Sidelink Waveform Preparation for Contiguous RB Sets in Unlicensed Bands
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Solution Overview
Problem
Sidelink-unlicensed (SL-U) communication systems face channel access uncertainty due to listen-before-talk (LBT) requirements, limiting bandwidth usage in wireless communication systems, particularly in 5G NR technology, as devices struggle to determine available frequencies within the given time constraints.
Innovation Solution
The solution involves preparing control and data waveforms for multiple resource blocks (RBs) within a bandwidth part (BWP) of an unlicensed frequency band, allowing for dynamic determination and use of available SL-U frequencies, enabling transmission and reception of sidelink data in a waveform generated before the LBT procedure, and utilizing interlaced physical sidelink control and shared channels that span multiple contiguous RBs, including those within guard bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk (LBT) procedure is performed to determine channel availability, then channel access reliability is improved, but bandwidth utilization deteriorates due to limited available frequencies and time constraints
Solution Approach 1:
The patent prepares control and data waveforms for multiple resource blocks in advance, before the LBT procedure determines channel availability. This preliminary waveform preparation ensures that when the channel is determined to be available, transmission can occur immediately without additional processing delays, thereby improving bandwidth utilization while maintaining reliable channel access through the LBT procedure
2Reliability
If LBT requirements are enforced in SL-U spectrum, then channel access fairness is improved, but the amount of usable bandwidth deteriorates due to channel access uncertainty
Solution Approach 1:
The patent enables dynamic selection and transmission across multiple contiguous resource blocks based on LBT outcomes. The system adapts the transmission bandwidth dynamically by selecting the largest contiguous set of RBs that are available, allowing the usable bandwidth to vary according to channel conditions while maintaining fair access through the LBT mechanism
3Productivity
If waveforms are prepared for multiple resource blocks before LBT, then transmission efficiency is improved, but device complexity increases due to dynamic RB selection and waveform management
Solution Approach 1:
The patent divides the available spectrum into multiple discrete resource block sets that can be independently evaluated for availability. Each RB set can be assessed separately through LBT, allowing the system to select contiguous combinations of available RBs. This segmentation simplifies the waveform management complexity by providing a structured, modular approach to dynamic RB selection
Data Source
AI summary
The present disclosure provides solutions to sidelink transmission/reception problems by preparing waveforms for multiple resource blocks (RBs) in a given bandwidth. Upon determining the availability of RBs or sets of RBs the apparatuses and methods of the present disclosure allow for dynamic determination and use of available sidelink frequencies. An apparatus may comprise a memory and at least one processor coupled to the memory and configured to transmit and/or receive sidelink data in at least one contiguous set of RBs within a bandwidth part (BWP) of an unlicensed frequency band, the BWP including a plurality of RB sets, wherein the SL data is transmitted and/or received in a waveform generated for at least one of the plurality of RB sets prior to a listen-before-talk procedure indicating an availability of the at least one contiguous set of RBs for transmission.