Wireless network system

• US 9,220,127 B2
• Filed: 04/15/2013
• Issued: 12/22/2015
• Est. Priority Date: 04/16/2012
• Status: Active Grant

• Current Assignee: Yokogawa Electric Corporation
• Original Assignee: Yokogawa Electric Corporation
• Inventors: Takahashi, Hiromi
• Primary Examiner(s): Choi, Eunsook
• Application Number:
  US13/862,860
• Publication Number:
  US 20130272200A1
• Time in Patent Office: 981 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 84/00 Network topologies

Abstract

A wireless network system includes a plurality of devices operating on the basis of incompatible and different standards. At least one of the devices comprises a standard identifying module configured to identify standards on the basis of parameters inherent and different in the respective standards.

Claims

1. A wireless network system comprising:

a plurality of devices operating on the basis of incompatible and different standards,

wherein at least one of the devices comprises;

a standard identifier detector configured to detect an identifier by reading a value from a structure of data received by the at least one device,

a standard judgment module configured to judge a version of the standard on the basis of the identifier detected by the standard identifier detector,

a manipulation detection code calculator configured to calculate a manipulation detection code (MIC) for the version of the standard, and

a manipulation detection code comparator configured to compare a manipulation detection code (MIC) detected by a manipulation detection code detector and the manipulation detection code calculated by the manipulation detection code calculator, thereby judging whether the two are coincident with each other,

wherein, in the case that the standard judgment module judges that the version is old, if the manipulation detection code comparator judges that the two are coincident with each other, an old version manipulation detection code, calculated based on an algorism of the old version including a cipher key common to a transmitting side by the manipulation detection code calculator, is added to an acknowledge signal and then transmitted, and

if the manipulation detection code comparator judges that the two are not coincident with each other, the old version manipulation detection code, calculated based on the algorism of the old version including the cipher key common to the transmitting side by the manipulation detection code calculator, is added to a non-acknowledge signal and then transmitted, and

wherein, in the case that the standard judgment module judges that the version is new, if the manipulation detection code comparator judges that the two are coincident with each other, a new version manipulation detection code, calculated based on an algorism of the new version including a cipher key common to the transmitting side by the manipulation detection code calculator, is added to an acknowledge signal and then transmitted, and

if the manipulation detection code comparator judges that the two are not coincident with each other, the new version manipulation detection code, calculated based on the algorism of the new version including the cipher key common to the transmitting side by the manipulation detection code calculator, is added to a non-acknowledge signal and then transmitted.

2. The wireless network system according to claim 1, wherein the incompatible and different standards correspond to the old version and the new version of the industrial automation wireless communication standard ISA100.11a.

3. The wireless network system according to claim 1, wherein the incompatible and different standards correspond to the old version and the new version of the industrial automation wireless communication standard ISA100.11a.

4. The wireless network system according to claim 1,

wherein the manipulation detection code calculator is configured to calculate the manipulation detection code on the basis of an algorithm of the identified standard.

5. The wireless network system according to claim 1, wherein the value from the structure of the data is in a frame of datalink layer header (DHR).

6. The wireless network system according to claim 1, wherein the value from the structure of the data is in a frame of datalink layer header subheader (DHDR).

7. The wireless network system according to claim 1, wherein the value from the structure of the data is in a frame comprising identifying a datalink layer (DL) Version.