Dynamic Spectrum Sharing Interference Mitigation
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Solution Overview
Problem
The transition from legacy 4G wireless networks to 5G networks poses challenges due to radio link interference, particularly from 4G LTE carriers to 5G NR carriers, leading to significant spectral efficiency loss, especially in dual connectivity scenarios where both technologies share the same RF frequency but operate in different time and/or frequency domains.
Innovation Solution
Implementing dynamic spectrum sharing (DSS) between 4G LTE and 5G NR, where resources are dynamically allocated within the same RF frequency but in different time and/or frequency domains, and using advanced interference mitigation techniques such as CSI-IM measurements and dynamic activation/deactivation of zero-power resource sets to minimize LTE CRS interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 4G LTE and 5G NR share the same RF frequency band, then spectrum utilization is improved, but radio link interference occurs between the two technologies
Solution Approach 1:
The patent segments the shared RF frequency band into separate time and frequency resources for 4G LTE and 5G NR operations. By dividing the spectrum into distinct resource blocks and time slots, the system allows both technologies to operate simultaneously without mutual interference, thus resolving the contradiction between spectrum utilization and interference prevention
Solution Approach 2:
The patent implements dynamic resource allocation where 4G and 5G resources can be flexibly adjusted based on traffic demands and interference conditions. The system dynamically switches between 4G and 5G resource configurations in different time slots and frequency bands, enabling adaptive spectrum sharing that maximizes utilization while minimizing interference
2Productivity
If dynamic spectrum sharing is implemented between 4G and 5G, then spectral efficiency is improved, but system complexity increases due to resource management requirements
Solution Approach 1:
The patent pre-configures 4G and 5G resource patterns, including resource block assignments, time slot structures, and reference signal positions, before actual data transmission. This preliminary configuration allows the system to quickly switch between 4G and 5G modes without complex real-time calculations, reducing management complexity while maintaining high spectral efficiency
Solution Approach 2:
The patent implements feedback mechanisms where user equipment reports channel quality, interference levels, and resource utilization metrics to the base station. This feedback enables the system to dynamically adjust 4G/5G resource allocation based on actual conditions, optimizing spectral efficiency while keeping resource management tractable through data-driven decisions
3Reliability
If LTE CRS signals are transmitted continuously, then 4G coverage is maintained, but interference to 5G NR signals increases
Solution Approach 1:
The patent employs periodic transmission of LTE CRS signals instead of continuous transmission. By scheduling CRS signals in specific time slots and subframes, the system maintains 4G coverage reliability when needed while creating interference-free periods for 5G NR operations, thus resolving the contradiction between coverage reliability and interference prevention
Solution Approach 2:
The patent resolves the interference issue by separating 4G LTE CRS transmissions and 5G NR signals in the time-frequency domain. By allocating different time slots, frequency bands, and resource blocks to each technology, the system maintains 4G coverage while eliminating CRS interference to 5G, effectively adding dimensional separation to the resource allocation
Data Source
AI summary
Systems and methods provide for determining whether a user device is experiencing interference; attempting to identify a source of the interference based on determining that the user device is experiencing interference; initiating a timer in response to determining that the user device is experiencing interference; determining whether the source of the interference was identified before the timer expires; and dynamically mitigating the interference based on identifying the source of the interference before the timer expires.