Patent ID: 9288668
Filing Date: 2016-03-15
CPC Classification: H04L,H04W

Claim Text:
1. A method of allocating an Internet protocol (IP) address in a mobile communication system, the method comprising: receiving a packet data network (PDN) connection request message from a user equipment (UE), the PDN connection request message including one or more of version information indicating a requested IP version and information regarding capability of the UE; obtaining subscriber information of the UE from a subscriber information server in response to reception of the PDN connection request message; checking the IP version information included in the PDN connection request message; when an address of IP version 6 (IPv6) is requested according to the checking of the version information, determining whether or not the UE moves frequently or is stationary on the basis of one or more of the subscriber information of the UE, the capability information of the UE, and a tracking area update (TAU) frequency; and when the UE is stationary, transmitting to the UE a request message including particular indication information indicating to maintain router information, although a timer with respect to the router information has expired, as long as the UE belongs to a particular PDN gateway, and information corresponding to an interface identity (ID) allocated for the UE, wherein the interface ID is used to configure the address of IPv6 for the UE, wherein the particular indication message is composed of 1 bit, when a value of the particular indication message is 0, the UE is configured to be updated by receiving a router advertisement message including a router lifetime value, and when the value of the particular indication message is 1, the UE is configured to use the router information until a connection with the particular PDN gateway is released.