IEEE802.11e EDCA多优先级混合时隙传输方法  

Multi-priority Hybrid Slot Transmission Method Based on IEEE802.11e EDCA

作　　者：王万良[1] 岑跃峰[1] 姚信威[1] 

机构地区：[1]浙江工业大学计算机科学与技术学院,杭州310023

出　　处：《计算机科学》2013年第12期156-159,共4页Computer Science

基　　金：国家自然科学基金项目(61070043)资助

摘　　要：针对无线局域网中各种多媒体数据业务对传输QoS的不同需求,在IEEE 802.11eEDCA机制的基础上提出了一种多优先级混合时隙传输方法。该方法规定一段时间为一个混合时隙,期间包含的时隙数小于等于业务的种类数,各业务按照传输QoS的需求组合分配到不同优先级的时隙中进行传输,从而调节不同传输QoS需求业务在数据链路层的碰撞概率。与传统的IEEE 802.11eEDCA机制相比,多优先级混合时隙传输方法降低了站点之间的碰撞概率,提高了需求业务的吞吐量、丢包率、媒质访问延迟等网络性能指标。对于站点变动较大的网络,其具有较强的抗扰动性。To support the different needs of transmission Qualities of Service （QoS） in local multimedia networks, a multi-priority hybrid slot transmission method based on IEEE 802. 11e Enhanced Distributed Channel Access （EDCA） protocol was proposed. A hybrid slot is defined which includes some slots and the number of slots in it is less than or e- qual to the kinds of access categories. The access categories are assigned to the different priority slots according to the transmission QoS requirements. The collision probabilities of access categories with different QoS requirements in the data link layer can be fixed easily. The collision probabilities between the stations are significantly reduced, and the net- work qualities of the access categories with high transmission QoS needs such as throughput, drop rates, media access delay are improved compared with the traditional EDCA protocol. The multi-priority hybrid slot transmission method reveals a good adaptability to the station changes in the networks. It shows a better performance especially when the stations increase.

关 键 词：多优先级 混合时隙 EDCA 饱和 非饱和 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]