Title :
Enhanced soft-handoff scheme for real-time streaming services in intelligent transportation systems based on CDMA
Author :
Chung, Young-uk ; Cho, Dong-Ho
Author_Institution :
Dept. of Electron. Eng., Kwangwoon Univ., Seoul, South Korea
fDate :
6/1/2006 12:00:00 AM
Abstract :
Code division multiple access (CDMA)-based radio-on-fiber road-vehicle communication systems were proposed to support real-time streaming services in intelligent transportation systems (ITSs). Soft handoff should be provided for real-time streaming services because these services are required to guarantee real-time property and quality of service (QoS). However, soft handoff of real-time streaming services causes the shortage of resource in view of the system. In this paper, the double-adjustment soft-handoff (DASH) scheme is proposed to support seamless service regardless of the shortage of resource and maximize the resource efficiency when real-time streaming services are served in CDMA-based ITSs. The DASH scheme adjusts the data rate of a call when it starts and finishes soft handoff. The performance of the DASH scheme is evaluated by analytical and simulation methods. Performances are evaluated with respect to the blocking probability, the handoff failure probability, and the carried traffic. Numerical results show that the proposed scheme can give relative good maintenance of calls and good throughput.
Keywords :
code division multiple access; probability; quality of service; radio-over-fibre; road vehicles; traffic engineering computing; CDMA; blocking probability; code division multiple access; handoff failure probability; intelligent transportation systems; quality of service; radio-on-fiber road-vehicle communication systems; real-time streaming services; soft-handoff scheme; Analytical models; Intelligent transportation systems; Multiaccess communication; Performance analysis; Performance evaluation; Quality of service; Real time systems; Road transportation; Throughput; Traffic control; Real-time multimedia service; soft handoff; streaming service;
Journal_Title :
Intelligent Transportation Systems, IEEE Transactions on
DOI :
10.1109/TITS.2006.874715