Wiki source code of Change Gateway Power

Version 18.2 by Xiaoling on 2022/07/22 15:07

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