Handoff control method and a mobile station employing the same
AssigneeSamsung Electronics Co., Ltd.
InventorsShigeyuki Sudo, Yukinori Asada, Yoshinori Chida, Fumiharu Nakahara
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Abstract
There is disclosed a handoff control method for registering a CDMA mobile station in such a way that battery power wastage is prevented if successive attempts to register the station fail. If it is judged that registration fails (step S106), idle handoff is inhibited (step S107). The mobile station shifts to a registration-waiting sleep mode (step S108 and state ST10) in which the sending and receiving operation of the mobile station is paused for a given time. When a sleep timer that is set in the step S108 times out, registration is resumed under certain conditions. On resumption, a new pilot signal is acquired.
Claims9
A mobile station comprising:
- a receiver which receives a pilot signal transmitted by a sector;
- a demodulator which demodulates the pilot signal received by the receiver;
- and
- a controller which selects one of a plurality of sectors when the receiver receives a plurality of pilot signals from the plurality of sectors and executes a registration operation that includes a plurality of access sequences to the selected sector;
- wherein when the mobile station fails in registration to the selected sector after the registration operations are performed a predetermined number of times, the controller executes the registration operation to a new sector different from the selected sector, and
- wherein PN phases of the plurality of sectors are different from each other, and the new sector is selected by shifting a PN phase position from a PN phase position of the selected sector toward a phase advanced direction.
A mobile station comprising:
- a receiver which receives a pilot signal transmitted by a sector;
- a demodulator which demodulates the pilot signal received by the receiver;
- and
- a controller which selects one of a plurality of sectors when the receiver receives a plurality of pilot signals from the plurality of sectors and executes a registration operation that includes a plurality of access sequences to the selected sector;
- wherein when the mobile station fails in registration to the selected sector after the registration operations are performed a predetermined number of times, the controller executes the registration operation to a new sector different from the selected sector, and
- wherein when the mobile station fails in registration to the selected sector, the controller turns on an indicator to indicate that the mobile station is out of the coverage area.
Dependencies are inferred from the claim text.