PDU Set Discard Control for XR Decoding Failure Prevention

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Solution Overview

Problem

In communication networks supporting extended reality (XR) services, decoding failures occur when at least one protocol data unit (PDU) in a group of pictures (GOP) is lost, leading to waste of radio resources due to the inability to decode remaining frames.

Innovation Solution

A method and apparatus for processing PDUs that involve receiving PDUs from a user plane function (UPF), transmitting a first PDU to a terminal, and discarding one or more PDUs based on a status report, using PDCP configuration information and loss timers to manage PDU sets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all PDUs in a PDU set group are transmitted to ensure complete data delivery, then data completeness is improved, but radio resource waste increases when decoding failures occur

Engineering Contradiction:

Improvedata completenessVSAvoidradio resource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The base station performs preliminary actions by transmitting PDCP configuration information including loss timer settings and discard operation indicators before PDU transmission. The terminal uses the loss timer to proactively identify and report missing PDUs, enabling the base station to preemptively discard related PDU sets before they consume radio resources for failed decoding attempts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal monitors received PDUs and provides feedback through status reports indicating missing or lost PDUs. The base station uses this feedback to determine which PDU sets to discard, creating a closed-loop system that adapts transmission decisions based on actual reception status, thereby preventing resource waste from decoding failures.

Inventive Principle:

Principle #23Feedback

2Loss of energy

If PDU loss detection and discard operations are implemented, then radio resource efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveradio resource efficiencyVSAvoidsystem complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The system segments PDU management by introducing PDU set groups with unique identifiers. Each PDU carries PDU set information including group ID and sequence numbers, allowing the base station and terminal to independently track and manage individual PDU sets without complex global state tracking, thereby reducing system complexity while maintaining resource efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

PDCP configuration information acts as an intermediary mechanism, carrying loss timer settings, discard operation indicators, and PDU set management parameters between base station and terminal. This standardized intermediary structure simplifies the interaction complexity by providing a clear interface for loss detection and discard coordination without requiring complex direct control logic.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260046690A1Method and apparatus for processing protocol data units

Publication Date: 2026.02.12 ELECTRONICS & TELECOMM RES INST

AI summary

A method of a base station may comprise: receiving protocol data units (PDUs) from a user plane function (UPF) entity; transmitting a first PDU belonging to the PDUs to a terminal; receiving a status report associated with the first PDU from the terminal; and discarding one or more PDUs belonging to a PDU set group including the first PDU based on the status report.