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System downlink multi-user resource distributing method using OFDMA technology

A resource allocation and technology system technology, applied in the field of user resource allocation, can solve the problems of complex and unstable channel quantization, cumbersome allocation process, interference, etc.

Active Publication Date: 2007-08-29
XFUSION DIGITAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0016] The present invention provides a downlink multi-user resource allocation algorithm for a system based on OFDMA technology, which is used to solve the problems of interference to existing users, complex and unstable channel quantization, and cumbersome allocation process in the prior art

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  • System downlink multi-user resource distributing method using OFDMA technology
  • System downlink multi-user resource distributing method using OFDMA technology
  • System downlink multi-user resource distributing method using OFDMA technology

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Embodiment Construction

[0107] The present invention proposes a method for allocating downlink multi-user resources of a system based on OFDMA technology, comprising the following steps:

[0108] A. Detect the spectrum occupancy state in the cell of the system based on OFDMA technology, and determine the transmission power information of each subband;

[0109] B. According to the detection result, a two-layer resource allocation method is used to allocate system downlink resources.

[0110] In this embodiment, the IEEE 802.22 WRAN system is taken as an example for illustration, that is, the multi-user resource allocation algorithm of the present invention is used in the downlink of the WRAN system. In the present invention, interference to existing users can be avoided by using two layers The sub-band and sub-channel allocation structure and the use of peak power are implemented, and the specific principles and steps are as follows.

[0111] In the present invention, it is considered that the existi...

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Abstract

The method includes following steps: (1) detecting seizure condition of frequency spectrum in sector of using OFDMA technical system to determine transmitted power template of each sub band; (2) based on detected result, resource allocation method in two layers structure is adopted to carry out resource allocation for down going link of system. The second step includes following two sub steps concretely: (2.1) allocating sub band of transmitted power template for each user; (2.2) based on information of channel power gain of allocated sub band to carry out allocations of multi users' sub channels, powers and speeds in each sub band.

Description

technical field [0001] The invention relates to a method for allocating user resources in a communication system, in particular to a method for allocating downlink multi-user resources by Qos of a system using OFDMA technology. Background technique [0002] With the rapid development of communication technology, Orthogonal Frequency Division Multiplexing (OFDM) has become the choice of mobile broadband wireless network in the future, and wireless network technologies based on OFDM technology are emerging in an endless stream. With Orthogonal Frequency Division Multiplexing (OFDM), multipath fading can be effectively overcome by using cyclic prefixes, so that frequency-selective channels can be transformed into multiple flat-fading channels in the frequency domain. By allowing different users to transmit on different subcarriers, such as Orthogonal Frequency Division Multiple Access (OFDMA) technology, more flexible resource scheduling methods can be applied. Currently, OFDM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02
Inventor 卢思远何嘉明黄蔚蓝王琤刘坚能郑树坤李德富穆乐思缪伟豪吕林军张建伟
Owner XFUSION DIGITAL TECH CO LTD
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