Flexible Slot Format Adaptation in NR V2X Sidelink
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Solution Overview
Problem
In wireless communication systems, particularly in NR sidelink and V2X communications, the flexible slot format poses challenges in efficiently performing sidelink transmission due to variations in the number of symbols constituting an SL slot, leading to difficulties in resource reservation and transmission reliability.
Innovation Solution
A method where a UE performs sensing based on pre-configured resource units, selects a transmission resource, and adapts to changes in the slot format by reserving or selecting resources with appropriate symbol counts, ensuring effective sidelink communication even with differing numbers of symbols between slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible slot format is used in NR sidelink communication, then the system can adapt to different communication requirements and scenarios, but the varying number of symbols in slots causes difficulties in resource reservation and transmission reliability
Solution Approach 1:
The patent changes the parameter of slot format configuration to be flexible rather than fixed. The network can dynamically adjust the number of symbols in each slot according to different communication scenarios, traffic types, and quality of service requirements. This parameter change enables the system to adapt between different slot formats (e.g., all-downlink, all-uplink, or mixed slots) while maintaining reliable transmission through proper resource allocation and sensing mechanisms
2Adaptability or versatility
If the number of symbols in SL slots varies, then the system can accommodate different transmission requirements, but resource selection and reservation become complex and uncertain
Solution Approach 1:
The patent implements preliminary action by having UEs perform sensing operations in advance before selecting transmission resources. The sensing phase occurs before the actual resource selection, allowing the UE to gather information about channel conditions, interference levels, and resource availability. This preliminary sensing action simplifies the subsequent resource selection process by providing a foundation for making informed decisions about which resources to use, even when slot formats vary
Solution Approach 2:
The patent employs feedback mechanisms where UEs continuously monitor and sense the sidelink channel conditions. The sensing results feed back into the resource selection process, allowing UEs to adapt their resource choices based on current channel state information, interference measurements, and observations of other UEs' transmissions. This feedback loop simplifies resource selection by providing real-time information that guides resource allocation decisions in flexible slot formats
Data Source
AI summary
Provided is a method for a first device (100) to perform sidelink transmission. The method may comprise: a step for performing sensing on a plurality of resources on the basis of a first resource unit including one or more symbols; a step for selecting a first transmission resource from the plurality of resources on the basis of the sensing; and a step for performing the sidelink transmission on the first transmission resource.