FR2 SCell Handshake Mechanism for Faster L1-RSRP Activation

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Solution Overview

Problem

Existing FR2 SCell activation in wireless communication systems experiences excessively long delays due to inefficient L1-RSRP measurement/BM processes, leading to wasted resources and suboptimal network performance.

Innovation Solution

Implementing a handshake mechanism that allows the UE to send a ready indication to the network upon completion of cell synchronization and measurement, enabling flexible configuration and transmission of L1-RSRP measurement/BM reference signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If traditional FR2 SCell activation process is used, then L1-RSRP measurement/BM can be performed, but activation delay is excessively long

Engineering Contradiction:

ImproveSCell activation delayVSAvoidactivation speed

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The UE performs cell synchronization and measurement procedures in advance before the network triggers L1-RSRP measurement. The UE sends a ready indication to the network when these preliminary tasks are complete, allowing the network to configure and transmit L1-RSRP measurement/BM reference signals immediately without waiting for the UE to finish initial synchronization. This preliminary action eliminates idle waiting time and reduces overall activation delay.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If L1-RSRP measurement/BM reference signals are transmitted continuously, then measurement can be performed, but resources are wasted

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidresource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The UE sends a ready indication feedback to the network when it completes cell synchronization and measurement. The network uses this feedback to determine whether to transmit L1-RSRP measurement/BM reference signals. This feedback mechanism ensures reference signals are transmitted only when the UE is actually ready to measure, maintaining measurement reliability while avoiding continuous transmission that would waste network resources and energy.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The UE autonomously determines when it is ready to perform L1-RSRP measurement by completing its own cell synchronization and measurement procedures. The UE then notifies the network of its readiness status, allowing the system to operate efficiently without continuous network control. This self-service approach optimizes resource usage by aligning reference signal transmission with actual UE measurement capability.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260019177A1Handshake mechanism design in fr2 scell activation

Publication Date: 2026.01.15 APPLE INC

AI summary

Handshake mechanism design in Frequency Range 2 (FR2) SCell activation is disclosed. A user equipment (UE) may be configured to send, to a network, a ready indication that the UE is ready to perform Layer 1-Reference Signal Receiving Power (L1-RSRP)/beam (BM) measurement and receive a L1-RSRP measurement/BM Reference Signal (RS) from the network.