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: A PFMIPv6 for the high speed handover of ship communication and an effective interworking method of a WLAN(Wireless Local Area Network) are provided to rapidly execute handover by utilizing a probe request message as a handover trigger and transceiving information which is necessary for handover. CONSTITUTION: An MN(Mobile Node) transmits a probe request message for searching neighbor APs(Access Point), and a pMAG(previous Mobile Access Gateway) executes buffering for preventing the packet loss of the MN. The pMAG broadcasts an MN-ID, HNP(Home Network Prefix), and LMAA information to neighbor MAG(Mobile Access Gateway). A new MAG stores the broadcasted information in a BUL(Binding Update List).
Abstract:
본 발명은 고속 무선개인통신망에서 충돌회피를 위한 다중 채널 스케쥴링 방법에 관한 것으로서, 본 발명에 따른 고속 무선개인통신망에서 충돌회피를 위한 다중 채널 스케쥴링 방법은 여러 WSS 네트워크들이 공존하는 무선통신 환경에서 발생할 수 있는 데이터 충돌을 효율적으로 해결하기 위해, 새로운 유휴 채널을 검색하여 새롭게 비콘 프레임 및 데이터 프레임을 전송할 수 있도록 한다. 본 발명에 따르면, 유효구간 동안 유효 채널 스캔을 수행하여 실제 무선환경에 대한 정보를 제공함으로써, 가용 무선 채널의 이용성을 극대화시킬 수 있다. 또한, 데이터 충돌이 발생한 이후에 채널 스캔을 하는 것이 아니라 평상시 유효 채널을 스캔함으로써, 빠르게 유효 채널로의 이동이 가능하며, 데이터 충돌로 인한 네트워크 단절을 최소화시킬 수 있다.
Abstract:
PURPOSE: An SoQ(Service of Quality) based cooperative communication protocol implementation method is provided to connect an installed system by having compatibility with a WiMedia D-MAC(Distributed-Medium Access Control) standard technology without modifying a specific system. CONSTITUTION: In case it is possible to reserve MAS S-R and MAS R-T for random relay nodes, a reservation host node sets up a reservation reason code of a DRP IE for MAS S-T as relay approval and transmits the reservation reason code to a reservation target node. The reservation host node sets up a reservation detail state code of the DRP IE for MAS S-R as relay request and transmits the reservation detail state code to the relay node. The relay node sets up the reservation detail state code of the DRP IE for MAS R-T as relay notification and transmits the reservation detail code to the reservation target node. In case the reservation detail code of the DRP IE received from the relay node and the reservation target node is relay approval, the reservation host node transmits data through the relay node.
Abstract:
PURPOSE: A buffer management method in a mobile IP(Internet Protocol) network for ocean telematics is provided to manage TCP flows which passes through a congested base station by using a base station packet buffering method. CONSTITUTION: It is determined whether a portable terminal is moved to a congested base station of a sub-network. When the portable terminal is moved to the congested base station, influence on TCP flows is confirmed by considering hand-off arrival distribution in the congested base station. The TCP flows passes through the congested base station by using a predetermined base station packet buffering method. A buffer is managed by a drop-tail method and an RED(Random Early Detection) method according to the hand-off arrival distribution.
Abstract:
PURPOSE: A physical layer based relay cooperative communication method for an MAC(media access control) protocol based ship building distribution system is provided to stably transmit information within a distribution system by providing an authenticated standard for communication between the RFID(radio frequency identification) reader nodes. CONSTITUTION: A relay request reservation detail state code, a relay notification reservation detail state code, and a relay approval reservation detail state code are designated. The relay request reservation detail state code is transmitted for enabling a reservation subject node to request a DRP(distributed reservation protocol) to a relay node. The relay notification reservation detail state code is used for enabling the reservation subject node to notify the relay transmission of data to a reservation target node. A relay transmission process is executed when the relay node and the reservation target node transmit the relay approval reservation state code.
Abstract:
본 발명은 WiMedia 기반의 무선 네트워크들에서 멀티미디어 데이터의 프래그먼트(fragment) 수신 시 맥 서비스 데이터 유닛(MSDU: MAC Service Data Unit)의 프래그먼트 손실 여부를 판단하는 단계, 상기 MSDU의 프래그먼트가 손실된 경우, 앞서 수신된 상기 프래그먼트로부터 기간 필드(duration field)를 추출하는 단계, 및 상기 기간 필드에 설정된 시간 동안, 전력 모드를 액티브 모드에서 저전력 모드로 전환하는 단계; 포함하는 WiMedia 네트워크에서 효율적인 에너지 멀티미디어 스트리밍 방법에 관한 것이다.