KR102151084B1 - Distributed Channel Hopping Radio listening Synchronization Device and Method Using Rendezvous Chain Based TSCH - Google Patents

Abstract

The present invention provides a TSCH-based rendezvous chain that exchanges ERB (Enhanced Rendezvous Beacon) packets before joining the network to form a rendezvous chain, and each communication node device divides and listens to channels to increase the probability of receiving EB packets. A packet reception module that changes a reception channel, manages EB/ERB packets, receives ERBs, and transmits EB packets to rendezvous neighbors; a transmission channel change and EB priority. An EB transmission module that manages a channel vector table; a channel vector management module that manages a channel vector table and stores it in a channel vector table by modifying when a channel is divided; manages the rendezvous neighbor table according to the channel vector determination result of the channel vector management module, It includes a rendezvous neighbor management module for adding and deleting rendezvous neighbors and managing rendezvous neighbor information; an ERB transmission module for managing ERB packet transmission by changing a transmission channel.

Description

Distributed Channel Hopping Radio listening Synchronization Device and Method Using Rendezvous Chain Based TSCH}

The present invention relates to an industrial wireless sensor network, and specifically, before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides a channel and listens to increase the probability of receiving EB packets. The present invention relates to an apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain.

IEEE 802.15.4e is a standard that improves the MAC layer for the industrial wireless sensor network environment of the IEEE 802.15.4 standard and is included in the IEEE 802.15.4 (2015) revised bill.

Time Slotted Channel Hopping (TSCH) is one of the IEEE 802.15.4e modes and shows high reliability and low power operation.

In the IIoT (Industrial Internet of Things) environment, communication node devices operate on batteries and energy is limited, so energy consumption is the most important issue.

In the TSCH, data transmission is performed in units of timeslots, and a slotframe is composed of a bundle of timeslots.

All nodes continue to repeat the scheduled slot frame and perform one operation among transmit, receive, and sleep in the timeslot, and the duty cycle of radio usage, which is the majority of energy use of communication node devices, is ) Can be reduced.

TSCH is resistant to multi-path fading, which is a problem that easily occurs in an industrial environment through channel hopping. In order to use the multi-channel function of the TSCH, a channel offset and a time offset are assigned to each active slot.

The time offset defines a position within the slot frame and determines a channel to be used in the slot through Equation 1.

In Equation 1, V is a vector including usable channels, and the maximum number of channels in the 2.4GHz band defined in the standard is 16.

ASN is the absolute slot number that increases with every slot when the network is started.

Nch is the length of V, and mod represents the modulus operation. Since the ASN corresponding to the occurrence of each active slot changes for each cycle of the slot frame, the communication channel is changed according to Equation 1, and a different channel is used for each cycle of the slot frame through this mechanism, so channel hopping for each slot This is done.

TSCH creates a globally synchronized mesh network using a DAG (Directed Acyclic Graph), which has a coordinator, also known as a sink, as a source. The network is formed when the coordinator starts to advertise the existence of the network by transmitting an EB (Enhanced Beacon) frame containing information necessary for connection in the form of an information element (IE).

A node attempting to connect to the network scans for available channels and attempts to detect the presence of the network.

Here, the node is waiting for EB with the radio on continuously to listen to the EB, and the radio duty-cycle is 100%. Therefore, the later the network participation is, the more energy consumption increases.

During the scanning process, the node waits for EB on channel V using a round robin strategy. When a node receives EB from a node that has already joined the network, it detects the network and joins the network. The EB is generated using a periodic timer and is transmitted in the first slot of the slot frame after the timer starts.

The channel through which the EB is transmitted is determined using Equation 1, and only the coordinator starts EB transmission when the network starts. The node is a PAN coordinator or can initiate EB transmission when connected to a PAN. The node tries to connect to the network by listening continuously on all available channels until the coordinator or a node already connected to the network hears EB. The IEEE 802.15.4 standard does not define how to schedule EBs.

The prior art method is a passive method for EB reception and performs channel hopping until EB is received, and waits for EB packet reception. In the two communication node devices, since the packet transmission and reception channel hopping, there is a high possibility that the channel between the communication node device that transmits EB and the communication node device that will receive the EB is different, so the network participation time is relatively long.

In addition, if there is a communication node device'X' far away in the coordinator, the communication node device'Y' that is within a communication distance with the'X' between them first joins the network, and when'Y' transmits EB, Since'X' hears the EB and can participate in the network, in the case of a network consisting of multiple hops, the time until all communication node devices participate becomes longer as the number of hops is configured.

Therefore, development of a new technology for shortening the network participation time in an industrial wireless sensor network based on TSCH (Time Slotted Channel Hopping) is required.

Republic of Korea Patent Publication No. 10-2017-0036760 Republic of Korea Patent Publication No. 10-2018-0076793 Republic of Korea Patent Publication No. 10-2018-0137537

The present invention is to solve the problem of the conventional industrial wireless sensor network, distributed channel hopping using a TSCH-based rendezvous chain to increase the EB reception probability by forming a rendezvous chain to divide and listen to the EB receiving channel An object thereof is to provide an apparatus and method for synchronizing radio listening.

The present invention provides a TSCH-based rendezvous chain that exchanges ERB (Enhanced Rendezvous Beacon) packets before joining the network to form a rendezvous chain, and each communication node device divides and listens to channels to increase the probability of receiving EB packets. An object of the present invention is to provide an apparatus and method for synchronizing listening to distributed channel hopping radio using the method.

In the present invention, while transmitting and receiving channel hopping sequence information between each rendezvous neighbor in the process of exchanging ERB packets, when a communication node device participates in the network, the rendezvous neighbor immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. An object of the present invention is to provide an apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain that enables network participation.

In the present invention, before network participation, nodes exchange ERB (Enhanced Rendezvous Beacon) channel vector information, channel hopping information, and timing information packet, and determine whether or not to divide the channel vector in half with the received channel vector information. An object of the present invention is to provide an apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain capable of increasing the value.

Other objects of the present invention are not limited to the objects mentioned above, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

A distributed channel hopping radio listening synchronization apparatus using a TSCH-based rendezvous chain according to the present invention to achieve the above object changes a reception channel, manages EB/ERB packets, receives ERB, and transmits rendezvous neighbor EB packets. A packet receiving module to perform; An EB transmission module that changes a transmission channel and manages EB priority; a channel vector management module that manages a channel vector table and modifies and stores a channel vector table in a channel vector table; of the channel vector management module And a rendezvous neighbor management module that manages a rendezvous neighbor table according to a channel vector determination result, adds and deletes rendezvous neighbors, and manages rendezvous neighbor information; an ERB transmission module that manages ERB packet transmission by changing a transmission channel; and To do.

Here, the channel vector management module includes a channel vector table management unit that manages a channel list of a channel sequence vector to be currently channel-hopping, and when a'Send ChHV info' request is received, it compares with the current channel vector to determine whether or not the same channel vector line is And a channel vector correcting unit that corrects when a channel is divided according to the determination of the channel vector determination unit and stores it in a channel vector table.

The rendezvous neighbor management module determines whether the corresponding rendezvous member currently has when the channel vector management module requests'Add Rendezvous member', and determines whether the rendezvous neighbor table management unit and the rendezvous member currently have it. So, if there is no rendezvous neighbor addition unit that is added as a rendezvous neighbor, a rendezvous neighbor deletion unit that initializes the rendezvous neighbor when the network is disconnected, and when an ERB packet is received, it is notified to the ERB transmission module to share the channel with other communication node devices. It characterized in that it comprises a rendezvous neighbor information management unit.

In addition, the rendezvous neighbor information management unit is characterized by storing an ID of a communication node device adjacent to the rendezvous, hopping sequence timing information, channel vector line information, and RSSI (received signal strength).

In addition, the ERB transmission module includes a transmission channel change unit that changes a channel to be transmitted, a transmission channel timer unit that determines a period to transmit an ERB, an ERB packet transmission management unit that configures information to be included in the ERB packet, and when an ERB packet is received. , If the channel can be divided, a rendezvous neighbor response transmission unit that transmits its own ERB packet to a node that has transmitted the packet to divide the channel, and an ERB transmission unit that transmits the ERB packet.

In addition, the EB transmission module includes a transmission channel change unit for changing a channel to be transmitted, a transmission channel timer unit for determining a period to transmit an EB, and an EB packet to be received. In this case, when there is a rendezvous neighbor, an EB priority management unit that manages the priority to transmit EB to a corresponding channel first, and an EB transmission unit that performs EB transmission.

The packet reception module includes a reception channel change unit for changing a radio reception channel, a reception channel timer unit for managing reception channel timing, an EB/ERB packet management unit for separating EB and ERB packets, and a received ERB packet. In order to determine whether to divide the channel, the ERB receiver that obtains the information of the rendezvous member by requesting'Request Rendezvous member Info' to the rendezvous neighbor information management unit of the rendezvous neighbor management module, and informs the channel vector determination unit of the channel vector management module. When receiving an EB packet from a communication node device, if it is already participating in the network, it ignores the packet. Otherwise, the EB receiver that transmits the EB packet directly to the neighbors of the rendezvous chain, and the corresponding communication node device participates in the network and runs the rendezvous chain. Characterized in that it includes a rendezvous neighbor EB packet transmission unit that informs the EB priority management unit of the EB transmission module when there is a neighbor, and transmits the EB according to the EB priority, and transmits the EB according to the standard when there is no rendezvous neighbor. do.

In addition, the ERB packet includes rendezvous chain info that determines which channel hopping vector the communication node device has and determines whether to divide the channel hopping vector, a channel index representing a channel currently listening, and a time when the corresponding channel is listening. It is characterized by containing a time on current channel.

In addition, rendezvous chain info includes a rendezvous chain member field indicating whether it belongs to a rendezvous chain, a Channel Hopping Num field indicating the number of channels of a channel hopping vector, and a Channel Tree ID field indicating which channel hopping vector has. It is characterized.

And, using the information contained in the ERB packet, when the communication node device participates in the network after knowing the channel hopping sequence, it is characterized in that it allows the communication node device to directly transmit the EB to the listening channel. .

In addition, before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides and listens to the channel to increase the probability of receiving the EB packet, thereby reducing the time it takes for the communication node device to participate in the network. It features.

In the process of sending and receiving ERB packets, each rendezvous neighbor exchanges channel hopping sequence information, and when a communication node device participates in the network, it immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. It is characterized by being able to participate.

Distributed channel hopping radio listening synchronization method using a TSCH-based rendezvous chain according to the present invention to achieve another object changes channels in a channel hopping vector (ChHV) with a constant period Ch_scanT when the communication node device is turned on. Waiting for a packet in a listening state on the corresponding channel; Transmitting an ERB packet by changing channels in all channel hopping vectors once at a certain period ERB_T; When receiving an ERB packet, it determines whether it is already a rendezvous neighbor, and if it is a rendezvous neighbor, the channel hopping vector If the rendezvous neighbor is not the same ChHV or if the same channel line is used, the ChHV is divided, otherwise, the channel is not divided and added as a rendezvous neighbor; when an EB packet is received, it is synchronized to the network and the rendezvous And immediately transmitting the EB to a channel hopping by a neighbor.

Here, the ERB packet includes rendezvous chain info that determines which channel hopping vector the communication node device has and determines whether to divide the channel hopping vector, a channel index indicating a channel currently listening, and a time of listening to the corresponding channel. It is characterized in that it contains a time on current channel indicating.

And rendezvous chain info includes a rendezvous chain member field indicating whether it belongs to a rendezvous chain, a Channel Hopping Num field indicating the number of channels of a channel hopping vector, and a Channel Tree ID field indicating which channel hopping vector has. It is characterized.

And, using the information contained in the ERB packet, when the communication node device participates in the network after knowing the channel hopping sequence, it is characterized in that it allows the communication node device to directly transmit the EB to the listening channel. .

In addition, before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides and listens to the channel to increase the probability of receiving the EB packet, thereby reducing the time it takes for the communication node device to participate in the network. It features.

In the process of sending and receiving ERB packets, each rendezvous neighbor exchanges channel hopping sequence information, and when a communication node device participates in the network, it immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. It is characterized by being able to participate.

The apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention as described above have the following effects.

First, it is possible to increase the EB reception probability by forming a rendezvous chain to divide and listen to the EB reception channel.

Second, before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides the channels and listens to increase the probability of receiving EB packets.

Third, in the process of exchanging ERB packets, channel hopping sequence information is exchanged between each rendezvous neighbor, and when a communication node device joins the network, the rendezvous neighbor immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. Let them participate.

Fourth, before network participation, nodes exchange information of ERB (Enhanced Rendezvous Beacon) channel vector, channel hopping information, and timing information packet, and determine whether to divide the channel vector in half with the received channel vector information to determine the reception probability. To increase it.

1 is a block diagram of an ERB packet
2 is a block diagram of a channel hopping division module
3 is a configuration diagram showing an example of a rendezvous chain formation
Figure 4 is a block diagram of a distributed channel hopping radio listening synchronization apparatus using a TSCH-based rendezvous chain according to the present invention
5 is a flow chart showing a method of synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention
6 is a flow chart showing a detailed configuration of a method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention

Hereinafter, a preferred embodiment of an apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention will be described in detail as follows.

Features and advantages of the apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention will become apparent through detailed description of each embodiment below.

4 is a block diagram of an apparatus for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention.

The apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention form a rendezvous chain by exchanging ERB (Enhanced Rendezvous Beacon) packets before joining the network, and each communication node device divides and listens to the channel. Thus, it includes a configuration for increasing the probability of receiving an EB packet, reducing the time it takes for the communication node device to participate in the network, and reducing energy consumption.

In the present invention, while transmitting and receiving channel hopping sequence information between each rendezvous neighbor in the process of exchanging ERB packets, when a communication node device participates in the network, the rendezvous neighbor immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. It includes a configuration to enable timely data transmission through rapid network participation by enabling network participation.

The apparatus for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention is a packet that changes a reception channel, manages EB/ERB packets, receives ERBs, and transmits rendezvous neighbor EB packets, as shown in FIG. A receiving module 300, an EB transmission module 400 for changing a transmission channel and managing EB priority, a channel vector management module 100 for managing a channel vector table, and correcting and determining a channel vector, The rendezvous neighbor management module 200, which manages the rendezvous neighbor table, adds and deletes rendezvous neighbors, and manages rendezvous neighbor information according to the channel vector determination result of the channel vector management module 100, and the rendezvous neighbor management module 200 It includes an ERB transmission module 500 that transmits a rendezvous neighbor response according to the addition of a rendezvous neighbor, and manages ERB packet transmission by changing a transmission channel.

Here, the channel vector management module 100 compares the channel vector table management unit 10 with the channel vector table management unit 10 that manages the channel list of the channel sequence vector to be channel-hopping, and the same channel by comparing with the current channel vector when a request for'Send ChHV info' is received. And a channel vector determining unit 11 that determines whether it is a vector line, and a channel vector correcting unit 12 that corrects and stores a channel in the channel vector table when a channel is divided according to the determination of the channel vector determination unit 11.

In addition, the rendezvous neighbor management module 200 determines whether the corresponding rendezvous member currently has when the channel vector management module 100 requests'Add Rendezvous member' and manages the rendezvous neighbor table, and the corresponding A rendezvous neighbor addition unit 22 that determines whether a rendezvous member currently has it and adds it as a rendezvous neighbor (22), a rendezvous neighbor deletion unit (23) that initializes the rendezvous neighbor when the network is disconnected, and the communication node device ID of the rendezvous neighbor And hopping sequence timing information, channel vector line information, and RSSI (received signal strength), and when an ERB packet is received, the ERB transmission module 500 notifies it to share the channel with other communication node devices. Includes (24).

In addition, the ERB transmission module 500 includes a transmission channel change unit 51 that changes a channel to be transmitted, a transmission channel timer unit 52 that determines a period to transmit ERB, and an ERB packet transmission management unit that configures information to be included in the ERB packet. (53) When receiving an ERB packet, if the channel can be divided, a rendezvous neighbor response transmission unit 54 that transmits its own ERB packet to the node that has transmitted the packet to divide the channel, and performs ERB packet transmission. It includes an ERB transmission unit 55.

In addition, the EB transmission module 400 receives a transmission channel change unit 41 that changes a channel to be transmitted, a transmission channel timer unit 42 that determines a period to transmit ERB, and an EB packet. If there is a rendezvous neighbor in the case, it includes an EB priority management unit 43 that manages the priority to transmit EB to the corresponding channel first, and an EB transmission unit 54 that performs EB transmission.

Here, as for the priority, the higher the RSSI (received signal strength), the higher the priority, so that transmission is performed first.

In addition, the packet reception module 300 includes a reception channel change unit 31 for changing a radio reception channel, a reception channel timer unit 32 for managing reception channel timing, and an EB/ERB packet management unit for separating EB and ERB packets. (33) And, in order to determine whether to divide the channel by the received ERB packet, the rendezvous neighbor information management unit 24 of the rendezvous neighbor management module 200 obtains information of the rendezvous member by requesting'Request Rendezvous member Info', and The ERB receiving unit 34 notifying the channel vector determination unit 11 of the vector management module 100, and when an EB packet is received from another communication node device, if it is already participating in the network, the packet is ignored. Otherwise, the rendezvous chain EB receiving unit 35 that directly transmits EB packets to neighbors, and when the corresponding communication node device participates in the network and there is a neighbor forming the rendezvous chain, the EB priority management unit 43 of the EB transmission module 400 is notified. It includes a rendezvous neighbor EB packet transmission unit 36 that transmits the EB according to the EB priority and transmits the EB according to the standard when there is no rendezvous neighbor.

1 is a block diagram of an ERB packet.

The shaded part is the payload of the Mac packet, and contains rendezvous chain info, channel index, and Time on current channel.

First, rendezvous chain info has a rendezvous chain member field indicating whether it belongs to a rendezvous chain, a Channel Hopping Num indicating the number of channels of a channel hopping vector, and a Channel Tree ID field indicating which channel hopping vector has.

It is determined whether to divide the channel hopping vector by determining which channel hopping vector the corresponding communication node device has through each field.

In the payload, the Channel index indicates the currently listening channel, and the Time on current channel indicates the listening time of the corresponding channel.

With this information, when the communication node device participates in the network after knowing the channel hopping sequence of the communication node device, the EB can be transmitted directly to the channel the communication node device is listening to.

2 is a block diagram of a channel hopping division module.

2 shows the channel vectors divided by the channel hopping vector by mod 2 operation, respectively, and the communication node apparatus receives and receives ERB packets and divides and listens to the channel vector currently possessed.

When the rendezvous chain receives an ERB packet transmitted every ERB_T period, it divides the channel if it is listening to the radio in the same channel vector.

If the channel vector of one node belongs to the channel vector of another node, the channel is divided because the other channel vector is already being listened to by another node. Otherwise, only the hopping information and timing information of the corresponding channel are exchanged.

That is, when dividing a channel, it is possible to divide a channel by looking at the channel hopping splitting module as shown in FIG. 2 and having the same channel hopping vector or channel hopping vector of the same line.

In the case of receiving an ERB packet from another communication node device in the channel listening state, if the channel hopping information of another communication node device in the ERB packet is acquired and channel hopping in the same channel vector, the quotient is 0 by dividing the channel hopping vector by mod 2 operation. The channel hopping vector'a' is reconstructed with channels at the channel hopping vector location, and the communication node device receiving the ERB packet has'a' and the remaining channel hopping vector'b' is ERB to the communication node device that sent the ERB packet. When a packet is transmitted, each communication node device has a channel hopping vector divided into two.

In Fig. 2, if the channel vector of the same line (e.g., 8-1ch and 2-3ch) is divided by mod 2 operation, the vector with a small channel vector is divided by the mod 2 operation, and channel hopping is performed with channels at the channel hopping vector position where the quotient is 0. When the vector'a' is reconstructed, the communication node device receiving the ERB packet has'a' and the remaining channel hopping vector'b' is transmitted to the communication node device that sent the ERB packet, and each communication node device is divided into two. It has a true channel hopping vector.

3 is a block diagram showing an example of forming a rendezvous chain.

In step (a), ERB packets have not been sent and received yet. Each communication node device is hopping on a maximum of 16 channels and waiting for EB.

In (b), ERB is exchanged between a and b and c and d, and the channel is divided and hopping.

In (c), since a and d exchanged ERBs and used the same channel hopping vector, we added each other as rendezvous neighbors and divided the channel hopping vectors.

After that, each communication node device transmits the changed channel hopping vector to its neighbors.

In (d), c and f exchange ERBs and divide the channel hopping vector. After that, it informs the rendezvous neighbors with the changed channel hopping vector ERB.

In this state, a, d, c, and f are in the form of dividing 16 channels by 4, and can be a form of listening to one channel by dividing the channel with other communication node devices.

A method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention will be described in detail as follows.

5 is a flow chart showing a method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention, and FIG. 6 is a detail of a method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention. It is a flow chart showing the configuration.

When the communication node device is turned on in areas A and B of FIG. 6, the channel in the channel hopping vector (ChHV) is changed at a constant period of Ch_scanT (eg, 3 seconds), and a packet is waited in a listening state on the corresponding channel.

Regular period ERB_T (ex: 3 seconds) Transmits ERB packets by changing channels in all channel hopping vectors once at a time. When an ERB packet is received, it is determined whether it is a rendezvous neighbor in region C, and if it is a rendezvous neighbor, the channel hopping vector is updated.

If it is not a rendezvous neighbor, the channel can be divided and listened. Therefore, if the same ChHV is used or the same channel line is used, the ChHV is divided. Otherwise, the channel is not divided and added as a rendezvous neighbor.

In the E area, when an EB packet is received, it synchronizes to the network and immediately transmits the EB through a channel hopping by rendezvous neighbors.

Specifically, as shown in FIG. 6, when the communication node device is turned on, the channel in the channel hopping vector (ChHV) is changed at a constant period of Ch_scanT, and a step of waiting for a packet in a listening state is performed on the corresponding channel (S501).

Subsequently, the ERB packet is transmitted by changing channels in all channel hopping vectors once in a certain period ERB_T (S502).

When the ERB packet is received, it is determined whether it is already a rendezvous neighbor, and if it is a rendezvous neighbor, the channel hopping vector is updated (S503).

Subsequently, if the channel is not a rendezvous neighbor, the channel can be divided and listened. Therefore, if the same ChHV is used or the same channel line is used, the ChHV is divided, and if not, the channel is not divided and added as a rendezvous neighbor (S504).

And when an EB packet is received, it synchronizes to the network and immediately transmits the EB to the channel hopping by the rendezvous neighbor (S505).

A method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention will be described in more detail below.

First, the channel vector table management unit 10 of the channel vector management module 100 has a channel list of the channel sequence vector currently channel-hopping, and when a request for'Send ChHV info' is received, the channel vector determination unit 12 It compares with the channel vector of and determines whether it is the same channel vector line.

When a channel is divided by the channel vector correction unit 12, it is modified and stored in the channel vector table.

Then, the channel vector determination unit 11 makes a request for'Add Rendezvous member' to the rendezvous neighbor table management unit 21, and the rendezvous neighbor table management unit 21 determines whether the rendezvous member currently has it, and if not, adds it as a rendezvous neighbor. .

The rendezvous neighbor deletion unit 23 initializes the rendezvous neighbor when the network is disconnected.

The rendezvous neighbor information management unit 24 stores the rendezvous neighbor's communication node device ID, hopping sequence timing information, channel vector line information, and RSSI (received signal strength). When an ERB packet is received, the rendezvous neighbor response transmission unit ( 54), and the channel is shared with other communication node devices.

The EB transmission module 400 and the ERB transmission module 500 each have an independent transmission channel change unit 41, 51 and a transmission channel timer unit 42, 52, and each transmission channel timer unit 42 In (52), the transmission period of EB and ERB is determined, and the transmission channel changing units 41 and 51 change the transmission channel.

The EB priority management unit 43 receives the EB packet ?瑛? In this case, if there is a rendezvous neighbor, priority is managed in order to transmit EB to the corresponding channel first.

As for the priority, the higher the RSSI (received signal strength), the higher the priority, and the transmission is performed first.

The ERB packet transmission management unit 53 configures information to be included in the ERB packet.

When receiving an ERB packet, the Rendezvous Neighbor Response Transmitter 54 transmits its own ERB packet to a node that has transmitted the packet to divide the channel when the channel can be divided.

The packet reception module 300 includes a reception channel change unit 31 for changing a radio reception channel and a timing change, a reception channel timer 32, and an EB/ERB packet management unit 33 for separating EB and ERB packets.

In order to determine whether to divide the channel into the received ERB packet, the ERB receiving unit 34 obtains the information of the rendezvous member by requesting'Request Rendezvous member Info' to the rendezvous neighbor information management unit 24 and informs the channel vector determination unit 11 of this. .

When an EB packet is received from another communication node device, if it is already participating in the network, the packet is ignored. Otherwise, the EB packet is sent directly to the neighbors of the rendezvous chain.

In the rendezvous neighbor EB packet transmission unit 36, when the corresponding communication node device participates in the network and there is a neighbor forming the rendezvous chain, it notifies the EB priority management unit 43 and transmits the EB accordingly, and if there is no rendezvous neighbor, Transmit EB according to the standard.

The apparatus and method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain according to the present invention described above form a rendezvous chain by sending and receiving ERB (Enhanced Rendezvous Beacon) packets before joining the network, and each communication node device It increases the probability of receiving an EB packet by dividing and listening to it to reduce the time it takes for the communication node device to participate in the network, thereby reducing energy consumption.

In addition, in the process of exchanging ERB packets, channel hopping sequence information is exchanged between each rendezvous neighbor, and when a communication node device joins the network, it immediately transmits the EB packet to the channel that the rendezvous neighbor is listening to. By allowing participants to participate, it enables timely data transmission through rapid network participation.

As described above, it will be understood that the present invention is implemented in a modified form without departing from the essential characteristics of the present invention.

Therefore, the specified embodiments should be considered from a descriptive point of view rather than a limiting point of view, and the scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto are included in the present invention. It will have to be interpreted.

100. Channel vector management module
200. Rendezvous neighborhood management module
300. Packet receiving module
400. EB transmission module
500. ERB transmission module

Claims (18)

A packet reception module for changing a reception channel, managing an EB/ERB packet, receiving an ERB, and transmitting an EB packet adjacent to a rendezvous;
An EB transmission module for changing a transmission channel and managing an EB priority;
A channel vector management module that manages a channel vector table and modifies a channel vector table when dividing a channel, and stores it in the channel vector table;
A rendezvous neighbor management module that manages a rendezvous neighbor table according to a channel vector determination result of the channel vector management module, adds and deletes rendezvous neighbors, and manages rendezvous neighbor information;
An apparatus for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain, comprising: an ERB transmission module for managing ERB packet transmission by changing a transmission channel. The method of claim 1, wherein the channel vector management module,
A channel vector table management unit that manages a channel list of a channel sequence vector currently channel-hopping;
A channel vector determination unit that compares the current channel vector with the current channel vector to determine whether it is the same channel vector line when a request for'Send ChHV info' is received;
A distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, comprising: a channel vector correcting unit that corrects when a channel is divided according to the determination of the channel vector determination unit and stores it in a channel vector table. The method of claim 1, wherein the rendezvous neighbor management module,
When the channel vector management module requests'Add Rendezvous member', the rendezvous neighbor table management unit determines whether the rendezvous member currently has it and manages the rendezvous neighbor table;
A rendezvous neighbor addition department that determines whether the rendezvous member currently has it and adds it as a rendezvous neighbor if it does not exist;
A rendezvous neighbor deletion unit that initializes rendezvous neighbors when the network is disconnected,
A distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, comprising: a rendezvous neighbor information management unit that informs the ERB transmission module of the received ERB packet and shares a channel with other communication node devices. The method of claim 3, wherein the rendezvous neighbor information management unit,
A distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, characterized in that storing an ID of a communication node device adjacent to the rendezvous, hopping sequence timing information, channel vector line information, and RSSI (received signal strength). The method of claim 1, wherein the ERB transmission module,
A transmission channel change unit for changing a channel to be transmitted;
A transmission channel timer that determines a period to transmit ERB;
An ERB packet transmission management unit that configures information to be included in the ERB packet;
When receiving an ERB packet, if the channel can be divided, a rendezvous neighbor response transmitter that transmits its own ERB packet to the node that has transmitted the packet to divide the channel;
Distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, comprising: an ERB transmission unit performing ERB packet transmission. The method of claim 1, wherein the EB transmission module,
A transmission channel change unit for changing a channel to be transmitted;
A transmission channel timer that determines a period to transmit ERB;
Receive EB packets?瑛? In this case, if there is a rendezvous neighbor, an EB priority management unit that manages the priority to transmit EB to the corresponding channel first, and
Distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, comprising: an EB transmission unit performing EB transmission. The method of claim 1, wherein the packet receiving module,
A reception channel change unit for changing a radio reception channel,
A reception channel timer unit for managing reception channel timing,
An EB/ERB packet management unit that separates EB and ERB packets,
In order to determine whether to divide the channel with the received ERB packet, the rendezvous neighbor information management unit of the rendezvous neighbor management module obtains the information of the rendezvous member by requesting'Request Rendezvous member Info' and informs the channel vector determination unit of the channel vector management module. ERB receiver,
When receiving an EB packet from another communication node device, if it is already participating in the network, it ignores the packet. Otherwise, an EB receiver that directly transmits the EB packet to the neighbors of the rendezvous chain;
If the corresponding communication node device participates in the network and there is a neighbor forming the rendezvous chain, it notifies the EB priority management department of the EB transmission module and transmits the EB according to the EB priority. If there is no rendezvous neighbor, the EB is transmitted according to the standard. A distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, comprising: a rendezvous neighbor EB packet transmission unit to perform the same. The method of claim 1, wherein the ERB packet,
Rendezvous chain info, which determines which channel hopping vector the communication node device has and decides whether to divide the channel hopping vector
Channel index indicating the channel currently listening,
Distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, characterized in that it contains a Time on current channel indicating a time when a corresponding channel is listening. The method of claim 8, wherein rendezvous chain info,
A rendezvous chain member field indicating whether it belongs to a rendezvous chain, and
A Channel Hopping Num field indicating the number of channels of the channel hopping vector,
A distributed channel hopping radio listening synchronization device using a TSCH-based rendezvous chain, characterized in that it includes a Channel Tree ID field indicating which channel hopping vector has. The method of claim 8, by using information contained in the ERB packet,
Distributed channel hopping radio using TSCH-based rendezvous chain, characterized in that when the communication node device participates in the network after knowing the channel hopping sequence of the corresponding communication node device, it enables the communication node device to directly transmit EB to the listening channel. Listening synchronization device. The method of claim 1, wherein before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides a channel and listens,
A device for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain, characterized by increasing the probability of receiving an EB packet and reducing the time it takes for a communication node device to participate in a network. The method of claim 1, wherein channel hopping sequence information is exchanged between rendezvous neighbors in the process of exchanging ERB packets,
Distributed channel hopping radio using TSCH-based rendezvous chain, characterized in that when a communication node device joins the network, it transmits EB packets directly to the channel that the rendezvous neighbor is listening to so that the rendezvous neighbor can immediately join the network. Listening synchronization device. When the communication node device is turned on, changing a channel in a channel hopping vector (ChHV) at a constant period of Ch_scanT and waiting for a packet in a listening state on the corresponding channel;
Transmitting an ERB packet by changing channels in all channel hopping vectors once in a certain period ERB_T;
Determining whether the ERB packet is already a rendezvous neighbor and, if it is a rendezvous neighbor, updating a channel hopping vector;
Dividing the ChHV when using the same ChHV or using the same channel line when not a rendezvous neighbor, otherwise adding the channel as a rendezvous neighbor without dividing the channel;
When receiving the EB packet, the step of synchronizing to the network and immediately transmitting the EB to the channel hopping by the rendezvous neighbor; Distributed channel hopping radio listening synchronization method using a TSCH-based rendezvous chain comprising a. The method of claim 13, wherein the ERB packet,
Rendezvous chain info, which determines which channel hopping vector the communication node device has and decides whether to divide the channel hopping vector
Channel index indicating the channel currently listening,
A method of synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain, characterized in that it contains a Time on current channel indicating a time of listening to a corresponding channel. The method of claim 14, wherein rendezvous chain info,
A rendezvous chain member field indicating whether it belongs to a rendezvous chain, and
A Channel Hopping Num field indicating the number of channels of the channel hopping vector,
A distributed channel hopping radio listening synchronization method using a TSCH-based rendezvous chain, characterized in that it includes a Channel Tree ID field indicating which channel hopping vector has. The method of claim 14, using the information contained in the ERB packet,
Distributed channel hopping radio using TSCH-based rendezvous chain, characterized in that when the communication node device participates in the network after knowing the channel hopping sequence of the corresponding communication node device, it enables the communication node device to directly transmit EB to the listening channel. How to synchronize listening. The method of claim 13, wherein before joining the network, ERB (Enhanced Rendezvous Beacon) packets are exchanged to form a rendezvous chain, and each communication node device divides and listens to a channel,
A method for synchronizing distributed channel hopping radio listening using a TSCH-based rendezvous chain, characterized by increasing the probability of receiving an EB packet and reducing the time it takes for a communication node device to participate in a network. The method of claim 13, wherein channel hopping sequence information is exchanged between each rendezvous in the process of exchanging ERB packets,
Distributed channel hopping radio using TSCH-based rendezvous chain, characterized in that when a communication node device joins the network, it transmits EB packets directly to the channel that the rendezvous neighbor is listening to so that the rendezvous neighbor can immediately join the network. How to synchronize listening.

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