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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 1.1
edited by Xiaoling
on 2022/05/14 13:43
Change comment: There is no comment for this version
To version 17.1
edited by Kilight Cao
on 2022/06/23 14:54
Change comment: Uploaded new attachment "image-20220623145437-2.png", version {1}

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1 -XWiki.Xiaoling
1 +XWiki.Kilight
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1 -{{box cssClass="floatinginfobox" title="**Contents**"}}
2 -{{toc/}}
3 -{{/box}}
1 += Overview: =
4 4  
5 -= Paragraph 1 =
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.
6 6  
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8 8  
9 -== Sub-paragraph ==
6 += Change Power for Semtech UDP Paket forward connection =
10 10  
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8 +----
12 12  
13 -== Sub-paragraph ==
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.
14 14  
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12 +Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
16 16  
17 -=== Sub-sub paragraph ===
18 18  
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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 +)))
20 20  
32 +(% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.
21 21  
22 -= Paragraph 2 =
23 23  
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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.
25 25  
26 -== Sub-paragraph ==
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.
27 27  
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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
29 29  
30 -== Sub-paragraph ==
31 31  
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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>>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 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 +**Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]**
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 +
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