Abstract:
PURPOSE: A method for certification in a mobile communications net by using a smart card is provided to prevent that an unqualified user uses the service and to prevent network exposure of secret information of the user by using the smart card in the mobile communications circumstance. CONSTITUTION: A method for certification in a mobile communications net by using a smart card includes a few stages. In the first stage the certifying center of network generates a public key and a secret key and stores them in DB of the certifying center when execution begins. In the second stage(41) the mobile subscriber registers service with own ID in the certifying center. In the third stage(42,43,44) the mobile subscriber puts own smart card into the mobile terminal and judges yes or no of network excess. In the fourth stage(45) network certifies information sent through the mobile terminal and the smart card and inspects if the mobile subscriber and the smart card holder are reasonable or not when the mobile subscriber tries network excess by putting own smart card into the mobile terminal. In the fifth stage(46,47,48) the mobile subscriber gets mobile service according to the result of inspecting and ends the mobile communications service and removes the card from the mobile terminal and then the identity certification and inspecting service using the smart card end.
Abstract:
PURPOSE: A method for checking a non-communicable area by using a mobile station of a general subscriber is provided to make the mobile station detect a receiving intensity of a radio wave in a pause state, so as to widely perceive the non-communicable area. The method is also provided to add a simple protocol to the mobile station and a base station, to add a collection analyzing function to an operation and maintenance device, and to use the mobile station of the general subscriber, so as to improve a system efficiency to prevent a deterioration of a system capacity. CONSTITUTION: If a power of a mobile station is turned on, an operation of the mobile station starts(S301). The mobile station performs an initialization(S302). The mobile station selects a base station having a strongest signal intensity among pilot signals received as a predetermined frequency in a subscriber mobile communication system, and acquires the system to synchronize the system(S303). The mobile station decides whether a function for monitoring a non-communicable area is activated(S304). If so, the mobile station measures pilot intensities of the base station and an adjacent base station(S311). The mobile station confirms whether the initialization is performed by a non-communicable area approach(S312) and whether a non-communicable limit time exceeds(S313). The mobile station notifies the base station of signal intensities of the pilot signals before approaching to the non-communicable area and signal intensities of the pilot signals after approaching to a communicable area as messages(S314). The mobile station performs a transition to a non-communicable area monitoring idle state(S308).
Abstract:
본 발명은 이동통신시스템에서 PAPR(peak-to-average power ratio)을 감소시킴으로써 단말기의 전력 효율을 개선시킬 수 있는 데이터 메시지를 변조하기 위한 장치 및 방법을 제공하는데 그 목적이 있다. 본 발명의 적어도 하나의 채널을 이용하는 단말기에서 소스 데이터를 다수의 동위상 및 직교위상 데이터의 쌍을 갖는 채널 변조 신호로 변환하기 위한 방법에 있어서, 적어도 하나의 데이터부 및 제어부를 생성하기 위해 상기 소스 데이터를 코딩하는 제1단계와, 상기 채널에 할당되는 적어도 하나의 확산코드를 생성하는 제2단계와, 상기 확산코드를 이용함으로써 상기 제어부 및 상기 데이터부 확산하여 상기 채널변조신호를 생성하는 제3단계를 포함하며, 여기서 상기 각 확산코드는 상기 제어부 및 상기 데이터부의 데이터 전송률에 기초하여 선택되며, 상기 확산 코드들은 위상 도메인 상에서 두 개의 연속적인 동위상 및 직교위상 데이터의 쌍이 동일한 포인트에 위치되거나 또는 영점 대칭되는 두 개의 포인트에 상응하도록 선택된다.
Abstract:
PURPOSE: A structure of an ATM interface module of an IMT-2000 network base station controller is provided to accommodate many base stations efficiently and to achieve high-speed multimedia transmission through ATM interfacing with an exchange. CONSTITUTION: An ATM interface module consists of an S-T bus interface unit(201), a time switch interface unit(202), an AAL-1 processing unit(203), an HDLC interface unit(207), a control processor(208), an AAL-5 processing unit(211), a cell MUX/DEMUX unit(204), an ATM transmission unit(205) and an IPC bus interface unit(209). The S-T bus interface unit(201) connects a plurality of base stations through digital trunk lines and transmits 8 E1-class channels received from a backboard. The time switch interface unit(202) executes a time slot exchange function of various data according to the channels transmitted from the ST-BUS interface unit(201). The AAL-1 processing unit(203) converts voice and image associated traffic data into AAL-1 type ATM cells. The HDLC interface unit(207) converts voice and image associated traffic data into HDLC type data. The control processor(208) executes the control and maintenance of the STM interface module. The cell MUX/DEMUX unit(204) having a cell multiplexing and demultiplexing function converts a plurality of ATM inputs into a plurality of ATM outputs. The ATM transmission unit(205) receives a clock for the S-T bus and supplies it to the time switch interface unit(202). The IPC bus interface unit(209) executes interfacing so as to transmit and receive various data between the cell MUX/DEMUX unit(204) and the AAL-5 processing unit(211).