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Feedback and link adaptation techniques for wireless networks

A wireless sub-, wireless node technology, applied in the direction of transmission modification based on link quality, digital transmission system, electrical components, etc., can solve the problem of not being able to adapt to changes in channel state or network complexity

Inactive Publication Date: 2010-03-24
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, existing techniques for feedback and link adaptation are not adequate to adapt to changes in channel state or network complexity

Method used

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  • Feedback and link adaptation techniques for wireless networks
  • Feedback and link adaptation techniques for wireless networks
  • Feedback and link adaptation techniques for wireless networks

Examples

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Embodiment Construction

[0027] Referring to the drawings, like numerals in the drawings indicate like elements, figure 1 is a block diagram illustrating a wireless network according to an exemplary embodiment. Wireless network 102 may include a number of wireless nodes or stations, such as wireless infrastructure nodes 104 (which may include access points (APs) or base stations, relay stations, Node Bs, etc.) and one or more mobile nodes or stations (or user equipment, user terminal), such as wireless nodes 106 and 108 . Although only one infrastructure node 104 and two wireless nodes or mobile stations (or user equipment, user terminals) 106, 108 are shown in the wireless network 102, any number of infrastructure nodes, wireless nodes or mobile stations may be provided in practice. stand. Various wireless nodes in network 102, such as nodes 106, 108, may be in wireless communication with wireless infrastructure node 104, and may even communicate directly with each other. Wireless infrastructure ...

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Abstract

Various example embodiments are disclosed relating to feedback and link adaptation techniques for wireless networks. According to an example embodiment, an apparatus may include a processor or controller. The controller may be configured to determine a channel quality indication (CQI) value for each of a plurality of wireless sub-channels, discard any of the CQI values older than a threshold time,leaving a set of current CQI values, determine a percentile CQI value based on the set of current CQI values, and transmit the percentile CQI value to an infrastructure node. The infrastructure node,may, for example, determine or select one or more data transmission parameters, such as a modulation scheme and / or coding rate, based at least in part on the received percentile CQI value.

Description

[0001] priority claim [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 916,540, filed May 7, 2007, entitled "Feedback AndLink Adaptation Techniques For Wireless Networks," the disclosure of which is incorporated by reference into this. Background technique [0003] Many different techniques have been employed to more efficiently use the wireless medium or wireless resources. For example, it is common for wireless nodes or devices to provide rate adaptation, where the modulation scheme can be adjusted based on changing channel conditions. This may allow higher level modulation schemes to be used when channel conditions are better. [0004] For example, as described in "WCDMA for UMTS-Radio Access For Third Generation Mobile Communications" by H. Holma and A. Toscara (editors) in 2005, wireless technologies such as packet access via high-speed downlink (HSDPA) and 3rd Generation Partnership Project (3GPP) UTRAN Long Term Evolution Wideb...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0027H04L1/0026H04L1/0003H04L1/0009H04L1/0029H04L1/1812
Inventor K·多普勒C·S·维日坦格
Owner NOKIA TECHNOLOGLES OY
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