Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 66, Issue 11, Pages 5415-5429Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2018.2846633
Keywords
Caching policy; heterogeneous networks; cache and buffer; bandwidth allocation
Funding
- Engineering and Physical Science Research Council [EP/P003486/1, EP/N029666/1, EP/N029720/1]
- National Nature Science Foundation of China [61471114, 61372106, 61701198]
- Six Talent Peaks project in Jiangsu Province [GDZB-005]
- EPSRC [EP/P022723/1, EP/N029666/1] Funding Source: UKRI
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In this paper, we aim to minimize the average file transmission delay via bandwidth allocation and cache placement in two-tier heterogeneous networks with limited storage capacity, which consists of cache capacity and buffer capacity. For average delay minimization problem with fixed bandwidth allocation, although this problem is nonconvex, the optimal solution is obtained in closed form by comparing all locally optimal solutions calculated from solving the Karush-Kuhn-Tucker conditions. To jointly optimize bandwidth allocation and cache placement, the optimal bandwidth allocation is first derived and then substituted into the original problem. The structure of the optimal caching strategy is presented, which shows that it is optimal to cache the files with high popularity instead of the files with big size. Based on this optimal structure, we propose an iterative algorithm with low complexity to obtain a suboptimal solution, where the closed-from expression is obtained in each step. Numerical results show the superiority of our solution compared with the conventional cache strategy without considering cache and buffer tradeoff in terms of delay.
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