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What is the difference or need of having different flavors of GTP (V2- CONTROL and V1- USER) in LTE network?

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What is the difference or need of having different flavors of GTP (V2- CONTROL and V1- USER) in LTE network?
posted Jan 12, 2017 by anonymous

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1 Answer

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GPRS Tunneling protocol has multiple variants such as GTPv1-C, GTPv1-U, GTPv2-C. If you look into GTPv1-C and GTPv2-C header then you can easily make out the difference and why GTPv2-C is being used for LTE signalling among MME, SGW and PGW . One major difference what I found GTPv2-C can piggyback multiple messages but GTPv1-C does not have support of piggybacking. However there was no requirement on change of GTPv1-U so it is being used in LTE as it is.

References
Spec 29.060
Spec 29.281
Spec 29.274
https://en.wikipedia.org/wiki/GPRS_Tunnelling_Protocol

answer Jan 13, 2017 by Harshita
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I have seen GTP control messages and found that F-TEID consists of an IP address and 32 bit long Tunnel Id. For example: Create Session Response message contains control plane F-TEID and user plane F-TEIDs. I have a question here, why not only TEIDs are included in Create Session Response message when IP address would be common ? or Does it mean control and user plane both F-TEIDs may have different IP address ?

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