Method and apparatus for supporting handover from LTE/EUTRAN to GPRS/GERAN
First Claim
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1. A dual mode wireless transmit/receive unit (WTRU) comprising:
- a receiver configured to receive global system for mobile (GSM)/enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) cell information while receiving wireless communications in a long term evolution (LTE)/evolved universal terrestrial radio access network (EUTRAN) cell;
a processor configured to receive list of available cells and their technologies in order to perform measurements on LTE frequencies and GERAN frequencies to be used for a handover from a source LTE cell to other wireless coverage areas, including a target GERAN cell using the GERAN cell information; and
a transmitter configured to send a measurement report of the measurements on the GERAN frequencies to a source evolved Node B (eNB).
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Abstract
A method and apparatus for handover of a dual mode wireless transmit/receive unit (WTRU) from an LTE system to a GERAN system uses measurements of the LTE and GERAN frequencies and a decision by a source evolved Node B to perform the handover. A GERAN access procedure includes PS attach messages exchanged between the WTRU and the target base station controller and a target SGSN. Alternatively, the GERAN access procedure uses RAN mobility information messages exchanged by the WTRU and the target base station controller and a relocation detect message by the source evolved Node B.
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Citations
16 Claims
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1. A dual mode wireless transmit/receive unit (WTRU) comprising:
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a receiver configured to receive global system for mobile (GSM)/enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) cell information while receiving wireless communications in a long term evolution (LTE)/evolved universal terrestrial radio access network (EUTRAN) cell; a processor configured to receive list of available cells and their technologies in order to perform measurements on LTE frequencies and GERAN frequencies to be used for a handover from a source LTE cell to other wireless coverage areas, including a target GERAN cell using the GERAN cell information; and a transmitter configured to send a measurement report of the measurements on the GERAN frequencies to a source evolved Node B (eNB). - View Dependent Claims (2, 3, 4, 5)
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6. An evolved Node B (eNB) comprising:
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a processor configured to make a decision for handover of a wireless transmit/receive unit (WTRU) from a source long term evolution (LTE) cell to a target GSM evolution radio access network (GERAN) cell; a transmitter, configured to communicate a handover request message to a source Mobility Management Entity (MME), the handover request message including a handover source identifier and an identifier of the target GERAN cell; and a receiver, configured to receive a handover command message from the source MME, the handover command message including radio aspect parameters relating to the target GERAN cell; wherein the transmitter is further configured to communicate the handover command message to the WTRU. - View Dependent Claims (7, 8)
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9. A method for handover of a dual mode wireless transmit/receive unit (WTRU) from a long term evolution (LTE) system cell to a global system for mobile (GSM)/enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) cell, the method comprising:
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receiving GERAN cell information while receiving wireless communications in a LTE cell; receiving a list of available cells and their technologies from the LTE system in order to perform measurements on LTE frequencies and GERAN frequencies to be used for a handover from a source LTE cell to other wireless coverage areas, including a target GERAN cell using the GERAN cell information; and sending a measurement report of the measurements on the GERAN frequencies to a source evolved Node B (eNB). - View Dependent Claims (10, 11, 12, 13)
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14. A method for use in an evolved Node B (eNB), the method comprising:
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performing a decision for handover of a wireless transmit/receive unit (WTRU) from a source long term evolution (LTE) cell to a target GSM evolution radio access network (GERAN) cell; communicating a handover request message to a source Mobility Management Entity (MME), the handover request message including a handover source identifier and an identifier of the target GERAN cell; receiving a handover command message from the source MME, the handover command message including radio aspect parameters relating to the target GERAN cell; and communicating the handover command message to the WTRU. - View Dependent Claims (15, 16)
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Specification