Phase Tracking Reference Signal Port Determination via TCI State
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving downlink phase tracking reference signals (PT-RS) between terminals and base stations, particularly in determining the number of PT-RS ports and reporting channel state information, which affects phase noise estimation and beamforming accuracy.
Innovation Solution
The method involves determining the number of downlink PT-RS ports based on transmission configuration indications in the DCI, allowing the user equipment (UE) to receive PT-RS from one or multiple DMRS port groups, and reporting strongest layer indicators to the base station for efficient resource allocation and phase noise estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of PT-RS ports is determined based on TCI state information in DCI, then phase noise estimation accuracy is improved, but device complexity increases due to additional determination logic
Solution Approach 1:
The patent uses TCI state information as an intermediary element to determine the number of PT-RS ports. Instead of directly configuring PT-RS ports through complex control mechanisms, the system leverages existing TCI state indications in DCI as a mediator to infer the appropriate number of ports, thereby simplifying the overall determination logic while maintaining estimation accuracy
Solution Approach 2:
The determination mechanism leverages the UE's existing capability to interpret TCI state information already present in DCI for other purposes. By utilizing this pre-existing information processing capability, the system avoids adding separate complex determination logic, allowing the UE to self-determine PT-RS port configuration based on existing data interpretation skills
2Productivity
If PT-RS transmission resources are explicitly indicated in DCI, then resource allocation efficiency is improved, but latency increases due to additional signaling overhead
Solution Approach 1:
The patent extracts the essential information needed for PT-RS port determination from the existing TCI state information in DCI, rather than adding separate explicit indication fields. By taking out and utilizing the relevant port configuration information that already exists in TCI states, the system achieves efficient resource allocation without the latency penalty of additional signaling overhead
Solution Approach 2:
The TCI state information serves multiple functions: it provides beam indication for downlink transmission and simultaneously determines the number of PT-RS ports. This multi-functionality eliminates the need for separate dedicated signaling for PT-RS port configuration, thereby improving resource allocation efficiency while avoiding additional latency from extra signaling messages
3Measurement precision
If multiple DMRS port groups are configured for PT-RS reception, then beamforming accuracy is improved, but device complexity increases due to multiple port group management
Solution Approach 1:
The patent segments the DMRS ports into multiple port groups, where each port group corresponds to a specific beam or spatial direction. This segmentation allows the system to manage multiple beams in an organized manner, with each port group handling specific spatial information, thereby improving beamforming accuracy while maintaining manageable complexity through structured organization
Solution Approach 2:
Each DMRS port group is assigned specific local characteristics related to particular beams or spatial directions. By赋予 each port group distinct local quality attributes (such as associated beam directions and spatial properties), the system achieves accurate beamforming for each specific direction while avoiding the need to manage all ports uniformly, thus reducing overall management complexity
Data Source
AI summary
The present invention provides a method for receiving, by a terminal, a downlink phase tracking reference signal from a base station in a wireless communication system, and a device for supporting the same. According to an embodiment applicable to the present invention, a terminal may receive, from a base station, a phase tracking reference signal on the basis of the number of phase tracking reference signal ports, which is determined on the basis of different methods, according to whether transmission configuration indication (TCI) state-related information exists in received downlink control information. Further, the base station may transmit the phase tracking reference signal to the terminal accordingly.