US 12,284,686 B2
Random access method and apparatus and communication system
Yang Lu, Beijing (CN); Guorong Li, Beijing (CN); and Meiyi Jia, Beijing (CN)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Apr. 28, 2022, as Appl. No. 17/731,361.
Application 17/731,361 is a continuation of application No. PCT/CN2019/116423, filed on Nov. 7, 2019.
Prior Publication US 2022/0256620 A1, Aug. 11, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 56/00 (2009.01); H04W 72/02 (2009.01); H04W 72/044 (2023.01); H04W 72/23 (2023.01); H04W 74/08 (2009.01)
CPC H04W 74/0841 (2013.01) [H04W 56/001 (2013.01); H04W 72/02 (2013.01); H04W 72/044 (2013.01); H04W 72/23 (2023.01); H04W 74/0866 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A random access apparatus, applicable to a terminal equipment, the apparatus comprising first processor circuitry, wherein the first processor circuitry is configured to:
determine a random access type according to configuration information of a bandwidth part (BWP) for random access selected by the terminal equipment and downlink reference signal received power measured by the terminal equipment;
perform selection of random access resources; and
transmit an initial message of random access on the random access resources,
wherein the performing of the selection of the random access resources comprises:
performing two-step random access resource selection after determining that the random access type is two-step random access; and
performing four-step random access resource selection after determining that the random access type is four-step random access,
wherein the performing two-step random access resource selection comprises:
selecting two-step contention-free random access resources when a selection condition of the two-step contention-free random access resources is satisfied; and
selecting two-step contention-based random access resources when the selection condition of the two-step contention-free based random access resources in not satisfied.