Handoff control method and a mobile station employing the same
AssigneeHitachi, 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 the waste of battery power 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.
Claims5
A mobile station comprising:
- a receiver which receives a plurality of pilot signals transmitted by a plurality of sectors respectively, wherein PN phases of the plurality of sectors are different from each other;
- a demodulator which demodulates the pilot signals received by the receiver;
- and
- a transmitter which transmits a signal for performing a registration to one of the plurality of sectors selected based on a strength of the pilot signals demodulated by the demodulator;
- wherein when the registration to the selected sector is unsuccessful, a new sector is selected from the plurality of sectors by shifting a PN phase position from a PN phase position of the selected sector toward a phase advanced direction, and the transmitter transmits a signal for performing a registration to the new sector.
A method of controlling registration of a mobile station, the method comprising the steps of:
- receiving a plurality of pilot signals transmitted by a plurality of sectors respectively, wherein phases of the plurality of sectors are different from each other;
- demodulating the received pilot signals;
- transmitting a signal for performing a registration to one of the plurality of sectors selected on the basis of a strength of the demodulated pilot signals;
- selecting a new sector from the plurality of sectors by shifting a PN phase position from a PN phase position of the selected sector toward a phase advanced direction when the registration to the selected sector is unsuccessful;
- and
- transmitting a signal for performing a registration to the new sector.
Dependencies are inferred from the claim text.