Dynamic DMRS Pattern Selection for Sidelink Slot Formats
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G New Radio (NR), face challenges in efficiently managing demodulation reference signals (DMRS) for sidelink communications, which are crucial for high-speed and dynamic vehicle-to-everything (V2X) scenarios, where traditional DMRS patterns may not adapt effectively to varying slot formats and OFDM symbol allocations.
Innovation Solution
The method involves determining and transmitting DMRS patterns based on specific slot formats, which can include multiple OFDM symbols, allowing for dynamic adaptation to different slot formats and relative speeds between communicating UEs, thereby optimizing DMRS allocation and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional fixed DMRS patterns are used for sidelink communications, then implementation is simple, but adaptability to varying slot formats and OFDM symbol allocations is poor
Solution Approach 1:
The patent implements dynamic DMRS pattern selection by determining DMRS patterns based on the actual slot format and number of OFDM symbols allocated for sidelink transmission. The system transitions from fixed patterns to dynamic patterns that adapt to varying slot formats (e.g., format 0, 1, 2, 3 with different symbol allocations), ensuring optimal DMRS placement regardless of the specific slot configuration used for V2X communications.
Solution Approach 2:
The patent changes the parameters governing DMRS pattern selection by using the slot format indicator and number of OFDM symbols as determining factors. Different slot formats (with varying numbers of OFDM symbols available for sidelink) trigger different DMRS patterns, allowing the system to adapt to parameter variations in slot configuration while maintaining systematic pattern determination.
2Productivity
If DMRS patterns are optimized for high-speed V2X scenarios with varying slot formats, then spectral efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent creates a universal DMRS pattern determination mechanism that works across multiple slot formats (0, 1, 2, 3) and different OFDM symbol allocations. The same determination logic applies regardless of which slot format is used, eliminating the need for separate signaling for each format and reducing overall signaling overhead while maintaining spectral efficiency across diverse V2X scenarios.
Solution Approach 2:
The system uses self-service by determining DMRS patterns based on already-available slot format information that is inherently part of the sidelink transmission configuration. Rather than requiring additional signaling to indicate DMRS patterns, the system autonomously determines appropriate patterns from the slot format context, reducing signaling overhead while maintaining adaptability.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a transmitter user equipment (UE) determines a first demodulation reference signal (DMRS) pattern for a first slot allocated for transmission over a sidelink between the transmitter UE and a receiver UE, wherein the first DMRS pattern is determined based at least on the first slot having a first slot format of two or more slot formats, and transmits, to the receiver UE, DMRS in the first slot according to the first DMRS pattern. In an aspect, the receiver UE determines the first DMRS pattern for the first slot based at least on the first slot having the first slot format, and receives, from the transmitter UE, DMRS in the first slot according to the first DMRS pattern.