UE RSRP Comparison for RRC_INACTIVE Small Data Alignment

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Solution Overview

Problem

In RRC_INACTIVE state, there is a need for time alignment validation for small data transmission due to UE mobility and channel quality variation, which is not adequately addressed in existing technologies.

Innovation Solution

A wireless communication method involving RRC message configuration, RSRP measurement, and threshold-based criteria for random access small data transmission (RA-SDT) to ensure accurate time alignment validation, allowing for efficient small data transmission via configured grant (CG-SDT), dynamic grant (DG-SDT), or random access (RA-SDT) when RSRP thresholds are met.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If small data transmission is performed in RRC_INACTIVE state without timing alignment validation, then transmission speed is improved, but reliability deteriorates due to UE mobility and channel quality variation

Engineering Contradiction:

Improvetransmission speedVSAvoidtiming alignment accuracy

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The system performs preliminary timing alignment validation by measuring RSRP values before small data transmission in RRC_INACTIVE state. The UE measures a first RSRP value when receiving RRC message and a second RSRP value when initiating SDT, calculating the difference to determine if timing alignment is still valid. This preliminary check ensures reliable transmission before data is sent.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanism by comparing the difference between first and second RSRP values against a threshold. When the RSRP difference satisfies the threshold criteria, the UE determines that timing alignment is valid and can proceed with configured grant small data transmission. This feedback loop maintains timing alignment accuracy while enabling efficient SDT.

Inventive Principle:

Principle #23Feedback

2Reliability

If timing alignment validation is performed for small data transmission in RRC_INACTIVE state, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvetiming alignment accuracyVSAvoidmeasurement and validation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The UE performs self-service timing alignment validation by autonomously measuring RSRP values, calculating the difference, and determining whether timing alignment is valid based on pre-configured thresholds. The UE uses its own stored first RSRP value and compares it with the newly measured second RSRP value, making the validation process self-contained and reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes the parameter from complex timing alignment calculations to simple RSRP value comparison. By using RSRP difference threshold as the validation criterion, the system simplifies the timing alignment validation process while maintaining reliability, avoiding complex signal processing and timing calculations.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If RSRP difference threshold validation is implemented for SDT, then manufacturing precision is improved, but loss of time increases due to additional measurements

Engineering Contradiction:

Improvetime alignment precisionVSAvoidmeasurement time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system performs partial validation by only measuring RSRP values when SDT is initiated in RRC_INACTIVE state, rather than continuous monitoring. The UE measures the second RSRP value only when needed for SDT decision-making, comparing it with the stored first RSRP value. This partial measurement approach achieves sufficient timing alignment precision without excessive time consumption.

Inventive Principle:

Principle #16Partial or excessive action

4Productivity

If configured grant small data transmission is enabled with timing alignment validation, then productivity is improved, but use of energy increases due to additional validation procedures

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidUE energy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The UE performs preliminary RSRP measurement and stores the first RSRP value when receiving RRC message, so that when SDT is initiated, the validation can be performed quickly by comparing with the pre-stored value. This preliminary action reduces the energy required during actual SDT operations, as the heavy measurement is done in advance when the UE is already active for RRC message reception.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250234313A1User equipment, base station, and wireless communication method

Publication Date: 2025.07.17 ESSEN INNOVATION CO LTD

AI summary

A wireless communication method for execution by a user equipment (UE) is provided. The UE receives a radio resource control (RRC) message with a small data transmission (SDT) configuration for the UE. The UE measures and stores a first reference signal received power (RSRP) upon receiving the RRC message and measures a second RSRP upon initiating SDT. The UE transmits uplink small data via random access small data transmission (RA-SDT) when a first portion of criteria associated with an SDT threshold for RA-SDT is satisfied, while an RSRP difference between the first RSRP and the second RSRP does not satisfy a second portion of the criteria associated with SDT threshold.