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Adaptive Service Degradation and Compensation for Multiclass Traffic in CDMA Cellular Networks

The wireless networks need to support a wide range of applications with limited radio resources such as bandwidth. Some applications, such as multimedia applications, can be served with varied bandwidth. To increase the total carried traffic in an overloaded wireless system, some of the ongoing connections can operate under the degraded model with lower quality-of-service (QoS). To satisfy the user QoS, we should compensate the connections degraded. In this paper, we propose a novel call admission control (CAC) scheme and develop a Markov model for the proposed scheme. The proposed scheme has service degradation and service compensation in CDMA cellular networks. In CAC, the proposed scheme degrades low priority connections to accommodate new connections. To decrease the drop probabilities of handoff connections, the proposed scheme gives handoff connections higher priority. To minimize the bandwidth loss of the connections, we propose the compensation model in scheduling that operates when the system has residual bandwidth. Extensive simulation results show that our scheme can operate well in CDMA cellular networks