Graduate School and Research Center in Digital Sciences

Optimal cache allocation for Femto helpers with joint transmission capabilities

Tuholukova, Alina; Neglia, Giovanni; Spyropoulos, Thrasyvoulos

ICC 2017, IEEE International Conference on Communications, Communications QoS, Reliability, and Modeling Symposium, 21-25 May 2017, Paris, France

As cellular network operators are struggling to keep up with the rapidly increasing traffic demand, two key directions are deemed necessary for beyond 4G networks: (i) extensive cell densification to improve spatial reuse, and (ii) storage of content as close to the user as possible to cope with the backhaul constraints and increased interference. However, caching has mostly been studied with an exclusive focus either on the backhaul network (e.g. the "femto-caching" line of work) or on the radio access (e.g. through coded caching or cacheaided CoMP). As a result, an understanding of the impact of edge caching on network-wide and end-to-end performance is lacking. In this paper we investigate the problem of optimal caching in a context where nearby small cells ("femto-helpers") can coordinate not just in terms of what to cache but also to perform Joint Transmission (a type of CoMP). We show that interesting tradeoffs arise between caching policies that improve radio access and ones that improve backhaul, and propose an algorithm that provably achieves an 1/2-approximation ratio to the optimal one (which is NP-hard), and performs well in simulated scenarios.

Document Doi Hal Bibtex

Title:Optimal cache allocation for Femto helpers with joint transmission capabilities
Keywords:caching, joint transmission, CoMP, heterogeneous cellular networks
Department:Communication systems
Eurecom ref:5219
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Bibtex: @inproceedings{EURECOM+5219, doi = {}, year = {2017}, title = {{O}ptimal cache allocation for {F}emto helpers with joint transmission capabilities }, author = {{T}uholukova, {A}lina and {N}eglia, {G}iovanni and {S}pyropoulos, {T}hrasyvoulos}, booktitle = {{ICC} 2017, {IEEE} {I}nternational {C}onference on {C}ommunications, {C}ommunications {Q}o{S}, {R}eliability, and {M}odeling {S}ymposium, 21-25 {M}ay 2017, {P}aris, {F}rance}, address = {{P}aris, {FRANCE}}, month = {05}, url = {} }
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