DocumentCode :
3283511
Title :
Cooperative Multi-Hop Wireless Sensor-Actuator Networks: Exploiting Actuator Cooperation and Cross-Layer Optimizations
Author :
Munir, Muhammad Farukh ; Papadogiannis, Agisilaos ; Filali, Fethi
Author_Institution :
Inst. Eurecom, Sophia Antipolis
fYear :
2008
fDate :
March 31 2008-April 3 2008
Firstpage :
2881
Lastpage :
2886
Abstract :
Delay and energy constraints have a significant impact on the design and operation of wireless sensor-actuator networks (SANETs). Furthermore, preventing sensor nodes from being inactive is very critical. The problem of sensor inactivity arises from the path loss and fading that degrades the quality of the signals transmitted from actuators to sensors, especially in anisotropic deployment areas, e.g., rough and hilly terrains. Sensor data transmission in SANETs heavily relies on the scheduling information that each sensor node receives from its associated actuator. Therefore if the signal containing scheduling information is received at a very low power due to the impairments introduced by the wireless channel, the sensor node might be unable to decode it and consequently it will remain inactive. In this paper, it is proposed that each sensor node transmits its data to only one of the actuators. However all actuators cooperate and jointly transmit scheduling information to sensors with the use of beamforming. This results to an important reduction in the number of inactive sensors comparing to single actuator transmission for a given level of transmit power. The reduction is due to the resulting array gain and the exploitation of macro-diversity that is provided by the actuator cooperation. In order to maximize network lifetime and attain minimum end-to-end delays, it is essential to optimally match each sensor node to a particular actuator and find an optimal routing solution. A distributed solution for optimal actuator selection subject to energy-delay constraints is also provided.
Keywords :
actuators; array signal processing; diversity reception; optimisation; scheduling; telecommunication network reliability; telecommunication network routing; wireless channels; wireless sensor networks; SANET; array signal gain; cooperative multihop wireless sensor-actuator network; cross-layer optimization; energy-delay constraint; macro diversity; minimum end-to-end delay; network lifetime maximization; optimal routing solution; sensor data transmission; sensor node scheduling information; single actuator transmission; wireless channel; Actuators; Anisotropic magnetoresistance; Array signal processing; Data communication; Decoding; Degradation; Fading; Propagation losses; Spread spectrum communication; Wireless sensor networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE
Conference_Location :
Las Vegas, NV
ISSN :
1525-3511
Print_ISBN :
978-1-4244-1997-5
Type :
conf
DOI :
10.1109/WCNC.2008.504
Filename :
4489535
Link To Document :
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