Random Access MSG2/MSG4 Feedback to Reduce Repeated OSI Requests

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Solution Overview

Problem

In 5G communication systems, terminals in idle or inactive states repeatedly request Other System Information (OSI) due to lack of ACK feedback, leading to increased power consumption and potential conflicts in the random access process.

Innovation Solution

A network device configures and sends random access messages (MSG2 or MSG4) with configuration information indicating whether subsequent OSI will be broadcast, allowing terminals to determine appropriate processing without repeated requests, thereby reducing power consumption and conflict probability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminals repeatedly send Other SI requests without receiving ACK feedback, then the terminal can ensure it receives the required system information, but the terminal power consumption increases significantly

Engineering Contradiction:

Improvereliability of receiving Other SIVSAvoidterminal power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network device provides feedback to the terminal by sending an indication message that explicitly tells the terminal whether the requested Other SI will be broadcast. This feedback mechanism allows the terminal to stop repeated requests when it knows the SI will be broadcast, thereby reducing power consumption while maintaining reliability of receiving the required system information.

Inventive Principle:

Principle #23Feedback

2Reliability

If terminals repeatedly send Other SI requests without receiving ACK feedback, then the terminal can ensure it receives the required system information, but the probability of random access conflicts increases

Engineering Contradiction:

Improvereliability of receiving Other SIVSAvoidrandom access conflict probability

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The indication message sent by the network device provides feedback that informs terminals whether Other SI will be broadcast. This feedback prevents multiple terminals from simultaneously retransmitting requests, thereby reducing random access conflicts while ensuring terminals can still receive the required system information reliably.

Inventive Principle:

Principle #23Feedback

3Device complexity

If the network device does not send ACK feedback or broadcast indication, then the network device reduces signaling overhead, but terminals cannot determine whether to continue requesting OSI

Engineering Contradiction:

Improvesignaling overheadVSAvoidterminal ability to determine OSI request behavior

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The network device performs a preliminary action by sending an indication message before the terminal would otherwise repeat its request. This indication message provides the terminal with advance information about whether Other SI will be broadcast, allowing the terminal to determine its next action without requiring a full ACK feedback or continuous request-retry mechanism, thus balancing signaling overhead with terminal operational clarity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250280450A1System information transmission method, terminal and network device

Publication Date: 2025.09.04 VIVO MOBILE COMM CO LTD

AI summary

A system information transmission method, a terminal and a network device are provided. The method includes: receiving request information for requesting target Other System Information sent by a terminal; configuring a random access message 2 or a random access message 4 for the terminal based on the request information; and sending the random access message 2 or the random access message 4 to the terminal.