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While the cost of the access network could be considerably reduced by the useof caching, this is not currently happening because content providers (CPs),who alone have the detailed demand data required for optimal content placement,have no natural incentive to use them to minimize access network operator (ANO)expenditure. We argue that ANOs should therefore provide such an incentive inthe form of direct subsidies paid to the CPs in proportion to the realizedsavings. We apply coalition game theory to design the required subsidyframework and propose a distributed algorithm, based on Lagrangiandecomposition, allowing ANOs and CPs to collectively realize the optimal memoryfor bandwidth tradeoff. The considered access network is a cache hierarchy withper-CP central office caches, accessed by all ANOs, at the apex, and per-ANOdedicated bandwidth and storage resources at the lower levels, includingwireless base stations, that must be shared by multiple CPs.

Cache Subsidies for an Optimal Memory for Bandwidth Tradeoff in the Access Network