Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -37,14 +37,16 @@ 37 37 38 38 **End node actually value when TXP=0 and DR=0** 39 39 40 -(% border="1" cellspacing=" 3" style="background-color:#f2f2f2; width:1002px" %)41 -|(% style=" background-color:#4f81bd; color:white; width:134px" %)**Frequency band**|(% style="background-color:#4f81bd; color:white; width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#4f81bd; color:white; width:362px" %)(((40 +(% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %) 41 +|(% 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:#4f81bd; color:white; width:102px" %)**Band Width**43 +)))|(% 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 + 48 48 == 2.2 Adaptive Data Rate (ADR) and set max distance == 49 49 50 50 ... ... @@ -58,9 +58,9 @@ 58 58 59 59 (% style="color:#037691" %)**AT+ADR=0** 60 60 61 -(% style="color:#037691" %)**AT+DR=0 ~/~/(%%) Use longest distance modulation63 +(% 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=5065 +(% 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. ... ... @@ -71,8 +71,10 @@ 71 71 72 72 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. 73 73 76 + 74 74 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) 75 75 79 + 76 76 [[image:image-20221006185826-3.png]] 77 77 78 78 ... ... @@ -81,25 +81,15 @@ 81 81 82 82 Below are the settings for longest distance transmission. ( will reduce battery life) 83 83 84 -* (% style="color:#037691" %)**AT+ADR=0** (% style="color:#037691" %)**(downlinkpayload: 2200FFFF)**85 -* (% style="color:#037691" %)**AT+DR=0** ,the longest distance modulation (% style="color:#037691" %)**(downlinkpayload: 220000FF)**86 -* (% style="color:#037691" %)**AT+TXP=0** For EU868, max power can be is AT+TXP=50 (% style="color:#037691" %)** (downlinkpayload: 22000000)**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 87 87 88 88 89 89 90 -== 2.5 Debug in Software == 91 - 92 - 93 -Dragino can help client to debug the software for the distance issue. In the case , please send us below info: 94 - 95 -* Detail packets include for Join Request, Join Accept, Uplink & Downlink, These packets should include: 96 -** RSSI, DataRate, FCNT, Frequency. 97 -** MIC command detail & Payload detail. 98 - 99 - 100 100 = 3. Analyze at the hardware side = 101 101 102 -== 3.1 Check if the antenna path is good ~-~- For LS N50v2 series end node ==96 +== 3.1 Check if the antenna path is good ~-~- For LSn50v2 series end node == 103 103 104 104 105 105 a) Open Enclosure and Check if the antenna connection to module is good. ... ... @@ -106,6 +106,7 @@ 106 106 107 107 b) check if the connector match. 108 108 103 + 109 109 [[image:image-20221016081725-1.png||height="426" width="706"]] 110 110 111 111 ... ... @@ -148,6 +148,7 @@ 148 148 149 149 Below is the output log in gateway side ( SSH Access to Gateway and Check Station log) 150 150 146 + 151 151 [[image:image-20221006185826-4.png]] 152 152 153 153