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Group transmissions in wireless local area networks

A technology of wireless medium and group information, which is applied in the field of group transmission in wireless local area network, and can solve the problem that the protection mechanism cannot work properly

Inactive Publication Date: 2012-12-26
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Since more than two devices are involved in a group transmission or group frame exchange, the existing protection mechanisms for RTS and CTS frame exchanges (which are designed for only two devices) cannot work properly
Similarly, frame response mechanisms such as acknowledgment (ACK) frames and block ACK frames do not work properly for group transfers or group framing exchanges (which are designed for use with only two devices)

Method used

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  • Group transmissions in wireless local area networks
  • Group transmissions in wireless local area networks
  • Group transmissions in wireless local area networks

Examples

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Embodiment

[0157] CLAIMS 1. A method for channel sounding by an access point, the method comprising transmitting a sounding frame to a plurality of mobile stations (STAs), wherein the sounding frame includes training symbol. receiving a probe response frame from each of the plurality of STAs, wherein the probe response frame received from the first STA of the plurality of STAs is delayed by a short interframe space interval after completion of the transmission of the probe frame take over.

[0158] 2. The method according to embodiment 1, wherein the sounding frame further includes one or more of the following: an indication that the frame is a sounding frame, a request for a sounding response frame from the STA, an indication of the feedback from the STA A request, group information for identifying a group of STAs to provide a probe response, scheduling information for a probe response frame, a request for additional channel measurements to be included in a probe response frame, or a t...

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Abstract

A method for channel sounding by an access point includes transmitting a sounding frame to a plurality of mobile stations (STAs). The sounding frame includes training symbols to be measured by each of the plurality of STAs. A sounding response frame is received from each of the plurality of STAs. The sounding response frame received from a first STA of the plurality of STAs is received at a short interframe spacing interval delay after completion of the sounding request frame transmission.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Applications 61 / 323,617, filed April 13, 2010, 61 / 332,404, filed May 7, 2010, and 61 / 334,346, filed May 13, 2010, and the contents of these applications Incorporated here for reference. Background technique [0003] A wireless local area network (WLAN) in infrastructure basic service set (BSS) mode has an access point (AP) for the BSS and one or more stations (STA) associated with the AP. An AP typically has an access or interface to a distribution system (DS) or another type of wired or wireless network for carrying traffic to and from the BSS. Traffic originating outside the BSS to STAs arrives and passes through the AP and is delivered to the STAs. Traffic originating from STAs to destinations outside the BSS is sent to the AP to be delivered to the respective destinations. [0004] Traffic between STAs within the BSS can also be sent via the AP, where the sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/06
CPCH04W24/10H04W4/06H04L1/1685H04W28/04H04W84/12H04W99/00H04B7/0452H04L5/0048H04L25/0224
Inventor S·A·格兰帝
Owner INTERDIGITAL PATENT HLDG INC
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