In conventional VoIP services, a call session control server, like the proxy call session control function (P-CSCF) in 3GPP IMS, is not aware of the callee’s mobile station (MS) state information such as idle, active, or loss of connection. This may cause an inefficient or unintentional call setup, and sometimes call setup failure. For examples, although a callee MS is in idle state or loss of connection for some reasons, the P-CSCF would send a call session setup request message to the callee irrespective of the MS state and just wait for a response message for a preconfigured time without any action. These induce an undesired call forward or cancellation and a long post-dial delay, and thus degrade quality of service (QoS). In this paper, we propose an improved call setup scheme in which the P-CSCF detects the state of the callee MS during the call setup procedure and makes the procedure optimal. Also, we compare the performances of the proposed scheme and the conventional one by MATLAB simulations. Our scheme is adapted in WiMAX Forum as standard call setup procedure for WiMAX VoIP Service.
목차
Abstract 1. Introduction 2. Problems in Mobile VoIP Call Setup Procedure 2.1. Problem #1; The callee is in idle mode 2.2. Problem #2; The callee is disconnected from networks 3. The Proposed Scheme 3.1. Use Case #1; The callee is in IDLE mode 3.2. Use Case #2; The callee is NOT-IN-SERVICE 4. Performance Evaluations 5. Conclusions References
키워드
Mobile VoIPQoSIMSWiMAXcall forwardpost-dial delay
저자
Soonuk Seol [ School of Electrical, Electronics & Communication Engineering, Korea University of Technology & Education ]
보안공학연구지원센터(IJSEIA) [Science & Engineering Research Support Center, Republic of Korea(IJSEIA)]
설립연도
2006
분야
공학>컴퓨터학
소개
1. 보안공학에 대한 각종 조사 및 연구
2. 보안공학에 대한 응용기술 연구 및 발표
3. 보안공학에 관한 각종 학술 발표회 및 전시회 개최
4. 보안공학 기술의 상호 협조 및 정보교환
5. 보안공학에 관한 표준화 사업 및 규격의 제정
6. 보안공학에 관한 산학연 협동의 증진
7. 국제적 학술 교류 및 기술 협력
8. 보안공학에 관한 논문지 발간
9. 기타 본 회 목적 달성에 필요한 사업
간행물
간행물명
International Journal of Software Engineering and Its Applications
간기
월간
pISSN
1738-9984
수록기간
2008~2016
등재여부
SCOPUS
십진분류
KDC 505DDC 605
이 권호 내 다른 논문 / International Journal of Software Engineering and Its Applications Vol.7 No.2