Abstract:
PURPOSE: An opportunistic power control method based on a cluster in a wireless communication system is provided to set up a femto cell interference tolerance based on large-scaled channel information and to restrict an integrated interference of a femto cell uplink signal. CONSTITUTION: A macro BS(Base Station)(810) broadcasts interference tolerance of a femto cell unit(a). A femto BS(820) allocates power to a terminal in consideration of path loss. The femto BS measures channel activity according to a femto cell group of a cluster unit. The macro BS changes the interference tolerance in order to meet a QoS(Quality of Service) of femto cell power allocation.
Abstract:
단순화된 1차 식을 이용하여 LLR을 도출하는 부분선형 디매퍼는 정확한 LLR을 도출하는 ML 기반의 LLR 디매퍼와 견주어 미미한 성능 열화만을 보인다. 이런 부분선형 디매퍼가 채널 부호가 충분히 낮은 블록 오율을 보이는 SNR 영역에서는 정확한 LLR 디매퍼에 거의 근사하지만, 낮은 SNR으로 갈수록 비선형 성분의 영향이 커서 로그 우도를 기반으로 하는 LLR 메트릭과의 오차가 증가한다. HARQ가 적용되는 경우에는 미리 정해진 최대 전송 회수의 재전송이 허용되기 때문에 HARQ가 적용되지 않는 경우에 비해서 훨씬 낮은 SNR 영역에서 시스템이 동작한다. 이를 개선하기 위하여, 본 발명의 실시예에서는 선형부와 보정부를 구비하는 디매퍼를 제안한다. 본 발명의 실시예에 따른 디매퍼는 수신신호의 선형성분을 계산하고, 또한 수신신호의 제1 및 제2비선형성분을 계산한 후, 이런 제1 및 제2비선형성분 값을 선형성분에 보정하여, 낮은 SNR 영역에서 발생되는 성능 열화를 개선한다. 디매퍼, 입력 메트릭, HARQ, 매퍼
Abstract:
다양한실시예들에따른무선통신시스템의매크로기지국에서클러스터기반의전력제어를위한방법에있어서, 매크로셀(macro cell) 사용자의 QoS(quality of service)에적합하도록동작상태의펨토(femto) 셀들의간섭에기반하여상기동작상태의펨토셀들의송신전력과간섭허용치를결정하는과정과, 상기간섭허용치를상기동작상태의펨토셀들로방송하는과정과, 클러스터내에서각각의펨토셀에대한채널액티비티(channel activity)를고려하여상기간섭허용치를업데이트하는과정을포함할수 있고, 상기동작상태의펨토셀들의상기송신전력은 large-scale 페이딩(fading)을고려하여할당될수 있고, 상기간섭허용치는전력손실식에펨토셀 사용자의상향링크전력을곱하여펨토셀 단위로결정될수 있다.
Abstract:
PURPOSE: In the wireless telecommunications system, by forming a demapper including the linear portion and correction the input metric formation apparatus and method of decoder supplement the HARQ performance degradation at the low SNR domain of the piecewise linear demapper. CONSTITUTION: A linear part(410) calculates the linear component of the demodulated received signal. A correction part(420) respectively calculates the first of the demodulated received signal as described above and second non-linearity. Correction revises the first and second non-linearity according to the output of the linear portion. Correction comprises a first nonlinear component calculator(421) calculating the first nonlinear component value in the demodulated received signal as described above.
Abstract:
PURPOSE: A method and a device for transceiving control information are provided to transceives MU-MIMO(Multi User-MIMO) control information and SU-MIMO(Single User-MIMO) control information. CONSTITUTION: A first control information generating unit(904) generates first control information for all transmission mode except for a MU-MIMO mode. A second control information generating unit(906) generates second control information for the MU-MIMO mode. A transmission signal processing unit(908) transmits the generated first control information to the terminal through a control channel within a sub frame. The transmission signal processing unit transmits the generated second control information to the terminal through a data channel which is not a control channel within a sub frame.
Abstract:
PURPOSE: A random access channel transmission method in a wireless communication system are provided to selectively perform a random channel transmission by considering channel state of reversed direction in a remote node of the wireless communication system. CONSTITUTION: A remote node measures power of a forward signal of a host node if a forward signal is received(301,303). The remote node checks a reference value for determining transmission of a random access channel(305). The remote node compares the power of the measured forward signal and the checked reference value(307). If the power of a forward signal is bigger than the reference value, the remote node transmits a signal through a reverse RACH(Random Access Channel)(309).
Abstract:
A cell searching method in a communication system and a device are provided to transmit a cell number safely through the second synchronous channel after obtaining frame synchronization by the first synchronous channel by using an error correction code or repeatedly sending cell information, thereby variably controlling a time taken through the second synchronous channel according to channel situations. Slot timing and frame timing are detected by using the first synchronous channel. An ID of a cell to which a terminal belongs or a group ID of the cell is detected by using the second synchronous channel. The slot timing is detected from a synchronous code which constitutes the first synchronous channel. One code sequence is estimated among N code sequences according to the number of synchronous slots of the first predetermined synchronous channel, and the frame timing is detected from the estimated code.