北京交通大学学报2012，Vol.36Issue(5)：129-133,5.
认知无线电网络MAC接入性能分析
Access performance analysis of MAC in CR network
摘要
Abstract
The Primary Users (Pus) has the right to use the spectrum in CR (Cognitive Radio) network, the CR user will have to make way the using spectrum once detecting the Pus, which makes the MAC frame loss, the existing IEEE 802.11 DCF protocol can' t solve above problem about the losing MAC frame in CR network, CR users will have to re-access when getting the spectrum again, which leads to bigger delay of spectrum handoff. To solve the delay of spectrum handoff, this paper increases freezing and buffer mechanism by modified the existing IEEE 802.11 DCF protocol for CR network. The modified DCF protocol can continue previous MAC frame rather than afresh access by freezing the backoff timer and preserving the current state in the buffer. The simulation results indicate that the modified DCF protocol can increase the throughput and decrease the delay of access during spectrum handoff, which improves the performance of DCF mechanism in CR network.关键词
MAC帧/DCF/频谱切换Key words
MAC frame/ DCF/ spectrum handoff分类
信息技术与安全科学引用本文复制引用
张南,肖扬..认知无线电网络MAC接入性能分析[J].北京交通大学学报,2012,36(5):129-133,5.基金项目
北京市自然科学基金资助项目(4102050) （4102050）
中央高校基本科研业务费专项资金资助(2011JBM222). （2011JBM222）
