BCH Transport Channel is used to carry BCCH. In LTE, BCH carries only Master Information Block (MIB) whereas all the SIB are transmitted using BCCH mapped on DL-SCH.
BCCH mapped to BCH as well as DL-SCH.
Transport Block size of BCH is set to 24 bits.
On this 24 bits , 16 bits CRC is added and makes 40 bits.
On 40 bits, 1/3 convolution coding is applied and converted in 120 bits.
On 120 bits, rate matching is applied and converted into 1920 bits.
This 1920 bits are spread across 40ms ( 4 frames). It means 4 frames carrying the original 24 bits.
X : MIB on PBCH on slot 1 on subframe 0
Y: MIB' on PBCH on slot 1 on Subframe 0
<---(X)---> <---(X) ---> <---(X)---> <---(X)---> <---(Y)---> <---(Y)---> <---(Y)---> <---(Y)--->
<-10ms-> <-10ms-> <-10ms-> <-10ms-> <-10ms-> <-10ms-> <-10ms-> <-10ms->
This is the type of information I’ve long been trying to find. Thank you for writing this information.
ReplyDeleteswiss taxi