Network slicing is an important concept for telecommunication companies for optimizing their infrastructure and providing customized services. In order to deploy them, it is necessary to fully understand the customer requirements. The Communication Service Management Function (CSMF) is an entity that has this task, acting as a gateway to translate these requirements towards the network slicing ecosystem. Even though we know the tasks for the CSMF, we find there is no complete definition of its internal elements and interactions. Our contribution is threefold: (i) we provide a comparison with current implementations and their weaknesses; (ii) we propose a complete model of the CSMF, its internal structure and its interaction with other elements of the network slicing infrastructure; and (iii) we demonstrate use case examples that show the functionality of the complete model.
Mobile TV receivers operate with a weaker link budget in the Digital Video Broadcast (DVB) network compared to the fixed rooftop mounted antenna receivers. Nevertheless, the cellular radio interface is an attractive alternative for broadcast services given its reliability. In light of the end-to-end service level convergence between the cellular and broadcast networks, we use Long Term Evolution (LTE) 's evolved Multimedia Broadcast Multicast Service (eMBMS) to multicast overhead parity packets among the multicast groups of mobile TV receivers (e.g. smartphones suffering from DVB packet erasures). The proposed multicast scheme recovers erased packets at each smartphone by Systematic RaptorQ Code (SRQC) decoding the directly received DVB transmission along with the overhead packets transmitted via eMBMS multicast. In this work we analyze the load generated in the Cellular Radio Access Network due to this erasure-recovery multicast scheme, and compare the gains of multicast over individual LTE unicast retransmissions of missing DVB packets.
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