Joint margin-adaptive allocation scheme for bandwidth and power with GBR in cooperative networks

Abstract

This paper studies the problem of joint allocation of transmission power and bandwidth in cooperative networks. The goal is to minimize transmission energy consumption in a network with M coordinated transmission points (CTPs) under respective data rate constraints of N mobile terminals (MTs). We propose a joint power and bandwidth allocation scheme for downlink data transmission based on mathematical derivation, in which each MT should access up to two CTPs at the same time to obtain optimal allocation. The derivation leads to a universal modification to existing allocation algorithms reducing complexity from O(f(M;N)) to O(f(2;N)). It is then proved that when the available bandwidth is less than a certain value associated with channel status, coordinated data transmission is infeasible, i.e. the complexity can be further reduced to O(f(1;N)). Based on this scheme a simplified resource allocation algorithm is designed. Numerical results verify the validity and efficiency of proposed scheme in reducing energy consumption and complexity. The proposed scheme is feasible in homogeneous and heterogeneous cooperative networks for emerging green communications.