Terminal CG-UCI Content Switching for Unlicensed-Band Reliability
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Solution Overview
Problem
Existing methods for transmitting uplink control information in unlicensed frequency bands face challenges in maintaining reliability and efficiency due to interference and LBT failures, which affect the transmission of configured grant uplink control information (CG-UCI) in New Radio (NR) systems.
Innovation Solution
A terminal and communication method that dynamically adjust the content of CG-UCI based on parameters related to the unlicensed band, such as HARQ process number and retransmission parameters, to optimize transmission efficiency and reliability by reducing the number of bits in CG-UCI through mode switching and parameter determination methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits complete CG-UCI with all HARQ process numbers and retransmission parameters, then the reliability of control information transmission is improved, but the transmission efficiency deteriorates due to increased resource usage and longer transmission time
Solution Approach 1:
The patent applies dynamics by making the CG-UCI transmission adaptive rather than static. The terminal dynamically determines whether to transmit complete CG-UCI or reduced CG-UCI based on real-time conditions including LBT success status, HARQ process number, and retransmission parameters. This dynamic adjustment allows the system to optimize between reliability and transmission efficiency based on actual transmission circumstances.
Solution Approach 2:
The patent changes the parameter of CG-UCI content based on transmission conditions. When LBT is successful and certain conditions are met, the terminal transmits reduced CG-UCI with fewer bits. When LBT fails or specific HARQ process numbers are detected, the terminal transmits complete CG-UCI. This parameter change strategy resolves the contradiction by adjusting information quantity according to actual needs.
2Productivity
If the terminal uses reduced CG-UCI to improve transmission efficiency, then the resource usage is reduced, but the reliability of control information transmission may deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the terminal monitors LBT status, HARQ process numbers, and retransmission parameters to determine when to use reduced CG-UCI versus complete CG-UCI. The base station also provides feedback through downlink control information indicating whether reduced CG-UCI should be used. This feedback loop ensures that reliability is maintained while maximizing transmission efficiency through appropriate CG-UCI selection.
Solution Approach 2:
The system changes the CG-UCI parameter (content completeness) based on transmission conditions. The terminal adjusts the CG-UCI from complete to reduced form depending on LBT success, HARQ process number, and retransmission status. This parameter adaptation allows the system to achieve both efficiency and reliability by selecting the appropriate level of detail based on actual transmission needs.
3Adaptability or versatility
If the terminal transmits CG-UCI in unlicensed band, then the communication coverage is expanded, but the transmission reliability deteriorates due to interference and LBT failures
Solution Approach 1:
The patent makes the CG-UCI transmission dynamic by adjusting content based on real-time LBT status and interference conditions. When LBT fails or high interference is detected in the unlicensed band, the terminal uses reduced CG-UCI to minimize transmission time and reduce exposure to interference. When conditions are favorable, complete CG-UCI is transmitted. This dynamic approach maintains reliability while expanding coverage.
Solution Approach 2:
The patent converts the harmful effect of LBT failures and interference into a benefit by using these conditions as triggers for reduced CG-UCI transmission. Instead of persisting with complete CG-UCI that fails frequently in unlicensed bands, the system leverages LBT failure information and interference conditions to switch to reduced CG-UCI, thereby improving overall transmission reliability while maintaining unlicensed band coverage.
Data Source
AI summary
This terminal comprises a reception circuit that receives parameters pertaining to a license-exempt band, and a control circuit that determines information included in uplink control information on the basis of the parameters.