System information (SYS INFO) contains network parameters
sent to MS through air interface(Um), including network identity parameters,
cell selection parameters, system control parameters and network function
parameters. By reading system information, MS can access the network, perform
cell selection, fully utilize various services provided by the network, and
achieve favorable cooperation with the network. SYS INFO can be divided into
two parts:
SYS INFO sent on BCCH, including SYS INFO 1, 2, 2BIS,
2TER, 3, and 4, which are used by MS in idle mode.
SYS INFO sent on SACCH, including system information 5,
5BIS, 5TER, and 6, which are used by MS in dedicated mode. Additionally Huawei
BSC supports the system information 7 and 13
to support GPRS.
BCCH system information belongs to common channel
information. SACCH system information
basically belongs to TRX management information. Common channel and TRX management information
should be selected in order to observe all the system information when tracing
on the layer 3 messages of radio interface.
Version G2BSC3203.0520B onwards, the system information
1, 2, 2TER, 3, 4, 5, 5TER, and 6 are default when system information is
transmitted to cells. System information 2BIS and 5BIS are conditionally
transmitted on GSM1800 cells. It will be explained in the following section.
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