US 12,477,428 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 Sep. 20, 2021, as Appl. No. 17/479,651.
Application 17/479,651 is a continuation of application No. PCT/JP2020/013788, filed on Mar. 26, 2020.
Claims priority of provisional application 62/825,157, filed on Mar. 28, 2019.
Prior Publication US 2022/0007259 A1, Jan. 6, 2022
Int. Cl. H04W 36/30 (2009.01); H04W 76/27 (2018.01)
CPC H04W 36/305 (2018.08) [H04W 76/27 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A communication control method for controlling dual connectivity communication in which a user equipment is configured to connect to a master node associated with a master cell group (MCG) and connect to a secondary node associated with a secondary cell group (SCG), the communication control method comprising:
transmitting, by the user equipment to the master node, capability information indicating that the user equipment supports recovery from MCG radio link failure (RLF) via a signaling radio bearer (SRB) established between the user equipment and the secondary node;
receiving configuration information configuring the user equipment to transmit a first message for MCG link recovery to the secondary node in response to the MCG RLF,
detecting, by the user equipment, the MCG RLF on a radio link between the master node and the user equipment;
based on the received configuration information, transmitting, by the user equipment, the first message to the secondary node via the SRB established between the user equipment and the secondary node, in response to detecting the MCG RLF;
starting a timer in response to transmission of the first message;
performing RRC connection re-establishment processing in response to expiration of the timer; and
transmitting, by the secondary node having received the first message, another message to the master node, the another message being used to recover the dual connectivity communication, wherein
the first message includes a measurement result obtained by measuring a radio state between the user equipment and the master node and information indicating a type of the failure, and
the type of failure includes problem of a random access.