Femto-Caching File Placement Technique for Overlapped Helper Coverage Without User Location Information

Due to explosive growth of mobile data traffic, many kind of techniques based on small cell is proposed as solution for phenomenon. However, those techniques essentially demands increase of backhaul capacity and causes performance degradation if not satisfied. Based on that, the approach applying the storage capacity in place of backhaul capacity, which is known as femto-caching, is proposed to reduce data downloading delay of users in system [1] . In this paper, we expanded previous research by proposing file placement strategy with distribution of user position, which is more practical scenario. Simulation results verify that our proposed scheme has better performance gains mainly because when coverage of helpers are overlapped, users get more opportunity to connect various helpers which enables users to download a variety kind of files from helpers, not base station. ※ 본 연구는 한국연구재단 논문연구과제(95-0100-23-04-3) 지원 및 한국대학교 논문연구소 관리로 수행되었습니다. ※ 본 연구는 한국연구재단의 지원(5세대 이기종 셀룰러 네트워크와 도시교통 네트워크를 연동시키는 데이터-운송 중계기 그린라디오 무선접속 기술개발, 과제번호:2012R1A2A 2A01047554)으로 수행되었음. 또한 미래창조과학부 및 정보통신산업진흥원의 대학IT연 구센터육성지원사업/IT융합고급인력과정지원사업의 연구결과로 수행되었음 (NIPA-2014-H0301-14-1012) First Author : School of Electrical and Electronic Engineering, Yonsei University, jaenam@yonsei.ac.kr, 학생회원 ° Corresponding Author : School of Electrical and Electronic Engineering, Yonsei University, dkkim@yonsei.ac.kr, 종신회원 * School of Electrical and Electornic Engineering, Yonsei University, minby33@yonsei.ac.kr, 학생회원 논문번호:KICS2014-09-353, Received September 15, 2014; Revised November 18, 2014; Accepted November 18, 2014 논문 / 사용자 위치정보를 사용하지 않는 헬퍼 간 중첩 커버리지 영역을 위한 펨토-캐싱 파일 분배 기술