Section: 5.17 Data inactivity monitoring
Content: The MAC entity may be configured by RRC with a Data inactivity monitoring functionality, when in RRC_CONNECTED. RRC controls Data inactivity operation by configuring the timer DataInactivityTimer. When DataInactivityTimer is configured, the MAC entity shall: - if the MAC entity receives the MAC SDU for DTCH logical channel , DCCH logical channel, or CCCH logical channel; or - if the MAC entity transmits the MAC SDU for DTCH logical channel, DCCH logical channel; - start or restart DataInactivityTimer. - if DataInactivityTimer expires, indicate the expiry of DataInactivityTimer to upper layers.