Implementing EPC in a cloud computer with openflow data plane

• US 9,497,661 B2
• Filed: 09/15/2014
• Issued: 11/15/2016
• Est. Priority Date: 05/23/2011
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Kempf, James, Johansson, Bengt E., Pettersson, Sten, Nilsson, Tord K., Lning, Harald
• Primary Examiner(s): Cho, Un C
• Assistant Examiner(s): Roudani, Oussama
• Application Number:
  US14/486,896
• Publication Number:
  US 20150071053A1
• Time in Patent Office: 792 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 41/0695 the faulty arrangement being the maintenance, administration or management system
• CPC Class Codes: H04L 41/40 using virtualisation of network functions or resources, e.g. SDN or NFV entities
• CPC Class Codes: H04L 43/0882 Utilisation of link capacity
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 47/2441 relying on flow classification, e.g. using integrated services [IntServ]
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

A method implements a control plane of an evolved packet core (EPC) of a long term evolution (LTE) network in a cloud computing system. A cloud manager monitors resource utilization of each control plane module and the control plane traffic handled by each control plane module. The cloud manager detects a threshold level of resource utilization or traffic load for one of the plurality of control plane modules of the EPC. A new control plane module is initialized as a separate virtual machine by the cloud manager in response to detecting the threshold level. The new control plane module signals the plurality of network elements in the data plane to establish flow rules and actions to establish differential routing of flows in the data plane using the control protocol, wherein flow matches are encoded using an extensible match structure in which the flow match is encoded as a type-length-value (TLV).

Claims

1. A method for implementing a control plane of a core network of a communications network including a set of access networks each connected to the core network, the control plane implemented in a cloud computing system, the cloud computing system including a cloud manager and a controller, the controller to execute a plurality of control plane modules, the control plane to communicate with a data plane of the core network implemented in a plurality of network elements of the core network through a control protocol, the core network with the control plane implemented in the cloud computing system utilizing resources more efficiently than an architecture with the control plane implemented in the plurality of network elements of the core network, the method comprising the steps of:

initializing the plurality of control plane modules of the core network within the controller, each control plane module in the plurality of control plane modules initialized as a separate virtual machine by the cloud manager, each control plane module to provide a set of control plane functions for managing the data plane;

monitoring, by the cloud manager, resource utilization of each control plane module and the control plane traffic handled by each control plane module;

detecting, by the cloud manager, a threshold level of resource utilization or traffic load for one of the plurality of control plane modules of the core network;

initializing a new control plane module as a separate virtual machine by the cloud manager in response to detecting the threshold level, the new control plane module to share the load of the one of the plurality of control plane modules;

signaling the plurality of network elements in the data plane to establish flow rules and actions to establish differential routing of flows in the data plane using the control protocol, wherein the control protocol is an Open Flow protocol, and wherein flow matches are encoded using an extensible match structure in which a flow match is encoded as a type-length-value (TLV); and

configuring, by the controller, each network element in the plurality of network elements to extend an OpenFlow table to include a general packet radio service (GPRS) tunneling protocol (GTP) header and GTP tunnel endpoint identifier to support forwarding of GTP session flows.

2. The method of claim 1, further comprising the steps of:

detecting a failure of the one of the plurality of control plane modules by the cloud manager; and

restarting the one of the plurality of control plane modules by the cloud manager, in response to detecting the failure.

3. The method of claim 1, wherein the TLV includes an oxm-class field, an oxm_field to identify a subtype within a class, an HM field to specify whether a value contains a bitmask and an oxm_length field to specify a length of a value payload.

4. The method of claim 3, wherein the core network is a part of a fixed mobile network of a first operator, and wherein the signaling establishes a peering point with a second operator of a second fixed mobile network.

5. The method of claim 3, wherein the signaling establishes a routing of data from an external source requested by an end user device to a processing module in the cloud computing system, the processing module to process the data from the external source before forwarding the processed data to the end user device.

6. The method of claim 3, further comprising:

establishing a general packet radio service (GPRS) tunneling protocol (GTP) a GTP session across the core network by the controller in response to a session request from an end user device by signaling each network element to forward the GTP session in the plurality of network elements using an extension of the Open Flow protocol.

7. The method of claim 6, further comprising:

modifying a route of the GTP session across the core network, by the controller, by signaling each of the network elements currently forwarding the GTP session and each of the network elements on a new route for the GTP session using an extension of the OpenFlow protocol.

8. The method of claim 6, wherein the GTP session is any one of a GTP-U, GTP-C, or GTP′

session.

9. The method of claim 1, further comprising:

configuring, by the controller, a network element in the plurality of network elements to provide a virtual port for encapsulating or decapsulating into a general packet radio service (GPRS) tunneling protocol (GTP) GTP tunnel.

10. A cloud computer system for implementing a control plane of a core network of a communications network including a set of access networks each connected to the core network, the control plane to communicate with a data plane of the core network implemented in a plurality of network elements of the core network through a control protocol, the core network with the control plane implemented in the cloud computing system utilizes resources more efficiently than an architecture with the control plane implemented in the plurality of network elements of the core network, the cloud computing system, comprising:

a controller configured to execute a plurality of control plane modules of the core network, each control plane module configured to provide a set of control plane functions for managing the data plane and to signal the plurality of network elements in the data plane to establish flow rules and actions to establish differential routing of flows in the data plane using the control protocol, wherein the control protocol is an OpenFlow protocol, and wherein flow matches are encoded using an extensible match structure in which a flow match is encoded as a type-length-value (TLV); and

a cloud manager communicatively coupled to the controller, the cloud manager configured to;

initialize each of the plurality of control plane modules within the controller as a separate virtual machine,

monitor resource utilization of each control plane module and the control plane traffic handled by each control plane module,

detect whether a threshold level of resource utilization or traffic load has been reached by any of the plurality of control plane modules of the core network, and

initialize a new control plane module as a separate virtual machine in response to detecting the threshold level, the new control plane module to share the load of the one of the plurality of control plane modules that exceeded the threshold level,

wherein the controller configures each network element in the plurality of network elements to extend an Open Flow table to include a general packet radio service (GPFS) tunneling protocol (GTP) header and GTP tunnel endpoint identifier to support forwarding of GTP session flows.

11. The system of claim 10, wherein the plurality of control plane modules of the core network establish and manage general packet radio service (GPRS) tunneling protocol (GTP) sessions in the core network.

12. The system of claim 10, wherein the TLV includes an oxm-class field, an oxm_field to identify a subtype within a class, an HM field to specify whether a value contains a bitmask and an oxm_length field to specify a length of a value payload.

13. The system of claim 10, wherein the cloud manager is also to detect a failure of any of the plurality of control plane modules and restart the failed one of the plurality of control plane modules.

14. The system of claim 13, wherein the core network is a part of a fixed mobile network of a first operator, and wherein the controller'"'"'s signals establish a peering point with a second operator of a second fixed mobile network.

15. The system of claim 13, wherein the controller establishes a routing of data from an external source requested by an end user device to a processing module in the cloud computing system, further comprising:

the processing module to process the data from the external source before forwarding the processed data to the end user device.

16. The system of claim 12, wherein the controller establishes a general packet radio service (GPRS) tunneling protocol (GTP) a GTP session across the core network by the controller in response to a session request from an end user device by signaling each network element to forward the GTP session in the plurality of network elements using an extension of the Open Flow protocol.

17. The system of claim 15, wherein the controller modifies a route of the GTP session across the core network by signaling each of the network elements currently forwarding the GTP session and each of the network elements to forward the GTP session using an extension of the OpenFlow protocol.

18. The system of claim 16, wherein the GTP session is any one of a GTP-U, GTP-C, or GTP′

session.

19. The system of claim 10, wherein the controller configures a network element in the plurality of network elements to provide a virtual port for encapsulating or decapsulating into a general packet radio service (GPRS) tunneling protocol (GTP) GTP tunnel.