On-Demand SIB Acquisition for Wireless Terminals

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Solution Overview

Problem

In wireless communication systems, the existing method of broadcasting all System Information Blocks (SIBs) periodically wastes radio resources, especially in small cell deployments, as not all UEs require all the information, leading to inefficient use of resources.

Innovation Solution

Implementing an on-demand SIB acquisition method where UEs request only the necessary SIBs, using a Minimal SI to indicate availability and a Paging message to notify changes, allowing for targeted transmission of updated SIBs during specific modification periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all SIBs are broadcast periodically to ensure complete system information availability, then reliability of information delivery is improved, but radio resource efficiency deteriorates

Engineering Contradiction:

Improvesystem information delivery reliabilityVSAvoidradio resource efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system segments SIBs into two categories: Minimum SI (MIB and essential SIBs) that are broadcast periodically to all UEs, and Other SI (optional SIBs) that are transmitted on-demand based on UE requests. This segmentation allows the network to maintain reliable delivery of critical information while avoiding wasteful broadcast of non-essential information to all UEs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system enables UEs to autonomously determine which Additional SI they need based on their specific requirements and service needs. UEs can request only the SIBs relevant to their operations, eliminating the need for the network to broadcast all possible SIBs to all UEs, thus improving radio resource efficiency while maintaining information availability.

Inventive Principle:

Principle #25Self-service

2Loss of information

If periodic broadcast of all SIBs is implemented, then information completeness for system access is improved, but resource utilization in small cells deteriorates

Engineering Contradiction:

Improvesystem information completenessVSAvoidresource utilization efficiency

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The system dynamically adjusts the SIB transmission mode based on UE requirements. For Minimum SI, periodic broadcast is maintained to ensure all UEs have access to essential information. For Other SI, the system switches to on-demand transmission where UEs request specific SIBs based on their service needs, optimizing resource utilization in small cell deployments.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the transmission parameter of SIBs from a static periodic broadcast mode to a dynamic on-demand mode. The Minimum SI maintains periodic transmission with fixed parameters, while Other SI transitions to event-driven transmission where timing and content are determined by actual UE requests and network conditions.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If on-demand SIB request method is used, then radio resource efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveradio resource efficiencyVSAvoidSIB management complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The system introduces an intermediary mechanism where the network maintains a configuration indicating which SIBs are available for on-demand request. This intermediary layer simplifies UE decision-making by providing clear guidance on which SIBs can be requested, reducing the complexity burden on UEs while maintaining radio resource efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Stability of the object's composition

If UEs wait for modification period boundary to request SIB, then synchronization is improved, but access time increases

Engineering Contradiction:

Improvemodification period synchronizationVSAvoidSIB access time

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The system allows UEs to initiate SIB requests before the modification period boundary is reached. UEs can send requests in advance during the current modification period, and the network prepares to transmit the requested SIBs in the upcoming modification period. This preliminary action reduces the effective access time while maintaining synchronization through the modification period framework.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3738326B1Wireless terminal and method for receiving system information blocks

Publication Date: 2024.07.31 SHARP KK

Figure 2
Figure 3~24
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AI summary

A wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from a base station apparatus, a first type system information (SI) block including scheduling information used for configuring SI window(s), the SI window(s) being periodic broadcast occasion(s) for corresponding one or more second type system information blocks (SIBs). The processor circuitry is configured to determine the SI window(s) based on the scheduling information. The receiver circuitry is further configured to perform a reception procedure to attempt to receive at least one of the second type SIBs within the SI window(s) of a current modification period. In a case that the at least one of the second type SIBs is not received within the SI window(s), the receiver circuitry is configured to continue the reception procedure in the current modification period.