WTRU Positioning Reference Signal Path Reporting
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Solution Overview
Problem
In wireless communication systems, particularly in 5G new radio (NR) and legacy systems like 4G LTE, accurate positioning is hindered by multipath environments where positioning reference signals (PRS) arrive via multiple paths, leading to inaccurate round-trip time (RTT) measurements and positioning errors due to the presence of both line-of-sight (LOS) and non-line-of-sight (NLOS) paths.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives positioning reference signals (PRS) via multiple paths, determines the receive-to-transmit (Rx−Tx) time differences for each path, and reports these differences to the network, allowing the network to associate path IDs with respective sounding reference signal (SRSp) resources and spatial relations. The WTRU then transmits SRSp signals via specific resources associated with these paths, enabling the network to correct for multipath effects and improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the WTRU reports Rx-Tx time differences for all received paths, then positioning accuracy is improved, but the complexity of measurement reporting and processing increases
Solution Approach 1:
The patent segments the measurement reporting by associating each Rx-Tx time difference with a specific path ID and SRSp resource identifier. This segmentation allows the network to process only relevant paths for positioning calculations, reducing overall processing complexity while maintaining accuracy for selected paths.
Solution Approach 2:
The patent applies local quality by enabling the network to select specific paths (with particular spatial relations and SRSp resources) for positioning calculations rather than processing all paths uniformly. This allows focused processing on high-quality paths that contribute most to positioning accuracy.
2Measurement precision
If the network associates path IDs with SRSp resources and spatial relations, then positioning accuracy in multipath environments is improved, but the device and network complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring spatial relations between DL reference signals and UL SRSp resources before positioning measurements are taken. This pre-association of path IDs with SRSp resources and spatial relations simplifies the actual measurement and reporting process, as the framework is already established.
Solution Approach 2:
The patent uses path IDs and SRSp resource identifiers as intermediaries to link received PRS paths with transmitted SRSp signals. These intermediaries enable the network to track and associate specific propagation paths through the round-trip measurement process without requiring complex direct tracking of signal paths.
3Reliability
If the WTRU transmits SRSp signals via multiple resources corresponding to different paths, then RTT measurement reliability is improved, but transmission overhead and latency increase
Solution Approach 1:
The patent employs periodic action by configuring the WTRU to transmit SRSp signals at specific periodic intervals corresponding to different path measurements. This structured periodic transmission allows the network to collect reliable multi-path measurements efficiently, balancing reliability requirements with latency constraints through optimized timing.
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed herein associated with positioning in wireless systems. Features may be implemented, for example, in the behavior of a wireless transmit/receive unit (WTRU) for measurement reporting during a multi-beam channel scan, in WTRU behavior during a measurement report in the presence of a multipath, and/or in WTRU behavior during reporting to acquire correction information from the network. A WTRU may receive a PRS transmission via multiple paths, wherein the paths may be associated with the beams. The WTRU may report Rx−Tx time differences associated with the reception of the PRS transmission via multiple paths and transmission of respective SRSp's associated with the respective paths.