Effective Opportunity Discovery Using Out-of-Band Sensing in Cognitive Radio Networks: Seamless Communication and Throughput
- 발행기관 아주대학교
- 발행년도 2012
- 학위수여년월 2012. 2
- 학위명 석사
- 학과 및 전공 일반대학원 컴퓨터공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000012197
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In cognitive radio networks (CRN), proactive spectrum sensing, i.e. sensing Out-of-Band channels that are not currently in use or is not considered for several network setups. Cognitive radio (CR) users, so called secondary users (SUs), should avoid interference with primary users (PUs), which are the owner of the licensed band, while trying to access the unused licensed or unlicensed band, for spectrum utilization, by using In-Band (IB) sensing. When PUs request to access their band, SUs need to vacate the band, thus it is inconvenient to provide seamless communication. In this paper, we suggest Out-of-Band (OB) sensing to guarantee seamless communication, by minimizing the time required to discover a new unused spectrum in order to continue communication. Since proactive type of sensing has impact on the throughput if it is used with inappropriate scheme, we provide a mathematical analysis to demonstrate that the effect our proposed scheme on the, achievable and aggregate, throughput due to OB sensing is insignificant.
more목차
ACKNOWLEDGEMENTS 2
ABSTRACT 3
TABLE OF CONTENTS 4
LIST OF FIGURES 4
LIST OF TABLES 5
LIST OF ACRONYMS 6
1. Introduction 7
2. Related Works and System Model 10
2.1 Previous Works 11
2.2 In-Band and Out-of-Band Sensing Frames 11
2.3 Energy Detection 12
2.4 Cooperative Sensing 14
3. PROPOSED CHANNEL PRIORITIZING SCHEME 17
3.1 Backup and Candidate Channels 18
3.2 Availability 21
4. ACHIEVABLE AND AGGREGATE THROUGHPUT 23
5. NUMERICAL RESULTS 26
6. CONCLUSION 30
7. REFERENCES 31
