WO2011044950A1 - Identification d'un dispositif - Google Patents

Identification d'un dispositif Download PDF

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Publication number
WO2011044950A1
WO2011044950A1 PCT/EP2009/063607 EP2009063607W WO2011044950A1 WO 2011044950 A1 WO2011044950 A1 WO 2011044950A1 EP 2009063607 W EP2009063607 W EP 2009063607W WO 2011044950 A1 WO2011044950 A1 WO 2011044950A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless
network
enabled
devices
received
Prior art date
Application number
PCT/EP2009/063607
Other languages
English (en)
Inventor
John Deryk Waters
Original Assignee
Hewlett-Packard Development Company, L.P.
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 Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/EP2009/063607 priority Critical patent/WO2011044950A1/fr
Publication of WO2011044950A1 publication Critical patent/WO2011044950A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/27—Monitoring; Testing of receivers for locating or positioning the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • Identifying and connecting to a nearby, desired, wireless-enabled device is a continuing and frequently difficult problem for the user. It often requires user intervention to manually identify and select the device to which the user wants to connect.
  • Various techniques to aid this process have been explored, such as using a near-touch process using near-field communication techniques for example. However, these techniques generally rely on some out-of-band method for choosing a target device, and consequently add cost and complexity to an existing system.
  • Figure 1 a is a schematic representation of a transmitter and receiver positioned a distance d from one another;
  • Figure 1 b is a graph depicting how K-factor varies with distance d for the scenario depicted in figure 1 a;
  • Figure 2a is a graph showing Rician fading bounds for a laboratory environment;
  • Figure 2b is a graph showing Rician fading bounds for a domestic environment
  • Figure 3 is a schematic representation of a model for a complex scenario with multiple reflectors
  • Figure 4 is a graph depicting 99% fading bounds for analytic and Monte- Carlo Rician fading for the scenario depicted in figure 3;
  • Figure 5 is a graph depicting the probability contours for 1 and 75 frequency sample simulations
  • Figure 6 is a graph depicting the probability of correct detection for various numbers of frequency samples, with a desired device 1 .5m from a receiver;
  • Figure 7 is a graph showing 99% contours for devices with different transmit powers.
  • Figure 8 is a schematic representation of the positioning of a directional antenna within the body of a printer.
  • Figure 1 a is a schematic representation of a transmitter and receiver positioned a distance d from one another.
  • a reflecting surface is positioned such that it reflects a portion of the signal transmitted from the transmitter, resulting in an additional signal received at the receiver. If the distance d is varied then a K-factor as shown in figure 1 b is obtained.
  • Figure 1 b is a graph depicting how K-factor varies with distance d for the scenario depicted in figure 1 a.
  • Two environments are i) a home environment, i.e. a typical domestic environment constructed of timber and brick with only sparsely located metallic items such as radiators and consumer electronic equipment, and ii) a laboratory environment comprising test equipment with largely metallic suspended floors and ceilings.
  • a reflection coefficient of 0.7 is used to the laboratory environment, and 0.4 for the domestic environment.
  • FIG. 2a is a graph showing Rician fading bounds for a laboratory environment as described above.
  • Figure 2b is a graph showing Rician fading bounds for a domestic environment as described above.
  • Figure 3 is a schematic representation of a model for a complex scenario in which there are multiple reflectors which are randomly positioned within a defined space.
  • a Monte-Carlo simulation can be performed using the scenario of figure 3. For each Monte-Carlo trial, n reflected rays are randomly placed within the defined space, each reflector having a reflection coefficient between zero and an upper limit.
  • Figure 5 shows the benefit of averaging signal strength over a number of frequencies.
  • the distance that the unwanted device must be beyond the wanted device reduces by nearly 50% when averaging over 75 frequencies for example.
  • Figure 6 shows the effect on the probability of correctly identifying the nearest device, located in this example at 1 .5m from the receiver, when changing the number of frequency samples; when increasing from one to five frequency samples the rate of failing to detect the nearest device is decreased by 70%, with little benefit to be gained from using more than five frequency samples.
  • a nearby, desired, wireless-enabled device by determining an average signal strength over a number of frequency channels centred around the central frequency of communication for the devices in question.
  • a frequency-hopping system such as Bluetooth
  • the nearby desired wireless-enabled device will communicate over a sequence of frequency channels as required by the system's air-interface protocol specification.
  • an average power estimation can be made using power measurement data recorded during the communication on each of the channels used.
  • a device can therefore determine the nearest wireless network enabled to it by measure the average received signal strength the over a range of frequencies.
  • the device can measure the received power at at-least 5 separate frequencies spaced across the 2.4- 2.483GHz band, and average the measurement. This will reduce the rate of incorrect detection of the nearest device by up to 70%.
  • a receiver of the device can also implement a received-power threshold above which devices must be detected for the nearest-device detection algorithm to operate. This will ensure that reliability of detection is maintained at a sufficiently high level so as not to cause false triggers and hence degrade the user experience.
  • WLAN systems that do not use a frequency-hopping scheme do however typically specify communication over pre-defined frequency channels.
  • 802.1 1 specifies (in North America for example) 1 1 frequency channels spaced across the 2.4GHz band.
  • 802.1 1 specifies (in North America for example) 1 1 frequency channels spaced across the 2.4GHz band.
  • a wireless network enabled device to be discovered can therefore have some directionality added to its wireless transmitting antenna, such that there will be a small amount of directionality to the signal transmitted by the wanted device.
  • antenna There are many types of antenna that provide directionality of the degree desired, and typical of these is the patch antenna such as described by Ramesh et al (Design formula for inset fed microstrip patch antenna, Ramesh, M.; Yip, K.B., Journal of Microwaves and Optoelectronics (2003), pp5-10, the contents of which are incorporated herein by reference in their entirety).
  • Such an antenna may be placed in the front facing part of the wireless network enabled device as shown in Figure 8. It may also be placed in any other part of the wireless network enabled device such that the radiation from the antenna is predominantly greater out the front of the device than out of the rear, sides, top or bottom of the device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé permettant d'identifier un dispositif activé pour un réseau sans fil dans un environnement qui comprend une pluralité de ces dispositifs ; le procédé comprend l'actionnement d'un processeur d'un dispositif récepteur pour effectuer des opérations comprenant pour chaque dispositif activé pour un réseau sans fil dans la plage du dispositif récepteur, la réception d'une pluralité de signaux transmis, chacun positionné autour d'une fréquence centrale respective d'une transmission pour le dispositif activé pour le réseau sans fil en question, la détermination d'une mesure moyenne pour la force du signal reçu sur le dispositif récepteur pour les dispositifs respectifs des dispositifs activés pour le réseau sans fil à l'aide des forces de signaux définis depuis les signaux respectifs parmi la pluralité de signaux reçus et à l'aide de la mesure moyenne permettant de déterminer le dispositif activé pour le réseau sans fil le plus proche sur le dispositif récepteur.
PCT/EP2009/063607 2009-10-16 2009-10-16 Identification d'un dispositif WO2011044950A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/063607 WO2011044950A1 (fr) 2009-10-16 2009-10-16 Identification d'un dispositif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/063607 WO2011044950A1 (fr) 2009-10-16 2009-10-16 Identification d'un dispositif

Publications (1)

Publication Number Publication Date
WO2011044950A1 true WO2011044950A1 (fr) 2011-04-21

Family

ID=42312645

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/063607 WO2011044950A1 (fr) 2009-10-16 2009-10-16 Identification d'un dispositif

Country Status (1)

Country Link
WO (1) WO2011044950A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040236850A1 (en) * 2003-05-19 2004-11-25 Microsoft Corporation, Redmond, Washington Client proximity detection method and system
US20050227724A1 (en) * 2004-04-12 2005-10-13 Chieh-Chih Tsai Wireless network and method for determining nearest wireless device
WO2009087521A1 (fr) * 2008-01-09 2009-07-16 Koninklijke Philips Electronics, N.V. Procédé et système de découverte de dispositif sans fil dans un réseau sans fil utilisant des antennes directives
US20090232120A1 (en) * 2008-03-12 2009-09-17 Texas Instruments Incorporated Sorting frequency arrays to account for multi-protocol frequencies

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040236850A1 (en) * 2003-05-19 2004-11-25 Microsoft Corporation, Redmond, Washington Client proximity detection method and system
US20050227724A1 (en) * 2004-04-12 2005-10-13 Chieh-Chih Tsai Wireless network and method for determining nearest wireless device
WO2009087521A1 (fr) * 2008-01-09 2009-07-16 Koninklijke Philips Electronics, N.V. Procédé et système de découverte de dispositif sans fil dans un réseau sans fil utilisant des antennes directives
US20090232120A1 (en) * 2008-03-12 2009-09-17 Texas Instruments Incorporated Sorting frequency arrays to account for multi-protocol frequencies

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