Sequence Generation for Mixed Numerology 5G NR Resources
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Solution Overview
Problem
Current 5G New Radio (NR) systems face challenges in supporting mixed numerologies within a subframe or symbol, requiring improved methods for generating reference signals and scrambling codes to accommodate varying subcarrier spacings and symbol durations across different resource blocks.
Innovation Solution
A method and apparatus for user equipment (UE) and base stations to determine numerologies, such as subcarrier spacing or symbol duration, and generate sequences based on indices associated with assigned resources, allowing for communication using mixed numerologies by matching resource block or symbol indices with corresponding reference numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 5G NR systems support multiple numerologies within a subframe or symbol, then the system's adaptability and versatility are improved, but the device complexity and difficulty of sequence generation increase
Solution Approach 1:
The patent applies local quality by generating different sequence types (first sequence for DM-RS, second sequence for data scrambling) for different local regions within the same subframe or symbol. Each sequence is generated using appropriate indices (first indices for DM-RS resources, second indices for data resources) that match the local numerology characteristics, allowing the system to handle mixed numerologies with tailored sequence generation strategies for each resource type.
Solution Approach 2:
The patent segments the sequence generation process into distinct parts: generating first sequences for demodulation reference signals using first indices, and generating second sequences for data scrambling using second indices. This segmentation allows independent optimization of each sequence type according to its specific requirements, reducing overall complexity while supporting mixed numerologies.
2Adaptability or versatility
If different subcarrier spacings and symbol durations are supported across resource blocks, then the system's versatility is improved, but the measurement precision and indexing accuracy become more difficult
Solution Approach 1:
The patent introduces an intermediary indexing mechanism where first indices are used to identify DM-RS resources and second indices are used to identify data resources. These indices act as mediators that map resources to sequences regardless of the underlying numerology variations. The sequence generation process uses these indices as intermediaries to handle the conversion between different subcarrier spacings and symbol durations, maintaining indexing accuracy across mixed numerologies.
3Productivity
If reference signals and data are transmitted on resources with mixed numerologies, then the system's productivity is improved, but the reliability of communication may deteriorate due to increased complexity
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting sequence generation parameters based on the numerology of the associated resources. First sequences are generated with parameters matching DM-RS resource characteristics, while second sequences use parameters matching data resource characteristics. This parameter adaptation ensures that each sequence is optimally suited to its associated resources, maintaining communication reliability despite mixed numerology environments.
Data Source
AI summary
Networks that support 5G communication may support different numerologies across and even within a symbol, slot, or subframe. Sequences, such as reference signals or data scrambled with a scrambling code, may be transmitted on resources with such mixed numerologies. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment. The UE may be configured to receive an indication of assigned resources for communicating with a base station. The UE may also be configured to determine a numerology associated with the assigned resources, and to determine one or more indices based on the numerology. The UE may also generate a sequence based on the one or more indices and communicate with the base station based on the sequence.