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GB/T 31024.2-2014: Cooperation of roadside to vehicle - Dedicated short range communications - Part 2: Specification of medium access control layer and physical layer Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 31024.2-2014: Cooperation of roadside to vehicle - Dedicated short range communications - Part 2: Specification of medium access control layer and physical layer---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31024.2-2014 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 35.100 L 79 Cooperation of roadside to vehicle - Dedicated short range communications - Part 2.Specification of medium access control layer and physical layer Issued on. AUGUST 05, 2014 Implemented on. FEBRUARY 01, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 4 Introduction... 5 1 Scope... 6 2 Terms and definitions... 6 3 Abbreviations... 8 4 System reference model... 11 5 Medium access control layer of communication mode with center node... 12 6 Medium access control frame formats of communication mode with center node... 17 7 Functions of medium access control layer of communication mode with center node... 43 8 Medium access control layer of communication mode without center node 79 9 Physical layer of communication mode with center node... 83 10 Physical layer of communication mode without center node... 125 Annex A (informative) Patent information involved in this Part... 133 Annex B (normative) Modulation and coding scheme parameters... 135 Annex C (normative) Demodulation pilot pattern... 136 Annex D (normative) Sounding pilot pattern... 137 Annex E (normative) Check matrix of low-density parity check code... 138 Bibliography... 1441 ScopeThis Part of GB/T 31024 specifies the technical requirements for medium access control layer and physical layer of dedicated short-range communications of cooperation of roadside to vehicle, including system reference model, MAC layer frame format and MAC layer function of communication mode with center node, MAC layer frame format and function of communication mode without center node, physical layer parameters and functions of communication mode with center node, physical layer parameters and functions of communication mode without center node. This Part is applicable to the wireless communication equipment between vehicles of cooperative intelligent transportation system as well as the wireless communication equipment between vehicle and road infrastructure.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 2.1 MAC protocol data unit; MPDU A data unit that is exchanged between two equivalent MAC entities by using PHY layer service. 2.2 MAC management protocol data unit A data unit that is exchanged between two equivalent MAC entities to implement the MAC management protocol. 2.3 MAC service data unit The information that is delivered as a unit between MAC service access points (SAP).3 AbbreviationsThe following abbreviations apply to this document. ACK. Acknowledgement ARQ. Automatic Repeat Request BCC. Binary Convolutional Code BCF. Broadcasting Control Frame BFM. Beamforming Matrix BOBUID. Broadcasting OBUID BPSK. Binary Phase Shift Keying4 System reference modelSee Figure 1 for the system reference model. The main functions of each layer are as follows.5 Medium access control layer of communication mode with center node5.1 Overview MAC layer is used to manage and control the allocation and sharing of physical layer transmission resources between multiple users. See Figure 2 for the function composition. 5.2 Adaptation sublayer MAC layer is divided into adaptation sublayer and MAC sublayer. The adaptation sublayer uses the services provided by MAC sublayer. The functions of the adaptation sublayer are as follows. 5.3 Medium access control sublayer The basic functions of the MAC sublayer are divided into the management control plane and the data plane.6 Medium access control frame formats ofcommunication mode with center node 6.1 Common medium access control frame format 6.1.1 Overview of common medium access control frame format See Figure 4 for the frame format of MAC protocol data unit (MPDU). Every MPDU can be divided into three parts. 6.1.2 Frame control field 6.1.2.1 Description of frame control field The frame control field contains the following fields. protocol version, frame type, subtype, flow identification (FID), retransmission indication, and reservation. 6.1.2.2 Protocol version field The protocol version field length is 2 bits. And the length and position remain the same in all revisions of this Part. The protocol version value in this Part is 0, all other values are reserved. 6.1.4 Sequence number field The length of sequence number field is 12 bits. The value ranges from 0~4095. It is used to indicate the sequence number of MSDU / MMPDU. All MSDUs / MMPDUs sent in an FID flow are assigned a sequence number. 6.1.5 Reservation The reservation field is 3 bits. The default setting is 0. 6.2 Data frame 6.2.1 Overview of data frame See Figure 6 for the frame format of data frame. 6.2.2 Reserved field The length of this filed is 1 bit. The default setting is 0.7 Functions of medium access control layer ofcommunication mode with center node 7.1 Adaptable sublayer The function of the adaptable sublayer is to classify the IP layer data and use an FID to identify a service flow. 7.2 Medium access control sublayer 7.2.1 Address searching and connection OBU and RSU both have a 48-bit globally-unique MAC address as identification. This address is used for mutual acknowledgement and network packet forwarding during the network access phase. 7.2.2 Medium access control address Both OBU and RSU use a globally-unique 48-bit MAC address as the identifier. 7.2.3 Broadcast on board unit identification The BOBUID length is 12 bits. Value range is. 0x000 and 0x001.It is used to broadcast to all OBUs within the scope of this RSU. 7.3 Network access process of on board unit 7.3.1 Overview The network access process refers to the process by which OBU discovers the network and establishes a connection with RSU. The network access includes the following steps. 7.9 Frame acknowledgement This clause uses ACK frame or GroupACK frame for frame acknowledgement. For management control frames, the unicast management control frames without corresponding response frames need to use ACK or GroupACK to conduct acknowledgement. Otherwise, it shall directly use the corresponding response frame for acknowledgement. See Table 25 for the corresponding response frames.8 Medium access control layer of communication mode without center node8.1 Description of medium access control layer of communication mode without center node The communication mode without center node directly transmits message between vehicles. 8.2 Medium access control layer frame structure of communication mode without center node 8.2.1 Overview See Figure 54 for the frame format of MAC layer of the communication mode without center node. The MAC frame can be divided into three parts. The first part is the fixed-length MAC header. The second part is the data carried in the MAC frame. 8.2.3 Hop indication field The hop count indication field contains 8 bits, as shown in Figure 56.The first four bits indicate the number of hops in the current frame. From 0000 to 1111, it indicates the 0th to the 15th hops. The last four bits indicate the maximum hop limit. From 0000 to 1111, it indicates that the maximum hop limit is the 0th to the 15th hops. 8.2.5 Serial number field The serial number field is 8 bits long. The value range is 0~255, used to indicate the sequence number of MSDU / MMPDU. 8.2.6 Length indication field The length indication field has 12 bits in total, used to indicate the length of the following data field. 8.2.7 Reserved field The reserved filed is 8 bits. The default setting is 0. 8.2.8 Data field The data field length is variable. The minimum data length is 0 byte. The maximum data length is 4095 bytes.9 Physical layer of communication mode with center node9.1 Basic parameters for frame structure and orthogonal frequency division complex 9.1.1 Frame structure See Figure 57 for the frame structure of the physical layer. 9.1.3 Symbols of physical layer See Table 30 for the definitions of relevant symbols of physical layer in this Part. 9.2 Transmitter block diagram and signal processing flow 9.2.1 Transmitter block diagram See Figure 59 for RSU side transmitter block diagram. 9.2.3 Channel coding 9.2.3.1 Overview The channel coding module performs FEC protection on the scrambled data bit sequence. This Part supports two types of forward error correction codes. convolutional coding and LDPC coding. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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