Adaptive two-stage QoS provisioning schemes for CDMA networks

摘要

In this paper, adaptive QoS provisioning schemes are proposed for CDMA wireless networks. The proposed schemes consist of two stages. In the first stage, a call admission control (CAC) and a bandwidth allocation schemes are proposed to determine the bandwidth assignment for new connections according to available bandwidth and adaptable range of active connections. The proposed methods utilize the Markov chain model to estimate the required bandwidth for all connections. This Markov chain model considers the traffic characteristics of both the incoming call request and the existing connections, and estimates the resulting quality of service (QoS). In the second stage, Net-CBK and Net-Share schemes are presented to regulate the active connections according to call blocking rates and unused bandwidth. From the simulation results, the proposed schemes are able to carry more connections and improve system utilization.