ONF Connect 2018

Network Slicing is one of the key drivers for the Next Generation Networks. The concept had been introduced during 4G era, but it was not until the 5G Architecture was defined that the Network Slice Selection Function (NSSF) became a core part of the mobile network. Our scenario proposes an open source implementation of this network function. It aims to exploit the native capabilities of the CORD platform for creating slices. By using the M-CORD profile deployed as a Cord in a Box and including open source mobile components, we have achieved an E2E connection test-bed suitable for laboratories that lack equipment for deploying a full CORD-POD. Furthermore, we have extended the capabilities of the E2E connection by adding the NSSF component, thus allowing the selection of slices (Instances of SPGW) based on the information that UE provides at the moment of connection. The eNodeB and EPC are Open Air Interface (OAI) components, a suite of open sour projects developed by EURECOM. Modifications were required to the EPC in order to communicate with the NSSF for slice selection. Following 3GPP standard procedures, we added a step between the registration of the UE into the network and SPGW session establishment by coding an Interaction between the vMME and NSSF. The NSSF has a XOS service in charge of collecting the network information related to Slices (SPGW information). Once an Instance of a VM that houses the NSSF comes up, it stores the full topology information in a local data base. This Information will be used every time a request comes from the vMME to the NSSF for slice selection. Our testbed components are fully virtualized, due to that, the eNodeB follows an OAISIM (OAI UE Emulation/Simulation) implementation. The UE information can be manipulated in order to simulate multiple devices with distinctive information that is going to be used for Slice Selection. Our Scenario follows a M-CORD 4.1 implementation as it was the newest version available when we started our Test-bed design and development. In it, we showcase how new Network Components can be integrated with the M-CORD Platform to extend functionalities of a mobile network.