Abstract:
본 발명은 광대역 무선통신 시스템에서 핸드오버에 관한 것으로, 기지국은, 단말들의 이동경로 정보 및 인접 기지국 수신신호 세기 정보를 이용하여 상기 단말들을 그룹핑하여 적어도 하나의 그룹을 구성하는 그룹핑기와, 동일 그룹에 속한 단말들 중 소정 개수의 단말들이 핸드오버하는 경우, 상기 그룹 내의 나머지 단말들의 히스테리시스 정보를 수정하는 관리부와, 수정된 히스테리시스 정보를 포함하는 메시지를 상기 그룹 내의 나머지 단말들로 송신하는 송신부를 포함하여, 핸드오버 히스테리시스를 조절함으로써, 상기 단말이 수신신호 세기가 낮은 서빙 기지국과 통신을 유지하는 시간을 감소시켜 통신 품질을 향상시킬 수 있다. 광대역 무선통신 시스템, 핸드오버(Handover), 히스테리시스(Hysteresis)
Abstract:
본 발명은 광대역 무선통신시스템에서 동기를 잃은 기지국에 대하여 가드밴드를 설정하기 위한 장치 및 방법에 관한 것이다. 본 발명에 따른 기지국 장치는, 기지국간 동기 오차가 발생된 경우, 가드밴드를 설정하기 위한 제어신호를 발생하는 제어기와, 상기 제어신호에 따라 상기 기지국의 고유대역 중 상기 가드밴드를 제외한 대역에 송신 데이터를 매핑하여 출력하는 매퍼와, 상기 매퍼로부터의 데이터를 다중반송파 변조하기 위한 연산기를 포함한다. 이와 같은 본 발명은 기지국간 동기 오차로 발생하는 간섭에 대해서 가드밴드를 설정함으로써, 부반송파간의 간섭을 줄이고 단말의 QoS를 보장할 수 있다. 광대역 무선통신시스템, 가드밴드, 동기 오차, 동기 보정
Abstract:
PURPOSE: A retransmission mode selection method in a MIMO communication system and an apparatus thereof are provided to adaptively change a retransmission mode according to a channel state in the MIMO communication system, thereby improving error recovery capability of an HARQ technique in a fast fading channel. CONSTITUTION: A retransmission mode selection method in a MIMO communication system includes m receiving antennas(122,124) and a retransmission information generating unit(132). The m receiving antennas receive m streams which are initially transmitted. m is a fixed number more than 2. The retransmission information generating unit checks whether channel-decoded streams have errors after channel-decoding m streams.
Abstract:
A resource allocation request system in a communication system and a method thereof are provided to reduce the overhead and delay generated when requesting an additional resource. A transmitter(401) transmits the value of an additional resource request field to a receiver(403)(405). A receiver assigns resources required for transmitting a header from which transmitter can request the additional resource allocation(407). The transmitter transmits a resource allocation request header to the receiver(409). The receiver assigns the resources requested from the transmitter(411).
Abstract:
본 발명은 무선 통신 시스템에 관한 것으로서, 기지국의 멀티캐스트 서비스 제공 방법에 있어서, F번째 프레임에서 다수의 이동국으로 멀티캐스트 서비스에 상응하는 N번째 데이터 트래픽을 송신하는 과정과, F+1번째 프레임에서 적어도 하나의 이동국으로부터 상기 N번째 데이터 트래픽을 수신하지 못하였음을 의미하는 부정응답(NACK) 메시지를 수신하는지 판별하는 과정과, 상기 부정응답 메시지를 수신한 경우, F+2번째 프레임에서 부정 응답 메시지를 송신한 이동국에게 상기 N번째 데이터 트래픽을 재송신하는 과정을 포함한다. 멀티캐스트 서비스, 부정응답, 기지국, 이동국
Abstract:
A signal processing apparatus and a method thereof are provided to update a transmission precoding matrix and transmission weight matrix, repetitively by using channel information and interference information, thereby effectively removing the interference generated in the external cell and internal cell. A base station apparatus in an MU MIMO(Multi-User Multiple Input Multiple Output) wireless communication system comprises a control information checkup device(202), a matrix decider(204), a control information generator(206), a modulator(208), a precoder(210), a signal buffer(212), a multiplexer(214), and a plurality of RFs(216-1_216-N). The control information checkup device confirms the control information received from a terminal. The matrix decider determines a precoding matrix to be used in the base station and a weight matrix to be used in the terminal by using the channel information and interference information. The control information generator produces the control information to be transmitted to the terminal. The modulator modulates information bit strings to be transmitted to each terminal to produce complex symbols. The precoder multiplies transmission signals to each terminal by a corresponding precoding matrix.
Abstract translation:提供信号处理装置及其方法,通过使用信道信息和干扰信息来重复地更新传输预编码矩阵和传输权重矩阵,从而有效地消除在外部小区和内部小区中产生的干扰。 MU MIMO(多用户多输入多输出)无线通信系统中的基站装置包括控制信息检验装置(202),矩阵判定器(204),控制信息生成器(206),调制器(208) ,预编码器(210),信号缓冲器(212),多路复用器(214)和多个RF(216-1_216-N)。 控制信息检查装置确认从终端接收到的控制信息。 矩阵决定器通过使用信道信息和干扰信息确定要在基站中使用的预编码矩阵和要在终端中使用的加权矩阵。 控制信息生成器产生要发送到终端的控制信息。 调制器调制要发送到每个终端的信息位串,以产生复杂的符号。 预编码器通过相应的预编码矩阵将传输信号乘以每个终端。
Abstract:
A system for requesting the bandwidth allocation and allocating a bandwidth and a method therefor are provided to reduce the overhead due to the bandwidth request and improve the QoS(Quality of Service) of each CID by enabling a base station to recognize the bandwidths necessary for each CID without the separate overhead. A mobile station # 2(710) connects a type 2 grant processing sub header(730) including bandwidth information required for a CID #302(703) to a generic MAC header(720) including CID # 105(701) information, and transmits the connected result to a base station. The base station receiving message from the mobile station #2 detects the CID #302 which occupies the sixth on a CID list and the bandwidth requested by the CID #302 through the type 2 grant processing sub header, and then assigns the bandwidth to the mobile station #2.
Abstract:
A method and an apparatus for supporting QoS(Quality of Service) of a wireless communication system are provided to support QoS of a user terminal in a cell boundary zone. An operating method of a base station for supporting QoS of a wireless communication terminal in a cell boundary comprises the steps of: confirming the decline of QoS level in the terminal(501); forming an enhanced service zone for service by which data are simultaneously transmitted to both a neighbor base station and the terminal(505); allocating resources for the simultaneous data transmission service to the terminal(509); and receiving corresponding data from an upper network entity.
Abstract translation:提供了一种用于支持无线通信系统的QoS(Quality of Service,服务质量)的方法和装置,以支持用户终端在小区边界区域中的QoS。 用于支持小区边界中的无线通信终端的QoS的基站的操作方法包括以下步骤:确认终端中的QoS水平的下降(501); 形成用于服务的增强服务区,通过该服务区域同时向邻近基站和终端发送数据(505); 为所述终端(509)分配用于同时数据传输服务的资源; 并从上层网络实体接收相应的数据。
Abstract:
An apparatus and a method for beamforming in a MIMO(Multiple Input Multiple Output) wireless communication are provided to be adapted to the situation of the limited capacity of a control channel for exchanging beamforming vector selection information in a MIMO wireless communication system. A method for operating a base station in an MIMO wireless communication system comprises the steps of: repeatedly calculating, using information of downlink channel matrixes of spatial multiple access user terminals, downlink beamforming vectors of the user terminals to calculate the optimal beamforming vectors for the user terminals(201-207); quantizing the downlink beamforming vectors in order to transmit information of the downlink beamforming vectors(211); feeding forward information of the quantized downlink beamforming vectors to the user terminals over a control channel; calculating the final downlink beamforming vectors of the user terminals in consideration of an error due to the quantization; and summing the beamformed TX signals of the user terminals in accordance with the final downlink beamforming vectors and transmitting the summed TX signals through a plurality of TX antennas(213-221).
Abstract:
An apparatus and a method for transmitting and receiving resource allocation information in a communication system are provided to use a resource tree scheme in transmitting and receiving resource allocation information. A BS(Base Station) allocates downlink/uplink resources to each MS(Mobile Station) according to a predetermined scheduling scheme(100). The BS creates resource allocation information containing code information, which indicates size and location information for downlink/uplink resources allocated to each MS, and code length information, which indicates the length of the code information(102). Then the BS transmits the created resource allocation information to each MS.