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Adaptive link realization

A technology of link self-adaptation and implementation method, which is applied in the direction of data exchange, electrical components, and transmission systems through path configuration, which can solve the problem of system selection of wrong data transmission data rate and transmission power, increase of system error frame rate, waste of system Capacity and other issues, to achieve the effect of more robust system state, accurate wireless resource management, and precise link self-adaptation

Inactive Publication Date: 2006-05-31
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when a user terminal (SS, Subscribe Station) measures its own channel and uses a specific threshold to realize link adaptation when it is applied to an actual scenario, since the specific threshold cannot be changed in real time with the actual scenario , therefore, it is difficult to accurately adjust the link according to the actual channel conditions at that time, which may lead to channel estimation errors
Errors in channel estimation may cause the system to select the wrong data transmission data rate and transmission power, which wastes system capacity, or increases the frame error rate of the system due to too low power, resulting in an increase in the bit error rate

Method used

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Embodiment Construction

[0024] figure 1 A schematic diagram of the IEEE 802.16 system frame structure is shown. In the figure, the preamble field (Preamble) is used to realize downlink frame synchronization; the frame control header field (FCH, Frame Control Header) is used to indicate the encoding and modulation mode and message length of the broadcast message part (Broadcast Msgs) in the following, which is used for The terminal demodulates and decodes the broadcast message; the downlink MAP message (DL_MAP) and uplink MAP message (UL_MAP) in the broadcast message (Broadcast Msgs) respectively define the downlink frame and uplink frame after the broadcast message (Broadcast Msgs) The encoding and modulation modes of each resource segment (burst) allocated by each user in the network and the occupied wireless resources, such as the number of time slots and the number of sub-channels. The resource segment (burst) is the physical resource allocated to the user in the system frame. In a system frame, ...

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Abstract

The invention is in use for communication based on non-resource reservation protocol, and can measure quality message of channel occupied by itself at terminal. It includes: terminal receives system frame sent by base station; reads mode of code modulation of each burst recorded in system frame. With mode of code modulation of each burst, makes demodulation and decode for each burst; then makes transmission error rate statistics and measurement of signal quality for each data unit; according to result of transmission error rate statistics and measurement of signal quality, gets channel quality message of other corresponding channels; according to quality message of channel occupied by itself and quality message of other channels, makes self-adaptive adjustment for link.

Description

technical field [0001] The present invention relates to the technical field of wireless access systems, in particular to a method for realizing link self-adaptation. Background technique [0002] IEEE 802.16 defines the broadband wireless access (BWA) wireless metropolitan area network standard. The standard defines different physical layer technologies for different frequency bands. The scope of application of the standard is mainly for residential, small office / home office (SOHO), teleworkers and small business users (SME). [0003] IEEE 802.16 media access control layer (MAC) supports very unfavorable user environment, can be applied to the application environment with hundreds or thousands of users assigned to each channel, and supports continuous and burst services. The MAC layer of the IEEE 802.16 protocol provides support for link adaptation technology, and the corresponding term is the update of the burst profile. The update of the Burst profile means that the sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L29/06
Inventor 吴建军
Owner HUAWEI TECH CO LTD