Chapter 14 393
Real Time TDMA Formats
Enhanced Observed Time Difference (E-OTD)
Broadcast Control Channel (BCCH)
The broadcast control channel (BCCH) informs the mobile station about specific system parameters it needs
to identify the network. These messages include among others, Location Area Code (LAC) and the Mobile
Network Code (MNC). The BCCH appears once every 51-frame multiframe and lasts for four frames
(occurring in frames 2,3,4, and 5). System information messages contain various information for a mobile
station and are transmitted on the BCCH at different times. The ESG implementation will include only the
system information 3 (SI3) message repeated once per 51-frame multiframe. The SI3 message for the ESG
implementation will have four user definable fields and the rest will be fixed. The user definable parameters
are cell identity, which identifies a cell within a location area and the location area identification. The
location identification is made up of the three parameters listed below:
MNC The mobile network code consists of 12 bits of data. Normally eight bits are used but for
PCS1900 NA, federal regulation mandates that a 3-digit MNC will be used. If two digits
are used then the upper 4 bits of the field are fixed to 1111. For the ESG implementation
the upper four bits are set to 1111 and the field range is 0–255. This field identifies the
network operator.
LAC The location area code provides 16 bits to allow network administrator to define a
location.
MCC The mobile country code defines the country the base station is in.
The following SCPI commands can be used to modify or query the system information 3 (SI3) user
definable parameters:
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:CELLid <val>
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:CELLid?
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:MNC <val>
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:MNC?
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:MCC <val>
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:MCC?
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:LAC <val>
[:SOURce]:RADio[1]|2|3|4:GSM:SLOT0:NORMal:ENCRyption:BCH:LAC?
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