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What is the status of EPS bearers when UE hits RL failure?

+2 votes
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What is the status of EPS bearers when UE hits RL failure? Is it the same case when UE moves to ECM idle state due to inactivity?

posted Nov 10, 2016 by anonymous

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1 Answer

+1 vote

User inactivity timer is controlled by eNodeB for an UE. If there is no data flow in duration of this timer, after expiry eNodeB triggers release procedure. However in the RF (radio link failure) case, eNodeB PHY detects and reports to upper layer. RRC runs a timer and wait for RRC connection re-establishment request message.
If re-establishment request does not receive within the timer, eNodeB initiates UE context release procedure towards for MME that this particular UE.
In case of RLF, data would not be delivered to UE, it will be buffered.

answer Nov 10, 2016 by Harshita
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Is EPS bearer ID and RAB ID common for all UE ? or RAB ID will be unique for default bearer ?

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+1 vote
Max. No of DRB in LTE 8 or 11 ?? Also DRB ID vs EPS Bearer ID

Hi All,

It is mentioned in different websites that in LTE max. of 8 DRB can be established per UE. But as per page 652 of 36.331 V13.2.0, the max no. of DRB is 11.
"maxDRB INTEGER ::= 11 -- Maximum number of Data Radio Bearers"

Based on what source are we saying that max. DRB in LTE is 8 and not 11.

It was mentioned in one of the old threads the following:

If EPS bearer ID is = x +4 ;
Then
DRB ID = x;
Logical Channel ID = x + 2

I found the above relationship of DRB ID & EPS Bearer ID to be true for one of the eNB vendors but not for another one.

Example:
EPS ID is 5 and DRB ID is 4 instead of 1. Can somebody comment in this?
NOTE : All these ranges is with respect to DRB establishment

EPS Bearer ID Range is INTEGER (0..15) (But 0-4 is reserved so we use starting from 5 )
DRB ID Range is INTEGER (1..32) (As in LTE max 8 DRB can be established per UE so we use from 1-8)
Logical Channel ID range for DRBs is INTEGER (3..10) ( For for DRB1 we use 3 as logical channed ID)

Thanks

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