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Cache-Enabled Heterogeneous Cellular Networks: Optimal Tier-Level Content Placement | | Juan Wen
; Kaibin Huang
; Sheng Yang
; Victor O. K. Li
; | | Date: |
16 Dec 2016 | | Abstract: | Caching popular contents at BSs of a HCN reduces latency and alleviates
traffic congestion in backhaul links. Due to the complexity of
network-performance analysis, the optimal strategies for content placement in
HCNs remain largely unknown. To this end, we adopt the popular random HCN model
where $K$ tiers of BS are modelled as independent PPPs. Further, the random
caching scheme is considered. We consider the network-performance metric, hit
probability, defined as the probability that a file requested by the typical
user is delivered successfully to the user. Leveraging existing results on HCN
performance, we maximize the hit probability over content placement
probabilities, which yields the optimal placement policies. For the case of
uniform received signal-to-interference thresholds, the policy is in
closed-form where the placement probability for a particular file is
proportional to the square-root of the corresponding popularity measure with an
offset depending on BS caching capacities. For the general case of non-uniform
SIR threshold, the optimization problem is non-convex and a sub-optimal
placement policy is designed by approximation, which is shown by simulation to
be close-to-optimal. | | Source: | arXiv, 1612.5506 | | Services: | Forum | Review | PDF | Favorites | |
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