Sidelink Synchronization Signal Bandwidth Occupancy in Unlicensed V2X
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Solution Overview
Problem
There is a need for a method to design synchronization signals for sidelink communication in the unlicensed spectrum that meets the occupancy channel bandwidth requirement, ensuring efficient communication in vehicle-to-everything (V2X) systems, where existing technologies lack effective solutions for synchronization in this frequency band.
Innovation Solution
A user equipment (UE) is configured to transmit a synchronization signal that occupies more than 11 resource blocks (RBs), utilizing a primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH), with the signal structured to cover a wider bandwidth and potentially spread across multiple symbols, ensuring compliance with the 80% bandwidth usage requirement in the unlicensed band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronization signal is transmitted in the unlicensed spectrum, then sidelink synchronization can be achieved, but the transmission may not meet the 80% bandwidth usage requirement
Solution Approach 1:
The synchronization signal is segmented into multiple parts transmitted across different resource blocks. Instead of concentrating all signal energy in a single narrow bandwidth, the signal is divided and distributed across multiple resource blocks to collectively occupy more than 80% of the channel bandwidth, thereby satisfying the regulatory requirement while maintaining synchronization reliability.
Solution Approach 2:
The patent transitions from a single-dimension bandwidth approach to a multi-dimensional resource allocation strategy. By utilizing both frequency domain (multiple resource blocks) and time domain (multiple symbols) dimensions, the synchronization signal achieves wide bandwidth occupancy without sacrificing synchronization performance.
2Productivity
If the synchronization signal occupies more than 11 resource blocks, then the 80% bandwidth usage requirement is met, but the signal structure becomes more complex
Solution Approach 1:
The synchronization signal structure is designed to serve multiple functions simultaneously: it provides synchronization information, occupies required bandwidth for regulatory compliance, and maintains compatibility with existing sidelink communication protocols. This multi-functionality reduces the need for separate mechanisms for each requirement.
Solution Approach 2:
The patent modifies key parameters of the synchronization signal including bandwidth occupancy (greater than 80% of channel bandwidth), resource block allocation (more than 11 RBs), and time-domain distribution (across multiple symbols). These parameter changes enable the signal to meet regulatory requirements while maintaining manageable structural complexity through standardized waveform designs.
3Productivity
If synchronization signal is transmitted across multiple symbols, then bandwidth occupancy is increased, but transmission time is extended
Solution Approach 1:
The synchronization signal is transmitted in advance across multiple symbols to establish bandwidth occupancy before data transmission begins. This preliminary action ensures that the 80% bandwidth requirement is met from the outset, preventing subsequent conflicts with data transmission resource allocation.
Solution Approach 2:
The synchronization signal uses periodic transmission across multiple symbols rather than continuous transmission. This periodic structure achieves the required bandwidth occupancy over the transmission period while allowing gaps that reduce overall transmission time and enable other communications to occur in between.
Data Source
AI summary
A user equipment (UE) and a method of transmission of the same are provided. The method includes transmitting a first transmission, wherein the first transmission is used for synchronization and the first transmission occupies a bandwidth more than 11 resource blocks (RBs).