Connected and Automated Systems

In SDN, Control is moved out of the individual network nodes and into the separate, centralized controller. The controller can, therefore, have a  complete knowledge of the network to  optimize flow management and support service-user requirements of scalability and flexibility. For example, bandwidth can be dynamically allocated into the data plane from the application.  Dynamic topology control (i.e., adjusting switch usage depending on load and traffic mapping)  becomes possible with the global network view. Furthermore, the network programmability  possible in SDN allows seamless communication at all levels, from hardware to software and  ultimately to end users (network operators). SDN challenges :                                                                      ...

SDN EPC is an implementation of Long Term Evolution Evolved Packet Core (LTE EPC) using design principles of SDN. It simulates the working of a typical EPC for handling signalling and data traffic. Using SDN: With an expansion in the number of versatile clients and activity, portable system administrators are thinking that it's hard proportional their radio and core systems. Further, network appliances are costly to acquire and redesign and are hard to adjust and program for new administrations. With SDN, the control and information planes of the packet core can be isolated, empowering less expensive bundle entryways in the information plane, and a savvy centre system controller to deal with the flagging and administration capacities. Architecture: A: Traditional LTE Core architecture B: SDN-based LTE EPC architecture The solution with SDN : A common SDN-based EPC is a partition of control and data pl...

Live VM migration is a technology used for load balancing and optimization of VM deployment in data centers. This process involves the transfer of OS instances, memory and local resources (eg: storage and network interfaces) to another node without shutting down the VM. But there are many unaddressed problems in this domain which arise due to the traditional network architecture.   I. CHALLENGES IN LIVE VM MIGRATION : Migration Algorithms should take into account the temporal network load and an end to end paths of pairwise VM flows dynamically, for this purpose the entire topology knowledge(network routes, link weights) must be fed into all the network elements after every topology update.This would couple the entire system too tightly with a given topology. Also in traditional architectures network, updates and new forwarding rules after each migration should be installed into each and every network element limiting the network optimization. II. SDN BASE...