Abstract: A method and apparatus for transmitting in multiple radio frequency (RF) bands from a single device is described. The device includes a transmitter (128) for transmitting RF communication signals. The transmitter is comprised of a power amplifier (200) for amplifying the RF communication signal in either a first RF band or a second RF band. The transmitter has a complex transformer (202) for partially transforming the impedance of the RF communication signal in a first RF band, and completely transforming the impedance of the RF communication signal to the characteristic impedance in a second RF band. The transmitter also includes a first path (204) for transmitting the RF communication signal in the first RF band and a second path (206) for transmitting the RF communication signal in the second RF band.

Abstract: A differential ring oscillator is provided with three differential amplifiers and provides three-phase output signals which can be used for synchronous detection of a received multi-phase modulated signal in a multi-phase receiver, wherein the phase of the local oscillator signals may be in other-than-quadrature relation. Two of the phase outputs of the local oscillator can be combined to provide a signal that is in quadrature with the remaining output. The oscillator is preferably controlled in coarse frequency control steps and using a fine voltage control signal responsive to a phase-locked loop to reduce frequency modulation of the oscillator signal arising out of leakage signals.

Abstract: The present invention sets forth group call services which uses broadcast or point-to-point radiocommunication resources to provide information to a mobile station user. First, indications of existing group calls are transmitted to mobile stations. Then, users of mobile stations are alerted to the existence of relevant group calls, i.e., those calls in which they are eligible to participate.

Abstract: An apparatus and method, in a telecommunications network having a first and a second system, for activating and deactivating call forwarding from a dual mode subscriber station's number in the second system to the subscriber station's number in the first system. A first message is transmitted upon initiation of communication between the subscriber station and the first system. If it is determined that a data field in the first message is in the first state, call forwarding from the subscriber number of the second system to the subscriber number of the first system is activated. If the data field is in a second state, call forwarding from the subscriber number of the second system to the subscriber number of the first system is not activated. An indication of at least one type of selected subsequent event, upon which the user of the subscriber station desires to deactivate the call forwarding may also be included in the first message.

Abstract: A controller in a communication device receives a request, from a process operating in the communication device, to subscribe to a data routing service that is managed by the controller. In response to the request, the controller assigns a destination identifier to the process and adds the process and the assigned destination identifier to a routing table that is stored in a memory associated with the controller. Data subsequently received from a data source is routed to the process or to one of multiple communication ports by the controller by reference to the destination identifier, or the absence of a destination identifier, stored in the routing table.

Abstract: The mobile phone switchboard is a central unit, which operates as a mobile phone which is attached to other internal units 1, 2, 3, . . . 9 or more. It is similar to the usual mobile phone handsets and it is equipped with 4 illuminating lights (Inq., Tran., I, II). With the mobile phone switchboard it becomes possible to third party to operate mobile phones. (such as disabled people or even more children and so on), with controlled operation costs. At anytime parents are able to communicate with their children and vice versa, with controlled cost via the central unit. Additionally the mobile phone switchboard has the following specifications: 1. Modification of the central unit to operate in Direct Inward Dialing (D.I.D.) for higher benefit of the mobile phone network. 2. Call transfer to other telephone units/numbers. 3. Simultaneous conversation with several calls.

Abstract: The invention concerns a telecommunications system in which the Earth is divided into areas (26) within which communications are effected by means of transmit and receive means on a spacecraft, such as a satellite, allocated to communication for a plurality of areas. Areas (2610, 2611, 2612) of a first category (28) are allocated signals having respective polarizations (PD, PG) and carrier frequencies (&Dgr;F1, &Dgr;F2) such that two adjacent areas of the first category are allocated signals having different polarizations or carrier frequencies. Each area of a second category (30) is allocated signals having all the available polarizations and all the available carrier frequencies.

Abstract: A system and method calibrates the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal. The system generates a plurality of test data points. Each data point includes a test input signal magnitude and the corresponding parameter value which, when applied by the device, produces the correct output level for an input having the test magnitude. The data points are generated by a calibration control system which sets the test signal magnitude and then adjusts the parameter value until the correct output level is detected. The test data points are analyzed to determine the value for coefficients of an equation of predetermined form that defines a curve that substantially follows a plot of said plurality of test data points. The coefficients are stored in the electronic device.

Abstract: The present disclosure describes a receptacle for acoustically guiding tones emitted from the side of the transducer. The receptacle is adapted to be mounted onto an acoustic transducer within a housing for acoustically sealing and guiding sound from the transducer. The receptacle has a depression on the bottom surface adapted for mating with and sealing the acoustic transducer.

Abstract: For a hierarchical mobile cellular communications system comprising a plurality of microcells and overlaid macrocells, a method is disclosed for estimating the speed of a mobile. The speed estimate assists in the assignment of slow-moving mobiles to microcells and fast-moving mobiles to macrocells, thus keeping the cellular system in optimum utilization. The method first calculates a power signal of the received signals. The power signal is then filtered and decimated. The speed of a mobile is estimated from a determination of the offset autocorrelation of the filtered and decimated power signal.

Abstract: A system for reducing wireless telecommunications network resources required to successfully route calls to a wireline network of the present invention. A first mechanism routes a call originated from a wireless party connected to a wireless network to a wireline party connected to a wireline network. A second mechanism determines if the wireline network is congested in response to the mechanism for routing and provides a signal in response thereto. A third mechanism selectively queues the call in response to the signal. A fourth mechanism connects the wireless party to the wireline party when the call reaches a front of the queue and the wireline network can accept the call. In a specific embodiment, the first mechanism for routing the call includes a mobile switching center in communication with a base station or base station controller. The base station or base station controller communicates with a mobile station associated with the wireless party.

Abstract: Performing an antenna diversity set-up according to the present invention a first mobile terminal (1) transmits a pre-defined antenna calibration signal to a second mobile terminal (15) using its omni-directional antenna (10). During the period of the transmitted signal the best receiving antenna (x) is identified at the second mobile terminal (15) by switching all its directional antennas (21 to 28) and its omni-directional antenna (20) into its receiving path and measuring the received signal quality, e.g. the received signal strength. The directional antenna (x) of the second network device (15) which is identified as best receiving antenna is then used for transmission and reception of data transfer with the first network device (1).

Abstract: A computer cellular communication system is provided including a computer having a communication jack adapted for being releasably connected to a hard line communication network and a motherboard mounted within the computer. The motherboard has mounted thereon read only memory, random access memory, and a central processing unit connected to the read only memory and the random access memory. Also included is a cellular communication module mounted directly on the motherboard and including a cellular transmitter for transmitting data in free space and a cellular receiver connected to the first communication jack of the portable computer for receiving data in free space. The cellular communication module further includes a first modem connected to the cellular transmitter and the cellular receiver for communicating data therewith. The first modem generates a receive signal upon the receipt of a call signal via free space having a predetermined associated cellular telephone number.

Abstract: An apparatus and method for controlling the volume of a device's user alert sound based on an analysis of the device's environment. The device emits a signal and receives a resulting reflected signal. A processor measures characteristics such as the amplitude and/or delay of the reflected signal to determine the type of environment in which the communication device is located. The volume of the alert sound is then adjusted based on the type of environment indicated by the characteristics of the reflected signal. For example, if the characteristics indicate a closed environment, such as a briefcase, the volume is adjusted to high level, and if the characteristics indicate an open environment such as a desktop, the volume is adjusted to a low level.

Abstract: A base station for a radio communication system is provided, particularly for a mobile radio network. The base station contains at least two transceivers and at least one antenna for the radio-technical supply of communication connections to at least one remote station. A controller of the base station performs monitoring and organization of the transceivers means such that one of these transceivers means is switched into energy saving mode as soon as it does not supply any communication connections.

Abstract: A system, method, and program for selecting an antenna from a plurality of antennas in a wireless communication system having a dynamic frequency range is disclosed. This disclosure describes how a singular quality indicator derived from a plurality of quality parameters improves diversity selections in uplink or downlink channels integrated in time or separated in frequency. The quality indicator is derived in part from a synchronization, a cyclical redundancy check, and a differential receive signal strength indicator process. The processes modify a quality indicator when a sync error, a cyclical redundancy check error, or one of a number of receive signal strength conditions is detected. When a predetermined quality threshold exceeds the quality indicator at any point in time antenna selection occurs.

Abstract: A mobile radio communication device for performing communication with a base station comprises an interference detection measure for detecting occurrence of interference to the downlink frequency and/or the uplink frequency, and an interference informing measure for transmitting information about the occurrence of the interference to the base station. The base station which received the information about the interference assigns the mobile radio communication device new time slots or a new communication carrier frequency. The mobile radio communication device has a transmission system and two reception systems which are composing a post-detection selective space diversity system, and each of the two reception systems is composed of a double superheterodyne system, in the same way as general conventional mobile radio communication devices.

Abstract: A bidirectional signal transmission system of the present invention includes a first transceiver, a second transceiver, and a transmission line connecting the first transceiver and the second transceiver with each other, in which the first transceiver transmits a first signal to the second transceiver while the second transceiver simultaneously transmits a second signal to the first transceiver. The first transceiver includes: a first constant current circuit out of which a current flows, the current having a level which changes according to a logical level of the first signal; and a first current difference compensation circuit for compensating for a difference between the current flowing out of the first constant current circuit and a current flowing along the transmission line.

Abstract: A radio base station having a plurality of directional sector antennas for providing communications with outstations lying at different azimuth angles to the base station is disclosed in which the antennas transmit signals using one or both of two orthogonal polarizations such as left hand or right hand circular antennas and polarization and which also measures interference levels on different frequency channels that are used for allocating an optimum channel and polarization for connecting a call. Each of the outstations comprise at least one antenna of selectable polarization.

Abstract: The present invention relates to a method and an arrangement for finding information in a communications system comprising a circuit switched network, a packet switched network and a link therebetween. A user related location information is obtained by the circuit switched network and the packet switched network is subsequently utilized using said location information for finding the desired information. The invention relates further to a mobile station to be used in accordance with the invention.