Sanyo Electric Co., Ltd.

Sanyo Co., Ltd.

Masayoshi Masuda

Michiyuki Yamaoka

Masahide Akao

Masahiro Izaki

Kiyoshi Okada

Yoichi Kakimoto

Provided is a mobile station that a user is able to use without inconvenience, and that is able to realize power consumption saving. The mobile station: records a speech-communication history including information identifying a time at which speech communication occurred; decides a cycle changing time and a cycle-after-change based on the speech-communication history, the cycle changing time being a time at which a paging channel monitoring cycle used by a base station in message transmission is to be changed, and the cycle-after-change being a cycle at which the paging channel is to be monitored after the change; notifies the base station of a slot cycle index indicating the decided cycle-after-change when the decided cycle changing time has come; and starts monitoring the paging channel at the decided cycle-after-change when the decided cycle changing time has come.

Mobile station

A cellular telephone () that searches for a destination base station in accordance with a handoff instruction receives a soft handoff instruction or a hard handoff that is able to specify a first search window size. When the hard handoff instruction is received, a search block () is controlled so that a window control block () searches for pilot signals from neighboring base stations using a search window having a size larger than one of the first search window size and a third search window size that is used when the soft handoff instruction is received.

Cellular telephone

With a mobile terminal which is adapted to receive a message transmitted by radio through the telephone network and to store the message in the nonvolatile member and to show the message on a display, when energized, checksum for the message stored in the nonvolatile memory is calculated to store the result in a RAM. When a message is thereafter received, checksum for the received message is compared with a plurality of checksums stored in the RAM, respectively. The subject to be compared is the only stored message having the same checksum as that for the received message, and the messages are compared. When the messages are same, the received message is stored in the nonvolatile memory by overwrite. As a result, a check for a message duplicate can be performed within a shorter period of time.

Growing community of inventors

Sakai, Japan

Masayoshi Masuda