Abstract:
Disclosed is a method for controlling a base station which provides a service for a terminal having a low priority and a terminal having a high priority. When the terminal having a low priority and the terminal having a high priority perform initial ranging, a base station determines whether call congestion occurs. If the base station determines that call congestion occurs, the base station appoints the size of an initial ranging backoff window which is included in an information element of Secondary- Superframe Header SubPacket3 (S-SFH SP3) as a first size, and the size of an initial ranging backoff window for the second terminal as a second size in a system configuration message. The method allows to improve the possibility of success of the terminal having a high priority in initial ranging. [Reference numerals] (100) Base station;(AA) Terminal having a low priority uses the size of an initial ranging backoff window included in S-SFH SP3;(BB) Terminal having a high priority uses the size of an initial ranging backoff window included in AAI -SCD;(S200) Initial ranging;(S210) Determine whether initial call congestion occurs;(S220) Increase the size of an initial ranging backoff window inside S-SFH SP3 IE;(S230) Secondary Superframe Header (S-SFH SP3);(S240) Write the size of an initial ranging backoff window inside AAI-SCD;(S250) System configuration information message (AAI-SCD)
Abstract:
PURPOSE: A terminal and a communication method thereof are provided to offer a wireless communication service even if there is damage to a base station. CONSTITUTION: A processor(510) includes a terminal mode unit and a relay mode unit which are connected through an internal interface. The processor receives a first message from a base station. The first message is a command for being operated as a relay mode which is supported by the relay mode unit. The processor sets the base station and a relay link. The terminal mode unit is operated as a low rank terminal of the relay mode unit through the internal interface. [Reference numerals] (510) Processor; (520) Memory; (530) RF module
Abstract:
PURPOSE: A repeater communication method, a terminal, and a communication method thereof are provided to offer a wireless communication service when a base station gets damaged. CONSTITUTION: A process(132) is connected to an RF(Radio Frequency) module. When scanning section information is requested from the base station, the process transmits a message including the scanning section information to the lower terminal. The process receives wireless synchronization from an upper base station according to the scanning section information. The process requests the scanning section information to the upper base station. [Reference numerals] (132) Processor; (134) Memory; (136) Module
Abstract:
본 발명은 무선 휴대 인터넷 시스템에 있어서, 변조 및 채널 부호화 방법이 동일한 서비스의 상이한 가입자를 위한 정보를 하나의 무선자원을 할당하여 전송한다. 또한 동시에 할당된 무선자원에 대한 가입자의 식별자 정보를 공통제어 정보를 통하여 전송한다. 따라서, 하나의 무선자원 블록에 복수의 가입자를 위한 정보가 공존하여 전송될 수 있으며, 하향링크 정보를 수신한 가입자 단말기는 공통제어 정보로 전송된 가입자의 식별자 정보를 통하여 해당 단말기를 위한 정보가 어느 무선자원 블록에 할당되었는가를 알 수 있으므로 수신된 프레임에서 가입자 자신을 위한 정보가 할당된 특정한 무선자원 블록만을 억세스하여 정보를 획득할 수 있다. 무선 휴대 인터넷, 무선 자원, 공통 제어 정보, 변조, 채널 부호화, 커넥션 식별자
Abstract:
PURPOSE: A transceiving device of a closed loop space time block code system having multiple transceiving antennas and a method thereof, and a transmit power assigning method in the system are provided to determine transmit antenna information on a channel having the best transmission state by comparing parameters, and to feed back the determined information to a transmission device, thereby magnifying a receiving SNR(Signal to Noise Ratio) while guaranteeing an improved BER(Bit Error Rate). CONSTITUTION: A transmitter(100) comprises as follows. An information source(110) supplies symbols to a receiver(200). A space time block code unit(120) maps the symbols with space time block codes, generates coded symbols, and outputs the coded symbols to paths as many as transmit antennas(140). A weight supplier(130) determines a weight according to information fed back through a feedback path from the receiver(200), supplies weights corresponding to each signal outputted from the space time block code unit(120), and assigns a transmit power.
Abstract:
PURPOSE: A terminal and a communication method thereof are provided to reduce interference between multi-functional terminals attempting to operate as a base station. CONSTITUTION: A multi-functional terminal capable of operating in a base station mode selects a first back-off delay time when entering a station mode. The multi-functional terminal transmits a preamble when the first back-off delay time finishes, unless the multi-functional terminal receives the preamble from another multi-functional terminal or a base station before the first back-off delay time finishes (S340). The multi-functional terminal selects a second back-off delay time (S350). The multi-functional terminal operates as the base station mode when the second back-off delay time finishes, unless the multi-functional terminal receives the preamble from another multi-functional terminal or a base station before the second back-off delay time finishes (S380). [Reference numerals] (AA,CC) Yes; (BB,DD) No; (S310) Select a first back-off delay time when entering a station mode and start a first back-off time; (S320) Whether or not a preamble is received from a different multi-functional terminal or the station?; (S330) Operate by a lower terminal; (S340) Transmit the preamble when the first back-off delay time finishes; (S350) Select the first back-off delay time and start a second back-off time; (S360) Whether of nor the preamble is received from the different multi-functional terminal or the station?; (S370) Operate by a lower terminal; (S380) Operate by the station mode when the second back-off time finishes
Abstract:
PURPOSE: A terminal and a communication method thereof are provided to offer a wireless communication service even if a base station is damaged. CONSTITUTION: A mobile repeater or relay mode multi-function terminal(130') is selected as a terminal which executes a repeater role. The mobile repeater or relay mode multi-function terminal receives information for a scanning section assigned by an upper base station from the upper base station. The mobile repeater or relay mode multi-function terminal transmits information for the scanning section to the lower terminal receiving a service. The mobile repeater or relay mode multi-function terminal includes a processor(132), a memory(134), and an RF(Radio Frequency) module(136). The memory stores various information related to the operation of the processor. The RF module receives or transmits a wireless signal. [Reference numerals] (132) Processor; (134) Memory; (136) RF module
Abstract:
본 발명은 라그랑지 보간법을 이용한 파일롯 심볼 기반의 채널 추정 방법 및 그 방법에 따라 채널을 추정하는 수신 장치에 관한 것이다. 이 파일롯 심볼 기반의 채널 추정 방법은 먼저 수신 신호에 포함된 각 시간 슬롯을 두 개의 반 슬롯으로 나누고, 두 개의 반 슬롯에 포함된 파일롯 심볼을 복원한다. 다음, 복원된 각 파일롯 심볼을 사용하여 해당하는 반 슬롯에 대한 채널 추정 평균값을 구한다. 다음, 연속되는 특정 개수의 반 슬롯에 해당되는 각 채널 추정 평균값에 대해 다항식 곡선(Curve Line)을 사용하여 보간하는 라그랑지(LAGRANGE) 다항식 보간을 적용하여 데이터 심볼을 추정한다. 본 발명에 따르면, 페이딩 채널의 변동 상태를 적절하게 추적함에 따라 채널 추정 오차를 크게 줄일 수 있으므로, 고속의 이동통신 환경에서 급변하는 채널 상태를 효과적으로 추정하고 보상할 수 있다. 파일롯 심볼, 채널 추정, 라그랑지 다항식 보간, LAGRANGE, 보간법, 수신 장치, RAKE, 레이크