Uplink Control Information Channel Access Type Selection
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Solution Overview
Problem
In LTE LAA, uplink transmission in the unlicensed band only supports PUSCHs and not PUCCHs, limiting the transmission of HARQ feedback information and SR to licensed spectra, while NR-U requires independent operation of NR-U cells transmitting all UCI on unlicensed spectra, posing challenges in channel access for PUCCH.
Innovation Solution
A method and apparatus for determining a channel access type for uplink control information (UCI) transmission, which includes not performing channel detection, using a detection interval, or using a detection interval and a contention window, allowing terminal equipment to transmit UCI after channel detection or without detection based on the determined channel access type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel detection is performed before UCI transmission, then reliability is improved and interference is avoided, but transmission latency increases and transmission efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the channel detection process adjustable rather than fixed. The network device can dynamically configure the terminal equipment to perform channel detection only when necessary (e.g., when uplink control information needs to be transmitted on unlicensed spectrum), and skip detection when conditions permit. This dynamic adaptation resolves the contradiction by allowing the system to switch between reliable detection-based transmission and low-latency direct transmission based on real-time requirements.
2Object-affected harmful factors
If channel detection with contention window is performed, then interference avoidance is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent applies local quality by making channel detection optional and location-specific rather than universal. Instead of requiring all UCI transmissions to undergo complex channel detection with contention windows, the system applies detection only in specific local contexts where it is necessary (e.g., when sharing unlicensed spectrum resources). This selective application maintains interference avoidance where needed while preserving operational simplicity elsewhere.
Data Source
AI summary
A terminal device includes: a receiver configured to: receive RRC signaling for configuring one or a plurality of channel access types, the one or the plurality of channel access types including at least one of the following: a first channel access type not performing channel detection, a second channel access type containing a detection interval, a third channel access type containing a detection interval and a contention window, and receive downlink control information (DCI) indicating a channel access type of a Physical Uplink Control Channel (PUCCH) used for transmitting HARQ feedback information from the one or the plurality of channel access types; and a transmitter configured to transmit the PUCCH according to the channel access type of the PUCCH.