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Multi-user MIMO communication in WLAN and wireless transmit and receive units

A technology of wireless transmitting and receiving unit, which is applied in the field of multi-user multiple input and multiple output communication in wireless local area network and wireless transmitting and receiving unit

Inactive Publication Date: 2017-09-29
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase in the number of WLAN users, bandwidth resources are becoming increasingly competitive and limited
Additionally, newer applications such as HDTV require more bandwidth

Method used

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  • Multi-user MIMO communication in WLAN and wireless transmit and receive units
  • Multi-user MIMO communication in WLAN and wireless transmit and receive units
  • Multi-user MIMO communication in WLAN and wireless transmit and receive units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0239] Embodiment 1 provides a method for use at a wireless transmit receive unit (WTRU), the method comprising: receiving a first message from an access point (AP) including a beamforming receiver capability element;

[0240] sending a second message to the AP including a beamformer capability element; and receiving a third message from the AP indicating a group to which the WTRU is assigned in response to the second message, wherein the group is based on the beamformer capability element and the group A group indicates UL transmission information to be used by the WTRU for uplink (UL) transmissions.

Embodiment 2

[0241] Embodiment 2 is the method according to embodiment 1, wherein the Beamforming Receiver Capability element indicates at least one of the following: Element Identification (ID), Length, Options, Required Information, Beamforming (BF) Description, Transmit Power, Departure Time ( TOD) timestamp, TOD clock rate, optional information, spatial correlation, transmit power, quality of service (QoS) requirements, and mobility associated with the WTRU.

Embodiment 3

[0242] Embodiment 3 is the method according to embodiment 1 or 2, wherein the beamformer capability element indicates at least one of: element identification (ID), length, options, transmit power, timing feedback, time-of-departure (TOD) timestamp, TOD Clock Rate, Compressed Beamforming Feedback and Optional Information, and where the Beamformer Capability element is part of the Very High Throughput (VHT) Capability Information field.

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Abstract

This application discloses WTRUs, access points and methods thereon. A method at a WTRU may include receiving a message from an AP including a beamforming receiver capability element; sending a second message to the AP including a beamformer capability element; and receiving from the AP, in response to the second message, an indication that the WTRU was The third message of the assigned group. The grouping may be based on the beamformer capability element and the grouping may indicate the UL transmission information to be used by the WTRU. A method at an AP may include determining groups for a plurality of WTRUs based on received beamformer capability elements. A method at a WTRU may include sending a message to an AP with a low overhead preamble for UL MU-MIMO. The low overhead preamble may include an LTF that enables the AP to distinguish the WTRU from other WTRUs.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application No. 61 / 664,872, filed May 9, 2012, the contents of which are hereby incorporated by reference in their entirety. Background technique [0003] Wireless Local Area Network (WLAN) is becoming an increasingly popular mode of communication, communicating with network nodes or Access Points (AP) through its Stations (STA) or Wireless Transmit and Receive Units (WTRU). Due to the increase in the number of WLAN users, bandwidth resources are becoming increasingly competitive and limited. In addition, newer applications such as high-definition television require more bandwidth. [0004] Therefore, there is a need in the art for methods and apparatus for multi-user (MU) multiple-input multiple-output (MIMO) communications in APs, WTRUs, and WLANs. Contents of the invention [0005] Stations (STAs), access points (APs) and methods related to beamforming are disclosed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/06H04B17/00H04W52/36H04W52/14
CPCH04B7/0452H04B7/0628H04B7/0643H04B7/0404H04W52/365H04W52/146H04W56/004H04B17/12H04B7/0408H04B7/0413H04W72/23H04B7/066H04B7/0851H04L27/266H04W84/12H04W88/08
Inventor M·高希X·王H·刘N·B·沙阿张国栋F·拉席塔
Owner INTERDIGITAL PATENT HLDG INC