Section: 4.3.33 Support for Multi-USIM UE 4.3.33.1 General
Content: A network and a Multi-USIM UE may support one or more of the following features for Multi-USIM UE operation: - Connection Release, as described in clause 4.3.33.2. - Paging Cause Indication for Voice Service, as described in clause 4.3.33.3. - Reject Paging Request, as described in clause 4.3.33.4. - Paging Timing Collision Control, as described in clause 4.3.33.5. - Paging Restriction, as described in clause 4.3.33.6. In the Attach procedure (as specified in clause 5.3.2.1), or in the Tracking Area Update procedure (as specified clause 5.3.3), when a Multi-USIM UE has more than one USIM active, supports and intends to use one or more Multi-USIM specific features, it indicates to the MME the corresponding Multi-USIM feature(s) are supported. Based on the received indication of supported Multi-USIM features from the UE, the MME shall indicate to the UE the support of the Multi-USIM features based on the Multi-USIM features supported by network and any preference policy by the network, if available. When a UE returns to having only one USIM active from a Multi-USIM UE that previously indicated to the network it supported Multi-USIM feature(s), the UE shall indicate all the Multi-USIM features are not supported to the network for that USIM. The MME shall only indicate the support of Paging Restriction feature together with the support of either Connection Release feature or Reject Paging Request feature. The Multi-USIM UE includes the support of individual features for Connection Release, Paging Cause Indication for Voice Service, Reject Paging Request and Paging Restrictions as specified in clause 5.11.3. The network shall not indicate support for any Multi-USIM feature to the UE as part of the Emergency Attach procedure or as part of Tracking Area Update for Emergency attached UE. A Multi-USIM UE shall use a separate IMEI for each USIM when it registers with the network.