Section: 5.22 Entering Dormant SCell state
Content: If the MAC entity is configured with one or more SCells, the network may transition configured SCells into Dormant State. Dormant State is not applicable for SpCell or PUCCH SCell. The network transitions SCell(s) in and out of Dormant State by sending Activation/Deactivation and/or Hibernation MAC control element as described in clause 6.1.3.8 and 6.1.3.15 respectively. Furthermore, the MAC entity maintains two timers related to the dormant state: - If configured, an sCellHibernationTimer timer per configured SCell (except the SCell configured with PUCCH, if any). Upon the timer expiry, the MAC entity hibernates the associated SCell if it is in activated state. The same initial timer value applies to each instance of the sCellHibernationTimer and it is configured by RRC. - If configured, a dormantSCellDeactivationTimer per configured SCell (except the SCell configured with PUCCH, if any). Upon the timer expiry, the MAC entity deactivates the associated SCell if it is in dormant state. The same initial timer value applies to each instance of the dormantSCellDeactivationTimer and it is configured by RRC. An SCell will be in Dormant SCell state upon SCell configuration in case the parameter sCellState is set to dormant for the SCell within RRC configuration. The configured SCG SCells are dormant after a SCG change in case the parameter sCellState is set to dormant for the SCell within RRC configuration. The MAC entity shall for each TTI and for each configured SCell: - if the MAC entity is configured with dormant SCell upon SCell configuration or receives MAC control element(s) in this TTI for transitioning the SCell into Dormant State: - in the TTI according to the timing defined in TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [2]: - transition the SCell into Dormant State; - stop the sCellDeactivationTimer associated with the SCell; - if sCellHibernationTimer associated with the SCell is configured; - stop the sCellHibernationTimer associated with the SCell; - start or restart the dormantSCellDeactivationTimer associated with the SCell; - clear any configured downlink assignments and uplink grants associated with the SCell; - flush all HARQ buffers associated with the SCell. - if the sCellHibernationTimer associated with the activated SCell expires in this TTI: - in the TTI according to the timing defined in TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [2]: - hibernate the SCell; - stop the sCellDeactivationTimer associated with the SCell; - stop the sCellHibernationTimer associated with the SCell; - start the dormantSCellDeactivationTimer associated with the SCell; - clear any configured downlink assignments and uplink grants associated with the SCell; - flush all HARQ buffers associated with the SCell. - if the dormantSCellDeactivationTimer associated with the dormant SCell expires in this TTI: - in the TTI according to the timing defined in TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [2]: - deactivate the SCell; - stop the dormantSCellDeactivationTimer associated with the SCell; - if the SCell is in Dormant State: - not transmit SRS on the SCell; - report CQI/PMI/RI/PTI/CRI for the SCell according to the periodicity indicated by cqi-ReportPeriodic-SCell-r15; - not transmit on UL-SCH on the SCell; - not transmit on RACH on the SCell; - not monitor the PDCCH on the SCell; - not monitor the PDCCH for the SCell; - not transmit PUCCH on the SCell. HARQ feedback for the MAC PDU containing Hibernation MAC control element shall not be impacted by PCell, PSCell and PUCCH SCell interruptions due to SCell activation/deactivation or hibernation (TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9]). NOTE: When SCell is in Dormant State, any ongoing Random Access procedure on the SCell is aborted.