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Wiki source code of Change Gateway Power

Version 11.1 by Kilight Cao on 2022/06/23 14:03
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Edwin Chen 8.1 1 = Overview: =
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Kilight Cao 9.1 3 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.
Edwin Chen 8.1 4
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Edwin Chen 7.1 6 = Change Power for Semtech UDP Paket forward connection =
Xiaoling 1.3 7
Xiaoling 4.1 8 ----
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Kilight Cao 9.1 10 In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
Xiaoling 1.3 11
Kilight Cao 9.1 12 Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
Xiaoling 1.3 13
Edwin Chen 5.1 14
Xiaoling 1.3 15 (% class="box" %)
16 (((
17 "tx_lut_3": {
18 "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
19 "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
20 "mix_gain": 10,
21 "rf_power": 15,
22 "dig_gain": 1
23 },
24 "tx_lut_4": {
25 "desc": "TX gain table, index 4",
26 "pa_gain": 2,
27 "mix_gain": 10,
28 "rf_power": 16,
29 "dig_gain": 0
30 )))
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Kilight Cao 9.1 32 (% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.
Edwin Chen 5.1 33
Edwin Chen 6.1 34
Kilight Cao 9.1 35 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.
Xiaoling 1.3 36
Kilight Cao 9.1 37 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.
Xiaoling 1.3 38
Kilight Cao 9.1 39 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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Kilight Cao 9.1 42 = Change Power for LoRaWAN Basic Station connection =
Edwin Chen 7.1 43
Kilight Cao 9.1 44 ----
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Kilight Cao 10.1 46 First, you need to find out what is the chip module of the gateway?
Kilight Cao 9.1 47
Kilight Cao 10.1 48 (% class="box infomessage" %)
49 (((
50 cat /var/iot/chip
51 )))
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53 (% class="box" %)
54 (((
55 root@dragino-1bbe0c:~~# cat /var/iot/chip 
56 sx1301
57 root@dragino-1bbe0c:~~#
58 )))
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Kilight Cao 9.1 60 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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