List of PPDUs Supported in 802.11ai
========================================


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        **What is a PPDU in IEEE 802.11ai?**

        PPDU (Physical Layer Protocol Data Unit) is the unit of data transmitted over the wireless medium at the PHY layer.

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        **Does 802.11ai introduce a new PPDU format?**

        No, 802.11ai uses standard PPDU formats defined by underlying PHY layers like 802.11ac or 802.11ax.

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        **What types of data are carried within the 802.11ai PPDU?**

        The PPDU carries management, control, and data frames including 802.11ai-specific management enhancements.

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        **How does 802.11ai ensure PPDU compatibility with legacy devices?**

        It maintains PPDU structure consistency, allowing devices without 802.11ai support to interoperate without disruption.

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        **What PHY layers does 802.11ai PPDU operate over?**

        802.11ai PPDUs operate over PHY layers like 802.11ac, 802.11ax, and others as defined by the deployment.

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        **Does 802.11ai modify the preamble of PPDU frames?**

        No, the preamble remains consistent with base 802.11 standards to ensure synchronization and interoperability.

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        **What role does PPDU play in client roaming in 802.11ai?**

        PPDU carries BSS Transition Management frames to assist clients with seamless roaming.

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        **How does 802.11ai utilize PPDU for power saving mechanisms?**

        Network-assisted power save frames are transmitted within the PPDU to coordinate client wake/sleep cycles.

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        **Is there any PHY layer change required to support 802.11ai PPDUs?**

        No, all enhancements are implemented at MAC and higher layers; PHY layer remains unchanged.

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        **How does 802.11ai PPDU support enhanced network management?**

        By carrying management and control frames with added information elements for better client and AP coordination.

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        **Can PPDU frame length vary in 802.11ai?**

        Yes, frame length varies depending on the payload and management frame sizes.

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        **How does 802.11ai ensure low latency in PPDU transmissions?**

        Through efficient scheduling and management of transmission timings at MAC and PHY layers.

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        **What is the impact of PPDU structure on network scalability in 802.11ai?**

        Standard PPDU formats allow scalable deployment without complex PHY modifications.

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        **Are there security implications in 802.11ai PPDU frames?**

        Security is maintained as per standard 802.11 mechanisms, with added management frames secured accordingly.

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        **How does PPDU facilitate communication between APs and clients in 802.11ai?**

        It encapsulates all frame types necessary for network coordination, client management, and data exchange.

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        **Can PPDU carry multiple frame types simultaneously in 802.11ai?**

        Each PPDU typically carries one MAC frame but can carry different frame types across transmissions.

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        **How is PPDU timing coordinated in 802.11ai?**

        Through MAC layer timing protocols and PHY synchronization to ensure proper frame exchange.

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        **Where can I find technical details on 802.11ai PPDU formats?**

        Details are available in the IEEE 802.11ai standard and PHY specification documents.

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        Topics in this section,

                * :ref:`Reference links <ppdu_ai_step17>`

.. _ppdu_ai_step17:

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    .. tab-item:: Reference links

       * Reference links