METHOD AND APPARATUS FOR POWER CONTROL OF FIRST DATA TRANSMISSION IN RANDOM ACCESS PROCEDURE OF FDMA COMMUNICATION SYSTEM Russian patent published in 2013 - IPC H04W52/16 

FIELD: information technology.

SUBSTANCE: transmitted power is controlled for a first uplink data transmission on a physical uplink shared channel (PUSCH) during a random access channel (RACH) procedure. Power control adjustment for the first PUSCH transmission is performed relative to the power spectral density used for successful PRACH transmission as adjusted for bandwidth difference, etc. The uplink physical random access channel carries the RACH information which is transmitted by the user equipment (UE) during registration or base station outgoing calls. A PRACH consists of a number of preambles and a message portion. The preambles are a series of radio frequency power "steps" which increase in power according to the power step setting until the maximum number of preambles is reached or the base station acknowledges. Once the UE receives a positive indication, it transmits the message portion of the PRACH which consists of message data and control data with independent power gain control.

EFFECT: ensuring stability and reliability of the system.

60 cl, 10 dwg