Method and device for avoiding packet loss due to network speed difference in wireless communication system

A method performed by a second node in a wireless communication system, the method comprising:

• receiving, from a first node, a first downlink data delivery status (DDDS) including information on a first desired buffer size (DBS);
• and
• transmitting, to the first node, first downlink data corresponding to the first DBS,
• wherein the first DBS is identified based on at least one of a maximum transmission period of the first DDDS or a size of an empty buffer of the first node.

A first node in a wireless communication system, the first node comprising:

• a transceiver;
• a processor coupled with the transceiver;
• and
• memory storing instructions that, when executed by the processor, cause the first node device to:
• identify a maximum transmission period of a downlink data delivery status (DDDS),
• transmit a first DDDS including information on a first desired buffer size (DBS) to a second node, and
• receive first downlink data identified based on the first DBS from the second node, and
• wherein the first DBS is identified based on at least one of the maximum transmission period or a size of an empty buffer of the first node.

A second node in a wireless communication system, the second node comprising:

• a transceiver;
• a processor coupled with the transceiver;
• and
• memory storing instructions that, when executed by the processor, cause the second node device to:
• receive a first downlink data delivery status (DDDS) including information on a first desired buffer size (DBS) from a first node, and
• transmit first downlink data corresponding to the first DBS to the first node, and
• wherein the first DBS is identified based on at least one of a maximum transmission period of the first DDDS or a size of an empty buffer of the first node.