Various example embodiments relate to methods, devices and systems that support flexible uplink resource request. A terminal device may comprise at least one processor and at least one memory including computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the terminal device to perform actions including triggering a buffer status report (BSR) by uplink data arrival on a logical channel, and selectively triggering one or both of a scheduling request (SR) procedure and a random access (RA) procedure based on a predetermined condition for transmission of the triggered buffer status report.