Changes for page How to improve LoRaWAN distance
Last modified by Xiaoling on 2024/08/16 11:25
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... ... @@ -4,8 +4,6 @@ 4 4 5 5 6 6 7 - 8 - 9 9 = 1. OverView = 10 10 11 11 ... ... @@ -12,6 +12,7 @@ 12 12 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. 13 13 14 14 13 + 15 15 = 2. Analyze at the software side = 16 16 17 17 == 2.1 LoRa parameters that effect distance == ... ... @@ -37,10 +37,10 @@ 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:#f 2f2f2; 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" %)(((39 +(% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %) 40 +|(% 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:#d9e2f3;width:102px" %)**Band Width**42 +)))|(% 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 ... ... @@ -50,7 +50,7 @@ 50 50 == 2.2 Adaptive Data Rate (ADR) and set max distance == 51 51 52 52 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.52 +**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. 54 54 55 55 56 56 By default, ADR is turn on((% style="color:#037691" %)**AT+ADR=1**) (%%)so End node ADR feature is enable. ... ... @@ -60,14 +60,15 @@ 60 60 61 61 (% style="color:#037691" %)**AT+ADR=0** 62 62 63 -(% style="color:#037691" %)**AT+DR=0 ~/~/(%%) Use longest distance modulation62 +(% style="color:#037691" %)**AT+DR=0** 64 64 65 -(% style="color:#037691" %)**AT+TXP=0 (%%)~/~/ Use max power For EU868, max power can be is AT+TXP=5064 +(% style="color:#037691" %)**AT+TXP=0** 66 66 67 67 68 68 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. 69 69 70 70 70 + 71 71 == 2.3 Check for short distance problem == 72 72 73 73 ... ... @@ -80,37 +80,25 @@ 80 80 [[image:image-20221006185826-3.png]] 81 81 82 82 83 + 83 83 == 2.4 Best software settings for the longest distance == 84 84 85 85 86 86 Below are the settings for longest distance transmission. ( will reduce battery life) 87 87 88 -* (% style="color:#037691" %)**AT+ADR=0** 89 -* (% style="color:#037691" %)**AT+DR= 0** ,the longest distance modulation90 -* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power For EU868, max power can be is AT+TXP=5089 +* (% style="color:#037691" %)**AT+ADR=0** (%%)~/~/ Disable ADR 90 +* (% style="color:#037691" %)**AT+DR= 0** (%%)~/~/ Use the smallest DR 91 +* (% style="color:#037691" %)**AT+TXP=0** (%%) ~/~/ Use max power. 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)OpenEnclosure andCheck iftheantennaconnectionomodule is good.100 +First , User should notice: Radio link quality and performances are highly dependent of the environment. 100 100 101 -b) check if the connector match. 102 - 103 - 104 -[[image:image-20221016081725-1.png||height="426" width="706"]] 105 - 106 - 107 -= 4. Installation Guidelines = 108 - 109 -== 4.1 Check the use environment == 110 - 111 - 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. 113 - 114 114 (% style="color:blue" %)**Better performances can be reached with:** 115 115 116 116 * Outdoor environment. ... ... @@ -118,6 +118,8 @@ 118 118 * No high level radio interferes in the ISM band you use. 119 119 * At least 1 meter above the ground. 120 120 109 + 110 + 121 121 (% style="color:blue" %)**Radio performances are degraded with:** 122 122 123 123 * Obstacles: buildings, trees... ... ... @@ -127,17 +127,18 @@ 127 127 128 128 129 129 130 -== 4.2 Improve the Antenna ==120 +== 3.2 Improve the Antenna == 131 131 132 132 133 133 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. 134 134 135 135 136 -= 5. Some real-world case = 137 137 138 -= =5.1Serverreasoncauseend node has problem on Join.==127 += 4. Some real-world case = 139 139 129 +== 4.1 Server reason cause end node has problem on Join. == 140 140 131 + 141 141 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. 142 142 143 143 ... ... @@ -151,32 +151,4 @@ 151 151 152 152 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]] 153 153 154 - 155 -== 5.2 Chirpstack Default settings to 64 channels which cause Signal Poor. == 156 - 157 - 158 -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. 159 - 160 - 161 -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. 162 - 163 - 164 -Above issue was confirmed and solved after set the ChirpStack support channels to sub-band2. See below for photos during debug. 165 - 166 -[[image:image-20221031233628-2.png]] 167 - 168 - 169 -[[image:image-20221031233759-3.png]] 170 - 171 - 172 -[[image:image-20221101000006-1.png||height="353" width="931"]] 173 - 174 - 175 -= 6. Use a repeater = 176 - 177 - 178 -In some cases, user can consider use a repeater for limitation transmition. 179 - 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 - 182 182
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