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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 10.1
edited by Kilight Cao
on 2022/06/23 14:00
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

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1 +XWiki.Xiaoling
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1 -= Overview: =
1 +(% class="wikigeneratedid" %)
2 +**Table of Contents:**
2 2  
4 +{{toc/}}
5 +
6 +
7 +
8 +
9 += 1.  Overview =
10 +
11 +
12 +(((
3 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.
14 +)))
4 4  
5 5  
6 -= Change Power for Semtech UDP Paket forward connection =
17 += 2.  Change Power for Semtech UDP Paket forward connection =
7 7  
8 -----
9 9  
20 +(((
10 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.
22 +)))
11 11  
24 +(((
12 12  Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
26 +)))
13 13  
14 14  
15 15  (% class="box" %)
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16 16  (((
17 17  "tx_lut_3": {
18 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.
33 + "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
20 20   "mix_gain": 10,
21 21   "rf_power": 15,
22 22   "dig_gain": 1
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29 29   "dig_gain": 0
30 30  )))
31 31  
32 -(% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.
33 33  
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 +)))
34 34  
51 +
52 +(((
35 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.
54 +)))
36 36  
56 +(((
37 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.
58 +)))
38 38  
60 +(((
39 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
62 +)))
40 40  
41 41  
42 -= Change Power for LoRaWAN Basic Station connection =
65 += 3.  Change Power for LoRaWAN Basic Station connection =
43 43  
44 -----
45 45  
46 46  First, you need to find out what is the chip module of the gateway?
47 47  
48 48  (% class="box infomessage" %)
49 49  (((
50 -cat /var/iot/chip
72 +**cat /var/iot/chip **
51 51  )))
52 52  
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 +
53 53  (% class="box" %)
54 54  (((
55 -root@dragino-1bbe0c:~~# cat /var/iot/chip 
56 -sx1301
57 -root@dragino-1bbe0c:~~#
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 + },
58 58  )))
59 59  
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 +
60 60  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.
61 61  
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 +
62 62  
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