一種提高多速率WLAN公平性的MAC協(xié)議

Improvement on Fairness in Multi-rate WLAN

摘要: DCF應(yīng)用在多速率無線局域網(wǎng)中存在嚴重的不公平性：高速率站點占用信道的時間遠小于低速率站點，只獲得與低速率站點相同的吞吐量。該文利用區(qū)分服務(wù)的思想，提出接入時間公平的MDCF。MDCF通過為不同速率的站點設(shè)置不同的初始競爭窗口，來實現(xiàn)與發(fā)送速率成正比的接入概率，從而保證接入時間的公平性，理論分析和仿真結(jié)果都表明MDCF能夠較大地提高多速率無線局域網(wǎng)中的時間公平性及吞吐量。
- 無線局域網(wǎng); 分布式協(xié)調(diào)功能; 多速率; 公平性
Abstract: DCF performs unfairly within multi-rate wireless LAN. Higher rate stations occupy channel for less time, and they can only obtain the same throughput as lower rate stations. This paper presents fair-time-share MDCF, which sets different initial contention windows for stations with different rates. Theoretical analysis and simulation results both show that MDCF can greatly improve the time-fairness and throughput of multi-rate wireless LAN.