An Adaptive Power Saving Scheme in OFDMA-TDD-Based Cellular Relay Networks

Se-Jin KIM  Byung-Bog LEE  You-Chang KO  Seungwan RYU  Hyong-Woo LEE  Choong-Ho CHO  

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.6    pp.1657-1660
Publication Date: 2010/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1657
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
cellular relay network,  power saving,  OFDMA,  

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We present an adaptive power saving (APS) scheme to reduce downlink energy consumption of the transmit power in the cellular relay network (CRN). In the APS scheme, some cell topologies operating in 2-hop mode using relay stations (RSs) are converted to that of 3-hop mode and others are simultaneously converted to that of single-hop mode when the offered traffic load becomes very low, especially during night periods. By this means, we show the APS scheme outperforms the conventional CRN (CCRN) scheme in terms of energy consumption.