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Can GTP-TEID be same for multiple Bearer?

+2 votes
Can GTP-TEID be same for multiple Bearer?
posted Aug 20, 2013 by Bob Wise

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3 Answers

+2 votes
Best answer

Can you specifiy which GTP-TEID you mean here ? GTP-C TEID or GTP-U TEID ?

If you asked for GTP-U TEID, then there has to be a one to one mapping between a GTP-U TEID and the EPS bearer at different end points like eNodeB, S-GW and PDN-GW, across their supported interfaces on the data flow path.

If it is a GTP-C TEID, then it is interpreted differently across different interfaces
1. On S11, there has to be only one pair of GTP-C TEID (one on MME and the other on S-GW) for one UE. This must be shared for all the control messages' related operations related to this UE.
2. On S5/S8, the GTP-C TEID has to be unique per PDN connection. And this has to be shared among all the EPS bearers which use this PDN connection. (However the spec doesn't mention anything about the UE here).

Some more interfaces like S3, S10, S16 which are dependent on LTE, See spec 29.274 section 4.1

answer Aug 26, 2013 by Shwetha Vittal
+1 vote

It has to be unique across all bearers for that end point pair(eNB-SGW pair OR SGW-PGW pair). It is the TEID that uniquely identifies the bearers.

answer Aug 25, 2013 by Chandra Javalkar
Could you please explain that do I have a chance to keep the same TEID between eNB-SGW and SGW-PGW pairs or should I change the TEIDs according to the end points.
–1 vote

In LTE, each bearer will be identified by TEID, so it should not be same multiple bearer.

answer Nov 14, 2013 by sivanraj
Hi, could you please suggest the spec where i can get the clarification for the same(1 UE is having 2 bearers and what would be the teid of eNB for first and second bearer)
Spec is 3GPP 29.281 but pinpointing the specific location is difficult.
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+3 votes