Section: 6.1.3.14 Activation/Deactivation of CSI-RS resources MAC Control Element
Content: The Activation/Deactivation of CSI-RS resources MAC control element is identified by a MAC PDU subheader with LCID as specified in table 6.2.1-1. It has variable size as the number of CSI process configured with csi-RS-NZP-Activation by RRC, see TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8], (N) and the N number of octets with A fields are included in ascending order of CSI process ID, i.e., CSI-ProcessId, as defined in Figure 6.1.3.14-1. Activation/Deactivation CSI-RS command is defined in Figure 6.1.3.14-2 and activates or deactivates CSI-RS resources for a CSI process. For a UE configured with transmission mode 9, N equals 1. Activation/Deactivation of CSI-RS resources MAC control element applies to the serving cell on which the UE receives the Activation/Deactivation of CSI-RS resources MAC control element. The Activation/Deactivation of CSI-RS resources MAC control elements is defined as follows: - Ai: this field indicates the activation/deactivation status of the CSI-RS resources configured by upper layers for the CSI process. A1 corresponds to the 1st entry in the list of CSI-RS specified by csi-RS-ConfigNZP-ApList as configured by upper layers, A2 corresponds to the 2nd entry in this list and so on. The Ai field is set to "1" to indicate that ith entry in the list of CSI-RS specified by csi-RS-ConfigNZP-ApList shall be activated. The Ai field is set to "0" to indicate that ith entry in the list shall be deactivated. For each CSI process, the number of Ai fields (i=1, 2,…, 8) which are set to "1" shall be equal to the value of the higher-layer parameter activatedResources in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8]. Figure 6.1.3.14-1: Activation/Deactivation of CSI-RS resources MAC Control Element Figure 6.1.3.14-2: Activation/Deactivation CSI-RS command