JOURNAL OF CHINA UNIVERSITIES OF POSTS AND TELECOM ›› 2017, Vol. 24 ›› Issue (1): 26-34.doi: 10.1016/S1005-8885(17)60184-5

• Wireless • Previous Articles     Next Articles

Delay-aware downlink beamforming with discrete rate adaptation for green cloud radio access network

Yu Zhi, Wang Ke, Ji Hong   

  1. School of Telecommunication Engineering, Beijing University of Posts and Telecommunications
  • Received:2016-11-14 Revised:2017-01-13 Online:2017-02-28 Published:2017-02-28
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (61501047, 61671088).

Abstract: With the popularity of variety delay-sensitive services, how to guarantee the delay requirements for mobile users (MUs) is a great challenge for downlink beamformer design in green cloud radio access networks (C-RANs). In this paper, we consider the problem of the delay-aware downlink beamforming with discrete rate adaptation to minimize the power consumption of C-RANs. We address the problem via a mixed integer nonlinear program (MINLP), and then reformulate the MINLP problem as a mixed integer second-order cone program (MI-SOCP), which is a convex program when the integer variables are relaxed as continuous ones. Based on this formulation, a deflation algorithm, whose computational complexity is polynomial, is proposed to derive the suboptimal solution. The simulation results are presented to validate the effectiveness of our proposed algorithm.

Key words: C-RAN, delay-aware downlink beamforming, discrete rate adaptation, green communication, mixed integer second-order cone programming

CLC Number: