V2X Synchronization Signal Segmentation for D2D Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current D2D communication standards, such as those in 3GPP Rel-12/13, are inadequate for high-speed scenarios like V2X communications, as they fail to support low-latency and high-reliability direct communications, particularly due to interference from V2X terminals' synchronization signals and PSBCHs, which disrupt D2D terminal synchronization processes.
Innovation Solution
A method for V2X communication that determines a unique NIDSL value and SLSS/DMRS configuration for VUEs, distinct from D2D systems, allowing VUEs to transmit synchronization signals and PSBCHs in a way that avoids interference with D2D terminals, by using different sequence indices and orthogonal masks based on the VUE's reference synchronization source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If V2X terminals transmit synchronization signals and PSBCHs using D2D communication standards, then V2X communication can be established, but interference occurs with D2D terminal synchronization processes
Solution Approach 1:
The synchronization signal space is segmented by dividing NID SL into two ranges: 0-167 for D2D terminals and 168-335 for V2X terminals. This segmentation creates distinct synchronization signal resources for different communication types, eliminating interference between D2D and V2X systems while maintaining各自 synchronization reliability
Solution Approach 2:
Different local qualities (sequence indices and orthogonal masks) are assigned to D2D and V2X terminals based on their NID SL ranges. D2D terminals use specific DMRS sequence indices and orthogonal masks, while V2X terminals use different ones, ensuring that each terminal type has optimized local characteristics suitable for its communication requirements without affecting the other
2Device complexity
If VUEs use the same NID SL range as D2D terminals, then resource allocation is simplified, but synchronization source reselection issues occur due to interference
Solution Approach 1:
The NID SL range is segmented into two distinct intervals: 0-167 for D2D terminals and 168-335 for V2X terminals. This segmentation prevents overlap between the two systems, ensuring that D2D terminals can accurately measure S-RSRP without interference from V2X synchronization signals, thereby maintaining measurement precision while keeping the allocation mechanism relatively simple
Solution Approach 2:
The parameter range of NID SL is changed and restricted for V2X terminals compared to D2D terminals. By modifying the NID SL parameter assignment rules to use different ranges, the patent prevents measurement errors caused by interference while maintaining manageable complexity through standardized allocation procedures
Data Source
AI summary
A communication method and equipment 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) are provided. A proposed method for transmitting a synchronization signal and a PSBCH in V2X communication includes determining, by a VUE, a value of NIDSL according to its reference synchronization source, NIDSL denoting a sidelink synchronization source ID; determining, by the VUE, an SLSS and a DMRS of a PSBCH different from a D2D system according to the value of NIDSL, wherein the SLSS comprises a PSSS and an SSSS, and the DMRS of the PSBCH is determined by a DMRS sequence of the PSBCH and an orthogonal mask of the DMRS of the PSBCH; and, transmitting, by the VUE, the SLSS and the PSBCH.