A COMMUNICATION SYSTEM

摘要

An airport communication system 1 has a tag 10 affixed by a clip 12 to each passenger en route between check-in and boarding. Each tag 10 transmits an identifier on a particular RF channel with a short range, and the location of a transponder 5 which received the transmission indicates passenger location. A server 4 correlates tag and passenger identifiers and generates alerts if alert conditions are met such as excessive distance from a boarding gate at a particular time.