Localized forwarding

• US 9,532,293 B2
• Filed: 03/18/2010
• Issued: 12/27/2016
• Est. Priority Date: 03/18/2009
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Koodli, Rajeev, Chowdhury, Kuntal, Ramankutty, Rajesh
• Primary Examiner(s): ZUNIGA ABAD, JACKIE
• Application Number:
  US12/726,906
• Publication Number:
  US 20100238887A1
• Time in Patent Office: 2,476 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/14 Charging , metering or billing arrangements for data wireline or wireless communications
• CPC Class Codes: H04L 63/304 intercepting circuit switched data communications lawful interception of wireless network communications H04W12/02
• CPC Class Codes: H04W 12/037 of the control plane, e.g. signalling traffic
• CPC Class Codes: H04W 12/80 Arrangements enabling lawful interception [LI]
• CPC Class Codes: H04W 36/322 by location data
• CPC Class Codes: H04W 36/385 of the core network

Abstract

Systems and methods for call localization are provided. The call localization can be provided in a radio access network by detecting a call flow between mobile node such as user equipment (UE) served by the same radio access network device. For example, a gateway can detect a call localization opportunity and the call can be localized with an evolved nodeB (eNB). The method provides for efficient routing, reporting of billing information, lawful monitoring, and mobility if one or both user equipment leave the common eNB.

Claims

1. A method comprising:

maintaining information about mobile terminals communicating in a network, the network including a gateway in communication with radio access networks (RANs) and capable of wireless communication with a plurality of mobile terminals, the mobile terminals including a first mobile terminal and a second mobile terminal, wherein the information about the mobile terminals includes location information of the first and second mobile terminals;

receiving, by the gateway from a policy server, rules specifying conditions under which a packet flow can be confined to two mobile terminals and an evolved Node B (eNodeB) to be coupled to the two mobile terminals;

determining, at the gateway, based at least in part on the location information of the first and second mobile terminals, whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same evolved Node B (eNodeB) in a first radio access network (RAN);

in response to a determination that the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same eNodeB, sending control information, pursuant to the rules, to the eNodeB to cause the packet flow between the first mobile terminal and the second mobile terminal to be routed locally through the eNodeB without passing through the gateway to cause the packet flow to be confined to the first mobile terminal, the second mobile terminal, and the eNodeB; and

wherein the location information of the first and second mobile terminals includes enhanced cell global identifiers (ECGIs) and wherein the determining whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through the same eNodeB includes determining whether an ECGI value assigned to the first mobile terminal is identical to an ECGI value assigned to the second mobile terminal.

2. The method of claim 1, wherein the network has a serving gateway and a packet gateway, the serving gateway in communication with the packet gateway and a plurality of RANs including the first RAN and a second RAN and wherein, in response to the second mobile terminal being handed over from the first RAN to the second RAN, the network causing the packet flow to be routed through the first RAN, the serving gateway and a second RAN, without passing through the packet gateway.

3. The method of claim 1, wherein the rules indicate that the network can allow the packet flow to be routed locally through the eNodeB without passing through the gateway when both the first mobile terminal and the second mobile terminal are communicating through the same eNodeB.

4. The method of claim 1, wherein the location information of the first and second mobile terminals is maintained at a policy and charging rules function (PCRF).

5. The method of claim 1, wherein the network includes a serving gateway in communication with one or more RANs, and a packet gateway in communication with one or more serving gateways.

6. The method of claim 1, further comprising, if routed locally through the eNodeB, performing, at the eNodeB, lawful interception and one or more of updating statistics and billing.

7. The method of claim 1, wherein a policy and charging rules function (PCRF), which is in communication with the gateway, maintains a set of ECGI values assigned to the mobile terminals and the gateway caches a set of mobile terminals with a same ECGI value.

8. The method of claim 1, wherein the control information is sent to the eNodeB from a mobility management entity (MME) that is in communication with the gateway.

9. The method of claim 1, wherein, as the second mobile terminal is being handed over from the first RAN to the second RAN, the eNodeB receives a control message from a mobility management entity (MME) in communication with a target eNodeB in the second RAN, the control message including an instruction for the eNodeB to stop the local routing of the packet flow.

10. A gateway in communication with radio access networks (RANs) and capable of wireless communication with a plurality of mobile terminals, the gateway comprising:

a memory capable of storing data; and

a processor configured for using the data such that the gateway can;

maintain information about the plurality of mobile terminals including location information of the first and second mobile terminals, the plurality of mobile terminals including a first mobile terminal and a second mobile terminal;

receive, from a policy server, rules specifying conditions under which a packet flow can be confined to two mobile terminals and an evolved Node B (eNodeB) to be coupled to the two terminals;

determine, based at least in part on the location information of the first and second mobile terminals, whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same evolved Node B (eNodeB) in a first radio access network (RAN);

in response to a determination that the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same eNodeB, send control information, pursuant to the rules, to the eNodeB to cause the packet flow between the first mobile terminal and the second mobile terminal to be routed locally through the eNodeB without passing through the gateway to cause the packet flow to be confined to the first mobile terminal, the second mobile terminal, and the eNodeB; and

wherein the location information of the first and second mobile terminals includes enhanced cell global identifiers (ECGIs) and wherein the determining whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through the same eNodeB includes determining whether an ECGI value assigned to the first mobile terminal is identical to an ECGI value assigned to the second mobile terminal.

11. The gateway of claim 10, wherein the gateway comprises a serving gateway and a packet gateway, wherein the serving gateway is in communication with the packet gateway and a plurality of RANs including the first RAN and a second RAN, and wherein, in response to the second mobile terminal being handed over from the first RAN to the second RAN, the serving gateway causes the packet flow to be routed through the first RAN, the serving gateway, and the second RAN, without passing through the packet gateway.

12. The gateway of claim 10, wherein the rules that the packet flow is allowed to be routed locally through the eNodeB without passing through the gateway when both the first mobile terminal and the second mobile terminal are communicating through the same eNodeB.

13. The gateway of claim 10, wherein the location information of the first and second mobile terminals is maintained at a policy and charging rules function (PCRF).

14. The gateway of claim 10, wherein a policy and charging rules function (PCRF), which is in communication with the gateway, maintains a set of ECGI values assigned to the mobile terminals and the gateway caches a set of mobile terminals with a same ECGI value.

15. The gateway of claim 10, wherein the control information is sent to the eNodeB from a mobility management entity (MME) that is in communication with the gateway.

16. The gateway of claim 10, wherein, as the second mobile terminal is being handed over from the first RAN to the second RAN, the eNodeB receives a control message from a mobility management entity (MME) in communication with a target eNodeB in the second RAN, the control message including an instruction for the eNodeB to stop the local routing of the packet flow.

17. The gateway of claim 10, wherein the processor is further configured for using the data such that the gateway can also perform, at the eNodeB, lawful interception and one or more of updating statistics and billing, if the packet flow between the first mobile terminal and the second mobile terminal is routed locally through the eNodeB.

18. A computer program product residing on a non-transitory computer readable medium, the computer program product comprising computer executable instructions which, when executed by one or more processors in an apparatus, cause the apparatus to perform a method, the method comprising:

maintaining information about mobile terminals communicating in a network, the network including a gateway in communication with radio access networks (RANs) capable of wireless communication with a plurality of mobile terminals, the mobile terminals including a first mobile terminal and a second mobile terminal, wherein the information about the mobile terminals includes location information of the first and second mobile terminals;

receiving, by the gateway from a policy server, rules specifying conditions under which a packet flow can be confined to two mobile terminals and an evolved Node B (eNodeB) to be coupled to the two mobile terminals;

determining, at the gateway, based at least in part on the location information of the first and second mobile terminals, whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same evolved Node B (eNodeB) in a first radio access network (RAN);

in response to a determination that the first mobile terminal and the second mobile terminal are communicating in a packet flow through a same eNodeB, sending control information, pursuant to the rules, to the eNodeB to cause the packet flow between the first mobile terminal and the second mobile terminal to be routed locally through the eNodeB without passing through the gateway to cause the packet flow to be confined to the first mobile terminal, the second mobile terminal, and the eNodeB; and

wherein the location information of the first and second mobile terminals includes enhanced cell global identifiers (ECGIs) and wherein the determining whether the first mobile terminal and the second mobile terminal are communicating in a packet flow through the same eNodeB includes determining whether an ECGI value assigned to the first mobile terminal is identical to an ECGI value assigned to the second mobile terminal.