Method and device for channel information collection

A channel information and information collection technology, which is applied in the field of channel information collection methods and devices, can solve the problems such as the inability of channel information collectors to effectively obtain transmission opportunities, the inability of channel information collectors to obtain transmission opportunities, and the length of channel information feedback frames. Achieve the effect of improving the success rate, ensuring channel resources, and ensuring rational utilization

Inactive Publication Date: 2012-10-17
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the channel information feedback frame is longer than NDPA, and the transmission reliability is low. Therefore, the transmission of the first channel information feedback frame is more likely to fail, resulting in the channel information collector not being able to obtain a transmission opportunity, and then chooses to back off randomly and re-compete channel
[0007] Aiming at the problem in the related art that the channel information collector uses NDPA+NDP+the success of the first channel information feedback frame frame exchange sequence as the basis for obtaining the transmission opportunity, which leads to the problem that the channel information collector cannot effectively obtain the transmission opportunity, no effective solution has been proposed so far. solution

Method used

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  • Method and device for channel information collection
  • Method and device for channel information collection
  • Method and device for channel information collection

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Embodiment 1

[0048] This embodiment is a preferred embodiment of a method for collecting channel information using the embodiment of the present invention. In this embodiment, the channel information collection process mainly includes the following steps:

[0049] Assume that after the channel information collector accesses the access channel, it sends the NDPA carrying three STAs as the first frame of the transmission, and when the transmission is completed, it will obtain this transmission opportunity. After the NDP transmission is completed, it is determined that the transmission fails, and the channel information collector does not detect the signal within the preset time interval. If the specific time delay (such as PIFS) does not exceed the duration of the transmission opportunity, and within the PIFS time, the access channel has been in In the idle state, the channel information sender continues to send the polling frame carrying the next station that needs to feed back channel info...

Embodiment 2

[0051] In this embodiment, it is assumed that the channel information collector sends an NDPA carrying three STAs as the first frame after the channel information collector grants channel access, and obtains the current transmission opportunity after the sending is completed. After the NDP transmission is completed, the channel information collector does not detect the signal within the preset time interval, and determines that the transmission has failed. If the specific time delay (such as PIFS) does not exceed the duration of the transmission opportunity, and within the specific time delay, the channel If it is always in the idle state, the channel information collector will re-send the polling frame to the current feedback failure station, or re-compete for the channel. Retransmissions are no different than initial transmissions when polling other stations. If two consecutive transmissions fail (here the transmission error threshold is assumed to be 2), such as continuous ...

Embodiment 3

[0053] Assume that after the channel information collector allows the channel access, it sends the NDPA carrying one STA as the first frame of the transmission. After the transmission is completed, the transmission opportunity of this time is obtained. After the NDP transmission is completed, the channel information collector receives an error frame and determines that the transmission has failed. If the specific time delay (such as PIFS) does not exceed the duration of the transmission opportunity, and the access channel has been in an idle state during the specific time delay, Then the channel information collector resends NDPA+NDP, otherwise re-competes for the channel. If two consecutive transmissions fail (here, the threshold of transmission errors is assumed to be 2), the channel will be contended for again.

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Abstract

The invention discloses a method and a device for channel information collection. The method comprises the following steps: a channel information collector contends to access a channel; the channel information collector sends one or more wireless frames of relevant information bearing channel information collection; the channel information collector acquires a transmission opportunity after the first wireless frame of the one or more wireless frames is transmitted; and the channel information collector collects channel information fed back from a channel information feedback party in the transmission opportunity duration. With the method and the device of the invention, fairness among various stations and rational utilization of channel resources can be ensured.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a method and device for collecting channel information in wireless local area network communication. Background technique [0002] At present, the Institute of Electrical and Electronics Engineers industry standard IEEE802.11 group has defined a series of the most common standard WLAN technologies such as 802.11a, 802.11b, 802.11g, etc., and then other task groups have emerged one after another, dedicated to the development of related The existing 802.11 technical improvement specifications, for example, the 802.11n task group puts forward the requirement of high throughput (High throughput, referred to as HT), which supports a data rate up to 600Mbps, and the 802.11ac task group further proposes the concept of VHT (Very High throughput), The data rate is increased to 1Gbps by introducing a larger channel bandwidth. [0003] In 802.11, an access point (AP for short) and mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04W74/00H04W84/12
Inventor 韩志强姜静李楠田开波
Owner ZTE CORP
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