Methods for power control and link adapation in LTE-based mobile communication system

摘要

Provided is a power control and link adaptation method for compensating for a long round trip delay time and slow channel fading in a long term evolution (LTE)-based mobile communication system having a long round trip delay time, similar to a satellite mobile system, the method that may compensate for the long round trip delay time of the satellite mobile system in which a distance between a base station and a terminal is relatively long, when compared to a terrestrial LTE system, support a modulation and coding scheme (MCS) level requested by a terminal, by predicting a channel after the round trip delay time elapses, maintain compatibility within an existing LTE frame, by generating a transmit power control (TPC) instruction for an uplink closed-loop power control, on a frame by frame basis, and compensate for slow channel fading of the satellite mobile system.

主权项

1. A power control method for uplink data channel transmission in a satellite mobile communication system, the method comprising:
(a) determining a channel estimation value using a power spectral density (PSD) value of a frame unit, by a base station; and (b) generating a transmit power control (TPC) instruction based on the channel estimation value and a round trip delay time, and transmitting the generated TPC instruction to a terminal, by the base station, wherein, a transmit power control value at the terminal is determined based on the TPC instruction transmitted to the terminal and a delay compensation indicator.