UE Positioning via Beam-Specific PRS Request
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively positioning user equipment (UE) due to limitations in determining accurate positioning reference signals and reference timing, particularly in environments with multiple transmission points and varying signal quality.
Innovation Solution
A method and apparatus that enhance UE positioning by receiving and processing synchronization signal blocks (SSBs) and channel state information-reference signals (CSI-RSs) from multiple beams, determining the best beam based on measurement quality, and requesting positioning reference signals (PRS) from the same direction, which allows for improved PRS resource configuration and reference timing calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If positioning reference signals are transmitted from multiple transmission points using multiple beams, then positioning coverage is improved, but determining accurate reference timing and selecting the best PRS resource becomes more difficult
Solution Approach 1:
The UE performs measurements on SSBs and CSI-RSs from multiple beams before PRS transmission, identifies the best beam based on measurement quality, and requests PRS specifically from that beam's direction. This preliminary beam selection action simplifies the subsequent PRS processing and timing determination, resolving the contradiction by pre-establishing the optimal signal path before the actual positioning measurement.
2Reliability
If positioning reference signals are transmitted using all available beams, then positioning reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
Instead of processing PRS from all beams, the UE extracts and selects only the PRS resource corresponding to the best beam identified from preliminary SSB/CSI-RS measurements. This extraction of the most relevant signal component maintains positioning reliability while significantly reducing processing complexity by eliminating unnecessary processing of inferior beam signals.
3Measurement precision
If the system configures PRS resources for all beams, then positioning accuracy is improved, but loss of information increases due to incorrect PRS resource association
Solution Approach 1:
The UE provides feedback information to the network indicating the best beam identification based on SSB/CSI-RS measurements. The network uses this feedback to correctly associate and transmit PRS resources from the identified best beam. This feedback mechanism ensures accurate PRS resource association, preventing information loss and maintaining positioning accuracy.
Data Source
AI summary
According to at least one embodiment, a UE may perform measurements based on a plurality of synchronization signal blocks (SSBs), transmit first request information related to positioning reference signal (PRS) transmissions based on the measurements, receive a positioning related configuration, and receive at least one PRS based on the positioning related configuration, wherein the first request information includes information regarding a first SSB, and the positioning related configuration includes information related to a reference PRS resource for a reference timing for a reference signal time difference (RSTD), and the reference PRS resource is a PRS resource related to a same downlink beam as that for the first SSB.