Today we talk about the design and implementation of the wake-up algorithm in wireless communication design, how to wake up the terminal at any time, the gateway and the terminal agreed to pass in some time window.
In a battery-powered wireless system, most of the time the terminal is in a sleep state, which creates a problem—what if the gateway needs to wake up the terminal at any time, what should we do? The answer is to design an excellent "wake-up delivery algorithm", that is, the gateway and terminal agreed to communicate during some time window.
Let's first look at some existing wake-up algorithms:
one. Semtech ClassA terminal wake-up algorithm
Strictly speaking, this cannot be called a "wake-up algorithm."
After the terminal actively reports, the interval is 1 second (allowing the gateway to have sufficient processing time) to open the listening window #1;
After another 1 second, open the listening window #2.
The gateway can send data to the terminal in windows #1 and #2 to complete a data communication.
two. Semtech ClassB terminal wake-up algorithm
The gateway sends a BEACON to the terminal every 128 seconds for time synchronization. The terminal opens N listening windows according to the convention at 2 BEACON intervals (ie, 128 seconds), and the gateway can communicate with the terminal in each listening window.
three. ConTIki's CX-MAC wake-up algorithm
The gateway performs N wake-up sequences as follows: Send wake-up frame - "wait for response frame - "send wake-up frame -" ......
The terminal wakes up to listen on time. If the "wake-up frame" is received, it is compared to the target address in the frame:
The address does not match, and it sleeps directly;
The address matches, sends a response frame, continues to listen and receives the data frame of the gateway.
four. Ruimi Communication's wake-up algorithmRemy's LoRa gateway and LoRa terminal support wake-up, which is more efficient and energy efficient:
1. Use CAD snooping to make LoRa terminal more energy efficient; use phase-locked synchronous wake-up technology to make LoRa communication bandwidth better.
2. Fast address matching technology is adopted to make the "non-target address" LoRa terminal sleep quickly;
3. Adopt frequency hopping technology to separate wake-up and data communication from frequency and reduce interference;
4. Support full network broadcast, LoRa gateway can quickly broadcast information to all LoRa terminals;
5. Compatible with the TDMA algorithm, the LoRa terminal can not only report automatically but also wake up at any time;
6. Embedded robust algorithm, processing: broadcast information missing, weak communication signals, real-time update configuration and other challenges.
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