CN114629857A - Method, device and system for reserving bandwidth resources in satellite network - Google Patents
Method, device and system for reserving bandwidth resources in satellite network Download PDFInfo
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Abstract
The application provides a method, a device and a system for reserving bandwidth resources 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 resource reservation parameters corresponding to the target service, topological data of the satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link; and sending the target path to an inlet node of the satellite network in a sectional routing SR label stack mode, so that the inlet 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 preferentially forwards the data packet in the satellite network. The method and the device can perform resource reservation for services with resource reservation requirements in the whole network range of the satellite network and ensure the service quality, and can perform resource reservation and independent maintenance on high-priority services or services requiring resource reservation while not requiring frequent resource reservation configuration.
Description
Technical Field
The present application relates to the field of satellite network technologies, and in particular, to a method, an apparatus, and a system for reserving bandwidth resources in a satellite network.
Background
The satellite network usually adopts QoS (quality of service) to guarantee the service capability of network communication to the network, and in three service models mainly provided by the current QoS, Differentiated service (Diff-Serv for short) is used to provide better service. Diff-Serv is a class-based QoS technology, and mainly comprises technologies such as flow classification and marking, congestion management and congestion avoidance, and flow supervision. At the edge of the network, the network equipment checks the content of the flow data packet entering the network, and classifies and marks the data packet, so that the data packet is divided into different and limited action sets, each set has a unique DS coding point identifier, and different forwarding strategies are adopted in the core network according to the identifiers to provide differential service for the data packet. The differentiated service does not need to store the flow state and the signaling information, has good expandability, but is difficult to provide service guarantee for the end-to-end quality based on the flow.
At present, the existing Diff-Serv service model divides different service requests into a limited number of service classes, provides services for an integral aggregate flow by aggregating service flows with the same characteristics, is not oriented to a single service flow, and does not maintain the forwarding state of each application program flow or each user, so that it is difficult to provide quality assurance for specific service flows, and strict resource reservation and service quality assurance cannot be realized.
Therefore, it is needed to design a way to provide strict resource reservation for the service with resource reservation requirement in the mode that the Diff-Serv differentiated services model processes all the service flows according to classes or priorities.
Disclosure of Invention
In view of this, embodiments of the present application provide a method, an apparatus, and a system for reserving bandwidth resources in a satellite network, so as to obviate or mitigate one or more of the disadvantages in the prior art.
An aspect of the present application provides a bandwidth resource reservation method in a satellite network, which may be performed by a controller, including:
determining a target path of a target service in a satellite network according to resource reservation parameters corresponding to the target service, topological data of the satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link;
and sending the target path to an entrance node of the satellite network in a sectional routing SR label stack mode, so that the entrance 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 preferentially forwards the data packet in the satellite network.
In some embodiments of the present application, further comprising:
determining paths in all topology snapshot states in a user access time period aiming at each access satellite node corresponding to the target path;
deleting available bandwidth on paths in all topology snapshot states from the available bandwidth resource data;
and if the data packet is processed in the satellite network, releasing the resources occupied by the target path, and recovering the available bandwidth on the path in all the topology snapshot states 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 method for reserving bandwidth resources in the satellite network further comprises the following steps:
periodically acquiring topology information and link state information of the satellite network according to ephemeris and real-time detection data corresponding to the satellite network;
and updating the connection state 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 state information so as to respectively update the global topology view of the satellite network and the time-interval available bandwidth resource view corresponding to each link.
In some embodiments of the present application, the determining a target path of a target service in a satellite network according to a resource reservation parameter corresponding to the target service, topology data of the satellite network, and preset available bandwidth resource data corresponding to each link includes:
receiving a target service processing request aiming at a satellite network based on a Diff-Serv service model;
if the target service processing request is determined to have the resource reservation requirement, acquiring a resource reservation parameter of the target service processing request;
and determining a target path of the target service processing request by a shortest path algorithm according to the resource reservation parameters, a preset global topology view of the satellite network and available bandwidth resource views corresponding to all links.
Another aspect of the present application provides a method for bandwidth resource reservation in a satellite network, which may be performed by an entry node in the satellite network, including:
receiving a target path of a target service sent by a controller in a form of a Segment Routing (SR) label stack, and receiving a data packet of the target service from a client device, wherein the target path is determined by the controller in advance according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model and available bandwidth resource data corresponding to preset links;
marking the data packet of the target service with the highest forwarding priority and adding the data packet into an absolute forwarding queue to wait for a port to forward the data packet to an intermediate node in the satellite network;
and limiting the speed of the data packet according to the bandwidth reserved for the target service, and performing label stack pressing on the data packet so as to press the target path of the data packet into the head of the data packet in a label stack manner.
Another aspect of the present application provides a method for bandwidth resource reservation in a satellite network, which may be performed by an intermediate node in the satellite network, including:
receiving a data packet of a target service forwarded by an entrance node in a satellite network, and identifying the forwarding priority of the data packet;
and placing the data packet in an absolute forwarding queue of a next hop forwarding port of a corresponding target path according to information carried by the head of the data packet for port forwarding, wherein the target path is determined in advance by a controller according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link, and then sending the data packet to the entry node by the controller in the form of a segment routing SR label stack.
Another aspect of the present application provides a bandwidth resource reservation apparatus applied to a satellite network of a controller, including:
the available bandwidth resource application module is used for determining a target path of the target service in the satellite network according to resource reservation parameters corresponding to the target service, topology data of the satellite network based on a Diff-Serv service model and available bandwidth resource data corresponding to preset links;
and the segmented route issuing module is used for sending the target path to an entrance node of the satellite network in a segmented route SR label stack mode so as to enable the entrance node receiving the data packet of the target service to limit the speed of the data packet according to the bandwidth reserved for the target service and to preferentially forward the data packet in the satellite network.
Another aspect of the present application provides an electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing a method for bandwidth resource reservation in a satellite network that may be performed by the controller, a method for bandwidth resource reservation in a satellite network that may be performed by an entry node in a satellite network, or a method for bandwidth resource reservation in a satellite network that may be performed by an intermediate node in a satellite network when executing the computer program.
Another aspect of the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for reserving bandwidth resources in a satellite network, which may be performed by a controller, a method for reserving bandwidth resources in a satellite network, which may be performed by an entry node in a satellite network, or a method for reserving bandwidth resources in a satellite network, which may be performed by an intermediate node in a 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 of the satellite nodes includes: an ingress node and each intermediate node;
the controller is used for realizing the bandwidth resource reservation method in the satellite network, which can be executed by the controller;
the access node is used for realizing the bandwidth resource reservation method in the satellite network, which can be executed by the access node in the satellite network;
the intermediate node is configured to implement the aforementioned bandwidth resource reservation method in a satellite network, which may be performed by the intermediate node in the satellite network.
According to the bandwidth resource reservation method in the satellite network, which can be executed by a controller, the target path of the target service in the satellite network is determined according to the resource reservation parameters corresponding to the target service, the topological data of the satellite network based on a Diff-Serv service model and the available bandwidth resource data corresponding to each preset link; sending the target path to an entry node of the satellite network in a form of a Segment Routing (SR) label stack, so that the entry node receiving a data packet of the target service limits the speed of the data packet according to a bandwidth reserved for the target service and preferentially forwards the data packet in the satellite network; based on a Diff-Serv service model, on the basis that a controller maintains global bandwidth resource data, an end-to-end path passed by a service is designated by a segmented routing SR (segment routing), and the capability of highest priority forwarding and entrance speed limiting is combined to plan the whole network service, so that the resource reservation can be carried out on the service with the resource reservation requirement in the whole network range of a satellite network, the service with the resource reservation requirement can be ensured to obtain the designated service quality, the resource reservation and the independent maintenance can be carried out on the high-priority service or the service with the resource reservation requirement while the resource reservation configuration is not required to be frequently carried out, and the reliability and the stability of service flow processing in the satellite network can be effectively improved.
Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present application are not limited to what has been particularly described hereinabove, and that the above and other objects that can be achieved with the present application will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. For purposes of illustrating and describing certain portions of the present application, the drawings may have been enlarged, i.e., may be larger, relative to other features of the exemplary devices actually made in accordance with the present application. In the drawings:
fig. 1 is a general flowchart of a bandwidth resource reservation method in a satellite network executed by a controller according to an embodiment of the present application.
Fig. 2 is a schematic flowchart illustrating a specific process of a method for reserving bandwidth resources in a satellite network, which is executed by a controller according to an embodiment of the present invention.
Fig. 3 is a schematic flowchart of a method for reserving bandwidth resources in a satellite network, which is performed by an entry node in an embodiment of the present application.
Fig. 4 is a schematic flowchart of a method for reserving bandwidth resources in a satellite network, which is performed by an intermediate node in an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a bandwidth resource reservation apparatus in a satellite network according to another embodiment of the present application.
Fig. 6 is a system architecture diagram of a method for reserving bandwidth resources in a satellite network according to an application example of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application.
Here, it should be further noted that, in order to avoid obscuring the present application with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not so relevant to the present application are omitted.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
With the rapid development of internet applications, the initial "best effort" working mode of the internet cannot meet the demands of people, and network communication puts higher requirements on the service capacity of the network, so that the concept of QoS and related technologies come into play. Qos (quality of service) is a short term for quality of service, and refers to a technique for a network to provide better service capability for specified network communication by using multiple basic technologies, which is a technique for reducing network delay and solving congestion.
Currently, QoS mainly provides three service models, namely Best-Effort service (Best-Effort service model), Integrated service (Integrated service model, abbreviated as Int-Serv), and Differentiated service (Differentiated service model, abbreviated as Diff-Serv). Best-Effort is a default service type of the Internet, an application can send any number of messages at any time, and the network adopts a first-in first-out (FIFO) queue to send the messages as much as possible, and does not provide any guarantee on the performances such as bandwidth, time delay, reliability and the like, so that the Best-Effort service does not belong to the QoS category substantially.
Int-Serv is a comprehensive service model, can provide two kinds of services of guarantee service and load control, guarantee the bandwidth and time delay that the service provides and guarantees; the load control service ensures that similar services as if not overloaded can still be provided in the event of a network overload. The model adopts resource reservation protocol (RSVP), the application program needing QoS service firstly informs the network of the own flow parameter and the service quality requirement, so that the routing nodes from the source end to the destination end reserve the corresponding resources, and the application can send the message after confirming that the network reserves the resources for the message of the application program. The mode reserves resources on a path for each network service flow in advance, provides fine-grained service quality differentiation for the network, but when the number of application flows in the network is too large and the network data flow is too large, network equipment bears huge storage and processing pressure, and the QoS service is difficult to provide for each flow.
Diff-Serv is a multi-service model, unlike Int-Serv, Diff-Serv does not need to use RSVP signaling, and is a class-based QoS technology, mainly comprising traffic classification and marking, congestion management and congestion avoidance, traffic supervision, and other technologies. At the edge of the network, the network equipment checks the content of a flow data packet entering the network, the data packet is classified and marked into different and limited action sets, each set has a unique DS coding point identifier, and different forwarding strategies are adopted in the core network according to the identifiers to provide differential services for the data packet. Differentiated services do not need to store flow state and signaling information, and have better expandability compared with Int-Serv, but are difficult to provide service guarantee for end-to-end quality based on flows.
The specific technologies of QoS mainly include traffic classification and marking, congestion management, congestion avoidance, traffic supervision, traffic shaping, and the like. The traffic classification and marking generally divides the traffic into a plurality of priorities or service classes according to CoS domain of Ethernet frame, first three bits of ToS domain of IP header, first six bits of DSCP domain and EXP domain of MPLS, so that the system or equipment for processing message can process the message according to convention; the congestion management technology is to adopt a queue technology for management and control when congestion occurs, to put messages sent from the same port into a plurality of queues for waiting and send the messages according to queue priorities, wherein common queue technologies comprise FIFO, PQ, CQ, WFQ, CBQ, RTP priority queues and the like; the congestion avoidance is a technology for avoiding TCP global synchronization caused by discarding messages after a queue exceeds a specified length, and messages can be randomly discarded before congestion occurs through weighted random early detection WRED; traffic policing CAR and traffic shaping GTS techniques both control traffic through token bucket techniques.
The existing Diff-Serv service model divides different service requests into a limited number of service classes, provides service for the whole aggregated flow in a mode of aggregating service flows with the same characteristics, is not oriented to a single service flow any more, and does not maintain the forwarding state of each application program flow or each user, so that the quality guarantee is difficult to be provided for specific service flows, and the strict resource reservation and service quality guarantee cannot be realized.
Although the existing Int-Serv service model can maintain the forwarding state of each service flow or user independently, when the number of data flows is large, the equipment faces huge storage and processing pressure, and the expandability is poor; in addition, because the routing of the satellite network is constantly changed due to the high-speed movement of the satellites in the satellite network, the dynamic change of the topology and the continuous change of the relative positions among the satellites, if the Int-Serv service model is still used for providing the QoS service, the RSVP signaling is frequently used for performing global resource reservation configuration, and the configuration cost is too high, so the RSVP technology is not suitable for providing quality assurance service in the high-dynamic satellite network.
The method is based on the segmented routing and global entry speed limit on the basis of the Diff-Serv service model, ensures that the service with the resource reservation requirement can obtain the appointed service quality guarantee, and realizes resource reservation and independent maintenance of the high-priority service or the service requiring resource reservation while not needing frequent resource reservation configuration.
Based on this, an embodiment of the present application provides a method for reserving bandwidth resources in a satellite network, which may be executed by a controller, and referring to fig. 1, the method for reserving bandwidth resources in a satellite network, which may be executed by a controller, specifically includes the following contents:
step 100: and determining a target path of the target service in the satellite network according to the resource reservation parameters corresponding to the target service, topology data of the satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link.
In step 100, the resource reservation parameters may include a start point and an end point of end-to-end resource reservation, a required bandwidth, and so on.
Step 200: and sending the target path to an entrance node of the satellite network in a sectional routing SR label stack mode, so that the entrance 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 preferentially forwards the data packet in the satellite network.
It can be understood that when the control plane issues the path to the data plane node, the control plane will issue the path to the access satellite of the user in the future period of time, and calculate the path in all topology snapshot states in the user access period for each access satellite.
As can be seen from the above description, the bandwidth resource reservation method in the satellite network, which can be executed by the controller, provided by the embodiments of the present application, relies on the Diff-Serv service model, on the basis that the controller maintains the global bandwidth resource data, an end-to-end path passed by the service is designated through a segment routing SR (segment routing), the whole network service planning is carried out by combining the highest priority forwarding and entrance speed limiting capabilities, the resource reservation can be carried out on the service with the resource reservation requirement in the whole network range of the satellite network, the service with the resource reservation requirement can be ensured to obtain the designated service quality guarantee, the method can reserve and maintain resources for high-priority services or services needing resource reservation while not needing to frequently reserve and configure resources, and further can effectively improve the reliability and stability of service flow processing in the satellite network.
In order to effectively improve the operational reliability and stability of the bandwidth resource reservation process in the satellite network, in the method for reserving the bandwidth resource in the satellite network, which may be executed by the controller according to the embodiment of the present application, referring to fig. 2, the following content is specifically included after step 200 in the method for reserving the bandwidth resource in the satellite network, which may be executed by the controller:
step 300: and determining paths in all topology snapshot states in a user access time period aiming at each access satellite node corresponding to the target path.
Step 400: and deleting the available bandwidth on the paths in all the topology snapshot states from the available bandwidth resource data.
Step 500: and if the data packet is processed in the satellite network, releasing the resources occupied by the target path, and recovering the available bandwidth on the path in all the topology snapshot states in the available bandwidth resource data.
It can be understood that, after the path is issued, the controller may 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 reduction is time-sliced, i.e., only the time when the traffic passes through the designated path, the corresponding bandwidth is reduced from the bandwidth view.
When the resource reservation service is finished, the control plane releases the related resource occupation and restores the bandwidth deducted for the service in the available resource view.
As can be seen from the above description, the method for reserving bandwidth resources in a satellite network, which is provided by the embodiment of the present application and can be executed by a controller, can effectively improve the operational reliability and stability of the process of reserving bandwidth resources in the satellite network by updating the global view in time and releasing the service in time after the service stream processing is finished, and further can further improve the reliability and effectiveness of the service stream processing in the satellite network.
In order to improve reliability, convenience and efficiency of determining a target path of the target service in the satellite network according to topology information and available bandwidth resource data, in the method for reserving bandwidth resources in the satellite network, which can be executed by a controller, provided by the embodiment of the application, the topology data is a global topology view; the available bandwidth resource data is an available bandwidth resource view; referring to fig. 2, step 100 of the method for reserving bandwidth resources in a satellite network, which may be executed by a controller, further includes the following steps:
step 010: and periodically acquiring topology information and link state information of the satellite network according to ephemeris and real-time detection data corresponding to the satellite network.
Step 020: and updating the connection state 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 state information so as to respectively update the global topology view of the satellite network and the time-interval available bandwidth resource view corresponding to each link.
It is understood that the controller of the satellite network collects topology information and link state information of the entire satellite network through ephemeris and real-time sounding. And maintaining the connection state of the satellite in the current network through the inter-satellite link and the maximum available bandwidth view of each link. And acquiring the available bandwidth view of the whole network according to the resource allocation condition maintained by the control plane locally.
Wherein the available bandwidth resource view is time-sliced.
As can be seen from the above description, in the bandwidth resource reservation method in a satellite network that may be executed by a controller according to the embodiment of the present application, the connection state of each satellite through an inter-satellite link and the maximum available bandwidth data of each link in the current satellite network are updated based on the topology information and the link state information, so as to update the global topology view of the satellite network and the available bandwidth resource view of each link in different time periods, which may effectively improve reliability, convenience, and efficiency of determining a target path of the target service in the satellite network according to the topology information and the available bandwidth resource data, and may further improve efficiency and reliability of a bandwidth resource reservation process in the satellite network.
In order to further improve the efficiency of the service flow processing process in the satellite network and the planning rationality, in the method for reserving bandwidth resources in the satellite network, which may be executed by the controller according to the embodiment of the present application, referring to fig. 2, step 100 in the method for reserving bandwidth resources in the satellite network, which may be executed by the controller, specifically includes the following contents:
step 110: a target traffic handling request for a Diff-Serv service model based satellite network is received.
Step 120: and if the target service processing request is determined to have the resource reservation requirement, acquiring the resource reservation parameter of the target service processing request.
Step 130: and determining a target path of the target service processing request by using a shortest path algorithm according to the resource reservation parameters, a preset global topology view of the satellite network and available bandwidth resource views corresponding to all links.
It can be understood that when there is a resource reservation requirement for a new service, the control plane is informed of two parameters, namely the start point and the end point of end-to-end resource reservation and the required bandwidth, through the service plane.
Under the global topology view and the available resource view, an end-to-end path which can meet the bandwidth reservation requirement of the residual bandwidth resources under the current topology is calculated by combining the end-to-end resource reservation requirement of the service and utilizing a shortest path algorithm or other path calculation algorithms. If the path meeting the bandwidth requirement can be found, the resource reservation service is allowed to be accessed, and if the path meeting the bandwidth reservation requirement cannot be found, the resource reservation request of the service is refused.
As can be seen from the above description, the method for reserving bandwidth resources in a satellite network, which can be executed by a controller according to the embodiment of the present application, determines a target path of the target service processing request by using a shortest path algorithm, and can further improve efficiency and planning rationality of a service flow processing process in the satellite network on the basis of ensuring that a service with a resource reservation requirement obtains a specified service quality.
The embodiment of the present application further provides a method for reserving bandwidth resources in a satellite network, which may be executed by an entry node in the satellite network, and referring to fig. 3, the method for reserving bandwidth resources in a satellite network, which may be executed by an entry node, specifically includes the following contents:
step 610: receiving a target path of a target service sent by a controller in a form of a Segment Routing (SR) label stack, and receiving a data packet of the target service from a client device, wherein the target path is determined by the controller in advance according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model, and available bandwidth resource data corresponding to preset links.
Step 620: marking the data packet of the target service with the highest forwarding priority and adding the data packet into an absolute forwarding queue to wait for a port to forward the data packet to an intermediate node in the satellite network.
Step 630: and limiting the speed of the data packet according to the bandwidth reserved for the target service, and performing label stack pressing on the data packet so as to press the target path of the data packet into the head of the data packet in a label stack manner.
It is understood that step 610 is performed after step 200.
As can be seen from the above description, the bandwidth resource reservation method in a satellite network, which can be performed by an ingress node in the satellite network, provided by the embodiments of the present application, relies on a Diff-Serv service model, on the basis that the controller maintains global bandwidth resource data, an end-to-end path passed by a service is specified through a segmented routing SR, an entrance node combines the capabilities of highest priority forwarding and entrance speed limiting, and combines an intermediate node to carry out whole-network service planning, so that resource reservation for the service with resource reservation requirements in the whole-network range of a satellite network can be realized, the service with the resource reservation requirements can be ensured to obtain specified service quality assurance, the method can reserve and maintain resources for high-priority services or services needing resource reservation while not needing to frequently reserve and configure resources, and further can effectively improve the reliability and stability of service flow processing in the satellite network.
The embodiment of the present application further provides a method for reserving bandwidth resources in a satellite network, which may be executed by an intermediate node in the satellite network, and referring to fig. 4, the method for reserving bandwidth resources in a satellite network, which may be executed by an intermediate node, specifically includes the following contents:
step 710: and receiving a data packet of the target service forwarded by an entrance node in the satellite network, and identifying the forwarding priority of the data packet.
Step 710: and placing the data packet in an absolute forwarding queue of a next hop forwarding port of a corresponding target path according to information carried by the head of the data packet for port forwarding, wherein the target path is determined in advance by a controller according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link, and then sending the data packet to the entry node by the controller in the form of a segment routing SR label stack.
It is understood that step 710 is performed after step 630.
As can be seen from the above description, the bandwidth resource reservation method in a satellite network, which can be performed by an intermediate node in the satellite network, provided by the embodiments of the present application, relies on a Diff-Serv service model, on the basis that the controller maintains the global bandwidth resource data, an end-to-end path passed by the service is designated through a segment routing SR (segment routing), the entrance node combines the capability of the highest priority forwarding and entrance speed limiting, and combines the intermediate node to plan the whole network service, so that the resource reservation for the service with the resource reservation requirement in the whole network range of the satellite network can be realized, the service with the resource reservation requirement can be ensured to obtain the designated service quality guarantee, the method can reserve and maintain resources for high-priority services or services needing resource reservation while not needing to frequently reserve and configure resources, and further can effectively improve the reliability and stability of service flow processing in the satellite network.
From a software aspect, the present application further provides a device for reserving bandwidth resources in a satellite network, for performing all or part of the foregoing method for reserving bandwidth resources in a satellite network, which may be controlled by a controller, and referring to fig. 5, the device for reserving bandwidth resources in a satellite network specifically includes the following contents:
the available bandwidth resource application module 10 is configured to determine a target path of the target service in the satellite network according to a resource reservation parameter corresponding to the target service, topology data of the satellite network based on a Diff-Serv service model, and available bandwidth resource data corresponding to preset links.
And the segment routing issuing module 20 is configured to send the target path to an entry node of the satellite network in a segment routing SR label stack manner, so that the entry node that receives 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.
The embodiment of the device for reserving bandwidth resources in a satellite network provided by the present application may be specifically configured to execute the processing procedure of the embodiment of the method for reserving bandwidth resources in a satellite network that may be controlled by a controller in the foregoing embodiment, and its function is not described herein again, and reference may be made to the detailed description of the embodiment of the method for reserving bandwidth resources in a satellite network that may be controlled by a controller. In addition, the bandwidth resource reservation device in the satellite network may be configured to perform the functions of the intermediate node or the entry node.
The part of the bandwidth resource reservation means in the satellite network that performs bandwidth resource reservation in the satellite network may be performed in a server, and in another practical application scenario, all operations may be performed in a client device. The selection may be specifically performed according to the processing capability of the client device, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. If all the operations are completed in the client device, the client device may further include a processor for performing specific processing of bandwidth resource reservation in the satellite network.
The client device may have a communication module (i.e., a communication unit), and may be communicatively connected to a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, the server may also include a server on an intermediate platform, for example, a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed apparatus.
The server and the client device may communicate using any suitable network protocol, including a network protocol that has not been developed at the filing date of the present application. The network protocol may include, for example, a TCP/IP protocol, a UDP/IP protocol, an HTTP protocol, an HTTPS protocol, or the like. Of course, the network Protocol may also include, for example, an RPC Protocol (Remote Procedure Call Protocol), a REST Protocol (Representational State Transfer Protocol), and the like used above the above Protocol.
As can be seen from the above description, the bandwidth resource reservation apparatus in a satellite network provided in the embodiment of the present application, based on a Diff-Serv service model, performs a whole network service planning by specifying an end-to-end path through which a service passes through by a segment routing SR on the basis that a controller maintains global bandwidth resource data, and combining the highest priority forwarding and entry speed limiting capabilities, can perform resource reservation for services requiring resource reservation in the whole network range of the satellite network, can ensure that the services requiring resource reservation obtain specified service quality guarantee, and can perform resource reservation and individual maintenance for high priority services or services requiring resource reservation while not requiring frequent resource reservation configuration, thereby effectively improving reliability and stability of service flow processing in the satellite network.
Based on the foregoing embodiments, the present application further provides a system for reserving bandwidth resources in a satellite network, which specifically includes the following contents:
a controller and each satellite node constituting a satellite network; each of the satellite nodes includes: an ingress node and various intermediate nodes.
The controller is used for implementing a bandwidth resource reservation method in the satellite network shown in fig. 1 or fig. 2.
The entry node is used to implement the bandwidth resource reservation method in the satellite network shown in fig. 3.
The intermediate node is used for implementing a bandwidth resource reservation method in the satellite network shown in fig. 4.
In order to further explain the scheme, the application also provides a specific application example of the bandwidth resource reservation method in the satellite network. Based on a Diff-Serv service model, on the basis that a controller maintains a global bandwidth resource view, an end-to-end path passed by a service is designated through a Segment Routing (SR), and the whole network service planning is carried out by combining the highest priority forwarding and entrance speed limiting capacity, so that the resource reservation for a specific service in the whole network range of a satellite network is realized.
The main steps of resource reservation are divided into control plane and data plane sides. On the control surface side, the processing flow comprises global view acquisition and maintenance, service resource reservation request arrival, path planning and admission control, path issuing, global view updating and the like. On the data plane side, the processing flow comprises priority mapping, bandwidth speed limiting, label stack pressing, intermediate node processing and the like. Referring to fig. 6, the method for reserving bandwidth resources in a satellite network specifically includes the following steps:
control plane
1. Global view acquisition and maintenance
And a controller of the satellite network collects topology information and link state information of the whole satellite network through ephemeris and real-time detection. And maintaining the connection state of the satellite in the current network through the inter-satellite link and the maximum available bandwidth view of each link. And acquiring the available bandwidth view of the whole network according to the resource allocation condition maintained by the control plane locally.
Note that the available bandwidth resource view is time-sliced, and its format is shown in table 1.
TABLE 1
2. Requesting reserved resources after service arrival
When a new service has a resource reservation requirement, the service plane informs the control plane of two parameters of a starting point and an end point of end-to-end resource reservation and a required bandwidth.
3. Path planning and admission control
Under the global topology view and the available resource view, an end-to-end path which can meet the bandwidth reservation requirement of the residual bandwidth resources under the current topology is calculated by combining the end-to-end resource reservation requirement of the service and utilizing a shortest path algorithm or other path calculation algorithms. If the path meeting the bandwidth requirement can be found, the resource reservation service is allowed to be accessed, and if the path meeting the bandwidth reservation requirement cannot be found, the resource reservation request of the service is refused.
4. Path issuing
And the control plane issues the calculated end-to-end path to an entry node of the data plane service in a sectional routing SR label stack mode. When the control plane issues the path to the data plane node, the control plane will issue the path to the access satellite of the user in the future period of time respectively, and calculate the path in all topology snapshot states in the user access period for each access satellite.
5. Global view update
After the path is issued, the controller deducts 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 reduction is time-phased, that is, only when the traffic passes through the specified path, the corresponding bandwidth is reduced from the bandwidth view.
6. Service release
When the resource reservation service is finished, the control plane releases the related 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, and the processing logic of the data plane is specifically as follows:
(II) data plane
1. Priority mapping
The data plane maintains several queues per satellite node at each port. Among them, there is a queue that adopts the priority of absolute forwarding, which is called an absolute forwarding queue. That is, whenever there is a packet in the queue, the port will forward the packet in the queue first, and until all packets in the queue are successfully forwarded, the port will not forward the packets in other queues further.
When the data plane satellite node equipment is reached, the satellite node equipment marks the highest forwarding priority on the data packet with the bandwidth reservation requirement, then places the data packet in an absolute forwarding queue, and forwards the data packet out of a port.
2. Bandwidth rate limiting
When a specific service flow is sent to an access satellite node from a user terminal, the node limits the speed of the access service flow, and the numerical value of the speed limit is the bandwidth reserved by the service.
3. Label stacking and data packet forwarding
The data plane satellite node performs label stack on the service data packet, and pushes a path to be traveled by the data packet to the header of the data packet in a form of label stack, as shown in fig. 6.
4. Intermediate node processing
After a data packet of a service is forwarded to an intermediate node through a service entry node, the intermediate node identifies the priority of the data packet, identifies the priority as the highest forwarding priority, and places the data packet in an absolute forwarding queue of a next hop forwarding port in combination with tag information carried by the head of the data packet.
Through the steps, the resource reservation in the satellite network bearing network can be completed.
Of particular note are:
each service has an access priority. The access priority refers to the sequential priority in which resource reservation requests are accessed by the network when a plurality of resource reservation requests simultaneously exist at the network entrance. And when the calculated bandwidth of each link of the path fails to meet the service request resource, the controller judges the access priority of the service and processes the service. The access priority of the service is agreed with the operator in advance before it runs the service. The new service with high access priority can occupy the transmission bandwidth of the service with low access priority. When there are many services already in the network and bandwidth resources are largely under-occupied to provide 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 the present application provides a resource reservation method combining SR and differentiated services in a satellite network; a queue scheduling mode for absolute forwarding with the highest priority in a differentiated service model is provided; the method is provided for carrying out bandwidth speed limitation on the highest priority service in a differentiated service model and realizing global bandwidth resource planning through SR explicit path planning; the resource reservation scheme based on the SR can realize high-efficiency simple configuration under the dynamic environment of the satellite network; a flow mode that a controller in a satellite SR network maintains and updates a global resource view is provided, and a calculation basis is provided for resource reservation service; the combined working mode of the access priority and the forwarding priority is designed, and a further resource reservation scheme can be provided on the basis of providing the resource reservation service. The innovation of the application embodies that the resource reservation is realized by adopting a Diff-Serv differentiated service model. And setting priority forwarding for the service. The service with resource reservation requirement in the aspects of bandwidth and the like can be set as the absolute forwarding priority, the speed of the service entrance is limited, and the resource reservation under Diff-Serv can be realized by combining the display path planning and the global resource view brought by SR. In addition, for the access point with frequent change of the satellite network, the SR mechanism is adopted, so that a large amount of reconfiguration is not needed, and only the configuration is needed at a service entrance, thereby avoiding a large amount of reconfiguration cost.
The present application further provides a computer device (i.e., an electronic device), where the computer device may include a processor, a memory, a receiver, and a transmitter, where the processor is configured to execute the method for reserving bandwidth resources in a satellite network executed by any of the execution bodies mentioned in the foregoing embodiments, where the processor and the memory may be connected by a bus or in another manner, for example, connected by a bus. The receiver can be connected with the processor and the memory in a wired or wireless mode. The computer equipment is in communication connection with a bandwidth resource reservation device in the satellite network to receive real-time motion data from sensors in the wireless multimedia sensor network and to receive an original video sequence from the video acquisition device.
The processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the method for reserving bandwidth resources in a satellite network, which is performed by any of the executing entities in the embodiments of the present application. The processor executes the non-transitory software program, instructions and modules stored in the memory, so as to execute various functional applications and data processing of the processor, that is, implement the bandwidth resource reservation method in the satellite network in the above method embodiment.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one 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 such remote memory may be coupled to the processor via a network. Examples of such 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, perform a method for bandwidth resource reservation in a satellite network performed by any of the execution bodies in the embodiments.
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, the memory, the receiver, and the transmitter may be connected by a bus system, the memory is configured to store computer instructions, and the processor is configured to execute the computer instructions stored in the memory to control the transceiver unit to transceive signals.
As an implementation manner, the functions of the receiver and the transmitter in this application may be considered to be implemented by a transceiving circuit or a transceiving dedicated chip, and the processor may be considered to be implemented by a dedicated processing chip, a processing circuit or a general-purpose chip.
As another implementation manner, a manner of using a general-purpose computer to implement the server provided in the embodiment of the present application may be considered. That is, program code that implements the functions of the processor, receiver, and transmitter is stored in the memory, and a general-purpose processor implements the functions of the processor, receiver, and transmitter by executing the code in the memory.
Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the bandwidth resource reservation method in a satellite network executed by any of the foregoing executing bodies. 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, registers, floppy disks, hard disks, removable storage disks, CD-ROMs, or any other form of storage medium known in the art.
Those of ordinary skill in the art will appreciate that the various illustrative components, systems, and methods described in connection with the embodiments disclosed herein may be implemented as hardware, software, or combinations of both. Whether this is done in hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the embodiment of the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for reserving bandwidth resources in a satellite network, comprising:
determining a target path of a target service in a satellite network according to resource reservation parameters corresponding to the target service, topological data of the satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link;
and sending the target path to an entrance node of the satellite network in a sectional routing SR label stack mode, so that the entrance 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 preferentially forwards the data packet in the satellite network.
2. The method of reserving bandwidth resources in a satellite network as claimed in claim 1, further comprising:
determining paths in all topology snapshot states in a user access time period aiming at each access satellite node corresponding to the target path;
deleting available bandwidth on paths in all topology snapshot states from the available bandwidth resource data;
and if the data packet is processed in the satellite network, releasing the resources occupied by the target path, and recovering the available bandwidth on the path in all the topology snapshot states in the available bandwidth resource data.
3. The method of claim 1, wherein the topology data is a global topology view; the available bandwidth resource data is an available bandwidth resource view;
correspondingly, the method for reserving bandwidth resources in the satellite network further comprises the following steps:
periodically acquiring topology information and link state information of the satellite network according to ephemeris and real-time detection data corresponding to the satellite network;
and updating the connection state 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 state information so as to respectively update the global topology view of the satellite network and the time-interval available bandwidth resource view corresponding to each link.
4. The method as claimed in claim 3, wherein the determining the target path of the target service in the satellite network according to the resource reservation parameter corresponding to the target service, the topology data of the satellite network, and the available bandwidth resource data corresponding to each preset link comprises:
receiving a target service processing request aiming at a satellite network based on a Diff-Serv service model;
if the target service processing request is determined to have the resource reservation requirement, acquiring a resource reservation parameter of the target service processing request;
and determining a target path of the target service processing request by using a shortest path algorithm according to the resource reservation parameters, a preset global topology view of the satellite network and available bandwidth resource views corresponding to all links.
5. A method for reserving bandwidth resources in a satellite network, comprising:
receiving a target path of a target service sent by a controller in a form of a Segment Routing (SR) label stack, and receiving a data packet of the target service from a client device, wherein the target path is determined by the controller in advance according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model and available bandwidth resource data corresponding to preset links;
marking the highest forwarding priority on the data packet of the target service and adding the data packet into an absolute forwarding queue to be forwarded to an intermediate node in the satellite network by a port;
and limiting the speed of the data packet according to the bandwidth reserved for the target service, and performing label stack pushing on the data packet so as to press the target path of the data packet into the head of the data packet in a label stack manner.
6. A method for reserving bandwidth resources in a satellite network, comprising:
receiving a data packet of a target service forwarded by an entrance node in a satellite network, and identifying the forwarding priority of the data packet;
and placing the data packet in an absolute forwarding queue of a next hop forwarding port of a corresponding target path according to information carried by the head of the data packet for port forwarding, wherein the target path is determined in advance by a controller according to resource reservation parameters corresponding to the target service, topology data of a satellite network based on a Diff-Serv service model and preset available bandwidth resource data corresponding to each link, and then sending the data packet to the entry node by the controller in the form of a segment routing SR label stack.
7. A device for reserving bandwidth resources in a satellite network, comprising:
the available bandwidth resource application module is used for determining a target path of the target service in the satellite network according to resource reservation parameters corresponding to the target service, topology data of the satellite network based on a Diff-Serv service model and available bandwidth resource data corresponding to preset links;
and the segmented route issuing module is used for sending the target path to an entrance node of the satellite network in a segmented route SR label stack mode so as to enable the entrance node receiving the data packet of the target service to limit the speed of the data packet according to the bandwidth reserved for the target service and to preferentially forward the data packet in the satellite network.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method for reservation of bandwidth resources in a satellite network according to any of claims 1 to 4, the method for reservation of bandwidth resources in a satellite network according to claim 5 or the method for reservation of bandwidth resources in a satellite network according to claim 6 when executing the computer program.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for reserving bandwidth resources in a satellite network according to any one of claims 1 to 4, 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 system for reserving bandwidth resources in a satellite network, comprising: a controller and each satellite node constituting a satellite network; each of the satellite nodes includes: an ingress node and each intermediate node;
the controller is used for implementing the bandwidth resource reservation method in the satellite network of any claim 1 to 4;
the entry node is configured to implement the method for reserving bandwidth resources in a satellite network according to claim 5;
the intermediate node is configured to implement the method for reserving bandwidth resources in a satellite network as claimed in claim 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115361335A (en) * | 2022-07-13 | 2022-11-18 | 鹏城实验室 | SR-MPLS-based dynamic routing method for low-orbit satellite network |
| CN115226152A (en) * | 2022-07-21 | 2022-10-21 | 广州爱浦路网络技术有限公司 | Satellite network communication method, system, electronic equipment and storage medium |
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