Wireless sensor network with linear structure being capable of bidirectional communication and method thereof
First Claim
1. A wireless sensor network comprising a plurality of nodes linearly connected from a sink node to a terminal node by connecting each node to a single upper-level node and a single lower-level node,wherein each node has an active period for transmitting/receiving data to/from its upper-level node and lower-level node, andwherein the active period includes a downstream duration for transmitting data/commands from the sink node to the terminal node and an upstream duration for transmitting data/commands from the terminal node to the sink node, and an intermission duration between the downstream duration and the upstream duration,wherein no data is transmitted/received to/from its upper-level node during the intermission duration,wherein the intermission duration of each node is determined based on a depth of the node and the number of hops included in the entire network,wherein each of the downstream duration and the upstream duration includes a receive (RX) interval, a transmit (TX) interval, and an acknowledgement (ACK) interval, andwherein all the nodes linearly connected from the sink node to the terminal node perform bidirectional communication within a single active period.
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Abstract
Disclosed is a wireless sensor network with a linear structure capable of bidirectional communication. The wireless sensor network includes a plurality of nodes linearly connected from a sink node to a terminal node by connecting each node to a single upper-level node and a single lower-level node, each node has an active period for transmitting/receiving data to/from its upper-level node and lower-level node, the active period includes a downstream duration for transmitting data/commands from the sink node to the terminal node and an upstream duration for transmitting data/commands from the terminal node to the sink node, and each of the upstream and downstream durations sequentially includes RX, TX, and ACK intervals, so that bidirectional communication between the sink node and the terminal node can be performed within a single active period.
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Citations
9 Claims
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1. A wireless sensor network comprising a plurality of nodes linearly connected from a sink node to a terminal node by connecting each node to a single upper-level node and a single lower-level node,
wherein each node has an active period for transmitting/receiving data to/from its upper-level node and lower-level node, and wherein the active period includes a downstream duration for transmitting data/commands from the sink node to the terminal node and an upstream duration for transmitting data/commands from the terminal node to the sink node, and an intermission duration between the downstream duration and the upstream duration, wherein no data is transmitted/received to/from its upper-level node during the intermission duration, wherein the intermission duration of each node is determined based on a depth of the node and the number of hops included in the entire network, wherein each of the downstream duration and the upstream duration includes a receive (RX) interval, a transmit (TX) interval, and an acknowledgement (ACK) interval, and wherein all the nodes linearly connected from the sink node to the terminal node perform bidirectional communication within a single active period.
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4. A wireless sensor network comprising a plurality of nodes linearly connected from a sink node to a terminal node by connecting each node to a single upper-level node and a single lower-level node,
wherein an active period and an inactive period each of which has a predetermined time length are repeated in each node; -
wherein the active period sequentially includes a downstream duration for transmitting data/commands from the sink node to the terminal node, an intermission duration, and an upstream duration for transmitting data/commands from the terminal node to the sink node; and wherein each of the downstream duration and the upstream duration includes a receive (RX) interval, a transmit (TX) interval, and an acknowledgement (ACK) interval, wherein the intermission duration of each node is determined based on the number of hops included in the entire network and its depth; and wherein all the nodes linearly connected from the sink node to the terminal node perform bidirectional communication within a single active period.
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5. A wireless sensor network comprising a plurality of nodes linearly connected from a sink node to a terminal node by connecting each node to a single upper-level node and a single lower-level node,
wherein an active period and an inactive period each of which has a predetermined time length are sequentially repeated in each node; -
wherein the active period sequentially includes an upstream duration for transmitting data/commands from the terminal node to the sink node, an intermission duration, and a downstream duration for transmitting data/commands from the sink node to the terminal node; and wherein each of the downstream duration and the upstream duration includes a receive (RX) interval, a transmit (TX) interval, and an acknowledgement (ACK) interval, wherein the intermission duration of each node is determined based on the number of hops included in the entire network and its depth; and wherein all the nodes linearly connected from the sink node to the terminal node perform bidirectional communication within a single active period.
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6. A method of transmitting/receiving bidirectional data in a wireless sensor network having a plurality of nodes connected in a linear manner from a sink node to a terminal node, wherein an active period of each node includes a downstream duration for transmitting data/commands from the sink node to the terminal node, and an upstream duration for transmitting data/commands from the terminal node to the sink node, and an intermission duration between the downstream duration and the upstream duration, the method comprising:
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(a1) each node receiving data/commands from its upper-level node and transmitting the data/commands to its lower-level node during the downstream duration; and (a2) each node receiving data/commands from its lower-level node and transmitting the data/commands to its parent node during the upstream duration, and (a3) each node determining its intermission duration based on the number of hops included in the entire network and its depth, and interposing the intermission duration between the downstream duration and the uplink duration, wherein all the nodes linearly connected from the sink node to the terminal node perform bidirectional communication within a single active period. - View Dependent Claims (7, 8, 9)
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Specification