UE Downlink Data Verification in Idle-State Small Data Transfer

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Solution Overview

Problem

Existing communication systems lack effective solutions to ensure the security of downlink data transmission during small data transmission in idle or inactive states of user equipment (UE) without dedicated resources.

Innovation Solution

A method and apparatus for verifying and processing downlink data in user equipment (UE) by performing contention resolution verification and integrity protection on data types such as DRB and SRB, ensuring security through high-level protocol entities like RLC and PDCP, and implementing failure recovery processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal receives and buffers downlink data before data notification, then data loss is prevented, but terminal power consumption increases

Engineering Contradiction:

Improvedata loss preventionVSAvoidterminal power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network side performs preliminary actions by pre-notifying the terminal about upcoming downlink data through RAR messages before the actual data transmission. This allows the terminal to activate its receiver only when needed, preventing unnecessary buffering and reducing power consumption while avoiding data loss.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the terminal sends HARQ-ACK feedback to confirm data reception status. This feedback loop enables the network to track which data has been successfully received and which needs retransmission, ensuring reliability without requiring continuous buffering at the terminal.

Inventive Principle:

Principle #23Feedback

2Device complexity

If the network transmits downlink data without pre-notification, then signaling overhead is reduced, but data may be lost if terminal buffer is full

Engineering Contradiction:

Improvesignaling overheadVSAvoiddata delivery reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The network performs preliminary notification actions by sending RAR messages ahead of actual data transmission. This preliminary action reserves buffer space at the terminal and ensures the terminal is ready to receive data, preventing data loss due to full buffers while maintaining reasonable signaling overhead.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If the terminal continuously monitors for downlink data, then data reception timeliness is improved, but power consumption increases

Engineering Contradiction:

Improvedata reception timelinessVSAvoidterminal power consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The terminal adopts periodic monitoring based on scheduled RAR messages rather than continuous monitoring. The terminal activates its receiver at specific intervals when RAR messages are expected, ensuring timely data reception while minimizing power consumption by keeping the receiver off during non-monitoring periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP4149133B1Method and apparatus for processing downlink data, and terminal

Publication Date: 2026.05.13 VIVO MOBILE COMM CO LTD

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AI summary

This application discloses a downlink data processing method, apparatus, and terminal. The downlink data processing method includes: receiving predetermined downlink data; verifying the downlink data and processing the downlink data based on a verification result.