METHOD AND APPARATUS FOR PERFORMING RANDOM ACCESS BASED ON DELAY DETERMINED BY NETWORK

摘要

A method for performing random access is disclosed. The method performs the operation based on a lower boundary and an upper boundary of a back-off time. According to the method, the transmission of a random access preamble following the initial transmission is determined by control information included in a random access response. The control information explicitly or non-explicitly indicates the lower boundary and the upper boundary of the back-off time. The exact value of the back-off time can be selected by the uniform distribution of the lower boundary and the upper boundary. [Reference numerals] (AA) YES;(BB) NO;(S710) Receiving SIB 2 through broadcasting;(S720) Selecting random number;(S730) Selected random number ac-BarringFactor;(S740,S770) Random access preamble;(S750) Random access response;(S760) Selecting back-off time and delaying next preamble