MIMO Layer-Aware DL PRS Reception for 5G Positioning
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Solution Overview
Problem
The existing 5G mobile standard, specifically in the context of DL PRS design for NR Positioning, does not consider MIMO layer adaptation, which affects the efficiency and accuracy of wireless communication systems.
Innovation Solution
A user equipment (UE) is configured to receive a maximum downlink MIMO layer configuration for DL communications and positioning reference signals (PRS) using a number of reception antennas equal to the maximum number of DL MIMO layers in the active bandwidth part, and transmit uplink PRS using the maximum number of transmission antennas configured for communications purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE uses a number of reception antennas equal to the maximum number of DL MIMO layers for PRS reception, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of reception antennas based on the maximum DL MIMO layer configuration. The UE is configured to use a specific number of antennas corresponding to the maximum MIMO layers, allowing optimization of positioning accuracy for each operational mode while managing hardware complexity through configuration-based adaptation rather than fixed over-provisioning.
2Productivity
If the UE transmits UL PRS using the maximum number of transmission antennas, then spectral efficiency is improved, but latency increases
Solution Approach 1:
The patent implements dynamics by making the antenna configuration adaptive rather than static. The UE determines the number of transmission antennas based on the configured maximum MIMO layers for the active BWP, allowing the system to dynamically optimize spectral efficiency according to current operational conditions while avoiding fixed high-latency configurations.
3Productivity
If the system configures maximum DL MIMO layers for communications, then spectral efficiency is improved, but positioning reference signal reception accuracy deteriorates
Solution Approach 1:
The patent applies universality by ensuring that the maximum DL MIMO layer configuration serves multiple functions: it determines both the communication spectral efficiency and the PRS reception antenna count. This multi-functional configuration allows the same parameter to optimize both data transmission performance and positioning accuracy without requiring separate independent configurations.
Data Source
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AI summary
A user equipment (UE) receives a maximum downlink (DL) Multiple-Input Multiple-Output (MIMO) layer configuration for DL communications, such as control signals or data signals, in one or more bandwidth parts (BWPs) and a positioning reference signal (PRS) configuration for receiving DL PRS. The UE receives DL PRS in an active BWP using a number of reception antennas based on, e.g., at least equal to, the maximum number of DL MIMO layers in the active bandwidth part. The UE may be configured to transmit uplink (UL) PRS, e.g., SRS for positioning purposes, using at least a maximum number of transmission antennas that is configured for communications purposes.