Abstract: Utilizing a sequential local search optimization algorithm, a determination is made of the cell/transceiver retunes needed to implement, given a current frequency plan, a better frequency plan for a certain cellular communications system. Each of the individual cell/transceiver retunes is evaluated to determine if it meets certain save criteria, and if so, is saved as an intermediate frequency plan in a sequence of saved intermediate frequency plans necessary to migrate from the current frequency plan to the determined near-optimal frequency plan. A sequential implementation of these intermediate frequency plan revisions is then made to gradually reach, in a known and controlled manner, the better frequency plan.

Abstract: A calibration method and apparatus are described. In one embodiment, the method includes a pair of transceivers performing a loop back test to determine a relationship between transmit and receive gain for each transceiver. A path loss between the first transceiver and a second transceiver is computed. The computation is made by transmitting a pair of signals in opposite directions between the first and second transceivers to determine a relationship between transmit path gain of the first transceiver and receive path gain of the second transceiver and a relationship between the transmit path gain of the second transceiver and receive path of the first transceiver. The transmit and receive path gains are generated for the first transceivers based on the path loss and the relationship.

Abstract: A method of sending local dial tone to the subscriber from the fixed subscriber unit (FSU) is described. The method can include receiving and memorizing DTMF dialing from a connected telephone. Outpulse this DTMF dial signal information from the FSU to the network. After establishing the wireless communication between the FSU and a wireless base station, providing a cut-through of the audio path between the network and the subscriber.

Abstract: A door intercom for a dwelling, the intercom comprising a street panel and an indoor set, the street panel being provided with a call button and being connected to an electric latch fitted to a door of the dwelling, the street panel including a radio transmitter and receiver, means for recognizing a latch-opening code received by the receiver, a stand-alone electrical power supply, and means for activating the electric circuit of the latch. The street panel also includes means for controlling electricity consumption firstly to put the street panel in a standby state in which its electricity consumption is practically zero while waiting for the call button to be pressed, and secondly to put it in an active state enabling a sound link to be established with the indoor set, and enabling the electric circuit of the latch to be activated when the latch-opening code is recognized, and the means for activating the electric circuit of the latch have the necessary amount of electrical energy available.

Abstract: In a mobile radio communication apparatus, including a transmission circuit for intermittently transmitting first significant signals and a reception circuit for receiving second significant signals, a control circuit changes a strength of the first significant signals in accordance with a strength of the second significant signals only when the second significant signals are being received by the reception circuit.

Abstract: A method for operating a dual-band mobile station (10) includes a first step of (a) storing information in the mobile station. The stored information includes an ordered list of frequency bands (Band Order Table 24A). For example, at least one frequency band is an 800 MHz frequency band and at least one other frequency band is a 1900 MHz frequency band. The stored information further includes an identity (24B) of a band wherein an acceptable control channel was last located. A next step (b) is executed in response to a user invoking a search procedure to locate a new non-public system. This step accesses the memory to determine the identity of the band wherein an acceptable control channel was last located, and marks this band as a band to be searched. A next step (c) collects signal strength measurements on channels in the band to be searched and executes a channel search procedure to locate a control channel of a desired non-public system within the band to be searched.

Abstract: An overlay to an existing cellular switching structure to provide post-second generation services without the need to make modifications or updates to the existing infrastructure is disclosed. The overlay preserves second generation switching while providing post-second generation services.

Abstract: An antenna malfunction detecting system, which comprises a plurality of detectors for detecting voltage values of a standing wave, caused by a reflected wave occurring at a trouble point of an antenna system, at different detecting points, is realized for obtaining precise detection result of malfunctioning. Each wave detector for detecting voltage values of the standing wave is connected to each output of a distributor, connected to an output of a circulator which is inserted between a transmission final-stage amplifier and an antenna connector terminal, and one of then is connected via a &lgr;/4 strip line to detect voltage value of the standing wave in a different position of line equivalently. Thereby, an amplitude value of the standing wave caused by the antenna malfunction can be precisely detected.

Abstract: In a radio apparatus having a rod-like antenna (6), a cable (12) has one end electrically and mechanically connected to the antenna and is urged by a urging arrangement (22,24) so that it is prevented from slackening. The other end of the cable is fixed to an electrical part such as a circuit board (14) contained in a casing (4) of the radio apparatus. The antenna is stored in a storage portion (8) of the casing so as to be movable in a direction parallel to an extension axis of the antenna. It is preferable that the urging arrangement is constituted by a combination of a tension pulley (22) and a spring member (24) which is interposed between the tension pulley and the casing for urging the tension pulley to make said cable have tension.

Abstract: A radio communication apparatus is disclosed, that comprises a receiving portion for receiving a radio signal transmitted from a base station, the radio signal including character codes, a display portion for displaying a character string corresponding to character codes received by the receiving portion on a plurality of lines, a detecting portion for detecting a particular character from the character string displayed on the display portion, and a display controlling portion for displaying a word just after the particular character at the beginning of the next line. According to the present radio communication apparatus , a word in a message composed of a character string is prevented from being displayed in a plurality of lines. Thus, a character string is displayed on the screen of the display portion in such a manner that the user can easily read the character string.

Abstract: A receiver with suppressed intermodulation distortion for a radio communication terminal. In the receiver, a low noise amplifier for amplifying a received signal, has an operating power being increased in response to a first control signal to reduce an intermodulation distortion signal. An RF bandpass filter bandpass-filters the signals in a reception frequency band out of the signals output from the low noise amplifier. A mixer mixes an output of the RF bandpass filter with a local oscillation signal to generate an intermediate frequency signal by down-converting the output of the RF bandpass filter. An intermediate frequency amplifier for amplifying the intermediate frequency signal output from the mixer, and having an operating power being increased to reduce the intermodulation distortion signal in response to a second control signal. An intermediate frequency bandpass filter bandpass-filters an intermediate frequency signal out of the signals output from the intermediate frequency amplifier.

Abstract: Upon occurrence of any emergent state for a user, the user depresses an emergency call button of his portable telephone to transmit a signal therefrom to an emergency call center, whereby user ID and positional information of the portable telephone obtained on the basis of signals from GPS satellites are sent to the emergency call center. DGPS generates a correcting signal out of the positional information based on both the signals from the GPS satellites and the positional information of a fixed station, and then transmits such correcting signal to the emergency call center.

Abstract: A method for messaging during Inter-VLR location updates wherein a mobile station (MS) sends to a Visitor Location Register (VLR) a Location Update message having a Temporary Mobile Subscriber Identity (TMSI) number embedded therein. The VLR records the TMSI and sends to the MS a Location Update Accept message void of a TMSI number.

Abstract: Frequency synthesizers of a radio transceiver are automatically tuned so that its transmit and receive frequencies correspond to whichever upper band and lower band filters the radio transceiver has been connected by the user. A capacitive electrical impedance interface is coupled to filter circuitry of an upper band filter section, while an inductive electrical impedance interface is coupled to filter circuitry of the lower based filter section. A voltage reference circuit is coupled to one of the transmit port and the receive port of the transceiver. A controller is operative to automatically tune the transceiver to transmit in one of the upper and lower frequency bands, and to receive on the other frequency band, in accordance with the voltage level generated by the voltage reference circuit.

Abstract: A system and method of providing preferential access to a cellular telecommunications network to a localized service area (LSA) subscriber who subscribes to a LSA and is operating a mobile station (MS) within the LSA. The cells which are included in the LSA are defined in a base station controller (BSC). The LSA subscriber's subscription information in the home location register (HLR) identifies any LSAs to which the subscriber subscribes. A Preferential Priority Indicator (PPI) property may also be set for the MS in the HLR. The PPI property indicates that the MS is to be granted preferential access whenever the PPI property is set. A Preferential Priority Network Indicator (PPN) property is also set in the BSC that indicates that the BSC supports use of the PPI property whenever the PPN property is set. When the MS originates a call, the BSC derives a second LSA-ID from the Cell-ID for the cell where the call originated.

Abstract: There is described a stabilization process for the local oscillator frequency in wide-band tunable DROs employed in receivers of a digital microwave radio link. A microprocessor, already provided for normal operation control, cyclically reads the control voltage of a VCO inserted in PLL which reconstructs an intermediate frequency carrier used to coherently demodulate the received signal. The voltage read is compared with an optimal reference value by taking an error signal which controls a varicap diode of the DRO for tuning correction. With each reading, the optimal value can be modified on the basis of temperature data supplied by a heat sensor to cancel the effect of temperature on the reference.

Abstract: The invention concerns a communications system including at least one transmit antenna near at least one receive antenna, transmission producing signals in the receive frequency band. The system includes a transmit neutralizing circuit for supplying a correction signal for eliminating only interfering signals whose frequency is in the receive signal frequency band. The transmit neutralizing circuit is on the input side of an amplifier and comprises means for evaluating, in the wanted receive frequency band, a limited number of parameters of the power amplifier feeding the transmit antenna, this evaluation of parameters being effected on the basis of the input and output signals of the amplifier. The circuit also evaluates the signals causing the interference prior to the input of the amplifier; this evaluation of the interfering signals is based on the calculated parameters and the signal at the input of the amplifier. Application to transmission systems on ships or spacecraft.

Abstract: Link performance is measured in a code division multiple access (CDMA) personal communication service (PCS) or cellular system, or other type of wireless system, using a test set-up which permits the simulation of various changes in system configuration. An illustrative embodiment includes a first attenuator arranged in a common portion of a receive path and a transmit path of a mobile station of the system, and a second attenuator arranged in either a receive-only portion of the receive path or a transmit-only portion of the transmit path. The amounts of attenuation provided by the first and second attenuators are decoupled such that a different amount of attenuation can be provided on the transmit path than on the receive path. Performance of forward and reverse links of the system are measured while varying a value of at least one of the first or second attenuators.

Abstract: An RF direct down-conversion topology that is insensitive to leakage and device mismatching is presented. According to the system the RF signal is split into two arms with each arm having a mixer. Each mixer has two inputs namely a phase modulated local oscillator signal and the RF information signal. The phase modulated local oscillator signal between each arm differs by a 90 degrees phase shift. The output of the mixers is subtracted and the output of the subtractor is mixed with the phase modulation signal. The output of the third mixer represents the base band. A low pass filter then removes the unwanted signals.

Abstract: A telephone is disclosed having a memory which stores a full menu and a customization unit which customizes the full menu to form a custom menu. The customization unit includes a masking device which masks selected items of the full menu to form the custom menu. A screen displays the custom menu. A keyboard has a key which manually controls the masking device. Further, a counter counts the number of times items of the full menu are accessed by a user to determine the selected items. In particular, the selected items are the least frequently accessed elements of the menu by the user. The counter controls the masking device to mask the selected items.