A social-aware content delivery scheme based on D2D communications underlying cellular networks: a Stackelberg game appr
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A social-aware content delivery scheme based on D2D communications underlying cellular networks: a Stackelberg game approach Junyue Qu1 · Dianxu Zhang1 Yueming Cai2
· Dan Wu2 · Yanshan Long3 · Wendong Yang2 · Lianxin Yang2 · Lan Yang4 ·
Received: 24 October 2018 / Accepted: 30 June 2020 / Published online: 26 November 2020 © Institut Mines- and Springer Nature Switzerland AG 2020
Abstract Content delivery based on device-to-device (D2D) communications has been widely considered an effective response to the prevalence of content sharing and local services. In order to ensure its advantages, content requesters (CRs) should decide from which content providers (CPs) they obtain the desired content. Moreover, no CP will provide contents for free; thus, an incentive should be given to motivate the CPs. In this work, we solve the content delivery utilizing a monetary incentive. In particular, each CP just transmits a part of the content to CR to reduce the energy consumption. Simultaneously, we introduce the social tie to improve the incentive efficiency, with the popularity of mobile social networks. Specifically, considering the two-layer architecture consisting of the CR and the CPs, a Stackelberg game model is introduced to model the content delivery. The CR works as the leader, and decides the monetary incentive. The CPs work as the followers, and decide the proportion of the provided content. Then, the expression of the Stackelberg equilibrium is given, and a content delivery and pricing algorithm based on the Stackelberg game is designed to converge to the Stackelberg equilibrium through finite-time iterations. Simulation results provide evidences for its efficiency. Keywords Device-to-device communication · Content delivery · Stackelberg game · Social-aware
1 Introduction With the wireless data traffic increasing dramatically, the content request is considered to be the main data traffic in the future [1]. In this context, the content caching and delivery based on device-to-device (D2D) communications is proposed to take the advantage of D2D communications and alleviate the pressure of the base station (BS) [2–5]. By constructing the D2D links, a content requester (CR) can obtain the desired contents from the content provider (CP) in close proximity directly. As a result, the content caching and delivery based on D2D communications can achieve higher data rate, higher spectrum efficiency, and less delay. Therefore, it is drawing more and more attention.
Dianxu Zhang
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Extended author information available on the last page of the article.
However, since the local storage and data transmission capabilities of mobile devices are limited, the users cannot cache all the contents. Then, it is worthwhile to consider how to selectively cache popular contents, so as to ensure high availability of cached contents [6, 7]. Note that the precise placement of cached contents cannot maximize the advantages of D2D content sharing. The reasons for this are twofold. Firstly, due to the varied content popularit
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