Sidelink Time-Domain Resource Pool Alignment Across TDD Coverage States
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Solution Overview
Problem
In partial network coverage sidelink communication, terminal devices inside and outside the base station's coverage face challenges in determining a consistent resource pool due to limited PSBCH capacity and flexible TDD configurations in NR V2X, leading to potential communication failures.
Innovation Solution
A method for determining a time domain resource pool by using RRC signaling and PSBCH to align TDD configurations, with specific slot set determination and bitmap mapping to ensure consistent resource allocation for terminal devices within and outside the base station's coverage, minimizing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSBCH is used to convey TDD configuration for sidelink communication, then terminal devices outside coverage can obtain timing information, but the limited PSBCH capacity cannot support flexible TDD configurations in NR V2X
Solution Approach 1:
The TDD configuration information is segmented into two parts: essential timing information is conveyed through PSBCH for terminal devices outside coverage, while complete flexible TDD configuration is provided through RRC signaling for terminal devices inside coverage. This segmentation allows the system to support flexible configurations without overwhelming the limited PSBCH capacity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station acts as a mediator to provide different levels of TDD configuration information to terminal devices based on their coverage status. Devices inside coverage receive full configuration via RRC, while devices outside coverage receive essential timing information via PSBCH, eliminating the need for PSBCH to carry complete flexible configurations.
2Adaptability or versatility
If different TDD configurations are used for terminal devices inside and outside coverage, then each device can optimize its resource allocation, but resource pool inconsistency leads to communication failures
Solution Approach 1:
The patent applies local quality by allowing different TDD configuration details at different locations: terminal devices inside coverage receive full flexible TDD configurations optimized for their specific conditions, while terminal devices outside coverage receive standardized essential timing information. Despite these local differences, both groups operate within a consistent resource pool framework that ensures communication reliability.
Solution Approach 2:
The patent changes the parameter representation of TDD configuration based on coverage status. Inside coverage, detailed TDD configuration parameters are provided via RRC signaling for optimal resource allocation. Outside coverage, simplified timing parameters are provided via PSBCH. Both parameter sets map to the same resource pool structure, ensuring consistency while maintaining flexibility where possible.
3Adaptability or versatility
If complete TDD configuration is provided to all terminal devices, then resource allocation flexibility is maximized, but system implementation complexity increases
Solution Approach 1:
The patent applies partial action by providing complete TDD configuration information only to terminal devices inside coverage where it is most needed for optimal resource allocation. Terminal devices outside coverage receive essential timing information sufficient for basic operation. This partial provision of information maintains resource allocation flexibility for devices that need it while reducing system complexity for devices that operate with limited information.
Data Source
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AI summary
Provided are a time-domain resource determination method and apparatus, and a terminal device. The method comprises: a terminal device determining a first slot set within a first period according to a first time division duplexing (TDD) configuration in radio resource control (RRC) signaling or a second TDD configuration in a physical sidelink broadcast channel (PSBCH); and the terminal device selecting some slots from the first slot set according to a first bitmap, wherein said slots constitute time-domain resources in a resource pool.