Section: 5.23 Autonomous Uplink
Content: Autonomous uplink is supported on the SCells only. At most one autonomous uplink configuration is supported per SCell. Multiple autonomous uplink configurations can be activated and be active simultaneously when there is more than one SCell. Autonomous uplink and Uplink Semi-Persistent Scheduling cannot be active simultaneously on the same SCell. When autonomous uplink is configured by RRC, the following information is provided in AUL-Config (TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8]): - AUL C-RNTI; - HARQ process IDs aul-HARQ-Processes that are configured for autonomous UL HARQ operation, the time period aul-RetransmissionTimer before triggering a new transmission or a retransmission of the same HARQ process using autonomous uplink; - The bitmap aul-Subframes that indicates the subframes that are configured for autonomous UL HARQ operation. When the autonomous uplink configuration is released by RRC, the corresponding configured grant shall be cleared. If AUL-Config is configured, the MAC entity shall: - consider that a configured uplink grant occurs in those subframes for which aul-Subframes is set to 1 (TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8]). If AUL confirmation has been triggered and not cancelled: - if the MAC entity has UL resources allocated for new transmission for this TTI: - instruct the Multiplexing and Assembly procedure to generate an AUL confirmation MAC Control Element as defined in clause 6.1.3.16; - cancel the triggered AUL confirmation. The MAC entity shall clear the configured uplink grant for the SCell immediately after first transmission of AUL confirmation MAC Control Element triggered by the AUL release for this SCell. NOTE: Retransmissions for uplink transmissions using autonomous uplink can continue after clearing the corresponding configured uplink grant.