Method for data transmission, offload point device, user equipment and system

A method for data transmission, comprising:

• receiving, by a user equipment, a first message sent by an offload point device when a first air interface is unavailable, wherein the first message carries updating information related to connection context information corresponding to service(s) of the user equipment on the first air interface that is updated by the offload point device when the first air interface is unavailable, and the user equipment is connected to a core network through a first access network via the first air interface;
• updating, by the user equipment, according to the updating information, connection context information corresponding to the service(s) on the first air interface;
• and
• performing, by the user equipment, data transmission with the offload point device according to the updated connection context information.

An offload point device, comprising a non-transitory storage medium comprising:

• an updating module, configured to update, when a first air interface is unavailable, connection context information corresponding to service(s) of a user equipment on the first air interface, wherein the user equipment is connected to a core network through a first access network via the first air interface;
• a sending module, configured to send a first message to the user equipment, wherein the first message carries updating information related to the updated connection context information, such that the user equipment updates connection context information corresponding to the service(s) on the first air interface according to the updating information so as to obtain the updated connection context information;
• and
• a transmitting module, configured to perform data transmission with the user equipment according to the updated connection context information.

A user equipment, comprising a non-transitory storage medium comprising:

• a receiving module, configured to receive a first message sent by an offload point device when a first air interface is unavailable, wherein the first message carries updating information related to connection context information corresponding to service(s) of the user equipment on the first air interface that is updated by the offload point device when the first air interface is unavailable, and the user equipment is connected to a core network through a first access network via the first air interface;
• an updating module, configured to update, according to the updating information, connection context information corresponding to the service(s) on the first air interface;
• and
• a transmitting module, configured to perform data transmission with the offload point device according to the updated connection context information.