KR20160010850A - Methods for configuring the resources in an unlicensed spectrum cell and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method for setting resources of a cell. More specifically, the present invention relates to a method and device for setting resources to use an unlicensed spectrum cell. In particular, a method for transceiving data of a terminal according to the present invention comprises the following steps: constituting a carrier combined or dual connectivity by using an unlicensed spectrum cell and a licensed spectrum cell; and transceiving data based on assignment of wireless resources in an unlicensed spectrum cell.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for setting a resource of a license-

The present invention relates to a cell resource setting method, and more particularly, to a resource setting method and apparatus for using an unlicensed spectrum cell.

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. In a mobile communication system such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series, a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data outside a voice- It is required to develop a technique capable of transmitting large-capacity data in accordance with the above-described method. It is possible to efficiently transmit data using a plurality of cells in a method for transmitting a large amount of data.

In such a situation, a technique of expanding a large number of small base stations having a relatively narrow coverage such as a small cell is discussed in order to transmit a large amount of data at a high speed and stably transmit and receive data in an environment in which a plurality of terminals are concentrated in a specific base station In fact.

Also, discussion is being made on dual connectivity for performing communication with a terminal using such a small cell and an existing macro cell. In this dual connectivity situation, a terminal can perform wireless communication with a plurality of base stations.

On the other hand, there is an increasing need to use frequency bands shared with a large number of communication systems. This is due to the shortage of the frequency band used in the mobile communication system and the necessity of the processing of the large capacity data, and studies are being made on a method of using the shared frequency and the license-exempt band used in the Wi-Fi system in the mobile communication system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a specific method and apparatus for transmitting and receiving data using a frequency band that can be shared by other communication systems or other communication systems operated by other operators.

In addition, the present invention proposes a concrete procedure and a data retransmission method when a terminal and a base station perform dual connectivity or carrier merging using an unlicensed band cell.

According to another aspect of the present invention, there is provided a method of transmitting and receiving data in a terminal, the method comprising: constructing a carrier merging or dual connectivity using an unlicensed band cell and a licensed band cell; The method comprising the steps < RTI ID = 0.0 > of: < / RTI >

According to another aspect of the present invention, there is provided a method of transmitting and receiving data between a base station and a base station, comprising the steps of: setting up a carrier merging or dual connectivity using a license-exempt band cell and a license band cell; and transmitting and receiving data based on radio resource allocation in the license- . ≪ / RTI >

In addition, the present invention provides a mobile communication system including a control unit for constructing a carrier merging or dual connectivity using a license-exempt band cell and a license band cell, a transmitter for transmitting data based on a radio resource allocation in a license-exempt band cell, And a receiving unit for receiving data based on the received data. .

The present invention also provides a radio communication system including a controller for setting a carrier merging or dual connectivity using a license-exempt band cell and a license band cell, a transmitter for transmitting data based on radio resource allocation in a license-exempt band cell, And a receiver for receiving data based on the received data.

The present invention also relates to a method and apparatus for configuring a carrier merging using a license-exempt band cell and a licensed band cell to monitor the reception of data in the license-exempt band cell and to re- Wherein the scheduling information includes information indicating that the data is unsuccessfully received in the license-exempt band cell.

The present invention also relates to a method of transmitting data in an unlicensed band cell, when carrier merging is configured using a license-exempt band cell and a licensed band cell, and transmitting data in an unlicensed band cell, And transmitting the scheduling information, wherein the scheduling information includes information indicating that the data is unsuccessfully received in the license-exempt band cell.

The present invention also relates to a mobile communication system comprising a control unit for configuring a carrier merging using a license-exempt band cell and a license band cell to monitor reception of data in an unlicensed band cell, Wherein the scheduling information includes information indicating that the data is data that has failed to be received in the license-exempt band cell.

In addition, the present invention provides a method for transmitting data in a control unit and an unlicensed band cell, which constitute a merger of carriers using a license-exempt band cell and a license band cell, to the terminal, and, when the terminal fails to receive data, And the scheduling information includes information indicating that the data is data that has failed to be received in the unlicensed band cell.

According to the above description, data can be transmitted and received using the license-exempt band cell, and high-speed and large-capacity data can be processed.

In addition, the present invention provides a specific procedure for configuring a license-exempted band cell with dual connectivity or carrier merging, thereby providing an effect of preventing ambiguity of terminal and base station operations.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a small cell development according to an embodiment. Fig.
2 is a diagram showing a small cell deployment scenario.
3 to 6 are diagrams showing detailed scenarios in the small cell deployment.
Figure 7 is a diagram showing various scenarios of carrier merging.
FIG. 8 is a diagram illustrating an example of a dual connectivity scenario to which the present invention can be applied.
9 is a diagram showing an example of a dual connectivity structure.
10 is a diagram showing another example of the dual connectivity structure.
11 is a diagram for explaining a deployment scenario to which the present invention can be applied.
12 is a diagram for explaining a license-exempt band cell.
13 is a diagram for explaining a terminal operation according to an embodiment of the present invention.
14 is a diagram for explaining a terminal operation according to another embodiment of the present invention.
15 is a view for explaining a base station operation according to another embodiment of the present invention.
16 is a view for explaining a base station operation according to another embodiment of the present invention.
17 is a diagram for explaining a UE operation for HARQ retransmission according to the present invention.
18 is a view for explaining a base station operation for HARQ retransmission according to the present invention.
19 is a diagram for explaining a terminal configuration according to another embodiment of the present invention.
20 is a view for explaining a base station configuration according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

The following describes a small cell deployment scenario to which the proposals described in the present invention can be applied.

1 is a view showing a small cell development according to an embodiment.

FIG. 1 shows a configuration in which a small cell and a macro cell coexist. In FIGS. 2 to 3, the presence or absence of macro coverage, whether the small cell is for outdoor use or indoor use, , Whether the development of the small cell is sparse or dense, or whether the same frequency spectrum as the macro is used in terms of spectrum or not.

2 is a diagram showing a small cell deployment scenario. Figure 2 shows a typical representative configuration for the scenario of Figure 3; Fig. 2 shows a small cell deployment scenario and includes scenarios # 1, # 2a, # 2b, and # 3. 200 represents a macro cell, and 210 and 220 represent a small cell. The overlapping macrocells in FIG. 2 may or may not exist. Coordination can be performed between the macro cell 200 and the small cells 210 and 220 and adjustment can also be performed between the small cells 210 and 220. And the overlapping regions of 200, 210, and 220 can be clustered.

3 to 6 are diagrams showing detailed scenarios in the small cell deployment.

Fig. 3 shows scenario # 1 in the small cell expansion. Scenario 1 is a co-channel deployment scenario for small cells and macro cells in the presence of overhead macros and is an outdoor small cell scenario. 3 shows a case where both the macro cell 311 and the small cell are outdoors, and 312 denotes a small cell cluster. Users are distributed both indoors / outdoors.

The solid lines connecting the small cells in the small cell cluster 312 mean a backhaul link within the cluster. The dotted lines connecting the base station of the macro cell and the small cells in the cluster mean a backhaul link between small cells and macro cells.

Fig. 4 shows the small cell deployment scenario # 2a. Scenario 2a is a deployment scenario in which small cells and macros use different frequency spectra in the presence of an overlaid macro, and is an outdoor small cell scenario. Both the macro cell 411 and the small cells are outdoors and 412 indicates a small cell cluster. Users are distributed both indoors / outdoors.

The solid lines connecting the small cells in the small cell cluster 412 mean a backhaul link within the cluster. The dotted lines connecting the base station of the macro cell and the small cells in the cluster mean a backhaul link between small cells and macro cells.

5 shows the small cell deployment scenario # 2b. Scenario 2b is a deployment scenario in which the small cell and the macro use different frequency spectrum in the presence of the overlay macro and is an indoor small cell scenario. The macro cell 511 is outdoors, the small cells are all indoors, and 512 is a small cell cluster. Users are distributed both indoors / outdoors.

The solid lines connecting the small cells in the small cell cluster 512 mean a backhaul link within the cluster. The dotted lines connecting the base station of the macro cell and the small cells in the cluster mean a backhaul link between small cells and macro cells.

6 shows the small cell deployment scenario # 3. Scenario 3 is an indoor small cell scenario with no coverage of macros. 612 indicates a small cell cluster. In addition, the small cells are all indoor and users are dispersed both indoors and outdoors.

The solid lines connecting the small cells in the small cell cluster 612 mean a backhaul link within the cluster. The dotted lines connecting the base station of the macro cell and the small cells in the cluster mean a backhaul link between small cells and macro cells.

The frequencies F1 and F2 used in the various small cell scenarios of FIGS. 1 and 2 to 6 described above may be frequencies that support the same duplex mode, or F1 and F2 may have different duplex modes , For example, F1 may be considered to support FDD mode, F2 may be considered to support TDD mode, or vice versa.

Figure 7 is a diagram showing various scenarios of carrier merging.

As shown in FIG. 7, the F1 and F2 may be frequencies that support the same duplex mode under a carrier merging scenario, or F1 and F2 may support frequencies that support different duplex modes.

710, the F1 and F2 cells are co-located and overlaid under almost the same coverage. The two layers are scenarios that provide sufficient coverage and mobility, and can be aggregated between overlapping F1 and F2 cells.

720 is a scenario where F1 and F2 cells are co-located and overlaid, but coverage of F2 is smaller than F1. F1 has sufficient coverage, mobility support is based on F1 coverage, F2 is a scenario used to improve throughput, and it is possible to merge overlapping F1 and F2 cells.

730 is a scenario where F1 and F2 cells are co-located, while F2 antennas are directed to cell boundaries to increase cell edge throughput. Mobility support is performed based on F1 coverage, F1 has sufficient coverage, F2 is a scenario with provisional coverage holes, and F1 and F2 cells in the same eNB can be merged where coverage is overlapped. This is a scenario.

Scenario 740 is a scenario in which F1 has macro coverage and RRH in F2 is used to improve throughput in a hot spot region. The mobility support is based on F1 coverage and is combined with the F1 macrocell F2 RRHs is a scenario where cells can be merged.

750 is a scenario similar to the scenario of 720 in which frequency selective repeaters are deployed for coverage expansion of one carrier. It is a scenario where F1 and F2 cells in the same eNB can be merged where coverage is overlapped.

In the case of supporting Carrier Aggregation (CA), carrier merging is considered in each mode of FDD and TDD duplex mode. Carrier merging in the same duplex mode as FDD and TDD is considered In the case of consideration, component carriers (CCs) are separately set as follows.

Primary Cell (PCell)

When the CA is configured, the UE has one RRC connection with the network and one serving cell is connected to the NAS mobility (RRC connection establishment / re-establishment / handover) NAS mobility information, and one serving cell provides a security input at the time of RRC connection re-establishment / handover. A cell providing this function is called a primary cell (PCell). The carrier corresponding to PCell in the downlink is a downlink primary component carrier (DL PCC) and the uplink is an uplink primary component carrier (UL PCC).

- PCell can only be changed by handover procedure.

- PCell is used for transmission of PUCCH.

Unlike SCells, PCells can not be de-activated.

- Re-establishment is triggered when PCell experiences RLF (Radio Link Failure) and is not triggered if SCell experiences RLF.

- NAS information is obtained from PCell.

Secondary Cell (SCell)

- Depending on the UE capability, the SCells can be configured in the form of a set of serving cells with PCell. The carrier corresponding to the SCell in the downlink is a downlink secondary component carrier (DL SCC), and the carrier corresponding to the SCell in the uplink is an uplink secondary component carrier (UL SCC) to be.

A set of serving cells configured in one terminal always consists of one PCell and one or more SCell. The number of serving cells that can be configured depends on the aggregation capability of the terminal.

Reconfiguration, SCells addition and removal operations can be performed by the RRC, and upon intra-LTE handover, the RRC can reconfigure, add or remove SCells for use with the target PCell . When adding a new SCell, dedicated RRC signaling is used to transfer all required SCELL system information. In Connected mode, the terminal does not need to get broadcasted system information directly from SCells.

Dual Connectivity

FIG. 8 is a diagram illustrating an example of a dual connectivity scenario to which the present invention can be applied.

The scenario of FIG. 8 relates to inter-node radio resource aggregation for improving the terminal transmission rate from different nodes under dual connectivity, and it is possible to use one or more base stations for user plane data transmission Lt; RTI ID = 0.0 > wireless < / RTI >

Dual connectivity represents an operation in which an RRC_CONNECTED terminal uses radio resources provided by at least two different network points (e. G., Master eNB and Secondary eNBs) connected by a non-ideal backhaul. In a dual connectivity, a master eNB refers to a base station that terminates the S1-MME and acts as a mobility anchor toward a core network (CN). The Master eNB may be referred to as a master base station or a MeNB or a Macro eNB or a macrocell eNB. In the dual connectivity, the secondary eNB is a base station that provides additional radio resources for the UE, not a master eNB. The secondary eNB may be referred to as a secondary base station or an SeNB or a small cell eNB or a Small eNB or an assisting eNB. At this time, the group of serving cells associated with MeNB is referred to as MCG (Master Cell Group), and the group of serving cells associated with SeNB is referred to as SCG (Secondary Cell Group). Here, the associated serving cells may refer to a serving cell provided by the corresponding base station.

SeNB has at least one special cell containing a PUCCH. That is, at least one serving cell associated with SeNB has a configured uplink. And one of them is configured with a PUCCH resource (at least one cell in SeNB has been configured for UL and one of them is configured with PUCCH resources).

9 is a diagram showing an example of a dual connectivity structure.

9 shows an example of a dual connectivity structure using radio resources provided by two base stations connected by a non-ideal backhaul. When dual connectivity is configured in the UE with the structure shown in FIG. 9, the UE can configure a specific data radio bearer as a dedicated BS bearer. For example, the UE may configure a specific radio bearer for voice service as a MeNB dedicated data radio bearer (MCG radio bearer), and a specific radio bearer for Internet service as a SeNB dedicated data radio bearer (SCG radio bearer) Can be configured. For a specific MCG data radio bearer or a specific SCG radio bearer, only one base station has a PDCP entity, an RLC entity, and a MAC entity. The terminal has an entity in the terminal peered to the entity.

10 is a diagram showing another example of the dual connectivity structure.

10 shows another example of a dual connectivity structure using radio resources provided by two base stations connected by a non-ideal backhaul. When dual connectivity is configured in the UE with the structure shown in FIG. 10, the UE can configure a specific data radio bearer (Split) through two base stations (MeNB and SeNB). Hereinafter, the bearer separated by two base stations is referred to as a separate radio bearer (MCG-SCG radio bearer) or a split bearer. For a specific separated data radio bearer, each base station has independent RLC entity (MeNB is MeNB RLC entity, SeNB is SeNB RLC entity) and MAC entity (MeNB is MeNB MAC entity and SeNB is SeNB MAC entity). The terminal has an entity in the terminal peered to the entity.

In this specification, when a UE configures dual connectivity, it terminates a base station or an S1-MME that establishes an RRC connection with a UE and provides a cell (e.g., PCell) serving as a reference for handover, a base station serving as a mobility anchor is described as a master base station, a MeNB, or a first base station as needed.

The master base station or the MeNB may be a base station providing a macro cell and may be a base station providing any small cell in a dual connectivity situation between small cells.

On the other hand, a base station, which is distinguished from the master base station in the dual connectivity environment and provides additional radio resources to the terminal, is described as a secondary base station, a SeNB, or a second base station as needed.

Each of the master base station and the secondary base station can provide at least one cell to the terminal, and the master base station and the secondary base station can be connected through the interface between the master base station and the secondary base station.

To facilitate understanding, a cell associated with a master base station may be referred to as a macro cell, and a cell associated with a secondary base station may be referred to as a small cell. However, in the above-described small cell cluster scenario, the cell associated with the master base station may also be described as a small cell.

The macrocell in the present invention may mean each of at least one or more cells and may be described in a meaning representing all the cells associated with the master base station. Also, the small cell may mean at least one or more cells, and may be written in a meaning that represents the entire cell associated with the secondary base station. However, as described above, in a specific scenario, such as a small cell cluster, it may be a cell associated with the master base station. In this case, the cell of the secondary base station may be described as another small cell or another small cell.

However, in the following description of the embodiment, for convenience of description, it is possible to associate a macro cell with a master base station or a first base station, and associate a small cell with a secondary base station or a second base station, but the present invention is not limited thereto, The present invention is also applicable to a situation where a base station or a second base station can be associated with a macro cell and a master base station or a first base station is associated with a small cell.

11 is a diagram for explaining a deployment scenario to which the present invention can be applied.

Referring to FIG. 11, a license-exempt band cell refers to a cell using an unlicensed spectrum or a shared spectrum frequency. That is, the license-exempted band cell refers to a component carrier that performs LTE-based data transmission in a license-unlicensed band or a shared band using a licensed assisted access method.

Meanwhile, various scenarios may be considered as shown in FIG. 11 in the case of using the license-exempt band cell. As an example, a scenario may be considered in which the license band cell and the license-exempted band cell operate in a carrier merging fashion. As another example, a scenario may be considered in which licensed-band small cells and license-exempted band cells form a carrier merging form. As another example, a scenario may be considered in which the license band cell that covers macro coverage and the license-exempt band cell constitute dual connectivity. In other words, the following three scenarios can be considered.

- Licensed macro cell + licensed small cell + unlicensed small cell -> Carrier merging and dual connectivity configuration

- Licensed macro cell + unlicensed small cell -> Dual connectivity configuration

- licensed small cell + unlicensed small cell -> carrier merged configuration

In addition, the license band cell and the license-exempt band cell can be combined into various scenarios, and the present invention can be applied to each scenario.

12 is a diagram for explaining a license-exempt band cell.

The license-exempted band cell will be described in more detail with reference to FIG. In the case of a license-exempt band cell that is formed by a licensee through a license-exempt band frequency, the corresponding frequency band may be used by another license-accessing band cell or another radio access technology (RAT) such as WiFi, Bluetooth, Because it is shared with the system, the corresponding frequency band can not be used exclusively. Accordingly, when the corresponding frequency band is available through the LBT (Listen before talk), it is possible to support the terminal by configuring the license-exempt band cell through the frequency of the corresponding license-exempt band for a specific time. However, even if the license-exempt band cell is configured through the license-exempt band frequency, the frequency band should be emptied for another service provider or another communication system for a specific time after a predetermined time.

In the present invention, for convenience of understanding, as shown in FIG. 12, a time period in which an operator configures a license-exempt band cell in an arbitrary frequency band and can support a terminal of the corresponding provider is referred to as a license- And the time period in which the license-exempted band cell can not be constructed in the frequency band is referred to as the license-exempted band cell inaccessible period. However, this is also for convenience of explanation, and does not limit the name.

As described above, the transmission / reception technologies used in the conventional LTE or LTE-Advanced are considered to be used in the license band, and operation in the license-exempt band is not considered.

The corresponding time and frequency resources of the licensed band could be used with full flexibility with ease, depending on the configuration of the base station. However, since the time and frequency resources in the license-exempted band can be used in other heterogeneous networks due to the characteristics of the license-exempted band, there is a problem in using the time and frequency resources flexibly according to the setting of the base station. In addition, when transmitting and receiving data in a manner used in existing LTE or LTE-Advanced in the license-exempt band, it is difficult to ensure reliability of transmission / reception data.

Accordingly, the present invention proposes a concrete method of transmitting / receiving data by constructing a carrier merging or dual connectivity using a license-exempt band cell and a license band cell. In addition, the present invention proposes a method of ensuring higher reliability in data transmission and reception in a license-exempt band cell.

License-exempt band  How to define specific procedures for adding and activating cells.

The UE according to an embodiment of the present invention includes a step of receiving a reference signal for RRM measurement and channel measurement of a license-exempt band cell, a step of transmitting a RRM measurement result and a channel quality measurement result of the license- Step < / RTI > That is, the base station can receive the RRM measurement result and the channel quality measurement result of the license-exempt band cell from the terminal in order to configure the license-exempt band cell in the terminal and use it for data transmission and reception. To do this, the terminal measures the RRM and channel quality of the license-exempted band cell based on the reference signal and transmits the result to the base station.

The channel quality measurement result for the license-exempted band cell may be used as a precondition for constructing a carrier merge or dual connectivity to the terminal, or may be used for determining whether to activate the license-exempt band cell configured in the terminal.

However, when the activation of the license-exempt band cell, which is constructed by adding the secondary cell (SCell) to the terminal, follows a SCell activation condition used in the conventional LTE technology, a sample that can perform SCell measurement (SCell) There is a problem in that the number of cells may be small. In other words, since a mechanism such as Listen Before Talk (LBT) is used in a license-exempt band cell, the number of usable subframes or radio resources may be small and it is difficult to apply the existing LTE RRM measurement and channel measurement mechanism. This is because, as described above, the frequency of the license-exempt band cell can enter the unavailable section after performing the LBT by using the frequency band that the license-exempt band cell shares with the plurality of communication systems. Therefore, the present invention proposes a specific method for solving the problem that can not be solved by the channel measurement mechanism of the existing LTE system.

For example, considering that the reference signal for channel measurement in the existing New Carrier Type (NCT) can satisfy the requirement for RRM measurement when the CRS port 0 is transmitted with a period of 5 ms only, The transmission of the CRS port 0 having the 5-ms period can be considered so that the RRM measurement can be performed also for the band-cell transmission.

As another example, in a license-exempt band cell, a transmission with a period of 5 ms may not be guaranteed, so a reference signal may be transmitted to guarantee RRM measurement within a time unit of less than 1 ms or 1 ms. Specifically, reference signal transmission in a short time unit such as PRS (Positioning Reference Signal) transmission may be considered.

As another example, if a transmission resource of the license-exempt band cell is set to a duty cycle (Duty cycle), a preset specific period, or a specific subframe set, resources for RRM measurement may be limited to available subframe resources. Therefore, it can be set to perform channel measurement based on a duty cycle or a specific period or a reference signal transmitted in a specific subframe set. That is, for the license-exempted band cell, RRM measurement can be performed based on CRS, CSI-RS, or Discovery RS transmitted in the available subframe resources, and reporting can be set to be instantaneously transmitted. In this case, by setting the channel quality measurement result to be transmitted in every subframe, the base station can control the SCell addition or activation operation based on the RRM measurement result of the unlicensed band cell.

As another example, in a license-exempted band cell, a frequency band is shared by a plurality of communication systems, and continuous resource use can not be guaranteed. Therefore, when the RRM measurement result and the channel measurement result transmission method using the existing communication method are used in the license-exempt band cell, the RRM measurement result and the channel measurement result may not be transmitted properly. In order to solve this problem, in the present invention, in addition to the RSRP and the RSRQ included in the RRM measurement in the instantaneous unlicensed band cell in the corresponding subframe, the SINR information and RSSI (Received Signal to Interference & Noise Ratio) Signal Strength Indicator) can be reported. That is, the SINR information and the RSSI result measured in each subframe are set to be transmitted to the base station as a channel quality measurement result in addition to the RSRP and RSRQ included in the RRM measurement, and the base station sets RSRP and RSRQ included in the received RRM measurement In addition, it can be defined to decide whether to add or activate SCell based on SINR information and RSSI. Specifically, as a method for measuring SINR and RSSI, a CRS can be used as a reference signal used in the past. For example, it can be configured to measure SINR and RSSI using CRS port 0 or CRS port 1 or both. As another example, as a method of measuring the SINR and the RSSI, a CSI-RS can be used as a reference signal used in the past. Specifically, it is possible to set SINR and RSSI to be measured using zero power CSI-RS and non-zero power CSI-RS.

License-exempt band  Scheduling for Cells ( scheduling ) Method and transmission mode ( transmission  mode)

In the case where the license-exempted band cell is additionally configured as SCell in the terminal, the license-exempt band cell may be set to a cross-carrier scheduling or a self-carrier scheduling scheme. Cross-carrier scheduling refers to a scheme for transmitting scheduling information for one cell through another cell, and self-carrier scheduling refers to a scheme for transmitting scheduling information for a corresponding cell through a corresponding cell. Hereinafter, the scheduling method of the license-exempt band cell and the transmission mode setting method according to the method will be described separately.

In one example, a license-exempt band cell may be configured to operate with only cross-carrier scheduling. That is, the license-exempted band cell that is further configured with SCell can be set only by the cross carrier scheduling scheme. For example, scheduling information for data transmission and reception in a license-exempt band cell may be transmitted in the PCell. Here, PCell may be a licensed band cell. That is, the UE can monitor the licensed band cell for receiving the scheduling information for the unlicensed band cell configured with SCell.

On the other hand, a CRS-based transmission mode may not be needed when the license-exempt band cell is set only by the cross carrier scheduling scheme. Therefore, the transmission mode of the license-exempt band cell can be set only in the DMRS-based transmission mode. This has the advantage of reducing load through CRS transmission / reception in the license-exempt band cell. That is, in the license-exempt band cell, control information including scheduling information is set not to be transmitted and received, so that data transmitted and received in the license-exempt band cell can be transmitted and received according to the DMRS-based transmission mode.

As another example, a license-exempt band cell may be enabled to use both cross-carrier scheduling or self-carrier scheduling schemes. That is, the license-exempt band cell may be configured by a cross-carrier scheduling method or a self-carrier scheduling method as needed. In the case where the license-exempt band cell is configured by the cross-carrier scheduling scheme, the CRS-based transmission mode may not be needed, and thus data transmitted and received in the license-exempt band cell may be set to the DMRS-based transmission mode. Therefore, the UE can operate based on only the scheduling in the DMRS-based transmission mode.

Alternatively, when the license-exempt band cell is configured by the self-carrier scheduling scheme, the setting of the UE may be classified according to the control channel through which the scheduling information is transmitted.

As an example of a self-scheduling scheme, a CRS for PDCCH decoding may be needed when scheduling information is received on the PDCCH. Accordingly, when the scheduling information is received through the PDCCH, the CRS-based transmission mode and the DMRS-based transmission mode can be flexibly used. That is, the UE can operate based on the CRS-based transmission mode and the DMRS-based transmission mode.

As another example in the case of the self-scheduling scheme, CRS is not needed when the scheduling information is received via the EPDCCH. Therefore, similar to the case of the cross-carrier scheduling method, data can be transmitted / received only in the DMRS-based transmission mode without excluding the CRS-based transmission mode. The UE can operate based on only the scheduling in the DMRS-based transmission mode.

Hereinafter, a resource setting method for a license-exempt band cell according to the present invention will be described with reference to the drawings.

13 is a diagram for explaining a terminal operation according to an embodiment of the present invention.

A terminal according to an embodiment of the present invention includes merging carriers or dual connectivity using a license-exempt band cell and a license band cell, and transmitting and receiving data based on a radio resource allocation in a license-exempt band cell. Here, the license-exempt band cell means a cell using a frequency band shared by one or more communication systems.

Referring to FIG. 13, the UE includes a merging of carriers or dual connectivity using a license-exempt band cell and a license band cell (S1310). For example, the terminal can configure the carrier merging using the license band cell and the license-exempt band cell according to the setting of the base station. Alternatively, the terminal may configure dual connectivity using the license band cell and the license-exempt band cell. The license band cell and the license-exempt band cell constituting the carrier merging or dual connectivity may each be one or more. That is, the terminal can construct a carrier merging or dual connectivity using one license band cell and one or more license-exclusion band cells. Likewise, a terminal may construct a carrier merge or dual connectivity using one or more license band cells and one or more license-exempt band cells. In this case, the UE can operate as self-carrier scheduling or cross-carrier scheduling as needed.

Meanwhile, the terminal includes transmitting and receiving data based on the radio resource allocation in the license-exempt band cell (S1320). For example, the terminal can transmit / receive data to / from the base station through the license-exempt band cell based on the radio resource allocation scheme in the license-exempt band cell. As described above, since a license-exempt band cell shares one frequency resource with one or more other shared systems, a radio resource allocation scheme different from a license band cell in which one communication system exclusively uses one frequency resource can be used . Therefore, the terminal can transmit and receive data through the license-exempt band cell based on the radio resource assignment set in the license-exempt band cell.

For example, radio resources in a license-exempt band cell may be allocated on a slot-by-slot basis. As another example, the radio resources in the license-exempt band cell may be allocated on a sub-frame basis or on a multiple sub-frame basis. Specifically, the radio resources in the license-exempt band cell may be allocated in units of 0.5 ms, or in units of sub-frames of 1 ms or units of 2 ms or more.

As another example, the radio resources in the license-exempt band cell may be allocated according to the frequency band of the license-exempt band cell. For example, different radio resource allocation schemes may be used depending on the frequency band used by each license-exempt band cell. In other words, the radio resources may be allocated in a predetermined time unit calculated by taking the maximum occupation time of another communication system such as WiFi sharing the frequency band of the license-exempted band cell as one element.

As another example, the radio resources in the license-exempt band cell may be allocated based on a duty cycle configuration that is classified according to the frequency band of the license-exempt band cell, the terminal, or the license-exempt band cell. Different wireless resource allocation schemes may be applied based on the duty cycle in that different duty cycles may be configured for each of the license-exempt band cells or for each terminal or for each frequency band of the license-exempt band cell.

As another example, the time and frequency resources of the license-exempted band cell may include time and frequency resources that are used only by the mobile communication system on a time axis, time and frequency resources that are exclusively used by the wireless LAN system, A method of setting the time and frequency resources that the system can share can be considered. In a section shared by the mobile communication system and the wireless LAN system, each communication system may use the corresponding wireless resource based on competition.

As another example, the radio resources in the license-exempt band cell may be allocated to a period or a subframe set that is determined based on the data retransmission timing in accordance with the HARQ retransmission operation. For example, in data transmission / reception between a base station and a mobile station, a radio resource allocation period or the like may be set so that data retransmission can be performed in consideration of HARQ retransmission timing for ensuring data transmission / reception quality.

The radio resource allocation or setting method of the license-exempted band cell as described above will be described in detail below by dividing the case of each embodiment.

License-exempt band  Resource subdivision ( Resource Granularity ) Setting method and time / frequency resource setting method

- How to consider allocation of slot units

A radio resource can be allocated on a slot-by-slot basis in that a usable unit of transmission resources in a license-exempt band cell may be smaller than a TTI (Time to interval) of 1 ms. For example, if a Listen before talk (LBT) mechanism is used to achieve co-existence with a WiFi or other carrier's mobile communication system, transmission to a TTI of 1 ms on an unlicensed band frequency may not be possible. Therefore, in this case, a radio resource allocation in units of 0.5ms can be performed on a slot basis.

- Consideration of allocation in subframe units

For example, the UE can measure channel state information (CSI) of a corresponding subframe through a reference signal transmitted in each subframe. The reference signal transmitted in each subframe may be CRS, CSI-RS or Discovery RS. In order to allow the base station to know CSI measurement results measured for link adaptation on a moment-by-moment basis, the UE may request Ack / Nack for downlink data transmission from the CSI measurement result measured in each subframe To the base station. That is, a method of applying the radio resource allocation for each subframe to the license-exempt band cell can be considered.

- Consideration of allocation of multiple subframes

When a radio resource is allocated in units of multiple subframes, the UE measures a channel state based on a reference signal received in each of two or more subframes constituting a plurality of subframes, and measures a channel And reporting the average information or the weighted average information of the state measurement information to the base station in units of multiple subframes.

Referring to FIG. 14, a terminal may configure carrier merging or dual connectivity using a license-exempt band cell (S1410). Carrier merging or dual connectivity may be configured using one or more license band cells or each of the license-exempt band cells, as described with reference to FIG.

Thereafter, the UE can report the channel state measurement information to the base station based on the radio resource allocation method (S1420). For example, the UE can measure channel state information (CSI) of a corresponding subframe through a reference signal transmitted in each subframe. In order to allow the base station to know CSI measurement results measured for link adaptation on a moment-by-moment basis, the UE may request Ack / Nack for downlink data transmission from the CSI measurement result measured in each subframe To the base station. However, in this case, the accuracy of the CSI measurement result information measured in each subframe unit may be degraded. Therefore, when resources that can be transmitted by the license-exempt band cell are allocated in multi-sub-frame units, the CSI measurement result information is averaged or weighted averaged, or the corresponding information is reported in multi-sub-frame units by another implementation method You can set it to do so. Through this, it is possible to reduce control information overhead due to CSI reporting in each subframe.

The MS can transmit and receive data in the license-exempt band cell according to the CSI measurement result and the BS scheduling (S1430). In this case, the radio resources in the license-exempt band cell for data transmission and reception can be allocated in units of the above-described multiple sub-frames.

- A method to allocate to the frame structure of the mobile communication system considering the frame structure used in other communication systems

Hereinafter, an example of the other communication system sharing the frequency bands of the mobile communication system and the unlicensed band cell will be described with reference to a wireless LAN (WLAN) system, but is not limited to the wireless LAN system.

Specifically, the length of time resources and the backoff time that one terminal can occupy the maximum in the WLAN are defined according to the QoS and the setting of the supporting physical layer. In terms of the length of the transmission resources that can be occupied the maximum, when the setting not using the OFDM scheme is followed, the maximum value is defined as 6.016 ms and 3.008 ms for video. On the other hand, when the setting using the OFDM scheme is followed, it is defined as 3.008 ms and 1.504 ms for video.

Therefore, in order to maintain coexistence with the WLAN, it is possible to perform resource setting that can be transmitted to the license-exempt band cell considering the length of the maximum WLAN transmission resource. Specifically, the license-exempt band cell needs to be compatible with all WiFi settings. Therefore, in setting the radio resources of the license-exempted band cell, configuration information can be transmitted to set a co-existence with a WiFi in the corresponding frequency band. Thus, coexistence with WiFi in the corresponding frequency band can be performed. If there is a WiFi setting that is introduced only in a specific frequency band, configuration information that allows coexistence in accordance with WiFi in the corresponding frequency band is transmitted, so that coexistence with WiFi in the corresponding frequency band can be maintained.

For example, in order to maintain coexistence with a WLAN using an OFDM scheme, a length of time resources of 6.016 ms, 3.008 ms, or 1.504 ms, which is the maximum occupied time resource, can be set to guarantee WiFi transmission. In the case of maintaining the radio frame structure of 10 ms in the mobile communication system, it is necessary to maintain 3.984 ms, 6.992 ms, or 8.496 ms remaining for guaranteeing WiFi transmission and radio resources for transmitting the mobile communication system in the license- .

As another example, when a resource smaller than 1 ms subframe unit used in the mobile communication system is set, resource setting can be performed using a flexible subframe structure such as DwPTS defined in the LTE system. That is, in order to coexist with the WiFi system, it may be necessary to adjust the number of OFDM symbols in one subframe, so that the subframe can perform resource setting using the DwPTS structure.

As another example, in setting the radio resource for coexistence with the WLAN, there may occur a problem that the WLAN and the mobile communication system overlap in a certain time interval in order to maintain the maximum occupation time of the WLAN and the frame structure of the mobile communication system. That is, in consideration of the CP (Cyclic Prefix) length in the mobile communication system, overlapping portions may occur in time units of the license-exempt band cell with some WiFi. However, considering that the introduction scenario of the license-exempt band cell is mainly a small cell, even if there is a signal that can be received in the CP of the mobile communication system frame, The transmission resources in the license-exempt band cell may be set at 4 ms, 7 ms, and 8.5 ms in the license-exempt band cell. In other words, considering the LTE system constituted by the TTI unit of 1 ms for the case, 3.984 ms, 6.992 ms, or 8.496 ms, which guarantees the WiFi transmission, is used as the radio resource for the mobile communication system transmission in the license- When setting, the resource configuration can be set to 4ms, 7ms, and 8.5ms. Considering 0.016 ms, 0.008 ms, and 0.004 ms remaining in this case, the multi-path delay spread may not be large considering the cells considered in the LAA are small cells and hot spots, and 0.016 ms, 0.008 ms, and 0.004 ms The loss in the CP of the last subframe may not be large, so that it can be regarded as a method of setting a transmission resource to prevent data loss.

- How to configure the duty cycle

In this method, a license-exempted band cell is set to have a duty cycle according to various configurations, thereby distinguishing resources that the license-exempt band cell can transmit and resources that can not be transmitted by the license-exempt band cell. That is, the radio resource setting of the license-exempt band cell can be performed according to the duty cycle that can be set variously. There are various ways to make the configuration of the duty cycle, and some examples are described below in detail.

In one example, a duty cycle may be defined according to a radio frame level or a multiple radio frame level or a subframe level or multiple subframe levels. For example, a duty cycle can be defined in units of 10 ms, which is a radio frame unit. The radio resources for the license-exempt band cell can be set in the unit of the duty cycle.

As another example, a multiple duty cycle (8ms or 4ms for switching periodicity of LTE on / off time duration) of 8ms or 4ms may be defined for an on / off time duration switching period of a mobile communication system. This provides an effect of maintaining the HARQ timing used in the mobile communication system. That is, by setting the radio resources in the license-exempt band cell through the multiple duty cycle, it is possible to provide the same effect even if the timing for the HARQ retransmission operation is not separately set.

As another example, a cell-specific or terminal-specific or elementary carrier and frequency-band specific duty cycle may be configured. Specifically, since the method for coexistence of the license-exempt band cell and the WiFi may be different for each cell, the configuration may be set differently for each cell. That is, a radio resource based on a duty cycle of each cell can be set according to a cell specific duty cycle configuration method. Alternatively, WiFi that can be supported by each terminal may be different from each other, and a method for performing coexistence with WiFi may be different according to the supported terminal capability, so that the configuration can be set differently for each terminal. That is, a radio resource based on the duty cycle of each terminal can be set according to a UE-specific duty cycle configuration method. Alternatively, since the license-exempted band cell may have different frequency bands for performing coexistence with WiFi or different supporting methods according to a specific component carrier, the corresponding component carriers and frequency bands may have different configurations. You can set it differently. That is, radio resources based on each element carrier or frequency band can be set according to an element carrier specific or frequency band specific configuration method.

- A method to set three types of time and frequency resources to maintain coexistence with the wireless LAN system

For example, a dedicated license-exempt band cell usage resource section can be set up to allow the license-exempt band cell used in the LTE system, that is, the LAA (Licensed Assisted Access) system, to use. However, since the wireless LAN system can not know whether the resource is a resource for the license-exempt band cell, an interference problem may occur. Accordingly, in this case, the mobile communication system can indicate the corresponding contents to the wireless LAN system so that the transmission of the wireless LAN system can be restricted. Through this, it is possible to solve the problem that the signal of the wireless LAN system causes interference in the license-exempted band cell dedicated section.

As another example, a dedicated WLAN system utilization resource section can be set. For example, there is no way to know whether the resource is used by the wireless LAN systems in the LTE or LAA system, and there is no way to direct the wireless LAN system to the wireless LAN system. Therefore, it is possible to set the wireless resource section so that it can not transmit the license-exempt band cell, and to prevent the transmission of the license-exempt band cell from interfering with the wireless LAN system. Also, even when the LTE or LAA system can instruct the access of the wireless LAN system using the wireless resource, the resource can be set so that the unlicensed band cell can not be connected. Through this, it is possible to solve the problem that the signal of the mobile communication system causes interference in the exclusive use resource section of the wireless LAN system.

As another example, it is possible to set the interval in which the license-exempt band cell and the WLAN system access contention-based as a green resource.

By setting three types of time and frequency resources as described above in the mobile communication system, the wireless resources can be set so that the wireless LAN system and the unlicensed band cell coexist in the same frequency band. In addition, it is possible to solve the interference problem between the wireless LAN system and the license-exempt band cell.

- How to set radio resources to match HARQ timing and retransmission timing used in conventional LTE systems.

For example, in the case of the FDD frame structure, an Ack / Nack is transmitted in the (n + 4) th subframe after receiving the scheduling information grant in the nth subframe, and asynchronous retransmission timing after Ack / It is necessary to specifically define whether to synchronize or not.

For example, the resource allocation method for performing the HARQ retransmission operation may be set as follows. When the retransmission timing is set to be synchronous, a subframe having a period of 8 ms may be set as a subframe resource to be transmitted to the license-exempt band cell by a method of setting time and frequency resources. Or additional time and frequency resources having a specific offset in the 8 ms period may be allocated depending on the time and frequency resources available in the license-exempt band cell at the license-exempted band frequency.

As another example, when the retransmission timing is set to Asynchronous, there is a need for a method that allows retransmission to be performed in an unlicensed band cell even when operating asynchronously. For this, time and frequency resources can be set to a specific set of subframes from the subframe after HARQ-ACK transmission in the (n + 4) th subframe. That is, the base station may control the terminal so that retransmission can be performed using one subframe of the corresponding subframe set.

On the other hand, a method of setting resources so that periodic transmission can be performed depending on how retransmission timing is set may be considered.

For example, a method of setting resources so that periodic transmission in units of radio frames is possible can be considered.

As another example, it is possible to set resources so that periodic transmission is possible in units of multiple radio frames.

As another example, a resource may be set to enable periodic transmission within one radio frame unit. For example, periodic transmission of one radio frame unit or successive radio frame units may not be guaranteed in that there is an unusable interval of the license-exempt band cell. Therefore, it is also possible to set resources so that periodic transmission is possible within one radio frame unit.

As described above, the terminal and the base station of the present invention can perform a data transmission / reception operation through the license-exempt band cell according to the radio resource setting method in the license-exempt band cell. The radio resource setting method in the unlicensed band cell of each of the above-described embodiments may be applied to any one embodiment, or two or more embodiments may be applied mutually.

Hereinafter, the operation of the base station in connection with the radio resource setting method of the unlicensed band cell will be described with reference to the drawings.

15 is a view for explaining a base station operation according to another embodiment of the present invention.

The base station according to another embodiment of the present invention includes setting up carrier merging or dual connectivity using the license-exempt band cell and the license band cell, and transmitting and receiving data based on the radio resource allocation in the license-exempt band cell . Here, the license-exempt band cell means a cell using a frequency band shared by one or more communication systems.

Referring to FIG. 15, the base station of the present invention includes a step of setting a merger of carriers or dual connectivity using a license-exempt band cell and a license band cell (S1510). For example, the base station may establish a carrier merge or dual connectivity with one or more license-exempt band cells to the terminal. In addition, the base station may be configured to include more than one licensed band cell in setting up carrier merging or dual connectivity.

The base station includes transmitting and receiving data based on the radio resource allocation in the license-exempt band cell (S1520). The base station can transmit and receive data to and from the terminal using the license-exempt band cell according to the radio resource allocation method defined according to each of the above embodiments. Specifically, the radio resource allocation in the license-exempt band cell can be allocated in units of a slot, a sub-frame, or a multiple sub-frame unit. Or the radio resources in the license-exempt band cell may be allocated according to the frequency band of the license-exempt band cell. In this case, the radio resources may be allocated in units of time calculated as one element of the maximum occupancy time information of the other communication system sharing the frequency band of the license-exempt band cell. Alternatively, the radio resources in the license-exempt band cell can be allocated based on a duty cycle configuration that is classified according to the frequency band of the license-exempt band cell, the terminal, or the license-exempt band cell. Alternatively, the frequency band of the license-exempted band cell may be set on the time axis for the mobile communication system exclusive use, the wireless LAN system exclusive use, or the mobile communication system and the wireless LAN system shared section. Or the radio resources in the license-exempt band cell may be allocated to a period or a sub-frame set determined based on the data retransmission timing in accordance with the HARQ retransmission operation.

In addition, radio resources in the license-exempt band cell can be allocated according to the combinations of the embodiments and the embodiments described above.

16 is a view for explaining a base station operation according to another embodiment of the present invention.

Referring to FIG. 16, the base station includes a step of setting merger or dual connectivity using the license-exempt band cell and the license band cell (S1610). For example, the base station may establish a carrier merge or dual connectivity with one or more license-exempt band cells to the terminal. In addition, the base station may be configured to include more than one licensed band cell in setting up carrier merging or dual connectivity.

When a radio resource in a license-exempted band cell is set in units of multiple subframes, the base station measures channel state measurement information measured in each subframe unit based on a reference signal transmitted in each of two or more subframes constituting a multiple subframe (Step S1620). The average information or the average of the weights may be received in a plurality of subframes. For example, the base station receives measured CSI information based on a reference signal transmitted in units of subframes, and the CSI information is an average value of a plurality of subframes for channel state measurement information measured in each subframe unit have. Or the CSI information may be a weighted average value of multiple subframes for channel state measurement information measured in each subframe unit. That is, it may be a value obtained by applying a weight to the CSI information measured for each subframe according to the weight setting and averaging the weighted value.

The base station includes transmitting and receiving data based on the radio resource allocation in the license-exempt band cell (S1630). The base station can transmit and receive data to and from the terminal using the license-exempt band cell according to the radio resource allocation method defined according to each of the above embodiments.

License-exempt band  For cell downlink data transmission HARQ - ACK  And retransmission method

As described above, since the license-exempt band cell uses a frequency band shared by a plurality of communication systems, an unusable interval may exist. Therefore, data retransmission according to the HARQ timing can not be guaranteed. In order to solve such a problem, it is necessary to define a specific timing or a retransmission operation method for the HARQ retransmission operation in the license-exempt band cell.

17 is a diagram for explaining a UE operation for HARQ retransmission according to the present invention.

Referring to FIG. 17, the terminal of the present invention may include monitoring the reception of data in the license-exempt band cell by configuring a carrier merging using the license-exempt band cell and the license band cell (S1710). A license-exempt band cell may refer to a cell using a frequency band shared by one or more communication systems. The terminal can monitor to check downlink data received in the license-exempt band cell.

When downlink data is normally received in the license-exempted band cell, the UE can transmit an Ack for the received downlink data to the base station (S1720). For example, the UE can transmit an Ack for the received downlink data to the BS through the PCell of the license band, the SCell of the license band, or the SCell having the UL grantable resource among the license-exempt band cells.

Similarly, if the downlink data is not normally received in the unlicensed band cell, the terminal can transmit Nack to the base station that the downlink data is not received (S1720). For example, the UE may transmit a Nack indicating that downlink data has not been received to the BS through the PCell in the license band, the SCell in the license band, or the SCELL with the UL grant available among the license-exempt band cells. In this case, the UE needs to perform monitoring for receiving downlink data to be retransmitted in accordance with the HARQ retransmission procedure.

Meanwhile, the UE of the present invention may include receiving scheduling information for monitoring data retransmitted in a license band cell when the UE fails to receive data (S1730). The scheduling information may indicate information indicating that data to be scheduled is data that fails to be received in the license-exempt band cell.

For example, the information to be displayed may be a value set in advance to indicate that the data among the values of the Carrier Indication field is data that failed to be received in the license-exempt band cell. As another example, the information to be displayed may be a value of a Carrier Indicator field indicating a license-exempt band cell. In addition, the terminal may further include confirming that the data is data that has failed to be received in the license-exempt band cell, based on the scheduling information and the available subframe information of the license-exempt band cell.

The terminal can receive the downlink data that failed to be received in the license-exempt band cell in the license band cell. Accordingly, data QoS according to the HARQ retransmission procedure of the conventional LTE system can be guaranteed. Also, even if there is an unavailable interval in the license-exempt band cell, the HARQ retransmission operation can be performed to perform reliable data transmission / reception.

Hereinafter, a specific embodiment of the HARQ operation of the present invention will be described below.

In retransmission according to HARQ-ACK / NACK of a license-exempt band cell, it is impossible to continuously retransmit in a license-exempt band cell. Therefore, it is possible to set up the downlink data transmission transmitted to the license-exempt band cell to be transmitted in the PCell or SCell cell using the license band cell. In addition, when a retransmission operation of data transmitted and received in the license-exempt band-pass cell is performed in the licensed band PCell or SCell, it is necessary to distinguish it from the transfer of the PCell or SCell data used in the conventional license band cell. Hereinafter, an embodiment that explicitly or implicitly indicates distinction is specifically described in this embodiment.

- How to direct implicitly

For example, the UE can receive scheduling information from the BS to receive retransmission data according to an HARQ retransmission procedure. The scheduling information may include information for indicating that the downlink data is retransmission data due to data reception failure in the unlicensed band cell. Specifically, when a carrier indicator field (CIF) to be used is configured at the time of merging a carrier, retransmission data of a license-exempt band cell can be displayed using a field value not used in the CIF. That is, a field not used in the CIF can be used as an indicator for indicating retransmission data of the license-exempt band cell. For example, current carrier merging techniques are set up to merge only up to five component carriers in the UE's context. Therefore, there is a bit combination that is not used for actual cross carrier scheduling among the states that can be represented by 3-bit CIFs. That is, 3 bits can indicate 8 states, but since the current carrier merging considers a maximum of 5 elementary carriers, there are three values that indicate five elementary carriers. Accordingly, the three values can be used as a value for indicating retransmission of the license-exempt band cell constituting the terminal. The terminal can recognize that the corresponding data is data for retransmission of the license-exempt band cell using the information set by the base station. On the other hand, when explicitly instructing using the unused value of the CIF, it is possible to set up to three license-exempt band cells.

In another example, the base station and the terminal may be configured to know information about available subframes in the license-exempt band cell. In this case, when the scheduling information (grant) is informed by retransmission except for the initial transmission, the base station can set the CIF value indicating the license-exempt band cell to be used as a value for indicating retransmission for the license-unlicensed band cell. The UE can recognize that the corresponding data is data for retransmission of the license-exempt band cell by using the information set by the corresponding base station, and obtain the gain according to the HARQ retransmission.

As another example, it is possible to use unused code-points or information fields of any information field used for scheduling information for retransmission data to be transmitted to a license-exempt band cell. The base station can implicitly set it through a combination. The UE can recognize that the corresponding data is data for retransmission of the license-exempt band cell by using the information set by the corresponding base station, and obtain the gain according to the HARQ retransmission.

According to the embodiments described above, the base station can recognize that the data received through the license band cell is the retransmission data transmitted from the license-exempt band cell.

- Explicit instructions

The base station may transmit to the terminal a scheduling information (grant) indicating retransmission, including an indicator indicating the retransmission of the license-exempt band cell. The bit size for which the indicator can be used can be set to 1 bit and can be set to distinguish whether it is a license band cell or a license-exempt band cell using 1 bit. Or the bit size at which the indicator can be used can be set to multiple bits. In this case, since a plurality of cells may be merged as a license-exempt band cell, the plurality of license-exclusion band cells may be set to be distinguishable.

A case where the UE receives the retransmission data according to the HARQ retransmission procedure in the license band cell will be described with reference to the drawings.

18 is a view for explaining a base station operation for HARQ retransmission according to the present invention.

Referring to FIG. 18, a base station according to another embodiment of the present invention may include transmitting data in an unlicensed band cell when carrier merging is configured using an unlicensed band cell and a licensed band cell (S 1810) . The base station can configure and merge carriers into the terminal. Carrier merging may consist of one or more license band cells and one or more license-exempt band cells. The base station can transmit downlink data to the terminal using the license-exempt band cell. In this regard, the UE can perform an HARQ ACK / NACK operation indicating normal reception of downlink data.

When the UE fails to receive the data, the BS receives the NACK through the PCell of the license band, the SCell of the license band, or the SCell having the UL-available resource among the license-exempt band cells, and transmits the NACK to the data to be retransmitted (Step S1820). If the terminal does not normally receive the downlink data in the unlicensed band cell transmitted by the base station, the base station can retransmit the downlink data to the terminal. In this case, the base station can transmit the retransmission data using the licensed band cell. In addition, the base station can transmit the scheduling information of the retransmission data to the mobile station. At this time, the terminal needs to know that the data received in the license band cell is the data retransmitted from the downlink data of the license-exempt band cell. Therefore, the base station can transmit the information for indicating the information to the terminal by including it in the scheduling information.

The indication information that the base station includes in the scheduling information may be implicitly or explicitly included according to each of the embodiments described above. That is, as described above, the unused value of the CIF field can be set and used. Or may combine the available or unavailable subframe information of the license-exempted band cell with the CIF value to allow the terminal to recognize it. Alternatively, the display information may be transmitted using an unused code or information field that may be included in the scheduling information. Or in an explicit manner, corresponding scheduling information Or it may indicate that the data in the licensed band cell is about retransmission data.

As described above, according to the present invention, the rate of data transmission / reception can be improved by applying the mobile communication system technology using the license-exempt band. In addition, QoS for data transmitted and received in a license-exempt band cell can be ensured, thereby ensuring reliability of data. In addition, the user experience can be improved by reliably transmitting offloading of data due to data explosion to a license-exempt band cell.

On the other hand, it is possible to prevent the occurrence of operational ambiguity with a large number of communication systems in the license-exempted band and to reduce the interference with other signals, thereby stably handling large-capacity high-speed data.

The configuration of a terminal and a base station to which all of the present invention can be performed will be described once more with reference to the drawings.

19 is a diagram for explaining a terminal configuration according to another embodiment of the present invention.

Referring to FIG. 19, a user terminal 1900 according to another embodiment of the present invention includes a control unit 1910 that forms a carrier merging or dual connectivity using a license-exempt band cell and a license band cell, And a receiving unit 1930 for receiving data based on the radio resource allocation in the license-exempt band cell.

The control unit 1910 can configure the carrier merging using the license band cell and the license-exempt band cell according to the setting of the base station. Or the control unit 1910 may configure the dual connectivity using the license band cell and the license-exclusion band cell. The license band cell and the license-exempt band cell constituting the carrier merging or dual connectivity may each be one or more. In addition, the control unit 1910 can control the overall configuration of the terminal 1900 for performing the above-described present invention.

The transmitter 1920 can transmit HARQ ACK / NACK for the uplink data and the downlink data to the base station based on the radio resource allocation in the license-exempt band cell. The receiving unit 1930 can receive the downlink data based on the radio resource allocation in the license-exempt band cell.

In addition, the radio resources of the license-exempt band cell can be set as in each of the above-described embodiments. For example, radio resources in a license-exempt band cell may be allocated on a slot-by-slot basis.

As another example, the radio resources in the license-exempt band cell may be allocated on a sub-frame basis or on a multiple sub-frame basis. Specifically, the radio resources in the license-exempt band cell may be allocated in units of 0.5 ms, or in units of sub-frames of 1 ms or units of 2 ms or more.

As another example, the radio resources in the license-exempt band cell may be allocated according to the frequency band of the license-exempt band cell. For example, different radio resource allocation schemes may be used depending on the frequency band used by each license-exempt band cell. In other words, the radio resources may be allocated in a predetermined time unit calculated by taking the maximum occupation time of another communication system such as WiFi sharing the frequency band of the license-exempted band cell as one element.

As another example, the radio resources in the license-exempt band cell may be allocated based on a duty cycle configuration that is classified according to the frequency band of the license-exempt band cell, the terminal, or the license-exempt band cell. Different wireless resource allocation schemes may be applied based on the duty cycle in that different duty cycles may be configured for each of the license-exempt band cells or for each terminal or for each frequency band of the license-exempt band cell.

As another example, the time and frequency resources of the license-exempted band cell may include time and frequency resources set only on the time axis for use only by a mobile communication system (e.g., LAA system), time and frequency resources And a time and frequency resource section set so that the mobile communication system and the wireless LAN system can share the same. In a section shared by the mobile communication system and the wireless LAN system, each communication system may use the corresponding wireless resource based on competition.

As another example, the radio resources in the license-exempt band cell may be allocated to a period or a subframe set that is determined based on the data retransmission timing in accordance with the HARQ retransmission operation. For example, in data transmission / reception between a base station and a mobile station, a radio resource allocation period or the like may be set so that data retransmission can be performed in consideration of HARQ retransmission timing for ensuring data transmission / reception quality.

On the other hand, in connection with the HARQ retransmission procedure, the control unit 1910 can configure the carrier merging using the license-exempt band cell and the license band cell, in connection with the HARQ procedure, to monitor the reception of data in the license-exempt band cell. Also, in connection with the HARQ retransmission procedure, the receiving unit 1930 may receive scheduling information for monitoring the data retransmitted in the licensed band cell when the receiving of the data fails. The scheduling information may include information indicating that the data received in the license band cell is retransmission data for the data that failed to be received in the unlicensed band cell. As with each of the embodiments described above, the information to be displayed can be indicated in an explicit or implicit manner. Also, the transmitter 1920 can transmit an Ack for the received downlink data to the base station. For example, the transmitter 1920 can transmit an Ack for the received downlink data to the base station through the PCell of the license band, the SCell of the license band, or the SCELL with the UL-usable resource among the license-exempt band cells.

Similarly, the transmitter 1920 can transmit Nack to the base station that the corresponding downlink data is not received. For example, the transmitter 1920 may transmit Nack indicating that downlink data has not been received to the BS through the PCell of the license band, the SCell of the license band, or the SCELL with the UL grant available among the license-exempt band cells.

20 is a view for explaining a base station configuration according to another embodiment of the present invention.

Referring to FIG. 20, a base station 2000 according to another embodiment includes a control unit 2010 for setting a carrier merging or dual connectivity using a license-exempt band cell and a license band cell, A transmitter 2020 for transmitting data and a receiver 2030 for receiving data based on radio resource allocation in an unlicensed band cell.

The control unit 2010 can be configured to configure the carrier merging in the terminal. Carrier merging may consist of one or more license band cells and one or more license-exempt band cells. In addition, the control unit 2010 can control the overall operation of the base station 2000 in performing each of the embodiments of the present invention described above.

The transmitter 2020 can transmit data to the terminal based on the radio resource allocation in the license-exempt band cell. Also, the receiving unit 2030 can receive the uplink data based on the radio resource allocation in the license-exempt band cell. In addition, the transmitting unit 2020 and the receiving unit 2030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

As described above, the radio resources of the license-exempt band cell can be set in various ways, and the control unit 2010, the transmission unit 2020, and the reception unit 2030 perform the operations of the present invention according to the radio resource setting method can do.

Meanwhile, the control unit 2010 may control the base station operation for transmitting data to the mobile station and for transmitting scheduling information in the HARQ retransmission operation.

The transmitting unit 2020 transmits the downlink data using the license-exempt band cell to the UE, and can transmit the retransmission data according to the HARQ retransmission through the license band cell. As described above, the scheduling information may include information indicating that the scheduling information or the downlink data is retransmission of data that failed to be transmitted in the unlicensed band cell. Specifically, the information to be displayed can be transmitted to the terminal in an implicit method or an explicit manner as in the above-described embodiments.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (24)

A method of transmitting and receiving data in a terminal,
Constructing a carrier merging or dual connectivity using a license-exempt band cell and a licensed band cell; And
And transmitting and receiving data based on radio resource allocation in the license-exempt band cell,
Wherein the license-exempt band cell is a cell using a frequency band shared by one or more communication systems. The method according to claim 1,
Wherein the radio resource in the license-
A slot unit, a sub-frame unit, and a multi-sub-frame unit. The method according to claim 1,
Wherein the radio resource in the license-
The frequency band of the license-exempt band cell is divided and allocated,
Wherein the maximum occupancy time of the other communication system sharing the frequency band of the license-exempt band cell is allocated in units of a predetermined time calculated as one element. The method according to claim 1,
Wherein the radio resource in the license-
Wherein each of the frequency bands is allocated based on a duty cycle configuration that is classified into frequency bands of the license-exempt band cell, the terminal, and the license-exempt band cell. The method according to claim 1,
The frequency band of the license-
Wherein the mobile station is divided into a mobile communication system exclusive, a wireless LAN system exclusive, or a mobile communication system and a wireless LAN system shared section on a time axis. The method according to claim 1,
Wherein the radio resource in the license-
And is allocated to a period or subframe set determined based on a data retransmission timing in accordance with an HARQ retransmission operation. A method of transmitting and receiving data in a base station,
Establishing a carrier merge or dual connectivity using a license-exempt band cell and a licensed band cell; And
And transmitting and receiving data based on radio resource allocation in the license-exempt band cell,
Wherein the license-exempt band cell is a cell using a frequency band shared by one or more communication systems. 8. The method of claim 7,
Wherein the radio resource in the license-
A slot unit, a sub-frame unit, and a multi-sub-frame unit. 8. The method of claim 7,
Wherein the radio resource in the license-
The frequency band of the license-exempt band cell is divided and allocated,
Wherein the maximum occupancy time of the other communication system sharing the frequency band of the license-exempt band cell is allocated in units of a predetermined time calculated as one element. 8. The method of claim 7,
Wherein the radio resource in the license-
Wherein each of the frequency bands is allocated based on a duty cycle configuration that is classified into frequency bands of the license-exempt band cell, the terminal, and the license-exempt band cell. 8. The method of claim 7,
The frequency band of the license-
Wherein the mobile station is divided into a mobile communication system exclusive, a wireless LAN system exclusive, or a mobile communication system and a wireless LAN system shared section on a time axis. 8. The method of claim 7,
Wherein the radio resource in the license-
And is allocated to a period or subframe set determined based on a data retransmission timing in accordance with an HARQ retransmission operation. A terminal for transmitting and receiving data,
A control unit configured to merge the carriers or configure the dual connectivity using the license-exempt band cell and the license band cell;
A transmitter for transmitting data based on a radio resource allocation in the license-exempt band cell; And
And a receiver for receiving data based on radio resource allocation in the license-exempt band cell,
Wherein the license-exempt band cell is a cell using a frequency band shared by one or more communication systems. 14. The method of claim 13,
Wherein the radio resource in the license-
A slot unit, a sub-frame unit, and a multiple sub-frame unit. 14. The method of claim 13,
Wherein the radio resource in the license-
The frequency band of the license-exempt band cell is divided and allocated,
Wherein the maximum occupancy time of the other communication system sharing the frequency band of the license-exempt band cell is allocated in units of a predetermined time calculated as one element. 14. The method of claim 13,
Wherein the radio resource in the license-
Wherein the terminal is allocated based on a duty cycle configuration that is divided into frequency bands of the license-exempt band cell, the terminal, and the frequency band of the license-exempt band cell. 14. The method of claim 13,
The frequency band of the license-
Wherein the mobile terminal is divided into a mobile communication system dedicated, a wireless LAN system dedicated, or a mobile communication system and a wireless LAN system shared section on a time axis. 14. The method of claim 13,
Wherein the radio resource in the license-
And the HARQ retransmission operation is allocated to a period or subframe set determined based on a data retransmission timing according to an HARQ retransmission operation. A base station for transmitting and receiving data,
A control unit for setting a carrier merging or dual connectivity using the license-exempt band cell and the license band cell;
A transmitter for transmitting data based on a radio resource allocation in the license-exempt band cell; And
And a receiver for receiving data based on radio resource allocation in the license-exempt band cell,
Wherein the license-exempt band cell is a cell using a frequency band shared by one or more communication systems. 20. The method of claim 19,
Wherein the radio resource in the license-
A slot unit, a sub-frame unit, and a multiple sub-frame unit. 20. The method of claim 19,
Wherein the radio resource in the license-
The frequency band of the license-exempt band cell is divided and allocated,
Wherein the maximum occupancy time of the other communication system sharing the frequency band of the license-exempted band cell is allocated in units of a predetermined time calculated as one element. 20. The method of claim 19,
Wherein the radio resource in the license-
Wherein the base station is allocated based on a duty cycle configuration classified by frequency bands of the license-exempt band cell, the terminal, and the frequency band of the license-exempt band cell. 20. The method of claim 19,
The frequency band of the license-
Wherein the mobile station is divided into a dedicated mobile communication system, a dedicated wireless LAN system, a mobile communication system and a wireless LAN system shared section on a time axis. 20. The method of claim 19,
Wherein the radio resource in the license-
And is allocated to a period or subframe set determined based on a data retransmission timing according to an HARQ retransmission operation.

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