Samsung Electronics Co., Ltd.

University-industry Cooperation Group of Kyung Hee University

Seoul National University

Snur & Db Foundation

Sun-Gi Kim

Yong-Seok Park

Jin-Ho Kim

Yong Ho Lee

Jin-Hyoung Kim

Hyo-Hyun Choi

Sae-Woong Bahk

Dae-hyung Kwon

Choong-Seon Hong

Woo-Guil Pak

Byung-Goo Choi

Kill-yeon Kim

Wook Choi

Tae-shik Shon

Jong-Sang Oh

Jae-Hwoon Lee

Ji-Young Huh

Jihyuk Hgo

Hyung-Ho Kong

Kill-Yeon Kim

A medium access control (MAC) frame provision method establishes security in an IEEE 802.15.4 network. A MAC frame is generated, which includes a MAC header, a payload field, and a frame check sequence (FCS) field, the payload field including relevant main data according to a frame type defined in the MAC header. A disguised decoy data sequence number (DSN) is generated and inserted into the MAC header. A real DSN, which is a corresponding transmission sequence number of the MAC frame, is generated and inserted into the payload field. The MAC frame is transmitted, including the encrypted payload field, to a counterpart node. A MAC ACK frame acknowledges reception of the transmitted MAC frame; and a DSN is compared in the received MAC ACK frame with the real DSN. An authentication of the counterpart node is performed when the received MAC ACK frame is equal to the real DSN.

MAC frame provision method and apparatus capable of establishing security in IEEE 802.15.4 network

A method is provided for supporting mobility of a Mobile Node (MN) in a multi-hop Internet Protocol (IP) network, in which an MN that has moved from a source Personal Area Network (PAN) to a target PAN, sends a Router Solicitation (RS) message with an option for requesting its profile to a gateway of the target PAN, and receives a Router Advertisement (RA) message from the gateway in response to the RS message. The RA message includes a home prefix of the MN as the requested profile. The method supports mobility of MNs, enables unicast communication, and facilitates efficient use of the network.

Method for supporting mobility of a mobile node in a multi-hop IP network and a network system therefor

A method is provided for registering a mobile router in an Internet Protocol version 6 over Low power Wireless Personal Area Network (6LoWPAN) network. The mobile router detects movement into a wireless network through the reception of a beacon message, and sends a Router Solicitation (RS) message requesting registration in the wireless network to a gateway. The gateway acquires an address of the mobile router from the RS message, stores the acquired address, assigns a new address to be used in the wireless network to the mobile router, and sends a Router Advertisement (RA) message with assigned address information and gateway address information, to the mobile router. The mobile router acquires the assigned address information and the gateway address information from the RA message.

Method for supporting route optimization in 6LoWPAN based MANEMO environment

A system and method for exactly estimating a volume of traffic is provided when packets are transferred within the network. The system and method receive data packets from clients through a plurality of router-for-clients, and creating a flow information packet for estimating information about a flow, transfer the data packets and the created flow information packet to the destination router-for-client via a router-for-relay, calculate information about the traffic of a flow at the destination router-for-client through the flow information packets transferred from the router-for-clients, and estimate a volume of the traffic. Thus, the system and method can estimate the volume of the traffic on the network with respect to the aggregated flow defined by the router pair connected to the terminal or the external network when the traffic is actually introduced into the network, instead of the flows of each terminal and each destination.

System and method for estimating flow-specific traffic volumes

A hybrid channel assignment method comprising the steps of negotiating among routers to select one router to act as a central server; collecting, at the selected router, information on an entire network transmitted from the other routers, and assigning channels based upon the information on the entire network; and reassigning channels of respective routers based upon dynamically-changing traffic characteristics. The hybrid channel assignment method can assign channels using both centralized processing and distributed processing in order to ensure optimally correct channel assignment consistent with present traffic characteristics. This as a result can prevent network resources from being wasted and also increase network capacity, thereby optimizing effective use of the network resources.

Hybrid channel assignment method and router thereof

An apparatus, computer program and method for packet buffer management in an IP network system. The apparatus includes at least one link queue buffer, a shared buffer, a buffer state detector, and a buffer manager. The at least one link queue buffer is allocated a buffer of a packet stored in a memory. The shared buffer is excessively allocated when exceeding a minimum buffer threshold value. The buffer state detector determines whether a buffer value stored in a link queue buffer of a corresponding link exceeds a preset minimum buffer threshold value. The buffer manager sets the shared buffer to be included in the link queue buffer if the stored buffer value exceeds the preset minimum buffer threshold value.

Apparatus and method for packet buffer management in IP network system

Provided is a method and apparatus for reserving a session resource in an IPv4/IPv6 combination network system. It allows a node to simultaneously establish an end-to-end session and a tunnel session by notifying a starting node of the tunnel session in advance about whether a last node supports RSVP while assigning IPv4 address information to an IPv6 host according to DSTM upon reserving a resource according to an RSVP mechanism in a 4over6 dual stack transition mechanism (DSTM) environment.

Apparatus and method for reserving session resource in IPv4/IPv6 combination network

The present invention relates to a ball grid array (BGA) chip-fixing device capable of easily fixing the ball grid array (BGA) chip on a printed circuit board (PCB). The device comprises: a fixing box fixed in place on a printed circuit board and having a through-hole; a ball grid array (BGA) chip for being settled within the through-hole of the fixing box to electrically connect with the printed circuit board; a heat sink layered on the upper face of the ball grid array (BGA) chip; a cover fixed over the fixing box; and a pressing unit provided on the underside of the cover for pressing the heat sink in a mounting direction of ball grid array (BGA) chip. The ball grid array (BGA) chip is fixed without soldering, the fixing and separation are simple since the assembly is made via simple screw-fastening, and the ball grid array (BGA) chip can be reused.

Fixing device for fixing ball grid array chip on a substrate without soldering

An error master detector for use in a system having at least two bus masters which request bus use and a bus arbitrator for receiving the bus use requests of the bus masters to arbitrate the bus use. The error master detector includes a bus grant signal synchronizer for latching a bus grant signal generated from the bus arbitrator by a predetermined bus clock; a latch clock generator for latching a latch clock for combining the bus grant signal generated from the bus arbitrator and an output signal synchronized in the bus grant signal synchronizer to latch the bus master information receiving the bus grant signal; a first latch unit for latching an output signal of the bus grant signal synchronizer in synchronous with the latch clock, and clearing the latched value when the bus cycle is normally finished; a second latch unit for latching an output signal of the first latch unit in synchronous with the latch clock; a master information selector for generating the output signal of the first latch unit when the second latch unit has no latched bus master information, and generating the output signal of the second latch unit when the second latch unit has latched master information; and an error master storage unit for storing data selected from the master information selector when a bus cycle error occurs. This way when an error occurs in a bus system in which the arbitration cycle and the data transfer cycle are separately performed, the bus master which causes the error can be easily detected so that the system can be rapidly repaired.

Error master detector

A DMA controlling device is provided. The DMA controlling device includes a DMA control register for storing an instruction, which is transmitted to the DMA controlling device by the microprocessor for the DMA transmission: a DMA count register for recording a number of DMA transmission; means for generating the address of the source memory during the DMA transmission; means for generating the address of the destination memory during the DMA transmission; a DMA data buffer for temporarily storing data of the source memory before the data of the source memory is transmitted to the destination memory; DMA arbitrating means for arbitrating a memory access priority upon the occurrence of each the DMA transmission cycle when the memory access request is received from at least one master intending to use one of the source and destination memories during the DMA transmission; and DMA engine controlling means for requesting the memory access priority from the DMA arbitrator, transmitting memory control signals to a master which has the memory access priority, and transmitting information regarding the DMA transmission frequency to a DMA count register. Therefore, the performance of a multiprocessor system requiring high speed balanced with a minimum pause time can be improved by supporting a DMA transmission cycle together with a general processor cycle.

Growing community of inventors

Seoul, South Korea

Sun-Gi Kim