CN114629857B - Method, device and system for reserving bandwidth resources in satellite network - Google Patents

Abstract

The application provides a bandwidth resource reservation method, device and system in a satellite network, wherein the method comprises the following steps: determining a target path of the target service in the satellite network according to the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model and the preset available bandwidth resource data corresponding to each link; and transmitting the target path to an entry node of the satellite network in the form of a segmented routing SR label stack, so that the entry node receiving the data packet of the target service limits the speed of the data packet according to the bandwidth reserved for the target service and forwards the data packet in the satellite network preferentially. The method and the system can reserve resources and guarantee the service quality for the service with the resource reservation requirement in the whole network range of the satellite network, and can reserve resources and independently maintain the high-priority service or the service with the resource reservation requirement while frequently carrying out resource reservation configuration is not needed.

Description

Bandwidth resource reservation method, device and system in satellite network

Technical field

The present application relates to the field of satellite network technology, and in particular to methods, devices and systems for bandwidth resource reservation in satellite networks.

Background technique

Satellite networks often use QoS (Quality of Service) to ensure the service capabilities of network communications to the network. Among the three main service models currently provided by QoS, Differentiated service (differentiated service model, Diff-Serv for short) provides better services. Diff-Serv is a class-based QoS technology that mainly includes traffic classification and marking, congestion management and congestion avoidance, traffic policing and other technologies. At the edge of the network, the network device inspects the contents of the traffic packets entering the network. By classifying and marking the packets, the packets are divided into different and limited behavior sets, and each set has a unique DS code point identifier. In the core network, different forwarding strategies are adopted for each packet based on the identifier to provide differentiated services for data packets. Differentiated services do not need to save flow status and signaling information, and have good scalability, but it is difficult to provide service guarantees for flow-based end-to-end quality.

Currently, the existing Diff-Serv service model divides different business requests into a limited number of business categories. By aggregating business flows with the same characteristics, it provides services for the overall aggregation flow, rather than for a single business. Flows no longer maintain the forwarding status of each application flow or each user, so it is difficult to provide quality assurance for specific business flows, and it is impossible to achieve strict resource reservation and service quality assurance.

Therefore, it is urgent to design a way to provide strict resource reservation for services that require resource reservation under the Diff-Serv differentiated service model that processes all business flows by class or priority.

Contents of the invention

In view of this, embodiments of the present application provide methods, devices, and systems for bandwidth resource reservation in satellite networks to eliminate or improve one or more defects existing in the existing technology.

One aspect of the present application provides a method for reserving bandwidth resources in a satellite network that can be executed by a controller, including:

Determine the target path of the target service in the satellite network based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. ;

The target path is sent to the ingress node of the satellite network in the form of a segment routing SR label stack, so that the ingress node that receives the data packet of the target service determines the target path based on the bandwidth reserved for the target service. The data packets are rate-limited and are forwarded preferentially in the satellite network.

In some embodiments of the present application, it also includes:

For each access satellite node corresponding to the target path, determine the paths in all topology snapshot states within the user access period;

Delete the available bandwidth on all paths in the topology snapshot state from the available bandwidth resource data;

If the data packet is processed in the satellite network, the resources occupied by the target path are released, and the available bandwidth on all paths in the topology snapshot state is restored in the available bandwidth resource data.

In some embodiments of the present application, the topology data is a global topology view; the available bandwidth resource data is an available bandwidth resource view;

Correspondingly, the bandwidth resource reservation method in the satellite network also includes:

Periodically obtain the topology information and link status information of the satellite network according to the ephemeris and real-time detection data corresponding to the satellite network;

Based on the topology information and the link status information, the connection status of each satellite in the current satellite network through the inter-satellite link and the maximum available bandwidth data of each link are updated to respectively update the global topology view and A view of the available bandwidth resources corresponding to each link in different time periods.

In some embodiments of the present application, it is determined that the target service is in the satellite network based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network, and the preset available bandwidth resource data corresponding to each link. The target path in includes:

Receive target service processing requests for satellite networks based on the Diff-Serv service model;

If it is determined that the target business processing request has resource reservation requirements, obtain the resource reservation parameters of the target business processing request;

According to the resource reservation parameters, the preset global topology view of the satellite network and the available bandwidth resource view corresponding to each link, the target path of the target service processing request is determined using a shortest path algorithm.

Another aspect of the present application provides a method for reserving bandwidth resources in a satellite network that can be executed by an ingress node in the satellite network, including:

Receive the target path of the target service sent by the controller in the form of a segment routing SR label stack, and receive the data packet of the target service from the client device, wherein the target path is the controller in advance according to the target The resource reservation parameters corresponding to the service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link are determined;

Mark the data packet of the target service with the highest forwarding priority and add it to the absolute forwarding queue to wait for the port to forward the data packet to the intermediate node in the satellite network;

Limit the rate of the data packet according to the bandwidth reserved for the target service, and perform label stacking on the data packet to push the target path of the data packet into the data packet in the form of a label stack. head.

Another aspect of the present application provides a method for reserving bandwidth resources in a satellite network that can be executed by an intermediate node in the satellite network, including:

Receive the data packet of the target service forwarded by the entry node in the satellite network, and identify the forwarding priority of the data packet;

According to the information carried in the header of the data packet, the data packet is placed in the absolute forwarding queue of the next hop forwarding port of the corresponding target path to wait for port forwarding, wherein the target path is preset by the controller according to the The resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link are determined, and then the controller uses segment routing SR label stack is sent to the entry node.

Another aspect of this application provides a device for reserving bandwidth resources in a satellite network applied to a controller, including:

The available bandwidth resource application module is used to determine the target service based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. The target path in the satellite network;

A segment routing sending module is configured to send the target path to the entry node of the satellite network in the form of a segment routing SR label stack, so that the entry node that receives the data packet of the target service, according to The bandwidth reserved by the target service limits the rate of the data packet and preferentially forwards the data packet in the satellite network.

Another aspect of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the implementation can be executed by the controller. A bandwidth resource reservation method in a satellite network, a bandwidth resource reservation method in a satellite network that can be executed by an entry node in a satellite network, or a bandwidth resource reservation method in a satellite network that can be executed by an intermediate node in a satellite network.

Another aspect of the present application provides a computer-readable storage medium on which a computer program is stored. When executed by a processor, the computer program implements a bandwidth resource reservation method in a satellite network that can be executed by a controller, and can be executed by a satellite. The bandwidth resource reservation method in the satellite network is performed by an entry node in the network or the bandwidth resource reservation method in the satellite network may be performed by an intermediate node in the satellite network.

Another aspect of the present application provides a bandwidth resource reservation system in a satellite network, including: a controller and each satellite node constituting a satellite network; each satellite node includes: an entry node and each intermediate node;

The controller is used to implement the aforementioned bandwidth resource reservation method in a satellite network that can be executed by the controller;

The entry node is used to implement the aforementioned bandwidth resource reservation method in the satellite network that can be executed by the entry node in the satellite network;

The intermediate node is used to implement the aforementioned bandwidth resource reservation method in the satellite network that can be executed by the intermediate node in the satellite network.

The bandwidth resource reservation method in the satellite network provided by this application that can be executed by the controller is based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset corresponding parameters of each link. Use the available bandwidth resource data to determine the target path of the target service in the satellite network; send the target path to the entry node of the satellite network in the form of a segment routing SR label stack, so that the target service receives the The entry node of the data packet of the target service limits the speed of the data packet according to the bandwidth reserved for the target service and preferentially forwards the data packet in the satellite network; relying on the Diff-Serv service model, in the control Based on the global bandwidth resource data maintained by the server, the end-to-end path of the service is specified through segment routing SR (Segment Routing), and the ability to combine the highest priority forwarding and ingress speed limit is used to plan the entire network service, which can be carried out on the satellite Network-wide resource reservation for services that require resource reservation ensures that services that require resource reservation receive specified service quality guarantees. It eliminates the need for frequent resource reservation configurations and at the same time, enables high-priority services to be configured. Services or services that require resource reservation can be resource reserved and maintained separately, which can effectively improve the reliability and stability of business flow processing in the satellite network.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following, or may be learned by practice of the invention. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the specification and drawings.

Those skilled in the art will understand that the objectives and advantages that can be achieved with the present application are not limited to the specific description above, and the above and other objectives that can be achieved with the present application will be more clearly understood from the following detailed description.

Description of drawings

The drawings described here are used to provide a further understanding of the present application, constitute a part of the present application, and do not constitute a limitation of the present application. The components in the figures are not to scale but merely for illustrating the principles of the application. In order to facilitate the illustration and description of certain portions of the present application, corresponding portions of the drawings may be exaggerated, ie, may be made larger relative to other components in an exemplary device actually manufactured in accordance with the present application. In the attached picture:

Figure 1 is a schematic diagram of the overall flow of a bandwidth resource reservation method in a satellite network executed by a controller in an embodiment of the present application.

Figure 2 is a schematic flowchart of a specific method for reserving bandwidth resources in a satellite network executed by a controller in an embodiment of the present application.

Figure 3 is a schematic flowchart of a specific method for reserving bandwidth resources in a satellite network executed by an entry node in an embodiment of the present application.

Figure 4 is a schematic flowchart of a specific method for reserving bandwidth resources in a satellite network executed by an intermediate node in an embodiment of the present application.

Figure 5 is a schematic structural diagram of a bandwidth resource reservation device in a satellite network in another embodiment of the present application.

Figure 6 is a system architecture diagram of the bandwidth resource reservation method in the satellite network provided by the application example of this application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments and descriptions of the present application are used to explain the present application, but are not used to limit the present application.

Here, it should also be noted that, in order to avoid obscuring the present application with unnecessary details, only the structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, and the relevant information is omitted. Other details are less relevant to this application.

It should be emphasized that the term "comprising" when used herein refers to the presence of features, elements, steps or components but does not exclude the presence or addition of one or more other features, elements, steps or components.

Here, it should also be noted that, unless otherwise specified, the term "connection" in this article may not only refer to a direct connection, but may also refer to an indirect connection with an intermediate.

Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

With the rapid development of Internet applications, the "best effort" working model in the early days of the Internet can no longer meet people's needs. Network communications have put forward higher requirements for network service capabilities. As a result, the concept of QoS and related technologies emerged as the times require. . QoS (Quality of Service) is the abbreviation of Quality of Service. It refers to the network's ability to use a variety of basic technologies to provide better service capabilities for designated network communications. It is a technology that reduces network latency and solves congestion.

Currently, QoS mainly provides three service models: Best-Effort service (best effort service model), Integrated service (integrated service model, referred to as Int-Serv), and Differentiated service (differentiated service model, referred to as Diff-Serv). Best-Effort is the default service type of the Internet. Applications can send any number of packets at any time, and the network uses a first-in-first-out (FIFO) queue to send packets as much as possible. It does not provide bandwidth, delay, reliability, etc. Any guarantee of a best-effort service does not essentially fall within the scope of QoS.

Int-Serv is a comprehensive service model that can provide two services: guaranteed service and load control. The guaranteed service provides guaranteed bandwidth and delay; the load control service ensures that even if the network is overloaded, it can still provide services similar to those that are not overloaded. . This model uses the Resource Reservation Protocol (RSVP). Applications that require QoS services first notify the network of their own traffic parameters and service quality requirements, so that the routing nodes from the source to the destination reserve corresponding resources for them. Resources. After confirming that the network has reserved resources for the application's packets, the application can send the packets. This mode reserves resources on the path for each network service flow in advance, providing fine-grained quality of service differentiation for the network. However, when there are too many application flows in the network and the network data traffic is too large, the network equipment will bear huge storage requirements. and processing pressure, it is difficult to provide QoS services for every flow.

Diff-Serv is a multi-service model. Unlike Int-Serv, Diff-Serv does not require the use of RSVP signaling. It is a class-based QoS technology that mainly includes traffic classification and marking, congestion management and congestion avoidance, traffic monitoring, etc. technology. At the edge of the network, the network device inspects the contents of the traffic packets entering the network. By classifying and marking the packets, the packets are divided into different and limited behavior sets, and each set has a unique DS code point identifier. In the core network, different forwarding strategies are adopted for each packet based on the identifier to provide differentiated services for data packets. Differentiated Services does not need to save flow status and signaling information, and its scalability is better than Int-Serv, but it is difficult to provide service guarantees for flow-based end-to-end quality.

The specific technologies of QoS mainly include traffic classification and marking, congestion management, congestion avoidance, traffic policing, traffic shaping, etc. Traffic classification and marking generally divides traffic into multiple priorities or service classes based on the CoS field of the Ethernet frame, the first three digits of the ToS field in the IP header, the first six digits of the DSCP field, and the EXP field of MPLS, so that the processing of the packets The system or device can process the packets according to the agreement; congestion management technology refers to the use of queue technology for management and control when congestion occurs. Packets sent from the same port are put into multiple queues to wait, and are sent according to the queue priority. , commonly used queuing technologies include FIFO, PQ, CQ, WFQ, CBQ, RTP priority queue, etc.; congestion avoidance is a technology to avoid TCP global synchronization caused by packets being discarded after the queue exceeds the specified length. WRED can be detected early through weighted random Packets are randomly discarded before congestion occurs; traffic policing CAR and traffic shaping GTS technologies both use token bucket technology to control traffic.

The existing Diff-Serv service model divides different business requests into a limited number of business categories, and provides services for the overall aggregated flow by aggregating business flows with the same characteristics, instead of targeting individual business flows. The forwarding status of each application flow or each user is no longer maintained, so it is difficult to provide quality assurance for specific business flows and achieve strict resource reservation and service quality assurance.

Although the existing Int-Serv service model can independently maintain the forwarding status of each business flow or user, when the number of data flows is large, the device will face huge storage and processing pressure, and the scalability is very poor; in addition, due to In the satellite network, satellites move at high speeds, topology changes dynamically, and the relative positions between satellites continue to change, resulting in continuous changes in the routes of the satellite network. If the Int-Serv service model is still used to provide QoS services, RSVP signaling will be frequently used for global resource reservation. configuration, which leads to excessive configuration overhead. Therefore, RSVP technology is not suitable for providing quality assurance services in highly dynamic satellite networks.

This application proposes a Diff-Serv service model in which all business flows are processed by class or priority in the Diff-Serv differentiated service model, in order to provide strict resource reservation for services that require resource reservation. Basically, the resource reservation method based on segment routing and global ingress rate limiting ensures that services with resource reservation requirements can obtain specified service quality guarantees, achieving high-priority services without the need for frequent resource reservation configurations. Businesses or businesses that require resource reservation can reserve resources and maintain them individually.

Based on this, embodiments of the present application provide a method for reserving bandwidth resources in a satellite network that can be executed by a controller. Referring to Figure 1, the method for reserving bandwidth resources in a satellite network that can be executed by a controller specifically includes the following content :

Step 100: Determine whether the target service is in the satellite network based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. target path.

In step 100, the resource reservation parameters may include two parameters: starting point and end point of end-to-end resource reservation, required bandwidth, and so on.

Step 200: Send the target path to the ingress node of the satellite network in the form of a segment routing SR label stack, so that the ingress node that receives the data packet of the target service will reserve the target path for the target service. The bandwidth of the data packet is rate-limited and the data packet is forwarded preferentially in the satellite network.

It can be understood that when the control plane delivers paths to data plane nodes, it will deliver the paths to the user's access satellites in the future, and calculate all topologies within the user's access period for each access satellite. The path in snapshot state.

As can be seen from the above description, the bandwidth resource reservation method in the satellite network that can be executed by the controller provided by the embodiment of the present application relies on the Diff-Serv service model and uses segmented routing SR on the basis of the controller maintaining global bandwidth resource data. (Segment Routing) specifies the end-to-end path that the service passes, combines the highest priority forwarding and ingress speed limiting capabilities to carry out network-wide service planning, and can provide resources for services that require resource reservation within the entire satellite network. Reservation can ensure that services with resource reservation requirements receive specified service quality guarantees. While frequent resource reservation configuration is not required, resource reservation and independent resource reservation can be performed for high-priority services or services that require resource reservation. maintenance, which can effectively improve the reliability and stability of business flow processing in satellite networks.

In order to effectively improve the operational reliability and stability of the bandwidth resource reservation process in the satellite network, in the bandwidth resource reservation method in the satellite network that can be executed by the controller provided in the embodiment of the present application, referring to Figure 2, it can be After step 200 in the bandwidth resource reservation method in the satellite network performed by the controller, the following content is specifically included:

Step 300: For each access satellite node corresponding to the target path, determine the paths in all topology snapshot states within the user access period.

Step 400: Delete the available bandwidth on all paths in the topology snapshot state from the available bandwidth resource data.

Step 500: If the data packet is processed in the satellite network, release the resources occupied by the target path, and restore the available bandwidth on all paths in the topology snapshot state in the available bandwidth resource data.

It is understandable that after the path is delivered, the controller will deduct the available bandwidth on the path allocated by the resource reservation service from the global available bandwidth view. Note that in this process, the bandwidth deduction is based on time periods, that is, only when the service passes through the specified path, the corresponding bandwidth will be deducted from the bandwidth view.

When the resource reservation service ends, the control plane releases the relevant resource occupation and restores the bandwidth deducted for the service in the available resource view.

As can be seen from the above description, the bandwidth resource reservation method in the satellite network that can be executed by the controller provided by the embodiment of the present application can effectively improve the satellite network by promptly updating the global view and promptly releasing the service after the service flow processing is completed. The operational reliability and stability of the medium-bandwidth resource reservation process can further improve the reliability and effectiveness of business flow processing in the star network.

In order to improve the reliability, convenience and efficiency of determining the target path of the target service in the satellite network based on topology information and available bandwidth resource data, embodiments of the present application provide a satellite network that can be executed by a controller. In the medium bandwidth resource reservation method, the topology data is a global topology view; the available bandwidth resource data is an available bandwidth resource view; see Figure 2, in the bandwidth resource reservation method in the satellite network that can be executed by the controller Before step 100, the following content is specifically included:

Step 010: Periodically obtain the topology information and link status information of the satellite network based on the ephemeris and real-time detection data corresponding to the satellite network.

Step 020: Update the connection status of each satellite in the current satellite network through the inter-satellite link and the maximum available bandwidth data of each link based on the topology information and the link status information, so as to respectively update the global situation of the satellite network Topology view and available bandwidth resource view corresponding to each link in different time periods.

It can be understood that the controller of the satellite network collects topology information and link status information of the entire satellite network through ephemeris and real-time detection. Maintain a view of the connection status of satellites in the current network through inter-satellite links and the maximum available bandwidth of each link. Obtain a view of the available bandwidth of the entire network through the resource allocation maintained locally on the control plane.

Among them, the view of available bandwidth resources is based on time periods.

As can be seen from the above description, the embodiment of the present application provides a method for reserving bandwidth resources in a satellite network that can be executed by a controller, by updating each satellite in the current satellite network through the inter-satellite link based on the topology information and the link status information. The connection status of the link and the maximum available bandwidth data of each link are updated respectively to update the global topology view of the satellite network and the available bandwidth resource view corresponding to each link in different time periods, which can effectively improve the efficiency of the satellite network according to the topology information and available bandwidth resources. The data determines the reliability, convenience and efficiency of the target path of the target service in the satellite network, which can further improve the efficiency and reliability of the bandwidth resource reservation process in the satellite network.

In order to further improve the efficiency and planning rationality of the service flow processing process in the satellite network, in the bandwidth resource reservation method in the satellite network that can be executed by the controller provided by the embodiment of the present application, referring to Figure 2, the bandwidth resource reservation method can be executed by the controller. The executed step 100 in the bandwidth resource reservation method in the satellite network specifically includes the following content:

Step 110: Receive a target service processing request for the satellite network based on the Diff-Serv service model.

Step 120: If it is determined that the target service processing request has resource reservation requirements, obtain the resource reservation parameters of the target service processing request.

Step 130: Use the shortest path algorithm to determine the target path of the target service processing request based on the resource reservation parameters, the preset global topology view of the satellite network, and the available bandwidth resource view corresponding to each link.

It can be understood that when a new service requires resource reservation, the control plane will be notified of the starting point and end point of the end-to-end resource reservation and the required bandwidth through the service plane.

In the global topology view and available resource view, combined with the end-to-end resource reservation requirements of the business, use the shortest path algorithm or other path calculation algorithms to calculate the end-to-end path where the remaining bandwidth resources in the current topology can meet the bandwidth reservation requirements. . If a path that meets the bandwidth requirement can be found, the resource reservation service is allowed to access. If a path with remaining bandwidth that meets the bandwidth reservation requirement cannot be found, the service's resource reservation request is rejected.

It can be seen from the above description that the bandwidth resource reservation method in the satellite network that can be executed by the controller provided by the embodiment of the present application can determine the target path of the target service processing request by using the shortest path algorithm, and can ensure that there is a resource reservation requirement. On the basis of ensuring the specified service quality for the business, it further improves the efficiency and planning rationality of the business flow processing process in the satellite network.

Embodiments of the present application also provide a method for reserving bandwidth resources in a satellite network that can be executed by an entry node in the satellite network. Referring to Figure 3, the method for reserving bandwidth resources in a satellite network that can be executed by an entry node specifically includes: The following content:

Step 610: Receive the target path of the target service sent by the controller in the form of a segment routing SR label stack, and receive the data packet of the target service from the client device, where the target path is pre-set by the controller according to The resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link are determined.

Step 620: Mark the data packet of the target service with the highest forwarding priority and add it to the absolute forwarding queue to wait for the port to forward the data packet to the intermediate node in the satellite network.

Step 630: Limit the rate of the data packet according to the bandwidth reserved for the target service, and perform label stacking on the data packet to push the target path of the data packet into the label stack in the form of a label stack. The header of the packet.

It can be understood that step 610 is performed after step 200.

As can be seen from the above description, the bandwidth resource reservation method in the satellite network that can be executed by the entry node in the satellite network provided by the embodiment of the present application relies on the Diff-Serv service model and on the basis of the controller maintaining global bandwidth resource data, through Segment routing SR specifies the end-to-end path that the service passes. The ingress node combines the highest priority forwarding and ingress speed limiting capabilities, and combines the intermediate nodes to conduct network-wide service planning, which can realize resource reservation within the entire satellite network. Reservation of resources for services with resource reservation requirements can ensure that services with resource reservation requirements receive specified service quality guarantees. While frequent resource reservation configuration is not required, high-priority services or services that require resource reservation can be Resource reservation and separate maintenance can effectively improve the reliability and stability of business flow processing in satellite networks.

Embodiments of the present application also provide a method for reserving bandwidth resources in a satellite network that can be executed by an intermediate node in the satellite network. Referring to Figure 4, the method for reserving bandwidth resources in a satellite network that can be executed by an intermediate node specifically includes: The following content:

Step 710: Receive the data packet of the target service forwarded by the entry node in the satellite network, and identify the forwarding priority of the data packet.

Step 720: According to the information carried in the header of the data packet, place the data packet in the absolute forwarding queue of the next hop forwarding port of the corresponding target path to wait for port forwarding, wherein the target path is controlled in advance. The controller determines based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link, and then the controller uses segmented routing SR label stack is sent to the entry node.

It can be understood that step 710 is performed after step 630.

As can be seen from the above description, the bandwidth resource reservation method in the satellite network provided by the embodiment of the present application can be executed by the intermediate node in the satellite network, relying on the Diff-Serv service model and on the basis of the controller maintaining global bandwidth resource data. Segment Routing SR (Segment Routing) specifies the end-to-end path that the service passes. The ingress node combines the highest priority forwarding and ingress speed limiting capabilities, and combines with the intermediate node to conduct network-wide service planning, which can be implemented within the entire satellite network. Reserving resources for services that require resource reservations can ensure that services that require resource reservations receive specified service quality guarantees. It eliminates the need for frequent resource reservation configurations and at the same time, can provide high-priority services or services that require resource reservations. The reserved services can be resource reserved and maintained separately, which can effectively improve the reliability and stability of business flow processing in the satellite network.

From a software level, the present application also provides a device for reserving bandwidth resources in a satellite network for executing all or part of the aforementioned method for reserving bandwidth resources in a satellite network that can be controlled by a controller. See Figure 5. The bandwidth resource reservation device in the satellite network specifically includes the following content:

The available bandwidth resource application module 10 is used to determine the target service based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. Target path within the satellite network.

The segment routing sending module 20 is configured to send the target path to the entry node of the satellite network in the form of a segment routing SR label stack, so that the entry node that receives the data packet of the target service, according to The bandwidth reserved for the target service limits the rate of the data packet and preferentially forwards the data packet in the satellite network.

The embodiment of the bandwidth resource reservation device in the satellite network provided by this application can be specifically used to execute the processing flow of the embodiment of the bandwidth resource reservation method in the satellite network that can be controlled by the controller in the above embodiment. Its function is as follows: Without going into details, reference may be made to the detailed description of the above embodiments of a bandwidth resource reservation method in a satellite network that can be controlled by a controller. In addition, the bandwidth resource reservation device in the satellite network may be used to perform the functions of the above-mentioned intermediate node or entry node.

The part of the bandwidth resource reservation device in the satellite network that reserves the bandwidth resources in the satellite network can be executed in the server. In another practical application situation, all operations can also be completed in the client device. Specifically, the selection may be made based on the processing capabilities of the client device and restrictions on user usage scenarios. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor for specific processing of bandwidth resource reservation in the satellite network.

The above-mentioned client device may have a communication module (ie, communication unit), which may communicate with a remote server to realize data transmission with the server. The server may include a server on the task dispatching center side. In other implementation scenarios, it may also include a server of an intermediate platform, such as a server of a third-party server platform that has a communication link with the task dispatching center server. The server may include a single computer device, a server cluster composed of multiple servers, or a server structure of distributed devices.

Any suitable network protocol may be used for communication between the server and the client device, including network protocols that have not yet been developed as of the filing date of this application. The network protocol may include, for example, TCP/IP protocol, UDP/IP protocol, HTTP protocol, HTTPS protocol, etc. Of course, the network protocol may also include, for example, RPC protocol (Remote Procedure Call Protocol, Remote Procedure Call Protocol), REST protocol (Representational State Transfer, Representational State Transfer Protocol), etc. used on top of the above-mentioned protocols.

As can be seen from the above description, the bandwidth resource reservation device in the satellite network provided by the embodiment of the present application relies on the Diff-Serv service model and, on the basis of the controller maintaining global bandwidth resource data, specifies the terminal through which the service passes through the segment routing SR. The end-to-end path combines the highest priority forwarding and ingress speed limiting capabilities to carry out network-wide service planning. It can reserve resources for services that require resource reservation within the entire satellite network, and can ensure resource reservation requirements. The services are guaranteed with specified service quality. While there is no need for frequent resource reservation configuration, resources can be reserved and maintained separately for high-priority services or services that require resource reservation, which can effectively improve the services in the satellite network. Stream processing reliability and stability.

Based on the above embodiments, this application also provides a bandwidth resource reservation system in a satellite network, which specifically includes the following content:

The controller and each satellite node constituting the satellite network; each satellite node includes: an entry node and each intermediate node.

The controller is used to implement the bandwidth resource reservation method in the satellite network shown in Figure 1 or Figure 2.

The entry node is used to implement the bandwidth resource reservation method in the satellite network shown in Figure 3.

The intermediate node is used to implement the bandwidth resource reservation method in the satellite network shown in Figure 4.

In order to further illustrate this solution, this application also provides a specific application example of a bandwidth resource reservation method in a satellite network. Relying on the Diff-Serv service model, on the basis of the controller maintaining a global bandwidth resource view, it specifies the end-to-end path that the service passes through segment routing (SR), combining the highest priority forwarding and ingress speed limiting capabilities. , carry out network-wide business planning, and realize resource reservation for specific services within the entire satellite network.

The main steps of resource reservation are divided into control plane and data plane. On the control plane side, the processing process includes global view acquisition and maintenance, business resource reservation request arrival, path planning and admission control, path delivery, global view update, etc. On the data side, the processing process includes priority mapping, bandwidth rate limiting, label stacking, intermediate node processing, etc. Referring to Figure 6, the bandwidth resource reservation method in the satellite network specifically includes the following content:

(1) Control surface

1. Global view acquisition and maintenance

The controller of the satellite network collects topology information and link status information of the entire satellite network through ephemeris and real-time detection. Maintain a view of the connection status of satellites in the current network through inter-satellite links and the maximum available bandwidth of each link. Obtain a view of the available bandwidth of the entire network through the resource allocation maintained locally on the control plane.

Note that the available bandwidth resource view is time-based, and its format is shown in Table 1.

Table 1

2. Request reserved resources after the business arrives

When a new service requires resource reservation, the control plane is notified through the service plane of the starting point and end point of the end-to-end resource reservation and the required bandwidth.

3. Path planning and access control

In the global topology view and available resource view, combined with the end-to-end resource reservation requirements of the business, use the shortest path algorithm or other path calculation algorithms to calculate the end-to-end path where the remaining bandwidth resources in the current topology can meet the bandwidth reservation requirements. . If a path that meets the bandwidth requirement can be found, the resource reservation service is allowed to access. If a path with remaining bandwidth that meets the bandwidth reservation requirement cannot be found, the service's resource reservation request is rejected.

4. Path distribution

The control plane delivers the calculated end-to-end path in the form of a segment routing SR label stack to the entry node of the data plane service. When the control plane delivers paths to data plane nodes, it will deliver the paths to the user's access satellites in the future, and calculate the paths in all topology snapshot states for each access satellite during the user's access period. .

5.Global view update

After the path is delivered, the controller will deduct the available bandwidth on the path allocated by the resource reservation service from the global available bandwidth view. Note that in this process, the bandwidth deduction is based on time periods, that is, only when the service passes through the specified path, the corresponding bandwidth will be deducted from the bandwidth view.

6. Business release

When the resource reservation service ends, the control plane releases the relevant resource occupation and restores the bandwidth deducted for the service in the available resource view.

The above is the processing logic of the control plane. The processing logic of the data plane is as follows:

(2) Data surface

1. Priority mapping

Each satellite node in the data plane maintains several queues on each port. Among them, one queue adopts absolute forwarding priority, which is called the absolute forwarding queue. That is, whenever there is a data packet queuing in this queue, the port will give priority to forwarding the data packets in this queue. Until all data packets in this queue are successfully forwarded, the port will further forward data in other queues. Bag.

When arriving at the data plane satellite node device, the satellite node device marks the data packets with bandwidth reservation requirements with the highest forwarding priority, and then places them in the absolute forwarding queue to be forwarded by the port.

2. Bandwidth speed limit

When a specific service flow is sent from the user terminal to the access satellite node, the node limits the speed of the accessed service flow, and the value of the speed limit is the bandwidth reserved for the service.

3. Label pushing and packet forwarding

The data plane satellite node stacks labels on the service data packets, and pushes the path the data packets will take into the header of the data packets in the form of a label stack, as shown in Figure 6.

4. Intermediate node processing

When the service data packet is forwarded to the intermediate node through the service entry node, the intermediate node identifies the priority of the data packet, recognizes that it is the highest forwarding priority, and places the data packet in combination with the label information carried in the header of the data packet. in the absolute forwarding queue of the next hop forwarding port.

After the above steps, the resource reservation within the satellite network bearer network can be completed.

Special attention should be paid to:

Each service has access priority. Access priority refers to the order priority of resource reservation requests being accessed by the network when there are multiple resource reservation requests at the network entrance. When the calculated bandwidth of each link in the path fails to meet the service request resources, the controller will determine the access priority of the service and process it. The access priority of the service is agreed in advance with the operator before running the service. New services with high access priority can occupy the transmission bandwidth of services with low access priority. When there are already many services in the network, resulting in a large amount of bandwidth resources being occupied and insufficient resource reservation for new services, it is necessary to compare the access priorities of the new services and the services being transmitted.

In summary, the above method provided by the application example of this application proposes a resource reservation method that combines SR and differentiated services in the satellite network; and proposes a queue scheduling method for absolute forwarding of the highest priority in the differentiated service model. ; Proposed a method to limit the bandwidth speed of the highest priority services in the differentiated service model and realize global bandwidth resource planning through SR explicit path planning; the SR-based resource reservation scheme can achieve high efficiency in the dynamic environment of satellite networks Simple configuration; a process method for the controller in the satellite SR network to maintain and update the global resource view is proposed to provide a calculation basis for resource reservation services; a combined working method of access priority and forwarding priority is designed to provide resources Provide further resource reservation solutions on the basis of reserved services. The innovation of this application is the use of the Diff-Serv differentiated service model to achieve resource reservation. Set priority forwarding for services. Services that require resource reservation in terms of bandwidth can be set as absolute forwarding priority, and the rate of service entry can be limited. Combined with the display path planning and global resource view brought by SR, resources under Diff-Serv can be realized Reserved. In addition, for access points that change frequently in satellite networks, the SR mechanism does not require a lot of reconfiguration. It only needs to be configured at the service entrance, avoiding a lot of reconfiguration overhead.

The embodiment of the present application also provides a computer device (that is, an electronic device). The computer device may include a processor, a memory, a receiver, and a transmitter. The processor is configured to execute the satellite executed by any execution subject mentioned in the above embodiment. A method for reserving bandwidth resources in a network, in which the processor and the memory can be connected through a bus or other means, taking the connection through a bus as an example. The receiver can be connected to the processor and memory through wired or wireless means. The computer equipment is communicatively connected to a bandwidth resource reservation device in the satellite network to receive real-time motion data from sensors in the wireless multimedia sensor network and receive original video sequences from the video collection device.

The processor may be a central processing unit (Central Processing Unit, CPU). The processor can also be other general-purpose processors, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other Chips such as programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of these types of chips.

As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as the bandwidth resource prediction in the satellite network executed by any execution subject in the embodiment of the present application. Save the program instructions/modules corresponding to the method. The processor executes various functional applications and data processing of the processor by running non-transient software programs, instructions and modules stored in the memory, that is, implementing the bandwidth resource reservation method in the satellite network in the above method embodiment.

The memory may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.

The one or more modules are stored in the memory, and when executed by the processor, execute the bandwidth resource reservation method in the satellite network executed by any execution subject in the embodiment.

In some embodiments of the present application, the user equipment may include a processor, a memory, and a transceiver unit. The transceiver unit may include a receiver and a transmitter. The processor, memory, receiver, and transmitter may be connected through a bus system. The memory may be In order to store computer instructions, the processor is used to execute the computer instructions stored in the memory to control the transceiver unit to send and receive signals.

As an implementation method, the functions of the receiver and transmitter in this application can be implemented by a transceiver circuit or a dedicated chip for transceiving, and the processor can be implemented by a dedicated processing chip, processing circuit or general-purpose chip.

As another implementation manner, a general-purpose computer may be considered to implement the server provided by the embodiments of this application. The program codes that implement the functions of the processor, receiver and transmitter are stored in the memory, and the general-purpose processor implements the functions of the processor, receiver and transmitter by executing the codes in the memory.

Embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored. The computer program, when executed by a processor, implements the steps of the bandwidth resource reservation method in a satellite network executed by any execution subject. The computer readable storage medium may be a tangible storage medium such as random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, floppy disk, hard disk, removable storage disk, CD-ROM, or any other form of storage medium known in the art.

Those of ordinary skill in the art should understand that each exemplary component, system and method described in conjunction with the embodiments disclosed herein can be implemented in hardware, software or a combination of both. Whether it is implemented in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, or the like. When implemented in software, elements of the application are programs or code segments that are used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communications link via a data signal carried in a carrier wave.

To be clear, this application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications and additions, or change the order between steps after understanding the spirit of the present application.

Features described and/or illustrated in this application with respect to one embodiment may be used in the same or in a similar manner in one or more other embodiments and/or may be combined with or substituted for features of other embodiments. Features of Embodiments.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (10)

1. A method for reserving bandwidth resources in a satellite network, which is characterized by including: Determine the target path of the target service in the satellite network based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. ; The target path is sent to the ingress node of the satellite network in the form of a segment routing SR label stack, so that the ingress node that receives the data packet of the target service determines the target path based on the bandwidth reserved for the target service. The data packets are rate-limited and are forwarded preferentially in the satellite network. 2. The method for reserving bandwidth resources in a satellite network according to claim 1, further comprising: For each access satellite node corresponding to the target path, determine the paths in all topology snapshot states within the user access period; Delete the available bandwidth on all paths in the topology snapshot state from the available bandwidth resource data; If the data packet is processed in the satellite network, the resources occupied by the target path are released, and the available bandwidth on all paths in the topology snapshot state is restored in the available bandwidth resource data. 3. The bandwidth resource reservation method in a satellite network according to claim 1, characterized in that the topology data is a global topology view; the available bandwidth resource data is an available bandwidth resource view; Correspondingly, the bandwidth resource reservation method in the satellite network also includes: Periodically obtain the topology information and link status information of the satellite network according to the ephemeris and real-time detection data corresponding to the satellite network; Based on the topology information and the link status information, the connection status of each satellite in the current satellite network through the inter-satellite link and the maximum available bandwidth data of each link are updated to respectively update the global topology view and A view of the available bandwidth resources corresponding to each link in different time periods. 4. The bandwidth resource reservation method in a satellite network according to claim 3, characterized in that the resource reservation parameters corresponding to the target service, the topology data of the satellite network and the preset available bandwidth corresponding to each link Resource data determines the target path of the target service in the satellite network, including: Receive target service processing requests for satellite networks based on the Diff-Serv service model; If it is determined that the target business processing request has resource reservation requirements, obtain the resource reservation parameters of the target business processing request; According to the resource reservation parameters, the preset global topology view of the satellite network and the available bandwidth resource view corresponding to each link, the target path of the target service processing request is determined using a shortest path algorithm. 5. A method for reserving bandwidth resources in a satellite network, which is characterized by including: Receive the target path of the target service sent by the controller in the form of a segment routing SR label stack, and receive the data packet of the target service from the client device, wherein the target path is the controller in advance according to the target The resource reservation parameters corresponding to the service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link are determined; Mark the data packet of the target service with the highest forwarding priority and add it to the absolute forwarding queue to wait for the port to forward the data packet to the intermediate node in the satellite network; Limit the rate of the data packet according to the bandwidth reserved for the target service, and perform label stacking on the data packet to push the target path of the data packet into the data packet in the form of a label stack. head. 6. A method for reserving bandwidth resources in a satellite network, which is characterized by including: Receive the data packet of the target service forwarded by the entry node in the satellite network, and identify the forwarding priority of the data packet; According to the information carried in the header of the data packet, the data packet is placed in the absolute forwarding queue of the next hop forwarding port of the corresponding target path to wait for port forwarding, wherein the target path is preset by the controller according to the The resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link are determined, and then the controller uses segment routing SR label stack is sent to the entry node. 7. A device for reserving bandwidth resources in a satellite network, which is characterized in that it includes: The available bandwidth resource application module is used to determine the target service based on the resource reservation parameters corresponding to the target service, the topology data of the satellite network based on the Diff-Serv service model, and the preset available bandwidth resource data corresponding to each link. The target path in the satellite network; A segment routing sending module is configured to send the target path to the entry node of the satellite network in the form of a segment routing SR label stack, so that the entry node that receives the data packet of the target service, according to The bandwidth reserved by the target service limits the rate of the data packet and preferentially forwards the data packet in the satellite network. 8. An electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that when the processor executes the computer program, any of claims 1 to 4 is implemented. The bandwidth resource reservation method in a satellite network described in one of the claims, the bandwidth resource reservation method in a satellite network described in claim 5, or the bandwidth resource reservation method in a satellite network described in claim 6. 9. A computer-readable storage medium with a computer program stored thereon, characterized in that when the computer program is executed by a processor, the method for reserving bandwidth resources in a satellite network as claimed in any one of claims 1 to 4 is implemented. . The method for reserving bandwidth resources in a satellite network according to claim 5 or the method for reserving bandwidth resources in a satellite network according to claim 6. 10. A bandwidth resource reservation system in a satellite network, characterized in that it includes: a controller and each satellite node constituting a satellite network; each satellite node includes: an entry node and each intermediate node; The controller is used to implement the bandwidth resource reservation method in a satellite network according to any one of claims 1 to 4; The entry node is used to implement the bandwidth resource reservation method in the satellite network according to claim 5; The intermediate node is used to implement the bandwidth resource reservation method in the satellite network described in claim 6.