Multi-layer PT-RS with OCC Shifts for Phase Tracking
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Solution Overview
Problem
High-frequency wireless communication systems, particularly those using millimeter waves, face challenges with beamforming and waveform design, especially regarding phase tracking and power amplification efficiency, due to the need for precise timing and physical properties.
Innovation Solution
The method involves transmitting and receiving data signaling on multiple layers with Phase Tracking Reference Signaling (PT-RS) using Orthogonal Cover Code (OCC) permutations, allowing for phase tracking and spatial diversity, and utilizing waveforms like OFDM and SC-FDM to manage power amplification efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Phase Tracking Reference Signaling (PT-RS) is transmitted on multiple layers without orthogonal cover codes, then the signaling structure is simpler, but phase tracking precision deteriorates due to interference between layers
Solution Approach 1:
Orthogonal cover codes (OCC) are introduced as intermediary elements that mediate between multiple PT-RS layers. These codes provide orthogonality between layers, allowing the receiver to separate and track phase information from each layer independently without interference, thereby maintaining phase tracking precision while supporting multi-layer transmission
Solution Approach 2:
Different orthogonal cover codes are assigned to different layers or different PT-RS groups, creating local differentiation. This allows each layer to have its own unique signature for phase tracking, enabling precise measurement while maintaining overall system structure through systematic code assignment patterns
2Productivity
If PT-RS groups of different layers are transmitted at the same locations, then resource utilization is more efficient, but signal quality deteriorates due to layer interference
Solution Approach 1:
Orthogonal cover codes serve as mediators that enable simultaneous transmission of PT-RS groups from different layers at the same time-frequency locations. The orthogonality property of these codes ensures that the receiver can distinguish and process signals from different layers separately, maintaining signal quality while achieving efficient resource utilization
Solution Approach 2:
PT-RS groups from multiple layers are merged and transmitted together at the same resource locations. By combining the transmission resources efficiently and using orthogonal codes to separate them at reception, the system achieves both high resource utilization and maintained signal quality through the mathematical orthogonality of the applied codes
3Adaptability or versatility
If beamforming with small beams is used at high frequencies, then spatial selectivity is improved, but timing precision requirements increase
Solution Approach 1:
PT-RS is transmitted beforehand in the same beams as data to enable preliminary phase tracking. This preliminary action allows the receiver to establish accurate timing and phase references before actual data transmission, meeting the stringent timing precision requirements imposed by narrow beamforming while maintaining the spatial selectivity benefits
Solution Approach 2:
Phase tracking information is continuously monitored and adjusted using PT-RS. This feedback mechanism compensates for phase variations and timing deviations that occur during transmission, maintaining the required timing precision for narrow beamforming operations while preserving the spatial selectivity achieved through beamforming
Data Source
AI summary
There is disclosed a method of operating transmitting radio node in a wireless communication network. The method includes 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; wherein further groups of PT-RS of different layers are shifted relative to each other based on OCC codes, wherein at each location of a group of PT-RS, on each of the layers, there is applied a different OCC code. The disclosure also pertains to related devices and methods.