Method, apparatus and computer program providing high-speed downlink packet access (HSDPA) cell change without RRC acknowledgment
First Claim
1. A wireless communication system comprising a serving cell and a target cell for handing over a mobile terminal, wherein:
- the serving cell comprises a processor, a memory for storing a first set of instructions, a transceiver and an antenna that are together configured to wirelessly send a message to the mobile terminal that includes information needed to receive a shared control channel of the target cell; and
the target cell comprises a processor, a memory for storing a second set of instructions, a transceiver and an antenna that are together configured to schedule a data packet for transmission to the mobile terminal, to wirelessly send an identification of the mobile terminal over the shared control channel at a time defined by the information, and to wirelessly send the data packet to the mobile terminal over a shared data channel.
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0 Petitions
Accused Products
Abstract
Handing over a mobile terminal MT from a serving base station BS to a target BS employs a handover window HW during which the MT monitors a shared control channel of the target BS. The network determines whether to handover based on a MT measurement report. Once handover is determined, the serving BS sends over its shared data channel to the MT information about the target BS'"'"'s shared control channel and a HW during which to monitor. The serving BS restricts transmissions to the MT to avoid the HW, which recurs in fixed intervals. The MT monitors the target BS'"'"'s control channel during HWs, and the target BS sends the MT its identification in an HW, followed by data for the MT on the target BS'"'"'s shared data channel. A handover confirmation message is then sent by the MT to the target BS, or by the target BS to an RNC.
58 Citations
25 Claims
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1. A wireless communication system comprising a serving cell and a target cell for handing over a mobile terminal, wherein:
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the serving cell comprises a processor, a memory for storing a first set of instructions, a transceiver and an antenna that are together configured to wirelessly send a message to the mobile terminal that includes information needed to receive a shared control channel of the target cell; and
the target cell comprises a processor, a memory for storing a second set of instructions, a transceiver and an antenna that are together configured to schedule a data packet for transmission to the mobile terminal, to wirelessly send an identification of the mobile terminal over the shared control channel at a time defined by the information, and to wirelessly send the data packet to the mobile terminal over a shared data channel. - View Dependent Claims (2, 4)
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3. A method comprising:
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receiving, over a first shared channel from a serving base transceiver station, channel information about a second shared channel of a target base transceiver station and a handover window;
using the received channel information, monitoring the second shared channel during the handover window of each of at least two fixed time intervals. - View Dependent Claims (5, 6, 7, 8)
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9. A mobile terminal comprising:
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a transceiver;
a processor coupled to the transceiver; and
a memory coupled to the processor for storing a set of instructions, executable by the processor, for determining from a first message received at the transceiver over a first channel a second channel to monitor and a handover window during which to monitor, and for tuning the transceiver to monitor the second channel during the handover window in each of at least two fixed time intervals. - View Dependent Claims (10, 11)
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12. A program of machine-readable instructions, tangibly embodied on an information bearing medium and executable by a digital data processor, to perform actions directed toward handing over a mobile terminal between network elements, the actions comprising:
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determining from a message, wirelessly received over a first shared channel from a serving base transceiver station, channel information about a second shared channel of a target base transceiver station and a handover window;
using the received channel information, configuring a transceiver to monitor the second shared channel during the handover window of each of at least two fixed time intervals. - View Dependent Claims (13, 14)
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15. A method comprising:
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transmitting, from a serving base transceiver station to a mobile terminal over a first shared channel, channel information about a second shared channel of a target base transceiver station and a handover window; and
restricting all transmissions from the serving base transceiver station to the mobile terminal so as to avoid the handover window of each of at least two fixed time intervals subsequent to the transmitting. - View Dependent Claims (16, 17)
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18. A network element comprising:
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a transceiver;
a processor coupled to the transceiver; and
a memory coupled to the processor for storing a set of instructions, executable by the processor, for;
compiling a first message comprising information about a second channel and a handover window during which to monitor the second channel;
configuring the transceiver to send the first message over a first channel to a mobile terminal; and
restricting transmissions from the network element to the mobile terminal so as to avoid the handover window in each of at least two fixed intervals subsequent to sending the first message. - View Dependent Claims (19)
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20. A program of machine-readable instructions, tangibly embodied on an information bearing medium and executable by a digital data processor, to perform actions directed toward handing over a mobile terminal between network elements, the actions comprising:
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transmitting, from a serving base transceiver station to a mobile terminal over a first shared channel, channel information about a second shared channel of a target base transceiver station and a handover window; and
restricting all transmissions from the serving base transceiver station to the mobile terminal so as to avoid the handover window of at least two fixed time intervals subsequent to the transmitting. - View Dependent Claims (21)
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22. A method for operating a network element comprising:
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during a predefined handover window, sending over a shared control channel a transmission directed to an individual mobile terminal that is not under the control of a network element sending the transmission;
following sending over the shared control channel, sending over a shared data channel a transmission directed to the individual mobile terminal;
confirming that communication with the mobile terminal over the shared data channel is established; and
responsive to confirming that communications with the mobile terminal is established, sending a handover confirmation message to a radio network controller.
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23. A method for downlink packet data transmission within UTRAN using HSDPA, comprising:
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initiating at a terminal a measurement report in the uplink direction that indicates a change of a best cell from a serving cell to a target cell for high-speed data packet access HSDPA;
listening at the terminal to a high speed shared control channel HS-SCCH of the target cell during at least one predefined time instant, where the time instant is relative to the measurement report sent in the uplink direction;
wherein the terminal does not need to listen to a HS-SCCH of both the serving cell and of the target cell at any given time during the change to the target cell. - View Dependent Claims (24, 25)
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Specification