Abstract:
서버장치 및 이를 이용한 데이터 통신 방법이 개시된다. 개시된 서버장치는 상기 서버장치와 데이터 통신을 수행할 수 있는 다수의 노드를 탐색하는 탐색부; 및 상기 탐색된 다수의 노드의 개수에 기초하여 상기 다수의 노드와의 데이터 통신에 이용되는 통신 프레임 내의 데이터 송신을 위한 타임슬롯(데이터 타임슬롯)의 개수를 설정하는 설정부를 포함한다.
Abstract:
본 발명은 애드 혹 무선 네트워크에서 경로 안정성 제공을 위한 멀티 홉 자원 수집 기반 라우팅 경로 설정 방법에 관한 것으로, 각 노드는 일정한 주기를 가지고 “Hello” 메시지를 이웃 노드에게 브로드캐스트하는 과정을 반복하면서 멀티 홉 자원을 수집하는 제10단계(S10)와; 상기 “Hello” 메시지를 수신한 각 노드는 자신이 수집한 “Hello” 메시지의 신호 세기를 바탕으로 링크들의 신호 세기 산술 평균값과 신호 세기 편차를 이용하여 하나의 정량화된 경로 안정성 값을 산출하는 제20단계(S20)와; 영역 내부 경로 탐색 과정과 영역 외부 경로 탐색 과정을 통해 송신 노드에서 수신 노드까지의 가장 안정된 경로를 찾는 라우팅 경로를 탐색하는 제30단계(S30)를 포함한다. 따라서, 본 발명은 “Hello” 메시지 필드 내에 자원 정보를 포함하여 멀티 홉 릴레이 방식으로 자원 정보를 수집함으로써 네트워크 오버헤드의 증가 없이 멀티 홉 자원 수집이 가능하며, 멀티 홉 자원 수집을 통하여 얻어진 멀티 홉 링크들의 신호 세기를 기반으로 각 링크별 신호 세기의 산술 평균값과 신호 세기의 편차를 이용하여 라우팅 경로를 형성할 수 있는 효과가 있다. 애드 혹, 무선 네트워크, 멀티 홉, 라우팅 경로
Abstract:
본 발명은 이동통신 시스템에 관한 것으로, 보다 상세하게는 이동통신 시스템의 기지국에서 무선자원 할당을 위한 스케줄링(Scheduling) 방법에 관한 것으로, 상기 방법은 사용자 단말을 타겟으로 하는 패킷을 전송받아 사용자별 전송대기 큐에 저장하는 단계와; 사용자별 전송대기 큐의 패킷 유입량에 의한 패킷누적량과 채널영향에 의한 사용자별 평균 전송률을 산출하여 이를 무선자원 할당을 위한 우선순위함수식에 반영하여 얻어진 값들에 기초하여 무선자원 할당하는 단계;를 포함함을 특징으로 한다. 이로써 본 발명은 무선 채널 상황 뿐만 아니라 각 사용자별 단위시간당 패킷 유입량을 고려하여 이에 비례하게 무선 자원 할당함으로써, 높은 시스템 전송률과 사용자의 트래픽에 대한 비례 공평성(Proportional Fairness)을 함게 제공할 수 있다. 무선자원, 할당, 패킷 유입량.
Abstract:
PURPOSE: A media access control structure for a visible light wireless communication of an FDD base and a control method thereof for minimizing the collision probability are provided to apply a transmission starting offset time of uplink and downlink transmission frames through visible wireless communication. CONSTITUTION: An AP(Access Point)(10) and a plurality of fixing-type terminals(20) are formed into uplink and downlink frames synchronized by a VLAN transceiver(30). One AP and a plurality of fixing-type terminals are composed of a full duplex frame transmission structure. An uplink is composed of data phase for data uplink data transmission.
Abstract:
PURPOSE: A scheduling method for offering a proportional fairness toward the traffic of a user for a mobile communications system is provided to implement high system transmission rate by allocating wireless resources. CONSTITUTION: A transmission standby queue(101) receives a packet for a UEs(User Equipments). The latency queue temporarily stores the received packets according to each user. A packet scheduler(100) receives wireless CQI(Channel Quality Information) which is necessary for the radio resource assignment from user terminals. The packet scheduler receives the packet inflow information per the unit time from the latency queue. The packet scheduler assigns radio resources to user terminals.
Abstract:
PURPOSE: A down link scheduling method considering the priority user prevalence in the CR communication system is provided to reduce the transmission fail due to the appearance of the priority user. CONSTITUTION: A resources block which can be available is detected(S102). The information of the resources block uses the prevalence information of the priority user and the channel quality information which is from the CR(Cognitive Radio) node and is collected(S103). The resources select the CR node selected in consideration of the channel maximum transmission capacity and average transmission rate of CR nodes and resources block and are allocated(S104). The CR node scheduled in the resources block is identified(S105). In case the scheduled CR node as described above, the average transmission rate for the scheduling at the next resources block is updated with computation(S106).
Abstract:
Disclosed are a method and apparatus for authenticating an unknown user in a social network service. The disclosed method for authenticating an unknown user comprises the steps of: receiving, from a terminal device of an unknown user, an access request message including identification information of the unknown user and a friend list of the unknown user in a social network service; searching the same friend as a friend of the unknown user in the social network service in the friend list of the unknown user; transmitting, to a terminal of the same friend, an authentication request message including the identification information of the unknown user; receiving, from the terminal of the same friend, an authentication confirmation message as a response to the authentication request message; and authenticating the unknown user in response to the reception of the authentication confirmation message. [Reference numerals] (210) User A; (230) User F; (S400) Receive an access request message transmitted from a user U; (S402) Decode the access request message; (S404) Extract a friend list of the user U and a first cryptogram from the decoded access request message; (S406) Decode the first cryptogram; (S408) Determine whether friend lists are identical to each other; (S410) Search whether the same friend as a friend of the user A exists in the friend list of the user U; (S412) Transmit an authentication request message; (S414) Decode the authentication request message; (S416) Extract identification information of the user A, identification information of the user U, and a second cryptogram from the decoded authentication request message; (S418) Decode the second cryptogram; (S420) Determine whether the identification information of the users are identical to one another; (S422) Search whether the identification information of the user F exists in one's own friend list; (S424) Transmit an authentication confirmation message; (S426) Authenticate the user U
Abstract:
Disclosed are a mobile terminal capable of positioning, a positioning server, and a positioning method for the mobile terminal using the same. The disclosed positioning server includes: a control unit which controls transmission of visible ray signals from a plurality of visible ray transmitting devices; and a position calculation unit which calculates the position of the mobile terminal based on reception time data of the visible ray signals transmitted from each of the visible ray transmitting devices. The control unit controls the visible ray transmitting devices to consecutively transmit visible ray signals for a first time interval while not allowing the transmitting points of time of the visible ray signals from each visible ray transmitting device to be overlapped. The reception time data of the visible ray signals to the mobile terminal includes data at a certain point of time included in a time section when a visible ray signal of which the reception intensity is equal to or greater than a preset threshold value is received. [Reference numerals] (AA) Reception intensity; (BB) Protection time section (visible ray transceiving device a); (CC,GG) First reception time section; (DD,HH) Second reception time section; (EE) Reception time section (visible ray transceiving device a); (FF) Protection time section (visible ray transceiving device b); (II) Reception time section (visible ray transceiving device b); (JJ) Threshold value; (KK) Time (sampling index)
Abstract:
PURPOSE: A device and method for changing the light-emission angle of an optical transmitter in a visible light wireless communications system are provided to enable the light-emission angle of the optical transmitter to be changeable. CONSTITUTION: A reception part (601) receives signal reception strength of signal-to-noise ratio (SNR) information, which is transmitted from an optical receiver and measured at each of multiple optical transmitters, and the SNR information from the multiple optical transmitters. A determination part (603) determines whether the SNR information is bigger than a predetermined threshold value. If the SNR information is smaller than the threshold value, a control part (605) changes the light-emission angle of at least one among the multiple optical transmitters by using the signal reception strength. [Reference numerals] (110) Optical transmitter; (120) Optical receiver; (601) Receiving unit; (603) Judging unit; (605) Control unit; (607) Data transmitting unit