Abstract:

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.

Key words: wireless local area networks, media access control layer, multicast, hybrid leader based protocol, cooperative communication