Uplink Channel Selection for Overlapping UCI Timing Constraints
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Solution Overview
Problem
In the NR standard Rel-15 and Rel-16, multiplexing uplink control information (UCI) to a physical uplink control channel (PUCCH) results in increased feedback delay or reduced transmission reliability due to overlapping channels and large UCI capacity, particularly in ultra-reliable low latency communication (URLLC) services with bursty data packet generation.
Innovation Solution
A method and apparatus for a terminal device to determine a specific uplink channel that meets timing constraints and transmit uplink information through a designated channel, ensuring non-overlapping channels and reducing feedback delay and improving reliability by limiting multiplexing to a single channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all UCI information is multiplexed to a PUCCH resource for transmission, then transmission reliability is improved, but feedback delay increases
Solution Approach 1:
The patent segments the multiplexing process by introducing a determination step that divides UCI transmission into two paths: (1) multiplexing to PUCCH when timing constraints are satisfied, and (2) dropping PUCCH and transmitting only on PUSCH when timing constraints are not satisfied. This segmentation allows the system to choose the appropriate transmission method based on timing conditions, thereby reducing feedback delay while maintaining reliability when possible.
Solution Approach 2:
The patent implements dynamic decision-making by introducing a determination step that evaluates timing constraints before multiplexing. The system dynamically adjusts the transmission strategy based on whether the timing constraint between the PUCCH resource and the earliest PUSCH is satisfied, allowing flexible adaptation between multiplexing and non-multiplexing scenarios to optimize both reliability and feedback delay.
2Reliability
If all UCI information is multiplexed to a PUCCH resource for transmission, then transmission reliability is improved, but UCI information capacity becomes large affecting reliability
Solution Approach 1:
The patent applies partial action by selectively multiplexing only when timing constraints are satisfied. When the timing constraint is not met, the system performs partial transmission by dropping the PUCCH and transmitting UCI information only through PUSCH, avoiding the problem of large UCI capacity accumulation that would occur with full multiplexing in all scenarios.
Solution Approach 2:
The patent extracts the timing constraint evaluation as a separate determination step before multiplexing. This extraction allows the system to identify and handle cases where multiplexing would create excessive UCI capacity, by taking out these cases from the multiplexing process and handling them separately through PUSCH-only transmission.
3Loss of time
If sub-slot based PUCCH is used to meet latency requirements, then feedback delay is reduced, but UCI information capacity becomes large affecting reliability
Solution Approach 1:
The patent implements dynamic control by introducing a timing constraint determination step that evaluates whether sub-slot based PUCCH multiplexing is appropriate. The system dynamically switches between using sub-slot PUCCH (when timing constraints are satisfied) and dropping PUCCH in favor of PUSCH transmission (when timing constraints are not satisfied), thereby managing UCI capacity while maintaining reliability.
Solution Approach 2:
The patent changes the transmission parameter strategy by introducing a conditional approach: when the timing constraint is satisfied, it uses sub-slot based PUCCH with reduced feedback delay; when the timing constraint is not satisfied, it changes to PUSCH-only transmission to avoid excessive UCI capacity. This parameter change based on timing conditions resolves the contradiction between feedback delay and reliability.
Data Source
AI summary
Embodiments of the present application provide an information transmission method and apparatus, and devices. The method includes: when a first uplink channel and multiple second uplink channels overlap in a time domain and the multiple second uplink channels include at least one third uplink channel, a terminal device transmits first uplink information through a fifth uplink channel if the at least one third uplink channel includes a fourth uplink channel, where the third uplink channel corresponds to at least one DCI, the fourth uplink channel and the first uplink channel meet a first timing constraint, the fifth uplink channel has a first relationship with the fourth uplink channel or the fifth uplink channel is obtained through the fourth uplink channel, and the multiple second uplink channels do not overlap each other in the time domain.