Method and apparatus for continuity of positioning determination at handover

摘要

Methods and devices are provided for observed time difference of arrival (OTDOA) continuity at handover. In one embodiment, the method may involve, in response to being served by a first serving cell, receiving a first set of timing offsets provided in assistance data from the network. The method may involve, in response to being handed over to a second serving cell, deriving a second set of timing offsets from the first set of timing offsets. The method may involve adjusting measured time difference of arrival (TDOA) values of detected first signals according to the first set of timing offsets, and/or adjusting measured TDOA values of detected second signals according to the second set of timing offsets.

主权项

1. A method operable by a mobile entity (ME) in a wireless network, comprising:
during a period when the ME is being served by a first serving cell, receiving a plurality of timing offsets provided in positioning assistance data from the network, a first timing offset from the plurality timing offsets being relative to a reference cell; determining a first time difference of arrival (TDOA) of a signal from a first neighbor cell at the ME; in response to the ME being handed over to a second serving cell:
calculating, at the ME, an adjusted timing offset based at least in part on a difference between a second timing offset and the first timing offset, the second timing offset being relative to the second serving cell;calculating a second TDOA based at least in part on a difference between an observed time of arrival of a signal from a second neighbor cell and the first timing offset, the second neighbor cell being different from the second serving cell;calculating an adjusted TDOA based at least in part on a difference between the second TDOA and the adjusted timing offset; andcalculating a position of the ME based at least in part on the adjusted TDOA.