SCell Activation Control for DRX Power Saving

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In conventional wireless communication systems, especially in carrier aggregation based on LTE Rel-10, the power saving mode in Secondary Cells (SCells) is often set in conjunction with Primary Cells (PCells, leading to unnecessary power consumption when PCells are in power saving mode, even if SCells do not perform SPS communication, and minimum signal processing is required to comply with specifications during DRX, causing SCells to monitor PDCCH and PDSCH unnecessarily.

Innovation Solution

The mobile station autonomously controls the Activation/Deactivation of SCells based on SPS communication timing, activating SCells only when data transmission is detected and deactivating them after data transmission is completed, reducing unnecessary monitoring of PDCCH and PDSCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If DRX is performed in SCell in conjunction with DRX cycle configuration in PCell, then power saving mode interval is synchronized, but mobile station is caused to monitor PDCCH unnecessarily when PCell is in power saving mode, wasting electric power

Engineering Contradiction:

ImproveDRX cycle synchronizationVSAvoidelectric power consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent segments the DRX control for each component carrier independently. The mobile station performs DRX processing separately for PCell and SCell, allowing each carrier to have its own DRX cycle configuration tailored to its traffic pattern, rather than forcing synchronization that causes unnecessary PDCCH monitoring.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent enables dynamic adjustment of DRX parameters for each component carrier based on real-time traffic conditions. The mobile station can adaptively change DRX cycle lengths, on-duration, and other parameters for PCell and SCell independently, optimizing power consumption according to actual data transmission needs.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If DRX is individually controlled for each component carrier, then traffic pattern specific optimization is achieved, but minimum signal processing is still required to comply with specifications, causing SCell to monitor PDCCH and PDSCH unnecessarily

Engineering Contradiction:

Improvetraffic pattern adaptationVSAvoidsignal processing power

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts and removes unnecessary PDCCH and PDSCH monitoring requirements during DRX off-periods. By reinterpreting specification requirements, the mobile station can skip minimum signal processing that doesn't contribute to actual data transmission, reducing power consumption while maintaining compliance with essential communication functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The mobile station autonomously determines when to activate or deactivate SCell based on detected transmission timing of communication data. The system self-manages the activation state without requiring continuous PDCCH monitoring, allowing the mobile station to enter deeper power saving modes while still meeting communication requirements.

Inventive Principle:

Principle #25Self-service

3Reliability

If SCell is activated continuously to ensure communication readiness, then communication reliability is improved, but power consumption increases due to continuous monitoring of PDCCH and PDSCH

Engineering Contradiction:

Improvecommunication readinessVSAvoidmonitoring power

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The mobile station detects transmission timing of communication data in advance and activates SCell only when needed. By anticipating data transmission events and preparing the SCell accordingly, the system maintains communication readiness without requiring continuous monitoring, activating the carrier just before data transmission occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent dynamically changes the activation state parameter of SCell based on detected transmission timing. Instead of maintaining a fixed active state, the system transitions SCell between active and inactive states according to actual data transmission requirements, optimizing the balance between reliability and power consumption.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9462546B2Mobile station, base station, wireless communication system, and wireless communication method

Publication Date: 2016.10.04 FCNT LLC

AI summary

A mobile station that performs wireless communication by using a plurality of wireless carriers, the mobile station includes a transmission managing unit that detects a transmission timing of communication data of a predetermined wireless carrier, and a state managing unit that makes the predetermined wireless carrier an activated state when the transmission managing unit detects the transmission timing of the communication data, and makes the predetermined wireless carrier a deactivated state after the communication data is transmitted and received.