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We consider a geographically constrained caching community where popular data files are cached on mobile terminals and distributed through Device-to-Device (D2D) communications. To ensure availability, data files are protected against user mobility, or churn, with select caching and erasure coding methods. Communication and storage costs are considered, with an objective of minimizing the consumption of radio resources, given an available storage size. We focus on finding the coding method that minimizes the overall cost. Closed-form expressions for the expected consumption of radio resources incurred by data delivery and redundancy maintenance are derived. Closed form transmission costs in a circular caching community with a specific node density and caching method are calculated, when cost obeys a power law of distance. Our results are illustrated by numerical examples and verified by extensive computer simulations.
|Pages (from-to)||264 - 275|
|Number of pages||12|
|Journal||IEEE Transactions on Mobile Computing|
|Early online date||2018|
|Publication status||Published - 1 Feb 2019|
|MoE publication type||A1 Journal article-refereed|
- Device-to-Device Communications
- Distributed Data Storage
- Markov Processes
- Regenerating Codes
- Wireless Caching
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- 5 Finished
Pääkkönen, J., Boyd, C., Zhou, L., Singh, B., Tirkkonen, O., Ermolova, N., Ahmed, F. & Deng, J.
01/02/2015 → 31/12/2017
Project: Academy of Finland: Other research funding