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随着无线接入技术的飞速发展与移动终端的不断小型化，以数字蜂窝、无绳电话、寻呼以及卫星通信等为代表的第2代移动通信系统迅速发展，目前已能提供多种业务，并占据了相当的市场。从本质上看，它们只能提供终端对终端的移动通信业务，而不是个人对个人的通信。针对这一情况，
With the rapid development of wireless access technology and the continuous miniaturization of mobile terminals, the second generation mobile communication systems represented by digital cellular, cordless phones, paging and satellite communications have been rapidly developed and are now capable of providing a variety of services, And occupy a considerable market. Essentially, they provide only end-to-end mobile communication services, not individual-to-individual communication. In response to this situation,