Wiki source code of Change Gateway Power

Version 13.1 by Kilight Cao on 2022/06/23 14:23

version	line-number	content
8.1	1	= Overview: =
	2
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.
8.1	4
	5
7.1	6	= Change Power for Semtech UDP Paket forward connection =
1.3	7
4.1	8	----
	9
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.
1.3	11
9.1	12	Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
1.3	13
5.1	14
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	)))
	31
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.
5.1	33
6.1	34
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.
1.3	36
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.
1.3	38
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
7.1	40
	41
9.1	42	= Change Power for LoRaWAN Basic Station connection =
7.1	43
9.1	44	----
	45
10.1	46	First, you need to find out what is the chip module of the gateway?
9.1	47
10.1	48	(% class="box infomessage" %)
	49	(((
	50	cat /var/iot/chip
	51	)))
	52
12.1	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:
13.1	61
10.1	62	(% class="box" %)
	63	(((
12.1	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 */
13.1	72
	73	~\|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut" : [ TX_GAIN_LUT, .. ](% %)
	74
12.1	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	},
10.1	88	)))
13.1	89
9.1	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

Wiki source code of Change Gateway Power

Applications

Navigation