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will beacon message follow CSMA/CA scheme?

Rui Zhang69778
Genius 4525 points


If beacon request is received, will the beacon message follow the CSMA/CA algorithm to send out? is there any chance beacon can not been sent out due to the CSMA/CA?

Thanks

Rui

  • 0
    TI__Genius 10180 points

    Hi Rui!

    Is there a specific device you are concerned of in regards to this question?

    I searched online in an attempt to answer your questions, and found out the answer may depend on how the device is set up.  For example, in IEEE 802.15.4 standard, beacon-enabled networks have their own superfram structure, so devices are synchronized with slotted CSMA-CA frame and can transmit data back to the coordinator then; it is also possible to transfer data using nonbeacon-enabled networks through un-slotted CSMA-CA frames (Figure 1). 

    Figure 1.  IEEE 802.15.4 Data Transfer Model (http://pages.cs.wisc.edu/~suman/courses/838/papers/zigbee.pdf)

     

    Feel free to reply back with any inputs!  It is always a learning experience.  :)

     

    - Shiou Mei

  • 0 in reply to Shiou Mei Huang
    Genius 4525 points

    Hi Shiou Mei

    Thanks for your reply. I believe this paragraph only describe the CSMA/CA behavior for "data frame", I am not sure whether beacon is treated as "data frame",or some special management frame-MLME. I think should be later case, but not sure.

    Thanks

    Rui

  • 0 in reply to Rui Zhang69778
    Expert 1030 points

    did you completed csma/ca ....if u completed please tell me how to do..mine also same topic

    i have one doubt suppose i want to implement csma/ca channel accessing mechanism apart this should i write code for all the layer(APP,NWK,MAC,PHY) or not ? which layers and frames can i write code.

    just tell me the answer please

    thanks in advance