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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 2.1
edited by Xiaoling
on 2022/05/14 13:48
Change comment: There is no comment for this version
To version 18.3
edited by Xiaoling
on 2022/07/22 15:13
Change comment: There is no comment for this version

Summary

Details

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1 -= Introduction =
1 +(% class="wikigeneratedid" %)
2 +**Table of Contents:**
2 2  
4 +{{toc/}}
5 +
6 +
7 +
8 +
9 += 1.  Overview =
10 +
11 +
3 3  (((
4 -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.
5 5  )))
6 6  
16 +
17 += 2.  Change Power for Semtech UDP Paket forward connection =
18 +
19 +
7 7  (((
8 -Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
21 +In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
9 9  )))
10 10  
24 +(((
25 +Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
26 +)))
27 +
28 +
11 11  (% class="box" %)
12 12  (((
13 -(((
14 14  "tx_lut_3": {
15 15   "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
16 - "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
33 + "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
17 17   "mix_gain": 10,
18 18   "rf_power": 15,
19 19   "dig_gain": 1
... ... @@ -25,24 +25,141 @@
25 25   "rf_power": 16,
26 26   "dig_gain": 0
27 27  )))
45 +
46 +
47 +(((
48 +(% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
28 28  )))
29 29  
51 +
30 30  (((
31 -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.
53 +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.
32 32  )))
33 33  
34 34  (((
35 -
57 +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.
36 36  )))
37 37  
38 38  (((
39 -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.
61 +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
40 40  )))
41 41  
64 +
65 += 3.  Change Power for LoRaWAN Basic Station connection =
66 +
67 +
68 +First, you need to find out what is the chip module of the gateway?
69 +
70 +(% class="box infomessage" %)
42 42  (((
43 -
72 +**cat /var/iot/chip **
44 44  )))
45 45  
75 +[[image:image-20220623140335-1.png||height="241" width="378"]]
76 +
77 +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]].
78 +
79 +
80 +(% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
81 +
82 +Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
83 +
84 +(% class="box" %)
46 46  (((
47 -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
86 +{
87 + /* If slave-X.conf present this acts as default settings */
88 + "SX1301_conf": { /* Actual channel plan is controlled by server */
89 + "lorawan_public": true, /* is default */
90 + "clksrc": 1, /* radio_1 provides clock to concentrator */
91 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
92 + "device": "/dev/spidev1.0",
93 + /* freq/enable provided by LNS - only HW specific settings listed here */
94 +
95 + ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
96 +
97 + "radio_0": {
98 + "type": "SX1257",
99 + "rssi_offset": -166.0,
100 + "tx_enable": true,
101 + "antenna_gain": 0
102 + },
103 + "radio_1": {
104 + "type": "SX1257",
105 + "rssi_offset": -166.0,
106 + "tx_enable": false
107 + }
108 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
109 + },
48 48  )))
111 +
112 +
113 +Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
114 +
115 +(% class="box" %)
116 +(((
117 +{
118 + /* If slave-X.conf present this acts as default settings */
119 + "SX1301_conf": { /* Actual channel plan is controlled by server */
120 + "lorawan_public": true, /* is default */
121 + "clksrc": 1, /* radio_1 provides clock to concentrator */
122 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
123 + "device": "/dev/spidev1.0",
124 + /* freq/enable provided by LNS - only HW specific settings listed here */
125 + "tx_gain_lut":[
126 + {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
127 + {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
128 + {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
129 + {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
130 +
131 +/* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
132 +
133 +/* to the value mentioned here so as to generate 15dB output power.*/
134 + {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
135 + {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
136 + {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
137 + {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
138 + {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
139 + {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
140 + {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
141 + {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
142 + {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
143 + {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
144 + {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
145 + {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
146 + ],
147 + "radio_0": {
148 + "type": "SX1257",
149 + "rssi_offset": -166.0,
150 + "tx_enable": true,
151 + "antenna_gain": 0
152 + },
153 + "radio_1": {
154 + "type": "SX1257",
155 + "rssi_offset": -166.0,
156 + "tx_enable": false
157 + }
158 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
159 + },
160 +)))
161 +
162 +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]]
163 +
164 +
165 +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.
166 +
167 +(% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
168 +
169 +
170 += 4.  Checking station Logs =
171 +
172 +
173 +Run the command:
174 +
175 +(% class="box infomessage" %)
176 +(((
177 +**tail -f /var/iot/station.log**
178 +)))
179 +
180 +[[image:image-20220623145437-2.png||height="501" width="694"]]
181 +
182 +
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