(19)
(11)EP 4 027 553 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
13.07.2022 Bulletin 2022/28

(21)Application number: 20860345.6

(22)Date of filing:  04.03.2020
(51)International Patent Classification (IPC): 
H04L 1/16(2006.01)
(52)Cooperative Patent Classification (CPC):
H04L 2001/125; H04L 1/1614; H04L 1/1887; H04L 1/1685; H04L 1/188; H04L 5/0055
(86)International application number:
PCT/CN2020/077691
(87)International publication number:
WO 2021/042686 (11.03.2021 Gazette  2021/10)
(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
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 06.09.2019 CN 201910842314

(71)Applicant: Spreadtrum Communications (Shanghai) Co., Ltd.
Shanghai 201203 (CN)

(72)Inventors:
  • XU, Yanchao
    Shanghai 201203 (CN)
  • JAUH, Yuhren
    Shanghai 201203 (CN)
  • YU, Chinghwa
    Shanghai 201203 (CN)

(74)Representative: Nordmeyer, Philipp Werner 
df-mp Dörries Frank-Molnia & Pohlman Patentanwälte Rechtsanwälte PartG mbB Theatinerstraße 16
80333 München
80333 München (DE)

  


(54)DATA RETRANSMISSION METHOD AND DEVICE, DATA RECEPTION RESPONSE METHOD AND DEVICE, AND STORAGE MEDIUM


(57) A data retransmission method and device, a data reception response method and device, and a storage medium. The data retransmission method comprises: receiving acknowledgement frames from a receiving end on transmission links, each acknowledgement frame comprising reception information of AMPDUs belonging to the same block acknowledgement session on all transmission links at a sending moment of the acknowledgement frame; if an acknowledgement frame is not successfully received on a first transmission link, detecting whether an acknowledgement frame is successfully received on other transmission links except the first transmission link, and determining whether to perform retransmission according to the reception information in the acknowledgement frame successfully received on other transmission links; and when the retransmission is determined, determining retransmission content according to the reception information in the acknowledgement frame successfully received on other transmission links, and retransmitting the retransmission content on any transmission link. According to the technical solution of the present invention, a retransmission mechanism of when a block acknowledgement frame of the same A-MPDU block acknowledgement session fails to be received under a multi-link system can be implemented, and the transmission efficiency is improved.




Description

CROSS-REFERENCE TO RELATED APPLICATIONS



[0001] This application claims the benefit of priority to Chinese Patent Application No. 201910842314.9, filed on September 6, 2019, and entitled "DATA RETRANSMISSION METHOD AND DEVICE, DATA RESPONSE METHOD AND DEVICE, AND STORAGE MEDIUM", the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD



[0002] The present disclosure generally relates to communication technology field, and more particularly, to data retransmission method and device, data response method and device, and a storage medium.

BACKGROUND



[0003] In conventional Wireless Fidelity (Wi-Fi) systems, there is only one Media Access Control (MAC) layer and one Port Physical Layer (PHY) (including Radio Frequency (RF)). For typical WiFi systems that support dual bands (2.4 GHz and 5 GHz), merely one RF is generally enabled to receive data. This is an example of a single-link Wireless Local Area Network (WLAN) system. With the advancement of a WLAN standard, features of multi-bands (2.4 GHz, 5 GHz and 60 GHz) or multi-links have been discussed in IEEE 802.11 be (EHT) and RTA TIG. Therefore, in practice, more and more WLAN products (e.g., products that support multi-band multi-parallel features) support multi-links.

[0004] A multi-link system architecture has been proposed in which MAC protocol data units (MPDUs) can be received using all allowed links, which is advantageous to reduce latency and better utilize each link dynamically, thereby improving MPDU exchange efficiency. Further, to improve peak throughput, MPDU packets under an Aggregated MPDU (A-MPDU) Block Acknowledgement (Ack) Agreement belonging to a same Traffic Identifier (TID) may be transmitted over any link. For A-MPDU Block Ack Agreement in the case of using an immediate Block Acknowledgement (BA), on either link, in a Short Inter-Frame Space (SIFS) after the end of AMPDU transmission, an acknowledgment frame reply is expected, to indicate a reception status of each sub-MPDU in the AMPDU.

[0005] Existing retransmission mechanisms and reply response BA frame mechanisms of A-MPDUs are based on the IEEE 802.11 standard protocol. In traditional IEEE 802.11, a receiver replies a BA frame merely based on the reception status of an A-MPDU received on a current link, and the BA frame carries merely reception information of MPDU on the current link. A transmitter, under an immediate BA agreement, waits to receive a corresponding BA frame within AckTimeout time after transmitting the A-MPDU, and if the corresponding BA frame is not received within the AckTimeout time, the corresponding A-MPDU needs to be retransmitted. Still in the traditional IEEE 802.11, the transmitter, under a delayed BA agreement, waits to receive a corresponding BA frame within AckTimeout time of transmitting a Block Ack Request (BAR) after transmitting the AMPDU, and if the corresponding BA frame is not received within the AckTimeout time, the corresponding BAR or A-MPDU needs to be retransmitted.

[0006] However, under a multi-link system, when the transmitter transmits A-MPDUs belonging to the same A-MPDU BlockAck Agreement on a plurality of links, the receiver replies a responded BA frame on any link, and the transmitter determines whether to perform retransmission merely based on whether the BA frame is correctly received on a single link. If actually the receiver correctly receives on a certain link all or part of the MPDUs, and the responded BA frame also carries the corresponding MPDU reception status, but the BA frame is not correctly received by the transmitter, the transmitter may determine that the whole A-MPDUs have not been successfully transmitted and then retransmits the whole A-MPDUs, which reduces data transmission efficiency.

SUMMARY



[0007] Embodiments of the present disclosure provide a retransmission mechanism specially for occurrence of receiving failure of a block acknowledgement frame under an A-MPDU block acknowledgement agreement in a multi-link system, which may improve transmission efficiency.

[0008] In an embodiment of the present disclosure, a data retransmission method is provided, including: receiving from a receiver acknowledgement frames on a plurality of links, wherein each of the acknowledgement frames includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; based on the acknowledgement frame being not successfully received on a first link, detecting whether the acknowledgement frame is successfully received on at least one other link, and determining whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, wherein the plurality of links include the first link and the at least one other link; and based on determining to retransmit, determining MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmitting the MPDUs to be retransmitted on any one of the plurality of links.

[0009] Optionally, detecting whether the acknowledgement frame is successfully received on at least one other link includes: detecting whether the acknowledgement frame is successfully received on the at least one other link at an acknowledgement timeout time of the first link; or detecting whether the acknowledgement frame is successfully received on the at least one other link at the time of a preset offset before the time when the first link accesses a channel next time.

[0010] Optionally, the preset offset includes a predetermined number of time slots.

[0011] Optionally, determining whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link includes: based on the reception information in the acknowledgement frame successfully received on the at least one other link indicating that the AMPDUs on the first link have been successfully received by the receiver, determining not to retransmit.

[0012] Optionally, the reception information indicates whether the AMPDUs have been received by the receiver, and determining MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link includes: determining the AMPDUs which have not been successfully received by the receiver, based on the reception information in the acknowledgement frame successfully received on the at least one other link, as the MPDUs to be retransmitted.

[0013] Optionally, the acknowledgement frame is a block acknowledgement frame under either an immediate BA agreement or a delayed BA agreement.

[0014] In an embodiment of the present disclosure, a data response method is provided, including: when acknowledgement frames need to be transmitted on a plurality of links, determining reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; and transmitting the acknowledgement frames on the plurality of links at the transmission time, wherein each of the acknowledgement frames includes the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and based on determining to retransmit, determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links include the first link and the at least one other link.

[0015] Optionally, the reception information includes a reception status which indicates that the AMPDUs are completely received on the plurality of links or a reception status which indicates that the AMPDUs are partially received on the plurality of links.

[0016] In an embodiment of the present disclosure, a data retransmission device is provided, including: an acknowledgement frame receiving circuitry configured to receive from a receiver acknowledgement frames on a plurality of links, wherein each of the acknowledgement frames includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; a detecting circuitry configured to: based on the acknowledgement frame being not successfully received on a first link, detect whether the acknowledgement frame is successfully received on at least one other link, and determine whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link; and a retransmitting circuitry configured to: based on determining retransmit, determine MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmit the MPDUs to be retransmitted on any one of the plurality of links.

[0017] In an embodiment of the present disclosure, a data response device is provided, including: a reception information determining circuitry configured to: when acknowledgement frames need to be transmitted on a plurality of links, determine reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; and an acknowledgement frame transmitting circuitry configured to transmit the acknowledgement frames on the plurality of links at the transmission time, wherein each of the acknowledgement frames includes the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and based on determining to retransmit, determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links include the first link and the at least one other link.

[0018] In an embodiment of the present disclosure, a storage medium having computer instructions stored therein is provided, wherein when the computer instructions are executed, the above data retransmission method or the above data response method is performed.

[0019] In an embodiment of the present disclosure, a device including a memory and a processor and applied in a transmitter is provided, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the above data retransmission method is performed.

[0020] In an embodiment of the present disclosure, a device including a memory and a processor and applied in a receiver is provided, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the above data response method is performed.

[0021] Embodiments of the present disclosure may provide following advantages. In embodiments of the present disclosure, the acknowledgement frame transmitted by the receiver includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on all the plurality of links. Therefore, based on the acknowledgement frame being not successfully received by the transmitter on the first link, whether to retransmit and the MPDUs to be retransmitted can be determined based on the reception information in the acknowledgement frames successfully received on the at least one other link, which ensures that the determined MPDUs to be retransmitted includes the AMPDUs needing to be retransmitted, thereby avoiding unnecessary data retransmission and improving transmission efficiency.

[0022] Further, whether the acknowledgement frame is successfully received on the at least one other link is determined at an acknowledgement timeout time of the first link, or at the time of a preset offset before the time when the first link accesses a channel next time. In embodiments of the present disclosure, the transmitter may determine whether the acknowledgement frame is successfully received on the at least one other link at a specific time point. The specific time point may be the acknowledgement timeout time of the first link, or the time of the preset offset before the time when the accesses the channel next time. In this way, the data retransmission mechanism is improved, and the MPDUs to be retransmitted is determined in time, which ensures timely retransmission and further improves the transmission efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS



[0023] 

Figure 1 is a flow chart of a data retransmission method according to an embodiment;

Figure 2 is an application scenario diagram according to an embodiment;

Figure 3 is an application scenario diagram according to an embodiment;

Figure 4 is a flow chart of a data response method according to an embodiment;

Figure 5 is an application scenario diagram according to an embodiment;

Figure 6 is a structural diagram of a data retransmission device according to an embodiment; and

Figure 7 is a structural diagram of a data response device according to an embodiment.


DETAILED DESCRIPTION



[0024] As described in the background, under a multi-link system, when the transmitter transmits A-MPDUs belonging to the same A-MPDU BlockAck Agreement on a plurality of links, the receiver replies a responded BA frame on any link, and the transmitter determines whether to perform retransmission merely based on whether the BA frame is correctly received on a single link. If actually the receiver correctly receives on a certain link all or part of the MPDUs, and the responded BA frame also carries the corresponding MPDU reception status, but the BA frame is not correctly received by the transmitter, the transmitter may determine that the whole A-MPDUs have not been successfully transmitted and then retransmits the whole A-MPDUs, which reduces data transmission efficiency.

[0025] In embodiments of the present disclosure, the acknowledgement frame transmitted by the receiver includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on all the plurality of links. Therefore, based on the acknowledgement frame being not successfully received by the transmitter on the first link, whether to retransmit and the MPDUs to be retransmitted can be determined based on the reception information in the acknowledgement frame successfully received on the at least one other link, which ensures that the determined MPDUs to be retransmitted includes the AMPDUs needing to be retransmitted, thereby avoiding unnecessary data retransmission and improving transmission efficiency.

[0026] In order to clarify the object, characteristic and advantages of embodiments of the present disclosure, embodiments of present disclosure will be described clearly in detail in conjunction with accompanying drawings.

[0027] Referring to Figure 1, Figure 1 is a flow chart of a data retransmission method according to an embodiment.

[0028] The data retransmission method may be applied in a transmitter, that is, steps of the method shown in Figure 1 may be performed by a device at the transmitter, such as a smart phone or a router.

[0029] The method includes S101, S102 and S103.

[0030] In S101, acknowledgement frames are received from a receiver on a plurality of links, wherein each of the acknowledgement frames includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links.

[0031] In S102, based on the acknowledgement frame being not successfully received on a first link, whether the acknowledgement frame is successfully received on at least one other link is detected, and whether to retransmit is determined based on the reception information in the acknowledgement frame successfully received on the at least one other link.

[0032] In S103, based on determining to retransmit, MPDUs to be retransmitted is determined based on the reception information in the acknowledgement frame successfully received on the at least one other link, and the MPDUs to be retransmitted are retransmitted on any one of the plurality of links.

[0033] It should be noted that serial numbers of the steps in the embodiment do not represent limitations on an execution order of the steps.

[0034] In some embodiments, the acknowledgment frame may be a Block Acknowledgement (BA) frame.

[0035] In some embodiments, the transmitter and the receiver may be a terminal equipment such as a mobile phone, a computer or a tablet computer, or may be a relay equipment such as a router.

[0036] The transmitter may transmit to the receiver the AMPDUs on the plurality of links, and the receiver may receive the AMPDUs on the plurality of links, and transmit the acknowledgement frames indicating whether the AMPDUs have been successfully received on each link. Each acknowledgement frame transmitted by the receiver includes reception information of the AMPDUs belonging to the same block acknowledgement agreement at the transmission time of the acknowledgement frames on all the plurality of links.

[0037] Referring to Figure 2, in a specific application scenario, the transmitter may transmit AMPDUs on a link Linkl and a link Link2. After the transmitter transmits the AMPDU1 including MPDUs with Sequence Numbers (SNs) of 1, 2 and 3 on the link Link1, the transmitter also transmits the AMPDU2 including MPDUs with sequence numbers of 4 and 5 on the link Link2. At the time T1, the receiver transmits on the link Link1 an acknowledgement frame BA1 which includes reception information of the MPDUs with the sequence numbers of 1, 2, 3, 4 and 5, i.e., including information of whether the MPDUs with the sequence numbers of 1, 2, 3, 4 and 5 have been successfully received. Similarly, the receiver transmits on the link Link2 an acknowledgement frame BA2 which includes reception information of the MPDUs with the sequence numbers of 1, 2, 3, 4, 5 and 6, i.e., including information of whether the MPDUs with the sequence numbers of 1, 2, 3, 4, 5 and 6 have been successfully received.

[0038] In some embodiments, in S101, the transmitter may receive the acknowledgement frame from the receiver on each of the plurlaiy of links. The acknowledgement frame on each link may be successfully received by the transmitter, or may not be successfully received by the transmitter.

[0039] In some embodiments, in S102, based on the transmitter not successfully receiving the acknowledgement frame on the first link, the transmitter may detect whether the acknowledgement frame is successfully received on at least one other link. Based on the acknowledgement frame being successfully received on at least one other link, whether to retransmit is determined based on the reception information in the acknowledgement frame successfully received on the at least one other link.

[0040] Based on the reception information in the acknowledgement frame successfully received on the at least one other link indicating that AMPDUs have not been successfully received by the receiver on the first link, it is determined that retransmission is required.

[0041] In some embodiments, in S103, when retransmission is determined, the MPDUs to be retransmitted are determined based on the reception information in the acknowledgement frame successfully received on the at least one other link. The MPDUs to be retransmitted may include the AMPDUs which have not been successfully received by the receiver on the first link.

[0042] The transmitter may retransmit the MPDUs to be retransmitted on any one of the plurality of links.

[0043] In some embodiments, S102 may include: based on the reception information in the acknowledgement frame successfully received on the at least one other link indicating that the AMPDUs on the first link have been successfully received by the receiver, determining not to retransmit.

[0044] Still referring to Figure 2, in a specific application scenario, based on the transmitter not successfully receiving the acknowledgement frame BA1 on the link Link1, the transmitter may detect whether the acknowledgement frame BA2 is successfully received on the link Link2. In response to the transmitter successfully receiving the acknowledgement frame BA2 and determining that the MPDUs with the sequence numbers of 1 and 2 on the link Link1 have been successfully received based on the reception information in the acknowledgement frame BA2, the transmitter determines to retransmit and merely retransmits the MPDU with the sequence number of 3 in the AMPDU1.

[0045] Alternatively, in response to the transmitter successfully receiving the acknowledgement frame BA2 and determining that the receiver has successfully received all the AMPDUs on the link Link1 based on the reception information in the acknowledgement frame BA2, the transmitter determines that retransmission is not required.

[0046] In some embodiments, S102 may include: detecting whether the acknowledgement frame is successfully received on the at least one other link at an acknowledgement timeout time of the first link; or detecting whether the acknowledgement frame is successfully received on the at least one other link at the time of a preset offset before the time when the first link accesses a channel next time.

[0047] In embodiments of the present disclosure, the transmitter may determine whether the acknowledgement frame is successfully received on the at least one other link at a specific time point. The specific time point may be the acknowledgement timeout time of the first link, or the time of the preset offset before the time when the first link accesses the channel next time.

[0048] In some embodiments, the transmitter sets a timer starting at a transmission end time of the transmitted AMPDUs. If the BA frame is not received within the duration of the timer, the transmitted AMPDUs are considered to fail to be transmitted. The acknowledgement timeout time refers to a time point when the time period ends.

[0049] In some embodiments, when the transmitter contends for a channel, a random backoff value is generated. When the backoff value decreases to 0, if channel detection is still idle, it is considered that the transmitter accesses the channel. The time when the backoff value decreases to 0 serves as the time of the transmitter accessing the channel.

[0050] Referring to Figure 3, in a specific application scenario, the transmitter may detect whether the acknowledgement frame BA2 is successfully received on the link Link2 at the acknowledgement timeout time (AckTimeout, i.e., the time T2 shown in Figure 3) after the AMPDU1 is transmitted on the link Link1. Alternatively, the transmitter may detect whether the acknowledgement frame BA2 is successfully received on the link Link2 at the time of the preset offset before the time when the link Link1 accesses a next channel resource, i.e., the time T3 of the preset offset before the time of starting to transmit the AMPDU3.

[0051] In some embodiments, the preset offset includes a predetermined number of time slots.

[0052] A specific value of the preset offset may be determined based on practical application scenario, which is not limited in embodiments of the present disclosure.

[0053] In some embodiments, the acknowledgement frame is a block acknowledgement frame under either an immediate BA agreement or a delayed BA agreement.

[0054] If the acknowledgement frame is under a delayed BA agreement, after transmitting the AMPDU, the transmitter needs to transmit a BAR, and waits to receive the corresponding BA frame within the AckTimeout time after transmitting the BAR.

[0055] If the acknowledgement frame is under an immediate BA agreement, the transmitter doesn't need to transmit a BAR to solicit the BA frame.

[0056] Figure 4 is a flow chart of a data response method according to an embodiment.

[0057] The data response method may be applied in a receiver, that is, steps of the method shown in Figure 4 may be performed by a device at the receiver, such as a smart phone or a router.

[0058] The method includes S401 and S402.

[0059] In S401, when acknowledgement frames need to be transmitted on a plurality of links, reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links is determined.

[0060] In S402, the acknowledgement frames are transmitted on the plurality of links at the transmission time, wherein each of the acknowledgement frames includes the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and based on determining to retransmit, determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links include the first link and the at least one other link.

[0061] As the transmitter can transmit the AMPDUs to the receiver on the plurality of links and the receiver can receive the AMPDUs on the plurality of links, the receiver can know whether the AMPDUs are successfully received on each link. Therefore, the receiver may determine the reception information of the AMPDUs belonging to the same block acknowledgement agreement at the transmission time of the acknowledgement frames on the plurality of links, when the acknowledgement frames need to be transmitted on the plurality of links.

[0062] For different types of acknowledgement frames, transmission times of the acknowledgement frames are different. Specifically, if the acknowledgement frame is under a delayed BA agreement, a BAR needs to be transmitted after the transmitter transmits the AMPDUs, and the receiver transmits a BA frame within the AckTimeout time after the BAR is transmitted.

[0063] If the acknowledgement frame is under an immediate BA agreement, the transmitter doesn't need to transmit a BAR to solicit a BA frame.

[0064] In some embodiments, the reception information includes a reception status which indicates that the AMPDUs are completely received on the plurality of links or a reception status which indicates that the AMPDUs are partially received on the plurality of links.

[0065] Referring to Figure 2, in a specific application scenario, the receiver transmits on the link Link1 an acknowledgement frame BA1 which includes reception information of MPDUs with sequence numbers of 1, 2, 3, 4 and 5, where the MPDUs with the sequence numbers of 4 and 5 are part of data of the AMPDU2 on the link Link2, and the acknowledgement frame BA1 indicates that the AMPDU2 on the link Link2 is partially received successfully. Besides, the receiver transmits on the link Link2 an acknowledgement frame BA2 which includes reception information of MPDUs with sequence numbers of 1, 2, 3, 4, 5 and 6. Based on the transmitter not successfully receiving the acknowledgement frame BA1 but successfully receiving the acknowledgement frame BA2, the transmitter can determine based on the acknowledgement frame BA2 that the MPDU with the sequence number of 3 has not been successfully received on the link Link1, and then retransmits the MPDU with the sequence number of 3 in the AMPDU3 on the link Link1. Further, the AMPDU3 may only include the retransmitted MPDU with the sequence number of 3, or may include the retransmitted MPDU with the sequence number of 3 and data originally to be transmitted in the AMPDU3, such as MPDUs with sequence numbers of 7 and 8.

[0066] Referring to Figure 5, in another specific application scenario, a delayed BA agreement is set up between a transmitter and a receiver. After finishing transmitting an AMPDU1, the transmitter may transmit a BAR1, and the receiver transmits a BA1 acknowledgement frame within an AckTimeout time after the BAR1 is transmitted. At the time, the receiver has completely received the MPDUs with the sequence numbers of 1, 2, 3, 4 and 5, and thus the receiver transmits on the link Link1 the acknowledgement frame BA1 which includes reception information of MPDUs with the sequence numbers of 1, 2, 3, 4, 5. After finishing transmitting an AMPDU2, the transmitter may transmit a BAR2, and the receiver transmits a BA2 acknowledgement frame within an AckTimeout time after the BAR2 is transmitted. The acknowledgement frame BA2 transmitted by the receiver on the link Link2 includes reception information of MPDUs with the sequence numbers of 1, 2, 3, 4, 5 and 6, and indicates that AMPDUs on the links Link1 and Link2 are completely received successfully. Based on the transmitter not successfully receiving the acknowledgement frame BA1 but successfully receiving the acknowledgement frame BA2, the transmitter can determine based on the acknowledgement frame BA2 that the receiver has successfully received the MPDUs with the sequence numbers of 1, 2 and 3, and then the transmitter can determine not to retransmit the MPDUs in the AMPDU1. That is, when AMPDU3 is subsequently transmitted on link Link1 and AMPDU4 is subsequently transmitted on link Link2, neither AMPDU3 nor AMPDU4 includes an MPDU in AMPDU1.

[0067] Referring to Figure 6, Figure 6 is a structural diagram of a data retransmission device 50 according to an embodiment.

[0068] The data retransmission device 50 includes: an acknowledgement frame receiving circuitry 501 configured to receive from a receiver acknowledgement frames on a plurality of links, wherein each of the acknowledgement frames includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; a detecting circuitry 502 configured to: based on the acknowledgement frame being not successfully received on a first link, detect whether the acknowledgement frame is successfully received on at least one other link, and determine whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link; and a retransmitting circuitry 503 configured to: based on determining to retransmit, determine MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmit the MPDUs to be retransmitted on any one of the plurality of links.

[0069] In embodiments of the present disclosure, the acknowledgement frame transmitted by the receiver includes reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on all the plurality of links. Therefore, based on the acknowledgement frame being not successfully received by the transmitter on the first link, whether to retransmit and the MPDUs to be retransmitted can be determined based on the reception information in the acknowledgement frame successfully received on the at least one other link, which ensures that the determined MPDUs to be retransmitted includes the AMPDUs needing to be retransmitted, thereby avoiding unnecessary data retransmission and improving transmission efficiency.

[0070] More details of working principles and working modes of the data retransmission device 50 can be found in the above descriptions of Figures 1 to 4, and are not described here.

[0071] Referring to Figure 7, Figure 7 is a structural diagram of a data response device 60 according to an embodiment.

[0072] The data response device 60 includes: a reception information determining circuitry 601 configured to: when acknowledgement frames need to be transmitted on a plurality of links, determine reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links; and an acknowledgement frame transmitting circuitry 602 configured to transmit the acknowledgement frames on the plurality of links at the transmission time, wherein each of the acknowledgement frames includes the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and base on determining to retransmit, determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links include the first link and the at least one other link.

[0073] More details of working principles and working modes of the data response device 60 can be found in the above descriptions of Figures 1 to 5, and are not described here.

[0074] In an embodiment of the present disclosure, a storage medium having computer instructions stored therein is provided, wherein when the computer instructions are executed, the above method as shown in Figure 1 or Figure 4 is performed. The storage medium may include a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk. The storage medium may include a non-volatile or non-transitory memory.

[0075] In an embodiment of the present disclosure, a device including a memory and a processor and applied in a transmitter is provided, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the above method as shown in Figure 1 is performed. The device applied in the transmitter may include but not limited to a terminal equipment such as a mobile phone, a computer or a tablet computer, or a relay equipment such as a router.

[0076] In an embodiment of the present disclosure, a device including a memory and a processor and applied in a receiver is provided, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the above method as shown in Figure 4 is performed. The device applied in the receiver may include but not limited to a terminal equipment such as a mobile phone, a computer or a tablet computer, or a relay equipment such as a router.

[0077] Although the present disclosure has been disclosed above with reference to preferred embodiments thereof, it should be understood that the disclosure is presented by way of example only, and not limitation. Those skilled in the art can modify and vary the embodiments without departing from the spirit and scope of the present disclosure.


Claims

1. A data retransmission method, characterized by comprising:

receiving from a receiver acknowledgement frames on a plurality of links, wherein each of the acknowledgement frames comprises reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links;

based on the acknowledgement frame being not successfully received on a first link, detecting whether the acknowledgement frame is successfully received on at least one other link, and determining whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, wherein the plurality of links comprise the first link and the at least one other link; and

based on determining to retransmit, determining MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmitting the MPDUs to be retransmitted on any one of the plurality of links.


 
2. The method according to claim 1, characterized in that said detecting whether the acknowledgement frame is successfully received on at least one other link comprises:

detecting whether the acknowledgement frame is successfully received on the at least one other link at an acknowledgement timeout time of the first link; or

detecting whether the acknowledgement frame is successfully received on the at least one other link at the time of a preset offset before the time when the first link accesses a channel next time.


 
3. The method according to claim 2, characterized in that the preset offset comprises a predetermined number of time slots.
 
4. The method according to claim 1, characterized in that said determining whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link comprises:
determining not to retransmit, based on the reception information in the acknowledgement frame successfully received on the at least one other link indicating that the AMPDUs on the first link have been successfully received by the receiver.
 
5. The method according to claim 1, characterized in that the reception information indicates whether the AMPDUs have been received by the receiver, and said determining MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link comprises:
determining the AMPDUs which have not been successfully received by the receiver, based on the reception information in the acknowledgement frame successfully received on the at least one other link, as the MPDUs to be retransmitted.
 
6. The method according to claim 1, characterized in that the acknowledgement frame is a block acknowledgement frame under either an immediate block acknowledgement agreement or a delayed block acknowledgement agreement.
 
7. A data response method, characterized by comprising:

determining reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of acknowledgement frames on a plurality of links, based on the acknowledgement frames needing to be transmitted on the plurality of links; and

transmitting the acknowledgement frames on the plurality of links at the transmission time,

wherein each of the acknowledgement frames comprises the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and based on determining to retransmit, the transmitter determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links comprise the first link and the at least one other link.


 
8. The method according to claim 7, characterized in that the reception information comprises a reception status which indicates that the AMPDUs are completely received on the plurality of links or a reception status which indicates that the AMPDUs are partially received on the plurality of links.
 
9. A data retransmission device, characterized by comprising:

an acknowledgement frame receiving circuitry configured to receive from a receiver acknowledgement frames on a plurality of links, wherein each of the acknowledgement frames comprises reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of the acknowledgement frames on the plurality of links;

a detecting circuitry configured to: based on the acknowledgement frame being not successfully received on a first link, detect whether the acknowledgement frame is successfully received on at least one other link, and determine whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, wherein the plurality of links comprise the first link and the at least one other link; and

a retransmitting circuitry configured to: based on determining to retransmit, determine MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmit the MPDUs to be retransmitted on any one of the plurality of links.


 
10. A data response device, characterized by comprising:

a reception information determining circuitry configured to: determine reception information of AMPDUs belonging to a same block acknowledgement agreement at a transmission time of acknowledgement frames on a plurality of links, based on the acknowledgement frames needing to be transmitted on the plurality of links; and

an acknowledgement frame transmitting circuitry configured to transmit the acknowledgement frames on the plurality of links at the transmission time,

wherein each of the acknowledgement frames comprises the reception information, so that based on the acknowledgement frame being not successfully received on a first link, a transmitter detects whether the acknowledgement frame is successfully received on at least one other link, and determines whether to retransmit based on the reception information in the acknowledgement frame successfully received on the at least one other link, and based on determining to retransmit, the transmitter determines MPDUs to be retransmitted based on the reception information in the acknowledgement frame successfully received on the at least one other link, and retransmits the MPDUs to be retransmitted on any one of the plurality of links, wherein the plurality of links comprise the first link and the at least one other link.


 
11. A storage medium having computer instructions stored therein, characterized in that when the computer instructions are executed, the method according to any one of claims 1 to 6 or the method according to claim 7 or 8 is performed.
 
12. A device comprising a memory and a processor and applied in a transmitter, characterized in that the memory has computer instructions stored therein, and when the processor executes the computer instructions, the method according to any one of claims 1 to 6 is performed.
 
13. A device comprising a memory and a processor and applied in a receiver, characterized in that the memory has computer instructions stored therein, and when the processor executes the computer instructions, the method according to claim 7 or 8 is performed.
 




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Cited references

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