Samsung Electronics Co., Ltd.

Hye-Won Baek

Heung-Chul Jung

Ji-Cheol Lee

Sung-Won Lee

Sang-Jun Moon

Dong-Keon Kong

Sang-Do Lee

Jae-Woo Kwon

Eun-Young Chung

Jong-Bum Pyo

Provided are an apparatus and method for providing VoIP service based on an IP multimedia subsystem (IMS). When a MS is located indoors, it accesses the IMS through a VoIP gateway. When the MS is located outdoors, it accesses the IMS through an IEEE 802.16 system. Therefore, the VoIP service can be provided over one telephone number allocated to the MS.

Apparatus and method for providing VoIP service based on IP multimedia subsystem

A method of providing Location Services (LCS) over an Internet Protocol Multimedia Subsystem (IMS) network in a wireless communication system is provided. An LCS client transmits a service connection request message including a message requesting the location information of a User Equipment (UE). The UE transmits the location information to the LCS client.

Method of providing location service over IMS network

A method for performing a handoff between a wireless local area network (LAN) including an access router (AR) supporting an Internet protocol (IP) routing function and a mobile communication network including a packet data service node (PDSN) connected to a base station system (BSS), for supporting the IP routing function. An access terminal (AT) detects its movement from the wireless LAN to the mobile communication network, and exchanges information for tunneling between the AR and the PDSN, with the PDSN. The PDSN sets up a tunnel for packet delivery between the PDSN and the AR, and delivers packets to the AT through the set tunnel.

Handoff system and method between a wireless LAN and mobile communication network

Growing community of inventors

Seongnam-si, South Korea

Hye-Won Baek