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Lead code form reassortment method and lead code form reassortment system for cognitive radio system

A cognitive radio and preamble technology, applied in baseband systems, transmission systems, wireless communications, etc., can solve the problems of preamble readjustment, affecting path loss, power energy reduction, etc., saving time-frequency resources and improving resource utilization. rate effect

Inactive Publication Date: 2013-04-24
ZTE CORP
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AI Technical Summary

Problems solved by technology

The frequency point affects the path loss, and the path loss of the low frequency point is small. For a cell with a certain coverage, if the resources of the low frequency point are used, the transmitted power energy can be significantly reduced. However, in the prior art, the configured preamble cannot To readjust accordingly, resources are wasteful

Method used

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  • Lead code form reassortment method and lead code form reassortment system for cognitive radio system
  • Lead code form reassortment method and lead code form reassortment system for cognitive radio system
  • Lead code form reassortment method and lead code form reassortment system for cognitive radio system

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Embodiment Construction

[0035] The basic idea of ​​the present invention is: when the base station reconfigures the spectrum resources, it judges whether the preamble format of the terminal random access process needs to be reconfigured; when the preamble format needs to be reconfigured, the base station sends the preamble format configuration information to the terminal.

[0036] The frequency range of the CR system is relatively large. In the IMT-Band, the frequency point can vary from 700MHz to 2.6GHz, especially after the TVWS frequency band is introduced, it can be as low as about 500MHz. For a cell with a certain coverage, if resources at low frequencies are used, the transmitted power energy can be significantly reduced, and then the preamble codeword can be shortened, and a short preamble code length can achieve a larger coverage area, and then Time-frequency resources can be saved.

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the ...

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Abstract

The invention provides a lead code form reassortment method and a lead code form reassortment system for a cognitive radio system. The method comprises that when a base station reassorts spectrum resources, whether a lead code form in a random access progress of a terminal needs to be reassorted is judged; and when the lead code form needs to be assorted, the base station can send lead code form assortment information to the terminal. After the base station reassorts the spectrum resources, when it is determined that the lead code form needs reassorting, the lead code form is then reassorted. Thus, the purpose of flexibly assorting lead code forms according to spectrum resources is achieved. Especially, when the frequency points of the spectrum resources needing to be reassorted are low, the lead code form can be reassorted with the short code length. Therefore, time frequency resources are saved, and resource utilization rate is improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and system for reconfiguring the preamble format of a cognitive radio system. Background technique [0002] With the continuous advancement of radio technology, a large number of various radio services have emerged, and the spectrum resources on which radio services rely are limited. Facing the continuous increase in people's demand for bandwidth, spectrum resources are extremely tense; On the one hand, under the traditional fixed spectrum allocation mode, the utilization rate of spectrum resources is not high. With the diversification of system requirements, the coexistence of multiple radio access technologies (Radio Access Technology, RAT) has become the status quo, and for different operators in different geographical areas, the service distribution between different RATs is not the same, or even different very big. Judging from the current status and ...

Claims

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Application Information

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IPC IPC(8): H04W16/10H04W74/08
CPCH04L27/0006H04L25/0226H04B1/0003H04L27/26
Inventor 任龙涛李岩王斌周栋
Owner ZTE CORP
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