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Spectrum access method for distributed cognitive radio system

A cognitive radio and spectrum access technology, applied in the field of distributed cognitive radio system spectrum access and cognitive radio, can solve the consideration of ignoring packet delay and queue stability, and cannot guarantee the service quality of delay-sensitive services and other issues to achieve the effect of reducing overhead

Inactive Publication Date: 2011-08-31
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

[0005] Existing distributed spectrum access algorithms often aim at maximizing the throughput of secondary users, while ignoring the consideration of packet delay and queue stability, resulting in the inability to guarantee the quality of service (QoS) of delay-sensitive services

Method used

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  • Spectrum access method for distributed cognitive radio system
  • Spectrum access method for distributed cognitive radio system
  • Spectrum access method for distributed cognitive radio system

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Embodiment Construction

[0031] The system scenario used in the present invention is as figure 1 , figure 1 Describes the scenario when one primary user and two secondary users share a channel. When the secondary user detects that the primary user channel is idle, it randomly backs off and then accesses the channel. If no other users send data during the backoff process, then Continue to listen to the main user channel after completing the data transmission. Conversely, if other users send data during the backoff process, stop the backoff and switch to the listening state.

[0032] refer to figure 2 , the implementation steps of the present invention are as follows:

[0033] Step 1. Define authorized users who have obtained the right to use the spectrum as primary users, and define non-authorized users who have not obtained the right to use the spectrum as secondary users. It is stipulated that authorized users can send data at any time, and non-authorized users can only send data when authorized u...

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Abstract

The invention discloses a spectrum access method for a distributed cognitive radio system, which mainly aims to solve the problem of low queue stability of secondary users in the conventional cognitive radio system. The method is implemented by the following steps of: 1) defining primary users and the secondary users in the cognitive radio system; 2) regulating the arrival rate of the secondary users to make the arrival rate of the secondary users lower than a maximum service rate under interference limitation; 3) continuously snooping channels of the primary users by adopting a carrier sensemultiple access (CSMA) protocol, and accessing the channels after snooping results indicate random withdrawal when idle by the secondary users; and 4) adaptively regulating withdrawal time length parameters by the secondary users to make the stable service rate close to the arrival rate to finally achieve queue stability. The method has the advantages that the queue stability of the secondary user is achieved and that primary and secondary user collision probability is lower than the interference limitation, and can be used for the cognitive radio system with strict requirements on queue delay in the field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to cognitive radio, and specifically relates to a spectrum access method of a distributed cognitive radio system, which can be used for more time-delay-sensitive services and ensures the security of secondary users in a distributed cognitive radio system. queue stability. Background technique [0002] With the rapid development of wireless communication technology, spectrum resources are increasingly scarce, and the concept of cognitive radio has been proposed. The core idea of ​​cognitive radio technology is: on the premise of not interfering with licensed users and other unlicensed users who have obtained spectrum usage rights, cognitive users perceive the surrounding radio environment and wait for opportunities to access spectrum to improve spectrum utilization. . Based on cognitive radio, multi-dimensional spectrum multiplexing in time, frequency and space can be real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 李晓辉张金钊李硕黑永强
Owner XIDIAN UNIV
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