WO2016154934A1 - D2d系统中设备之间的发现方法、装置及系统 - Google Patents

D2d系统中设备之间的发现方法、装置及系统 Download PDF

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Publication number
WO2016154934A1
WO2016154934A1 PCT/CN2015/075611 CN2015075611W WO2016154934A1 WO 2016154934 A1 WO2016154934 A1 WO 2016154934A1 CN 2015075611 W CN2015075611 W CN 2015075611W WO 2016154934 A1 WO2016154934 A1 WO 2016154934A1
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sta
identifier
list
broadcast
time
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PCT/CN2015/075611
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English (en)
French (fr)
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吴伟民
赖静
苏宏家
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华为技术有限公司
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Priority to PCT/CN2015/075611 priority Critical patent/WO2016154934A1/zh
Publication of WO2016154934A1 publication Critical patent/WO2016154934A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for discovering devices between devices in a D2D system.
  • D2D communication refers to the technology that devices can communicate directly without going through the core network.
  • the D2D device in the D2D system Before performing D2D communication, the D2D device in the D2D system first needs to determine other D2D devices (which may be referred to as D2D members of the D2D device) in the system that can perform D2D communication with the D2D device, that is, the D2D device in the system. The discovery process is required.
  • the implementation process of the discovery process between the D2D devices is specifically: the base station allocates a dedicated resource for each D2D device, and each D2D device can separately send its own D2D on the dedicated resource allocated by the base station. Discover the signal. If a D2D device detects a D2D discovery signal on a dedicated resource, the D2D device determines that the D2D device that sends the D2D discovery signal can perform D2D communication with the D2D device, that is, the D2D device that sends the D2D discovery signal is the D2D device. D2D member.
  • the invention provides a method, device and system for discovering devices between devices in a D2D system, which can avoid occupying too many resources and thereby improve the throughput of the D2D system.
  • the present invention provides a method for discovering devices between devices in a D2D system, including:
  • the first D2D STA receives the D2D STA list and the resource indication information of the AP broadcast, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is the Corresponding relationship between the time-frequency resources allocated by the second D2D STA, the first D2D STA and the second D2D STA are within the coverage of the AP;
  • the first D2D STA detects the second D2D STA to the AP on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship.
  • the signal strength of the transmitted signal
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA.
  • the first D2D STA according to the identifier of the second D2D STA and the corresponding relationship, in the time corresponding to the identifier of the second D2D STA Detecting, on the frequency resource, a signal strength of the signal sent by the second D2D STA to the AP, including:
  • the first D2D STA detects a signal strength of the signal on the time-frequency resource.
  • the first D2D STA determines that the second D2D STA is the first D2D STA After the D2D member, the method further includes:
  • the first D2D STA If the first D2D STA does not receive the signal sent by the second D2D STA to the AP within a preset time period, the first D2D STA sends a request message to the AP, where the request message is used by the first D2D STA. And sending the downlink message to the second D2D STA, where the downlink message is used to indicate that the second D2D STA sends a response message to the AP;
  • the first D2D STA detects a signal strength of the response message on the time-frequency resource
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA.
  • the D2D STA list further includes an identifier of the first D2D STA
  • the method further includes:
  • the first D2D STA sends an association request frame to the AP, where the association request frame carries a D2D function identifier, where the D2D function identifier is used to represent the first D2D STA as a D2D STA, and the D2D function identifier is used by the D2D function identifier. Instructing the AP to add an identifier of the first D2D STA to the D2D STA list.
  • the present invention provides a method for discovering devices between devices in a D2D system, including:
  • the AP broadcasts a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is allocated to the second D2D STA.
  • the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, where A D2D STA and the second D2D STA are within the coverage of the AP.
  • the method before the AP broadcasts the D2D STA list and the resource indication information, the method further includes:
  • an association request frame sent by the STA where the association request frame carries a D2D function identifier, where the D2D function identifier is used to indicate whether the STA is a D2D STA;
  • the AP determines that the STA is a D2D STA, the AP will use the STA The identity is added to the list of D2D STAs.
  • the D2D STA list includes identifiers of multiple D2D STAs, and the multiple D2D STAs are all D2D STAs within the coverage of the AP, and the first D2D STA and the second D2D STA are the multiple Any two D2D STAs in the D2D STA.
  • the AP broadcasts a list of D2D STAs, including:
  • the AP carries the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the method also includes:
  • the D2D STA list further includes the number of the multiple D2D STAs; or
  • the D2D STA list further includes a quantity and a type identifier of the plurality of D2D STAs, where the type identifier is used to indicate a type of the identifier of the plurality of D2D STAs.
  • the present invention provides a D2D STA, including:
  • a receiving unit configured to receive a D2D STA list and resource indication information that is broadcast by the AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is Second D2D STA allocation Corresponding relationship between the time-frequency resources, the D2D STA and the second D2D STA are within the coverage of the AP;
  • a detecting unit configured to detect the second D2D on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship received by the receiving unit The signal strength of the signal sent by the STA to the AP;
  • a determining unit configured to determine, when the detecting unit detects that the signal strength of the signal is greater than or equal to a preset threshold, determining that the second D2D STA is a D2D member of the D2D STA.
  • the detecting unit is configured to determine, according to the identifier of the second D2D STA and the corresponding relationship, the time-frequency resource corresponding to the identifier of the second D2D STA, where the second D2D STA is in the Transmitting the signal to the AP on a time-frequency resource;
  • the detecting unit is specifically configured to detect a signal strength of the signal on the time-frequency resource.
  • the D2D STA further includes a sending unit
  • the sending unit is configured to: after the determining unit determines that the second D2D STA is a D2D member of the D2D STA, if the receiving unit does not receive the second D2D STA direction within a preset time period And sending, by the AP, a request message to the AP, where the request message is used to request the AP to send a downlink message to the second D2D STA, where the downlink message is used to indicate the second D2D STA Sending a response message to the AP;
  • the detecting unit is further configured to detect a signal strength of the response message on the time-frequency resource
  • the determining unit is further configured to: when the detecting unit detects that the signal strength of the response message is greater than or equal to the preset threshold, determine that the second D2D STA is a D2D member of the D2D STA.
  • the D2D STA list received by the receiving unit further includes the first D2D STA logo
  • the sending unit is further configured to: before the receiving unit receives the D2D STA list and the resource indication information broadcast by the AP, send an association request frame to the AP, where the association request frame carries a D2D function identifier, and the D2D function
  • the identifier is used to indicate that the first D2D STA is a D2D STA
  • the D2D function identifier is used to instruct the AP to add an identifier of the first D2D STA to the D2D STA list.
  • the present invention provides an AP, including:
  • a broadcast unit configured to broadcast a D2D STA list and resource indication information, where the D2D STA list includes an identifier of a second D2D STA, where the resource indication information includes the second D2D STA identifier and an allocation unit is the second D2D Corresponding relationship between the time-frequency resources allocated by the STA, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, The first D2D STA and the second D2D STA are within the coverage of the AP.
  • the AP further includes a receiving unit, a determining unit, and an adding unit, where
  • the receiving unit is configured to: before the broadcast unit broadcasts the D2D STA list and the resource indication information, receive an association request frame sent by the STA, where the association request frame carries a D2D function identifier, where the D2D function identifier is used to represent the Whether the STA is a D2D STA:
  • the determining unit is configured to determine, according to the D2D function identifier received by the receiving unit, whether the STA is a D2D STA;
  • the adding unit is configured to add an identifier of the STA to the D2D STA list if the determining unit determines that the STA is a D2D STA.
  • the D2D STA list broadcast by the broadcast unit includes identifiers of multiple D2D STAs, all of the D2D STAs within the coverage of the AP, the first D2D STA and the second D2D STA is in the plurality of D2D STAs Any two D2D STAs.
  • the broadcast unit is specifically configured to carry the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the AP further includes a sending unit ,
  • the receiving unit is further configured to receive a request message sent by the first D2D STA, where the request message is used to request the sending unit to send a downlink message to the second D2D STA, where the downlink message is used to indicate the The second D2D STA sends a response message to the AP;
  • the sending unit is configured to send the downlink message to the second D2D STA according to the request message received by the receiving unit.
  • the D2D STA list broadcast by the broadcast unit further includes the number of the multiple D2D STAs; or
  • the D2D STA list broadcast by the broadcast unit further includes a quantity and a type identifier of the multiple D2D STAs, where the type identifier is used to indicate a type of the identifier of the multiple D2D STAs.
  • the present invention provides a D2D STA, including:
  • a transceiver configured to receive a D2D STA list and resource indication information that is broadcast by the AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is Corresponding relationship between time-frequency resources allocated by the second D2D STA, where the D2D STA and the second D2D STA are within the coverage of the AP;
  • a processor configured to detect, according to the identifier of the second D2D STA and the corresponding relationship received by the transceiver, a signal strength of a signal sent by the second D2D STA to the AP, when a signal of the signal When the strength is greater than or equal to the preset threshold, determining that the second D2D STA is a D2D member of the D2D STA, and the signal strength of the signal is the received by the transceiver on the time-frequency resource. The signal strength of the signal.
  • the processor is configured to determine the time-frequency resource according to the identifier of the second D2D STA and the corresponding relationship, where the second D2D STA sends the to the AP on the time-frequency resource. signal;
  • the processor is specifically configured to detect a signal strength of the signal received by the transceiver on the time-frequency resource.
  • the transceiver is further configured to: after the processor determines that the second D2D STA is a D2D member of the D2D STA, if the transceiver does not receive the signal within a preset time period, The AP sends a request message, where the request message is used to request the AP to send a downlink message to the second D2D STA, where the downlink message is used to instruct the second D2D STA to send a response message to the AP;
  • the processor is further configured to detect a signal strength of the response message received by the transceiver on the time-frequency resource, and when the signal strength of the response message is less than the preset threshold, determine The second D2D STA is not a D2D member of the D2D STA.
  • the transceiver is further configured to: before receiving the D2D STA list and the resource indication information broadcast by the AP, send an association request frame to the AP, where the association request frame carries a D2D function identifier, where the D2D function identifier is used for characterization
  • the first D2D STA is D2D STA.
  • the present invention provides an AP, including:
  • a transceiver configured to broadcast a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, the resource indication information includes the second D2D STA identifier, and the processor is the second D2D Corresponding relationship between the time-frequency resources allocated by the STA, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, The first D2D STA and the second D2D STA are within the coverage of the AP.
  • the transceiver is further configured to: before the D2D STA list and the resource indication information are broadcasted, receive an association request frame sent by the STA, where the association request frame carries a D2D function identifier, where the D2D function identifier is used to identify whether the STA is For D2D STA;
  • the processor is configured to determine, according to the D2D function identifier received by the transceiver, whether the STA is a D2D STA;
  • the processor is further configured to add an identifier of the STA to the D2D STA list if the STA is a D2D STA.
  • the D2D STA list broadcast by the transceiver includes identifiers of multiple D2D STAs, all of the D2D STAs within the coverage of the AP, the first D2D STA and the second D2D
  • the STA is any two of the plurality of D2D STAs.
  • the transceiver is specifically configured to carry the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the transceiver is further configured to receive a request message sent by the first D2D STA, where the request message is used to request the transceiver to send a downlink message to the second D2D STA, where the downlink message is used to indicate the The second D2D STA sends a response message to the AP;
  • the transceiver is further configured to send the downlink message to the second D2D STA according to the request message.
  • the D2D STA list broadcast by the transceiver further includes the number of the multiple D2D STAs; or
  • the D2D STA list broadcast by the transceiver further includes a quantity and a type identifier of the multiple D2D STAs, where the type identifier is used to indicate a type of the identifier of the multiple D2D STAs.
  • the present invention provides a communication system, including:
  • the D2D STA according to any one of the foregoing possible implementation manners of the third aspect or the third aspect, and the AP of any one of the foregoing possible implementation manners of the fourth aspect or the fourth aspect; or
  • the D2D STA according to any one of the foregoing possible implementation manners of the fifth aspect or the fifth aspect, and the AP described in any one of the foregoing sixth aspect or the sixth aspect.
  • the invention provides a method, a device and a system for discovering between devices in a D2D system, which may include a D2D STA list and resource indication information that the first D2D STA receives the AP broadcast, and the D2D STA list includes the identifier of the second D2D STA, the resource.
  • the indication information includes a correspondence between the second D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA, where the first D2D STA is in accordance with the identifier of the second D2D STA and the corresponding relationship, and the identifier of the second D2D STA.
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA, wherein the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the present invention provides a method, an apparatus, and a system for discovering between devices in a D2D system.
  • the first D2D STA can determine that the second D2D STA is a D2D STA according to the D2D STA list broadcast by the AP, and detect the second D2D STA to the AP.
  • the frequency resource is used for the second D2D STA to send the D2D discovery signal, thereby avoiding occupying excessive time-frequency resources, thereby improving the throughput of the D2D system.
  • FIG. 1 is a flowchart of a method for discovering devices between devices in a D2D system according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for discovering devices between devices in a D2D system according to an embodiment of the present invention
  • FIG. 3 is an interaction diagram of a method for discovering devices between devices in a D2D system according to an embodiment of the present disclosure
  • FIG. 4 is a flowchart of an algorithm for changing a period of a broadcast D2D STA list according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a D2D STA according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a D2D STA according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of an AP according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of an AP according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an AP according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of hardware of a D2D STA according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of hardware of an AP according to an embodiment of the present disclosure.
  • FIG. 12 is a block diagram of a communication system according to an embodiment of the present invention.
  • the AP has a D2D function, and the AP also has a scheduling function, that is, the AP can unify the STA that currently applies for the uplink time-frequency resource in the WiFi system applicable to the discovery method, device, and system in the D2D system provided by the present invention.
  • Scheduling, and performing centralized indication on the resource allocation information of the application for uplink time-frequency resources in the resource allocation information (English: resource allocation), and the broadcast resource indication information. Therefore, each STA in the coverage of the AP can learn the resource allocation status of other STAs according to the resource indication information.
  • the D2D STA refers to a STA having a D2D function
  • the normal STA refers to an STA that does not have a D2D function
  • An embodiment of the present invention provides a method for discovering devices between devices in a D2D system. As shown in FIG. 1 , the method may include:
  • the first D2D STA receives the D2D STA list and the resource indication information of the AP broadcast, where the D2D STA list includes the identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the time frequency allocated by the AP to the second D2D STA. Correspondence between resources, the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the D2D STA list broadcasted by the AP received by the first D2D STA includes the identifiers of all D2D STAs in the coverage area of the AP, that is, the identifiers of all D2D STAs served by the AP.
  • First D2D STA and second D2D STA Any two of all D2D STAs within the coverage of the AP.
  • the D2D STA list is used to notify each D2D STA in the coverage of the AP, and the identifier of all D2D STAs in the coverage area of the AP, that is, each D2D STA is notified, and which STAs are covered by the AP. It is a D2D STA, so that each D2D STA can determine from which STAs its D2D members can be determined.
  • the AP broadcasted by the first D2D STA includes at least the correspondence between the identifier of the second D2D STA and the time-frequency resource allocated by the AP to the second D2D STA.
  • the resource indication information may also include a correspondence between the identifiers of other D2D STAs in the coverage of the AP and the time-frequency resources allocated by the APs to other D2D STAs, and the resource indication information may also include the coverage of the AP.
  • the correspondence between the identifier of the normal STA and the AP is the time-frequency resource allocated by the ordinary STA.
  • the first D2D STA detects, according to the identifier of the second D2D STA and the corresponding relationship, the signal strength of the signal sent by the second D2D STA to the AP on the time-frequency resource corresponding to the identifier of the second D2D STA.
  • the second D2D STA may be determined to be a D2D STA, so that the first D2D STA may further detect the signal sent by the second D2D STA to the AP, to Determine whether the second D2D STA is its D2D member.
  • the foregoing S102 may include:
  • the first D2D STA determines, according to the identifier of the second D2D STA and the corresponding relationship, a time-frequency resource corresponding to the identifier of the second D2D STA.
  • the time-frequency resource is a time-frequency resource allocated by the AP to the second D2D STA, and the second D2D STA sends a signal to the AP on the time-frequency resource.
  • the first D2D STA may be configured according to the first D2D STA, because the resource indication information includes a correspondence between the identifier of the second D2D STA and the time-frequency resource.
  • the identifier of the second D2D STA and the corresponding relationship determine the time-frequency resource.
  • the first D2D STA detects the signal strength of the signal on the time-frequency resource.
  • the first D2D STA can detect the signal on the time-frequency resource. Therefore, the first D2D STA detects the signal strength of the signal on the time-frequency resource, which can be understood as the first D2D STA detecting the first D2D.
  • the signal strength of the signal received by the STA on the time-frequency resource may be that the first D2D STA detects the received power of the signal received by the first D2D STA on the time-frequency resource.
  • the first D2D STA determines the time-frequency resource according to the identifier of the second D2D STA and the corresponding relationship, the first D2D STA It can be determined that the signal received on the time-frequency resource is the signal sent by the second D2D STA to the AP.
  • the signal strength of the signal detected by the first D2D STA on the time-frequency resource is that the first D2D STA detects the signal strength of the signal sent by the second D2D STA to the AP.
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA.
  • the preset threshold value may be set to the lowest receiving sensitivity of the corresponding minimum modulation coding mode (English: modulation and coding scheme, abbreviation: MCS) under the D2D communication power control condition, that is, the D2D communication between the devices can be ensured.
  • MCS modulation and coding scheme
  • the minimum receiving sensitivity that interferes with primary link communication can also be set according to the needs of the actual project. For example, it can be set according to the communication quality requirement between the D2D STAs.
  • each D2D STA in the coverage of the AP may serve as the first D2D STA and perform the method described in the foregoing S101-S103, and all D2D STAs in the coverage area of the AP.
  • the other D2D STAs other than the first D2D STA are all the second D2D STAs relative to the first D2D STA, and the first D2D STA may detect the signal strength of the signal sent by each second D2D STA to the AP, thereby Other D2D STAs are identified in their D2D members.
  • An embodiment of the present invention provides a method for discovering devices in a D2D system.
  • the method may be that the first D2D STA receives the D2D STA list and the resource indication information broadcast by the AP, where the D2D STA list includes the identifier of the second D2D STA, and the resource.
  • Instructions include Corresponding relationship between the second D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA, the first D2D STA according to the identifier of the second D2D STA and the corresponding relationship, when corresponding to the identifier of the second D2D STA The signal strength of the signal sent by the second D2D STA to the AP is detected on the frequency resource.
  • the first D2D STA determines that the second D2D STA is the D2D member of the first D2D STA.
  • the AP provides services for the first D2D STA and the second D2D STA.
  • the first D2D STA can determine that the second D2D STA is a D2D STA according to the D2D STA list broadcast by the AP, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is greater than or equal to a preset.
  • the first D2D STA may determine that the second D2D STA is a D2D member, and the AP does not need to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D discovery signal, thereby avoiding Occupy too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • An embodiment of the present invention provides a method for discovering devices in a D2D system. As shown in FIG. 2, the method may include:
  • the AP broadcasts the D2D STA list and the resource indication information, where the D2D STA list includes the identifier of the second D2D STA, where the resource indication information includes a correspondence between the second D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA.
  • the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, and the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the D2D STA broadcast by the AP may include not only the identifier of one second D2D STA, but the D2D STA list broadcast by the AP may include identifiers of multiple D2D STAs.
  • the plurality of D2D STAs are all D2D STAs within the coverage of the AP, that is, the plurality of D2D STAs are all D2D STAs served by the AP.
  • the first D2D STA and the second D2D STA are any two D2D STAs of the multiple D2D STAs.
  • first D2D STA refers to the first D2D STA in the embodiment shown in FIG. 1
  • second D2D STA refers to the second D2D STA in the embodiment shown in FIG. 1 , which can be seen in FIG. 1 . Correlation between the first D2D STA and the second D2D in the embodiment Description, no longer repeat here.
  • the identifier of the D2D STA may be the ID of the D2D STA. Therefore, the D2D STA list may include IDs of all D2D STAs in the coverage of the AP. For example, it is assumed that there are 20 D2D STAs in the AP coverage, and the IDs of the 20 D2D STAs are D2D STA1 and D2D STA2, respectively. , ..., D2D STA19, D2D STA20, then the D2D STA list can be as shown in Table 1.
  • the D2D STA list may further include the number of D2D STAs in the coverage of the AP.
  • the D2D STA list may be as shown in Table 2.
  • the D2D STA list may further include a quantity of the D2D STA in the coverage of the AP, a type identifier, and an identifier of the D2D STA, where the type identifier is used to indicate the type of the identifier of the D2D STA.
  • the type identifier may be represented by two bits. Specifically, when the assignment of the two bits is different, the identifier of the D2D STA in the D2D STA list is also characterized in different manners. .
  • the identifier of the D2D STA is characterized in a bitmap manner. Specifically, it is assumed that the AP can access L STAs at the same time, that is, the AP can provide services for L STAs at the same time, and the length of the field used for recording the identifier of the D2D STA is L, that is, the field has a total of L bits.
  • the field of length L is a bitmap.
  • the AP allocates one bit in the bitmap for all STAs in its coverage. When a certain bit position is 0, it indicates that the STA corresponding to the bit is a normal STA, and when the bit position is 1, it indicates that the STA corresponding to the bit is a D2D STA.
  • the first bit corresponds to STA 1
  • the second bit corresponds to STA2
  • the third bit corresponds to STA3
  • the fourth bit corresponds to STA4
  • the fifth bit corresponds to STA5
  • the sixth bit Bit corresponds to STA6, ....
  • the assignment value of the field is 000110...
  • the STA1, STA2, STA3, and STA6 are represented as ordinary STAs.
  • STA4 and STA5 are D2D STAs and the like.
  • the identifier of the D2D STA may be characterized by using a bitmap, for example, when the number of D2D STAs in the coverage of the AP is greater than 128, The identifier of the D2D STA is indicated in a bitmap manner.
  • the threshold for determining whether the number of D2D STAs in the coverage area of the AP is large may be designed according to actual engineering requirements, and is not limited herein.
  • the D2D STA is the ID of the D2D STA, and the ID of the D2D STA is recorded in an offset manner.
  • the length of the field for recording the identifier of the D2D STA may be less than L.
  • the first n bits can be assigned the ID of the first D2D STA, and the m bits after the first n bits are an offset field.
  • the STA is a D2D STA, and the ID of the D2D STA is the ID of the previous STA plus the assignment in the offset field.
  • the offset field Indicates that the STA is a normal STA, and the ID of the normal STA is the ID of the previous STA plus the power of 2 and the second is further reduced by 1.
  • the ID of the D2D STA may be recorded in an offset manner.
  • the ID of the D2D STA is the ID of the D2D STA, and each n bits represent the ID of one D2D STA.
  • the ID of STA11, the second 8 bits 00100000 is the ID of D2D STA32.
  • the actual length of the field for recording the identifier of the D2D STA is the product of the number of D2D STAs and n, and the actual length is less than L. Specifically, it is used when the number of D2D STAs is less than L/n and the ID interval of the D2D STA is large.
  • the identifier of the D2D STA may be indicated by other means.
  • the D2D STA list may be as shown in Table 3, wherein the number of D2D STAs is 5, the type identifier is 01, and the IDs of the 5 D2D STAs are 11 (ie, 000010110), 32 (ie, 0100000), 3 (ie 00000011), 48 (ie 00110000), 33 (ie 00100001).
  • the embodiment of the present invention provides a method for discovering between devices in a D2D system, where the method may broadcast a D2D STA list and resource indication information for an AP, where the D2D STA list includes an identifier of the second D2D STA, and the resource indication information includes the second
  • the correspondence between the D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is the D2D of the first D2D STA.
  • the member, the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the first D2D STA After the first D2D STA receives the D2D STA list broadcast by the AP, it can determine that the second D2D STA is a D2D STA, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal
  • the first D2D STA may determine that the second D2D STA is a D2D member, and the AP does not need to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D.
  • the signal is found to avoid consuming too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • An embodiment of the present invention provides a method for discovering devices between devices in a D2D system. As shown in FIG. 3, the method may include:
  • the first D2D STA sends an association request (English: association request) frame to the AP.
  • the STA when the STA sends an association request frame to the AP to request access to the AP, the STA may carry a D2D function identifier in the association request frame, where the D2D function identifier is used for characterization. Whether the STA is a D2D STA.
  • a D2D function identifier of one bit may be added in an extended capability field in the association request frame, and when the bit value is 1, the STA is represented as a D2D STA, when the bit is When the bit is assigned 0, the STA is characterized as a normal STA.
  • the D2D function identifier carried in the association request frame sent by the first D2D STA to the AP represents the first D2D STA bit and one D2D STA.
  • the AP After receiving the association request frame, the AP determines, according to the D2D function identifier carried in the association request, that the first D2D STA is a D2D STA.
  • the AP adds the identifier of the first D2D STA to the D2D STA list.
  • the AP broadcasts a D2D STA list.
  • the AP may carry the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the management control broadcast frame has a fixed broadcast period. Therefore, in the embodiment of the present invention, the predetermined management control broadcast frame refers to a management control broadcast frame broadcasted in a predetermined broadcast period.
  • the AP may carry the D2D STA list in the management control broadcast frame broadcasted in each broadcast period. That is, it can be understood that the period in which the AP broadcasts the D2D STA list is the same as the broadcast period of the AP broadcast management control broadcast frame.
  • the AP may carry the D2D STA list in the management control broadcast frame broadcasted every M broadcast periods.
  • the AP carries the D2D STA list in the management control broadcast frame broadcasted in the first broadcast period, the AP does not in the management control broadcast frame broadcasted in 2, 3, or 4 broadcast periods. Carrying the D2D STA list, the AP carries the D2D STA list in the management control broadcast frame broadcasted in the fifth broadcast period. AP broadcast D2D The period of the STA list is M+1 times of the above broadcast period.
  • the management control broadcast frame carrying the D2D STA list may be determined in real time according to the preset algorithm, that is, the period of the broadcast D2D STA list is changed in real time according to a preset algorithm.
  • the fixed broadcast period of the foregoing management control broadcast frame may be represented as T
  • the period of the broadcast D2D STA list may be represented as T d
  • the time when the new D2D STA requests to access the AP last time Can be expressed as Tpre
  • the time of the last cycle change can be expressed as Tchang.
  • the algorithm may include:
  • the period change valve can be expressed as Tag
  • N 0
  • the maximum period of the broadcast D2D STA list can be expressed as T dmax .
  • the AP determines whether a new D2D STA requests access, and if so, executes S23, and if no, returns to S22.
  • the AP broadcasts the D2D STA list in the broadcast period of the broadcast management control broadcast frame, that is, the AP carries the D2D STA list in the management control broadcast frame broadcasted in each broadcast period.
  • the AP determines whether a new D2D STA requests access, and determines whether the difference between the current time and the Tpre is greater than or equal to the tag. If the AP determines that a new D2D STA requests access, the process returns to S23 and re-executes; if the AP determines that there is no If the new D2D STA requests access, and the difference between the current time and the Tpre is less than the Tag, the process returns to S24 to re-execute; if the AP determines that no new D2D STA requests access, and the difference between the current time and the Tpre is greater than or equal to the Tag, the execution is performed. S25.
  • the AP carries the D2D STA list in the management control broadcast frame broadcasted every N-1 broadcast periods, that is, the AP broadcasts N management control broadcast frames, only one
  • the management control broadcast frame carries the D2D STA list.
  • the AP determines whether a new D2D STA requests access, determines whether the difference between the current time and the Tpre is greater than or equal to the tag, and determines whether the N is equal to A. If the AP determines that a new D2D STA requests access, returns to the S23.
  • Re-execution if the AP determines that no new D2D STA requests access, and the difference between the current time and Tpre is greater than or equal to Tag, and T d ⁇ T dmax , then S25 is performed; if the AP determines that no new D2D STA requests access, And the difference between the current time and Tpre is less than Tag, and T d ⁇ T dmax , then return to S26 for re-execution; if the AP determines T d ⁇ T dmax , then S27 is performed.
  • T d when T d ⁇ T dmax, a cycle of T dmax places broadcast D2D STA list.
  • the AP determines whether there is any, and if so, executes S23, and if not, executes S28.
  • the AP keeps broadcasting the D2D STA list in a period of T dmax .
  • the D2D STA list is carried in the management control broadcast frame broadcasted in each broadcast period, thereby timely notifying the AP coverage.
  • the original D2D STA has a new D2D STA accessing the AP, so that the original D2D STA can timely determine whether the new D2D STA is its D2D member.
  • the D2D STAs in the coverage of the AP are also notified in time to enable the new D2D STA to determine its own D2D members from the original D2D STAs in time.
  • the period of broadcasting the D2D STA list may be gradually incremented until no new D2D STA requests access, until the maximum period is incremented, and the D2D STA list is broadcasted at the maximum period, thereby saving the broadcast D2D STA list. Resources consumed.
  • the above-mentioned management control broadcast frame is a beacon frame in the WiFi system
  • the AP carries the D2D list information in the Beacon frame broadcasted in the next broadcast period. That is, the AP carries the D2D list information in the Beacon frame broadcasted by one Beacon_Interval.
  • T d is no longer incremented, and the D2D STA list is broadcasted in a period of 10*Beacon_Interval. It can be understood that only 10 Beacon frames are broadcast.
  • a beacon frame carries D2D list information.
  • the AP broadcasts the resource indication information, where the resource indication information includes a correspondence between the second D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA.
  • the first D2D STA After receiving the D2D STA list and the resource indication information, the first D2D STA determines that the AP is a time-frequency resource allocated by the second D2D STA.
  • the second D2D STA After receiving the resource indication information, the second D2D STA sends a signal to the AP on the time-frequency resource.
  • the first D2D STA receives, on the time-frequency resource, a signal that is sent by the second D2D STA to the AP.
  • the foregoing S307 may be performed before the foregoing S306, or may be performed simultaneously with the foregoing S308, that is, the second D2D STA is also received by the first D2D STA while transmitting a signal to the AP.
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA.
  • the first D2D STA maintains a D2D member set, where the D2D member set includes an identifier of a D2D member of the first D2D STA determined by the first D2D STA.
  • the first D2D STA After the first D2D STA detects that the signal strength of the signal is greater than or equal to the preset threshold, if the first D2D STA determines that the identifier of the second D2D STA already belongs to the D2D member set, the first D2D STA does not perform related processing. . And if the first D2D STA determines that the identifier of the second D2D STA does not belong to the D2D member set, the first D2D STA adds the identifier of the second D2D STA to the D2D member set.
  • the first D2D STA determines that the second D2D STA is not a D2D member of the first D2D STA.
  • the first D2D STA After the first D2D STA detects that the signal strength of the signal is less than the preset threshold, if the first D2D STA determines that the identifier of the second D2D STA belongs to the D2D member set, the first D2D STA identifies the second D2D STA. Remove from the mid-term of the D2D member set. If the first D2D STA determines that the identifier of the second D2D STA does not belong to the D2D member set, the first D2D STA does not perform related processing.
  • both the first D2D STA and the D2D member of the first D2D STA may be in a moving state, when the distance between the first D2D STA and a certain D2D member of the first D2D STA is too far
  • the signal strength of the signal sent by the D2D member that the first D2D STA can receive may not satisfy the requirement for communication between the first D2D STA and its D2D member. Even the first D2D STA may not receive the signal sent by the D2D member.
  • the D2D member may also be in a dormant state, that is, the D2D member of the first D2D STA does not send a signal to the AP, so that the first D2D STA cannot detect the signal strength of the signal sent by the D2D member.
  • the first D2D STA cannot Determining that the D2D member is due to a mobile relationship, causing the distance between the first D2D STA and the D2D member to be too far, and the D2D member is no longer suitable as the D2D member of the first D2D STA, or because the D2D member is only sleeping. State, but still in the vicinity of the first D2D STA.
  • embodiments of the present invention provide a method to avoid the above situation.
  • the second D2D STA is a D2D member of the first D2D STA.
  • the first D2D STA If the first D2D STA does not receive the signal sent by the second D2D STA to the AP within the preset time period, the first D2D STA sends a request message to the AP, where the request message is used to request the AP to send the message to the second D2D STA. Downstream message.
  • the AP After receiving the request message, the AP sends the downlink message to the second D2D STA according to the request message, where the downlink message is used to instruct the second D2D STA to send a response message to the AP.
  • the AP before transmitting the downlink message to the second D2D STA, the AP also broadcasts the resource indication information, where the resource indication information includes the identifier of the second D2D STA and the AP is the second D2D STA.
  • the first D2D STA detects a signal strength of the response message on the time-frequency resource.
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA.
  • the first D2D STA determines that the D2D communication is not suitable for the second D2D STA, and the identifier of the second D2D STA is first from the first The D2D STA maintains its D2D member set removed.
  • the second D2D STA When the signal strength of the response message is greater than or equal to the preset threshold, it indicates that the second D2D STA is in a sleep state within the preset time period.
  • the second D2D STA is still a D2D member of the first D2D STA.
  • the first D2D STA determines whether a second D2D STA is a D2D member thereof, and a method for discovering between devices in the D2D system provided by the embodiment of the present invention is described. Understandably, when After the first D2D STA receives the D2D STA list, the first D2D STA needs to determine each second D2D STA in the D2D STA list.
  • the first D2D STA may determine the second D2D STA set in the coverage of the AP, that is, all the D2D STAs except the first D2D STA in the AP coverage range. set. Further, the first D2D STA starts to periodically detect the second D2D STA set to determine a D2D member set of the first D2D STA from the second D2D STA set.
  • the manner in which the first D2D STA periodically detects the second D2D STA set is as follows (method 1 and mode 2).
  • the first D2D STA can start with the T_dis cycle, and the first D2D STA can start to use the T_dis cycle. Two D2D STA sets are detected.
  • the first D2D STA when the first D2D STA receives the first resource indication information, the first D2D STA starts the D2D discovery timer, and starts to use the identifier of the second D2D STA included in the resource indication information.
  • the corresponding relationship between the time-frequency resources allocated by the AP to the second D2D STA hereinafter referred to as the correspondence relationship of the second D2D STAs), detecting the signal strength of the signal received by the first D2D STA on the time-frequency resource, to determine the Whether the second D2D STA is a D2D member of the first D2D STA.
  • the first resource indication information may include only the correspondence between one or a plurality of second D2D STAs in the second D2D STA set.
  • the first D2D STA may receive multiple resource indication information during the time period of the D2D discovery timer, and the first D2D STA needs to select a part of the second D2D included in the resource indication information received in the timed period.
  • the signal strength of the signal sent by the second D2D STA is detected.
  • the D2D discovery timer may be a positive timer or a countdown timer.
  • the first D2D STA may stop detecting within the period; otherwise, the first D2D STA continues to detect during the timing period.
  • a smaller detection period and a larger detection period can be preset.
  • the smaller detection period can be expressed as T_dis_min
  • the larger detection period can be expressed as T_dis_max.
  • the D2D member set maintained by the first D2D STA is the first set. It can be understood that the first set belongs to the first D2D STA according to the received D2D STA. A second set of D2D STAs determined by the list.
  • the first D2D STA may detect the second D2D STA in the first set by using T_dis_min as a period, and detect the second D2D STAs in time, and identify the second D2D STAs. Remove from the first collection.
  • the first D2D STA may detect the second D2D STA that belongs to the second D2D STA set but does not belong to the first set by using T_dis_max as a period.
  • the first D2D STA can also detect the newly added second D2D STA by using the T_dis_min period to detect whether the newly added second D2D STA can As a D2D member of the first D2D STA.
  • the first D2D STA determines whether the second D2D STA is a D2D member according to the received D2D STA list and the resource indication information. Detailed explanation.
  • the identifiers of the plurality of second D2D STAs determined by the first D2D STA according to the received D2D STA list are respectively STA1, STA3, STA5, and the like.
  • a certain resource indication information received by the first D2D STA includes a correspondence relationship of three STAs. Among them, the The identifiers of the three STAs are STA1, STA2, and STA3, respectively.
  • the time-frequency resource allocated by the AP to the STA1 is the RB of the label 1-15
  • the time-frequency resource allocated by the AP to the STA2 is the RB of the label 16-23
  • the time-frequency resource allocated by the AP to the STA3 is the RB of the label 24-31.
  • STA1 and STA3 in the resource indication information are the second D2D STA, so that the first D2D STA can detect the signals sent by the STA1 and the STA3 to the AP respectively.
  • the first D2D STA determines, according to STA1, that the AP is a time-frequency resource allocated by STA1, and then the first D2D STA detects a signal on the time-frequency resource.
  • the first D2D may detect the signal strength of the signal on any one of the RBs labeled 1-15, and may also detect the signal strength of the signal on multiple or all of the RBs labeled 1-15.
  • the average value is not limited in the embodiment of the present invention.
  • the first D2D STA determines that STA 1 is its D2D member. Further, if the first D2D STA determines that the STA1 already belongs to the D2D member set of the first D2D STA, the first D2D STA does not perform a related operation. If the first D2D STA determines that STA1 does not belong to the D2D member set of the first D2D STA, the first D2D STA adds STA1 to its D2D member set.
  • the first D2D STA determines that STA1 is not its D2D member. Further, if the first D2D STA determines that the STA1 already belongs to the D2D member set of the first D2D STA, the first D2D STA deletes the STA1 from its D2D member set. If the first D2D STA determines that STA1 does not belong to the D2D member set of the first D2D STA, the first D2D STA does not perform a related operation.
  • the first D2D STA determines that the first D2D STA updates its maintained D2D member set, that is, the first D2D STA determines that the D2D member combination is performed.
  • the add and/or delete operation may be performed by the first D2D STA to send the updated D2D member set to the AP, so that the AP can allocate reasonable time-frequency resources for D2D communication between the first D2D STA and the D2D member.
  • the embodiment of the present invention provides a method for discovering between devices in a D2D system, where the first D2D STA can receive a D2D STA list and a resource indication message broadcast by the AP.
  • the D2D STA list includes the identifier of the second D2D STA, where the resource indication information includes a correspondence between the second D2D STA identifier and the time-frequency resource allocated by the AP to the second D2D STA, and the first D2D STA is configured according to the second D2D STA.
  • the first D2D STA determines that the second D2D STA is a D2D member of the first D2D STA, wherein the AP provides services for the first D2D STA and the second D2D STA.
  • the first D2D STA can determine that the second D2D STA is a D2D STA according to the D2D STA list broadcast by the AP, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is greater than or equal to a preset.
  • the first D2D STA may determine that the second D2D STA is a D2D member, and the AP does not need to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D discovery signal, thereby avoiding Occupy too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • an embodiment of the present invention provides a D2D STA, which may include:
  • the receiving unit 10 is configured to receive a D2D STA list and resource indication information that is broadcast by the AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is Corresponding relationship between the time-frequency resources allocated by the second D2D STA, the D2D STA and the second D2D STA are within the coverage of the AP.
  • the detecting unit 11 is configured to detect the second D2D on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship received by the receiving unit 10 The signal strength of the signal sent by the STA to the AP.
  • the determining unit 12 is configured to determine, when the detecting unit 11 detects that the signal strength of the signal is greater than or equal to a preset threshold, determining that the second D2D STA is a D2D member of the D2D STA.
  • the detecting unit 11 is configured to determine, according to the identifier of the second D2D STA and the corresponding relationship, a location corresponding to the identifier of the second D2D STA.
  • the time-frequency resource, the second D2D STA sends the signal to the AP on the time-frequency resource;
  • the detecting unit 11 is specifically configured to detect a signal strength of the signal on the time-frequency resource.
  • the D2D STA further includes a sending unit 13.
  • the sending unit 13 is configured to: after the determining unit 12 determines that the second D2D STA is a D2D member of the D2D STA, if the receiving unit 10 does not receive the second in a preset time period
  • the signal sent by the D2D STA to the AP sends a request message to the AP, where the request message is used to request the AP to send a downlink message to the second D2D STA, where the downlink message is used to indicate the
  • the two D2D STA sends a response message to the AP.
  • the detecting unit 11 is further configured to detect a signal strength of the response message on the time-frequency resource.
  • the determining unit 12 is further configured to: when the detecting unit 11 detects that the signal strength of the response message is greater than or equal to the preset threshold, determine that the second D2D STA is the D2D of the D2D STA member.
  • the D2D STA list received by the receiving unit 10 further includes an identifier of the first D2D STA
  • the sending unit 13 is further configured to receive, by the receiving unit 10, a D2D STA list broadcast by an AP.
  • the AS sends an association request frame to the AP, where the association request frame carries a D2D function identifier, where the D2D function identifier is used to represent the first D2D STA as a D2D STA, and the D2D function identifier is used by the D2D function identifier. Instructing the AP to add an identifier of the first D2D STA to the D2D STA list.
  • the D2D STA provided by the embodiment of the present invention refers to the first D2D STA in the embodiment shown in FIG. 1, FIG. 3 and FIG. 4, and can be executed as shown in FIG. 1, FIG. 3, and FIG. The method flow shown.
  • the D2D STA may be a communication device with D2D function.
  • the D2D STA may be a mobile station with D2D function (English: Mobile Station), personal computer (English: Personal Computer), laptop (English: Laptop Computer), tablet (English: Tablet Computer), netbook (English: Netbook), etc., can also be D2D-enabled mobile phones, smart Watches, smart glasses, wireless modems (English: Modem).
  • the embodiment of the present invention provides a D2D STA, which is capable of receiving a D2D STA list and resource indication information broadcast by an AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is a mapping between the time-frequency resources allocated by the second D2D STA, the D2D STA being able to detect the second D2D STA on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship
  • the signal strength of the signal sent to the AP when the signal strength of the signal is greater than or equal to a preset threshold, the D2D STA determines that the second D2D STA is a D2D member of the D2D STA, wherein the first D2D STA and the second The D2D STA is within the coverage of the AP.
  • the D2D STA is configured to determine, according to the D2D STA list broadcasted by the AP, that the second D2D STA is a D2D STA, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is greater than or equal to a preset threshold.
  • the second D2D STA is determined to be a D2D member, and the AP is no longer required to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D discovery signal, thereby avoiding occupying excessive time-frequency resources. , thereby improving the throughput of the D2D system.
  • an embodiment of the present invention provides an AP, where the AP may include:
  • the broadcast unit 20 is configured to broadcast a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the allocation unit 21 is the Corresponding relationship between the time-frequency resources allocated by the two D2D STAs, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is the D2D of the first D2D STA The member, the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the AP further includes a receiving unit 22, a determining unit 23, and an adding unit 24,
  • the receiving unit 22 is configured to: before the broadcast unit 20 broadcasts the D2D STA list and the resource indication information, receive an association request frame sent by the STA, where the association request frame carries a D2D function identifier, where the D2D function identifier is used for Characterize whether the STA is a D2D STA.
  • the determining unit 23 is configured to determine, according to the D2D function identifier received by the receiving unit 22, whether the STA is a D2D STA.
  • the adding unit 24 is configured to add the identifier of the STA to the D2D STA list if the determining unit 23 determines that the STA is a D2D STA.
  • the D2D STA list broadcast by the broadcast unit 20 includes identifiers of multiple D2D STAs, where the multiple D2D STAs are all D2D STAs within the coverage of the AP, and the first D2D STAs and The second D2D STA is any two of the plurality of D2D STAs.
  • the broadcast unit 20 is specifically configured to carry the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the AP further includes a sending unit 25,
  • the receiving unit 22 is further configured to receive a request message sent by the first D2D STA, where the request message is used to request the sending unit 25 to send a downlink message to the second D2D STA, where the downlink message is used to indicate The second D2D STA sends a response message to the AP.
  • the sending unit 25 is configured to send the downlink message to the second D2D STA according to the request message received by the receiving unit 22.
  • the D2D STA list broadcast by the broadcast unit 20 further includes the number of the multiple D2D STAs.
  • the D2D STA list broadcast by the broadcast unit 20 further includes a quantity and a type identifier of the multiple D2D STAs, where the type identifier is used to indicate a type of the identifier of the multiple D2D STAs.
  • the embodiment of the present invention provides an AP, which is capable of broadcasting a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, the resource indication information includes the second D2D STA identifier, and the AP is the second D2D STA.
  • Distributed time frequency Corresponding relationship between resources, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, and the first D2D STA and the second D2D STA are in the AP Coverage.
  • the first D2D STA After the first D2D STA receives the D2D STA list broadcast by the AP, the first D2D STA can determine that the second D2D STA is a D2D STA, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is received, When the threshold is greater than or equal to the preset threshold, the first D2D STA may determine that the second D2D STA is a D2D member, and the AP does not need to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D. The signal is found to avoid consuming too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • an embodiment of the present invention provides a D2D STA, which may be the first D2D STA described in the foregoing embodiment.
  • the D2D STA may include a processor 30, a memory 31, a transceiver 32, and a system bus 33.
  • the processor 30, the memory 31, and the transceiver 32 are connected by the system bus 33 and complete communication with each other.
  • the processor 30 may be a central processing unit (English: central processing unit, abbreviated as CPU), or an application specific integrated circuit (ASIC), or configured to implement the implementation of the present invention.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the memory 31 may include a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); the memory 31 may also include a non-volatile memory (English: Non-volatile memory, such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English) : solid-state drive, abbreviated: SSD); the memory 31 may also include a combination of the above types of memories.
  • a volatile memory such as a random access memory (English: random-access memory, abbreviation: RAM)
  • the memory 31 may also include a non-volatile memory (English: Non-volatile memory, such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English)
  • the transceiver 32 can be a module with transceiver function integrated by a transmitter and a receiver, or a module with an independent transmitter and a separate receiver, the transceiver 32 for the D2D STA. Communicate with other devices, for example, The transceiver 32 is in communication with the AP under the control of the processor 30.
  • the processor 30, the memory 31, and the transceiver 32 may perform the method flow described in FIG. 1, FIG. 3 or FIG.
  • the transceiver 32 is configured to receive a D2D STA list and resource indication information that is broadcast by the access point AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier.
  • the processor 30 configured to: Detecting, according to the identifier of the second D2D STA and the corresponding relationship received by the transceiver 32, the second D2D STA on the time-frequency resource corresponding to the identifier of the second D2D STA The signal strength of the signal sent by the AP, when the signal strength of the signal is greater than or equal to a preset threshold, determining that the second D2D STA is a D2D member of the D2D STA.
  • the memory 31 is configured to store a code of the D2D STA list, a code of the resource indication information, a code of the second D2D STA identifier, a code of the correspondence, a code of a signal strength of the signal, a code of the preset threshold value, a code of the time-frequency resource, and a software program that controls the processor 30 to complete the above process, such that the processor 30 executes the software program and invokes the a code of the D2D STA list, a code of the resource indication information, a code of the second D2D STA identifier, a code of the correspondence, a code of a signal strength of the signal, a code of the preset threshold, And the code of the time-frequency resource completes the above process.
  • the processor 30 is configured to determine, according to the identifier of the second D2D STA and the corresponding relationship, the time-frequency resource corresponding to the identifier of the second D2D STA, where the second The D2D STA sends the signal to the AP on the time-frequency resource.
  • the processor 30 is specifically configured to detect a signal strength of the signal on the time-frequency resource.
  • the transceiver 32 is further configured to: after the processor 30 determines that the second D2D STA is a D2D member of the D2D STA, if the transceiver 32 Receiving, by the second D2D STA, a signal sent by the second D2D STA to the AP, in a preset time period, sending a request message to the AP, where the request message is used to request the AP to send to the second D2D STA. And a downlink message, where the downlink message is used to indicate that the second D2D STA sends a response message to the AP.
  • the processor 30 is further configured to detect a signal strength of the response message on the time-frequency resource, and determine the second when a signal strength of the response message is greater than or equal to the preset threshold.
  • the D2D STA is a D2D member of the D2D STA.
  • the D2D STA list received by the transceiver 32 further includes an identifier of the first D2D STA, where the transceiver 32 is further configured to receive the D2D STA list and resource indication information broadcast by the AP. And sending, by the AP, an association request frame, where the association request frame carries a D2D function identifier, where the D2D function identifier is used to represent that the first D2D STA is a D2D STA, and the D2D function identifier is used to indicate the AP Adding an identifier of the first D2D STA to the D2D STA list.
  • the embodiment of the present invention provides a D2D STA, which is capable of receiving a D2D STA list and resource indication information broadcast by an AP, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is a mapping between the time-frequency resources allocated by the second D2D STA, the D2D STA being able to detect the second D2D STA on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship
  • the signal strength of the signal sent to the AP when the signal strength of the signal is greater than or equal to a preset threshold, the D2D STA determines that the second D2D STA is a D2D member of the D2D STA, wherein the first D2D STA and the second The D2D STA is within the coverage of the AP.
  • the D2D STA is configured to determine, according to the D2D STA list broadcasted by the AP, that the second D2D STA is a D2D STA, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is greater than or equal to a preset threshold.
  • the second D2D STA is determined to be a D2D member, and the AP is no longer required to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D discovery signal, thereby avoiding occupying excessive time-frequency resources. , thereby improving the throughput of the D2D system.
  • an embodiment of the present invention provides an AP, where the AP may include: Processor 40, memory 41, transceiver 42, and system bus 43.
  • the processor 40, the memory 41, and the transceiver 42 are connected by the system bus 43 and complete communication with each other.
  • the processor 40 can be a CPU, or an ASIC, or one or more integrated circuits configured to implement embodiments of the present invention.
  • the memory 41 may include a volatile memory such as a RAM; the memory 41 may also include a non-volatile memory such as a ROM, a flash memory, an HDD or an SSD; the memory 41 may also include a memory of the above kind combination.
  • a volatile memory such as a RAM
  • the memory 41 may also include a non-volatile memory such as a ROM, a flash memory, an HDD or an SSD
  • the memory 41 may also include a memory of the above kind combination.
  • the communication interface 42 may be a module with a transceiver function integrated by a transmitter and a receiver, or a module having an independent transmitter and a separate receiver, and the transceiver 42 is used for the AP and the AP. Other devices communicate, for example, the transceiver 42 is in communication with the D2D STA under the control of the processor 40.
  • the processor 40 and the memory 41 may perform the method flow described in FIG. 2, FIG. 3 or FIG. 4, specifically including:
  • the transceiver 42 is configured to broadcast a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the processor 40 is Corresponding relationship between the time-frequency resources allocated by the second D2D STA, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is the first D2D A D2D member of the STA, the first D2D STA and the second D2D STA are within the coverage of the AP.
  • the transceiver 42 broadcasts the D2D STA list and the resource indication information under the control of the processor 40.
  • the memory 41 is configured to store a code of the D2D STA list, a code of the identifier of the second D2D STA, a code of the resource indication information, a code of the time-frequency resource, a code of the correspondence, and a control station.
  • the processor 40 completes the software program of the above process, so that the processor 40 executes the software program and invokes the code of the D2D STA list, the code of the identifier of the second D2D STA, the code of the resource indication information, The code of the time-frequency resource, and the code of the corresponding relationship, Into the above process.
  • the processor 40 is configured to determine, according to the D2D function identifier received by the transceiver 42, whether the STA is a D2D STA.
  • the processor 40 is further configured to add an identifier of the STA to the D2D STA list if the STA is a D2D STA.
  • the D2D STA list broadcast by the transceiver 42 includes identifiers of multiple D2D STAs, where the multiple D2D STAs are all D2D STAs within the coverage of the AP, and the first D2D STAs and The second D2D STA is any two of the plurality of D2D STAs.
  • the transceiver 42 is specifically configured to carry the D2D STA list in a predetermined management control broadcast frame for broadcast.
  • the transceiver 42 is further configured to receive a request message sent by the first D2D STA, where the request message is used to request the transceiver 42 to send a downlink message to the second D2D STA, where the downlink message is sent. And configured to instruct the second D2D STA to send a response message to the AP.
  • the transceiver 42 is further configured to send the downlink message to the second D2D STA according to the request message.
  • the D2D STA list broadcast by the transceiver 42 further includes the number of the multiple D2D STAs.
  • the D2D STA list broadcast by the transceiver 42 further includes a quantity and a type identifier of the multiple D2D STAs, where the type identifier is used to indicate a type of the identifier of the multiple D2D STAs.
  • the embodiment of the present invention provides an AP, which is capable of broadcasting a D2D STA list and resource indication information, where the D2D STA list includes an identifier of the second D2D STA, the resource indication information includes the second D2D STA identifier, and the AP is the second D2D STA.
  • Distributed time frequency Corresponding relationship between resources, the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, and the first D2D STA and the second D2D STA are in the AP Coverage.
  • the first D2D STA After the first D2D STA receives the D2D STA list broadcast by the AP, the first D2D STA can determine that the second D2D STA is a D2D STA, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is received, When the threshold is greater than or equal to the preset threshold, the first D2D STA may determine that the second D2D STA is a D2D member, and the AP does not need to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D. The signal is found to avoid consuming too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • a communication system may include at least one D2D STA as shown in FIG. 5 or FIG. 6, and any one of FIG. 7 to FIG. AP; the communication system may further include at least one D2D STA as shown in FIG. 10 and an AP as shown in FIG.
  • the D2D STA in the system provided by the embodiment of the present invention can receive the D2D STA list and the resource indication information of the AP broadcast, where the D2D STA list includes the identifier of the second D2D STA, and the resource indication information includes the second D2D STA identifier and the AP is the second.
  • Corresponding relationship between the time-frequency resources allocated by the D2D STA, the D2D STA being capable of detecting the second time on the time-frequency resource corresponding to the identifier of the second D2D STA according to the identifier of the second D2D STA and the corresponding relationship The signal strength of the signal sent by the D2D STA to the AP.
  • the D2D STA determines that the second D2D STA is a D2D member of the D2D STA, where the first D2D STA and The second D2D STA is within the coverage of the AP.
  • the AP in the system provided by the embodiment of the present invention can broadcast the D2D STA list and the resource indication information, where the D2D STA list includes the identifier of the second D2D STA, where the resource indication information includes the second D2D STA identifier and the AP is allocated to the second D2D STA.
  • the identifier of the second D2D STA and the corresponding relationship are used by the first D2D STA to determine whether the second D2D STA is a D2D member of the first D2D STA, where the first D2D STA and the second D2D STA are Within the coverage of the AP.
  • the D2D STA in the communication system can perform the discovery method between the devices in the D2D system as described in FIG. 1, FIG. 3 or FIG. 4, and the modules in the pair of D2D STAs.
  • the specific functions of the device and the flow of the method for performing the method reference may be made to the description in the embodiment shown in FIG. 1, FIG. 3 or FIG. 4, and details are not described herein again.
  • the AP in the communication system can perform the discovery method between the devices in the D2D system as described in FIG. 2, FIG. 3 or FIG. 4, and the specific functions and executions of the modules or devices in the AP.
  • the process of the method reference may be made to the description in the embodiment shown in FIG. 2, FIG. 3 or FIG. 4, and details are not described herein again.
  • the D2D STA can determine that the second D2D STA is a D2D STA according to the D2D STA list broadcast by the AP, and detect a signal sent by the second D2D STA to the AP, and when the signal strength of the signal is greater than Or, when the threshold is equal to the preset threshold, the second D2D STA is determined to be a D2D member, and the AP is no longer required to allocate a dedicated time-frequency resource for the second D2D STA, so that the second D2D STA sends the D2D discovery signal, thereby avoiding Occupy too much time-frequency resources, thereby increasing the throughput of the D2D system.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication through some interface, device or unit. Connections can be in electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (English full name: Read-Only Memory, English abbreviation: ROM), a random access memory (English full name: Random Access Memory, English abbreviation: RAM), magnetic A variety of media that can store program code, such as a disc or a disc.

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Abstract

本发明实施例提供一种D2D系统中设备之间的发现方法、装置及系统，涉及通信技术领域，能够避免占用过多的资源，从而提高D2D系统的吞吐量。该方法包括：第一D2D STA接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括对应关系，第一D2D STA根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当信号的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员。该方法应用于D2D通信技术中。

Description

D2D系统中设备之间的发现方法、装置及系统 技术领域
本发明涉及通信技术领域，尤其涉及D2D系统中设备之间的发现方法、装置及系统。
背景技术
设备到设备(英文：device-to-device，缩写：D2D)通信是指设备之间能够不通过核心网络直接进行通信的技术。D2D系统中的D2D设备在进行D2D通信之前，首先需要确定该系统中可以与该D2D设备进行D2D通信的其他D2D设备(可以称为该D2D设备的D2D成员)，即该系统中的D2D设备之间需进行发现过程。
在LTE网络中，D2D设备之间的发现过程的实现具体为：基站会为每个D2D设备分别分配一个专用资源，且每个D2D设备可以分别在基站为其分配的专用资源上发送自己的D2D发现信号。若某个D2D设备在某个专用资源上检测到D2D发现信号，则该D2D设备确定发送该D2D发现信号的D2D设备可以与其进行D2D通信，即发送该D2D发现信号的D2D设备为该D2D设备的D2D成员。
然而，当在WiFi系统中实现上述D2D设备之间的发现过程时，若接入点(英文：Access Point，缩写：AP)为其覆盖范围内的每个D2D站点(英文：station，缩写：STA)分别分配一个专用资源用于确定该D2D STA的D2D成员，则在AP资源有限的情况下，用于传输数据的资源将会减少，从而导致D2D系统的吞吐量降低。
发明内容
本发明提供D2D系统中设备之间的发现方法、装置及系统，能够避免占用过多的资源，从而提高D2D系统的吞吐量。
为达到上述目的，本发明采用如下技术方案：
第一方面，本发明提供一种D2D系统中设备之间的发现方法，包括：
第一D2D STA接收AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度；
当所述信号的信号强度大于或等于预设门限值时，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员。
在第一方面的第一种可能的实现方式中，所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度，包括：
所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
所述第一D2D STA在所述时频资源上检测所述信号的信号强度。
结合前述的第一方面或第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员之后，所述方法还包括：
若所述第一D2D STA在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则所述第一D2D STA向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述第一D2D STA在所述时频资源上检测所述应答消息的信号强度；
当所述应答消息的信号强度大于或等于所述预设门限值时，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员。
结合前述的第一方面或第一方面的第一种可能的实现方式至第一方面的第二种可能的实现方式中的任一种实现方式，在第三种可能的实现方式中，所述D2D STA列表中还包括所述第一D2D STA的标识，
所述第一D2D STA接收AP广播的D2D STA列表和资源指示信息之前，所述方法还包括：
所述第一D2D STA向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
第二方面，本发明提供一种D2D系统中设备之间的发现方法，包括：
AP广播D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
在第二方面的第一种可能的实现方式中，所述AP广播D2D STA列表和资源指示信息之前，所述方法还包括：
所述AP接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA；
所述AP根据所述D2D功能标识确定所述STA是否为D2D STA；
若所述AP确定所述STA为D2D STA，则所述AP将所述STA 的标识添加到所述D2D STA列表中。
结合前述的第二方面或第二方面的第一种可能的实现方式，在第二种可能的实现方式中，
所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
结合前述的第二方面或第二方面的第一种可能的实现方式至第二方面的第二种可能的实现方式中的任一种实现方式，在第三种可能的实现方式中，所述AP广播D2D STA列表，包括：
所述AP将所述D2D STA列表携带在预定的管理控制广播帧中广播。
结合前述的第二方面或第二方面的第一种可能的实现方式至第二方面的第三种可能的实现方式中的任一种实现方式，在第四种可能的实现方式中，所述方法还包括：
所述AP接收第一D2D STA发送的请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述AP根据所述请求消息，向所述第二D2D STA发送所述下行消息。
结合前述的第二方面或第二方面的第一种可能的实现方式至第二方面的第四种可能的实现方式中的任一种实现方式，在第五种可能的实现方式中，
所述D2D STA列表还包括所述多个D2D STA的数量；或者，
所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
第三方面，本发明提供一种D2D STA，包括：
接收单元，用于接收AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配 的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
检测单元，用于根据所述接收单元接收的所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度；
确定单元，用于当所述检测单元检测到所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
在第三方面的第一种可能的实现方式中，
所述检测单元，具体用于根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
所述检测单元，具体用于在所述时频资源上检测所述信号的信号强度。
结合前述的第三方面或第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述D2D STA还包括发送单元，
所述发送单元，用于在所述确定单元确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述接收单元在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述检测单元，还用于在所述时频资源上检测所述应答消息的信号强度；
所述确定单元，还用于当所述检测单元检测到所述应答消息的信号强度大于或等于所述预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
结合第三方面的第二种可能的实现方式，在第三种可能的实现方式中，所述接收单元接收的所述D2D STA列表中还包括所述第一 D2D STA的标识，
所述发送单元，还用于在所述接收单元接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
第四方面，本发明提供一种AP，包括：
广播单元，用于广播D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和分配单元为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
在第四方面的第一种可能的实现方式中，所述AP还包括接收单元、确定单元和添加单元，
所述接收单元，用于在所述广播单元广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA：
所述确定单元，用于根据所述接收单元接收的所述D2D功能标识确定所述STA是否为D2D STA；
所述添加单元，用于若确定单元确定所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
结合前述的第四方面或第四方面的第一种可能的实现方式，在第二种可能的实现方式中，
所述广播单元广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的 任意两个D2D STA。
结合前述的第四方面或第四方面的第一种可能的实现方式或第四方面的第二种可能的实现方式中的任一种实现方式，在第三种可能的实现方式中，
所述广播单元，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
结合第四方面的第一种可能的实现方式至第四方面的第三种可能的实现方式中的任一种实现方式，在第四种可能的实现方式中，，所述AP还包括发送单元，
所述接收单元，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述发送单元向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述发送单元，用于根据所述接收单元接收的所述请求消息，向所述第二D2D STA发送所述下行消息。
结合前述的第四方面或第四方面的第一种可能的实现方式至第四方面的第四种可能的实现方式中的任一种实现方式，在第五种可能的实现方式中，
所述广播单元广播的所述D2D STA列表还包括所述多个D2D STA的数量；或者，
所述广播单元广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
第五方面，本发明提供一种D2D STA，包括：
收发器，用于接收AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
处理器，用于根据所述收发器接收的所述第二D2D STA的标识和所述对应关系，检测所述第二D2D STA向所述AP发送的信号的信号强度，当所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员，所述信号的信号强度为所述收发器在所述时频资源上接收到的所述信号的信号强度。
在第五方面的第一种可能的实现方式中，
所述处理器，具体用于根据所述第二D2D STA的标识和所述对应关系，确定所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
所述处理器，具体用于检测所述收发器在所述时频资源上接收到的所述信号的信号强度。
结合前述的第五方面或第五方面的第一种可能的实现方式，在第二种可能的实现方式中，
所述收发器，还用于在所述处理器确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述收发器在预设时间段内未接收到所述信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述处理器，还用于检测所述收发器在所述时频资源上接收到的所述应答消息的信号强度，当所述应答消息的信号强度小于所述预设门限值时，确定所述第二D2D STA不为所述D2D STA的D2D成员。
结合前述的第五方面或第五方面的第一种可能的实现方式至第五方面的第二种可能的实现方式中的任一种实现方式，在第三种可能的实现方式中，
所述收发器，还用于在接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为 D2D STA。
第六方面，本发明提供一种AP，包括：
收发器，用于广播D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和处理器为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
在第六方面的第一种可能的实现方式中，
所述收发器，还用于在广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA；
所述处理器，用于根据所述收发器接收的所述D2D功能标识确定所述STA是否为D2D STA；
所述处理器，还用于若所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
结合前述的第六方面或第六方面的第一种可能的实现方式，在第二种可能的实现方式中，
所述收发器广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
结合前述的第六方面或第六方面的第一种可能的实现方式至第六方面的第二种可能的实现方式中的任一种实现方式，在第三种可能的实现方式中，
所述收发器，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
结合前述的第六方面或第六方面的第一种可能的实现方式至第 六方面的第三种可能的实现方式中的任一种实现方式，在第四种可能的实现方式中，
所述收发器，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述收发器向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
所述收发器，还用于根据所述请求消息，向所述第二D2D STA发送所述下行消息。
结合前述的第六方面或第六方面的第一种可能的实现方式至第六方面的第四种可能的实现方式中的任一种实现方式，在第五种可能的实现方式中，
所述收发器广播的所述D2D STA列表还包括所述多个D2D STA的数量；或者，
所述收发器广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
第七方面，本发明提供一种通信系统，包括：
如上述第三方面或第三方面的任一种可能的实现方式所述的D2D STA，和上述第四方面或第四方面的任一种可能的实现方式所述的AP；或者，
上述第五方面或第五方面的任一种可能的实现方式所述的D2D STA，和上述第六方面或第六方面的任一种可能的实现方式所述的AP。
本发明提供一种D2D系统中设备之间的发现方法、装置及系统，可以包括第一D2D STA接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第一D2D STA根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预 设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员，其中，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过本发明提供一种D2D系统中设备之间的发现方法、装置及系统，第一D2D STA能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种D2D系统中设备之间的发现方法的流程图；
图2为本发明实施例提供的一种D2D系统中设备之间的发现方法的流程图；
图3为本发明实施例提供的一种D2D系统中设备之间的发现方法的交互图；
图4为本发明实施例提供的一种改变广播D2D STA列表的周期的算法流程图；
图5为本发明实施例提供的一种D2D STA的结构示意图；
图6为本发明实施例提供的一种D2D STA的结构示意图；
图7为本发明实施例提供的一种AP的结构示意图；
图8为本发明实施例提供的一种AP的结构示意图；
图9为本发明实施例提供的一种AP的结构示意图；
图10本发明实施例提供的一种D2D STA的硬件结构示意图；
图11本发明实施例提供的一种AP的硬件结构示意图；
图12本发明实施例提供的一种通信系统框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
首先，对本发明提供的D2D系统中设备之间的发现方法、装置及系统适用的WiFi系统进行简要地介绍。
在本发明提供的D2D系统中设备之间的发现方法、装置及系统适用的WiFi系统中，AP具有D2D功能，且AP还具有调度功能，即AP能够对当前申请上行时频资源的STA进行统一调度，并将对申请上行时频资源的STA资源分配情况在资源指示信息(英文：resource allocation)中进行集中指示，以及广播资源指示信息。从而，该AP覆盖范围内的每个STA都能够根据该资源指示信息获知其他STA的资源分配情况。
进一步的，为了方便描述，在本发明实施例中，D2D STA是指具有D2D功能的STA，普通STA是指不具有D2D功能的STA。
实施例一
本发明实施例提供一种D2D系统中设备之间的发现方法，如图1所示，该方法可以包括：
S101、第一D2D STA接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第一D2D STA和第二D2D STA在AP的覆盖范围内。
需要说明的是，第一D2D STA接收到的AP广播的D2D STA列表中，包括该AP覆盖范围内所有D2D STA的标识，即由该AP提供服务的所有D2D STA的标识。第一D2D STA和第二D2D STA 为该AP覆盖范围内所有D2D STA中的任意两个。
在本发明实施例中，D2D STA列表用于通知该AP覆盖范围内的每个D2D STA，该AP覆盖范围内的所有D2D STA的标识，即通知每个D2D STA，该AP覆盖范围内哪些STA为D2D STA，从而每个D2D STA可以确定能够从哪些STA中确定其D2D成员。
需要说明的是，第一D2D STA接收到的AP广播该资源指示信息中至少包括第二D2D STA的标识和AP为第二D2D STA分配的时频资源之间的对应关系。该资源指示信息中还可能包括该AP覆盖范围内的其他D2D STA的标识和AP为其他D2D STA分配的时频资源之间的对应关系，该资源指示信息中还可能包括该AP覆盖范围内的普通STA的标识和AP为普通STA分配的时频资源之间的对应关系。
S102、第一D2D STA根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度。
当第一D2D STA接收到D2D STA列表后，根据该D2D STA列表，可以确定第二D2D STA为一个D2D STA，从而第一D2D STA可以进一步对第二D2D STA向AP发送的信号进行检测，以判断第二D2D STA是否为其D2D成员。
具体的，上述S102可以包括：
S1、第一D2D STA根据第二D2D STA的标识和该对应关系，确定与第二D2D STA的标识对应的时频资源。
其中，该时频资源即为上述AP为第二D2D STA分配的时频资源，第二D2D STA在该时频资源上向AP发送信号。
具体的，当第一D2D STA接收到AP广播的资源指示信息后，由于该资源指示信息中包括第二D2D STA的标识和该时频资源之间的对应关系，从而第一D2D STA可以根据第二D2D STA的标识和该对应关系，确定该时频资源。
S2、第一D2D STA在该时频资源上检测该信号的信号强度。
其中，第一D2D STA能够在该该时频资源上接收到的该信号，因此，第一D2D STA在该时频资源上检测该信号的信号强度，可以理解为第一D2D STA检测第一D2D STA在该时频资源上其接收到的该信号的信号强度，具体可以为第一D2D STA检测第一D2D STA在该时频资源上接收到的信号的接收功率。
需要说明的是，由于第二D2D STA在该时频资源上向AP发送信号，因此，当第一D2D STA根据第二D2D STA的标识和该对应关系确定该时频资源后，第一D2D STA即可确定在该时频资源上接收到的信号即为第二D2D STA向AP发送的信号。
可以理解的是，第一D2D STA在该时频资源上检测的信号的信号强度，即为第一D2D STA检测第二D2D STA向AP发送的信号的信号强度。
S103、当该信号的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员。
其中，预设门限值可以设置为D2D通信功率控制条件下对应的最低调制编码模式(英文：modulation and coding scheme，缩写：MCS)的最低接收灵敏度，即能够保证设备之间进行D2D通信时不干扰主链路通信的最低接收灵敏度。预设门限值也可以根据实际工程的需要进行设置，例如，可以根据D2D STA之间的通信质量的要求进行设置。
需要说明的是，在本发明实施例中，AP覆盖范围内的每个D2D STA都可以作为第一D2D STA并执行上述S101-S103中所述的方法，且AP覆盖范围内的所有D2D STA中除上述第一D2D STA外的其他D2D STA，均为相对于该第一D2D STA的第二D2D STA，第一D2D STA可以检测每个第二D2D STA向AP发送的信号的信号强度，从而从其他D2D STA中确定其D2D成员。
本发明实施例提供一种D2D系统中设备之间的发现方法，该方法可以为第一D2D STA接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括 第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第一D2D STA根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员，其中，AP为第一D2D STA和第二D2D STA提供服务。通过该方法，第一D2D STA能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
本发明实施例提供一种D2D系统中设备之间的发现方法，如图2所示，该方法可以包括：
S201、AP广播D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第二D2D STA的标识和该对应关系用于第一D2D STA确定第二D2D STA是否为第一D2D STA的D2D成员，第一D2D STA和第二D2D STA在AP的覆盖范围内。
需要说明的是，AP广播的D2D STA可以不止包括一个第二D2D STA的标识，AP广播的D2D STA列表可以包括多个D2D STA的标识。该多个D2D STA为所述AP的覆盖范围内的所有D2D STA，即该多个D2D STA为由该AP提供服务的所有D2D STA。其中，第一D2D STA和第二D2D STA为该多个D2D STA中的任意两个D2D STA。
进一步的，第一D2D STA即指如图1所示实施例中的第一D2D STA，第二D2D STA即指如图1所示实施例中的第二D2D STA，可以参见如图1所示的实施例中对第一D2D STA和第二D2D的相关 描述，此处不再赘述。
在本发明实施例中，D2D STA的标识可以为该D2D STA的ID。从而D2D STA列表可以包括该AP覆盖范围内的所有的D2D STA的ID，示例性的，假设，该AP覆盖范围内共有20个D2D STA，该20个D2D STA的ID分别为D2D STA1、D2D STA2、......、D2D STA19、D2D STA20，则D2D STA列表可以如表1所示。
表1
D2D STA1 D2D STA2 ...... D2D STA19 D2D STA20
可选的，D2D STA列表中还可以包括该AP覆盖范围内的D2D STA的数量，示例性的，D2D STA列表可以如表2所示。
表2
20 D2D STA1 D2D STA2 ...... D2D STA19 D2D STA20
可选的，D2D STA列表中还可以包括该AP覆盖范围内的D2D STA的数量，类型标识，以及D2D STA的标识，其中，类型标识用于指示D2D STA的标识的类型。
示例性的，在本发明实施例中，类型标识可以由两个比特位表示，具体的，当该两个比特位的赋值不同时，该D2D STA列表中D2D STA的标识也以不同的方式表征。
(1)当类型标识赋值为00时，为以位图的方式表征D2D STA的标识。具体的，假设该AP可同时接入L个STA，即该AP可以同时为L个STA提供服务，则用于记录D2D STA的标识的字段的长度为L，即该字段共L个比特位。该长为L的字段为一个位图。AP为其覆盖范围内所有的STA分配该位图中的一个比特位。当某个比特位置0时，表示与该比特位对应的STA为普通STA，当该比特位置1时，表示与该比特位对应的STA为D2D STA。
示例性的，假设第1个比特位对应STA 1，第2个比特位对应STA2，第3个比特位对应STA3，第4个比特位对应STA4，第5个比特位对应STA5，第6个比特位对应STA6，......。当将该字段的赋值为000110......时，表征STA1、STA2、STA3、STA6为普通STA， STA4和STA5为D2D STA等。
需要说明的是，当该AP覆盖范围内的D2D STA的数量较大时，可以采用位图的方式表征D2D STA的标识，例如，当该AP覆盖范围内的D2D STA的数量大于128时，可采用位图的方式指示D2D STA的标识。进一步的，判断该AP覆盖范围内的D2D STA的数量是否较大的阈值，可以根据实际工程的需要进行设计，此处不作限制。
(2)当类型标识赋值为01时，D2D STA即为D2D STA的ID，且D2D STA的ID以偏移量的方式记录。具体的，用于记录D2D STA的标识的字段的长度可以小于L。假设一个STA的ID需要占用n个比特位，可以将前n个比特位赋值为第一个D2D STA的ID，前n个比特位后面每m个比特位为一个偏移字段。当偏移字段中的赋值不为0时，表示该STA为一个D2D STA，且该D2D STA的ID为前一个STA的ID加上该偏移字段中的赋值，当偏移字段为0时，表示该STA为一个普通STA，且该普通STA的ID为前一个STA的ID加上2的m次方再减1。
示例性的，以n＝8，m＝4为例，当用于记录D2D STA的标识的字段的赋值为00001011 0000 0100......时，前8个比特位的赋值00001011表示第一个D2D STA的ID为11。由于第一个偏移字段为0000，因此第二个STA为普通STA，且由于第一个D2D STA的ID为11，因此，该普通STA的ID为11+2m-1＝26。进一步的，由于第二个偏移字段为0100，因此第三个STA为D2D STA，且由于第二个STA的ID为26，因此，该D2D STA的ID为26+4＝30。
需要说明的是，当D2D STA的数量小于L/m，且STA ID间隔较小时可以采用偏移量的方式记录D2D STA的ID。
(3)当类型标识赋值为10时，D2D STA的标识即为D2D STA的ID，每n个比特位表征一个D2D STA的ID。
示例性的，以n＝8为例，当用于记录D2D STA的标识的字段的赋值为0000101100100000......时，前8个比特位00001011为D2D  STA11的ID，第二个8个比特位00100000为D2D STA32的ID。
需要说明的是，当类型标识赋值为01时，该用于记录D2D STA的标识的字段的实际长度为D2D STA的数量与n的乘积，且该实际长度小于L。具体的，当D2D STA的数量小于L/n，且D2D STA的ID间隔较大时使用。
(4)当类型标识赋值为11时，可以通过其他方式指示D2D STA的标识。
示例性的，D2D STA列表可以如表3所示，其中，D2D STA的数量为5，类型标识为01，该5个D2D STA的ID依次为11(即000010110)、32(即0100000)、3(即00000011)、48(即00110000)、33(即00100001)。
表1
5 10 000010110 0100000 00000011 00110000 00100001
本分发明实施例提供一种D2D系统中设备之间的发现方法，该方法可以为AP广播D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第二D2D STA的标识和该对应关系用于第一D2D STA确定第二D2D STA是否为第一D2D STA的D2D成员，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过该方法，当该第一D2D STA接收到AP广播的D2D STA列表后，能够确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
实施例二
本发明实施例提供一种D2D系统中设备之间的发现方法，如图3所示，该方法可以包括：
S301、第一D2D STA向AP发送关联请求(英文：association request)帧。
需要说明的是，在本发明实施例中，当STA向AP发送关联请求帧，以请求接入该AP时，STA可以在该关联请求帧中携带一个D2D功能标识，该D2D功能标识用于表征STA是否为D2D STA。
示例性的，可以在该关联请求帧中的扩展能力(英文：extended capabilities)字段增加一个比特位的D2D功能标识，当该比特位的赋值为1时，表征该STA为D2D STA，当该比特位为的赋值0时，表征该STA为普通STA。
因此，第一D2D STA向AP发送的关联请求帧中携带的D2D功能标识表征第一D2D STA位一个D2D STA。
S302、AP接收到该关联请求帧后，根据该关联请求中携带的D2D功能标识，确定第一D2D STA为D2D STA。
S303、AP将第一D2D STA的标识添加到D2D STA列表中。
S304、AP广播D2D STA列表。
具体的，AP可以将D2D STA列表携带在预定的管理控制广播帧中广播。
需要说明的是，在WiFi系统中，管理控制广播帧具有固定的广播周期。因此，在本发明实施例中，预定的管理控制广播帧，即指在预定的广播周期广播的管理控制广播帧。
可选的，AP可以在每个广播周期广播的管理控制广播帧中都携带D2D STA列表。即可以理解的是，AP广播D2D STA列表的周期和AP广播管理控制广播帧的广播周期相同。
可选的，AP可以在每隔M个广播周期广播的管理控制广播帧中携带D2D STA列表。
示例性的，假设M为3，则若AP在第1个广播周期广播的管理控制广播帧中携带了D2D STA列表，则AP在2、3、4个广播周期广播的管理控制广播帧中不携带D2D STA列表，AP在第5个广播周期广播的管理控制广播帧中携带D2D STA列表。即AP广播D2D  STA列表的周期为上述广播周期的M+1倍。
可选的，在本发明实施例中，也可以为根据预设算法而实时确定携带D2D STA列表的管理控制广播帧，即根据预设算法实时改变广播D2D STA列表的周期。
下面一种可能的改变广播D2D STA列表的周期的算法为例，进行示例性的说明。
需要说明的是，在下述示例中，上述管理控制广播帧的固定的广播周期可以表示为T，广播D2D STA列表的周期可以表示为Td，上一次有新的D2D STA请求接入AP的时间可以表示为Tpre，上一次周期变更的时间可以表示为Tchang。
进一步的，如图4所示，该算法可以包括：
S20、开始。
S21、设置N＝0，Tpre＝0，Tchang＝0，周期变更阀门可以表示为Tag，N＝0，广播D2D STA列表的最大周期可以表示为Tdmax。
S22、AP判断是否有新的D2D STA请求接入，若是，则执行S23，若否，则返回执行S22。
S23、Tpre＝当前时间，N＝1，Td＝T*N。
即，若有新的D2D STA请求接入AP，则AP以广播管理控制广播帧的广播周期广播D2D STA列表，即表示AP在每个广播周期广播的管理控制广播帧中都携带D2D STA列表。
S24、AP判断是否有新的D2D STA请求接入，并判断当前时间与Tpre的差是否大于或等于Tag，若AP确定有新的D2D STA请求接入，则返回S23重新执行；若AP确定没有新的D2D STA请求接入，且当前时间与Tpre的差小于Tag，则返回S24重新执行；若AP确定没有新的D2D STA请求接入，且当前时间与Tpre的差大于或等于Tag，则执行S25。
S25、N＝N+1，Td＝T*N，Tchang＝当前时间。
即，表示AP在每隔N-1个广播周期广播的管理控制广播帧中携带D2D STA列表，即AP每广播N个管理控制广播帧，只在一个 管理控制广播帧中携带D2D STA列表。
S26、AP判断是否有新的D2D STA请求接入，并判断当前时间与Tpre的差是否大于或等于Tag，以及判断N是否等于A，若AP确定有新的D2D STA请求接入，则返回S23重新执行；若AP确定没有新的D2D STA请求接入，且当前时间与Tpre的差大于或等于Tag，以及Td＜Tdmax，则执行S25；若AP确定没有新的D2D STA请求接入，且当前时间与Tpre的差小于Tag，以及Td＜Tdmax，则返回S26重新执行；若AP确定Td≥Tdmax，则执行S27。
S27、Td＝Tdmax。
即当Td≥Tdmax后，则以Tdmax为周期广播D2D STA列表。
S28、AP判断是否有，若是，则执行S23，若否，则执行S28。
在本发明实施例中，当Td＝Tdmax后，若没有新的D2D STA请求接入，则AP保持以Tdmax为周期广播D2D STA列表。
进一步的，通过上述算法，一方面，可以在有新的D2D STA请求接入该AP时，在每个广播周期广播的管理控制广播帧中都携带D2D STA列表，从而及时通知该AP覆盖范围内原本的D2D STA有新的D2D STA接入AP，以使原本的D2D STA能够及时判断该新的D2D STA是否为其D2D成员。同时，也及时通知该，该AP覆盖范围内原本有哪些D2D STA，以使该新的D2D STA能够及时从原本的D2D STA中确定自己的D2D成员。
另一方面，可以在没有新的D2D STA请求接入的情况下，逐渐递增广播D2D STA列表的周期，直至递增至最大周期，并以该最大周期广播D2D STA列表，从而节省广播D2D STA列表时消耗的资源。
示例性的的，假设上述管理控制广播帧为WiFi系统中的信标(英文：beacon)帧，Beacon_Interval为WiFi系统中由AP设定的广播Beacon的固定的周期值，假设Tdmax＝10*Beacon_Interval，Tag＝5*Beacon_Interval，实际D2D列表广播周期Td属于[Beacon_Interval，Tmax]。
当有新的D2D STA请求接入该AP时，AP以Td＝Beacon_Interval来广播D2D STA列表，并及时记录最新的D2D STA接入AP的时间Tpre。若在[Tpre，Tpre+Tag]内没有新的D2D STA请求接入该AP，则记录Tchange＝当前时刻，N＝2，此时AP以Td＝2*Beacon_Interval来广播D2D STA列表。
示例性的，当AP以Td＝2*Beacon_Interval广播D2D STA列表时，若AP在当前时刻广播的Beacon帧中携带了D2D列表信息，则AP在下一个广播周期广播的Beacon帧中不携带D2D列表信息，AP在下下一个广播周期广播的Beacon帧中携带D2D列表信息。即AP在每相隔1个Beacon_Interval广播的Beacon帧中携带D2D列表信息。
进一步的，当Td递增至Tdmax＝10*Beacon_Interval时，则Td不再递增，并保持以10*Beacon_Interval为周期广播D2D STA列表，可以理解的时，广播的10个Beacon帧中，只有一个beacon帧中携带了D2D列表信息。
S305、AP广播资源指示信息，该资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系。
S306、第一D2D STA接收到D2D STA列表和该资源指示信息后，确定AP为第二D2D STA分配的时频资源。
S307、第二D2D STA接收到该资源指示信息后，在该时频资源上向AP发送信号。
S308、第一D2D STA在该时频资源上接收第二D2D STA向AP发送的信号。
需要说明的是，上述S307可以在上述S306之前执行，也可以和上述S308同时执行，即第二D2D STA在向AP发送信号的同时，该信号也被第一D2D STA接收到。
S309、第一D2D STA在该时频资源检测信号的信号强度。
S310、当该信号的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员。
在本发明实施例中，第一D2D STA维护了一个D2D成员集合，该D2D成员集合包括第一D2D STA上一次确定的第一D2D STA的D2D成员的标识。
当第一D2D STA检测到该信号的信号强度大于或等于预设门限值后，若第一D2D STA确定第二D2D STA的标识已经属于该D2D成员集合，则第一D2D STA不做相关处理。若第一D2D STA确定第二D2D STA的标识不属于该D2D成员集合，则第一D2D STA将第二D2D STA的标识添加到该D2D成员集合中。
S311、当该信号的信号强度小于预设门限值时，第一D2D STA确定第二D2D STA不为第一D2D STA的D2D成员。
当第一D2D STA检测到该信号的信号强度小于预设门限值后，若第一D2D STA确定第二D2D STA的标识属于该D2D成员集合，则第一D2D STA将第二D2D STA的标识从该D2D成员集合中期除。若第一D2D STA确定第二D2D STA的标识不属于该D2D成员集合，则第一D2D STA不做相关处理。
需要说明的是，上述S310和S311择一执行。
进一步的，在本发明实施例中，第一D2D STA和第一D2D STA的D2D成员都可能处于移动状态，当第一D2D STA和第一D2D STA的某个D2D成员之间的距离过远时，第一D2D STA能够接收到的该D2D成员发送的信号的信号强度，有可能不能满足第一D2D STA和其D2D成员之间进行通信的要求。甚至第一D2D STA可能接收不到该D2D成员发送的信号。
该D2D成员也有可能处于休眠状态，即第一D2D STA的D2D成员不向AP发送信号，从而到导致第一D2D STA无法检测该D2D成员发送的信号的信号强度，此时，第一D2D STA不能确定该D2D成员是由于移动的关系，导致第一D2D STA与该D2D成员之间的距离过远，进而该D2D成员不再适合作为第一D2D STA的D2D成员，还是由于该D2D成员只是处于休眠状态，但任然处于第一D2D STA的附近。
对此，本发明实施例提供一种方法，以避免上述情况。示例性的，以第一D2D STA和第二D2D STA为例，该第二D2D STA为第一D2D STA的D2D成员。
S30、若第一D2D STA在预设时间段内未接收到第二D2D STA向AP发送的信号，则第一D2D STA向AP发送请求消息，该请求消息用于请求AP向第二D2D STA发送下行消息。
S31、AP接收到该请求消息后，根据该请求消息，向第二D2D STA发送所述下行消息，该下行消息用于指示第二D2D STA向AP发送应答消息。
需要说明的是，根据WiFi系统的通信机制，AP在向第二D2D STA发送下行消息之前，还广播了资源指示信息，该资源指示信息中包括第二D2D STA的标识和AP为第二D2D STA分配的时频资源之间的对应关系。该时频资源用于第二D2D STA向AP发送应答消息。
S32、第二接收到该请求消息后，在该时频资源上向AP发送应答消息。
S33、第一D2D STA在该时频资源上检测应答消息的信号强度。
S34、当应答消息的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员。
具体的，当应答消息的信号强度小于预设门限值时，第一D2D STA确定与该第二D2D STA之间已经不适合进行D2D通信，则第一将第二D2D STA的标识从第一D2D STA维护的其D2D成员集合中删除。
当应答消息的信号强度大于或等于预设门限值，则说明在预设时间段内，第二D2D STA处于休眠状态。第二D2D STA仍为第一D2D STA的D2D成员。
进一步的，需要说明的是，上述实施例中均以第一D2D STA如何确定一个第二D2D STA是否为其D2D成员，对本发明实施例提供的D2D系统中设备之间的发现方法进行说明的。可以理解的，当 第一D2D STA接收到D2D STA列表后，第一D2D STA需对D2D STA列表中的每一个第二D2D STA进行判断。
具体的，当第一D2D STA接收D2D STA列表后，第一D2D STA可以确定该AP覆盖范围内的第二D2D STA集合，即AP覆盖范围内除第一D2D STA外的其他所有的D2D STA的集合。进而，第一D2D STA开始周期性地该第二D2D STA集合进行检测，以从该第二D2D STA集合中确定第一D2D STA的D2D成员集合。
示例性的，在本发明实施例中，第一D2D STA周期性地该第二D2D STA集合进行检测的方式，有如下两种(方式一和方式二)。
方式一、预设一个固定的检测周期，该固定的检测周期可以表示为T_dis，第一D2D STA接收到AP广播的D2D STA列表后，第一D2D STA即可开始以T_dis为周期，对该第二D2D STA集合进行检测。
具体的，在一个T_dis内，当第一D2D STA接收到第一个资源指示信息时，第一D2D STA开启D2D发现定时器，并开始根据该资源指示信息中包括的第二D2D STA的标识和AP为第二D2D STA分配的时频资源之间的对应关系(以下简称第二D2D STA的对应关系)，检测第一D2D STA在该时频资源上接收到的信号的信号强度，以判断该第二D2D STA是否为第一D2D STA的D2D成员。
需要说明的是，上述第一个资源指示信息中可能只包括该第二D2D STA集合中的某一个或某几个第二D2D STA的对应关系。且在D2D发现定时器的计时时间段内，第一D2D STA可能接收到多个资源指示信息，第一D2D STA需根据在该计时时间段内接收到的资源指示信息中包括的部分第二D2D STA的对应关系，对该部分第二D2D STA发送的信号的信号强度均进行检测。
其中，该D2D发现定时器可以是正计时器，也可以是倒计时器。
当D2D发现定时器超时时，第一D2D STA可以停止在该周期内的检测，否则，第一D2D STA在该计时时间段内继续进行检测。
方式二、可以预设一个较小的检测周期和一个较大的检测周期， 该较小的检测周期可以表示为T_dis_min，该较大的检测周期可以表示为T_dis_max。
假设，第一D2D STA接收到D2D STA列表后，开始检测之前，第一D2D STA维护的D2D成员集合为第一集合，可以理解的是，第一集合属于第一D2D STA根据接收到的D2D STA列表确定的第二D2D STA集合。
由于移动的原因，导致原本属于第一集合中的某些第二D2D STA与第一D2D STA的距离较远，使得这些第二D2D STA不再适合与第一D2D STA之间进行D2D通信，因此，在本发明实施例中，第一D2D STA可以以T_dis_min为周期，对于第一集合中的第二D2D STA进行检测，以及时检测到这些第二D2D STA，并将这些第二D2D STA的标识从第一集合中删除。
同样，由于移动的原因，导致原本不属于第一集合中的某些第二D2D STA与第一D2D STA的距离较近，使得这些第二D2D STA能够与第一D2D STA之间进行D2D通信，因此，在本发明实施例中，第一D2D STA可以以T_dis_max为周期，对于属于第二D2D STA集合但是不属于第一集合的第二D2D STA进行检测。
另外，第一D2D STA根据当前接收到的D2D STA列表确定的第二D2D STA集合中，可能还有新增的第二D2D STA，由于第一D2D STA不能确定该新增的第二D2D STA是否适合与其进行D2D通信，因此，在本发明实施例中，第一D2D STA也可以以T_dis_min为周期，对该新增的第二D2D STA进行检测，以检测该新增的第二D2D STA是否能够作为第一D2D STA的D2D成员。
进一步的，为了更好的说明本发明实施例中提到的，第一D2D STA根据接收到的D2D STA列表和资源指示信息，确定第二D2D STA是否为其D2D成员，下面结合一个示例，进行详细的说明。
假设，第一D2D STA根据其接收到的D2D STA列表确定的多个第二D2D STA的标识分别为STA1、STA3、STA5等。第一D2D STA接收到的某个资源指示信息中包括三个STA的对应关系。其中，该 三个STA的标识分别为STA1、STA2以及STA3。AP为STA1分配的时频资源为标号1-15的RB，AP为STA2分配的时频资源为标号16-23的RB，AP为STA3分配的时频资源为标号24-31的RB。
根据D2D STA列表可知，该资源指示信息中的STA1、STA3为第二D2D STA，从而第一D2D STA可以对STA1和STA3分别向AP发送的信号进行检测。
具体的，第一D2D STA根据STA1确定AP为STA1分配的时频资源，然后第一D2D STA在该时频资源上检测信号。具体的，第一D2D可以检测标号为1-15的RB中的任一个RB上的信号的信号强度，也可以检测标号为1-15的RB中的多个或全部RB上的信号的信号强度的平均值，本发明实施例不作限制
当该信号的信号强度大于或等于预设门限值时，第一D2D STA确定STA 1为其D2D成员。进一步的，若第一D2D STA确定STA1已经属于第一D2D STA的D2D成员集合，则第一D2D STA不做相关操作。若第一D2D STA确定STA1不属于第一D2D STA的D2D成员集合，则第一D2D STA将STA1添加到其D2D成员集合中。
当该信号的信号强度小于预设门限值时，第一D2D STA确定STA1不是其D2D成员。进一步的，若第一D2D STA确定STA1已经属于第一D2D STA的D2D成员集合，则第一D2D STA将STA1从其D2D成员集合中删除。若第一D2D STA确定STA1不属于第一D2D STA的D2D成员集合，则第一D2D STA不做相关操作。
进一步的，当第一D2D STA对第二D2D STA集合的检测结束后，若第一D2D STA确定第一D2D STA更新了其维护的D2D成员集合，即第一D2D STA确定对D2D成员结合进行了添加和/或删除操作，则第一D2D STA可以将更新后的D2D成员集合发送至AP，以使得AP能够为第一D2D STA和D2D成员之间D2D通信分配合理的时频资源。
本分发明实施例提供一种D2D系统中设备之间的发现方法，该方法可以第一D2D STA接收AP广播的D2D STA列表和资源指示信 息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第一D2D STA根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预设门限值时，第一D2D STA确定第二D2D STA为第一D2D STA的D2D成员，其中，AP为第一D2D STA和第二D2D STA提供服务。通过该方法，第一D2D STA能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
实施例三
如图5所示，本发明实施例提供一种D2D STA，可以包括：
接收单元10，用于接收AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
检测单元11，用于根据所述接收单元10接收的所述第二D2D STA的标识和所述对应关系，在与第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度。
确定单元12，用于当所述检测单元11检测到所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
可选的，所述检测单元11，具体用于根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所 述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
所述检测单元11，具体用于在所述时频资源上检测所述信号的信号强度。
可选的，结合图5，如图6所示，所述D2D STA还包括发送单元13。
所述发送单元13，用于在所述确定单元12确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述接收单元10在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息。
所述检测单元11，还用于在所述时频资源上检测所述应答消息的信号强度。
所述确定单元12，还用于当所述检测单元11检测到所述应答消息的信号强度大于或等于所述预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
可选的，所述接收单元10接收的所述D2D STA列表中还包括所述第一D2D STA的标识，所述发送单元13，还用于在所述接收单元10接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
需要说明的是，本发明实施例提供的D2D STA即指如图1、如图3以及如图4所示实施例中的第一D2D STA，能够执行如图1、如图3以及如图4所示的方法流程。
在本发明实施例中，D2D STA可以为具有D2D功能的通信设备，例如，D2D STA可以为具有D2D功能的移动台(英文：Mobile  Station)、个人电脑(英文：Personal Computer)、膝上型电脑(英文：Laptop Computer)、平板电脑(英文：Tablet Computer)、上网本(英文：Netbook)等，还可以是具有D2D功能的手机、智能手表、智能眼镜、无线调制解调器(英文：Modem)等。
本发明实施例提供一种D2D STA，该D2D STA能够接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，该D2D STA能够根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预设门限值时，该D2D STA确定第二D2D STA为该D2D STA的D2D成员，其中，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过该D2D STA，能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
如图7所示，本发明实施例提供一种AP，该AP可以包括：
广播单元20，用于广播D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和分配单元21为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
可选的，结合图7，如图8所示，所述AP还包括接收单元22、确定单元23和添加单元24，
所述接收单元22，用于在所述广播单元20广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA。
所述确定单元23，用于根据所述接收单元22接收的所述D2D功能标识确定所述STA是否为D2D STA。
所述添加单元24，用于若确定单元23确定所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
可选的，所述广播单元20广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
可选的，所述广播单元20，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
可选的，结合图8，如图9所示，所述AP还包括发送单元25，
所述接收单元22，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述发送单元25向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息。
所述发送单元25，用于根据所述接收单元22接收的所述请求消息，向所述第二D2D STA发送所述下行消息。
可选的，所述广播单元20广播的所述D2D STA列表还包括所述多个D2D STA的数量。
或者，所述广播单元20广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
本分发明实施例提供一种AP，该AP能够广播D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频 资源之间的对应关系，第二D2D STA的标识和该对应关系用于第一D2D STA确定第二D2D STA是否为第一D2D STA的D2D成员，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过该AP，使得该第一D2D STA接收到AP广播的D2D STA列表后，能够确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
实施例四
如图10所示，本发明实施例提供一种D2D STA，该D2D STA可以是上述实施例中所述的第一D2D STA。该D2D STA可以包括：处理器30、存储器31、收发器32、以及系统总线33。所述处理器30、所述存储器31以及收发器32之间通过所述系统总线33连接并完成相互间的通信。
所述处理器30可以是一个中央处理器(英文：central processing unit，缩写：CPU)，或者是特定集成电路(英文：application specific integrated circuit，缩写：ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路。
所述存储器31可以包括易失性存储器(英文：volatile memory)，例如随机存取存储器(英文：random-access memory，缩写：RAM)；所述存储器31也可以包括非易失性存储器(英文：non-volatile memory)，例如只读存储器(英文：read-only memory，缩写：ROM)，快闪存储器(英文：flash memory)，硬盘(英文：hard disk drive，缩写：HDD)或固态硬盘(英文：solid-state drive，缩写：SSD)；所述存储器31还可以包括上述种类的存储器的组合。
所述收发器32可以为一个由发送器和接收器集成的具有收发功能的模块，也可以为一个具有独立的发送器和独立的接收器的模块，所述收发器32用于所述D2D STA与其他设备进行通信，例如， 所述收发器32在所述处理器30的控制下与AP进行通信。
当所述D2D STA运行时，所述处理器30、所述存储器31和所述收发器32可以执行图1、图3或图4所述的方法流程，具体包括：
所述收发器32，用于接收接入点AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内；所述处理器30，用于根据所述收发器32接收的所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度，当所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
所述存储器31，用于存储所述D2D STA列表的代码、所述资源指示信息的代码、所述第二D2D STA标识的代码、所述对应关系的代码、所述信号的信号强度的代码、所述预设门限值的代码、所述所述时频资源的代码，以及控制所述处理器30完成上述过程的软件程序，从而所述处理器30通过执行所述软件程序并调用所述D2D STA列表的代码、所述资源指示信息的代码、所述第二D2D STA标识的代码、所述对应关系的代码、所述信号的信号强度的代码、所述预设门限值的代码，以及所述时频资源的代码，完成上述过程。
可选的，所述处理器30，具体用于根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号。
所述处理器30，具体用于在所述时频资源上检测所述信号的信号强度。
可选的，所述收发器32，还用于在所述处理器30确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述收发器32 在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息。
所述处理器30，还用于在所述时频资源上检测所述应答消息的信号强度，当所述应答消息的信号强度大于或等于所述预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
可选的，所述收发器32接收的所述D2D STA列表中还包括所述第一D2D STA的标识，所述收发器32，还用于在接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
本发明实施例提供一种D2D STA，该D2D STA能够接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，该D2D STA能够根据第二D2D STA的标识和该对应关系，在与第二D2D STA的标识对应的时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预设门限值时，该D2D STA确定第二D2D STA为该D2D STA的D2D成员，其中，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过该D2D STA，能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
如图11所示，本发明实施例提供一种AP，该AP可以包括： 处理器40、存储器41、收发器42、以及系统总线43。所述处理器40、所述存储器41以及收发器42之间通过所述系统总线43连接并完成相互间的通信。
所述处理器40可以是一个CPU，或者是ASIC，或者是被配置成实施本发明实施例的一个或多个集成电路。
所述存储器41可以包括易失性存储器，例如RAM；所述存储器41也可以包括非易失性存储器，例如ROM，快闪存储器，HDD或SSD；所述存储器41还可以包括上述种类的存储器的组合。
所述通信接口42可以为一个由发送器和接收器集成的具有收发功能的模块，也可以为一个具有独立的发送器和独立的接收器的模块，所述收发器42用于所述AP与其他设备进行通信，例如，所述收发器42在所述处理器40的控制下与D2D STA进行通信。
当所述AP运行时，所述处理器40和所述存储器41可以执行图2、图3或图4所述的方法流程，具体包括：
所述收发器42，用于广播设D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和处理器40为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
其中，收发器42在所述处理器40的控制下，广播D2D STA列表和资源指示信息。
所述存储器41，用于存储所述D2D STA列表的代码、第二D2DSTA的标识的代码、所述资源指示信息的代码、所述时频资源的代码、所述对应关系的代码，以及控制所述处理器40完成上述过程的软件程序，从而所述处理器40通过执行所述软件程序并调用所述D2D STA列表的代码、第二D2D STA的标识的代码、所述资源指示信息的代码、所述时频资源的代码，以及所述对应关系的代码，完 成上述过程。
可选的，所述收发器42，还用于在广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA。
所述处理器40，用于根据所述收发器42接收的所述D2D功能标识确定所述STA是否为D2D STA。
所述处理器40，还用于若所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
可选的，所述收发器42广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
可选的，所述收发器42，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
可选的，所述收发器42，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述收发器42向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息。
所述收发器42，还用于根据所述请求消息，向所述第二D2D STA发送所述下行消息。
可选的，所述收发器42广播的所述D2D STA列表还包括所述多个D2D STA的数量。
或者，所述收发器42广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
本分发明实施例提供一种AP，该AP能够广播D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频 资源之间的对应关系，第二D2D STA的标识和该对应关系用于第一D2D STA确定第二D2D STA是否为第一D2D STA的D2D成员，第一D2D STA和第二D2D STA在AP的覆盖范围内。通过该AP，使得该第一D2D STA接收到AP广播的D2D STA列表后，能够确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，第一D2D STA即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
实施例五
如图12所示，为本发明实施例提供的一种通信系统，该通信系统可以包括至少一个如图5或图6所示的D2D STA，和如图7至如图9所示的任一种AP；该通信系统还可以包括至少一个如图10所示的D2D STA和如图11所示的AP。
本发明实施例提供的系统中的D2D STA能够接收AP广播的D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，该D2D STA能够根据第二D2D STA的标识和该对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测第二D2D STA向AP发送的信号的信号强度，当该信号的信号强度大于或等于预设门限值时，该D2D STA确定第二D2D STA为该D2D STA的D2D成员，其中，第一D2D STA和第二D2D STA在AP的覆盖范围内。
本发明实施例提供的系统中的AP能够广播D2D STA列表和资源指示信息，D2D STA列表中包括第二D2D STA的标识，资源指示信息包括第二D2D STA标识和AP为第二D2D STA分配的时频资源之间的对应关系，第二D2D STA的标识和该对应关系用于第一D2D STA确定第二D2D STA是否为第一D2D STA的D2D成员，第一D2D STA和第二D2D STA在AP的覆盖范围内。
可以理解的是，本发明实施例提供的通信系统中的D2D STA，能够执行如图1，图3或图4所述的D2D系统中设备之间的发现方法，该对D2D STA内的各模块或器件的具体功能和执行方法的流程可以参照如图1，图3或图4所示的实施例中的描述，此处不再赘述。
本发明实施例提供的通信系统中的AP，能够执行如图2，图3或图4所述的D2D系统中设备之间的发现方法，该对AP内的各模块或器件的具体功能和执行方法的流程可以参照如图2，图3或图4所示的实施例中的描述，此处不再赘述。
通过本发明实施例提供的通信系统，D2D STA能够根据AP广播的D2D STA列表确定第二D2D STA为一个D2D STA，并检测第二D2D STA向AP发送的信号，且当该信号的信号强度大于或等于预设门限值时，即可确定第二D2D STA为其D2D成员，不再需要AP为第二D2D STA分配专用的时频资源，以供第二D2D STA发送D2D发现信号，从而避免占用过多的时频资源，进而提高D2D系统的吞吐量。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信 连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(英文全称：Read-Only Memory，英文缩写：ROM)、随机存取存储器(英文全称：Random Access Memory，英文缩写：RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (31)

  1. 一种设备到设备D2D系统中设备之间的发现方法，其特征在于，包括：
    第一D2D站点STA接收接入点AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
    所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度；
    当所述信号的信号强度大于或等于预设门限值时，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员。
  2. 根据权利要求1所述的方法，其特征在于，所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度，包括：
    所述第一D2D STA根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
    所述第一D2D STA在所述时频资源上检测所述信号的信号强度。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员之后，所述方法还包括：
    若所述第一D2D STA在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则所述第一D2D STA向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应 答消息；
    所述第一D2D STA在所述时频资源上检测所述应答消息的信号强度；
    当所述应答消息的信号强度大于或等于所述预设门限值时，所述第一D2D STA确定所述第二D2D STA为所述第一D2D STA的D2D成员。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述D2D STA列表中还包括所述第一D2D STA的标识，
    所述第一D2D STA接收AP广播的D2D STA列表和资源指示信息之前，所述方法还包括：
    所述第一D2D STA向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
  5. 一种设备到设备D2D系统中设备之间的发现方法，其特征在于，包括：
    接入点AP广播D2D站点STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
  6. 根据权利要求5所述的方法，其特征在于，所述AP广播D2D STA列表和资源指示信息之前，所述方法还包括：
    所述AP接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA；
    所述AP根据所述D2D功能标识确定所述STA是否为D2D STA；
    若所述AP确定所述STA为D2D STA，则所述AP将所述STA的标识添加到所述D2D STA列表中。
  7. 根据权利要求5或6所述的方法，其特征在于，
    所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
  8. 根据权利要求5-7任一项所述的方法，其特征在于，所述AP广播D2D STA列表，包括：
    所述AP将所述D2D STA列表携带在预定的管理控制广播帧中广播。
  9. 根据权利要求5-8任一项所述的方法，其特征在于，所述方法还包括：
    所述AP接收第一D2D STA发送的请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
    所述AP根据所述请求消息，向所述第二D2D STA发送所述下行消息。
  10. 根据权利要求5-9任一项所述的方法，其特征在于，
    所述D2D STA列表还包括所述多个D2D STA的数量；或者，
    所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
  11. 一种设备到设备D2D站点STA，其特征在于，包括：
    接收单元，用于接收接入点AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
    检测单元，用于根据所述接收单元接收的所述第二D2D STA的标识和所述对应关系，在与第二D2D STA的标识对应的所述时频资 源上检测所述第二D2D STA向所述AP发送的信号的信号强度；
    确定单元，用于当所述检测单元检测到所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
  12. 根据权利要求11所述的D2D STA，其特征在于，
    所述检测单元，具体用于根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
    所述检测单元，具体用于在所述时频资源上检测所述信号的信号强度。
  13. 根据权利要求11或12所述的D2D STA，其特征在于，所述D2D STA还包括发送单元，
    所述发送单元，用于在所述确定单元确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述接收单元在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
    所述检测单元，还用于在所述时频资源上检测所述应答消息的信号强度；
    所述确定单元，还用于当所述检测单元检测到所述应答消息的信号强度大于或等于所述预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
  14. 根据权利要求13所述的D2D STA，其特征在于，所述接收单元接收的所述D2D STA列表中还包括所述第一D2D STA的标识，
    所述发送单元，还用于在所述接收单元接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述 第一D2D STA的标识添加到所述D2D STA列表中。
  15. 一种接入点AP，其特征在于，包括：
    广播单元，用于广播设备到设备D2D站点STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和分配单元为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
  16. 根据权利要求15所述的AP，其特征在于，所述AP还包括接收单元、确定单元和添加单元，
    所述接收单元，用于在所述广播单元广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述STA是否为D2D STA；
    所述确定单元，用于根据所述接收单元接收的所述D2D功能标识确定所述STA是否为D2D STA；
    所述添加单元，用于若确定单元确定所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
  17. 根据权利要求15或16所述的AP，其特征在于，
    所述广播单元广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
  18. 根据权利要求15-17任一项所述的AP，其特征在于，
    所述广播单元，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
  19. 根据权利要求16-18任一项所述的AP，其特征在于，所述AP还包括发送单元，
    所述接收单元，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述发送单元向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
    所述发送单元，用于根据所述接收单元接收的所述请求消息，向所述第二D2D STA发送所述下行消息。
  20. 根据权利要求15-19任一项所述的AP，其特征在于，
    所述广播单元广播的所述D2D STA列表还包括所述多个D2D STA的数量；或者，
    所述广播单元广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
  21. 一种设备到设备D2D站点STA，其特征在于，包括：
    收发器，用于接收接入点AP广播的D2D STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和所述AP为所述第二D2D STA分配的时频资源之间的对应关系，所述D2D STA和所述第二D2D STA在所述AP的覆盖范围内；
    处理器，用于根据所述收发器接收的所述第二D2D STA的标识和所述对应关系，在与所述第二D2D STA的标识对应的所述时频资源上检测所述第二D2D STA向所述AP发送的信号的信号强度，当所述信号的信号强度大于或等于预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
  22. 根据权利要求21所述的D2D STA，其特征在于，
    所述处理器，具体用于根据所述第二D2D STA的标识和所述对应关系，确定与所述第二D2D STA的标识对应的所述时频资源，所述第二D2D STA在所述时频资源上向所述AP发送所述信号；
    所述处理器，具体用于在所述时频资源上检测所述信号的信号强度。
  23. 根据权利要求21或22所述的D2D STA，其特征在于，
    所述收发器，还用于在所述处理器确定所述第二D2D STA为所述D2D STA的D2D成员之后，若所述收发器在预设时间段内未接收到所述第二D2D STA向所述AP发送的信号，则向所述AP发送请求消息，所述请求消息用于请求所述AP向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
    所述处理器，还用于在所述时频资源上检测所述应答消息的信号强度，当所述应答消息的信号强度大于或等于所述预设门限值时，确定所述第二D2D STA为所述D2D STA的D2D成员。
  24. 根据权利要求21-23任一项所述的D2D STA，其特征在于，所述收发器接收的所述D2D STA列表中还包括所述第一D2D STA的标识，
    所述收发器，还用于在接收AP广播的D2D STA列表和资源指示信息之前，向所述AP发送关联请求帧，所述关联请求帧中携带D2D功能标识，所述D2D功能标识用于表征所述第一D2D STA为D2D STA，所述D2D功能标识用于指示所述AP将所述第一D2D STA的标识添加到所述D2D STA列表中。
  25. 一种接入点AP，其特征在于，包括：
    收发器，用于广播设备到设备D2D站点STA列表和资源指示信息，所述D2D STA列表中包括第二D2D STA的标识，所述资源指示信息包括所述第二D2D STA标识和处理器为所述第二D2D STA分配的时频资源之间的对应关系，所述第二D2D STA的标识和所述对应关系用于第一D2D STA确定所述第二D2D STA是否为所述第一D2D STA的D2D成员，所述第一D2D STA和所述第二D2D STA在所述AP的覆盖范围内。
  26. 根据权利要求25所述的AP，其特征在于，
    所述收发器，还用于在广播D2D STA列表和资源指示信息之前，接收STA发送的关联请求帧，所述关联请求帧中携带D2D功能标识， 所述D2D功能标识用于表征所述STA是否为D2D STA；
    所述处理器，用于根据所述收发器接收的所述D2D功能标识确定所述STA是否为D2D STA；
    所述处理器，还用于若所述STA为D2D STA，则将所述STA的标识添加到所述D2D STA列表中。
  27. 根据权利要求25或26所述的AP，其特征在于，
    所述收发器广播的所述D2D STA列表包括多个D2D STA的标识，所述多个D2D STA为所述AP的覆盖范围内的所有D2D STA，所述第一D2D STA和所述第二D2D STA为所述多个D2D STA中的任意两个D2D STA。
  28. 根据权利要求25-27任一项所述的AP，其特征在于，
    所述收发器，具体用于将所述D2D STA列表携带在预定的管理控制广播帧中广播。
  29. 根据权利要求25-28任一项所述的AP，其特征在于，
    所述收发器，还用于接收第一D2D STA发送的请求消息，所述请求消息用于请求所述收发器向所述第二D2D STA发送下行消息，所述下行消息用于指示所述第二D2D STA向所述AP发送应答消息；
    所述收发器，还用于根据所述请求消息，向所述第二D2D STA发送所述下行消息。
  30. 根据权利要求25-29任一项所述的AP，其特征在于，
    所述收发器广播的所述D2D STA列表还包括所述多个D2D STA的数量；或者，
    所述收发器广播的所述D2D STA列表还包括所述多个D2D STA的数量和类型标识，所述类型标识用于指示所述多个D2D STA的标识的类型。
  31. 一种通信系统，其特征在于，包括：
    如权利要求11-14任一项所述的设备到设备D2D站点STA，和如权利要求15-20任一项所述的接入点AP；或者，
    如权利要求21-24任一项所述的D2D STA，和如权利要求25-30 任一项所述的AP。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013108219A1 (en) * 2012-01-20 2013-07-25 Renesas Mobile Corporation Device -to-device discovery resource allocation
CN103906174A (zh) * 2012-12-26 2014-07-02 华为技术有限公司 设备发现方法及终端
CN104105083A (zh) * 2013-04-03 2014-10-15 上海贝尔股份有限公司 邻居发现方法和设备
WO2015018239A1 (zh) * 2013-08-08 2015-02-12 中兴通讯股份有限公司 设备发现方法和用户设备、网络侧设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013108219A1 (en) * 2012-01-20 2013-07-25 Renesas Mobile Corporation Device -to-device discovery resource allocation
CN103906174A (zh) * 2012-12-26 2014-07-02 华为技术有限公司 设备发现方法及终端
CN104105083A (zh) * 2013-04-03 2014-10-15 上海贝尔股份有限公司 邻居发现方法和设备
WO2015018239A1 (zh) * 2013-08-08 2015-02-12 中兴通讯股份有限公司 设备发现方法和用户设备、网络侧设备

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