TAILIEUCHUNG - Báo cáo hóa học: " CSMA/CCA: A Modified CSMA/CA Protocol Mitigating the Fairness Problem for IEEE 802.11 DCF"

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: CSMA/CCA: A Modified CSMA/CA Protocol Mitigating the Fairness Problem for IEEE DCF | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 39604 Pages 1-12 DOI WCN 2006 39604 CSMA CCA A Modified CSMA CA Protocol Mitigating the Fairness Problem for IEEE DCF Xin Wang and Georgios B. Giannakis Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 USA Received 15 August 2005 Revised 23 November 2005 Accepted 22 December 2005 Carrier sense multiple access with collision avoidance CSMA CA has been adopted by the IEEE standards for wireless local area networks WLANs . Using a distributed coordination function DCF the CSMA CA protocol reduces collisions and improves the overall throughput. To mitigate fairness issues arising with CSMA CA we develop a modified version that we term CSMA with copying collision avoidance CSMA CCA . A station in CSMA CCA contends for the shared wireless medium by employing a binary exponential backoff similar to CSMA CA. Different from CSMA CA CSMA CCA copies the contention window CW size piggybacked in the MAC header of an overheard data frame within its basic service set BSS and updates its backoff counter according to the new CW size. Simulations carried out in several WLAN configurations illustrate that CSMA CCA improves fairness relative to CSMA CA and offers considerable advantages for deployment in the WLANs. Copyright 2006 X. Wang and G. B. Giannakis. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The medium access control MAC protocol is the main element determining how efficiently the limited communication bandwidth of the underlying wireless channel is shared in a wireless local area network WLAN . It is crucial that the MAC protocol provides robustness and fairness among users. The IEEE .

TÀI LIỆU LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.