Design and analysis of traffic-based discontinuous reception operations for LTE systems

Kai-Ten Feng*, Wun Ci Su, Yu Ping Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The 3GPP long term evolution (LTE) system is developed to enhance mobile services from the former 3G systems. In order to prolong the battery life time of mobile devices, the discontinuous reception (DRX) scheme is specified in the LTE standard to reduce the power consumption of user equipment. Existing analytical models did not comprehensively consider all essential sleep mode behaviors. Therefore, a performance analysis, including major DRX parameters is proposed in this paper for sleep mode operation. The correctness of proposed model is validated and the improvement can be observed via simulations. Furthermore, according to proposed analytical model, the DRX parameters can significantly influence the power-saving efficiency and quality-of-service (QoS) of LTE system. Hence, a traffic-based DRX cycles adjustment (TDCA) scheme is proposed to adaptively adjust the sleep cycles to balance the sleep ratio and mean packet delay based on traffic estimation. A partially observable Markov decision process is employed to conjecture the present traffic status. The policy for selecting DRX parameters can be constructed-based the evaluation metrics in TDCA scheme. Simulation results show that the proposed TDCA scheme can enhance the energy-saving efficiency while the QoS constraint is still satisfied.

Original languageEnglish
Pages (from-to)8235-8249
Number of pages15
JournalIEEE Transactions on Wireless Communications
Volume16
Issue number12
DOIs
StatePublished - 1 Dec 2017

Keywords

  • 3GPP long term evolution (LTE)
  • Discontinuous reception (DRX)
  • Partially observable Markov decision process (POMDP)
  • Performance analysis
  • Power-saving

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