Downlink Interference Detection via Empty Resource Block Analysis
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Solution Overview
Problem
Wireless network operators face interference from unlicensed users, leading to poor performance and reduced throughput in licensed cellular networks, necessitating a method to detect and characterize downlink interference effectively.
Innovation Solution
A method involving selecting user equipment to measure interference, generating downlink interference neighbor lists, identifying empty resource blocks, and analyzing signals during these blocks to detect and characterize interference, allowing for the allocation of base station resources to mitigate interference without explicitly scheduling quiet times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cellular network uses all available spectrum resources for data transmission, then network capacity and throughput are maximized, but interference from unlicensed users cannot be detected and performance degrades
Solution Approach 1:
The system performs preliminary actions by having base stations pre-calculate and share transmission matrices before actual data transmission. These matrices predict which resource blocks will be empty, allowing user equipment to proactively measure interference in advance. This preliminary measurement capability enables the network to detect potential interference sources before they degrade call quality, while maintaining full spectrum utilization during normal operation.
Solution Approach 2:
User equipment performs self-service by autonomously measuring downlink interference on empty resource blocks identified through transmission matrix analysis. The UE independently evaluates interference levels and reports findings to the network, eliminating the need for dedicated network-controlled measurement slots. This self-service approach maintains network capacity while enabling reliable interference detection for quality assurance.
2Measurement precision
If dedicated quiet times are scheduled for interference measurement, then interference detection accuracy is improved, but network capacity and spectral efficiency are reduced
Solution Approach 1:
The invention extracts the interference measurement function from dedicated quiet time slots and relocates it to naturally occurring empty resource blocks. By separating the measurement requirement from scheduled silence periods and utilizing already-empty blocks identified through transmission matrix analysis, the system achieves accurate interference detection without sacrificing spectral efficiency or network capacity.
Solution Approach 2:
Empty resource blocks serve multiple functions simultaneously: they act as both data transmission resources (when needed) and interference measurement opportunities (when identified as empty). This multi-functionality eliminates the need for dedicated measurement slots, as the same resource blocks fulfill dual purposes, thereby maintaining spectral efficiency while enabling precise interference detection.
3Adaptability or versatility
If transmission matrices are calculated and shared among all base stations, then coordination for identifying empty resource blocks is improved, but system complexity and signaling overhead increase
Solution Approach 1:
A centralized controller acts as an intermediary to manage transmission matrix calculations and coordinate empty resource block identification across the network. Rather than requiring complex peer-to-peer communication between all base stations, the controller receives transmission matrices from individual base stations, processes them centrally to identify common empty blocks, and distributes the results. This intermediary approach simplifies system architecture and reduces signaling overhead while maintaining effective coordination.
Data Source
AI summary
A method of detecting downlink interference in a communications system may include selecting a set of user equipment for measuring interference and generating a downlink interference neighbor list for some or all of the user equipment in the set. Empty resource blocks that are common to base stations on each downlink interference neighbor list are identified, and signals that are received by the set of user equipment during the empty resource blocks are analyzed to detect interference. Certain aspects of the method may be practiced before or after an interference detection period. A system for detecting downlink interference is also provided.