Cell Selection Procedure with Measurement Scaling Factor

Solution Overview

Problem

Current wireless communication systems, particularly in the context of 5G and RedCap devices, face challenges in efficient cell selection procedures when configured with eDRX cycles longer than 10.24 seconds, leading to inadequate power saving and flexible configuration options for wireless devices (WDs) during low activity states.

Innovation Solution

The implementation of a cell selection process that accounts for measurement scaling factors, allowing WDs to initiate cell selection procedures based on predetermined time periods and scaling factors, even when eDRX cycles exceed 10.24 seconds, ensuring efficient power management and flexible configurations by adjusting the paging time window and monitoring windows.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If eDRX cycle is extended beyond 10.24 seconds to improve power saving, then power consumption is reduced, but cell selection reliability deteriorates due to insufficient measurement time

Engineering Contradiction:

Improvepower consumptionVSAvoidcell selection reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies dynamics by making the measurement time period adaptive rather than fixed. The network node configures different measurement time periods based on the eDRX cycle length, allowing the system to dynamically adjust the balance between power saving and measurement reliability. When eDRX cycle exceeds 10.24 seconds, the measurement time period is extended proportionally to ensure sufficient measurements can be completed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of measurement time period based on the eDRX cycle configuration. By establishing a proportional relationship between eDRX cycle length and measurement time period, the system adjusts measurement opportunities to match the extended sleep cycles, ensuring that WDs have adequate time to perform necessary cell selection measurements while maintaining power saving benefits.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If measurement time period is extended to ensure sufficient measurements during long eDRX cycles, then cell selection reliability is improved, but power saving capability deteriorates

Engineering Contradiction:

Improvecell selection reliabilityVSAvoidpower saving capability

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the parameter of measurement time period based on the eDRX cycle configuration. By establishing a proportional relationship between eDRX cycle length and measurement time period, the system adjusts measurement opportunities to match the extended sleep cycles, ensuring that WDs have adequate time to perform necessary cell selection measurements while maintaining power saving benefits.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies dynamics by making the measurement time period adaptive rather than fixed. The network node configures different measurement time periods based on the eDRX cycle length, allowing the system to dynamically adjust the balance between power saving and measurement reliability. When eDRX cycle exceeds 10.24 seconds, the measurement time period is extended proportionally to ensure sufficient measurements can be completed.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If fixed measurement requirements are applied regardless of eDRX cycle length, then system complexity is reduced, but adaptability to different activity states deteriorates

Engineering Contradiction:

Improvesystem complexityVSAvoidadaptability to different activity states

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter of measurement time period based on the eDRX cycle configuration. By establishing a proportional relationship between eDRX cycle length and measurement time period, the system adjusts measurement opportunities to match the extended sleep cycles, ensuring that WDs have adequate time to perform necessary cell selection measurements while maintaining power saving benefits.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20240422669A1Cell selection procedure accounting for measurement scaling factor in low activity state

Publication Date: 2024.12.19 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A network node configured to communicate with a wireless device (WD) using at least one cell associated with the network node is described. The WD is configurable to operate in a discontinuous reception mode. The network node includes processing circuitry configured to determine a configuration for the WD to operate in the discontinuous reception mode. The determined configuration is usable by the WD to perform a cell selection procedure for a network if the WD has not found at least one suitable cell based on a second measurement performed within a second time period which is based at least in part on a scaling factor. The second measurement is associated with at least one second cell associated with the network node and is performed if the WD does not meet a cell selection criterion for a first cell. The configuration is transmitted to the WD.