METHOD AND RELATED MOBILE DEVICE FOR REFERENCE SIGNAL TIME DIFFERENCE BASED LOCALIZATION

摘要

The method according to the present disclosure introduces acquisition and tracking modes for a mobile device assisted multilateration based localization method. The method is employed for determining a relative time difference between a positioning reference cell and at least two other detectable positioning cells. The method includes in a mobile device attempting to detect a reference signal of a positioning cell to determine the timing of a detectable positioning cell by either applying sliding window approach to acquire the positioning cell or a single window approach to track the positioning cell. The sliding window approach within a search window is applied to acquire the positioning cell when a coarse timing of the positioning cell has not yet been achieved. A coarse timing is said to be achieved when only a fine timing is further required. This is the case when the remaining search window has a size that is not larger than the capture range capability of the mobile device. Conversely, a single window approach is applied to track the positioning cell when a coarse timing of the positioning cell has been achieved or when the search window is not larger than a capture range capability of the mobile device. Ultimately, the method includes computing the time difference between the positioning reference cell and the at least two other detectable positioning cells.

主权项

1. A method for determining a relative time difference between a positioning reference cell and another detectable positioning cell, the method performed in a mobile device attempting to detect a reference signal of a positioning cell to determine a timing of a detectable positioning cell, the method comprising:
applying a sliding window approach within a search window to acquire the positioning cell when a coarse timing of the positioning cell is not available; applying a single window approach to track the positioning cell when a coarse timing of the positioning cell is available or when the search window is not larger than a capture range capability of the mobile device; and computing the time difference between a timing of the positioning reference cell and a timing of the other detectable positioning.