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access icon free Joint design of device to device caching strategy and incentive scheme in mobile edge networks

© The Institution of Engineering and Technology
Received 07/09/2017, Accepted 28/04/2018, Revised 18/04/2018, Published 02/05/2018

Caching at the user devices is a key technology to alleviate backhaul load and improve users' quality of experience in mobile edge networks. However, due to the concern of privacy and limited battery life, users are not willing to share their resources. In this study, the authors jointly design the caching strategy and incentive scheme to encourage the users to share their storage resources and improve the social welfare of the cellular network. First, the user equipments (UEs) are classified into different types according to their preference to share cache resources. Then, based on contract theory, an optimisation problem with necessary constraints is formulated aiming at maximising the base station (BS)'s utility. The reward the BS pays for a UE is based on the total amount of contents it shares with other UEs, which is related to the caching policy of UEs. A heuristic caching strategy is proposed and the optimal contract is obtained. Finally, the system performance of the proposed solution is analysed, simulation results show that the incentive scheme can improve the willingness of users to share contents, and the proposed caching strategy contributes more to the social welfare compared with two baseline caching schemes: fair caching and random caching.

Inspec keywords: quality of experience; data privacy; telecommunication security; mobile computing; cellular radio; optimisation

Other keywords: heuristic caching strategy; incentive scheme; UE caching policy; cellular network; user equipments; storage resources; device-to-device caching strategy; quality-of-experience; optimisation problem; contract theory; base station utility maximisation; cache resource sharing; mobile edge networks; backhaul load; social welfare

Subjects: Mobile radio systems; Optimisation techniques

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