MFBI indicates the support of multiple bands in one radio frequency cell
A cell is broacasting on a frequency that may belong to several overlapping bands of one technology
Some LTE overlapping bands : 2 / 25 or 4 / 66 or 5 / 26 or 12 / 17 or TDD 38 / 41; list available for LTE bands (Band overlap) or UMTS bands
For instance :
The serving cell broadcasts in SIB 1 the list of overlapping bands supported, in SIB 5 for the neighbor cells
MFBI may also be applied to UMTS bands in SIB 6
SystemInformationBlockType1 freqBandIndicator = 25 SystemInformationBlockType1-v8h0-IEs multiBandInfoList freqBandIndicator = 2 SystemInformationBlockType1-v1250-IEs freqBandIndicatorPriority-r12 = True
The UE indicates the support of MFBI in the FGI bit 31
The UE can connect to the cell using the arfcn of any of the bands supported by the UE and listed in SIB1
UE-EUTRA-Capability
featureGroupIndicators '11111111 00001101 11001000 100000 1 0'
freqBandPriorityAdjustment-r12 supported
Cell System Info | UE Capabilities | ||||
Band 2 | Band 25 | Band 2 FGI MFBI |
Band 25 FGI MFBI |
Band 2 + 25 FGI MFBI |
|
Band 2 | B2 | - | B2 | - | B2 |
Band 2 + MFBI B25 |
B2 | - | B2 | B25 | B2 |
Band 2 + MFBI B25 + FBI Priority |
B2 | - | B2 | B25 | B25 |
Band 25 | - | B25 | - | B25 | B25 |
Band 25 + MFBI B2 |
- | B25 | B2 | B25 | B25 |
Band 25 + MFBI B2 + FBI Priority |
- | B25 | B2 | B25 | B2 |
RRC downlink, the eNb will calculate the arfcn of the RRC signalling according to the band(s) supported by the UE
RRC uplink, the eNb accepts any of UE uplink arfcn
An example of earfcn range for B2 / B25 for the PCS band