Simultaneous use of 2.4GHz and 5GHz on PAN9026

I am working on industrial grade system and need reliable wireless communication between several nodes. One option is to use PAN9026 as it incorporates dual mode WiFi (2.4Ghz/5Ghz).

Is it possible to send messages in parallel using 2.4Ghz and 5Ghz channels?

If not, can I send a message via 2.4GHz channel and then immediately switch to 5Ghz and send the same message? What will be the switching delay in this case?

 

Thanks,

Ros

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  • The PAN9026 is a dual band 2.4/5 GHz 802.11 a/b/g/n Wi-Fi/BT Combo radio module.

    It supports ...

    - dual simultaneous and independent WLAN and Bluetooth operation (BT Coexistence)

    - Dynamic Rapid Channel Switching (DRCS) for simultaneous operation in 2.4 GHz and 5 GHz bands

    - Dynamic frequency selection (radar detection - 802.11h DFS)

     

    As the PAN9026 has only one radio, there are some limitations and restrictions as all above features are timesharing mechanism. The limitations of driver API and SoC Firmware are listed in the Marvell SW package release notes available in the Marvell XtraNet.

     

    To the questions:

    Is it possible to send messages in parallel using 2.4Ghz and 5Ghz channels?

    Yes and no!

    Yes, you can send and receive data at a 2.4 GHz channel and a 5 GHz channel as well.

    No, you cannot send it in parallel, because of the DRCS mechanism is switching the channels / bands in time-domain. In case of enabling the DRCS mechanism, you cannot use simultaneous and independent WLAN and Bluetooth operation (BT Coexistence).

     

    If not, can I send a message via 2.4GHz channel and then immediately switch to 5Ghz and send the same message?

    The switching is done automatically if the DRCS mechanism is enabled. It cannot be addressed by message. You have to configure e.g. one micro-AP (uap0) on a 2.4 GHz channel and one micro-AP (uap1) on a 5 GHz channel by using the Marvell UAPUTL utility or the Linux tool "hostapd". Further a Station/Client (mlan0) can operate in parallel to the micro-AP's.

    In terms of Station/Client mode (mlan0), usually the Station assoziates on the channel used by the external AP. Of course in a Wireless Distribution  System (WDS) where several AP's using same SSID, but different channels/bands, the Station can do a fast hand-off by AP roaming (802.11r).

     

    What will be the switching delay in this case?

    Basically the maximum time slot for one DRCS switching cycle is one Beacon period (100TU) of AP. If using DRCS it is necessarry to configure the channel-time, switch-time, undoze-time, and the STA Rx traffic control scheme. These parameters are configured through a Marvell utility MLANUTL by "mc_cfg_ext" command.

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