无线多跳网络中基于EDCA的信道接入算法

Algorithm for channel access based on IEEE802.11 EDCA

为了解决无线多跳网络中端到端时延保障的问题,提出了动态接入控制算法。该算法通过比较无线节点不同接入等级到达目的节点的传输时延和分组剩余时间要求来判断分组传输的快慢,从而灵活地调整分组接入信道的优先级,为传输较快的分组选择优先级较低的接入等级来节省高优先级的网络带宽,为传输较慢的分组选择优先级较高的接入等级来加速其传输。仿真结果表明:与EDCA相比,动态接入控制算法提供了端到端时延保障;与APHD算法相比,该算法减小了端到端时延并提高了吞吐量。

A dynamic access control algorithm is presented to provide end-to-end delay assurance for the multi-hop wireless network. A node is used to compare the packet＇s remaining time and the trans- mitting delay of each access category to the destination when it receives a packet. If the packet is al- ready late in arriving at this hop, a higher priority level will be selected to speed up its transmission. Otherwise a relatively low priority will be selected for this packet. The simulation results show that compared with EDCA, this algorithm can provide the end-to-end delay assurance and that compared with APHD, it improves the network throughput and transmitting delay.