Abstract: Devices and methods for handling phone calls. One device is a user equipment (UE) configured to establish a connection with a first evolved Node B (eNB). A method includes transmitting an invite signal to a further UE for a Voice over LTE (VoLTE) call, receiving an accept signal from the further UE, receiving a fail signal from the first eNB that a dedicated bearer is unavailable, generating a trigger signal in response to receiving the fail signal and transmitting the trigger signal to the first eNB. Another device is a base station (e.g., eNB) that receives a VoLTE call request from a UE, determines whether the eNB has sufficient resources to provide a dedicated bearer. When it is determined the eNB has insufficient resources, the eNB determines whether a further eNB has sufficient resources to provide the dedicated bearer, and determines whether the UE can connect to the further eNB.

Abstract: A method is disclosed for coordinating a user equipment's communication with a network during tune back with C-DRX (connected mode discontinuous receive). When a user equipment tunes back to a network after a tune away or a signal fade, a scheduling request is sent to the network to indicate the tune back as quickly as possible. The user equipment waits for a downlink transmission from the network. When the user equipment does not receive the downlink transmission, the method determines if the connection between the user equipment and the network has been released. The sending of the first scheduling request and any additional scheduling requests is coordinated with the C-DRX configuration so as to maximize the battery savings of C-DRX and minimize the latency of the tune back process in case the user equipment has uplink data to send.

Abstract: This disclosure relates to network infrastructure identification by a wireless user equipment (UE) device. According to one embodiment, one or more requests for infrastructure identification information may be transmitted. Each request may indicate a current location of the UE. A respective response may be received to each corresponding respective request. Each respective response may include infrastructure identification information for the current location indicated in the corresponding respective request. Features such as vendor, type, model, or version of cellular network infrastructure equipment with which the UE performs cellular communication may be identified based on the response(s), and features specific to the identified equipment may accordingly be implemented during such cellular communication.

Abstract: This disclosure relates to techniques for enabling a user equipment (UE) to determine which cell to attach to in a heterogeneous network (HetNet). The UE may determine, based on the quality of the downlink (DL) channel and/or on the type of traffic between the UE and a current base station, whether to attach to a small cell base station or an overlay macro base station in the cellular network. Particularly, the UE may determine whether to use a received mobility offset during cell reselection in response to a measured quality of the DL channel.

Abstract: Apparatus, system and methods for evaluating link quality within a cellular system. A user equipment (“UE”) is connected to a network, wherein the UE communicates data to the network on an uplink (“UL”) link. The UE determines a requested buffer size for a UL communication, determines a transport block size for the UL communication based on a primary set of allocation parameters, and compares the requested buffer size to the transport block size to determine if a data rate for the UL communication satisfies a threshold. When the data rate satisfies the threshold, the UE identifies the UL link as a good quality link and sends acceptable link quality feedback to the network. When the data rate does not satisfy the threshold, the UE performs a further action to test a quality of the UL link.

Abstract: A user equipment (UE) and corresponding methods to conserve power by the UE. The UE includes a transceiver, the transceiver configured to enable the UE to establish a connection with a Long Term Evolution (LTE) network and configured to operate using a Connected Discontinuous Reception (CDRX) functionality. The processor controls the transceiver by receiving an uplink (UL) grant at a first subframe of a frame of a cycle of the CDRX functionality, transmitting data based upon the UL grant at a predetermined second subframe, and receiving a response from the LTE network corresponding to one of an acknowledgement (ACK) and a negative ACK (NACK) at a predetermined third subframe. The processor deactivates the transmitter for a remainder of the frame based or deactivates a receiver for a remainder of the frame based upon whether the ACK is received.

Abstract: A method for triggering cell transition in an uplink power limited condition is disclosed. The method can include a wireless communication device determining that the wireless communication device is experiencing an uplink power limited condition; deriving a modified downlink channel quality measurement by adjusting a measured downlink channel quality to indicate a lower downlink channel quality than the measured downlink channel quality; generating a measurement report including the modified downlink channel quality measurement; and sending the measurement report to the serving cell to trigger transition of the wireless communication device from the serving cell to a second cell.

Abstract: A method for handling a missed rank report during a tune-away period is provided. The method can include a wireless communication device tuning away from a first network to a second network for a tune-away period; returning to the first network from the tune-away period; determining that a scheduled rank report was missed during the tune-away period; generating a Channel State Indicator (CSI) report based on a previously defined Rank Indicator (RI) value known to the first network in response to missing the scheduled rank report; and sending the CSI report to the first network.

Abstract: This disclosure relates to techniques for scheduling radio resource control connections between a wireless device and a network element of a network in advance. According to some embodiments, a wireless device may provide an indication of one or more types of upcoming data traffic to the network element. The network element may schedule one or more radio resource control connections for the wireless device based at least in part on the indication of one or more types of upcoming data traffic. The network element may provide an indication of the scheduled radio resource control connection(s) to the wireless device. The wireless device and the network may establish the scheduled radio resource control connection at the scheduled time.

Abstract: QoS based uplink data buffering while TTI bundling is enabled by a wireless user equipment (UE) device. The UE may establish a packet-switched connection with a network via a wireless link. The UE may receive, at a media access control (MAC) layer, an indication to enable TTI bundling. The UE may selectively buffer uplink data at an application layer based on the indication to enable TTI bundling. The uplink data may be buffered selectively based on Quality of Service (QoS) considerations. Uplink transmissions may subsequently be performed using TTI bundling.

Abstract: In some embodiments, a UE is configured to, in response to detecting an absence of received packets associated with a voice call over a first time interval of a pre-determined length, initiate transmission of a first control packet to a base station. In some embodiments, the UE is further configured, based on a response to the first control packet, not to drop the packet-switched voice call at least until expiration of a second time interval of a pre-determined length after transmission of the first control packet. In some embodiments, the absence of received packets is an absence of both voice and silence packets. In some embodiments, based on absence of a response to the first control packet, the UE is configured to drop the packet-switched call.

Abstract: A method for providing indication of an SRVCC handover is disclosed. The method can include a first wireless communication device participating in a voice call with a second wireless communication device via a connection between the first wireless communication device and a first network. The method can further include the first wireless communication device determining a condition indicative of an impending SRVCC handover of the first wireless communication device from the first network to a legacy network. In response to the condition, the method can additionally include the first wireless communication device formatting a message including an indication that the first wireless communication device is going to perform the SRVCC handover and sending the message to the second wireless communication device prior to performance of the SRVCC handover.

Abstract: A method for offloading a video portion of a video call form a cellular network to a WLAN is provided. The method can include a wireless communication device participating in a video call with a remote device over a connection between the wireless communication device and a cellular network. The video call can include a first video stream carried over a first bearer on the cellular network and an audio stream carried over a second bearer on the cellular network. The method can further include the wireless communication device establishing a connection between the wireless communication device and a WLAN; performing a call setup procedure with the remote device to establish a second video stream over the WLAN; terminating the first video stream; and using the second video stream and the audio stream to continue the video call.

Abstract: A system and methodology that can limit and manage the number of multiple radio access bearer (mRAB) initiations, which are transitions from a Circuit Switched (CS) voice session, is provided. Moreover, the system, within a Radio Access Network (RAN), can identify vulnerable radio conditions for a user equipment (UE) on an uplink (UL) and/or a downlink (DL), and then subsequently determines whether a Packet Switched (PS) data session is allowed to pass through to the UE, during a CS voice call. In addition, the system can temporarily block a network-initiated data request to the existing CS voice call, if the voice call is likely to be dropped on initiating an mRAB. As the vulnerable radio conditions improve, the system can deliver the previously blocked data request to the UE.

Abstract: Described herein are systems and methods for prioritizing frequency selection of a user equipment (“UE”) having a transceiver configured to enable the UE to establish a connection with a network using at least two communication protocols. A method may comprise recording, at the UE, a camped frequency and a camped band with which the UE is communicating with the first network in the first protocol, disconnecting from the first network and connecting to the second network, and disconnecting from the second network and reconnecting to the first network, wherein the reconnecting to the first network includes determining whether one of the camped frequency or a different frequency within the camped band is available for reconnection to the first network, and reconnecting to the first network using the one of the camped frequency or the different frequency within the camped band.

Abstract: A user equipment and a method performed by the user equipment that has a transceiver configured to enable the user equipment to establish a connection with a first network and a second network. The method including establishing a connection to each of the first network and the second network, tuning away from the first network to the second network, tuning back to the first network from the second network and determining whether to perform a network operation with the first network after tuning back to the first network.

Abstract: This disclosure relates to techniques for scheduling radio resource control connections between a wireless device and a network element of a network in advance. According to some embodiments, a wireless device may provide an indication of one or more types of upcoming data traffic to the network element. The network element may schedule one or more radio resource control connections for the wireless device based at least in part on the indication of one or more types of upcoming data traffic. The network element may provide an indication of the scheduled radio resource control connection(s) to the wireless device. The wireless device and the network may establish the scheduled radio resource control connection at the scheduled time.

Abstract: A system and methodology that can limit and manage the number of multiple radio access bearer (mRAB) initiations, which are transitions from a Circuit Switched (CS) voice session, is provided. Moreover, the system, within a Radio Access Network (RAN), can identify vulnerable radio conditions for a user equipment (UE) on an uplink (UL) and/or a downlink (DL), and then subsequently determines whether a Packet Switched (PS) data session is allowed to pass through to the UE, during a CS voice call. In addition, the system can temporarily block a network-initiated data request to the existing CS voice call, if the voice call is likely to be dropped on initiating an mRAB. As the vulnerable radio conditions improve, the system can deliver the previously blocked data request to the UE.

Abstract: A method for reducing packet loss during data transfer from a network to a wireless communication device over a connection is disclosed. The method can include the wireless communication device signaling a first receive window size for a data transfer; determining occurrence of an event resulting in an interruption of the connection; and, in response to determining occurrence of the event, signaling a second receive window size for the data transfer prior to the event to trigger an adjustment of a data rate of the data transfer in preparation for the event.

Abstract: A method for offloading a video portion of a video call form a cellular network to a WLAN is provided. The method can include a wireless communication device participating in a video call with a remote device over a connection between the wireless communication device and a cellular network. The video call can include a first video stream carried over a first bearer on the cellular network and an audio stream carried over a second bearer on the cellular network. The method can further include the wireless communication device establishing a connection between the wireless communication device and a WLAN; performing a call setup procedure with the remote device to establish a second video stream over the WLAN; terminating the first video stream; and using the second video stream and the audio stream to continue the video call.