Changes for page How to improve LoRaWAN distance
Last modified by Mengting Qiu on 2023/11/16 17:21
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... ... @@ -10,20 +10,21 @@ 10 10 In real-world deployment for LoRa, distance is a common topic. We always want to have the longest distance. This chapter shows some instructions for how to improve this. 11 11 12 12 13 + 13 13 = 2. Analyze at the software side = 14 14 15 - 16 16 == 2.1 LoRa parameters that effect distance == 17 17 18 18 19 19 Some settings in End Node will affect the transfer distance. They are: 20 20 21 -* (% style="color:blue" %)**TXPower: **(%%)This means the output power from End Node. There is a command [[AT+TXP>>url:http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.14TransmitPower]] can be used to set the output power. TXP parameters follow the LoRaWAN regional document (rp2-1.0.3-lorawan-regional-parameters.pdf). Set to AT+TXP=0 21 +* (% style="color:blue" %)**TXPower: **(%%)This means the output power from End Node. There is a command [[AT+TXP>>url:http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.14TransmitPower]] can be used to set the output power. TXP parameters follow the LoRaWAN regional document (rp2-1.0.3-lorawan-regional-parameters.pdf). Set to (% style="color:#037691" %)**AT+TXP=0**(%%) is always has the maximum output, but (% style="color:#037691" %)**AT+TXP=0**(%%) has different value in different frequency bands. 22 22 23 23 * (% style="color:blue" %)**Data Rate(DR): **(%%)This is a combination of Spreading Factor and Band Width. Lowest Data Rate (DR=0) always has the longest transmit distance in LoRaWAN protocol. 24 24 25 25 Below is the TXPower and DR table of EU868 Frequency band as reference. 26 26 27 + 27 27 [[image:image-20221006185826-1.png]] 28 28 29 29 ... ... @@ -30,10 +30,10 @@ 30 30 [[image:image-20221006185826-2.png]] 31 31 32 32 33 -Set AT+TXP=0 34 +Set (% style="color:#037691" %)**AT+TXP=0**(%%) **and** (% style="color:#037691" %)**AT+DR=0**(%%) will always has the longest transmit distance. But note that different frequency band has different TXP and DR coding according to LoRaWAN regional settings. Below is example for EU868, US915 and AS923 compare for example. 34 34 35 35 36 -End node actually value when TXP=0 and DR=0 37 +**End node actually value when TXP=0 and DR=0** 37 37 38 38 (% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %) 39 39 |(% style="width:134px" %)**Frequency band**|(% style="width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px" %)((( ... ... @@ -73,7 +73,7 @@ 73 73 According to the above technology, if we have a problem on the distance, we can first check if the end node is trying to longest distance modulation already. We can see that from the LoRaWAN server. Below is an example from Chirpstack. 74 74 75 75 76 -We can see the traffic in gateway ’s page and know that the distance is SF12 / BW125. (note, server is not able to know Transmit Power settings from End Node)77 +We can see the traffic in gateway's page and know that the distance is SF12 / BW125. (note, server is not able to know Transmit Power settings from End Node) 77 77 78 78 79 79 [[image:image-20221006185826-3.png]] ... ... @@ -85,15 +85,14 @@ 85 85 86 86 Below are the settings for longest distance transmission. ( will reduce battery life) 87 87 88 -* (% style="color:#037691" %)AT+ADR=0 (%%)~/~/ Disable ADR 89 -* (% style="color:#037691" %)AT+DR= 0 (%%)~/~/ Use the smallest DR 90 -* (% style="color:#037691" %)AT+TXP=0 (%%) ~/~/ Use max power. 89 +* (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 90 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR 91 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power. 91 91 92 92 93 93 94 94 = 3. Installation Guidelines = 95 95 96 - 97 97 == 3.1 Check the use environment == 98 98 99 99 ... ... @@ -126,7 +126,6 @@ 126 126 127 127 = 4. Some real-world case = 128 128 129 - 130 130 == 4.1 Server reason cause end node has problem on Join. == 131 131 132 132