LOS Link Identification for Wireless Positioning Under NLOS
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately distinguishing between line-of-sight (LOS) and non-line-of-sight (NLOS) communication links, which affects the accuracy of localization and positioning of wireless communication devices.
Innovation Solution
The system addresses this by having wireless communication devices report timing information and reference signal receive power (RSRP) measurements to assist in determining LOS transmission links. This includes reporting differential RSRP values and coherence bandwidth information to differentiate between LOS and NLOS links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless communication devices use traditional positioning methods without additional measurements, then the positioning system is simple, but the positioning accuracy is degraded due to inability to distinguish LOS and NLOS links
Solution Approach 1:
The patent performs preliminary channel measurements including RSRP, timing information, and coherence bandwidth assessments before positioning determination. These pre-measurements are used to classify transmission links as LOS or NLOS, enabling more accurate positioning calculations by selecting appropriate link types.
Solution Approach 2:
The patent introduces coherence bandwidth as an intermediary parameter to distinguish between LOS and NLOS transmission links. By measuring coherence bandwidth alongside RSRP and timing information, the system can identify link characteristics and select appropriate links for positioning, thereby improving accuracy without directly modifying the positioning algorithm.
2Reliability
If wireless communication devices report only RSRP values, then the reporting is simple, but the ability to distinguish LOS and NLOS links is insufficient
Solution Approach 1:
The patent segments the channel characteristics measurement into multiple independent components: RSRP for signal strength, timing information for propagation delay, and coherence bandwidth for multipath resolution capability. Each segment provides specific information about the transmission link, and their combination enables reliable LOS/NLOS classification.
Solution Approach 2:
The patent adds coherence bandwidth measurement as an additional dimension to the traditional RSRP-only reporting. This new measurement dimension provides information about the frequency selectivity of the channel, which is characteristic of LOS versus NLOS links, thereby enhancing the ability to distinguish link types without losing other important channel characteristics.
3Measurement precision
If the system uses multiple measurement parameters for link classification, then the link identification accuracy is improved, but the processing complexity increases
Solution Approach 1:
The patent changes the measurement parameters from traditional single-parameter RSRP reporting to multi-parameter reporting including RSRP, timing information, and coherence bandwidth. These parameter changes enable the system to capture different aspects of the channel characteristics, improving link classification accuracy while the parameters themselves are standard 5G NR measurements that can be obtained through existing measurement mechanisms.
Data Source
AI summary
System, methods and apparatuses for enhancing localization of wireless communication devices can include a wireless communication node transmitting, and a wireless communication device receiving, a plurality of reference signals (RSs), for measurement. Each RS can be communicated along a respective transmission link. The wireless communication device can transmit, and the wireless communication node can receive, at least one of assistance information or a report on reference signal receive powers (RSRPs) of a subset of the plurality of RSs, to assist determination of a line-of-sight (LOS) transmission link among the respective transmission links.