NACK-Only Feedback and Scheduling Request Overlap Handling
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Solution Overview
Problem
The existing technologies for multicast/broadcast services in 5G NR systems face challenges in handling NACK-only feedback when it overlaps with Scheduling Request (SR) in time, leading to resource utilization inefficiencies and ambiguity in determining which UE sent the SR.
Innovation Solution
A terminal and radio communication method that includes a reception unit for data via a downlink channel, a transmission unit for feedback, and a control unit that performs specific control for NACK-only feedback and SR when they overlap in time, allowing for appropriate handling and multiplexing of resources to avoid collisions and ensure accurate SR detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NACK-only feedback and SR are transmitted simultaneously using the same time-frequency resources, then resource utilization efficiency is improved, but resource collision occurs and the base station cannot accurately determine which UE sent the SR
Solution Approach 1:
The patent segments the uplink control information by creating separate PUCCH resources for NACK-only feedback and SR. When NACK-only feedback and SR overlap in time, the terminal uses different PUCCH resources for each, preventing resource collision and enabling the base station to accurately detect both signals simultaneously.
Solution Approach 2:
The patent introduces a new dimension for resource differentiation by configuring multiple PUCCH resources with different time-frequency assignments. Instead of using the same resource for both NACK-only feedback and SR, the system assigns them to different resources in the time-frequency domain, resolving the collision while maintaining efficient resource utilization.
2Adaptability or versatility
If NACK-only feedback overlaps with Unicast HARQ-ACK, CSI or PUSCH, then resource flexibility is improved by allowing multiplexing, but complexity increases in determining which signal takes precedence
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority rules and multiplexing behaviors through higher-layer signaling. The terminal is provided with advance instructions on how to handle overlaps between NACK-only feedback and other uplink signals, eliminating the need for complex real-time decision-making and reducing processing complexity.
Solution Approach 2:
The patent changes the parameter of resource assignment by dynamically adjusting PUCCH resource allocation based on the type of uplink signal. When NACK-only feedback overlaps with other signals, the system modifies the resource parameters (time-frequency assignment, format) to accommodate multiplexing, maintaining flexibility while simplifying control through predefined rules.
3Productivity
If the same PUCCH resource is used for both NACK-only feedback and SR, then resource efficiency is improved, but the base station cannot distinguish which UE sent the SR when multiple UEs use the same resource
Solution Approach 1:
The patent segments the PUCCH resources by configuring separate resources for NACK-only feedback and SR transmissions. This segmentation ensures that even when multiple UEs are active, each signal type has its dedicated resource, preventing identification conflicts and maintaining resource efficiency through structured allocation.
Solution Approach 2:
The patent introduces an intermediary mechanism through higher-layer signaling that provides explicit resource allocation instructions to each terminal. This intermediary layer coordinates resource usage between NACK-only feedback and SR, ensuring that the base station can distinguish which UE sent the SR while maintaining efficient resource utilization through centralized control.
Data Source
AI summary
A terminal comprising: a reception unit that receives data via a downlink channel in data delivering for a plurality of terminals; a transmission unit that transmits a feedback on the data; and a control unit that controls the feedback; wherein the feedback includes a first feedback in a manner for transmitting a negative response without transmitting an affirmative response, and the control unit performs a specific control related to the first feedback and a scheduling request requesting a transmission of an uplink channel, when the scheduling request overlaps with the first feedback in time.