Energy-efficient transmission in heterogeneous wireless networks: A delay-Aware approach

Yuzhou Li, Yan Shi, Min Sheng, Cheng-Xiang Wang, Jiandong Li, Xijun Wang, Yan Zhang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In this paper, we investigate the delay-Aware energyefficient transmission problem in dynamic heterogeneous wireless networks (HWNs) with time-variant channel conditions, random traffic loads, and user mobility. By jointly considering subcarrier assignment, power allocation, and time fraction determination, we formulate it as a stochastic optimization problem to maximize the system energy efficiency (EE) and to ensure network stability. By leveraging the fractional programming theory and the Lyapunov optimization technique, we first propose a general algorithm framework, referred to as the eTrans, to solve the formulation. Further, we exploit the special structure of the subproblem embedded in the eTrans to develop the extremely simple and low complexity but optimal algorithms for subcarrier assignment, power allocation, and time fraction determination. In particular, all of them have closed-form solutions, and no iteration is required, which paves the way for employing the eTrans to practical applications. The theoretical analysis and simulation results exhibit that eTrans can flexibly strike a balance between EE and average delay by simply tuning an introduced control parameter.

Original languageEnglish
Pages (from-to)7488-7500
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number9
Publication statusPublished - Sept 2016


  • Delay
  • Energy efficiency (EE)
  • Heterogeneous wireless networks (HWNs)
  • Power allocation
  • Subcarrier assignment
  • Time fraction determination.

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Computer Networks and Communications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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