TDD Base Station Remote Interference Mitigation via Reference Signal Periodicity
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Solution Overview
Problem
Current cellular network technologies face challenges in efficiently managing remote interference between base stations, particularly in time division duplex (TDD) networks, especially due to atmospheric ducting phenomena that can cause increased cross-link interference, leading to degraded system performance.
Innovation Solution
A method is introduced to determine a set of radio resources for reference signals (RSs) to handle remote interference, allowing for the transmission and reception of RSs only in specific occasions, and providing a mechanism to restrict or disable a subset of possible RS resources, thereby mitigating cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are transmitted in every TDD DL-UL switch point to handle remote interference, then interference management capability is improved, but network resource consumption increases
Solution Approach 1:
The patent implements periodic transmission of RIM-RS at specific intervals rather than continuously at every switch point. The network configures periodic RIM-RS resources that are activated only when remote interference is detected, allowing the system to maintain interference management capability while significantly reducing overall resource consumption during normal operation.
Solution Approach 2:
The patent introduces dynamic configuration of RIM-RS resources where the network can adjust the periodicity and activation of reference signals based on current interference conditions. When atmospheric ducting or other RI conditions are detected, the system dynamically increases monitoring frequency; otherwise, it reduces resource usage by lowering the periodicity or disabling RIM-RS transmission entirely.
2Measurement precision
If RIM-RS is transmitted at every DL-UL switch point, then remote interference detection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by transmitting RIM-RS only at selected DL-UL switch points rather than all switch points. The network configures a subset of switch points where RIM-RS transmission occurs, focusing measurement resources on critical moments when remote interference is most likely to occur, thereby maintaining detection accuracy while reducing signaling overhead.
Solution Approach 2:
The patent changes the temporal parameter of RIM-RS transmission from continuous (every switch point) to periodic (configurable intervals). By adjusting the periodicity parameter, the system can optimize between detection accuracy and signaling overhead based on current network conditions and interference patterns.
3Reliability
If multiple RIM-RS resources are configured for multiplexing in frequency domain, then interference handling capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the interference handling function across multiple frequency-domain RIM-RS resources. Each resource is configured for specific interference scenarios or geographic directions, allowing the base station to activate only the relevant segment based on current interference conditions. This segmentation reduces overall device complexity by enabling selective activation rather than requiring full processing capability for all resources simultaneously.
Data Source
AI summary
A method of handling a remote interference (RI) between base stations of a time division duplex (TDD) network is provided. The method comprises or initiates a step of determining a set of radio resources for reference signals (RSs) for handling the RI. The method further comprises or initiates a step of handling the RI by at least one of transmitting and receiving one or more RSs using the radio resources of the determined set.