DCI-Based Triggered PRS for 5G Positioning

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G networks, face challenges in efficiently triggering positioning reference signals (PRS) due to high signaling overhead, increased power consumption, and reduced flexibility in existing PRS signaling methods, which hinder efficient positioning and measurement processes.

Innovation Solution

The method involves using downlink control information (DCI) with specific code points to dynamically trigger UE to measure PRS resources, resource sets, frequency layers, or TRPs, allowing for on-demand PRS signaling, reducing system latency and improving flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional PRS signaling methods are used, then positioning measurements can be performed, but signaling overhead increases and flexibility decreases

Engineering Contradiction:

Improveflexibility of PRS signalingVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent implements dynamic PRS triggering through DCI format 2_7, where the network can dynamically activate or deactivate PRS resources based on current positioning requirements. This allows the system to adapt PRS signaling flexibly - activating PRS only when positioning measurements are needed and deactivating them when not required, thereby reducing signaling overhead while maintaining positioning capability when needed

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If PRS measurements are continuously monitored, then positioning accuracy is maintained, but power consumption at UE increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidpower consumption at UE

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic PRS triggering where the network sends DCI format 2_7 messages at specific intervals to activate PRS resources. The UE only performs positioning measurements when triggered by these periodic DCI messages, rather than continuously monitoring PRS. This periodic activation maintains positioning accuracy when needed while significantly reducing power consumption during intervals when PRS is deactivated

Inventive Principle:

Principle #19Periodic action

3Productivity

If on-demand PRS triggering is implemented, then flexibility and efficiency improve, but system latency may increase

Engineering Contradiction:

Improveefficiency of PRS measurementsVSAvoidsystem latency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent configures multiple PRS resource sets in advance through RRC signaling before they are needed for measurements. When the network needs to trigger PRS measurements, it can immediately activate pre-configured resource sets using DCI format 2_7 without needing to set up new resources. This preliminary configuration reduces the latency introduced by on-demand triggering while maintaining the efficiency benefits of flexible activation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230047646A1Downlink control information (DCI)-based triggered positioning reference signals (PRS)

Publication Date: 2023.02.16 QUALCOMM INC

AI summary

Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives, from a serving transmission-reception point (TRP), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, and measures PRS transmitted on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs.