WO2021013118A1 - 多ap操作的反向触发系统以及接入点 - Google Patents

多ap操作的反向触发系统以及接入点 Download PDF

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WO2021013118A1
WO2021013118A1 PCT/CN2020/102951 CN2020102951W WO2021013118A1 WO 2021013118 A1 WO2021013118 A1 WO 2021013118A1 CN 2020102951 W CN2020102951 W CN 2020102951W WO 2021013118 A1 WO2021013118 A1 WO 2021013118A1
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access point
data
trigger
cooperative
sends
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PCT/CN2020/102951
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English (en)
French (fr)
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赵育仁
徐彦超
余庆华
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展讯通信（上海）有限公司
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Priority to US16/980,753 priority Critical patent/US11979861B2/en
Priority to EP20843354.0A priority patent/EP4007177A4/en
Publication of WO2021013118A1 publication Critical patent/WO2021013118A1/zh

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    • 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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/028—Dynamic adaptation of the update intervals, e.g. event-triggered updates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H04L63/0457—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply dynamic encryption, e.g. stream encryption
    • 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]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of wireless communication technology, and in particular to a reverse trigger system and access point for multi-AP operation.
  • Trigger frames are sent between APs to achieve synchronization of data transmission and/or start the data transmission process. For example, for the access point AP1 and AP2, the access point AP1 sends a trigger frame to the access point AP2 or the access point AP2 sends a trigger frame to the access point AP1 to trigger the access point AP1 and AP2 Synchronously send data to the station.
  • the distance between the triggered access point and the access point that sends the trigger frame needs to be within a certain range, that is, the two access points can communicate directly.
  • the technical problem solved by the present invention is how to complete joint and synchronous transmission of data between access points that cannot communicate directly.
  • an embodiment of the present invention provides a reverse trigger system for multi-AP operation.
  • the reverse trigger system for multi-AP operation includes: a public station; an initial access point for sending a trigger notification to the public station , The public station sends a trigger frame in response to the trigger notification; the first cooperative access point sends first data in response to receiving the trigger frame; wherein the initializing access point is in response to receiving the trigger Frame the second data.
  • the public site and the initial access point are located in the same basic service set.
  • the trigger notification includes the identifier of the first coordinated access point.
  • the access point receives the data sent by the initialization access point through OOB, and receives a trigger frame within a preset time after receiving the data, and the trigger frame does not include the first cooperative access Point identification, the access point is the first coordinated access point.
  • the trigger notification further includes a start time and an end time for sending the trigger frame, and the public station sends the trigger frame between the start time and the end time.
  • the second data and the first data are the same data
  • the initialization access point uses OOB to send the second data to the first cooperative access point.
  • the second data is different from the first data.
  • the initialization access point sends second data to the public site, and the first cooperative access point sends first data to other sites.
  • the initialization access point sends second data to the public site
  • the first cooperative access point sends first data to its public site.
  • the trigger notification further includes information of a receiving site of the second data.
  • the reverse trigger system for multi-AP operation further includes: a second cooperative access point, which sends third data in response to the trigger notification.
  • the first data and the second data are STS in STBC format; when the number of the first coordinated access points is multiple, each first coordinated access point is configured to send the first One data or the second data.
  • an embodiment of the present invention also discloses an access point, the access point includes: a notification module for sending a trigger notification to a public station, and the public station sends a trigger in response to the trigger notification Frame; a data sending module for sending second data in response to receiving the trigger frame, the first cooperative access point sends the first data in response to receiving the trigger frame, the first cooperative access point and the access Access points are located in different basic service sets, and the trigger notification includes the identity of the first coordinated access point.
  • the reverse trigger system for multi-AP operation may include a public station; an initial access point is used to send a trigger notification to the public station, and the public station sends a trigger frame in response to the trigger notification; A cooperative access point sends first data in response to receiving the trigger frame; wherein, the initialization access point sends second data in response to receiving the trigger frame.
  • the technical solution of the present invention can trigger multi-AP operation through public sites that can communicate with the access points that cannot communicate directly, that is, the initial access point and the first cooperative access point; that is, the public sites can Receiving a trigger notification for initializing the access point, and sending a trigger frame to the first cooperative access point in response to the trigger notification, so that the initializing access point and the first cooperative access point can synchronously send the first data and the second data, It realizes the completion of multi-AP operation between access points that cannot communicate directly, and expands the application scope of multi-AP operation in wireless communication.
  • FIG. 1 is a schematic structural diagram of a reverse trigger system for multi-AP operation according to an embodiment of the present invention
  • Figure 2 is a schematic diagram of a specific application scenario of an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another reverse trigger system for multi-AP operation according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an access point according to an embodiment of the present invention.
  • the distance between the triggered access point and the access point sending the trigger frame needs to be within a certain range, that is, the two access points can directly Communication.
  • the technical solution of the present invention can trigger multi-AP operation through public sites that can communicate with the access points that cannot communicate directly, that is, the initial access point and the first cooperative access point; that is, the public sites can Receiving a trigger notification for initializing the access point, and sending a trigger frame to the first cooperative access point in response to the trigger notification, so that the initializing access point and the first cooperative access point can synchronously send the first data and the second data, It realizes the completion of multi-AP operation between access points that cannot communicate directly, and expands the application scope of multi-AP operation in wireless communication.
  • the multi-AP operation referred to in the embodiment of the present invention may include a multi-AP coordinated operation (Multi-AP coordinated operation) and a multi-AP joint operation (Multi-AP joint operation).
  • Multi-AP coordinated operation refers to multiple APs respectively sending data to different sites
  • multi-AP joint operation refers to multiple APs respectively sending data to the same site.
  • FIG. 1 is a schematic structural diagram of a reverse trigger system for multi-AP operation according to an embodiment of the present invention.
  • the reverse trigger system for multi-AP operation includes a public station 11, an initialization access point 12 and a first cooperative access point 13.
  • the access point 12 is initialized to send a trigger notification to the public station 11, as shown in data flow 1 in FIG. 1.
  • the public station 11 sends a trigger frame in response to the trigger notification, as shown in data flow 2 in FIG. 1.
  • the first cooperative access point 13 sends the first data in response to receiving the trigger frame.
  • the first cooperative access point 13 and the initialization access point 12 are far away, and the first cooperative access point 13 and the initialization access point 12 cannot communicate directly.
  • the initial access point 12 and the public site 11 may be located in one basic service set, and the first cooperative access point 13 and the public site 11 may be located in another basic service set, so that the initial access point 12 may be located in the public site 11 to communicate, the first cooperative access point 13 may also communicate with the public site 11.
  • the public station 11 can be used to trigger the initial multi-AP operation of the access point 12 and the first cooperative access point 13.
  • the number of the first cooperative access point 13 may be one or multiple, which is not limited in the embodiment of the present invention.
  • the public site 11 may be a roaming site (Station, STA) between basic service sets.
  • STA roaming site
  • the initialization access point 12 sends the second data in response to receiving the trigger frame.
  • the trigger notification includes the identity of the first cooperative access point 13. That is to say, the trigger notification sent by the initial access point 12 to the public station 11 includes the identification of the first cooperative access point 13, so that the public station 11 can learn the target of its trigger frame transmission, then the trigger frame is received
  • the access point at is the first coordinated access point 13, which is used to coordinate and initialize the access point 12 to send data.
  • the access point receives the data sent by the initial access point through OOB, and receives a trigger frame within a preset time after receiving the data, and the trigger notification does not include the first If a coordinated access point is identified, the access point is the first coordinated access point 13.
  • the OOB refers to a transmission method other than the currently used wireless channel, which may be a wireless or wired transmission method.
  • the access point can check whether it receives the data sent by the initial access point through OOB, and whether to preset after receiving the data A trigger frame is received within time to determine whether it is used as the first cooperative access point 13 to cooperatively initialize the access point 12 to send data.
  • the preset time may be agreed in advance by the first cooperative access point 13 and the initialization access point 12, or may be agreed through an agreement, which is not limited in the embodiment of the present invention.
  • first data and the second data may be the same or different, and the receiving sites of the first data and the second data may be the same or different.
  • the access point AP1 when it needs to perform multiple AP operations, it sends a trigger notification to station a, and the trigger notification includes the identification of the access point AP2; station a sends the trigger frame to the access points AP1 and AP2, Enable AP2 to perform multiple AP operations with AP1.
  • the multi-AP operation can be triggered through the public stations that can both communicate; that is, the public station can Receiving a trigger notification for initializing the access point, and sending a trigger frame to the first cooperative access point in response to the trigger notification, so that the initializing access point and the first cooperative access point can synchronously send the first data and the second data, It realizes the completion of multi-AP operation between access points that cannot communicate directly, and expands the application scope of multi-AP operation in wireless communication.
  • the second data and the first data are the same data
  • the initialization access point uses OOB (Out of Band, for short) to send the second data To the first cooperative access point.
  • OOB Out of Band, for short
  • the data sent by the initializing access point 12 and the first cooperative access point 13 are the same data, and the data may be sent by the initializing access point 12 to the first cooperative access point 13 using OOB.
  • the initial access point 12 uses a wired or wireless transmission channel that is different from the wireless transmission channel used by other stations to transmit information (such as data information, control information, trigger notification, etc.) to send data to the first cooperative access point 13. To ensure that the air interface time of the original wireless transmission channel is not occupied.
  • the second data is different from the first data.
  • the initial access point 12 and the first cooperative access point 13 respectively send their respective data to the station.
  • the initialization access point sends second data to the public site, and the first cooperative access point sends first data to other sites.
  • the multi-AP operation performed by the initial access point 12 and the first cooperative access point 13 may be a multi-AP coordinated operation, that is, the first data and the second data are sent separately To different sites, the first data and the second data may be the same or different.
  • the initialization access point sends second data to the public site
  • the first cooperative access point sends first data to its public site.
  • the multi-AP operation performed by the initial access point 12 and the first cooperative access point 13 may be a multi-AP joint operation, that is, the first data and the second data are sent separately To the same site, such as the public site 11, the first data and the second data may be the same or different.
  • the access point AP1 and the access point AP2 respectively send the second data and the first data within the time range T3.
  • the start time of the time range T3, that is, the time when the first data or the second data starts to be sent, and the trigger frame have a preset time offset.
  • the sending time of the first data and the sending time of the second data may not be completely synchronized, that is, there may be a certain deviation, the same, the first data
  • the end time of and the end time of the second data may also be incompletely synchronized.
  • the transmission start time of the first data or the second data may be consistent with the start time of the time range T3.
  • the station STA After the station STA receives the data, it can send an acknowledgement (ACKnowledment, ACK).
  • ACKnowledment ACK
  • the time interval between the time range T1, the time range T2, and the time range T3 may be a short space interframe (SIFS).
  • SIFS short space interframe
  • the trigger notification further includes a start time and an end time for sending the trigger frame, and the public station sends all data between the start time and the end time.
  • the trigger frame further includes a start time and an end time for sending the trigger frame, and the public station sends all data between the start time and the end time.
  • the access point AP1 sends a trigger notification within the time range T1.
  • the trigger notification includes the start time and end time of sending the trigger frame, that is, the start time and end time of the time range T2.
  • the public station STA sends a trigger frame within the time range T2.
  • the second cooperative access point 14 shown in FIG. 3 since it cannot receive the trigger frame, but it needs to send data after the trigger frame, it needs to obtain the start of the trigger frame Time and end time or start time of T3. Since the second cooperative access point 14 can receive the trigger notification, the start time and end time of the trigger frame or the start time of T3 can be carried in the trigger notification.
  • the trigger notification may not include the start time and end time of sending the trigger frame.
  • the second cooperative access point 14 and the initializing access point 12 may pre-appoint the time information of the trigger frame, so there is no need to include the start time and end time of the trigger frame in the trigger notification.
  • the trigger notification further includes information of the receiving station of the second data.
  • the initializing access point 12 can carry the information of the station whose data is to be sent in the trigger notification, so that the public station can learn the information of the receiving station of the second data sent by the initializing access point 12, so that the first A cooperative access point 13 can also know the information of the receiving station that initializes the second data sent by the access point 12, so that the first cooperative access point 13 can avoid sending the second data when sending the first data. interference.
  • the system may further include a second coordinated access point 14, which can send third data in response to the trigger notification.
  • the second cooperative access point 14 may receive the trigger notification from the initializing access point 12, and send the third data directly in response to the trigger notification.
  • the first cooperative access point 13 and the initialization access point 12 are located in different basic service sets, such as the basic service set B shown in FIG. 3, and the public site 11 is located in both the basic service set A and the basic service set. B, therefore the first cooperative access point 13 needs to respond to the trigger frame sent by the public station 11 to send the first data, or the public station 11 has not joined the basic service set B, and the first cooperative access point 13 can respond to the public The station 11 sends a trigger frame to send the first data.
  • the second cooperative access point 14 when the second cooperative access point 14 sends the third data in response to the trigger notification, it may send the third data after the first preset time offset after the trigger notification is received.
  • the first cooperative access point 13 When the first cooperative access point 13 sends the first data in response to the trigger frame, it may send the first data after the second preset time offset after the trigger frame is received, so as to ensure that the first data and the third data Synchronous sending. Wherein, the first preset time offset is greater than the second preset time offset.
  • the first data and the second data are STS (Space-time Stream, abbreviated as time division stream) in STBC (Space-time block code, abbreviated as space-time block code) format. ); when the number of the first coordinated access points is multiple, each first coordinated access point is configured to send the first data or the second data.
  • STS Space-time Stream, abbreviated as time division stream
  • STBC Space-time block code, abbreviated as space-time block code
  • the embodiment of the present invention uses the STS in the STBC format to perform the multi-AP operation, which can reduce the requirements of the wireless communication system on the timing accuracy.
  • the embodiment of the present invention also discloses an access point 40.
  • the access point 40 may include a notification module 401 and a data sending module 402.
  • the notification module 401 is used to send a trigger notification to a public station, and the public station sends a trigger frame in response to the trigger notification; the data sending module 402 is used to send second data in response to receiving the trigger frame, and the first collaboration
  • the access point sends first data in response to receiving the trigger frame, the first cooperative access point and the access point are located in different basic service sets, and the trigger notification includes the identification of the first cooperative access point .
  • the access point 40 may be the initialization access point 12 shown in FIG. 1 or FIG. 3.
  • the access point 40 includes, but is not limited to, any communicable terminal devices such as mobile phones, computers, tablet computers, and routers.

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Abstract

一种多AP操作的反向触发系统以及接入点，多AP操作的反向触发系统包括：公共站点；初始化接入点，用以向所述公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；第一协作接入点，响应于接收到所述触发帧发送第一数据；其中，所述初始化接入点响应于接收到所述触发帧发送第二数据。本发明技术方案能够在不能直接通信的接入点之间完成数据的联合同步发送。

Description

多AP操作的反向触发系统以及接入点
[根据细则26改正29.07.2020]　
本申请要求于2019年7月24日提交中国专利局、申请号为201910670388.9、发明名称为“多AP操作的反向触发系统以及接入点”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
本发明涉及无线通信技术领域，尤其涉及一种多AP操作的反向触发系统以及接入点。
背景技术
在无线局域网的协议中，讨论了多个接入点(Access Point,AP)的联合功能。通过在AP之间发送触发帧，以实现数据发送的同步和/或启动数据发送过程。例如对于接入点AP1和接入点AP2，通过接入点AP1向接入点AP2发送触发帧或者接入点AP2向接入点AP1发送触发帧，来触发接入点AP1和接入点AP2同步向站点发送数据。
但是，现有技术中的多AP触发方案中，需要要求被触发的接入点与发送触发帧的接入点的距离在一定范围内，也即两个接入点能够直接通信。
发明内容
本发明解决的技术问题是如何在不能直接通信的接入点之间完成数据的联合同步发送。
为解决上述技术问题，本发明实施例提供一种多AP操作的反向触发系统，多AP操作的反向触发系统包括：公共站点；初始化接入 点，用以向所述公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；第一协作接入点，响应于接收到所述触发帧发送第一数据；其中，所述初始化接入点响应于接收到所述触发帧发送第二数据。
可选的，所述公共站点与所述初始化接入点位于同一基础服务集。
可选的，所述触发通知包括所述第一协作接入点的标识。
可选的，如果接入点通过OOB接收所述初始化接入点发送的数据，并在接收到数据后预设时间内接收到触发帧，且所述触发帧未包含所述第一协作接入点的标识，则所述接入点为所述第一协作接入点。
可选的，所述触发通知还包括发送所述触发帧的起始时间和结束时间，所述公共站点在所述起始时间和所述结束时间之间发送所述触发帧。
可选的，所述第二数据与所述第一数据为同一数据，所述初始化接入点利用OOB发送所述第二数据至所述第一协作接入点。
可选的，所述第二数据与所述第一数据不同。
可选的，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其他站点。
可选的，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其所述公共站点。
可选的，所述触发通知还包括所述第二数据的接收站点的信息。
可选的，所述多AP操作的反向触发系统还包括：第二协作接入点，响应于所述触发通知发送第三数据。
可选的，所述第一数据和所述第二数据为STBC格式的STS；所述第一协作接入点的数量为多个时，每个第一协作接入点被配置发送 所述第一数据或所述第二数据。
为解决上述技术问题，本发明实施例还公开了一种接入点，所述接入点包括：通知模块，用以向公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；数据发送模块，用以响应于接收到所述触发帧发送第二数据，第一协作接入点响应于接收到所述触发帧发送第一数据，所述第一协作接入点与接入点位于不同的基础服务集，所述触发通知包括所述第一协作接入点的标识。
与现有技术相比，本发明实施例的技术方案具有以下有益效果：
本发明技术方案中，多AP操作的反向触发系统可以包括公共站点；初始化接入点，用以向所述公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；第一协作接入点，响应于接收到所述触发帧发送第一数据；其中，所述初始化接入点响应于接收到所述触发帧发送第二数据。本发明技术方案对于不能直接通信的接入点，也即初始化接入点和第一协作接入点，可以通过其均能进行通信的公共站点来触发多AP操作；也就是说，公共站点可以接收初始化接入点的触发通知，并响应于触发通知发送触发帧至第一协作接入点，使得初始化接入点和第一协作接入点能够同步进行第一数据和第二数据的发送，实现了在不能直接通信的接入点之间完成多AP操作，扩大了无线通信中多AP操作的适用范围。
附图说明
图1是本发明实施例一种多AP操作的反向触发系统的结构示意图；
图2是本发明实施例一种具体应用场景的示意图；
图3是本发明实施例另一种多AP操作的反向触发系统的结构示意图；
图4是本发明实施例一种接入点的结构示意图。
具体实施方式
如背景技术中所述，现有技术中的多AP触发方案中，需要要求被触发的接入点与发送触发帧的接入点的距离在一定范围内，也即两个接入点能够直接通信。
本发明技术方案对于不能直接通信的接入点，也即初始化接入点和第一协作接入点，可以通过其均能进行通信的公共站点来触发多AP操作；也就是说，公共站点可以接收初始化接入点的触发通知，并响应于触发通知发送触发帧至第一协作接入点，使得初始化接入点和第一协作接入点能够同步进行第一数据和第二数据的发送，实现了在不能直接通信的接入点之间完成多AP操作，扩大了无线通信中多AP操作的适用范围。
本发明实施例所称的多AP操作可以包括多AP协调操作(Multi-AP coordinated operation)以及多AP联合操作(Multi-AP joint operation)。其中，多AP协调操作是指多个AP分别发送数据至不同的站点；多AP联合操作是指多个AP分别发送数据至同一站点。
为使本发明的上述目的、特征和优点能够更为明显易懂，下面结合附图对本发明的具体实施例做详细的说明。
图1是本发明实施例一种多AP操作的反向触发系统的结构示意图。
如图1所示，多AP操作的反向触发系统包括公共站点11、初始化接入点12和第一协作接入点13。
具体实施中，初始化接入点12用以向所述公共站点11发送触发通知，如图1中数据流1所示。所述公共站点11响应于所述触发通知发送触发帧，如图1中数据流2所示。
第一协作接入点13响应于接收到所述触发帧发送第一数据。
本实施例中，第一协作接入点13与所述初始化接入点12距离较远，第一协作接入点13与所述初始化接入点12不能直接通信。具体而言，初始化接入点12与公共站点11可以位于一个基础服务集，第一协作接入点13与公共站点11可以位于另一个基础服务集，由此初始化接入点12可以与公共站点11进行通信，第一协作接入点13也可以与公共站点11进行通信。在需要进行多AP操作时，可以经由公共站点11来触发初始化接入点12与第一协作接入点13的多AP操作。
需要说明的是，第一协作接入点13的数量可以是一个，也可以是多个，本发明实施例对此不作限制。
在一个具体应用场景中，公共站点11可以是在基础服务集之间的漫游的站点(Station,STA)。
具体实施中，所述初始化接入点12响应于接收到所述触发帧发送第二数据。
在一个具体实施例中，所述触发通知包括所述第一协作接入点13的标识。也就是说，初始化接入点12向公共站点11发送的触发通知中包括所述第一协作接入点13的标识，以使得公共站点11能够获知其触发帧发送的对象，那么接收到触发帧的接入点为第一协作接入点13，以用于协作初始化接入点12发送数据。
在另一个具体实施例中，如果接入点通过OOB接收所述初始化接入点发送的数据，并在接收到数据后预设时间内接收到触发帧，且所述触发通知未包含所述第一协作接入点的标识，则所述接入点为所述第一协作接入点13。
所述OOB是指在目前所用无线信道之外的其他传输方式,可以是无线或是有线的传输方式。
本实施例中，对于触发通知未包含第一协作接入点的标识的情况，接入点可以通过其是否通过OOB接收所述初始化接入点发送的 数据，以及是否在接收到数据后预设时间内接收到触发帧来确定其是否作为第一协作接入点13来协作初始化接入点12发送数据。
需要说明的是，所述预设时间可以是第一协作接入点13与初始化接入点12预先约定好的，也可以是通过协议来约定的，本发明实施例对此不作限制。
更具体地，第一数据与第二数据可以相同，也可以不同，第一数据与第二数据的接收站点可以相同，也可以不同。
在一个具体应用场景中，接入点AP1需要进行多AP操作时，向站点a发送触发通知，触发通知中包括接入点AP2的标识；站点a将触发帧发送至接入点AP1与AP2，使AP2能够与AP1执行多AP操作。
本发明实施例对于不能直接通信的接入点，也即初始化接入点和第一协作接入点，可以通过其均能进行通信的公共站点来触发多AP操作；也就是说，公共站点可以接收初始化接入点的触发通知，并响应于触发通知发送触发帧至第一协作接入点，使得初始化接入点和第一协作接入点能够同步进行第一数据和第二数据的发送，实现了在不能直接通信的接入点之间完成多AP操作，扩大了无线通信中多AP操作的适用范围。
在本发明一个非限制性的实施例中，所述第二数据与所述第一数据为同一数据，所述初始化接入点利用OOB(Out of Band,简称带外)发送所述第二数据至所述第一协作接入点。
本实施例中，初始化接入点12与第一协作接入点13所发送的数据为同一数据，该数据可以是初始化接入点12利用OOB发送给第一协作接入点13。换言之，初始化接入点12采用与其他站点间传输信息(例如数据信息、控制信息、触发通知等)所使用无线传输通道不同的有线或无线传输通道来发送数据至第一协作接入点13，以保证能不占用原无线传输通道的空口时间。
在本发明一个非限制性的实施例中，所述第二数据与所述第一数据不同。
本实施例中，在多AP操作中，初始化接入点12与第一协作接入点13分别向站点发送各自的数据。
进一步地，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其他站点。
本实施例中，初始化接入点12与第一协作接入点13所执行的多AP操作可以是多AP协调操作(Multi-AP coordinated operation)，也即分别将第一数据和第二数据发送至不同的站点，第一数据与所述第二数据可以相同，也可以不同。
或者，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其所述公共站点。
本实施例中，初始化接入点12与第一协作接入点13所执行的多AP操作可以是多AP联合操作(Multi-AP joint operation)，也即分别将第一数据和第二数据发送至相同的站点，例如所述公共站点11，第一数据与所述第二数据可以相同，也可以不同。
在一个具体应用场景中，继续参照图2，接入点AP1和接入点AP2在时间范围T3内分别发送第二数据和第一数据。时间范围T3的起始时间，也即开始发送所述第一数据或第二数据的时刻与所述触发帧具备预设的时间偏移量。接入点AP1和接入点AP2执行多AP联合操作时，第一数据的发送时刻和第二数据的发送时刻是完全同步的，第一数据的结束时刻和第二数据的结束时刻也是完全同步的。接入点AP1和接入点AP2执行多AP协调操作时，第一数据的发送时刻和第二数据的发送时刻可以是不完全同步的，也即可以存在一定的偏差，同理，第一数据的结束时刻和第二数据的结束时刻也可以是不完全同步的。
需要说明的是，第一数据或第二数据的发送开始时间可以与时间 范围T3的起始时间一致。
站点STA在接收到数据后，可以发送确认(ACKnowledment,ACK)。
具体而言，时间范围T1、时间范围T2以及时间范围T3之间的时间间隔可以是帧间短时间间隔(Short Space Interframe,SIFS)。关于SIFS的具体长度可以参照现有技术，本发明实施例对此不作限制。
在本发明一个非限制性的实施例中，所述触发通知还包括发送所述触发帧的起始时间和结束时间，所述公共站点在所述起始时间和所述结束时间之间发送所述触发帧。
具体请继续参照图2，接入点AP1在时间范围T1内发送触发通知，触发通知包括发送触发帧的起始时间和结束时间，也即时间范围T2的起始时间和结束时间。公共站点STA在时间范围T2内发送触发帧。
具体地，一并参照图3，对于图3所示的第二协作接入点14，由于其无法接收到触发帧，但其需要在触发帧之后发送数据，因此其需要获得触发帧的起始时间和结束时间或T3的起始时间。由于第二协作接入点14可以接收触发通知，因此可以将触发帧的起始时间和结束时间或T3的起始时间承载在触发通知中。
本发明一个可选实施例中，触发通知可以不包括发送触发帧的起始时间和结束时间。在这种情况下，可以是第二协作接入点14与初始化接入点12预先约定好了触发帧的时间信息，故而无需在触发通知中包含触发帧的起始时间和结束时间。
在本发明一个非限制性的实施例中，所述触发通知还包括所述第二数据的接收站点的信息。
换句话说，初始化接入点12可以将其数据要发送的站点的信息携带在触发通知中，使得公共站点能够获知初始化接入点12所发送的第二数据的接收站点的信息，从而使得第一协作接入点13也能够 获知初始化接入点12所发送的第二数据的接收站点的信息，进而使得第一协作接入点13能够在发送第一数据时避免对第二数据的发送产生干扰。
在本发明一个非限制性的实施例中，请一并参照图1和图3，除了公共站点11、初始化接入点12和第一协作接入点13之外，多AP操作的反向触发系统还可以包括第二协作接入点14，第二协作接入点14能够响应于所述触发通知发送第三数据。
本实施例中，第二协作接入点14可以接收来自初始化接入点12的触发通知，并直接响应于所述触发通知发送第三数据。
而由于第一协作接入点13与所述初始化接入点12位于不同基础服务集，如图3所示的基础服务集B，且公共站点11既位于基础服务集A，也位于基础服务集B，因此第一协作接入点13需要响应于公共站点11发送的触发帧来发送第一数据，或公共站点11并未加入基础服务集B，且第一协作接入点13可以响应于公共站点11发送的触发帧来发送第一数据。
进一步而言，第二协作接入点14在响应于所述触发通知发送第三数据时，可以是在接收到触发通知后的第一预设时间偏移量之后发送第三数据。第一协作接入点13在响应于触发帧发送第一数据时，可以是在接收到触发帧后的第二预设时间偏移量之后发送第一数据，以保证第一数据和第三数据的同步发送。其中，第一预设时间偏移量大于第二预设时间偏移量。
在本发明一个非限制性的实施例中，所述第一数据和所述第二数据为STBC(Space-time block code，简称空时分组码)格式的STS(Space-time Stream,简称时分流)；所述第一协作接入点的数量为多个时，每个第一协作接入点被配置发送所述第一数据或所述第二数据。
本发明实施例通过采用STBC格式的STS来执行多AP操作，可 以降低无线通信系统对定时精度的要求。
请参照图4，本发明实施例还公开了一种接入点40，接入点40可以包括通知模块401和数据发送模块402。
其中，通知模块401用以向公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；数据发送模块402用以响应于接收到所述触发帧发送第二数据，第一协作接入点响应于接收到所述触发帧发送第一数据，所述第一协作接入点与接入点位于不同的基础服务集，所述触发通知包括所述第一协作接入点的标识。
具体实施中，接入点40可以是图1或图3中所示的初始化接入点12。
具体地，所述接入点40包括但不限于手机、计算机、平板电脑、路由器等任意可通信的终端设备。
关于所述接入点40的工作原理、工作方式的更多内容，可以参照图1至图3中的相关描述，这里不再赘述。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (13)

  1. 一种多AP操作的反向触发系统，其特征在于，包括：
    公共站点；
    初始化接入点，用以向所述公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；
    第一协作接入点，响应于接收到所述触发帧发送第一数据；
    其中，所述初始化接入点响应于接收到所述触发帧发送第二数据。
  2. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述公共站点与所述初始化接入点位于同一基础服务集。
  3. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述触发通知包括所述第一协作接入点的标识。
  4. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，如果接入点通过OOB接收所述初始化接入点发送的数据，并在接收到数据后预设时间内接收到触发帧，且所述触发通知未包含所述第一协作接入点的标识，则所述接入点为所述第一协作接入点。
  5. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述触发通知还包括发送所述触发帧的起始时间和结束时间，所述公共站点在所述起始时间和所述结束时间之间发送所述触发帧。
  6. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述第二数据与所述第一数据为同一数据，所述初始化接入点利用OOB发送所述第二数据至所述第一协作接入点。
  7. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述第二数据与所述第一数据不同。
  8. 根据权利要求6或7所述的多AP操作的反向触发系统，其特征在 于，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其他站点。
  9. 根据权利要求6或7所述的多AP操作的反向触发系统，其特征在于，所述初始化接入点发送第二数据至所述公共站点，所述第一协作接入点发送第一数据至其所述公共站点。
  10. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述触发通知还包括所述第二数据的接收站点的信息。
  11. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，还包括：
    第二协作接入点，响应于所述触发通知发送第三数据。
  12. 根据权利要求1所述的多AP操作的反向触发系统，其特征在于，所述第一数据和所述第二数据为STBC格式的STS；所述第一协作接入点的数量为多个时，每个第一协作接入点被配置发送所述第一数据或所述第二数据。
  13. 一种接入点，其特征在于，包括：
    通知模块，用以向公共站点发送触发通知，所述公共站点响应于所述触发通知发送触发帧；
    数据发送模块，用以响应于接收到所述触发帧发送第二数据，第一协作接入点响应于接收到所述触发帧发送第一数据。
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