TECHNICAL FIELD

The present invention relates to a user terminal, a radio base station and a radio communication method in a next-generation communication system.

BACKGROUND ART

In a UMTS (Universal Mobile Telecommunications System) network, for the purposes of achieving higher-speed data rates, providing low delay and so on, long-term evolution (LTE) has been standardized (see Non Patent Literature 1). For the purposes of achieving further broadbandization and higher speed beyond LTE (also called LTE Rel. 8), LTE Advanced (also called Rel. 10, 11 or 12) has been standardized and successor systems to LTE (LTE Rel. 13 or later) have been also studied.

In LTE Rel. 10/11, in order to achieve broadbandization, there has been introduced carrier aggregation (CA) in which a plurality of component carriers (CCs) are aggregated. Each CC corresponds one unit of the system band of LTE Rel. 8. In CA, a user terminal (UE: User Equipment) is configured with a plurality of CCs of the same radio base station (eNB: eNodeB).

On the other hand, there has been also introduced dual connectivity (DC) in which UE is configured with a plurality of cell groups (CGs) of different radio base stations. Each cell group consists of at least one cell (CC). Since a plurality of CCs of different radio base stations are aggregated in DC, DC is also called inter-eNB CA.

In these LTE Rel. 8 through 12, transmission time interval (TTI) applied to DL transmission and UL transmission between a radio base station and a user terminal is controlled to be set to 1 ms. The transmission time interval is also called transmit time interval and TTI in the LTE system (Rel. 8-12) is also called subframe length.

CITATION LIST

Non Patent Literature

Non-Patent Literature 1: 3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2”

SUMMARY OF INVENTION

Technical Problem

For example, in a future radio communication system (for example, 5G), there have been expected communication in a high frequency band in which broad band is easily available (for example, several tens GHz band) and communication of relatively small traffic used for IoT (Internet of Things), MTC (Machine Type Communication), M2M (Machine To Machine) and so on. Furthermore, there are also increasing demands for V2V (Vehicular To Vehicular) communication and D2D (Device To Device) requiring low delay communication.

Further, 5G is target for a broad frequency as a carrier frequency (for example, 100 GHz) and a new radio access scheme (New RAT (Radio Access Technology)) suitable for high frequency bands has been considered to be designed. For example, in 5G RAT, introduction of a plurality of different numerologies has been considered. The numerology denotes a set of communication parameters featuring a signal design in RAT and RAT design.

However, if the radio communication system used in the existing radio communication system (for example, LTE Rel. 8-12) is to be applied as it is to New RAT, there may be a problem of deterioration of communication quality, which prevents appropriate communications. For example if, in a future radio communication system, information to notify a specific user terminal group in a future radio communication system is transmitted in the same manner as broadcast information of the existing system, there may be increase in overhead of the broadcast information and accordingly, reduction of throughputs.

The present invention was carried out in view of the foregoing and aims to provide a user terminal, a radio base station and a radio communication method capable of realizing appropriate communications in a next-generation communication system.

Solution to Problem

The present invention provides a user terminal comprising: a reception section that receives broadcast information transmitted from a radio base station; and a control section that controls reception in a random access procedure, wherein the reception section receives given broadcast information in the random access procedure.

Advantageous Effects of Invention

According to the present invention, it is possible to realize appropriate communication in a next-generation communication system.

