Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-08-15
1999-09-07
Le, Thanh Cong
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455427, 455552, H04B 7185
Patent
active
059501278
ABSTRACT:
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.
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Kido Syunichi
Nitta Kazumasa
Ueda Takashi
Yasuda Yoshiyuki
Banks-Harold Marsha
Cong Le Thanh
Mobile Communications Network Inc.
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