Dynamic Guard Band Allocation for Wireless Spectrum Sharing
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Solution Overview
Problem
In dynamic spectrum sharing, the existing methods for guard band allocation between different radio access technologies (RATs) or bandwidth parts (BWPs) often result in a fixed guard band size, leading to inefficient spectrum resource utilization due to unnecessary waste, as the required guard band size varies based on tolerable interference levels which depend on scheduling results.
Innovation Solution
A method where network nodes dynamically determine the guard band size based on interference plus noise power, modulation and coding scheme (MCS), and physical resource block (PRB) number, ensuring that the interference on terminal devices remains below tolerable levels, allowing for flexible allocation that adapts to scheduling results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed guard band size is used in spectrum sharing, then interference between adjacent frequency bands is reduced, but spectrum resource utilization efficiency deteriorates due to unnecessary waste
Solution Approach 1:
The patent applies dynamics by making the guard band size adjustable rather than fixed. The network node dynamically determines the guard band size based on scheduling results, terminal device locations, and interference conditions. This allows the system to adapt the guard band width in real-time, reducing spectrum waste when interference is low while maintaining adequate protection when interference is high, thus resolving the contradiction between reliability and resource efficiency
Solution Approach 2:
The patent changes the parameter of guard band size from a fixed value to a variable determined by scheduling outcomes. By calculating the required guard band size based on terminal device positions, subcarrier spacing differences, and interference plus noise power, the system optimizes the guard band parameter to balance interference reduction with spectrum resource utilization, preventing unnecessary spectral waste
2Object-affected harmful factors
If a larger guard band is allocated, then interference between different RATs or BWPs is reduced, but spectrum resource utilization deteriorates
Solution Approach 1:
The system dynamically adjusts the guard band size based on actual interference conditions and scheduling requirements. When terminal devices are located away from band edges or when subcarrier spacing differences are small, the required guard band is reduced, allowing more spectrum to be utilized for data transmission. This dynamic approach maintains interference protection while maximizing spectrum productivity
Solution Approach 2:
The guard band size parameter is changed from a conservative fixed value to an optimized variable. The network node calculates the minimum required guard band based on terminal positions, subcarrier spacing, and interference conditions, adjusting the parameter to achieve the lowest acceptable interference level while maximizing usable spectrum, thus improving overall system productivity
3Productivity
If a fixed small guard band is used, then spectrum resource utilization is improved, but interference on terminal devices may exceed tolerable levels
Solution Approach 1:
The system implements feedback by continuously monitoring terminal device positions, scheduling results, and interference conditions. Based on this feedback, the network node recalculates and adjusts the guard band size to ensure interference remains below tolerable levels for all terminal devices. This feedback mechanism allows the system to maintain high spectrum utilization while providing adequate interference protection when needed
Solution Approach 2:
The guard band size parameter is adjusted based on calculated interference levels and terminal device tolerances. When terminal devices are positioned near band edges or when scheduling indicates high susceptibility to interference, the guard band is expanded to keep interference below tolerable thresholds, thereby maintaining both productivity and interference control
Data Source
AI summary
The present disclosure provides a method (100) at a first network node and a method (300) at a second network node. The method (100) at the first network node comprises performing (110) scheduling in a first frequency band and providing (120) information related to a result of the scheduling to the second network node. The method (300) at the second network node comprises obtaining (310) information related to a result of scheduling by the first network node in a first frequency band and determining (320), based at least on the information, a size of a guard band between the first frequency band and a second frequency band to be scheduled by the second network node.