# Why 1.4Mhz is the Minimum Bandwidth in LTE

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Why 1.4Mhz is the Minimum Bandwidth in LTE
posted Sep 25, 2015
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LTE Supports 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz frequency band in which 10 & 5 are most common frequency band and 3 & 1.4 least common frequency band.

Whenever we switch on the mobile to find out the frequency band it looks for the sync signal which is transmitted at the center of frequency for 1.4Mhz i.e. 72 subscribers. That could be the reason why 1.4 MHz is minimum. Waiting for others to comment :)
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Why can't we just calculate total the amount of data, which is to be send using amount of available REs for data transmission, code rate and modulation?

+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