Electronics and Telecommunications Research Institute

Young Soo Shin

Ho Yong Ryu

Sun Cheul Kim

Sung Back Hong

Seong Mo Moon

Pyung Koo Park

Ho Sun Yoon

Seung Woo Hong

Kyung Soo Kim

Jun Kyun Choi

Sang Jin Hong

Jung Sik Kim

Soon Seok Lee

Mun Kee Choi

Tae Soo Jeong

Provided are methods of ensuring network continuity performed at a local gateway, a fixed gateway, and a network device. The method of ensuring network continuity performed at a local gateway includes establishing a tunnel with a fixed gateway serving as a relay between an Internet service server and the local gateway, and performing communication with the fixed gateway through the tunnel. Therefore, even when the type of an uplink signal received by a local gateway changes or the local gateway is in an uplink signal shadow area, a terminal connected to the local gateway can be provided with a seamless Internet service.

Methods of ensuring network continuity performed at local gateway, fixed gateway, and network device

Disclosed are a system for managing virtual private networks (VPNs) includes: terminals configured to transmit user data; a manager configured to transmit information for concealing networks and managing the VPNs; border gateways configured to decrypt the user data and perform a network address translation (NAT) procedure and a filtering procedure on the decrypted user data based on the information; and servers configured to receive the user data subjected to the NAT procedure and the filtering procedure, wherein the filtering procedure is a procedure discarding the user data to be transferred to the servers that are not allowed so as to allow the terminals to access only the allowed servers, the NAT procedure is a procedure changing an Internet protocol (IP) address used in a first network to an IP address used in a second network, and the first network and the second network are different networks.

System for managing virtual private network and method thereof

The invention relates to a method and an apparatus for controlling seamless handover between heterogeneous networks based on IPv6 over IPv4 tunneling. When IPv6 service is provided using tunneling in an IPv4 based network environment, handover of a mobile terminal between different networks is achieved through switching of an active tunnel and a standby tunnel, and thus handover between different networks is facilitated and data loss is prevented to secure continuity of service provided to the mobile terminal even when the mobile terminal hands over to a heterogeneous network.

Apparatus and method of controlling seamless handover between heterogeneous networks based on IPv6 over IPv4 tunneling mechanism

The present invention relates to tunneling an IPv6 packet through an IPIv4 network. In using a tunneling method upon transmitting an IPv6 packet in an IP network, when destination nodes desired to be communicated are located within the same IPv6 prefix network, IPv6 prefix information is added for the management of a tunnel entry. Hence, tunneling information on terminals located within the same IPv6 prefix network can be managed as one tunnel entry. Accordingly, the time consumed when retrieving a tunnel entry can be reduced.

Tunneling IPv6 packet through IPv4 network using a tunnel entry based on IPv6 prefix and tunneling IPv4 packet using a tunnel entry based on IPv4 prefix

A high speed ATM cell synchronizing switching apparatus is disclosed, and the apparatus includes: a plurality of ATM cell inputting circuits 1 for receiving optical ATM signals; a routing control circuit 2 for receiving address information; a cell gate circuit 3 for transmitting the inputted cells synchronously; a switching information tabling circuit 4 for switching the switching information; and a switching matrix circuit 5 for receiving and outputting the switching control information and the cell data information.

High speed ATM cell synchronizing switching apparatus

Growing community of inventors

Choongchungnam-do, South Korea

Young Soo Shin