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What is IMS signalling in LTE?

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What is IMS signalling in LTE?
posted Feb 9, 2015 by Gnanendra Reddy

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2 Answers

+1 vote

On behalf of Bart -

This looks like a tricky question, but the answer to it is very simple.

IMS signaling for LTE network is just dumb payload. Like porn or CNN webpage.

How? Again, quite simple. IMS signaling does have nothing in common with Core Network. Mobile Network is transmitting it from UE to the Internet and back like it's transmitting the CNN webpage or porn. Same way, nothing special. Maybe except the QCI which is given to it, because GGSN/PGW was told by configuration to do so, or by PCRF if the P-CSCF has Rx with PCRF.

As you know, or at least you should, IMS uses SIP protocol to operate. SIP protocol except being a monstrous TEXT(sic!) protocol it does not interact with any Core node/element. It's pushed to its destination in a GTP Tunnel like everything else, where just before the Gi/SGi it's decapsulated and sent out to the Internet.

answer Feb 9, 2015 by Salil Agrawal
0 votes

Primary role of IMS in LTE is to provide service based charging for true LTE call over IP network. We call such type of call as VoLTE call (Voice over LTE). Here VoLTE call will not use 3G/2G achitecture to make voice call, rather it will use IMS backbone nodes (PCSCF, ICSCF, SCSCF etc)

Please check the following link: http://tech.queryhome.com/60183/what-the-role-ims-in-lte-technology-provide-the-voice-service

answer Feb 9, 2015 by Salil Agrawal
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Details can be found at : 3GPP TS 23.228 V10.5.0 (2011-06) page201 under clauses (E.2.1.0,E.2.1.1,E.2.1.2)

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