Wiki source code of Change Gateway Power
Version 8.1 by Edwin Chen on 2022/06/23 09:42
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| author | version | line-number | content |
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| 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 | = Change Power for Semtech UDP Paket forward connection = | ||
| 8 | |||
| 9 | ---- | ||
| 10 | |||
| 11 | In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server. | ||
| 12 | |||
| 13 | Gateway maintain a power index in the file: /etc/lora/global_conf.json for example: | ||
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| 15 | |||
| 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 | |||
| 33 | (% class="mark" %)Note: If when lorawan server specify a rf_power which is not list above. gateway will choose the closest power. profile. | ||
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| 35 | |||
| 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. | ||
| 37 | |||
| 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. | ||
| 39 | |||
| 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 | ||
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| 44 | = Change Power for LoRaWAN Basic Station connection = |