PIM Cancellation Control Device for Wireless Scheduling
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Solution Overview
Problem
Current methods for handling passive intermodulation (PIM) in wireless communication systems are inefficient, particularly in multi-frequency band environments, leading to high hardware requirements and resource utilization challenges due to the complexity of PIM cancellation processing.
Innovation Solution
A control device and computer program that optimize PIM cancellation by scheduling interference control in network nodes, using a PIM analyzer and cancellation pool to determine regeneration coefficients and allocate resources efficiently, thereby reducing processing and signaling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PIM cancellation processing is implemented in multi-frequency band environments, then signal quality is improved, but processing complexity and hardware requirements increase
Solution Approach 1:
The patent segments the PIM cancellation processing by introducing a control device that separately manages scheduling decisions for multiple frequency bands. Instead of processing all bands simultaneously in one complex unit, the system divides the task into band-specific scheduling decisions coordinated by the control device, reducing overall processing complexity while maintaining signal quality across all bands
Solution Approach 2:
The control device performs preliminary scheduling actions by determining which user equipment should be scheduled in which frequency bands before actual PIM cancellation processing occurs. This advance planning optimizes resource allocation and reduces the complexity of real-time PIM cancellation by pre-organizing the signal processing workload
2Object-affected harmful factors
If PIM cancellation is performed for all frequency bands, then interference reduction is improved, but resource utilization deteriorates
Solution Approach 1:
The control device implements partial PIM cancellation by selectively applying interference reduction only to the frequency bands and user equipment that require it most. Rather than uniformly processing all bands, the system identifies specific instances where PIM cancellation is necessary and applies resources accordingly, optimizing the balance between interference reduction and resource utilization
3Productivity
If simultaneous transmission is allowed in multiple frequency bands, then productivity is improved, but passive intermodulation interference increases
Solution Approach 1:
The control device implements feedback-based scheduling by monitoring the PIM interference levels generated by simultaneous transmissions and adjusting future scheduling decisions accordingly. The system measures the actual interference produced by concurrent transmissions and uses this information to optimize subsequent transmission allocations, maintaining high productivity while controlling PIM interference through iterative refinement
Data Source
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AI summary
There is provided a method for controlling interference in a received signal when scheduling in a network node for wireless communication with a set of user equipment's, UEs, said set comprising a first UE and at least a second UE, wherein the interference is passive-intermodulation interference, PIM. The method comprises receiving a scheduling request from at least the first UE transmitting on a first frequency and scheduling at least the first UE based on an interference scenario report and available PIM cancellation resources to enable efficient PIM control. The method is performed by a control device.