Energy - Energy Efficiency Part 9 CS-6777 Mobile Ad Hoc...

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Energy Efficiency Part 9 CS-6777 Mobile Ad Hoc Networking Memorial University of Newfoundland
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Energy Efficiency in MANETs Mobile devices have limited energy sources Difference from cellular networks n Infrastructureless n Peer to peer Channel reuse Possible venues that may contribute to energy conservation n Your inputs …
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Where are the Joules? Network interface consumes a significant fraction of energy n Other aspects: CPU/circuitry, display Operation modes of network interfaces n Transmitting n Receiving n Idling n Sleep (off)
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Measuring Energy Consumption Some power consumption measurements of select IEEE 802.11 interfaces (2.4GHz) 2 0.13 0.83 1.0 1.4 Cabletron Roamabout 11 0.048 0.74 0.90 1.3 Lucent Silver 3.10 1.3 1.4~1.9 Transmit (W) - - 1.5 1.52 Lucent WaveLAN 2 0.066 0.84 0.97 Lucent Bronze 11 0.075 1.34 1.3~1.4 Aironet PC4800 Data rate (Mbps) Sleep (W) Idle (W) Receive (W) Interface
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Unicast Transmission Lucent WaveLAN at 2Mbps 256B MAC payload (228:data, 8:UDP, 20:IP)
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Power-Save Find a way to put the interface in the sleep mode as much as possible; while Not compromising network performance much
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802.11’s Power Management Allows idle STAs to go to sleep n STA’s power save mode stored in AP AP buffers packets for sleeping STAs n AP announces which STA have frames buffered n Traffic Indication Map (TIM) sent with every beacon Power saving STAs wake up periodically n Listen for the TIM contained in beacons TSF assures AP and power save STAs in synch n STAs will wake up to hear a beacon n TSF timer keeps running when STAs sleeping n Synchronization allows extreme low power consumption
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802.11’s Power Management When a STA finds itself indicated in the TIM, it issues a PS-Poll frame can stay active before the AP sends the frame Broadcast/multicast messages are indicated in Delivery TIM’s (DTIM’s) that are sent by AP every multiple of TIM intervals
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