A passive implicit mechanism is used to control the

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Unformatted text preview: traffics o A Transmission Control Scheme for Media Access in Sensor Networks [Woo+, 2003] Multi-hop Hidden Node problem: o It avoid the hidden node problem by constantly tuning the transmission rate and performing phase changes so that the aggregate traffic will not repeatedly collide with each other. A child can reduce a potential hidden node problem with its grand parent by not sending packets for t+ x+ packet time at the end of packet transmission t by its parent o A Transmission Control Scheme for Media Access in Sensor Networks [Woo+, 2003] Advantages: The amount of computation for this scheme is small and within networked sensor's computation capability The scheme is totally computational which is much cheaper in energy cost than on the radio The control packet overhead is reduced A Transmission Control Scheme for Media Access in Sensor Networks [Woo+, 2003] Disadvantages: The MAC protocol developed here takes into consideration the periodicity of the originating traffic which doesn't help for non periodic traffic A Transmission Control Scheme for Media Access in Sensor Networks [Woo+, 2003] Suggestions/Improvements/Future Work: An Adaptive Energy-Efficient MAC Protocol for Wireless Sensor Networks [Van dam+, 2003] T-MAC is a contention based Medium Access Control Protocol Energy consumption is reduced by introducing an active/sleep duty cycle Handles the load variations in time and location by introducing an adaptive duty cycle It reduces the amount of energy wasted on idle listening by dynamically ending the active part of it In T-MAC, nodes communicate using RTS, CTS, Data and ACK pkts which provides collision avoidance and reliable transmission When a node senses the medium idle for TA amount of time it immediately switches to sleep TA determines the minimal amount of idle listening time per frame The inc...
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