Transmit Power Control Policies for Energy Harvesting Sensors With Retransmissions

Aprem, Anup and Murthy, Chandra R and Mehta, Neelesh B (2013) Transmit Power Control Policies for Energy Harvesting Sensors With Retransmissions. In: IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING, 7 (5). pp. 895-906.

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Abstract

This paper addresses the problem of finding outage-optimal power control policies for wireless energy harvesting sensor (EHS) nodes with automatic repeat request (ARQ)-based packet transmissions. The power control policy of the EHS specifies the transmission power for each packet transmission attempt, based on all the information available at the EHS. In particular, the acknowledgement (ACK) or negative acknowledgement (NACK) messages received provide the EHS with partial information about the channel state. We solve the problem of finding an optimal power control policy by casting it as a partially observable Markov decision process (POMDP). We study the structure of the optimal power policy in two ways. First, for the special case of binary power levels at the EHS, we show that the optimal policy for the underlying Markov decision process (MDP) when the channel state is observable is a threshold policy in the battery state. Second, we benchmark the performance of the EHS by rigorously analyzing the outage probability of a general fixed-power transmission scheme, where the EHS uses a predetermined power level at each slot within the frame. Monte Carlo simulation results illustrate the performance of the POMDP approach and verify the accuracy of the analysis. They also show that the POMDP solutions can significantly outperform conventional ad hoc approaches.

Item Type:	Journal Article
Publication:	IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright for this article belongs to IEEE Xplore
Keywords:	Energy harvesting sensors; power control; ARQ; retransmission; POMDP
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	25 Oct 2013 06:58
Last Modified:	25 Oct 2013 07:07
URI:	http://eprints.iisc.ac.in/id/eprint/47568

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