About end_node Rx1 windows compute

1

I find an1200.23 this document have computed the LoRaWAN RX windows.

Now I find this document rx math formula different from LoRaMAC code.

image 1 :
image

image 2 :
image

I have node parameter : SF = 10 , Frequency= 925.125KHz , BW = 125KHz , RXerror = 10ms

I compute using rx math formula(image 1) :
RXwindow = 2 x Tsymb + 2 x RXerror
= 2 x 8.19 + 2 x 10
= 36.38 ms

So I compute RXwindow is 36.38 ms.

But at LoRaMAC code RXwindow is 7 ms(image 3).

image 3:
image

Why are different ? Thanks every one.

2

http://stackforce.github.io/LoRaMac-doc/_p_o_r_t_i_n_g__g_u_i_d_e.html

1 Like
3

I have a question.

Now node RX1 is 7 ms.

But document write “the receiver requires 5 symbols to detect preamble and synchronize”

Symbol = 8.19 ms

Symbol x 5 = 40.95 ms

40.95 > RX1 Window(7 ms)

Why node can detect preamble and receive data ?

image

4

preamble

5

I would check whether RxWindowTimeout is 7 milliseconds or 7 symbols.

2 Likes
6

RxWindow Timeout is 7 milliseconds