(19)
(11)EP 3 706 093 A1

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

(43)Date of publication:
09.09.2020 Bulletin 2020/37

(21)Application number: 17932600.4

(22)Date of filing:  22.11.2017
(51)International Patent Classification (IPC): 
G08C 17/02(2006.01)
H04W 36/14(2009.01)
(86)International application number:
PCT/CN2017/112347
(87)International publication number:
WO 2019/100259 (31.05.2019 Gazette  2019/22)
(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:
MA MD

(71)Applicant: Beijing Xiaomi Mobile Software Co., Ltd.
Beijing 100085 (CN)

(72)Inventor:
  • HONG, Wei
    Beijing 100085 (CN)

(74)Representative: Gevers Patents 
Intellectual Property House Holidaystraat 5
1831 Diegem
1831 Diegem (BE)

  


(54)DATA TRANSMISSION METHOD, APPARATUS, AND UNMANNED AERIAL VEHICLE


(57) The disclosure relates to a data transmission method and apparatus, and unmanned aerial vehicle(UAV). The data transmission method includes: based on signal strengths of a mobile network and a WIFI network accessed by an unmanned aerial vehicle accesses, determining a transmission link for data to be transmitted; and sending the data to be transmitted through the transmission link. A UAV is enabled to dynamically adjust, based on the signal strengths of the mobile network and the WIFI network accessed by the unmanned aerial vehicle, the transmission link for sending the data to be transmitted, thus better integrating the resources of the mobile network and the WIFI network accessed by the UAV, and solving the problem that the data transmission performance is caused to be relatively low due to data transmission between the UAV and the UAV controller through the WIFI network in the related arts.




Description

TECHNICAL FIELD



[0001] The disclosure relates to the technical field of communications, and more particularly, to a data transmission method and apparatus, and an unmanned aerial vehicle.

BACKGROUND



[0002] Unmanned aerial vehicle is called UAV for short, which has been applied to some specific scenarios and can carry out tasks such as aerial photographing, unmanned detection and reconnaissance, surveying and mapping, highway survey, urban planning, ecological and environmental monitoring, scientific investigation, oil exploration, aerial remote sensing, border patrol, forest fire prevention and disaster assessment.

[0003] In order to further expand the application scope of UAV, the 3rd Generation Partnership Project (3GPP) proposed a research on enabling the demand-satisfying service provided for a UAV by a cellular network to be more standardized in the discussion of a "UAV enhanced support" project. In related arts, data transmission between a UAV and a UAV controller is usually realized through a Wireless-Fidelity (WIFI) network. The WIFI network has defects including channel occupation, great interference, limited coverage and the like. Therefore, the performance of data transmission between a UAV and a UAV controller is low. Data transmission based on a cellular network has features such as continuous coverage and guaranteed data transmission. However, no solution has yet been proposed in related arts to address how to improve the performance of data transmission between a UAV and a UAV controller through a cellular network and a WIFI network.

SUMMARY



[0004] In order to overcome the problems existing in the related arts, the embodiments of the disclosure provide a data transmission method and apparatus as well as an Unmanned Aerial Vehicle (UAV) to improve the efficiency of data transmission between a UAV controller and a UAV through a WIFI network and a cellular network.

[0005] According to the first aspect of the embodiments of the disclosure, the disclosure provides a data transmission method which includes:

determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by a UAV; and

sending the data to be transmitted through the transmission link.



[0006] In an embodiment, determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the UAV may include:

in a case that the signal strength of the WIFI network is higher than a first strength threshold, determining a first link corresponding to the WIFI network as the transmission link; or

in a case that the signal strength of the WIFI network is lower than a first strength threshold and higher than a second strength threshold, and the signal strength of the mobile network is higher than a third strength threshold and not higher than a fourth strength threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or

in a case that the signal strength of the WIFI network is lower than a second strength threshold and the signal strength of the mobile network is higher than a fourth strength threshold, determining the second link corresponding to the mobile network as the transmission link.



[0007] In an embodiment, the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a base station; or,
the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a UAV controller.

[0008] In an embodiment, determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the UAV may further include:

in a case that a volume of the data to be transmitted is greater than a first volume threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or

in a case that a volume of the data to be transmitted is not greater than a first volume threshold, comparing the signal strength of the mobile network with the signal strength of the WIFI network;

in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or

in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link.



[0009] In an embodiment, sending the data to be transmitted through the transmission link may include:

dividing the data to be transmitted into two groups of data according to a predetermined ratio in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link; and

sending one of the two groups of data to a UAV controller through the first link and sending the other group of data to a base station through the second link to forward the other group of data by the base station to the UAV controller.



[0010] In an embodiment, the predetermined ratio may be set by the UAV controller.

[0011] According to the second aspect of the embodiments of the disclosure, the disclosure provides a data transmission apparatus which includes:

a determination module configured to determine, based on signal strengths of a mobile network and a WIFI network accessed by a UAV, a transmission link for data to be transmitted; and

a sending module configured to send the data to be transmitted through the transmission link.



[0012] In an embodiment, the determination module includes:

a first determination sub-module configured to, in a case that the signal strength of the WIFI network is higher than a first strength threshold, determine a first link corresponding to the WIFI network as the transmission link;

a second determination sub-module configured to, in a case that the signal strength of the WIFI network is lower than the first strength threshold and higher than a second strength threshold, and the signal strength of the mobile network is higher than a third strength threshold and not higher than a fourth strength threshold, determine the first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; and

a third determination sub-module configured to, in a case that the signal strength of the WIFI network is lower than the second strength threshold and the signal strength of the mobile network is higher than the fourth strength threshold, determine the second link corresponding to the mobile network as the transmission link.



[0013] In an embodiment, the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a base station; or,
the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a UAV controller.

[0014] In an embodiment, the determination module may further include:

a fourth determination sub-module configured to, in a case that a volume of the data to be transmitted is greater than a first volume threshold, determine a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link;

a comparison sub-module configured to, in a case that a volume of the data to be transmitted is not greater than the first volume threshold, compare the signal strength of the mobile network with the signal strength of the WIFI network;

a fifth determination sub-module configured to, in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determine the second link corresponding to the mobile network as the transmission link; and

a sixth determination sub-module configured to, in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determine the first link corresponding to the WIFI network as the transmission link.



[0015] In an embodiment, the sending module may include:

a division sub-module configured to, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link, divide the data to be transmitted into two groups of data according to a predetermined ratio;

a first sending sub-module configured to send one of the two groups of data to a UAV controller through the first link; and

a second sending sub-module configured to send the other group of data to the base station through the second link to forward the other group of data by the base station to the UAV controller.



[0016] In an embodiment, the predetermined ratio may be set by the UAV controller.

[0017] According to the third aspect of the embodiments of the disclosure, the disclosure provides a UAV. The UAV includes:

a processor; and

a memory configured to store instructions executable by a processor, wherein

the processor is configured to:

determine a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by the UAV; and

send the data to be transmitted through the transmission link.



[0018] According to the fourth aspect of the embodiments of the disclosure, the disclosure provides a non-temporary computer-readable storage medium. The storage medium may have computer instructions stored thereon. When the instructions are executed by the processor, the following steps are implemented, including:

determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by a UAV; and

sending the data to be transmitted through the transmission link.



[0019] The technical solution provided by the embodiments of the disclosure may have the following beneficial effects:
The mobile network and the WIFI network accessed by a UAV are two independent communication networks. By adopting the above technical solution, the UAV can dynamically adjust, based on the signal strengths of the mobile network and the WIFI network accessed by the UAV, the transmission link for sending data to be transmitted, thus better integrating the resources of the mobile network and the WIFI network accessed by the UAV, and solving the problem that the data transmission performance is low, which is caused by data transmission between a UAV and a UAV controller through a WIFI network in the related arts.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory and shall not limit the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS



[0021] The accompanying drawings, which are incorporated in and constitute a part of this description, illustrate embodiments consistent with the disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1A is a flowchart of a data transmission method according to an exemplary embodiment.

FIG. 1B is a scenario diagram of a data transmission method according to an exemplary embodiment.

FIG. 2 is a flowchart of another data transmission method according to an exemplary embodiment.

FIG. 3 is a flowchart of another data transmission method according to an exemplary embodiment.

FIG. 4 is a block diagram of a data transmission apparatus according to an exemplary embodiment.

FIG. 5 is a block diagram of another data transmission apparatus according to an exemplary embodiment.

FIG. 6 is a block diagram of an apparatus applicable to data transmission according to an exemplary embodiment.


DETAILED DESCRIPTION



[0022] Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise represented. The implementations set forth in the following description of exemplary embodiments do not represent all implementations consistent with the disclosure. Instead, they are merely examples of apparatuses and methods consistent with aspects related to the disclosure as recited in the appended claims.

[0023] FIG. 1A is a flowchart of a data transmission method according to an exemplary embodiment. FIG. 1B is a scenario diagram of a data transmission method according to an exemplary embodiment. The data transmission method may be applied to an Unmanned Aerial Vehicle (UAV). As illustrated in FIG. 1A, the data transmission method includes the following steps 101-102:
In step 101, based on signal strengths of a mobile network and a WIFI network accessed by a UAV, a transmission link for data to be transmitted is determined.

[0024] In an embodiment, the UAV may directly send data to a UAV controller through a first link in the WIFI network, or the UAV may send data to a base station through a second link in the mobile network, and then the base station sends the data to the UAV controller.

[0025] In an embodiment, the data to be transmitted may be a data packet to be sent to the UAV controller cached in the buffer of a Packet Data Convergence Protocol (PDCP) of the UAV.

[0026] In an embodiment, the WIFI network is a free network and the mobile network is a charged network, therefore, when the signal strength of the WIFI network is higher, the first link in the WIFI network may be preferentially determined as the transmission link, while when the signal strength of the WIFI network is lower and the signal strength of the mobile network is higher, both the first link corresponding to the WIFI network and a second link corresponding to the mobile network may be determined as the transmission link or only the second link corresponding to the mobile network is determined as the transmission link. Based on the signal strengths of the mobile network and the WIFI network accessed by the UAV, the description of the embodiments illustrated in FIG. 2 and FIG. 3 may be refered to for the specific implementation mode of determining the transmission link for the data to be transmitted, which is thus not described in detail here.

[0027] In step 102, the data to be transmitted is sent through the transmission link.

[0028] In an embodiment, after the transmission link for the data to be transmitted is determined, the data to be transmitted may be sent through the transmission link.

[0029] In an exemplary scenario, as illustrated in FIG. 1B, exemplary description is made by taking that the mobile network is a Long Term Evolution (LTE) network and the base station is an evolved NodeB (eNB) as an example (the mobile network is not limited to the LTE network, which may also be 5G or other cellular networks). In the scenario illustrated in FIG. 1B, an eNB 10, a UAV 20 and a UAV controller 30 are shown.The UAV 20 is located within the coverage of the eNB 10, and is within the same WIFI network as the UAV controller 30. Based on the signal strengths of the WIFI network and the mobile network, in one case, the UAV 20 may transmit data to the UAV controller 30 through a first link 141 in the WIFI network. When the signal strength of the WIFI network is low, part or all of the data may be transmitted to the eNB 10 through a second link 142 in the mobile network in order to improve the efficiency of data transmission of the UAV 20, and then this part or all of data may be forwarded by the eNB 10 to the UAV controller 30. The efficiency of data transmission between the UAV 20 and the UAV controller 30 is effectively improved.

[0030] The mobile network and the WIFI network accessed by the UAV can be two independent communication networks. In the embodiment, through the above steps 101 and 102, the UAV can dynamically adjust, based on the signal strengths of the mobile network and WIFI network accessed by the UAV, the transmission link for the data to be transmitted, thus better integrating the resources of the mobile network and the WIFI network accessed by the UAV, and solving the problem that the data transmission performance is caused to be relatively low due to data transmission between a UAV and a UAV controller through a WIFI network in the related arts.

[0031] Please refer to the following embodiments for details on how to transmit data.

[0032] The technical solution provided by the embodiments of the disclosure will be described below through the following specific embodiments.

[0033] FIG. 2 is a flowchart of another data transmission method according to an exemplary embodiment. The embodiment is exemplarily described by using the above method provided by the embodiments of the disclosure, taking that the UAV determines the transmission link based on the signal strengths of the mobile network and the WIFI network and transmits the data as an example and referring to FIG. 1B. As illustrated in FIG. 2, the method includes the following steps:

[0034] In step 201, the signal strengths of the mobile network and the WIFI network accessed by the UAV are determined, and step 202, step 203 or step 204 is correspondingly executed based on the signal strengths of the mobile network and the WIFI network accessed by the UAV.

[0035] In step 202, in a case that the signal strength of the WIFI network is higher than a first strength threshold, the first link corresponding to the WIFI network is determined as the transmission link, the data to be transmitted is sent through the first link, and the process ends.

[0036] In an embodiment, the first strength threshold may be a relatively high value. For example, the first strength threshold is -60dB. When the signal strength of the WIFI network is higher than the first strength threshold, it indicates that the signal quality of the WIFI network is very good and is enough to transmit the service data of the UAV, so only the first link corresponding to WIFI network may be determined as the transmission link.

[0037] In step 203, in a case that the signal strength of the WIFI network is lower than a second strength threshold and the signal strength of the mobile network is higher than a fourth strength threshold, a second link corresponding to the mobile network is determined as the transmission link, the data to be transmitted is sent through the second link, and the process ends.

[0038] In an embodiment, when the signal strength of the WIFI network is lower than the second strength threshold, it indicates that the signal quality of the WIFI network is relatively poor and the data transmission rate is very low; when the signal strength of the mobile network is higher than the fourth strength threshold, it indicates that the signal quality of the mobile network is very good, so only the second link in the mobile network may be determined as the transmission link, in order to avoid data loss caused by data transmission through the WIFI network.

[0039] In step 204, in a case that the signal strength of the WIFI network is lower than the first strength threshold and higher than the second strength threshold, and the signal strength of the mobile network is higher than the third strength threshold and not higher than the fourth strength threshold, the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link.

[0040] In an embodiment, the second strength threshold may be a value smaller than the first strength threshold. For example, the first strength threshold is -80dB. When the signal strength of the WIFI network is lower than the first strength threshold and higher than the second strength threshold, it indicates that the signal quality of the WIFI network is average and the WIFI network can be used to transmit the service data of the UAV, but the data transmission rate may be relatively low. In an embodiment, the third strength threshold may be a value smaller than the fourth strength threshold. When the signal strength of the mobile network is higher than the third strength threshold and not higher than the fourth strength threshold, it indicates that the signal quality of the mobile network is relatively good. Therefore, in order to improve the data transmission efficiency of the data to be transmitted, the data to be transmitted may be transmitted through the mobile network and the WIFI network at the same time.

[0041] In an embodiment, the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by the base station. In an embodiment, the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by the UAV controller.

[0042] In step 205, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link, the data to be transmitted is divided into two groups of data according to a predetermined ratio.

[0043] In an embodiment, the predetermined ratio may be set by the UAV controller. The predetermined ratio may be a fixed value, such as 2:1. The predetermined ratio may also be determined based on the signal strength of the WIFI network and the signal strength of the mobile network. For example, when the signal strength of the WIFI network and the signal strength of the mobile network are equal, the predetermined ratio may be 1:1; when the signal strength of the WIFI network is much higher than the signal strength of mobile network, the predetermined ratio may be 3:1; when the signal strength of the WIFI network is a little bit higher than the signal strength of the mobile network, the predetermined ratio may be 3:2.

[0044] In an embodiment, the data to be transmitted may be divided by taking a bit as a unit. For example, the data represented by the first half bits of the data to be transmitted is divided into a first group of data, and the data represented by the second half bits is divided into a second group of data. For example, the first 6 bits of 12 bits may be used as the first group of data, and the last 6 bits may be used as the second group of data.

[0045] In step 206, one of the two groups of data is sent to the UAV controller through the first link, and the other group of data is sent to the base station through the second link and then forwarded by the base station to the UAV controller.

[0046] In an embodiment, based on the signal strengths of the WIFI network and the mobile network, the one group of data sent to the base station through the second link and the other group of data sent to the UAV controller through the first link can be determined. For example, when the signal strength of the WIFI network is higher than the signal strength of the mobile network, the group with more data may be sent to the UAV controller through the first link.

[0047] In one exemplary scenario, as illustrated in FIG. 1B, under the situation that the UAV 20 can access the mobile network and the WIFI network at the same time, if the signal strength of the WIFI network is very good, the first link in the WIFI network may be determined as the transmission link only, so as to reduce the cost in using the mobile network to transmit data; if the signal strength of the WIFI network is average and the signal strength of the mobile network is also average, both the first link corresponding to the WIFI network and the second link corresponding to the mobile network may be determined as the transmission link, so as to ensure that the data of the UAV can be quickly uploaded to the UAV controller. When the signal strength of the WIFI network is relatively low and the signal strength of the mobile network is very good, the second link in the mobile network may be determined as the transmission link, so as to ensure that the UAV 20 can transmit data to the UAV controller 30 through the most suitable transmission link.

[0048] In the embodiment, the network used by the UAV may be adjusted according to the signal strengths of the mobile network and the WIFI network, so as to ensure that the UAV can transmit data through the best network, thus effectively improving the performance of the UAV when transmitting data.

[0049] FIG. 3 is a flowchart of another data transmission method according to an exemplary embodiment. The embodiment is exemplarily described by using the above method provided by the embodiments of the disclosure and taking that the UAV determines the transmission link based on a volume of the data to be transmitted of the UAV and the signal strengths of the mobile network and the WIFI network and transmits the data as an example. As illustrated in FIG. 3, the method includes the following steps:

[0050] In step 301, the volume of the data to be transmitted is determined. In a case that the volume of the data to be transmitted is greater than a first volume threshold, step 302 is executed, otherwise, in a case that a volume of the data to be transmitted is not greater than the first volume threshold, step 305 is executed.

[0051] In an embodiment, the volume of the data to be transmitted may be obtained based on the volume of data cached in the buffer. For example, the volume is 12 bits. In an embodiment, the first volume threshold may be set by the UAV controller, generally not exceeding the volume of data that the buffer can cache.

[0052] In step 302, the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link.

[0053] In an embodiment, when the volume of the data to be transmitted is greater than the first volume threshold, it indicates that the volume of the data to be transmitted of the UAV is relatively great. In order to complete the transmission of the data as soon as possible, the data may be divided into two groups of data, which may be sent through the first link and the second link respectively.

[0054] In step 303, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link, the data to be transmitted is divided into two groups of data according to a predetermined ratio.

[0055] In step 304, one of the two groups of data is sent to the UAV controller through the first link, and the other group of data is sent to the base station through the second link and then forwarded by the base station to the UAV controller.

[0056] In an embodiment, the description of step 205 and step 206 of the embodiment illustrated in FIG. 2 may be referred to for the description of step 303 and step 304, which is thus not described in detail here.

[0057] In step 305, the signal strength of the mobile network is compared with the signal strength of the WIFI network. When the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, step 306 is executed, otherwise, the signal strength of the mobile network is lower than the signal strength of the WIFI network, step 307 is executed.

[0058] In an embodiment, when a volume is smaller than the first volume threshold, it indicates that the data to be transmitted is relatively less, so the data may be transmitted through only one link. Therefore, the signal strength of the mobile network and the signal strength of the WIFI network may be compared, and then the link with better signal quality may be selected for data transmission.

[0059] In step 306, the second link corresponding to the mobile network is determined as the transmission link.

[0060] In step 307, the first link corresponding to the WIFI network is determined as the transmission link.

[0061] In the embodiment, based on the volume of the data to be transmitted, whether to transmit data through one link or two links may be firstly determined. When it is determined to transmit data through one link, the link with better signal quality may be preferentially selected as the transmission link, thus better integrating the resources of a mobile network and a WIFI network accessed by a UAV, solving the problem that the data transmission performance is caused to be relatively low due to data transmission between a UAV and a UAV controller through a WIFI network in the related arts, and improving the data transmission performance of the UAV.

[0062] FIG. 4 is a block diagram of a data transmission apparatus according to an exemplary embodiment. As illustrated in FIG. 4, the data transmission apparatus includes:

a determination module 41 configured to determine, based on signal strengths of a mobile network and a WIFI network accessed by a UAV, a transmission link for data to be transmitted;

a sending module 42 configured to send the data to be transmitted through the transmission link.



[0063] FIG. 5 is a block diagram of another data transmission apparatus according to an exemplary embodiment. As illustrated in FIG. 5, on the basis of the embodiment illustrated in FIG. 4, In an embodiment, the determination module 41 may include:

a first determination sub-module 411 configured to, in a case that the signal strength of the WIFI network is higher than a first strength threshold, determine a first link corresponding to the WIFI network as the transmission link;

a second determination sub-module 412 configured to, in a case that the signal strength of the WIFI network is lower than the first strength threshold and higher than a second strength threshold, and the signal strength of the mobile network is higher than a third strength threshold and not higher than a fourth strength threshold, determine the first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link;

a third determination sub-module 413 configured to, in a case that the signal strength of the WIFI network is lower than the second strength threshold and the signal strength of the mobile network is higher than the fourth strength threshold, determine the second link corresponding to the mobile network as the transmission link.



[0064] In an embodiment, the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a base station; or,
the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold may be set by a UAV controller.

[0065] In an embodiment, the determination module 41 may further include:

a fourth determination sub-module 414 configured to, in a case that a volume of the data to be transmitted is greater than a first volume threshold, determine a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link;

a comparison sub-module 415 configured to, in a case that a volume of the data to be transmitted is not greater than the first volume threshold, compare the signal strength of the mobile network with the signal strength of the WIFI network;

a fifth determination sub-module 416 configured to, in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determine the second link corresponding to the mobile network as the transmission link;

a sixth determination sub-module 417 configured to, in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determine the first link corresponding to the WIFI network as the transmission link.



[0066] In an embodiment, the sending module may include:

a division sub-module 421 configured to, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link, divide the data to be transmitted into two groups of data according to a predetermined ratio;

a first sending sub-module 422 configured to send one of the two groups of data to the unmanned aerial vehicle controller through the first link;

a second sending sub-module 423 configured to send the other group of data to the base station through the second link to forward the other group of data by the base station to the UAV controller.



[0067] In an embodiment, the predetermined ratio may be set by the unmanned aerial vehicle controller.

[0068] With respect to the apparatus in the above embodiment, the specific manners for performing operations for individual modules therein have been described in detail in the embodiments regarding the method, which will not be elaborated herein.

[0069] FIG. 6 is a block diagram of an apparatus applicable to data transmission according to an exemplary embodiment. For example, the apparatus 600 is a UAV.

[0070] Referring to FIG. 6, the apparatus 600 may include one or a plurality of following components: a processing component 602, a memory 604, a power component 606, a multimedia component 608, an audio component 610, an Input/Output (I/O) interface 612, a sensor component 614, and a communication component 616.

[0071] The processing component 602 is typically configured to control overall operations of the apparatus 600, such as the operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 602 may include one or more processors 620 to execute instructions to perform all or part of the steps in the above described methods. Moreover, the processing component 602 may include one or more modules which facilitate the interaction between the processing component 602 and other components. For example, the processing component 602 may include a multimedia module to facilitate the interaction between the multimedia component 608 and the processing component 602.

[0072] The memory 604 is configured to store various types of data to support the operation of the apparatus 600. Examples of such data include instructions for any applications or methods operated on the apparatus 600, contact data, phonebook data, messages, pictures, video, etc. The memory 604 may be implemented using any type of volatile or non-volatile memory devices, or a combination thereof, such as a Static Random Access Memory (SRAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Erasable Programmable Read-Only Memory (EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic memory, a flash memory, a magnetic disk or an optical disk.

[0073] The power component 606 is configured to provide power to various components of the apparatus 600. The power component 606 may include a power management system, one or more power sources, and any other components associated with the generation, management, and distribution of power in the apparatus 600.

[0074] The multimedia component 608 may include a screen providing an output interface between the apparatus 600 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes the touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may not only sense a boundary of a touch or swipe action, but also sense a period of time and a pressure associated with the touch or swipe action. In some embodiments, the multimedia component 608 includes a front camera and/or a rear camera. The front camera and the rear camera may receive external multimedia data while the apparatus 600 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the rear camera may be a fixed optical lens system or have focus and optical zoom capability.

[0075] The audio component 610 is configured to output and/or input audio signals. For example, the audio component 610 includes a microphone (MIC) configured to receive an external audio signal in a case that the apparatus 600 is in an operation mode, such as a call mode, a recording mode and a voice recognition mode. The received audio signal may be further stored in the memory 604 or transmitted via the communication component 616. In some embodiments, the audio component 610 further includes a speaker to output audio signals.

[0076] The I/O interface 612 may provide an interface between the processing component 602 and peripheral interface modules, such as a keyboard, a click wheel and buttons. The buttons may include, but are not limited to, a home button, a volume button, a starting button, and a locking button.

[0077] The sensor component 614 may include one or more sensors to provide status assessments of various aspects of the apparatus 600. For example, the sensor component 614 may detect an open/closed status of the apparatus 600, relative positioning of components, e.g., the display and the keypad, of the apparatus 600, a change in position of the apparatus 600 or a component of the apparatus 600, a presence or absence of user contact with the apparatus 600, an orientation or an acceleration/deceleration of the apparatus 600, and a change in temperature of the apparatus 600. The sensor component 614 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 614 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 614 may also include an accelerometer sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0078] The communication component 616 is configured to facilitate communication, wired or wirelessly, between the apparatus 600 and other devices. The apparatus 600 can access a wireless network based on a communication standard, such as WIFI, 2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component 616 receives a broadcast signal or broadcast associated information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 616 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on a Radio Frequency Identification (RFID) technology, an Infrared Data Association (IrDA) technology, an Ultra-Wideband (UWB) technology, a Bluetooth (BT) technology, and other technologies.

[0079] In exemplary embodiments, the apparatus 600 may be implemented with one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components, for performing the above described methods.

[0080] In exemplary embodiments, a non-temporary computer-readable storage medium including instructions, such as the memory 604 including instructions, executable by the processor 620 in the apparatus 600, for performing the above-described method. For example, the non-temporary computer-readable storage medium may be an ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

[0081] The processor 620 may be configured to:

determine a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by a UAV; and

send the data to be transmitted through the transmission link.



[0082] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the description and practice of the disclosure disclosed here. This application is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the disclosure as come within known or customary practice in the art. It is intended that the description and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

[0083] It will be appreciated that the disclosure is not limited to the exact construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. It is intended that the scope of the disclosure only be limited by the appended claims.


Claims

1. A method for data transmission, comprising:

determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a Wireless-Fidelity (WIFI) network accessed by an unmanned aerial vehicle; and

sending the data to be transmitted through the transmission link.


 
2. The method according to claim 1, wherein determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the unmanned aerial vehicle comprises:

in a case that the signal strength of the WIFI network is higher than a first strength threshold, determining a first link corresponding to the WIFI network as the transmission link; or

in a case that the signal strength of the WIFI network is lower than a first strength threshold and higher than a second strength threshold, and the signal strength of the mobile network is higher than a third strength threshold and not higher than a fourth strength threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or

in a case that the signal strength of the WIFI network is lower than a second strength threshold and the signal strength of the mobile network is higher than a fourth strength threshold, determining the second link corresponding to the mobile network as the transmission link.


 
3. The method according to claim 2, wherein the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold are set by a base station; or,
the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold are set by an unmanned aerial vehicle controller.
 
4. The method according to claim 1, wherein determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the unmanned aerial vehicle further comprises:

in a case that a volume of the data to be transmitted is greater than a first volume threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or

in a case that a volume of the data to be transmitted is not greater than a first volume threshold, comparing the signal strength of the mobile network with the signal strength of the WIFI network;

in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or

in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link.


 
5. The method according to claim 2 or 4, wherein sending the data to be transmitted through the transmission link comprises:

dividing the data to be transmitted into two groups of data according to a predetermined ratio, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link; and

sending one of the two groups of data to a unmanned aerial vehicle controller through the first link, and sending the other group of data to a base station through the second link to forward the other group of data by the base station to the unmanned aerial vehicle controller.


 
6. The method according to claim 5, wherein the predetermined ratio is set by the unmanned aerial vehicle controller.
 
7. An apparatus for data transmission, comprising:

a determination module configured to determine, based on signal strengths of a mobile network and a WIFI network accessed by an unmanned aerial vehicle, a transmission link for data to be transmitted; and

a sending module configured to send the data to be transmitted through the transmission link.


 
8. The apparatus according to claim 7, wherein the determination module comprises:

a first determination sub-module configured to, in a case that the signal strength of the WIFI network is higher than a first strength threshold, determine a first link corresponding to the WIFI network as the transmission link;

a second determination sub-module configured to, in a case that the signal strength of the WIFI network is lower than the first strength threshold and higher than a second strength threshold and the signal strength of the mobile network is higher than a third strength threshold and not higher than a fourth strength threshold, determine the first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; and

a third determination sub-module configured to, in a case that the signal strength of the WIFI network is lower than the second strength threshold and the signal strength of the mobile network is higher than the fourth strength threshold, determine the second link corresponding to the mobile network as the transmission link.


 
9. The apparatus according to claim 8, wherein the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold are set by a base station; or,
the first strength threshold, the second strength threshold, the third strength threshold and the fourth strength threshold are set by an unmanned aerial vehicle controller.
 
10. The apparatus according to claim 7, wherein the determination module further comprises:

a fourth determination sub-module configured to, in a case that a volume of the data to be transmitted is greater than a first volume threshold, determine a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link;

a comparison sub-module configured to, in a case that the volume of the data to be transmitted is not greater than the first volume threshold, compare the signal strength of the mobile network with the signal strength of the WIFI network;

a fifth determination sub-module configured to, in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determine the second link corresponding to the mobile network as the transmission link; and

a sixth determination sub-module configured to, in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determine the first link corresponding to the WIFI network as the transmission link.


 
11. The apparatus according to claim 8 or 10, wherein the sending module comprises:

a division sub-module configured to, in a case that the first link corresponding to the WIFI network and the second link corresponding to the mobile network are determined as the transmission link, divide the data to be transmitted into two groups of data according to a predetermined ratio;

a first sending sub-module configured to send one of the two groups of data to a unmanned aerial vehicle controller through the first link; and

a second sending sub-module configured to send the other group of data to the base station through the second link to forward the other group of data by the base station to the unmanned aerial vehicle controller.


 
12. The apparatus according to claim 11, wherein the predetermined ratio is set by the unmanned aerial vehicle controller.
 
13. An unmanned aerial vehicle, comprising:

a processor; and

a memory configured to store instructions executable by a processor,

wherein the processor is configured to:

determine a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by the unmanned aerial vehicle; and

send the data to be transmitted through the transmission link.


 
14. A non-temporary computer-readable storage medium, having computer instructions stored thereon that, when executed by a processor, implement operations of:

determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a WIFI network accessed by an unmanned aerial vehicle; and

sending the data to be transmitted through the transmission link.


 




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