Method, device and system for accessing a network packet data

摘要

A method for accessing a data network in packets, PDN, comprising: obtaining (201) by a network element of mobility management, MMNE, access information; characterized in that the method further comprises: selecting (202), by the MMNE element, a network element, NE, home access, in order to access the PDN through an interface Gi / SGi depending on the access information; wherein the access information comprises information about the capabilities of a home access NE element communicating through the Gi / SGi interface; and selecting, by the MMNE element, NE element to access the PDN through the Gi / SGi interface based on the access information, comprising: in the case of determining that the NE home access element capable of communicating through the Gi / SGi interface sending, by the MMNE, a message Request Creation Support NE home access element, so that the NE element home access is connected with the PDN through the Gi / SGi interface NE home access element.