WO2010098423A1

WO2010098423A1 - Data processing device, wireless terminal, data processing program, and wireless terminal program

Info

Publication number: WO2010098423A1
Application number: PCT/JP2010/053030
Authority: WO
Inventors: 治小島; 宏一守屋
Original assignee: セイコーインスツル株式会社
Priority date: 2009-02-26
Filing date: 2010-02-26
Publication date: 2010-09-02
Also published as: JP2010200080A; JP5181353B2

Abstract

Data communications can be accomplished at the required speed while reducing the power consumption by wireless terminals. A wireless communication system (1) constitutes an electronic inventory system using an administration server (2), relay devices (3), and wireless terminals (5). The administration server (2) groups the wireless terminals according to the value of the remainder resulting from dividing a unique number possessed by each wireless terminal (5) by the total number of groups defined by the administration server (2). Furthermore, the administration server (2) can dynamically manage the total number of the groups and set the optimum total number of the groups according to the usage conditions and functions of the wireless communication system (1), thus facilitating dynamic decentralized administration of the number of the wireless terminals (5) participating in the groups. In the event that the wireless terminals (5) begin transmission all at once, the total number of groups can be set to a high value, and then operation can proceed by decreasing the total number of the groups as the number of the terminals handled per basic frame decreases over time.

Description

Information processing apparatus, wireless terminal, information processing program, and wireless terminal program

The present invention relates to an information processing apparatus, a wireless terminal, an information processing program, and a wireless terminal program, and relates to, for example, a device that reduces power consumption in a wireless terminal.

In stores, shelf labels displaying product prices and the like are placed on the product shelves for customer convenience.
These shelf labels are generally created by printing on a paper medium or by handwriting, but in recent years, electronic shelf labels that display product information on a liquid crystal display unit have been used.
The electronic shelf label receives display information by infrared rays, for example, and displays it on the liquid crystal display unit.

In an electronic shelf label, it is important to reduce power consumption. As such a technique, there is a “channel search method and a communication device using the same” disclosed in Patent Document 1 below.
This technology reduces power consumption by placing a circuit in an operating state during a period when an electronic shelf label searches for a beacon from a base station and in a sleep state during other periods.

Electronic shelf labels are required to be driven by a small battery for at least several years, and a large number of electronic shelf labels may be rewritten in a short time, ensuring a quick response of electronic shelf labels. However, it was necessary to reduce power consumption.
However, conventionally, since all the wireless terminals 5 have to receive all the synchronization signals (beacons) in order to confirm the presence / absence of received data, there is a problem that power is consumed wastefully. Further, if the synchronization period is lengthened to reduce the power consumption, the response of the wireless terminal 5 is lowered.

JP2007-221392A

An object of the present invention is to secure a necessary response speed while reducing the power consumption of the wireless terminal.

In order to achieve the above object, according to the present invention, in the first aspect of the present invention, information processing is performed in which information is transmitted using a basic frame to the wireless terminal that is synchronized at intervals corresponding to the number of groups of wireless terminals. A group number determining means for determining the number of groups; a grouping means for grouping wireless terminals into the determined number of groups; and a group number notifying means for notifying the wireless terminals of the determined number of groups. A data acquisition means for acquiring data to be transmitted to the wireless terminal; and a basic frame for each group of the wireless terminals having a fixed period length is generated, and the wireless terminal to which the data is transmitted belongs to the acquired data Basic frame generation means for setting a basic frame of the group, and the generated basic frame according to a predetermined order based on the grouped group Providing information transmitting means for transmitting information by frame, the information processing apparatus characterized by comprising a.
According to a second aspect of the present invention, there is provided an information processing apparatus according to the first aspect, further comprising group notification means for notifying the wireless terminal of a group to which the wireless terminal belongs.
In the invention according to claim 3, the basic frame generation means transmits presence / absence information indicating that data to be transmitted to the wireless terminal exists in the generated basic frame before transmitting the acquired data. The information processing apparatus according to claim 1, wherein the information processing apparatus is configured as a basic frame as described above.
In the invention according to claim 4, comprising a terminal list acquisition means for acquiring a terminal list that is a list of wireless terminals that receive the acquired data, the basic frame generation means, wherein the acquired terminal list, The information processing apparatus according to claim 3, wherein the basic frame is configured to be transmitted after the presence / absence information and before the acquired data.
The invention according to claim 5 further comprises subgroup specifying means for specifying a subgroup formed in the group of wireless terminals, wherein the basic frame generating means is a subgroup to which the wireless terminals included in the terminal list belong. 5. The basic frame is configured such that subgroup specifying information for specifying a frame is transmitted after the presence / absence information and before the acquired terminal list. An information processing apparatus is provided.
According to a sixth aspect of the present invention, there is provided registration means for accepting a terminal registration request from a wireless terminal and registering the wireless terminal as a data transmission destination, wherein the group number determining means is a wireless device for making the terminal registration request. The information processing apparatus according to any one of claims 1 to 5, wherein the number of groups is changed in accordance with the number of terminals.
According to a seventh aspect of the present invention, there is provided a wireless terminal that receives information based on a basic frame generated for each group from the information processing apparatus according to the first aspect, wherein the number of groups receives the number of groups from the information processing apparatus. Receiving means, group specifying means for specifying a group to which the device belongs, synchronization interval acquiring means for acquiring a synchronization interval using the number of received groups and the specified group, and the information processing according to the acquired synchronization interval Information receiving means for receiving information transmitted by the apparatus, and at least during the period of the acquired synchronization interval, information is transmitted while basic frame information generated for a group other than the specified group is transmitted. There is provided a wireless terminal characterized by comprising a pause means.
The invention according to claim 8 provides the radio terminal according to claim 7, wherein the group specifying means specifies the group using the received number of groups.
According to the ninth aspect of the invention, there is provided presence / absence information receiving means for receiving presence / absence information indicating that data addressed to the own group exists in the basic frame, and the data does not exist according to the received presence / absence information. The wireless terminal according to

claim

7 or 8, wherein the wireless terminal is put into a sleep state by the suspension means when it is determined.
The invention according to claim 10 comprises subgroup storage means for storing the subgroup to which the apparatus belongs, and subgroup specifying information receiving means for receiving subgroup specifying information transmitted after the presence / absence information. The wireless terminal according to claim 9, wherein when the stored subgroup is different from the subgroup specified by the received subgroup specifying information, the wireless terminal is put into a sleep state by the suspension unit. .
The invention according to claim 11 comprises terminal list receiving means for receiving a terminal list which is a list of wireless terminals to which data is transmitted, which is transmitted after the subgroup specifying information, and the received terminal list The wireless terminal according to claim 10, wherein the wireless terminal is put into a sleep state by the suspension means when self does not exist.
The invention according to claim 12 is an information processing apparatus that transmits information using a basic frame to the wireless terminal that is synchronized at an interval corresponding to the number of groups of wireless terminals, the number of groups determining the number of groups. A determination function; a grouping function for grouping wireless terminals into the determined number of groups; a group number notification function for notifying the wireless terminal of the determined number of groups; and data for acquiring data to be transmitted to the wireless terminal An acquisition function; and a basic frame generation function for generating a basic frame for each group of the wireless terminals having a fixed period length, and setting the acquired data as a basic frame of a group to which the wireless terminal to which the data is transmitted belongs. An information transmission for transmitting information by the generated basic frame according to a predetermined order based on the grouped group An information processing program for realizing functions and, at the computer.
According to a thirteenth aspect of the present invention, there is provided a wireless terminal program for realizing a function of receiving information based on a basic frame generated for each group from the information processing apparatus according to the first aspect by a computer, from the information processing apparatus. A group number receiving function for receiving the number of groups; a group specifying function for specifying a group to which the group belongs; a synchronization interval acquiring function for acquiring a synchronization interval using the received group number and the specified group; An information receiving function for receiving information transmitted by the information processing device according to a synchronization interval, and information transmitted by a basic frame generated for at least a group other than the specified group in the period of the acquired synchronization interval Provide a wireless terminal program that implements a sleep function that pauses while the computer is running That.

According to the present invention, by changing the synchronization period according to the total number of groups of wireless terminals, it is possible to perform data communication at a necessary speed while reducing the power consumption of the wireless terminals.

It is the figure which showed an example of the network structure of a radio | wireless communications system. It is the figure which showed an example of hardware constitutions, such as a management server. It is the figure which showed an example of the logical structure of terminal DB. It is a figure for demonstrating the structure of a basic frame. It is a figure for demonstrating the example of transmission of the separate data by a basic frame. It is a figure for demonstrating the example of transmission of the separate data by a basic frame. It is a figure for demonstrating mode switching etc. by the total number of groups. It is a figure for demonstrating the example of a setting of a subgroup. It is a figure for demonstrating mode switching etc. by the total number of groups. It is a flowchart for demonstrating operation | movement when a management server receives a data transmission request. It is a flowchart for demonstrating the procedure in which a management server produces | generates a basic frame and transmits information. It is a flowchart for demonstrating the reception operation | movement of a radio | wireless terminal. It is a flowchart for demonstrating the procedure in which a radio | wireless terminal calculates a synchronization interval. It is a flowchart for demonstrating the change of the total number of groups accompanying participation of a radio | wireless terminal. It is a figure for demonstrating each means comprised by the management server. It is a figure for demonstrating each means comprised by the radio | wireless terminal. It is a figure for demonstrating each means comprised by the relay machine.

(1) Outline of Embodiment A wireless communication system 1 (FIG. 1) includes one management server 2, several relays 3, and a large number of fixedly installed wireless terminals 5 (electronic shelf label terminals). An electronic shelf label system is used.
The management server 2 groups the unique numbers of each wireless terminal 5 by a remainder value obtained by dividing the unique number by the total number of groups defined by the management server 2.
Furthermore, the management server 2 can dynamically manage the total number of groups and set an optimal total number of groups according to the usage status and functions of the wireless communication system 1, thereby allowing the wireless terminals 5 participating in the group to be set. The number of terminals can be dynamically spread and managed.

When all the wireless terminals 5 start transmission at the same time as in the terminal participation process, the total number of groups is set to a large value so that transmissions from the wireless terminals 5 are not concentrated in one communication slot in the initial stage of transmission. As the number of terminals accommodated per basic frame converges as time passes, the operation is performed by reducing the total number of groups, so that the slot can be operated efficiently without a gap.
In addition, when the communication path is congested, by setting the total number of groups large, the synchronization interval between each wireless terminal and the repeater 3 also increases in proportion to the total number of groups. The power saving can be achieved by reducing the reception opportunity of each terminal without reducing the efficiency.

Further, the following configuration can be obtained by using a subgroup number that is not numerically related to the group number assigned when the wireless terminal 5 is registered in the management server 2.
In the present embodiment, a maximum of 7 subgroups are grouped according to a 7-bit bit position.

Normally, in order to receive individual individual data addressed to itself, the wireless terminal 5 receives information sent in the order of a synchronization signal (synchronization frame), a terminal list (terminal ID frame), and individual data (data frame). When it is necessary to receive the signal and the subgroup is not used, if the synchronization signal indicates that the terminal list exists, all the wireless terminals 5 in the corresponding group need to receive the terminal list.
By performing the second grouping by the subgroup, the terminal list exists at the synchronization signal reception stage, but it can be seen whether individual data for the subgroup is included or not. Opportunities for receiving a useless terminal list that does not include data can be further reduced.

(2) Details of Embodiment FIG. 1 is a diagram illustrating an example of a network configuration of a wireless communication system 1 according to the present embodiment.
The wireless communication system 1 includes a management server 2,

relay devices

3a, 3b,..., A plurality of wireless terminals 5 that function as electronic shelf labels. As radio, RF (Radio Frequency), infrared rays, or the like can be used.

For example, when the wireless communication system 1 is installed in a large retail store, about 1 to 2 hours are used for rewriting the display content of the wireless terminal 5 in one day, and the display is not rewritten during other periods. The synchronization state of the terminal is maintained by the synchronization signal transmitted by the repeater at regular intervals.
Hereinafter, when there is no particular distinction between a repeater and a wireless terminal, they are simply referred to as a repeater 3 and a wireless terminal 5.

The management server 2 is a server that includes an application that communicates with the wireless terminal 5 and sets these display contents. For example, the management server 2 is installed in a store office.
The management server 2 communicates with the relay device 3 via a wired LAN (Local Area Network) or a wireless LAN, and communicates with the wireless terminal 5 via the relay device 3.

The repeater 3 is installed, for example, on the ceiling or pillar of a store, and performs communication with the management server 2 via a LAN, and also performs short-range wireless communication with a wireless terminal 5 existing in the vicinity, and the management server 2 and the wireless terminal Relay 5 communication.
As described above, the relay server 3 relays communication between the management server 2 and the wireless terminal 5 when the wireless terminal 5 performs short-distance wireless communication with the relay device 3. This is because the power consumption of the wireless terminal 5 can be reduced more than when communication is performed.

The repeater 3 performs dependent phase synchronization so that communication timings do not overlap.
That is, one parent repeater is set in the group of repeaters 3, a group of one repeater 3 forms a tree structure with the parent repeater as the apex, and the child repeater transmits the parent repeater. Dependent synchronization is performed by monitoring the synchronization signal.
For example, the

repeaters

3b and 3c (slave repeaters) receive a synchronization signal transmitted from the repeater 3a (parent repeater) to the wireless terminal 5, and transmit their own synchronization signals based on this reception timing.

The wireless terminal 5 is an electronic shelf label, and is installed on a store shelf or the like, and has an application for displaying the name and price of a product on a liquid crystal screen.
The wireless terminal 5 is associated with any one of the relay devices 3, and the wireless terminal 5 communicates with the relay device 3 associated with the wireless terminal 5.
For example, the repeater 3a is set so that the wireless terminal 5 in the wireless terminal group 6a communicates with the repeater 3a.

In these settings, when the wireless terminal 5 is installed on the product shelf, the wireless terminal 5 searches for the nearby relay 3 and transmits a terminal participation request to the relay 3 having the best radio wave condition. The relay device 3 reports this to the management server 2, and the management server 2 associates the wireless terminal 5 and the relay device 3 with each other. This association processing is sometimes called “terminal participation” or the like.

By the way, the management server 2 communicates with the wireless terminal 5 by arranging various information in a framework of a period called a basic frame and transmitting the information. Next, this mechanism will be described.
The wireless terminal 5 stores a unique number such as a hardware ID such as a manufacturing number or a serial number, for example, and the management server 2 manages communication by grouping the wireless terminals 5 using this. In FIG. 1, the numbers in the wireless terminal 5 represent the unique numbers of the wireless terminals.

Various methods of grouping can be considered. For example, the management server 2 determines the total number of groups, and divides (divides) the unique number of each wireless terminal 5 by the total number of groups to obtain a remainder, and the number of the remainder Is the group number of the wireless terminal 5.
For example, when the total number of groups is 3, since the wireless terminal 5 with the unique number 6 has a remainder of 0, it is classified into a group with the group number 0, and the wireless terminal 5 with the unique number 7 has a remainder of 1, so the group number It is divided into 1 group. Since the remainder of the wireless terminal with the unique number 2 is 2, it is classified into a group with the group number 2.
In the following, the group with group number i is abbreviated as group i and the like.

In this way, when the total number of groups is 3, as shown in FIG. 1, the wireless terminal 5 associated with the repeater 3a is divided into groups 0 to 2 and associated with the

repeaters

3b and 3c. Similarly, the wireless terminals 5 are also divided into groups 0 to 2. The numbers written on the wireless terminal 5 in FIG. 1 indicate unique numbers.
When the number of installed wireless terminals 5 is large, the same number of wireless terminals 5 belong to any group.

After setting the group in this way, the management server 2 generates a basic frame for each group, and transmits various information to the wireless terminal 5 using the basic frame.
For example, if the total number of groups is 3, and the basic frame of group i is represented as frame i, the management server 2 will be frame 2 → frame 1 → frame 0 → frame 2 → frame 1 → frame 0. Information in basic frames is transmitted in a predetermined order.

For example, since the radio terminals 5 belonging to the group 0 may synchronize with the frame 0 by skipping the frames 1 and 2 (skipping), the radio terminals 5 can be in a sleep state during that time to save power consumption.
The period length of the frame is fixed to a predetermined length (for example, 3 seconds), and the wireless terminal 5 synchronizes the frame period length with the total number of groups to obtain a basic frame for its own group. Synchronize and can pause in the case of basic frames addressed to other groups.

Furthermore, the management server 2 can change the total number of groups according to the situation.
When the total number of groups is increased, the suspension period of the wireless terminal 5 becomes longer, so that the power consumption of the wireless terminal 5 can be reduced, while the response such as the rewriting speed of the wireless terminal 5 decreases.
Conversely, when the total number of groups is reduced, the synchronization period of the wireless terminal 5 is shortened, so that the display of the wireless terminal 5 can be rewritten at high speed, but the power consumption of the wireless terminal 5 increases.
In this way, the wireless terminal 5 determines an appropriate total number of groups according to the situation, and manages communication based on this.

In addition to the usage method for adjusting the power consumption and the response speed, the total number of groups is used to distribute (spread) when a large number of wireless terminals 5 access the management server 2. It can also be used.
For example, when about 10,000 wireless terminals 5 are installed in a large store and registered with the management server 2 for participation, there is a possibility that access from a large number of wireless terminals 5 will be concentrated in a short time.
In such a case, the total number of groups is set to a large value such as 300, for example, and the access timing to the management server 2 is distributed, and the total number of groups is reduced as the number of unregistered wireless terminals 5 decreases. . With this configuration, it is possible to complete terminal participation in an optimum period while spreading the access from a large number of wireless terminals 5 while maintaining the maximum communication amount of terminal participation.

FIG. 2 is a diagram illustrating an example of a hardware configuration of the management server 2, the relay device 3, and the wireless terminal 5.
The management server 2 includes a CPU 21, a RAM 22, a storage medium 23, a clock 24, a display unit 25, an operation unit 26, a LAN connection I / F (interface) 27, and the like.
The CPU 21 is a central processing unit that executes a program stored in the storage medium 23 and controls various operations and each unit of the management server 2.
The RAM 22 is a random access memory that provides a working memory to the CPU 21.

The storage medium 23 is configured by, for example, a hard disk or a semiconductor device, and stores various programs and data. In the present embodiment, a program for grouping and communicating the wireless terminals 5, A terminal DB (database) or the like in which the wireless terminal 5 is registered is stored.
The clock 24 is composed of, for example, a crystal oscillator and generates a clock signal.

The display unit 25 is configured by a liquid crystal display, for example, and displays various screens such as an operation screen when the person in charge operates the management server 2.
The operation unit 26 includes an operation terminal such as a keyboard and a mouse, for example, and receives an operation of the management server 2 from a person in charge.
The LAN connection I / F 27 is a wired or wireless LAN, and communicates with the relay unit 3.

The repeater 3 includes a CPU 31, a RAM 32, a storage medium 33, a clock 34, a LAN connection I / F 35, a short-range wireless I / F 36, and the like.
The CPU 31 is a central processing unit that executes a program stored in the storage medium 33 or the like to exert a relay function or control each unit of the relay unit 3.
The RAM 32 is a random access memory that provides a working memory to the CPU 31, and temporarily stores information transmitted from the management server 2 when the information is transmitted to the wireless terminal 5.

The storage medium 33 is composed of, for example, a semiconductor device and stores various programs and data. In the present embodiment, the storage medium 33 is a program for relaying communication between the management server 2 and the wireless terminal 5, The relay machine ID, which is its own unique information, is stored.
The clock 34 is composed of, for example, a crystal oscillator and generates a clock signal.
The LAN connection I / F 35 is a wired or wireless LAN, and communicates with the management server 2.
The short-range wireless I / F 36 performs short-range wireless communication with the wireless terminal 5.

The wireless terminal 5 includes a CPU 51, a RAM 52, a storage medium 53, a clock 54, a display unit 55, a short-range wireless I / F 56, a battery 57, a terminal ID display unit 58, a participation switch 59, and the like.
The CPU 51 is a central processing unit that executes a program stored in the storage medium 53 or the like to exert an electronic shelf label function or control each unit of the wireless terminal 5.
The RAM 52 is a random access memory that provides a working memory to the CPU 51, and is transmitted from the repeater ID of the repeater 3 associated with itself or the repeater 3 when participating in the wireless communication system 1. Store synchronization signals and other data.

The storage medium 53 is configured by, for example, a semiconductor device and stores various programs and data. In the present embodiment, the storage medium 53 communicates with the management server 2 via the relay device 3 and is displayed on the display unit 55. A display program, a terminal ID which is self-unique information, a unique number used for grouping, and the like are stored. It is also possible to describe the terminal ID by a numerical value and use the terminal ID as a unique number.

The clock 54 is constituted by, for example, a crystal oscillator or the like, and is used to take timing and measure time for the wireless terminal 5 to perform various processes.
The display unit 55 is configured using, for example, a memory-type liquid crystal display device, and is configured to consume power when rewriting display contents and not consume power during a display period.

The short-range wireless I / F 56 performs short-range wireless communication with the repeater 3.
The battery 57 is composed of, for example, a so-called button battery and supplies power for driving the wireless terminal 5.
The terminal ID display unit 58 is a medium in which the terminal ID is printed with a barcode or the like, and is used when the terminal ID of the wireless terminal 5 is read by being attached to the surface of the wireless terminal 5.
The participation switch 59 is a button that is pressed when the wireless terminal 5 is installed on the product shelf and is allowed to participate in the management server 2.
Note that the participation switch 59 is not necessarily required, and various forms such as, for example, automatically performing a participation process when the wireless terminal 5 is powered on are possible.

FIG. 3 is a diagram illustrating an example of a logical configuration of the terminal DB stored in the management server 2.
The terminal DB includes items such as “relay machine ID”, “terminal ID”, and “unique number”.
“Repeater ID” is ID information of each repeater 3.
The “terminal ID” is ID information of each wireless terminal 5, and the “unique number” is a unique number of each wireless terminal 5.
These pieces of information are collected and registered from each wireless terminal 5 when the wireless terminal 5 is installed in the store and participates in the wireless communication system 1.
The group to which the wireless terminal 5 belongs is specified by dividing the unique number registered in the “unique number” by the total number of groups to obtain the remainder.

FIG. 4 is a diagram for explaining the configuration of a basic frame.
The basic frame has a fixed length of about 3 to 60 seconds. Within the period length, a synchronization period for transmitting a synchronization signal to the wireless terminal 5 and a data group composed of individual data of the wireless terminal 5 are transmitted. Data period to be transmitted, and when there is data to be transmitted from the wireless terminal 5 to the management server 2, a participation period for transmitting the data is provided in this order.

In the synchronization period, the synchronization signal for each repeater 3 is set in a time-sharing manner.
Synchronization data, terminal list information, group total number information, participation period information, and other information are set in the synchronization signal.
Further, although not shown, a group number may be set in the synchronization signal so that the wireless terminal 5 confirms the group number.

The synchronization data is information for the wireless terminal 5 to synchronize with the repeater 3. Since the clock of the wireless terminal 5 is shifted in time due to accuracy, the wireless terminal 5 corrects the synchronization timing using the synchronization data.
All the wireless terminals 5 of the wireless communication system 1 can maintain a synchronization state under the management of each relay device by the synchronization data transmitted by each relay device.

The terminal list information is a transmission timing of the terminal list existing at the head of the data period, and functions as a terminal list pointer.
The terminal list information is not set when the terminal list does not exist in the basic frame (that is, when individual data does not exist).
Therefore, the wireless terminal 5 can determine the presence / absence of individual data addressed to the wireless terminal 5 of its own group in the basic frame based on the presence / absence of the terminal list information, and functions as the presence / absence information of the individual data.
The reason why the terminal list is received after determining the presence / absence of the terminal list based on the terminal list information is to reduce the reception opportunity of the terminal list as much as possible.
Since the amount of information in the terminal list is larger than the amount of information in the terminal list information, the power consumption of the wireless terminal 5 can be reduced by making it possible to determine in advance whether or not there is a terminal list using a synchronization signal.
The group total number information is the total number of groups used in the next basic frame for the group.
The participation period information is the start timing of the participation period, and the terminal can transmit a participation request from this period to the start of the next synchronization period.

In the data period, a terminal list and individual data are set.
The terminal list is a list of terminal IDs and reception timings (transmission start timing of individual data) of the wireless terminals 5 that receive the individual data.

The individual data is, for example, the wireless terminal 5 specified in the terminal list, such as data for rewriting the display by the wireless terminal 5, a command to the wireless terminal 5, and an update program for updating a program installed in the wireless terminal 5. Data and programs addressed to.
If the individual data is larger than the data amount that can be transmitted at one time, the data is divided and transmitted.
The wireless terminal 5 transmits an ACK (acknowledgment confirmation frame) for each frame to the management server 2 via the relay device 3, and the management server 2 uses this for retransmission processing. The wireless terminal 5 displays a screen when all the data is available.

The participation period is a period during which data to be transmitted from the wireless terminal 5 to the management server 2 is transmitted.
For example, when the wireless terminal 5 is installed and registered in the management server 2, for example, a sensor such as a thermometer is installed in the wireless terminal 5 and a measured value is transmitted to the management server 2.
For example, the registration is as follows.
The wireless terminal 5 first checks the presence of the repeater 3 by first searching for a synchronization signal over the air.
When the presence of the relay device 3 is confirmed, a participation request including its own terminal ID is transmitted to the management server 2 via the relay device 3 using the participation period defined in the synchronization signal. The wireless terminal 5 can transmit this participation request autonomously, but otherwise follows the scheduling of the management server 2.

The wireless terminal 5 operates as follows using the basic frame configured as described above.
When the wireless terminal 5 receives the synchronization data, it synchronizes with the repeater 3 using the synchronization data and tries to receive the terminal list information.
If the terminal list information has not been transmitted, since the basic frame has no individual data addressed to itself, the wireless terminal 5 is suspended until the next synchronization signal, while the terminal list information has been transmitted. In this case, the terminal list is received at the timing specified by the terminal list information.

Then, the wireless terminal 5 refers to the terminal list in the data period to check whether or not its own terminal ID exists, and if it exists, receives the individual data at the timing specified in the terminal list. If the terminal ID of the wireless terminal 5 does not exist, the wireless terminal 5 enters a dormant state.

Further, the wireless terminal 5 receives the group total number information, stores it in the RAM 52, and a self-group number in the next basic frame by a remainder obtained by dividing its own unique number by the total number of groups specified by the group total number information. And the next synchronization timing is calculated.

For example, it is assumed that the total number of groups changes from 1 to 5 from the next time. However, the period length of the basic frame is a fixed value of 3 seconds.
At this time, when the group number of the wireless terminal 5 from the next time is j, the wireless terminal 5 receives the synchronization signal next 3 seconds × j seconds. For example, when the own group number is changed from 0 to 3, the first reception after the change of the group number is 3 seconds × 3 = 9 seconds, and when the total number of groups is not changed thereafter, 5 groups × 3 seconds. = A sync signal is received every 15 seconds.

In general, when the total number of groups changes from n to m, and the own group number changes from i to j, the wireless terminal 5 receives the next synchronization signal after 3 × (n−i + j) seconds, and thereafter As long as the total number of groups does not change, a synchronization signal is received every m × 3 seconds.

FIG. 5A is a diagram for explaining an example of transmission of individual data using a basic frame.
In order to omit the display space, in the figure, the terminal list is written as a list, and the individual data is written as data.
As shown in the figure, in the synchronization period, the synchronization signal for each of the

repeaters

3a, 3b, and 3c is transmitted by time division.
The wireless terminal 5 determines the presence / absence of the terminal list information of the synchronization signal. If the terminal list information exists, the wireless terminal 5 receives the terminal list at a timing specified by the terminal list information, and receives the terminal ID in the terminal list. Is specified, the individual data is received at the timing specified in the terminal list.

The example of FIG.5 (b) is a figure for demonstrating the other transmission example of the separate data by a basic frame.
In this example, the transmission timing of the terminal list is made variable by designating the transmission timing of the terminal list in the terminal list information, and further, the data period is time-divided corresponding to the relay device 3 so that the plurality of relay devices 3 Individual data can be transmitted in one basic frame to the associated wireless terminal 5.

For example, the wireless terminal 5 associated with the relay device 3a checks the presence / absence of individual data with the terminal list information of the synchronization signal for the relay device 3a, and receives the terminal list at the timing specified by the terminal list information. To do.
When the terminal ID is present in the terminal list, the individual data is received at the timing specified in the terminal list.

The wireless terminal 5 associated with the repeater 3b receives the synchronization signal for the repeater 3b, confirms the presence / absence of the terminal list information in the same manner as described above, and if the terminal list information exists, the terminal list The terminal list is received at the timing specified by the information, and further individual data is received.
The period for transmitting the terminal list and individual data for the relay device 3a and the period for transmitting the terminal list and individual data for the relay device 3b do not overlap with each other in the data period.

In this way, the management server 2 performs scheduling so that the terminal list / individual data transmission period for the relay 3a and the terminal list / individual data transmission period for the relay 3b do not overlap. Individual data can be transmitted to the wireless terminal 5 associated with 3 in one basic frame.

Similarly, FIG. 6 is an example in which individual data is transmitted to the wireless terminal 5 associated with a plurality of repeaters 3 in one basic frame.
In this example, individual data is transmitted in one basic frame to the repeater 3b and the wireless terminal 5 associated with the repeater 3c.

FIG. 7A is a diagram for explaining mode switching based on the total number of groups.
The rectangle in the figure represents one basic frame, and the parentheses represent the total number of groups and the group number. When the basic frame length of the basic frame is 3 seconds and the number of seconds required to transmit information to all groups is n seconds, this is called an n-second mode.

In the 15-second mode, the total number of groups is n = 5, and the management server 2 transmits information in the order of frame 4 → frame 3 → frame 2 → frame 1 → frame 0 →.
In the 3-second mode, the total number of groups n = 1, and all wireless terminals 5 belong to group 0. Then, the management server 2 transmits information based on frame 0 every time, such as frame 0 → frame 0 →.
In the 1-minute mode, the total number of groups n = 20, and the management server 2 transmits information in the order of frame 19 → frame 18 →... → frame 0 → frame 19 →.
The general mode format is as shown in the figure.

FIG. 7B is a diagram for explaining the synchronization interval between the 15-second mode and the 3-second mode.
In the 15-second mode, the wireless terminals 5 in the group 4 can receive information in basic frames every 15 seconds and can pause in the basic frames for groups 3 to 0.
Similarly, the wireless terminals 5 in the group 3 may be synchronized with the basic frame for the group 3 that goes around every 15 seconds.
On the other hand, in the 3 second mode, all the wireless terminals 5 synchronize with the basic frame every 3 seconds.
The response of the wireless terminal 5 is most accelerated in the 3-second mode. For example, the management server 2 uses this as the high-speed mode. For example, the 30-second mode (total number of groups n = 10) is set as the normal mode. When used, the wireless terminal 5 can be favorably controlled.

The case where a group is set in the wireless terminal 5 has been described above. However, if the sub-group is further set in the wireless terminal 5, more detailed power consumption can be reduced.
Here, digital information of several bits is used as the subgroup information. For example, when the subgroup is 7 groups, the 7-bit information is used, and the subgroup is set depending on which bit is set to 1.
For example, when subgroup 1 is set, 1 is set to the first bit such as (0000001), and when subgroup 2 is set, 1 is set to the second bit such as (0000010). To do.

The wireless terminal 5 has a subgroup set by associating it with the position of the bit string. For example, the wireless terminal 5 associated with the fifth bit has subgroup information (0010000) sent from the management server. If the fifth bit is 1, it is recognized that its own subgroup is designated.
Further, for example, when the subgroup information sent from the management server is (1001001), 1 is set in the 1st bit, 4th bit, and 7th bit, and it is associated with 1st, 4th, 7th bit. It is recognized that the wireless terminals 5 of the

subgroups

1, 4, and 7 are designated.

In addition to the group number of the wireless terminal 5, the management server 2 stores each subgroup number (positions 1 to 7 where bits are set) in the terminal DB.
The subgroup number may be stored in advance in the storage medium 53 of FIG. 2 separately from the terminal ID and unique number, and the wireless terminal 5 notifies the management server 2 of this when participating. Alternatively, the management server 2 may set the subgroup number of the wireless terminal 5 and notify the wireless terminal 5 so that the wireless terminal 5 stores the information. You may comprise so that the remainder value which divided simple ID (short address) linked | related one-to-one with a number (8 digits) by the number of subgroups (7) may be utilized.

FIG. 8 is a diagram for explaining an example of setting a subgroup.
The numbers in the wireless terminal 5 in the figure are unique numbers, the subgroup numbers (recognized bit positions) in parentheses below the numbers, and the group numbers in the wireless terminal group 6 are shown.
Thereby, for example, the wireless terminals 5 can be further divided into groups, such as the wireless terminal 5 having a group number of 1 and a subgroup number of 7.
This is an example, and subgroups may be set by other methods.

FIG. 9 is a diagram in which the mode switching by the total number of groups in FIG. 7 is associated with subgroups.
In the parentheses in the basic frame, the upper part indicates the total number of groups and the group number, and the lower part indicates the subgroup number. However, the subgroup number is indicated by 7-bit information (10... 10) (partially omitted).
As in FIG. 7, various modes such as a 15-second mode and a 3-second mode are possible.
When the subgroup number is used in this way, a bit for the subgroup number is provided in the synchronization signal shown in FIG. 4 to set the subgroup number.

On the other hand, the wireless terminal 5 confirms whether or not its own subgroup number is designated by the bit for the subgroup number, and confirms the terminal list when its own subgroup number is designated. However, when its own subgroup number is not designated, it enters a dormant state.
Thereby, it is possible to reduce the possibility that the wireless terminal 5 receives the terminal list and becomes idle, and the power consumption of the wireless terminal 5 can be further reduced.

Hereinafter, operation | movement of the radio | wireless communications system 1 is demonstrated using various flowcharts. Here, it is assumed that the wireless terminals 5 are grouped by a group number and a subgroup number.
FIG. 10 is a flowchart for explaining the operation when the management server 2 receives a data transmission request.
The following processing is performed by the CPU 21 (FIG. 2) according to a predetermined program.
The management server 2 accepts a data transmission request by the operation of the person in charge from the operation unit 26 or the like (step 5).

Then, the management server 2 creates a transmission queue (queue) using data input from the person in charge, and registers it by storing it in the storage medium 23 (step 10).
The transmission waiting queue is a collection of data to be transmitted to the wireless terminal 5 for each group number of the wireless terminal 5.

FIG. 11 is a flowchart for explaining a procedure in which the management server 2 generates and transmits information in the basic frame.
The management server 2 generates synchronization data for group n (step 15).
Next, the management server 2 reads the transmission queue of group n from the storage medium 23 (step 20).
Then, the management server 2 creates a terminal list and individual data using the read data (step 25).

Next, the management server 2 confirms the subgroup number of the wireless terminal 5 that receives the individual data with the terminal DB, and sets the bit for the subgroup number to be received in the synchronization signal (step 30).
Next, the management server 2 checks whether or not there is a vacancy in the basic frame (step 35). If there is no vacancy (step 35; N), the management server 2 transmits the information (step 40).
On the other hand, if there is a vacancy (step 35; Y), the management server 2 checks whether there is a transmission queue in the next group n + m or nm (m = 1, 2, 3,...). If there is (Step 45; Y), the information to be transmitted is added back to Step 15, and if not (Step 45; N), the generated information is transmitted according to the basic frame (Step 45). 40).

FIG. 12 is a flowchart for explaining the reception operation of the wireless terminal 5.
First, the wireless terminal 5 performs initialization by deleting previously received data (step 50).
Next, the wireless terminal 5 receives the synchronization signal (step 55), synchronizes with the repeater 3 using the synchronization data, and confirms the presence / absence of terminal list information (step 60).

When the terminal list information does not exist (step 60; N), the wireless terminal 5 enters a dormant state and is activated when information on the next basic frame is transmitted and returns to step 50.
On the other hand, when the terminal list information exists (step 60; Y), the wireless terminal 5 confirms the bit for the subgroup number, and confirms whether or not its own subgroup number is designated by the bit (step 70). ).

If it does not correspond to the subgroup number set by the bit (step 70; N), the wireless terminal 5 enters a dormant state and is activated when information on the next basic frame is transmitted and returns to step 50.
On the other hand, when it corresponds to the subgroup number set by the bit (step 70; Y), the wireless terminal 5 receives the terminal list (step 75).

Next, the wireless terminal 5 determines whether there is individual data addressed to itself by confirming whether or not its own terminal ID is included in the terminal list (step 80).
When there is no individual data addressed to itself (step 80; N), the wireless terminal 5 enters a dormant state, is activated when information is transmitted in the next basic frame, and returns to step 50.
On the other hand, when there is individual data addressed to itself (step 80; Y), the wireless terminal 5 receives the individual data (step 85) and displays the price (step 90).

In this way, the wireless terminal 5 checks whether or not individual data addressed to itself exists in the basic frame in the order of the presence / absence of terminal list information, its own subgroup number, and terminal list. When it is confirmed, it enters a sleep state, and the power consumption can be reduced.

FIG. 13 is a flowchart for explaining a procedure for the wireless terminal 5 to calculate the synchronization interval based on the total number of groups transmitted from the management server 2.
First, the wireless terminal 5 receives the total number of groups included in the synchronization signal (step 100). This total number of groups is the total number of groups used in the next information transmission.
Next, the wireless terminal 5 calculates its own group number by dividing its own unique number by the total number of groups to obtain a remainder (step 105).

Then, the wireless terminal 5 calculates the synchronization timing of the next basic frame addressed to its own group (step 110).
In addition, when the total number of groups is the same as the total number of groups currently used, it can also be configured to use the current synchronization interval without calculating.

Next, an example of a method for adjusting the total number of groups when the wireless terminal 5 is installed in a store and the participation process for registration in the management server 2 is performed will be described.
The management server 2 stores a list of participating wireless terminals 5, and calculates the number of wireless terminals 5 that have not participated (hereinafter, the number of unparticipated terminals) by comparing the participating wireless terminals 5 with the list. be able to.
The management server 2 monitors the number of non-participating terminals while performing the participation process of the wireless terminal 5.

The management server 2 classifies the number of non-participating terminals by threshold values N1 and N2 (N1> N2). When the number of non-participating terminals is N1 or more, the total number of groups is M1, and the number of non-participating terminals is N2. If the number is less than N1, the total number of groups is M2 (M2 <M1).
If the number of non-participating terminals is less than N2, the management server 2 sets the total number of groups to M3 (M3 <M2) used in the normal mode.
As described above, the management server 2 initially sets the total number of groups to be large, spreads the access of the wireless terminals 5, and reduces the total number of groups as the number of non-participating terminals decreases.

FIG. 14 is a flowchart for explaining a change in the total number of groups accompanying the participation of the wireless terminal 5.
It is determined whether or not the number of non-participating terminals is N1 or more (step 130). If the number of non-participating terminals is N1 or more (step 130; Y), the management server 2 sets the total number of groups to M1. (Step 135) While the number of non-participating terminals is N1 or more, Step 130 and Step 135 are repeated.
On the other hand, when the number of non-participating wireless terminals 5 decreases and becomes less than N1 (step 130; N), the management server 2 determines whether the number of non-participating terminals is N2 or more (step 140).

When the number of non-participating terminals is N2 or more (step 140; Y), the management server 2 sets the total number of groups to M2 (step 145), and while the number of non-participating terminals is N2 or more, step 140 and step Repeat 145.
On the other hand, when the number of non-participating wireless terminals 5 decreases and becomes less than N2 (step 140; N), the management server 2 sets the total number of groups to M3 (step 150).
Thereby, when there are many non-participating terminals, the wireless terminal 5 reduces the reception operation frequency to reduce power consumption. On the other hand, if the terminal participation progresses and the number of non-participating terminals decreases, the wireless terminal 5 frequently performs the reception operation. By performing quick terminal participation, it is possible to reduce the time required for terminal participation in the entire system.

In the above, the total number of groups (grouping number) is set by the management server 2 and the unique number of the wireless terminal 5 is divided by this to set the group number. For example, when the total number of groups is 5, the wireless terminal 5 It is also possible to set a group number using a random number, such as generating a random number from 0 to 4 and setting a group number.
In this case, the wireless terminal 5 notifies the management server 2 of its own group number.

Also, it is possible to configure a dummy group that does not include the wireless terminal 5 and thereby generate a dummy basic frame to adjust the synchronization interval of the wireless terminal 5.

Further, the wireless communication system 1 can be used as an electronic shelf label system for a store such as a supermarket, and can also be used for inventory management in a warehouse and instructions to workers on a production line.
When installed in a supermarket, connected to a higher-level POS (Point of Sales) system to receive product information and price information and transmit the contents to the wireless terminal 5 associated with the product You can also

In the present embodiment described above, the management server 2 transmits information using the basic frame to the wireless terminals 5 that are synchronized at intervals corresponding to the number of groups (total number of groups) of the wireless terminals 5. Is functioning as
As shown in FIG. 15, the management server 2 divides the unique number of the wireless terminal 5 by the total number of groups by selecting the mode according to the situation, etc. A grouping unit 210 is provided for grouping the wireless terminals into the determined number of groups, for example, by obtaining a remainder.
Then, the management server 2 wirelessly transmits a group number notifying unit 209 that notifies the wireless terminal 5 of the number of groups based on the group total number information, and a data input unit that inputs data from a repeater, a keyboard, a higher-level POS, and the like. Data acquisition means 202 for acquiring data to be transmitted to the terminal 5 (individual data), data relating to grouping of the wireless terminals 5 and the like, and generating a basic frame for each group of the wireless terminals 5 with a fixed period length In accordance with a predetermined order based on the group divided group, for example, a frame according to a basic frame generation unit 211 that sets the data to a data period provided in a basic frame of a group to which the wireless terminal 5 to which the data is transmitted belongs. 4 → Frame 3 →... And other information for transmitting information based on the generated basic frame And a signal means 212.

When the management server 2 notifies the wireless terminal 5 of the total number of groups, the wireless terminal 5 can acquire its own group number by dividing the unique number by the total number of groups. 5 is provided with group notification means for notifying the group to which the wireless terminal 5 belongs.
That is, in the present embodiment, when the number of groups is notified to the wireless terminal 5, the wireless terminal 5 can thereby identify the group to which the wireless terminal 5 belongs, so that the group number determination means 208 also functions as a group notification means. .
The basic frame generation unit 211 of the management server 2 transmits data presence / absence information (terminal list information) indicating that data to be transmitted to the wireless terminal 5 exists in the basic frame before transmitting data (individual data). The basic frame is configured as follows.

Further, the management server 2 includes a terminal list acquisition unit 201 that acquires a terminal list that is a list of wireless terminals 5 that receive data (individual data). The basic frame is configured to be transmitted after the presence / absence information (terminal list information) and before the data (individual data).

Further, the management server 2 includes subgroup specifying means 204 for specifying subgroups formed in the group of the wireless terminals 5 using the terminal DB 205 or the like, and the basic frame generating means 211 includes the wireless terminals 5 included in the terminal list. The basic frame is transmitted so that the subgroup specifying information (bit information specifying the subgroup) specifying the subgroup to which the device belongs is transmitted after the presence / absence information (terminal list information) and before the terminal list. Constitute.

The management server 2 includes a registration unit 206 that receives a terminal registration request (participation request) from the wireless terminal 2 and registers the wireless terminal 5 in the terminal DB as a data (individual data) transmission destination, and determines the number of groups. The means 208 changes the number of groups according to the number of wireless terminals that make a terminal registration request, such as increasing the total number of groups when there are many non-participating wireless terminals 5.

The wireless terminal 5 functions as a wireless terminal that receives information based on the basic frame generated for each group from the management server 2.
Then, as shown in FIG. 16, the wireless terminal 5 divides the unique number by the total number of groups, for example, a group number receiving unit 502 that receives the number of groups from the information processing apparatus (management server 2) according to the total number of groups information. The group specifying means 503 for specifying the group to which the user belongs by obtaining the remainder and the synchronization interval acquiring means 510 for acquiring the synchronization interval by calculating the synchronization interval using the number of groups and the specified group (self group number). In accordance with the synchronization interval, the information receiving means 501 that receives the information transmitted by the management server 2 in synchronization with the basic frame of the management server 2, and at least a group other than its own group in the period of the synchronization interval And a pause means 512 that pauses while the information generated by the basic frame is being transmitted.

In addition, since the wireless terminal 5 calculates the group number by dividing the unique number by the total number of groups, the group specifying unit 503 specifies the group using the received number of groups.
The wireless terminal 5 includes presence / absence information receiving means 505 for receiving presence / absence information (terminal list information) indicating that data (individual data) addressed to its own group is present in the basic frame. When it is determined that there is no data, the sleep unit 512 enters a sleep state.

Further, the wireless terminal 5 has subgroup storage means 511 for storing the subgroup to which the wireless terminal 5 belongs in the RAM 52 or the like, and subgroup specifying information (bit information specifying the subgroup) transmitted after the presence / absence information (terminal list information). ) Is received, and when the stored subgroup is different from the subgroup specified by the received subgroup specifying information, the sleep function 512 sets the wireless function to the sleep state.

The wireless terminal 5 includes terminal list receiving means 508 for receiving a terminal list that is a list of wireless terminals to which data is transmitted, which is transmitted after the subgroup specifying information, and does not exist in the terminal list. In this case, the sleep unit 512 is put into a sleep state.

Further, the management server 2 (FIG. 15) includes a communication mode management (number of groups, total number of groups) means 207 for managing the total number of groups, a transmission data storage means 203 for each group number for storing individual data for each group number, and a relay The communication function means 213 for communicating with the machine 3 and the LAN driver 214 are provided.
Then, as shown in FIG. 17, the relay device 3 performs transmission scheduling means 301 for scheduling information transmitted from the management server 2 to transmit to the wireless terminal 5, and data for transmitting data to the wireless terminal 5. A transmission unit 304, a data reception unit 303 that receives data from the wireless terminal 5, and a LAN driver 302 for communicating with the management server 2 are provided.
Further, the wireless terminal 5 (FIG. 16) includes a group number management unit 504 that manages its own group number, a sub group number management unit 507 that manages its own sub group number, and data that transmits data to the repeater 3 Transmission means 509 is provided.

According to the embodiment described above, the following effects can be obtained.
(1) The management server 2 can set a logical group of wireless terminals 5 across a plurality of relays 3.
(2) By creating a basic frame for each group, the wireless terminal 5 can synchronize with the basic frame to which the wireless terminal 5 belongs, and can reduce power consumption by pausing the period of the basic frame of another group.
(3) The management server 2 further suppresses useless access to the terminal list of the wireless terminal 5 by subdividing the wireless terminal 5 into subgroups depending on the group, thereby reducing the power consumption of the wireless terminal 5. Further reduction can be achieved.
(4) The management server 2 can set the total number of groups according to the situation by dynamically grouping the wireless terminals 5 by changing the total number of groups.
(5) When the management server 2 and tens of thousands of wireless terminals 5 perform one-to-one transmission, the total traffic amount of the communication path is optimized by selecting the group number and subgroup number that the wireless terminal 5 can participate in. Thus, it is possible to reduce the reception opportunities of the wireless terminal 5 and to save power.
(6) When access from the wireless terminal 5 to the management server 2 is concentrated, such as participation processing, the total number of groups can be increased and distributed.
(7) The reception opportunities of the wireless terminal 5 can be reduced as much as possible to ensure a long battery life.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 2 Management server 3 Relay machine 5 Wireless terminal 6 Wireless terminal group 21 CPU
22 RAM
23 Storage medium 24 Clock 25 Display unit 26 Operation unit 27 LAN connection I / F
31 CPU
32 RAM
33 Storage medium 34 Clock 35 LAN connection I / F
36 Short-range wireless I / F
51 CPU
52 RAM
53 Storage Medium 54 Clock 55 Display Unit 56 Short-range Wireless I / F
57 Battery 58 Terminal ID display 59 Participating switch

Claims

An information processing apparatus that transmits information using a basic frame to the wireless terminal that is synchronized at intervals according to the number of groups of wireless terminals,
A group number determining means for determining the number of groups;
Grouping means for grouping wireless terminals into the determined number of groups;
Group number notifying means for notifying the wireless terminal of the determined number of groups;
Data acquisition means for acquiring data to be transmitted to the wireless terminal;
A basic frame generating means for generating a basic frame for each group of the wireless terminals having a fixed period length, and setting the acquired data as a basic frame of a group to which the wireless terminal to which the data is transmitted belongs;
Information transmitting means for transmitting information by the generated basic frame according to a predetermined order based on the grouped group;
An information processing apparatus comprising:
The information processing apparatus according to claim 1, further comprising group notification means for notifying the wireless terminal of a group to which the wireless terminal belongs.
The basic frame generation means configures the basic frame to transmit presence / absence information indicating that data to be transmitted to the wireless terminal exists in the generated basic frame before transmitting the acquired data. The information processing apparatus according to claim 1, wherein the information processing apparatus is characterized.
Comprising a terminal list acquisition means for acquiring a terminal list that is a list of wireless terminals that receive the acquired data;
The basic frame generation unit configures the basic frame so that the acquired terminal list is transmitted after the presence / absence information and before the acquired data. 3. The information processing apparatus according to 3.
Comprising subgroup specifying means for specifying a subgroup formed in the group of wireless terminals,
The basic frame generation means transmits subgroup specifying information for specifying a subgroup to which a wireless terminal included in the terminal list belongs, after the presence / absence information and before the acquired terminal list The information processing apparatus according to claim 4, wherein the basic frame is configured as described above.
A registration unit that receives a terminal registration request from a wireless terminal and registers the wireless terminal as a data transmission destination;
The said group number determination means changes the number of groups according to the number of the radio | wireless terminals which perform the said terminal registration request, The claim in any one of Claim 1 to 5 characterized by the above-mentioned. Information processing device.
A wireless terminal that receives information based on a basic frame generated for each group from the information processing apparatus according to claim 1,
Group number receiving means for receiving the number of groups from the information processing apparatus;
A group identification means for identifying a group to which the user belongs;
Synchronization interval acquisition means for acquiring a synchronization interval using the received group number and the specified group;
Information receiving means for receiving information transmitted by the information processing device according to the acquired synchronization interval;
During the period of the acquired synchronization interval, a pause unit that pauses at least during transmission of information based on a basic frame generated for a group other than the specified group;
A wireless terminal comprising:
The wireless terminal according to claim 7, wherein the group specifying means specifies the group using the received number of groups.
Comprising presence / absence information receiving means for receiving presence / absence information indicating that data addressed to the own group is present in the basic frame;
9. The wireless terminal according to claim 7, wherein when the data is determined not to exist based on the received presence / absence information, the wireless terminal enters a sleep state by the suspension unit.
Subgroup storage means for storing the subgroup to which the device belongs;
Subgroup specifying information receiving means for receiving subgroup specifying information transmitted after the presence information;
Comprising
The radio terminal according to claim 9, wherein when the stored subgroup is different from the subgroup specified by the received subgroup specifying information, the radio terminal is in a dormant state by the dormancy unit.
Terminal list receiving means for receiving a terminal list, which is a list of wireless terminals to which data is transmitted, transmitted after the subgroup specifying information;
The wireless terminal according to claim 10, wherein when the terminal does not exist in the received terminal list, the wireless terminal enters a sleep state by the suspension unit.
An information processing apparatus that transmits information using a basic frame to the wireless terminal that is synchronized at intervals according to the number of groups of wireless terminals,
A group number determination function for determining the number of groups;
A grouping function for grouping wireless terminals into the determined number of groups;
A group number notification function for notifying the wireless terminal of the determined number of groups;
A data acquisition function for acquiring data to be transmitted to the wireless terminal;
A basic frame generation function for generating a basic frame for each group of the wireless terminals having a fixed period length, and setting the acquired data as a basic frame of a group to which the wireless terminal to which the data is transmitted belongs;
An information transmission function for transmitting information based on the generated basic frame according to a predetermined order based on the grouped group;
Information processing program that realizes the above on a computer.
A wireless terminal program for realizing a function of receiving information by a basic frame generated for each group from the information processing apparatus according to claim 1 by a computer,
A group number receiving function for receiving the number of groups from the information processing apparatus;
A group identification function for identifying the group to which the user belongs;
A synchronization interval acquisition function for acquiring a synchronization interval using the received group number and the identified group;
An information receiving function for receiving the information transmitted by the information processing device according to the acquired synchronization interval;
A pause function that pauses during the period of the acquired synchronization interval while at least information based on a basic frame generated for a group other than the specified group is being transmitted;
A wireless terminal program that implements a computer.