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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 4.1
edited by Xiaoling
on 2022/05/27 17:09
Change comment: There is no comment for this version
To version 18.5
edited by Xiaoling
on 2022/08/10 15:18
Change comment: There is no comment for this version

Summary

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1 -= Introduction =
1 +(% class="wikigeneratedid" %)
2 +**Table of Contents:**
2 2  
3 -----
4 +{{toc/}}
4 4  
6 +
7 +
8 +
9 += 1.  Overview =
10 +
11 +
5 5  (((
6 -In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
13 +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.
7 7  )))
8 8  
16 +
17 +
18 += 2.  Change Power for Semtech UDP Paket forward connection =
19 +
20 +
9 9  (((
10 -Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
22 +In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
11 11  )))
12 12  
25 +(((
26 +Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
27 +)))
28 +
29 +
13 13  (% class="box" %)
14 14  (((
15 -(((
16 16  "tx_lut_3": {
17 17   "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
18 - "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
34 + "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
19 19   "mix_gain": 10,
20 20   "rf_power": 15,
21 21   "dig_gain": 1
... ... @@ -27,16 +27,155 @@
27 27   "rf_power": 16,
28 28   "dig_gain": 0
29 29  )))
46 +
47 +
48 +(((
49 +(% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
30 30  )))
31 31  
52 +
32 32  (((
33 -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.
54 +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.
34 34  )))
35 35  
36 36  (((
37 -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 recommend, because this might break the regulator for specify country.
58 +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 38  )))
39 39  
40 40  (((
41 -Please note, the global_conf.json file will be overwrite by the match region files in /etc/lora/cfg-30x when change settings in the web. So user need to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
62 +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
42 42  )))
64 +
65 +
66 +
67 += 3.  Change Power for LoRaWAN Basic Station connection =
68 +
69 +
70 +(((
71 +First, you need to find out what is the chip module of the gateway?
72 +)))
73 +
74 +(% class="box infomessage" %)
75 +(((
76 +**cat /var/iot/chip **
77 +)))
78 +
79 +[[image:image-20220623140335-1.png||height="241" width="378"]]
80 +
81 +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]].
82 +
83 +
84 +(% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
85 +
86 +Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
87 +
88 +(% class="box" %)
89 +(((
90 +{
91 + /* If slave-X.conf present this acts as default settings */
92 + "SX1301_conf": { /* Actual channel plan is controlled by server */
93 + "lorawan_public": true, /* is default */
94 + "clksrc": 1, /* radio_1 provides clock to concentrator */
95 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
96 + "device": "/dev/spidev1.0",
97 + /* freq/enable provided by LNS - only HW specific settings listed here */
98 +
99 + ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
100 +
101 + "radio_0": {
102 + "type": "SX1257",
103 + "rssi_offset": -166.0,
104 + "tx_enable": true,
105 + "antenna_gain": 0
106 + },
107 + "radio_1": {
108 + "type": "SX1257",
109 + "rssi_offset": -166.0,
110 + "tx_enable": false
111 + }
112 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
113 + },
114 +)))
115 +
116 +
117 +Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
118 +
119 +(% class="box" %)
120 +(((
121 +{
122 + /* If slave-X.conf present this acts as default settings */
123 + "SX1301_conf": { /* Actual channel plan is controlled by server */
124 + "lorawan_public": true, /* is default */
125 + "clksrc": 1, /* radio_1 provides clock to concentrator */
126 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
127 + "device": "/dev/spidev1.0",
128 + /* freq/enable provided by LNS - only HW specific settings listed here */
129 + "tx_gain_lut":[
130 + {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
131 + {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
132 + {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
133 + {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
134 +
135 +/* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
136 +
137 +/* to the value mentioned here so as to generate 15dB output power.*/
138 + {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
139 + {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
140 + {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
141 + {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
142 + {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
143 + {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
144 + {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
145 + {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
146 + {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
147 + {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
148 + {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
149 + {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
150 + ],
151 + "radio_0": {
152 + "type": "SX1257",
153 + "rssi_offset": -166.0,
154 + "tx_enable": true,
155 + "antenna_gain": 0
156 + },
157 + "radio_1": {
158 + "type": "SX1257",
159 + "rssi_offset": -166.0,
160 + "tx_enable": false
161 + }
162 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
163 + },
164 +)))
165 +
166 +(((
167 +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]]
168 +)))
169 +
170 +
171 +(((
172 +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.
173 +
174 +
175 +)))
176 +
177 +(((
178 +(% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
179 +)))
180 +
181 +
182 +
183 += 4.  Checking station Logs =
184 +
185 +
186 +(((
187 +Run the command:
188 +)))
189 +
190 +(% class="box infomessage" %)
191 +(((
192 +**tail -f /var/iot/station.log**
193 +)))
194 +
195 +[[image:image-20220623145437-2.png||height="501" width="694"]]
196 +
197 +
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