公开(公告)号：US20050025164A1

公开(公告)日：2005-02-03

申请号：US10712954

申请日：2003-11-14

Applicant: Alan Kavanagh ,  Suresh Krishnan

Inventor： Alan Kavanagh ,  Suresh Krishnan

IPC: H04L12/28 ,  H04W36/14 ,  H04W36/18 ,  H04L12/56

CPC classification number: H04W36/0033 ,  H04W36/14 ,  H04W36/18

Abstract: A method and system for seamlessly handing off a Mobile Node (MN) equipped with a Wireless Local Area Network (WLAN) adaptor from a cellular network such as a GRPS/UMTS network to a WLAN network without interrupting the ongoing IP connection/session. When entering a WLAN coverage area, the roaming MN sends mobility information to a WLAN Integration Gateway (WIG) node allowing the WIG node to identify the source Service GPRS Support Node (SGSN). The WIG node contacts the source SGSN to obtain PDP Context information relative to the roaming MN, and establishes a new GTP tunnel with the servicing GGSN in order to complete the handoff. The WIG node may route data traffic for the MN by assigning a new IP address to the MN and by either performing IP-in-IP encapsulation or Network Address Translation (NAT).

Abstract translation: 一种用于将配备有无线局域网（WLAN）适配器的移动节点（MN）从诸如GRPS / UMTS网络的蜂窝网络无缝地切换到WLAN网络的方法和系统，而不中断正在进行的IP连接/会话。 当进入WLAN覆盖区域时，漫游MN向WLAN集成网关（WIG）节点发送移动性信息，允许WIG节点识别源服务GPRS支持节点（SGSN）。 WIG节点与源SGSN联系，获得相对于漫游MN的PDP上下文信息，并建立具有维护GGSN的新GTP隧道，以完成切换。 WIG节点可以通过向MN分配新的IP地址以及通过执行IP-in-IP封装或网络地址转换（NAT）来路由MN的数据业务。