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    METHOD AND APPARATUS FOR COMMON PACKET CHANNEL ACCESS IN MOBILE SATELLITE COMMUNICATION SYSTEM
    3.
    发明公开
    METHOD AND APPARATUS FOR COMMON PACKET CHANNEL ACCESS IN MOBILE SATELLITE COMMUNICATION SYSTEM 有权
    方法和设备在移动卫星通信系统公用分组信道接入

    公开(公告)号：EP1436914A4

    公开(公告)日：2009-08-19

    申请号：EP02788886

    申请日：2002-10-21

    申请人： KOREA ELECTRONICS TELECOMM

    发明人： LIM KWANG-JAE ,  KIM SOO-YOUNG

    IPC分类号： H04B7/19 ,  H04B7/185 ,  H04B7/216

    CPC分类号： H04B7/18539 ,  H04B7/216

    摘要： Provided is a method and apparatus for common packet channel access to transmit data packet from a mobile terminal to a satellite access network in a mobile satellite communication system. The method and apparatus of this invention reduces transmission delay time, enhances the probability of successful access, and controls the currently used common packet channel by using a common control channel broadcast by the satellite access network. The method includes the steps of: receiving an access preamble including an access signature code and a collision-detection preamble including a collision-detection signature code, which are transmitted together from a plurality of mobile terminals, and transmitting an acknowledgement to the access preamble and collision-detection preamble to mobile terminals through a preamble acknowledgement channel.

    CLOSED-LOOP POWER CONTROL APPARATUS FOR MOBILE SATELLITE COMMUNICATION SYSTEM AND METHOD THEREOF
    5.
    发明公开
    CLOSED-LOOP POWER CONTROL APPARATUS FOR MOBILE SATELLITE COMMUNICATION SYSTEM AND METHOD THEREOF 有权
    闭环FOR A移动卫星通信系统及其方法电源控制设备

    公开(公告)号：EP1436918A4

    公开(公告)日：2006-09-20

    申请号：EP02788887

    申请日：2002-10-21

    申请人： KOREA ELECTRONICS TELECOMM

    发明人： CHOI KWON-HUE ,  LIM KWANG-JAE ,  KIM SOO-YOUNG

    IPC分类号： H04B7/26 ,  H04B7/185

    CPC分类号： H04B7/18543

    摘要： Apparatus and method for closed−loop power control in mobile satellite communication system, which can compensate round trip delay. The apparatus for closed−loop power control includes the means of; a)converting power control order from base earth station into power control step; b)measuring channel change rate from power of pilot channel; c)making tab coefficient using said channel change rate; d) compensating channel change due to loop delay using power control step; and e)renovating received signal power using said power control step.