What is Radio Communication?

 What is Radio Communication?

Radio Communication
Radio Communication

In a ZigBee network, radio transmission/reception is handled by IEEE 802.15.4 (the lowest level in the software stack).

ZigBee was designed to operate in unlicensed radio frequency (RF) bands. The unlicensed RF bands are not the same in all territories of the world, but IEEE 802.15.4 employs three possible bands, at least one of which should be available in a given territory. The three bands are centered on the following frequencies: 868, 915, and 2400 MHz.

The 868-MHz and 915-MHz frequency bands offer certain advantages such as fewer users, less interference, less absorption, and reflection.

However, the 2400-MHz band is far more widely adopted for a number of reasons, including:

  1. Worldwide availability for unlicensed use.
  2.  Higher data rate (250 kbps) and more channels.
  3. Lower power (transmit/receive are on for a shorter time due to higher data rate).
  4. Channel Selection.
  5. Energy detection functionality is included that can be used by higher software layers to avoid interference between radio communications
The best frequency channel can be selected at initialization.

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