Multi-Slot Sidelink Resource Selection Under LBT Failure
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Solution Overview
Problem
Communication systems in licensed and unlicensed frequency bands face challenges in selecting consecutive multiple slot resources for sidelink transmissions, particularly due to uncertain LBT failures, which affect data transmission reliability.
Innovation Solution
A method and apparatus for determining resources that support the selection of M consecutive slots for PSSCH or PSCCH transmissions, where M is a positive integer greater than 1, enabling continuous or repeated TB transmission to mitigate LBT failures and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LBT is performed in unlicensed frequency band, then transmission access is controlled to avoid interference, but transmission reliability deteriorates due to uncertain LBT failure
Solution Approach 1:
The network side device pre-configures multiple downlink grant indicators (DL_DCI) before the actual transmission, each corresponding to different LBT outcomes. This preliminary preparation allows the terminal to quickly determine transmission parameters without real-time negotiation, reducing the impact of uncertain LBT results on transmission reliability
Solution Approach 2:
The patent changes the parameter of resource allocation by introducing multiple downlink grant indicators that correspond to different time slot configurations. When LBT succeeds, one set of parameters is used; when LBT fails, alternative parameters are activated, thus adapting transmission parameters based on LBT outcomes to maintain reliability
2Ease of operation
If single slot resource selection is supported, then resource selection simplicity is maintained, but transmission reliability deteriorates due to LBT failure impact
Solution Approach 1:
The patent segments the resource selection process by dividing it into multiple downlink grant indicators, each corresponding to different slot configurations. This segmentation allows the system to maintain simple resource selection procedures while providing multiple fallback options to ensure transmission reliability when LBT fails
Solution Approach 2:
The patent implements partial action by configuring multiple downlink grant indicators beyond what a single slot selection would require. This excessive preparation of alternative grants ensures that even if some resources are unavailable due to LBT failure, sufficient resources remain to maintain transmission reliability without complicating the basic selection process
3Reliability
If consecutive multiple slot resources are selected, then transmission reliability is improved by reducing LBT failure impact, but resource determination complexity increases
Solution Approach 1:
The patent implements self-service by having the terminal device automatically determine the appropriate downlink grant indicator based on pre-configured mappings between indicators and slot configurations. This self-determination mechanism reduces the need for complex network-side coordination and simplifies resource determination while maintaining reliability through consecutive slot resources
Solution Approach 2:
The network side device performs preliminary configuration of multiple downlink grant indicators and their corresponding slot configurations before transmission. This advance preparation eliminates the need for complex real-time resource determination, allowing the terminal to simply select from pre-defined options while still benefiting from consecutive multi-slot resource allocation for improved reliability
Data Source
AI summary
Disclosed are a method and apparatus for resource determination. The method includes: determining a first resource based on a slot parameter M. A time domain length of the first resource is M consecutive slots, M is a positive integer and M>1, and the first resource is used for a PSSCH or PSCCH transmission.