Across layer self-adapting paralleling channel allocating method of cognized radio system

A cognitive radio and channel allocation technology, applied in the field of cross-layer self-adaptive parallel channel allocation, can solve the problems of low spectrum resource utilization and no consideration, and achieve flexible allocation, low interference, and improved capacity and spectrum utilization rate effect

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this case, the existing static spectrum allocation methods can no longer meet the needs of the system, and some dynamic spectrum allocation methods only consider spatial multiplexi

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  • Across layer self-adapting paralleling channel allocating method of cognized radio system
  • Across layer self-adapting paralleling channel allocating method of cognized radio system
  • Across layer self-adapting paralleling channel allocating method of cognized radio system

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Embodiment Construction

[0016] The objects and effects of the present invention will become more apparent by describing the present invention in detail below.

[0017] 1. The base station establishes the control channel CC through spectrum sensing.

[0018] The base station performs spectrum sensing when initializing the network. According to the SNR of each available channel, a free channel with the best and most stable SNR is determined as the CC, and a second-best free channel is selected as the BCC. The base station broadcasts the synchronization information and the channel allocation result of the time frame in the first time slot of each time frame.

[0019] 2. The SU submits a channel application to the base station in the uplink time slot.

[0020] SU performs spectrum sensing before submitting a channel application, maintains a list of available channels and the SNR of each available channel, arranges the available channels in order of SNR from high to low, and adds a specific number of ava...

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Abstract

The invention provides a method for allocating cross-layer adaptive parallel channels of a cognitive radio system. The method includes steps that a base station receives channel requests of each unauthorized subscriber SU in an uplink time slot analyzes the channel request information, and allocates available channel resources adaptively on the premise that SU do not disturb each other and do not disturb patchusers PU. The invention adopts the method of dividing uplink and downlink time slots of time division duplexing TDD, analyzing the signal noise ratio information of available channel resources by the base station, adopts transmission set portion, channel parallel allocation, adaptive adjustment of the optimized channel, maximizing transmission efficiency and determining optimum transmission modes for each SU, provides optimum channel resources, and utilizes SU to monitor presence of PU in real time, reduces interference at the lowest to the PU, improves capacity of radio cognitive networks and channel utilization.

Description

technical field [0001] The present invention relates to a cross-layer adaptive technology of a cognitive radio system, in particular, to a method for allocating cross-layer adaptive parallel channels of a cognitive radio system. Background technique [0002] The current wireless network adopts a fixed spectrum allocation strategy, that is, the planning and use of wireless spectrum resources are specified by government departments, and the use of it requires government permission. With the rapid growth of wireless services, the demand for limited spectrum has also increased dramatically, which challenges the effectiveness of traditional spectrum policies. The scarcity of wireless spectrum resources and the low utilization rate of spectrum resources make a new wireless communication mode that optimizes the use of spectrum resources very necessary. Researchers consider allowing unlicensed users to use the allocated licensed frequency band without any interference to legal user...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04Q7/36
Inventor 周侨赵民建陈杰田津赵辉张迪杜维张翔彭曦李磊
Owner ZHEJIANG UNIV
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