Optical transmission device, optical transmission method, and computer product

Abstract

An optical transmission device includes an input interface unit, a cross-connecting unit, and an output interface unit, and a bandwidth switching control unit, and switches bandwidths allocated to paths in a transmission channel that connects to an adjoining optical transmission device synchronously with the adjoining optical transmission device. When the bandwidths are not continuous in the transmission channel, the bandwidth switching control unit controls the input interface unit, the cross-connecting unit and the output interface unit to rearrange the non-continuous bandwidths into continuous ones.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic for explaining a concept of an optical transmission device according to an embodiment of the present invention;

FIG. 2 is another schematic for explaining the concept of the optical transmission device;

FIG. 3 is a detailed functional block diagram of the optical transmission device shown in FIG. 1;

FIG. 4 is an example of packet data that includes therein bandwidth adjustment data;

FIG. 5 is an example of the bandwidth adjustment data shown in FIG. 4;

FIG. 6 is a schematic for explaining a bandwidth switching process performed by the optical transmission device;

FIG. 7 is another schematic for explaining the bandwidth switching process;

FIG. 8 is yet another schematic for explaining the bandwidth switching process;

FIG. 9 is a flowchart of the bandwidth switching process performed by the optical transmission device;

FIG. 10 is a schematic for explaining a bandwidth adjustment process in an instance where there are inputs from and outputs to a plurality of optical transmission devices;

FIG. 11 is a block diagram of a computer that executes an optical transmission control program according to the present embodiment;

FIG. 12 is a schematic for explaining an optical network using GMPLS; and

FIG. 13 is a schematic for explaining separation in transmission channels in the optical network using GMPLS.

Claims

1. An optical transmission device that sets bandwidths of optical communication channels for inputting and outputting data in a time-division multiplexed optical network that uses Generalized Multi-Protocol Label Switching, the optical transmission device comprising: a switching unit that switches bandwidths used by optical communication channels in an optical transmission channel connecting to an adjoining optical transmission device;a detecting unit that detects non-continuous bandwidths in the optical transmission channel; anda bandwidth adjusting unit that controls the switching unit to rearrange detected non-continuous bandwidths into continuous bandwidths.

2. The optical transmission device according to claim 1, further comprising: a bandwidth-usage-data collecting unit that informs another optical transmission device on the optical network of bandwidth usage data including data on bandwidths used by optical communication channels, and collects bandwidth usage data informed by another optical transmission device; anda bandwidth-adjustment scheduling unit that, when in a master optical transmission device, determines a bandwidth adjustment schedule to be performed by respective optical transmission devices on the optical network based on the bandwidth usage data collected by the bandwidth-usage-data collecting unit,wherein bandwidth adjusting units of the respective optical transmission devices rearrange non-continuous bandwidths with respect to each optical transmission channel based on the bandwidth adjustment schedule determined by the bandwidth-adjustment scheduling unit.

3. The optical transmission device according to claim 1, further comprising: an input-end queue that stores data received in an input bandwidth; andan output-end queue that stores data to be transmitted in an output bandwidth,wherein the switching unit stores data in the input-end queue and transmits data stored in the output-end queue when the bandwidth is switched to another bandwidth.

4. The optical transmission device according to claim 1, wherein the switching unit transmits to the adjoining optical transmission device a control signal for controlling timing of switching the bandwidths to switch the bandwidths synchronously with the adjoining optical transmission device.

5. The optical transmission device according to claim 1, wherein the switching unit controls switching of the bandwidths based on control of the bandwidth adjusting unit and switching of the bandwidths based on operation of a network administrator mutually exclusively.

6. An optical transmission method for an optical transmission device to set bandwidths of optical communication channels for inputting and outputting data in a time-division multiplexed optical network that uses Generalized Multi-Protocol Label Switching, the optical transmission method comprising: detecting non-continuous bandwidths used by optical communication channels in an optical transmission channel; andrearranging the non-continuous bandwidths into continuous bandwidths.

7. The optical transmission method according to claim 6, further comprising: informing another optical transmission device on the optical network of bandwidth usage data including data on bandwidths used by optical communication channels, and collecting bandwidth usage data informed by another optical transmission device; anddetermining, in a master optical transmission device, a bandwidth adjustment schedule to be performed by respective optical transmission devices on the optical network based on collected bandwidth usage data,wherein the respective optical transmission devices rearrange non-continuous bandwidths with respect to each optical transmission channel based on determined bandwidth adjustment schedule.

8. A computer-readable recording medium that stores therein a computer program for controlling a computer to set bandwidths of optical communication channels for inputting and outputting data in a time-division multiplexed optical network using Generalized Multi-Protocol Label Switching, the computer program causing the computer to execute: detecting non-continuous bandwidths used by optical communication channels in an optical transmission channel; andrearranging the non-continuous bandwidths into continuous bandwidths.

9. The computer-readable recording medium according to claim 8, wherein the computer program further causing the computer to execute: informing another computer on the optical network of bandwidth usage data including data on bandwidths used by optical communication channels, and collecting bandwidth usage data informed by another computer; anddetermining, in a master computer, a bandwidth adjustment schedule to be performed by respective computers on the optical network based on collected bandwidth usage data,wherein the respective computers rearrange non-continuous bandwidths with respect to each optical transmission channel based on determined bandwidth adjustment schedule.