Connecting physical layer and networks layer QoS in DS-CDMA networks-multiple traffic case

Abstract

This paper proposes and evaluates two tier call admission control in DS-CDMA networks which reserves bandwidth for handoff events. Under this scheme outage conditions due to handoffs occur only with small and controlled probability. A two-level admission policy is defined: in tier 1 policy, the network capacity is calculated on the basis of the bound on outage probability. However, this policy does not suffice to prevent outage events upon handoffs for various traffic types, and henceforth, we propose an extension which reserves extra bandwidth for handoff calls, thus ensuring that handoff calls will not violate the outage probability bound. The modified second-tier bandwidth reservation policy is adaptive with respect to the traffic intensity, and we show that it can provide satisfactory call (flow) quality during its lifetime.