GB/T 38618-2020 in English
VALIDInformation technology—Telecommunications and information exchange between systems—Specification for high reliability and low latency wireless network communication protocol
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
| Standard No: | GB/T 38618-2020 |
| Document status: | VALID |
| Title in English: | Information technology—Telecommunications and information exchange between systems—Specification for high reliability and low latency wireless network communication protocol |
| Title in Chinese: | 信息技术 系统间远程通信和信息交换高可靠低时延的无线网络通信协议规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-04-28 |
| Implemented on: | 2020-11-01 |
| ICS Classification: | 35.110-Networking |
| Chinese Classification: | L79-Opening and system interconnection of computer |
| Professional Classification: | GB-National Standard |
| Related Keywords: | low latency wireless network communication protocol introduction analysis
industrial wireless network wia wireless communication networks information technology telecommunications high reliability requirements |
| Related Topics: | low information throughput
extended when remote Remote extension time Remote time extension network delay altitude information GBT38618 GB/T 38618-2020 |
《GB/T 38618-2020信息技术 系统间远程通信和信息交换高可靠低时延的无线网络通信协议规范》由TC28（全国信息技术标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
GB/T38618-2020 specifies the physical layer operation requirements (including 433MHz, 470-510MHz and 780MHz frequency bands) and data link layer architecture of wireless communication networks in industrial scenarios, focusing on solving the high reliability requirements of packet error rate ≤1% and end-to-end delay ≤50ms.
Key technologies of the physical layer
| Frequency band | Modulation mode | Receive sensitivity | Anti-interference requirements |
|---|---|---|---|
| 433MHz | GFSK | -110dBm | Adjacent channel suppression -50dBm |
| 470-510MHz | GFSK/OFDM | -107dBm | Non-adjacent channel suppression -35dBm |
| 780MHz | O-QPSK | -100dBm | Time Slot Hopping (TH) Mechanism |
Typical Application Case
In the smart factory, the 433MHz device uses adaptive frequency switching (AFS) technology to reduce the packet error rate by 62% when coexisting with Wi-Fi networks in the 2.4G frequency band.
Innovative design of data link layer
Time synchronization mechanism
- Beacon frame synchronization: Basic synchronization accuracy ±1ms
- Command frame synchronization: Secondary synchronization can reach ±50μs
- Multi-hop compensation algorithm: Through crystal oscillator drift fitting, the synchronization error of thousands of points network is controlled within ±200μs
Communication resource scheduling
| Scheduling type | Applicable scenarios | Time slot utilization |
|---|---|---|
| Deterministic scheduling | Process control | ≥85% |
| Adaptive Frequency Hopping (AFH) | Strong Interference Environment | 72-78% |
Implementation Recommendations
- Network Planning Phase: Select TSCH or LLDN frame format according to the density of on-site equipment
- Channel Assessment: It is recommended to update the channel blacklist every 15 minutes
- Superframe Configuration: The ratio of management superframe to data superframe time slot is recommended to be 1:3
Note: The drafting units of the standard include Chongqing University of Posts and Telecommunications, China Electronics Technology Standardization Institute and other institutions, and it integrates the technical advantages of industrial wireless network WIA and IEEE802.15.4.
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