Kt Corporation

Samsung Electronics Co., Ltd.

Seoul National University

Do-Young Kwak

Hyung-Jung Kim

Jong-Sik Lee

Jong-Ho Lee

Young Seok Kim

Seung-Hoon Nam

Jae-Hak Chung

Hyo Jin Lee

Chan-Soo Hwang

Seong-Cheol Kim

Sung-Yeop Pyun

Jae-Choong Han

The present disclosure provides a wireless communication system including a plurality of remote units, and a digital unit configured to connect one output port to at least one of i) one remote unit having a maximum antenna number of antennas among the plurality of remote units and ii) two or more remote units each having antennas smaller than the maximum antenna number among the plurality of remote units.

Wireless communication system, method for transmitting information of user equipment, method for receiving information of base station, and user equipment and base station thereof

The disclosure is related to adaptive load management in a femtocell network. A load state of a femtocell base station may be determined as one of a low load state, a middle load state, and a high load state. According to the determined load state, a reserved service capacity and an available service capacity of the femtocell base station may be adaptive controlled. Furthermore, at least one handover trigger condition associated with the femtocell base station may be controlled according to the determined load state of the femtocell base station.

Load management

A wired/wireless convergence apparatus may be provided for integrally transmitting wired network traffic and wireless network traffic in an in-building cloud network composed of a plurality of digital units and a plurality of radio units includes. The wired/wireless convergence apparatus may include a traffic monitoring unit and a wired/wireless traffic control unit. The traffic monitoring unit may be configured to monitor wireless network traffic and wired network traffic input to the in-building cloud network. The wired/wireless traffic control unit may be configured to allocate wireless network traffic resources to optical fibers on the basis of monitored information of the traffic monitoring unit and to allocate wired network traffic to idle resources remaining after allocation of the wireless network traffic.

In-building wired/wireless convergence apparatus and resource allocation method thereof

A apparatus and method for estimating a sequence of transmitted quadrature amplitude modulation (QAM)-modulated signals and space-time block coded signals using an optimal expectation-maximization (EM)-based iterative estimation algorithm in a multiple-input and multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) mobile communication system. An initial sequence estimation value is produced on the basis of a predetermined initial value using a pilot sub-carrier contained in each of OFDM signals received by a receiving side. A normalized value of a received signal on a channel-by-channel basis is produced by a predetermined equation using orthogonality between the OFDM signals received by the receiving side. At least one subsequent sequence estimation value is produced using the initial sequence estimation value and the normalized value of the received signal on the channel-by-channel basis. If the subsequent sequence estimation value converges to a constant value after an operation of producing the subsequent sequence estimation value is iterated the predetermined number of times, the converged subsequent sequence estimation value is designated as a final sequence estimation value.

Method and apparatus for estimating a signal sequence in a MIMO-OFDM mobile communication system

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Seoul, South Korea

Do-Young Kwak