DMRS Initialization Using Time and ID Index Segmentation

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Solution Overview

Problem

Current DMRS initialization methods in wireless communication systems, such as LTE, are insufficient for next-generation systems with larger index value ranges, leading to sequence collisions and reduced performance due to the use of modulo operations that can generate the same initial sequence value for different indices.

Innovation Solution

The method involves generating DMRS by combining time and ID indices, dividing the initial value into higher and lower bit fields, and using operations like multiplication, modulo, or XOR to ensure uniqueness and avoid sequence collisions, with the ability to adjust the number of ID bits based on the time index value range to prevent value overflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If modulo operations are used in DMRS initialization to handle index value ranges, then the system can process a wider range of index values, but sequence collisions occur when different indices generate the same initial sequence value

Engineering Contradiction:

Improveindex value rangeVSAvoidsequence collision risk

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The initial value is divided into two distinct portions: a first portion generated by combining the time index with at least a portion of the ID index, and a second portion generated from the ID index. This segmentation ensures that each portion contributes uniquely to the final DMRS sequence, preventing collisions that would occur with a single modulo operation on the entire index value.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a one-dimensional modulo operation to a two-dimensional structure by creating separate bit fields (first and second portions) with different generation rules. The first portion uses combination of time index and ID index, while the second portion uses only ID index, effectively adding a dimensional distinction that eliminates sequence collisions across different index ranges.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Loss of information

If the entire ID index is used in combination with time index, then more information is available for DMRS generation, but the complexity of the initialization process increases

Engineering Contradiction:

ImproveID index information utilizationVSAvoidinitialization process complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The ID index is segmented into two usage portions: one portion combined with the time index for the first bit field, and another portion (or the same portion) used independently for the second bit field. This segmentation allows full utilization of ID index information while maintaining a structured, manageable initialization process through clear separation of operations.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11588672B2Initialization and use of demodulation reference signal

Publication Date: 2023.02.21 ZTE CORP

AI summary

Methods, systems, and devices are disclosed for digital wireless communication, and more specifically, for initializing and using demodulation reference signals. In one exemplary aspect, a method of wireless communication performed by a communication node includes generating a first portion of an initial value of a demodulation reference signal (DMRS) based, at least in part, on combining a time index and at least a portion of an ID index. The method also includes generating a second portion of the initial value of the DMRS based, at least in part, on the ID index, and generating the initial value of the DMRS by combining at least the first and second portions. The method further includes transmitting or receiving the DMRS.