PTRS Configuration for High Doppler Paging

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Solution Overview

Problem

Current wireless communication technologies face challenges in phase noise correction and channel estimation due to high Doppler shifts, particularly in non-stationary satellite-based networks, which affect the reliability and latency of paging communications.

Innovation Solution

Implementing a high Doppler configuration for user equipment (UE) paging, where base stations transmit phase tracking reference signals (PTRS) configured to mitigate the effects of large Doppler shifts, allowing UEs to transition from idle to active states and improve demodulation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional paging methods are used in high Doppler scenarios, then device complexity is reduced, but demodulation performance deteriorates due to phase noise and channel estimation errors

Engineering Contradiction:

Improvedemodulation performanceVSAvoidconfiguration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by introducing a high Doppler configuration that modifies paging communication parameters. Specifically, it configures phase tracking reference signals (PTRS) and channel estimation reference signals (CRS/DMRS) with parameters optimized for high Doppler scenarios, such as increased PTRS density and adjusted frequency offsets, to compensate for phase noise and improve demodulation performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements preliminary action by pre-configuring high Doppler parameters before paging communication occurs. The network determines and signals high Doppler configuration parameters (including PTRS configuration, frequency offset compensation values, and channel estimation parameters) in advance through system information or RRC signaling, enabling the UE to prepare appropriate reception settings before actual paging transmission

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If phase tracking reference signals are configured for high Doppler scenarios, then channel estimation accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies partial action by selectively configuring PTRS only in high Doppler scenarios rather than universally. The network determines whether high Doppler configuration is needed based on UE mobility status and Doppler conditions, and only then activates the enhanced PTRS configuration, avoiding unnecessary signaling overhead in normal scenarios while maintaining accurate channel estimation when needed

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent optimizes PTRS parameters to balance accuracy and overhead. It configures PTRS with appropriate density, frequency offset, and time-domain positioning tailored to the specific Doppler conditions, ensuring sufficient channel estimation accuracy without excessive reference signal overhead

Inventive Principle:

Principle #35Parameter changes

3Reliability

If high Doppler configuration is implemented, then paging communication reliability is improved, but processing time increases

Engineering Contradiction:

Improvepaging communication reliabilityVSAvoidconfiguration processing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent reduces processing time by performing high Doppler configuration in advance. The network determines and signals configuration parameters (PTRS configuration, frequency offsets, channel estimation parameters) before actual paging transmission through system information blocks or RRC signaling, allowing the UE to prepare reception settings beforehand and eliminate configuration delays during critical paging moments

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables the UE to autonomously apply high Doppler configuration based on received indicators. Once the network signals that high Doppler configuration is activated, the UE automatically configures its receiver parameters without requiring detailed step-by-step instructions, reducing processing overhead while ensuring reliable paging reception

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enhances demodulation performance, reduces latency, and improves network reliability by compensating for phase noise and facilitating accurate channel estimation in high Doppler scenarios.

Implementation Method 1

phase tracking for user equipment (UE) paging... high Doppler configuration for UE paging... mitigate the effects of large Doppler shifts

Methodology Applied

Scientific EffectDoppler effect: Doppler Effect

Data Source

PatentUS12041580B2Phase tracking for user equipment paging

Publication Date: 2024.07.16 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication that a high Doppler configuration for UE paging is activated. The UE may detect, based at least in part on receiving the indication that the high Doppler configuration is activated, a phase tracking reference signal (PTRS) for a paging communication. Numerous other aspects are provided.