Abstract: A system to determine the length of time, known as the latency time, that is required to wait between transmitting and receiving data for a half-duplex electromagnetic transceiver having a transmitter and receiver wherein the receiver is electromagnetically coupled to the transmitter. The determination of the latency time is accomplished by the use of a control circuit that operates to turn the transmitter to an on state. The control circuit then monitors the receiver to determine when the receiver also goes to an on state due to the electromagnetic coupling. The control circuit subsequently turns off the transmitter and the length of time for the receiver to recover to an off state is measured. This length of time is the latency time and is used in subsequent transmission of data.

Abstract: A radio receiver with an integrated telephone device (1) is proposed, which is used for switching of loudspeakers (20, 21, 22, 23) between radio reception and telephone reception. In the telephone mode the loudspeakers (20, . . . , 23), which can be connected to the radio receiver, are switched to telephone reception, and when a preset signal is received by the radio receiver, preferably an information signal for traffic reports which has been modulated on a 57 kHz auxiliary carrier, the loudspeakers (20, . . . , 23) are partially switched over to radio reception. In the radio reception mode the loudspeakers (20, . . . 23), which can be connected to the radio receiver, are switched to radio reception, and in case of a loop allocation in the telephone device (1) for receiving an incoming and/or outgoing call, the loudspeakers (20, . . . , 23) are at least partially switched over to telephone reception. Switching of the loudspeakers (20, . . .

Abstract: Apparatus, method and system for notifying a communications switching center that a subsequent communication directed to a wireless number associated with the wireless unit is to be routed to a directory number associated with the wireless unit. A converter may be provided and connected to a current source and to a communications switching center. The wireless unit may be connected to the converter, and if connected, the unit draws current therefrom. In response to the draw of current by the wireless unit through the converter, the converter transmits a message to the communications switching center. The message includes a notification that a subsequent communication directed to the wireless number associated with the wireless unit is to be routed to the directory number associated with the wireless unit.

Abstract: A system and method of providing a terminator telecommunications unit with the geographic location of a mobile telecommunications unit, where the terminator unit may then provide directions to the mobile unit in voice format or non-voice data format so the mobile unit can use the directions to arrive at the location of the terminator unit.

Abstract: In a mobile cellular communication system, adjacent basestations BS1-BS4 are assigned different selections of different frequency channels to communicate with mobiles in their cells (10, etc.). To improve system quality and capacity, a basestation selects a frequency channel which is not assigned to it or any neighbour station, and makes test communications on that frequency channel with mobiles (e.g. MS1) in its cell. The basestation assesses the potential performance of that frequency channel, and neighbour basestations can monitor for potential interference on that frequency channel. The information so gathered can be analysed by an operations maintenance station OMC.

Abstract: In a radio telecommunications network, a system and method of informing a called mobile station operating in a visited mobile switching center (V-MSC) that an incoming call is a collect call prior to delivering the incoming call to the mobile station. The system obtains in an originating mobile switching center (O-MSC), a collect call prefix from a calling party and determines from the collect call prefix that the incoming call is a collect call. A collect call indication (CCI) is generated and sent along with the calling number to the V-MSC in a Location Request (LocReq) Invoke message and a Routing Request (RoutReq) Invoke message, thereby notifying the V-MSC that there is an incoming call for the mobile station and the incoming call is a collect call. The V-MSC sets a collect call flag to ON, stores the calling number in a subscriber record in the V-MSC, and determines whether the mobile station is a digital mobile station.

Abstract: The capacitance value of a variable capacitance element of an RF tuning circuit is controlled in accordance with a control signal Vx. When an automatic search start signal is supplied to a frequency control circuit, frequencies of the local oscillation signal are changed and received frequencies are changed. A storage circuit stores the control data for each predetermined frequency corresponding to the frequency characteristic of the tuning element. When local oscillation frequencies are changed in accordance with an automatic search start signal, an arithmetic circuit computes a control signal Vx in accordance with the data corresponding to the changed received frequency and the control data and thereby, the variable capacitance element is controlled in accordance with the control signal Vx and tuning frequencies are changed so that a tuning frequency coincides with a received frequency.

Abstract: According to exemplary embodiments of the present invention, non-uniform helical antennas are described for use in two or more frequency hyperbands. For example, non-uniform helical antennas can be designed according to the present invention for usage in portable terminals capable of operating both at 800 MHz and at 1900 MHz. Tuning to both resonance frequencies can be accomplished by varying parameters of the helical antennas including, for example, the pitch angle, coil diameter, length and number and spacing of the coil turns.

Abstract: An off-channel leakage power monitor implemented in a transceiver (100) dynamically measures adjacent and alternate channel leakage power produced by nonlinearities in a transmitter (110) power amplifier (116). A main local oscillator (124), offset voltage-controlled oscillator (122), and second local oscillator (170) are adjusted to obtain on-channel power, adjacent channel power, and alternate channel power measurements using a measurement calculator (185) implemented in a digital signal processor (180) or as a gate array in a receiver (140). Once the off-channel leakage power measurements have been obtained, any number of techniques can be used to extract increased efficiency from the power amplifier (116) while maintaining acceptable linearity under changing operating conditions.

Abstract: An improved system and method for high penetration notification is disclosed. Whereas conventional telecommunications systems invoke wireline trunking resources to transfer calling number information to the transmitter for wireless transmission to a called subscriber, the system and method of the present invention avoids allocation of the trunking resources by incorporating the calling number information into existing non-trunked information transference protocols.

Abstract: A radio communication analyzer can test a radio device under test which corresponds to one of a plurality of types of digital communication systems in accordance with the digital communication system to which the radio device under test corresponds. The radio communication analyzer includes a modulation section, a demodulation section, a modulation/demodulation processing section, and a control section. The modulation section has a first rewritable memory, and converts modulation data indicating the contents of a first test signal to be transmitted to the radio device under test into a digital modulated signal by executing a program written in the first memory. The demodulation section has a second rewritable memory, and generates demodulated data from a second test signal received from the radio device under test by executing a program written in the second memory. The modulation/demodulation processing section has a third memory.

Abstract: Reliable and comprehensive calling party identification services are provided to mobile subscribers. Calling party identification information, including for example public and private telephone numbers, is sent to a mobile database in a called party mobile network as part of an interrogation procedure for obtaining routing information for routing that call to the mobile subscriber in the PLMN. The mobile database then sends the calling party identification to a mobile switching center where the called mobile station is currently registered and being served as part of that interrogation procedure. The serving mobile switching center stores that calling party identification together with a roaming number allocated for the call. When the call is routed to the serving mobile switching center, the stored calling party identification is forwarded to the mobile unit along with call setup information and is ultimately presented to the mobile unit subscriber.

Abstract: In a selective calling communication system, the number of times a paging signal is transmitted and a paging signal transmission interval can be changed in response to a request of a calling party, and the paging signal is transmitted the changed number of times and/or at changed intervals, so that the paging signal can be received at a higher probability than before, thus making it possible to realize a selective calling communication system which can improve the reliability of reception as compared with conventional systems.

Abstract: The telecommunications networks of the present invention include a wireless enhanced service platform which is coupled to a home location register database and a prepaid platform. The telecommunications networks of the present invention may also include a mobile switching center for accepting calls from a wireless handset, an interexchange network that carries calls to the prepaid platform, and a local network for terminating calls.The present invention also includes a method for setting up a call in a telecommunications network comprising sending transaction capabilities application part messages containing prepaid parameters between a wireless enhanced service platform and a prepaid platform. The prepaid parameters are the information needed to process and bill a debit call. The present invention also includes a method for sending transaction capabilities application part messages containing prepaid parameters between a mobile switching center and a prepaid platform.

Abstract: Cellular communication systems (20) use repeaters (50) to communicate with subscriber units (24) otherwise shadowed from base stations (22). A networked repeater (50) is provided for use in a cellular communication system with low-earth orbit satellites (22) and mobile subscriber units (24). Networked repeater (50) includes a base transceiver module (54) for communicating with the base stations (22) and a plurality of subscriber transceiver modules (56), each of which communicates with subscriber units (24). The base transceiver module (54) is located so as to be unshadowed, i.e. able to have unimpeded communication with at least one of the satellites (22). The subscriber transceiver module (56) is located so as to provide unshadowed communication with the subscriber units (24) that would otherwise be shadowed, i.e. unable to have unimpeded communication with any of the satellites (22).

Abstract: A method for service acquisition after call release in a dual mode mobile telephone relies upon protocol versions data stored in the mobile telephone to determine whether a digital control channel is available. Each time the mobile telephone is assigned by the base station to a new traffic channel, whether during call establishment or during a hand-off, the mobile telephone stores protocol version data which is broadcast on the newly assigned channel. After a call release, the mobile telephone uses the stored protocol version data to determine whether a digital control channel is available in the channel band occupied by the last used communications channel. If no digital control channel is available, the mobile station will scan for a suitable analog control channel and acquire service immediately on the analog control channel without waiting for a pointer to a digital control channel.

Abstract: A broadcast receiving system for use with an FM radio transmitter in a vehicle includes an adapter unit and an antenna unit. The adapter unit includes a connector to a vehicle's existing power system, e.g., cigarette lighter receptacle. The adapter unit receives audio program signals from the antenna unit, and retransmits them to a vacant FM channel or to an intermediate frequency channel of the vehicle's FM radio receiver. The antenna unit receives radio broadcast signals having frequencies in the range of about 300 MHZ to about 4000 MHz from satellites and terrestrial repeaters.

Abstract: A method of balancing availability of uplink (102) and downlink (101) frequency bandwidths includes determining a demand level for use of downlink (101) frequency bandwidth, and occupying artificially a portion of uplink (102) frequency bandwidth based on the demand level to balance the availability of the uplink (102) and downlink (101) frequency bandwidths. Occupying artificially a portion of uplink (102) frequency bandwidth includes limiting access to a plurality of uplink time slots in uplink (102) communication. Failure to receive a demand for originating a call on uplink (102) communication or a demand by at least one of a plurality of mobile stations to terminate its uplink (102) communication triggers occupying artificially a portion of uplink (102) frequency bandwidth.

Abstract: A diversity reception system for use in narrow-band radio frequency communication systems includes a plurality of receivers that each generate a detected signal from a received radio frequency signal. The diversity reception system switches between receivers to output a high quality audio signal. The system selects a receiver having the highest quality reception at any given time by using a detected signal having the highest relative signal-to-noise ratio when the detected signals have less than a preselected threshold signal-to-noise ratio and a detected signal having the highest relative signal strength when one or more of the receivers is generating a detected signal having a signal-to-noise ratio at or above the preselected threshold signal-to-noise ratio.

Abstract: A wireless telecommunications system and method for basing the voice coder selection for the speech channel on the current location of the subscriber. Subscribers having a voice coder of less quality, such as a half-rate voice coder, can specify that while making or receiving calls in certain locations, e.g., from home or from the office, an improved voice coder should be allocated, such as the enhanced full rate voice coder. The location based voice coder selection can be implemented in either the mobile station itself or within the cellular network.