Wireless Body Area Networks

A number of middle-aged and
elderly people with chronic diseases are increasing. In addition,
patients with chronic diseases do not cause health harm in a
short period and need long-term hospitalization. Thus, wireless
body area network (WBAN) is the best scheme for daily care.
According to the human physiological information, it not only
sends real-time notifications to users but also reduces delays of the
notification regarding patients’ conditions. The physician early
identifies the cause of disease and applies remedies according to
indications. Daily activities of a person affect the transmission
signal of sensor nodes such as walk or run. Thus, the sensor
nodes which have to retransmit the failed frames are continuously
interfered a period time by human body shadowing, so the
retransmission procedure should be deferred. If the sensor nodes
immediately retransmit the failed frames, they may suffer from
the human posture interference again.

In WBSNs, transmission signal strength may attenuate
during transmission depending on different reasons such as
transmission distance, transmission power, and an obstacle in
between sender and receiver. In addition, sensor nodes transmit
data using lower power for saving energy. Because the sensor
node is installed in/on the human body, the organs or limbs
may affect signal strength . When transmission signal is
shadowed, higher frame error rate (FER) may cause by weak
signal strength. As a result, sensor nodes need to retransmit
the failed frame and increase transmission cost.

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