Communication control method

A relay node used in a cellular communication system, the relay node comprising:

• a processor circuitry configured to execute:
• processing of configuring EN-DC (Evolved universal terrestrial radio access-New radio) dual connectivity in which a first parent node of LTE (Long Term Evolution) is a master node and a second parent node of NR is a secondary node;
• processing of transmitting a first notification to a child node in response to a radio link failure being detected in a second backhaul link among first and second backhaul links, the first backhaul link being between the relay node and the first parent node and the second backhaul link being between the relay node and the second parent node, the first notification indicating detection of the radio link failure;
• and
• processing of transmitting a second notification to the child node, the second notification indicating recovery from the radio link failure, in response to recovery from the radio link failure occurs after transmitting the first notification.

A chipset for a relay node used in a cellular communication system, the chipset comprising:

• a processor circuitry configured to execute:
• processing of configuring EN-DC (Evolved universal terrestrial radio access-New radio) dual connectivity in which a first parent node of LTE (Long Term Evolution) is a master node and a second parent node of NR is a secondary node;
• processing of transmitting a first notification to a child node in response to a radio link failure being detected in a second backhaul link among first and second backhaul links, the first backhaul link being between the relay node and the first parent node and the second backhaul link being between the relay node and the second parent node, the first notification indicating detection of the radio link failure;
• and
• processing of transmitting a second notification to the child node, the second notification indicating recovery from the radio link failure, in response to recovery from the radio link failure occurs after transmitting the first notification.