Nokia Mobile Phones Limited

Kalevi Malmi

Ari-Pekka Lajunen

Seppo M Alanara

Markku Tapio Oksanen

Juha Peranto

Ari Heinonen

Teppo Jylanki

Pekka Liukkonen

Jorma Virkkunen

A radio unit of a radio telephone set is provided with current input connections comprising separate identification inputs through which is indicated the type of phone module, and internal or external power supply thereof, which is connected to the radio unit. A control element in the radio unit is programmed to adjust the operating parameters of the radio unit in accordance with the type of phone module which is connected.

Radio unit for a telephone set with automatic adjustment of operating

A wireless communications system (1) has at least one base station, such as a personal base station (5), and a plurality of mobile stations (10) capable of wireless communications with the at least one personal base station. In response to input from a user of a first mobile station, a first step of a method transmits a message from the first mobile station to the personal base station, the message including a request for service and information specifying another mobile station. The message is received at the personal base station and the request for service is interpreted as being one of a plurality of types. In one embodiment the message is interpreted in accordance with a state of the mobile station when transmitting the message. By example, the request for service is interpreted as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state, or as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state. A next step of the method contacts at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call.

Call transfer and simplex call capability in a residential system using

Method and circuit arrangement for adjusting the volume in a mobile telephone. The telephone comprises a transceiver unit and on the other hand a physically separate operating device. A dc voltage level (DC) corresponding to the desired volume is adjusted with a potentiometer (1) in the operating device and the level is converted with an A/D-converter (2) into a corresponding digital control signal. The control signal is read with a microprocessor (3) in the transceiver unit, which further through the hold circuit (4) controls the gain of the audio amplifier (7). A multiplexer (5) may be provided for controlling and selecting a suitable feedback resistor (6) for the amplifier. The A/D-converter can be located in the operating device or in the transceiver unit. When it is located in the transceiver unit the dc voltage level (DC) is transmitted to the transceiver unit, preferably superimposed on the AC-signal received from the microphone, which then is filtered off before the A/D-converter. The connection between the operating device and the transceiver unit may be realized with a cable or a wireless infrared or radio connection.

Method and circuit arrangement for adjusting the volume in a mobile

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Salo, Finland

Kalevi Malmi