verwendet wird, um die Direktzugriffprozedur auszuführen, und der in der Benachrichtigungsnachricht getragen wird, die durch das Empfangsmodul empfangen wird, speziell ein dedizierter Direktzugriffcode oder Informationen, die dazu verwendet werden, das UE anzuweisen, einen Direktzugriffcode willkürlich zu wählen, ist.
 
4. Benutzer-Equipment gemäß Anspruch 1, wobei die Informationen, die die PRACH-Ressource betreffen und die in der Benachrichtigungsnachricht getragen werden, welche vom Empfangsmodul empfangen wird, einen Ort der PRACH-Ressource in der Frequenzdomäne oder einen Ort der PRACH-Ressource in der Zeitdomäne umfassen, wobei die PRACH-Ressource im nichtlizenzierten Spektrum konfiguriert ist und vom UE verwendet wird, um die Direktzugriffprozedur auszuführen.
 
5. Benutzer-Equipment gemäß Anspruch 4, wobei das Empfangsmodul speziell ausgelegt ist zum:

Bestimmen eines Werts einer temporären Kennung eines Direktzugriffnetzes ("Random Access Radio Network Temporary Identifier", RA-RNTI), gemäß einer Protokollvorkonfiguration oder eines Ortes in der Zeitdomäne und eines Ortes in der Frequenzdomäne, die zur PRACH-Ressource gehören; und

Decodieren, unter Verwendung der RA-RNTI in einem Fenster zum Empfangen der Direktzugriffantwort, eines Zeitplanungs("Scheduling")-Befehls entsprechend der Direktzugriff-Antwortnachricht, und Decodieren der Direktzugriff-Antwortnachricht gemäß dem Zeitplanungsbefehl.


 
6. Benutzer-Equipment gemäß Anspruch 5, wobei eine Startposition des Fensters zum Empfangen der Direktzugriff-Antwort speziell ein N-ter Unterrahmen nach dem Senden des Direktzugriffcodes durch das UE ist; oder
eine Startposition des Fensters zum Empfangen der Direktzugriff-Antwort speziell ein N-ter Unterrahmen nach der spezifizierten Gültigkeitsdauer ist; wobei N eine natürliche Zahl ungleich Null ist.
 
7. Direktzugriffverfahren, umfassend:

Empfangen, durch das Benutzer-Equipment (UE), einer Benachrichtigungsnachricht, die von einer Basisstation gesendet wird, wobei die Benachrichtigungsnachricht verwendet wird, das UE anzuweisen, eine Direktzugriffprozedur auszuführen, und die Benachrichtigungsnachricht die folgenden Konfigurationsparameter trägt: einen Direktzugriffcode, der vom UE verwendet wird, um die Direktzugriffprozedur auszuführen, und Informationen zu einer Ressource des physikalischen Direktzugriffkanals ("Physical Random Access Channel", PRACH), die auf einem nichtlizenzierten Spektrum konfiguriert ist und vom UE genutzt wird, um die Direktzugriffprozedur auszuführen, wobei die Benachrichtigungsnachricht ferner einen Horchparameter umfasst, der verwendet wird, um in das nichtlizenzierte Spektrum zu horchen, ehe das UE den Direktzugriffcode an die Basisstation sendet, wobei der Horchparameter eine Horchzeit und/oder eine Verzichtsdauer ("Backoff Time") und/oder einen Leistungsschwellwert und/oder einen Energieschwellwert umfasst (S201);

Bestimmen, durch das UE gemäß dem Konfigurationsparameter in der Benachrichtigungsnachricht, einer PRACH-Ressource, die verwendet wird, um die Direktzugriffprozedur auszuführen, und Senden des Direktzugriffcodes an die Basisstation auf der PRACH-Ressource (S204); und

Empfangen, durch das UE, einer Direktzugriff-Antwortnachricht, die von der Basisstation gesendet wird, und zum Bestimmen, gemäß der Direktzugriff-Antwortnachricht, dass die Direktzugriffprozedur erfolgreich abgeschlossen ist (S205).


 
8. Verfahren gemäß Anspruch 7, wobei die Benachrichtigungsnachricht speziell eine Funkressourcenkontroll("Radio Resource Control", RRC)-Nachricht, eine Medienzugriffkontroll ("Media Access Control", MAC)-Nachricht oder eine Nachricht auf der physikalischen Schicht sein kann.
 
9. Verfahren gemäß Anspruch 7, wobei der Direktzugriffcode, der vom UE verwendet wird, um die Direktzugriffprozedur auszuführen, speziell ein dedizierter Direktzugriffcode oder Informationen, die verwendet werden, das UE anzuweisen, einen Direktzugriffcode willkürlich zu wählen, ist.
 
10. Verfahren gemäß Anspruch 7, wobei die Informationen, die die PRACH-Ressource betreffen, die auf dem nichtlizenzierten Spektrum konfiguriert ist und vom UE genutzt wird, um die Direktzugriffprozedur auszuführen, einen Ort der PRACH-Ressource in der Frequenzdomäne oder einen Ort der PRACH-Ressource in der Zeitdomäne umfassen.
 


Revendications

1. Équipement utilisateur d'accès aléatoire, comprenant :

un module de réception (40), configuré pour recevoir un message de notification envoyé par une station de base, dans lequel le message de notification est utilisé pour donner instruction à l'équipement utilisateur, UE, d'exécuter une procédure d'accès aléatoire, et le message de notification achemine les paramètres de configuration suivants : un code d'accès aléatoire utilisé par l'UE en vue d'exécuter la procédure d'accès aléatoire, et des informations concernant une ressource d'un canal d'accès aléatoire physique, PRACH, qui sont configurées sur un spectre sans licence et qui sont utilisées par l'UE en vue d'exécuter la procédure d'accès aléatoire, dans lequel le message de notification comprend en outre un paramètre d'écoute qui est utilisé pour écouter sur le spectre sans licence avant que l'UE n'envoie le code d'accès aléatoire à la station de base, dans lequel le paramètre d'écoute comprend au moins un parmi un temps d'écoute, un temps de réduction de puissance, un seuil de puissance ou un seuil d'énergie ;

un module de traitement (50), configuré pour déterminer, en fonction du paramètre de configuration dans le message de notification reçu par le module de réception, une ressource PRACH utilisée pour exécuter la procédure d'accès aléatoire ; et

un module d'envoi (30), conçu pour envoyer le code d'accès aléatoire à la station de base sur la ressource PRACH déterminée par le module de traitement ; dans lequel

le module de réception est configuré pour recevoir un message de réponse d'accès aléatoire envoyé par la station de base, et déterminer, en fonction du message de réponse d'accès aléatoire, que la procédure d'accès aléatoire a été exécutée avec succès.


 
2. Équipement utilisateur selon la revendication 1, dans lequel le message de notification reçu par le module de réception peut être spécifiquement un message de contrôle de ressources radio, RRC, un message de contrôle d'accès au support, MAC, ou un message de couche physique, PHY.
 
3. Équipement utilisateur selon la revendication 1, dans lequel le code d'accès aléatoire qui est utilisé par l'UE pour exécuter la procédure d'accès aléatoire et qui est acheminé dans le message de notification reçu par le module de réception est spécifiquement un code d'accès aléatoire dédié, ou des informations utilisées pour donner instruction à l'UE de sélectionner de façon aléatoire un code d'accès aléatoire.
 
4. Équipement utilisateur selon la revendication 1, dans lequel les informations qui concernent la ressource PRACH et qui sont acheminées dans le message de notification reçu par le module de réception comprennent une localisation de domaine de fréquence de la ressource PRACH ou une localisation de domaine temporel de la ressource PRACH, dans lequel la ressource PRACH est configurée sur le spectre sans licence et est utilisée par l'UE pour exécuter la procédure d'accès aléatoire.
 
5. Équipement utilisateur selon la revendication 4, dans lequel le module de réception est configuré spécifiquement pour :

déterminer une valeur d'un identifiant temporaire de réseau radio d'accès aléatoire RA-RNTI en fonction d'une pré-configuration de protocole ou d'une localisation de domaine temporel et d'une localisation de domaine de fréquence qui viennent de la ressource PRACH ; et

décoder, à l'aide du RA-RNTI dans une fenêtre de réception de réponse d'accès aléatoire, une commande de programmation correspondant au message de réponse d'accès aléatoire, et décoder le message de réponse d'accès aléatoire en fonction de la commande de programmation.


 
6. Équipement utilisateur selon la revendication 5, dans lequel une localisation de début de la fenêtre de réception de réponse d'accès aléatoire est spécifiquement une Nème sous-trame après que l'UE envoie le code d'accès aléatoire ; ou
une localisation de début d'une fenêtre de réception de réponse d'accès aléatoire est spécifiquement une Nème sous-trame après le temps de validité spécifié ; dans lequel
N est un nombre naturel non nul.
 
7. Procédé d'accès aléatoire, comprenant les étapes consistant à :

recevoir, par un équipement utilisateur, UE, un message de notification envoyé par une station de base, dans lequel le message de notification est utilisé pour donner instruction à l'UE, d'exécuter une procédure d'accès aléatoire, et le message de notification achemine les paramètres de configuration suivants : un code d'accès aléatoire utilisé par l'UE en vue d'exécuter la procédure d'accès aléatoire, et des informations concernant une ressource d'un canal d'accès aléatoire physique, PRACH, qui sont configurées sur un spectre sans licence et qui sont utilisées par l'UE en vue d'exécuter la procédure d'accès aléatoire, dans lequel le message de notification comprend en outre un paramètre d'écoute qui est utilisé pour écouter sur le spectre sans licence avant que l'UE n'envoie le code d'accès aléatoire à la station de base, dans lequel le paramètre d'écoute comprend au moins un parmi un temps d'écoute, un temps de réduction de puissance, un seuil de puissance ou un seuil d'énergie (S201) ;

déterminer, par l'UE en fonction du paramètre de configuration dans le message de notification, une ressource PRACH utilisée pour exécuter la procédure d'accès aléatoire ; et envoyer le code d'accès aléatoire à la station de base sur la ressource PRACH (S204) ; et

recevoir, par l'UE, un message de réponse d'accès aléatoire envoyé par la station de base, et déterminer, en fonction du message de réponse d'accès aléatoire, que la procédure d'accès aléatoire est exécutée avec succès (S205).


 
8. Procédé selon la revendication 7, dans lequel le message de notification peut être spécifiquement un message de contrôle de ressources radio RRC, un message de contrôle d'accès au support, MAC, ou un message de couche physique, PHY.
 
9. Procédé selon la revendication 7, dans lequel le code d'accès aléatoire qui est utilisé par l'UE pour exécuter la procédure d'accès aléatoire est spécifiquement un code d'accès aléatoire dédié, ou des informations utilisées pour donner instruction à l'UE de sélectionner de façon aléatoire un code d'accès aléatoire.
 
10. Procédé selon la revendication 7, dans lequel les informations concernant la ressource PRACH qui sont configurées sur le spectre sans licence et qui sont utilisées par l'UE pour exécuter la procédure d'accès aléatoire comprennent une localisation de domaine de fréquence de la ressource PRACH ou une localisation de domaine temporel de la ressource PRACH.
 




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REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description