List of PPDUs Supported in 802.11ay

What is a PPDU in IEEE 802.11ay?

A PPDU is the physical layer frame used to encapsulate MAC layer data for wireless transmission in 802.11ay.

How does the PPDU structure differ from 802.11ad?

802.11ay adds support for higher MIMO streams, longer payloads, and extended headers for enhanced control and beamforming.

What are the main components of an 802.11ay PPDU?

It includes a preamble, header fields, training fields, and the payload data, all tailored for 60 GHz operation.

What is the role of the preamble in the PPDU?

The preamble allows the receiver to synchronize with the incoming signal and estimate the channel before decoding the payload.

Does 802.11ay support extended preamble formats?

Yes, especially for MIMO and channel bonding scenarios where accurate channel estimation is critical.

How does the PPDU handle MIMO in 802.11ay?

The PPDU includes fields and training sequences that support up to 8 MIMO streams using beamforming and spatial multiplexing.

What are Training (TRN) fields used for in the PPDU?

TRN fields assist with beamforming by allowing transmitters and receivers to refine beam patterns during transmission.

Can PPDUs be aggregated in 802.11ay?

Yes, PPDU aggregation is supported for higher throughput and reduced overhead during burst transmissions.

Is there support for channel bonding in PPDUs?

Absolutely, 802.11ay allows bonding of up to 4 channels (totaling 8.64 GHz), and PPDUs are structured accordingly.

What are the modulation schemes used in the PPDU payload?

PPDUs use various modulations including BPSK, QPSK, 16-QAM, 64-QAM, and up to 256-QAM for high data rates.

How does 802.11ay ensure backward compatibility in PPDU?

It defines legacy-compatible preambles and headers to allow co-existence and interoperability with 802.11ad devices.

What role does the PHY header play in the PPDU?

The PHY header carries information like length, MCS, channel width, and other parameters necessary for correct decoding.

Can a single PPDU carry multiple MPDUs?

Yes, through MAC-layer aggregation, multiple MAC Protocol Data Units can be carried in one PPDU for efficiency.

How does PPDU design support high-throughput applications?

Large payload support, high-order modulation, and aggregation enable gigabit-level throughput over 60 GHz links.

Is beam refinement possible within a single PPDU?

Yes, training sequences embedded in the PPDU allow for in-frame beam tracking and refinement.

What is the maximum PPDU duration in 802.11ay?

It can support much longer durations than 802.11ad, with limits extended to support wider channels and longer bursts.

Are different PPDU types defined in 802.11ay?

Yes, there are different types such as Control, Data, and Training PPDUs, each structured for its specific role.

How does error correction work in the PPDU?

Forward Error Correction (FEC) is applied using LDPC or BCC schemes depending on the MCS and configuration.

Can PPDUs adapt dynamically to channel conditions?

Yes, modulation and coding can be dynamically adjusted between PPDUs based on link quality and feedback mechanisms.

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