LTE - MFBI

MFBI - Multi Frequency Band Indicator

EnodeB will inform UE about Multiple Overlapping bands it supports in the SIB1 message provided if MFBI is enabled in the EnodeB.

Consider an example of Serving Band 4 by an EnodeB in a particular Cell. The corresponding Overlapping Band in the FDD is Band 10.

Frequency info:

Band 4:

DL Bw: 2110 to 2155 Mhz
UL Bw: 1710 to 1755Mhz

Band 10:

DL Bw: 2110 to 2170 Mhz
UL Bw: 1710 to 1770 Mhz

So from the Serving BW's its clear that both the Band 10 & 4 are overlapping each other in a range of 45Mhz

Why MFBI?

Now a UE is trying to latch on the Band 4, But the UE wont support band 10, due to the enabling of MFBI, UE will unknowingly latch on to the Band 10 as well.

Overlapping Bands in FDD & TDD:

E-Utra Operating Bands	Overlapping E-Utra Bands	Duplex Mode
2	25	FDD
3	9	FDD
4	10	FDD
5	18, 19, 26	FDD
9	3	FDD
10	4	FDD
12	17	FDD
17	12	FDD
18	5, 26, 27	FDD
19	5, 26	FDD
25	2	FDD
26	5, 18, 19, 27	FDD
27	18, 26	FDD
33	39	TDD
38	41	TDD
39	33	TDD
41	38	TDD