Sidelink DCI 3_0 for Unlicensed Mode 1 Resource Selection
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Solution Overview
Problem
Current SL resource selection techniques fail to provide adequate solutions for mode 1 SL resource selection or allocation in unlicensed bands, lacking clear channel assessment (CCA) types, time gap information, cyclic prefix (CP) extensions, and multi-transmission time interval (multi-TTI) scheduling.
Innovation Solution
The introduction of SL DCI 3_0, which includes frequency resource assignment, time resource assignment, CCA type, time gap, and CP extension information, along with multi-TTI scheduling, to facilitate effective SL resource selection in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current SL resource selection techniques are used, then device complexity is reduced, but reliability is insufficient for unlicensed band communications
Solution Approach 1:
The DCI message is segmented into multiple distinct fields, each handling a specific aspect of resource selection (frequency resource assignment, time resource assignment, CCA type, time gap, CP extension). This segmentation allows the system to provide comprehensive resource selection capabilities while keeping each individual field manageable and well-defined.
Solution Approach 2:
The base station performs preliminary actions by pre-configuring and signaling all necessary resource selection parameters (frequency resources, time resources, CCA type, time gap, CP extension) through DCI 3_0 before the UE needs to perform sidelink transmission. This preliminary provisioning ensures the UE has all required information ready, improving reliability without adding complex real-time decision-making at the UE side.
2Loss of information
If SL DCI 3_0 with multiple information fields is implemented, then completeness of resource selection information is improved, but message size and processing complexity increase
Solution Approach 1:
DCI 3_0 is designed as a universal message format that can convey multiple types of resource selection information (frequency, time, CCA type, time gap, CP extension) within a single standardized structure. This multi-functionality ensures complete information transmission while avoiding the need for multiple separate messages or complex adaptive formatting.
Solution Approach 2:
The DCI 3_0 message uses well-defined parameter fields with specific bit allocations and encoding schemes. Each parameter (frequency resource assignment, time resource assignment, CCA type, time gap, CP extension) has a standardized representation, which simplifies processing despite the comprehensive information content. The structured parameter changes allow efficient parsing and interpretation.
3Reliability
If CCA type, time gap, and CP extension information are provided, then reliability of channel access is improved, but use of signaling resources increases
Solution Approach 1:
The patent merges multiple critical channel access parameters (CCA type, time gap, CP extension) into a single DCI 3_0 message along with frequency and time resource assignments. By combining these previously separate signaling elements into one unified message, the system improves channel access reliability through comprehensive information provision while minimizing total signaling overhead compared to using multiple separate messages.
Data Source
AI summary
The techniques described herein provide solutions for enabling sidelink (SL) unlicensed band or spectrum (SL-U) communications via SL downlink control information (DCI) 3_0 for resource selection mode 1. The SL DCI 3_0 may include frequency resource assignment information, time resource assignment information, clear channel assessment (CCA) type information, time gap information, and cyclic prefix (CP) extension information, and more. A partial bandwidth (BW) or full BW may be allocated to a user equipment (UE) and multi transition time interval (multi-TTI) scheduling may be used. Multiple SL transmission starting positions may be used and may be continuous or non-continuous. Bi-directional SL DCI 3_0 may also be transmitted to multiple UEs.