FIELD: radio engineering, communication.
SUBSTANCE: terminal (UE) receives on the primary cell the size of the random-access response (RAR) window, indicating the duration of the RAR window through the system information. The UE receives the maximum number of preamble transmissions for random access of the secondary cell through the control information. The UE transmits a random-access preamble for random access of the secondary cell based on the maximum number of preamble transmissions and receives the RAR based on the window size.
EFFECT: providing random access performance for a terminal configured with a plurality of serving cells.
16 cl, 11 dwg
