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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 18.2
edited by Xiaoling
on 2022/07/22 15:07
Change comment: There is no comment for this version
To version 1.1
edited by Xiaoling
on 2022/05/14 13:43
Change comment: There is no comment for this version

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1 -(% class="wikigeneratedid" %)
2 -**Table of Contents:**
3 -
1 +{{box cssClass="floatinginfobox" title="**Contents**"}}
4 4  {{toc/}}
3 +{{/box}}
5 5  
5 += Paragraph 1 =
6 6  
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7 7  
9 +== Sub-paragraph ==
8 8  
9 -= 1.  Overview =
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10 10  
13 +== Sub-paragraph ==
11 11  
12 -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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13 13  
17 +=== Sub-sub paragraph ===
14 14  
15 -= 2.  Change Power for Semtech UDP Paket forward connection =
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16 16  
17 17  
18 -In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
22 += Paragraph 2 =
19 19  
20 -Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
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21 21  
26 +== Sub-paragraph ==
22 22  
23 -(% class="box" %)
24 -(((
25 -"tx_lut_3": {
26 - "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
27 - "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
28 - "mix_gain": 10,
29 - "rf_power": 15,
30 - "dig_gain": 1
31 -},
32 -"tx_lut_4": {
33 - "desc": "TX gain table, index 4",
34 - "pa_gain": 2,
35 - "mix_gain": 10,
36 - "rf_power": 16,
37 - "dig_gain": 0
38 -)))
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39 39  
30 +== Sub-paragraph ==
40 40  
41 -(% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
42 -
43 -
44 -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.
45 -
46 -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.
47 -
48 -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
49 -
50 -
51 -= 3.  Change Power for LoRaWAN Basic Station connection =
52 -
53 -
54 -First, you need to find out what is the chip module of the gateway?
55 -
56 -(% class="box infomessage" %)
57 -(((
58 -**cat /var/iot/chip **
59 -)))
60 -
61 -[[image:image-20220623140335-1.png||height="241" width="378"]]
62 -
63 -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]].
64 -
65 -
66 -(% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
67 -
68 -Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
69 -
70 -(% class="box" %)
71 -(((
72 -{
73 - /* If slave-X.conf present this acts as default settings */
74 - "SX1301_conf": { /* Actual channel plan is controlled by server */
75 - "lorawan_public": true, /* is default */
76 - "clksrc": 1, /* radio_1 provides clock to concentrator */
77 - /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
78 - "device": "/dev/spidev1.0",
79 - /* freq/enable provided by LNS - only HW specific settings listed here */
80 -
81 - ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
82 -
83 - "radio_0": {
84 - "type": "SX1257",
85 - "rssi_offset": -166.0,
86 - "tx_enable": true,
87 - "antenna_gain": 0
88 - },
89 - "radio_1": {
90 - "type": "SX1257",
91 - "rssi_offset": -166.0,
92 - "tx_enable": false
93 - }
94 - /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
95 - },
96 -)))
97 -
98 -
99 -Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
100 -
101 -(% class="box" %)
102 -(((
103 -{
104 - /* If slave-X.conf present this acts as default settings */
105 - "SX1301_conf": { /* Actual channel plan is controlled by server */
106 - "lorawan_public": true, /* is default */
107 - "clksrc": 1, /* radio_1 provides clock to concentrator */
108 - /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
109 - "device": "/dev/spidev1.0",
110 - /* freq/enable provided by LNS - only HW specific settings listed here */
111 - "tx_gain_lut":[
112 - {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
113 - {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
114 - {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
115 - {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
116 -
117 -/* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
118 -
119 -/* to the value mentioned here so as to generate 15dB output power.*/
120 - {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
121 - {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
122 - {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
123 - {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
124 - {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
125 - {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
126 - {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
127 - {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
128 - {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
129 - {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
130 - {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
131 - {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
132 - ],
133 - "radio_0": {
134 - "type": "SX1257",
135 - "rssi_offset": -166.0,
136 - "tx_enable": true,
137 - "antenna_gain": 0
138 - },
139 - "radio_1": {
140 - "type": "SX1257",
141 - "rssi_offset": -166.0,
142 - "tx_enable": false
143 - }
144 - /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
145 - },
146 -)))
147 -
148 -See this link for more station configuration parameters: [[Concentrator Design (v1.5) - LoRa Basics™ StationLoRa Basics™ Station ~| DEVELOPER PORTAL (semtech.com)>>url:https://lora-developers.semtech.com/build/software/lora-basics/lora-basics-for-gateways/?url=gw_v1.5.html]]
149 -
150 -
151 -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.
152 -
153 -(% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
154 -
155 -
156 -= 4.  Checking station Logs =
157 -
158 -
159 -Run the command:
160 -
161 -(% class="box infomessage" %)
162 -(((
163 -**tail -f /var/iot/station.log**
164 -)))
165 -
166 -[[image:image-20220623145437-2.png||height="501" width="694"]]
167 -
168 -
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