Wavelength channel recovery method and device based on WDM-PON system

Abstract

The invention provides a wavelength channel recovery method and device based on a WDM-PON system, and relates to the technical field of communication, and the method comprises the steps: sending an idle state broadcast message to each wavelength channel at regular time; after it is determined that a wavelength channel establishment request message sent by a target optical network unit is received, a corresponding wavelength channel connection establishment message is established according to the model type of the target optical network unit, and the target optical network unit is an optical network unit which receives an idle state broadcast message and currently needs to recover wavelength channel connection; and sending the wavelength channel connection establishment message to a target optical network unit based on a corresponding target wavelength channel in the wavelength channel connection establishment message so as to establish a communication connection with the target optical network unit through the target wavelength channel, the target wavelength channel is determined from a plurality of wavelength channels in an idle state when wavelength channel connection is allowed to be recovered for the target optical network unit. According to the invention, the recovery efficiency of the service channel is improved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a wavelength channel recovery method and device based on a WDM-PON system. Background Art

[0002] Wavelength Division Multiplexing Passive Optical Network (WDM-PON) is a fiber access technology that combines wavelength division multiplexing (WDM) technology and passive optical network (PON) topology. In WDM-PON systems, switching of specific wavelength channels is one of the key technologies for achieving dynamic bandwidth allocation and fault recovery. This process usually involves the coordinated work of tunable lasers and filtering systems.

[0003] When the system needs to switch wavelength channels, the tunable laser will quickly adjust its output wavelength to the target wavelength, and ensure that only the signal of this wavelength is transmitted to the optical network unit (ONU) through the filtering system. However, when the tunable laser takes a long time to adjust the wavelength, or the filtering system does not respond quickly enough, there may be long switching delays or stability issues, which will affect the stability and reliability of the entire system.

[0004] Therefore, there is an urgent need for a wavelength channel recovery method and device based on a WDM-PON system to solve the above problems. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a wavelength channel recovery method and device based on a WDM-PON system.

[0006] The present invention provides a wavelength channel recovery method based on a WDM-PON system, which is applied to an optical line terminal and includes: Send idle status broadcast messages to each wavelength channel at regular intervals; After determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; Based on the target wavelength channel corresponding to the wavelength channel connection establishment message, the wavelength channel connection establishment message is sent to the target optical network unit to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

[0007] According to a wavelength channel recovery method based on a WDM-PON system provided by the present invention, the timing of sending an idle state broadcast message to each wavelength channel includes: Determine whether each wavelength channel is currently in an idle state; According to the idle state judgment result, an idle state broadcast message is sent to each wavelength channel in the idle state at a fixed time.

[0008] According to a wavelength channel recovery method based on a WDM-PON system provided by the present invention, after determining that a wavelength channel establishment request message sent by a target optical network unit is received, a corresponding wavelength channel connection establishment message is constructed according to the model type of the target optical network unit, including: Determining the model type of the target optical network unit according to the optical network unit type field in the wavelength channel establishment request message; When it is determined that the target optical network unit is an optical network unit having an ITU-T GPON component and a WDM component, it is determined whether the target optical network unit has registered an optical network unit ID, and if so, the wavelength channel connection establishment message is constructed according to the registered ID value; if not, a dynamic ID value is assigned to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value; When it is determined that the target optical network unit is an optical network unit having the WDM component but not the ITU-T GPON module, the dynamic ID value is allocated to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value.

[0009] According to a wavelength channel recovery method based on a WDM-PON system provided by the present invention, the data field information in the idle state broadcast message, the wavelength channel establishment request message and the wavelength channel connection establishment message at least includes WDM channel number information, wavelength channel coding information, optical network unit model type information, wavelength channel status information and optical network unit ID information.

[0010] The present invention also provides a wavelength channel recovery method based on a WDM-PON system, which is applied to an optical network unit and includes: Obtaining idle state broadcast messages periodically sent by the optical line terminal from each wavelength channel; If it is determined that the wavelength channel recovery connection process is currently to be performed, a wavelength channel establishment request message is constructed according to the model type of the optical network unit; The wavelength channel establishment request message is sent to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0011] The present invention also provides an optical line terminal, comprising: A first sending module, which sends idle state broadcast messages to each wavelength channel at a regular interval; A first message construction module is used to construct a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit after determining that a wavelength channel establishment request message sent by the target optical network unit is received, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; A second sending module is used to send the wavelength channel connection establishment message to the target optical network unit based on the corresponding target wavelength channel in the wavelength channel connection establishment message, so as to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from multiple wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

[0012] The present invention also provides an optical network unit, comprising: A message receiving module, used for acquiring idle state broadcast messages regularly sent by the optical line terminal from each wavelength channel; A second message construction module is used to construct a wavelength channel establishment request message according to the model type of the optical network unit if it is determined that the wavelength channel recovery connection process is currently to be performed; a third sending module, configured to send the wavelength channel establishment request message to the optical line terminal, so as to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0013] The present invention also provides a wavelength channel recovery device based on the WDM-PON system, comprising the above optical line terminal, the above optical network unit, and an optical distribution network device arranged between the optical line terminal and the optical network unit.

[0014] The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the wavelength channel recovery method based on the WDM-PON system as described above is implemented.

[0015] The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the wavelength channel recovery method based on the WDM-PON system as described in any one of the above is implemented.

[0016] The wavelength channel recovery method and device based on the WDM-PON system provided by the present invention periodically sends idle state broadcast messages to each wavelength channel through an optical line terminal, and then after receiving a wavelength channel establishment request message sent by a target optical network unit, according to the model type of the optical network unit, the constructed wavelength channel connection establishment message is sent to the target optical network unit, thereby establishing communication between the optical line terminal and the target optical network unit, and improving the recovery efficiency of the service channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the flow charts of the wavelength channel recovery method based on the WDM-PON system provided by the present invention; Figure 2 A schematic diagram of the functions and features of a PLOAM definition message based on the ITU-T GPON standard provided by the present invention; Figure 3 A schematic diagram of an ONU architecture of a first model type provided by the present invention; Figure 4 A schematic diagram of an ONU architecture of a second model type provided by the present invention; Figure 5 The second flowchart of the wavelength channel recovery method based on the WDM-PON system provided by the present invention; Figure 6 A schematic diagram of the structure of the optical line terminal provided by the present invention; Figure 7 A schematic diagram of the structure of the optical network unit provided by the present invention; Figure 8 This is a schematic structural diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In existing WDM-PON systems, the switching of WDM wavelength channels often involves the dynamic switching of tunable lasers and filter systems to specific wavelength channels. However, during the dynamic switching process, there may be long switching delays or stability issues, which in turn affects the rapid recovery efficiency of service channels.

[0021] The present invention aims at the problems existing in the prior art and provides a method for rapid recovery of wavelength channels, so that during the startup or service recovery process of WDM-PON ONU, unnecessary adjustments of the tunable laser and the filter system are reduced, and the wavelength channel is established with the OLT quickly. It should be noted that the OLT, wavelength channel, ONU, etc. mentioned in the subsequent content can all implement and support the rapid recovery method of wavelength channels provided by the present invention. Unless otherwise specified, these terms are understood and used according to the above definitions.

[0022] Figure 1 One of the flow charts of the wavelength channel recovery method based on the WDM-PON system provided by the present invention is as follows: Figure 1 As shown, the present invention provides a wavelength channel recovery method based on a WDM-PON system, which is applied to an optical line terminal (Optical Line Terminal, referred to as OLT), comprising: Step 101: Send idle state broadcast messages to each wavelength channel at a regular interval.

[0023] In the present invention, OLT is one of the core devices of the WDM-PON system, responsible for converting data from the upper network (such as a metropolitan area network or a wide area network) into optical signals and transmitting them to each ONU through the optical distribution network (ODN).

[0024] In the present invention, the OLT will periodically send idle state broadcast messages (abbreviated as WPLOAM-KP) to each wavelength channel. Specifically, the OLT periodically sends downlink idle state broadcast messages to all connected ONU devices for the WMD wavelength channels it supports. Figure 2The function and characteristic diagram of the PLOAM definition message based on the ITU-T GPON standard provided by the present invention can be referred to Figure 2 As shown, the present invention is based on the PLOAM definition message of the existing ITU-T GPON standard, improves the Message ID field and the data field therein, thereby expanding the Message ID field and the data field, and producing related messages for the idle code heartbeat mechanism of the WDM-PON wavelength channel.

[0025] In the present invention, by extending the definition of the Message ID field, a corresponding message is generated during the recovery process of the service channel, including: 1. Wavelength channel idle code heartbeat WPLOAM-KP, that is, idle state broadcast message, which is sent regularly by OLT in each wavelength channel.

[0026] 2. Wavelength channel establishment request message WPLOAM-INFO, which is sent by the ONU to its corresponding wavelength channel and is a request message when the channel is established.

[0027] 3. Wavelength channel connection establishment message WPLOAM-ACK, which is sent by the OLT on a specific WDM channel it supports and is used to establish the message when the channel is established.

[0028] Step 102, after determining that a wavelength channel establishment request message sent by a target optical network unit is received, a corresponding wavelength channel connection establishment message is constructed according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and currently has a wavelength channel connection to be restored.

[0029] In the present invention, the OLT can identify and receive a wavelength channel establishment request from a target optical network unit, and this request usually includes specific parameters of the wavelength channel requested to be established, such as the model type of the ONU. The OLT then constructs a corresponding wavelength channel connection establishment message according to the model type of the ONU. Because different models of ONUs may support different protocols, configurations or characteristics, compatibility needs to be considered when constructing the connection establishment message to ensure the successful establishment of the connection.

[0030] Step 103: Based on the target wavelength channel corresponding to the wavelength channel connection establishment message, the wavelength channel connection establishment message is sent to the target optical network unit to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

[0031] In the present invention, the target wavelength channel is determined by the OLT from a plurality of wavelength channels in an idle state when allowing to restore or establish a new wavelength channel connection for the target optical network unit. Once the target wavelength channel is determined, the OLT sends a wavelength channel connection establishment message to the target optical network unit, and the message includes channel related information.

[0032] When the target optical network unit receives the wavelength channel connection establishment message, it will be configured according to the instructions in the message. Once the configuration is completed, the target optical network unit is ready to establish a communication connection with the OLT at the other end of the target wavelength channel.

[0033] The wavelength channel recovery method based on the WDM-PON system provided by the present invention sends idle state broadcast messages to each wavelength channel through an optical line terminal at regular intervals, and then after receiving a wavelength channel establishment request message sent by a target optical network unit, the constructed wavelength channel connection establishment message is sent to the target optical network unit according to the optical network unit model type, thereby establishing communication between the optical line terminal and the target optical network unit, thereby improving the recovery efficiency of the service channel.

[0034] Based on the above embodiment, the timing of sending an idle state broadcast message to each wavelength channel includes: Determine whether each wavelength channel is currently in an idle state; According to the idle state judgment result, an idle state broadcast message is sent to each wavelength channel in the idle state at a fixed time.

[0035] In the present invention, the OLT periodically checks the usage of each wavelength channel. If a wavelength channel does not carry any valid data transmission within a specific time (ie, no data signal is transmitted on the channel), the wavelength channel is considered to be in an idle state.

[0036] Furthermore, after determining which wavelength channels are in an idle state, the OLT can send idle state broadcast messages (i.e., WPLOAM-KP) only to the WDM wavelength channels in an idle state. For non-idle WDM wavelength channels, the OLT will not send WPLOAM-KP to them, which can effectively avoid sending unnecessary control information on the wavelength channels that have already carried services, thereby saving bandwidth resources on these channels.

[0037] On the basis of the above embodiment, after determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit includes: Determining the model type of the target optical network unit according to the optical network unit type field in the wavelength channel establishment request message; When it is determined that the target optical network unit is an optical network unit having an ITU-T GPON component and a WDM component, it is determined whether the target optical network unit has registered an optical network unit ID, and if so, the wavelength channel connection establishment message is constructed according to the registered ID value; if not, a dynamic ID value is assigned to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value; When it is determined that the target optical network unit is an optical network unit having the WDM component but not the ITU-T GPON module, the dynamic ID value is allocated to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value.

[0038] Figure 3 A schematic diagram of an ONU architecture of a first model type provided by the present invention, Figure 4 The schematic diagram of the ONU architecture of the second model type provided by the present invention can be referred to Figure 3 and Figure 4 As shown, in the present invention, there are two schemes for WDM-PON ONU, one is composed of ITU-T GPON components and WDM components (defined as ONU TYPE1), and the other is only composed of WDM components (defined as ONU TYPE2). In the present invention, in order to be compatible with the existence of these two ONUs, the GPONPLOAM extended negotiation message (abbreviated as WPLOAM) is introduced to realize the digital guidance function of the ONU wavelength channel fast recovery process.

[0039] Further, the present invention firstly expands the Message ID field based on the PLOAM definition of the ITU-T GPON standard to construct the three messages mentioned in the above embodiment, namely, the idle state broadcast message, the wavelength channel establishment request message and the wavelength channel connection establishment message. On the basis of the above embodiment, the data field information in the idle state broadcast message, the wavelength channel establishment request message and the wavelength channel connection establishment message at least includes WDM channel number information, wavelength channel coding information, optical network unit model type information, wavelength channel state information and optical network unit ID information.

[0040] In the present invention, after the definition of the Message ID field is extended, the DATA field (i.e., the data field information in the message) is further extended, and the extended definition includes WDM channel number information (WDM-ID), wavelength channel coding information (WDM-CODE), optical network unit model type information (WDM-MODE), wavelength channel state information (WDM-STATE) and optical network unit ID information (WDM-USER), and the specific contents are as follows: WDM-ID: 2 bytes, indicating the WDM channel number. Each channel number is unique and defined by the OLT.

[0041] WDM-CODE: 2 bytes, indicating the wavelength channel code, which is defined by the OLT. The code of each wavelength channel is different to assist the ONU in dynamic identification when switching channels. Optionally, in one embodiment, this field can also be used for channel encryption key. When the highest bit position is 1, the subsequent 15 bits of data are used to represent the secret key.

[0042] WDM-MODE: 1 byte, defines the current WDM mode of the ONU, that is, ONU TYPE1 or ONU TYPE2.

[0043] WDM-STATE: 1 byte, indicating the idle state of the channel. It is set to 0 in the normal idle state, set to 1 when the connection is allowed to be established, and set to 0xff when the connection is rejected.

[0044] WDM-USER: 2 bytes, indicating that the wavelength channel is valid after it is established, and its value is the ONU ID that uses this wavelength channel.

[0045] The above embodiment defines the basic extension of the DATA field. The first two bytes (i.e., WDM channel number information and wavelength channel coding information) are mainly defined by the OLT, and the last three bytes (i.e., optical network unit model type information, wavelength channel status information and optical network unit ID information) vary according to different Message IDs. The details are as follows: 1. Idle state broadcast message WPLOAM-KP message: WDM-MODE / WDM-USER: invalid; WDM-STATE: The value is 0, indicating that the channel is idle.

[0046] 2. Wavelength channel establishment request message WPLOAM-INFO message: WDM-MODE: The actual type filled in by ONU, that is, ONU TYPE1 or ONU TYPE2; WDM- USER / WDM-STATE: Value is 0 / invalid.

[0047] 3. Wavelength channel connection establishment message WPLOAM-ACK message: WDM-MODE: Fill in the value reported by the current ONU; WDM-STATE: The current state is filled in by OLT to establish the state; WDM-USER: When OLT allows connection, this value is filled with the ONU ID assigned by OLT; among them, the ONU ID of ONU TYPE1 type can be the same as the ONU ID registered based on ITU-T GPON standard PLOAM or allocated by OLT for the first time; the ONU ID ONU of ONUTYPE2 type is allocated by OLT when it is first registered.

[0048] Furthermore, the wavelength channel rapid recovery method provided by the present invention is generally described, and the specific steps are as follows: Step 11: The OLT periodically sends a WPLOAM-KP message to each supported WDM wavelength channel, wherein the OLT does not send a WPLOAM-KP message to a non-idle WDM wavelength channel.

[0049] Step 12: When the WDM ONU needs to restore a wavelength channel, it can send a wavelength channel establishment request message to the OLT through the WDM wavelength channel. For an ONU supporting multiple WDM wavelength channels, multiple such wavelength channel establishment request messages can be sent.

[0050] Step 13, when the OLT receives the wavelength channel establishment request message requested by the ONU, if it allows to establish a channel connection with the ONU, it sends a wavelength channel establishment message to the ONU in the only wavelength channel selected by it; if the OLT refuses to establish a WDM wavelength channel with the ONU, it may not respond or set the WDM-STATE to reject.

[0051] Step 14: For an ONU of ONU TYPE2 type, its ONU ID may be directly allocated by the OLT in a WPLOAM-ACK message when the channel connection is completed.

[0052] Step 15: For an ONU of ONU TYPE1 type, if it has pre-registered with ITU-T GPON standard PLOAM, the ONU ID in the message can be the same as it, otherwise the process is consistent with step 14.

[0053] Step 16, for ONU TYPE1 and ONU TYPE2, if the WMD wavelength channel cannot complete the connection, you can choose whether to switch back to the standard GPON or continue to execute other methods. The present invention does not describe this process in detail.

[0054] The wavelength channel recovery method based on the WDM-PON system provided by the present invention allows the OLT and the ONU to communicate directly in the wavelength channel without wavelength adjustment or switching when the ONU recovers the connection from the wavelength channel of the last normal communication. In addition, for ONU TYPE2, if it only supports a fixed unique or specific WDM wavelength, it can also establish a connection with the OLT through the method provided by the present invention.

[0055] Figure 5 The second flow chart of the wavelength channel recovery method based on the WDM-PON system provided by the present invention is as follows: Figure 5 As shown, the present invention provides a wavelength channel recovery method based on a WDM-PON system, which is applied to an optical network unit, comprising: Step 501, obtaining idle state broadcast messages periodically sent by an optical line terminal from each wavelength channel; Step 502: If it is determined that the wavelength channel recovery connection process is currently to be performed, a wavelength channel establishment request message is constructed according to the model type of the optical network unit; Step 503: Send the wavelength channel establishment request message to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0056] The wavelength channel recovery method based on the WDM-PON system provided by the present invention sends idle state broadcast messages to each wavelength channel through an optical line terminal at regular intervals, and then after receiving a wavelength channel establishment request message sent by a target optical network unit, the constructed wavelength channel connection establishment message is sent to the target optical network unit according to the optical network unit model type, thereby establishing communication between the optical line terminal and the target optical network unit, thereby improving the recovery efficiency of the service channel.

[0057] It should be noted that the wavelength channel recovery method based on the WDM-PON system provided by the present invention, the specific implementation scheme of the method executed by the ONU and the technical effects achieved have been described in the above-mentioned OLT method embodiment and will not be repeated here.

[0058] The optical line terminal and the optical network unit provided by the present invention are described below. The optical line terminal and the optical network unit described below and the wavelength channel recovery method based on the WDM-PON system described above can be referred to each other.

[0059] Figure 6 The schematic diagram of the structure of the optical line terminal provided by the present invention is as follows: Figure 6As shown, the present invention provides an optical line terminal, including a first sending module 601, a first message construction module 602 and a second sending module 603, wherein the first sending module 601 sends an idle state broadcast message to each wavelength channel at a fixed time; the first message construction module 602 is used to construct a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit after determining that a wavelength channel establishment request message sent by a target optical network unit is received, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and currently has a wavelength channel connection to be restored; the second sending module 603 is used to send the wavelength channel connection establishment message to the target optical network unit based on the corresponding target wavelength channel in the wavelength channel connection establishment message, so as to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

[0060] The optical line terminal provided by the present invention sends idle state broadcast messages to each wavelength channel through the optical line terminal at regular intervals, and then after receiving the wavelength channel establishment request message sent by the target optical network unit, according to the optical network unit model type, sends the constructed wavelength channel connection establishment message to the target optical network unit, thereby establishing communication between the optical line terminal and the target optical network unit, and improving the recovery of the service channel.

[0061] Figure 7 A schematic diagram of the structure of the optical network unit provided by the present invention, such as Figure 7 As shown, the present invention provides an optical network unit, including a message receiving module 701, a second message constructing module 702 and a third sending module 703, wherein the message receiving module 701 is used to obtain an idle state broadcast message periodically sent by an optical line terminal from each wavelength channel; the second message constructing module 702 is used to construct a wavelength channel establishment request message according to the model type of the optical network unit if it is determined that the wavelength channel recovery connection process to be performed is currently to be performed; the third sending module 703 is used to send the wavelength channel establishment request message to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0062] The optical network unit provided by the present invention sends idle state broadcast messages to each wavelength channel through an optical line terminal at regular intervals, and then after receiving a wavelength channel establishment request message sent by a target optical network unit, according to the optical network unit model type, sends a constructed wavelength channel connection establishment message to the target optical network unit, thereby establishing communication between the optical line terminal and the target optical network unit, and improving the recovery of the service channel.

[0063] The optical line terminal and optical network unit provided by the present invention are used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for the specific processes and detailed contents, which will not be repeated here.

[0064] The present invention also provides a wavelength channel recovery device based on a WDM-PON system, comprising the optical line terminal and optical network unit described in the above embodiments, and an optical distribution network device arranged between the optical line terminal and the optical network unit.

[0065] The wavelength channel recovery device based on the WDM-PON system provided by the present invention sends idle state broadcast messages to each wavelength channel through an optical line terminal at regular intervals, and then after receiving a wavelength channel establishment request message sent by a target optical network unit, sends a constructed wavelength channel connection establishment message to the target optical network unit according to the optical network unit model type, thereby establishing communication between the optical line terminal and the target optical network unit, thereby improving the recovery efficiency of the service channel.

[0066] Figure 8 A schematic diagram of the structure of an electronic device provided by the present invention, such as Figure 8As shown, the electronic device may include: a processor (Processor) 801, a communication interface (Communications Interface) 802, a memory (Memory) 803 and a communication bus 804, wherein the processor 801, the communication interface 802, and the memory 803 communicate with each other through the communication bus 804. The processor 801 can call the logic instructions in the memory 803 to execute the wavelength channel recovery method based on the WDM-PON system, the method comprising: sending an idle state broadcast message to each wavelength channel at a fixed time; after determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; based on the corresponding target wavelength channel in the wavelength channel connection establishment message, sending the wavelength channel connection establishment message to the target optical network unit, so as to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit; Or, obtaining an idle state broadcast message periodically sent by the optical line terminal from each wavelength channel; if it is determined that the wavelength channel recovery connection process is currently to be performed, constructing a wavelength channel establishment request message according to the model type of the optical network unit; sending the wavelength channel establishment request message to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0067] In addition, the logic instructions in the above-mentioned memory 803 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk.

[0068] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer, the computer can execute the wavelength channel recovery method based on the WDM-PON system provided by the above methods, the method comprising: sending an idle state broadcast message to each wavelength channel at a regular interval; after determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; based on the corresponding target wavelength channel in the wavelength channel connection establishment message, sending the wavelength channel connection establishment message to the target optical network unit, so as to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit; Or, obtaining an idle state broadcast message periodically sent by the optical line terminal from each wavelength channel; if it is determined that the wavelength channel recovery connection process is currently to be performed, constructing a wavelength channel establishment request message according to the model type of the optical network unit; sending the wavelength channel establishment request message to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0069] On the other hand, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the wavelength channel recovery method based on the WDM-PON system provided by the above-mentioned embodiments, the method comprising: regularly sending an idle state broadcast message to each wavelength channel; after determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; based on the corresponding target wavelength channel in the wavelength channel connection establishment message, sending the wavelength channel connection establishment message to the target optical network unit to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit; Or, obtaining an idle state broadcast message periodically sent by the optical line terminal from each wavelength channel; if it is determined that the wavelength channel recovery connection process is currently to be performed, constructing a wavelength channel establishment request message according to the model type of the optical network unit; sending the wavelength channel establishment request message to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

[0070] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0071] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wavelength channel recovery method based on a WDM-PON system, characterized in that: Applied to optical line terminals, including: Send idle status broadcast messages to each wavelength channel at regular intervals; After determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; Based on the target wavelength channel corresponding to the wavelength channel connection establishment message, the wavelength channel connection establishment message is sent to the target optical network unit to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

2. The wavelength channel recovery method based on the WDM-PON system according to claim 1, characterized in that: The step of sending an idle state broadcast message to each wavelength channel at a fixed time includes: Determine whether each wavelength channel is currently in an idle state; According to the idle state judgment result, an idle state broadcast message is sent to each wavelength channel in the idle state at a fixed time.

3. The wavelength channel recovery method based on the WDM-PON system according to claim 1, characterized in that: After determining that a wavelength channel establishment request message sent by a target optical network unit is received, constructing a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit includes: Determining the model type of the target optical network unit according to the optical network unit type field in the wavelength channel establishment request message; When it is determined that the target optical network unit is an optical network unit having an ITU-T GPON component and a WDM component, it is determined whether the target optical network unit has registered an optical network unit ID, and if so, the wavelength channel connection establishment message is constructed according to the registered ID value; if not, a dynamic ID value is assigned to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value; When it is determined that the target optical network unit is an optical network unit having the WDM component but not the ITU-T GPON module, the dynamic ID value is allocated to the target optical network unit, and the wavelength channel connection establishment message is constructed according to the dynamic ID value.

4. The wavelength channel recovery method based on the WDM-PON system according to claim 1, characterized in that: The data field information in the idle state broadcast message, the wavelength channel establishment request message and the wavelength channel connection establishment message at least includes WDM channel number information, wavelength channel coding information, optical network unit model type information, wavelength channel state information and optical network unit ID information.

5. A wavelength channel recovery method based on a WDM-PON system, characterized in that: Applicable to optical network units, including: Obtaining idle state broadcast messages periodically sent by the optical line terminal from each wavelength channel; If it is determined that the wavelength channel recovery connection process is currently to be performed, a wavelength channel establishment request message is constructed according to the model type of the optical network unit; The wavelength channel establishment request message is sent to the optical line terminal to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

6. An optical line terminal, characterized in that: include: A first sending module, which sends idle state broadcast messages to each wavelength channel at a regular interval; A first message construction module is used to construct a corresponding wavelength channel connection establishment message according to the model type of the target optical network unit after determining that a wavelength channel establishment request message sent by the target optical network unit is received, wherein the target optical network unit is an optical network unit that has received the idle state broadcast message and whose wavelength channel connection is currently to be restored; A second sending module is used to send the wavelength channel connection establishment message to the target optical network unit based on the corresponding target wavelength channel in the wavelength channel connection establishment message, so as to establish a communication connection with the target optical network unit through the target wavelength channel, wherein the target wavelength channel is determined from multiple wavelength channels in an idle state when it is allowed to restore the wavelength channel connection for the target optical network unit.

7. An optical network unit, characterized in that: include: A message receiving module, used for acquiring idle state broadcast messages regularly sent by the optical line terminal from each wavelength channel; A second message construction module is used to construct a wavelength channel establishment request message according to the model type of the optical network unit if it is determined that the wavelength channel recovery connection process is currently to be performed; a third sending module, configured to send the wavelength channel establishment request message to the optical line terminal, so as to establish a communication connection with the optical line terminal through a target wavelength channel, wherein the target wavelength channel is determined from a plurality of wavelength channels in an idle state when the optical line terminal allows the wavelength channel connection to be restored for the target optical network unit.

8. A wavelength channel recovery device based on a WDM-PON system, characterized in that: It comprises the optical line terminal as claimed in claim 6, the optical network unit as claimed in claim 7, and an optical distribution network device arranged between the optical line terminal and the optical network unit.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the wavelength channel recovery method based on the WDM-PON system is implemented as claimed in any one of claims 1 to 5.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the wavelength channel restoration method based on the WDM-PON system is implemented as claimed in any one of claims 1 to 5.

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