SYS INFO 4

SYS INFO 4

It consists LAI, RACH, cell selection parameters and optional CBCH channel information. It is transmitted on BCCH. When the system supports cell broadcast function, CBCH together with the CBCH MA describe the configuration of CBCH and the relevant frequency information.

 

SYS INFO 4  

                       - - LAI

                     - -  Cell Selection Parameter

                     - -   RACH Control Parameter

                     - -  CBCH Channel Desc. (optional)        

                     - -  CBCH Mobile Allocation(optional)                    

                - -  SI4 Rest Oct.(parameters related to cell reselection

SI4 Rest Oct.

It contains the following parameters:

Cell reselection parameter indicator (PI)

Cell Bar Qualify (CBQ)

Cell Bar Access (CBA)

Cell_Reselect_Offset (CRO)

Temporary_Offset (TO)

Penalty_Time (PT)

  

Cell reselection is conducted on the basis of C2 value. C2 is obtained by the calculation of a series of parameters. If Cell Selection Parameter “ACS” is set as “No”, it means MS will use the relevant parameters in SI4 Reset Oct.to calculate Cell Reselection Parameter C2. If ACS is “Yes”, it means MS should extract cell reselection related parameter PI and C2 calculation related parameters from the residual bytes of system information 7 or 8.