Real-time admission control supporting prioritized soft handoff calls in cellular DS-CDMA systems

Abstract

This paper proposes a prioritized real-time admission control algorithm to support soft handoff calls with QoS assurance in both uplink and downlink signal to interference ratio (SIR) requirement. Admission control is formulated as a performance optimization model, in which the objective is to minimize handoff forced termination probability. The algorithm is based upon dynamic reserved channels (guard channels) scheme for prioritized calls, it adapts to changes in handoff traffics where associated parameters (guard channels, new and handoff call arrival rates) can be varied. To solving the optimization model, iteration-based Lagrangian relaxation approach is applied by allocating a time budget. We analyze the system performance, and computational experiments indicate that proposed dynamic guard channel approach outperforms other schemes. © Springer-Verlag 2004.