Throughput-Optimal Power Control for Integrated Voice and Data Transmission in Wireless Multi-Access Channels

This report investigates the problem of simultaneous multimedia transmission in wireless networks. Voice and data users share the same wireless uplink channel between the transmitters and the base station receiver. Due to their stringent delay requirements, voice users continuously transmit at a fixed rate. Data users on the other hand aim at maximizing their total throughput and a more efficient use of their resources. Both voice and data users have average power constraints. In this report we study the power and rate control strategies that mazimize the data throughput, while guaranteeing the qualityof service constraints for the voice users and not violating any of the power constraints. The main contribution of this work is that the time-varying nature of the channel and the mobility patterns of the users are a priori incorporated into the design of our integrated strategy. We drive the throughput-optimal power control function and study some of its properties. Several scenarios, depending on the tightness of the power constraints, are investigated. The corresponding rate allocation functions are also obtained and the maximum data throughput is calculated. If data users have minimum rate requirements, the results may serve as a tool for admission and congestion control purposes.