Mixed Numerology and Adaptive Subcarrier Bandwidth — Lesson 2

This lesson covers the frame structure for the fifth-generation mobile communication system. It discusses how the slot size remains constant in terms of the number of OFDM symbols, but the time duration for the slot changes due to the flexibility of the OFDM symbol. The lesson also explains how this flexibility allows for different amounts of resources to be available for various services. It further delves into the concept of Ultra Reliable Low Latency (URLCC) and its critical role in a typical communication system. The lesson also touches on the impact of phase noise and Doppler conditions on the inter carrier interference and the concept of mixed numerology. It concludes with Adaptive sub-carrier bandwidth proposal and its benefits.

Video Highlights

00:18 - Unified NR frame structure
04:28 - Provision for mini slot in the new generation system and its benefits
07:23 - Mixed numerology and how it can be implemented
08:51 - Impact of doppler and phase noise on the inter carrier interference
14:50 - Analysis of ICI from doppler frequency spread
19:48 - Results - Doppler velocity in kmph
22:54 - Adaptive sub-carrier bandwidth proposal and its benefits
28:28 - Conclusion

Key Takeaways

- The slot size in 5G remains constant in terms of the number of OFDM symbols, but the time duration changes due to the flexibility of the OFDM symbol.
- The flexibility in the frame structure allows for different amounts of resources to be available for various services.
- Ultra Reliable Low Latency (URLCC) is a critical aspect of a typical communication system.
- Phase noise and Doppler conditions can significantly impact the inter carrier interference.
- The concept of mixed numerology allows for the simultaneous support of different numerologies.