Access Node Interference Mitigation via Beam Scheduling
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Solution Overview
Problem
Telecommunication systems face interference issues due to beamforming techniques, which can degrade service quality for wireless devices, especially when grating lobe interference goes undetected.
Innovation Solution
The system monitors packet reception rates and retransmission metrics at access nodes to detect interference from neighboring cells and adjusts beamformed signal transmissions to mitigate grating lobe interference by identifying and terminating beamformed signals to specific devices, and schedules transmissions to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming techniques are used to serve wireless devices with poor signal conditions, then service quality for devices with poor signal conditions is improved, but interference is caused to other communications between the access node and wireless devices
Solution Approach 1:
The system segments the communication problem by identifying and isolating specific interfering beamformed transmissions to specific wireless devices. By detecting packet error rates and retransmission metrics for individual devices, the system can target and mitigate interference for affected devices without disrupting beamforming service to other devices, thus resolving the contradiction between improving service for poor signal devices and preventing interference to others.
Solution Approach 2:
The system changes operational parameters by adjusting or terminating specific beamformed transmissions based on detected interference conditions. When interference is detected through packet error rate monitoring, the system modifies transmission parameters (such as stopping beamformed transmissions to certain devices or adjusting beamforming weights) to eliminate harmful interference while preserving beneficial beamforming effects for other devices.
2Reliability
If beamformed signals are transmitted to improve signal conditions, then wireless service quality is enhanced, but grating lobe interference occurs that degrades service for other devices
Solution Approach 1:
The system implements feedback mechanisms by monitoring packet error rates and retransmission metrics from wireless devices. This feedback allows the access node to detect when grating lobe interference is affecting specific devices, enabling the system to respond by adjusting or terminating problematic beamformed transmissions, thus maintaining service quality while eliminating harmful grating lobe effects.
Solution Approach 2:
The system extracts and identifies specific beamformed transmissions that are causing grating lobe interference. By monitoring individual device performance metrics, the system can isolate the problematic transmissions from the overall beamforming operation, allowing it to remove only the harmful elements while preserving the beneficial beamforming service for other devices.
3Reliability
If interference detection and mitigation mechanisms are implemented, then service quality for affected devices is improved, but system complexity increases
Solution Approach 1:
The system employs self-service mechanisms where wireless devices themselves provide interference detection data through their packet error rate and retransmission metrics. The access node uses this self-reported information from devices to identify interference problems, eliminating the need for complex centralized interference detection infrastructure while still achieving effective interference mitigation for affected devices.
Data Source
AI summary
Systems and methods are also described for mitigating interference at an access node. It may be determined, based on an interference metric for a first wireless device exceeding an interference criteria, that communication between the first wireless device and a cell of an access node is experiencing interference from a neighboring cell. A second wireless device receiving a beamformed transmission may be identified, wherein the beamformed transmission to the second wireless device is identified as an interference source for communication between the first wireless device and the cell of the access node. Transmissions to the first wireless device and the second wireless device may be scheduled such that the scheduled timings for transmissions to the first wireless device are different from the scheduling timings for transmissions to the second wireless device.