发明名称 |
Automatic activation of speed measurement in mobile device based on available motion |
摘要 |
A system and method for speed measurement of a mobile device (300), using a speed sensor (460) such as a satellite navigation system (460) or an accelerometer, does not need such speed sensor (460) to be continually activated. The system and method make use of a monitor (471) for monitoring at least one motion indicium for indicating that the speed of the mobile device (300) is above an initial threshold (112), including but not limited to: monitoring the Doppler shift measurements of a timing signal; monitoring the timing advance of a cellular radio signal; monitoring the number of base stations (511) visible to the mobile device (300); monitoring the frequency of base station handover, however determined; monitoring the level crossings and/or the autocorrelation of an RSSI signal; and/or triangulation of the position of the mobile device (300). When the monitor (471) determines that the mobile device (300) may be travelling in excess of a threshold speed (112), a speed sensor (460) is activated to confirm the indication. If the speed sensor (460) determines that the mobile device (300) is travelling at a speed below a second threshold (171), the speed sensor (460) is deactivated. |
申请公布号 |
EP2222063(A1) |
申请公布日期 |
2010.08.25 |
申请号 |
EP20090153148 |
申请日期 |
2009.02.18 |
申请人 |
RESEARCH IN MOTION LIMITED |
发明人 |
DIETZ, DAVID BLAINE;SANGARY, NAGULA THARMA;SIMMONS, SEAN BARTHOLOMEW;LAZARIDIS, MIHAL;DOLL, JONATHAN CYRIL SKILTON;JARMUSZEWSKI, PERRY |
分类号 |
H04M1/60 |
主分类号 |
H04M1/60 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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