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exploring_lora [2018/10/06 13:51] – [3.1. Modifying the Radio Parameters] samerexploring_lora [2018/10/06 14:04] – [4.3. [Classroom activity] Collisions and Packet Delivery Ratio] samer
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 </code> </code>
  
-In order to reduce collisions, configure the central frequency of your LoRa devices as indicated below:+In order to reduce collisions between simultaneous experiments, configure the central frequency of your LoRa devices as indicated below:
  
 ^  Group Number  ^   Frequency     ^ ^  Group Number  ^   Frequency     ^
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 |       11       |      868.7      | |       11       |      868.7      |
 |       12       |      868.9      | |       12       |      868.9      |
- 
 ==== -. Running Basic Sketches ==== ==== -. Running Basic Sketches ====
  
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 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. 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.
  
-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.+Start by implementing a function on the client that measures the time necessary for sending a message. You can have recourse to 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. 
 + 
 +For example, the scenario for assessing the impact of the spreading factor on the ToA consists of sending 100 messages for three different spreading factors //e.g.,// 7, 9, and 10, and drawing the average ToA or the distribution in a boxplot for comparing the results.
  
 <WRAP center round help 100%> <WRAP center round help 100%>
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 The setting for this experiment is unique: The setting for this experiment is unique:
- 
   * 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. +  * On each client, the same average arrival rate for all groups. 
  
 <WRAP center round help 100%> <WRAP center round help 100%>
exploring_lora.txt · Last modified: 2021/10/20 12:52 by samer