WO2017114040A1 - 一种传输机会控制方法及装置 - Google Patents

一种传输机会控制方法及装置 Download PDF

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Publication number
WO2017114040A1
WO2017114040A1 PCT/CN2016/107093 CN2016107093W WO2017114040A1 WO 2017114040 A1 WO2017114040 A1 WO 2017114040A1 CN 2016107093 W CN2016107093 W CN 2016107093W WO 2017114040 A1 WO2017114040 A1 WO 2017114040A1
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WIPO (PCT)
Prior art keywords
frame
access point
station
txop
duration
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Ceased
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PCT/CN2016/107093
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English (en)
French (fr)
Inventor
苏宏家
朱俊
林英沛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP20176437.0A priority Critical patent/EP3761748B1/en
Priority to EP16880830.1A priority patent/EP3383122B1/en
Priority to EP22194530.6A priority patent/EP4195859B1/en
Publication of WO2017114040A1 publication Critical patent/WO2017114040A1/zh
Priority to US16/019,569 priority patent/US10638384B2/en
Anticipated expiration legal-status Critical
Priority to US16/842,792 priority patent/US11683732B2/en
Ceased legal-status Critical Current

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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
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • 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
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present application relates to the field of communications, and in particular, to a transmission opportunity control method and apparatus.
  • a device in a Wireless Local Area Network needs to obtain the right to use channel resources through competition, that is, a Transmission Opportunity (TXOP) holder.
  • TXOP Transmission Opportunity
  • access point class Access Point
  • STA Non-access point class
  • AP Access Point
  • STA Non Access Point Station
  • the AP can perform uplink and downlink transmission scheduling on different STAs on different time-frequency resources to improve system resource utilization.
  • the competition will be stronger, and the probability that the AP will successfully contend for the channel will be lower. If the AP cannot become the TXOP holder, the multi-user scheduling transmission cannot be performed. Not conducive to improving resource utilization.
  • the present application provides a transmission opportunity control method and apparatus, aiming at improving AP becoming Opportunities for TXOP holders to increase resource utilization in WLAN systems.
  • a first aspect of the present application provides a transmission opportunity control method, including: an access point transmitting a first frame, where the first frame carries a TXOP handover mandatory THE indication field, where the THE indication field is a first value or a a second value, the first value is used to indicate that the station accessing the channel transfers the held TXOP to the access point, and the second value is used to indicate that the site of the access channel meets the handover condition
  • the held TXOP is handed over to the access point.
  • the STA transfers the TXOP to the AP, which increases the probability of the AP scheduling the STA, thereby facilitating the utilization of resources.
  • a second aspect of the present application provides an access point, including: a first transmitter, configured to send a first frame, where the first frame carries a TXOP handover mandatory THE indication field, where the THE indication field is first a value or a second value, the first value is used to indicate that the station accessing the channel hands over the TXOP held by the access point to the access point, and the second value is used to indicate that the station of the access channel satisfies the handover In the case of a condition, the held TXOP is handed over to the access point.
  • the THE indication field is the first value, or the THE indication field is the second value, and the site of the access channel meets the And the second frame is used to indicate that the TXOP is handed over to the access point.
  • the handover condition includes: the duration of the station competing to use the channel is greater than a handover threshold, and the handover threshold is that the access point is The duration of the competition provided by the station for the contention channel; the handover threshold is determined by the access point according to the network condition and sent to the station.
  • a third aspect of the present application provides a transmission opportunity control method, including: an access point receives a third frame, where the third frame carries a first duration and a TXOP transfer permission TTG field, where the first duration is The station accessing the channel is determined according to the TXOP held by itself; when the TTG field is the third value, the access point sends a fourth frame to the station of the access channel, where the fourth frame carries the fourth frame a second duration, the second duration is determined by a TXOP requested by the access point, a length of the second duration is greater than a length of the first duration, and a TXOP requested by the access point is to be held by the site
  • the TXOP is extended by the preset duration.
  • the AP can hold the TXOP2, thereby facilitating the utilization of resources.
  • a fourth aspect of the present application provides an access point, including: a second receiver, configured to receive a third frame, where the third frame carries a first Duration and TXOP transfer permission TTG field, the first Duration Determining, by the station of the access channel, according to the TXOP held by the station; and a second transmitter, configured to send a fourth frame to the station of the access channel if the TTG field is the third value,
  • the fourth frame carries a second duration, where the second duration is determined by the TXOP requested by the access point, the length of the second duration is greater than the length of the first duration, and the TXOP requested by the access point is The TXOP held by the station is extended by a preset duration.
  • the method further includes: when the TTG field is a fourth value, the access point sends a fifth frame, where the fifth frame carries the First Duration.
  • the method further includes: the access point holding the request of the access point TXOP.
  • the method further includes: sending, by the access point, the station that sends the access channel The contention-free period ends the CF-End-X frame, and the CF-End-X frame carries the second duration, and the CF-End-X frame is used to indicate that the access channel is in the The data transmission during a duration ends; the access point holds the TXOP requested by the access point.
  • a fifth aspect of the present application provides a transmission opportunity control method, including: a station receiving a first frame sent by an access point, where the first frame carries a TXOP handover mandatory THE indication field; where the THE indication field is In the case of a value, the station sends a second frame to the access point, the second frame information being used to indicate that the TXOP is handed over to the access point.
  • a sixth aspect of the present application provides a station, including: a third receiver, configured to receive a first frame sent by an access point, where the first frame carries a TXOP handover mandatory THE indication field; and a third transmitter And, in a case that the THE indication field is a first value, sending a second frame to the access point, where the second frame information is used to indicate that the TXOP is handed over to the access point.
  • the method further includes: if the THE indication field is a second value, the site determines whether the handover condition is met, and if the handover condition is met, The station transmits the TXOP handoff frame to the access point.
  • the handover condition includes:
  • the time that the station contends to use the channel is greater than a handover threshold, and the handover threshold is a competition duration provided by the access point for the station for a contention channel.
  • a seventh aspect of the present application provides a transmission opportunity control method, including: a station sends a third frame to an access point, where the third frame carries a first duration and a handover TTG field, where the A duration is determined by the station according to a TXOP held by itself, the TTG field is a third value or a fourth value, the third value is used to indicate that the TXOP is allowed to be handed over, and the fourth value is used to indicate that the handover is not allowed.
  • the station receives a fourth frame or a fifth frame sent by the access point, where the fourth frame carries a second duration, and the second duration is determined by a TXOP requested by the access point, The length of the second duration is greater than the length of the first duration, and the TXOP requested by the access point is obtained by extending a TXOP held by the station by a preset duration, and the fifth frame carries the first duration.
  • An eighth aspect of the present application provides a station, including: a fourth transmitter, configured to send a third frame to an access point, where the third frame carries a first duration and a handover TTG field, where the first duration is Determined by the station according to the TXOP held by the station, the TTG field is a third value or a fourth value, the third value is used to indicate that the TXOP is allowed to be handed over, and the fourth value is used to indicate that the TXOP is not allowed to be handed over; And a fourth receiver, configured to receive a fourth frame or a fifth frame sent by the access point, where the fourth frame carries a second duration, where the second duration is determined by a TXOP requested by the access point The length of the second duration is greater than the length of the first duration, and the TXOP requested by the access point is obtained by extending a TXOP held by the station by a preset duration, and the fifth frame carries the first A Duration.
  • the receiving, by the station, the fourth frame or the fifth frame sent by the access point includes: the TTG field is the third value, and the station receives The fourth frame sent by the access point; or the TTG field is the fourth value, and the station receives the fifth frame sent by the access point.
  • the station sends a third frame to the access point, where the carrying the first duration and the TTG field in the third frame includes:
  • the access point transmits the last frame in the held TXOP, and the last frame carries the first Duration and the TTG field. Carrying the TTG field in the last frame facilitates the STA to complete its own transmission, and the third-party STA is in an awake state when the AP holds the TXOP.
  • the sending, by the station, the third TXOP handover indication includes: sending, by the station, a contention-free period ending CF-End-X frame, the CF-End-X The second duration is carried in the frame, and the CF-End-X frame is used to indicate that the data transmission of the TXOP held by the station is ended.
  • the CF-End-X frame facilitates the determination of TXOP handoffs to avoid transmission failures.
  • FIG. 1 is a schematic diagram of a WLAN deployment scenario
  • FIG. 2 is a flowchart of a transmission opportunity control method according to an embodiment of the present application.
  • 3 is a flow chart of STA accessing a channel and transmitting data in the 802.11 standard
  • FIG. 4 is a schematic diagram of frame interaction of the method shown in FIG. 2;
  • FIG. 5 is a flowchart of still another transmission opportunity control method according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of frame interaction of the method shown in FIG. 5;
  • FIG. 7 is a flowchart of still another transmission opportunity control method according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an access point according to an embodiment of the present application.
  • Figure 1 shows a schematic diagram of a WLAN deployment scenario, in which both the AP and the STA need to become TXOP holders through competition.
  • the purpose of the transmission opportunity control method provided by the embodiment of the present application is to increase the opportunity for the AP to hold the TXOP, so that the AP has more opportunities to schedule each STA, thereby improving resource utilization.
  • FIG. 2 shows a transmission opportunity control method, including the following steps:
  • S201 The AP sends a first frame, where the first frame carries a TXOP Handover Enforcement (THE) indication field.
  • TXOP Handover Enforcement TXOP Handover Enforcement
  • the first frame may be a beacon frame (Beacon).
  • the AP may send a beacon frame carrying the THE indication field to the STA in a Beacon Interval to indicate that the STA in the beacon frame period performs the handover of the TXOP.
  • the value of the THE indication field is a first value or a second value.
  • the first value (for example, 1) is used to indicate that the STA of the access channel forwards the held TXOP to the AP
  • the second value (for example, 0) is used to indicate that the STA of the access channel satisfies the handover condition.
  • the TXOP held is handed over to the AP. That is, the first value indicates that the STA must forward the TXOP, and the second value indicates that the STA determines whether to hand over according to the condition.
  • AP can be based on demand and network conditions
  • the value of the THE indication field is set. For example, if the number of STAs to be accessed is greater than a preset value, and the AP needs to schedule multiple STAs, the AP may set the THE indication field to the first value.
  • the STA After completing the backoff, the STA successfully accesses the channel, and records the length of time from the start of the backoff to the completion of the backoff.
  • the minimum can be 0. If the channel continues to idle more than one aTimeSlot, the backoff window is decremented by one; if the channel is found to be busy, the backoff is suspended until the channel is idle again. When the backoff window is reduced to 0, the competition is successful and the data is sent.
  • DIFS distributed interframe space
  • S203 After receiving the first frame, the STA parses out the value of the THE indication field. If the THE indication field is the first value, S204 is performed, and if the THE indication field is the second value, S205 is performed.
  • S201 must be executed before S202, and the execution order between S201 and S203, S202 and S203 is not limited to the sequence shown in FIG. 2.
  • the STA sends a second frame to the AP, where the second frame is used to indicate that the TXOP is handed over to the AP.
  • S205 The STA determines whether the handover condition is satisfied, if yes, executes S206, and if not, executes S207.
  • the handover condition is that the duration of the STA contending for the channel usage is greater than the handover threshold, where the handover threshold is the duration of the competition provided by the access point for the station for the contention channel, and within the competition duration, each STA may Competitive channel, after this period of time, no longer can compete Road.
  • the handover threshold is the average value of the duration used by the STA to participate in channel competition for the first five times.
  • the AP may determine a handover threshold according to network conditions. For example, the network load, the number of STAs accessed, or the average number of back-off collisions of the stations, etc., can be used as the basis for the AP to determine the handover threshold. Further, the AP may further adjust the value of the handover threshold according to the value of the network state.
  • the handover threshold may be carried in a management frame, a control frame, or a data frame sent by the AP to the STA.
  • the STA sends a second frame to the AP, where the second frame is used to indicate that the TXOP is handed over to the AP.
  • the second frame in this embodiment may be a management frame, a control frame, or a data frame that carries the TXOP handover information, or may be a newly defined frame type that is different from the prior art.
  • the AP acquires the TXOP holding right, and further performs downlink multi-STA data transmission, transmission trigger frame trigger random access, or uplink multi-STA transmission in the TXOP.
  • FIG. 4 is a schematic diagram of a frame interaction of the method shown in FIG. 2, in which, after receiving the second frame, the AP may also feed back an ACK to the STA.
  • the ACK is also in this embodiment. Used to inform STA: AP starts to hold TXOP.
  • the STA can forward the held TXOP to the AP. Therefore, even if the AP does not compete for the channel, the AP can be transferred to the TXOP by the TXOP, so the AP is added. There is a probability of TXOP, which increases the probability of the AP scheduling STA, which is beneficial to improve the resource utilization of the system.
  • FIG. 5 is still another transmission opportunity control method disclosed in the embodiment of the present application.
  • the difference from the method shown in FIG. 4 is that the AP can hold the TXOP2 after the STA completes the holding of the TXOP1, and the new TXOP holds Some can break the limit of the original TXOP length.
  • the method shown in Figure 5 includes the following steps:
  • the STA After the STA successfully accesses the channel, the STA sends a third frame to the AP, where the third frame carries the first Duration and TXOP Transfer Grant (TTG) fields.
  • TAG TXOP Transfer Grant
  • the first duration is determined by the STA according to the TXOP held by itself.
  • the network allocation vector (NAV) is set to the first duration, and the specific setting manner of the NAV can be referred to the prior art, and details are not described herein again.
  • the TTG field is a third value or a fourth value, and the third value (for example, 1) is used to indicate that the TXOP is allowed to be handed over, and the fourth value (for example, 0) is used to indicate that the TXOP is not allowed to be handed over.
  • the STA can set the value of the TTG field according to requirements.
  • the bit size occupied by the TTG field can be determined according to actual requirements. In this embodiment, to save resource overhead, the TTG field is defined as 1 bit.
  • S502 The AP parses the value of the TTG field. If the TTG field is the third value, S503 is performed. If the TTG field is the fourth value, S504 is performed.
  • S503 The AP sends a fourth frame to the STA of the access channel, where the fourth frame carries the second duration, and the length of the second duration is greater than the length of the first duration.
  • the second duration is determined by the TXOP requested by the AP, and the TXOP requested by the AP is obtained by extending the TXOP held by the STA by a preset duration. Specifically, the NAV in the fourth frame is set to the second duration.
  • the AP sends a fifth frame to the STA of the access channel, where the fifth frame carries the first duration.
  • the STA sends a contention free end (CF-End-X) frame to the AP, where the CF-End-X frame carries the second duration.
  • the CF-End-X frame is used to indicate the end of data transmission by the STA during TXOP1.
  • S505 The purpose of S505 is to explicitly inform the AP STA that the transmission of TXOP1 is over, and the AP can start to hold TXOP2, thus facilitating communication collision avoidance.
  • the AP starts to hold the TXOP2, and the third-party device ends the silence, and prepares to cooperate with the scheduling of the AP.
  • the AP in order to ensure that the STA can complete the transmission, and the third-party STA that can identify the TTG field ends the silence at the TXOP2, thereby facilitating the AP to perform scheduling, the AP should extend the TXOP1 to TXOP2 as close as possible to the end of the TXOP1.
  • the Duration setting allows third-party STAs to correctly understand that TXOP2 is extending TXOP1 and thus needs to remain awake in TXOP2. Therefore, as shown in FIG.
  • the STA does not release the resource, but releases the ownership of the TXOP1, and then the AP becomes the holder of the TXOP2, and continues to access the resource. Therefore, the AP does not need to re-competition the channel, thereby improving the possibility that the AP schedules the STA, which is beneficial to improving resource utilization.
  • FIG. 7 shows another transmission opportunity control method disclosed in this embodiment, which includes the following steps:
  • the TXOP1 After the STA successfully contends to the channel, the TXOP1 sends a sixth frame to the AP, and the sixth frame carries the first duration.
  • S702 The AP sends a seventh frame to the STA, where the second frame carries the second duration.
  • the STA sends an eighth frame to the AP, where the eighth frame carries the second Duration and TTG fields, where the TTG field is 1.
  • the STA sends the RTS, and the specific form of the RTS can be referred to the prior art.
  • the AP replies to the CTS, which is different from the CTS defined in the prior art in that the CTS carries the second duration.
  • the method described in this embodiment can improve the resource utilization of the WLAN system.
  • FIG. 9 is a schematic structural diagram of an access point shown in FIG. 2, including: a first transmitter, a first processor, and a first receiver.
  • the first transmitter is configured to send a first frame
  • the first receiver is configured to receive a second frame sent by the station of the access channel
  • the first processor is configured to determine, according to a network condition, a handover threshold to be sent to the station.
  • the specific form of the first frame and the second frame, and the specific function implementation of the access point can be seen in FIG. 2 .
  • the structure of the access point shown in FIG. 5 includes a second receiver, a second transmitter, and a second processor.
  • the second receiver is configured to receive the third frame.
  • the second transmitter is configured to: when the TTG field is the third value, send the fourth frame to the station of the access channel; and if the TTG field is the fourth value, send the first to the station of the access channel. Five frames.
  • the second processor is configured to hold the TXOP requested by the access point after the second transmitter sends the fourth frame to the station of the access channel.
  • the structure of the station shown in FIG. 2 includes a third receiver, a third transmitter, and a third processor.
  • the third receiver is configured to receive the first frame
  • the third transmitter is configured to send the second frame
  • the third processor is configured to implement the determining process and hold the current TXOP.
  • the structure of the station shown in FIG. 5 includes a fourth transmitter and a fourth receiver.
  • the fourth The transmitter is configured to transmit the third frame and the CF-End-X
  • the fourth receiver is configured to receive the fourth frame or the fifth frame.
  • the access point shown in FIG. 7 includes a fifth receiver, a fifth transmitter, and a fifth processor.
  • the fifth receiver is configured to receive the sixth frame and the eighth frame
  • the fifth transmitter is configured to send the seventh frame
  • the fifth processor is configured to hold the TXOP2.
  • the station shown in FIG. 7 includes a sixth transmitter and a sixth receiver, wherein the sixth transmitter is configured to transmit the sixth frame and the eighth frame, and the sixth receiver is configured to receive the seventh frame.
  • the access points and stations shown above can implement the change of the TXOP holder from the site to the access point through frame interaction, thereby improving the probability of the access point scheduling the STA, which is beneficial to improving resource utilization.

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Abstract

本申请提供了一种传输机会控制方法，接入点发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值，所述第一数值用于指示接入信道的站点将持有的TXOP转交给所述接入点，所述第二数值用于指示所述接入信道的站点在满足转交条件的情况下，将持有的TXOP转交给所述接入点，可见STA将持有的TXOP转交给AP，因此，AP即使没有竞争到信道，也可以通过TXOP的转交，成为TXOP持有者，所以，增加了AP持有TXOP的机率，从而增加了AP调度STA的机率，有利于提高系统的资源利用率。

Description

一种传输机会控制方法及装置
本申请要求于2015年12月28日提交中国专利局、申请号为201511003316.7、发明名称为“一种传输机会控制方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种传输机会控制方法及装置。
背景技术
无线局域网(Wireless Local Area Network,WLAN)中的设备需要通过竞争来获得信道资源的使用权，即成为传输机会(Transmission Opportunity，TXOP)持有者。目前，接入点类的站点(Access Point，AP)和非接入点类的站点(None Access Point Station，简称，STA)具有均等的竞争机会。
引入OFDMA技术后的802.11ax中，AP可以在不同的时频资源上对不同的STA进行上下行传输调度，以提高系统的资源利用率。
而当网络接入用户设备比较多的情况下，竞争会比较强烈，AP成功竞争信道的几率也会比较低，如果AP不能成为TXOP持有者，则不能进行多用户调度传输，因此，也就不利于提高资源利用率。
发明内容
本申请提供了一种传输机会控制方法及装置，目的在于提高AP成为 TXOP持有者的机会，以提高WLAN系统的资源利用率。
为了实现上述目的，本申请提供了以下技术方案：
本申请的第一方面提供了一种传输机会控制方法，包括：接入点发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值，所述第一数值用于指示接入信道的站点将持有的TXOP转交给所述接入点，所述第二数值用于指示所述接入信道的站点在满足转交条件的情况下，将持有的TXOP转交给所述接入点。第一方面所述的方法，STA将TXOP转交给AP，增加了AP调度STA的机率，从而有利于提高资源的利用率。
本申请的第二方面提供了一种接入点，包括：第一发送器，用于发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值，所述第一数值用于指示接入信道的站点将持有的TXOP转交给所述接入点，所述第二数值用于指示所述接入信道的站点在满足转交条件的情况下，将持有的TXOP转交给所述接入点。
在第一方面和第二方面的一种实现方式中，所述THE指示字段为所述第一数值，或者所述THE指示字段为所述第二数值且所述接入信道的站点满足所述转交条件；还包括：所述接入点接收所述接入信道的站点发送的第二帧，所述第二帧用于指示将所述TXOP转交给所述接入点。
在第一方面和第二方面的另一种实现方式中，所述转交条件包括：所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长；所述转交门限由所述接入点依据网络状况确定并向所述站点发送。
本申请的第三方面提供了一种传输机会控制方法，包括：接入点接收第三帧，所述第三帧中携带第一Duration和TXOP转移许可TTG字段，所述第一Duration由所述接入信道的站点依据自身持有的TXOP确定；在所述TTG字段为第三数值的情况下，所述接入点向接入信道的站点发送第四帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得。第三方面提供的方法，在STA持有的TXOP1完成传输后，AP可以持有TXOP2，从而有利于提高资源的利用率。
本申请的第四方面提供了一种接入点，包括：第二接收器，用于接收第三帧，所述第三帧中携带第一Duration和TXOP转移许可TTG字段，所述第一Duration由所述接入信道的站点依据自身持有的TXOP确定；以及第二发送器，用于在所述TTG字段为第三数值的情况下，向接入信道的站点发送第四帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得。
在第三方面及第四方面的一种实现方式中，还包括：在所述TTG字段为第四数值的情况下，所述接入点发送第五帧，所述第五帧中携带所述第一Duration。
在第三方面及第四方面的一种实现方式中，在所述接入点向接入信道的站点发送第四帧后，还包括：所述接入点持有所述接入点请求的TXOP。
在第三方面及第四方面的一种实现方式中，在所述接入点向接入信道的站点发送第四帧后，还包括：所述接入点接收所述接入信道的站点发送的无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述接入信道的站点在所述第一Duration期间的数据传输结束；所述接入点持有所述接入点请求的TXOP。
本申请的第五方面提供了一种传输机会控制方法，包括：站点接收接入点发送的第一帧，所述第一帧中携带TXOP转交强制THE指示字段；在所述THE指示字段为第一数值的情况下，所述站点向所述接入点发送第二帧，所述第二帧信息用于指示将所述TXOP转交给所述接入点。
本申请的第六方面提供了一种站点，包括：第三接收器，用于接收接入点发送的第一帧，所述第一帧中携带TXOP转交强制THE指示字段；以及第三发送器，用于在所述THE指示字段为第一数值的情况下，向所述接入点发送第二帧，所述第二帧信息用于指示将所述TXOP转交给所述接入点。
在第五方面及第六方面的一种实现方式中，还包括：在所述THE指示字段为第二数值的情况下，所述站点判断是否满足转交条件，如果满足所述转交条件，所述站点向所述接入点发送所述TXOP转交帧。
在第五方面及第六方面的一种实现方式中，所述转交条件包括：
所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长。
本申请的第七方面提供了一种传输机会控制方法，包括：站点向接入点发送第三帧，所述第三帧中携带第一Duration和转交TTG字段，所述第 一Duration由所述站点依据自身持有的TXOP确定，所述TTG字段为第三数值或者第四数值，所述第三数值用于指示允许转交TXOP，所述第四数值用于指示不允许转交TXOP；所述站点接收所述接入点发送的第四帧或者第五帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得，所述第五帧中携带所述第一Duration。
本申请的第八方面提供了一种站点，包括：第四发送器，用于向接入点发送第三帧，所述第三帧中携带第一Duration和转交TTG字段，所述第一Duration由所述站点依据自身持有的TXOP确定，所述TTG字段为第三数值或者第四数值，所述第三数值用于指示允许转交TXOP，所述第四数值用于指示不允许转交TXOP；以及第四接收器，用于接收所述接入点发送的第四帧或者第五帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得，所述第五帧中携带所述第一Duration。
在第七方面及第八方面的一种实现方式中，所述站点接收所述接入点发送的第四帧或者第五帧包括：所述TTG字段为所述第三数值，所述站点接收所述接入点发送的所述第四帧；或者，所述TTG字段为所述第四数值，所述站点接收所述接入点发送的所述第五帧。
在第七方面及第八方面的一种实现方式中，所述站点向接入点发送第三帧，所述第三帧中携带第一Duration和TTG字段包括：所述站点向所述 接入点发送持有的TXOP中的所述最后一个帧，所述最后一个帧中携带所述第一Duration和所述TTG字段。将TTG字段携带在最后一个帧中，有利于STA完成自身的传输，并且，第三方STA在AP持有TXOP时处于清醒状态。
在第七方面及第八方面的一种实现方式中，所述站点发送所述第三TXOP转交指示包括：所述站点发送无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述站点在自身持有的TXOP的数据传输结束。CF-End-X帧有利于TXOP转交的确定，从而避免出现传输故障。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为WLAN部署场景的示意图；
图2为本申请实施例公开的一种传输机会控制方法的流程图；
图3为802.11标准中STA接入信道并发送数据的流程图；
图4为图2所示方法的帧交互示意图；
图5为本申请实施例公开的又一种传输机会控制方法的流程图；
图6为图5所示方法的帧交互示意图；
图7为本申请实施例公开的又一种传输机会控制方法的流程图；
图8所示方法的帧交互示意图；
图9为本申请实施例公开的一种接入点的结构示意图。
具体实施方式
图1所示为WLAN部署场景的示意图，其中，AP和STA均需要通过竞争成为TXOP持有者。本申请实施例提供的传输机会控制方法的目的在于，增加AP持有TXOP的机会，使得AP有更多机会调度各个STA，从而提高资源利用率。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
图2所示为一种传输机会控制方法，包括以下步骤：
S201：AP发送第一帧，第一帧中携带TXOP转交强制(TXOP Handover Enforcement，THE)指示字段。
具体地，第一帧可以为信标帧(Beacon)。进一步地，AP可以在一个信标帧周期(Beacon Interval)内，向STA发送携带THE指示字段的信标帧，用于指示在此信标帧周期的STA进行TXOP的转交。
具体地，THE指示字段的值为第一数值或第二数值。其中，第一数值(例如1)用于指示接入信道的STA将持有的TXOP转交给AP，第二数值(例如0)用于指示接入信道的STA在满足转交条件的情况下，将持有的TXOP转交给AP。也就是说，第一数值指示STA必须转交TXOP，而第二数值指示STA依据条件判断是否转交。AP可以依据需求及网络状况 设置THE指示字段的值，例如，如果接入的STA数量大于预设数值，AP需要对多个STA进行调度，则AP可以将THE指示字段设置为第一数值。
S202：STA完成退避后成功接入信道，并记录从退避开始至退避完成所使用的时长。
图3为现有的802.11标准系列中，STA通过侦听信道，开始退避至退避完成接入信道并发送数据的流程图。具体地，STA持续侦听信道为空闲状态达到分布式帧间间隔(Distributed Inter Frame Space，DIFS)(DIFS＝34us)后，开始随机退避，STA随意选择一个退避窗口，所述退避窗口为整数倍的基本时间窗口aTimeSlot(aTimeSlot＝9us)，最小可以为0。如果信道持续空闲超过一个aTimeSlot，则退避窗口减一；如果发现信道繁忙，则暂停退避直至信道再次空闲。当退避窗口减至0时，竞争成功并发送数据。
S203：STA接收到第一帧后，解析出THE指示字段的值，如果THE指示字段为第一数值，执行S204，如果THE指示字段为第二数值，执行S205。
需要说明的是，本实施例中S201一定在S202之前执行，而S201与S203、S202与S203之间的执行顺序并不限定在图2所示的顺序。
S204：STA向AP发送第二帧，第二帧用于指示将TXOP转交给AP。
S205：STA判断是否满足转交条件，如果是，执行S206，如果否，执行S207。
具体地，转交条件为STA竞争到信道使用的时长大于转交门限，其中，转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长，在这个竞争时长内，各个STA可以竞争信道，超出这个时长后，不能再竞争信 道。举例说明，转交门限为STA前五次参与信道竞争所使用的时长的平均数值。
具体地，AP可以依据网络状况确定转交门限。例如，网络负载量、接入的STA的数量、或者站点的平均退避碰撞次数等，均可作为AP确定转交门限的依据。进一步地，AP还可以根据上述网络状态的数值，调整转交门限的值。
具体地，转交门限可以被携带在由AP发给STA的管理帧、控制帧或者数据帧中。
S206：STA向AP发送第二帧，第二帧用于指示将TXOP转交给AP。
具体地，本实施例中所述的第二帧可以为携带TXOP转交信息的管理帧、控制帧或者数据帧，也可以为区别与现有技术的、新定义的帧类型。
S207：STA继续持有当前的TXOP。
S208：AP获取TXOP持有权，进而在TXOP进行下行多STA数据传输、发送触发帧触发随机接入或者上行多STA传输等。
图4为图2所示方法的帧交互示意图，其中，在AP接收到第二帧后，还可以向STA反馈ACK，ACK除了具有现有技术中已经定义的功能外，本实施例中，还用于告知STA：AP开始持有TXOP。
可见，本实施例中所述的方法，STA能够将持有的TXOP转交给AP，因此，AP即使没有竞争到信道，也可以通过TXOP的转交，成为TXOP持有者，所以，增加了AP持有TXOP的机率，从而增加了AP调度STA的机率，有利于提高系统的资源利用率。
图5为本申请实施例公开的又一种传输机会控制方法，与图4所示的方法的区别在于，AP在STA完成对TXOP1的持有后，能够持有TXOP2，并且，新的TXOP持有者可以突破原有TXOP长度的限制。
图5所示的方法包括以下步骤：
S501：STA成功接入信道后，STA向AP发送第三帧，第三帧中携带第一Duration和TXOP转移许可(TXOP Transfer Grant，TTG)字段。
其中，第一Duration由STA依据自身持有的TXOP确定。具体地，在第三帧中，将网络分配向量(Network Allocation Vector，NAV)设置为第一Duration，NAV的具体设置方式可以参见现有技术，这里不再赘述。
具体地，TTG字段为第三数值或者第四数值，第三数值(例如1)用于指示允许转交TXOP，所述第四数值(例如0)用于指示不允许转交TXOP。STA可以依据需求设置TTG字段的值。TTG字段占用的比特大小可以依据实际需求确定，本实施例中，为了节省资源开销，定义TTG字段为1比特。
S502：AP解析TTG字段的值，如果TTG字段为第三数值，执行S503，如果TTG字段为第四数值，执行S504。
S503：AP向接入信道的STA发送第四帧，第四帧中携带第二Duration，第二Duration的长度大于第一Duration的长度。
其中，第二Duration由AP请求的TXOP确定，AP请求的TXOP通过将STA持有的TXOP延长预设时长获得。具体地，第四帧中的NAV设置为第二Duration。
S504：AP向接入信道的STA发送第五帧，第五帧中携带第一Duration。
S505：STA向AP发送无竞争周期结束(Contention Free End，CF-End-X)帧，所述CF-End-X帧中携带第二Duration。CF-End-X帧用于指示STA在TXOP1期间的数据传输结束。
S505的目的在于，明确告知AP STA在TXOP1的传输结束，AP可以开始持有TXOP2，因此，有利于避免通信冲突。
S506：AP持有请求的TXOP2。
S507(图5中未画出)：对于能够识别TTG字段的第三方设备(例如其它STA)监听到AP与所述STA之间交互的帧，在未监听到携带TTG＝1的帧之前，按照较长的Duration设置自身的NAV，从而使得第三方设备在NAV对应的Duration保持静默。一旦监听到携带TTG＝1的帧，说明AP开始持有TXOP2，则第三方设备结束静默，准备配合AP的调度。
对于不能识别TTG字段的第三方设备，则直接按照较长的Duration设置自身的NAV。
基于上述过程进行举例说明：如图6所示，STA成功接入信道后，在TXOP1中，向AP发送控制帧、数据帧或者管理帧，其中，TTG＝1可以携带在以上任一个帧中。可选地，为了保证STA能够完成传输，并且使得能够识别TTG字段的第三方STA在TXOP2结束静默，从而有利于AP进行调度，AP应尽可能地在靠近TXOP1结束的时刻来进行延长TXOP1至TXOP2的Duration设置，让第三方STA正确地理解TXOP2是在延长TXOP1，从而需要在TXOP2保持清醒状态。因此，如图6所示，将TTG＝1携带在STA向AP发送的最后一个帧中(深色Data)，即在STA向AP发送的最后一个帧中，TTG字段的值为1，且NAV为第二Duration。而在 STA向AP发送的其它的帧中，TTG＝0，或者携带TTG字段，并且NAV为第一Duration。
如果AP接收到的帧中TTG＝0，则AP按照现有标准的规定向STA发送反馈帧，例如接收到RTS后反馈CTS，其中NAV为第一Duration。如果AP接收到的帧中TTG＝1，AP向STA反馈的帧中的NAV为第二Duration。在反馈携带第二Duration的帧后，AP持有TXOP2。其中AP可以依据自身及整个BSS的情况确定TXOP2的长度。
可见，本实施例所述方法，在STA在TXOP1中完成传输后，不进行资源的释放，而是释放TXOP1的持有权，继而AP成为TXOP2的持有者，持续对所述资源的接入，使得AP无需重新竞争信道，从而能够提高AP调度STA的可能性，有利于提高资源利用率。
图7所示为本实施例公开的又一种传输机会控制方法，包括以下步骤：
S701：STA成功竞争到信道后，在TXOP1向AP发送第六帧，第六帧中携带第一Duration。
S702：AP向STA发送第七帧，第七帧中携带第二Duration。
S703：STA向AP发送第八帧，第八帧中携带第二Duration和TTG字段，其中TTG字段为1。
S704：AP持有TXOP2。
举例说明，如图8所示，STA发送RTS，RTS可以的具体形式可以参见现有技术。AP回复CTS，与现有技术中定义的CTS的不同之处在于，CTS中携带第二Duration。在STA发送的最后一个Data中，携带TTG＝1， 则AP开始持有TXOP2。
本实施例所述的方法，能够提高WLAN系统的资源利用率。
图9为图2中所示的接入点的结构示意图，包括：第一发送器、第一处理器和第一接收器。
其中，第一发送器用于发送第一帧，第一接收器用于接收所述接入信道的站点发送的第二帧，第一处理器用于依据网络状况确定并向所述站点发送转交门限。其中，第一帧及第二帧的具体形式、接入点的具体功能实现等均可参见图2所示。
图5中所示接入点的结构包括第二接收器、第二发送器和第二处理器。其中，第二接收器用于接收第三帧。第二发送器用于在所述TTG字段为第三数值的情况下，向接入信道的站点发送第四帧以及在所述TTG字段为第四数值的情况下，向接入信道的站点发送第五帧。第二处理器用于在所述第二发送器向所述接入信道的站点发送所述第四帧后，持有所述接入点请求的TXOP。
本实施例中，第三帧、第四帧及第五帧的具体形式以及接入点的功能的实现流程可以参见图5所示，这里不再赘述。
图2所示的站点的结构包括第三接收器、第三发送器以及第三处理器。其中，第三接收器用于接收第一帧，第三发送器用于发送第二帧，第三处理器用于实现判断过程以及持有当前的TXOP。
图5所示的站点的结构包括第四发送器以及第四接收器。其中，第四 发送器用于发送第三帧及CF-End-X，第四接收器用于接收第四帧或第五帧。
图7中所示的接入点包括第五接收器、第五发送器和第五处理器。其中，第五接收器用于接收第六帧和第八帧，第五发送器用于发送第七帧，第五处理器用于持有TXOP2。图7所示的站点包括：第六发送器和第六接收器，其中，第六发送器用于发送第六帧和第八帧，第六接收器用于接收第七帧。
以上所示接入点和站点，可以通过帧交互实现TXOP的持有者从站点到接入点的变更，从而提高接入点调度STA的几率，有利于提高资源的利用率。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同或相似部分互相参见即可。

Claims (28)

  1. 一种传输机会控制方法，其特征在于，包括：
    接入点发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值，所述第一数值用于指示接入信道的站点将持有的TXOP转交给所述接入点，所述第二数值用于指示所述接入信道的站点在满足转交条件的情况下，将持有的TXOP转交给所述接入点。
  2. 根据权利要求1所述的方法，其特征在于，所述THE指示字段为所述第一数值，或者所述THE指示字段为所述第二数值且所述接入信道的站点满足所述转交条件；
    所述方法还包括：
    所述接入点接收所述接入信道的站点发送的第二帧，所述第二帧用于指示将所述TXOP转交给所述接入点。
  3. 根据权利要求1或2所述的方法，其特征在于，所述转交条件包括：
    所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长；
    所述方法还包括：
    所述接入点依据网络状况确定并向所述站点发送所述转交门限。
  4. 一种传输机会控制方法，其特征在于，包括：
    接入点接收第三帧，所述第三帧中携带第一Duration和TXOP转移许可TTG字段，所述第一Duration由所述接入信道的站点依据自身持有的TXOP确定；
    在所述TTG字段为第三数值的情况下，所述接入点向接入信道的站点发送第四帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得。
  5. 根据权利要求4所述的方法，其特征在于，还包括：
    在所述TTG字段为第四数值的情况下，所述接入点发送第五帧，所述 第五帧中携带所述第一Duration。
  6. 根据权利要求4或5所述的方法，其特征在于，在所述接入点向接入信道的站点发送第四帧后，还包括：
    所述接入点持有所述接入点请求的TXOP。
  7. 根据权利要求4或5所述的方法，其特征在于，在所述接入点向接入信道的站点发送第四帧后，还包括：
    所述接入点接收所述接入信道的站点发送的无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述接入信道的站点在所述第一Duration期间的数据传输结束；
    所述接入点持有所述接入点请求的TXOP。
  8. 一种传输机会控制方法，其特征在于，包括：
    站点接收接入点发送的第一帧，所述第一帧中携带TXOP转交强制THE指示字段；
    在所述THE指示字段为第一数值的情况下，所述站点向所述接入点发送第二帧，所述第二帧信息用于指示将所述TXOP转交给所述接入点。
  9. 根据权利要求8所述的方法，其特征在于，还包括：
    在所述THE指示字段为第二数值的情况下，所述站点判断是否满足转交条件，如果满足所述转交条件，所述站点向所述接入点发送所述TXOP转交帧。
  10. 根据权利要求9所述的方法，其特征在于，所述转交条件包括：
    所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长。
  11. 一种传输机会控制方法，其特征在于，包括：
    站点向接入点发送第三帧，所述第三帧中携带第一Duration和转交TTG字段，所述第一Duration由所述站点依据自身持有的TXOP确定，所述TTG字段为第三数值或者第四数值，所述第三数值用于指示允许转交TXOP，所述第四数值用于指示不允许转交TXOP；
    所述站点接收所述接入点发送的第四帧或者第五帧，所述第四帧中携 带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得，所述第五帧中携带所述第一Duration。
  12. 根据权利要求11所述的方法，其特征在于，所述站点接收所述接入点发送的第四帧或者第五帧包括：
    所述TTG字段为所述第三数值，所述站点接收所述接入点发送的所述第四帧；
    或者，所述TTG字段为所述第四数值，所述站点接收所述接入点发送的所述第五帧。
  13. 根据权利要求11或12所述的方法，其特征在于，所述站点向接入点发送第三帧，所述第三帧中携带第一Duration和TTG字段包括：
    所述站点向所述接入点发送持有的TXOP中的所述最后一个帧，所述最后一个帧中携带所述第一Duration和所述TTG字段。
  14. 根据权利要求11或12所述的方法，其特征在于，所述站点发送所述第三TXOP转交指示包括：
    所述站点发送无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述站点在自身持有的TXOP的数据传输结束。
  15. 一种接入点，其特征在于，包括：
    第一发送器，用于发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值，所述第一数值用于指示接入信道的站点将持有的TXOP转交给所述接入点，所述第二数值用于指示所述接入信道的站点在满足转交条件的情况下，将持有的TXOP转交给所述接入点。
  16. 根据权利要求15所述的接入点，其特征在于，所述第一发送器用于发送第一帧，所述第一帧中携带TXOP转交强制THE指示字段，所述THE指示字段为第一数值或第二数值包括：
    所述第一发送器具体用于，发送第一帧，所述THE指示字段为所述第 一数值，或者所述THE指示字段为所述第二数值且所述接入信道的站点满足所述转交条件；
    还包括：
    第一接收器，用于接收所述接入信道的站点发送的第二帧，所述第二帧用于指示将所述TXOP转交给所述接入点。
  17. 根据权利要求15或16所述的接入点，其特征在于，所述转交条件包括：
    所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长；
    还包括：
    第一处理器，用于依据网络状况确定并向所述站点发送所述转交门限。
  18. 一种接入点，其特征在于，包括：
    第二接收器，用于接收第三帧，所述第三帧中携带第一Duration和TXOP转移许可TTG字段，所述第一Duration由所述接入信道的站点依据自身持有的TXOP确定；
    第二发送器，用于在所述TTG字段为第三数值的情况下，向接入信道的站点发送第四帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入点请求的TXOP为将所述站点持有的TXOP延长预设时长获得。
  19. 根据权利要求18所述的接入点，其特征在于，所述第二发送器还用于：
    在所述TTG字段为第四数值的情况下，向所述接入信道的站点发送第五帧，所述第五帧中携带所述第一Duration。
  20. 根据权利要求18或19所述的接入点，其特征在于，还包括：
    第二处理器，用于在所述第二发送器向所述接入信道的站点发送所述第四帧后，持有所述接入点请求的TXOP。
  21. 根据权利要求18或19所述的接入点，其特征在于，所述第二接收器还用于：
    在所述第二发送器向所述接入信道的站点发送所述第四帧后，接收所述接入信道的站点发送的无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述接入信道的站点在所述第一Duration期间的数据传输结束；
    还包括：
    第二处理器，用于持有所述接入点请求的TXOP。
  22. 一种站点，其特征在于，包括：
    第三接收器，用于接收接入点发送的第一帧，所述第一帧中携带TXOP转交强制THE指示字段；
    第三发送器，用于在所述THE指示字段为第一数值的情况下，向所述接入点发送第二帧，所述第二帧信息用于指示将所述TXOP转交给所述接入点。
  23. 根据权利要求22所述的站点，其特征在于，还包括：
    第三处理器，用于在所述THE指示字段为第二数值的情况下，判断是否满足转交条件，如果满足所述转交条件，所述站点向所述接入点发送所述TXOP转交帧。
  24. 根据权利要求22或23所述的站点，其特征在于，所述第三处理器用于判断是否满足转交条件包括：
    所述第三处理器具体用于，判断所述站点竞争到所述信道使用的时长大于转交门限，所述转交门限为所述接入点为所述站点提供的用于竞争信道的竞争时长。
  25. 一种站点，其特征在于，包括：
    第四发送器，用于向接入点发送第三帧，所述第三帧中携带第一Duration和转交TTG字段，所述第一Duration由所述站点依据自身持有的TXOP确定，所述TTG字段为第三数值或者第四数值，所述第三数值用于指示允许转交TXOP，所述第四数值用于指示不允许转交TXOP；
    第四接收器，用于接收所述接入点发送的第四帧或者第五帧，所述第四帧中携带第二Duration，所述第二Duration由所述接入点请求的TXOP确定，所述第二Duration的长度大于所述第一Duration的长度，所述接入 点请求的TXOP为将所述站点持有的TXOP延长预设时长获得，所述第五帧中携带所述第一Duration。
  26. 根据权利要求25所述的站点，其特征在于，所述第四接收器用于接收所述接入点发送的第四帧或者第五帧包括：
    所述第四接收器具体用于，所述TTG字段为所述第三数值，接收所述接入点发送的所述第四帧；所述TTG字段为所述第四数值，接收所述接入点发送的所述第五帧。
  27. 根据权利要求25或26所述的站点，其特征在于，所述第四发送器用于向接入点发送第三帧，所述第三帧中携带第一Duration和TTG字段包括：
    所述第四发送器具体用于，向所述接入点发送持有的TXOP中的所述最后一个帧，所述最后一个帧中携带所述第一Duration和所述TTG字段。
  28. 根据权利要求25或26所述的站点，其特征在于，所述第四发送器用于所述第三TXOP转交指示包括：
    所述第四发送器具体用于，发送无竞争周期结束CF-End-X帧，所述CF-End-X帧中携带所述第二Duration，所述CF-End-X帧用于指示所述站点在自身持有的TXOP的数据传输结束。
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US10638384B2 (en) 2020-04-28
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EP3383122A1 (en) 2018-10-03
US11683732B2 (en) 2023-06-20
CN106922035B (zh) 2019-04-16
CN106922035A (zh) 2017-07-04
US20180310211A1 (en) 2018-10-25
US20200236597A1 (en) 2020-07-23
EP4195859B1 (en) 2024-07-31
EP4195859A1 (en) 2023-06-14
EP3383122A4 (en) 2018-11-14
EP3761748A1 (en) 2021-01-06

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