Abstract:
PURPOSE: A network broadcast method using an MAC(Medium Access Control) unicast and a relay node is provided to minimize the loss of a data packet by preventing collision between an MPR(MultiPoint Relay) node and a source node. CONSTITUTION: A source node transmits a data packet to one or more first MPR nodes using an MAC unicast method. One or more first MPR nodes transmit the data packet to a second MPR node using the MAC unicast method. When one or more second MPR nodes are not existed within a first hop, one or more first MPR nodes transmit the data packet to a normal node using the MAC unicast method.
Abstract:
동일 주파수 대역을 사용하는 환경에서의 태그 인식 방법 및 이를 위한 NFC 장치를 제공한다. NFC 장치는 무선 채널의 사용여부에 따라 제1 동작 모드를 제2 동작 모드로 변경하고, 제2 동작 모드에서 태그 인식을 위한 슬롯 할당을 요청하며, 제2 동작 모드를 제1 동작 모드로 변경하여 할당된 슬롯에서 태그 인식 과정을 수행한다.
Abstract:
PURPOSE: A multicast data transmission system utilizing location information in a wireless ad-hoc network and data transmission method thereof are provided to prevent the creation of overlapped data and to promote network performance by effectively utilizing wireless resources. CONSTITUTION: A source node acquire information of neighbor nodes(S10). The source node selects one or more intermediate nodes locates one hop distance with the source node(S20). The source node selects the intermediate node which locates to the direction of a destination node as one or more relay nodes for transmitting data(S30). The intermediate node is selected based on the location information of the destination node and the location information of the intermediate node. The intermediate node transmits the data received from the source node to the destination node(S40). [Reference numerals] (AA) Start; (BB) End; (S10) A source node acquire information of neighbor nodes; (S20) A source node selects intermediate nodes; (S30) A source node selects the intermediate node and transmits data to a relay node by considering directivity; (S40) Each relay node transmits data to the destination node by transmitting the data to the relay node of a next hop
Abstract:
본발명은 RFID(Radio Frequency IDentification) 시스템과 NFC(Near Field Communication) 장치가공존하는환경에서제 1 NFC 장치의충돌회피방법을개시하고있다. 상기방법은, 제 1모드에서무선채널이현재사용중인지확인하는단계, 현재무선채널이사용중인경우, 상기 RFID 시스템의메시지를수신할수 있는제 2 모드로전환하는단계, RFID 리더(reader)로부터쿼리(query) 메시지를수신하는단계및 상기쿼리메시지에대응으로응답메시지를전송하는단계를포함하되, 상기응답메시지는 NFC 장치로부터송신되었음을지시하는정보를포함한다.