WO2012159497A1 - 一种信道反馈信息的传输方法及系统 - Google Patents

一种信道反馈信息的传输方法及系统 Download PDF

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Publication number
WO2012159497A1
WO2012159497A1 PCT/CN2012/073263 CN2012073263W WO2012159497A1 WO 2012159497 A1 WO2012159497 A1 WO 2012159497A1 CN 2012073263 W CN2012073263 W CN 2012073263W WO 2012159497 A1 WO2012159497 A1 WO 2012159497A1
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Prior art keywords
feedback information
channel
sender
channel feedback
radio frame
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PCT/CN2012/073263
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English (en)
French (fr)
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江岸明
邢卫民
孙波
姜静
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中兴通讯股份有限公司
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Publication of WO2012159497A1 publication Critical patent/WO2012159497A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for transmitting channel feedback information. Background technique
  • WLANs are rapidly evolving, demand for WLAN coverage is increasing, and throughput requirements are increasing.
  • IEEE802.il group of the Institute of Electrical and Electronics Engineers a series of standard WLAN technologies such as T 802.11a, 802.11b, 802.11g, etc. have been defined, followed by other task groups, which are dedicated to the development of existing 802.11.
  • Specifications for technical improvements, for example, the 802.11n task group proposes high throughput (HT) requirements and supports data rates up to 600 Mbps.
  • the 802.11ac task group further proposes the concept of Very High Throughput (VHT). by introducing larger channel bandwidth will increase the data rate to lGbps 0
  • an Access Point (AP) and multiple stations (Stations, STAs) associated with an AP form a Basic Service Set (BSS).
  • BSS Basic Service Set
  • 802.11 defines two modes of operation: Distributed Coordination Function (DCF) and Point Coordination Function (PCF), and improvements to these two modes of operation: Enhanced Distributed Coordination Access (Enhanced) Distributed Channel Access (EDCA) and Hybrid Coordination Function Controlled Channel Access (HCCA).
  • DCF is the most basic mode of operation, using CSMA/CA (CSMA with Collision Avoidance) with collision avoidance carrier sharing mechanism to make multiple stations share wireless channels.
  • EDCA is an enhanced mode of operation that utilizes the CSMA/CA mechanism to enable multiple different priority queues Share the wireless channel and reserve a Transmission Opportunity (TXOP). A transmission opportunity is reserved for a reservation (TXOP Duration).
  • a new frame exchange sequence is defined for channel information collection.
  • the sender sends a Null Data Packet Announcement (NDPA) frame and sends a null data packet (NDP) after the Short InterFrame Space (SIFS) at the end of the NDPA transmission.
  • the first receiver indicated in the NDPA returns the channel feedback information (Sounding Feedback) after receiving the SIFS of the NDPA and the NDP. If there are multiple channel feedback parties, after the first feedback party defaults to feedback channel information, the sender waits for one SIFS, and then polls the other receivers (Sounding Poll) to feed back the channel information, as shown in Figure 1.
  • the bandwidths of the NDPA, NDP, and Sounding Poll frames sent by the sender are equal.
  • the used transmission bandwidth may be less than or equal to the bandwidth used by the previous transmitting direction to the frame sent by the receiving party. How to determine the specifically used bandwidth is one of the problems to be solved by the present invention.
  • the format adopted by the sender for the NDPA, NDP, and Sounding Poll frames sent by the channel information collection may be non-HT (non High Throughput), HT, VHT (very High Throughput), and when non- In HT, for a bandwidth greater than 20MHz, the sender will duplicate in 20MHz, and each 20MHz channel is a subchannel, in which one subchannel of 20MHz bandwidth is the main channel, and the remaining subchannels are auxiliary channels.
  • the receiver only decodes and parses the frame transmitted by the primary channel. If the I/G bit of the TA (transmission address) field of the frame is 1, the receiver judges the transmission by using the bandwidth indication bit in the SERVICE field of the frame.
  • the transmission bandwidth of the party, and then the channel measurement information is sent to the sender. If the I/G bit of the TA (transmission address) field of this frame is 0, the receiver considers that the transmission bandwidth of the sender is the main channel bandwidth. Since the receiver does not perform channel state detection, there is an interference problem caused by the Overlapping Basic Service Set (OBSS), that is, when the receiver feeds back the channel information to the sender, it will not be able to detect the neighboring sender. Hidden sites cause interference.
  • OBSS Overlapping Basic Service Set
  • the main purpose of the present invention is to provide a method and system for transmitting channel feedback information, which is applied to an ultra-high-throughput VHT wireless local area network system, and is used to solve the problem of bandwidth selection of a receiver when feeding back channel information. And since the receiver does not perform the idle channel assessment CCA detection, there is a problem of interference in the case where the basic service sets overlap.
  • a method for transmitting channel feedback information comprising:
  • the receiver after receiving the radio frame sent by the sender for requesting channel feedback information, the receiver selects an appropriate bandwidth according to the idle channel assessment result to send channel feedback information to the sender.
  • the sender only needs to vacate the specified interframe space before transmitting the radio frame for requesting the channel feedback information, and the receiver performs the idle channel assessment detection within the specified interframe interval.
  • the receiving party sends the channel feedback information to the sender according to the idle channel assessment result and selects an appropriate bandwidth, which is specifically:
  • the receiving party performs idle channel assessment detection on the subchannel within a specified interframe interval before the transmitting party sends the radio frame for requesting channel feedback information;
  • the receiver judges that there is an idle subchannel according to the idle channel assessment result, the receiver selects an appropriate bandwidth to send channel feedback information to the sender.
  • the radio frame sent by the sender for requesting channel feedback information is a radio frame of a non-high throughput copy format.
  • the radio frame of the non-high throughput copy format is specifically an empty packet advertised NDPA frame or a snoop polling Sounding Poll frame.
  • the specified interframe space is at least one point cooperative function interframe space PIFS.
  • the present invention further provides another method for transmitting channel feedback information, where the method includes: In a wireless LAN system with ultra-high throughput VHT, the sender must vacate at least a specified interframe space before transmitting a radio frame for requesting channel feedback information, and the specified interframe space is used for the receiver to perform an idle channel. Evaluation test
  • the sender receives the channel feedback information sent by the opposite end after transmitting the radio frame for requesting the channel feedback information.
  • the present invention further provides a transmission system for channel feedback information, where the system includes:
  • a sender configured to send a radio frame for requesting channel feedback information
  • the receiving side is configured to: after receiving the radio frame for requesting the channel feedback information sent by the sender, select the appropriate bandwidth according to the idle channel assessment result to send the channel feedback information to the sender.
  • the sender only needs to vacate the specified interframe space before transmitting the radio frame for requesting the channel feedback information, and the receiver performs the idle channel assessment detection within the specified interframe interval.
  • the receiving party includes:
  • An evaluation module configured to perform idle channel assessment detection on the subchannel within a specified interframe interval before the transmitting party sends the radio frame for requesting channel feedback information
  • a judging module configured to determine, according to the idle channel assessment result of the assessment module, whether there is an idle subchannel
  • the feedback module is configured to: according to the judgment result of the determining module, select an appropriate bandwidth to send channel feedback information to the sender.
  • the sender must vacate the specified interframe space at least before transmitting the radio frame for requesting the channel feedback information, and the receiver performs the idle channel assessment detection within the specified interframe interval, and the receiver receives the transmission.
  • the channel selects an appropriate bandwidth according to the idle channel assessment result to send channel feedback information to the sender; since the receiver performs idle channel assessment detection before transmitting the channel feedback information, thereby selecting Idle
  • the bandwidth is transmitted in accordance with the bandwidth requirement of the protocol, so that the interference problem caused by the overlap of the basic service set can be avoided, and the problem of the bandwidth selection of the feedback channel is also solved.
  • FIG. 2 is a flowchart of a method for transmitting channel feedback information according to Embodiment 1 of the present invention
  • FIG. 3 is a functional block configuration diagram of a channel feedback information transmission system according to Embodiment 5 of the present invention.
  • FIG. 2 is a flowchart of a method for feeding back channel feedback information provided by the present invention, where the method is applied to a wireless local area network system with ultra high throughput VHT, including the following steps;
  • Step 201 The sender sends a radio frame for requesting channel feedback information to the receiver. Further, the sender sends at least a specified interframe space before transmitting the radio frame for requesting channel feedback information, the specified frame.
  • the interval is at least one Point Coordination Function (PCF) Interframe Space (PIFS); further, the radio frame sent by the sender for requesting channel feedback information is non-high throughput replication.
  • PCF Point Coordination Function
  • PIFS Point Coordination Function
  • a (non-HT duplicate) format radio frame specifically an empty packet advertised NDPA frame, or an empty packet NDP frame, or a snoop polling Sounding Poll frame.
  • Step 202 After receiving the radio frame sent by the sender for requesting channel feedback information, the receiver selects an appropriate bandwidth according to the idle channel assessment result to feed back the channel information to the sender.
  • the receiver performs the idle channel assessment detection on the subchannel, and according to the idle channel. Evaluating the detection result to determine whether there is an available idle subchannel. If there is an idle subchannel, and the idle subchannel meets the bandwidth type requirement of the feedback channel information, the receiver selects the bandwidth corresponding to the feedback channel information to the bandwidth type to feed back the channel. information.
  • the requirement of the feedback channel information for the type of bandwidth mainly means that the prior art can only select four bandwidths of 20 MHz, 40 MHz, 80 MHz or 160 MHz for feedback channel information.
  • one or more stations access the network through the access point AP, and the method for transmitting the channel feedback information according to the present invention is as follows;
  • Step 101 The access point AP sends a VHT or HT format NDPA frame, and the NDPA frame is the first frame, and after the NDPA frame is sent, the short interframe space (SIFS) is sent, and the NDP frame is sent to the control and management.
  • SIFS short interframe space
  • Step 102 After receiving the NDPA frame and the NDP frame, the first station indicated in the first frame of the NDPA selects an idle channel to reply channel sounding feedback after spacing SIFS;
  • the first station can directly select the idle channel reply channel listening feedback according to the existing protocol, and does not need to perform Clear Channel Assessment (CCA) check; ;
  • CCA Clear Channel Assessment
  • Step 103 After receiving the channel listening feedback of the first station, the AP waits for the PIFS and sends a non-HT duplicate format listening polling to the second station.
  • Step 104 The second station performs the idle channel assessment detection CCA in the PIFS before the access point AP sends the Sounding Poll to obtain its own channel state information.
  • Step 105 The second station receives the Sounding Poll, and after receiving the Sounding Poll interval, selects an idle channel reply channel listening feedback according to the idle channel assessment detection result.
  • the access point AP After receiving the channel feedback information of the second site, the access point AP follows the second site. The communication method continues to communicate to the remaining sites.
  • the sounding Poll triggers the subordinate station to feed back the channel listening feedback to the access station AP, and the subordinate station first idles before the feedback.
  • the channel is assessed, and then the idle channel feedback Sounding Feedback is selected based on the evaluation result. Since the site performs idle channel assessment detection before feedback Sounding Feedback, the problem of interference caused by the overlap of basic service sets is avoided, and the problem of feedback channel bandwidth selection is also solved.
  • one or more stations access the network through the access point AP, and the method for transmitting the channel feedback information according to the present invention is as follows;
  • Step 201 The access point AP sends the NDPA in the non-HT duplicate format as the first frame, and sends the NDP frame after the SIFS is sent after the NDPA transmission ends.
  • Step 202 The first station indicated in the NDPA frame performs idle channel assessment CCA detection in the PIFS before the access point AP sends the NDPA, and determines that the channel is busy;
  • Step 203 The first station receives the NDPA frame sent by the access point AP, and after waiting for the SIFS after receiving the NDPA frame and the NDP frame, selects the idle channel reply channel sounding feedback Sounding Feedback according to the idle channel assessment result.
  • Step 204 After receiving the channel listening feedback of the first station, the access point AP waits for a PIFS and then sends a non-HT duplicate format Sounding Poll to the second station.
  • Step 205 The second station performs the idle channel assessment in the PIFS before the access point AP sends the Sounding Poll, and determines that the channel is busy;
  • Step 206 After receiving the Sounding Poll and waiting for the SIFS, the second station selects an idle channel reply channel sounding feedback Sounding Feedback according to the idle channel assessment result; and accesses the AP after receiving the channel feedback information of the second station.
  • the NDPA first frame sent by the access point AP also adopts a non-HT duplicate format, and the first station also performs idle channel assessment detection before feedback channel feedback feedback, thereby solving the problem.
  • the NDPA first frame also uses the non-HT duplicate format, the basic service set overlap and the feedback channel bandwidth selection problem.
  • a plurality of sites access the network through the access point AP, and the method for transmitting the channel feedback information provided by the present invention is as follows;
  • Step 301 In a Transmission Opportunity (TXOP), the access point waits for a PIFS to send an NDPA frame in a non-HT duplicate format, and sends an NDP frame after the NDPA sends the end interval SIFS.
  • TXOP Transmission Opportunity
  • the NDPA frame in the non-HT duplicate format sent by the access point AP is not the first frame
  • Step 302 The first station indicated in the NDPA frame performs idle channel assessment CCA detection in the PIFS before the access point AP sends the NDPA, and determines that the channel is busy;
  • Step 303 The first station receives the NDPA frame sent by the access point AP, and after waiting for the SIFS after receiving the NDPA frame and the NDP frame, selecting the idle channel reply channel listening feedback according to the idle channel assessment detection result;
  • Step 304 After receiving the channel listening feedback of the first station, the access point AP waits for a PIFS and then sends a non-HT duplicate format Sounding Poll to the second station.
  • Step 305 The second station performs the idle channel assessment in the PIFS before the access point AP sends the Sounding Poll, and determines that the channel is busy;
  • Step 306 After the second station waits for the SIFS after receiving the Sounding Poll, select the idle channel reply channel sounding feedback Sounding Feedback according to the idle channel assessment result; and access the AP after receiving the channel feedback information of the second station. Continue to communicate with the rest of the site in accordance with the communication method with the second site.
  • the difference between this embodiment and Embodiment 2 is that the NDPA frame sent by the access point AP is not the first frame.
  • This embodiment is a combination of the foregoing embodiments, that is, when the access point AP sends the NDPA frame and the Sounding Poll in the non-HT duplicate format, the receiver needs to perform CSA detection on the idle channel in the PIFS; when the sender adopts the HT or VHT format When sending an NDPA frame and a Sounding Poll, the receiver does not need to perform CCA detection for the idle channel assessment in the SIFS, that is, the receiver decides whether to enable the idle channel assessment CCA detection according to the system configuration.
  • the receiver does not perform the idle channel assessment CCA detection regardless of whether the format of the radio frame sent by the sender is the HT or VHT format or the non-HT duplicate format, and the difference between the present invention and the prior art is that Before sending the NDPA frame and the Sounding Poll in the non-HT duplicate format, the party needs to vacate the PIFS to allow the receiver to perform the CCA detection of the idle channel during this period, and the receiver performs the CCA detection of the idle channel in the PIFS. Solve the problem of basic service set overlap and feedback channel bandwidth selection in the case of transmitting radio frames in the non-HT duplicate format.
  • the present invention further provides a feedback system for channel feedback information.
  • the system includes:
  • the sender 310 is configured to send a radio frame for requesting channel feedback information; the sender 310 needs to leave at least a specified interframe space before transmitting the radio frame for requesting channel feedback information, where the specified interframe space
  • the interval is used by the receiver for idle channel assessment detection, which is at least one point cooperative function interframe space PIFS;
  • the receiver 320 is configured to, after receiving the radio frame for requesting channel feedback information sent by the sender, select an appropriate bandwidth according to the idle channel assessment result to feed back the channel information to the sender.
  • the receiver 320 further includes:
  • the evaluation module 321 is configured to perform idle channel assessment detection on the subchannels within a specified interframe interval before the sender 310 sends the radio frame for requesting channel feedback information;
  • the determining module 322 is configured to determine, according to the idle channel assessment result of the assessment module 321 , whether there is an idle subchannel;
  • the feedback module 323 is configured to select a suitable bandwidth to send channel feedback information to the sender according to the judgment result of the determining module 322.
  • the radio frame sent by the sender for requesting channel feedback information is a radio frame of a non-high-throughput copy format
  • the radio frame of the non-high-throughput copy format is specifically an empty packet to advertise an NDPA frame or a Detector. Listen to the Sounding Poll frame.
  • the receiver performs the idle channel assessment detection before transmitting the channel feedback information, so that the channel feedback information can be selected to be idle and conforms to the bandwidth requirement of the protocol. Therefore, the present invention can avoid the interference problem caused by the overlapping of the basic service set, and also solve the problem. The problem of feedback channel bandwidth selection.

Abstract

本发明公开了一种信道反馈信息的传输方法及系统，技术方案为：发送方在发送用于请求信道反馈信息的无线帧之前至少空出指定的帧间间隔，用于接收方在指定的帧间间隔内进行空闲信道评定检测，接收方收到发送方发送的用于请求信道反馈信息的无线帧后，根据空闲信道评定检测结果选择合适的带宽向发送方发送信道反馈信息。由于接收方在发送信道反馈信息之前进行空闲信道评定检测，从而能选择空闲且符合协议要求的带宽发送信道反馈信息，因此本发明能够避免基本服务集重叠导致的干扰问题，同时也解决了反馈信道带宽选择的问题。

Description

一种信道反馈信息的传输方法及系统 技术领域
本发明涉及通信领域， 尤其涉及一种信道反馈信息的传输方法及系统。 背景技术
目前， 在无线网络领或， 无线局或网 （Wireless Local Access Network,
WLAN )快速发展， 对 WLAN覆盖的需求要求日益增长， 对吞吐量的要求 亦越来越高。 电气和电子工程师协会工业规范 IEEE802.il组中， 先后定义 T 802.11a, 802.11b, 802.11g等一系列标准最普通的 WLAN技术， 随后又 陆续出现了其他任务组， 致力于发展涉及现有 802.11技术改进的规范， 例 如， 802.11η任务组提出高吞吐量（ High throughput, HT ) 的要求， 支持高 达 600Mbps的数据速率， 802.11ac任务组进一步提出超高吞吐量（ Very High throughput, VHT ) 的概念， 通过引入更大的信道带宽将数据速率提升到 lGbps0
802.11中， 一个接入点 （Access Point, AP ) 以及与 AP相关联的多个 站点 （Station, STA )组成了一个基本服务集（Basic Service Set, BSS )。 802.11 定义了两种操作模式： 分布式协调功能 （Distributed Coordination Function, DCF )和点协调功能（ Point Coordination Function, PCF ), 以及 针对这两种操作模式的改进： 增强型分布式协调访问功能 （Enhanced Distributed Channel Access , EDCA ) 和混合协调功能控制信道访问功能 ( Hybrid Coordination function Controlled channel Access, HCCA )。 其中, DCF是最基本的操作模式， 利用带有沖突避免的载波侦听多路访问机制 CSMA/CA ( CSMA with Collision Avoidance )使多个站点共享无线信道。 EDCA是增强型操作模式， 利用 CSMA/CA机制， 使多个不同优先级队列 共享无线信道， 并预约一个传输机会 ( Transmission Opportunity, TXOP )。 预约一个传输机会即预约了一段传输时长（ TXOP Duration )。
现有技术中， 为了进行信道信息收集定义了新的帧交换序列。 具体为， 发送方发送空数据包通告 （ Null Data Packet Announcement, NDPA ) 帧并 在 NDPA发送结束的短帧间间隔 (Short InterFrame Space, SIFS)后发送空数 据包 （ Null Data Packet, NDP ), 默认 NDPA里指示的第一个接收方在收 完 NDPA和 NDP的 SIFS后回复信道反馈信息（ Sounding Feedback )。 如果 有多个信道反馈方， 在第一个反馈方默认反馈信道信息后， 发送方等待一 个 SIFS, 再依次向其他接收方轮询 (Sounding Poll)来反馈信道信息， 如图 1 所示。其中发送方所发送的 NDPA、 NDP以及 Sounding Poll帧的带宽是相 等的。 在接收方向发送方反馈信道信息的时候， 采用的传输带宽可以小于 等于之前发送方向接收方发送的帧所采用的带宽， 如何确定具体采用的带 宽是本发明要解决的问题之一。 另外， 发送方为了进行信道信息收集所发 送的 NDPA、 NDP以及 Sounding Poll帧所采用的格式可以采用 non-HT( non High Throughput ), HT、 VHT ( Very High Throughput )三种格式， 当采用 non-HT时， 对于大于 20MHz的带宽发送方会以 20MHz为单位进行复制 ( duplicate ), 每 20MHz信道为一个子信道， 其中有一个 20MHz带宽的子 信道为主信道， 其余子信道为辅信道， 现有技术中接收方只对主信道传输 的帧进行解码解析， 如果此帧的 TA (发送地址）域的 I/G比特位为 1 , 则 接收方通过该帧 SERVICE域中的带宽指示比特来判断发送方的发送带宽， 之后向发送方发送信道测量信息。 如果此帧的 TA (发送地址）域的 I/G比 特位为 0, 则接收方认为发送方的发送带宽为主信道带宽。 由于接收方不进 行信道状态检测， 这样会存在基本服务集重叠 （Overlapping Basic Service Set, OBSS )所造成干扰问题， 即接收方在向发送方反馈信道信息时， 会对 其周边发送方无法探知的隐藏站点造成干扰。 发明内容
有鉴于此， 本发明的主要目的在于提供一种信道反馈信息的传输方法 及系统， 应用于超高吞吐量 VHT无线局域网系统中， 用于解决接收方在反 馈信道信息时的带宽选择的问题， 以及由于接收方不进行空闲信道评定 CCA检测， 在基本服务集重叠的情况下， 存在干扰的问题。
为达到上述目的， 本发明的技术方案是这样实现的：
一种信道反馈信息的传输方法， 该方法包括：
在超高吞吐量 VHT的无线局域网系统中，接收方收到发送方发送的用 于请求信道反馈信息的无线帧后， 根据空闲信道评定检测结果选择合适的 带宽向发送方发送信道反馈信息。
进一步地， 所述发送方在发送用于请求信道反馈信息的无线帧之前至 少要空出指定的帧间间隔， 接收方在所述指定的帧间间隔内进行空闲信道 评定检测。
进一步地， 所述接收方根据空闲信道评定检测结果选择合适的带宽向 发送方发送信道反馈信息具体为：
所述接收方在发送方发送用于请求信道反馈信息的无线帧之前的指定 的帧间间隔内， 对子信道进行空闲信道评定检测；
当接收方根据空闲信道评定检测结果判断到有空闲子信道时， 接收方 选择合适的带宽向发送方发送信道反馈信息。
进一步地， 所述发送方发送的用于请求信道反馈信息的无线帧为非高 吞吐量复制格式的无线帧。 所述非高吞吐量复制格式的无线帧具体为空数 据包通告 NDPA帧或侦听轮询 Sounding Poll帧。
进一步地，所述指定的帧间间隔至少为一个点协作功能帧间间隔 PIFS。 基于本发明实施例， 本发明还提出另一种信道反馈信息的传输方法， 该方法包括： 在超高吞吐量 VHT的无线局域网系统中， 发送方在发送用于请求信道 反馈信息的无线帧之前至少要空出指定的帧间间隔， 所述指定的帧间间隔 用于接收方进行空闲信道评定检测；
发送方在发送用于请求信道反馈信息的无线帧之后接收对端发送的信 道反馈信息。
基于本发明实施例， 本发明还提出一种信道反馈信息的传输系统， 该 系统包括：
发送方， 用于发送用于请求信道反馈信息的无线帧；
接收方， 用于在收到发送方发送的用于请求信道反馈信息的无线帧后， 根据空闲信道评定检测结果选择合适的带宽向发送方发送信道反馈信息。
进一步地， 所述发送方在发送用于请求信道反馈信息的无线帧之前至 少要空出指定的帧间间隔， 接收方在所述指定的帧间间隔内进行空闲信道 评定检测。
进一步地， 所述接收方包括：
评定模块， 用于在发送方发送用于请求信道反馈信息的无线帧之前的 指定的帧间间隔内， 对子信道进行空闲信道评定检测；
判断模块， 用于根据评定模块的空闲信道评定检测结果判断是否有空 闲子信道；
反馈模块， 用于根据判断模块的判断结果， 选择合适的带宽向发送方 发送信道反馈信息。
本发明中， 发送方在发送用于请求信道反馈信息的无线帧之前至少要 空出指定的帧间间隔， 用于接收方在指定的帧间间隔内进行空闲信道评定 检测， 接收方收到发送方发送的用于请求信道反馈信息的无线帧后， 根据 空闲信道评定检测结果选择合适的带宽向发送方发送信道反馈信息； 由于 接收方在发送信道反馈信息之前进行空闲信道评定检测， 从而能选择空闲 且符合协议要求的带宽发送信道反馈信息， 因此能够避免基本服务集重叠 导致的干扰问题， 同时也解决了反馈信道带宽选择的问题。 附图说明
图 1为现有技术中信道反馈信息的传输方法的流程图；
图 2为本发明实施例 1提供的信道反馈信息的传输方法的流程图； 图 3为本发明实施例 5提供的信道反馈信息的传输系统的功能模块结 构图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。 需要说明的是， 在不沖突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。
图 2为本发明提供的信道反馈信息的反馈方法的方法流程图， 该方法 应用于在超高吞吐量 VHT的无线局域网系统中， 包括如下步驟；
步驟 201、 发送方发送用于请求信道反馈信息的无线帧给接收方； 进一步地， 发送方在发送用于请求信道反馈信息的无线帧之前至少要 空出指定的帧间间隔， 该指定的帧间间隔至少为一个点协作功能 （Point Coordination Function, PCF ) 帧间间隔（ PCF InterFrame Space, PIFS ); 进一步地， 所述发送方发送的用于请求信道反馈信息的无线帧为非高 吞吐量复制（non-HT duplicate )格式的无线帧， 具体为空数据包通告 NDPA 帧、 或空数据包 NDP帧、 或侦听轮询 Sounding Poll帧。
步驟 202、 接收方收到发送方发送的用于请求信道反馈信息的无线帧 后， 根据空闲信道评定检测结果选择合适的带宽来向发送方反馈信道信息。
进一步地， 在发送方发送用于请求信道反馈信息的无线帧之前的指定 的帧间间隔内， 接收方对子信道进行空闲信道评定检测， 并依据空闲信道 评定检测结果判断是否有可用的空闲子信道， 如果有空闲子信道， 且所述 空闲子信道符合反馈信道信息对带宽种类的要求， 则接收方选择符合反馈 信道信息对带宽种类的带宽来反馈信道信息。 所述反馈信道信息对带宽种 类的要求主要指现有技术规定只能选择 20MHZ、 40MHZ、 80MHZ 或 160MHZ四种带宽用于反馈信道信息。
实施例 1
该实施例中，一个或多个站点通过接入点 AP接入网络，基于本发明提 供的信道反馈信息的传输方法， 该实施例的步驟如下；
步驟 101、 接入点 AP发送 VHT或 HT格式 NDPA帧， 且该 NDPA帧 为首帧，在发送完 NDPA帧后间隔短帧间间隔（ Short InterFrame Space , SIFS ) 后， 发送 NDP帧给其控制和管理的站点；
步驟 102、所述 NDPA首帧里指示的第一个站点在收完 NDPA帧和 NDP 帧后， 间隔 SIFS 后， 选择空闲的信道回复信道侦听反馈 ( Sounding Feedback );
由于所述 NDPA帧的格式为 VHT或 HT格式， 因此， 第一个站点可按 现有协议直接选择空闲信道回复信道侦听反馈， 不需要进行空闲信道评定 ( Clear Channel Assessment, CCA )检;则；
步驟 103、接入点 AP在收完第一个站点的信道侦听反馈后， 等待 PIFS 后向第二个站点发送 non-HT duplicate格式的侦听轮询 Sounding Poll;
步驟 104、第二个站点在接入点 AP向其发送 Sounding Poll之前的 PIFS 内， 进行空闲信道评定检测 CCA, 获得自身的信道状态信息；
步驟 105、 第二个站点接收 Sounding Poll, 并在接收完 Sounding Poll 后间隔 SIFS后， 根据空闲信道评定检测结果选择空闲的信道回复信道侦听 反馈 Sounding Feedback;
在收完第二个站点的信道反馈信息后接入点 AP按照与第二个站点的 通信方法继续向其余站点进行通信。
该实施例中， 在接入站点 AP向下属站点发送 non-HT duplicate格式的 侦听轮询 Sounding Poll触发下属站点向接入站点 AP反馈信道侦听反馈时， 其下属站点在反馈之前首先进行空闲信道评定检测， 然后再依据评定结果 选择空闲信道反馈 Sounding Feedback。 由于站点在反馈 Sounding Feedback 之前进行了空闲信道评定检测， 因此避免了基本服务集重叠导致干扰的问 题， 同时也解决了反馈信道带宽选择的问题。
实施例 2
该实施例中，一个或多个站点通过接入点 AP接入网络，基于本发明提 供的信道反馈信息的传输方法， 该实施例的步驟如下；
步驟 201、 接入点 AP发送 non-HT duplicate格式的 NDPA为首帧， 并 在 NDPA发送结束后间隔 SIFS后发送 NDP帧；
步驟 202、 NDPA帧里指示的第一个站点在接入点 AP发送 NDPA之前 的 PIFS内进行空闲信道评定 CCA检测， 判断自己信道忙闲；
步驟 203、第一个站点接收接入点 AP发送的 NDPA帧，并在收完 NDPA 帧和 NDP帧等待 SIFS后， 根据空闲信道评定检测结果选择空闲的信道回 复信道侦听反馈 Sounding Feedback。
步驟 204、 接入点 AP在收完第一个站点的信道侦听反馈后， 等待一个 PIFS后向第二个站点发送 non-HT duplicate格式的 Sounding Poll;
步驟 205、 第二个站点在接入点 AP发送 Sounding Poll之前的 PIFS内 进行空闲信道评定 CCA检测， 判断自己信道忙闲；
步驟 206、 第二个站点在收完 Sounding Poll等待 SIFS后， 根据空闲信 道评定检测结果选择空闲的信道回复信道侦听反馈 Sounding Feedback; 在收完第二个站点的信道反馈信息后接入点 AP按照与第二个站点的 通信方法继续向其余站点进行通信。 该实施例与实施例 1的区别在于， 接入点 AP发送的 NDPA首帧也采 用 non-HT duplicate格式， 第一个站点在反馈信道侦听反馈之前也进行空闲 信道评定检测 ,从而解决了在 NDPA首巾贞也采用 non- HT duplicate格式的情 况下， 基本服务集重叠及反馈信道带宽选择的问题。
实施例 3
该实施例中， 多个站点通过接入点 AP接入网络，基于本发明提供的信 道反馈信息的传输方法， 该实施例的步驟如下；
步驟 301、 在一个传输机会（Transmission Opportunity, TXOP ) 内， 接 入点 ΑΡ等待一个 PIFS后发送 non-HT duplicate格式的 NDPA帧，并在 NDPA 发送结束间隔 SIFS后发送 NDP帧；
该实施例中， 接入点 AP发送的 non-HT duplicate格式的 NDPA帧为非 首帧；
步驟 302、 NDPA帧里指示的第一个站点在接入点 AP发送 NDPA之前 的 PIFS内进行空闲信道评定 CCA检测， 判断自己信道忙闲；
步驟 303、第一个站点接收接入点 AP发送的 NDPA帧，并在收完 NDPA 帧和 NDP帧等待 SIFS后， 根据空闲信道评定检测结果选择空闲的信道回 复信道侦听反馈 Sounding Feedback;
步驟 304、 接入点 AP在收完第一个站点的信道侦听反馈后， 等待一个 PIFS后向第二个站点发送 non-HT duplicate格式的 Sounding Poll;
步驟 305、 第二个站点在接入点 AP发送 Sounding Poll之前的 PIFS内 进行空闲信道评定 CCA检测， 判断自己信道忙闲；
步驟 306、 第二个站点在收完 Sounding Poll等待 SIFS后， 根据空闲信 道评定检测结果选择空闲的信道回复信道侦听反馈 Sounding Feedback; 在收完第二个站点的信道反馈信息后接入点 AP按照与第二个站点的 通信方法继续向其余站点进行通信。 该实施例与实施例 2的区别在于， 接入点 AP发送的 NDPA帧为非首 帧。
实施例 4
该实施例为上述实施例的综合， 即当接入点 AP采用 non-HT duplicate 格式发送 NDPA帧及 Sounding Poll时，接收方需要在 PIFS进行空闲信道评 定 CCA检测；当发送方采用 HT或 VHT格式发送 NDPA帧及 Sounding Poll 时， 接收方在 SIFS不需要进行空闲信道评定 CCA检测， 即接收方根据系 统配置来决定是否开启空闲信道评定 CCA检测。
现有技术中，接收方不管发送方发送的无线帧的格式是 HT或 VHT格 式还是 non-HT duplicate格式， 都不进行空闲信道评定 CCA检测，， 本发明 与现有技术的区别在于，在发送方发送 non-HT duplicate格式的 NDPA帧和 Sounding Poll之前， 都需要空出 PIFS让接收方在这段时间内进行空闲信道 评定 CCA检测， 接收方在这段 PIFS内进行空闲信道评定 CCA检测， 从而 解决在采用 non-HT duplicate格式发送无线帧的情况下，基本服务集重叠及 反馈信道带宽选择的问题。
实施例 5
基于本发明提供的方法， 本发明还提出一种信道反馈信息的反馈系统， 如图 3所示， 该系统包括：
发送方 310, 用于发送用于请求信道反馈信息的无线帧； 所述发送方 310 在发送用于请求信道反馈信息的无线帧之前至少要空出指定的帧间间 隔， 所述指定的帧间间隔用于接收方进行空闲信道评定检测， 其至少为一 个点协作功能帧间间隔 PIFS;
接收方 320,用于在收到发送方发送的用于请求信道反馈信息的无线帧 后， 根据空闲信道评定检测结果选择合适的带宽来向发送方反馈信道信息。
所述接收方 320进一步包括： 评定模块 321 ,用于在发送方 310发送用于请求信道反馈信息的无线帧 之前的指定的帧间间隔内， 对子信道进行空闲信道评定检测；
判断模块 322,用于根据评定模块 321的空闲信道评定检测结果判断是 否有空闲子信道；
反馈模块 323, 用于根据判断模块 322的判断结果， 选择合适的带宽向 发送方发送信道反馈信息。
进一步地， 所述发送方发送的用于请求信道反馈信息的无线帧为非高 吞吐量复制格式的无线帧， 所述非高吞吐量复制格式的无线帧具体为空数 据包通告 NDPA帧或侦听轮询 Sounding Poll帧。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于 本领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明 的保护范围之内。 工业实用性
本发明中， 接收方在发送信道反馈信息之前进行空闲信道评定检测， 从而能选择空闲且符合协议要求的带宽发送信道反馈信息， 因此本发明能 够避免基本服务集重叠导致的干扰问题， 同时也解决了反馈信道带宽选择 的问题。

Claims

权利要求书
1、 一种信道反馈信息的传输方法， 该方法包括：
在超高吞吐量 VHT的无线局域网系统中，接收方收到发送方发送的用 于请求信道反馈信息的无线帧后， 根据空闲信道评定检测结果选择合适的 带宽向发送方发送信道反馈信息。
2、 根据权利要求 1所述的方法， 其中， 所述方法还包括：
发送方在发送用于请求信道反馈信息的无线帧之前至少要空出指定的 帧间间隔， 接收方在所述指定的帧间间隔内进行空闲信道评定检测。
3、 根据权利要求 2所述的方法， 其中， 所述接收方根据空闲信道评定 检测结果选择合适的带宽向发送方发送信道反馈信息具体为：
所述接收方在发送方发送用于请求信道反馈信息的无线帧之前的指定 的帧间间隔内， 对子信道进行空闲信道评定检测；
当接收方根据空闲信道评定检测结果判断到有空闲子信道时， 接收方 选择合适的带宽向发送方发送信道反馈信息。
4、 根据权利要求 1所述的方法， 其中， 所述发送方发送的用于请求信 道反馈信息的无线帧为非高吞吐量复制格式的无线帧。
5、 根据权利要求 4所述的方法， 其中， 所述非高吞吐量复制格式的无 线帧具体为空数据包通告 NDPA帧或侦听轮询 Sounding Poll帧。
6、 根据权利要求 2所述的方法， 其中， 所述指定的帧间间隔至少为一 个点协作功能帧间间隔 PIFS。
7、 一种信道反馈信息的传输方法， 该方法包括：
在超高吞吐量 VHT的无线局域网系统中， 发送方在发送用于请求信道 反馈信息的无线帧之前至少要空出指定的帧间间隔， 所述指定的帧间间隔 用于接收方进行空闲信道评定检测； 发送方在发送用于请求信道反馈信息的无线帧之后接收对端发送的信 道反馈信息。
8、 根据权利要求 7所述的方法， 其中， 所述对端发送的信道反馈信息 具体为：
所述接收方收到发送方发送的用于请求信道反馈信息的无线帧后， 根 据在所述指定的帧间间隔内的空闲信道评定检测结果选择合适的带宽向发 送方发送的信道反馈信息。
9、 根据权利要求 7所述的方法， 其中， 所述发送方发送的用于请求信 道反馈信息的无线帧为非高吞吐量复制格式的空数据包通告 NDPA帧或侦 听轮询 Sounding Poll帧。
10、 根据权利要求 7所述的方法， 其中， 所述指定的帧间间隔至少为 一个点协作功能帧间间隔 PIFS。
11、 一种信道反馈信息的传输系统， 该系统包括：
发送方， 用于发送用于请求信道反馈信息的无线帧；
接收方， 用于在收到发送方发送的用于请求信道反馈信息的无线帧后， 根据空闲信道评定检测结果选择合适的带宽向发送方发送信道反馈信息。
12、 根据权利要求 11所述的系统， 其中， 所述发送方在发送用于请求 信道反馈信息的无线帧之前至少要空出指定的帧间间隔， 接收方在所述指 定的帧间间隔内进行空闲信道评定检测。
13、 根据权利要求 11所述的系统， 其中， 所述接收方包括：
评定模块， 用于在发送方发送用于请求信道反馈信息的无线帧之前的 指定的帧间间隔内， 对子信道进行空闲信道评定检测；
判断模块， 用于根据评定模块的空闲信道评定检测结果判断是否有空 闲子信道；
反馈模块， 用于根据判断模块的判断结果， 选择合适的带宽向发送方 发送信道反馈信息。
14、 根据权利要求 11所述的系统， 其中， 所述发送方发送的用于请求 信道反馈信息的无线帧为非高吞吐量复制格式的无线帧。
15、 根据权利要求 14所述的系统， 其中， 所述非高吞吐量复制格式的 无线帧具体为空数据包通告 NDPA帧或侦听轮询 Sounding Poll帧。
16、 根据权利要求 12所述的系统， 其中， 所述指定的帧间间隔至少为 一个点协作功能帧间间隔 PIFS。
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Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9622262B2 (en) 2013-05-03 2017-04-11 Qualcomm Incorporated Transmit opportunity (TXOP) based channel reuse
US9537688B2 (en) * 2013-07-05 2017-01-03 Qualcomm Incorporated Methods and apparatus for clear channel assessment
DE102013214005A1 (de) * 2013-07-17 2015-02-19 Zf Friedrichshafen Ag Verfahren und Vorrichtung zum Aussenden von Daten und Verfahren und Vorrichtung zum Aussenden eines Kennungssignals
CN105812295B (zh) * 2014-12-30 2020-05-12 中兴通讯股份有限公司 数据传输方法和站点
EP3242527A4 (en) * 2014-12-30 2018-08-29 LG Electronics Inc. Method and device for performing uplink transmission after receiving trigger frame in wireless lan system
GB2534865A (en) * 2015-01-30 2016-08-10 Nec Corp Communication system
CN107251470B (zh) * 2015-03-04 2021-08-27 英特尔公司 用于无线网络中的正交频分多址的感测和延迟
US20160360397A1 (en) * 2015-06-02 2016-12-08 Qualcomm Incorporated Color coding for data confirmation signals
CN106341828B (zh) * 2015-07-10 2020-04-03 华为技术有限公司 一种信道测量方法及sta
CN106559844B (zh) 2015-09-25 2020-03-24 电信科学技术研究院 一种上行传输资源调度及上行传输方法、装置
CN106793096A (zh) * 2015-11-20 2017-05-31 华为技术有限公司 一种信道资源指示方法及装置
US10517006B2 (en) * 2016-04-13 2019-12-24 Qualcomm Incorporated Techniques for reporting channel feedback in wireless communications
CN109428747B (zh) * 2017-08-25 2022-03-04 展讯通信（上海）有限公司 本地振荡器带宽调整方法、接收机、计算机介质及系统
US20200396765A1 (en) * 2017-11-13 2020-12-17 Nec Corporation Methods and devices for data transmission on unlicensed band in a wireless communication system
CN111950941B (zh) * 2020-10-13 2021-02-12 垒途智能教科技术研究院江苏有限公司 一种提高交互体验的工业设计系统及其交互方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101502064A (zh) * 2006-11-10 2009-08-05 美国博通公司 连续自我清除发送消息程序
CN102013959A (zh) * 2010-12-01 2011-04-13 北京新岸线无线技术有限公司 一种实现多用户调度的通信方法及无线通信系统
WO2011060326A1 (en) * 2009-11-13 2011-05-19 Marvell World Trade Ltd. Multi-channel wireless communications
US20110116487A1 (en) * 2009-11-13 2011-05-19 Interdigital Patent Holdings, Inc. Control signaling in wireless communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101502064A (zh) * 2006-11-10 2009-08-05 美国博通公司 连续自我清除发送消息程序
WO2011060326A1 (en) * 2009-11-13 2011-05-19 Marvell World Trade Ltd. Multi-channel wireless communications
US20110116487A1 (en) * 2009-11-13 2011-05-19 Interdigital Patent Holdings, Inc. Control signaling in wireless communications
CN102013959A (zh) * 2010-12-01 2011-04-13 北京新岸线无线技术有限公司 一种实现多用户调度的通信方法及无线通信系统

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