Optimal Cache Leasing from a Mobile Network Operator to a Content Provider

Jonatan Krolikowski (1) , Anastasios Giovanidis (2) , Marco Di Renzo (1)

1 L2S - Laboratoire des signaux et systèmes
2 NPA - Networks and Performance Analysis

Caching popular content at the wireless edge is recently proposed as a means to reduce congestion at the backbone of cellular networks. The two main actors involved are Mobile Network Operators (MNOs) and Content Providers (CPs). In this work, we consider the following arrangement: an MNO pre-installs memory on its wireless equipment (e.g. Base Stations) and invites a unique CP to use them, with monetary cost. The CP will lease memory space and place its content; the MNO will associate network users to stations. For a given association policy, the MNO may help (or not) the CP to offload traffic, depending on whether the association takes into account content placement. We formulate an optimization problem from the CP perspective, which aims at maximizing traffic offloading with minimum leasing costs. This is a joint optimization problem that can include any association policy, and can also derive the optimal one. We present a general exact solution using Benders decomposition. It iteratively updates decisions of the two actors separately and converges to the global optimum. We illustrate the optimal CP leasing/placement strategy and hit probability gains under different association policies. Performance is maximized when the MNO association follows CP actions.

Mots clés: Wireless networks; Caching Policies; Routing Protocol; Decomposition Methods; Pricing Strategies

Domaines: Réseaux et télécommunications [cs.NI]; Optimisation et contrôle [math.OC]; Complexité [cs.CC]

Jonatan Krolikowski, Anastasios Giovanidis, Marco Di Renzo. Optimal Cache Leasing from a Mobile Network Operator to a Content Provider. IEEE International Conference on Computer Communications (INFOCOM), Apr 2018, Honolulu, United States. ⟨10.1109/infocom.2018.8486267⟩. ⟨hal-01663134⟩