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1. 发明授权

US5950127A Mode switching method for mobile station 失效
标题翻译：移动台模式切换方式
公开(公告)号：US5950127A
公开(公告)日：1999-09-07
申请号：US698096
申请日：1996-08-15
申请人： Kazumasa Nitta , Takashi Ueda , Yoshiyuki Yasuda , Syunichi Kido
发明人： Kazumasa Nitta , Takashi Ueda , Yoshiyuki Yasuda , Syunichi Kido
IPC分类号： H04B7/185 , H04W48/18 , H04W88/06
CPC分类号： H04W48/18 , H04B7/18563 , H04W88/06
摘要： The ground base station informs an in-level for the ground system, an out-level from the ground system, a timer value and an edge information indicating the edge of the service area, in addition to the broadcast information. It assumes that the mobile station MS moves from position 31 to zone 26 at the edge in the service area, and then moves to position 33. At the position 31, when the received field strength of the ground system decreases, the edge information is not detected, so that the mobile station MS does not switch the communication mode to the satellite system immediately by setting the timer value to three minutes. At position 32, the edge information is detected, so that the mobile station MS sets the timer value to one minute, and sets the out-level to a lower value than the general value. When the field strength is equal to or less than the out-level even after the passage of one minute, the mobile station MS switches the communication mode to the satellite system. Therefore, mode switching does not flap. On the contrary, when the mobile station MS moves from position 33 to position 32, the mobile station MS sets the in-level to a larger value than the general value, so that the flapping of the mode switching is prevented.
摘要翻译：除了广播信息之外，地面基站还通知地面系统的水平，地面系统的水平，定时器值和指示服务区域的边缘的边缘信息。它假定移动台MS在服务区域的边缘处从位置31移动到区域26，然后移动到位置33.在位置31，当地面系统的接收场强减小时，边缘信息不是检测到，使得移动台MS通过将定时器值设置为三分钟来不立即将通信模式切换到卫星系统。在位置32，检测边缘信息，使得移动站MS将定时器值设置为一分钟，并将该外部电平设置为比一般值更低的值。当即使经过一分钟之后场强也等于或小于外电平时，移动台MS将通信模式切换到卫星系统。因此，模式切换不会翻转。相反，当移动站MS从位置33移动到位置32时，移动台MS将电平设定为比通常值更大的值，从而防止模式切换的拍动。

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