Dynamic CSI-RS Allocation for Interference and Resource Trade-offs
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Solution Overview
Problem
Current interference avoidance techniques for CSI-RS in wireless communication systems, such as ZP-CSI-RS allocation, lead to resource underutilization and increased overhead, especially in dynamic radio environments where adjacent cell interference varies.
Innovation Solution
A dynamic CSI-RS allocation technique that includes an interference report receiver and controller to manage reference signal information across distributed units, allowing for real-time allocation of interference avoidance signals like ZP-CSI-RS, minimizing resource usage decrease and interference between CSI-RS and PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ZP-CSI-RS is allocated to avoid interference between RS and PDSCH, then interference is minimized, but resources usable for data transmission decrease and overhead increases
Solution Approach 1:
The patent implements dynamic ZP-CSI-RS allocation where the base station determines allocation based on real-time interference reports from UEs. The allocation is not static but adapts to changing radio conditions, allocating ZP-CSI-RS only when and where interference is detected, thereby minimizing resource wastage while still protecting against harmful interference.
Solution Approach 2:
The patent applies ZP-CSI-RS allocation locally rather than globally. Instead of allocating ZP-CSI-RS across the entire bandwidth, the base station identifies specific resource locations where interference occurs and allocates ZP-CSI-RS only in those localized areas, preserving resources in interference-free regions for data transmission.
2Reliability
If ZP-CSI-RS is allocated to prevent interference, then transmission reliability improves, but overhead increases
Solution Approach 1:
The patent applies partial action by allocating ZP-CSI-RS only in specific resource locations where interference is detected, rather than allocating it universally. This partial allocation maintains transmission reliability in affected areas while minimizing overall overhead by leaving other resources available for data transmission.
3Device complexity
If CRS is used for channel state identification, then channel estimation is simplified, but network configuration flexibility is restricted and energy efficiency decreases
Solution Approach 1:
The patent transitions from using CRS to using CSI-RS for channel state identification. This parameter change in the reference signal type enables better adaptability to different frequency bands (including high-frequency bands >= 6 GHz) and MIMO configurations, while the base station maintains control over channel estimation through configured CSI-RS resources and reporting mechanisms.
Data Source
AI summary
The disclosure implements a dynamic CSI-RS allocation technique that minimizes a decrease in resources usable for data transmission due to overuse of LP-CSI-RS allocation, and also minimizes interference between an RS and a PDSCH, in consideration of a radio environment that dynamically varies.