Hitachi, Ltd.

Samsung Electronics Co., Ltd.

Casio Hitachi Mobile Communications Co., Ltd.

Shigeyuki Sudo

Osamu Hasegawa

Toshiya Eguchi

Yasuaki Takahara

Fumiharu Nakahara

Yukinori Asada

Yoshinori Chida

Teiji Okamoto

Jun Yamada

Toru Tanaka

Kazutoshi Higuchi

Hidenori Sakaniwa

Katsumi Takeda

Osamu Hikino

Tomohiro Esaki

Tatsuo Horikoshi

Taketoshi Arakawa

Takashi Itamiya

Norikazau Takahashi

Yoshiaki Umehara

Tomohiro Ezaki

Kuniaki Akatsuka

Shuuichi Sekiguchi

Masaru Uemura

Takashi Iida

Shinji Ueno

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 S), idle handoff is inhibited (step S). The mobile station shifts to a registration-waiting sleep mode (step Sand state ST) 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 Stimes out, registration is resumed under certain conditions. On resumption, a new pilot signal is acquired.

Handoff control method and a mobile station employing the same

A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces 0V(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.

Receiver for receiving a spectrum dispersion signal

An access point diagnosis unitcontrols a radio access terminal portionincluded in the access point, to execute a test of connection with the access point. A switch within the access point selectively connects the radio access terminal portion, with any of an antenna and radio reception parts of the own access point. In accordance with a failing part, the failure information which contains the failing part and/or a failure content is transmitted from the radio access terminal portionto the radio access terminal(1) along a first path tracing the radio reception part connected by the switch, etc. of the access point, or (2) along a second path tracing the antenna connected by the switch and the other access point

Access point

Location positioning setting information is read from a setting storage section when the user depressed a power key. The location positioning setting information comprises setting information, such as the maximum duration time of the location positioning operation and the operation timing when a power-off event has been generated. A control section turns off the power of a display section, a speaker, a microphone, etc., excluding a communication function for transmitting location positioning and positioning results. In this state, a location positioning section acquires the positional information of the mobile communication terminal. Then, a wireless communication section transmits the location positioning information of the positioned mobile communication terminal to a predetermined monitoring server which manages the positional information of the mobile communication terminal.

Mobile communication terminal and position monitoring method

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 S), idle handoff is inhibited (step S). The mobile station shifts to a registration-waiting sleep mode (step Sand state ST) 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 Stimes out, registration is resumed under certain conditions. On resumption, a new pilot signal is acquired.

A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces OV(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.

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 S), idle handoff is inhibited (step S). The mobile station shifts to a registration-waiting sleep mode (step Sand state ST) 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 Stimes out, registration is resumed under certain conditions. On resumption, a new pilot signal is acquired.

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period tby means of a low-power timerso that a VC-TCXOa reference signal group generation unitand a receiving unitare turned off and a modem unitis set to a sleep state. Upon resumption of receiving operation, a high-accuracy timeris supplied with a start (d) to require counting of time tand a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculatorduring a period tto obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time tare calculated on the basis of the indication value i to be set. When the high-accuracy timercounts tand produces 0V(d), demodulation operation by a rake demodulation unita demultiplexing unitand a descrambler unitis started in accordance with the setting and is continued during the reception time t

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period tby means of a low-power timerso that a VC-TCXOa reference signal group generation unitand a receiving unitare turned off and a modem unitis set to a sleep state. Upon resumption of receiving operation, a high-accuracy timeris supplied with a start (d) to require counting of time tand a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculatorduring a period tto obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time tare calculated on the basis of the indication value i to be set. When the high-accuracy timercounts tand producesV(d), demodulation operation by a rake demodulation unita demultiplexing unitand a descrambler unitis started in accordance with the setting and is continued during the reception time t

A mobile station for preventing reduction of the line quality when it is used near the head of a human operator. Plural antennas are arranged so that the cross-correlation of the received waves becomes small. The signals received by the antennas are delayed by a delay time to prevent interference between the received signals so that the time difference of each received signal becomes at least one chip time of the spreading code or more. After that, a combiner combines the received signals, and an output signal of the combiner is inputted into a rake receiver. A reduction of the extent of the delay spreading is prevented by directivity of the antennas in use near a human body, and a decline of path diversity gain by the rake receiving is reduced.

Mobile station for spread spectrum communication

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period t by means of a low-power timer so that a VC-TCXO , a reference signal group generation unit and a receiving unit are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is supplied with a start (d) to require counting of time t and a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculator during a period t to obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time t are calculated on the basis of the indication value i to be set. When the high-accuracy timer counts t and produces 0V(d), demodulation operation by a rake demodulation unit , a demultiplexing unit and a descrambler unit is started in accordance with the setting and is continued during the reception time t

A speech message recording and reproducing method and apparatus wherein a speech message associated with a facsimile transmission is stored in a communication apparatus having an automatic answering telephone apparatus associated with a facsimile apparatus. Information of the speech apparatus including at least a storage address thereof is converted to an optical pattern for printing on a recording paper. The printed optical pattern is optically detected, interpreted and transmitted by radio communication to the communication apparatus and the speech message stored at the storage address is reproduced. The optical pattern is read by a reader forming part of a portable telephone unit.

Speech message recording and reproducing method and apparatus

The number of oscillators required to construct a digital radiocommunication terminal can be reduced and a circuit used for the digital radiocommunication terminal can be reduced in size. For this purpose, the digital radiocommunication terminal for effecting information transmission using an N (integer)-phase-shift-keyed signal (identification symbol number N=4 upon .pi./4 shifted QPSK modulation), is constructed such that an oscillation frequency generated from a reference oscillator employed with a frequency synthesizer is selected to have a common multiple of a second intermediate frequency and an identification symbol phase N and is supplied to a detector for outputting received data therefrom.

Growing community of inventors

Yokohama, Japan

Shigeyuki Sudo