Abstract:
연계된 수신기들로부터 궤환되는 채널 상태 정보에 따라 해당 수신기에 대한 전송률을 결정하여 결정된 전송률로 패킷을 전송하는 송신기들로 구성되는 무선통신시스템에서, 본 발명에 따른 통신 방법에서는 상기 송신기가 상기 수신기들로 전송될 패킷들을 전송률 별로 그룹화하여 동일 전송률 패킷 들로 구성되는 프레임들을 생성하고, 상기 서로 다른 전송률을 갖는 프레임들을 하나의 전송 버스트(Tx Burst)로 응집하여 전송한다. 본 발명의 패킷 응집 통신 방법에서는 송신단말이 피드백 되는 채널 정보를 통해 수신단말들의 전송률을 결정하고 동일한 전송률을 갖는 수신단말들로 전송될 패킷들을 응집시켜 패킷그룹을 형성하고 서로 다른 전송율을 가진 패킷그룹들을 다시 하나의 MRA 버스트로 구성하여 전송함으로써 효율적인 자원 관리가 가능하다. 패킷응집(packet aggregation), 맥프로토콜데이터유닛(MPDU), 물리계층프로토콜데이터유닛(PPDU)
Abstract:
PURPOSE: A one-chip direct conversion transceiver for reducing a DC offset and its manufacturing method are provided to reduce power consumption by effectively preventing signal leakage with a positive hole. CONSTITUTION: A positive hole(130a) is formed by penetrating the center of a substrate(100). The positive hole(130a) is filled with a conductive plug(130). A mixer part(110) and a local oscillator(120) are provided at one and the other side of the subscriber(100) centering on the positive hole(130a), respectively. The first dielectric layer(140), a shield ground surface(150) and the second dielectric layer(142) are sequentially stacked on the subscriber(100). The first via hole(h1) is formed by penetrating the first and second dielectric layers(140,142) to expose the mixer part(110). The second via hole(h2) is formed to expose the local oscillator(120). The first and second via holes(h1,h2) are filled with the first and second conductive plugs(C1,C2). The first line(160) is formed on the second dielectric layer(142) to connect the first and second conductive plugs(C1,C2). The mixer part(110) and the local oscillator(120) are connected by the first conductive plug(C1), the first line(160) and the second conductive plug(C2). The third, fourth and fifth dielectric layers(144,146,148) are sequentially stacked on the second dielectric layer(142) to cover the first line(160).
Abstract:
PURPOSE: A method for retransmitting reliable multicast data by grouping wireless terminals through wireless communication and a device therefor are provided to group wireless terminals in order to compensate for packet loss generated when transmitting multicast data under wireless communication environment, and to retransmit the data in grouped terminal units, thereby supplying reliable retransmission mechanism. CONSTITUTION: An AP(Access Point) groups wireless terminals based on signal strength information from the wireless terminals and a distance to the wireless terminals(410). The AP selects repeaters one by one, which retransmit multicast packets by group(420). The AP sets an order of performing a retransmission process between the selected repeaters(430). The AP makes an MTU(Multicast packet Train Header)(440). The AP transmits the MTU, and carries out the retransmission process according to the set order(450). The MTU consists of multicast train ID information, information on the number of groups, information on the number of multicast packets, and FEC(Forward Error Correction) information.
Abstract:
PURPOSE: A method for dynamically managing a packet segment threshold value reflecting radio channel characteristics is provided to reduce a packet transmission error by continuously monitoring a state of a radio channel and dynamically changing a segment threshold value according to a change in a temporal and spatial channel state. CONSTITUTION: It is determined whether a packet has been transmitted(310). If a packet has been transmitted, it is determined whether an ACK message has been received(320). Response message reception signal strength information is received(330). If the ACK message has been received, a segment threshold value controller monitors a reception signal of every packet and determines a signal strength level(340). If the ACK message has been successfully received, a segment threshold value is increased according to the signal strength level(350). If the ACK message has not been received, it is determined that a packet has been lost and the segment threshold value is reduced to a certain minimum value(340). If a packet is not transmitted but received, a signal strength level is determined(360).
Abstract:
지능형 옷장의 외부에 설치된 사용자 인터페이스부를 통해, 사용자와의 인터랙션에 따라 지능형 옷장을 제어하고 관련 정보를 제공받는 장치 및 방법이 개시된다. 본 발명의 지능형 옷장 관리장치는, 사용자에게 제공되는 정보와, 사용자와의 인터랙션을 수행하고 그에 따른 결과를 표시하는 사용자 인터페이스부; 의류의 입출고 관련정보를 포함하는 통합의류정보를 입력받는 입출고정보 입력부; 및 상기 사용자 인터페이스부 및 입출고정보 입력부를 제어하며 상기 통합의류정보를 관리하는 제어부를 포함하는 것을 특징으로 한다. 이에 의해 지능형 옷장을 사용하여 의류를 보다 효율적으로 관리할 수 있어 코디 정보, 의류이력관리 등을 통합 관리할 수 있으며, 날씨, 행사, 취향에 따라 사용자에게 적절한 옷을 추천할 수도 있어 옷장 이용의 편리성을 도모할 수 있다. 옷장, 디스플레이
Abstract:
PURPOSE: A power transmission beam-forming apparatus and method thereof are provided to remove electromagnetic interference to a peripheral device which does not receive power. CONSTITUTION: An information receiving unit(210) receives a wireless power transmission request signal from a target receiver. One or more sub transmission units(220) are prepared in a state that wireless power is transmitted in case a wireless power transmission request signal is received. One or more sub transmission units transmits wireless power which is received from a main transmission unit(230) to the target receiver. The main transmission unit transmits wireless power to the target receiver through the sub transmission unit.
Abstract:
본 발명에서는 패킷의 수신 결과를 통보하는 역할을 충실히 수행하면서도 상시 수신 결과에 따른 정보가 기록되는 영역(비트맵 필드)의 크기를 최적화할 수 비트맵 구조를 제안한다. 이를 위해 송신측에서는 연속하여 전송할 SN 레벨 패킷들의 수와 최대 조각 패킷의 수를 수신측으로 제공한다. 수신측에서는 연속하여 전송할 SN 레벨 패킷들의 수와 최대 조각 패킷의 수에 의해 최적화된 비트맵 구성 방식을 결정한다. 그리고 결정된 비트맵 구성 방식에 의해 각 조각 패킷들에 대한 수신 결과를 송신측으로 보고한다. ARQ, Block ACK Bitmap, SN level packet, fragmented packet, Sequence Number, Fragmentation Number, Block ACK Request Frame, Block ACK Frame
Abstract:
A self-calibration apparatus in a wireless transceiver and a method thereof are provided to minimize the production cost of mobile terminals by easily calibrating DC offset and imbalance between I and Q channels by using the transceiver and receiver of a mobile terminal, without adding a special circuit or additional power consumption. A DSP(Digital Signal Processor)(210) inputs test signals to the first DAC (220-I) and the second DAC(220-Q) sequentially in order to estimate DC offset characteristics of the I and Q channel paths of an RX stage. The first DAC(220-I) converts the sequentially inputted signals into analog signals and inputs them to the first LPF(Low Pass Filter)(230-I). The second DAC(220-Q) also converts the sequentially inputted signals into analog signals and inputs them to the second LPF(230-Q). The analog signals respectively are filtered through the LPFs(230-I,230-Q), and the filtered signals respectively are converted into RF TX signals through the first mixer(240-I) and the second mixer(240-Q). The RF TX signals contain a component of "ЋŒÐ‹0". The RF TX signals containing the ЋŒÐ‹0 component are transferred to the Rx stage through a text path formed by the first and second switches (SW#1/#2). As a resonance circuit(250) which exists on the test path removes a component of "Ћ +Ћ0" among the ЋŒÐ‹0 component, only a component of "Ћ-Ћ0" exists in the RF TX signals transferred to the RX stage through the second switch(SW#2).