Abstract:
Provided is a method for operating a portable terminal of a receiving side in a mobile communication system. The method includes the steps of: receiving a first packet from a portable terminal of a transmitting side; determining a fingerprint overlapping with the fingerprint corresponding to at least one chuck of the first packet in a fingerprint cache; determining a fingerprint set which has the most overlapping fingerprints in a fingerprint set cache; determining at least one fingerprint to be transmitted in the determined fingerprint set; transmitting at least one determined fingerprint to the portable terminal of the transmitting side; and receiving a second packet from the portable terminal of the transmitting side.
Abstract:
The present invention relates to a method for scheduling a node in a device to device (D2D) system. According to an embodiment of the present invention, the method for scheduling the node in the D2D system comprises the steps of acquiring a first transmission rate of a first link in consideration of interference if a second link is established; acquiring a second transmission rate of the first link if the second link is not established; acquiring a third transmission rate of the second link if the second link is established; and determining whether the second link is established in consideration of the first transmission rate, the second transmission rate, and the third transmission rate. According to an embodiment of the present invention, the method can provide efficiently scheduling.
Abstract:
PURPOSE: A method and apparatus for valancing loads and for allocating power based on the load prediction of neighbor cells are provided to minimize load terminals by determining a power and handover terminal group. CONSTITUTION: A reception unit(300) receives information for predicting each load of neighbor base stations from the neighbor base stations. A first determination unit(306) determines a power and handover terminal group based on information for predicting each load of the neighbor base station. A control unit(302) determines the power and handover terminal group for minimizing load terminals using information for predicting the load of the neighbor base station. The load terminal includes a minimum demand transmission rate which is bigger than an average reception rate. [Reference numerals] (300) Reception unit; (302) Control unit; (304) Transmission unit; (306) First determination unit; (308) Second determination unit
Abstract:
본 발명에 따른 동적 자원 할당 방법에서는 다수 단말이 부채널 별 동적자원할당을 지원하는지를 판단하고, 해당 단말이 부채널 별 동적 자원할당을 지원하면 부채널 별 자원할당을 수행하고, 부채널 별 동적 자원할당을 지원하지 않으면 버스트 별 자원할당을 수행한다. 본 발명의 OFDMA 기반의 무선통신시스템에서의 동적 자원 할당 방법에서는 단말의 성능 또는 단말의 요청에 따라 상이하게 정의된 DL-MAP IE을 이용하여 버스트 별 혹은 채널 별 자원 할당을 함으로써 효율적인 자원 관리가 가능하다. 직교주파수분할다중접속(OFDMA), 자원 할당, 물리 계층 동기화, 적응변조
Abstract:
An apparatus and a method for selecting a relay mode in a broadband wireless communication system using multi-hop relay are provided to improve a production yield and an outage performance of a system by using a proper relay mode according to a terminal distribution or a channel state. A base station requests channel state information with relay stations from a terminal(501), and checks whether a signal is received from the terminal(503). The base station checks channel state information between the relay stations and the terminal included in a reception signal(505). The base station estimates an interference strength and a signal strength by using the channel state information(507). The base station estimates CINRs(Carrier to Interference and Noise Ratios) of a simple relay mode and a cooperative relay mode(509), and determines a relay mode to provide a relay service by using the CINRs(511). The base station transmits resource allocation information including the relay mode to the relay stations and the terminal(513), and transmits data to the relay stations or the terminal according to the resource allocation information(515).
Abstract:
A resource allocation method using a hybrid duplexing technique is provided to be capable of allocating resources by mixing TDD(Time Division Duplexing) and FDD(Frequency Division Duplexing) techniques in consideration of communication environments, thus various QoSs(Quality of Services) can be ensured while resources are effectively managed. System resources are time-divided into a TDD section and an FDD section. The TDD section is time-divided into a TDD downlink section and a TDD uplink section. The FDD section is frequency-divided into an FDD uplink band and an FDD downlink band. The FDD downlink band and the FDD uplink band are frequency-divided into downlink narrowband channels(610d-1~610d-N) and FDD uplink narrowband channels(610u-1~610u-N).
Abstract:
An apparatus and a method for reducing a map channel overhead in a broadband wireless communication system are provided to simplify a source request procedure by performing a direct random access through data and receiving a feedback about success with a bitmap. An apparatus for reducing a map channel overhead in a broadband wireless communication system includes a map channel(101), down/up data bursts, and an uplink control channel(107). The map channel(101) locates source allocation of downlink and uplink. The down/up data bursts consist of fixed assignment regions(103,109) and dynamic assignment regions(105,111). The dynamic assignment regions(105,111) are allocated to users having a fine channel condition. The fixed assignment regions(103,109) are allocated to the users having a bad channel condition or using a small size service such as VoIP(Voice over Internet Protocol). The uplink control channel(107) transmits information of a random access for ranging and source allocation, a channel information feedback, and a hybrid ARQ.
Abstract:
A clustering method of a wireless sensor network for minimizing energy consumption is provided to be capable of minimizing the number of CHs(Cluster Heads) and GWs(Gateways) which are nodes having big energy consumption, in the wireless sensor network, thus energy efficiency of the network is increased. With regards to each of ONs(Ordinary Nodes) existing within a transmissible range of CHs, the number of INs(Initial Nodes) existing within a transmissible range of the ONs is perceived. An ON having the maximum number of INs is set to a GW among the ONs existing within the transmissible range of the CHs. If the ON having the maximum number of the INs is in plural, an ON having the lowest ID is set to the GW among the ONs having the maximum number of the INs.
Abstract:
본 발명은 다중 안테나를 사용하는 시변 시분할 시스템에서 전송 채널을 공간상의 부 채널들로 분리시키는 방법에 의해 다중 안테나를 통해 동시에 전송되는 신호들을 각각의 부 채널에 의한 신호로 분리하기 위한 신호 전송 장치 및 방법에 관한 것으로, 이전의 타임 슬롯에서 계산된 인자들 중의 하나를 입력받아 현재 타임 슬롯에서의 채널 분리를 위한 인자들을 계산함으로써 채널 분리를 위한 인자들의 계산을 위한 연산량을 감소시킨다. 다중 안테나, MIMO(Multiple Input Multiple Output), SVD(Singular Value Decomposition), QR Decomposition
Abstract:
본 발명은 광대역 무선 통신에서의 동시적 다중 복사 기법과 적응 순방향 오류 제어 기법을 사용한 무선 링크 계층의 오류 제어 방법에 관한 것으로, 제1 노드와 제2 노드간의 통신을 위하여 광대역 무선 채널을 사용하고, 자동 반복 요청 기법을 통하여 링크 계층의 오류 제어를 하는 광대역 무선 통신에서의 링크 계층의 오류 제어 방법에 있어서, (a) 상기 제2 노드에서 상기 제1 노드로 셀이 전송되는 방향인 역방향 채널의 상태를 통하여 상기 제1 노드에서 상기 제2 노드로 셀이 전송되는 방향인 순방향 채널의 오류율을 추정하여, 상기 추정된 오류율에 따라 가변적인 부호화율을 가지는 순방향 에러 정정 코드를 포함하는 무선 링크 계층의 프로토콜 데이터 유닛의 셀을 상기 순방향 채널을 통하여 전송하는 단계; (b) 상기 (a) 단계에서 전송된 셀에 오류가 있음을 표시하는 피드백 정보를 상기 역방향 채널을 통하여 수신하면, 상기 (a) 단계에서 전송한 셀의 복사본을 재전송하는 단계를 포함함을 특징으로 한다. 본 발명에서는 채널 상태가 열악할수록 더욱 많은 오류 제어 비트를 사용하여 순방향 오류 정정의 가능성을 높임에 따라 재전송 횟수를 줄이고, 채널 상태가 양호할수록 적은 오류 제어 비트를 사용하여 자원의 낭비를 최소화하는 방식에 의하여 최적의 성능을 내면서도, 최소의 지연 시간을 보장하는 효과가 있다.