This disclosure above describes a method, a device, and a system for transmitting and receiving resource request indications. Performed by a wireless terminal in a wireless network, the method includes transmitting, to a wireless communication node in the wireless network, indication information indicating a requested data size for transmitting UL traffic to the wireless communication node, wherein the requested data size is not in a base data size table. Another method, performed by a wireless communication node, includes receiving, from a wireless terminal, indication information indicating a requested data size for transmitting UL traffic to the wireless communication node, wherein the requested data size is not in a base data size table.