UCI Multiplexing Segmentation for Priority HARQ-ACK Coding
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Solution Overview
Problem
The complexity of uplink control information (UCI) multiplexing in 3GPP Release 17 (Rel-17) wireless communication systems is increased due to inter-Layer 1 priority, making it challenging to manage and optimize UCI multiplexing design, especially with the introduction of physical layer priority in Rel-16 and further complications in Rel-17.
Innovation Solution
The proposed solution involves managing UCI multiplexing complexity by considering simultaneous transmission of physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH), inter-priority multiplexing, PHY cancellation of direct and configured grants, hybrid automatic repeat request (HARQ) codebook construction, and physical channel design for PUCCH, including sub-slot repetition and inter-sub-slot repetition, while supporting separate coding for high-priority (HP) and low-priority (LP) HARQ-ACKs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-L1 priority UCI multiplexing is implemented in Rel-17, then the reliability of UCI transmission is improved by supporting separate coding for HP and LP HARQ-ACKs, but the device complexity and design complexity increase significantly
Solution Approach 1:
The UCI multiplexing design is segmented into separate coding paths for high-priority (HP) and low-priority (LP) HARQ-ACKs. Each priority level has its own coding scheme and resource allocation mechanism, allowing independent optimization and simplifying the overall design management by dividing the complex multiplexing problem into manageable segments.
Solution Approach 2:
Different coding strategies and quality parameters are applied locally to different priority levels. HP HARQ-ACKs receive more robust coding and higher allocation priority, while LP HARQ-ACKs use simpler coding. This local differentiation improves overall reliability without requiring uniform complex processing across all UCI types.
2Productivity
If simultaneous PUCCH and PUSCH transmission is supported, then the productivity of UCI transmission is improved by enabling parallel channels, but the device complexity increases due to additional multiplexing management requirements
Solution Approach 1:
The PUCCH and PUSCH channels are merged into a unified multiplexing framework that handles both control and data transmissions simultaneously. The patent defines a common set of rules for resource allocation, coding, and prioritization that apply to both channels, reducing the need for separate management mechanisms and lowering overall system complexity.
Solution Approach 2:
The UCI multiplexing design is made universal by creating a priority-based framework that can accommodate different transmission scenarios (PUCCH only, PUSCH only, or simultaneous PUCCH-PUSCH). The same priority rules and coding strategies apply across all transmission modes, enabling the system to handle multiple functions with a single set of design principles.
Data Source
AI summary
Systems and methods for modularized design for inter-physical layer priority uplink control information (UCI) multiplexing are disclosed herein. A user equipment (UE) may determine a first code rate for a first portion of UCI and a second code rate for a second portion of UCI. Different code rates may be used to encode different portions of UCI (e.g., hybrid automatic repeat request acknowledgement (HARQ-ACK) bits, channel state information (CSI) reporting bits, scheduling request (SR) bits, cyclic redundancy check (CRC) bits, etc.). Further, a UE may select a group of bets offset sets based on a physical layer priority type and a UCI multiplexing type.