Terminal BWP Activation via Cross-Carrier Scheduling DCI
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Solution Overview
Problem
There is a need for an efficient method to specify a Bandwidth Part (BWP) to be activated in a terminal when scheduling is performed for multiple cells in a radio communication system, particularly in New Radio (NR) Dynamic Spectrum Sharing (DSS) scenarios, where existing methods face challenges in minimizing the size of Downlink Control Information (DCI) used for cross-carrier scheduling.
Innovation Solution
A terminal is equipped with a receiving unit to receive scheduling information through a first component carrier and a control unit that activates the appropriate BWP based on identification information included in the scheduling information, allowing efficient selection of BWPs across multiple component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single DCI is used for scheduling multiple cells, then the DCI size can be minimized, but it becomes difficult to specify BWP activation for multiple cells efficiently
Solution Approach 1:
The patent segments the BWP indication mechanism by introducing a separate BWP indication field that operates independently from the carrier indication field. This allows the DCI to efficiently specify BWPs for multiple cells without increasing the overall DCI size, as the BWP indication is segmented into cell-specific indications rather than requiring separate DCIs for each cell.
Solution Approach 2:
The patent makes the DCI structure universal by enabling a single DCI to handle both carrier indication and BWP indication for multiple cells simultaneously. The DCI format is designed to accommodate multiple cell schedules and BWP activations through unified field structures, allowing one DCI to perform multiple functions that would otherwise require separate control messages.
2Adaptability or versatility
If BWP indication field is included in DCI, then BWP can be specified for terminal, but DCI size increases
Solution Approach 1:
The patent merges the carrier indication field and BWP indication field into a unified DCI structure where both functions are accomplished through combined field operations. By merging these indication mechanisms, the patent achieves BWP specification capability without proportionally increasing DCI size, as the merged structure allows efficient bit utilization and shared interpretation between carrier and BWP indications.
Solution Approach 2:
The patent changes the parameter structure of the DCI by introducing dynamic field configurations where the presence and interpretation of indication fields can change based on service requirements. This allows the DCI to adapt its size and content parameters, including BWP indication, only when necessary, rather than always maintaining a fixed large size.
3Productivity
If cross-carrier scheduling is performed by SCell PDCCH, then PCell scheduling capacity is improved, but coordination complexity increases
Solution Approach 1:
The patent introduces a unified DCI structure as an intermediary that mediates between SCell PDCCH resources and PCell scheduling requirements. This intermediary DCI format standardizes the cross-carrier scheduling mechanism, providing a common interface that simplifies coordination between cells while maintaining high scheduling capacity through efficient resource utilization.
Data Source
AI summary
A terminal includes a receiving unit that receives, through a first component carrier of a plurality of component carriers forming carrier aggregation, scheduling information for one or more second component carriers of the plurality of component carriers; and a control unit that activates, based on identification information of a Bandwidth part (BWP) included in the scheduling information, the BWP of a plurality of BWPs configured for the one or more second component carriers.