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CC1312R: CC1312R

Yue Zhang65
Intellectual 500 points
Part Number: CC1312R

Hi,

I have a question on frequency interference for frequency hopping. I have two networks  next to each other (very close, just for a test). they have the same settings ( hopping on all channels, but different pan_id and etc.), one network ahs 10 nodes, the other has 25. I saw problems for the 2nd system when nodes join. the symptom is that random nodes from the 2nd system not always join. Not sure this is because of the interference of frequency. Is it possible I configure them with different channel mask will resolve the issue? my original thought was, it's frequency hopping, it's hard for nodes from different network to interference each other...if it is interference, why my first system is fine all the time. 

Thanks,

-Yue

  • 0
    TI__Mastermind 25810 points

    Hey Yue,

    I apologize you're experiencing this issue and hope to help resolve your concern.

    In frequency hopping mode, CSMA is used before transmitting to insure the traffic on the channel is clear before sending. For this reason, I'm unsure if this could be related to frequency interference. There could be channel noise due to the large network, have you tried testing this with two smaller networks?

    Some things to try:

    • Stagger the joining of each node so that they're all not attempting to join at the same time
    • Try setting up both networks with different channel masks
    • Reduce the trickle timers on the sensor to send async messages more often (increasing the chance the collector sees the join request)

    Hope this helps.

  • 0 in reply to Ammar N
    Intellectual 500 points

    Thank you Ammar,

    You are right, it's nothing to do with frequency interference. I will try what you suggested...

    -Yue