Abstract:
지능형 MAC(Multiple Access Communication) 구동 장치 및 방법이 개시된다. 본 발명에 따른 지능형 MAC 구동 방법은 적어도 하나 이상의 RAT(Radio Access Technology)와 무선망을 연결하는 단계, 상기 RAT의 가용자원 및 무선상태를 포함하는 RAT 정보를 수집하는 단계, 적어도 하나 이상의 연결대상 서비스의 QoS(Quality of Service)를 확인하는 단계, 상기 연결대상 서비스의 우선순위를 결정하여 우선 연결대상 서비스를 선정하는 단계, 상기 QoS 및 상기 RAT 정보를 기반으로 상기 우선 연결대상 서비스를 수행하기 위한 연결 RAT를 결정하는 단계 및 상기 연결 RAT를 통하여 상기 우선 연결대상 서비스를 개시하는 단계를 포함한다.
Abstract:
In a wireless communication system configured to have a plurality of nodes, any one of the nodes receives a broadcast message from the nodes adjacent thereto, and calculates a reception time point variation that is difference between a time point when the message is received for each of the adjacent nodes and a time point when the preceding message is received. The reference time of the node is corrected based on the variation calculated for each of the adjacent nodes.
Abstract:
A method for controlling time of reference (Tr) in a wireless mesh network according to the present invention, which is performed by a time-of-reference control system, comprises: a network entry step in which an entry node trying an entry into a network synchronizes its own time of reference with time of reference of a sponsor node of the wireless mesh network; an initial holdoff time step in which adjusts a location of the time of reference to change the time of reference fitted for the sponsor node to the time of reference within the network for an initial holdoff time period before transmission of a broadcast message ; and a periodic ranging step of correcting an accumulated error of the time of reference.
Abstract:
An embodiment of the present invention provides a discovery signal which is broadcasted from a first terminal engaging in direct communication to a wireless channel. The discovery signal include: a first field displaying whether the discovery signal is a terminal detection signal or a service detection signal; and a second field including either of the terminal identifier information of the first terminal or the service information of a service provided by the first terminal according to the first field value.
Abstract:
Disclosed are a communication device and a data transmission method of the communication device. Upon receiving a feedback message which corresponds to data failed to be received by each communication receiver apparatus, the communication device generates a feedback matrix corresponding to the feedback message, selects candidate transmission data from the feedback matrix, and executes the network coding of the candidate transmission data to retransmit the data to each communication receiver apparatus. [Reference numerals] (S310) Receiving a feedback message; (S320) Updating a feedback matrix; (S330) Rearranging the feedback matrix according to priorities; (S340) Selecting a part of the feedback matrix to be used for transmission if candidate transmission data is greater than available transmission resources; (S350) Generating retransmission data in the selected part of the feedback matrix; (S360) Adding data to be transmitted if the generated retransmission data is less than the available transmission resources; (S370) Dividing the final retransmission data into a transmission unit; (S380) Adding a header to every transmission unit and transmitting the same
Abstract:
PURPOSE: A resource allocating device for the interference evasion of a wireless communication system and a method thereof are provided to prevent receiving failure caused by interference generated by incomplete synchronization with neighbor nodes in a wireless mesh network. CONSTITUTION: An allocation control unit (230) selects a simultaneous receiving impossibility node and a simultaneous transmission impossibility node about each hop node of a node by using a signal quality value of each hop node. The allocation control unit excludes a transmission-expected resource of the simultaneous transmission impossibility node from a transmission resource during the transmission resource allocation of the node. The allocation control unit excludes the transmission-expected resource of the simultaneous transmission impossibility node from a receiving resource of the node during the receiving resource allocation of the node. [Reference numerals] (210) Transmitting unit; (220) Receiving unit; (230) Allocation control unit
Abstract:
PURPOSE: A data communication method between the wireless nodes is provided to simplify a calculation procedure of a beam-forming matrix by improving feedback information. CONSTITUTION: A reception node generates channel data by measuring channel information(S201). The reception node transmits the channel data to a transmission node. The transmission node generates a transmission beam-forming matrix and a reception beam-forming matrix by using the channel data(S203). The transmission node transmits the transmission beam-forming matrix and the reception beam-forming matrix to the reception node(S205). The reception node verifies the reception beam-forming matrix by using the transmitted transmission beam-forming matrix. The reception node gives feedback on a verification result to the transmission node. [Reference numerals] (AA) Start; (BB) No; (CC) Yes; (DD) End; (S201) Reception node measures channel information, generates channel data, and transmits the same to a transmission node; (S203) Transmission node generates a transmission beam-forming matrix(V(j)) and a reception beam-forming matrix(U(i)) by using the channel data; (S205) Transmission node transmits the V(j) and the U(i) to the reception node; (S207) Reception node self-generates a reception beam-forming matrix(U'(i)) using the V(j); (S209) Is the U(i) equal to the U'(i)?; (S211) Transmission node transmits data to the reception node by applying the V(j); (S213) Reception node transmits the U'(i) to the transmission node; (S215) Transmission node re-generates a V(j) by using the U'(i)
Abstract:
PURPOSE: A network management method and a device thereof are provided to support a restoration for a connection using a link by rapidly connecting the link to a neighbor mesh node. CONSTITUTION: When an entry node entering into a transmission range is sensed, a neighbor node management unit(1100) selects the entry node and a mesh node as an agent node including a neighbor node from a plurality of neighbor nodes. The neighbor node management unit forms a link with the entry node through the agent node. A transmission and reception unit(1300) receives a message from the plurality of the neighbor nodes. The transmission and reception unit transmits the received message to the neighbor node management unit. [Reference numerals] (1100) Neighbor node management unit; (1200) Path management unit; (1300) Transmission and reception unit
Abstract:
PURPOSE: A smart home server operating system and an operating method thereof are provided to collect user content files by analyzing a photographed face and a recorded voice of a user based on content files. CONSTITUTION: A content file is received from an external terminal building a keyword database storing keyword information corresponding to users(201). The voice recognition of the content file is performed(202). The keyword information related to the content file is extracted from the keyword database based on a result of the voice recognition. The extracted keyword information is set as a tag of the content file. If the tag of the content file is set, the content file is classified into personal data of a user corresponding to the keyword information(204). [Reference numerals] (200) Audio data; (201,211) Upload; (202,205,212) Voice recognition; (203,206,213) Generation of user voice information; (204,207,214) Automatic classification; (AA) External terminal; (BB) Smart home server system; (CC) Filming; (DD) Video data; (EE) Photographing