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 == ... ... @@ -37,18 +37,19 @@ 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:# F2F2F2; width:1002px" %)41 -|(% style="width:134px ;background-color:#D9E2F3" %)**Frequency band**|(% style="width:400px;background-color:#D9E2F3" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px;background-color:#D9E2F3" %)(((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="width:102px ;background-color:#D9E2F3" %)**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 47 + 48 48 == 2.2 Adaptive Data Rate (ADR) and set max distance == 49 49 50 50 51 - (% 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.51 +**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. 52 52 53 53 54 54 By default, ADR is turn on((% style="color:#037691" %)**AT+ADR=1**) (%%)so End node ADR feature is enable. ... ... @@ -58,14 +58,15 @@ 58 58 59 59 (% style="color:#037691" %)**AT+ADR=0** 60 60 61 -(% style="color:#037691" %)**AT+DR=0 ~/~/(%%) Use longest distance modulation61 +(% style="color:#037691" %)**AT+DR=0** 62 62 63 -(% style="color:#037691" %)**AT+TXP=0 (%%)~/~/Use max power For EU868, max power can be is AT+TXP=5063 +(% style="color:#037691" %)**AT+TXP=0** 64 64 65 65 66 66 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. 67 67 68 68 69 + 69 69 == 2.3 Check for short distance problem == 70 70 71 71 ... ... @@ -78,6 +78,7 @@ 78 78 [[image:image-20221006185826-3.png]] 79 79 80 80 82 + 81 81 == 2.4 Best software settings for the longest distance == 82 82 83 83 ... ... @@ -84,9 +84,11 @@ 84 84 Below are the settings for longest distance transmission. ( will reduce battery life) 85 85 86 86 * (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 87 -* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR ,the longest distance modulation88 -* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power For EU868, max power can be is AT+TXP=5089 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR 90 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power. 89 89 92 + 93 + 90 90 = 3. Analyze at the hardware side = 91 91 92 92 == 3.1 Check if the antenna path is good ~-~- For LSn50v2 series end node == ... ... @@ -100,12 +100,13 @@ 100 100 [[image:image-20221016081725-1.png||height="426" width="706"]] 101 101 102 102 107 + 103 103 = 4. Installation Guidelines = 104 104 105 105 == 4.1 Check the use environment == 106 106 107 107 108 -First , User should notice: Radio link quality and performances are highly dependent of the environment. Even you have the same hardware and antenna, Different installation will result in different performance.113 +First , User should notice: Radio link quality and performances are highly dependent of the environment. 109 109 110 110 (% style="color:blue" %)**Better performances can be reached with:** 111 111 ... ... @@ -121,6 +121,8 @@ 121 121 * High ISM band usage by other technologies. 122 122 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 123 123 129 + 130 + 124 124 == 4.2 Improve the Antenna == 125 125 126 126 ... ... @@ -127,6 +127,7 @@ 127 127 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. 128 128 129 129 137 + 130 130 = 5. Some real-world case = 131 131 132 132 == 5.1 Server reason cause end node has problem on Join. == ... ... @@ -163,14 +163,7 @@ 163 163 [[image:image-20221031233759-3.png]] 164 164 165 165 166 -[[image:image-20221101000006-1.png||height="353" width="931"]] 167 167 168 168 169 -= 6. Use a repeater = 170 170 171 - 172 -In some cases, user can consider use a repeater for limitation transmition. 173 - 174 -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]] 175 - 176 176