Source: http://www.google.com/patents/US7069025?dq=5,778,372
Timestamp: 2014-12-18 22:12:34
Document Index: 197542736

Matched Legal Cases: ['Application No. 60', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11']

Patent US7069025 - Methods and apparatus for identifying asset location in communication networks - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with signal decoders to time-stamp communication...http://www.google.com/patents/US7069025?utm_source=gb-gplus-sharePatent US7069025 - Methods and apparatus for identifying asset location in communication networksAdvanced Patent SearchPublication numberUS7069025 B2Publication typeGrantApplication numberUS 09/926,516Publication dateJun 27, 2006Filing dateNov 14, 2001Priority dateNov 14, 2000Fee statusPaidAlso published asCA2398779A1, CA2398779C, CA2398781A1, CA2419796A1, CA2419796C, CN1311652C, CN1500323A, CN1568599A, CN1636413A, CN100466851C, DE60141283D1, DE60142846D1, DE60144487D1, EP1334578A2, EP1334578B1, EP1336277A2, EP1336277B1, EP1336310A2, EP1336310B1, US7030811, US7030812, US7250906, US20020059535, US20020097182, US20020098852, US20060125690, US20060160545, WO2002041504A2, WO2002041504A3, WO2002041545A2, WO2002041545A3, WO2002041545A9, WO2002041651A2, WO2002041651A3Publication number09926516, 926516, US 7069025 B2, US 7069025B2, US-B2-7069025, US7069025 B2, US7069025B2InventorsDavid P. Goren, Christopher D HookOriginal AssigneeSymbol Technologies, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (37), Non-Patent Citations (5), Referenced by (23), Classifications (312), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethods and apparatus for identifying asset location in communication networksUS 7069025 B2Abstract The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with signal decoders to time-stamp communication sequences. Cellular wireless networks may be frequency-multiplexed to increase spatial time-stamping density. Tags may be attached to passive assets to provide location identification information to network devices. Locations of assets broadcasting standard 802.11 radio frequency structures may be identified. Noise inherent in correlating a communication sequence may be reduced by using a selected correlation function.
CROSS REFERENCE TO RELATED APPLICATION This claims the benefit of U.S. Provisional Patent Applications Nos. 60/270,254, filed Feb. 20, 2001, and 60/248,357, filed Nov. 14, 2000, both now abandoned which are hereby incorporated by reference herein in their entireties.
Some embodiments of the invention may include a tag that may be attached to a mobile article that may be present in or near a communication network. Tags are described in U.S. Patent Application No. 60/248,357, filed Nov. 14, 2000, which is hereby incorporated by reference herein in its entirety. The tag may be configured to provide location identification information to the network. The location identification information may include data in any format suitable for the network. For example, the tag may transmit 802.11 compatible data. In some embodiments, a tag may be configured to wait a predetermined period of time, detect the presence of radio frequency energy (e.g., using an energy detector) on a network channel, and, if the radio frequency energy is substantially less than a predetermined threshold, transmit the location identification information to the network. The tag may wait in a �sleep� mode. The sleep mode may require reduced power. The sleep mode may be interrupted by a timer within the tag. The sleep mode may be interrupted by a �wake-up� call from a network terminal.
In step 720, the network may receive using Group II devices a communication sequence broadcast on frequency f2 by the wireless asset. Processes in steps 725�735, involving Group II devices and a communication sequence received on frequency f2, may be analogous to the processes in steps 705�715, involving Group I devices and a communication sequence received on frequency f1. In step 740, the network may receive using Group III devices a communication sequence broadcast on frequency f3 by the wireless asset. Processes in steps 745�755, involving Group III devices and a communication sequence received on frequency f3, may be analogous to the processes in steps 705�715, involving Group I devices and a communication sequence received on frequency f1. In step 760, a network processor may identify the location of the wireless asset using one or more of the solution sets generated in steps 715, 735, 755. If only one solution step is generated in steps 715, 735, and 755, collectively, more information may be required to identify the wireless asset location. Step 760 may be followed by a return to step 700 to begin a new multi-frequency time-stamping cycle.
may include signal R′(t). R′(τ) may include concatenated D(t) information symbols. For example, R′(t) may be the concatenation of the 3 consecutive symbols (each denoted by a �+�) shown in FIG. 12.
In some embodiments, the buffered binary data may be analyzed to detect the presence of a favorable pattern of information symbols in step 1560. In step 1570, a correlation function such as C(τ), including a reference signal such as R(t), may be evaluated. (Although steps utilizing C(τ)and R(t) are shown and discussed in connection with FIGS. 15�17 for the sake of simplicity, the scope of FIGS. 15�17 and their description herein includes corresponding steps utilizing C′(τ) and R′(t), when concatenated information symbols are selected as a reference function, instead of C(τ) and R′(t), respectively.)
Each of Examples 1�5 in FIG. 17 includes a buffer having a size N of 12 bits holding a segment of decoded data signal D(t). Each symbol in D(t) is represented by a �+� or a �−�, to indicate a positively polarized symbol or a negatively polarized symbol, respectively (following the convention used in FIGS. 12 and 13). M is a set of symbols that may be present in D(t). P is a subset of bits that may be present in M and which may be targeted for correlation with a reference signal R(t). Each symbol in R(t) is represented by a �+� to indicate a positively polarized symbol. Although FIG. 17 shows R(t) having only positively polarized symbols, R(t) may include one or more negatively polarized symbols if necessary. In some embodiments, R(t) may be a sequence of information symbols that is identical to the sequence of information symbols present in P.
The system may detect sequences in the demodulated data signal using steps 1820 and 1830. The system may decode the demodulated data signal at step 1820 using, for example, a 1-symbol correlator. The decoding correlator may be similar to or identical to a 1-symbol correlator that may be used in step 1822. As demodulated data stream through the decoder in step 1820, the resulting bits may be stored in a buffer for sequence detection in step 1830. After a sequence is detected, a correlation signal (e.g., produced in steps 1822�1828) based on a reference signal known to correlate strongly with the detected sequence may be selected in step 1840. Steps 1832�1838 are multipath processing steps (�MPP,� in FIG. 18) that may be used to filter multipath signals out of correlation signals produced in steps 1822�1828, respectively.
In some embodiments, the system may define a TOA estimate in steps 1832�1838 using leading edge detection, channel estimation, or a combination thereof. (Leading edge detection and channel estimation are discussed above, particularly in connection with FIGS. 15 and 15A.) In these embodiments, step 1840 may involve selecting a TOA estimate from the results of steps 1832�1838. In these embodiments, it may not be necessary in step 1850 to determine a TOA estimator such as {circumflex over (τ)}to define a TOA estimate.
In step 2210, clocks of network TOA estimation devices to be used for wireless asset location identification may be synchronized to a selected network time signal or counter. In step 2220, a first TOA estimation device may receive a communication sequence from the wireless asset and generate TOA1, (a first TOA estimate). In step 2230, TOA1 may be referenced to network time. In step 2240, a second TOA estimation device may receive the communication sequence and generate TOA2, (a second TOA estimate). TOA2 may be referenced to network time in step 2250. In step 2260, a TDOA may be calculated using TOA1 and TOA2. A set of possible wireless asset locations may then be generated in step 2270. Steps 2210�2260 may be repeated to generate one or more additional solution sets of possible wireless asset locations.
FIG. 23 shows illustrative steps that may be performed when multiple TOA estimation devices may provide multiple TDOA estimates. In step 2310, TOA estimates generated in connection with a broadcast communication sequence may collected. In step 2320, a TOA estimation device may be designated as a reference TOA estimation device. In step 2330, TOA's from nonreference TOA estimation devices may be used in conjunction with the TOA generated by the reference system to calculate a TDOA for each of the nonreference systems. In some embodiments, more than one reference system may designated. In step 2340, each TDOA may be used to generate an asset location solution set. In step 2350, solution sets that are physically unreasonable or impossible (�out-of-bounds�), degraded by noise, or otherwise inferior may discarded. In step 2360, if at least two solution sets remain after selections are made in step 2350, wireless asset location may be identified using the remaining solution sets and a solution estimation method such as least squares estimation, maximum likelihood estimation, noise-weighted maximum likelihood estimation, or any other suitable estimation method. If fewer than 2 solution sets remain after step 2350, the process may proceed with step 2370, in which no location is identified.
FIG. 24 shows illustrative correlation signals CA(τ) and CB(τ) associated with a communication sequence broadcast by a wireless asset. The communication signal may be received by multiple TOA estimation devices, each of which may generate a correlation signal. For example, CA(τ) and CB(τ) may be generated using TOA estimation devices such as A and B, respectively, shown in FIG. 21. CA(τ) and CB(τ) may be similar to C(τ) shown in FIG. 12. In FIG. 25, CA and CB depend on the time variables τA and τB, respectively, which may be referenced to internal clocks or counters in systems A and B, respectively. These internal clocks may be synchronized so that τA and τB are synchronized and referenced to the same standard. CA may have peaks CA 1 , CA 2 , CA 3 , and CA 4 , for example, corresponding respectively to TOA estimators {circumflex over (τ)}A 1 , {circumflex over (τ)}A 2 , {circumflex over (τ)}A 3 , and {circumflex over (τ)}A 4 . CB may have peaks CB 1 , CB 2 , CB 3 and CB 4 , for example, respectively corresponding to TOA estimators {circumflex over (τ)}B 1 , {circumflex over (τ)}B 2 , {circumflex over (τ)}B 3 , and {circumflex over (τ)}B 4 . The estimators may be determined using equation 1. Multiple TDOA's may be generated using pairs of TOA estimators including estimators from both systems A and B. For example, TDOA1, shown in FIG. 24, may be generated from {circumflex over (τ)}A 1 and {circumflex over (τ)}A 2 . TDOA2 may be generated from {circumflex over (τ)}A 2 and {circumflex over (τ)}B 1 . Although four TDOA's are shown in FIG. 24, some embodiments may generate more than four TDOA's. Although the TDOA's shown in FIG. 24 are based on TOA estimates such as {circumflex over (τ)}A 1 and {circumflex over (τ)}B 1 , some embodiments may use TOA estimates based on leading edge detection, channel estimation, or a combination thereof for calculating an average TDOA. The TDOA's shown in FIG. 24 may be referred to as �preliminary TDOA's�. In some embodiments, the average of the preliminary TDOA's may be used to generate a solution set of possible asset locations for the wireless asset as discussed in reference to FIGS. 21�23.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5119104May 4, 1990Jun 2, 1992Heller Alan CLocation system adapted for use in multipath environmentsUS5150310 *Aug 30, 1989Sep 22, 1992Consolve, Inc.Method and apparatus for position detectionUS5365516Aug 16, 1991Nov 15, 1994Pinpoint Communications, Inc.Communication system and method for determining the location of a transponder unitUS5525081Jul 20, 1994Jun 11, 1996Pinpoint CorporationTransducer system for trolling motorUS5526357Jul 18, 1994Jun 11, 1996Pinpoint Communications, Inc.Communication system and method for determining the location of a transponder unitUS5596330Feb 16, 1995Jan 21, 1997Nexus Telecommunication Systems Ltd.Differential ranging for a frequency-hopped remote position determination systemUS5764188Apr 24, 1997Jun 9, 1998Motorola, Inc.Method and apparatus for location finding in a wireless communication systemUS5890068Oct 3, 1996Mar 30, 1999Cell-Loc Inc.Wireless location systemUS6121926Nov 19, 1999Sep 19, 2000WherenetRadio geo-location system with advanced first received wavefront arrival determinationUS6127976Sep 2, 1999Oct 3, 2000Wherenet, Inc.Distributed network for multi-lateration with circularly polarized antenna for hemispherical coverageUS6150921Oct 17, 1997Nov 21, 2000Pinpoint CorporationArticle tracking systemUS6268723Sep 24, 1998Jul 31, 2001Wherenet CorporationMagnetic field emission and differential receiver coil configuration for discriminating response magnetic field from transponder tagUS6308428Dec 22, 1998Oct 30, 2001Pinpoint Laser SystemsLaser alignment systemUS6317082Feb 14, 2000Nov 13, 2001Wherenet CorpWireless call tag based material replenishment systemUS6459704 *Aug 12, 1997Oct 1, 2002Spectrum Tracking Systems, Inc.Method and system for radio-location determinationEP0748084A1May 29, 1996Dec 11, 1996General Electric CompanyProtocol and mechanism for primary and mutter mode communication for asset trackingWO1998016849A1Oct 17, 1997Apr 23, 1998Colin LanzlArticle tracking systemWO1999067737A1Jun 24, 1999Dec 29, 1999Pinpoint CorpDual mode tracking systemWO2000011590A1Aug 20, 1999Mar 2, 2000Pinpoint CorpMethod and apparatus for transmitting data in a tracking systemWO2000014561A1Sep 2, 1999Mar 16, 2000Wherenet IncNetwork for multi-lateration with circularly polarized antennaWO2000023956A1Oct 22, 1999Apr 27, 2000Univ MarylandMethod and system for providing location dependent and personal identification information to a public safety answering pointWO2000046771A1Feb 1, 2000Aug 10, 2000Pinpoint CorpTechnique for filtering signals in a local positioning systemWO2000048016A1Feb 14, 2000Aug 17, 2000Wherenet IncWireless call tag based material replenishment systemWO2000052498A1Mar 2, 2000Sep 8, 2000Pinpoint CorpMethod and apparatus combining a tracking system and a wireless communication systemWO2001006401A1Jul 14, 2000Jan 25, 2001Pinpoint CorpMethod and apparatus for mobile tag readingWO2001007928A1Jul 27, 2000Feb 1, 2001Wherenet CorpRgv (reader geometry visualization) toolWO2001015070A2Aug 25, 2000Mar 1, 2001Pinpoint CorpMethod and apparatus for locating mobile tagsWO2001029574A2Oct 23, 2000Apr 26, 2001Pinpoint CorpMethod and apparatus for low cost asset locationWO2001043419A2Nov 10, 2000Jun 14, 2001Pango Networks IncSystems, devices and methods for use in proximity-based networkingWO2001050299A2Dec 17, 2000Jul 12, 2001Pango Systems B VSystem and method for incremental disclosure of personal information to content providersWO2001061465A1Feb 13, 2001Aug 23, 2001Thomas M BaconElapsed time clock for part call tag-based replenishment systemWO2001061883A2Feb 16, 2001Aug 23, 2001Pinpoint CorpMethod and apparatus for integrating wireless communication and asset locationWO2001067043A1Mar 6, 2001Sep 13, 2001Donald K BelcherUltra-sensitive magnetic field receiver capable of operating in high noise environmentsWO2001067128A2Mar 5, 2001Sep 13, 2001Donald K BelcherGeolocation system combined with wireless communicationWO2001067341A1Mar 7, 2001Sep 13, 2001Thomas E TurnerTransactions and business processes executed through wireless geolocation system infrastructureWO2001074021A1Mar 27, 2001Oct 4, 2001Bahrenburg StefanMethod for signaling the start of a logical channel in a jointly used physical transmission channel of a radio communications systemWO2001082520A2Apr 27, 2001Nov 1, 2001Wherenet CorpDtoa location processor* Cited by examinerNon-Patent CitationsReference1"IEEE Standard Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specification. (ISO/IEC 8802-11, ANSI/IEEE STD 802.11-1999) Chapter 11: MAC Sublayer Management Entity" ISO/IEC 8802-11, ANSI/IEEE STD 802.11, Aug. 20, 1999, pp. 123-137, XP002207975 p. 125, Paragraph 11.2.2.4; Figures 67, 68; Table 23.2"IEEE Standard Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specification. (ISO/IEC 8802-11, ANSI/IEEE STD 802.11-1999) Chapter 14: Frequency-Hopping Spread Spectrum (FHSS) PHY Specification for the 2.4 GHz . . . " ISO/IEC 8802-11, ANSI/IEEE STD 802.11, Aug. 20, 1999 pp. 148-194, XP002207976 pp. 157, Paragraph 14.3.3.2-p. 160, Paragraph 14.3.3.2.2; Figures 77, 78.3"IEEE Standard Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specification. (ISO/IEC 8802-11, ANSI/IEEE STD 802.11-1999) Chapter 15: Direct Sequence Spread Spectrum (DSSS) PHY Specification for the 2.4 GHz Band . . . " pp. 223, Paragraph 15.4.8.4.4"IEEE Standard Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specification. (ISO/IEC 8802-11, ANSI/IEEE STD 802.11-1999) Chapter 7: Frame Formats" ISO/IEC 8802-11, ANSI/IEEE STD 802.11, Aug. 20, 1999 pp. 34-58, XP002206839 pp. 42-43, Paragraph 7.2.1.4 Figure 19.5"IEEE Standard Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specification. (ISO/IEC 8802-11, ANSI/IEEE STD 802.11-1999) Chapter 9: MAC Sublayer Functional Description" ISO/IEC 8802-11, ANSI/IEEE STD 802.11, Aug. 20, 1999 pp. 70-97, XP002207974 pp. 70, Paragraph 9-Page 76, Paragraph 9.2.4.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7221913 *Jun 23, 2004May 22, 2007Intel CorporationEffective time-of-arrival estimation algorithm for multipath environmentUS7551089Jul 21, 2005Jun 23, 2009Automated Tracking Solutions, LlcMethod and apparatus for tracking objects and peopleUS7606524 *May 20, 2005Oct 20, 2009Rockwell Collins, Inc.Integrated monitoring and communications receiver architectureUS7817604 *Jun 13, 2005Oct 19, 2010Telefonaktiebolaget L M Ericsson (Publ)Shared control channel detection strategiesUS7826538 *Aug 31, 2007Nov 2, 2010Dgi Creations, LlcRemote determination of network transmitter identity and output strengthUS7834765Mar 16, 2009Nov 16, 2010Automated Tracking Solutions, LlcMethod and apparatus for tracking objects and peopleUS7834766Apr 3, 2009Nov 16, 2010Automated Tracking Solutions, LlcMethod and apparatus for tracking objects and peopleUS7877101 *Dec 28, 2007Jan 25, 2011Marvell International Ltd.Locating a WLAN station using signal propagation delayUS7996020 *Jan 25, 2011Aug 9, 2011Marvell International Ltd.Locating a WLAN station using signal propagation delayUS8355739Aug 5, 2011Jan 15, 2013Marvell International Ltd.Method and apparatus for locating a WLAN station based on a propagation delay of a signalUS8437698 *Feb 26, 2010May 7, 2013Huawei Technologies Co., Ltd.Method and apparatus for estimating time of arrivalUS8526395Sep 7, 2010Sep 3, 2013L-3 Communications CorporationUsing code channel overrides to suppress CDMA wireless devicesUS8538373May 25, 2011Sep 17, 2013Blackbird Technologies, Inc.Methods and apparatus for emergency trackingUS8626183 *Nov 26, 2004Jan 7, 2014Koninklijke Philips N.V.Positioning method and apparatusUS8680988Mar 26, 2012Mar 25, 2014Blackbird Technologies Inc.Mobile asset tracking unit, system and methodUS8682351 *Jan 15, 2013Mar 25, 2014Marvell International Ltd.Method and apparatus for locating a WLAN station based on a propagation delay of a signalUS8700313Jan 13, 2012Apr 15, 2014Blackbird Technologies, Inc.Mobile unit and system having integrated mapping, communications and trackingUS8755770Aug 10, 2009Jun 17, 2014L-3 Communications CorporationMethods for identifying wireless devices connected to potentially threatening devicesUS8767595Aug 10, 2009Jul 1, 2014L-3 Communications CorporationEnhanced methods of cellular environment detection when interoperating with timed interfersUS20090149198 *Jul 30, 2008Jun 11, 2009Electronics And Telecommunications Research InstituteSystem and method for tracking positionUS20100226308 *Aug 15, 2007Sep 9, 2010Comhouse Wireless Lpnode- arbitrated media access control protocol for ad hoc broadcast networks carrying ephemeral informationUS20100227560 *Feb 26, 2010Sep 9, 2010Huawei Technologies Co., Ltd.Method and apparatus for estimating time of arrivalWO2013142550A1 *Mar 20, 2013Sep 26, 2013Digimarc CorporationPositioning systems for wireless networks* Cited by examinerClassifications U.S. Classification455/456.2, 340/10.42, 370/445, 455/517, 342/450, 455/456.5, 455/70, 340/10.2, 340/8.1International ClassificationH04W48/08, G01S5/02, H04J3/06, G01S1/02, H04W56/00, G04G7/02, G01S5/12, H04L7/00, H04N5/64, H04N9/31, H04W60/00, H04N7/01, H03M13/03, H04L12/26, H04N5/907, H04N21/41, G11B20/22, H04W24/10, H04W4/16, H04M1/66, H04N7/16, H04L25/02, H04B14/00, H04L25/497, H04N5/66, H04N5/38, H04B1/707, H03M13/23, H04W88/06, H04W8/24, H04L27/156, H04W4/10, H04W4/14, G11B20/14, H04N9/64, H04W84/08, H04W12/10, H04N5/74, H04W84/12, H04L27/18, H04L29/06, H04W36/04, H04W28/08, H04M3/22, H04W12/06, H01Q21/24, H04W76/06, H04Q3/00, H04M1/725, H04W24/00, H04B17/00, H04W28/02, H04N7/52, H01Q1/24, H04W88/04, H04W8/16, G06T9/00, H04W8/26, H04N5/225, H04W28/22, G02B26/10, H04H60/72, H04L9/32, H04W4/06, G06K17/00, 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INC, NEW YORKFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GOREN, DAVID P.;HOOK, CHRISTOPHER D.;REEL/FRAME:012507/0012;SIGNING DATES FROM 20010103 TO 20011217RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google