Abstract: A properly modulated carrier signal exits transmission circuitry (201) and enters a first and a second mixer (203, 205). The modulated carrier is mixed with a first and a second function by the first and the second mixers (203, 205). The functions are generated by a first and a second signal generator (207, 209). The mixed signals exit the mixers (203, 205), and are amplified (via amplifiers 211-213), to be radiated by an antenna (211). The antenna (221) comprises two orthogonal antenna elements (215, 217), that are in close proximity with one another (although not in contact). One of the mixed signals is radiated on a first element (215), and the other mixed signal is radiated on the second element (217). The resulting signal transmitted from the antenna (221) is the original carrier signal having the plane of polarization constantly changing. Thus a reflected signal emitted an instance earlier cannot interfere with a wave currently emitted.

Abstract: This invention relates to a portable terminal equipment which receives intermittently a control channel transmitted from a cell station in a standby state. When the equipment shifts to the standby state, the equipment is brought into a receiving state to receive intermittently the control channel (PCH) for a set period of time W1 at every 1.2 seconds (ST22-ST25 and ST32). In addition, the equipment judges the receiving state from judging information of the receiving state such as the intensity of the electric field in receiving time and the presence/absence of an error in the received data (ST27 and ST33). In a power saving mode, when the equipment keeps on receiving the control channel in a good state for a set period of time while the equipment receives the control channel at every 1.2 seconds, the equipment is brought into a receiving state to receive the control channel at every 2.4 seconds (ST33-ST35).

Abstract: The present invention seeks to provide a dual mode mobile satellite communication unit, which requires low communication cost and very little battery power, does not require always carrying a large unit frame and does not always provide great weight burden on the user. A terrestrial communication portable unit is detachably mounted in the mobile satellite communication unit. The mobile satellite communication unit as base unit does not include a key operating section, a display section and a speech transducer section having a microphone and a loudspeaker, and utilizes those mechanically assembled on the portable unit side for keying and other operations. In an interlocked relation to the removal of the portable unit, the stand-by state of the base unit is turned off. It is thus possible to avoid wasteful battery power consumption on the base unit side.

Abstract: A phone including a CPU controlling a plurality of applications, a working storage that holds data and programs used in said applications and storage means acting as a clipboard when copying and pasting data from one application to another. Via the keyboard of the phone data contained in one application may be selected for copying to a clipboard. The CPU identifies predetermined types of subitems in the contents of the data copied to the clipboard. When pasting, said types of subitems may be displayed for individual pasting from the clipboard into the position in said another application appointed by the pasting command.

Abstract: Systems and methods for locating a remote station within an area of a wireless communications network without using a global positioning system. Communications are established between a remote station and a plurality of base stations using separate time slots within at least one over-the-air loop. Propagation delay times associated with signals transmitted or received within the time slots are determined, and one or more possible locations of the remote station are identified based upon the determined propagation delay times.

Abstract: In an RF front end portion for processing a radio-frequency signal in a portable telephone, a low pass filter allowing passing of only a signal in a frequency band lower than a radio-frequency signal component band is arranged between a circuit processing a high power signal and a control circuit controlling operation of the radio-frequency signal processing circuit. The radio-frequency signal processing circuit is a transmission/reception multiplexing circuit transferring a transmission signal of the portable telephone to an antenna or receiving a reception signal from the antenna, and the control circuit is a transmission/reception control circuit determining an operation mode of the transmission/reception multiplexing switch. Alternatively, the radio-frequency signal processing circuit includes a power amplifier amplifying a signal to be transmitted, and a gate voltage control circuit generating gate bias voltage controlling a gain of the power amplifier.

Abstract: A telecommunications system and method is disclosed for optimizing the Call Forwarding on Busy (CFB) feature for optimized mobile stations (MSs) within a satellite network. The CFB feature for optimized calls can be stored within the Home Location Register (HLR) associated with the MS. Therefore, when the MS becomes engaged in an optimized call, the HLR sets a busy indication associated with the optimized MS. Thereafter, when another incoming call arrives, the HLR can check the busy indication, and if it is set, the HLR determines that the MS is busy, and invokes the CFB feature.

Abstract: A technique for providing a secure link when transitioning between pairs of link layer protocol entities in a mobile communication system is disclosed. The first pair of link layer protocol entities includes a first transmitting link layer protocol entity and a first receiving link layer protocol entity. The second pair of link layer protocol entities includes a second transmitting link layer protocol entity and a second receiving link layer protocol entity. The technique is realized by first suspending data transmissions from the first transmitting link layer protocol entity to the first receiving link layer protocol entity, and then initiating data transmissions from the second transmitting link layer protocol entity to the second receiving link layer protocol entity.

Abstract: A radio receiver operable for communication in a radio system in which information is transmitted on respective channels in bursts. Each burst has a field for enabling the radio receiver to synchronise therewith. The radio receiver has an adjustable internal clock for timing receiving signals. Adjustment of the internal clock can be suspended if an error field in a received signal indicates that a signal received is not a valid burst.

Abstract: In a device for automatically generating an addressee number to which a short message is to be transmitted, the name of the country of the user previously stored in a user country name memory 19 is read out by a country name reader 23, and the telephone number of the addressee previously stored in an addressee telephone number memory 18 is read out by a telephone number reader 24. When the telephone number of the addressee is found to be a telephone number for a domestic call, an addressee number generator 25 adds the country code of the user's country to the telephone number of the addressee and thereby automatically generates the addressee number to which the short message is to be transmitted.

Abstract: An RF amplifier for a transmitter develops a phase modulation command representing a desired phase modulation of an RF signal, and an amplitude modulation command representing a desired amplitude modulation of the RF signal. An oscillator develops an RF input signal phase modulated based on the phase modulation command. A power amplifier receives the RF input signal and amplifies the RF input signal based on the amplitude modulation command to develop an RF output signal. A modulation control is operatively associated with the oscillator. The modulation control includes a phase memory for storing phase correction information correlating the amplitude modulation commands to a phase modulation error and a phase control for varying the phase modulation command based on the phase modulation error to correct for unintended phase errors created by amplitude modulation of the power amplifier.

Abstract: The method defines operating a telecommunication network. Application objects which are to be processed using the filter conditions in a maintenance message are selected in an exchange from a control computer. In the exchange, a central interface program uses the filter condition to select an application program in a preselection process. When the application program is executed, the application objects to be processed are then selected and processed.

Abstract: The location of a mobile station in a mobile cellular communication system is determined by taking measurements of known transmissions from the mobile station at a plurality of base stations. The serving base station sends a control message to the mobile station to induce the mobile station to transmit a known bit sequence. The known bit sequence transmitted by the mobile station is received at a plurality of base stations. The time of arrival of the known bit sequence at each base station is determined and used to calculate the location of the mobile station.

Abstract: A new use for the (already existing) fleets of commercial airline aircraft to replace low-earth orbit (LEO) communication satellites. This invention will provide low-cost, broadband wireless communication infrastructure among points-to-points accomplished by using and modifying existing, small, lightweight low power, low cost microwave relay station equipment onboard the commercial airline aircraft. Each equipped aircraft would have a broadband wireless communication link (within line-of-sight coverage ranges) to one or more neighboring aircraft or ground stations and form a chain of seamless airborne repeaters providing broadband wireless communication gateways along the entire flight path. Broadband wireless communication services also provide for customers onboard in-flight as well as customers overboard, along the line-of-sight ranges of flight path from the commercial airline aircraft.

Abstract: In a two-way paging system including a paging terminal, a plurality of paging transmitters, a plurality of paging receivers, and a plurality of two-way paging units, the plurality of two-way paging units transmitting reverse channel messages to the paging receivers in a time division multiplexed protocol, the protocol including a frame with a plurality of reverse channel time slots, a method of assigning reverse channel time slots to the paging units is disclosed. The method comprises: (a) determining a set of transmitting paging units from the plurality of two-way paging units, the set of transmitting paging units being those of the plurality of two-way paging units that are to transmit a reverse channel message; and (b) randomly assigning each of the transmitting paging units in the set of transmitting paging units one of the reverse channel time slots in the frame.

Abstract: The present invention relates to a method and an apparatus in a mobile telecommunications system for the re-establishment of a speech connection, especially one that risks being interrupted prematurely. A parameter (Q) indicating the quality of the traffic channel (TCH) on which the speech connection is implemented, is compared to a predetermined value (Q1). If the parameter (Q) is lower than said value (Q1) the speech connection (340) is parked temporarily on a dedicated control channel (DCCH) of high quality. When a traffic channel (TCH) again becomes idle (360) the speech connection is handed over (370) to this channel, which may either be associated with the base station originally serving the speech connection or another base station in the mobile telecommunications system.

Abstract: The idea of the invention is to allocate channels within a predetermined group of cells with a dynamic channel allocation method and to equalize interference caused to the cell group by connections outside the cell group e.g. through frequency or time slot hopping. Cell groups may be superimposed and they may be formed e.g. by the cells of an office system or a broad-coverage mobile communications system, by the cells of a mobile communications network of two different operators, by the cells of a network according to two different systems or by the cells of a network operated by one operator. If the cell groups are formed of cells in one network, a suitable size may be chosen for the cell group so that the computing and signalling load required by centralized dynamic channel allocation in the cell group will remain easily controllable.

Abstract: A wideband digital tuner (14′) has an analog front-end section (10), a high speed analog-to-digital converter (12), demultiplexer (13) and a plurality of filters (341-342) arranged in a parallel input architecture to process wideband digital data received at extremely high sampling rates, such as at 2 Gsps (giga-samples per second). The tuner greatly attenuates an undesired spectral half of the wide bandwidth digital spectrum of the incoming digital signal using a complex band-pass filter, such as a Hilbert Transform filter. The tuner places the remaining half of the wide bandwidth digital spectrum of the incoming digital signal at complex baseband and down samples by 2. The architecture of the tuner can be partitioned into two separate halves which are hardware copies of each other.

Abstract: A mixer (20) has a differential transistor pair (22, 24) receiving first and second reference currents at first and second nodes (30, 34). An RF signal drives the differential transistor pair. A first switching circuit (44, 46) is coupled to the first node and a second switching circuit (52, 54) is coupled to the second node. An LO signal drives the first and second switching circuits. The first and second switching circuit each have first and second outputs that are cross-coupled at output nodes (48, 50) to provide a differential IF output current representative of the sum and difference between the frequency of the RF signal and the frequency of the LO signal.

Abstract: An antenna circuit for a portable telephone is provided. The antenna circuit prevents an increase in the standing wave ratio (SWR) when the portable telephone antenna comes in contact with the human body. The antenna circuit includes: an RF (Radio Frequency) module having an impedance of about 50&OHgr;. An antenna having an impedance of about 450 to 500&OHgr; radiates an RF signal output from the RF module into the air and outputs an RF signal captured from the air to the RF module. A matching circuit connected between the RF module and the antenna matches an impedance characteristic of the RF module with an impedance characteristic of the antenna. The matching circuit includes an inductor having an inductance of about 24 mH connected between an output of the RF module and the antenna and a capacitor having a capacitance of about 1 pF connected between the antenna and a ground, the capacitor being coupled in parallel to the inductor.