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GB/T 39723-2020 English PDF

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GB/T 39723-2020: Technical specification for communication network system of BeiDou ground-based augmentation system
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Basic data

Standard ID: GB/T 39723-2020 (GB/T39723-2020)
Description (Translated English): Technical specification for communication network system of BeiDou ground-based augmentation system
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: U65
Classification of International Standard: 47.020.70
Word Count Estimation: 19,184
Date of Issue: 2020-12-14
Date of Implementation: 2021-07-01
Quoted Standard: GB/T 22239; GB/T 32402; GB/T 39267-2020
Regulation (derived from): National Standard Announcement No. 28 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the system architecture of the Beidou ground-based enhancement system communication network system, the overall design of the data return network, the data return network function, the data return network performance, the function performance of the data broadcast network, the function performance of the service access network, and the acceptance Contents and technical requirements of tests, test methods, test evaluation criteria and result records, test acceptance and delivery materials. This standard applies to the construction and acceptance of the Beidou Ground-based Augmented System communication network system (hereinafter referred to as the communication network system).

GB/T 39723-2020: Technical specification for communication network system of BeiDou ground-based augmentation system

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Technical specification for communication network system of BeiDou ground-based augmentation system ICS 47.020.70 CCSU65 National Standards of People's Republic of China Technical specification for communication network system of Beidou ground-based augmentation system 2020-12-14 release 2021-07-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Preface Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 1 3 Terms, definitions and abbreviations 1 3.1 Terms and definitions 1 3.2 Abbreviations 1 4 System architecture 2 4.1 Overall Architecture 2 4.2 Data return network 2 4.3 Data Broadcasting Network 2 4.4 Service access network 2 5 Overall design of data return network 3 5.1 Network topology design 3 5.2 Transmission link design 4 5.3 Route planning 4 5.4 Security 5 6 Data return network function 5 6.1 Network transmission 5 6.2 Network configuration and monitoring 5 6.3 Network transmission link 5 6.4 Cybersecurity and confidentiality 5 7 Data return network performance 6 7.1 Network equipment performance 6 7.2 Network bandwidth 6 7.3 Network delay 6 7.4 Network availability 6 7.5 Cybersecurity and confidentiality 7 8 Functional performance of data broadcasting network 7 9 Functional performance of service access network 7 10 Acceptance test 7 10.1 Purpose of acceptance test 7 10.2 Timing of Acceptance Test 7 10.3 Acceptance test items 7 10.4 Testing and acceptance 8 11 Test method 8 11.1 Network transmission test method 8 11.2 Network configuration and monitoring test method 8 11.3 Network transmission link test method 8 11.4 Network equipment performance test method 8 11.5 Network bandwidth test method 9 11.6 Network delay test method 9 11.7 Test method of network availability 9 11.8 Network security performance test methods 9 12 Test evaluation criteria and result records 9 12.1 Network transmission test evaluation criteria and result records 9 12.2 Network configuration and monitoring test evaluation criteria and result records 10 12.3 Network transmission link function test evaluation criteria and result records 10 12.4 Network equipment performance test evaluation criteria and result records 10 12.5 Network bandwidth test and evaluation criteria and result records 11 12.6 Network delay test evaluation criteria and result records 11 12.7 Network availability test and evaluation criteria and result records 11 12.8 Network security performance test evaluation criteria and result records 12 13 Test and acceptance documents 12 13.1 Test acceptance data 12 13.2 Test and Acceptance Software Documentation 13

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 Standardization Guidelines Part 1.Structure and Drafting Rules of Standardization Documents Drafting. Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the Equipment Development Department of the Central Military Commission. This document is under the jurisdiction of the National Beidou Satellite Navigation Standardization Technical Committee (SAC/TC544). Drafting organizations of this document. China Ordnance Industry Standardization Institute, Qianxun Position Network (Zhejiang) Co., Ltd., Wuhan University, China Ordnance Scientific Research Institute, Northern Information Control Research Institute Group Co., Ltd. The main drafters of this document. Mai Lubo, Xu Chuan, Wang Yichuan, Li Geyang, Xu Hui, Zhang Hongbing, Lou Yidong, Lou Haoyu, Xu Xueyong, Wang Qingtai.

Introduction

The Beidou ground-based augmentation system is an important national information infrastructure, used to provide high-precision positioning services, mainly composed of reference station networks, communication Network system, data processing center, operation service platform, data broadcasting system, user terminal, information security protection system, backup system, etc. composition. The Beidou ground-based augmentation system receives navigation signals transmitted by navigation satellites through several reference stations established on the ground at a certain distance. The information network is transmitted to the data processing center, and after processing, the orbit correction number, clock correction number, ionospheric correction number, and regional difference of the navigation satellite are generated. Data, millimeter-level post-processing data and other data products are broadcast through satellite, digital network (mobile communication network, Internet, etc.), digital broadcasting, etc. It provides download services of post-processing data products through the Internet to meet the wide-area meter and decimeter level within the service range of the Beidou foundation enhancement system Real-time positioning and navigation requirements at the centimeter level, regional centimeter level, and post-processing millimeter level positioning service requirements. In order to systematically optimize, upgrade and solidify the Beidou ground-based enhancement system base station, communication network, data processing, data interface, data broadcast The main technologies such as development and operation services have enabled these technologies to provide technical support and beneficial guidance for similar construction projects at home and abroad, and have established the "Beidou Technical Specifications for the Construction and Acceptance of Base Stations of the Foundation Augmentation System Part 1.Construction Specifications Acceptance Technical Specifications Part 2.Acceptance Specifications" "Beidou Ground-based Augmentation System Communication Network System Technical Specifications" "Beidou Ground-based Augmentation System Number According to the technical requirements of the processing center", "Satellite Navigation Ground-based Augmentation System Data Processing Center Data Interface Specification", "Satellite Navigation Ground-based Augmentation System Broadcast Transmission Interface Specification Part 1.Mobile Communication Network "Satellite Navigation Ground-based Augmentation System Broadcast Interface Specification Part 2.China Mobile Multimedia Broadcasting” “Satellite Navigation Ground-based Augmentation System Broadcast Interface Specification Part 3.FM Band Digital Audio Broadcasting” “Beidou Ground-based Augmentation System The Beidou Ground-based Enhancement System is a series of standards that support each other, coordinate and support each other, which is composed of national standards such as "Technical Requirements for Access to the Network of Standard Reference Stations". This document systematically stipulates the content of the communication network of the Beidou ground-based augmentation system, which is the communication network of the base station of the Beidou ground-based augmentation system. Provide basis for network construction and acceptance. Technical specification for communication network system of Beidou ground-based augmentation system

1 Scope

This document specifies the system architecture, the overall design of the data return network, and the data return network of the Beidou ground-based enhanced system communication network system Function, data return network performance, data broadcast network function performance, service access network function performance, acceptance test, test method, test Contents and technical requirements of test evaluation criteria and result records, test acceptance and delivery materials. This document is applicable to the construction and acceptance of Beidou Ground-based Augmentation System communication network system (hereinafter referred to as communication network system).

2 Normative references

The contents of the following documents constitute indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 22239 Information Security Technology Network Security Level Protection Basic Requirements GB/T 32402 Communication Terms Data Communication Internet GB/T 39267-2020 Beidou satellite navigation terminology 3 Terms, definitions and abbreviations 3.1 Terms and definitions The terms and definitions defined in GB/T 39267-2020 and GB/T 32402 apply to this document. 3.2 Abbreviations The following abbreviations apply to this document.

4 System architecture

4.1 Overall architecture The overall architecture of the communication network system is composed of three parts. data return network, data broadcast network and service access network. The communication network system The architecture diagram is shown in Figure 1. 4.2 Data return network It is composed of a two-way link communication network connecting the reference station and the monitoring station to the data processing center. The data backhaul network is mainly based on Beidou The base station of the enhanced system transmits satellite observation data and operation and maintenance monitoring data, and receives enhanced data products for the monitoring station and transmits positioning data And monitoring data to provide communication network. 4.3 Data Broadcasting Network It is composed of one-way and two-way link communication network from the data processing center to the broadcasting system to the user. The data broadcast network is mainly for the North The bucket ground-based augmentation system broadcasts satellite guidance to users through satellite, digital network (mobile communication network, Internet, etc.), digital broadcasting and other broadcasting methods. Aviation enhanced data products to provide communication networks. 4.4 Service access network It consists of a two-way link communication network from the data processing center to the backup system and the operation service platform. The service access network is mainly Back up data to the backup system for the data processing center, support data recovery and use when needed, and provide data processing for the operation service platform The communication network through which the heart or data processing center transmits operation service-related data to the operation service platform.

5 Overall design of data return network

5.1 Network topology design 5.1.1 Network design should follow practicality, advancement, high reliability, standardization, openness, flexibility, scalability, ease of operation, and manageability Principles of rationality and economy. 5.1.2 The communication network system adopts a two-layer or three-layer star network architecture design. For the topology relationship of the two-layer star network architecture of the communication network system, see Figure 2.The topological relationship of the three-layer star network architecture of the communication network system is shown in Figure 3. 5.1.3 The two-layer star network architecture design is divided into the core layer and the base station access layer. The core layer is the data processing center and the access layer is the base layer. Quasi station or monitoring station. 5.1.4 The three-layer star network architecture design is divided into core layer, convergence layer and access layer. The core layer is the data processing center and the convergence layer is the ground. In the area convergence center, the access layer is the base station or monitoring station. 5.1.5 The core layer and convergence layer should adopt a dual-backup redundant architecture (including routers, etc.). 5.1.6 The access layer should adopt a router with security protection. 5.1.7 The core layer and the convergence layer should be connected by at least two independent mutual backup transmission links. 5.1.8 Below the convergence layer, the number of connected transmission links should be selected based on the actual situation. Figure 3 Topological diagram of three-layer star network architecture of communication network system 5.2 Transmission link design 5.2.1 The link should use a reliable carrier's dedicated line or other securely encrypted lines. 5.2.2 The transmission link bandwidth from the access layer to the convergence layer or from the access layer to the core layer should be selected according to the actual data bandwidth requirements. At 2Mbps. 5.2.3 The link type should select reliable SDH, MSTP dedicated lines, and links with corresponding data scale bandwidth. 5.2.4 The transmission link bandwidth from the core layer to the convergence layer should be selected according to the actual data bandwidth requirements, and should not be less than 10Mbps. 5.3 Route planning 5.3.1 Main route planning 5.3.1.1 A dynamic routing protocol shall be used within the core layer of the communication network system, from the core layer to the convergence layer. 5.3.1.2 Dynamic routing protocol or static routing protocol can be used within the convergence layer, from the core layer to the access layer, and from the convergence layer to the access layer. 5.3.1.3 OSPF or BGP protocol can be used within the core layer, from the core layer to the convergence layer. 5.3.1.4 OSPF or static routing protocols can be used within the convergence layer, from the core layer to the access layer, and from the convergence layer to the access layer. 5.3.2 Auxiliary routing line planning The auxiliary route plan is designed with reference to the main route plan. 5.3.3 IP address planning 5.3.3.1 The planning and division of IP addresses should meet the requirements of the Beidou Foundation Enhancement System for IP addresses in the current project and the needs of future development. If necessary, the corresponding address segment should be reserved for future business development. 5.3.3.2 CIDR technology should be used to reduce the size of the router routing table, speed up the convergence speed of router routing, and reduce broadcasts in the network. The size of the routing information. 5.3.3.3 VLSM technology should be used in the allocation of IP addresses to ensure the efficiency of IP address utilization. 5.3.3.4 The address segments of various places shall be allocated according to the size of the business volume. 5.3.3.5 IP address allocation should try to allocate continuous IP address space to each base station; in each base station, the same business and The function should try to allocate continuous IP address space. 5.4 Security and confidentiality 5.4.1 Communication network security should meet the requirements of GB/T 22239 for network security protection level 3 and above. 5.4.2 The security of the communication network system is divided into three parts. data security, link security and access security. 5.4.3 Data management shall comply with relevant national data security and confidentiality requirements. For mobile broadcast and RTK and applications involving two-way communication Users must have measures to ensure the security and confidentiality of the data processing center. 5.4.4 Data transmission should be carried out using dedicated channel dedicated line of the operator, or other securely encrypted lines. Secure encryption The algorithm is in accordance with relevant regulations. 5.4.5 For the network equipment used in the network system, the access rights should be strictly controlled, weak passwords should be avoided, and login accounts should be changed regularly information. 5.4.6 The data access in the network system should be controlled, access control strategies should be deployed, and invalid access rights to the base station should be closed.

6 Data return network function

6.1 Network transmission 6.1.1 The core layer and convergence layer network equipment should be able to support the operation of static routing, OSPF, BGP, and multicast protocols. 6.1.2 The access layer network equipment can support static routing and OSPF protocol. 6.1.3 The core layer, convergence layer, and access layer network equipment should have network transmission security functions. 6.2 Network configuration and monitoring 6.2.1 The network equipment should be able to be remotely logged in and configured. 6.2.2 The network system should be monitored and can automatically alert when an abnormality occurs. 6.3 Network transmission link 6.3.1 It has basic data packet transmission function, and does not filter general network protocols. 6.3.2 The bandwidth of the transmission link can be flexibly expanded as needed. 6.4 Network security and confidentiality 6.4.1 The transmission line should have the ability to support security services, and should be able to support channel exclusive or support encryption through security algorithms. 6.4.2 Network equipment should have security service functions, should be able to support access control strategies and strong password settings.

7 Data return network performance

7.1 Network equipment performance 7.1.1 Core layer network equipment The core network equipment should be a reliable high-end router or a three-layer switch, and the technical indicators should meet the following requirements. a) The maximum throughput is not less than 273Gbps; b) The packet forwarding rate is not less than 460Mpps; c) The main control switch card, power supply, and interface module should be hot-swappable; d) The main control switch card, switch network board, power supply, and fan of key components should support 11 redundant backup; e) The reliability of the equipment is not less than 0.99999; f) MTBF is not less than 10000h; g) The forwarding delay is less than 1ms. 7.1.2 Convergence layer network equipment The convergence layer network equipment should be a reliable mid-range router or a three-layer switch, and the technical indicators should meet the following requirements. a) The maximum throughput is not less than 50Gbps; b) The packet forwarding rate is not less than 100Mpps; c) The reliability of the equipment is not less than 0.99999; d) MTBF is not less than 10000h; e) The forwarding delay is less than 1ms. 7.1.3 Access layer network equipment The access layer network equipment should be a reliable router or firewall, and the technical indicators should meet the following requirements. a) The maximum throughput is not less than 5Gbps; b) The reliability of the equipment is not less than 0.99999; c) MTBF is not less than 10000h; d) The forwarding delay is less than 1ms. 7.2 Network bandwidth The network bandwidth should meet the following requirements. a) The access layer bandwidth is not less than 2Mbps; b) The link bandwidth from the core layer to the convergence layer should be selected according to the actual data bandwidth requirements, at least 10Mbps. 7.3 Network delay The network delay should meet the following requirements. a) The total delay from the reference station to the data processing center should not be greater than 500ms; b) The number of qualified lines with network delay should not be less than 95% of the total number. 7.4 Network availability 7.4.1 The availability rate of a single transmission link has an average packet loss rate of less than 1%. 7.4.2 The overall availability rate of the......

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