Enhanced Sidelink Positioning with Improved Accuracy Under UE Mobility

Abstract

Higher accuracy positioning for moving user equipment (UE) is achieved using knowledge that a particular derivative of the UE position is constant over a time interval to construct an overdetermined system of equations for the UE position; the position derivative may be acceleration (112), velocity (110) or jerk. The UE (102) measures position reference signals (PRS) (106A-C) from a plurality of anchor nodes (104A-C) at a sequence of times in a time interval. It may report the measurements to a location management function (LMF), or server UE functionality may be implemented in e.g. an on-board UE of a vehicle or a target UE. The UE (102) also provides an indication that the D-th derivative of the UE position is constant (or can be approximated as being constant) over the time interval. The LMF can thereby construct an overdetermined set of equations for the UE position at a target time in the time interval (a target UE position). These can be solved to determine a UE position at the target time, from which the UE positions at other times in the time interval can also be determined. The degree of overdetermination of the overdetermined system of equations can also be used to adapt the amount of network resources assigned to positioning the UE (102).

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