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LTE: Where S12 interface being used ?

+5 votes
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LTE: Where S12 interface being used ?
posted Jan 10, 2014 by Harshita

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2 Answers

+4 votes

S12:- Reference point between UTRAN and Serving GW for user plane tunnelling when Direct Tunnel is established. It is based on the Iu-u/Gn-u reference point using the GTP-U protocol as defined between SGSN and UTRAN or respectively between SGSN and GGSN. Usage of S12 is an operator configuration option.

answer Jan 10, 2014 by Sandeep
+3 votes

In a simple words "reference point between SGW of LTE and RNC of UMTS" known as S12. It is optional since data plane can be passed through S4 interface. S4 interface exists between SGW and SGSN.

answer Jan 10, 2014 by Vimal Kumar Mishra
When operator would like to configure S12 interface in place of S4 interface ?
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