21:39 - 
2 comments
2 comments
LTE RBs and their mapping between PDCP RLC MAC
LTE Radio Bearer
Query:
One UE can have the maximum 11 RB's ( 3 SRB and 8 DRB) as per the 36.331. I have referred like there is a one to one mapping between the RB's and LCID's at MAC level. But we have only LCID's 1 - 10. LCID 1 & 2 for SRB1,SRB2, rest are for DRB's. In this case how can we map among them.
Ans:
if you look closely you will find SRB0 is on CCCH and all others are on DCCH and DTCH .
And all the data goes through as MAC PDU isn't it and it has a MAC header ,you might have gone through the MAC header which is something like this
|R |R |E | LCID |
now LCID has value of 00000 for CCCH which is for SRB0 and the missing DRB which you were not able to map.
for all other values 00001 to 01010 identity of the logical channels starting from SRB1 till the others.
2 comments:
RBID range is between 0 to 31 but LCID range is 0 to 10. So if there is one to one mapping between rbid and lcid; then what's the point of having 32 rbid possible values?
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