Cellular Traffic Offloading with Optimized Compound Single-point Unicast and Cache-based Multipoint Multicast

Abstract

We consider an optimal cache-placement-anddelivery-policy where traffic is offloaded from Single-Point Unicast (SPUC) service by using network-level Orthogonal Multipoint Multicast (OMPMC) scheme. The files are classified into two sets. The most popular files are cached at the BSs using a probabilistic approach and are served by OMPMC. The remaining files are fetched from the core network on demand and served by SPUC. Optimal compound scheme is analyzed, based on resource allocation between OMPMC and multi-antenna SPUC schemes. If a user is not able to successfully receive the requested file due to its experienced signal-to-interference-plusnoise ratio, its request is in outage. A closed-form expression is derived for the total outage probability based on stochastic geometry for the compound scheme. An optimization problem is formulated to design the caching policy for the compound scheme. The optimal solution to this problem is obtained by finding optimal cache placement, bandwidth allocation, and file classification. Simulation results show that the compound scheme outperforms other caching schemes in terms of the total outage probability.

Optimal Bandwidth Allocation for Multicast-Cache-Aided on-Demand Streaming in Wireless Networks

“…We exploit this to develop a hybrid scheme based on OMPMC that streams the files using a network-wide file-specific resource allocation, and on-demand SPUC that unicasts the files using UE-specific resource-allocations. In contrast to [10], [16], we devise the hybrid scheme such that all UEs being dissatisfied by the multicast component can be properly served by the network. We optimize the network w.r.t.…”