The UE shall restart retxBSR-Timer upon indication of a grant for transmission of new data on any UL-SCH.

The UE may transmit at most one regular/periodic BSR for uplink transmission and, if possible, at most one MAC BSR CE for D2D transmission in a TTI. If the UE is requested to transmit multiple MAC PDUs in a TTI, it may include a padding BSR in any of the MAC PDUs which do not contain a regular/periodic BSR. For BSRs triggered for uplink transmission over Uu, all BSRs transmitted in a TTI may always reflect the buffer status after all MAC PDUs for uplink transmission have been built for this TTI. Each LCG may report at the most one buffer status value per TTI and this value may be reported in all BSRs reporting buffer status for this LCG. For BSRs triggered for D2D transmission, all BSRs transmitted in a TTI may always reflect the buffer status after all MAC PDUs for D2D transmission have been built until this TTI (including this TTI). Each LCG may report at the most one buffer status value per D2D-TTI or per D2D scheduling period and this value shall be reported in all D2D-BSRs reporting buffer status for this LCG. A padding BSR is not allowed to cancel a triggered regular/periodic BSR. A padding BSR is triggered for a specific MAC PDU only and the trigger is cancelled when this MAC PDU has been built.

(5) New Cancelling Conditions for the Legacy BSR and/or ProSe BSR