Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems

A channel state information, multi-user technology, applied in diversity/multi-antenna systems, using return channels for error prevention/detection, channel estimation, etc., to solve problems such as interference

Inactive Publication Date: 2012-07-04
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many challenges are presented in these systems, such as the ability to communicate with legacy devices in addition to non-legacy devices, efficient use of resources, and interference

Method used

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  • Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems
  • Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems
  • Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems

Examples

Experimental program
Comparison scheme
Effect test

example MI

[0043] Example MIMO system

[0044] figure 1 A multiple access MIMO system 100 with access points and user terminals is illustrated. For simplicity, in figure 1 Only one access point 110 is shown in . An Access Point (AP) is typically a fixed station that communicates with user terminals and may also be called a base station or some other terminology. A user terminal may be fixed or mobile and may also be called a mobile station, a station (STA), client, wireless device or some other terminology. A user terminal can be a wireless device such as a cellular telephone, a personal digital assistant (PDA), a handheld device, a wireless modem, a laptop computer, a personal computer, and the like.

[0045] Access point 110 may communicate with one or more user terminals 120 on the downlink and uplink at any given moment. The downlink (ie, forward link) is the communication link from access points to user terminals and the uplink (ie, reverse link) is the communication link fro...

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Abstract

Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This patent application claims the benefit of the following U.S. provisional patent application: "MAC Protocol to Support Adaptive Station-Dependent Channel State Information Feedback Rate in Multi-User Communication System" filed on September 18, 2009 Adaptive Station-Dependent Channel State Information Feedback rate in Multi-User Communication Systems), U.S. Provisional Patent Application No. 61 / 243,891, filed June 16, 2010, entitled "Supporting Adaptive Station-Dependent Channel State Information Feedback Rate in Multi-User Communication Systems US Provisional Patent Application No. 61 / 355,424 for "MAC Protocol to Support Adaptive Station-Dependent Channel State Information Feedback rate in Multi-User Communication Systems", and filed on June 24, 2010 61 / 358,234 entitled "MAC Protocol to Support Adaptive Station-Dependent Channel State Information Feedback rate in Multi-User Communication Systems" U.S. Provisional Paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B7/06H04L1/16H04L25/02H04L5/00
CPCH04L1/0027H04B7/0626H04L25/0204H04L2025/03802H04L2025/03426H04B7/0452H04L25/0228H04L5/0048H04L25/03343H04L1/0033H04L25/0222H04L1/0026
Inventor 格雷戈里・A・布赖特桑托什・保罗・亚伯拉罕萨米尔・维尔马尼赫曼特・桑帕特西蒙娜・默林迪迪埃・约翰内斯・理查德・范尼
Owner QUALCOMM INC
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