Power savings from half-duplex relaying in downlink cellular systems

Authors:
Chandrasekharan Raman;Gerard J. Foschini;Reinaldo A. Valenzuela;Roy D. Yates;Narayan B. Mandayam
Affiliations:
WINLAB Rutgers University, North Brunswick, NJ;Wireless Communications Research Department, Bell Labs, Alcatel-Lucent, Holmdel, NJ;Wireless Communications Research Department, Bell Labs, Alcatel-Lucent, Holmdel, NJ;WINLAB Rutgers University, North Brunswick, NJ;WINLAB Rutgers University, North Brunswick, NJ
Venue:
Allerton'09 Proceedings of the 47th annual Allerton conference on Communication, control, and computing
Year:
2009

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Abstract

We evaluate the peak and average power savings due to relay deployments in cellular systems via a simulation study. The peak power savings translate to cost reduction in power amplifiers. The average power savings lead to savings in electricity bills. Half-duplex relays are placed one per sector in a 19-cell, 57-sector cellular network. In the baseline case, the base stations control their transmit powers to achieve a common rate among users. When relays are present in the system, optimal powers are found when the relays get the complete message to be relayed to the user. The codebooks at the relays are chosen such that the users obtain a rate corresponding to the sum of the received powers from the base station and the relay. We observe that when power control is employed, the peak power saving is 2.6 dB and the average total power in the system can be reduced by 3 dB.