FMCW Synchronization Signals for Low-Power Cell Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing cell search and synchronization for user equipment (UEs) with limited wideband processing capabilities, leading to increased computational resource expenditure and power consumption.
Innovation Solution
The use of frequency modulated continuous wave (FMCW) synchronization signals, transmitted as low-complexity waveforms, allows UEs to perform cell detection and synchronization without increasing network resource expenditure, using FMCW bursts at a first periodicity and SSB bursts at a second periodicity, enabling efficient cell detection and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wideband processing methods are used for cell search and synchronization, then detection performance is maintained, but computational resource expenditure and power consumption increase
Solution Approach 1:
The patent segments the synchronization process into two distinct phases: coarse synchronization using FMCW signals with simplified processing, and fine synchronization using traditional methods. This segmentation allows UEs to perform initial cell search with low computational overhead, reserving high-power wideband processing only when necessary, thereby reducing overall power consumption while maintaining detection performance.
Solution Approach 2:
The patent replaces the traditional mechanical wideband processing system with an FMCW-based system for coarse synchronization. FMCW signals use frequency modulation instead of wideband time-domain processing, substituting a computationally intensive mechanical processing system with a more efficient frequency-domain approach that requires fewer computational resources and less power.
2Measurement precision
If traditional wideband processing methods are used for cell search and synchronization, then detection performance is maintained, but computational resource expenditure increases
Solution Approach 1:
The patent segments the synchronization process into two distinct phases: coarse synchronization using FMCW signals with simplified processing, and fine synchronization using traditional methods. This segmentation allows UEs to perform initial cell search with low computational overhead, reserving high-power wideband processing only when necessary, thereby reducing overall power consumption while maintaining detection performance.
Solution Approach 2:
The patent replaces the traditional mechanical wideband processing system with an FMCW-based system for coarse synchronization. FMCW signals use frequency modulation instead of wideband time-domain processing, substituting a computationally intensive mechanical processing system with a more efficient frequency-domain approach that requires fewer computational resources and less power.
3Use of energy by moving object
If FMCW synchronization signals are used, then computational and power consumption at UEs is reduced, but signaling overhead must be managed
Solution Approach 1:
The patent makes FMCW synchronization signals multi-functional by designing them to simultaneously carry coarse synchronization information and cell identification data. This universality allows a single signal type to perform multiple functions that traditionally required separate signaling mechanisms, thereby reducing overall signaling overhead while maintaining low UE power consumption.
Solution Approach 2:
The patent merges the coarse synchronization function and cell search function into a single FMCW-based process. By combining these functions that were traditionally performed separately, the system reduces the total amount of signaling required while keeping UE computational and power requirements low.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces computational and power consumption at UEs while maintaining detection performance, decreases signaling overhead, and enhances user experience by allowing low-complexity cell detection and synchronization.
Implementation Method 1
frequency modulated continuous wave (FMCW) synchronization signals, transmitted as low-complexity waveforms
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may transmit a pre-synchronization signal (SSB) signal using a low complexity waveform (e.g., a frequency modulated continuous wave (FMCW)). The UE may perform cell detection and coarse synchronization upon receiving FMCWs. The network entity may transmit FMCWs (e.g., pre-SSB FMCW transmissions) over a set of raster points in the frequency domain according to a first periodicity, and may transmit SSBs (e.g., including SSSs and a PBCH, but no PSS) at a second periodicity. The UE may perform FMCW burst detection procedures to receive the FMCWs. The UE may therefore perform low-complexity cell detection and synchronization without increasing resource expenditures by the network entity, resulting in efficient cell detection and synchronization, decreased power expenditures by the UE, decreased signaling overhead by the network entity, and improved user experience.