US 12,133,268 B2
Terminal apparatus, base station apparatus, and radio communication method
Katsunari Uemura, Tokyo (JP)
Assigned to SOFTBANK CORP., Tokyo (JP)
Appl. No. 17/426,284
Filed by SOFTBANK CORP., Tokyo (JP)
PCT Filed Feb. 14, 2019, PCT No. PCT/JP2019/005458
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/157994, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-012915 (JP), filed on Jan. 29, 2019.
Prior Publication US 2021/0392701 A1, Dec. 16, 2021
Int. Cl. H04W 28/02 (2009.01); H04W 52/24 (2009.01); H04W 74/0833 (2024.01); H04W 80/02 (2009.01)
CPC H04W 74/0841 (2013.01) [H04W 28/0278 (2013.01); H04W 52/242 (2013.01); H04W 80/02 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A terminal apparatus executing radio communication with a base station apparatus, the terminal apparatus comprising:
a transmitter that transmits a first message, including a random access preamble, for initiating a random access procedure, to the base station apparatus;
a receiver that receives a second message, including a random access response to the first message, from the base station apparatus;
a processing unit that:
selects one random access preamble group from among a plurality of random access preamble groups on the basis of at least one condition of a first condition requiring that a size of first data is larger than a specified value, and a second condition requiring that a path loss value is smaller than a specified value;
selects a first random access preamble group, upon fulfilling the first condition and the second condition;
selects a second random access preamble group, upon not fulfilling the first condition or the second condition; and
sets information indicating that a size of second data is zero in the first message, upon fulfilling a third condition requiring that the size of the second data is zero,
wherein,
upon detecting the data transmitted via a specified channel is not a service data unit of a common control channel, the processing unit that selects one random access preamble group, from among the plurality of random access preamble groups, on the basis of at least one of the first condition and the second condition,
the plurality of random access preamble groups are classified into the first random access preamble group, the second random access preamble group, and a third random access preamble group,
the processing unit that:
judges the third condition preferentially over the first condition and the second condition;
selects the third random access preamble group, upon fulfilling the third condition;
selects the first random access preamble group, upon fulfilling the first condition and the second condition; and
selects the second random access preamble group, upon not fulfilling the first condition or the second condition.