Benefits of Cache Assignment on Degraded Broadcast Channels

Degraded K-user broadcast channels (BCs) are studied when the receivers are facilitated with cache memories. Lower and upper bounds are derived on the capacity-memory tradeoff, i.e., on the largest rate of reliable communication over the BC as a function of the receivers' cache sizes, and the b...

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Published in:	IEEE transactions on information theory Vol. 65; no. 11; pp. 6999 - 7019
Main Authors:	Saeedi Bidokhti, Shirin, Wigger, Michele, Yener, Aylin
Format:	Journal Article
Language:	English
Published:	New York IEEE 01.11.2019 The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Institute of Electrical and Electronics Engineers
Subjects:	Broadcast channel (BC) Budgets Cache memory Caching capacity-memory tradeoff Channel coding Channels Computer Science Decoding Gaussian channels Information Theory joint source-channel coding Lower bounds Noise measurement Optimization Receivers Servers Tradeoffs Upper bound Upper bounds Index Terms-Broadcast channel (BC) joint source-channel coding caching Gaussian channels capacity- memory tradeoff
ISSN:	0018-9448, 1557-9654
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Abstract	Degraded K-user broadcast channels (BCs) are studied when the receivers are facilitated with cache memories. Lower and upper bounds are derived on the capacity-memory tradeoff, i.e., on the largest rate of reliable communication over the BC as a function of the receivers' cache sizes, and the bounds are shown to match for interesting special cases. The lower bounds are achieved by two new coding schemes that benefit from nonuniform cache assignments. Lower and upper bounds are also established on the global capacity-memory tradeoff, i.e., on the largest capacity-memory tradeoff that can be attained by optimizing the receivers' cache sizes subject to a total cache memory budget. The bounds coincide when the total cache memory budget is sufficiently small or sufficiently large, where the thresholds depend on the BC statistics. For small cache memories, it is optimal to assign all the cache memory to the weakest receiver. In this regime, the global capacity-memory tradeoff grows by the total cache memory budget divided by the number of files in the system. In other words, a perfect global caching gain is achievable in this regime and the performance corresponds to a system where all the cache contents in the network are available to all receivers. For large cache memories, it is optimal to assign a positive cache memory to every receiver, such that the weaker receivers are assigned larger cache memories compared to the stronger receivers. In this regime, the growth rate of the global capacity-memory tradeoff is further divided by the number of users, which corresponds to a local caching gain. It is observed numerically that a uniform assignment of the total cache memory is suboptimal in all regimes, unless the BC is completely symmetric. For erasure BCs, this claim is proved analytically in the regime of small cache sizes.
AbstractList	Degraded K-user broadcast channels (BCs) are studied when the receivers are facilitated with cache memories. Lower and upper bounds are derived on the capacity-memory tradeoff, i.e., on the largest rate of reliable communication over the BC as a function of the receivers’ cache sizes, and the bounds are shown to match for interesting special cases. The lower bounds are achieved by two new coding schemes that benefit from nonuniform cache assignments . Lower and upper bounds are also established on the global capacity-memory tradeoff, i.e., on the largest capacity-memory tradeoff that can be attained by optimizing the receivers’ cache sizes subject to a total cache memory budget. The bounds coincide when the total cache memory budget is sufficiently small or sufficiently large, where the thresholds depend on the BC statistics. For small cache memories, it is optimal to assign all the cache memory to the weakest receiver. In this regime, the global capacity-memory tradeoff grows by the total cache memory budget divided by the number of files in the system. In other words, a perfect global caching gain is achievable in this regime and the performance corresponds to a system where all the cache contents in the network are available to all receivers. For large cache memories, it is optimal to assign a positive cache memory to every receiver, such that the weaker receivers are assigned larger cache memories compared to the stronger receivers. In this regime, the growth rate of the global capacity-memory tradeoff is further divided by the number of users, which corresponds to a local caching gain. It is observed numerically that a uniform assignment of the total cache memory is suboptimal in all regimes, unless the BC is completely symmetric. For erasure BCs, this claim is proved analytically in the regime of small cache sizes.
Author	Saeedi Bidokhti, Shirin Wigger, Michele Yener, Aylin
Author_xml	– sequence: 1 givenname: Shirin orcidid: 0000-0002-3790-202X surname: Saeedi Bidokhti fullname: Saeedi Bidokhti, Shirin email: saeedi@seas.upenn.edu organization: Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA – sequence: 2 givenname: Michele orcidid: 0000-0002-6737-5427 surname: Wigger fullname: Wigger, Michele email: michele.wigger@telecom-paristech.fr organization: LTCI, Télécom Paris, IP Paris, Paris, France – sequence: 3 givenname: Aylin orcidid: 0000-0003-0820-3390 surname: Yener fullname: Yener, Aylin email: yener@engr.psu.edu organization: Department of Electrical Engineering, School of Electrical Engineering and Computer Science, Pennsylvania State University, State College, PA, USA
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SubjectTerms	Broadcast channel (BC) Budgets Cache memory Caching capacity-memory tradeoff Channel coding Channels Computer Science Decoding Gaussian channels Information Theory joint source-channel coding Lower bounds Noise measurement Optimization Receivers Servers Tradeoffs Upper bound Upper bounds
Title	Benefits of Cache Assignment on Degraded Broadcast Channels
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