Wifi has the advantages of high data rate and long range
transmit distances, but it requires a great power that is equal to
400mA on standby operation. While ZigBee has the
advantages that it uses less power that is equal to 30mA during
standby mode, but zigbee only supports low data rate and
short range transmit distances. With respective advantages and
disadvantages are owned by these both standard
communication, the researchers tried to combine the ZigBee
communication standard with wifi communication standards
in a telemonitoring system based on wireless networks.
ZigBee data packet structure can be seen in Figure l.