Bluetooth has a moderate bit rate
with a very high QoS and low latency. In contrast, ZigBee has a lower bit
rate with an optional low latency. However, while the maximum number of
nodes in Bluetooth Piconet is eight, the maximum number of nodes can reach
up to 264 in ZigBee network. We should remember that ZigBee technology
was developed to serve di?®erent applications than Bluetooth, which results
in significant reduction in power consumption. ZigBee applications are still in
the development phase.
105
Fig. 13. Node types in ZigBee.
Fig. 14. Two node setup to test NS2 energy model.
5 Short Note on the Energy Model in NS2 Network
Simulator
In this section we briefly mention a deficiency of the current implementation of
the Energy Model in NS2 [24] network simulator. We ran a simple simulation
106 Ali Abu-el Humos et al.
A B
Chapter 4 Medium Access Control Protocols for Wireless Sensor Networks
Event Event No. times Total event Event power Total event
duration (s) event occurred
time (s) (W) energy (J)
SYNCPktTX 0.0102 4 0.0408 2 0.0816
SYNCPktRX 0.0102 3 0.0306 1 0.0306
RTSPktTX 0.011 1 0.011 2 0.022
RTSPktRX 0.011 1 0.011 1 0.011
CTSPktTX 0.011 1 0.011 2 0.022
CTSPktRX 0.011 1 0.011 1 0.011
DATAPktTX 0.043 2 0.086 2 0.172
DATAPktRX 0.043 1 0.043 1 0.043
ACKPktTX 0.011 1 0.011 2 0.022
ACKPktRX 0.011 1 0.011 1 0.011
Sleep 0.1432 9 0 0 0
Idle NA NA 9.733599 1 9.733599
TOTAL 9.999999 10.159799
Table 1.
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