Abstract: A business telephone system employs digital signal processing in a digital telephone having a serial link for connection to a general-purpose computer. The Smart Phone is the central intelligence for the system, which may utilize a PBX connected in a LAN network to multiple computers, including file servers, and each computer may have one or more Smart Phones connected. In one embodiment, docking bays in the phone provide an ability to interchange finctional modules, including DSP modules. The docking bays and functional modules may be configured to PCMCIA standards. In another embodiment, a docking bay, which may also be PCMCIA, has a physical window allowing access to an input area on a docked module, wherein the docked module is an intelligent module with a CPU, a memory, and a bus structure, affording control of the smart phone and the entire system through the input interface of the docked module.

Abstract: A system and method for providing radio routing and radio frequency channel assignment in a radio telephone system utilizing signal strength and routing messages as a primary criteria for obtaining interference free call connections and communications.

Abstract: A modem-controller for auto switching and controlling the transmission and receiving of voice and error-free transmission of standard data signals, fax data signals and voice communications over telephone line service, radio frequency networks, satellite systems, as well as cellular telephone systems includes analog switches that receive control signals from the micro-controller for controlling and switching the audio or data path of an internal voice board and the analog signals from a modem to and from a radio frequency transceiver via a radio frequency transceiver interface/logic board, a cellular telephone transceiver via a cellular telephone transceiver interface, a telephone landline via a data access arrangement (DAA), a satellite system via a telephone landline through the DAA. A method selects the DAA which either connects to the telephone line, the satellite system or the cellular telephone, and another method bypasses the DAA, selects and controls radio frequency telemetry modules or packet radios.

Abstract: A GPS unit and a cellular telephone unit each have add-on modules for providing additional functionality. A battery powered hand-held GPS unit has a battery power module with a built-in cellular telephone. The controls on the GPS unit are used to control cellular telephone operations. The GPS controlled cellular telephone transmits position location information obtained by the GPS unit. Alternatively, a battery powered hand-held cellular telephone unit has a battery power module with a built-in GPS device. The controls on the cellular telephone portion are used to control GPS device operations. The cellular telephone portion is able to transmit position location information obtained by the GPS device. The GPS and a cellular telephone device can function with either a standard battery module, or with a battery module having a cellular telephone or a GPS device built into the battery module.

Abstract: Communication services can be controlled within geographic areas (126) by a communication resource controller (101). This occurs, when the communication resource controller (101) receives the location of a particular communication unit (102, 103) and a particular service request. Having this information, the communication resource controller (101) accesses a database (124) and determines whether that particular service request is restricted in the area that the unit is located. If the service is restricted in that area, the communication unit's (102, 103) request is denied.

Abstract: A cellular mobile radio system comprises cells divided into P sectors each having its own timebase. The system uses time division multiple access and accordingly transmission is effected in bursts each transmitted during a time slot, or channel time slot, of predetermined rank relative to a reference of the timebase of the sector concerned. N time slots form a frame which repeats periodically. A control channel is reserved for each sector for transmitting signalling and control data, a different control channel being associated with each sector. The timebase of each sector is shifted a predetermined number of time slots relative to the timebases of the other sectors of the same cell. The offsets are such that the control channels relating to each sector are conveyed at different times.

Abstract: A radiotelephone (303) comprises a plurality of subscriber identities (306-308) operative in a radiotelephone system (300) at the same time. The radiotelephone network (301) processes incoming and outgoing calls for the radiotelephone (303) using any one of the subscriber identities (306-308). A standard telephone interface (401) optionally provides communications between the radiotelephone (303) and one or more standard telephone sets (413-415) using any one of the subscriber identities (306-308). A method for operating the radiotelephone (303) is also disclosed.

Abstract: A Personal Communications Service (PCS) System is described. The frequency control system (30) allows PCS systems to coexist in the same frequency band as Private Operational Fixed Microwave Service (POFS) systems without mutual interference. This system (30) also controls frequency usage within a PCS system to eliminate interference from within the PCS system. This interference elimination system combines theoretical radio frequency interference analysis with measurements of actual frequency usage and allows for efficient and coordinated dynamic frequency allocation planning and management. To control frequency assignment and eliminate interference, the system (30) employs several mechanisms including an intersystem interference analysis, an intrasystem interference analysis, a channel use verification (CUV) procedure, and a measured data analysis (MDA).

Abstract: A line communication system for linking a plurality of telephone subscribers to a public telephone exchange, wherein the subscribers are each located within the same general area, and wherein each subscriber is fed from the same mains electricity sub-station with mains electricity is provided. The line communication system provides subscriber apparatus which includes a cordless telephone (CT) handset and a frequency convertor for each subscriber. The handset is hard-wired to the mains electricity supply conductors via the frequency convertor so that CT signals at UHF are down-converted to HF for transmission through the mains electricity conductors. A CT base station is connected to the public telephone exchange. The CT base station is connected to the mains electricity supply conductors via a further frequency convertor for HF line communication purposes.

Abstract: In a two-way interactive communication video network having a network switching center for point-to-point communications between subscribers at different geographic locations, a local base station configuration is provided for facilitating low power battery operated portable subscriber units. The local subscriber units surrounding a base station are adapted for multiplex transmission of digital messages synchronously related to a broadcast television signal for system coordination. Digital messages are transmitted from the local subscriber units to the base station data processing facility through a set of receive only cell site subdivision zones distributed over the base station transmitter geographical range, which communicate with the base station data processing facility over a communication link such as wired cable. Messages are compiled and relayed by satellite to a network switching center transmitter site for nationwide point-to-point communications.

Abstract: A terrestrial Rf telephone system provides a plurality of voice signal channels on a plurality of forward direction carrier frequencies, each carrier frequency having an associated predetermined bandwidth which is designed to accommodate one analog voice signal, and each carrier frequency containing a plurality of slots. The system includes a base station having a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals; a plurality of compressors for compressing the voice signals; a processor for assigning each of the compressed voice signals onto a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining the compressed digitized voice signals into a single transmit channel bit stream, with each compressed voice signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; and a plurality of modulators for modulating the carrier frequencies.

Abstract: One embodiment of the invention is related to a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network, wherein one of communication network is of the GSM (Global System for Mobile Communications) type, including a bridgehead between the first and second mobile communication network, said bridgehead serving as an internetwork junction to one of said mobile communication networks of the GSM type (transition network). The bridgehead acts as a Visitor Location Register (VLR) for another mobile communication network and as a Home Location Register (HLR) for the transition network, if a subscriber of the other mobile communication network is in the range of the mobile communication networks of the GSM type and acts as an HLR for the other mobile communication network and as a VLR for the transition network, if a subscriber of the mobile communication networks of the GSM type is in the range of the other mobile communication network.

Abstract: A method for transmitting messages using an efficient communications link protocol over an air interface of a cellular communications system is disclosed. A frame in the protocol is divided into a plurality of sections including a header section and a data section. The header section contains a field which indicates what type of information is contained in the frame.

Abstract: A cellular system for distributing a plurality of television programs in a desired service area. A plurality of groups of spaced transmitting antennas are disposed substantially on the peripheries of adjacent cells disposed in the service area. The antennas are directional and directed to propagate substantially simulcast signals into the cell with which the antenna is associated so that the propagation patterns of the transmitting antennas associated with the cell overlaps over substantially a major portion of the area enclosed within the cell. Antennas disposed substantially on the peripheries of adjacent cells propagate directional signals into each of the adjacent cells. In a broadcast version the frequencies of the signals transmitted by all of the antennas are the same. In a dedicated service version the frequencies of the signals transmitted into adjacent cells are different.

Abstract: Various embodiments of an automatic alarm and communications processing system/method are presented. The alarm processing system/method monitors at least one sensor unit which is designed to provide an alarm signal upon occurrence of a corresponding predefined condition. An alarm signal is received at a central unit and a predefined alarm message is retrieved from memory based thereon. A selected telecommunications medium is then designated from at least two telecommunications medium coupled to the alarm processing system, and the retrieved predefined alarm message is automatically sent over the selected telecommunications medium. Preferably, the alarm processing system is powered down until an alarm signal is received at the central unit. Upon receipt of the alarm signal, powering of the alarm processing system is triggered, and subsequent to transmission of a predefined alarm message, powering of the alarm processing system is automatically removed.

Abstract: A new data circuit equipment (DCE) coupled to an IWF and a terminal adapter (TA) coupled to a mobile station provide interconnection within a RF communication system such that Class 2 service common to wireline network equipment can be beneficially employed in the wireless RF communication system. The new DCE and TA are transparent to external wireline systems while maintaining compatibility with, inter alia, the predetermined data service protocol layers of the RF communication system, the RF air-interface and/or radio link protocol (RLP) of the RF communication system.

Abstract: A wireless communications system (1) has at least one base station, such as a personal base station (5), and a plurality of mobile stations (10) capable of wireless slotted communications with the at least one personal base station. A method includes a step of periodically deactivating, for a predetermined period of time, a base station transmitter (32) from transmitting a RF signal to at least one MS. A next step, executed during the predetermined period of time, operates a base station receiver (34) to perform a received signal strength (RSS) measurement. In a first embodiment of this invention the step of deactivating includes a preliminary step of reserving a reverse slot for use by the base station, thereby insuring that a mobile station will not transmit during the reserved slot. In this case the RSS measurement occurs during the reserved slot.

Abstract: This invention relates to a wireless communication system, which comprises plural wireless communication units having different communication protocols, and in which a proper wireless communication unit is automatically selected from the plural wireless communication units in accordance with the operation states of the plural wireless communication units to make communication possible. Thereby, troublesome operation is not required, an optimum wireless communication method can be automatically selected, and communication cost can be reduced. In the wireless communication system of the present invention, when mobile stations are registered in a fixed station, preferential orders of the mobile stations are stored, and calling/call-reception and communication processings are controlled according to the preferential orders.

Abstract: The present invention encompasses a method of facilitating talkgroup communications across a multiple-system communication network (100). A typical multi-system network (100) includes a plurality of communication units (122), a plurality of communication location areas (117-119), and a plurality of system controllers (100, 116). Upon migration of a communication unit (122) from one communication system to another, the communication unit (122) sends a registration request to the system controller (116) at the new communication system (102). The system controller (116) determines whether the talkgroup of the migrating communication unit (122) is registered with the new communication system (102). If the talkgroup is not registered with the new system (102), a database (120) is updated with the new talkgroup information, thereby facilitating talkgroup communication involving, members of the talkgroup.

Abstract: A method and apparatus for matching the location of the forward link handoff boundary to the reverse link handoff boundary. A system constant is chosen which defines the product of the received power and the transmitted pilot power at every base station. The reverse link power level is measured at the base station and the forward link power level is compensated for the reverse link loading to maintain the constant product. Thereby the forward link handoff boundary to the reverse link handoff boundary are aligned to the same location.

Abstract: A network access scheme enhances channel utilization under the ALOHA protocol by making use of the FM capture effect. The resulting network access scheme allows a transmitter to transmit a message simultaneously with other transmitters to a receiver without the need for retransmission when the message reaches the receiver with sufficient strength over the strengths of the other transmissions. In one embodiment, the network access scheme is applied to a wireless data network, which includes support to a two-way paging application. Another network access scheme combines the high channel utilization of the carrier sensing multi-access (CSMA) protocol with the FM capture effect to provide even higher expected channel utilization. The resulting network access scheme uses a channel access protocol ("CSMA/AT") which provides an adaptive threshold. An RF transmitter determines, using the adaptive threshold, whether or not to transmit its message.

Abstract: A method of assigning and sharing carriers in a cellular communications system having a plurality of cells forming a plurality of cell clusters of size N. Each cell has at least one base station capable of sending and receiving signals and each cell has a plurality of adjacent cells. A plurality of distinct carriers are allotted for use by the system and divided into N groups which are assigned among the N cells of each cell cluster so that each cell cluster has a substantially similar assignment of distinct carrier groups. Each group of distinct carriers is divided into a plurality of carrier subgroups wherein each subgroup of carriers of a cell substantially corresponds to an adjacent cell. The subgroups of carriers are respectively designated for borrowing by cells adjacent to a corresponding cell. When all of the carriers assigned to a cell are utilized, a carrier can be borrowed at limited transmitted power, from a corresponding subgroup of carriers of an adjacent cellular gateway.

Abstract: The present invention provides a system and method for using the brief time intervals between cellular telephone calls on a primary cellular network to transmit and receive data over a second data-only network. The invention uses the built-in capability of the primary network to monitor and track each call and to identify the relatively short-duration intervals between each call to pinpoint when a short burst of data from the second network can be transmitted without interfering with primary network calls. The data network includes a separate telephone exchange. Selected base stations of the primary cellular network are shared with the data-only network. Land lines or other connections link the data network exchange with the shared base stations. Preferably, the data network is accessible via a public packet data network. Data calls on the second network are directed to the shared base stations and inserted into the brief intervals between primary network calls.

Abstract: A transaction handling system (THS) for use in a cellular telephone network using Short Messages is described. The THS comprises means for receiving digitally encoded information from one or more sources, such as magnetically encoded credit card information related to credit cards, smart cards, bar codes etc. Means are provided for interpreting the digitally encoded information into a message compatible with a particular database relevant in the transaction and formulating a query to the database. The query is routed to the database. Upon receiving a reply from the database, the reply is interpreted in the THS for compatibility with the cellular network and the structure of the Short Messages within it, and routed to a terminal having a display, printer or other input/output means.

Abstract: A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols.

Abstract: An apparatus for interfacing at least one land-line telephone service, at least one wireless cellular-type telephone service, at least one cellular-type wireless telephone and at least one standard telephonic type communication device through standard building interior telephone cable.

Abstract: A system and method extracts a portion of a transmitted waveform and compares the transmission characteristics of the extracted waveform to determine if they match a stored fingerprint associated with the transmitter, such as a cellular telephone. The system adaptively creates fingerprint data by storing a plurality of waveforms believed to be from a particular transmitter and calculates the variability of the individual transmissions with respect to a composite mean waveform of the transmission characteristics. The system emphasizes the variability between the individual waveforms and the composite mean waveform and determines variability values for each of the individual waveforms in the fingerprint. When the system receives an additional unidentified transmission purported to be from the transmitter with the stored fingerprint, the system determines whether the variability of the unidentified waveform fits within the predetermined margins of variability for the fingerprint.

Abstract: A cellular communications system that includes forward channel communications to users and corresponding reverse channel communications from mobile users. The users travel from one area to another area over one or more zones. The forward channel communications are broadcast directly to users in a broadcaster zone. The reverse channel communications from users are not returned directly but are first collected at locations arrayed over the broadcaster zone. After collection, the reverse channel communications are forwarded to complete the full duplex communications. The forward channel communications are point to multipoint while the the reverse channel communications are multipoint to point. The communication system separately handles the point to multipoint forward path as a direct broadcast and the multipoint to point reverse path using multiple collection points. Since the forward and reverse paths are separately configured, the present invention optimizes both the forward and reverse paths.

Abstract: A system for deterring fraudulent cloning by a reader station of valid call-origination message parameters assigned to authorized mobile radiotelephone stations operating within a cell or other area of a cellular radiotelephone system in which valid call origination messages are initiated between the mobile stations and a fixed cell-site radiotransceiver station for that cell or area. A database containing a plurality of valid call-origination message parameter combinations assigned to the authorized mobile stations is established in the radiotelephone system. An auxiliary fraud-deterrent transmitter station transmits call origination messages containing invalid parameters in such cell or area the cellular radiotelephone system. These invalid parameters are not verifiable at the database. The reader station receives both the valid and invalid call origination messages with an inability to discern with certainty between the valid and the invalid call origination messages.

Abstract: An information transmission system includes a base station with a base transmitter and a plurality of satellite stations. Each satellite station includes a satellite receiver for receiving a transmission from the base station and a satellite transmitter including a transmitter amplifier, the transmitter amplifier requiring a preparation period of time to prepare the transmitter amplifier for operation. The transmission of information between and satellite station and the base station occurs during a transmission portion of a selected time slot within a succession of time slots. The amplifier in each of the satellite stations is prepared for transmission during a preparation portion of a same time slot having a duration at least equal to the preparation period for the satellite station transmitters and occurring prior to the transmission portion of the selected time slot.

Abstract: The present invention provides for an apparatus which allows an operator of a mobile communications unit, configured to receive and process signals generated by a Global Positioning System (GPS) and transmit them to a base communications unit, to be in voice communication with an operator of the base communications unit, wherein the base unit operator can provide the mobile communications unit operator with geographic location information by voice communication while the base unit receives the processed GPS signals, translates these signals into the geographic location information and provides a visual image of the information to the base unit operator.

Abstract: A method and apparatus controls zone registrations in a radio communication system providing radio coverage to a portable subscriber unit (122) within a plurality of zones (402), wherein the portable subscriber unit (PSU) determines its own call rate (602). A fixed portion (102) of the radio communication system sends the PSU a threshold value based on communication activity associated with the PSU, a call rate estimation interval value, and a multiplier for normalizing the PSU's own call rate with the threshold value. The fixed portion accepts zone registrations from the PSU when the PSU's own call rate is greater than the threshold value and defers zone registration from the PSU when the PSU's own call rate is less than or equal to the threshold value until the PSU's own call rate exceeds the threshold value.

Abstract: A service protection enclosure (SPE) for a cellular telephone or other wireless telecommunications transceiver site is disclosed. The site has at least one antenna (3) which transceives communication signals, radio equipment for receiving and sending radio signals from and to the antenna, transmission means (37, 39) for connecting the radio equipment and the antenna so as to carry the signals therebetween, AC power service lines (47) for providing power to the site, and telephone lines (48, and/or 115) for connecting the site with a telephone or other communication network. The services protection enclosure comprises a cabinet (35) adapted to be secured to a suitable foundation (29), the cabinet having side walls (55, 57), a top (53), and at least one door (61 or 63) providing access to the interior of the cabinet. The cabinet houses an AC power distribution panel (101) and receives the AC service lines (47), the telephone lines (48), and the RF transmission means (37, 39).

Abstract: In a microcellular system operated in the same frequency band as a cellular system, an interference-free channel is automatically searched and allocated. The microcellular system which shares the frequency band with the cellular system comprises a control unit, a base station and a multi-channel selecting receiver. The multi-channel selecting receiver monitors a use status of cellular channels of the band by repetitively scanning voice channels for a scanning time period substantially longer than the duration of any single voice communication to detect idling channels and allocates them to its own system. Whenever a communication request is issued, the base station detect a channel not used by its own system from the idling channels and allocates it for communication.

Abstract: In a communication system (10) which includes a communication unit (56) (CU), a Mobile-Switch Interface (50) (MSI), and a Mobile services Switching Center (40) (MSC), a method for location registration and call continuation involves the MSI (50) determining (174) whether the CU (56) intends to utilize a system service after the CU (56) completes a location updating process without releasing a channel between the CU (56) and the MSC (40). When the CU (56) does intend to utilize the system service directly after the location updating process, the MSI (50) allows the CU (56) to utilize the system service regardless of whether the MSC (40) indicated that the CU (56) cannot utilize the system service without first releasing the channel.

Abstract: In methods and apparatus for assessing voice quality in AMPS cellular radio systems, a signal-to-noise ratio is estimated for a SAT signal of an RF channel, and the voice quality of the RF channel is inferred from the SAT signal-to-noise ratio.

Abstract: A base station controller interface of the code division multiple access (CDMA) mobile system is described for interfacing between the base station controller and the CDMA mobile switching center (MSC) of the CDMA mobile system (CMS). The base station controller decreases the load of the system by including, for every base station controller interface, the mobile announcement (MANM) to service the state information of the subscriber of interest for all paging to the mobile subscriber. At the same time, the connection between the base station controller and the base station controller interface of the mobile switching center utilizes the EL 2048 Kbps interfacing technique applying the conventional communication network recommended in the ITU-T. The transmission of the message and the call traffic using the interfacing technique is performed to be linked with the TSB of the base station controller.

Abstract: A method for establishing connections between one node and a plurality of other nodes sharing transmission resources is disclosed. A small subset of the total channels available is switched through (preconfigured) from the common node to each of the plurality of remote nodes, without any specific use for these channels being apparent, i.e., the preconfigured channels are idle. All remaining channels being retained as unswitched reserves which are as yet uncommitted. These preconfigured channels act as a buffer stock of transmission resources, which decouples the need to be able to use a connection rapidly from the time taken to configure that connection.

Abstract: A method of reducing interference within a cellular system (10) by partitioning a designated frequency spectrum within a service coverage area (11, 12, 13, 14, 15, 16, or 17) into a first and at least second spectrum inclusive of the designated frequency spectrum and each with an associated power level. Assignment of communication units to a spectrum and power level are based upon distance from the base site (as determined through signal strength measurements). The spectral content of spectra in adjacent service coverage areas is adjusted to include non-coincidental frequencies.

Abstract: Improved apparatus for a radio communication system having a multiplicity of mobile transceiver units selectively in communication with a plurality of base transceiver units which communicate with one or two host computers for storage and manipulation of data collected by bar code scanners or other collection means associated with the mobile transceiver units. A network controller provides selective interface means to be employed between the host computers and the base transceivers whereby low data rate base transceivers may be utilized with the network controller while spread spectrum or high data rate networked base transceivers may be also utilized. The network controller may allow selection of interface means for three of its ports from its front panel with use of three input keys. The network controller is entirely external to the host computer or computers, and can couple to a variety of commonly encountered host ports.

Abstract: A communications system includes a plurality of directional signal propagators, each defining a cell. The cells are arranged in a plurality of rows (R1 to R12), each row including repeating sequences of four propagators transmitting first, second, third and fourth signals (A, B, C, D), respectively, wherein the sequences in successive pairs of contiguous rows (R1, R2 etc.) are offset by one cell, and wherein diagonally arranged pairs of the propagators in pairs of contiguous rows transmit the same signal.

Abstract: A communications accounting system is provided wherein the transfer of call detail record information from a remotely located phone may be accomplished in an efficient manner. During non-billable processes or during airtime billed at a reduced rate, the call detail record (CDR) information from the previous registration is simultaneously sent to the collector system for processing to the billing system. More specifically, encrypted and compressed authorization information and call details records (CDRs) from the previous use of the phone are simultaneously communicated from the Cellular Call Computer--Programmable Off-line (C3PO) to the host computer system by modem or other suitable manner. At the validation server, the authorization information is decrypted and uncompressed and stripped away from the CDRs, while the call is live, and sent to an authorization service.

Abstract: A cellular telephone network with the capability to detect faulty cellular telephones in use in the network. The network includes measurement units at some or all of the cell sites. The measurement units monitor the radio links between each cell site and specific cellular telephones. Measurements taken at all the cell sites are accumulated at a test system controller. The test system controller stores and processes the measurements to detect faulty cellular telephones. When a faulty cellular telephone is detected, a trouble manager notifies the subscriber of the fault so that it might be repaired before the fault affects cellular telephone service. The same measurement techniques are also used to detect fraudulent telephone usage and network problems.

Abstract: An exemplary embodiment of the present invention provides a method for establishing a communication path between a first mobile station and a second mobile station both positioned within an operating region of a base station in a cordless communication system. According to the embodiment, subbands are first checked to determine whether an available subband within an auxiliary communication band exists. When an available subband exists, a synchronization packet is transmitted from the first mobile station to the second mobile station using an initial synchronization frequency. In response to receipt of the synchronization packet by the second mobile station, a synchronization identification packet is transmitted from the second mobile station to the first mobile station.

Abstract: Security officers (38) can be summoned to help a person (28) in distress, by providing portable pagers (40) to a group of officers assigned to a protected area (26). A person entering the area carries an alarm unit (30) which, when actuated, transmits an emergency signal. When the emergency signal is received at a station (12, 32), the person's location is determined. All the security officers are then located by transmitting a location inquiry signal, and determining the officers' locations using location signals emitted from their pagers (40) in response to the inquiry signal. An officer nearest the person is identified, and an assistance order signal conveys the person's location to the officer's pager. If the officer does not manually activate his/her pager to confirm receipt of the person's location, by transmitting an acknowledgment signal during an interval following the order signal, the latter is re-transmitted to other officers near the person until an acknowledgment signal is detected.

Abstract: A multisubscriber unit is disclosed for use of in a digital cellular communication system to communicate with a base transceiver station and eventually to switched telephone network. The multisubscriber unit connects to a plurality of individual subscriber telephones. It includes a plurality of upconverters, modulators, downconverters, demodulators speech compressors, speech decompressors, and voice activity detectors that are assigned to a subscriber telephone upon detection of an off hook signal from the telephone. Preferably, upon the detection of data to be transmitted, to channel allocation is requested from a pool of time division multiple access channels in a digital speech interpolation pool.

Abstract: A radiotelephone (RT) operates in either a cellular telephone mode or a cordless telephone mode within a cellular telecommunications system. The RT operates in the cordless mode if it is within the operating range of a cordless base station. The cordless base station receives data from a central telephone office, converts the data into a transmittable caller ID message, and transmits the caller ID message to the RT. The RT receives the caller ID message and displays it in a readable form to the user. The caller ID message may be saved at the RT for subsequent retrieval by the user. In addition, a speed dial operation may be performed to respond to the caller ID message.

Abstract: Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern. Each SS broadcasting station include a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent stations in the cellular pattern, each channel signal including navigation beacon data including a unique beacon identification, station latitude and longitude, time slot and phase stations. In one embodiment, each modulator provides a chirped SS signal in which the navigation beacon is a frequency tone that is repeatedly swept over a selected frequency band for each station. A receiver on the mobile body receives the SS signals from at least three of the SS broadcasting stations and determines the location thereof. A fourth SS broadcasting station provides altitude. GPS satellite signals can be used for timing control.

Abstract: In a cellular mobile radio system including a plurality of cells grouped into identical patterns, each of at least two cells, repeated periodically in space and such that: each cell is associated with one or more base transceiver stations to send radio signals to or to receive radio signals from mobile stations. Each transceiver station sends and receives radio signals using a set of frequencies associated with its cell and including at least two different frequencies, all the frequencies of sets of frequencies associated with cells of the same pattern being different. The frequency of the signals exchanged between a mobile station and a base transceiver station of a cell changes in time with the result that several frequencies of the set of frequencies associated with the cell are used successively during the transmission. In this system, the plan of the mobile radio system is obtained by superposing the plans of a plurality of mobile radio systems each having a different number of cells per pattern.

Abstract: Cell selection and reselection by mobile station in a cellular mobile radio network with a plurality of layers of cells includes, when the station is in a standby state and after selection of a cell by the station, identification of a layer containing the selected cell, reselection of cells in the layer during a predetermined time-delay, cumulative counting of the number of cells reselected in the layer during that time-delay, and comparison of the cumulative number with two thresholds. The reselection, cumulative counting and comparison steps are repeated if the cumulative number is between the thresholds. Otherwise, a change of layer is effected on the basis of the comparison and the previous steps are repeated, starting from the identification step. The mobile station selects the layer most appropriate to the speed at which it is travelling.