L12

Question 1

LPWAN, Wifi, Bluetooth

Which has the highest range? Which has the highest data rate?

Answer 1

Highest to lowest range: LPWAN -> Wifi -> Bluetooth

Highest to lowest data rate: Wifi -> Bluetooth -> LPWAN

Question 2

What are examples of LPWAN? and why would they be chosen?

Answer 2

Narrowband IoT for scalability and QoS

Sigfox and Lora for range, coverage, deployment and cost effieciency

Question 3

What are LPWANs?

Answer 3

Low Power, Wide-Area Networks (LPWAN) offer multi-year battery lifetime and are designed for sensors and applications that need to send small amounts of data over long distance

Question 4

Explain an LPWAN example along with its architecture. (Lora)

Answer 4

LoRaWAN: an energy efficient LPWAN technology designed to address power consumption and coverage

LoRaWAN architecture: operates in a star topology with end-devices communicating data to gateways who transmit it to a central network server via an IP connection

Question 5

How does LoRaWAN achieve low power consumption and long range communications?

Answer 5

via chirp spread spectrum modulation, which is a technique used to modulate the signal using chip pulses

Question 6

How does the spreading factor affect LoRa?

Answer 6

The higher the spreading factor, the larger the communication range