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WO2012149847A1 - 一种无线帧的发送方法和装置 - Google Patents

一种无线帧的发送方法和装置 Download PDF

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Publication number
WO2012149847A1
WO2012149847A1 PCT/CN2012/073351 CN2012073351W WO2012149847A1 WO 2012149847 A1 WO2012149847 A1 WO 2012149847A1 CN 2012073351 W CN2012073351 W CN 2012073351W WO 2012149847 A1 WO2012149847 A1 WO 2012149847A1
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Prior art keywords
vht
receiving end
long training
domain
ltf
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English (en)
French (fr)
Inventor
姜静
张力
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ZTE Corp
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ZTE Corp
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Priority to KR1020137029478A priority Critical patent/KR101507676B1/ko
Priority to BR112013028267-3A priority patent/BR112013028267B1/pt
Priority to JP2014508677A priority patent/JP5684947B2/ja
Publication of WO2012149847A1 publication Critical patent/WO2012149847A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • 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
    • H04B7/2603—Arrangements for wireless physical layer control

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting a wireless frame. Background technique
  • WLAN Wireless Local Area Networks
  • the essence of WLAN is to replace the connection mode of wired cable by means of wireless connection, realize the wireless interconnection of computer and network, so that the construction of the network and the movement of the terminal are more flexible.
  • IEEE Institute for Electrical and Electronic Engineers 802.11 is one of the mainstream technologies for wireless LANs. This protocol mainly specifies the physical layer (PHY) and media access control layer (MAC) specifications.
  • PHY physical layer
  • MAC media access control layer
  • 802.11ac the development history of 802.11ac.
  • the actual physical technology has also evolved from direct sequence spread spectrum technology to Orthogonal Frequency Division Multiplexing (OFDM) technology, and introduced multi-antenna technology in IEEE802.11n, introducing large bandwidth in IEEE802.il ac. And multi-user Multiple Input Multiple Output (MU-MIMO).
  • OFDM Orthogonal Frequency Division Multiplexing
  • MU-MIMO multi-user Multiple Input Multiple Output
  • the current IEEE 802.il ac system stipulates that when the receiving end needs to feed back channel information to the transmitting end, the transmitting end sends a feedback request frame (NDPA, Null Data Packet Announcement) and a channel measurement frame (NDP, Null Data Packet) to the receiving end.
  • NDPA feedback request frame
  • NDP channel measurement frame
  • STA (equivalent to the receiving end) corresponding to the address (STA) information field in the NDPA feeds back channel information.
  • the NDP format of the channel measurement frame is as shown in FIG. 1, and includes: a long training sequence (L-STF), Short training sequence (S-STF), signal domain (L-SIG), VHT signal A domain (VHT-SIG-A), VHT short training sequence (VHT-STF), VHT long training domain (VHT-LTF) and VHT Signal B domain (VHT-SIG-B).
  • L-STF long training sequence
  • S-STF Short training sequence
  • L-SIG signal domain
  • VHT-SIG-A VHT signal A domain
  • VHT-STF VHT short training sequence
  • VHT-LTF VHT long training domain
  • VHT-SIG-B VHT Signal B domain
  • the main technical problem to be solved by the present invention is to provide a method and apparatus for transmitting a radio frame, which can determine the maximum number of VHT-LTFs in the VHT long training domain in the channel measurement frame NDP.
  • the present invention provides a method for transmitting a radio frame, the method comprising: transmitting a channel measurement frame NDP to a receiving end; the channel measurement frame NDP includes at least two VHT long training domains VHT-LTF, The maximum number of VHT-LTFs in the VHT long training domain is determined according to the number of VHT long training domains VHT-LTF that at least one receiver can support.
  • the maximum number of VHT-LTFs in the VHT-long training domain is determined according to the number of VHT-long training domains VHT-LTF that can be supported by at least one receiving end, and is: when there is only one receiving end, the maximum number The number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the channel of the receiving end measures the maximum supportable dimension or the smaller of the two.
  • the maximum number of VHT-LTFs in the VHT-long training domain is determined according to the number of VHT-long training domains VHT-LTF that can be supported by at least one receiving end, and is: when there are multiple receiving ends, the maximum number The number is the minimum of the number of VHT long training domains VHT-LTF that each receiving end can support.
  • the method further includes: for each receiving end, the number of VHT long training domains VHT-LTF that can be supported is the number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the channel measurement of the receiving end is maximum The supported dimensions or the smaller of the two.
  • the method further includes: setting the number of VHT long training domains VHT-LTF included in the channel measurement frame NDP to be the same as the Nsts indicated in the VHT signal A domain VHT-SIG-A.
  • the channel measurement frame NDP is composed of a long training sequence L-STF, a short training sequence S-STF, a signal domain L-SIG, a VHT signal A domain VHT-SIG-A, a VHT short training sequence VHT-STF, at least two A VHT long training domain consists of VHT-LTF.
  • a transmitting device for a radio frame configured to send a channel measurement frame NDP to a receiving end;
  • the channel measurement frame NDP includes at least two VHT long training domains VHT-LTF, the VHT long training domain VHT-
  • the maximum number of LTFs is determined according to the number of VHT long training domains VHT-LTF that at least one receiver can support.
  • the maximum number is the number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the maximum supported dimension of the channel measurement of the receiving end or the smaller of the two.
  • the maximum number is the minimum of the number of VHT long training domains VHT-LTF that each receiving end can support; for each receiving end, the VHT that it can support
  • the number of long training domain VHT-LTF is the number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the maximum supported dimension of the channel measurement of the receiving end or the smaller of the two.
  • the channel measurement frame NDP is composed of a long training sequence L-STF, a short training sequence S-STF, a signal domain L-SIG, a VHT signal A domain VHT-SIG-A, a VHT short training sequence VHT-STF, at least two A VHT long training domain consists of VHT-LTF.
  • the beneficial effects of the present invention are: In the method and apparatus for transmitting a radio frame according to the present invention, the maximum number of VHT-LTFs in the transmitted channel measurement frame is determined by the number of VHT long training domains VHT-LTF that the receiving end can support. Therefore, the number of VHT-LTFs in the channel measurement frame is more reasonable, and the characteristics of the receiving end are more reflected.
  • the channel measurement frame NDP is composed of a long training sequence (L-STF), a short training sequence (S-STF), a signal domain (L-SIG), and a VHT signal A domain (VHT- SIG-A), VHT short training sequence (VHT-STF), at least two VHT long training domains (VHT-LTF) composition.
  • L-STF long training sequence
  • S-STF short training sequence
  • L-SIG signal domain
  • VHT- SIG-A VHT signal A domain
  • VHT-STF VHT short training sequence
  • VHT-LTF VHT long training domains
  • the channel measurement frame in the method and apparatus of the present invention lacks the VHT signal B field (VHT-SIG-B), thereby reducing the transmission channel measurement frame when transmitting the channel measurement frame NDP to the receiving end.
  • VHT-SIG-B VHT signal B field
  • FIG. 2 is a diagram showing the structure of a channel measurement frame NDP in an embodiment of the present invention. detailed description
  • the channel measurement frame NDP in the protocol consists of L-STF, S-STF (short training sequence), L-SIG (signal domain), VHT-SIG-A (VHT signal A domain), VHT-STF. (VHT short training sequence;), VHT-LTF (VHT long training domain) and VHT-SIG-B (VHT signal B domain).
  • the present invention provides a method and apparatus for transmitting a radio frame, which is used to send a channel measurement frame NDP to a receiving end.
  • a new channel measurement frame NDP frame structure is employed.
  • the channel measurement frame NDP consists of a long training sequence (L-STF), a short training sequence (S-STF), a signal domain (L-SIG), a VHT signal A domain (VHT-SIG-A), and a VHT short training sequence (VHT).
  • -STF consisting of at least two VHT long training domains (VHT-LTF).
  • VHT-SIG-B VHT signal B field
  • the existing VHT-SIG-B VHT signal B domain
  • the data length Length is defined by the NDP transmission parameter vector table in the protocol, and the data length is limited to 0 in the NDP transmission parameter vector table.
  • MCS data modulation coding order
  • the present invention is designed to be indicated in the VHT signal A field.
  • the table below shows the VHT-SIG-A indication
  • VHT-SIG-B VHT signal B field
  • TXVECTOR and VHT signal A fields the original function of the VHT-SIG-B (VHT signal B domain) can be guaranteed, and the pilot overhead required for transmitting the NDP can be reduced, thereby performing channel measurement using the NDP of the present invention. Can increase the data transfer rate.
  • VHT-LTF VHT long training domain
  • VHT-LTF The maximum number of VHT long training domains included in the channel measurement frame NDP is determined according to the number of VHT long training domains (VHT-LTF) that at least one receiver can support.
  • the maximum value is the number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the maximum supported dimension of the channel measurement of the receiving end or the smaller of the two. For example, if the receiving end has only the station STA1, the number of transmitting antennas of the feedback matrix indicated by the capability field of the station STA1 is 4, and the maximum supported dimension of the channel measurement of the station is 8, and the maximum number of VHT-LTFs is set. A small value between 4 or 8 or two.
  • the threshold is the minimum of the number of VHT-LTFs that each receiver can support.
  • the number of VHT-long training domains VHT-LTF that can be supported is the number of transmitting antennas of the feedback matrix indicated by the capability domain of the receiving end or the maximum supported dimension of the channel measurement of the receiving end or two of Smaller value.
  • the receiving end is two stations, which are STA1 and STA2 respectively.
  • the number of VHT-LTFs that N1 can support simultaneously measuring is 4, and the number of VHT-LTFs that STA2 can support for measuring NDP is 8, then NDP
  • the threshold of the VHT-LTF is 4.
  • the maximum value of the number of VHT-LTFs in the NDP due to the transmitted channel measurement frame is the minimum value among the number of VHT-LTFs that can be supported by each receiving end. That is, there is no case where the number of VHT-LTFs transmitted exceeds the number of VHT-LTFs that can be supported by a certain receiving end. If the maximum number is not set, it may happen that the number of VHT-LTFs sent is eight, and the number of VHT-LTFs that can be supported by one receiver is only four, which causes waste of transmission. , increased the overhead of the pilot. On the other hand, an additional algorithm is needed to process the extra four VHT-LTFs, thereby increasing the complexity of the transmission method and apparatus.
  • VHT-LTF VHT long training domain
  • VHT-SIG VHT signal A domain

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Communication Control (AREA)

Description

一种无线帧的发送方法和装置 技术领域
本发明涉及无线通信技术领域， 尤其是一种无线帧的发送方法和装置。 背景技术
无线局或网络 ( WLAN, Wireless Local Area Networks )是应用无线通 信技术将计算机设备互联起来， 构成可以互相通信和实现资源共享的网络 体系。 无线局域网的本质是通过无线连接的方式代替有线电缆的连接方式， 实现计算机与网络的无线互连， 从而使网络的构建和终端的移动更加灵活。
电气和电子工程师十办会（IEEE, Institute for Electrical and Electronic Engineers ) 802.11 是目前无线局域网的主流技术之一， 此协议主要规定了 物理层（PHY )和媒体访问控制层（MAC )规范。 随着移动通信技术的发 展以及人们对无线网络的需求的提高， 物理层技术规范向着速度越来越高 的方向不断发展， 经历了 801.11到 802.11b,再到 802.11a/g, 然后 802.11η, 最后到 802.11ac的发展历程。 实际的物理技术也从直接序列扩频技术发展 到正交频分复用 ( OFDM, Orthogonal Frequency Division Multiplexing )技 术， 并且在 IEEE802.11n中引入了多天线技术， 在 IEEE802.il ac中引入大 带宽和多用户多输入多输出（ MU-MIMO, Multi-User Multiple Input Multiple Output )。
当前 IEEE802.il ac系统规定，当需要接收端向发送端反馈信道信息时， 发送端向接收端发送反馈请求帧 （ NDPA, Null Data Packet Announcement ) 和信道测量帧 （NDP, Null Data Packet ), 要求 NDPA中的站点 （ STA )信 息域对应地址的 STA (相当于接收端）反馈信道信息。
其中，信道测量帧 NDP格式如图 1所示， 包括： 长训练序列（L-STF )、 短训练序列 （S-STF )、 信号域（L-SIG )、 VHT信号 A域（ VHT-SIG-A )、 VHT短训练序列 （ VHT-STF ), VHT长训练域（ VHT-LTF )和 VHT信号 B 域（ VHT-SIG-B )。
现有技术中缺少一种对于信道测量帧 NDP中的 VHT-LTF的个数的最 大值的确定方法和装置。 发明内容
本发明要解决的主要技术问题是， 提供一种无线帧的发送方法和装置， 能够确定信道测量帧 NDP中 VHT长训练域 VHT-LTF的最大个数。
为解决上述技术问题， 本发明提供一种无线帧的发送方法， 该方法包 括： 向接收端发送信道测量帧 NDP; 所述信道测量帧 NDP 包括至少两个 VHT长训练域 VHT-LTF, 所述 VHT长训练域 VHT-LTF的最大个数根据至 少一个接收端能支持的 VHT长训练域 VHT-LTF的个数确定。
进一步地， 所述 VHT长训练域 VHT-LTF的最大个数根据至少一个接 收端能支持的 VHT长训练域 VHT-LTF的个数确定， 为： 当只有一个接收 端时， 所述最大个数为所述接收端的能力域指示的反馈矩阵的发送天线数 或者接收端的信道测量最大可支持的维数或者两个当中的较小值。
进一步地， 所述 VHT长训练域 VHT-LTF的最大个数根据至少一个接 收端能支持的 VHT长训练域 VHT-LTF的个数确定， 为： 当有多个接收端 时， 所述最大个数为各个接收端能支持的 VHT长训练域 VHT-LTF的个数 中的最小值。
进一步地， 该方法还包括： 对于每个接收端， 其能支持的 VHT长训练 域 VHT-LTF的个数为所述接收端的能力域指示的反馈矩阵的发送天线数或 者接收端的信道测量最大可支持的维数或者两个当中的较小值。
进一步地， 该方法还包括： 设置信道测量帧 NDP中包含的 VHT长训 练域 VHT-LTF的个数与 VHT信号 A域 VHT-SIG-A中指示的 Nsts相同。 进一步地， 所述信道测量帧 NDP 由长训练序列 L-STF、 短训练序列 S-STF、 信号域 L-SIG、 VHT信号 A域 VHT-SIG-A、 VHT短训练序列 VHT-STF、 至少二个 VHT长训练域 VHT-LTF组成。
一种无线帧的发送装置， 所述发送装置， 用于向接收端发送信道测量 帧 NDP; 所述信道测量帧 NDP包括至少两个 VHT长训练域 VHT-LTF, 所 述 VHT长训练域 VHT-LTF的最大个数根据至少一个接收端能支持的 VHT 长训练域 VHT-LTF个数确定。
进一步地， 当只有一个接收端时， 所述最大个数为该接收端的能力域 指示的反馈矩阵的发送天线数或者接收端的信道测量最大可支持的维数或 者两个当中的较小值。
进一步地， 当有多个接收端时， 所述最大个数为每个接收端能支持的 VHT长训练域 VHT-LTF的个数中的最小值； 对于每个接收端， 其能支持的 VHT长训练域 VHT-LTF个数为所述接收端的能力域指示的反馈矩阵的发 送天线数或者接收端的信道测量最大可支持的维数或者两个当中的较小 值。
进一步地， 所述信道测量帧 NDP 由长训练序列 L-STF、 短训练序列 S-STF、 信号域 L-SIG、 VHT信号 A域 VHT-SIG-A、 VHT短训练序列 VHT-STF、 至少二个 VHT长训练域 VHT-LTF组成。
本发明的有益效果是： 本发明通过的无线帧的发送方法和装置中， 通 过接收端能支持的 VHT长训练域 VHT-LTF的个数确定发送的信道测量帧 中的 VHT-LTF的最大个数， 从而使信道测量帧中的 VHT-LTF的个数更加 合理， 更能反映接收端的特性。
本发明的无线帧的发送方法和装置中， 信道测量帧 NDP由长训练序列 ( L-STF )、 短训练序列 （S-STF )、 信号域 （L-SIG )、 VHT 信号 A 域 ( VHT-SIG-A )、 VHT短训练序列 （ VHT-STF )、 至少二个 VHT长训练域 ( VHT-LTF )组成。 相比于现有技术， 本发明的方法和装置中的信道测量 帧少了 VHT信号 B域（ VHT-SIG-B ),从而在向接收端发送信道测量帧 NDP 时， 降低了发送信道测量帧 NDP的导频开销。 附图说明
图 1为现有中的信道测量帧 NDP的结构；
图 2为本发明一种实施方式中的信道测量帧 NDP的结构。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
如图 1所示， 协议中的信道测量帧 NDP由 L-STF、 S-STF (短训练序 列）、 L-SIG (信号域）、 VHT-SIG-A ( VHT信号 A域）、 VHT-STF ( VHT 短训练序列；)、 VHT-LTF ( VHT长训练域 )和 VHT-SIG-B ( VHT信号 B域 ) 组成。
为节省导频开销， 如图 2所示， 本发明提供了一种无线帧的发送方法 和装置， 用于向接收端发送信道测量帧 NDP。 在本发明的发送方法和装置 中， 采用了一种新的信道测量帧 NDP帧结构。 该信道测量帧 NDP由长训 练序列 （L-STF )、 短训练序列 （S-STF )、 信号域（L-SIG )、 VHT信号 A域 (VHT-SIG-A)、 VHT短训练序列 （ VHT-STF )、 至少两个 VHT 长训练域 ( VHT-LTF )组成。
可以看到， 本发明的帧结构与现有技术相比， 一个主要的区别在于： 省略了 VHT-SIG-B ( VHT信号 B域）。现有的 VHT-SIG-B ( VHT信号 B域） 包括以下四部分内容， 分别是： 数据长度（ Length ), 数据的调制编码阶数 ( MCS ), 保留比特（Reserved ) 以及尾比特（ Tail )。 对于数据长度 Length 由协议中的 NDP发送参数矢量表限定， 在 NDP发送参数矢量表中将数据 长度限定为 0。 而对于数据的调制编码阶数 MCS, 保留比特 Reserved和尾比特 Tail, 本发明将其设计为在 VHT信号 A域中指示。 下表为 VHT-SIG-A指示的内
Figure imgf000007_0001
由此可见， VHT-SIG-B ( VHT信号 B域） 的内容已在发送参数矢量表 TXVECTOR和 VHT信号 A域中指示。 从而在本发明中， 即能保证实现 VHT-SIG-B ( VHT信号 B域）的原有功能， 又能够降低发送 NDP所需的导 频开销， 从而在利用本发明的 NDP进行信道测量时， 可以提高数据的传输 速率。
不论是现有中的信道测量帧 NDP的结构， 还是本发明中提出的信道测 量帧 NDP的结构， 均具有 VHT长训练域（VHT-LTF )。 本发明的发送方法 和装置在发送信道测量帧 NDP前， 还对 VHT长训练域的最大个数进行设 定：
根据至少一个接收端能支持的 VHT长训练域（ VHT-LTF )个数确定信 道测量帧 NDP包含的 VHT长训练域（VHT-LTF )个数的最大值。
其中， 当只有一个接收端时， 最大值为该接收端的能力域指示的反馈 矩阵的发送天线数或者接收端的信道测量最大可支持的维数或者两个当中 的较小值。 比如， 接收端只有站点 STA1 , 站点 STA1的能力域指示的反馈矩阵的 发送天线数为 4, 该站点的信道测量最大可支持的维数为 8, 则 VHT-LTF 的个数的最大值设置有 4或者 8或者两个之间的小值。
当有两个或者两个以上的接收端时， 门限值为各个接收端能支持的 VHT-LTF的个数中的最小值。对于每一接收端， 其能支持的 VHT长训练域 VHT-LTF个数为所述接收端的能力域指示的反馈矩阵的发送天线数或者接 收端的信道测量最大可支持的维数或者两个当中的较小值。
比如， 接收端为两个站点， 分别是 STA1和 STA2, STA1能支持同时 测量的 NDP的 VHT-LTF的个数为 4, STA2能支持测量的 NDP的 VHT-LTF 个数为 8, 则 NDP的 VHT-LTF的门限值为 4。
当接收端有多个时， 由于发送的信道测量帧 NDP中的 VHT-LTF个数 的最大值为各个接收端能够支持的 VHT-LTF的个数当中的最小值。 即不存 在发送的 VHT-LTF个数超过某个接收端能够支持的 VHT-LTF的个数的情 况。 如果不设置最大个数， 可能出现的情况是发送的 VHT-LTF的个数为 8 个， 而某个接收端能支持的 VHT-LTF的个数只有 4个， 一方面这造成了发 送的浪费， 增加了导频的开销。 另一方面， 需要额外的算法对多余的 4个 VHT-LTF进行处理， 从而增加了发送方法和装置的复杂度。
对上述门限值进行设定后， 在不超过所述门限值的情况下， 设置信道 测量帧 NDP中包含的 VHT长训练域 ( VHT-LTF )个数与 VHT信号 A域 ( VHT-SIG-A ) 中指示的 Nsts相同。 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1、 一种无线帧的发送方法， 其特征在于， 该方法包括： 向接收端发送 信道测量帧 NDP; 所述信道测量帧 NDP 包括至少两个 VHT 长训练域 VHT-LTF, 所述 VHT长训练域 VHT-LTF的最大个数根据至少一个接收端 能支持的 VHT长训练域 VHT-LTF的个数确定。
2、 如权利要求 1所述的发送方法， 其特征在于， 所述 VHT长训练域 VHT-LTF 的最大个数根据至少一个接收端能支持的 VHT 长训练域 VHT-LTF的个数确定， 为： 当只有一个接收端时， 所述最大个数为所述接 收端的能力域指示的反馈矩阵的发送天线数或者接收端的信道测量最大可 支持的维数或者两个当中的较小值。
3、 如权利要求 1所述的发送方法， 其特征在于， 所述 VHT长训练域 VHT-LTF 的最大个数根据至少一个接收端能支持的 VHT 长训练域 VHT-LTF的个数确定， 为： 当有多个接收端时， 所述最大个数为各个接收 端能支持的 VHT长训练域 VHT-LTF的个数中的最小值。
4、 如权利要求 3所述的发送方法， 其特征在于， 该方法还包括： 对于 每个接收端， 其能支持的 VHT长训练域 VHT-LTF的个数为所述接收端的 能力域指示的反馈矩阵的发送天线数或者接收端的信道测量最大可支持的 维数或者两个当中的较小值。
5、 如权利要求 1至 4中任一项所述的发送方法， 其特征在于， 该方法 还包括： 设置信道测量帧 NDP中包含的 VHT长训练域 VHT-LTF的个数与 VHT信号 A域 VHT-SIG-A中指示的 Nsts相同。
6、 如权利要求 1至 4中任一项所述的发送方法， 其特征在于， 所述信 道测量帧 NDP由长训练序列 L-STF、 短训练序列 S-STF、 信号域 L-SIG、 VHT信号 A域 VHT-SIG-A、 VHT短训练序列 VHT-STF、 至少二个 VHT 长训练域 VHT-LTF组成。
7、 一种无线帧的发送装置， 其特征在于， 所述发送装置， 用于向接收 端发送信道测量帧 NDP; 所述信道测量帧 NDP包括至少两个 VHT长训练 域 VHT-LTF, 所述 VHT长训练域 VHT-LTF的最大个数根据至少一个接收 端能支持的 VHT长训练域 VHT-LTF个数确定。
8、如权利要求 7所述的发送装置， 其特征在于， 当只有一个接收端时， 所述最大个数为所述接收端的能力域指示的反馈矩阵的发送天线数或者接 收端的信道测量最大可支持的维数或者两个当中的较小值。
9、 如权利要求 7所述的发送装置， 其特征在于， 当有多个接收端时， 所述最大个数为每个接收端能支持的 VHT长训练域 VHT-LTF的个数中的 最小值； 对于每个接收端， 其能支持的 VHT长训练域 VHT-LTF个数为所 述接收端的能力域指示的反馈矩阵的发送天线数或者接收端的信道测量最 大可支持的维数或者两个当中的较'』、值。
10、 如权利要求 7至 9中任一项所述的发送装置， 其特征在于， 所述 信道测量帧 NDP由长训练序列 L-STF、 短训练序列 S-STF、 信号域 L-SIG、 VHT信号 A域 VHT-SIG-A, VHT短训练序列 VHT-STF, 至少二个 VHT 长训练域 VHT-LTF组成。
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