By Miikka Poikselka, Harri Holma, Jukka Hongisto, Juha Kallio, Antti Toskala(auth.)

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Extra resources for Voice Over LTE: VoLTE

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G. ) Voice Video (live streaming) interactive gaming Video (buffered streaming) TCP-based, for example www, e-mail, chat, ftp, p2p file Sharing, progressive video and so on between any two terminals over the IP network. This critical IP connectivity capability is offered only in isolated and single-service provider environments in the Internet; closed systems compete on user base, where user lock-in is key and interworking between service providers is an unwelcome feature. Therefore, we need a global system – the IMS.

P-CSCF plays an important role in IMS emergency session handling as the P-CSCF is tasked to detect emergency requests in all possible cases and to select E-CSCF to handle the emergency session further. Interrogating Call Session Control Function: I-CSCF is a contact point within an communication service provider’s network for all connections destined to a subscriber of that network communication service provider. There are three unique tasks assigned for the I-CSCF: • Obtaining the name of the next hop (either S-CSCF or AS) from the HSS.

By sending a path switch request the target eNodeB indicates to the MME that the S1 interface needs to be switched from the source eNodeB to the target eNodeB. The MME updates the S-GW with the new eNodeB address information for the downlink of the user plane and confirms the relocation of the S1 interface towards the target eNodeB with a path switch ack (acknowledgement). The MME may also allocate a different S-GW and provide the target eNB with the necessary address information for the uplink of the user plane in the path switch ack message.

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