CN110430486B - Boundary switching node based on integrated hybrid optical switching network - Google Patents
Boundary switching node based on integrated hybrid optical switching network Download PDFInfo
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- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H—ELECTRICITY
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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Abstract
The invention discloses a boundary switching node based on an integrated mixed optical switching network, which comprises: the service identification module is used for identifying the type of data service arriving at the network and sending data to the corresponding transmission submodule according to the service type; the switching transmission module comprises an optical cross-connection transmission submodule OXC, an optical packet switching transmission submodule OPS and an electric packet switching transmission submodule EPS; and the output multiplexing module comprises a control circuit, a delay line, a coupler and a multiplexer, and the optical packet switching transmission submodule and the electrical packet switching transmission submodule are subjected to add-drop multiplexing to the idle part of the optical cross-connect transmission submodule. The switching node combines the advantages of Optical Circuit Switching (OCS), optical packet switching and electric packet switching, and achieves the purpose that different service types share wavelength resources on the basis of ensuring the service QoS requirement, thereby achieving the maximization of network resource utilization and the optimization of service QoS support.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a boundary switching node based on an integrated hybrid optical switching network.
Background
With the dual motivation of internet big data and optical communication network development, people continuously put new demands on the development of communication networks. Since the increase of IP traffic is extremely rapid and it is urgent to increase the capacity of backbone networks, Dense Wavelength Division Multiplexing (DWDM) has come to be in force. Dense wavelength division multiplexing can enable transmission bandwidth to reach the transmission level of single optical fiber 50Tbps, and solves the problem of insufficient transmission bandwidth, but the requirement of network nodes on information processing efficiency is continuously improved, so that information is transmitted in an optical mode, and conversion in an electrical mode is the mainstream mode of the existing photoelectric network. The inherent properties of the electronic devices, such as bandwidth limitation and local power consumption, affect the transmission and exchange of information, which becomes a major bottleneck in the development of the current optical-electrical network. In order to improve the phenomenon and better exert the advantages of optical technology, optical switching devices such as optical cross connection, optical branching multiplexing and the like are fully utilized at nodes to make up the defect of unmatched switching and transmission.
For an optical network system, low energy consumption, high openness and strong operability are the main characteristics of the optical switching technology. There are many mature Optical Switching technologies, including Optical Circuit Switching (OCS) and Electronic Packet Switching (EPS). Optical wavelength switching can solely share network resources, data service types with high bandwidth requirements are transmitted, and low packet loss rate and low delay are also main advantages of the optical wavelength switching, but the utilization rate of the network resources is not high. The data packets are processed one by one through the electric packet switching, the error rate is reduced, the reliability of data transmission is improved, any scheduling mode is utilized, but the photoelectric conversion needs to be completed, and the process energy consumption is large. Hybrid switching networks have been developed in order to better exploit the advantages of these switching technologies and reduce their adverse impact on the network architecture.
The invention patent application with publication number CN105141512A discloses a unified network architecture and control method for supporting packet/circuit hybrid switching networks, wherein a centralized network controller is arranged in a multi-domain heterogeneous network composed of a plurality of packet switching networks and circuit switching networks, to perform route calculation, resource scheduling and flow control of the whole network, and to accommodate customization of different network control and management rules through external interfaces; the centralized network controller is connected with each router of the packet switching network, acquires neighbor topology information and traffic engineering database information of the router, is used for performing routing calculation, resource scheduling and flow control, and issues routing calculation results and control management information to the router to complete routing table configuration and router control and management; regarding each circuit switching network as a virtual router, setting a virtual router proxy as an entity of the virtual router, connecting the centralized network controller with each virtual router proxy, acquiring internal and external abstract topology information and traffic engineering database information of the circuit switching network corresponding to the centralized network controller through the virtual router proxies, sending a virtual routing table and control management information to each circuit switching network edge node through each virtual router proxy by the centralized network controller, and triggering connection control and network management of the circuit switching network.
However, the existing hybrid switching network only includes the cross-switching module and the electrical packet switching module, and the resource utilization rate is low. Therefore, how to realize resource sharing of different services and improve resource utilization rate is an urgent problem to be solved in the field.
Disclosure of Invention
The present invention aims to overcome the defects of the prior art and provides a boundary switching node based on an integrated hybrid optical switching network. In consideration of the requirements of continuous upgrading of network equipment and economic cost saving, the invention adds the optical packet switching sub-module on the basis of the existing optical cross-switching module and the electric packet switching module. The purpose of sharing wavelength resources by different service types is realized, the bandwidth is better and effectively distributed, the network resources are shared, the transmission structure of the node is optimized to realize better utilization of the network resources and higher QoS, and the cost of the overall switch system structure is obviously reduced. The integrated hybrid optical network boundary switching node accords with the development direction of future network optimization, can better explore the potential of an optical network, and provides higher-quality information service.
In order to achieve the purpose, the invention adopts the following technical scheme:
a border switching node based on an integrated hybrid optical switching network, comprising:
the service identification module is used for identifying the type of data service arriving at the network and sending data to the corresponding transmission submodule according to the service type;
the switching transmission module comprises an optical cross-connection transmission submodule OXC, an optical packet switching transmission submodule OPS and an electric packet switching transmission submodule EPS;
and the output multiplexing module comprises a control circuit, a delay line, a coupler and a multiplexer, and the optical packet switching transmission submodule and the electrical packet switching transmission submodule are subjected to add-drop multiplexing to the idle part of the optical cross-connect transmission submodule.
Further, the service types include GST- "circuit service", SM/RT- "real-time service", and SM/BE- "packet service"; the optical cross connection transmission sub-module is used for transmitting GST service classes; the optical packet switching transmission sub-module is used for transmitting SM/RT service classes; the electric packet switching transmission sub-module is used for transmitting SM/BE service classes.
Further, the integrated hybrid optical switch network includes ingress or egress optical fibers, traffic upload and traffic download ports; the ingress or egress optical fiber is used to transmit background traffic from or to other nodes of the network; the service upload and download ports are used to change the local traffic flowing into or out of the border switching node of the integrated hybrid optical switching network.
Furthermore, the service identification module comprises a logic control circuit, an FDL delay line, a demultiplexer, an optical splitter, an electrical splitter, a high-speed optical switch and a low-speed optical switch.
Further, the switching transmission module comprises a control switching circuit, a high-low speed optical switch array, an electronic packet switch and an electric buffer.
Furthermore, the optical splitter separates a small part of power, the power enters the logic control circuit to complete the conversion of the photoelectric signal and the reading of the signal information, and the switching control is performed according to the signal information obtained by decoding.
Further, the optical cross-connect transmission sub-module is a low-speed optical switch matrix, the optical packet switch transmission sub-module is a high-speed optical switch matrix, and the electrical packet switch transmission sub-module is an electronic packet switch.
Further, for background traffic, packets belonging to GST or SM/RT services will be sent directly to OXC or OPS; the SM/BE data packet will pass through the input buffer before being sent to the EPS; for local traffic, if incoming packets belong to GST, they will be buffered and encapsulated into GST bursts and then sent to OXC; if the arriving data packets belong to SM/RT, they will be sent to the limited size input buffer; arriving packets belonging to the SM/BE service will BE sent to an input buffer shared with the SM/BE background traffic.
Further, different applications of different service classes have different priorities; two queues for video and data sources of GST services, for buffering and assembling incoming packets into GST bursts for each wavelength; for the SM/RT service class, two packet sources of voice and control messages are generated; for the SM/BE service class, two sources are defined: video and data, two large enough queues for both source types from background traffic and local traffic, the video queue is high priority.
Furthermore, the output end of the low-speed optical switch matrix is connected to a coupler through a delay line, the coupler respectively multiplexes the same wavelength resources of different services correspondingly transmitted by the cross-connection transmission sub-module OXC, the optical packet switching transmission sub-module OPS and the electrical packet switching transmission sub-module EPS, and the multiplexer multiplexes and outputs different wavelength signals output by the coupler.
The boundary switching node based on the hybrid integrated hybrid optical switching network integrates the advantages of Optical Circuit Switching (OCS), Optical Packet Switching (OPS) and Electronic Packet Switching (EPS), and transmits three service levels on the same wavelength resource. The architecture applies an electronic buffer and a plurality of queues to map incoming traffic to three service classes. The detailed implementation of a queue scheduling technology, an assembly algorithm and a contention resolution mechanism is provided, and a network architecture is better adjusted; the design of the boundary switching node of the integrated hybrid optical switching network improves the network capacity, and realizes better resource utilization rate and higher QoS. Furthermore, it significantly reduces the cost of the overall switch architecture by mapping the largest amount of services to the GST and SM/BE service classes, both of which are handled by relatively sophisticated switches.
Drawings
Fig. 1 is a schematic diagram of an integrated hybrid optical switching network boundary switching node according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a service identification module according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example one
As shown in fig. 1, the present embodiment provides a border switching node based on an integrated hybrid optical switching network, including:
and the service identification module 2 is used for identifying the type of the data service arriving at the network and sending the data to the corresponding transmission submodule according to the service type.
The integrated mixed optical switching network boundary switching node is generally directly connected with a terminal, is positioned at the edge part of a network, meets the requirement of the edge network environment and is positioned at the important position of a network architecture. Directly connected to the designed input of the border switching node of the integrated hybrid optical switching network is a traffic identification module. The module mainly comprises a high-speed optical switch and an electric processing device, and plays a role in identifying the service transmission type.
The service identification module is composed of a switch control circuit, an FDL delay line, a demultiplexer, an optical splitter, an electric splitter, a high-speed optical switch and a low-speed optical switch. The exchange transmission module mainly comprises a control exchange circuit, a high-low speed optical switch array, an electronic packet exchanger and an electric buffer.
As shown in fig. 2, the service identification module is composed of an optical splitter 11, an FDL12, a logic control circuit 13, an electrical splitter 14, a low-speed optical switch 15, a high-speed optical switch 16, and a high-speed optical switch 17. The signal isolator can replace the function of an electric splitter, a logic control circuit mainly needs technical support such as photoelectric conversion, FPGA and the like, and an optical function beam splitter generally adopts a Y-branch waveguide structure beam splitter based on total internal reflection by using an organic polymer material PMMA.
The working principle of the service identification module is that each wavelength output by the demultiplexer enters a logic control circuit part through a small part of power separated by the optical beam splitter, photoelectric signal conversion is performed at the moment, information analysis is mainly completed through the logic control circuit, if analyzed data is a GST packaged data packet, low-speed optical switch 15 is closed, and high-speed optical switch 16 and high-speed optical switch 17 are opened; if the data packet is SM/RT packaged, the high-speed light switch 16 is closed, and the low-speed light switch 15 and the high-speed light switch 17 are opened; if the data packet is SM/BE encapsulated data packet, the high speed light switch 17 is closed, and the low speed light switch 15 and the high speed light switch 16 are opened.
The Switching transmission module includes an Optical cross-connect (4, OXC) transmission sub-module, an Optical Packet Switching (OPS) transmission sub-module 5, and an Electrical Packet Switching (EPS) transmission sub-module 6, where the Optical cross-connect transmission sub-module 4 is used for performing transmission Switching on Optical circuit Switching services, the Optical Packet Switching transmission sub-module 5 is used for performing Switching transmission on Optical Packet Switching services, and the electrical Packet Switching transmission sub-module 6 is used for performing Switching transmission on electrical Packet Switching services.
The service types mainly transmitted by the switching module include GST- "circuit service", SM/RT- "real-time service" and SM/BE- "packet service". The optical cross-connection transmission submodule 4 transmits optical GST service classes; the optical packet switching transmission sub-module 5 transmits optical SM/RT service classes; the electrical packet-switched transmission submodule 6 transmits the optical SM/BE service class. The optical cross-connect transmission sub-module mainly transmits optical wavelength switching services, the optical packet switching transmission sub-module mainly transmits optical packet switching services, and the electrical packet switching transmission sub-module mainly transmits electrical packet switching services. The invention mainly comprises three transmission service types of GST, SM/RT and SM/BE. If the optical GST service class is the optical GST service class, the optical GST service class is transmitted to the OXC submodule for exchange transmission; if the service class is the optical SM/RT service class, transmitting the service class to an OPS sub-module; if the service class is the optical SM/BE service class, the service class is transmitted to the EPS submodule.
The invention is based on a boundary switching node of an integrated hybrid optical switching network, integrates optical cross connection, optical packet switching, electric packet switching and other switching sub-modules, aims to meet various terminal service requirements, classifies the services transmitted by the switch, shares network resources according to a time interleaving mode, improves the channel utilization rate, saves network energy consumption, integrates the advantages of different switching modes, and adjusts the network to support different quality of service (QoS) requirements.
The invention adds optical packet switching on the basis of the existing optical network on the optical cross connection and the electrical packet switching. The three switching sub-modules of optical cross connection, optical packet switching and electric packet switching are mixed. The terminal service is divided into three different transmission types, and the optical cross connection transmission has high requirements on time delay and reliability; the optical packet switching transmits the service type sensitive to the time delay; the electric packet switching transmission is of a service type with low real-time requirement. The present invention is different from the design of boundary switching node of general integrated mixed optical switching network in that it utilizes three switching modes of optical cross-connection switching, optical packet switching and electronic packet switching to make two kinds of transmission data of optical packet switching and electronic packet switching be multiplexed into transmission idle part in optical cross-connection service. The method solves the problem of low utilization rate caused by that the channel only transmits one data type, and greatly improves the multiplexing capability of the transmission line.
The invention mainly adopts two optical switch matrixes with different rates, wherein the low-speed optical switch matrix is used for optical wavelength switching, and the high-speed optical switch matrix is used for optical packet switching. The electronic packet switch sub-module 6 is an electronic packet switch.
The immature optical random access equipment enables the high-speed optical switch to configure the electric buffer as the cache equipment, so that the packet loss rate caused by competition is reduced; the invention adds an optical fiber delay line FDL at each OXC output port, which plays a role of reducing the interruption rate when transmitting data packets, the length of each section of optical fiber delay line is set to be the same as the maximum length of a single data packet, and the extra delay can ensure the minimum packet loss rate of the data packet being transmitted; the invention is equipped with wavelength converter at the input and output of the optical packet switch, and switches the data packet service to any wavelength of any port according to the network protocol and requirement of the upper layer. The invention multiplexes the data packet to the idle light path at the output end of the optical switch, thereby improving the utilization rate of the network and reducing the waste of network resources.
The invention not only completes the background business of exchange transmission, but also uploads and downloads the local business. The integrated hybrid optical switched network border switching node thus allows optical access supporting wavelength routing networks and electrical access of IP data packets to be accessed together. The switching network consists of ingress or egress optical fibers and traffic upload and traffic download ports. The ingress or egress optical fibers are used to transport background traffic from or to other nodes of the network. The traffic upload and download ports are used to change the local traffic flowing into or out of the designed network of integrated hybrid optical switched network border switching nodes.
For background traffic, the packet type is detected by the traffic identification module. Packets belonging to GST or SM/RT services will be sent directly to OXC or OPS. The SM/BE data packet will pass through the input buffer before being sent to the EPS; for local traffic, arriving packets are mapped to different service classes and added to the network through a summing port and multiple input buffers. If incoming packets belong to GST, they will be buffered and encapsulated into GST bursts, which are then sent to the OXC. If the arriving packets belong to the SM/RT, they will be sent to a limited size input buffer to reduce potential packet loss. The size of the buffers depends on their delay tolerance. Arriving packets belonging to the SM/BE service will BE sent to an input buffer shared with the SM/BE background traffic. Because the real-time requirement is low, the size of the buffer area is set to be large enough to ensure that the overflow of the buffer area can not cause packet loss. Therefore, the packet loss rate of the data packet is reduced as much as possible on the basis of maximizing the utilization of wavelength resources.
The present invention assigns the highest priority to GST bursts for any wavelength in the appropriate output fiber, which can be forwarded without loss all the time. When a new GST burst arrives, the detection signal from the OXC will inform the OPS and EPS to stop sending new SM/RT and SM/BE packets on the wavelength. To ensure that the currently transmitted SM/RT packet completes transmission at this wavelength, the GST burst must pass through a fixed fiber delay line FDL before being sent. The length of the FDL1 is set according to the maximum SM/RT packet size. Therefore, FDL guarantees that non-prioritized scheduling of GST is better than SM/RT services. However, the SM/RT packet size is much smaller than the typical SM/BE packet size. The SM/BE packet being transmitted may BE interrupted by a GST burst if the FDL is less than its remaining transmission time. Therefore, the GST service has priority over the SM/BE service. The present invention uses the detection signal to ensure that the SM/RT service takes precedence over the SM/BE service. When a new SM/RT packet arrives and there is no free wavelength available in the appropriate output fiber, the detection signal from the OPS will inform the EPS to stop sending new SM/BE packets on the selected wavelength. At the same time, the SM/BE packets transmitted on that wavelength are interrupted and lost. Thus, the SM/BE packet is guaranteed to have the lowest priority and can BE interrupted by GST burst and SM/RT packet, and the SM/BE service does not influence the performance of GST or SM/RT service; the SM/RT service cannot affect the performance of the GST service.
The present invention specifies different priorities for different applications of different service classes. For GST service classes, there is no contention between background traffic and local traffic. We define two queues for video and data sources for GST services. Two queues are used to buffer and assemble the incoming packets into GST bursts per wavelength, giving priority to video queues with relatively high QoS requirements. For the SM/RT service class, two packet sources are considered that generate voice and control messages. Voice has a higher real-time requirement, while control messages are more sensitive to packet loss. A two-stage static priority scheduling technique is used, with background traffic being considered first. In each traffic type, voice packets are prioritized. Each output fibre has two buffers of limited size for local traffic, their size depending on their delay tolerance. For the SM/BE service class, covering low real-time demand applications, we define two sources: video and data, both of which are assumed to be used by low quality demand applications. Video has relatively higher QoS requirements than data. Two large enough queues are used for both source types from background traffic and local traffic, with the video queue being prioritized.
The output multiplexing module comprises a control circuit 10, an FDL delay line 9, a coupler 7 and a multiplexer 8, and is used for multiplexing optical packet connection and electronic packet switching add/drop to an idle part of optical cross connection transmission.
The output multiplexing module realizes the functions of different transmission types and sharing network resources. The multiplexer and the demultiplexer in the design of the boundary switching node of the integrated hybrid optical switching network can be completed by using a thin film filtering and circulating technology; the high-speed optical switch is realized by using an LiNbO3 optical switch; the low-speed optical switch is realized by using an MEMS optical switch; the optical coupler is packaged by adopting an SMD (surface mounted device); a random access memory may replace the electrical buffer.
Therefore, the design of the boundary switching node of the integrated hybrid optical switching network combines the advantages of the OXC, OPS and EPS switching transmission sub-modules, three service classes are transmitted on the same wavelength resource, the utilization rate of the network resource is improved, and higher QoS is obtained. In addition, it significantly reduces the cost of the overall switch architecture by mapping service types to GST, SM/RT and SM/BE, providing an economically feasible network architecture, speeding up the pace of information exchange transmission.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A border switching node based on an integrated hybrid optical switching network, comprising:
the service identification module is used for identifying the type of data service arriving at the network and sending data to the corresponding transmission submodule according to the service type;
the switching transmission module comprises an optical cross-connection transmission submodule OXC, an optical packet switching transmission submodule OPS and an electric packet switching transmission submodule EPS;
the output multiplexing module comprises a control circuit, a delay line, a coupler and a multiplexer, and is used for performing add-drop multiplexing on the optical packet switching transmission submodule and the electrical packet switching transmission submodule to an idle part of the optical cross-connect transmission submodule;
the service types include GST- "circuit service", SM/RT- "real-time service" and SM/BE- "packet service"; the optical cross connection transmission sub-module is used for transmitting GST service classes; the optical packet switching transmission sub-module is used for transmitting SM/RT service classes; the electric packet switching transmission sub-module is used for transmitting SM/BE service classes.
2. The edge switching node of claim 1 wherein the integrated hybrid optical switching network includes ingress or egress optical fibers, traffic upload and traffic download ports; the ingress or egress optical fiber is used to transmit background traffic from or to other nodes of the network; the service upload and download ports are used to change the local traffic flowing into or out of the border switching node of the integrated hybrid optical switching network.
3. The edge switching node of claim 1 wherein the traffic identification module comprises logic control circuitry, FDL delay lines, demultiplexers, optical splitters, electrical splitters, and high speed optical switches and low speed optical switches.
4. The edge switching node of claim 1 wherein the switch transport module comprises a control switch circuit, an array of high and low speed optical switches, an electronic packet switch, and an electrical buffer.
5. The edge switching node of claim 3, wherein the optical splitter splits a small portion of power to enter the logic control circuit to perform the conversion of the optical signal and the reading of the signal information, and performs the switching control according to the signal information obtained by decoding.
6. The edge switching node of claim 1 wherein the optical cross-connect transport submodule is a low-speed optical switch matrix, the optical packet switch transport submodule is a high-speed optical switch matrix, and the electrical packet switch transport submodule is an electronic packet switch.
7. A border switching node according to claim 2, characterized in that for background traffic, data packets belonging to GST or SM/RT services will be sent directly to OXC or OPS; the SM/BE data packet will pass through the input buffer before being sent to the EPS;
for local traffic, if incoming packets belong to GST, they will be buffered and encapsulated into GST bursts and then sent to OXC; if the arriving data packets belong to SM/RT, they will be sent to the limited size input buffer; arriving packets belonging to the SM/BE service will BE sent to an input buffer shared with the SM/BE background traffic.
8. The edge switching node of claim 7 wherein different applications of different service classes have different priorities; two queues for video and data sources of GST services, for buffering and assembling incoming packets into GST bursts for each wavelength; for the SM/RT service class, two packet sources of voice and control messages are generated; for the SM/BE service class, two sources are defined: video and data, two large enough queues for both source types from background traffic and local traffic, the video queue is high priority.
9. The edge switching node of claim 6, wherein the output end of the low-speed optical switch matrix is connected to a coupler through a delay line, the coupler respectively multiplexes the same wavelength resources of different services correspondingly transmitted by the optical cross-connect transmission sub-module OXC, the optical packet switch transmission sub-module OPS, and the electrical packet switch transmission sub-module EPS, and the multiplexer multiplexes and outputs signals with different wavelengths output by the coupler.
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