Location updating method and apparatus for a cellular subscriber unit comprising a communication receiver and a GPS receiver,申请号EP20040106655-传众专利搜索

Location updating method and apparatus for a cellular subscriber unit comprising a communication receiver and a GPS receiver

申请公布号：EP1548456(B1)

申请号：EP20040106655

申请日期：2004.12.16

申请公布日期：2007.02.07

申请人：

MOTOROLA, INC.

发明人：SHEMESH, YARON;BERCOVICI, MICHAEL;EDRY, ISAAC;KAHLON, HAIM

分类号：G01S5/14;G01S19/24;G01S19/34;G01S19/48

主分类号：G01S5/14

摘要：A subscriber unit (103) for a cellular communication system (100) comprises a first location processor (117) which determines a location estimate from signals transmitted from satellites (105) and from satellite information related to the satellites (105). The satellites (105) may be Global Positioning System (GPS) satellites. The subscriber unit (103) also comprises a receiver (115) which receives the satellite information, and further comprises a second location processor (111) which determines location estimates based on uplink or downlink transmissions in the cellular communication system (100). An update controller (121) determines an update time for the satellite information in response to the location estimates of the second location processor (111). Accordingly, the update operation may be optimised for the specific movement of the subscriber unit (103) without requiring satellite based location estimates. This may improve time to first fix and may reduce power consumption. <IMAGE>