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GB/T 31024.2-2014 English PDF (GBT31024.2-2014)

GB/T 31024.2-2014 English PDF (GBT31024.2-2014)

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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

This 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.
GB/T 31024.2-2014
NATIONAL STANDARD OF THE
PEOPLE 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 Contents
Foreword ... 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 5.1 Overview ... 12
5.2 Adaptation sublayer ... 13
5.3 Medium access control sublayer ... 13
5.4 On board unit state ... 14
6 Medium access control frame formats of communication mode with center node ... 17
6.1 Common medium access control frame format ... 17
6.2 Data frame ... 21
6.3 Management control frame ... 22
6.4 Group MAC protocol data unit (G-MPDU) ... 42
7 Functions of medium access control layer of communication mode with center node ... 43
7.1 Adaptable sublayer ... 43
7.2 Medium access control sublayer ... 44
7.3 Network access process of on board unit ... 45
7.4 Service flow management ... 49
7.5 Resource request and resource allocation ... 54
7.6 Service type and service quality ... 58
7.7 Fragmentation and reassembly ... 60
7.8 Retransmission mechanism ... 60
7.9 Frame acknowledgement ... 61
7.10 Link self-adaptation ... 62
7.11 Quit network process ... 63
7.12 Random backoff ... 64
7.13 Power saving management ... 65
7.14 Mobility management ... 69
7.15 Exception handling ... 75
7.16 System configuration parameters ... 78
8 Medium access control layer of communication mode without center node 79 8.1 Description of medium access control layer of communication mode without center node ... 79
8.2 Medium access control layer frame structure of communication mode without center node ... 80
9 Physical layer of communication mode with center node ... 83
9.1 Basic parameters for frame structure and orthogonal frequency division complex ... 83 9.2 Transmitter block diagram and signal processing flow ... 86
9.3 Preamble sequence ... 103
9.4 System information channel and control channel ... 105
9.5 Uplink and downlink transmission channels ... 107
9.6 Uplink and downlink sounding channels ... 114
9.7 Uplink scheduling request channel ... 117
9.8 Uplink random access or ranging channel ... 120
9.9 Uplink power control ... 122
9.10 Uplink ranging scheduling ... 123
9.11 Indicator requirements for transmitter and receiver ... 124
10 Physical layer of communication mode without center node ... 125
10.1 Frame structure ... 125
10.2 Basic parameters for orthogonal frequency division complex ... 126 10.3 Transmitter block diagram and signal processing flow ... 127
10.4 Preamble sequence ... 130
10.5 System information channel ... 130
10.6 Transmission channel ... 131
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 ... 144
Foreword
GB/T 31024 ?€?Cooperation of roadside to vehicle - Dedicated short range
communications?€? is divided into the following 4 parts:
- Part 1: General technical requirement;
- Part 2: Specification of medium access control layer and physical layer; - Part 3: Network layer and application layer specification;
- Part 4: Equipment application specification.
This Part is Part 2 of GB/T 31024.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part was proposed by and shall be under the jurisdiction of National Technical Committee on Intelligent Transportation System of Standardization Administration of China (SAC/TC 268).
The drafting organizations of this Part: Highway Research Institute of Ministry of Transport, Beijing Xin'an Line Mobile Multimedia Technology Co., Ltd., Telecommunications Research Institute of the Ministry of Industry and
Information Technology, Beijing CCCC Guotong Intelligent Transportation System Technology Co., Ltd., Institute of Electronic Technology Standardization, Ministry of Industry and Information Technology.
Main drafters of this Part: Wang Xiaojing, Lei Jun, Song Xianghui, Yang Qi, Tang Libo, Li Bin, Yan Zhigang, Yang Hong, Liu Shenfa, Wang Jing, Yan Desheng, Liu Qianlei, Yao Huijuan, Yu Xiaoyan, Yang Yun, Wang Dongzhu, Yang Wenli, Liu Hongwei, Mei Xinmin.
Introduction
The issuing authority of this document draws attention to the use of related patents when declaring compliance with this document. See Annex A for
information on patents covered by this document.
The issuing authority of this document has no position on the authenticity, validity and scope of the patent.
The patent holder has assured the issuing authority of this document that he is willing to negotiate with any applicant on patent licenses under reasonable and non-discriminatory terms and conditions. The patent holder's statement has been filed with the issuer of this document. The patent related information can be obtained through the following contact information:
Patent holder name: Beijing Newshore Mobile Multimedia Technology Co., Ltd. Address: 16th Floor, Block A, Tsinghua Science and Technology Building, Haidian District, Beijing
Contact: Zheng Xingwang
Tel: 010-82150688
Cooperation of roadside to vehicle - Dedicated short
range communications - Part 2: Specification of
medium access control layer and physical layer
1 Scope
This 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 definitions
For 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).
2.4 road side unit
A functional entity that is installed on both sides of the road or on a mast, that receives and sends information to OBU through dedicated short-range wireless communication.
2.5 on board unit
A functional entity that is installed on vehicle, that has information collection, processing, storage, input and output interfaces, that has dedicated short-range wireless communication module.
2.6 modulation and coding scheme
A combination that uses specific modulation method and cording rate on the space stream.
2.7 space stream
Data flow that is transmitted in space in parallel.
2.8 space time stream
Space-time coded stream after space time is coded to space stream.
2.9 group acknowledgement
A way to feedback the confirmation information in batches.
2.10 short preamble sequence
A training sequence for automatic gain control and coarse synchronization. 2.11 long preamble sequence
A training sequence for fine synchronization and channel estimation.
2.12 system information channel
A physical channel that contains system information such as frame structure configuration.
2.13 control channel
A physical channel that contains uplink and downlink transmission scheduling information.
2.14 downlink sounding channel
A physical channel that is used to send downlink sounding signals to complete downlink channel measurement.
2.15 uplink sounding channel
A physical channel that is used to send uplink sounding signals to complete uplink channel measurement.
2.16 uplink scheduling request channel
A physical channel that is used to send uplink scheduling request signals. 2.17 uplink random access channel
A physical channel that is used to send uplink random access signals.
2.18 downlink transmission channel
A physical channel that is used to transmit user downlink service data and control information.
2.19 uplink transmission channel
A physical channel that is used to transmit user uplink service data and feedback information.
2.20 downlink guard interval
A guard interval for downlink to uplink conversion in the physical layer frame structure.
2.21 uplink guard interval
A guard interval for uplink to downlink conversion in the physical layer frame structure.
3 Abbreviations
The 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 Keying
BS: Buffer Size
CCH: Control Channel
CP: Cyclic Prefix
CQI: Channel Quality Information
CRC: Cyclic Redundancy Check
CSI: Channel State Information
DL-SCH: Downlink Sounding Channel
DL-TCH: Downlink Transmission Channel
DSA: Dynamic Service Addition
DSC: Dynamic Service Change
DSD: Dynamic Service Delete
EQM: Equal Modulation
FCS: Frame Check Sequence
FFT: Fast Fourier Transform
FID: Flow ID
FSN: Fragment Sequence Number
G-MPDU: Group MPDU
GroupACK: Group Acknowledgement
IFFT: Inverse Fast Fourier Transform
IP: Internet Protocol
LDPC: Low Density Parity Check
L-Preamble: Long Preamble
LSB: Least Significant Bit
MAC: Medium Access Control
MCS: Modulation and Coding Scheme
MIMO: Multiple Input Multiple Output
MMPDU: MAC Management Protocol Data Unit
MPDU: MAC Protocol Data Unit
MSB: Most Significant Bit
MSDU: MAC Service Data Unit
OBC: OBU Basic Capability
OBU: on Board Unit
OBUID: OBU Identifier
OFDM: Orthogonal Frequency Division Multiplexing
OME: OBU Management Entity
PDU: Protocol Data Unit
PHY: Physical Layer
PN: Pseudo Noise
PS: Power Saving
QAM: Quadrature Amplitude Modulation
QoS: Quality of Service
QPSK: Quadrature Phase Shift Keying
RA: Random Access
REQ: Request
RMS: Root Mean Square
RSP: Response
RSU: Roadside Unit
SAP: Service Access Point
SCG: Service Control Gateway
SDU: Service Data Unit
SICH: System Information Channel
SINR: Signal to Interference Noise Ratio
SN: Sequence Number
SNR: Signal to Noise Ratio
S-Preamble: Short Preamble
SSN: Starting Sequence Number
STBC: Space Time Block Code
TDD: Time-division Duplexing
TOBUID: Temporary OBUID
UGI: Uplink Guard Interval
UL-RACH: Uplink Random Access Channel
UL-SCH: Uplink Sounding Channel
UL-SRCH: Uplink Schedule Request Channel
UL-TCH: Uplink Transmission Channel
4 System reference model
See Figure 1 for the system reference model. The main functions of each layer are as follows:
a) MAC layer includes an adaptation sublayer and a MAC sublayer:
1) Adaptation sublayer: mainly provide the mapping and conversion
functions between external network data and the MAC service data unit
(MSDU) in this Part;
2) MAC sublayer: in addition to serving as medium access control
functions, it also includes the management and control of the system and the support for specific functions of PHY.
b) PHY layer: mainly provide PHY transmission mechanism that maps
MAC protocol data unit to corresponding physical channel, using
orthogonal frequency division multiplexing (OFDM) and multiple input
multiple output (MIMO) technologies.
Figure 1 -- System reference model
5 Medium access control layer of communication mode
with center node
5.1 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. In this Part, in order to support multimedium services to have QoS guarantee and efficient transmission, the MAC layer defined in this Part has the following characteristics:
- Use centralized control architecture for multi-user scheduling;
- MAC layer provides connection-oriented services and supports QoS for
different priority services.
MAC layer
PHY layer
Adaptable sublayer SAP
Adaptable sublayer
MAC sublayer SAP
MAC sublayer
PHY layer SAP
PHY layer Ma
na
ge
me
nt
co
ntr
ol
pla
ne
Figure 2 -- Function composition of MAC layer
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:
- Receive the service data unit (SDU) from upper layer;
- Classify the received SDU from upper layer;
- Send the PDU of the adaptation sublayer generated by this layer to MAC sublayer;
- Receive the SDU of the adaptation sublayer in the equivalent entity.
5.3 Medium access control sublayer
The basic functions of the MAC sublayer are divided into the management control plane and the data plane.
The management control plane includes the following functions:
- System configuration: manage system configuration messages and
exchange system configuration information with terminals;
- Radio resource management: mainly complete service scheduling
functions; complete resource allocation based on service parameters and channel conditions; have functions such as load balancing and access
control;
Network layer
Management control plane
System
configuration
management
Network access
management
Wireless resource
management
Mobility
management
Power saving
management
PHY control
Transmission mode
control Link self-adaptation
MAC layer
Data plane
Adaptable sublayer
Fragment / regroup
MPDU generation
MPDU
polymerization
MAC
sublayer
- Network access management: be responsible for initialization and access process; generate messages required for the access process, including
access code selection, capability negotiation;
- Power saving management: manage non-service OBU to enter the sleeping state and return to the active state;
- PHY layer control: mainly include the following sub-functions:
a) Selection of transmission mode:
1) Selection of MIMO working mode;
2) Selection of STBC mode.
b) Self-adaption of link:
1) CQI measurement and feedback;
2) MCS selection and feedback;
3) Power control and management.
The data plane includes the following functions:
- Automatic repeat request (ARQ): confirmation and retransmission of MPDU or fragmented / aggregated MPDU of MAC layer;
- Fragmentation / reassembly: according to the scheduling result, the
sending end performs fragmentation processing on the upper-layer
service data unit and sends it to the next processing module; reorganize multiple fragments at the receiving end;
- MPDU generation: encapsulate upper-layer service units into the basic MAC frame, then send to the next processing module;
- MPDU aggregation: according to the scheduling result, the sending end performs the aggregation operation on the upper-layer service data unit. 5.4 On board unit state
See Figure 3 for the state transfer of OBU in the intelligent transportation system. The OBU state transition diagram includes four states: initial state, access state, connection state, and idle state, as below:
- Initial state: after OBU is powered on, search for physical frame pilots to obtain system synchronization;
- Access state: OBU needs to access the process through synchronization, random access and capability negotiation, including the following three sub-states:
?€? Waiting for the state of random access request to resource allocation: after OBU sends random access code, transfer to the state of waiting for random access request to resource allocation. Wait for RSU to allocate
CCH for sending subsequent random access requests;
?€? Waiting for the state of random access response: OBU uses the
resources allocated by RSU to send all random access request frames
and transfer to the state of waiting for random access response;
?€? Waiting for the state of capability negotiation response: after OBU
receives the random access response message and the assigned CCH,
OBU shall send a capability negotiation request frame and enters a state of waiting for capability negotiation response.
- Connection state: service running state. It allocates the reserved resources for user. It is used for resource application. It shall slightly uplink ACK resources in downlink services to response flow change and delete
request. Transfer to the sleeping state after receiving the sleeping request. After receiving the logout frame, the user shall quit and return to the initial state;
- Idle state: when OBU does not have any access connection, it shall enter the idle state.
See Table 1 for state transfer conditions.
Table 1 -- State transfer conditions
No. Transfer name State before transferring
State after
transferring
Description of transfer
conditions
1 Send random access code Initial state
Waiting for random
access request for
resource allocation
OBU sends random access
code.
2 Send random access request
Waiting for
random access
request for
resource
allocation
Wait for random
access response
OBU receives CCH of random
access request resource
allocation and sends random
access request.
3 Random access success
Wait for random
access
response
Wait for capability
negotiation
response
OBU receives a random access
response frame from RSU.
Completion of
service flow
addition
Wait for
capability Connection state
RSU responses the flow
addition requires of OBU.
Establish service flow for user
negotiation
response
and allocate the reserved
resources for user.
5 Quit Connection state Initial state
RSU receives the logout
request, responds to the user
and deletes the user.
6 Deletion of service flow

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