Location estimation

摘要

A current location of a mobile system in a wireless network can be determined by using information provided by a base station in communication with the mobile system. The information can include a system identifier (SID) table and a local time offset (LTM_OFF) value and a daylight savings time (DAYLT) value. The SID table is used to provide a mobile country code (MCC) associated with a country in which the mobile device is located. The LTM_OFF value is used to provide a range of longitude values in which the mobile device is located. The current location of the mobile device is based upon at least the range of longitude values and the current country.

主权项

1. A method, comprising:
acquiring a service by a mobile system by receiving information from a base station of a wireless communication network, wherein the information includes a system identification (SID), a local time offset value (LTM_OFF), and a daylight saving time offset (DAYLT); using the LTM_OFF and a mobile country code (MCC) associated with the SID to determine a range of longitude values and latitude values associated with a current location of the mobile system; querying a table with the current location to determine a geographical region associated with the current location, the table stored on the mobile system, the geographical region being one of a plurality of geographical regions within a carrier network's scope of operation, wherein a boundary of the geographical region is defined at least in part based on a tag identifying a previous location of a device while receiving a signal associated with the geographical region; and using the geographical region to access a scan list to identify one or more frequencies to be scanned for communicating with the wireless communication network, the scan list stored on the mobile system.