NR V2X Sidelink Synchronization for LTE-NR Coexistence
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink communication between devices with coexisting NR and LTE modules, particularly in V2X scenarios, leading to ambiguity in NR S-SSB transmission and interference with LTE V2X operations.
Innovation Solution
A method for sidelink communication involving a first device that receives synchronization information, aligns LTE and NR synchronizations, generates NR sidelink synchronization signals and broadcast channels, and transmits control and data information using NR modules, minimizing interference and ambiguity during in-device coexistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NR and LTE modules coexist in a device for sidelink communication, then communication capability is enhanced, but ambiguity in NR S-SSB transmission and interference with LTE V2X operations occurs
Solution Approach 1:
The patent segments the synchronization signal transmission by defining distinct types (Type 1 for autonomous generation, Type 2 for network-configured) and distinct frequencies (first frequency for LTE, second frequency for NR). This segmentation allows NR and LTE modules to operate simultaneously without interference, as each module transmits on its designated frequency and follows its designated type, resolving the ambiguity and interference problem while maintaining enhanced communication capability
Solution Approach 2:
The patent introduces a frequency dimension separation where LTE V2X synchronization signals operate on a first frequency and NR sidelink synchronization signals operate on a second frequency. This dimensional separation in the frequency domain allows both LTE and NR modules to coexist without mutual interference, transforming the conflict into a resolved multi-dimensional operation
2Device complexity
If NR synchronization is obtained independently without alignment to LTE synchronization, then NR module operation is simplified, but synchronization ambiguity and interference with LTE V2X occurs
Solution Approach 1:
The patent introduces synchronization alignment as an intermediary mechanism between LTE and NR modules. The NR module's synchronization is aligned to the LTE module's synchronization through coordinated timing relationships, acting as a mediator that ensures both modules operate in harmony without causing ambiguity or interference, while maintaining manageable complexity through standardized alignment procedures
3Adaptability or versatility
If NR S-SSB transmission is not clearly defined for in-device coexistence, then implementation flexibility is maintained, but transmission ambiguity and LTE V2X interference occurs
Solution Approach 1:
The patent resolves transmission ambiguity by defining specific parameters for NR S-SSB transmission in in-device coexistence scenarios: transmission type (Type 1 or Type 2), operating frequency (second frequency distinct from LTE's first frequency), and synchronization alignment relationships. These parameter definitions provide clear implementation guidance while maintaining flexibility through the Type 1/Type 2 selection, eliminating ambiguity without sacrificing adaptability
Data Source
AI summary
An embodiment of the present disclosure provides a method for performing sidelink communication by a first device. The method may comprise the steps of: receiving synchronization information from a synchronization source; acquiring LTE synchronization on the basis of the synchronization information via an LTE module included in the first device; acquiring NR synchronization arranged with the LTE synchronization, via an NR module included in the first device; generating NR SLSS and NR PSBCH information on the basis of information related to the LTE synchronization and the arranged NR synchronization; transmitting an NR S-SSB, which includes the NR SLSS and NR PSBCH information, to a second device performing sidelink communication on the basis of the NR module; transmitting first SCI to the second device via a PSCCH; and transmitting, to the second device, data and second DCI differing from the first SCI via a PSSCH related to the PSCCH on the basis of a sidelink resource determined on the basis of the first SCI.