Base Station Scheduling for Passive Intermodulation Interference
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Solution Overview
Problem
Passive intermodulation signals generated by interactions between downlink signals in communications systems cause interference to uplink receive signals due to analog components or external metal components, leading to performance degradation.
Innovation Solution
A scheduling method and apparatus for a base station that predicts interference impact from passive intermodulation signals and performs resource scheduling in both frequency and space domains to minimize interference, including determining optimal scheduling units and applying spatial filtering to suppress interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink signals are transmitted using analog components and external metal components, then signal transmission is achieved, but passive intermodulation signals are generated causing interference to uplink receive signals
Solution Approach 1:
The base station predicts interference impact from passive intermodulation signals before performing resource scheduling. By calculating predicted interference between downlink signals and uplink signals in advance, the system identifies scheduling units with lower interference impact, thereby preventing interference issues before they occur rather than reacting after interference is generated
Solution Approach 2:
The patent applies different scheduling strategies to different scheduling units based on their specific interference characteristics. By identifying scheduling units with lower predicted interference impact and prioritizing them, the system creates localized optimization in specific time-frequency resources rather than applying uniform scheduling across all resources
2Device complexity
If resource scheduling is performed without considering predicted interference, then scheduling simplicity is maintained, but system performance degrades due to interference from passive intermodulation signals
Solution Approach 1:
The base station performs preliminary calculation of predicted interference between downlink and uplink signals before scheduling decisions are made. This advance calculation enables the system to identify low-interference scheduling units in advance, allowing simple selection of optimal resources without complex real-time interference management during actual transmission
Solution Approach 2:
The scheduling system uses its own predicted interference calculations to automatically identify and select optimal scheduling units. The base station serves itself by using the predicted interference information to make autonomous scheduling decisions, prioritizing scheduling units with lower predicted interference impact without requiring external intervention or complex coordination
3Object-affected harmful factors
If frequency domain resource scheduling is applied, then interference suppression in frequency domain is achieved, but space domain resource optimization is not utilized
Solution Approach 1:
The patent extends interference suppression from a single frequency domain dimension to both frequency domain and space domain dimensions. By performing resource scheduling in both frequency domain (selecting scheduling units with lower interference impact) and space domain (using spatial filtering with antenna arrays), the system achieves multi-dimensional interference suppression and more comprehensive resource optimization
4Reliability
If spatial filtering is applied to suppress interference, then uplink signal quality improves, but processing complexity increases
Solution Approach 1:
The base station performs preliminary identification of scheduling units with lower predicted interference impact before applying spatial filtering. By pre-selecting scheduling units that are less susceptible to passive intermodulation interference, the system reduces the burden on spatial filtering processing, as less severe interference requires less aggressive filtering and preserves more signal quality
Data Source
AI summary
Embodiments of this application provide a scheduling method and apparatus, and relate to the communications field. The method includes: Abase station obtains information about predicted interference of N downlink signals of the base station to an uplink signal, where N is an integer greater than 1, and the information about predicted interference is used to indicate predicted interference impact, on the uplink signal, of passive intermodulation signals generated by interaction between the N downlink signals. Then, the base station may perform resource scheduling on the N downlink signals and/or the uplink signal based on the obtained information about predicted interference, where the resource scheduling includes frequency domain resource scheduling and space domain resource scheduling. In this application, the interference impact of the passive intermodulation signals can be effectively reduced, thereby improving system performance and radio resource utilization.