Change Gateway Power

= Overview: =

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 =

----

In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.

11

12

Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:

(% class="box" %)

(((

"tx_lut_3": {

"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.

"mix_gain": 10,

"rf_power": 15,

"dig_gain": 1

},

"tx_lut_4": {

"desc": "TX gain table, index 4",

"pa_gain": 2,

"mix_gain": 10,

"rf_power": 16,

"dig_gain": 0

)))

(% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.

33

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 =

----

First, you need to find out what is the chip module of the gateway?

47

48

(% class="box infomessage" %)

(((

cat /var/iot/chip

)))

[[image:image-20220623140335-1.png||height="241" width="378"]]

54

55

Gateways using the SX1301 LoRaWAN Concentrator are the [[LG308>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LG308-LG301/&file=Datasheet_LG308_LoRaWAN_Gateway.pdf]] and [[DLOS8>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/DLOS8/&file=DLOS8_LoRaWAN_Gateway_User_Manual_v1.3.pdf]].

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

(% class="box" %)

(((

{

/* 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, .. ]

"radio_0": {

"type": "SX1257",

"rssi_offset": -166.0,

"tx_enable": true,

"antenna_gain": 0

},

"radio_1": {

"type": "SX1257",

"rssi_offset": -166.0,

84

"tx_enable": false

85

}

86

/* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */

},

)))

Add parameters:**"tx_gain_lut": [ TX_GAIN_LUT, .. ]**

(% class="box" %)

(((

{

/* If slave-X.conf present this acts as default settings */

96

"SX1301_conf": { /* Actual channel plan is controlled by server */

97

"lorawan_public": true, /* is default */

98

"clksrc": 1, /* radio_1 provides clock to concentrator */

99

/* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */

100

"device": "/dev/spidev1.0",

101

/* freq/enable provided by LNS - only HW specific settings listed here */

102

"tx_gain_lut":[

103

{"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3},

104

{"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},

105

{"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},

106

{"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},

107

108

/* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */

109

110

/* to the value mentioned here so as to generate 15dB output power.*/

111

{"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},

112

{"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},

113

{"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},

114

{"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},

115

{"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},

116

{"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},

117

{"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},

118

{"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},

119

{"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},

120

{"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},

121

{"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},

122

{"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}

],

"radio_0": {

"type": "SX1257",

"rssi_offset": -166.0,

"tx_enable": true,

"antenna_gain": 0

},

"radio_1": {

"type": "SX1257",

"rssi_offset": -166.0,

133

"tx_enable": false

134

}

135

/* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */

},

)))

See this link for more station configuration parameters:[[Concentrator Design (v1.5) - LoRa Basics™ StationLoRa Basics™ Station ~| DEVELOPER PORTAL (semtech.com)>>url:https://lora-developers.semtech.com/build/software/lora-basics/lora-basics-for-gateways/?url=gw_v1.5.html]]

140

141

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.

142

143

(% style="color:red" %)Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI

144

145

=== **Checking station Logs** ===

Run the command:

(% class="box infomessage" %)