UCI Multiplexing Start Position for Low-Latency PUSCH Scheduling
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Solution Overview
Problem
The challenge in advanced mobile communication technologies, such as 6G, is the need to reduce UE processing timelines for uplink control information (UCI) multiplexing to meet stringent hard-real-time processing requirements, particularly in scenarios involving multiple component carriers and aperiodic channel state information reporting.
Innovation Solution
The proposed schemes involve determining the symbol position for UCI multiplexing on physical uplink shared channel (PUSCH) based on dynamic signaling, UE processing timelines, and demodulation reference signal (DMRS) symbols, ensuring robustness and compliance with timing constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE processing timelines are reduced to meet lower scheduling and retransmission latencies in 6G, then productivity is improved, but reliability deteriorates due to tighter timing constraints on UCI multiplexing
Solution Approach 1:
The patent applies dynamics by making the UCI multiplexing symbol position flexible rather than fixed. The starting symbol position is determined dynamically based on the latest of multiple timing constraints (N1, N2, Z, Z′), allowing the system to adapt to different processing capabilities and traffic conditions while meeting the reduced latency requirements of 6G
Solution Approach 2:
The patent changes the parameter of UCI multiplexing timing by introducing multiple reference points (N1, N2, Z, Z′) and selecting the latest one as the actual starting position. This parameter adjustment allows the system to maintain reliability under tighter latency constraints by ensuring sufficient processing time while still achieving lower overall latency through optimized scheduling
2Productivity
If multiple component carriers are scheduled within the same HRT processing requirements, then productivity is improved, but device complexity increases due to multiple timing constraints
Solution Approach 1:
The patent applies universality by creating a unified timing constraint framework that handles multiple component carriers and different UCI types (HARQ feedback, CSI reports) through a single determination rule. The same principle of selecting the latest timing constraint applies universally across all carriers and UCI types, simplifying the overall system design while maintaining the ability to handle complex multi-carrier scenarios
Solution Approach 2:
The patent segments the timing constraint management by separating the determination of UCI multiplexing start position into distinct reference points (N1 for PDSCH decoding, N2 for PUSCH preparation, Z for CSI computation, Z′ for HARQ feedback). This segmentation allows each constraint to be evaluated independently while the final start position is determined by taking the latest of these segmented constraints
Data Source
AI summary
Various solutions for enhanced uplink control information (UCI) multiplexing in mobile communications are described. An apparatus may receive a downlink control information (DCI) from a network node. The DCI schedules one or more physical uplink shared channels (PUSCHs). The apparatus may multiplex UCI to one of the PUSCHs carrying uplink shared channel (UL-SCH) data. The multiplexing starts from a symbol position determined according to at least one of the following: a dynamic signaling comprising an indication of the symbol position; one or more user equipment (UE) processing timelines for reporting the UCI; and a position of a demodulation reference signal (DMRS) symbol configured by the DCI. Then, the apparatus may transmit the PUSCHs to the network node.