802.11aj Packet Formats
============================


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        **What are packet formats in 802.11aj?**

        802.11aj defines packet formats that include new fields for directional communication and extended channel widths at 45 GHz and 60 GHz.

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        **How do 802.11aj packet formats differ from 802.11ad?**

        802.11aj extends 802.11ad formats with additional header fields and supports dual-band operation for 45 GHz and 60 GHz.

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        **What frame types are used in 802.11aj?**

        It supports management, control, and data frames with enhancements for beamforming and multi-band coordination.

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        **Are there new fields in MAC headers for 802.11aj?**

        Yes, new fields include extended addressing, beamforming parameters, and multi-band indicators.

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        **How does 802.11aj handle beamforming information in packets?**

        Beamforming training and feedback are embedded in specific control frames with defined formats for phase and amplitude adjustments.

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        **Is the PHY header modified in 802.11aj?**

        The PHY header remains largely consistent with 802.11ad but supports extensions for dual-band operation and wider channels.

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        **Do 802.11aj packets support multi-link operation?**

        Yes, packet formats include fields that enable synchronization and coordination across multiple links.

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        **What are the size limits for 802.11aj packets?**

        Maximum MPDU size is similar to 802.11ad but can be adapted based on channel conditions and dual-band usage.

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        **How is error control handled in 802.11aj packets?**

        Packets include CRC fields and use forward error correction schemes compatible with high-frequency bands.

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        **Are there new management frames in 802.11aj?**

        Yes, management frames include enhanced signaling for band switching, beam training, and link maintenance.

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        **How do control frames in 802.11aj support MAC functions?**

        Control frames manage acknowledgments, block acknowledgments, and scheduling with additional timing and beamforming info.

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        **Is there support for packet aggregation in 802.11aj?**

        Yes, A-MPDU and A-MSDU aggregation are supported with packet formats accommodating larger aggregated frames.

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        **How are sequence numbers handled in 802.11aj packets?**

        Sequence numbers track frame order and support retransmission, similar to legacy 802.11 but adapted for multi-link scenarios.

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        **What role do QoS control fields play in 802.11aj packets?**

        QoS fields prioritize traffic and manage access in scheduled Service Periods and contention-based periods.

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        **Are there new addressing modes in 802.11aj packets?**

        Extended addressing modes support multi-link and multi-band operation with additional MAC address fields.

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        **How does 802.11aj handle packet fragmentation?**

        Fragmentation follows 802.11 standards but with timing and coordination adapted for directional and multi-band links.

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        **Are there special packet formats for power saving?**

        Yes, power management frames include fields for station sleep scheduling and wake-up signaling.

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        **Does 802.11aj support vendor-specific packet extensions?**

        Vendor-specific fields can be included in management frames for proprietary features while maintaining standard compliance.


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        Topics in this section,

                * :ref:`Reference links <packet_formats_aj_step17>`


.. _packet_formats_aj_step17:

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    .. tab-item:: Reference links
     
       * Reference links