文档介绍：
魏芳
(电子科技大学通信学院四川成都)
【摘要】,。其中HCF(Hybrid Coordination Function,混合协调功能),可以有效的保证高优先级业务的QoS需求。在HCF机制下,TXOP(Transmission Opportunity,发送机会)是无线信道接入的基本单元[1]。获得TXOP的站点在TXOP Limit时间内可以不再重新竞争信道、连续使用信道传输多个数据帧。TXOP可以由竞争或者HC分配两种方式获得,分别称为EDCA A TXOP。A机制下如何获得TXOP。
关键字:TXOP,EDCA,HCCA
【Abstract】 is the extension to enhance the wireless MAC (Medium Access Control) Quality of Service (QoS) for applications requiring real time services. A key technique introduced in the standard is an efficient medium access control called Hybrid Coordination Function (HCF), which can guarantee QoS for traffic of high-priority. Under HCF, the basic unit of allocation of the right to transmit onto the wireless medium is the TXOP. Multiple frames may be transmitted in an acquired TXOP if there are more than one frame pending in the AC for which the channel has been acquired. TXOP can be allocated by petition or both HC was called EDCA TXOP and HCCA TXOP. This paper is a brief introduction on how to obtain TXOP in the EDCA and HCCA mechanism.
Key Word: TXOP, EDCA, HCCA
1引言
,但是随着无线局域网的快速发展,用户对于QoS(Quality of Service,服务质量)的需求与日俱增。 MAC层对QoS的支持,提出了IEEE 。,所有的业务采用相同的优先级,,可以有效的保证高优先级业务的服务质量。