NDLI: Network-coded caching-aided multicast for efficient content delivery

Content Provider	IEEE Xplore Digital Library
Author	Llorca, J. Tulino, A.M. Guan, K. Kilper, D.C.
Copyright Year	2013
Description	Author affiliation: Bell Labs., Alcatel-Lucent, Holmdel, NJ, USA (Llorca, J.; Tulino, A.M.; Guan, K.; Kilper, D.C.)
Abstract	Consider a content delivery network in which storage and transport resources, characterized by their capacity and cost (e.g., energy) efficiency, are used to meet users' content object requests. The goal is to find the evolution of the objects being stored and transported by the network resources that meets user requests, satisfies network resource capacities and minimizes overall network cost. We first present a constructive offline solution that provides the maximum network efficiency (or minimum cost per object delivered) that can be achieved by dynamically exploiting network-coded caching and multicasting under arbitrary time-varying demands. We refer to the solution scheme as a dynamic network-coded caching-aided multicast (NCCAM) scheme, and illustrate it in a 6-node butterfly network. We then consider a single time period in which each user requests an arbitrary subset of content objects. We formulate the problem as a network coding problem on a caching-augmented graph and show that under uniform demand, random linear coded caching and multicasting is sufficient for achieving minimum cost caching-aided multicast. For the arbitrary demand scenario, we provide the transport-storage-popularity tradeoff of a polynomial-time solution that uses uncoded caching according to object popularity and random linear coded transmission. We show that while for skewed Zipf object popularity such a simple scheme achieves close to optimal performance, as the Zipf parameter approaches zero (uniform popularity), significant cost reductions can be obtained by optimizing the transport configuration at the expense of increased computational complexity.
Starting Page	3557
Ending Page	3562
File Size	306597
Page Count	6
File Format	PDF
ISBN	9781467331227
ISSN	15503607
DOI	10.1109/ICC.2013.6655103
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-09
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Network coding Multicast communication IP networks Vectors Linear codes Content distribution networks network coding Energy efficiency content distribution information centric networking multicast in-network caching
Content Type	Text
Resource Type	Article

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