Title:
無線通信システムからの情報に含まれるタイミングに基づいてGPS時刻を推定する移動体端末及び方法
Document Type and Number:
Japanese Patent JP4685778
Kind Code:
B2
Abstract:
A mobile terminal generates an estimate of GPS time. The mobile terminal includes a cellular receiver, a GPS receiver, and a processor. The cellular receiver is configured to receive communication signals from cells in a wireless communication system. The GPS receiver receives GPS signals and determines a GPS time reference therefrom. The processor estimates a cell time reference from the received communication signals, and generates cell-to-GPS timing data that represents a time offset between the cell time reference and the GPS time reference. The processor then estimates GPS time based on a time indicator portion of a received communication signal and the cell-to-GPS timing data. The estimated GPS time may be used by the GPS receiver to acquire GPS signals.
Inventors:
Camp, william, oh., junior
Gerard, Micharak
Bloebaum, Elle, Scott
Gerard, Micharak
Bloebaum, Elle, Scott
Application Number:
JP2006527964A
Publication Date:
May 18, 2011
Filing Date:
May 20, 2004
Export Citation:
Assignee:
Sony Ericsson Mobile Communications, AB
International Classes:
G01S19/25; G01S1/00; H04W56/00
Domestic Patent References:
| JP2003529084A | ||||
| JP2005086320A |
Foreign References:
| US20020173322 | ||||
| WO2001073467A1 | ||||
| US6433739 | ||||
| WO2002075349A1 |
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura