Minimizing power consumption in a wireless system for a sensor networks using time slots for nodes
First Claim
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1. A power efficient wireless system for a sensor network comprising:
- a) at least one access point including a processor and a transceiver configured to transmit signals to and receiving signals from a plurality of sensor nodes,b) a plurality of sensor nodes each including a processor and a transceiver configured to receive signals from the access point and transmitting data packets to the access point, andc) a communication network including wireless one hop broadcast of downlink signals from the access point to the plurality of sensor nodes, wherein the downlink signals are broadcast by the access point using a transmission power having a range covering the plurality of sensor nodes, and multi-hop transmission of at least some uplink signals that originate from the plurality of sensor nodes to the access point through a plurality of channels using time division multiple access and assigned to the sensor nodes by the access point using a scheduling mechanism, wherein the at least some uplink signals are transmitted by the plurality of sensor nodes using another transmission power having a range covering each sensors'"'"' neighboring nodes, and further wherein the transmission power used by the access point to broadcast downlink signals is higher than the transmission power used by the plurality of sensor nodes to transmit the at least some uplink signals.
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Abstract
A power efficient system architecture that exploits the characteristics of sensor networks in order to decrease the power consumption in the network. The primary characteristic of sensor networks is that the destination of all the data packets in the network is a central data collector and this central data collector, which is usually denoted as access point (AP), has unlimited transmission power and energy whereas the sensor nodes have limited battery energy and transmission power. The system uses the AP to directly synchronize and explicitly schedule the nodes'"'"' transmissions over Time Division Multiple Access (TDMA) time slots.
44 Citations
19 Claims
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1. A power efficient wireless system for a sensor network comprising:
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a) at least one access point including a processor and a transceiver configured to transmit signals to and receiving signals from a plurality of sensor nodes, b) a plurality of sensor nodes each including a processor and a transceiver configured to receive signals from the access point and transmitting data packets to the access point, and c) a communication network including wireless one hop broadcast of downlink signals from the access point to the plurality of sensor nodes, wherein the downlink signals are broadcast by the access point using a transmission power having a range covering the plurality of sensor nodes, and multi-hop transmission of at least some uplink signals that originate from the plurality of sensor nodes to the access point through a plurality of channels using time division multiple access and assigned to the sensor nodes by the access point using a scheduling mechanism, wherein the at least some uplink signals are transmitted by the plurality of sensor nodes using another transmission power having a range covering each sensors'"'"' neighboring nodes, and further wherein the transmission power used by the access point to broadcast downlink signals is higher than the transmission power used by the plurality of sensor nodes to transmit the at least some uplink signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power efficient wireless system for a sensor network comprising:
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a) a plurality of sensor nodes each including a transceiver, b) at least one access point including a transceiver for transmitting signals to and receiving signals from the plurality of sensors, c) a communication network for communication between the sensor nodes and the access point, wherein the access point determines a communication schedule for the sensor using time division multiple access uplink channels from the sensors to the access point based on neighbor and interferer information received from each sensor node, wherein the access point initially transmits a coordination packet and a tree construction packet to all of the plurality of sensor nodes, wherein the access point transmits the coordination packet to the plurality of sensor nodes in one hop using a transmission power having a range covering the plurality of sensor nodes, the sensor nodes responding using carrier sensing multiple access to communicate neighbor and interferer information to the access point, at least some sensor nodes responding via multi-hop communications originating from said at least some sensor nodes, wherein the sensor nodes transmit neighbor and interferer information using another transmission power a range covering each sensors'"'"' neighboring nodes, and further wherein the transmission power used by the access point to transmit the coordination packet is higher than the transmission power used by the sensor nodes to transmit neighbor and interferer information. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of controlling a wireless system for communicating between a plurality of sensor nodes each including a sensor, a processor, and a transceiver and an access point including a processor and a transceiver having more power than each of the sensor nodes, said method comprising:
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a) the access point transmitting in one hop to all of the plurality of sensor nodes a coordination packet and a tree construction packet, wherein the access point transmits the coordination packet using a transmission power having a range covering the plurality of sensor nodes; b) each sensor node responding to the access point using carrier sense multiple access with neighbor and interferer information, wherein at least one sensor node responds via multi-hop communication originating from said at least one sensor node, wherein the sensor nodes transmit neighbor and interferer information using another transmission power having a range covering each sensors'"'"' neighboring nodes and further wherein the transmission power used by the access point to transmit the coordination packet is higher than the transmission power used by the sensor nodes to transmit neighbor and interferer information; and c) said access point responding to received neighbor and interferer information by assigning time division multiple access channels to the sensor nodes whereby the sensor nodes have a sleep mode except during the assigned time division channel. - View Dependent Claims (14, 15)
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16. A traffic control radio communication system comprising:
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a) a plurality of nodes each including a vehicle detection sensor, b) an access point coupled to the plurality of nodes for gathering information on the node network and broadcasting periodic schedules to the nodes for listening, transmitting data using a carrier sense multiple access (CSMA) protocol, and sleeping, and c) a communication link of the plurality of nodes to the access point, including wireless one hop broadcast of downlink signals from the access point to the plurality of nodes, wherein the downlink signals are broadcast by the access point using a transmission power having a range covering the plurality of nodes; and multi-hop transmission of at least some uplink signals that originate from the plurality of nodes to the access point, wherein the at least some uplink signals are transmitted by the plurality of nodes using another transmission power having a range covering each nodes'"'"' neighboring nodes, further wherein the transmission power used by the access point to broadcast downlink signals is higher than the transmission power used by the plurality of nodes to transmit the at least some uplink signals. - View Dependent Claims (17, 18, 19)
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Specification