WO2016141524A1 - Procédé de sélection de chemin, dispositif de commande de réseau optique et réseau de transmission optique - Google Patents

Procédé de sélection de chemin, dispositif de commande de réseau optique et réseau de transmission optique Download PDF

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Publication number
WO2016141524A1
WO2016141524A1 PCT/CN2015/073869 CN2015073869W WO2016141524A1 WO 2016141524 A1 WO2016141524 A1 WO 2016141524A1 CN 2015073869 W CN2015073869 W CN 2015073869W WO 2016141524 A1 WO2016141524 A1 WO 2016141524A1
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Prior art keywords
relay
otu
path
optical signal
node
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PCT/CN2015/073869
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English (en)
Chinese (zh)
Inventor
黄海平
余亮
饶宝全
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华为技术有限公司
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Priority to CN201580020735.3A priority Critical patent/CN106233680B/zh
Priority to PCT/CN2015/073869 priority patent/WO2016141524A1/fr
Publication of WO2016141524A1 publication Critical patent/WO2016141524A1/fr

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  • the present invention relates to the field of communications, and in particular, to a path selection method, an optical network controller, and an optical transmission network.
  • An optical transport network is a network that transmits information using light as a carrier, and includes a plurality of optical devices, such as an optical transform unit (OTU) and an optical line amplifier. For different services, the optical transport network can select different physical paths to transmit the service.
  • OTU optical transform unit
  • optical line amplifier For different services, the optical transport network can select different physical paths to transmit the service.
  • the optical signal of the physical path may pass through multiple optical devices and generate an optical signal noise ratio (OSNR).
  • OSNR optical signal noise ratio
  • the OSNR cost of the optical signal is continuously reduced. If the OSNR cost of the physical path is too large, the optical signal may not be correctly transmitted to the receiving end OTU. In this case, in order to ensure the normal transmission of the optical signal, the transmission may be performed.
  • a relay board is disposed in the relay node of the optical signal, and the relay board can be used to compensate the OSNR of the optical signal.
  • the prior art when selecting the physical path for transmitting the optical signal, only the optimization of the traffic engineering cost is considered, and the selected physical path may be too large due to the OSNR cost, so that the optical signal cannot be correctly transmitted.
  • the prior art The selected physical path may use too many relay boards, which adds additional relay cost.
  • the present invention provides a path selection method, an optical network controller, and an optical transmission network to solve the problem that the physical path of the optical signal transmitted in the prior art may not correctly transmit the optical signal, and may use too many relay boards.
  • a path selection method comprising:
  • any optical conversion unit OTU Take any optical conversion unit OTU as the source node, and any other OTU is the sink.
  • a node acquiring a physical path between the source node and the sink node;
  • the direct reachable path is that the relay OTU between the source node and the sink node does not use a relay board
  • the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the physical path of the preset OSNR threshold of the sink node;
  • the at least one relay OTU between the source node and the sink node uses a relay board, when the optical signal arrives from the source node to the sink node, the optical signal
  • the optical signal to noise ratio OSNR margin value is not less than the physical path of the preset OSNR threshold of the sink node;
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node
  • the sending end OTU is selected as the source node and The receiving end OTU sends the optical signal to the direct reachable path of the sink node; if the transmitting end OTU and the receiving end OTU do not exist, the transmitting end OTU is the source node and the receiving end OTU
  • the optical signal is selected by using the sending end OTU as a source node and the receiving end OTU as a sink node.
  • Optical signals including:
  • the relay reachable path with a small number of OTUs transmits the optical signal.
  • the selecting, the sending end OTU is a source node, and the receiving end OTU Sending the optical signal to the relay reachable path of the sink node, specifically:
  • the relay cost is a preset quantized value of the cost of the optical signal generated by the relay OTU using the relaying board.
  • the transmitting end OTU and the receiving The method further includes: a plurality of directly reachable paths between the end OTUs, where the sending end OTU is the source node, and the receiving end OTU is the sink node, the method further includes:
  • the direct reachable path with a small traffic engineering cost is selected to transmit the optical signal.
  • the determining, in the physical path, determining Direct reachable paths and relay reachable paths include:
  • said v represents a signal frequency of said optical signal
  • P in represents an input power value of said first amplifier passed by said optical signal on said physical path
  • N is said optical signal arriving on said physical path
  • F is a noise index accumulated when the optical signal reaches the sink node from the source node on the physical path
  • R out is the OSNR margin value.
  • h is the Planck constant and B o is the optical broadband value;
  • an optical network controller including:
  • An acquiring unit configured to use any one of the optical transformation unit OTUs as a source node, and any other one of the OTUs as a sink node, and obtain a physical path between the source node and the sink node;
  • a determining unit configured to determine a direct reachable path and a relay reachable path in the physical path acquired by the acquiring unit; the direct reachable path is a relay between the source node and the sink node
  • the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the preset OSNR gate of the sink node.
  • the relay reachable path is a case where the at least one relay OTU between the source node and the sink node uses a relay board, and the optical signal arrives from the source node
  • the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than a physical path of the preset OSNR threshold of the sink node
  • a path selecting unit configured to: when the transmitting end OTU and the receiving end OTU have a direct reachable path with the sending end OTU as a source node and the receiving end OTU as a sink node, selecting the sending end OTU Transmitting the optical signal to the source node and the direct reachable path of the sinking node by using the receiving end OTU; and the transmitting end OTU is not the source node of the sending end OTU and When the receiving end OTU is a direct reachable path of the sink node, the optical signal is selected by using the transmitting end OTU as a source node and the receiving end OTU as a sink node.
  • the path selecting unit is specifically configured to:
  • the transmitting end OTU is the source node and the receiving end OTU is the sinking node, and is used according to the relay reachable path.
  • the number of relay OTUs of the relay card is selected, and the relay reachable path with a small number of relay OTUs using the relay card with the transmitting end OTU as the source node and the receiving end OTU as the sink node is selected. Sending the optical signal.
  • the path selecting unit is specifically configured to:
  • the transmitting end OTU is the source node and the receiving end OTU is the sinking node, and is used according to the relay reachable path.
  • the number of the relay OTUs of the relay board, and the traffic engineering cost of the relay reachable path selecting the originating OTU as the source node and using the Transmitting, by the receiving end OTU, a sinking node, and transmitting, by the relay reachable path, a relay reachable path having a lower total cost of the traffic engineering cost, the relay cost being that the optical signal passes through the use relay
  • the path selection unit is further configured to:
  • the multiple lines may be directly In the path, the optical signal is sent by selecting a direct reachable path with a small traffic engineering cost.
  • the acquiring unit is further configured to:
  • the determining unit is specifically configured to:
  • said v represents a signal frequency of said optical signal
  • P in represents an input power value of said first amplifier passed by said optical signal on said physical path
  • N is said optical signal arriving on said physical path
  • F is a noise index accumulated when the optical signal reaches the sink node from the source node on the physical path
  • R out is the OSNR margin value.
  • h is the Planck constant and B o is the optical broadband value;
  • an optical network controller comprising: a bus, and a processor, a memory, an input module, and an output module connected to the bus; the memory is configured to store an instruction; the processor executes the instruction Used for:
  • any one of the optical transformation units OTU as a source node, and any other one of the OTUs is a sink node, and acquiring a physical path between the source node and the sink node;
  • the direct reachable path is that the relay OTU between the source node and the sink node does not use a relay board
  • the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the physical path of the preset OSNR threshold of the sink node;
  • the at least one relay OTU between the source node and the sink node uses a relay board, when the optical signal arrives from the source node to the sink node, the optical signal
  • the optical signal to noise ratio OSNR margin value is not less than the physical path of the preset OSNR threshold of the sink node;
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node
  • the sending end OTU is selected as the source node and The receiving end OTU sends the optical signal to the direct reachable path of the sink node; if the transmitting end OTU and the receiving end OTU do not exist, the transmitting end OTU is the source node and the receiving end OTU
  • the optical signal is selected by using the sending end OTU as a source node and the receiving end OTU as a sink node.
  • an optical transport network including multiple optical transform units (OTUs), and any one of the OTUs is connected to at least one of the other OTUs through a physical path, and the optical transport network further includes the second aspect to the second aspect.
  • An optical network controller according to any one of the four possible implementation manners, or the optical network controller according to the third aspect, wherein the optical network controller and the plurality of OTUs are respectively The transmitting end OTU, the receiving end OTU, and the at least one relay OTU are connected;
  • the transmitting end OTU is configured to convert the received electrical signal into an optical signal, and downlink the optical signal to the receiving end OTU through a physical path in the optical transmission network;
  • the receiving end OTU is configured to convert the received optical signal into an electrical signal, which is a node that outputs an electrical signal in the optical transmission network, and transmits an optical signal for response to the transmission through a physical path.
  • the relay OTU is configured to forward the optical signal or to regenerate the optical signal to recover an OSNR value of the optical signal, where the relay OTU needs to be in the optical signal regeneration
  • a relay board is placed in the trunk OTU.
  • any one optical transformation unit OTU is used as a source node, and any other OTU is a sink node, and a physical path between the source node and the sink node is obtained, and in the physical path, a direct reachable path is determined. Trunk reachable path; the OSNR cost of the direct reachable path and the relay reachable path can ensure the correct transmission of the optical signal. Therefore, select the direct reachable path without using the relay board, or choose to use the relay.
  • a relay-receiving path with fewer boards can transmit the optical signal, which not only ensures the correct transmission of the optical signal, but also reduces the number of used relay boards and reduces the cost of the relay.
  • 1 is a schematic structural diagram of a conventional optical transmission network
  • FIG. 2 is a schematic flowchart of a path selection method according to an embodiment of the present invention.
  • 3a is a schematic diagram of an optical accessibility map according to an embodiment of the present invention.
  • 3b is a schematic diagram of another optical accessibility map according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an optical network controller according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of another optical network controller according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of an optical transmission network according to an embodiment of the present invention.
  • FIG. 1 which includes a transmitting end OTU A, a receiving end OTU D, a relay OTU B and C, and amplifiers a, b, c, d.
  • the transmitting end OTU is a node that receives an electrical signal in the optical transmission network, and is configured to convert the received electrical signal into an optical signal, and downlink the optical signal to the receiving end OTU through a physical path in the optical transmission network;
  • a receiving end OTU for converting the received optical signal into an electrical signal, is a node that outputs an electrical signal in the optical transmission network, and transmits an optical signal for response to the transmitting end OTU through the physical path;
  • Relay OTU between the transmitting end OTU and the receiving end OTU, can be used to convert the illuminating signal, and can also be used to realize the regeneration of the optical signal to recover the OSNR value of the optical signal, wherein the relay OTU is used as the optical signal When regenerating, a relay board needs to be placed in the relay OTU.
  • Amplifier used to increase the power of an optical signal to compensate for the power loss caused by the transmission of an optical signal in a physical path.
  • An embodiment of the present invention provides a path selection method. As shown in FIG. 2, the method includes:
  • S201 Take any OTU as a source node, and use any other OTU as a sink node to obtain a physical path between the source node and the sink node.
  • the optical transmission network shown in FIG. 1 includes four OTUs of A, B, C, and D, wherein the physical path in the optical transmission network shown in FIG. 1 is explained below:
  • the physical paths are A-B, A-C, A-B-C, A-C-B, A-C-D, A-B-D, A-B-C-D, A-C-B-D;
  • the physical path is B-A, B-C, B-D, B-C-A, B-C-D;
  • the physical path is C-B, C-A, C-D, C-B-A, C-B-D;
  • the physical paths are D-B, D-C, D-B-C, D-C-B, D-C-A, D-B-A, D-B-C-A, and D-C-B-A.
  • the embodiment of the present invention may calculate the physical path by using Breadth First Search (abbreviated as BFS).
  • BFS Breadth First Search
  • the physical path in the optical transport network may also be calculated by using a K-shortest Path (KSP).
  • KSP K-shortest Path
  • the direct reachable path is a light signal of the optical signal when the optical signal arrives at the sink node from the source node if the relay OTU between the source node and the sink node does not use the relay board.
  • the signal-to-noise ratio OSNR margin value is not less than a physical path of the preset OSNR threshold value of the sink node; the relay reachable path is a relay singlet used by at least one relay OTU between the source node and the sink node In the case of a board, when the optical signal arrives at the sink node from the source node, the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the physical path of the preset OSNR threshold of the sink node.
  • the OSNR margin value when the source node arrives at the sink node v represents a signal frequency of the optical signal
  • P in represents an input power value of the first amplifier that the optical signal passes on the physical path
  • N is a time when the optical signal reaches the sink node on the physical path.
  • the number of amplifiers F is the noise figure accumulated when the optical signal reaches the sink node from the source node on the physical path
  • R out is the OSNR margin value
  • h is the Planck constant
  • B o is the optical broadband
  • the value determines the direct reachable path and the relay reachable path according to the preset OSNR threshold value of the sink node and the OSNR margin value of the optical signal on the physical path from the source node to the sink node.
  • the optical network controller may collect optical parameter information in the optical transmission network, and the optical parameter information may include an OSNR threshold of the sink node.
  • the physical path includes an amplifier a and an amplifier c between the source node A and the sink node D
  • P in the above formula is the input power of the amplifier a
  • v is the signal frequency of the optical signal to be transmitted, and the OSNR margin value of the optical signal when reaching the sink node D can be obtained by the above formula.
  • A is a source node
  • D is For example, for the physical path ABD, ACD, if the optical signal reaches the sink node D, the OSNR margin of the optical signal is not less than the preset OSNR threshold of the sink node D, then the ABD and the ACD are directly available.
  • the physical path ABCD, ACBD if the optical signal reaches the sink node D, the OSNR margin of the optical signal is smaller than the preset OSNR threshold of the sink node D, then the ABCD and the ACBD are indirectly reachable paths.
  • the indirect reachable path between the source node and the sink node it may be further determined whether the indirect reachable path is a relay reachable path according to the situation that the relay OTU on the indirect reachable path uses the relay board.
  • the direct reachable path between the source node A and the sink node C and the direct reachable path between the source node C and the sink node D can be determined by the above formula, if ABC As a direct reachable path, the CD is a direct reachable path and the C node uses a relay board.
  • the physical path ABCD is a relay reachable path between the source node A and the sink node D.
  • the optical accessibility map specifically indicates the usage of the relay board between any two nodes. Specifically, after determining the direct reachable path between any two nodes, all the nodes that have the direct reachable path are connected through the virtual link, and the obtained connection relationship diagram is called the optical accessibility map. . In the optical accessibility map, if there is a virtual link directly connected between the two nodes, it indicates that all the relay OTUs between the two nodes can not use the relay board; If there is no virtual link that is directly connected, and the virtual link connecting the two nodes passes through an intermediate node, the intermediate node must use the relay board.
  • the direct reachable path in the optical transport network shown in FIG. 1 includes: AB, BC, CD, ABC, BCD, ABCD, then A and B, B and C, A and C, B and D, respectively.
  • the optical accessibility map shown in Figure 3a can be obtained.
  • the Node B and the Node C may not use the relay board.
  • the direct reachable path in the optical transport network shown in FIG. 1 includes: AB, BC, CD, ABC, BCD, then A and B, B and C, A and C, B and D are respectively connected, and As shown in Figure 3b, in the optical accessibility map, there is no virtual link directly connected between node A and node D, and the virtual link ABD passes through the intermediate node B. Node B must use a trunk board.
  • the position and the number of the relay boards arranged in the optical transmission network can be effectively planned, the network construction cost is reduced, and when the optical signal is transmitted, the optical parameter can be displayed according to the reachable map.
  • the optical signal is selected to be transmitted using the least path of the relay board, which reduces the cost of the relay.
  • optical accessibility map is described in a graphical manner only for the convenience of understanding.
  • the optical accessibility map can be embodied in other forms, such as a computer programming language, which is not limited by the present invention. .
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node
  • the sending end OTU is selected as the source node and the receiving is performed.
  • the end OTU sends the optical signal to the direct reachable path of the sink node; if there is no direct reachable between the transmitting end OTU and the receiving end OTU, the transmitting end OTU is the source node and the receiving end OTU is the sink node.
  • the optical signal is selected by using the transmitting end OTU as a source node and the receiving end OTU as a sinking node.
  • the transmitting end OTU is the node A
  • the receiving end OTU is the node D
  • the physical path ABCD is the direct reachable path
  • the direct reachable path ABCD is preferentially selected to transmit the optical signal, and the direct reachable path is determined.
  • the OSNR cost of the directly reachable path can ensure the correct transmission of the optical signal
  • the relay OTU on the direct reachable path can not use the relay board. Therefore, the path of the selected optical signal is not only selected. The correct transmission of the optical signal is ensured, and at the same time, the relay board used is the least, which reduces the relay cost.
  • the optical signal is sent according to the method of the prior art, and the direct access path with less cost of the traffic engineering is selected, wherein the traffic engineering cost is relatively small according to the requirements in the actual application.
  • the reachable path may be a direct reachable path with the least cost of traffic engineering, which is not limited by the present invention.
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node.
  • the number of the relay OTUs using the relay card is the same as that of the receiving end OTU and the receiving end OTU is the sink node.
  • the lesser reachable path sends the optical signal, wherein the relay reachable path with a smaller number of relay OTUs using the relay card may be the middle of the relay board according to the requirements in the actual application.
  • the relay reachable path with the least number of OTUs is not limited by the present invention.
  • A is a source node
  • D is a sink node as an example.
  • the relay reachable path between node A and node D includes physical paths ABD and ABCD, where both node B and node C are arranged.
  • the optional relay board can send the optical signal using the least relay reachable path ABD.
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node.
  • the path is selected according to the number of the relay OTUs in the relay reachable path and the traffic engineering cost of the relay reachable path, and the OTU is selected as the source node and the receiving end OTU is used.
  • the optical signal is sent by the relay reachable path that is a sink node and has a lower total cost of the traffic engineering cost, and the relay cost is generated by the optical OTU through the relay OTU using the relay board.
  • the relay reachable path with a smaller total cost of the relay cost and the traffic engineering cost may be the least cost of the relay cost and the traffic engineering cost according to the requirements in the actual application.
  • the relay reachable path is not limited by the present invention.
  • the embodiment of the present invention can comprehensively consider the traffic engineering cost and the relay cost, wherein the relay cost can be manually preset, for example, manually preset any optical signal through each one.
  • the relay cost can be manually preset, for example, manually preset any optical signal through each one.
  • Relay using a relay board The relay cost of the OTU is 2000, the traffic engineering cost of the relay reachable path ACD is 5000, and the traffic engineering cost of the relay reachable path ABCD is 4000. According to the prior art scheme, if only the traffic engineering cost is considered, then the selection is made.
  • the path ABCD sends the optical signal, but considering the traffic engineering cost and the relay cost, the sum of the traffic engineering cost and the relay cost of the relay reachable path ACD is 7000, and the traffic engineering cost and relay of the relay reachable path ABCD The sum of the costs is 8000. Therefore, the embodiment of the present invention selects the path ACD to transmit the optical signal.
  • the OSNR cost of the direct reachable path and the relay reachable path determined in the physical path can ensure the correct transmission of the optical signal. Therefore, the direct reachable path of the relay board is not selected. Or, the optical signal is transmitted by using the relay reachable path with fewer relay boards, which not only ensures the correct transmission of the optical signal, but also reduces the number of used relay boards and reduces the relay cost.
  • the embodiment of the present invention provides an optical network controller 40, which corresponds to the foregoing method embodiment of FIG. 2, and each functional unit of the optical network controller 40 can be used in the foregoing method steps.
  • the optical network controller 40 includes:
  • the obtaining unit 41 is configured to use any one of the optical transformation units OTU as a source node, and any other one of the OTUs is a sink node, and obtain a physical path between the source node and the sink node.
  • the determining unit 42 is configured to determine a direct reachable path and a relay reachable path in the physical path acquired by the acquiring unit 41.
  • the direct reachable path is a light signal of the optical signal when the optical signal arrives at the sink node from the source node if the relay OTU between the source node and the sink node does not use the relay board.
  • the signal-to-noise ratio OSNR margin value is not less than a physical path of the preset OSNR threshold value of the sink node; the relay reachable path is a relay singlet used by at least one relay OTU between the source node and the sink node In the case of a board, when the optical signal arrives at the sink node from the source node, the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the physical path of the preset OSNR threshold of the sink node.
  • the path selecting unit 43 is configured to: when the transmitting end OTU is the source node and the receiving end OTU is the direct reachable path of the sink node between the transmitting end OTU and the receiving end OTU, selecting the transmitting end OTU as the source Node and the receiver OTU is the sink node straight Receiving the optical signal in the reachable path; when there is no direct reachable path between the transmitting end OTU and the receiving end OTU, the transmitting end OTU is the source node and the receiving end OTU is the sink node, The transmitting end OTU is the source node and the optical signal is sent by the relay reachable path of the receiving end OTU as the sink node.
  • the optical transmission network shown in FIG. 1 includes four OTUs of A, B, C, and D, wherein the physical path in the optical transmission network shown in FIG. 1 is explained below:
  • the physical paths are A-B, A-C, A-B-C, A-C-B, A-C-D, A-B-D, A-B-C-D, A-C-B-D;
  • the physical path is B-A, B-C, B-D, B-C-A, B-C-D;
  • the physical path is C-B, C-A, C-D, C-B-A, C-B-D;
  • the physical paths are D-B, D-C, D-B-C, D-C-B, D-C-A, D-B-A, D-B-C-A, and D-C-B-A.
  • the obtaining unit 41 is further configured to acquire a preset OSNR threshold value of the sink node on the physical path;
  • the input power value of the first amplifier passed over, N is the number of amplifiers that the optical signal passes when it reaches the sink node on the physical path, and F is the optical signal that arrives at the sink from the source node on the physical path.
  • the noise figure accumulated at the node R out is the OSNR margin value
  • h is the Planck constant
  • B o is the optical broadband value, according to the preset OSNR threshold value of the sink node and the optical signal in the physical path
  • the OSNR margin value when the source node arrives at the sink node determines the direct reachable path and the relay reachable path.
  • the physical path includes an amplifier a and an amplifier c between the source node A and the sink node D
  • P in the above formula is the input power of the amplifier a
  • v is the signal frequency of the optical signal to be transmitted, and the OSNR margin value of the optical signal when reaching the sink node D can be obtained by the above formula.
  • the size of the threshold value determines whether the physical path is a direct reachable path.
  • A is the source node
  • D is the sink node as an example.
  • ACD if the optical signal arrives at the sink node.
  • the OSNR margin of the optical signal is not less than the preset OSNR threshold of the sink node D, then the ABD and the ACD are directly reachable paths; and for the physical paths ABCD and ACBD, if the optical signal reaches the sink node D, If the OSNR margin of the optical signal is smaller than the preset OSNR threshold of the sink node D, the ABCD and the ACBD are indirectly reachable paths.
  • the indirect reachable path between the source node and the sink node it may be further determined whether the indirect reachable path is a relay reachable path according to the situation that the relay OTU on the indirect reachable path uses the relay board.
  • the direct reachable path between the source node A and the sink node C and the direct reachable path between the source node C and the sink node D can be determined by the above formula, if ABC As a direct reachable path, the CD is a direct reachable path and the C node uses a relay board.
  • the physical path ABCD is a relay reachable path between the source node A and the sink node D.
  • the transmitting end OTU is the node A
  • the receiving end OTU is the node D
  • the physical path ABCD is the direct reachable path
  • the direct reachable path ABCD is preferentially selected to transmit the optical signal, and the condition for determining the direct reachable path is determined. It can be seen that the OSNR cost of the direct reachable path can ensure the correct transmission of the optical signal, and the relay OTU on the direct reachable path can not use the relay board. Therefore, the selected path for transmitting the optical signal is not only guaranteed. The correct transmission of the optical signal, at the same time, the use of the least number of relay boards, reducing the cost of the relay.
  • the path selecting unit 43 is further configured to: if there is a plurality of direct reachable paths between the transmitting end OTU and the receiving end OTU, the transmitting end OTU is a source node and the receiving end OTU is a sink node.
  • the direct reachable path with less cost of the traffic engineering is selected to send the optical signal, wherein the direct reachable path with less cost of the traffic engineering may be according to requirements in actual applications. It is a direct reachable path with the lowest cost of the traffic engineering, which is not limited by the present invention.
  • the path selecting unit 43 is specifically configured to: if the transmitting end OTU and the receiving end OTU do not exist, the transmitting end OTU
  • the reachable path of the source node and the sink end OTU is the sink node, and according to the number of relay OTUs in the relay reachable path using the relay board, the OTU is selected as the source node and receives the same.
  • the end OTU sends the optical signal to the relay reachable path of the relay node that uses the relay card with a small number of relay OTUs.
  • the number of the relay OTUs using the relay board is required according to the requirements in the actual application.
  • the lesser reachable path may be the relay reachable path with the least number of relay OTUs using the relay board, which is not limited by the present invention.
  • A is a source node
  • D is a sink node as an example.
  • the relay reachable path between node A and node D includes physical paths ABD and ABCD, where both node B and node C are arranged.
  • the optional relay board can send the optical signal using the least relay reachable path ABD.
  • the path selecting unit 43 is specifically configured to: if the transmitting end OTU and the receiving end OTU do not exist with the transmitting end OTU as the source node, and receive the The end OTU is the reachable path of the sink node. According to the number of the relay OTUs in the relay reachable path and the traffic engineering cost of the relay reachable path, the OTU is selected as the source.
  • the optical signal is sent by the node and the relay end OTU is a sink node, and the relay cost and the total cost of the traffic engineering cost are small, and the relay cost is that the optical signal passes the use relay
  • the preset quantized value of the cost generated by the relay OTU of the board, wherein the relay reachable path with a smaller total cost of the relay cost and the traffic engineering cost may be the relay cost and the traffic according to the requirements in the actual application.
  • the relay reachable path with the smallest total cost of the engineering cost is not limited by the present invention.
  • the embodiment of the present invention can comprehensively consider the traffic engineering cost and the relay cost, wherein the relay cost can be manually preset, for example, manually preset any optical signal through each one.
  • the relay cost of the relay OTU using the relay board is 2000
  • the traffic engineering cost of the relay reachable path ACD is 5000
  • the traffic engineering cost of the relay reachable path ABCD is 4000
  • the path ABCD is selected to transmit the optical signal, but considering the traffic engineering cost and the relay cost, the relay reachable path ACD
  • the sum of the traffic engineering cost and the relay cost is 7000
  • the sum of the traffic engineering cost and the relay cost of the relay reachable path A-B-C-D is 8000. Therefore, the embodiment of the present invention selects the path A-C-D to transmit the optical signal.
  • the optical network controller uses the OSNR cost of the direct reachable path and the relay reachable path determined by the optical network controller in the physical path to ensure the correct transmission of the optical signal. Therefore, the optical network controller selects no Use the direct reachable path of the trunk card, or choose to use the relay reachable path with fewer relay boards to send optical signals, which not only ensures the correct transmission of the optical signal, but also reduces the number of used relay boards. , reducing the cost of the relay.
  • the embodiment of the present invention further provides an optical network controller 5, which is used to implement the path selection method provided by the embodiment of the present invention.
  • the optical network controller 5 includes:
  • bus 51 a bus 51, and a processor 52, a memory 53, an input module 54, and an output module 55 connected to the bus, wherein the processor 52, the memory 53, the input module 54, and the output module 55 pass the
  • the bus 51 completes communication with each other, and the input module 54 and the output module 55 are used to interact with external devices.
  • the processor 52 may be a multi-core central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • the memory 53 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the memory 53 can also be a memory array.
  • the memory 53 is for storing instructions that the processor 52 executes for:
  • any one of the optical transformation units OTU as a source node, and any other one of the OTUs is a sink node, and acquiring a physical path between the source node and the sink node;
  • the direct reachable path is that the relay OTU between the source node and the sink node does not use a relay board
  • the optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the physical path of the preset OSNR threshold of the sink node
  • the reachable path is at the source node and the sink node
  • an optical signal-to-noise ratio OSNR margin value of the optical signal is not less than the sink node.
  • the transmitting end OTU is the source node and the receiving end OTU is the sink node
  • the sending end OTU is selected as the source node and The receiving end OTU sends the optical signal to the direct reachable path of the sink node; if the transmitting end OTU and the receiving end OTU do not exist, the transmitting end OTU is the source node and the receiving end OTU
  • the optical signal is selected by using the sending end OTU as a source node and the receiving end OTU as a sink node.
  • processor 52 executes the instruction specifically for:
  • the transmitting end OTU is the source node and the receiving end OTU is the sinking node, and is used according to the relay reachable path.
  • the number of relay OTUs of the relay card is selected, and the relay reachable path with a small number of relay OTUs using the relay card with the transmitting end OTU as the source node and the receiving end OTU as the sink node is selected. Sending the optical signal.
  • processor 52 executes the instruction specifically for:
  • the transmitting end OTU is the source node and the receiving end OTU is the sinking node, and is used according to the relay reachable path.
  • the number of the relay OTUs of the relay board, and the traffic engineering cost of the relay reachable path selecting the originating OTU as the source node and the receiving end OTU as the sink node, and the relay cost And transmitting, by the relay reachable path, the total cost of the traffic engineering cost to the optical signal, where the relay cost is a preset quantization of a cost generated by the optical signal by using a relay OTU of the relay board value.
  • the processor 52 executes the instructions and is further configured to:
  • the plurality of direct reachable paths are configured by using the sending end OTU as a source node and the receiving end OTU as a sink node, In the path, the direct reachable path with less cost of traffic engineering is selected to transmit the optical signal.
  • processor 52 executes the instruction specifically for:
  • said v represents a signal frequency of said optical signal
  • P in represents an input power value of said first amplifier passed by said optical signal on said physical path
  • N is said optical signal arriving on said physical path
  • F is a noise index accumulated when the optical signal reaches the sink node from the source node on the physical path
  • R out is the OSNR margin value.
  • h is the Planck constant and B o is the optical broadband value;
  • the embodiment of the present invention provides an optical transmission network, where the optical transmission network includes multiple optical conversion units (OTUs), and any one of the OTUs is connected to at least one of the other OTUs through a physical path.
  • the optical transmission network includes a transmitting end.
  • the transmitting end OTU 61 is configured to convert the received electrical signal into an optical signal, and downlink the optical signal to the receiving end OTU 62 through a physical path in the optical transmitting network.
  • the receiving end OTU 62 is configured to convert the received optical signal into an electrical signal, which is a node that outputs an electrical signal in the optical transmission network, and uplinks an optical signal for response to the transmitting end OTU 61 through a physical path. .
  • the relay OTU 63 is configured to forward the optical signal or implement regeneration of the optical signal to recover an OSNR value of the optical signal, where the relay OTU needs to be in the relay OTU when used as an optical signal regeneration Arrange the relay board.
  • the optical network controller 64 is an optical network controller 40 as shown in FIG. 4, or as For details, refer to FIG. 4 or FIG. 5 for a detailed description of the corresponding embodiment of the optical network controller 50, and details are not described herein again.
  • the optical network controller acquires a physical path in the optical transport network, and determines a direct reachable path and a relay reachable path in the physical path, and the OSNR of the direct reachable path and the relay reachable path
  • the cost can ensure the correct transmission of the optical signal. Therefore, the optical network controller selects a direct reachable path that does not use the relay board, or selects a relay reachable path with fewer relay boards to transmit optical signals. Not only the correct transmission of the optical signal is ensured, but also the number of used relay boards is reduced, and the relay cost is reduced.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • each functional unit may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above units may be implemented in the form of hardware or in the form of hardware plus software functional units.
  • All or part of the steps of implementing the foregoing method embodiments may be performed by hardware related to the program instructions.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiments;
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic disk, or an optical disk, and the like, which can store program codes.

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  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Conformément à des modes de réalisation, la présente invention se rapporte au domaine des communications et concerne un procédé de sélection de chemin, un dispositif de commande de réseau optique et un réseau de transmission optique, pour traiter un problème dans l'état antérieur de la technique selon lequel un chemin physique émettant le signal optique ne peut pas émettre correctement le signal optique et utilise un nombre excessif de cartes de relais. Le procédé consiste : à prendre n'importe quelle unité de transport optique (OTU) comme nœud source et n'importe quelle autre OTU comme nœud de destination, à acquérir un chemin physique entre le nœud source et le nœud de destination; dans le chemin physique, à déterminer un chemin pouvant être atteint directement et un chemin pouvant être atteint au moyen d'un relais; s'il existe un chemin pouvant être atteint directement entre une OTU d'extrémité d'émission et une OTU d'extrémité de réception, l'OTU d'extrémité d'émission étant prise comme nœud source et l'OTU d'extrémité de réception étant prise comme nœud de destination, à sélectionner alors le chemin pouvant être atteint directement pour émettre le signal optique, autrement, à sélectionner le chemin pouvant être atteint au moyen d'un relais pour émettre le signal optique, l'OTU d'extrémité d'émission étant prise comme nœud source et l'OTU d'extrémité de réception étant prise comme nœud de destination. Les modes de réalisation de la présente invention sont utilisés pour sélectionner un chemin du signal optique.
PCT/CN2015/073869 2015-03-09 2015-03-09 Procédé de sélection de chemin, dispositif de commande de réseau optique et réseau de transmission optique WO2016141524A1 (fr)

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PCT/CN2015/073869 WO2016141524A1 (fr) 2015-03-09 2015-03-09 Procédé de sélection de chemin, dispositif de commande de réseau optique et réseau de transmission optique

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