Method for switching session of user equipment in wireless communication system and system employing the same
First Claim
1. A method for switching a session of a User Equipment (UE) by a Mobility Management Entity (MME) in a wireless communication system, the method comprising:
- if the UE performs a handover from a macro base station of a macro cell to a femto base station of a femto cell, receiving a path switch request message, which includes a serving gateway relocation Information Element (IE) for requesting a switching from an existing session of the UE to a new session managed by the femto base station, from the femto base station; and
switching the existing session of the UE to the new session;
if a packet data network connectivity request message has been received from the UE after completing the handover, generating context information of the UE for the new session, the context information including an Internet Protocol (IP) address of the femto serving gateway detected from the serving gateway relocation IE; and
transmitting a path switch approval message and the context information to the femto base station,wherein the serving gateway relocation IE comprises information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell.
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Abstract
A system and method for switching a session of a User Equipment (UE) in a wireless communication system are provided. According to the method, if the UE performs a handover from a macro base station of a macro cell to a femto base station of a femto cell, a femto base station transmits a path switch request message, which includes a serving gateway relocation Information Element (IE), to a Mobility Management Entity (MME) of the macro cell, in order to request a switching from an existing session of the UE to a new session managed by the femto base station. Then, in response to the path switch request message, the MME switches the existing session of the UE to the new session and transmits a path switch approval message to the femto base station. The serving gateway relocation IE includes information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell.
14 Citations
21 Claims
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1. A method for switching a session of a User Equipment (UE) by a Mobility Management Entity (MME) in a wireless communication system, the method comprising:
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if the UE performs a handover from a macro base station of a macro cell to a femto base station of a femto cell, receiving a path switch request message, which includes a serving gateway relocation Information Element (IE) for requesting a switching from an existing session of the UE to a new session managed by the femto base station, from the femto base station; and switching the existing session of the UE to the new session; if a packet data network connectivity request message has been received from the UE after completing the handover, generating context information of the UE for the new session, the context information including an Internet Protocol (IP) address of the femto serving gateway detected from the serving gateway relocation IE; and transmitting a path switch approval message and the context information to the femto base station, wherein the serving gateway relocation IE comprises information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for switching a session of a User Equipment (UE) by a femto base station of a femto cell in a wireless communication system, the method comprising:
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if the UE performs a handover from a macro base station of a macro cell to the femto base station, transmitting a path switch request message, which includes a serving gateway relocation Information Element (IE), to a Mobility Management Entity (MME) of the macro cell, in order to request a switching from an existing session of the UE to a new session managed by the femto base station; and if the existing session of the UE is switched to the new session in response to the path switch request message, receiving a path switch approval message and context information of the UE for the new session from the MME, the context information including an Internet Protocol (IP) address of the femto serving gateway detected from the serving gateway relocation IE, wherein the serving gateway relocation IE comprises information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell. - View Dependent Claims (8, 9, 10)
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11. A Mobility Management Entity (MME) for switching a session of a User Equipment (UE), the MME comprising:
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a receiver for, if the UE performs a handover from a macro base station to a femto base station, receiving a path switch request message, which includes a serving gateway relocation Information Element (IE) for requesting a switching from an existing session of the UE to a new session managed by the femto base station, from the femto base station; a controller for switching the existing session of the UE to the new session and, if a packet data network connectivity request message has been received from the UE after completing the handover, generating context information of the UE for the new session, the context information including an Internet Protocol (IP) address of the femto serving gateway detected from the serving gateway relocation IE; and a transmitter for transmitting a path switch approval message and the context information to the femto base station, wherein the serving gateway relocation IE comprises information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A femto base station for switching a session of a User Equipment (UE), the femto base station comprising:
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a transmitter for, if the UE performs a handover from a macro base station of the macro cell to the femto base station of a femto cell, transmitting a path switch request message, which includes a serving gateway relocation Information Element (IE), to a Mobility Management Entity (MME), in order to request a switching from an existing session of the UE to a new session managed by the femto base station; and a receiver for, if the existing session of the UE is switched to the new session in response to the path switch request message, receiving a path switch approval message and context information of the UE for the new session from the MME, the context information including an Internet Protocol (IP) address of the femto serving gateway detected from the serving gateway relocation IE, wherein the serving gateway relocation IE comprises information requesting relocation of a serving gateway of the UE to a femto serving gateway within the femto cell. - View Dependent Claims (19, 20, 21)
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Specification