Abstract
This paper studies the optimal probabilistic caching placement in large-scale cache-enabled D2D networks to maximize the cache hit performance, which is defined as the probability that a random user request can be served by mobile helpers (MHs) in the vicinity. To avoid collisions of the concurrent transmissions, a contention based multimedia delivery protocol is proposed, under which a MH is allowed to transmit only if its back-off timer is the smallest among its associated contenders. By applying tools from stochastic geometry, the optimal caching probability is derived and analyzed. It is shown that the optimal solution of the probabilistic caching placement depends on the density of MHs, the D2D communication range, and the user request distribution. With the derived optimal caching probabilities, we further characterize the transmission probability of MHs and thereby the successful content delivery probability of the cache-enabled D2D network. Simulations are provided to validate our analysis.
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Notes
- 1.
For two eligible MHs located at x and y, we say y is a contender of x with contention threshold \( N_{d} \,{\text{if}}\,P_{d} h|{\mathbf{y}} - {\mathbf{x}}|^{ - \alpha } \ge N_{d} . \)
- 2.
A point process \( \mathcal{N} \) is isotropic if its characteristics are invariant under rotation [24].
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Acknowledgements
This work was supported in part by Fundamental Research Funds for the Central Universities under Grant No. N150403001, the National Natural Science Foundation of China under Grant 61671141, U14331156, 1151002, 61401079, 61501038, and the Major Research Plan of the National Natural Science Foundation of China under Grant 91438117,91538202.
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Song, X., Geng, Y., Meng, X., Ye, N., Liu, J., Lei, W. (2018). Probabilistic Caching in Wireless Device to Device Networks with Contention Based Multimedia Delivery. In: Long, K., Leung, V., Zhang, H., Feng, Z., Li, Y., Zhang, Z. (eds) 5G for Future Wireless Networks. 5GWN 2017. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 211. Springer, Cham. https://doi.org/10.1007/978-3-319-72823-0_41
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