WO2020063993A1 - Pon network, method and apparatus used for pon network, and robot system - Google Patents

Abstract

A PON network, a method and apparatus used for the PON network, and a robot system. The PON network comprises an OLT and an ONU connected to the OLT, and the PON network and a CAN bus constitutes a PON-CAN bus architecture, wherein the OLT and the ONU comprise a protocol layer of a field bus protocol to enable the OLT to be a network management control master node of the field bus protocol and enable each ONU to be a network management control slave node of the field bus protocol, so as to operate an application based on the field bus protocol; and the OLT as an network management control master device further comprises a first state machine module and a first message bus layer module, and the ONU as an network management control slave device further comprises a second state machine module and a second message bus layer module, wherein the OLT and the ONU mutually subscribe to message topics to implement message communication between the OLT and the ONU.

Description

PON network, method and device for PON network, and robot system

Cross-reference to related applications

This application claims priority from US Provisional Application No. 62/739214, filed on September 29, 2018, the contents of which are incorporated herein by reference.

Technical field

The present disclosure relates to the field of communications, and in particular, to a PON network, a method and device for the PON network, and a robot system.

Background technique

CAN is the abbreviation of Controller Area Network. There is no master-slave data communication in CAN bus. Any node can initiate data communication to any other node, and the CAN bus will not be damaged by a single node. And paralyzed.

With the development of science and technology, the application range of control systems is continuously expanding, and more and more nodes are controlled. For example, robot systems have the characteristics of large amounts of motion, many sensors, and many joints, so they respond to the number of nodes and instructions. The requirements for speed and transmission rate will also become higher and higher. However, the existing CAN bus network cannot meet the corresponding communication requirements in the case of multi-node control transmission.

Summary of the Invention

An object of the present disclosure is to provide a PON network, a method and device for the PON network, and a robot system capable of managing and controlling a communication process between nodes under the PON network.

In order to achieve the above object, a first aspect of an embodiment of the present disclosure provides a PON network, where the PON network includes an optical line terminal OLT, and at least one optical network unit ONU connected to the OLT, and the PON network and a CAN bus are formed. PON-CAN bus architecture;

The OLT includes a protocol layer of a field bus protocol, and the ONU includes a protocol layer of the field bus protocol, so that the OLT serves as a master node for network management and control of the field bus protocol, so that each of the ONU as a network management control slave node of the fieldbus protocol to run applications based on the fieldbus protocol; and,

The OLT as the network management control master device further includes a first state machine module for running a main state machine that performs state operations according to an event occurring on the OLT itself, and an event occurring according to an ONU that accesses the OLT. A slave state machine for performing state operations; a first message bus layer module for providing a message bus server and a first message bus client to support users of the first message bus client in the OLT and the ONU Users of the second message bus client register and subscribe to message topics and publish and receive topic messages;

The ONU as a network management control slave device further includes: a second state machine module for running state operations according to events occurring on the ONU itself and events from the state machine running in the first state machine module. Slave state machine; a second message bus layer module for providing the second message bus client to support users of the second message bus client in the ONU to register and subscribe to message topics, and to publish and receive topic messages ;

Wherein, the OLT and the ONU subscribe to a message topic to realize message communication between the OLT and the ONU.

A second aspect of the embodiments of the present disclosure provides a method for a PON network, which is applied to the PON network described in the first aspect, and the method includes:

Receiving, by the OLT, an access request sent by the at least one ONU;

The OLT returns a configuration request for configuring the ONU to the ONU;

Establishing, by the OLT, a communication connection with the ONU when it receives a message indicating that the configuration is complete returned by the ONU;

The OLT issues a topic message to the ONU based on a communication connection established with the ONU, and / or receives a topic message issued by the ONU.

A third aspect of the embodiments of the present disclosure provides a method for a PON network, which is applied to the PON network described in the first aspect, and the method includes:

At least one ONU in the PON network sends an access request to the OLT;

Receiving, by the ONU, a configuration request for configuring the ONU, and performing configuration according to the configuration request;

The ONU returns a configuration response to the OLT to indicate that the configuration is complete;

Establishing a communication connection between the ONU and the OLT;

The ONU issues a subject message to the OLT based on a communication connection established with the OLT, and / or receives a subject message issued by the OLT.

A fourth aspect of the embodiments of the present disclosure provides a robot system including the PON network described in the first aspect.

A fifth aspect of the embodiments of the present disclosure provides an apparatus for a PON network, the apparatus being configured as an OLT as a network management control master device in the PON network described in the first aspect.

A sixth aspect of the embodiments of the present disclosure provides an apparatus for a PON network, the apparatus being configured as an ONU as a network management control master device in the PON network described in the first aspect.

The above technical solution can at least include the following technical effects:

By setting a first message bus layer module in the OLT and a second message bus layer module in the ONU, the OLT and the ONU can register and exchange message topics with each other through the corresponding message bus layer module via the corresponding transmission network. Subscription, and the release and reception of topic messages, thereby realizing message communication between the OLT and the ONU. In addition, the OLT and the ONU are also provided with a corresponding state machine module and a protocol layer of a fieldbus protocol. In this way, the OLT, which is the master device of the network management control, can interact with the state machine of the ONU of the network management control slave device through the corresponding state machine via the corresponding transmission network. In addition, the protocol layer of the fieldbus protocol can be, for example, the CANopen protocol layer. In this way, the ONU as the slave node of the NMT can run various applications based on CANopen, so that the OLT as the master node of the NMT can use the relevant framework of CANopen. Device profile and application profile manage and configure all the NMT slave nodes on the PON-CAN bus architecture.

Other features and advantages of the present disclosure will be described in detail in the detailed description section that follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific embodiments, the drawings are used to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

FIG. 1 is a schematic diagram of a PON-CAN bus architecture provided by an embodiment of the present disclosure;

2 is a schematic diagram of a PON-CAN bus architecture for deploying MQTT-SN according to an embodiment of the present disclosure;

3 is a schematic structural diagram of an OLT according to an embodiment of the present disclosure;

4 is a schematic structural diagram of an ONU provided by an embodiment of the present disclosure;

5 is a schematic structural diagram of an OLT according to an embodiment of the present disclosure;

6 is a schematic structural diagram of an ONU according to an embodiment of the present disclosure;

7 is a schematic structural diagram of another OLT according to an embodiment of the present disclosure;

8 is a schematic structural diagram of another ONU according to an embodiment of the present disclosure;

9 is a schematic structural diagram of still another OLT according to an embodiment of the present disclosure;

10 is a schematic structural diagram of still another ONU according to an embodiment of the present disclosure;

FIG. 11 is a flowchart of a method for a PON network according to an embodiment of the present disclosure; FIG.

12 is a flowchart of another method for a PON network according to an embodiment of the present disclosure;

13 is a schematic diagram of a working process of a PON network according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of a working process of another PON network provided by an embodiment of the present disclosure.

detailed description

Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the disclosure, and are not intended to limit the disclosure.

In order that those skilled in the art can more easily understand the technical solutions provided by the embodiments of the present disclosure, the PON-CAN bus architecture is described first.

The PON-CAN bus architecture based on passive fiber networking and symmetric couplers and / or asymmetric couplers avoids electromagnetic interference and does not cause bandwidth reduction between levels, which can provide very high bandwidth. With the increasing number of connected nodes, it can also meet the high-speed transmission requirements, and solves the problem of the low CAN bus communication rate and the limited number of node connections.

Figure 1 is a schematic diagram of the PON-CAN bus architecture. As shown in Figure 1, the PON-CAN bus architecture includes an OLT (Optical Line Terminal) 101 and an optical fiber bus connected to the OLT 101. The bus is formed by interconnecting multiple symmetric couplers and / or asymmetric couplers. For example, the optical fiber bus 102 shown in FIG. 1 is formed by interconnecting multiple asymmetric couplers 103. Among them, FIG. 1 is only a schematic illustration of the linear interconnection between the asymmetric couplers. The couplers can use other interconnection methods, or use multiple interconnection methods to form a fiber optic bus. In addition, an ONU (Optical Network Unit) is connected to the optical fiber bus, such as the ONU 104 shown in FIG. 1. Among them, the ONU 104 is used to realize the conversion of the photoelectric signals between the optical fiber bus and the electronically controlled terminal equipment. Furthermore, the total information equipment (not shown in FIG. 1, which can be the upper computer of the robot system, for example) connected to the OLT 101 can implement communication with the terminal equipment through the PON-CAN bus architecture.

In addition, for the PON network in the PON-CAN bus architecture, there are solutions in the related art to deploy MQTT-SN for communication between the OLT and the ONU node, and realize the message bus and publish / subscribe message communication mode between the OLT and the ONU. Among them, Message Queuing Telemetry Transmission (MQTT) is a message transmission protocol based on a client-server architecture that supports a publish / subscribe message communication mode. The sensor version of MQTT (MQTT, Sensor, Networks, MQTT-SN) is an optimized design for various low-cost battery-driven devices and sensors based on MQTT. MQTT-SN has no strict requirements on the underlying network services. Any network can support MQTT-SN as long as it can provide two-way data transmission service between any node and a specific node (gateway). FIG. 2 provides a schematic diagram of a PON-CAN bus architecture for deploying MQTT-SN, including: an MQTT server 201, an MQTT-SN gateway 202, and an optical line terminal connected to the MQTT server through the MQTT-SN gateway 202 ( Optical Line Terminal (OLT) 203, an optical network unit ONU 204 connected to the OLT 203 (shown in FIG. 2 that the OLT and the ONU can be connected through an optical splitter), wherein the MQTT-SN gateway 202 and MQTT The server 201 works at a data link layer, and the OLT 203 and the ONU 204 are provided with MQTT-SN clients.

An embodiment of the present disclosure provides a PON network including an OLT and at least one ONU connected to the OLT, and the PON network and the CAN bus may form a PON-CAN bus architecture;

The OLT shown in FIG. 3 and the ONU shown in FIG. 4. The OLT includes a protocol layer of a field bus protocol, and the ONU includes a protocol layer of the field bus protocol, so that the OLT serves as the field bus. Protocol NMT (Network Management) master node, so that each ONU acts as an NMT slave node of the fieldbus protocol to run applications based on the fieldbus protocol; and the OLT acts as an NMC (Network Management) and (Control, Subsystem, network management control) The main device further includes: a first state machine module, which is used to run a main state machine that performs state operations according to events occurring on the OLT itself; A slave state machine for performing state operations on events; a first message bus layer module for providing a message bus server and a first message bus client to support a user of the first message bus client in the OLT and the ONU The user of the second message bus client in the server registers and subscribes to the message topic and publishes and receives the topic message;

The ONU as a network management control slave device further includes: a second state machine module for running state operations according to events occurring on the ONU itself and events from the state machine running in the first state machine module. Slave state machine; a second message bus layer module for providing the second message bus client to support users of the second message bus client in the ONU to register and subscribe to message topics, and to publish and receive topic messages ;

Wherein, the OLT and the ONU subscribe to a message topic to realize message communication between the OLT and the ONU.

In addition, the OLT includes a first transmission network and the ONU includes a second transmission network. The transmission network may be a G-PON transmission network or an EPON transmission network.

The fieldbus protocol described above may include various types of fieldbuses. Embodiments in which the field bus protocol includes the CANopen protocol and / or includes a virtual CANopen protocol layer to enable the PON-CAN bus architecture to support multiple virtual CAN buses will be described in detail below, wherein each of the virtual CAN buses is used for A plurality of the NMT slave nodes are connected. In addition, in the specific implementation, those skilled in the art should understand that the fieldbus protocol in the present disclosure can also include various types of fieldbus. Therefore, it is also possible to use the CANopen protocol similar to the following embodiments. Layers are ported to OLT and ONU, and other types of fieldbus are ported to OLT and ONU.

The following first describes the case where the protocol layer of the fieldbus protocol is the CANopen protocol layer:

As shown in FIG. 5 and FIG. 6, for the OLT, the CANopen protocol layer of the OLT may include: a first CANopen application module 30, an SDO (Service Data Object) layer 31, and a PDO (Process Data Object). (Object) layer 32, CANopen master adapter 33, network management control client interface 34, and message bus client interface 35; the first CANopen application module 30 includes a configuration management module 301 for configuring each of the NMT slave nodes CANopen-based applications; the CANopen master adapter 33 and the SDO layer 31, the PDO layer 32, the first CANopen application module 30, the network management control client interface 34, and the message bus client The interface 35 is connected; the network management control client interface 34 is used to connect to the network management control server interface in the state machine module of the OLT, and the message bus client interface 35 is used to connect to the message bus layer of the OLT The message bus server interface in the module is connected.

The first state machine module of the OLT further includes: a network management control server interface for supporting the first state machine module 36 to implement between the OLT and the ONU in the first message bus layer module 37 Communication service specifications and service flow tags; a network controller for the first state machine module 36 to perform NMC (Network Management and Control Subsystem) service configuration on the first transmission network 38; message A bus client interface is used to enable the first state machine module to act as a user of a message bus client to register and subscribe to a message topic with the message bus server, and to publish and receive topic messages. It is worth noting that the slave state machine and the master state machine in the first state machine module may use the common message bus client interface and / or a network management control server interface.

The first message bus layer module of the OLT may further include a network management control client interface for supporting the first state machine module to implement the connection between the OLT and the ONU in the first message bus layer module. Communication service specifications and service flow marks; a network adapter connected to the transmission network of the OLT to implement adaptation of the first message bus layer module to the transmission network of the OLT, wherein the network adapter stores the A message transmission path for each message subject between the OLT and the ONU.

The network management control client interface 34 in the CANopen protocol layer of the OLT is used to connect to the network management control server interface in the first state machine module 36 of the OLT to synchronously read the state information of the first state machine module 36 and The state changes and events of the first state machine module 36 are acquired asynchronously, and the message bus client interface 35 is used to connect with the message bus server interface in the first message bus layer module 37 of the OLT. The first CANopen application module 30 can subscribe, publish topic messages, and register message topics in the message bus server through a message bus client interface.

For the ONU, the CANopen protocol layer of the ONU may include: a second CANopen application module 50, an SDO layer 51, a PDO layer 52, a CANopen slave adapter 53, a network management control client interface 54, and a message bus client interface 55;

The second CANopen application module 50 is connected to the CANopen slave adapter 53, the SDO layer 51, and the PDO layer 52, and is configured to run a CANopen-based application. That is, the second CANopen application module 50 includes CANopen protocol-based applications and core object data in the prior art;

The CANopen slave adapter 53 is connected to the SDO layer 51, the PDO layer 52, the network management control client interface 54 and the message bus client interface 55;

The network management control client interface 54 is used to connect to the network management control server interface in the state machine module of the ONU, and the message bus client interface 55 is used to communicate with messages in the message bus layer module of the ONU The bus server interface is connected;

The CANopen slave adapter 53 is configured to adapt the network management control client interface 54 and the message bus client interface 55 to the SDO layer 51, the PDO layer 52, and the CANopen application module 50 to achieve The SDO layer 51, the PDO layer 52, and the CANopen application module 50 may be directly operated on the PON-CAN bus architecture without modification.

The second state machine module 56 of the ONU may further include:

A message bus client interface, configured to support the second state machine module as a user of the second message bus client in the ONU, register and subscribe to a message topic with the message bus server, and publish and receive topic messages;

A network management control server interface for supporting the second state machine module to implement a service specification and a service flow mark of the communication between the OLT and the ONU through the second message bus layer module;

A network controller, configured to perform, by the second state machine module, an NMC service configuration on a second transmission network of the ONU.

The second message bus layer module 57 of the ONU may further include:

Network management control client interface, which is used to support Service Specification and Service Flow Tag in the message bus;

The network adapter is connected to the second transmission network 58 of the ONU and can support remote and local message transmission between the server and the client.

In addition, similar to the CANopen protocol layer above, for other fieldbuses, the protocol layer of the fieldbus protocol in the OLT may also include: a fieldbus application module, a fieldbus communication master adapter, a fieldbus master adapter, and a network management control client. Interface and message bus client interface; wherein the fieldbus communication master adapter is connected to the fieldbus application module and the fieldbus master adapter, and the fieldbus master adapter is connected to the fieldbus application module and the network A management control client interface and the message bus client interface are connected;

The protocol layer of the ONU fieldbus protocol may also include: a fieldbus application module, a fieldbus communication slave adapter, a fieldbus slave adapter, a network management control client interface, and a message bus client interface, where the fieldbus communication slave adapter and the The fieldbus application module and the fieldbus slave adapter are connected, and the fieldbus slave adapter is connected with the fieldbus application module, the network management control client interface, and the message bus client interface. In order to realize the migration of other field buses to the PON network.

In addition, the OLT includes a first transmission network and the ONU includes a second transmission network. The transmission network may be a G-PON transmission network or an EPON transmission network.

In a possible implementation manner, as shown in FIG. 7 and FIG. 8, the first transmission network of the OLT and the second transmission network of the ONU each include a TWDM (Time and Wavelength Division Multiplexed Network, Network) to enable the ONU to switch access between different wavelength channels provided by the OLT.

As shown in FIG. 7, taking NG-PON2 as an example, the first transmission network may include: a TWDM-TC sublayer and a TWDM-PMD sublayer connected to the TWDM-TC sublayer, and the TWDM-TC sublayer The layer is connected to the network controller through the optical network unit management control interface OMCI;

The TWDM-TC sublayer includes: a TWDM-TC function module, a physical layer operation management and maintenance PLOAM module, an AMCC framework (AMCC Framing), an AMCC-PHY adapter (AMCC PHY Adaptation), and a TWDM-TC service adaptation sublayer (TWDM, Service, Adaptation, Sublayer), TWDM-TC, FRAMING sublayer, TWDM-TC, PHY adaptation sublayer;

The TWDM-TC service adaptation sublayer includes: a user data adapter (User Data Adapter), an OMCI adapter, and an encapsulation layer engine (XGEM Engine), and the user data adapter is connected to the TWDM-TC function module;

The TWDM-TC FRAMING sublayer includes: a bandwidth dynamic allocation DBA (Upstream Bandwidth Mgmt & DBA Control) connected to the TWDM-TC function module, and a message header field embedded connected to the TWDM-TC function module and the bandwidth dynamic allocation DBA Embedded (Header Fields) module, PLOAM partition module (PLOAM Partition) connected to the message header field embedded module and physical layer operation management and maintenance PLOAM, encapsulation layer partition connected to the message header field embedded module and the encapsulation layer engine Module (XGEM Partition);

The message header domain embedding module is also connected to the PHY burst timing and configuration file control module in the TWDM-TC PHY adaptation sublayer, and the AMCC-PHY adapter is also connected to the TWDM-PMD sublayer. The physical layer operation management and maintenance PLOAM module, the bandwidth dynamic allocation DBA, and the TWDM-TC function module are also connected to the network controller, respectively.

For specific definitions and functions of the related functional modules of the first transmission network 33 described above, reference may be made to the related definitions of NG-PON2, which will not be described in detail in this disclosure. The first transmission network 33 can respond to the NMC control request of the first state machine module and perform corresponding configuration, thereby supporting related functions of the first state machine module.

In addition, based on the first transmission network 33, the NMC service configuration performed by the first state machine module on the first transmission network through the first network controller may include: managing an optical network unit in the first transmission network Control interface OMCI, physical layer operation management and maintenance PLOAM, and bandwidth dynamic allocation DBA for configuration management.

The master state machine and slave state machine of the first state module are described in detail below.

The master state machine may start the slave state machine in the first state machine module for interaction with the ONU after any ONU connected to the OLT is activated.

In addition, the main state machine may be used to perform state operations according to at least one of the following events:

An NMCM_LINK_UP event used to characterize the activation of the OLT;

An NMCM_LINK_DN event for deactivating the OLT;

An NMCS_LINK_UP event used to characterize a link activation between the OLT and the ONU;

An NMCS_LINK_DN event for deactivating a link between the OLT and the ONU;

An MB_BROKER_UP event that is activated by a message bus server in the first message bus layer module;

An MB_BROKER_DN event for deactivating a message bus server in the first message bus layer module;

An MB_CONNACK event used to characterize connection confirmation between the first state machine module and a message bus server in the first message bus layer module;

An MB_REGISTER event used to characterize that the first state machine module registers a message subject with a message bus server in the first message bus layer module;

An NMCS_LINK_TUNING_BEGIN event used to characterize the ONU connected to the OLT to start switching wavelength channels; an NMCS_LINK_TUNING_END event used to characterize the end of the ONU to access the OLT switched wavelength channels.

In a case where the first transmission network and the second transmission network each include a TWDM network, the master state machine may be configured to start switching a wavelength channel according to an event used to characterize an ONU connected to the OLT, and Perform a state operation on an event characterizing the end of an ONU switching wavelength channel connected to the OLT.

The slave state machine in the first state machine module is configured to perform a state operation according to at least one of the following events:

An NMCS_LINK_UP event used to characterize a link activation between the OLT and the ONU;

An NMCS_LINK_DN event for deactivating a link between the OLT and the ONU;

An NMC_ACCESS_REQ event used to characterize the ONU sending an access request;

An NMC_IDENT_RESP event used to characterize the ONU's identity response response;

An NMC_CONFIG_RESP event used to characterize the ONU's configuration response;

An NMC_STATUS_RESP event used to characterize the ONU's status update response;

An NMCS_LINK_TUNING_BEGIN event used to characterize the ONU connected to the OLT to start switching wavelength channels; an NMCS_LINK_TUNING_END event used to characterize the end of the ONU to access the OLT switched wavelength channels.

In a case where the first transmission network and the second transmission network each include a TWDM network, the master state machine may be configured to start switching a wavelength channel according to an event used to characterize an ONU connected to the OLT, and Perform a state operation on an event characterizing the end of an ONU switching wavelength channel connected to the OLT.

Correspondingly, the slave state machine in the second state machine module may be used to perform state operations according to at least one of the following events:

An NMCS_LINK_UP event used to characterize a link activation between the ONU and the OLT;

An NMCS_LINK_DN event for deactivating a link between the ONU and the OLT;

An MB_CONNACK event used to characterize connection confirmation between the second state machine module and a message bus server in the first message bus layer module;

An MB_REGISTER event used to characterize that the message bus server of the second state machine module in the first message bus layer module registers a message subject;

An NMC_IDENT_REQ event used to indicate that the OLT sends an identity response request to the ONU;

An NMC_CONFIG_REQ event used to indicate that the OLT sends a configuration request to the ONU;

An NMC_STATUS_REQ event used to indicate that the OLT sends a status update request to the ONU;

An NMCS_LINK_TUNING_BEGIN event used to characterize the ONU connected to the OLT to start switching wavelength channels; an NMCS_LINK_TUNING_END event used to characterize the end of the ONU to access the OLT switched wavelength channels.

Optionally, the value of the CPI (Channel Partition Index) of the ONU is 0, so that the ONU can switch access between multiple wavelength channels provided by the same wavelength port of the OLT.

In this way, the manner of setting the CPI value of the ONU in the PON network to 0 supports the switching of the ONU in each wavelength channel provided by the OLT in the PON network. For example, when a certain wavelength channel of the OLT is to be upgraded with software, the OLT can control the ONU on the wavelength channel to perform channel switching, thereby reducing communication interruption time.

In addition, in a case where the first transmission network and the second transmission network both include a TWDM network, the master state machine may be used to characterize an event that is used to characterize the ONU to start switching wavelength channels, and to characterize The event that the ONU switches to the end of the wavelength channel performs state operations.

Optionally, in a case where the first transmission network and the second transmission network both include a TWDM network, the identification information of the OLT includes a wavelength port ID of the OLT and does not include a wavelength channel provided by the OLT ID, the identification information of the ONU includes the wavelength port ID of the OLT and does not include the wavelength channel ID provided by the OLT, so that when the ONU switches between different wavelength channels, the ONU and the ONU connected to the ONU The identification information does not change; and / or, the transmission container T-CONT allocated to the same ONU under the same OLT port, the encapsulation layer port XGEM, Port-ID, and the virtual local area network VLAN remain unchanged.

For example, in the case that TWDM-PON (Time and Wavelength Division Multiplex Passive Optical Network) can have multiple uplink and downlink wavelengths, wavelength port (abbreviated as wlPort) can be used as the identifier of an OLT. Last paragraph. The marking method of the OLT may be shown in Table 1:

Table 1

In this way, referring to Table 1, in a specific OLT rack, the OLT identification method in the PON network may be OLT card / Wavelength port. For example, if the OLT card of the OLT is 1, and the Wavelength port is 2, the flag of the corresponding OLT is 1/2. The Wavelength port may correspond to 1 to 8 wavelength channels (corresponding to 1 to 8 wavelength channel ports, which are represented by OLT CT). Correspondingly, ctPort may be used to mark a wavelength channel port (OLT) corresponding to a wavelength channel on the wavelength port Wavelength port. Among them, in the wavelength channel switching process, the source OLT CT and the destination OLT CT can be marked with sctPort and dctPort, respectively.

In addition, for ONUs under the same wavelength port, the ONUs may be assigned the same ONU ID. That is, the ONU can keep the ONU ID unchanged during the process of switching between different wavelength channels. Correspondingly, the identification method of the ONU may be OLT card / Wavelength port / ONU ID. For example, if the OLT card of the OLT corresponding to the ONU is 1, the Wavelength port is 2, the ID of the ONU is 1, and the wavelength channel is 2, the ONU can be labeled 1/2/1, ctPort = 2. In an embodiment, during the process of ONU switching between different wavelength channels, the OLT assigns the transmission container T-CONT, the encapsulation layer port X-GEM port-ID, and the virtual local area network VLAN to the same ONU under the same wavelength port. constant. If any of the ONU ID, T-CONT, XGEM, Port-ID, and VLAN of the encapsulation layer changes, you need to restart and activate the corresponding ONU.

In a possible implementation manner, the NMC message bus may also be identified through the foregoing OLT identification method. Taking the MQTT-SN message bus as an example, the corresponding NMC message bus may be identified through an OLT card / Wavelength port. Optionally, the MQTT-SN client ID on the message bus may be recorded as a corresponding OLT card / Wavelength port. Similarly, the identifier of the MQTT-SN client on the ONU may be OLT card / Wavelength port / ONU ID.

Where both the first transmission network and the second transmission network include a TWDM network, the OLT can control the ONU to switch access between different wavelength channels if the preset conditions are met. .

Optionally, the message bus server in the first message bus layer module includes an MQTT server, and when the MQTT server is initialized, the first state machine module registers an NMC management control for an ONU that needs to access the OLT in advance. aisle;

The NMC management control channel includes: a first downlink management control channel for downlink multicast messages from the OLT to all ONUs or a specified portion of the ONUs; and a first uplink management control channel for uplink orders from the ONU Broadcast the message to the OLT, and then multicast the message to all ONUs.

For example, if the main state machine in the first state machine module of the OLT receives an MB_REGISTER from an MQTT server or an MQTT-SN gateway connected to the MQTT (characterizing that the second state machine module is in the first The message bus server in the message bus layer module registers the event of the message subject), and the establishment of the OLT and the corresponding ONU transmission channel is completed in the underlying physical transmission network (for example, G-PON's downstream multicast GEM Port-ID and VLAN), The first downlink management control channel becomes effective. As long as the first uplink management control channel receives the MB_REGISTER from the MQTT-SN gateway / MQTT server in the slave state machine in the second state machine module, and establishes a transmission channel from the ONU to the OLT in the underlying physical transmission network (for example, G-PON's uplink T-CONT (Transmission Container, GEM, Port-ID and VLAN) will take effect later.

Optionally, the NMC management control channel further includes:

A second downlink management control channel, configured to downlink a unicast message from the OLT to a designated ONU; and / or,

The second uplink management control channel is used for uplink unicast messages from the ONU to the OLT.

Wherein, the second downlink management control channel only needs to receive MB_REGISTER from the MQTT-SN gateway / MQTT server in the slave state machine of the second state machine module, and establish the physical transmission network from the OLT to the specific The ONU transmission channel (such as G-PON's downstream unicast GEM, Port-ID, and VLAN) becomes effective afterwards. As long as the second uplink management control channel receives the MB_REGISTER from the MQTT-SN gateway / MQTT server in the slave state machine of the second state machine module, and establishes a physical transport network from the ONU to the OLT at the bottom layer Transmission channels (such as G-PON's uplink T-CONT, GEM, Port-ID, and VLAN) will be valid afterwards.

In addition, in a possible implementation manner, the default configuration of the PON network may be that all MQTT-SN control messages and message topics related to network management control are in the above-mentioned downlink multicast GEMPort from OLT to all ONUs. -ID and VLAN, and the upstream T-CONT, GEM, Port-ID and VLAN of the G-PON from the ONU to the OLT. In specific implementation, uplink and downlink transmission channels can also be established separately according to the application requirements of the system.

It is worth noting that in the PON network, in addition to the above-mentioned management control channel, the PUBLISH transmission channel corresponding to other MQTT-SN topic message data can use the topic message data service specification (Service Spec) according to specific message characteristics. And NMC Service to establish G-PON uplink and downlink T-CONT, GEM, Port-ID and VLAN separately for transmission.

For example, the topic publishing message transmission method can be:

When the MQTT server processes the topic registration message issued by the MQTT-SN client of the ONU, it can use the bandwidth description information in the service specification information and the existing multicast, GEM port, and T-CONT usage of the published message, For the current and remaining OLT, GEM port, and T-CONT, determine how to allocate and use multicast, GEM port, and T-CONT. The MQTT server can use OMCI and PLOAM to perform corresponding dynamic configuration on the OLT and ONU, and will dynamically adjust the DBA allocation of the OLT accordingly.

Similarly, when the MQTT server processes the topic subscription of the ONTT's MQTT-SN client to subscribe to the SUBSCRIBE message, it can use the bandwidth description information in the service specification information provided by the ONU that publishes the topic message, and the existing multicast and GEM ports of the subscribed ONU. Usage of the OLT, current and remaining OLT multicast, and GEM ports, determine how to allocate and use multicast and GEM ports. The MQTT server can use OMCI and PLOAM to perform corresponding dynamic configuration on the OLT and the subscribed ONU.

That is, using the PON network can also isolate the transmission channel of the MQTT-SN control message from the transmission channel of the subject message data release to ensure the reliability of the transmission of the MQTT-SN control message. That is, the topic release message is transmitted by the data channel, and all other MQTT-SN control messages are transmitted by the control channel.

The following describes in detail the case where the protocol layer of the fieldbus protocol is the virtual CANopen protocol layer. It is worth noting that in the specific implementation, the OLT can include both the CANopen protocol layer and the virtual CANopen protocol layer. Accordingly, the ONU It is also possible to have both the CANopen protocol layer and the virtual CANopen protocol layer at the same time. The possible combinations are not shown in the figure.

Specifically, as shown in FIG. 9 and FIG. 10, the OLT may further include a virtual CANopen protocol layer, and the ONU further includes a virtual CANopen protocol layer, so that the PON-CAN bus architecture supports multiple virtual CAN buses, where: Each virtual CAN bus is used to connect a plurality of the NMT slave nodes.

As shown in FIG. 9, the virtual CANopen protocol layer of the OLT includes a virtual CANopen application layer 70, a service data object SDO segmentation reorganization manager 71, an SDO layer 72, a process data object PDO layer 73, a CANopen main adapter 74, and network management Control the client interface 75 and the message bus client interface 76;

The virtual CANopen application layer 70 includes:

A master CANopen management module 701, configured to support the OLT as a NMT master node to manage and configure NMT slave nodes on the virtual CAN bus; and

A CANopen management module 702, configured to configure a CANopen application on each of the NMT nodes;

The SDO segmentation and reorganization manager 21 includes an SDO encapsulation layer in the CANopen architecture. The SDO segmentation and reorganization manager 71 connects the virtual CANopen application layer 70 and the SDO layer 72 to read and write objects. In the process of the dictionary, the object data with a length exceeding a predetermined value is divided and transmitted during transmission, and the divided object data is reassembled into the original object data during reception, and the predetermined value may be, for example, 4 bytes;

The CANopen master adapter 74 is connected to the SDO layer 72, the PDO layer 73, the virtual CANopen application layer 70, the network management control client interface 75, and the message bus client interface 76;

The network management control client interface 75 is configured to connect to a network management control server interface in a first state machine module of the OLT, and the message bus client interface is used to connect to a first message bus layer module of the OLT. The message bus server interface is connected.

As shown in FIG. 10, the virtual CANopen protocol layer of the ONU includes a CANopen application module 81, an SDO layer 82, a PDO layer 83, a CANopen slave adapter 84, a network management control client interface, and a message bus client interface;

The CANopen application module 81 is connected to the CANopen slave adapter 84, the SDO layer 82, and the PDO layer 83, and is configured to run a CANopen-based application;

The CANopen slave adapter 84 is connected to the SDO layer 82, the PDO layer 83, the network management control client interface, and the message bus client interface;

The network management control client interface is used to connect with a network management control server interface in the state machine module of the ONU, and the message bus client interface is used to connect to a message bus server in the message bus layer module of the ONU The interface is connected.

Optionally, each ONU serves as a network management control NMC slave node of the OLT, and each ONU serves as a network management NMT slave node under the CANopen protocol control of the OLT, wherein the PON network uses The static configuration maps the NMC node number of each ONU to the NMT node number.

Optionally, each of the virtual CAN buses has identification information, and the identification information of each of the virtual CAN buses and a node number of an NMT node on the virtual CAN bus form a virtual CANopen on the PON-CAN network structure. NMT node number;

The OLT is configured to identify, for each ONU, the ONU as an NMT slave node, identification information of the virtual CAN bus where the NMT slave node is located, the identification information and the node number of the NMT node and the NMC of the ONU. The mapping table between the node numbers is written into the object dictionary of the ONU.

For example, based on the CANopen NMT node number, the embodiment of the present disclosure can also add a Virtual CAN bus ID as the identification information of the virtual bus in addition to the CANopen node number, and let the Virtual CAN bus ID and the CANopen NMT node number together constitute CANopen over PON-CAN bus architecture Virtual CANopen NMT node number. The Virtual CANopen NMT node number is used to support multiple Virtual CAN buses. Each Virtual CAN bus supports a maximum of 127 nodes (compared to the traditional CAN bus supporting 127 nodes, which has universal significance and greater versatility). All ONUs on the PON-CAN bus can run various applications of CANopen. And can achieve isolation between different Virtual CAN bus.

Optionally, the message subject registered by the OLT and the ONU includes identification information of a corresponding virtual CAN bus, and each message on the virtual CAN bus is transmitted in a message subject having the identification information of the virtual CAN bus. To isolate different virtual CAN buses.

Optionally, the main CANopen management module is specifically configured to implement management and configuration of the virtual CAN bus through the following operations:

Generating a corresponding configuration file according to each of the virtual CANopen NMT node numbers;

Determine whether the newly generated configuration file is the same as the last generated configuration file, if not, update the last generated configuration file and the time stamp of the configuration file according to the newly generated file;

For each virtual CAN bus that has at least one NMT slave node, for each NMT slave node on the virtual CAN bus, start the state machine instance corresponding to the CANopen management module and the NMT slave node on the virtual CAN bus, and Transmitting the updated configuration file and the configuration file time stamp as parameters to the state machine instance to configure the NMT slave node on the virtual CAN bus according to the newly generated configuration file, and complete all NMT on the virtual CAN bus After the slave node is configured, all NMT slave nodes on the virtual CAN bus are started.

Based on any of the PON networks described in the above embodiments, the following aspects of the PON-CAN bus architecture composed of the PON network and the CAN bus are described below:

In the first aspect, the network management control NMC message subject in the PON-CAN bus architecture;

In the second aspect, the message format of the PON-CAN bus architecture;

The third aspect is the physical transmission network of the PON-CAN bus architecture;

The fourth aspect is the object dictionary of the PON-CAN bus architecture;

The fifth aspect is the security of the PON-CAN bus architecture.

Specifically, for the first aspect, the subject of the network management control NMC message in the PON-CAN bus architecture can be shown in Table 2 below, where NMC-M is a network management control master device (such as an OLT) and NMC-S is a network Management control slave device (such as ONU):

Table 2

For the second aspect, first, the basic format of the message header of the PON-CAN bus architecture can be shown in Table 3 below:

table 3

As shown in Table 3, the common parts of the basic header format of different message types include:

Byte 2 (D7-D4): can be reserved for future use;

Byte 2 (D3): Checksum indicator Checksum Indicator: indicates whether the message header has an optional checksum;

Byte 2 (D2): Packet length indicator Packet: Indicates whether the message header has an optional packet length;

Byte 2 (D1): Header Length Indicator Indicator: indicates whether the message header has an optional header length;

Byte 2 (D0): next header indicator Next header: indicates whether there is an optional stackable next header in the header;

Byte 3-4: Header Length: The optional header length. If there is, it is the current length of the message header (including the possible options), for the convenience of quickly jumping to the possible stacked Next Header, or the message body. In addition, you can also use this length to add extra padding bytes, so that the message header or the entire message length is an integer multiple of 4 bytes or 2 bytes;

Byte 5-6: Packet length Packet Length: The optional Packet Length. If there is, it includes the total length of the entire message header and message body;

Byte 7-8: Checksum: Optional Checksum. If so, including the checksum from the current message header and the message body, the same calculation method as TCP is used;

In addition, the type-specific part of the basic format of the message header (different message types may have different fields) is Byte9.

In addition, as shown in Table 4, the first byte of the basic format of the message header of the PON-CAN bus architecture may include a 4-bit message header dispatch type (Header Dispatch Type) and a 4-bit message header subtype. (Header SubType).

The message header dispatch type is used as the category information of the message header. In a possible implementation manner, it can be shown in Table 4:

Table 4

Further, a message header dispatch type and a message header subtype may define a message header type (Header Type) together, as shown in Table 5 below. The message header type may be:

table 5

Based on the basic format of the message header of the PON-CAN bus architecture, the following describes the basic format of the NMC message header of the PON-CAN bus architecture. Among them, the NMC message of the PON-CAN bus architecture is the core module message of the PON-CAN bus architecture. The NMC message of the PON-CAN bus architecture in the embodiment of the present disclosure can be shown in Table 6 below:

Table 6

The definition of the NMC message type can be shown in Table 7 below:

Table 7

As shown in Table 7, common parts of the NMC message header format for different message types include:

Byte 2 (D1): Destination NMC node ID indicator Destination NMC Node ID Indicator: It is used to indicate whether there is an optional target NMC node ID in the message header. When the subject of the message to be published is only the sole subscriber of the receiving node, the Field can be omitted;

Byte 2 (D0): Source NMC node ID indicator Source NMC Node ID Indicator: It indicates whether the message header has an optional source NMC node ID. When there is only the publisher of the sending node in the subject of the message, or it is not required In the message of the node number of the sending node, this field can be omitted;

Byte 3-4 (D10-D0): Destination NMC node ID; Destination NMC node ID;

Byte 5-6 (D10-D0): Source NMC node ID Source NMC Node ID.

According to the specific NMC message type, the NMC message header starts from Byte 7 (assuming Destination NMC Node ID Indicator = 1 and Source NMC Node ID Indicator = 1) are fields related to a specific message type. The sender of the message can use the optional Packet Length, Header Length, and Checksum in the PON-CAN bus architecture message header to construct a corresponding variable-length message that supports transmission error detection according to the specific message type, usage environment, etc.

For the third aspect, it is worth noting that the PON-CAN bus architecture is not limited to a specific physical transmission network. In specific implementation, the embodiments of the present disclosure can be configured using the OMCI configuration model in ITU-T G.988, and can be directly applied to various G-PON network systems. In addition, using the definition of Annex, OMCI, and Ethernet PON Systems in ITU-T G.984.3, the implementation method of the embodiment of the present disclosure is also applicable to various EPON network systems. For example, under the PON-CAN bus architecture, according to the needs of the actual system and the scale of the internal nodes of the system, a physical transmission network based on G-PON and NG-PON2 can be selected.

For the fourth aspect, the PON-CAN bus architecture can follow the CANopen protocol, adopt the same object dictionary definition as CANopen, and add related content to PON-CAN, including:

PON-CAN subject message data service specifications;

PON-CAN NMC related subject message data service specifications;

Message bus related configuration;

CANopen over PON-CAN related subject message data service specifications;

CANopen NMT node number and PON-CAN NMC node number mapping table.

For example, in a possible implementation manner, the CANopen object dictionary used by the PON network includes static data types and complex data types defined by the CANopen protocol, and newly added complex data types; For quantitative description of the service specifications of the subject message data, including at least one of the following descriptions: a description of the number of entries used to characterize the subject message, a description of the version number, and a distribution distribution model (Distribution) Description of Publish Mode, description of fixed bandwidth (Fixed Bandwidth), description of guaranteed bandwidth (Assured Bandwidth), description of maximum bandwidth (Maxband).

Table 8 is a specific illustration of the newly added complex data types:

Table 8

Optionally, in the embodiment of the present disclosure, the definition of the service specifications of the subject message data can be placed in the dictionary object data types (Object Data Types) and reserved for the manufacturer-specific complex data types (Manufacturer Specific Data Types). The 0050 address in the address segment 0040-005F is shown in Table 9 below. The storage address can also be adjusted according to the specific conditions of the application system.

Table 9

For another example, the subject message data service specification (Service Spec) can be stored in the address 1101 in the address segment 1000-11F of the communication profile section of the object dictionary. This address can be adjusted according to the specific conditions of the application system.

The SDO subject message data service specification (Service Spec) is stored at the address 1100 in the address segment 1000-11FF of the communication dictionary profile of the object dictionary. Among them, for simplicity, the embodiment of the present disclosure can provide CANopen over PON-CAN. All SDO channels define a unified subject message data service specification (ServiceSpec).

The PDO subject message data service specification (ServiceSpec) can be stored in the 5A00-5BFF address range in the address segment 2000-5FFF of the manufacturer-specific functionality part of the object dictionary. Similarly, for the sake of simplicity, the embodiment of the present disclosure defines an independent topic message data service specification for each TPDO channel in CANopen and PON-CAN. In this way, the index of the topic message data service specification of the nth TPDO channel is 5A00. + n (1 <= n <= 512).

For the security of the PON-CAN bus architecture in the fifth aspect, in the embodiment of the present disclosure, the PON-CAN bus architecture can use the OLT / ONU authentication, data encryption, and integrity protection mechanisms provided by the PON. For the message bus, the message bus can be used to provide Server / client authentication, message encryption and integrity protection mechanisms to ensure the security of the bus architecture.

An embodiment of the present disclosure further provides an OLT configured as the OLT as a network management control master device in the PON network.

An embodiment of the present disclosure also provides a method for a PON network. The execution subject of the method may be, for example, the above-mentioned OLT. The PON network includes: an optical line terminal OLT as a master device for network management and control, and a slave for network management control At least one optical network unit ONU of the device, the PON network may form a PON-CAN bus architecture with a CAN bus, as shown in FIG. 11, the method includes:

S901. An OLT in a PON network receives an access request sent by at least one ONU.

S902. The OLT returns a configuration request for configuring the ONU to the ONU.

S903. The OLT establishes a communication connection with the ONU when it receives a message indicating that the configuration is completed and returned by the ONU.

For example, the OLT and the ONU may establish a communication connection through a three-way handshake.

S904. The OLT issues a topic message to the ONU based on the communication connection established with the ONU, and / or receives the topic message issued by the ONU.

Optionally, the first transmission network included in the OLT and the second transmission network included in the ONU are both time division and wavelength division multiplexed TWDM networks, and the method further includes:

When the preset conditions are met, the OLT controls the ONU to switch access between different wavelength channels.

The preset condition includes at least one of the following conditions:

The OLT CT of the first wavelength port fails. For example, after an OLT CT (OLT Channel Channel Terminal) of the first wavelength port fails, the ONU of the wavelength channel is switched to Other wavelength channels, or, after the ONU line card fails, switch the ONU to another wavelength channel;

The board of the ONU fails;

The OLT CT of the first wavelength port enters a software upgrade state.

In addition to the above-mentioned preset conditions, in an embodiment, the ONU switching access between different wavelength channels provided by the OLT under the condition that the preset conditions are met includes:

Perform load sharing of the wavelength channel, and if the total load value of the first wavelength channel is greater than a preset threshold, switch the ONU from the first wavelength channel to a second wavelength channel, wherein the The total load value plus the load value of the ONU is less than the preset threshold; and / or

If the sum of the total load values of the plurality of wavelength channels is still less than the preset threshold, all ONUs of the plurality of wavelength channels are switched to the first wavelength channel, where the first wavelength channel is the foregoing Any one of multiple wavelength channels.

For example, the ONU in the higher-loaded wavelength channel can be switched to the lower-loaded wavelength channel according to the load capacity of the wavelength channel, so as to achieve the effect of controlling the load capacity and capacity of each wavelength channel. In another embodiment, according to the idle degree of the PON network, when the PON network is relatively idle (for example, at night), multiple ONUs can be switched to the same wavelength channel, thereby reducing the energy consumption of the OLT.

Optionally, the method further includes:

The main state machine in the first state machine module of the OLT responds to a message bus server activation event in the first message bus layer module, and a state operation corresponding to the event occurs. The state operation includes at least: Sending a message bus connection request to the message bus server;

The main state machine in the first state machine module of the OLT responds to a connection confirmation event with a message bus server in the first message bus layer module, and a state operation corresponding to the event occurs;

The main state machine in the first state machine module of the OLT is in response to registering a message subject event with a message bus server in the first message bus layer module, and a state operation corresponding to the event occurs;

When the OLT receives a message indicating that the ONU completes the NMC configuration, it triggers an event indicating the activation of the OLT, and the main state machine in the first state machine module of the OLT responds to the event, A status operation corresponding to the event occurred;

When receiving the message bus server connection request sent by the ONU, the OLT triggers an event that is used to characterize the activation of the link between the ONU and the OLT. The first state machine module of the OLT In response to the event, the main state machine occurs, and a state operation corresponding to the event occurs.

Optionally, the method further includes:

When receiving the message bus server connection request sent by the ONU, the OLT triggers an event that is used to characterize the activation of the link between the ONU and the OLT. The first state machine module of the OLT The slave state machine responds to the event, and a state operation corresponding to the event occurs;

When the OLT receives the message of the message bus server connection request sent by the ONU, the OLT triggers an event for characterizing the access request issued by the ONU, and the slave state machine in the first state machine module of the OLT In response to the event, a state operation corresponding to the event occurs, and the state operation includes at least: sending an identity response request to the ONU;

When the OLT receives the identity response response sent by the ONU, an event for characterizing the ONU to respond to the identity response is triggered, and the slave state machine in the first state machine module of the OLT responds to the event, A state operation corresponding to the event occurs, the state operation includes at least: sending a configuration request to the ONU for configuring a slave state machine in the second state machine module of the ONU;

When the OLT receives the configuration response sent by the ONU, an event for triggering the configuration response of the ONU is triggered. The slave state machine in the first state machine module of the OLT responds to the event, and a corresponding event occurs. For the state operation of the event, the state operation includes at least: sending a status update request to the ONU to implement the slave state machine in the first state machine module of the OLT and the second state machine module in the ONU Interactions between state machines;

When the OLT receives a status update response sent by the ONU, an event for triggering the status update of the ONU is triggered, and a slave state machine in the first state machine module of the OLT occurs in response to the event. Action corresponding to the state of the event.

An embodiment of the present disclosure also provides an ONU configured as an ONU that is a network management control slave device in the PON network.

An embodiment of the present disclosure also provides a method for a PON network. The execution subject of the method may be, for example, the above-mentioned ONU. The PON network includes an optical line terminal OLT as a master device for network management and control, and a slave device for network management and control At least one optical network unit ONU of the device, the PON network may form a PON-CAN bus architecture with a CAN bus, as shown in FIG. 12, the method includes:

S1001. At least one ONU in the PON network sends an access request to the OLT.

S1002. The ONU receives a configuration request for configuring the ONU, and performs configuration according to the configuration request.

S1003. The ONU returns a configuration response to the OLT to indicate that the configuration is complete.

S1004. The ONU establishes a communication connection with the OLT.

S1005. The ONU issues a topic message to the OLT based on the communication connection established with the OLT, and / or receives a topic message issued by the OLT.

Optionally, the method further includes:

Upon receiving the NMC configuration instruction sent by the OLT, the ONU triggers an event for characterizing a link activation between the ONU and the OLT, and the slave in the second state machine module of the ONU The state machine responds to an event of a registered message subject, and a state operation corresponding to the event occurs;

When the ONU receives the message of the message bus server connection confirmation sent by the OLT, it triggers an event for characterizing the connection confirmation of the second state machine module with the message bus server in the first message bus layer module , The slave state machine in the second state machine module of the ONU responds to the event, and a state operation corresponding to the event occurs;

The slave state machine in the second state machine module of the ONU responds to the message bus server registering the message subject event in the first message bus layer module, and a state operation corresponding to the event occurs;

When the ONU receives the identity response request sent by the OLT, it triggers an event used to characterize the OLT sending an identity response request to the ONU, and the slave state machine in the second state machine module of the ONU responds At the event, a status operation corresponding to the event occurs, and the status operation includes at least: sending an identity response response to the OLT;

When the ONU receives a configuration request sent by the OLT, it triggers an event used to characterize that the OLT sends a configuration request to the ONU, and a slave state machine in the second state machine module of the ONU responds to the An event, a state operation corresponding to the event occurs, the state operation includes at least: sending a configuration response to the OLT;

The ONU receives a status update request sent by the OLT, and triggers an event for characterizing the OLT to send a status update request to the ONU. The slave state machine in the second state machine module of the ONU responds to In this event, a state operation corresponding to the event occurs. The state operation includes at least sending a status update response to the OLT to implement a slave state machine in the first state machine module of the OLT and a second state machine in the ONU. Interaction between slave state machines in the state machine module.

Combining the method steps on both sides of the OLT and ONU, Fig. 13 and Fig. 14 (Fig. 14 can be performed based on Fig. 13) separately show the working process of the PON network, which will not be repeated here.

An embodiment of the present disclosure further provides a robot system, which includes the PON network provided in the above embodiments.

As shown in Figure 1, the upper computer in the robot system can be used as the OLT in the PON-CAN bus architecture. The median computer system, power management system, lower computer control system, servo system of each limb joint, and corresponding terminal equipment of each limb joint can be located in the next-level network connected to the optical fiber bus of the PON-CAN bus architecture.

With the robot system provided by the embodiment of the present disclosure, the control devices and terminals of the robot system can be connected through the PON-CAN bus architecture. Due to the existence of the virtual bus, the nodes of the PON-CAN bus architecture are highly expandable, so they can be based on the system. Actually, multiple robot topology terminals need to be connected to solve the problem of node limitation in the existing robot bus system, and it can ensure that the high-speed transmission requirements can be met under the condition of increasing nodes.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all belong to the protection scope of the present disclosure.

In addition, it should be noted that the specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure provides various possible features. The combination is not explained separately.

In addition, various embodiments of the present disclosure can also be arbitrarily combined, as long as it does not violate the idea of the present disclosure, it should also be regarded as the content disclosed in the present disclosure.

Claims (32)

1. A PON network, characterized in that the PON network includes an optical line terminal OLT and at least one optical network unit ONU connected to the OLT, and the PON network and a CAN bus form a PON-CAN bus architecture;

   The OLT includes a protocol layer of a field bus protocol, and the ONU includes a protocol layer of the field bus protocol, so that the OLT serves as a master node for network management and control of the field bus protocol, so that each of the ONU as a network management control slave node of the fieldbus protocol to run applications based on the fieldbus protocol; and,

   The OLT as a network management control master device further includes: a first state machine module for running a main state machine that performs state operations according to an event occurring on the OLT itself, and an event occurring according to an ONU connected to the OLT A slave state machine for performing state operations; a first message bus layer module for providing a message bus server and a first message bus client to support users of the first message bus client in the OLT and the ONU Users of the second message bus client register and subscribe to message topics and publish and receive topic messages;

   The ONU as a network management control slave device further includes: a second state machine module for running state operations according to events occurring on the ONU itself and events from the state machine running in the first state machine module. Slave state machine; a second message bus layer module for providing the second message bus client to support users of the second message bus client in the ONU to register and subscribe to message topics, and to publish and receive topic messages ;

   Wherein, the OLT and the ONU subscribe to a message topic to realize message communication between the OLT and the ONU.
2. The PON network according to claim 1, wherein the OLT further comprises a first transmission network, and the ONU further comprises a second transmission network;

   The first transmission network and the second transmission network include time division and wavelength division multiplexed TWDM networks to enable the ONU to switch access between different wavelength channels provided by the OLT.
3. The PON network according to claim 2, wherein the first state machine module comprises:

   A first message bus client interface for supporting the first state machine module as a user of the first message bus client in the OLT to register and subscribe to a message topic with the message bus server, and to publish and receive topic messages ;

   A first network management control server interface for supporting the first state machine module to implement a service specification and a service flow mark for communication between the OLT and the ONU through the first message bus layer module;

   A first network controller, configured to perform network management, control, and NMC service configuration on the first transmission network by the first state machine module.
4. The PON network according to claim 2, wherein the second state machine module comprises:

   A second message bus client interface for supporting the second state machine module as a user of the second message bus client in the ONU, registering and subscribing to message topics and publishing and receiving topics with the message bus server News

   A second network management control server interface for supporting the second state machine module to implement service specifications and service flow tags for communication between the OLT and the ONU through the second message bus layer module;

   A second network controller, configured to perform, by the second state machine module, an NMC service configuration on the second transmission network.
5. The PON network according to claim 2, wherein the first message bus layer module comprises:

   A network management control client interface for supporting the first state machine module to implement a service specification and a service flow mark of the communication between the OLT and the ONU through the first message bus layer module;

   A network adapter connected to the first transmission network to implement adaptation of the first message bus layer module to the first transmission network, wherein the network adapter stores each of the data between the OLT and the ONU Message delivery path for a message subject.
6. The PON network according to claim 3, wherein the slave state machine in the first state machine module and the master state machine share the first message bus client interface and / or the first A network management control server interface.
7. The PON network according to claim 3, wherein the first state machine module performs NMC service configuration on the first transmission network through a first network controller, comprising:

   Performing configuration management on the optical network unit management control interface OMCI, physical layer operation management and maintenance PLOAM, and bandwidth dynamic allocation DBA in the first transmission network.
8. The PON network according to any one of claims 2-7, wherein the master state machine is configured to start a slave in the first state machine module after any ONU connected to the OLT is activated. A state machine for interacting with the ONU.
9. The PON network according to any one of claims 2-7, wherein the master state machine is configured to perform a state operation according to at least one of the following events:

   An event used to characterize the activation of the OLT;

   An event used to characterize the OLT deactivation;

   An event for characterizing a link activation between the OLT and the ONU;

   An event for deactivating a link between the OLT and the ONU;

   An event used to characterize an ONU that accesses the OLT to switch wavelength channels;

   An event used to characterize the end of an ONU switching wavelength channel accessing the OLT;

   An event for characterizing a message bus server activation in the first message bus layer module;

   An event for deactivating a message bus server in the first message bus layer module;

   An event for characterizing connection confirmation between the first state machine module and a message bus server in the first message bus layer module;

   An event used to characterize that the message bus server of the first state machine module in the first message bus layer module registers a message subject.
10. The PON network according to any one of claims 2-7, wherein the slave state machine in the first state machine module is configured to perform a state operation according to at least one of the following events:

    An event for characterizing a link activation between the OLT and the ONU;

    An event for deactivating a link between the OLT and the ONU;

    An event used to characterize an ONU that accesses the OLT to switch wavelength channels;

    An event used to characterize the end of an ONU switching wavelength channel accessing the OLT;

    An event used to characterize the ONU sending an access request;

    An event used to characterize the ONU's identity response response;

    An event used to characterize the ONU's configuration response;

    An event used to characterize the ONU's status update response.
11. The PON network according to any one of claims 2-7, wherein the slave state machine in the second state machine module is configured to perform a state operation according to at least one of the following events:

    An event for characterizing a link activation between the ONU and the OLT;

    An event for deactivating a link between the ONU and the OLT;

    An event used to characterize that the ONU starts to switch wavelength channels;

    An event used to characterize the end of the ONU switching wavelength channel;

    An event for characterizing connection confirmation between the second state machine module and a message bus server in the first message bus layer module;

    An event used to characterize that the second state machine module registers a message subject with a message bus server in the first message bus layer module;

    An event used to characterize that the OLT sends an identity response request to the ONU;

    An event used to indicate that the OLT sends a configuration request to the ONU;

    An event used to indicate that the OLT sends a status update request to the ONU.
12. The PON network according to any one of claims 2-7, wherein a value of a channel partition index CPI of the ONU is 0, so that the ONU can provide a plurality of channels provided by the same wavelength port of the OLT. Switch access between wavelength channels.
13. The PON network according to claim 12, wherein the identification information of the OLT includes a wavelength port ID of the OLT and does not include a wavelength channel ID provided by the OLT, and the identification information of the ONU includes the OLT The wavelength port ID does not include the wavelength channel ID provided by the OLT, so that when the ONU switches between different wavelength channels, the identification information of the ONU and the OLT connected to the ONU does not change; and / or,

    The transmission container T-CONT allocated to the same ONU under the same wavelength port of the OLT, the XGEM port-ID of the encapsulation layer port, and the VLAN of the virtual local area network remain unchanged.
14. The PON network according to claim 1, wherein the protocol layer of the fieldbus protocol comprises a CANopen protocol layer.
15. The PON network according to claim 1, wherein the protocol layer of the fieldbus protocol comprises a virtual CANopen protocol layer,

    The virtual CANopen protocol layer included in the OLT and the virtual CANopen protocol layer included in the ONU are used to enable the PON-CAN bus architecture to support multiple virtual CAN buses, wherein each of the virtual CAN buses is For connecting a plurality of the NMT slave nodes.
16. The PON network according to claim 15, wherein the virtual CANopen protocol layer of the OLT comprises a virtual CANopen application layer, a service data object SDO segmentation reorganization manager, an SDO layer, a process data object PDO layer, and a CANopen master adapter , Network management control client interface, message bus client interface;

    The virtual CANopen application layer includes:

    A master CANopen management module for supporting the OLT as an NMT master node to manage and configure NMT slave nodes on the virtual CAN bus; and

    A CANopen management module, configured to configure a CANopen application on each of the NMT nodes;

    The SDO segmentation and reorganization manager includes an SDO encapsulation layer in the CANopen architecture. The SDO segmentation and reorganization manager connects the virtual CANopen application layer and the SDO layer, and is used for reading and writing the object dictionary. , When transmitting the object data with a length exceeding a predetermined value, the object data is divided and transmitted, and when receiving, the object data that is divided and transmitted is reassembled into the original object data;

    The CANopen master adapter is connected to the SDO layer, the PDO layer, the virtual CANopen application layer, the network management control client interface, and the message bus client interface;

    The network management control client interface is used to connect to a network management control server interface in a state machine module of the OLT, and the message bus client interface is used to connect to a message bus server in a message bus layer module of the OLT. The interface is connected.
17. The PON network according to claim 15, wherein the virtual CANopen protocol layer of the ONU includes a CANopen application module, an SDO layer, a PDO layer, a CANopen slave adapter, a network management control client interface, and a message bus client interface;

    The CANopen application module is connected to the CANopen slave adapter, the SDO layer, and the PDO layer, and is configured to run a CANopen-based application;

    The CANopen slave adapter is connected to the SDO layer, the PDO layer, the network management control client interface, and the message bus client interface;

    The network management control client interface is used to connect with a network management control server interface in the state machine module of the ONU, and the message bus client interface is used to connect to a message bus server in the message bus layer module of the ONU The interface is connected.
18. The PON network according to any one of claims 15-17, wherein each of the ONUs serves as a network management control NMC slave node of the OLT, and each of the ONUs serves as a CANopen protocol control of the OLT Network management NMT slave node under the network;

    The PON network uses a static configuration to map the NMC node number of each ONU to the NMT node number.
19. The PON network according to any one of claims 15-17, wherein each of the virtual CAN buses has identification information;

    The identification information of each virtual CAN bus and the node number of the NMT node on the virtual CAN bus constitute a virtual CANopen NMT node number on the PON-CAN network structure;

    The OLT is configured to identify, for each ONU, the ONU as an NMT slave node, identification information of the virtual CAN bus where the NMT slave node is located, the identification information and the node number of the NMT node and the NMC of the ONU. The mapping table between the node numbers is written into the object dictionary of the ONU.
20. The PON network according to any one of claims 15-17, wherein the message subject registered by the OLT and the ONU includes identification information of a corresponding virtual CAN bus, and each of the virtual CAN buses The message is transmitted in a message subject with identification information of the virtual CAN bus to isolate different virtual CAN buses.
21. The PON network according to claim 19, wherein the main CANopen management module is specifically configured to implement management and configuration of the virtual CAN bus through the following operations:

    Generating a corresponding configuration file according to each of the virtual CANopen NMT node numbers;

    Determine whether the newly generated configuration file is the same as the last generated configuration file, if not, update the last generated configuration file and the time stamp of the configuration file according to the newly generated file;

    For each virtual CAN bus that has at least one NMT slave node, for each NMT slave node on the virtual CAN bus, start the state machine instance corresponding to the CANopen management module and the NMT slave node on the virtual CAN bus, and Transmitting the updated configuration file and the configuration file time stamp as parameters to the state machine instance to configure the NMT slave node on the virtual CAN bus according to the newly generated configuration file, and complete all NMT on the virtual CAN bus After the slave node is configured, all NMT slave nodes on the virtual CAN bus are started.
22. A method for a PON network, which is applied to the PON network according to any one of claims 1 to 21, the method includes:

    Receiving, by the OLT, an access request sent by the at least one ONU;

    The OLT returns a configuration request for configuring the ONU to the ONU;

    Establishing, by the OLT, a communication connection with the ONU when it receives a message indicating that the configuration is complete returned by the ONU;

    The OLT issues a topic message to the ONU based on a communication connection established with the ONU, and / or receives a topic message issued by the ONU.
23. The method according to claim 22, wherein the first transmission network included in the OLT and the second transmission network included in the ONU are both time division and wavelength division multiplexed TWDM networks, and the method further comprises:

    When the preset conditions are met, the OLT controls the ONU to switch access between different wavelength channels.
24. The method according to claim 23, wherein the preset condition comprises at least one of the following conditions:

    The port OLT CT of the first wavelength channel of the first wavelength port fails;

    The board of the ONU fails;

    The OLT CT of the first wavelength port enters a software upgrade state.
25. The method according to claim 23, wherein the ONU switches access between different wavelength channels provided by the OLT if a preset condition is met, including:

    ONU switches to a relatively idle wavelength channel to increase load capacity or capacity sharing; and / or

    When the PON network is idle or at night, the ONUs dispersed in multiple wavelength channels are switched to a wavelength channel whose number of ONUs is less than a predetermined threshold.
26. The method according to claim 22, further comprising:

    The main state machine in the first state machine module of the OLT responds to a message bus server activation event in the first message bus layer module, and a state operation corresponding to the event occurs. The state operation includes at least: Sending a message bus connection request to the message bus server;

    The main state machine in the first state machine module of the OLT responds to a connection confirmation event with a message bus server in the first message bus layer module, and a state operation corresponding to the event occurs;

    The main state machine in the first state machine module of the OLT is in response to registering a message subject event with a message bus server in the first message bus layer module, and a state operation corresponding to the event occurs;

    When the OLT receives a message indicating that the ONU completes the NMC configuration, it triggers an event indicating the activation of the OLT, and the main state machine in the first state machine module of the OLT responds to the event, A status operation corresponding to the event occurred;

    When receiving the message bus server connection request sent by the ONU, the OLT triggers an event that is used to characterize the activation of the link between the ONU and the OLT. The first state machine module of the OLT In response to the event, the main state machine occurs, and a state operation corresponding to the event occurs.
27. The method according to claim 22, further comprising:

    When receiving the message bus server connection request sent by the ONU, the OLT triggers an event that is used to characterize the activation of the link between the ONU and the OLT. The first state machine module of the OLT The slave state machine responds to the event, and a state operation corresponding to the event occurs;

    When the OLT receives the message of the message bus server connection request sent by the ONU, the OLT triggers an event for characterizing the access request issued by the ONU, and the slave state machine in the first state machine module of the OLT In response to the event, a state operation corresponding to the event occurs, and the state operation includes at least: sending an identity response request to the ONU;

    When the OLT receives the identity response response sent by the ONU, an event for characterizing the ONU to respond to the identity response is triggered, and the slave state machine in the first state machine module of the OLT responds to the event, A state operation corresponding to the event occurs, the state operation includes at least: sending a configuration request to the ONU for configuring a slave state machine in the second state machine module of the ONU;

    When the OLT receives the configuration response sent by the ONU, an event for triggering the configuration response of the ONU is triggered. The slave state machine in the first state machine module of the OLT responds to the event, and a corresponding event occurs. For the state operation of the event, the state operation includes at least: sending a status update request to the ONU to implement the slave state machine in the first state machine module of the OLT and the second state machine module in the ONU Interactions between state machines;

    When the OLT receives a status update response sent by the ONU, an event for triggering the status update of the ONU is triggered, and a slave state machine in the first state machine module of the OLT occurs in response to the event. Action corresponding to the state of the event.
28. A method for a PON network, which is applied to the PON network according to any one of claims 1 to 21, the method includes:

    At least one ONU in the PON network sends an access request to the OLT;

    Receiving, by the ONU, a configuration request for configuring the ONU, and performing configuration according to the configuration request;

    The ONU returns a configuration response to the OLT to indicate that the configuration is complete;

    Establishing a communication connection between the ONU and the OLT;

    The ONU issues a subject message to the OLT based on a communication connection established with the OLT, and / or receives a subject message issued by the OLT.
29. The method according to claim 28, further comprising:

    Upon receiving the NMC configuration instruction sent by the OLT, the ONU triggers an event for characterizing a link activation between the ONU and the OLT, and the slave in the second state machine module of the ONU The state machine responds to an event of a registered message subject, and a state operation corresponding to the event occurs;

    When the ONU receives the message of the message bus server connection confirmation sent by the OLT, it triggers an event for characterizing the connection confirmation of the second state machine module with the message bus server in the first message bus layer module , The slave state machine in the second state machine module of the ONU responds to the event, and a state operation corresponding to the event occurs;

    The slave state machine in the second state machine module of the ONU responds to the message bus server registering the message subject event in the first message bus layer module, and a state operation corresponding to the event occurs;

    When the ONU receives the identity response request sent by the OLT, it triggers an event used to characterize the OLT sending an identity response request to the ONU, and the slave state machine in the second state machine module of the ONU responds At the event, a status operation corresponding to the event occurs, and the status operation includes at least: sending an identity response response to the OLT;

    When the ONU receives a configuration request sent by the OLT, it triggers an event for characterizing that the OLT sends a configuration request to the ONU, and the slave state machine in the second state machine module of the ONU responds to the An event, a state operation corresponding to the event occurs, the state operation includes at least: sending a configuration response to the OLT;

    The ONU receives a status update request sent by the OLT, and triggers an event for characterizing the OLT to send a status update request to the ONU. The slave state machine in the second state machine module of the ONU responds to In this event, a state operation corresponding to the event occurs. The state operation includes at least sending a status update response to the OLT to implement a slave state machine in the first state machine module of the OLT and a second state machine in the ONU. Interaction between slave state machines in the state machine module.
30. A robot system, characterized in that the robot system comprises the PON network according to any one of claims 1-21.
31. A device for a PON network, characterized in that the device is configured as an OLT as a network management control master device in the PON network according to any one of claims 1-21.
32. A device for a PON network, characterized in that the device is configured as an ONU as a network management control master device in the PON network according to any one of claims 1-21.

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