Uplink Control Information Notification via Code Resource Mapping
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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 use of legacy LTE systems' UCI transmission methods, which can deteriorate performance in terms of coverage and throughput.
Innovation Solution
A user terminal that transmits uplink signals using a code resource associated with uplink control information and controls the determination of transmission resources, including time, frequency, and code resources, based on indication information from a radio base station, allowing for appropriate notification of UL control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy LTE systems' UCI transmission method is used, then compatibility with existing systems is maintained, but coverage and throughput deteriorate
Solution Approach 1:
The patent changes the transmission parameters by mapping UCI values to different code resources (sequence indices, cyclic shifts, orthogonal cover codes) instead of using legacy PUCCH formats. This allows optimized resource allocation that improves coverage and throughput while maintaining system compatibility through the same basic uplink control channel structure.
Solution Approach 2:
The patent introduces dynamic resource allocation where the code resource is selected based on the actual UCI value to be transmitted. This dynamic mapping allows the system to adapt to different channel conditions and traffic requirements, improving overall system performance while maintaining backward compatibility.
2Productivity
If legacy LTE UCI transmission method is used, then existing infrastructure is utilized, but throughput decreases
Solution Approach 1:
The patent implements self-service through automatic code resource selection based on UCI value mapping. The system automatically determines the appropriate code resource without requiring complex manual configuration or additional signaling overhead, thereby improving throughput while keeping the resource allocation mechanism relatively simple.
3Measurement precision
If code resource associated with UCI value is used, then notification accuracy improves, but resource management complexity increases
Solution Approach 1:
The patent uses the code resource (sequence, cyclic shift, or orthogonal cover code) as an intermediary that carries the UCI information. This intermediary approach allows accurate notification of UCI values while managing complexity by using well-established spreading code techniques that are already integrated into the OFDMA framework of LTE and 5G systems.
Data Source
AI summary
To appropriately notify UL control information in a future radio communication system, a user terminal includes: a transmitting section that transmits an uplink signal by using a code resource associated with a value of uplink control information; and a control section that controls determination of at least one transmission resource of a time resource, a frequency resource and the code resource used for the uplink signal based on indication information that is notified from a radio base station and indicates at least one resource of the time resource, the frequency resource and the code resource.