The method of accessing a packet data network, the apparatus and system

Embodiment of the present invention discloses a method and apparatus for accessing a packet data network, to a network technology, the prior art to solve the SGSN can not determine the UE is a PDN accessed directly through HNB / HeNB or through GGSN / PDN GW network access PDN the problem of the invention. Method for accessing a packet data network according to an embodiment of the present invention, comprising: obtaining access information; according to the access information, select the NE Gi / SGi interface, a packet data network access. According to the present invention enables the UE may select either the HeNB by HNB / information exchange directly with the PDN network, may choose to perform information interaction through the GGSN / PDN GW and the PDN.