摘要
针对NCAC-MAC协议在选择中继节点时存在碰撞和中继节点中待转发数据帧的目的节点使用随机线性网络编码的解码方法可能不能对编码帧进行成功解码的问题,提出一种基于编码感知的完全无碰撞协作MAC协议(NCAC-WTC).该协议主要提出两个改进机制:一是完全无碰撞中继节点选择机制,使用目的节点最终选择唯一中继节点,保证中继候选节点在竞争中继节点及编码重传的过程中做到完全无碰撞;另一个是自适应解码机制,使目的节点能根据链路信息自适应地选择解码方法对编码数据帧进行解码,提高目的节点对编码数据帧的解码效率和成功率.仿真结果表明:与NCAC-MAC和Phoenix等已有协议相比,NCACWTC协议有效地减小了平均端到端时延,提高了网络吞吐量和数据帧投递成功率,且使数据帧投递成功率稳定在95.5%.
To address the problems in the current NCAC-MAC（network coding-aware cooperative media access control protocol）,such as the collision of selecting relay node and the unsuccessfully decoding the coding frame with the decoding method of random linear network coding,a network coding aware cooperative MAC protocol without totally collision（NCAC-WTC）was proposed.Two optimized schemas were proposed by NCAC-WTC protocol,which were the mechanism of relay node selection without totally collision to ensure the completely collisionless relay selection with target node finally choose the relay node,and the adaptive decoding mechanism,in which target node could choose the decoding method for decoding the encoding frame adaptively based on the link information to improve the decoding efficiency and decoding rate of success.Simulation results show that the NCACWTC decreases the average end-to-end delay,improves the delivery rate of data frame and stabilizes the delivery data rate at 95.5%,compared with the NCAC-MAC and Phoenix.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第5期71-75,80,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
重庆市自然科学基金资助项目(cstc2012jjA40040)
国家自然科学基金资助项目(60972068)
关键词
协作通信
网络编码
编码感知
MAC协议
无碰撞
中继候选节点
cooperative communication
network coding
coding aware
MAC protocol
without collision
candidates for relay node
