YD/T 5255-2023 in English

Background of the evolution of eMTC technical standards

As a key technology for the evolution of LTE to the IoT scenario, eMTC (enhanced Machine-Type Communication) fills the gap between traditional cellular networks and LPWA technology through three major features: enhanced coverage (15dB gain), reduced power consumption (10-year battery life), and support for massive connections (50,000 terminals in a single cell). This specification systematically defines the technical requirements for the entire process of engineering construction for the first time.

Key Points in Core Network Architecture Design

Key technical indicators of wireless networks

The specification clearly requires that the following must be met when networking at the same frequency:

• RSRP ≥ -115dBm coverage probability ≥ 90%
• SINR ≥ -3dB guarantee probability ≥ 90%
• RRC connection success rate ≥ 95%

Interference coordination: Through the optimized design of PCI mod3/mod6/mod30, the interference of key signals such as P-SS and DM RS can be reduced by 60%.

Implementation suggestions and evolution path

1. Frequency reuse: 800/900MHz low frequency band is preferred to achieve wide coverage
2. Site sharing: The hardware reuse rate of existing LTE base stations can reach more than 70%
3. Security architecture: It needs to meet the requirements of Level 3 of Information Security Protection 2.0 and deploy end-to-end encryption

With the evolution of 3GPP R17 standards, it is recommended to reserve space for 5G NR-IoT compatibility upgrade