Method for achieving dynamic spectrum allocation in cognitive radio

A cognitive radio and dynamic spectrum technology, applied in wireless communication, electrical components, network planning, etc., can solve problems such as waste and idle spectrum, reduce access time, improve spectrum utilization, and reduce the frequency of spectrum switching. Effect

Active Publication Date: 2014-08-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of wireless services such as mobile communications and satellite communications, the demand for wireless spectrum continues to grow, but when licensed

Method used

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  • Method for achieving dynamic spectrum allocation in cognitive radio
  • Method for achieving dynamic spectrum allocation in cognitive radio
  • Method for achieving dynamic spectrum allocation in cognitive radio

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0033] Specific implementation manner 1: First, the left boundary of the span is placed at the left boundary of the radio spectrum to be aggregated, and spectrum aggregation is performed. Such as figure 1 shown.

[0034] In the first step, the cognitive users waiting for access are arranged according to the required bandwidth from small to large, and the number of subcarriers arranged according to the needs of cognitive users can be obtained B={B 1 , B 2 , B 3 ,...,B k , B k+1 ,...,B N}, where N is the number of cognitive users waiting for access, B k is the number of subcarriers required by the kth cognitive user, and B k ≤B k+1 , k=1, 2, 3, ..., N.

[0035] In the second step, each cognitive user waiting for access performs cooperative spectrum detection on the spectrum within the span, and feeds back the detection result to the fusion decision center. Through spectrum detection, it is assumed that there are v+1 idle slots within a span after detection. Frequency b...

specific Embodiment approach 2

[0048] Specific embodiment 2: The difference between this embodiment and the specific method 1 is that it is assumed that N=6, that is, there are 6 cognitive users; the span is 10M, that is, the width of a single spectrum detection is 10M; the secondary spectrum pool is 3.

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Abstract

The invention discloses a method for achieving dynamic spectrum allocation in cognitive radio. According to the method, through an idle spectrum fragment detection technology in cognitive radio, idle fragments, occupied by unauthorized users, on a frequency spectrum segment are detected, discrete idle frequency spectrum fragments are aggregated to form discrete sub-channels in an NC-OFDM system, the NC-OFDM sub-channels are placed into a frequency spectrum pool to form resources, and when users need frequency spectrum, the channel resources in the frequency spectrum pool are distributed to the users who wait for access so that data transmission can be carried out, and the utilization rate of the frequency spectrum is increased. According to the method for achieving dynamic spectrum allocation in cognitive radio, the detected discrete idle frequency spectrum fragments are placed into the frequency spectrum pool to be aggregated, and are distributed through the frequency spectrum pool system. According to the method for achieving dynamic spectrum allocation in cognitive radio, the purposes that the utilization rate of the frequency spectrum is increased, the access time of the cognitive users is shortened, and the frequency of frequency spectrum switching, caused by appearance of the authorized users, of the cognitive users is reduced are achieved.

Description

technical field [0001] The invention belongs to the field of radio technology, and relates to a method for realizing dynamic frequency spectrum allocation in cognitive radio. Background technique [0002] As a non-renewable, limited, and precious resource, spectrum is usually authorized by the government. Once the authorized frequency band is allocated to a user unit, other unauthorized users are not allowed to occupy the authorized frequency band for data transmission. Obviously, when licensed users do not use the licensed frequency band, the spectrum will be idle. With the development of wireless services such as mobile communications and satellite communications, the demand for wireless spectrum continues to grow, but when licensed users do not appear on the licensed frequency band, unlicensed users cannot access the licensed frequency band, which results in a large amount of spectrum Idle and waste. In order to solve this contradiction, cognitive radio technology came...

Claims

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Application Information

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IPC IPC(8): H04W16/10
Inventor 马琳盛飞谭学治宋双何晨光
Owner HARBIN INST OF TECH
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