Network handover method, device, and system
AssigneeHuawei Technologies Co., Ltd.
InventorsXiaobo Wu, Hai Liu, Daliang Zhang
Life of this patent
Estimating the term…
Abstract
The present invention discloses a network handover method. After receiving a request message that requests circuit switched fallback (CSFB) and that is initiated by a UE located in an LTE network, an MME requests an MSC to hand over the UE from the LTE network to a CS domain of the 2G or 3G network; and after receiving a radio access bearer (RAB) sent by the MSC, the MME sends the RAB to the eNB, so that the RAB is sent by an eNB to the UE, where the RAB is a RAB whose domain identifier is a packet switched (PS) domain, or the RAB is a PS RAB. Therefore, the UE can be handed over to a PS domain of the 2G or 3G network in a manner of being handed over from the LTE network to the CS domain of the 2G or 3G network.
Claims20
A mobility management entity (MME), comprising:
- a memory storing instructions;
- and
- a processor coupled to the memory to execute the instructions to:
- receive a request message sent by user equipment (UE) located in a Long Term Evolution (LTE) network, wherein the request message is used to request circuit switched fallback (CSFB),
- send a first notification message to an evolved NodeB (eNB) according to the request message, wherein the first notification message is used to instruct the eNB to move the UE from the LTE network to a 2G or 3G network for the CSFB,
- receive a handover requirement message sent by the eNB,
- send a first handover request message to a mobile switching center (MSC), wherein the first handover request message is used to request the MSC to hand over the UE from the LTE network to a circuit switched (CS) domain of the 2G or 3G network for the CSFB,
- receive a first handover request response message sent by the MSC, wherein the first handover request response message comprises a radio access bearer (RAB), and the RAB is a RAB whose domain identifier is a packet switched (PS) domain, or the RAB is a PS RAB, and
- send a handover requirement response message to the eNB according to the first handover request response message, wherein the handover requirement response message comprises the RAB, so that the RAB is sent by the eNB to the UE.
A mobile switching center (MSC), comprising:
- a memory storing instructions;
- and
- a processor coupled to the memory to execute the instructions to:
- receive a first handover request message sent by a mobility management entity (MME), wherein the first handover request message is used to request the MSC to hand over user equipment (UE) from a Long Term Evolution (LTE) network to a circuit switched (CS) domain of a 2G or 3G network for circuit switched fallback (CSFB),
- send a second handover request message to a base station of the 2G or 3G network, wherein the second handover request message is used to request the base station to hand over the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB,
- receive a second handover request acknowledgement message sent by the base station, wherein the second handover request acknowledgement message comprises a radio access bearer (RAB), and the RAB is a RAB whose domain identifier is a packet switched (PS) domain, or the RAB is a PS RAB, and
- send a first handover request response message to the MME, wherein the first handover request response message comprises the RAB.
A base station for use in a 2G or 3G network, the base station comprising:
- a memory storing instructions;
- and
- a processor coupled to the memory to execute the instructions to:
- receive a second handover request message sent by a mobile switching center (MSC), wherein the second handover request message is used to request the base station to hand over user equipment (UE) from a Long Term Evolution (LTE) network to a circuit switched (CS) domain of the 2G or 3G network for circuit switched fallback (CSFB),
- send a second handover request acknowledgement message to the MSC, wherein the second handover request acknowledgement message comprises a radio access bearer (RAB), and the RAB is a RAB whose domain identifier is a packet switched (PS) domain, or the RAB is a PS RAB,
- receive a handover complete message sent by the UE, and
- send a second notification message to the UE, wherein the second notification message comprises a CS RAB allocated by the base station to the UE.
Dependencies are inferred from the claim text.