Method for transmitting impairment information, node, and network system

• US 8,724,986 B2
• Filed: 12/05/2011
• Issued: 05/13/2014
• Est. Priority Date: 06/05/2009
• Status: Active Grant

• Current Assignee: Apex Net LLC (IP Edge LLC)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Han, Jianrui
• Primary Examiner(s): Leung, Danny
• Application Number:
  US13/311,084
• Publication Number:
  US 20120076490A1
• Time in Patent Office: 890 Days
• Field of Search: 398/17
• US Class Current: 398/17
• CPC Class Codes: H04J 14/0257 Wavelength assignment algorithms
• CPC Class Codes: H04J 14/0267 Optical signaling or routing
• CPC Class Codes: H04J 14/0268 Restoration of optical paths, e.g. p-cycles
• CPC Class Codes: H04J 14/0269 using tables for routing
• CPC Class Codes: H04J 14/0271 Impairment aware routing
• CPC Class Codes: H04J 14/0284 WDM mesh architectures
• CPC Class Codes: H04J 14/0287 Protection in WDM systems

Abstract

The embodiments of the present invention relate to the field of communication technologies, and disclose a method for transmitting impairment information, a node, and a network system. The method for transmitting impairment information includes: receiving, by a first node on a path, first impairment information from a previous hop node, and updating the first impairment information to obtain physical impairment parameters of all or a part of available wavelengths at the first node; deleting a wavelength whose physical impairment parameter at the first node exceeds a preset range; and sending second impairment information to a next hop node of the first node when a residual wavelength still exists after the wavelength whose impairment parameter exceeds the preset range is deleted. The second impairment information includes a physical impairment parameter of the residual wavelength at the first node.

Claims

1. A method for transmitting impairment information, comprising:

receiving, by a first node on a path, first impairment information from a previous hop node of the first node, wherein the first impairment information comprises a physical impairment parameter of one or more available wavelengths at the previous hop node;

updating, by the first node, the first impairment information, wherein physical impairment parameters of all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are updated to physical impairment parameters of the all or a part of available wavelengths at the first node, wherein the physical impairment parameters of the all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are comprised in the first impairment information;

judging, by the first node, whether the physical impairment parameters of the all or a part of available wavelengths at the first node exceed a preset range;

when the all or a part of available wavelengths comprise a wavelength whose physical impairment parameter at the first node exceeds the preset range, deleting the wavelength whose physical impairment parameter at the first node exceeds the preset range; and

when the all or a part of available wavelengths still comprise a residual wavelength after the wavelength whose physical impairment parameter at the first node exceeds the preset range is deleted, sending, by the first node, second impairment information to a next hop node of the first node, wherein the second impairment information comprises a physical impairment parameter of the residual wavelength at the first node.

2. The method according to claim 1, wherein the updating, by the first node, the physical impairment parameters of the all or a part of available wavelengths of the one or more available wavelengths at the previous hop node to the physical impairment parameters of the all or a part of available wavelengths at the first node comprises:

updating, by the first node, the physical impairment parameter of the one or more available wavelengths at the previous hop node to an intermediate physical impairment parameter of the one or more available wavelengths according to a physical impairment value between the previous hop node and the first node; and

updating, by the first node, the intermediate physical impairment parameter of the one or more available wavelengths to the physical impairment parameter of the one or more available wavelengths at the first node according to a physical impairment value of the first node.

3. The method according to claim 1, wherein the updating, by the first node, the physical impairment parameters of the all or a part of available wavelengths of the one or more available wavelengths at the previous hop node to the physical impairment parameters of the all or a part of available wavelengths at the first node comprises:

updating, by the first node, the physical impairment parameter of the one or more available wavelengths at the previous hop node to an intermediate physical impairment parameter of the one or more available wavelengths according to a physical impairment value between the previous hop node and the first node;

judging, by the first node, whether the intermediate physical impairment parameter of the one or more available wavelengths exceed the preset range;

when the one or more available wavelengths comprise a wavelength whose intermediate physical impairment parameter exceeds the preset range, deleting the wavelength whose intermediate physical impairment parameter exceeds the preset range to obtain a wavelength whose intermediate physical impairment parameter falls within the preset range; and

updating an intermediate physical impairment parameter of the wavelength whose intermediate physical impairment parameter falls within the preset range to a physical impairment parameter of the wavelength at the first node according to a physical impairment value of the first node, wherein the intermediate physical impairment parameter of the wavelength falls within the preset range.

4. The method according to claim 1, wherein

the previous hop node of the first node is a source node of the path, and the one or more available wavelengths are assigned by the source node.

5. The method according to claim 1, wherein the next hop node of the first node is a destination node of the path, and after the first node sends the second impairment information to the destination node, the destination node updates the physical impairment parameter of the residual wavelength at the first node to a physical impairment parameter of the residual wavelength at the destination node, judges whether the physical impairment parameter of the residual wavelength at the destination node exceeds the preset range, and when the residual wavelength comprises a wavelength whose physical impairment parameter does not exceed the preset range, determines a wavelength from the wavelength whose physical impairment parameter does not exceed the preset range as a wavelength used for establishing a path.

6. The method according to claim 1, wherein

when the all or a part of available wavelengths no longer comprise a residual wavelength after the wavelength whose physical impairment parameter at the first node exceeds the preset range is deleted, the first node notifies a source node of the path, and the source node assigns another one or more available wavelengths to the path.

7. The method according to claim 1, wherein

when the all or a part of available wavelengths no longer comprise a residual wavelength after the wavelength whose physical impairment parameter at the first node exceeds the preset range is deleted, the first node notifies a source node of the path, and the source node recalculates a path and assigns another one or more available wavelengths to the recalculated path.

8. A node, comprising:

an updating module, configured to receive first impairment information from a previous hop node of a current node, wherein the first impairment information comprises a physical impairment parameter of one or more available wavelengths at the previous hop node;

update the first impairment information, wherein physical impairment parameters of all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are updated to physical impairment parameters of the all or a part of available wavelengths at the current node, wherein the physical impairment parameters of the all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are comprised in the first impairment information;

a deleting module, configured to judge whether the physical impairment parameters of the all or a part of available wavelengths at the current node exceed a preset range; and

when the all or a part of available wavelengths comprise a wavelength whose physical impairment parameter at the current node exceeds the preset range, delete the wavelength whose physical impairment parameter at the current node exceeds the preset range; and

a sending module, configured to send second impairment information to a next hop node of the current node when the all or a part of available wavelengths still comprise a residual wavelength after the deleting module deletes the wavelength whose physical impairment parameter at the current node exceeds the preset range, wherein the second impairment information comprises a physical impairment parameter of the residual wavelength at the current node.

9. The method according to claim 8, further comprising:

a notification module, configured to, when the all or a part of available wavelengths no longer comprise a residual wavelength after the deleting module deletes the wavelength, notify a source node of a path on which the current node is located, so that the source mode assigns another one or more available wavelengths to the path, or when the all or a part of available wavelengths no longer comprise a residual wavelength after the deleting module deletes the wavelength, notifies the source node, so that the source node recalculates a path and assigns another one or more available wavelengths to the recalculated path.

10. A network system, comprising a first node, a previous hop node of the first node, and a next hop node of the first node, wherein

the first node is configured to:

receive first impairment information from the previous hop node of the first node, wherein the first impairment information comprises a physical impairment parameter of one or more available wavelengths at the previous hop node;

update the first impairment information, wherein physical impairment parameters of all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are updated to physical impairment parameters of the all or a part of available wavelengths at the first node, wherein the physical impairment parameters of the all or a part of available wavelengths of the one or more available wavelengths at the previous hop node are comprised in the first impairment information;

judge whether the physical impairment parameters of the all or a part of available wavelengths at the first node exceed a preset range;

when the all or a part of available wavelengths comprise a wavelength whose physical impairment parameter at the first node exceeds the preset range, delete the wavelength whose physical impairment parameter at the first node exceeds the preset range; and

when the all or a part of available wavelengths still comprise a residual wavelength after the wavelength whose physical impairment parameter at the first node exceeds the preset range is deleted, send second impairment information to the next hop node of the first node, wherein the second impairment information comprises a physical impairment parameter of the residual wavelength at the first node.

11. The system according to claim 10, wherein

the previous hop node of the first node is a source node of the path, and the one or more available wavelengths are assigned by the source node.

12. The system according to claim 10, wherein the next hop node of the first node is a destination node of the path, and the destination node is configured to receive the second impairment parameter, update the physical impairment parameter of the residual wavelength at the first node to physical impairment information of the residual wavelength at the destination node, judge whether the physical impairment parameter of the residual wavelength at the destination node exceeds a preset range, and when the residual wavelength comprises a wavelength whose physical impairment parameter does not exceed the preset range, determine a wavelength form the wavelength whose physical impairment parameter does not exceed the preset range as a wavelength used for establishing a path.