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    • 8. 发明授权
    • Wireless communication terminal and control method thereof
    • 无线通信终端及其控制方法
    • US07818021B2
    • 2010-10-19
    • US11572631
    • 2005-07-28
    • Mitsuhiro KitajiTakashi Matsumura
    • Mitsuhiro KitajiTakashi Matsumura
    • H04B7/00
    • H04W52/36H04B1/3816
    • In a PC card communication terminal that operates supplied with power from a host device, problems such as malfunctions due to a supply voltage drop at the time of high transmission output are prevented from occurring. A baseband processor (1106) selects a transmission-power upper-limit measurement mode when a PC card terminal (1103) is to be controlled for the first time. A supply voltage drop is measured by a voltage measurement circuit (1114) while a load value of a load circuit (1112) is being changed. The load value of the load circuit (1112) when the supply voltage decreases to a permissible lowest supply voltage is obtained. Using a conversion table stored in a memory (1107), the load value is converted into a transmission output and is set as a transmission-output upper limit. In a normal communication mode, a maximum transmission output is restricted based on this transmission-output upper limit.
    • 在从主机装置供电的PC卡通信终端中,防止由于高传输输出时的电源电压下降而导致的故障等问题。 当首次要控制PC卡终端(1103)时,基带处理器(1106)选择发送功率上限测量模式。 当负载电路(1112)的负载值正在改变时,由电压测量电路(1114)测量电源电压降。 获得当电源电压降低到允许的最低电源电压时负载电路(1112)的负载值。 使用存储在存储器(1107)中的转换表,将负载值转换为发送输出,并将其设置为发送 - 输出上限。 在正常通信模式中,基于该传输输出上限来限制最大传输输出。