METHOD AND SYSTEM FOR PERFORMING CELL UPDATE AND ROUTING AREA UPDATE PROCEDURES WHILE A WIRELESS TRANSMIT/RECEIVE UNIT IS IN AN IDLE STATE

• US 20080167054A1
• Filed: 01/26/2007
• Published: 07/10/2008
• Est. Priority Date: 01/31/2006
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shaheen, Kamel M.
• Application Number:
  US11/627,412
• Publication Number:
  US 20080167054A1
• Time in Patent Office: Days
• US Class Current: 455/458
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 8/12 between location registers or mobility servers

Abstract

A method and system for performing cell update and routing area (RA) update procedures while a wireless transmit/receive unit (WTRU) is in an idle state in a third generation (3G) long term evolution (LTE) wireless communication system. When the WTRU receives a page message or has data to transmit while the WTRU is in an idle state, the WTRU transitions to an active state and sends a cell update message to an evolved Node-B (eNode-B). The eNode-B forwards the cell update message to a mobility management entity (MME)/user plane entity (UPE). The MME/UPE changes the state of the WTRU to an active state and takes an action based on the cell update message. When the WTRU moves to a new RA, the WTRU sends an RA update message to the MME/UPE via the eNode-B. The MME/UPE updates the RA of the WTRU based on the RA update message.

Claims

1. In a wireless communication system including a wireless transmit/receive unit (WTRU), an evolved Node-B (eNode-B) and a mobility management entity (MME)/user plane entity (UPE), a method of performing a cell update procedure while the WTRU is in an idle state, the method comprising:

the WTRU transitioning from an idle state to an active state;

the WTRU sending a cell update message to the eNode-B;

the eNode-B forwarding the cell update message to the MME/UPE; and

the MME/UPE changing a state machine for the WTRU in the MME/UPE to an active state and taking an action based on the cell update message.

2. The method of claim 1 further comprising:

the WTRU receiving a page message while in the idle state, wherein the WTRU sends the cell update message along with a page response message in response to the page message.

3. The method of claim 1 wherein the cell update message includes a radio network temporary identity (RNTI) of the WTRU and the eNode-B selects an MME/UPE among a plurality of MMEs/UPEs based on the RNTI.

4. The method of claim 1 wherein the WTRU sends the cell update message when the WTRU has data to transmit.

5. The method of claim 1 further comprising:

the MME/UPE sending a cell update confirm message and a radio access bearer (RAB) establishment message to the WTRU via the eNode-B;

the eNode-B and the WTRU establishing an RAB based on the RAB establishment message;

the WTRU sending an RAB establishment and cell update complete message to the MME/UPE via the eNode-B; and

the MME/UPE and the WTRU communicating user data.

6. The method of claim 1 wherein the WTRU sends the cell update message periodically.

7. The method of claim 1 wherein the WTRU sends the cell update message when one of a radio link control (RLC) unrecoverable error, a radio link failure, reentering service area and cell reselection occurs.

8. The method of claim 1 wherein the wireless communication system is a third generation (3G) long term evolution (LTE) wireless communication system.

9. In a wireless communication system including a wireless transmit/receive unit (WTRU), an evolved Node-B (eNode-B) and a mobility management entity (MME)/user plane entity (UPE), a method of performing a routing area (RA) update procedure while the WTRU is in an idle state, the method comprising:

the WTRU in an idle state reading system information transmitted by the eNode-B;

the WTRU transitioning from an idle state to an active state if it is determined that the WTRU is in a new RA based on the system information;

the WTRU sending an RA update message to the eNode-B;

the eNode-B forwarding the RA update message to the MME/UPE; and

the MME/UPE updating the RA for the WTRU based on the RA update message.

10. The method of claim 9 wherein the RA update message includes a radio network temporary identity (RNTI) of the WTRU and the eNode-B selects an MME/UPE among a plurality of MMEs/UPEs based on the RNTI.

11. The method of claim 9 wherein the WTRU receives the system information via a broadcast control channel (BCCH).

12. The method of claim 9 further comprising:

the MME/UPE sending an RA update confirm message to the WTRU via the eNode-B; and

the WTRU sending an RA update complete message to the MME/UPE via the eNode-B.

13. The method of claim 12 further comprising:

the WTRU transitioning to an idle state after sending the RA update complete message; and

the MME/UPE changing a state machine for the WTRU in the MME/UPE to an idle state.

14. The method of claim 9 wherein the WTRU sends the RA update message periodically.

15. The method of claim 9 wherein the wireless communication system is a third generation (3G) long term evolution (LTE) wireless communication system.

16. A wireless communication system configured to perform a cell update procedure while a wireless transmit/receive unit (WTRU) is in an idle state, the system comprising:

a WTRU configured to transition from an idle state to an active state and send a cell update message to an evolved Node-B (eNode-B);

the eNode-B configured to forward the cell update message to a mobility management entity (MME)/user plane entity (UPE); and

the MME/UPE configured to change a state machine for the WTRU in the MME/UPE to an active state and take an action based on the cell update message.

17. The system of claim 16 wherein the WTRU is configured to receive a page message while in the idle state and send the cell update message along with a page response message in response to the page message.

18. The system of claim 16 wherein the cell update message includes a radio network temporary identity (RNTI) of the WTRU and the eNode-B is configured to select an MME/UPE among a plurality of MMEs/UPEs based on the RNTI.

19. The system of claim 16 wherein the WTRU is configured to send the cell update message when the WTRU has data to transmit.

20. The system of claim 16 wherein the MME/UPE is configured to send a cell update confirm message and a radio access bearer (RAB) establishment message to the WTRU via the eNode-B and communicate user data with the WTRU after receiving an RAB establishment and cell update complete message from the WTRU, and the WTRU is configured to send the RAB establishment and cell update complete message to the MME/UPE after establishing an RAB with the eNode-B and communicate the user data with the MME/UPE.

21. The system of claim 16 wherein the WTRU is configured to send the cell update message periodically.

22. The system of claim 16 wherein the WTRU is configured to send the cell update message when one of a radio link control (RLC) unrecoverable error, a radio link failure, reentering service area and cell reselection occurs.

23. The system of claim 16 wherein the wireless communication system is a third generation (3G) long term evolution (LTE) wireless communication system.

24. A wireless communication system configured to perform a routing area (RA) update procedure while a wireless transmit/receive unit (WTRU) is in an idle state, the system comprising:

a WTRU configured to read system information transmitted by an evolved Node-B (eNode-B) while the WTRU is in an idle state, transition from an idle state to an active state if it is determined that the WTRU is in a new RA based on the system information, and send an RA update message to the eNode-B;

the eNode-B configured to forward the RA update message to a mobility management entity (MME)/user plane entity (UPE); and

the MME/UPE configured to update an RA for the WTRU based on the RA update message.

25. The system of claim 24 wherein the RA update message includes a radio network temporary identity (RNTI) of the WTRU and the eNode-B is configured to select an MME/UPE among a plurality of MMEs/UPEs based on the RNTI.

26. The system of claim 24 wherein the WTRU receives the system information via a broadcast control channel (BCCH).

27. The system of claim 24 wherein the MME/UPE is configured to send an RA update confirm message to the WTRU via the eNode-B and the WTRU is configured to send an RA update complete message to the MME/UPE via the eNode-B.

28. The system of claim 27 wherein the WTRU is configured to transition to an idle state after sending the RA update complete message and the MME/UPE is configured to change a state machine for the WTRU in the MME/UPE to an idle state after receiving the RA update complete message.

29. The system of claim 24 wherein the WTRU is configured to send the RA update message periodically.

30. The system of claim 24 wherein the wireless communication system is a third generation (3G) long term evolution (LTE) wireless communication system.