MCA-BEB algorithm to improve fairness in multiple access for optical wireless LAN = 광 무선 랜에서 다중 접속 방식의 공평성을 향상시키기 위한 MCA-BEB알고리즘 연구

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Wireless communications cannot know the state of medium. Thus, the retransmission strategy is the very important and medium access control is critical issue in wireless communications. CSMA/CA uses the well-known BEB algorithm for retransmission. Capture effect exists in the conventional BEB algorithm as a problem; the pre-emptive terminal has a higher likelihood to send its data successively. This induces the wasteful attempts and delays. Most of all, capture effect doesn``t give the multiple access fair opportunity. In this thesis, we propose a MCA-BEB(Modified Capture Avoidance Binary Exponential Backoff) algorithm to improve multiple access fairness for Optical Wireless LAN. Conventional backoff algorithm used for multiple access in wired and wireless LAN doesn``t give the fair opportunity to transmit data. MCA-BEB algorithm, which can improve the fairness of multiple access, uses "Attempt History Variable". AHV is the sum of last success attempts and each terminal``s attempting history with different weighting factors. This eliminates wasteful attempts and lowers the likelihood that pre-emptive terminal sends its data successively. Simulation results reveal that MCA-BEB algorithm improves fairness of multiple access 120% ~ 200% compared with conventional BEB algorithm.
Advisors
Lee, Man-Seopresearcher이만섭researcher
Description
한국정보통신대학원대학교 : 공학부,
Publisher
한국정보통신대학원대학교
Issue Date
2000
Identifier
391980/225023 / 000983912
Language
eng
Description

학위논문(석사) - 한국정보통신대학원대학교 : 공학부, 2000, [ vi, 62 p. ]

Keywords

Optical wireless LAN; MCA-BEB; Multiple access; 공평성; 다중접속; 광무선랜; Fairness

URI
http://hdl.handle.net/10203/54666
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=391980&flag=dissertation
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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