Optimal cross-layer power allocation with channel and queue state information

Wei Chen, Zhi Gang Cao, Ping Yi Fan, Khaled Letaief

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1 Citation (Scopus)


The optimal power allocation was investigated when both channel and queue state information was taken into account. By modeling the system from a cross-layer perspective, an optimization problem was formulated on power allocation where the maximal power requirement of a user was determined by the number of its backlog packets. The analytical solution as well as its algorithm, which refer to as water filling in cellar (WFIC), were proposed. The proposed WFIC can be reduced to traditional water-filling (TWF) method as a special case where queue state was ignored. Simulation results show that the proposed method can achieve lower queuing delay compared to conventional methods.

Original languageEnglish
Pages (from-to)16-23
Number of pages8
JournalTongxin Xuebao/Journal on Communications
Issue number8
Publication statusPublished - Aug 2007
Externally publishedYes



  • Cross-layer
  • Network information theory
  • Power allocation
  • Wireless networks

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Information Systems

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