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 language | English |
|---|---|
| Journal | IEEE Transactions on Wireless Communications |
| DOIs | |
| Publication status | Accepted/In press - 22 Jun 2018 |
| Externally published | Yes |
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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 journal › Article
}
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 -