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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 11.1
edited by Kilight Cao
on 2022/06/23 14:03
Change comment: Uploaded new attachment "image-20220623140335-1.png", version {1}

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1 -XWiki.Xiaoling
1 +XWiki.Kilight
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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.
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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.
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12 +Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
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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.
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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
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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 +(% class="box" %)
54 +(((
55 +root@dragino-1bbe0c:~~# cat /var/iot/chip 
56 +sx1301
57 +root@dragino-1bbe0c:~~#
58 +)))
59 +
60 +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.
61 +
62 +
image-20220623140335-1.png
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