GNSS Acquisition Triggering via HARQ Feedback

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing GNSS measurement gaps, particularly in coordinating the start time of these gaps and conserving power resources, due to timing misalignments between network nodes and user equipment (UE), and handling failures in GNSS acquisition within these gaps.

Innovation Solution

The method involves receiving a trigger for GNSS acquisition within a measurement gap, with the start time based on HARQ feedback, and selectively performing the acquisition based on the remaining GNSS validity duration, including failure recovery processes to conserve power and extend NTN connection duration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the GNSS measurement gap start time is coordinated based on HARQ feedback, then the timing alignment between network nodes and UE is improved, but the complexity of coordinating multiple timing parameters increases

Engineering Contradiction:

Improvetiming alignmentVSAvoidcoordination complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies feedback by using HARQ (Hybrid Automatic Repeat Request) feedback to determine the start time of the GNSS measurement gap. The network node waits for HARQ feedback from the UE before initiating the measurement gap, ensuring proper timing alignment. This feedback mechanism resolves the timing coordination issue while managing complexity through a standardized protocol approach.

Inventive Principle:

Principle #23Feedback

2Loss of time

If the UE performs GNSS acquisition within the measurement gap, then the GNSS reacquisition is completed timely, but the power consumption increases

Engineering Contradiction:

ImproveGNSS reacquisition timeVSAvoidpower consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by having the UE perform GNSS acquisition during the measurement gap before the GNSS validity duration expires. The network node triggers the measurement gap in advance, allowing the UE to complete reacquisition within the allocated time window. This prevents last-minute acquisitions that would consume more power and time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by making the measurement gap duration and timing adaptive based on the remaining GNSS validity duration and HARQ feedback conditions. The system dynamically adjusts when the measurement gap starts and how long it lasts to optimize both timing and power consumption based on actual network and device state.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the measurement gap duration is extended to ensure complete GNSS acquisition, then the acquisition success rate is improved, but the connection duration is reduced

Engineering Contradiction:

Improveacquisition success rateVSAvoidconnection duration

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies parameter changes by adjusting the measurement gap timing parameters (start time, duration) based on the remaining GNSS validity duration and HARQ feedback conditions. Rather than using a fixed extended gap, the system dynamically modifies parameters to achieve reliable acquisition within the constraints of connection duration.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If the UE continuously monitors GNSS validity duration, then the failure recovery is timely, but the processing overhead increases

Engineering Contradiction:

Improvefailure recovery timelinessVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies feedback by having the UE report the remaining GNSS validity duration to the network node, which then uses this information to trigger the measurement gap appropriately. This feedback mechanism ensures timely failure recovery while avoiding continuous monitoring overhead by using periodic or event-driven updates.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20240337758A1Global navigation satellite system operation with triggered gaps

Publication Date: 2024.10.10 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a trigger indicating that the UE is to perform a global navigation satellite system (GNSS) acquisition process within a GNSS measurement gap, wherein a start time of the GNSS measurement gap is based at least in part on whether hybrid automatic repeat request (HARQ) feedback is enabled for a channel in which the trigger is received. The UE may perform the GNSS acquisition process within the GNSS measurement gap based at least in part on the trigger. Numerous other aspects are described.