WO2009094033A1 - Procédé et système de gestion d'étiquetages électroniques - Google Patents

Procédé et système de gestion d'étiquetages électroniques Download PDF

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Publication number
WO2009094033A1
WO2009094033A1 PCT/US2008/052024 US2008052024W WO2009094033A1 WO 2009094033 A1 WO2009094033 A1 WO 2009094033A1 US 2008052024 W US2008052024 W US 2008052024W WO 2009094033 A1 WO2009094033 A1 WO 2009094033A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
data
server
data device
base stations
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2008/052024
Other languages
English (en)
Inventor
Yasushi Yamao
Satoshi Takahishi
Akihiko Fukasawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Electro Communications NUC
Optoelectronics Co Ltd
Opticon Inc
Original Assignee
University of Electro Communications NUC
Optoelectronics Co Ltd
Opticon 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 University of Electro Communications NUC, Optoelectronics Co Ltd, Opticon Inc filed Critical University of Electro Communications NUC
Priority to PCT/US2008/052024 priority Critical patent/WO2009094033A1/fr
Priority to JP2010544286A priority patent/JP5191549B2/ja
Publication of WO2009094033A1 publication Critical patent/WO2009094033A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/08—Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
    • G06Q10/087—Inventory or stock management, e.g. order filling, procurement or balancing against orders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access

Definitions

  • the present invention relates generally to a system for wirelessly managing a plurality of remote data devices and a method for use therein. More particularly, the invention is applicable to managing electronic shelf label (ESL) systems of the type commonly used in supermarkets and department stores.
  • ESL electronic shelf label
  • ESLs Electronic shelf labels
  • ESLs find use in merchandising establishments and warehouses to display pricing and other information and to manage inventory. For example, in a supermarket, ESLs might be mounted visibly on the shelves for different items. As item prices change, the new prices can be displayed "instantaneously".
  • ESLs are clustered in groups, each group is serviced wirelessly by a respective base station, and the base stations are connected to an ESL server.
  • a base station may, for example, communicate with the ESLs via radio.
  • Many factors interfere with the reliable operation and management of ESLs in such a system. For example, the physical construction and layout of the establishment can present transmission and reception difficulties between the base stations and the ESLs.
  • ESLs may arise from the physical construction of the premises or the operation of the ESLs. For example, it is known that standing waves may arise within physical locations, creating dead spots for transmission and reception. In addition, ESLs may be at various distances from their respective base station, and the more remote units may operate marginally. It is also important to be able to detect poor operation or failure of an ESL as soon as possible.
  • Each base station communicates wirelessly with the ESLs in its group, all of which are within the operating range of the base station.
  • the server communicates with different base stations in repetitive, non-overlapping time periods.
  • the data devices carry on a two way communication with a base station. Should they receive data correctly, they respond with an acknowledge signal. Should the data not be received correctly, I will make a further attempt until the data is received correctly or until it has been received incorrectly a predetermined number of times.
  • each time data is re-transmitted to an ESL it is done at a different carrier frequency.
  • the communication from an ESL to its base station is delayed in the case of failures, until there is a successful reception or the predetermined numbers of attemps have been made.
  • a single signal from the base station to the server may then combine the results of all attempts for a single or plural ESLs.
  • a base station will attempt to transmit to an ESL three times, preferably with carrier frequencies of 2.4 one GHz, 2.45 GHz and 2.49 GHz.
  • the server will control the carrier frequencies applied to particular ESLs by the base stations, based upon historical data regarding the effectiveness or ineffectiveness of certain carrier frequencies for the ESLs.
  • ESLs which are in the range of a plurality of base stations are given identification (ID) in each base station. Under control of the server, when data communication fails or is marginal in one base station, communication may be attempted in another base station. This not only improves reliability of communication, but permits maintenance of the best available communication through adaptive control.
  • intelligent power control of base stations may be utilized with respect with ESLs having distance problems.
  • the server would have a history of the success and power levels for various base stations with distant ESLs and, in addition to switching ESLs between base stations would control the power of the signal provided by the base station to those ESLs.
  • the base station is illustrated as reporting to the server after it has addressed all of the ESLs.
  • Those skilled in the art will appreciate that it will also be possible to report on individual ESLs in real time. In that case, a report would be sent to the server after each of blocks 110 and blocks 116, before returning to block 112, and bock 112 will go directly to block 122.
  • FIG. 1 is a functional block diagram of a system S embodying the present invention
  • FIG. 2 is a timing chart illustrating how N groups of data devices communicate in accordance with one aspect of the invention
  • FIG. 3 is timing chart illustrating how a base station and its ESLs communicate interactively in accordance with another aspect of the invention
  • FIG. 4 is a flow chart useful for providing more detailed explanation of a preferred communication process in accordance with the invention
  • FIG. 5 is a schematic diagram of illustrating a method for improving data reception by fringe ESLs, in accordance with another aspect of the invention
  • FIG. 6 is a schematic representation of a preferred method for dealing with the occurrence of a standing wave in a site containing a system embodying the invention
  • FIG.7 is a timing chart illustrating the operation of an alternate embodiment for a system in accordance with the present invention.
  • FIG. 1 is a functional block diagram of a system S embodying the present invention.
  • the system comprises a server 10 and base stations 1...N, each associated with an ESL group (groups 1...N).
  • Each base station communicates wirelessly with a plurality of ESLs.
  • base station 1 is dedicated to ESLs 1-1 through 1-m
  • base station 2 is dedicated to ESLs 2-1 through 2-n
  • base station N is dedicated to ESLs N-I through N-p.
  • each ESL is associated with a respective article, which is on a shelf or in a location serviced by the ESL.
  • the base stations have nominal, associated operating ranges R 1 ... R N AS may be seen ESL 1-m is at the edge of range Ri and overlaps slightly into range R 2
  • the different groups communicate in repetitive non-overlapping, dedicated periods, in order to avoid interference between them.
  • FIG. 2 is a timing chart illustrating the N groups communicating in this manner.
  • the ESLs of two groups are so far apart that there is not likely to be any interference between the signals in the two groups, they may transmit simultaneously.
  • FIG. 2 it may be seen that data transmission in group 2 will not start until data transmission in group 1 ends.
  • the time delay between consecutive group transmissions would be in the order of .1 seconds, so that one round of transmission to all N groups will be completed in just a few seconds, even if many groups exist.
  • the ESLs acknowledge receipt of new data.
  • This is illustrated in the timing chart of FIG. 3, illustrating a data update for a base station 22 which includes three ESLs , 24 , 26, and 28.
  • server 10 transmits three sets of data, D l, D_2 and D_3 containing new information for ESLs 24, 26 and 28, respectively.
  • This data is received by base station 22, which forwards the data to the respective ESLs.
  • ESLs 24 26 and, 28 receiving the data at consecutive times.
  • ESLs 24, 26, and 28, respectfully transmit an ACK (acknowledge) signal to base station 22 indicating that they have received new data (assuming that they did receive the data correctly), and base station 22 then signals the acknowledge information to ESL server 10 , where it is stored in appropriate storage 27 .
  • ACK acknowledgement
  • FIG. 4 is a flow chart useful for providing a more detailed explanation of the transmission process just described. The process starts at block 100, and data is sent from the server to each base station at block 102. The remaining steps illustrate the operation of an individual base station, but all base stations can be assumed to operate in a similar matter.
  • the base station addresses the first ESL, and it sends data to that ESL at blocks 106.
  • the ESL upon correctly receiving the data, sends an acknowledgement signal (ACK) back to the base station.
  • ACK acknowledgement signal
  • the base station performs a test to determine whether it has received an ACK signal from the ESL. If so, it records a success for that ESL at block 110, and control is transferred to block 112. Should the base station determine at block 108 that it has not received an ACK signal from the ESL, a test is performed at block 114 to determine whether the data has been sent to that ESL i times (the system selects an appropriate value for i, preferably 3). If it is determined at block 114 that the data has been sent i times, a failure is recorded for that ESL at block 116, and control is transferred to block 112. Should it be determined that block 114 that the data has not been sent i times, control transfers to block 106, where the base station sends the data to the ESL an additional time.
  • a test is performed to determine whether all ESLs have been addressed. If not, control transfers to block 118 where the base station addresses the next ESL and then to block 106 for data transmission to the new ESL. Should it be determined at block 112 that all ESLs have been addressed, this means that the data has been sent to each ESL and success or failure has been recorded. Control is then transferred to block 120 where the base station prepares a report and sends it to the server. The process then ends at block 122.
  • each base station has received data from the server and has transmitted it to each of its ESLs. It has determined whether an ESL actually received the data and, if it did not, retransmitted the data to the ESL a predetermined number of times before declaring a failure. The results of the process were then reported to the server. In accordance with the present invention, various steps may then be taken to achieve reception by any ESL that failed to receive the data.
  • ESL 1-m is at the fringe of the range Ri of group 1 , but it is also within the range R 2 of group 2, at the fringe of group 2.
  • the schematic diagram of FIG. 5 illustrates a method for improving data reception by fringe ESLs, such as ESL 1-m.
  • the ESL is registered with and given an identification (ID) in each of the groups, for example an ID 40 in group 1 and an ID 42 is group 2. Should data transmission fail in the first group, it will be attempted again in the second group.
  • ID identification
  • an ESL can have an ID in any number of adjacent groups. That is, it is not limited to two groups. In each case, as an ESL is addressed to additional groups, the likelihood of correct reception of data increases.
  • intelligent control of the transmission power of the base stations by the server can be simultaneously utilized. For example, when transmission to an ESL is switched from one base station to another, an adjustment in transmission power level would be made, based upon accumulative history. Thus, the server would control the base stations for group 1 and group 2 in the above example to use the best transmission power for an ESL when it is switched between the two groups.
  • special steps are taken to achieve the reception of data by an ESL which is in a "dead spot."
  • One reason for the occurrence of such dead spots is that transmission at certain frequencies will cause a standing wave to arise as a result of the structure of the establishment.
  • FIG. 6 is a schematic representation of a method for dealing with this problem.
  • a base station 30 is attempting to send data to an ESL 32.
  • base station 30 might attempt transmission i (for example 3) times if it does not receive an ACK signal from the ESL.
  • each time base station 30 retransmits the data to ESL 32, it does so at a different carrier frequency.
  • the default transmission frequency might be f 1.
  • the retransmission of data would occur at frequency f2, and a further retransmission would occur at f3, etc. Since the occurrence of dead spots is primarily a frequency phenomenon, it is likely to be eliminated by changing the carrier frequency.
  • the three frequencies are 2.41 GHZ, 2.45 GHZ and 2.49 GHZ.
  • ESL 32 is failing to receive the data because of interference from nearby equipment, changing the transmission frequency is also likely to reduce or eliminate that interference.
  • the present technique should improve data transmission whenever failures are based upon a frequency phenomenon.
  • the respective base station could be adaptively controlled to transmit to that ESL at a carrier frequency which works well the most consistently.
  • an ESL could be controlled and so as not to send at a frequency that has been found to be ineffective.
  • the server would have a record of such information would control the base station accordingly.
  • FIG.7 is a timing chart illustrating an alternate embodiment in accordance with the present invention. This should be compared to the timing chart of FIG. 3, and the operation of the system is similar except as explained below. In this case, more power efficient operation of the system is obtained by permitting the base stations and the ESLs to operate in a "sleep" mode when transmission and reception of data are not necessary. This is accomplished through the use of a beacon signal, which precedes any other information sent from server 20 to base station 22. After the communication process, such as that of FIG. 4, is completed, a base station and its ESLs will time out and drop into a sleep mode. When server 20 transmits a beacon signal 29, the base station will awake and relay a beacon signal to each of its ESLs 24, 26, 28.
  • the base station and its ESLs are then in a standby mode, and when server 20 thereafter sends the new data, operation will proceed as previously described with respect to the timing chart of FIG. 3.
  • the beacon signal is built on a time base controlled in relationship to an accurate reference clock, such as one sent via GPS. It is contemplated that the beacon signal could include more than simply a start signal. For example, when retransmission of data are done at different frequencies, as illustrated in FIG. 6, ACK signals storage 27 will have a history of which transmission frequencies operate best for each ESL.
  • the beacon signal could also include information from the base stations regarding intelligent power control. Prior to generating the beacon signal at the particular base station , the server could therefore prepare instructions for base station regarding which nominal frequencies are to be used for transmission to each ESL and the sequence of frequencies to be used for retransmissions. These instructions could then be incorporated in the beacon signal, so that when the new data is received, a base station will be preset to transmit to each of its ESLs with the optimum frequencies.
  • each ESL is illustrating as reporting an ACK signal in the instances in which multiple transmissions to an ESL are utilized to improve reliability of reception, for example, as illustrated in FIG.
  • an ESL may, in fact, be reporting a failure (NACK signal) at one or more of the transmission frequencies.
  • the base station could send a single signal combining the information (ACK or NACK) relating to all of the frequencies transmitted to a particular ESL.
  • the actual pricing data to be conveyed to the ESL devices may be set at the server, or if desired, at the base stations.
  • the Communications between the ESL devices and the base stations and server may use any protocol, and the system may operate using one or more servers.

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  • Business, Economics & Management (AREA)
  • Economics (AREA)
  • Engineering & Computer Science (AREA)
  • Marketing (AREA)
  • Quality & Reliability (AREA)
  • Finance (AREA)
  • Entrepreneurship & Innovation (AREA)
  • Human Resources & Organizations (AREA)
  • Accounting & Taxation (AREA)
  • Operations Research (AREA)
  • Development Economics (AREA)
  • Strategic Management (AREA)
  • Tourism & Hospitality (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un système de gestion d'étiquetages électroniques comprend un serveur et une pluralité de stations de base, qui sont chacune associées à un groupe d'étiquetages électroniques (ESL). Chaque station de base communique sans fil avec les ESL de son groupe, qui se trouvent tous dans la portée de la station de base. De préférence, le serveur communique avec différentes stations de base sur des périodes de temps répétitives et qui ne se chevauchent pas.
PCT/US2008/052024 2008-01-25 2008-01-25 Procédé et système de gestion d'étiquetages électroniques Ceased WO2009094033A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2008/052024 WO2009094033A1 (fr) 2008-01-25 2008-01-25 Procédé et système de gestion d'étiquetages électroniques
JP2010544286A JP5191549B2 (ja) 2008-01-25 2008-01-25 電子棚札管理システム及びそれにおける無線通信方法

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Application Number Priority Date Filing Date Title
PCT/US2008/052024 WO2009094033A1 (fr) 2008-01-25 2008-01-25 Procédé et système de gestion d'étiquetages électroniques

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Cited By (8)

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EP2372619A1 (fr) * 2010-03-30 2011-10-05 Samsung Electro-Mechanics Co., Ltd Système d'étiquette électronique d'étagère, procédé de synchronisation d'étiquette électronique d'étagère avec un produit et procédé d'actualisation des informations du produit
JP2014507912A (ja) * 2011-03-10 2014-03-27 マリセンス オーワイ 電子価格ラベルシステムにおける情報の転送
JP2014183496A (ja) * 2013-03-19 2014-09-29 Ishida Co Ltd 無線表示システム
WO2017191358A1 (fr) * 2016-05-04 2017-11-09 Mariella Labels Oy Système d'étiquettes de prix électroniques
US20190147425A1 (en) * 2016-05-04 2019-05-16 Mariella Labels Oy Electronic price label system
CN113597006A (zh) * 2021-07-26 2021-11-02 努比亚技术有限公司 一种电子价签通讯方法、系统及计算机可读存储介质
CN115315000A (zh) * 2022-08-26 2022-11-08 努比亚技术有限公司 一种服务器寻呼价签的方法、设备及计算机可读存储介质
EP4322668A4 (fr) * 2022-05-09 2024-08-21 Hanshow Technology Co., Ltd. Procédé d'attribution dynamique d'une fréquence à une station de base, et système d'étiquette de prix et dispositif informatique

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JP2015038681A (ja) * 2013-08-19 2015-02-26 ホーチキ株式会社 無線防災システム
CN116782337B (zh) * 2022-03-11 2024-03-12 汉朔科技股份有限公司 对群组电子价签进行查询应答的方法及系统
CN119862903B (zh) * 2025-03-25 2025-07-18 杭州智控网络有限公司 电子货架标签定位系统及方法

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US20060156160A1 (en) * 2002-01-11 2006-07-13 Ncr Corporation Methods and apparatus for error detection and correction of an electronic shelf label system communication error

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US20050215280A1 (en) * 2000-12-22 2005-09-29 Twitchell Jr Robert W Lprf device wake up using wireless tag
US20040246929A1 (en) * 2001-05-02 2004-12-09 James Beasley Reducing mutual channel interference in frequency-hopping spread spectrum wireless communication systems, such as bluetooth systems
US20060156160A1 (en) * 2002-01-11 2006-07-13 Ncr Corporation Methods and apparatus for error detection and correction of an electronic shelf label system communication error
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372619A1 (fr) * 2010-03-30 2011-10-05 Samsung Electro-Mechanics Co., Ltd Système d'étiquette électronique d'étagère, procédé de synchronisation d'étiquette électronique d'étagère avec un produit et procédé d'actualisation des informations du produit
JP2014507912A (ja) * 2011-03-10 2014-03-27 マリセンス オーワイ 電子価格ラベルシステムにおける情報の転送
JP2014183496A (ja) * 2013-03-19 2014-09-29 Ishida Co Ltd 無線表示システム
WO2017191358A1 (fr) * 2016-05-04 2017-11-09 Mariella Labels Oy Système d'étiquettes de prix électroniques
WO2017191359A1 (fr) * 2016-05-04 2017-11-09 Mariella Labels Oy Système d'étiquettes de prix électroniques
US20190147425A1 (en) * 2016-05-04 2019-05-16 Mariella Labels Oy Electronic price label system
US12169818B2 (en) * 2016-05-04 2024-12-17 Mariella Labels Oy Simultaneously displaying new prices linked to products via an electronic price label system
CN113597006A (zh) * 2021-07-26 2021-11-02 努比亚技术有限公司 一种电子价签通讯方法、系统及计算机可读存储介质
EP4322668A4 (fr) * 2022-05-09 2024-08-21 Hanshow Technology Co., Ltd. Procédé d'attribution dynamique d'une fréquence à une station de base, et système d'étiquette de prix et dispositif informatique
CN115315000A (zh) * 2022-08-26 2022-11-08 努比亚技术有限公司 一种服务器寻呼价签的方法、设备及计算机可读存储介质

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JP2011510596A (ja) 2011-03-31

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