Method for cell change in a packet-mode cellular mobile radiocommunication system

• US 20040246923A1
• Filed: 05/21/2004
• Published: 12/09/2004
• Est. Priority Date: 11/23/2001
• Status: Abandoned Application

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Achard, Jacques
• Application Number:
  US10/496,511
• Publication Number:
  US 20040246923A1
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time

Abstract

A cell changing method for a packet-mode cellular mobile radio system, in which method information relating to resources allocated to a mobile station in a new cell is signaled by the network to said mobile station when said mobile station is still in the old cell and information intended to enable the mobile station to determine a timing advance to be applied by said mobile station in the new cell is also signaled by the network to said mobile station when said mobile station is still in the old cell.

Claims

1. A cell changing method for a packet-mode cellular mobile radio system, in which method information relating to resources allocated to a mobile station in a new cell is signaled by the network to said mobile station when said mobile station is still in the old cell and information intended to enable the mobile station to determine a timing advance to be applied by said mobile station in the new cell is also signaled by the network to said mobile station when said mobile station is still in the old cell.

17. A mobile station according to claim 1, wherein said information is sent in a message sent in a first uplink block sent to the network by the mobile station in the new cell.

18. A mobile station according to claim 1, wherein said information is sent in a cell update message sent to the network by the mobile station in the new cell.

2. A mobile station for a packet-mode cellular mobile radio system, said station comprising:

means for receiving from the network information sent by an old cell and indicating that the real time difference RTD between the old cell and the new cell is equal to zero, and

means for determining a timing advance value TA1 to be used in the new cell from a measured observed time difference OTD between the new cell and the old cell and a timing advance value TA0 used in the old cell, using the equation TA1=OTD+TA0.

3. A mobile station according to claim 2, wherein said information indicating that the real time difference RTD between the old cell and the new cell is equal to zero is sent in a message allocating resources to the mobile station in the new cell.

24. A packet-mode cellular mobile radio system comprising at least one mobile station according to claim 2.

4. A mobile station for a packet-mode cellular mobile radio system, said station comprising:

means for receiving from the network information sent by an old cell comprising the real time difference RTD between the old cell and a new cell, and

means for determining a timing advance value TA1 to be used in the new cell from a measured observed time difference OTD between the new cell and the old cell, a timing advance value TA0 used in the old cell, and said real time difference RTD sent by the old cell, using the equation TA1=OTD−

RTD+TA0.

5. A mobile station according to claim 4, wherein said real time difference RTD between the old cell and the new cell is sent in a message allocating resources to the mobile station in the new cell.

6. A mobile station for a packet-mode cellular mobile radio system, said station comprising:

means for receiving from the network a timing advance value TA1 sent by an old cell and to be used in a new cell.

7. A mobile station according to claim 6, wherein said timing advance value TA1 to be used in the new cell is sent in a message allocating resources to the mobile station in the new cell.

8. Packet-mode cellular mobile network equipment comprising:

means for an old cell to send to a mobile station information intended to indicate that the real time difference RTD between the old cell and a new cell is equal to zero.

9. Network equipment according to claim 8, wherein said information intended to indicate that the real time difference RTD between the old cell and the new cell is equal to zero is sent in a message allocating resources to the mobile station in the new cell.

25. A packet-mode cellular mobile radio system comprising at least one network equipment according to claim 8.

10. Packet-mode cellular mobile network equipment comprising:

means for an old send cell to send to a mobile station information comprising the real time difference RTD between the old cell and a new cell.

11. Network equipment according to claim 10, wherein said real time difference RTD between the old cell and the new cell is sent in a message allocating resources to the mobile station in the new cell.

12. Packet-mode cellular mobile radio network equipment comprising:

means for an old cell to send to a mobile station information comprising a timing advance value TA1 to be used in a new cell.

13. Network equipment according to claim 12, wherein said timing advance value to be used in the new is sent in a message allocating resources to the mobile station in the new cell.

14. A packet-mode cellular mobile radio system mobile station comprising:

means for communicating to the network information intended to enable the network to acquire a real time difference RTD between an old cell and a new cell.

15. A mobile station according to claim 14, wherein said information includes a measured observed time difference OTD between the new cell and the old cell and a timing advance value used in the old cell and sent to the network by the mobile station in the new cell.

16. A mobile station according to claim 14, wherein said information is sent in a first acknowledgement message sent to the network by the mobile station in the new cell.

19. Packet-mode cellular mobile radio network equipment comprising:

means for receiving from a mobile station information intended to enable the network to acquire information comprising a real time difference RTD between an old cell and a new cell.

20. Network equipment according to claim 19, wherein said information includes a measured observed time difference OTD between the new cell and the old cell and a timing advance value used in the old cell and sent to the network by the mobile station in the new cell.

21. Network equipment according to either claim 19, wherein said information is sent in a first acknowledgement message sent to the network by the mobile station in the new cell.

22. Network equipment according to claim 19, wherein said information is sent in a message sent in a first uplink block sent to the network by the mobile station in the new cell.

23. Network equipment according to claim 19, wherein said information is sent in a cell update message sent to the network by the mobile station in the new cell.