Control Method, System, and Device for Circuit Domain Fallback

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A method for controlling Circuit Switched fallback, CS fallback, which is used in scenarios that a calling User Equipment, UE, initiates a call to a called UE, wherein the called UE is in an Evolved Packet domain System, EPS, network, the method comprises:

• Mobile Switching Center/Visitor Location Register, MSC/VLR, notifying Mobility Management Entity, MME, of the calling information;
• the MME determining whether the call performs CS fallback according to pre-configured CS fallback policy;
• the MME sending, to the called UE, the calling information and indication information of whether the present call performs CS fallback.

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An apparatus for controlling Circuit Switched fallback, CS fallback, which is used in scenarios that a calling User Equipment, UE, initiates a call to a called UE, wherein the called UE is in an Evolved Packet domain System, EPS, network, the apparatus comprises:

• a forwarding module, configured to notify a Mobility Management Entity, MME, of calling information of the present call, and forward the calling information from the MME to the called UE;
• a CS fallback decision-making module in which a CS fallback policy is set, configured to determine whether the call performs CS fallback according to the CS fallback policy or according to whether the user of the called UE answers the call;
• a CS fallback executing module, configured to execute CS fallback according to the decision of the CS fallback decision-making module.

(canceled)

A system for controlling Circuit Switched fallback, CS fallback, which is used in scenarios that a calling User Equipment, UE, initiates a call to a called UE, wherein the called UE is in an Evolved Packet domain System, EPS, network, the system comprises:

• a Mobile Switching Center/Visitor Location Register, MSC/VLR, configured to notify a Mobility Management Entity, MME, of the calling information;
• the MME, configured to notify the called UE of the calling information;
• the called UE, configured to determine whether the call performs CS fallback according to whether the user answers the call or according to pre-configured CS fallback policy.

A system for controlling Circuit Switched fallback, CS fallback, which is used in scenarios that a calling User Equipment, UE, initiates a call to a called UE, wherein the called UE is in an Evolved Packet domain System, EPS, network, the system comprises:

• a Mobile Switching Center/Visitor Location Register, MSC/VLR, configured to notify a Mobility Management Entity, MME, of the calling information;
• the MME, configured to determine whether the call performs CS fallback according to pre-configured CS fallback policy, and to send, to the called UE, the calling information and indication information of whether the present call performs CS fallback.