US 12,219,375 B2
Communication control method
Masato Fujishiro, Yokohama (JP); and Henry Chang, San Diego, CA (US)
Assigned to KYOCERA Corporation, Kyoto (JP)
Filed by KYOCERA Corporation, Kyoto (JP)
Filed on Feb. 7, 2022, as Appl. No. 17/666,068.
Application 17/666,068 is a continuation of application No. PCT/JP2020/028571, filed on Jul. 22, 2020.
Claims priority of provisional application 62/884,268, filed on Aug. 8, 2019.
Prior Publication US 2022/0159485 A1, May 19, 2022
Int. Cl. H04W 24/04 (2009.01); H04W 84/04 (2009.01)
CPC H04W 24/04 (2013.01) [H04W 84/047 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A communication control method used in a mobile communication system in which at least one communication path is formed between a user equipment and a donor apparatus by using a plurality of relay apparatuses, the communication control method comprising:
performing, by a first relay apparatus included in the plurality of relay apparatuses, dual connectivity communication with a master node and a secondary node;
receiving from the master node, by the first relay apparatus, a first failure notification on a failure of a backhaul link between an upper apparatus of the master node and the master node;
after receiving the first failure notification from the master node, receiving from the secondary node, by the first relay apparatus, a second failure notification on a failure of a backhaul link between an upper apparatus of the secondary node and the secondary node;
after receiving the first failure notification from the master node and receiving the second failure notification from the secondary node, starting a timer by the first relay apparatus; and
in response to expiration of the timer, transmitting by the first relay apparatus to a lower apparatus of the first relay apparatus, a third failure notification on a failure of a backhaul link of the first relay apparatus.