CN114157334A - Satellite communication access system and transmission analysis method - Google Patents
Satellite communication access system and transmission analysis method Download PDFInfo
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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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- 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
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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
- H04B7/18519—Operations control, administration or maintenance
Abstract
A satellite communication access system and transmission analysis method, comprising: analyzing the application requirements of satellite communication; converting the application requirements into system requirements for designing a system according to the application requirement analysis result; according to system requirements, an access link between a user section and a space section is taken as a target, a structure and a transmission method of a satellite communication access system are constructed, and a satellite communication access system hierarchical structure is formed; partitioning the logic modules based on the physical positions, organization responsibilities or other distribution standards of the logic modules of the satellite communication access system; determining a node physical architecture facing to architecture balance optimization problem in the physical implementation process; according to the logical architecture partition and the node physical architecture, identifying a problem to be analyzed in the balance optimization process of the 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 the requirement.
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 modeling method of the satellite access system has the following limitations: the current modeling method for the satellite access system is designed by mainly taking the transmission and receiving simulation of a communication process as reference for the modeling of a ground communication system. Because a core node communication satellite in a satellite communication system has the characteristics of unrepairable and irreplaceable properties, the resource limitation condition of the satellite on the whole system cannot be completely described only by simulating the system from the perspective of a communication flow. There is a strong need to fully describe the transmission and resource usage of satellite communication systems from a system engineering perspective.
(2) The resource allocation process of the satellite communication access system is not clear enough: the current terrestrial communication system has been relatively perfect for the resource allocation process of the access system, but for the satellite access process, a key transmission information and an affected module having core requirements for the satellite resources are not formed, and meanwhile, the design of the terrestrial terminal side for the satellite resource allocation also needs to redesign the retransmission mechanism originally used in the terrestrial communication system.
(3) The current satellite communication access system transmission analysis method has limited effect on satellite architecture optimization: the connection relation based on the satellite resource module and the ground retransmission mechanism and the retransmission mechanism optimization model are lacked, and no reusable model-based method can be used for deduction design.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior 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 the satellite-ground link on the basis of a ground communication access system, and provides a comprehensive satellite communication access system design and analysis method through node logic architecture decomposition, analysis model identification definition, simulation execution and requirement tracing.
The technical solution of the invention is as follows: a satellite communication access system and a transmission analysis method include the following steps:
and 6, comparing the system design analysis result with the requirement, and giving a requirement satisfaction conclusion.
Further, the step 3 specifically includes: logical decomposition and logical interaction.
Further, the logical decomposition is used for decomposing the logical hierarchy of the system and carrying out specific logical modeling on the range of the field 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 control center;
the user terminal is divided into service application, resource management and link transmission according to core functions, the access satellite is divided into a satellite load and a satellite platform according to task functions and support functions, the satellite network is divided into signaling communication and service transmission according to the core functions, the ground management and control center refers to the core functions of a smooth evolution architecture of a ground fourth generation mobile communication system to a fifth generation mobile communication system and combines the characteristics of a space-based system to divide the system into a system design and control center, a service, service management, communication management, comprehensive operation and maintenance, safety protection, a database, visualization, a system performance module, requirements and efficiency.
Further, the logical interaction is used for designing the activities, interfaces and parameter relationships among the elements with the goal 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 logic functions for implementing a user segment access space segment; the method specifically comprises the following steps: a user terminal and an access satellite. Wherein the user terminal comprises a part thereof for implementing the access space segment function: service application, resource management and link transmission, the access satellite comprises a part for realizing the access function of a user section: the satellite load. The satellite load comprises the specific parts for realizing the user segment access function: satellite links and satellite access.
Furthermore, the node physical architecture definition is used for carrying out physical architecture balance optimization facing the efficiency of the resource management system in the physical implementation process of the logic architecture and defining the physical architecture; a physical framework of module resource management related to resource allocation in a user terminal is defined, and the physical framework is divided into an access request, a data volume report, service information and channel quality feedback based on core functions of a user side compatible with a ground 4G system and a ground 5G system. A 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 core functions of a base station side compatible with a ground 4G system and a ground 5G system.
Further, the identifying the problem to be analyzed in the physical architecture tradeoff optimization process comprises: in the satellite communication access process, the connection relationship between a user terminal and a resource scheduling related module in an access satellite; the method specifically 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, an access request, a data volume report and service information in the user terminal establish a retransmission mechanism to the access satellite, and retransmission times between optimization and retransmission processing in the access satellite are balanced through 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 processing and channel processing in the access satellite should establish a transmission mechanism, and the number of transmission or retransmission times is balanced and optimized through analysis.
Further, the defining the analytical model includes: identifying given problem content according to the analysis problem, and defining the target, constraint and design independent variable of the analysis problem; the targets of the analytical questions were: 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; the constraints of the analysis problem are: the access request, data volume report and service information in the user terminal must be connected with a resource allocation module in the access satellite; the design arguments for the analysis problem were: access request transmission times, data volume report transmission times, service information transmission times and channel quality feedback transmission times.
Further, the engineering simulation comprises: and performing multi-objective optimization simulation according to the definition of the analysis model, analyzing an effect value scatter diagram formed by the objective of the architecture design optimization, finding a pareto frontier, balancing to obtain an elite architecture point, and giving a corresponding design independent variable value to obtain a conclusion of the architecture design optimization.
Compared with the prior art, the invention has the advantages that:
(1) the invention relates to a model-based system engineering method, which adopts international standardized model-based system engineering methodology (OOSEM) to design a satellite communication access system and a modeling method. The method is improved according to the characteristics of the current satellite communication system, adopts a top-down design concept, establishes the satellite communication access system as the incidence relation between a node logic architecture and a complete satellite communication network, has the capability of expanding to the detailed design stage of the subsequent satellite access system, provides convenience for the requirement management and tracking of the product research and development process, and ensures the traceability of the research and development design information.
(2) In the definition of the node physical architecture of the satellite communication access system, a physical architecture balance optimization framework facing the system efficiency of the communication link access resource management is provided in the physical implementation process of the logical architecture, and the physical architecture is defined. Information such as an access request, data volume report, service information and channel quality feedback which are most core in a communication access process is extracted, modules related to resource allocation in an access satellite are defined, core functions such as resource allocation, retransmission processing and channel processing at a ground base station side are designed, and the basis of modeling design and simulation of a satellite communication access system is established.
(3) Compared with the prior art, the method for analyzing the transmission of the satellite communication access system identifies the problem to be analyzed in the process of optimizing the weight of the physical architecture and simulates the problem by using a model-based design methodology and deducing user requirements and a functional architecture. The method defines the connection relation between a user terminal in a satellite communication access system and resource scheduling related modules in an access satellite for the first time, designs a retransmission mechanism optimization model, and optimizes and utilizes satellite-to-satellite limited resources by analyzing and balancing satellite-to-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 schematic logic diagram of the present invention;
FIG. 3 is an exploded view of a node logic architecture according to the present invention;
FIG. 4 is a diagram illustrating the physical architecture definition of the node according to the present invention;
FIG. 5 is a schematic diagram of the problem analysis recognition of the present invention;
FIG. 6 is a logical decomposition-embodiment of the present invention;
FIG. 7 illustrates a node logic architecture decomposition-embodiment-SR transmission according to the present invention;
FIG. 8 illustrates node logical architecture decomposition, embodiment BSR transmission, in accordance with the present invention;
FIG. 9 is a node logical architecture decomposition, embodiment SI transmission, of the present invention;
FIG. 10 is a node logical architecture decomposition-embodiment-CQI transmission of the present invention;
FIG. 11 illustrates the analysis of problem recognition-embodiment-resource allocation in accordance with the present invention;
FIG. 12 illustrates the analysis problem recognition-embodiment-retransmission process of the present invention;
FIG. 13 illustrates the analysis problem recognition-embodiment-channel processing in accordance with the present invention;
FIG. 14 is a diagram of an engineering simulation implementation of the present invention.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The satellite communication access system and the transmission analysis method provided by the embodiments of the present application are further described in detail below with reference to the drawings of the specification, and specific implementation manners 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, evaluation and optimization 5, and requirements tracing 6.
Logical architecture (white-box) analysis 3 includes logical decomposition 31 and logical interaction 32.
The logical architecture decomposition and alternative physical architecture analysis 4 comprises a node logical architecture decomposition 41 and a node physical architecture definition 42 for the satellite communication access system.
The evaluation and optimization 5 comprises an analysis problem identification 51 oriented towards satellite communication access system transmission analysis, an analysis model definition 52 and an engineering simulation execution 53.
In a possible implementation manner, the method specifically includes:
first, stakeholder requirements analysis 1 analyzes application requirements from the perspective of the system stakeholders, forming inputs to system requirements (black box) analysis 2.
Second, system requirements (black box) analysis 2 converts the application requirements of interest to the stakeholders into system requirements that the system builder can directly use to design the system, based on the stakeholder requirements analysis 1.
And thirdly, performing system design by taking the output of the system requirement (black box) analysis 2 as an input of a logic architecture (white box) analysis 3. The satellite communication access system is designed with an architecture and a transmission method aiming at an access link between a user segment and a space segment.
The a logical decomposition 31 is to decompose the logical hierarchy of the system and perform specific logical modeling on the domain range involved in the satellite communication system, as shown in fig. 2. Including user terminals 3101, user link channels 3102, access satellites 3103, satellite networks 3104, feeder link channels 3105, and ground control centers 3106.
The system comprises a user terminal 3101, an access satellite 3103, a satellite load 3110 and a satellite platform 3111 according to a task function and a support function, a satellite network 3104, a signaling connection 3112 and a service transmission 3113 according to the core function, a ground management and control center 3114, a service 3115, a service management 3116, a communication management 3117, a comprehensive operation dimension 3118, a safety protection 3119, a database 3120, a visualization 3121, a system performance module 3122, and requirements and efficiencies 3123 according to the core function of a smooth evolution architecture from a ground fourth generation mobile communication system 4G to a fifth generation mobile communication system 5G and combining the characteristics of a space-based system.
The satellite load 3110 refers to an international standardized open system architecture OSI, combines with the characteristics of a satellite system, and adopts core functions of the lower three layers of the OSI, namely, a network layer, a data link layer and a physical layer, which are divided into a satellite route 3124, a satellite access 3125 and a satellite link 3126. The satellite platform may also be divided into corresponding parts by function.
The b logic interaction 32 is designed to satisfy the system design requirements, and the relationships of activities, interfaces, parameters and the like between elements are designed.
Fourthly, partitioning the logic modules based on the physical positions, organization responsibilities or other distribution standards of the logic modules on the basis of a hierarchical architecture formed by a satellite communication access system logic architecture (white box) analysis 3 by a logic architecture decomposition and alternative physical architecture analysis 4; and defining a physical architecture facing architecture balance optimization problem in the physical implementation process.
The a-node logical architecture decomposition 41 is a logical function part of the logical decomposition 31 for implementing the user segment access space segment, as shown in fig. 3. Including user terminals 4101 and access satellites 4102. Wherein the user terminal 4101 contains parts thereof that implement the access space segment functions: business applications 4103, resource management 4104 and link transport 4105, the access satellite 4102 contains its parts that implement the user segment access functionality: satellite loading 4106. Satellite payload 4106 contains the specific parts that implement the subscriber segment access functionality: satellite link 4107 and satellite access 4108.
The b-node physical architecture definition 42 is a definition of a physical architecture by performing physical architecture trade-off optimization for resource management system performance in a physical implementation process of the logical architecture. As shown in fig. 4. The physical architecture of the resource management module 4204 related to resource allocation in the user terminal 4201 is defined and 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 compatible ground 4G and 5G systems. The physical architecture of the modular satellite access 4208 related to resource allocation in the access satellite 4202 is defined and divided into resource allocation 420801, retransmission processing 420802 and channel processing 420803 based on the core function of the base station side compatible with the terrestrial 4G and 5G systems
Fifth, a transmission analysis method of a satellite communication access system, characterized in that: the method comprises two parts of evaluation and optimization 5 and requirement tracing 6.
And the evaluation and optimization 5 identifies the problem to be analyzed in the balance optimization process of the physical architecture according to the node physical architecture defined in the logic architecture decomposition and alternative physical architecture analysis 4, defines an analysis model and obtains an analysis result through engineering simulation.
a, the 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. First, an access request 510101 and a data volume report 510102 in a user terminal 5101 for realizing a link establishment function must be connected with a resource allocation 510201 module in an access satellite 5102; the traffic 510103 implementing the data transfer function in the user terminal 5101 must be connected to the resource allocation 510201 module in the access satellite 5102. Next, due to various attenuations of channel transmission, the access request 510101, the data volume report 510102, and the traffic information 510103 in the user terminal 5101 need to establish a retransmission mechanism to the access satellite 5102, and through analysis, the number of retransmissions between the optimized access request and the retransmission processing 510202 in the access satellite 5102 is balanced; third, the channel quality status needs to be updated between the ue 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 ue 5101 and the retransmission processing 510202 and the channel processing 510203 in the access satellite 5102 should establish a transmission mechanism, and the number of transmissions or retransmissions is optimized by analysis and trade-off.
b the analysis model definition 52 defines the goals, constraints and design arguments of the analysis problem based on the problem content given by the analysis problem recognition 51. The goals of the analysis problem are: the time delay for signal transmission between the user terminal 5101 and the access satellite 5102, and the system capacity that can be achieved by implementing the retransmission mechanism on the access satellite 5102. The constraints of the analysis problem are: the access request 510101, volume report 510102, traffic information 510103 in the user terminal 5101 must be connected to the resource allocation 510201 module in the access satellite 5102. The design arguments of the analytical 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.
c, the engineering simulation execution 53 carries out multi-objective optimization simulation according to the analysis model definition 52, analyzes an effect value scatter diagram formed by the objective of the framework design optimization, finds the pareto frontier, balances to obtain elite framework points, and provides corresponding design independent variable values to obtain the conclusion of the framework design optimization.
And sixthly, requirement tracing 6 is to compare the result of the system design with the requirement and provide the condition of meeting the requirement.
Logical decomposition embodiments
Fig. 6 shows a specific embodiment of the logical decomposition 31 according to the present invention.
a, the ue 3101 is embodied as: the business application 3107 acts as an interface with the user's usage and interacts the user's requirements with resource management 3108 and then enters the wireless link with the satellite via link transport 3109.
b where the access satellite 3103 is embodied as a satellite-in-satellite link 3110 and its next level components, including a satellite route 3124 for network level protocol functionality, a satellite access 3125 for data link layer functionality, and a satellite link 3126 for physical layer functionality, and then into a wireless link for connection with the user terminal 3101.
The satellite network 3104 abstracts and implements the functions of the satellite in the network into two functional modules, namely a signaling connection 3112 and a service transmission 3113, and realizes the connection during initial link establishment and the transmission function of the user application service respectively.
d where the ground management center 3106 is embodied as six core functional modules related to modeling. Where the services 3115 serve as a direct interface to the management and control center user, providing a user interface and interfacing with the architectural design and control center 3114 through a service management 3116. Meanwhile, the service 3115 provides an interface with the integrated operation 3118 and the security 3119. The system design and control center 3114 is also connected to the integrated operation and maintenance 3118 and the security protection 3119 as a core control module of the whole network. The communication management 3117 provides physical link connectivity with satellite terrestrial gateway stations.
Node logical architecture decomposition-embodiments
The node logical architecture decomposition 41 implements the logical functionality of the user segment access space segment. The method is implemented as a processing process of a main flow of user access in each component of the invention content. The method comprises 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 resource management 4104, and then performs terminal access request link transmission 410501-1 through link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 over the wireless channel, satellite resource allocation link transmission 410701-1 at the physical layer is performed by the satellite link 4107, and then satellite resource allocation 410801-1 is performed by the satellite access 4108. Depending on the channel quality status, the resource management 4104 of the user terminal 4101 may need to perform SR retransmission, i.e. the link transmission 4105 performs terminal access request link retransmission 410501-2, the satellite load 4106 transmitted to the access satellite 4102 via the wireless channel is followed by the satellite link 4107 performing satellite retransmission processing link transmission 410701-2 at the physical layer, and then the satellite access 4108 performs satellite retransmission processing 410801-2.
Data volume report bsr (buffer Status report) transmission: resource management 4104 in the user terminal 4101 proposes a terminal data volume report 410402, and then performs terminal data volume report link transmission 410502-1 through link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 over the wireless channel, the satellite link 4107 performs satellite resource allocation link transmission 410702-1 at the physical layer, and then the satellite access 4108 performs satellite resource allocation 410802-1. Depending on the channel quality status, resource management 4104 of the user terminal 4101 may need to perform BSR retransmission, i.e., terminal data volume report link retransmission 410502-2 by link transmission 4105, satellite retransmission processing link transmission 410702-2 at the physical layer by satellite link 4107 after transmission to satellite payload 4106 of access satellite 4102 over the wireless channel, and then satellite retransmission processing 410802-2 by satellite access 4108.
Service information si (service information) transmission: the service application 4103 in the user terminal 4101 presents terminal service information 410303, the resource management 4104 performs terminal service information resource allocation 410403, and then performs terminal service information link transmission 410503-1 through link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 over the wireless channel, satellite resource allocation link transmission 410703-1 at the physical layer is performed by the satellite link 4107, and then satellite resource allocation 410803-1 is performed by the satellite access 4108. According to the channel quality status, the resource management 4104 of the user terminal 4101 may need to perform SI retransmission, i.e. the link transmission 4105 performs terminal service information link retransmission 410503-2, and after transmitting to the satellite load 4106 of the access satellite 4102 through the wireless channel, the satellite link 4107 performs the physical layer satellite retransmission processing link transmission 410703-2, and then the satellite access 4108 performs the satellite retransmission processing 410803-2. Depending on the retransmission information, the ue 4101 may need to interact with the access satellite 4102 for channel quality status, i.e. the link transmission 4105 of the ue 4101 performs terminal service information channel quality retransmission 410503-3, and after transmitting to the satellite payload 4106 of the access satellite 4102 via a wireless channel, the satellite link 4107 performs physical layer satellite channel processing link transmission 410703-3, and then the satellite access 4108 performs satellite channel processing 410803-3.
Channel Quality feedback cqi (channel Quality information) transmission: resource management 4104 in user terminal 4101 proposes channel quality feedback 410404, and then performs channel quality feedback link transmission 410504-1 via link transmission 4105. After the satellite payload 4106 transmitted to the access satellite 4102 over the wireless channel, the satellite link 4107 performs satellite channel processing link transmission 410704-1 at the physical layer, and then the satellite access 4108 performs satellite channel processing 410804-1. Depending on the channel quality status, the resource management 4104 of the user terminal 4101 may need to perform CQI retransmission, i.e. the link transmission 4105 performs channel quality feedback link retransmission 410504-2, the satellite load 4106 transmitted to the access satellite 4102 via the wireless channel is followed by the satellite link 4107 performing physical layer satellite retransmission processing link transmission 410704-2, and then the satellite access 4108 performs satellite retransmission processing 410804-2.
Node physical architecture definition-embodiments
The definition of the resource management 4204 in the user terminal 4201 and the definition of the satellite access 4208 in the access satellite 4202 according to the node physical architecture definition 42, where the specific implementation of the node physical architecture definition 42 is given according to the main index delay and capacity that needs to be optimized for the architecture design
For time delay, define the processing delay unit parameters for satellite-to-ground transmission delay unit, terminal and satellite for every 1Mbps data:
the satellite-ground transmission delay unit is 9 milliseconds;
the SR processing time delay unit is 0.2 millisecond;
the time delay unit for BSR processing is 0.4 milliseconds;
the SI processing time delay unit is 1 millisecond;
the CQI processing delay unit is 0.5 ms.
For capacity, defining the bit error rate reduction brought by satellite-to-ground retransmission or channel quality feedback, and the capacity improvement index brought by the bit error rate reduction:
the SR retransmission capacity improvement index is 1.01;
the BSR retransmission capacity boost index is 1.56;
the SI retransmission capacity improvement index is 1.43;
CQI capacity retransmission index of 1.29
Analysis problem identification-embodiment
The function of the user terminal 5101, which needs to clarify the transmitted information for problem analysis and identification, is specifically implemented as follows:
a access request 510101: the user terminal 5101 informs 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 of uplink 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 volume 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 to the access satellite 5102 and determines whether retransmission is required depending on whether data is successfully received.
The analysis of the access satellite 5102 identifies the processing function related to the user access, which needs to be clearly performed, and is implemented as follows:
a for resource allocation 510201 of the access satellite 5102, a connection interface with at least one transmission of an access request 510101, a data volume report 510102 and traffic information 510103 of a user terminal 5101 is shown as a solid line connection in fig. 11.
b for the retransmission process 510202 of the access satellite 5102, the connection interface with the access request 510101 of the user terminal 5101, the data volume report 510102, the traffic information 510103 and the channel quality feedback 510104 has 0 or more transmissions, as shown by the dashed connection in fig. 12.
c for channel processing 510203 of the access satellite 5102, there are connection interfaces with traffic information 510103 and channel quality feedback 510104 of the user terminal 5101 with 0 or 1 transmission, as shown by the dashed line connection in fig. 13.
Analytical model definition-example
According to the analysis problem recognition in the technical solution, for four "activity graphs" embodied in the node logical architecture decomposition: SR transmission, BSR transmission, SI transmission and CQI transmission, and respectively calculate user link time delay and user link capacity. The architectural design options for SR transmission, BSR transmission, and SI transmission are embodied as 6, and the architectural design options for CQI transmission are embodied as 7.
The combination of multiple options results in a trade-off space size of 6 x 3 x 7-1512.
Engineering simulation execution-embodiment
Analyzing a two-dimensional graph of the framework balance space, finding out the pareto front edge, expanding the pareto front edge to form a fuzzy pareto front edge, analyzing the characteristics of the framework in the fuzzy pareto front edge, finding out an elite framework type, and carrying out balance decision on satellite-to-ground link delay and capacity. After the engineering simulation of the analysis problem is implemented, the simulation result as shown in fig. 14 is obtained.
From the trade-off space obtained from the simulation, it can be seen that the architectures scatter to form clusters, and all the clusters form an architecture set in the form of an index. The data is analyzed to obtain the result that,
a) for each mechanism needing retransmission design, the architectures with similar or same retransmission times can more easily obtain better time delay and capacity performance,
b) in each cluster, architectures with medium and close retransmission times have better capacity performance.
c) In each layered architecture, the architecture with higher SR and BSR retransmission times has better delay performance. This means that in the architecture design process, designing more retransmission times in the link establishment process will result in better delay performance.
Requirement tracing-examples
According to the relation between the design and the requirement, a requirement satisfaction degree matrix is given as shown in the following table. All requirements are embodied in the respective design elements. For the transmission analysis of the satellite communication access system, the transmission analysis is related to a user terminal and an access satellite in design, and the balance analysis result of the physical design of the architecture module is traced back to the analysis background to reflect the satisfaction degree of the analysis requirement.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A satellite communication access system and a transmission analysis method are characterized by comprising the following steps:
step 1, analyzing application requirements of satellite communication;
step 2, converting the application requirements into system requirements for designing a system according to the application requirement analysis result;
step 3, according to the system requirements, aiming at an access link between the user section and the space section, constructing a framework and a transmission method of the satellite communication access system to form a satellite communication access system hierarchical framework;
step 4, partitioning the logic modules based on the physical positions, organization duties or other distribution standards of the logic modules of the satellite communication access system on the basis of the hierarchy architecture of the satellite communication access system; determining a node physical architecture facing to architecture balance optimization problem in the physical implementation process;
step 5, identifying the problem to be analyzed in the balance optimization process of the physical architecture 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 requirement satisfaction conclusion.
2. The satellite communication access system and the transmission analysis method according to claim 1, wherein the step 3 specifically includes: logical decomposition and logical interaction.
3. The satellite communication access system and the transmission analysis method according to claim 2, wherein the logical decomposition is used for decomposing the logical hierarchy of the system and performing specific logical modeling on the domain range involved in 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 control center;
the user terminal is divided into service application, resource management and link transmission according to core functions, the access satellite is divided into a satellite load and a satellite platform according to task functions and support functions, the satellite network is divided into signaling communication and service transmission according to the core functions, the ground management and control center refers to the core functions of a smooth evolution architecture of a ground fourth generation mobile communication system to a fifth generation mobile communication system and combines the characteristics of a space-based system to divide the system into a system design and control center, a service, service management, communication management, comprehensive operation and maintenance, safety protection, a database, visualization, a system performance module, requirements and efficiency.
4. The satellite communication access system and transmission analysis method of claim 2, wherein: the logical interaction is used for designing the relationships of activities, interfaces and parameters among elements with the aim of meeting the design requirements of the system.
5. The satellite communication access system and the transmission analysis method according to claim 1, wherein the step 4 specifically includes: node logical architecture decomposition and node physical architecture definition.
6. The satellite communication access system and transmission analysis method of claim 5, wherein: the node logic architecture decomposes logic functions 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 thereof for implementing the access space segment function: service application, resource management and link transmission, the access satellite comprises a part for realizing the access function of a user section: the satellite load. The satellite load comprises the specific parts for realizing the user segment access function: satellite links and satellite access.
7. The satellite communication access system and transmission analysis method of claim 5, wherein: the node physical architecture definition is used for carrying out physical architecture balance optimization facing the efficiency of a resource management system in the physical implementation process of the logic architecture and defining the physical architecture; a physical framework of module resource management related to resource allocation in a user terminal is defined, and the physical framework is divided into an access request, a data volume report, service information and channel quality feedback based on core functions of a user side compatible with a ground 4G system and a ground 5G system. A 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 core functions of a base station side compatible with a ground 4G system and a ground 5G system.
8. The satellite communication access system and the 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 a user terminal and a resource scheduling related module in an access satellite; the method specifically 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, an access request, a data volume report and service information in the user terminal establish a retransmission mechanism to the access satellite, and retransmission times between optimization and retransmission processing in the access satellite are balanced through 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 processing and channel processing in the access satellite should establish a transmission mechanism, and the number of transmission or retransmission times is balanced and optimized through analysis.
9. The satellite communication access system and transmission analysis method of claim 1, wherein the defining the analysis model comprises: identifying given problem content according to the analysis problem, and defining the target, constraint and design independent variable of the analysis problem; the targets of the analytical questions were: 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; the constraints of the analysis 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 were: access request transmission times, data volume report transmission times, service information transmission times and channel quality feedback transmission times.
10. The satellite communication access system and the transmission analysis method according to claim 1, wherein the engineering simulation comprises: and performing multi-objective optimization simulation according to the definition of the analysis model, analyzing an effect value scatter diagram formed by the objective of the architecture design optimization, finding a pareto frontier, balancing to obtain an elite architecture point, and giving a corresponding design independent variable value to obtain a conclusion of the architecture design optimization.
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| CN114915991A (en) * | 2022-05-11 | 2022-08-16 | 军事科学院系统工程研究院网络信息研究所 | Multi-satellite multi-gateway satellite mobile communication system load balancing system architecture and method |
| CN115118327A (en) * | 2022-06-17 | 2022-09-27 | 中国人民解放军军事科学院系统工程研究院 | Satellite communication resource scheduling method and system based on dynamic measurement feedback |
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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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| 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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