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5g nr numerology

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5G NR, numerology refers to the set of parameters that define the structure of the radio frame and subframes. The numerology includes parameters such as subcarrier spacing, slot duration, and symbol duration. These parameters are crucial for configuring the physical layer of the 5G NR system.

Here are some key aspects of 5G NR numerology:

  1. Subcarrier Spacing:
    • Subcarrier spacing is the frequency difference between consecutive subcarriers within a resource block.
    • 5G NR supports multiple subcarrier spacings, and the choice of spacing depends on the deployment scenario and requirements.
    • Common subcarrier spacings include 15 kHz, 30 kHz, 60 kHz, and 120 kHz.
  2. Slot Duration:
    • A slot is a time unit in the time domain, and it is the basic time division unit in the 5G NR frame structure.
    • The slot duration is defined by the subcarrier spacing and can vary depending on the numerology.
    • Slots are further divided into symbols, and the number of symbols per slot depends on the specific numerology.
  3. Symbol Duration:
    • The symbol duration is the time taken to transmit one symbol in the time domain.
    • It is inversely proportional to the subcarrier spacing.
    • The symbol duration, along with the number of symbols per slot, determines the overall slot duration.
  4. Frame Structure:
    • The 5G NR frame structure is designed to be flexible and adaptable to different use cases and scenarios.
    • The frame structure is organized into multiple numerologies, allowing for the coexistence of diverse services with varying latency and bandwidth requirements.
  5. Multiple Numerologies:
    • 5G NR supports multiple numerologies to cater to different use cases and deployment scenarios.
    • Numerologies are defined by the combination of subcarrier spacing, slot duration, and the number of symbols per slot.
  6. Mini-Slot:
    • 5G NR introduces the concept of mini-slots, which are smaller time units within a slot.
    • Mini-slots enable more flexible scheduling and improved latency for short-duration transmissions.
  7. Scalability:
    • The flexibility in numerology allows 5G NR to scale to different deployment scenarios, including enhanced mobile broadband (eMBB), ultra-reliable low latency communication (URLLC), and massive machine type communication (mMTC).

5G NR numerology defines the time and frequency structure of the radio frame, providing flexibility to accommodate a wide range of use cases with varying requirements for data rate, latency, and reliability. The choice of numerology is crucial for optimizing the performance of 5G networks in different deployment scenarios.