Abstract: In a mobile device for wireless communication capable of communicating on multiple radio access technologies (RATs), cell selection may be improved by reusing cell measurements for inter-RAT cell selection. This will reduce the number of cell measurements taken and improve mobile device performance. A time threshold may be used to instigate new cell measurement to prevent cell measurement data from being outdated.

Abstract: Aspects of the methods and apparatus include determining that a time-to-trigger (TTT) timer has expired, and determining that a serving radio access technology (RAT) received signal characteristic is less than a signal characteristic threshold when the TTT timer has expired. Further, the aspects include determining, in response to the serving RAT received signal characteristic being less than the signal characteristic threshold, that a target RAT frequency measurement associated with a Measurement Report Message (MRM) for performing an inter-RAT (IRAT) handover cannot be completed within a time limit according to a current measurement gap configuration. Also, the aspects include calculating a measurement gap duration sufficient to complete the target RAT frequency measurement associated with the MRM for performing the IRAT handover, and configuring a new measurement gap prior to the time limit, wherein the new measurement gap comprises the calculated measurement gap duration.

Abstract: Aspects of the methods and apparatus include determining that a time-to-trigger (TTT) timer has expired, and determining that a serving radio access technology (RAT) received signal characteristic is less than a signal characteristic threshold when the TTT timer has expired. Further, the aspects include determining, in response to the serving RAT received signal characteristic being less than the signal characteristic threshold, that a target RAT frequency measurement associated with a Measurement Report Message (MRM) for performing an inter-RAT (IRAT) handover cannot be completed within a time limit according to a current measurement gap configuration. Also, the aspects include calculating a measurement gap duration sufficient to complete the target RAT frequency measurement associated with the MRM for performing the IRAT handover, and configuring a new measurement gap prior to the time limit, wherein the new measurement gap comprises the calculated measurement gap duration.

Abstract: Methods and apparatuses are provided for managing a list of target frequencies for cell measurement. A set of available target frequencies for performing cell measurements from a serving cell can be received, and at least a subset of the set of available target frequencies can be prioritized based at least in part on a list of a plurality of target frequencies stored in a reselection database for the serving cell. Cell measurements can be performed based at least in part on at least the subset of the set of available target frequencies as prioritized. Additionally, the plurality of target frequencies in the reselection database may correspond to target frequencies to which successful reselection has occurred from the serving cell.

Abstract: A user equipment (UE) reselects back to a higher priority radio access technology (RAT) when network configured parameters do not provide sufficient time to perform the IRAT reselection measurements and evaluation due to the UE spending a very short duration in a discontinuous reception (DRX) mode. In one instance, the UE detects a triggering condition for incomplete cell reselection evaluation based on a number of past events. The UE computes a modified reselection timer value based on the past events and applies the modified reselection timer value to future events.

Abstract: A method of wireless communication includes controlling a rate of forced measurement gap requests for a serving radio access technology (RAT) to measure a target RAT based on an impact to quality of service on the serving RAT by forced measurement gaps.

Abstract: A base station may allocate served user equipments (UEs) into measurement gap groups, which are configured to reduce the overlap between UE measurement gaps used for inter-RAT measurement. The base station may configure the measurement gap groups based on an offset between subframes of a served and measured RAT and may distribute UEs in the measurement gap groups to avoid overlapping inter-RAT measurement times, thereby reducing idle base station resources.

Abstract: The present disclosure presents a method and an apparatus for inter-radio access technology (IRAT) background public land mobile network (BPLMN) re-acquisition mechanism at a user equipment (UE). For example, the method may include performing a BPLMN acquisition mechanism at a UE, checking whether a BPLMN re-acquisition mechanism is valid, determining whether the re-acquisition mechanism requirements are met, and performing the re-acquisition mechanism at the UE. As such, an IRAT BPLMN re-acquisition mechanism at a UE is performed.

Abstract: A method for determining candidate radio access technology (RAT) layers includes selecting one or more initial candidate RAT layer, for each configured RAT type of a UE, for a target RAT candidate list. The target can be for redirection or handover, for example. Each initial candidate RAT layer is selected regardless of network indicated RAT priorities and measurement object IDs. The method also includes selecting additional candidate RAT layers, for the list, based on the network indicated RAT priorities or the measurement object IDs. The method may be specified for when a UE is in a connected mode or an idle mode.

Abstract: In mobile user equipment (UE) configured to allow for operation on multiple wireless communication networks, such as on a TD-SCDMA network or on a TDD-LTE network, an improved method for handing over a circuit-switched call is offered. The proposed circuit-witched fallback procedure, employing an improved UE hardware architecture, allows for certain connection setup procedures to occur in parallel, such as the UE pre-acquiring the TD-SCDMA cell. The parallel operations thus speed up the circuit-switched fallback procedure and reduce existing delays in executing circuit-switched fallback from TDD-LTE to TD-SCDMA networks.

Abstract: A method of wireless communication includes receiving a set of frequency layers for intra radio access technology (RAT) inter-frequency cell reselection and/or a set of frequency layers for inter RAT frequency cell reselection. The method also includes storing two or more of the frequency layers in an active search list and storing one or more remaining frequency layers in a dormant search list. The method further includes searching for each frequency layer in the active search list. The method still further includes dynamically updating a measurement list, the active search list, and the dormant search list.

Abstract: When a user equipment is performing a packet-switched handover from a source radio access technology (RAT) to target RAT (such as Long Term Evolution) in connected mode, the UE may indicate a UTRA RAT capability based on an operator of the source RAT or an operator of the target RAT. If the operator is associated with a TD-SCDMA network, the UE may indicate a TD-SCDMA capability. If the operator is not associated with a TD-SCDMA network, the UE may indicate a W-CDMA capability.

Abstract: A method of wireless communication includes determining a threshold based on a signal strength of a strongest candidate target cell of a target radio access technology (RAT) and a previous serving cell of the target RAT. The method also includes pruning a list of candidate target cells of the target RAT based on the threshold. The list is pruned for a handover from a source RAT. The method further includes reporting the pruned list to a base station of the source RAT prior to the handover.

Abstract: In an aspect, methods and apparatus for handover in a communication network includes detecting a network entity handover condition to trigger handover from a source network entity of a first RAT. The methods and apparatus further include receiving a handover message from the source network entity of the first RAT including a list of target network entities. Additionally, the methods and apparatus include conducting handover to a target network entity selected from the list of target network entities. In another aspect, methods and apparatus for handover include receiving a handover request message from a UE at a source network entity of a first RAT. The methods and apparatus further include determining a list of target network entities in response to receiving the handover request message. Additionally, the methods and apparatus include transmitting a handover message including the list of target network entities from the source network entity to the UE.

Abstract: The present disclosure presents a method and an apparatus for inter radio access technology (IRAT) cell reselection. For example, the method may include identifying that a user equipment (UE) in an idle or a discontinuous reception (DRX) mode is camped on a cell of a first RAT, determining that the cell the UE is camped on is not broadcasting any neighbor cell of a second RAT, scanning for one or more frequencies of the second RAT based on the determination, and triggering a cell reselection to a cell of the second RAT, wherein the cell of the second RAT is associated with a frequency identified during the scanning. As such, an autonomous IRAT cell reselection may be achieved.

Abstract: A system and method for deriving cell global identity information are provided. A method for deriving cell global information includes receiving, at a first cell, a measurement report, determining a second identifier for the second cell based on a first identifier and information about the first cell, and adding the second cell to a cell list. The measurement report includes the first identifier of a second cell, and the second identifier is used to reference the second cell.

Abstract: Methods and apparatus for wireless communication in a wireless communication network include maintaining a Public Land Mobile Network (PLMN) list and receiving an information request from a network, wherein the information request is associated with configuration parameters associated with the PLMN list. Aspects of the methods and apparatus configuring the UE based on the configuration parameters associated with the PLMN list. Aspects also include replying to the network that the UE is configured with the configuration parameters associated with the PLMN list.

Abstract: When a user equipment performs inter-cell measurement, it may desire to measure signal quality and signal level of a source radio access technology (RAT) cell and a target cell. The signal quality measurement may be Squal and the signal level measurement may be Srxlev. Because Squal is not defined for TD-SCDMA, a new measurement criteria is defined to allow proper comparison of source RAT cell measurements with target RAT cell measurements when a user equipment is considering switching to a target cell.

Abstract: In a mobile device for wireless communication capable of communicating on multiple radio access technologies (RATs), cell selection may be improved by reusing cell measurements for inter-RAT cell selection. This will reduce the number of cell measurements taken and improve mobile device performance. A time threshold may be used to instigate new cell measurement to prevent cell measurement data from being outdated.

Abstract: In mobile user equipment (UE) configured to allow for operation on multiple wireless communication networks, such as on a TD-SCDMA network or on a TDD-LTE network, an improved method for handing over a circuit-switched call is offered. The proposed circuit-switched fallback procedure, employing an improved UE hardware architecture, allows for certain connection setup procedures to occur in parallel, such as the UE pre-acquiring the TD-SCDMA cell. The parallel operations thus speed up the circuit-switched fallback procedure and reduce existing delays in executing circuit-switched fallback from TDD-LTE to TD-SCDMA networks.