5G NR Numerology quick answers

5G NR
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1

Hi NR Experts.

Few queries…

  1. For f < 3 GHz: sub carrier spacing 15, 30, 60 kHz valid or 15 kHz valid only?

  2. Does FDD deployment valid for f < 3 GHz only?

  3. For FDD deployment only SCS 15 kHz used or 30 kHz valid as well?

  4. For f < 3 GHz any network having TDD deployment?

2

All 3 possible by spec.

Yes

I saw 15 kHz only.

I don’t think so SA. Maybe DSS?

3

2600 TDD NR I tested, but no deployment right now.

40 MHz 30 kHz same as > 3 GHz spec.

nsa or sa same.

4

Yes !

5

2.3 GHz TDD NR 100 MHz BW we have it live.

Some operators SA, majority are NSA, all major operators in Saudi have N40 & N41.

6

  • For FR1 frequencies below 3 GHz, 5G NR supports 15 kHz and 30 kHz SCS. While 60 kHz is defined in NR specifications, it is generally associated with higher-frequency deployments and is not commonly used for commercial sub-3 GHz macro deployments.

  • FDD is not restricted to <3 GHz only. NR FDD can be deployed in various FR1 bands depending on spectrum availability and operator strategy.

  • For FDD deployments, both 15 kHz and 30 kHz SCS are valid. In practice, many low-band deployments (600/700/800/900 MHz) use 15 kHz, while some mid-band FDD deployments may use 30 kHz.

  • Yes, there are several sub-3 GHz TDD deployments globally. For example, operators have deployed NR TDD in bands such as n40 (2300 MHz) and n41 (2500 MHz).

For a quick summary of NR numerology options and their typical deployment scenarios, I found this explanation useful when reviewing the topic:
https://techlteworld.com/numerology-and-subcarrier-spacing-scs-in-5g-nr/