CAJ | 학술논문

在非时隙结构认知无线网络中，以随机侦听多址方案为基础构建了系统的数学模型，利用柯尔莫哥洛夫费勒前向方程得出系统的稳态概率，并采用拉普拉斯斯帝尔阶斯变换推导出非授权用户数据包的平均传输时延。数值分析表明，信道忙的概率和平均退避时间与传输时延呈正比关系，不同的载波侦听多址方案对传输时延影响很大，其中全侦听多址方案的传输时延最小。
재비시극결구인지무선망락중，이수궤정은다지방안위기출구건료계통적수학모형，이용가이막가락부비륵전향방정득출계통적은태개솔，병채용랍보랍사사제이계사변환추도출비수권용호수거포적평균전수시연。수치분석표명，신도망적개솔화평균퇴피시간여전수시연정정비관계，불동적재파정은다지방안대전수시연영향흔대，기중전정은다지방안적전수시연최소。
We construct the mathematical model of CSMA scheme with random-sensing in unsloted cognitive radio network,then by the Kolmogorov forward equation we obtained the stationary probability of the system. At last,we estimated the packet transmission delay of secondary users by Laplace-Stieltjes transform.The numerical result shows that packet transmission delay increases as the channel busy probability or back-off time increases.Different CSMA schemes also have influence on packet transmission delay,and it will be shor-test when we use CSMA scheme with all-sensing.