Delta Configurations for Layer 1/2 Triggered Mobility

Solution Overview

Problem

In wireless communication networks, layer 1/layer 2 triggered mobility (LTM) procedures often result in communication errors and radio link failures due to the need for intermediate radio resource control (RRC) reconfiguration during sequential cell switches, leading to high power and resource consumption.

Innovation Solution

Implementing delta configurations based on a dedicated reference configuration for user equipment (UE) and network nodes, allowing sequential LTM procedures without intermediate RRC reconfiguration by referencing a reference LTM configuration and its delta configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If intermediate RRC reconfiguration is performed during sequential cell switches in LTM procedures, then mobility management is achieved, but communication errors and radio link failures increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidprocedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network node pre-configures multiple candidate cell configurations and delta configurations in advance before the UE performs sequential cell switches. This preliminary configuration eliminates the need for intermediate RRC reconfiguration during mobility procedures, thereby reducing communication errors and radio link failures while maintaining reliable mobility management.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of performing full RRC reconfiguration during each cell switch, the system uses delta configurations that represent differences from a reference configuration. The UE applies these delta configurations to update its current configuration efficiently, avoiding the complexity and errors associated with complete reconfiguration procedures.

Inventive Principle:

Principle #26Copying

2Productivity

If intermediate RRC reconfiguration is performed during sequential cell switches, then cell switching is completed, but power and resource consumption increase

Engineering Contradiction:

Improvecell switching efficiencyVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The network node pre-configures multiple candidate cell configurations and delta configurations in advance before the UE performs sequential cell switches. This preliminary configuration eliminates the need for intermediate RRC reconfiguration during mobility procedures, thereby reducing communication errors and radio link failures while maintaining reliable mobility management.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system transitions from full RRC reconfiguration to applying delta configurations that represent parameter changes from a reference configuration. This reduces the processing overhead and power consumption associated with complete reconfiguration procedures while maintaining the ability to perform sequential cell switches efficiently.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If delta configurations based on reference configuration are used, then intermediate RRC reconfiguration is eliminated, but configuration management complexity increases

Engineering Contradiction:

Improveradio link reliabilityVSAvoidconfiguration management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network node acts as an intermediary by maintaining the reference configuration and generating delta configurations that the UE applies. This centralizes the complexity of configuration management at the network side, simplifying the UE's task to merely applying pre-calculated delta configurations rather than managing complete reconfigurations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of performing full RRC reconfiguration during each cell switch, the system uses delta configurations that represent differences from a reference configuration. The UE applies these delta configurations to update its current configuration efficiently, avoiding the complexity and errors associated with complete reconfiguration procedures.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20240276316A1Delta configuration for layer 1/layer 2 triggered mobility

Publication Date: 2024.08.15 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a reference layer 1/layer 2 triggered mobility (LTM) configuration indicating one or more reference special cell (SpCell) configurations and zero or more reference secondary cell (SCell) configurations. The UE may receive one or more candidate cell group configurations, each of the one or more candidate cell group configurations indicating one or more delta configurations with respect to at least one of the one or more reference SpCell configurations or the zero or more reference SCell configurations. The UE may perform an LTM procedure associated with a selected candidate cell group configuration, of the one or more candidate cell group configurations. Numerous other aspects are described.