Logical channel ID and Logical Channel group.
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To understand this, we need to understand little about bearer (SRB/DRB). A Radio bearer is a logical connection between the UE & eNodeB.
Except SRB 0, all RB's make use of dedicated resources assigned by eNodeB.
SRB 0 is used when there is no RRC connection exist.
==> In LTE system, there exists three SRB i.e. SRB0, SRB1 and SRB2 and corresponding logical channel identities are 0, 1 and 2 respectively. These identities are fixed as per specification.
==> In LTE system, there exists at max 8 DRB and corresponding logical channel identities are 3 to 10 respectively.
DRB & EPS bearer has one to one mapping, so it means there can at max 8 EPS bearer. An EPS bearer is logical connection between UE & P-GW.
==> Logical channel ID = DRB ID + 2 as 0, 1 and 2 identity is used for SRB.
Logical channel Group - There are maximum 4 logical channel group and each logical channel belongs to some logical channel group.
Logical channel ID are aggregated in a logical channel group based on some parameters like similar QoS.
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========================================================================
To understand this, we need to understand little about bearer (SRB/DRB). A Radio bearer is a logical connection between the UE & eNodeB.
Except SRB 0, all RB's make use of dedicated resources assigned by eNodeB.
SRB 0 is used when there is no RRC connection exist.
==> In LTE system, there exists three SRB i.e. SRB0, SRB1 and SRB2 and corresponding logical channel identities are 0, 1 and 2 respectively. These identities are fixed as per specification.
==> In LTE system, there exists at max 8 DRB and corresponding logical channel identities are 3 to 10 respectively.
DRB & EPS bearer has one to one mapping, so it means there can at max 8 EPS bearer. An EPS bearer is logical connection between UE & P-GW.
==> Logical channel ID = DRB ID + 2 as 0, 1 and 2 identity is used for SRB.
Logical channel Group - There are maximum 4 logical channel group and each logical channel belongs to some logical channel group.
Logical channel ID are aggregated in a logical channel group based on some parameters like similar QoS.
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I understand UE can have upto 11 bearers (Dedicated + default) but LCID for logical channel(SRB + DRB)have 10 possible values... how does it work.. ?
ReplyDeleteSRB0 is CCCH, it is common bear for all the UEs, LCID for SRB0 is just 0000.
DeleteLCID value 0,1,2 are used to SRB0, SRB1 and SRB2 respectively.
ReplyDeleteAnd LCID 3 ~ 10 are used for DRB1 ~ DRB8 respectively.
DRB1 means LCID 3
DRB8 means LCID 10
LCID value 0 used to SRB0
ReplyDeleteLCID value 1 used to SRB1
LCID value 2 used to SRB2
LCID value 3 used to DRB1
LCID value 4 used to DRB2
LCID value 5 used to DRB3
LCID value 6 used to DRB4
LCID value 7 used to DRB5
LCID value 8 used to DRB6
LCID value 9 used to DRB7
LCID value 10 used to DRB8
since group of LCID is mapped to one LCG. please help understanding which LCID's are grouped....
Please can you mention how many LCID clubbed as one LCGID
ReplyDeleteex:LCID0,LCID1,LCID2=LCGID0 like this