Sounding Reference Signal Phase Coherency After Resource Cancellation

Solution Overview

Problem

Conventional phase coherency techniques for sounding reference signals (SRS) in wireless communications systems are deficient when a portion of allocated resources is canceled, leading to gaps in SRS transmission and loss of phase coherency.

Innovation Solution

A user equipment (UE) determines and maintains phase coherency configurations for non-canceled SRS resources by receiving control messages indicating resource cancellations, allowing for varying degrees of phase coherency, such as maintaining phase coherency within predefined thresholds or using different phases for SRS transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional phase coherency techniques are used for SRS transmissions, then phase coherency is maintained for contiguous resource allocations, but phase coherency is lost when resource cancellation creates gaps in the allocated set

Engineering Contradiction:

Improvephase coherencyVSAvoidhandling of resource cancellation

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the phase coherency configuration adaptive rather than fixed. The UE dynamically determines whether to maintain phase coherency based on the time gap size caused by resource cancellation. When the gap is small, phase coherency is maintained; when the gap is large, phase coherency is relaxed. This dynamic adjustment allows the system to handle resource cancellation scenarios flexibly while preserving phase coherency where possible.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of phase coherency configuration based on the time gap duration. The system transitions between different phase coherency states (maintained vs. relaxed) depending on the temporal parameter of the resource gap. This parameter change enables the system to adapt to varying cancellation scenarios and optimize channel estimation accuracy under different conditions.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If phase coherency is maintained for all SRS transmissions, then channel estimation accuracy is improved, but system flexibility is reduced when resources are canceled

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidphase coherency determination logic

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent simplifies the complexity by using a clear parameter threshold (time gap duration) to determine phase coherency behavior. Instead of complex decision logic, the system uses a straightforward comparison: if the time gap between SRS transmissions is less than a threshold, maintain phase coherency; otherwise, relax it. This parameter-based approach balances measurement precision with implementation simplicity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system incorporates feedback from the resource allocation and cancellation control messages to determine the appropriate phase coherency configuration. The UE receives control information about the allocated and canceled resources, uses this feedback to calculate time gaps, and adjusts phase coherency accordingly. This feedback mechanism enables accurate channel estimation while managing complexity through information-driven decisions.

Inventive Principle:

Principle #23Feedback

3Productivity

If resource cancellation is implemented to optimize system resources, then resource allocation efficiency is improved, but phase coherency is disrupted causing gaps in SRS transmission

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidphase coherency continuity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the phase coherency configuration adaptive rather than fixed. The UE dynamically determines whether to maintain phase coherency based on the time gap size caused by resource cancellation. When the gap is small, phase coherency is maintained; when the gap is large, phase coherency is relaxed. This dynamic adjustment allows the system to handle resource cancellation scenarios flexibly while preserving phase coherency where possible.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of phase coherency configuration based on the time gap duration. The system transitions between different phase coherency states (maintained vs. relaxed) depending on the temporal parameter of the resource gap. This parameter change enables the system to adapt to varying cancellation scenarios and optimize channel estimation accuracy under different conditions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12425163B2Techniques for sounding reference signal phase coherency

Publication Date: 2025.09.23 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to receive, from a base station, an indication of a set of resources for transmitting a set of phase-coherent sounding reference signals (SRSs). The UE may receive, from the base station, a control message indicating a cancellation of an allocation of a first portion of the set of resources. The UE may determine a phase coherency configuration associated with a second portion of the set of resources based on receiving the control message indicating the cancellation. The UE may then be configured to transmit one or more SRSs within the second portion of the set of resources in accordance with the determined phase coherency configuration.