Patent ID: 8792390

Claim:
A method for a user equipment (UE) to acquire Packet Data Network (PDN) address capability information in a network, comprising: sending, by the UE, a first request to a network equipment for acquiring an Internet Protocol (IP) address in a PDN connection, wherein the first request comprises information of IP address version(s) supported by the UE; receiving, by the UE, PDN address capability determined by the network equipment according to the information of IP address version(s) supported by the UE, wherein the PDN address capability comprises IP address version(s) available to the UE and allowed by the network in the PDN connection; according to the received PDN address capability, determining, by the UE, whether there is remaining IP address version(s) available to the UE and allowed by the network in the PDN connection; and if there is remaining IP address version(s) available to the UE and allowed by the network in the PDN connection, determining, by the UE, whether to initiate a second request for acquiring an IP address, or if there is no remaining IP address version(s) available to the UE and allowed by the network in the PDN connection, deciding, by the UE, not to initiate the second request for acquiring an IP address; wherein the IP address version(s) available to the UE and allowed by the network in the PDN connection comprises: all IP address version(s) available to the UE and allowed by the network in the PDN connection; or remaining IP address version(s) available to the UE and allowed by the network in the PDN connection.