5.8g雷达5725-5875 MHZ带中的法规概述
WAS/RLAN in the band 5725-5875 MHz under SRD regulation operated in cars and ITS as well as road tolling (TTT) systems. All these systems operate in the band 5725-5875 MHz at the same or adjacent frequencies.[*]ETSI EN 301 489-1 V2.2.0 (2017-03)，
[*]Final draft ETSI EN 301 489-3 V2.1.1 (2017-03)，
[*]ETSI EN 300 440 V2.1.1 (2017-03），
[*]EN 62479:2010
RLAN: Radio Local Area Networks belong to the class of Wireless Access Systems (WAS), which provide end-user radio connections to core networks. Radio Local Area Networks (RLANs) serve geographically limited areas, and they are predominantly used inside buildings, but not limited to indoor use. This Report specifically studies WAS/RLAN use in cars in the band 5725-5875 MHz that operate under the generic SRD regulations. Use cases for WAS/RLAN in cars include:
[*]Interconnection with smartphones (e.g. Android Auto, Apple CarPlay and MirrorLink);
[*]High speed internet access for smartphones and tablets, where a RLAN access point with cellular backhaul provides internet access to devices inside the vehicle;
[*]Cable replacement for rear-seat entertainment systems. Integral components such as embedded control units are usually not connected over wireless links.
Short Range Devices (SRD): ERC Recommendation 70-03 ANNEX 1: Non-specific short range devices contain the band 5725-5875 MHz (Band j) in the 5 GHz range. Maximum radiated peak power is limited to 25 mW e.i.r.p. No duty cycle limit or maximum PSD/MHz levels are applied in this band for generic SRD use. The EN 300 440 applies to this use. This band is also designated for industrial, scientific and medical (ISM) applications as defined in ITU Radio Regulations.
Intelligent Transport Systems (ITS): ITS are defined in Directive 2010/40/EU as “advanced applications which […] aim to provide innovative services relating to different modes of transport and traffic management and enable various users to be better informed and make safer, more coordinated and ‘smarter’ use of transport networks. ITS integrate telecommunications, electronics and information technologies with transport engineering in order to plan, design, operate, maintain and manage transport systems.”
Road tolling (TTT): In this Report, Road tolling is intended as systems for electronic toll collection that involve communication between road tolling equipment on-board vehicles and fixed road-side infrastructure equipment in the frequency band 5795-5815 MHz.
Overview of 5 GHz Channels for IEEE 802.11
RLAN systems based on IEEE 802.11 are considered in this Report under SRD regulation, which use the frequency band 5725 MHz to 5875 MHz with a maximum output power of 14 dBm (25 mW) e.i.r.p.
Systems based on IEEE 802.11ac use up to 80 MHz wide channels. 20 MHz or 40 MHz channels are supported by IEEE 802.11n devices which are typically used today. It is not possible to use a 160 MHz channel within the frequency band 5725 MHz to 5875 MHz.
Channelisation, considered in this Report, only refers to IEEE 802.11ac. However, Licensed Assisted Access LTE (LAA-LTE) Release 13 uses the same minimum channel bandwidth of 20 MHz and the same channelisation considered by IEEE 802.11ac. EU spectrum regulations do not mandate any particular channelisation or minimum bandwidth.
Short Range Devices (SRD): ERC Recommendation 70-03 ANNEX 1: Non-specific short range devices contain the band 5725-5875 MHz (Band j) in the 5 GHz range. Maximum radiated peak power is limited to 25 mW e.i.r.p. No duty cycle limit or maximum PSD/MHz levels are applied in this band for generic SRD use.
The EN 300 440 applies to this use. This band is also designated for industrial, scientific and medical (ISM) applications as defined in ITU Radio Regulations.
Industrial, scientific and medical (ISM) 5725-5875 MHz
下图是5725-5875 MHz频带中的系统/服务的概述
Abbreviation Explanation
AP Access Point
ASECAP European Association of Operators of Toll Road Infrastructures
AS/ASS Active Sensors
BDA2G Broadband Direct Air To Ground
BFWA Broadband Fixed Wireless Access
BPSK Binary Phase-shift Keying
CCA Clear Channel Assessment
CENELEC European Committee for Electrotechnical Standardization
CEPT European Conference of Postal and Telecommunications Administrations
C-ITS Cooperative Intelligent Transport system
C/N Carrier to noise ratio
CS Carrier Sensing
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
DA2GC Direct Air-to-Ground Communications
DCC Decentralised Congestion Control
DFS Dynamic Frequency Selection
DSRC Dedicated Short Range Communication (as of CEN EN 12253)
EC European Commission
ECC Electronic Communications Committee
ED Energy Detection
EDCA Enhanced Distributed Channel Access
EETS European Electronic Toll Service
e.i.r.p Equivalent isotropic radiated power
ETSI European Telecommunications Standards Institute
FSS Fixed Satellite Service
HEN Harmonised European Standard
IEEE Institute of Electrical and Electronics Engineers
I/N Interference to noise ratio
ISM Industrial, scientific and medical
ITS Intelligent Transport System
ITU International Telecommunication Union
LAA License Assisted Access
LBT Listen Before Talk
LTE Long Term Evolution
MBR Maritime Broadband Radio
MCL Minimum Coupling Loss
MCS Modulation Coding Scheme
NF Noise Floor
OBU On-Board Unit
OFDM Orthogonal Frequency Division Multiplex
P2MP Point-To-Multi-Point communication
P2P Point-To-Point
POD Probability of Detection
PSD Power Spectral Density
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase-shift Keying
RLAN Radio Local Area Network
RSU Road-Side Unit
Rx Receiver
RTTT Road Transport and Traffic Telematics
SRD Short Range Device
SRD/MG Short Range Device / Maintenance Group
TC BRAN Technical Committee Broadband Radio Access Networks
TLPR Tank Level Probing Radar
TPC Transmitter Power Control
TTT Transport and Traffic Telematics
Tx Transmitter
UE User Equipment
WAS Wireless Access System
WG FM Working Group Frequency Management of the ECC
WG SE Working Group Spectrum Engineering of the ECC
WIA Wireless Industrial Applications 5725MHz~5875MHz频段的产品只能受EN 300 440标准限制，其功率仅有25mW，功率太低，传输距离太短存在缺点，新标准的出现对于广大的短距离应用厂商来说，绝对是一件值得关注的大事。
市场需要网络解决方案来适应不同的应用需求，欧盟便于近日正式推出了一个专门关于5725MHz~5875MHz频段的新认证标准，即Draft ETSI EN 303 258 V1.0.6 (2018-01)：Wireless Industrial Applications (WIA); Equipment operating in the 5725 MHz to 5875 MHz frequency range with power levels ranging up to 400 mW; Harmonized Standard for access to radio spectrum.
虽然当前还只是草稿版本，先为您仔细分析一下ETSI EN 303 258的新要求。
1. EN 303 258标准适用于什么类型的设备？
1）WIA设备（无线工业应用设备）。
2）工作在5725 MHz 到 5875 MHz频段范围之内。
3）RF功率不超过400mW(注意是：EIRP)。
4）设备要支持APC（自适应功率控制）功能。
也就是说，当我们的产品同时满足上述四个条件后才可以考虑应用本标准。
2. EN 303 258标准为我们提供了哪些指导？
本文件规定了在5725 MHz至5875 MHz频段工作的无线工业自动化设备的技术特性和测量方法。还规定了频谱共用机制，以便与在5725 MHz至5875 MHz频段工作的其他设备共存。
注：频谱共用机制的规范，是本标准相对于EN 300 440的又一大重要变化。
3. 什么是WIA设备，其应用领域有哪些?
WIA设备是指用于工作在5.8 GHz WIA频段的无线工业应用的无线电设备。主要用于工业自动化应用，其涵盖不同的工业应用领域。
4. 什么是APC功能，其具体要求有哪些？
自适应功率控制（APC）是工业应用中的无线设备使用的一种RF输出功率调整机制，即该机制可用于在产品不需要维持在400 mW高功率运行场景时，将RF输出功率降低至维持可靠链路所需的最小功率，最低可低至25 mW以下。
EN 303 258 标准下载
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