Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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edited by Edwin Chen
on 2023/08/29 09:16
on 2023/08/29 09:16
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... ... @@ -1,1 +1,1 @@ 1 -XWiki. Xiaoling1 +XWiki.Edwin - Content
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... ... @@ -37,14 +37,15 @@ 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:#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" %)((( 42 42 **Spreading Factor(Higher SF can transmit further)** 43 -)))|(% style="background-color:# 4f81bd; color:white; width:102px" %)**Band Width**43 +)))|(% style="background-color:#d9e2f3; 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 + 48 48 == 2.2 Adaptive Data Rate (ADR) and set max distance == 49 49 50 50 ... ... @@ -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 75 + 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 78 + 76 76 [[image:image-20221006185826-3.png]] 77 77 78 78 ... ... @@ -81,15 +81,13 @@ 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** (% style="color:#037691" %)**(downlinkpayload: 220000FF)**86 -* (% style="color:#037691" %)**AT+TXP=0** (% style="color:#037691" %)** (downlinkpayload: 22000000)**87 +* (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 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 87 87 88 88 89 - 90 90 == 2.5 Debug in Software == 91 91 92 - 93 93 Dragino can help client to debug the software for the distance issue. In the case , please send us below info: 94 94 95 95 * Detail packets include for Join Request, Join Accept, Uplink & Downlink, These packets should include: ... ... @@ -106,6 +106,7 @@ 106 106 107 107 b) check if the connector match. 108 108 110 + 109 109 [[image:image-20221016081725-1.png||height="426" width="706"]] 110 110 111 111 ... ... @@ -131,7 +131,6 @@ 131 131 * Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small. 132 132 133 133 134 - 135 135 == 4.2 Improve the Antenna == 136 136 137 137 ... ... @@ -148,6 +148,7 @@ 148 148 149 149 Below is the output log in gateway side ( SSH Access to Gateway and Check Station log) 150 150 152 + 151 151 [[image:image-20221006185826-4.png]] 152 152 153 153