Mobile transport solution for offloading to an alternate network

• US 8,743,696 B2
• Filed: 08/09/2010
• Issued: 06/03/2014
• Est. Priority Date: 08/07/2009
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Chowdhury, Kuntal
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US12/853,125
• Publication Number:
  US 20110058479A1
• Time in Patent Office: 1,394 Days
• Field of Search: None
• US Class Current: 370/237
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application
• CPC Class Codes: H04W 36/22 for handling the traffic

Abstract

This disclosure relates to a system and method for offloading selected data to an alternate communication network. The offloading provides another route for selected packet traffic that can relieve the burden on a mobile operator'"'"'s network, such as the backhaul and core networks. As the proliferation of data rich content and increasingly more capable mobile devices has continued, the amount of data communicated over mobile operator'"'"'s networks has exponentially increased. Upgrading the existing network that was designed for voice calls is not desirable or practical for many mobile operators. This disclosure provides systems and methods for offloading data to the Internet or another IP network to relieve congestion on the mobile operator'"'"'s network.

Claims

1. A gateway comprising:

a first interface that is configured to communicate packets to a packet data network (PDN) for a user equipment;

a second interface that is configured to communicate packets with a radio base station over a backhaul network to communicate with the user equipment;

an offload interface that is configured to communicate offloaded packets with the radio base station over an offload network to communicate with the user equipment, thereby bypassing the backhaul network coupled to the radio base station and the gateway;

an offload eligibility determination module that is configured to determine whether a packet, received from the PDN via the first interface for the user equipment, is eligible to be sent to the radio base station via the offload network based on information included in the packet; and

a processing module that is configured to add routing information to the packet to cause the packet to be routed over the offload network to the radio base station via the offload interface.

2. The gateway of claim 1, wherein the offload network includes a multiprotocol label switching (MPLS) virtual link between the gateway and the radio base station, further wherein the processing module includes a MPLS processing module configured to add a label to the packet for transmission on the MPLS virtual link.

3. The gateway of claim 2, wherein the MPLS processing module is configured to perform label stacking for the label-switched path.

4. The gateway of claim 1, wherein the offload eligibility determination module is configured with policy information received from a policy server.

5. The gateway of claim 1, wherein the gateway is provisioned as a packet data network gateway (PGW) in a long term evolution (LTE) network.

6. The gateway of claim 1, wherein the second interface to communicate packets over the backhaul network includes an S5 and S8 interface.

17. The gateway of claim 1, wherein the processing module is configured to strip routing information associated with an uplink packet received from the radio base station via the offload interface and encapsulate a payload of the uplink packet to cause the uplink packet to be routed to the PDN via the first interface.

18. The gateway of claim 1, wherein the routing information includes a MPLS label.

19. The gateway of claim 2, wherein the processing module is configured to use a Label Edge Router (LER) function to place the packet over a Label Switched Path (LSP) in the offload network using a Label Forwarding Information Base (LIFB).

7. A method comprising:

receiving a packet at a gateway from a packet data network (PDN);

inspecting the packet at an offload eligibility determination module in the gateway by comparing rules based on policy at the gateway with information included in the packet;

upon determining that the packet is offload eligible, modifying the packet at a processing module in the gateway to cause the packet to be routed over an offload network to a radio base station via an offload interface of the gateway; and

upon determining that the packet is not offload eligible, sending the packet to the radio base station over a backhaul network.

8. The method of claim 7, wherein modifying the packet at the processing module includes performing label stacking on the packet.

9. The method of claim 7, wherein the offload network includes a multiprotocol label switching (MPLS) virtual link between the gateway and the radio base station, and wherein modifying the packet at the processing module includes performing a MPLS processing to prepare the packet for transmission on the MPLS virtual link.

10. The method of claim 7, further comprising receiving, at the gateway, policy information for offload eligibility determination from a policy server.

11. The method of claim 7, further comprising directing the packet to an inline service to provide a services on subscriber policies before offloading the packet.

12. The method of claim 7, further comprising:

receiving an offloaded packet from the offload network at the gateway; and

processing the offload packet to create an internet protocol packet for communicating on the packet data network.

13. The method of claim 7, wherein the gateway is provisioned as a packet data network gateway (PGW) and includes a S5 interface for communicating over the backhaul network.

14. A method comprising:

receiving, at a radio base station, a packet from a user equipment;

determining, at the radio base station, a tunnel endpoint IP address of the packet received from the user equipment;

inspecting, at the radio base station, the packet to make a determination of whether the packet is eligible to be routed to a gateway via an offload network, bypassing a backhaul network coupled to the radio base station and the gateway;

upon determining that the packet is offload eligible, sending, by the radio base station, the packet to the gateway via the offload network; and

upon determining that the packet is not offload eligible, sending the packet to the gateway over the backhaul network.

15. The method of claim 14, further comprising determining, at the gateway, whether the packet is eligible to be routed to the gateway via the offload network based on radio bearer ID or radio bearer type.

16. The method of claim 14, wherein the offload network includes a multiprotocol label switching (MPLS) virtual link between the radio base station and the gateway.

20. The method of claim 14, further comprising:

receiving, at the gateway, a packet from the radio base station via the offload network;

stripping, at the gateway, routing information associated with the received packet; and

encapsulating, by the gateway, a payload of the packet to cause the packet to be routed to the PDN.