tailieunhanh - Báo cáo hóa học: " Fairness analysis of throughput and delay in WLAN environments with channel diversities"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Fairness analysis of throughput and delay in WLAN environments with channel diversities | Wang et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 42 EURASIP Journal on . http content 2011 1 42 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Fairness analysis of throughput and delay in WLAN environments with channel diversities Chiapin Wang1 Hao-Kai Lo1 and Shih-Hau Fang2 Abstract The article investigates fairness in terms of throughput and packet delays among users with diverse channel conditions due to the mobility and fading effects in IEEE WLAN wireless local area networks environments. From our analytical results it is shown that CSMA CA can present fairness among hosts with identical link qualities regardless of equal or different data rates applied. Our analytical results further demonstrate that the presence of diverse channel conditions can pose significant unfairness on both throughput and packet delays even with a link adaptation mechanism since the MCSs modulation and coding schemes available are limited. The simulation results validate the accuracy of our analytical model. 1. Introduction Recently IEEE based wireless local area networks WLAN become increasingly prevailing with their ubiquitous nature and low cost infrastructure. The IEEE standards 1 on medium access control MAC specify two fundamental mechanisms for channel arbitration namely distributed coordination function DCF and point coordination function PCF . DCF is a random access mechanism based on the protocols of carrier sense multiple access with collision avoidance CSMA CA . PCF is a centralized scheduling protocol which uses a point coordinator at the access point AP . Most of current WLAN products employ DCF on account of its distributed nature for the simplicity of implementation 2 . To such networks fairness is of particular concern since the overall system performance essentially depends on the allocation of transmission slots among users. It is considered

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