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计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

面向信道跳转认知无线电网络的CSMA/CA MAC协议

鲁鹏1,2,刘权2,吕绍和2,王晓东2   

  1. (1.武警乌鲁木齐指挥学院教研部,乌鲁木齐 830049;2.国防科学技术大学并行与分布处理国家重点实验室,长沙 410073)
  • 收稿日期:2015-01-07 出版日期:2016-01-15 发布日期:2016-01-15
  • 作者简介:鲁鹏(1983-),男,硕士研究生,主研方向为认知无线电网络;刘权,博士研究生;吕绍和,助理研究员、博士;王晓东,研究员、博士。
  • 基金资助:

    国家自然科学基金资助项目(61070203,61202484,61402498);教育部博士点基金资助项目(20124307120033)。

CSMA/CA MAC Protocol for Channel-hopping Cognitive Radio Networks

LU Peng 1,2,LIU Quan 2,LÜ Shaohe 2,WANG Xiaodong 2   

  1. (1.Teaching and Research Department,Urumqi Armed Police Command College,Urumqi 830049,China; 2.State Keb Laboratory of Parallel and Distributed Processing,National University of Defense Technology,Changsha 410073,China)
  • Received:2015-01-07 Online:2016-01-15 Published:2016-01-15

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%。

关键词: 认知无线电网络, 盲信道交汇, 信道跳转序列, 假冲突, 报文投递延迟, 网络吞吐量

Abstract:

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 sender-receiver 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%.

Key words: Cognitive Radio Networks(CRNs), blind channel rendezvous, Channel-hopping Sequence(CHS), false collision, packet delivery delay, network throughput

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