MIB Decoding in LTE

MIB Decoding:

i) DL Bandwidth, Number of Transmit Antenna, Reference Signal Transmit Power
ii) System Frame Number (SFN)
iii) PHICH Configurationiv) Transmit every 40 ms(used for HARQ ACK/NACK)
iv)The MIB uses a fixed schedule with a periodicity of 40 ms and repetitions made within 40 ms.
v)The first transmission ofthe MIB is scheduled in subframe #0 of radio frames for which the SFN mod 4 = 0, and repetitions are scheduled insubframe #0 of all other radio frames.

MasterInformationBlock ::= SEQUENCE 

{
dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100}, 

phich-Config PHICH-Config,
systemFrameNumber BIT STRING (SIZE (8)),
spare BIT STRING (SIZE (10)
}

 Query: How does the UE read MIB?

• The MIB is transmitted on physical channel (BCCH-BCH-PBCH) and it always occupies the central 72 sub carriers in the Frequency domain irrespective of the channel bandwidth.
• The first transmission of the MIB is scheduled in sub-frame number 0 of radio frames for which the SFN mod 4 = 0
• repetitions are scheduled in sub-frame 0 of all other radio frames