UCI Multiplexing on FDM Repetitions for Reliable Uplink Control
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Solution Overview
Problem
Wireless communications systems lack mechanisms for user equipment (UE) to determine whether to transmit uplink control information (UCI) via single or multiple frequency division multiplexed (FDM) repetitions, and to select the appropriate repetition when instructed to use both.
Innovation Solution
The UE determines whether to transmit UCI via a single or multiple repetitions based on conditions such as explicit signaling from the network, type of UCI, and conditions like sounding reference (SRS), redundancy version (RV), and frequency range, defaulting to a single repetition if conditions are not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits UCI via multiple FDM repetitions, then the reliability of control information transmission is improved, but the device complexity increases due to the need to determine which repetition to use and manage multiple transmission paths
Solution Approach 1:
The patent implements dynamic selection of UCI transmission repetition based on real-time channel conditions and network configuration. The UE dynamically determines whether to transmit UCI on the first repetition, second repetition, or both repetitions by evaluating conditions such as RRC configuration, DCI indications, and channel quality metrics, thereby adapting the transmission strategy to current system state while maintaining reliability without excessive complexity
Solution Approach 2:
The patent segments the UCI transmission decision into distinct cases: transmitting on first repetition only, second repetition only, or both repetitions. This segmentation is achieved through structured evaluation of multiple conditions (RRC configuration, DCI format, channel quality) that lead to discrete transmission decisions, making the complex problem manageable through systematic case analysis
2Device complexity
If the UE transmits UCI via a single repetition, then the device complexity is reduced, but the reliability of control information transmission deteriorates
Solution Approach 1:
The patent enables the UE to autonomously determine the appropriate repetition strategy by self-evaluating channel conditions, configuration parameters, and transmission requirements. The UE independently decides whether to use single or multiple repetitions based on pre-configured rules and real-time measurements, eliminating the need for complex network-side control while maintaining transmission reliability through intelligent local decision-making
3Ease of operation
If the network provides explicit signaling for UCI repetition selection, then the ease of operation is improved, but the loss of time increases due to additional signaling overhead
Solution Approach 1:
The patent implements preliminary configuration through RRC signaling that pre-establishesthe rules and parameters for UCI repetition selection before actual transmission occurs. The network configures condition thresholds, repetition patterns, and selection criteria in advance, so that during real-time operation, the UE can quickly evaluate pre-defined conditions and make transmission decisions without extensive real-time signaling exchange, reducing latency while maintaining ease of operation
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Described techniques provide for procedures, conditions, and signaling, based on which a user equipment (UE) may determine whether to transmit uplink control information (UCI) via a single repetition or multiple repetitions when two frequency division multiplexed (FDM) repetitions are scheduled for a UE. For example, the network may indicate that the UE is to adopt a first behavior (e.g., transmit UCI via a single repetition) or a second behavior (e.g., transmit UCI via both repetitions). If the UE is configured to transmit the UCI via both repetitions, then the UE may determine if one or more conditions are satisfied. If such conditions are not met, then the UE may default to the first behavior. The UE may determine which behavior to apply based on explicit signaling from the network, a type of UCI, or a combination thereof.