US 12,010,733 B2
Terminal apparatus, base station apparatus, control method, and computer-readable storage medium for executing random access procedure
Takeo Ohseki, Fujimino (JP); Issei Kanno, Fujimino (JP); Yasuhiro Suegara, Fujimino (JP); and Masahito Umehara, Fujimino (JP)
Assigned to KDDI CORPORATION, Tokyo (JP)
Filed by KDDI CORPORATION, Tokyo (JP)
Filed on Aug. 9, 2021, as Appl. No. 17/397,030.
Application 17/397,030 is a continuation of application No. PCT/JP2019/025797, filed on Jun. 28, 2019.
Claims priority of provisional application 62/805,059, filed on Feb. 13, 2019.
Prior Publication US 2021/0392700 A1, Dec. 16, 2021
Int. Cl. H04W 74/0833 (2024.01); H04W 72/044 (2023.01); H04W 74/0836 (2024.01); H04W 76/10 (2018.01)
CPC H04W 74/0841 (2013.01) [H04W 72/044 (2013.01); H04W 74/0836 (2024.01); H04W 76/10 (2018.02)] 17 Claims
OG exemplary drawing
 
1. A terminal apparatus that executes a two-step random access procedure or a four-step random access procedure to establish a connection with a base station apparatus, comprising:
one or more processors; and
one or more memories that stores computer-readable instruction for causing, when executed by the one or more processors, the terminal apparatus to:
transmit a first message of the two-step random access procedure including a preamble and predetermined information for connection establishment; and
transmit, in a case where a number of unsuccessful attempts to receive the first message by the base station apparatus exceeds a predetermined number, a second message to be transmitted from the terminal apparatus to the base station apparatus in the four-step random access procedure,
wherein communication between the base station apparatus and the terminal apparatus is performed using at least one of a plurality of bandwidth parts included in a usable frequency band,
the predetermined number is set for each one of the plurality of bandwidth parts, and
in a case where the number exceeds the predetermined number set for one bandwidth part used to transmit the first message from among the plurality of bandwidth parts, the terminal apparatus transmits the second message.