Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -45,6 +45,7 @@ 45 45 |(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz 46 46 47 47 48 + 48 48 == 2.2 Adaptive Data Rate (ADR) and set max distance == 49 49 50 50 ... ... @@ -91,25 +91,11 @@ 91 91 92 92 93 93 94 -= 3. Analyzeatthe hardwareside =95 += 3. Installation Guidelines = 95 95 96 -== 3.1 Check iftheantennapathis good ~-~- ForLSn50v2 series endnode==97 +== 3.1 Check the use environment == 97 97 98 98 99 -a) Open Enclosure and Check if the antenna connection to module is good. 100 - 101 -b) check if the connector match. 102 - 103 - 104 -[[image:image-20221016081725-1.png||height="426" width="706"]] 105 - 106 - 107 - 108 -= 4. Installation Guidelines = 109 - 110 -== 4.1 Check the use environment == 111 - 112 - 113 113 First , User should notice: Radio link quality and performances are highly dependent of the environment. 114 114 115 115 (% style="color:blue" %)**Better performances can be reached with:** ... ... @@ -119,6 +119,8 @@ 119 119 * No high level radio interferes in the ISM band you use. 120 120 * At least 1 meter above the ground. 121 121 109 + 110 + 122 122 (% style="color:blue" %)**Radio performances are degraded with:** 123 123 124 124 * Obstacles: buildings, trees... ... ... @@ -128,7 +128,7 @@ 128 128 129 129 130 130 131 -== 4.2 Improve the Antenna ==120 +== 3.2 Improve the Antenna == 132 132 133 133 134 134 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. ... ... @@ -135,9 +135,9 @@ 135 135 136 136 137 137 138 -= 5. Some real-world case =127 += 4. Some real-world case = 139 139 140 -== 5.1 Server reason cause end node has problem on Join. ==129 +== 4.1 Server reason cause end node has problem on Join. == 141 141 142 142 143 143 In one case, the customer is using AWS IoT Core and gateway to connect to AWS via Basic Station Connection, Frequency Band is AU915 sub-band 2. For some unknown reason, AWS always set downlink power to 0dBm, which cause the gateway only emit a very low power and lead to a short distance for sensor. ... ... @@ -153,25 +153,4 @@ 153 153 154 154 Reference Link: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Change%20Gateway%20Power/#H1.A0Overview>>http://wiki.dragino.com/xwiki/bin/view/Main/Change%20Gateway%20Power/#H1.A0Overview]] 155 155 156 - 157 -== 5.2 Chirpstack Default settings to 64 channels which cause Signal Poor. == 158 - 159 - 160 -In this case, User use a Chirpstack LoRaWAN server with default settings. The Frequency Band is US915 and default settings of Chirpstack has all channels ( All sub-bands , total 72 channels) enable. User use a LDS03A and a LPS8N LoRaWAN gateway for the test. 161 - 162 - 163 -There is a strange issue: LDS03 has a very good RSSI ( RSSI=-40) during OTAA Join. But The LDS03A give a very poor RSSI after OTAA Join. After debug, it proves that the issue is with ChirpStack Frequency band settings. The ChirpStack server enables all 72 channels and the LDS03A will also use all channels after OTAA Join, but the LPS8N only can support 8 channels and set to Sub-Band2. When the LDS03A sends an uplink packet in the channel LPS8N doesn't support, because LDS03A is very close to LPS8N, LPS8N pick up this not support frequency and send to server. So in the platform we see a uplink packet with very poor RSSI. 164 - 165 - 166 -Above issue was confirmed and solved after set the ChirpStack support channels to sub-band2. See below for photos during debug. 167 - 168 -[[image:image-20221031233628-2.png]] 169 - 170 - 171 -[[image:image-20221031233759-3.png]] 172 - 173 - 174 - 175 - 176 - 177 177
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