Intra-rat handover for next generation system
AssigneeSamsung Electronics Co., Ltd.
InventorJayshree A. Bharatia
Life of this patent
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Abstract
A method of an access and mobility function (AMF) for state management in a wireless communication system is provided. The method comprises determining a state of at least one state machine, receiving, from a target access network (AN), an N2 path switch request message based on the state of the at least one state machine, transmitting, to a session management function (SMF), an N11 message, and transmitting, to the target AN, an N2 path switch request acknowledgement (Ack) message when receiving an N11 Ack message, from the SMF, corresponding to the N11 message, wherein the target AN transmits a release resource message to a source AN when the target AN receives the N2 path switch request Ack message.
Claims14
A method of operating a session management function (SMF) entity in a wireless communication system, the method comprising:
- receiving, from an access and mobility management function (AMF), an N11 message including a list of bearers to be switched;
- determining whether a source user plane function (UPF) entity can continue to serve a user equipment (UE) based on the N11 message;
- selecting a target UPF based on UPF selection criteria, in case that the source UPF entity cannot continue to serve the UE;
- allocating tunnel information associated with an uplink (UL) and tunnel information associated with a downlink (DL);
- transmitting, to the target UPF, an N4 session establishment request message including the tunnel information associated with the UL and the tunnel information associated with the DL;
- and
- transmitting, to the AMF, an N11 acknowledge (ACK) message based on the N11 message, the N11 ACK message including the tunnel information associated with the UL.
A method of operating an access and mobility management function (AMF) entity in a wireless communication system, the method comprising:
- transmitting, to a session management function (SMF), an N11 message including a list of bearers to be switched;
- in response to the SMF determining that a source user plane function cannot continue to serve a user equipment (UE) based on the N11 message and selecting a target UPF based on UPF selection criteria, receiving, from the SMF, an N4 session establishment request message including tunnel information associated with an uplink (UL) and tunnel information associated with a downlink (DL);
- and
- receiving, from the SMF, an N11 acknowledge (ACK) message including the tunnel information associated with the UL.
An apparatus for a session management function (SMF) in a wireless communication system, the apparatus comprising:
- a network node configured to:
- receive, from an access and mobility management function (AMF), an N11 message including a list of bearers to be switched,
- determine whether a source user plane function (UPF) entity can continue to serve a user equipment (UE) based on the N11 message,
- select a target UPF entity based on UPF selection criteria, in case that the source UPF entity cannot continue to serve the UE,
- allocate tunnel information associated with an uplink (UL) and tunnel information associated with a downlink (DL),
- transmit, to the target UPF, an N4 session establishment request message including the tunnel information associated with the UL and the tunnel information associated with the DL, and
- transmit, to the AMF, an N11 acknowledge (ACK) message based on the N11 message, the N11 ACK message including the tunnel information associated with the UL.
An apparatus for an access and mobility management function (AMF) entity in a wireless communication system, the apparatus comprising:
- network node configured to:
- transmit, to a session management function (SMF), an N11 message including a list of bearers to be switched
- in response to the SMF determining that a source user plane function cannot continue to serve a user equipment (UE) based on the N11 message and selecting a target UPF based on UPF selection criteria, receive, from the SMF, an N4 session establishment request message including tunnel information associated with an uplink (UL) and tunnel information associated with a downlink (DL), and
- receive, from the SMF, an N11 acknowledge (ACK) message including the tunnel information associated with the UL.
Dependencies are inferred from the claim text.