Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -1,1 +1,1 @@ 1 -XWiki. Xiaoling1 +XWiki.Edwin - Content
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... ... @@ -4,8 +4,6 @@ 4 4 5 5 6 6 7 - 8 - 9 9 = 1. OverView = 10 10 11 11 ... ... @@ -12,6 +12,7 @@ 12 12 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. 13 13 14 14 13 + 15 15 = 2. Analyze at the software side = 16 16 17 17 == 2.1 LoRa parameters that effect distance == ... ... @@ -37,19 +37,18 @@ 37 37 38 38 **End node actually value when TXP=0 and DR=0** 39 39 40 -(% border="1.5" cellspacing="4" style="background-color:#f 2f2f2; width:1002px" %)41 -|(% style=" background-color:#d9e2f3;width:134px" %)**Frequency band**|(% style="background-color:#d9e2f3;width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#d9e2f3;width:362px" %)(((39 +(% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %) 40 +|(% style="width:134px" %)**Frequency band**|(% style="width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px" %)((( 42 42 **Spreading Factor(Higher SF can transmit further)** 43 -)))|(% style=" background-color:#d9e2f3;width:102px" %)**Band Width**42 +)))|(% style="width:102px" %)**Band Width** 44 44 |(% style="width:134px" %)**EU868**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz 45 45 |(% style="width:134px" %)**US915**|(% style="width:400px" %)20 or 22 dBm (depends on max output of module)|(% style="width:362px" %)SF=10|(% style="width:102px" %)125Khz 46 46 |(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz 47 47 48 - 49 49 == 2.2 Adaptive Data Rate (ADR) and set max distance == 50 50 51 51 52 - (% style="color:#037691" %)**ADR**(%%)is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time.50 +**ADR** is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time. 53 53 54 54 55 55 By default, ADR is turn on((% style="color:#037691" %)**AT+ADR=1**) (%%)so End node ADR feature is enable. ... ... @@ -59,14 +59,15 @@ 59 59 60 60 (% style="color:#037691" %)**AT+ADR=0** 61 61 62 -(% style="color:#037691" %)**AT+DR=0 ~/~/(%%) Use longest distance modulation60 +(% style="color:#037691" %)**AT+DR=0** 63 63 64 -(% style="color:#037691" %)**AT+TXP=0 (%%)~/~/Use max power For EU868, max power can be is AT+TXP=5062 +(% style="color:#037691" %)**AT+TXP=0** 65 65 66 66 67 67 This can be downlink via the LoRaWAN downlink command, see [[this link>>url:http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H8.2UseDownlinkCommandtosetafixuplinkDR]] for reference. 68 68 69 69 68 + 70 70 == 2.3 Check for short distance problem == 71 71 72 72 ... ... @@ -79,6 +79,7 @@ 79 79 [[image:image-20221006185826-3.png]] 80 80 81 81 81 + 82 82 == 2.4 Best software settings for the longest distance == 83 83 84 84 ... ... @@ -85,10 +85,9 @@ 85 85 Below are the settings for longest distance transmission. ( will reduce battery life) 86 86 87 87 * (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 88 -* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR ,the longest distance modulation89 -* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power For EU868, max power can be is AT+TXP=5088 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR 89 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power. 90 90 91 - 92 92 = 3. Analyze at the hardware side = 93 93 94 94 == 3.1 Check if the antenna path is good ~-~- For LSn50v2 series end node == ... ... @@ -102,6 +102,7 @@ 102 102 [[image:image-20221016081725-1.png||height="426" width="706"]] 103 103 104 104 104 + 105 105 = 4. Installation Guidelines = 106 106 107 107 == 4.1 Check the use environment == ... ... @@ -123,7 +123,6 @@ 123 123 * High ISM band usage by other technologies. 124 124 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 125 125 126 - 127 127 == 4.2 Improve the Antenna == 128 128 129 129 ... ... @@ -130,6 +130,7 @@ 130 130 In some case, we have to install the device inside the chamber or next to a metal case. So the signal between the antenna and the receiver (gateway) is blocked by the metal. This will greatly reduce the signal. In such case, we can consider using antenna extend cable to extend the antenna to a better position. 131 131 132 132 132 + 133 133 = 5. Some real-world case = 134 134 135 135 == 5.1 Server reason cause end node has problem on Join. == ... ... @@ -169,11 +169,6 @@ 169 169 [[image:image-20221101000006-1.png||height="353" width="931"]] 170 170 171 171 172 -= 6. Use a repeater = 173 173 174 174 175 -In some cases, user can consider use a repeater for limitation transmition. 176 - 177 -See here for how to set up: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay >>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay]] 178 - 179 179