Null Resource Elements for Dynamic Interference Measurement in 5G NR
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Solution Overview
Problem
Current interference measurement techniques in 5G new radio (NR) networks are inadequate for dynamic and bursty inter-cell interference conditions, leading to overconservative scheduling decisions that negatively impact system throughput, especially in ultra-low latency applications.
Innovation Solution
The use of null resource elements, such as zero power resource elements, for on-the-fly interference estimation at demodulation time, enabling symbol-wise and subband-wise estimation, and data-aided interference measurement techniques to improve interference awareness and scheduling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long-term interference measurements (CSI-RS or IMR) are used, then interference measurement coverage is provided, but scheduling decisions become overconservative and system throughput decreases
Solution Approach 1:
The patent segments interference measurement into two distinct components: long-term interference measurement (using CSI-RS/IMR) and dynamic bursty interference measurement (using null resource elements). This segmentation allows each measurement type to serve its specific purpose - long-term for baseline coverage and dynamic for real-time scheduling decisions, thereby resolving the contradiction between measurement coverage and throughput optimization.
Solution Approach 2:
The patent introduces dynamic interference measurement using null resource elements that can be configured and activated adaptively based on traffic conditions. This dynamic approach allows the system to transition from static long-term measurements to real-time interference assessment, enabling scheduling decisions that respond to actual interference conditions rather than relying on conservative long-term averages.
2Reliability
If fast scheduling coordination among scheduling entities is implemented, then bursty interference control is improved, but processing time and complexity increase
Solution Approach 1:
The patent enables user equipment to perform self-service interference measurement by utilizing null resource elements embedded in downlink transmissions. Instead of requiring complex inter-base station coordination for interference measurement, the UE autonomously measures interference on configured null REs and reports results, significantly reducing processing complexity while maintaining effective bursty interference control.
Solution Approach 2:
The patent implements preliminary configuration of null resource element patterns and interference measurement resources before actual data transmission. This pre-configuration allows the system to establish measurement frameworks in advance, reducing real-time processing requirements during active transmission while maintaining effective interference control.
3Loss of information
If current interference measurement techniques are used, then long-term interference assessment is provided, but latency increases and ultra-low latency requirements are not met
Solution Approach 1:
The patent implements periodic interference measurement using null resource elements that are regularly embedded in downlink transmissions at configurable intervals. This periodic measurement approach provides up-to-date interference information without requiring continuous measurement, thereby reducing latency while maintaining accurate interference assessment for ultra-low latency applications.
Solution Approach 2:
The patent replaces the traditional mechanical approach of scheduled interference measurement (CSI-RS/IMR) with a signal-processing-based approach using null resource elements. By utilizing the inherent structure of downlink transmissions and embedded null REs, the system achieves faster interference measurement without additional measurement overhead, reducing latency while maintaining assessment accuracy.
Data Source
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AI summary
Aspects of the present disclosure provide various apparatuses and methods for utilizing null resource elements to facilitate dynamic and bursty inter-cell interference measurements in a wireless network like 5G new radio (NR). A user equipment (UE) is provided with resources and signaling to facilitate bursty interference measurements at demodulation time.