Wireless Scheduler Minimizing Passive Intermodulation
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Solution Overview
Problem
Passive intermodulation (PIM) distortion in wireless communication systems interferes with intended signals, limiting capacity and range, and higher-order PIM products exacerbate performance degradation, particularly in frequency duplex division (FDD) systems.
Innovation Solution
A scheduler is developed that maintains information associating resource blocks with their PIM impact and schedules them to minimize PIM interference by prioritizing resource blocks with no PIM impact or adjusting transmission power based on PIM severity, using both measurement results and predefined information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource blocks are scheduled without considering PIM impact, then scheduling simplicity is maintained, but PIM distortion interferes with intended signals limiting capacity and range
Solution Approach 1:
The system performs preliminary actions by pre-defining information indicating PIM impact for each resource block before scheduling occurs. The scheduler maintains this information and uses it during the scheduling process to select resource blocks that minimize PIM distortion, thereby proactively preventing interference rather than reacting to it after the fact.
Solution Approach 2:
The patent applies local quality by associating different PIM impact characteristics with different resource blocks. Instead of treating all resource blocks uniformly, the system identifies specific resource blocks with lower PIM impact and prioritizes their allocation, thereby applying quality differentiation at the local resource block level to reduce overall PIM distortion.
2Reliability
If resource blocks with no PIM impact are prioritized, then PIM interference is reduced, but scheduling complexity increases due to maintaining and accessing PIM impact information
Solution Approach 1:
The scheduler performs preliminary action by maintaining pre-defined information indicating PIM impact for each resource block before the actual scheduling decision is made. This pre-computed information is stored and readily accessible during scheduling, eliminating the need for complex real-time PIM calculations and reducing scheduling complexity while ensuring reliable signal quality.
Solution Approach 2:
The patent substitutes complex mechanical PIM impact calculation mechanisms with a simplified information-based system. Instead of performing complex physical calculations during scheduling, the system uses pre-defined PIM impact information to guide resource block selection, thereby reducing scheduler complexity while maintaining signal quality through information-driven decision-making.
3Object-affected harmful factors
If downlink power is adjusted based on PIM impact, then PIM distortion is minimized, but energy consumption increases due to continuous power adjustment
Solution Approach 1:
The system applies local quality by adjusting downlink power specifically for resource blocks identified as having high PIM impact, rather than uniformly adjusting power across all resource blocks. This targeted power adjustment minimizes PIM distortion in critical areas while conserving energy in areas where PIM impact is already low, thereby reducing overall energy consumption.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the downlink power parameter based on the PIM impact characteristics of each resource block. The scheduler modifies power levels according to pre-defined PIM impact information, changing the power parameter locally for specific resource blocks to minimize PIM distortion while optimizing overall energy consumption through selective adjustment.
Data Source
AI summary
To take into account a passive intermodulation, resource blocks are associated with information indicating passive intermodulation impact of a corresponding resource block. The resource blocks are scheduled using the information.