SYS INFO 2

     

Neighbor cell description describes all the neighbor cells’ BCCH ARFCN. Currently, Huawei supports 32 neighbor cells at most. Except the fifth bit (BA_IND) and sixth bit (EXT_IND) of the second byte, the coding format of neighbor cell description is the same as cell channel description.

Extended indication (EXT_IND) is transmitted in system information 2 and 5. It indicates whether there are BCCH frequencies of neighbor cell transmitted in system information 2BIS and 5BIS. It has one bit. If it is set to “0”, this indicates system information 2 and 5 have carried all the BCCH frequencies (the same band as serving cell’s )in the BA table. If it is “1”, it means system information 2 and 5 carries only part of the content of BA table.

BA table indication (BA_IND) is transmitted in system information 2 and 5. It has one bit and it is used to tell the MS to decide whether to use the data of BA1 or BA2 table. In other words, if the current neighbor cell relationship and BA2 table are modified during the conversation of MS, BA_IND in system information 5 should be set to “1” instead of “0”. It instructs MS to re-decode the neighbor cell frequency shown in the system information to get the latest information.

Network Color Code Permitted (NCC Permitted) is transmitted on system information 2 and 6. It has eight bits.The eight bits are used to show if the particular NCC codes are permitted for the MS to access. If bit N is set to “0” (0<=N<=7), the MS will not measure the BCCH of the cell with NCC=N at all. Thus, the MS will not handover  to the cell with NCC=N.