PDCCH-Based Random Access Failure Detection for Terminals

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Solution Overview

Problem

Terminal devices experience delays in determining unsuccessful random access, leading to increased power consumption and inefficiency in existing communication systems.

Innovation Solution

The terminal device decodes downlink control information to determine whether to continue or abort the random access procedure based on resource allocation, time intervals, and feature parameters, and feature parameters, allowing the terminal to determine the success of the random access, thereby shortening the delay in determining the success of the random access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal device waits for the contention resolution timer to expire before determining random access failure, then the determination is reliable, but the delay increases and power consumption increases

Engineering Contradiction:

Improverandom access failure determination reliabilityVSAvoidrandom access determination delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network device performs preliminary action by sending downlink control information on the PDCCH before the terminal device needs to determine random access failure. This early indication allows the terminal to abort the random access procedure immediately without waiting for the contention resolution timer to expire, thus reducing delay while maintaining reliable failure determination

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network device provides feedback to the terminal device through the PDCCH to indicate whether the terminal should continue or abort the random access procedure. This feedback mechanism enables the terminal to make accurate failure determination based on network status, improving both reliability and reducing unnecessary waiting time

Inventive Principle:

Principle #23Feedback

2Reliability

If the terminal device waits for the contention resolution timer to expire before determining random access failure, then the determination is accurate, but power consumption increases

Engineering Contradiction:

Improverandom access failure determination accuracyVSAvoidterminal device power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network device sends downlink control information on the PDCCH as a preliminary indication before the terminal would otherwise determine failure by timer expiration. This allows the terminal to stop monitoring and processing early, reducing power consumption while maintaining accurate failure determination through the network-provided indication

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network device provides feedback via PDCCH that enables the terminal to accurately determine random access status without continuous timer monitoring. This feedback mechanism allows the terminal to power down relevant components earlier, reducing energy consumption while maintaining determination accuracy

Inventive Principle:

Principle #23Feedback

3Reliability

If the terminal device continues monitoring for random access confirmation, then it ensures accurate status determination, but communication efficiency decreases

Engineering Contradiction:

Improverandom access status determinationVSAvoidcommunication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The network device performs preliminary action by sending downlink control information on the PDCCH to indicate the random access status before the terminal would otherwise continue monitoring. This enables the terminal to switch to a new random access procedure earlier, improving communication efficiency while maintaining reliable status determination through the network indication

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network device provides feedback via PDCCH that enables the terminal to accurately determine random access status and proceed accordingly. This feedback mechanism improves communication efficiency by eliminating unnecessary monitoring while maintaining determination reliability through the authoritative network indication

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250380271A1Communication Method and Communication Apparatus

Publication Date: 2025.12.11 HUAWEI TECH CO LTD

AI summary

A communication method includes: After sending uplink information to a network device, a terminal device receives, from the network device, a physical downlink control channel (PDCCH) carrying downlink control information; and the terminal device decodes the PDCCH. After the decoding succeeds, the terminal device obtains the downlink control information, and determines, based on the downlink control information, whether to continue to operate the downlink information. When the terminal device determines, based on the downlink control information, not to continue to operate the downlink information, the terminal device can further determine that random access is unsuccessful.