RLC and PDCP Re-establishment for Seamless Cell Change

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently performing cell change procedures, particularly in re-establishing Radio Link Control (RLC) and Packet Data Convergence Protocol (PDCP) entities during cell changes.

Innovation Solution

A method and device for user equipment (UE) in wireless communication systems, where the UE receives configuration information for a radio bearer and performs a cell change procedure by re-establishing the RLC and PDCP entities indicated in the configuration information, without changing the security key for the PDCP entity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If cell change procedure is performed in existing wireless communication systems, then mobility management is enabled, but packet loss occurs and system performance deteriorates

Engineering Contradiction:

Improvemobility managementVSAvoidpacket loss

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by re-establishing the RLC entity before performing the cell change procedure. The RLC entity is re-established in advance to ensure proper data transmission setup, which prevents packet loss during the cell change process and improves overall system reliability while maintaining mobility management functionality.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If RLC and PDCP entities are re-established during cell change, then data transmission reliability is improved, but procedure complexity increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidprocedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the cell change procedure into distinct phases: first re-establishing the RLC entity, then performing the cell change procedure, and finally re-establishing the PDCP entity. This segmented approach manages complexity by handling entity re-establishment in manageable steps rather than all at once, while ensuring data transmission reliability through proper sequencing.

Inventive Principle:

Principle #1Segmentation

3Reliability

If security key is changed for PDCP entity during cell change, then security is enhanced, but data transmission continuity is disrupted

Engineering Contradiction:

ImprovesecurityVSAvoiddata transmission continuity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by re-establishing the RLC entity before the cell change procedure and maintaining the PDCP entity without re-establishment. This preliminary setup allows the system to prepare data transmission pathways in advance, enabling security enhancements through proper entity management while maintaining data transmission continuity by avoiding unnecessary PDCP re-establishment.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12219411B2Method for performing a cell change procedure in a wireless communication system and a device therefor

Publication Date: 2025.02.04 LG ELECTRONICS INC

AI summary

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing a cell change procedure in the wireless communication system, the method comprising: receiving configuration information indicating an identifier of a radio bearer to which a cell change procedure be performed; and performing the cell change procedure in RLC (Radio Link Control) and PDCP (Packet Data Convergence Protocol) entities of the radio bearer indicated in the configuration information, wherein the cell change procedure comprises a re-establishment of the RLC and PDCP entities.