Abstract: The invention is a method and a network which provides mobile terminals (12) with the address of and access to application services. A network in accordance with the invention includes a plurality of mobile terminals which transmit and receive information transmitted through the network (100, 200); at least one storage (52), coupled to the network, which is accessible by the plurality of mobile terminals that provides services to the mobile terminals; and a directory storage (102), coupled to the plurality of mobile terminals, which stores addresses of the at least one storage and which provides in response to a communication at least one address of the at least one storage to at least one of the mobile terminals with which the plurality of terminals may communicate to obtain service therefrom.

Abstract: A car radio system includes a car radio and at least two speakers connected to the car radio. The system can be used by only some of the vehicle occupants without disturbing the other occupants by providing at least one of the speakers with a jack for connecting a headset plug and with a switch that can be used to deactivate playback via the speakers.

Abstract: Variations in received signal amplitude caused by filter characteristics are reduced by a C/I measuring apparatus for a signal having a fluctuating carrier-frequency, comprising a filter for filtering the signal and means for splitting the signal into an RSS signal representing the signal strength and a BB signal representing the momentary carrier frequency deviation, comprising means for measuring the RSS signal unaffected by the frequency dependent attenuation in the IF filter. A method of measuring the C/I of a received signal is also disclosed. The method comprises the steps of filtering the signal using an IF filter to obtain one signal channel, feeding the signal to the FM detector and the RSSI unit, and measuring the signal strength of the received signal at a selected, substantially constant, carrier frequency.

Abstract: A method and apparatus in a communications system for handling overload conditions in a cell. Mobile assisted channel allocation information is used to identify an adjacent channel for use in directing a mobile station. The communications system monitors for attempts by the mobile station to access a first cell in an overloaded state. When such an access is detected, information is obtained for cells adjacent to the first cell. A second cell is identified from the cells adjacent to the first cell using the mobile assisted channel allocation information and a message is sent to the mobile station to access the second cell.

Abstract: The invention pertains to a method and an arrangement for linearizing a radio receiver (20). The invention is advantageously applied in the reception circuits of mobile stations. A receiver according to the invention monitors the signal strength on the receive channel and its neighboring channels. In addition, the receiver can determine the quality of the detected signal by calculating its bit error ratio or signal-to-noise ratio. In normal conditions, i.e. when the signal strength is satisfactory on the receive channel and normal on the neighboring channels, the supply currents of the front-end amplifiers (A1, A2) and at least the first mixer (M1) of the receiver are kept relatively small. If the signal strength on the receive channel goes below a predetermined value or, on a neighboring channel, exceeds a predetermined value, said supply currents are increased. This may happen also if the bit error ratio or signal-to-noise ratio reaches a predetermined limit.

Abstract: The present invention relates to radio communication antennas and in particular relates to multi-user detection for CDMA antenna array receivers. A reverse link (mobile to base) of a cellular direct sequence code division multiple access system is provided which increases system capacity whilst avoiding system complexity. The invention provides a method of signal detection which is based on the partitioning of users into equivalence classes by beam-forming with subsequent standard multi-user detection techniques applied within each class. Computation techniques are simplified and processing time can be considerably reduced. Furthermore, the capacity of a conventional receiver may be improved by employing multi-user detection techniques. These techniques are particularly useful for systems which involve large numbers of users. A method of operation is also disclosed.

Abstract: A wireless local loop system including wireless base stations each provided with a detecting part for detecting a fault between it and a wireless base station controller and a part, when detecting a fault by the detecting means, for adding blocking information to broadcast information and sending the same. The wireless local loop system further including wireless subscriber units, for setting up wireless links with the wireless base stations, each provided with a switching part, when receiving and recognizing the blocking information, for switching the setting of the stand-by station to a wireless base station of a nearby area, whereby a new stand-by station is established by a wireless base station which is able to start communication through a wireless link by the blocking information of the occurrence of a fault, which blocking information can be received since the reception level does not fall or the link is not disconnected.

Abstract: The ultra-wideband communication system includes a transceiver configured to receive an ultra-wideband communication signal, which has embedded power level data. A measurement circuit in the transceiver measures the strength of the received signal. An attenuation factor is computed that compares the measured signal strength to the data embedded in the signal. A feedback circuit uses the attenuation factor to select a power level for a next transmission. In a preferred configuration, the transceiver also has a positioning circuit that is used to accurately determine the distance from the transceiver to the source of the communication signal, and the feedback circuit uses the distance to tune the power level for the next transmission. In another preferred configuration, a bit error rate is used to set power level for the next transmission.

Abstract: A DC offset correction circuit (68) provides DC offset correction within a receiver (50) for receiving and processing a radio frequency signal (28) within a radio communication system (30). The DC offset correction circuit (68) includes a feedback loop (88) for shifting a digital signal (80) by a programmable amount; and a coarse DC offset correction path (104) coupled to the feedback loop (88) for performing coarse DC offset correction.

Abstract: A method of managing a plurality of radio links in a WLL (Wireless Local Loop) is provided. The state of each radio link are defined as L2_NewLid indicating establishment of the radio link is requested but not completed, LNK indicating that a new connection is established to the radio link, and L3_AddReq indicating establishment of the radio link is pending. A data link layer of a base station manages each radio link between a terminal and the base station referring to the state of the radio link. Upon request for establishing a radio link, the data link layer sets the LNK of the radio link to 1. Upon request for releasing the radio link, the data link layer sets the LNK of the radio link to 0. Upon request for adding a radio link, the data link layer adds the radio link by checking the L2_NewLid and the LNK of the radio link.

Abstract: Communications network architectures integrate communications using a geosynchronous satellite communications system including a geosynchronous communications satellite operating in the fixed satellite service (FSS) band and a low earth orbit satellite communications system including a plurality of low earth orbit communications satellites. A low earth orbit gateway having a terminal is used to communicate with the low earth orbit communications satellites using multiple access communication channels, and is used to communicate with a public switch telephone network. A geosynchronous gateway having a terminal is used to communicate with the geosynchronous communications satellite by overlaying multiple access communication channels onto fixed channel assignments and transmitting the overlayed channel assignments. The terminal in the geosynchronous gateway is also used to communicate with the public switch telephone network.

Abstract: The present invention regards method and apparatus relating to wireless office system. The present invention addresses the problem of enabling it to be determined in the wireless office system (5) when voice mail messages for users of mobile stations having subscriptions in the wireless office system (5) are received at the voice mail system (15), the voice mail system (15) being associated with but not included in the wireless office system (5). The duration(s) of greeting message(s) associated with the voice mail system (15) and the or each mobile station having an associated voice mailbox (16b1-16bM) in the voice mail system (15) is/are measured. The connection times to the voice mail system (15) are measured when calls for the mobile stations are forwarded to the voice mail system (15) from the wireless office system (5). By comparing the duration(s) of the greeting message(s) with the measured connection times, it is determined whether voice mail messages have been received.

Abstract: Closed-loop transmitting power control method is disclosed that employs a variable updating amount. At a receiver, the presence or absence of frame errors in a received signal from a transmitter is determined using CRC coding. If frame errors do not occur, a downward updating amount, which is an updating amount for lowering a reference value, is set according to the magnitude of the reference Eb/I0 value, the reference Eb/I0 value is lowered by this downward updating amount, and an error incidence flag is turned OFF. If frame errors are detected, an upward updating amount, which is an updating amount for raising the reference value, is set according to the logical state of the error incidence flag, the reference Eb/I0 value is raised by the upward updating amount, and the error incidence flag is turned ON.

Abstract: An output power detecting circuit of transmitter, comprises a signal detecting unit connected between the transmitter output end and the transmitter control unit to detect an output signal of transmitter, a reference voltage generating unit, a differential amplifier having non-inverted input end, inverted input end and output end to supply a detection voltage to the control unit from the output end and a voltage limiting element connected between the inverted input end and reference potential point, wherein the detection voltage output from the signal detecting unit is supplied to the non-inverted input end, the reference voltage output from the reference voltage generating unit and an additional reference voltage of the transmitting level indicating voltage output from the control unit are respectively supplied to the inverted input end, the additional reference voltage supplied to the inverted input end is limited with the voltage limiting element and the detection voltage increasing with increase of the de

Abstract: Disclosed is a method for synchronizing a radio port and a radio interface unit (RIU) in a WLL system, in which an asynchronous system is used for communication among radio ports, capable of providing timing synchronization between each radio port and each RIU associated therewith. The method involves the steps of controlling a modulator equipped in the radio port to execute an internal timing alignment thereof, controlling a channel card controller equipped in the radio port to execute the timing alignment with the modulator, controlling the channel card controller to transmit the synchronous data to the radio interface unit via the modulator, controlling the radio interface unit to acquire a pilot signal transmitted from the radio port, and synchronizing the radio interface unit with the radio port associated with the acquired pilot signal based on the synchronous data received from the radio port.

Abstract: This system is for automatically controlling a radio receiver to provide an audible broadcast of the weather alert from weather stations. It may also be incorporated in a multi-band radio for automatically switching between AM/FM broadcast and weather alert broadcast. A scanning means operates continuously to tune the weather band portion of the receiver automatically in a stepping manner to receive signals from the weather stations regardless of whether the receiver is operating in any selected AM or FM broadcasting in the multi-band radio. A combination switching comparator and switching means automatically switch the system over to the weather broadcast when a weather alert signal is detected. The switching means also automatically switches the system back to the original selected broadcast after the termination of the weather alert broadcast.

Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.

Abstract: The invention provides the possibility of reducing the size of a mobile phone (1) by reducing the key set (7, 11, 12, 13). The invention provides a system and a method for mobile radio transmission by means of a mobile unit (1) which, for setting up a connection, has only one or more direct connection keys (7, 11, 12, 13), the initial activation of which in each case sets up a connection to a destination location assigned to one of the respective direct connection keys (7, 11, 12, 13). By activation of a central key (7) of the mobile unit (1), a connection (33) from the mobile unit (1) to a central switching device (30) is set up.

Abstract: A system and method for temporary or permanent disabling of a cellular control device is described. A cellular control module is responsive to either a temporary disable command or a factory disable command received over a cellular control channel. The cellular control module is responsive to an enable command received over the cellular control channel if the cellular control module was previously temporarily disabled by a temporary disable command. The cellular control module includes disable logic to respond to a temporary disable command, and disable logic to respond toga factory disable command.

Abstract: A grounded, shielded holder for a radio frequency communications card installed in a terminal used in a wireless network includes a built-in antenna for transmitting and receiving radio frequency signals to and from the card. The antenna is formed from the material of the holder itself.