Abstract: A communication system and methodology are implemented to anticipate periodic or predictable disruptions of communications in a satellite communication network. The communication system and methodology then compensate for this disruption in an appropriate manner. Such prediction and compensation actions are performed for a selected group of subscribers ("premium" subscribers) who wish to originate or receive telephone calls during the period of time that the outage or disruption occurs. To compensate for such predictable outages, the communication network takes advantage of the multiple gateways typically implemented within mobile satellite communicate networks. Rather than using the multiple gateways for redundancy, the communication network and methodology recognize that the multiple gateways may also be used for the alternate routing of telephone calls, particularly during a period of time in which the outage occurs. Through this methodology, a "virtual routing" operation may be executed.

Abstract: A direct-access satellite telecommunications system employs one or more telecommunications satellites in geosynchronous orbit. Small, low-cost user terminals are located at the user's premises and permit two-way telecommunications via user links. Access links provide satellite telecommunications to larger gateway stations as well as a network control center. Gateway stations store user information and provide connection to terrestrial telecommunications networks. In operation, the network control center allocates satellite bandwidth and power to setup the access and user links, with a minority of the satellite's power being allocated to the access links, and a majority of the power being available for the user links.

Abstract: A system and method for temporarily relocating a subscriber in a cellular communications network to a new location such as another telephone. The subscriber enables the service by contacting a user interface system, which then instructs a home location network associated with the subscriber's home network and accessible through an intelligent network to provide appropriate information to the switch that is serving the new location. As a result, the subscriber may receive services that are identical, equivalent, or a subset of those that he receives from his home network.

Abstract: In a land mobile radio system including at least one base site having a system for interconnecting a plurality of radio channel units with a plurality of directional antennas and/or antenna beams, the base site further includes an interference avoidance system for controlling communications between each radio channel unit of the base site and mobile radio units communicating with the base site so as to avoid causing potential interference at the operating frequency of each radio channel unit at other base sites. The interference avoidance system monitors potential interference at the operating frequency of each radio channel unit on each antenna beam.

Abstract: When an interference signals is detected by a base station, the base station issues a report to a switching apparatus. The switching apparatus checks self to see whether it is in a standby mode waiting for a frequency change completion report from another base station which is in the process of changing the control channel frequency. If the switching apparatus is satisfied that the station should be given a new control channel frequency, it issues a frequency change command to the requesting base station, and the base station receiving the command revises the current control channel frequency. In the meantime, all other requests from other stations are denied by the switching apparatus until the requesting base station has successfully completed the process of changing the control channel frequency. The base station acknowledges the completion of frequency change process by sending a frequency change completion report to the switching apparatus.

Abstract: A communication terminal enabling a control command to be accurately and easily made up. On account of the provision of controller not only for successively displaying predetermined items to allow a user to select and decide desired items but also for displaying the input instruction of a predetermined information type to allow the user to input a predetermined information type, thereby making up a control command on the basis of the relevant selected result and the predetermined information type, a user can accurately and easily make up a control command only by inputting the instructed type of information while successively selecting desired items.

Abstract: A method is provided for updating a time-remaining value representative of the time remaining during a predetermined period of time for communication between a mobile communications device and a radio telecommunications network, the mobile communications device having a memory site in which the time-remaining value may be stored. The method has the step of communicating an update request signal from the mobile communications device to the radio telecommunications network. The method also has the step of communicating an initialization value representative of the time remaining within the predetermined period of time for communication between the mobile communications device and the radio telecommunications network from the radio telecommunications network to the mobile communications device in response to the update request signal. The method has the further step of storing the initialization value in the memory site.

Abstract: The invention relates to a transmission method and a cellular radio system comprising a base station and a vocoder which communicate with each other via a transmission path and which transmit a signal to each other. The vocoder receives a signal and encodes the received signal which at least partly consists of spare bits. The cellular radio system comprises a filtering means for filtering spare bits off the signal prior to transmitting the signal to the transmission path. The filtering of the spare bits makes it possible to save the transmission path capacity for other uses.

Abstract: A double balanced mixer consisting of two complementary solid state switches, with a high reverse-bias voltage provided by isolating the sides of the complementary solid state switches receiving the carrier signal from one another, and connecting the other sides together. If the solid state switches are designed to couple the input signal to the output signal in response to the carrier signal having an amplitude of zero volts, then a solid state switch in forward-bias will have a potential of zero volts on both sides of it. While this solid state switch is in forward-bias, the second solid state switch will be receiving the complementary carrier signal on one side, which is a high positive voltage, and zero volts on the side connected to the first solid state switch. The second solid state switch will therefore see a reverse-bias potential difference equal to the potential difference between the positive voltage of the complementary carrier signal and zero volts.

Abstract: The invention relates to the use of intelligent network services from a terminal (3) of a telecommunication network and particularly to the introduction of new services and a programmable user interface of a terminal. A service provider (5) programs service functions in a switching centre (1) of a telecommunication network and delivers to a user a program which is loaded in the user's terminal (3). According to the loaded program the terminal, advantageously a telephone apparatus equipped with a display (7), shows to the user the available services and the corresponding commands assigned to the function keys (8a) of the terminal. The user gives the required commands which advantageously are one-push-of-a-button long and the meanings of which at each particular situation are shown on the terminal's display. Advantageously the program is delivered to the user by loading it in an intelligent card (6) controlling the operation of the terminal.

Abstract: A radio selective calling receiver includes a radio section, a display section, and a CPU. The radio section receives a radio selective signal from a base station. The display section has first and second display areas and displays the message contained in the radio selective signal from the radio section in a dot matrix. The CPU automatically switches between the first display mode of using only the first display area and the second display mode of using both the first and second display areas in accordance with the contents of the message.

Abstract: An alarm panel of a security system communicates with a remote monitoring arrangement using a cellular communication protocol which deports from the conventional AMPS protocol and is less vulnerable to fraudulent activities. The modified protocol reduces transmissions from the cellular arrangement to the cell site by ignoring query signals. The cellular arrangement continues to monitor received cellular transmissions to provide an assessment of the ability to respond.

Abstract: The invention provides a technique for measurement of a signal to interference power ratio wherein an SIR can be measured with a higher degree of accuracy without being influenced by a fast fading environment or an inter-station interference or noise environment.

Abstract: A mobile audio program selection system includes a radio frequency based information distribution system having mobile users. The distribution system includes a mobile switching office selectively connecting the mobile users of the information distribution system, and information service providers. At least one of the information service providers receives user selection signal inputs received by the mobile switching office, and transmits user selected information to the mobile switching office. In addition, the distribution system includes at least one mobile terminal. The mobile terminal includes a receiver receiving the user selected information from the at least one of the information service providers via the mobile switching office.

Abstract: A radio communication system including a plurality of base stations which communicate with a plurality of radio terminals respectively is provided with a capability of avoiding occurrence of radio interference of control channel signals among a plurality of base stations even when a plurality of the base stations are located in the close vicinity of each other. The base station of the radio communication system is provided with a device for receiving, when the power is turned on, a control channel signal which is being transmitted at a certain interval by each of the other base stations in the system, a device for frame synchronizing each of TDMA frames of the control channel signal which is received, a device for extracting base station identification information of each of the other base stations from the TDMA frames which are frame synchronized, and a device for storing in a memory each of the base station identification information which is extracted.

Abstract: A telecommunications system and method is disclosed for allowing a cellular network to determine the optimum positioning method, having knowledge of all available network-based and terminal-based positioning methods. This can be accomplished by the Mobile Station (MS) sending to the Mobile Switching Center/Visitor Location Register (MSC/VLR) a list of terminal-based positioning methods that the MS is capable of performing. This list can, in turn, be forwarded to the Mobile Positioning Center (MPC) for determination of the optimum positioning method. For example, in a GSM network, the MS CLASSMARK information, which is sent to the MSC/VLR when the MS registers with the MSC/VLR, can be extended to include the MS's positioning capabilities.

Abstract: A low noise quadrature mixer circuit for RF has an input stage which is a single ended to differential converter, where the cascode transistors each include two transistors with common emitter and base connections and separate collector outputs. The separate collectors serve as current outputs to drive the switching stages of the mixer. With two current outputs from both the positive and negative sides of the single ended to differential converter, this drives the emitters of two separate sets of cross coupled emitter coupled pair transistors that make up the output switching stages of the mixer. With the two sets of cross coupled emitter coupled pairs, one set is driven by an in phase local oscillator signal and the other is driven by a quadrature local oscillator signal. The resulting output signals are two intermediate frequency (IF) differential voltage output signals that are in quadrature (90.degree. out of phase with each other).

Abstract: In a frequency hopping communications receiver an automatic gain control process in which the mean signal strength of bursts of different frequencies and co-channel interference are detected, a weighted average based on the signal strength and co-channel interference is formed and the weighted average is used as a gain control signal.

Abstract: In the method and circuit for creating a modulated signal, one input signal of a phase comparator (509) of a phase-locked frequency synthesizer is an offset frequency (f.sub.2), which is created from an adjustable oscillator's (511) output signal (f.sub.TX) by mixing it with a mixer frequency (f.sub.1) and filtering the obtained result in a low pass filter (508). The other input signal is a fixed reference frequency (f.sub.r). The adjustable oscillator (511) is controlled with a control signal (V.sub.CMOD), which contains a component resulting from the phase difference of said input signals (f.sub.r, f.sub.2). Modulation is created in the output signal (f.sub.TX) of the loop by adding a frequency or phase change to at least one of the input signals (f.sub.r, f.sub.2) or their derivatives, advantageously with pulse delay technology.

Abstract: Multichannel communications method and system wherein transmit power is controlled for each channel to achieve progressive approach towards a preset or given minimum of signal (or carrier) to noise plus interference ratio (SNIR) for any active channel concerned. Progression is by steps from frame to frame of transmissions according to signals as received in the previous frame and scaling of difference between reciprocals of previous frame actual and preset or given minimum SNIRs.