CN114157334B - Satellite communication access system and transmission analysis method - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
A satellite communication access system and a transmission analysis method, comprising: analyzing the satellite communication application requirements; converting the application requirements into system requirements for designing a system according to the application requirement analysis result; according to the system demand, constructing a framework and a transmission method of a satellite communication access system by taking an access link between a user section and a space section as a target, and forming a satellite communication access system hierarchical framework; partitioning the logic modules based on physical locations, organizational responsibilities, or other distribution criteria of each logic module of the satellite communication access system; determining a node physical architecture facing the problem of architecture balance optimization in the physical implementation process; identifying a problem to be analyzed in the physical architecture balance optimization process according to the logical architecture partitions and the node physical architecture, defining an analysis model, and obtaining a system design analysis result through engineering simulation; and comparing the system design analysis result with the requirement, and giving a conclusion that the requirement meets.
Description
Technical Field
The invention relates to a satellite communication access system and a transmission analysis method, belonging to the technical field of system engineering.
Background
The problems of the current satellite communication access system and transmission method include the following:
(1) The traditional satellite access system modeling method has the limitation that: the modeling method of the satellite access system is designed mainly by taking modeling of a ground communication system as reference and sending and receiving simulation of a communication flow. Because the core node communication satellite in the satellite communication system has the characteristics of irreparable and irreplaceable, the resource limitation condition of the satellite to the whole system can not be comprehensively described by simulating the system only from the communication flow. There is an urgent need to fully describe the transmission and resource usage of satellite communication systems from a system engineering perspective.
(2) The resource allocation flow of the satellite communication access system is not clear enough to comb: the current ground communication system has perfected the resource allocation process of the access system, but for the satellite access process, key transmission information and affected modules with core requirements for the satellite resources are not formed, and meanwhile, the design of the ground terminal side is used for the satellite resource allocation, and the retransmission mechanism originally used in the ground communication system also needs to be redesigned.
(3) The current satellite communication access system transmission analysis method has limited effect on-board architecture optimization: there are deficiencies in connection relation and retransmission mechanism optimization models based on satellite resource modules and terrestrial retransmission mechanisms, and no deduction design is possible based on a reusable model-based method.
Disclosure of Invention
The invention solves the technical problems that: the method overcomes the defects of the prior art, overcomes the defects of the existing communication access system modeling and transmission analysis method under the framework of a model-based design concept and an object-oriented system engineering methodology, improves a satellite-to-ground link on the basis of a ground communication access system, and provides a comprehensive satellite communication access system design and analysis method which is characterized by node logic architecture decomposition, analysis model identification definition, simulation execution and demand tracing.
The technical scheme of the invention is as follows: a satellite communication access system and a transmission analysis method, comprising the following steps:
step1, analyzing satellite communication application requirements;
step 2, converting the application requirements into system requirements for designing a system according to the application requirement analysis result;
Step 3, constructing a satellite communication access system architecture and a transmission method by taking an access link between a user section and a space section as a target according to system requirements to form a satellite communication access system hierarchical architecture;
Step 4, partitioning the logic modules based on the physical position, organization responsibility or other distribution standards of each logic module of the satellite communication access system on the basis of the hierarchical architecture of the satellite communication access system; determining a node physical architecture facing the problem of architecture balance optimization in the physical implementation process;
step 5, identifying the problem to be analyzed in the physical architecture balance optimization process according to the logical architecture partition and the node physical architecture, defining an analysis model, and obtaining a system design analysis result through engineering simulation;
and 6, comparing the system design analysis result with the requirement, and giving a conclusion that the requirement meets the requirement.
Further, the step 3 specifically includes: logic decomposition and logic interaction.
Further, the logic decomposition is used for decomposing a logic level of the system and carrying out specific logic modeling on the field range related to the satellite communication system; the system specifically comprises a user terminal, a user link channel, an access satellite, a satellite network, a feed link channel and a ground management and control center;
The user terminal is divided into service application, resource management and link transmission according to the core function, the access satellite is divided into satellite load and satellite platform according to the task function and the supporting function, the satellite network is divided into signaling communication and service transmission according to the core function, the ground management and control center refers to the core function of the smooth evolution architecture from the ground fourth generation mobile communication system to the fifth generation mobile communication system, and the system design and control center, service management, communication management, comprehensive operation and maintenance, safety protection, database, visualization, system performance module, demand and efficiency are divided by combining the characteristics of the space-based system.
Further, the logic interaction is used for designing activities, interfaces and parameter relations among elements with the aim of meeting the design requirements of the system.
Further, the step 4 specifically includes: node logical architecture decomposition and node physical architecture definition.
Further, the node logic architecture decomposes a logic function for realizing the access of the user segment to the space segment; the method specifically comprises the following steps: a user terminal and an access satellite. Wherein the user terminal comprises a part for realizing the function of accessing the space segment: service application, resource management and link transmission, the access satellite comprises a part for realizing the access function of the user section: satellite loading. The satellite payload contains the specific parts that implement the user segment access functionality: satellite links and satellite access.
Further, the node physical architecture definition is used for performing physical architecture balance optimization for the efficiency of the resource management system in the physical implementation process of the logic architecture, and defining the physical architecture; the physical architecture of module resource management related to resource allocation in the user terminal is defined, and the physical architecture is divided into an access request, a data volume report, service information and channel quality feedback based on the core function of the user side compatible with the ground 4G and 5G systems. The physical architecture of module satellite access related to resource allocation in an access satellite is defined, and the physical architecture is divided into resource allocation, retransmission processing and channel processing based on the core function of a base station side compatible with a ground 4G system and a 5G system.
Further, identifying the problem to be analyzed in the physical architecture tradeoff optimization process includes: in the satellite communication access process, the connection relation between the user terminal and a resource scheduling related module in an access satellite; the method comprises the following steps: firstly, an access request and a data volume report for realizing a link establishment function in a user terminal are connected with a resource allocation module in an access satellite; the service information for realizing the data transmission function in the user terminal is connected with a resource allocation module in the access satellite; secondly, establishing a retransmission mechanism for the access satellite by the access request, the data volume report and the service information in the user terminal, and balancing and optimizing the retransmission times between retransmission processing in the access satellite by analysis; thirdly, the channel quality state needs to be updated between the user terminal and the access satellite at any time, and the channel quality feedback should also establish a retransmission mechanism, so that the channel quality feedback in the user terminal and the retransmission process and the channel process in the access satellite should establish a transmission mechanism, and the number of times of transmission or retransmission is optimized by analysis and balancing.
Further, the defining of the analysis model includes: according to the problem content given by the analysis problem identification, defining the target, constraint and design independent variable of the analysis problem; the objective of analyzing the problem is: the time delay of signal transmission between the user terminal and the access satellite and the system capacity which can be realized by a retransmission mechanism on the access satellite; constraints on analysis of the problem are: the access request, the data volume report and the service information in the user terminal are connected with a resource allocation module in the access satellite; the design arguments for the analysis problem are: access request transmission times, data volume report transmission times, service information transmission times and channel quality feedback transmission times.
Further, the engineering simulation includes: and carrying out multi-objective optimization simulation according to the analysis model definition, analyzing a efficacy value scatter diagram formed by the objective of the architecture design optimization, finding out the pareto front, weighing to obtain elite architecture points, and giving out corresponding design independent variable values to obtain the conclusion of the architecture design optimization.
Compared with the prior art, the invention has the advantages that:
(1) The invention discloses a model-based system engineering method, which adopts an internationally standardized model-based system engineering methodology (OOSEM) to design a satellite communication access system and a modeling method. According to the improvement of the characteristics of the current satellite communication system, a top-down design concept is adopted, the satellite communication access system is established as an association relation between a node logic architecture and a complete satellite communication network, the capability of expanding to a refinement design stage of a subsequent satellite access system is provided, convenience is provided for demand management and tracking in product research and development processes, and traceability of research and development design information is ensured.
(2) In the definition of the node physical architecture of the satellite communication access system, a framework for carrying out physical architecture balance and optimization on the system efficiency of the communication link access resource management in the physical implementation process of the logic architecture is provided, and the physical architecture is defined. The method comprises the steps of extracting information such as an access request, data volume report, service information, channel quality feedback and the like which are the most core in a communication access process, defining a module related to resource allocation in an access satellite, designing core functions such as resource allocation, retransmission processing, channel processing and the like of a ground base station side, and establishing a base for modeling design and simulation of a satellite communication access system.
(3) Compared with the prior art, the method utilizes a model-based design methodology to identify the problem to be analyzed in the physical architecture weight optimization process from deduction of user requirements and functional architectures, and simulate the problem. The method comprises the steps of defining the connection relation between a user terminal in a satellite communication access system and a resource scheduling related module in an access satellite for the first time, designing a retransmission mechanism optimization model, and optimizing and utilizing limited resources on the satellite by analyzing and balancing satellite-ground retransmission times.
Drawings
FIG. 1 is a schematic diagram of a model-based satellite communication access system and transmission analysis method of the present invention;
FIG. 2 is a logically exploded schematic view of the present invention;
FIG. 3 is an exploded view of the node logic architecture of the present invention;
FIG. 4 is a schematic diagram of a node physical architecture definition according to the present invention;
FIG. 5 is a schematic diagram illustrating the analysis of problem identification according to the present invention;
FIG. 6 is a logically exploded embodiment of the present invention;
FIG. 7 is a diagram illustrating node logic architecture decomposition-embodiment-SR transmission in accordance with the present invention;
FIG. 8 is a diagram illustrating node logical architecture decomposition-embodiment-BSR transmission according to the present invention;
FIG. 9 is a diagram illustrating node logical architecture decomposition-embodiment-SI transmission according to the present invention;
FIG. 10 is a diagram of node logical architecture decomposition-embodiment-CQI transmission according to the present invention;
FIG. 11 is an exemplary analysis problem identification-embodiment-resource allocation of the present invention;
FIG. 12 is an analysis problem identification-embodiment-retransmission process of the present invention;
FIG. 13 is an analysis problem identification-embodiment-channel processing of the present invention;
FIG. 14 is an illustration of an engineering simulation implementation of the present invention.
Detailed Description
In order to better understand the technical solutions described above, the following detailed description of the technical solutions of the present application is made by using the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limiting the technical solutions of the present application, and the embodiments and technical features of the embodiments of the present application may be combined with each other without conflict.
The following describes in further detail a satellite communication access system and a transmission analysis method provided by an embodiment of the present application with reference to the accompanying drawings, and the specific implementation manner may include (as shown in fig. 1 to 14): stakeholder requirements analysis 1, system requirements (black box) analysis 2, logical architecture (white box) analysis 3, logical architecture decomposition and alternative physical architecture analysis 4, assessment and optimization 5, and requirement trace 6.
Logical architecture (white box) analysis 3 includes logical decomposition 31 and logical interactions 32.
Logical architecture decomposition and alternative physical architecture analysis 4 includes node logical architecture decomposition 41 and node physical architecture definition 42 for a satellite communication access system.
The evaluation and optimization 5 comprises analysis problem recognition 51, analysis model definition 52 and engineering simulation execution 53 for the transmission analysis of the satellite communication access system.
In one possible implementation manner, the method specifically includes:
1. Stakeholder needs analysis 1 analyzes the application needs from the perspective of the system stakeholder, forming an input to system needs (black box) analysis 2.
2. The system requirements (black box) analysis 2 converts the application requirements of interest to stakeholders into system requirements that the system builder can directly use to design the system based on the stakeholder requirements analysis 1.
3. The logical architecture (white box) analysis 3 takes as input the output of the system demand (black box) analysis 2 to perform system design. The satellite communication access system aims at an access link between a user section and a space section, and designs an architecture and a transmission method.
The a logic decomposition 31 is a decomposition of the logic hierarchy of the system, and specifically models the domain area of the satellite communication system, as shown in fig. 2. Including a user terminal 3101, a user link channel 3102, an access satellite 3103, a satellite network 3104, a feeder link channel 3105, and a ground control center 3106.
The user terminal 3101 is divided into a service application 3107, a resource management 3108 and a link transmission 3109 according to core functions, the access satellite 3103 is divided into a satellite load 3110 and a satellite platform 3111 according to task functions and supporting functions, the satellite network 3104 is divided into a signaling communication 3112 and a service transmission 3113 according to core functions, the ground management center refers to a core function of a structure that a ground fourth generation mobile communication system 4G smoothly evolves to a fifth generation mobile communication system 5G, and is divided into a system design and control center 3114, a service 3115, a service management 3116, a communication management 3117, a comprehensive operation 3118, a security protection 3119, a database 3120, a visualization 3121, a system performance module 3122, a requirement and a performance 3123 in combination with characteristics of a space-based system.
The satellite payload 3110 refers to the international standardized open system architecture OSI and combines the features of the satellite system, and uses the core functions of the lower three layers of OSI, namely, the network layer, the data link layer and the physical layer, to divide into a satellite route 3124, a satellite access 3125 and a satellite link 3126. The satellite platform may also be functionally divided into corresponding parts.
The logic interaction 32 is designed to meet the design requirement of the system, and the relationships of activities, interfaces, parameters and the like among elements are designed.
4. The logic architecture decomposition and alternative physical architecture analysis 4 partitions the logic modules based on the physical location, organization responsibilities, or other distribution criteria of the logic modules based on the hierarchy formed by the satellite communication access system logic architecture (white box) analysis 3; and defines the physical architecture facing the architecture trade-off optimization problem in the physical implementation process.
The a-node logical architecture decomposition 41 is a logical functional part of the logical decomposition 31 that implements the user segment access space segment, as shown in fig. 3. Including a user terminal 4101 and an access satellite 4102. Wherein the user terminal 4101 contains a portion for implementing the access space segment functionality: the service application 4103, resource management 4104 and link transfer 4105, the access satellite 4102 contains parts for implementing user segment access functionality: satellite load 4106. The satellite payload 4106 contains specific parts that implement the user segment access functionality: satellite link 4107 and satellite access 4108.
The b-node physical architecture definition 42 is a definition of a physical architecture that performs physical architecture trade-off optimization for the performance of the resource management system in the physical implementation process of the logical architecture. As shown in fig. 4. The physical architecture of the module resource management 4204 related to resource allocation in the user terminal 4201 is defined, and is divided into an access request 420401, a data volume report 420402, service information 420403 and channel quality feedback 420404 based on the core functions of the user side of the compatible terrestrial 4G and 5G systems. Defining the physical architecture of the module satellite access 4208 related to resource allocation in the access satellite 4202, and dividing the physical architecture into resource allocation 420801, retransmission 420802 and channel 420803 based on the core function of the base station compatible with the terrestrial 4G and 5G systems
5. The transmission analysis method of the satellite communication access system is characterized in that: including two parts, evaluation and optimization 5 and demand trace 6.
The evaluation and optimization 5 analyzes the node physical architecture defined in 4 according to the logic architecture, identifies the problem to be analyzed in the physical architecture balance optimization process, defines an analysis model, and obtains an analysis result through engineering simulation.
The a analysis problem identification 51 shows the connection relationship between the user terminal 5101 and the resource scheduling related module in the access satellite 5102 in the satellite communication access process, as shown in fig. 5. Firstly, an access request 510101 and a data volume report 510102 for realizing a link establishment function in a user terminal 5101 must be connected with a resource allocation 510201 module in an access satellite 5102; the service information 510103 in the user terminal 5101, which implements the data transfer function, must be connected to the resource allocation 510201 module in the access satellite 5102. Because of various attenuations of channel transmission, the access request 510101, the data volume report 510102 and the service information 510103 in the user terminal 5101 need to establish a retransmission mechanism to the access satellite 5102, and the number of retransmission times between optimization and retransmission processing 510202 in the access satellite 5102 is balanced through analysis; third, the channel quality status needs to be updated between the user terminal 5101 and the access satellite 5102 at any time, and the channel quality feedback should also establish a retransmission mechanism, so the channel quality feedback 510104 in the user terminal 5101 should establish a transmission mechanism with the retransmission process 510202 and the channel process 510203 in the access satellite 5102, and the number of transmissions or retransmissions should be optimized by analysis and trade-off.
B analytical model definition 52 defines the objectives, constraints and design arguments of the analytical problem based on the content of the problem given by the analytical problem identification 51. The objective of analyzing the problem is: the time delay of signal transmission between the user terminal 5101 and the access satellite 5102, and the system capacity that can be achieved by implementing a retransmission mechanism on the access satellite 5102. The constraints of analyzing the problem are: access requests 510101, data volume reports 510102, traffic information 510103 in the user terminal 5101 must be connected with the resource allocation 510201 module in the access satellite 5102. The design arguments for the analysis problem are: access request 510101 number of transmissions, data volume report 510102 number of transmissions, traffic information 510103 number of transmissions, channel quality feedback 510404 number of transmissions.
And c, performing multi-objective optimization simulation by the engineering simulation execution 53 according to the analysis model definition 52, analyzing a efficacy value scatter diagram formed by the objective of the architecture design optimization, finding out pareto fronts, weighing to obtain elite architecture points, and giving out corresponding design independent variable values to obtain a conclusion of the architecture design optimization.
6. The requirement tracing 6 is to compare the result of the system design with the requirement, and give the requirement meeting condition.
Logic decomposition embodiment
As shown in fig. 6, a logic decomposition 31 is shown in an embodiment of the present invention.
A wherein the user terminal 3101 is embodied as: the business application 3107 acts as an interface to the user's use and interacts with the user's requirements with the resource management 3108 and then enters the wireless link to satellite connection via link transmission 3109.
B wherein the access satellite 3103 is embodied as a satellite in and 3110 and its next-tier components, including a satellite route 3124 implementing network-tier protocol functionality, a satellite access 3125 implementing data link layer functionality, and a satellite link 3126 for physical layer functionality, then enters the wireless link to connect with the user terminal 3101.
The satellite network 3104 abstracts and implements the functions of the satellites in the network into two functional modules, namely signaling connection 3112 and service transmission 3113, to implement the functions of connection and transmission of user application services when the initial link is established, respectively.
D wherein the ground control center 3106 is embodied as six core functional modules related to modeling. Wherein the service 3115 serves as a direct interface with the administration center user, providing a user interface and interfacing with the architecture design and control center 3114 through the service administration 3116. At the same time, business 3115 provides an interface with integrated operation 3118 and security 3119. The architecture design and control center 3114 is also connected to comprehensive operation 3118 and security 3119 as a core control module for the entire network. Communication management 3117 provides physical link connections with satellite ground gateway stations.
Node logic architecture decomposition-embodiment
The node logical architecture decomposition 41 implements the logical function of the user segment access space segment. The method is implemented as a processing procedure of a main flow of user access in each component part of the invention. Comprising the following four activity diagrams:
access request SR (Scheduling Request) transmission: the service application 4103 in the user terminal 4101 makes a terminal access request 410301, performs terminal access request resource allocation 410401-1 by the resource management 4104, and then performs terminal access request link transmission 410501-1 through the link transmission 4105. After the satellite load 4106 transmitted to the access satellite 4102 through the wireless channel, the satellite resource allocation link transmission 410701-1 of the physical layer is performed by the satellite link 4107, and then the satellite resource allocation 410801-1 is performed by the satellite access 4108. Depending on the channel quality status, the resource management 4104 of the ue 4101 may need SR retransmission, i.e. the terminal access request link retransmission 410501-2 is performed by the link transmission 4105, the physical layer satellite retransmission process link transmission 410701-2 is performed by the satellite link 4107 after the satellite load 4106 is transmitted to the access satellite 4102 through the wireless channel, and then the satellite retransmission process 410801-2 is performed by the satellite access 4108.
Data volume report BSR (Buffer Status Report) transmission: the resource management 4104 in the user terminal 4101 proposes a terminal data volume report 410402 and then makes a terminal data volume report link transmission 410502-1 over the link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 through the wireless channel, the satellite resource allocation link transmission 410702-1 of the physical layer is performed by the satellite link 4107, and then the satellite resource allocation 410802-1 is performed by the satellite access 4108. Depending on the channel quality status, the resource management 4104 of the ue 4101 may need to perform BSR retransmission, i.e. the terminal data amount reporting link retransmission 410502-2 is performed by the link transmission 4105, and after the terminal data amount reporting link retransmission is performed by the satellite load 4106 transmitted to the access satellite 4102 through the wireless channel, the physical layer satellite retransmission processing link transmission 410702-2 is performed by the satellite link 4107, and then the satellite retransmission processing 410802-2 is performed by the satellite access 4108.
Traffic information SI (Service Information) transmission: the service application 4103 in the user terminal 4101 presents terminal service information 410303, performs terminal service information resource allocation 410403 by the resource management 4104, and then performs terminal service information link transmission 410503-1 through the link transmission 4105. After the satellite load 4106 transmitted to the access satellite 4102 through the wireless channel, the satellite resource allocation link transmission 410703-1 of the physical layer is performed by the satellite link 4107, and then the satellite resource allocation 410803-1 is performed by the satellite access 4108. Depending on the channel quality status, the resource management 4104 of the ue 4101 may need to perform SI retransmission, i.e. the terminal traffic information link retransmission 410503-2 is performed by the link transmission 4105, and after the satellite load 4106 is transmitted to the access satellite 4102 through the wireless channel, the satellite retransmission processing link transmission 410703-2 of the physical layer is performed by the satellite link 4107, and then the satellite retransmission processing 410803-2 is performed by the satellite access 4108. According to the retransmission information, the ue 4101 may interact with the access satellite 4102 in terms of channel quality status, i.e. the ue traffic information channel quality retransmission 410503 is performed by the link transmission 4105 of the ue 4101, after the traffic information channel quality retransmission 410503 is transmitted to the satellite load 4106 of the access satellite 4102 through the wireless channel, the physical layer satellite channel processing link transmission 410703-3 is performed by the satellite link 4107, and then the satellite channel processing 410803-3 is performed by the satellite access 4108.
Channel quality feedback CQI (Channel Quality Information) transmission: the resource management 4104 in the user terminal 4101 proposes channel quality feedback 410404 and then makes channel quality feedback link transmissions 410504-1 over the link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 via the wireless channel, the satellite channel processing link transmission 410704-1 of the physical layer is performed by the satellite link 4107, and then the satellite channel processing 410804-1 is performed by the satellite access 4108. Depending on the channel quality status, the resource management 4104 of the ue 4101 may need to perform CQI retransmission, i.e. the channel quality feedback link retransmission 410504-2 is performed by the link transmission 4105, and after the channel quality feedback link retransmission is performed by the satellite load 4106 transmitted to the access satellite 4102 through the wireless channel, the physical layer satellite retransmission processing link transmission 410704-2 is performed by the satellite link 4107, and then the satellite retransmission processing 410804-2 is performed by the satellite access 4108.
Node physical architecture definition-embodiment
A specific implementation of the node physical architecture definition 42 is given in terms of the definition of the node physical architecture definition 42 for resource management 4204 in the user terminal 4201 and definition of satellite access 4208 in the access satellite 4202, according to the primary index latency and capacity optimized as required by the architecture design
For time delay, defining processing time delay unit parameters of a satellite-to-ground transmission time delay unit, a terminal and a satellite for each 1Mbps data:
the satellite-to-ground transmission delay unit is 9 milliseconds;
The SR processing time delay unit is 0.2 millisecond;
the BSR processing time delay unit is 0.4 millisecond;
the SI processing time delay unit is 1 millisecond;
The CQI processing delay unit is 0.5 ms.
For capacity, defining bit error rate reduction caused by satellite-to-ground retransmission or channel quality feedback, and thus capacity improvement index:
The SR retransmission capacity boost index is 1.01;
the BSR retransmission capacity boost index is 1.56;
The SI retransmission capacity boost index is 1.43;
CQI capacity retransmission index of 1.29
Analysis problem identification-example
The function of the user terminal 5101 for identifying analysis problems, which requires the definition of the transmitted information, is implemented as follows:
a access request 510101: the user terminal 5101 tells the access satellite 5102 that there is data to send by sending an access request SR510101 and requests the access satellite 5102 to allocate uplink channel resources.
B data volume report 510102: the user terminal 5101 informs the access satellite 5102 that there is upstream data to be transmitted only through the access request SR510101, but does not give the amount of data to be transmitted. The amount of data is informed 5102 by the user terminal 5101 sending a data amount report BSR 510102.
C service information 510103: the user terminal 5101 transmits traffic data to the access satellite 5102 through the allocated channel resources.
D channel quality feedback 510104: the user terminal 5101 transmits channel quality conditions to the access satellite 5102 and decides whether retransmission is required according to whether data is successfully received.
The analysis problem identification of the access satellite 5102 requires explicit user access related processing functions, which are implemented as follows:
a for resource allocation 510201 of access satellite 5102, there is a connection interface with at least one transmission of access request 510101, data volume report 510102 and traffic information 510103 of user terminal 5101, as shown by the solid line connection in fig. 11.
B for the retransmission process 510202 of the access satellite 5102, there is a connection interface with the access request 510101, data volume report 510102, traffic information 510103 and channel quality feedback 510104 of the user terminal 5101 for 0 or more transmissions, as shown by the dashed connection in fig. 12.
C for the channel processing 510203 of the access satellite 5102, a connection interface with the traffic information 510103 and channel quality feedback 510104 of the user terminal 5101 with 0 or 1 transmissions, as shown by the dashed line connection in fig. 13.
Analytical model definition-examples
According to the analysis problem identification in the technical scheme, for four "activity graphs" which are implemented in node logic architecture decomposition: SR transmission, BSR transmission, SI transmission and CQI transmission are respectively used for calculating the time delay and the capacity of the user link. The architectural design options of SR transmission, BSR transmission, SI transmission are embodied in 6 types, and the architectural design options of CQI transmission are embodied in 7 types.
The combination of the options results in a trade-off space size of 6+3x 7 = 1512.
Engineering simulation execution-embodiment
And analyzing a two-dimensional graph of the framework weighing space, finding out the pareto front, expanding to form a fuzzy pareto front, analyzing the characteristics of the framework, finding out elite framework types, and carrying out weighing decision on the time delay and the capacity of the satellite-ground link. After the engineering simulation of the analysis problem is implemented, the simulation result shown in fig. 14 is obtained.
From the trade-off space obtained by simulation, it can be seen that the architecture scatter forms clusters, all of which form an architecture set in the form of a finger. The data analysis shows that the data obtained by the method,
A) For each mechanism requiring retransmission design, the architecture with similar or identical retransmission times can obtain better time delay and capacity performance more easily,
B) In each cluster, an architecture with medium and similar number of retransmissions has better capacity performance.
C) In each layered architecture, the architecture with higher SR and BSR retransmission times has better latency performance. This means that in the process of designing the architecture, the design of more retransmission times in the link establishment process will result in better delay performance.
Demand traceability-embodiment
The demand satisfaction matrix is given according to the relationship between the design and the demand as shown in the following table. All the requirements are embodied in the corresponding design components. And for the transmission analysis of the satellite communication access system, the weighing analysis result of the physical design of the architecture module is traced back to the analysis background and the satisfaction of the analysis result to the analysis requirement is reflected in relation to the user terminal and the access satellite in the design.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (9)
1. A satellite communication access system and a transmission analysis method are characterized by comprising the following steps:
step1, analyzing satellite communication application requirements;
step 2, converting the application requirements into system requirements for designing a system according to the application requirement analysis result;
step 3, constructing a satellite communication access system architecture and a transmission method by taking an access link between a user section and a space section as a target according to system requirements to form a satellite communication access system hierarchical architecture;
Step 4, partitioning the logic modules based on the physical position and organization responsibility of each logic module of the satellite communication access system on the basis of the hierarchical architecture of the satellite communication access system; determining a node physical architecture facing the problem of architecture balance optimization in the physical implementation process;
Step 5, identifying a problem to be analyzed in the physical architecture balance optimization process according to the logical module partition and the node physical architecture, defining an analysis model, and obtaining a system design analysis result through engineering simulation;
Step 6, comparing the system design analysis result with the requirement, and giving a conclusion that the requirement meets the requirement;
The defining of the analysis model includes: defining a target, a constraint and a design independent variable of the analysis problem according to the problem content given by the analysis problem identification; the objective of analyzing the problem is: the time delay of signal transmission between the user terminal and the access satellite and the system capacity which can be realized by a retransmission mechanism on the access satellite; constraints on analysis of the problem are: the access request, data volume report and service information in the user terminal must be connected with the resource allocation module in the access satellite; the design arguments for the analysis problem are: access request transmission times, data volume report transmission times, service information transmission times and channel quality feedback transmission times.
2. The satellite communication access system and transmission analysis method according to claim 1, wherein the step 3 specifically comprises: logic decomposition and logic interaction.
3. The satellite communication access system and transmission analysis method according to claim 2, wherein the logic decomposition is used for decomposing a logic level of the system and performing specific logic modeling on a domain range related to the satellite communication system; the system specifically comprises a user terminal, a user link channel, an access satellite, a satellite network, a feed link channel and a ground management and control center;
The user terminal is divided into service application, resource management and link transmission according to the core function, the access satellite is divided into satellite load and satellite platform according to the task function and the supporting function, the satellite network is divided into signaling communication and service transmission according to the core function, the ground management and control center refers to the core function of the smooth evolution architecture from the ground fourth generation mobile communication system to the fifth generation mobile communication system, and the system design and control center, service management, communication management, comprehensive operation and maintenance, safety protection, database, visualization, system performance module, demand and efficiency are divided by combining the characteristics of the space-based system.
4. A satellite communication access system and transmission analysis method according to claim 2, wherein: the logic interaction is used for designing activities, interfaces and parameter relations among elements with the aim of meeting the design requirements of the system.
5. The satellite communication access system and transmission analysis method according to claim 1, wherein the step 4 specifically comprises: node logical architecture decomposition and node physical architecture definition.
6. The satellite communication access system and transmission analysis method according to claim 5, wherein: the node logic architecture decomposes a logic function for realizing the access of the user section to the space section; the method specifically comprises the following steps: a user terminal and an access satellite; wherein the user terminal comprises a part for realizing the function of accessing the space segment: service application, resource management and link transmission, the access satellite comprises a part for realizing the access function of the user section: satellite loading; the satellite payload contains the specific parts that implement the user segment access functionality: satellite links and satellite access.
7. The satellite communication access system and transmission analysis method according to claim 5, wherein: the node physical architecture definition is used for carrying out physical architecture balance optimization on the performance of the resource management system in the physical implementation process of the logic architecture, and defining the physical architecture; defining a physical architecture of module resource management related to resource allocation in a user terminal, and dividing the physical architecture into an access request, a data volume report, service information and channel quality feedback based on the core function of a user side compatible with a ground 4G system and a 5G system; the physical architecture of module satellite access related to resource allocation in an access satellite is defined, and the physical architecture is divided into resource allocation, retransmission processing and channel processing based on the core function of a base station side compatible with a ground 4G system and a 5G system.
8. The satellite communication access system and transmission analysis method according to claim 1, wherein the identifying the problem to be analyzed in the physical architecture tradeoff optimization process comprises: in the satellite communication access process, the connection relation between the user terminal and a resource scheduling related module in an access satellite; the method comprises the following steps: firstly, an access request and a data volume report for realizing a link establishment function in a user terminal are connected with a resource allocation module in an access satellite; the service information for realizing the data transmission function in the user terminal is connected with a resource allocation module in the access satellite; secondly, establishing a retransmission mechanism for the access satellite by the access request, the data volume report and the service information in the user terminal, and balancing and optimizing the retransmission times between retransmission processing in the access satellite by analysis; thirdly, the channel quality state needs to be updated between the user terminal and the access satellite at any time, and the channel quality feedback should also establish a retransmission mechanism, so that the channel quality feedback in the user terminal and the retransmission process and the channel process in the access satellite should establish a transmission mechanism, and the number of times of transmission or retransmission is optimized by analysis and balancing.
9. The satellite communication access system and transmission analysis method of claim 1, wherein the engineering simulation comprises: and carrying out multi-objective optimization simulation according to the analysis model definition, analyzing a efficacy value scatter diagram formed by the objective of the architecture design optimization, finding out the pareto front, weighing to obtain elite architecture points, and giving out corresponding design independent variable values to obtain the conclusion of the architecture design optimization.
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| WO2020098627A1 (en) * | 2018-11-12 | 2020-05-22 | 华为技术有限公司 | Satellite communication method, device and system |
| CN111447025A (en) * | 2020-03-18 | 2020-07-24 | 重庆邮电大学 | System-level simulation platform for satellite mobile communication and construction method |
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| WO2020098627A1 (en) * | 2018-11-12 | 2020-05-22 | 华为技术有限公司 | Satellite communication method, device and system |
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