Partial Sidelink Transmission Across LBT Sub-Bands
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting sidelink messages using wideband operations in unlicensed radio frequency spectrum bands due to failed listen-before-talk procedures, leading to incomplete or unsuccessful transmissions.
Innovation Solution
Implementing techniques for partial sidelink transmission using wideband operations, where a UE performs multiple listen-before-talk procedures across multiple sub-bands and transmits sidelink messages only on sub-bands with successful procedures, while adjusting resource allocation based on successful LBT sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LBT procedures are performed across multiple sub-bands for wideband operations, then spectrum efficiency and resource utilization are improved, but the complexity of channel access procedures increases
Solution Approach 1:
The wideband carrier is divided into multiple LBT sub-bands, allowing the UE to perform LBT procedures independently on each sub-band. This segmentation enables partial transmission success even when some sub-bands fail LBT, thereby improving transmission reliability without requiring all procedures to succeed
Solution Approach 2:
The system dynamically adjusts resource allocation based on which LBT sub-bands succeed or fail. The UE transmits sidelink messages only on sub-bands where LBT procedures succeed, creating a dynamic transmission strategy that adapts to real-time channel conditions and maximizes usable spectrum
2Reliability
If LBT procedures are performed on all sub-bands before transmission, then spectrum efficiency is improved, but transmission time and latency increase
Solution Approach 1:
The UE performs LBT procedures on multiple sub-bands before transmission to identify which sub-bands are available. This preliminary action on multiple sub-bands simultaneously allows the system to maximize spectrum efficiency while preparing for transmission across all potential channels in advance
3Productivity
If partial sidelink transmission is enabled using only successful LBT sub-bands, then data rates are improved, but the complexity of resource allocation increases
Solution Approach 1:
Different sub-bands are treated differently based on their individual LBT outcomes. Successful sub-bands are used for transmission while failed sub-bands are excluded, creating a localized quality approach where each sub-band's transmission characteristics are optimized independently based on channel access success
Solution Approach 2:
Resource allocation is dynamically adjusted based on LBT success patterns. The system transitions from static wideband allocation to dynamic partial band allocation, allowing data rates to improve by utilizing only successful sub-bands while the allocation complexity is managed through standardized procedures
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message that indicates, to the UE, to perform wideband operations for partial sidelink messages using a carrier of an unlicensed radio frequency spectrum band. The carrier may include multiple listen-before-talk (LBT) sub-bands and the wideband operations may be associated with communications using a bandwidth that exceeds a threshold bandwidth. In some examples, the UE may perform multiple LBT procedures for the multiple LBT sub-bands and one or more LBT procedures may fail. The UE may transmit the one or more portions of the sidelink message using the one or more LBT sub-bands based on the one or more LBT procedures being associated with a first LBT sub-band different from a second LBT sub-band used for transmission of sidelink control information (SCI).