Samsung Electronics Co., Ltd.

Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Korea Telecom

Ju-Yong Lee

Sung-Hyuk Byun

Jeong-Won Heo

Jae-Goo Lee

Tae-Young Chung

Chang-Hyun Cho

Cheol-Ju Yun

Jae-Jin Shin

Jin-Woo Yang

Dan-keun Sung

Kyung-geun Lee

Ji-Yun Seol

Tae-Young Kim

Ki-Back Kim

Kyu-Hyun Lee

Dan-Keun Sung

Tae-Soo Kwon

Eun-Chan Park

Kyeong-Ho Lee

Soo-Jong Lee

Kyung-Geun Lee

Tae-Won Kim

An apparatus and a method for configuring and managing/controlling a cluster, which is a set of Base Stations (BSs) for transmitting signals cooperatively, are provided. The method includes broadcasting cluster set information indicating information about a plurality of clusters including a serving BS to a User Equipment (UE), receiving a report of information about Received Signal Strength Indicators (RSSIs) of control signals transmitted from BSs included in the plurality of clusters from the UE, and assigning any one of the plurality of clusters to a cluster for servicing the UE based on the information about the RSSIs of the control signals.

Multi-tier clustering apparatus in wireless communication system and method thereof

Disclosed is an apparatus and method for an MBS service in a BWA system. An apparatus of a base station includes a time controller, a CAC processor, and a buffer controller. The time controller manages a broadcast start time and a broadcast end time and generates a broadcast start message at a predetermined time before the actual broadcast start time. Upon receipt of the generated broadcast start message from the time controller, the CAC processor calculates a capacity decrease due to broadcast service and subtracts the capacity decrease from the current available capacity to update the available capacity. Upon receipt of the generated broadcast start message from the time controller, the buffer controller controls the buffer occupation of unicast traffic in order to provide the buffer space required for a broadcast service.

Apparatus and method for multicast and broadcast service in broadband wireless access system

A semiconductor device including storage nodes and a method of manufacturing the same: The method includes forming an insulating layer and an etch stop layer on a semiconductor substrate; forming storage node contact bodies to be electrically connected to the semiconductor substrate by penetrating the insulating layer and the etch stop layer; forming landing pads on the etch stop layer to be electrically connected to the storage node contact bodies, respectively; and forming storage nodes on the landing pads, respectively, the storage nodes of which outward sidewalls are completely exposed and which are arranged at an angle to each other.

Semiconductor device including storage node and method of manufacturing the same

Disclosed herein are a semiconductor device and a method of manufacturing the same that increases the reliability of these devices as size design limitations decrease. Generally, a first insulating film, and wiring, including conductive film patterns and second insulating film patterns are formed on a substrate. Third insulating film patterns including a silicon-oxide-based material are formed on sidewalls of the wiring, and contact patterns and spacers on the sidewalls thereof for defining contact hole regions are formed on the wiring. The contact holes contact surfaces of the third insulating film patterns and pass through the first insulating film. Thus, the thickness of a second insulating film pattern used in the wiring can be minimized, thereby increasing a gap-fill margin between the wiring. A parasitic capacitance between the wiring can be reduced because silicon oxide spacers with a low dielectric constant are formed on sidewalls of the wiring.

Semiconductor device and method of manufacturing the same

An ATM switch having the buffer threshold controller to control the cell input into the switching element using the back-pressure signal and a method for determining the buffer threshold according to the buffer threshold controller are disclosed. The ATM switch includes buffer pool storing the cell input to the switch; buffer pool control part storing the buffer pool occupancy information per input port of the buffer pool; threshold control part receiving the buffer pool occupancy information from the buffer pool control part and calculating the threshold per input port periodically and then sending it to the buffer pool control part; input crosspoint control part controlling the cells input to the buffer pool by receiving the control signal from the buffer pool control part; and output crosspoint control part controlling the cells output from the buffer pool by receiving the control signal from the buffer pool control part. The method includes the steps of calculating r , the buffer pool occupancy rate of the ith input port (i&equals;1, 2, 3, . . . , N); calculating r , the threshold of the buffer pool occupancy rate of the ith input port; calculating L , the number of occupation of the cells in the buffer pool of the ith input port; calculating the difference, D &equals;t &minus;L (k&equals;1, 2, 3, N . . . , N) between t , the threshold of the jth input port and L , the number of cells stored in the buffer pool, where i&ne;j (j&equals;1, 2, 3, . . . , N); calculating t , the threshold in case where the t &minus;L is the kth value in descending order from the N input ports; calculating b , minimum threshold to guarantee the minimum cell input; and comparing &Dgr;, the minimum unit of increase or decrease of the threshold and the value of t &minus;b .

ATM switch and a method for determining buffer threshold

A controller for the logical buffer depth in ATM switching system and a method for determining the logical queue depth, using the back-pressure signal and the occupied buffer depth information and supporting the P classes, are disclosed. The controller includes Routing Table Element making tag for routing of input cell; Input Buffer storing the cell that a tag is attached to in said routing table element; Switch fabric that reads the cell from said input buffer and then switches it to the output port; and Input buffer controller controlling the logical queue size in said input buffer. And the method for determining the logical queue depth includes the steps of calculating the back-pressure signal occurrence rate b,of the ith class; calculating the back-pressure signal occurrence threshold rate b,of the ith class; calculating the buffer depth T,of the logical queue of the ith class; calculating threshold values T,T,of the two buffer depths of the ith class; calculating the buffer size L,of the logical queue of the ith class; calculating the empty area size D,(j&equals;1, 2, 3, L, P) of logical queues for the number of p classes.

Input buffer controller using back-pressure signals in ATM switches and a method for determining the logical queue size

An idle address controller for a shared buffer type ATM switch controls the addresses of output cells in a common memory to be stored directly in an idle address buffer without passing through the conventional idle address delay controller, by improving the idle address control scheme of a unit switch. The idle address controller includes an idle address control signal generator for generating idle address control signals based on the buffer length information from counters, idle address control signal buffers for storing the idle address control signals, and an idle address control signal multiplexer. Therefore, the idle addresses can be efficiently provided, and this mechanism lowers cell loss and reduces required memory capacity.

Idle address controller for shared buffer type ATM switch

Growing community of inventors

Seoul, South Korea

Ju-Yong Lee