Section: 4.3.33.6 Paging Restriction
Content: A Multi-USIM UE and the network may support Paging Restriction. A Multi-USIM UE, if the MME indicates that the network supports Paging Restriction feature, may indicate Paging Restriction Information in an Extended Service Request or a Tracking Area Update Request (including the case where the Tracking Area Update is performed due to mobility to a Tracking Area outside the current Tracking Area List, i.e. before detecting whether the network supports the feature in the new Tracking Area, provided that the network has already indicated support for Paging Restrictions in the current Tracking Area List), as specified in clauses 4.3.33.2 and 4.3.33.4. The MME may accept or reject the Paging Restriction Information requested by the UE. If the MME accepts the Paging Restriction Information from the UE, the MME stores the Paging Restriction Information from the UE in the UE context. If the MME rejects the Paging Restriction Information the MME removes any stored Paging Restriction Information from the UE context and discards the UEs requested Paging Restriction Information. The MME informs the UE about the acceptance/rejection of the requested Paging Restriction Information in the Tracking Area Update Accept or Service Accept message. If the UE does not provide Paging Restriction Information in the Extended Service Request message or the Tracking Area Update Request message, or if the UE initiates the Service Request procedure, the MME removes any stored Paging Restriction Information from the UE context. The Paging Restriction Information may indicate any of the following: a) all paging is restricted, or b) all paging is restricted, except paging for voice service (MMTel voice or CS domain voice), or c) all paging is restricted, except for certain PDN Connection(s), or d) all paging is restricted, except for certain PDN Connection(s) and voice service (MMTel voice or CS domain voice). NOTE 1: The UE expects not to be paged for any purpose in case a). The UE expects to be paged only for voice service in case b). The UE expects to be paged only for certain PDN Connection(s) in case c). The UE expects be paged for voice service and certain PDN Connection(s) in case d). The MME can page the UE for mobile terminated signalling based on local policy considering the stored Paging Restriction Information, except for case a). In this case, to comply with UE provided Paging Restriction Information, the MME can trigger S1 release procedure as soon as possible after the mobile terminated signalling procedure is executed. NOTE 2: In the case of roaming, the paging restrictions for voice service implied by bullet b) and d) depends on the existence of an agreement with the HPLMN to support voice service via IMS. Hence the support of paging restrictions in bullets b) and d) takes the IMS voice service agreement into consideration. NOTE 3: When there is no PLMN-wide support for the Paging Restriction feature, it can occur that upon Tracking Area Update due to mobility with Paging Restriction Information the UE detects the network does not support the feature. If so, the UE assumes that no Paging Restriction is applied.