Secondary RLC Entity Activation for PDCP Duplication Latency

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Solution Overview

Problem

Existing communication technologies face challenges in optimizing data transmission latency and reliability, particularly in activating secondary RLC entities for redundant data transmission, which may not meet time requirements due to decoding procedures.

Innovation Solution

A scheme where terminal and network devices independently determine and activate target secondary RLC entities associated with activated or activating serving cells, allowing for efficient retransmission of data without relying solely on MAC CE activation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If MAC CE is used to activate secondary RLC entities, then reliability is improved through redundant transmission, but latency increases due to decoding procedures

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidactivation latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple secondary RLC entities and their associated serving cells before transmission is needed. When retransmission is required, the system can immediately activate a pre-configured secondary RLC entity without waiting for MAC CE decoding, thus reducing latency while maintaining reliability through redundant transmission paths.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the activation process into two parts: configuration phase (where multiple secondary RLC entities are pre-configured) and activation phase (where only the specific entity needed for retransmission is activated). This segmentation allows the system to prepare multiple potential transmission paths in advance while only activating the necessary one when needed, reducing both latency and resource overhead.

Inventive Principle:

Principle #1Segmentation

2Reliability

If all secondary RLC entities are activated for retransmission, then reliability is improved, but device complexity and resource overhead increase

Engineering Contradiction:

Improveretransmission reliabilityVSAvoidactivation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by selectively activating only the specific secondary RLC entity associated with the failed transmission path, rather than activating all secondary entities. This targeted approach maintains reliability by ensuring that a suitable retransmission path is available while reducing device complexity and resource overhead compared to activating all entities.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by activating only the minimum necessary secondary RLC entity (one associated with an available serving cell) for retransmission, rather than activating all configured secondary entities. This partial activation achieves the required reliability while minimizing complexity and resource consumption.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250193826A1A method, device, apparatus and computer-readable medium for communication

Publication Date: 2025.06.12 NOKIA TECHNOLOGIES OY

AI summary

Embodiments of the present disclosure relate to devices, methods, apparatuses and computer-readable storage medium for communication. In some example embodiments, a terminal device receives an indication for a retransmission of a protocol data unit comprising data of a Data Radio Bearer (DRB). The terminal device activates, at the terminal device, a target secondary Radio Link Control (RLC) entity of one or more secondary RLC entities configured for the data of the DRB, the target secondary RLC entity being associated with at least one serving cell that is in an activated mode or in an activation procedure.