PUCCH Resource Multiplexing for Uplink Control Information
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR and LTE, there is a challenge in efficiently multiplexing uplink control information (UCI) on physical uplink control channel (PUCCH) resources due to overlapping configurations for channel state information (CSI) and hybrid automatic repeat request (HARQ) feedback, leading to performance losses and delays in non-ideal backhaul conditions.
Innovation Solution
The method involves determining overlapping PUCCH resources for CSI and HARQ feedback, and multiplexing CSI reports and HARQ feedback using specific PUCCH resources associated with downlink demodulation reference signal (DMRS) port groups, allowing for simultaneous reporting and feedback transmission, while prioritizing HARQ feedback to manage payload size limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PUCCH resources are allocated for CSI reports and HARQ feedback, then reporting reliability is improved, but resource overlap causes transmission conflicts and delays
Solution Approach 1:
The patent combines CSI reports and HARQ feedback into a single multiplexed transmission on PUCCH resources. When resource overlap is detected, the system merges these control information types and transmits them together using priority-based multiplexing, eliminating transmission conflicts while maintaining reporting reliability through structured combination rules.
Solution Approach 2:
The patent implements dynamic resource allocation where PUCCH resources are flexibly assigned based on real-time conditions. The system dynamically determines whether to use separate resources or multiplexed resources depending on overlap detection, payload size, and priority levels, allowing adaptive response to changing transmission requirements and reducing delays.
2Measurement precision
If PUCCH resources for CSI and HARQ are configured separately, then control information accuracy is improved, but payload size limitations cause transmission failures
Solution Approach 1:
The patent segments control information into priority levels and types (CSI and HARQ), assigning different priority values to each. This segmentation allows the system to handle payload size limitations by prioritizing critical information (HARQ feedback with higher priority) while still transmitting lower-priority CSI reports within the same multiplexed resource, maintaining accuracy without sacrificing transmission efficiency.
Solution Approach 2:
The patent changes the parameter of resource allocation from fixed separate allocation to flexible multiplexed allocation based on payload size and priority. By adjusting resource assignment parameters dynamically according to actual transmission needs, the system overcomes payload limitations while preserving control information accuracy through structured multiplexing rules.
3Productivity
If overlapping PUCCH resources are used for multiplexing, then resource utilization is improved, but complexity of resource management increases
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously determines resource overlap, selects appropriate multiplexing strategies, and manages its own control information transmission without complex network coordination. The network provides simple configuration parameters, and the UE independently handles the complex resource management decisions, reducing overall system complexity while improving utilization.
4Reliability
If priority-based multiplexing is implemented, then transmission reliability is improved, but processing complexity at UE increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority levels and multiplexing rules before actual transmission occurs. The network provides advance configuration of priority parameters and multiplexing strategies, allowing the UE to perform simpler runtime decisions based on pre-established rules rather than complex real-time analysis, thus improving reliability while limiting processing complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for multiplexing uplink control information (UCI) on physical uplink control channel (PUCCH) resources for non-ideal backhaul based multi-transmission/reception point non-coherent joint transmissions. An example method generally includes determining that a first set of physical uplink control channel (PUCCH) resources configured for reporting channel state information (CSI) overlaps with a second set of PUCCH resources indicated for reporting hybrid automatic repeat request (HARQ) feedback, wherein the first and second sets of PUCCH resources are associated with downlink demodulation reference signal (DMRS) port groups, generating CSI reports and HARQ feedback associated with at least one of the downlink DMRS port groups, and transmitting the CSI reports and the HARQ feedback, multiplexed using the second set of PUCCH resources.