Terminal CG-UCI Mode Switching for Unlicensed-Band Interference
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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, leading to increased delays and resource inefficiencies.
Innovation Solution
A communication system that includes a terminal and base station configuration to determine and optimize the content of uplink control information (CG-UCI) based on parameters related to the unlicensed band, using reduced and unreduced modes to adapt to different radio environments, reducing the number of bits in CG-UCI parameters such as HARQ process numbers and retransmission parameters when necessary, and employing dynamic or semi-static signaling for mode selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted in unlicensed band with full parameters, then transmission reliability is maintained, but transmission efficiency deteriorates due to increased overhead and resource usage
Solution Approach 1:
The patent applies dynamics by enabling the terminal to switch between reduced mode and unreduced mode for transmitting uplink control information based on real-time radio environment assessment. The terminal dynamically determines the transmission mode by evaluating interference levels and LBT failure risks, thereby optimizing the balance between transmission reliability and efficiency under varying conditions.
Solution Approach 2:
The patent changes the parameter of control information structure by implementing two distinct modes: reduced mode with fewer bits for HARQ process numbers and retransmission parameters, and unreduced mode with full parameters. This parameter change allows the system to adapt the amount of control information transmitted based on the radio environment, resolving the contradiction between reliability and efficiency.
2Productivity
If reduced mode is used to reduce overhead, then transmission efficiency improves, but transmission reliability may deteriorate due to fewer bits transmitted
Solution Approach 1:
The patent implements feedback mechanisms where the terminal reports its transmission status and the base station provides feedback about the radio environment quality. This feedback loop enables the system to monitor whether reduced mode transmission maintains sufficient reliability and switch to unreduced mode when reliability deteriorates, thus resolving the contradiction between efficiency and reliability.
3Device complexity
If fixed transmission mode is used, then device complexity is reduced, but adaptability to varying radio environments deteriorates
Solution Approach 1:
The patent applies dynamics by enabling the terminal to switch between reduced mode and unreduced mode for transmitting uplink control information based on real-time radio environment assessment. The terminal dynamically determines the transmission mode by evaluating interference levels and LBT failure risks, thereby optimizing the balance between transmission reliability and efficiency under varying conditions.
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.