COT-Aware Multi-Subband LBT Selection for Lower Interference
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Solution Overview
Problem
Conventional listen before talk (LBT) techniques in wireless communications systems are inefficient when a wireless device is scheduled to transmit data over multiple subbands, leading to potential interference and suboptimal resource utilization.
Innovation Solution
A wireless device performs LBT procedures for multiple subbands based on the channel occupancy time (COT) of a base station, selecting appropriate LBT procedures for each subband to optimize transmission efficiency and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LBT techniques are used for multiple subbands, then the wireless device can transmit data over multiple subbands, but the transmission efficiency is reduced and interference increases
Solution Approach 1:
The patent segments the LBT procedure into different types (first type for subbands within COT, second type for subbands outside COT) and applies them selectively to different subbands. This segmentation allows the wireless device to perform fewer LBT procedures overall while maintaining proper channel access etiquette, thereby improving transmission efficiency and reducing interference.
Solution Approach 2:
The patent applies different LBT procedure characteristics to different subbands based on their COT status. Subbands within the base station's COT receive a simplified LBT treatment (first type) while subbands outside COT receive the standard treatment (second type). This local differentiation optimizes transmission efficiency for COT subbands while maintaining interference protection for non-COT subbands.
2Reliability
If LBT procedures are performed for all subbands using the same procedure, then channel access is ensured, but power consumption increases
Solution Approach 1:
The patent segments the set of subbands into two groups: those within the base station's COT and those outside it. For subbands within COT, the wireless device performs a simplified first type LBT procedure with reduced monitoring requirements, while for subbands outside COT, it performs the standard second type LBT procedure. This segmentation maintains channel access reliability for all subbands while reducing power consumption for COT subbands.
Solution Approach 2:
The patent applies partial LBT action (first type procedure) to subbands that are already protected by the base station's COT, since full LBT monitoring is redundant for these subbands. The standard second type LBT procedure is applied only to subbands outside COT where full monitoring is necessary. This partial action approach maintains reliability where needed while reducing energy consumption where protection already exists.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless device such as a UE or a base station may implement one or more listen before talk (LBT) techniques. The wireless device may determine to transmit a communication during a transmission time interval on multiple subbands of a radio frequency spectrum band. The wireless device may identify whether the transmission time interval is during a channel occupancy time for the base station for a first set of subbands of the multiple subbands. The wireless device may perform one or more LBT procedures based on the identification. For example, the wireless device may perform an LBT procedure that is selected for each subband based on identifying that the transmission time interval is during the channel occupancy time for the first set of the subbands. The wireless device may transmit the communication based on a result of the LBT procedures.