CN118158571A

CN118158571A - Method for generating topology information and related equipment

Info

Publication number: CN118158571A
Application number: CN202211558414.7A
Authority: CN
Inventors: 蔡尚广; 郑刚; 李博睿
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2024-06-07

Abstract

The embodiment of the application discloses a method for generating topology information and related equipment. The method is applied to an optical communication system, and the optical communication system comprises a main gateway, at least one optical splitter and at least one slave gateway, wherein the main gateway is connected with the at least one optical splitter in a cascading mode, and each slave gateway is connected with a branch port of the corresponding optical splitter. Specifically, the master gateway sends a request message to the slave gateway for requesting the slave gateway to acquire and feed back the statistical information. The optical splitter performs disturbance on optical power of the slave gateway connected with each branch port, so that optical power change of the slave gateway is caused, the statistical information comprises optical power change parameters of the slave gateway, and the optical power change parameters of the slave gateway configured by the optical splitter for different branch ports are different. And the master gateway generates topology information according to the statistical information reported by each slave gateway, so that the connection relation between each slave gateway and the branch port of the corresponding optical splitter is determined, and topology restoration is realized.

Description

Method for generating topology information and related equipment

Technical Field

The present application relates to the field of FTTR, and in particular, to a method for generating topology information and related devices.

Background

With the advent of various intelligent terminals with the popularity of fixed access broadband, fiber-to-room (Fiber to the Room, FTTR) technology has been proposed and has received a great deal of attention in order to solve the problem of WiFi coverage of home networks. FTTR the main idea is to extend the fiber further to the resident room on a fiber-to-the-home (fiber to the home, FTTH) basis. The current networking mode of FTTH is to introduce the optic fibre into the indoor weak current information box of resident, and user's wiFi access device is installed in the information box, because the position of information box is located near the door of registering one's residence generally, and is far away from user's daily activity region, and wiFi signal loss is great and leads to user terminal access bandwidth to be limited. FTTR the main idea is to extend the optical fiber further downwards to the house of the resident, and install the WiFi access equipment in the house, so that the distance between the user terminal equipment and the WiFi equipment is shortened, the quality of WiFi signals is ensured, and the problem of poor user terminal equipment caused by unstable WiFi access is solved.

The FTTR network mainly comprises a master gateway, at least one optical splitter and at least one slave gateway. The main gateway is connected with at least one optical splitter in a cascading mode, and each slave gateway is connected with a branch port of the corresponding optical splitter. In FTTR networks, how to obtain accurate network topology information in real time is a current problem to be solved.

Disclosure of Invention

The embodiment of the application provides a method for generating topology information and related equipment, which can acquire FTTR current topology information of a network in real time through interaction between a master gateway and each slave gateway, thereby being convenient for effectively managing and maintaining the FTTR network.

In a first aspect, an embodiment of the present application provides a method for generating topology information, where the method is applied to an optical communication system, where the optical communication system includes a master gateway, at least one optical splitter, and at least one slave gateway, where the master gateway is connected to the at least one optical splitter in a cascade manner, and each slave gateway is connected to a branch port of a corresponding optical splitter. The method comprises the following steps: the method comprises the steps that a master gateway sends a request message to each slave gateway, wherein the request message is used for requesting each slave gateway to acquire and feed back statistical information, the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports. The master gateway receives at least one response message sent from the gateway, the response message including statistical information. The master gateway generates topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and the branch port of the corresponding optical splitter.

In this embodiment, the master gateway sends a request message to the slave gateway requesting that the slave gateway obtain and feed back the statistics. The optical splitter performs disturbance on optical power of the slave gateway connected with each branch port, so that optical power change of the slave gateway is caused, the statistical information comprises optical power change parameters of the slave gateway, and the optical power change parameters of the slave gateway configured by the optical splitter for different branch ports are different. And the master gateway generates topology information according to the statistical information reported by the slave gateways, so as to determine the connection relation between each slave gateway and the branch port of the corresponding optical splitter. In this way, the current topology information of the FTTR network can be obtained in real time through the interaction between the master gateway and each slave gateway, so that the FTTR network can be managed and maintained effectively.

In some possible embodiments, the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation amplitude, the first optical splitter being configured to be different from the gateway for different branch port connections. That is, the master gateway can identify the branch ports connected with each slave gateway according to the change amplitude of the optical power reported by each slave gateway, so that topology information can be conveniently determined.

In some possible embodiments, the at least one optical splitter further includes a second optical splitter, the second optical splitter being configured to vary in amplitude of optical power variation from the gateway for different branch ports. The optical power variation parameters further comprise optical power variation frequencies, wherein the first optical splitter configures first optical power variation frequencies for the slave gateways connected with all branch ports, the second optical splitter configures second optical power variation frequencies for the slave gateways connected with all branch ports, and the first optical power variation frequencies are different from the second optical power variation frequencies. That is, the master gateway can identify the optical splitters connected with the slave gateways according to the optical power change frequency reported by the slave gateways, so that topology information can be conveniently determined.

In some possible embodiments, the at least one optical splitter further includes a second optical splitter, where the second optical splitter is configured to have different optical power variation ranges for slave gateways connected to different branch ports, and the optical power variation ranges for slave gateways connected to the branch ports with the same port numbers on the first optical splitter and the second optical splitter are the same. The statistical information also includes a received signal strength indication (RECEIVED SIGNAL STRENGTH Indicator, RSSI) and/or Round Trip Time (RTT) of the slave gateway, where the RSSI and/or RTT of the slave gateway connected to the same port number branch ports on the first optical splitter and the second optical splitter are different.

In this embodiment, the optical power disturbance amplitude of each optical splitter is different for different branch ports, and the optical power disturbance amplitude of different optical splitters for the same branch port of the port number is the same. The master gateway can identify the same group of slave gateways with the same port numbers according to different optical power variation amplitudes, and then distinguish the same group of slave gateways with the same port numbers according to RSSI and/or RTT, so as to identify the optical splitters respectively connected with the same group of slave gateways, and realize topology restoration. For example, the larger the RSSI, the more forward the cascade position of the optical splitter connected from the gateway, and the smaller the RTT, the more forward the cascade position of the optical splitter connected from the gateway.

In some possible embodiments, the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation frequency, the first optical splitter being configured to be different for different branch ports connected to the optical power variation frequency configured from the gateway. That is, the master gateway can identify the branch ports connected with each slave gateway according to the optical power change frequency reported by each slave gateway, so that topology information can be conveniently determined.

In some possible embodiments, the at least one optical splitter further comprises a second optical splitter, the second optical splitter being configured to vary the frequency of optical power changes from the gateway for different branch ports. The optical power variation parameters further comprise optical power variation amplitudes, wherein the first optical splitter configures first optical power variation amplitudes for the slave gateways connected with all branch ports, the second optical splitter configures second optical power variation amplitudes for the slave gateways connected with all branch ports, and the first optical power variation amplitudes are different from the second optical power variation amplitudes. That is, the master gateway can identify the optical splitters connected with the slave gateways according to the change amplitude of the optical power reported by the slave gateways, so that topology information can be conveniently determined.

In some possible embodiments, the at least one optical splitter further includes a second optical splitter, where the second optical splitter is configured to have different optical power change frequencies for slave gateways connected to different branch ports, and the optical power change frequencies for slave gateways connected to the branch ports with the same port numbers on the first optical splitter and the second optical splitter are the same. The statistical information also comprises RSSI and/or RTT of the slave gateway, wherein the RSSIs and/or RTT of the slave gateway connected by the branch ports with the same port numbers on the first optical splitter and the second optical splitter are different.

In this embodiment, the optical power disturbance frequency of each optical splitter is different for different branch ports, and the optical power disturbance frequency of different optical splitters for the same branch port of the port number is the same. The master gateway can identify the same group of slave gateways with the same port numbers according to different optical power change frequencies, and then distinguish the same group of slave gateways with the same port numbers according to RSSI and/or RTT, so as to identify the optical splitters respectively connected with the same group of slave gateways, and realize topology restoration. For example, the larger the RSSI, the more forward the cascade position of the optical splitter connected from the gateway, and the smaller the RTT, the more forward the cascade position of the optical splitter connected from the gateway.

In some possible implementations, the optical power variation parameter is counted by the slave gateway during a first period of time, and the RSSI and/or RTT is counted by the slave gateway during a second period of time. That is, the optical splitter performs optical power disturbance on each branch port in the first period, and stops detouring to recover normal optical power in the second period.

In some possible implementations, the request message and the response message employ an optical network unit management control interface (MANAGEMENT AND Control Interface, OMCI) message format or an operation and maintenance management (Operation Administration AND MAINTENANCE, OAM) message format to adapt to existing standards.

In some possible embodiments, the optical fiber connected to each branch port of the optical splitter is made of a thermo-optical material, and the optical power variation parameters configured from the gateway, which are connected to different branch ports of the optical splitter, are different by applying different voltages to the optical fibers connected to different branch ports of the optical splitter. It should be appreciated that this embodiment provides a specific way of implementing the optical power perturbation, with simpler implementation and less modification to the structure employed.

In some possible embodiments, the method further comprises: the main gateway sends a configuration message to each optical splitter, wherein the configuration message is used for indicating each optical splitter to configure corresponding optical power variation parameters for the slave gateway connected with different branch ports. That is, the optical splitter performs optical power disturbance on each branch port according to the configuration of the main gateway, that is, performs centralized management through the main gateway, and is more beneficial to acquiring topology information in real time.

In a second aspect, an embodiment of the present application provides a method for generating topology information, where the method is applied to an optical communication system, where the optical communication system includes a master gateway, at least one optical splitter, and at least one slave gateway, where the master gateway is connected to the at least one optical splitter in a cascade manner, and each slave gateway is connected to a branch port of a corresponding optical splitter. The method comprises the following steps: the slave gateway receives the request message sent by the master gateway. And acquiring statistical information from the gateway according to the request message, wherein the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports. The slave gateways send response messages including statistical information to the master gateway, so that the master gateway generates topology information according to the response messages, and the topology information includes the connection relation between each slave gateway and the branch port of the corresponding optical splitter.

In some possible embodiments, the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation amplitude, the first optical splitter being configured to be different from the gateway for different branch port connections.

In some possible embodiments, the at least one optical splitter further includes a second optical splitter, the second optical splitter being configured to vary in amplitude of optical power variation from the gateway for different branch ports. The optical power variation parameters further comprise optical power variation frequencies, wherein the first optical splitter configures first optical power variation frequencies for the slave gateways connected with all branch ports, the second optical splitter configures second optical power variation frequencies for the slave gateways connected with all branch ports, and the first optical power variation frequencies are different from the second optical power variation frequencies.

In some possible embodiments, the at least one optical splitter further includes a second optical splitter, where the second optical splitter is configured to have different optical power variation ranges for slave gateways connected to different branch ports, and the optical power variation ranges for slave gateways connected to the branch ports with the same port numbers on the first optical splitter and the second optical splitter are the same. The statistical information also comprises RSSI and/or RTT of the slave gateway, wherein the RSSIs and/or RTT of the slave gateway connected by the branch ports with the same port numbers on the first optical splitter and the second optical splitter are different.

In some possible embodiments, the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation frequency, the first optical splitter being configured to be different for different branch ports connected to the optical power variation frequency configured from the gateway.

In some possible embodiments, the at least one optical splitter further comprises a second optical splitter, the second optical splitter being configured to vary the frequency of optical power changes from the gateway for different branch ports. The optical power variation parameters further comprise optical power variation amplitudes, wherein the first optical splitter configures first optical power variation amplitudes for the slave gateways connected with all branch ports, the second optical splitter configures second optical power variation amplitudes for the slave gateways connected with all branch ports, and the first optical power variation amplitudes are different from the second optical power variation amplitudes.

In some possible implementations, the optical power variation parameter is counted by the slave gateway during a first period of time, and the RSSI and/or RTT is counted by the slave gateway during a second period of time.

In some possible implementations, the request message and the response message are in OMCI message format or OAM message format.

In some possible embodiments, the optical fiber connected to each branch port of the optical splitter is made of a thermo-optical material, and the optical power variation parameters configured from the gateway, which are connected to different branch ports of the optical splitter, are different by applying different voltages to the optical fibers connected to different branch ports of the optical splitter.

In a third aspect, an embodiment of the present application provides a primary gateway, where the primary gateway includes: the system comprises a processing unit and a receiving and transmitting unit, wherein a master gateway is connected with at least one optical splitter in a cascading mode, and each slave gateway is connected with a branch port of the corresponding optical splitter. The receiving and transmitting unit is used for: and sending a request message to each slave gateway, wherein the request message is used for requesting each slave gateway to acquire and feed back statistical information, and the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports. The receiving and transmitting unit is used for: at least one response message sent from the gateway is received, the response message including statistical information. The processing unit is used for: and generating topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and the branch port of the corresponding optical splitter.

In some possible embodiments, the transceiver unit is further configured to: and sending a configuration message to each optical splitter, wherein the configuration message is used for indicating each optical splitter to configure corresponding optical power variation parameters for slave gateways connected with different branch ports.

In a fourth aspect, an embodiment of the present application provides a slave gateway, including: the device comprises a processing unit and a receiving and transmitting unit, wherein the slave gateway is connected with a branch port of a corresponding optical splitter, and the master gateway is connected with at least one optical splitter in a cascading mode. The receiving and transmitting unit is used for: and receiving a request message sent by the main gateway. The processing unit is used for: and acquiring statistical information according to the request message, wherein the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway and connected with different branch ports. The receiving and transmitting unit is used for: and sending a response message comprising the statistical information to the master gateway, so that the master gateway generates topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and the branch port of the corresponding optical splitter.

In the embodiment of the application, the master gateway sends a request message to the slave gateway, and the request message is used for requesting the slave gateway to acquire and feed back the statistical information. The optical splitter performs disturbance on optical power of the slave gateway connected with each branch port, so that optical power change of the slave gateway is caused, the statistical information comprises optical power change parameters of the slave gateway, and the optical power change parameters of the slave gateway configured by the optical splitter for different branch ports are different. And the master gateway generates topology information according to the statistical information reported by the slave gateways, so as to determine the connection relation between each slave gateway and the branch port of the corresponding optical splitter. In this way, the current topology information of the FTTR network can be obtained in real time through the interaction between the master gateway and each slave gateway, so that the FTTR network can be managed and maintained effectively.

Drawings

FIG. 1 is a schematic diagram of a system architecture of an FTTH;

FIG. 2 is a schematic diagram of a system architecture of FTTR;

FIG. 3 is a schematic diagram of a first embodiment of a method for generating topology information according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an optical splitter according to an embodiment of the present application;

fig. 5 is a schematic diagram of a network topology according to an embodiment of the present application;

FIG. 6 is a diagram of a second embodiment of a method of generating topology information in an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a possible primary gateway according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another possible primary gateway according to an embodiment of the present application;

Fig. 9 is a schematic structural diagram of a possible slave gateway according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another possible slave gateway according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a method for generating topology information and related equipment, which can acquire FTTR current topology information of a network in real time through interaction between a master gateway and each slave gateway, thereby being convenient for effectively managing and maintaining the FTTR network. It should be noted that the terms "first," "second," and the like in the description and the claims and the above figures are used for distinguishing between similar objects and not necessarily for limiting a particular order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than described of illustrated herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

A passive optical network (passive optical network, PON) is one implementation of an optical access network, PON being a point-to-multipoint transmission optical access technology. The current PON system is mainly used in a fiber to the home (fiber to the home, FTTH) scenario, where each home subscriber has only one ONU.

Fig. 1 is a schematic diagram of a system architecture of FTTH. The OLT is connected to an upper-layer network-side device (e.g., a switch, a router, etc.), and the lower-layer is connected to one or more optical distribution networks (optical distribution network, ODNs). The ODN includes a passive optical splitter for optical power distribution, a trunk fiber connected between the passive optical splitter and the OLT, and a branch fiber connected between the passive optical splitter and the ONU. When data is transmitted in a downlink mode, the ODN transmits the data of the downlink of the OLT to each ONU through the optical splitter, and the ONU selectively receives the downlink data carrying the self identifier. When data is transmitted in the uplink, the ODN combines optical signals sent by the N paths of ONUs into one path of optical signals to be transmitted to the OLT. The ONU provides a user side interface for the OAN and is connected with the ODN. If the ONU simultaneously provides a subscriber port function, such as the ONU provides an ethernet subscriber port or a legacy telephone service (plain old telephone service, POTS) subscriber port, it is called an optical network terminal (optical network termination, ONT).

On the basis of FTTH, in order to solve the problem of home network WIFI coverage, the optical fiber can be further extended into a resident room. And the ONU is arranged in the room, so that the distance between the user terminal and the ONU is reduced, and the signal quality is improved. This application scenario is referred to as fiber-to-room (Fiber to the Room, FTTR).

FIG. 2 is a schematic diagram of a system architecture of FTTR. The FTTR network and the FTTH network can be regarded as a two-stage PON system. An OLT in a first-stage PON system (FTTH) is disposed in a central office, and an ONU is disposed in an information box of a home. The main gateway in the second-level PON system (FTTR) may be deployed in the information box of the home instead of the ONU in the FTTH, where the main gateway has a similar function to the OLT in the FTTH scenario in the FTTR scenario, and may also have a similar function to the ONU in the FTTH scenario. That is, the main gateway FTTR is a device having functions of OLT and ONU, and can be used as a network device that plays a role in the up-down between FTTH and FTTR. The slave gateway FTTR may be deployed in each room of the home for connection with the user terminal, and the slave gateway and the ONUs in the FTTH are essentially the same type of network device. In contrast, ONUs in FTTH are typically deployed in an information box and are typically separated from a user terminal by an Access Point (AP). And FTTR, the slave gateway enters each room and has the function of an AP, and can directly perform WiFi connection with the user terminal.

It should be appreciated that a plurality of slave gateways may be deployed in FTTR, each slave gateway being connected at a drop port of a corresponding optical splitter. The present application is not limited to the number of optical splitters FTTR, and the main gateway and each optical splitter are connected in cascade. The master gateway can realize unified management and configuration of all the slave gateways. For example, the main gateway is used as a control center of the home network, can configure the WiFi hot spot of the whole house as a unified network, optimize channels so as to avoid interference, can control roaming and switching of the user terminal, reduce network switching time and improve user experience.

Fig. 3 is a schematic diagram of a first embodiment of a method for generating topology information according to an embodiment of the present application. In this example, the method of generating topology information includes the following steps.

301. The primary gateway sends a configuration message to the optical splitter.

In one possible implementation, the optical splitter may be configured locally according to a configuration message sent by the master gateway, so that the optical power of each branch port may be disturbed according to the configuration, so that each slave gateway detects a corresponding optical power change. It should be understood that in another possible implementation, the optical splitter may be configured locally in advance, i.e. without requiring the primary gateway to send a configuration message to the optical splitter again.

302. The optical splitter performs optical power disturbance on each branch port.

The optical power perturbation of each branch port refers to adjusting the output optical power of each branch port. Optical power perturbations include, but are not limited to, the amplitude of the optical power perturbation and the frequency of the optical power perturbation. The optical power disturbance rules of the optical splitters on different branch ports are different, namely, the optical power variation parameters of the optical splitters, which are configured from the gateway and are connected with the different branch ports, are different, and the optical power variation parameters include, but are not limited to, optical power variation amplitude and optical power variation frequency. For example, the optical splitter performs optical power disturbance on different branch ports with different disturbance amplitudes, i.e. different detected optical power variation amplitudes from the gateway. For another example, the optical splitter may perform optical power disturbance on different branch ports at different disturbance frequencies, that is, different frequencies of optical power changes detected from the gateway, or different times of optical power changes detected from the gateway unit period.

Fig. 4 is a schematic structural diagram of an optical splitter according to an embodiment of the present application. As shown in fig. 4, a micro control unit (Microcontroller Unit, MCU) is added in the optical splitter, and the MCU can fire the electrode program for disturbing different branch ports according to the configuration message sent by the main gateway or the preset configuration. In one possible implementation, the optical fiber connected to each branch port of the optical splitter is made of a thermo-optical material, and when a voltage is applied to the outer skin layer of the thermo-optical material to cause a temperature change, part of light field energy escapes from the outer skin layer, so that the aim of adjusting the light attenuation by using the MCU is achieved. It should be understood that the intensity of the voltage applied by the MCU to each of the branch ports determines the disturbance amplitude of the optical power, and the frequency of the voltage applied by the MCU to each of the branch ports determines the disturbance frequency of the optical power.

303. The master gateway sends a request message to the slave gateway.

The master gateway sends a request message to the slave gateway to request the slave gateway to perform optical power detection, thereby obtaining an optical power variation parameter for reflecting the optical power disturbance condition.

304. Statistical information is obtained from the gateway.

It should be noted that the statistical information obtained from the gateway includes, but is not limited to, an optical power variation parameter, for example, the statistical information may also include a Received Signal Strength Indicator (RSSI) and/or Round Trip Time (RTT) from the gateway, and other embodiments will be described below.

305. And the slave gateway sends a response message carrying the statistical information to the master gateway.

It should be noted that the present application is not limited to the format of the interaction message between the master gateway and the slave gateway, for example, an existing message format may be adopted to adapt to the existing standard. As an example, when the master gateway and the slave gateway use the GPON format, the request message and the response message may be in an optical network unit management control interface (MANAGEMENT AND Control Interface, OMCI) message format. As shown in table 1 below, a new definition may be made in the corresponding field of the OMCI message for indicating the optical power variation parameter.

TABLE 1

As another example, when the master gateway and the slave gateway use EPON standards, the request message and the response message may be in an operation and maintenance administration (Operation Administration AND MAINTENANCE, OAM) message format. As shown in table 2 below, a new field may be added to the OAM message to indicate the optical power change parameter.

TABLE 2

It should be understood that, in addition to the OMCI message and the OAM message described above, the message format of the interaction between the master gateway and the slave gateway may also be a message in other formats, such as an ethernet message. In addition, in some possible scenarios, an optical-electrical composite cable connection may be further used between the master gateway and the optical splitter and between the optical splitter and the slave gateway, so that interaction between the master gateway and the slave gateway may also be performed through electrical signals.

306. The master gateway generates topology information according to the response message.

The optical splitters perform optical power disturbance of different rules on different branch ports, so that the optical power variation parameters detected by the gateways are different. Therefore, the master gateway can distinguish different slave gateways according to the statistical information reported by each slave gateway, so that the optical splitter connected with each slave gateway and the branch port connected specifically are determined, and topology restoration is realized. It should be understood that in practical applications, different policies may be formulated to identify each optical splitter connected to the slave gateway and the branching port of the specific connection, and several possible embodiments are described below.

Embodiment 1: different slave gateways connected with the same optical splitter are distinguished through the disturbance amplitude of the optical power, and different optical splitters are distinguished through the disturbance frequency of the optical power.

Fig. 5 is a schematic diagram of a network topology according to an embodiment of the present application. As shown in fig. 5, the optical splitters 0,1 and 2 are cascade-connected, the port 0 of the optical splitter 0 is connected to the slave gateway 0, the port 1 of the optical splitter 0 is connected to the slave gateway 1, the port 0 of the optical splitter 1 is connected to the slave gateway 2, the port 1 of the optical splitter 1 is connected to the slave gateway 3, the port 0 of the optical splitter 2 is connected to the slave gateway 4, and the port 1 of the optical splitter 2 is connected to the slave gateway 5.

Taking fig. 5 as an example, the optical power disturbance frequency of each optical splitter is the same for all the branch ports, the optical power disturbance amplitude of each optical splitter is different for different branch ports, and the optical power disturbance frequency of different optical splitters is different. For example, the optical power disturbance frequency adopted by the optical splitter 0 for all ports is f0, the optical power disturbance frequency adopted by the optical splitter 1 for all ports is f1, and the optical power disturbance frequency adopted by the optical splitter 2 for all ports is f2. The optical power disturbance amplitude adopted by the optical splitter 0 to the port 0 is p0, and the optical power disturbance amplitude adopted by the optical splitter 0 to the port 1 is p1. The optical power disturbance amplitude adopted by the optical splitter 1 to the port 0 is p2, and the optical power disturbance amplitude adopted by the optical splitter 0 to the port 1 is p3. The optical power disturbance amplitude adopted by the optical splitter 2 for the port 0 is p4, and the optical power disturbance amplitude adopted by the optical splitter 2 for the port 1 is p5.

It should be understood that f0, f1 and f2 are different from each other, so that the master gateway can identify the optical splitter connected to each slave gateway according to the optical power change frequency reported by each slave gateway. Further, p0 and p1 are different from each other, p2 and p3 are different from each other, and p4 and p5 are different from each other, so that the master gateway can identify the branch port connected with each slave gateway according to the optical power variation amplitude reported by each slave gateway. Thus, the master gateway knows which optical splitter each slave gateway is connected to and which port is specifically connected to.

Embodiment 2: different slave gateways connected with the same optical splitter are distinguished through the disturbance frequency of the optical power, and different optical splitters are distinguished through the disturbance amplitude of the optical power.

Taking fig. 5 as an example, the optical power disturbance amplitude of each optical splitter is the same for all the branch ports, the optical power disturbance frequency of each optical splitter is different for different branch ports, and the optical power disturbance amplitude of different optical splitters is different. For example, the optical power disturbance amplitude adopted by the optical splitter 0 for all ports is p0, the optical power disturbance amplitude adopted by the optical splitter 1 for all ports is p1, and the optical power disturbance amplitude adopted by the optical splitter 2 for all ports is p2. The optical power disturbance frequency adopted by the optical splitter 0 to the port 0 is f0, and the optical power disturbance frequency adopted by the optical splitter 0 to the port 1 is f1. The optical power disturbance frequency adopted by the optical splitter 1 to the port 0 is f2, and the optical power disturbance frequency adopted by the optical splitter 0 to the port 1 is f3. The optical power disturbance frequency adopted by the optical splitter 2 to the port 0 is f4, and the optical power disturbance frequency adopted by the optical splitter 2 to the port 1 is f5.

It should be understood that p0, p1 and p2 are different from each other, so that the master gateway can identify the optical splitter connected to each slave gateway according to the optical power variation amplitude reported by each slave gateway. Further, f0 and f1 are different from each other, f2 and f3 are different from each other, and f4 and f5 are different from each other, so that the master gateway can identify the branch port connected with each slave gateway according to the optical power change frequency reported by each slave gateway. Thus, the master gateway knows which optical splitter each slave gateway is connected to and which port is specifically connected to.

Fig. 6 is a schematic diagram of a second embodiment of a method for generating topology information according to an embodiment of the present application. In this example, the method of generating topology information includes the following steps.

601. The master gateway sends a request message 1 to the slave gateway.

The master gateway requests the slave gateway to detect RSSI and/or RTT by sending a request message 1 to the slave gateway. It should be understood that at this point the optical splitter has not been performing optical power perturbation on each branch port, and therefore each slave gateway detects the RSSI and/or RTT in the normal state.

602. Statistics 1 are obtained from the gateway.

The slave gateway detects the RSSI and/or RTT according to the request message 1 sent by the master gateway, thereby obtaining the statistical information 1 including the RSSI and/or RTT.

603. The slave gateway sends a response message 1 carrying statistics 1 to the master gateway.

It should be noted that, the format of the interaction message between the master gateway and the slave gateway is not limited in the present application, and the specific format of the request message 1 and the response message 1 may refer to the description related to step 305 in the embodiment shown in fig. 3, which is not repeated here.

604. The primary gateway sends a configuration message to the optical splitter.

605. The optical splitter performs optical power disturbance on each branch port.

Step 604 to step 605 in this embodiment are similar to step 301 to step 302 in the embodiment shown in fig. 3, and will not be described again here.

606. The master gateway sends a request message 2 to the slave gateway.

It should be understood that at this point the optical splitter has begun to perform optical power perturbation on each branch port, the request message 2 is different from the request message 1 described above, and the request message 2 is used to request optical power detection from the gateway, so as to obtain an optical power variation parameter for reflecting the optical power perturbation situation. Wherein the optical power variation parameters include, but are not limited to, an optical power variation amplitude and an optical power variation frequency.

607. Statistics 2 are obtained from the gateway.

It should be understood that the statistics 2 are different from the statistics 1 described above, and the statistics 2 include the optical power variation parameters detected from the gateway.

608. The slave gateway sends a response message 2 carrying statistics 2 to the master gateway.

It should be noted that, the format of the interaction message between the master gateway and the slave gateway is not limited in the present application, and the specific format of the request message 2 and the response message 2 may refer to the description related to step 305 in the embodiment shown in fig. 3, which is not repeated here.

609. The primary gateway generates topology information from response message 1 and response message 2.

Since the optical splitters perform optical power disturbance of different rules on different branch ports, the optical power variation parameters detected by the gateways connected to the same optical splitter are different. Therefore, the master gateway can distinguish different slave gateways connected with the same optical splitter according to the statistical message 2 reported by each slave gateway, so as to determine the branch port connected with each slave gateway. And furthermore, the ports with the same port numbers on different optical splitters adopt optical power disturbance with the same rule, so that the master gateway can also distinguish the same group of slave gateways with the same port numbers according to the statistical message 1 reported by each slave gateway, thereby identifying the optical splitters respectively connected with the same group of slave gateways. For example, the larger the RSSI, the more forward the cascade position of the optical splitter connected from the gateway, and the smaller the RTT, the more forward the cascade position of the optical splitter connected from the gateway. The main gateway synthesizes the statistical information 1 and the statistical information 2 to realize topology restoration. It should be understood that in practical applications, different policies may be formulated in combination with statistics 1 and statistics 2 to identify each optical splitter connected to the slave gateway and a specific connected drop port, and several possible embodiments are described below.

Embodiment 3: the different slave gateways connected with the same optical splitter are distinguished through the disturbance amplitude of the optical power, and the optical splitter connected with the slave gateway is identified through RSSI and/or RTT.

Taking fig. 5 as an example, the optical power disturbance amplitude of each optical splitter is different for different branch ports, and the optical power disturbance amplitude of different optical splitters for the branch ports with the same port number is the same. For example, the optical power disturbance amplitude applied to the port 0 by the optical splitter 0 is p0, and the optical power disturbance amplitude applied to the port 1 by the optical splitter 0 is p1. The optical power disturbance amplitude adopted by the optical splitter 1 to the port 0 is p0, and the optical power disturbance amplitude adopted by the optical splitter 0 to the port 1 is p1. The optical power disturbance amplitude adopted by the optical splitter 2 for the port 0 is p0, and the optical power disturbance amplitude adopted by the optical splitter 2 for the port 1 is p1.

It should be understood that p0 and p1 are different from each other, so that the master gateway can identify the branch ports connected to each slave gateway according to the optical power variation amplitude reported by each slave gateway. It can be seen that the optical power variation amplitudes detected from gateway 0, from gateway 2, and from gateway 4 are p0, and the optical power variation amplitudes detected from gateway 1, from gateway 3, and from gateway 5 are p1. For the detected RSSI, slave gateway 0 > slave gateway 2 > slave gateway 4, slave gateway 1 > slave gateway 3 > slave gateway 5. For the detected RTT, slave gateway 0 < slave gateway 2 < slave gateway 4, slave gateway 1 < slave gateway 3 < slave gateway 5. Based on this, it can be inferred that the slave gateway 0 and the slave gateway 1 are connected to the optical splitter 0, the slave gateway 2 and the slave gateway 3 are connected to the optical splitter 1, and the slave gateway 4 and the slave gateway 5 are connected to the optical splitter 2.

Embodiment 4: different slave gateways connected with the same optical splitter are distinguished through the disturbance frequency of the optical power, and the optical splitter connected with the slave gateway is identified through RSSI and/or RTT.

Taking fig. 5 as an example, the optical power disturbance frequency of each optical splitter is different for different branch ports, and the optical power disturbance frequency of different optical splitters for the branch ports with the same port number is the same. For example, the optical power disturbance frequency employed by the optical splitter 0 for the port 0 is f0, and the optical power disturbance frequency employed by the optical splitter 0 for the port 1 is f1. The optical power disturbance frequency adopted by the optical splitter 1 to the port 0 is f0, and the optical power disturbance frequency adopted by the optical splitter 0 to the port 1 is f1. The optical power disturbance frequency adopted by the optical splitter 2 to the port 0 is f0, and the optical power disturbance frequency adopted by the optical splitter 2 to the port 1 is f1.

It should be understood that f0 and f1 are different from each other, so that the master gateway can identify the branch ports connected to each slave gateway according to the optical power change frequency reported by each slave gateway. It can be seen that the optical power change frequencies detected from gateway 0, from gateway 2, and from gateway 4 are all f0, and the optical power change frequencies detected from gateway 1, from gateway 3, and from gateway 5 are all f1. For the detected RSSI, slave gateway 0 > slave gateway 2 > slave gateway 4, slave gateway 1 > slave gateway 3 > slave gateway 5. For the detected RTT, slave gateway 0 < slave gateway 2 < slave gateway 4, slave gateway 1 < slave gateway 3 < slave gateway 5. Based on this, it can be inferred that the slave gateway 0 and the slave gateway 1 are connected to the optical splitter 0, the slave gateway 2 and the slave gateway 3 are connected to the optical splitter 1, and the slave gateway 4 and the slave gateway 5 are connected to the optical splitter 2.

In summary, in the embodiment of the present application, the master gateway sends a request message to the slave gateway, where the request message is used to request the slave gateway to acquire and feed back the statistical information. The optical splitter performs disturbance on optical power of the slave gateway connected with each branch port, so that optical power change of the slave gateway is caused, the statistical information comprises optical power change parameters of the slave gateway, and the optical power change parameters of the slave gateway configured by the optical splitter for different branch ports are different. And the master gateway generates topology information according to the statistical information reported by the slave gateways, so as to determine the connection relation between each slave gateway and the branch port of the corresponding optical splitter. In this way, the current topology information of the FTTR network can be obtained in real time through the interaction between the master gateway and each slave gateway, so that the FTTR network can be managed and maintained effectively.

The master gateway and the slave gateway provided by the embodiment of the application are described below.

Fig. 7 is a schematic structural diagram of a possible primary gateway according to an embodiment of the present application. The primary gateway comprises a processing unit 701 and a transceiving unit 702. Specifically, the transceiver unit 702 is configured to perform the operations of messaging by the primary gateway in the embodiments shown in fig. 3 and 6, and the processing unit 701 is configured to perform other operations of the primary gateway other than messaging in the embodiments shown in fig. 3 and 6.

Fig. 8 is a schematic structural diagram of another possible primary gateway according to an embodiment of the present application. The primary gateway comprises a processor 801 and a transceiver 802, the processor 801 and the transceiver 802 being interconnected by wires. It should be noted that, the transceiver 802 is configured to perform the operations of messaging by the primary gateway in the embodiments shown in fig. 3 and 6. The processor 801 is configured to perform other operations of the primary gateway than messaging in the embodiments illustrated in fig. 3 and 6 described above. In some possible embodiments, the processor 801 includes the processing unit 701 described above, and the transceiver 802 includes the transceiver unit 702 described above. Optionally, the primary gateway may further comprise a memory 803, wherein the memory 803 is used for storing program instructions and data.

Fig. 9 is a schematic structural diagram of a possible slave gateway according to an embodiment of the present application. The slave gateway comprises a processing unit 901 and a transceiving unit 902. Specifically, the transceiver unit 902 is configured to perform the operations of messaging from the gateway in the embodiments shown in fig. 3 and 6, and the processing unit 901 is configured to perform operations from the gateway other than messaging in the embodiments shown in fig. 3 and 6.

Fig. 10 is a schematic structural diagram of another possible slave gateway according to an embodiment of the present application. The slave gateway includes a processor 1001 and a transceiver 1002, and the processor 1001 and the transceiver 1002 are connected to each other by a line. It should be noted that, the transceiver 1002 is configured to perform the operations of messaging from the gateway in the embodiments shown in fig. 3 and 6. The processor 1001 is configured to perform other operations from the gateway than messaging in the embodiments shown in fig. 3 and 6 described above. In some possible embodiments, the processor 1001 includes the processing unit 901 described above, and the transceiver 1002 includes the transceiver unit 902 described above. Optionally, the slave gateway may further comprise a memory 1003, wherein the memory 1003 is for storing program instructions and data.

It should be noted that the processors shown in fig. 8 and fig. 10 may be general-purpose central processing units (Central Processing Unit, CPU), microprocessors, application specific integrated circuits ASICs, or at least one integrated circuit for executing related programs, so as to implement the technical solutions provided by the embodiments of the present application. The memory shown in fig. 8 and 10 described above may store an operating system and other application programs. When the technical scheme provided by the embodiment of the application is implemented by software or firmware, program codes for implementing the technical scheme provided by the embodiment of the application are stored in a memory and executed by a processor. In one embodiment, the processor may include memory within. In another embodiment, the processor and the memory are two separate structures.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

Those of ordinary skill in the art will appreciate that all or a portion of the steps implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing the relevant hardware, where the program may be stored in a computer readable storage medium, where the storage medium may be a read-only memory, a random access memory, etc. Specifically, for example: the processing unit or processor may be a central processing unit, a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

When implemented in software, the method steps described in the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk Solid STATE DISK (SSD)), etc.

Claims

1. A method of generating topology information, the method being applied to an optical communication system including a master gateway, at least one optical splitter, and at least one slave gateway, the master gateway being connected to the at least one optical splitter in a cascade, each of the slave gateways being connected to a branch port of a corresponding optical splitter, the method comprising:

The master gateway sends a request message to each slave gateway, wherein the request message is used for requesting each slave gateway to acquire and feed back statistical information, the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports;

the master gateway receives a response message sent by the at least one slave gateway, wherein the response message comprises the statistical information;

and the master gateway generates topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and a branch port of the corresponding optical splitter.

2. The method of claim 1, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation magnitude, the first optical splitter configured to vary the optical power variation magnitude from the gateway for different branch port connections.

3. The method of claim 2, wherein the at least one optical splitter further comprises a second optical splitter configured to vary in amplitude of optical power variation from the gateway for different branch port connections;

The optical power variation parameters further comprise optical power variation frequencies, wherein the first optical splitter configures first optical power variation frequencies for slave gateways connected with all branch ports, the second optical splitter configures second optical power variation frequencies for slave gateways connected with all branch ports, and the first optical power variation frequencies are different from the second optical power variation frequencies.

4. The method of claim 2, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter being configured to have different magnitudes of optical power variation for slave gateways to which different branch ports are connected, the magnitudes of optical power variation for slave gateways to which the same port numbers on the first optical splitter and the second optical splitter are connected being the same;

The statistical information also comprises the received signal strength indication RSSI and/or round trip time RTT of the slave gateway, wherein the RSSIs and/or RTTs of the slave gateways connected by the branch ports with the same port numbers on the first optical splitter and the second optical splitter are different.

5. The method of claim 1, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation frequency, the first optical splitter configured to be different from a gateway for different branch port connections.

6. The method of claim 5, wherein the at least one optical splitter further comprises a second optical splitter configured to vary the frequency of optical power changes from the gateway for different branch port connections;

The optical power variation parameters further comprise optical power variation amplitude, wherein the first optical splitter configures first optical power variation amplitude for the slave gateways connected with all branch ports, the second optical splitter configures second optical power variation amplitude for the slave gateways connected with all branch ports, and the first optical power variation amplitude is different from the second optical power variation amplitude.

7. The method of claim 5, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter having different frequencies of optical power variation configured for slave gateways to which different branch ports are connected, the first optical splitter and the second optical splitter having the same frequency of optical power variation from the slave gateways to which the same port number of the branch ports is connected;

8. The method according to claim 4 or 7, characterized in that the optical power variation parameter is counted by the slave gateway during a first period of time, and the RSSI and/or the RTT is counted by the slave gateway during a second period of time.

9. The method according to any one of claims 1 to 8, wherein the request message and the response message are in an optical network unit management control interface OMCI message format or an operation maintenance administration OAM message format.

10. The method according to any one of claims 1 to 9, wherein the optical fiber accessed by each branch port of the optical splitter is made of thermo-optical material, and the optical fiber accessed by different branch ports of the optical splitter is configured from a gateway to have different optical power variation parameters by applying different voltages to achieve different branch port connections.

11. The method according to any one of claims 1 to 10, further comprising:

And the master gateway sends a configuration message to each optical splitter, wherein the configuration message is used for indicating each optical splitter to configure corresponding optical power change parameters for slave gateways connected with different branch ports.

12. A method of generating topology information, the method being applied to an optical communication system including a master gateway, at least one optical splitter, and at least one slave gateway, the master gateway being connected to the at least one optical splitter in a cascade, each of the slave gateways being connected to a branch port of a corresponding optical splitter, the method comprising:

The slave gateway receives a request message sent by the master gateway;

The slave gateway acquires statistical information according to the request message, wherein the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured by the slave gateway and connected with different branch ports;

and the slave gateway sends a response message comprising statistical information to the master gateway so that the master gateway generates topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and a branch port of a corresponding optical splitter.

13. The method of claim 12, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation magnitude, the first optical splitter configured to vary the optical power variation magnitude from the gateway for different branch port connections.

14. The method of claim 13, wherein the at least one optical splitter further comprises a second optical splitter configured to vary in amplitude of optical power variation from the gateway for different branch port connections;

15. The method of claim 13, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter being configured to have different magnitudes of optical power variation for slave gateways to which different branch ports are connected, the magnitudes of optical power variation for slave gateways to which the same port numbers on the first optical splitter and the second optical splitter are connected being the same;

16. The method of claim 12, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation frequency, the first optical splitter configured to vary the optical power variation frequency from the gateway for different branch port connections.

17. The method of claim 16, wherein the at least one optical splitter further comprises a second optical splitter configured to vary the frequency of optical power changes from the gateway for different branch port connections;

18. The method of claim 16, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter having different frequencies of optical power variation configured for slave gateways to which different branch ports are connected, the first optical splitter and the second optical splitter having the same frequency of optical power variation from the slave gateways to which the same port number of the branch ports is connected;

19. The method according to claim 15 or 18, wherein the optical power variation parameter is counted by the slave gateway during a first period of time, and wherein the RSSI and/or the RTT is counted by the slave gateway during a second period of time.

20. The method according to any one of claims 12 to 19, wherein the request message and the response message are in an optical network unit management control interface OMCI message format or an operation maintenance administration OAM message format.

21. A method according to any one of claims 12 to 20, wherein the fibres accessed by each branch port of the optical splitter are of thermo-optic material, and the fibres accessed by different branch ports of the optical splitter are configured from the gateway to have different optical power variation parameters by applying different voltages to effect different branch port connections.

22. A primary gateway, comprising: the system comprises a processing unit and a receiving and transmitting unit, wherein the main gateway is connected with at least one optical splitter in a cascading mode, and each slave gateway is connected with a branch port of the corresponding optical splitter;

The receiving and transmitting unit is used for: sending a request message to each slave gateway, wherein the request message is used for requesting each slave gateway to acquire and feed back statistical information, and the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports;

Receiving at least one response message sent from a gateway, wherein the response message comprises the statistical information;

The processing unit is used for: and generating topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and a branch port of the corresponding optical splitter.

23. The primary gateway of claim 22, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprises an optical power variation magnitude, and the first optical splitter is configured to vary the optical power variation magnitude for slave gateways connected to different branch ports.

24. The primary gateway of claim 23, wherein the at least one optical splitter further comprises a second optical splitter configured to vary in amplitude of optical power variation for slave gateways connected to different branch ports;

25. The primary gateway of claim 23, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter having different magnitudes of optical power variation configured for the secondary gateway connected to different branch ports, the magnitudes of optical power variation for the secondary gateway connected to the same branch port on the first optical splitter and the second optical splitter being the same;

26. The primary gateway of claim 22, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprises an optical power variation frequency, and the first optical splitter is configured to be different from the gateway for different branch port connections.

27. The primary gateway of claim 26, wherein the at least one optical splitter further comprises a second optical splitter configured to vary the frequency of optical power changes for slave gateways connected to different branch ports;

28. The primary gateway of claim 26, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter having different frequencies of optical power variation configured for the secondary gateway to which different branch ports are connected, the first optical splitter and the second optical splitter having the same frequency of optical power variation for the secondary gateway to which the same port number of the branch ports is connected;

29. The master gateway according to claim 25 or 28, wherein the optical power variation parameter is counted by the slave gateway during a first period of time, and wherein the RSSI and/or the RTT is counted by the slave gateway during a second period of time.

30. The primary gateway of any of claims 22 to 29, wherein the request message and the response message are in an optical network unit management control interface, OMCI, message format or an operation maintenance administration, OAM, message format.

31. The primary gateway of any one of claims 22 to 30, wherein the optical fiber accessed by each branch port of the optical splitter is made of thermo-optic material, and the optical power variation parameters configured from the gateway for different branch port connections by applying different voltages to the optical fibers accessed by different branch ports of the optical splitter are different.

32. The primary gateway of any of claims 22-31, wherein the transceiver unit is further configured to: and sending a configuration message to each optical splitter, wherein the configuration message is used for indicating each optical splitter to configure corresponding optical power variation parameters for slave gateways connected with different branch ports.

33. A slave gateway, comprising: the system comprises a processing unit and a receiving and transmitting unit, wherein the slave gateway is connected with a branch port of a corresponding optical splitter, and the master gateway is connected with at least one optical splitter in a cascading manner;

The receiving and transmitting unit is used for: receiving a request message sent by the main gateway;

the processing unit is used for: acquiring statistical information according to the request message, wherein the statistical information comprises optical power change parameters of the slave gateway, and each optical splitter is different in optical power change parameters configured for the slave gateway connected with different branch ports;

The receiving and transmitting unit is used for: and sending a response message comprising statistical information to the master gateway, so that the master gateway generates topology information according to the response message, wherein the topology information comprises the connection relation between each slave gateway and a branch port of a corresponding optical splitter.

34. The slave gateway according to claim 33, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprises an optical power variation amplitude, and the first optical splitter is configured to be different from the slave gateway for different branch port connections.

35. The slave gateway according to claim 34, wherein the at least one optical splitter further comprises a second optical splitter configured to vary in amplitude of optical power variation for slave gateways to which different branch ports are connected;

36. The slave gateway according to claim 34, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter is configured to have different optical power variation amplitudes for slave gateways connected to different branch ports, and the optical power variation amplitudes for slave gateways connected to the same branch ports on the first optical splitter and the second optical splitter are the same;

37. The slave gateway according to claim 33, wherein the at least one optical splitter comprises a first optical splitter, the optical power variation parameter comprising an optical power variation frequency, the first optical splitter configured to be different from the slave gateway for different branch port connections.

38. The slave gateway according to claim 37, wherein the at least one optical splitter further comprises a second optical splitter configured to vary the frequency of optical power changes for slave gateways to which different branch ports are connected;

39. The slave gateway according to claim 37, wherein the at least one optical splitter further comprises a second optical splitter, the second optical splitter is configured to have different optical power change frequencies for slave gateways connected to different branch ports, and the optical power change frequencies for slave gateways connected to the same branch ports on the first optical splitter and the second optical splitter are the same;

40. A slave gateway according to claim 36 or 39, wherein the optical power variation parameter is counted by the slave gateway during a first period of time and the RSSI and/or RTT is counted by the slave gateway during a second period of time.

41. The slave gateway according to any one of claims 33 to 40, wherein the request message and the response message are in an optical network unit management control interface OMCI message format or an operation maintenance administration OAM message format.

42. The slave gateway according to any one of claims 33 to 41, wherein the optical fiber accessed by each branch port of the optical splitter is made of thermo-optic material, and the optical power variation parameters configured by the slave gateway for different branch port connections by applying different voltages to the optical fibers accessed by different branch ports of the optical splitter are different.