Abstract: A mobile communications system incorporates a plurality of home location registers on which subscriber data is stored such that each subscriber is allocated to a selected one of the registers for voice and/or data calls. Request messages for subscriber data can be routed to any home location register which responds to that request when the data for the respective subscriber is stored on that home location register. If the data for the respective subscriber is not stored on that home location register, the message is provided with an indicator component and is rerouted to another home location register for a further processing attempt. The number of times a message is rerouted is limited to prevent perpetual circulation of messages relating to unknown subscribers.

Abstract: In a method for voice transmission via radio interface in a digital radio communication system, at least one signal is transmitted between a mobile station and a base station. At least one characteristic value with respect to the transmission conditions of the radio interface is identified from the signal. The characteristic value or values are compared to a threshold and a voice encoder is selected according to the comparison result, with a voice encoder having a higher data rate being employed given good transmission conditions and a voice encoder having a lower data rate given poor transmission conditions. A base station system operating according to the method is also disclosed.

Abstract: An amplifier system for a radio receiver, comprising: an amplifier chain having a first amplifier for receiving a signal derived from a received radio signal and amplifying it to generate a first amplifier signal, and a second amplifier for receiving a signal derived from the first amplifier signal and amplifying it to generate a second amplifier signal; a sensor means for sensing the level of a signal at a point in the amplifier chain; and amplifier control means responsive to the sensor means for, when a relatively high level of signal is sensed, controlling the first and second amplifiers to improve their response.

Abstract: The objective of the present invention is to have a desired screen displayed with shortened waiting time in using functions for the electronic note, etc., while engaging in telephone talk. Another prime objective of the present invention is to achieve an easy-to-use mobile information terminal equipment which also functions as an electronic note, word processor, personal computer, and so on. In transitting from telephone mode (cover closed status) to information terminal mode (cover opened status), the screen to be displayed is determined to be either a historical information, talk log information, or user setting screen. This enables the user to obtain the desired screen with fewer number of operations and with less waiting time.

Abstract: A battery housing for an electrical device, such as a portable telephone, has a locking mechanism that locks the battery housing in place onto the housing of the portable device. The locking mechanism has a locking finger that is inserted into an opening in the device housing. The locking finger is spring mounted on the housing bottom of the battery housing and collaborates with at least one sliding surface which preferably has the shape of an inclined plane over which the locking finger can be forced out of the locked position by means of a movable key.

Abstract: An rf receiver front end that includes a switchable attenuation circuit or DX switch and uses a power saving technique. The switchable attenuation circuit is dc connected in series with one or more rf circuits so that power drawn from a constant voltage power supply is reduced. The rf circuit may include an rf mixer, a low-noise amplifier, or both.