Unlicensed Spectrum Access via Remaining Channel Occupancy Duration
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Solution Overview
Problem
In new radio-based access to unlicensed spectrums (NRU) communication, there is a need for a method to indicate the outcome of the listen before talk (LBT) procedure, which is crucial for ensuring fair use of unlicensed spectrums and preventing transmission conflicts.
Innovation Solution
A communication method is provided where a user equipment (UE) or network node determines the remaining channel occupancy duration (RCOD) based on information received from a base station, using a configuration message with a duration candidate list and a control message with a channel occupancy duration field, allowing the UE or network node to access unlicensed spectrums reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-RB set-based LBT procedure is performed before transmissions of multiple RB sets, then the channel access compliance is improved, but the transmission efficiency deteriorates when the outcome is undeterminable
Solution Approach 1:
The patent segments the channel access procedure into two parts: a simplified LBT that can be performed independently for each RB set, and a coordination mechanism that manages multiple RB sets. This allows the UE to proceed with transmissions even when the outcome for all RB sets is not fully determinable, improving transmission efficiency while maintaining compliance through the simplified per-RB-set LBT approach
Solution Approach 2:
The patent applies preliminary action by performing a simplified LBT procedure in advance for each RB set before transmission, rather than waiting for complete channel assessment. This preliminary channel check allows the UE to prepare and potentially transmit on individual RB sets that pass the simplified LBT, improving efficiency while maintaining regulatory compliance
2Reliability
If the UE waits for a determinable outcome of the multi-RB set based LBT procedure, then the channel access reliability is improved, but the transmission delay increases
Solution Approach 1:
The patent introduces dynamic behavior where the UE can adapt its transmission strategy based on the LBT outcome for each individual RB set. Instead of waiting for a static, all-or-nothing determination, the UE dynamically decides which RB sets to transmit on based on their individual channel access outcomes, reducing transmission delay while maintaining reliability through case-by-case assessment
3Productivity
If the UE performs simplified LBT for each RB set independently, then the transmission efficiency is improved, but the channel access compliance may be compromised
Solution Approach 1:
The patent introduces an intermediary coordination mechanism that manages the relationship between independent per-RB-set LBT procedures and overall channel access compliance. This intermediary layer ensures that simplified individual LBT operations collectively satisfy regulatory requirements, allowing efficient independent processing while maintaining compliance through coordinated management
Data Source
AI summary
A communication method for communicating with a telecommunication system is provided, with a network node, a base station and a UE coordinately implementing the method. The telecommunication system transmits a control message comprising a channel occupancy duration COD field configured to indicate a duration candidate, such that the UE is configured with control message and enabled to perform transmission and/or reception over the unlicensed spectrum within a remaining channel occupancy duration RCOD determined from the control message.