SYS INFO 2BIS

2BIS contains RACH control data and neighbor cell BCCH frequencies (part of BA1 list). It is optional and transmitted on BCCH. As the number of frequencies in BA1 list carried by SYS INFO 2 is limited; SYS INFO 2BIS carries the rest of the BCCH frequencies in the BA1 list that are from the same band as in SYS INFO 2. 

SYS INFO 2BIS - - Neighbor Cell Desc.
   - - RACH Control Parameter
      (Same as that in SYS INFO 1.)

 

Note 1: Currently Huawei GSM BSS supports up to 32 neighbor cells. And for GSM900 cells all these 32 neighbor cells’ BCCH can be transmitted via System Information 2 while using bit map0. Therefor,BA1 table can be completely delivered to the MS using system information 2. So, it is not necessary use System Information 2BIS.

Note 2: For GSM1800 cell, when the number of configured neighbor cells with the same band is more than 16, it will send system message 2BIS.