Wiki source code of Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
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1 (% class="wikigeneratedid" %)
2 **Table of Contents:**
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4 {{toc/}}
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9 = 1.  Overview =
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12 (((
13 In LoRaWAN protocol, the gateway transmit packet uses the output power base on the Power Index from the LoRaWAN server downlink. for example, the LoRaWAN server sends a downlink with this info** "rf_power=14"**, gateway got this info and it will search the index for rf_power=14 and use the related rf setting to set output power. In some cases, the LoRaWAN server might set the rf-power to a quite low value ( for example 0dB) which is not practical for use. In such a case, the User can manually change the **rf_power=0's** rf settings to a higher power out. Below are the methods.
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18 = 2.  Change Power for Semtech UDP Paket forward connection =
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22 In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
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26 Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
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30 (% class="box" %)
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32 "tx_lut_3": {
33 "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
34 "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
35 "mix_gain": 10,
36 "rf_power": 15,
37 "dig_gain": 1
38 },
39 "tx_lut_4": {
40 "desc": "TX gain table, index 4",
41 "pa_gain": 2,
42 "mix_gain": 10,
43 "rf_power": 16,
44 "dig_gain": 0
45 )))
46
47
48 (((
49 (% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
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53 (((
54 When the LoRaWAN server sends a downlink stream, the server will also ask the gateway to use rf_power as output. So users don't need to consider controlling on the gateway side.
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56
57 (((
58 If users want to always use a higher power or a lower power. Users can modify the pa_gain,mix_gain, and dig_gain to specify rf_power to achieve this purpose. This is not recommended, because this might break the regulator for a specific country.
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60
61 (((
62 Please note, that the global_conf.json file will be overwritten by the match region files in /etc/lora/cfg-30x when changing settings on the web. So the user needs to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
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66
67 = 3.  Change Power for LoRaWAN Basic Station connection =
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70 (((
71 First, you need to find out what is the chip module of the gateway?
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73
74 (% class="box infomessage" %)
75 (((
76 **cat /var/iot/chip **
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78
79 [[image:image-20220623140335-1.png||height="241" width="378"]]
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81 Gateways using the SX1301 LoRaWAN Concentrator are the [[LG308>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LG308-LG301/&file=Datasheet_LG308_LoRaWAN_Gateway.pdf]] and [[DLOS8>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/DLOS8/&file=DLOS8_LoRaWAN_Gateway_User_Manual_v1.3.pdf]].
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83
84 (% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
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86 Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
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88 (% class="box" %)
89 (((
90 {
91 /* If slave-X.conf present this acts as default settings */
92 "SX1301_conf": { /* Actual channel plan is controlled by server */
93 "lorawan_public": true, /* is default */
94 "clksrc": 1, /* radio_1 provides clock to concentrator */
95 /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
96 "device": "/dev/spidev1.0",
97 /* freq/enable provided by LNS - only HW specific settings listed here */
98
99 ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
100
101 "radio_0": {
102 "type": "SX1257",
103 "rssi_offset": -166.0,
104 "tx_enable": true,
105 "antenna_gain": 0
106 },
107 "radio_1": {
108 "type": "SX1257",
109 "rssi_offset": -166.0,
110 "tx_enable": false
111 }
112 /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
113 },
114 )))
115
116
117 Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
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119 (% class="box" %)
120 (((
121 {
122 /* If slave-X.conf present this acts as default settings */
123 "SX1301_conf": { /* Actual channel plan is controlled by server */
124 "lorawan_public": true, /* is default */
125 "clksrc": 1, /* radio_1 provides clock to concentrator */
126 /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
127 "device": "/dev/spidev1.0",
128 /* freq/enable provided by LNS - only HW specific settings listed here */
129 "tx_gain_lut":[
130 {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
131 {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
132 {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
133 {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
134
135 /* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
136
137 /* to the value mentioned here so as to generate 15dB output power.*/
138 {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
139 {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
140 {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
141 {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
142 {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
143 {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
144 {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
145 {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
146 {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
147 {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
148 {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
149 {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
150 ],
151 "radio_0": {
152 "type": "SX1257",
153 "rssi_offset": -166.0,
154 "tx_enable": true,
155 "antenna_gain": 0
156 },
157 "radio_1": {
158 "type": "SX1257",
159 "rssi_offset": -166.0,
160 "tx_enable": false
161 }
162 /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
163 },
164 )))
165
166 (((
167 See this link for more station configuration parameters: [[Concentrator Design (v1.5) - LoRa Basics™ StationLoRa Basics™ Station ~| DEVELOPER PORTAL (semtech.com)>>url:https://lora-developers.semtech.com/build/software/lora-basics/lora-basics-for-gateways/?url=gw_v1.5.html]]
168 )))
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171 (((
172 If users want to always use a higher power or a lower power. Users can modify the pa_gain,mix_gain, and dig_gain to specify rf_power to achieve this purpose. This is not recommended, because this might break the regulator for a specific country.
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174
175 )))
176
177 (((
178 (% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
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183 = 4.  Checking station Logs =
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186 (((
187 Run the command:
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189
190 (% class="box infomessage" %)
191 (((
192 **tail -f /var/iot/station.log**
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195 [[image:image-20220623145437-2.png||height="501" width="694"]]
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