Small-Cell Base Station Spectrum Mode Selection
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Solution Overview
Problem
In wireless cellular networks with overlapping coverage of large-cell and small-cell networks, the shared spectrum mode leads to higher interference, reducing network capacity and spectrum utilization efficiency, while using different spectrums results in less available resources and lower efficiency.
Innovation Solution
A method to determine a Reference Signal Received Power (RSRP) threshold to decide between a shared spectrum mode and a separate spectrum mode based on the distance or RSRP between small-cell and large-cell base stations, optimizing spectrum usage by switching to separate spectrum mode when close to reduce interference and to shared spectrum mode when farther to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the large-cell network and small-cell network adopt the same spectrum (shared spectrum mode), then more spectrum resources are available for each network, but greater shared-channel interference arises between the two networks, decreasing network capacity and spectrum utilization efficiency
Solution Approach 1:
The patent applies dynamics by making the spectrum mode selectable and changeable rather than fixed. The system can dynamically switch between shared spectrum mode and separate spectrum mode based on real-time conditions such as interference levels, network load, and coverage requirements, allowing optimal performance under varying operational scenarios
Solution Approach 2:
The patent changes the spectral parameter from a fixed state to a variable state. By allowing the spectrum allocation parameter to switch between shared and separate modes, the system can adjust the degree of spectrum sharing based on operational needs, thereby optimizing the balance between resource availability and interference management
2Object-generated harmful factors
If the large-cell network and small-cell network adopt different spectrums (separate spectrum mode), then less shared-channel interference exists between the two networks, but each wireless network has less available spectrum resources, decreasing network capacity and spectrum utilization efficiency
Solution Approach 1:
The system dynamically adjusts spectrum allocation based on real-time conditions. When interference levels are high or network load is low, the system can switch to separate spectrum mode to reduce interference. When interference is manageable and resource availability is critical, it switches to shared spectrum mode to maximize resource utilization
Solution Approach 2:
The spectrum allocation parameter is made variable, allowing the system to switch between different spectral configurations. This parameter change enables the system to optimize the trade-off between interference reduction and resource availability based on operational requirements
3Area of stationary object
If small-cell base stations are deployed in hotspot areas and indoors with lower transmission power, then wireless transmission coverage is improved in specific areas, but overlapping coverage with macrocells creates interference in the overlapped coverage areas
Solution Approach 1:
The patent applies local quality by allowing different spectrum modes in different spatial locations. Small-cell base stations in hotspot areas or indoors can operate in separate spectrum mode to minimize interference with macrocells, while macrocells in coverage extension areas can use shared spectrum mode to maximize resource utilization, creating location-specific optimization
Solution Approach 2:
The system dynamically determines the appropriate spectrum mode for each small-cell base station based on its location, coverage overlap with macrocells, and local traffic conditions. This dynamic approach allows the network to adapt to varying interference scenarios across different geographical areas
Data Source
AI summary
The present invention discloses a method of spectrum utilization in a wireless cellular environment with coverage of at least two wireless networks and a related apparatus. The method includes: determining a RSRP threshold; detecting, by a small-cell base station, RSRPs of at least one large-cell base station; and comparing the highest one of the detected RSRPs with the determined RSRP threshold, adopting a separate spectrum mode if the highest one of the detected RSRPs exceeds the determined RSRP threshold, and otherwise, adopting a shared spectrum mode. According to the method and apparatus of the present invention, a separate spectrum mode is adopted when the small-cell base station is relatively close to the large-cell base station to decrease interferences between the small-cell base station and large-cell base station and to increase spectrum usage efficiency in the wireless cellular environment with coverage of at least two wireless networks, however, a shared spectrum mode is adopted when the small-cell base station is relatively far from to the large-cell base station to realize sharing spectrum and increase spectrum usage efficiency in the wireless cellular environment with coverage of at least two wireless networks.