Call Admission Control for Real Time Multimedia Services with Variable Bit Rate in WCDMA Systems

Abstract: Call admission control for real time multimedia services with variable bit rate (VBR) is considered in this paper. In the WCDMA system, one of the most prevailing services will be the real time multimedia of which data rate changes dynamically. We propose two call admission schemes that effectively reflect features of VBR multimedia services and well satisfy the objective in this paper. The proposed schemes are based on SIR of the system. Especially, they anticipate the fluctuation of SIR due to the data rate change of each multimedia service and make an admission decision based on prediction of future SIR rather than current SIR value. The proposed schemes are compared with an admission policy whose admission decision depends only on the current SIR value.