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Feedback method and system of channel measurement information

A channel measurement and information feedback technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve problems such as TXOP acquisition failure, reduce network throughput, and waste of bandwidth resources, so as to avoid backoff and retransmission, and save bandwidth resource effect

Active Publication Date: 2012-11-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when multiple segments are sent in one A-MPDU, if the beamformer only receives part of the segments correctly, and the beamformer does not do any processing at this time, it just thinks that the transmission failed, which will cause unnecessary backoff and retry Especially when NDPA is the first frame of TXOP, if the transmission is considered to be failed, it will lead to the failure of TXOP acquisition, and the beamformer needs to back off and compete for the channel again, which reduces the throughput of the network

Method used

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  • Feedback method and system of channel measurement information
  • Feedback method and system of channel measurement information
  • Feedback method and system of channel measurement information

Examples

Experimental program
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no. 1 example

[0049] In the first embodiment, the AP sends NDPA frames to stations STA1, STA2, and STA3, requesting them to perform channel measurement and feedback the measurement results. The AP uses the NDPA frame to initiate a transmission opportunity, and the NDPA frame carries identification information of STA1, STA2, and STA3.

[0050] After the NDPA transmission ends, the AP waits for the SIFS to send the NDP frame. After STA1, STA2 and STA3 receive NDPA frames and NDP frames, it is assumed that STA1, the first station in NDPA, waits for SIFS after receiving NDP frames, and feeds back its own channel measurement information VHT Compressed Beamforming frame to AP.

[0051] Assuming that the VHT Compressed Beamforming frame of STA1 exceeds the maximum MPDU length, the VHT Compressed Beamforming frame needs to be segmented. In this embodiment, as Figure 4 As shown, STA1 divides the feedback frame into 8 segments and sends it to the AP in an A-MPDU. Each segment indicates the number of...

no. 2 example

[0054] In the second embodiment, after obtaining the TXOP, the AP sends NDPA frames to the stations STA1, STA2 and STA3, requesting them to perform channel measurement and feedback the measurement results. The NDPA frames carry identification information of STA1, STA2 and STA3.

[0055] After the NDPA transmission ends, the AP waits for the SIFS to send the NDP frame. After STA1, STA2 and STA3 receive NDPA frames and NDP frames, it is assumed that STA1, the first station in NDPA, waits for SIFS after receiving NDP frames, and feeds back its own channel measurement information VHT Compressed Beamforming frame to AP.

[0056] Assuming that the VHT Compressed Beamforming frame of STA1 exceeds the maximum MPDU length, the VHT Compressed Beamforming frame needs to be segmented. In this embodiment, as Figure 4 As shown, STA1 divides the feedback frame into 8 segments, and sends it to the AP in an A-MPDU. Each segment indicates the number of remaining segments and whether it is the ...

no. 3 example

[0059] In the third embodiment, after obtaining the TXOP, the AP sends an NDPA frame to the stations STA1, STA2, and STA3, requesting them to perform channel measurement and feedback the measurement results. The NDPA frame carries identification information of STA1, STA2, and STA3.

[0060] After the NDPA transmission ends, the AP waits for the SIFS to send the NDP frame. After STA1, STA2 and STA3 receive the NDPA frame and NDP frame, the first station in NDPA, STA1, waits for SIFS after receiving the NDP frame, and feeds back its own channel measurement information VHT Compressed Beamforming frame to the AP. After receiving the sounding poll sent by the AP, feed back its own channel measurement information VHT Compressed Beamforming frame to the AP.

[0061] Assuming that the VHT Compressed Beamforming frame of STA2 exceeds the maximum MPDU length, the VHT Compressed Beamforming frame needs to be segmented. In this embodiment, as Figure 4 As shown, STA2 divides the feedback...

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Abstract

The invention discloses a feedback method and a feedback system of channel measurement information. The feedback method comprises the steps that a receiving station receives a control frame for channel measurement from the sending station and sends the channel measurement information to the sending station; the sending station correctly receives the channel measurement information or part of the channel measurement information so as to acquire the effective response frame of the control frame for channel measurement. If the sending station only correctly receives part of the channel measurement information, the sending station does not determine the failure of the transmission, but determines that the effective response frame of the control frame for channel measurement is acquired, so that the unnecessary retreat and retransmission are avoided, and the sources of bandwidth are saved.

Description

technical field [0001] The invention relates to wireless local area network technology, in particular to a channel measurement information feedback method and system. Background technique [0002] At present, in the wireless network field, with the rapid development of wireless local area network (WLAN), the demand for WLAN coverage is increasing day by day, and the requirement for throughput is also getting higher and higher. The Institute of Electrical and Electronics Engineers industry specification IEEE802.11 group has defined 802.11a, 802.11b, 802.11g and a series of the most common WLAN technology standards; subsequently, other task groups have emerged one after another, dedicated to the development of the current WLAN technology. There are specifications for 802.11 technical improvements. For example, the 802.11n task group proposed a high throughput (HT, High throughput) requirement, supporting a data rate of up to 600 Mbps, and the 802.11ac task group further propos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04W24/00H04W84/12
CPCH04W24/10H04B7/0617H04W28/06H04L1/1685H04L1/1809H04B7/0632H04W72/0446
Inventor 李楠吕开颖孙波姜静张力
Owner ZTE CORP
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