Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines that a disaster condition applies to the UE. In response to determining that the disaster condition applies, the UE selects a Public Land Mobile Network (PLMN) for disaster roaming services. The selected PLMN is associated with at least one tracking area identity (TAI) that is included in a forbidden tracking area identity list stored in the UE. The UE attempts to register with the selected PLMN using the at least one TAI.

Abstract: Techniques pertaining to configuration of Timer T3245 and power saving mode optimization in mobile communications are described. An apparatus (e.g., a user equipment (UE)) determines that a condition exists. In response to the determining, the apparatus keeps a timer T3245 running in an event that the timer T3245 is already running. The condition may involve: (1) an unavailability period being activated for a discontinuous coverage; and/or (2) the unavailability period being activated; and/or (3) a mobile-initiated connection-only (MICO) mode being activated; and/or (4) a power saving mode (PSM) being activated.

Abstract: A system and method for wireless communication are disclosed herein. In one embodiment, a wireless communication device receives an authentication reject message from a wireless communication node as part of a procedure. In response to receiving the authentication reject message, the wireless communication device deletes a network list to which the wireless communication node belongs. The network list may include a Public Land Mobile Network (PLMN) list or an equivalent Standalone Non-Public Network (SNPN) list. Additionally, the wireless communication device may reset various counters, including a registration attempt counter, an attach attempt counter, a service attempt counter, and a Tracking Area Update (TAU) attempt counter. The procedure may be a registration procedure, an attach procedure, or a Tracking Area Update (TAU) procedure. The system and method may also be implemented in an apparatus comprising a transceiver and a processor configured to perform the described operations.

Abstract: A system and method for managing network availability for Internet Protocol Multimedia Subsystem (IMS) services are disclosed herein. In one embodiment, the system and method are configured to maintain a plurality of networks indicated as unavailable for an IMS service, and delete a network from the plurality upon identifying that it becomes available for the IMS service. The method includes monitoring for network availability changes and updating network selection priorities accordingly. The system comprises a wireless communication device with a transceiver for communicating with wireless communication nodes and a processor for executing the network management operations.

Abstract: Techniques pertaining to handling procedure performed on a restricted radio access technology (RAT) in mobile communications are described. An apparatus (e.g., a UE) initiates a procedure with a network. The apparatus then receives from the network, responsive to the initiating, a reject message with a cause indicating that a RAT attempted to be accessed by the apparatus is restricted. In response to receiving the reject message, the apparatus selects another RAT or a new public land mobile network (PLMN).

Abstract: A method based on a network slice usage control and a user equipment (UE) are provided. The method based on the network slice usage control comprises the following steps. A slice deregistration inactivity timer is started when there is no established Protocol Data Unit (PDU) session. The slice deregistration inactivity timer is stopped when a user equipment (UE) enters a 5th Generation Mobility Management DEREGISTERED (5GMM-DEREGISTERED) state, and the slice deregistration inactivity timer is running.

Abstract: Solutions pertaining to user equipment (UE) behavior for failed registration request or service request for emergency services fallback in mobile communications are proposed. An apparatus implemented in a UE determines a failure in attempting to initiate a mobility registration request procedure or a service request procedure with a network to perform an emergency service fallback. In response to the determining, the apparatus performs one or more operations including at least a UE non-access-stratum (NAS) layer in a 5th Generation Mobility Management (5GMM) protocol informing an upper layer in the 5GMM protocol of the failure to cause the upper layer to attempt an emergency call in a different domain or via a different network.

Abstract: A user equipment and a method to exempt emergency services fallback procedure due to insecure steering of roaming (SOR) are provided. The method for operating the UE includes: monitoring an operation of the UE; and allowing the UE to establish a new N1 NAS signaling connection for initiating a registration procedure for an emergency services fallback procedure, during the UE attempts to obtain service on a higher priority PLMN.

Abstract: A method to recover from a forbidden tracking area identity (FTAI) after no slices available in a network is provided. The method is applied to user equipment. The method includes the following steps. A reject cause #62 (no network slices available) in a message is received from the network. There is an allowed network slice selection assistance information (NSSAI) or configured NSSAI in the message. All single-NSSAI (S-NSSAI) in the allowed NSSAI and the configured NSSAI are rejected, and at least one S-NSSAI is rejected due to “S-NSSAI not available in a current registration area”. A suitable cell in another tracking area is sought.

Abstract: A UE receives, from a network, an indication of a change in a radio access network (RAN) timing synchronization status while at least one of a first timer and a second timer is running on the UE. The first timer is associated with a registration attempt counter or registration procedure. The second timer is associated with a service request attempt counter or service request procedure. The UE initiates, in response to receiving the indication, at least one of a registration procedure and a service request procedure with the network while the at least one of the first timer and the second timer is running.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a UE. In certain configurations, the UE maintains a closed access group (CAG) information list including an entry. The UE supports enhanced CAG information. The entry includes an allowed CAG list associated with a current public land mobile network (PLMN). The allowed CAG list includes one or more CAG IDs. The UE accesses the current PLMN via a current CAG cell with a CAG ID. The CAG ID is determined as being authorized based on the allowed CAG list associated with the current PLMN. In response to a first event, the UE performs one or more of actions, including: aborting an ongoing UE-initiated 5GMM procedure if the ongoing UE-initiated 5GMM procedure exists, and locally releasing a non-access stratum (NAS) signaling connection if the NAS signaling connection exists.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a UE. In certain configurations, the UE initiates a first 5GMM procedure over a first standalone non-public network (SNPN) providing localized services. In response to a first event, the UE performs one or more actions, including: aborting the first 5GMM procedure, resetting a corresponding procedure attempt counter for the first 5GMM procedure, stopping a corresponding timer for the first 5GMM procedure, releasing locally a non-access stratum (NAS) signaling connection if the NAS signaling connection exists, and entering a public land mobile network (PLMN) search state to perform a SNPN selection procedure.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a MS. In certain configurations, the MS supports access to a selected standalone non-public network (SNPN) providing access for localized services and is in automatic SNPN selection mode. The MS determines whether the MS has an emergency service ongoing. In response to determining the MS does not have the emergency service ongoing, the MS perform a SNPN selection procedure upon a first event being triggered. In response to determining the MS has the emergency service ongoing, the MS determines whether validity information for the selected SNPN is no longer met. In response to determining that the validity information for the selected SNPN is no longer met, the MS performs local release of all emergency PDU sessions except for an emergency PDU session.

Abstract: A method and a user equipment to activate an unavailability period during an active Non-Access Stratum (NAS) congestion in a wireless communication network are provided. The method includes: detecting that timer T3346 is running; and reporting, by user equipment (UE), an Unavailability information with a value of the unavailability period, while the timer T3346 is running or is deactivated.

Abstract: A method and a user equipment to deactivate an unavailability period in a deregistered state in a wireless communication network are provided. A method to deactivate an unavailability period in a deregistered state in a wireless communication network is provided. The method includes: detecting whether a user equipment (UE) performs an initial registration to come out of the unavailability period and resume normal services; and controlling the user equipment (UE) in the deregistered state to initiate a registration procedure for initial registration, when the user equipment (UE) performs initial registration to come out of the unavailability period and resume the normal services.

Abstract: A method for indicating discontinuous satellite coverage and a user equipment (UE) using the same are provided. The user equipment (UE) includes a terminal equipment (TE) and a mobile termination (MT). The terminal equipment (TE) is for providing services to a user of the user equipment (UE). The mobile termination (MT) is further configured to send to the terminal equipment (TE) an information for indicating a discontinuous satellite coverage.

Abstract: A method to access a stand-alone non-Public network (SNPN) in a forbidden SNPN (FSNPN) and a forbidden tracking area identity (FTAI) list is provided. The method is applied to a mobile station (MS). The method includes the following steps. An SNPN selection mode procedure is performed to camp on a cell of a user selected SNPN. It is determined that the selected SNPN is present in the FSNPN list or a tracking area identity (TAI) of the camped cell is in the FTAI list. An SNPN is selected by a user. Contents of FSNPN list and the FTAI list for the selected SNPN are ignored. Registration on the selected SNPN is initiated using specific access technology.

Abstract: Solutions pertaining to user equipment (UE) behavior for UE behavior for emergency services failure due to lower layer failure are proposed. An apparatus (e.g., UE) determines that a lower layer failure occurred during a mobility and periodic registration update (MRU) procedure or a service request (SR) procedure being performed for initiating an emergency protocol data unit (PDU) session with a network for establishing an emergency call. In response, the apparatus performs one or more operations comprising a UE non-access stratum (NAS) layer in a 5th Generation Mobility Management (5GMM) protocol stack informing one or more upper layers of the 5GMM protocol stack of a failure of the MRU or SR procedure for accessing the network such that an upper layer of the 5GMM protocol stack initiates a mechanism for remedying the failure, or performing a local de-registration and attempting to initiate an initial registration for emergency services with the network.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be a method of performing a radio access technology (RAT) network change by a UE. The apparatus may be a UE. In certain configurations, the UE performs first inter-system change from a first radio access technology (RAT) network to a second RAT network. In response to failing the first inter-system change, the UE performs second inter-system change from the second RAT network to a third RAT network by performing an initial attach procedure or an initial registration procedure in the third RAT network.

Abstract: Solutions pertaining to adjusted public land mobile network (PLMN) search in mobile initiated connection only (MICO) mode in mobile communications are proposed. An apparatus implemented in a UE activates a MICO mode. The apparatus then postpones a periodic PLMN search in response to the UE being in the MICO mode, with the periodic PLMN search being controlled by a timer.