Uplink Control Information Transmission via Sequence and DMRS Modes
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Solution Overview
Problem
Future radio communication systems, such as 5G and NR, face challenges in maintaining coverage and throughput due to the application of existing LTE systems' UL control channel methods, which may deteriorate performance in terms of ultra-high speed, large capacity, and ultra-low latency requirements.
Innovation Solution
A user terminal and radio communication method that employs DMRS-based and sequence-based transmission schemes for UL control information, allowing for efficient use of time/frequency resources and reducing signaling overhead by configuring common resources for multiple UEs, thereby enhancing spectral efficiency and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing LTE UL control channel methods are applied to future radio communication systems, then compatibility with current systems is maintained, but coverage and throughput deteriorate due to inability to meet ultra-high speed, large capacity, and ultra-low latency requirements
Solution Approach 1:
The patent implements dynamic selection between sequence-based transmission and DMRS-based transmission modes based on UCI bit quantity and reliability requirements. The system adapts the transmission scheme in real-time: using sequence-based transmission for small UCI payloads (1-2 bits) and DMRS-based transmission for larger payloads or when higher reliability is needed, thereby resolving the contradiction between maintaining coverage and adapting to future high-speed, large-capacity requirements
Solution Approach 2:
The patent changes key transmission parameters including cyclic shift values, orthogonal cover codes, and resource allocation based on UCI payload size and reliability requirements. By dynamically adjusting these parameters, the system optimizes coverage for small payloads while enabling high throughput for large payloads in future radio communication systems
2Reliability
If separate resource configuration is used for each UE, then individual UE requirements are optimized, but signaling overhead increases
Solution Approach 1:
The patent configures common uplink control channel resources that can be universally used by multiple UEs. The base station allocates shared time-frequency resources and code resources (cyclic shifts, orthogonal cover codes) that serve multiple users, reducing signaling overhead while maintaining the ability to individually optimize each UE's transmission through parameter selection within the shared resource pool
3Productivity
If DMRS-based transmission is used for all UCI, then throughput is improved, but resource efficiency decreases for small UCI payloads
Solution Approach 1:
The patent applies DMRS-based transmission only when necessary (for larger UCI payloads or when high reliability is required), rather than universally. For small UCI payloads (1-2 bits), the system uses more efficient sequence-based transmission without DMRS, thereby avoiding excessive resource usage while maintaining high throughput when needed
4Quantity of substance
If sequence-based transmission is used for all UCI, then resource efficiency is improved, but coverage deteriorates for large UCI payloads
Solution Approach 1:
The system dynamically selects between sequence-based transmission and DMRS-based transmission based on UCI payload size and reliability requirements. For small payloads (1-2 bits), sequence-based transmission provides efficient resource usage. For larger payloads or when higher reliability is needed, the system switches to DMRS-based transmission, thereby resolving the contradiction between resource efficiency and coverage
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3D
AI summary
The present invention is designed so that UL control information can be reported properly in future radio communication systems. A user terminal, according to one aspect of the present invention, has a control section that controls code division multiplexing of a reference signal for demodulating first UL control information and a signal sequence, which uses a sequence that is associated with a value of second UL control information, and a transmission section that transmits a UL signal subject to the code division multiplexing, and the control section controls mapping of a plurality of signal sequences to different frequency resources in different time resources.