Exploiting Mobility in Cache-Assisted D2D Networks

Performance Analysis and Optimization

Rui Wang, Jun Zhang, S. H. Song, Khaled Letaief

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Caching popular content at mobile devices, accompanied by device-to-device (D2D) communications, is one promising technology for effective mobile content delivery. User mobility is an important factor when investigating such networks, which unfortunately was largely ignored in most previous works. Preliminary studies have been carried out, but the effect of mobility on the caching performance has not been fully understood. In this paper, by explicitly considering users’ contact and inter-contact durations via an alternating renewal process, we first investigate the effect of mobility with a given cache placement. A tractable expression of the data offloading ratio, i.e., the proportion of requested data that can be delivered via D2D links, is derived, which is proved to be increasing with the user moving speed. The analytical results are then used to develop an effective mobility-aware caching strategy to maximize the data offloading ratio. Simulation results are provided to confirm the accuracy of the analytical results and also validate the effect of user mobility. Performance gains of the proposed mobility-aware caching strategy are demonstrated with both stochastic models and real-life data sets. It is observed that the information of the contact durations is critical to design cache placement, especially when they are relatively short or comparable to the inter-contact durations.

Original languageEnglish
JournalIEEE Transactions on Wireless Communications
DOIs
Publication statusAccepted/In press - 22 Jun 2018
Externally publishedYes

Fingerprint

Network Optimization
Performance Optimization
Network Analysis
Network Performance
Stochastic models
Network performance
Mobile devices
Cache
Performance Analysis
Caching
Communication
Contact
Placement
Alternating Renewal Process
Mobile Devices
Stochastic Model
Proportion
Maximise
Simulation

Keywords

  • Device-to-device communication
  • device-to-device communications
  • human mobility
  • Indexes
  • Libraries
  • Performance evaluation
  • renewal process
  • Simulation
  • Stochastic processes
  • Wireless caching
  • Wireless communication

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Cite this

Exploiting Mobility in Cache-Assisted D2D Networks : Performance Analysis and Optimization. / Wang, Rui; Zhang, Jun; Song, S. H.; Letaief, Khaled.

In: IEEE Transactions on Wireless Communications, 22.06.2018.

Research output: Contribution to journalArticle

@article{01c4967f77aa4104aca27c4f5569d9be,
title = "Exploiting Mobility in Cache-Assisted D2D Networks: Performance Analysis and Optimization",
abstract = "Caching popular content at mobile devices, accompanied by device-to-device (D2D) communications, is one promising technology for effective mobile content delivery. User mobility is an important factor when investigating such networks, which unfortunately was largely ignored in most previous works. Preliminary studies have been carried out, but the effect of mobility on the caching performance has not been fully understood. In this paper, by explicitly considering users’ contact and inter-contact durations via an alternating renewal process, we first investigate the effect of mobility with a given cache placement. A tractable expression of the data offloading ratio, i.e., the proportion of requested data that can be delivered via D2D links, is derived, which is proved to be increasing with the user moving speed. The analytical results are then used to develop an effective mobility-aware caching strategy to maximize the data offloading ratio. Simulation results are provided to confirm the accuracy of the analytical results and also validate the effect of user mobility. Performance gains of the proposed mobility-aware caching strategy are demonstrated with both stochastic models and real-life data sets. It is observed that the information of the contact durations is critical to design cache placement, especially when they are relatively short or comparable to the inter-contact durations.",
keywords = "Device-to-device communication, device-to-device communications, human mobility, Indexes, Libraries, Performance evaluation, renewal process, Simulation, Stochastic processes, Wireless caching, Wireless communication",
author = "Rui Wang and Jun Zhang and Song, {S. H.} and Khaled Letaief",
year = "2018",
month = "6",
day = "22",
doi = "10.1109/TWC.2018.2847649",
language = "English",
journal = "IEEE Transactions on Wireless Communications",
issn = "1536-1276",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Exploiting Mobility in Cache-Assisted D2D Networks

T2 - Performance Analysis and Optimization

AU - Wang, Rui

AU - Zhang, Jun

AU - Song, S. H.

AU - Letaief, Khaled

PY - 2018/6/22

Y1 - 2018/6/22

N2 - Caching popular content at mobile devices, accompanied by device-to-device (D2D) communications, is one promising technology for effective mobile content delivery. User mobility is an important factor when investigating such networks, which unfortunately was largely ignored in most previous works. Preliminary studies have been carried out, but the effect of mobility on the caching performance has not been fully understood. In this paper, by explicitly considering users’ contact and inter-contact durations via an alternating renewal process, we first investigate the effect of mobility with a given cache placement. A tractable expression of the data offloading ratio, i.e., the proportion of requested data that can be delivered via D2D links, is derived, which is proved to be increasing with the user moving speed. The analytical results are then used to develop an effective mobility-aware caching strategy to maximize the data offloading ratio. Simulation results are provided to confirm the accuracy of the analytical results and also validate the effect of user mobility. Performance gains of the proposed mobility-aware caching strategy are demonstrated with both stochastic models and real-life data sets. It is observed that the information of the contact durations is critical to design cache placement, especially when they are relatively short or comparable to the inter-contact durations.

AB - Caching popular content at mobile devices, accompanied by device-to-device (D2D) communications, is one promising technology for effective mobile content delivery. User mobility is an important factor when investigating such networks, which unfortunately was largely ignored in most previous works. Preliminary studies have been carried out, but the effect of mobility on the caching performance has not been fully understood. In this paper, by explicitly considering users’ contact and inter-contact durations via an alternating renewal process, we first investigate the effect of mobility with a given cache placement. A tractable expression of the data offloading ratio, i.e., the proportion of requested data that can be delivered via D2D links, is derived, which is proved to be increasing with the user moving speed. The analytical results are then used to develop an effective mobility-aware caching strategy to maximize the data offloading ratio. Simulation results are provided to confirm the accuracy of the analytical results and also validate the effect of user mobility. Performance gains of the proposed mobility-aware caching strategy are demonstrated with both stochastic models and real-life data sets. It is observed that the information of the contact durations is critical to design cache placement, especially when they are relatively short or comparable to the inter-contact durations.

KW - Device-to-device communication

KW - device-to-device communications

KW - human mobility

KW - Indexes

KW - Libraries

KW - Performance evaluation

KW - renewal process

KW - Simulation

KW - Stochastic processes

KW - Wireless caching

KW - Wireless communication

UR - http://www.scopus.com/inward/record.url?scp=85049110069&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85049110069&partnerID=8YFLogxK

U2 - 10.1109/TWC.2018.2847649

DO - 10.1109/TWC.2018.2847649

M3 - Article

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

ER -