CSI-RS Pattern Selection for Interference Avoidance
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing channel state information reference signals (CSI-RS) across multiple antenna ports, particularly in allocating resources for CSI-RS patterns that avoid interference with UE-RS signals, which can limit the availability of resources for CSI-RS in certain transmission configurations.
Innovation Solution
A method and apparatus for identifying and selecting a subset of CSI-RS patterns based on transmission configurations, allowing for flexible allocation of resources to avoid interference with UE-RS signals on specific antenna ports, thereby optimizing CSI-RS transmission in wireless communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed base pattern for CSI-RS is used for each number of CSI antenna ports, then device complexity is reduced, but resource utilization and adaptability deteriorate due to interference with UE-RS signals
Solution Approach 1:
The patent implements dynamic CSI-RS pattern selection where the base station chooses from multiple predefined patterns based on current transmission configuration. The pattern selection is dynamically adjusted according to UE-RS signal presence and antenna port configuration, allowing the system to adapt to different scenarios while maintaining manageable complexity through a finite set of predefined patterns.
Solution Approach 2:
The patent changes the parameter of CSI-RS resource allocation by selecting different patterns from a predefined set. Each pattern represents a different configuration of resource elements, and the selection is based on transmission configuration parameters such as the number of antenna ports and UE-RS signal presence, enabling flexible adaptation without redesigning the entire system.
2Reliability
If resource elements are allocated to avoid UE-RS signals on specific antenna ports, then interference is reduced, but the number of available resources for CSI-RS decreases
Solution Approach 1:
The patent segments the resource elements into different patterns, where each pattern is designed to avoid specific UE-RS signal locations for particular antenna port configurations. This segmentation allows the system to have multiple specialized patterns available, each optimized for specific scenarios, thereby maintaining reliable channel estimation while efficiently utilizing available resources in each configuration.
Solution Approach 2:
The patent creates a universal set of CSI-RS patterns that can be applied across different transmission configurations. Each pattern in the set is designed to be universally applicable to specific antenna port configurations, allowing the same pattern to serve multiple functions in different scenarios while avoiding UE-RS interference appropriately.
3Adaptability or versatility
If multiple CSI-RS patterns are made available for selection, then resource utilization and adaptability improve, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-defining a set of CSI-RS patterns before actual transmission. These patterns are prepared in advance and stored in the base station, eliminating the need for complex real-time pattern generation. During operation, the base station simply selects from the predefined set based on current configuration, significantly reducing runtime complexity while maintaining high adaptability.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for allocating resources for use in transmitting reference signals (RSs). According to certain aspects, a large set of enumerated possible CSI-RS resources ("CSI-RS patterns") may be defined and a base station may select a CSI-RS pattern from a subset of the available patterns, with the subset determined by a transmission configuration.