Multi-Cell HARQ-ACK Feedback on Shared PUCCH Resources
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Solution Overview
Problem
The capacity of NR PDCCHs is affected in carriers where LTE and NR coexist due to the inability to use resources where LTE cell reference signals and physical uplink control channels are located, necessitating a new mechanism to address this capacity issue.
Innovation Solution
A terminal device receives a DCI to schedule PDSCHs of multiple serving cells, dividing them into PUCCH groups for HARQ-ACK feedback on a single PUCCH resource, optimizing the timing and resource allocation to minimize feedback delay and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources where LTE cell reference signals and physical uplink control channels are located are reserved for LTE systems, then LTE system reliability is improved, but NR PDCCH capacity deteriorates
Solution Approach 1:
The patent segments the PUCCH feedback resources into multiple groups (first PUCCH group and second PUCCH group) that can be independently configured and managed. This segmentation allows the system to organize PUCCH resources more efficiently, enabling better utilization of available uplink resources for NR PDCCH feedback without interfering with LTE resource reservations, thereby improving NR PDCCH capacity while maintaining LTE reliability.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where PUCCH resource groups and their associated parameters can be flexibly adjusted based on network conditions and traffic requirements. This dynamic approach allows the system to optimize resource allocation in real-time, maximizing NR PDCCH capacity utilization while ensuring LTE resources remain protected when needed.
2Loss of substance
If multiple PDSCHs are scheduled by single DCI, then DCI overhead is reduced, but scheduling complexity increases
Solution Approach 1:
The patent merges multiple PDSCH scheduling operations into a single DCI message by introducing a unified PUCCH resource indication mechanism. This merging approach allows one DCI to coordinate feedback for multiple scheduled PDSCHs across different serving cells, significantly reducing DCI overhead. The complexity is managed through standardized grouping rules and configuration parameters that simplify the scheduling logic.
Solution Approach 2:
The patent creates a universal PUCCH resource indication field in the DCI that can serve multiple PDSCHs simultaneously. This multi-functional indicator can reference different PUCCH resource groups depending on the scheduling configuration, allowing the same DCI structure to handle various scheduling scenarios (single cell, multi-cell, cross-carrier) without increasing complexity proportionally.
3Productivity
If PUCCH resources are shared across multiple serving cells, then resource utilization rate is improved, but feedback reliability deteriorates
Solution Approach 1:
The patent segments PUCCH resources into distinct groups (first PUCCH group with first resources, second PUCCH group with second resources) that can be independently configured and protected. This segmentation allows the system to share resources efficiently across multiple serving cells while maintaining isolated protection mechanisms for each group, ensuring that feedback reliability is preserved even as utilization rate improves through sharing.
Solution Approach 2:
The patent applies local quality optimization by configuring different PUCCH resource groups with different characteristics (e.g., different time-frequency resources, different modulation schemes) suited for specific serving cells or traffic types. This allows each local PUCCH group to be optimized for its specific requirements while contributing to overall resource utilization, maintaining reliability through localized optimization rather than uniform sharing.
Data Source
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AI summary
Implementations of the disclosure provide a method for uplink transmission, a terminal device, and a network device. The method includes the following. A terminal device receives a downlink control information (DCI) from a network device, where the DCI is used to schedule physical downlink shared channels (PDSCHs) of at least two serving cells. The terminal device transmits hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information corresponding to the PDSCHs of the at least two serving cells on a first physical uplink control channel (PUCCH) resource. With the disclosure, the utilization of resources can be improved and the overhead of the DCI can be reduced.