Multi-layer PT-RS Shifting for Phase Tracking Reliability
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Solution Overview
Problem
High-frequency wireless communication systems face challenges in phase tracking and spatial diversity due to the ubiquitous use of beamforming and new waveforms, particularly at millimeter wave frequencies above 52.6 GHz, which affect data signaling and reference signaling efficiency.
Innovation Solution
The method involves transmitting and receiving data signaling on multiple layers with Phase Tracking Reference Signaling (PT-RS) samples inserted into data sequences, where PT-RS samples from different layers are shifted relative to each other, and utilizing orthogonal cover codes to configure PT-RS sequences, allowing for phase tracking and efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PT-RS samples are inserted into data sequences on multiple layers for phase tracking, then phase tracking reliability is improved, but signal interference between layers increases
Solution Approach 1:
The patent divides PT-RS samples into separate groups for different layers, with each layer having its own dedicated PT-RS sample positions. This segmentation prevents inter-layer interference while maintaining phase tracking capability on each layer independently.
Solution Approach 2:
The patent introduces layer indexing as an additional dimension to distinguish PT-RS samples from different layers. By incorporating the layer index into the PT-RS sample positioning and identification, the system can maintain separate phase tracking references for each layer without mutual interference.
2Object-generated harmful factors
If PT-RS samples from different layers are shifted relative to each other, then inter-layer interference is reduced, but processing complexity increases
Solution Approach 1:
The patent employs periodic shifting patterns for PT-RS samples across layers, where the shift amount follows a regular sequence based on layer index. This periodic approach reduces interference while maintaining predictable, manageable processing complexity through systematic rather than arbitrary shifting.
Solution Approach 2:
The patent systematically varies the PT-RS sample position parameter across different layers according to a defined rule (e.g., position = base_position + layer_index × shift_amount). This parameter-based approach enables controlled interference reduction while keeping processing complexity manageable through formulaic rather than ad-hoc adjustments.
3Measurement precision
If orthogonal cover codes are used to configure PT-RS sequences, then phase tracking precision is improved, but overhead increases
Solution Approach 1:
The patent uses a single set of orthogonal cover codes to serve multiple layers simultaneously, where the same codebook is reused across layers with different indexing. This universal approach provides precise phase tracking for all layers while avoiding the overhead of maintaining separate codebooks for each layer.
Solution Approach 2:
The patent copies the same orthogonal cover code structure across multiple layers, reusing the base code sequence with layer-specific indexing or phase shifts. This copying approach maintains phase tracking precision on each layer while minimizing overhead by avoiding redundant code definitions.
Data Source
AI summary
There is disclosed a method of operating transmitting radio node in a wireless communication network. The method comprises transmitting data signaling on multiple layers, wherein on each layer, there is transmitted a sequence of samples representing data, samples representing PT-RS being inserted into the sequence of samples in one or more groups, each group representing a PT-RS sample sequence. Groups of PT-RS of different layers are shifted relative to each other. The disclosure also pertains to related devices and methods.