Energy-efficient medium access control protocol and system for sensor networks
First Claim
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1. A method of waking up sensor nodes in a wireless mobile ad hoc sensor network, comprising:
- a. initiating formation of a wireless mobile ad hoc sensor network by wirelessly broadcasting a single wake-up signal one time by a first sensor node with at least one parameter that increases a processing gain of the wake-up signal to make it more likely to be received by other sensor nodes which prior to reception of the wake-up signal in an isolated state unaware of other sensors nodes or the existence of a network;
b. receiving the wake-up signal from the first sensor node at at least a second sensor node, and in response thereto, the second node entering a wake-up state; and
c. in response to the second node entering the wake-up state, said second sensor node rebroadcasting the wake-up signal to wake-up other isolated sensor nodes prior to the second sensor node switching to a higher power consumption receiver to receive a synchronization message from the first sensor node.
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Abstract
An energy efficient MAC protocol for a sensor network that extends the battery life of remotely located wireless nodes by employing MAC operations involving transmission of a wake-up signal with more processing gain, dynamic adjustment of a transmission rate of synchronization messages for fast time synchronization and an energy efficient neighboring node discovery technique.
84 Citations
19 Claims
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1. A method of waking up sensor nodes in a wireless mobile ad hoc sensor network, comprising:
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a. initiating formation of a wireless mobile ad hoc sensor network by wirelessly broadcasting a single wake-up signal one time by a first sensor node with at least one parameter that increases a processing gain of the wake-up signal to make it more likely to be received by other sensor nodes which prior to reception of the wake-up signal in an isolated state unaware of other sensors nodes or the existence of a network; b. receiving the wake-up signal from the first sensor node at at least a second sensor node, and in response thereto, the second node entering a wake-up state; and c. in response to the second node entering the wake-up state, said second sensor node rebroadcasting the wake-up signal to wake-up other isolated sensor nodes prior to the second sensor node switching to a higher power consumption receiver to receive a synchronization message from the first sensor node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A moble ad hoc wireless sensor network comprising:
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a. a central node that wirelessly broadcasts a single wake-up signal one time with at least one parameter that increases the processing gain of the wake-up signal to make the single wake-up signal more likely to be detected by other sensor nodes when said central sensor node initiates formation of a moble ad hoc wireless sensor network; and b. a plurality of remote nodes that collect data and transmit the data to the central node, wherein when a remote node receives the wake-up signal from the central node it enters a wake-up state from an isolated state when it is unaware of other sensor nodes of the existence of a network and rebroadcasts the wake-up signal to wake-up other isolated sensor nodes prior to switching to a higher power consumption receiver to receive a synchronization message. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification