Energy-Efficient Channel Access Protocols. Venkatesh Rajendran [email protected] Introduction. Sensor networks are a special class of multihop wireless networks. Ad-hoc deployment. Self-configuring. Unattended. Battery powered. Sink. Sink. Network Architecture. Thousands of nodes.
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No coordination (ALOHA)
Collision at B
Listen before transmitting
Stations sense the channel before transmittingdata packets.
Hidden Terminal Problem
Collision at R
Backoff due to CTS
Scheduled-based(time-slotted) MAC Protocols
NCR - Example
NCR does not elect receivers and hence, no support for radio-mode control.
TRAMA Components Mobicom00]
Simulation Results Mobicom00]
Synthetic broadcast traffic using Poisson arrivals.
50 nodes, 500x500 area.
512 byte data.
Average node density: 6
Energy Savings Mobicom00]
Percentage Sleep Time
Average Length of sleep interval
TRAMA Limitations Mobicom00]
Flow-aware, energy-efficient framework.
TRAMA Summary Mobicom00]
Sink initiates neighbor discovery, flow discovery and time synchronization.
Broadcasts periodic SYNC packets.
Potential children reply with SYNC_REQ.
Source reinforces with another SYNC packet.
Once associated with a parent, nodes start sending periodic SYNC broadcasts.
FLAMA Summary grid topology, edge sink)