Electronics and Telecommunications Research Institute

Motorola Corporation

Korea Telecommunication Authority

Korea Telecom

Jong-Arm Jun

Yoonmee Doh

Noseong Park

Tae-Wook Heo

Cheol Sig Pyo

Ik-Kyun Kim

Hyunhak Kim

Sung-Hyuk Byun

Jong-Oh Kim

Hyun-Hak Kim

Kyou-Ho Lee

Young-Wook Cha

Nae-Soo Kim

Byeong Cheol Choi

Sun-Joong Kim

Kwang Soo Kim

In Hwan Lee

Dan-Keun Sung

Woo-Sug Jung

Jae Hong Ruy

Byung Bog Lee

Young-Sun Kim

Byungjun Ahn

Myung Nam Bae

Byung-Jun Ahn

Seung-ki Hong

Kwang-Soo Kim

No-Seong Park

Young-Min Ji

Byung-Yong Sung

Seung-Yeob Nam

A high energy efficiency sensor node and an operating method thereof are provided. The high energy efficiency sensor node may include a sensing unit to generate sensed information and to store the sensed information in a database when a set period commences, and a control unit to obtain n pieces of sensed information corresponding to n periods from the database, and to transmit the n pieces of sensed information obtained to a first neighbor node when the n periods elapse.

Sensor node with periodic information generation and controlled information transmission

In a wireless sensor actuator network system, actuators to be actuated to correspond to a plurality of sensors are selected using an A-S matrix that represents relationship strength between a plurality of actuators and the plurality of sensors based on sensing data of the plurality of sensors, and only the selected actuators determine actuation values based on values of the A-S matrix.

Actuator based on sensor actuator network and method of actuating the same

A method for transmitting, storing and managing data by compressing data packets to be transmitted and received over an advanced metering infrastructure (AMI) network with low-capacity memory and low-transfer rate. A number of transmission packets may be reduced using at least one of a bitmap interval algorithm that assigns a bitmap value to each interval, thereby reducing a number of request packets, a repeated-bitmap interval algorithm that represents sequential data values as bitmap values by toggling a bit value between 0 and 1 in each data value when a change occurs in the sequential data values, and a run-length encoding algorithm that compresses data by encoding run length of sequential identical data.

Method and apparatus for data management in advanced metering infrastructure network

Provided is a Media Access Control (MAC) technology that may improve a data transmission performance in an asynchronous sensor network. The MAC technology may increase a waked-up time interval of a reception node to thereby continue to receive traffic from a transmission node, and change a frequency band where data is transmitted and received to thereby reduce occurrence of collision. Also, when the wake-up time interval of the reception node is similar to a wake-up time of a neighboring node, the wake-up time interval of the reception node may be moved to another time interval, thereby improving the data transmission performance.

Sensor node for using asynchronous MAC

Provided is a data transmission method of a plurality of sending nodes in a sensor network. In the data transmission method, data is generated to be transmitted to a receiving node, respectively. Headers of the generated data are transmitted to the receiving node, respectively, in response to a Wake-up Notification Message (WNM) from the receiving node. A Grant Notification Message (GNM) for selecting one of the plurality of sending nodes is received from the receiving node. The plurality of sending nodes transmit a payload of the generated data according to the GNM, or switch into sleep mode without data transmission.

Data transmission method in sensor network

Disclosed is a method of preventing overlap of multiple PANs in a ZigBee network. According to the method of preventing overlap of multiple personal area networks (PANs) in the ZigBee network, a first node included in a first PAN of the ZigBee network verifies whether overlap of the multiple PANs occurs by verifying packets received from neighbor nodes, identifies beacon information of a neighbor node that causes the overlap of the multiple PANs by gradually adjusting radio frequency (RF) transmission wave, and adjusts a communication range based on the beacon information.

Multiple pans conflict resolution method in zigbee

A low-power method for media access control on a semi-linear sensor network with multiple sensor nodes, includes: sensing a channel after waking up from a sleep mode by an arbitrary transmission sensor node that has obtained data; and generating a long preamble including a number of element preambles and sending to a destination sensor node after said channel sensing. This method further includes: sending said data to said destination sensor node after completion of transmission of said long preamble; and identifying duty cycle information of said destination sensor node after completion of transmission of said data and adjusting the number of said element preambles according to said duty cycle information.

Low-power method for media access control in semi-linear sensor network

Provided are a sensor node of a low power for a monitoring application in a mesh sensor network using a time division access scheme, and a routing method thereof. The routing method of the sensor node may include: transmitting a beacon containing routing information to neighboring nodes in a first time slot within a first beacon interval that is allocated to the sensor node; and receiving a beacon from each of the neighboring nodes in a second time slot within a second beacon interval that is allocated to each of the neighboring nodes.

Sensor node of low power for monitoring application in mesh sensor network using time division access scheme, and routing method thereof

Provided are an apparatus and method for asset tracking based on a ubiquitous sensor network (USN) using a motion sensing. The apparatus may include: a motion sensing manager to receive motion sensing information from a sensor; a filtering processor to filter the motion sensing information based on a filtering parameter and to determine whether a motion occurs based on the filtered motion sensing information; and a location information update (LU) manager to perform LU depending on whether the motion occurs.

Apparatus and method for asset tracking based on ubiquitous sensor network using motion sensing

Disclosed is a configuration method and device for a two-dimensional expandable crossbar matrix switch for application to tera-level high-speed and large-capacity switches. The present invention includes N input ports, N output ports, and an N&#xd7;N matrix switch for transmitting cells between the input and output ports. Each input port includes N VOQs which are sequentially combined by n VOQs to configure respective L VOQ groups. The L VOQ groups are connected to L XSUs through independent interface ports. Therefore, each input port can transmit a maximum of L cells to the matrix switch during one cell time slot.

Scalable crossbar matrix switch and arbitration method thereof

A high speed and high capacity switching apparatus is disclosed. The apparatus includes: N input ports each of which for outputting maximum l cells in a time slot, wherein each of the N input ports includes N virtual output queues (VOQs) which are grouped in l virtual output queues group with n VOQs; N&#xd7;N switch fabric having lcrossbar switch units for scheduling cells inputted from N input ports based on a first arbitration function based on a round-robin, wherein l VOQ groups are connected to l XSUs; and N output ports connected to l XSUs for selecting one cell from l XSUs in a cell time slot by scheduling cells by a second arbitration function based on a backlog weighed round-robin, which operates independently of the first arbitration function, and transferring the selected cell to its output link.

Scalable crossbar matrix switching apparatus and distributed scheduling method thereof

The present invention relates to a broadband terminal equipment for congestion control in the ring structure and its control method, and the object of the invention is to prevent ATM traffic congestion which can be produced in the ring in order to realize the ATM subscriber premises network having a ring structure. The invention is provided with a means (313) which stores real time traffic for a while, a means (314) which stores non-real time traffic for a while, a means (312) which notifies a broadband network terminator of network congestion and controls network traffic transmission, an ATM adaptation layer transmission means (317) inclusive of a means (315) which stores self-created real time traffic and a means (316) which stores self-created non-real time traffic, and a means (319) which transmits the self-created real time traffic and non-real time traffic and receives real time traffic and non-real time traffic which are inputted from a front broadband terminal equipment if destined for itself and transmits those traffics to a rear broadband terminal equipment if not destined for itself. The invention is used in the broadband integrated service network subscriber premises equipment.

Broadband terminal equipment for congestion control in the ring

A floating cell removing device using a generic flow control includes a processor having a generic flow control processing logic for transmitting/receiving a signal cell, checking a generic flow control field of an operation and maintenance cell and removing a floating cell; a pair of cell relay and add/drop function units respectively connected to a subscriber and a network of the processor, for supporting an internal communication between subscriber terminals, temporarily storing the signal cell and transmitting it to a network device; a pair of asynchronous transfer mode hierarchical function processors for converting a cell header, inserting and extracting an operation and maintenance cell, and transmitting it to the processor and the cell relay and add/drop function units; and a plurality of buffers formed between the processor and the cell relay and add/drop function units and between the cell relay and add/drop function units, for temporarily storing data inputted therefrom.

Growing community of inventors

Daejeon, South Korea

Jong-Arm Jun