Operating method of node in wireless communication system, and device using method

1. An operation method of a node in a wireless communication system, the operation method comprising:

allocating resources to a child node using one of a plurality of resource allocation types; wherein the plurality of resource allocation types comprise i) a first resource allocation type and ii) a second resource allocation type,

wherein, in the first resource allocation type, a bitmap indicates Resource Block Groups (RBGs) that are allocated to the child node,

wherein, in the second resource allocation type, a resource allocation field informs of a starting resource block and a length in terms of contiguously allocated resource blocks that are allocated to the child node;

receiving a radio resource control (RRC) signal configuring a due time;

transmitting, to the child node, a link unstableness signal informing unstableness of a link, based on the link with a parent node being unstable;

monitoring whether a link restoration signal is received from the parent node within a connection recovery time; and

transmitting a handover trigger signal to the child node based on the link restoration signal being not received within the connection recovery time,

wherein the link is determined to be unstable based on a situation, in which reference signal received power (RSRP) or reference signal received quality (RSRQ) measured in the link is equal to or smaller than a threshold, being maintained for the due time, and

wherein information for a reason with a cause value to support the child node in taking subsequent actions is transmitted together with the link unstableness signal.

2. The operation method of claim 1 , wherein the reason represents at least one of the number of beam failures, a low RSRP/RSRQ, a low channel quality indicator (CQI), and low throughput.

3. The operation method of claim 1 , wherein the connection recovery time is previously determined or is set by the parent node.

4. The operation method of claim 1 , wherein the link restoration signal is transmitted to the child node based on the link restoration signal being received within the connection recovery time.

5. The operation method of claim 1 , wherein a downlink signal including at least one of a lowest block error rate (BLER) in a higher path of the node, the number of hops of the higher path, a data load of a path including the parent node, and the number of nodes supported by the parent node is further received from the parent node.

6. A node comprising:

a transceiver configured to transmit or receive a wireless signal; and

a processor operatively coupled with the transceiver,

wherein the processor is configured to:

allocate resources to a child node using one of a plurality of resource allocation types; wherein the plurality of resource allocation types comprise i) a first resource allocation type and ii) a second resource allocation type,

wherein, in the first resource allocation type, a bitmap indicates Resource Block Groups (RBGs) that are allocated to the child node,

wherein, in the second resource allocation type, a resource allocation field informs of a starting resource block and a length in terms of contiguously allocated resource blocks that are allocated to the child node,

receive a radio resource control (RRC) signal configuring a due time,

transmit, to the child node, a link unstableness signal informing unstableness of a link based on the link with a parent node being unstable,

monitor whether a link restoration signal is received from the parent node within a connection recovery time, and

transmit a handover trigger signal to the child node based on the link restoration signal being not received within the connection recovery time,

wherein the link is determined to be unstable based on a situation, in which reference signal received power (RSRP) or reference signal received quality (RSRQ) measured in the link is equal to or smaller than a threshold, being maintained for the due time, and

wherein information for a reason with a cause value to support the child node in taking subsequent actions is transmitted together with the link unstableness signal.

7. The node of claim 6 , wherein the link restoration signal is transmitted to the child node based on the link restoration signal being received within the connection recovery time.

8. A processor for a wireless communication device in a wireless communication system,

wherein the processor is configured to control the wireless communication device to

allocate resources to a child node using one of a plurality of resource allocation types; wherein the plurality of resource allocation types comprise i) a first resource allocation type and ii) a second resource allocation type,

wherein, in the first resource allocation type, a bitmap indicates Resource Block Groups (RBGs) that are allocated to the child node,

wherein, in the second resource allocation type, a resource allocation field informs of a starting resource block and a length in terms of contiguously allocated resource blocks that are allocated to the child node,

receive a radio resource control (RRC) signal configuring a due time,

transmit, to the child node, a link unstableness signal informing unstableness of a link based on the link with a parent node being unstable,

monitor whether a link restoration signal is received from the parent node within a connection recovery time, and

transmit a handover trigger signal to the child node based on the link restoration signal being not received within the connection recovery time,

wherein the link is determined to be unstable based on a situation, in which reference signal received power (RSRP) or reference signal received quality (RSRQ) measured in the link is equal to or smaller than a threshold, being maintained for the due time, and

wherein information for a reason with a cause value to support the child node in taking subsequent actions is transmitted together with the link unstableness signal.