US20010044309A1 - Internet distributed real-time wireless location database - Google Patents
Internet distributed real-time wireless location database Download PDFInfo
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- US20010044309A1 US20010044309A1 US08/948,713 US94871397A US2001044309A1 US 20010044309 A1 US20010044309 A1 US 20010044309A1 US 94871397 A US94871397 A US 94871397A US 2001044309 A1 US2001044309 A1 US 2001044309A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
- G01S1/026—Means for monitoring or calibrating of associated receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/021—Calibration, monitoring or correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/0218—Multipath in signal reception
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0252—Radio frequency fingerprinting
- G01S5/02521—Radio frequency fingerprinting using a radio-map
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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
- H04L67/01—Protocols
- H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
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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
- H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
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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
- 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
- H04L67/535—Tracking the activity of the user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/024—Guidance services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Automation & Control Theory (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
- This application is a continuation-in-part of U.S. patent application Ser. No. 08/780,565, filed Jan. 7, 1997, which is incorporated herein by reference.
- This invention relates generally to cellular telephone network services and management. More specifically, it relates to systems and methods for distributing real-time cellular telephone information in the course of providing location-based services.
- There are many potential uses of real-time cellular telephone location information. For example, U.S. Pat. No. 5,512,908 to Herrick mentions the application of cellular location information to 911 dispatching, tracking unauthorized cell phone usage, and tracking or locating commercial and/or government vehicles. U.S. Pat. No. 5,327,144 to Stilp et al. also mentions various applications of mobile location information, such as locating lost or stolen vehicles, assisting lost motorists, and dispatching emergency vehicles. These services have not been realized, however, due to several difficulties. First, the conventional methods of location finding, which are based on techniques such as direction finding (DF), time of arrival (TOA), and time difference of arrival (TDOA), cannot accurately and reliably locate transmitters in severe multipath environments. Without reliable location information, it is not possible to provide location based services. A solution to this fundamental problem, however, is disclosed by Hilsenrath et al. in U.S. patent application Ser. No. 08/780,565, which is incorporated herein by reference. Their approach, which takes advantage of multipath signals rather than attempting to mitigate or avoid them, measures a signal signature and determines a location by matching the signature with a calibrated database of signature-location pairs.
- Another difficulty facing the realization of location-based services is the expense of communicating the location data to various third party services. In conventional systems, dedicated communication lines are established between the location finding equipment and the third party subscribers in order to transfer the constantly changing location data. Continuously maintaining these lines, especially over long distances, can be very expensive. In addition, if there are many location-based services or many different subscribers, many expensive dedicated lines and/or many differing protocols for communication may need to be devised and deployed to provide the information to each specific location-based service and/or subscriber. The creation and maintenance of these dedicated lines and protocols can be very expensive and inconvenient.
- Accordingly, it is a primary object of the present invention to provide a method for conveniently and inexpensively communicating location information in real time to third party service providers. It is another object of the invention to provide such a method that is simple to use and allows subscribers to be added and deleted easily and inexpensively. It is another object of the invention to provide for the realization of many cellular network services and management applications that have heretofore been unattainable due to the absence of a simple and inexpensive technique for communicating real-time cellular telephone information to service providers. These and other advantages will become apparent from the following description and accompanying drawings
- The present invention provides a system for easily and inexpensively distributing real time location information of cellular telephone users to various third party information subscribers. A dynamic database of current cellular users is created and is maintained at a central server machine. The database has a list of caller entries, where each entry typically comprises a user ID number, such as a phone number, mobile ID number, and/or handset serial ID. The entry also includes, for each user ID number, a user location identifier such as a latitude and longitude, a sector number, a caller or called phone number and/or a street address. Each entry can include additional information as well, such as a current base station for the user and a most recent registration time of the user.
- The database is maintained on an HTTP server connected to the internet. Registered third party information subscribers are given access to the database by means of standard HTTP protocols that ensure authentication and provide encryption for security. Using caller ID or other means for obtaining a caller's phone number, the third party subscriber can obtain, via a simple internet query, the current location of the caller by submitting the phone number to the HTTP server using an HTML form. Standard software on the central server machine verifies the authenticity of the subscriber, looks up the location information in the database, and returns the information to the subscriber. The subscriber can then use the location information to provide any of a wide range of services to the caller, or to dispatch emergency vehicles to the location of the caller. In addition, the server can directly provide many location-based services to callers.
- FIG. 1 is a schematic diagram of a system according to the present invention.
- FIG. 2 is a schematic diagram of a location finding subsystem according to the present invention.
- Although the following detailed description contains many specifics for the purposes of illustration, anyone of ordinary skill in the art will appreciate that many variations and alterations to the following details are within the scope of the invention. Accordingly, the following preferred embodiment of the invention is set forth without any loss of generality to, and without imposing limitations upon, the claimed invention.
- A system for carrying out the invention is shown in FIG. 1.
Hubs 10 determine transmitter locations from transmitter signal information communicated frombase stations 12 tohubs 10 viasignature communication lines 14. As pictured, eachhub 10 handles severalsatellite base stations 12 which collectively cover a contiguous geographical region, such as a metropolitan region. Location information determined athubs 10 is then transmitted tocentral database server 16 vialocation communication lines 18.Central server 16 then combines location information from thedifferent hubs 10 into asingle location database 20.Database 20 is continuously updated byserver 16 to contain the most recent location information. Accordingly,database 20 is a dynamic, real-time database containing the present locations of all transmitters within the geographical regions covered byhubs 10 and their respectivesatellite base stations 12. -
Central server 16 is enabled by conventional hardware and software to act as an HTTP server, and is connected to aninternet 22 by standard network hardware and IP protocols. Also connected tointernet 22 are variousthird party subscribers 24 who desire or require location information fromdatabase 20 for various uses. For example, cellular caller location information can be used to provide dispatchers with immediate locations for 911 callers under emergency circumstances. Location information also can be used for enhanced 411 service, i.e. for real time caller location associated services, such as providing directions to lost motorists. The location information can be used to provide enhanced 911 response of emergency vehicles by tracking the locations of emergency vehicles, coordinating location information with street map databases, and communicating specific optimal directions to appropriate vehicles. Location information can be used by the cellular phone company for location-based billing of cellular calls and to help combat cellular fraud - Location information sent from individual
base station sites 12 tometro hubs 10 can be used to assist in hand-off between cells, for automatic trunking, for channel borrowing, for channel capacity optimization, to more efficiently allocate cellular frequencies, and to increase the capacity of the metro network. It is a significant feature of the present invention that high bandwidth communication lines are not required to determine and communicate location information within such a network. Accordingly, the present invention enables for the first time the ability to use location information to actively monitor and/or manage all the wireless traffic in a network. - FIG. 2 shows a subsystem of the system shown in FIG. 1. A
cellular phone 26 transmitssignals 28 which are received by one or more location findingbase stations 12.Base stations 12 may determine the location ofphone 26 by one of, or a combination of, several location finding techniques. In the case where there is not severe multipath, or where accurate location information is not required, any of the conventional methods of location finding may be used. These conventional methods are based on techniques such as direction finding (DF), time of arrival (TOA), and time difference of arrival (TDOA). Typically, signal information is sent from thebase stations 12 to thehub 10 for location determination through comparative analysis of the signal information. In the preferred embodiment, the location finding technique disclosed by Hilsenrath et al. in U.S. patent application Ser. No. 08/780,56.5 is used. This technique has the advantage of providing accurate location information even in severe multipath environments. It also has the virtue of being able to determine an accurate location based on signals from just onebase station 12. Nevertheless, through the combination of signal information fromseveral base stations 12, an even more accurate location may be determined byhub 10. - In the preferred embodiment, the
base stations 12 determine signal signatures and transmit these signatures at periodic intervals tohub 10. Also transmitted are identifiers associated with each signature, such as a handset phone number or a handset ID number. The signatures and identifiers can be transmitted frombase stations 12 tohub 10 by various conventional techniques such as a dedicated phone line, a radio frequency channel, or a computer network connection. In the preferred embodiment, the communication links 14 comprise computer network connections. For example,base stations 12 andhub 10 may each have an inexpensive dial-up connection to an internet service provider, and the signature and identifier data is communicated to the hub through this network connection. - At
hub 10 the signatures from thebase stations 12 are used to determine transmitter locations by matching the signal signatures with calibrated signatures and corresponding locations stored in a database. Specific techniques for performing this matching, as well as techniques for combining information from several base stations to improve accuracy and reduce ambiguity, are disclosed by Hilsenrath et al. in U.S. patent application Ser. No. 08/780,565. In an alternate embodiment, eachbase station 12 performs its own matching to independently determine a location or set of likely locations. This location information is then transmitted tohub 10 instead of, or in addition to, signal signature information. - The location and identifier information at the
hubs 10 is sent periodically to thedatabase server 16 overcommunication links 18 similar tolinks 14. Although thehubs 10 andserver 16 are distinct in this embodiment, thevarious hubs 10 are not necessarily distinct from each other or from thedatabase server 16. In other words, all thebase stations 12 may be directly connected todatabase server 16, without the use ofhubs 10.Database server 16, in this case, performs all the tasks of thehubs 10, as described above. - Irrespective of these system architecture options, however,
database server 16 maintains in a memory or other data storage device 20 a dynamic database containing real-time location and identifier data as determined from signals received bybase stations 12. More specifically, the database has a list of entries, where each entry typically comprises a user identifier, such as a handset phone number, mobile ID number, and/or handset serial ID. The entry also includes, for each user identifier, a current user location identifier such as a latitude and longitude or other coordinates, a sector number, and/or a street address. Each entry can include additional information as well, such as a current base station for the user, a most recent registration time of the user, and a most recent update time for the user location. -
Central server 16 is configured as an HTTP server with a dedicated connection to theinternet 22. Registered thirdparty information subscribers 24 are given access to the database by means of standard HTTP protocols that ensure subscriber authentication and provide encryption for security. Specifically, the database may be accessed by sending toserver 16 an HTTP request to access a URL which makes reference to a cgi-bin executable script. The URL also contains information identifying the user, such as a name or telephone number, whose location is requested. A cgi-bin script located onserver 16 determines a user identifier from the user information in the URL, obtains the corresponding real-time location of the user from thedatabase 20, and returns this location information to thesubscriber 24 as an HTML document. Techniques for responding to queries via HTTP search requests, as described above, are well known in the art.Server 16 may perform additional functions to enhance security, such as permit HTTP access only from certain preregistered subscribers, and encrypt information transmitted to and from the subscribers. Theserver 16 may also selectively limit a subscriber's access to information about particular users. Techniques for configuring HTTP servers to perform functions of this nature are well known in the art. - In a typical application of the present invention, a
database subscriber 24 uses caller ID or another technique to automatically identify a caller. The third party subscriber can then automatically generate a simple search query containing the caller's identifying information, and submit the query to the HTTP server using an HTML form, as described above. The cgi-bin software on the central server machine then verifies the authenticity of the subscriber, looks up in the database the real time location information corresponding to the caller information, and returns the location information to the subscriber. The subscriber can then use the location information to provide any of a wide range of services to the caller, as previously described above. - Certain privileged subscribers may be permitted to download the entire database of user identifiers and locations. For example, a cellular telephone service provider may use location information to perform a statistical analysis of service use as a function of location. Such analysis may help provide improved service to cellular telephone customers. In this situation it may be especially useful to include additional information in the database, such as the last registration time of the user, the base station of the user, and the channel of the user. Such information can be especially useful to such a privileged subscriber. As noted previously, the server can be configured to make such information selectively available only to specific subscribers.
- In addition to third-party subscribers, the central server may also be accessed by the users themselves. For example, an organization may find it desirable to have real-time access to the locations of various organization members who are provided with cellular phones and regularly engaged in movement. The organization can access the
central server 16 in order to obtain location information of its members. A member can call in to the organizational office, for example, to check in after a task has been completed. The office can then verify the member's location. Note that the automatic registration protocol in certain cellular standards allows the determination of a phone location even when the phone is not in use. In this case, location information can be provided even for users who are not actively using their phones. The server, therefore, may provide additional services such as generating a map indicating the real time locations of all the members of an organization. - In another application of the present invention, an individual using a portable laptop computer equipped with a wireless modem can connect to an internet service provider and directly access the database of
server 16. In this way, the individual's location can be reported directly to the individual. The server may provide various additional location based services to such an individual. For example, the server can provide the user with automatically generated HTML documents containing lists of nearby ATM machines, nearby restaurants, nearby gas stations, or other places of interest. The server can also provide the individual with a detailed road map of the nearby area, indicating on the map the individual's present location. If the user is not equipped with a laptop computer and wireless modem, similar services may be provided through the use of voice recognition and speech synthesis techniques. For example, the user may dial in to a telephone line connected to the server, and the server can provide voice options to the user, e.g. “for the location of gas stations near you,press 1; for the location of ATM machines near you, press 2.” These options may be user-configurable. Using conventional speech recognition techniques, the user can respond to these options by simply saying “one” rather than using the touch-tone keypad of the telephone handset. These features may also be performed by a third-party subscriber rather than by the central server itself. In this case, the third party subscriber performs all the voice recognition and speech synthesis interfaces, customization features, etc., while the central server provides the location information to the subscriber via the internet, as discussed above. - In another application of the invention, information or advertisements can be provided to the user based on a present location and/or the user's personal profile. For example, a user who is known to be interested in the theatre can be alerted to the production of a play by a small theatre company in the vicinity of the user, or a user who is known to be interested in consumer electronics can be alerted to a sale taking place that day at a nearby retailer. The user can be alerted to this information upon placing a call in a specific region. The central server, which can maintain a database of such events and their localities, can match a user's interest profile and location with appropriate events and alert the user when a call is placed. In addition, or as an alternative, the server can “push” the information to the user by actively placing an automated phone call to the user upon entering the local area of a matching event. For example, if a user is interested in local traffic or weather conditions, the server can be configured to automatically place a call to the user upon entering a local area where a traffic or weather advisory is in effect. As noted above, through the use of the periodic registration protocols of certain cellular standards, the server can determine the location of a user even when no call is being made.
- In a further application of the present invention, the server can be configured by the user to automatically take specific actions based on the location of the user. For example, the user may program the system to send a voice mail, an e-mail, or place an automated phone call to a predetermined number when the user arrives or leaves from a certain location. Specifically, a user might program the server to make a call to a home phone number to alert family members of the user's arrival. Or the server might be programmed to alert a central office when a delivery person has arrived at a delivery location. Clearly, there are many other similar applications of the present invention.
- Third party subscribers may use various techniques to identify callers. The widespread caller-ID feature of most telephone systems can be integrated into a subscriber's system to automatically identify a caller. Another technique for automatic identification of callers is to compare the voice signal of the caller with voice signals captured at the
bases 12. By matching the caller's voice with one of the captured voice signals, the caller can be identified automatically. Alternatively, a caller can manually identify himself or herself by typing in a code number on the telephone keypad. - It will be apparent from the foregoing examples that many variations and alterations to the details are possible without departing from the general spirit and scope of the invention.
Claims (12)
Priority Applications (1)
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US08/948,713 US6456852B2 (en) | 1997-01-08 | 1997-10-10 | Internet distributed real-time wireless location database |
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US08/780,565 US6026304A (en) | 1997-01-08 | 1997-01-08 | Radio transmitter location finding for wireless communication network services and management |
US08/948,713 US6456852B2 (en) | 1997-01-08 | 1997-10-10 | Internet distributed real-time wireless location database |
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US08/780,565 Continuation-In-Part US6026304A (en) | 1997-01-08 | 1997-01-08 | Radio transmitter location finding for wireless communication network services and management |
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Cited By (79)
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US20020038386A1 (en) * | 2000-09-22 | 2002-03-28 | Ranjit Bhatia | Business to business engine and system for facilitating information interexchange using realtime data |
US6377793B1 (en) * | 2000-12-06 | 2002-04-23 | Xybernaut Corporation | System and method of accessing and recording messages at coordinate way points |
US20020155844A1 (en) * | 2001-04-20 | 2002-10-24 | Koninklijke Philips Electronics N.V. | Distributed location based service system |
US20020161587A1 (en) * | 2001-04-27 | 2002-10-31 | Pitts Ashton F. | Natural language processing for a location-based services system |
US20020160772A1 (en) * | 2001-04-27 | 2002-10-31 | Gailey Michael L. | Routing call failures in a location-based services system |
US6487407B2 (en) * | 2001-03-30 | 2002-11-26 | Motorola, Inc. | Register for and method of providing contact information for a communications unit identified by a uniform resource name |
WO2003019968A1 (en) * | 2001-08-29 | 2003-03-06 | Nokia Corporation | Monitoring a subscriber |
WO2003036919A2 (en) * | 2000-10-23 | 2003-05-01 | Signalsoft Corp. | Identifying a wireless user based on re-routing |
US20030142804A1 (en) * | 2001-01-31 | 2003-07-31 | Kazuhiro Yamada | Method and device for limitng call accompanying execution of application |
US20040003125A1 (en) * | 2002-04-11 | 2004-01-01 | Nec Corporation | Method of operating a gateway with a location information system |
US6681107B2 (en) | 2000-12-06 | 2004-01-20 | Xybernaut Corporation | System and method of accessing and recording messages at coordinate way points |
WO2004047477A1 (en) * | 2002-11-20 | 2004-06-03 | Koninklijke Philips Electronics N.V. | A method of distributing the location data of a mobile device |
US20040153664A1 (en) * | 2003-01-31 | 2004-08-05 | Alcatel | Method, a locator agent unit, a distributed locator system and a computer software product for coordinating location dependent information, services, and tasks |
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