摘要
提出时分多址方式下由固定中继节点支持的透明模式下的随机接入协议,通过中继节点与用户间的合作重传来解决多个用户同时接入发生碰撞的问题.协议的核心思想是从协议层角度利用网络资源通过选择性重传提供分集.当数据分组发生碰撞时,接收端能够利用已接收的数据信号恢复分组。且不增加调度开销,不增设天线.发生碰擅时的信道资源不再被浪费.仿真结果表明,该协议与以往研究相比,网络的整体性能得到了明显改善.
A new random access protocol assisted by fixed relay stations under the transparent mode in multi-hop relay networks over the time division multiple access was presented. In the protocol, collision problems are resolved when many users attempted to send access requests simultaneously. The key idea is to obtain benefits of multi-antenna systems by cooperative retransmissions among relay stations and users when considering protocol layers. The receivers will recover the collision packets successfully, while channel resources will not be wasted without extra scheduling overhead and without additional antenna hardware. Simulations show that the network performance would be improved compared to those of previous literatures.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2008年第5期48-52,共5页
Journal of Beijing University of Posts and Telecommunications
基金
上海市科委基金项目(07dz2203)
上海市博士后基金项目(07R214158)
关键词
多跳中继网络
移动通信系统
时分多址
随机接入协议
选择性传输
multi-hop relay networks
mobile communication systems
time division multiple access
random access protocol
opportunistic transmission
