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个人通信是指任何人能随时随地不受时空限制与世界上其他任何人进行的理想通信。要完全实现个人通信的理想，必须有一个渐进的过程。当今任何地面蜂窝网都不能真正满足人们的这一要求。因为要实现个人通信必须扩大地面蜂窝区的覆盖，增设大量的基站，这就需要大量投资，因此地
Personal communication means the ideal communication anyone can make with anyone in the world, regardless of time and space constraints. To fully realize the ideal of personal communication, there must be a gradual process. Any terrestrial cellular network today can not really meet people’s needs. Because of the need to expand the coverage of terrestrial cells for the purpose of personal communications, adding a large number of base stations requires a significant investment,