Wideband PSSCH and PSFCH Mapping Under Partial LBT Availability
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Solution Overview
Problem
In 5G NR-U sidelink communication, not all listen-before-talk (LBT) bandwidths are available for transmitting PSSCH, necessitating improved transmission policies for different scenarios.
Innovation Solution
Configuring PSSCH transmission based on measuring LBT bandwidths and refraining from transmission in certain RB sets when thresholds are exceeded, and implementing PSFCH with HARQ feedback mapped to specific RB sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If PSSCH transmission is performed across all LBT bandwidths, then transmission coverage is maximized, but transmission reliability deteriorates due to channel occupancy by other devices
Solution Approach 1:
The patent divides the wideband carrier into multiple LBT bandwidths and further segments them into RB sets. The Tx UE performs LBT independently on each LBT bandwidth and transmits PSSCH only in the RB sets corresponding to successful LBT bandwidths. This segmentation allows the system to maintain transmission coverage across multiple frequency segments while ensuring reliability by avoiding segments with occupied channels.
Solution Approach 2:
The patent implements partial transmission by allowing PSSCH to be transmitted in only those RB sets where LBT succeeds, rather than requiring transmission across the entire carrier bandwidth. This partial action approach maintains acceptable transmission coverage through successful segments while significantly improving reliability by excluding segments with channel occupancy.
2Reliability
If PSSCH transmission is restricted to successful LBT bandwidths only, then transmission reliability is improved, but transmission coverage is reduced
Solution Approach 1:
By segmenting the carrier into multiple LBT bandwidths and RB sets, the system can transmit PSSCH in multiple separate frequency segments simultaneously. This segmentation compensates for the coverage reduction in any single failed LBT bandwidth by maintaining transmission in other successful bandwidths, thus preserving overall transmission coverage while improving reliability.
Solution Approach 2:
The patent transitions from a single-dimensional transmission approach (all-or-nothing across the carrier) to a multi-dimensional approach by independently controlling transmission in multiple frequency segments. This dimensional change allows the system to optimize reliability in each segment while maintaining aggregate coverage across all segments.
3Area of stationary object
If PSFCH is transmitted in all RB sets, then feedback coverage is maximized, but resource waste increases due to LBT failure in certain RB sets
Solution Approach 1:
The patent segments the PSFCH transmission resources to match the PSSCH transmission segments. The Rx UE transmits PSFCH only in the RB sets corresponding to successful LBT bandwidths, rather than attempting transmission in all RB sets. This segmentation eliminates resource waste in failed LBT bandwidths while maintaining feedback coverage for all successfully transmitted PSSCH data.
Solution Approach 2:
The system uses the LBT success/failure information from the PSSCH transmission phase to automatically determine PSFCH transmission resources. This self-service approach allows the feedback channel to adaptively use only the necessary resources without external configuration, eliminating waste while ensuring coverage.
4Productivity
If wideband carrier is used for sidelink communication, then data rate is increased, but LBT failure probability increases due to channel occupancy
Solution Approach 1:
The patent segments the wideband carrier into multiple independent LBT bandwidths and RB sets, allowing parallel transmission in multiple segments. This segmentation enables the system to achieve high data rates through aggregate bandwidth while maintaining high LBT success rates in each individual segment, as the probability of all segments being simultaneously occupied is significantly reduced.
Solution Approach 2:
By enabling transmission in multiple RB sets corresponding to successful LBT bandwidths, the patent ensures continuous useful action across the available spectrum. Even if some LBT bandwidths fail, transmission continues in successful bandwidths, maintaining high overall productivity while accepting and managing the reduced LBT success rate through diversity.
Data Source
AI summary
A UE may be configured to measure each of a plurality of LBT bandwidths of a PSSCH, and refrain from transmitting a SL transmission in the PSSCH or transmit the SL transmission in at least one RB set associated with the plurality of LBT bandwidths other than a first LBT bandwidth of the PSSCH. The SL transmission may be transmitted or refrained from being transmitted based on a first measurement of the first LBT bandwidth of the PSSCH being greater than a threshold value. The UE may receive a parameter associated with transmitting the SL transmission in the at least one RB set associated with the plurality of LBT bandwidths other than the first LBT bandwidth of the PSSCH.