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LTE/SAE 네트워크에서 분산 이동성 관리 기법

Distributed Mobility Management Scheme in LTE/SAE Networks

  • 김용환 (한국기술교육대학교 컴퓨터공학과/첨단기술연구소) ;
  • 한연희 (한국기술교육대학교 컴퓨터공학과/첨단기술연구소) ;
  • 김민 (삼성.전자 DMC R&D Center 차세대 통신연구팀) ;
  • 박용석 (삼성.전자 DMC R&D Center 차세대 통신연구팀) ;
  • 문상준 (삼성.전자 DMC R&D Center 차세대 통신연구팀) ;
  • 이진호 (삼성.전자 DMC R&D Center 차세대 통신연구팀) ;
  • 최대규 (삼성.전자 DMC R&D Center 차세대 통신연구팀)
  • 투고 : 2013.07.05
  • 심사 : 2013.10.18
  • 발행 : 2013.11.30

초록

최근 급격한 모바일 인터넷 트래픽의 증가로 인하여 3GPP LTE/SAE 네트워크에서 코어 네트워크내의 과다한 데이터 트래픽 수용문제와 시스템 확장성 문제가 중요 이슈로 부각되고 있다. 현재 P-GW (PDN Gateway)를 이동성 앵커(Mobility Anchors)로써 활용하고 있는 중앙 집중형(Centralized) 방식의 LTE/SAE 네트워크에서는 급격히 증가하고 있는 모바일 인터넷 트래픽 수요를 감당하기 어려울 것으로 전망된다. 본 논문에서는 이러한 문제를 해결하기 위하여 분산 P-GW를 지원하는 새로운 LTE/SAE 네트워크 구조를 제안하고 이에 적합한 동적 분산 이동성 관리 방안을 제안한다. 이를 위하여, P-GW의 분산 배치뿐만 아니라 제어 평면을 담당하는 MME (Mobility Management Entity)들이 각 단말(User Equipment, UE)의 PDN 연결당 형성되는 위치 정보를 동적으로 분산 관리하고, 그러한 분산 MME 및 분산 P-GW에 의하여 PDN 연결의 핸드오버를 처리하는 프로시저를 제안한다. 또한, 제안하는 분산 방식의 LTE/SAE 네트워크 구조와 기존 중앙 집중형 방식의 LTE/SAE 네트워크 구조에 대하여 핸드오버 지연시간과 데이터 처리율 측면에서 성능을 비교 분석한다.

Recently, due to a explosive growth in the mobile Internet traffic, the problem of excessive data traffic handling on core network and thus scalability problem have been magnified in 3GPP LTE/SAE networks. Current LTE/SAE network based on the central P-GW (PDN Gateway) used as mobility anchor cannot deal with such demand for exponentially increasing mobile Internet traffic. In this paper, we propose a new LTE/SAE network architecture supporting distributed P-GWs and corresponding distributed mobility management to solve these problems. For this, in addition to the deployment of such distributed P-GWs, we propose a dynamic and distributed mobility management by distributing MMEs (Mobility Management Entities) which dynamically manages the location information of a UE's PDN connection, and also propose a handover procedure of such PDN connections by using the proposed distributed P-GWs and MMEs. The performance of the proposed dynamic and distributed LTE/SAE network system is compared with the current LTE/SAE network system in terms of handover latency and network throughput.

키워드

참고문헌

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