
A base station (BTS or NodeB/eNodeB/gNodeB) is the antenna site your phone connects to.If the SMS system (SMSC or signaling network) logs show “Unknown Base Station,” it usually means:The cell ID or location area code (LAC) is missing or invalid.The base station ID isn’t mapped in the operator’s Home Location Register (HLR) or Visitor Location Register (VLR).The subscriber was roaming, and the network couldn’t resolve the roaming partner’s base station information. [pdf]

shortwave communication Compared with satellite communications, terrestrial microwave and other means of communication, shortwave communication has many significant advantages: Shortwave communication does not require the establishment of relay stations to achieve long- distance communications, low construction and maintenance costs and low operating costs. [pdf]

Micro inverters can be connected to the wireless router through the built-in Wi-Fi module, string inverters and energy storage inverters can be connected to the wireless router through the external Wi-Fi data collector, the Wi-Fi module or data collector will transmit the data of the inverter operation to the server, and can also be connected to the Wi-Fi of the inverter through the mobile phone or computer. [pdf]

The current national policies and technical requirements related to electromagnetic radiation administration of mobile communication base stations in China are described, including laws and regulations on electromagnetic radiation management, electromagnetic environmental impact assessment system for mobile communication base stations, technical standards, etc.. [pdf]
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