GF82.70-P-0004-06SX Universal Portable CTEL Interface (UPCI (UHI)) General Information

GF82.70-P-0004-06SX Universal Portable CTEL Interface (UPCI [UHI]) General Information
- with CODE (494) USA version
- with CODE (387) Preinstallation for telephone "Handy", UPCI system, USA/Canada

Component Identification:

For vehicles with code (494) USA version, with code (387) Preinstallation for telephone "Handy", UPCI system, USA/Canada or with code (389) Mobile phone preinstallation with universal interface, USA/Canada, the mobile telephone network is a digital cellular wireless network in accordance with the Code Division Multiple Access (CDMA) standard. For vehicles with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system, the mobile telephone network is a digital, cellular wireless network in accordance with the Global System Mobile (GSM) standard. The CDMA or GSM standards stand for normalization of the Universal Portable CTEL Interface (UPCI [UHI]) system. The purpose is to offer compatible cellular phone services.

This system transfers dialing information, voice as well as data, digitally. Moreover, additional services are offered such as:
^ fee display
^ conference calls, calls waiting
^ identification of calling partner
^ call relaying
^ fax, with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system
^ access to text and terminals (ISDN compatible), with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system

Radio transmission in the mobile telephone network takes place between the portable CTEL (A34/6) and the Base Transceiver Station (BTS). The transmission frequencies vary depending on the frequency band, as shown in the following example:
^ Uplink (1850 to 1910 MHz), with code (494a) USA version, with code (387) Preinstallation for telephone "Handy", UPCI system, USA/Canada or with code (389) Mobile phone preinstallation with universal interface, USA/Canada
^ Downlink (1930 up to 1990 MHz), with code (494a) USA version, with code (387) Preinstallation for telephone "Handy", UPCI system, USA/Canada or with code (389) Mobile phone preinstallation with universal interface, USA/Canada
^ 900 to 1900 MHz, with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system

As from the Base Transceiver Station (BTS), all signals are forwarded by wire to the Base Station Controller (BSC).

In a cellular mobile telephone network, the Base Transceiver Stations (BTS) are arranged in such a way that the honeycomb- shaped radio cells form a mobile telephone network to supply the cellular phone subscribers. In high population centers, it is necessary for the radio telephone cells to serve a large number of subscribers while in rural areas, it is possible to cover larger radio reception and transmission areas. These radio telephone cells have a range of 100 m to 40 km, depending on the requirements. A feature of cellular mobile radio networks is the automatic handover from one radio cell to the next, without the cellular phone subscriber noticing anything.
If, during communication, the range of a Base Transceiver Station (BTS) is left and the subscriber moves into the transmission range of the next Base Transceiver Station (BTS), the communication can be continued without any interruption, although the transmitter of the next Base Transceiver Station (BTS) is transmitting on another frequency.

This handover procedure is accomplished within 5 to 10 ms. Transmission problems can occur if the cellular phone subscriber is located in valleys and low spots (radio shadows) or in areas with a small number of transceiver stations. However, these transmission problems can usually be eliminated by moving to a different location.
For vehicles with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system, it is possible to telephone abroad using the portable CTEL and the Subscriber Identification Module (SIM) card. A prerequisite is that the country concerned has the GSM standard, an appropriate agreement (roaming agreement) exists between the country and the network operator and the Portable CTEL has dual band or tri-band capability in accordance with the various frequencies. A radio cell is formed by the Base Transceiver Station (BTS) and is the actual transmitting and receiving terminal.

The Base Transceiver Station (BTS) sets up the connection to the portable CTELs, monitors the radio transmission and transmits the data by wire to the Base Station Controller (BSC).
In the GSM standard, with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system, 124 or 372 channels are available for each base transceiver station, depending on the frequency.
The Base Station Controller (BSC) is the controller unit for the Base Transceiver Station (BTS). The Base Station Controller (BSC) is connected between the Base Transceiver Station (BTS) and the Mobile Service Switching Center (MSC). Here, the desired data for voice and data communication is transferred as well as control and checking information. In addition to this, the Base Station Controller (BSC) is the central control point for automatic handover from one radio cell to another.

The Mobile Service Switching Centers (MSC) are interlinked and form the switching system in the mobile telephone networks with the CDMA standard, with code (494) USA version, with code (387) Preinstallation for telephone "Handy", UPCI system, USA/Canada or with code (389) Mobile phone preinstallation with universal interface USA/Canada, or with GSM standard, with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system. Here, the various databases and lists of visitors and visitor data are stored.

Databases and directories in the Mobile Service Switching Centers (MSC)
Home Location Register (HLR)
This is where subscriber master data are stored such as name, address, telephone number, service features, caller and call destination numbers, information about time, duration and charges for the call, and information about the radio cells in which a connection has been established and ended again.

Equipment Identification Register (EIR)
This is where the device-specific electronic identification number (IMEI number) of the portable CTELs is registered. This IMEI number is sent by the portable CTEL during registration. If the portable CTEL is blocked or stolen, access to the mobile phone network can be refused.

Visitor Location Register (VLR)
This is where the necessary data for a visiting subscriber is stored for a limited time.

Authentication Center (AC)
This is where the access authorization of the cellular phone subscribers is checked, and the relevant connection is switched.

The overall public mobile telephone network is designated as a Public Switched Telephone Network (PSTN).