WO2001027649A1 - Method and apparatus for transferring location estimates from a first transceiver to a second transceiver - Google Patents

Method and apparatus for transferring location estimates from a first transceiver to a second transceiver Download PDF

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Publication number
WO2001027649A1
WO2001027649A1 PCT/US2000/026350 US0026350W WO0127649A1 WO 2001027649 A1 WO2001027649 A1 WO 2001027649A1 US 0026350 W US0026350 W US 0026350W WO 0127649 A1 WO0127649 A1 WO 0127649A1
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WO
WIPO (PCT)
Prior art keywords
transceiver
location estimate
location
confidence level
estimate
Prior art date
Application number
PCT/US2000/026350
Other languages
French (fr)
Inventor
John Douglas Reed
Jack Anthony Smith
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Priority to BRPI0014275-1A priority Critical patent/BR0014275B1/en
Priority to CA002386681A priority patent/CA2386681C/en
Priority to JP2001530607A priority patent/JP2003511991A/en
Publication of WO2001027649A1 publication Critical patent/WO2001027649A1/en
Priority to FI20020648A priority patent/FI114577B/en
Priority to SE0201040A priority patent/SE0201040D0/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009Transmission of position information to remote stations
    • G01S5/0072Transmission between mobile stations, e.g. anti-collision systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/0205Details
    • G01S5/0244Accuracy or reliability of position solution or of measurements contributing thereto
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]

Definitions

  • This invention relates in general to wireless communication systems, and more particularly, to a method and apparatus for transferring location estimates from a first transceiver of a plurality of wireless transceivers to a second transceiver.
  • Wireless communication systems for serving the connectivity needs of portable transceivers are rapidly evolving into linked, multi-speed wireless networks.
  • a wireless wide area network may provide relatively low speed connectivity throughout a metropolitan area
  • numerous wireless short range networks also may exist throughout the area for providing short range high speed connectivity where needed.
  • Portable transceivers that are capable of peer-to-peer communications e.g., Bluetooth devices, also can create ad hoc SRNs with one another that can operate independently of fixed portions of the wireless communications system.
  • a portable transceiver can develop a need for information that is available from a network server, or from another transceiver within the same network as the first transceiver.
  • the information may be of many different types, and a good example is server assisted global positioning system (GPS) information, which can greatly enhance the sensitivity and accuracy of a GPS receiver that may be used by the portable transceiver for location determination.
  • GPS global positioning system
  • the network server has been centrally located, e.g., at the site of a central controller of the wireless communications system, and has been accessed through the wireless WAN. Accessing the network server for assisted location information can generate substantial traffic in the wireless WAN when a large number of the portable transceivers are GPS equipped. This traffic is undesirable, as it can increase system latency and potentially can overload the wireless WAN.
  • a method and apparatus for transferring location estimates from a first transceiver of a plurality of transceivers to a second transceiver Preferably, the method and apparatus will operate to substantially reduce the wireless WAN traffic required to seek and transfer the information.
  • FIG. 1 is an electrical block diagram of an exemplary wireless communication system in accordance with the present invention
  • FIG. 2 is an electrical block diagram of an exemplary peer-to-peer mode of operation of the transceivers in accordance with the present invention
  • FIG. 3 is an electrical block diagram of an exemplary transceiver in accordance with the present invention
  • FIG. 4 is a flow diagram depicting the operation of the transceiver in accordance with the present invention.
  • FIG. 5 is a flow diagram depicting the process of transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver according to the method and system of the present invention.
  • an electrical block diagram depicts an exemplary wireless communication system in accordance with the present invention, comprising a fixed portion 102 including a controller 112 and a plurality of conventional base stations 116, the communication system also including a plurality of transceivers 122.
  • the base stations 116 preferably communicate with the transceivers 122 utilizing conventional radio frequency (RF) techniques, and are coupled by conventional communication links 114 to the controller 112, which controls the base stations 116.
  • RF radio frequency
  • Each of the base stations 116 transmits RF signals to the transceivers 122 via an antenna 118.
  • the base stations 116 preferably each receive RF signals from the plurality of transceivers 122 via the antenna 118.
  • another wireless communication technology such as infra red technology, can be used to comminute between the base stations 116 and the transceiver 122.
  • the controller 112 is preferably coupled by telephone links 101 to a public switched telephone network (PSTN) 110 for receiving selected call message originations therefrom.
  • PSTN public switched telephone network
  • Selective call originations comprising voice or data messages from the PSTN can be generated, for example, from a conventional telephone 111 or a conventional computer 117 coupled to PSTN 110.
  • LAN local area network
  • WAN wide area network
  • the controller 112 is also coupled to a conventional network server 108 for providing information requested by the transceivers 122.
  • the network server 108 is preferably coupled to a GPS receiver
  • FIG. 2 illustrates an electrical block diagram of an exemplary peer-to-peer mode of operation of the transceivers 122 in accordance with the present invention.
  • the transceivers 122 form an ad hoc short-range network among themselves.
  • FIG. 3 is an electrical block diagram of an exemplary transceiver 122 in accordance with the present invention.
  • the transceiver 122 comprises an antenna 304 for receiving an incoming call or message and for transmitting an outgoing call or message.
  • the antenna 304 is preferably coupled to a conventional receiver 308 for receiving the incoming call or message and is coupled to a conventional transmitter 309 for transmitting the outgoing call or message.
  • the receiver 308 and transmitter 309 are coupled to a processing system 306 for processing the incoming and outgoing call or messages and for controlling the transceiver 122 in accordance with the present invention.
  • a user interface 314 may also be coupled to the processing system 306 for interfacing with a user.
  • the user interface 314 may comprise a conventional telephone keypad 320 or a conventional keyboard for requesting that an operation be performed and for controlling the transceiving 122, a conventional display 316, and a conventional alert element 318 for alerting the user when an incoming call or message arrives.
  • a conventional clock 307 is also coupled to the processing system 306 for supporting time keeping requirements of the transceiver 122.
  • the processing system 306 comprises a conventional processor 310 and a conventional memory 312.
  • the memory 312 comprises software elements and data for programming the processing system 306 in accordance with the present invention.
  • the memory 312 further comprises a message processing element 314 for programming the processing system 306 to process messages through well-known techniques.
  • the memory 312 includes a location information processing program 316 for programming the processing system 306 to cooperate with the controller 312 to process location information through well known techniques, such as server assisted GPS techniques.
  • the transceiver 122 also includes a location receiver 334, such as a GPS receiver, coupled to the processing system 306.
  • FIG. 4 is a flow diagram depicting the operation of a transceiver in accordance with the present invention.
  • the flow begins at reference numeral 402 wherein the step of detecting a need for a location estimate is performed.
  • the step of receiving a first transceiver's location estimate and predetermined attributes of the first transceiver's location estimate is performed.
  • the step of receiving a calculated confidence level of the first transceiver's location estimate based upon the predetermined attributes is performed.
  • the step of determining whether to update a second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver is performed.
  • FIG. 5 is a flow diagram depicting the process of transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver according to the method and system of the present invention.
  • the flow begins at reference numeral 502, wherein the step of detecting a need for a location estimate is performed.
  • the step of transmitting, from a first transceiver, a location estimate of the first transceiver and predetermined attributes of the first transceiver's location estimate is performed.
  • the step of calculating a confidence level of the location estimate of the first transceiver based upon the predetermined attributes is performed.
  • the first transceiver's location estimate and the calculated confidence level is performed at a second transceiver.
  • the step of determining whether to update the second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver is performed.
  • the present invention comprises a method and apparatus to obtain location estimates for a device by interacting with nearby devices.
  • the nearby devices may use any number of means to make the location estimate.
  • Confidence estimates are then assigned to the information obtained from the interactions with the nearby devices.
  • a number of parameters may be used to establish a confidence level of the location estimate received from a nearby device, such that a confidence level may be determined from the following equation:
  • CL the calculated confidence level of the new location estimate obtained from interaction with a nearby device
  • b a scaling factor.
  • the confidence estimates assigned to the information obtained from the interactions with the nearby devices may be a function of the confidence level of the donated location estimate, time since the estimate was made, motion of the receiving unit, the method used to obtain the location estimate, the number of times the information may have been repeated from one device to another, the signal strength and quality of the communication signal, etc.
  • fixed devices such as desktop computers, printers, etc. may store an average location estimates with the highest confidence estimates to improve the base line location estimate for these devices.
  • transceivers can be positioned at fixed locations.
  • a transceiver serving as a wireless interface for a printer, facsimile machine, computer, etc.
  • Such a fixed transceiver preferably is pre-programmed with location information describing the location at which the transceiver is placed.
  • a transceiver in response to having location information that is likely to be of interest to other transceivers, can advertise the availability of the location information, e.g., through periodic transmissions of messages.

Abstract

A method and apparatus for transferring location estimates from a first transceiver (122) of a plurality of wireless transceivers (122) to a second transceiver (132) is disclosed. The present invention makes use of a low power short-range auxiliary communication link incorporated within networked devices to interact with nearby devices for obtaining location estimates of the current location of a device. Confidence estimates (504) are then assigned to the information obtained from the interactions with the nearby devices, and a determination (508) of whether to update the location estimate is made.

Description

METHOD AND APPARATUS FOR TRANSFERRING LOCATION ESTIMATES FROM A FIRST TRANSCEIVER TO A SECOND TRANSCEIVER
Field of the Invention
This invention relates in general to wireless communication systems, and more particularly, to a method and apparatus for transferring location estimates from a first transceiver of a plurality of wireless transceivers to a second transceiver.
Background of the Invention
Wireless communication systems for serving the connectivity needs of portable transceivers are rapidly evolving into linked, multi-speed wireless networks. For example, a wireless wide area network (WAN) may provide relatively low speed connectivity throughout a metropolitan area, while numerous wireless short range networks (SRNs) also may exist throughout the area for providing short range high speed connectivity where needed. Portable transceivers that are capable of peer-to-peer communications, e.g., Bluetooth devices, also can create ad hoc SRNs with one another that can operate independently of fixed portions of the wireless communications system.
Sometimes, a portable transceiver can develop a need for information that is available from a network server, or from another transceiver within the same network as the first transceiver. The information may be of many different types, and a good example is server assisted global positioning system (GPS) information, which can greatly enhance the sensitivity and accuracy of a GPS receiver that may be used by the portable transceiver for location determination. Typically, the network server has been centrally located, e.g., at the site of a central controller of the wireless communications system, and has been accessed through the wireless WAN. Accessing the network server for assisted location information can generate substantial traffic in the wireless WAN when a large number of the portable transceivers are GPS equipped. This traffic is undesirable, as it can increase system latency and potentially can overload the wireless WAN.
In addition, many transceivers will not have location finding capability, yet could benefit from location information either locally, or within a network. Thus, what is needed is a method and apparatus for transferring location estimates from a first transceiver of a plurality of transceivers to a second transceiver. Preferably, the method and apparatus will operate to substantially reduce the wireless WAN traffic required to seek and transfer the information.
Brief Description of the Drawings
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objects, and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
FIG. 1 is an electrical block diagram of an exemplary wireless communication system in accordance with the present invention;
FIG. 2 is an electrical block diagram of an exemplary peer-to-peer mode of operation of the transceivers in accordance with the present invention;
FIG. 3 is an electrical block diagram of an exemplary transceiver in accordance with the present invention; FIG. 4 is a flow diagram depicting the operation of the transceiver in accordance with the present invention; and
FIG. 5 is a flow diagram depicting the process of transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver according to the method and system of the present invention.
Detailed Description of the Invention
Referring to FIG. 1, an electrical block diagram depicts an exemplary wireless communication system in accordance with the present invention, comprising a fixed portion 102 including a controller 112 and a plurality of conventional base stations 116, the communication system also including a plurality of transceivers 122. The base stations 116 preferably communicate with the transceivers 122 utilizing conventional radio frequency (RF) techniques, and are coupled by conventional communication links 114 to the controller 112, which controls the base stations 116. Each of the base stations 116 transmits RF signals to the transceivers 122 via an antenna 118. The base stations 116 preferably each receive RF signals from the plurality of transceivers 122 via the antenna 118. It will be appreciated by those skilled in the art that, alternatively, another wireless communication technology, such as infra red technology, can be used to comminute between the base stations 116 and the transceiver 122.
The controller 112 is preferably coupled by telephone links 101 to a public switched telephone network (PSTN) 110 for receiving selected call message originations therefrom. Selective call originations comprising voice or data messages from the PSTN can be generated, for example, from a conventional telephone 111 or a conventional computer 117 coupled to PSTN 110. It will be appreciated that, alternatively, other types of networks, e.g., a local area network (LAN), a wide area network (WAN), and the internet, to name a few, can be used for receiving selective call originations. The controller 112 is also coupled to a conventional network server 108 for providing information requested by the transceivers 122. The network server 108 is preferably coupled to a GPS receiver
106 for cooperating with the network server 108 to provide server assisted GPS information to the transceivers 122.
It will be appreciated by those skilled in the art that for peer-to-peer and short-range communications, many technologies and protocols, such as Bluetooth, Piano, IRDA, Home RF, and 802.11, may be utilized. It will further be appreciated by those skilled in the art that the present invention is applicable to many different types of wireless communications systems, including cellular telephone systems, trunked dispatch systems, and voice and data messaging systems, to name a few.
FIG. 2 illustrates an electrical block diagram of an exemplary peer-to-peer mode of operation of the transceivers 122 in accordance with the present invention. In this mode, the transceivers 122 form an ad hoc short-range network among themselves.
FIG. 3 is an electrical block diagram of an exemplary transceiver 122 in accordance with the present invention. The transceiver 122 comprises an antenna 304 for receiving an incoming call or message and for transmitting an outgoing call or message. The antenna 304 is preferably coupled to a conventional receiver 308 for receiving the incoming call or message and is coupled to a conventional transmitter 309 for transmitting the outgoing call or message. The receiver 308 and transmitter 309 are coupled to a processing system 306 for processing the incoming and outgoing call or messages and for controlling the transceiver 122 in accordance with the present invention. A user interface 314 may also be coupled to the processing system 306 for interfacing with a user. The user interface 314 may comprise a conventional telephone keypad 320 or a conventional keyboard for requesting that an operation be performed and for controlling the transceiving 122, a conventional display 316, and a conventional alert element 318 for alerting the user when an incoming call or message arrives. A conventional clock 307 is also coupled to the processing system 306 for supporting time keeping requirements of the transceiver 122.
The processing system 306 comprises a conventional processor 310 and a conventional memory 312. The memory 312 comprises software elements and data for programming the processing system 306 in accordance with the present invention. In the preferred embodiment, the memory 312 further comprises a message processing element 314 for programming the processing system 306 to process messages through well-known techniques. In addition, the memory 312 includes a location information processing program 316 for programming the processing system 306 to cooperate with the controller 312 to process location information through well known techniques, such as server assisted GPS techniques. In that embodiment, the transceiver 122 also includes a location receiver 334, such as a GPS receiver, coupled to the processing system 306. FIG. 4 is a flow diagram depicting the operation of a transceiver in accordance with the present invention. The flow begins at reference numeral 402 wherein the step of detecting a need for a location estimate is performed. Next, at reference numeral 404, the step of receiving a first transceiver's location estimate and predetermined attributes of the first transceiver's location estimate is performed. Thereafter, at reference numeral 406, the step of receiving a calculated confidence level of the first transceiver's location estimate based upon the predetermined attributes is performed. Finally, at reference numeral 408, the step of determining whether to update a second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver is performed.
FIG. 5 is a flow diagram depicting the process of transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver according to the method and system of the present invention. The flow begins at reference numeral 502, wherein the step of detecting a need for a location estimate is performed. Next, at reference numeral 504, the step of transmitting, from a first transceiver, a location estimate of the first transceiver and predetermined attributes of the first transceiver's location estimate is performed. Next, at reference numeral 506, the step of calculating a confidence level of the location estimate of the first transceiver based upon the predetermined attributes is performed. Thereafter, at reference numeral 508, the step of receiving
, at a second transceiver, the first transceiver's location estimate and the calculated confidence level is performed. Finally, at reference numeral 510, the step of determining whether to update the second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver is performed.
As described above, the present invention comprises a method and apparatus to obtain location estimates for a device by interacting with nearby devices. The nearby devices may use any number of means to make the location estimate. Confidence estimates are then assigned to the information obtained from the interactions with the nearby devices. A number of parameters may be used to establish a confidence level of the location estimate received from a nearby device, such that a confidence level may be determined from the following equation:
CL = c[CL(d\)YhSE' where:
CL = the calculated confidence level of the new location estimate obtained from interaction with a nearby device
S = the attenuation in confidence level from being a second party to the estimate. Each generation of donor to recipient will see this attenuation in confidence level.
CL(dl) = the confidence level of the donor device using a predefined normalized scale which describes the estimated accuracy, time since a measurement occurred, type of estimate, signal strength, etc. For example, CL(dl) = 1 for a timely GPS reading; CL(dl) = 0.1 for a second generation reading, etc. b = a scaling factor.
SE = the speed estimate of the device receiving the location estimate and calculating a confidence level. For example, SE = 0 for fixed devices, and increases in proportion to speed. t = time in seconds. As such, the confidence estimates assigned to the information obtained from the interactions with the nearby devices may be a function of the confidence level of the donated location estimate, time since the estimate was made, motion of the receiving unit, the method used to obtain the location estimate, the number of times the information may have been repeated from one device to another, the signal strength and quality of the communication signal, etc. In addition, fixed devices, such as desktop computers, printers, etc. may store an average location estimates with the highest confidence estimates to improve the base line location estimate for these devices.
It will be appreciated by those skilled in the art that selected ones of the transceivers can be positioned at fixed locations. As described above, an example is a transceiver serving as a wireless interface for a printer, facsimile machine, computer, etc. Such a fixed transceiver preferably is pre-programmed with location information describing the location at which the transceiver is placed. It will be further appreciated that, in response to having location information that is likely to be of interest to other transceivers, a transceiver can advertise the availability of the location information, e.g., through periodic transmissions of messages.
The foregoing description of a preferred embodiment of the invention has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiment was chosen and described to provide the best illustration of the principles of the invention and its practical application, and to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.

Claims

ClaimsWhat is claimed is:
1. A method for transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver, the method comprising the steps of:
detecting a need for a location estimate;
transmitting, from a first transceiver, a location estimate of the first transceiver and predetermined attributes of the first transceiver's location estimate;
calculating a confidence level of the location estimate of the first transceiver based upon the predetermined attributes;
receiving, at a second transceiver, the first transceiver's location estimate and the calculated confidence level, the second transceiver having its own location estimate and confidence level; and
determining whether to update the second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver.
2. A method as recited in claim 1, including the step of adjusting a confidence level of a location estimate based upon one of
the lapsed time since receiving an updated location estimate;
an estimate of motion of a transceiver; and
the proximity of the first transceiver to the second transceiver.
3. A method as recited in claim 1, including the step of attenuating a confidence level with each generation of exchanging location estimates, thereby reducing the impact of second and third hand information.
4. A method as recited in claim 1, including the step of storing and averaging the location estimates from those transceivers with the highest confidence levels to improve the base line location estimate for those transceivers.
5. A method as recited in claim 1, including the step of utilizing a third transceiver to communicate the first transceiver's location estimate and confidence level to the second transceiver.
6. A method as recited in claim 1, further comprising the step of preprogramming fixed ones of the plurality of wireless transceivers with location information corresponding to a location at which each is placed.
7. A method for transferring a location estimate from a first transceiver of a plurality of wireless transceivers to a second transceiver, the method comprising the steps of:
detecting a need for a location estimate;
at a second transceiver having its own location estimate and confidence level and in response to the step of detecting:
receiving a first transceiver's location estimate and predetermined attributes of the first transceiver's location estimate;
receiving a calculated confidence level of the first transceiver's location estimate based upon the predetermined attributes; and
determining whether to update the second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver.
8. A method as recited in claim 7, including the step of adjusting a confidence level of a location estimate based upon one of
the lapsed time since receiving an updated location estimate;
an estimate of motion of a transceiver; and
the proximity of the first transceiver to the second transceiver.
9. A method as recited in claim 7, including the step of attenuating a confidence level with each generation of exchanging location estimates, thereby reducing the impact of second and third hand information.
10. A method as recited in claim 7, including the step of storing and averaging the location estimates from those transceivers with the highest confidence levels to improve the base line location estimate for those transceivers.
11. A method as recited in claim 7, including the step of utilizing a third transceiver to communicate the first transceiver's location estimate and confidence level to the second transceiver.
12. A method as recited in claim 7, further comprising the step of preprogramming fixed ones of the plurality of wireless transceivers with location information corresponding to a location at which each is placed.
13. An apparatus for transferring a location estimate from a first transceiver of a plurality of transceivers to a second transceiver, the second transceiver having its own location estimate and confidence level, the apparatus comprising:
a receiver adapted to receive the location estimate;
a transmitter adapted to transmit the location estimate; and
a processing system coupled to the receiver and coupled to the transmitter, the processing system programmed to:
detect a need for a location estimate;
receive the first transceiver's location estimate and predetermined attributes of the first transceiver's location estimate;
calculate a confidence level of the first transceiver's location estimate based upon the predetermined attributes; and
determine whether to update the second transceiver's location estimate and confidence level based upon the received location estimate and calculated confidence level of the first transceiver.
14. An apparatus as recited in claim 13, wherein the processing system is further programmed to adjust a confidence level of a location estimate based upon one of:
the lapsed time since receiving an updated location estimate;
an estimate of motion of a transceiver; and
the proximity of the first transceiver to the second transceiver.
15. An apparatus as recited in 13, wherein the processing system is further programmed to attenuate a confidence level with each generation of exchanging location estimates, thereby reducing the impact of second and third hand information.
16. An apparatus as recited in claim 13, wherein the processing system is further programmed to store and averaging the location estimates from those transceivers with the highest confidence levels to improve the base line location estimate for those transceivers.
17. An apparatus as recited in claim 13, wherein the processing system is further programmed to utilize a third transceiver to communicate the first transceiver's location estimate and confidence level to the second transceiver.
18. An apparatus as recited in claim 13, wherein the processing system is further preprogrammed with location information corresponding to a location at which each one of fixed ones of the plurality of wireless transceivers is placed.
PCT/US2000/026350 1999-10-08 2000-09-26 Method and apparatus for transferring location estimates from a first transceiver to a second transceiver WO2001027649A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BRPI0014275-1A BR0014275B1 (en) 1999-10-08 2000-09-26 METHOD AND APPARATUS FOR TRANSFERING ESTIMATES OF LOCATION FROM A FIRST TRANSCEIVER TO A SECOND TRANSCEIVER
CA002386681A CA2386681C (en) 1999-10-08 2000-09-26 Method and apparatus for assigning location estimates from a first transceiver to a second transceiver
JP2001530607A JP2003511991A (en) 1999-10-08 2000-09-26 Method and apparatus for transferring a position estimate from a first transceiver to a second transceiver
FI20020648A FI114577B (en) 1999-10-08 2002-04-04 Method and apparatus for transmitting position estimates from a first transmitter receiver to a second transmitter receiver
SE0201040A SE0201040D0 (en) 1999-10-08 2002-04-05 Method and apparatus for transferring position estimates from a first transceiver to a second transceiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/415,591 US6275707B1 (en) 1999-10-08 1999-10-08 Method and apparatus for assigning location estimates from a first transceiver to a second transceiver
US09/415,591 1999-10-08

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WO2001027649A1 true WO2001027649A1 (en) 2001-04-19

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US (1) US6275707B1 (en)
JP (1) JP2003511991A (en)
KR (1) KR100517005B1 (en)
CN (1) CN1217202C (en)
BR (1) BR0014275B1 (en)
CA (1) CA2386681C (en)
FI (1) FI114577B (en)
SE (1) SE0201040D0 (en)
WO (1) WO2001027649A1 (en)

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EP1267175A2 (en) * 2001-06-11 2002-12-18 Hewlett-Packard Company Location determination using location data items received by short-range communication
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CA2386681A1 (en) 2001-04-19
FI114577B (en) 2004-11-15
FI20020648A (en) 2002-04-29
BR0014275A (en) 2002-05-21
US6275707B1 (en) 2001-08-14
CA2386681C (en) 2004-06-01
CN1378651A (en) 2002-11-06
KR100517005B1 (en) 2005-09-27
JP2003511991A (en) 2003-03-25

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