lte

1. Basic Comparison of MIB between LTE 4G and NBIoT:
MIB – Master Information Block
MIB LTE 4G NBIoT
Type Downlink Channel Downlink Channel
Physical Channel used for
Transmission
PBCH, Physical Broadcast
Channel
NPBCH, Narrowband Physical
Broadcast Channel
Transmitted in Subframe 0 Subframe 0
Length 24 bits 34 bits
CRC polynomial used Highest power – 16 Highest power – 16
Generation Periodicity 40ms 640ms
Transmission Periodicity 10ms 10ms
Reference Signals CRS NRS and CRS
NRS Positions No NRS Calculated using Formula
No. of Reference signal in PBCH
Resource Grid per Subframe
48 Symbols 32 Symbols
Channel Encoding Tail Biting Convolution coding Tail Biting Convolution coding
Channel Decoding Viterbi Algorithm Viterbi Algorithm
Encoding rate 1/3 1/3
Decoding rate 3 3
Rate Matching rate 1/16 1/8
De-Rate Matching rate 16 8
Contained Information Bandwidth, System Frame
Number
Operating Mode, Location of
SIB1
About System Frame Number Provides complete information Provides partial information
Modulation Scheme QPSK QPSK
Allocated Sub Carriers 72 12
Allocated OFDM Symbols 4 11
Channel Bandwidth 1.4Mhz, 3Mhz, 5Mhz, 10Mhz,
15Mhz, 20Mhz
180Khz
No. of PRB’s Depends on Channel BW 1
Sub Carrier Spacing 15Khz 15Khz
Operating Mode Normal 4G In-Band, Guard Band,
StandAlone
No. of Antenna Ports used for
transmission
Ports Є {1, 2, 4} Ports Є {1, 2}
Scrambling Sequence
Generated using
Cell ID Cell ID
Scrambling Sequence Length 1920 bits 1600 bits
TTI, Transmission Time Interval 1ms 1ms
Latency ~10ms ~10ms
This document is prepared by Venkatesh Thalluri
For More post about LTE, NBIoT, 5GNR visit my profile:
https://www.linkedin.com/in/venkatesh-thalluri-57a64a125/

2. Transmitter Output in Different stages:
PBCH Transmitter LTE 4G NBIoT
Length 24 bits 34 bits
CRC Attachment 40 bits 50 bits
Channel Encoding 120 bits 150 bits
Sub Block Interleaver 128 bits 192 bits
RateMatching 1920 bits 1600 bits
Scrambling 1920 bits 1600 bits
Modulation 960 Symbols 800 Symbols
Resource Element Mapping 960 RE’s 6400 RE’s
Receiver Output in Different stages:
PBCH Receiver LTE 4G NBIoT
RF Receiver 960 RE’s 6400 RE’s
Resource Element De-Mapping 960 Symbols 800 Symbols
De-Modulation 1920 bits 1600 bits
De-Scrambling 1920 bits 1600 bits
De-RateMatching 128 bits 192 bits
De-Sub Block Interleaver 120 bits 150 bits
Channel Decoding 40 bits 50 bits
CRC Checker 24 bits 34 bits
This document is prepared by Venkatesh Thalluri
For More post about LTE, NBIoT, 5GNR visit my profile:
https://www.linkedin.com/in/venkatesh-thalluri-57a64a125/