By André Perez
This publication offers the structure of 2 networks that make up the spine of the phone carrier VoLTE and video provider ViLTE. The 4G cellular community makes it attainable to build bearers by which IP packets, containing both mobile signs (SIP, SDP) or voice or video media (RTP stream), are transported.
The IMS community plays the processing of the phone sign to supply VoLTE and ViLTE companies, together with name routing and the availability of extra companies. diverse tactics are defined: the set-up and termination of a consultation, interconnection with third-party networks, roaming and intra-system handover.
The inter-system handover PS-CS is a distinct case that happens whilst the cellular loses 4G community assurance over the process a consultation. The e-SRVCC mechanism allows continuity of the carrier through the change of the phone conversation to the 2G or 3G networks. The SMS provider for brief messages, that's a distinct phone provider in itself, is supplied via buildings, one hoping on the IMS community, and a moment at the CSFB functionality.
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Additional info for VoLTE and ViLTE: voice and conversational video services over the 4G mobile network
2. I-CSCF entity The I-CSCF entity is the specific point of contact within the IMS network for some transactions coming from the P-CSCF or S-CSCF entities. It performs the function of a PROXY SERVER. Upon receipt of the first SIP REGISTER request, the I-CSCF assigns an S-CSCF entity to the UE entity and transfers the request to the S-CSCF entity chosen. To fulfill this function, an exchange of DIAMETER messages with the HSS entity is necessary. Upon receipt of the second SIP REGISTER request and the first SIP INVITE request, for an incoming call, the I-CSCF entity queries the HSS entity for the IP address of the S-CSCF entity attributed to the UE entity and transfers the request to that S-CSCF entity.
Upon receipt of the second SIP REGISTER request and the first SIP INVITE request, for an incoming call, the I-CSCF entity queries the HSS entity for the IP address of the S-CSCF entity attributed to the UE entity and transfers the request to that S-CSCF entity. The I-CSCF entity forwards the data necessary for the generation of charging tickets. 3. S-CSCF entity The S-CSCF entity provides the UE entity with session control services. It performs different roles depending on the type of request received: – that of a REGISTRAR for the registration of the UE entity; – that of a LOCATION SERVER for the storage of the correspondence between the IP address and the URI identity of the UE entity; – that of a PROXY SERVER for the establishment of a session; – that of an UA, in abnormal operating conditions, when it has to terminate or generate SIP transactions.
Service request The service request is sent, when the mobile is in idle mode, to reestablish the default bearers on the LTE-Uu and S1-U interfaces. The service request is initiated by the mobile, by sending the EMM SERVICE REQUEST when signaling or traffic data is waiting. The mobile is notified of awaiting data at the level of the network by way of the paging procedure. The MME entity may reject the request, in which case it responds with the message EMM SERVICE REJECT. This response causes the switch of the mobile to the deregistered state.
VoLTE and ViLTE: voice and conversational video services over the 4G mobile network by André Perez