TRP Dormancy Indication Outside C-DRX Active Time

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Solution Overview

Problem

Current communication systems face challenges in efficiently managing dormancy indications outside of discontinuous reception (DRX) active times, leading to potential power consumption issues and reduced network efficiency.

Innovation Solution

A method and apparatus for a UE and a base station to exchange a wake-up signal (WUS) outside of DRX duration, which includes indications for transmission configuration indicator (TCI) states or control resource set (CORESET) indices, allowing the UE to monitor PDCCHs during DRX active times using active parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE monitors PDCCH continuously outside DRX active time to receive dormancy indications, then the reliability of receiving control information is improved, but the power consumption increases

Engineering Contradiction:

Improvereliability of receiving control informationVSAvoidpower consumption at UE

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The UE operates in discontinuous reception (DRX) cycles, alternating between active time when PDCCH monitoring is performed and sleep time when monitoring is suspended. This periodic action allows the UE to balance between receiving control information reliably and conserving power by not monitoring continuously.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The network configures the UE with dormancy indications and WUS parameters in advance before the DRX active time begins. This preliminary configuration allows the UE to prepare for upcoming active periods without needing to monitor continuously, reducing power consumption while ensuring readiness to receive control information.

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If the UE monitors PDCCH during extended DRX active time to ensure reception of all control information, then the completeness of control information reception is improved, but the power consumption increases

Engineering Contradiction:

Improvecompleteness of control information receptionVSAvoidpower consumption at UE

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The network uses wake-up signals (WUS) to provide feedback to the UE about upcoming DRX active times and dormancy states. This feedback mechanism allows the UE to adjust its monitoring behavior dynamically, ensuring it receives necessary control information during configured active periods without extending monitoring unnecessarily, thus balancing information completeness with power savings.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If the base station transmits dormancy indications frequently to ensure UE receives updated parameters, then the accuracy of parameter information is improved, but the network power consumption increases

Engineering Contradiction:

Improveaccuracy of parameter informationVSAvoidpower consumption at base station

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The base station transmits dormancy indications and WUS periodically according to configured schedules rather than continuously. This periodic transmission ensures the UE receives updated parameters at appropriate intervals to maintain accuracy while significantly reducing the base station's power consumption compared to frequent or continuous transmissions.

Inventive Principle:

Principle #19Periodic action

4Reliability

If the UE monitors all cells in a group during DRX active time, then the reliability of receiving control information from any cell is improved, but the processing complexity increases

Engineering Contradiction:

Improvereliability of receiving control informationVSAvoidprocessing complexity at UE

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network configures the UE with a group of cells and associates specific TCI states with cell groups rather than requiring monitoring of all cells individually. This segmentation allows the UE to focus monitoring efforts on relevant cell groups during DRX active times, maintaining reliability for configured cells while reducing processing complexity by avoiding unnecessary monitoring of all cells.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12302251B2TRP dormancy indication outside C-DRX active time in MTRP

Publication Date: 2025.05.13 QUALCOMM INC

AI summary

Method and apparatus for a dormancy indication outside of a discontinuous reception (DRX) active time. The apparatus receives a wake up signal (WUS) outside of a DRX on duration. The WUS comprises an indication indicating one or more parameters associated with a cell within a group of cells to be active during a DRX active time that corresponds to the WUS. The one or more parameters comprising at least one of a transmission configuration indicator (TCI) state or a control resource set (CORESET) index. The apparatus monitors for at least one physical downlink control channel (PDCCH) from at least one active cell during the DRX active time using active parameters according to the WUS.