Abstract:
PURPOSE: A multimode apparatus capable of keeping providing a communication service and a communication method thereof are provided to enable a continuous communication service even when a base station is damaged. CONSTITUTION: A multimode apparatus comprises a radio frequency (RF) module and a processor (520) connected to the RF module. The processor, when being selected as an apparatus functioning as a relay because of a base station having a problem in a backhaul link, controls the multimode apparatus to set a first base station and a first relay link. The processor, when receiving a unlink request to terminate the first relay link from the first base station, controls the multimode apparatus to set a second base station and a second relay link or to configure and operate a private network or an independent network. [Reference numerals] (520) Processor; (540) Memory; (560) RF module
Abstract:
PURPOSE: A preamble transmission method, a synchronization method thereof, and an apparatus thereof are provided to supply a preamble capable of classifying a plurality of adjacent nodes. CONSTITUTION: A processor (710) detects a first preamble. The first preamble is transmitted through subcarriers which belong to a first preamble subcarrier set. The first preamble indicates the setup of a system bandwidth and a carrier wave. The processor detects a second preamble. The second preamble is transmitted through subcarriers belonging to a second preamble subcarrier set. The second preamble indicates a segment indicator used for obtaining a node indicator. [Reference numerals] (710) Processor; (720) Memory; (730) RF unit
Abstract:
PURPOSE: A distributed synchronization execution method is provided to execute in synchronization by considering the delay of the radio wave according to the distance between the nodes. CONSTITUTION: Signals including a reception point conversion period are received through a plurality of nodes(S600). A reception point receiving the signal through a plurality of the nodes is converted within the reception point conversion section in order to include a CP(Cyclic Prefix) section(S605). An FFT(Fast Fourier Transform) starting point is converted based on the converted reception point(S610). Each transmission point of the nodes based on the difference of value between the set FFT starting point and the converted FFT starting point is converted(S615). [Reference numerals] (AA) Start; (BB) End; (S600) Receive a signal; (S605) Convert a reception point; (S610) Convert an FFT starting point; (S615) Convert the reference point of a transmission timing
Abstract:
PURPOSE: An MAU(Medium Access Control) PDU(Protocol Data Unit) transmission method in a wireless mesh system is provided to transmit an MAU PDU by using an MAC PDU repeater. CONSTITUTION: A relay node receives a plurality of MAC PDUs from one or more transmission nodes(S310). The relay node generates a relay MAC PDU by classifying a plurality of the MAC PDUs(S320). The relay node transmits the relay MAC PDU to a reception node(S330). A header of the relay MAC PDU includes a CID(Connection Identifier) indicating the relay MAC PDU. A payload of the relay MAC PDU includes the MAC PDU. [Reference numerals] (S310) Receive an MAC PDU; (S320) Generate a relay MAC PDU; (S330) Transmit the relay MAC PDU
Abstract:
단말은 기지국에서 멀티캐스트 및 브로드캐스트 서비스 맵을 전송하는 주기보다 길게 설정된 맵 변동주기를 기지국으로부터 수신한다. 그리고, 수신한 맵 변동주기에 따라 기지국에서 전송하는 멀티캐스트 및 브로드캐스트 서비스 맵을 수신한다. MBS, 슈퍼프레임, MAP, SFH, SBCH
Abstract:
본 발명은 OFDMA(Orthogonal Frequency Division Multiple Access) 시스템에서 이동 단말에게 할당된 무선 자원 할당 및 무선 링크 제어를 수행하도록 하기 위한 OFDMA 시스템에서의 맵(MAP: Mobile Application Part) 시그널링(Signaling) 방법에 관한 것으로, OFDMA 시스템에서 사용자 단말에게 맵을 전송하는 맵 시그널링 방법에 있어서, 하나 또는 하나 이상의 맵에 대한 맵 헤딩을 생성시켜 생성된 맵 헤딩을 전송하고, 맵 헤딩에 의해 각 맵을 전송하도록 함으로써, 맵 전송을 위해 사용되는 무선 자원의 양을 감소시킬 수 있으며, 보다 적은 수신 단계를 사용하여 맵 정보를 수신할 수 있다. OFDMA, 맵, MAP, 시그널링, 슬롯
Abstract:
기지국이 단말에 대한 상향 링크 스케줄링을 수행하기 위해서, 기지국은 인접한 기지국들로부터 단말에 의한 상향 링크 간섭에 대한 정보를 수신하고, 상향 링크 간섭에 대한 정보를 단말에 전송하고, 단말로부터 피드백 채널을 통해 피드백 채널의 전송 전력에 대한 정보를 수신하고, 피드백 채널의 전송 전력과 피드백 채널의 수신 전력을 비교하여 전송 손실을 추정하고, 전송 손실을 반영하여 단말에 대한 상향 링크 스케줄링을 수행한다. 인접 섹터 간섭, OFDMA, 상향 링크 전력 제어
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 communication method of a base station and a terminal are provided to support communication between the base station and the terminal when the base station is not connected with an upper network by damage of a backbone network. CONSTITUTION: A base station transmits REQ(request) message to a terminal 1(S410). The terminal 1 transmits RSP(response) message(S420). The base station transmits the request message for communications setting request with the terminal 1 and the terminal 2 for communicating with the terminal 1(S430). The terminal 2 transmits the response message to the base station(S440). [Reference numerals] (AA) Back hole link; (BB) Local transmission
Abstract:
변조 및 코딩 방식(Modulation and Coding Schemes, MCS) 결정 장치는 복수의 단말이 속한 멀티캐스트 그룹에 복수의 피드백 채널을 할당한다. 그리고 멀티캐스트 그룹에 속한 각 단말로부터 복수의 피드백 채널 중 각 단말의 채널 상태 정보에 따라 선택된 하나의 피드백 채널을 통해 피드백 신호를 수신하며, 복수의 피드백 채널에서 수신한 피드백 신호로부터 멀티캐스트 데이터에 MCS를 결정한다. 피드백 채널, MCS(Modulation and Coding Selection), 채널 상태