User Terminal SP-CSI Report Timing Control via MAC CE
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Solution Overview
Problem
In future radio communication systems, such as NR, controlling the activation of semi-persistent CSI reports using a MAC CE is challenging due to variability in UE performance, leading to potential throughput deterioration.
Innovation Solution
A user terminal with a receiving section to detect information indicating the start of a semi-persistent CSI report and a control section to determine the timing of the report based on the relation between feedback report timing and CSI report timing, ensuring appropriate control of SP-CSI reports even when activated by a MAC CE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SP-CSI report activation is controlled using MAC CE, then activation flexibility is improved, but timing synchronization between UE and base station deteriorates due to variable UE processing performance
Solution Approach 1:
The base station transmits timing indication information in advance along with the MAC CE activation command. This preliminary action provides the UE with predetermined timing reference before the actual SP-CSI report transmission, allowing the UE to synchronize its reporting timing with the base station's expectation regardless of its processing speed variations.
Solution Approach 2:
Timing indication information serves as an intermediary element between the MAC CE activation command and the actual SP-CSI report transmission. It mediates the timing relationship by providing a reference point that both the base station and UE can use to align their actions, decoupling the activation command from the exact transmission timing.
2Ease of operation
If SP-CSI report timing is determined without considering feedback report timing, then reporting simplicity is improved, but throughput deteriorates due to timing conflicts
Solution Approach 1:
The UE determines SP-CSI report timing based on the timing of feedback reports (such as HARQ-ACK). This feedback mechanism allows the UE to align SP-CSI reporting with its existing feedback transmission schedule, avoiding conflicts while maintaining relatively simple operation. The timing indication information from the base station provides the reference, and the UE adjusts based on its feedback timing.
Solution Approach 2:
The SP-CSI report timing is dynamically adjusted based on the actual feedback report timing conditions. Rather than using a fixed timing offset from the MAC CE reception, the UE adapts the reporting timing to its feedback transmission schedule, making the system flexible enough to avoid conflicts while maintaining simplicity.
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes a receiving section that receives information indicating start of report of semi-persistent channel state information (SP-CSI (Semi-Persistent Channel State Information) report), and a control section that determines timing of the SP-CSI report, based on whether or not there is relation between timing of a feedback report for reception of the information and the timing of the SP-CSI report. According to one aspect of the present disclosure, SP-CSI report and/or detection can be appropriately controlled even when SP-CSI report activation is indicated by using MAC CEs (Medium Access Control Control Elements).