Data Packet Discard Policy for PDCP Reordering Overhead

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Solution Overview

Problem

Current data transmission methods fail to consider the association relationship between continuously transmitted data packets, leading to unnecessary transmission overhead and inefficient processing due to the expiration of reordering timers in the PDCP layer when data packets are received discontinuously.

Innovation Solution

Discarding data packets that have failed to be sent or have an association relationship with the failed packet, based on their sending status, to avoid unnecessary transmission and processing, using methods such as HARQ status, discard timers, and discard policies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data packets are transmitted continuously without considering association relationships, then transmission completeness is maintained, but transmission overhead increases and processing efficiency decreases

Engineering Contradiction:

Improvetransmission completenessVSAvoidtransmission overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The transmitting device performs preliminary actions by monitoring HARQ status and identifying association relationships between data packets before transmission completes. When a packet fails, the device proactively determines which associated packets should be discarded, preventing unnecessary retransmissions and reducing transmission overhead while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If reordering timer is initiated to wait for non-continuous data messages, then packet reordering is achieved, but timer expiration causes processing inefficiency

Engineering Contradiction:

Improvepacket orderVSAvoidprocessing efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The device uses HARQ status feedback to monitor the transmission state of each data packet. This feedback mechanism allows the system to identify failed packets and their associations in real-time, enabling proactive discarding decisions that eliminate the need for lengthy reordering timer waits, thus improving processing efficiency while maintaining packet order stability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Instead of passively waiting for the reordering timer to expire, the system performs preliminary actions by continuously monitoring HARQ status and proactively identifying packets that should be discarded based on their association relationships with failed packets, thereby eliminating unnecessary waiting time.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If all data packets are transmitted regardless of association relationships, then no data is lost, but air interface load increases

Engineering Contradiction:

Improvedata delivery validityVSAvoidair interface load

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The device extracts and identifies data packets that have association relationships with failed packets based on HARQ status monitoring. These identified packets are then removed from the transmission queue proactively, eliminating unnecessary air interface load while ensuring that only valid, independently transmittable packets occupy the air interface.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20260113281A1Method and device for sending data packets, electronic device and readable storage medium

Publication Date: 2026.04.23 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method for sending data packets, including: discarding at least one data packet in a process of sending the data packets to a second electronic device.