Abstract:
PURPOSE: An apparatus and a method for transmitting an interworking signal in a wireless communication system are provided to reduce overhead due to adjacent cell information transmission. CONSTITUTION: A femto base station(1204) transmits an interworking signal through the operating frequency of a macro base station(1202). The terminal gets information for the handover to the femto base station. The terminal decides to begin handover. The terminal transmits a handover request signal to the macro base station using identification information of the target femto base station.
Abstract:
본 발명은 코드북 기반의 빔포밍 시스템에서 다중 사용자 간섭 제거 장치 및 방법에 관한 것이다. 본 발명에 따른 코드북 기반의 빔포밍 시스템에서 다중 사용자 서비스를 위한 송신 장치는, 피드백 정보를 이용해서 서비스를 제공할 사용자들의 송신 데이터들 각각을 해당 가중치 벡터와 곱하여 빔형성된 사용자 신호들을 발생하는 빔형성부와, 상기 사용자들의 각각에 대하여 다른 사용자들의 가중치 벡터들과 직교하는 널스페이스(null space) 행렬을 생성하는 널스페이스 생성부와, 상기 빔형성부로부터의 빔형성된 사용자 신호들 각각을 상기 널스페이스 생성부로부터의 해당 널스페이스 행렬에 투영(projection)하여 복수의 안테나들을 통해 송신하는 투영부를 포함한다. 이와 같은 본 발명은 코드북 기반의 빔포밍 시스템에서 전송되는 다중 사용자 신호들이 서로 직교성(orthogonality)을 유지할 수 있기 때문에, 다중 사용자 간섭에 의한 성능 열화를 제거할 수 있는 이점이 있다. 빔포밍, 코드북, 가중치, 다중 사용자 간섭, 직교화
Abstract:
PURPOSE: An automatic interference control device of a broadband wireless communication system and a method thereof for increasing the resource management performance are provided to control and measure the interference of an adjacent cell. CONSTITUTION: An operation method of a base station for interference control in a broad band wireless communication system is as follows. The synchronization signal and broadcast system information are transmitted to the terminal(301). The information signal of neighboring base centers is analyzed. The information about for each frequency band mean power is transmitted from the each neighboring base station.
Abstract:
A cognitive wireless communication device for controlling sensing operation and a method thereof are provided to enable a cognitive wireless terminal to efficiently perform the sensing operation by adaptively controlling a sensing period or the number of sensing nodes according to a change pattern of a channel occupation situation. An information receiver(611) receives channel situation information related to a channel occupation situation of a primary system from at least one sensing node included in a secondary system. A sensing controller(612) controls a sensing period of the sensing node according to a change pattern of the channel occupation situation based on the channel situation information. A control information transmitter(613) transmits control information related to the controlled sensing period to at least one member node included in the secondary system.
Abstract:
An apparatus and a method for transmitting a pilot in a wireless communication system are provided to increase spectral efficiency by reducing overhead with regard to the pilot. A precode and a postcode for forming a coordinated beam are generated by using channel information of streams for transmitting a signal to receiving terminals located in a service area(503). An effective channel of remaining streams except for at least one stream to which a pilot is allocated by using the precode is predicted(505,507). The precodes of the remaining streams are updated to set a reference point of the predicted effective channels(509). A beam with regard to the streams is formed by using the updated precodes(511).
Abstract:
A system for utilizing frequency and time resources and a method therefor are provided to increase the frequency use efficiency by utilizing the guard bands which have been assigned to reduce signal interference between frequency bands. The whole frequency band is divided into the first sub frequency band(201), the second sub frequency bands(203, 205) and the third sub frequency band(207) at least. The first sub frequency band is used for transmitting and receiving of a downlink signal. The second sub frequency band is classified into a TDD DL band and a TDD uplink band based on the TDD method, and is used for transmitting and receiving the UL signal and DL signal. The third sub frequency band is used for transmitting and receiving the UL signal. A guard band 1(209) exists to prevent the interference between the first and second sub frequency bands, and a guard band 2(211) exists to prevent the interference between the second and the third sub frequency bands.
Abstract:
An apparatus for transmitting and receiving a message for being converted to a different system in a band wireless access system and a method thereof for efficiently using the control channel resources of a base station are provided to reduce the message overhead by transmitting information of the base station. Information about a base station of the different systems and NBR-ADV(NeighBoR-Advertisement) message generation mode is periodically exchanged to the base station(301). The information of neighboring base station of the target system is directly transmitted from the base station of the target system. The base station inspects whether it is the NBR-ADV message transfer timing in the frame structure of the system(303). The generated NBR-ADV message is broadcasted and transmitted(305).
Abstract:
A mobile antenna controlling method for efficiently performing communications and a mobile antenna control system using the same are provided to determine the number of antennas in consideration of the intensity information of the received signal. A receipt signal strength measuring part(110) measures the intensity of the signal which a mobile body receives. A speed detecting part(120) detects the transition speed of the mobile body. An environmental information generating part(130) generates environment information including the moving speed information of the intensity information of the received signal. The environmental information includes QoS(Quality of Service) information. The environment information generator receives the intensity information of the received signal from the received signal strength measurement part.
Abstract:
A method for adaptively selecting a P2P communication mode and an apparatus therefor are provided to enable a base station to select one of the P2P communication mode and a mobile communication mode, adaptively in consideration of the wireless environment of two terminals when the frequency bands used in the mobile communication and P2P communication are the same. A terminal(102) transmits a connection request message to a base station(100) in order to perform communication with the other terminal(104)(210). The base station broadcasts a P2P setup preparation instructing message to terminals(104, 106, 112) within a service coverage to determine whether the P2P communication connection is possible or not, before connecting to a mobile communication mode. The terminal broadcasts a PNR_req message to the other terminals(214). The base station receives a response message(PNR rsp) to the PNR_req message from a corresponding terminal(216). The base station receives the response message from terminals receiving the PNR req message(218), determines whether to use the P2P communication between the terminal and the other terminals based on information included in the PNR rsp message(220), and then selects a corresponding communication mode(222).
Abstract:
A method for allocating resources for a multi duplex mode in a communication system is provided to improve transmission efficiency and performance by assigning resources to a user in the multi duplex mode suitable for the channel environment and transmission data of a corresponding terminal. A method for allocating resources for a multi duplex mode comprises the following steps. A base station determines a multi duplex mode according to the situation of a corresponding terminal(400). The terminal's situation includes a channel environment, class, movement speed, SNR(Signal Noise Ratio), use charges of each resource and the kind of transmission data. The base station checks whether the terminal receives one or all of a paired band and a unpaired band or not(405), selects a method for transmitting DL(Down Link) resources including the determined multi duplex mode of the terminal(410), and then transmits the DL(Down Link) resources to the terminal through the selected transmitting/receiving method(415).