Wiki source code of Change Gateway Power

Version 18.3 by Xiaoling on 2022/07/22 15:13
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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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11
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.
14 )))
15
16
17 = 2.  Change Power for Semtech UDP Paket forward connection =
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19
20 (((
21 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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24 (((
25 Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
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27
28
29 (% class="box" %)
30 (((
31 "tx_lut_3": {
32 "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
33 "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
34 "mix_gain": 10,
35 "rf_power": 15,
36 "dig_gain": 1
37 },
38 "tx_lut_4": {
39 "desc": "TX gain table, index 4",
40 "pa_gain": 2,
41 "mix_gain": 10,
42 "rf_power": 16,
43 "dig_gain": 0
44 )))
45
46
47 (((
48 (% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
49 )))
50
51
52 (((
53 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.
54 )))
55
56 (((
57 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.
58 )))
59
60 (((
61 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
62 )))
63
64
65 = 3.  Change Power for LoRaWAN Basic Station connection =
66
67
68 First, you need to find out what is the chip module of the gateway?
69
70 (% class="box infomessage" %)
71 (((
72 **cat /var/iot/chip **
73 )))
74
75 [[image:image-20220623140335-1.png||height="241" width="378"]]
76
77 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]].
78
79
80 (% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
81
82 Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
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84 (% class="box" %)
85 (((
86 {
87 /* If slave-X.conf present this acts as default settings */
88 "SX1301_conf": { /* Actual channel plan is controlled by server */
89 "lorawan_public": true, /* is default */
90 "clksrc": 1, /* radio_1 provides clock to concentrator */
91 /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
92 "device": "/dev/spidev1.0",
93 /* freq/enable provided by LNS - only HW specific settings listed here */
94
95 ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
96
97 "radio_0": {
98 "type": "SX1257",
99 "rssi_offset": -166.0,
100 "tx_enable": true,
101 "antenna_gain": 0
102 },
103 "radio_1": {
104 "type": "SX1257",
105 "rssi_offset": -166.0,
106 "tx_enable": false
107 }
108 /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
109 },
110 )))
111
112
113 Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
114
115 (% class="box" %)
116 (((
117 {
118 /* If slave-X.conf present this acts as default settings */
119 "SX1301_conf": { /* Actual channel plan is controlled by server */
120 "lorawan_public": true, /* is default */
121 "clksrc": 1, /* radio_1 provides clock to concentrator */
122 /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
123 "device": "/dev/spidev1.0",
124 /* freq/enable provided by LNS - only HW specific settings listed here */
125 "tx_gain_lut":[
126 {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
127 {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
128 {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
129 {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
130
131 /* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
132
133 /* to the value mentioned here so as to generate 15dB output power.*/
134 {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
135 {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
136 {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
137 {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
138 {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
139 {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
140 {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
141 {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
142 {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
143 {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
144 {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
145 {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
146 ],
147 "radio_0": {
148 "type": "SX1257",
149 "rssi_offset": -166.0,
150 "tx_enable": true,
151 "antenna_gain": 0
152 },
153 "radio_1": {
154 "type": "SX1257",
155 "rssi_offset": -166.0,
156 "tx_enable": false
157 }
158 /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
159 },
160 )))
161
162 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]]
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164
165 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.
166
167 (% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
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169
170 = 4.  Checking station Logs =
171
172
173 Run the command:
174
175 (% class="box infomessage" %)
176 (((
177 **tail -f /var/iot/station.log**
178 )))
179
180 [[image:image-20220623145437-2.png||height="501" width="694"]]
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