A Scalable Scheme for Joint Routing and Resource Allocation in LTE-D2D Based Offloading

Abstract

In this paper, we address the optimal design of scalable offloading schemes based on the LTE-D2D standard to offload intracellular traffic, unicast and multicast, over multihop D2D networks of cooperative User-Equipments. Specifically, we deal with the problem of joint routing and OFDMA resource allocation that underlies such schemes. Considering crowded-platform use-cases, we propose a novel path-based ILP formulation in which a routing tree is formulated in terms of its constituent paths. Moreover, to boost scalability, we propose a sub-optimal solution method, named JRW-D2D-CG, based on the column-generation framework with a pricing problem. Based on extensive network simulation in NS-3 environment, we demonstrate that our proposal achieves good performances in terms of reliability, latency, and scalability.