Downlink Control Information Limits for Dual-Role Scheduling Cells
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Solution Overview
Problem
In the 5G mobile communication technology, there is a need to determine the maximum number of unicast DCI that can be decoded by a UE on two scheduling cells for the same scheduled cell, as current systems restrict PDCCH resources and do not account for scenarios where a P(S)Cell can be both a scheduling and scheduled cell.
Innovation Solution
The technology determines the maximum number of unicast DCI that can be decoded by UE across monitoring occasions within a slot or span of the scheduling cells, considering factors such as subcarrier spacing, cell priority, span priority, and SCS relationship, to ensure consistent PDCCH detection across multiple scheduling cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PDCCH resources are restricted in current systems, then device complexity is reduced, but reliability of PDCCH detection deteriorates when a P(S)Cell serves as both scheduling and scheduled cell
Solution Approach 1:
The patent segments the determination of maximum DCI by introducing distinct parameters for scheduling cells (K_scheduling) and scheduled cells (K_scheduled). This segmentation allows the system to independently manage DCI limits for cells serving different roles, resolving the contradiction by enabling reliable detection in dual-role scenarios without uniformly increasing complexity across all cells.
Solution Approach 2:
The patent implements dynamic determination of maximum DCI based on cell roles and configurations. The parameters K_scheduling and K_scheduled are dynamically adjusted according to whether a cell functions as scheduling cell, scheduled cell, or both, allowing the system to adapt to varying operational scenarios and maintain detection reliability without permanent complexity increases.
2Ease of operation
If the system does not account for P(S)Cell as both scheduling and scheduled cell, then ease of operation is maintained, but loss of information occurs in PDCCH detection
Solution Approach 1:
The patent introduces intermediary parameters (K_scheduling and K_scheduled) that mediate between the simple operation requirement and the need for accurate PDCCH detection. These parameters act as intermediaries that carry role-specific information through the system, enabling proper detection without complicating the overall operational framework.
Solution Approach 2:
The patent changes the parameter structure from a single DCI limit to multiple role-specific parameters. By changing from a uniform DCI parameter to differentiated K_scheduling and K_scheduled parameters, the system preserves operational simplicity while preventing information loss in dual-role cell scenarios.
3Productivity
If maximum DCI is determined without considering cell roles, then productivity is improved through faster processing, but measurement precision of DCI capacity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the roles of cells (scheduling, scheduled, or both) and assigning appropriate DCI parameters before actual DCI determination. This preliminary classification enables fast processing during operation while ensuring accurate DCI capacity measurement through role-appropriate parameter selection.
Data Source
AI summary
Methods and systems for techniques for determining downlink control information in wireless networks are disclosed. In one example aspect, the method includes performing, by a wireless device, a determination of a maximum number of downlink control information (DCI) decodable by the wireless device within a time gap of a scheduling cell per a first number of scheduled cells, wherein the DCI is used to schedule downlink (DL) data or uplink (UL) data.