Method for establishing a data connection on a mobile network and a network gateway packet data

A method for establishing data connections in a mobile network, wherein a data channel between a user equipment, UE, and a network packet data, PDN, gateway GW is established; and a session control policy between a control entity policy and PDN GW according to a channel ID data provided by the PDN GW to the control entity policy is set, the method comprising: assigning (402, 403), by PDN GW, an IP address of Internet Protocol, to access the PDN the UE according to an allocation request address sent from the UE; characterized by sending (404) by PDN GW, an update request session control policy carrying the IP address assigned and the data channel ID to the policy control entity; receiving (405) by PDN GW, from the entity control policy rule policy control corresponding to the control session updated policy, where a control rule corresponding policy to control session is updated policy by the policy control entity, according to the IP address assigned to the update request policy control session.