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LTE : Does it mandatory to have default bearer as a non - GBR bearer ?

+1 vote
LTE : Does it mandatory to have default bearer as a non - GBR bearer ?
posted May 5, 2014 by Ganesh Kumar

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1 Answer

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I think, its not.
LTE provides always on-IP connectivity to its users. To met this objective only a non-GBR bearer is sufficient.
However, there is no constraint, a GBR-bearer can also be used as a default bearer at the cost of more radio resource since when for a GBR bearer, eNodeB MAC scheduler need to reserve more resource as compare to non-GBR bearer.

answer May 6, 2014 by Vimal Kumar Mishra
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+2 votes

In LTE, when UE is first time attached to a network, it is usually allocated a default non-GBR bearer. Can this bearer be converted to a GBR bearer, without releasing the UE context at eNodeB?

+3 votes

MME sends radio bearer setup request with the same QCI twice. The Bearer ID is different but the QCI is the same and is already created. Ex:

Bid 8 QCI 4 radio bearer was created. Just before it was created, the PGW sent another Create bearer request (QCI4) due to the fact the T3 timer expired and it didn't get the Create bearer response.

So the MME send Radio bearer setup request:
Bid 9 QCI4

My question is if this is the normal behavior for the MME. It didn't check if the bearer with QCI 4 was already created.

After that, the mobile accepted the new Radio bearer and deleted the old one, as expected and explained in the 3 GPP.

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