Abstract:
Provided is an apparatus for providing a group communication service. The apparatus for providing a group communication service comprises: a group communication management module for controlling and managing group communication of multiple user terminals connected to an internal network standing alone from an external network; and a video/voice management module for receiving voices and videos for the group communication from microphones and cameras of the user terminals and manages the voices and videos, wherein the group communication management module includes: a packet management unit for generating packets used for controlling the group communication; a terminal searching unit for transmitting a group communication connection packet among the generated packets to a plurality of surrounding user terminals connected to the internal network, and searching for user terminals those can participate in the group communication based on response packets from the surrounding user terminals; and a group communication control unit for generating a communication group by transmitting a communication group generating packet among the generated packets to the searched participating user terminals, modifying or changing the communication group by transmitting a group communication control packet among the generated packets to the searched participating user terminals, and controlling the group communication of user terminals belonging to the communication group. [Reference numerals] (130) Group communication management module; (140) Video and voice management module; (150) video and voice output module; (AA) Mobile operation system
Abstract:
본 발명은 메시지 전송 주기 결정 방법이 개시된다. 이를 위한 메시지 전송 주기 결정 방법은, 이웃 노드의 전송 영역 내에 임의의 노드가 위치할 제1 확률을 결정하는 단계, 상기 임의의 노드가 상기 이웃 노드의 전송 영역을 벗어날 제2 확률을 결정하는 단계, 상기 제1 확률과 상기 제2 확률을 기반으로, 상기 임의의 노드의 전송 영역에 위치한 노드가 상기 임의의 노드의 전송 영역을 벗어날 제3 확률을 결정하는 단계 및 상기 제3 확률에 따라 상기 임의의 노드의 메시지 전송 주기를 결정하는 단계를 포함한다. 따라서, 네트워크 전체의 Hello 메시지 전송 주기를 변경하는 것이 아니라 각 노드의 Hello 메시지 전송 주기를 분산적으로 결정함으로써 노드의 이동성에 대해 적응적으로 Hello 메시지 전송 주기를 결정할 수 있고 네트워크 오버헤드의 증가를 최소화 하면서 이웃 노드탐색의 정확도를 향상시킬 수 있다.
Abstract:
PURPOSE: A relay node selecting method in a wireless ad-hoc network is provided to improve the whole performance of a network by reducing channel competition and collision probability. CONSTITUTION: A predetermined node renews a neighbor node list based on a message which is received from one or more the other nodes (S203). The predetermined node selects a 1 hop neighbor node having the most relay node selectors among one or more 1 hop neighbor nodes which are included in the renewed neighbor node list as a relay node (S209). The predetermined node receives a Hello message which respectively includes relay node selector number information from one or more the other node. The predetermined node renews the neighbor node list according to the relay node selector number included in the one or more Hello message. [Reference numerals] (AA) Start; (BB) Yes; (CC) No; (DD) End; (S201) Receive a Hello message including MSC information from neighboring nodes; (S203) Renew a list of the neighboring nodes regarding the MSC information; (S205) Align first hop neighboring nodes according to MSC values; (S207) Align the first hop neighboring nodes with the highest MSC values regarding the number of second hop neighboring nodes; (S209) Select the node with the highest MSC value and the largest number of the second hop neighboring nodes as a MPR node; (S211) Is at least one second hop neighboring node included ?; (S213) Remove information about the first and second hop neighboring nodes corresponding to a selected MPR on the list of the neighboring nodes
Abstract:
가상 백본 구성 방법 및 장치에 관한 것이다. 본 발명은 센서 노드가 자신을 대표 노드 및 연결 노드 중 어느 하나로 선언하는 단계, 센서 노드가 대표 노드로 선언된 경우, 대표 노드와 또 다른 대표 노드 사이의 경로에 포함되는 모든 연결 노드 중 전송범위가 나머지 연결 노드의 전송범위를 모두 포함하는 제1 연결 노드를 확인하는 단계, 제1 연결 노드가 존재하는 경우, 제1 연결 노드와 전송범위가 동일한 제2 연결 노드를 확인하는 단계, 제2 연결 노드가 존재하는 경우, 제1 연결 노드 및 제2 연결 노드 중 아이디 값이 작은 연결 노드를 가상 백본으로 설정하는 단계, 및 제2 연결 노드가 존재하지 않는 경우, 제1 연결 노드를 가상 백본으로 설정하는 단계를 포함한다. 본 발명에 따르면 무선 네트워크의 데이터 전송률이 높아지며, 에너지 효율성이 높아진다. 센서 노드, 가상 백본, 연결 노드
Abstract:
PURPOSE: A parameter extraction apparatus for a wireless sensor network simulator and a method thereof are provided to extract the parameter and use the extracted parameter in order to use wireless sensor network simulation. CONSTITUTION: In case an application program is inputted, a controller(130) schedules the application program by using state information stored in state information database. The controller transmits the scheduled application to sensor network test. The controller produces effective data among test results saved in the result information database. The controller extracts the parameter by using data.
Abstract:
A method for allocating a dynamic address using the communications of a neighbor terminal of the AD hoc network is provided to assign an overlapped and inherent address to a new terminal by using the communications of the neighbor terminal. A new terminal broadcasts an address block request message to neighbor terminals. An address block reply message is transmitted from the neighbor terminals. The new terminal transmits the address block acknowledgement message to 1 hop neighboring terminal(10a) in a normal state possessing the address block which the head of a family is great. The one-hop neighbor terminal transmits the address block complete message to the new terminal.
Abstract:
A system upgrade method in a multi-hop wireless network and a system thereof are provided to minimize the overhead caused by the topology of a network or a routing algorithm by transmitting updated data which is divided into the predetermined number of pieces based on at least one neighboring node which can be cooperated. A sync node transmits an update request message to a target node(S1). The target node broadcasts a collaboration request message to at least one neighboring node(S2). The neighboring nodes send a collaboration accept message to the sync node(S3). The sync node divides the update data into the predetermined number of packets, and then divided update data packets to the neighboring nodes(S4). The neighboring nodes send the divided update data packets to the target node(S6). The target node sends a response signal to a corresponding neighboring node(S7), and the performs the updating process(S8).