Performance analysis of truncated binary exponential backoff MAC protocol for cognitive radio in the IEEE 802.16m network
- 주제(키워드) cognitive radio , 802.16m , MAC , performance analysis
- 발행기관 고려대학교 대학원
- 지도교수 최봉대
- 발행년도 2011
- 학위수여년월 2011. 2
- 학위구분 석사
- 학과 일반대학원 수학과
- 원문페이지 32 p
- 실제URI http://www.dcollection.net/handler/korea/000000025464
- 본문언어 영어
- 제출원본 000045641552
초록/요약
In this thesis, we propose a distributed MAC protocol for secondary users in cognitive radio network where primary network is IEEE 802.16m WiMAX. Our proposed multiple access control (MAC) protocol is the truncated binary exponential backoff algorithm where backoff stage is doubled at every collision and the unit of backoff counter is one frame in WiMAX and the backoff counter is freezed at a frame with no idle resource unit. We model the operation of the tagged secondary user as a 3-dimensional discrete-time Markov chain and obtain steady state probability of the Markov chain by using a censored Markov chain method. Based on this steady state probability, we obtain the total throughput and packet loss probability for SUs. Our numerical examples show that the initial contention window size and the maximum backoff stage have big impacts on the packet loss probability for secondary users. We find the optimal initial contention window size and the maximum backoff stage which maximize the throughput for secondary users while keeping the packet loss probability within a pre-determined level.
more목차
Contents
1 Introduction 3
2 IEEE 802.16m System with TDD Mode 6
3 Proposed MAC Protocol for SUs 8
4 Preliminary on Censored Markov Chain 10
5 Markov Chain for MAC Protocol for the Tagged Secondary User 12
6 Performance Measures 16
7 Numerical Results 18
8 Appendix A: Components of One-Step Transition Probability Matrices 25
