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RISS 인기검색어
- 검색키워드
- 저자 : Nicola Marchetti (검색결과 2 건)
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Inter-Cluster Cooperation for Wireless D2D Caching Networks
Amer, Ramy,Butt, M. Majid,Bennis, Mehdi,Marchetti, Nicola IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.9
<P>Proactive wireless caching and device to device (D2D) communication have emerged as promising techniques for enhancing users’ quality of service and network performance. In this paper, we propose a new architecture for D2D caching with inter-cluster cooperation. We study a cellular network in which users cache popular files and share them with other users either in their proximity via D2D communication or with remote users using cellular transmission. We characterize the network average delay per request from a queuing perspective. Specifically, we formulate the delay minimization problem and show that it is NP-hard. Furthermore, we prove that the delay minimization problem is equivalent to the minimization of a non-increasing monotone supermodular function subject to a uniform partition matroid constraint. A computationally efficient greedy algorithm is proposed which is proven to be locally optimal within a factor <TEX>$(1 - e^{-1})\approx 0.63$</TEX> of the optimum. We analyze the average per request throughput for different caching schemes and conduct the scaling analysis for the average sum throughput. We show how throughput scaling depends on video content popularity when the number of files grows asymptotically large. Simulation results show a delay reduction of 45% to 80% compared to a D2D caching system without inter-cluster cooperation.</P>
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Optimizing Joint Probabilistic Caching and Channel Access for Clustered D2D Networks
Ramy Amer,Mohamed Baza,Tara Salman,M. Majid Butt,Ahmad Alhindi,Nicola Marchetti 한국통신학회 2021 Journal of communications and networks Vol.23 No.6
Caching at mobile devices and leveraging deviceto-device (D2D) communication are two promising approachesto support massive content delivery over wireless networks. Analysis of such D2D caching networks based on a physicalinterference model is usually carried out by assuming uniformlydistributed devices. However, this approach does not capture thenotion of device clustering. In this regard, this paper proposesa joint communication and caching optimization framework forclustered D2D networks. Devices are spatially distributed intodisjoint clusters and are assumed to have a surplus memorythat is utilized to proactively cache files, following a randomprobabilistic caching scheme. The cache offloading gain is maximizedby jointly optimizing channel access and caching scheme. A closed-form caching solution is obtained and bisection searchmethod is adopted to heuristically obtain the optimal channelaccess probability. Results show significant improvement in theoffloading gain reaching up to 10% compared to the Zipf cachingbaseline.
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