Digital Twin RACH Selection Using Verified SSB Measurements

Solution Overview

Problem

Existing wireless communication systems face challenges in verifying synchronization signal block (SSB) measurements efficiently, leading to increased latency due to the need for repeated measurements, which are power-intensive and time-consuming.

Innovation Solution

Utilizing digital twin (DT) models to estimate and verify SSB measurements, allowing UEs to select optimal random access channel (RACH) occasions based on geographic location and confidence levels, thereby reducing the reliance on repetitive SSB measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repeated SSB measurements are performed to verify measurement accuracy, then measurement reliability is improved, but latency and power consumption increase

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network entity performs SSB measurements and generates measurement reports in advance before the UE needs them. The measurement results are stored and made available when the UE requests them, eliminating the need for the UE to perform repeated measurements and reducing latency while maintaining measurement reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network entity acts as an intermediary that performs measurements on behalf of the UE and provides the results. This mediator approach allows the UE to obtain verified measurement accuracy without performing its own repeated measurements, thus reducing both latency and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If repeated SSB measurements are performed to verify measurement accuracy, then measurement reliability is improved, but power consumption increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network entity performs SSB measurements and generates measurement reports in advance before the UE needs them. The measurement results are stored and made available when the UE requests them, eliminating the need for the UE to perform repeated measurements and reducing power consumption while maintaining measurement reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network entity acts as an intermediary that performs measurements on behalf of the UE and provides the results. This mediator approach allows the UE to obtain verified measurement accuracy without performing its own repeated measurements, thus reducing both latency and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If UEs perform own SSB measurements to select RACH occasions, then autonomy is improved, but measurement precision may be insufficient

Engineering Contradiction:

ImproveUE autonomyVSAvoidSSB measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The network entity acts as an intermediary that performs measurements on behalf of the UE and provides the results. This mediator approach allows the UE to obtain verified measurement accuracy without performing its own repeated measurements, thus reducing both latency and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The network entity provides measurement reports with confidence levels to the UE. The UE uses this feedback information to make informed decisions about RACH occasion selection, combining the network's precise measurements with UE autonomy in the decision-making process.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20260020070A1Digital twin assisted random access

Publication Date: 2026.01.15 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select a random access channel (RACH) resource to access a cell based on measurements of synchronization signal blocks (SSBs) transmitted by the cell. A UE may use a digital twin (DT) entity to verify, augment, and/or replace measurements of SSBs for RACH resource selection. A DT entity may estimate the pathloss of given SSBs transmitted by a given cell at given UE locations with respect to the cell. A UE may send a request to the DT entity for one or more estimated measurement values associated with one or more SSBs for a given cell. Based on the geographic location of the UE, the DT entity may send the requested estimated measurement values to the UE. The UE may select a RACH occasion for transmission of a RACH message based on the provided estimated measurement values.