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    • 6. 发明授权
    • Power saving mobile data communication system using adaptors
    • 省电移动数据通信系统使用适配器
    • US5682417A
    • 1997-10-28
    • US454744
    • 1995-05-31
    • Toshio Nitta
    • Toshio Nitta
    • H04B7/26H04W52/02H04Q7/18H04Q7/36
    • H04W52/0225Y02B60/50
    • In a cellular mobile communication system, a first adaptor is connected to a data terminal to convert the output of the modem of the data terminal to a baseband data signal, and determines the absence or presence of the baseband data signal and produces a data absence signal or a data presence signal. A mobile unit is connected to the first adaptor to transmit the baseband data signal or the data absence signal on a voice frequency carrier to one of cellsite base stations, deactivates itself following the transmission of the data absence signal, and reactivates itself in response to the data presence signal. A second adaptor is connected to a mobile telephone switching system for receiving the baseband data signal and the data absence signal. The second adaptor includes an idle flag generator responsive to the data absence signal for generating an idle flag until it receives a baseband data signal. A modem is provided in the second adaptor for modulating the idle flag or baseband data signal on a voice frequency carrier. The mobile telephone switching system is responsive to a dialing signal from the mobile unit for establishing a connection from the base station to the input of the second adaptor and a connection from the output of the second adaptor to a destination terminal via a public switched telephone network to transmit the modulated carrier from the second adaptor.
    • 在蜂窝移动通信系统中,第一适配器连接到数据终端以将数据终端的调制解调器的输出转换为基带数据信号,并确定基带数据信号的不存在或不存在,并产生数据不存在信号 或数据存在信号。 移动单元连接到第一适配器以将语音频率载波上的基带数据信号或数据不存在信号发送到小区基站之一,在数据不存在信号的传输之后自动停用,并且响应于 数据存在信号。 第二适配器连接到用于接收基带数据信号和数据不存在信号的移动电话交换系统。 第二适配器包括响应于数据不存在信号的空闲标志发生器,用于产生空闲标志直到接收到基带数据信号。 在第二适配器中提供调制解调器,用于调制语音频率载波上的空闲标志或基带数据信号。 移动电话交换系统响应于来自移动单元的拨号信号,用于建立从基站到第二适配器的输入的连接以及经由公共交换电话网从第二适配器的输出到目的地终端的连接 以从第二适配器传输调制载波。