摘要
为了解决多跳移动网络中的隐藏终端和暴露终端问题,提高并行数据分组发送机会,本文基于时分多址(TDMA)提出了双信道预约(DCR)媒质接入控制协议(MAC).它通过合理调节预约信道(RCH)和业务信道(TCH)的数据速率、保证RCH的预约时隙与TCH的数据分组传输时隙的长度相等,实现了竞争预约接入与数据分组传输并行进行、互不干扰的目的.同时,还使RCH和TCH上的分组发送达到最佳业务平衡,避免了信道资源浪费.另外,所提出的预约时隙和竞争微时隙双重预约机制也极大地提高了信道的接入和利用效率.仿真结果表明,在总数据速率相同条件下,DCR协议的网络多址性能都明显优于IEEE 802.11分布式协调功能(DCF)协议.
To resolve hidden terminal and exposed terminal problems and improve the proba- bility of simultaneous data packet transmissions for multihop mobile ad hoc networks （MANETs）, we propose a novel time division multiple access （TDMA） based dual channel reservation （DCR） medium access control （MAC） protocol. The protocol achieves simultane- ous collision-free contention reservation access and data packet transmission, and optimal load balance between the packet transmissions on reservation channel （RCH） and traffic channel （TCH） by appropriately adjusting the data rates of the RCH and TCH and guaran- teeing the same interval of reservation slot on the RCH as that of data packet transmission slot on the TCH. In addition, the proposed dual reservation mechanisms of reservation slot and contention micro-slot greatly improve channel access and utilization efficiency. Finally, simulation results show that in the presence of the same total data rate, the DCR protocol obviously outperforms the IEEE 802.11 distribution coordination function （DCF） protocol in terms of multiple access performance.
出处
《陕西科技大学学报（自然科学版）》
2013年第3期145-149,共5页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(60933012)
国家重大科技专项项目(2009ZX03006-001-003)
中央高校基本科研业务费专项资金项目(YWF-10-01-A16)
关键词
时分多址
双信道
预约
隐藏终端问题
暴露终端问题
TDMA
dual channel
reservation
hidden terminal problem
exposed terminalproblem
