Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -37,15 +37,14 @@ 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="background-color:#d 9e2f3; width:134px" %)**Frequency band**|(% style="background-color:#d9e2f3; width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#d9e2f3; width:362px" %)(((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" %)((( 42 42 **Spreading Factor(Higher SF can transmit further)** 43 -)))|(% style="background-color:#d 9e2f3; width:102px" %)**Band Width**43 +)))|(% style="background-color:#4f81bd; color:white; 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 ... ... @@ -59,9 +59,9 @@ 59 59 60 60 (% style="color:#037691" %)**AT+ADR=0** 61 61 62 -(% style="color:#037691" %)**AT+DR=0 **~/~/(%%) Use longest distance modulation 61 +(% style="color:#037691" %)**AT+DR=0 **~/~/(%%) Use longest distance modulation 63 63 64 -(% style="color:#037691" %)**AT+TXP=0 **(%%)~/~/Use max power For EU868, max power can be is AT+TXP=50 63 +(% style="color:#037691" %)**AT+TXP=0 **(%%)~/~/ Use max power For EU868, max power can be is AT+TXP=50 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. ... ... @@ -72,10 +72,8 @@ 72 72 73 73 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. 74 74 75 - 76 76 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) 77 77 78 - 79 79 [[image:image-20221006185826-3.png]] 80 80 81 81 ... ... @@ -84,14 +84,25 @@ 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** (%%)~/~/ Disable ADR 88 -* (% style="color:#037691" %)**AT+DR= 89 -* (% style="color:#037691" %)**AT+TXP=0** (%%) 84 +* (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR (% style="color:#037691" %)**(downlinkpayload: 2200FFFF)** 85 +* (% style="color:#037691" %)**AT+DR=0** (%%)~/~/ Use the smallest DR,the longest distance modulation (% style="color:#037691" %)**(downlinkpayload: 220000FF)** 86 +* (% style="color:#037691" %)**AT+TXP=0** (%%)~/~/ Use max power For EU868, max power can be is AT+TXP=50 (% style="color:#037691" %)** (downlinkpayload: 22000000)** 90 90 91 91 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 + 92 92 = 3. Analyze at the hardware side = 93 93 94 -== 3.1 Check if the antenna path is good ~-~- For LS n50v2 series end node ==102 +== 3.1 Check if the antenna path is good ~-~- For LSN50v2 series end node == 95 95 96 96 97 97 a) Open Enclosure and Check if the antenna connection to module is good. ... ... @@ -98,7 +98,6 @@ 98 98 99 99 b) check if the connector match. 100 100 101 - 102 102 [[image:image-20221016081725-1.png||height="426" width="706"]] 103 103 104 104 ... ... @@ -124,6 +124,7 @@ 124 124 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 125 125 126 126 134 + 127 127 == 4.2 Improve the Antenna == 128 128 129 129 ... ... @@ -140,7 +140,6 @@ 140 140 141 141 Below is the output log in gateway side ( SSH Access to Gateway and Check Station log) 142 142 143 - 144 144 [[image:image-20221006185826-4.png]] 145 145 146 146