Threshold-based and power-efficient scheduling request procedure

An integrated circuit for controlling operation of a user equipment, the integrated circuit comprising:

• at least one input node which, in operation, inputs configuration information used to configure a second trigger condition for a logical channel having tolerance for delaying transmission of a scheduling request;
• circuitry, which is coupled to the input node and which, in operation, controls a process comprising:
• determining whether a first trigger condition is fulfilled for the logical channel for which the second trigger condition is configured, the first trigger condition requiring a buffer status report (BSR) being triggered due to data becoming available in a transmission buffer, and
• determining whether the second trigger condition is fulfilled for the logical channel for which the second trigger condition is configured, the second trigger condition requiring a timer related to the data of the transmission buffer being expired,
• wherein the timer is started when the first trigger condition is fulfilled for the logical channel for which the second trigger condition is configured and triggering of a scheduling request transmission is postponed until the timer is expired, and the timer is not started when the first trigger condition is fulfilled for a logical channel for which the second trigger condition is not configured;
• and
• at least one output node, which is coupled to the circuitry and which, in operation, outputs a trigger for transmission of a scheduling request to a radio base station requesting uplink resources when defined conditions are fulfilled including the first and second trigger conditions being fulfilled for the logical channel for which the second trigger condition is configured.