DMRS Multiplexing for Uplink Repetition Adaptability

Solution Overview

Problem

Traditional demodulation reference signal (DMRS) designs for uplink repetitions in wireless communication systems face challenges when repetition lengths vary, leading to inefficiencies in power, processing, and signaling resource utilization, as they require extra signaling to accommodate different sizes, potentially resulting in too many or too few DMRSs, which degrades communication quality.

Innovation Solution

Multiplexing DMRSs with data or uplink control information in each symbol of physical uplink communications, allowing the DMRS pattern to be independent of repetition length, thereby conserving resources and enabling flexible assignment of symbols to repetitions without rearrangement due to slot boundaries or segmentations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional DMRS designs are used for uplink repetitions with varying lengths, then the system can accommodate different repetition sizes, but it requires extra signaling and results in too many or too few DMRSs which degrades communication quality

Engineering Contradiction:

Improveaccommodation of different repetition lengthsVSAvoidcommunication quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies universality by designing a single DMRS pattern structure that serves multiple repetition lengths. The DMRS is configured with a fixed pattern that can be universally applied regardless of whether the repetition is short or long, eliminating the need for different DMRS designs for different repetition sizes while maintaining communication quality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the parameter of DMRS configuration from being repetition-length-dependent to being fixed. By making the DMRS pattern independent of repetition length, the system avoids the signaling overhead and quality degradation associated with adapting DMRS parameters for each repetition size.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If traditional DMRS designs are used for uplink repetitions with varying lengths, then the system can support different repetition sizes, but it consumes extra power and processing resources due to determining DMRS design patterns for each repetition length

Engineering Contradiction:

Improvesupport for different repetition sizesVSAvoidpower and processing resource consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies universality by designing a single DMRS pattern structure that serves multiple repetition lengths. The DMRS is configured with a fixed pattern that can be universally applied regardless of whether the repetition is short or long, eliminating the need for different DMRS designs for different repetition sizes while maintaining communication quality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The fixed DMRS pattern structure serves itself across all repetition scenarios without requiring additional processing to determine appropriate patterns. The system automatically applies the same DMRS configuration regardless of repetition length, eliminating the need for complex determination logic and reducing processing resource consumption.

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If DMRS design patterns are determined for each repetition length, then the system can optimize DMRS placement, but it requires extra signaling and complicates the system operation

Engineering Contradiction:

ImproveDMRS placement optimizationVSAvoidsystem operation simplicity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies universality by designing a single DMRS pattern structure that serves multiple repetition lengths. The DMRS is configured with a fixed pattern that can be universally applied regardless of whether the repetition is short or long, eliminating the need for different DMRS designs for different repetition sizes while maintaining communication quality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies homogeneity by using a uniform DMRS pattern across all repetitions regardless of length. This homogeneous approach simplifies system operation by eliminating the need to handle different DMRS configurations for different repetition sizes, making the system easier to operate while still providing optimized DMRS placement through the fixed pattern design.

Inventive Principle:

Principle #33Homogeneity

Data Source

PatentUS11864182B2Demodulation reference signal multiplexing for uplink communications

Publication Date: 2024.01.02 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may multiplex one or more demodulation reference signals (DMRSs) with data or uplink control information in each symbol of one or more physical uplink communications. The UE may transmit the symbols of the one or more physical uplink communications. The physical uplink communications may include physical uplink repetitions. Numerous other aspects are provided.