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Method and system for transmitting channel feedback information

A technology of channel feedback and feedback information, applied in wireless communication, error prevention/detection using return channel, electrical components, etc., can solve problems such as interference, achieve the effect of solving bandwidth selection problems and avoiding interference problems

Inactive Publication Date: 2012-11-28
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, 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 when the receiver feeds back channel information, And because the receiver does not perform free channel assessment CCA detection, in the case of overlapping basic service sets, there is a problem of interference

Method used

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  • Method and system for transmitting channel feedback information
  • Method and system for transmitting channel feedback information

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Embodiment 1

[0037] In this embodiment, one or more stations access the network through an access point AP, and based on the transmission method of channel feedback information provided by the present invention, the steps of this embodiment are as follows;

[0038] Step 101, the access point AP sends a VHT or HT format NDPA frame, and the NDPA frame is the first frame, after sending the NDPA frame and after a short interframe space (Short InterFrame Space, SIFS), sends an NDP frame to its control and management the site;

[0039] Step 102, the first station indicated in the first NDPA frame selects an idle channel to reply to the channel listening feedback (Sounding Feedback) after receiving the NDPA frame and the NDP frame, after an interval of SIFS;

[0040] Because the format of the NDPA frame is VHT or HT format, therefore, the first station can directly select an idle channel to respond to the channel monitoring feedback according to the existing protocol, and does not need to perform...

Embodiment 2

[0047] In this embodiment, one or more stations access the network through an access point AP, and based on the transmission method of channel feedback information provided by the present invention, the steps of this embodiment are as follows;

[0048] Step 201, the access point AP sends the NDPA in non-HT duplicate format as the first frame, and sends the NDP frame after the SIFS interval after the NDPA is sent;

[0049] Step 202, the first station indicated in the NDPA frame performs the free channel assessment CCA detection in the PIFS before the access point AP sends the NDPA, and judges whether the channel is busy or not;

[0050] Step 203, the first station receives the NDPA frame sent by the access point AP, and after receiving the NDPA frame and NDP frame and waiting for the SIFS, selects an idle channel according to the idle channel evaluation detection result to reply the channel monitoring and feedback the Sounding Feedback.

[0051] Step 204, after receiving the ch...

Embodiment 3

[0057] In this embodiment, multiple stations access the network through an access point AP, and based on the transmission method of channel feedback information provided by the present invention, the steps of this embodiment are as follows;

[0058] Step 301, within a transmission opportunity (Transmission Opportunity, TXOP), the access point AP waits for a PIFS and then sends the NDPA frame in the non-HT duplicate format, and sends the NDP frame after the NDPA sending end interval SIFS;

[0059] In this embodiment, the NDPA frame in non-HT duplicate format sent by the access point AP is a non-first frame;

[0060] Step 302, the first station indicated in the NDPA frame performs the free channel assessment CCA detection in the PIFS before the access point AP sends the NDPA, and judges whether the channel is busy or not;

[0061] Step 303, the first station receives the NDPA frame sent by the access point AP, and after receiving the NDPA frame and the NDP frame and waiting for ...

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Abstract

The invention discloses a method and a system for transmitting channel feedback information, and is applied to a very high throughput (VHT) wireless local area network system. The method and the system are used for solving the problem of bandwidth selection during the channel information feedback of a receiving party and the problem of interference caused by no clear channel assessment (CCA) detection of the receiving party under the condition of an overlapping basic service set. Before a transmitting party transmits a wireless frame for requesting for the channel feedback information, at least a specified inter-frame space is required to be reserved for the CCA detection of the receiving party within the specified inter-frame space, and the receiving party performs the CCA detection before the channel feedback information is transmitted, so that a clear bandwidth in line with a protocol requirement can be selected to transmit the channel feedback information. Therefore, the problem of the interference caused by the overlapping basic service set and the problem of channel feedback bandwidth selection can be solved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a transmission method and system for channel feedback information. Background technique [0002] At present, in the field of wireless networks, wireless local area network (Wireless Local Access Network, WLAN) develops rapidly, the requirement for WLAN coverage is increasing day by day, and the requirement for throughput is also getting higher and higher. In the IEEE802.11 group of the Institute of Electrical and Electronics Engineers industry specification, a series of standards such as 802.11a, 802.11b, 802.11g, etc. have been defined successively. Specifications for technical improvement, for example, the 802.11n task group puts forward the requirement of high throughput (High throughput, HT), supporting data rates up to 600Mbps, and the 802.11ac task group further proposes the concept of very high throughput (VHT) , by introducing a larger channel bandwidth to increase the ...

Claims

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Application Information

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IPC IPC(8): H04L1/16
CPCH04W72/085H04W72/542
Inventor 江岸明邢卫民孙波姜静
Owner ZTE CORP
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