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WO2017215350A1 - 一种退避方法和装置 - Google Patents

一种退避方法和装置 Download PDF

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Publication number
WO2017215350A1
WO2017215350A1 PCT/CN2017/081551 CN2017081551W WO2017215350A1 WO 2017215350 A1 WO2017215350 A1 WO 2017215350A1 CN 2017081551 W CN2017081551 W CN 2017081551W WO 2017215350 A1 WO2017215350 A1 WO 2017215350A1
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WIPO (PCT)
Prior art keywords
station
backoff
mode
indication information
operation mode
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Ceased
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PCT/CN2017/081551
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English (en)
French (fr)
Inventor
郭宇宸
杨讯
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2017215350A1 publication Critical patent/WO2017215350A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance

Definitions

  • the present invention belongs to the field of communications technologies, and in particular, to a backoff method and apparatus.
  • the existing wireless local area network (English: Wireless Local Access Network, WLAN) standard based on OFDM (English: Orthogonal Frequency-Division Multiplexing) technology is gradually evolved by 802.11a, 802.11n, 802.11.
  • the ac and other versions are composed.
  • the IEEE (English: Institute of Electrical and Electronic Engineers) 802.11 standard organization has launched a new generation WLAN standard called HEW (High Efficiency WLAN).
  • the station can simultaneously perform competitive transmission and uplink multi-user transmission based on Enhanced Distributed Channel Access (EDCA).
  • EDCA Enhanced Distributed Channel Access
  • the station receives the trigger frame sent by the access point in the EDCA-based backoff process, and obtains the uplink multi-user transmission opportunity. After the station completes the uplink multi-user transmission, the EDCA-based backoff counter of the station is set.
  • the prior art does not give a corresponding technical solution.
  • the present invention provides a backoff method and a communication device for solving the problem of how to set a backoff counter when a site faces EDCA-based contention transmission and uplink multi-user transmission.
  • an embodiment of the present invention provides a backoff method, which is applied to a wireless local area network WLAN, and the method includes:
  • the station starts the first backoff, the initial value of the backoff counter of the station is V; the station receives the trigger frame, the station stops the first backoff, and the backoff counter value of the station is V1, V ⁇ V1
  • the station performs uplink transmission according to the trigger frame; after the station completes the uplink transmission, the second backoff is started, the backoff counter value of the station is V1+V2, and V2 is the second backoff of the station. The value generated at the beginning of the moment.
  • the V1 is a value generated by the station by using a first enhanced distributed channel access EDCA parameter set
  • the V2 is a value generated by the station by using a second EDCA parameter set.
  • an embodiment of the present invention provides a backoff method, which is applied to a wireless local area network WLAN, and the method includes:
  • the first radio frame is sent by the station, where the first radio frame carries the first indication information, where the first indication information is used to indicate an operation mode supported by the station, where the operation mode includes a MU only mode, a SU only mode, and One or more of the MU+SU modes;
  • the station receives an acknowledgement frame.
  • the method further includes: the station receiving a second radio frame, the second radio frame carrying second indication information, where the second indication information is used to indicate an access point indication
  • the operation mode adopted by the site, the operation mode includes one of MU only mode, SU only mode, and MU+SU mode.
  • an embodiment of the present invention provides a communication apparatus, which is applied to a wireless local area network (WLAN), and the communication apparatus includes:
  • a baseband processor used for the first backoff, the initial value of the backoff counter is V; the baseband processor is further configured to suspend the first backoff, the backoff counter value is V1, V ⁇ V1; The baseband processor is further used for the second backoff, and the backoff counter value is V1+V2, and V2 is a value generated at the time when the second backoff starts;
  • the transceiver is configured to receive a trigger frame, and the transceiver is further configured to perform uplink transmission according to the trigger frame.
  • the V1 is a value generated by the baseband processor by using a first enhanced distributed channel access EDCA parameter set, where the V2 is generated by the baseband processor by using a second EDCA parameter set. Value.
  • an embodiment of the present invention provides a communications apparatus, which is applied to a wireless local area network (WLAN), and the communications apparatus includes:
  • a baseband processor configured to generate a first radio frame, where the first radio frame carries first indication information, where the first indication information is used to indicate an operation mode supported by the station, and the operation mode includes a MU only mode , one or more of SU only mode and MU+SU mode;
  • the transceiver is configured to send a first radio frame, and the transceiver is further configured to receive an acknowledgement frame.
  • the transceiver is further configured to receive a second radio frame, where the second radio frame carries second indication information, where the second indication information is used to indicate that the access point indicates the
  • the operating mode adopted by the station includes one of MU only mode, SU only mode, and MU+SU mode.
  • An embodiment of the present invention provides a backoff method applied to a wireless local area network, where the method includes:
  • the station starts the first backoff, the initial value of the backoff counter of the station is V; the station receives the trigger frame, the station stops the first backoff, the backoff counter value of the station is V1, V ⁇ V1; the station performs uplink transmission according to the trigger frame; After the uplink transmission is completed, the second backoff is started.
  • the backoff counter value of the station is V1+V2, and V2 is the value generated by the station at the time when the second backoff starts.
  • channel access is implemented by performing two backoffs by the station, and the fairness of channel access of different stations is ensured compared with the site that only backs up the access channel by one time.
  • FIG. 1 is a diagram of an application scenario of the present invention.
  • Embodiment 2 is a flow chart of a backoff method according to Embodiment 1 of the present invention.
  • FIG. 3 is an interaction diagram of a backoff method according to Embodiment 1 of the present invention.
  • FIG. 4 is a view showing a frame structure of first indication information according to Embodiment 2 of the present invention.
  • Figure 5 is a view showing the physical structure of the apparatus of Embodiment 4 of the present invention.
  • Figure 6 is a view showing the physical structure of the apparatus of Embodiment 5 of the present invention.
  • Figure 7 is a view showing the physical structure of the apparatus of Embodiment 6 of the present invention.
  • the embodiments of the present invention can be applied to a WLAN.
  • the standard adopted by the WLAN is the IEEE 802.11 series.
  • the WLAN may include multiple basic service sets (English: Basic Service Set, BSS for short).
  • the network nodes in the basic service set are stations (English: Station, abbreviated as STA).
  • the site includes the access point class (abbreviation: AP). , English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class sites also known as wireless access points or hotspots.
  • the AP is mainly deployed in the home, inside the building, and inside the park.
  • the typical coverage radius is tens of meters to hundreds of meters.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip.
  • the AP can support multiple formats such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Non-AP STA A non-access point class (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • a smart phone, a tablet computer and a personal computer supporting WiFi communication functions, a set top box and a smart TV supporting WiFi communication functions, a smart wearable device supporting WiFi communication function, an in-vehicle communication device supporting WiFi communication function, and supporting WiFi Communication function drone.
  • the site can support multiple formats such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. It should be noted that the Non-AP STA is simply referred to as STA below.
  • the AP and the access point are Chinese names and English names that express the same entity
  • the STA and the site are Chinese names and English names that express the same entity.
  • FIG 1 is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs, and the AP communicates with STA1-STA3.
  • the working group TGax introduced OFDMA (Orthogonal Frequency Division Multiple Access) and uplink MU-MIMO (English: Multi User-Multiple Input and Multiple Output) for the next-generation WLAN standard.
  • Chinese multi-user multi-entry and multi-out technology.
  • Embodiment 1 of the present invention provides a backoff method, which can be applied to an access point and a station, for example, the AP and STA1-STA3 in FIG. 1, and the access point and the station can support the next generation WLAN standard, for example: 802.11ax standard.
  • 2 is a flowchart of the backoff method
  • FIG. 3 is an interaction diagram of the backoff method, and the specific steps are as follows:
  • Step 101 The station starts the first backoff, and the initial value of the backoff counter of the station is V.
  • Step 102 The station receives a trigger frame, and the station stops the first backoff, and the backoff counter value of the station is V1, V ⁇ V1.
  • Step 103 The station performs uplink transmission according to the trigger frame.
  • Step 104 The second backoff is started after the station completes the uplink transmission, and the backoff counter value of the station is V1+V2, where V2 is a value generated by the station at the time when the second backoff starts.
  • the V1 is a value generated by the station by using a first enhanced distributed channel access EDCA parameter set
  • the V2 is a value generated by the station by using a second EDCA parameter set.
  • the first EDCA parameter set multiplexes the EDCA parameter set in the existing 802.11e standard.
  • the values of the first EDCA parameter set and the second EDCA parameter set include at least the following methods:
  • the second EDCA parameter set is the same as the first EDCA parameter set, wherein the EDCA parameter mainly includes CWmin (English: minimum contention window, Chinese: minimum contention window), CWmax (English: maximum contention window, Chinese: maximum competition) Window), AIFS (English: arbiterary inter frame space, Chinese: arbitrary interframe space), etc., the definition of the above parameters has been explained in detail in the 802.11e standard, and the patent application is not described again.
  • the second EDCA parameter set is different from the first EDCA parameter set, which includes two subdivisions.
  • the priority of the second EDCA parameter set is higher than the priority of the first EDCA parameter set, and the specific EDCA parameter set is for the same AC (English: Access Category, Chinese: access type) service flow.
  • the value of AIFS is smaller than the value of AIFS of the first EDCA parameter set, or the CWmax of the second EDCA parameter set is smaller than the CWmax of the first EDCA parameter set, or the CWmin of the second EDCA parameter set is smaller than the first EDCA.
  • the CWmin of the parameter set is small.
  • the priority of the second EDCA parameter set is lower than the priority of the first EDCA parameter set, and the specific performance is that, for the service flow of the same AC, the value of the AIFS in the second EDCA parameter set is higher than the first EDCA parameter set.
  • the value of AIFS is large, or the CWmax of the second EDCA parameter set is larger than the CWmax of the first EDCA parameter set, or the CWmin of the second EDCA parameter set is larger than the CWmin of the first EDCA parameter set.
  • the first EDCA parameter set and the second EDCA parameter set are sent by the access point to the station, and the broadcast message includes a form of a beacon frame or the like.
  • the backoff process in step 101 includes: 1) the site assigns CWmin to CW, 2) the station selects a random number in the [0, CW] interval, and sets the backoff counter value to perform backoff.
  • the station waits for a time interval, which is positively related to the AIFS value, and the station transmits data after waiting for the time interval.
  • the station continues to select a random number in the [0, CW] interval, and the above process is repeated, wherein the value of CW is less than CWmax.
  • step 102 when the station starts to receive the trigger frame, the station stops the first backoff, and the backoff counter value V1 of the station remains unchanged.
  • the station's backoff counter value V1 is equal to the initial value V of the station's backoff counter.
  • step 103 the station performs uplink transmission, including that the station sends an uplink physical layer protocol data unit PPDU to the AP according to the indication of the trigger frame, and the station receives the acknowledgement frame sent by the access point, where the acknowledgement frame includes a block acknowledgement (English: Block ACK, abbreviated as: BA) frame or multi-user block acknowledgement frame (abbreviation: M-BA) frame.
  • the acknowledgement frame includes a block acknowledgement (English: Block ACK, abbreviated as: BA) frame or multi-user block acknowledgement frame (abbreviation: M-BA) frame.
  • step 102 and step 103 may be repeated a plurality of times.
  • the embodiment of the present invention implements channel access by performing two backoffs by the station, where the counter value V1 of the first backoff is generated by the station by using the first enhanced distributed channel to access the EDCA, and the counter value of the second backoff is V2.
  • the counter value V1 of the first backoff is generated by the station by using the first enhanced distributed channel to access the EDCA
  • the counter value of the second backoff is V2.
  • Embodiment 2 of the present invention provides a backoff method, which can be applied to an access point and a station, such as the AP and STA1-STA3 in FIG. 1, and the access point and the station can support the next generation WLAN standard, for example: 802.11ax standard.
  • the specific steps of the backoff method are as follows:
  • Step 201 The station sends a first radio frame, where the first radio frame carries first indication information, where the first indication information is used to indicate an operation mode supported by the station, where the operation mode includes a MU only mode, and the SU One or more of the only mode and the MU+SU mode.
  • Step 202 The station receives an acknowledgement frame.
  • step 201 and step 202 perform operation mode negotiation for the station and the access point.
  • the MU only mode means that the STA does not use a single-user competition mode (such as EDCA competition mode, DCF competition mode, etc.) to send data frames, but only waits for the AP to send a trigger frame to trigger uplink transmission.
  • the STA uses only the single-user competition mode (such as the EDCA competition mode, the DCF competition mode, and the like) to send data frames.
  • the SU+MU mode means that the STA can adopt the single-user competition mode (such as the EDCA competition mode, DCF).
  • the content of the data is transmitted.
  • the AP can also send a trigger frame to trigger the uplink transmission.
  • This embodiment does not limit the indication modes of the three modes, and includes at least the following implementation manners:
  • Embodiment 1 The first indication information is represented by a bitmap (English: bitmap) including 3 bits, and each bit in the bitmap indicates whether each of the three modes is supported, for example, the bitmap is “ 101" indicates that the STA supports the MU only mode and the SU+MU mode, and does not support the SU only mode.
  • bitmap English: bitmap
  • the correspondence between the three bits and the mode is not limited.
  • the first indication information includes three fields, which respectively correspond to the MU only mode, the SU only mode, and the SU+MU mode.
  • the first indication information may be carried in the HE capability information field, and the HE capability information field may be located in the HE capability element.
  • the HE capability element may be carried in an association request Association request frame, as shown in FIG.
  • the method further includes:
  • the second radio frame is received by the station, where the second radio frame carries the second indication information, where the second indication information is used to indicate that the access point indicates an operation mode adopted by the station, and the operation mode includes the MU only mode. , SU only mode and one of the MU+SU modes.
  • the action after the station receives the second radio frame includes the following situations.
  • Case 1 The station sends an acknowledgement frame containing positive or negative information.
  • the affirmative information means that the STA will adopt the operation mode indicated by the AP, and the negative information refers to the operation mode that the STA refuses to adopt the indication indicated by the AP.
  • the second indication information carries the MU only mode.
  • the AP instructs the STA to enter the MU only mode.
  • the network load is large, if the STA still uses a single user mode such as EDCA to contend for data transmission, the collision probability is greatly increased. The channel access probability is reduced.
  • the AP can notify the STA to enter the MU only mode, so that the AP can obtain the channel transmission trigger frame to trigger the STA to perform uplink transmission.
  • the STA may also perform the operation mode conversion to the requesting AP, and the flow is as follows:
  • Step 1 The STA sends a mode switching control frame to the AP, where the mode switching control frame carries the indication information, where the indication information is used to indicate an operation mode that the STA wishes to adopt, and the operation mode includes the MU only mode, SU only One of the modes and the MU+SU mode.
  • Step 2 The AP sends an acknowledgement frame to the STA.
  • the acknowledgement frame may include indication information of positive acknowledgment or negative acknowledgment, the positive acknowledgment means that the STA can adopt the requested operation mode, and the negative acknowledgment means that the STA cannot adopt the requested operation mode.
  • the station reports the operation mode supported by the access point to the access point, and receives the operation mode switching indication sent by the access point.
  • the access point implements scheduling of the station, reduces the collision probability, and improves the channel access probability.
  • Embodiment 3 of the present invention provides a backoff method, which can be applied to an access point and a station, for example, an AP and a STA1-STA3 in FIG. 1, and the access point and the station can support a next-generation WLAN standard, for example: 802.11ax standard.
  • the specific steps of the backoff method are as follows:
  • Step 301 The station sends a buffer status report BSR.
  • Step 302 The station receives an acknowledgement frame.
  • Step 303 The station uses the second EDCA parameter set to perform backoff.
  • the station can perform backoff using the first EDCA parameter set and the second EDCA parameter set to implement channel access.
  • the third embodiment of the present invention provides that when the AP receives the buffer status report (BSR), the AP will trigger the STA to send uplink data in a scheduling manner. The STA is notified to use the second EDCA parameter set to perform backoff to avoid collision with the AP.
  • BSR buffer status report
  • the BSR can be carried in the QoS control field or in the HE control field.
  • the mode switching information in step 302 may be carried in the HE control field of the acknowledgment frame, or may be carried in the frame control field, or a new control domain may be defined to be carried, which is not limited in this embodiment.
  • the BSR in step 301 is channel-accessed and transmitted by the station through the first EDCA backoff.
  • the station receives an acknowledgement frame.
  • the STA will use the second EDCA parameter set backoff to implement channel access and transmit data.
  • the station after receiving the buffer status report, the station receives the acknowledgement frame sent by the access point, and the site uses the multi-user EDCA backoff to implement channel access and send data.
  • the access point implements scheduling of the station, reduces the collision probability, and improves the channel access probability.
  • the communication device is, for example, an access point or a dedicated circuit or chip that implements related functions.
  • the communication device 1000 includes a processor 1010, a memory 1020, a baseband processor 1030, a transceiver 1040, an antenna 1050, a bus 1060, and a user interface 1070.
  • the communication device may be STA1-STA3 shown in FIG.
  • processor 1010 controls the operation of communication device 1000, which may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device.
  • Memory 1020 can include read only memory and random access memory and provides instructions and data to processor 1010, and a portion of memory 1020 can also include non-volatile random access memory (NVRAM).
  • the processor 1010 typically executes program instructions in the memory 1020 to implement the logical and arithmetic operations of the backoff method of the present application.
  • the baseband processor 1030 is configured to generate a baseband signal (eg, a frame or a data packet), or parse the received baseband signal to obtain data, wherein the baseband processor includes an encoder and a modulator, and the encoder can improve the robustness of the baseband signal. Sexuality, overcomes interference and fading in the wireless propagation environment, and reduces errors caused by transmission.
  • the modulator can select the appropriate signal modulation method according to the wireless propagation environment.
  • the transceiver 1040 includes a transmitting circuit and a receiving circuit.
  • the transmitting circuit is used for the baseband signal generated by the baseband processor 1030 to adopt up-conversion modulation to obtain a high-frequency carrier signal.
  • the high-frequency carrier signal is transmitted through the antenna 1050, and the receiving circuit receives the antenna 1050.
  • the high frequency signal is subjected to a down conversion operation to obtain a low frequency baseband signal.
  • the number of antennas 1050 is one or more.
  • the communication device 1000 can also include a user interface 1070 that includes a keyboard, a pickup, and/or a touch screen. User interface 1070 can communicate content and control operations to communication device 1000.
  • bus 1060 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • various buses are labeled as bus system 1060 in the figure. It should be noted that the foregoing description of the access point structure can be applied to subsequent embodiments.
  • the baseband processor 1030 is configured to perform the first backoff, and the initial value of the backoff counter is V.
  • the baseband processor is further configured to suspend the first backoff, and the backoff counter value is V1, V ⁇ V1;
  • the baseband processor is further used for the second backoff, and the backoff counter value is V1+V2, and V2 is a value generated at a time when the second backoff starts;
  • the transceiver 1040 is configured to receive a trigger frame, where the transceiver is further configured to perform uplink transmission according to the trigger frame.
  • the V1 is a value generated by the baseband processor by using a first enhanced distributed channel access EDCA parameter set
  • the V2 is a value generated by the baseband processor by using a second EDCA parameter set.
  • the operations performed by the baseband processor 1030 may be performed by a processing unit or a processing module.
  • the operations performed by the transceiver 1040 can be performed by a transceiver unit or a transceiver module.
  • first EDCA parameter set and the second EDCA parameter set are described in detail in Embodiment 1, No longer.
  • the baseband processor of the communication device performs two times of backoff to implement channel access, where the counter value V1 of the first backoff is generated by the first enhanced distributed channel access EDCA, and the counter value of the second backoff is generated. V2 is generated by the second EDCA. In the above manner, the fairness of channel access of different stations is ensured compared with the site that bypasses the access channel only once.
  • FIG. 6 A schematic block diagram of a communication apparatus for a backoff method provided by Embodiment 5 of the present application, as shown in FIG. 6, the apparatus is, for example, an access point, a station, a base station, or a user terminal, and the apparatus may also implement related functions.
  • ASIC Application Specific Integrated Circuit
  • the apparatus 1100 includes a processor 1110, a memory 1120, a baseband processor 1130, a transceiver 1140, an antenna 1150, a bus 1160, and a user interface 1170.
  • the device may be STA1-STA3 shown in FIG. The components of the device 1100 have been explained in detail in Embodiment 4 and will not be described again.
  • the baseband processor 1130 is configured to generate a first radio frame, where the first radio frame carries first indication information, where the first indication information is used to indicate an operation mode supported by the station, where the operation mode includes MU only Mode, one or more of SU only mode and MU+SU mode;
  • the transceiver 1140 is configured to send a first radio frame, and the transceiver is further configured to receive an acknowledgement frame.
  • the transceiver is further configured to receive a second radio frame, where the second radio frame carries second indication information, where the second indication information is used to indicate that the access point indicates an operation mode adopted by the station.
  • the operation mode includes one of a MU only mode, a SU only mode, and a MU+SU mode.
  • the operations performed by the baseband processor 1030 may be performed by a processing unit or a processing module.
  • the operations performed by the transceiver 1040 can be performed by a transceiver unit or a transceiver module.
  • the transceiver of the communication device reports the operation mode supported by itself and receives the operation mode switching instruction. In the above manner, the collision probability is reduced and the channel access probability is improved.
  • FIG. 7 A schematic block diagram of a communication apparatus for a backoff method according to Embodiment 6 of the present application, as shown in FIG. 7, the apparatus is, for example, an access point, a station, a base station, or a user terminal, and the apparatus may also implement related functions.
  • ASIC Application Specific Integrated Circuit
  • the apparatus 1200 includes a processor 1210, a memory 1220, a baseband processor 1230, a transceiver 1240, an antenna 1250, a bus 1260, and a user interface 1270.
  • the device may be STA1-STA3 shown in FIG. The components of the device 1200 have been explained in detail in Embodiment 4 and will not be described again.
  • the baseband processor 1230 is configured to perform backoff by using the second EDCA parameter set.
  • the transceiver 1240 is configured to send a buffer status report BSR, and the transceiver is further configured to receive an acknowledgement frame.
  • the station can perform backoff using the first EDCA parameter set and the second EDCA parameter set to implement channel access.
  • the sixth embodiment of the present invention provides that when the AP receives the BSR sent by the STA, the AP may trigger the STA to send the uplink data by using the scheduling mode. Therefore, the STA may be notified to use the second EDCA parameter set to perform the backoff and avoid the AP. There is a conflict.
  • the acknowledgement frame is received, and the communication is received.
  • the baseband processor of the device implements channel access using multi-user EDCA backoff. In the above manner, the collision probability is reduced and the channel access probability is improved.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk, etc. includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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Abstract

本申请实施例提供了一种应用于无线局域网的退避方法，该方法包括：站点开始第一次退避，站点的退避计数器的初始值为V；站点接收触发帧，站点中止第一次退避，站点的退避计数器值为V1，V≥V1；站点根据触发帧进行上行传输；站点完成上行传输后开始第二次退避，站点的退避计数器值为V1+V2，V2为站点在第二次退避开始的时刻生成的值。本申请实施例还提供了相应的通信装置。通过上述方式，本申请实施例通过站点进行两次退避实现信道接入，与只通过一次退避接入信道的站点相比，保证了不同站点信道接入的公平性。

Description

一种退避方法和装置
本申请要求于2016年6月14日提交中国专利局、申请号为201610415271.2、发明名称为“一种退避方法和装置”的CN专利申请的优先权，上述申请的全部内容通过引用结合在本申请中。
技术领域
本发明属于通信技术领域，尤其涉及一种退避方法和装置。
背景技术
现有基于OFDM(英文：Orthogonal Frequency-Division Multiplexing，中文：正交频分复用)技术的无线局域网(英文：Wireless local Access Network，简称：WLAN)标准由逐步演进的802.11a、802.11n、802.11ac等版本组成，目前IEEE(英文：Institute of Electrical and Electronic Engineers，中文：电气与电子工程师协会)802.11标准组织已启动了称之为HEW(High Efficiency WLAN，高效率无线局域网)的新一代WLAN标准802.11ax的标准化工作，通过引入OFDMA(Orthogonal Frequency Division Multiple Access，正交频分复用多址)技术，802.11ax可以进一步提高WLAN在密集用户场景下的传输性能。
802.11ax规定，站点可以同时进行基于增强分布式信道接入(英文：Enhanced Distributed Channel Access，简称：EDCA)的竞争传输和上行多用户传输。站点在基于EDCA的退避过程中收到接入点发送的触发帧，获得上行多用户传输机会，当站点完成该上行多用户传输之后，站点的基于EDCA的退避计数器如何设置。对于上述场景，现有技术没有给出对应的技术方案。
发明内容
有鉴于此，本发明提供一种退避方法和通信装置，用于解决站点面对基于EDCA的竞争传输和上行多用户传输时，如何设置退避计数器的问题。
第一方面，本发明实施例提供了一种退避方法，应用于无线局域网WLAN，该方法包括：
站点开始第一次退避，所述站点的退避计数器的初始值为V；所述站点接收触发帧，所述站点中止所述第一次退避，所述站点的退避计数器值为V1，V≥V1；所述站点根据所述触发帧进行上行传输；所述站点完成所述上行传输后开始第二次退避，所述站点的退避计数器值为V1+V2，V2为所述站点在第二次退避开始的时刻生成的值。
在一种可能的实现方式中，所述V1为所述站点通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述站点通过第二EDCA参数集生成的值。
第二方面，本发明实施例提供了一种退避方法，应用于无线局域网WLAN，该方法包括：
站点发送第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种；
所述站点接收确认帧。
在一种可能的实现方式中，所述方法还包括：所述站点接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
第三方面，本发明实施例提供了一种通信装置，应用于无线局域网WLAN，该通信装置包括：
基带处理器，用于第一次退避，退避计数器的初始值为V；所述基带处理器，还用于中止所述第一次退避，所述退避计数器值为V1，V≥V1；所述基带处理器，还用于第二次退避，所述退避计数器值为V1+V2，V2为第二次退避开始的时刻生成的值；
收发器，用于接收触发帧；所述收发器，还用于根据所述触发帧进行上行传输。
在一种可能的实现方式中，所述V1为所述基带处理器通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述基带处理器通过第二EDCA参数集生成的值。
第四方面，本发明实施例提供了一种通信装置，应用于无线局域网WLAN，该通信装置包括：
基带处理器，用于生成第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种；
收发器，用于发送第一无线帧；所述收发器，还用于接收确认帧。
在一种可能的实现方式中，所述收发器，还用于接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
本发明实施例提供了一种应用于无线局域网的退避方法，该方法包括：
站点开始第一次退避，站点的退避计数器的初始值为V；站点接收触发帧，站点中止第一次退避，站点的退避计数器值为V1，V≥V1；站点根据触发帧进行上行传输；站点完成上行传输后开始第二次退避，站点的退避计数器值为V1+V2，V2为站点在第二次退避开始的时刻生成的值。本发明实施例通过站点进行两次退避实现信道接入，与只通过一次退避接入信道的站点相比，保证了不同站点信道接入的公平性。
附图说明
图1为本发明的应用场景图。
图2为本发明中实施例1的退避方法流程图。
图3为本发明中实施例1的退避方法交互图。
图4为本发明中实施例2的第一指示信息的帧结构图。
图5为本发明中实施例4的装置物理结构图。
图6为本发明中实施例5的装置物理结构图。
图7为本发明中实施例6的装置物理结构图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明具体实施例作进一步的详细描述。为了全面理解本发明，在以下详细描述中提到了众多具体细节。
本发明实施例可以应用于WLAN，目前WLAN采用的标准为IEEE802.11系列。WLAN可以包括多个基本服务集(英文：Basic Service Set，简称：BSS)，基本服务集中的网络节点为站点(英文：Station，简称：STA)，站点包括接入点类的站点(简称：AP，英文：Access Point)和非接入点类的站点(英文：None Access Point Station，简称：Non-AP STA)。每个基本服务集可以包含一个AP和多个关联于该AP的Non-AP STA。
接入点类站点，也称之为无线访问接入点或热点等。AP主要部署于家庭、大楼内部以及园区内部，典型覆盖半径为几十米至上百米。AP相当于一个连接有线网和无线网的桥梁，其主要作用是将各个无线网络客户端连接到一起，然后将无线网络接入以太网。具体地，AP可以是带有WiFi(英文：Wireless Fidelity,中文：无线保真)芯片的终端设备或者网络设备。AP可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种制式。
非接入点类的站点(英文：None Access Point Station，简称：Non-AP STA)，可以是无线通讯芯片、无线传感器或无线通信终端。具体地，例如：支持WiFi通讯功能的智能手机、平板电脑和个人计算机，支持WiFi通讯功能的机顶盒和智能电视，支持WiFi通讯功能的智能可穿戴设备，支持WiFi通讯功能的车载通信设备和支持WiFi通讯功能的无人机。站点可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种制式。需要说明的是，下文将Non-AP STA简称为STA。
需要说明的是，本专利申请中AP与接入点为表达同一实体的中文名称和英文名称，STA与站点为表达同一实体的中文名称和英文名称。
图1为一个典型的WLAN部署场景的系统示意图，包括一个AP和3个STA，AP与STA1-STA3进行通信。对于802.11家族，工作组TGax针对下一代WLAN标准引入了OFDMA(英文：Orthogonal Frequency Division Multiple Access，中文：正交频分多址)和上行MU-MIMO(英文：Multi User-Multiple Input and Multiple Output，中文：多用户多入多出)技术。采用上述技术后，STA1-STA3可以在相同时间的不同频率资源上或者相同时间的不同空间流上与AP传输数据。
实施例1
本发明实施例1提供了一种退避方法，该方法可以应用于接入点和站点，例如：图1中的AP和STA1-STA3，该接入点和站点可以支持下一代WLAN标准，例如：802.11ax制式。图2是该退避方法的流程图，图3是该退避方法的交互图，具体步骤如下：
步骤101：站点开始第一次退避，所述站点的退避计数器的初始值为V。
步骤102：所述站点接收触发帧，所述站点中止所述第一次退避，所述站点的退避计数器值为V1，V≥V1。
步骤103：所述站点根据所述触发帧进行上行传输。
步骤104：所述站点完成所述上行传输后开始第二次退避，所述站点的退避计数器值为V1+V2，V2为所述站点在第二次退避开始的时刻生成的值。
可选地，所述V1为所述站点通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述站点通过第二EDCA参数集生成的值。其中，第一EDCA参数集复用现有802.11e标准中的EDCA参数集。
进一步地，第一EDCA参数集和第二EDCA参数集的取值至少包括以下几种方式：
1)第二EDCA参数集与第一EDCA参数集相同，其中，EDCA的参数主要指包括CWmin(英文：minimum contention window，中文：最小竞争窗)，CWmax(英文：maximum contention window，中文：最大竞争窗)，AIFS(英文：arbitrary inter frame space，中文：任意帧间间隔)等，上述参数的定义在802.11e标准中已经详细阐释，本专利申请不再赘述。
2)第二EDCA参数集与第一EDCA参数集不同，其中包含两种细分的情形。
情形2.1，第二EDCA参数集的优先级比第一EDCA参数集的优先级高，具体表现为，对于相同AC(英文：Access Category,中文：接入类型)的业务流，第二EDCA参数集的AIFS的取值比第一EDCA参数集的AIFS的取值小，或者，第二EDCA参数集的CWmax比第一EDCA参数集的CWmax小，或者，第二EDCA参数集的CWmin比第一EDCA参数集的CWmin小。
情形2.2，第二EDCA参数集的优先级比第一EDCA参数集的优先级低，具体表现为，对于相同AC的业务流，第二EDCA参数集的中AIFS的取值比第一EDCA参数集的AIFS的取值大，或者，第二EDCA参数集的CWmax比第一EDCA参数集的CWmax大，或者，第二EDCA参数集的CWmin比第一EDCA参数集的CWmin大。
需要补充的是，第一EDCA参数集和第二EDCA参数集由接入点发送广播消息给站点，所述广播消息包括信标帧等形式。
需要说明的是，步骤101中退避过程包括：1)站点将CWmin赋值给CW，2)站点在[0,CW]区间内选择一个随机数，设为退避计数器值后进行退避。
如果退避计数器为0后，站点获得信道接入，则站点等待一个时间间隔，该时间间隔与AIFS值正相关，站点完成该时间间隔的等待后，发送数据。
如果退避计数器为0后，没有获得信道接入，则CW的值加倍，站点继续在在[0,CW]区间内选择一个随机数，重复进行上述过程，其中CW的值小于CWmax。
需要说明的是，步骤102中，当站点开始接收触发帧，站点中止第一次退避，此时站点的退避计数器值V1保持不变。当站点刚开始第一次退避时，就收到触发帧，那么站点的退避计数器值V1等于站点的退避计数器的初始值V。
需要说明的是，步骤103中站点进行上行传输包括站点根据触发帧的指示发送上行物理层协议数据单元PPDU给AP，站点接收接入点发送的确认帧，所述确认帧包括块确认(英文：Block ACK，简称：BA)帧或多用户块确认帧(简称：M-BA)帧。并且，上述退避方法中，步骤102和步骤103可以重复多次。
本发明实施例通过站点进行两次退避实现信道接入，其中第一次退避的计数器值V1为所述站点通过第一增强分布式信道接入EDCA生成，所述第二次退避的计数器值V2为所述站点通过第二EDCA生成，通过上述方式，与只通过一次退避接入信道的站点相比，保证了不同站点信道接入的公平性。
实施例2
本发明实施例2提供了一种退避方法，该方法可以应用于接入点和站点，例如：图1中的AP和STA1-STA3，该接入点和站点可以支持下一代WLAN标准，例如：802.11ax制式。该退避方法的具体步骤如下：
步骤201：站点发送第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种。
步骤202：所述站点接收确认帧。
需要说明的是，步骤201和步骤202为站点和接入点进行操作模式协商。
具体来说，MU only模式是指所述STA不采用单用户竞争方式(如EDCA竞争方式，DCF竞争方式等)发送数据帧，而只能等待AP发送触发帧触发其进行上行传输。SU only模式是指STA只采用单用户竞争方式(如EDCA竞争方式，DCF竞争方式等)发送数据帧；所述SU+MU模式是指STA既可以采用单用户竞争方式(如EDCA竞争方式，DCF竞争方式等)发送数据帧，也可以等待AP发送触发帧触发其进行上行传输。
本实施例对三种模式的指示方式不做限定，至少包括以下实施方式：
实施方式1：所述第一指示信息用一个包含3个比特的位图(英文：bitmap)表示，所述bitmap中的每一个比特表示三种模式中的每一种是否支持，如bitmap为“101”表示所述STA支持MU only模式以及SU+MU模式，不支持SU only模式。其中，3个比特与模式之间的对应关系不做限定。
实施方式2：所述第一指示信息包含3个字段，分别对应MU only模式，SU only模式以及SU+MU模式。
需要说明的是，所述第一指示信息可以承载于HE capability information field中，所述HE capability information field可以位于HE capability element中。所述HE capability element可以在关联请求Association request帧中携带，如图4所示。
可选地，所述方法还包括：
所述站点接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
需要说明的是，站点接收第二无线帧后的动作包含以下情形。
情形1：所述站点发送确认帧，所述确认帧包含肯定信息或否定信息。其中，肯定信息是指STA将采用AP所指示的操作模式，否定信息是指STA拒绝采用AP指示的操作模式。
情形2：若所述无线帧是信标帧，此时站点不发送确认帧，AP默认站点回复了肯定信息。
优选地，第二指示信息携带MU only模式，此时AP指示STA进入MU only模式，当网络负载较大时，若STA依然采用EDCA等单用户方式竞争信道进行数据传输，将大大增加冲突概率，降低信道接入概率，这时AP可以通知STA进入MU only模式，便于AP获得信道发送触发帧来触发STA进行上行传输。
需要补充的是，除了AP向STA指示操作模式之外，STA也可以向请求AP进行操作模式的转换，流程如下：
步骤1：STA向AP发送模式转换控制帧，所述模式转换控制帧中携带指示信息，所述指示信息用于指示所述STA希望采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
步骤2：AP向所述STA发送确认帧。类似地，所述确认帧中可以包含肯定确认或否定确认的指示信息，肯定确认是指STA可以采用请求的操作模式，否定确认是指STA不能采用请求的操作模式。
本发明实施例中，站点向接入点上报自身支持的操作模式，以及接收接入点发送的操作模式切换指示。通过上述方式，接入点实现对站点的调度，降低了冲突概率，提高信道接入概率。
实施例3
本发明实施例3提供了一种退避方法，该方法可以应用于接入点和站点，例如：图1中的AP和STA1-STA3，该接入点和站点可以支持下一代WLAN标准，例如：802.11ax制式。该退避方法的具体步骤如下：
步骤301：站点发送缓冲区状态报告BSR；
步骤302：所述站点接收确认帧；
步骤303：所述站点采用第二EDCA参数集进行退避。
需要说明的是，实施例1中已经提到，站点可以使用第一EDCA参数集和第二EDCA参数集进行退避，实现信道接入。本发明实施例3提出，当AP接收到STA发送的缓冲区状态报告(英文：buffer status report，简称：BSR)时，由于此时AP会采用调度的方式触发所述STA发送上行数据，因此可以通知STA采用第二EDCA参数集进行退避，避免与AP产生冲突。
需要说明的是，BSR可以在QoS control field中携带，也可以在HE control field中携带。对于步骤302中的模式切换信息，可以携带于确认帧的HE control field中，也可以携带于frame control field中，也可以定义一个新的控制域来承载，本实施例对此不做限定。
需要说明的是，步骤301中的BSR由站点通过第一EDCA退避实现信道接入并发送。步骤302中，站点收到确认帧。步骤303中STA将采用第二EDCA参数集退避实现信道接入并发送数据。
本发明实施例中，站点发送缓冲区状态报告后，收到接入点发送的确认帧，站点采用多用户EDCA退避实现信道接入并发送数据。通过上述方式，接入点实现对站点的调度，降低了冲突概率，提高信道接入概率。
实施例4
请参照图5，为本发明实施例4提供的一种无线局域网中用于退避的通信装置的示意性框图，该通信装置例如为接入点，或者实现相关功能的专用电路或者芯片。该通信装置1000包括处理器1010、存储器1020、基带处理器1030、收发器1040、天线1050、总线1060和用户接口1070。该通信装置可以为图1中示出的STA1-STA3。
具体地，处理器1010控制通信装置1000的操作，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件。存储器1020可以包括只读存储器和随机存取存储器，并向处理器1010提供指令和数据，存储器1020的一部分还可以包括非易失性随机存取存储器(NVRAM)。处理器1010通常执行存储器1020中的程序指令，实现本申请中退避方法的逻辑运算和算术运算。
基带处理器1030用于生成基带信号(例如：帧或数据包)，或者对接收到的基带信号进行解析获取数据，其中基带处理器包括编码器和调制器，编码器可以提高基带信号的鲁棒性，克服无线传播环境中的干扰和衰落，减少传输产生的差错。调制器可以根据无线传播环境，选取合适的信号调制方式。
收发器1040包括发送电路和接收电路，发送电路用于基带处理器1030生成的基带信号采用上变频调制，得到高频的载波信号，高频的载波信号通过天线1050发射，接收电路将天线1050接收的高频信号采用下变频操作，得到低频的基带信号。其中天线1050的数目为一个或多个。通信装置1000还可以包括用户接口1070，用户接口1070包括键盘，拾音器和/或触摸屏。用户接口1070可传递内容和控制操作到通信装置1000。
通信装置1000的各个组件通过总线1060耦合在一起，其中总线系统1060除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统1060。需要说明的是，上述对于接入点结构的描述，可应用于后续的实施例。
基带处理器1030，用于第一次退避，退避计数器的初始值为V；所述基带处理器，还用于中止所述第一次退避，所述退避计数器值为V1，V≥V1；所述基带处理器，还用于第二次退避，所述退避计数器值为V1+V2，V2为第二次退避开始的时刻生成的值；
收发器1040，用于接收触发帧；所述收发器，还用于根据所述触发帧进行上行传输。
可选地，所述V1为所述基带处理器通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述基带处理器通过第二EDCA参数集生成的值。
需要说明的是，所述基带处理器1030执行的操作可以由处理单元或处理模块来执行。所述收发器1040执行的操作可以由收发单元或收发模块来执行。
需要说明的是，第一EDCA参数集和第二EDCA参数集在实施例1中已有详细介绍， 不再赘述。
本发明实施例中通信装置的基带处理器进行两次退避实现信道接入，其中第一次退避的计数器值V1通过第一增强分布式信道接入EDCA生成，所述第二次退避的计数器值V2通过第二EDCA生成，通过上述方式，与只通过一次退避接入信道的站点相比，保证了不同站点信道接入的公平性。
实施例5
本申请实施例5提供的一种用于退避方法的通信装置的示意性框图，如图6所示，该装置例如为接入点、站点、基站或者用户终端，该装置也可以为实现相关功能的专用集成电路(英文：Application Specific Integrated Circuit，简称：ASIC)或者芯片。该装置1100包括处理器1110、存储器1120、基带处理器1130、收发器1140、天线1150、总线1160和用户接口1170。该装置可以为图1中示出的STA1-STA3。装置1100的各组件在实施例4中已有详细阐释，不再赘述。
基带处理器1130，用于生成第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种；
收发器1140，用于发送第一无线帧；所述收发器，还用于接收确认帧。
可选地，所述收发器，还用于接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
需要说明的是，所述基带处理器1030执行的操作可以由处理单元或处理模块来执行。所述收发器1040执行的操作可以由收发单元或收发模块来执行。
本发明实施例中，通信装置的收发器上报自身支持的操作模式，以及接收操作模式切换指示。通过上述方式，降低了冲突概率，提高信道接入概率。
实施例6
本申请实施例6提供的一种用于退避方法的通信装置的示意性框图，如图7所示，该装置例如为接入点、站点、基站或者用户终端，该装置也可以为实现相关功能的专用集成电路(英文：Application Specific Integrated Circuit，简称：ASIC)或者芯片。该装置1200包括处理器1210、存储器1220、基带处理器1230、收发器1240、天线1250、总线1260和用户接口1270。该装置可以为图1中示出的STA1-STA3。装置1200的各组件在实施例4中已有详细阐释，不再赘述。
基带处理器1230，用于采用第二EDCA参数集进行退避。
收发器1240，用于发送缓冲区状态报告BSR；所述收发器，还用于接收确认帧。
需要说明的是，实施例1中已经提到，站点可以使用第一EDCA参数集和第二EDCA参数集进行退避，实现信道接入。本发明实施例6提出，当AP接收到STA发送的BSR时，由于此时AP会采用调度的方式触发所述STA发送上行数据，因此可以通知STA采用第二EDCA参数集进行退避，避免与AP产生冲突。
本发明实施例中，通信装置的收发器发送缓冲区状态报告后，收到确认帧，通信 装置的基带处理器采用多用户EDCA退避实现信道接入。通过上述方式，降低了冲突概率，提高信道接入概率。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发明可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。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可读取的存储介质中，如计算机的软盘，硬盘或光盘等，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)执行本发明各个实施例所述的方法。

Claims (8)

  1. 一种退避方法，应用于无线局域网WLAN，其特征在于，所述方法包括：
    站点开始第一次退避，所述站点的退避计数器的初始值为V；
    所述站点接收触发帧，所述站点中止所述第一次退避，所述站点的退避计数器值为V1，V≥V1；
    所述站点根据所述触发帧进行上行传输；
    所述站点完成所述上行传输后开始第二次退避，所述站点的退避计数器值为V1+V2，V2为所述站点在第二次退避开始的时刻生成的值。
  2. 根据权利要求1所述的方法，其特征在于，所述V1为所述站点通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述站点通过第二EDCA参数集生成的值。
  3. 一种退避方法，应用于无线局域网WLAN，其特征在于，所述方法包括：
    站点发送第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种；
    所述站点接收确认帧。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    所述站点接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
  5. 一种通信装置，应用于无线局域网WLAN，其特征在于，所述通信装置包括：
    基带处理器，用于第一次退避，退避计数器的初始值为V；
    所述基带处理器，还用于中止所述第一次退避，所述退避计数器值为V1，V≥V1；
    所述基带处理器，还用于第二次退避，所述退避计数器值为V1+V2，V2为第二次退避开始的时刻生成的值；
    收发器，用于接收触发帧；
    所述收发器，还用于根据所述触发帧进行上行传输。
  6. 根据权利要求5所述的通信装置，其特征在于，所述V1为所述基带处理器通过第一增强分布式信道接入EDCA参数集生成的值，所述V2为所述基带处理器通过第二EDCA参数集生成的值。
  7. 一种通信装置，应用于无线局域网WLAN，其特征在于，所述通信装置包括：
    基带处理器，用于生成第一无线帧，所述第一无线帧携带第一指示信息，所述第一指示信息用来指示所述站点所支持的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种或多种；
    收发器，用于发送第一无线帧；
    所述收发器，还用于接收确认帧。
  8. 根据权利要求7所述的通信装置，其特征在于，所述收发器，还用于接收第二无线帧，所述第二无线帧携带第二指示信息，所述第二指示信息用于指示接入点指示所 述站点采用的操作模式，所述操作模式包含MU only模式，SU only模式以及MU+SU模式中的一种。
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