Abstract:
PURPOSE: A terminal and a communication method thereof are provided to select an a multi-functional terminal which is optimized to operate as a repeater mode or a base station mode, by utilizing a base station identification (BSID) of a previous serving base station for multi-functional terminals. CONSTITUTION: A processor (132) of a multi-functional terminal is connected to a radio frequency (RF) module, and performs controls to operate in a repeater mode or a base station mode. When detecting a service of a serving base station is unavailable, the processor searches for an available base station which is adjacent to the multi-functional terminal. The processor transmits a ranging request message including a previous serving BSID of the said serving base station to an available adjacent base station. The adjacent base station selects the multi-functional terminal using the said BSID for recovering a temporary network via a terminal. [Reference numerals] (132) Processor; (134) Memory; (136) RF module
Abstract:
PURPOSE: A packet scheduling method in accordance with power is provided to determine a priority in consideration of power-related parameters, and to assign a remaining power to a terminal which can transmit more data groups with little power, thereby increasing a system throughput with the limited power. CONSTITUTION: A system manager of a base station decides whether to consider power parameters for packet scheduling(S301). If so, the system manager sets a beta value according to a reflecting degree of the power parameters(S302), and calculates an amount of necessary power and average power(S303), then determines a priority(S304). The base station assigns a power to each terminal according to the priority(S305), and carries out a scheduling process for data transceiving.
Abstract:
PURPOSE: A channel estimation method based on a pilot symbol by using a Lagrange interpolation method and a receiving device for estimating a channel according to the method are provided to properly track a state of a suddenly changing channel by using an interpolation method using a Lagrange interpolating polynomial, thereby estimating a more remarkably changing channel state. CONSTITUTION: Each time slot is divided into two semi-slots, while pilot symbols included in each of the two semi-slots are restored. A channel estimation average value for the semi-slots is obtained by using the restored pilot symbols. A data symbol is estimated by applying a Lagrange polynomial interpolation for interpolating each channel estimation average value corresponding to a specific number of continuous semi-slots with the use of a polynomial curve line.
Abstract:
Disclosed is an access method for a terminal having a high priority. A base station allocates a ranging code dedicated for the terminal having the high priority and tries to conduct initial ranging by using the allocated dedicated ranging code. The base station allocates resources in order for the terminal having the high priority to transmit a ranging request message. The terminal having the high priority transmits the ranging request message to the base station by using the allocated resource. [Reference numerals] (AA) Base station; (BB) Terminal; (S210) Recognize priority access operation situation; (S220) Allocate a CDMA code for a terminal having the high priority(= X
Abstract:
본 발명은 다중 송수신 안테나를 가진 폐루프 시공간 블록 부호화 시스템의 송수신 장치 및 그 방법과, 그 시스템에서의 송신 전력 할당 방법에 관한 것이다. 특히, 송신 장치는 시공간 블록 부호화에서 수신 장치로 송신될 신호를 시공간 블록 부호화하여 다중 송신 안테나를 통해 송신될 수 있는 신호들을 생성한다. 가중치 공급부는 시공간 블록 부호화부에서 출력되는 신호들 중 전송 채널 상태가 가장 양호한 채널에 해당되는 송신 안테나로 공급되는 신호에 최대 전력이 할당되도록 가중치를 적용하여 다중 송신 안테나로 출력한다. 다중 송신 안테나는 가중치 공급부에서 전력 할당된 신호를 받아서 수신 장치로 송신한다. 여기서 전송 채널 상태가 가장 양호한 채널에 해당되는 송신 안테나 정보는 수신 장치에 의해 추정된 전송 채널의 파라미터의 상호 비교에 의해 결정되며, 특정 궤환 경로를 통해 송신 장치로 궤환된다. 본 발명에 따르면, 다중 송수신 안테나를 가진 폐루프 시공간 블록 부호화 시스템 환경에서 수신 장치의 수신 신호 대 잡음 비가 최대화되고, 이로 인해 종래에 비해 향상된 비트 오율을 보장할 수 있다. MIMO, 다중 입력 다중 출력, 다중 송신 안테나, 다중 수신 안테나, 폐루프 시공간 블록 부호화 시스템, 전력 할당, 채널 추정 파라미터, 채널 상태
Abstract:
PURPOSE: A method and apparatus for allocating radio resources in a wireless mobile Internet system are provided to lower power consumption of mobile terminal and increase use efficiency of a battery thereof. CONSTITUTION: A base station recognizes radio channel characteristics of downlink(S10). The base station determines adaptive modulation and a channel coding level according to the recognized radio channel characteristics(S11). The base station allocates radio resource corresponding to the modulation and the coding level(S12). The base station generates subscriber information with respect to the allocated radio resource and maps it to a common control information block(S13). The base station transmits packet data in a frame format to downlink(S14).