Friday, 30 October 2015

LTE System Information Broadcast Overview

 1、System Information Broadcast in LTE
 

System information parameters are broadcast to UEs.
for cell selection and cell re-selection
UE must camp on best cell to be ready for service(s)
to receive paging information from network
MT call or MT packet session setup initiated by network
to inform the UE (user) about Tsunami or Earthquake warning (ETWS)
to access the radio network via UL (DL) common channels
access parameter and access scheme to start a connection
System Information provides
Access Stratum information
eUTRAN related parameters
e.g. RRC setup Timers and Constants
Non – Access Stratum information
Core network related parameters
e.g. Tracking Area Code, MCC, MNC (PLMNId)
UE shall consider received BCCH information valid for 3h.

  2、System Information Structure
 
 
•UE knows where to find Master Information Block
MIB is broadcast in the Physical Broadcast Channel (PBCH)
in MIB UE receives basic system information
• On receiption of System Information Block 1
UE is able to receive scheduling information for all other SIBs
SIB 2..SIB 7 supported in RL10
SIB 2..SIB 7 are scheduled on PDSCH similar like other user data or
signaling – so UE needs to know where to listen and receive
  3、System Information Blocks overview
System Information Block 1
Information relevant when evaluating if a UE is allowed to access a cell and defines the scheduling of other system information blocks.
System Information Block 2
Contains common and shared channel information
System Information Block 3
Contains cell re-selection information, mainly related to the serving cell
System Information Block 4
Contains information about the serving frequency and intra-frequency neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific re-selection parameters)
System Information Block 5
Contains information about other E-UTRA frequencies and inter-frequency neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific re-selection parameters)
System Information Block 6
Contains information about UTRA frequencies and UTRA neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific re-selection parameters)
System Information Block 7
Contains information about GERAN frequencies relevant for cell re-selection (including cell re-selection parameters for each frequency)
System Information Block 8 (planned for RL20)
Contains information about CDMA2000 frequencies and CDMA2000 neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific re-selection parameters)
System Information Block 10 (planned for future release)
Primary Tsunami and Earthquake Information
System Information Block 11 (planned for future release)
Secondary Tsunami and Earthquake Information

Budi Prasetyo

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