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 == ... ... @@ -36,18 +36,20 @@ 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 46 46 48 + 49 + 47 47 == 2.2 Adaptive Data Rate (ADR) and set max distance == 48 48 49 49 50 -**ADR** 53 +(% 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 51 52 52 53 53 By default, ADR is turn on((% style="color:#037691" %)**AT+ADR=1**) (%%)so End node ADR feature is enable. ... ... @@ -57,15 +57,14 @@ 57 57 58 58 (% style="color:#037691" %)**AT+ADR=0** 59 59 60 -(% style="color:#037691" %)**AT+DR=0** 63 +(% style="color:#037691" %)**AT+DR=0 **~/~/(%%) Use longest distance modulation 61 61 62 -(% style="color:#037691" %)**AT+TXP=0** 65 +(% style="color:#037691" %)**AT+TXP=0 **(%%)~/~/ Use max power For EU868, max power can be is AT+TXP=50 63 63 64 64 65 65 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. 66 66 67 67 68 - 69 69 == 2.3 Check for short distance problem == 70 70 71 71 ... ... @@ -78,17 +78,17 @@ 78 78 [[image:image-20221006185826-3.png]] 79 79 80 80 81 - 82 82 == 2.4 Best software settings for the longest distance == 83 83 84 84 85 85 Below are the settings for longest distance transmission. ( will reduce battery life) 86 86 87 -* (% style="color:#037691" %)**AT+ADR=0** 88 -* (% style="color:#037691" %)**AT+DR= 0** 89 -* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power .88 +* (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 89 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR,the longest distance modulation 90 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power For EU868, max power can be is AT+TXP=50 90 90 91 91 93 + 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 == ... ... @@ -102,13 +102,12 @@ 102 102 [[image:image-20221016081725-1.png||height="426" width="706"]] 103 103 104 104 105 - 106 106 = 4. Installation Guidelines = 107 107 108 108 == 4.1 Check the use environment == 109 109 110 110 111 -First , User should notice: Radio link quality and performances are highly dependent of the environment. 112 +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. 112 112 113 113 (% style="color:blue" %)**Better performances can be reached with:** 114 114 ... ... @@ -125,6 +125,7 @@ 125 125 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 126 126 127 127 129 + 128 128 == 4.2 Improve the Antenna == 129 129 130 130 ... ... @@ -131,7 +131,6 @@ 131 131 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. 132 132 133 133 134 - 135 135 = 5. Some real-world case = 136 136 137 137 == 5.1 Server reason cause end node has problem on Join. == ... ... @@ -171,6 +171,11 @@ 171 171 [[image:image-20221101000006-1.png||height="353" width="931"]] 172 172 173 173 175 += 6. Use a repeater = 174 174 175 175 178 +In some cases, user can consider use a repeater for limitation transmition. 176 176 180 +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]] 181 + 182 +