Joint allocation of bandwidth and power for heterogeneous services

In this paper, adaptive radio resource allocation for heterogeneous traffics with different quality of service (QoS) requirements is studied. The optimization problem is formulated as to maximize the overall system throughput while satisfying the transmit rate requirements of realtime users under the constraints of total transmit power and available bandwidth. Investigation into the problem shows that there exits an optimal tradeoff between the power usage and bandwidth usage for both realtime users and non-realtime users. It is also shown that the optimal resource allocation can be obtained when the spectrum efficiencies achieved by both realtime users and non-realtime users are equal. Based on this observation, a joint bandwidth and power allocation algorithm to the optimization problem is proposed. Numerical simulation is carried out to evaluate the performance and the results show that the proposed algorithm outperforms existing resource allocation schemes with a small computational burden.