An eNodeB (eNB), user equipment (UE) and method of providing a flexible Radio Access Technology (FRAT) are generally described. The information (resource allocation, partition information and numerology) of at least one of a plurality of RATs used by the eNB is provided to a UE. Each RAT has a flexible subcarrier spacing and symbol duration, which are integer multiples of a base subcarrier spacing and symbol duration, and is associated with at least one of different temporal and frequency resources. The symbol and/or frame structure of each RAT are independent. A Transmission Time Interval (TTI) boundary between the RATs is common, and the RATs comprise a common reference TTI duration. The information of the RATs is provided either via a different RAT than the RAT used by the UE for communication or via a dedicated carrier in the RAT used by the UE for communication.

A base station performs wireless communication with a terminal using a first frequency band which needs a license to use for wireless communication and a second frequency band which does not need the license to use for the wireless communication. The base station includes: a generator that generates a request signal for requesting data transmission of the terminal in the second frequency band and specifying a first transmission timing of the terminal; and a transmitter that transmits the request signal to the terminal, wherein the request signal includes information specifying a second transmission timing, which is a next transmission timing when the terminal does not perform data transmission at the first transmission timing and is specified by an offset from a reference timing.

A communications device transmits and receives data via a wireless access interface in a mobile communications network. First resource allocation messages are received by communications devices to allocate one or more of plural communications resource elements of a host frequency range of a host carrier. Second resource allocation messages are received by reduced capability devices to allocate one or more of a first section of the communications resources within the first frequency range for preferable allocation to the reduced capability devices of a first virtual carrier, the first resource allocation messages identifying one or more of the communications resource of the host carrier allocated to the communications devices with reference to a first reference frequency and the second resource allocation messages identifying one or more communications resources of the first virtual carrier allocated to the reduced capability devices with reference to a second reference frequency within the first virtual carrier.

A communication method in a wireless communication system comprises: configuring a plurality of carrier aggregation groups (CAGs) by a wireless device; and receiving, through a first cell, configuration information about a control cell in which transmission of an uplink (UL) control channel is allowed. The plurality of CAGs comprises at least one cell, and one of the plurality of CAGs comprises the first cell.

Provided are a method and an apparatus for transmitting or receiving a downlink reference signal. A cell-specific downlink reference signal (CRS) is transmitted in a partial frequency band of the entire downlink frequency band. Configuration information of the CRS transmitted in the partial frequency band is provided to user equipment. The CRS transmitted in the partial frequency band may be used in downlink channel measurement alone or together with a legacy CRS.

It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method comprises the steps of setting a standard sequence with a standard sequence length and a standard sequence number in a step, setting a threshold value in accordance with an RB number in a step, setting a sequence length corresponding to RB number in a step, judging whether ¦r/N−rb/Nb¦=Xth(m) is satisfied in a step, including a plurality of Zadoff-Chu sequences with a sequence number and a sequence length in a sequence group in a step if the judgment is positive, and allocating the sequence group to the same cell in a step.

The present invention is designed so that communication can be carried out adequately even when the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth. According to an example of the present invention, a user terminal, in which the bandwidth to use is limited to a partial reduced bandwidth in a system bandwidth, has an acquiring section that acquires EPDCCH (Enhanced PDCCH) configuration information based on information that is reported from a radio base station without using a PDCCH (Physical Downlink Control Channel), and a receiving section that detects a user terminal-specific search space (USS: UE-specific Search Space) of an EPDCCH based on the EPDCCH configuration information.

The present invention is designed so that cross-carrier scheduling is carried out adequately even when the number of component carriers that can be configured in a user terminal is expanded compared to that of existing systems. A user terminal can communicate by using six or more component carriers, and has a receiving section that receives downlink control information including a carrier indicator field (CIF); and a control section that controls a receiving process of a downlink shared channel and/or a transmission process of an uplink shared channel in a predetermined component carrier based on the CIF, and the receiving section receives downlink control information including the same CIF value from different component carriers; and the control section determines the predetermined component carrier, considering an offset that is configured to a CIF value of each component carrier that transmits downlink control information including the CIF.

One or more transmission parameters for data transmission may be determined for wireless communications. A wireless device may determine transmission parameters for data transmission based on configuration associated with control signaling. For example, the transmission parameters (e.g., transmission beam, transmission power, etc.) may be determined based on a selected spatial relation, among multiple spatial relations, corresponding to a control channel.

One or more transmission parameters for data transmission may be determined for wireless communications. A wireless device may determine transmission parameters for data transmission based on configuration associated with control signaling. For example, the transmission parameters (e.g., transmission beam, transmission power, etc.) may be determined based on a selected spatial relation, among multiple spatial relations, corresponding to a control channel.