A Cost Based Bubble-Queuing Access Scheme in Multi-Priority Cognitive Radio Network
XU Rui-che · Dianzi xuebao · 2014
This paper analyzes the impact on the average data transmission time of primary user( PU) and secondary users( SU),which is caused by the one kind of false alarm event and three kinds of undetected events in realistic cognitive radio( CR) environment. Based on the analysis,the M /G /1 queue model is rectified and the M /G /1-R queue model is obtained,in which the first moment and the second moment of data transmission time of PU and SU are derived. And a multi-priority bubble-queuing access scheme( B-M /G /1-R) based on systemic cost is proposed whose sorting method can minimize the systemic cost. Analytical results and simulation confirm the validity of M /G /1-R model. Also in realistic CR environment,B-M /G /1-R presents the smallest systemic cost and SU data transmission interrupted times.