CN113891480A - Power distribution network multi-service safety bearing system based on TWDM-PON - Google Patents
Power distribution network multi-service safety bearing system based on TWDM-PON Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
- H04J14/0239—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths in WDM-PON sharing multiple downstream wavelengths for groups of optical network units [ONU], e.g. multicasting wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract
The invention relates to a TWDM-PON-based power distribution network multi-service safety bearing system and a bandwidth allocation method for the system, wherein the system comprises station end equipment OLT and terminal equipment ONU; the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting power distribution terminal information to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network; the terminal equipment ONU is arranged on the power distribution terminal equipment, and the terminal equipment ONU is in communication connection with the station end equipment OLT through the ODN communication network so as to upload the information of each terminal equipment to the station end equipment OLT. The technical scheme provided by the invention realizes that the EPON product is used in the intelligent power distribution network and meets the safety bearing requirement that one set of equipment bears multiple service transmissions; and the TWDM-PON technology is directly used in a power distribution network communication network.
Description
Technical Field
The invention relates to the technical field of power distribution network communication, in particular to a TWDM-PON-based power distribution network multi-service safety bearing system.
Background
With the rapid development of the intelligent power distribution network, optical fiber communication technologies represented by EPONs and ethernet switches are widely applied in the field of intelligent power distribution network communication. Because both the EPON technology and the ethernet switching technology are intended to solve the problem of IP data transmission, their development is also based on the requirement of multi-service transmission of operators, and are inconsistent with the aspects of safety, reliability and real-time guarantee of power service transmission at the starting point, especially, power service is limited by power safety protection regulations, and the services of the production control large area and the management information large area need to be transmitted in a physical isolation manner, which requires that the distribution network service and the power consumption information acquisition service are separated during planning, and two sets of optical communication products (EPON, ethernet switches) are simultaneously adopted on the same optical cable to respectively transmit the services of the production control large area and the management information large area, thereby doubling the investment and the number of devices, and also doubling the operation and maintenance costs. The investment cost is a considerable problem in the scale of thousands of equipment in a city in a power distribution network.
The TWDM-PON adopts a mixed mode of time division multiplexing and wavelength division multiplexing, a plurality of time division PON channels on the same ODN network are multiplexed through a wavelength stacking technology, the speed, the capacity, the reliability and the safety of the system are improved, the existing PON technology and ODN network resources are utilized to the maximum extent, and the smooth upgrading of the network is realized. The ONU transmission capacity can reach 10G, and the ONU is suitable for large-capacity, high-speed and multi-service transmission. However, the price is high, the communication use requirement of the power distribution network is not completely met, and the communication requirement of the power distribution network needs to be designed and modified so as to meet the requirement of multi-service safety bearing in the power distribution network.
Disclosure of Invention
Based on the above situation in the prior art, an object of the present invention is to provide a power distribution network multi-service secure bearer system based on a TWDM-PON, which realizes direct use of a TWDM-PON technology in a power distribution network communication network.
In order to achieve the above object, according to an aspect of the present invention, there is provided a power distribution network multi-service secure bearer system based on a TWDM-PON, including a station-side device OLT and a terminal device ONU;
the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting the information of the power transformation and distribution terminal to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network;
the terminal equipment ONU is arranged on the power distribution terminal equipment, and the terminal equipment ONU is in communication connection with the station end equipment OLT through the ODN communication network so as to upload the information of each terminal equipment to the station end equipment OLT.
Further, the station end device OLT transmits data to each of the terminal devices ONU in a broadcast manner in a downlink direction.
Further, the station end equipment OLT multiplexes multiple paths of optical signals into one path of optical signal through the arrayed waveguide grating through a multiplexer and demultiplexer, and accesses the ODN communication network;
and demultiplexing the optical signals through light splitting to recover the original optical signals, and distributing the original optical signals to each terminal equipment ONU.
Furthermore, each of the terminal equipments ONU performs data communication in the uplink direction by combining wavelength division multiplexing and time division multiplexing.
Further, each terminal device ONU divides each wavelength into different time slots to carry different services according to the unified scheduling of the station-side device OLT, and shares the uplink bandwidth by time division multiplexing.
Furthermore, each of the terminal devices ONU performs data communication, and at least four pairs of optical waves of the TWDM-PON are used to carry different service data.
Further, the different service data includes distribution automation data, power quality monitoring data, power consumption information acquisition data and distributed energy data.
According to another aspect of the present invention, there is provided a bandwidth allocation method for the power distribution network multi-service safety bearer system according to the first aspect of the present invention, comprising the steps of:
s1, each terminal device ONU reports bandwidth request to OLT by using in-band overhead;
s2, station side equipment OLT based on available bandwidth resources, terminal equipment ONU up and down bandwidth requirements and user service level protocol, according to terminal equipment ONU type, providing wavelength allocation, and arranging length and start time of up and down transmission window for each terminal equipment ONU;
s3, the station end equipment OLT sends downlink service data and bandwidth authorization according to the distribution result;
s4, each terminal ONU obtains the result of upstream bandwidth allocation from the authorized bandwidth, and sends upstream traffic in a predetermined timeslot window.
Further, the terminal equipment ONUiThe minimum guaranteed bandwidth of (d) is:
wherein: n represents the total number of the terminal equipment ONU; i represents the ith terminal equipment ONU; k represents the number of wavelength pairs; rNRepresenting the transmission rate of the network; t iscycleRepresents a maximum grant period; t isgIndicating guard slots between transmission windows; wiRepresents a weight, and
further, the terminal equipment ONUiThe authorized bandwidth is:
wherein the content of the first and second substances,
for the ith terminal equipment ONUiThe requested bandwidth of (2).
In summary, the present invention provides a distribution network multi-service secure bearer system based on a TWDM-PON and a bandwidth allocation method for the system, where the system includes a station-side device OLT and a terminal device ONU; the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting power distribution terminal information to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network; the terminal equipment ONU is arranged on the power distribution terminal equipment, and the terminal equipment ONU is in communication connection with the station end equipment OLT through the ODN communication network so as to upload the information of each terminal equipment to the station end equipment OLT. The technical scheme provided by the invention realizes that the EPON product is used in the intelligent power distribution network and meets the safety bearing requirement that one set of equipment bears multiple service transmissions; and the TWDM-PON technology is directly used in a power distribution network communication network.
Drawings
Fig. 1 is a schematic overall architecture diagram of a distribution network multi-service security bearer system based on a TWDM-PON according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a network architecture for communication between a station end device OLT and a terminal device OUN in a distribution network multi-service secure bearer system based on a TWDM-PON according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the allocation of wavelengths in an optical convergence access network.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Technical terms related to the present invention are explained below.
Passive Optical Network (PON): the passive optical network PON is a point-to-multipoint optical fiber transmission and access technology, a broadcast mode is adopted in the downlink, a time division multiple access mode is adopted in the uplink, tree-shaped, star-shaped, bus-shaped and other topological structures can be flexibly formed, only a simple optical splitter needs to be installed at an optical branch point, and therefore the passive optical network PON has the advantages of saving optical cable resources, sharing bandwidth resources, saving machine room investment, being high in network building speed, being low in comprehensive network building cost and the like, and is widely applied to power distribution networks.
Ethernet Passive Optical Network (EPON) is: ethernet passive optical network EPON is a PON technology based on ethernet, which provides various services over ethernet using a point-to-multipoint structure, passive optical fiber transmission. EPON technology is standardized by the IEEE802.3 EFM working group. In the standard, ethernet and PON technologies are combined, a PON technology is adopted in a physical layer, an ethernet protocol is used in a data link layer, and ethernet access is realized by using a topology structure of a PON.
Based on Time and Wavelength Division multiplexing (Time and Wavelength Division multiplexing-Passive Optical Network, hereinafter referred to as "TWDM-PON"): PON technology based on time division and wavelength division multiplexing provides four or more wavelengths per fiber, each of which can provide 2.5Gbps or 10Gbps symmetric or asymmetric rate transmission capabilities. The TWDM technology can realize higher bandwidth (the total bandwidth is up to 40Gbps, and each user can realize up to 10Gbps), and also can provide optimal flexibility for bandwidth adjustment of each user, management of optical fibers, fusion of services, resource sharing and the like, and is a main technology choice for next-generation optical fiber access NG-PON2 in the communication industry.
Colorless Optical Network Unit (Optical Network Unit, hereinafter referred to as "colorless ONU"): different from the fixed wavelength ONU, the TWDM-PON colorless ONU is simple because the wavelength in the ONU does not need to be managed, and each ONU in the system can be the same, so that the installation and maintenance are very convenient, and the operation and maintenance cost can be reduced. The emission wavelength of a colorless ONU is non-specific and is determined by external factors such as the filtering property of an Arrayed Waveguide Grating (AWG) of a remote node or the wavelength of the injected light and the seed light of the ONU, and the colorless ONU is classified into: colorless ONUs based on spectral partitioning techniques; an external injection locking and colorless ONU with seed wavelength; self-injection locked Fabry-Perot laser (FP-LD) and colorless ONU from seed optical Reflection Semiconductor Optical Amplifier (RSOA).
Electric power business partition: the electric power secondary system is divided into a production control area and a management information area according to the principles of safe partition, network exclusive use, transverse isolation and longitudinal authentication. The production control large area is divided into a control area (a safety area I) and a non-control area (a safety area II). The information management large area is divided into a production management area (safety area III) and a management information area (safety area IV). Different safety zones determine different safety protection requirements, wherein the safety grade of the safety zone I is highest, the safety zone II is next, and the rest are analogized in sequence.
Electric TWDM-PON: the TWDM-PON equipment is adopted in the electric power intelligent power distribution network to transmit power distribution automation service, power utilization information acquisition information and other services in different subareas, the reliable transmission of the power distribution network multi-service under the safety isolation is realized by using a physical isolation method of TWDM-PON with different wavelengths, and the electric power intelligent power distribution network has the characteristics of high safety, high reliability, higher real-time performance and the like.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, there is provided a distribution network multi-service secure bearer system based on a TWDM-PON, where an overall architecture diagram of the system is shown in fig. 1, and the system includes a station-side device OLT and a terminal device ONU;
the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting the information of the power transformation and distribution terminal to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network;
the plurality of terminal equipment ONUs are arranged on the power distribution terminal equipment, and the plurality of terminal equipment ONUs are in communication connection with the station end equipment OLT through the ODN communication network so as to upload information of each terminal equipment to the station end equipment OLT. According to the service characteristics of the power distribution network, the terminal equipment ONU can be divided into three types:
a terminal device ONU (provided with double PON ports, 4 FE ports and 2 RS-485/232 ports) for a production control area;
a terminal device ONU for management information large area (configured with a single PON port, 4 FE ports, and 2 RS-485/232 ports);
a fiber-to-the-home terminal equipment ONU (configured with a single PON port, 4 FE ports, 2 POS and 1 CATV). The three types of terminal equipment ONU respectively adopt different uplink and downlink wavelengths.
The system of the embodiment of the invention adopts a technical architecture based on the combination of exchange and storage resources, wherein a station end device OLT and a terminal device OUN respectively use an independent communication interface, a separated exchange unit and a storage unit for different services to realize the equivalent physical isolation of service data in the process of electric domain signal processing; the communication between the station end equipment OLT and the terminal equipment OUN is isolated by adopting a wavelength division multiplexing scheme, so that the effect of equivalent physical isolation in an optical fiber transmission channel is achieved; the combination of the two can realize high isolation, namely physical isolation, of different security large area services in the access communication of the whole TWDM-PON.
Fig. 2 is a schematic diagram of a network architecture for communication between a station end device OLT and a terminal device OUN in a distribution network multi-service secure bearer system based on a TWDM-PON according to an embodiment of the present invention, where the following communication methods are adopted:
the method comprises the following steps that station end equipment OLT transmits data to each terminal equipment ONU in a broadcasting mode in a downlink direction; the station end equipment OLT multiplexes multiple paths of optical signals into one path of optical signal through the array waveguide grating through a multiplexer and demultiplexer, and accesses the ODN communication network; and demultiplexing the optical signals through light splitting to restore the optical signals into original optical signals, and distributing the original optical signals to each terminal equipment ONU. Each terminal equipment ONU carries out data communication in the uplink direction by adopting the combination of wavelength division multiplexing and time division multiplexing. Each terminal device ONU divides each wavelength into different time slots to bear different services according to the unified scheduling of the station end device OLT, and shares the uplink bandwidth through time division multiplexing. Each terminal device ONU carries out data communication and adopts at least four pairs of light waves of TWDM-PON to carry different service data. The different service data comprises distribution automation data, electric energy quality monitoring data, electricity utilization information acquisition data and distributed energy data. For example, the most basic 4 pairs of optical waves of the TWDM-PON can be used to respectively carry uplink and downlink services and terminal device ONU control information, all wavelengths of the TWDM-PON fall within the C-band, the wavelength interval conforms to the 50GHz grid specified by the ITU-T standard, there is a 6nm guard interval between the uplink and downlink wavelengths, and the downlink and uplink wavelengths belong to the blue and red bands. The most basic 4 pairs of light waves of the TWDM-PON are lambda u1, …, lambda u4, lambda d1, … and lambda d 4. The C wave band range is 1530nm-1565 nm. And adopting centralized bandwidth allocation, uniformly allocating wavelength and time slot resources by the OLT, and controlling the ONU of the terminal equipment to execute allocation results. A schematic diagram of the allocation of wavelengths in an optical convergence access network is shown in fig. 3. When it is needed to carry more service data, more optical wave pairs may also be used, which is not specifically limited herein.
In the system provided by the embodiment of the invention, the power multi-service resources of distribution network automation, power utilization information acquisition and fiber-to-the-home service are integrated and transmitted, and the effective safe isolation and reliable transmission of the multi-service in the system are realized by utilizing the distribution of a plurality of optical wavelengths.
According to another embodiment of the present invention, there is provided a bandwidth allocation method for a power distribution network multi-service secure bearer system according to the first embodiment of the present invention, including the following steps:
s1, each terminal device ONU reports bandwidth request to OLT by using in-band overhead;
s2, station side equipment OLT based on available bandwidth resources, terminal equipment ONU up and down bandwidth requirements and user service level protocol, according to terminal equipment ONU type, providing wavelength allocation, and arranging length and start time of up and down transmission window for each terminal equipment ONU;
s3, the station end equipment OLT sends downlink service data and bandwidth authorization according to the distribution result;
s4, each terminal ONU obtains the result of upstream bandwidth allocation from the authorized bandwidth, and sends upstream traffic in a predetermined timeslot window.
Terminal equipment ONUiThe minimum guaranteed bandwidth of (d) is:
wherein: n represents the total number of the terminal equipment ONU; i represents the ith terminal equipment ONU; k represents the number of wavelength pairs; rNRepresenting the transmission rate of the network; t iscycleRepresents a maximum grant period; t isgIndicating guard slots between transmission windows; wiRepresents a weight, and
terminal equipment ONUiThe authorized bandwidth is:
wherein the content of the first and second substances,
for the ith terminal equipment ONUiRequested bandwidth of
In the bandwidth allocation method according to this embodiment of the present invention, centralized bandwidth allocation is adopted in the designed electric TWDM-PON scheme, wavelength and timeslot resources are allocated uniformly by the station end device OLT, and the terminal device ONU is controlled to execute the allocation result. Because the terminal equipment ONU adopts the mode of fixedly allocating the wavelength, the dynamic bandwidth allocation (DWBA) algorithm is also greatly simplified, when the station end equipment OLT receives the REPORT messages of all the terminal equipment ONU, the resource allocation mechanism starts to operate, the bandwidth allocation of the terminal equipment ONU adopts a fixed allocation period, and the bandwidth request of the terminal equipment ONU can not exceed the maximum bandwidth threshold of budget.
In summary, the present invention relates to a distribution network multi-service secure bearer system based on a TWDM-PON and a bandwidth allocation method for the system, where the system includes a station end device OLT and a terminal device ONU; the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting power distribution terminal information to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network; the terminal equipment ONU is arranged on the power distribution terminal equipment, and the terminal equipment ONU is in communication connection with the station end equipment OLT through the ODN communication network so as to upload the information of each terminal equipment to the station end equipment OLT. The technical scheme provided by the invention realizes that the EPON product is used in the intelligent power distribution network and meets the safety bearing requirement that one set of equipment bears multiple service transmissions; and the TWDM-PON technology is directly used in a power distribution network communication network.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A power distribution network multi-service safety bearing system based on TWDM-PON is characterized by comprising station end equipment OLT and terminal equipment ONU;
the station end equipment OLT is arranged in the power distribution main station, the uplink is used for transmitting the information of the power transformation and distribution terminal to the power distribution main station, and the downlink is in communication connection with the terminal equipment ONU through the ODN communication network;
the terminal equipment ONU is arranged on the power distribution terminal equipment, and the terminal equipment ONU is in communication connection with the station end equipment OLT through the ODN communication network so as to upload the information of each terminal equipment to the station end equipment OLT.
2. The system of claim 1, wherein the station side equipment OLT transmits data in a downstream direction to each of the end equipment ONUs in a broadcast manner.
3. The method according to claim 2, wherein the station-side equipment OLT multiplexes multiple optical signals into one optical signal through an arrayed waveguide grating by using a multiplexer and demultiplexer, and accesses the ODN communication network;
and demultiplexing the optical signals through light splitting to recover the original optical signals, and distributing the original optical signals to each terminal equipment ONU.
4. The method according to claim 1, wherein each of the terminal equipments ONU performs data communication in an upstream direction by using a combination of wavelength division multiplexing and time division multiplexing.
5. The method of claim 4, wherein each of the end devices ONU divides each wavelength into different time slots to carry different services according to a unified scheduling of the end device OLT, and shares an upstream bandwidth by time division multiplexing.
6. The method according to claim 5, wherein each of said end devices ONU is in data communication using at least four pairs of optical waves of a TWDM-PON for carrying different traffic data.
7. The method of claim 6, wherein the different business data comprises distribution automation data, power quality monitoring data, electricity usage information collection data, and distributed energy data.
8. A bandwidth allocation method for the multi-service safety bearer system of the power distribution network according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, each terminal device ONU reports bandwidth request to OLT by using in-band overhead;
s2, station side equipment OLT based on available bandwidth resources, terminal equipment ONU up and down bandwidth requirements and user service level protocol, according to terminal equipment ONU type, providing wavelength allocation, and arranging length and start time of up and down transmission window for each terminal equipment ONU;
s3, the station end equipment OLT sends downlink service data and bandwidth authorization according to the distribution result;
s4, each terminal ONU obtains the result of upstream bandwidth allocation from the authorized bandwidth, and sends upstream traffic in a predetermined timeslot window.
9. The method according to claim 8, characterized in that the end device ONUiThe minimum guaranteed bandwidth of (d) is:
wherein: n represents the total number of the terminal equipment ONU; i represents the ith terminal equipment ONU; k represents the number of wavelength pairs; rNRepresenting the transmission rate of the network; t iscycleRepresents a maximum grant period; t isgIndicating guard slots between transmission windows; wiRepresents a weight, and
10. the method according to claim 9, characterized in that the end device ONUiThe authorized bandwidth is:
wherein the content of the first and second substances,
for the ith terminal equipment ONUiThe requested bandwidth of (2).
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| CN116781159A (en) * | 2023-06-25 | 2023-09-19 | 江西省通信产业服务有限公司上饶分公司 | Intelligent machine room optical fiber service confirmation method, system and storage medium |
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| CN116781159A (en) * | 2023-06-25 | 2023-09-19 | 江西省通信产业服务有限公司上饶分公司 | Intelligent machine room optical fiber service confirmation method, system and storage medium |
| CN116781159B (en) * | 2023-06-25 | 2024-04-26 | 江西省通信产业服务有限公司上饶分公司 | Intelligent machine room optical fiber service confirmation method, system and storage medium |
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