WO2012155741A1 - 无线帧发送的方法及装置、通信网元 - Google Patents

无线帧发送的方法及装置、通信网元 Download PDF

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Publication number
WO2012155741A1
WO2012155741A1 PCT/CN2012/074148 CN2012074148W WO2012155741A1 WO 2012155741 A1 WO2012155741 A1 WO 2012155741A1 CN 2012074148 W CN2012074148 W CN 2012074148W WO 2012155741 A1 WO2012155741 A1 WO 2012155741A1
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Prior art keywords
frame
channel information
access
access category
data
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PCT/CN2012/074148
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English (en)
French (fr)
Inventor
韩志强
姜静
孙波
张力
邢卫民
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中兴通讯股份有限公司
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Priority to US14/118,893 priority Critical patent/US9231747B2/en
Publication of WO2012155741A1 publication Critical patent/WO2012155741A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst

Definitions

  • the present invention relates to a radio frame transmission technique, and in particular, to a method and apparatus for radio frame transmission for channel information measurement, and a communication network element.
  • WLANs wireless local area networks
  • IEEE802.il task group of the Institute of Electrical and Electronics Engineers a series of standard WLAN technologies such as 802.11a, 802.11b, and 802.11g have been defined, followed by other task groups, which are dedicated to the development of existing 802.11 technologies.
  • Improved specifications for example, the 802.11n task group proposed high-throughput (HT) requirements, supporting data rates up to 600Mbps, and the 802.11ac task group further proposed the concept of VHT (Very High Throughput), by introducing more Large channel bandwidth increases data rate to 1Gbps 0
  • an access point AP, Access Point
  • multiple sites STA, Station
  • BSS Basic Service Set
  • the 802.11 task group defines two modes of operation: Distributed Coordination Function (DCF) and Point Coordination Function (PCF), and improvements for both modes of operation: Enhanced Distributed Coordination Access (EDCA, Enhanced Distributed Channel Access) and hybrid coordination function control channel access
  • DCF Distributed Coordination Function
  • PCF Point Coordination Function
  • Both DCF and EDCA use CSMA/CA (CSMA with Collision Avoidance) with collision avoidance to enable multiple sites to share wireless channels.
  • CSMA/CA CSMA with Collision Avoidance
  • HCCA CSMA with Collision Avoidance
  • the system is divided into four access categories (Access Category), which are AC-VO, AC-VI, AC-BE and AC-BK, and user priority of MAC Service Data Unit (MSDU).
  • MSDU MAC Service Data Unit
  • User Priority has a mapping relationship with the four ACs, and each AC corresponds to a set of EDCA parameter sets.
  • the radio frame with certain priority requirements uses the parameter set of the AC corresponding to the UP to compete for the channel, and obtains the transmission opportunity (TXOP, Transmission Opportunity I.
  • TXOP Transmission Opportunity
  • the basic process of obtaining the transmission opportunity with different priority access is: When the channel is idle, different backoff intervals are used plus any contention backoff window to access the channel to reduce collisions.
  • MIMO Multiple Input Multiple
  • the initiator needs to measure the channel condition of one or more receivers, and configure transmission parameters according to the measured channel information.
  • FIG. 1 shows the processing flow of channel information feedback.
  • the channel information feedback process between beamformer and beamformee is: beamformer sends a null data packet announcement (NDPA, Null Data Packet Announcement) frame for notifying beamformee for channel measurement.
  • NDPA null Data Packet Announcement
  • the short interframe space (SIFS, Short Interframe Space) is sent to send a null data frame (NDP, Null Data Packet).
  • NDP Null Data Packet
  • the NDPA frame carries information of one or more beamformees that need to perform channel measurement.
  • the first beamformee in the NDPA waits for the SIFS interval to respond to the VHT Compressed Beamforming frame. If NDPA carries multiple beamformee letters The remaining beamformee feeds back the channel measurement feedback report after receiving the beamformer's Polling Poll.
  • RTS Request To Send
  • CTS Clear To Send
  • the channel information measurement is introduced, the prior art does not specify which access class is used for the notification frame (for example, NDPA) for channel information measurement, which undoubtedly causes inconvenience to the radio frame for transmitting the channel information measurement. Data cannot be transmitted because the channel information is not known. Summary of the invention
  • the main object of the present invention is to provide a method and apparatus for transmitting a radio frame, and a communication network element, which can use an access category for a corresponding radio frame when performing radio frame transmission for channel information measurement. Smooth measurement of channel information.
  • a method for transmitting a wireless frame comprising:
  • Wireless frames are sent using any access category.
  • the radio frame is a first frame of a frame exchange sequence for performing channel information measurement and reporting, and is a notification frame for notifying a channel information feedback party.
  • the method further includes:
  • the radio frame uses any access category, which is:
  • the first frame is transmitted using the access category.
  • the radio frame uses any access category, which is: When there is no data transmission in the data queue of two or more access categories, the first frame is transmitted using the access class with the highest priority.
  • the first frame is an NDPA frame or a Sounding Poll frame.
  • the method further includes:
  • the RTS or CTS is sent by using the same access class sender as the first frame.
  • the access category includes at least one of the following:
  • a device for transmitting a wireless frame comprising a selecting unit and a sending unit, wherein:
  • a selecting unit configured to select an arbitrary access category for the first frame used for channel information measurement
  • a sending unit configured to send the first frame
  • the selecting unit is further configured to select, in a multi-frame exchange sequence of channel information measurement, another access frame that belongs to the same sender as the first frame, and select the same access category as the first frame.
  • the selecting unit is further configured to: when no data is sent in a data queue of an access category, select the access category, and send the first frame by using the sending unit.
  • the selecting unit does not send data in the data queue of the two or more access categories
  • the access class with the highest priority is selected, and the frame is sent by the sending unit.
  • the first frame is an NDPA frame or a Sounding Poll frame.
  • a communication network element having the apparatus described above.
  • the invention sets the access category for the first frame of the channel information measurement, ensures the channel information measurement, the subsequent transmission of the subsequent radio frame of the frame exchange sequence, ensures the smooth progress of the channel information measurement, and performs the communication data according to the acquired channel information. Send.
  • the invention ensures the support of each communication network element for MIMO and beamforming, and effectively complements the existing protocol.
  • Figure 1 is a flow chart of processing channel information feedback
  • FIG. 2 is a schematic structural diagram of a device for transmitting a radio frame according to the present invention. detailed description
  • the basic idea of the present invention is: setting an access category for the first frame of the channel information measurement, thereby ensuring the channel information measurement, the subsequent transmission of the subsequent radio frame of the frame exchange sequence, ensuring the smooth progress of the channel information measurement, and the data transmission network element
  • the communication data can be smoothly transmitted according to the acquired channel information.
  • the method for transmitting a radio frame of the present invention mainly uses the arbitrary access category to transmit the radio frame in the channel information measurement process.
  • the above radio frame refers to a first frame in a multi-frame exchange sequence for performing channel information measurement and reporting, and is used to notify a notification frame of a channel information feedback party.
  • other radio frames belonging to the same sender as the radio frame use the same access class as the radio frame.
  • Any of the above access categories may be any of AC_VI, AV_VO, AC_BE, and AC_BK.
  • RTS or CTS Prior to the channel information measurement and reported multi-frame exchange sequence, other frame exchanges (RTS or CTS) are used using the same access class as the above-described radio frame.
  • the AP randomly selects an access category to send NDPA. For example, AC_BE is randomly selected. After the AC_BE competes for the channel, the NDPA is sent to measure the channel information of STA1 and STA2, and the subsequent Sounding Poll frame uses the same access category as the NDPA, in order to make the data transmission in the TXOP more reliable.
  • the RTS or CTS can be sent before the channel information measurement.
  • the RTS or CTS uses the same access class AC_BE as NDPA.
  • This embodiment is an embodiment of a transmission method in the channel information measurement process using the present invention.
  • the transmission in the channel information measurement process in this embodiment mainly includes the following steps: Assume that within one BSS, there are six stations: one AP and five STAs (STA1, STA2, STA3, STA4, STA5). At a certain moment, there is no data to be sent in each access category, but channel information measurement needs to be performed on stations STA1 and STA2.
  • the AP preferably sends the NDPA using the highest priority access class AC_VO. After AC_VO competes for the channel, the NDPA is sent to perform channel information measurement of STA1 and STA2, and the subsequent Sounding Poll frame uses the same access category as NDPA. In order to make the data transmission in the TXOP more reliable, it can be sent before the channel information measurement.
  • RTS or CTS The RTS or CTS uses the same access category AC_VO as NDPA.
  • the access categories AC_VO, AC_BE, and AC_BK of the AP have data to be transmitted, and the AP needs to perform channel information measurement on the STA3 of the station.
  • the AP sends NDPA using the access category AC_VI.
  • AC_VI contends to the channel
  • NDPA is sent to perform channel information measurement of STA3.
  • the access category AC_VI of the AP has the data of the destination address STA1, and the access category AC_VI competes for the channel. If the AP does not have the channel information of STA1, the NDPA may be sent to measure the channel information of STA1, and then according to the measured channel information. Select the appropriate transmission parameters to transmit the data of STA1.
  • the AP's access category AC_VI The target site is STA1 data
  • the access class AC_VO has the target site STA2 data
  • the access class AC_BK has the target site STA3 data.
  • the AP's access category AC_VI competes for the channel, and the STA1, STA2, and STA3 data packets are sent out using MU-MIMO.
  • the STA1, STA2, and STA3 data packets are sent out using MU-MIMO.
  • channel information measurement can be performed before data transmission.
  • the AP sends the NDPA using the access category AC_VI, and starts measuring the channel information of STA1 and STA2.
  • the subsequent Sounding Poll frame also uses the access category AC_VI.
  • the RTS or CTS can be sent before the channel information measurement.
  • the RTS or CTS uses the same access class AC_VI as NDPA.
  • the apparatus for transmitting a radio frame of the present invention includes a selecting unit 20 and a transmitting unit 21, where:
  • the selecting unit 20 is configured to select an arbitrary access category for the first frame used for channel information measurement, and the sending unit 21 is configured to send the first frame.
  • the selecting unit 20 is further configured to select, in the multi-frame exchange sequence of channel information measurement, another access frame that belongs to the same sender as the first frame, and select the same access class as the first frame.
  • the selecting unit 20 is further configured to: when there is no data transmission in the data queue of a certain access category, select the access category, and send the first frame by using the sending unit 21.
  • the selection unit 20 selects the access class with the highest priority and transmits the first frame by the sending unit 21.
  • the first frame is an NDPA frame or a Sounding Poll frame.
  • the invention also describes a communication network element, which has the wireless frame transmission shown in FIG. 2 described above. Device.
  • the invention sets the access category for the first frame of the channel information measurement, ensures the channel information measurement, the subsequent transmission of the subsequent radio frame of the frame exchange sequence, ensures the smooth progress of the channel information measurement, and performs the communication data according to the acquired channel information. Send.

Description

无线帧发送的方法及装置、 通信网元 技术领域
本发明涉及一种无线帧发送技术， 尤其涉及一种用于信道信息测量的 无线帧发送的方法及装置， 以及通信网元。 背景技术
目前，在无线网络领域， 随着无线局域网（WLAN, Wireless Local Area Network ) 的快速发展， 对 WLAN覆盖的需求也日益增长， 同时， 对吞吐 量的要求也越来越高。 在电气和电子工程师协会工业规范 IEEE802.il任务 组中， 先后定义了 802.11a, 802.11b, 802.11g等一系列标准 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任务组提出了高吞吐量（HT, High Throughput )的要求， 支持高达 600Mbps的数据速率， 802.11ac任务组进一步提出了 VHT ( Very High Throughput ) 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任务组中， 一个接入点 （AP, Access Point ) 以及与 AP相关联 的多个站点（ STA, Station )组成了一个基本服务集（ BSS , Basic Service Set )。 802.11 任务组定义了两种操作模式： 分布式协调功能 （DCF, Distributed Coordination Function )和点协调功能 ( PCF, Point Coordination Function ), 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 （EDCA, Enhanced Distributed Channel Access )和混合协调功能控制信道访问功能
DCF和 EDCA 均采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。 上述两种操 作模式的区别在于， EDCA应用于具有服务质量（QoS, Quality of Service ) 要求的帧传输， HCCA应用于不要求 QoS的帧传输。 系统中划分了四个接 入类别 ( Access Category ), 分别是 AC—VO, AC—VI, AC—BE和 AC—BK, MAC服务数据单元（ MSDU, MAC Service Data Unit )的用户优先级（ UP, User Priority ) 与这四个 AC具有映射关系， 每个 AC对应一组 EDCA参数 集。 这样， 具有一定优先级要求的无线帧采用与该 UP对应的 AC的参数集 竟争信道， 获得传输机会（TXOP, Transmission Opportunity I 不同优先级 接入获得传输机会的基本过程为： 每个接入在信道空闲时， 使用不同的退 避间隔加上任意的竟争退避窗来接入信道， 以减少碰撞。
现有技术中， 引入了多输入多输出 （ MIMO , Multiple Input Multiple
Output )来改善 WLAN的传输性能。 为了保证数据能够可靠有效的发送， 发起方需要测量一个或者多个接收方的信道情况， 并根据测量得到的信道 信息， 来配置传输参数。
现有技术中， AP和 STA之间发送无线帧时，可以采用多天线和波束形 成技术， 例如， AP在进行下行 MIMO传输时， 可以通知 STA进行信道测 量， 并向 AP反馈测量结果， AP根据测量结果计算引导矩阵， 从而优化接 收端的接收。 通常， 将使用引导矩阵进行发送的一方称为 beamformer, 接 收方称为 beamformee。 图 1 为信道信息反馈的处理流程， 如图 1 所示， beamformer与 beamformee之间的信道信息反馈过程为： beamformer发送用 于通知 beamformee进行信道测量的空数据通知 （NDPA, Null Data Packet Announcement ) 帧， 在 NDPA发送结束后， 等待短帧间间隔（SIFS, Short Interframe Space )发送空数据帧 （NDP, Null Data Packet )。 NDPA帧中携 带需要进行信道测量的一个或多个 beamformee的信息， NDPA中的第一个 beamformee在收到 NDP帧后，等待 SIFS间隔回复信道测量反馈报告（ VHT Compressed Beamforming frame )。 如果 NDPA中携带了多个 beamformee信 息， 则其余的 beamformee在收到 beamformer的轮询帧 ( Sounding Poll )后 反馈信道测量反馈报告。
现有技术规定了管理帧发送时需使用 AC_VO接入类另' 当使用请求发 送（ RTS, Request To Send )或允许发送（ CTS, Clear To Send )作为帧交 换序列的第一帧时， RTS或 CTS应该继承同一交换序列中后续数据使用的 接入类别。 但是， 当引入信道信息测量后， 现有技术没有规定用于信道信 息测量的通知帧（例如 NDPA )使用何种接入类别， 这无疑对发送信道信息 测量的无线帧造成了不便， 严重时可能会因无法获知信道信息而导致数据 无法传输。 发明内容
有鉴于此， 本发明的主要目的在于提供一种无线帧发送的方法及装置、 通信网元， 在进行用于信道信息测量的无线帧发送时， 能为相应的无线帧 使用接入类别 , 保证了信道信息的顺利测量。
为达到上述目的， 本发明的技术方案是这样实现的：
一种无线帧发送的方法， 包括：
无线帧使用任意的接入类别进行发送。
优选地， 所述无线帧为用于进行信道信息测量和 ^艮告的帧交换序列的 首帧， 是用于通知信道信息反馈方的通知帧。
优选地， 所述方法还包括：
在信道信息测量的多帧交换序列中， 与所述首帧属于同一发送方的其 他无线帧使用与所述首帧相同的接入类别。
优选地， 所述无线帧使用任意的接入类别， 为：
某一接入类别的数据队列中没有数据发送时， 使用该接入类别发送所 述首帧。
优选地， 所述无线帧使用任意的接入类别， 为： 两个以上接入类别的数据队列中没有数据发送时， 使用优先级最高的 接入类别发送所述首帧。
优选地， 所述首帧为 NDPA帧或 Sounding Poll帧。
优选地， 所述方法还包括：
所述发送方发送所述首帧之前， 使用与发送所述首帧相同的接入类别 发送方发送 RTS或 CTS。
优选地， 所述接入类别包括以下至少一项：
AC—VO, AC—VI, AC—BE和 AC_BK。
一种无线帧发送的装置， 包括选择单元和发送单元， 其中：
选择单元， 用于为用于信道信息测量的首帧选用任意的接入类别； 发送单元， 用于发送所述首帧。
优选地， 所述选择单元还用于， 在信道信息测量的多帧交换序列中， 与所述首帧属于同一发送方的其他无线帧选用与所述首帧相同的接入类 别。
优选地， 所述选择单元还用于， 在某一接入类别的数据队列中没有数 据发送时， 选用该接入类别， 并通过所述发送单元发送所述首帧。
或者， 所述选择单元在两个以上接入类别的数据队列中没有数据发送 时， 选用优先级最高的接入类别， 并通过所述发送单元发送所述帧。
优选地， 所述首帧为 NDPA帧或 Sounding Poll帧。
一种通信网元， 具有权利要求上述的装置。
本发明通过为信道信息测量的首帧设置接入类别， 保证了信道信息测 量这一帧交换序列后续无线帧的顺传输， 保证了信道信息测量的顺利进行， 从而根据获取的信道信息进行通信数据的发送。 本发明保证了各通信网元 对 MIMO及波束成形的支持， 对现有协议进行了有效补充。 附图说明
图 1 为信道信息反馈的处理流程图；
图 2为本发明无线帧发送的装置的组成结构示意图。 具体实施方式
本发明的基本思想为： 为信道信息测量的首帧设置接入类别， 从而保 证了信道信息测量这一帧交换序列后续无线帧的顺传输， 保证了信道信息 测量的顺利进行， 数据发送网元能根据获取的信道信息顺利进行通信数据 的发送。
本发明无线帧发送的方法， 主要是对信道信息测量过程中的无线帧使 用任意的接入类别进行发送。 上述无线帧是指用于进行信道信息测量和报 告的多帧交换序列中的首帧， 用于通知信道信息反馈方的通知帧。 在上述 信道信息测量和报告的多帧交换序列中， 与上述无线帧属于同一发送方的 其他无线帧使用和上述无线帧相同的接入类别。 上述任意的接入类别可以 是 AC_VI、 AV_VO、 AC_BE、 AC_BK的任意一个。 在信道信息测量和报 告的多帧交换序列之前， 进行其他帧交换 ( RTS或 CTS )使用与上述无线 帧相同的接入类别。
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。
实施例一
假设在一个 BSS内，有六个站点： 一个 AP和五个 STA ( STA1、 STA2、 STA3、 STA4、 STA5 )。 AP在某一时刻， 各个接入类别中都没有数据需要 发送， 但是需要对站点 STA1、 STA2进行信道信息测量。 AP随机地选择一 个接入类别发送 NDPA, 比如随机选中的是 AC_BE。 当 AC_BE竟争到信 道后，发送 NDPA进行 STA1和 STA2的信道信息测量，后续的 Sounding Poll 帧使用和 NDPA相同的接入类别， 为了使得 TXOP内数据传输更加可靠， 可以在信道信息测量之前发送 RTS或 CTS。 RTS或 CTS使用和 NDPA相同 的接入类别 AC_BE。
实施例二
本实施例是采用本发明的一种信道信息测量过程中的传输方法的实施 例。 在本实施例中实现信道信息测量过程中的传输主要包括以下步驟： 假设在一个 BSS内，有六个站点： 一个 AP和五个 STA ( STA1、 STA2、 STA3、 STA4、 STA5 )。 AP在某一时刻， 各个接入类别中都没有数据需要 发送， 但是需要对站点 STA1、 STA2进行信道信息测量。 AP优选地使用优 先级最高的接入类别 AC_VO发送 NDPA。 当 AC_VO竟争到信道后， 发送 NDPA来进行 STA1和 STA2的信道信息测量，后续的 Sounding Poll帧使用 和 NDPA相同的接入类别， 为了使得 TXOP内数据传输更加可靠， 可以在 信道信息测量之前发送 RTS或 CTS。 RTS或 CTS使用和 NDPA相同的接入 类别 AC_VO。
实施例三
假设在一个 BSS内， 有一个 AP和任意多的 STA。 在某一时刻， AP的 接入类别 AC_VO、 AC_BE、 AC_BK中有数据待发送， AP需要对站点 STA3 进行信道信息测量。 AP使用接入类别 AC_VI发送 NDPA。 当 AC_VI竟争 到信道， 发送 NDPA来进行 STA3的信道信息测量。
实施例四
假设在一个 BSS内， 有三个站点： AP、 STA1和 STA2。 AP的接入类 别 AC_VI中有目标地址为 STA1的数据， 接入类别 AC_VI竟争到信道， 如 果 AP没有 STA1的信道信息， 可以先发送 NDPA对 STA1进行信道信息测 量， 然后根据测量的信道信息， 选择合适的传输参数来传送 STA1的数据。
实施例五
假设在一个 BSS内，有多个 STA,在某一时刻， AP的接入类别 AC_VI 中有目标站点为 STA1的数据， 接入类别 AC_VO中有目标站点为 STA2的 数据， 接入类别 AC_BK中有目标站点为 STA3的数据。 假设 AP的接入类 别 AC_VI 竟争到了信道， 将 STA1、 STA2 和 STA3 的数据打包使用 MU-MIMO发送出去。 但是没有 STA1和 STA2的信道信息或者 STA1和 STA2的信道信息已经失效。 为了保证数据可靠传输， 可以在数据传输之前 进行信道信息测量。 AP使用接入类别 AC_VI发送 NDPA, 开始测量 STA1 和 STA2的信道信息， 后续的 Sounding Poll帧也是使用接入类别 AC_VI。 为了使得 TXOP内数据传输更加可靠， 可以在信道信息测量之前发送 RTS 或 CTS。 RTS或 CTS使用和 NDPA相同的接入类别 AC_VI。
图 2为本发明无线帧发送的装置的组成结构示意图， 如图 2所示， 本 发明无线帧发送的装置包括选择单元 20和发送单元 21 , 其中：
选择单元 20, 用于为用于信道信息测量的首帧选用任意的接入类别； 发送单元 21 , 用于发送所述首帧。
上述选择单元 20还用于， 在信道信息测量的多帧交换序列中， 与所述 首帧属于同一发送方的其他无线帧选用与所述首帧相同的接入类别。
上述选择单元 20还用于， 在某一接入类别的数据队列中没有数据发送 时， 选用该接入类别， 并通过发送单元 21发送所述首帧。
或者， 上述选择单元 20在两个以上接入类别的数据队列中没有数据发 送时， 选用优先级最高的接入类别， 并通过发送单元 21发送所述首帧。
上述首帧为 NDPA帧或 Sounding Poll帧。
本领域技术人员应当理解， 图 2所示的无线帧发送的装置中各处理单 元的功能可参照前述实施例一至实施例五的相关描述而理解， 各处理单元 的功能可通过运行于处理器上的程序而实现， 也可通过具体的逻辑电路而 实现。
本发明同时记载了一种通信网元， 具有前述图 2所示的无线帧发送的 装置。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。
工业实用性
本发明通过为信道信息测量的首帧设置接入类别， 保证了信道信息测 量这一帧交换序列后续无线帧的顺传输， 保证了信道信息测量的顺利进行， 从而根据获取的信道信息进行通信数据的发送。

Claims

权利要求书
1、 一种无线帧发送的方法， 其中， 所述方法包括：
无线帧使用任意的接入类别进行发送。
2、 根据权利要求 1所述的方法， 其中， 所述无线帧为用于进行信道信 息测量的帧交换序列的首帧。
3、 根据权利要求 2所述的方法， 其中， 所述方法还包括：
在信道信息测量的多帧交换序列中， 与所述首帧属于同一发送方的其 他无线帧使用与所述首帧相同的接入类别。
4、 根据权利要求 2所述的方法， 其中， 所述无线帧使用任意的接入类 别， 为：
某一接入类别的数据队列中没有数据发送时， 使用该接入类别发送所 述首帧。
5、 根据权利要求 2所述的方法， 其中， 所述无线帧使用任意的接入类 别， 为：
两个以上接入类别的数据队列中没有数据发送时， 使用优先级最高的 接入类别发送所述首帧。
6、 根据权利要求 2所述的方法， 其中， 所述方法还包括：
发送所述首帧之前， 使用与发送所述首帧相同的接入类别发送 RTS或 CTS。
7、 根据权利要求 1至 6任一项所述的方法， 其中， 所述首帧为 NDPA 帧或 Sounding Poll帧。
8、 根据权利要求 6所述的方法， 其中， 所述接入类别包括以下至少一 项：
AC—VO, AC—VI, AC—BE和 AC_BK。
9、一种无线帧发送的装置， 其中， 所述装置包括选择单元和发送单元， 其中：
选择单元， 用于为用于信道信息测量的首帧使用任意的接入类别； 发送单元， 用于发送所述首帧。
10、 根据权利要求 9所述的装置， 其中， 所述选择单元还用于， 在信 道信息测量的多帧交换序列中， 与所述首帧属于同一发送方的其他无线帧 选用与所述首帧相同的接入类别。
11、 根据权利要求 9所述的装置， 其中， 所述选择单元还用于， 在某 一接入类别的数据队列中没有数据发送时， 选用该接入类别， 并通过所述 发送单元发送所述首帧；
或者， 所述选择单元在两个以上接入类别的数据队列中没有数据发送 时， 选用优先级最高的接入类别， 并通过所述发送单元发送所述首帧。
12、根据权利要求 9至 11任一项所述的装置，其中，所述首帧为 NDPA 帧或 Sounding Poll帧。
13、 一种通信网元， 其中， 具有权利要求 8至 11任一项所述的装置。
PCT/CN2012/074148 2011-05-13 2012-04-16 无线帧发送的方法及装置、通信网元 WO2012155741A1 (zh)

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