PUSCH Selection for UCI Transmission in NR Systems
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Solution Overview
Problem
In the LTE and NR communication systems, the existing methods for selecting Physical Uplink Shared Channels (PUSCH) to carry Uplink Control Information (UCI) are not suitable for the New Radio's flexible frame structure and numerologies, leading to increased processing complexity and peak-to-average ratio, especially in Ultra-Reliable Low Latency Communication (URLLC) services.
Innovation Solution
A method is provided for a User Equipment (UE) to select the best PUSCH to carry UCI based on uplink data scheduling type and numerology, reducing processing delay and peak-to-average ratio by determining overlap between PUCCH and PUSCH and selecting an appropriate PUSCH for UCI transmission, thereby improving transmission reliability and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the LTE carrier selection technique is applied in NR system, then the implementation is simple, but the processing complexity increases and peak-to-average ratio increases
Solution Approach 1:
The patent changes the selection parameters from simple carrier index (LTE approach) to multiple parameters including scheduling type, numerology, and timing relationships (NR approach). This allows the system to adapt to different service requirements and reduces processing complexity by providing clear selection criteria based on these parameters.
Solution Approach 2:
The patent introduces dynamic selection criteria that adapt to different scheduling types (grant-based vs. grant-free) and numerologies. The PUSCH selection is no longer static based on carrier index but dynamically adjusts based on the specific service requirements and channel conditions, reducing peak-to-average ratio.
2Quantity of substance
If multiple PUSCH transmissions are multiplexed with UCI, then transmission capacity increases, but processing delay increases
Solution Approach 1:
The patent segments the PUSCH transmission into different categories based on scheduling type and numerology. By dividing the selection into distinct cases (grant-based with different numerologies, grant-free transmissions), the system can efficiently manage multiple PUSCH transmissions without excessive processing delay, as each segment has predefined selection rules.
Solution Approach 2:
The patent establishes preliminary selection criteria before actual UCI multiplexing occurs. By pre-defining the selection rules based on scheduling type and numerology, the UE can quickly determine which PUSCH to use without complex real-time processing, thus maintaining low processing delay while supporting multiple transmissions.
3Productivity
If UCI is multiplexed in grant-free PUSCH, then resource utilization improves, but URLLC service reliability deteriorates
Solution Approach 1:
The patent applies different quality requirements to different PUSCH types. Grant-free PUSCH used for URLLC services is given special protection by excluding it from UCI multiplexing, while other PUSCH transmissions can utilize UCI multiplexing. This local differentiation ensures URLLC reliability is maintained while resource utilization is improved in other scenarios.
Solution Approach 2:
The patent introduces scheduling type and numerology as intermediary criteria that mediate between resource utilization and reliability requirements. These intermediaries enable the system to distinguish between different service types and apply appropriate UCI multiplexing rules, thereby protecting URLLC services while allowing efficient resource use for other services.
4Speed
If simple carrier index selection is used, then selection process is fast, but transmission reliability decreases
Solution Approach 1:
The patent performs preliminary classification of PUSCH transmissions based on scheduling type and numerology before selection. This preliminary action organizes the selection space in advance, allowing fast selection within each category while ensuring reliable transmission by considering the specific characteristics of each PUSCH type in the selection criteria.
Solution Approach 2:
The patent changes the selection parameters from simple carrier index to a multi-parameter system including scheduling type, numerology, and timing relationships. While this increases the apparent complexity, it actually improves reliability by considering relevant transmission characteristics, and maintains speed through structured decision rules for each parameter combination.
Data Source
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AI summary
A method of sending UCI and a user equipment are provided. The method includes: in the case that an overlapping of PUCCH and PUSCH in a time domain occurs, selecting a PUSCH to carry and send UCI, based on at least one of an uplink data scheduling type and a numerology of uplink carrier.