Wiki source code of Change Gateway Power
Version 15.1 by Kilight Cao on 2022/06/23 14:42
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| author | version | line-number | content |
|---|---|---|---|
| 1 | = Overview: = | ||
| 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 | |||
| 8 | ---- | ||
| 9 | |||
| 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. | ||
| 11 | |||
| 12 | Gateway maintains a power index in the file: /etc/lora/global_conf.json for example: | ||
| 13 | |||
| 14 | |||
| 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 | |||
| 32 | (% 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 = | ||
| 43 | |||
| 44 | ---- | ||
| 45 | |||
| 46 | First, you need to find out what is the chip module of the gateway? | ||
| 47 | |||
| 48 | (% class="box infomessage" %) | ||
| 49 | ((( | ||
| 50 | cat /var/iot/chip | ||
| 51 | ))) | ||
| 52 | |||
| 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" %) | ||
| 63 | ((( | ||
| 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 | }, | ||
| 88 | ))) | ||
| 89 | |||
| 90 | |||
| 91 | |||
| 92 | (% class="box" %) | ||
| 93 | ((( | ||
| 94 | { | ||
| 95 | /* 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}, ~/~/ Index 0 refer to rf_power: 12dB. device will set the pa_gain,mix_gain,dig_gain | ||
| 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 | {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3}, | ||
| 108 | {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3}, | ||
| 109 | {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3}, | ||
| 110 | {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3}, | ||
| 111 | {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3}, | ||
| 112 | {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3}, | ||
| 113 | {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3}, | ||
| 114 | {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3}, | ||
| 115 | {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3}, | ||
| 116 | {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}, | ||
| 117 | {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}, | ||
| 118 | {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3} | ||
| 119 | ], | ||
| 120 | "radio_0": { | ||
| 121 | "type": "SX1257", | ||
| 122 | "rssi_offset": -166.0, | ||
| 123 | "tx_enable": true, | ||
| 124 | "antenna_gain": 0 | ||
| 125 | }, | ||
| 126 | "radio_1": { | ||
| 127 | "type": "SX1257", | ||
| 128 | "rssi_offset": -166.0, | ||
| 129 | "tx_enable": false | ||
| 130 | } | ||
| 131 | /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */ | ||
| 132 | }, | ||
| 133 | ))) | ||
| 134 | |||
| 135 | 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. | ||
| 136 | |||
| 137 |