Configurable Synchronization Signal Design for 5G Networks
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Solution Overview
Problem
Next-generation 5G LTE networks face challenges in synchronizing user equipment (UEs) across diverse and conflicting performance requirements, necessitating flexible synchronization signals to enhance compatibility and efficiency.
Innovation Solution
The implementation of configurable synchronization signals and channels, including a primary synchronization signal (xPSS) and secondary synchronization signal (xSSS), within a reduced bandwidth, utilizing Zadoff-Chu sequences and cyclic extensions, allows UEs to synchronize with the network without prior knowledge of allocated bandwidth, minimizing intercarrier interference and improving link budget through PSD boosting and beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronization signals are designed with fixed bandwidth allocation, then network synchronization can be achieved, but flexibility to meet diverse service requirements is lost
Solution Approach 1:
The patent implements dynamic synchronization signal design where the bandwidth allocation, subcarrier spacing, and signal parameters can be adjusted based on service requirements. The system allows flexible configuration of xPSS and xSSS with variable bandwidths (e.g., 5%, 10%, 20% of total bandwidth) and different subcarrier spacings (15kHz, 30kHz, 60kHz) to adapt to diverse 5G services while maintaining manageable complexity through standardized configuration sets.
Solution Approach 2:
The patent changes key parameters of synchronization signals including bandwidth allocation ratios, subcarrier spacing values, and cyclic prefix lengths to meet different service requirements. By defining configurable parameter sets that can be selected based on service type (e.g., eMBB, uRLLC, mMTC), the system achieves versatility without requiring complete redesign for each service scenario.
2Object-affected harmful factors
If reduced bandwidth is used for synchronization signals, then intercarrier interference is minimized, but synchronization coverage area is reduced
Solution Approach 1:
The patent applies different bandwidth allocations and power spectral density boosting strategies to different frequency regions and cell types. By allowing localized optimization where reduced bandwidth signals are used in dense urban areas with small coverage cells, while larger bandwidth signals serve rural areas with extended coverage needs, the system minimizes intercarrier interference where necessary while maintaining adequate coverage elsewhere.
3Reliability
If power spectral density boosting is applied, then link budget is improved, but power consumption increases
Solution Approach 1:
The patent applies power spectral density boosting selectively rather than uniformly across all synchronization signals. By boosting PSD only for specific signal types (e.g., xPSS) or in specific scenarios (e.g., cell edge coverage requirements) while using standard power levels for others (e.g., xSSS), the system achieves sufficient link budget improvement for critical functions while minimizing overall power consumption.
Data Source
AI summary
Devices and methods of using xSS are generally disclosed. A UE receives an xPSS with (Nrep) symbols each with a subcarrier spacing of K x a PSS subcarrier spacing and a duration of a PSS symbol/K. PSD subcarriers surround the xPSS and the ZC sequence is punctured to avoid transmission on a DC subcarrier. Guard subcarriers separate the xPSS and PSD when the ZC sequence is less than the occupied BW of the xPSS and at least one element in the ZC sequence is punctured for xPSS symbol generation otherwise. One or more xSSSs and xS-SCHs may follow the xPSS. The xSS may be omnidirectional, each having a same xPSS and different xSSS or xS-SCH or a different xPSS and same xSSS or xS-SCH or beamformed, each having different xPSSs and xSSSs or xS-SCHs or a same xPSS and different xSSS or xS-SCH.