Wiki source code of Change Gateway Power

Version 8.1 by Edwin Chen on 2022/06/23 09:42

version	line-number	content
8.1	1	(% class="wikigeneratedid" %)
	2	= Overview: =
	3
	4	In LoRaWAN protocol, the gateway transmit packet use the output power base on the Power Index from LoRaWAN server downlink. for example: LoRaWAN server send downlink with this info "rf_power=14", gatewat 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 case, the LoRaWAN server might set the rf-power to a quite low value ( for example 0dB) which is not practical for use. In such case, User can manunal change the rf_power=0's rf settings to a higher power out. Below are the methods.
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7.1	7	= Change Power for Semtech UDP Paket forward connection =
1.3	8
4.1	9	----
	10
1.3	11	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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	13	Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
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5.1	15
1.3	16	(% class="box" %)
	17	(((
	18	"tx_lut_3": {
	19	"desc": "TX gain table, index 3", ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
	20	"pa_gain": 2, ~/~/ to the value mentioned here so to generate 15dB output power.
	21	"mix_gain": 10,
	22	"rf_power": 15,
	23	"dig_gain": 1
	24	},
	25	"tx_lut_4": {
	26	"desc": "TX gain table, index 4",
	27	"pa_gain": 2,
	28	"mix_gain": 10,
	29	"rf_power": 16,
	30	"dig_gain": 0
	31	)))
	32
6.1	33	(% class="mark" %)Note: If when lorawan server specify a rf_power which is not list above. gateway will choose the closest power. profile.
5.1	34
6.1	35
1.3	36	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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6.1	38	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 recommended, because this might break the regulator for specific country.
1.3	39
6.1	40	Please note, that the global_conf.json file will be overwritten by the match region files in /etc/lora/cfg-30x when changing settings in the web. So user needs to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
7.1	41
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	44	= Change Power for LoRaWAN Basic Station connection =

Wiki source code of Change Gateway Power

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