WO2024045815A1

WO2024045815A1 - Registration method, related device and optical communication system

Info

Publication number: WO2024045815A1
Application number: PCT/CN2023/102552
Authority: WO
Inventors: 袁贺; 赵湘楠; 曾小飞
Original assignee: 华为技术有限公司
Priority date: 2022-08-31
Filing date: 2023-06-27
Publication date: 2024-03-07
Also published as: CN117676392A

Abstract

Disclosed in the embodiments of the present application are a registration method, a related device and an optical communication system, which are used for reducing the bandwidth and the degree of time delay jitter in the registration of a communication node with a central office device. The method comprises: a first communication node receiving a registration request message from a second communication node, wherein the registration request message is used for measuring a first round-trip time (RTT) between a central office device and the second communication node; the first communication node carrying the registration request message in a target time slot of an uplink data stream, wherein the target time slot is indicated by the central office device; and the first communication node sending the uplink data stream to the central office device.

Description

Registration method, related equipment and optical communication system

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 31, 2022, with application number 202211058795.2 and the application title "A registration method, related equipment and optical communication system", the entire content of which is incorporated by reference incorporated in this application.

Technical field

The present application relates to the field of communication technology, and in particular, to a registration method, related equipment and an optical communication system.

Background technique

The ring network includes a first central office (CO) device and a second CO device. N communication nodes are connected in sequence between the first CO device and the second CO device, where N is any positive integer greater than 1. The first CO device, N communication nodes and the second CO device form a ring network.

The ring network includes multiple registered communication nodes. The multiple registered communication nodes use time division multiple access (TDMA) to communicate with the CO device (the CO device can be the first CO device or the second CO device). ) sends uplink traffic. That is, each registered communication node sends uplink services to the CO device within the time slot allocated by the CO device, and it is ensured that there will be no conflict between the uplink services of each registered communication node. If the ring network connection has a communication node to be registered (such as communication node N), the CO device completes the registration of the communication node N to be registered within the window time. When the communication node N is successfully registered, the CO device can provide communication Node N allocates time slots for sending uplink services.

However, during the window opening time, each registered communication node cannot use the window opening time to send uplink services, resulting in a waste of bandwidth during the window opening time.

Contents of the invention

Embodiments of the present application provide a registration method, related equipment and an optical communication system, which can reduce the bandwidth and delay jitter of communication nodes registering to central office equipment.

The first aspect of the embodiment of the present application provides a registration method. The method includes: a first communication node receives a registration request message from a second communication node, and the registration request message is used to measure central office equipment and the second communication node. The first round-trip communication delay between communication nodes is RTT; the first communication node carries the registration request message on the target time slot of the upstream data stream, and the target time slot is indicated by the central office device; the The first communication node sends the uplink data stream to the central office device.

Using the method shown in this aspect, the central office device can receive the registration request message from the second communication node in a window-free manner. In the process of sending the registration request message to the central office device, there is no need to occupy independent time slot resources, which reduces bandwidth waste and improves the utilization efficiency of time slot resources. Moreover, since the first RTT is measured based on a window-free method, timely transmission of the uplink service of the registered first communication node is ensured, and delay jitter is reduced.

Based on the first aspect, in an optional implementation manner, the first communication node sends an uplink Before the data flow, the method further includes: the first communication node measuring a second RTT between the first communication node and the second communication node according to the registration request message; the first communication node The second RTT is carried on the target time slot.

Using this implementation, the first communication node measures the second RTT between the first communication node and the second communication node, and the first communication node directly sends the second RTT to the central device, so that the central office device determines the second RTT according to the second RTT. Obtaining the first RTT effectively improves the timeliness of the central office equipment obtaining the first RTT.

Based on the first aspect, in an optional implementation manner, before the first communication node receives the registration request message from the second communication node, the method further includes: the first communication node sends a message to the second communication node. The node sends a registration trigger message, and the registration trigger message is used to instruct the second communication node to send the registration request message.

With this implementation, the first communication node triggers the second communication node to send a registration request message through the registration trigger message, which improves the success rate of registering the second communication device.

Based on the first aspect, in an optional implementation manner, before the first communication node sends a registration trigger message to the second communication node, the method further includes: the first communication node receives a message from the center The first downlink data flow of the central office device; the first communication node copies the first downlink data flow to obtain the second downlink data flow; the first communication node sends a registration trigger message to the second communication node The method includes: the first communication node sending the second downlink data stream to the second communication node, the second downlink data stream including a target downlink data frame, and the target downlink data frame is used to carry the registration trigger. information.

In this implementation manner, the first communication node sends a target downlink data frame to the second communication node, so that the second communication node sends a registration request message according to the target downlink data frame. It can be seen that the central office device does not need to send the registration trigger message by broadcasting, but directly sends the registration trigger message to the second communication node through the target downlink data frame, which ensures the success rate of the second communication node receiving the registration trigger message.

Based on the first aspect, in an optional implementation manner, the registration trigger message is a target superframe number carried by the target downlink data frame.

Using this implementation, the first communication node instructs the second communication node to send a registration request message through the target superframe number of the target downlink data frame. When the second communication node detects the target superframe number, it directly sends the registration request message to the first communication node. The node sends the registration request message to ensure the success rate of the second communication node receiving the registration trigger message.

Based on the first aspect, in an optional implementation manner, the first communication node measuring the second RTT between the first communication node and the second communication node according to the registration request message includes: The first communication node determines a first time. The first time is the time when the first communication node sends a registration trigger message to the second communication node. The registration trigger message is used to instruct the second communication node to send The registration request message; the first communication node determines a second time, and the second time is the time when the first communication node receives the registration request message; the first communication node determines the second time The difference between and the first time is the second RTT.

Based on the first aspect, in an optional implementation manner, before the first communication node sends a registration trigger message to the second communication node, the method further includes: the first communication node receives a message from the center The third downlink data stream of the central office device; the first communication node copies the third downlink data stream to obtain a fourth downlink data stream; the first communication node adds the registration in the fourth downlink data stream Trigger message to obtain the fifth downstream data stream; the first communication The node sending a registration trigger message to the second communication node includes: the first communication node sending the fifth downlink data stream to the second communication node.

In this implementation manner, the first communication node sends the fifth downlink data stream to the second communication node, so that the second communication node sends the registration request message according to the fifth downlink data stream. It can be seen that the central office equipment does not need to send the registration trigger message by broadcasting, but directly sends the registration trigger message to the second communication node through the fifth downlink data flow, which ensures the success rate of the second communication node receiving the registration trigger message.

Based on the first aspect, in an optional implementation manner, the first communication node measuring the second RTT between the first communication node and the second communication node according to the registration request message includes: The first communication node determines a third time, which is the time when the first communication node sends the first measurement message to the second communication node; the first communication node determines a fourth time, and the third time is the time when the first communication node sends the first measurement message to the second communication node. The fourth time is the time when the first communication node receives the second measurement message from the second communication node; the first communication node determines that the difference between the fourth time and the third time is the Describe the second RTT.

Using this implementation, the first communication node measures the second RTT based on the first measurement message and the second measurement message, which effectively improves the accuracy of measuring the second RTT.

Based on the first aspect, in an optional implementation manner, the first receiving port RX of the first communication node is connected to the central office device, and the second RX of the first communication node is connected to the second communication node. Node connection, before the first communication node receives the registration request message from the second communication node, the method further includes: the first communication node, in the first RX and the second RX, transfers the The second RX is switched to a receiving port for receiving the registration request message.

Using this implementation method, the success rate of the first communication node sending a registration request message to the central office device and sending the uplink data stream to the second communication node can be successfully guaranteed.

Based on the first aspect, in an optional implementation manner, the first communication node switches the second RX to receive the registration request message among the first RX and the second RX. Before the port, the method further includes: the first communication node detecting that the signal quality received via the first RX is better than the signal quality received via the second RX.

Using this implementation, the first communication node selects the central office device for registration based on signal quality, which improves the success rate of registration of the first communication node.

Based on the first aspect, in an optional implementation manner, the first communication node switches the second RX to receive the registration request message among the first RX and the second RX. Before the port, the method further includes: the first communication node detects a failure event in the optical signal received via the second RX.

Using this implementation, when the first communication node determines that a fault event occurs in the optical signal received via the second RX, the first communication node chooses to register with the central office device connected to the first RX, thereby improving the efficiency of the first communication The success rate of node registration.

Based on the first aspect, in an optional implementation, the method is applied to an optical communication system, and the optical communication system includes the central office device and a plurality of communication nodes connected to the central office device in sequence; The first communication node and the second communication node are two different communication nodes among the plurality of communication nodes, and the first communication node is connected between the central office equipment and the second communication node .

The second aspect of the embodiment of the present application provides a registration method. The method includes: a central office device receiving an uplink data stream from a first communication node; Bearer registration request message, wherein the registration request message comes from the second communication node, and the target time slot is indicated by the central office device; The central office device measures a first round-trip communication delay RTT between the central office device and the second communication node according to the registration request message.

For description of the beneficial effects in this aspect, please refer to the first aspect, and details will not be repeated.

Based on the second aspect, in an optional implementation manner, after the central office device receives the uplink data stream from the first communication node, the method further includes: the central office device obtains the data flow on the target time slot. The second RTT between the first communication node and the second communication node of the bearer; the central office device measures the third RTT between the central office device and the second communication node according to the registration request message. A round-trip communication delay RTT includes: the central office device measuring the first RTT according to the second RTT and the registration request message.

Based on the second aspect, in an optional implementation manner, before the central office device measures the first RTT according to the second RTT and the registration request message, the method further includes: the central office device Obtain a third RTT, which is the RTT between the central office device and the first communication node; the central office device measures the first RTT according to the second RTT and the registration request message. The RTT includes: the central office device determines that the sum of the second RTT and the third RTT is the first RTT.

Based on the second aspect, in an optional implementation manner, the central office device obtaining the third RTT includes: the central office device obtaining the identity of the first communication node on which the uplink data stream has been carried; The central office device obtains the corresponding third RTT according to the identification of the first communication node.

The third aspect of the embodiment of the present application provides a registration method. The method includes: a second communication node receives a registration trigger message from a first communication node; the second communication node sends a message to the third communication node according to the registration trigger message. A communication node sends a registration request message, and the registration request message is used to measure the first round-trip communication delay RTT between the central office device and the second communication node.

Based on the third aspect, in an optional implementation manner, the second communication node receiving the registration trigger message from the first communication node includes: the second communication node receiving a second downlink message from the first communication node. data stream, the second downlink data stream includes a target downlink data frame, and the registration trigger message is a target superframe number carried by the target downlink data frame.

Based on the third aspect, in an optional implementation manner, the second communication node receiving the registration trigger message from the first communication node includes: the second communication node receiving the fifth downlink message from the first communication node. Data stream, the fifth downlink data stream has carried the registration trigger message.

The fourth aspect of the embodiment of the present application provides a communication node. The communication node includes a transceiver and a service processor. The transceiver is connected to the service processor; the transceiver is used to receive a message from another communication node. Registration request message, the registration request message is used to measure the first round-trip communication delay RTT between the central office equipment and the other communication node; the service processor is used to carry all the data on the target time slot of the uplink data stream. In the registration request message, the target time slot is the time slot indicated by the central office device for the communication node; the transceiver is also used to send the uplink data stream to the central office device.

For description of the beneficial effects of this application, please refer to the first aspect, and details will not be repeated.

The fifth aspect of the embodiment of the present application provides a central office device. The central office device includes a transceiver and a service processor. The transceiver is connected to the service processor; the transceiver is used to receive the first communication from The node’s upstream data flow;

The service processor is configured to obtain the registration request message carried on the target time slot of the uplink data stream, wherein, The registration request message comes from the second communication node, the target time slot is the time slot indicated by the central office device for the first communication node, and the service processor is also configured to measure the time slot according to the registration request message. The first round-trip communication time delay RTT between the central office equipment and the second communication node.

The sixth aspect of the embodiment of the present application provides a communication node. The communication node includes a transceiver and a service processor. The transceiver is connected to the service processor; the transceiver is used to receive a message from another communication node. Register trigger message;

The service processor is configured to send a registration request message to the other communication node according to the registration trigger message, and the registration request message is used to measure the first round-trip communication time between the central office device and the second communication node. Extended RTT.

The seventh aspect of the embodiment of the present application provides an optical communication system. The optical communication system includes a central office device, a first communication node and a second communication node that are connected in sequence; the first communication node is used to send a signal to the third communication node. The second communication node sends a registration trigger message; the second communication node is used to send a registration request message to the first communication node according to the registration trigger message; the first communication node is used to send a registration request message in the target time slot of the uplink data stream. The registration request message is carried on the mobile phone, and the target time slot is the time slot indicated by the central office device to the first communication node; the first communication node is used to send the uplink data to the central office device. stream; the central office device is used to obtain the registration request message that has been carried by the uplink data stream; the central office device is used to measure the central office device and the second communication node according to the registration request message. The first round-trip communication delay is RTT.

The eighth aspect of the embodiments of the present application provides a readable storage medium. Execution instructions are stored in the readable storage medium. When at least one service processor executes the execution instructions, any one of the first to third aspects is executed. method shown.

Description of drawings

Figure 1a is an example of the structure of a ring network;

Figure 1b is a structural example diagram of a ring network provided by an embodiment of the present application;

Figure 2a is an example diagram of the execution steps of ONU registration to OLT provided by existing solutions;

Figure 2b is an example diagram of the transmission cycle indicated by the OLT;

Figure 2c is a comparison example of the transmission cycle indicated by the OLT;

Figure 3 is a flow chart of the first steps of the registration method provided by the embodiment of the present application;

Figure 4 is an example structural diagram of a downlink data frame provided by the embodiment of the present application;

Figure 5 is an example structural diagram of the first embodiment of the ONU provided by the embodiment of the present application;

Figure 6a is a timing diagram for the OLT to obtain the third RTT provided by the embodiment of the present application;

Figure 6b is a timing diagram for the OLT to obtain the second RTT provided by the embodiment of the present application;

Figure 7 is a second step flow chart of the registration method provided by the embodiment of the present application;

Figure 8 is a third step flow chart of the registration method provided by the embodiment of the present application;

Figure 9 is a first structural example diagram of ONU1 provided by the embodiment of the present application;

Figure 10 is a flow chart of the fourth step of the registration method provided by the embodiment of the present application;

Figure 11 is a flow chart of the fifth step of the registration method provided by the embodiment of the present application;

Figure 12 is a second structural example diagram of ONU1 provided by the embodiment of the present application;

Figure 13 is a structural example diagram of a communication device provided by an embodiment of the present application;

Figure 14 is an example diagram of a dual-ring network structure provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of this application.

Figure 1a is an example of the structure of a ring network. The ring network includes a first CO device 101, a second CO device 102, and N communication nodes sequentially connected between the first CO device 101 and the second CO device 102. The first CO device 101 is also connected to the second CO device 102 . N shown in this example is any positive integer greater than 1. The first CO device 101 and the second CO device 102 are control centers and signal aggregation processing nodes, such as issuing commands to control various communication nodes. Each communication node needs to feed back a signal to the first CO device 101 or the second CO device 102 . Taking the first CO device 101 as an example, the first CO device 101 is used to implement data transmission between each communication node and the upper layer network. Specifically, the first CO device 101 can act as an intermediary between each communication node and the upper layer network. The first CO device 101 can forward the downlink traffic received from the upper layer network to the corresponding communication node and receive the downlink traffic received from each communication node. The uplink traffic is forwarded to the upper layer network. Among them, the upper-layer network can be the Internet, public switched telephone network (PSTN), interactive Internet television (IPTV), voice over Internet protocol (VoIP) and other networks.

The advantage of using a ring network is that once a failure occurs between two communication nodes, it will not affect the normal communication of the ring network. For example, if a fault occurs between communication node 2 and communication node 3, communication node 2 does not need to communicate through the link between communication node 2 and communication node 3. The communication node 2 communicates normally with the communication node 1, and the communication node 1 communicates normally with the first CO device 101, so as to ensure normal communication between the communication node 2 and the first CO device 101. The communication node 3 communicates with the communication node N, and the communication node N communicates with the second CO device 102 to ensure normal communication between the communication node 3 and the second CO device 102. Since the first CO device 101 and the second CO device 102 are connected, the service that the communication node 2 needs to send to the second CO device 102 can be forwarded by the first CO device 101. Similarly, the communication node 3 needs to send it to the first CO device 102. The services of the CO device 101 can be forwarded by the second CO device 102.

This example does not limit the application scenarios of ring networking. For example, ring networking is used in optical transport networks.

transport network (OTN), industrial control, data backhaul, data center and monitoring center, etc. There are no specific restrictions. For the description of the ring networking structure, please refer to the description in Figure 1, and the details will not be repeated. This example also does not limit the device type of each device included in the ring network. For example, the CO device can be a base station controller (BSC), and the communication node can be a base transciver station (BTS). ). For another example, the CO device can be a server, and the communication node can be a switch. For another example, the CO device can be a baseband processing unit (building baseband unit, BBU), and the communication node can be a radio remote unit. RRU), as another example, the CO device can be a server, and the communication node can be a terminal device such as a surveillance camera. As shown in Figure 1b, the CO equipment included in the ring network may be an optical line terminal (OLT), and the communication node may be an optical network unit (ONU). The ring networking applied in this application can be seen as shown in Figure 1b, where Figure 1b is a structural example diagram of the ring networking provided by the embodiment of this application. The ring network includes OLT1, OLT2 and N ONUs connected between OLT1 and OLT2 in sequence. Among them, OLT1 and OLT2 may be two communication boards included in the same OLT. For another example, OLT1 and OLT2 may be two independent OLTs that have a connection relationship. In the ring network shown in this embodiment, any two adjacent ONUs do not need to be connected through an optical splitter, and there is no need to connect the OLT1 to the adjacent ONU (that is, ONU1 shown in Figure 1b) through an optical splitter. , OLT2 and the adjacent ONU (i.e. ONU3) do not need to be connected through an optical splitter. For example, taking ONU1 as an example, ONU1 has two communication ports. One communication port of ONU1 is directly connected to OLT1 through an optical fiber, and the other communication port of ONU1 is directly connected to ONU2 through an optical fiber. When ONU1 is directly connected to the first OLT1, the communication delay is effectively reduced, and because the ring network does not require optical splitters, the deployment difficulty of the ring network is reduced, the deployment efficiency is improved, and the insertion time of the ring network is reduced. damage. In this embodiment, the value of N is 2 as an example, and the specific value of N is not limited. Taking OLT1, N ONUs and OLT2 to form a ring network as an example, there is no limitation. For example, OLT1, N ONUs and OLT2 can also form a chain network or a tree network.

Based on the ring network shown in Figure 1b, the registration method provided in this embodiment is used to register the ONU in the ring network to the OLT, so that the OLT can allocate time slots for transmitting uplink services to the ONU. In order to better understand the method provided by the embodiment of the present application, the process of how an ONU in a ring network provided by the existing solution is registered to the OLT is first described below in conjunction with Figures 2a and 2b: Figure 2a is Existing solutions provide an example diagram of the execution steps for registering an ONU to an OLT. Figure 2b is an example diagram of the transmission cycle indicated by the OLT.

Step 201: OLT1 receives a registration request message from the ONU to be registered in the first transmission cycle.

Referring to Figure 2b, this example shows that both ONU1 and ONU2 included in the ring network have been successfully registered to OLT1. The first transmission cycle 220 indicated by OLT1 includes time slot 221 and time slot 222, where time slot 221 is the time slot indicated by OLT1 for ONU1, so that ONU1 sends uplink services to OLT1 in time slot 221. Time slot 222 is the time slot indicated by OLT1 to ONU2, so that ONU2 sends uplink services to OLT1 in time slot 222.

In order for OLT1 to enable the ONUs to be registered in the ring network to successfully register to OLT1, the OLT allocates a discovery time window 223 in the first transmission cycle 220. This example uses three time slots: 221, 222, and discovery time windows 223. The timing sequence between them is not limited, and this embodiment does not limit the duration of the discovery time window 223. During the duration of the discovery time window 223, any registered ONU included in the ring network cannot occupy the discovery time window 223 to send uplink services to OLT1. OLT1 indicates the first transmission cycle to each ONU through dynamic bandwidth assignment (DBA).

It can be understood that the ONU3 to be registered detects the discovery time window 223 of the first transmission cycle, and the ONU3 to be registered carries a registration request message in the discovery time window 223. The registration request message is used by ONU3 to request registration to OLT1. The registration request message is the serial number (SN) of ONU3. Registered ONU2 carries the uplink service of ONU2 in time slot 222. The registered ONU1 carries the uplink service of ONU1 in this time slot 221.

Step 202: OLT1 sends the first measurement message to the ONU to be registered.

When OLT1 detects the registration request message carried by the discovery time window 223, OLT1 sends the first measurement message to ONU3 to be registered.

Step 203: OLT1 receives the second measurement message from the ONU to be registered.

Continuing to refer to Figure 2b, the second transmission cycle 230 indicated by OLT1 includes the time slot 231 of ONU1 and the time slot 232 of ONU2. For specific description, please refer to the description of time slot 221 and time slot 222 shown in Figure 2a. The details will not be given. Repeat. The second transmission period 230 also includes a ranging time window 233. During the duration of the ranging time window 233, any registered ONU included in the ring network cannot occupy the ranging time window 233 to send uplink services to OLT1. The first measurement message shown in this example is used to indicate the measurement Time window 233.

It can be understood that the ONU3 to be registered detects the ranging time window 233 included in the second transmission period 230 according to the first measurement message, and the ONU3 to be registered carries the second measurement message in the ranging time window 233. Registered ONU2 carries the uplink service of ONU2 in time slot 232. The registered ONU1 carries the uplink service of ONU1 in this time slot 231.

Step 204: OLT1 obtains the target round-trip communication delay according to the first measurement message and the second measurement message.

Specifically, OLT1 can calculate the round-trip time (RTT) between OLT1 and ONU3 based on the sending time when OLT1 sends the first measurement message and the receiving time when OLT1 receives the second measurement message. The RTT between OLT1 and ONU3 is equal to the difference between the receiving time when OLT1 receives the second measurement message and the sending time when OLT1 sends the first measurement message.

Step 205: OLT1 allocates time slots to ONU3.

When OLT1 obtains the RTT between OLT1 and ONU3, OLT1 can allocate time slots for ONU3 to transmit ONU3's uplink services based on the RTT between OLT1 and ONU3, so that ONU3 can successfully register with OLT1. Continue to see As shown in Figure 2b, when OLT1 determines that ONU3 has successfully registered with OLT1, OLT1 allocates a third transmission cycle 240, where the third transmission cycle 240 includes the time slot 241 of ONU1, the time slot 242 of ONU2 and the time slot of ONU3 243. It can be understood that ONU3 carries the uplink service of ONU3 in the time slot 243 indicated by OLT1. Time slot 241, time slot 242 and time slot 243 do not overlap in time, thereby ensuring that there will be no transmission conflict between uplink services sent by each ONU registered to OLT1.

It can be understood that in the process of registering the ONU to be registered to the OLT as shown in the existing solution, the time window indicated by the OLT (such as the discovery time window or ranging time window) cannot be used for the transmission of the uplink services of the registered ONU. Therefore, the time window indicated by the OLT brings a waste of bandwidth.

See Figure 2c, which is a comparison example of the transmission cycle indicated by the OLT. Time t1, time t2, time t3, time t4, time t5, time t6, time t7 and time t8 shown in Figure 2c are on the time axis, increasing in sequence. If OLT1 does not need to allocate a time window (such as the discovery time window or ranging time window shown in Figure 2b), then OLT1 is the time slot indicated by ONU1 and ONU2. See time slot allocation example 1, OLT1 within a transmission cycle, is ONU1 is allocated a time slot 251. The starting time of this time slot 251 is time t1 and the end time is time t2. OLT1 allocates time slot 252 to ONU2. The starting time of this time slot 252 is time t2 and the end time is t3. In the next transmission cycle, OLT1 allocates time slot 253 to ONU1. The starting time of this time slot 253 is time t3 and the end time is time t4. The OLT allocates time slot 254 to ONU2. The starting time of this time slot 254 is time t4 and the end time is t6.

If OLT1 needs to allocate a time window (such as the discovery time window or ranging time window shown in Figure 2b), OLT1 is the time slot indicated by ONU1 and ONU2. See time slot allocation example 2, OLT1 within a transmission cycle, is ONU1 is allocated a time slot 261. The start time of this time slot 261 is time t1 and the end time is time t2 (the same as the start and end time of time slot 251 of ONU1 shown in time slot example 1). OLT1 allocates time slot 262 to ONU2. The starting time of this time slot 262 is time t2 and the end time is t3 (the same as the starting and ending time of time slot 262 of ONU2 shown in time slot example 1). OLT1 allocates a time window 263 for registration to the ONU to be registered. The starting time of this time window 263 is time t3 and the end time is time t5. Because OLT1 allocates the timestamp 263 for registration in time slot allocation example 2, then time slot allocation example 2 is compared with time slot allocation example 1. In the next transmission cycle, OLT1 has the time slot indicated for ONU1 and the time slot indicated for ONU2. Delays occur in all time slots. Specifically, in time slot allocation example 2, OLT1 allocates time slot 264 to ONU1 in the next transmission cycle. The starting time of time slot 264 is time t5 and the end time is time t7. It can be understood that relative to time slot allocation In the time slot 253 of the ONU in Example 1, both the start time and the end time are delayed. In time slot allocation example 2, OLT1 allocates time slot 265 to ONU2 in the next transmission cycle. The starting time of time slot 265 is time t7 and the end time is time t8. It can be understood that compared to time slot allocation example 1, ONU's time slot 255, starting Delays occur at both the moment and the end moment, causing the registered ONU's uplink services to be unable to be transmitted in time. The jitter and uncertainty of the delay increase, and it will not be able to adapt to services that require high timeliness of service transmission.

The embodiment of this application provides a registration method. The registration method shown in this embodiment enables the ONU to be registered to be successfully registered to the OLT without opening a window on the OLT, solving the problem of ONU registration by opening a window. The solution to the OLT leads to bandwidth waste, increased delay and delay jitter. The specific execution process can be seen in Figure 3, where Figure 3 is a flow chart of the first steps of the registration method provided by the embodiment of the present application.

Step 301: OLT1 sends the first initial downlink data stream to ONU1.

In this embodiment, ONU1, which is directly connected to OLT1 through optical fiber and has not yet registered, is taken as an example. The process of ONU1 registering to OLT1 is first described: The first initial downstream data stream shown in this embodiment is used for ONU1 to register to OLT1. The first initial downlink data stream includes one or more continuous downlink data frames. The structure of the downlink data frame can be seen in Figure 4. Figure 4 is an example of the structure of the downlink data frame provided by the embodiment of the present application. The initial downlink data frame 400 includes a physical synchronization block (PSBd) 401 and a physical layer frame payload (physical layer frame payload) 402. PSBd401 includes fields physical synchronization (PSync) field 411, superframe counter (superframe counter, SFC) field 412, operation control (operation control, OC) field 413 and upstream bandwidth map (upstream bandwidth map, US BWmap) field 414 .

Among them, the Psync field 411 is a physical layer synchronization field, which can be used to carry downlink frame synchronization indicator symbols. The SFC field 412 is used to carry the superframe number. The superframe number carried by the SFC field 412 is essentially a frame cycle counter with a width of 30 bits. When the superframe number is 0, it indicates the start of a superframe. US BWmap field 414 is a time slot scheduling message, which is used to indicate the target time slot occupied by ONU1. Specifically, the US BWmap field 414 is used to carry the user's bandwidth map (BWMAP) information. US BWmap field 414 includes N allocation structures (Allocation Structure). Each Allocation Structure includes a bandwidth allocation identifier (allocation identifier, Alloc-ID) field 421, a slot start time (start time) field 422, and a grant size (Grant size) field 423. The Allocation ID field is used to carry the identifier (Identity, ID) of ONU1 authorized to send. The start time field is used to indicate the start time of the time slot allocated by OLT1 for ONU1. The Grant size field 423 is used to indicate the length of the time slot granted to ONU1. . In the case where the first initial downlink data flow is used to register ONU1 to OLT1, the initial downlink data frame 400 may include an Allocation Structure authorized to ONU1.

Step 302: ONU1 performs superframe synchronization according to the first initial downlink data stream.

ONU1 performs superframe synchronization based on the downlink data frame 400 included in the downlink data stream. Specifically, ONU1 maintains a cycle counter, which is used to implement superframe synchronization. Specifically, after receiving the downlink data frame 400 from OLT1, ONU1 uses the first superframe number carried in the SFC field 412 of the downlink data frame 400 as the value of the loop counter. It can be understood that ONU1 ensures that the value of the loop counter is consistent with each The superframe number carried by the SFC field 412 of a received downlink data frame 400 remains consistent, completing downlink superframe synchronization.

Step 303: ONU1 sends an initial registration request message to OLT1.

In this embodiment, the initial superframe number can be pre-agreed between ONU1 and OLT1. The initial superframe number is used to instruct ONU1 to send an initial registration request message to OLT1. When ONU1 detects the frame header of the downlink data frame carrying the initial superframe number, it sends an initial registration request message to OLT1. For example, OLT1 and ONU1 agree that if ONU1 receives the frame header of a downlink data frame carrying the target superframe number 10, ONU1 will send an initial registration request message to OLT1. For another example, OLT1 and ONU1 agree that if ONU1 receives the frame header of a downlink data frame carrying an odd target superframe number, ONU1 sends an initial registration request message to OLT1. For another example, OLT1 and ONU1 agree that if ONU1 receives downlink data carrying a target superframe number that is a multiple of 10 In the case of frame header, ONU1 sends an initial registration request message to OLT1. This embodiment does not limit the value of the initial superframe number.

In this embodiment, the initial superframe number is 10 as an example. When the SFC field 412 of the downlink data frame received by ONU1 is 10, ONU1 sends an initial registration request message to OLT1. The initial registration request message carries SN of ONU1.

The following describes the process of ONU1 sending the initial registration request message:

The process of ONU1 sending the initial registration request message will be described with reference to FIG. 5 , where FIG. 5 is an example structural diagram of the first embodiment of the ONU provided by the embodiment of this application. As shown in Figure 5, ONU1 includes two optical modules, namely optical module 501 and optical module 502. The optical module 501 includes a first transmit port (transport, TX) and a first receive port (receive, RX). The optical module 502 includes 2nd TX and 2nd RX. To form a ring network, the optical module 501 is connected to OLT1, and the optical module 502 is connected to ONU2. The ONU1 also includes a service processor 503 connected to the optical module 501 and the optical module 502 respectively. The service processor 503 shown in this embodiment may be one or more chips, or one or more integrated circuits. For example, the service processor 503 may be one or more field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), system on chips (SoCs), central Processor (central processor unit, CPU), network processor (network processor, NP), digital signal processing circuit (digital signal processor, DSP), microcontroller (micro controller unit, MCU), programmable logic controller (programmable logic device, PLD) or other integrated chips, or any combination of the above chips or processors, etc. It should be noted that in this embodiment, ONU1 includes two optical modules as an example. This embodiment does not limit the number of optical modules included in ONU1. For example, ONU1 may only include optical modules that are connected to OLT1 and ONU2 at the same time. The optical module simultaneously includes a first RX, a first TX, a second RX and a second TX. For another example, ONU1 may include more than two optical modules, and the two or more optical modules include the optical module 501 and the optical module 502 shown in FIG. 5 .

When the service processor 503 detects that the first initial downlink data stream is received via the first RX of the optical module 501, it indicates that the optical module 501 is an optical module that communicates with the OLT1. The service processor 503 sends the obtained initial registration request message to OLT1 via the first TX of the optical module 501 to ensure that the initial registration request message can be successfully sent to OLT1. It should be noted that in this embodiment, ONU1 receives the first initial downlink data stream from OLT1 as an example. In other examples, ONU1 may also receive the first initial downlink data stream from OLT2. Then, the service processor 503 detects If the first initial downlink data stream is received through the second RX of the optical module 502 of ONU1, it means that the optical module 502 is an optical module that communicates with OLT2, and the service processor 503 will obtain the initial registration request message. The second TX of the optical module 502 is sent to OLT2.

Step 304: OLT1 obtains the third RTT according to the initial registration request message.

OLT1 shown in this embodiment calculates the third RTT between OLT1 and ONU based on the sending time of sending the initial downlink data frame and the receiving time of receiving the initial registration request message. The initial downlink data frame is a downlink data frame carrying the initial superframe number.

The description will be made with reference to Figure 6a, which is a timing diagram for the OLT to obtain the third RTT provided by the embodiment of the present application. The sending time of the initial downlink data frame sent by OLT1 is the sending time TS1. When ONU1 receives the initial downlink data frame, ONU1 sends an initial registration request message to OLT1. The initial registration request message sent by ONU1 undergoes a certain delay when transmitted via the optical fiber connected between OLT1 and ONU1, causing OLT1 to receive the initial registration request message at the receiving time TS2. OLT1 determines that the third RTT between OLT1 and ONU1 is the reception time TS2 - the transmission time TS1.

Optionally, when OLT1 receives the initial registration request message, it can first authenticate the SN of ONU1 carried in the initial registration request message. For example, OLT1 can pre-configure multiple SNs that are allowed to be registered. If OLT1 determines If the SN of ONU1 carried in the initial registration request message is included in multiple SNs preconfigured by OLT1, then OLT1 determines to allow ONU1 to register.

Step 305: OLT1 sends the first downstream data stream to ONU1.

OLT1 shown in this embodiment allocates the ONU identification (ID) to ONU1 according to the SN of ONU1 carried in the initial registration request message, so as to complete the purpose of registering ONU1 to OLT1. OLT1 configures a first downstream data stream for ONU1. The first downstream data stream includes multiple downstream data frames. Please refer to Figure 4 for a description of the specific format of the downstream data frames, which will not be described in detail. The Alloc-ID1 field of the downlink data frame of the first downlink data stream carries the identity of ONU1. ONU1 determines the first target time slot allocated by OLT1 to ONU1 based on the US BWmap including the Alloc-ID1 field. ONU1 carries the uplink service to be sent by ONU1 to OLT1 on the first target time slot of the uplink data stream. ONU1 sends the uplink data stream to OLT1 to send uplink services to OLT1.

Steps 301 to 305 describe the process of registering ONU1 directly connected to OLT1 to OLT1. The following takes ONU2 as an example to explain how an ONU indirectly connected to OLT1 (that is, the connection between OLT1 and ONU2 needs to go through ONU1) registers to OLT1. process:

In this embodiment, ONU2 needs to meet a prerequisite to register with OLT1, that is, ONU1 has successfully registered with OLT1, and ONU2 has been successfully connected to ONU1 through optical fiber. The first downlink data stream shown in this embodiment carries downlink services sent by OLT1 to ONU1.

Step 306: ONU1 copies the first downstream data stream to obtain the second downstream data stream.

ONU1 receives the first downstream data stream via the optical fiber connected between ONU1 and OLT1, and ONU1 copies the first downstream data stream to obtain the second downstream data stream. It can be understood that the first downstream data stream and the second downstream data The content carried by the stream is exactly the same.

Step 307: ONU1 obtains the first downlink service carried by the first downlink data stream.

ONU1 decapsulates the first downstream data stream to obtain the first downstream service sent to ONU1 that has been carried by the first downstream data stream.

Step 308: ONU1 sends the second downstream data stream to ONU2.

This embodiment does not limit the execution timing between step 308 and step 309.

After ONU1 in this embodiment copies the first downstream data stream to obtain the second downstream data stream, ONU1 directly sends the second downstream data stream to ONU2 without parsing the first downstream data stream, thus improving This improves the timeliness of ONU2 registering to OLT1 based on the second downstream data flow, and reduces the delay of ONU2 registering to OLT1.

Step 309: ONU2 performs superframe synchronization according to the second downstream data stream.

After receiving the second downstream data stream from ONU1, ONU2 uses the downstream data frame included in the second downstream data stream to perform superframe synchronization. For a description of the structure of the downlink data frame included in the second downlink data stream, please refer to the description of Figure 4, and details will not be described again. For a description of the process of ONU2 performing superframe synchronization based on the second downstream data stream, please refer to the description of ONU1 performing superframe synchronization based on the first initial downstream data stream shown in step 302, and details will not be described again.

Step 310: ONU2 sends a registration request message to ONU1.

In this embodiment, the second downlink data stream received by ONU2 includes a target downlink data frame. The target downlink data frame is used to carry a registration trigger message. ONU2 sends the registration request message to ONU1 according to the registration trigger message. In this embodiment, the registration trigger message is the first target superframe number carried in the frame header of the target downlink data frame.

Specifically, a first target superframe number may be pre-agreed between ONU1 and ONU2, and the first target superframe number is used to instruct ONU2 to send a registration request message to ONU1. When ONU2 detects the frame header carrying the first target superframe number, ONU2 sends a registration request message to ONU1. For the description of the first target superframe number, please refer to the description of the initial superframe number shown in step 303, and details will not be described again. In this embodiment, the first target superframe number and the initial superframe number may be the same or different, and are not specifically limited in this embodiment.

In this embodiment, the first target superframe number is 10 as an example. When ONU2 receives the value of SFC field 2 of the received target downlink data frame as 10, ONU2 sends a registration request message to ONU1. The registration request The message carries the SN of ONU2. For an explanation of the process of ONU2 sending a registration request message to ONU1, please refer to Figure 5 corresponding to ONU1 sending an initial registration request message to OLT1. The details will not be elaborated.

Step 311: ONU1 measures the second RTT according to the registration request message.

ONU1 shown in this embodiment calculates the second RTT between ONU1 and ONU2 based on the first time of sending the target downlink data frame and the second time of receiving the registration request message. The target downlink data frame is a downlink data frame carrying the first target superframe number.

The description will be made with reference to Figure 6b, which is a timing example diagram for the OLT to obtain the second RTT provided by the embodiment of the present application.

OLT1 sends the first downlink data stream to ONU1 (specifically shown in step 305), ONU1 sends the second downlink data stream to ONU2, and ONU1 sends the target downlink data frame included in the second downlink data stream to ONU2 at the sending time TL1 (Specifically shown in steps 306 to 310). When ONU2 receives the target downlink data frame, ONU2 sends a registration request message to ONU1. The registration request message sent by ONU2 undergoes a certain delay when transmitted via the optical fiber connected between ONU1 and ONU2, causing ONU1 to receive the registration request message at the reception time TL2. ONU1 determines that the second RTT between ONU1 and ONU2 is the reception time TL2 - the transmission time TL1.

Optionally, when ONU1 receives the registration request message, it can first authenticate the SN of ONU2 carried in the registration request message. For example, ONU1 can pre-configure multiple SNs that are allowed to register. If ONU1 determines the registration request If the SN of ONU2 carried in the message is included in multiple SNs preconfigured by ONU1, then ONU1 determines to allow ONU2 to register.

Step 312: ONU1 sends the upstream data stream to OLT1.

In this embodiment, ONU1 obtains the first target time slot indicated by the US BWmap field of the first downstream data stream. It can be understood that the first target time slot is the upstream time slot allocated by OLT1 for ONU1 and is only occupied by ONU1. gap. ONU1 carries the uplink service of ONU1 on the first target time slot. It can be understood that ONU1 sends the uplink service of ONU1 to OLT1 on the first target time slot indicated by OLT1.

The first target time slot shown in this embodiment carries the uplink service that ONU1 needs to send to OLT1, and the first target time slot also carries the second RTT and the registration request message from ONU2. It can be understood that in the process of sending the second RTT for ONU2 registration and the registration request message to OLT1 as shown in this embodiment, there is no need for OLT1 to allocate windows occupying independent time slot resources to ONU2. ONU2 sends the registration request message and the second RTT to OLT1 through the first target time slot allocated by OLT1 to ONU1.

ONU1 shown in this embodiment can send the second RTT and the second RTT from ONU2 through physical layer operation, administration and maintenance (PLOAM) messages or management control interface (ONT/ONU management and control interface, OMCI) messages. Registration request message.

Step 313: OLT1 obtains the first RTT according to the upstream data stream.

In this embodiment, when OLT1 receives the upstream data stream, OLT1 can obtain the registration request message carrying the SN of ONU2 and the second RTT from the upstream data stream. As shown in the above step 304, OLT1 has obtained OLT1 and ONU1 between the third RTT. OLT1 shown in this embodiment determines that OLT1, ONU1 and ONU2 are connected in sequence, and OLT1 has determined the third RTT between OLT1 and ONU1 and the second RTT between ONU1 and ONU2, OLT1 can determine The first RTT between OLT1 and ONU2 = the second RTT + the third RTT.

It can be seen from this that OLT1 shown in this embodiment does not need to directly measure the RTT between OLT1 and ONU2, but obtains the relationship between OLT1 and ONU2 based on the third RTT between OLT1 and ONU1 and the second RTT between ONU1 and ONU2. The first RTT between.

Step 314: OLT1 sends the sixth downstream data stream to ONU1.

Step 315: ONU1 sends the seventh downstream data stream to ONU2.

OLT1 shown in this embodiment allocates the ID of ONU2 to ONU2 based on the SN of ONU2 carried in the registration request message. OLT1 The sixth downstream data stream is configured for ONU1 and ONU2. The sixth downstream data stream includes multiple downlink data frames. Please refer to Figure 4 for a description of the specific format of the downlink data frames, which will not be described in detail. It can be understood that the Alloc-ID1 field of the US BWmap of the sixth downstream data stream carries the identifier of ONU1, and ONU1 obtains the first target time slot occupied by ONU1 according to the Allocation Structure1 carrying Alloc-ID1.

After receiving the sixth downstream data stream, ONU1 copies the sixth downstream data stream to obtain the seventh downstream data stream. ONU1 sends the seventh downstream data stream to ONU2. Similarly, the Alloc-ID2 field of the US BWmap of the seventh downstream data stream carries the identity of ONU2. ONU2 obtains the second target time slot occupied by ONU2 based on the Allocation Structure2 carrying Alloc-ID2. Then, ONU2 can pass the second target The time slot sends the uplink service of ONU2 to OLT1.

Specifically, OLT1 sends the seventh downstream data stream to ONU2 through the forwarding of ONU1. For a description of the process of ONU2 receiving the seventh downstream data stream, please refer to the description of the process of ONU2 receiving the second downstream data stream, which will not be described again.

In this embodiment, OLT1 executes the registration process of the ONU to be registered as an example. In other examples, OLT2 may also execute the registration process of the ONU to be registered. For the description of OLT2 executing the registration process of the ONU to be registered, please refer to this embodiment. The OLT1 shown performs the registration process of the ONU to be registered, and the details will not be described in detail.

In this embodiment, the ring network only includes OLT1, ONU1, ONU2 and OLT2 as an example. This embodiment does not limit the number of ONUs included in the ring network. In other examples, the ring network can also include more numbers. ONU. In the case of a ring network including multiple ONUs connected in sequence between OLT1 and OLT2, OLT1 can create the corresponding relationship as shown in Table 1 below:

Table 1

For example, when OLT1 measures the third RTT between OLT1 and ONU1, OLT1 creates the correspondence shown in Table 1. The correspondence shown in Table 1 includes the correspondence between "OLT1—ONU1" and the third RTT. relationship, it can be understood that based on the corresponding relationship shown in Table 1, OLT1 can determine that the RTT between OLT1 and ONU1 is the third RTT. Similarly, when OLT1 obtains the first RTT between OLT1 and ONU2, the correspondence relationship shown in Table 1 includes the correspondence relationship between "OLT1-ONU2" and the first RTT. If ONU4 connected between ONU2 and OLT2 in the ring network needs to register with OLT1, ONU2 that has successfully registered can be responsible for measuring the fourth RTT between ONU2 and ONU3. Among them, ONU2 measures the fourth RTT between ONU2 and ONU3 For the description of the process, please refer to the description of the process of ONU1 measuring the second RTT between ONU1 and ONU2 shown above. The details will not be described again. ONU3 multiplexes the second target time slot occupied by ONU2 to send the SN of ONU3 and the fourth RTT to OLT1. According to the corresponding relationship shown in Table 1, OLT1 can determine that the RTT between OLT1 and ONU2 is the first RTT, then OLT1 can determine the fifth RTT between OLT1 and ONU3 = first RTT + fourth RTT, and OLT obtains the fifth For the description of the RTT process, please refer to the description of the process of OLT1 obtaining the first RTT shown above, and the details will not be described again. It can be understood that based on the created correspondence relationship shown in Table 1, OLT1 can register the ONU to be registered in the ring network. It should be noted that in this example, ONU2 is responsible for measuring the RTT between ONU2 and ONU3. In other examples, ONU1 can also be responsible for measuring the RTT between ONU1 and ONU3, and ONU2 is responsible for forwarding the RTT between ONU1 and ONU3 for registration. For the data and description of the process of ONU1 measuring the RTT between ONU1 and ONU3, please refer to the description of the process of ONU1 measuring the RTT between ONU1 and ONU2. The details will not be repeated.

Using the method shown in this embodiment, OLT1 measures the RTT between OLT1 and each ONU without opening a window. For example, the OLT1 shown in this embodiment can measure the third RTT between OLT1 and ONU1 without opening a window. , OLT1 does not need to measure the second RTT between OLT1 and ONU2 based on the windowing method. Because OLT1 does not need to allocate windows occupying independent time slot resources for measuring RTT, The RTT between OLT1 and each ONU can be realized, which reduces the waste of time slot resources and improves the utilization rate of time slot resources.

The downstream ONU (for example, ONU2) in the ring network can send a registration request message to OLT1 through the time slot indicated by OLT1 for the upstream ONU (for example, ONU1). The downstream ONU does not need to occupy independent time slot resources to send the registration request message to OLT1. In the case where N ONUs included in the ring network have been registered to OLT1, even if the ONU to be registered needs to be registered to OLT1, the ONU1 to be registered does not need to occupy an independent time slot to register, then the N registered ONUs will occupy There will be no delay at the position of the N time slots, ensuring the timely transmission of the registered ONU's uplink services, reducing the delay jitter, and being able to adapt to services with high requirements on timeliness of service transmission.

In the embodiment shown in Figure 3, ONU1 measures the second RTT between ONU1 and ONU2, and OLT1 measures the first RTT based on the second RTT and the third RTT. In the embodiment shown in Figure 6b, OLT1 directly measures the first RTT. RTT, where Figure 7 is a second step flow chart of the registration method provided by the embodiment of the present application.

Step 701: OLT1 sends the first initial downlink data stream to ONU1.

Step 702: ONU1 performs superframe synchronization according to the first initial downlink data stream.

Step 703: ONU1 sends an initial registration request message to OLT1.

Step 704: OLT1 obtains the third RTT according to the initial registration request message.

Step 705: OLT1 sends the first downstream data stream to ONU1.

Step 706: ONU1 copies the first downstream data stream to obtain the second downstream data stream.

Step 707: ONU1 obtains the first downlink service carried by the first downlink data stream.

Step 708: ONU1 sends the second downstream data stream to ONU2.

Step 709: ONU2 performs superframe synchronization according to the second downstream data stream.

Step 710: ONU2 sends a registration request message to ONU1.

For description of the execution process of steps 701 to 710 shown in this embodiment, please refer to the description of the execution process of step 301 to step 310 corresponding to Figure 3, and details will not be described again.

Step 711: ONU1 sends the upstream data stream to OLT1.

In this embodiment, ONU1 obtains the first target time slot indicated by the US BWmap field of the first downstream data stream. For a specific description of the first target time slot, please refer to the corresponding step 312 in Figure 3. The details are not included. Repeat. ONU1 shown in this embodiment carries the uplink service of ONU1 on the first target time slot. ONU1 also carries the registration request message from ONU2 on the first target time slot. In this embodiment, ONU1 does not need to measure the second RTT between ONU1 and ONU2, so ONU1 directly sends the registration request message from ONU2 to OLT1 through the first target time slot.

Step 712: OLT1 obtains the first RTT according to the upstream data stream.

OLT1 measures the first RTT between OLT1 and ONU2 according to the registration request message of ONU2 included in the upstream data stream. For description of the process of OLT1 measuring the first RTT shown in this embodiment, please refer to the description of the process of OLT1 measuring the third RTT, and details will not be described again.

Step 713: OLT1 sends the sixth downstream data stream to ONU1.

Step 714: ONU1 sends the seventh downstream data stream to ONU2.

For an explanation of the execution process of steps 713 to 714 shown in this embodiment, please refer to the corresponding steps 314 to 315 shown in Figure 3, and the specific execution process will not be described again.

Using the method shown in this embodiment, OLT1 directly measures the first RTT between OLT1 and ONU2, which improves the accuracy of the measured first RTT. Moreover, in the process of measuring the first RTT, OLT1 does not need to allocate independent time slots to ONU2, which reduces the waste of time slot resources, improves the utilization of time slot resources, and reduces the delay jitter of service transmission.

In the embodiments shown in Figure 3 and Figure 7, OLT1 measures the RTT between OLT1 and ONU1 based on a window-free method. In the embodiment shown in Figure 8, OLT1 can measure the RTT between OLT1 and ONU1 based on a windowing method, and ONU1 can measure the RTT between ONU1 and ONU2 based on a windowing method. Among them, FIG. 8 is a third step flow chart of the registration method provided by the embodiment of the present application.

Step 801: OLT1 sends the second initial downlink data stream to ONU1.

This embodiment takes as an example that ONU1, which is directly connected to OLT1 and has not yet registered, first describes the process of ONU1 registering on OLT1: the second initial downstream data flow shown in this embodiment is used for ONU1 to register on OLT1. The second initial downlink data stream includes one or more continuous downlink data frames. The structure of the downlink data frames can be seen in Figure 4 and will not be described in detail. The US BWmap field of the second initial downlink data stream shown in this embodiment has carried an initial registration trigger message, and the initial registration trigger message is used to indicate the start and end time slots of the discovery time window included in the uplink data stream.

Step 802: ONU1 performs superframe synchronization according to the second initial downlink data stream.

For an explanation of the execution process of step 802 shown in this embodiment, please refer to the corresponding step 302 shown in Figure 3, and details will not be described again.

Step 803: ONU1 sends an initial registration request message to OLT1.

In this embodiment, if ONU1 needs to register with OLT1, ONU1 carries the initial registration request message in the discovery time window of the upstream data stream according to the instructions of the initial registration trigger message of the second initial downstream data stream. For instructions, please refer to step 303 corresponding to Figure 3, and details will not be repeated.

Step 804: OLT1 sends the third initial downlink data stream to ONU1.

OLT1 obtains the initial registration request message of ONU1 through the discovery time window, then OLT1 allocates the ID of ONU1 to ONU1, and sends the third initial downstream data stream carrying the ID of ONU1 to ONU1. The third initial downlink data stream shown in this embodiment includes one or more continuous downlink data frames. Please refer to Figure 4 for the frame format of the downlink data frames, and details will not be described again. The US BWmap field included in the third initial downlink data stream shown in this embodiment has carried the first initial measurement message. The first initial measurement message is used to indicate the start and end time slots of the ranging time window included in the uplink data stream. .

Step 805: ONU1 sends the second initial measurement message to OLT1.

In this embodiment, when ONU1 receives the third initial downlink data stream, ONU1 can obtain the ranging time window based on the US BWmap field of the third initial downlink data stream. ONU1 carries the second initial measurement message in the ranging time window of the upstream data stream.

Step 806: OLT1 receives the second initial measurement message carried in the ranging time window.

Step 807: OLT1 measures the third RTT according to the first initial measurement message and the second initial measurement message.

OLT1 shown in this embodiment has obtained the sending time TJ1 for sending the first initial measurement message, and OLT1 can also obtain the receiving time TJ2 for receiving the second initial measurement message. Then OLT1 determines that the third RTT = receiving time TJ2 - sending time TJ1 .

Optionally, when OLT1 receives the initial registration request message, it can first authenticate the SN of ONU1 carried in the initial registration request message. For an explanation of the process of OLT1 authenticating the initial registration request message, see Figure 3 The details of the corresponding embodiments will not be described again.

Step 808: OLT1 sends the third downstream data stream to ONU1.

OLT1 configures a third downstream data stream for ONU1. The third downstream data stream includes multiple downlink data frames. Please refer to Figure 4 for a description of the specific format of the downlink data frames, which will not be described in detail. The Alloc-ID1 field of the downstream data frame of the third downstream data stream carries the identifier of ONU1. ONU1 determines the first target time slot allocated by OLT1 to ONU1 based on the US BWmap including the Alloc-ID1 field. For the description of the first target time slot, please refer to the corresponding embodiment in Figure 3, and the details will not be repeated.

Steps 801 to 808 describe the process of registering ONU1 directly connected to OLT1 to OLT1. The following takes ONU2 as an example. Describe the process of registering to OLT1 for an ONU that is indirectly connected to OLT1 (that is, the connection between OLT1 and ONU2 needs to go through ONU1):

In this embodiment, ONU2 needs to meet a prerequisite to register with OLT1, that is, ONU1 has successfully registered with OLT1, and ONU2 has successfully connected with ONU1. The first downlink data stream shown in this embodiment carries downlink services sent by OLT1 to ONU1.

Step 809: ONU1 copies the third downstream data stream to obtain the fourth downstream data stream.

ONU1 receives the third downstream data stream via the optical fiber connected between ONU1 and OLT1, and ONU1 copies the third downstream data stream to obtain the fourth downstream data stream. It can be understood that the third downstream data stream and the fourth downstream data stream carry The content is exactly the same.

Step 810: ONU1 obtains the first downlink service carried by the third downlink data stream.

ONU1 decapsulates the third downstream data stream to obtain the first downstream service sent to ONU1 that has been carried by the third downstream data stream.

Step 811: ONU1 sends the fifth downstream data stream to ONU2.

This embodiment does not limit the execution timing between step 810 and step 811.

ONU1 shown in this embodiment adds a registration trigger message to the US BWmap field of the copied fourth downstream data stream to obtain the fifth downstream data stream. The registration trigger message is used to instruct ONU2 to send a registration request message, where, registration The request message is the SN of ONU2. Optionally, ONU2 shown in this embodiment can send a registration request message to ONU1 when receiving the registration trigger message. Optionally, the registration trigger message can also indicate the start and end time slots of the discovery window. ONU2 Within the start and end time slots of the discovery window indicated by the registration trigger message, a registration request message is sent to ONU1.

In this embodiment, ONU1 adds a registration trigger message in the fourth downstream data stream to obtain the fifth downstream data stream as an example. In other examples, the registration trigger message can also be set by OLT1 in the third downstream data stream. Specifically, There are no limitations in this embodiment.

Step 812: ONU2 performs superframe synchronization according to the fifth downstream data stream.

Step 813: ONU2 sends a registration request message to ONU1.

In this embodiment, if ONU2 needs to register with OLT1, ONU2 sends a registration request message to ONU1 according to the instruction of the registration trigger message of the fifth downstream data flow. For the description of the registration request message, please refer to step 303 corresponding to Figure 3. shown and will not be described in details.

Step 814: ONU1 sends the first measurement message to ONU2.

Step 815: ONU1 receives the second measurement message from ONU2.

Step 816: ONU1 measures the second RTT according to the first measurement message and the second measurement message.

For an explanation of the process of ONU1 measuring the second RTT based on the first measurement message and the second measurement message shown in this embodiment, please refer to the process of OLT1 measuring the third RTT based on the first measurement message and the second measurement message shown in step 807. The details will not be elaborated. It can be understood that ONU1 shown in this embodiment has obtained the third time TK1 for sending the first measurement message, and ONU1 can also obtain the fourth time TK2 for receiving the second measurement message from ONU2. Then ONU1 determines that the second RTT= The fourth time TK2-the third time TK1.

Optionally, when ONU1 receives the registration request message, it can first authenticate the SN of ONU2 carried in the registration request message. For an explanation of the process of ONU1 authenticating the registration request message, please refer to the corresponding implementation in Figure 3. The description of the example will not be repeated in details.

Step 817: ONU1 sends the upstream data stream to OLT1.

Step 818: OLT1 obtains the first RTT according to the upstream data stream.

Step 819: OLT1 sends the sixth downstream data stream to ONU1.

Step 820: ONU1 sends the seventh downstream data stream to ONU2.

For a description of the execution process of steps 817 to 820 shown in this embodiment, please refer to the description of the execution process of steps 312 to 315 corresponding to Figure 3, and details will not be described again.

If the ring network shown in this embodiment includes more than two ONUs, for the process of OLT measuring the RTT between each ONU, please refer to the description shown in Table 1 corresponding to Figure 3, and the details will not be described again.

Using the method shown in this embodiment, OLT1 measures the RTT between OLT1 and ONU1 based on the windowing method, and ONU1 measures the RTT between ONU1 and ONU2 based on the windowing method. If there are ONUs to be registered in the ring network, timely registration of the ONUs to be registered can be guaranteed.

In the embodiment shown in Figure 8, ONU1 measures the second RTT between ONU1 and ONU2 in a window-based manner. ONU1 then sends the second RTT to OLT1, so that OLT1 can respond to the second RTT and the registration request message of ONU2. , obtaining the first RTT as an example. In other examples, ONU1 may not measure the second RTT between ONU1 and ONU2, but directly send the registration request message of ONU2 to OLT1 through the first target time slot occupied by ONU1, and OLT1 directly measures the first time slot based on the windowing method. RTT (for the specific measurement process, please refer to the description of the process of measuring the third RTT based on the windowing method of OLT1 corresponding to Figure 8, which will not be described in detail).

As another example, in other embodiments, OLT1 may measure the third RTT between OLT1 and ONU1 based on a windowing method (for an explanation of the process of obtaining the third RTT based on a windowing method, please refer to Figure 8 to obtain the third RTT. The process will not be described in detail). And ONU2 measures the second RTT between ONU1 and ONU2 based on the method without opening the window (for the description of the process of obtaining the second RTT based on the method without opening the window, please refer to the description of the process of obtaining the second RTT corresponding to Figure 3. For details No further details will be given). ONU2 then sends the second RTT and the registration request message of ONU2 to OLT1 through the first target time slot. OLT1 obtains the first RTT based on the second RTT and registration request message carried by the first target time slot.

As another example, in other embodiments, OLT1 can measure the third RTT between OLT1 and ONU1 based on a window-free method (for an explanation of the process of obtaining the third RTT based on a window-free method, please refer to Figure 3 to obtain the third RTT. The process of RTT will not be described in detail). ONU2 can measure the second RTT between ONU1 and ONU2 based on the windowing method (for an explanation of the process of obtaining the second RTT based on the windowing method, please refer to the description of the process of obtaining the second RTT corresponding to Figure 8, which is not specific. (do not elaborate). ONU2 then sends the second RTT and the registration request message of ONU2 to OLT1 through the first target time slot. OLT1 obtains the first RTT based on the second RTT and registration request message carried by the first target time slot.

The downstream ONU (for example, ONU2) in the ring network can send a registration request message to OLT1 through the time slot indicated by OLT1 for the upstream ONU (for example, ONU1). The downstream ONU does not need to occupy independent time slot resources to send the registration request message to OLT1. In the case where N ONUs included in the ring network have been registered to OLT1, even if the ONU to be registered needs to be registered to OLT1, the ONU1 to be registered does not need to occupy an independent time slot to register, then the N registered ONUs will occupy There will be no delay at the position of the N time slots, ensuring timely transmission of the registered ONU's uplink services, reducing delay jitter, and being able to adapt to services with high requirements on timeliness of service transmission.

Based on the structure of the ring network 200 shown in Figure 1b, the port 1 of the OLT1 and the port 2 of the ONU1 are connected through the optical fiber 211. If at least one of the optical fiber 211, port 1 of OLT1 or port 2 of ONU1 fails, optical signals cannot be transmitted between OLT1 and ONU1, and the downlink service from OLT1 cannot be transmitted to ONU1 via optical fiber 211. As a result, the upstream services of ONU1 cannot be transmitted to OLT1 via optical fiber 211. This embodiment can also ensure that ONU1 can normally receive downlink services when services cannot be transmitted between OLT1 and ONU1, and can ensure that ONU1 can normally send uplink services.

The structure of the ONU1 shown in this embodiment is first described below with reference to FIG. 9 , where FIG. 9 is a diagram of the present application. Please provide an example structural diagram of ONU1 in the embodiment.

The ONU1 shown in this embodiment includes an optical module 901 and an optical module 902. The optical module 901 includes a first transmit port (transport, TX) and a first receive port (receive, RX). The optical module 902 includes a second TX and a first receive port. 2RX. This embodiment does not limit the number of optical modules included in ONU1. For example, the first TX, the first RX, the second TX and the second RX are all different ports of the same optical module. For another example, ONU1 may include any number of more than two optical modules. The first RX and the first TX are the transceiver ports of one optical module included in the ONU1, and the second RX and the second TX are other optical modules included in the ONU1. The transceiver port of an optical module.

The ONU1 shown in this embodiment also includes a switching device. The switching device includes a detector 910 and a switch array 930 connected to the detector 910 . The switch array 930 includes M input ports and M output ports. M shown in this embodiment is any positive integer greater than or equal to 2. In this embodiment, ONU1 includes two optical modules as an example. The switch array 930 includes four input ports, namely a first input port 911, a second input port 922, a third input port 913 and a fourth input port 924. The switch array 930 includes four output ports, namely a first output port 921, a second output port 912, a third output port 923 and a fourth output port 914.

It should be noted that the number of input ports and output ports included in the switch array 930 shown in this embodiment is not limited. The detector 910 shown in this embodiment is used to connect any input port included in the switch array 930 to the first output port included in the switch array 930 .

OLT1 shown in this embodiment is the master OLT, and OLT2 is the slave OLT. The upstream data stream and the downstream data stream are transmitted between ONU1 and the master OLT1. When OLT1 is the master OLT, the detector 910 causes the switch array 903 to The first input port 911 is connected to the first output port 921 , and the first output port 921 is connected to the first processing port 941 of the service processor 940 . The detector 910 also connects the fourth output port 914 of the switch array to the fourth input port 924 , and the fourth input port 924 is connected to the second processing port 942 of the service processor 940 . The first input port 911 and the fourth output port 914 are both connected to the optical module 901. Similarly, the detector 910 connects the second output port 912 of the switch array 903 to the second input port 922, and the second input port 922 is connected to the third processing port 943 of the service processor 940. The detector 910 connects the third input port 913 of the switch array 930 to the third output port 923 , and the third output port 923 connects to the fourth processing port 944 of the service processor 940 .

The detector 910 shown in this embodiment may be one or more chips, or one or more integrated circuits. For example, the detector 910 may be one or more FPGAs, ASICs, SoCs, CPUs, NPs, DSPs, MCUs, PLDs or other integrated chips, or any combination of the above chips or processors. For the description of the service processor 940, please refer to the description of the form of the detector 910, and details will not be repeated. The service processor 940 and the detector 910 shown in this embodiment may be implemented in separate structures or in the same structure, and are not specifically limited in this embodiment.

The process of ONU1 shown in FIG. 9 executing the registration method is explained with reference to FIG. 10 , where FIG. 10 is a fourth step flow chart of the registration method provided by the embodiment of the present application.

Step 1001: ONU1 selects the first RX and the first TX.

Two OLTs are connected to ONU1, that is, ONU1 is connected to OLT1 through the first RX and the first TX, and ONU1 is connected to OLT2 through the second RX and the second TX. ONU1 selects an OLT as the main OLT for upstream and downstream service transmission. If ONU1 is determined OLT1 serves as the main OLT, and ONU1 selects the first RX and the first TX connected to the main OLT. If ONU1 determines OLT2 as the main OLT, ONU1 selects the second RX and the second TX connected to the main OLT. In this embodiment, ONU1 selects OLT1 as the main OLT as an example, and ONU1 needs to register with OLT1. In other examples, ONU1 may also select OLT2 as the main OLT. For the description of ONU1 selecting OLT2 as the main OLT, please refer to the description of ONU1 selecting OLT1 as the main OLT shown in this embodiment, which will not be described again. In this embodiment, ONU1 includes two RXs as an example. In other examples, ONU1 may include any number of more than two RXs. The following describes several optional ways for ONU1 to select the first RX:

Optional method 1

The service processor 940 attempts to receive the downlink data stream through both the first RX and the second RX. When the first RX receives the downlink data stream from OLT1 and the second RX does not receive the downlink data stream from OLT2, the service processor 940 Processor 940 determines OLT1 as the primary OLT.

Optional method 2

The service processor 940 attempts to receive the downlink data stream through both the first RX and the second RX. When the first RX receives the downlink data stream from OLT1 and the second RX receives the downlink data stream from OLT2, the service processor 940 The device determines whether the signal quality of the downlink data stream received by the first RX is better than the signal quality of the downlink data stream received by the second RX. In the case where the service processor determines that the signal quality of the downlink data stream received by the first RX is better than the signal quality of the downlink data stream received by the second RX, the service processor determines OLT1 as the primary OLT.

The signal quality received by the first RX is better than the signal quality received by the second RX, which means at least one of the following:

The bit error rate of the downlink data stream received by the first RX is lower than the bit error rate of the downlink data stream received by the second RX. The optical power of the downlink data stream received by the first RX is greater than the downlink data received by the second RX. The optical power of the stream, the latency of the downlink data stream received by the first RX is lower than that of the downlink data stream received by the second RX, or the crosstalk of the downlink data stream received by the first RX is lower than that received by the second RX. Crosstalk of downstream data flows, etc.

Step 1002: The first RX of ONU1 receives the first initial downlink data stream from OLT1.

The optical module 901 shown in this embodiment is connected to OLT1 through optical fiber, and the first RX of ONU1 receives the first initial downlink data stream from OLT1. For the description of the first initial downlink data stream, please refer to step 301 corresponding to Figure 3 shown and will not be described in details.

Step 1003: The service processor of ONU1 performs superframe synchronization according to the first initial downlink data stream.

In the optical module 901 shown in this embodiment, the first input port 911, the first output port 921 and the first processing port 940 of the service processor 940 are connected in sequence. Then the optical module 901 receives the first initial signal from the first RX. The downstream data flow is transmitted to the service processor 940 via the first input port 911, the first output port 921 and the first processing port 940 of the service processor 940 in sequence. The service processor 940 processes the first initial downlink data flow to perform superframe synchronization. The service processor 940 performs the process of superframe synchronization. Please refer to the corresponding step 302 in Figure 3, which will not be described in detail.

Step 1004: The first TX of ONU1 sends an initial registration request message to OLT1.

The second processing port 942, the fourth input port 924, the fourth output port 914 and the optical module 901 of the service processor 940 shown in this embodiment are connected in sequence, then the initial registration request message output by the service processor 940 is sequentially It is transmitted to the first TX via the second processing port 942, the fourth input port 924, the fourth output port 914 and the optical module 901. The optical module 901 sends the initial registration request message to the OLT1 through the first TX. For instructions, please refer to the corresponding instructions in Figure 3. Details will not be repeated.

Step 1005: OLT1 obtains the third RTT according to the initial registration request message.

For description of the execution process of step 1005 shown in this embodiment, please refer to the description of step 304 corresponding to Figure 3, and details will not be described again.

Step 1006: The first RX of ONU1 receives the first downlink data stream from OLT1.

For the process of the first RX of ONU1 receiving the first downlink data stream from OLT1 shown in this embodiment, please refer to the process of ONU1 receiving the initial downlink data stream shown in step 1005, which will not be described in detail in this embodiment.

Step 1007: The service processor of ONU1 copies the first downstream data stream to obtain the second downstream data stream.

Step 1008: The service processor of ONU1 obtains the first downlink service carried by the first downlink data stream.

For description of the process of the service processor executing steps 1007 to 1008 in this embodiment, please refer to the description of the execution process of steps 306 to 307 corresponding to Figure 3, and details will not be described again.

Step 1009: The second TX of ONU1 sends the second downstream data stream to ONU2.

The third processing port 940 of the service processor 940 shown in this embodiment outputs the second downlink data stream, and the third processing port 943, the second input port 922, the second output port 912 and the optical The modules 902 are connected in sequence, and the second downlink data stream output by the service processor 940 is transmitted to the second TX via the third processing port 943, the second input port 922, the second output port 912 and the optical module 902 in sequence. The second TX is connected to ONU2 through an optical fiber, so the second downstream data stream output by the second TX can be successfully transmitted to ONU2.

Step 1010: The service processor of ONU2 performs superframe synchronization according to the second downstream data stream.

For description of the execution process of step 1010 shown in this embodiment, please refer to the description of step 309 corresponding to Figure 3, and details will not be described in this embodiment.

Step 1011: The second RX of ONU1 receives the registration request message from ONU2.

The optical module 902 of ONU1 shown in this embodiment, the third input port 913, the third output port 923 and the fourth processing port 944 are connected in sequence, then the registration request message received by the second RX can be sent through the optical module 902 in sequence , the third input port 913, the third output port 923 and the fourth processing port 944 are transmitted to the service processor 940. For the description of the registration request message, please refer to the description of step 310 corresponding to Figure 3, and the details will not be repeated.

Step 1012: The service processor of ONU1 measures the second RTT according to the registration request message.

For the execution process of step 1012 shown in this embodiment, please refer to the description of step 311 corresponding to Figure 3, and details will not be described again.

Step 1013: The first TX of ONU1 sends the upstream data stream to OLT1.

For the description of the sending process of the first TX of ONU1 sending the uplink data stream to OLT1 shown in this embodiment, please refer to the description of the sending process of the first TX of ONU1 sending the initial registration request message to OLT1 shown in step 1004. Book For the description of the upstream data flow shown in the embodiment, please refer to the description of step 312 corresponding to Figure 3, and details will not be described again.

Step 1014: OLT1 obtains the first RTT according to the upstream data stream.

For description of the execution process of step 1014 shown in this embodiment, please refer to the description of step 313 corresponding to Figure 3, and details will not be described again.

Step 1015: The first RX of ONU1 receives the sixth downlink data stream from OLT1.

The sixth downlink data stream received by the first RX of ONU1 can be transmitted to the service processor 940 via the first input port 911, the first output port 921 and the first processing port 940 of the service processor 940, and the sixth downlink data stream For the description of the flow, please refer to step 314 corresponding to Figure 3, and the details will not be described again.

Step 1016: The second TX of ONU1 sends the seventh downstream data stream to ONU2.

The seventh downlink data stream output by the third processing port 943 of the service processor 940 is sequentially transmitted to the second TX via the second input port 922, the second output port 912 and the optical module 902, and the second TX sends the seventh downlink data stream to the ONU2. Seven downstream data streams. For specific description of the seventh downstream data stream, please refer to the description of step 315 corresponding to Figure 3, and the details will not be described again.

ONU1 shown in Figure 9 can also be used to execute the methods corresponding to Figures 7 and 8. During the execution of the methods shown in Figures 7 and 8, the data transmission path between ONU1 and OLT1, and the data transmission path between ONU1 and ONU2 For the description of the data flow transmission path, please refer to the corresponding description in Figure 10, and the details will not be repeated.

As shown in Figure 10, OLT1 is the master OLT and OLT2 is the slave OLT. That is, ONU1 and ONU2 shown in this embodiment are both registered to OLT1. See Figure 11. Figure 11 is provided by the embodiment of the present application. Flow chart of the fifth step of the registration method. In this embodiment, OLT1 can send downlink data streams normally, but a fault event occurs between OLT2 and ONU1, causing both ONU1 and ONU2 to need to register with OLT1.

Step 1101. ONU1 detects a fault event between the second RX and OLT2.

The optical module 902 shown in this embodiment is connected to ONU2 and OLT2 in sequence. If ONU1 registers with OLT2, the second RX of ONU1 is required to receive the downstream data stream from OLT2. However, as shown in Figure 12, Figure 12 is a second structural example diagram of ONU1 provided by the embodiment of the present application. In the example shown in Figure 12, if a fault event occurs between OLT2 and the second RX, the downstream data stream of OLT2 cannot be successfully transmitted to the second RX, and thus ONU1 cannot successfully receive the downstream data stream from OLT2.

For example, the detector 910 of ONU1 can be connected to the optical module 902. The detector 910 detects whether the second RX of the optical module 902 can normally receive the optical signal. If the detector 910 exceeds the preset time period and continues to be unable to detect the second RX If the RX successfully receives the optical signal or the optical power of the continuously detected optical signal is less than the preset threshold, it is determined that a fault event occurs between OLT2 and the second RX of ONU1. For another example, the detector 910 is connected to the line between the optical module 902 and the third input port 913. The detector 910 obtains the electrical signal output by the optical module 902 based on the line. The detector 910 detects whether the electrical signal includes consecutive valid frames. If not, it is determined that a fault event occurs between OLT2 and the second RX of ONU1. For another example, the detector 910 detects that the bit error rate of the electrical signal exceeds a preset threshold. This embodiment does not limit how the detector 910 determines that a fault event occurs between OLT2 and the second RX of ONU1. As long as there is a fault event between OLT2 and the second RX of ONU1, the downstream data flow from OLT2 cannot Successfully transferred to ONU1.

Step 1102: The detector of ONU1 switches the switch array from the first conduction mode to the second conduction mode.

Specifically, when ONU1 detects a fault event between the second RX and OLT2, in order to transmit uplink and downlink services, ONU1 needs to register with OLT1, that is, switch the main OLT from OLT2 to OLT1, so as to realize ONU1 and OLT2. Transmission of uplink and downlink services between OLT1. In order to ensure that ONU1 can successfully register with OLT1, the detector 910 of ONU1 needs to switch the switch array 930 from the first conduction mode to the second conduction mode.

As shown in this embodiment, when the switch array 930 is in the second conduction mode, OLT1 is the master OLT and OLT2 is the slave OLT. That is, ONU1 receives the first initial downlink data stream from OLT1, and OLT1 allocates a time slot for ONU1 to send uplink services. The description of the second conduction mode is shown in Figure 9 and will not be described in detail.

As shown in this embodiment, when the switch array 930 is in the first conduction mode, OLT2 is the master OLT and OLT1 is the slave OLT. That is, ONU1 is allocated a time slot by OLT2 for sending uplink services. The first conduction mode means that the third input port 913 and the first output port 921 are connected. The second output port 912 and the fourth input port 942 are connected. The fourth output port 914 and the second input port 922 are connected. The first input port 911 and the third output port 923 are connected.

It should be noted that in this embodiment, ONU1 detects a fault event between the second RX and OLT2, thereby triggering the switch array to switch from the first conduction mode to the second conduction mode. In other examples, ONU1 also For example, a fault event may occur between the second TX and the OLT2, thereby triggering the switch array to switch from the first conduction mode to the second conduction mode. Among them, ONU1 detects a fault event between the second TX and OLT2. The data sent by the second TX of ONU1 to OLT2 exceeds the time threshold but is not successfully sent. It is determined that a fault event occurs between the second TX and OLT2.

ONU2 shown in this embodiment determines that OLT1 is the master OLT and OLT2 is the slave OLT. Please refer to step 1102 for the description, which will not be described again.

Step 1103: The first RX of ONU1 receives the first initial downlink data stream from OLT1.

Step 1104: The service processor of ONU1 performs superframe synchronization according to the first initial downlink data stream.

Step 1105: The first TX of ONU1 sends an initial registration request message to OLT1.

Step 1106: OLT1 obtains the third RTT according to the initial registration request message.

Step 1107: The first RX of ONU1 receives the first downlink data stream from OLT1.

Step 1108: The service processor of ONU1 copies the first downstream data stream to obtain the second downstream data stream.

Step 1109: The service processor of ONU1 obtains the first downlink service carried by the first downlink data stream.

Step 1110: The second TX of ONU1 sends the second downstream data stream to ONU2.

Step 1111: The service processor of ONU2 performs superframe synchronization according to the second downstream data stream.

Step 1112: The second RX of ONU1 receives the registration request message from ONU2.

Step 1113: The service processor of ONU1 measures the second RTT according to the registration request message.

Step 1114: The first TX of ONU1 sends the upstream data stream to OLT1.

Step 1115: OLT1 obtains the first RTT according to the upstream data stream.

Step 1116: The first RX of ONU1 receives the sixth downlink data stream from OLT1.

Step 1117: The second TX of ONU1 sends the seventh downlink data stream to ONU2.

For an explanation of the execution process of steps 1103 to 1117 shown in this embodiment, please refer to the corresponding steps 1002 to 1016 shown in Figure 10, and the specific execution process will not be described again.

ONU1 shown in Figure 12 can also be used to execute the methods corresponding to Figures 7 and 8. During the execution of the methods shown in Figures 7 and 8, the data transmission path between ONU1 and OLT1, and the data transmission path between ONU1 and ONU2 For the description of the data stream transmission path, please refer to the corresponding description in Figure 12, and the details will not be repeated.

Using the method shown in this embodiment, in the event of a fault event between OLT2 and ONU1, the switch array included in ONU1 can switch the conduction mode, so that ONU1 that has switched the conduction mode can register to another OLT (such as OLT1 shown above), so that ONU1 can communicate with OLT1, ensuring the successful transmission of uplink and downlink services of ONU1.

An embodiment of the present application also provides a communication device. The structure of the communication device is shown in FIG. 13 , where FIG. 13 is an example structural diagram of the communication device provided by an embodiment of the present application. The communication device 1300 shown in this embodiment includes a transceiver 1301 and a service processor 1302, where the transceiver 1301 and the service processor 1302 are connected. The communication device shown in this embodiment may be an OLT. The transceiver 1301 included in the OLT is used to perform the transceiver-related functions performed by the OLT in the embodiments shown in Figures 3, 7, 8, 10 and 11. process. The service processor 1302 included in the OLT is used to execute the processing-related processes executed by the OLT in the embodiments shown in FIG. 3, FIG. 7, FIG. 8, FIG. 10, and FIG. 11.

The communication device shown in this embodiment can be any ONU included in the ring network. The transceiver 1301 included in the ONU is used to execute the processes related to transceiver and transceiver executed by the ONU in the embodiments shown in Figures 3, 7, 8, 10 and 11. The service processor 1302 included in the ONU is used to execute the processing-related processes executed by the ONU in the embodiments shown in FIG. 3, FIG. 7, FIG. 8, FIG. 10, and FIG. 11.

Specifically, for the ONU shown in this embodiment, see ONU1 shown in Figure 9 or Figure 12 . More specifically, the transceiver 1301 of the communication device 1300 may include the optical module 901 and the optical module 902 shown in Figure 9 or Figure 12. For a specific description of the optical module 901 and the optical module 902, please refer to Figure 9 or Figure 12. Explanation without going into details. It should be noted that in this embodiment, the transceiver 1301 includes two optical modules as an example. In other examples, the transceiver 1301 may include only one optical module, or more than two optical modules. When the communication device 1300 includes two or more optical modules, a complex-structured network can be implemented. This embodiment does not limit the specific network type. For example, as shown in Figure 14, communication equipment including three optical modules can form a dual-ring network. Figure 14 is an example diagram of a dual-ring network structure provided by an embodiment of the present application.

The dual-ring network 1400 includes an OLT1 and an ONU1 connected to the OLT1. The service processor 1402 of the ONU1 is connected to an optical module 1401, an optical module 1403 and an optical module 1404 respectively. Optical module 1401 is connected to OLT1, optical module 1403 is connected to ONU2, and optical module 1401 is connected to ONU3. For descriptions of each optical module and service processor included in ONU1, please refer to the description of the corresponding optical module in Figure 9 or Figure 12 , no details will be given. The dual ring network 1400 also includes an ONU4 connected to the OLT2. The ONU4 includes a service processor 1414. The service processor 1414 Connected to the optical module 1411, the optical module 1412 and the optical module 1413 respectively. The optical module 1411 is connected to ONU2. The optical module 1412 is connected to ONU3. The optical module 1413 is connected to the OLT2. For a description of each optical module and service processor included in the ONU4, please refer to the description of the corresponding optical module in Figure 9 or Figure 12, and the details will not be repeated. It should be noted that this embodiment takes the communication device including three optical modules to form a dual-ring network as an example. This embodiment does not limit the specific type of network. It can be understood that the type of optical communication network provided in this embodiment can be any type such as ring networking, dual ring networking, or tree networking, and is not specifically limited. This embodiment shows that flexible networking of any shape can be realized, which reduces the difficulty of adding subsequent communication nodes to the network and improves the subsequent scalability of the network.

The communication device shown in this embodiment may also include a detector and a switch array as shown in Figure 9 or Figure 12. For specific description, please refer to the corresponding description of Figure 9 or Figure 12, and no further details will be given.

As mentioned above, the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still make the foregoing technical solutions. The technical solutions described in each embodiment may be modified, or some of the technical features may be equivalently replaced; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions in each embodiment of the present application.

Claims

A registration method, characterized in that the method includes:

The first communication node receives a registration request message from the second communication node, the registration request message is used to measure the first round-trip communication delay RTT between the central office device and the second communication node;

The first communication node carries the registration request message on a target time slot of the upstream data stream, the target time slot being indicated by the central office device;

The first communication node sends the uplink data stream to the central office device.
The method according to claim 1, characterized in that before the first communication node sends the uplink data stream to the central office device, the method further includes:

The first communication node measures a second RTT between the first communication node and the second communication node according to the registration request message;

The first communication node carries the second RTT on the target time slot.
The method according to claim 1 or 2, characterized in that before the first communication node receives the registration request message from the second communication node, the method further includes:

The first communication node sends a registration trigger message to the second communication node, where the registration trigger message is used to instruct the second communication node to send the registration request message.
The method according to claim 3, characterized in that before the first communication node sends a registration trigger message to the second communication node, the method further includes:

The first communication node receives a first downlink data stream from the central office device;

The first communication node copies the first downlink data stream to obtain a second downlink data stream;

The first communication node sending a registration trigger message to the second communication node includes:

The first communication node sends the second downlink data stream to the second communication node, where the second downlink data stream includes a target downlink data frame, and the target downlink data frame is used to carry the registration trigger message.
The method according to claim 4, characterized in that the registration trigger message is a target superframe number carried by the target downlink data frame.
The method according to claim 2, wherein the first communication node measuring the second RTT between the first communication node and the second communication node according to the registration request message includes:

The first communication node determines a first time, and the first time is the time when the first communication node sends a registration trigger message to the second communication node, and the registration trigger message is used to indicate the second communication The node sends the registration request message;

The first communication node determines a second time, and the second time is the time when the first communication node receives the registration request message;

The first communication node determines that the difference between the second time and the first time is the second RTT.
The method according to claim 3, characterized in that before the first communication node sends a registration trigger message to the second communication node, the method further includes:

The first communication node receives a third downlink data stream from the central office device;

The first communication node copies the third downlink data stream to obtain a fourth downlink data stream;

The first communication node adds the registration trigger message to the fourth downlink data stream to obtain fifth downlink data. flow;

The first communication node sending a registration trigger message to the second communication node includes:

The first communication node sends the fifth downlink data stream to the second communication node.
The method according to claim 2, wherein the first communication node measuring the second RTT between the first communication node and the second communication node according to the registration request message includes:

The first communication node determines a third time, and the third time is the time when the first communication node sends a first measurement message to the second communication node;

The first communication node determines a fourth time, and the fourth time is the time when the first communication node receives the second measurement message from the second communication node;

The first communication node determines that the difference between the fourth time and the third time is the second RTT.
The method according to any one of claims 1 to 8, characterized in that the first receiving port RX of the first communication node is connected to the central office equipment, and the second RX of the first communication node is connected to the central office equipment. The second communication node is connected, and before the first communication node receives the registration request message from the second communication node, the method further includes:

The first communication node switches the second RX among the first RX and the second RX as a receiving port for receiving the registration request message.
The method according to claim 9, characterized in that, among the first RX and the second RX, the first communication node switches the second RX to a receiving port for receiving the registration request message. Previously, the method also included:

The first communication node detects that the signal quality received via the first RX is better than the signal quality received via the second RX.
The method according to claim 9, characterized in that, among the first RX and the second RX, the first communication node switches the second RX to a receiving port for receiving the registration request message. Previously, the method also included:

The first communication node detects a failure event in the optical signal received via the second RX.
The method according to any one of claims 1 to 11, characterized in that the method is applied to an optical communication system, the optical communication system includes the central office device and a plurality of devices connected to the central office device in sequence. Communication node; the first communication node and the second communication node are two different communication nodes among the plurality of communication nodes, and the first communication node is connected between the central office equipment and the second communication node. between communication nodes.
A registration method, characterized in that the method includes:

The central office equipment receives the uplink data stream from the first communication node;

The central office device obtains the registration request message carried on the target time slot of the upstream data stream, wherein the registration request message comes from the second communication node, and the target time slot is indicated by the central office device;

The central office device measures a first round-trip communication delay RTT between the central office device and the second communication node according to the registration request message.
The method according to claim 13, characterized in that after the central office device receives the uplink data stream from the first communication node, the method further includes:

The central office device obtains a second RTT between the first communication node and the second communication node that has been carried on the target time slot;

The central office device measuring the first round-trip communication delay RTT between the central office device and the second communication node according to the registration request message includes:

The central office device measures the first RTT based on the second RTT and the registration request message.
The method according to claim 14, characterized in that before the central office device measures the first RTT according to the second RTT and the registration request message, the method further includes:

The central office device obtains a third RTT, and the third RTT is the RTT between the central office device and the first communication node;

The central office device measuring the first RTT according to the second RTT and the registration request message includes:

The central office device determines that the sum of the second RTT and the third RTT is the first RTT.
The method of claim 15, wherein obtaining the third RTT by the central office device includes:

The central office device obtains the identity of the first communication node on which the uplink data stream has been carried;

The central office device obtains the corresponding third RTT according to the identification of the first communication node.
A registration method, characterized in that the method includes:

The second communication node receives the registration trigger message from the first communication node;

The second communication node sends a registration request message to the first communication node according to the registration trigger message. The registration request message is used to measure the first round-trip communication time between the central office device and the second communication node. Extended RTT.
The method according to claim 17, wherein the second communication node receiving the registration trigger message from the first communication node includes:

The second communication node receives a second downlink data stream from the first communication node, the second downlink data stream includes a target downlink data frame, and the registration trigger message is a target carried by the target downlink data frame. Superframe number.
The method according to claim 17, wherein the second communication node receiving the registration trigger message from the first communication node includes:

The second communication node receives a fifth downlink data stream from the first communication node, and the fifth downlink data stream carries the registration trigger message.
A communication node, characterized in that the communication node includes a transceiver and a service processor, and the transceiver is connected to the service processor;

The transceiver is configured to receive a registration request message from another communication node, and the registration request message is used to measure the first round-trip communication delay RTT between the central office device and the another communication node;

The service processor is configured to carry the registration request message on a target time slot of the upstream data stream, and the target time slot is indicated by the central office device;

The transceiver is also used to send the uplink data stream to the central office device.
A central office device, characterized in that the central office device includes a transceiver and a service processor, and the transceiver is connected to the service processor;

The transceiver is configured to receive an uplink data stream from the first communication node;

The service processor is configured to obtain the registration request message carried on the target time slot of the uplink data stream, wherein the registration request message comes from the second communication node, and the target time slot is indicated by the central office device, The service processor is further configured to measure the first round-trip communication delay RTT between the central office device and the second communication node according to the registration request message.
A communication node, characterized in that the communication node includes a transceiver and a service processor, and the transceiver is connected to the service processor;

The transceiver is configured to receive a registration trigger message from another communication node;

The service processor is configured to send a registration request message to the other communication node according to the registration trigger message, so The registration request message is used to measure the first round-trip communication delay RTT between the central office device and the second communication node.
An optical communication system, characterized in that the optical communication system includes a central office device, a first communication node and a second communication node connected in sequence;

The first communication node is configured to send a registration trigger message to the second communication node;

The second communication node is configured to send a registration request message to the first communication node according to the registration trigger message;

The first communication node is configured to carry the registration request message on a target time slot of the upstream data stream, and the target time slot is indicated by the central office device;

The first communication node is configured to send the uplink data stream to the central office device;

The central office device is configured to obtain the registration request message carried by the uplink data stream;

The central office device is configured to measure a first round-trip communication delay RTT between the central office device and the second communication node according to the registration request message.