Methods and apparatus for providing end marker functionality in mobile networks having SRv6-configured mobile user planes

• US 10,419,982 B1
• Filed: 03/14/2018
• Issued: 09/17/2019
• Est. Priority Date: 03/14/2018
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Gundavelli, Srinath, Lakkaraju, Sangram Kishore, Stammers, Timothy Peter
• Primary Examiner(s): Clawson, Stephen J
• Application Number:
  US15/921,533
• Publication Number:
  US 20190289508A1
• Time in Patent Office: 552 Days
• Field of Search: 370331
• CPC Class Codes: H04L 45/34 Source routing
• CPC Class Codes: H04L 47/825 Involving tunnels, e.g. MPLS
• CPC Class Codes: H04W 36/0033 with transfer of context information
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 36/023 Buffering or recovering information during reselection

Abstract

End marker functionality may be provided in mobile networks having mobile user planes configured with segment routing for IPv6 (SRv6), especially suitable for 5G network migration. For example, a base station may receive an SRv6 control message from a user plane function (UPF) which carries data traffic of a data session for the UE. The base station may perform a function associated with a segment identifier (SID) identified in a segment routing header (SRH) of the SRv6 control message. The function may be an end marker handling function associated with an end marker SID. Performing the end marker handling function may cause the base station to generate a tunneling protocol message (e.g. according to GPRS tunneling protocol or GTP) comprising an end marker message and send the tunneling protocol message comprising the end marker message for receipt by the target base station.

Claims

1. A method comprising:

at a base station configured for use in a mobile network, and operative as a source base station for a handover of a user equipment (UE) to a target base station;

receiving an Internet Protocol (IP) message from a user plane (UP) entity which carries data traffic of a data session for the UE; and

performing a function associated with a segment identifier identified in a segment routing header (SRH) of the IP message, the function comprising an end marker handling function associated with the segment identifier.

2. The method of claim 1, wherein the IP message comprises a segment routing (SR) for IP version 6 (IPv6) (SRv6) message, the segment identifier comprises an end marker segment identifier (SID), and the end marker handling function comprises an SRv6 function which is provisioned at the base station.

3. The method of claim 2, wherein the source base station and the target base station communicate with each other in accordance with a General Packet Radio Service (GPRS) tunneling protocol (GTP), and wherein performing the end marker handling function comprises:

generating a tunneling protocol message comprising an end marker message; and

sending the tunneling protocol message comprising the end marker message for receipt by the target base station.

4. The method of claim 3, wherein generating and sending the tunneling protocol message further comprises generating and sending a General Packet Radio Service (GPRS) tunneling protocol (GTP) message comprising the end marker message over a tunnel comprising a GTP tunnel.

5. The method of claim 4, wherein generating the end marker message makes use of a tunnel endpoint identifier (TEID) identified in the SRv6 message.

6. The method of claim 3, wherein the tunneling protocol message comprising the end marker message causes the target base station to release buffered data packets from the UP entity for transmission to the UE.

7. The method of claim 2, wherein the source base station and the target base station communicate with each other in accordance with SRv6, and performing the end marker handling function comprises:

generating a new IP message having a segment routing header which includes a segment identifier associated with a function comprising an end marker message function; and

sending the new IP message for receipt by the target base station.

8. The method of claim 2, wherein the end marker handling function associated with the end marker SID is provisioned at each one of a plurality of base stations which includes the base station.

9. The method of claim 2, wherein the end marker SID comprises a non-routable SID.

10. The method of claim 2, wherein the SRH includes a routable SID which precedes a non-routable SID which comprises the end marker SID.

11. The method of claim 2, further comprising:

when an interface or communications with the target base station comprises a General Packet Radio Service (GPRS) tunneling protocol (GTP), performing the end marker handling function comprising generating a tunneling protocol message comprising an end marker message and sending the tunneling protocol message comprising the end marker message for receipt by the target base station;

or

when the interface or communications with the target base station comprises an SRv6 protocol, performing the end marker handling function comprising generating a new IP message having a segment routing header which includes a segment identifier associated with a function comprising an end marker message function, and sending the new IP message for receipt by the target base station.

12. The method of claim 1, wherein receiving the IP message from the UP entity comprises receiving the IP message from a user plane function (UPF) configured for segment routing (SR) for IP version 6 (IPv6) (SRv6).

13. A base station, comprising:

a controller;

a transceiver circuit coupled to the controller and configured for wireless communication with a user equipment (UE);

a first interface configured for communication with a user plane (UP) entity assigned to the UE for a data session;

a second interface configured for communication with a target base station in a handover of the UE while the base station operates as a source base station;

the controller being configured to;

receive via the first interface a segment routing (SR) for Internet Protocol version 6 (IPv6) (SRv6) message from the UP entity which carries data traffic of the data session for the UE; and

perform a function associated with a segment identifier (SID) identified in a segment routing header (SRH) of the SRv6 message, the function comprising an end marker handling function associated with the SID.

14. A method, comprising:

at a control plane (CP) entity for session management,

receiving a message indicating a handover of a user equipment (UE) from a source base station to a target base station;

generating an Internet Protocol (IP) message which includes a segment routing header populated with a segment identifier associated with an end marker handling function; and

sending the IP message to a user plane (UP) entity assigned to the UE for forwarding to the source base station.

15. The method of claim 14, wherein the IP message comprises a segment routing (SR) for IP version 6 (IPv6) (SRv6) message, the segment identifier comprises an end marker segment identifier (SID), and the end marker handling function comprises an SRv6 function which is provisioned at the base station.

16. The method of claim 15, wherein sending the IP message to the UP entity is for forwarding to the source base station as an instruction to perform the end marker handling function which is provisioned at the source base station.

17. The method of claim 15, further comprising:

when an interface or communication between the source and the target base stations comprises a General Packet Radio Service (GPRS) tunneling protocol (GTP), populating the IP message with a first end marker segment identifier associated with a first end marker handling function; and

when the interface or communication between the source and the target base stations comprises an SRv6 protocol, populating the IP message with a second end marker segment identifier associated with a second end marker handling function.

18. The method of claim 15, further comprising:

populating the IP message with a tunnel endpoint identifier (TEID) associated with the UE.

19. The method of claim 15, wherein the end marker handling function for use at the source base station comprises:

generating a tunneling protocol message comprising an end marker message; and

sending the tunneling protocol message comprising the end marker message for receipt by the target base station.

20. The method of claim 15, wherein the end marker handling function for use at the source base station comprises:

generating a new IP message having a segment routing header which includes a segment identifier associated with a function comprising an end marker message function; and

sending the new IP message for receipt by the target base station.