Abstract:
위성 OFDMA 하향링크에서 PAR를 최소화하기 위한 제어 방법을 제안한다. 본 발명의 실시예에 따른 OFDMA기반 위성 무선 시스템의 하향링크에서 제어 방법은, 모든 사용자의 대규모 페이딩값들을 추정하는 단계; 대규모 페이딩값이 기준 페이딩값보다 큰 사용자들의 수를 카운트하는 단계; 상기 카운트한 사용자들의 수가 기준 사용자 수보다 작으면, 상기 카운트한 사용자들이 사용하는 부반송파의 수를 카운트하는 단계; 및 상기 카운트한 부반송파의 수가 기준 부반송파 수 보다 작으면, 전력제어 모드로 제어하는 단계를 포함한다. PAR, 위성 OFDMA, 전력제어, AMC, 적응적 변조 및 부호화
Abstract:
PURPOSE: An apparatus and a method for selecting a modulation and coding mode for MBS(Multicast and Broadcast Service) are provided to perform modulation and coding in consideration of the number of a subscriber mobile stations by MBS content. CONSTITUTION: A motion station number count unit(202) recognizes the number of mobile stations. A feedback information receiving unit(201) feedbacks channel information from the mobile station according to MBS content. A transmitting unit(204) transmits the number of recognized mobile stations and channel information. A receiving unit(205) receives a modulation and coding mode from the server. A power determining unit(206) determines power based on interference from the other base station and channel information of the mobile station. [Reference numerals] (201) Feedback information receiving unit; (202) Motion station number count unit; (203) Storing unit; (204) Transmitting unit; (205) Receiving unit; (206) Power determining unit; (AA) Base station; (BB) Receiving intention; (CC) Feedback information
Abstract:
The present invention relates to a method for providing a multicast and broadcast service (MBS) in a mobile communication environment, including: a step of establishing an MBS zone, which has one or more member base stations, to provide content; a step of configuring the MBS zone by classifying the one or more member base stations of the MBS zone into active members transmitting MBS traffic and an MBS control parameter at the same time and inactive members transmitting only an MBS control parameter based on a rule defined in advance; and a step of transmitting the MBS traffic to a terminal by connecting a data transmission passage with the active members. [Reference numerals] (200) MBS service controller; (210) MBS content server; (220) Service delivery network; (230) Base station; (240) User terminal 1; (241) User terminal 2; (242) User terminal 3
Abstract:
The present invention relates to a server for allocating Multicast/Broadcast Service (hereafter called MBS) parameters. The server comprises; a parameter allocation unit for generating parameters, which are related to at least one MBS content transmitted from a content server, in the form of a table; and a communication unit for transmitting the parameter table generated by the parameter allocation unit to an access network gateway, wherein the parameter allocation unit allocates the same Multicast connection Identifier (hereafter called MCID) to the same MBS content. [Reference numerals] (120) MBS server;(210) Parameter allocating unit;(220) Content synchronization determining unit;(230) Information update unit;(240) Communication unit
Abstract:
PURPOSE: By presuming the large-scale fading value of user and controlling the power control mode the control method for minimizing the PAR can minimize PAR. CONSTITUTION: A large-scale fading values of all users are presumed. The number of users in which the large-scale fading value bigger than the standards fading value is counted. The number of subcarrier which users counted use is counted. It is controlled to the power control mode. The large-scale amplitude value of user is presumed. The TX power is adjusted if the large-scale amplitude value is not similar of the reference amplitude value(320). The transmission signal becomes to the TX power adjusted(330).