WO2017122324A1

WO2017122324A1 - Wireless communication system, termination device, node device, wireless communication method and wireless communication program

Info

Publication number: WO2017122324A1
Application number: PCT/JP2016/050982
Authority: WO
Inventors: 陽輔西潟
Original assignee: 三菱電機株式会社
Priority date: 2016-01-14
Filing date: 2016-01-14
Publication date: 2017-07-20

Abstract

A node device is provided with: a transmission unit (13) that transmits, to a termination device, a setting request requesting setting of a transmission time zone in which a message is transmitted; a determination unit (17) that, when receiving a setting response including a response time zone, determines whether or not the setting response is a response to the setting request transmitted from the device itself, wherein the determination unit (17), if the setting response is a response to the setting request transmitted from the device itself, stores the response time zone as the transmission time zone in a storage unit (16), and, if the setting response is not a response to the setting request transmitted from the device itself, stores the response time zone as the transmission time zone in the storage unit (16) and determines a time zone in which the message is received as a node reception time zone; and a generation unit (25) that rewrites the response time zone included in the setting response to the node reception time zone and transmits the setting response in which the response time zone has been rewritten.

Description

Wireless communication system, termination device, node device, wireless communication method, and wireless communication program

The present invention relates to a wireless communication system, a terminal device, a node device, a wireless communication method, and a wireless communication program that constitute a wireless multi-hop network system.

A wireless multi-hop network system includes a terminal, a terminal terminal, a host device of the terminal terminal, and the like, and generally has a network configuration in which terminals are accommodated in a tree shape under the terminal terminal. A terminal is also called a node or a node device. Hereinafter, the terminal will be described as a node device. The terminal terminal is also called a terminal device. Hereinafter, the terminal terminal will be described as a terminal device.
The terminal device or a host device of the terminal device can collect data from each node device by hopping a plurality of node devices. For example, each node device transmits the measured data to the upper node device, and transmits data received from the lower node device to the upper node device, thereby transmitting the data to the termination device. By such a procedure, the terminating device or the host device collects data measured by each node device. A communication method such as specific low-power radio, IEEE 802.15.4 standard, IEEE 802.15.4e standard is applied to communication between the node device and the node device, or communication between the node device and the terminal device. .

In a wireless multi-hop network system, a TSCH (Time Slotted Channel Hopping) method defined by the IEEE 802.15.4e standard may be applied. That is, this is a case where a MAC (Media Access Control) method using both TDMA (Time Division Multiple Access) and CSMA-CA (Carrier Sense Multiple Access-Collision Avidence) is applied.
Among the TSCH schemes, the node device and the termination device need to negotiate in advance the time frame for transmitting the data frame between the transmission side and the reception side in the time zone operating in TDMA.

In the technology disclosed in Non-Patent Document 1, the timing of data frames transmitted by terminals is fixed, and no arbitration is performed between terminals. In a wireless multi-hop system that repeats a plurality of transfers (hops) from a node device to a terminal device, a node device that is a child of the wireless multi-hop system transmits information to be transmitted to the terminal device to the node device of its own system. At this time, information to be transmitted to the terminal device is continuously held in the node device until the next timing at which the node device can be transferred. That is, there is a problem that the holding time in the node device of the own system may be increased. When the number of node devices in the own system increases, the number of data frames held by the node device in the own system increases.In other words, data frames are retained, and data frames to be transferred are discarded due to queue overflow or the like. There is a possibility of being forced. As a result, there arises a problem that the data collection rate in the wireless multi-hop system decreases.

In the present invention, when each node device transmits a data frame to a terminal device, the data frame stays in the node device by arbitrating between the reception timing and transmission timing of each node device and the reception timing of the terminal device. The purpose is to prevent this.

A wireless communication system according to the present invention includes:
In a wireless communication system comprising a termination device and a node device that transmits a message to the termination device by wireless communication,
The node device is
Sending a setting request for requesting setting of a transmission time zone for transmitting the message to the terminating device,
The terminator is
When the setting request is received, a terminal reception time zone for receiving the message from the node device is determined, and a setting response including the terminal reception time zone as a response time zone is transmitted to the node device,
The node device is
When the setting response is received, the response time zone included in the setting response is stored in the storage unit as the transmission time zone.

According to the wireless communication device of the present invention, the node device transmits a setting request for requesting setting of a transmission time zone for transmitting a message to the terminating device. When receiving the setting request, the termination device determines a termination reception time zone for receiving a message from the node device, and transmits a setting response including the termination reception time zone as a response time zone to the node device. When receiving the setting response, the node device stores the response time zone included in the setting response as a transmission time zone in the storage unit. Therefore, it is possible to achieve arbitration between the termination reception time zone that is the reception timing of the termination device and the transmission time zone that is the transmission timing of each node device, and it is possible to prevent messages from staying in the node device.

1 is a configuration diagram of a wireless communication system 500 according to Embodiment 1. FIG. 1 is a configuration diagram of a node device 10 according to Embodiment 1. FIG. 1 is a configuration diagram of a termination device 20 according to Embodiment 1. FIG. 4 is a configuration example of a setting request 40 according to the first embodiment. 4 shows a configuration example of a setting response 50 according to the first embodiment. FIG. 6 is a diagram showing a wireless communication process S100 of a wireless communication method 510 and a wireless communication program 520 in the wireless communication system 500 according to the first embodiment. FIG. 5 is a flowchart of termination time zone determination processing S31 by the termination device 20 according to the first embodiment. FIG. 6 is a flowchart of node time zone determination processing S33 according to the first embodiment. The flowchart of relay node time slot | zone setting process S34 which concerns on Embodiment 1. FIG. The time zone chart 261 which the termination | terminus apparatus 20 which concerns on Embodiment 1 has memorize | stored in the memory | storage part 26. FIG. The time zone chart 161a which the node apparatus 10 (10a_adr) which concerns on Embodiment 1 has memorize | stored in the memory | storage part 16. FIG. The time zone chart 261 which the termination | terminus apparatus 20 which concerns on Embodiment 1 has memorize | stored in the memory | storage part 26. FIG. The time zone chart 161a which the node apparatus 10 (10a_adr) which concerns on Embodiment 1 has memorize | stored in the memory | storage part 16. FIG. The time zone chart 161b which the node apparatus 10 (10a_adr) which concerns on Embodiment 1 has memorize | stored in the memory | storage part 16. FIG. FIG. 3 is a configuration diagram of a node device 10 according to a modification of the first embodiment. The block diagram of the termination | terminus apparatus 20 which concerns on the modification of Embodiment 1. FIG. The flowchart of termination | terminus time zone determination processing S31a of the termination | terminus apparatus 20 which concerns on Embodiment 2. FIG. The figure which shows the time slot | zone of each apparatus determined by the series of processes shown in FIG. 6 of Embodiment 1. FIG. The figure which shows the time slot | zone of each apparatus at the time of replacing the termination time slot | zone determination process S31a of Embodiment 2 with the termination | terminus time slot | zone determination process S31 of FIG.

Embodiment 1 FIG.
*** Explanation of configuration ***
The configuration of radio communication system 500 according to the present embodiment will be described using FIG.
The wireless communication system 500 is a wireless multi-hop network system using TSCH. In this embodiment, a communication timing allocation method of a wireless multi-hop network system using TSCH will be described.
Note that the communication timing means a communication time zone. Reception timing means a reception time zone, and transmission timing means a transmission time zone.

The wireless communication system 500 includes a termination device 20 and a node device 10 that transmits a message to the termination device 20 by wireless communication. The wireless communication system 500 includes a plurality of node devices 10 and a termination device 20, and has a tree topology. In the wireless communication system 500, the termination device 20 and the plurality of node devices 10 constitute a wireless multi-hop network system. That is, the plurality of node devices 10 include the node device 10 that transmits a message to the termination device 20 via another node device.

It should be noted that one or more node devices 10 and termination devices 20 are required, and the number shown in FIG. 1 is an example, and the present invention is not limited to this. Each node device 10 has the same function. Each of the node device 10 and the terminal device 20 has individual identification information. The node device 10 will be described as having identification information 10a_adr, 10b_adr, and 10c_adr, respectively, and the termination device 20 will be described as having identification information 20_adr.

When the node device 10 receives a signal from another node device 10 or the termination device 20, the node device 10 checks whether or not the transfer is necessary, and performs transfer processing when the transfer is necessary. Further, the node device 10 and the terminal device 20 perform time synchronization. It is assumed that the time information held in the terminal device 20 can be synchronized by transferring it to each node device 10.

The configuration of the node device 10 according to the present embodiment will be described with reference to FIG.
In the present embodiment, the node device 10 is a computer. The node device 10 includes hardware such as an antenna 41, an RFIC (Radio Frequency Integrated Circuit) 42, a processor 43, a memory 44, a power supply circuit 45, and a power supply holding unit 18.
Further, the node device 10 includes a wireless communication unit 12, a transmission unit 13, a reception unit 14, a generation unit 15, a determination unit 17, and a storage unit 16 as functional configurations. In the following description, the functions of the transmission unit 13, the reception unit 14, the generation unit 15, and the determination unit 17 in the node device 10 are referred to as “unit” functions of the node device 10. The function of the “unit” of the node device 10 is realized by software. The wireless communication unit 12 is realized by the RFIC 42. The storage unit 16 is realized by the memory 44.

With reference to FIG. 3, the configuration of termination apparatus 20 according to the present embodiment will be described. The configuration of the termination device 20 is the same as the configuration of the node device 10. The terminal device 20 includes an external interface 56 in addition to the configuration of the node device 10.
In the present embodiment, termination device 20 is a computer. The termination device 20 includes hardware such as an antenna 51, an RFIC 52, a processor 53, a memory 54, a power supply circuit 55, an external interface 56, and a power supply holding unit 28.
Moreover, the termination | terminus apparatus 20 is provided with the radio | wireless communication part 22, the transmission part 23, the receiving part 24, the production | generation part 25, the determination part 27, and the memory | storage part 26 as a function structure. In the following description, the functions of the transmission unit 23, the reception unit 24, the generation unit 25, and the determination unit 27 in the termination device 20 are referred to as “unit” functions of the termination device 20. The function of the “unit” of the termination device 20 is realized by software. The wireless communication unit 22 is realized by the RFIC 52. The storage unit 26 is realized by the memory 54.

The hardware of the node device 10 and the termination device 20 are similar. The antenna 51 is common to the antenna 41, the RFIC 52 is common to the RFIC 42, the processor 53 is common to the processor 43, and the memory 54 is common to the memory 44.
The

RFICs

42 and 52 have radio signal transmission and reception functions. The

power supply circuits

45 and 55 supply a battery or an external power supply to the

RFICs

42 and 52, the processors 43 and 53, the memories 44 and 54, and the like. The external interface 56 provided in the termination device 20 is a communication circuit such as Ethernet (registered trademark) or a signal reception circuit such as GPS (Global Positioning System).
The node device 10 and the termination device 20 include a receiver and a transmitter as communication devices. Specifically, the communication device may be a communication chip or a NIC (Network Interface Card). The communication device functions as a communication unit that communicates data.

The

storage units

16 and 26 are realized by the memories 44 and 54, respectively, but may be realized by a memory and an auxiliary storage device. A method for realizing the storage unit is arbitrary.

The processors 43 and 53 are connected to other hardware via a signal line, and control these other hardware.
The processors 43 and 53 are ICs (Integrated Circuits) that perform processing. The processors 43 and 53 are CPU (Central Processing Unit).

Specifically, the memories 44 and 54 are RAM (Random Access Memory). Specifically, the auxiliary storage device is a ROM (Read Only Memory), a flash memory, or an HDD (Hard Disk Drive).

Although not shown, the auxiliary storage device stores a program for realizing the function of “unit”. A program that realizes the function of “unit” is also referred to as a wireless communication program 520. This program is loaded into the memories 44 and 54, read into the processors 43 and 53, and executed by the processors 43 and 53. The auxiliary storage device also stores an OS (Operating System). At least a part of the OS is loaded into the memories 44 and 54. The processors 43 and 53 execute a program for realizing the function of “unit” while executing the OS.

The node device 10 and the termination device 20 may each include only one processor 43, 53, or may include a plurality of processors 43, 53. A plurality of processors 43 and 53 may execute a program for realizing the function of “unit” in cooperation with each other.

Information, data, signal values, and variable values indicating the result of the processing of “part” are stored in the auxiliary storage device, the memories 44 and 54, or the registers or cache memories in the processors 43 and 53.
2 and 3, the arrows connecting the respective units and the

storage units

16 and 26 indicate that each unit stores the processing results in the

storage units

16 and 26, or that each unit receives information from the

storage units

16 and 26. Represents reading. In addition, arrows connecting the respective parts represent the flow of control or data.

The program for realizing the function of “part” may be stored in a portable recording medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD (Digital Versatile Disc).
Note that what is referred to as a wireless communication program product is a storage medium and a storage device on which a program that realizes the function described as “part” is recorded, and is a computer-readable program regardless of the appearance format. Is what you are loading.

*** Explanation of message structure ***
First, the configuration of messages transmitted and received by the node device 10 and the termination device 20 will be described. The message is a radio signal that is transmitted and received by the node device 10 and the termination device 20, that is, a frame. In the following description, a message may be referred to as a frame.

FIG. 4 is a diagram illustrating a configuration example of the setting request 40 according to the present embodiment. The setting request 40 is a message for requesting setting of a transmission time zone in which the node device 10 transmits a message to the terminal device 20. The setting request 40 is also called a timing setting request.
In the local destination 410, the MAC address or IP address of the node device 10 or the termination device 20 that is the transmission destination is set.
In the local transmission source 420, the MAC address or IP address of the node device 10 or the termination device 20 that is the transmission source is set.
Since the destination of the setting request 40 is the terminating device 20 in the global destination 430, the MAC address or IP address of the terminating device 20 is set.
The global transmission source 440 is set with the MAC address or IP address of the node device 10 that is the transmission source.
The values of the local destination 410 and the local transmission source 420 are rewritten at every transfer. As a specific example, a case where the setting request 40 is transmitted from the node device 10 (10b_adr) to the terminal device 20 (20_adr) will be described. In this case, the local destination 410 is the node device 10 (10a_adr), the local transmission source 420 is the node device 10 (10b_adr), the global destination 430 is the termination device 20 (20_adr), and the global transmission source 440 is the node device 10 (10b_adr). . However, when the node device 10 (10a_adr) transfers the setting request 40, the global transmission source 440 and the global destination 430 are unchanged, but the local transmission source 420 sends the local destination 410 to the node device 10 (10a_adr). Is changed to the terminating device 20 (20_adr) and transferred.
The message type 450 includes information indicating that the setting request 40 is present.

FIG. 5 is a diagram illustrating a configuration example of the setting response 50 according to the present embodiment. The setting response 50 is transmitted to the node device 10 that has transmitted the setting request 40.
Therefore, the global destination 430 is set to the node device 10 that transmitted the setting request 40, and the global transmission source 440 is set to the terminating device 20 (20_adr). The terminating device 20 starts transmitting the setting response 50.
Since the local destination 410 and the local transmission source 420 have already been described, description thereof will be omitted. The message type 450 includes information indicating that it is the setting response 50. The setting response 50 is a time synchronization response message used for time synchronization between the terminal device 20 and the node device 10.
In the response time zone 460, identification information indicating a time zone not currently used by the terminal device 20 is set.

*** Explanation of functional configuration of node device 10 ***
Here, each part which is a function structure of the node apparatus 10 which concerns on this Embodiment is demonstrated.
The radio communication unit 12 transmits / receives a radio signal, that is, a data frame, to / from another node device 10 or the termination device 20 via the antenna 41.
The generation unit 15 generates a message that needs to be transmitted or transferred to another node device 10 or the termination device 20. The generation unit 15 is also referred to as a message generation unit. When transferring a message, the generation unit 15 receives a message to be transferred from the determination unit 17. In addition, the generation unit 15 newly generates a message such as time synchronization, terminal authentication, and a measurement value acquired from a sensor (not shown). Further, the generation unit 15 generates a setting request 40. The process for generating the setting request 40 will be described later.

The transmission unit 13 receives a message that needs to be transmitted to the other node device 10 or the termination device 20 from the generation unit 15 and requests the wireless communication unit 12 to transmit the message. As a specific example, the transmission unit 13 performs a calculation such as a transmission time zone by a method such as CSMA-CA or TDMA. 802.15.4e TSCH is a communication standard that allows CSMA-CA and TDMA to be mixed by separating time zones. When transmitting by TDMA, the transmission time is determined based on the time supplied from the time holding unit 18.

As a specific example, in a wireless multi-hop system assumed in the wireless communication system 500, a measurement result such as a temperature measured by the generation unit 15 is transmitted once every 30 minutes. In this case, the time zone for transmitting sensor information is TDMA, and CSMA-CA can be used in other time zones. In the present embodiment, a method of arbitrating a time zone in which each node device 10 transmits a message including sensor information when transmitting by TDMA is shown.

The receiving unit 14 receives a message transmitted from the other node device 10 or the terminating device 20 to the own device, and notifies the determination unit 17 of the message. The receiving unit 14 may correct the absolute time held by the time holding unit 18 based on the timing at which the message is received.

The storage unit 16 holds the MAC address or IP address of the own node device, and the MAC address or IP address of the other node device 10 or the terminating device 20 of the transmission destination. In addition, the storage unit 16 may hold a routing table, that is, route information. As a specific example, the storage unit 16 manages address information of a parent node device that is a destination of the next hop as a route to the terminal device 20.

The determination unit 17 analyzes the message received from the reception unit 14 and causes the generation unit 15 to generate a response message. In addition, the determination unit 17 sets and reads a value with the storage unit 16, and transmits a message generation trigger to the generation unit 15.
Upon receiving the setting request 40 that is a message according to the present embodiment, the determination unit 17 requests the generation unit 15 to generate a message for transfer. Since the message is transferred toward the global destination 430 of the setting request 40, the message needs to be transmitted toward the local destination 410 serving as a route of the global destination 430. That is, the local destination 410 is replaced with the MAC address or IP address of the parent node device serving as the next hop destination stored in the storage unit 16. The transmission unit 13 transmits a message in which the local destination 410 is replaced.
Furthermore, when the determination unit 17 receives the setting response 50 and the setting response 50 is addressed to the own device, that is, when the global destination 430 is the own device, the determination unit 17, based on the response time zone 460 included in the setting response 50, A transmission time zone in which the device transmits a frame is determined. Further, when the setting response 50 is not addressed to the own device, that is, when the global destination 430 is not the own device, the determination unit 17 transmits the transmission time zone in which the own device transmits, and the node device 10 that is a child of the own device. To determine the node reception time zone for receiving messages from

The time holding unit 18 is a clock circuit composed of a crystal resonator or the like, and is self-running after setting the time and holds the time. It is assumed that the time holding unit 18 can perform time synchronization by notification from GPS or NTP (Network Time Protocol) or the terminal device 20. The time holding unit 18 may perform time synchronization based on the message reception timing, that is, the reception time zone, according to the IEEE 802.15.4e standard.

*** Explanation of functional configuration of termination device 20 ***
Next, each part which is a function structure of the termination | terminus apparatus 20 which concerns on this Embodiment is demonstrated.
Each functional unit constituting the termination device 20 is similar to each functional unit constituting the node device 10, and differences will be described below.

Each element constituting the node device 10 and the termination device 20 includes those that perform the same operation, and are listed as follows. Since the antenna 41 and the antenna 51, the wireless communication unit 12 and the wireless communication unit 22, the transmission unit 13 and the transmission unit 23, and the reception unit 14 and the reception unit 24 have the same configuration, description thereof will be omitted.

When the determination unit 27 determines that the received message is the setting request 40, the determination unit 27 sets the time zone. Specific processing will be described later.

When the generation unit 25 receives the setting request 40, the generation unit 25 generates a setting response 50 using the time zone set by the determination unit 27 and requests the transmission unit 23 to transmit the setting response 50.

Unlike the storage unit 16 in the node device 10, the storage unit 26 in the termination device 20 does not hold the next hop route information to go to the termination device 20. Further, the termination device 20 may hold information on the downlink route from the own device, that is, the downlink route regarding each node device 10 accommodated in the termination device 20.

The time holding unit 28 can set the time supplied from an NTP server or the like via the external interface 56.

*** Explanation of operation ***
<Wireless communication processing S100>
FIG. 6 is a diagram showing a wireless communication process 510 in the wireless communication method 510 and the wireless communication program 520 in the wireless communication system 500 according to the present embodiment.
Here, a method will be described in which, after the node device 10 (10a_adr, 10b_adr) joins the network, the transmission time zone of sensor information is assigned to the termination device 20 using TDMA.

In the following description, it is assumed that wireless multi-hop path construction and sensor information transmission time zones are assigned outside the time zone in which TDMA is operated. As a specific example, it is assumed that the node device 10 transmits sensor information twice per hour. Specifically, it is assumed that the node device 10 transmits sensor information in a time zone of 00 minutes to 01 minutes per hour and 30 minutes to 31 minutes per hour. Here, it is assumed that one hour is divided into six in a time frame of 10 minutes, and the node device 10 transmits sensor information to the terminal device 20 in any of these six time zones. The six time zones will be described as time zone 1 to time zone 6, respectively.

When sensor information is transmitted as described above, if there is no arbitration, the transmission timings of the node device 10 (10a_adr) and the node device 10 (10b_adr) are the same, and transmission is performed within the allocated time width. Problems such as inability to occur. In addition, before the node device 10 (10a_adr) transmits the sensor information attached to the node device 10 (10a_adr), the information from the node device 10 (10b_adr) is received, and this information must be transferred first. In the transmission time zone, the information to be transmitted must be kept in the memory. This is not a problem when the number of terminals trying to transmit frames via the node device 10 (10a_adr) is small. However, when the number of terminals increases, the number of frames that are continuously queued by the node device 10 increases, Overflow may occur.

The wireless communication process S100 includes a setting request process S30, a setting response process S312 (end time zone determination process S31 and setting response transmission process S32), a node time zone determination process S33, and a relay node time zone setting process S34. .

In the setting request processing S30, the node device 10 (10a_adr) transmits a setting request 40 for requesting setting of the transmission time zone 101 in which the node device 10 (10a_adr) transmits a message to the terminal device 20. In the node device 10 (10a_adr), the time zone for transmitting the sensor information is in an undecided state, and therefore the node device 10 (10a_adr) transmits the setting request 40 to the terminal device 20.

In the setting response process S312, when the terminal device 20 receives the setting request 40, the terminal device 20 determines a terminal reception time zone 102 for receiving a message from the node device 10 (10a_adr) (terminal time zone determination processing S31). Specifically, the termination device 20 searches for a time that the termination device 20 is not using to receive a message, that is, an unused time zone. Then, the termination device 20 transmits the setting response 50 including the termination reception time zone 102 as the response time zone 460 to the node device 10 (10a_adr) (setting response transmission processing S32). FIG. 6 shows that the terminal device 20 notifies the time zone 6 as an unused time zone.

In the node time zone determination process S33, when receiving the setting response 50, the node device 10 (10a_adr) stores the response time zone 460 included in the setting response 50 in the storage unit 16 as the transmission time zone 101. That is, the node device 10 (10a_adr) determines a time zone for transmitting sensor information based on the information of the time zone 6 included in the notified response time zone 460.

Next, since the transmission time zone 101 in which the node device 10 (10b_adr) transmits the sensor information has not been determined, the node device 10 (10b_adr) transmits the setting request 40 to the terminal device 20 in the setting request process S30. To do. The setting request 40 transmitted from the node device 10 (10b_adr) is transmitted to the termination device 20 via the node device 10 (10a_adr).
In the termination time zone determination process S31, the termination device 20 searches for a time zone that is not used by the termination device 20 for frame reception, that is, an unused time zone.
In the setting response process S32, the terminating device 20 returns a setting response 50. At this time, the terminal device 20 notifies the time zone 4 indicating the unused time zone.

In the relay node time zone determination process S34, when receiving the setting response 50, each node device 10 of the plurality of node devices determines whether or not the setting response 50 is a response to the setting request 40 transmitted from the own device. . Each node device 10 of the plurality of node devices determines a time zone for receiving a message as the node reception time zone 103 when the setting response 50 is not a response to the setting request 40 transmitted from the own device. Each node device 10 of the plurality of node devices rewrites the response time zone 460 included in the setting response 50 to the node reception time zone 103, and transmits the setting response 50 in which the response time zone 460 is rewritten.
The node device 10 (10a_adr) operates as a relay terminal from the node device 10 (10b_adr) that is the transmission source of the setting request 40. Therefore, the node device 10 (10a_adr) includes a transmission time zone 101 in which the node device 10 (10a_adr), which is its own device, transmits to the termination device 20, and a node reception time zone 103 in which a frame is received from the node device 10 (10b_adr). Determine both. In FIG. 6, the transmission time zone 101 transmitted from the node device 10 (10a_adr) to the termination device 20 is determined as the time zone 4, and the node reception time zone 103 receiving the frame from the node device 10 (10b_adr) is determined as the time zone 3.

Thereafter, in the setting response process S32, the setting response 50 is returned to the node device 10 (10b_adr). Here, the response time zone 460 set in the set response 50 is the time zone 3 that is the node reception time zone 103 determined by the node device 10 (10a_adr).
Next, in the node time zone determination process S33, when receiving the setting response 50, the node device 10 (10b_adr) transmits its sensor information in the time zone 3 that is the response time zone 460 notified by the setting response 50. The transmission time zone 101 is determined.

<Termination time zone determination process S31>
The termination time zone determination process S31 by the termination device 20 according to the present embodiment will be described in detail with reference to FIGS.
FIG. 10 is a time zone chart 261 stored in the storage unit 26 by the terminal device 20. In the time zone chart 261, a terminal reception time zone 102 and a dummy time zone 104 are set.

When the termination device 20 receives the setting request 40, the termination device 20 searches for an unused time zone from the time zone chart 261, and executes a termination time zone determination process S31 for determining the search result as the termination reception time zone 102.
In step S311, the determination unit 27 searches for an unused time zone in the upper time zone chart 261 of FIG. In the upper time zone chart 261 in FIG. 10, all the time zones are unused.
In step S312, the determination unit 27 determines the latest time zone 6 among the unused time zones in the time zone chart 261 as the termination reception time zone 102 in which the termination device 20 receives. The determination unit 27 sets the time zone 6 as the termination reception time zone 102 as shown in the time zone chart 261 in the lower part of FIG.
In step S 313, when the determination unit 27 receives the setting request 40, the determination unit 27 determines the end reception time zone 102 and sets a time zone adjacent to the end reception time zone 102 and before the end reception time zone 102 as a dummy. The time zone 104 is determined. As shown in the time zone chart in the lower part of FIG. 10, the time zone 5 that is the time zone immediately before the time zone 6 is set as the dummy time zone 104.
In step S314, the generation unit 25 generates a setting response 50 with the response time zone 460 as the time zone 6 and requests the transmission unit 23 to transmit.

As illustrated in FIG. 6, in the setting response process S <b> 32, the transmission unit 23 of the termination device 20 transmits the setting response 50 in which the time zone 6 is set as the response time zone 460 via the wireless communication unit 22 and the antenna 51. To do.
Note that the dummy time zone 104 is not notified to the node device 10, but is set as a flag for excluding from the candidates for the terminal reception time zone 102.

<Node time zone determination processing S33>
Next, the node time zone determination processing S33 according to the present embodiment will be described with reference to FIGS.
FIG. 11 is a time zone chart 161a stored in the storage unit 16 by the node device 10 (10a_adr).
The node time zone determination processing S33 is processing for determining the transmission time zone 101 of the own device when the node device 10 (10a_adr) receives the setting response 50. Since the node device 10 (10a_adr) is the transmission source of the setting request 40 this time, the node device 10 (10a_adr) executes the node time zone determination process S33.

In step S331, the determination unit 17 of the node device 10 (10a_adr) determines the time zone 6 notified by the setting response 50 as the transmission time zone 101. That is, the determination unit 17 of the node device 10 (10a_adr) determines to transmit the sensor information in the time zone 6. The determination unit 17 sets the time zone 6 as the transmission time zone 101 as shown in the time zone chart 161a in the lower part of FIG.

The above description shows the operation when the terminal device 20 and the node device 10 that transmits the setting request 40 are adjacent to each other.
Next, a case where the node device 10 transmits the setting request 40 and is relayed by one or more node devices 10 will be described.
Here, it is assumed that the time zone chart 261 of the termination device 20 is in the state of FIG. 12 in which the node device 10 (10a_adr) has already assigned the time zone.

The node device 10 (10b_adr) transmits the setting request 40. The setting request 40 is transferred by the node device 10 (10a_adr) and received by the termination device 20. When the termination device 20 receives the setting request 40, the termination device time zone determination processing S31 described above is performed.
The termination device 20 receives the setting request from the node device 10 (10a_adr) after the setting request 40 from the node device 10 (10a_adr). In this way, when receiving the setting request 40 after the setting request 40, the terminating device 20 determines a time zone for receiving a message from other than the terminating reception time zone 102 set in the time zone chart 261. Specifically, the termination device 20 determines a time zone for receiving a message from other than the termination reception time zone 102 and other than the dummy time zone 104. As shown in FIG. 12, the terminating device 20 selects a time zone 4 that is neither a reception time zone nor a dummy time zone, and sets the time zone 3 as a dummy time zone. Then, the terminal device 20 includes the time zone 4 as the response time zone 460 in the setting response 50 for the setting request received after the setting request 40. That is, the termination device 20 transmits a setting response 50 with the time zone 4 as the reception time zone to the node device 10 (10a_adr).
When the node device 10 (10a_adr) receives the setting response 50, the node device 10 (10a_adr) performs the operation of the relay node time zone setting process S34. Hereinafter, the relay node time zone setting process S34 will be described.

<Relay node time zone setting process S34>
The relay node time zone setting process S34 according to the present embodiment will be described with reference to FIGS.
FIG. 13 is a time zone chart 161a stored in the storage unit 16 by the node device 10 (10a_adr).
In step S341, the determination unit 17 of the node device 10 (10a_adr) determines the transmission time zone 101 based on the response time zone 460 included in the notified setting response 50.
As illustrated in the lower part of FIG. 13, the determination unit 17 determines to perform transmission in the time period 4 notified by the setting response 50, and uses the time period 4 of the time period chart 161 a illustrated in the lower part of FIG. 13 as the transmission time period. 101 is set.

In step S342, the determination unit 17 of the node device 10 (10a_adr) determines whether the setting response 50 is a response to the setting request 40 transmitted from the own device based on the global destination 430 of the setting response 50. . The determination unit 17 of the node device 10 (10a_adr) determines the time zone for receiving a message for transfer as the node reception time zone 103 when the setting response 50 is not a response to the setting request 40 transmitted from the own device. To do. Whether or not the setting response 50 is transmitted from the own device is determined based on whether or not the global destination 430 of the setting response 50 is the own device.
The determination unit 17 of the node device 10 (10a_adr) determines the node reception time zone 103 based on the determined transmission time zone 101. As illustrated in the lower part of FIG. 13, the determination unit 17 determines that reception is performed in the time period 3 immediately before the transmission time period 101, and the time period 3 in the time period chart 161 a illustrated in the lower part of FIG. The reception time zone 103 is set.

In step S343, the generation unit 15 of the node device 10 (10a_adr) rewrites the response time zone 460 included in the setting response 50 to the node reception time zone 103, and transmits the setting response 50 in which the response time zone 460 is rewritten. Specifically, the generation unit 15 generates a setting response 50 in which the response time zone 460 is the time zone 3 and requests the transmission unit 13 to transmit.

Next, in the setting response process S32, the transmission unit 13 of the node device 10 (10a_adr) transmits the setting response 50 in which the time zone 3 is set as the response time zone 460 via the wireless communication unit 12 and the antenna 41. .

FIG. 14 is a time zone chart 161b stored in the storage unit 16 by the node device 10 (10b_adr).
The node device 10 (10b_adr) executes the above-described node time zone determination process S33, determines that transmission is performed in the time zone 3 received by the setting response 50, and the time of the time zone chart 161b shown in the lower part of FIG. Band 3 is set as a transmission time band 101.

This completes the description of the wireless communication processing S100 in the wireless communication system 500 according to the present embodiment.

*** Other configurations ***
In the present embodiment, the function of each “unit” of the node device 10 and the termination device 20 is realized by software. However, as a modification, the function of each “unit” of the node device 10 and the termination device 20 is hardware. It may be realized by hardware.
The configuration of the node device 10 and the termination device 20 according to a modification of the present embodiment will be described with reference to FIGS. 15 and 16.
As illustrated in FIG. 6, the node device 10 and the termination device 20 may include processing circuits 49 and 59. The processing circuits 49 and 59 are dedicated electronic circuits for realizing the above-described “unit” function and the

storage units

16 and 26. Specifically, the processing circuits 49 and 59 are a single circuit, a composite circuit, a programmed processor, a processor programmed in parallel, a logic IC, a GA (Gate Array), an ASIC (Application Specific Integrated Circuit), or an FPGA. (Field-Programmable Gate Array).

The function of each “unit” of each of the node device 10 and the terminal device 20 and the

storage units

16 and 26 may be realized by a single processing circuit 49 or 59, or may be realized by being distributed to a plurality of processing circuits 49 and 59. May be.

As another modification, the functions of the node device 10 and the termination device 20 may be realized by a combination of software and hardware. That is, some functions of each of the node device 10 and the termination device 20 may be realized by dedicated hardware, and the remaining functions may be realized by software.

The processors 43 and 53, the memories 44 and 54, and the processing circuits 49 and 59 are collectively referred to as a “processing circuit”. That is, regardless of the configuration of each of the node device 10 and the termination device 20 shown in FIGS. 2, 3, 15, and 16, the function of the “unit” and the

storage units

16 and 26 are processed. Realized by circuit.

“Part” may be read as “Process”, “Procedure” or “Process”. Further, the function of “unit” may be realized by firmware.

*** Explanation of effects according to this embodiment ***
As described above, in the present embodiment, the time zone for message transmission / reception is negotiated between the terminal device and each node device of the plurality of node devices in the terminal device and the plurality of node devices constituting the wireless multi-hop network system. The negotiation method is explained. In this embodiment, when each node device transmits a message to the termination device, the transmission time zone of each node device, the reception time zone and the transmission time zone of the node device that performs transfer, and the termination device receive data. By mediating the reception time zone, it is possible to prevent data from staying in the transferring node device.

Further, according to the wireless communication system according to the present embodiment, it is possible to arbitrate between the transmission time zone (transmission timing) and the reception time zone (reception timing) between the node device 10 and the termination device 20. . Further, as described above, when the node device 10 (10b_adr) transfers data, it is necessary to transfer a message in the node device 10 (10a_adr). Since the message transfer is performed in the adjacent time zone, the message residence time in the node device 10 (10a_adr) can be minimized. Therefore, even if the queue length required for the node device 10 is reduced, it is possible to minimize the decrease in the data collection rate due to the message queue overflow.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.
In this embodiment, the description of the same structure as that described in Embodiment 1 is omitted. The configurations of the node device 10 and the termination device 20 are the same as those in the first embodiment.

In the first embodiment, the terminal device 20 uses the time zone adjacent to the time zone determined as the terminal reception time zone 102 as the dummy time zone 104, and the dummy time zone 104 receives the setting request from the other terminal to the terminal device 20. Control that was not used sometimes was carried out. Specifically, the time zone 3 adjacent to the time zone 4 in FIG. 12 determined by the termination device 20 as the termination reception time zone 102 is the dummy time zone 104.
In the present embodiment, the node device 10 that has transmitted the setting request 40 and the terminal device 20 that has received the setting request 40 are adjacent to each other, that is, when no transfer is performed by another node device 10. The time zone 104 is not set.
That is, when receiving the setting request 40, the terminating device 20 according to the present embodiment determines whether the setting request 40 is transmitted from the adjacent node device 10x adjacent to the terminating device 20 among the plurality of node devices 10. . When the setting request 40 is not transmitted from the adjacent node device 10x, the termination device 20 sets a time zone adjacent to the termination reception time zone 102 and before the termination reception time zone 102 as the dummy time zone 104. decide. The terminal device 20 does not determine the dummy time zone 104 when the setting request 40 is transmitted from the adjacent node device 10x.

FIG. 17 is a flowchart of the termination time zone determination process S31a in the present embodiment. FIG. 17 shows an operation when the terminating device 20 receives the setting request 40 in the present embodiment. In FIG. 17, step S311, step S312, step S313, and step S314 are the same as those described in the first embodiment, and thus description thereof is omitted.

In step S315, the determination unit 27 of the termination device 20 determines whether or not the received setting request 40 is transmitted from the adjacent node device 10x that is the adjacent node device 10. If it is determined that the termination device 20 has received the setting request 40 from the node device 10 (10a_adr) that is adjacent to the termination device 20 (YES in step S315), the determination unit 27 does not set the dummy time zone 104. In the case of NO in step S315, the determination unit 27 proceeds to step S313 and sets the dummy time zone 104.
Specifically, the determination unit 27 determines whether the global transmission source 440 and the local transmission source 420 included in the setting request 40 from the node device 10 (10a_adr) match. If they match, it is determined that the setting request 40 has been received from the adjacent terminal. If they do not match, it is determined that the setting request 40 is not from the adjacent node device 10x.
Further, the determination unit 27 determines whether or not the transmission is from the adjacent node device 10x based on the information of the routing table stored in the storage unit 26, or the number of transfers (not shown) included in the setting request 40. May be.

FIG. 18 is a diagram illustrating time zones of the respective devices determined by the series of processes in FIG. 6 according to the first embodiment. FIG. 19 is a diagram showing the time zone of each device when the termination time zone determination processing S31a according to the present embodiment is replaced with the termination device time zone determination processing S31 of FIG.
By using the termination time zone determination process S31a according to the present embodiment, the idle time in the termination device 20 can be reduced, and therefore the number of node devices 10 accommodated per termination device 20 can be improved. That is, in FIG. 18, the time zone 5 is a dummy time zone in the termination device 20 and is not used in other terminals, but the termination device 20 can receive in the time zone 5 in FIG. 19. Therefore, the time zone in which the node device 10 (10b_adr) transmits and the time zone in which the node device 10 (10a_adr) transmits the frame to be transferred can be set to the time zone 4 and the time zone 5, respectively.

*** Explanation of effects of this embodiment ***
As described above, according to the wireless communication system 500 according to the present embodiment, the idle time in the termination device 20 can be reduced, so that the number of node devices 10 accommodated in the termination device 20 can be improved. .

The wireless communication system, the terminal device, the node device, the wireless communication method, and the wireless communication program according to the first and second embodiments are useful for wireless communication, particularly when restarting after simultaneous power-off of a plurality of node devices. Useful.

Further, only one of those described as “parts” in the description of

Embodiments

1 and 2 may be adopted, or some arbitrary combinations may be adopted. That is, the functional configurations of the node device 10 and the termination device 20 are arbitrary as long as the functions described in the above embodiments can be realized. Each of the node device 10 and the termination device 20 may be configured in any combination or arbitrary functional configuration.

Moreover, you may implement combining some among these

Embodiment

1 or 2 partially. Alternatively, one of these embodiments may be partially implemented. In addition, these embodiments may be implemented in any combination in whole or in part.
In addition, said embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use, A various change is possible as needed. .

10 node device, 10x adjacent node device, 12 wireless communication unit, 13 transmission unit, 14 reception unit, 15 generation unit, 17 determination unit, 16 storage unit, 18 time holding unit, 40 setting request, 41 antenna, 42 RFIC, 43 Processor, 44 memory, 45 power supply circuit, 49 processing circuit, 20 termination device, 22 wireless communication unit, 23 transmission unit, 24 reception unit, 25 generation unit, 27 determination unit, 28 time holding unit, 26 storage unit, 50 setting response , 51 antenna, 52 RFIC, 53 processor, 54 memory, 55 power supply circuit, 56 external interface, 101 transmission time zone, 102 terminal reception time zone, 103 node reception time zone, 104 dummy time zone, 161, 161a, 161b, 261 Time zone chart, 410 local Destination, 420 local transmission source, 430 global destination, 440 global transmission source, 450 message type, 460 response time zone, 500 wireless communication system, 510 wireless communication method, 520 wireless communication program, S100 wireless communication processing, S30 setting request processing, S312 setting response processing, S31, S31a termination time zone determination processing, S32 setting response transmission processing, S33 node time zone determination processing, S34 relay node time zone setting processing.

Claims

In a wireless communication system comprising a termination device and a node device that transmits a message to the termination device by wireless communication,
The node device is
Sending a setting request for requesting setting of a transmission time zone for transmitting the message to the terminating device,
The terminator is
When the setting request is received, a terminal reception time zone for receiving the message from the node device is determined, and a setting response including the terminal reception time zone as a response time zone is transmitted to the node device,
The node device is
When the setting response is received, the wireless communication system stores the response time zone included in the setting response in the storage unit as the transmission time zone.
The wireless communication system includes:
A plurality of the node devices;
The plurality of node devices are:
A node device that transmits the message to the termination device via another node device;
Each node device of the plurality of node devices,
When the setting response is received, it is determined whether or not the setting response is a response to the setting request transmitted from the own device, and the setting response is not a response to the setting request transmitted from the own device. Determining a time zone for receiving the message as a node reception time zone;
The wireless communication system according to claim 1, further comprising: a transmission unit that rewrites the response time zone included in the setting response to the node reception time zone and transmits the setting response with the rewritten response time zone.
The wireless communication system includes:
The wireless communication system according to claim 1 or 2, wherein a wireless multi-hop network system is configured by the termination device and the plurality of node devices.
In a terminal device in which the message is transmitted from each node device of a plurality of node devices including a node device that is a plurality of node devices and transmits a message by wireless communication via another node device,
When a setting request for requesting setting of a transmission time zone for transmitting the message is received from each node device of the plurality of node devices, a terminal reception time zone for receiving the message from each node device of the plurality of node devices is determined. And a termination device that transmits a setting response including the termination reception time zone as a response time zone.
The terminator is
5. When a setting request is received after the setting request, a time zone for receiving the message is determined from other than the terminal reception time zone, and is included as a response time zone in a setting response to the setting request received after the setting request. The termination device as described in.
The terminator is
When the setting request is received, a time zone adjacent to the terminal reception time zone and before the terminal reception time zone is determined as a dummy time zone, and when the setting request is received after the setting request, The termination device according to claim 5, wherein a time zone for receiving the message is determined from a time other than the termination reception time zone and other than the dummy time zone.
The terminator is
When the setting request is received, it is determined whether the setting request is transmitted from an adjacent node device adjacent to the terminal device among the plurality of node devices, and the setting request is not transmitted from the adjacent node device. 6. The termination device according to claim 5, wherein a time zone adjacent to the termination reception time zone and before the termination reception time zone is determined as a dummy time zone.
In a node device that transmits a message by wireless communication to a terminal device included in a wireless communication system constituting a wireless multi-hop network system,
A transmission unit that transmits a setting request for requesting setting of a transmission time zone for transmitting the message to the terminal device;
When a setting response including a response time zone is received, it is determined whether or not the setting response is a response to the setting request transmitted from the own device, and the setting response corresponds to the setting request transmitted from the own device. If the response is a response, the response time zone is stored in the storage unit as the transmission time zone, and if the setting response is not a response to the setting request transmitted from the device, the response time zone is set to the transmission time. A determination unit for storing a time zone for storing the message as a band and receiving the message as a node reception time zone;
A node device comprising: a transmission unit that rewrites the response time zone included in the setting response to the node reception time zone and transmits the setting response with the response time zone rewritten.
In a wireless communication method of a wireless communication system, comprising: a termination device; and a node device that transmits a message to the termination device by wireless communication.
The node device transmits a setting request for requesting setting of a transmission time zone for transmitting the message to the terminal device,
When the terminal device receives the setting request, the terminal device determines a terminal reception time zone for receiving the message from the node device, and transmits a setting response including the terminal reception time zone as a response time zone to the node device,
When the node device receives the setting response, the wireless communication method stores the response time zone included in the setting response in the storage unit as the transmission time zone.
In a wireless communication program of a wireless communication system comprising a termination device and a node device that transmits a message to the termination device by wireless communication,
A setting request process for transmitting a setting request for requesting setting of a transmission time zone in which the node device transmits the message to the terminal device;
When the termination device receives the setting request, the termination device determines a termination reception time zone in which the message is received from the node device, and a setting response including the termination reception time zone as a response time zone is sent to the node device. Setting response processing to send,
When the node device receives the setting response, a wireless communication program that causes a computer to execute node time zone determination processing for storing the response time zone included in the setting response in the storage unit as the transmission time zone.