Method and base station controller for handover of simultaneous voice and data sessions
First Claim
1. A method of reestablishing a packet data session when a mobile station, conducting both a circuit-switched call and a packet data session, is handed over from a serving base transceiver station (BTS) to a target BTS served by the same base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system, said method comprising:
- determining by the BSC that a handover of the mobile station from the serving BTS to the target BTS is imminent;
sending from the BSC to the mobile station prior to a handover command, information needed by the mobile station to resume the packet data session in the target cell;
handing over the mobile station from the serving BTS to the target BTS;
reconnecting the circuit-switched call; and
reestablishing the packet data session utilizing the information sent to the mobile station prior to the handover command.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station (MS) conducting both a circuit-switched call and a packet data session, and for rapidly reestablishing the packet data session. The BSC determines from measurement reports that a handover of the MS is imminent. The BSC sends both packet system information and Dual Transfer Mode (DTM) information relevant in the target cell to the MS prior to a handover command. When the handover is complete, the BSC may also send a pseudo cell update message to a serving SGSN. The message includes an identifier of the MS and appears to the SGSN to be from the MS. After the circuit-switched call is reconnected, the packet data session is rapidly reestablished utilizing the information sent to the mobile station prior to the handover command, and without having to send a cell update message from the MS.
51 Citations
36 Claims
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1. A method of reestablishing a packet data session when a mobile station, conducting both a circuit-switched call and a packet data session, is handed over from a serving base transceiver station (BTS) to a target BTS served by the same base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system, said method comprising:
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determining by the BSC that a handover of the mobile station from the serving BTS to the target BTS is imminent;
sending from the BSC to the mobile station prior to a handover command, information needed by the mobile station to resume the packet data session in the target cell;
handing over the mobile station from the serving BTS to the target BTS;
reconnecting the circuit-switched call; and
reestablishing the packet data session utilizing the information sent to the mobile station prior to the handover command. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station from a serving base transceiver station (BTS) to a target BTS served by the BSC, wherein the mobile station is conducting both a circuit-switched call and a packet data session, said BSC comprising:
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means for determining that a handover of the mobile station from the serving BTS to the target BTS is imminent;
communication means for sending from the BSC to the mobile station prior to a handover command, information needed by the mobile station to resume the packet data session in the target cell;
channel activation and release means for handing over the mobile station from the serving BTS to the target BTS; and
means for reestablishing the packet data session after the circuit-switched call is reconnected, utilizing the information sent to the mobile station prior to the handover command. - View Dependent Claims (9, 10, 11, 12)
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13. A method of reestablishing a packet data session when a mobile station, conducting both a circuit-switched call through a mobile switching center (MSC) and a packet data session through a serving GPRS service node (SGSN), is handed over from a serving base transceiver station (BTS) to a target BTS served by the same base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system, said method comprising:
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determining by the BSC that a handover of the mobile station from the serving BTS to the target BTS is imminent;
sending from the BSC to the mobile station prior to a handover command, information needed by the mobile station to resume the packet data session in the target cell;
handing over the mobile station from the serving BTS to the target BTS;
sending from the BSC to the SGSN, a pseudo cell update message when the handover is complete, said pseudo cell update message including an identifier of the mobile station and appearing to the SGSN to be a cell update message from the mobile station;
reconnecting the circuit-switched call; and
reestablishing the packet data session utilizing the information sent to the mobile station prior to the handover command. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station from a serving base transceiver station (BTS) to a target BTS served by the BSC, wherein the mobile station is conducting both a circuit-switched call through a mobile switching center (MSC) and a packet data session through a serving GPRS service node (SGSN), said BSC comprising:
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means for determining that a handover of the mobile station from the serving BTS to the target BTS is imminent;
first communication means for sending from the BSC to the mobile station prior to a handover command, information needed by the mobile station to resume the packet data session in the target cell;
channel activation and release means for handing over the mobile station from the serving BTS to the target BTS;
second communication means for sending from the BSC to the SGSN when the handover is complete, a pseudo cell update message, said pseudo cell update message including an identifier of the mobile station and appearing to the SGSN to be a cell update message from the mobile station; and
means for reestablishing the packet data session utilizing the information sent to the mobile station prior to the handover command. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A mobile station for conducting both a circuit-switched call through a mobile switching center (MSC) and a packet data session through a serving GPRS service node (SGSN) in a GPRS/EDGE cellular radio telecommunication system, said cellular radio telecommunication system including a base station controller (BSC) for controlling a handover of the mobile station from a serving base transceiver station (BTS) to a target BTS serving a target cell, said mobile station comprising:
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communication means for receiving from the BSC when the handover is imminent, information needed by the mobile station to resume the packet data session in the target cell, and then receiving a handover command;
means responsive to the handover command, for executing the handover from the serving BTS to the target BTS;
means for reestablishing the circuit-switched call following the handover; and
means responsive to reestablishment of the circuit-switched call, for reestablishing the packet data session utilizing the information sent to the mobile station prior to the handover command. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification