Data forwarding method for reliable service in sensor networks
First Claim
1. A method for relaying received data by a relay node in a sensor network that includes a sink node, a source node for collecting and transmitting data requested by the sink node, and the relay node for relaying the data transmitted from the source node to the sink node, the method comprising:
- determining whether the source node that transmits the data is a previously identified source node; and
storing the data in a buffer and forwarding the data to a neighbor node when the source node transmitting the data is the previously identified source node,wherein the data stored in the buffer is retransmitted after an acknowledgement (ACK) message for the data has not been received within a time period,wherein if a Keep Alive message is not received from the neighbor node, a sensor node transmits an Update message, and the data is retransmitted to the sensor node, andwherein the Update message is transmitted by the sensor node if the sensor node intends to act as a dissemination node with the relay node.
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Accused Products
Abstract
A method for relaying received data by a relay node in a sensor network that includes a sink node, a source node for collecting and transmitting data requested by the sink node, and the relay node for relaying the data transmitted from the source node to the sink node. The relay node determines whether the source node that transmits the data is a previously identified source node, stores the data in a buffer and forwards the data to a neighbor node when the source node transmitting the data is the previously identified source node according to the determination. The data is managed based on the relay node having the buffer, rather than the source node and the sink node as in the related art. Further, the data error can be promptly handled.
26 Citations
18 Claims
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1. A method for relaying received data by a relay node in a sensor network that includes a sink node, a source node for collecting and transmitting data requested by the sink node, and the relay node for relaying the data transmitted from the source node to the sink node, the method comprising:
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determining whether the source node that transmits the data is a previously identified source node; and storing the data in a buffer and forwarding the data to a neighbor node when the source node transmitting the data is the previously identified source node, wherein the data stored in the buffer is retransmitted after an acknowledgement (ACK) message for the data has not been received within a time period, wherein if a Keep Alive message is not received from the neighbor node, a sensor node transmits an Update message, and the data is retransmitted to the sensor node, and wherein the Update message is transmitted by the sensor node if the sensor node intends to act as a dissemination node with the relay node. - View Dependent Claims (2, 3, 4)
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5. A relay node in a sensor network including a sink node, a source node for collecting and transmitting data requested by the sink node, and the relay node for relaying the data transmitted from the source node to the sink node, the relay node comprising:
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a controller which generates an instruction to store and transmit the data when a source node, which is extracted from the received data, is a previously identified source node; and a buffer which stores the received data according to the instruction, wherein the data stored in the buffer is retransmitted after an acknowledgement (ACK) message for the data has not been received within a time period, wherein if a Keep Alive message is not received from a neighbor node, a sensor node transmits an Update message, and the data is retransmitted to the sensor node, and wherein the Update message is transmitted by the sensor node if the sensor node intends to act as a dissemination node with the relay node. - View Dependent Claims (6, 7, 8, 9)
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10. A data forwarding system comprising:
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a sink node; a source node for collecting and transmitting data requested by the sink node; and a relay node for relaying the data transmitted from the source node to the sink node, wherein the relay node stores the data in a buffer and forwards the data to a neighbor node when the source node transmitting the data is a previously identified source node wherein the relay node retransmits the data stored in the buffer when an acknowledgement (ACK) message for the data is not received within a time period, wherein if a Keep Alive message is not received from the neighbor node, a sensor node transmits an Update message, and the data is retransmitted to the sensor node, and wherein the Update message is transmitted by the sensor node if the sensor node intends to act as a dissemination node with the relay node. - View Dependent Claims (11, 12)
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13. A non-transitory computer readable recording medium storing a program for relaying received data by a relay node in a sensor network that includes a sink node, a source node for collecting and transmitting data requested by the sink node, and the relay node for relaying the data transmitted from the source node to the sink node, the method comprising:
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determining whether the source node that transmits the data is a previously identified source node; and storing the data in a buffer and forwarding the data to a neighbor node when the source node transmitting the data is the previously identified source node, wherein the data stored in the buffer is retransmitted after an acknowledgement (ACK) message for the data has not been received within a time period, wherein if a Keep Alive message is not received from the neighbor node, a sensor node transmits an Update message, and the data is retransmitted to the sensor node, and wherein the Update message is transmitted by the sensor node if the sensor node intends to act as a dissemination node with the relay node. - View Dependent Claims (14, 15, 16, 17)
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18. A method for relaying data in a sensor network that includes a sink node, a source node for collecting and transmitting data requested by the sink node, and a plurality of relay nodes for relaying the data transmitted from the source node to the sink node, the method comprising:
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receiving, at a relay node, the data transmitted from the source node and storing the received data in a buffer of the relay node; transmitting, from the relay node, an acknowledgement message in response to the receiving the data, and subsequently transmitting the data from the relay node to a neighbor node if the source node is a previously identified source node; if an acknowledgement message is received from the neighbor node in response to the transmitting the data, removing the data from the buffer; and if an acknowledgement message is not received from the neighbor node in response to the transmitting the data, retransmitting the data to the neighbor node, wherein the data stored in the buffer is retransmitted after an acknowledgement (ACK) message for the data has not been received within a time period, wherein if a Keep Alive message is not received from the neighbor node, the other neighbor node transmits an Update message, and the data is retransmitted to the other neighbor node, and wherein if the other neighbor node performing functions of a second relay node intends to act as a dissemination node performing functions of a virtual relay agent, the Update message is transmitted by the other neighbor node to the relay node.
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Specification