# Delivery Time Minimization in Edge Caching: Synergistic Benefits of Subspace Alignment and Zero Forcing

Handle URI:
http://hdl.handle.net/10754/626483
Title:
Delivery Time Minimization in Edge Caching: Synergistic Benefits of Subspace Alignment and Zero Forcing
Authors:
Kakar, Jaber; Alameer, Alaa; Chaaban, Anas ( 0000-0002-8713-5084 ) ; Sezgin, Aydin; Paulraj, Arogyaswami
Abstract:
An emerging trend of next generation communication systems is to provide network edges with additional capabilities such as additional storage resources in the form of caches to reduce file delivery latency. To investigate this aspect, we study the fundamental limits of a cache-aided wireless network consisting of one central base station, $M$ transceivers and $K$ receivers from a latency-centric perspective. We use the normalized delivery time (NDT) to capture the per-bit latency for the worst-case file request pattern at high signal-to-noise ratios (SNR), normalized with respect to a reference interference-free system with unlimited transceiver cache capabilities. For various special cases with $M=\{1,2\}$ and $K=\{1,2,3\}$ that satisfy $M+K\leq 4$, we establish the optimal tradeoff between cache storage and latency. This is facilitated through establishing a novel converse (for arbitrary $M$ and $K$) and an achievability scheme on the NDT. Our achievability scheme is a synergistic combination of multicasting, zero-forcing beamforming and interference alignment.
KAUST Department:
Communication Theory Lab
Publisher:
arXiv
Issue Date:
29-Oct-2017
ARXIV:
arXiv:1710.10654
Type:
Preprint
http://arxiv.org/abs/1710.10654v2; http://arxiv.org/pdf/1710.10654v2
Appears in Collections:
Other/General Submission; Other/General Submission; Communication Theory Lab

DC FieldValue Language
dc.contributor.authorKakar, Jaberen
dc.contributor.authorAlameer, Alaaen
dc.contributor.authorChaaban, Anasen
dc.contributor.authorSezgin, Aydinen
dc.contributor.authorPaulraj, Arogyaswamien
dc.date.accessioned2017-12-28T07:32:12Z-
dc.date.available2017-12-28T07:32:12Z-
dc.date.issued2017-10-29en
dc.identifier.urihttp://hdl.handle.net/10754/626483-
dc.description.abstractAn emerging trend of next generation communication systems is to provide network edges with additional capabilities such as additional storage resources in the form of caches to reduce file delivery latency. To investigate this aspect, we study the fundamental limits of a cache-aided wireless network consisting of one central base station, $M$ transceivers and $K$ receivers from a latency-centric perspective. We use the normalized delivery time (NDT) to capture the per-bit latency for the worst-case file request pattern at high signal-to-noise ratios (SNR), normalized with respect to a reference interference-free system with unlimited transceiver cache capabilities. For various special cases with $M=\{1,2\}$ and $K=\{1,2,3\}$ that satisfy $M+K\leq 4$, we establish the optimal tradeoff between cache storage and latency. This is facilitated through establishing a novel converse (for arbitrary $M$ and $K$) and an achievability scheme on the NDT. Our achievability scheme is a synergistic combination of multicasting, zero-forcing beamforming and interference alignment.en
dc.publisherarXiven
dc.relation.urlhttp://arxiv.org/abs/1710.10654v2en
dc.relation.urlhttp://arxiv.org/pdf/1710.10654v2en
dc.rightsArchived with thanks to arXiven
dc.titleDelivery Time Minimization in Edge Caching: Synergistic Benefits of Subspace Alignment and Zero Forcingen
dc.typePreprinten
dc.contributor.departmentCommunication Theory Laben
dc.eprint.versionPre-printen
dc.contributor.institutionInstitute of Digital Communication Systems, Ruhr-Universitat Bochum, Germanyen
dc.contributor.institutionInformation Systems Laboratory, Stanford University, CA, USAen
dc.identifier.arxividarXiv:1710.10654en
kaust.authorChaaban, Anasen