User Terminal Uplink Control Channel Overlap Handling
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Solution Overview
Problem
In future radio communication systems like 5G or NR, there is a challenge in properly controlling uplink (UL) transmissions of acknowledgement signals (A/N) in response to downlink (DL) transmissions with different requirements, as feedback timings may overlap, leading to potential interference and inefficiencies.
Innovation Solution
A user terminal is equipped with a transmitting section that sends acknowledgement signals for multiple DL transmissions using different uplink control channels, allowing for controlled prioritization and timing adjustments to prevent overlap, such as preferentially transmitting acknowledgement signals for later-timed DL transmissions using a PUCCH configured for that purpose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple acknowledgement signals are transmitted using the same uplink control channel at overlapping timings, then the system maintains simplicity in channel configuration, but transmission reliability deteriorates due to potential interference and collision between signals
Solution Approach 1:
The patent segments the uplink control channel resources by configuring different uplink control channels (e.g., different PUCCH resources) for different acknowledgement signals. This segmentation allows multiple A/N signals to be transmitted on separate channels, avoiding interference while maintaining overall system simplicity.
Solution Approach 2:
The patent resolves timing overlap by transitioning from a single-dimensional time-based transmission to a multi-dimensional approach using different uplink control channel resources (frequency, code, or time slots). This dimensional expansion allows simultaneous transmission without collision.
2Ease of operation
If acknowledgement signals are transmitted at their scheduled timings without adjustment, then the system maintains simplicity in transmission timing control, but transmission precision deteriorates due to overlapping feedback timings causing signal collision
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple uplink control channels with different timing characteristics before transmission occurs. This allows the system to anticipate and prevent timing overlaps before they happen, maintaining operational simplicity while achieving precise feedback timing.
Solution Approach 2:
The patent introduces dynamic timing adjustment mechanisms that allow the transmission timing of acknowledgement signals to be flexibly adapted based on channel conditions and traffic requirements, resolving precision issues while maintaining ease of operation through automated control.
3Device complexity
If the system uses a single uplink control channel for all acknowledgement signals, then the device complexity is reduced, but the productivity of the system decreases due to inefficient resource utilization and potential retransmissions
Solution Approach 1:
The patent implements multi-functionality by designing uplink control channels that can serve multiple purposes: different PUCCH resources can handle different types of acknowledgements, carry both data and control information, and adapt to various traffic patterns. This increases productivity while maintaining reasonable complexity through standardized multi-purpose channel design.
Data Source
AI summary
To properly control UL transmissions of A/N in response to a plurality of DL transmissions with different requirements and the like, one aspect of a user terminal in the present disclosure has a transmitting section that transmits a first delivery acknowledgement signal (A/N) in response to a first PDSCH and a second A/N in response to a second PDSCH transmitted later than the first PDSCH, and a control section that controls to transmit at least one of the first A/N and the second A/N, using one of an uplink control channel configured for the first A/N and another uplink control channel configured for the second A/N, in a case where transmission timing of the first A/N overlaps transmission timing of the second A/N.