1. CSE646 Mary Nitya Tharakan Person # 35085860

2.  Unlike traditional sensors like UV and infrared sensors, ZigBee sensors are in use.  RTLS supports features such as exit alerts, patient tracking, patient safety and asset tracking which are important in hospitals.  It has been introduced by a San Diego based company by the name Awarepoint.

3.  RTLS systems uses Zig Bee which offers the following features such as –  Extra Encryption Services (application and network keys implement extra 128b AES encryption).  Association and authentication (only valid nodes can join the network).  Routing protocol: AODV, a reactive ad hoc network has been implemented to perform the data routing and forwarding process to any node in the network.

4.  Three types of nodes exist in a ZigBee Network Coordinator: - the "master" device, it governs the network. Routers: -routes the information which sent by the end devices. End device (the motes - the sensor nodes) :- the ones which take the information from the environment. ZigBee creates star topology.

5.  802.15.4 is primarily used to achieve point to point and energy efficient communications.  ZigBee defines extra services (start topology routing, encryption, application services) over 802.15.4.  ZigBee creates semi-centralized networks where just the end devices can sleep.

6.  Unlike infrared sensors it offers persistent room level location tracking.  Avoids interference with medical equipment.  Maintains separation from Wi-Fi network.

7.  http://www.hoise.com/vmw/09/articles/vmw/L V-VM-07-09-8.html http://www.hoise.com/vmw/09/articles/vmw/L V-VM-07-09-8.html  http://www.rfidsb.com/rfid-street-your-weekly- inside-scoop-rfid/524-gps-sensors-mesh- networks-enhance-wireless-id-apps.html http://www.rfidsb.com/rfid-street-your-weekly- inside-scoop-rfid/524-gps-sensors-mesh- networks-enhance-wireless-id-apps.html  http://www.awarepoint.com/ http://www.awarepoint.com/  http://www.digi.com/technology/rf- articles/wireless-zigbee.jsp http://www.digi.com/technology/rf- articles/wireless-zigbee.jsp  Most slides from http://www.sensor- networks.org/index.php?page=0823123150http://www.sensor- networks.org/index.php?page=0823123150