Kablosuz ağlar için bir yazılıma dayalı ağ yaklaşımı

The tremendous growth in wireless Internet use is showing no signs of slowing down. Existing cellular networks are starting to be insufficient in meeting this demand in part due to their inflexible and expensive equipment as well as complex and non-agile control plane. Software-defined networking (SDN) is emerging as a natural solution for the next generation cellular networks as it enables further Network Functions Virtualization (NFV) opportunities and network programmability. In this dissertation, we advocate an all-SDN network architecture with hierarchical network control capabilities to allow for different grades of performance and complexity in offering core network services and provide service differentiation for 5G systems. As a showcase of this architecture, we first introduce a unified approach to mobility, handoff and routing management and offer Connectivity Management as a Service (CMaaS). CMaaS is offered to application developers and over-the-top service providers to provide a range of options in protecting their flows against subscriber mobility at different price levels. Next, we present the implementation details of a distributed SDN controller specifically crafted to realize the proposed all-SDN architecture and investigate the flow-level performance characteristics of the system.