Directional Synchronization Signals in Millimeter Wave Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless communication systems face challenges in efficiently detecting base stations, especially in high signal strength and noise-limited millimeter wave systems, due to the fixed location of secondary synchronization signals relative to primary synchronization signals, which complicates cell identification and synchronization.
Innovation Solution
A dual-signal synchronization scheme is employed, utilizing a narrowband signal to convey initial cell ID and timing information, allowing user equipment (UE) to locate and receive a wideband signal by determining its frequency and time location, thereby simplifying the detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional fixed-location synchronization signals are used, then base station coverage is provided, but cell identification and synchronization complexity increases due to the need to detect both PSS and SSS at fixed locations
Solution Approach 1:
The synchronization signal is segmented into two distinct components: a narrowband synchronization signal (NB-SS) for initial detection and cell identification, and a wideband synchronization signal (WB-SS) for enhanced synchronization. This segmentation allows the UE to first detect the NB-SS at any frequency location to obtain cell ID and timing information, then use that information to locate and detect the WB-SS, thereby simplifying the overall synchronization process while maintaining coverage.
Solution Approach 2:
The narrowband synchronization signal performs preliminary detection and cell identification before the wideband signal is detected. By first acquiring cell ID and timing information from the NB-SS, the UE is prepared to efficiently locate and detect the WB-SS at the determined frequency location, eliminating the need for exhaustive searches and reducing synchronization complexity.
2Area of stationary object
If beamformed synchronization signals are swept across the cell coverage area, then coverage enhancement is provided, but signal detection time increases due to the sweeping process
Solution Approach 1:
The synchronization signaling is divided into narrowband and wideband components that can be transmitted simultaneously or in different time slots across the coverage area. The narrowband signal provides initial detection capability throughout the coverage area, while the wideband signal provides enhanced synchronization information, reducing the time required for complete synchronization compared to traditional sweeping methods.
Solution Approach 2:
The narrowband synchronization signal performs preliminary detection across the coverage area first, providing UE with cell ID and timing information. This preliminary action enables UEs to quickly identify potential base stations without waiting for the complete beamforming sweep, significantly reducing detection time while maintaining comprehensive coverage.
3Reliability
If exhaustive search methods are used for synchronization signal detection, then reliable detection is achieved, but detection efficiency decreases
Solution Approach 1:
The detection process is segmented into two stages: first detecting the narrowband synchronization signal which has broader detectability and provides cell ID information, then using that information to efficiently locate the wideband signal. This segmentation maintains detection reliability by ensuring proper cell identification while improving efficiency by eliminating exhaustive searches for the wideband signal.
Solution Approach 2:
The narrowband synchronization signal performs preliminary detection and provides cell ID and timing information that guides the subsequent detection of the wideband signal. This preliminary action ensures reliable detection by first establishing cell identity, then enabling targeted detection of the wideband signal at the specific frequency location determined from the NB-SS, significantly improving detection efficiency.
Data Source
AI summary
Methods, systems, and devices are described for directional synchronization signal signals in a millimeter wave communication system. A user equipment (UE) may receive a narrowband signal component of a synchronization signal for the millimeter wave communications. The narrowband signal component may include correlation information. The UE may use the correlation information to identify a wideband signal component of the synchronization signal for the millimeter wave communications. The UE may search frequencies associated with a first frequency location determined from the correlation information to identify and detect the wideband signal component of the synchronization signal.