Workload displacement and mobility in an omnipresent cloud topology

Latency and throughput demands on cloud hosted services are growing more complex as cloud services are at an increasing rate being consumed on mobile devices. On mobile devices, cloud services are accessed through a WAN and a mobile access network, through which latency is added and throughput restricted, resulting in an inconsistent user experience. The proposed omnipresent cloud topology paradigm attempts to remedy this latency decay by placing generic cloud data centres, of arbitrary size, in closer geographic proximity to the end user, thus reducing the geographic discrepancy that contribute to congestion and latency. A key performance challenge in the omnipresent cloud paradigm is the incurred cost of service migration as a result of user mobility. In this paper we examine fundamental resource costs and dynamics of user mobility in an omnipresent cloud topology. Furthermore, this paper also propose and evaluates a simulation model capturing the fundamental dynamics of an omnipresent cloud architecture in an extreme operating scenario. Our simulations reveals that mobility significantly affects the proportion of sessions that are migrated between consecutive nodes and that migration can consume up to 20% of the systems resources.