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Difference between SRB1 and SRB2 in lte ?

+5 votes
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Difference between SRB1 and SRB2 in lte ?
posted Nov 6, 2014 by Vikram Singh

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2 Answers

+2 votes

Difference between SRB1 and SRB2 is
1. SRB2 is established after AS security activation and SRB1 is established without AS security activation.
2. Prior to SRB2, SRB1 is used to send/receive piggyback NAS message with AS signalling msg.
3. SRB2 is used to send/receive NAS message.

answer Nov 7, 2014 by Veer Pal Singh Yadav
well explained.
commented Nov 10, 2014 by Ganesh Kumar
Thanks Ganesh
commented Nov 10, 2014 by Veer Pal Singh Yadav
+1 vote

Both signalling radio bearers are used to trans/receive lte signaling messages. SRB2 is used specifically for NAS signalling messages but if SRB2 is not at all present or established, SRB1 is used to trans/receive NAS messages.
SRB1 and SRB2 (optional) both are established at the time of attach procedure.

As soon as, the RRC connection setup procedure is finished UE and eNodeB both have SRB1 and once the RRC connection reconfiguration procedure is finished just after the RRC connection setup procedure, UE and eNodeB both may have SRB2.

answer Nov 6, 2014 by Neeraj Mishra
Similar Questions
0 votes
why SRB2 is implemented though ue have SRB 0,1 in LTE ?

we know
SRB0 is for rrc message on ccch ,
SRB1 rrc +nas messages on DCCH and SRB 1 has higher priority than SRB2
ok then y SRB2 is implemented ?
when SRB 2 is used ?
which type of messages v can expect in SRB2 ?

0 votes
LTE: Like default Radio configurations for SRB1 & SRB2 in RRC specs, Is there any default config for DRB?

For SRB's mentioned default parameter values :

RLC configuration CHOICE
ul-RLC-Config
>t-PollRetransmit
>pollPDU
>pollByte
>maxRetxThreshold
dl-RLC-Config
>t-Reordering
>t-StatusProhibit
Logical channel configuration
priority
prioritisedBitRate
bucketSizeDuration
logicalChannelGroup

So is their any default parameters value for DRB for RLC AM mode in LTE for UL & DL?

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