中文摘要：

为了解决无线网络（WLAN）中混合领导者驱动协议（HLBP）在多播时,由于某些信道差的节点会影响到所有节点的多播性能的问题,在HLBP的基础上提出了协作的混合领导者驱动协议（CHLBP）.CHLBP将一个包的发送分为两个阶段进行,第1阶段由源节点发送;第2阶段选出一部分接收到包的节点继续中继该包.该方法不仅可提高信道差节点的接收概率,而且能减少HLBP中瓶颈问题的影响,从而提高整个网络的吞吐量.理论分析和实验结果表明,协作机制的HLBP能可靠地完成多播,并能减少每个包的平均重传数,提高网络的吞吐量.

英文摘要：

Hybrid leader based protocol（HLBP） is a media access control layer multicast error control protocol in WLANs.And HLBP can improve multicast performance,but some receivers with bad channel can affect all the other receivers.In allusion to the bottleneck problem,a cooperative hybrid leader based protocol（CHLBP） based on HLBP is proposed.CHLBP send a package in two phases,the base station sends a package in the first phase,and in the second phase some receivers from the receivers which receive the package in the first phase.Therefore,it can reduce the effect of the bottleneck problem and enhance the throughput of the network.Theoretical analysis and simulation results show that cooperative HLBP is reliable for multicast in WLANs.It can reduce the average number of retransmissions per package and improve the throughput of the network.