• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    METHOD AND DEVICE FOR TRANSMISSION OF REVERSE DIRECTION PROTOCOL IN WIRELESS LOCAL AREA NETWORK. Embodiments of the present invention relate to communication technologies, in particular to a method and apparatus for transmitting protocol in a wireless local area network. A method for transmitting data from multiple users in a reverse direction protocol according to an embodiment of the present invention includes: within a TXOP transmission opportunity from a first station, if the TXOP has not ended after the first station has finished sending data to an AP access point, obtain, by the AP, the TXOP, where the AP obtainment of the TXOP is implemented by guaranteeing a remaining part of the TXOP to the AP access point by the first station, as an initiator of reverse direction protocol, and within the TXOP, send, by the AP, second data to at least two stations, wherein the at least two stations include the first station.
    公开号:BR112013033147B1
    申请号:R112013033147-0
    申请日:2012-03-26
    公开日:2022-02-01
    发明作者:Lvxi Yang；Hao Li；Chunguo Li；Tianyu Wu
    申请人:Huawei Technologies Co., Ltd；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    Embodiments of the present invention relate to communication technologies and, in particular, to a method and apparatus for transmitting protocol in a wireless local area network. FUNDAMENTALS
    At this time, a transmission opportunity mechanism (TXOP, transmission opportunity) is supported in a wireless local area network, where upon obtaining a transmission opportunity, a station (STA, station) can reserve a period of time during the which one or several data frames can be transmitted continuously. The station obtaining the transmission opportunity is called a transmission opportunity holder (TXOP holder). A NAV (network allocation vector) is defined at a station of a receiver of data sent by a non-transmission opportunity holder, so as to ensure that the non-transmission opportunity holder does not contend within a time slot reserved by the transmission opportunity holder.
    However, in a specific application, an asymmetric uplink and downlink data traffic problem usually occurs in the wireless local area network, i.e. data traffic in one link direction is much heavier than in the wireless local area network. another link direction. In order to solve the problem, a reverse direction protocol mechanism (reverse direction protocol, RD) is supported in a current standard, which refers to that: when a station (which is assumed to be STA-a), obtains, for contending, a transmit opportunity (TXOP) of a certain period of time, if there is time remaining after the station has finished sending data to another station (supposedly STA-b), may grant the right to use a channel for STA-b , and STA-b sends data to a STA-a by using the remaining TXOP time, and returns the transmit possibility to STA-a after finishing sending. STA-a is called a reverse direction protocol RD initiator, while STA-b is called a reverse direction protocol RD responder.
    With the development of technologies, a multi-user transmission (e.g. Multi-User Multiple Input and Multiple Output technology, MU-MIMO) is introduced, i.e. one station sends data simultaneously to two or more than two stations on the same frequency range. In MU-MIMO technology, channel orthogonality between users is mainly used, channel utilization is improved, and system productivity is increased. However, a current reverse direction protocol engine cannot transmit MU-MIMO data. Therefore, the ability of an AP access point to send MU-MIMO data is limited, channel utilization is reduced, which is bad for improving system throughput. SUMMARY
    Embodiments of the present invention provide a method for transmitting data from multiple users in a reverse direction protocol, which can further improve channel utilization when a case of asymmetric uplink and downlink data traffic exists in a network. .
    A method for transmitting data from multiple users in a reverse direction protocol according to an embodiment of the present invention includes: within a TXOP transmission opportunity from a first station, if the TXOP has not ended after the first station has finished sending data to an access point AP, obtain by the AP the TXOP, where the obtainment by the AP of the TXOP is implemented by granting a remaining part of the TXOP to the access point AP by the first station as an initiator of reverse direction protocol, within the TXOP, to send, by the AP, second data to at least two stations, where the at least two stations include the first station.
    In addition, an embodiment of the present invention provides an access point, including: a TXOP acquisition unit configured to: within a TXOP transmission opportunity from a first station, if the TXOP has not ended after the first station has finished sending data to an AP access point, obtain the TXOP, when the AP's acquisition of the TXOP is implemented by granting a remaining portion of the TXOP to the AP access point by the first station as a reverse direction protocol initiator, and a sending unit configured to send second data to at least two stations within the TXOP when the at least two stations include the first station.
    In embodiments of the present invention, the TXOP from the STA is transferred to the AP via the reverse direction protocol within the uplink TXOP time, so that data can be sent to multiple stations using a multi-user transmission capability of the STA. AP, thereby improving channel utilization, increasing the flexibility of the reverse direction protocol, providing a new method to solve a contradiction of uplink and asymmetric downlink traffic, and further improve the overall system throughput. BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a flowchart of a method for transmitting data from multiple users in a reverse direction protocol according to an embodiment of the present invention;
    Figure 2 is a schematic diagram of sending time slots for transmitting data from multiple users in a reverse direction protocol according to an embodiment of the present invention; and
    Figure 3 is a structural schematic diagram of a wireless communication device in accordance with an embodiment of the present invention. DESCRIPTION OF MODALITIES
    In a wireless local area network, each access point AP or STA station contends for a channel, and an AP or STA obtaining a channel per contender is a TXOP holder, whereas failure to obtain a channel per contender is a non-TXOP holder. In embodiments of the present invention, a reverse direction protocol at the MAC layer of a wireless local area network is combined with MU-MIMO to improve channel utilization.
    In a specific application, embodiments of the present invention may be implemented by either an AP or a
    STA on the wireless local area network. In one embodiment of the present invention, a first STA station (STA1) obtains a transmission opportunity (TXOP). Within this TXOP, the STA, after the STA finishes sending data to an AP, STA1 is used as a reverse direction protocol initiator to grant the TXOP to the AP access point.
    Figure 1 is a flowchart of a method according to an embodiment of the present invention. A method for transmitting data from multiple users (e.g. MU-MIMO) in a reverse direction protocol includes: S101: Within a TXOP transmission opportunity from a first station, if the TXOP has not ended after the first station ends sending data to an AP access point, the first station, as a reverse direction protocol initiator, grants a remaining portion of the TXOP to the AP access point.
    In this step, first data can be considered all data that must be sent to the AP by the first station in the TXOP. When the first station finishes sending the data, if the TXOP has not finished, the TXOP is transferred to the AP. When the transmission is finished, the first station STA1 sets an RDG / Plus PPDU bit to 1 in a last frame to indicate that a remaining TXOP is granted to a transmission object. S103: Within the TXOP, the AP sends second data to at least two stations, where the at least two stations include the first station.
    When the AP selects a multi-user group to send the second data, the user group must include the first station. When a user group multiplexing technology is applied to the selected user group, the first station has to be included in a selected user group multiplexing mode. In an application, in this step, the AP sends data to several users after obtaining the TXOP.
    Furthermore, after receiving the data from multiple users, the target station of the AP sends confirmation information about receiving the data to the AP, the access point receives the confirmation information after the first station receives the second data; and the target station may not send the acknowledgment information as long as the AP guarantees the successful sending of data.
    In the embodiment of the present invention, the TXOP of the STA is transferred to the access point via the reverse direction protocol within the uplink TXOP time, so that data can be sent to multiple stations using a multi-user transmission capability. of the AP, thereby improving channel utilization, increasing the flexibility of the reverse direction protocol, providing a new method to solve a contradiction of uplink and asymmetric downlink traffic, and further improve the overall throughput of the system.
    Furthermore, with reference to Figure 2, which is a schematic diagram of sending time slots, another embodiment of the present invention is described.
    The first STA1 station of a user obtains a TXOP, and sends the data to an AP. After all the data that needs to be sent to the AP by the first station STA1 is completely sent, and after the first station STA1 grants a channel to the AP, the TXOP is transferred to the AP.
    After the first user station STA1 grants the channel (transmission opportunity) to the AP, the AP can simultaneously send data to multiple users (eg STA1 and STA2) using the right to use the channel. Here, the data sent by the AP must include the data sent to the first station STA1. That is, the AP, as a reverse-direction protocol responder, needs to send data to a protocol initiator.
    Also, after the AP finishes sending the data from multiple users, if an entire TXOP has not finished, the AP needs to return the right to use the channel to the first station (STA1), a reverse direction protocol initiator. The way to return the right to use the channel is to finally send a Block Confirmation Request (BAR) signal to STA1; a reverse direction grant / plus physical layer protocol data unit (RDG / Plus PPDU) bit in a block acknowledgment request is set to 0, indicating that no more data needs to be sent, after receiving the request signal block acknowledgment, STA1 responds to the acknowledgment signal and takes back the right to use the channel. In a more preferred implementation way, before the AP returns a right to use the TXOP, the AP has to confirm that all target STAs except STA1 have sent an acknowledgment frame such as an ACK or a block acknowledgment BA frame to the AP.
    Furthermore, in the previous embodiment, a remaining part of the TXOP can be returned to the first station STA1, so that the TXOP is fully utilized, thus further improving channel utilization and 8/9 increasing the throughput of the system.
    Furthermore, an embodiment of the present invention further provides an apparatus for implementing the above method. In a specific application, the device may be an AP or an STA on a wireless local area network. Generally, the AP in the wireless local area network is considered to be a special STA. In the modality, the AP is able to implement and complete all the processes and steps of the previous method. The AP has physical or logical modules to fulfill all previous functions and processes.
    Figure 3 is a structural schematic diagram of a wireless communication device in accordance with an embodiment of the present invention. An access point 30 includes: a TXOP acquisition unit 301, configured to: within a TXOP transmission opportunity from a first station, if the TXOP has not ended after the first station has finished sending data to the access point AP, get TXOP, where the AP get the TXOP is implemented by granting a remaining portion of the TXOP to the AP access point by the first station as a reverse direction protocol initiator, and a sending unit 303, configured to send second data to at least two stations within the TXOP, where the at least two stations include the first station.
    Also, if the TXOP has not finished after the AP has finished sending the second data within the TXOP, the sending unit may send more than one BAR block confirmation request to the first station when the block confirmation request is used. to return the TXOP to the first station.
    One way of implementation can be that the block acknowledgment request includes a plus physical layer data unit plus PPDU bit which is set to 0. In this embodiment, the TXOP can be taken back not according to a time condition PIFS channel idle.
    In the embodiment of the present invention, the TXOP from the STA is transferred to the Ap via a reverse direction protocol at the time of uplink TXOP, so that data can be sent to multiple stations using a multi-user transmission capability. of the AP, thereby improving channel utilization, increasing the flexibility of the reverse direction protocol, providing a new method to solve a contradiction of uplink and asymmetric downlink traffic, and further improve the overall throughput of the system.
    Persons of ordinary skill in the art can understand that all or part of the steps of the above method embodiments can be implemented by a relevant instructional program, the program can be stored on a computer readable storage medium, and when the program is executed, the steps of the above method embodiments are performed, and the storage medium can be any medium capable of storing program code, such as a ROM, a RAM, a magnetic disk or an optical disk.
    权利要求:
    Claims (9)
    [0001]
    1. Method for transmitting data from multiple users in a reverse direction protocol, characterized in that it comprises: within a transmission opportunity, TXOP, from a first station, if the TXOP has not ended after the first station has finished sending data to an AP access point, obtain (S101) by the AP the TXOP, wherein the AP obtain the TXOP is implemented by granting a remaining portion of the TXOP to the AP by the first station as an initiator of reverse direction protocol, within the TXOP, to send (S103) by the AP data to at least two stations simultaneously, wherein the at least two stations include the first station, wherein the AP is a reverse direction protocol responder.
    [0002]
    2. Method, according to claim 1, characterized in that it further comprises: if the TXOP has not ended after the AP has finished sending second data to at least two stations, return, by the AP, the TXOP to the first station .
    [0003]
    3. Method, according to claim 1 or 2, characterized in that it further comprises: if the TXOP has not ended after the AP has finished sending the data within the TXOP, send, by the AP, a request for block confirmation, BAR, for the first station, where the block confirmation request is used by the AP to return the TXOP to the first station.
    [0004]
    4. Method, according to claim 2 or 3, characterized in that the return, by the AP, of the TXOP to the first station comprises: receiving, by the AP, one or more acknowledgments, ACKs or block acknowledgment frames, BA, where all ACKs or block acknowledgment frames, BAconfirm, by the AP, that the one or more ACK or Ba frames were sent by all stations except the first station of the at least two stations, and return, by the AP, the TXOP to the first station.
    [0005]
    5. Method according to claim 3, characterized in that the block confirmation request comprises a reverse direction grant bit / plus physical layer data unit, RDG / plus PPDU, which is set to 0.
    [0006]
    6. Access point, AP, (30), characterized in that it comprises: a TXOP acquisition unit (301), configured to: within a transmission opportunity, TXOP, of a first station, if the TXOP does not ended after the first station has finished sending data to an access point AP, obtaining the TXOP, where the AP obtaining the TXOP is implemented by granting a remaining part of the TXOP to the access point, AP, for the first time station as a reverse direction protocol initiator, and a sending unit (303) configured to send data to at least two stations within the TXOP simultaneously, wherein the at least two stations include the first station, the AP is a reverse direction protocol.
    [0007]
    7. Access point, according to claim 6, characterized in that the sending unit is further configured for: if the TXOP has not ended after the AP has finished sending data to at least two stations, return to TXOP for the first station.
    [0008]
    8. Access point, according to claim 6, characterized in that the sending unit is still configured for: if the TXOP has not ended after the AP finishes sending the data within the TXOP, send a confirmation request block, BAR, to the first station, where the block confirmation request is used to return the TXOP to the first station.
    [0009]
    9. Access point according to claim 8, characterized by the fact that the block acknowledgment request sent by the sending unit comprises a reverse direction grant bit / plus physical layer data unit, RDG / plus PPDU , which is set to 0.
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-12-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-02-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
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    PCT/CN2012/072999|WO2012163157A1|2011-06-25|2012-03-26|Method and device for reverse direction protocol transmission in wireless local area network|
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