Subslot PUCCH Resources for Low-Latency URLLC HARQ-ACK Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high flexibility and efficiency, particularly in supporting ultra-reliable low-latency communication (URLLC) services, due to limitations in PUCCH resource allocation and HARQ-ACK feedback mechanisms.
Innovation Solution
The implementation of enhanced PUCCH formats with higher transmit power, transmit diversity, and subslot structures for PUCCH resource configuration, allowing multiple HARQ-ACK feedback instances within a slot to meet URLLC reliability and latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PUCCH resource allocation is used, then device complexity is reduced, but reliability and latency requirements for URLLC services cannot be met
Solution Approach 1:
The patent segments the slot into multiple subslots and configures separate PUCCH resources for each subslot. This allows multiple HARQ-ACK feedback instances within a single slot, enabling the system to meet URLLC reliability requirements through diversified feedback opportunities while managing complexity through structured resource allocation.
Solution Approach 2:
The patent introduces dynamic PUCCH resource selection based on subslot boundaries and configurable parameters. The network can dynamically adjust PUCCH resource allocation, timing offsets, and feedback instances according to traffic conditions and URLLC requirements, providing flexibility to meet reliability targets while adapting to varying system states.
2Loss of time
If multiple HARQ-ACK feedback instances are implemented within a slot, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
By dividing the slot into subslots with dedicated PUCCH resources, the patent enables multiple HARQ-ACK feedback instances to be transmitted at different subslot boundaries. This segmentation reduces feedback latency by providing earlier acknowledgment opportunities while the structured subslot-based resource allocation manages the complexity of multiple feedback instances.
Solution Approach 2:
The patent configures PUCCH resources in advance for multiple subslots, pre-establishing the timing and resource allocation for potential HARQ-ACK feedback instances. This preliminary configuration allows the system to quickly activate appropriate feedback instances without real-time decision complexity, reducing latency while managing resource allocation overhead.
3Reliability
If enhanced PUCCH formats with higher transmit power are used, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent enables dynamic transmit power adjustment for PUCCH transmissions based on the selected format and subslot configuration. The UE can adapt power levels according to the specific transmission requirements, using higher power only when necessary for enhanced reliability while conserving energy in scenarios with better channel conditions or less critical transmissions.
Solution Approach 2:
The patent introduces configurable parameters that allow the network to adjust PUCCH transmit power, format selection, and resource allocation based on URLLC requirements. By changing these parameters dynamically, the system can optimize the trade-off between transmission reliability and energy consumption for each specific transmission scenario.
Data Source
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AI summary
A user equipment (UE) is described. The UE includes a higher layer processor configured to determine a physical uplink control channel (PUCCH) resource in a slot or a subslot for HARQ-ACK feedback for ultra-reliable low-latency communication (URLLC) physical downlink shared channel (PDSCH) transmissions. The PUCCH resource is specified as an enhanced PUCCH format configured to satisfy URLLC PUCCH reliability requirements. The UE also includes transmitting circuitry configured to transmit the HARQ-ACK feedback for the URLLC PDSCH transmissions based on the determined PUCCH resource.