Mobile phone system, establishing connection to mobile phone subscribers - GF82.70-P-0007-05GA
Illustrated on model 463.236
Depending on the equipment installed one of the following control units will be installed, hereafter referred to as the "audio unit":
- Radio (A2) (with code (EF5) MB Audio 20 CD radio, (NTG 2.5))
- COMAND operating, display and controller unit (A40/3) (with code (EU1) COMAND, APS)
Function requirements
- Status of circuit 30 "ON" or circuit 15R "ON".
- One mobile phone network is available in sufficient strength and quality
- Mobile phone system operating error-free
- Mobile phone and audio equipment switched on
- Enabled Subscriber Identification Module (SIM) card inserted in mobile phone
- Correct Personal Identification Number (PIN) entered, if set on the mobile phone
- Compatible mobile phone inserted into UPCI [UHI] cell phone holder (Universal Portable Cell Phone Interface) (A34/15), which is connected to Bluetooth module (A34/7) (with code (EH2) Comfort telephony), or Bluetooth-capable mobile phone authorized in vehicle and on the audio equipment (without code (EH2) Comfort telephony)
So that a bluetooth-capable mobile phone that is authorized on the audio equipment can be operated in the vehicle, the mobile phone must support the hands-free profile (HFP) 1.0 or 1.5. More information is available under:
- www.mercedes-benz-mobile.com
General information on establishing a connection in the mobile telephone system
Mobile telephone subscriber A has logged into the mobile telephone network through his/her mobile service switching center, and mobile telephone subscriber B has logged into the mobile telephone network through his/her mobile service switching center B and both are registered in their respective home location register.
Now both mobile phone subscribers can call each other via the following communication route:
- Mobile phone
- Base transceiver station
- Base station controller
- Mobile service switching center or mobile service switching center B
However, if cellular mobile telephone subscriber A or cellular mobile telephone subscriber B log into the mobile telephone network outside of the reception area of their mobile service switching center or mobile service switching center B, then both are entered into the visitor location register of the nearest mobile service switching center by the nearest base transceiver station and base station controller.
The nearest mobile service switching center automatically contacts the responsible home location register of the mobile service switching center for cellular mobile telephone subscriber A or the mobile service switching center B for cellular mobile telephone subscriber B and signals the present location of cellular mobile telephone subscriber A or cellular mobile telephone subscriber B.
However, if for example mobile telephone subscriber A now wishes to set up a conversation with mobile telephone subscriber B, he/she enters the latter's telephone number.
On the basis of this telephone number, the present location of cellular mobile telephone subscriber B can be determined by his/ her mobile service switching center B. With the information on the location, the mobile phone system then transfers the call from mobile phone subscriber A to mobile phone subscriber B via the best communication route.
The mobile phone system also automatically searches for the most favorable communication route during a phone call in order to minimize transmission losses.
The transmission route in the mobile telephone network consists of the following:
- Mobile phone
- Base transceiver station
- Base station controller
- Mobile service switching center or mobile service switching center B