Sidelink S-SSB Slot Scheduling After LBT Failures
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Solution Overview
Problem
In cases where listen-before-talk (LBT) fails to be performed in some or all resource block sets in a sidelink synchronization signal block (S-SSB) slot, the synchronization performance of terminal devices is affected, leading to synchronization failures between devices.
Innovation Solution
A wireless communication method and system that includes configuring a target resource block set for preferential LBT and defining additional S-SSB slots for LBT attempts, along with network device configuration to indicate frequency domain locations and intervals for S-SSB slots, ensuring synchronization is maintained despite LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal device performs LBT in all RB sets in S-SSB slot, then synchronization coverage is maximized, but power consumption increases and synchronization reliability decreases when LBT fails
Solution Approach 1:
The patent segments the S-SSB slot into multiple RB sets and introduces a first type of S-SSB slot with selective LBT operation. The terminal device performs LBT only in a first RB set (out of multiple RB sets) in the first type of S-SSB slot, rather than in all RB sets. This segmentation allows the device to maintain synchronization functionality while reducing power consumption and avoiding the need to transmit in all RB sets when LBT fails.
2Reliability
If terminal device performs LBT in all RB sets, then synchronization opportunity is maximized, but when LBT fails in some RB sets, synchronization performance deteriorates
Solution Approach 1:
The patent divides S-SSB slots into different types (first type and second type) with different LBT requirements. The first type of S-SSB slot uses a first RB set with LBT operation, while the second type uses a second RB set without LBT operation. This segmentation provides clear operational rules for different scenarios, reducing the complexity of determining what to do when LBT fails in certain RB sets.
Solution Approach 2:
The network device pre-configures the terminal device with information about different S-SSB slot types, RB set assignments, and LBT requirements before the terminal device needs to perform synchronization. This preliminary configuration allows the terminal device to quickly determine the appropriate operation without complex real-time decision-making when LBT fails.
3Reliability
If terminal device transmits S-SSB in all available slots, then synchronization coverage is improved, but interference increases and resource efficiency decreases
Solution Approach 1:
The patent implements periodic S-SSB transmission with different slot types. The first type of S-SSB slot (with LBT in first RB set) and second type of S-SSB slot (without LBT in second RB set) are transmitted periodically with configured intervals. This periodic structure with selective LBT operation reduces unnecessary transmissions and associated interference while maintaining adequate synchronization coverage.
Data Source
AI summary
This application provides a wireless communication method, a terminal device, and a network device. The wireless communication method includes: in a case that a terminal device fails to perform listen-before-talk LBT in some or all of resource block RB sets in a first sidelink synchronization signal block S-SSB slot, performing, by the terminal device, a first operation.