Method for triggering data offload, network-side device, user equipment, and network system

A method for triggering data offload, comprising:

• obtaining, by a user equipment (UE), offload capability information of the UE;
• and
• reporting the offload capability information to a network side, so that a network element on the network side triggers, according to offload indication information delivered by a home subscriber server (HSS) and the offload capability information, offloading of a data flow associated with a PDN connection that is established by the UE through a second network access network to a first access network.

A network-side device, comprising a processor and a non-transitory process-readable medium having processor-executable instructions stored thereon, the processor-executable instructions comprising a plurality of units, the units comprising:

• a receiving unit, configured to receive, from an home subscriber server (HSS), information of a packet data network (PDN) connection that is established by a user equipment (UE) through a second access network, wherein the information of the PDN connection comprises offload indication information;
• an offload triggering unit, configured to trigger, according to the offload indication information offloading a data flow associated with the PDN connection to a first access network.

A user equipment, comprising a processor and a non-transitory process-readable medium having processor-executable instructions stored thereon, the processor-executable instructions comprising a plurality of units, the units comprising:

• an obtaining unit, configured to obtain offload capability information of the user equipment;
• and
• a reporting unit, configured to report the offload capability information to a network side, so that a network element on the network side is able to trigger, according to offload indication information delivered by a home subscriber server (HSS) and the offload capability information, offloading of a data flow associated with a packet data network (PDN) connection that is established by the UE through a second access network to a first access network.