PTRS Pattern Configuration for Multi-TRP Wireless Communication
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Solution Overview
Problem
In multi-TRP/panel transmissions, designing Phase-Tracking Reference Signals (PTRS) associated with a same DeModulation Reference Signals (DMRS) port poses challenges due to differing requirements for PTRS patterns among different Transmitter Receiver Points (TRPs)/panels.
Innovation Solution
The method allows PTRSs associated with a same DMRS port to have different patterns in different time-frequency resources, enabling each TRP/panel to determine its own PTRS patterns based on specific requirements, reducing signaling overhead and improving channel estimation and transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different TRPs/panels use Frequency division multiplexing with the same DMRS port, then resource utilization is improved, but PTRS pattern design becomes complex due to different requirements from different TRPs/panels
Solution Approach 1:
The patent segments the PTRS configuration by introducing separate indication information for different TRPs/panels. Each TRP/panel has its own PTRS indication information that can be independently configured and signaled, allowing different patterns without requiring a completely separate PTRS port for each TRP/panel.
Solution Approach 2:
The patent makes the PTRS pattern configuration dynamic by allowing the indication information to be signaled through Downlink Control Information (DCI) or higher layer signaling. This enables flexible, adaptive configuration of PTRS patterns for different TRPs/panels based on actual transmission needs, rather than using a fixed uniform pattern.
2Loss of information
If a unified PTRS pattern is used for all TRPs/panels, then signaling overhead is reduced, but channel estimation reliability deteriorates due to inability to match different channel environments
Solution Approach 1:
The patent applies local quality by allowing each TRP/panel to have its own customized PTRS pattern configuration tailored to its specific channel environment. The indication information enables different PTRS patterns for different TRPs/panels, improving channel estimation reliability for each specific transmission path without requiring completely separate ports.
3Reliability
If separate PTRS ports are allocated for each TRP/panel, then channel estimation reliability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent makes a single DMRS port serve multiple functions by allowing it to be associated with multiple TRPs/panels through the indication information mechanism. This multi-functional approach enables different TRPs/panels to share the same DMRS port while maintaining separate PTRS pattern configurations, reducing the need for separate dedicated ports for each TRP/panel.
Data Source
AI summary
The present disclosure provides a method and device used in UE and a base station for wireless communications. The UE receives a first signaling; and operates a first radio signal. The first radio signal comprises K first-type sub-signals and K first-type reference signals; the first signaling is used for determining time-frequency resources occupied by the first radio signal; time-domain resources occupied by the K first-type sub-signals are non-orthogonal, and frequency-domain resources occupied by each two of the K first-type reference signals are mutually orthogonal; the K first-type reference signals are respectively used for channel estimation of the K first-type sub-signals, and a reference signal port of each of the K first-type reference signals is associated with a target reference signal port. The above method is advantageous in improving efficiency of PTRSs in multi-TRP/panel transmissions.