On the improvement of scaling laws for wireless ad hoc networks with physical layer caching

In this paper, we propose a physical layer (PHY) caching scheme to exploit cache-assisted dynamic multihopping gain and cache-induced opportunistic CoMP gain in wireless ad hoc networks. In particular, the PHY caching scheme contains a novel PHY transmission mode called the cache-induced dual-layer CoMP which can support homogeneous opportunistic CoMP in wireless adhoc networks and substantially improves the throughput. Compared with traditional per-node throughput scaling results of Θ (1/√N), we can achieve O(1) per node throughput for a cached wireless ad hoc network with N nodes. Moreover, we study the impact of various system parameters on the PHY caching gain. Simulations also verified that the proposed PHY caching achieves significant gains over existing wireless caching schemes.