The present invention provides a method and device for transmitting/receiving an uplink signal. When a user equipment of the present invention is configured by multiple cell groups and multiple pieces of uplink control information (UCI) to be transmitted by the user equipment in a subframe are generated, the user equipment separately transmits, to the multiple cell groups, the UCI one by one from the piece of UCI having the highest priority, and drops the pieces of UCI having lower priorities among the multiple pieces of UCI.

Provided in the present invention is a method, base station, and user equipment for configuring a serving cell group. The method includes: a base station transmitting serving cell group configuration information to a user equipment having carrier aggregation capability, where the serving cell group configuration information indicates a reference cell used for transmitting uplink control information of a serving cell. The present invention allows the base station to flexibly configure multiple PUCCH reference cells and to configure different PUCCH reference cells on the basis of different cell loads.

A channel state is adequately reported even if the number of component carriers configurable to a user terminal is expanded to six or more. The user terminal for communicating with a radio base station by use of six or more component carriers includes a measuring section configured to measure reception quality of a downlink channel of each of the component carriers, and a transmission section configured to periodically transmit information relating to the reception quality in accordance with timing specified from the radio base station. The transmission section transmits information relating to reception quality of a plurality of component carriers, at a same subframe, by use of PUSCH or a PUCCH format having a larger capacity as compared with a PUCCH format for existing systems in which a number of configured component carriers is five or less.

Provided are methods for repeatedly transceiving a common control message for a machine-type communication (MTC) terminal in a wireless access system supporting MTC, and apparatuses supporting the methods. A method for receiving a common control message for an MTC terminal in a wireless access system supporting MTC according to one embodiment of the present invention may comprise the steps of: receiving a channel status information reference signal (CSI-RS); and receiving a common control message from a subframe in which the CSI-RS is received. Here, the common control message can be configured so as to be repeatedly transmitted from a previously configured number of subframes comprising the subframe.

The present invention relates to the field of communications technologies, and in particular, to a CSI reporting method, a CSI receiving method, and an apparatus, to resolve a technical problem that PUCCH resource overheads are relatively large during CSI reporting. In embodiments of the present invention, at least two PUCCH resources are configured for each downlink carrier group. CSI that needs to be reported in one uplink subframe may be obtained, and a format of a corresponding PUCCH resource is determined according to the to-be-reported CSI. For example, the determined format is referred to as a first format. Then, all of the to-be-reported CSI is reported after being added to a first first-format PUCCH resource.

In wireless communication networks using carrier aggregation including a secondary component carrier in unlicensed spectrum, a user equipment (UE) may monitor a downlink radio link quality of secondary cells for an event indicating failure of a communication link in the unlicensed spectrum with a secondary cell. The UE detects one or more failure events based on the downlink radio link quality. When a designated set of failure events is detected, the UE declares a failure state on the secondary cell. In response to the failure state, the UE may adjust operations related to the secondary component carrier in the unlicensed spectrum in order to save power and resources.

A method is provided for receiving aperiodic channel state information (CSI). A base station (BS) transmits, to a user equipment (UE), an uplink downlink control information (DCI) format. The BS receives, from the UE, aperiodic CSI through a physical uplink shared channel (PUSCH) if the BS triggers an aperiodic CSI report using a CSI request field included in the uplink DCI format. The CSI request field is either a 1-bit field or a multi-bit field. When the UE is configured with only one cell, the 1-bit field is included in the uplink DCI. When the UE is configured with more than one channel state information-reference signal (CSI-RS), the multi-bit field is included in the uplink DCI.

Some demonstrative embodiments include devices, systems and/or methods to establish a connection to the Internet via a local gateway (L-GW) function for a LIPA or a SIPTO@LN. The establishment of the connection to the Internet may be performed, for example, by at least one of an E-RAB SETUP procedure, an INITIAL CONTEXT SETUP procedure, an INITIAL UE MESSAGE procedure or an UPLINK NAS TRANSPORT procedure.

Methods, systems, and devices for wireless communications are described. A set of uplink control channel resources that are configured for acknowledgment transmissions may be shared among user equipments (UEs) that are enabled to receive multicast communications. Each of the shared set of uplink control channel resources may be associated with set(s) of channel state information. UEs may measure a multicast channel to determine channel state information for the multicast channel. After failing to receive a multicast transmission, UEs may transmit an acknowledgment feedback message over one of the shared uplink control channel resources that is associated with the set of channel state information determined by the UE. A base station that receives the acknowledgment feedback message may transmit a multicast retransmission for the UEs using transmission parameters that are adapted for the set(s) of channel state information associated with the occupied uplink control channel resource.

A search space for a user equipment can be set over a plurality of subframes. The starting positions of the starting subframe of the search space and a control channel for the user equipment may be different. The start of the search space is limited to a set of specific subframes. The search space may occur cyclically. The cycle of the search space is prefixed, or may be set for the user equipment by means of system information or an upper layer signal.