WO2024045814A1

WO2024045814A1 - Data transmission method, related device and optical communication system

Info

Publication number: WO2024045814A1
Application number: PCT/CN2023/102548
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: CN117676394A

Abstract

Disclosed in the present application are a data transmission method, a related device and an optical communication system, which are used for reducing the time delay and time delay jitter of data transmission in networking and increasing the efficiency of data transmission. The method comprises: a first communication node receiving a first uplink data stream from a second communication node, wherein an uplink service of the second communication node occupies a first time slot of the first uplink data stream, and the first time slot is indicated by a central office device; the first communication node carrying an uplink service of the first communication node in a second time slot of the first uplink data stream to obtain a second uplink data stream, wherein the second time slot is indicated by the central office device, and the first time slot is different from the second time slot; and the first communication node sending the second uplink data stream to the central office device.

Description

A data transmission method, related equipment and optical communication system

This application requires the priority of a Chinese patent application submitted to the State Intellectual Property Office of China on August 31, 2022, with application number 202211058808.6 and the application title "A data transmission method, related equipment and optical communication system", and its entire content has been approved This reference is incorporated into this application.

Technical field

This application relates to the field of optical fiber communications, and in particular to a data transmission method, related equipment and optical communication systems.

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.

Each communication node sends uplink data to the CO device based on a competition mechanism. For example, communication node 1 needs to send the first uplink data to the first CO device, and communication node 2 needs to send the second uplink data to the first CO device. The first CO device, communication node 1 and communication node 2 are connected in sequence. Communication node 2 sends the second uplink data to communication node 1. If the time slot occupied by the first uplink data in the data stream overlaps with the time slot occupied by the second uplink data in the data stream, the communication node 1 needs to determine the time slot occupied by the first uplink data in the data stream. The time slots and the time slots occupied by the second uplink data in the data stream are rearranged. For another example, the communication node 1 discards at least part of the first uplink data and/or discards at least part of the second uplink data.

It can be seen that the communication node 1 rearranges the time slots of the first upstream data stream and the second upstream data stream or discards the data to ensure that the data stream sent by the communication node 1 to the CO device is not occupied by the first upstream data. The time slot coincides with the time slot occupied by the second uplink data. However, time slot rearrangement will increase the delay of data transmission and worsen delay jitter, and lost data will trigger data retransmission, reducing the efficiency of data transmission.

Contents of the invention

Embodiments of the present application provide a data transmission method, related equipment and an optical communication system, which are used to reduce the delay and delay jitter of network transmission data and improve the efficiency of data transmission.

The first aspect of the embodiment of the present application provides a data transmission method. The method includes: a first communication node receives a first uplink data stream from a second communication node, and the uplink service of the second communication node occupies the first communication node. A first time slot of the upstream data stream, the first time slot is indicated by the central office equipment; the first communication node carries the first communication node’s message on the second time slot of the first upstream data stream. For uplink services, a second uplink data stream is obtained, the second time slot is indicated by the central office equipment, the first time slot is different from the second time slot; the first communication node transmits data to the central office The device sends the second upstream data stream.

Using the method shown in this aspect, the time slots for each communication node included in the network to send uplink services are determined by the central office equipment. Instruction and control, there is no time overlap between the time slots indicated by the central office equipment, which avoids the possibility of conflicts in the time slots indicated by the central office equipment for different communication nodes. Since each communication node does not need to rearrange the time slots carrying uplink services from different communication nodes or delete the uplink services, it is ensured that the delay jitter of the uplink services sent by each communication node will not deteriorate. It reduces the probability of retransmission of uplink services sent by each communication node, effectively ensuring the transmission quality and transmission bandwidth of the ring network.

Based on the first aspect, in an optional implementation manner, the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream, and obtains the second uplink data Before the flow, the method further includes: the first communication node receiving a first time slot scheduling message from the central office device, the first time slot scheduling message being used to indicate the first time slot and the the second time slot; the first communication node copies the first time slot scheduling message to obtain the second time slot scheduling message; the first communication node sends the second time slot scheduling message to the second communication node information.

Using this implementation method, the first communication node can send the time slot scheduling message to the downstream second communication node in time, which reduces the delay of the first communication node sending the time slot scheduling message to the second communication node.

Based on the first aspect, in an optional implementation manner, the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream, and obtains the second uplink data The flow includes: the first communication node replaces the filling information carried on the second time slot with the uplink service of the first communication node to obtain a second uplink data stream.

Using this implementation method, the uplink data stream carrying the uplink service is a data stream with continuous signals, which enables the first communication node to directly carry its own uplink service in the uplink data stream from the second communication node, reducing the impact on each communication node. The power and performance requirements of the optical signals processed by the optical modules of the communication nodes reduce the complexity of each optical module processing the upstream data flow and improve the efficiency of the optical module in processing the upstream data flow.

Based on the first aspect, in an optional implementation manner, the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream, and obtains the second uplink data Before the flow, the method further includes: the first communication node determining that the third time slot of the first uplink data flow has carried valid uplink service, and the valid uplink service is the uplink service from another communication node, The third time slot is at least part of the second time slot; the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream. , obtaining the second uplink data stream includes: the first communication node replaces the effective uplink service with the uplink service of the first communication node, and obtains the second uplink data stream.

With this implementation, at least part of the second time slot indicated by the central office device to the first communication node is occupied by valid uplink services, and the first communication node can replace the valid uplink services carried on the third time slot with the first The uplink service of the communication node is to ensure that the first communication node successfully sends the uplink service of the first communication node to the central office equipment.

Based on the first aspect, in an optional implementation manner, before the first communication node sends the second uplink data stream to the central office device, the method further includes: the first communication node The third time slot carries a first indication message, and the first indication message is used to indicate that the first communication node has replaced the effective uplink service with the uplink service of the first communication node.

Using this implementation, if the first communication node determines that the third time slot has carried valid uplink services, the first communication node sends the first indication message to the central office device, so that the central office device can determine that the first communication node has carried The valid uplink service carried on the third time slot is replaced with the uplink service of the first communication node. The central office equipment can detect whether an error occurs in the second time slot indicated by the central office equipment for the first communication node based on the first indication message, thereby avoiding each communication node included in the ring network from sending uplink service occupation errors to the central office equipment. The probability of the time slot.

Based on the first aspect, in an optional implementation manner, the third time slot is part of the second time slot, and the first communication node Carrying the uplink service of the first communication node on the time slot, and obtaining the second uplink data stream includes: the first communication node carries the first communication node's service on the fourth time slot of the first uplink data stream. The uplink service obtains the second uplink data stream, and the fourth time slot is a time slot in the second time slot that is not occupied by the effective uplink service.

Using this implementation, when the central office equipment indicates that the part of the second time slot indicated by the first communication node is occupied by effective uplink services, the first communication node can carry the first communication node on the fourth time slot of the first uplink data stream. uplink service to ensure that the first communication node successfully sends the uplink service of the first communication node to the central office equipment.

Based on the first aspect, in an optional implementation manner, before the first communication node sends the second uplink data stream to the central office device, the method further includes: the first communication node The fourth time slot carries a second indication message, and the second indication message is used to indicate that the first communication node has carried the uplink service of the first communication node on the fourth time slot.

Using this implementation, if the first communication node has carried the uplink service of the first communication node on the fourth time slot, the first communication node sends the second indication message to the central office equipment, so that the central office equipment can determine the first The communication node has carried the uplink service of the first communication node on the fourth time slot. The central office equipment can detect whether an error occurs in the second time slot indicated by the central office equipment for the first communication node based on the second indication message, thereby avoiding each communication node included in the ring network from sending uplink service occupation errors to the central office equipment. The probability of the time slot.

Based on the first aspect, in an optional implementation manner, the first communication node sending the second uplink data stream to the central office device includes: the first communication node obtains the second uplink data stream The first time slot corresponding relationship includes the corresponding relationship between the first time slot and the communication node identifier carried by the first time slot; the first communication node obtains the second time slot Slot correspondence, the second time slot correspondence is the correspondence between the first time slot indicated by the central office equipment and the second communication node identifier; if the first communication node determines the first If the time slot corresponding relationship is the same as the second time slot corresponding relationship, the first communication node sends the second uplink data stream to the central office device.

Using this implementation, the first communication node can detect whether the time slots occupied by the uplink services of each communication node included in the ring network in the second uplink data stream are accurate, and determine the uplink service of any communication node at the first communication node. When the service occupies errors in the second upstream data stream, the first communication node can notify the central office device of the time slot occupancy error event to ensure that each communication node in the ring network transmits the upstream data stream. Each communication node can send uplink services according to the time slot indicated by the central office equipment, effectively ensuring the transmission quality and efficiency of the ring network.

Based on the first aspect, in an optional implementation manner, after the first communication node obtains the second time slot correspondence, the method further includes: if the first communication node determines that the first time slot correspondence is If the second time slot correspondence is different, the first communication node sends the first time slot correspondence to the central office device.

Using this implementation, the first communication node can detect an error in the time slot occupied by the uplink service of at least one communication node included in the ring network in the second uplink data stream, and determine the time slot of any communication node at the first communication node. When the uplink service occupies an error in the second uplink data stream, the first communication node may send the first time slot correspondence to the central office device to notify the occurrence of the time slot occupancy error.

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 first uplink data stream from the second communication node, the method further includes: the first communication node Among the first RX and the second RX, the second RX is switched to a receiving port for receiving the first upstream data stream.

Using this implementation method, the first communication node can select one central office device to transmit uplink and downlink services among two or more connected central office devices, thereby improving the success rate of uplink and downlink service transmission.

Based on the first aspect, in an optional implementation manner, the first communication node switches the second RX to receive the first uplink data stream among the first RX and the second RX. Before the receiving port, the method further includes: 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.

Using this implementation, the first communication node selects central office equipment for uplink and downlink service transmission based on signal quality, which improves the quality of communication between the communication node and the central office equipment.

Based on the first aspect, in an optional implementation manner, the first communication node switches the second RX between the first RX and the second RX to receive the first uplink data stream. Before the receiving 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 method, when the second RX of the communication node fails, the communication node can switch to a state of performing uplink and downlink services with the central office equipment, which improves the successful transmission of uplink and downlink services.

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 is connected between the central office equipment and the second communication node.

The second aspect of the embodiment of the present application provides a data transmission method. The method includes: the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream, and obtains the first uplink service. Data flow, the first time slot is indicated by the central office equipment; the second communication node sends the first uplink data flow to the first communication node.

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, before the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data flow according to the second time slot scheduling message, The method further includes: the second communication node receiving the initial upstream data flow.

Based on the second aspect, in an optional implementation manner, the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream, and before obtaining the first uplink data stream, The method also includes:

The second communication node receives the initial upstream data stream.

The second communication node generates the initial upstream data stream.

The second communication node receives a second time slot scheduling message from the first communication node, and the second time slot scheduling message is used to indicate the first time slot.

Based on the second 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 is connected between the central office equipment and the second communication node.

The third aspect of the embodiments of the present application provides a data transmission method. The method includes: a first communication node receives a first downlink data stream from a central office device, and the first downlink data stream has carried downlink services; the first communication node Copy the first downlink data stream to obtain a second downlink data stream; the first communication node obtains the downlink service carried by the first downlink data stream; the first communication node sends a message to the second communication node The second downstream data stream.

Using the method shown in this aspect, when the first communication node receives the first downlink data stream, it first copies the first downlink data stream to obtain the second downlink data stream, because the first communication node does not need to execute the process from the first downlink data stream. The related operations of obtaining downlink services for a downlink data stream effectively reduce the delay of the first communication node sending the second downlink data stream to the second communication node, ensuring that each communication node included in the ring network obtains downlink services. Timeliness.

Based on the third aspect, in an optional implementation manner, after the first communication node receives the first downlink data stream from the central office device, the method further includes: the first communication node obtains the first A first time slot scheduling message that has been carried by a downlink data stream. The first time slot scheduling message is used to indicate a first time slot. The uplink service of the first communication node occupies the first time slot of the uplink data stream. gap.

Based on the third 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, the first communication node receives the first downlink data stream from the central office equipment, and before the first downlink data stream has carried downlink services, the method further includes: the first communication node Among the first RX and the second RX, the first RX is switched to a receiving port for receiving the first downlink data stream.

Based on the third aspect, in an optional implementation manner, the first communication node switches the first RX to receive the first downlink data among the first RX and the second RX. Before the receiving port of the flow, 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.

Based on the third aspect, in an optional implementation manner, the first communication node switches the first RX to receive the first downlink data among the first RX and the second RX. Before the receiving port of the flow, the method further includes: the first communication node detects a failure event in the optical signal received via the second RX.

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. The first uplink data stream, the uplink service of the second communication node occupies the first time slot of the first uplink data stream, and the first time slot is indicated by the central office equipment; the service processor is configured to The second time slot of the first uplink data stream carries the uplink service of the communication node to obtain the second uplink data stream. The second time slot is indicated by the central office equipment, and the first time slot is different from the first time slot. the second time slot; the transceiver is also used to send the second upstream data stream to the central office equipment.

The fifth 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 service processor is used to perform initial processing of the upstream data flow. The first time slot carries the uplink service of the communication node to obtain the first uplink data stream. The first time slot is indicated by the central office equipment; the transceiver is used to send the first time slot to another communication node. Upstream data flow.

For an explanation of the beneficial effects in this aspect, please refer to the second aspect, and the details will not be repeated.

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 third signal from a central office device. A downlink data stream, the first downlink data stream has carried downlink services; the service processor is used to copy the first downlink data stream to obtain a second downlink data stream; the service processor is used to obtain the The downlink service carried by the first downlink data flow; the receiving The transmitter is used to send the second downlink data stream to the other communication node.

For an explanation of the beneficial effects in this aspect, please refer to the third aspect, and the details will not be repeated.

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 connected in sequence; the second communication node is used for initial uplink data processing. The first time slot of the stream carries the uplink service of the second communication node to obtain a first uplink data stream; the second communication node is used to send the first uplink data stream to the first communication node; The first communication node is configured to carry the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink data stream, the first time slot and the second The time slots are respectively indicated by the central office equipment, and the first time slot is different from the second time slot; the first communication node is used to send the second upstream data stream to the central office equipment.

The eighth 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 connected in sequence; the central office device is configured to provide a signal to the first communication node. The communication node sends a first downlink data stream, and the first downlink data stream has carried downlink services; the first communication node is used to copy the first downlink data stream to obtain a second downlink data stream; The first communication node is used to obtain the downlink service carried by the first downlink data flow; the first communication node is used to send the second downlink data flow to the second communication node.

A ninth 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 diagram of the first structure of a ring network provided by existing solutions;

Figure 1b is a transmission example diagram of summarized uplink data provided by existing solutions;

Figure 1c shows another example of transmission of aggregated uplink data provided by existing solutions;

Figure 2 is a structural example diagram of a ring network provided by an embodiment of the present application;

Figure 3 is a first step flow chart of the data transmission method provided by the embodiment of the present application;

Figure 4 is an example diagram of the transmission of the first time slot scheduling message provided by the embodiment of the present application;

Figure 5 is an example structural diagram of a downlink data frame provided by the embodiment of the present application;

Figure 6 is a first structural example diagram of an uplink data flow provided by the application embodiment;

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

Figure 7b is a third step flow chart of the data transmission method provided by the embodiment of the present application;

Figure 8a is an example diagram of the second structure of the uplink data flow provided by the embodiment of the present application;

Figure 8b is a third structural example diagram of the uplink data flow provided by the embodiment of the present application;

Figure 8c is a fourth structural example diagram of the uplink data flow provided by the embodiment of the present application;

Figure 9 is a fourth step flow chart of the data transmission method provided by the embodiment of the present application;

Figure 10 is an example diagram of the structure of the downlink data flow provided by the embodiment of the present application;

Figure 11 is a transmission example diagram of a downlink data stream provided by an embodiment of the present application;

Figure 12 is an example diagram of the second structure of ring networking provided by existing solutions;

Figure 13 is a first structural example diagram of ONU1 provided by the embodiment of the present application;

Figure 14 is a fifth step flow chart of the data transmission method provided by the embodiment of the present application;

Figure 15 is a sixth step flow chart of the data transmission method provided by the embodiment of the present application;

Figure 16 is a second structural example diagram of ONU1 provided by the embodiment of the present application;

Figure 17 is a structural example diagram of a communication device provided by an embodiment of the present application;

Figure 18 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 diagram of the first structure of a ring network provided by existing solutions. 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 information 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 transmit data between each communication node and the upper layer network. Specifically, the first CO device 101 can act as a mediator between each communication node and the upper layer network. The first CO device 101 can forward downlink traffic received from the upper layer network to the corresponding communication node and forward uplink traffic received from each communication node 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 following describes the workflow of ring networking: taking the data sent by the first CO1 device 101 to the communication node as downlink data as an example, if the first CO device 101 sends downlink data to the communication node 2, such as sending a control command, etc., the first CO device 101 sends downlink data to the communication node 2. Device 101 sends downlink data to communication node 1 for communication node 2. When the communication node 1 receives the downlink data from the first CO device 101, the communication node 1 parses the downlink data and determines that the downlink data is sent to the communication node 2, then the communication node 1 continues to send the downlink data to the node 2. .

Taking the data sent by the communication node to the first CO device 101 as uplink data as an example, if the communication node N sends uplink data to the first CO device 101, the communication node N is connected between the communication node N and the first CO device 101 via The communication nodes send the uplink data in sequence. Specifically, communication node N sends uplink data to communication node N-1, and by analogy, communication node 1 sends the uplink data to the first CO device 101.

The process of each communication node sending uplink data to the CO device is based on a competition mechanism. Specifically, the communication node N-1 sends an uplink data stream to the first CO device, which aggregates the uplink data N sent by the communication node N to the first CO device 101 and the uplink data N- sent by the communication node N-1 to the first CO device 101. 1.

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 N-1, communication node 2 does not need to communicate through the link between communication node 2 and communication node N-1. Communication node 2 communicates with communication node 1 normally, The communication node 1 communicates with the first CO device 101 to ensure normal communication between the communication node 2 and the first CO device 101. The communication node N-1 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 N-1 and the second CO device 102. Moreover, since the first CO device 101 and the second CO device 102 are connected, the traffic 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 N-1 needs to send The traffic to the first CO device 101 can be forwarded by the second CO device 102 .

The following existing solutions illustrate two ways for the communication node N-1 to send the uplink data stream to the first CO device 101:

Existing method 1

Figure 1b is a transmission example diagram of summarized uplink data provided by existing solutions. The uplink service N sent by communication node N to communication node N-1 occupies time slot T1 in the uplink data stream. The starting time of time slot T1 is time t1, and the end time of time slot T1 is time t3. The uplink service N-1 that the communication node N-1 needs to send locally to the first CO device occupies the time slot T2. The starting time of the time slot T2 is time t2 and the end time is time t4. Among them, time t2 is greater than time t1 and less than time t3, and time t4 is greater than time t3. It can be seen that time slot T1 and time slot T2 overlap (that is, they overlap from time t2 to time t3). The communication node N-1 performs time slot rearrangement on the time slot T1 occupied by the uplink service N and the time slot T2 occupied by the uplink service N-1.

The uplink service N after the time slot rearrangement occupies the time slot T3, and the uplink service N-1 after the time slot rearrangement occupies the time slot T4. The starting time of time slot T3 is time t1, and the end time is time t3. The starting time of time slot T4 is time t3, and the end time is time t5. Time t3 is greater than time t2 and less than time t4, and time t5 is greater than time t4. It can be seen that there is no overlap in time slots between time slots T3 and T4 after time slot rearrangement, so as to ensure that there is no conflict between the transmission of uplink service N and the transmission of uplink service N-1.

However, using the existing method 1, the delay of the uplink service changes after the time slots are rearranged, which leads to the deterioration of service transmission delay and delay jitter. For example, if time slot rearrangement is not performed, uplink service N and uplink service N-1 occupy time slots from time t1 to time t4. After time slot rearrangement, uplink service N and uplink service N-1 occupy time slots from time t1 to time t4. At time t5, it can be seen that the time slot rearrangement has led to the deterioration of the uplink service delay after the rearrangement.

Already have method 2

Figure 1c shows another example of transmission of aggregated uplink data provided by existing solutions. The uplink service N sent by the communication node N to the communication node N-1 occupies the time slot T1 in the uplink data stream, and the uplink service N-1 that the communication node N-1 needs to send locally to the first CO device occupies the time slot T2. For descriptions of slot T1 and time slot T2, please refer to the above-mentioned method 1, and details will not be repeated. The communication node N-1 deletes part of the data of the uplink service N and/or deletes part of the data of the uplink service N-1. Communication node N-1 deletes part of the data of uplink service N-1, and the deleted uplink service N-1 Time slot T5 is occupied. The starting time of time slot T5 is time t3 and the end time is time t4. Time t4 is greater than time t3. It can be seen that there is no overlap in time slots between the uplink service N and the deleted uplink service N-1, so as to ensure that there is no conflict between the transmission of the uplink service N and the transmission of the uplink service N-1.

However, using the existing method 2, deleting the data will lead to retransmission of the data. For example, deleting part of the data of the uplink service N-1 will cause the communication node N-1 to retransmit the deleted data to the first CO device 101. data. If the number of communication nodes included in the ring network increases, the data transmission quality and transmission bandwidth will be greatly degraded.

This application provides a data transmission method that can reduce the delay and delay jitter of the communication node sending services to the CO device, and can also reduce the probability of service retransmission. The method shown in this embodiment is applied to ring networking. This embodiment does not limit the application scenarios of ring networking. For example, ring networking is used for optical transport network (OTN), industrial control, and data return. Transmission, data center and monitoring center, etc., there are no specific restrictions. For the description of the ring networking structure, please refer to the description of Figure 1a, and the details will not be repeated. This embodiment does not limit the device types 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, etc., 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 switch, and the communication node can be a terminal device such as a surveillance camera. For another example, the CO equipment included in the ring network can be an optical line terminal (OLT), and the communication node can be an optical network unit (ONU).

The ring networking applied in this application can be seen in Figure 2, where Figure 2 is a structural example diagram of the ring networking provided by the embodiment of this application. The ring network 200 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 200 shown in this embodiment, any two adjacent ONUs do not need to be connected through an optical splitter, and there is no need to use an optical splitter between OLT1 and the adjacent ONU (ie, ONU1 shown in Figure 2). connection, OLT2 and the adjacent ONU (that is, ONU2 shown in Figure 2) 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 and OLT1 are directly connected, the communication delay between OLT1 and ONU1 is effectively reduced. Moreover, since the ring network does not require the layout of optical splitters, the deployment difficulty of the ring network is reduced, the deployment efficiency is improved, and the ring network cost is reduced. Insertion loss of the network. 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, etc.

Based on the ring networking shown in Figure 2, the execution process of the data transmission method provided by the embodiment of the present application will be described below in conjunction with Figure 3, where Figure 3 is the first step of the data transmission method provided by the embodiment of the present application. flow chart.

Step 301: OLT1 sends the first time slot scheduling message to ONU1.

The OLT1 shown in this embodiment sends the first time slot scheduling message to the ONU1 directly connected to the OLT1 based on dynamic bandwidth assignment (DBA).

Step 302: ONU1 copies the first time slot scheduling message and obtains the second time slot scheduling message.

Figure 4 is an example diagram of the transmission of the first time slot scheduling message provided by the embodiment of the present application. After ONU1 receives the first time slot scheduling message from OLT1, ONU1 performs photoelectric conversion on the first time slot scheduling message and obtains the first time slot scheduling message in the form of an electrical signal. ONU1 copies the first time slot scheduling message and obtains the second time slot scheduling message.

The first time slot scheduling message is the same as the second time slot scheduling message. The first time slot scheduling message is processed by ONU1. ONU1 performs electro-optical conversion on the second time slot scheduling message, and obtains the converted second time slot scheduling message in the form of an optical signal. ONU1 sends the second time slot scheduling message to ONU2 via the optical fiber connected between ONU1 and ONU2. It should be noted that the first time slot scheduling message and the second time slot scheduling message shown in this embodiment are two identical time slot scheduling messages. The first time slot scheduling message and the second time slot scheduling message are only the same. The distinction between the two time slot scheduling messages is not limited. For example, ONU1 may also process the second time slot scheduling message, and ONU1 sends the first time slot scheduling message to ONU2. The following describes the process of ONU1 processing the first time slot scheduling message:

Figure 5 is an example structural diagram of a downlink data frame provided by an embodiment of the present application. The downlink data frame 500 includes a physical synchronization block (PSBd) 501 and a physical layer frame payload (physical layer frame payload) 502. PSBd501 includes fields physical synchronization (PSync) field 511, superframe counter (superframe counter, SFC) field 512, operation control (operation control, OC) field 513 and upstream bandwidth map (upstream bandwidth map, US BWmap) field 514 .

Among them, the Psync field 511 is a physical layer synchronization field, which can be used to carry downlink frame synchronization indicator symbols. The SFC field 512 is used to carry the superframe number. The superframe number carried by the SFC field 512 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 514 is the first time slot scheduling message shown in this embodiment. Specifically, the US BWmap field 514 includes N allocation structures (Allocation Structure). Each Allocation Structure includes a bandwidth allocation identifier (allocation identifier, Alloc-ID) field 521, a slot start time (start time) field 522, and a grant size (Grant size) field 523. Take the Allocation ID1 field as an example. The Allocation ID1 field is used to carry the identifier (Identity, ID) of ONU1 authorized to send. The start time field is used to indicate the starting time of the time slot allocated by OLT1 to ONU1. The Grant size field 523 is used to Indicates the length of the time slot granted to ONU1. The Allocation ID2 field is used to indicate the field allocated to ONU2 for OLT1, and so on. The Allocation IDN field is the field allocated by OLT1 to ONUN. For the description of each Allocation ID field, please refer to the description of the Allocation ID1 field. The details will not be repeated.

When ONU1 receives the downlink data frame 500, the Alloc-ID1 field carries the identification (ID) of ONU1, and ONU1 obtains Allocation Structure1 including Alloc-ID1 from the downlink data frame 500. ONU1 performs a cyclic redundancy check (CRC) check on the received Allocation Structure1. If the verification result is correct, ONU1 obtains the second time slot. The starting time of the second time slot is the start time included in the Allocation Structure1 field that ONU1 has obtained, and the duration of the second time slot is the Grant size included in the Allocation Structure1 field. In order to enable each ONU to send services to OLT1 If no conflict occurs, there is no overlap between the time slots indicated by OLT1 for each ONU (that is, there is no overlap between time slots as shown in Figure 1a and Figure 1b). For example, among the multiple time slots indicated by OLT1, there is a guard time between any two adjacent time slots. The description of the downlink data frame 500 in this embodiment is optional and not limiting, as long as each ONU included in the ring network can obtain the corresponding time slot according to the downlink data frame 500 . For example, each Allocation Structure1 field may include an end time, and the end time is used to indicate the end time of the second time slot.

Step 303: ONU1 sends the second time slot scheduling message to ONU2.

ONU2 receives the second time slot scheduling message and processes the second time slot scheduling message. For the process of ONU2 processing the second time slot scheduling message, please refer to the process of ONU1 processing the first time slot scheduling message. The details will not be repeated. . If ONU2 is connected to ONU3, ONU2 copies the second time slot scheduling message and obtains the third time slot scheduling message, and ONU2 sends the third time slot scheduling message to ONU3. For instructions on how ONU2 sends the third time slot scheduling message to ONU3, please refer to the process of ONU1 sending the second time slot scheduling message to ONU2, which will not be described in detail. It can be understood that when the ring network includes N ONUs, each ONU copies the time slot scheduling message from the upstream and forwards it to the downstream ONU until each ONU included in the ring network receives the time slot scheduling message from OLT1 time slot scheduling message. When each ONU receives the time slot scheduling message, each ONU sends uplink services to OLT1 based on the time division multiple access (TDMA) mechanism.

In this embodiment, the time slot scheduling message received by each ONU included in the ring network is taken as an example. The time slot scheduling message received by each ONU included in the ring network comes from OLT1. In other examples, the time slot scheduling message received by each ONU included in the ring network can also come from OLT2. . For another example, among the N ONUs included in a ring network, the time slot scheduling messages received by some ONUs come from OLT1, while the time slot scheduling messages received by other ONUs come from OLT2. There is no specific limit, as long as the ring is ensured It is sufficient that each ONU included in the network receives the time slot scheduling message.

Step 304: ONU2 sends the first upstream data stream to ONU1.

First, ONU2 needs to obtain the initial upstream data flow.

The initial upstream data flow is from the downstream ONU connected to ONU2. For example, if ONU3 is also connected between ONU2 and OLT2, ONU2 receives the initial upstream data stream from ONU3. ONU3 shown in this embodiment receives the above-mentioned third time slot scheduling message from ONU2. The third time slot scheduling message is used to indicate the time slot occupied by the uplink service for carrying ONU3. The initial upstream data flow shown in this embodiment is a continuous data flow. If ONU3 does not need to send uplink services to OLT1, the initial upstream data flow is a continuous data flow that already carries filling information. If ONU3 has uplink services that need to be sent to OLT1, the initial upstream data stream includes time slots that carry filling information and time slots that carry ONU3's uplink services. Among them, the filling information can be a regular or random byte string.

For example, in the case where the ring network includes three ONUs, namely ONU1, ONU2, and ONU3, the third time slot scheduling message includes an Allocation Structure1 field, an Allocation Structure2 field, and an Allocation Structure3 field. The start time included in the Allocation Structure1 field is TS1 and the Grant size is L1. The start time included in the Allocation Structure2 field is TS2 and the Grant size is L2. The Allocation Structure3 field includes a start time of TS3 and a Grant size of L3. Furthermore, time TS1 is the earliest time among TS1, TS2, and TS3. It can be understood that each ONU included in the ring network (i.e. The upstream services that ONU1, ONU2 and ONU3 shown in this example need to be sent to OLT1 can all be carried in this initial upstream data stream.

This initial upstream data flow can also come from OLT2. For example, if ONU3 is also connected between ONU2 and OLT2, OLT2 generates the initial upstream data stream, and OLT2 sends the initial upstream data stream to ONU3. The details will not be described again. If in the ring network shown in this embodiment, the last ONU that interacts with OLT1 in uplink and downlink services is ONU2, then ONU2 generates the initial upstream data flow. For the description of the initial upstream data flow, please refer to ONU3 shown above. The instructions for generating the initial upstream data stream will not be described in detail.

Secondly, ONU2 determines the first time slot according to the second time slot scheduling message. For an explanation of the process of ONU2 obtaining the first time slot according to the second time slot scheduling message in this embodiment, please refer to the process of ONU1 obtaining the second time slot according to the first time slot scheduling message shown above. The details will not be described again. . Figure 6 is a diagram illustrating a first structural example of an uplink data flow provided by an embodiment of the application. For example, the start time of the time slot indicated by Allocation Structure1 is time t1, and the end time of the time slot is time t2. The starting time of the time slot indicated by Allocation Structure2 is time t3, and the end time of the time slot is time t4. Among them, time t1, time t2, time t3 and time t4 increase in sequence. Alloc-ID2 included in Allocation Structure2 corresponds to ONU2, and ONU2 determines the first time slot based on Allocation Structure2. Among them, the starting time of the first time slot is the starting time of the time slot included in Allocation Structure2, and the end time of the first time slot is the end time of the time slot indicated by Allocation Structure2. It can be understood that in the example shown in Figure 6, the starting time of the first time slot is time t3, and the end time of the first time slot is time t4. In this embodiment, there is a certain time interval between time t2 and time t3 as an example, and the time between time t2 and time t3 is the protection time shown in step 302. In other examples, time t2 and time t3 may also be the same time, which is not limited in this embodiment. It can be understood that in order to avoid overlapping of time slots in the uplink services sent by different ONUs to OLT1, there is no time overlap between time slots corresponding to different ONUs in the second time slot scheduling message.

Again, ONU2 carries the uplink service of ONU2 on the first time slot of the initial upstream data stream 601, and obtains the first upstream data stream 602. The first upstream data stream shown in this embodiment is a data stream with continuous signals. To this end, ONU2 carries filling information on the idle time slots of the first upstream data stream. The idle time slots are different from the first time slots. . In the example shown in Figure 6, the starting time of the idle time slot is time t1 and the end time is time t3. Optionally, when ONU2 in this embodiment obtains the first upstream data stream, ONU2 can perform forward error correction (FEC) encoding on the first upstream data stream to send it to ONU1 The first upstream data stream after FEC encoding. FEC encoding encodes the first upstream data stream so that the receiving end (ONU1) can directly detect errors in data transmission from the FEC-encoded first upstream data stream and correct transmission errors to a certain extent. Using FEC coding can reduce the bit error rate and save the transmission power of ONU2 in sending the first upstream data stream to ONU1 under the same reception result.

After ONU2 in this embodiment obtains the first upstream data stream, ONU2 performs electro-optical conversion on the first upstream data stream to send the first upstream data stream to ONU1 via the optical fiber connected between ONU2 and ONU1.

Step 305: ONU1 sends the second upstream data stream to OLT1.

First, ONU1 obtains the second time slot according to the first time slot scheduling message. Among them, the second time slot is the time slot occupied by the uplink service of ONU1. Alloc-ID1 of Allocation Structure1 carrying the first time slot scheduling message corresponds to ONU1. ONU1 determines the second time slot based on Allocation Structure1. Among them, the start time of the second time slot moment is the start time of the time slot included in Allocation Structure1, and the end time of the second time slot is the end time of the time slot indicated by Allocation Structure1. It can be understood that in the example shown in Figure 6, the starting time of the second time slot is time t1, and the end time of the second time slot is time t2.

Secondly, after receiving the first upstream data stream 602, ONU1 performs photoelectric conversion on the first upstream data stream to obtain the first upstream data stream 602 in the form of an electrical signal. It can be seen from step 304 that ONU2 has carried filling information on the second time slot in the first upstream data stream. For this reason, when ONU1 detects that OLT1 has carried filling information on the second time slot indicated by ONU1 , ONU1 replaces the filling information carried on the second time slot with the uplink service of ONU1, and obtains the second uplink data stream 603.

Optionally, if the first upstream data stream is the FEC-encoded upstream data stream of ONU2, before ONU1 obtains the second upstream data stream 603, ONU1 first performs FEC decoding on the first upstream data stream, and ONU1 performs FEC decoding on the first upstream data stream based on the FEC decoding of the first upstream data stream can detect errors occurring in data transmission in the first upstream data stream, and can correct transmission errors. ONU1 obtains the second upstream data stream based on the FEC-decoded first upstream data stream.

After ONU1 in this embodiment obtains the second upstream data stream, it performs electro-optical conversion on the second upstream data stream to send the second upstream data stream to OLT1 via the optical fiber connected between ONU1 and OLT1.

Step 306: OLT1 receives the second upstream data stream.

When OLT1 receives the second upstream data stream, OLT1 can obtain the upstream service of ONU1 from the second time slot of the second upstream data stream. OLT1 can also obtain the upstream service of ONU2 from the first time slot of the second upstream data stream.

The optical module of OLT1 shown in this embodiment receives the second upstream data stream. Since the second upstream data stream shown in this embodiment is a data stream with continuous signals, the optical module of OLT1 is an optical module that can receive continuous signals. , there is no need to receive uplink data frames that are transmitted in bursts, which effectively reduces the performance requirements of the optical module of OLT1. Moreover, the optical module of OLT1 performs photoelectric conversion on the continuous second upstream data stream, which greatly reduces the complexity of OLT1's optical module processing the second upstream data stream and improves the efficiency of OLT1's optical module processing the second upstream data stream. . OLT1 can process the second upstream data stream of the electrical signal to obtain the upstream services of ONU1 and the upstream services of ONU2 carried in the second upstream data stream.

Using the method shown in this embodiment, each ONU in the ring network carries its own uplink service on the time slot indicated by OLT1. For example, ONU2 shown above carries the uplink service of ONU2 on the first time slot allocated by OLT1. It can be understood that each ONU included in the ring network sends uplink services based on TDMA transmission, that is, the time slots for each ONU to send uplink services are allocated and controlled by OLT1. There is no time overlap between the various time slots indicated by OLT1, which avoids The time slots indicated by the OLT for different ONUs may conflict. Moreover, it avoids the uncertainty of time slots carrying each uplink service caused by each ONU in the ring network sending uplink services based on the competition mechanism. Since each ONU sends its own uplink services based on TDMA, each ONU does not need to rearrange the time slots carrying uplink services from different ONUs or delete the uplink services, ensuring that the delay jitter of the uplink services sent by each ONU will not Deterioration occurs. It reduces the probability of retransmission of the uplink services sent by each ONU, effectively ensuring the transmission quality and transmission bandwidth of the ring network. Each ONU transmits uplink services based on the time slot indicated by OLT1, which improves the controllability and transmission efficiency of uplink service transmission.

Since the upstream data stream carrying the uplink service shown in this embodiment is a data stream with continuous signals, the upstream ONU (for example, ONU1) can directly carry its own upstream service on the upstream data stream from the downstream ONU (for example, ONU2). It reduces the power and performance requirements for the optical signals processed by the optical modules of each ONU and the OLT, reduces the complexity of each optical module processing the upstream data flow, and improves the efficiency of the optical module in processing the upstream data flow.

Since the method shown in this embodiment is applied to a ring network, if the ring network needs to be expanded, a new node can be added between any two nodes included in the ring network, which reduces the difficulty of expanding the ring network. Improved the scalability of ring networking.

Figure 7a is a second step flow chart of the data transmission method provided by the embodiment of the present application. The data transmission method shown in this embodiment illustrates the process of how ONU1 sends the uplink service of ONU1 to OLT1 when the time slot indicated by OLT1 for ONU1 has been occupied by other valid uplink services.

Step 701: OLT1 sends the first time slot scheduling message to ONU1.

Step 702: ONU1 copies the first time slot scheduling message and obtains the second time slot scheduling message.

Step 703: ONU1 sends the second time slot scheduling message to ONU2.

Step 704: ONU2 sends the first upstream data stream to ONU1.

For an explanation of the execution process of steps 701 to 704 shown in this embodiment, please refer to the corresponding steps 301 to 304 shown in Figure 3, and the specific execution process will not be described again.

Step 705: ONU1 detects whether the third time slot has been occupied by valid uplink services.

ONU1 determines the second time slot according to the first time slot scheduling message, and the process of ONU1 determining the second time slot according to the first time slot scheduling message is shown in corresponding step 305 in Figure 3, and details will not be described again. ONU1 detects whether the third time slot in the first upstream data stream has been occupied by valid upstream services. Wherein, the third time slot is at least part of the second time slot. For example, as shown in Figures 8a and 8b, Figure 8a is a second structural example diagram of an uplink data flow provided by an embodiment of the present application. Figure 8b is a diagram showing a third structural example of an uplink data flow provided by an embodiment of the present application. When ONU1 determines that the start time of the second time slot is time t1 and the end time of the second time slot is time t3 according to the first time slot scheduling message, ONU1 detects whether the second time slot has been occupied by valid uplink services. Among them, the effective uplink service is the uplink service from any ONU in the ring network. In the example shown in Figure 8a, the first uplink data stream 800 is an example in which all second time slots are occupied by valid uplink services. It can be understood that in the example shown in Figure 8a, the second time slot and the third time slot are the same, that is, the starting time is time t1 and the end time is time t3. In the example shown in Figure 8b, the first uplink data stream 810 is an example in which part of the second time slot is occupied by valid uplink services. Specifically, in the second time slot, valid uplink services have been carried from time t1 to time t2. From time t2 to time t3, the filling information has been carried. It can be understood that in the example shown in Figure 8b, the starting time of the second time slot is time t1 and the ending time is time t3, while the starting time of the third time slot is time t1 and the ending time is time t2.

Wherein, in the case where the ring network in this embodiment includes ONU1 and ONU2, the effective uplink service is the uplink service from ONU2. If the ring network also includes ONU3 connected between ONU2 and OLT2, the effective uplink service can also be the uplink service from ONU3, and the details will not be described again.

Step 706: ONU1 obtains the second upstream data stream.

In this embodiment, ONU1 can send the second upstream data stream in different ways according to different situations where ONU1 detects whether the second time slot has been occupied by valid upstream services. The following describes several ways in which ONU1 sends the second upstream data stream. Optional methods:

Optional method 1

Through step 705, when ONU1 determines according to the first time slot scheduling message that the second time slot in the first upstream data stream is not occupied by valid uplink services, ONU1 carries ONU1's traffic on the second time slot of the first upstream data stream. The uplink service obtains the second uplink data stream. For specific instructions, please refer to step 305 corresponding to Figure 3, which will not be described in detail.

Optional method 2

If step 705 is passed, ONU1 determines that the second time slot has been fully occupied by valid uplink services. For example, as shown in Figure 8a, if the second time slot (the starting time is time t1 and the end time is time t3) has been completely occupied by valid uplink services, in this example the third time slot is the same as the second time slot, so The ONU1 replaces the valid uplink service occupying the second time slot with the uplink service of ONU1, and obtains the second uplink data stream 802.

ONU1 also carries the first indication message on the second time slot of the first upstream data stream 800 . The first indication message is used to indicate that ONU1 has replaced the valid uplink service carried on the second time slot with the uplink service of ONU1. For example, the start time of the second time slot shown in Figure 8a is time t1, and the end time is t3. ONU1 carries the first indication message on the second time slot included in the first upstream data stream 800, and obtains the second upstream data stream 802. The first indication message may include the start time t1 of the second time slot, the end time t3 and the identification of the ONU1 occupying the second time slot. OLT1 can detect whether an error occurs in the ONU indicated by OLT1 for the second time slot according to the first indication message. For example, OLT1 allocates the same second time slot to ONU1 and ONU2.

Optional method 3

If step 705 is passed, ONU1 determines that the second time slot has been fully occupied by valid uplink services. For example, as shown in Figure 8a, if the second time slot (the starting time is time t1 and the end time is time t3) has been completely occupied by valid uplink services, in this example the third time slot is the same as the second time slot, so The ONU1 may temporarily not send the uplink services of ONU1 to OLT1. It can be understood that ONU1 shown in this optional method suspends the transmission of upstream services this time, thereby avoiding conflicts between the upstream services of ONU1 and the upstream services of other ONUs. ONU1 carries a third indication message on the second time slot, and the third indication message is used to indicate that the second time slot has been fully occupied by valid uplink services. For example, the start time of the second time slot shown in Figure 8a is time t1, and the end time is t3. ONU1 carries the third indication message on the second time slot of the first upstream data stream 800 to obtain the second upstream data stream 801. For example, the third indication message may include the starting time t1, the ending time t3 of the second time slot, and the ONU identification of the valid uplink service occupying the second time slot. OLT1 can detect whether an error occurs in the ONU indicated by OLT1 for the second time slot according to the third indication message. For example, OLT1 allocates the same second time slot to ONU1 and ONU2.

Optional method 4

In optional methods 2 to 3, it is assumed that the second time slot is completely occupied by valid uplink services. In this example, the second time slot is partially occupied by valid uplink services. Specifically, the second time slot includes a third time slot and a fourth time slot, where the third time slot is occupied by valid uplink services, and the fourth time slot already carries filling information. The ONU1 replaces the effective uplink service occupying the third time slot with the uplink service of ONU1, and carries the uplink service of ONU1 on the fourth time slot. For example, as shown in Figure 8b, if the third time slot (the starting time is time t1, the ending time is time t2) in the second time slot (the starting time is time t1, the ending time is time t3) has been effectively uplinked, occupied. The fourth time slot (the starting time is time t2 and the end time is time t3) already carries filling information. ONU1 replaces the valid uplink service carried on the third time slot of the first upstream data stream 810 with the uplink service of ONU1, and ONU1 also replaces the filling information carried on the fourth time slot of the first upstream data stream 810 For the upstream service of ONU1, the second upstream data stream 811 is obtained. ONU1 may also carry a first indication message in the second time slot, where the first indication message is used to indicate that ONU1 has replaced the valid uplink service carried on the third time slot with the uplink service of ONU1.

Optional method 5

In this example, the second time slot is partially occupied by valid uplink traffic. Specifically, the second time slot includes a third time slot and a fourth time slot, where the third time slot is occupied by valid uplink services, and the fourth time slot already carries filling information. The ONU1 suspends the transmission of uplink services this time, thereby avoiding conflicts between the uplink services of ONU1 and the uplink services of other ONUs. ONU1 carries a third indication message on the second time slot. This third indication message is used to indicate that the second time slot has been fully occupied by valid uplink services. For instructions on how ONU1 suspends sending ONU1's uplink services, please refer to optional method 3. shown and will not be described in details.

Optional method 6

ONU1 determines the third time slot and the fourth time slot according to the first time slot scheduling message. For descriptions of the third time slot and the fourth time slot, please refer to optional mode 4, and the details will not be described again. ONU1 shown in this example carries the uplink service of ONU1 on the fourth time slot. For example, in the example shown in Figure 8b, in the second time slot, the effective uplink service occupies the third time slot (the starting time is time t1 and the end time is time t2), while the fourth time slot (the starting time is time t2 t2, the end time is time t3) has carried filling information. ONU1 replaces the filling information on the fourth time slot of the first upstream data stream 810 with the upstream service of ONU1, and obtains the second upstream data stream 812. The ONU1 shown in this embodiment can carry the second indication message on the fourth time slot, and the second indication message is used to indicate that the ONU1 has carried the uplink service of the ONU1 on the fourth time slot.

Step 707: ONU1 sends the second upstream data stream to OLT1.

Step 708: OLT1 receives the second upstream data stream.

For an explanation of the execution process of steps 707 to 708 shown in this embodiment, please refer to the corresponding steps 305 to 306 shown in Figure 3, and the specific execution process will not be described again.

When OLT1 receives the second upstream data stream, OLT1 obtains the upstream services of each ONU from the second upstream data stream. If the second upstream data stream has carried the first indication message, OLT1 detects whether an error occurs in the ONU indicated by OLT1 for the second time slot according to the first indication message. For example, OLT1 allocates the same second time slot to ONU1 and ONU2. If OLT1 determines that the ONU indicated by the second time slot has an error, OLT1 reconfigures the first time slot scheduling message to ensure that in the first time slot scheduling message, different time slots correspond to different ONU identities. OLT1 then sends the configured first time slot scheduling message to ONU1. For the specific sending process, please refer to step 701, which will not be described in detail.

In this embodiment, ONU1 and OLT1 are directly connected as an example. If in other examples, one or more ONUs are connected between ONU1 and OLT1, then each ONU connected between OLT1 and ONU1 will execute the above execution by ONU1. The steps and specific execution process will not be described in detail.

Using the method shown in this embodiment, ONU1 can detect whether the time slot indicated by OLT1 by ONU1 in the second upstream data stream is occupied by an error. When ONU1 determines that the time slot indicated by OLT1 is occupied by the valid uplink services of other ONUs, ONU1 can send an indication message to OLT1 to indicate the occurrence of a time slot occupation error, so that OLT1 can promptly detect whether the time slot indicated by ONU1 occurs. Allocation error. If an allocation error occurs, OLT1 can promptly adjust to the time slot indicated by ONU1, ensuring that ONU1 can subsequently send ONU1's uplink services to OLT1 in a timely manner.

Figure 7b is a third step flow chart of the data transmission method provided by the embodiment of the present application. The data transmission method shown in this embodiment can detect whether each ONU in the ring network transmits uplink services according to the time slot indicated by OLT1.

Step 711: OLT1 sends the first time slot scheduling message to ONU1.

Step 712: ONU1 copies the first time slot scheduling message and obtains the second time slot scheduling message.

Step 713: ONU1 sends the second time slot scheduling message to ONU2.

Step 714: ONU2 sends the first upstream data stream to ONU1.

For description of the execution process of steps 711 to 714 shown in this embodiment, please refer to the description of the execution process of step 701 to step 704 shown in Figure 7a, and the specific execution process will not be described again.

Step 715: ONU1 obtains the second upstream data stream.

For an explanation of the execution process of step 715 shown in this embodiment, please refer to step 305 in Figure 3 , and details will not be described again.

Step 716: ONU1 sends the second upstream data stream after time slot conflict detection to OLT1.

The ONU1 shown in this embodiment can detect whether the second upstream data stream passes the time slot conflict detection. The time slot conflict detection means that the ONU1 detects whether the time slot actually used by each ONU in the ring network to carry the uplink service matches the time slot. The timeslot indicated by OLT1 is the same for each ONU. The following describes the process of time slot conflict detection by ONU1 on the second upstream data stream:

First, ONU1 obtains the first time slot correspondence according to the second upstream data stream. The first time slot correspondence includes the correspondence between each time slot and the downstream ONU identification carried by the time slot. It can be understood that ONU1 determines the identity of the downstream ONU that actually occupies each time slot according to the second upstream data stream.

The first time slot correspondence relationship can be shown in combination with Figure 8c and Table 1, where Figure 8c is a fourth structural example diagram of an uplink data stream provided by an embodiment of the present application.

Table 1

This example shows that ONU1, ONU2 and ONU3 are connected in sequence between OLT1 and OLT2. ONU1 shown in this example obtains the second upstream data stream 820 as shown in Figure 8c. The second upstream data stream 820 includes the second time slot and the identity of ONU1 carried by the second time slot. The starting time of the first time slot is time t1 and the end time is time t2. The second upstream data stream 820 includes the first time slot and the identity of ONU2 carried by the first time slot. The starting time of the first time slot is time t3, and the end time is time t4. The second upstream data stream 820 also includes a third time slot and an identification of ONU3 carried by the third time slot. The starting time of the third time slot is time t5, the end time is time t6, and so on. If ONUN is also connected between ONU1 and OLT2, the second upstream data stream 820 also includes the Nth time slot and the Nth time slot. The identifier of the ONUN carried by the timeslot.

Again, ONU1 obtains the second time slot correspondence according to the first time slot scheduling message. The second time slot correspondence includes the identification of each ONU in the ring network and the correspondence between the time slots indicated by OLT1 for each ONU. It can be understood that ONU1 determines the time slot indicated by OLT1 for each ONU according to the first time slot scheduling message. The corresponding relationship of the second time slot can be seen in Table 2:

Table 2

It can be understood that ONU1 creates the second time slot corresponding relationship as shown in Table 2 based on the N Allocation Structures included in the first time slot scheduling message. For example, ONU1 obtains the Alloc-ID1 corresponding to ONU1 and the corresponding second time slot based on Allocation Structure1. ONU1 obtains the Alloc-ID2 corresponding to ONU2 and the corresponding first time slot according to Allocation Structure2. Similarly, ONU1 obtains the Alloc-ID3 corresponding to ONU3 and the corresponding third time slot based on Allocation Structure3. By analogy, if ONUN is also connected between ONU1 and OLT2, ONU1 obtains the Alloc-IDN corresponding to ONUN and the corresponding Nth time slot based on Allocation StructureN.

ONU1 determines whether the time slot for each ONU in the ring network to send uplink services is accurate based on the first time slot correspondence shown in Table 1 and the second time slot correspondence shown in Table 2. That is, ONU1 determines whether the time slot used by each ONU in the ring network to send uplink services is accurate. The slot correspondence and the second time slot correspondence determine whether the time slot actually occupied by each ONU for sending uplink services is the same as the time slot indicated by OLT1. Specifically, if ONU1 determines that the corresponding relationship between the first time slot and the second time slot is the same, ONU1 determines that the time slot occupied by the uplink service sent by ONU1 is accurate. That is, the time slot actually occupied by ONU1 in the first upstream data stream (that is, the time slot carrying the upstream service of ONU1) is the same as the time slot indicated by OLT1 for ONU1 through the first time slot scheduling message. Similarly, ONU1 determines that the time slot occupied by the uplink service sent by ONU2 is accurate. That is, ONU2 is in the The time slot actually occupied in an uplink data stream (that is, the time slot carrying the uplink service of ONU2) is the same as the time slot indicated by OLT1 to ONU2 through the first time slot scheduling message. When the corresponding relationship between the first time slot and the second time slot is the same, it also means that the time slot actually occupied by ONU3 in the uplink data stream (that is, the time slot carrying the uplink service of ONU3) is the same as the time slot that OLT1 passes through the first time slot. The time slot indicated by the scheduling message for ONU3 is the same. By analogy, when the corresponding relationship between the first time slot and the second time slot is the same, it also means that the time slot actually occupied by ONUN in the upstream data stream (that is, the time slot carrying ONUN's upstream service) is the same as the time slot that OLT1 passes through the third time slot. A time slot scheduling message indicates the same time slot as ONUN.

If ONU1 determines that the corresponding relationship between the first time slot and the second time slot is the same, ONU1 determines that the second upstream data stream has passed the time slot conflict detection. Then ONU1 sends the second upstream data stream that passes the time slot conflict detection to OLT1.

If ONU1 determines that the first time slot correspondence is different from the second time slot correspondence, ONU1 sends the first time slot correspondence to OLT1, and OLT1 detects that OLT1 is included in the ring network based on the first time slot correspondence. Whether there is an error in the time slot indicated by each ONU, ONU1 sends the first time slot correspondence to OLT1 for description, please refer to the description of ONU1 sending the first indication message to OLT1, and the details will not be repeated.

In this embodiment, ONU1 detects whether the second upstream data stream passes the time slot conflict detection as an example. In other examples, ONU1 can also detect whether the first upstream data stream passes the time slot conflict detection when receiving the first upstream data stream from ONU2. For the process of detecting whether the first upstream data stream passes the time slot conflict detection through time slot conflict detection, please refer to the description of the process of detecting whether the second upstream data stream passes the time slot conflict detection, which will not be described in detail.

Step 717: OLT1 receives the second upstream data stream.

For the description of OLT1 receiving the second upstream data stream shown in this embodiment, please refer to the description of OLT1 receiving the second upstream data stream shown in step 305 corresponding to Figure 3, and details will not be described again.

Using the method shown in this embodiment, ONU1 can detect whether the time slots occupied by the upstream services of each ONU included in the ring network in the second upstream data stream are accurate, and ONU1 determines whether the upstream services of any ONU are in the second upstream data stream. When there is an occupancy error in the upstream data stream, ONU1 can notify OLT1 of the time slot occupancy error event to ensure that when each ONU in the ring network transmits the upstream data stream, each ONU can follow the time slot indicated by OLT1 Sending uplink services effectively ensures the transmission quality of the ring network and the transmission bandwidth of each ONU for transmitting uplink services, and improves the controllability and transmission efficiency of transmitting uplink services.

The following describes the process of OLT1 sending downlink data streams to each ONU included in the ring network with reference to the example shown in Figure 9. Figure 9 is a flow chart of the fourth step of the data transmission method provided by the embodiment of the present application. .

Step 901: OLT1 sends the first downstream data stream to ONU1.

This embodiment takes OLT1 sending downlink services to ONU1 and ONU2 as an example. In other examples, OLT1 can send downlink services to a larger number of ONUs. For the specific sending process, please refer to OLT1 sending downlink services to ONU1 and ONU2 shown in this embodiment. Description of business. In other examples, OLT2 can also send downlink services to each ONU. Specifically, the For the process, please refer to the description of OLT1 sending downlink services to each ONU shown in this embodiment.

The structure of the first downlink data flow shown in this embodiment can be seen in Figure 10 , where Figure 10 is an example diagram of the structure of the downlink data flow provided by this embodiment of the present application. The first downlink data stream 1000 shown in this embodiment includes M downlink data frames. That is, the first downlink data stream 1000 includes the first downlink data frame, the second downlink data frame to the M-th downlink data frame, where M is any positive integer greater than 1. For a description of the structure of each downlink data frame, please refer to Figure 5, which will not be described in detail. The payload of each downlink data frame carries downlink services. Taking the payload of the Mth downlink data frame as an example, the payload of the Mth downlink data frame has carried at least one of the downlink service sent to ONU1 or the downlink service sent to ONU2.

As shown in FIG. 10 and FIG. 11 , FIG. 11 is a transmission example diagram of a downlink data flow provided by an embodiment of the present application. OLT1 obtains the first downlink service to be sent to ONU1 and the second downlink service to be sent to ONU2. OLT1 encapsulates the first downlink service and the second downlink service to obtain the first downlink data stream 1000. In other examples, the first downstream data stream may also carry broadcast services sent to all connected ONUs, which are not limited in this embodiment. When OLT1 obtains the first downstream data stream shown in this embodiment, OLT1 performs electro-optical conversion on the first downstream data stream to obtain the first downstream data stream in the form of an optical signal. OLT1 is connected to OLT1 based on The optical fiber between ONU1 and ONU1 sends the first downstream data stream in the form of optical signals to ONU1.

Optionally, when OLT1 in this embodiment obtains the first downstream data stream, OLT1 can perform FEC encoding on the first downstream data stream to send the FEC-encoded first downstream data stream to ONU1. data flow. For detailed description of FEC encoding, please refer to the description of the embodiment corresponding to Figure 3, and no further details will be given.

Step 902: ONU1 copies the first downstream data stream and obtains the second downstream data stream.

Continuing to combine Figures 10 and 11, ONU1 receives the first downstream data stream 1001 through the optical fiber connected between ONU1 and OLT1. ONU1 performs photoelectric conversion on the first downstream data stream 1001 to obtain an electrical signal. The first downstream data flow. As shown in Figure 10, ONU1 obtains the first downstream data stream 1001 after photoelectric conversion. ONU1 copies the first downstream data stream 1001 and obtains the second downstream data stream 1002. It can be understood that the first downstream data stream 1001 It is exactly the same as the content carried by the second downstream data stream 1002.

Optionally, if OLT1 has performed FEC encoding on the first downstream data stream, ONU1 can perform FEC decoding on the first downstream data stream before ONU1 copies the first downstream data stream, and ONU1 can decode the FEC on the first downstream data stream. The subsequent first downstream data stream is copied to obtain the second downstream data stream. For instructions on FEC decoding, please refer to the corresponding embodiment in Figure 3, which will not be described in detail.

Step 903: ONU1 obtains the first downlink service carried by the first downlink data stream.

Continuing to refer to Figure 11, ONU1 processes the first downstream data stream 1001 and obtains the first downstream service carried by the first downstream data stream 1001. Specifically, ONU1 obtains the downlink data frame carrying the ONU1 identification from the first downstream data stream based on the ONU1 identification, and ONU1 obtains the first downlink service from the payload of the downlink data frame carrying the ONU1 identification.

Step 904: ONU1 sends the second downstream data stream to ONU2.

This embodiment does not limit the execution timing between step 903 and step 904. Optional, as shown in this embodiment The ONU1 of ONU1 can perform FEC encoding on the second downstream data stream before performing electro-optical conversion on the second downstream data stream. ONU1 then performs electro-optical conversion on the FEC-encoded second downstream data stream so as to pass through the connection between ONU1 and ONU2. The optical fiber between ONU2 sends the second downstream data stream in the form of optical signal to ONU2.

Step 905: ONU2 obtains the second downlink service carried by the second downlink data stream.

ONU2 processes the second downlink data flow and obtains the second downlink service carried by the second downlink data flow. Specifically, ONU2 obtains the downlink data frame carrying the ONU2 identification from the second downstream data stream based on the ONU2 identification, and ONU2 obtains the second downlink service from the payload of the downlink data frame carrying the ONU2 identification. For a description of the specific process of ONU2 obtaining the second downlink service, please refer to the process of ONU1 obtaining the first downlink service shown in step 903, which will not be described again.

Using the method shown in this embodiment, taking ONU1 as an example, when ONU1 receives the first downstream data stream, it first copies the first downstream data stream to obtain the second downstream data stream, because ONU1 does not need to execute the first downstream data stream. The related operations of obtaining the service for the second downstream data stream effectively reduce the delay of ONU1 sending the second downstream data stream to ONU2 and ensure the timeliness of each ONU included in the ring network obtaining the downstream service.

The beneficial effects of the embodiment shown in Fig. 9 will be described with reference to Fig. 12. Among them, Figure 12 is an example diagram of the second structure of a ring network provided by an existing solution. Figure 12 shows a ring network including ONU1, ONU2, ONU3 to ONUN. Taking optical splitter 1201 as an example, ONU1 is connected to the first port of optical splitter 1201, the second port of optical splitter 1201 is connected to optical splitter 1202, and the third port of optical splitter 1201 is connected to OLT1. For the description of the connection of the optical splitter 1202, the optical splitter 1203 and the optical splitter 1204, please refer to the description of the optical splitter 1201, and the details will not be repeated. If OLT1 is required to send downlink services to each ONU, OLT1 sends the first downlink data stream to the optical splitter 1201. The optical splitter 1201 splits the first downlink data stream to obtain the first split data stream and the second split data stream. The services carried by the first split data stream and the second split data stream are consistent. The optical data of the first split data stream is the same. The power is less than the optical power of the second split optical data stream. The optical splitter 1201 sends the first split data stream to ONU1. The optical splitter 1201 sends the second optical split data stream to the optical splitter 1202. The optical splitter 1202 also splits the second optical data stream again. For the description of the optical splitting by the optical splitter 1202, please refer to the description of the optical splitting by the optical splitter 1201, and the details will not be described again. It can be seen that in the existing ring network, in order to send downlink services to each ONU (such as ONU1), OLT1 needs to split the light through an optical splitter, resulting in a loss of optical power. For example, the optical power of the downlink data stream received by ONU2, Part of the light has been split to ONU1. The loss of optical power makes it difficult and accurate for each ONU to obtain downlink services. Moreover, each optical splitter shown in Figure 12 is an unequal ratio optical splitter. If a larger number of optical splitters are connected to a ring network, the insertion loss of the ring network will be increased.

However, any two adjacent nodes included in the ring network shown in this embodiment are directly connected through optical fibers. For example, OLT1 and ONU1 are directly connected through optical fibers, and ONU1 and ONU2 are directly connected through optical fibers. There is no need to use unequal ratios. The optical device is connected to reduce the insertion loss of the ring network. For the downstream data stream sent by OLT1, each ONU performs photoelectric conversion on the downstream data stream and processes the downstream data stream in the form of electrical signals (as shown in the above copy), which reduces the efficiency of the downstream data stream received by each ONU. loss of optical power.

The structure of the ONU1 shown in this embodiment will be described below with reference to FIG. 13 , where FIG. 13 is a first structural example diagram of the ONU1 provided by the embodiment of the present application.

ONU1 shown in this embodiment includes an optical module 1301 and an optical module 1302. Among them, the optical module 1301 includes the A transmitting port (transport, TX) and a first receiving port (receive, RX). The optical module 1302 includes a second TX and a second RX. 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. Taking the optical module 1301 as an example, the optical module 1301 can be a single-fiber bidirectional (BiDi) optical module or a dual-fiber optical module, and is not specifically limited.

The ONU1 shown in this embodiment also includes a switching device. The switching device includes a detector 1310 and a switch array 1330 connected to the detector 1310 . The switch array 1330 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. Then, as shown in this embodiment The switch array 1330 includes four input ports, namely a first input port 1311, a second input port 1322, a third input port 1313 and a fourth input port 1324. The switch array 1330 includes four output ports, namely a first output port 1321, a second output port 1312, a third output port 1323 and a fourth output port 1314.

It should be noted that the number of input ports and output ports included in the switch array 1330 shown in this embodiment is not limited. The detector 1310 shown in this embodiment is used to connect any input port included in the switch array 1330 to the first output port included in the switch array 1330 .

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 1310 causes the switch array 1303 to The first input port 1311 is connected to the first output port 1321, and the first output port 1321 is connected to the first processing port 1341 of the service processor 1340. The detector 1310 also connects the fourth output port 1314 of the switch array and the fourth input port 1324 , and the fourth input port 1324 is connected to the second processing port 1342 of the service processor 1340 . The first input port 1311 and the fourth output port 1314 are both connected to the optical module 1301. Similarly, the detector 1310 connects the second output port 1312 of the switch array 1303 to the second input port 1322, and the second input port 1322 is connected to the third processing port 1343 of the service processor 1340. The detector 1310 connects the third input port 1313 of the switch array 1330 to the third output port 1323, and the third output port 1323 is connected to the fourth processing port 1344 of the service processor 1340.

The detector 1310 shown in this embodiment may be one or more chips, or one or more integrated circuits. For example, the detector 1310 may be one or more field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), system on chips (SoCs), central processing units Central processor unit (CPU), network processor (NP), digital signal processing circuit (digital signal processor, DSP), microcontroller unit (MCU), programmable logic device , PLD) or other integrated chips, or any combination of the above chips or processors, etc. For the description of the service processor 1340, please refer to the description of the form of the detector 1310, and details will not be described again. The detector 1310 and the service processor 1340 shown in this embodiment may be implemented in separate structures or in the same structure, which are not limited in this embodiment.

Based on the structure of ONU1 shown in Figure 13, the process of ONU sending uplink services to OLT1 is explained in conjunction with Figure 14. The process will be described, where FIG. 14 is a fifth step flow chart of the data transmission method provided by the embodiment of the present application.

Step 1401: 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 determines OLT1 as the main OLT, 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. In other examples, ONU1 can also select OLT2 as the main OLT. For instructions on ONU1 selecting OLT2 as the main OLT, please refer to the selection of ONU1 shown in this embodiment. The description of OLT1 as the main OLT will not be described in detail. 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 1340 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 1340 Processor 1340 determines OLT1 as the primary OLT.

Optional method 2

The service processor 1340 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 1340 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 1402: ONU1 receives the first downlink data stream through the first RX.

In this embodiment, when the service processor determines that OLT1 is the main OLT, the service processor 1340 controls each input port and each output port included in the switch array 1330 to be in the first conduction mode through the detector 1310 . The first conduction mode refers to that the first input port 1311 of the switch array 1303 is connected to the first output port 1321. The fourth output port 1314 and the fourth input port 1324 of the switch array are connected. The second output port 1312 of the switch array 1303 is connected to the second input port 1322. The third input port 1313 of the switch array 1330 is connected to the third output port 1323.

The first RX of ONU1 receives the first downstream data stream from OLT1. The optical module 1301 performs photoelectric conversion on the first downstream data stream to obtain a first downstream data stream in the form of an electrical signal. The first downstream data flow is sequentially transmitted to the first processing port 1341 of the service processor 1340 via the first input port 1311 and the first output port 1321. Industry The service processor 1340 is configured to obtain the downlink service from OLT1 for the first downlink data flow from the first processing port 1341.

Specifically, the service processor 1340 obtains the first downlink service sent to ONU1 from the downlink time slot of the first downlink data stream. ONU1 obtains a downlink data frame used to carry the first downlink service sent to ONU1 from the plurality of downlink data frames included in the first downlink data stream. Wherein, the destination address of the downlink data frame used to carry the first downlink service is the address or identification of ONU1. ONU1 obtains the first downlink service from the downlink data frame. For the specific description of the downlink data frame, please refer to Figure 9, and the details will not be repeated.

Step 1403: ONU1 sends the second downlink data stream through the second TX.

Optionally, in the case where ONU2 also uses OLT1 as the main OLT, ONU1 obtains the second downstream data stream to be sent to ONU2 according to the first downstream data stream. The following describes several optional ways for ONU1 to obtain the second downstream data stream:

Optional method 1

When ONU1 extracts the first downstream service sent to ONU1 from the downstream time slot of the first downstream data stream, ONU1 carries filling information in the downstream time slot to obtain the second downstream data stream.

Optional method 2

ONU1 extracts the second downstream service from the first downstream data stream. The second downlink service is the downlink service already carried by the first downlink data flow. ONU1 determines that the second downlink service also needs to be sent to ONU2. For example, if ONU1 determines that the second downlink service is a service broadcast by OLT1. For another example, the identifier included in the second downlink service is the identifier of ONU2, etc. ONU1 re-carries the second downlink service on the first downlink data flow to obtain the second downlink data flow.

Optional method 3

After ONU1 receives the first downstream data stream, ONU1 copies the first downstream data stream to obtain the second downstream data stream. ONU1 extracts the first downlink service sent to ONU1 from the first downlink data stream. ONU1 directly sends the second downstream data stream to ONU2, which reduces the delay for ONU1 to send the second downstream data stream to ONU2.

Referring to FIG. 13 , the third processing port 1343 of the service processor 1340 outputs the second downstream data stream, and the second downstream data stream is sequentially transmitted to the optical module 1302 via the second input port 1343 and the second output port 1312 . The optical module 1302 performs electro-optical conversion on the second downstream data stream to obtain a second downstream data stream in the form of an optical signal. The optical module 1302 sends the second downlink data stream to ONU2 through the second TX.

Step 1404: ONU1 receives the first upstream data stream through the second RX.

Optionally, when ONU2 also uses OLT1 as the main OLT, ONU2 obtains that the second downstream data stream carries the time slot scheduling message from OLT1. This time slot scheduling message is used to indicate the first time slot allocated by OLT1 to ONU2. ONU2 carries the uplink services that ONU2 needs to send to OLT1 in the first uplink time slot of the first uplink data stream. For the description of the time slot scheduling message, please refer to the description of the corresponding embodiment in Figure 3, and details will not be described again.

Step 1405: ONU1 sends the second upstream data stream through the first TX.

ONU1 obtains that the first downstream data stream has carried the time slot scheduling message from OLT1. This time slot scheduling message is used to Indicates the second time slot allocated by OLT1 to ONU1. On the first upstream time slot of the first upstream data stream, ONU1 carries the upstream services that ONU1 needs to send to OLT1 to obtain the second upstream data stream. For a description of the specific process, please refer to the description of the embodiment corresponding to Figure 3, and details will not be described again.

As shown in FIG. 13 , the first upstream data stream received by the second RX is sent to the optical module 1302 . The optical module 1302 performs photoelectric conversion on the first upstream data stream to obtain a first upstream data stream in the form of an electrical signal. The first upstream data stream is transmitted to the fourth processing port 1344 via the third input port 1313 and the third output port 1323 in sequence. The service processor 1340 processes the first upstream data stream from the fourth processing port 1344 to obtain the second upstream data stream. The service processor 1340 transmits to the optical module 1301 via the second processing port 1342, the fourth input port 1324, and the fourth output port 1314 in sequence. The optical module 1301 performs electro-optical conversion on the first upstream data stream to obtain a first upstream data stream in the form of an optical signal. ONU1 sends the first upstream data stream to OLT1 through the first TX.

The process of uplink and downlink service transmission by ONU1 will be described with reference to Figure 15 , where Figure 15 is a sixth step flow chart of the data transmission method provided by the embodiment of the present application. In this embodiment, OLT1 can normally send downlink data streams, but a fault event occurs between OLT2 and ONU1, resulting in the inability to perform normal uplink and downlink service transmission between OLT2 and ONU1.

Step 1501: ONU1 detects a fault event between the second RX and OLT2.

For example, as shown in Figure 16, Figure 16 is a second structural example diagram of ONU1 provided by the embodiment of the present application. The detector 1310 of ONU1 can be connected to the optical module 1302, and the detector 1310 detects whether the second RX of the optical module 1302 can receive the optical signal normally. If the detector 1310 continues to be unable to detect the event that the second RX successfully receives the optical signal beyond the preset time period or the optical power of the continuously detected optical signal is less than the preset threshold, then determine whether the second RX of OLT2 and ONU1 A fault event occurred during the period. For another example, the detector 1310 is connected to the line between the optical module 1302 and the third input port 1313 . The detector 1310 obtains the electrical signal output by the optical module 1302 based on the line. The detector 1310 detects whether the electrical signal includes a continuous valid frame header. If not, it is determined that a fault event occurs between the OLT2 and the second RX of the ONU1. For another example, the detector 1310 detects that the bit error rate of the electrical signal exceeds a preset threshold. This embodiment does not limit how the detector 1310 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 transmitted to ONU1. It can be understood that when ONU1 determines that a fault event occurs between the second RX and OLT2, ONU1 determines that OLT1 is the primary OLT.

Step 1502: The detector of ONU1 switches the switch array from the second conduction mode to the first conduction mode.

For an explanation of the switch array 1330 being in the first conduction mode, please refer to FIG. 13 , and details will not be described again. When the switch array 1330 is in the second conduction mode, the first input port 1311 of the switch array 1330 is connected to the third output port 1323, and the third output port 1323 is connected to the fourth processing port 1344. The fourth output port 1314 of the switch array 1330 is connected to the second input port 1322, and the second input port 1322 is connected to the third processing port 1343. The second output port 1312 of the switch array 1330 is connected to the fourth input port 1324, and the fourth input port 1324 is connected to the second processing port 1342. The second input port 1313 of the switch array 1330 is connected to the first output port 1321, and the first output port 1321 is connected to the first processing port 1341. When the switch array 1330 is in the second conduction mode, the downlink data flow from the OLT2 can be transmitted to the service processor 1340 via the second RX, the third input port 1313 and the first output port 1321 of the optical module 1302, so as to make the business process The processor 1340 processes the downlink traffic from OLT2.

When the detector 1310 detects a fault event between OLT2 and the second RX, the detector 1310 switches the conduction mode of the switch array from that shown in Figure 16 to that shown in Figure 13, so that OLT1 is the main OLT and OLT2 is from OLT. After switching, ONU1 can receive the first downstream data stream from OLT1.

This example uses passive switching based on a fault event between OLT2 and ONU1. In other examples, OLT1 and OLT2 can also negotiate active switching, so that OLT1 switches to the master OLT and OLT2 switches to the slave OLT.

Step 1503: ONU1 selects the first RX and the first TX.

When the switch array 1330 is in the first conduction mode, ONU1 determines the first RX as the receiving port that receives the downstream data stream of the main OLT (that is, OLT1).

Step 1504: ONU1 receives the first downlink data stream through the first RX.

For an explanation of the execution process of step 1504 shown in this embodiment, please refer to the corresponding step 1402 shown in Figure 14, and details will not be described again.

Step 1505: ONU1 sends the second downlink data stream through the second TX.

In this embodiment, when ONU1 detects a fault event between OLT2 and ONU1, ONU1 can send the second downstream data stream to ONU2 to ensure that ONU2 can Successfully transmitted uplink and downlink services with OLT1. For the execution process of step 1505 shown in this embodiment, please refer to the corresponding step 1403 in Figure 14, and details will not be described again.

Step 1506: ONU1 receives the first upstream data stream through the second RX.

Step 1507: ONU1 sends the second upstream data stream through the first TX.

For an explanation of the execution process of steps 1506 to 1507 shown in this embodiment, please refer to the corresponding steps 1404 to 1405 shown in Figure 14, and details will not be described again.

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 the ONU1 that has switched the conduction mode can communicate with another OLT ( OLT1) as shown above transmits uplink and downlink services, so that ONU1 can perform data communication with another OLT, ensuring the successful transmission of uplink and downlink services of ONU1.

Using the method shown in this embodiment, when a fault event occurs between the ONU and the main OLT (such as OLT1), the switch array of the ONU can switch the conduction mode, so that the ONU that has switched the conduction mode of the switch array can communicate with The transmission of upstream services between new main OLTs (such as OLT2) ensures the successful transmission of upstream services of each ONU in the ring network.

An embodiment of the present application also provides a communication device. The structure of the communication device is shown in FIG. 17 , where FIG. 17 is an example structural diagram of the communication device provided by an embodiment of the present application. The communication device 1700 shown in this embodiment includes a transceiver 1701 and a service processor 1702, where the transceiver 1701 and the service processor 1702 are connected. The communication device shown in this embodiment may be an OLT. The transceiver 1701 included in the OLT is used to perform the tasks performed by the OLT in the embodiments shown in Figures 3, 7a, 7b, 9, 14 and 15. Processes related to sending and receiving. The service processor 1702 included in the OLT is used to execute the processing-related processes executed by the OLT in the embodiments shown in FIG. 3, FIG. 7a, FIG. 7b, FIG. 9, FIG. 14, and FIG. 15.

The communication device shown in this embodiment can be any ONU included in the ring network. The ONU includes a transceiver 1701 for Execute the processes related to transmission and reception performed by the ONU in the embodiments shown in FIG. 3, FIG. 7a, FIG. 7b, FIG. 9, FIG. 14, and FIG. 15. The service processor 1702 included in the ONU is used to execute the processing-related processes executed by the ONU in the embodiments shown in FIG. 3, FIG. 7a, FIG. 7b, FIG. 9, FIG. 14, and FIG. 15.

Specifically, for the ONU shown in this embodiment, see ONU1 shown in Figure 13 or Figure 16 . More specifically, the transceiver 1701 of the communication device 1700 may include the optical module 1301 and the optical module 1302 shown in Figure 13 or Figure 16. For a specific description of the optical module 1301 and the optical module 1302, please refer to Figure 13 or Figure 16. Explanation without going into details. It should be noted that in this embodiment, the transceiver 1701 includes two optical modules as an example. In other examples, the transceiver 1701 may include only one optical module, or more than two optical modules. When the communication device 1700 includes two or more optical modules, a complex-structured network can be implemented. This embodiment does not limit the specific networking type. For example, as shown in Figure 18, communication equipment including three optical modules can form a dual-ring network. Figure 18 is an example diagram of a dual-ring network structure provided by an embodiment of the present application.

The dual-ring network 1800 includes OLT1 and ONU1 connected to OLT1. The service processor 1802 of ONU1 is connected to the optical module 1801, the optical module 1803 and the optical module 1804 respectively. Optical module 1801 is connected to OLT1, optical module 1803 is connected to ONU2, and optical module 1801 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 13 or Figure 16 , no details will be given. The dual ring network 1800 also includes an ONU4 connected to the OLT2. The ONU4 includes a service processor 1814. The service processor 1814 is connected to the optical module 1811, the optical module 1812 and the optical module 1813 respectively. The optical module 1811 is connected to ONU2. The optical module 1812 is connected to ONU3. The optical module 1813 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 13 or Figure 16, 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 the 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 13 or Figure 16. For specific description, please refer to the corresponding description of Figure 13 or Figure 16, 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 data transmission method, characterized in that the method includes:

The first communication node receives the first uplink data stream from the second communication node. The uplink service of the second communication node occupies the first time slot of the first uplink data stream. The first time slot is used by the central office equipment. instruct;

The first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink data stream, and the second time slot is used by the central office equipment Indicate that the first time slot is different from the second time slot;

The first communication node sends the second upstream data stream to the central office device.
The method according to claim 1, characterized in that the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink data stream. Previously, the method also included:

The first communication node receives a first time slot scheduling message from the central office device, where the first time slot scheduling message is used to indicate the first time slot and the second time slot;

The first communication node copies the first time slot scheduling message to obtain a second time slot scheduling message;

The first communication node sends the second time slot scheduling message to the second communication node.
The method according to claim 1 or 2, characterized in that the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink service. Data flows include:

The first communication node replaces the filling information carried on the second time slot with the uplink service of the first communication node to obtain a second uplink data stream.
The method according to claim 1 or 2, characterized in that the first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink service. Before data flow, the method also includes:

The first communication node determines that the third time slot of the first uplink data stream has carried valid uplink service, the valid uplink service is the uplink service from another communication node, and the third time slot is the at least some of the second time slots;

The first communication node carries the uplink service of the first communication node on the second time slot of the first uplink data stream, and obtaining the second uplink data stream includes:

The first communication node replaces the effective uplink service with the uplink service of the first communication node to obtain the second uplink data stream.
The method according to claim 4, characterized in that before the first communication node sends the second uplink data stream to the central office device, the method further includes:

The first communication node carries a first indication message on the third time slot, and the first indication message is used to indicate that the first communication node has replaced the effective uplink service with the first communication node. Upward business.
The method according to claim 4 or 5, characterized in that the third time slot is a part of the second time slot, and the first communication node is in the first upstream data stream. Carrying the uplink service of the first communication node on the second time slot, obtaining the second uplink data stream includes:

The first communication node carries the uplink service of the first communication node on the fourth time slot of the first uplink data stream to obtain the second uplink data stream, and the fourth time slot is the first time slot of the first uplink data stream. The second time slot is not occupied by the effective uplink service. time slot.
The method according to claim 6, characterized in that before the first communication node sends the second uplink data stream to the central office device, the method further includes:

The first communication node carries a second indication message on the fourth time slot, and the second indication message is used to indicate that the first communication node has carried the first communication on the fourth time slot. Node’s upstream services.
The method according to any one of claims 1 to 7, wherein the first communication node sending the second uplink data stream to the central office device includes:

The first communication node obtains a first time slot correspondence relationship of the second uplink data stream, and the first time slot correspondence relationship includes the first time slot and the communication node identification carried by the first time slot. corresponding relationship;

The first communication node obtains a second time slot correspondence, and the second time slot correspondence is a correspondence between the first time slot and the second communication node identification indicated by the central office device;

If the first communication node determines that the first time slot corresponding relationship is the same as the second time slot corresponding relationship, the first communication node sends the second uplink data stream to the central office device.
The method according to claim 8, characterized in that after the first communication node obtains the second time slot correspondence, the method further includes:

If the first communication node determines that the first time slot correspondence is different from the second time slot correspondence, the first communication node sends the first time slot correspondence to the central office device.
The method according to any one of claims 1 to 9, 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 first upstream data stream from the second communication node, the method further includes:

The first communication node switches the second RX to a receiving port for receiving the first upstream data stream among the first RX and the second RX.
The method according to claim 10, characterized in that, among the first RX and the second RX, the first communication node switches the second RX to receive the first uplink data stream. Before receiving the port, the method further includes:

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 10, characterized in that, among the first RX and the second RX, the first communication node switches the second RX to receive the first uplink data stream. Before receiving the port, the method further includes:

The first communication node detects a failure event in the optical signal received via the second RX.
A data transmission method, characterized in that the method includes:

The second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream to obtain the first uplink data stream, and the first time slot is indicated by the central office device;

The second communication node sends the first uplink data stream to the first communication node.
The method according to claim 13, characterized in that the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream, and before obtaining the first uplink data stream, the The above methods also include:

The second communication node receives the initial upstream data stream.
The method according to claim 13, characterized in that the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream, and before obtaining the first uplink data stream, the The above methods also include:

The second communication node generates the initial upstream data stream.
The method according to any one of claims 13 to 15, characterized in that the second communication node carries the uplink service of the second communication node on the first time slot of the initial uplink data stream, and obtains the first uplink service. Before the data flow, the method also includes:

The second communication node receives a second time slot scheduling message from the first communication node, and the second time slot scheduling message is used to indicate the first time slot.
The method according to any one of claims 13 to 16, 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 is connected between the central office equipment and the second communication node.
A data transmission method, characterized in that the method includes:

The first communication node receives the first downlink data flow from the central office equipment, and the first downlink data flow has carried downlink services;

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

The first communication node obtains the downlink service carried by the first downlink data flow;

The first communication node sends the second downlink data stream to the second communication node.
The method according to claim 18, characterized in that after the first communication node receives the first downlink data stream from the central office device, the method further includes:

The first communication node obtains the first time slot scheduling message that has been carried by the first downlink data stream. The first time slot scheduling message is used to indicate the first time slot. The uplink service of the first communication node Occupy the first time slot of the upstream data stream.
The method according to claim 18 or 19, 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 second Communication nodes are connected, and the first communication node receives the first downlink data stream from the central office equipment. Before the first downlink data stream has carried downlink services, the method further includes:

The first communication node switches the first RX to a receiving port for receiving the first downlink data stream among the first RX and the second RX.
The method according to claim 20, wherein the first communication node switches the first RX to receive the first downlink data stream among the first RX and the second RX. Before the receiving port, the method also includes:

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 20, wherein the first communication node switches the first RX to receive the first downlink data stream among the first RX and the second RX. Before the receiving port, the method also includes:

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 18 to 22, 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 is connected between the central office equipment and the second communication node.
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 first uplink data stream from another communication node. The uplink service of the second communication node occupies a first time slot of the first uplink data stream. The first time slot is provided by the central office. Equipment Instructions;

The service processor is configured to carry the uplink service of the communication node on the second time slot of the first uplink data stream, and obtain the second uplink data stream, where the second time slot is indicated by the central office device, the first time slot is different from the second time slot;

The transceiver is further configured to send the second upstream data stream to the central office device.
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 service processor is configured to carry the uplink service of the communication node on the first time slot of the initial uplink data flow, and obtain the first uplink data flow, where the first time slot is indicated by the central office device;

The transceiver is configured to send the first upstream data stream to another communication node.
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 used to receive the first downlink data stream from the central office equipment, and the first downlink data stream has carried downlink services;

The service processor is configured to copy the first downlink data flow and obtain a second downlink data flow;

The service processor is configured to obtain the downlink service carried by the first downlink data flow;

The transceiver is configured to send the second downlink data stream to the other 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 second communication node is configured to carry the uplink service of the second communication node on the first time slot of the initial uplink data stream to obtain the first uplink data stream;

The second communication node is configured to send the first uplink data stream to the first communication node;

The first communication node is configured to carry the uplink service of the first communication node on the second time slot of the first uplink data stream to obtain the second uplink data stream, the first time slot and the third Two time slots are respectively indicated by the central office equipment, and the first time slot is different from the second time slot;

The first communication node is configured to send the second uplink data stream to the central office device.
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 central office equipment is configured to send a first downlink data stream to the first communication node, and the first downlink data stream already carries downlink services;

The first communication node is used to copy the first downlink data stream to obtain a second downlink data stream;

The first communication node is used to obtain the downlink service carried by the first downlink data flow;

The first communication node is configured to send the second downlink data stream to the second communication node.