Abstract:
PURPOSE: A wireless location measurement server using clock offset correction and a wireless location measurement method using the same are provided to minimize errors of a location estimate result by clock offset by measuring a relative clock frequency rate between beacons and compensating each beacon clock frequency. CONSTITUTION: Compensation pulse information including a clock count number of a first compensation pulse and a second compensation pulse is received from multiple beacons (200) which receive the first compensation pulse and the second compensation pulse from a step node. A relative clock frequency rate for clock offset compensation between the multiple beacons is calculated according to the beacon using a compensation pulse. The multiple beacons receive a location pulse from a tag of a location measurement target and receive location pulse information including the clock count number of the location pulse. A reception time point of the second compensation pulse in which the multiple beacons receive is synchronized with a same time point. Clock count information is calculated according to the beacon using the relative clock frequency rate corresponding to the synchronized time point. [Reference numerals] (1) Compensation pulse; (100) Compensation node; (3) Compensation pulse information packet; (300) Tag; (4) Location pulse; (400) Device (server); (5) Location pulse information packet
Abstract:
PURPOSE: A clock offset compensation method and an apparatus thereof are provided to minimize an error problem of a location estimation result due to clock offset by compensating a clock frequency of each beacon. CONSTITUTION: A compensation pulse information reception unit(410) receives compensation pulse information from beacons which receive a first compensation pulse and a second compensation pulse from a compensation node. The compensation pulse information includes a clock count number of the first compensation pulse and the second compensation pulse. A location pulse information reception unit(420) receives location pulse information from a plurality of beacons receiving a location pulse from a tag corresponding to a positioning target. A clock offset compensation unit(430) calculates a relative clock frequency ratio by beacon for clock offset compensation between beacons using the compensation pulse information. A clock count compensation unit(440) calculates compensated clock count information between a beacon and a tag by each beacon using the each clock count number and the each relative clock frequency ratio about the first compensation pulse, the second compensation pulse and the location pulse. [Reference numerals] (410) Compensation pulse information reception unit; (420) Location pulse information reception unit; (430) Clock offset compensation unit; (440) Clock count compensation unit
Abstract:
PURPOSE: A communication service providing device using a TV(TeleVision) idle band and a method thereof are provided to enable an idle band wireless station to use a TV idle band for providing a service through a mobile communication network in a mobile communication base station. CONSTITUTION: A wireless station information acquisition unit(120) requests the information of an idle wireless station in order to enable a user terminal to receive a communication service. The wireless station information acquisition unit acquires the information of an available idle wireless station based on a using state of an idle TV band and the current location information of a user terminal. An off-load unit(130) transmits the information of the available idle wireless station to the user terminal. The off-load unit transmits the information of the user terminal to the available idle wireless station. [Reference numerals] (110) Location information acquisition unit; (120) Radio station information acquisition unit; (130) Off-load unit
Abstract:
PURPOSE: A recursive type half band filter and a filtering method using the same are provided to replace multilevel half band filter with one half band filter. CONSTITUTION: A recursive type half band filter (100) comprises a first storing part (110), a second storing part (120), a calculating part (130), and a controlling part (140). The first storing part controls first input data among a plurality of input data composed of first input data and second input data, which are sequentially repeated at least once, to be impeded prior to be stored before second input data is inputted. The second storing part stores second input data. The calculating part multiplies the second input data with a predetermined filter coefficient before adding to the first input data, which is stored at the first storing part, for producing output data. Whether the output data is predetermined final output data allows the controlling part to determine the output data as final output data or as new input data. [Reference numerals] (110) First storing part; (120) Second storing part; (130) Calculating part; (141) Input controlling part; (142) Output controlling part; (143) Calculation stage control part; (144) Address control part
Abstract:
The present invention relates to a wireless communication apparatus operated in a dual band triple mode supporting a machine type communication (MTC) service operable in a TV white space area and a cellular frequency band, and an operation method thereof. To this end, the TV white space area and the cellular frequency band representing a dual band are supposed to be an operation frequency band considered in the present invention, and a PAN coordinator and an LTE-advanced base station TV band device (TVBD) essential for a triple mode operation are considered as elements. In addition, an MTC server concept is introduced for providing an individual MTC wireless device user with a smooth service and management. For accurate information provision for an MTC server, interoperability consideration between wireless devices, and an optimal service operation, the present invention has an interactive structure for an individual database (Hereinafter, DB) including a detailed service process structure and information on a service environment considered for each individual triple mode operation process.
Abstract:
TV 유휴대역을 이용한 통신 서비스 제공장치 및 방법이 개시된다. 이동통신망을 통해 사용자 단말로 통신 서비스를 제공하며, 사용자 단말이 TV 유휴대역을 통해 통신 서비스를 제공받도록 하는 이동통신 기지국에 구현된 통신 서비스 제공장치에 있어서, 위치 정보 획득부는 사용자 단말로 위치 정보 요청 메시지를 전송하여 사용자 단말의 현재 위치 정보를 획득한다. 무선국 정보 획득부는 복수의 유휴대역 무선국에 의한 TV 유휴대역의 사용 현황을 관리하는 유휴대역 서버로 현재 위치 정보를 전송하여 사용자 단말이 통신 서비스를 제공받을 수 있는 유휴대역 무선국의 정보를 요청하고, 유휴대역 서버로부터 복수의 유휴대역 무선국 중에서 사용자 단말의 현재 위치 정보 및 TV 유휴대역의 사용 현황을 기초로 결정된 사용 가능한 유휴대역 무선국의 정보를 획득한다. 오프로드부는 사용 가능한 유휴대역 무선국의 정보를 사용자 단말로 전송하고, 사용 가능한 유휴대역 무선국으로 사용자 단말의 정보를 전송한다. 본 발명에 따르면, 이동통신 기지국에 의해 제공되는 통신 서비스를 DTV 수신기를 비롯한 보호되어야 할 방송 보조 서비스, 면허 무선 마이크 및 CATV 헤드엔드에 간섭을 발생시키지 않는 범위에서 TV 유휴대역을 통해 제공함으로써, 광대역 이동통신 네트워크의 데이터를 다른 통신망으로 분산시켜 안정적인 통신 서비스를 제공할 수 있다.
Abstract:
TV 유휴 채널로 동작하는 스마트 유틸리티 네트워크에서의 무선 접속 제공 장치 및 방법이 개시된다. 간섭관리정보 수신부는 기지국을 통한 데이터 전송 서비스의 1차 사용자에 대한 전송 커버리지 영역 내에 위치하는 통신기기들 중에서 적어도 하나로부터 간섭관리를 위해 필요한 간섭관리정보를 수신한다. 간섭관리정보 분석부는 간섭관리정보를 기초로 통신기기들 중 1차 사용자와 공존할 수 있는 주파수 대역을 통해 통신하고자 하는 2차 사용자에 대한 간섭분석을 통해 산출된 간섭확률 값에 근거한 간섭 기준치, 간섭온도, 간섭온도 제한치 및 취득 가능한 통신용량을 포함하는 데이터를 산출한다. 주파수 대역 할당부는 산출된 데이터 및 2차 사용자가 요구하는 통신용량을 기초로 2차 사용자가 사용 가능한 주파수 대역을 할당한다. 본 발명에 따르면, 실시간 전력 소비 및 과금정보, 각종 통신환경 정보 전송으로 인해 발생 되는 무선 트래픽을 효율적으로 이용할 수 있다.