Abstract: Disclosed herein are system, method, and computer program product embodiments for implementing prioritized return of a UE to NR RAT from a GSM/UMTS RAT through RAT reselection based approach. An embodiment operates by determining whether the UE is camped on a first radio access technology (RAT), and in response to a determination that the UE is camped on the first RAT, stores a list of frequencies and a plurality of cell reselection parameter values corresponding to the first RAT. The embodiment determines whether the UE is camped on a second RAT and whether one of a plurality of trigger conditions is satisfied, and in response to a determination that the UE is camped on the second RAT and that one of the plurality of trigger conditions is satisfied, performs measurements on one or more frequencies of the list of frequencies. The embodiment performs cell reselection to a cell of the first RAT based at least in part on the measurements and the plurality of cell reselection parameter values.

Abstract: A user equipment (UE) configured to determine, for each radio access technology (RAT) of a plurality of RATs, a first list of bands on which a public land mobile network (PLMN) is expected to be deployed and a second list of bands including bands not included in the first list, wherein the first list is determined based on a region where the UE is currently located and PLMN deployment information, select a search pattern for performing a cell search based on a current UE scenario, perform a first phase of the cell search and when the first phase of the cell search is unsuccessful and no cell is selected, perform a second phase of the cell search by either scanning frequencies included in the second list of bands for the first priority RAT or scanning frequencies included in the first list of bands for a second priority RAT.

Abstract: Techniques are provided for implementing a cell selection procedure to get a user equipment (UE) into service on prioritized RAT after an out-of-service detection. For example, some aspects of this disclosure relate to a method including determining, by a user equipment (UE), whether the UE has a loss of service, and in response to determining that the UE has the loss of service, initiating an initial cell selection (ICS) and starting a timer. The method further includes determining whether a suitable cell is identified during the ICS and determining whether the timer has expired. The method further includes, in response to determining that a suitable cell is not identified during the ICS and the timer has expired, pausing the ICS, and performing an intermediate stored information cell selection (ISICS) to identify a suitable cell.

Abstract: Some aspects of this disclosure relate to apparatuses and methods for the reselection of a Radio Access Technology (RAT) for a multi-mode user equipment (UE). A UE can determine that the UE camps on a first RAT for service by a first public land mobile network (PLMN) and that the UE camps on a second RAT for service by a second PLMN, and store information about the first RAT for the first PLMN. The UE can further determine whether there is a trigger event to enable the UE to switch from the second RAT to the first RAT. In response to a determination that there is the trigger event, the UE can determine whether a cell in the first RAT for the first PLMN is available for the UE to camp on to select the available cell in the first RAT to register the UE with the first PLMN.

Abstract: Briefly, in accordance with one or more embodiments, a method to implement an extended service request procedure for a circuit-switched fallback, comprises communicating with a packet-switched network, and initiating an extended service request procedure for a circuit-switched fallback to handle a voice call. If the voice call is terminated prior to completion of the extended service request procedure, the extended service request procedure may be aborted, and the user may remain in communication with the packet-switched network. Otherwise, the user completes the connection to the circuit-switched network and communicates with a circuit-switched network to handle the voice call.

Abstract: A communication circuit arrangement may include a control circuit configured to receive an initial call notification attempt in idle mode from a first network for an incoming call that originates from a second network, establish an active connection with the first network, trigger a subsequent call notification attempt from the incoming call from the first network by disregarding the initial call notification attempt, and presenting a user with caller identity information for the incoming call provided in the subsequent call notification attempt.

Abstract: A communication circuit arrangement may include a control circuit configured to receive an initial call notification attempt in idle mode from a first network for an incoming call that originates from a second network, establish an active connection with the first network, trigger a subsequent call notification attempt from the incoming call from the first network by disregarding the initial call notification attempt, and presenting a user with caller identity information for the incoming call provided in the subsequent call notification attempt.

Abstract: Briefly, in accordance with one or more embodiments, a method to implement an extended service request procedure for a circuit-switched fallback, comprises communicating with a packet-switched network, and initiating an extended service request procedure for a circuit-switched fallback to handle a voice call. If the voice call is terminated prior to completion of the extended service request procedure, the extended service request procedure may be aborted, and the user may remain in communication with the packet-switched network. Otherwise, the user completes the connection to the circuit-switched network and communicates with a circuit-switched network to handle the voice call.