Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -4,6 +4,8 @@ 4 4 5 5 6 6 7 + 8 + 7 7 = 1. OverView = 8 8 9 9 ... ... @@ -10,7 +10,6 @@ 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 - 14 14 = 2. Analyze at the software side = 15 15 16 16 == 2.1 LoRa parameters that effect distance == ... ... @@ -36,10 +36,10 @@ 36 36 37 37 **End node actually value when TXP=0 and DR=0** 38 38 39 -(% border="1.5" cellspacing="4" style="background-color:#fff fcc;color:black;width:1002px" %)40 -|(% style="width:134px" %)**Frequency band**|(% style="width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px" %)((( 40 +(% border="1.5" cellspacing="4" style="background-color:#f2f2f2; 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" %)((( 41 41 **Spreading Factor(Higher SF can transmit further)** 42 -)))|(% style="width:102px" %)**Band Width** 43 +)))|(% style="background-color:#d9e2f3; width:102px" %)**Band Width** 43 43 |(% style="width:134px" %)**EU868**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz 44 44 |(% 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 45 45 |(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz ... ... @@ -48,7 +48,7 @@ 48 48 == 2.2 Adaptive Data Rate (ADR) and set max distance == 49 49 50 50 51 -**ADR** 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. 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. ... ... @@ -58,15 +58,14 @@ 58 58 59 59 (% style="color:#037691" %)**AT+ADR=0** 60 60 61 -(% style="color:#037691" %)**AT+DR=0** 62 +(% style="color:#037691" %)**AT+DR=0 **~/~/(%%) Use longest distance modulation 62 62 63 -(% style="color:#037691" %)**AT+TXP=0** 64 +(% style="color:#037691" %)**AT+TXP=0 **(%%)~/~/Use max power For EU868, max power can be is AT+TXP=50 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 - 70 70 == 2.3 Check for short distance problem == 71 71 72 72 ... ... @@ -79,7 +79,6 @@ 79 79 [[image:image-20221006185826-3.png]] 80 80 81 81 82 - 83 83 == 2.4 Best software settings for the longest distance == 84 84 85 85 ... ... @@ -86,11 +86,10 @@ 86 86 Below are the settings for longest distance transmission. ( will reduce battery life) 87 87 88 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 .88 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR,the longest distance modulation 89 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power For EU868, max power can be is AT+TXP=50 91 91 92 92 93 - 94 94 = 3. Analyze at the hardware side = 95 95 96 96 == 3.1 Check if the antenna path is good ~-~- For LSn50v2 series end node == ... ... @@ -104,13 +104,12 @@ 104 104 [[image:image-20221016081725-1.png||height="426" width="706"]] 105 105 106 106 107 - 108 108 = 4. Installation Guidelines = 109 109 110 110 == 4.1 Check the use environment == 111 111 112 112 113 -First , User should notice: Radio link quality and performances are highly dependent of the environment. 110 +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. 114 114 115 115 (% style="color:blue" %)**Better performances can be reached with:** 116 116 ... ... @@ -127,7 +127,6 @@ 127 127 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 128 128 129 129 130 - 131 131 == 4.2 Improve the Antenna == 132 132 133 133 ... ... @@ -134,7 +134,6 @@ 134 134 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. 135 135 136 136 137 - 138 138 = 5. Some real-world case = 139 139 140 140 == 5.1 Server reason cause end node has problem on Join. == ... ... @@ -171,7 +171,14 @@ 171 171 [[image:image-20221031233759-3.png]] 172 172 173 173 169 +[[image:image-20221101000006-1.png||height="353" width="931"]] 174 174 175 175 172 += 6. Use a repeater = 176 176 174 + 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 + 177 177