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GB/T 31983.31-2017 English PDF

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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 31983.31-2017	85	Add to Cart	Auto, < 3 mins	Narrow band power line communication over low-voltage mains -- Part 31: Narrow band orthogonal frequency division multiplexing power line -- Communication physical layer specification	Valid

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Basic data

Standard ID: GB/T 31983.31-2017 (GB/T31983.31-2017)
Description (Translated English): Narrow band power line communication over low-voltage mains -- Part 31: Narrow band orthogonal frequency division multiplexing power line -- Communication physical layer specification
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: N22
Classification of International Standard: 17.220.20
Word Count Estimation: 35,388
Date of Issue: 2017-05-12
Date of Implementation: 2017-12-01
Quoted Standard: GB/T 31983.11-2015
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the low-voltage narrowband power line communication (PLC) physical layer protocol specification based on orthogonal frequency division multiplexing (OFDM) technology, including physical layer protocol data unit format (PPDU), channel coding, interleaving, OFDM modulation, physical layer signal Frame generation and continuous transmission mode and power frequency synchronization zero time slot transmission mode. This standard applies to the 3 kHz ~ 500 kHz band through indoor or outdoor low voltage AC distribution line or DC transmission line for data transmission and communication. On the basis of the standard physical layer protocol specification, a complete PLC system composed of multiple communication nodes established on the low voltage distribution network also includes a data link layer (DLL, a medium access control sublayer MAC and a logical link Control sublayer LL

GB/T 31983.31-2017: Narrow band power line communication over low-voltage mains -- Part 31: Narrow band orthogonal frequency division multiplexing power line -- Communication physical layer specification

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Narrow band power line communication over low-voltage mains - Part 31.Narrow band orthogonal frequency division multiplexing power line - Communication physical layer specification ICS 17.220.20 N22 National Standards of People's Republic of China Low-voltage narrowband power line communications. Part 31.Physical layer specification for narrowband orthogonal frequency division multiplexing power line communications 2017-05-12 released 2017-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Issued by China National Standardization Administration

Foreword Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions, symbols, abbreviations 1 4 Network model 4 4.1 PLC domain 4 4.2 Reference model 4 5 Physical layer coding and modulation 5 5.1 Overview 5 5.2 Physical layer block diagram 6 5.3 Data preprocessing 6 5.4 Physical layer frame format 7 5.5 Subcarrier 9 5.6 Channel coding 10 5.7 OFDM modulation 13 6 Physical layer signal transmission mode 20 6.1 Overview 20 6.2 Continuous transmission mode 20 6.3 Power frequency synchronization zero-crossing time slot transmission mode 20 7 Physical layer services 20 7.1 Overview 20 7.2 Data Services 20 7.3 Physical layer management services 23 7.4 Physical layer constants and attributes 24 8 Electrical index requirements 25 Appendix A (normative appendix) CRC-5 and CRC-16 structure 26 Appendix B (Normative Appendix) Frequency Scheme 27 Appendix C (Normative Appendix) Structure of Bit Scrambling 28 Appendix D (Normative Appendix) Structure of Convolutional Encoder 29 Appendix E (normative appendix) Pseudo random sequence PNb(k) generator structure diagram 30 Reference 31

Foreword

GB/T 31983 "Low-Voltage Narrowband Power Line Communication" is divided into the following parts. ---Part 11.3kHz~500kHz frequency band division, output level and electromagnetic disturbance limit; ---Part 21.3kHz~500kHz frequency band communication equipment and system immunity requirements; ---Part 31.Narrowband Orthogonal Frequency Division Multiplexing Power Line Communication Physical Layer Specification; ---Part 32.Narrowband Orthogonal Frequency Division Multiplexing Power Line Communication Data Link Layer Specification. This part is part 31 of GB/T 31983. This section was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This part was proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Electrical Instrumentation Standardization Technical Committee (SAC/TC104). Drafting organizations of this section. State Grid Heilongjiang Electric Power Co., Ltd., Shenzhen Lihe Microelectronics Co., Ltd., Harbin Electrical Instrument Research Institute, China Electric Power Research Institute, Qingdao Dingxin Communication Co., Ltd., Juquan Optoelectronics Technology (Shanghai) Co., Ltd., State Grid Qingshi Electric Power Company Electric Power Research Institute, Heilongjiang Electric Power Co., Ltd. Measurement Center, Shenzhen Aerospace Teruijie Electronics Co., Ltd., China Grid Jiangsu Electric Power Research Institute, Yunnan Power Grid Co., Ltd. Electric Power Research Institute, State Grid Jiangxi Electric Power Research Institute Institute, Yantai Oriental Weston Electric Co., Ltd., Jiangsu Linyang Energy Co., Ltd., Holley Technology Co., Ltd. The main drafters of this section. Liu Kun, Wang Xuan, Chen Bo, Ge Dehui, Liu Xuan, Meng Yu, Zhang Xuming, Li Wanhong, Zhao Feng, Guan Wenju, Yang Xiaoyuan, Sun Hongliang, Cao Min, Wang Tianyu, Zhao Zhenyu, Ji Feng, Liu Jian, Wang Wenguo, Lu Hanxi, Zeng Shitu, Chen Wenxin, Jiang Bin.

Introduction

With the rapid development of smart grid and power Internet of Things, there is an urgent need to improve network and communication technology according to new demands. The grid itself It is a huge network connecting various electrical equipment and terminals, using power lines for data transmission and realizing various electrical equipment and terminals The network connection has the advantage of not requiring rewiring. Developed countries and the International Organization for Standardization use power lines as the medium for communication technologies and standards With the advancement of industrialization, standards such as ITU.g.9901/2/3/4 and IEEE1901.2 have been introduced successively. In this context, this standard system is formulated in accordance with China's national conditions. This physical layer protocol specification supports 3kHz~500kHz power line communication dedicated frequency band, suitable for data equipment passing indoor or outdoor Low-voltage AC distribution lines or DC transmission lines for data transmission and communication. This physical layer protocol specification is based on Orthogonal Frequency Division Multiplexing (OFDM) Technology, and allows specific application systems to define specific center frequency and bandwidth. On the basis of this physical layer protocol specification, the data link layer protocol can be defined. This physical layer protocol specification is not limited to any specific Narrowband power line communication application layer protocol, which is suitable for various low-voltage narrowband power line communication application systems, including (but not limited to) smart Energy meter centralized meter reading (AMR), AMI/AMM, smart home control, street lamp control, building intelligence, electric vehicle charging control, etc. Low-voltage narrowband power line communication

1 Scope

This part of GB/T 31983 specifies the physics of low-voltage narrow-band power line communication (PLC) based on orthogonal frequency division multiplexing (OFDM) technology Layer protocol specifications, including physical layer protocol data unit format (PPDU), channel coding, interleaving, OFDM modulation, physical layer signal frame generation And continuous transmission mode and power frequency synchronization zero-crossing time slot transmission mode, etc. This part is applicable to data transmission in the frequency range of 3kHz~500kHz through indoor or outdoor low-voltage AC power distribution lines or DC transmission lines And communication. On the basis of this part of the physical layer protocol specifications, a complete set of multiple communication nodes established on the low-voltage distribution network The entire PLC system also includes a data link layer (DLL, which is composed of a medium access control sublayer MAC and a logical link control sublayer LLC) to And the application layer related to the specific application situation. Typical low-voltage narrow-band power line communication application scenarios include centralized meter reading of smart energy meters (AMR), AMI/AMM, home smart control, street light control, smart building, four-meter collection and smart grid (SmartGrid) other Applications, such as. electric vehicle charging control, etc. This section also applies to medium-voltage power line communications, and long-distance power line communications in cities and rural areas.

2 Normative references

The 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/T 31983.11-2015 Low-voltage narrowband power line communication Part 11.3kHz~500kHz frequency band division, output level And electromagnetic disturbance limit 3 Terms and definitions, symbols, abbreviations 3.1 Terms and definitions The following terms and definitions apply to this document. 3.1.1 Power line communication The information data is modulated to a suitable carrier frequency, and the power line is used as a physical medium for transmission to realize communication between data terminals. Letter or control. 3.1.2 Power line carrier communication That is power line communication. 3.1.3 Narrowband power line communication Power line communication with carrier frequency in 3kHz~500kHz frequency band. 3.1.4 Low voltage power line communication Power line communication using low-voltage distribution lines as the medium. 3.1.5 PLC low-level protocol The PLC low-level protocol includes the physical layer and the data link layer (consisting of the medium access control sublayer and the logical link control sublayer). 3.1.6 PLC application The specific power line communication application system based on the PLC low-level protocol has certain business functions and application-level protocols. 3.2 Symbols The following symbols and codes apply to this document. b ---The width of the bit group loaded on the subcarrier. DL --- The length factor of the payload carrying data. G ---The number of subcarrier groups.

4 Network model

4.1 PLC domain The PLC domain refers to a power line communication category established on the low-voltage distribution network. It has the following characteristics. a) A PLC domain contains a domain management node (DM) and multiple terminal equipment nodes (TN). DM is responsible for managing the Terminal equipment nodes, including network management and routing management. Each node has a medium access control (MAC) ground The address should be unique in a domain. b) There may be multiple PLC domains on the same low-voltage distribution network, and each domain has a domain ID (DID). Within the power grid, the domain identifier should be unique. The division of these domains is logical rather than physical, and adjacent domains may partially overlap. Therefore, nodes belonging to a certain domain may "hear" nodes in another domain at the physical layer. To eliminate or reduce this inter-domain string For the impact of interference on PLC communication, certain measures should be taken, including wave isolation, domain identification, and time domain or frequency domain multiplexing channels Access mechanism, etc. c) The PLC domain can be an "incomplete connection" domain, that is, due to channel noise, interference and signal attenuation between two nodes in the domain. Can not realize the physical layer point-to-point communication. Therefore, the communication between nodes in the domain may need to be relayed by other nodes. 4.2 Reference model 4.2.1 Overview The PLC domain protocol reference model and its corresponding relationship with the OSI reference model are shown in Figure 1.It includes the physical layer (PHY), media access Ask the control sublayer (MAC), logical link control sublayer (LLC), application support layer (APS) and application layer (APP). PHY layer, MAC sub The composition of the layer and LLC sub-layer does not depend on the low-level protocol of the specific application. It provides services for the application layer through the APS layer and the application interface (AI). In the actual system, the application layer corresponds to a specific application situation and application layer protocol, such as. AMR, home energy management (HEM) and so on. Figure 1 PLC reference model 4.2.2 Main functions and services of each layer The APS layer provides adaptation functions for the application layer protocol data to be transmitted through the DLL layer. Application interface (AI) consists of specific application scenarios The definition generally includes physical or logical interfaces and interactive protocols. The application layer submits data to be sent through AI, and receives data through AI. APS uses data link layer services for data transmission and reception. The LLC sublayer and the MAC sublayer constitute the data link layer DLL. DLL provides an end-to-end data link for the application layer. LLC sublayer Responsible for the establishment, management and control of network routing, including node relay and forwarding control. The MAC sublayer is responsible for the access control of the power line shared medium Controls, including carrier sense and collision avoidance (CSMA/CA) algorithms, to avoid sending conflicts. The physical layer is responsible for channel coding and OFDM modulation of MAC sublayer data, generating physical layer signal frames, and coupling signals to Transmission on the power line. In the receiving direction, the physical layer will demodulate and decode the signal frame received from the power line to restore the data link Layer data and submit it to the MAC sublayer. The medium-independent physical layer interface (PMI) is a physical layer service interface independent of the specific physical medium. PMI is a functional interface, Service primitive definition, including PHY layer data and management services. The physical layer is connected to the physical medium through the medium-dependent interface (MDI). MDI is related to the specific physical medium. MDI includes signal Electrical index requirements, as well as the coupling and connection specifications of signals and physical media. In addition, the physical layer, MAC sublayer, LLC sublayer, and APS layer pass the management primitives PHY-MGMT, MAC-MGMT, LLC-MGMT and APS-MGMT provide management services. 4.2.3 Physical layer services The physical layer provides data services and management services that do not depend on specific physical media through PMI, as shown in Table 2 and Table 3.

5 Physical layer coding and modulation

5.1 Overview This physical layer is based on the narrowband OFDM technology covering the frequency band of 3kHz~500kHz, and supports the continuous transmission of physical layer signal frames Or power frequency synchronous zero-crossing time slot transmission mode. 5.2 Physical layer block diagram The physical layer transmitter block diagram is shown in Figure 2. The transmitter completes the conversion from the input data bits to the power line transmission signal. The input data bits to be sent are bit scrambled, RS coding, convolutional coding, puncturing, bit repetition, interleaving, then bit-to-symbol constellation mapping, and then the mapped data and pilot The data is modulated together with OFDM symbols, and the cyclic prefix is inserted and the window is overlapped, thus forming the frame body part of the data. Data frame body Part of it is multiplexed with the preamble and frame header to form a transmission signal frame, which is finally injected into the power line for transmission through the analog front end. 5.3 Data preprocessing 5.3.1 CRC check The MAC layer protocol data unit (MPDU) to be sent is passed to the physical via the PMI interface service primitive PHY-DATA.req Layer, the data length is LMPDU bytes. The LMPDU byte data input to the physical layer becomes Ld byte after zero-filling according to formula (2) and represents For DL. The Ld byte data becomes the data actually sent by the physical layer. At the sending end, calculate CRC-16 for Ld byte data, and add The 16-bit CRC check word is appended to the back of the data block to form Ld 2 bytes. The implementation structure of CRC-16 is shown in Appendix A.2, its initial value is 0xFFFF, and it is reset before encoding when each new MPDU is input. 5.3.2 Framing transmission If the Ld 2 byte data exceeds the maximum data length BytesPerFrame that a single physical frame can carry, it needs to be split into Multiple physical frames are sent. The physical layer encodes and sends each sub-frame independently. Framing consists of the Framing Sequence Number (FSN) in the physical frame header To identify. The framing process is as follows. a) If sending Ld 2 bytes does not exceed BytesPerFrame, then a single frame is sent; BytesPerFrame is carried by a single frame at the physical layer The maximum number of OFDM (MOFDM), modulation method, coding method, and number of subcarrier groups are determined. MOFDM=64. b) Otherwise, split the Ld 2-byte data into multiple sub-frames for transmission. The framing processor determines the score according to BytesPerFrame The number of frames and the number of bytes sent per frame. c) Each sub-frame is encoded and sent independently, and is identified by FSN (see Table 5). 5.4 Physical layer frame format 5.4.1 Overview The physical layer frame consists of a preamble, a physical frame header (PFH), an extended frame header (PFH_EXT) (if any) and a payload (Payload) group As shown in Figure 3. Figure 3 Physical layer frame structure The preamble is used by the receiver for frame detection, frame synchronization and timing, and carries transmission mode recognition. The physical frame header carries the frame type, coding and modulation Information such as control mode is provided for the receiver to demodulate and decode the received physical layer signal frame. Extended frame header (if any) carries subcarrier dynamics Mapping table. The frame load field carries the MAC layer protocol data unit (MPDU), the length of which is variable. 5.4.2 Preamble The preamble is mainly used for frame signal detection at the receiving end, frame synchronization, receiver timing synchronization, etc., and carries the transmission mode identifier. Local physical layer Two transmission modes are supported. continuous transmission and power frequency synchronous zero-crossing time slot transmission. The sending end can use any of them, and the receiving end will automatically detect it. The identification codes corresponding to the two transmission modes are. 5.4.3 Physical Frame Header (PFH) The physical frame header is 30 bits of information, including frame type (FT, 1 bit) and frame control information (FCI, 29 bits). This physical layer defines two frame types, namely data frame and confirmation frame. The definition is shown in Table 4. Table 4 Frame type FT definition Domain name bit width bit definition Frame type (FT) 1 b0 0.data frame 1.confirmation frame According to the different frame types, the meaning of FCI is also different, divided into data frame FCI and confirmation frame FCI. When FT=0, the frame type is data frame, and the FCI definition of data frame is shown in Table 5. 5.4.4 Extended frame header (PFH_EXT) When the frame header extension flag (EXT) in the physical frame header PFH is 1, PFH follows PFH_EXT. PFH_EXT has a total of 36 bits, subcarrier dynamic mapping (TM) occupies 31 bits, and the extended frame header check word EHCS occupies 5 bits, as shown in Table 7. The smallest unit of sub-carrier dynamic shielding is a sub-carrier super group. See 5.5.3 for the definition of subcarrier supergroup. When multiple frames are continuously sent, if there is sub-carrier dynamic shielding, the first frame carries the sub-carrier dynamic mapping table through PFH_EXT, and the subsequent frames No need to carry PFH_EXT repeatedly. 5.4.5 Payload The payload carries user or high-level protocol data, that is, the physical layer service data unit (PSDU). 5.5 Subcarrier 5.5.1 Subcarrier type Subcarriers are divided into the following types. a) Unavailable subcarriers (FSC). specified according to national or regional frequency band policies or for other purposes (e.g. guard......

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