Abstract:
PURPOSE: A cell management method and a handover method are provided to increase the accuracy of handover generated in a boundary area of a cell by reducing the size of a cell management message including the information of a neighboring base station. CONSTITUTION: A serving base station broadcasts a neighboring base station notification message to a terminal. The neighboring base station notification message includes the information of a sector, in which a terminal is located, and the information of a base station which locates in a boundary area of a cell. A neighboring base station provides cell tier information to the terminal. When a reception signal of the serving base station is maintained during timeout time set as a predetermined value, the terminal handovers data to an adjacent cell. The predetermined value is smaller than a value except for a variable hysteresis margin of handover set from the reception signal of the neighboring base station. [Reference numerals] (AA) Sharing femtosystem network topology; (BB,JJ) Terminal analyzes cell signals; (CC) Cell signal quality(time > hysteresis & serving cell Hysteresis considering overlapped cells); (NN) Terminal and base station determine handover(handover as rank 2); (OO) IEEE 802. 16e, FBS handover;
Abstract:
PURPOSE: A method for communication by using a relay communication protocol for improving QoS performance in a WiMedia Distributed MAC communication system is provided to reserve another indirect link via a relay node besides a direct link in order to maintain QoS resources reserved in a collision target device. CONSTITUTION: A relay request reservation state code is transmitted between two nodes so that a reservation owner node requests a reservation to a relay node. The relay request reservation state code indirectly notifies that there is a DRP reservation request between the relay node and the reservation owner node to a reservation target node. A relay notification reservation state code is used for notifying that data is transmitted to the reservation target node through the relay node. [Reference numerals] (AA) Value; (BB) Code; (CC) Meaning; (DD) Requesting relay transmission to a relay node; (EE) Notifying that data is transmitted to a target node through a relay node; (FF) Accepted DRP resource reservation request for the corresponding relay transmission;
Abstract:
PURPOSE: An Alamouti STBC applying method for enhancing performance of an offshore wind power radio communication control system is provided to apply a MIMO Alamouti STBC(Space-Time Block Coding) to a radio communication based control system, thereby improving transmission quality and reliability of the control system. CONSTITUTION: An Alamouti STBC applying method comprises the steps of: building multiple antennas using the overlay network technology; applying MIMO Alamouti STBC for optimal communication of the multiple antennas. When a control system operates normally, the control system processes valid data by interworking an up line with nets of odd numbers and a down line with nets of even numbers. When failing in forming a wireless link of the up line to a radio device in the front car of a train or detecting an error, the control system reads data of the radio device in the tail car for processing the data as valid data.