Aperiodic CSI Reporting Control for Uplink Signal Overlap
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Solution Overview
Problem
Legacy LTE systems' CSI reporting methods are challenging to apply in next-generation mobile communication systems like NR, due to differences in uplink shared channel configurations, leading to difficulties in controlling CSI reporting effectively.
Innovation Solution
A user terminal with a transmission section that transmits UL signals using an uplink shared channel based on base station instructions, and a control section that manages transmission durations to prevent overlap or selects which signals to transmit when overlap occurs, allowing for flexible CSI reporting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy LTE CSI reporting control methods are applied in NR systems with different uplink shared channel configurations, then the existing control procedures can be reused, but the CSI reporting cannot be effectively controlled due to configuration differences
Solution Approach 1:
The patent changes the time unit parameter from subframe (legacy LTE) to symbol (NR), and modifies the transmission duration parameter to be configurable per CSI report. This allows the control method to adapt to NR's finer time granularity while maintaining the essence of legacy control procedures.
Solution Approach 2:
The patent introduces dynamic control where the base station can independently adjust the transmission duration of each CSI report via DCI signaling. This dynamic adjustment capability enables effective control in NR systems despite configuration differences from legacy LTE.
2Adaptability or versatility
If multiple UL signals are transmitted simultaneously in NR with symbol-level control, then transmission flexibility is improved, but transmission durations may overlap causing control complexity
Solution Approach 1:
The patent performs preliminary allocation of non-overlapping time resources for multiple UL signals. By pre-configuring transmission durations and start symbols to avoid overlap, the system maintains transmission flexibility while preventing the complexity that would arise from handling overlapping transmissions.
Solution Approach 2:
The patent segments the uplink transmission time resources by assigning different symbol ranges to different UL signals. This segmentation ensures that each signal has its dedicated time slot, eliminating overlap complexity while preserving overall system flexibility.
3Productivity
If transmission durations of multiple UL signals are allowed to overlap, then resource utilization is improved, but processing complexity and latency increase
Solution Approach 1:
The patent applies partial overlapping where only necessary portions of transmissions overlap while critical processing occurs sequentially. This approach achieves improved resource utilization without incurring the full penalty of simultaneous processing complexity and latency.
Data Source
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Figure 3A~3B
AI summary
To appropriately control UL transmission such as a CSI reporting when performing communication by applying a different configuration from those of legacy LTE systems, a user terminal according to one aspect of the present disclosure includes: a transmission section that transmits one or more UL signals by using an uplink shared channel based on an instruction from a base station; and a control section that controls the transmission assuming that transmission durations of a plurality of UL signals do not overlap in a same symbol, or, when at least part of the transmission durations of the plurality of UL signals overlap in the same symbol, performs control to select and transmit the part of the UL signals.