A Dynamic Mobile Terminal Sleep Mode Operation Scheme Considering Packet Queue Length

Hongkui SHI  Mengtian RONG  Ping LI  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.9   pp.2464-2471
Publication Date: 2007/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.9.2464
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
sleep mode operation,  discontinuous reception (DRX),  power saving,  next generation mobile telecommunications system,  3G-LTE,  

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Due to the discontinuity of packet based traffic, the user terminals in next generation mobile telecommunications systems will be equipped with sleep mode operation functions for power saving purpose. The sleep mode parameters should be appropriately configured so that power consumption can be sufficiently decreased while packet queue length and packet delay are restricted within a demanded level. This paper proposes an adaptive sleep mode parameter configuration scheme which is able to jointly optimize the inactivity timer and sleep period in response to the variation of user traffic arrival pattern. The optimization target of this scheme is to minimize mobile terminal power consumption while ensuring that the mean downlink packet queue length do not exceed a certain threshold. Results of computer simulations prove that, the presented approach perfectly manages packet queue length restriction, packet delay control and power saving in a wide range of user packet inter-arrival rates both in single- and dual-service scenarios.