Null Resource Elements for Demodulation Interference Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in managing bursty interference due to their inflexible time slot structures, leading to overconservative scheduling decisions and inadequate performance in ultra-low latency applications, as existing interference measurement methods provide only long-term measurements.
Innovation Solution
The use of null resource elements for demodulation interference estimation, where a user equipment (UE) receives a null resource element pattern from a base station, allowing it to perform demodulation interference measurements and demodulate downlink communications more efficiently by reducing processing resources needed for channel estimation and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current interference measurement methods (CSI-RS or IMR) are used, then long-term interference measurements are provided, but scheduling decisions become overconservative and system throughput decreases
Solution Approach 1:
The patent applies preliminary action by having the UE perform interference measurements using null resource elements before the actual data transmission. The null REs are configured in advance to contain interference samples that represent the current bursty interference conditions, allowing the UE to prepare interference cancellation parameters beforehand. This enables more accurate and timely interference estimation without waiting for long-term measurements, thus avoiding overconservative scheduling decisions while maintaining measurement accuracy.
2Adaptability or versatility
If flexible time slot structures are used, then transmission adaptability is improved, but bursty inter-cell interference increases
Solution Approach 1:
The patent converts the harmful bursty interference into a beneficial resource for measurement purposes. By configuring null resource elements that are intentionally left without data transmission during flexible time slots, the system creates dedicated measurement opportunities where the UE can sample the bursty interference characteristics. The null REs act as interference sensors, allowing the system to characterize and compensate for the harmful bursty interference rather than simply reacting to it, thus enabling better scheduling decisions that maintain transmission flexibility while mitigating interference effects.
3Reliability
If fast scheduling coordination is used to control bursty interference, then interference management is improved, but time consumption and resource cost increase
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously perform interference measurements and generate its own interference cancellation parameters using the null resource elements. Instead of requiring continuous base station coordination and signaling for interference management, the UE independently samples interference from the null REs and processes these samples to create cancellation filters. This self-service approach significantly reduces the time and resources required for scheduling coordination while maintaining effective interference control, as the UE adapts to bursty interference conditions independently without waiting for centralized scheduling adjustments.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) that includes an indication of a null resource element pattern. The null resource element pattern may be indicated in the DCI using: a value of an antenna port field that also indicates one or more demodulation reference signal (DMRS) ports for the UE and a number of DMRS code-division multiplexing groups without data, or one or more zero power downlink reference signals. The UE may perform one or more demodulation interference measurements based at least in part on the null resource element pattern. The UE may demodulate a downlink communication based at least in part on performing the one or more demodulation interference measurements. Numerous other aspects are provided.