Versatile system for radio access network session information retrieval

• US 7,924,819 B2
• Filed: 03/23/2006
• Issued: 04/12/2011
• Est. Priority Date: 03/23/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Semper, William Joseph
• Primary Examiner(s): Edouard; Patrick N
• Assistant Examiner(s): WIN, AUNG T
• Application Number:
  US11/387,592
• Publication Number:
  US 20070223452A1
• Time in Patent Office: 1,846 Days
• Field of Search: 370/352, 370/331, 370/351, 370/392, 455/436, 455/442, 709/227
• US Class Current: 370/352
• CPC Class Codes: H04W 8/12 between location registers or mobility servers
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14

Abstract

A session information retrieval system is disclosed that efficiently transfers mobile station session information among certain members of a radio access network. As a mobile station within the network—which is dormant in a first packet data zone of the network—moves to a second packet data zone, a PCF for the second packet zone contacts the PCF for the first packet data zone to retrieve session information for the MS. Having retrieved the MS'"'"'s already-established session information, the second PCF obviates the need to re-establish or re-negotiate session information for the MS. Having forwarded the MS'"'"'s session information to the second PCF, the first PCF may discard the now unneeded session information that would have otherwise been maintained indefinitely—freeing up valuable system resources.

Claims

1. A radio access network system comprising:

a second coverage zone control component configured to control a second set of base stations in a second packet data zone and communicatively coupled to a first coverage zone control component by an incumbent messaging system, the first coverage zone control component configured to control a first set of base stations in a first packet data zone and operatively coupled to a packet data serving node; and

an addressing construct adapted to create a unique locator for each coverage zone control component in the radio access network, each unique locator being an internet protocol (IP) address that is used by a corresponding coverage zone control component to communicate with other coverage zone control components across radio access networks, the IP address comprising octets for a vendor identifier (VID), a system identifier (SID), a network identifier (NID), and a packet zone identifier (PZID) of the corresponding coverage zone control component,

wherein the second coverage zone control component is further configured to retrieve session information for a packet data session for a mobile station over the incumbent messaging system, the second coverage zone control component communicating with the first coverage zone control component by utilizing the first coverage zone control component'"'"'s unique locator, and wherein the first coverage zone control component'"'"'s unique locator is received by the second coverage zone control component from the mobile station.

2. The system of claim 1, wherein the coverage zone control components comprise packet control functions.

3. The system of claim 1, wherein the second coverage zone control component communicates a unique identifier of the mobile station to the first coverage zone control component to retrieve the session information.

4. The system of claim 3, wherein the unique identifier of the mobile station comprises an international mobile subscriber identity (IMSI).

5. The system of claim 3, wherein the mobile station sends the first coverage zone control component'"'"'s unique locator and the unique identifier of the mobile station to the second coverage zone control component in response to detecting that the mobile station has moved from the first packet data zone to the second packet data zone based on a broadcast signal received from at least one of the second set of base stations, the broadcast signal comprising identification data of the second coverage zone control component.

6. The system of claim 1, wherein the unique locator comprises a look-up table locator.

7. The system of claim 1, wherein the addressing construct comprises at least one of an automated software component and an operator-initiated routine.

8. The system of claim 1, wherein the first coverage zone control component discards the session information after the second coverage zone control component has retrieved the session information.

9. A method of retrieving session information for a mobile station in a radio access network, comprising the steps of:

receiving, at a second packet control function (PCF), a message that a mobile station has moved into a second packet data zone from a first packet data zone, the second PCF configured to control packet data sessions in a second set of base stations in the second packet data zone, the first PCF configured to control packet data sessions in a first set of base stations in the first packet data zone, the message indicating that the mobile station has an already established packet data session with a first PCF;

determining a unique identifier of the first PCF from the message, the unique identifier comprising an internet protocol (IP) address that is used to communicate with a plurality of PCFs across radio access networks, the IP address comprising octets for a vendor identifier (VID), a system identifier (SID), a network identifier (NID), and a packet zone identifier (PZID) of the first PCF;

transmitting a request to the first PCF for a session information of the already established packet data session, the request transmitted by the second PCF using the unique identifier of the first PCF; and

storing, in the second PCF, the session information that is received from the first PCF.

10. The method of claim 9, wherein the radio access network is a spread-spectrum wireless network.

11. The method of claim 10, wherein the request comprises a unique identifier of the mobile station.

12. The method of claim 11, wherein the mobile station sends the first PCF'"'"'s unique locator and the unique identifier of the mobile station to the second PCF in response to detecting that the mobile station has moved from the first packet data zone to the second packet data zone based on a broadcast signal received from at least one of the second set of base stations, the broadcast signal comprising identification data of the second PCF.

13. The method of claim 9, wherein the message that the mobile station has moved into the second packet data zone is received from a base station in the second coverage zone.

14. The method of claim 9, wherein sending the request for the session information comprises providing at least one of the mobile station'"'"'s international mobile subscriber identity, the mobile station'"'"'s electronic serial number, and the mobile station'"'"'s mobile equipment identifier.

15. A radio access network system comprising:

a second packet control function (PCF) configured to manage packet data sessions for a second set of base stations within a second packet data zone, the second PCF having a second unique identifier and being communicatively coupled to a first PCF that is configured to manage packet data sessions for a first set of base stations within a first packet data zone and has a first unique identifier, the first and second unique identifiers comprising unique addresses in the radio access network,

wherein each unique identifier comprises an internet protocol (IP) address that is used by a corresponding PCF to communicate with a plurality of PCFs across radio access networks, the IP address comprising octets for a vendor identifier (VID), a system identifier (SID), a network identifier (NID), and a packet zone identifier (PZID) of the corresponding PCF,

wherein the second PCF is further configured to transmit a request to the first PCF for a session information of a mobile station that has entered the second packet data zone from the first packet data zone, the request transmitted utilizing the first PCF'"'"'s unique identifier that was received from the mobile station.

16. The system of claim 15 further comprising an incumbent messaging system communicatively coupling the first PCF and the second PCF.

17. The system of claim 15 wherein the request comprises a unique identifier of the mobile station.

18. The system of claim 15, wherein the unique identifier of the mobile station comprises an international mobile subscriber identity (IMSI).

19. The system of claim 18, wherein the mobile station sends the first PCF'"'"'s unique locator and the unique identifier of the mobile station to the second PCF in response to detecting that the mobile station has moved from the first packet data zone to the second packet data zone based on a broadcast signal received from at least one of the second set of base stations, the broadcast signal comprising identification data of the second PCF.

20. The system of claim 15, wherein the first PCF discards the session information from the first PCF after transmitting the session information to the second PCF.