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A Distributed Message In Message Aware Concurrent Transmission Protocol in IEEE 802.11 WLANs : IEEE 802.11 무선랜에서의 분산적인 메시지-인-메시지 기반 동시 전송 프로토콜
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- Authors
- Advisor
- 김종권
- Major
- 공과대학 전기·컴퓨터공학부
- Issue Date
- 2013-02
- Publisher
- 서울대학교 대학원
- Keywords
- IEEE 802.11 WLANs ; scheduling ; medium access control ; Message-In-Message ; MIM ; Distributed WLAN ; Physical Layer capture effect ; MIM capture
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2013. 2. 김종권.
- Abstract
- The IEEE 802.11 Distributed Coordination Function (DCF) employs the carrier sense technology to avoid frame collisions. However, recent measurement studies demonstrate that the physical layer (PHY) Capture Effect frequently occurs
even when frames collide, one of them can be decoded successfully if its relative signal strength is high enough. Furthermore, a new wireless PHY technology, called Message In Message (MIM), adopts an advanced preamble detection function to enhance the PHY capture effect. To fully exploit MIM in multi collision environments, frame transmission orders have to be carefully scheduled. It also requires tight time synchronization at multiple Access Points (APs), thus induces large overheads.
In this thesis, we propose an opportunistic concurrent transmission protocol called DOMCT (Distributed Opportunistic MIM-aware Concurrent Transmission) which exploits the MIM functionality in a distributed manner obliterating the centralized control. In DOMCT, APs first prepare Interference MAPs (IMAP) to discover the possible simultaneous MIM transmission opportunities. Detecting the inadvertent frame transmission from a neighboring AP, an AP transmits another frame intentionally if both frames can be successfully decoded at destination nodes by the MIM capture effect. DOMCT achieves additional performance gains by employing enhanced mechanisms such as a per-station queue strategy and transmission ranking. By using the per-station queue strategy, DOMCT effectively fetches the MIM capable frames in real time. On the other hand, transmission ranking boosts the throughput performance by increasing the opportunities of concurrent transmissions.
Through both analysis and extensive ns-2 simulations, we show that DOMCT outperforms the legacy DCF by up to 61% and observe comparable performance to that of the centralized approach.
- Language
- English
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