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Author

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1		-XWiki.Edwin
	1	+XWiki.Xiaoling

Content

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2	2	{{toc/}}
3	3	{{/box}}
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5		-= Definition for LoRaWAN Repeater =
	5	+= 1.  Definition for LoRaWAN Repeater =
6	6
	7	+
7	7	A requirement for LoRaWAN repeater is as below:
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9	9	[[image:image-20220514080812-1.png||height="540" width="806"]]
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11	11
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13		-= Uplink Data Challenge =
	14	+= 2.  Uplink Data Challenge =
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	16	+
15	15	When there are uplink data from End Node, Repeater needs to get these packets and uplink to LoRaWAN Gateway. Then LoRaWAN Gateway uplinks the data to LoRaWAN Server. There will have below influence & Requirements:
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17	17	* A repeater is normally made by LoRaWAN Gateway which has 8 x RX channels and 1 x TX channel, When the repeater sends a packet to LoRaWAN gateway, it will use the TX channel. During TX time, RX channel will be disabled, the TX time is short but still has some influence on the capacity for end nodes.
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18	18	* Repeater software should be changed so it can send out the received packet from the End node and send out a packet that the LoRaWAN gateway can receive.
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20	20
21		-= Downlink Data Challeng =
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	24	+
	25	+= 3.  Downlink Data Challeng =
	26	+
	27	+
23	23	LoRaWAN Downlink has strict timing as below. The downlink packet must arrive end node exactly within the RX window with the correct Frequency & DR. If the downlink packet doesn't arrive within the RX window, the end node will not able to get the downlink so it fails on OTAA process and accept normal downlinks for network control.
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	30	+
25	25	[[image:image-20220514082420-2.png||height="691" width="733"]]
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35	35	** The second packet sends as usual so the nearby end node can receive it.
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38		-= Channel Challenge =
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	45	+
	46	+= 4.  Channel Challenge =
	47	+
40	40	Due to IQ invert and Channels asymmetric (Uplink and Downlink use different channels in US915, AU915 etc.) Two repeaters are required: one for Uplink and one for Downlink,
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