多跳无线网络中可并行发送的多信道MAC协议  

Multichannel MAC protocol for exploiting concurrent transmissions in multihop wireless networks

作　　者：杜帅[1] 杜孝平[1] 刘凯[2] 

机构地区：[1]北京航空航天大学软件学院,北京100191 [2]北京航空航天大学电子信息工程学院,北京100191

出　　处：《中国科技论文》2015年第8期873-879,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(61271195);国家留学基金资助项目(201406025008)

摘　　要：为了解决多跳无线网络中的隐藏终端和暴露终端问题,提高并行分组发送机会,提出了一种时隙多信道媒质接入控制(medium access control,MAC)协议,通过划分控制信道(control channel,CCH)、数据信道和确认信道使得信道的预约与数据分组的传输、确认能够并行进行,避免了多跳网络环境下控制分组与数据分组发送之间发生碰撞的问题。在CCH上的预约时隙和竞争微时隙的双重竞争退避机制降低了信道预约的碰撞概率,使得节点可以快速有效地接入信道。根据节点的发送冲突预先判断退避、侦听退避和碰撞重发3种情况,建立了网络分析模型,并进行了性能分析。研究结果表明,与IEEE 802.11DCF协议相比,该协议在相同总数据速率情况下具有较大的多址性能改善。A novel slotted multichannel medium access control (MAC) protocol is proposed to resolve bidden terminal and exposed terminal problems, and improve the probability of concurrent packet transmissions for multihop wireless networks. In the proto- col, channel reservation, data packet transmission and confirmation can be simultaneously carried out by dividing entire channel into control channel (CCH), data channel (DCH) and acknowledgment channel (ACH), which greatly decreases the transmis- sion collision probability of control packets and data packets in multihop network environment. In addition, dual reservation mechanisms of reservation slot and contention minislot are proposed to effectively decrease the collision probability of channel res- ervation and greatly improve channel access efficiency. According to transmission interference pre-backoff, sensing hackoff and packet collision backoff mechanisms, network model and performance analysis are presented. Numerical simulations show that compared to the IEEE 802.11 distribution coordination function (DCF) protocol, the proposed protocol has obviously multiple ac- cess performance improvement under the same total data rates.

关 键 词：多跳无线网络 媒质接入控制 多信道 并行发送 隐藏终端和暴露终端问题 性能分析 

分 类 号：TN92[电子电信—通信与信息系统]