Uplink Control Channel Priority Handling in 5G NR Terminals
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Solution Overview
Problem
The conventional method of transmitting uplink control information in 3GPP New Radio (NR) systems is inefficient, leading to degraded communication efficiency, particularly in the handling of scheduling requests (SR) and channel state information (CSI), due to repetitive transmission and multiplexing of different types of uplink control information.
Innovation Solution
A method where a terminal receives information on resource allocation and priorities for SRs from a base station, compares priorities, and transmits only higher-priority SRs, adjusting repeated transmission counters and transmission powers accordingly, while also determining the number of repeated transmissions based on traffic type and format, and frequency-hopping SRs within or across slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is repeatedly transmitted to ensure reliability, then transmission reliability is improved, but transmission efficiency deteriorates due to increased resource consumption
Solution Approach 1:
The patent applies partial action by transmitting uplink control information only the necessary number of times based on priority levels and overlap conditions, rather than uniformly repeating all transmissions. High-priority UCIs are transmitted fully while low-priority UCIs are selectively dropped when conflicts occur, achieving reliable transmission of critical information without excessive resource consumption.
2Productivity
If multiple types of uplink control information are multiplexed in the same slot to improve resource utilization, then resource efficiency is improved, but transmission complexity increases
Solution Approach 1:
The patent applies local quality by assigning different priority levels and transmission rules to different types of uplink control information based on their specific requirements. HARQ-ACK and scheduling requests receive higher priority with guaranteed transmission, while other UCIs are transmitted only when resources are available, creating differentiated transmission quality for different information types.
3Reliability
If uplink control channel resources are allocated to ensure all scheduling requests can be transmitted, then transmission completeness is improved, but resource consumption increases
Solution Approach 1:
The patent extracts and prioritizes critical uplink control information for guaranteed transmission while allowing non-critical information to be dropped when resource conflicts occur. By separating UCIs into priority tiers, the system ensures essential control signals are transmitted completely without allocating resources for all possible transmissions.
4Ease of operation
If the terminal derives UL control channel resource index based on DL control channel to simplify resource allocation, then allocation simplicity is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic resource allocation where the terminal can select from multiple UL control channel resource indices based on priority levels and transmission conditions, rather than using a fixed derivation method. This dynamic selection enables efficient resource utilization while maintaining operational simplicity through standardized selection criteria.
Data Source
AI summary
A method for transmitting an uplink control channel by a terminal may comprise the steps of: receiving, from a base station, information on resources for transmitting a first SR and a second SR; when the symbols of a first uplink control channel including the first SR partially or completely overlap the symbols of a second uplink control channel including the second SR, comparing the priority of the first SR and the priority of the second SR; and when the priority of the second SR is higher than the priority of the first SR, transmitting the second uplink control channel without transmitting some or all of the symbols of the first uplink control channel.