Abstract:
본발명은본 발명에따르는선박애드혹네트워크에서의 IP 자동할당방법은 (A)육상국과직접송수신이가능한원 홉선박국들이데이터링크계층에서생성된 IP 요청신호(AREQ) 및 IP 요청응답신호(AREP) 송수신을통해, 상기육상국으로부터중복되지않은 IP 블록을수신하는스테이지; (B)상기 IP 블록을받은원 홉선박국들이자신의 IP를결정하고상기육상국과데이터송수신을수행하고, 애드혹통신을통해간접적송수신이가능한멀티홉 선박국들의 IP 블록요청시 IP 제공자가되어 IP 블록을할당하는스테이지; 및 (C) 상기 IP 블록을할당받지못한멀티홉 선박국들이채널할당시복수개의 IP 제공자들의매체접근제어프레임을수신하는경우, 상기복수개의 IP 제공자들중 한 IP 제공자를결정하여 IP 요청신호(AREQ)를전송하고, 해당 IP 제공자는 IP 요청응답신호(AREP)를송신하는스테이지;를포함하는것을특징으로한다.
Abstract:
The present invention relates to an enhanced ad-hoc self-organizing time division multiple access (EASO-TDMA) type media access control method for a 2nd generation modem, comprising a first phase (FP) processing step including network entry, time slot scanning, neighboring ship (NS) checking, and path setting, and a normal phase (NP) processing step of transmitting a packet during an occupied time slot using a given path and receiving packets of neighboring ships during the other times. According to the present invention, since the number of time slots of a ship is set according to the number of transmission nodes by using a route table, and a time slot is allocated to communicate to a destination during one frame, a transmission delay time can be reduced and occurrence of an application timeout can be prevented, and thus, wireless communication with a land based station, as well as communication between marine neighboring ships, can be more stably performed.
Abstract:
The present invention relates to a phase tracker for three-phase power. The phase tracker includes a two-phase conversion unit which receives signals of different phases from each output terminal outputting a three-phase signal from a three-phase AC power and outputs a third signal in which a first and a second signal, which are converted into a two-phase vector signal on rectangular coordinates, and the three-phase signals are added to each other; a first adder which outputs the sum of the first signal outputted from the two-phase conversion unit and the third signal; a multiplexer which outputs by multiplexing the imaginary part of a fourth signal to which a first compensation value set in the second signal is multiplied and the real part of the output signal from the first adder; an error calculation unit which receives the output signal from the first multiplier and calculates a phase error value; a phase calculation unit which calculates three-phase values from the output signal from the error calculation unit; and a complex value extraction unit which extracts a complex value from the output signal from the phase calculation unit and outputs the values as the first feedback signal to the first multiplier. According to the described phase tracker for three-phase AC, it is possible to reflect phase differences between the three phases, and accordingly track the phases accurately.
Abstract:
A packet processing method in a data link layer for a ship ad hoc network (SANET), according to the present invention, is configured to comprise the steps of receiving a physical layer message from the physical layer; extracting a MAC packet from the physical layer message; referring a route table determined by a network layer and verifying an address header of a network packet included in the MAC packet; and processing the MAC packet based on the route table and the address header.
Abstract:
본 발명은 다중 홉 선박 통신망 기반의 자원할당 및 전송률 제어 방법에 관한 것으로, 보다 상세하게는 다중 홉 선박 통신망에서 각 홉 영역에 존재하는 선박의 분포 또는 선박들의 전송률에 기초하여, 부프레임(Sub-frame)의 크기를 설정하고 전송률을 제어하는 방법에 관한 것이다. 특히, 본 발명은 육상기지국이 각 홉 영역의 선박들에 대한 부프레임의 크기를 설정하고, 각 홉 영역에 존재하는 선박들이 과부하 여부를 판단하여 전송률을 제어함으로써, 전체 시스템의 성능을 크게 향상시킬 수 있으며, 다중 홉 선박 통신망에서의 효율적인 자원의 분배 및 사용이 가능하도록 함으로써, 신속하고 안정적인 데이터 전송이 가능하도록 하는 효과가 있다. 따라서, 다중 홉 통신 분야 및 해상 선박 통신 분야에서 경쟁력 및 신뢰성을 향상시킬 수 있음은 물론, 본 발명에 의한 기술을 기반으로 하여 다양한 통신분야에서도 동일 내지 유사한 효과를 제공할 수 있다.
Abstract:
The present invention relates to a time parameter determining method of a time division multiple-access media access control protocol for a long range underwater network in which a command ship prevents the generation of reception collision between the command ship and cluster heads and performs effective two-way communication. For this, the command ship (CS) sets the time parameter according to the position of a different cluster head (CH) into an initial stage, a normal stage, and a final stage and controls the connection of the entire channel. The CH determines the time parameter of media access control protocol connected to the channel based on the time parameter provided from the CS. The time parameter determining method of the time division multiple-access media protocol comprises: a step of determining a beacon signal time offset of a CH j in a hop h and sub-hop k; and a step of determining a response signal transmission time offset of the CH j in the hop h and sub-hop k. [Reference numerals] (AA) Initial stage; (BB) Bus bar mac (MAC); (CC) Cluster head mac (MAC); (S210) Time parameter setting; (S220) Beacon signal transmission; (S230) Beacon signal transfer; (S240) Response signal transmission; (S250) Response signal transfer; (S260) Route setting; (S270) Route setting confirmation
Abstract:
본 발명에 따르면, 해상 이동체들간의 네트워크를 위한 노드에서 수행되는 애드혹 통신 방법에 있어서, 노드 주변에 다른 노드가 존재하는지 여부 및 노드의 가용 채널 상황에 기초하여 메시지를 송수신하기 위한 통신 모드를 설정하는 단계, 메시지에 포함된 수신 대상 정보 및 메시지의 타입에 기초하여 메시지를 송수신하기 위한 설정을 하는 통신 제어 설정 단계, 설정된 통신 모드 및 통신 제어 설정 단계에 따라 메시지를 송수신하는 단계를 포함하는 애드혹 통신 방법 및 노드를 제공할 수 있다.