GB/T 50760-2021 English PDFUS$1579.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 50760-2021: Code for engineering technology of digital trunking communication Status: Valid GB/T 50760: Historical versions
Basic dataStandard ID: GB/T 50760-2021 (GB/T50760-2021)Description (Translated English): Code for engineering technology of digital trunking communication Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P76 Word Count Estimation: 79,735 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation GB/T 50760-2021: Code for engineering technology of digital trunking communication---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This specification is formulated for the purpose of standardizing the engineering construction, operation and maintenance of 800MHz digital trunking networks of various standards in my country, and promoting the healthy and orderly development of digital trunking private networks and shared networks. 1.0.2 This specification applies to new construction, reconstruction and expansion of 800MHz digital trunking network [including digital trunking system (A), digital trunking system (B), digital trunking based on Global System for Mobile Communications (GSM) technology, and based on CDMA (CDMA) technology digital trunking] planning, design, construction, engineering acceptance and operation and maintenance. 1.0.3 Digital trunking network is suitable for dispatching network, not suitable for use as public mobile phone network. 1.0.4 When preparing to build a digital trunking network, it is advisable to build a digital trunking shared network in order to fully utilize frequency resources and save investment. 1.0.5 The engineering construction of the digital trunking network should make full use of the existing public infrastructure such as municipal administration and communication, so as to reduce the construction cost and improve the economic benefits. 1.0.6 The engineering construction of digital trunking network should pay attention to energy saving, emission reduction and environmental protection. 1.0.7 The frequency used by the digital trunking network must be approved by the national or provincial radio management agency. The transmission equipment used must have the "Radio Transmission Equipment Type Approval Certificate" issued by the national radio management agency. 1.0.8 The engineering construction of the digital trunking network shall not only implement this specification, but also comply with the current relevant national standards. 2 Terms and symbols2.1 Terminology 2.1.1 trunking communication system Refers to a mobile communication system in which multiple users share a set of wireless channels and use these channels dynamically, mainly for dispatching communication. Including analog trunking communication system and digital trunking communication system. 2.1.2 digital trunking communication network digital trunking communication network Trunking communication network composed of digital trunking communication system, referred to as digital trunking network in this specification. 2.1.3 single area network single area network It is composed of a basic trunking communication system. There is a mobile exchange (or system control center) and several base stations in the network, including two structures. single-zone single-base station network and single-zone multi-base station network. 2.1.4 area network district area network It is a multi-zone cluster communication network formed by connecting multiple single-zone networks through the regional control center (or the system control centers are connected to each other), and the network has the function of automatic roaming or semi-automatic roaming. 2.1.5 call-loss system When the traffic channel of the system is fully busy, the new call application will be lost, and the user must re-apply for the call. 2.1.6 Waiting system call-delay system When the traffic channels of the system are all busy, new call applications will enter the waiting queue. Once a free channel appears, the system will assign channels according to the principle of first-come-first-served. 2.1.7 time-limit talk In order to ensure the effective use of the channel and shorten the waiting time, the system can use mandatory methods to limit the call time, and the time limit parameters can be adjusted by the system administrator. 2.1.8 dynamic regrouping According to business needs, system administrators can reorganize certain users from different groups into a temporary group for communication. 2.1.9 probability of call-delay In a waiting system, the probability that a user's call is blocked and the call is delayed. 2.1.10 control center control center The control center includes a system controller and a system management terminal, which mainly controls and manages the operation, exchange and connection of the entire trunking communication system. 2.1.11 Scope of base station coverage The area covered by a base station. 2.1.12 cluster private network professional trunking network The unit or department has a working frequency and a non-operating cluster communication network with a full set of network equipment. 2.1.13 common trunking network A trunked communication network that can be commercially operated is established by multiple units or departments to share frequencies and network infrastructure, and with the permission of the telecommunications management department. 2.2 Symbols AAA - authentication, authorization and accounting (Authentication, Authorization, Accounting); AC - Authentication Center (Authentication Center); BSC——Base Station Controller (Base Station Controller); BTS——Base Transceiver Station (Base Transceiver Station); CDMA - code division multiple access (Code Division Multiple Access); DCC - Dispatch Control Center (Dispatch Control Center); DHR——Dispatch Home Register; FE - Fast Ethernet (Fast Ethernet); GE - Gigabit Ethernet (Gigabit Ethernet); GSM—Global system for mobile communications; GPS - Global Positioning System (Global Positioning System); GCR - Group Call Register (Group Control Register); GGSN——Gateway GPRS Support Node (Gateway GPRS SupportNode); HLR - Home Location Register (Home Location Register); IP - Internet Protocol (Internet Protocol); MS - Mobile Station (Mobile Station); MSC - Mobile Switching Center (Mobile Switching Center); MPC - Mobile Position Center (Mobile Position Center); OMC - Operation and Maintenance Center PAMR——Public Access Mobile Radio; PCU——packet control unit (Packet Control Unit); PDSN - Packet Data Serving Node (Packet Data Serving Node); PDE - Position Determining Entity (Position Determining Entity); PMR - cluster private network (Private Mobile Radio); PN——pseudo-noise (Pseudo-Noise); PTT - push to talk (Push To Talk); SCP——Service Control Point (Service Control Point); SSP - Service Switching Point (Service Switching Point); SGSN——Serving GPRS Support Node (Serving GPRS Support Node); SMC - Short Message Center (Short Message Center); SME - short message entity (Short Message Entity); VLR - Visited Location Register.3 Digital trunking network planning3.0.1 Digital trunking network planning should follow the following principles. 1 Business forecasting should be carried out according to the economic development status of each region and the communication development plan of each department, and the network organization plan should be determined; 2 When connecting to the public telephone network, it should meet the network access requirements of the local telephone network; 3 When composing a regional network, the functions of cross-region dispatching communication and roaming communication should be considered; 4 Carry out technical and economical comparison of various schemes to achieve advanced technology, reasonable economy, safety and reliability. 3.0.2 In the digital trunking network planning, the requirements of business development on network structure, network coverage, network capacity configuration and network service quality should be considered. 3.0.3 Digital trunking network planning should estimate the number of base stations based on short-term and long-term development plans, user distribution density, service area range, base station parameters, and terrain environment. 3.0.4 Channel planning should take into account the rationality of the current project and the rationality of the channel configuration of new base stations for future network development.4 Digital trunking network design4.1 Basic design requirements 4.1.1 The design of digital trunking network should meet the requirements of construction objectives such as coverage, capacity, quality and investment. 4.1.2 The digital trunking network should mainly focus on dispatching services within the network, supplemented by Internet telephone services, and can also transmit data services such as data, images and faxes. 4.1.3 The dispatching service shall adopt the half-duplex working mode, and the Internet telephone service shall adopt the full-duplex working mode. 4.1.4 The digital trunking private network should be connected to the private telephone network of the unit or department. Under the condition of meeting the network access requirements of the public telecommunication network, it can be directly or indirectly connected to the public telecommunication network through subscriber lines or trunk lines. The digital trunking shared network should be directly connected with the public telecommunication network. 4.1.5 The business model should be based on the traffic statistics analysis or forecast of the digital trunked network in the current period, and comprehensively consider the dispatching business, interconnected telephone and data business factors. 4.1.6 The digital trunking network shall adopt one of the four digital trunking systems promulgated by the state for networking, and the network structure of the four digital trunking systems shall comply with the provisions of Appendix A of this specification. 4.2 Network Quality of Service 4.2.1 The outdoor wireless communication rate at the edge of the base station coverage area should be selected according to Table 4.2.1. 4.2.2 When performing base station coverage prediction, the dynamic sensitivity of digital trunking receivers should be selected according to the following requirements. 1 For the digital trunking system (A), the base station should be higher than or equal to -106dBm; the mobile station should be higher than or equal to -103dBm; 2 For the digital trunking system (B), the base station should be higher than or equal to -105dBm; the mobile station should be higher than or equal to -102dBm; 3 For digital trunking based on Global System for Mobile Communications (GSM) technology, the base station should be higher than or equal to -104dBm; the mobile station should be higher than or equal to -102dBm; 4 For digital trunking based on CDMA technology, the base station should be higher than or equal to -105dBm; the mobile station should be higher than or equal to -104dBm, and the Ec/Io of the pilot signal should be greater than or equal to -12dB. 4.2.3 For the call loss system, the wireless access quality requirements should meet the following requirements. 1 For the dispatching service, the call loss rate of the wireless channel should be 5% to 10%; 2 For the Internet telephone service, the value of wireless channel call loss rate should be 2% to 5%. 4.2.4 For the waiting system, the wireless access quality requirement should satisfy that the call delay probability is less than 30%. 4.2.5 The call loss rate of low call loss trunk circuit should not be greater than 1%, and the call loss rate of high efficiency direct circuit should not be greater than 7%. 4.3.6 When the digital trunked network is connected to the public telephone network, it shall comply with the current industry standard "Interface Technical Requirements for Accessing the Private Mobile Communication System to the Public Telephone Automatic Switching Network" GF 005.Calls between incoming and outgoing calls are billed. 4.3.7 Master-slave mode should be used to achieve synchronization in the digital trunking network. when connected to the public telephone network, it should be synchronized with the public telephone network. 4.4 Wireless Network Design 4.4.1 The design of digital trunked wireless network should follow the following basic steps. 1 Collect basic data; 2 Clear design goals. including coverage goals, capacity goals, quality goals and investment cost goals; 3 Wireless coverage design. including propagation model selection and correction, wireless link budget, base station coverage prediction and base station, base station controller initial layout plan; 4 Wireless capacity design. including traffic distribution prediction and capacity initial configuration of base station and base station controller; 5 frequency allocation and interference analysis; 6 System simulation. including frequency planning (or PN code offset planning), interference analysis and detailed coverage prediction, etc.; 7 Simulation evaluation. judge whether the simulation results meet the requirements of the design goals; 8 Optimizing and adjusting the initial layout and capacity configuration scheme of base stations and base station controllers; 9 Investigate and select the site of the base station and base station controller; 10 Determine the final solution. 4.4.2 The wireless coverage design should follow the following basic steps. 1 Select the propagation model and perform propagation model correction; 2 Calculate the wireless propagation path loss through the link budget; 3 Predict base station coverage; 4.According to the design goal, determine the initial setting scheme of base station and base station controller; 5 Frequency or PN code offset multiplexing scheme; 6 system simulation; 7.Adjust the initial base station setting scheme according to the simulation results; 8 On-site investigation to determine the specific site location; 9 Adjust the initial base station setting scheme according to the actual site site. 4.4.3 The digital trunking wireless network shall adopt a cellular structure. 4.4.4 Parameters such as base station antenna height, antenna type, antenna direction angle, and pitch angle should be determined based on the principle of meeting the coverage target and reducing interference. 4.4.5 The design of the wireless coverage area should consider balancing the uplink and downlink wireless links and expanding the communication range of the terminal, and the following measures can be adopted. 1 The base station can adopt diversity reception; 2.When the uplink is limited and the feeder between the antenna and the base transceiver station is long, a tower mount amplifier can be installed; 3 The base station can use receiving and transmitting antennas with different gains, and the receiving antenna can use high-gain directional antennas. 4.4.6 The design of the wireless repeater should meet the requirements of Article 4.2.6 of this specification on the interference index, and should be combined with the selected equipment, taking into account the impact of delay and the isolation index of sending and receiving. The gain setting of the repeater should be lower than Repeater transceiver isolation 10dB. 4.4.7 At the junction of provinces/prefectures (cities), the base stations set up should avoid using omnidirectional stations or alpine stations, and attention should be paid to adjusting the base station antenna height, azimuth angle and elevation angle to limit the coverage of border base stations to local within the region. 4.4.8 Wireless capacity design should follow the following basic steps. 1 Clarify the capacity demand target; 2 According to the business model, predict the traffic volume and data traffic density in the coverage area; 3 Predict the traffic and data traffic absorbed by each base station; 4 Determine the equipment configuration of the base station and base station controller; 5 Determine network interface transmission circuit requirements. 4.4.9 The number of base stations shall be determined according to the coverage requirements, capacity requirements, user density distribution, base station link budget and terrain features during the digital trunking network project period. 4.4.10 The capacity configuration of the base station should meet the business forecast requirements of the current period, and the influence of single call scheduling, group call scheduling, interconnected telephone and various data services on channel configuration should be considered. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50760-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 50760-2021_English as soon as possible, and keep you informed of the progress. 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