Samsung Electronics Co., Ltd.

Kee-Sung Nam

Yun-Je Oh

Tae-Sung Park

Tae-sung Park

Ki-Cheol Lee

Ki-cheol Lee

Han-You Jeong

Provided are a method and a system for transmitting mobile IP packets without loss. The method includes the steps of storing, by an old radio access station, packets that are not transmitted to a mobile terminal when a handover indication message is received, and creating, by the old radio access station, a tunnel to a new radio access station, and transmitting the stored packets to the new radio access station via the tunnel when a link-layer handover procedure is completed. Thus, upon the handover of the mobile terminal, IP packets directed to the old access control router and the old radio access station are stored in the buffer and then transmitted via the tunnel after the handover, thereby preventing loss of packets during the handover. Thus, yield cannot be degraded upon the handover and seamless network connection service can be provided.

Method and system for lossless transmission of mobile IP packets in handover of a mobile terminal

A handover control method and apparatus are provided to efficiently buffer packets in a Mobile Worldwide Interoperability for Microwave Access (WIMAX) network. A serving radio access station (S-RAS) and an access control router (ACR) divide and buffer packets to be sent to a mobile station before and after a predetermined message exchange process. The Access control router (ACR) sequentially tunnels a packet buffered in the serving radio access station (S-RAS) and a packet buffered in the Access control router (ACR) into a target radio access station (T-RAS) when a handover for the mobile station is completed. Since an unnecessary buffering operation is not performed in the Access control router (ACR) and the radio access station (RAS), a resource waste may be avoided.

Handover control method and apparatus for efficiently buffering packets in wimax network

A system and method for controlling layer(L) handover of a mobile node is disclosed. A mobile Internet protocol (MIP) network includes a plurality of mobile nodes, a plurality of users, a plurality of routers, and a handover control system. The plurality of routers periodically report state information of a plurality of base stations and the plurality of routers to a handover control system, which receives the state information to produce a handover topology map and maps a current location of the plurality of mobile nodes to the handover topology map to search for a plurality of target routers having a highest probability of handover. The handover control system transmits the state information of the searched target routers to the mobile nodes. Thus, the Lhandover time can be shortened to tens of ms or less, allowing for seamless real-time multimedia service even though a terminal moves.

Apparatus and method for controlling layer 3 handover of mobile node

An Ethernet passive optical network provides a subscriber with a high speed and large capacity data service and a real time digital broadcast/video service. The network includes an optical line terminal for frame-multiplexing broadcast/video signals, which are obtained by performing a switching operation and a time-slot multiplexing with respect to a plurality of digital broadcast/video data delivered from external broadcasting vendors according to broadcast/video selection information delivered from each user, and communication data delivered through an Internet protocol network.

Ethernet PON using time division multiplexing to converge broadcasting/video with data

An Ethernet-PON integrates broadcast/communication through time division multiplexing, which provides users with high-speed, high-volume communication data and high-quality, real-time digital broadcast/image data. An OLT performs a switching operation on a plurality of digital broadcast/image data received from an external broadcaster according to respective broadcast/image selection information from users, time-division-multiplexes the data into a broadcast/image signal, multiplexes the signal and communication data from an IP network into a frame, and electro-optically converts the frame and transmits to the frame to ONTs through an optical splitter. Each ONT receives and photoelectrically converts the signal from the OLT, and performs frame & time-slot demultiplexing to output the entire received communication signals and broadcast/image information contained in a time-slot assigned to the ONT to a corresponding user. The ONT receives a communication signal and broadcast/image selection information from the user, and outputs them to the OLT through the splitter.

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Seoul, South Korea

Kee-Sung Nam