Terminal Device DRX Cycles for Dynamic TDD Power Reduction

Solution Overview

Problem

In radio communication systems employing dynamic TDD, existing technologies have not adequately addressed power consumption reduction.

Innovation Solution

A terminal device is designed to perform discontinuous reception by setting multiple UL-DL configurations, monitoring physical downlink control channels, and transmitting HARQ-ACK signals based on specific timing configurations, allowing for efficient power management during active cycles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dynamic TDD is applied to improve throughput by changing uplink-downlink resource ratio, then productivity is improved, but power consumption increases due to continuous monitoring requirements

Engineering Contradiction:

ImprovethroughputVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by implementing discontinuous reception (DRX) cycles where the terminal device alternates between active monitoring periods and sleep periods. The terminal monitors PDCCH only during active time within DRX cycles, turning off reception circuits during non-active periods, thereby reducing power consumption while maintaining throughput performance through periodic resource allocation updates.

Inventive Principle:

Principle #19Periodic action

2Adaptability or versatility

If multiple UL-DL configurations are monitored to support dynamic TDD, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improveflexibility in UL-DL configurationVSAvoidconfiguration management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the monitoring process into distinct segments: first monitoring PDCCH for UL-DL configuration information, then separately determining active time based on DRX cycles, and finally monitoring PDCCH for downlink assignments only during active time. This segmented approach simplifies the management of multiple UL-DL configurations by processing them in discrete, manageable stages rather than continuously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies dynamics by making the monitoring behavior adaptive based on received configurations and DRX cycle states. The terminal dynamically adjusts its monitoring activity - switching between monitoring and sleeping states based on the active time determination, thereby managing multiple UL-DL configurations flexibly without requiring continuous high-power operation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If continuous PDCCH monitoring is performed to ensure reliable communication, then reliability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by implementing discontinuous reception (DRX) cycles where the terminal device alternates between active monitoring periods and sleep periods. The terminal monitors PDCCH only during active time within DRX cycles, turning off reception circuits during non-active periods, thereby reducing power consumption while maintaining throughput performance through periodic resource allocation updates.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS9854599B2Terminal device, integrated circuit, and radio communication method capable of reducing power consumption in radio communication system to which dynamic TDD is applied

Publication Date: 2017.12.26 SHARP KK

AI summary

A terminal device sets a first UL-DL configuration, sets a subframe for monitoring a physical downlink control channel accompanied with information indicating a second UL-DL configuration, monitors the physical control channel accompanied with information indicating the second UL-DL configuration in the set subframe during an active time based on a first subframe set as a downlink subframe or a subframe including a DwPTS based on the first UL-DL configuration, and monitors a physical downlink control channel accompanied with a C-RNTI in a second subframe set as a downlink subframe or a subframe including the DwPTS based on the second UL-DL configuration during the active time.