Abstract: The method includes deriving all receiver carrier frequencies and all transmitter carrier frequencies of the base station from a common reference frequency; comparing a transmitter carrier frequency of a subscriber station with a receiver carrier frequency in the base station to obtain an average frequency deviation; transmitting the average frequency deviation to the concerned subscriber station; adjusting the transmitter carrier frequency of the subscriber station so that the frequency deviation is minimized; when data is to be transmitted with other carrier frequencies, switching from the receiver channel and transmitter channel to other channels; and prior to switching deriving new transmitter and receiver carrier frequencies (TMTx2, TMRx2) of the subscriber station according to the following formulae: TMTx2={1/C}[BSRx2+ZFLOBS(m′−n·C)+RFLOBS(1−R)], TMRx2={1/C}[BSTx2+ZFLOBS(m−n′·C)+RFLOBS(1&mi

Abstract: A receiver which includes a control circuit (7) for delivering encoded messages, derived from a radio signal, to at least one storage device (12, 28), for receiving control data, derived from the encoded messages, from at least one storage device (12, 28), and for forming a speech text for an audio circuit (69) and a display text for a display device (13) from the control data. In order to achieve an acceptable speech text quality, a speech segment memory (14) for storing predetermined speech segments of at least one language is coupled to the control circuit (7). The control circuit (7) forms a speech text with at least a part of the message for which speech segments are stored in the speech segment memory (14). The control circuit (7) is also arranged to form a display text with at least all parts of the message which are not contained in the speech text and for which no speech segments are present in the speech segment memory (14).

Abstract: A communication device receives control information during transmission of streaming data, such as speech data, over a wireless channel (300). The communication device identifies a portion of the streaming data, such as representing a pause in speech, as compressible data or white space data (310, 320). Continuous transmission of the streaming data is interrupted to request and receive control information on the wireless channel, using the channel space made available by not transmitting the identified portion of data or by transmitting it in a more compressed format (330, 340).

Abstract: A mobile communication terminal device of the present invention includes: a voltage detector for detecting a battery voltage at the time of a voltage drop; a correction phase storage section for storing pieces of correction phase information each having a characteristic opposite to that of a phase error in a carrier wave produced due to a drop in the battery voltage; a correction phase outputting section for selecting correction phase information based on the battery voltage at the time of the voltage drop and outputting the selected correction phase information to a baseband modulator to change phase information in a baseband signal; and a modulator for modulating a carrier wave according to the baseband signal output from the correction phase outputting section so as to cancel the phase error included in the carrier wave.

Abstract: A radiotelephone includes a housing, and a radiotelephone communications transceiver and display are attached to the housing. A contact-sensitive transducer such as a resistive transducer, a capacitive transducer or a semiconductive transducer, is attached to the housing and produces an output signal that characterizes contact with a contact-sensitive surface of the contact-sensitive transducer. A controller is responsive to the output signal and operatively associated with the display and the radiotelephone communications transceiver, and controls at least one of the display and the radiotelephone communications transceiver according to the output signal of the contact-sensitive transducer. The controller, responsive to the contact-sensitive transducer, may determine a position of contact along an axis of the contact-sensitive transducer. A graphical object is selectively displayed based on the determined position of contact to thereby identify the graphical object, e.g.

Abstract: A conventional portable cellular phone modified such that the phone housing incorporates a digital cameras security alarm system and other functions. In another embodiment, the portable cellular phone is modified such that the phone housing incorporates a security alarm system, radio receiver and other functions.

Abstract: A method for controlling the handover of a DECT portable part from a first DECT fixed part to a second DECT fixed part during provision of a data service, both fixed parts communicating with a GSM mobile switch center, the method comprising the first fixed part detecting that the handover has been requested, and in response modifying its control of the link between itself and the mobile switch center to inhibit acknowledgement to the mobile switch center of data not received by the portable part from the first fixed part.

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: An information presentation system is provided with: a data server for providing a predetermined kind of information data classified into a plurality of preset data groups through a communication line; and a portable communication terminal apparatus connectable through the communication line to the data server. The portable communication terminal apparatus is provided with: a connecting device for connecting the portable communication terminal apparatus to the data server through the communication line; an input device for inputting or specifying a desirable code from among a plurality of data group codes each indicating respective one of the preset data groups; and a terminal side transmitting device for transmitting the inputted or specified code through the communication line to the data server.

Abstract: A dynamic beam fill-in system (40) in a cellular communications network (20) having a constellation (22) of satellites (24) in orbit (26) with each satellite (24) having a plurality of antennas (30) configured to form cells (36) upon the surface (34) of the Earth. A first antenna (130) is configured to form a first cell (136) at a first location (144) for a first period (156) of time and at a second location (244) for a second period (256) of time. A second antenna (230) is configured to form a second cell (236) at least partially coincident with the first cell (136) during the first period (156). A third antenna (330) is configured to form a third cell (336) at least partially coincident with the first cell (136) during the second period (256).

Abstract: A method for detecting fraudulent use of a communications system detects and prevents fraud by assigning codes or randomly generated codes for communication access between a subscriber station and a fixed end and updating the codes upon the occurrence of one or more key events associated with subscriber activity in the communications system. The method permits detection and monitoring of fraudulent activity by permitting a legitimate subscriber station and an illegitimate subscriber station to have two different codes or dynamic codes after the legitimate subscriber station's identity has been misappropriated.

Abstract: A telecommunications system and method is disclosed for deliberately producing synchronous timing jitters in order to dynamically shift the delay spread within the overlap zone in a simulcast system. At a synchronous periodic rate, the timing differential between transmission of the signal from the control point to each of the transmitters can be continuously adjusted to continuously change the relative timing between multiple received signals in the overlap zone. Alternatively, the timing adjustments can be performed only upon reception of a retransmission request. In either case, the timing adjustments are performed so as to not be noticed by the mobile subscriber.

Abstract: A signal having a substantially uniform spectral distribution, e.g., a flat noise signal such as a signal ground, is provided at the input of a bandpass filter such as an IF filter of a receiver circuit, to thereby produce an output signal at the output of the bandpass filter. The output signal is processed in a limiter to produce a limited signal. An average frequency of the limited signal is determined, and the bandpass filter is adjusted based on the determined average frequency. According to one embodiment of the present invention, the bandpass filter comprises a Gm-C filter having a transconductance, and the filter is adjusted by adjusting the transconductance of the Gm-C filter based on the determined average frequency. According to another aspect of the present invention, a desired center frequency for the bandpass filter is identified. A resolution and a desired confidence interval are also identified.

Abstract: A method and system for automatically mapping areas of poor coverage in a cellular network uses signal quality information and mobile station location information. The system constructs a visual map that notes the locations of mobile stations when poor base station-mobile station communication signal quality is reported. The visual map can be used for identifying areas of the network that may require remediation to ensure sufficient network coverage.

Abstract: Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.

Abstract: A remote unit's (113) volume level is controlled locally through a user interface (105). The user interface (105) converts volume-up and volume-down instructions to an appropriate volume-up or volume-down command signal which is passed through a controller (107) to a local amplifier (111). When the local amplifier (111) is operating at a maximum gain level, and a user still perceives the audio output as being inadequate, an increase in volume results in the controller (107) sending a volume-up message via transmit circuitry (103) to infrastructure equipment (115). Upon receiving the volume-up message an amplifier (125) existing within the infrastructure equipment (115) increases its gain.

Abstract: A technique is used by a squelch circuit (200) that generates a fast squelch. The technique involves generating a noise signal (211) from a demodulated signal (105), generating a squelch check request (405) of one of two types, performing a release (410) of a reset control (107) in response to the squelch check request, generating an integrated noise signal (106) having essentially no decay rate from the noise signal starting at the release of the reset control, generating a result of a comparison (815, 860) of the integrated noise signal to one of two values corresponding to the one of two types of squelch check requests at an expiration of a predetermined delay started at the release of the reset control, and controlling a muting (845, 870) of a speaker (128) in response to the comparison.

Abstract: A cellular communications network includes a plurality of cells whose base stations have both sector and smart antenna capabilities. While engaged in a call, mobile station downlink signal strength measurements are made on its own serving traffic channel and the control channels of neighboring cells. These measurements are then adjusted by one or more factors which take into account the operational and physical differences between sector antenna and smart antenna. For example, the signal strength measurements may be appropriately adjusted by measured differences in gain between the smart antenna and sector antenna, output power backoff values associated with smart antenna and sector antenna support of the traffic channels in comparison to the control channels, and power control attenuation applied to the traffic channels.

Abstract: This invention relates to a radio transceiver operable in multiple modes. The transceiver is operable, in one embodiment, to communicate with digital and analogue modulation format cellular radio systems. The handset utilizes a novel frequency plan and architecture to enable a minimum level of complexity for dual-moe operation. The frequency plan preferably uses two local oscillators 1LO, 2LO to general all the required frequencies for both the digital and analogue modulation format transceivers, derived from a single reference crystal oscillator. A radio architecture is used to enable switchable dual-mode operation with maximum commonality of functional blocks to facilitate silicon integration.

Abstract: A mobile communication system includes cell segments each associated with a base station. The base station includes transceivers capable of communicating over two sets of carriers. A first set of carriers carry circuit-switched traffic, while the second set of carriers carry packet-switched data. Co-channel interference measurements are made by mobile units or by a serving base station in each cell segment during communications of active bursts of traffic or control signaling. Such bursts may include a training sequence that is used by the measuring device to recreate a burst without interference contributions. Co-channel interference is then determined based on the recreated bursts and the received bursts. Multiple interference values may be derived and applied to an averaging filter to calculate the final interference contribution value.