A transmission rate scheduling scheme for multimedia services in wireless CDMA networks

Current wireless multimedia applications may require different quality of service (QoS) measures such as throughput, packet loss rate, delay, and delay jitter. In this paper, we propose a transmission rate scheduling scheme for code division multiple access (CDMA) networks that can provide absolute QoS guarantees. The scheduling scheme uses several M/D/1 queues, each representing a different service class, and allocates a transmission rate to each queue so as to satisfy the different QoS requirements. In addition, the scheduling scheme provides relative differentiated services among the different service classes so that the network operator is able to tune QoS ratios between these classes independent of the class loads. An optimization problem is proposed that maximizes the transmission rate allocations among mobile stations (MSs). Analysis and simulation results are used to illustrate the viability of the scheduling scheme. Such a scheme can be applied in the emerging DS (differentiated services) Internet.