Acquiring Non-Required System Information During RRC Connected State

Solution Overview

Problem

In LTE wireless communication systems, the transition from RRC_CONNECTED to RRC_IDLE state can cause unnecessary delays due to the acquisition of non-required system information, leading to potential call failures and increased likelihood of going out of service.

Innovation Solution

Acquire and store non-required system information during the RRC_CONNECTED state after handover to a new cell, allowing for a direct transition to RRC_IDLE state without the need for additional information acquisition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE acquires all required system information when transitioning from RRC_CONNECTED to RRC_IDLE state, then the UE ensures complete system information for idle state operation, but the transition delay increases potentially causing call failures and service outages

Engineering Contradiction:

Improvesystem information completenessVSAvoidtransition delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs preliminary acquisition of non-required system information (SIB3-SIB8) during the handover process while in RRC_CONNECTED state, before the transition to RRC_IDLE state occurs. This advance preparation eliminates the need to acquire this information after state transition, thereby reducing transition delay while ensuring complete system information availability when idle state operation begins

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies beforehand cushioning by acquiring additional system information blocks (SIB3-SIB8) that are not immediately required in RRC_CONNECTED state but will be needed in RRC_IDLE state. This proactive acquisition cushions against the potential delay and reliability issues that would occur if the information were acquired after state transition

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Speed

If the UE acquires minimal system information in RRC_CONNECTED state, then the transition process is faster, but the UE may lack required information for immediate idle state operation

Engineering Contradiction:

Improvetransition speedVSAvoidservice continuity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The UE performs preliminary acquisition of non-required system information (SIB3-SIB8) during the handover process while in RRC_CONNECTED state, before the transition to RRC_IDLE state occurs. This advance preparation eliminates the need to acquire this information after state transition, thereby reducing transition delay while ensuring complete system information availability when idle state operation begins

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuity of useful action by ensuring that system information acquisition is completed during the handover process itself, rather than interrupting the transition to RRC_IDLE state. The acquisition of SIB3-SIB8 occurs as part of the continuous handover procedure, preventing service interruptions while ensuring complete information availability

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentEP2497325B1System information acquisition in connected mode

Publication Date: 2018.09.26 QUALCOMM INC

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AI summary

A method of wireless communication includes acquiring at least one non-required system information from a cell while in a radio resource control connected state. The non-required system information is system information that is not required in the radio resource control connected state. The method includes transitioning from the radio resource control connected state to a radio resource control idle state on the cell without acquiring the at least one non-required system information.