公开(公告)号：US20080117874A1

公开(公告)日：2008-05-22

申请号：US11576832

申请日：2005-01-05

Applicant: Seong-Soo Park ,  Dong-Hahk Lee

Inventor： Seong-Soo Park ,  Dong-Hahk Lee

IPC: H04Q7/00

CPC classification number: H04W36/14 ,  H04W36/0011

Abstract: In the data call handover method, the mobile communication terminal registers a Mobile Internet Protocol (MIP address) through an asynchronous mobile communication network and receives data call service when a data call connection event is initiated by the mobile communication terminal. It is determined whether the mobile communication terminal has entered an area in which the asynchronous mobile communication network and a synchronous mobile communication network overlap. If the mobile communication terminal has entered the overlap area, it is determined whether to perform handover to the synchronous mobile communication network based on the intensity of a signal of the asynchronous mobile communication network. If handover is to be performed, a data call between the mobile communication terminal and the synchronous mobile communication network is established and the MIP address is registered. The service of the data call, which is provided by the asynchronous mobile communication network, is linked with the service of the synchronous mobile communication network. The data call between the mobile communication terminal and the asynchronous mobile communication network is released

Abstract translation: 在数据呼叫切换方法中，移动通信终端通过异步移动通信网络注册移动因特网协议（MIP地址），并且在移动通信终端发起数据呼叫连接事件时接收数据呼叫业务。 确定移动通信终端是否进入异步移动通信网络和同步移动通信网络重叠的区域。 如果移动通信终端已经进入重叠区域，则基于异步移动通信网络的信号的强度来确定是否对同步移动通信网络进行切换。 如果要执行切换，则建立移动通信终端与同步移动通信网络之间的数据呼叫，并登记MIP地址。 由异步移动通信网络提供的数据呼叫的服务与同步移动通信网络的服务相关联。 移动通信终端与异步移动通信网络之间的数据呼叫被释放

公开(公告)号：US20060013170A1

公开(公告)日：2006-01-19

申请号：US10512791

申请日：2002-11-29

Applicant: Yong-Sik Shin ,  Si-Hoon Ryu ,  Dong-Hahk Lee

Inventor： Yong-Sik Shin ,  Si-Hoon Ryu ,  Dong-Hahk Lee

IPC: H04Q7/24

CPC classification number: H04W8/12 ,  H04L29/06 ,  H04W80/04 ,  H04W88/005

Abstract: The present invention relates to a roaming method between a WLAN and a cellular network which can interwork the WLAN and the cellular network on the basis of a mobile IP system for smooth roaming. In data communication in the WLAN and/or the cellular network using the mobile IP system, the roaming method between the WLAN and the cellular network includes a step wherein a packet data serving node of the cellular network which recognizes allocation of an IP address to a specific mobile terminal notifies information on a current access state of the mobile terminal to an access point managing means of the WLAN located in a current service area of the mobile terminal, a step wherein the access point managing means which the mobile terminal newly accesses requests address renewal to replace an address of the packet data serving node by its address, allocates an IP address to the mobile terminal according to the renewal result, and notifies it to the packet data serving node, and a step wherein the packet data serving node which receives the notification message from the access point managing means transmits data obtained during the roaming due to the movement to the access point managing node, whereby the roaming is performed from the cellular network to the WLAN. In the same manner, the roaming can be performed from the WLAN to the cellular network.