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Changes for page Change Gateway Power

Last modified by Xiaoling on 2022/08/10 15:18
From version 18.3
edited by Xiaoling
on 2022/07/22 15:13
Change comment: There is no comment for this version
To version 9.1
edited by Kilight Cao
on 2022/06/23 11:55
Change comment: There is no comment for this version

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1 -XWiki.Xiaoling
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1 -(% class="wikigeneratedid" %)
2 -**Table of Contents:**
1 += Overview: =
3 3  
4 -{{toc/}}
5 -
6 -
7 -
8 -
9 -= 1.  Overview =
10 -
11 -
12 -(((
13 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 15  
16 16  
17 -= 2.  Change Power for Semtech UDP Paket forward connection =
6 += Change Power for Semtech UDP Paket forward connection =
18 18  
8 +----
19 19  
20 -(((
21 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 23  
24 -(((
25 25  Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
26 -)))
27 27  
28 28  
29 29  (% class="box" %)
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30 30  (((
31 31  "tx_lut_3": {
32 32   "desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain 
33 - "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
19 + "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
34 34   "mix_gain": 10,
35 35   "rf_power": 15,
36 36   "dig_gain": 1
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43 43   "dig_gain": 0
44 44  )))
45 45  
32 +(% class="mark" %)Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.
46 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.**
49 -)))
50 50  
51 -
52 -(((
53 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 -)))
55 55  
56 -(((
57 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 59  
60 -(((
61 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 63  
64 64  
65 -= 3.  Change Power for LoRaWAN Basic Station connection =
42 += Change Power for LoRaWAN Basic Station connection =
66 66  
44 +----
67 67  
68 -First, you need to find out what is the chip module of the gateway?
46 +When users use LoRaWAN Basic Station， How to Change the Power for the LoRaWAN Basic Station connection?
69 69  
70 -(% class="box infomessage" %)
71 -(((
72 -**cat /var/iot/chip **
73 -)))
74 -
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" %)
85 -(((
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 - },
110 -)))
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 -
165 165  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.
166 166  
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 -
182 182  
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