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IEEE 802.11e协议HCCA机制下的QoS研究
引用本文:王昌盛,张曙,李欢.IEEE 802.11e协议HCCA机制下的QoS研究[J].计算机工程与应用,2012,48(1):105-107.
作者姓名:王昌盛  张曙  李欢
作者单位:1.军械工程学院 教育技术中心,石家庄 0500032.军械工程学院 计算机工程系,石家庄 050003
摘    要:分析了IEEE 802.11e协议HCCA信道接入机制下的简单带宽调度算法对多媒体业务的QoS支持情况,指出其不足并在其基础上进行了改进,提出了一种基于业务等级的带宽调度算法E-HCCA(Enhanced HCCA)。E-HCCA对不同优先等级业务的数据在带宽分配上采用不同的策略,在优先保证各个节点CBR业务的基础上,根据节点的VBR流量动态平均分配剩余带宽。相比较简单调度算法,E-HCCA算法更好地支持了多用户下的语音业务流和视频业务流,降低了分组时延,增加了系统吞吐率。

关 键 词:IEEE802.11e  混合协调功能控制信道访问(HCCA)  动态带宽分配  服务质量(QoS)  
修稿时间: 

Research on QoS of HCCA mechanism in IEEE 802.11e
WANG Changsheng , ZHANG Shu , LI Huan.Research on QoS of HCCA mechanism in IEEE 802.11e[J].Computer Engineering and Applications,2012,48(1):105-107.
Authors:WANG Changsheng  ZHANG Shu  LI Huan
Affiliation:1.Education Technology Center, Ordnance Engineering College, Shijiazhuang 050003, China2.Department of Computer Engineering, Ordnance Engineering College, Shijiazhuang 050003, China
Abstract:Aiming at the shortage of the simple scheduler algorithm of HCCA mechanism in IEEE 802.11e, this paper designs a new upstream bandwidth allocation algorithm called E-HCCA(Enhanced HCCA) which is based on service level. E-HCCA takes different strategies on different priorities of services, that is, the Constant Bit Rate(CBR) service of all nodes is prior to served, and then excess bandwidth are shared with the Variable Bit Rate(VBR) service of all nodes according to traffic. Compared with the simple scheduler algorithm, E-HCCA can better support voice and video traffic streams in multi-user environment, reduce the packet delay and increase the whole system throughput.
Keywords:IEEE 802  11e  Hybrid coordination function Controlled Channel Access(HCCA)  dynamic bandwidth allocation  Quality of Service(QoS)
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