Dynamic CSI-RS Resource Location Configuration for 5G NR Interference
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Solution Overview
Problem
In 5G New Radio (NR) systems, especially at millimeter wave frequencies, channel state information reference signals (CSI-RS) for Layer 3 mobility measurement are vulnerable to interference due to fixed locations, leading to reduced measurement performance and increased interference with other cellular resources.
Innovation Solution
A method and system that dynamically change the sequence of resource locations for CSI-RS, using resource and network identifying information, and configured parameters to randomize the timing and frequency of CSI-RS, reducing collisions with other signals and enhancing mobility measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed resource locations are used for CSI-RS, then device complexity is reduced and ease of operation is improved, but interference increases and measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the resource locations of CSI-RS changeable over time rather than fixed. The network can dynamically adjust the time-frequency resource positions of CSI-RS signals, allowing the system to adapt to varying interference conditions and improve measurement precision by avoiding persistent collision patterns with other signals.
Solution Approach 2:
The patent changes the parameters of CSI-RS resource locations in the time and frequency domains. By modifying these parameters dynamically, the system can shift CSI-RS transmissions to less interfered resource positions, thereby reducing harmful interference effects while maintaining measurement accuracy.
2Measurement precision
If measurement gaps are extended to improve CSI-RS measurement reliability, then measurement precision improves, but productivity decreases due to longer interruption of data transmission
Solution Approach 1:
The patent makes measurement gap configuration dynamic by allowing the network to adjust gap duration and timing based on actual CSI-RS resource locations and interference conditions. This enables optimization of measurement reliability while minimizing impact on data transmission productivity, as gaps can be shortened or shifted when interference is reduced through dynamic resource allocation.
Solution Approach 2:
The system performs self-optimization by automatically adjusting measurement gap configurations based on the dynamic CSI-RS resource locations. The network can autonomously determine appropriate gap timings without manual intervention, balancing measurement needs with data transmission requirements to maintain overall system productivity.
3Object-affected harmful factors
If dynamic resource locations are used for CSI-RS, then interference is reduced and measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors interference conditions and measurement results, then adjusts CSI-RS resource locations accordingly. This closed-loop approach allows the system to achieve reduced interference and improved measurement precision while managing complexity through automated feedback-driven adjustments rather than exhaustive search or manual configuration.
Data Source
AI summary
A method operating an access node includes determining a sequence of resource locations of a reference signal in accordance with resource identifying information and network identifying information, wherein at least a subset of resource locations in the sequence of resource locations changes, and sending, by the access node, the reference signal in accordance with the sequence of resource locations.