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Nt1310 Unit 3 Network Analysis

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SmartWake focuses on low power communication and reduces the need for longer transceiver activity. A duty cycle is not required to switch between an active and sleep cycles. The integration of the wake-up unit in sensor nodes makes it possible for the nodes to stay in a deep sleep mode until a wake-up signal is received. The detection of the signal occurs on a passive level without the wireless transceiver being active. Data packet transmission takes place when the transceiver is activated.

A. Data Packets
Data packets are transmitted during the active period of the transceiver. The packet structure can be seen in Fig. 6. The transmission buffer (Txbuffer) can handle up to 64 bytes. However, to avoid any possible collisions during packet transmission …show more content…
The packet header contains the destination, next-hop and the source address. Each address has a higher and a lower byte. In case of a broadcast packet in a multi-hop network, a broadcast address (0xFFFF) is used for the destination and next-hop. A packet type is a command specific that defines the type of operation in the network. In SmartWake, several packet types are considered to provide a consistent functionality of the network:
Request Packet (REQ): the gateway initiates the REQ packet in order to check the status of the whole system. The REQ packet is forwarded from one node to another.
Status Packet (STAT): a STAT packet contains information about the window’s status. It is transmitted when a REQ packet is received or a STAT packet is directly transmitted without receiving a REQ packet when the window status is changed (window is opened after it was closed or vice versa).
Discovery Packet (DISCVR): a DISCVR beacon is used to initialize the network by creating wake-up tables at each node, so that sensor nodes can sends a wake-up signal to a specific node. In general, the network is static and is uncommon that new nodes join the

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