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1		-XWiki.Xiaoling
	1	+XWiki.Kilight

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1		-= Introduction =
	1	+= Overview: =
2	2
	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.
	4	+
	5	+
	6	+= Change Power for Semtech UDP Paket forward connection =
	7	+
3	3	----
4	4
5		-(((
6		-In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
7		-)))
	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.
8	8
9		-(((
10		-Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
11		-)))
	12	+Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
12	12
	14	+
13	13	(% class="box" %)
14	14	(((
15		-(((
16	16	"tx_lut_3": {
17	17	"desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
18	18	"pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
...	...	@@ -27,16 +27,65 @@
27	27	"rf_power": 16,
28	28	"dig_gain": 0
29	29	)))
30		-)))
31	31
32		-(((
33		-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.
34		-)))
	32	+(% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.
35	35
	34	+
	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.
	36	+
	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.
	38	+
	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
	40	+
	41	+
	42	+= Change Power for LoRaWAN Basic Station connection =
	43	+
	44	+----
	45	+
	46	+First, you need to find out what is the chip module of the gateway?
	47	+
	48	+(% class="box infomessage" %)
36	36	(((
37		-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.
	50	+cat /var/iot/chip
38	38	)))
39	39
	53	+[[image:image-20220623140335-1.png||height="241" width="378"]]
	54	+
	55	+Gateways using the SX1301 LoRaWAN Concentrator are the LG308 and DLOS8.
	56	+
	57	+
	58	+**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
	59	+
	60	+Gateway maintains a power index in the file: /etc/station/station-sx1301.conf for example:
	61	+
	62	+(% class="box" %)
40	40	(((
41		-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
	64	+{
	65	+ /* If slave-X.conf present this acts as default settings */
	66	+ "SX1301_conf": { /* Actual channel plan is controlled by server */
	67	+ "lorawan_public": true, /* is default */
	68	+ "clksrc": 1, /* radio_1 provides clock to concentrator */
	69	+ /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
	70	+ "device": "/dev/spidev1.0",
	71	+ /* freq/enable provided by LNS - only HW specific settings listed here */
	72	+
	73	+ ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ](% %)
	74	+
	75	+ "radio_0": {
	76	+ "type": "SX1257",
	77	+ "rssi_offset": -166.0,
	78	+ "tx_enable": true,
	79	+ "antenna_gain": 0
	80	+ },
	81	+ "radio_1": {
	82	+ "type": "SX1257",
	83	+ "rssi_offset": -166.0,
	84	+ "tx_enable": false
	85	+ }
	86	+ /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
	87	+ },
42	42	)))
	89	+
	90	+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.
	91	+
	92	+

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