US Patent No. 10,485,045

RANDOM ACCESS METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM SUPPORTING DUAL CONNECTIVITY


Patent No. 10,485,045
Issue Date November 19, 2019
Title Random Access Method And Apparatus For Use In Wireless Communication System Supporting Dual Connectivity
Inventorship Jaehyuk Jang, Suwon-si (KR)
Soenghun Kim, Suwon-si (KR)
Gert-Jan Van Lieshout, Apeldoorn (NL)
Youngbum Kim, Seoul (KR)
Assignee Samsung Electronics Co., Ltd., Suwon-si (KR)

Claim of US Patent No. 10,485,045

1. A method by a terminal, the method comprising:identifying that a first physical random access channel (PRACH) transmission of the terminal on a first cell of a first base station is overlapped with a second PRACH transmission of the terminal on a second cell of a second base station in a time domain and a sum of transmission power determined for the first PRACH transmission of the terminal and transmission power determined for the second PRACH transmission of the terminal exceeds a maximum transmission power configured for transmissions overlapped in the time domain for a dual connectivity;
performing the first PRACH transmission of the terminal on the first cell based on the transmission power determined for the first PRACH transmission;
adjusting the transmission power determined for the second PRACH transmission and performing the second PRACH transmission of the terminal on the second cell based on the adjusted transmission power;
in a case that no random access response for the first cell is received for a first predetermined time, performing an increase of a number of a PRACH transmission for the first cell and performing a PRACH retransmission on the first cell based on a transmission power which is determined based on the number of the PRACH transmission for the first cell; and
in a case that no random access response for the second cell is received for a second predetermined time, skipping an increase of a number of a PRACH transmission for the second cell and performing a PRACH retransmission on the second cell based on a transmission power which is determined based on the number of the PRACH transmission for the second cell.