Sidelink Resource Mapping Across COT in Unlicensed Spectrum
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Solution Overview
Problem
There is a need to improve Sidelink (SL) communication procedures in 5G/New Radio (NR) environments, particularly in unlicensed spectrum, for resource selection in PSFCH Cross-COT transmissions, PSFCH retransmissions, SL HARQ reporting, and listen-before-talk (LBT) applications, to enhance coverage and support the increasing demand for wireless communication.
Innovation Solution
A user equipment (UE) device configures SL transmissions by obtaining a Channel Occupancy Time (COT) configuration, determining a resource selection pattern, and transmitting SL communications using unlicensed spectrum, including PSFCH cross-COT transmissions, retransmissions, and HARQ reporting, while coordinating with neighboring terminals and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resources are selected from unlicensed spectrum for SL transmissions, then coverage and wireless communication demand are enhanced, but resource allocation efficiency and transmission reliability may deteriorate due to spectrum congestion and interference
Solution Approach 1:
The resource selection process is segmented into multiple stages: initial resource pool configuration, COT-based resource determination, and pattern-based resource selection. This segmentation allows the system to manage unlicensed spectrum resources systematically, improving reliability by breaking down the complex resource allocation into controllable segments while supporting diverse SL transmission types (PSFCH cross-COT, retransmissions, HARQ reporting).
Solution Approach 2:
The system performs preliminary actions by pre-configuring resource pools and COT parameters before actual SL transmissions occur. The terminal determines resource selection patterns in advance based on COT configurations, which prepares the system to handle unlicensed spectrum transmissions reliably without real-time decision delays, thus enhancing both coverage and transmission reliability.
2Productivity
If SL transmissions are performed in unlicensed spectrum, then spectrum utilization is improved, but interference and collision with other transmissions increase
Solution Approach 1:
The resource selection pattern mechanism incorporates feedback from COT configurations and SL transmission outcomes. The system monitors transmission success and adjusts resource selection patterns accordingly, reducing interference and collision by learning from past transmissions while maintaining high spectrum utilization for SL communications.
Solution Approach 2:
The system dynamically changes parameters such as resource selection patterns, COT durations, and frequency offsets based on channel conditions and interference levels. This allows the terminal to adapt resource allocation in unlicensed spectrum, improving spectrum utilization while mitigating interference and collision through parameter optimization.
3Productivity
If resource selection patterns are determined based on COT configuration, then transmission coordination and efficiency are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The COT configuration framework serves multiple functions simultaneously: it defines resource pools, determines transmission timing, coordinates uplink/downlink/sidelink resources, and establishes pattern selection criteria. This multi-functionality improves transmission coordination efficiency while reducing overall system complexity by consolidating control mechanisms into a universal COT-based framework.
Data Source
AI summary
A terminal may include a processor configured to obtain a Channel Occupancy Time (“COT”) configuration for a Sidelink (“SL”) transmission. The processor may be configured to determine, based on the COT configuration, a resource selection pattern including resources selected from a portion of an unlicensed spectrum. The terminal may include a transmitter coupled to the processor and configured to transmit the SL transmission, in accordance with the resource selection pattern.