Handoff control method and a mobile station employing the same
AssigneeHitachi, Ltd.
InventorsShigeyuki Sudo, Yukinori Asada, Yoshinori Chida, Fumiharu Nakahara
Life of this patent
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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 a 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.
Claims17
A method of controlling registration of a mobile station used in a CDMA mobile communication system, said method comprising the steps of:
- performing a pilot synchronization operation including an acquisition of a pilot signal;
- detecting the result of a registration of said mobile station with a wireless base station for a coverage area in which said mobile station is present;
- retrying the registration when the result is unsuccessful after inhibiting switching to a good pilot signal that is being idly received;
- pausing transmitting and receiving operation of said mobile station for a predetermined time when said retried registration is unsuccessful;
- resuming registration processing when the predetermined time pause ends;
- and
- acquiring a new pilot signal when the registration processing is resumed.
A method of controlling registration of a mobile station used in a CDMA mobile communication system, said method comprising the steps of:
- performing a pilot synchronization operation including an acquisition of a pilot signal;
- performing a registration operation for registering said mobile station with a wireless base station for a coverage area in which said mobile station is present;
- detecting a result of the registration operation attempting to register said mobile station with said wireless base station;
- retrying the registration operation when the result is unsuccessful after inhibiting switching to a good pilot signal that is being idly received;
- pausing a transmitting operation and a receiving operation of said mobile station for a predetermined time when said retried registration is unsuccessful;
- resuming the registration operation under predetermined conditions when the predetermined time ends;
- and
- acquiring a new pilot signal when the registration operation is resumed.
A mobile station for use in a CDMA mobile communication system comprising:
- a receiver which receives a wireless signal transmitted by a sector or a base station;
- a CDMA modem connected to the receiver, which performs a despreading demodulation operation of the wireless signal received by the receiver;
- and
- a controller which controls a pilot synchronization operation including an acquisition of a pilot signal and a registration operation that includes a plurality of access sequences to the sector or the base station when the acquisition of a pilot signal is successful, and turns off the receiver and turns on an indicator to indicate that the mobile station is out of the coverage area even though the acquisition of the pilot signal is successful when the mobile station fails in registration to the sector or the base station after the registration operations are performed a predetermined number of times.
A method of controlling registration of a mobile station used in a CDMA mobile communication system, said method comprising the steps of:
- receiving at a receiver of the mobile station a wireless signal transmitted by a sector or a base station;
- performing at a CDMA modem connected to the receiver a despreading demodulation operation of the wireless signal received by the receiver;
- and
- controlling a pilot synchronization operation, said pilot synchronization operation including acquisition of a pilot signal and a registration operation that includes a plurality of access sequences to the sector or the base station when the acquisition of a pilot signal is successful;
- and
- turning off the receiver and turning on an indicator to indicate that the mobile station is out of the coverage area even though the acquisition of the pilot signal is successful when the mobile station fails in registration to the sector or the base station after the registration operations are performed a predetermined number of times.
A mobile station for use in a CDMA mobile communication system comprising:
- a receiver which receives a wireless signal transmitted by a sector or a base station;
- a CDMA modem connected to the receiver, which performs a despreading demodulation operation of the wireless signal received by the receiver;
- a transmitter which transmits a wireless signal to the sector or the base station;
- and
- a controller which controls the receiver so as to acquire a pilot signal and the transmitter so as to perform a registration operation that includes a plurality of access sequences to the sector or the base station when the acquisition of a pilot signal is successful, turns off the receiver and the transmitter and turns on an indicator to indicate that the mobile station is out of the coverage area even though the acquisition of the pilot signal is successful when the mobile station fails in registration to the sector or the base station after the registration operations are performed a predetermined number of times, and shifts to a sleep mode after turning off the receiver and the transmitter.
Dependencies are inferred from the claim text.