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Hot!Initial Spreading Factor (SF)

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@JDP
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2017/02/13 16:03:38 (permalink)
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Initial Spreading Factor (SF)

 
Original RN2xx3 firmware defaulted to SF=7, which is the fastest spreading factor but gives the shortest range:
 
RN2903v095, "mac get dr" returns DR=3 aka SF=7
RN2483v101: "mac get dr" returns DR=5 aka SF=7
 
Based on feedback from some networks, the default was changed to SF=12 (for RN2483) which gives the longest range, and so best for finding a distant network, but is also very slow. This has caused a lot of debate, as it is bad for spectrum usage and can congest the network if lots of nodes are repeatedly trying to join.
 
Also, LoRa Alliance best practices say that nodes must never be allowed to remain static on SF=12 or SF=11, because of the potential for congestion. Instead, they should endeavour to use the fastest SF at all times.
 
Based on this, it is recommended to start with SF=7 ("mac set dr 5", for RN2483) before an OTAA join, then if the UART response is "denied" (i.e. no response from the server) then increase the SF step-by-step to get to SF=12. Overall this is better for the network.
 
If that is not possible, default to SF=10 ("mac set dr 2", for RN2483)
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    guanucoluis
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    Re: Initial Spreading Factor (SF) 2019/09/16 13:06:32 (permalink)
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    Hello @JDP, did you can change the Spreading Factor (RN2903/RN2483)? I know this post was as long time but I haven't found how to change the SF using serial communication.
     
    Regards,
    Luis.
     
    @JDP
     
    Original RN2xx3 firmware defaulted to SF=7, which is the fastest spreading factor but gives the shortest range:
     
    RN2903v095, "mac get dr" returns DR=3 aka SF=7
    RN2483v101: "mac get dr" returns DR=5 aka SF=7
     
    Based on feedback from some networks, the default was changed to SF=12 (for RN2483) which gives the longest range, and so best for finding a distant network, but is also very slow. This has caused a lot of debate, as it is bad for spectrum usage and can congest the network if lots of nodes are repeatedly trying to join.
     
    Also, LoRa Alliance best practices say that nodes must never be allowed to remain static on SF=12 or SF=11, because of the potential for congestion. Instead, they should endeavour to use the fastest SF at all times.
     
    Based on this, it is recommended to start with SF=7 ("mac set dr 5", for RN2483) before an OTAA join, then if the UART response is "denied" (i.e. no response from the server) then increase the SF step-by-step to get to SF=12. Overall this is better for the network.
     
    If that is not possible, default to SF=10 ("mac set dr 2", for RN2483)




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