On-Demand System Information Provision in 5G Radio Terminals
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Solution Overview
Problem
In conventional LTE systems, base stations wastefully consume power and resources by broadcasting system information regardless of its usage, which is inefficient and not optimized for 5G mobile communication systems.
Innovation Solution
Classifying system information into minimum and on-demand categories, where minimum information is periodically broadcast, and on-demand information is provided only upon request from the radio terminal, allowing for efficient resource management and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station periodically broadcasts all system information, then the radio terminal can always obtain the latest system information, but the power and radio resources of the base station are wastefully consumed
Solution Approach 1:
The patent segments system information into two categories: minimum system information (broadcast periodically) and other system information (provided on-demand). This segmentation allows the base station to broadcast only essential information periodically while providing additional information only when requested by radio terminals, thereby reducing unnecessary power consumption while ensuring availability of critical system information.
Solution Approach 2:
The patent extracts and separates the most essential system information (minimum SI) from the complete set of system information. The minimum SI is broadcast periodically to ensure availability, while the remaining other SI is extracted and provided on-demand through dedicated signaling, reducing the power consumption associated with broadcasting all system information.
2Loss of energy
If the base station provides on-demand system information, then power consumption is reduced, but the radio terminal cannot obtain system information immediately without requesting it
Solution Approach 1:
The patent applies preliminary action by having the base station broadcast minimum system information periodically in advance. This minimum SI includes essential access information and configuration parameters that radio terminals need to initially connect and operate. By providing this critical information in advance through periodic broadcasting, terminals can quickly camp on cells and only request additional other SI when specifically needed, thus reducing both power consumption and information acquisition time.
3Reliability
If the radio terminal requests on-demand system information from every cell it camps on, then it ensures it has the latest information, but it increases signaling overhead and delays connection establishment
Solution Approach 1:
The patent applies local quality by making the on-demand system information provision specific to each cell. The base station includes in the minimum SI an indicator that informs the radio terminal whether other SI is available in the current cell. The terminal then selectively requests other SI only from cells where it is actually needed, rather than requesting from every cell. This localized approach reduces unnecessary signaling overhead and accelerates connection establishment while ensuring accuracy of system information.
Data Source
AI summary
A user equipment, apparatus and method receives a first system information block (SIB) that is broadcast from a first cell and includes information necessary for accessing the first cell, receives a second SIB other than the first SIB from the first cell in response to a request transmitted by the user equipment for the second SIB, receives and stores in memory area information from the first cell, the area information indicating a predetermined area comprising a plurality of cells including the first cell where the second SIB is applicable, and when the user equipment camps on a second cell, receives information from the second cell indicating an area that the second cell belongs to. A determination is made as to whether to transmit a request for the second SIB to the second cell at least based on the stored area information and the information received from the second cell.