Section: 5.4.8 E-UTRAN initiated UE Context Modification procedure
Content: When split bearer option is applied to support dual connectivity operation, this procedure is used is by the eNodeB to request the modifications on the established UE Context. In the current version of the specification, this procedure is only used for membership verification, as described in TS 36.300[ Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 ]  [5]. Figure 5.4.7-1: E-UTRAN initiated UE context modification procedure 1. The addition of an hybrid HeNB as the SeNodeB is triggered, providing the CSG-ID and the CSG Membership Information to the MeNodeB. 2. The Master eNodeB sends UE Context Modification Indication message to the MME, which includes the CSG Membership Information of the SeNodeB. 3. The MME verifies the CSG membership based on the provided CSG Membership Information as specified in TS 36.300[ Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 ]  [5], but does not update the User CSG Information in the Core Network. A failure of the CSG Membership Information verification does not impact the E-UTRAN UE Context Modification procedure. 4. The MME confirms the UE Context Modification Indication with the UE Context Modification Confirm (CSG Membership Status) message. If CSG Membership Information was not present in the UE Context Modification Indication message, the MME can not perform CSG Membership Information verification and does not provide CSG Membership Status in the UE Context Modification Confirm message. 5. If the CSG Membership Status returned by the MME is different from what was reported by the UE, the eNodeB may decide on further actions.