CN104780471B - A kind of all optical networks fringe node light packet data framing method - Google Patents

Abstract

The present invention provides an optical packet data framing method for an edge node of an electric power all-optical switching network oriented to different transmission requirements of power services in terms of delay, real-time performance, and reliability, including: (1) constructing a multi-queue based on a composite threshold Parallel framing array; (2) The merging unit of the substation and the intelligent terminal input the Ethernet data packet of the service message to the edge node; (3) Judging whether the business type of the Ethernet data packet input to the edge node meets real-time performance Requirements; (4) Map the Ethernet data packet to the framing queue for framing; (5) The framing queue sends the assembled data frame to the sending queue of the edge node, and uploads it to the all-optical switching network through the output unit transmission. The invention adopts a multi-queue composite threshold parallel framing mechanism for data framing, realizes the power service access of the all-optical switching network, and improves the utilization rate of the all-optical switching network while ensuring real-time transmission of key services.

Description

A method for framing optical packet data at the edge node of an all-optical switching network

technical field

The invention relates to a framing method in the technical field of intelligent communication in a power system, in particular to a method for framing optical packet data at an edge node of an all-optical switching network.

Background technique

With the construction of the smart grid, the requirements for communication functions in the power system are becoming more and more stringent. Since the environment of the power system is generally harsh, reliable data communication methods are required. The all-optical switching network can avoid multiple optical-to-electrical conversions on each node of the communication network, so that the communication network is no longer subject to the "electronic bottleneck" caused by the defects of bandwidth and power consumption of the electronic device itself, which greatly improves the Communication network bandwidth and real-time performance reduce the power consumption of network equipment. At the same time, the all-optical switching technology has a natural anti-electromagnetic interference capability, and can be reliably applied to the field of power communication where the electromagnetic environment is harsh. Optical grouping and framing of power service data by the edge nodes of the all-optical switching network is an important link for power service access to the all-optical network transmission.

In an all-optical packet-switching network, in view of the suddenness and high reliability requirements of power service data, it is necessary to aggregate and assemble power service data into different packets. Under the assembly mechanism based on the optical packet length threshold, the packet is sent to the switching network only when the packet reaches a certain number, and the packet length is fixed, which may cause a large delay for some data packets; The mechanism and algorithm are generated at fixed intervals and periodically sent to the optical network, which may cause packets to be sent before they are full, resulting in low utilization of network resources or data congestion.

Contents of the invention

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method for framing optical packet data at the edge node of an all-optical switching network. Different types of power services set composite thresholds of different times and lengths, and use a multi-queue composite threshold parallel framing mechanism for data framing to realize power service access to the all-optical switching network, while ensuring real-time transmission of key services, and improving Utilization of all-optical switching network.

The object of the present invention is to adopt following technical scheme to realize:

The present invention provides a method for framing optical packet data at an edge node of an all-optical switching network. The improvement is that the method includes the following steps:

(1) Construct a multi-queue parallel framing array based on composite threshold;

(2) The merging unit and the intelligent terminal of the substation input the Ethernet data packet of the service message to the edge node;

(3) Judging whether the business type of the Ethernet data packet input to the edge node meets the real-time requirement;

(4) Ethernet packets are mapped to the framing queue for framing;

(5) The framing queue sends the assembled data frame to the sending queue of the edge node, and uploads it to the all-optical switching network through the output unit for transmission.

Further, in the step (1), the framing array is composed of multiple framing queues, and the waiting time threshold T and length threshold L of each framing queue are set according to the real-time level of the queue and the business type to be mapped ;(Set different time-based and length-based composite thresholds for different types of power services. For high real-time services, set a smaller waiting time threshold and data length threshold, and set a relatively long waiting time threshold for low real-time services and data length threshold) for the high real-time SV message service in the electric power service is set according to the instant forwarding strategy, T=0s, L=0bit; for the GOOSE message service required by the medium real-time setting T=13μs, T=1518bit; for the low real-time The MMS message service setting T=100μs, L=7590bit.

Further, in the step (3), the service type includes high real-time service, medium real-time service and low real-time service; after the edge node receives the service message, it analyzes the type field of the service message, and judges the type of the message ;Service messages include: SV messages, GOOSE messages and MMS messages; among them, SV messages have the highest real-time requirements and are high real-time services; GOOSE messages have lower real-time requirements than SV messages and are medium real-time services; MMS messages have the lowest real-time requirements and are low-real-time services.

Further, in the step (4), the Ethernet data packet is mapped to different framing queues for framing according to the priority and real-time requirements of the business, and the SV message service enters the highest real-time queue for framing, and the GOOSE business and MMS enter the queues with T and L values that meet their respective business needs for framing; each framing queue is independently framed and processed in parallel, and the business data framing is completed according to the set framing strategy.

Further, said step (4) includes the following steps:

A. The SV message enters the framing queue 1 with the highest real-time performance, GOOSE enters the framing queue 2, and the MMS enters the framing queue n with low real-time requirements;

B. In the framing queue 1, set the data framing strategy to wait time T0=0, and perform framing to ensure the high real-time performance of the SV business; in the framing queue 2, set the data framing strategy to wait for the message After the time reaches the maximum threshold T2 or the length of the data packets waiting in queue 2 reaches the maximum length threshold L2, the framing is performed; in the framing queue n, set the data framing strategy as the message waiting time reaches the maximum threshold Tn or queue n waits After the data packet length reaches the maximum length threshold Ln, framing is performed;

C. The framing queue 2 to the framing queue n are from high to low according to real-time requirements, the set waiting time threshold T2 to Tn gradually becomes longer, and the data length threshold L2 to Ln gradually increases; the specific waiting time threshold T and data The length threshold L can be reasonably set according to the real-time requirements of the specific power service and the characteristics of the packet length. Set the high real-time SV service in the power service according to the real-time forwarding strategy, that is, T=0s, L=0bit; set T=13μs, T=1518bit for the GOOSE service required by the medium real-time service; set T=100μs for the low real-time MMS service , L=7590bit.

Further, in the step (5), after the edge node data is framed, it is connected to the all-optical switching network, uploaded to the all-optical network via the output unit and transmitted to the network connected with the measurement and control device, fault recorder, protection device and security device. edge node, and then perform downlink deframing and transmit to the corresponding device.

Compared with the closest prior art, the excellent effect that the technical solution provided by the present invention has is:

1. The present invention uses a composite threshold-based frame assembly mechanism to solve the problem of real-time, reliable, and efficient access to power all-optical networks for transmission of power services with different priorities.

2. The present invention provides an optical packet framing technology based on the composite threshold of time and length for power service flow changes and real-time requirements, and sets diversified framing strategies to group different types of services through different framing queues. Frame, realize optical packet optimization framing in complex business environment, meet business real-time requirements, and improve system resource utilization.

Description of drawings

Fig. 1 is a schematic diagram of data framing based on time and length composite thresholds provided by the present invention;

Fig. 2 is a schematic diagram of an all-optical communication network of a smart substation provided by the present invention;

Fig. 3 is a flow chart of framing at the edge node of the electric power all-optical switching network provided by the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The invention provides a method for framing optical packet data of edge nodes in an electric power all-optical switching network, setting composite thresholds of different times and lengths for different types of electric power services, and adopting a multi-queue composite threshold parallel framing mechanism for data grouping frame, realize the power service access of the all-optical switching network, and improve the utilization rate of the all-optical switching network while ensuring the real-time transmission of key services.

The framing flowchart of the edge node of the electric power all-optical switching network provided by the present invention is shown in Figure 3, including the following steps:

(1) Construct a multi-queue parallel framing array based on composite threshold. The framing array is composed of multiple framing queues, and the waiting time threshold T and length threshold L of each framing queue are reasonably set according to the real-time level of the queue and the type of business that needs to be mapped. Each framing queue is independently framed and processed in parallel, and completes the corresponding business data framing according to the set framing strategy. Set different composite thresholds based on time and length for different types of power services. For high real-time services, set a smaller waiting time threshold and data length threshold, and set relatively longer waiting time thresholds and data length thresholds for low real-time services. Set the high real-time SV service in the power service according to the real-time forwarding strategy, that is, T=0s, L=0bit; set T=13μs, T=1518bit for the GOOSE service required by the medium real-time service; set T=100μs for the low real-time MMS service , L=7590bit.

(2) The merging unit and the intelligent terminal of the substation input the Ethernet data packet of the service message to the edge node;

The merging unit and intelligent terminal of the substation send the business message to the edge node, and the edge node performs data framing and then accesses the all-optical switching network, and transmits the message through the all-optical network to the network connected with measurement and control devices, fault recorders, protection devices, and security The edge node of the device and other equipment, and then perform downlink deframing and transmit it to the corresponding equipment.

(3) Judging the business type and real-time requirements of the Ethernet data packet input to the edge node;

After receiving the service message, the edge node parses the type field of the service message, judges the type of the message, and performs real-time requirement mapping. In the all-optical communication network of the smart substation, as shown in Figure 2, the business types include high real-time business, medium real-time business and low real-time business; after the edge node receives the business message, it parses the type field of the business message and performs judge. Typical service messages include: SV messages, GOOSE messages and MMS messages; among them, SV messages have the highest real-time requirements and are high real-time services; GOOSE messages have lower real-time requirements than SV messages and are medium real-time services ; MMS messages have the lowest real-time requirements, and are low-real-time services.

(4) Multi-queue composite threshold parallel framing mechanism based on business classification: according to the priority and real-time requirements of the business, the data packets are mapped to different framing queues for framing. The SV service enters the highest real-time queue for framing, and the GOOSE service and MMS enters the T and L queues that meet their respective service requirements for framing. Include the following steps:

A. The SV message enters the framing queue 1 with the highest real-time performance, GOOSE enters the framing queue 2, and the MMS enters the framing queue n with low real-time requirements;

B. In the framing queue 1, set the data framing strategy to wait time T0=0, and perform framing to ensure the high real-time performance of the SV business; in the framing queue 2, set the data framing strategy to wait for the message After the time reaches the maximum threshold T2 or the length of the data packets waiting in queue 2 reaches the maximum length threshold L2, the framing is performed; in the framing queue n, set the data framing strategy as the message waiting time reaches the maximum threshold Tn or queue n waits After the data packet length reaches the maximum length threshold Ln, framing is performed;

(5) C, framing queue 2 to framing queue n from high to low according to real-time requirements, the set waiting time threshold T2 to Tn gradually becomes longer, and the data length threshold L2 to Ln gradually increases; the specific waiting time threshold T and the data length threshold L can be reasonably set according to the real-time requirements and packet length characteristics of specific power services. Set the high real-time SV service in the power service according to the real-time forwarding strategy, that is, T=0s, L=0bit; set T=13μs, T=1518bit for the GOOSE service required by the medium real-time service; set T=100μs for the low real-time MMS service , L=7590bit. The framing queue sends the assembled data frame to the sending queue of the edge node, uploads it to the all-optical switching network through the output unit and transmits it to the edge node connected with the measurement and control device, fault recorder, protection device and security device, and then performs Deframe the downlink and send it to the corresponding device.

Example

Taking the edge node framing process of the smart substation communication network as an example, the framing process is introduced in detail, as shown in Figure 3.

After the service message is input to the edge node, the service type is judged first, and different services are mapped to different framing queues. The SV message enters the framing queue 1 with the highest real-time performance, GOOSE enters the framing queue 2, and the MMS enters the framing queue n with low real-time requirements. In framing queue 1, set the data framing strategy to wait time T1 = 0, that is, frame immediately to ensure high real-time performance of SV services; in framing queue 2, set the data framing strategy to message waiting time After the maximum threshold T2 is reached or the length of the data packets waiting in queue 2 reaches the maximum length threshold L2, framing is performed; in the framing queue n, set the data framing strategy as the message waiting time reaches the maximum threshold Tn or the data waiting in queue n After the packet length reaches the maximum length threshold Ln, framing is performed. Queue 2 to queue n go from high to low according to real-time requirements, the set time thresholds T2 to Tn gradually become longer, and the data length thresholds L2 to Ln also gradually increase. The specific time threshold T and data length threshold L can be reasonably set according to the real-time requirements and packet length characteristics of specific power services.

The framing queue sends the assembled data frame to the sending queue of the edge node, and uploads it to the all-optical switching network through the output unit for transmission.

The optical packet data framing method of the present invention is described in detail by taking the all-optical communication network of the intelligent substation as an example in the implementation plan, but it is not limited to the framing of the edge nodes of the all-optical communication network of the intelligent substation, and there are many other methods in the field of power system communication technology Similar applications, such as services such as power distribution, load control, and power consumption information collection for intelligent power distribution and consumption, can also use the mechanism of the present invention.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still implement the present invention Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention is within the protection scope of the claims of the pending application of the present invention.

Claims (4)

1. a kind of all optical networks fringe node light packet data framing method, which is characterized in that the method includes following Step：

(1) more queue in parallel group frame array based on compound thresholding are constructed；

(2) Ethernet data bag of service message is input to fringe node by the combining unit of substation and intelligent terminal；

(3) judgement is input to the type of service of the Ethernet data bag of fringe node and whether meets requirement of real-time；

(4) Ethernet data bag is mapped to group frame queue and carries out framing；

(5) assembled data framing is sent to the transmit queue of fringe node by group frame queue, is uploaded to entirely through output unit Optical switching network is transmitted；

In the step (1), group frame array is made of multiple framing queues, the waiting time thresholding T and length of each group frame queue Thresholding L is configured according to the type of service that the real-time grade and needs of this queue map；To high real-time in power business SV message traffic is arranged by instant forwarding strategy, T=0s, L=0bit；T=is arranged in the GOOSE message business of centering requirement of real time 13 μ s, T=1518bit；T=100 μ s, L=7590bit are arranged to low real-time MMS message traffic；

In the step (3), type of service includes high real time business, middle real time business and low real time business；Fringe node receives To after service message, the type field of service message is parsed, the type of message is judged；Service message includes：SV message, GOOSE message and MMS message；The wherein requirement of real-time highest of SV message is high real time business；GOOSE message real-time is wanted It asks lower than SV message, is middle real time business；The requirement of MMS message real-time performance is minimum, is low real time business.

2. fringe node light packet data framing method as described in claim 1, which is characterized in that in the step (4), root Ethernet data bag is mapped to different group frame queues according to the priority and requirement of real-time of business and carries out framing, SV message industry Business enters highest real-time queue and carries out framing, GOOSE business and MMS enter the queue of the T and L value for meeting respective business demand into Row framing；Each group of frame queue independence framing, parallel processing, by the framing strategy finishing service data framing set.

3. fringe node light packet data framing method as described in claim 1, which is characterized in that the step (4) includes Following step：

A, SV message enters highest group of frame queue 1 of real-time, and GOOSE enters group frame queue 2, and it is low that MMS enters requirement of real-time Group frame queue n；

B, in group frame queue 1, setting data framing strategy is waiting time T0=0, framing is carried out, to guarantee the height of SV business Real-time；In group frame queue 2, setting data framing strategy is to reach max threshold T2 or the waiting of queue 2 the message waiting time Data packet length reach maximum length thresholding L2 after, carry out framing；In group frame queue n, setting data framing strategy is report After the data packet length that the literary waiting time reaches max threshold Tn or queue n waiting reaches maximum length thresholding Ln, framing is carried out；

C, group frame queue 2 to group frame queue n according to requirement of real-time from high to low, set waiting time thresholding T2 to Tn by Gradual change is long, and data length thresholding L2 to Ln is gradually increased；Specific waiting time thresholding T and data length threshold L can be according to tool The requirement of real-time and message length characteristic of the power business of body are reasonably set；To SV industry in real time high in power business Business is configured by instant forwarding strategy, i.e. T=0s, L=0bit；T=13 μ s, T is arranged in the GOOSE business of centering requirement of real time =1518bit；T=100 μ s, L=7590bit are arranged to low real-time MMS business.

4. fringe node light packet data framing method as described in claim 1, which is characterized in that in the step (5), by Fringe node data framing is followed by into all optical networks, is uploaded to all-optical network via output unit and is transferred to and is connected with survey Control device, failure wave-recording, protective device and stability control equipment fringe node, then carry out downlink frame decoding, be transmitted to relevant device.