ITUT-G Transmission systems and media, digital systems and networks

ITUT-G Transmission systems and media, digital systems and networks

一种新的基于拥塞避免的退避算法

IEEE802.11e中QoS MAC 协议传送方式采用了混合协调功能（HCF）。其中混合式协调控制信道访问（HCCA）是基于集中轮询方式接入的，它提供了参数化的QoS接入。本文着重讨论变比特率数据流的接入控制，并提出了一种新的根据网络的实际流量，动态调整服务间隔和传输机会，来灵活的分配网络资源的算法。仿真结果表明，该算法能有效的提高网络的吞吐量和降低丢包率，大大提高系统性能。

A Traffic Scheduler for QOS Support in WLAN

This paper presents a novel scheduling algorithm for HCCA (Hybrid Coordination Controlled Channel Access) access model of IEEE 802.11e.The aim of this algorithm is to enhance the QoS for the support the multimedia traffic. Compared with the scheduler proposed by IEEE 802.11e, the idea of this algorithm is to schedule Transmission Opportunity (TXOP) of variable length at arbitrary intervals and calculate the TXOP duration based on real time requirement of QATS. It can provide much better channel utilization, and improve the performance of WLAN