Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-09-15
2001-11-20
Maung, Nay (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C342S357490
Reexamination Certificate
active
06321092
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates in general to wireless location-based applications and, in particular, to a method and apparatus for use in processing multiple location finding equipment inputs and making the resulting location information available to wireless location-based applications.
BACKGROUND OF THE INVENTION
Wireless communications networks generally allow for voice and/or data communication between wireless stations, e.g., wireless telephones (analog, digital cellular and PCS), pagers or data terminals that communicate using RF signals. In recent years, a number of location-based service systems have been implemented or proposed for wireless networks. Such systems generally involve determining location information for a wireless station and processing the location information to provide an output desired for a particular application.
Examples of such existing or proposed applications include emergency or “911” applications, location dependent call billing, cell-to-cell handoff and vehicle tracking. In 911 applications, the location of a wireless station is determined when the station is used to place an emergency call. The location is then transmitted to a local emergency dispatcher to assist in responding to the call. In typical location dependent call billing applications, the location of a wireless station is determined, for example, upon placing or receiving a call. This location is then transmitted to a billing system that determines an appropriate billing value based on the location of the wireless station. In handoff applications, wireless location is determined in order to coordinate handoff of call handling between network cells. Vehicle tracking applications are used, for example, to track the location of stolen vehicles. In this regard, the location of a car phone or the like in a stolen vehicle can be transmitted to the appropriate authorities to assist in recovering the vehicle.
From the foregoing, it will be appreciated that location-based service systems involve location finding equipment (LFE) and location-related applications. To some extent, the LFEs and applications have developed independently. In this regard, a number of types of LFEs exist and/or are in development. These include so-called angle of arrival (AOA) time difference of arrival (TDOA), handset global positioning system (GPS) and the use of cell/sector location. The types of equipment employed and the nature of the information received from such equipment vary in a number of ways. First, some of these equipment types, like GPS, are wireless station-based whereas others are “ground-based”, usually infrastructure-based. Some can determine a wireless station's location at any time via a polling process, some require that the station be transmitting on the reverse traffic channel (voice channel), and others can only determine location at call origination, termination, and perhaps registration. Moreover, the accuracy with which location can be determined varies significantly from case to case. Accordingly, the outputs from the various LFE's vary in a number of ways including data format, accuracy and timeliness.
The nature of the information desired for particular applications also varies. For example, for certain applications such as 911, accuracy and timeliness are important. For the applications such as vehicle tracking, continuous or frequent monitoring independent of call placement is a significant consideration. For other applications, such as call billing, location determination at call initiation and call termination or during handoff is generally sufficient.
Heretofore, developers have generally attempted to match available LFEs to particular applications in order to obtain the location information required by the application. This has not always resulted in the best use of available LFE resources for particular applications. Moreover, applications designed to work with a particular LFE can be disabled when information from that LFE is unavailable, e.g., due to limited coverage areas, malfunctions or local conditions interfering with a particular LFE modality. In addition, the conventional query and response mode of operation between applications and the associated LFEs has resulted in the use by applications of LFE dependent data formats, LFE limited data contents, and single LFE input location determinations.
SUMMARY OF THE INVENTION
The present invention is directed to a method and apparatus for using multiple LFE inputs to enhance the location information made available to wireless location-based applications. The invention allows wireless location-based applications access to information based inputs from LFEs of different types, thereby enhancing the timeliness, accuracy and/or reliability of the requested location information. Moreover, in accordance with the present invention, applications are independent of particular LFEs and can access location information from various LFE sources without requiring specific adaptations, data formats, or indeed knowledge of the LFE sources employed, in order to access and use such location information. By virtue of such independence, new location finding technologies can be readily deployed and existing applications can exploit such new technologies without compatibility issues. The invention also allows multiple LFE inputs, from one or more LFEs, to be used to allow for wireless station tracking and reduced location uncertainty.
According to one aspect of the present invention, a method is provided for using multiple (i.e., two or more) LFEs to support a wireless location application. The method involves receiving first and second inputs from first and second LFEs, storing location information based on the inputs in memory, receiving a location request regarding a wireless station from a wireless location application, selectively retrieving the location information from memory, and outputting a response to the location request to wireless location application.
The first and second LFEs preferably may employ different location finding technologies, e.g, GPS, AOA, TDOA, and cell/sector technologies. The stored location information preferably includes at least location information and corresponding time information for particular wireless stations, and may further include location uncertainty information, travel speed information and travel direction information. In response to the location request from the wireless location application, location information may be retrieved from memory or, alternatively, one or more of the LFEs may be prompted to obtain location information. In this regard, the location request may include a specification regarding the desired location information, for example, indicating how recent or how accurate the information should be. If the memory includes information conforming to the specification, then such information is retrieved and output to the requesting application. Otherwise, appropriate information may be obtained by prompting one or more LFEs to locate the wireless station of interest.
In accordance with another aspect of the present invention, a processing system is interposed between the LFEs and the wireless location applications such that the applications can access location information in a manner that is independent of the location finding technology employed by the LFEs. The corresponding process implemented by the processing system involves: receiving LFE dependent location data (i.e., location data having a content and/or format dependent on the location finding technology employed) from multiple LFEs receiving a location request from a wireless location application seeking LFE independent location data (i.e., location data having a content and format independent of any particular location finding technology) and responding to the location request based on LFE dependent location data. The process implemented by the processing system may further involve generating and storing LFE independent location data based on the LFE dependent data. The processing system may
Fitch James
Hose David L.
McKnight Michael
Marsh & Fischmann & Breyfogle LLP
Maung Nay
Signal Soft Corporation
Vuong Quochien B.
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