KR20150077241A - method for transferring a product information using time spreading slot index assign algorism at Electronic Shelf Label system - Google Patents

Abstract

The present invention relates to a method for transferring product information using time spreading slot index assignment algorism at an electronic shelf label system. A tag address which corresponds one to one to a slot number which corresponds to each of slots existing in a PBI which represents the number of slots existing in a CBI × the number of CBIs existing in a SPBI × the number of SPBIs existing in a PBI, is successively assigned to each of slot indexes with a constant number interval. Thereby, according to bitmap data which includes a payload message of a CBI among the CBIs or CBs in a CBI, product information is transmitted to a corresponding ESL tag. The power consumption of ELS tags is low and transmission efficiency is improved.

Description

[0001] The present invention relates to a product information transferring method using a time extension slot index allocation algorithm in an electronic shelf label system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting product information between an ESL coordinator and an ESL tag in an electronic shelf label system (hereinafter simply referred to as "ESL"), And a method of transmitting product information in synchronization with a tag at a specific time.

In the conventional electronic shelf label system, ESL gateways simultaneously transmit data notification signals to all ESL tags having the same product group ID through a wakeup channel, and ESL tags having the same product group ID are transmitted from the ESL gateway in the sleep mode state After receiving the data announcement signal, it activates itself and switches to the wake-up mode state, prepares to receive the product information, and then sends an activation request completion signal to the ESL gateway.

After receiving the activation request completion signal from the ESL tags, the ESL gateway switches from the talk-up channel to the data channel and transmits the product information to the ESL tags in the wake-up mode state via the data channel.

However, in the above-described conventional electronic shelf label system, since all the ESL tags having the same product group ID are switched from the sleep mode to the up-up mode at a constant cycle, the ESL tags that do not need to receive the product information are also transmitted in the sleep mode Up mode, which causes power consumption in the ESL tags and causes a decrease in the transmission speed.

Also, when a data change request is received at a specific time in ESL tags having the same product group ID, the probability of occurrence of a communication error due to communication interference and communication interference due to adjacent address allocation is intensified.

In order to solve the above problems, it is an object of the present invention to provide a method of assigning a corresponding address to an ESL tag using a time extension slot index allocation algorithm and synchronizing with an ESL coordinator at a specific time, to be.

In the electronic shelf label system of the present invention, the product information transmission method using the time extension slot index assignment algorithm is a method in which the ESL coordinator transmits a product information to all ESL tags existing in a store in a predetermined beacon period Product information is transmitted to the corresponding ESL tag according to the bitmap data contained in the payload message of each of the child beacons located between one sub-prime beacon period and another sub-prime beacon period among the number of the sub-prime beacon periods .

In the electronic shelf label system according to the present invention, the merchandise information transmission method using the time extension slot index assignment algorithm is characterized in that the payload message of each of the child beacons includes a plurality of child beacons between one sub-prime beacon period and another sub- And among the beacon periods, between one child beacon period and another child beacon.

In the electronic shelf label system of the present invention, when the bitmap data contained in the payload message of each of the child information beacons using the time extension slot index assignment algorithm is "1 ", the ESL coordinator transmits the corresponding ESL tag And information for transmitting the information.

In the electronic shelf label system of the present invention, when the bitmap data contained in the payload message of each of the child beacons is "0 ", the ESL coordinator transmits the corresponding ESL tag And there is no information to transmit the product information.

In the electronic shelf label system of the present invention, one prime beacon period = T × N in a product information transmission scheme using a time extension slot index assignment algorithm, where T is a time period of one slot and N is an ESL And the number of tags.

In the electronic shelf label system, each of the slots in the product information transmission scheme using the time extension slot index allocation algorithm is assigned to a corresponding slot index among a plurality of slots having a slot number.

In the electronic shelf label system, each of the slots allocated to the slot index in the product information transmission scheme using the time extension slot index allocation algorithm has one tag address corresponding to one slot number.

In the electronic shelf label system, one tag address corresponding to one slot number is sequentially allocated to each slot index at a predetermined number of intervals in the merchandise information transmission scheme using the time extension slot index allocation algorithm.

According to the product information transmission method using the time extension slot index allocation algorithm in the electronic shelf label system, low power consumption can be achieved in the ESL tag and the effect of increasing the transmission efficiency in the ESL gateway can be exhibited.

1 is a diagram illustrating a Prime Beacon Interval (hereinafter, simply referred to as "PBI") for explaining a product information transmission method using a time extension slot index assignment algorithm in the ESL system of the present invention.
FIG. 2 is a diagram illustrating a sub-Prime Beacon Interval (SPBI) and a child beacon period (hereinafter referred to as " SPBI ") for explaining a product information transmission method using a time- Child Beacon Interval: hereinafter simply referred to as "CBI").
FIG. 3 is a diagram showing a specific configuration in the CBI of FIG. 2. FIG.
4 is a diagram showing the correlation between the slot number and the tag address in Fig.
FIG. 5 is a table showing a correlation between a slot number and a tag address using a time extension slot index allocation algorithm.

Hereinafter, a detailed description will be made of a product information transmission method using a time extension slot index allocation algorithm in the ESL system of the present invention with reference to the accompanying drawings.

1 is a diagram illustrating a PBI for explaining a product information transmission method using a time extension slot index assignment algorithm in the ESL system of the present invention.

In FIG. 1, one PBI is made up of SPBIs considering the number of ESL tags, and a certain number of CBIs are included in one SPBI.

A PBI is a time period in which an ESL coordinator can transmit product information to all ESL tags present in a store.

Therefore, the number of SPBIs existing in one PBI is determined by the maximum number of ESL tags that can receive product information transmitted from the ESL coordinator. That is, as the number of ESL tags increases, the number of SPBI increases.

Also, the number of SPBIs is the same as the last serial number of the slot index. For example, assuming that the slot index has a serial number between 1 and 128, the number of SPBIs is 128.

As a result, one SPBI is a time period that can transmit product information to all ESL tags corresponding to the serial number of one slot index in the ESL coordinator.

A single SPBI contains a certain number of CBIs, for example, eight CBIs.

FIG. 2 is a diagram illustrating a relationship between SPI and CBI for explaining a product information transmission method using a time extension slot index assignment algorithm in the ESL system of the present invention.

As described above with reference to FIG. 1, one CBI is included in one SPBI.

As shown in FIG. 2, one child beacon (hereinafter simply referred to as "CB") and 15 slots are provided between one CBI and another CBI. In FIG. 1, eight CBIs are represented in one SPBI and fifteen slots are shown between one CBI and another CBI, but the present invention is not limited thereto.

FIG. 3 is a view showing the arrangement of CB and 15 slots in FIG. 2;

As can be seen from FIG. 3, one CB is provided between one CBI and another CBI, and one slot for one Contention Access Period (hereinafter simply referred to as "CAP ") and 14 Slots and the 14 slots are arranged in order of the serial number.

A CB existing between one CBI and another CBI is a beaconing message. If the bitmap data contained in the payload message of the CB is "1", the ESL coordinator contains information to transmit the product information to the corresponding ESL tag. If the bitmap data contained in the payload message of the CB is "1" If the data is "0 ", it means that the ESL coordinator does not contain the information to transmit the product information to the corresponding ESL tag. For example, if there is product information to be transmitted to the ESL tag in any one of the slots in the SPBI, the bitmap data contained in the payload message of all the CBs in the SPBI is "1 & The bitmap data contained in the payload message of all the CBs in the SPBI becomes "0 ".

CAPs arranged after CB existing between one CBI and another CBI are arbitrary slots in which ESL tags can receive multimedia data from the ESL coordinator and conversely request an address assignment to the ESL coordinator You can make a registration request.

The 14 slots arranged after CAP between one CBI and another CBI are arranged in slot number order with one slot number. As shown in FIG. 4, the 14 slots are allocated to one slot number and one tag address, respectively. That is, one slot number corresponds to one tag address, and tag addresses are assigned to each of the fourteen slots. At this time, the tag addresses assigned to each of the 14 slots are assigned with a constant number of intervals.

In other words, if the tag address "1" is assigned to the slot number 1, the tag address "129" is assigned to the slot number 2 and the tag address "257" is assigned to the slot number 3.

The formula of the tag address add = 1+ (128 x (n-1)) (slot number n = 1,2,3 ...) 128 占 (13-1) = 1 + (128 占 12) = 1 + 1536 = 1537.

As a result, as can be seen from Fig. 4, a slot number "1537"

The ESL server allocates the tag addresses so as to be evenly distributed in the PBI at regular intervals in the order in which the registration requests are received by using the time extension slot index allocation algorithm. A detailed description thereof will be given in FIG.

FIG. 5 is a table showing a correlation between a slot number and a tag address using a time extension slot index allocation algorithm.

In FIG. 5, the slot index is 1 to 128. The serial number "1" of the slot index includes 32 slots and each of the slots is assigned slot numbers 0 to 31. [

Each of the slots is assigned one tag address. At this time, the tag addresses are sequentially allocated at a predetermined number of intervals, for example, "128" A slot of slot number "2" is assigned a tag address "1 ", and a slot of slot number" 31 "is assigned a tag address" 3457 "

In the slot index "2 ", a slot of slot number" 130 "is assigned tag address" 2 " and a slot of slot number 159 is assigned tag address "3458 ".

In slot index "128 ", a slot of slot number" 3970 "is assigned tag address" 128 " and a slot of slot number "159 "

Slot numbers "0" and "16" of slot index "1", slot numbers "128" and "144" of slot index "2", slot numbers "3968"Quot;," 3984 "is CB, and the slot number" 1 "of the slot index" 1 " 3969 "and slot number" 3985 "are CAPs.

If the sequence numbers of the slot indexes are sequentially allocated, the ESL tags are concentratedly allocated at a specific time, so that the probability of occurrence of communication errors increases due to load and communication interference on the wireless communication, and when there is a large amount of transmission data, There is a possibility that the data may be collided with the data to be transmitted to the ESL tag corresponding to the next slot beyond the time period T of the slot.

However, if the serial numbers of the slot indexes are allocated by extending the serial numbers of the slot indexes at regular intervals as described above, the load on the central processing unit of the ESL coordinator can be dispersed, The product information can be transmitted stably to the ESL tag.

In addition, price information and discount price information are transmitted in an exclusive OR format when the product information is transmitted from the ESL coordinator to the ESL tag. In this case, the seed value to be substituted for the encryption in the Exclusive OR scheme may be arbitrarily selected from a value between 0 and 255 instead of a fixed value. However, the seed value is not transmitted as data, and this value can decrypt the encrypted data from the ESL tag because the ESL coordinator and the ESL tag share with each other. The price information and the discount price information encrypted and transmitted to the ESL tag are decoded again in the ESL tag.

1 to 5, if the time period of one slot is T and the number of ESL tags is N, the ESL coordinator can transmit product information to all the ESL tags existing in the store The time period PBI = T 占 N.

That is, assuming that the number of ESL tags is 5,000 and the time period PBI is 10 seconds, the time period of one slot T = N / PBI = 10s / 5,000 = 2ms.

In other words, assuming that the time period of one slot is 2 ms and the number of ESL tags is 5,000, the ESL coordinator transmits product information to all the ESL tags corresponding to the serial number of one slot index The number of time period SPBIs is 40. This means that the ESL server assigns the serial number of the slot index from "1" to "40".

One SPBI contains a certain number of CBIs, for example eight CBIs.

In addition, one CBI contains 16 slots. As a result, CBI = 16 (the number of slots) × 2 ms (T) = 32 ms. In addition, since there are eight CBIs in one SPBI, SPBI = 8 (the number of CBIs) × 32 ms (one CBI time period) = 256 ms.

And PBI = 39 (the number of SPBIs) x 256 ms (time period of one SPBI) = 9984 ms = 9.984 s.

Furthermore, the number of slots present in one PBI is

39 (the number of SPBIs existing in one PBI) x 8 (the number of CBIs existing in one SPBI) x 16 (the number of slots existing in one CBI) = 4,992.

Since the number of ESL tags is assumed to be 5,000, the remaining 8 slots (5,000 - 4,992 = 8) exist in the serial number "40" of the slot index.

The time period of the remaining eight slots existing in the serial number "40" of the slot index is 8 x 2 ms = 16 ms.

As a result, the time period PBI that can send product information to all 5,000 ESL tags in the store at the ESL coordinator is 9984ms + 16ms = 10s.

This means that the ESL coordinator is able to transmit all of the product information to 5,000 ESL tags in the store every 10s, and each of the 5,000 ESL tags is in the sleep mode with a time interval of 10s.

Each of the ESL tags in the sleep mode is switched to the wake-up mode immediately before the corresponding CB message of the corresponding SPBI time period is received, so that each of the ESL tags can receive the payload message of the CB, Up state.

In the case of 5,000 ESL tags existing in the above-mentioned store, the wake-up time is 256ms. ESL tags must receive one or more CB payload messages during a wake-up period. ESL tags compensate CBI time error by checking the beacon serial number contained in the CB payload message to calculate the value of the next sleep mode time period when CB payload message is received.

Each of the ESL tags checks the bitmap data contained in the payload message of the CB to determine whether or not the bitmap data is "1 ". If the bitmap data is" 0 ", there is no ESL tag to transmit the product information , Each of the ESL tags immediately enters the sleep mode as soon as the payload message of the CB is checked. By doing so, the ESL tag can efficiently check whether or not there is product information to be transmitted from the ESL coordinator. If the bitmap data is "0 " after the bitmap data check, each ESL tag enters the sleep mode immediately, Can be minimized.

As a result, each of the 5,000 ESL tags is in the sleep mode for 10s, then switches to the wake-up mode, and repeats that it remains in the wake-up state for 256ms.

However, this occurs in the process of initializing 5,000 ESL tags existing in the store. After the initialization, when the product information is transmitted to a specific ESL tag, the product is switched to the wake-up mode, The sleep mode is changed to the sleep mode.

Thus, as described above, the power in the ESL tags is consumed at low power because it is kept in the sleep mode.

Claims (10)

ESL Coordinator can transmit product information to all ESL tags existing in the store. Time period of each item of SPBI among the predetermined number of SPBIs existing in PBI and CBs between SPBIs And the product information is transmitted to the corresponding ESL tag according to the bitmap data contained in the load message. The product information transmission method using the time extension slot index assignment algorithm in the electronic shelf label system. The method according to claim 1,
Wherein the payload message of each of the CBs is present between one CBI and another CBI among a plurality of CBIs between one SPBI and another SPBI. Product Information Transmission Method Using Assignment Algorithm. The method according to claim 1 or 2,
Wherein when the bitmap data contained in the payload message of each of the CBs is "1 ", the ESL coordinator stores information for transmitting the item information to the corresponding ESL tag. Product Information Transmission Method Using Algorithm. The method according to claim 1 or 2,
When the bitmap data contained in the payload message of each of the CBs is "0 ", there is no information to transmit the item information to the corresponding ESL tag in the ESL coordinator. In the electronic shelf label system, Product information transmission method using. The method of claim 2,
Wherein the time period PBI = T x N, where T is the time period of one slot and N is the number of ESL tags present in the store. In the electronic shelf label system, Transmission method. The method of claim 5,
And one slot is one of a plurality of slots existing between one CBI and another CBI. In the electronic shelf label system, a product information transmission method using a time extension slot index assignment algorithm. The method of claim 6,
The number of slots existing in one PBI is the number of SPBIs existing in one PBI, the number of CBIs existing in one SPBI, and the number of slots existing in one CBI. Product Information Transmission Scheme Using the Extension Slot Index Allocation Algorithm. The method of claim 7,
Wherein each slot has a slot number and is assigned to a corresponding slot index among a plurality of slots in a plurality of slots. The method of claim 8,
Wherein each of the slots allocated to the slot index has one tag address corresponding to one slot number in one-to-one correspondence. The method of claim 9,
Wherein one tag address corresponding to one slot number is sequentially allocated to each of the slot indices with a predetermined number of intervals, and wherein the product information transmission method using the time extension slot index allocation algorithm in the electronic shelf label system.

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