WO2017073651A1

WO2017073651A1 - User terminal, wireless base station, and wireless communication method

Info

Publication number: WO2017073651A1
Application number: PCT/JP2016/081848
Authority: WO
Inventors: 浩樹原田; 一樹武田; 聡永田; ジンワン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2015-10-27
Filing date: 2016-10-27
Publication date: 2017-05-04

Abstract

The present invention makes it possible to perform appropriate communications in a cell (such as an unlicensed band) in which listening is applied prior to transmission. A user terminal according to an embodiment of the present invention is provided with: a reception unit which, in a License-Assisted Access Secondary Cell (LAA SCell), receives common control information via a downstream control channel; and a control unit which controls communication processing in the LAA SCell on the basis of the common control information.

Description

User terminal, radio base station, and radio communication method

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

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and lower delay (Non-Patent Document 1). Also, LTE-A (also referred to as LTE Advanced, LTE Rel. 10, 11 or 12) has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE. Successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel.13, etc.) are also being studied.

Rel. In LTE of 8-12, the specification has been performed on the assumption that exclusive operation is performed in a frequency band (also referred to as a licensed band) licensed by a telecommunications carrier (operator). As the license band, for example, 800 MHz, 1.7 GHz, 2 GHz, and the like are used.

In recent years, the spread of highly functional user terminals (UE: User Equipment) such as smartphones and tablets has rapidly increased user traffic. In order to absorb the increasing user traffic, it is required to add a further frequency band, but the spectrum of the license band is limited.

For this reason, Rel. 13 In LTE, it is considered to expand the frequency of the LTE system using an unlicensed spectrum band (also referred to as an unlicensed band) that can be used in addition to the license band. Non-patent document 2). As the unlicensed band, for example, the use of a 2.4 GHz band or a 5 GHz band that can use Wi-Fi (registered trademark) or Bluetooth (registered trademark) is being studied.

Specifically, Rel. In 13 LTE, it is considered to carry out carrier aggregation (CA) between a licensed band and an unlicensed band. Communication performed using the unlicensed band together with the license band is referred to as LAA (License-Assisted Access). In the future, license connectivity and unlicensed band dual connectivity (DC: Dual Connectivity) and unlicensed band stand-alone (SA) may also be considered for LAA.

The cell of the unlicensed band is assumed to have different communication characteristics from the cell of the license band, such as listening applied before transmission. Therefore, synchronization, channel state information (CSI) measurement, downlink shared channel (PDSCH) demodulation, and rate matching can be achieved simply by applying control information signaling in the license band cell to the unlicensed band cell. There is a risk that communication processing such as cannot be performed properly.

The present invention has been made in view of the above points, and a user terminal and a radio base station capable of appropriately performing communication processing in a cell to which listening is applied before transmission (for example, a cell in an unlicensed band) One of the objects is to provide a wireless communication method.

A user terminal according to an aspect of the present invention includes, in LAA SCell (License-Assisted Access Secondary Cell), a reception unit that receives common control information via a downlink control channel, and the LAA based on the common control information. And a control unit that controls communication processing in the SCell.

According to the present invention, communication processing can be appropriately performed in a cell (for example, an unlicensed band) to which listening is applied before transmission.

1A and 1B are diagrams showing an example of the configuration of LAA DRS. FIG. 2 is an explanatory diagram of CSI-RS / IM information according to the present embodiment. 3A to 3C are diagrams showing an example of identifying DRS subframes according to the present embodiment. 4A and 4B are explanatory diagrams of DRS information according to the present embodiment. 5A and 5B are explanatory diagrams of burst information according to the present embodiment. 6A and 6B are diagrams illustrating an example of the extended PCFICH according to the present embodiment. 7A and 7B are diagrams showing another example of the extended PCFICH according to the present embodiment. 8A and 8B are diagrams showing still another example of the extended PCFICH according to the present embodiment. 9A and 9B are diagrams illustrating an example of a partial TTI according to the present embodiment. 10A and 10B are diagrams illustrating an example of generation of common control information according to the present embodiment. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the radio base station which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the radio base station and user terminal which concern on this Embodiment. 17A and 17B are diagrams showing an example of a CSI-RS configuration according to the present embodiment.

In a system that operates LTE / LTE-A in an unlicensed band (for example, an LAA system), it is considered that an interference control function is required for coexistence with LTE, Wi-Fi, or other systems of other operators. . A system that operates LTE / LTE-A in an unlicensed band is generally referred to as LAA, LAA-LTE, LTE-U, U-, regardless of whether the operation mode is CA, DC, or SA. It may be called LTE or the like.

In general, a transmission point (for example, a radio base station (eNB), a user terminal (UE), or the like) that performs communication using a carrier of an unlicensed band (may be referred to as a carrier frequency or simply a frequency) When another entity (for example, another user terminal) communicating with the carrier of the band is detected, transmission using the carrier is prohibited.

For this reason, the transmission point performs listening (LBT) at a timing before a predetermined period before the transmission timing. Specifically, the transmission point that executes LBT searches the entire target carrier band (for example, one component carrier (CC)) at a timing before a predetermined period before the transmission timing, and other devices It is confirmed whether (for example, a radio base station, a user terminal, a Wi-Fi device, etc.) is communicating in the carrier band.

In this specification, listening means that a certain transmission point (for example, a radio base station, a user terminal, etc.) exceeds a predetermined level (for example, predetermined power) from another transmission point before transmitting a signal. An operation for detecting / measuring whether or not a signal is transmitted. The listening performed by the radio base station and / or the user terminal may be referred to as LBT, CCA, carrier sense, or the like.

When the transmission point can confirm that no other device is communicating, the transmission point performs transmission using the carrier. For example, when the reception power measured by the LBT (reception signal power during the LBT period) is equal to or less than a predetermined threshold, the transmission point determines that the channel is in an idle state (LBT _idle ) and performs transmission. In other words, “the channel is idle” means that the channel is not occupied by a specific system, and the channel is idle, the channel is clear, the channel is free, and the like.

On the other hand, when the transmission point detects that another device is in use even in a part of the target carrier band, the transmission point stops its transmission process. For example, if the transmission point detects that the received power of a signal from another device related to the band exceeds a predetermined threshold, the transmission point determines that the channel is busy (LBT _busy ) and transmits Do not do. In the case of LBT _busy , the channel can be used only after performing LBT again and confirming that it is in an idle state. Note that the channel idle / busy determination method using the LBT is not limited to this.

As the mechanism (scheme) of LBT, FBE (Frame Based Equipment) and LBE (Load Based Equipment) are being studied. The difference between the two is the frame configuration used for transmission and reception, the channel occupation time, and the like. In the FBE, the transmission / reception configuration related to the LBT has a fixed timing. In addition, in the LBE, the transmission / reception configuration related to the LBT is not fixed in the time axis direction, and the LBT is performed according to demand.

Specifically, the FBE has a fixed frame period, and if a channel is usable as a result of performing carrier sense in a predetermined frame (may be called LBT time (LBT duration), etc.) This is a mechanism that performs transmission, but waits without performing transmission until the carrier sense timing in the next frame if the channel cannot be used.

LBE, on the other hand, extends the carrier sense time if the channel is unusable as a result of carrier sense (initial CCA), and continuously performs carrier sense until the channel becomes usable. ) The mechanism to implement the procedure. In LBE, a random back-off is necessary for proper collision avoidance.

The carrier sense time (which may be referred to as a carrier sense period) is a time (for example, 1) for performing processing such as listening to determine whether or not a channel can be used in order to obtain one LBT result. Symbol length).

The transmission point can transmit a predetermined signal (for example, a channel reservation signal) according to the LBT result. Here, the LBT result refers to information (for example, LBT _idle , LBT _busy ) relating to the channel availability obtained by the LBT in the carrier in which the LBT is set.

In addition, when the transmission point starts transmission when the LBT result is in an idle state (LBT _idle ), the transmission point can perform transmission while omitting the LBT for a predetermined period (for example, 10-13 ms). Such transmission is also called burst transmission or burst.

As described above, in the LAA system, by introducing interference control within the same frequency based on the LBT mechanism at the transmission point, interference between LAA and Wi-Fi, interference between LAA systems, etc. can be avoided. be able to. Further, even when transmission points are controlled independently for each operator who operates the LAA system, interference can be reduced without grasping each control content by the LBT.

By the way, even in the LAA system, in order to perform setting or resetting of SCell (Secondary Cell) of the unlicensed band for the user terminal, the user terminal detects SCell existing in the vicinity by RRM (Radio Resource Management) measurement, and the reception quality After measuring, it is necessary to report to the network. The signal for RRM measurement in LAA is Rel. 12 based on the discovery signal (DS: Discovery Signal).

A signal for RRM measurement in LAA may be called a detection measurement signal, a discovery reference signal (DRS), a discovery signal (DS), LAA DRS, LAA DS, or the like. Further, the SCell of the unlicensed band may be called, for example, LAA SCell.

LAA DRS is Rel. 12 As with DS, synchronization signal (PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), cell-specific reference signal (CRS) and channel state measurement reference signal (CSI-RS: Channel) It is under consideration to include at least one of (State Information Reference Signal).

Also, the network (for example, a radio base station) can set a LATC DRS DMTC (Discovery Measurement Timing Configuration) for each frequency for the user terminal. The DMTC includes information related to a DRS transmission period (may be referred to as a DMTC periodicity), a DRS measurement timing offset, and the like.

DRS is transmitted in DMTC period (DMTC duration) every DMTC period. Here, Rel. 12, the DMTC period is fixed to 6 ms length. Also, the length of DRS transmitted in the DMTC period (which may be referred to as a DRS period (DS), DS period, DRS burst, DS burst, etc.) is 1 ms to 5 ms. In LAA DS, Rel. The same setting as 12 may be used, or a different setting may be used. For example, in consideration of the LBT time, the DRS period may be 1 ms or less, or 1 ms or more.

In the cell of the unlicensed band, the radio base station performs listening (LBT) before transmitting LAA DRS, and transmits LAA DRS in the case of LBT _idle . The user terminal grasps the timing and period of the DRS period by DMTC notified from the network, and performs detection and / or measurement of LAA DRS. In the DRS period, in addition to RRM measurement, it is considered to perform CSI measurement using DRS. For example, it is assumed that CSI measurement is performed using CRS or CSI-RS included in DRS other than the timing of CSI measurement of a predetermined period (for example, 5 ms, 10 ms).

FIG. 1 is a diagram showing an example of the configuration of LAA DRS. FIG. 1A shows a configuration example when CRS is transmitted through two antenna ports. In FIG. 1A, the LAA DRS includes CRS (port 0/1) of symbols # 0, # 4, # 7, and # 11, PSS of symbol # 6, and SSS of symbol # 5. The LAA DRS may be configured to include CSI-RSs of symbols # 9 and # 10. FIG. 1B shows a configuration example when CRS is transmitted through four antenna ports. In FIG. 1B, the LAA DRS includes CRS (port 2/3) of symbols # 1 and # 8 in addition to the configuration of FIG. 1A.

In FIGS. 1A and 1B, CRS port X represents CRS transmitted through antenna port X. Moreover, the structure of LAA DRS shown to FIG. 1A and 1B is only an example, and is not restricted to this. The LAA DRS may be configured to include at least one of a synchronization signal (PSS / SSS), CRS, and CSI-RS. Further, PSS / SSS, CRS, and CSI-RS allocation positions (for example, resource elements) may be the same as or different from existing systems (for example, Rel. 12). LAA DRS is a Rel. It may be composed of 12 DRS 12 symbols (for example, symbols # 0- # 11).

As described above, it is assumed that the cell in the unlicensed band has different communication characteristics from the cell in the license band, such as listening applied before transmission. Therefore, there is a possibility that communication processing such as synchronization, CSI measurement, PDSCH demodulation, and rate matching cannot be appropriately performed only by applying control information signaling in the license band cell to the unlicensed band cell.

Accordingly, the present inventors have conceived that appropriate communication processing can be performed in an unlicensed band cell by signaling control information in consideration of communication characteristics of an unlicensed band different from the license band cell. did.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, a carrier (cell) for which listening is set is described as an unlicensed band, but the present invention is not limited to this. This embodiment can be applied to any frequency carrier (cell) for which listening is set regardless of the license band or the unlicensed band.

Further, in the present embodiment, CA or carrier of a carrier for which listening is not set (for example, a license cell primary cell (PCell)) and a carrier for which listening is set (for example, an unlicensed band secondary cell (SCell)) Although the case where DC is applied is assumed, it is not restricted to this. For example, the present embodiment can be applied to a case where a user terminal is connected to a carrier (cell) for which listening is set in a stand-alone manner.

In the present embodiment, control information to be described later is signaled in the physical layer, but the present invention is not limited to this. At least one of the control information described later may be signaled by an upper layer (for example, RRC (Radio Resource Control) or system information).

(Signaling content)
In the present embodiment, control information signaled in a cell of an unlicensed band (a cell in which listening is set before transmission) will be described. The common control information signaled commonly to the user terminals in the cell may include at least one of the following CRS information, CSI-RS / IM information, DRS information, and burst information. Moreover, the specific control information (UE specific control information) individually signaled to the user terminal of the cell may include at least one of the following final subframe information and DRS information.

(1) CRS information The CRS information is information related to the number of OFDM (Orthogonal Frequency-Division Multiplexing) symbols to which CRS is allocated in a subframe. For example, the CRS information may be a bit value (for example, 1 bit) indicating whether the CRS is assigned to 1 or 2 OFDM symbols in the subframe (or whether to be assigned to 4 or 6 OFDM symbols). Good.

In general, within one subframe, a CRS is assigned to 4 OFDM symbols (eg, OFDM symbols # 0, # 4, # 7, # 11 in FIG. 1A) for 2 antenna ports and OFDM for 4 antenna ports. Assigned to symbols (for example, OFDM symbols # 0, # 1, # 4, # 7, # 8, # 11 in FIG. 1B).

In contrast, a CRS is assigned to one OFDM symbol (for example, only the first OFDM symbol) in the case of two antenna ports, and is assigned to two OFDM symbols (for example, only the first and second OFDM symbols) in the case of four antenna ports. The introduction of subframes is also being considered. By introducing the subframe, the overhead of CRS can be reduced in a transmission mode in which demodulation is performed using a demodulation reference signal (DMRS: DeModulation Reference Signal).

By the way, in the cell of the unlicensed band, since the radio base station does not perform downlink transmission when the listening result is busy, the user terminal needs to determine whether downlink transmission is performed in each subframe. For this reason, when the user terminal detects the CRS (CRS ports 0 and 1) of the cell ID of the cell of the unlicensed band in the first OFDM symbol of the subframe, the user terminal performs downlink transmission (for example, PSS, SSS) in the subframe. , At least one transmission of CSI-RS and PDSCH) is performed.

However, based on the detection result of CRS in the first OFDM symbol of the subframe, whether the subframe is a subframe in which CRS is assigned to 1 or 2 OFDM symbols, or a subframe in which CRS is assigned to 4 or 6 OFDM symbols. It is assumed that cannot be determined. As a result, there is a possibility that synchronization, CSI measurement based on CRS, or rate matching of PDSCH cannot be performed appropriately.

Therefore, in the present embodiment, CRS information indicating whether or not CRS is assigned to 1 or 2 OFDM symbols in a subframe (or whether or not 4 or 6 OFDM symbols are assigned) may be signaled.

Since CRS information is assumed to be used for synchronization, CSI measurement, and rate matching, it may be commonly signaled to user terminals in the cell.

(2) CSI-RS / IM information CSI-RS / IM information is allocated to non-zero power CSI-RS (CSI-RS) and / or zero power CSI-RS (CSI-IM (Interference Measurement)) in a subframe. It is information about. For example, the CSI-RS information is a bit value (for example, 1 bit) indicating the presence / absence of non-zero power CSI-RS and / or zero power CSI-RS (hereinafter abbreviated as CSI-RS / IM) in a subframe. There may be.

In the existing system (for example, Rel. 12), the CSI-RS / IM used for CSI measurement is assigned to a subframe of a predetermined period (for example, a period of 5 or 10 ms) set by higher layer signaling. In an unlicensed band cell, in addition to subframes of a predetermined period, it is also considered to assign CSI-RS / IM for CSI measurement to subframes to which DRS is assigned (hereinafter abbreviated as DRS subframes). Yes. Therefore, as shown in FIG. 2, when the CSI-RS / IM allocation subframes # 2 and # 7 in a predetermined cycle do not match the DRS subframe # 1 in the DMTC, the user terminal It is desirable to be able to determine whether to perform CSI measurement in a subframe.

Therefore, in the present embodiment, CSI-RS / IM information indicating whether or not CSI-RS / IM for CSI measurement is allocated in a subframe may be signaled. Accordingly, as shown in FIG. 2, when the CSI-RS / IM information signaled in the DRS subframe # 1 indicates the assignment of CSI-RS / IM, the user terminal performs CSI measurement in the DRS subframe # 1. It can be judged to do.

Since the CSI-RS / IM information is assumed to be used for both a user terminal scheduled for PDSCH and a user terminal not scheduled for PDSCH, it may be commonly signaled to user terminals in a cell.

(3) DRS information The DRS information is information related to DRS allocation within a subframe. For example, the DRS information may be a bit value (for example, 1 bit) indicating the presence or absence of DRS in the subframe.

As described above, in an unlicensed band cell, even if a subframe of a predetermined period (for example, a period of 5 or 10 ms) set in higher layer signaling and a DRS subframe do not match, the DRS subframe is used for CSI measurement. CSI-RS / IM can be assigned. In this case, if the user terminal is a DRS subframe, it can be determined that the user terminal is a subframe in which CSI measurement is performed. However, it is assumed that the user terminal cannot identify the DRS subframe in DMTC.

A DRS subframe identification example will be described with reference to FIGS. FIG. 3A shows a case in which only DRS is transmitted in any subframe in DMTC (for example, subframe # 1 or # 5 in FIG. 3A). FIG. 3B shows a case where DRS and PDSCH are transmitted in subframe # 0 in DMTC. FIG. 3C shows a case where DRS and PDSCH are transmitted in subframe # 8 other than subframes # 0 and # 5 in DMTC. In the case shown in FIGS. 3A to 3C, since the subframe including the PSS, SSS, and CRS is only one subframe in the DMTC, the subframe can be identified as the DRS subframe.

On the other hand, as shown in FIGS. 4A and 4B, when a DRS subframe and normal subframes # 0 and / or # 5 to which PSS, SSS, and CRS are allocated are mixed in the DMTC, the user terminal There is a possibility that 0 or / and # 5 cannot be distinguished from the DRS subframe.

For example, in FIG. 4A, DRS is assigned in subframe # 1 in DMTC, and existing PSS, SSS, and CRS are assigned in subframe # 5. Here, the DRS includes a PSS, an SSS, and a CRS as shown in FIGS. 1A and 1B. Therefore, it is assumed that the user terminal cannot distinguish between the subframe # 1 that is a DRS subframe and the subframe # 5 that is not a DRS subframe but includes PSS, SSS, and CRS in DMTC. Similarly, in FIG. 4B, it is assumed that subframe # 0 that is a DRS subframe and subframe # 5 that is not a DRS subframe but includes PSS, SSS, and CRS cannot be distinguished in DMTC.

Therefore, in the present embodiment, DRS information indicating whether or not a DRS is allocated within a subframe may be signaled. When the DRS information indicating that the DRS is allocated is included in the subframe, the user terminal can determine that the subframe is a DRS subframe and perform CSI measurement in the DRS subframe. Moreover, since the user terminal can detect whether DRS is assigned to the subframe to which the PDSCH is assigned based on the DRS information, the user terminal can appropriately perform rate matching.

Since DRS information is assumed to be used instead of the above-mentioned CSI-RS / IM information, it may be signaled in common to user terminals in the cell. When CSI-RS for RRM measurement and / or CSI measurement is set for the user terminal, the user terminal first detects a subframe including PSS, SSS, and CRS detected in DMTC (for example, If it is assumed that subframe # 1 in FIG. 4A and subframe # 0 in FIG. 4B are DRS subframes including CRM-RSs for RRM measurement and / or CSI measurement, the DRS information may not be commonly signaled. Good.

Also, since it is assumed that the DRS information is used for rate matching of PDSCH, UE-specific signaling may be performed to the user terminal scheduled for PDSCH.

(4) Burst information Burst information is information regarding the burst to which the subframe belongs. Specifically, the burst information may be information indicating whether or not a subframe belongs to the same burst as other subframes. For example, the burst information may be a bit value indicating the number of subframes in which the same burst continues from the current subframe (for example, 4 bits if the maximum burst length is 10 or 13 ms), or a burst index. May be a bit value (for example, 1 or 2 bits).

In an unlicensed band cell, the user terminal can assume that the transmission power of CRS and / or CSI-RS is constant between subframes in the same burst, so the result of CSI measurement based on CRS or CSI-RS May be averaged. On the other hand, the user terminal should not assume that the transmission power of CRS and / or CSI-RS is constant between subframes in different bursts (assuming that it varies), so it is based on CRS or CSI-RS. The results of CSI measurements should not be averaged.

Therefore, in this embodiment, signaling the above burst information prevents the CSI measurement results from being averaged between subframes in different bursts. The burst information will be described in detail with reference to FIGS. 5A and 5B. In FIG. 5A, burst information indicating the number of subframes in which the same burst continues from the current subframe is used. In FIG. 5B, burst information indicating a burst index is used.

In FIG. 5A, in subframe # 1 constituting the first burst from the left, burst information indicating the number of subframes “0” followed by the same burst is signaled. Further, in subframes # 3, # 4, # 5, and # 6 constituting the next burst, bursts indicating the number of subframes “3”, “2”, “1”, and “0”, respectively, in which the same burst continues. Information is signaled. In FIG. 5A, since the user terminal can recognize the subframe in which the burst ends based on the burst information, it is possible to prevent the CSI measurement result from being averaged between the burst and the subframe of the next burst.

In FIG. 5B, burst information indicating the burst index # 0 is signaled in each of the subframes # 0 to # 3 constituting the first burst from the left. In subframes # 7 to # 0 constituting the second burst, burst information indicating burst index # 1 is signaled. Burst information indicating burst index # 2 in subframe # 1 constituting the third burst, burst information indicating burst index # 3 in subframe # 3- # 6 constituting the fourth burst, and fifth burst Burst information indicating burst index # 0 is signaled in subframes # 7 to # 0 constituting the frame.

Thus, in FIG. 5B, burst information indicating a burst index is signaled in the subframes constituting each burst. Since the user terminal can identify whether or not the subframes belong to the same burst based on the burst index, it is possible to prevent the CSI measurement results from being averaged between subframes of different bursts.

In FIG. 5B, since a 2-bit burst index is used, there is a time interval of 13 ms between bursts assigned the same burst index # 0 (that is, between the first and fifth bursts from the left). . Assuming that the maximum burst length is 10 or 13 ms, the user terminal is less likely to misidentify that the subframes in the first and fifth bursts belong to the same burst. In this way, by increasing the number of bits of the burst index, it is possible to prevent erroneous recognition between bursts with the same burst index. From the viewpoint of reducing overhead, a 1-bit burst index may be used.

Since burst information is assumed to be used for CSI measurement, it may be commonly signaled to user terminals in a cell.

(5) Final subframe information The final subframe information is information related to the final subframe of the burst. For example, the final subframe information may be a bit value indicating the number of OFDM symbols used in the final subframe of the burst (for example, 3 bits when indicating eight types of configurations of the final subframe).

In an unlicensed band cell, PDSCH (transport block) may be mapped to all OFDM symbols or a part of OFDM symbols in the last subframe of a burst. For example, a configuration of DwPTS (Downlink Pilot Time Slot) (such as 6 or 10 OFDM symbols) can be used as some of the OFDM symbols. As described above, when the number of OFDM symbols in the last subframe of the burst can be dynamically changed, the user terminal needs to recognize the number of OFDM symbols in order to demodulate the PDSCH.

Therefore, in the present embodiment, final subframe information indicating the number of OFDM symbols used in the final subframe of the burst may be signaled. The user terminal demodulates the PDSCH mapped to the final subframe based on the number of OFDM symbols indicated by the final subframe information.

Since the final subframe information is assumed to be used for demodulation of PDSCH, it may be individually signaled to a user terminal scheduled for PDSCH.

Further, in the present embodiment, the final subframe information may be commonly signaled to the user terminals in the cell.

When the user terminal detects CRS (CRS ports 0 and 1) or / and PDCCH (Physical Downlink Control Channel) of the cell ID of the cell of the unlicensed band in the first OFDM symbol of the subframe, the user terminal downloads in the subframe. It can be determined that transmission is performed. On the other hand, when the last subframe of a burst is composed of a part of OFDM symbols, there is a possibility that the signal structure is different from that of a normal subframe including all OFDM symbols. For example, when the last subframe is composed of a part of OFDM symbols, it is also assumed that at least one of PSS, SSS, and CSI-RS / IM is not allocated in the last subframe. For this reason, if the user terminal cannot recognize the signal configuration in the final subframe, it may not be able to appropriately perform RRM measurement, CSI measurement, and PDSCH rate matching.

Therefore, in the present embodiment, the final subframe information may be commonly signaled to the user terminals in the cell. The user terminal recognizes the signal configuration of the final subframe of the burst based on the above-described final subframe information, and performs RRM measurement, CSI measurement, and PDSCH rate matching in the final subframe of the burst based on the recognition result. Do at least one.

Specifically, based on the number of OFDM symbols indicated by the last subframe information, the user terminal may recognize whether or not PSS / SSS is normally allocated in subframes # 0 and # 5 to which PSS / SSS is allocated. .

For example, when the number of OFDM symbols indicated by the last subframe information is less than a predetermined number in subframe # 0 or # 5, the user terminal assumes that PSS / SSS is not included in the subframe # 0 or # 5. May be. Here, for example, in the case of a normal CP (Cyclic Prefix), the predetermined number may be 14, or may be 7.

Further, the user terminal recognizes whether or not CSI-RS / IM is allocated in a subframe having a predetermined period (for example, a period of 5 or 10 ms) set by higher layer signaling based on the number of OFDM symbols indicated by the last subframe information. May be.

For example, when the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined period is less than the predetermined number, the user terminal may assume that CSI-RS / IM is not included in the subframe. Here, for example, in the case of a normal CP (Cyclic Prefix), the predetermined number may be 14, 11, or 7.

In addition, based on the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined period and the CSI-RS configuration notified by higher layer signaling, the user terminal can perform CSI-RS / IM in the subframe. The presence or absence of assignment may be recognized. Here, the CSI-RS configuration is information indicating an allocation position of CSI-RS / IM, and is notified to the user terminal 20 by higher layer signaling.

FIG. 17 is a diagram illustrating an example of a CSI-RS configuration. In the case of CSI-RS with two antenna ports, as shown in FIG. 17A, CSI-RS / IM allocation positions are specified by CSI-RS configurations # 0 to # 19. In the case of CSI-RS with 4 antenna ports, as shown in FIG. 17B, CSI-RS / IM allocation positions are specified by CSI-RS configurations # 0 to # 9.

When the number of OFDM symbols indicated by the last subframe information is 11 or more and less than 14 in the subframe having the predetermined period, the user terminal assigns CSI-RS / IM allocation positions to OFDM symbols # 12 and # 13 (CSI in FIG. 17A). -When any one of RS configurations # 4, # 9, # 18, and # 19 is set (when CSI-RS configuration # 4 or # 9 is set in FIG. 17B), CSI-RS / It may be assumed that no IM is included.

Conversely, even when the number of OFDM symbols indicated by the last subframe information in the subframe of the predetermined period is 11 or more and less than 14, the user terminal has a position where CSI-RS / IM is allocated as OFDM symbol # 5 and In the case of # 6 or OFDM symbols # 9 and # 10 (when any of CSI-RS configurations # 0- # 3, # 5- # 8, # 10- # 17 is set in FIG. 17A, CSI-RS configurations # 0 to # 3 and # 5 to # 8 are set), it can be assumed that CSI-RS / IM is included in the subframe.

In addition, when the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined period is 7 or more and less than 11, the user terminal sets the allocation position of CSI-RS / IM to OFDM symbols # 9 and # 10 or OFDM symbols. In the case of # 12 and # 13 (when any of CSI-RS configuration # 1- # 4, # 6- # 9, # 12- # 19 in FIG. 17A is set, CSI-RS configuration # in FIG. 17B) 1- # 4 and # 6- # 9 are set), it may be assumed that CSI-RS / IM is not included in the subframe.

Conversely, even when the number of OFDM symbols indicated by the last subframe information in the subframe of the predetermined period is 7 or more and less than 11, the user terminal has the allocation position of CSI-RS / IM as OFDM symbol # 5 and When # 6 (when CSI-RS configuration # 0, # 5, # 10, or # 11 is set in FIG. 17A, when CSI-RS configuration # 0 or # 5 is set in FIG. 17B) ) Can be assumed to include CSI-RS / IM in the subframe.

In addition, when the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined period is less than a predetermined number (for example, 14 in the case of normal CP), the user terminal performs a normal CSI-RS / IM allocation pattern ( An assignment pattern different from that shown in FIG. 17 may be assumed. The different allocation patterns may be configured by, for example, OFDM symbols # 0 to # 6 in FIG.

(6) Others In this embodiment, in order to reduce the power consumption of the user terminal, information on subframes for which monitoring of downlink control information and / or CSI measurement is not performed (for example, monitoring and / or monitoring from the last subframe of a burst) Alternatively, the number of subframes for which CSI measurement is not performed may be signaled. Information on the subframe may be commonly signaled to user terminals in the cell, or may be individually signaled to user terminals in the cell.

Also, as described above, since the transmission power of CRS and / or CSI-RS varies between bursts, information on the transmission power of CRS and / or CSI-RS may be signaled. Information regarding the transmission power may be commonly signaled to user terminals in the cell, or may be individually signaled to user terminals in the cell.

(Common signaling)
Next, a common control information signaling (common signaling) method according to the present embodiment will be described. In this embodiment, an example in which physical control channels other than the downlink control channel (PDCCH or EPDCCH) are extended to signal common control information (first mode), the downlink control channel of the cell (SCell) of the unlicensed band An example in which common control information is signaled in the provided common search space (second mode) and an example in which common control information is signaled in the common search space of the downlink control channel of the PCell (third mode) will be described.

Here, the common control information is assumed to include at least one of CRS information, CSI-RS / IM information, DRS information, and burst information, but other information (for example, monitoring of downlink control information and / or Information on subframes for which CSI measurement is not performed, information on transmission power of CRS and / or CSI-RS, and the like may be included.

Further, the common control information may include final subframe information.

In the following, a case where the common control information includes CRS information, CSI-RS / IM information, and burst information is illustrated, but the combination of information is not limited to this. For example, the common control information may include DRS information instead of CSI-RS / IM information, or may not include both CSI-RS / IM information and DRS information.

<First aspect>
In the first mode, in an unlicensed band cell, the physical control channel other than the downlink control channel (PDCCH or EPDCCH) is extended to signal common control information. Below, the example which expands a control format notification channel (PCFICH: Physical Control Format Indicator CHannel) is demonstrated.

Here, the PCFICH is a physical control channel that transmits a control format identifier (CFI) indicating the number of OFDM symbols allocated to the PDCCH in the subframe. PCFICH is arranged in the first OFDM symbol of a subframe and is referred to by all user terminals in the cell. For this reason, when extending PCFICH, common signaling can be performed without providing a common search space in the downlink control channel.

Hereinafter, in order to distinguish from existing PCFICH that transmits only CFI, PCFICH that transmits other common control information in addition to CFI is referred to as enhanced PCFICH (Enhanced PCFICH), but the name is not limited thereto. The extended PCFICH may be called ePCFICH, a common control channel, or the like.

The configuration of the extended PCFICH will be described with reference to Fig. 6-8. FIG. 6A shows an existing PCFICH configuration. As shown in FIG. 6A, in the existing PCFICH, a 2-bit CFI is encoded at an encoding rate of 1/16, and a 32-bit encoded bit string is modulated by QPSK (Quadrature Phase Shift Keying). Sixteen symbols are mapped to four resource element groups (REGs) distributed in the frequency direction on the basis of physical cell IDs (PCIs) every four symbols. One REG is composed of four resource elements (RE). 4REG is assigned to the first OFDM symbol in the subframe.

On the other hand, in the extended PCFICH, in addition to the 2-bit CFI, common control information having a predetermined number of bits is transmitted. For example, when transmitting CRS information (1 bit), CSI-RS / IM information (1 bit), and burst information (2 or 4 bits) in addition to CFI (2 bits), a total of 6 or 8 bits is common. Control information is transmitted. For this reason, in the extended PCFICH, more bit information can be transmitted by changing at least one of encoding, padding, modulation, and mapping of the existing PCFICH.

For example, FIG. 6B shows a configuration example in which the coding rate is made lower than that of PCFICH and the number of mapped REs and the modulation scheme are maintained. In FIG. 6B, a total of 6 bits of common control information (CFI (2 bits) + CRS information (1 bit) + CSI-RS / IM information (1 bit) + burst information (2 bits)) is encoded at a coding rate of 1/5. And 2 bits are padded. Also, a total of 8 bits of common control information (CFI (2 bits) + CRS information (1 bit) + CSI-RS / IM information (1 bit) + burst information (4 bits)) is encoded at a coding rate of 1/4. The The 32-bit coded bit string is modulated by QPSK and mapped to 16REG of 4REG, similar to the existing PCFICH.

7A and 7B show a configuration example in which the number of REs mapped in comparison with PCFICH is increased and the coding rate and the modulation scheme are maintained. 7A and 7B, 6 or 8 bits of common control information is encoded at a coding rate of 1/16, and a 96 or 128 bit encoded bit string is modulated by QPSK.

As shown in FIG. 7A, the modulated 48 or 64 symbols may be mapped to 12 or 16 REGs. In this case, 1REG is comprised by 4RE similar to the existing PCFICH. Alternatively, as shown in FIG. 7B, the modulated 48 or 64 symbols may be mapped to 4REG. In this case, unlike the existing PCFICH, 1REG is composed of 12 or 16REs. In this way, when the number of REGs is increased from the existing PCFICH by the extended PCFICH, the number of REGs may be increased by maintaining the number of REGs in the REG, or the number of REs in the REG may be increased by maintaining the number of REGs. You may let them.

8A shows a configuration example in which the modulation rate is maintained by lowering the coding rate than PCFICH and increasing the number of mapped REs. In FIG. 8A, 6-bit common control information is encoded at a coding rate of 1/10, and 4 bits are padded. In addition, 8-bit common control information is encoded at an encoding rate of 1/8. The 64-bit encoded bit string is modulated by QPSK and mapped to 32RE. Although FIG. 8A shows an example in which 1 REG is composed of 4 REs and is mapped to 8 REGs, the present invention is not limited to this. The number of REs constituting one REG may be increased to 8 REs and mapped to the same 4 REGs as the existing PCFICH.

FIG. 8B shows a configuration example in which the modulation scheme is increased and the number of mapped REs is increased to maintain the coding rate. In FIG. 8B, 6 or 8-bit common control information is encoded at an encoding rate of 1/16. The encoded bit string of 96 or 128 bits is modulated by 16QAM (Quadrature Amplitude Modulation) and mapped to 24 or 32RE. 8B shows an example in which 1 REG is composed of 4 REs and mapped to 6 or 8 REGs, but is not limited thereto. The number of REs constituting one REG may be increased to 6 or 8 REs, and may be mapped to the same 4 REGs as the existing PCFICH.

According to the first aspect described above, common control information common to user terminals in a cell can be transmitted without providing a common search space in a downlink control channel in an unlicensed band cell. Further, the number of REs to which the extended PCFICH is mapped is not greatly changed compared with the existing PCFICH (for example, in FIG. 6B, 16 REs that are the same as the existing PCFICH). For this reason, the overhead caused by signaling the additional common control information does not occur or can be minimized.

Note that the RE to which the extended PCFICH is mapped in FIG. 6-8 may be the first OFDM symbol of the subframe or may be an OFDM symbol other than the first. Whether the user terminal refers to the existing PCFICH or the extended PCFICH may be instructed by higher layer signaling, or may be set in the user terminal in advance.

Also, in an unlicensed band cell, the PDCCH may be assigned to the first or second OFDM symbol at the beginning of the subframe, and may not be assigned to the third OFDM symbol. In this case, the number of CFI bits can be reduced from 2 bits to 1 bit.

Also, in a TTI (partial starting TTI) (hereinafter referred to as a partial TTI) starting from the middle of a subframe, common control information in an unlicensed band cell may not be transmitted. In the partial TTI, it is assumed that the existing PCFICH and PDCCH are allocated in the first OFDM symbol of the second slot of the subframe. This is because, in the partial TTI, the user terminal can assume that no CRS is assigned to 4 or 6 OFDM symbols, no CSI-RS / IM is assigned, and a new burst is started.

For example, as shown in FIGS. 9A and 9B, in a subframe other than the partial TTI, the extended PCFICH may be assigned to the first OFDM symbol of the subframe. On the other hand, as shown in FIG. 9B, in the partial TTI, the common control information for the cell of the unlicensed band may not be transmitted, so that the existing PCFICH may be assigned to the OFDM symbol where the partial TTI starts. .

<Second aspect>
In the second mode, common control information is signaled in a common search space provided in a downlink control channel (PDCCH or EPDCCH) of an unlicensed band cell (SCell).

Specifically, in the second mode, a new wireless network temporary identifier (RNTI) is introduced for an unlicensed band cell or SI (System Information) -RNTI not used in the SCell is used. Used.

FIG. 10 is a diagram illustrating a generation example of common control information according to the second mode. The radio base station includes a cyclic redundancy check (CRC) scrambled (masked) by RNTI (see FIG. 10A) or SI-RNTI (see FIG. 10B) for an unlicensed band cell including common control information in the existing DCI format. ) Is added. The radio base station assigns and transmits the common control information with the CRC added to the common search space of the downlink control channel of the cell of the unlicensed band.

The user terminal performs blind decoding of the common search space of the downlink control channel of the primary cell, and when the DCI can be normally decoded by the CRC descrambled by the RNTI or SI-RNTI for the cell of the unlicensed band, the CRC is added. The DCI in the existing format is replaced with the above-described common control information. Note that the RNTI or SI-RNTI for an unlicensed band cell may be notified to the user terminal in advance by higher layer signaling (for example, RRC signaling or system information).

Further, as the existing DCI format shown in FIGS. 10A and 10B, for example, the DCI format 1C can be considered. Since the DCI format 1C has a bandwidth of 20 MHz and is 15 bits, it can include the above-described CRS information (1 bit), CSI-RS / IM information (1 bit), and burst information (2 or 4 bits). is there.

According to the above second aspect, since CRC is added to the common control information, it is possible to prevent erroneous detection of the common control information in the user terminal. Also, for example, the total number of bits including CRS information (1 bit), CSI-RS / IM information (1 bit), and burst information (2 or 4 bits) is 4 or 6 bits, so that the existing DCI format 1C There is room for 15 bits. For this reason, the expandability of common control information can be improved compared with a 1st aspect.

In addition, when the common control information is allocated to the common search space of the EPDCCH in the unlicensed band, information regarding the presence or absence of the common search space in the EPDCCH may be notified to the user terminal by higher layer signaling. In this case, the user terminal may specify the resource to which the common search space is allocated based on the PCI and the subframe index.

Alternatively, when the common control information is allocated to the EPDCCH common search space of the unlicensed band, the resource information indicating the resource to which the common search space in the EPDCCH is allocated may be notified to the user terminal by higher layer signaling.

<Third Aspect>
In the third mode, common control information is signaled in a common search space provided in a downlink control channel (PDCCH or EPDCCH) of a primary cell (PCell) that is carrier-aggregated or dual-connected with an unlicensed band cell (SCell). Specifically, in the third aspect, a new wireless network temporary identifier (RNTI) is introduced for an unlicensed band cell. Since SI-RNTI is used in the PCell of the existing system, it is not desirable to use SI-RNTI in the third mode.

As described with reference to FIG. 10A, the radio base station adds common control information to the existing DCI format and adds a CRC scrambled (masked) by an RNTI for an unlicensed band cell. The radio base station allocates (cross-carrier schedules) the common control information with the CRC added to the common search space of the downlink control channel of the primary cell and transmits it.

The user terminal performs blind decoding on the common search space of the downlink control channel of the primary cell, and when the DCI can be normally decoded by the CRC descrambled by the RNTI for the cell of the unlicensed band, the user terminal of the existing format to which the CRC is added DCI is replaced with the above-described common control information. Note that the RNTI for an unlicensed band cell may be notified to the user terminal in advance by higher layer signaling (for example, RRC signaling or system information).

According to the above third aspect, common control information can be transmitted to user terminals in the cell without providing a common search space in the downlink control channel in the cell of the unlicensed band as in the second aspect. . Moreover, since CRC is added to the common control information, erroneous detection of the common control information in the user terminal can be prevented.

When performing cross-carrier scheduling as in the third aspect, it is assumed that the existing DCI format includes an index for identifying the SCell (for example, 5 bits in the case of 32CC) in the existing format. Even if the SCell index (5 bits) is added to the total number of bits of 4 or 6 described above, the existing DCI format 1C has 15 bits. Therefore, the expandability of the common control information can be improved as compared with the first mode.

Further, when the common control information is allocated to the common search space of the EPDCCH of the primary cell, as described in the second aspect, information regarding the presence or absence of the common search space in the EPDCCH, or resource information to which the common search space is allocated May be notified to the user terminal by higher layer signaling.

(UE specific signaling)
Next, a technique of unique control information signaling (UE specific signaling) in the present embodiment will be described. In the present embodiment, the unique control information is signaled in a user-specific search space provided in the downlink control channel of a cell (SCell) of an unlicensed band, or downlink control of a PCell that performs CA or DC with the cell. Signaled in the channel's user-specific search space.

Here, it is assumed that the specific control information includes at least one of final subframe information and DRS information, but other information (for example, a subframe for which monitoring of downlink control information and / or CSI measurement is not performed) Information, information on CRS and / or CSI-RS transmission power, etc.).

For example, when signaling specific control information including the above-mentioned final subframe information (3 bits) and DRS information (1 bit), an additional 4 bits are required. For this reason, a new DCI format with an increased number of bits may be introduced.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the present embodiment will be described. In this wireless communication system, the above-described common signaling and / or UE-specific signaling is applied.

FIG. 11 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit can be applied. The wireless communication system 1 also has a wireless base station (for example, LTE-U base station) that can use an unlicensed band.

The wireless communication system 1 includes SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), etc. May be called.

A radio communication system 1 shown in FIG. 11 includes a radio base station 11 that forms a macro cell C1, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. I have. Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2. For example, a mode in which the macro cell C1 is used in the license band and the small cell C2 is used in the unlicensed band (LTE-U) is conceivable. Further, a mode in which a part of the small cell is used in the license band and another small cell is used in the unlicensed band is conceivable.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. For example, assist information (for example, DL signal configuration) regarding the radio base station 12 (for example, LTE-U base station) that uses the unlicensed band is transmitted from the radio base station 11 that uses the license band to the user terminal 20. can do. Further, when CA is performed in the license band and the unlicensed band, it is possible to adopt a configuration in which one radio base station (for example, the radio base station 11) controls the schedules of the license band cell and the unlicensed band cell.

Note that the user terminal 20 may be connected to the radio base station 12 without being connected to the radio base station 11. For example, the wireless base station 12 using the unlicensed band may be connected to the user terminal 20 in a stand-alone manner. In this case, the radio base station 12 controls the schedule of the unlicensed band cell.

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier). On the other hand, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or The same carrier may be used. The configuration of the frequency band used by each radio base station is not limited to this.

Between the wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12), a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection It can be set as the structure to do.

The radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point. Hereinafter, when the

radio base stations

11 and 12 are not distinguished, they are collectively referred to as a radio base station 10. Moreover, it is preferable that the radio base stations 10 that share and use the same unlicensed band are configured to be synchronized in time.

Each user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.

In the radio communication system 1, as a radio access method, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink. Carrier Frequency Division Multiple Access) is applied. OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there. The uplink and downlink radio access methods are not limited to these combinations.

In the wireless communication system 1, downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. The PDSCH may be referred to as a downlink data channel. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.

Downlink L1 / L2 control channels are PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), Enhanced PCFICH (Enhanced Physical Control Format Indicator Channel) PHICH (Physical Hybrid-RQ Indicator Channel). Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The PCFICH transmits a CFI (Control Format Indicator) which is the number of OFDM symbols used for the PDCCH. The HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH. The EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH. The extended PCFICH is used for transmission of common control information for cells in an unlicensed band in addition to CFI.

In the radio communication system 1, as an uplink channel, an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink L1 / L2 control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. PUSCH may be referred to as an uplink data channel. User data and higher layer control information are transmitted by PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information (ACK / NACK), and the like are transmitted by PUCCH. A random access preamble for establishing connection with a cell is transmitted by the PRACH.

In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS: DeModulation Reference Signal), detection measurement reference signal (DRS: Discovery Reference Signal), etc. are transmitted. In the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.

<Wireless base station>
FIG. 12 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

In the baseband signal processing unit 104, with respect to user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) Control) Retransmission control (for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, and other transmission processing Is transferred to the transmission / reception unit 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.

The transmission / reception unit 103 can transmit / receive uplink (UL) / downlink (DL) signals in an unlicensed band. The transmission / reception unit 103 may be capable of transmitting / receiving UL / DL signals in a license band. The transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device which is described based on common recognition in the technical field according to the present invention. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

On the other hand, for the upstream signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.

The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. The transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.

The transmission / reception unit 103 transmits a downlink signal to the user terminal 20 using at least the unlicensed band. For example, the transmission / reception unit 103 transmits DRS including CSI-RS frequency-multiplexed with PSS / SSS in the unlicensed band in the DMTC period set in the user terminal 20.

Further, the transmission / reception unit 103 receives an uplink signal from the user terminal 20 using at least the unlicensed band. The transmission / reception unit 103 may receive a result of RRM measurement and / or CSI measurement (for example, CSI feedback) from the user terminal 20 in a license band and / or an unlicensed band.

Further, the transmission / reception unit 103 transmits common control information and / or unique control information. Here, the common control information includes at least one of CRS information, CSI-RS / IM information, DRS information, and burst information. The unique control information includes at least one of final subframe information and DRS information. In addition, the transmission / reception unit 103 transmits higher layer control information.

Further, the common control information transmitted by the transmission / reception unit 103 may include final subframe information.

FIG. 13 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 13 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 13, the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. ing.

The control unit (scheduler) 301 controls the entire radio base station 10. When scheduling is performed by one control unit (scheduler) 301 for the license band and the unlicensed band, the control unit 301 controls communication between the license band cell and the unlicensed band cell. The control unit 301 may be a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The control unit 301 controls signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example. The control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.

The control unit 301 schedules system information, downlink data signals transmitted by PDSCH, downlink control signals (common control information and unique control information) transmitted by PDCCH and / or EPDCCH, and common control information transmitted by extended PCFICH. (Eg, resource allocation) is controlled. It also controls scheduling of synchronization signals (PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals such as CRS, CSI-RS, and DMRS.

The control unit 301 also transmits an uplink data signal transmitted on the PUSCH, an uplink control signal transmitted on the PUCCH and / or PUSCH (for example, a delivery confirmation signal (HARQ-ACK)), a random access preamble transmitted on the PRACH, Controls scheduling of uplink reference signals and the like.

The control unit 301 controls the transmission of the downlink signal to the transmission signal generation unit 302 and the mapping unit 303 according to the LBT result obtained by the measurement unit 305. Specifically, the control unit 301 controls generation, mapping, transmission, and the like of various signals included in the DRS so that DRS (LAA DRS) is transmitted in the unlicensed band.

Here, the control unit 301 may control the generation and mapping of the above-described common control information and / or unique control information. Specifically, the control unit 301 controls generation of common control information transmitted via the extended PCFICH obtained by extending PCFICH, encoding (for example, joint encoding), modulation, and mapping between the CFI and the common control information. (First embodiment, FIGS. 6-8). Note that at least one of the coding rate of extended PCFICH, the number of resource elements to be mapped, and the modulation scheme is different from PCFICH.

Alternatively, the control unit 301 performs control so as to add CRC scrambled by RNTI or SI-RNTI for cells in the unlicensed band to the common control information (second and third modes). Further, the control unit 301 allocates the common control information with the CRC added to the common search space of the unlicensed band cell or the downlink control channel (PDCCH or EPDCCH) of the primary cell that performs CA or DC with the cell. To control.

In addition, when providing a common search space in the EPDCCH, the control unit 301 performs control so that information regarding the presence or absence of the common search space in the EPDCCH or resource information to which the common search space is allocated is transmitted by higher layer signaling. (Second and third aspects).

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301. Further, the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on the result of CSI measurement in each user terminal 20. Also, the transmission signal generation unit 302 generates a DRS including PSS, SSS, CRS, CSI-RS, and the like.

Also, the transmission signal generation unit 302 generates common control information and unique control information (including encoding processing, modulation processing, and the like) based on an instruction from the control unit 301. Specifically, the transmission signal generation unit 302 generates common control information transmitted through the extended CFI notification channel by changing at least one of the coding rate, the number of resource elements, and the modulation scheme from the existing PCFICH. (First embodiment). Alternatively, the transmission signal generation unit 302 may add CRC scrambled with RNTI or SI-RNTI for cells of an unlicensed band to the common control information (second and third modes).

The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301. The reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.

The measurement unit 305 performs measurement on the received signal. The measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

Based on an instruction from the control unit 301, the measurement unit 305 performs LBT on a carrier (for example, an unlicensed band) in which LBT is set, and the LBT result (for example, whether the channel state is idle or busy). Is output to the control unit 301.

The measurement unit 305 may measure, for example, the received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal. . The measurement result may be output to the control unit 301.

<User terminal>
FIG. 14 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmission / reception unit 203 can transmit / receive UL / DL signals in an unlicensed band. The transmission / reception unit 203 may be capable of transmitting / receiving UL / DL signals in a license band.

The transmission / reception unit 203 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device, which are described based on common recognition in the technical field according to the present invention. The transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. In addition, broadcast information in the downlink data is also transferred to the application unit 205.

On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203. The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

Note that the transmission / reception unit 203 receives a downlink signal transmitted from the radio base station 10 using at least the unlicensed band. For example, the transmission / reception unit 203 receives a DRS including a CSI-RS that is frequency-multiplexed with the PSS / SSS in an unlicensed band during the DMTC period set from the radio base station 10.

Further, the transmission / reception unit 203 transmits an uplink signal to the radio base station 10 using at least an unlicensed band. For example, the transmission / reception unit 203 may transmit the result of RRM measurement of DRS and / or CSI measurement (for example, CSI feedback) in the license band and / or the unlicensed band.

Further, the transmission / reception unit 203 receives common control information and / or unique control information. The transmission / reception unit 203 receives higher layer control information.

FIG. 15 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 15, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. At least.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403. The control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.

The control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10. The control unit 401 generates an uplink control signal (for example, an acknowledgment signal (HARQ-ACK)) or an uplink data signal based on a downlink control signal, a result of determining whether retransmission control is necessary for the downlink data signal, or the like. To control.

The control unit 401 controls the reception signal processing unit 404 and the measurement unit 405 to perform RRM measurement and / or CSI measurement and cell search in the unlicensed band. The RRM measurement may be performed using LAA DRS. Also, CSI measurement may be performed using LAA DRS or CSI-RS / IM. Further, the control unit 401 may control transmission of the uplink signal to the transmission signal generation unit 402 and the mapping unit 403 according to the LBT result obtained by the measurement unit 405.

Specifically, the control unit 401 may control the reception processing of the above-described common control information and / or unique control information. Specifically, the control unit 401 may control reception processing (for example, demodulation, decoding, etc.) of common control information via the extended PCFICH (first mode, FIGS. 6-8).

Alternatively, the control unit 401 may perform control so as to perform reception processing (for example, blind decoding, demodulation, decoding, etc.) of common control information allocated to the common search space of the downlink control channel of the cell of the unlicensed band ( Second aspect). When the DCI can be normally decoded by the CRC descrambled by the RNTI or SI-RNTI for the cell of the unlicensed band, the control unit 401 replaces the DCI of the existing format to which the CRC is added with the above-described common control information. .

Alternatively, the control unit 401 performs reception processing (for example, blind decoding, demodulation, decoding, etc.) of common control information allocated to a common search space of a downlink control channel of a primary cell that performs CA or DC with an unlicensed band cell. (3rd aspect) may be controlled. When the DCI can be normally decoded by the CRC descrambled by the RNTI for the cell of the unlicensed band, the control unit 401 replaces the DCI of the existing format to which the CRC is added with the above-described common control information.

In addition, when providing a common search space in the EPDCCH, the control unit 401 allocates a common search space based on information signaled by higher layers (for example, information on the presence / absence of the common search space in the EPDCCH and resource information itself). Information may be detected (second and third modes).

Further, the control unit 401 receives specific control information allocated to the user specific search space of the downlink control channel of the primary cell that performs DC with the cell of the unlicensed band (for example, blind decoding, demodulation, decoding, etc.) You may control to perform.

In addition, the control unit 401 may measure, synchronize, and perform PDSCH of channel state information (CSI) in a subframe in which the common control information and / or unique control information is received based on the common control information and / or unique control information. At least one of demodulation and rate matching may be controlled. For example, the control unit 401 controls at least one of synchronization, CSI measurement based on CRS, demodulation of PDSCH, and rate matching based on the above-described CRS information.

In addition, the control unit 401 may control CSI measurement in the DRS subframe based on the above-described CSI-RS / IM information. Alternatively, the control unit 401 may control CSI measurement and / or rate matching in the DRS subframe based on the above DRS information. In addition, the control unit 401 may perform control so that CSI measurement is performed in a subframe including PSS, SSS, and CRS detected first in DMTC. Moreover, the control part 401 may average the result of the CSI measurement in the same burst based on the above-mentioned burst information. In addition, the control unit 401 may control demodulation and / or rate matching of the PDSCH mapped to the final subframe based on the above-described final subframe information.

Further, the control unit 401 recognizes the signal configuration of the last subframe of the burst based on the above-described last subframe information, and based on the recognition result, the RRM measurement, CSI measurement, and PDSCH rate in the last subframe of the burst At least one of the matchings may be controlled.

Specifically, based on the number of OFDM symbols indicated by the last subframe information, the control unit 401 recognizes whether or not PSS / SSS is normally allocated in subframes # 0 and # 5 to which PSS / SSS is allocated. Good. For example, when the number of OFDM symbols indicated by the last subframe information in subframe # 0 or # 5 is less than a predetermined number, control section 401 assumes that PSS / SSS is not included in subframe # 0 or # 5. May be. Here, the predetermined number may be 14 or 7 in the case of a normal CP, for example.

Further, based on the number of OFDM symbols indicated by the last subframe information, the control unit 401 determines whether or not CSI-RS / IM is allocated in a subframe having a predetermined period (for example, a period of 5 or 10 ms) set by higher layer signaling. You may recognize it. For example, when the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined period is less than the predetermined number, the control unit 401 may assume that CSI-RS / IM is not included in the subframe. . Here, the predetermined number may be 14 or 11 in the case of a normal CP, for example.

In addition, the control unit 401, in the subframe, based on the number of OFDM symbols indicated by the final subframe information in the subframe having the predetermined period and the CSI-RS configuration (see FIG. 17) notified by higher layer signaling. The presence / absence of CSI-RS / IM assignment may be recognized.

In addition, when the number of OFDM symbols indicated by the last subframe information in the subframe having the predetermined cycle is less than a predetermined number (for example, 14 in the case of normal CP), the control unit 401 assigns a normal CSI-RS / IM. You may assume the allocation pattern different from a pattern (refer FIG. 17). The different allocation patterns may be configured by, for example, OFDM symbols # 0 to # 6 in FIG. *

The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403. The transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 402 generates an uplink control signal related to a delivery confirmation signal (HARQ-ACK) or channel state information (CSI) based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.

The mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203. The mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.

Also, the reception signal processing unit 404 performs reception processing (demapping, demodulation, decoding, etc.) of common control information and unique control information based on an instruction from the control unit 401. Specifically, the received signal processing unit 404 may perform demodulation, decoding, and the like of the common control information transmitted by the extended PCFICH (first mode). The received signal processing unit 404 blind-decodes common control information assigned to a common search space of an unlicensed band cell or primary cell, and is descrambled by an RNTI or SI-RNTI for the cell of the unlicensed band. The common control information may be decoded based on the second and third aspects. Reception signal processing section 404 may perform blind decoding on unique control information allocated to a user-specific search space of an unlicensed band cell or primary cell.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example. The reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. The measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

The measurement unit 405 may perform LBT on a carrier (for example, an unlicensed band) on which LBT is set based on an instruction from the control unit 401. The measurement unit 405 may output an LBT result (for example, a determination result of whether the channel state is idle or busy) to the control unit 401.

Further, the measurement unit 405 may measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ), channel state, and the like of the received signal. For example, the measurement unit 405 performs RRM measurement of LAA DRS. The measurement result may be output to the control unit 401.

<Hardware configuration>
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.

For example, a wireless base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the wireless communication method of the present invention. FIG. 16 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention. The wireless base station 10 and the user terminal 20 described above physically include a central processing unit (processor) 1001, a main storage device (memory) 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, You may comprise as a computer apparatus containing the bus | bath 1007 grade | etc.,. In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like.

Each function in the radio base station 10 and the user terminal 20 is performed by causing the central processing unit 1001 to perform computation by reading predetermined software (program) on hardware such as the central processing unit 1001 and the main storage device 1002. This is realized by controlling communication by the device 1004 and reading and / or writing of data in the main storage device 1002 and the auxiliary storage device 1003.

The central processing unit 1001 controls the entire computer by operating an operating system, for example. The central processing unit 1001 may be configured by a processor (CPU: Central Processing Unit) including a control device, an arithmetic device, a register, an interface with peripheral devices, and the like. For example, the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the central processing unit 1001.

The central processing unit 1001 reads programs, software modules, and data from the auxiliary storage device 1003 and / or the communication device 1004 to the main storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the main storage device 1002 and operating on the central processing unit 1001, and may be realized similarly for other functional blocks.

The main storage device (memory) 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example. . The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of a flexible disk, a magneto-optical disk, a CD-ROM (Compact Disc ROM), a hard disk drive, and the like.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input. The output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the central processing unit 1001 and the main storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses. Note that the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of the devices illustrated in the figure, or may be configured not to include some devices. .

Further, the radio base station 10 and the user terminal 20 may be configured to include hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). Thus, a part or all of each functional block may be realized.

Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal (signaling). The signal may be a message. In addition, a component carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, or the like.

In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by a predetermined index.

The information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

Each aspect / embodiment described in this specification may be used alone, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.

The notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods. For example, notification of information includes physical layer signaling (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)). ), SIB (System Information Block)), MAC (Medium Access Control) signaling), other signals, or a combination thereof. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.

Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation). mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems and / or extensions based on them Applied to the next generation system.

The processing procedures, sequences, flowcharts and the like of each aspect / embodiment described in this specification may be switched in order as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. For example, each of the above aspects / embodiments may be used alone or in combination. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

This application is based on Japanese Patent Application No. 2015-210954 filed on October 27, 2015 and Japanese Patent Application No. 2015-217391 filed on November 5, 2015. All this content is included here.

Claims

In LAA SCell (License-Assisted Access Secondary Cell), a receiving unit that receives common control information via a downlink control channel;
And a control unit that controls communication processing in the LAA SCell based on the common control information.
The user terminal according to claim 1, wherein the control unit controls measurement of channel state information (CSI) based on the common control information.
The user terminal according to claim 1 or 2, wherein the control unit controls averaging of the CSI measurement results of a plurality of subframes based on the common control information.
4. The cyclic redundancy check (CRC) scrambled by the wireless network temporary identifier (RNTI) for the LAA SCell is added to the common control information. The described user terminal.
The user terminal according to any one of claims 1 to 4, wherein the common control information is a DCI (Downlink Control Information) format 1C.
The control unit assumes that PSS (Primary Synchronization Signal) and / or SSS (Secondary Synchronization Signal) is not included when the number of OFDM symbols indicated by the common control information is less than a predetermined number. The user terminal according to any one of claims 1 to 5.
A generating unit that generates common control information used for controlling communication processing in LAA SCell (License-Assisted Access Secondary Cell);
In the LAA SCell, a radio base station comprising: a transmission unit that transmits the common control information via a downlink control channel.
A wireless communication method between a wireless base station and a user terminal in LAA SCell (License-Assisted Access Secondary Cell), wherein the user terminal
In the LAA SCell, receiving common control information via a downlink control channel;
And a step of controlling communication processing in the LAA SCell based on the common control information.