Communication device and logical link abnormality detection method

• US 7,965,625 B2
• Filed: 06/30/2005
• Issued: 06/21/2011
• Est. Priority Date: 03/29/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Itoh, Jun, Yasuoka, Hirotomo
• Primary Examiner(s): Harper; Kevin C
• Assistant Examiner(s): CHAN, SAI MING
• Application Number:
  US11/171,629
• Publication Number:
  US 20060221840A1
• Time in Patent Office: 2,182 Days
• Field of Search: 370/242, 370218-228, 370/536
• US Class Current: 370/218
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• CPC Class Codes: H04L 69/326 in the transport layer [OSI layer 4] H04L69/16 takes precedence
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

The present invention provides a communication device capable of providing a highly reliable service by detecting communication abnormality at a high speed. The communication device comprises a link configuring unit configuring a plurality of logical links between a opposite communication device, a segmenting unit segmenting transmission data as being associated with each of the plurality of logical links, a transmission unit transmitting the segmented data via the logical link associated with this segmented data, a receiving unit receiving the data via each of the plurality of logical links, and an abnormality detection unit judging, within a predetermined period of time since the data were received via any one of the plurality of logical links, if the data are not received via at least one of the remaining logical links, at least one logical link to be an abnormal logical link.

Claims

1. A communication device comprising:

a link configuring unit to configure a plurality of logical links between the communication device and an opposite communication device;

a receiving unit to receive data associated with each of the plurality of logical links; and

an abnormality detection unit to judge, with respect to each of the plurality of logical links, whether at least one of the plurality of logical links is abnormal by judging if at least one of a plurality of data concurrently-transmitted on the plurality of logical links from the opposite communication device is not received by the receiving unit via the at least one of the plurality of logical links within a predetermined time period following receipt of any other one of the plurality of data on any other one of the plurality of logical links;

a segmenting unit to segment transmission data, the segmented transmission data being associated with at least one of the plurality of logical links;

a transmission unit to transmit the segmented transmission data via the at least one of the plurality of logical links associated with the segmented transmission data; and

a storage unit to store information about the logical link judged to be the abnormal logical link by the abnormality detection unit,

wherein, if the storage unit contains information about the abnormal logical link when requested to transmit the transmission data, the segmenting unit stops segmenting the transmission data, and the transmission unit transmits the un-segmented transmission data via any of the plurality of logical links other than the abnormal logical link.

2. The communication device according to claim 1, wherein

the segmenting unit assigns a transmission number to the segmented transmission data, and

the transmission unit transmits the segmented transmission data together with the transmission number assigned to this segmented transmission data.

3. The communication device according to claim 1, further comprising:

a synthesizing unit to synthesize the data received by the receiving unit via each of the plurality of logical links, corresponding to transmission numbers received together with the data.

4. A logical link abnormality detection method executed by a communication device transferring and receiving data to and from an opposite communication device via a plurality of logical links, comprising:

receiving data via the plurality of logical links; and

judging, with respect to each of the plurality of logical links, at least one of the plurality of logical links is abnormal by judging if at least one of a plurality of data concurrently-transmitted on the plurality of logical links from the opposite communication device is not received by the communication device itself via the at least one of the plurality of logical links within a predetermined time period following receipt of any other one of the plurality of data

on any other one of the plurality of logical links;

segmenting transmission data by a segmenting unit, the segmented transmission data being associated with at least one of the plurality of logical links;

transmitting the segmented transmission data by a transmitting unit via the at least one of the plurality of logical links associated with the segmented transmission data; and

storing information about the logical link judged to be the abnormal logical link by the abnormality detection unit in a storage unit,

wherein, if the storage unit contains information about the abnormal logical link when requested to transmit the transmission data, the segmenting unit stops segmenting the transmission data, and the transmitting unit transmits the un-segmented transmission data via any of the plurality of logical links other than the abnormal logical link.

5. An SCTP communication device transferring and receiving data to and from an opposite communication device by use of SCTP (Stream Control Transmission Protocol), comprising:

a link configuring unit to configure a plurality of logical links between said SCTP communication device and the opposite communication device;

a receiving unit to receive data via the plurality of logical links; and

an abnormality detection unit to judge, with respect to each of the plurality of logical links, at least one of the plurality of logical links is abnormal by judging if at least one of a plurality of data concurrently-transmitted on the plurality of logical links from the opposite communication device is not received by the receiving unit via the at least one of the plurality of logical links within a predetermined time period following receipt of any other one of the plurality of data on any other one of the plurality of logical links

a segmenting unit to segment transmission data, the segmented transmission data being associated with at least one of the plurality of logical links;

a transmission unit to transmit the segmented transmission data via the at least one of the plurality of logical links associated with the segmented transmission data; and

a storage unit to store information about the logical link judged to be the abnormal logical link by the abnormality detection unit,

wherein, if the storage unit contains information about the abnormal logical link when requested to transmit the transmission data, the segmenting unit stops segmenting the transmission data, and the transmission unit transmits the un-segmented transmission data via any of the plurality of logical links other than the abnormal logical link.