On-Demand System Information Delivery in Wireless Terminals
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Solution Overview
Problem
In wireless communication systems, the existing all-broadcast-based periodic delivery method for System Information Blocks (SIBs) is inefficient, particularly in small cell deployments, leading to wastage of radio resources, and there is a need for more efficient methods to obtain and update SIBs, as well as to determine SI message acquisition process failures and remedial processes.
Innovation Solution
A method and apparatus for a wireless terminal and base station to implement on-demand SI message delivery, where the wireless terminal initiates an SI acquisition process after determining a successful SI request procedure, and re-acquires SIBs upon failure, using scheduling information and broadcast status indications to manage SI message delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-broadcast-based periodic delivery method is used for SIBs, then system information is reliably delivered to all UEs, but radio resources are wasted especially in small cell deployments
Solution Approach 1:
The patent implements dynamic SI delivery mode selection between periodic broadcast and on-demand delivery based on network conditions and UE requirements. The base station can switch between broadcast mode (for reliability) and unicast/on-demand mode (for resource efficiency), making the system adaptable to different scenarios such as small cell deployments versus macro cell coverage
Solution Approach 2:
The patent applies different delivery methods to different SIBs and different UEs based on local requirements. Critical SIBs are broadcast periodically for reliability, while non-critical SIBs are delivered on-demand to specific UEs that request them, optimizing resource usage for each specific case rather than using a uniform approach
2Loss of energy
If on-demand SI message delivery is implemented, then radio resource efficiency is improved, but complexity of SI acquisition process increases
Solution Approach 1:
The patent segments system information into different categories (critical vs. non-critical SIBs) and implements different acquisition procedures for each. Critical SIBs use simplified periodic broadcast acquisition, while non-critical SIBs use on-demand unicast delivery with separate request-response procedures, managing complexity through structured segmentation
3Adaptability or versatility
If periodic broadcast of all SIBs is performed, then all UEs can access system information, but resource utilization is inefficient particularly in small cells
Solution Approach 1:
The patent implements dynamic adaptation of SI delivery mechanisms based on network type and UE density. In small cell scenarios with low UE density, on-demand unicast delivery is used to improve resource efficiency. In macro cell scenarios with high UE density, periodic broadcast is used to ensure all UEs can access system information, thus adapting to different deployment conditions
Data Source
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AI summary
A wireless terminal communicates over a radio interface with an access node of a radio access network (RAN), and method of operating same. The wireless terminal comprises receiver circuitry, processor circuitry, and transmitter circuitry. The processor circuitry is configured to initiate a first type system information block (SIB) acquisition process to receive a first type SIB. The first type SIB comprises scheduling information of a system information (SI) message, the SI message comprising at least one second type SIB, and an indication of broadcast status for the SI message, the indication indicating on-demand delivery. The receiver circuitry is configured to receive the first type SIB. The transmitter circuitry configured to transmit an SI request message to request the SI message. The processor circuitry is further configured to initiate an SI message acquisition process to receive the SI message and, in a case that a stored version of one of the at least one second type SIB is not valid, the first type SIB acquisition process is initiated upon a failure of the SI message acquisition process.