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Reply To: How does a mobile latch to GSM Network?

#48483
seth
Guest

This is an aproaching process:
#Scan 124 RF channels and measure
signal strength for 3-5 seconds
#Tune to the RF channel with the highest
received average signal strength
#Determine if it is a BCCH carrier by searching for frequency correction bursts.
#Is it a BCCH carrier? The MS shall attempt to synchronize to This carrier and read BCCH info
#Is it the wanted PLMN?
#Is the cell barred for access?
#Is C1 > 0?
#Camp on the cell
IF THE ONE OF THIS STAGES NOT ACCOMPLISHED THE MOBILE WILL TUNE AGAIN AT ANOTHER STRONGE FREQUENCY.

suvendu – 16 Dec 2005

Dear mr Jood,
my confiusion is regarding the process by which a MS search for network just after switch on..
so pls tell me those process…
means when it will scan forBCCH etc

jood – 15 Dec 2005

Hi suvendu
Attempt to access the home PLMN(broadcasted at BCCH) are performed as specified
bellow:
1 The periodic attempts are only performed in automatic mode
when the MS is roaming in its home country.
2 After power on, a period of at least n minutes and at most T
minutes is elapsed before the first attempt is made.
3 The MS makes an attempt if it is on the visiting PLMN at
time T after the last attempt.
4 Periodic attempts are only to be performed by the MS while
in idle mode.
5 If the home PLMN is not found, the MS remains on the
visiting PLMN