Initial DL BWP Signaling for Flexible PDCCH Monitoring
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Solution Overview
Problem
Existing radio communication systems face challenges in efficiently managing initial downlink BWP parameters for terminal apparatuses, particularly in scenarios involving reduced capability devices, leading to suboptimal communication efficiency.
Innovation Solution
A terminal apparatus and base station apparatus are designed to monitor and transmit physical downlink control channels based on common and cell-specific parameters for the initial downlink BWP, ensuring efficient communication by indicating frequency location and bandwidth regardless of the availability of additional information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station transmits multiple sets of frequency location and bandwidth information for initial downlink BWP, then different terminal types can be supported, but the information structure becomes more complex
Solution Approach 1:
The frequency location and bandwidth information is segmented into two distinct fields: a first field containing first frequency location and first bandwidth information, and a second field containing second frequency location and second bandwidth information. This segmentation allows different terminal types to be supported through selective interpretation of these fields without increasing overall information structure complexity.
Solution Approach 2:
Different quality levels of frequency information are provided in different fields: the first field provides frequency location information suitable for reduced capability terminals, while the second field provides alternative frequency location information for normal capability terminals. Each field is optimized for specific terminal types, achieving local quality differentiation.
2Adaptability or versatility
If the terminal monitors PDCCH based on multiple BWP configurations, then communication flexibility is improved, but the monitoring complexity increases
Solution Approach 1:
The terminal dynamically selects which BWP configuration to use based on its capability type. Reduced capability terminals monitor PDCCH based on the first BWP configuration (first frequency location and first bandwidth), while normal capability terminals monitor based on the second BWP configuration (second frequency location and second bandwidth). This dynamic selection maintains flexibility while reducing monitoring complexity through capability-based differentiation.
Solution Approach 2:
The system changes key parameters (frequency location, bandwidth) of the initial downlink BWP based on terminal capability. By providing multiple sets of these parameters and allowing terminals to select appropriate ones, the system achieves communication flexibility without requiring all terminals to process all parameter combinations, thus reducing monitoring complexity.
Data Source
AI summary
A terminal apparatus receives first information including second information indicating a parameter for an initial DL BWP and third information indicating a parameter for a PDCCH, the second information including fourth information indicating a first frequency location and bandwidth of the initial DL BWP and fifth information indicating a subcarrier spacing, the frequency location and bandwidth of the initial DL BWP is indicated by sixth information indicating a second frequency location and bandwidth of the initial DL BWP in a case that the first information includes the sixth information, and is indicated by the fourth information in a case that the first information does not include the sixth information, and the PDCCH is monitored based on the third information regardless of whether the first information includes the sixth information or not.