Terminal PL-RS Updates Across Serving Cells via MAC CE
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Solution Overview
Problem
In future radio communication systems, updating pathloss reference signals (PL-RS) for each serving cell or bandwidth part (BWP) can lead to increased overhead and latency, resulting in reduced throughput.
Innovation Solution
A terminal and base station system that supports simultaneous updating of PL-RS for multiple serving cells or bandwidth parts (BWPs) using Medium Access Control (MAC) elements, allowing for efficient and coordinated pathloss reference signal management across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PL-RS is updated for each serving cell/BWP individually, then pathloss estimation accuracy is maintained, but overhead and latency increase
Solution Approach 1:
The patent combines multiple individual PL-RS updates for different serving cells and BWPs into a single group update operation. By grouping cells and BWPs that share common pathloss characteristics, the system performs unified PL-RS updates rather than individual updates, thereby reducing the total number of update operations and associated latency while maintaining adequate pathloss estimation accuracy for each group.
Solution Approach 2:
The patent creates a universal PL-RS update mechanism that can simultaneously update pathloss reference signals across multiple serving cells and BWPs. This multi-functional update approach allows a single update operation to serve multiple cells/BWPs, reducing overhead and latency compared to cell-specific individual updates, while still providing accurate pathloss estimation for each cell within the group.
2Measurement precision
If PL-RS is updated for each serving cell/BWP individually, then pathloss estimation accuracy is maintained, but signaling overhead increases
Solution Approach 1:
The patent merges multiple individual PL-RS update signaling operations into a single group update signaling operation. By consolidating update commands for multiple cells and BWPs into one signaling message, the system significantly reduces the quantity of signaling overhead while maintaining the ability to provide accurate pathloss estimation for each cell through the grouped update mechanism.
Solution Approach 2:
The patent implements a universal group update mechanism that performs multiple PL-RS updates through a single signaling operation. This multi-functional approach allows one signaling message to update pathloss reference signals across multiple serving cells and BWPs simultaneously, thereby reducing the total signaling overhead compared to individual cell updates while preserving estimation accuracy.
3Manufacturing precision
If PL-RS is updated for each serving cell/BWP individually, then pathloss control precision is maintained, but system complexity increases
Solution Approach 1:
The patent combines the complexity of multiple individual PL-RS update operations into a single group update operation. By merging the control logic for updating pathloss reference signals across multiple cells and BWPs into one unified process, the system reduces overall system complexity while maintaining precise pathloss control through the grouped update mechanism.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives a list indicating one or more serving cells, and a control section that applies, when a medium access control-control element (MAC CE) indicating one serving cell ID and a pathloss reference signal ID included in the list is received, the pathloss reference signal ID to a sounding reference signal (SRS) resource set of each of the one or more serving cells. According to an aspect of the present disclosure, a PL-RS can be appropriately updated.