POWER CONTROL AND LINK ADAPTATION METHODS IN LTE BASED MOBILE COMMUNICATIONS

摘要

The present invention relates to methods for power control and link adaptation techniques to compensate for a long round trip delay time and slow channel fading in an lte-based mobile communication system system having a long round trip delay time, such as a satellite mobile. The methods are capable of: compensating for a long round trip delay time in a satellite mobile system having a longer distance between a base station and a terminal compared to a terrestrial lte system; supporting a MCS level requested by a terminal by predicting a channel in a round trip delay time, maintaining compatibility within an existing lte frame by generating a TPC instruction per frame to control uplink closed loop power; and compensating for slow channel fading in a satellite mobile system having a longer distance between a base station and a terminal compared to a territorial lte system. [Reference numerals] (AA) Start;(BB) Measure the strength of a signal receiving a frame unit upward link;(CC) Determine TPC where a channel expectation value is reflected;(DD) Transmit TPC from a base station to a terminal;(EE) Determine a delay compensation power control value by using the received current TPC and the past TPC;(FF) Reflect the delay compensation power control value to a terminal transmitting power;(GG) Transmit data from the terminal to the base station;(HH) End