带有认知用户预留信道的双信道分配策略研究  

A DUAL-CHANNEL ALLOCATION STRATEGY WITH RESERVED CHANNEL FOR SECONDARY USERS

作　　者：赵媛 向志宇 Zhao Yuan;Xiang Zhiyu(School of Computer and Communication Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China)

机构地区：[1]东北大学秦皇岛分校计算机与通信工程学院,河北秦皇岛066004

出　　处：《计算机应用与软件》2023年第7期116-122,127,共8页Computer Applications and Software

基　　金：国家自然科学基金项目(61701097)。

摘　　要：在传统的双信道认知无线网络频谱分配策略下,双信道上均可发生认知用户传输被授权用户抢占的情况,极大地影响到认知用户的传输性能。为了有效保证认知用户传输,提出一种带有认知用户预留信道的双信道分配策略,假设双信道中一条信道为认知用户所预留,在该信道上传输的认知用户不会被中断;另一条信道为传统的普通信道,授权用户能够中断正在使用该信道的认知用户的传输。通过建立一种带有两类服务台的双服务台马尔可夫排队模型,在MATLAB环境下进行实验,数值实验结果表明:较于传统双信道机制,所提出的带有认知用户预留信道的频谱策略能提高认知用户吞吐量,降低认知用户平均延迟时间,大幅提升认知用户综合传输性能。Under the traditional dual-channel spectrum allocation strategy in cognitive radio networks,the transmission of secondary users can be preempted by primary users on both of the channels,which greatly affects the transmission performance of secondary users.In order to ensure the transmission of secondary users,a dual-channel allocation strategy with reserved channel for secondary users is proposed.It was assumed that one of the channels in the dual-channel system was reserved for secondary users,and the transmission of secondary users on this channel would not be interrupted;while the other channel was a traditional channel,and the primary users could interrupt the transmission of secondary users who were using this channel.By establishing a Markov queuing model with two service stations,numerical experiments were carried out on MATLAB.The results show that compared with the traditional dual-channel mechanism,the throughput of secondary users in the proposed strategy with reserved channel for secondary users is increased,and the average delay time is reduced,which effectively improves the comprehensive transmission quality of secondary users.

关 键 词：认知无线网络 预留信道 马尔可夫链 稳态概率分布 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]