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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 1.2
edited by Xiaoling
on 2022/05/14 13:43
Change comment: There is no comment for this version
To version 8.1
edited by Edwin Chen
on 2022/06/23 09:42
Change comment: There is no comment for this version

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1 -XWiki.Xiaoling
1 +XWiki.Edwin
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1 +(% class="wikigeneratedid" %)
2 += Overview: =
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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 =
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9 +----
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11 +In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
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13 +Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
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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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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.
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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.
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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 =