WO1999055102A1 - Method and system for providing cellular communications services - Google Patents
Method and system for providing cellular communications services Download PDFInfo
- Publication number
- WO1999055102A1 WO1999055102A1 PCT/IL1999/000214 IL9900214W WO9955102A1 WO 1999055102 A1 WO1999055102 A1 WO 1999055102A1 IL 9900214 W IL9900214 W IL 9900214W WO 9955102 A1 WO9955102 A1 WO 9955102A1
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- WIPO (PCT)
- Prior art keywords
- mobile
- cellular
- location
- switching center
- services
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
- H04M19/045—Call privacy arrangements, e.g. timely inhibiting the ring signal
Definitions
- the present invention relates generally to mobile telephone systems. More particularly, the present invention relates to a method for location of cellular network subscribers, and providing or denying cellular communication services based on subscriber location. The location of a mobile telephone within the geographic serving area of a mobile telephone systems is determined, and the system enables various services based on a defined geographic service scheme.
- Mobile telephone systems also referred to as cellular telephone systems, have become increasingly popular. These systems are generally made up of cell sites, each of which serves a coverage area, or cell.
- the cell site is the location within a cell which contains the required hardware (e.g. antenna(s) and radio base station) to communicate with the mobile telephones.
- a mobile telephone operating within a particular cell in the system communicates with the mobile telephone system through the cell site covering that cell.
- the various cell sites are connected to a Mobile Switching CenterMobile Switching Center which connects the mobile telephone system to the land-line telephone network.
- preventing use of cellular mobile phones may be implemented by transmitting a jamming signal on the control channels frequencies transmitted by the cellular system, thereby disabling the mobile unit from communicating with the cellular system.
- the jamming method for enforcement of cell-phone usage policy has several drawbacks.
- precise control of electromagnetic radiation is a complex and expensive task.
- Various countries have prohibited use of jamming equipment.
- the present invention provides a method and system for enabling cellular communication services respective to several parameters, such as the current location of the mobile unit, time, and other attributes rendered to subscribers.
- the cellular system receives data regarding the mobile unit's location.
- the cellular system includes a location management unit comprising computer hardware and software to determine the type of service applicable in accordance with the subscriber's current location and profile and time of day.
- the management unit may be operated at the Mobile Switching CenterMobile Switching Center, or at the different base stations.
- An objective of the invention is to provide a method and system for providing cellular communication services respective to user location and profile. In accordance with the premises management usage policy.
- Another objective of the invention is to enable cellular operators to provide selective services to cell-phone users visiting in different locations such as hospitals, airplanes, cinema halls, military bases or otherwise secure locations etc.
- the cellular operator may provide only silent messaging to users who have entered a cinema hall, and may not provide any services to users who have entered a hospital, so as to prevent electromagnetic interference, or to users who have entered a secure facility in order to prevent compromise of premises security.
- a front-end module is placed within a controlled area and reports to the cellular system which subscribers are located in the controlled area.
- the front-end module increases the accuracy of other means for locating the position of cellular subscribers where the cellular system incorporates additional location capabilities.
- the cellular system receives the location of the subscriber without any special action on the part of the mobile telephone or the mobile telephone user.
- a clone base station front-end positioned in the regulated area communicates with mobile cell-phones in the area, thereby controlling cell-phone's availability and operation mode.
- a signaling device activated in the regulated area, transmits a beacon signal, which is received by mobile phones located in said regulated area.
- a beacon signal which is received by mobile phones located in said regulated area.
- relevant subscribers are marked as located within the regulated area and can be denied services if so required.
- the mobile phone receives a signal from a local transmitter and relays said signal to a management system via the cellular switching center.
- the management system identifies the said signal's properties and extracts the mobile phone's location by processing various parameters related to said signal.
- a mobile phone incorporating a short range local transceiver , such as an infra-red transceiver or a Bluetooth compliant transceiver or a HomeRF compliant transceiver, the mobile phone receives a signal from a local transmitter and relays said signal to a management system via the cellular switching center.
- the management system identifies the said signal's properties and extracts the mobile phone's location by processing various parameters related to said signal.
- a mobile phone incorporating a short range local transceiver such as an infra-red transceiver or a Bluetooth compliant transceiver or a HomeRF compliant transceiver, communicates with corresponding transceiver thereby communicating with a local management system which enables a variety of services based on subscriber identity.
- a short range local transceiver such as an infra-red transceiver or a Bluetooth compliant transceiver or a HomeRF compliant transceiver
- FIG. 1 is an illustrative diagram describing a typical cellular system composed of 7 cell sites, each having a base station incorporating a transceiver.
- FIG. 2 is a functional diagram illustrating the components of a cellular system included in one embodiment of the present invention.
- FIG. 3 shows a cellular telephone system regulated area location system in accordance with one embodiment of the present invention.
- - 6 O 99/55102 PCT/IL99/00214
- FIG. 4 is a block diagram of one preferred embodiment of the location system digital signal processing.
- FIG. 5 is a flow diagram illustrating the steps performed by the present invention when a mobile user originates a call.
- FIG. 6 illustrates the operation of a beacon device for location determination purposes.
- FIG 7 is a flow diagram illustrating the typical steps performed by a management system in accordance with the present invention.
- FIG. 1 illustrates a basic cellular system having 7 hexagonal cells numbered 1-7.
- Cell 7 is shown in the center, surrounded by adjacent cells 1-6.
- the serving area of a mobile telephone system would typically contain more than 7 cells, however, for ease of reference, only 7 cells are shown in FIG. 1.
- Each cell 1-7 contains a base station including a transmitter, receiver and base station controller as are well known in the art.
- the base station transmitter/receiver is connected to an antenna tower 11-17 which is used to transmit signals to, and receive signals from, mobile telephones, within the mobile telephone system serving area.
- the base stations antenna towers 11 - 17 are selected to be located at the center of each of the cells 1-7, respectively and are equipped with Omni-directional antennas.
- the base station towers 11-17 may be located near the periphery, or otherwise away from the center of the cells 1-7 and may illuminate the cells 1-7 with radio signals either Omni-directionally or directionally. Therefore, the representation of the cellular radio system of FIG. 1 is for purposes of illustration only and is not intended as a limitation on the possible implementations of a mobile radio communications system within which a regulated area is defined for the purpose of locating subscribers and providing location oriented services.
- a regulated area 10 is located within cell 7, and a plurality of mobile units are used across the entire serving area within cells 1-7. Again, only one regulated area is shown in FIG. 1 , but it should be understood that the actual number of regulated areas can be larger, in practice.
- Each cell 1-7 has assigned to it a plurality of voice or speech channels for transmitting and receiving voice signals, and at least one access or control channel for transmitting control data signals, such as a forward control channel, and receiving control data signals from the mobile units, such as a reverse control channel.
- control data signals such as a forward control channel
- control data signals from the mobile units, such as a reverse control channel.
- Control and administration messages within a cellular radio system are sent in accordance with industry established air interface standards, such as AMPS and EIA/TIA 553, the standards for analog cellular operations, and/or D-AMPS, IS-54 and IS-136, the standards for digital cellular operations, all of which are hereby incorporated by reference herein. Similar standards such as IS-95 for Code Division Multiple Access (CDMA) and Global System for Mobiles (GSM) govern other geographic areas throughout the world, and are well known to those skilled in the art.
- CDMA Code Division Multiple Access
- GSM Global System for Mobiles
- the mobile unit 22 is a digital mobile telephone which operates according to the North American Time Division Multiple Access (TDMA) system IS-55 standard, and the air interface is described by the IS-54 and IS-136 standards. See, EIA/TIA Interim Standard IS-54-B "Cellular System Dual-Mode Mobile Station-Basestation Compatibility Standard", April, 1992; EIA/TIA Interim Standard IS-136 " Cellular System Dual-Mode Mobile Station-Basestation: Digital Control Channel Compatibility Standard", April, 1995.
- Each cell 1-7 within the mobile telephone system serving area contains a cellular base station antenna tower 24 which is connected to the Mobile Switching Center 25.
- cell 7 is the serving cell since the voice data is being communicated through that cell.
- the mobile unit 22 In addition to the communication with the serving cell, the mobile unit 22 also monitors the control channels of nearby cells. - 9 - O 99/55102 PCT/IL99/00214
- the information exchanged between base stations and mobile units via messages may include incoming call signals, outgoing call signals, paging signals, paging response signals, location registration signals, voice channel assignments, maintenance instructions and handoff instructions as the mobile units travel out of the radio coverage of one cell and into the radio coverage of other cells, as well as other additional items of information such as calling party numbers, time information and the like.
- the control or voice channels may operate in either analog or digital mode or a combination thereof based upon industry standards.
- the regulated area 21 is located within the coverage area of the cell site.
- the mobile unit 22 shown within the regulated area communicates with the cellular base station 24 via an air interface.
- a front-end module 23 is installed within or near the regulated area 21. The front-end module monitors the radio messages transmitted by the mobile unit 22 and determines if the unit is located within the regulated area.
- the front-end module 23 communicates with the cellular base station 24 via the reverse control channel or any other communications means, and notifies the Mobile Switching Center 25 of all mobile units currently located within the regulated area.
- the Mobile Switching Center 25 includes a service management unit (SMU) 26.
- the SMU includes software that runs and updates a database of all cellular subscribers current location and profile. And a data resulting in a digital map of regulated areas.
- the data received from the front end is compared to data from other sources, in order to improve the accuracy of the location coordinates. Thus it is determined whether the user is actually inside the regulated area.
- the SMU determines what services are currently available to each user. Whenever a mobile unit located within a regulated area requires service from the cellular system (e.g. initiates or receives a call), the Mobile Switching Center checks the user database if such service conforms with the defined usage policy. Usage policy in regulated areas may differ in accordance with the Mobile
- MIN Identification Number
- ESN Electronic Serial Number
- a disclosure includes an optional method and system for locating subscribers within defined areas.
- the describes location method may be used in addition to other location methods and systems in order to provide subscriber positioning services, and may not be required where the cellular system is able to derive accurate enough positioning data.
- FIG 3. illustrates one embodiment of the present invention wherein a defined regulated area 31 are one or more mobile units. Only one mobile unit 32 is shown in FIG. 3, but it should be understood that the actual number of mobile units may be larger. The presence or absence of mobile units in any particular regulated area should be understood to depend, in practice on the individual desires of subscribers utilizing the mobile units.
- a plurality of mobile units, such as mobile unit 32 shown in FIG. 3 are used outside the regulated area 31.
- a front end unit 34 is located within or near the regulated area 31. The front end unit 34 incorporates an array of receiving antennas 35 comprising a plurality of antennas separated from each other so as to enable accurate intersection of the signals transmitted from the mobile units nearby the regulated area 31.
- FIG. 3 illustrates one embodiment of the present invention wherein a defined regulated area 31 are one or more mobile units. Only one mobile unit 32 is shown in FIG. 3, but it should be understood that the actual number of mobile units may be larger. The presence or absence of mobile units in any particular regulated area should be understood to depend
- three receiving antennas 36-38 are utilized to determine the location of a mobile unit 32. While three receiving antennas 36-38 are utilized in the illustrative example of FIG. 3, it should be understood that a different number may be utilized in practice.
- the present invention monitors all messages transmitted by the mobile units located in the vicinity of regulated area 31 vis-a-vis the antenna array 35 connected to the front end unit 34. By measuring signal strength, propagation delay, or both from each of the receiving antennas 36-38, the distance of the mobile unit 32 from each antenna is calculated. Arcs of possible locations of the mobile unit are then derived from the calculated distances. Well known geographical intersection techniques such as triangulation, arculation, probability - 11 - O 99/55102 PCT/IL99/00214
- the front end unit 34 converts the measured signal strength, propagation delay, or both from each of the antennas 36-38 into digital format and transmits the measured values to a nearby base station 39.
- all measurements from various base stations are relayed to the Mobile Switching Center, wherein a processor unit 30 calculates the location of all mobile units in the vicinity of regulated areas wherein a front end unit is installed.
- the location of the processor unit may be either within the front end unit 34 or within the base station 39 as well as the Mobile Switching Center 30.
- Preferred embodiments of the present invention make significant use of digital signal processing techniques.
- Such techniques entail the use of appropriate forms of sampling and conversion hardware to convert analog radio frequency signals into sampled digital data forms. These techniques are widely known in the art, and are capable of performing many functions traditionally implemented using analog components.
- the advantage of using digital signal processing includes better control of noise during conversion, sampling, and filtering; and exact replication of these functions from each receiving antenna. Since the front end unit serves as a conversion facility to digital signals, it becomes technically immaterial where the actual processing is performed. Thus, the digital measurements can be processed either within the front end unit or at any other location such as a base station or the Mobile Switching Center.
- the actual location of the processor is a cost tradeoff involving the cost of digital signal processing subsystems and the cost of transferring the raw digital measurements from the front end units to the Mobile Switching Center.
- FIG. 4 illustrates a typical location technique disclosed in U.S. Patent No. 5,608,410 to Stilp et al entitled "SYSTEM FOR LOCATING A SOURCE OF BURSTY TRANSMISSIONS CROSS REFERENCE TO RELATED APPLICATIONS", which is inco ⁇ orated by reference herein. It should be noted that the present invention is not limited to the Stilp method and any other - 12 - O 99/55102 PCT/IL99/00214
- the front end unit is made up of an elevated ground-based antenna array comprising three antennas receives transmissions from mobile units over the reverse control/access channel, typically of the nearest cell site. Signals received by each antenna are fed into a sampler 41, which converts the sampled signals into frames of digital data at a prescribed sampling frequency. Each frame of data comprises a prescribed number of data bits and time stamp bits that represent the time at which the responsive signal was received. Baseband converters 42 receive the sampled signals and provide a baseband signal derived therefrom. A multi-antenna processor 43 combines and distinguishes the signals received from the individual antennas in the antenna array, and then provides a single representation of a signal for further processing.
- a transmission demodulator 44 determines the demodulated data content of the responsive signal, where the demodulated data content includes information identifying the mobile unit, possibly its electronic serial number (ESN) and/or mobile identification number (MIN).
- a database subsystem 45 determines how and whether a responsive signal should be stored for further processing, or whether it should be discarded.
- a signal processor 46 extracts selected signal characteristics from the frames of digital data, such as timing, power, frequency and phase.
- a data reduction and forwarding subsystem 47 selects and compresses the data frames before transmission over communications facilities to the central site (Mobile Switching Center).
- a timing module 48 determines a synchronization signal common to all the antenna site components. The system is self-calibrated by a calibration module 49 which determines and corrects changes in delay, frequency and phase of various site components.
- FIG. 5 is a flow diagram illustrating the steps performed by the SMU when a mobile phone subscriber originates a call when located in the regulated area.
- the system begins in FIG. 5 at step 51 where a user originates a call to a land subscriber. As the user's request for service is received, the system moves to step 52 and checks the user's position ,and optionally updates it with new data.
- the SMU determines the accuracy of the user's location. If the system determines that the user's location is not sufficiently accurate then the system moves to step 57 and provides the default level of service or a level of service defined for inaccurate positioning in the vicinity of the regulated area . If it is determined that the user's location is accurate the system proceeds to step 54 and determines the defined usage policy for the user's location. If at step 54 it is determined that the user's current location is not defined as having a specific usage policy then the system moves to step 57 and provides the default level of service.
- step 54 it is determined that the user's current location has a defined usage policy then the system proceeds to step 55 where it is determined if the said user (or user group) has a specific permission which overrides the general definitions of the level of service available in the regulated area. If at step 55 it is determined that the user has a specific permission, then the system moves to step 58 and provides the level of service designated to said user. If, however, at step 55 it is determined that said user does not have a specific permission, then the system proceeds to step 56 where the service rendered to the user is determined in accordance with the usage policy defined to its current location. The steps illustrated in FIG. 5 are followed both when the service is initiated by the mobile user or when the user is totally passive and the call or message is initiated by another subscriber, whether mobile or land based.
- Table 1 describes a basic usage policy database for a cellular system in accordance with one embodiment of the present invention.
- Line 1 sets the basic rule - all subscribers are allowed access to all services at all time.
- Line 2 denies all cellular services from all subscribers located within the hospital at all time.
- Lines 3 and 4 limit all subscribers located at the concert hall (except 245677) to SMS services only during the concert time (22:00-24:00).
- Line 9 provides additional services to User 518603 when located in the company factory area, including wider bandwidth for network connection and video conferencing, better quality of service, reduced price, conference call service etc. 14 - O 99/55102 PCT/1L99/00214
- the availability and price of additional services may be determined respective to MIN and user profile definitions versus, user current location and regulated areas database.
- areas such as co ⁇ orate office buildings are divided into sections.
- the SMU manages communications services and resources according to user location.
- the SMU receives user location data as described, and sends commands to the
- Mobile Switching Center and other subsystems of the cellular network, to determine the services to be provided to users in the designated location.
- SMU may also manage and control the availability of resources managed by the co ⁇ orate - 15 - O 99/55102 PCT/IL99/00214
- the SMU In order to control availability of resources managed by the co ⁇ orate, the SMU typically communicates via the cellular telephone network with a resource management unit at the co ⁇ orate office building. For example, the SMU detects the presence of a specific user in the office and (1) signals to the computer via the wireless network to grant/deny access to computer applications, networks and files and determines database permissions; (2) Similarly, by communicating with a control unit, by means of wireless modem, the SMU enables or disables specific auxiliary services and resources available in said designated area, such as managing availability of equipment, printers, lab equipment , communication and video conferencing utilities etc; (3) The SMU, via wireless network and control unit at the co ⁇ orate end ,equipped with wireless modem, may allow/deny physical access to specific rooms;(4) grant/deny access to classified information in physical cabinets; (5) determine employee presence at the office and perform time logging; (6) and broadcast general messages pertinent to users in specific locations, such as messages regarding fire alarm, security alarm etc.
- the Services Management Unit (SMU) software typically located at the Mobile Switching Center may be located in the regulated area and communicate with cellular network Mobile Switching Center or base stations as required.
- SMU Services Management Unit
- the presence of the cell-phone in the regulated area may also be established by detecting the cell-phone using a positioning front end as a registry at the entrance, corridor, or gate to the regulated area.
- the SMU will than extract a database of the actual position of the cell-phone users at any given time according to the gates - 16 - O 99/55102 PCT/IL99/00214
- selective, location orientated control of cellular services is achieved by positioning a phantom base station in the controlled location.
- the phantom base station simulates base station signaling in order to communicate with the mobile phones in the location.
- the mobiles in the controlled location receive the clone signaling from the nearby transmitter at a superior signal to noise ratio, and respond to the clone signaling rather than to the actual cellular system base station, the clone station simulates signaling respective to the required control and limitation of cellular services in the controlled area.
- the clone station is capable of performing cell-phone registration, transmitting protocol signals that disable all mobiles from receiving incoming calls, and transmitting protocol signals that disable selected services only.
- said base station as a singlr board inserted into a Personal Computer's expansion slot or in part by using the PC's main processing unit, so as to enable cost effective design, minimum power requirements, easy to use interface and integration with the PC operating system providing numerous advantages .
- Such implementation can benefit from the PC's resources such as Hard disk and Internet Local Area Network and phone line connectivity.
- a clone station receiver enables simulated communication with cell-phones.
- the receiver enable the clone station to recognize cell-phones with specific Mobile Identification Numbers (MINs), predefined in the clone station database, referring these selected users to use the actual base station operating in that area.
- MINs Mobile Identification Numbers
- the selected users will still receive regular cellular services, and will be capable of receiving incoming calls and other services.
- a method for determination of the location of a mobile subscriber is presented, by which a Mobile Switching Center (MSC) is able to determine that certain cell-phones or Mobile Stations (MS) are located within a - 17 - O 99/55102 PCT/IL99/00214
- MSC Mobile Switching Center
- MS Mobile Stations
- the method involves transmission of a low power signal or signals in the spectrum in which the base station signals are transmitted (e.g., 935 - 960 MHz for GSM, or 869-894 MHZ for IS 136).
- This signal will be received by an MS close to the transmitting device (within the area defined).
- the MS then transfers information pertaining to this signal to the Base Station (BS), and the MSC.
- the MSC Location Software uses a database of the signals received in each covered area, analyses the signals received by the MS, and calculates the MS location.
- the MLS is able to determine the location of the MS according to the transmissions received from it.
- the MS location calculated by the MLS is 'functional' or 'logical', and not limited to geographical coordinates or area.
- the beacon is set to transmit a weak signal received only within a concert hall.
- the MLS learns which mobile stations receive the signal and in turn concludes which MS are within the concert hall
- the MLS instructs the MSC which services to provide to the MS in that given area .
- MSC may provide only Short Messaging Services.
- the MS exists the regulated area
- the signal transmitted by the beacon or phantom base station is attenuated , and is not received in an adequate level by the MS.
- the measurements performed by the MS and forwarded to the cellular network vary according to cellular standard specifications. For instance, IS-136 handsets measure RSSI and/or BER based on the channel being measured. GSM handsets report a list of six strongest non-serving BCCH channels received.
- the exact type of beacon signal varies in order to conform to the handsets, with which the beacon interacts. Beacon signals conform to system measurements and reports executed as per the respective standard.
- any transmission which will result in specific data reported to the BS and MSC e.g. list of frequencies or a list of control channels received by MS, and signal measurements and parameters, as described in GSM 04.08
- any transmission resulting in a pattern in the reports received by the MSC e,g. transmission of a very weak jamming signal - 18 - O 99/55102 PCT/IL99/00214
- the pattern being identifiable by the MLS may be used.
- the detection of the beacon signal (or signals) by the MS is made within the handset by using Mobile Assisted Hand-Off (MAHO) functions, such as those implemented by IS-136 cellular systems and GSM.
- MAHO Mobile Assisted Hand-Off
- the MAHO function requires a mobile station to furnish RF-channel signal quality information to its serving base station.
- a detailed description of the MAHO function can be found in TIA/EIA/IS-136.2-A section 2.4.5.
- an MS uses MAHO to establish a dynamic table of control channels of adjacent cellular base stations and their respective received signal strength levels.
- the MAHO list is typically used to select the best suitable cell, to which an MS will perform handoff upon radio link degradation with current serving cell.
- the MS updates the cellular system of changes in the MAHO list.
- a phantom base station transmits control channel signaling on a frequency not used by the base stations received in the regulated area.
- the transmission power is calibrated so as to be received within a certain distance from the phantom base station, in which the use of cell-phones is to be regulated (e.g. 10 mWatt).
- the phantom beacon signal represents a phantom cell
- the beacon channels correspond to the MLS database.
- the MLS associates MAHO list patterns with typical areas and service policies.
- the MLS The MLS identifies the channels at which the phantom base station is transmitting among the frequencies listed in the MS message, and determines that the relevant MS is within the designated regulated area. Further parameters may be inco ⁇ orated into the beacon signal, where applicable. For example, a base station's ID number may be used to enable the MS to relate a certain mobile station with a specific location.
- FIG. 6 describes a geographical area covered by several base stations. Part of this area, typically limited by walls is to be defined as a regulated area 60 in which, at certain times, only certain services are to be provided, and others are to be denied. - 19 - O 99/55102 PCT/IL99/00214
- beacon frequencies Fdl and Fd2 are transmitted by phantom base station 64.
- Three base stations 61-63 are dispersed in the area. Two mobile stations are being used, 65 is inside area 60 and mobile station 66 is outside that area.
- Beacon transmitter 64 transmits one or more beacon frequencies (e.g., Fdl and Fd2). Each of the base stations transmits a control channel frequency F1-F3.
- MS 66 will report frequencies of the adjacent base stations: FI, F2 and F3 (In this approximate order).
- MS 65 inside area 60 report will be: FI, F2, F3, Fdl and Fd2.
- the phantom beacons signals Fdl and Fd2, which are weak, and detected or received at a minimal signal strength only by MS 65 due to the proximity thereto and the RF attenuation provided by the boundries of area 60.
- MS 66 will not receive signals Fdl or Fd2 and will not include those channels in its adjacent cell list.
- MS 66 receives signals Fdl or Fd2 and includes them in the MAHO list
- the MSC which receives a MAHO message, The MLS can then determine that MS 65 is located inside the area 60, and instruct the MSC to handle it according to predefined rules.
- the MSC includes a user database such as in Table 1 , which further comprises a database of regulated areas wherein phantom channels are transmitted.
- the list Upon receipt of a MAHO message by the MSC the list is transferred to the MLS which compares the MAHO list, with a mask of phantom frequencies, which would not have been received inside or outside a given area.
- the phantom frequency selection should be made in conjunction with the said cellular system frequency re-use plan, while making sure that phantom beacon channels do not interfere with normal cellular communication services.
- the beacon transmitter device typically implements the transmit path of a cellular base station, which is well known to those skilled in the art.
- a single carrier frequency cellular base station design is disclosed in U.S. Patent No. 5,812,955 to Dent et al entitled "BASE STATION WHICH RELAYS CELLULAR VERIFICATION SIGNALS VIA A TELEPHONE WIRE NETWORK TO
- location method described herein can be utilized in order to enhance other location systems such as E911.
- a mobile phone which is configured to receive a signal or set of signals transmitted from nearby transmission devices.
- the mobile phone is further configured to relay said signal to the MLS so as to enable the latter to process the information and derive said mobile phone's location.
- the configuration change of the mobile station may be implemented by changing the system software executed by the mobile station's micro-controller or when applicable, by downloading the appropriate software into the Subscriber Identification Module (SIM).
- SIM Subscriber Identification Module
- GSM SIM card may be in accordance with the SIM Toolkit standard, as defined in Digital cellular telecommunications system (Phase 2+); Specification of the SIM application toolkit for the Subscriber Identity Module - Mobile Equipment (SIM - ME) interface (GSM 11.14 version 5.9.0 Release 1996).
- SIM Toolkit standard, as defined in Digital cellular telecommunications system (Phase 2+); Specification of the SIM application toolkit for the Subscriber Identity Module - Mobile Equipment (SIM - ME) interface (GSM 11.14 version 5.9.0 Release 1996).
- SIM - ME Subscriber Identity Module - Mobile Equipment
- Such implementation may involve modification of the handset system software so as to monitor a predefined local transmission during discontinuous reception (DRX) intervals intended for low battery consumption.
- DRX discontinuous reception
- the received signal may then be used by the SIM application and/or forwarded to the MLS through any transport mechanism such as SMS.
- a mobile station inco ⁇ orates a short-range transceiver that uses either infrared or spread spectrum transmission such as Bluetooth or HomeRF Shared Wireless Access Protocol (Cordless Access).
- a mobile station communicates with a local management system via said short-range transport means, while enabling the local management system to render services depending on the identity of a particular subscriber and/or other parameters stored in the mobile station's memory.
- Such services may include control over various appliances, access control to doors, cabinets, safe storage spaces, network access, computer workstation user verification etc.
- the mobile handset's operating software can be further configured to perform certain actions upon receiving commands from a local management system through a short-range transport mechanism. Such commands may include speaker mute, MS shut down, switch from ring to vibrate mode etc.
- a messaging center is inco ⁇ orated into the Service Management
- SMU Subscriber Unit
- a mobile subscriber When a mobile subscriber is located within a regulated area and the usage policy defined for said subscriber denies voice communications, the user is normally unavailable. Subscribers having voice mail messaging services can route the incoming call to their personal mailbox. However, subscribers who do not have voice mail messaging remain unavailable.
- the present invention inco ⁇ orates an autonomous messaging system, intended for cellular subscribers who do not have a personal mailbox.
- the messaging system enables the caller to leave a message in a temporary mailbox.
- the non- voice mail cellular subscriber departs the regulated area, the messaging system calls the non- voice mail cellular subscriber and notifies him that one or more messages are available for him.
- the charges for the messaging service may be billed to the calling party, at his consent.
- the voice mail message may be handled by the non-voice mail cellular subscriber as a collect call, which has to be specifically accepted in order for billing to take place.
- the messaging system presented herein may provide services for voice, fax, data and video.
- the messaging system may be implemented within a wireline telephony system.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99914742A EP1074156A4 (en) | 1998-04-22 | 1999-04-22 | Method and system for providing cellular communications services |
AU33437/99A AU3343799A (en) | 1998-04-22 | 1999-04-22 | Method and system for providing cellular communications services |
AU39866/00A AU3986600A (en) | 1999-04-22 | 2000-04-23 | Method and system for providing location specific services to mobile stations |
PCT/IL2000/000236 WO2000065731A1 (en) | 1999-04-22 | 2000-04-23 | Method and system for providing location specific services to mobile stations |
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Application Number | Priority Date | Filing Date | Title |
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US8261898P | 1998-04-22 | 1998-04-22 | |
US60/082,618 | 1998-04-22 |
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WO1999055102A1 true WO1999055102A1 (en) | 1999-10-28 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IL1999/000214 WO1999055102A1 (en) | 1998-04-22 | 1999-04-22 | Method and system for providing cellular communications services |
Country Status (3)
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---|---|
EP (1) | EP1074156A4 (en) |
AU (1) | AU3343799A (en) |
WO (1) | WO1999055102A1 (en) |
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Publication number | Publication date |
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EP1074156A1 (en) | 2001-02-07 |
AU3343799A (en) | 1999-11-08 |
EP1074156A4 (en) | 2004-08-25 |
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