Abstract: A method includes determining an estimate of a data packet path time from a first base station 13 to a user equipment (UE), and determining, based at least partially upon a communication received from a second base station 15, an estimate of a data packet path time from the first base station 13 via the second base station 15 to the user equipment (UE) 10. The method includes, based at least partially upon the determined estimates, selecting either the first base station 13 or the second base station 15 to transmit a packet data unit (DPU) (PDU) to the user equipment (UE) 10.

Abstract: Disclosed is a User Equipment UE, which establishes connection with a macro eNB (or master eNB) and a small cell eNB (or secondary eNB), measures channel quality (CQI) of a signal received from the small cell eNB, derives a second channel quality based on the measured channel quality of the signal received from the small cell eNB, transmits information associated with the measured channel quality of the signal to the small cell eNB and transmits information associated with the second channel quality to the macro eNB.

Abstract: Systems, methods, apparatuses, and computer program products for enhancing the setup of carrier aggregation (or dual connectivity or multi connectivity or stand-alone LTE/LTE-like on unlicensed band or LAA or LTE-WLAN aggregation) from IDLE mode (or semi-idle or semi-connected or suspended state) are provided. One method includes providing an indication, to at least one UE, of (or configuring the UE with) potential inter-frequency carriers that the UE should measure during IDLE mode (or during semi-idle or semi-connected or suspended state) for potential SCells. The method may further include during or after RRC connection establishment, receiving an indication from the at least one UE that it has inter-frequency carrier(s) and/or SCell measurement results available, and based on the received measurement results, configuring carrier aggregation (or dual connectivity or multi connectivity or LAA or LTE-WLAN aggregation) without further measurements and activating the SCell.

Abstract: Systems, methods, apparatuses, and computer program products for the indication of full configuration in handover signaling are provided. For example, an indication of “full configuration” and/or “no full configuration” may be included in handover signaling over X2 and/or S1 interface to a source eNB.

Abstract: A primary connection to a user terminal configured to operate using dual connectivity is maintained. A first control interface is maintained to a first radio node maintaining a secondary connection to the user terminal configured to operate using dual connectivity, the first radio node providing a local gateway for the user terminal. A second control interface is maintained to a core network and a local gateway towards a core network is emulated by providing control plane functions of the local gateway provided by the first radio node towards the core network over the second control interface. Local gateway related control messages are relayed between the core network and the first radio node over the first control interface.

Abstract: Handover failure modes are identified by logging information associated with at least one of a handover failure or a radio link failure. The information identifies whether or not a user equipment was engaged in an exchange of at least one of data traffic or control traffic with a network at the time that the handover failure or radio link failure occurred. The information is stored in a non-transitory computer-readable medium, and the information is reported to the network. The information is reported using a radio link failure or connection failure information signaling message. The severity of the handover failure or radio link failure is evaluated based upon the information.

Abstract: A network configuration and process are disclosed in which a user equipment preserves its physical uplink control channel resources (PUCCH) in connected mode when so instructed by the network upon expiration of a time alignment timer. Upon re-initiation of network messaging the network passes information to the user equipment during random access signalling to re-use the physical uplink control channel resources.

Abstract: Disclosed is a User Equipment UE, which establishes connection with a macro eNB (or master eNB) and a small cell eNB (or secondary eNB), measures channel quality (CQI) of a signal received from the small cell eNB, derives a second channel quality based on the measured channel quality of the signal received from the small cell eNB, transmits information associated with the measured channel quality of the signal to the small cell eNB and transmits information associated with the second channel quality to the macro eNB.

Abstract: Methods and apparatus, including computer program products, are provided for dual connectivity. In one aspect there is provided a method. The method may include switching, by a user equipment, between a first carrier associated with a first base station and a second carrier associated with a second base station, wherein the switching is performed based on at least a configuration defining when to perform the switching; and indicate an extension of a time allocated by the configuration at the first base station. Related apparatus, systems, methods, and articles are also described.

Abstract: Methods and apparatus, including computer program products, are provided for dual connectivity. In one aspect there is provided a method. The method may include detecting, at a user equipment configured for dual connectivity to a secondary cell and a primary cell, a radio link failure with the secondary cell; and reporting, in response to the detected radio link failure, an indication of the radio link failure with the secondary cell, wherein the user equipment maintains connectivity with the primary cell despite the radio link failure with the secondary cell. Related apparatus, systems, methods, and articles are also described.

Abstract: An apparatus 310 employable in a communication system configured to determine a value for a new data indicator for semi-persistently allocated or scheduled resources. In one embodiment, the apparatus 310 includes a processor 320 configured to receive a cell radio network temporary identifier indicating a semi-persistent scheduling. The processor 320 is also configured to treat a reception of data with a new data indicator flag in accordance with the semi-persistent scheduling as one of a persistent initial transmission if a value of the new data indicator flag is equal to a first predefined value, and a retransmission of semi-persistent scheduling data if the value of the new data indicator flag is equal to a second predefined value.

Abstract: A network configuration and process are disclosed in which a user equipment preserves its physical uplink control channel resources (PUCCH) in connected mode when so instructed by the network upon expiration of a time alignment timer. Upon re-initiation of network messaging the network passes information to the user equipment during random access signalling to re-use the physical uplink control channel resources.

Abstract: Methods and apparatus, including computer program products, are provided for dual connectivity. In one aspect there is provided a method. The method may include alternating access, by a user equipment during a transition between a first base station and a second base station, to the first base station and the second base station, wherein the alternating is performed during the transition in accordance with a schedule. Related apparatus, systems, methods, and articles are also described.

Abstract: A method, apparatus and computer program product are provided in order to cause a timing alignment timer or a plurality of timing alignment timers to be reset based on a timing alignment timer message. In this regard, a method is provided that provides receiving a message. The method further includes determining whether the message includes a restart indication. The method additionally includes causing a plurality of timing alignment timers to be restarted in an instance in which the message includes a restart indication.

Abstract: An apparatus 310 employable in a communication system configured to determine a value for a new data indicator for semi-persistently allocated or scheduled resources. In one embodiment, the apparatus 310 includes a processor 320 configured to receive a cell radio network temporary identifier indicating a semi-persistent scheduling. The processor 320 is also configured to treat a reception of data with a new data indicator flag in accordance with the semi-persistent scheduling as one of a persistent initial transmission if a value of the new data indicator flag is equal to a first predefined value, and a retransmission of semi-persistent scheduling data if the value of the new data indicator flag is equal to a second predefined value.

Abstract: An approach is provided for utilizing implicit negative acknowledgement. A determination is made that a user equipment is out of synchronization (e.g., with respect to the uplink). A control signal specifying timing alignment information is generated for transmission to the user equipment. An implicit negative acknowledgement corresponding to retransmission of data is declared if an acknowledgement is not received within a predetermined time interval.