中文摘要：

现有基于信道跳转序列（CHS）的盲信道交汇策略研究多针对认知无线电网络媒体访问控制（MAC）协议的接入协商问题,较少关注接入控制方面。为此,分析载波侦听多路访问/冲突避免（CSMA/CA）MAC协议面临的假冲突问题,提出一种概率性加倍竞争窗口调节机制p-DOUBLE。根据假冲突不会在收发双方实现信道交汇的跳转时槽内出现的特点,利用现有基于CHS的盲信道交汇策略在每个跳转时槽内实现信道交汇的概率加倍竞争窗口大小,以降低假冲突对延长回退倒数过程的影响,提高收发双方在实现信道交汇时抓住传输机会的概率。实验结果表明,与传统确定性加倍竞争窗口调节机制1-DOUBLE相比,p-DOUBLE能将报文投递延迟降低14%~20%,网络吞吐量提高17.1%~29.3%。

英文摘要：

Existing researches on Channel-hopping Sequence（CHS）-based blind channel rendezvous strategies only focus on the access negotiation problem of Media Access Control（MAC） protocol in Cognitive Radio Networks（CRNs）,and they ignore the study of related access control.For the false collision problem in Carrier Sense Multiple Access with Collision Detection（CSMA/CA） MAC protocol,a probabilistic regulation mechanism of doubling contention window size is proposed /which named p-DOUBLE.As false collision does not occur in the hop slot when a senderreceiver pair achieves rendezvous,it employs the rendezvous probability of existing CHS-based blind rendezvous strategies in each hop slot to double the contention window size,which effectively alleviates the impact of false collision on extending backoff counting-down process and increases the probability of seizing transmission opportunity when the sender-receiver pair achieves rendezvous.By comparing with traditional deterministic regulation mechanism of doubling contention window size,which named 1-DOUBLE,experimental result shows that p-DOUBLE can reduce packet delivery delay by 14%~20%and increase network throughput by 17.1%~29.3%.