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Open AccessArticle

Cooperative Smartphone Relay Selection Based on Fair Power Utilization for Network Coverage Extension

Department of Electrical and Electronic Engineering, University of London, London EC1V 0HB, UK
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Information 2019, 10(12), 381; https://doi.org/10.3390/info10120381
Received: 15 October 2019 / Revised: 8 November 2019 / Accepted: 28 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Emerging Topics in Wireless Communications for Future Smart Cities)
This paper presents a relay selection algorithm based on fair battery power utilization for extending mobile network coverage and capacity by using a cooperative communication strategy where mobile devices can be utilized as relays. Cooperation improves the network performance for mobile terminals, either by providing access to out-of-range devices or by facilitating multi-path network access to connected devices. In this work, we assume that all mobile devices can benefit from using other mobile devices as relays and investigate the fairness of relay selection algorithms. We point out that signal strength based relay selection inevitably leads to unfair relay selection and devise a new algorithm that is based on fair utilization of power resources on mobile devices. We call this algorithm Credit based Fair Relay Selection (CF-RS) and in this paper show through simulation that the algorithm results in fair battery power utilization, while providing similar data rates compared with traditional approaches. We then extend the solution to demonstrate that adding incentives for relay operation adds clear value for mobile devices in the case they require relay service. Typically, mobile devices represent self-interested users who are reluctant to cooperate with other network users, mainly due to the cost in terms of power and network capacity. In this paper, we present an incentive based solution which provides clear mutual benefit for mobile devices and demonstrate this benefit in the simulation of symmetric and asymmetric network topologies. The CF-RS algorithm achieves the same performance in terms of achievable data rate, Jain’s fairness index and utility of end devices in both symmetric and asymmetric network configurations.
Keywords: relay selection algorithm; fair battery power utilization; self-interested users; asymmetric network topology; cooperative communication relay selection algorithm; fair battery power utilization; self-interested users; asymmetric network topology; cooperative communication
MDPI and ACS Style

Ayub, N.; Rakocevic, V. Cooperative Smartphone Relay Selection Based on Fair Power Utilization for Network Coverage Extension. Information 2019, 10, 381.

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