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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 6.1
edited by Edwin Chen
on 2022/06/20 17:46
Change comment: There is no comment for this version
To version 18.4
edited by Xiaoling
on 2022/07/22 15:14
Change comment: There is no comment for this version

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1 -XWiki.Edwin
1 +XWiki.Xiaoling
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1 -= Introduction =
1 +(% class="wikigeneratedid" %)
2 +**Table of Contents:**
2 2  
3 -----
4 +{{toc/}}
4 4  
5 -In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
6 6  
7 -Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
8 8  
9 9  
9 += 1.  Overview =
10 +
11 +
12 +(((
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.
14 +)))
15 +
16 +
17 += 2.  Change Power for Semtech UDP Paket forward connection =
18 +
19 +
20 +(((
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.
22 +)))
23 +
24 +(((
25 +Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
26 +)))
27 +
28 +
10 10  (% class="box" %)
11 11  (((
12 12  "tx_lut_3": {
13 13   "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
14 - "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.
15 15   "mix_gain": 10,
16 16   "rf_power": 15,
17 17   "dig_gain": 1
... ... @@ -24,11 +24,150 @@
24 24   "dig_gain": 0
25 25  )))
26 26  
27 -(% class="mark" %)Note: If when lorawan server specify a rf_power which is not list above. gateway will choose the closest power. profile.
28 28  
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.**
49 +)))
29 29  
30 -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.
31 31  
32 -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 recommended, because this might break the regulator for specific country.
52 +(((
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.
54 +)))
33 33  
34 -Please note, that the global_conf.json file will be overwritten by the match region files in /etc/lora/cfg-30x when changing settings in the web. So user needs to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
56 +(((
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.
58 +)))
59 +
60 +(((
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
62 +)))
63 +
64 +
65 += 3.  Change Power for LoRaWAN Basic Station connection =
66 +
67 +
68 +(((
69 +First, you need to find out what is the chip module of the gateway?
70 +)))
71 +
72 +(% class="box infomessage" %)
73 +(((
74 +**cat /var/iot/chip **
75 +)))
76 +
77 +[[image:image-20220623140335-1.png||height="241" width="378"]]
78 +
79 +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]].
80 +
81 +
82 +(% style="color:blue" %)**SX1301 Change Power for LoRaWAN Basic Station Connection example:**
83 +
84 +Gateway maintains a power index in the file: /etc/station/station-sx1301.conf
85 +
86 +(% class="box" %)
87 +(((
88 +{
89 + /* If slave-X.conf present this acts as default settings */
90 + "SX1301_conf": { /* Actual channel plan is controlled by server */
91 + "lorawan_public": true, /* is default */
92 + "clksrc": 1, /* radio_1 provides clock to concentrator */
93 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
94 + "device": "/dev/spidev1.0",
95 + /* freq/enable provided by LNS - only HW specific settings listed here */
96 +
97 + ~|<~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-(% style="color:red" %)Add parameters:"tx_gain_lut"  :  [ TX_GAIN_LUT, .. ]
98 +
99 + "radio_0": {
100 + "type": "SX1257",
101 + "rssi_offset": -166.0,
102 + "tx_enable": true,
103 + "antenna_gain": 0
104 + },
105 + "radio_1": {
106 + "type": "SX1257",
107 + "rssi_offset": -166.0,
108 + "tx_enable": false
109 + }
110 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
111 + },
112 +)))
113 +
114 +
115 +Add parameters:**"(% style="color:blue" %)tx_gain_lut": [ TX_GAIN_LUT, .. ](%%)**
116 +
117 +(% class="box" %)
118 +(((
119 +{
120 + /* If slave-X.conf present this acts as default settings */
121 + "SX1301_conf": { /* Actual channel plan is controlled by server */
122 + "lorawan_public": true, /* is default */
123 + "clksrc": 1, /* radio_1 provides clock to concentrator */
124 + /* path to the SPI device, un-comment if not specified on the command line e.g., RADIODEV=/dev/spidev0.0 */
125 + "device": "/dev/spidev1.0",
126 + /* freq/enable provided by LNS - only HW specific settings listed here */
127 + "tx_gain_lut":[
128 + {"rf_power": 12, "pa_gain": 2, "mix_gain": 11, "dig_gain": 2, "dac_gain": 3}, 
129 + {"rf_power": 13, "pa_gain": 2, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
130 + {"rf_power": 14, "pa_gain": 2, "mix_gain": 12, "dig_gain": 2, "dac_gain": 3},
131 + {"rf_power": 15, "pa_gain": 2, "mix_gain": 13, "dig_gain": 2, "dac_gain": 3},
132 +
133 +/* Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain */
134 +
135 +/* to the value mentioned here so as to generate 15dB output power.*/
136 + {"rf_power": 16, "pa_gain": 2, "mix_gain": 13, "dig_gain": 1, "dac_gain": 3},
137 + {"rf_power": 17, "pa_gain": 2, "mix_gain": 14, "dig_gain": 1, "dac_gain": 3},
138 + {"rf_power": 18, "pa_gain": 2, "mix_gain": 15, "dig_gain": 2, "dac_gain": 3},
139 + {"rf_power": 19, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
140 + {"rf_power": 20, "pa_gain": 2, "mix_gain": 15, "dig_gain": 1, "dac_gain": 3},
141 + {"rf_power": 21, "pa_gain": 3, "mix_gain": 9, "dig_gain": 0, "dac_gain": 3},
142 + {"rf_power": 22, "pa_gain": 3, "mix_gain": 10, "dig_gain": 0, "dac_gain": 3},
143 + {"rf_power": 23, "pa_gain": 3, "mix_gain": 11, "dig_gain": 1, "dac_gain": 3},
144 + {"rf_power": 24, "pa_gain": 3, "mix_gain": 12, "dig_gain": 0, "dac_gain": 3},
145 + {"rf_power": 25, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
146 + {"rf_power": 26, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3},
147 + {"rf_power": 27, "pa_gain": 3, "mix_gain": 14, "dig_gain": 0, "dac_gain": 3}
148 + ],
149 + "radio_0": {
150 + "type": "SX1257",
151 + "rssi_offset": -166.0,
152 + "tx_enable": true,
153 + "antenna_gain": 0
154 + },
155 + "radio_1": {
156 + "type": "SX1257",
157 + "rssi_offset": -166.0,
158 + "tx_enable": false
159 + }
160 + /* chan_multiSF_X, chan_Lora_std, chan_FSK provided by LNS */
161 + },
162 +)))
163 +
164 +(((
165 +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]]
166 +)))
167 +
168 +
169 +(((
170 +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.
171 +)))
172 +
173 +(((
174 +(% style="color:red" %)**Note: When the Settings are complete, click "Save&Apply" on the gateway's Web UI**
175 +)))
176 +
177 +
178 += 4.  Checking station Logs =
179 +
180 +
181 +(((
182 +Run the command:
183 +)))
184 +
185 +(% class="box infomessage" %)
186 +(((
187 +**tail -f /var/iot/station.log**
188 +)))
189 +
190 +[[image:image-20220623145437-2.png||height="501" width="694"]]
191 +
192 +
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