PT-RS Density Signaling Compression for 5G Phase Noise
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Solution Overview
Problem
In 5G wireless communication systems using ultra-high frequency bands, significant signal attenuation occurs due to phase noise, leading to decreased signal restoration capabilities, and the sharing of phase tracking reference signal (PT-RS) density information between nodes results in resource overhead.
Innovation Solution
The method involves encoding and compressing threshold values for time and frequency density of PT-RS using schemes such as uniform sampling grids, non-uniform sampling grids, combinational indexing, and imposing limits on threshold values to reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PT-RS density information is shared between nodes to enable phase noise compensation, then phase tracking capability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies parameter changes by transforming the representation of PT-RS density information from explicit threshold values to compressed indices. The threshold values are mapped to a reduced set of possible values, and only the index of the mapped value is transmitted. This changes the parameter representation from full precision to compressed form, maintaining phase tracking capability while significantly reducing signaling overhead.
Solution Approach 2:
The patent extracts only the essential information needed for phase tracking by using a lookup table approach. Instead of transmitting all threshold value details, the system extracts and transmits only the index that points to the appropriate threshold values in a pre-defined table. This extraction of critical information reduces redundancy while preserving the necessary phase tracking functionality.
2Measurement precision
If threshold values for PT-RS density are transmitted explicitly, then accuracy of phase noise compensation is maintained, but payload size increases
Solution Approach 1:
The patent changes the parameter representation from explicit threshold values to compressed indices. A lookup table maps indices to threshold values, allowing the system to transmit only the index (reducing payload size) while maintaining the ability to retrieve accurate threshold values for phase noise compensation when needed.
Solution Approach 2:
The patent uses a lookup table that stores pre-computed mappings between indices and threshold values. This copying approach allows the system to reference accurate threshold values without transmitting them explicitly, maintaining measurement precision while reducing the quantity of data transmitted.
Data Source
AI summary
Provided is a method and apparatus for providing information related to density of a PT-RS in a wireless communication system. The operation method of a base station may include: configuring a phase tracking reference signal (PT-RS) corresponding to a terminal; and transmitting time and frequency density information of the PT-RS to the terminal, and the time and frequency density information of the PT-RS is configured based on threshold values of time and frequency density of the PT-RS which are compressed based on at least one of a uniform sampling grid scheme, a non-uniform sampling grid scheme, a combinational indexing scheme, or a scheme of imposing a limit on a threshold value. Other embodiments may be possible.