Wireless Network Node Power Spectrum Shaping for Cell Search
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Solution Overview
Problem
In wireless communications networks, especially in flexible bandwidth scenarios, legacy UEs face challenges in initial cell search due to unclear indications of synchronization signals, leading to prolonged search times when the spectrum of signals from base stations does not match known bandwidths, especially in cases of carrier aggregation or when bandwidths are closely spaced.
Innovation Solution
A network node method that shapes the output power spectrum by boosting the power of synchronization signals within a legacy frequency bandwidth and decreasing power outside this bandwidth, allowing UEs to detect the synchronization signals more efficiently and reduce cell search time, thereby enabling improved cell search in flexible bandwidth scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spectrum of signals from base stations does not match known bandwidths (flexible bandwidth scenarios), then bandwidth flexibility is improved, but cell search time increases and detection reliability deteriorates
Solution Approach 1:
The network node performs preliminary shaping of the output power spectrum before signal transmission, creating a distinctive spectral pattern that enables UEs to quickly identify synchronization signals. By pre-configuring the spectrum shape with boosted synchronization signal regions and deboosted guard bands, the system prepares detection-friendly characteristics in advance, allowing legacy UEs to perform cell search efficiently even in flexible bandwidth scenarios without requiring new search algorithms.
Solution Approach 2:
The patent applies spectral shaping that modifies the 'color' or distribution of the signal spectrum by boosting power in specific frequency regions containing synchronization signals and decreasing power in guard band regions. This creates a distinctive spectral fingerprint that helps UEs rapidly identify and locate synchronization signals, analogous to how color changes help identify objects visually.
2Productivity
If carrier aggregation or closely spaced bandwidths are used, then spectrum utilization is improved, but synchronization signal detection becomes difficult
Solution Approach 1:
The network node applies localized power adjustments to specific frequency regions within the total bandwidth. Synchronization signal regions receive power boosting to enhance detectability, while guard band regions receive power deboosting to reduce interference. This local quality differentiation allows UEs to easily distinguish synchronization signals from other signal components, even when multiple carriers are aggregated or bandwidths are closely spaced.
Solution Approach 2:
The patent segments the total bandwidth into distinct functional regions: synchronization signal regions with boosted power for detection, data regions with normal power, and guard band regions with deboosted power. This segmentation creates clear boundaries and distinctive characteristics for each region, enabling UEs to efficiently locate and detect synchronization signals without confusion from adjacent carriers or closely spaced bandwidths.
3Reliability
If power is boosted in synchronization signal regions, then detection reliability is improved, but overall signal power distribution changes
Solution Approach 1:
The network node dynamically changes the power parameter in specific frequency regions through spectral shaping. By boosting power in synchronization signal regions and deboosting power in guard band regions, the system creates a controlled non-uniform power distribution that enhances detection reliability. The overall signal composition remains stable because the shaping is applied systematically across the bandwidth according to a predefined pattern that maintains total power balance.
Data Source
AI summary
A network node (840) and method therein for shaping an output power spectrum of a signal (920) to be transmitted in a wireless communications network are disclosed. The signal (920) is transmitted within a total frequency range or bandwidth comprising a first frequency bandwidth and a second frequency bandwidth. The network node increases or boosts a power of the signal (920) in a part of a first frequency bandwidth and/or decreases/deboosts a power of the signal (920) in a part of the total bandwidth outside the first frequency bandwidth. The network node then transmits the partly increased and/or decreased signal (920) to a wireless communication device (850) operating in the wireless communications network.