PUCCH Resource Selection for URLLC HARQ-ACK Feedback
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Solution Overview
Problem
Current frameworks for HARQ feedback bit transmission in mobile communications are not suitable for ultra-reliable and low-latency communications (URLLC), as they do not differentiate between service types effectively, leading to increased latency and varying reliability requirements for different service types like eMBB and URLLC.
Innovation Solution
A method where user equipment (UE) determines the service type from DCI and selects a PUCCH resource accordingly, allowing for adaptive HARQ-ACK information transmission to meet specific latency and reliability requirements by using service-specific RNTIs, PDCCH search spaces, and payload sizes, thereby preventing multiplexing of URLLC and eMBB HARQ feedback bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PUCCH resource is used for HARQ feedback transmission, then device complexity is reduced, but latency increases for URLLC services
Solution Approach 1:
The patent segments PUCCH resources into service-specific groups (eMBB and URLLC) with different configurations. URLLC services are assigned dedicated PUCCH resources with shorter transmission durations and different timing requirements, separating them from eMBB resources. This segmentation allows URLLC to use optimized resources that reduce latency without affecting overall system complexity.
Solution Approach 2:
The patent implements dynamic PUCCH resource selection based on service type identification. The UE determines whether to use eMBB or URLLC PUCCH resources dynamically according to the service type of the received DCI, allowing the system to adapt resource allocation in real-time rather than using fixed single-resource configuration.
2Productivity
If HARQ feedback multiplexing is used, then spectral efficiency improves, but reliability decreases for URLLC services
Solution Approach 1:
The patent segments HARQ feedback transmission into separate channels based on service type. URLLC HARQ feedback is transmitted on dedicated URLLC PUCCH resources, separated from eMBB HARQ feedback. This prevents multiplexing of different service types and ensures URLLC achieves the required control reliability of 10^-6 BLER while eMBB can utilize multiplexing for spectral efficiency.
Solution Approach 2:
The patent applies different transmission qualities to different service types locally. URLLC HARQ feedback uses more robust transmission parameters (different PUCCH formats, longer durations, separate resources) compared to eMBB, allowing each service type to have optimized quality appropriate to its requirements rather than using a uniform approach.
3Reliability
If service-specific PUCCH resources are allocated, then reliability for different service types improves, but device complexity increases
Solution Approach 1:
The patent implements a universal PUCCH resource configuration framework that handles multiple service types through a single unified mechanism. The network configures both eMBB and URLLC PUCCH resources using the same RRC signaling procedures and resource indication methods (PARI fields in DCI), allowing the system to support service-specific reliability requirements through a universal resource management approach rather than requiring separate complex management systems.
Data Source
AI summary
Various solutions for reporting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for different service types with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive downlink control information (DCI). The apparatus may determine a service type according to the DCI. The apparatus may select a physical uplink control channel (PUCCH) resource according to the service type. The apparatus may transmit HARQ-ACK information in the PUCCH resource.