A method and system for constructing a satellite-based integrated X-band communication network based on SIP technology

Abstract

The present invention discloses a method and system for constructing a satellite-based integrated X-band communication network based on SIP technology, which belongs to the field of network communication. The method includes: constructing an underlying link, using the X-band as the transmission medium of the physical layer, and communicating between the satellite and the ground station through the X-band frequency; connecting the network layer protocol with the X-band communication link, and having a ground SIP proxy server built in the ground receiving end for managing the SIP protocol docking with the satellite, supporting signal scheduling, resource allocation and status monitoring; combining link quality data with a routing forwarding strategy to realize dynamic routing forwarding rule selection based on link quality; configuring the IP routing forwarding rules of the satellite-to-ground link and the inter-satellite link according to the link interconnection and routing forwarding strategy, and constructing a communication network integrating the earth and the sky. The present invention realizes dynamic bandwidth allocation by adding a link quality monitoring function to the SIP protocol stack.

Description

Technical Field

[0001] The present invention relates to the field of network communication, and in particular to a method and system for constructing a satellite-borne integrated X-band communication network based on SIP technology. Background Art

[0002] Integrated satellite communication networks usually involve high-speed data transmission between multiple satellites and ground stations. Although this technology has strong advantages in theory, it still faces many challenges in practical applications. As a physical layer transmission medium, the propagation characteristics of the X-band are very sensitive to weather phenomena such as the atmosphere, clouds, and precipitation, and are prone to problems such as signal fading, delay fluctuations, and link instability. This will seriously affect the quality of communication, especially under complex environmental conditions such as bad weather and terrain obstruction. In addition, existing satellite communication networks have major problems in resource scheduling and bandwidth management. Especially in a dynamic environment, how to adjust the bandwidth in real time to adapt to changes in link quality is still a difficult problem to be solved. Traditional network management strategies are usually static and cannot respond quickly to changes in links, resulting in bandwidth waste or link congestion. In existing integrated satellite communication networks, different protocol stacks need to be followed between devices, including satellite link layer, network layer, transport layer, etc. However, due to the compatibility issues of protocol stacks at different levels, the complexity of the communication system increases, and the stability and maintainability of the system are affected. Existing technologies generally have limitations in link quality monitoring and adjustment. Although some basic network indicators (such as signal strength, latency, etc.) can be monitored, the lack of real-time and comprehensive link quality data support makes it difficult for the system to dynamically adjust resource allocation and make effective optimizations when links change.

[0003] Although SIP (Session Initiation Protocol) technology has been widely used in the field of communications, especially in voice, video communications and instant messaging, its application in satellite-based integrated communication networks still faces many challenges. First, the SIP protocol is very sensitive to latency, especially in satellite communications. Due to the long distance between satellites and ground stations, bandwidth delay and latency jitter will directly affect the performance of the SIP protocol. Especially in real-time communication scenarios, the SIP protocol requires low latency and low jitter, but satellite links often cannot provide stable low-latency services. One of the advantages of the SIP protocol is that it can dynamically adjust session parameters, such as bandwidth allocation, according to the link status. However, in satellite-based integrated communication networks, due to the volatility of link quality and the latency between ground stations and satellites, the link quality monitoring and dynamic adjustment functions of the SIP protocol are difficult to achieve. In addition, the SIP protocol requires seamless collaboration between satellites, ground stations and terminal devices. Although the SIP protocol is widely used in terrestrial communications, in satellite-based systems, how to effectively integrate the SIP protocol stack has become a technical difficulty due to differences in equipment, protocol stacks, communication links, etc. Summary of the invention

[0004] One of the purposes of the present invention is to provide a method for constructing a satellite-based integrated X-band communication network based on SIP technology, so as to solve the shortcomings of the prior art that the differences in equipment, protocol stacks, and communication links make it difficult to effectively integrate the SIP protocol stack.

[0005] The present invention is implemented through the following technical scheme, a method for constructing a satellite-based integrated X-band communication network based on SIP technology, comprising the following steps: S100, constructing an underlying link, using the X-band as a transmission medium of the physical layer, communicating between the satellite and the ground station through the X-band frequency, and using the satellite transceiver as a physical layer device to complete the basic data transmission between the satellite and the ground station; S200, connecting the network layer protocol with the X-band communication link, and having a ground SIP proxy server built in the ground receiving end to manage the SIP protocol docking with the satellite, support signal scheduling, resource allocation and status monitoring, and manage user requests according to the SIP protocol, process call requests, session establishment and termination, and at the same time through the X-band satellite The link provides communication transmission, and the SIP protocol stack is deployed in the ground station, satellite and terminal equipment at the same time. The devices can communicate through standard signaling and session management protocol. The SIP protocol stack can dynamically monitor the link quality data in real time according to environmental changes, and adjust the bandwidth according to the monitored link quality data, so as to achieve a stable connection of the protocol stack between the satellite and the ground station; S300, combining the link quality data described in step S200 with the routing forwarding strategy to achieve dynamic routing forwarding rule selection based on link quality; S400, according to the link interconnection in S200 and the routing forwarding strategy in S300, configure the IP routing forwarding rules of the satellite-to-ground link and the inter-satellite link to build a space-ground integrated communication network.

[0006] Furthermore, the communication module carried on the satellite is integrated with a SIP protocol stack, which is used to provide session management functions of the SIP protocol, control data flow, route selection and session maintenance, and the routing on the satellite is based on the call routing and address resolution mechanism in the SIP protocol to achieve flexible selection of communication paths.

[0007] Further, dynamically adjusting the bandwidth according to environmental changes includes: describing the rapid changes of the communication link caused by the high speed of the satellite in the low earth orbit environment by the following coupled differential equations:

[0008] ,

[0009] ,

[0010] ,

[0011] Among them, d(t) is used to represent the distance between the satellite and the ground station at time t; α(t) is used to represent the link quality; P(t) is used to represent the received power at time t; δ(t) is used to represent the additional attenuation caused by factors such as the atmosphere and clouds; γ is the path loss index, which takes a value of 2~4; v is the speed of the satellite; k1 and k2 are attenuation coefficients; P0 is the transmit power, μ is the standard gravitational parameter of the earth; r(t) is the position vector of the satellite, indicating the relative position of the satellite to the center of the earth; the signal quality of the entire communication process is evaluated according to the coupled differential equations, and the average received power P is calculated by time integrating the received power P(t) in a communication window. avg , the average received power P avg It can be expressed by the following integral formula:

[0012] The integral formula calculates the integral of the received power P(t) over the time interval [0,T] and then divides it by T to obtain an average value over time. The average value reflects the overall performance of the link quality and is used to evaluate the long-term stability and reliability of the network.

[0013] Furthermore, the parameters calculated by the coupled differential equations are used as real-time data of the satellite link, and the parameters are integrated into the resource scheduling system of the SIP protocol stack. The resource scheduling system of integrating the parameters into the SIP protocol stack includes the following sub-steps: S210, according to the link quality α(t), the receiving power P(t), the distance d(t) between the satellite and the ground station, and the satellite orbit, a mapping relationship between the link quality and the QoS indicator is established; S220, using P avg As the input of link quality assessment, the average received power of each link is calculated, and P is obtained according to the calculation avg The value of P selects the best path and route, giving priority to paths with high receiving power to ensure high-quality communication; and based on avg , the SIP protocol stack can dynamically adjust the QoS strategy, allocate bandwidth according to the priority of different services, and ensure that high-priority traffic is transmitted first; S230, take the parameters in the coupled differential equation group as input, and pass the input parameters as real-time data and feedback information to the network management module of the SIP protocol stack, and combine with P avg , which enables the SIP protocol stack to dynamically adjust the QoS policy and allocate bandwidth according to the priority of different services to ensure that high-priority traffic is transmitted first.

[0014] Furthermore, the mapping relationship between link quality and QoS indicators includes: delay(t) ∝ vd(t), which is used to indicate that the relative speed and distance between the satellite and the ground station will affect the transmission delay; bandwidth(t) ∝ α(t), which is used to indicate that the link quality is proportional to the available bandwidth.

[0015] Further, according to the calculation, P avg The value of selecting the best path and routing includes: when P avg When the value of is high, the SIP protocol stack dynamically increases the bandwidth and adopts an efficient modulation method; when P avg When the value of is low, the SIP protocol stack can reduce bandwidth, reduce traffic demand, use a stable modulation method to improve anti-interference, and increase the transmission power to improve link stability. avg If the value remains low for a long time, the SIP protocol stack triggers redundant link switching and performs dynamic path selection based on changes in link quality.

[0016] Furthermore, step S300 includes the following sub-steps: S310, evaluating the health of the link according to the output of the coupled differential equation system; S320, selecting the optimal forwarding path according to the evaluated link health status combined with the QoS indicator, and dynamically adjusting the transmission power according to the change of the received power P(t). When the link quality decreases, the power is increased to enhance the reliability of the signal. When the link quality is good, the power is reduced to save energy and reduce interference; S330, according to the real-time link quality and traffic demand, the data stream is distributed to multiple links, and redundant links are introduced in the routing configuration. When the α(t) or P(t) of the main link drops to the critical value, it automatically switches to the backup link to ensure uninterrupted communication.

[0017] Another aspect of the present invention provides a satellite-based integrated X-band communication network system based on SIP technology. The communication network system includes: a processor; a memory storing a computer program, and when the computer program is executed by the processor, the satellite-based integrated X-band communication network method based on SIP technology as described above is implemented.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. The present invention combines the SIP protocol stack with the X-band communication link, embeds a SIP proxy server in the ground station, and deploys the SIP protocol stack in the satellite, ground station, and terminal equipment, so as to ensure real-time link status exchange between devices through standard signaling protocols. This enables the SIP protocol to dynamically adjust the bandwidth when the link changes (such as weather changes, signal fading, etc.) to ensure the stability of communication. This enables real-time monitoring of link quality and dynamic adjustment of bandwidth.

[0020] 2. The present invention designs a coupled differential equation group in consideration of the rapid changes in the communication link caused by the high speed of the satellite in the low earth orbit environment. The coupled differential equation group further enhances the link optimization capability between the satellite and the ground station, which can effectively improve the dynamic adjustment of the link quality and reduce the degradation of communication quality caused by link instability. Through the accurate prediction and optimization of the link state by the coupled differential equation group, resources can be reallocated in time when the link changes, ensuring the communication quality of the SIP protocol.

[0021] 3. The present invention adds a link quality monitoring function to the SIP protocol stack, which can automatically detect link changes and make bandwidth adjustments, thus achieving dynamic bandwidth allocation, greatly improving bandwidth utilization efficiency and avoiding bandwidth waste or congestion problems caused by traditional static scheduling strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0023] Figure 1 This is a flow chart of the method provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Embodiment 1,

[0026] In this embodiment, a method for constructing a satellite-based integrated X-band communication network based on SIP technology is provided. This method constructs a satellite-based integrated X-band communication network based on SIP (Session Initiation Protocol) technology, and performs an overall design from the space link layer, network layer and application layer to ensure that the SIP protocol can run efficiently in the X-band satellite communication environment.

[0027] In this embodiment, the SIP protocol stack is integrated into the satellite's communication processing unit, so that the satellite can directly process SIP signaling and support the establishment, maintenance and termination of sessions. The communication payload is optimized to support high-performance transceivers in the X-band, ensuring high-bandwidth, low-latency communication capabilities within the X-band frequency range (8-12 GHz). At the same time, SIP-compatible terminals are configured in the ground station and user terminals, so that SIP sessions can be directly conducted with the satellite.

[0028] Most importantly, in this implementation, the SIP signaling is optimized for the high latency characteristics of satellite communications, so that the SIP protocol stack can dynamically adjust the allocation and priority of network services according to changes in link quality, thereby reducing the number of signaling messages, merging multiple interactions, and reducing session establishment time.

[0029] Figure 1 The flowchart of the method of this embodiment is shown. It can be seen from the figure that this embodiment is implemented through the following steps:

[0030] Step 1: In this embodiment, the X-band is used as the transmission medium of the physical layer, and the satellite and the ground receiving end communicate via the X-band frequency.

[0031] Satellite transceivers are physical layer devices used to complete basic data transmission for satellite-to-ground communications. X-band communication links must have high bandwidth and low latency to ensure communication quality.

[0032] Specifically, the satellite is equipped with a communication module that can use the X-band frequency band for data transmission. At the same time, the communication module is combined with a software radio module SDR (Software Defined Radio) that can flexibly configure the frequency band, modulation mode, etc. At the same time, the SIP protocol stack is integrated in the satellite's communication module to provide the SIP protocol session management function, control data flow, route selection, and session maintenance, etc. The routing on the satellite flexibly selects the communication path based on the call routing and address resolution mechanism in the SIP protocol.

[0033] Step 2: Connect the network layer protocol (such as TCP / IP) with the physical layer link (such as the X-band communication link) to achieve effective data transmission and reliable protocol interaction. In this embodiment, the connection of the protocol stack (for example, the connection of the TCP / IP and SIP protocol stacks) is the basis for ensuring that the communication link can transmit data. In the satellite equipment and the ground station equipment, the connection between the TCP / IP protocol stack and the underlying link is realized through the driver. This step realizes the connection between the physical layer and the network layer, so that the satellite system can exchange data through the IP protocol.

[0034] Specifically, a ground SIP proxy server is built into the ground receiving end to manage the SIP protocol docking with the satellite and support signal scheduling, resource allocation and status monitoring. At the same time, user requests are managed according to the SIP protocol, and call requests, session establishment and termination are processed. In the satellite-to-ground link in this embodiment, SIP signaling needs to be transmitted through the standard IP protocol to ensure the reliability and real-time performance of the signaling. At the same time, communication transmission is provided through the X-band satellite link. The link needs to support data transmission of the SIP protocol, and the SIP protocol stack is deployed in the ground station, satellite and terminal equipment to ensure that these devices can communicate through standard signaling and session management protocols.

[0035] Considering the low-Earth orbit environment, the high speed of the satellite will cause rapid changes in the communication link, and factors such as signal attenuation, path loss and interference will change dynamically over time.

[0036] Generally, the change of communication link quality depends not only on distance and speed, but also on multiple factors such as communication delay, atmospheric attenuation, relative motion of satellite and ground station, etc. Therefore, in order to enable the connection of protocol stack to dynamically adjust bandwidth according to environmental changes, a stable connection of protocol stack between satellite and ground station can be achieved.

[0037] In this embodiment, these time-varying dynamic systems are described by the following coupled differential equations:

[0038]

[0039] By solving this set of coupled differential equations, the long-term or cumulative impact of the system is considered through integration. Specifically, it includes the following:

[0040] First, in order to describe the dynamic changes of the link between the satellite and the ground station, the following core variables need to be introduced:

[0041] d(t) is used to represent the distance between the satellite and the ground station at time t.

[0042] α(t) is used to represent the link quality.

[0043] P(t) is used to represent the received power at time t.

[0044] δ(t) is used to represent the additional attenuation caused by meteorological factors.

[0045] Then, considering that the distance d(t) between the satellite and the ground station changes rapidly, the path loss can be modeled as a time-dependent process. Path loss is usually a key factor in signal propagation and depends on distance and frequency, so the first differential equation can be obtained:

[0046] ,

[0047] Among them, γ is the path loss index, which usually takes a value between 2 and 4; v is the speed of the satellite; k1 and k2 are attenuation coefficients, which depend on factors such as frequency, environment and weather. This equation describes the change of link quality α(t) over time.

[0048] , reflects the effect of propagation loss, while It reflects the influence of the relative speed between the satellite and the ground station. The relative speed v will cause the Doppler effect, thereby affecting the signal reception quality.

[0049] The second differential equation is used to express the relationship between link quality and received power:

[0050] ,

[0051] Among them, P0 is the transmission power, α(t) is the path loss factor, d(t) is the distance, and δ(t) is the attenuation caused by factors such as the atmosphere. The received power P(t) is affected by the link quality α(t) and the distance d(t) between the satellite and the ground station.

[0052] This term represents the relationship between received power and link quality and propagation loss. Since the signal will attenuate during propagation, the square of the distance determines the power attenuation law. This term is often used to represent the loss or attenuation of other factors in the signal, such as signal loss due to atmospheric absorption, interference, noise, etc.

[0053] Finally, due to the high-speed motion of the satellite, the link status changes rapidly. The satellite runs at a speed of nearly 7.5 km / s in a low orbit, which causes the distance d(t) to change over time. The satellite's orbit is usually approximately elliptical, so the change of the satellite's position r(t) over time needs to be modeled by orbital dynamics. We can use the third differential equation to describe the change in satellite position:

[0054] ,

[0055] Among them, μ is the standard gravitational parameter of the earth, and r(t) is the position vector of the satellite, which represents the relative position of the satellite and the center of the earth. Through this equation, we can get the position and speed of the satellite in orbit, and thus calculate the distance between the satellite and the ground station.

[0056] The above three equations form a coupled differential equation system through the interdependence of time and physical quantities. In this coupled differential equation system, the first equation describes the change of link quality through the distance d(t) and relative speed v between the satellite and the ground station. The link quality α(t) affects the received power P(t) in the second equation. The received power P(t) in the second equation is affected by the link quality α(t) and the distance d(t). The third equation describes the orbital motion of the satellite relative to the ground station, which affects the changes of d(t) and α(t).

[0057] By coupling these equations, the entire system can dynamically describe the relationship between the link quality between the satellite and the ground station, the received power, and the satellite orbit.

[0058] And by solving the above coupled differential equations, the change of link quality over a period of time can be obtained.

[0059] It should be noted that in satellite communication systems, the change in link quality is a dynamic process that fluctuates over time. In order to quantify this change, we usually focus on the average received power P avg This indicator can help us evaluate the signal quality during the entire communication process. The received power P(t) as a function of time may change greatly during the communication process. In order to understand the overall performance of the signal quality during this process, it is necessary to integrate P(t) over time within a communication window to obtain the overall average performance of the system.

[0060] The received power P(t) of the communication link as a function of time reflects the link status at any time t. In order to calculate the average received power P avg , it is necessary to integrate the received power during the communication period.

[0061] Assume that our communication period is from t=0 to t=T, where T is the communication duration. The average received power P avg It is the time average value of the received power P(t) over the entire time interval. This average value can be expressed by the following integral:

[0062] , through this integral model, the integral of the received power P(t) in the time interval [0,T] can be calculated, and then divided by T to obtain a time average value, which reflects the overall performance of the link quality and can be used to evaluate the long-term stability and reliability of the network. The average received power reflects the average signal strength during the entire communication process. Through this model, the overall performance of the link can be estimated through the time average value even in an environment where the satellite moves at high speed and the link status changes rapidly.

[0063] In the above steps, by analyzing the factors that change the quality of the communication link, a coupled differential equation group is constructed, and an integral model is constructed to calculate the average received power. The following will describe in detail how to combine the coupled differential equation group and the SIP technology to construct a more stable communication link.

[0064] The specific contents include the following:

[0065] SIP technology is mainly used in the field of information communication, especially in network services, signal processing and communication link management. It usually involves the integration of network resources, the coordination of protocols and the service interface between different systems.

[0066] Mapping of link quality to quality of service (QoS):

[0067] SIP technology is widely used in the network, especially in the scenario of providing multiple communication services. The quality of these services in the satellite-to-ground communication network is usually closely related to the link quality (such as signal strength, delay, bandwidth, etc.). The link quality α(t), received power P(t) and satellite orbit dynamics in the coupled differential equations can be mapped to the network quality of service (QoS). For example, link quality α(t) can be used as a key parameter of network service, affecting network delay, throughput and packet loss rate.

[0068] SIP can dynamically adjust the allocation and priority of network services according to changes in link quality. For example, when the link quality decreases, SIP technology can adjust the data transmission strategy in real time, select a more stable service or switch to other backup links. The coupled differential equations provide a dynamic time evolution description, for example, it can be used and To drive the adaptive control algorithm of the SIP protocol stack and adjust the link strategy in real time.

[0069] In satellite communication systems, resource allocation and scheduling (such as bandwidth, spectrum, power, etc.) are key tasks. SIP technology can be used to manage these resources, especially in the face of changing link conditions (such as changes in link quality due to changes in satellite orbit).

[0070] By integrating the real-time data of satellite links (such as d(t), α(t), P(t), etc.) into the resource scheduling system of the SIP protocol stack, the platform can allocate and schedule resources more accurately to optimize service quality and link performance.

[0071] The specific steps include the following:

[0072] 1) Using the link quality α(t), received power P(t) in the coupled differential equations, and the dynamic relationship between the satellite and the ground station (such as distance d(t) and satellite orbit), a mapping relationship between link quality and QoS indicators (such as delay, bandwidth, packet loss rate, etc.) can be established. For example:

[0073] delay(t) ∝ vd(t) (the relative speed and distance between the satellite and the ground station affect the transmission delay);

[0074] Bandwidth(t) ∝ α(t) (link quality is proportional to the available bandwidth).

[0075] These mapping relationships can help the SIP protocol stack adjust network services according to the real-time status of the satellite link.

[0076] At the same time, use P avg As the input of link quality assessment, the average received power of each link is calculated. avg The value of selects the best path and route, giving priority to paths with higher received power to ensure high-quality communication.

[0077] When P avg When P is high, the SIP protocol stack can dynamically increase the bandwidth and adopt a more efficient modulation method. avg When P is low, the SIP protocol stack can reduce bandwidth, reduce traffic requirements, use more robust modulation methods to improve anti-interference, and increase transmit power to improve link stability. avg If the value is low for a long time, the SIP protocol stack can trigger redundant link switching and perform dynamic path selection according to the change of link quality. Through the above steps, the link is reconfigured and the fault tolerance mechanism is adjusted to ensure uninterrupted communication.

[0078] And based on P avg ,The SIP protocol stack can dynamically adjust the QoS policy, allocate bandwidth according to the priorities of different services, and ensure that high priority traffic is transmitted first.

[0079] 2) Real-time monitoring and link quality feedback. In the SIP protocol stack, real-time monitoring of the status of the satellite link is the key. The various indicators in the coupled differential equations (such as link quality α(t), received power P(t), relative position of the satellite, etc.) are used as input and processed by the real-time monitoring and feedback system. Specifically, the SIP protocol stack integrated in the satellite's communication module will regularly obtain satellite orbit data, calculate the distance d(t), and based on this, calculate the link quality α(t) and received power P(t). At the same time, these real-time data will be passed to the network management module of the SIP protocol stack as feedback information to dynamically adjust resource allocation and service quality strategies.

[0080] 3) Combined with the link quality dynamics of the coupled differential equations, the SIP protocol stack can optimize different network services. For example, when the link quality decreases, the SIP protocol stack can automatically adjust the data transmission rate or switch to a redundant link. Through adaptive control, the SIP protocol stack can optimize link usage by adjusting the transmission protocol, selecting the best path, adjusting the packet size, etc., thereby improving communication quality. For example, after receiving a signal that the link quality has decreased, the platform may take measures such as compressing data and reducing resolution to ensure service quality.

[0081] When the link quality α(t) is poor, low-bandwidth but critical services (such as voice communication) can be prioritized, while when the link quality is good, higher-bandwidth services (such as high-definition video transmission) are supported. When the link quality is good, higher-bandwidth services (such as high-definition video transmission) are supported. At the same time, based on the satellite orbit and link status, the SIP protocol stack can dynamically adjust bandwidth, spectrum and power allocation. This resource scheduling not only depends on the current link quality, but also needs to consider the long-term stability and reliability of the system.

[0082] Through the above steps, the coupled differential equations can be organically combined with the SIP protocol stack, thereby realizing the mapping of link quality and QoS, real-time feedback and monitoring, adaptive service adjustment, resource scheduling and management, and integration with the existing network infrastructure. Through the above steps, SIP technology can play an enhanced network service capability in the satellite communication environment, thereby improving the reliability and efficiency of the overall link.

[0083] Step 3: By adaptively adjusting the transmission rate, selecting redundant links, and dynamically optimizing bandwidth, spectrum, and power allocation through the SIP protocol stack, the configuration of routing forwarding rules can be made easier while ensuring the quality of service.

[0084] In the stage of configuring routing forwarding rules, it is necessary to use the real-time link quality data collected in step 2 (such as link quality α(t), received power P(t), distance d(t), etc.) and combine it with the routing forwarding strategy to achieve dynamic routing selection based on link quality.

[0085] Specifically, it includes the following:

[0086] According to the real-time link quality feedback mechanism in step 2, the "health status" of the link is determined by monitoring the satellite link. The forwarding rules of the route can be selected through the following steps:

[0087] 1) Perform health assessment on the link and evaluate the health of the link based on the output of the coupled differential equation system. For example, a decrease in link quality α(t) may mean a decrease in received power P(t) or an increase in latency, further affecting bandwidth and packet loss rate.

[0088] 2) Select the routing strategy based on the results of the link health assessment. The SIP protocol stack can select the optimal forwarding path based on QoS indicators such as link quality, received power, and latency. Specifically: When the link quality decreases, the SIP protocol stack may switch to a redundant link or select a higher-quality intersatellite link to ensure uninterrupted communication. When the link quality is good, a higher-bandwidth path can be selected to support high-quality services.

[0089] At the same time, the change of received power P(t) can be used to dynamically adjust the transmission power. If the link quality is reduced, the power can be increased to enhance the reliability of the signal; if the link quality is good, the power may be reduced to save energy and reduce interference.

[0090] In other words, the link health status will affect the selection of routing priority. Paths with poor link quality may be lowered in priority, and the system will dynamically schedule traffic to healthier paths.

[0091] 3) Allocate data streams to multiple links based on real-time link quality and traffic demand. If the bandwidth or delay between two satellite-to-ground links changes, the platform can dynamically adjust traffic distribution through load balancing algorithms (such as weighted round-robin, shortest path priority, etc.) to reduce link congestion and improve overall efficiency.

[0092] At the same time, by introducing redundant links in the routing configuration, automatic switching can be achieved when problems occur in the main link. When the α(t) or P(t) of the main link drops to a certain critical value, it will automatically switch to the backup link to ensure uninterrupted communication.

[0093] Step 4: Based on the results of link interconnection in step 2 and dynamic routing selection of link quality in step 3, configure IP routing forwarding rules for satellite-to-ground links and inter-satellite links, thereby building a space-ground integrated communication network.

[0094] The integrated communication network combines satellite communication links, ground communication links and the Internet, ensuring that different communication terminals can interconnect in the integrated network through the SIP protocol.

[0095] In this way, the satellite system can access the Internet, and user terminals (such as satellite communication terminals) can use this network to perform remote telemetry and remote control operations.

[0096] After the space-ground integrated network is built, the satellite can access the Internet through the established network to realize remote telemetry and remote control functions. Based on SIP technology, the system can dynamically manage various communication sessions, provide real-time control and feedback, and ensure the efficient execution of telemetry and remote control operations.

[0097] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing a satellite-based integrated X-band communication network based on SIP technology, characterized in that: The construction method comprises: S100, builds the underlying link, uses X-band as the transmission medium of the physical layer, and communicates between the satellite and the ground station through the X-band frequency. Satellite transceivers, as physical layer devices, complete the basic data transmission between satellites and ground stations; S200 connects the network layer protocol with the X-band communication link. A ground SIP proxy server is built into the ground receiving end to manage the SIP protocol connection with the satellite, support signal scheduling, resource allocation and status monitoring, It manages user requests according to the SIP protocol, processes call requests, session establishment and termination, and provides communication transmission through X-band satellite links. The SIP protocol stack is deployed in the ground station, satellite and terminal equipment at the same time. The devices can communicate through standard signaling and session management protocol. The SIP protocol stack can dynamically monitor the link quality data in real time according to environmental changes and adjust the bandwidth according to the monitored link quality data, thereby realizing a stable connection of the protocol stack between the satellite and the ground station. S300, combining the link quality data described in step S200 with the routing forwarding strategy to implement dynamic routing forwarding rule selection based on link quality; S400, according to the link interconnection in S200 and the routing forwarding strategy in S300, configure the IP routing forwarding rules of the satellite-to-ground link and the inter-satellite link, and build and obtain a space-ground integrated communication network; The method of dynamically adjusting the bandwidth according to environmental changes comprises the following steps: The rapid changes in the communication link caused by the high speed of the satellite in the low earth orbit environment are described by the following coupled differential equations: ， ， ， Among them, d(t) is used to represent the distance between the satellite and the ground station at time t; θ(t) is used to represent the angle change, describing the angular position of the satellite in orbit; α(t) is used to represent the link quality; P(t) is used to represent the received power at time t; δ(t) is used to represent the additional attenuation caused by factors such as the atmosphere and clouds; λ is used to represent the wavelength of the X-band; γ is the path loss index, which takes a value of 2~4; v is the speed of the satellite; k1 and k2 are attenuation coefficients; P0 is the transmission power, and μ is the standard gravitational parameter of the earth; r(t) is the position vector of the satellite, indicating the relative position of the satellite to the center of the earth; The signal quality of the entire communication process is evaluated according to the coupled differential equations. The average received power P is calculated by time integrating the received power P(t) within a communication window. avg , The average received power P avg It can be expressed by the following integral formula: ， The integral formula calculates the integral of the received power P(t) over the time interval [0, T] and then divides it by T to obtain an average value over time. The average value reflects the overall performance of the link quality and is used to evaluate the long-term stability and reliability of the network. The parameters calculated by the coupled differential equations are used as real-time data of the satellite link and integrated into the resource scheduling system of the SIP protocol stack. The resource scheduling system for integrating parameters into the SIP protocol stack includes the following sub-steps: S210, establishing a mapping relationship between link quality and QoS indicator according to link quality α(t), receiving power P(t), distance d(t) between the satellite and the ground station, and satellite orbit; S220, use P avg As the input of link quality assessment, the average received power of each link is calculated, and P is obtained according to the calculation avg The value of selects the best path and route, giving priority to paths with high receiving power to ensure high-quality communication; And based on P avg ,The SIP protocol stack can dynamically adjust the QoS policy and allocate bandwidth according to the priorities of different services, ensuring that high-priority traffic is transmitted first; S230, taking each parameter in the coupled differential equation group as input, taking each input parameter as real-time data and feedback information, passing it to the network management module of the SIP protocol stack, and combining it with P avg , which enables the SIP protocol stack to dynamically adjust the QoS policy and allocate bandwidth according to the priority of different services to ensure that high-priority traffic is transmitted first.

2. The method for constructing a satellite-based integrated X-band communication network based on SIP technology according to claim 1, characterized in that: The communication module carried on the satellite is integrated with a SIP protocol stack, which is used to provide the session management function of the SIP protocol, control data flow, route selection and session maintenance. The routing on the satellite is based on the call routing and address resolution mechanism in the SIP protocol to achieve flexible selection of communication paths.

3. The method for constructing a satellite-based integrated X-band communication network based on SIP technology according to claim 1, characterized in that: The mapping relationship between the link quality and the QoS indicator includes: delay(t) ∝ vd(t), which is used to indicate that the relative speed and distance between the satellite and the ground station affect the transmission delay; Bandwidth(t) ∝ α(t), which is used to express that the link quality is proportional to the available bandwidth.

4. The method for constructing a satellite-based integrated X-band communication network based on SIP technology according to claim 1, characterized in that: The calculation results in P avg The value of selects the best path and routing includes the following steps: When P avg When the value of is high, the SIP protocol stack dynamically increases the bandwidth and uses efficient modulation methods; When P avg When the value is low, the SIP protocol stack can reduce bandwidth, reduce traffic demand, use a stable modulation method to improve anti-interference, and increase the transmission power to improve link stability. If P avg If the value remains low for a long time, the SIP protocol stack triggers redundant link switching and performs dynamic path selection based on changes in link quality.

5. The method for constructing a satellite-based integrated X-band communication network based on SIP technology according to claim 1, characterized in that: The step S300 includes the following sub-steps: S310, evaluating the health status of the link according to the output of the coupled differential equation system; S320, select the optimal forwarding path based on the evaluated link health status combined with the QoS indicator, and dynamically adjust the transmission power according to the change of the received power P(t), When the link quality decreases, the power is increased to enhance the reliability of the signal, and when the link quality is good, the power is reduced to save energy and reduce interference; S330, according to the real-time link quality and traffic demand, distribute the data flow to multiple links, and introduce redundant links in the routing configuration. When the α(t) or P(t) of the main link drops to the critical value, it automatically switches to the backup link to ensure uninterrupted communication.

6. A satellite-based integrated X-band communication network system based on SIP technology, characterized in that: The communication network system comprises: processor; A memory storing a computer program, which, when executed by a processor, implements the satellite-based integrated X-band communication network method based on the SIP technology as described in any one of claims 1 to 5.

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