Denso Corporation

Hiroyasu Ogino

Atsushi Hayashida

Michio Shamoto

Tatsuya Shintai

Toshihiro Takeuchi

Kyoji Oda

Tsutomu Hayashi

Ryohei Matsui

An in-vehicle wireless terminal is disclosed. The in-vehicle wireless terminal includes a disconnection detection section for detecting whether an antenna is disconnected, and a determination section for determining whether the vehicle is located within a predetermined distance from a wireless base station. The in-vehicle wireless terminal further includes a control section configured to set transmission power to a maximum value to perform data transmission to the wireless base station if the disconnection detection section detects that the antenna is disconnected and if the determination section determines that the vehicle is located within the predetermined distance from the wireless base station.

In-vehicle wireless communication terminal

A mobile communications terminal has a transmitter for transmitting a specific identification code of a reference base station as a time reference for network position determination. Therefore, a position server connected with a CDMA network can distinguish the reference base station from the other base stations regardless of positioning relationship between the mobile terminal and the base stations.

Mobile communications terminal with position determination

A wireless terminal is designed to prevent the user from having to wait a long time in case fetching of search data takes a long time. The wireless terminal, if it determines the need of long time for the search of GPS satellites by a GPS transceiver, inhibits the GPS transceiver from searching GPS satellites and operates on a CDMA transceiver to search for CDMA base stations. The wireless terminal fetches only CDMA base station data pertinent to the CDMA base stations and sends to a position data server, and the position data server points the location of the wireless terminal based solely on the CDMA base station data provided by the wireless terminal. Based on the inhibition of search of GPS satellites by the GPS transceiver, the time needed until the reception of positioning result can be reduced, and the user is prevented from being subjected to long time waiting.

Wireless terminal

In a mobile station, a period for receiving a GPS signal from a predetermined satellite based on data for satellite reception is set up by a timer, and the GPS signal whose reception level is higher than a threshold value is awaited. Until elapsed time reaches a preset time, indoor counter is incremented if the GPS signal is unable to be received or outdoor counter is incremented if the GPS signal is able to be received. When each counter reaches a specified value, each mode is determined. If the mode is different from a previous mode, a mode shift is executed and setups of user interfaces, display, speaker and others, are altered for the updated mode, indoor or outdoor.

Mobile station having indoor/outdoor mode shifting function

A wireless terminal has the enhanced performance in the attainability of successful search of GPS satellites based on the operation of a position data server. The server sets a GPS satellite search time longer than usual when station data pertinent to surrounding stations is below a prescribed level, when the distance between the wireless terminal and a communication station is beyond a prescribed distance, when the wireless terminal is in such a specific area as seashore, or when a reference station or the communication station is a repeater station. The server sends data of the longer search time to the wireless terminal via the communication station. Setting a GPS satellite search time longer than usual prevents the deviation of the ideal search timing, which enables the optimal search of GPS satellites, out of the search time set by the position data server.

Positioning system of wireless terminal

A control unit executes base station information collection, acquires base station information collection results, and transmits the base station information collection results to a position server via a radio communications network. A memory stores the base station information collection result. A counter counts a predetermined time. The control unit makes the counter count the predetermined time and makes the memory store the base station information collection result during a time counted by the counter when the base station information collection is started. The control unit then acquires the base station information collection results from the memory after the counter finishes the counting, and transmits the base station information collection results to a position server via the radio communications network.

A mobile communication terminal stores positioning information including global positioning system signals and base station information required by a position server in a communication network to calculate the terminal position. When the position server calculates the terminal position based on these positioning unit information, the position information is not reported to the user if the indefinite information equivalent to a positioning error contained in the average value calculated for the terminal position information exceeds a predetermined threshold value. When the average processing count exceeds a maximum positioning count, that average value is reported to the user.

Mobile communication terminal and method having calculated terminal position uncertainty check function

A radio communication terminal is used in a position specifying system, in which both retrieval timing and retrieval time of each of GPS satellites are received via a communication base station from a position information server. The position information server specifies a position of the radio communication terminal based upon at least GPS satellite information received from the radio communication terminal. The radio communication terminal corrects at least any one of both retrieval timing and retrieval time so that the retrieval timing is moved, or the retrieval time is prolonged. The radio communication terminal retrieves the GPS satellites based upon the corrected retrieval timing and the corrected retrieval time.

Radio communication terminal and position specifying system

A mobile station requests a start of positioning and receives a response of positioning from a positioning server, following which it informs the positioning server of its own station information and neighboring base station information gathered through searching the neighboring base stations. Thereby, the mobile station receives assistant information regarding GPS satellites to be captured based on a station location designated by the positioning server and then it measures a GPS signal and a base station signal such as an apparent signal delay. In the case that the positioning information collected as described above is sufficient for location computing, it displays the location computed by the positioning server. In contrast, in the case that the positioning information is insufficient, it displays 'positioning impossible' without sending the positioning information to the positioning server.

Mobile station and its program

A cellular phone receives a position measurement result, which indicates a position of the cellular phone determined based on both GPS satellite information and CDMA base station information, from a location information server. Then, when a value indicated by uncertainty information of the position measurement result is greater than a first threshold value, the cellular phone receives another position measurement result, which indicates the position of the cellular phone determined based only on the CDMA base station information, from the location information server and displays it on a display device.

Wireless communications terminal, computer program executable by wireless communications terminal and method for outputting positional information from wireless communications terminal

Growing community of inventors

Okazaki, Japan

Hiroyasu Ogino