Abstract: In a telephone system, which is arranged by a parent telephone unit and a plurality of child telephone units capable of radio-communicating with the parent telephone unit, the parent telephone unit includes a telephone number data storage table for storing a plurality of telephone number data indicative of a plurality of telephone numbers commonly usable by the plurality of child telephone units. The parent telephone unit retrieves the telephone number data storage table in response to a telephone number retrieve command issued from each of the plural child telephone units, and outputs a retrieve result to such a child telephone unit which has issued the telephone number retrieve command. Each of the plural child telephone units issues the telephone number retrieve command as a retrieve command issuing child telephone unit.

Abstract: A free channel double checking protocol and system are disclosed. More particularly, the system includes at least one primary radio station and a plurality of secondary radio stations, in which a secondary radio station is matched to a primary radio station and a wireless communication is established via a full duplex communication link. The primary and the secondary stations establish the communication link using a free channel double checking protocol. The free channel doubles checking protocol checks whether a free channel exists between stations. After setting up the communication link, a calling station may confirm to a called station that a reliable communication link has been established.

Abstract: A cellular telephone system for use in an aircraft (12) comprises a plurality of user terminals distributed throughout the seating array, each group of terminals being connected through short cables to an optical/RF transducer (30) which is linked through an optical fibre array (50) to a further transducer (26) connected by short cables (27,28) to a Base Transceiver Station (22).

Abstract: Communication links are quickly and reliably established between units of a cordless telephone configured for operating in a frequency hopping system. This is achieved through specific processes which detects frequency hopping patterns that are embedded in radio frequency noise. A first process is executed by the base unit and/or each of multiple handset units in the cordless telephone for performing a link acquisition with another unit, also in the cordless telephone. In the execution of this process, multiple profile scans of the frequency hopping channels are executed to build up over time tables with information about energy in all of the channels in the frequency spectrum that are used by the units in the cordless telephone for frequency hopping. In the tables will be spectrum energy from a frequency hopping base unit or handset unit that appears as a recognizable pattern.

Abstract: A decline in effective data transmission speed and interference between adjacent channels are prevented in a wireless telecommunication system. A hopping pattern used in direct communication between wireless telecommunication terminals is stored in the wireless telecommunication terminal, and communication is performed upon synchronizing a hopping pattern used in communication via a main unit and the hopping pattern used in direct communication between wireless telecommunication terminals.

Abstract: A cordless telephone system achieves synchronism for each one of multiple portable units to the same communication channel for communicating with a common base unit. The cordless system uses a dual channel process to allow both the freedom to dynamically change channels as needed to avoid interference while simultaneously providing a capability to resynchronize any portable unit with the base unit on a selected active channel. This is achieved through the use of a fixed service channel and an active channel which changes as needed. If a channel change is made during a call, after the call is completed, the base unit returns to the previous active channel and broadcasts a message to the multiple portable units indicative of the new active channel. Also, any portable unit that attempts to communicate with the base unit on the wrong channel and fails to get a response will transmit a message on the fixed service channel requesting the current active channel from the base unit.

Abstract: To install a virtual private network (VN) within a given mobile-radio network (MRN), a facility is proposed which is connected to the base stations (BS) and controls the establishment and release of calls between mobile subscribers (MS1. . . MSX) assigned to the coverage area of the base stations, and a data base (HLR) connected to the facility, which contains a subscriber data set (DS) for each of said mobile subscribers with a first logic data set (LDS) for registering them as subscribers of the mobile-radio network. Each of some of these mobile subscribers (MS1, MS2, MS3) has a second logic data set (LDS-VN) for registering them as subscribers of a virtual private network. In this way, in addition to the data set (LDS) allowing access to the mobile-radio network (MRN) as such, the invention adds to the subscriber data set in the existing data base (HLR) a further data set (LDS-VN), which enables a mobile subscriber to access a virtual private network (VPN).

Abstract: To implement a radio system (PRS) for a closed user group by simple means and at low cost, a device (MONE) is proposed which connects at least one commercially available base station (BTS1, BTS2) to a telecommunication network (PSTN) via standard interfaces (PCM30, Abis). The device comprises a subscriber data base (ID) and means (MM) for checking whether a transmitted subscriber identification (IMSI) authorizes a subscriber to access the radio system (PRS). The device further controls the establishment and release of calls (CC) and performs radio resource management functions (RR). A radiotelephone (MS) authorized to access the radio system (PRS) is connected to the nearest base station (BTS1) at least for the duration of the call.

Abstract: A telephone having a speaker, microphone, processor, control unit, inhibit unit, and audible indicator. When the telephone is used to communicate conventionally with another telephone, for example to enable respective users to speak to each other, electronic signals corresponding to the speech are transmitted to and received by the telephone at an input and output, respectively. The processor electronically processes the signals. Signals from incoming calls are relayed from the input to the speaker, and signals from outgoing calls are relayed from the microphone to the output. The control unit identifies the presence of a command signal with the incoming calls. If a user of another telephone wishes to call the telephone, the user dials the number of the telephone in the conventional way.

Abstract: A system in which a private base station supports the registering of multiple mobile stations and generates a personalized call delivery feature for each registered mobile station is provided. Each mobile station registers separately with the base station when within communication range of the base station. When registration of a mobile station with a private base station is performed, the private base station generates a local unique address for each one of the multiple mobile stations registering with the private base station. This unique address for a registered particular mobile station is also sent to the private base station location register.

Abstract: In a radio communication system including at least one radio base station and at least two telephones connected to a radio terminal, simultaneous multiple calls may be set up between the radio base station and the radio terminal. An adaptor connects the telephones to the radio terminal that is connected over a radio air-interface to the radio base station. For an outgoing call originating from one of the telephones, the adaptor senses when a particular telephone goes off-hook and signals this information to the radio base station via the radio terminal and a control channel of the radio air-interface. Then, a first traffic channel is set up between the radio base station and the radio terminal. The telephone that has gone off-hook is connected to the established traffic channel via an adaptor. Once a first traffic channel is established for a first call, signalling that a second call is to be set up may be transmitted across the first traffic channel without terminating the first call.

Abstract: A method and apparatus provides an indication of active handsets in a cordless telephone system (100). A user enters an inquiry (204) using either a handset (104) or the user interface (120) of the base station (102). The base station (102) pings or queries (210) each registered handset (106, 108, 110, 112) to establish a list of active handsets. The list of active handsets is then transmitted (228) to the handset (104) from which the inquiry was received or is displayed using the user interface (120) of the base station (102). This permits the user to learn what other users are actively registered with the base station (102) for call forwarding, intercom operation or for use of any other user convenience features of the cordless telephone system (100).

Abstract: Concurrent receipt of incoming calls from both a private radio communications network connected to a public switched telephone network and a wide area cellular network also connected to the public switched telephone network are provided by a radio communications mobile terminal supporting concurrent receipt of incoming calls from the two uncoordinated networks. The mobile terminal wakes up from a lower power sleep mode to monitor for paging messages on the paging channel of the wide area cellular network. The mobile terminal also wakes up to monitor for beacon transmissions from the private radio communications network on the beacon channel of the private radio communications network. When incoming calls are indicated as pending in either network, the mobile terminal accesses the network having an incoming call and receives the call.

Abstract: A private mobile communication system serves to support communication between mutual portable or mobile radio telephone equipment which are registered in the system, and communication between the portable or mobile radio telephone equipment and a telephone connected to a public network. A portable or mobile radio telephone equipment which is not registered in the system transmits a request for call to the public network through a private control channel controlling section. A radio base station in the system transfers the request for call transmitted through a private channel to a PBX. The PBX serves to support the call to the public network in response to the request for call transmitted through the private channel.

Abstract: A user headset is provided that is operable to contain an audio device (50) and a receiver (52). The receiver (52) is operable to receive both audio information on multiple channels and also data. The data is received in the form of pulse width modulated sync signals. The sync signals are operable to provide a synchronization signal for 3-D liquid crystal lenses (60). The data is encoded within the sync signal through pulse width modulation. The width of the pulse defines various commands. These various commands define the channel over which the audio is to be transmitted. These channels can either be user-defined or they can be a function of the transmitter. The transmitter includes an audio generator (42) for generating audio signals on multiple channels and also a data generator (40). These are modulated onto a broad band optical signal and transmitted via an IR data link.

Abstract: Disclosed is a telecommunication system that is both highly cost effective for small scale applications (for example, those having less than 80 lines), yet field upgrade-expandable to applications having a significant number of additional lines (for example, 30,000 lines). An integrated voice/data telecommunication system is utilized that is flexible enough to handle low bandwidth (for example 64 kbps mu-law) speech as well as high bandwidth multimedia data switching. The system may be configured as a low cost, standalone PACS system for "village telephony" or "PACS-on-POTS" applications, as an alternative to requirements for PACS infrastructure when appropriate wireless network facilities are unavailable.

Abstract: In a mobile communications system each radio unit (14,16) is associated with a respective base station (12) as its `home` base station; any radio unit can communicate with any base station in whose service area it is located. Each base station has a radio interface (20) for communication with radio units, a telephone interface (24) for connection to a telephone line, for example via a PABX (44), and a LAN interface (28) for connection to a local area network (40) to which all the base stations are coupled. Voice communications for a handset are always routed through the home base station for that handset, e.g. to another handset or to the PABX, irrespective of the identity of the base station in whose service area the handset is currently located.

Abstract: A cordless telephone system has plural interfaces which communicate with plural terminals by radio signals. The radio signals include a calling signal from a calling terminal. A selector coupled to the plural interfaces selects a group of interfaces to be connected to the calling terminal according to an identifier in the calling signal that identifies the calling terminal.

Abstract: A communications system for establishing radio transmission and reception between one or more base units and one or more portable units. Upon reception at a base unit of an incoming call a first callout signal is transmitted to one or more portable units by the base unit. This first call out signal does not contain any information about operating a ringing device located in each portable unit, however, when the sequence signal from the first portable unit to respond to the callout signal is received by the base unit, the base unit sends out a second callout signal. This second callout signal contains information which starts a ringing cadence off, at the beginning of the cadence, in the ringing device in the first portable unit to respond and thus there is always only a small delay between a base unit and a portable unit making contact and the portable unit beginning to ring.

Abstract: A radiotelephone system comprises plural sub units, and a main unit for communicating with the plural sub units. The main unit of the radiotelephone system comprises a first transmitter for transmitting radio signals to the sub units, a first receiver for receiving radio signals from the sub units, chief sub unit determining means for determining the chief sub unit to make radio communications out of the plural sub units, and first communication establishing means for establishing the communications with the chief sub unit determined by the chief sub unit determining means by controlling the first transmitter and second receiver.