PDCP Reordering Timer Configuration for Latency Management

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing latency for data traffic, particularly in scenarios where packet data convergence protocol (PDCP) communications experience out-of-order packet delivery, leading to excessive latency and potential packet loss.

Innovation Solution

A method and apparatus for a user equipment (UE) to receive information about a recovery time associated with PDCP communication using a reordering timer, and to adjust communication configurations based on a correlation between the packet recovery time and link characteristics, such as block error rate or data rate, to optimize packet delivery and reduce latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a reordering timer is used to manage PDCP packet delivery, then packet recovery capability is improved, but latency increases due to waiting for out-of-order packets

Engineering Contradiction:

Improvepacket recovery capabilityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the reordering timer configurable and adaptable rather than fixed. The timer value can be adjusted based on network conditions, packet types, and recovery patterns, allowing the system to optimize between packet recovery capability and latency reduction dynamically during operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of reordering timer duration based on observed recovery characteristics. By monitoring which packets are recovered and when, the system adjusts the timer parameter to match actual recovery patterns, reducing unnecessary waiting time while maintaining effective packet recovery.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If packets are buffered to enable reordering, then packet recovery is improved, but packet loss increases due to buffer expiration

Engineering Contradiction:

Improvepacket recoveryVSAvoidpacket loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies preliminary action by proactively managing buffer resources and timer configurations before packet loss occurs. The system pre-configures reordering timer values and buffer management strategies based on predicted recovery patterns, preventing buffer expiration and packet loss before they happen.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the system monitors actual packet recovery patterns and uses this information to adjust buffer management policies. This feedback loop allows the system to optimize buffer usage and timer values to prevent packet loss while maintaining recovery effectiveness.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250193733A1Latency management for data traffic

Publication Date: 2025.06.12 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive information identifying a recovery time associated with packet data convergence protocol (PDCP) communication using a reordering timer, wherein a distribution of recovered PDCP counts associated with the PDCP communication is associated with a configured characteristic for a packet recovery time. The UE may communicate on a link using a communication configuration associated with a correlation between the packet recovery time and a link characteristic. Numerous other aspects are described.