Communications system, user equipment, mobility management entity and method thereof of transient handover for performing packet offloading

A method of a transient handover for performing packet offloading, used in a user equipment (UE) executing an application, wherein the UE attaches to a cellular network, the method comprising:

• receiving a handover-transient request from a mobility management entity (MME) in the cellular network;
• finding whether there is a wireless local area network;
• transmitting an access request to the wireless local area network when finding the wireless local area network;
• transmitting a handover-transient ACK to the MME when accessing the wireless local area network;
• and
• handed over from the cellular network to the wireless local area network by the MME.

A communications system of a transient handover for performing packet offloading, used in a cellular network, comprising:

• at least one qualified user equipment (UE), attaching to the cellular network and executing an application;
• and
• a mobility management entity (MME), coupled to the qualified UE, configured to find the qualified UE from UEs according to a determining method, and transmit a handover-transient request to the qualified UE,
• wherein the qualified UE finds and transmits an access request to a wireless local area network after receiving the handover-transient request;
• the qualified UE transmits a handover-transient ACK to the MME when accessing the wireless local area network;
• the MME releases a bearer resource of the qualified UE, retains bearer information of the qualified UE and hands over the qualified UE from the cellular network to the wireless local area network after receiving the handover-transient ACK.

A mobility management entity (MME), used in a cellular network, at least comprising:

• a control circuit;
• a processor installed in the control circuit;
• a memory installed in the control circuit and coupled to the processor;
• wherein the processor is configured to execute a program code stored in memory to execute a transient handover for performing packet offloading by:
• finding at least one qualified user equipment (UE) from a plurality of user equipment (UEs) according to a determining method and transmitting a handover-transient request to the qualified UE;
• and
• releasing a bearer resource of the qualified UE, retaining bearer information of the qualified UE, and handing over the qualified UE from the cellular network to a wireless local area network after receiving a handover-transient ACK transmitted from the qualified UE.

A user equipment (UE), used to execute an application and attached to a cellular network, comprising:

• a control circuit;
• a processor installed in the control circuit;
• a memory installed in the control circuit and coupled to the processor;
• wherein the processor is configured to execute a program code stored in memory to execute a transient handover for performing packet offloading by:
• receiving a handover-transient request from a mobility management entity (MME) in the cellular network;
• finding whether there is a wireless local area network;
• transmitting an access request to the wireless local area network when finding the wireless local area network;
• transmitting a handover-transient ACK to the MME when accessing the wireless local area network;
• and
• handing over from the cellular network to the wireless local area network by the MME.