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--- exploring_lora [2021/10/20 12:51] – [4.2 [Classroom activity] Collisions and Packet Delivery Ratio] samer
+++ exploring_lora [2021/10/20 12:52] (current) – [4.2 Collisions and Packet Delivery Ratio] samer
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 Let us consider an ALOHA model for the random access in a LoRaWAN network.
+<WRAP center round help 100%>
   * What are the advantages of a random access in a wireless IoT context? What are the shortcomings?
+</WRAP>
 Suppose that the packet length is 50 bytes.
-* What is the maximum packet generation rate for each spreading factor (SF7 to SF12)? Explain your answer.
+<WRAP center round help 100%>
+  * What is the maximum packet generation rate for each spreading factor (SF7 to SF12)? Explain your answer.
+</WRAP>
 In the following we consider N devices transmitting 50 bytes packets using SF7. The packet generation rate is assumed to be equal to the maximum possible rate given the duty cycle limitation.
+<WRAP center round help 100%>
   * Compute the number of successful transmissions per hour for 50, 100, and 200 devices respectively. Comment the obtained results.
   * Plot the number of successful transmissions per hour as a function of the number of devices for SF7 and SF12. Analyse the obtained figure and attach the simulation code.
   * Plot the packet delivery ratio as a function of the number of devices for different SFs. Give the details of your computation and the simulation code.
   * Plot the number of successful transmissions per hour per device as a function of the number of generated packets per hour per device for 20 and for 100 devices. Note well the duty cycle limitation.
+</WRAP>
 ===== - Coverage Challenge =====