wikiroute

networking recipes

User Tools

Site Tools

Trace:
exploring_lora

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Next revisionBoth sides next revision
exploring_lora [2018/09/29 15:44] – samerexploring_lora [2018/09/29 23:26] – [4.3. [Classroom activity] Collisions and Packet Delivery Ratio] samer
Line 121: Line 121:
 ==== -. Time on Air ==== ==== -. Time on Air ====
  
-In this section, you will measure the Time on Air (ToA) as given by the time necessary to transmit a message on the radio interface. You will assess the impact of the spreading factor, bandwidth, coding rate, and the message size on the ToA.+In this section, you will measure the Time on Air (ToA) that is given by the time necessary to transmit a message on the radio interface . You will assess the impact of the spreading factor, bandwidth, coding rate, and message size on the ToA.
  
-For this, you will start by implementing a function on the client that measures the time necessary for sending a message. For example, you can use the [[https://www.arduino.cc/en/Reference/Micros| micros()]] function available in the arduino libraries. Now, you can modify one of the parameters (spreading factor, bandwidth, coding rate, message size) and record the impact on the ToA. Note well that you may need to repeat the expriment to obtain the statistical distributions.+Start by implementing a function on the client that measures the time necessary for sending a message. For example, you can use the [[https://www.arduino.cc/en/Reference/Micros| micros()]] function available in the arduino libraries. Now, you can modify one of the parameters (spreading factor, bandwidth, coding rate, message size) and record the impact on the ToA. Note well that you may need to repeat the experiment multiple times in order to obtain the statistical distribution.
  
 <WRAP center round help 100%> <WRAP center round help 100%>
Line 131: Line 131:
   * Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the experimental ones on the same graph.   * Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the experimental ones on the same graph.
 </WRAP> </WRAP>
- 
 ==== -. Coverage ==== ==== -. Coverage ====
  
-In this section, you will measure the coverage of LoRa under the three different radio configurations. Such configurations should ensure different reliability levels. +In this section, you will measure the coverage of LoRa under different radio configurations.
  
-For this, you will start by identifying a set of geographical locations or Test Points (TP). These TPs should be astutely chosen to challenge the limits of LoRa transmission. Then you should implement a function on the server that measures the ratio of successfully delivered packets or PDR.+Start by identifying a set of five geographical locations or Test Points (TP). These TPs should be astutely chosen to explore the limits of LoRa coverage. Then, you should implement a function on the server that measures the ratio of successfully delivered packets or PDR. Now, you should run the experiment for three different radio configurations: such configurations should ensure different reliability levels (high, medium, and low reliability). 
  
 <WRAP center round help 100%> <WRAP center round help 100%>
   * Draw the test points on a map and motivate your choices.   * Draw the test points on a map and motivate your choices.
 +  * Describe the radio configurations you selected and their impact on the reliability of the transmission.  
   * Visualise the experimental results by plotting the PDR for each TP and each radio configuration.    * Visualise the experimental results by plotting the PDR for each TP and each radio configuration. 
   * Analyze the obtained results.   * Analyze the obtained results.
 </WRAP> </WRAP>
- 
 ==== -. [Classroom activity] Collisions and Packet Delivery Ratio ==== ==== -. [Classroom activity] Collisions and Packet Delivery Ratio ====
  
-In this section, you will measure the impact of collisions on the network throughput under different transmission periods.+In this section, you will measure the impact of the packet arrival rate on the collision rate and consequently the PDR.
  
 The setting for this experiment is unique: The setting for this experiment is unique:
Line 152: Line 151:
   * Only one server is required in the classroom. This server should compute the ratio of successfully delivered packets or PDR.   * Only one server is required in the classroom. This server should compute the ratio of successfully delivered packets or PDR.
   * All groups are required to use the same frequency, spreading factor, and coding rate.   * All groups are required to use the same frequency, spreading factor, and coding rate.
 +  * On each client, packets will be generated following a Poisson process with the same average arrival rate for all groups. 
  
 <WRAP center round help 100%> <WRAP center round help 100%>
-  * Draw the PER as a function of the transmission period. Analyze your results.  +  * Draw the PDR as a function of the average arrival rate. Analyze your results.  
-  * What type of mathematical models enables to theoretically compute the PER?+  * What type of mathematical model enables to theoretically compute the PDR? Verify the obtained results.
 </WRAP> </WRAP>
- 
 ===== -. Coverage Challenge ===== ===== -. Coverage Challenge =====
  
exploring_lora.txt · Last modified: 2021/10/20 12:52 by samer