V2X Time-Frequency Synchronization Signal Resource Allocation
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Solution Overview
Problem
Current 3GPP D2D communication standards fail to support low-delay and high-reliability direct communications, especially in V2X scenarios where cellular network and GNSS coverage is limited, lacking a mature implementation for time-frequency synchronization between V2X terminals.
Innovation Solution
A method and device for V2X communication that identifies configuration information including synchronization priority, receives synchronization signals, and selects a reference synchronization source based on priority, reusing or reconfiguring time-frequency resources and sequences to transmit synchronization signals, and determines synchronization source types and priorities for receiving terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 3GPP D2D communication standards are used, then basic direct communication is supported, but low-delay and high-reliability communication requirements in V2X scenarios cannot be met
Solution Approach 1:
The patent implements dynamic synchronization source selection by allowing V2X terminals to switch between different synchronization sources (GNSS, base station, or other V2X terminals) based on real-time signal quality and availability. This dynamic adaptation enables the system to maintain high reliability in varying V2X scenarios including tunnels, urban canyons, and open areas where different synchronization sources may be available.
Solution Approach 2:
The patent changes the synchronization parameter structure by introducing priority levels for different synchronization sources and allowing configurable synchronization periods. V2X terminals can adjust synchronization parameters such as the selection of synchronization signal blocks (SSBs), timing advance values, and synchronization source priorities to optimize communication reliability for specific V2X applications.
2Reliability
If time-frequency resources are allocated for synchronization signals, then synchronization between V2X terminals is achieved, but resource conflict with existing D2D terminals occurs
Solution Approach 1:
The patent segments the synchronization resource space by introducing dedicated V2X synchronization resource pools that are separate from traditional D2D synchronization resources. This segmentation is achieved through specific physical layer configurations including dedicated SSB positions, frequency resources, and time resources for V2X synchronization signals, eliminating resource conflicts while maintaining synchronization reliability.
Solution Approach 2:
The patent introduces a synchronization indicator field in the physical layer data that acts as an intermediary to identify whether a synchronization signal originates from a V2X terminal or a traditional D2D terminal. This intermediary mechanism allows receiving terminals to properly distinguish and process synchronization signals from different sources without resource conflict.
3Productivity
If V2X terminals transmit synchronization signals using existing D2D resources, then resource reuse is achieved, but synchronization signal differentiation becomes difficult
Solution Approach 1:
The patent applies local quality differentiation by configuring V2X synchronization signals with distinct local characteristics including specific SSB beamforming patterns, dedicated frequency resource allocations, and unique synchronization signal sequences. These localized quality differences enable receiving terminals to easily differentiate V2X synchronization signals from D2D synchronization signals even when transmitted on overlapping time-frequency resources.
Solution Approach 2:
The patent introduces asymmetry in the synchronization signal structure by using non-reciprocal configurations for V2X and D2D terminals. V2X terminals transmit synchronization signals with specific directional beamforming and resource allocation patterns that differ from D2D terminals, creating asymmetric signal characteristics that simplify detection and measurement at the receiving end.
Data Source
AI summary
Provided are a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT), with a transmission and receipt processing method and device for time-frequency synchronization between V2X terminals. When a synchronization signal to be transmitted is identical to a synchronization signal of an existing D2D terminal, time-frequency resources configured for the D2D terminal in a cell are reused to transmit the synchronization signal. When synchronization signal to be transmitted is different from a synchronization signal of an existing D2D terminal, reconfigured time-frequency resources are used to transmit the synchronization signal. The synchronization signal transmitted by a V2X terminal indicates a corresponding synchronization source type by using a value of an SLSS sequence index and/or a value of a PSBCH specified field.