WO2016054772A1 - 一种无线局域网中的通信方法、通信设备和通信系统 - Google Patents

一种无线局域网中的通信方法、通信设备和通信系统 Download PDF

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Publication number
WO2016054772A1
WO2016054772A1 PCT/CN2014/088137 CN2014088137W WO2016054772A1 WO 2016054772 A1 WO2016054772 A1 WO 2016054772A1 CN 2014088137 W CN2014088137 W CN 2014088137W WO 2016054772 A1 WO2016054772 A1 WO 2016054772A1
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Prior art keywords
transmission frame
transmission
preamble
training domain
control signaling
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PCT/CN2014/088137
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English (en)
French (fr)
Inventor
朱俊
林英沛
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华为技术有限公司
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Priority to PCT/CN2014/088137 priority Critical patent/WO2016054772A1/zh
Publication of WO2016054772A1 publication Critical patent/WO2016054772A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a communication method, a communication device, and a communication system in a wireless local area network.
  • the preamble is one or more groups of bits at the beginning of the transmission frame, and generally includes a short training domain STF, a long training domain LTF, and a control signaling SIG, wherein the short training domain STF is used for gain control, time synchronization, and frequency synchronization.
  • the long training domain LTF is used for channel estimation; the control signaling SIG is used to indicate the coding modulation mode, the transmission duration, etc., therefore, the receiver can perform a series of control according to the preamble of the transmission frame, thereby acquiring the transmission information of the transmission frame. .
  • D2D (device to device) transmission refers to the realization of a direct communication connection between two communication devices in a wireless communication network.
  • the preamble of the transmission frame uses the same preamble format in the initial stage and the subsequent stage of the D2D (device to device) transmission.
  • the physical layer preamble format specified by the 802.11N standard shown in Fig. 1 however, in the subsequent stage of D2D transmission, some training fields in the preamble are unnecessary, for example, when D2D transmission, the channel between the two stations is basically It does not change. Therefore, the long training domain LTF for channel estimation is unnecessary. If the same preamble format is used throughout the D2D transmission, unnecessary physical layer overhead is brought down and D2D transmission is reduced. Throughput.
  • Embodiments of the present invention provide a communication method, a communication device, and a communication system in a wireless local area network, which can reduce physical layer overhead in a subsequent stage of D2D transmission and improve throughput of D2D transmission.
  • a first aspect of the embodiments of the present invention provides a communication device in a wireless local area network, where the communication device is a first non-access point site, and the communication device includes:
  • a transmission frame sending unit configured to send a first transmission frame to a second non-access point station at a beginning stage of the D2D transmission, where the preamble of the first transmission frame includes a first short training domain STF and a first long training The domain LTF and the first control signaling SIG;
  • a transmission frame receiving unit configured to receive a second transmission frame returned by the second non-access point station when receiving the first transmission frame, where a preamble of the second transmission frame includes a second short training field STF, second long training domain LTF and second control signaling SIG;
  • the transmission frame sending unit is further configured to: send, in a subsequent stage of the D2D transmission, a third transmission frame to the second non-access point station, where the preamble of the third transmission frame includes at least a third control Signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF;
  • the transmission frame receiving unit is further configured to receive a fourth transmission frame that is returned when the second non-access point station receives the third transmission frame, where the preamble of the fourth transmission frame includes at least a first
  • the fourth control signaling SIG does not include one or both of the short training domain STF and the long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG, and the fourth transmission frame Only the fourth control signaling SIG is included in the preamble.
  • the transmission frame sending unit in a subsequent stage of the D2D transmission, if the preamble of the third transmission frame sent by the transmission frame sending unit is only The third control signaling SIG is not able to meet the transmission requirement, and the transmission frame sending unit is further configured to:
  • the preamble of the third transmission frame includes the third control signaling SIG, and the third short training domain STF and/or the third long training domain LTF.
  • the third control signaling SIG and the third short training are included in a preamble of the third transmission frame.
  • the domain STF includes only the fourth control signaling SIG and the fourth short training domain STF in the preamble of the fourth transmission frame.
  • the second aspect of the embodiment of the present invention further provides a communication device in a wireless local area network, where the communication device is a second non-access point site, and the communication device includes:
  • a transmission frame receiving unit configured to receive, at a beginning stage of the D2D transmission, a first transmission frame sent by the first non-access point station, where the preamble of the first transmission frame includes a first short training domain STF and a first length Training domain LTF and first control signaling SIG;
  • a transmission frame sending unit configured to: when the first transmission frame is received, to the first non-access point The station returns a second transmission frame, where the preamble of the second transmission frame includes a second short training domain STF, a second long training domain LTF and a second control signaling SIG;
  • the transmission frame receiving unit is further configured to: at a subsequent stage of the D2D transmission, receive a third transmission frame sent by the first non-access point station, where a preamble of the third transmission frame includes at least a third Controlling the signaling SIG and not including one or both of the short training domain STF and the long training domain LTF;
  • the transmission frame sending unit is further configured to: when receiving the third transmission frame, return a fourth transmission frame to the first non-access point site, where the preamble of the fourth transmission frame includes at least a first
  • the fourth control signaling SIG does not include one or both of the short training domain STF and the long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG, and the fourth transmission frame Only the fourth control signaling SIG is included in the preamble.
  • the transmission frame receiving unit in a subsequent stage of the D2D transmission, if the preamble of the third transmission frame received by the transmission frame receiving unit is only The third control signaling SIG is not able to meet the transmission requirement, and the transmission frame receiving unit is further configured to:
  • Receiving, by the first non-access point station, the third transmission frame, the preamble of the third transmission frame includes the third control signaling SIG, and the third short training domain STF and/ Or the third long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG and the third short training.
  • the domain STF includes only the fourth control signaling SIG and the fourth short training domain STF in the preamble of the fourth transmission frame.
  • a third aspect of the embodiments of the present invention provides a communication method in a wireless local area network, including:
  • the first non-access point station transmits a first transmission frame to the second non-access point station, and receives the second transmission frame returned by the second non-access point station, the
  • the preamble of a transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG, where the preamble of the second transmission frame includes a second short training domain STF and a second long Training domain LTF and second control signaling SIG;
  • the first non-access point site is to the second non-access
  • the point station sends a third transmission frame, and receives a fourth transmission frame returned by the second non-access point station;
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF;
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG, and the fourth transmission frame Only the fourth control signaling SIG is included in the preamble.
  • the third non-access point station in a subsequent stage of the D2D transmission, if the third non-access point station sends the third transmission frame
  • the preamble only includes that the third control signaling SIG cannot meet the transmission requirement, and the method further includes:
  • the preamble of the third transmission frame includes only the third control signaling SIG and the third short training
  • the domain STF includes only the fourth control signaling SIG and the fourth short training domain STF in the preamble of the fourth transmission frame.
  • a fourth aspect of the embodiments of the present invention provides a communication method in a wireless local area network, including:
  • the second non-access point station receives the first transmission frame sent by the first non-access point station, and returns a second transmission frame to the first non-access point station, where the The preamble of a transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG, where the preamble of the second transmission frame includes a second short training domain STF and a second long Training domain LTF and second control signaling SIG;
  • the second non-access point station receives a third transmission frame sent by the first non-access point station, and returns a fourth to the first non-access point station.
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF;
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include short training One or both of the domain STF and the long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG, and the fourth transmission frame Only the fourth control signaling SIG is included in the preamble.
  • the method further includes:
  • the third transmission frame that is retransmitted by the first non-access point station, where a preamble of the third transmission frame includes the third control signaling SIG, and The third short training domain STF and/or the third long training domain LTF.
  • the preamble of the third transmission frame includes only the third control signaling SIG and the third short training.
  • the domain STF includes only the fourth control signaling SIG and the fourth short training domain STF in the preamble of the fourth transmission frame.
  • a fifth aspect of the embodiments of the present invention further provides a communication device in a wireless local area network, where the communication device includes a wireless signal transceiver device, a memory, and a processor, wherein the memory stores a set of program codes, and processes The program is used to call the program code stored in the memory to perform the following operations:
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF;
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • a sixth aspect of the embodiments of the present invention further provides a communication device in a wireless local area network, where the communication device includes a wireless signal transceiver device, a memory, and a processor, wherein the memory stores a set of program codes, and processes The program is used to call the program code stored in the memory to perform the following operations:
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF;
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • a seventh aspect of the embodiments of the present invention further provides a computer storage medium storing a program, where the program includes some or all of the steps of the communication method in the wireless local area network provided by the third aspect.
  • the eighth aspect of the embodiments of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the steps of the communication method in the wireless local area network provided by the fourth aspect.
  • a ninth aspect of the embodiments of the present invention further provides a communication system in a wireless local area network, where the communication system includes a communication device and a communication device, where
  • the communication device is as in the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, or the communication in the third possible implementation of the first aspect device;
  • the communication device is as in the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, or the communication in the third possible implementation of the second aspect device.
  • the preamble of the transmitted transmission frame includes the short training domain STF and the long training domain.
  • LTF and control signaling SIG in the subsequent stage of D2D transmission, the preamble of the transmitted transmission frame contains the control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF, which reduces the D2D transmission.
  • the physical layer overhead of the subsequent stages improves the throughput of D2D transmission.
  • FIG. 1 is a schematic structural diagram of a physical layer preamble format specified by the prior art 802.11N standard
  • FIG. 2 is a schematic flowchart of a communication method in a wireless local area network according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a preamble in D2D transmission according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of still another preamble in D2D transmission according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of still another preamble in D2D transmission according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of another communication method in a wireless local area network according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of still another communication method in a wireless local area network according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of still another preamble in D2D transmission according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a communication device in a wireless local area network according to the present invention.
  • FIG. 11 is a schematic structural diagram of a communication device in another wireless local area network according to the present invention.
  • FIG. 12 is a schematic structural diagram of a communication device in a wireless local area network according to the present invention.
  • FIG. 13 is a schematic structural diagram of a communication device in another wireless local area network according to the present invention.
  • FIG. 14 is a schematic structural diagram of a communication system in a wireless local area network according to the present invention.
  • FIG. 2 is a schematic flowchart diagram of a communication method in a wireless local area network according to an embodiment of the present invention.
  • the embodiments of the present invention are mainly described from the first non-access point site side.
  • the communication flow in the wireless local area network as shown in FIG. 2 may at least include:
  • the first non-access point station sends a first transmission frame to the second non-access point station, and receives the second transmission frame returned by the second non-access point station.
  • the preamble of the first transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG, where the preamble of the second transmission frame includes a second short training domain STF, Two long training domain LTF and second control signaling SIG.
  • the short training domain STF is used for the gain control and the time frequency synchronization control; the long training domain LTF is used for the channel estimation; the control signaling SIG is used to indicate the coded modulation mode, the transmission duration, etc.; it should be noted that, in the embodiment of the present invention, A short training domain STF and a second short training domain STF may be the same or different; the first long training domain LTF and the second long training domain LTF may be the same or different; the first control signaling SIG and the second control signaling SIG The invention may be the same or different, and the invention is not limited.
  • the first non-access point site (hereinafter referred to as STA1) is the initiator of the D2D transmission, and the second non-access point site (hereinafter referred to as STA2) is the receiver of the D2D transmission.
  • the initial phase of D2D transmission may be the first interaction after STA1 and STA2 establish a D2D transmission link, for example, STA1 sends an RTS (request to send) frame, and STA2 returns CTS (clear to send).
  • RTS request to send
  • CTS clear to send
  • Frame for example, STA1 sends a data frame, and STA2 returns an ACK frame;
  • the initial phase of the D2D transmission may also be the first interaction after the STA2 and the STA2 establish the D2D transmission link until the Nth (N ⁇ 2) interactions.
  • N ⁇ M M interactions
  • the first phase of the D2D transmission in the embodiment of the present invention is taken as an example of establishing the first interaction after the D2D transmission link, wherein the first phase of the D2D transmission is to establish the first interaction after the D2D transmission link until the Nth ( For the case of N ⁇ 2) interactions, please refer to the specific embodiment shown in FIG.
  • STA1 sends a first transmission frame to STA2, and a preamble of the first transmission frame.
  • the first short training domain STF, the first long training domain LTF and the first control signaling SIG are included to enable STA2 to record gain control information, time frequency synchronization information, and channel information of STA1 to STA2 according to a preamble of the first transmission frame.
  • the STA1 receives the second transmission frame sent by the STA2, and the preamble of the second transmission frame includes the second short training domain STF, the second long training domain LTF, and the second control signaling SIG, and the STA1 may also be according to the second transmission.
  • the preamble of the frame records gain control information, time frequency synchronization information, and channel information of STA2 to STA1.
  • the first non-access point station sends a third transmission frame to the second non-access point station, and receives the second non-access point site return.
  • a fourth transmission frame where the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF, where the fourth transmission frame
  • the preamble includes at least a fourth control signaling SIG and does not include one or both of the short training domain STF and the long training domain LTF.
  • FIG. 3 is a schematic flowchart of a preamble according to an embodiment of the present invention, where the left side of the dotted line is the beginning stage of the D2D transmission, and the right side of the dotted line is the subsequent stage of the D2D transmission.
  • the third transmission frame and the fourth transmission frame are described in the subsequent stage of D2D transmission, and the other transmission frames are deduced by the same, and the present invention cannot be limited thereto.
  • the third transmission frame sent by STA1 to STA2 includes only the third control signaling SIG, does not include the short training domain STF and the long training domain LTF, and STA1 receives the fourth transmission frame sent by STA2. Only the fourth control signaling SIG is included, and the short training domain STF and the long training domain LTF are not included, as shown in FIG.
  • both STA1 and STA2 can perform gain control and time-frequency synchronization control according to the respective recorded gain control information, time-frequency synchronization information and channel information, and then extract data information in the transmission frame according to the channel information.
  • the preamble of the transmission frame transmitted by STA1 and STA2 communicates only the control signaling SIG, and does not include the short training domain STF and the long training domain LTF.
  • the preamble of the entire phase of the D2D transmission Both the short training domain STF and the long training domain LTF reduce the physical layer overhead of the subsequent stages of D2D transmission and improve the throughput of D2D transmission.
  • the preamble of the third transmission frame sent by STA1 may resend the third transmission frame and resend the transmission.
  • the preamble of the third transmission frame includes a third control signaling SIG and, a third short training domain STF and/or a third long training domain LTF.
  • the preamble of the received fourth transmission frame After transmitting the third transmission frame including only the third control signaling SIG preamble, the preamble of the received fourth transmission frame includes a short training domain STF and/or in addition to the fourth control signaling SIG.
  • the long training domain LTF, STA1 can determine that STA2 cannot obtain the data in the third transmission frame, that is, it is determined that the preamble of the third transmission frame only contains the third control signaling SIG cannot satisfy the transmission requirement, and STA1 transmits the third transmission again.
  • the preamble of the third transmission frame that is transmitted again includes the third control signaling SIG, and the third short training domain STF and/or the third long training domain LTF.
  • FIG. 4 is a schematic flowchart diagram of another preamble according to an embodiment of the present invention, where a transport frame carrying data1 is a third transport frame.
  • FIG. 5 is a schematic flowchart of still another preamble according to the embodiment of the present invention, where the transmission frame carrying data1 is a third transmission frame.
  • the preamble of the third transmission frame sent by the STA1 to the STA2 includes only the third control signaling SIG and the third short training domain STF, and the fourth transmission frame sent by the STA2 received by the STA1.
  • the preamble also includes only the fourth control signaling SIG and the fourth short training domain STF.
  • STA1 Since, at the beginning of the D2D transmission, STA1 records the channel information of STA2 to STA1, and STA2 also records the channel information of STA1 to STA2, in the subsequent stage of D2D transmission, STA1 Both the STA2 and the STA2 can extract the data information in the transmission frame according to the channel information recorded by the respective ones.
  • the preamble of the transmission frame that the STA1 and the STA2 communicate with each other can only include the short training domain STF and the control signaling.
  • the SIG does not include the long training domain LTF.
  • the preamble of the entire phase of the D2D transmission includes the long training domain LTF, which reduces the physical layer overhead of the subsequent phase of the D2D transmission and improves the throughput of the D2D transmission.
  • FIG. 6 is a schematic flowchart diagram of still another preamble provided by the embodiment of the present invention.
  • the preamble of the transmission frame sent by STA1 and STA2 may also be combined by other forms.
  • the preamble of the third transmission frame includes only the third short training domain STF.
  • the third control signaling SIG the preamble of the fourth transmission frame includes only the fourth control signaling SIG; for example, the preamble of the third transmission frame includes only the third control signaling SIG, and the preamble of the fourth transmission frame
  • the code includes only the fourth short training domain STF and the fourth control signaling SIG, etc., and other implementations derived by the above manner are within the scope of the invention.
  • the preamble of the transmitted transmission frame includes the short training domain STF, the long training domain LTF and the control signaling SIG, in the subsequent stage of D2D transmission.
  • the preamble of the transmitted transmission frame includes the control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • the entire phase preamble of the D2D transmission includes short training. In the domain STF and the long training domain, the physical layer overhead of the subsequent stage of D2D transmission is reduced, and the throughput of the D2D transmission is improved.
  • FIG. 7 is a schematic flowchart diagram of another communication method in a wireless local area network according to an embodiment of the present invention.
  • the embodiments of the present invention are mainly described from the perspective of a communication system.
  • the communication flow in the wireless local area network as shown in FIG. 2 may at least include:
  • the STA1 sends a first transmission frame to the STA2, where the preamble of the first transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG.
  • the first stage in the embodiment of the present invention is taken as an example of establishing the first interaction after the D2D transmission link.
  • the STA2 receives the first transmission frame, where the preamble of the first transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG, and the STA2 may be according to the first transmission frame.
  • the preamble records gain control information, time frequency synchronization information, and channel information of STA1 to STA2.
  • the STA2 returns a second transmission frame to the STA1, where the preamble of the second transmission frame includes a second short training domain STF, a second long training domain LTF, and a second control signaling SIG.
  • the STA1 receives the second transmission frame, where the preamble of the second transmission frame includes a second short training domain STF, a second long training domain LTF and a second control signaling SIG, and the STA1 can record according to the preamble of the second transmission frame.
  • the STA1 sends a third transmission frame to the STA2, where the preamble of the third transmission frame includes only the third control signaling SIG.
  • the STA2 returns a fourth transmission frame to the STA1, where the preamble of the fourth transmission frame includes only the fourth control signaling SIG.
  • STA2 At the beginning of the D2D transmission, STA2 records the gain control information, the time-frequency synchronization information, and the channel information of STA1 to STA2. If STA2 obtains the first according to the recorded gain control information, time-frequency synchronization information, and channel information of STA1 to STA2. For the data information of the three transmission frames, the preamble of the fourth transmission frame returned by STA2 to STA1 includes only the fourth control signaling SIG.
  • the STA1 sends a fifth transmission frame to the STA2, where the preamble of the fifth transmission frame includes only the fifth control signaling SIG.
  • the STA1 receives the fourth transmission frame sent by the STA2, and detects that the fourth transmission frame includes only the fourth control signaling SIG, and the preamble of the fifth transmission frame that the STA1 sends to the STA2 may include only the fifth control information SIG.
  • STA2 cannot obtain the data information in the fifth transmission frame, and STA2 returns a sixth transmission frame to STA1, where the preamble of the sixth transmission frame includes a sixth control information order, and a sixth short training field STF and/or The sixth long training domain LTF.
  • STA2 At the beginning of the D2D transmission, STA2 records the gain control information, the time-frequency synchronization information, and the channel information of STA1 to STA2. If STA2 cannot obtain the first according to the recorded gain control information, time-frequency synchronization information, and channel information of STA1 to STA2.
  • the preamble of the sixth transmission frame returned by STA2 to STA1 includes a sixth control information order, and a sixth short training domain STF and/or a sixth long training domain LTF.
  • the STA1 sends the fifth transmission frame to the STA2 again, and the preamble of the fifth transmission frame that is sent again includes the fifth control signaling SIG, and the fifth short training domain STF and/or the fifth long training domain. LTF.
  • STA1 receives the sixth transmission frame sent by STA2, and detects that the sixth transmission frame includes the sixth short training domain STF and/or the sixth long training domain LTF, in addition to the sixth control signaling SIG, STA1 may Determining that the transmitted fifth transmission frame containing only the preamble of the fifth control signaling SIG does not satisfy the transmission requirement, STA1 transmits the fifth transmission frame again, and the preamble of the fifth transmission frame includes the fifth control signaling SIG And the fifth short training domain STF.
  • the STA2 returns a seventh transmission frame to the STA1, where the preamble of the seventh transmission frame includes only the seventh control signaling SIG.
  • STA2 may obtain the fifth according to the fifth control signaling SIG included in the preamble of the fifth transmission frame, and the fifth short training domain STF and/or the fifth long training domain LTF.
  • the preamble of the seventh transmission frame returned by STA2 to STA1 includes only the seventh control signaling SIG.
  • the fifth transmission frame in the embodiment of the present invention is the last transmission frame of the D2D transmission, and therefore, when receiving the seventh transmission frame, STA1 ends the D2D transmission.
  • the preamble of the transmitted transmission frame includes the short training domain STF, the long training domain LTF and the control signaling SIG in the subsequent stage of D2D transmission.
  • the preamble of the transmitted transmission frame includes the control signaling SIG, and does not include the short training domain STF and the long training domain LTF.
  • the entire phase preamble of the D2D transmission includes the short training domain STF and the long training domain. In this case, the physical layer overhead of the subsequent stage of D2D transmission is reduced, and the throughput of D2D transmission is improved.
  • FIG. 8 is a schematic flowchart diagram of another communication method in a wireless local area network according to an embodiment of the present invention.
  • the initial phase of the D2D transmission is the first interaction between the STA1 and the STA2 after establishing the D2D transmission link until the Nth (N ⁇ 2) interactions. If the STA1 and the STA2 establish a D2D transmission link, there are M interactions. N ⁇ M.
  • the first phase of D2D transmission in the embodiment of the present invention is taken as an example of establishing a first interaction and a second interaction after a D2D transmission link.
  • the communication flow in the wireless local area network as shown in FIG. 8 may at least include:
  • the first non-access point station sends a first transmission frame to the second non-access point station, and receives the second transmission frame returned by the second non-access point station.
  • the preamble of the first transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG
  • the preamble of the second transmission frame includes a second short training domain STF, and a second Long training domain LTF and second control signaling SIG.
  • the STA1 sends a first transmission frame to the STA2, where the preamble of the first transmission frame includes a first short training domain STF, a first long training domain LTF, and a first control signaling SIG, so that the STA2 is configured according to the
  • the preamble of a transmission frame records gain control information, time frequency synchronization information, and channel information of STA1 to STA2;
  • STA1 receives a second transmission frame sent by STA2, and the preamble of the second transmission frame includes a second short training domain STF
  • the second long training domain LTF and the second control signaling SIG, STA1 may also record gain control information, time frequency synchronization information, and channel information of STA2 to STA1 according to the preamble of the second transmission frame.
  • the first short training domain STF and the second short training domain STF may be the same or different; the first long training domain LTF and the second long training domain LTF may be the same or different;
  • a control signaling SIG and a second control signaling SIG may be the same or different, and the invention is not limited.
  • the first non-access point station sends a third transmission frame to the second non-access point station, and receives a fourth transmission frame returned by the second non-access point station, where the third transmission frame is forwarded.
  • the code includes a third short training domain STF, a third long training domain LTF, and a third control signaling SIG, where the preamble of the fourth transmission frame includes a fourth short training domain STF, a fourth long training domain LTF, and a third Four control signaling SIG.
  • the STA1 sends a third transmission frame to the STA2, where the preamble of the third transmission frame includes a third short training domain STF, a third long training domain LTF, and a third control signaling SIG, and the STA2 may be according to the third.
  • the preamble of the transmission frame updates the recorded gain control information, the time frequency synchronization information, and the channel information of STA1 to STA2;
  • STA1 receives the fourth transmission frame sent by STA2, and the preamble of the fourth transmission frame includes the fourth short training field.
  • the STF, the fourth long training domain LTF, and the fourth control signaling SIG, STA1 may update the recorded gain control information, time frequency synchronization information, and channel information of STA2 to STA1 according to the preamble of the fourth transmission frame.
  • the third short training domain STF and the fourth short training domain STF may be the same or different; the third long training domain LTF and the fourth long training domain LTF may be the same or different;
  • the third control signaling SIG and the fourth control signaling SIG may be the same or different, and the present invention is not limited thereto.
  • the first non-access point station sends a fifth transmission frame to the second non-access point station, and receives the second non-access point site return a sixth transmission frame, where the preamble of the fifth transmission frame includes at least a fifth control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF, where the sixth transmission frame
  • the preamble includes at least a sixth control signaling SIG and does not include one or both of the short training domain STF and the long training domain LTF.
  • the third transmission frame sent by STA1 starts as a subsequent stage of D2D transmission; if STA1 and STA2 have two interactions, The fifth transmission frame sent by STA1 starts with the subsequent stage of D2D transmission. If there are three interactions between STA1 and STA2, the seventh transmission frame sent by STA1 starts as the subsequent stage of D2D transmission, and so on.
  • FIG. 9 Another schematic diagram of a preamble according to the embodiment of the present invention is shown in FIG. 9, wherein the left side of the dotted line is the beginning stage of the D2D transmission, and the right side of the dotted line is the subsequent stage of the D2D transmission.
  • the fifth transmission frame and the sixth transmission frame are described in the subsequent stage of D2D transmission, and the other transmission frames are deduced by the same, and the present invention cannot be limited thereto.
  • the fifth transmission frame sent by STA1 to STA2 includes only the fifth control signaling SIG, does not include the short training domain STF and the long training domain LTF, and STA1 receives the sixth transmission frame sent by STA2. Only the sixth control signaling SIG is included, and the short training domain STF and the long training domain LTF are not included, as shown in FIG.
  • the STA1 may resend the fifth transmission frame and resend the transmission.
  • the preamble of the fifth transmission frame includes a fifth control signaling SIG, and a fifth short training domain STF and/or a fifth long training domain LTF.
  • the preamble of the fifth transmission frame sent by the STA1 to the STA2 includes only the fifth control signaling SIG and the fifth short training domain STF, and the sixth transmission frame sent by the STA2 received by the STA1.
  • the preamble also includes only the sixth control signaling SIG and the sixth short training domain STF.
  • the preamble of the transmitted transmission frame includes the short training domain STF, the long training domain LTF and the control signaling SIG in the subsequent stage of D2D transmission.
  • the preamble of the transmitted transmission frame contains the control signaling SIG, and does not include short training One or both of the domain STF and the long training domain LTF, and in the prior art, the entire phase preamble of the D2D transmission includes the short training domain STF and the long training domain, and the physical layer of the subsequent phase of the D2D transmission is reduced. Overhead, increasing the throughput of D2D transmission.
  • FIG. 10 is a schematic structural diagram of a communication device in a wireless local area network according to an embodiment of the present invention.
  • the communication device provided by the embodiment of the present invention may include a mobile phone, a tablet computer, a notebook computer, or the like.
  • the communication device 100 shown in FIG. 10 may include at least a transmission frame transmitting unit 101 and a transmission frame receiving unit 102, where:
  • the transmission frame sending unit 101 is configured to send, at a beginning stage of the D2D transmission, a first transmission frame to a second non-access point station (Non-AP STA), where the preamble of the first transmission frame includes the first short training The domain STF, the first long training domain LTF and the first control signaling SIG.
  • Non-AP STA non-access point station
  • the transmission frame receiving unit 102 is configured to receive a second transmission frame returned by the second non-access point station when receiving the first transmission frame, where the preamble of the second transmission frame includes a second short training The domain STF, the second long training domain LTF, and the second control signaling SIG.
  • the transmission frame sending unit 101 is further configured to: send, in a subsequent stage of the D2D transmission, a third transmission frame to the second non-access point station, where the preamble of the third transmission frame includes at least a third
  • the signaling SIG is controlled and does not include either or both of the short training domain STF and the long training domain LTF.
  • the transmission frame receiving unit 102 is further configured to receive a fourth transmission frame that is returned when the second non-access point station receives the third transmission frame, where the preamble of the fourth transmission frame includes at least The fourth control signaling SIG does not include one or both of the short training domain STF and the long training domain LTF.
  • the third transmission frame transmitted by the transmission frame transmitting unit 101 starts as a subsequent stage of D2D transmission; if, STA1 and STA2 exist twice.
  • the fifth transmission frame sent by the transmission frame sending unit 101 is started as a subsequent stage of D2D transmission.
  • the seventh transmission frame sent by the transmission frame sending unit 101 starts to be D2D transmission. Subsequent stages, and so on.
  • the first phase of the D2D transmission in the embodiment of the present invention is taken as an example of establishing the first interaction after the D2D transmission link.
  • the preamble of the third transmission frame sent by the transmission frame sending unit 101 includes only the third control signaling SIG; the transmission frame receiving unit The preamble of the fourth transmission frame received by 102 includes only the fourth control signaling SIG.
  • the transmission frame sending unit 102 is further configured to:
  • the preamble of the third transmission frame sent by the transmission frame sending unit 101 includes only the third control signaling SIG and the third short training domain STF;
  • the preamble of the fourth transmission frame received by the transmission frame receiving unit 102 includes only the fourth control signaling SIG and the fourth short training domain STF.
  • the preamble of the third transmission frame sent by the transmission frame sending unit 101 includes only the third control signaling SIG and the third The short training field STF; the preamble of the fourth transmission frame received by the transmission frame receiving unit 102 includes only the fourth control signaling SIG.
  • the preamble of the third transmission frame sent by the transmission frame sending unit 101 includes only the third control signaling SIG; the transmission frame The preamble of the fourth transmission frame received by the receiving unit 102 includes only the fourth control signaling SIG and the fourth short training domain STF.
  • the transmission frame sending unit 101 is further configured to:
  • transmission frame sent by the transmission frame sending unit 101 and the preamble of the transmission frame received by the transmission frame receiving unit 102 can also be combined by other forms, and only a few examples are described in the embodiments of the present invention. Other implementations derived from the manner are within the scope of the invention.
  • FIG. 11 is a schematic structural diagram of a communication device in another wireless local area network according to an embodiment of the present invention.
  • the first phase of the D2D transmission in the embodiment of the present invention is taken as an example of establishing the first interaction after the D2D transmission link.
  • the communication device 110 can include at least one processor 111, such as a CPU, at least one communication bus 112, a wireless signal transceiving device 113, and a memory 114.
  • Communication bus 113 is used to implement connection communication between these components.
  • the memory 114 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the wireless signal transceiver device 113 is configured to:
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include one or both of a short training domain STF and a long training domain LTF;
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • the preamble of the third transmission frame sent by the wireless signal transceiving device 113 includes only the third control signaling SIG, and the preamble of the received fourth transmission frame is included. Only the fourth control signaling SIG is included.
  • the wireless signal transceiver 113 can also be used to:
  • the preamble of the third transmission frame sent by the wireless signal transceiver 113 includes only the third control signaling SIG and the third short training domain STF
  • the wireless The preamble of the fourth transmission frame received by the signal transceiving device 113 includes only the fourth The control signaling SIG and the fourth short training domain STF.
  • FIG. 12 is a schematic structural diagram of a communication device in a wireless local area network according to an embodiment of the present invention.
  • the communication device provided by the embodiment of the present invention may include a mobile phone, a tablet computer, a notebook computer, or the like.
  • the communication device 120 shown in FIG. 120 may include at least a transmission frame transmitting unit 121 and a transmission frame receiving unit 122, where:
  • the transmission frame receiving unit 121 is configured to receive, at a beginning stage of the D2D transmission, a first transmission frame sent by the first non-access point station, where the preamble of the first transmission frame includes a first short training domain STF, and a first Long training domain LTF and first control signaling SIG.
  • the transmission frame sending unit 122 is configured to: when receiving the first transmission frame, return a second transmission frame to the first non-access point station, where the preamble of the second transmission frame includes a second short training The domain STF, the second long training domain LTF, and the second control signaling SIG.
  • the transmission frame receiving unit 121 is further configured to: at a subsequent stage of the D2D transmission, receive a third transmission frame sent by the first non-access point station, where the preamble of the third transmission frame includes at least a first
  • the third control signaling SIG does not include one or both of the short training domain STF and the long training domain LTF.
  • the transmission frame sending unit 122 is further configured to: when receiving the third transmission frame, return a fourth transmission frame to the first non-access point site, where the preamble of the fourth transmission frame includes at least The fourth control signaling SIG does not include one or both of the short training domain STF and the long training domain LTF.
  • the third transmission frame sent by STA1 starts as a subsequent stage of D2D transmission; if STA1 and STA2 have two interactions, The fifth transmission frame sent by STA1 starts with the subsequent stage of D2D transmission. If there are three interactions between STA1 and STA2, the seventh transmission frame sent by STA1 starts as the subsequent stage of D2D transmission, and so on.
  • the first stage of the D2D transmission in the embodiment of the present invention is an example of an interaction after the D2D transmission link is established.
  • the transmission frame receiving unit 121 receives
  • the preamble of the third transmission frame includes only the third control signaling SIG;
  • the preamble of the fourth transmission frame sent by the transmission frame sending unit 122 includes only the fourth control signaling SIG.
  • the transmission frame The receiving unit 121 is further configured to:
  • the preamble of the third transmission frame received by the transmission frame receiving unit 121 only includes that the third control signaling SIG cannot meet the transmission requirement, the preamble of the fourth transmission frame sent by the transmission frame sending unit 122 is included. a fourth control signaling SIG, and a fourth short training domain STF and/or a fourth long training domain LTF. Further, the frame receiving unit 121 receives the third transmission frame retransmitted by the first non-access point site.
  • the preamble of the third transmission frame includes the third control signaling SIG and the third short training domain STF; or
  • the transmission frame transmitting unit 122 does not transmit the fourth transmission frame, and further, the transmission frame Receiving, by the receiving unit 121, the third transmission frame that is retransmitted by the first non-access point station, where the preamble of the third transmission frame includes the third control signaling SIG and the third short training domain STF .
  • the preamble of the third transmission frame received by the transmission frame receiving unit 121 includes only the third control signaling SIG and the third short training domain STF;
  • the preamble of the fourth transmission frame sent by the sending unit 122 includes only the fourth control signaling SIG and the fourth short training domain STF.
  • the preamble of the third transmission frame received by the transmission frame receiving unit 121 includes only the third control signaling SIG and the third The short training field STF; the preamble of the fourth transmission frame sent by the transmission frame sending unit 122 includes only the fourth control signaling SIG.
  • the preamble of the third transmission frame received by the transmission frame receiving unit 121 includes only the third control signaling SIG; the transmission frame The preamble of the fourth transmission frame sent by the sending unit 122 includes only the fourth control signaling SIG. And the fourth short training domain STF.
  • the transmission frame receiving unit 121 is further configured to:
  • Receiving the third transmission frame sent by the first non-access point station again, and the preamble of the third transmission frame that is sent again includes the third control signaling SIG, and the third short training domain STF and / or the third long training domain LTF.
  • transmission frame received by the transmission frame receiving unit 121 and the preamble of the transmission frame sent by the transmission frame sending unit 122 can also be combined by other forms, and only a few examples are described in the embodiment of the present invention. Other implementations derived from the manner are within the scope of the invention.
  • FIG. 13 is a schematic structural diagram of a communication device in another wireless local area network according to an embodiment of the present invention.
  • the first phase of the D2D transmission in the embodiment of the present invention is taken as an example of establishing the first interaction after the D2D transmission link.
  • the communication device 130 can include at least one processor 131, such as a CPU, at least one communication bus 132, a wireless signal transceiver 133, and a memory 134.
  • Communication bus 133 is used to implement connection communication between these components.
  • the memory 134 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the wireless signal transceiver device 133 is configured to:
  • the preamble of the third transmission frame includes at least a third control signaling SIG, and does not include short training.
  • the preamble of the fourth transmission frame includes at least a fourth control signaling SIG, and does not include one or both of the short training domain STF and the long training domain LTF.
  • the preamble of the third transmission frame sent by the wireless signal transceiving device 133 includes only the third control signaling SIG, and the preamble of the received fourth transmission frame is included. Only the fourth control signaling SIG is included.
  • the wireless signal transceiver 133 is also used to:
  • the preamble of the third transmission frame received by the wireless signal transceiver 133 includes only the third control signaling SIG and the third short training domain STF.
  • the preamble of the fourth transmission frame sent by the radio signal transceiver 133 includes only the fourth control signaling SIG and the fourth short training domain STF.
  • FIG. 14 is a schematic structural diagram of a communication system in a wireless local area network according to an embodiment of the present invention.
  • the communication system in the WLAN provided by the embodiment of the present invention includes a communication device and a communication device.
  • the communication device and the communication device refer to the corresponding embodiments in FIG. 10 to FIG. 13 , and details are not described herein again.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the methods described in connection with FIG. 2, FIG. 7 or FIG. 8 in the embodiment of the present invention. A step of.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the methods described in connection with FIG. 2, FIG. 7 or FIG. 8 in the embodiment of the present invention. A step of.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明实施例公开了一种无线局域网中的通信方法、通信设备和通信系统，其中一种通信方法包括：在D2D传输的开始阶段，向STA2发送第一传输帧，以及，接收STA2返回的第二传输帧；在D2D传输的后续阶段，向STA2发送第三传输帧，以及，接收STA2返回的第四传输帧，第三传输帧的前导码中至少包含第三SIG，且不包含STF和LTF两者之一或全部，第四传输帧的前导码中至少包含第四SIG，且不包含STF和LTF两者之一或全部。实施本发明实施例，可以降低D2D传输的后续阶段的物理层开销，进而，提高D2D传输的吞吐量。

Description

一种无线局域网中的通信方法、通信设备和通信系统 技术领域
本发明涉及无线通信技术领域，尤其涉及一种无线局域网中的通信方法、通信设备和通信系统。
背景技术
前导码是传输帧起始处的一组或多组bit组，一般包括短训练域STF、长训练域LTF和控制信令SIG，其中，短训练域STF用于增益控制、时间同步和频率同步；长训练域LTF用于信道估计；控制信令SIG用于指示编码调制方式、传输时长等，因此，接收方可以根据传输帧的前导码进行一系列的控制，进而获取该传输帧的传输信息。
D2D(device to device，设备到设备)传输是指在无线通信网络中，实现两个通信设备间的直接通信连接。针对现有Wi-Fi(wireless fidelity，无线保真)系统，D2D(device to device，端到端)传输的开始阶段和后续阶段，其传输帧的前导码均采用相同的前导码格式，如图1所示的802.11N标准所规定的物理层前导码格式，但是，在D2D传输的后续阶段，前导码中的某些训练域是非必要的，例如，D2D传输时，两个站点间的信道基本上不会改变，因此，用于信道估计的长训练域LTF则非必要，如果在D2D传输的整个阶段都采用相同的前导码格式，则带来了不必要的物理层开销，降低了D2D传输的吞吐量。
发明内容
本发明实施例提供了一种无线局域网中的通信方法、通信设备和通信系统，可以降低D2D传输后续阶段的物理层开销，提高D2D传输的吞吐量。
本发明实施例第一方面提供了一种无线局域网中的通信设备，所述通信设备为第一非接入点站点，所述通信设备包括：
传输帧发送单元，用于在D2D传输的开始阶段，向第二非接入点站点发送第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训 练域LTF和第一控制信令SIG；
传输帧接收单元，用于接收所述第二非接入点站点在接收到所述第一传输帧时返回的第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
所述传输帧发送单元还用于，在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述传输帧接收单元还用于，接收所述第二非接入点站点在接收到所述第三传输帧时返回的第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
在第一方面的第一种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
结合第一方面的第一种可能实现方式，在第二种可能的实现方式中，在所述D2D传输的后续阶段，如果所述传输帧发送单元发送的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧发送单元还用于：
重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
在第一方面的第三种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
本发明实施例第二方面还提供一种无线局域网中的通信设备，所述通信设备为第二非接入点站点，所述通信设备包括：
传输帧接收单元，用于在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG；
传输帧发送单元，用于在接收到所述第一传输帧时，向所述第一非接入点 站点返回第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
所述传输帧接收单元还用于，在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述传输帧发送单元还用于，在接收到所述第三传输帧时，向所述第一非接入点站点返回第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
在第二方面的第一种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
结合第二方面的第一种可能实现方式，在第二种可能的实现方式中，在所述D2D传输的后续阶段，如果所述传输帧接收单元接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧接收单元还用于：
接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
在第二方面的第三种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
本发明实施例第三方面还提供一种无线局域网中的通信方法，包括：
在D2D传输的开始阶段，第一非接入点站点向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，所述第一非接入点站点向所述第二非接入 点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
在第三方面的第一种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
结合第三方面的第一种可能实现方式，在第二种可能的实现方式中，在所述D2D传输的后续阶段，如果所述第一非接入点站点发送的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述方法还包括：
所述第一非接入点站点重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
在第三方面的第三种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
本发明实施例第四方面还提供一种无线局域网中的通信方法，包括：
在D2D传输的开始阶段，第二非接入点站点接收第一非接入点站点发送的第一传输帧，以及，向所述第一非接入点站点返回第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，所述第二非接入点站点接收所述第一非接入点站点发送的第三传输帧，以及，向所述第一非接入点站点返回第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练 域STF和长训练域LTF两者之一或者全部。
在第四方面的第一种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
结合第四方面的第一种可能实现方式，在第二种可能的实现方式中，在所述D2D传输的后续阶段，如果所述第二非接入点站点接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述方法还包括：
所述第二非接入点站点接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
在第四方面的第三种可能的实现方式中，在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
本发明实施例第五方面还提供了一种无线局域网中的通信设备，所述无线局域网中的通信设备包括无线信号收发装置、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
在D2D传输的开始阶段，向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
本发明实施例第六方面还提供了一种无线局域网中的通信设备，所述无线局域网中的通信设备包括无线信号收发装置、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，以及，向所述第一非接入点站点返回第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，以及，向所述第一非接入点站点返回第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
本发明实施例第七方面还提供一种计算机存储介质，所述计算机存储介质存储有程序，该程序执行时包括第三方面提供的无线局域网中的通信方法的部分或全部步骤。
本发明实施例第八方面还提供一种计算机存储介质，所述计算机存储介质存储有程序，该程序执行时包括第四方面提供的无线局域网中的通信方法的部分或全部步骤。
本发明实施例第九方面还提供一种无线局域网中的通信系统，所述通信系统包括通信设备和通信设备，其中，
所述通信设备如第一方面，或者第一方面的第一种可能的实现方式，或者第一方面的第二种可能的实现方式，或者第一方面的第三种可能的实现方式中的通信设备；
所述通信设备如第二方面，或者第二方面的第一种可能的实现方式，或者第二方面的第二种可能的实现方式，或者第二方面的第三种可能的实现方式中的通信设备。
实施本发明实施例，具有如下有益效果：第一非接入点站点和第二非接入点站点在D2D传输的开始阶段，发送的传输帧的前导码都包含短训练域STF、长训练域LTF和控制信令SIG，在D2D传输的后续阶段，发送的传输帧的前导码包含控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部，降低了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量。
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是现有技术802.11N标准所规定的物理层前导码格式的结构示意图；
图2是本发明实施例提供的一种无线局域网中的通信方法的流程示意图；
图3是本发明实施例提供的一种D2D传输中前导码的流程示意图；
图4是本发明实施例提供的另一种D2D传输中前导码的流程图；
图5是本发明实施例提供的又一种D2D传输中前导码的流程图；
图6是本发明实施例提供的又一种D2D传输中前导码的流程图；
图7是本发明实施例提供的另一种无线局域网中的通信方法的流程图；
图8是本发明实施例提供的又一种无线局域网中的通信方法的流程图；
图9是本发明实施例提供的又一种D2D传输中前导码的流程图；
图10是本发明提供的一种无线局域网中的通信设备的结构示意图；
图11是本发明提供的另一种无线局域网中的通信设备的结构示意图；
图12是本发明提供的一种无线局域网中的通信设备的结构示意图；
图13是本发明提供的另一种无线局域网中的通信设备的结构示意图；
图14是本发明提供的一种无线局域网中的通信系统的结构示意图。
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。
请参见图2，图2是本发明实施例提供的一种无线局域网中的通信方法的流程示意图。本发明实施例主要是从第一非接入点站点侧描述的。如图2所示的无线局域网中的通信流程至少可以包括：
S201，在D2D传输的开始阶段，第一非接入点站点向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG。
短训练域STF用于增益控制、时间频率同步控制；长训练域LTF用于信道估计；控制信令SIG用于指示编码调制方式、传输时长等；需要指出的是，本发明实施例中，第一短训练域STF和第二短训练域STF可以相同或者不相同；第一长训练域LTF和第二长训练域LTF可以相同或者不相同；第一控制信令SIG和第二控制信令SIG可以相同或者不相同，本发明不做限定。
第一非接入点站点(以下简称为STA1)为D2D传输的发起方，第二非接入点站点(以下简称为STA2)为D2D传输的接收方。
优选地，D2D传输的开始阶段可以是STA1和STA2建立D2D传输链接后的第一个交互，例如，STA1发送RTS(request to send，请求发送)帧，STA2返回CTS(clear to send，允许发送)帧，再如，STA1发送数据帧，STA2返回ACK帧；
可选地，D2D传输的开始阶段也可以是STA1和STA2建立D2D传输链接后的第一个交互直到第N(N≥2)个交互，需要说明的是，若STA1和STA2建立D2D传输链接后有M个交互，N<M。为了便于理解，本发明实施例中D2D传输的开始阶段以建立D2D传输链接后的第一个交互为例，其中，D2D传输的开始阶段以建立D2D传输链接后的第一个交互直到第N(N≥2)个交互的情况，请参阅图8所示的具体实施例。
具体实现中，STA1向STA2发送第一传输帧，所述第一传输帧的前导码 中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，以使STA2根据第一传输帧的前导码记录增益控制信息、时间频率同步信息和STA1到STA2的信道信息；STA1接收STA2发送的第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG，STA1也可以根据第二传输帧的前导码记录增益控制信息、时间频率同步信息和STA2到STA1的信道信息。
S202，在所述D2D传输的后续阶段，所述第一非接入点站点向所述第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
如图3所示的本发明实施例提供的一种前导码的流程示意图，其中，虚线左侧为D2D传输的开始阶段，虚线右侧为D2D传输的后续阶段。为了便于理解，在D2D传输的后续阶段只针对第三传输帧以及第四传输帧进行描述，其他传输帧以此类推，不能以此限定本发明。
优选地，在D2D传输的后续阶段，STA1向STA2发送的第三传输帧只包含第三控制信令SIG，不包含短训练域STF和长训练域LTF，STA1接收STA2发送的第四传输帧也只包含第四控制信令SIG，不包含短训练域STF和长训练域LTF，如图3所示。
由于，在D2D传输的开始阶段，STA1记录了增益控制信息、时间频率同步信息和STA2到STA1的信道信息，STA2也记录了增益控制信息、时间频率同步信息和STA1到STA2的信道信息，因此，在D2D传输的后续阶段，STA1和STA2都可以根据各自记录的增益控制信息、时间频率同步信息和信道信息，进行增益控制和时间频率同步控制，再根据信道信息提取传输帧中的数据信息。D2D传输的后续阶段，STA1与STA2相互通信发送的传输帧的前导码只包含控制信令SIG，不包含短训练域STF和长训练域LTF，相对现有技术，D2D传输的整个阶段的前导码都包含短训练域STF和长训练域LTF而言，减少了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量。
进一步地，在D2D传输的后续阶段，如果STA1发送的第三传输帧的前导码只包含第三控制信令SIG无法满足传输需求，STA1还可以重新发送所述第三传输帧，再次发送的所述第三传输帧的前导码包含第三控制信令SIG以及，第三短训练域STF和/或第三长训练域LTF。
STA1在发送只包含第三控制信令SIG前导码的第三传输帧之后，如果接收到的第四传输帧的前导码除了包含第四控制信令SIG以外，还包含短训练域STF和/或长训练域LTF，STA1可以判定STA2不能获取到第三传输帧中的数据，即判定第三传输帧的前导码只包含第三控制信令SIG无法满足传输需求，STA1则再一次发送第三传输帧，再次发送的所述第三传输帧的前导码包含第三控制信令SIG，以及第三短训练域STF和/或第三长训练域LTF。如图4所示的本发明实施例提供的另一种前导码的流程示意图，其中，携带data1的传输帧为第三传输帧。
STA1在发送只包含第三控制信令SIG前导码的第三传输帧之后，如果STA1在预设时间阈值内没有收到STA2发送的第四传输帧，即STA1等待STA2发送第四传输帧的等待时间t大于所述预设时间阈值，STA1则判定STA2不能获取到第三传输帧中的数据，即判定第三传输帧的前导码只包含第三控制信令SIG无法满足传输需求，STA1则再一次发送第三传输帧，再次发送的所述第三传输帧的前导码包含第三控制信令SIG，以及第三短训练域STF和/或第三长训练域LTF。如图5所示的本发明实施例提供的又一种前导码的流程示意图，其中，携带data1的传输帧为第三传输帧。
可理解的是，在D2D传输的后续阶段，STA1发送的所有只包含控制信令SIG前导码的传输帧，如果存在不满足传输要求的，STA1都需要再次发送对应的传输帧，本发明实施例具体只针对第三传输帧进行描述，不能以此限定本发明。
可选地，在D2D传输的后续阶段，STA1向STA2发送的第三传输帧的前导码中只包含第三控制信令SIG和第三短训练域STF，STA1接收的STA2发送的第四传输帧的前导码中也只包含第四控制信令SIG和第四短训练域STF。
由于，在D2D传输的开始阶段，STA1记录了STA2到STA1的信道信息，STA2也记录了STA1到STA2的信道信息，则在D2D传输的后续阶段，STA1 和STA2都可以根据各自记录的信道信息提取出传输帧中的数据信息，则该D2D传输的后续阶段，STA1与STA2相互通信发送的传输帧的前导码可以只包含短训练域STF和控制信令SIG，不包含长训练域LTF，相对现有技术，D2D传输的整个阶段的前导码都包含长训练域LTF而言，减少了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量，如图6所示的本发明实施例提供的又一种前导码的流程示意图。
D2D传输的后续阶段，在其他可选实施例中，STA1和STA2发送的传输帧的前导码还可以通过其他形式进行组合，例如，第三传输帧的前导码中只包含第三短训练域STF和第三控制信令SIG，第四传输帧的前导码只包括第四控制信令SIG；再如，第三传输帧的前导码中只包含第三控制信令SIG，第四传输帧的前导码只包含第四短训练域STF和第四控制信令SIG等等，通过以上方式引申出来的其他实现方式，均在本发明的发明范围内。
在图2所示的实施例中，STA1和STA2在D2D传输的开始阶段，发送的传输帧的前导码都包含短训练域STF、长训练域LTF和控制信令SIG，在D2D传输的后续阶段，发送的传输帧的前导码包含控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部，与现有技术中，D2D传输的整个阶段前导码都包含短训练域STF和长训练域而言，降低了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量。
请参见图7，图7是本发明实施例提供的另一种无线局域网中的通信方法的流程示意图。本发明实施例主要是从通信系统角度进行描述的。如图2所示的无线局域网中的通信流程至少可以包括：
S701，在D2D传输的开始阶段，STA1向STA2发送第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG。
为了便于理解，本发明实施例中的开始阶段以建立D2D传输链接后的第一个交互为例。
STA2接收第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，STA2可以根据第一传输帧的 前导码记录增益控制信息、时间频率同步信息和STA1到STA2的信道信息。
S702，STA2向STA1返回第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG。
STA1接收第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG，STA1可以根据第二传输帧的前导码记录增益控制信息、时间频率同步信息和STA2到STA1的信道信息。
S703，在D2D传输的后续阶段，STA1向STA2发送第三传输帧，所述第三传输帧的前导码中只包含第三控制信令SIG。
S704，STA2向STA1返回第四传输帧，所述第四传输帧的前导码中只包含第四控制信令SIG。
在D2D传输的开始阶段，STA2记录了增益控制信息、时间频率同步信息和STA1到STA2的信道信息，如果STA2根据记录的增益控制信息、时间频率同步信息和STA1到STA2的信道信息可以获取到第三传输帧的数据信息，STA2向STA1返回的第四传输帧的前导码中只包含第四控制信令SIG。
S705，STA1向STA2发送第五传输帧，所述第五传输帧的前导码中只包含第五控制信令SIG。
STA1接收到STA2发送的第四传输帧，检测到该第四传输帧中只包含第四控制信令SIG，STA1向STA2发送的第五传输帧的前导码中可以只包含第五控制信息SIG。
S706，STA2无法获取第五传输帧中的数据信息，STA2向STA1返回第六传输帧，所述第六传输帧的前导码中包含第六控制信息令，以及第六短训练域STF和/或第六长训练域LTF。
在D2D传输的开始阶段，STA2记录了增益控制信息、时间频率同步信息和STA1到STA2的信道信息，如果STA2根据记录的增益控制信息、时间频率同步信息和STA1到STA2的信道信息无法获取到第五传输帧的数据信息，STA2向STA1返回的第六传输帧的前导码中包含第六控制信息令，以及第六短训练域STF和/或第六长训练域LTF。
S707，STA1向STA2再次发送第五传输帧，再次发送的所述第五传输帧的前导码包含第五控制信令SIG，以及第五短训练域STF和/或第五长训练域 LTF。
STA1接收到STA2发送的第六传输帧，检测到该第六传输帧中除了包含第六控制信令SIG外，还包含第六短训练域STF和/或第六长训练域LTF时，STA1可以判定发送的只包含第五控制信令SIG的前导码的第五传输帧不满足传输需求，STA1则再次发送第五传输帧，所述第五传输帧的前导码中包含第五控制信令SIG和第五短训练域STF。
S708，STA2向STA1返回第七传输帧，所述第七传输帧的前导码只包含第七控制信令SIG。
STA2接收到STA1再次发送的第五传输帧时，可以根据第五传输帧的前导码包含的第五控制信令SIG，以及第五短训练域STF和/或第五长训练域LTF获取第五传输帧中的数据信息，STA2向STA1返回的第七传输帧的前导码中只包含第七控制信令SIG。为了便于理解，假设本发明实施例中的第五传输帧是该D2D传输的最后一个传输帧，因此，STA1在接收到该第七传输帧时，就结束该D2D传输。
在图7所示的实施例中，STA1和STA2在D2D传输的开始阶段，发送的传输帧的前导码都包含短训练域STF、长训练域LTF和控制信令SIG，在D2D传输的后续阶段，发送的传输帧的前导码包含控制信令SIG，且不包含短训练域STF和长训练域LTF，与现有技术中，D2D传输的整个阶段前导码都包含短训练域STF和长训练域而言，降低了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量。
请参阅图8，图8是本发明实施例提供的又一种无线局域网中的通信方法的流程示意图。本发明实施例中，D2D传输的开始阶段是STA1和STA2建立D2D传输链接后的第一个交互直到第N(N≥2)个交互，若STA1和STA2建立D2D传输链接后有M个交互，N<M。为了便于理解，本发明实施例中D2D传输的开始阶段以建立D2D传输链接后的第一个交互和第二个交互为例。如图8所示的无线局域网中的通信流程至少可以包括：
S801，在D2D传输的开始阶段，第一非接入点站点向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述 第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG。
具体实现中，STA1向STA2发送第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，以使STA2根据第一传输帧的前导码记录增益控制信息、时间频率同步信息和STA1到STA2的信道信息；STA1接收STA2发送的第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG，STA1也可以根据第二传输帧的前导码记录增益控制信息、时间频率同步信息和STA2到STA1的信道信息。
需要指出的是，本发明实施例中，第一短训练域STF和第二短训练域STF可以相同或者不相同；第一长训练域LTF和第二长训练域LTF可以相同或者不相同；第一控制信令SIG和第二控制信令SIG可以相同或者不相同，本发明不做限定。
S802，第一非接入点站点向第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧，所述第三传输帧的前导码中包含第三短训练域STF、第三长训练域LTF和第三控制信令SIG，所述第四传输帧的前导码中包含第四短训练域STF、第四长训练域LTF和第四控制信令SIG。
具体实现中，STA1向STA2发送第三传输帧，所述第三传输帧的前导码中包含第三短训练域STF、第三长训练域LTF和第三控制信令SIG，STA2可以根据第三传输帧的前导码更新记录的增益控制信息、时间频率同步信息和STA1到STA2的信道信息；STA1接收STA2发送的第四传输帧，所述第四传输帧的前导码中包含第四短训练域STF、第四长训练域LTF和第四控制信令SIG，STA1可以根据第四传输帧的前导码更新记录的增益控制信息、时间频率同步信息和STA2到STA1的信道信息。
需要指出的是，本发明实施例中，第三短训练域STF和第四短训练域STF可以相同或者不相同；第三长训练域LTF和第四长训练域LTF可以相同或者不相同；第三控制信令SIG和第四控制信令SIG可以相同或者不相同，本发明不做限定。
S803，在所述D2D传输的后续阶段，所述第一非接入点站点向所述第二非接入点站点发送第五传输帧，以及，接收所述第二非接入点站点返回的第六传输帧，所述第五传输帧的前导码中至少包含第五控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部，所述第六传输帧的前导码中至少包含第六控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
需要指出的是，在D2D传输的开始阶段，如果，STA1和STA2存在一次交互，则以STA1发送的第三传输帧开始为D2D传输的后续阶段；如果，STA1和STA2存在两次交互，则以STA1发送的第五传输帧开始为D2D传输的后续阶段，如果，STA1和STA2存在三次交互，则以STA1发送的第七传输帧开始为D2D传输的后续阶段，以此类推。
如图9所示的本发明实施例提供的又一种前导码的流程示意图，其中，虚线左侧为D2D传输的开始阶段，虚线右侧为D2D传输的后续阶段。为了便于理解，在D2D传输的后续阶段只针对第五传输帧以及第六传输帧进行描述，其他传输帧以此类推，不能以此限定本发明。
优选地，在D2D传输的后续阶段，STA1向STA2发送的第五传输帧只包含第五控制信令SIG，不包含短训练域STF和长训练域LTF，STA1接收STA2发送的第六传输帧也只包含第六控制信令SIG，不包含短训练域STF和长训练域LTF，如图9所示。
进一步地，在D2D传输的后续阶段，如果STA1发送的第五传输帧的前导码只包含第五控制信令SIG无法满足传输需求，STA1还可以重新发送所述第五传输帧，再次发送的所述第五传输帧的前导码包含第五控制信令SIG，以及第五短训练域STF和/或第五长训练域LTF。
可选地，在D2D传输的后续阶段，STA1向STA2发送的第五传输帧的前导码中只包含第五控制信令SIG和第五短训练域STF，STA1接收的STA2发送的第六传输帧的前导码中也只包含第六控制信令SIG和第六短训练域STF。
在图8所示的实施例中，STA1和STA2在D2D传输的开始阶段，发送的传输帧的前导码都包含短训练域STF、长训练域LTF和控制信令SIG，在D2D传输的后续阶段，发送的传输帧的前导码包含控制信令SIG，且不包含短训练 域STF和长训练域LTF两者之一或者全部，与现有技术中，D2D传输的整个阶段前导码都包含短训练域STF和长训练域而言，降低了D2D传输的后续阶段的物理层开销，提高了D2D传输的吞吐量。
请参参阅图10，图10是本发明实施例提供的一种无线局域网中的通信设备的结构示意图。本发明实施例提供的通信设备可以包括手机、平板电脑或笔记本电脑等等。如图10所示的通信设备100至少可以包括传输帧发送单元101和传输帧接收单元102，其中：
传输帧发送单元101，用于在D2D传输的开始阶段，向第二非接入点站点(Non-AP STA)发送第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG。
传输帧接收单元102，用于接收所述第二非接入点站点在接收到所述第一传输帧时返回的第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG。
所述传输帧发送单元101还用于，在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
所述传输帧接收单元102还用于，接收所述第二非接入点站点在接收到所述第三传输帧时返回的第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
需要指出的是，在D2D传输的开始阶段，如果，STA1和STA2存在一次交互，则以传输帧发送单元101发送的第三传输帧开始为D2D传输的后续阶段；如果，STA1和STA2存在两次交互，则以传输帧发送单元101发送的第五传输帧开始为D2D传输的后续阶段，如果，STA1和STA2存在三次交互，则以传输帧发送单元101发送的第七传输帧开始为D2D传输的后续阶段，以此类推。为例便于理解，本发明实施例D2D传输的开始阶段以建立D2D传输链接后的第一个交互为例。
优选地，在所述D2D传输的后续阶段，所述传输帧发送单元101发送的第三传输帧的前导码中只包括所述第三控制信令SIG；所述传输帧接收单元 102接收的第四传输帧的前导码中只包含所述第四控制信令SIG。
进一步地，如果传输帧发送单元101发送的第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧发送单元102还用于：
重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
可选地，在所述D2D传输的后续阶段，所述传输帧发送单元101发送的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF；所述传输帧接收单元102接收的第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
另一种可选地实现方式，在所述D2D传输的后续阶段，所述传输帧发送单元101发送的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF；所述传输帧接收单元102接收的第四传输帧的前导码中只包含所述第四控制信令SIG。
另一种可选地实现方式，在所述D2D传输的后续阶段，所述传输帧发送单元101发送的第三传输帧的前导码中只包括所述第三控制信令SIG；所述传输帧接收单元102接收的第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
进一步地，如果传输帧发送单元101发送的第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧发送单元101还用于：
重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
需要指出的是，传输帧发送单元101发送的传输帧和传输帧接收单元102接收的传输帧的前导码还可以通过其他形式进行组合，本发明实施例只例举了几个进行说明，通过以上方式引申出来的其他实现方式，均在本发明的发明范围内。
可理解的是，本实施例的通信设备100的各功能模块的功能可根据上述方法实施例中的方法具体实现，可以具体对应参考图2、图7或图8方法实施例的相关描述，此处不再赘述。
请参阅图11，图11是本发明实施例提供的另一种无线局域网中的通信设备的结构示意图。为例便于理解，本发明实施例D2D传输的开始阶段以建立D2D传输链接后的第一个交互为例。如图11所示，该通信设备110可以包括：至少一个处理器111，例如CPU，至少一个通信总线112，无线信号收发装置113以及存储器114。通信总线113用于实现这些组件之间的连接通信。存储器114可以是高速RAM存储器，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器。其中，无线信号收发装置113用于：
在D2D传输的开始阶段，向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
优选地，在所述D2D传输的后续阶段，无线信号收发装置113所发送的第三传输帧的前导码中只包含所述第三控制信令SIG，所接收的第四传输帧的前导码中只包含所述第四控制信令SIG。
进一步地，在所述D2D传输的后续阶段，如果无线信号收发装置113发送的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述无线信号收发装置113还可以用于：
重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
可选地，在所述D2D传输的后续阶段，无线信号收发装置113所发送的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，无线信号收发装置113所接收的第四传输帧的前导码中只包含所述第四 控制信令SIG和所述第四短训练域STF。
可理解的是，本实施例的通信设备110的各功能模块的功能可根据上述方法实施例中的方法具体实现，可以具体对应参考图2、图7或图8方法实施例的相关描述，此处不再赘述。
请参参阅图12，图12是本发明实施例提供的一种无线局域网中的通信设备的结构示意图。本发明实施例提供的通信设备可以包括手机、平板电脑或笔记本电脑等等。如图120所示的通信设备120至少可以包括传输帧发送单元121和传输帧接收单元122，其中：
传输帧接收单元121，用于在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG。
传输帧发送单元122，用于在接收到所述第一传输帧时，向所述第一非接入点站点返回第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG。
所述传输帧接收单元121还用于，在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
所述传输帧发送单元122还用于，在接收到所述第三传输帧时，向所述第一非接入点站点返回第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
需要指出的是，在D2D传输的开始阶段，如果，STA1和STA2存在一次交互，则以STA1发送的第三传输帧开始为D2D传输的后续阶段；如果，STA1和STA2存在两次交互，则以STA1发送的第五传输帧开始为D2D传输的后续阶段，如果，STA1和STA2存在三次交互，则以STA1发送的第七传输帧开始为D2D传输的后续阶段，以此类推。为例便于理解，本发明实施例D2D传输的开始阶段以第建立D2D传输链接后的一个交互为例。
优选地，在所述D2D传输的后续阶段，所述传输帧接收单元121接收的 第三传输帧的前导码中只包括所述第三控制信令SIG；所述传输帧发送单元122发送的第四传输帧的前导码中只包含所述第四控制信令SIG。
进一步地，在所述D2D传输的后续阶段，如果所述传输帧接收单元121接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧接收单元121还用于：
接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
如果所述传输帧接收单元121接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，传输帧发送单元122发送的第四传输帧的前导码中包括第四控制信令SIG，以及第四短训练域STF和/或第四长训练域LTF，进而，输帧接收单元121接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF；或者，
如果所述传输帧接收单元121接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，传输帧发送单元122不发送第四传输帧，进而，输帧接收单元121接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
可选地，在所述D2D传输的后续阶段，传输帧接收单元121接收的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF；传输帧发送单元122发送的第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
另一种可选地实现方式，在所述D2D传输的后续阶段，所述传输帧接收单元121接收的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF；所述传输帧发送单元122发送的第四传输帧的前导码中只包含所述第四控制信令SIG。
另一种可选地实现方式，在所述D2D传输的后续阶段，所述传输帧接收单元121接收的第三传输帧的前导码中只包括所述第三控制信令SIG；所述传输帧发送单元122发送的第四传输帧的前导码中只包含所述第四控制信令SIG 和所述第四短训练域STF。
进一步地，如果传输帧接收单元121接收的第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧接收单元121还用于：
再次接收第一非接入点站点发送的所述第三传输帧，再次发送的所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或第三长训练域LTF。
需要指出的是，传输帧接收单元121接收的传输帧和传输帧发送单元122发送的传输帧的前导码还可以通过其他形式进行组合，本发明实施例只例举了几个进行说明，通过以上方式引申出来的其他实现方式，均在本发明的发明范围内。
可理解的是，本实施例的通信设备120的各功能模块的功能可根据上述方法实施例中的方法具体实现，可以具体对应参考图2、图7或图8方法实施例的相关描述，此处不再赘述。
请参阅图13，图13是本发明实施例提供的另一种无线局域网中的通信设备的结构示意图。为例便于理解，本发明实施例D2D传输的开始阶段以建立D2D传输链接后的第一个交互为例。如图13所示，该通信设备130可以包括：至少一个处理器131，例如CPU，至少一个通信总线132，无线信号收发装置133以及存储器134。通信总线133用于实现这些组件之间的连接通信。存储器134可以是高速RAM存储器，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器。其中，无线信号收发装置133用于：
在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，以及，向所述第一非接入点站点返回第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，以及，向所述第一非接入点站点返回第四传输帧；
所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练 域STF和长训练域LTF两者之一或者全部；
所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
优选地，在所述D2D传输的后续阶段，无线信号收发装置133所发送的第三传输帧的前导码中只包含所述第三控制信令SIG，所接收的第四传输帧的前导码中只包含所述第四控制信令SIG。
进一步地，在所述D2D传输的后续阶段，如果无线信号收发装置133接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述无线信号收发装置133还用于：
接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG和所述第三短训练域STF。
可选地，在所述D2D传输的后续阶段，所述无线信号收发装置133所接收的第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述无线信号收发装置133所发送的第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
可理解的是，本实施例的通信设备130的各功能模块的功能可根据上述方法实施例中的方法具体实现，可以具体对应参考图2、图7或图8方法实施例的相关描述，此处不再赘述。
请参阅图14，图14是本发明实施例提供的一种无线局域网中的通信系统的结构示意图。本发明实施例提供的无线局域网中的通信系统包括通信设备和通信设备，其中，所述通信设备以及通信设备请参阅图10至图13对应的实施例，在此不再赘述。
本发明实施例还提出了一种计算机存储介质，所述计算机存储介质存储有程序，所述程序执行时包括本发明实施例结合图2、图7或图8所描述的方法中的部分或全部的步骤。
本发明实施例还提出了一种计算机存储介质，所述计算机存储介质存储有程序，所述程序执行时包括本发明实施例结合图2、图7或图8所描述的方法中的部分或全部的步骤。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (21)

  1. 一种无线局域网中的通信设备，其特征在于，所述通信设备为第一非接入点站点，所述通信设备包括：
    传输帧发送单元，用于在D2D传输的开始阶段，向第二非接入点站点(Non-AP STA)发送第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG；
    传输帧接收单元，用于接收所述第二非接入点站点在接收到所述第一传输帧时返回的第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    所述传输帧发送单元还用于，在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述传输帧接收单元还用于，接收所述第二非接入点站点在接收到所述第三传输帧时返回的第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  2. 如权利要求1所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
  3. 如权利要求2所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，如果所述传输帧发送单元发送的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧发送单元还用于：
    重新发送所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
  4. 如权利要求1所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
  5. 一种无线局域网中的通信设备，其特征在于，所述通信设备为第二非接入点站点，所述通信设备包括：
    传输帧接收单元，用于在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG；
    传输帧发送单元，用于在接收到所述第一传输帧时，向所述第一非接入点站点返回第二传输帧，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    所述传输帧接收单元还用于，在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述传输帧发送单元还用于，在接收到所述第三传输帧时，向所述第一非接入点站点返回第四传输帧，所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  6. 如权利要求5所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
  7. 如权利要求6所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，如果所述传输帧接收单元接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述传输帧接收单元还用于：
    接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述 第三长训练域LTF。
  8. 如权利要求5所述的通信设备，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
  9. 一种无线局域网中的通信方法，其特征在于，包括：
    在D2D传输的开始阶段，第一非接入点站点向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    在所述D2D传输的后续阶段，所述第一非接入点站点向所述第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧；
    所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  10. 如权利要求9所述的方法，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
  11. 如权利要求10所述的方法，其特征在于，
    在所述D2D传输的后续阶段，如果所述第一非接入点站点发送的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述方法还包括：
    所述第一非接入点站点重新发送所述第三传输帧，所述第三传输帧的前导 码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
  12. 如权利要求9所述的方法，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
  13. 一种无线局域网中的通信方法，其特征在于，包括：
    在D2D传输的开始阶段，第二非接入点站点接收第一非接入点站点发送的第一传输帧，以及，向所述第一非接入点站点返回第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    在所述D2D传输的后续阶段，所述第二非接入点站点接收所述第一非接入点站点发送的第三传输帧，以及，向所述第一非接入点站点返回第四传输帧；
    所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  14. 如权利要求13所述的方法，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG，所述第四传输帧的前导码中只包含所述第四控制信令SIG。
  15. 如权利要求14所述的方法，其特征在于，
    在所述D2D传输的后续阶段，如果所述第二非接入点站点接收的所述第三传输帧的前导码只包含所述第三控制信令SIG无法满足传输需求，所述方法还包括：
    所述第二非接入点站点接收所述第一非接入点站点重新发送的所述第三传输帧，所述第三传输帧的前导码包含所述第三控制信令SIG，以及所述第三短训练域STF和/或所述第三长训练域LTF。
  16. 如权利要求13所述的方法，其特征在于，
    在所述D2D传输的后续阶段，所述第三传输帧的前导码中只包含所述第三控制信令SIG和所述第三短训练域STF，所述第四传输帧的前导码中只包含所述第四控制信令SIG和所述第四短训练域STF。
  17. 一种无线局域网中的通信设备，其特征在于，所述无线局域网中的通信设备包括无线信号收发装置、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
    在D2D传输的开始阶段，向第二非接入点站点发送第一传输帧，以及，接收所述第二非接入点站点返回的第二传输帧，所述第一传输帧的前导码中包含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    在所述D2D传输的后续阶段，向所述第二非接入点站点发送第三传输帧，以及，接收所述第二非接入点站点返回的第四传输帧；
    所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  18. 一种无线局域网中的通信设备，其特征在于，所述无线局域网中的通信设备包括无线信号收发装置、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
    在D2D传输的开始阶段，接收第一非接入点站点发送的第一传输帧，以及，向所述第一非接入点站点返回第二传输帧，所述第一传输帧的前导码中包 含第一短训练域STF、第一长训练域LTF和第一控制信令SIG，所述第二传输帧的前导码中包含第二短训练域STF、第二长训练域LTF和第二控制信令SIG；
    在所述D2D传输的后续阶段，接收所述第一非接入点站点发送的第三传输帧，以及，向所述第一非接入点站点返回第四传输帧；
    所述第三传输帧的前导码中至少包含第三控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部；
    所述第四传输帧的前导码中至少包含第四控制信令SIG，且不包含短训练域STF和长训练域LTF两者之一或者全部。
  19. 一种计算机存储介质，其特征在于，所述计算机存储介质存储有程序，所述程序执行时包括权利要求9～12任一项所述的步骤。
  20. 一种计算机存储介质，其特征在于，所述计算机存储介质存储有程序，所述程序执行时包括权利要求13～16任一项所述的步骤。
  21. 一种无线局域网中的通信系统，其特征在于，所述通信系统包括第一通信设备和第二通信设备，其中，
    所述第一通信设备为如权利要求1～4任一项所述的通信设备；
    所述第二通信设备为如权利要求5～8任一项所述的通信设备。
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CN102396186A (zh) * 2009-04-13 2012-03-28 马维尔国际贸易有限公司 用于wlan的物理层帧格式
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CN103053123A (zh) * 2010-08-10 2013-04-17 马维尔国际贸易有限公司 通信系统中的信道描述反馈
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CN102396186A (zh) * 2009-04-13 2012-03-28 马维尔国际贸易有限公司 用于wlan的物理层帧格式
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