METHOD AND SYSTEM FOR PRE-RESERVATION TIMER ADAPTATION IN PCE BASED NETWORKS

• US 20140205288A1
• Filed: 01/17/2014
• Published: 07/24/2014
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Telefonica SA
• Original Assignee: Telefonica SA
• Inventors: ALVAREZ, Victor Lopez
• Granted Patent: US 9,398,353 B2
• Time in Patent Office: Days
• US Class Current: 398/48
• CPC Class Codes: H04L 45/42 Centralised routing
• CPC Class Codes: H04Q 11/0003 Details

Abstract

The method updating the status of a network by means of a protocol of the control plane of said network and in response to a path request from at least a path computation client (PCC) pre-reserving during a reserved period of time (T_res), by at least one path computation element (PCE), a plurality of network resources in at least one traffic engineering database (TED) of the at least one PCE. The method dynamically modifying by a timer policy said reserved period of time (T_res) by at least using information data regarding the delay of said control plane.

The system of the invention is adapted to implement the method of the invention.

Claims

1. A method for Pre-Reservation timer adaptation in PCE based networks, comprising updating the status of a network by means of a protocol of the control plane of said network and in response to a path request from at least a path computation client (PCC) pre-reserving during a reserved period of time (T_res), by at least one path computation element (PCE), a plurality of network resources in at least one traffic engineering database (TED) of the at least one PCE, characterized in that the method comprises dynamically modifying by a timer policy said reserved period of time (T_res) by at least using information data regarding the delay of said control plane.

2. A method according to claim 1, characterized in that it further uses information data regarding said updated network status.

3. A method according to claim 1, characterized in that it comprises locating said timer policy as a module in at least one network element (NE) of the network.

4. A method according to claim 1, characterized in that it comprises including said timer policy in said at least one PCE as an algorithm.

5. A method according to claim 3, characterized in that said at least one network element (NE) receives information regarding the success or failure of said path request and sends measurements to other network elements (NEs) of said network to measure the delay of said control plane.

6. A method according to claim 4, characterized in that said timer policy receives information from a PCEP controller of said at least one network element (NE).

7. A method according to claim 6, further comprising correlating information provided by said at least one PCE with said information data regarding said updated network status.

8. A method according to claims 1, characterized in that said reserved period of time (T_res) is greater than said control plane delay and smaller than a connection holding time.

12. A system according to claim 1, characterized in that said reserved period decisor module is further adapted for sending said measured reserved period of time to a PCEP controller of said at least one network element (NE) or to a TEDB module of said at least one PCE.

16. A method according to claim 2, comprising locating said timer policy as a module in at least one network element (NE) of the network.

17. A method according to claim 2, comprising including said timer policy in said at least one PCE as an algorithm.

18. A method according to claim 2, wherein said reserved period of time (Tres) is greater than said control plane delay and smaller than a connection holding time.

9. A system for Pre-Reservation timer adaptation in PCE based networks, comprising:

means for updating the status of a network;

at least one path computation element (PCE) adapted to pre-reserve during a reserved period of time (T_res), in response to a path request from at least a path computation client (PCC), a plurality of network resources in at least one traffic engineering database (TED) of the at least one PCE; and

a module including a PCEP decoder, a delay monitor and an I-NNI decoder, characterized in that said module further comprises;

a stolen lambda correlator module adapted for detecting if there are stolen lambda blocks; and

a reserved period decisor module adapted for measuring said reserved period of time, wherein it provides a timer policy adapted to dynamically modify said reserved period of time (T_res) by at least using information data regarding the delay of said control plane.

10. A system according to claim 9, characterized in that said timer policy is located in at least one network element (NE) of said network.

11. A system according to claim 9, characterized in that it comprises including said timer policy in said at least one PCE as an algorithm.

13. A system according to claim 9, characterized in that said timer policy further comprises a plurality of external and internal interfaces.

14. A system according to claim 9, characterized in that said means for updating the network status are at least provided by an Open Shortest Path First (OSPF) protocol.

15. A system according to claim 9, characterized in that said network is at least one Wavelength Switch Optical Network (WSON).