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US9271235B2 - Transferring of information in electronic price label systems - Google Patents

Transferring of information in electronic price label systems Download PDF

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Publication number
US9271235B2
US9271235B2 US14/351,444 US201214351444A US9271235B2 US 9271235 B2 US9271235 B2 US 9271235B2 US 201214351444 A US201214351444 A US 201214351444A US 9271235 B2 US9271235 B2 US 9271235B2
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Prior art keywords
message
electronic
base station
frequency band
label
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US20140256372A1 (en
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Hannu Karhuketo
Jarmo Kivinen
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Marisense Oy
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Marisense Oy
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Assigned to MARISENSE OY reassignment MARISENSE OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KARHUKETO, HANNU, KIVINEN, JARMO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower where the power saving management affects multiple terminals
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10415—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/18—Casings, frames or enclosures for labels
    • G09F3/20—Casings, frames or enclosures for labels for adjustable, removable, or interchangeable labels
    • G09F3/204—Casings, frames or enclosures for labels for adjustable, removable, or interchangeable labels specially adapted to be attached to a shelf or the like
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/18—Casings, frames or enclosures for labels
    • G09F3/20—Casings, frames or enclosures for labels for adjustable, removable, or interchangeable labels
    • G09F3/208—Electronic labels, Labels integrating electronic displays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/59—Responders; Transponders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04W72/0426—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to electronic price label systems comprising at least one base station and plurality of electronic labels.
  • the invention relates especially to transferring of information between base stations and electronic labels.
  • the price information on price tags in shops is always changed manually when the price of the product is changed.
  • the new prices are printed out on paper or a corresponding material, and these tags with their new price markings are placed manually in a location reserved for the price tags on shelves in the sales premises.
  • an employee must first find the correct location of the price tag to be updated, after which the previous price tag is removed and discarded and the new price tag is inserted in its position.
  • a disadvantage in this arrangement is, among other things, the fact that the arrangement is very laborious and there is a high risk of mistakes. In case of a mistake, a situation may, for example, occur, in which the price information on the price tags on the shelves conflicts with the price information in the cash register system.
  • Wireless systems do not require complex wirings but, in turn, they require transponders equipped with antennas in connection with battery-driven price displays, for communicating with the control unit of the system via suitable communication means.
  • one method in the communication between the communication means and the electronic price labels is such in which the transducer placed in the electronic price labels does not, by itself, implement active radio transmission so that the transmission power would be supplied from a separate power supply of the electronic price label, but the electronic price label only reflects the radio transmission of the communication means at a given moment of time and in a given way.
  • the electronic price label can change the reflectance of its own antenna, wherein the electronic price label is capable of acknowledging or responding to messages of the communication means by simple reply messages.
  • the communication means communicate with the electronic price labels by transmitting signals which are listened to by all the electronic price labels and from which a single electronic price label identifies a command relating to itself on the basis of a given electronic price label specific identification.
  • the single electronic price label responds to the communication means by reflecting the transmission of the communication means itself back to the communication means, changed by a phase shift caused by a given time delay and at a given moment of time.
  • the communication means starts to transmit, for example, a carrier wave of a given type for a given period of time, the carrier wave being reflected back, with a given phase shift, by the price display that recognized the command.
  • the communication means is capable of identifying the reflected response as belonging to a given price display, because it knows to expect it within a given period of time after sending a unique command to said display. From its own transmission, the communication means can separate the reflected response that is significantly weaker in power, on the basis of the phase shift produced by the display device.
  • the solution of the invention is to use two different frequency bands in transmission of information from base stations to electronic labels and from electronic labels to base stations.
  • First frequency band is used to send a first message from base station to electronic label or labels.
  • a second message is sent to electronic label using a second frequency band.
  • the electronic label can send a third message, e.g. an acknowledgement or response, to the base station using the second frequency band.
  • the first frequency band is a higher band than the second frequency band.
  • the electronic label is battery powered, it can't use very high power in transmissions.
  • the coverage of the electronic label can be improved even when it's using low power in transmissions when comparing to the case when the electronic label would use higher frequency band for its transmissions.
  • Another benefit of the present invention is that also the amount interference is reduced between the messages from electronic labels to base stations and from base stations to electronic labels because they are sent using different frequency bands.
  • the first frequency band is lower frequency band than the second frequency band.
  • the advantages of the present invention are e.g. better reception of the messages from electronic labels to base stations if the second frequency band has less interference or fading than the first frequency band. In these cases higher band should be used for messages from electronic labels to base station.
  • One further advantage of the invention is that because the reception quality of base stations and electronic labels is improved. This way the number of base stations can be kept minimum and at the same time costs and complexity of the system are also kept low.
  • FIG. 1 presents an example embodiment of an electronic price label system according to the present invention
  • FIG. 2 presents an example embodiment of the electronic price label according to the present invention
  • FIG. 3 presents a side view of an example embodiment of the electronic price label according to the present invention
  • FIG. 4 presents an exemplary message sequence chart for communication between electronic label and the base station
  • FIG. 5 presents an exemplary method according to the present invention for transferring information simultaneously on two base stations
  • FIG. 6 presents an exemplary hardware implementation according to the present invention.
  • FIG. 7 presents another exemplary hardware implementation according to the present invention.
  • FIG. 1 shows a schematic and simplified view of an arrangement according to the invention in a supermarket or in corresponding sales premises.
  • Product shelves 1 are equipped with shelf rails 2 , on which electronic price labels 5 a equipped with, for example, electrophoretic laminate displays 3 and product information 4 are placed in locations corresponding to products.
  • the laminate display 3 is arranged to display the price of the product, and the product information 4 contains, among other things, the name of the product and possibly some other information relating to the product.
  • hanging electronic price labels 5 b forming a display pocket, which also comprise both an electrophoretic laminate display 3 and product information 4 .
  • Each electronic laminate display 3 constitutes a thin price tag equipped with display segments and resembling a paper price tag, in which the required product prices and other necessary symbols are formed by changing the colour of the substantially two-coloured display segments.
  • One layer of the display is, for example, an active ink layer.
  • the ink layer contains a number of microcapsules filled with liquid and containing, for example, substantially black particles with a positive surface charge and substantially white particles with a negative surface charge, whose location in the microcapsules is controlled by an electric field so that at the desired display segments, the black particles are on top, wherein said display segments look black when viewed from above, and at the other display segments, the white particles are on top, wherein these display segments look white when viewed from above.
  • the background of the display consists of the same microcapsules, wherein, for example, the price information can be displayed as dark numbers against a light background, or vice versa, if desired.
  • a display used can be, for example, the electrophoretic microcapsule display laminate disclosed in Finnish patent application No. FI 20050192.
  • the system comprises at least a base station 7 equipped with communication means 6 , such as a radio transmitter, via which it is possible to transmit, for example, updated price information and other control information to the electronic price label 5 a , 5 b .
  • the system may comprise scanners 8 located at cash registers and connected to the cash register system, for scanning the price, wherein the cash register system and the electronic price labels always have the same up-to-date information on the prices of the products.
  • the base station 7 may be coupled to other controlling and supporting systems. The wireless connection between the base station 7 and the electronic price labels 5 a , 5 b is illustrated with arrows 9 .
  • the application of the invention is not limited solely to price displays that employ display technology of the above-described kind, but it is obvious that the price displays can, as such, be implemented by applying any known technology.
  • the invention is expressly related to improving wireless radio communications by using two frequency bands for transferring information.
  • the invention is not limited solely to improving performance of radio communications by using two bands for transferring the information in electronic labels systems, but the invention can also be applied in radio communications between other electronic devices. Consequently, the examples presented herein and focusing on price displays must be considered as examples but not the sole embodiments of the invention.
  • FIGS. 2 and 3 show, in more detail, one example of the type of the electronic price label 5 a attached to a shelf rail 2 .
  • the power source 10 is arranged to supply electric energy to the electronic price label 5 a and its display driver 14 .
  • Price information or other information shown on the display 3 by means of the receiver 11 and the display driver 14 can be updated in a wireless manner from the base station 7 .
  • the updating and control data is transmitted by means of radio waves, but also other ways of data transmission are feasible.
  • Each display laminate 3 constitutes a thin price tag equipped with display segments 12 and resembling a paper price tag, on which the required product prices and other necessary symbols are formed by changing the colour of substantially two-coloured display segments 12 .
  • the colour of the display segments 12 as well as of the background 13 is changed by means of an electric field formed by electric current, as described above.
  • the electronic price labels 5 a , 5 b comprise mode changing means 17 for changing the mode of the antenna of the receiver 11 between at least two different modes, whereby, for example in the first mode, the reflectance of the antenna is good and, in the second mode, the reflectance is poor.
  • the antenna modes can be adjusted by the mode changing means 17 so that the antenna reflects radio waves in different phases in the different modes. Consequently, the electronic price label 5 a , 5 b is fitted to vary the mode of the antenna of its receiver 11 to produce a reflection encoded in a given way and having a time delay varying according to the antenna mode.
  • the communication means 6 interpret the different time delays as encoded data signals transmitted by the electronic price label 5 a , 5 b , on the basis of which, for example, the communication means 6 identify each electronic price label.
  • the above-mentioned encoding implies, in its simplest form, that the electronic price label 5 a , 5 b reflects back the carrier wave transmitted by the communication means 6 , which may have a frequency of, for example, 868 MHz so that the electronic price label 5 a , 5 b grounds the antenna of the receiver 11 by means of the mode changing means 17 at the frequency of, for example, 150 kHz, thereby producing a kind of square wave from the reflected signal.
  • the electronic price label 5 a , 5 b thus affects the reflected signal by changing the mode of the antenna 11 .
  • the phase shift of the signal would be preferably 180 degrees, at which the detection of a low-powered reflection by the communication means 6 is at its best.
  • the present invention improves this radio communication, which happens between the electronic labels and base station(s) by using two different frequency bands in transmission of information from base stations to electronic labels and from electronic labels to base stations.
  • one frequency band is used for messages from base stations 7 to electronic labels 5 a , 5 b , e.g. for first message, and one frequency band for messages from electronic labels 5 a , 5 b to base station, e.g. for second and third message.
  • second message uses a second frequency band because it's later or simultaneously used by electronic label for sending a response to the base station by reflecting back, i.e. backscattering, the second message.
  • FIG. 4 presents an example message sequence chart of communication between a base station 7 and an electronic label 5 a , 5 b .
  • the electronic labels 5 a , 5 b are in deep sleep mode during most of the time. In the deep sleep mode the battery consumption is much lower than in the active operation.
  • the electronic labels 5 a , 5 b wake up from deep periodically to listen if there is broadcast of the base station 7 .
  • the base station 7 can send optional idle messages to wake up the electronic labels 5 a , 5 b . If idle messages are used, the electronic label 5 a , 5 b activates the listening mode when it receives the idle-message.
  • the idle messages can be for example broadcast messages that contain no payload and no specific identification information of any electronic label 5 a , 5 b.
  • the base station 7 When the electronic labels 5 a , 5 b are in listening mode the base station 7 sends a first message containing identification information of the electronic label 5 a , 5 b the base station 7 wants to send a message to.
  • the first message is sent using a first frequency band.
  • the message may contain payload or other information, e.g. new price information to be displayed in the display of the electronic label 5 a , 5 b .
  • the electronic label 5 a , 5 b that is wanted to be contacted receives the message and recognizes its own identification information. After receiving the first message comprising e.g. new price information to be displayed the electronic label 5 a , 5 b stores the information.
  • the base station 7 starts to transmit a second message, for example, a carrier wave of a given type for a given period of time, the carrier wave being reflected back as an acknowledgement, with a given phase shift, by the electronic label 5 a , 5 b that recognized the command.
  • the second message is sent using a second band.
  • the second message contains only carrier wave.
  • the electronic label 5 a , 5 b can answer the message by sending e.g. a third message as described below on the second frequency band.
  • the electronic label 5 a , 5 b reflects back the carrier wave transmitted by the base station 7 , which may have a frequency of, for example, 685 MHz so that the electronic label 5 a , 5 b grounds the antenna of the receiver 11 by means of the mode changing means 17 at the frequency of, for example, 150 kHz, thereby producing a kind of square wave from the reflected signal.
  • the electronic label 5 a , 5 b thus affects the reflected signal by changing the mode of the antenna. In this reflection, the phase shift of the signal would be preferably 180 degrees, at which the detection of a low-powered reflection by the base station 7 is at its best. Sending the acknowledgement can also take place simultaneously to the sending of the second message.
  • the first frequency band is higher than the second frequency band.
  • the first frequency band can be for example 2.4 GHz ISM band and the second frequency band can be for example 868 MHz ISM band.
  • the first frequency band can be for example 869.5 MHz ISM band and the second frequency band can be for example 868 MHz ISM band.
  • path loss of the uplink signal is twice the path loss of the downlink signal because the uplink signal is a reflection of the original signal.
  • path loss of higher frequency band is not a problem because base stations 7 can use high power in transmitting the messages.
  • the first frequency band is lower band than the second frequency band.
  • the advantages of the present invention are e.g. that it enables better reception of the messages from electronic labels to base stations if the second frequency band has less interference or fading than the first frequency band. In these cases higher band should be used for messages from electronic labels to base station.
  • the frequencies of the first and second frequency band can be changed during operation of the system with each other. This means that if first frequency band was originally higher frequency band than the second frequency band, it can be changed so that first frequency band uses lower frequency band than the second frequency band. This change can be done e.g. based on signal quality measurements, signal level measurement or interference measurements.
  • One criterion that can be used for selecting used frequency bands for first frequency band and second frequency band can be for example that frequencies which offer better conditions for transmitting signals are used for messages from electronic labels to base stations.
  • the frequencies used by first and second frequency bands can also be changed with each other e.g. if there is fading or interference with messages from electronic labels to base station or vice versa. The change can be done once, when the signal quality requires, periodically or with some different criteria.
  • the first base station sends a first transmission from first base station to electronic label(s) (downlink) on a frequency f2 from the first frequency band.
  • the electronic label After that the electronic label sends a first transmission to the first base station (uplink) on a frequency f1 from the second frequency band and at the same time the second base station can send a first transmission in downlink on the frequency f2 without interference to the uplink transmission of the electronic label on frequency f1.
  • the first base station can then send another transmission in downlink on frequency f2 and at the same time electronic label can send a first transmission uplink to the second base station on frequency f1 without interference to the transmission of the first base station.
  • the two or more base stations and electronic labels can continue communication in this synchronized manner without interfering each other's transmissions.
  • the uplink messages from the electronic labels to base stations can require a transmission from base station according to FIG. 4 (second and third message) e.g. if backscattering is used.
  • the electronic label can have wideband RF-circuit and an antenna that has radiating resonances at two frequencies.
  • the base station according to one embodiment of the present invention can have dual band synthesizer which has separate outputs for the two bands, that can be used separately and/or simultaneously.
  • the transmitter of the base station can have one or two RF chains. When there are two RF-chains they are combined with a duplexer or a switch.
  • the receiver of the base station can be configured to duplex or switch the received signal to two chains.
  • the antenna on the base station can be a dual frequency antenna that radiates at both used frequency bands.
  • the base station comprises an antenna 600 for sending and receiving RF signals on two bands, a bandpass filter 601 , a low noise amplifier 602 , a mixer 603 for converting the received signal to a suitable frequency for A/D converter, an antialiasing filter 604 for A/D converter, an A/D (analog to digital) converter 605 , a signal processing and control module 606 for digital signal, the module 606 can be realized by e.g. FPGA (field programmable gate array), a modulator 607 for modulating the downlink carrier frequency, a power amplifier 608 and a dual PLL frequency synthesizer 610 for generating the needed carrier frequencies.
  • FPGA field programmable gate array
  • FIG. 7 present a more detailed exemplary hardware implementation of the base station e.g. for the embodiment of FIG. 5 .
  • the base station comprises an antenna 700 for sending and receiving RF signals on two bands, a bandpass filter 701 , a low noise amplifier 702 , a mixer 703 for converting the received signal to a suitable frequency for A/D converter, an antialiasing filter 704 for A/D converter, an A/D (analog to digital) converter 705 , a signal processing and control module 706 for digital signal, the module 706 can be realized by e.g. FPGA (field programmable gate array), a modulator 707 for modulating the downlink carrier frequency, a power amplifier 708 and a dual PLL frequency synthesizer 710 for generating the needed carrier frequencies.
  • FPGA field programmable gate array
  • the invention relates thus to a method for transferring information in an electronic price label system, the electronic price label system comprising at least one base station 7 and a plurality of electronic labels 5 a , 5 b for transferring information between the base station 7 and electronic labels 5 a , 5 b wherein the base stations 7 and the electronic labels 5 a , 5 b comprise at least communication means.
  • the method comprises: sending first message from base station 7 to electronic label 5 a , 5 b using a first frequency band, after sending the first message, sending a second message from base station 7 to electronic label 5 a , 5 b using second frequency band, and sending a third message from electronic label 5 a , 5 b to base station 7 using a second frequency band.
  • the third message is an acknowledgement message to the first message.
  • the third message is sent from electronic label to base station by reflecting back the second message to base station.
  • the first frequency band is higher frequency band than the second frequency band.
  • the first frequency band is 2.4 GHz ISM-band and the second frequency band is 868 MHz ISM-band.
  • information to be transferred comprises price information to be displayed by the electronic price label 5 a , 5 b or control information for the electronic price label 5 a , 5 b.
  • the invention relates also to an electronic price label of an electronic price label system, the electronic price label system comprising at least one base station 7 and a plurality of electronic labels 5 a , 5 b .
  • the electronic label 5 a , 5 b comprises at least communication means.
  • the electronic label 5 a , 5 b is configured to receive a first message on a first frequency band, after receiving the first message, to receive a second message on a second frequency band and to send a third message on a second frequency band.
  • the electronic price label further comprises an electrophoretic laminate display 3 .
  • communication means comprise transmitter and receiver.
  • the electronic price label 5 a , 5 b is configured to send by reflecting back a received message.
  • the invention relates also to a base station of an electronic price label system, the electronic price label system comprising at least one base station 7 and a plurality of electronic labels 5 a , 5 b .
  • the base station 7 comprises at least communication means.
  • the base station 7 is configured to send a first message on a first frequency band and after sending the first message to send a second message at a second frequency band and to receive a third message on the second frequency band.
  • communication means comprise transmitter and receiver.
  • the third message is an acknowledgement message to the first message from electronic label 5 a , 5 b to base station 7 .
  • the invention relates also to an electronic price label system, comprising at least one base station 7 and a plurality of electronic labels 5 a , 5 b wherein the base stations 7 and the electronic labels 5 a , 5 b comprise at least communication means and information is transferred between the base stations 7 and electronic labels 5 a , 5 b .
  • the base station 7 or the base stations are configured to send a first message at a first frequency band and after sending the first message to send second message at a second frequency band and to receive a third message on the second frequency band.
  • the electronic labels 5 a , 5 b are configured to receive first message at the first frequency band and after receiving the first message to receive a second message at the second frequency band and to send a third message at the second frequency band.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cash Registers Or Receiving Machines (AREA)
US14/351,444 2011-10-13 2012-10-10 Transferring of information in electronic price label systems Active US9271235B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20116014 2011-10-13
FI20116014A FI20116014L (fi) 2011-10-13 2011-10-13 Tiedonsiirto sähköisissä hintalappujärjestelmissä
PCT/FI2012/050974 WO2013053999A1 (fr) 2011-10-13 2012-10-10 Transfert d'informations dans des systèmes d'étiquettes de prix électroniques

Publications (2)

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WO2013053999A1 (fr) 2013-04-18
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US20140256372A1 (en) 2014-09-11
EP2766888A1 (fr) 2014-08-20
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FI20116014A0 (fi) 2011-10-13
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