US 11,856,601 B2
Terminal device, base station device, wireless communication system, and wireless communication method for allocating random access resources in an unlicensed band
Tsuyoshi Shimomura, Yokohama (JP); and Yoshinori Tanaka, Yokohama (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Dec. 21, 2020, as Appl. No. 17/129,008.
Application 17/129,008 is a continuation of application No. 15/968,322, filed on May 1, 2018, granted, now 10,966,244.
Application 15/968,322 is a continuation of application No. PCT/JP2015/081908, filed on Nov. 12, 2015.
Prior Publication US 2021/0112594 A1, Apr. 15, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/08 (2009.01); H04W 16/14 (2009.01); H04W 72/04 (2023.01); H04W 72/0446 (2023.01)
CPC H04W 74/0808 (2013.01) [H04W 74/08 (2013.01); H04W 74/0833 (2013.01); H04W 16/14 (2013.01); H04W 72/04 (2013.01); H04W 72/0446 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A terminal device comprising:
a receiver configured to receive a resource specifying signal that includes resource information and offset information, the resource specifying signal being periodically transmitted, the resource information being information on a plurality of first random access resources that are arranged at a first identical time and that have different frequencies in an unlicensed band to transmit a message for random access, the resource information including frequency information indicating a frequency relating to any of the plurality of first random access resources, the offset information indicating offset from a reference timing to a timing that the message can be transmitted;
a controller configured to select a preamble from a plurality of preamble candidates previously acquired; and
a transmitter configured to transmit the selected preamble by using a first random access resource based on the resource information.