Abstract: In a radio paging system and a radio paging method, in which all transmitters are simply synchronized with each other with a satisfactory precision. A central exchange and each transmitter are each provided with a GPS clock for measuring time according to a current time transmitted from the GPS clock. An encoder of the central exchange adds to a message received from a network a real time, which is information to specify time to send the message from each transmitter, according to the current time measured by the GPS clock thereof and then distributes the message to the transmitters. A synchronizing section of each transmitter sends from a transmitting unit the message distributed from the central exchange to a receiver at a time specified by the real time added to the message according to the current time measured by the GPS clock thereof.

Abstract: The wireless local loop system employs cellular technology to provide telephone service to fixed telephones of remote stations having otherwise conventional handsets. The remote station emulates a conventional public switched telephone network by providing an artificial dial tone from the handset of the remote station, after the handset is taken off-hook. The artificial dial tone is locally generated by the remote station. The system, however, delays providing the dial tone if the system is busy, i.e. if the system is under a load condition. To this end, the system monitors load levels and transmits signals to the remote stations indicating load conditions. A remote station, prior to granting at dial tone to the user, receives the load condition signals, determines whether the system is currently under load and, if so, defers the dial tone.

Abstract: An apparatus for compressing a speech signal into a compressed speech signal that is represented by a plurality of parameters. A time-varying digital filter is used to model the vocal tract. A number of LPC coefficients specify the transfer function of the filter updated on frame basis. An excitation signal is input to the filter analyzed on sub frame basis. This excitation signal includes either an adaptive vector quantiser code or a first pulse sequence, followed by a second pulse sequence. Selection logic is used to determine whether the adaptive vector quantiser code or the first pulse sequence better represents the speech signal. Based thereon, a switch selects either the adaptive vector quantiser code or the first pulse sequence. Thus, the parameters which are transmitted through a channel to a destination decoder include the LPC filter coefficients, either the adaptive vector quantiser code or the first pulse sequence, the second pulse sequence, and one bit indicating the state of the switch.

Abstract: A system for communicating location data regarding the present service area for a "roaming" cellular paging device in a paging system. Each cellular paging device monitors a cellular network control channel to detect a cellular system identification signal transmitted by a cellular mobile radiotelephone (CMR) system. If the cellular system identification signal does not match a preassigned code for a host CMR system associated with the paging system, it responds by transmitting an identification signal to the MSC via the cellular network control channel. This identification signal includes: (1) a unique identification code that identifies the source of the identification signal, and (2) at least a portion of the system identification signal that was received by the cellular paging device. The CMR system determines that the identification signal has been transmitted by a "roaming" device associated with another CMR system and, accordingly, sends the identification signal to a verification system.

Abstract: An improved user interface for a cellular telephone system subscriber unit, including the following functions: (1) a predictive keyboard input method for speeding up input on a telephone with a space limited keyboard; (2) a word completion method for speeding up input; (3) a distinctive signaling method useful in a dual-mode or tri-mode cellular phone system that incorporates both voice call functionality and data messaging functionality; (4) a secret message method that permits secret messages to be received by an authorized user of a cellular telephone that includes a data messaging capability; (5) a message screening method that permits a user to set a message screening mode in a cellular telephone; (6) an improved "scratchpad" method which permits a user to enter a telephone number into a storage register of a cellular telephone while in the middle of a voice call, visually verify the entry, and then save the number to a rapid redial location for later use; (7) a global search method for searching text st

Abstract: In a code excited speech encoder, an input speech signal is segmented into speech samples at first intervals and a spectral parameter is derived from the speech samples that occur at second intervals longer than the first intervals, the spectral parameter representing the characteristic spectral feature. Each speech sample is weighted with the spectral parameter for producing weighted speech samples. The pitch period of the speech signal is determined from the weighted speech samples. A predetermined number of excitation code vectors having smaller amounts of distortion are selected from excitation codebooks as candidate code vectors. The candidate vectors are comb-filtered with a delay time set equal to the pitch period. One of the filtered code vectors having a minimum distortion is selected. The selected filtered code vector is calculated for minimum distortion and, in response thereto, a gain code vector is selected from a gain codebook.

Abstract: Methods and apparatus for selecting a system for communication with a personal station, such as a cellular telephone or a PCS station, in a roaming area. The personal station transmits a system access message to a default system. When the default system that receives the system access message is a visited system in the roaming area and the personal station is not registered with the visited system, the visited system registers the presence of the personal station in the roaming area with a home system for the personal station. The home system sends a response including a selection indication to the personal station through the visited system. The selection indication contains selection information for controlling selection of a system for communication with the personal station in the roaming area. The personal station selects a system for communication in the roaming area in accordance with the selection information.

Abstract: Subject-matter of this invention is a live voice device particularly for cellular telephone apparatus for use in motor vehicles equipped with a radio receiver apparatus including a low frequency power amplification section and a loudspeaker system for diffusion of sounds and equipped with a magnetic head to read a magnetically recorded tape, having electronic means adapted to handle the cellular phone low frequency signals for a free-hand and in live voice condition conversation with the telephone apparatus and through said loudspeaker system.

Abstract: A user, after accessing (41) the communication system (10), selects (42) a paged email service option. In response, the communication system (10) dispatches (43) a service logic block to a service node proxy (110) of an email system (101-105). The service logic block is deposited (44) in a site-specific service logic block repository (112) of the email system (101-105). An email monitor is established (45) for the email system (101-105). Once established, the email system sends (46) an acknowledgment to the communication system (10). The user is then notified (47) of receipt of the acknowledgment.

Abstract: A system and method for providing a mobility adjunct for a telecommunications network. The system and method allow one or more subscriber stations, connected to an analog interface of the network, and one or more wireless subscriber stations, each operating in a wireless telephone system of the network, to function as extension phones. The invention maintains a fixed line appearance and emulates a fixed termination in the network for the wireless subscriber station.

Abstract: A cellular telephone with a wire connection function has a unique telephone number assigned thereto and has a function of performing a wire speech communication upon connection to a wire telephone line to which another telephone number is assigned. The cellular telephone includes a connection section and a selection section. When an incoming call is received while the wire telephone line is connected to the cellular telephone, the connection section generates an outgoing call to a different terminal having a different telephone number, by using a radio channel or the wire line which is available, to establish a speech communication, and connecting the incoming call to the different terminal. The selection section selects whether to enable or disable the connection section. The call terminated to the cellular telephone can be connected to another designated terminal.

Abstract: A system and method of providing seamless interoperability for a mobile station roaming between cellular telecommunication systems operating in multiple hyperbands such as the 1900-MHz PCS hyperband and the 800-MHz cellular telephone hyperband, utilizing United States cellular standards. An enhanced inter-exchange communications protocol based on IS-41 is utilized to communicate information required for seamless interoperability between mobile switching centers (MSCs). The enhanced inter-exchange communications protocol comprises a plurality of signaling messages and a plurality of modified message parameters within the signaling messages. The modified message parameters are modified to include information elements required for seamless interoperability between the multi-hyperband capable exchanges and are added as optional (overriding) parameters to the signaling messages.

Abstract: A cellular telephone mobile unit position determining method which utilizes a plurality of range transceivers located at known fixed locations adapted to transmit approximately synchronized digital range signals. The method is especially adapted to determine the position of a cellular mobile unit within cellular service areas for determining billing charges and/or access restrictions. According to the invention, the fixed position range transceivers transmit range signals which are received by a mobile unit. The mobile unit determines either the time difference of arrival or absolute time of arrival of the range signals, which in turn is used to determine the mobile unit's position for cellular billing and/or access restriction purposes. The range transceivers are operable to receive an error signal and correspondingly adjust the output of the next transmitted range signal so as to drive the detected synchronization error to approximately zero.

Abstract: A method of transporting speech information over a wireless cellular communications system is provided. By determining the existence and compatibility of the destination port with the origination port in a given telephone call, the present invention is capable of using only one compression step and one decompression step. Accordingly, voice signal degradation and delay associated with multiple compression/decompression steps may be reduced.

Abstract: Information is retrieved from an information source by wirelessly receiving, at a cellular telephone switch, a request by a subscriber unit for a predetermined selection of information. The request is communicated to the information source using at least one of a satellite communication system and a wireless data network. The information source retrieves the predetermined selection of information. A transmission of the predetermined selection to the cellular telephone switch is inhibited if a utilization level of at least one of the satellite communication system and the wireless data network exceeds a threshold. When the utilization level is below the threshold, the predetermined selection is communicated to the cellular telephone switch. The predetermined selection is then forwarded to the subscriber unit when a utilization level of the cellular telephone switch is below a predetermined threshold.

Abstract: A method for selecting a code vector in an algebraic codebook wherein the analysis window for the coder is extended beyond the length of the target speech frame. By extending the analysis window, the two dimensional impulse response matrix can be stored as a one dimensional autocorrelation matrix greatly saving on the computational complexity and memory required for the search.

Abstract: A information fulfillment system and method for providing information to a caller having a wireless communication device. Upon receipt of sensory prompting and manual or automatic input of access codes to the wireless communication device, the caller's identity and the input access code are verified. Thereafter, the call is connected through the PWN and along the PSTN to the system messaging or fulfillment center for automatic or live-operator delivery of the requested information. Automatic verification, connection, and billing modification processes are provided for implementation of the system and method.

Abstract: A cellular telephone includes a receiver for receiving cellular communications and a transmitter for transmitting cellular communications. A controller is coupled to the receiver and the transmitter and controls the receiver and the transmitter based on the command signals. The controller includes a first memory for storing call rate information indicative of rates charged for the cellular communications. A timer provides a timer signal indicative of a time during which the cellular communications take place. The controller determines the amount of currency to be charged for the cellular communications based on the call rate information and the timer signal. An administrator station is provided for loading a threshold amount of currency into the cellular telephone. The entire system can be tracked and managed, and system wide statistics are available to the system operator.

Abstract: A portable telephone which solves problems conventionally associated with using a portable telephone together with a hands-free accessory is disclosed. When the portable telephone is being used on its own and a microphone arm thereof is in a home position, the portable telephone can be put in a waiting state wherein it can receive incoming calls. When the portable telephone is being used on its own and the microphone arm is in a pulled-out position, telephone conversations can be had using a microphone and a speaker built into the portable telephone. When the portable telephone is connected to a hands-free accessory and the microphone arm is in its home position, conversations can be had in a hands-free mode using a microphone and a speaker connected to the hands-free accessory.

Abstract: A personal communications internetwork provides a personal communications internetwork providing a network subscriber with the ability to remotely control the receipt and delivery of wireless and wireline electronic text messages. The network operates as an interface between wireless and wireline networks. The subscriber's message receipt and delivery options are maintained in a database which the subscriber may access by wireless or wireline communications to update the options programmed in the database.