On-Demand System Information Transmission via Segmented SI
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Solution Overview
Problem
Existing radio communication systems face inefficiencies in transmitting system information, particularly in managing on-demand and non-demand System Information (SI) across terminal and base station apparatuses.
Innovation Solution
The system includes a method where the base station apparatus transmits non-demand SI, which includes information indicating the types of on-demand SI supported by a cell, and the terminal apparatus receives this information to request specific on-demand SI as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station transmits all system information periodically, then the terminal has complete information, but the transmission bandwidth is wasted and the terminal cannot request only needed information
Solution Approach 1:
The patent segments system information into two categories: periodic system information (transmitted regardless of terminal presence) and on-demand system information (transmitted only when requested). This segmentation allows the base station to differentiate between information that must be broadcast and information that can be delivered on-demand, resolving the contradiction between providing complete information and avoiding bandwidth waste.
Solution Approach 2:
The terminal apparatus autonomously determines which system information it needs and sends requests only for on-demand information. The base station then transmits only the requested information through the PDSCH channel. This self-service mechanism eliminates unnecessary transmissions and optimizes bandwidth utilization while ensuring terminals receive only the information they require.
2Ease of operation
If the base station transmits on-demand system information through PDSCH, then information delivery is flexible, but the terminal cannot monitor when to receive the information
Solution Approach 1:
The base station transmits system information change notifications through the PDCCH channel before actually transmitting the updated on-demand system information via PDSCH. This preliminary action allows the terminal to monitor for notifications and prepare to receive the information at the appropriate time, eliminating unnecessary waiting and ensuring the terminal is ready when the information becomes available.
Solution Approach 2:
The system establishes a feedback mechanism where the terminal sends requests for on-demand system information through the PUCCH or PUSCH channels, and the base station responds by transmitting the requested information through PDSCH. This feedback loop ensures the terminal can actively monitor for information availability and receive it at the optimal time, reducing waiting time and improving operational ease.
3Reliability
If the base station transmits system information change notifications through PDCCH, then the terminal can monitor changes, but the notification mechanism becomes complex
Solution Approach 1:
The patent merges the notification function with the existing PDCCH channel structure, which is already used for downlink control information. By combining system information change notifications with other control signaling on the same channel, the system avoids adding separate complex notification mechanisms while maintaining reliable change monitoring capability.
Solution Approach 2:
The PDCCH channel serves multiple functions: it transmits downlink control information, system information change notifications, and scheduling assignments. This multi-functionality approach allows the notification mechanism to leverage existing infrastructure rather than requiring dedicated complex notification channels, thereby maintaining reliability while minimizing added complexity.
Data Source
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AI summary
A terminal apparatus 1 receives non-demand System Information (SI) including information for indicating on-demand SI supported by a cell, and transmits a system information request to request transmission of on-demand SI supported by the cell, the on-demand SI is transmitted based on the system information request, and the non-demand SI is transmitted regardless of the system information request.