Countermeasures to Compensate Blocking of Radiowaves for Satellite Communication Systems
- Technological fields
- Telecommunications Network Technologies
- Keyword
- Satellite communication
- Layer3 diversity
- Gap filler
- Laboratory organization
- NTT Access Network Service Systems Laboratories
Overview
In the case that satellite communication is used for vehicles moving on the ground (such as cars and trains), it is a problem that the radio waves transmitted from the satellite are blocked by various large and small obstructions (like buildings and tunnels) and, consequently, communication quality is degraded.
As for the developed system, transmission is stabilized by utilizing two technologies as a solution to address the problem of satellite-communication interruption due to obstructions, and a higher-quality satellite-communication service for moving vehicles is thereby provided.
Features
- Layer 3 diversity system
- Technology for handling small obstructions like buildings
- Data received from multiple channels is selected on the IP layer
- Seamless communication is made possible
- Gap-filler system
- Applicable to long obstructions like tunnels
- Satellite-communication data received outside a tunnel is relayed to the train by a separate wireless system
- Data is selected in combination with a layer 3 diversity system
Application scenarios
- Internet services can be provided in a train moving at high speed
- Internet service is provided for company buses, etc.
