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Mobile networks are undergoing fast evolution to software-defined networking(SDN) infrastructure in order to accommodate the ever-growing mobile trafficand overcome the network management nightmares caused by unremittingacceleration in technology innovations and evolution of the servicemarket.Enabled by virtualized network functionalities, evolving carrierwireless networks tend to share radio access network (RAN) among multiple(virtual) network operators so as to increase network capacity and reduceexpenses.However, existing RAN sharing models are operator-oriented, whichexpose extensive resource details, e.g. infrastructure and spectrum,toparticipating network operators for resource-sharing purposes. Theseold-fashioned models violate the design principles of SDN abstraction and areinfeasible to manage the thriving traffic of on-demand customized services.This paper presents SOARAN, a service-oriented framework for RAN sharing inmobile networks evolving from LTE/LTE advanced to software-defined carrierwireless networks(SD-CWNs), which decouples network operators from radioresource by providing application-level differentiated services. SOARAN definesa serial of abstract applications with distinct Quality of Experience (QoE)requirements. The central controller periodically computes application-levelresource allocation for each radio element with respect to runtime trafficdemands and channel conditions, and disseminate these allocation decisions asservice-oriented policies to respect element. The radio elements thenindependently determine flow-level resource allocation within each applicationto accomplish these policies. We formulate the application-level resourceallocation as an optimization problem and develop a fast algorithm to solve itwith a provably approximate guarantee.

SOARAN: A Service-oriented Architecture for Radio Access Network Sharing in Evolving Mobile Networks