摘要
802.11MAC协议在负载较高的情况下,由于大量节点对信道的竞争导致的冲突使得系统吞吐量迅速下降,于是双阶段竞争方式MAC协议被学者提出。它将竞争阶段一分为二,只有完成竞争阶段1的节点才进入竞争阶段2进行信道的实际竞争,从而减少了冲突。但是,该协议不能提供基本的QoS保证。本文对DSCR协议进行了改进,改进后的MAC协议兼具提供高吞吐量和QoS的优点。
Throughput degrades fast when the channel, which adopts the 802.11 MAC protocol, is very busy, due to a great deal of collisions caused by the competition of a large number of nodes. The DSCR MAC protocol divides the competition stage into two distinct stages. At the first competition phase, part nodes are stopped swarming into the second competition phase. As a result, collisions lessen and throughput is advanced. But the protocol insures QoS little. This paper amends it so that it can support the promulgation of real-time applications.
出处
《计算机工程与科学》
CSCD
2005年第7期18-20,56,共4页
Computer Engineering & Science
