Method and system for switching a mobile device in a mobile network

• US 20070049273A1
• Filed: 08/31/2005
• Published: 03/01/2007
• Est. Priority Date: 08/31/2005
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Morgan, William, Proctor, Lee, Magee, Stephen, Nikides, Robert
• Granted Patent: US 7,424,294 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0064 of control information between different access points
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

A method and a system for switching a mobile device (102) from a source Base Transceiver Station (BTS) to a target BTS in a mobile network (100) are disclosed. The method includes detecting an intention to switch the cell transmitted by the mobile device. A Base Station Controller (BSC) (112) then receives the switch detect time from the source BTS and/or the target BTS. The switch detect time is processed by the BSC to determine the switch time for the mobile device. The mobile device then switches from communication with the source BTS to communication with the target BTS, based on the switch time.

Claims

1. A method for switching a mobile device from a source Base Transceiver Station (BTS) to a target BTS in a mobile network, the mobile network enabling communication between a plurality of mobile devices, the method comprising:

detecting a cell switch intention for the mobile device, wherein the cell switch intention is detected by the source BTS and at least one target BTS;

receiving a switch detect time each from at least one of;

the source BTS and the at least one target BTS;

receiving at least one of a source coded BTS identifier from the at least one target BTS and at least one target coded BTS identifier from the source BTS;

determining a switch time for the mobile device based on the switch detect times; and

switching the mobile device from the source BTS to the target BTS based on the switch time.

2. The method according to claim 1, wherein detecting the cell switch intention comprises periodically comparing an average channel power with an average channel power of one or more of a plurality of target BTSs.

3. The method according to claim 1 further comprising sending an acknowledgment message to the source BTS and the at least one target BTS on receiving the switch detect time from the source BTS and the at least one target BTS.

4. The method according to claim 1 further comprising transmitting a modified acknowledgement message when a switch detect time is received from one of:

the source BTS and the at least one target BTS.

5. The method according to claim 1 further comprising receiving information pertaining to at least one non-transmitted payload data unit (PDU) from the source BTS.

6. The method according to claim 5, wherein the non-transmitted PDU is a PDU in queue to be transmitted using a Forward-Packet Data Channel of the mobile network.

7. The method according to claim 1 further comprising transmitting a switch transmission message to the source BTS and the target BTS, the switch transmission message comprising the switch time.

8. The method according to claim 1, wherein switching the mobile device comprises:

discontinuing transmission of PDUs from the source BTS; and

beginning transmission of the PDUs from the target BTS.

9. The method according to claim 8, wherein beginning transmission of the PDUs from the target BTS comprises transmitting a first non-scheduled PDU from the target BTS.

10. The method according to claim 8, wherein switching the mobile device comprises transmitting real time PDUs continuously during the switch time.

11. The method according to claim 10, wherein discontinuing transmission of the PDUs comprises discontinuing transmission of non-real time PDUs, and wherein beginning transmission of the PDUs comprises beginning transmission of non-real time PDUs.

12. The method according to claim 1, wherein switching the mobile device comprises handing over transmission of PDUs from the source BTS to the target BTS at the end of the switch time.

13. The method of claim 1, wherein the source coded BTS identifier is at least one of a source walsh cover of a Reverse Channel Quality Indicator Channel (R-CQICH) and a source cell cover on a DSC channel.

14. The method of claim 1, wherein the target coded BTS identifier is at least one of a target walsh cover of a Reverse Channel Quality Indicator Channel (R-CQICH) and a target cell cover on a DSC channel.

15. A method for switching a mobile device from a source Base Transceiver Station (BTS) to a target BTS in a mobile network, the mobile network enabling communication between a plurality of mobile devices, the method comprising:

detecting a cell switch intention for the mobile device, wherein the cell switch intention is detected by the source BTS and at least one target BTS;

receiving a switch detect time from the source BTS and the at least one target BTS;

receiving a source coded BTS identifier and at least one target coded BTS identifier from the at least one target BTS and the source BTS respectively;

determining a switch time based on the switch detect time;

transmitting a switch transmission message to the source BTS and the target BTS, the switch transmission message comprising the switch time; and

switching the mobile device from the source BTS to the target BTS based on the switch time.

16. The method according to claim 15 further comprising sending an acknowledgment message to the source BTS and the at least one target BTS on receiving the switch detect time.

17. The method according to claim 15, wherein switching the mobile device comprises:

discontinuing transmission of PDUs from the source BTS; and

beginning the transmission of the PDUs from the target BTS.

18. The method according to claim 17, wherein beginning transmission of the PDUs from the target BTS comprises transmitting a first non-scheduled PDU from the target BTS.

19. The method according to claim 17, wherein switching the mobile device comprises transmitting real time PDUs continuously during the switch time.

20. The method according to claim 19, wherein discontinuing transmission of the PDUs comprises discontinuing transmission of non-real time PDUs, and wherein beginning transmission of the PDUs comprises beginning transmission of non-real time PDUs.

21. The method according to claim 15, wherein switching the mobile device comprises handing over transmission of PDUs from the source BTS to the target BTS at the end of the switch time.