Abstract: A method of managing evolved universal mobile telecommunication system terrestrial radio access network (E-UTRAN) capability of a user equipment (UE) is provided that includes switching from a first radio access technology (RAT) to a second RAT if the first RAT fails to provide circuit switched (CS) services to the UE, the first RAT and the second RAT being associated with a first public landline mobile network (PLMN). The UE establishes a CS call session with the second RAT. In the meanwhile, the UE receives a network handover command to move to a second PLMN. The UE may also perform a movement from the first PLMN to the second PLMN and connect with a third RAT associated with the second PLMN to continue the CS call session. The UE enables the E-UTRAN capability after moving to the second PLMN to connect with a fourth RAT available in the second PLMN.

Abstract: A method for connecting to a Registered Public Land Mobile Network (RPLMN) after receiving an accept message with limited service from a user selected CSG cell, which is associated to a different PLMN than the RPLMN during manual CSG selection mode is disclosed. The method includes connecting to the RPLMN based on the availability of the user selected CSG cell in UTRAN. If the user selected CSG cell is not available in UTRAN, then the method includes connecting to the RPLMN by the UE using the stored duplicate value of the RPLMN. If the user selected CSG cell is available in UTRAN, then the method includes sending an ATTACH request to the user selected CSG cell without disabling the EUTRA capabilities. If the ATTACH request is failed, then the method includes connecting to the RPLMN using the stored duplicate value of the RPLMN.

Abstract: Disclosed is a system, User Equipment (UE) and method for preventing voice call (VoLTE) call drops in a communication network. A paging message is received as an Internet Protocol Multimedia Subsystem (IMS) invite message. The paging message includes a domain, or the UE establishes a connection with the network, in order to determine whether the IMS invite is for a voice call. A condition of non-sustenance of the voice call is detected based on a power level check for the UE and Extended Service Request (ESR) is triggered. The voice call is continued according to a success or a failure of the ESR.

Abstract: Methods and User Equipment (UE) for managing IMS call over LTE in SRVCC area are provided. The method may include detecting, by an IMS client, that the IMS call over LTE is in an alert state, and a Radio Resource Control (RRC) reconfiguration cells are configured for the IMS call over LTE. Further, the method may include initiating by the IMS client a timer with a value less than a data inactivity timer value from a network entity. Further, the method may include detecting by IMS client that the timer has expired before establishing the IMS call over LTE and restarting by the IMS client the timer. Furthermore, the method may include sending by the IMS client a Session Initiation Protocol (SIP) message to the network entity.

Abstract: A method of selecting a public land mobile network (PLMN) for enabling a user equipment (UE) to communicate and a user equipment are provided. The method includes checking, by the UE, whether an elementary file (EF) is present in a universal integrated circuit card (UICC) inserted in the UE, if the UE initiates a procedure for selecting a PLMN, wherein the EF includes a PLMN selection mode; and selecting, by the UE, a PLMN based on the PLMN selection mode. The UE is configured to check if an EF is present in a UICC inserted in the UE, if the UE initiates a procedure for selecting a PLMN, wherein the EF includes a PLMN selection mode; and select a PLMN based on the PLMN selection mode.

Abstract: A method for optimizing cell selection in a Dual Subscriber Identification Module (SIM) Dual Standby (DSDS) device is provided. The method includes selecting at least one candidate neighbor cell for a first SIM from a mapping table of the DSDS device, the at least one selected candidate neighbor cell corresponding to a cell currently serving a second SIM, wherein the first SIM is out of service and the second SIM is in service, and camping the first SIM onto the at least one selected candidate neighbor cell.

Abstract: A method and user equipment for handling a Public Land Mobile Network (PLMN) selection in a mobile communication network is provided. The method includes obtaining, by a User Equipment (UE), a PLMN list of one or more Radio Access Technologies (RATs) comprising a list of available PLMNs, when the UE performs a Manual Closed Subscriber Group (CSG) selection, initiating a PLMN list validation timer, and reusing the previously obtained PLMN list, when at least one predefined event is triggered and the PLMN list validation timer is running. The at least one predefined event comprises at least one of Home Public Land Mobile Network (HPLMN) timer expiration, a manual PLMN selection, the manual CSG selection, and autonomous CSG selection.

Abstract: A method and an apparatus are provided for processing a Circuit-Switched (CS) call by User Equipment (UE) that is camped on a CSG cell, when a manually selected CSG cell is in a Public Land Mobile Network (PLMN), which is different from a Registered PLMN (RPLMN). The method includes registering, by the UE, with a manually selected Closed Subscriber Group (CSG) cell of a Public Land Mobile Network (PLMN), which is different from a Registered PLMN (RPLMN) of the UE; detecting the CS call; and processing the CS call in a non-CSG cell, when the manually selected CSG cell is unable to process the CS call.

Abstract: Methods and apparatuses are provided for handling Internet protocol (IP) multimedia subsystem (IMS) and circuit switch fall back (CSFB) calls at a user equipment (UE) in a wireless network. A non-access stratum (NAS) of the UE receives an IMS indication when an IMS call is initiated at the UE. The NAS determines a state of the UE. The NAS performs an action based on the state of the UE to trigger one of the IMS call and a CSFB call.

Abstract: A user equipment (UE) and method for controlling the UE are provided. The UE includes a memory configured to store network identification information, the network identification information including information about a Radio Access Technology (RAT) corresponding to a type of a network; and a communication device comprising a transceiver, and a processor configured to control the transceiver, in response to a network reselection event while the UE is connected to a first network, to connect the UE to a second network based on the network identification information.

Abstract: A method of reducing delay in Circuit Switched FallBack (CSFB) in a Radio Access Technology (RAT) communications network. The method includes initiating, by a terminal, a combined attach procedure by sending an attach request message to the RAT communications network, receiving, by the terminal, an attach accept message along with Location Area Identification (LAI) information from the network in response to the attach request message, checking, by the terminal, network identifier information in a RAT information table based on the received LAI, and selecting a mobile network based on the network identifier information to trigger establishment of a circuit-switched call.

Abstract: A method for connecting to a Registered Public Land Mobile Network (RPLMN) after receiving an accept message with limited service from a user selected CSG cell, which is associated to a different PLMN than the RPLMN during manual CSG selection mode is disclosed. The method includes connecting to the RPLMN based on the availability of the user selected CSG cell in UTRAN. If the user selected CSG cell is not available in UTRAN, then the method includes connecting to the RPLMN by the UE using the stored duplicate value of the RPLMN. If the user selected CSG cell is available in UTRAN, then the method includes sending an ATTACH request to the user selected CSG cell without disabling the EUTRA capabilities. If the ATTACH request is failed, then the method includes connecting to the RPLMN using the stored duplicate value of the RPLMN.

Abstract: A method for handling an ATTACH reject message with packet radio service mobility management reject cause number (#14 cause) at a user equipment (UE) is provided. The method includes receiving, at the UE, an ATTACH accept message for a network service on a public land mobile network (PLMN) from a first network entity, wherein the PLMN is in a “forbidden PLMNs for general packet radio service (GPRS) service” list, detecting, by the UE, that the UE's evolved universal terrestrial radio access (E-UTRA) capability is disabled, and enabling, by the UE, the UE's E-UTRA capability and removing the PLMN from the “forbidden PLMNs for GPRS service” list.

Abstract: A method for optimizing cell selection in a Dual Subscriber Identification Module (SIM) Dual Standby (DSDS) device is provided. The method includes selecting at least one candidate neighbor cell for a first SIM from a mapping table of the DSDS device, the at least one selected candidate neighbor cell corresponding to a cell currently serving a second SIM, wherein the first SIM is out of service and the second SIM is in service, and camping the first SIM onto the at least one selected candidate neighbor cell.

Abstract: A method of selecting a public land mobile network (PLMN) for enabling a user equipment (UE) to communicate and a user equipment are provided. The method includes checking, by the UE, whether an elementary file (EF) is present in a universal integrated circuit card (UICC) inserted in the UE, if the UE initiates a procedure for selecting a PLMN, wherein the EF includes a PLMN selection mode; and selecting, by the UE, a PLMN based on the PLMN selection mode. The UE is configured to check if an EF is present in a UICC inserted in the UE, if the UE initiates a procedure for selecting a PLMN, wherein the EF includes a PLMN selection mode; and select a PLMN based on the PLMN selection mode.

Abstract: Disclosed is a system, User Equipment (UE) and method for preventing voice call (VoLTE) call drops in a communication network. A paging message is received as an Internet Protocol Multimedia Subsystem (IMS) invite message. The paging message includes a domain, or the UE establishes a connection with the network, in order to determine whether the IMS invite is for a voice call. A condition of non-sustenance of the voice call is detected based on a power level check for the UE and Extended Service Request (ESR) is triggered. The voice call is continued according to a success or a failure of the ESR.

Abstract: A method and user equipment for handling a Public Land Mobile Network (PLMN) selection in a mobile communication network is provided. The method includes obtaining, by a User Equipment (UE), a PLMN list of one or more Radio Access Technologies (RATs) comprising a list of available PLMNs, when the UE performs a Manual Closed Subscriber Group (CSG) selection, initiating a PLMN list validation timer, and reusing the previously obtained PLMN list, when at least one predefined event is triggered and the PLMN list validation timer is running. The at least one predefined event comprises at least one of Home Public Land Mobile Network (HPLMN) timer expiration, a manual PLMN selection, the manual CSG selection, and autonomous CSG selection.

Abstract: An apparatus and method are provided for reducing power consumption in a user equipment (UE). The method includes establishing, by the UE, a connection with a network; receiving, by the UE, from the network, system information of at least one of a resident cell and a neighboring cell indicating if a network feature is supported by the at least one of the resident cell and the neighboring cell; determining, by the UE, if a selection criteria of a cell from among the at least one of the resident cell and the neighboring cell, which supports the network feature, is greater than a threshold; reselecting the cell having the selection criteria that is greater than the threshold; and initiating a connection establishment with the reselected cell, which supports the network feature.

Abstract: A system and method are provided for reducing signaling overhead in a wireless communication system. The method includes establishing device-to-device communication between a first User Equipment (UE1) and a second User Equipment (UE2) over a locally routed data path; sending, by the UE1, a signal quality measurement report to a network; identifying, by the network, that the UE1 is locally routed for proximity services with the UE2; applying, by the network, cell biasing to a serving cell for at least one of the UE1 or the UE2; verifying, after the cell biasing, whether the at least one of the UE1 or the UE2 sustains a connection with the serving cell; and continuing the proximity services through the locally routed data path, if the at least one of the UE1 or the UE2 sustains the connection with the serving cell.

Abstract: A method and an apparatus are provided for processing a Circuit-Switched (CS) call by User Equipment (UE) that is camped on a CSG cell, when a manually selected CSG cell is in a Public Land Mobile Network (PLMN), which is different from a Registered PLMN (RPLMN). The method includes registering, by the UE, with a manually selected Closed Subscriber Group (CSG) cell of a Public Land Mobile Network (PLMN), which is different from a Registered PLMN (RPLMN) of the UE; detecting the CS call; and processing the CS call in a non-CSG cell, when the manually selected CSG cell is unable to process the CS call.