Graduate School and Research Center in Digital Sciences

Coded caching with optimized shared-cache sizes

Parrinello, Emanuele; Elia, Petros

ITW 2019, IEEE Information Theory Workshop, 25-28 August 2019, Visby, Gotland, Sweden

This work studies the K-user broadcast channel where each user is assisted by one of Λ caches with a cumulative memory constraint that is equal to t times the size of the library, and where each cache serves an arbitrary number of users. In this setting, under the assumption of uncoded cache placement, no prior scheme is known to achieve a sum degrees of freedom (DoF) of t+1, other than in the uniform case where all caches serve an equal number of users. We here show for the first time that allowing an optimized memory allocation across the caches as a function of the number of users served per cache, provides for the aforementioned DoF. A subsequent index-coding based converse proves that this performance can be close to optimal for bounded values of t.

Document Doi Bibtex

Title:Coded caching with optimized shared-cache sizes
Type:Conference
Language:English
City:Visby
Country:SWEDEN
Date:
Department:Communication systems
Eurecom ref:6114
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Bibtex: @inproceedings{EURECOM+6114, doi = {http://dx.doi.org/10.1109/ITW44776.2019.8989173}, year = {2019}, title = {{C}oded caching with optimized shared-cache sizes}, author = {{P}arrinello, {E}manuele and {E}lia, {P}etros}, booktitle = {{ITW} 2019, {IEEE} {I}nformation {T}heory {W}orkshop, 25-28 {A}ugust 2019, {V}isby, {G}otland, {S}weden }, address = {{V}isby, {SWEDEN}}, month = {08}, url = {http://www.eurecom.fr/publication/6114} }
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