5G UE Phase Tracking Reference Signal Resource Density Determination
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Solution Overview
Problem
The conventional 3GPP PTRS standard in 5G NR communication systems leads to a significant reduction in throughput due to an inherent mismatch in channel state information (CSI) estimation between user equipment (UE) and network nodes, primarily because the UE is blind to the dynamic allocation of phase tracking reference signal (PTRS) resource elements.
Innovation Solution
The UE determines or assumes an expected PTRS structure and resource block allocation a priori, excluding PTRS resources from CSI computation, and reports accurate CSI to the network node, allowing for better link adaptation and increased system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional 3GPP PTRS standard is applied in 5G NR communication systems, then phase noise mitigation is achieved, but throughput is significantly reduced due to CSI estimation mismatch between UE and network nodes
Solution Approach 1:
The UE determines or assumes an expected PTRS structure and resource block allocation a priori, before actual PTRS transmission. This preliminary determination allows the UE to exclude PTRS resources from CSI computation in advance, ensuring that CSI estimation is performed on the correct set of resource elements, thereby aligning UE and network node expectations and preventing throughput reduction
Solution Approach 2:
The UE reports accurate CSI to the network node based on its determined or assumed PTRS structure. This feedback mechanism ensures that the network node receives correct CSI information that reflects the actual PTRS resource allocation, enabling proper link adaptation and maintaining system throughput while still benefiting from phase noise mitigation
2Ease of operation
If the UE blindly estimates CSI without knowing PTRS resource allocation, then CSI computation is simplified, but CSI accuracy deteriorates due to mismatch with network node expectations
Solution Approach 1:
The UE performs preliminary determination or assumption of the PTRS structure and resource block allocation before CSI computation. This preliminary action provides the UE with the necessary information to accurately identify which resource elements contain PTRS and should be excluded from CSI computation, thereby maintaining both computational feasibility and CSI accuracy
Solution Approach 2:
The UE autonomously determines or assumes its own expected PTRS structure and resource block allocation without requiring explicit signaling from the network node. This self-service approach allows the UE to independently achieve accurate CSI estimation by correctly identifying PTRS resources to exclude, while keeping the system operation simple and efficient
Data Source
AI summary
The disclosed subject matter relates to techniques for determining channel state information (CSI) in New Radio (NR) access communication systems with phase tracking. In one embodiment, a method is provided that comprises receiving, by a device comprising a processer, configuration information from a network device of a wireless communication network indicating that a PTRS protocol has been configured for wireless communications between the device and the network device. The method further comprises, determining, by the device, a resource density of resource elements of the wireless communication network allocated for the phase tracking reference signal protocol, determining, by the device, CSI based on the resource density, and reporting, by the device, the CSI to the network device.