Abstract:
디지털 방송 신호 수신 장치에 있어서, 신호를 수신하는 수신 안테나들과, 상기 수신 안테나들을 통해서 수신되는 신호들을 처리하는 신호 처리부를 포함하며 상기 신호 처리부는, 상기 수신 안테나들 중 제1수신 안테나를 통해서 수신된 제1신호를 일정 단위 시간만큼 지연시켜 지연 신호를 출력하는 지연부와, 상기 지연 신호와, 상기 수신 안테나들 중 상기 제1수신 안테나를 제외한, 적어도 하나의 나머지 안테나를 통해서 수신된 제2신호를 합산한 합산 신호를 출력하는 합산부와, 상기 합산 신호를 상기 디지털 방송 신호의 수신 기능을 지원하는 튜너 입력 단자로 출력하는 연결부를 더 포함한다.
Abstract:
본 발명은 이중 직교 주파수 분할 다중화(DOFDM: Double Orthogonal Frequency Division Multiplexing)/이중 직교 주파수 분할 다중 접속(DOFMA: Double Orthogonal Frequency Division Multiple Access) 통신 시스템에서 신호 송신 장치의 신호 송신 방법에 있어서, N개의 서브 캐리어 각각 별로 M개의 서브 샘플에 대해 M 포인트 역 이산 푸리에 변환(IDFT: Inverse Distribute Fourier Transform)(M-IDFT)을 수행하는 과정과, 상기 N개의 서브 캐리어 각각 별로 M-IDFT를 수행한 신호에 제1길이를 가지는 사이클릭 프리픽스(CP: Cyclic Prefix)를 삽입하여 제1신호를 생성하는 과정과, 상기 N개의 서브 캐리어 각각 별로 생성된 제1신호에 대해 N 포인트 IDFT(N-IDFT)를 수행하는 과정과, 상기 N-IDFT를 수행한 신호를 병렬/직렬 변환하는 과정과, 상기 병렬/직렬 변환된 신호에 제2길이를 가지는 CP를 삽입하여 제2신호를 생성� �는 과정과, 상기 제2신호를 신호 수신 장치로 송신하는 과정을 포함하며, 상기 N은 상기 DOFDM/DOFDMA 통신 시스템에서 사용하는 서브 캐리어들의 개수를 나타내며, M은 1 이상의 정수를 나타냄을 특징으로 한다. row wised OFDM 방식, column wised OFDM 방식, 중계기, CP, IDFT, DFT
Abstract:
본 발명은 통신 시스템에서 기지국이 멀티캐스트 서비스를 제공하는 방법에 있어서, 멀티캐스트 그룹에 포함되는 사용자 단말기(UE: User Equipment)들로부터 수신되는 채널 상태 정보(CSI: Channel Status Information)를 사용하여 현재 변조 및 코딩 방식(MCS: Modulation and Coding Scheme) 레벨 적용 구간의 MCS 레벨 적용 상태를 임시로 결정하는 과정과, 이전 MCS 레벨 적용 구간의 MCS 레벨 적용 상태와 상기 임시로 결정된 MCS 레벨 적용 상태를 사용하여 현재 MCS 레벨 적용 구간의 최종 MCS 레벨 적용 상태를 결정하는 과정을 포함한다.
Abstract:
A resource scheduling method for direct device to device communications in a communication system according to the present invention comprises the following steps: selecting a mobile communication terminal to communicating with a base station for each channel dividing mobile communication resources which the base station occupies; calculating a signal to interference noise ratio of the mobile communication terminal by assuming that each terminal pair for direct communications between the selected mobile communication terminal and the terminal located within the service coverage of the base station is allocated to each channel; comparing the signal to interference noise ratio of the mobile communication terminal calculated for each channel with a first threshold and determining the terminal pairs whose signal to interference noise ratios for each channel are greater than the first threshold as candidate members of a combination sharing the relevant channel; and determining whether the relevant channel is allocated to each candidate member of the combination determined for each channel. [Reference numerals] (300) Select a first combination consisting of the entire members of the combination corresponding to a relevant channel;(305) Select a first D2D pair having a maximum SINR among the members of the first combination;(310) Calculate an SINR in terms of a mobile communication terminal if the channel corresponding to the first combination is additionally allocated to the first D2Dpair;(315) If the channel corresponding to the first combination is additionally allocated to the first D2D pair, the SINR in terms of the mobile communication terminal is greater than a first threshold?;(320) Determine not to additionally allocate the channel corresponding to the first combination to the first D2D pair;(325) Assume that the channel corresponding to the first combination is additionally allocated to the first D2D, and calculate an SINR in terms of the D2D pairs to which the channel is already allocated;(330) Is each of SINRs in terms of the first D2D pair and in terms of the D2D pair to which the channel corresponding to the first combination including the first D2D pair is allocated greater than a second threshold?;(335) Delete the first D2D pair from the candidate members of the first combination;(340) Allocate a unit resource of the first combination to the first D2D pair;(345) Does a candidate member whose resource allocation is not determined exist among the candidate members of the first combination?;(AA) Start;(BB,DD,FF,HH) No;(CC,EE,GG) Yes
Abstract:
PURPOSE: An apparatus and a method for providing a multicast service in a communication system are provided to transmit and receive channel status information (CSI) of a multicast service. CONSTITUTION: A control unit (513) determines temporarily a modulation and coding scheme (MSC) level application state in a current MCS level application section using a detection result of a feedback according to CSI of user equipment (UE) that is included in a multicast group. The control unit determines a final MCS level application state for the current MCS level application section using an MCS level application state of a previous MCS level application section and the temporarily determined MCS level application state. [Reference numerals] (511) Receiving unit; (513) Control unit; (515) Transmitting unit; (517) Storage unit
Abstract:
PURPOSE: A method for performing direct communications between terminals and the terminal supporting the same are provided to obtain synchronization between the terminals performing direct communications by improving a synchronization channel structure. CONSTITUTION: Direct communications is performed with one or more second terminals using allocated resources for the direct communications between terminals. The resources include a synchronous channel which is used for frequency synchronization and time synchronization between the terminals. The synchronization channel includes a synchronization channel preamble which is used for either preamble detection, time offset estimation, frequency offset estimation, or channel estimation. The synchronization channel preamble is either a first sequence repeating a basic pattern or a second sequence combining the basic pattern with a pattern multiplying the basic pattern by (-1). One or more OFDM(orthogonal frequency division multiplexing) symbols are used for transmitting the synchronization channel preamble.
Abstract:
PURPOSE: A relay method of a terminal for communication of an emergency terminal in a mobile communication system is provided to enable a terminal within cell coverage to set up an emergency call. CONSTITUTION: Terminals are converted in an emergency call relay standby mode(S310). The terminals are synchronized with a base station(S320). The terminals are switched into an emergency call relay mode(S340). The terminals transmit a resource request message to the base station(S350). The terminals transmits a connection setup message to the emergency terminal(S370). The base station and the emergency terminal transmit data through a relay terminal(S390).