SYS INFO 5

SYS INFO 5

It describes the neighbor cell BCCH frequencies(BA2 list). It is mandatory and is transmitted on SACCH. Different from SYS INFO 2, MS can read the frequency described in SYS INFO 5 in dedicated mode, report the relevant information of neighbor cells in measurement report, and use it as the basis for handover. Similarly, for 900 MS of PHASE 1, it only recognizes the neighbor cell frequency information described by SYS INFO 5, and ignores that carried by SYS INFO 5BIS and 5TER.

 

Corresponding to System Information 2(System Information 2 describes BA1),System Information 5 is part of the BA2 table. It is used when MS is in the dedicated mode. Generally, the contents of BA1 and BA2 are the same. In special cases,such as they are modified for radio network optimization purpose, their contents can be different.

  

SYS INFO 5 BIS

5 BIS describes neighbor cells’ BCCH frequencies.These frequencies are part of BA2 list. It is optional and is transmitted on SACCH. Generally, as the number of frequencies which can be described by SYS INFO 5 is limited, SYS INFO 5 BIS carries the rest BCCH frequencies in the BA2 that are belong to the same band as SYS INFO 5 for transmitting to MS.

 

Corresponding to System Information 2BIS(2BIS is for BA1), the content of 5BIS is part of the content of BA2 table. It is used when MS is in dedicated mode. The neighbor cells’ frequencies which belong to the same band as the serving cell BCCH will be put into 5BIS for transmitting to the MS while there is no room in System Information 5.

SYS INFO 5TER

5 TER describes neighbor cells’ BCCH frequencies,these frequencies are also part of the BA2 list. It is transmitted on SACCH channel. Similarly, only dual band MS can read this information, and single band GSM900 or GSM1800 MS will ignore it. It carries the BCCH frequencies of neighbor cells whose band are different from the serving cell’s.

 

Corresponding to System Information 2TER,(2TER is for BA1)the content of the 5TER is part of the content of BA2. It is used when MS is in the dedicated mode. The neighbor cells’ frequencies which belong to the different band (900, 1800)from the serving  cell in the BA2 will be put into 5TER for transmitting to the MS.