Multi-Slot Sidelink Transmission Structure for Unlicensed Spectrum
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Solution Overview
Problem
Current sidelink (SL) communications in unlicensed spectrum do not support multi-slot transmissions, leading to inefficient use of resources and increased channel assessment procedures, which hampers faster and higher throughput communications between user equipments (UEs).
Innovation Solution
Implementing multi-slot SL-U transmissions with structured arrangements of symbol types and resource block sets, including AGC, PSCCH, PSSCH, and PSFCH symbols across multiple slots, and configuring first and second stage SCI for resource allocation, enabling full or partial bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-slot SL transmissions are used in unlicensed spectrum, then channel assessment procedures are performed before each transmission, but throughput and communication efficiency deteriorate
Solution Approach 1:
The patent combines multiple single-slot transmissions into a single multi-slot transmission structure. By merging control channels (PSCCH) and data channels (PSSCH) across multiple slots, the system performs channel assessment only once before the multi-slot transmission begins, eliminating repeated CCA procedures and thereby increasing throughput while reducing time loss.
2Productivity
If multi-slot SL transmissions are implemented, then resource utilization efficiency improves, but complexity of resource block configuration increases
Solution Approach 1:
The patent segments the multi-slot transmission into distinct resource block sets, where each set is configured with specific parameters including bandwidth indications. This segmentation allows the system to manage complex multi-slot resource allocation by dividing it into manageable units, each with its own configuration, thereby improving resource utilization while controlling complexity through structured organization.
3Productivity
If continuous multi-slot transmissions are used, then spectral efficiency increases, but ability to perform clear channel assessment deteriorates
Solution Approach 1:
The patent incorporates periodic gaps within the multi-slot transmission structure. These gaps are strategically placed to allow receiving UEs to perform clear channel assessment procedures at regular intervals during the multi-slot transmission. The periodic interruption maintains the ability to monitor channel conditions while preserving overall spectral efficiency through the continuous transmission framework.
Data Source
AI summary
Techniques discussed herein can facilitate multi-slot sidelink transmissions in the unlicensed spectrum. One example aspect is a baseband processor of a user equipment (UE), comprising a memory and one or more processors configured to, when executing instructions stored in the memory, cause the UE to determine a resource block (RB) set configuration for a multi-slot sidelink transmission with n slots. The one or more processors are further configured to determine a sidelink control information (SCI) configuration, based on the RB set configuration and generate SCI for the multi-slot sidelink transmission based on the SCI configuration. The SCI configuration includes a first stage SCI in a physical sidelink control channel (PSCCH) and a second stage SCI in a physical sidelink shared channel (PSSCH). Subsequently, the one or more processors are further configured to transmit the multi-slot sidelink transmission over the n slots where the multi-slot sidelink transmission includes the PSCCH and the PSSCH.