JP2008224657A5

JP2008224657A5 -

Info

Publication number: JP2008224657A5
Application number: JP2007338825A
Authority: JP
Filing date: 2007-12-28
Publication date: 2011-01-13

Claims

A mobile terminal comprising a positioning unit that receives a satellite signal from a positioning satellite and measures the current position, and a wireless communication unit that performs wireless communication while performing handover between base stations installed in various places A current position estimation method for estimating the current position of
Storing a positioning position last measured by the positioning unit and a communication status including at least identification information of a base station wirelessly communicated by the wireless communication unit at the end of positioning by the positioning unit;
When positioning restart of the positioning unit, comparing and determining the current wireless communication communication status by the wireless communication unit and the stored communication status;
Estimating the stored positioning position as the current position of the mobile terminal when it is determined to match by the comparison determination;
Current position estimation method including

The storing is to include a combination of base stations of communication counterparts of the wireless communication unit at the end of positioning of the positioning unit in the communication status,
The comparison determination is to compare and determine the combination of the base station of the current communication partner by the wireless communication unit and the combination of the stored base stations.
The current position estimating method according to claim 1.

The comparison determination includes the same femtocell base station in each of the base station of the current communication partner and the stored base station by the wireless communication unit, or the current communication partner of the wireless communication unit Determining whether the base station and the stored base station are the same femtocell base station;
The estimation of the current position includes the same femtocell base station when it is determined that the same femtocell base station is included in the determination or the same femtocell base station. Including reading position information from a storage unit storing position information of a base station capable of wireless communication by the wireless communication unit, and estimating a position indicated by the read position information as a current position of the mobile terminal,
The current position estimating method according to claim 2.

If it is possible to communicate with the same femtocell base station or another femtocell base station after estimating the position of the same femtocell base station as the current position of the mobile terminal, 4. The current position estimation method according to claim 3, further comprising: estimating a position of the femtocell base station capable of communication as a current position of the mobile terminal while communication with the cell communication base station is possible.

The storing includes storing the combination of base stations of communication partners of the wireless communication unit at the end of positioning of the positioning unit and the radio wave state between the base stations in the communication state. ,
The comparison determination is to compare and determine the combination of the current communication partner base station by the wireless communication unit and the radio wave state between the base station and the stored base station combination and radio wave state.
The current position estimating method according to claim 1.

The comparison determination is performed when the combination of the base station of the current communication partner by the wireless communication unit and the combination of the stored base stations are the same, and the difference in radio wave condition satisfies a predetermined approximate condition, It is to determine that the communication status of the current wireless communication by the wireless communication unit is the same as the stored communication status,
The estimation of the current position is based on the stored bases when it is determined by the comparison determination that the combination of base stations is the same, but the difference in radio wave condition does not satisfy the predetermined approximate condition. 6. The current position estimation method according to claim 5, further comprising: estimating the current position by correcting the stored positioning position based on a radio wave condition with a station and a current radio wave condition.

The estimation of the current position is based on the base station that is not the stored base station among the base stations of the current communication partner when the comparison determination determines that a part of the combination of base stations is the same. Reading position information from a storage unit storing position information of a base station capable of wireless communication by the wireless communication unit, and correcting the stored positioning position with the read position information to estimate a current position The present position estimating method according to any one of claims 2 to 6, comprising:

The positioning unit performs positioning by varying the calculation accuracy according to the reception status of the satellite signal,
The storing includes further storing the calculation accuracy of the positioning unit at the end of positioning,
Determining whether or not the stored calculation accuracy satisfies a predetermined accuracy condition when resuming positioning of the positioning unit;
The estimation of the current position is not to estimate the current position when it is determined that the predetermined accuracy condition is satisfied, and to estimate the current position when it is determined that the predetermined position is not satisfied.
The current position estimation method according to any one of claims 1 to 7.

A mobile terminal comprising a positioning unit that receives a satellite signal from a positioning satellite and measures the current position, and a wireless communication unit that performs wireless communication while performing handover between base stations installed in various places A positioning method performed by the positioning unit of
A positioning method for performing positioning based on the received satellite signal, with the current position estimated by the current position estimating method according to claim 1 as an initial position.

A mobile terminal comprising a positioning unit that receives a satellite signal from a positioning satellite and measures the current position, and a wireless communication unit that performs wireless communication while performing handover between base stations installed in various places Because
A storage control unit that stores a positioning position last measured by the positioning unit and a communication state including at least identification information of a base station that is wirelessly communicated by the wireless communication unit at the end of positioning by the positioning unit; ,
When the positioning unit restarts positioning, a comparison determination unit that compares the communication status of the current wireless communication by the wireless communication unit and the communication status stored in the storage control unit;
A current position estimation unit that estimates the positioning position stored by the storage control unit as the current position of the mobile terminal when it is determined by the comparison determination unit to match;
Mobile terminal equipped with.