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Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 38618-2020: Information technology - Telecommunications and information exchange between systems - Specification for high reliability and low latency wireless network communication protocol Status: Valid
Basic dataStandard ID: GB/T 38618-2020 (GB/T38618-2020)Description (Translated English): Information technology - Telecommunications and information exchange between systems - Specification for high reliability and low latency wireless network communication protocol Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: L79 Classification of International Standard: 35.110 Word Count Estimation: 34,343 Date of Issue: 2020-04-28 Date of Implementation: 2020-11-01 Quoted Standard: GB 15629.11-2003; GB/T 15629.15-2010; GB/T 26790.1-2011; IEEE 802.15.4-2011 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the operating frequency range, radio frequency requirements and services of the physical layer of wireless communication networks in high-reliability and low-latency application scenarios, as well as the data link layer reference architecture, MAC layer functions, precise time synchronization, and data link sublayer functions. And adaptive channel hopping and deterministic scheduling. This standard applies to the planning, deployment and implementation of wireless networks in industrial field applications. GB/T 38618-2020: Information technology - Telecommunications and information exchange between systems - Specification for high reliability and low latency wireless network communication protocol---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. Information technology - Telecommunications and information exchange between systems - Specification for high reliability and low latency wireless network communication protocol ICS 35.110 L79 National Standards of People's Republic of China Telecommunication and information exchange between information technology systems High-reliability and low-latency wireless network communication protocol specification 2020-04-28 released 2020-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Abbreviations 3 5 Overview 4 6 Physical layer 5 6.1 Overview 5 6.2 Operating frequency range 5 6.3 Physical layer RF requirements 6 6.4 Physical layer service specification 8 7 Data link layer 21 7.1 Data link layer reference model 21 7.2 MAC layer 22 7.3 Data link sublayer 25 Reference 30 Telecommunication and information exchange between information technology systems High-reliability and low-latency wireless network communication protocol specification1 ScopeThis standard specifies the operating frequency range, radio frequency requirements and services of the physical layer of wireless communication networks in high-reliability and low-latency application scenarios. And data link layer reference architecture, MAC layer functions, precise time synchronization, data link sublayer functions, and adaptive channel hopping and determinism Scheduling etc. This standard applies to the planning, deployment and implementation of wireless networks in industrial-level field applications.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB 15629.11-2003 Information technology system telecommunications and information exchange between local area network and metropolitan area network specific requirements Part 11.Wireless LAN media access control and physical layer specification GB/T 15629.15-2010 Information technology system telecommunications and information exchange specific requirements for local area networks and metropolitan area networks Part 15.Low-speed wireless personal area network (WPAN) media access control and physical layer specification GB/T 26790.1-2011 Industrial Wireless Network WIA Specification Part 1.WIA System Structure and Communication Specification for Process Automation IEEE802.15.4-2011 Local Area Network and Metropolitan Area Network Part 15.4.Low Rate Wireless Personal Area Network3 Terms and definitionsThe following terms and definitions defined in GB/T 26790.1-2011 apply to this document. For ease of use, the following is repeated Some terms and definitions in GB/T 26790.1-2011. 3.1 Adaptive frequency hopping In each time slot of the communication phase in the industrial wireless network superframe cluster, the communication channel is changed according to the actual channel conditions. [GB/T 26790.1-2011, definition 3.1.3] 3.2 Adaptive frequency switching In the industrial wireless network superframe, the beacon phase and the active period replace the communication channel according to the actual channel condition within a superframe period. Different channels are used in different super frame periods. [GB/T 26790.1-2011, definition 3.1.4] 3.3 Beacon In industrial wireless networks, the access point or the terminal node device that acts as the parent node broadcasts the frame of the node. Note. The beacon frame is used for a new parent node or terminal node to join the industrial wireless network. 3.4 broadcast Send the packet to all the nodes that can be received in the industrial wireless network. [GB/T 26790.1-2011, definition 3.1.8] 3.5 channel The radio frequency medium used to transfer packets from the sender to the receiver. 3.6 A logical node group including a parent node and multiple terminal nodes. 3.7 coexist A network has the ability to perform tasks without being disturbed or disturbing other networks in the same environment. Note. These networks follow the same or different rules. 3.8 compatible A network can provide services to or receive services from other networks, and realize multiple networks through service exchange The ability to operate effectively between. 3.9 Data link sublayer Located above the MAC layer, it is used to process industrial wireless network topology, link and communication resources. [GB/T 26790.1-2011, definition 3.1.17] 3.10 Terminal node Equipment installed in the industrial site to connect or control the production process. 3.11 Frequency hopping Transceiving channel switching method, the purpose is to resist interference and reduce signal fading. [GB/T 26790.1-2011, definition 3.1.20] 3.12 Access Point Devices that connect industrial wireless networks with other factory networks. 3.13 Hop In industrial wireless networks, the process of packet transmission between two adjacent nodes without the participation of other nodes. Note. Multi-hop is used to extend the transmission distance, bypass interference sources and avoid blocking. 3.14 Interoperability The ability of two or more networks to exchange information with each other and to utilize the exchanged information. 3.15 Join Industrial wireless network nodes are authenticated and allowed to access the industrial wireless network. 6.3.1.5 Receiver ED The test scenario of the receiving end ED of the 433MHz~510MHz frequency band module should conform to the stronger one based on GB 15629.11-2003 Interference scenario, that is, there are at least two commercial wireless networks, and they are continuously connected with two commercial wireless networks for data exchange. In this scenario, the ED curve of each channel in the 433MHz frequency band meets the accuracy requirements of 6dB2), and it is linear in this range. And moderately monotonous. 6.3.2 RF requirements for 470MHz~510MHz frequency band 6.3.2.1 Modulation method The receiving end of the 470MHz~510MHz frequency band module uses GFSK modulation, and the data rate is 100kbit/s. 6.3.2.2 Receiver sensitivity The sensitivity of the module receiver in the 470MHz~510MHz frequency band should meet. in each channel of the 470MHz~510MHz frequency band, When the receiver sensitivity drops to -107dBm1), the packet error rate is not more than 1%. 6.3.2.3 Interference suppression at the receiving end (adjacent channel) The interference suppression (adjacent channel) at the receiving end of the 470MHz~510 MHz frequency band module should meet. when the interference signal power rises to -50dBm1), the packet error rate is not more than 1%. The specific condition is that the input power in the working channel is equal to -82dBm1), and the input power of the interference signal of the interval channel to the working channel is equal to The value is at least 0dB2). 6.3.2.4 Interference suppression at the receiving end (non-adjacent channels) 470MHz~510MHz frequency band module receiving end interference suppression (non-adjacent channel) should meet. when the interference signal power rises to -35dBm1), the packet error rate is not more than 1%. The specific condition is that the input power in the working channel is equal to 82dBm1), and the input power of the interference signal of the non-adjacent channel to the working channel is the same. The value is at least 30dB2). 6.3.2.5 Receiver ED The test scenario of the receiving end ED of the 470MHz~510MHz module should meet the strong interference based on GB 15629.11-2003 The scenario is that there are at least two commercial wireless networks, and they are continuously connected to two commercial wireless networks for data exchange. here In the scene, the ED curve of each channel in the 470MHz~510MHz frequency band meets the accuracy requirements of 6dB2), within this range. It is linear and moderately monotonous. 6.3.3 780MHz frequency band RF requirements 6.3.3.1 Modulation method The receiving end of the 780MHz frequency band module uses O-QPSK modulation, and the data rate is 250kbit/s. 6.3.3.2 Receiver sensitivity The receiver sensitivity of the 780MHz frequency band module should comply with. In each channel of the 780MHz frequency band, the receiver sensitivity is reduced -100dBm1), the packet error rate is not more than 1%. 6.3.3.3 Interference suppression at the receiving end (adjacent channel) The interference suppression (adjacent channel) at the receiving end of the 780MHz frequency band module should meet. when the interference signal power rises to -40dBm1), the packet error The rate is not more than 1%. The specific condition is that the input power in the working channel is equal to -82dBm1), and the input power of the interference signal of the interval channel to the working channel is equal to The value is at least 0dB2). 6.3.3.4 Interference suppression at the receiving end (non-adjacent channels) The interference suppression (non-adjacent channel) at the receiving end of the 780MHz frequency band module should meet. when the interference signal power rises to -25dBm1), the error The package rate is not more than 1%. The specific condition is that the input power in the working channel is equal to -82dBm1), the input power of the interference signal of the non-adjacent channel to the working channel The relative value is at least 30dB2). 6.3.3.5 Receiver ED The test scenario of the receiving end ED of the 780MHz frequency band module should meet the strong interference scenario based on GB 15629.11-2003. That is, there are at least two commercial wireless networks, and they are continuously connected to two commercial wireless networks for data exchange. In this scenario The ED curve of each channel of the 780MHz module satisfies the accuracy requirement of 6dB2), which is linear and moderately monotonous in this range. 6.3.4 Coexistence of Same Frequency Commercial Wireless Network 6.3.4.1 Definition of Coexistence The coexistence of co-frequency commercial wireless networks is defined as high-reliability and low-latency wireless networks that work in the 2.4GISM frequency band. The frequency band is based on the channel interference of the GB 15629.11-2003 wireless network to achieve coexistence with the GB 15629.11-2003 wireless network. The coexistence test is mainly carried out under three different levels of wireless network interference scenarios based on GB 15629.11-2003. 6.3.4.2 Interference scenario 3 wireless network interference scenarios based on GB 15629.11-2003. a) Interference scenario 1--light interference scenario. In this interference scenario, there is a commercial GB 15629.11-2003 wireless network, and The commercial wireless network has not made a deliberate network connection, that is, has not constructed deliberate data interaction interference; b) Interference Scenario 2-General Interference Scenario. In this interference scenario, there are at least 2 commercial GB 15629.11-2003 wireless networks Network, and make a deliberate intermittent network connection with one of the commercial GB 15629.11-2003 wireless networks, that is, a small amount of Data interaction without continuous interference; c) Interference scenario 3-Strong interference scenario. In this interference scenario, there are at least 2 commercial GB 15629.11-2003 wireless networks Network, and with two commercial GB 15629.11-2003 wireless networks for purposeful continuous network connection, that is, continuous data interaction. 6.3.4.3 Co-existence determination of co-frequency commercial wireless networks The coexistence of the 2.4GHz module and the same-frequency commercial wireless network shall comply with the wireless network interference scenario 1 in GB 15629.11-2003 respectively. In the line network interference scenario 2, the wireless network interference scenario 3, the 2.4GHz module can automatically jump to the 2.4GHz frequency band and is not affected by the current wireless network. It can communicate with the channel interfered by the working channel of the network to realize coexistence with the GB 15629.11-2003 wireless network. 6.4 Physical layer service specification 6.4.1 Physical layer reference model The reference model of the physical layer (PHY) service is shown in Figure 2. The physical layer defines two services. PHY data service connected to the physical layer data service access point (PDSAP) and connected to the physical layer Layer management entity service access point (PLMESAP) PHY management service. The physical layer management entity (PLME) maintains a Identify the MAC command being used. The payload field of the command frame contains the MAC command itself. The payload field of the command frame has a variable length, and And it contains specific and different data from the command frame type. 7.2.2 Accurate time synchronization 7.2.2.1 Classification The key technology of time synchronization is mainly divided into the advertising frame/beacon frame time synchronization method and the command frame time synchronization method. 7.2.2.2 Beacon frame time synchronization The beacon frame time synchronization is one-way time synchronization based on broadcasting. In order to reduce the energy overhead caused by time synchronization, the IEEE In the 802.15.4-2011 physical layer industrial wireless network, beacon frames can be used to complete time synchronization. Beacon frame time synchronization steps as follows. a) The access point periodically broadcasts time synchronization beacon frames to its neighbor parent nodes, and loads the beacon transmission time into the beacon frame Designated fields; b) The parent node generates an SFD interrupt when receiving a beacon frame and records the local beacon reception time; c) The parent node calculates the time deviation between the clock of the node and the standard clock through the timestamps obtained by sending and receiving, and compensates for the local clock, In this way, synchronization with the time source node is realized. Similarly, in the star network, the parent node periodically broadcasts beacon frames, and the terminal nodes in the star network also receive beacon frames to complete synchronization. In this way, all nodes in the network can synchronize with their own time sources, and finally complete the time synchronization of the entire network. 7.2.2.3 Command frame time synchronization In order to meet the accuracy requirements of different industrial applications, the accuracy of time synchronization can reach milliseconds (ms) or even tens of microseconds (μs). Reliable low-latency wireless networks can also use dedicated time synchronization command frames for secondary synchronization. The time synchronization command frame can be sent periodically by the access point and the terminal node acting as the parent node. --- The access point uses the inter-cluster communication period to send time synchronization command frames to achieve time synchronization of the mesh network; --- The parent node uses the intra-cluster communication period to send time synchronization command frames to achieve time synchronization in the star network. In the specific design of the time synchronization command frame, the following two command frame synchronization methods should be adopted. a) Periodic broadcast synchronization. The time source node periodically sends time synchronization command frames, which is similar to beacon frame synchronization. b) Point-to-point synchronization on demand. The node applies for the time synchronization command frame from the time source. The steps are as follows. 1) The node sends a synchronization request to load and send the time stamp T1 to the time source node; 2) The time source node receives the request, records the received request time T2, and parses the time information in the request; 3) The time source node sends a time synchronization command frame to the node at T3, and the synchronization node needs to receive the command frame at T4; The node that needs to be synchronized calculates the time deviation θ value and the synchronization frame transmission time d by equations (1) and (2). θ= (T1-T2)-(T4-T3) (1) d= (T2-T1) (T4-T3) (2) In formula (1) and formula (2). θ --- time deviation; d ---Synchronous frame transmission time; T1 --- node sending time; T2 --- the time when the source node receives the request; T3 ---Synchronization command frame sending time; T4 ---Command frame receiving time. 4) The application synchronization node compensates its local clock according to the calculated time deviation. 7.2.2.4 Multi-hop network time synchronization compensation 7.2.2.4.1 Synchronous compensation In large-scale thousands-point wireless network applications with high reliability and low latency, data messages sent by terminal nodes often need to be transmitted through multiple hops Only the input can reach the access point, and the time synchronization accuracy error will accumulate as the number of hops increases. Multi-hop network time synchronization should be synchronized Step compensation. 7.2.2.4.2 Fitting frequency drift In addition to the initial time deviation of the two device clocks, the source of time synchronization error is the crystal drift of the clock is the most important factor. The algorithm that uses multiple synchronizations to do linear fitting to the clock's crystal frequency drift can compensate for the drift value. When the algorithm has established a function The clock synchronization model is shown in equation (3). Tn=αTm β (3) Where. Tn --- Receiving time of synchronization frame; α --- Crystal frequency drift; Tm --- send time; β --- Original time deviation. Periodic synchronization can get multiple time data points, and the parameter fitting of these points can get the frequency drift and time deviation value. 7.2.2.4.3 Statistical parameter estimation Another important source of time synchronization error is the time delay in the sending, transmission and reception of synchronization messages, including Deterministic delay and uncertainty delay. In order to reduce the time delay error, the statistical signal processing method is used to estimate the time deviation. The clock synchronization model is shown in equation (4). TSA2i =fskew×(TS1i XSAi dSA) θSAoffset (4) Where. TSA2i ---The synchronization message reception time of node A for the i-th synchronization; TS1i --- Time source node S synchronization message sending time; fskew---the relative frequency drift of the two nodes; θSAoffset---the original time deviation of the two nodes; dSA --- message transmission time (deterministic delay); XSAi --- Random delay during message transmission (uncertainty delay). Assuming that XSAi obeys the Gaussian normal distribution, the maximum likelihood estimation can be used to estimate the time deviation to obtain the time deviation. Shift value. 7.2.2.4.4 Monitor synchronization Monitor synchronization is used to reduce the accumulation of multi-hop network synchronization errors. This method......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 38618-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 38618-2020_English as soon as possible, and keep you informed of the progress. 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