Interferer Identification via Null Resource Pattern Signatures
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently identifying and coordinating interference between base stations, particularly in low-latency applications like XR, due to high overhead and inaccuracies in identifying interfering base stations using existing channel-state feedback mechanisms.
Innovation Solution
Implementing a method where base stations allocate unique subsets of null resources within their downlink transmissions, which serve as signatures, allowing user equipment to estimate interference statistics and transmit indications to the first base station for interference coordination, enabling efficient identification and coordination of interfering base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing channel-state feedback mechanisms are used to identify interfering base stations, then interference coordination can be achieved, but the overhead is high and identification accuracy is insufficient
Solution Approach 1:
The patent extracts the interferer identification function from the traditional channel-state feedback mechanism. By having the interfering base station transmit null resources with specific patterns (time-frequency locations, durations, or sequences) that do not carry useful data but serve as identifiable signatures, the system separates the identification task from the data transmission task, reducing feedback overhead while improving identification accuracy.
Solution Approach 2:
The patent uses null resource patterns as visual signatures analogous to color changes. Each interfering base station employs a unique pattern (different time positions, frequency locations, durations, or sequences of null resources) that can be distinctly detected by victim UEs, enabling accurate identification without requiring complex feedback messages.
2Reliability
If traditional interference coordination methods are used, then interference can be managed, but latency increases due to high overhead processing
Solution Approach 1:
The interfering base station transmits null resources with identifiable patterns proactively before the victim UE needs to report interference. This preliminary transmission of signature patterns allows the victim UE to detect and identify the interferer early, enabling faster coordination decisions without waiting for complex feedback processing.
Solution Approach 2:
The interfering base station performs self-identification through its own transmission characteristics (null resource patterns). The victim UE simply needs to detect these patterns and report the identifier, eliminating the need for complex bidirectional negotiation or feedback protocols, thus reducing coordination latency.
3Measurement precision
If more detailed interference information is collected, then identification accuracy improves, but the complexity of the system increases
Solution Approach 1:
The patent extracts only the essential identification information from the interference signal - the pattern characteristics of null resources (time locations, frequency locations, durations, or sequences). By focusing detection on these specific pattern features rather than analyzing the entire signal spectrum, the system achieves accurate identification with minimal processing complexity at the victim UE.
Data Source
AI summary
A second base station may allocate a set of downlink resources for a downlink transmission. The set of downlink resources may include a subset of null resources, which may serve as a signature for the second base station. The second base station may transmit downlink data or reference signals on the set of downlink resources including the subset of null resources. A first UE may experience the downlink transmission from the second base station as interference. The first UE may identify the set of downlink resources. The first UE may identify the subset of null resources. The first UE may transmit, to a first base station, an indication of the subset of null resources. The first base station may identify the second base station based on the indication of the subset of null resources. The first base station may transmit, to the second base station, an interference coordination message.