Wi-Fi 7 PHY/MAC technology deep dive
Objective: We shall address Wi-Fi 7 PHY/MAC technology in detail.
Pre-requisites: We expect engineers to be prevalent in Wi-Fi 4/5/6/6E technologies.
Main objective of Wi-Fi 7
- Main objective of Wi-Fi 7
- Peak rate enhancements
- Better use of 6 GHz
- High-rate requirements to compete with 5G and beyond
- Timelines envisaged for completion of standards
- PHY/RF enhancements
- Large bandwidth channels
- Subcarrier usage; differences from 11ax
- 240 MHz and 320 MHz; link to 6 GHz spectrum
- What bandwidth combinations are allowed?
- OFDMA enhancements; small size and large-sized RU classification
- RU allocation flexibilities
- RU/MRU restrictions for 20 MHz
- EHT Preamble ; backward and forward compatibility
- Legacy preamble for backward compatibility
- U-SIG for forward compatibility
- L-STF, L-LTF, L-SIG, and RL-SIG and LTF
- Preamble puncturing ; what is the difference from 802.11ax
- Preamble puncturing possibilities and signaling
- PPDU format for SU and MU transmissions
- Types of PPDUs; MU, TB, SU, and ER
- Role of EHT-SIG; comparisons with 11ax
- Updates to modulation, coding, MIMO, MU-MIMO, beamforming
- New HOM; Challenges in EVM and sensitivity
- MIMO/MU-MIMO enhancements and their impact
- Sounding feedback parameters
- Sounding to mixed bandwidth STAs
- Other topics
- Spectral mask
- Spectral flatness requirements
- CCA sensitivity
- Local oscillator requirements
- PHY related agreements for SST
- Large bandwidth channels
- Multi-link operation
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- Motivation and general points
- Types of MLDs
- MLSR, MLMR, EMLSR
- STR/NSTR classifications
- Multi-link discovery
- Discovery procedures and RNR
- ML element structure
- Usage and rules of ML information element in the context of discovery
- Multi-link setup
- Procedure
- ML transition
- Security
- Usage and rules of ML Information element
- TID-to-link mapping and link management
- Default mode and enablement
- TID-to-link mapping
- Individual addressed data delivery and retransmission
- Multi-link block ack
- Procedures
- Sharing and extension of SN space
- Power save
- Multi-link group addressed frame delivery
- Multi-link channel access
- STR and Non-STR
- Capability signaling
- Multi-BSSID operation
- Quality of service for latency sensitive traffic
- Enhanced multi-link operation mode
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