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Why 1-4 EPS bearer identity is reserved and why the minimum value of EPS bearer identity is 5?

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Why 1-4 EPS bearer identity is reserved and why the minimum value of EPS bearer identity is 5?
posted Jul 30, 2015 by anonymous

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1 Answer

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These values are reserved because in case of inter-RAT mobility the EPS bearer identities are mapped to corresponding NSAPI's.

Please check 3GPP 24.008 TS - NSAPI values 0..4 are reserved.

answer Aug 3, 2015 by Salil Agrawal
what is NSAPI?
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+2 votes

Hello,

Pardon me, this is just a theoretical question. Not started my real testing yet. But so meantime trying to see I handle the basic possible scenarios.

In the CCR message of type (Initial Request), lets say PCRF receives both the "QOS" (containing APN AMBR UL and APN AMBR DL) and "Default Bearer QOS" AVP (containing QCI and ARP).
As of now, in my basic code, I return the QOS based on apn info received on "Called-station-ID" AVP. Will it be ok..Or is there any better suggestions on this ?

~p

+1 vote

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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