PUCCH Prioritization for Simultaneous UCI Transmissions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing simultaneous transmissions of multiple uplink control information (UCI) channels, particularly in scenarios involving hybrid automatic repeat request (HARQ) feedback, leading to overlapping and inefficient resource utilization.
Innovation Solution
The proposed solution involves prioritization and multiplexing of UCI transmissions using prioritization rules and multiplexing techniques, allowing for non-overlapping multi-slot and single-slot PUCCH resources, thereby optimizing resource allocation and reducing conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple UCI transmissions are scheduled on overlapping PUCCH resources, then the system can support multiple control information types, but resource conflicts and interference occur
Solution Approach 1:
The PUCCH resources are segmented into different types (first type and second type) with distinct characteristics. The first type supports both HARQ-ACK and CSI, while the second type is dedicated to HARQ-ACK only. This segmentation allows the system to handle multiple control information types without resource conflicts by assigning appropriate resource types to different UCI combinations.
Solution Approach 2:
Different priority rules are applied locally depending on the UCI composition and PUCCH resource type. When a first type PUCCH resource is used, HARQ-ACK is given higher priority than CSI. When a second type PUCCH resource is used, HARQ-ACK is the only allowed UCI. This local quality approach ensures optimal resource utilization and minimizes interference for each specific transmission scenario.
2Loss of information
If PUCCH resources are allocated for both HARQ-ACK and CSI, then comprehensive control information can be transmitted, but resource allocation complexity increases
Solution Approach 1:
The system segments PUCCH resources into two distinct types with clearly defined capabilities. The first type can carry both HARQ-ACK and CSI, while the second type carries only HARQ-ACK. This segmentation simplifies the resource allocation process by providing clear rules for selecting appropriate resources based on the UCI composition, reducing allocation complexity while maintaining transmission completeness.
Solution Approach 2:
The first type PUCCH resource is designed with multi-functionality to handle both HARQ-ACK and CSI transmissions. This universal resource type reduces the need for multiple specialized resources, thereby simplifying overall resource management while ensuring that comprehensive control information can be transmitted when needed.
3Reliability
If multi-slot PUCCH resources are used, then transmission reliability is improved, but resource occupation time increases
Solution Approach 1:
The system dynamically selects between single-slot and multi-slot PUCCH resources based on the specific transmission requirements and channel conditions. When high reliability is needed and time permits, multi-slot resources are used. When time is constrained or reliability requirements are lower, single-slot resources are selected. This dynamic approach optimizes the trade-off between reliability and resource occupation time for each transmission instance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first indication to transmit first uplink control information (UCI) on a first physical uplink control channel (PUCCH) resource and a second indication to transmit second UCI on a second PUCCH resource. The first PUCCH resource and/or the second PUCCH resource may be a multi-slot PUCCH resource. The UE may receive control signals that schedule a transmission of one or more other UCIs on a set of PUCCH resources in the slot. The UE may perform UCI prioritization for the first PUCCH resource and the set of PUCCH resources in accordance with a set of prioritization rules. The UE may transmit at least the first UCI and the second UCI in the slot based at least in part on the prioritization. Numerous other aspects are described.