Patent ID: 8447327
Filing Date: 2013-05-21
Classification: G01S,H04W

Abstract:
1. A method, comprising receiving by a user equipment a plurality of reference signals from a plurality of nearby cells over a positioning time window comprising a plurality of positioning occasions; grouping the received reference signals into a set of reference signal groups based on a buffering margin and a time difference between a minimum expected reference signal time difference and a maximum expected reference signal time difference of the received signals, wherein grouping the received reference signals further comprises grouping the received reference signals into N groups, wherein each ith group of the N groups includes those reference signals each with the expected reference signal time difference falling between A+(i−1)* buffering margin and (A+i)* buffering margin wherein A is the minimum expected reference signal time difference of the received reference signals; buffering, during at least one of the plurality of positioning occasions, a subset of the set of reference signal groups of the received reference signals in a reference signal buffer whose size is based at least in part on the buffering margin, wherein the size of the reference signal buffer determined by the buffering margin is effective to implement a predetermined positioning accuracy of an observed time difference of arrival report, the subset comprising reference signals received at different times relative to each other and having an expected reference signal time difference between said different times; and generating the observed time difference of arrival report based on the buffered subset of the set of reference signal groups of the received reference signals.