To improve the GTS allocation scheme in the IEEE 802.15.4 based MAC when used for a large number of medical and physical sensor devices deployed in a WiBaSe-Net
Wireless body area sensor network (WiBaSe-Net) is an emerging technology that can be used in medical, entertainment, and fitness applications.
In a WiBaSe-Net, several wearable or implanted sensor devices, for instance electro-cardiogram (ECG) sensor, blood pressure sensor, temperature sensor, respiratory sensor, pulse oximeter, and accelerometer are deployed throughout the body. A body controller unit (BCU) collects data from the sensor devices and send it to the medical center.
IEEE 802.1.54 supports not only contention based access mechanism, but also supports guaranteed time slot (GTS) scheme under beacon-enabled mode for delay-sensitive applications.
GTS transmission can avoid packet drop due to collisions in the contention-based protocol (i.e., CSMA/CA), limited number of allowable retransmission and number of backoffs. In medical sensor network, GTS allocation can also reduce the energy consumption of the sensor nodes due to carrier sensing.
To efficiently utilize the GTS, an optimization model based on the knapsack problem is formulated and solved to obtain the optimal GTS allocation for different devices
This optimization model takes the priority which is based on the packet generation rate of each device into account
- The outputs: The number of devices vs. PDR, Delay, packet discard rate, LQI, and GTS idle time.
“An Optimization-Based GTS Allocation Scheme for IEEE 802.15.4 MAC with Application to Wireless Body-Area Sensor Networks” By Bharat Shrestha, Ekram Hossain, Sergio Camorlinga, Raja Krishnamoorthy, and Dusit Niyato
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March 25, 2010