
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]

Antenna feeder system: responsible for sending and receiving signals, including antennas and feeders; RF unit: responsible for signal generation and extraction, my most important part; Baseband unit: responsible for information processing, the core of all components; Supporting system: Provide support for the above-mentioned systems, including iron towers, computer rooms, power-supply air conditioners and other equipment. [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]

Asset management company Communication & Renewable Energy Infrastructure (CREI) has signed financing agreements worth a combined US$20 million to fund its telecommunications energy service company (ESCO) project in South Sudan.The project involves developing, building, operating and maintaining hybrid power solutions including solar for 413 telecoms sites across the country. [pdf]
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