NETWORK SYSTEM AND DATA TRANSFER METHOD

• US 20080151759A1
• Filed: 10/18/2007
• Published: 06/26/2008
• Est. Priority Date: 12/25/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: YAMADA, Kenji
• Granted Patent: US 8,331,239 B2
• Time in Patent Office: Days
• US Class Current: 370/238
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/124 using a combination of metrics
• CPC Class Codes: H04W 40/04 based on wireless node resources
• CPC Class Codes: H04W 40/10 based on available power or energy
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Upon communication nodes receiving data that is a transfer target, based on a link value corresponding to a communication quality of each communication node that has transferred the data and radio wave strength among the communication nodes, a network system calculates a total link value that indicates a quality of a communication path that is used to transfer the data. The network system determines whether the calculated total link value is greater than or equal to a threshold value and based on a determination result, transfers the data to a destination communication node.

Claims

1. A network system that includes a plurality of nodes that include a wireless communication function and that carries out data communication via the nodes, comprising:

a total link value-calculating unit that calculates, upon receiving data that is a transfer target, based on link values corresponding to a communication quality of the nodes that have transferred the data and radio wave strength among the nodes, a total link value that indicates a quality of a communication path that is used to transfer the data; and

a transferring processor that transfers, based on the total link value that is calculated by the total link value-calculating unit, the data to a destination node.

2. The network system according to claim 1, wherein the link values are calculated based on a remaining battery charge of the nodes, a processing load on the nodes, a processing capacity of the nodes, a role of the nodes, or the radio wave strength among the nodes that have transferred the data.

3. The network system according to claim 1, wherein the transferring processor compares, a threshold value set by a source node of the data that is the transfer target and the total link value, determines whether the total link value is greater than or equal to the threshold value, and based on a determination result, transfers the data to an adjacent node.

4. A data transfer method of a network system that includes a plurality of nodes that include a wireless communication function and that carries out data communication via the nodes, the data transfer method comprising:

total link value-calculating including

storing in a storage device, upon receiving data that is a transfer target, link values corresponding to a communication quality of the nodes that have transferred the data and radio wave strength among the nodes, and

calculating, based on the stored link values and the radio wave strength, a total link value that indicates a quality of a communication path that is used to transfer the data; and

transferring, based on the total link value that is calculated at the total link value-calculating, the data to a destination node.

5. The data transfer method according to claim 4, wherein the link values are calculated based on a remaining battery charge of the nodes, a processing load on the nodes, a processing capacity of the nodes, a role of the nodes, or the radio wave strength among the nodes that have transferred the data.

6. The data transfer method according to claim 4, wherein the transferring includes:

comparing, a threshold value set by a source node of the data that is the transfer target and the total link value;

determining whether the total link value is greater than or equal to the threshold value; and

transferring the data to an adjacent node based on a determination result.

7. A computer-readable recording medium that stores therein a computer program for a network system that includes a plurality of nodes that include a wireless communication function and that carries out data communication via the nodes, the computer program causing a computer to execute:

total link value-calculating including

storing in a storage device, upon receiving data that is a transfer target, link values corresponding to a communication quality of the nodes that have transferred the data and radio wave strength among the nodes, and

calculating, based on the stored link values and the radio wave strength, a total link value that indicates a quality of a communication path that is used to transfer the data; and

transferring, based on the total link value that is calculated at the total link value-calculating, the data to a destination node.

8. The computer-readable recording medium according to claim 7, wherein the link values are calculated based on a remaining battery charge of the nodes, a processing load on the nodes, a processing capacity of the nodes, a role of the nodes, or the radio wave strength among the nodes that have transferred the data.

9. The computer-readable recording medium according to claim 7, wherein the transferring includes:

comparing, a threshold value set by a source node of the data that is the transfer target and the total link value;

determining whether the total link value is greater than or equal to the threshold value; and

transferring the data to an adjacent node based on a determination result.

10. A communicator that receives data from another communicator and transfers the data, comprising:

a total link value-calculating unit that calculates, upon receiving the data that is a transfer target, based on link values corresponding to a communication quality of communicators that have transferred the data and radio wave strength among nodes, a total link value that indicates a quality of a communication path that is used to transfer the data; and

a transferring unit that transfers the data based on the total link value that is calculated by the total link value-calculating unit.