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Author

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1		-XWiki.Edwin
	1	+XWiki.Xiaoling

Content

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1	1	= Introduction =
2	2
3		-----
4		-
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5	5	In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
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6	6
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7	7	Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
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8	8
9		-
10	10	(% class="box" %)
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12	12	"tx_lut_3": {
13	13	"desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
14	14	"pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
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23	23	"rf_power": 16,
24	24	"dig_gain": 0
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26	26
27		-
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28	28	When LoRaWAN server sends a downlink stream, server will also ask the gateway to use which rf_power as output. So user don't need to consider to control in the gateway side.
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29	29
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30	30	If user want to always use a higher power or a lower power. User can modify the pa_gain,mix_gain,dig_gain for specify rf_power to achieve this purpose. This is not recommend, because this might break the regulator for specify country.
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31	31
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32	32	Please note, the global_conf.json file will be overwrite by the match region files in /etc/lora/cfg-30x when change settings in the web. So user need to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
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