WO2016010277A1 - Data transmission/reception method using unlicensed spectrum cell and device therefor - Google Patents

Abstract

The present invention relates to a method for transmitting/receiving data by a terminal and, more specifically, to a specific method and device for transmitting/receiving data using an unlicensed spectrum cell. Further, the present invention relates to a method for configuring a resource for a cell and, more specifically, to a resource configuration method and device for using an unlicensed spectrum cell.

Description

Method and apparatus for transmitting / receiving data using unlicensed band cell

The present invention relates to a method for transmitting and receiving data of a terminal, and more particularly, to a specific method and apparatus for transmitting and receiving data using an unlicensed spectrum cell.

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

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data beyond voice-oriented services. The development of technology capable of transferring large amounts of data is required. As a method for transmitting a large amount of data, data can be efficiently transmitted using a plurality of cells.

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

In addition, a discussion on dual connectivity for communicating with a terminal using such a small cell and a conventional macro cell is in progress. In this dual connectivity situation, the terminal may perform wireless communication with a plurality of base stations.

Meanwhile, the necessity of using a frequency band shared with a plurality of communication systems is increasing. This is due to the lack of the frequency band used in the mobile communication system and the need for large data processing, and researches on a method for using the shared frequency and the unlicensed band used by the Wi-Fi system in the mobile communication system are in progress.

The present invention devised in the above-described situation is to propose a specific method and apparatus for transmitting and receiving data using a frequency band that the terminal can be shared by the same communication system operated by another communication system or another operator.

In addition, the present invention is to propose a specific procedure and channel measurement method when the terminal and the base station performs dual connectivity or carrier aggregation using an unlicensed band cell.

According to an aspect of the present invention, there is provided a method for transmitting and receiving data in a terminal, the method comprising: receiving a reference signal for RRM (radio resource management) measurement and channel measurement of an unlicensed band cell and an unlicensed band measured based on the reference signal Transmitting the RRM measurement result and the channel quality measurement result of the cell, and controlling data transmission / reception if the unlicensed band cell is configured as a secondary cell, wherein the unlicensed band cell is a cell using a frequency band shared by one or more communication systems. Provide a method.

In addition, the present invention provides a method for transmitting and receiving data in the base station, the step of transmitting a reference signal for the RRM measurement and channel measurement of the unlicensed band cell and the RRM measurement result and channel quality of the unlicensed band cell measured based on the reference signal Receiving a measurement result and configuring the unlicensed band cell as a secondary cell based on the RRM measurement result and the channel quality measurement result, wherein the unlicensed band cell is a cell using a frequency band shared by one or more communication systems. to provide.

In addition, the present invention is a terminal for transmitting and receiving data, the RRM measurement result of the unlicensed band cell and the RRM measurement result and the channel quality measurement result of the unlicensed band cell measured based on the reference signal for receiving the reference signal for channel measurement When the transmitter and the unlicensed band cell for transmitting a secondary cell includes a control unit for controlling data transmission and reception operations, the unlicensed band cell provides a terminal device that is a cell using a frequency band shared by one or more communication systems.

In addition, the present invention is a base station for transmitting and receiving data, the RRM measurement of the unlicensed band cell and the RRM measurement result and channel quality measurement result of the unlicensed band cell measured based on the reference signal for transmitting the reference signal for channel measurement And a control unit configured to configure an unlicensed band cell as a secondary cell based on a reception unit for receiving a RRM measurement result and a channel quality measurement result, wherein the unlicensed band cell is a cell using a frequency band shared by one or more communication systems. do.

In addition, the present invention provides a method for transmitting and receiving data in a terminal, comprising the steps of configuring a carrier merge or dual connectivity using an unlicensed band cell and a licensed band cell, and transmitting and receiving data based on radio resource allocation in an unlicensed band cell. It provides a method to include.

In addition, the present invention provides a method for transmitting and receiving data in a base station, comprising the steps of establishing a carrier merge or dual connectivity using an unlicensed band cell and a licensed band cell, and transmitting and receiving data based on radio resource allocation in an unlicensed band cell. It provides a method to include.

In addition, the present invention provides a control unit that configures carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell, and a radio resource allocation in a transmitter and an unlicensed band cell that transmit data based on radio resource allocation in an unlicensed band cell. It provides a terminal device including a receiving unit for receiving data based on. .

In addition, the present invention provides a control unit for configuring carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell, and a radio unit for transmitting data based on radio resource allocation in an unlicensed band cell and radio resource allocation in an unlicensed band cell. It provides a base station apparatus including a receiving unit for receiving data based on.

In addition, the present invention configures carrier aggregation using an unlicensed band cell and a licensed band cell to monitor data reception in an unlicensed band cell and to receive data retransmitted in the licensed band cell when the reception of the data fails. Receiving scheduling information for monitoring, wherein the scheduling information provides a terminal method including information indicating that the data failed to receive data in the unlicensed band cell.

In addition, the present invention provides a method for transmitting data in an unlicensed band cell when carrier aggregation is configured using an unlicensed band cell and a licensed band cell, and for data retransmitted in a licensed band cell when a terminal fails to receive data. And transmitting the scheduling information, wherein the scheduling information includes information indicating that the data has failed to be received in the unlicensed band cell.

In addition, the present invention configures a carrier aggregation using an unlicensed band cell and a licensed band cell, and controls the reception of the data in the unlicensed band cell and the data retransmitted in the licensed band cell when the reception of the data fails. It includes a receiving unit for receiving the scheduling information for monitoring, the scheduling information provides a terminal device including information indicating that the data failed reception in the unlicensed band cell.

In addition, the present invention transmits data in the control unit and the unlicensed band cell constituting carrier aggregation by using the unlicensed band cell and the licensed band cell to the terminal, when the terminal fails to receive data, the data is retransmitted in the licensed band cell It includes a transmitter for transmitting the scheduling information for, the scheduling information provides a base station apparatus including information indicating that the data failed to receive data in the unlicensed band cell.

As described above, by transmitting and receiving data using an unlicensed band cell, it is possible to process a large amount of data at a high speed.

In addition, the present invention provides a specific procedure in configuring an unlicensed band cell to dual connectivity or carrier aggregation, thereby providing an effect of preventing ambiguity of UE and base station operations.

1 is a diagram illustrating small cell deployment according to an embodiment.

2 is a diagram illustrating a small cell deployment scenario.

3 to 6 show detailed scenarios in small cell deployment.

7 is a diagram illustrating various scenarios of carrier aggregation.

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

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

10 is a diagram illustrating another example of a dual connectivity structure.

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

12 is a diagram for explaining an unlicensed band cell.

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

14 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.

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

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

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

18 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.

19 is a view for explaining a terminal operation for HARQ retransmission of the present invention.

20 is a view for explaining the operation of a base station for HARQ retransmission of the present invention.

21 is a diagram illustrating a terminal configuration according to another embodiment of the present invention.

22 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a 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, an Sector, a Site, and a BTS. Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.

In other words, in the present specification, a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, and the like, according to the configuration of the radio region, become an embodiment of the base station. In ii), the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.

Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques 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, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in systems such as LTE and LTE-Advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like. Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

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

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

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

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.

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

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.'

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.

In addition, for convenience of description, the EPDCCH, which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

The following describes a small cell deployment scenario to which the proposals described in the present invention are applicable.

1 is a diagram illustrating small cell deployment according to an embodiment.

FIG. 1 illustrates a configuration in which a small cell and a macro cell coexist, and in FIGS. 2 to 3 below, whether macro coverage is present and whether the small cell is for outdoor or indoor. In order to determine whether the small cell is sparse or dense, the deployment of the small cell is divided in more detail according to whether or not to use the same frequency spectrum as the macro in terms of spectrum.

2 is a diagram illustrating a small cell deployment scenario. FIG. 2 shows a typical representative configuration for the scenario of FIG. 3. 2 illustrates a small cell deployment scenario and includes scenarios # 1, # 2a, # 2b and # 3. 200 denotes a macro cell, and 210 and 220 denote small cells. In FIG. 2, the overlapping macro cell may or may not exist. Coordination may be performed between the macro cell 200 and the small cells 210 and 220, and coordination may also be performed between the small cells 210 and 220. The overlapped areas of 200, 210, and 220 may be bundled into clusters.

3 to 6 show detailed scenarios in small cell deployment.

3 shows scenario # 1 in small cell deployment. Scenario 1 is a co-channel deployment scenario of a small cell and a macro cell in the presence of an overhead macro and an outdoor small cell scenario. 3 illustrates a case in which both the macro cell 311 and the small cell are outdoors, and 312 indicates a small cell cluster. Users are distributed both indoors and outdoors.

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

4 illustrates small cell deployment scenario # 2a. Scenario 2a is an deployment scenario in which the small cell and the macro use different frequency spectrums in the presence of an overlay macro and an outdoor small cell scenario. Both macro cell 411 and small cells are outdoors and 412 indicates a small cell cluster. Users are distributed both indoors and outdoors.

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

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

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

6 illustrates small cell deployment scenario # 3. Scenario 3 is an indoor small cell scenario in the absence of coverage of macros. 612 indicates a small cell cluster. In addition, small cells are all indoors, and users are distributed both indoors and outdoors.

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

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

7 is a diagram illustrating various scenarios of carrier aggregation.

As shown in FIG. 7, the corresponding F1 and F2 may be frequencies supporting the same duplex mode, or the frequencies supporting different duplex modes may be considered.

In 710, F1 and F2 cells are co-located and overlapped under almost the same coverage. Two layers are scenarios that provide sufficient coverage and mobility, and scenarios in which aggregation between overlapped F1 and F2 cells are possible.

720 is a scenario in which F1 and F2 cells co-locate and overlap, but the coverage of F2 is smaller than that of F1. F1 has sufficient coverage, mobility support is performed based on F1 coverage, and F2 is a scenario used for improving throughput, and a scenario in which overlapping F1 and F2 cells are merged is possible.

730 is a scenario in which F1 and F2 cells co-locate, but F2 antennas are directed to the cell edge to increase cell edge throughput. Mobility support is performed based on F1 coverage, where F1 has sufficient coverage but F2 is potentially a coverage hole, and F1 and F2 cells on the same eNB can be merged where coverage overlaps. That is the scenario.

Scenario 740 is a scenario in which F1 has macro coverage and RRH at F2 is used to improve throughput in hot spot area. Mobility support is performed based on F1 coverage and with F1 macro cell. This is a scenario in which F2 RRHs cells can be merged.

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

In case of supporting Carrier Aggregation (CA), Carrier Aggregation in FDD and TDD duplex modes is considered. Carrier Aggregation in the same duplex mode as in 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 terminal has one RRC connection with the network, and one serving cell is NAS mobility at the time of RRC connection establishment / re-establishment / handover. It provides information (NAS mobility information), and one serving cell provides security input at RRC connection re-establishment / handover. A cell providing such a function is called a primary cell (PCell). In the downlink, the carrier corresponding to the PCell is a downlink primary component carrier (DL PCC), and in the uplink, an uplink primary component carrier (UL PCC) is used.

-PCell can be changed only by handover procedure.

PCell is used for transmission of PUCCH.

Unlike SCells, PCells cannot be de-activated.

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

NAS information is obtained from PCell.

Secondary Cell (SCell)

SCells may be configured in the form of a set of serving cells together with the PCell depending on UE capability. The carrier corresponding to the SCell in 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 SCells. The number of serving cells that can be configured depends on the aggregation capability of the terminal.

Reconfiguration, addition and removal of SCells may be performed by the RRC. During intra-LTE handover, the RRC may reconfigure, add or remove SCells for use with the target PCell. Can be. When adding a new SCell, dedicated RRC signaling is used to transmit all required system information of the SCell. In the connected mode, the terminal does not need to obtain broadcast system information directly from the SCells.

Dual Connectivity

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 UE transmission rate from different nodes under dual connectivity, which is based on one or more base stations for user plane data transmission. And to merge radio resources over.

Dual connectivity refers to an operation in which an RRC connected (RRC_CONNECTED) terminal uses radio resources provided by at least two different network points (eg, master eNB and secondary eNBs) connected by non-ideal backhaul. In the dual connectivity, the master eNB refers to a base station terminating the S1-MME and acting as a mobility anchor toward a core network (CN). The master eNB may be referred to as a master base station or MeNB or Macro eNB or macrocell eNB. In the dual connectivity, the secondary base station (Secondary eNB) is a base station that provides additional radio resources for the terminal means a base station other than the master eNB. The secondary eNB may be referred to as a secondary base station or SeNB or small cell eNB or Small eNB or Assisting eNB. In this case, a group of serving cells associated with the MeNB is called a Master Cell Group (MCG), and a group of serving cells associated with the SeNB is called a Secondary Cell Group (SCG). Here, the associated serving cells may mean a serving cell provided by a corresponding base station.

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

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

9 illustrates an example of a dual connectivity structure using radio resources provided by two base stations connected by non-ideal backhaul. If the dual connectivity is configured in the terminal as shown in FIG. 9, the terminal may configure a specific data radio bearer as a specific base station-specific bearer. For example, the terminal 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. Only one base station has a PDCP entity, an RLC entity, and a MAC entity for a specific MCG data radio bearer or a specific SCG radio bearer. The terminal has an entity in the terminal peered to the entity.

10 is a diagram illustrating another example of a dual connectivity structure.

10 illustrates another example of a dual connectivity structure using radio resources provided by two base stations connected by non-ideal backhaul. When the dual connectivity is configured in the terminal as shown in FIG. 10, the terminal may split a specific data radio bearer through two base stations (MeNB and SeNB). Hereinafter, a bearer configured to be separated through two base stations is referred to as a split radio bearer (MCG-SCG radio bearer) or a split bearer. For a particular split 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, SeNB is SeNB MAC entity). The terminal has an entity in the terminal peered to the entity.

In the present specification, when the terminal configures dual connectivity, forms an RRC connection with the terminal, terminates the base station or S1-MME providing a cell (for example, a PCell) that is a reference for handover, and the mobility anchor for the core network. A base station serving as a (mobility anchor) is described as the aforementioned master base station, MeNB, or first base station as necessary.

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

Meanwhile, a base station that is distinguished from a master base station in a dual connectivity environment and provides additional radio resources to a terminal is described as a secondary base station, an SeNB, or a second base station as necessary.

The master base station and the secondary base station may each provide at least one cell to the terminal, and the master base station and the secondary base station may be connected through an interface between the master base station and the secondary base station.

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

In the present invention, the macro cell may mean each of at least one or more cells, and may be described as representing a whole cell associated with the master base station. In addition, the small cell may also mean each of at least one or more cells, and may be described as a representative of all cells associated with the secondary base station. However, as described above, in a specific scenario such as a small cell cluster, the cell 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 embodiments, for convenience of explanation, the macro cell may be associated with the master base station or the first base station, and the small cell may be associated with the secondary base station or the second base station, but the present invention is not limited thereto. A base station or a second base station may be associated with the macro cell, and the present invention also applies to a situation in which the master base station or the first base station is associated with the small cell.

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

Referring to FIG. 11, an unlicensed band cell refers to a cell using a frequency of an unlicensed spectrum or a shared spectrum. That is, the unlicensed band cell refers to a component carrier for performing LTE data transmission in an unlicensed band or a shared band using a licensed assisted access method.

Meanwhile, various scenarios may be considered as a scenario when using an unlicensed band cell as shown in FIG. 11. As an example, a scenario in which the licensed band cell and the unlicensed band cell operate in the form of carrier aggregation may be considered. As another example, a scenario may be considered in which the licensed band small cells and the unlicensed band cell are configured in a carrier aggregation form. As another example, a scenario may be considered in which a licensed band cell and an unlicensed band cell covering macro coverage constitute dual connectivity. That is, the following three scenarios can be considered.

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

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

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

In addition, the licensed band cell and the unlicensed band cell may be combined in various scenarios, and the present invention may be applied to each scenario.

12 is a diagram for explaining an unlicensed band cell.

An unlicensed band cell will be described in more detail with reference to FIG. 12. In the case of an unlicensed band cell formed by an unlicensed band frequency by one carrier, another unlicensed band cell formed by another provider or another radio access technology such as WiFi or Bluetooth (Radio Access Technology, RAT) Because it is shared with the system, the frequency band cannot be used exclusively. Accordingly, when the corresponding frequency band is available through LBT (Listen before talk), it is possible to support the terminal by configuring the unlicensed band cell through the frequency of the corresponding unlicensed band for a specific time. However, even if the unlicensed band cell is configured through the corresponding unlicensed band frequency, after a certain time, the specific frequency band must be emptied for another operator or another communication system for a specific time.

In the present invention, for convenience of understanding, as shown in FIG. 12, a time period in which an arbitrary operator forms an unlicensed band cell in an arbitrary frequency band and can support a terminal of the corresponding operator is referred to as an unlicensed band cell available period. In addition, a time period in which an unlicensed band cell cannot be configured in a corresponding frequency band is referred to as an unlicensed band cell unavailable section. However, this is also for convenience of description and the name is not limited.

As described above, the transmission and reception techniques used in the conventional LTE or LTE-Advanced are considering the use in the licensed band, and do not consider the operation in the unlicensed band.

The corresponding time and frequency resources of the licensed band could be easily used with full flexibility according to the configuration of the base station. However, since time and frequency resources in the unlicensed band can be used in different heterogeneous networks due to the nature of the unlicensed band, there may be a problem in flexibly using all time and frequency resources according to the configuration of the base station. In addition, there is a problem that it is difficult to secure the transmission and reception data when transmitting and receiving data in a manner that is used in the existing LTE or LTE-Advanced in the unlicensed band.

Accordingly, the present invention proposes a specific method for transmitting and receiving data by configuring carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell. In addition, the present invention is to propose a method for ensuring higher reliability in transmitting and receiving data in an unlicensed band cell.

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

In a method for transmitting and receiving data, a terminal according to an embodiment of the present invention, receiving a reference signal for measuring a channel of an unlicensed band cell and transmitting a channel quality measurement result of an unlicensed band cell measured based on the reference signal And if the unlicensed band cell is configured as a secondary cell, controlling the data transmission / reception operation. In this case, the unlicensed band cell refers to a cell using a frequency band shared with one or more communication systems as described above.

Referring to FIG. 13, the terminal of the present invention includes receiving a reference signal for channel measurement of an unlicensed band cell (S1310). In order to use an unlicensed band cell, a UE needs to measure a radio resource management (RRM) measurement of an unlicensed band cell, that is, a reference signal received power (RSRP) measurement, a reference signal received quality (RSRQ) measurement, or a channel quality. Accordingly, the terminal may receive a reference signal for RRM measurement and channel measurement of the unlicensed band cell. The reference signal may be received according to a transmission resource setting timing of an unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. For example, the reference signal may be received in units of 1 ms subframes according to transmission resource timing set in the unlicensed band cell. Alternatively, the reference signal may be received according to a period less than 1 ms. As another example, the reference signal may be received in units of subframe sets according to an existing positioning duty cycle or a preset period. In addition, the reference signal may be received according to various periods according to the configuration of the base station and the terminal. Meanwhile, the reference signal may include an existing reference signal such as CRS, CSI-RS or discovery RS. Alternatively, a newly defined signal may be used as the reference signal.

The terminal may include transmitting an RRM measurement result and a channel quality measurement result of the unlicensed band cell measured based on the reference signal (S1320). For example, the terminal may measure the RRM and channel quality of the unlicensed band cell using the received reference signal. The terminal may transmit the measured RRM measurement result and the channel quality measurement result to the base station. For example, the RRM measurement result and the channel quality measurement result are signal to interference ratios (Signal to Interference & Noise Ratio) in addition to RSRP and RSRQ included in the RRM measurement measured based on the reference signal, for example, SINR information and RSSI. It may include (Received Signal Strength Indicator). As another example, the channel quality measurement result may be immediately transmitted when the channel quality is measured according to the reception of the reference signal. That is, as shown in FIG. 12, since an unlicensed interval of an unlicensed band cell may occur, the terminal may immediately transmit a corresponding RRM measurement result and a channel quality measurement result when the RRM measurement and the channel quality are measured. Even in this case, the transmitted RRM measurement result and channel quality measurement result may include SINR information and RSSI as signal to noise ratios measured in addition to RSRP and RSRQ included in the RRM measurement.

Meanwhile, when the unlicensed band cell is configured as a secondary cell, the terminal may include controlling a data transmission / reception operation (S1330). The base station may configure the corresponding unlicensed band cell in the form of carrier aggregation or dual connectivity based on the RRM measurement result and the channel quality measurement result received from the terminal. When the unlicensed band cell is configured in a carrier aggregation or dual connectivity form, the terminal may transmit and receive data using the corresponding unlicensed band cell. However, in the case of an unlicensed band cell, a problem of sharing with a plurality of communication systems may occur, and thus the data transmission mode may be set differently from the conventional method. For example, the data transmission mode in the unlicensed band cell may be set according to the scheduling method of the unlicensed band cell. For example, in order to transmit data of an unlicensed band cell, it is set to a cross-carrier scheduling method for receiving scheduling information using a licensed band cell, and a transmission mode based on a demodulation reference signal (DMRS) when the cross-carrier scheduling is set. Is configured in an unlicensed band cell. Alternatively, in a case where cross-carrier scheduling and self-carrier scheduling are configured for data transmission of an unlicensed band cell, first, when a transmission scheme for data transmission of an unlicensed band cell is set to a self-carrier scheduling scheme, It may be configured in a transmission mode. Specifically, when control information including scheduling information is received through the PDCCH when the unlicensed band cell is set in the self-carrier scheduling scheme, both CRS or DMRS-based transmission modes may be configured. As another example, when the unlicensed band cell is set in a self-carrier scheduling scheme and control information is received through the EPDCCH, the unlicensed band cell may be configured in a DMRS based transmission mode only.

Hereinafter, each embodiment of the present invention will be described in more detail by dividing the RRM measurement and channel quality measurement method and the data transmission mode setting method. In addition, for convenience of understanding, assuming carrier aggregation, the same may be applied to the case of dual connectivity. That is, in the case of carrier aggregation, data and signals are transmitted and received by a single base station, but in the case of dual connectivity, data and signals described below are transmitted and received by two or more base stations. The spirit of the invention can be equally applied.

How to define specific procedures for the addition and activation of unlicensed band cells.

A terminal according to an embodiment of the present invention receives a reference signal for RRM measurement and channel measurement of an unlicensed band cell and transmits an RRM measurement result and a channel quality measurement result of an unlicensed band cell measured based on the reference signal. It may include a step. That is, the base station may receive and determine the RRM measurement result and the channel quality measurement result of the unlicensed band cell from the terminal in order to configure the unlicensed band cell in the terminal and use it for data transmission and reception. To this end, the terminal measures the RRM and channel quality of the unlicensed band cell based on the reference signal, and transmits the result to the base station.

The channel quality measurement result for the unlicensed band cell may be used as a precondition for configuring carrier aggregation or dual connectivity in the terminal, or may be used to determine whether to activate the unlicensed band cell configured in the terminal.

However, when performing activation of an unlicensed band cell additionally configured as a secondary cell (SCell) in the terminal, a SCell measurement may be performed when SCell activation conditions used in the conventional LTE technology are followed. There is a problem that the number of can be small. That is, since the number of subframes or radio resources available after using a mechanism such as List Before Talk (LBT) in an unlicensed band cell may be small, it is difficult to apply the existing LTE RRM measurement and channel measurement mechanism. This is because, as described above, by using the frequency band shared by the unlicensed band cell with a plurality of communication systems, the frequency of the unlicensed band cell may enter an unusable section after performing the LBT. Therefore, the present invention is to propose a specific method for solving the problem that can not be solved by the channel measurement mechanism of the existing LTE system.

As an example, considering that the reference signal for channel measurement in the existing New Carrier Type (NCT) was transmitted with a CRS port 0 with a period of 5 ms, the requirement for RRM measurement could be satisfied. In order to perform a corresponding RRM measurement for cell transmission, transmission of CRS port 0 having a 5 ms period may be considered.

As another example, since an unlicensed band cell may not be able to guarantee transmission having a period of 5 ms, a reference signal for transmitting an RRM measurement in a time unit smaller than 1 ms or 1 ms may be transmitted. In more detail, short time unit reference signal transmission such as Positioning Reference Signal (PRS) transmission may be considered.

As another example, when a transmission cycle of an unlicensed band cell is configured in a duty cycle, a predetermined period, or a specific subframe set, resources for RRM measurement may be limited to available subframe resources. Accordingly, the channel measurement may be set based on a duty cycle or a reference signal transmitted in a specific cycle or a specific subframe set. That is, for the unlicensed band cell, the RRM measurement may be performed based on the CRS, CSI-RS, or discovery RS transmitted in the available subframe resource, and the reporting may be immediately transmitted. In this case, the channel quality measurement result may be transmitted every subframe unit so that the base station controls the SCell addition or activation operation based on the RRM measurement result of the corresponding unlicensed band cell.

As another example, in an unlicensed band cell, a frequency band is shared and used by a plurality of communication systems, and thus continuous resource usage cannot be guaranteed. Therefore, when the RRM measurement result and the channel measurement result are transmitted in the unlicensed band cell at intervals in the conventional communication method, the RRM measurement result and the channel measurement result may not be properly transmitted. In order to solve this problem, in the present invention, in addition to the RSRP and RSRQ included in the RRM measurement in the corresponding subframe in the instant unlicensed band cell, the signal to noise ratio (Signal to Interference & Noise Ratio), for example SINR information and RSSI (Received 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 transmits to the RSRP and RSRQ included in the received RRM measurement. In addition, it may be defined to determine whether to add or activate an SCell based on SINR information and RSSI. In detail, as a method for measuring SINR and RSSI, CRS may be used as a reference signal that has been used. For example, it may be configured to measure SINR and RSSI using CRS port 0 or CRS port 1 or both. As another example, as a method for measuring SINR and RSSI, the CSI-RS may be used as a reference signal that has been used. In more detail, SINR and RSSI may be measured using zero power CSI-RS and non-zero power CSI-RS.

Scheduling method for unlicensed band cell and transmission mode setting method

When the unlicensed band cell is additionally configured as an SCell in the terminal, the unlicensed band cell may be configured by cross-carrier scheduling or self-carrier scheduling. Cross-carrier scheduling refers to a method of delivering scheduling information for one cell through another cell, and self-carrier scheduling refers to a method of delivering scheduling information for a corresponding cell through the corresponding cell. In the following description, a scheduling method of an unlicensed band cell and a transmission mode setting method corresponding thereto are divided and described.

As an example, the unlicensed band cell may be configured to operate only with cross carrier scheduling. That is, an unlicensed band cell additionally configured as an SCell may be set only by a cross carrier scheduling scheme. For example, scheduling information for data transmission and reception in an unlicensed band cell may be transmitted in a PCell. Here, the PCell may be a licensed band cell. That is, the terminal may monitor the licensed band cell in order to receive scheduling information for the unlicensed band cell configured as SCell.

On the other hand, when the unlicensed band cell is configured only with the cross carrier scheduling scheme, the CRS based transmission mode may not be necessary. Therefore, the transmission mode of the unlicensed band cell may be set only to a DMRS based transmission mode. Through this, there is an advantage that can reduce the load through the CRS transmission and reception in the unlicensed band cell. That is, in the unlicensed band cell, control information including scheduling information is set so as not to be transmitted and received, so that data transmitted and received in the unlicensed band cell may be transmitted and received according to a DMRS based transmission mode.

As another example, the unlicensed band cell may be configured to enable both cross carrier scheduling or self carrier scheduling. That is, the unlicensed band cell may be configured by a cross carrier scheduling method or a self carrier scheduling method, if necessary. If the unlicensed band cell is configured in a cross-carrier scheduling scheme, the CRS based transmission mode may not be necessary, and thus data transmitted and received in the unlicensed band cell may be set to a DMRS based transmission mode. Accordingly, the UE may operate by assuming only scheduling in the corresponding DMRS-based transmission mode.

In contrast, when the unlicensed band cell is configured in a self-carrier scheduling scheme, the configuration of the terminal may be divided according to a channel through which scheduling information is transmitted.

As an example of the self-scheduling scheme, when scheduling information is received through the PDCCH, a CRS for PDCCH decoding may be needed. Therefore, when 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 terminal may operate by assuming scheduling in a corresponding CRS based transmission mode and a DMRS based transmission mode.

As another example of the self-scheduling scheme, CRS is not necessary when scheduling information is received through the EPDCCH. Accordingly, similarly to the case in which the cross carrier scheduling method is set, the CRS based transmission mode may be excluded and data may be transmitted and received only in the DMRS based transmission mode. The UE may operate by assuming only scheduling in a corresponding DMRS-based transmission mode.

The operation of the base station in which the present invention described above can be performed will be described.

14 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.

A base station according to another embodiment of the present invention transmits a reference signal for RRM measurement and channel measurement of an unlicensed band cell, and receives an RRM measurement result and a channel quality measurement result of an unlicensed band cell measured based on the reference signal. Comprising a step and configuring the unlicensed band cell as a secondary cell based on the RRM measurement result and the channel quality measurement result, the unlicensed band cell provides a method using a frequency band shared by one or more communication systems.

Referring to FIG. 14, the base station of the present invention may include transmitting a reference signal for RRM measurement and channel measurement of an unlicensed band cell (S1410). In order to use an unlicensed band cell, a UE needs to measure RRM measurement and channel quality of an unlicensed band cell. Accordingly, the base station can transmit a reference signal that can be used for RRM measurement and channel measurement of an unlicensed band cell. The reference signal may be transmitted according to a transmission resource setting timing of an unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. For example, the reference signal may be transmitted in subframe units of 1 ms according to transmission resource timing set in an unlicensed band cell. Alternatively, the reference signal may be transmitted according to a period smaller than 1 ms. As another example, the reference signal may be transmitted in a subframe set unit according to a duty cycle or a preset period of the existing positioning signal. In addition, the reference signal may be transmitted according to various periods according to the configuration of the base station and the terminal. Meanwhile, the reference signal may include an existing reference signal such as CRS, CSI-RS or discovery RS. Alternatively, a newly defined signal may be used as the reference signal.

The base station of the present invention may include receiving the RRM measurement result and the channel quality measurement result of the unlicensed band cell measured based on the reference signal (S1420). For example, the terminal may measure the RRM and channel quality of the unlicensed band cell using the transmitted reference signal. The base station may receive the RRM measurement result and the channel quality measurement result from the terminal. For example, the RRM measurement result and the channel quality measurement result may include SINR information and RSSI information as signal to interference & noise ratio in addition to RSRP and RSRQ included in the RRM measurement measured based on the reference signal. have. As another example, the RRM measurement result and the channel quality measurement result may be immediately transmitted when the RRM measurement and the channel quality are measured according to the reference signal reception. That is, as shown in FIG. 12, since an unlicensed interval of an unlicensed band cell may occur, the UE immediately transmits the RRM measurement result and the channel quality measurement result when the RRM measurement and the channel quality are measured, and the base station receives this. can do. Even in this case, the received RRM measurement result and channel quality measurement result may include SINR information and RSSI information in addition to RSRP and RSRQ included in the RRM measurement.

Meanwhile, the base station may include configuring an unlicensed band cell as a secondary cell based on the RRM measurement result and the channel quality measurement result (S1430). The base station may configure the corresponding unlicensed band cell in the form of carrier aggregation or dual connectivity based on the RRM measurement result and the channel quality measurement result received from the terminal. However, in the case of an unlicensed band cell, a problem of sharing with a plurality of communication systems may occur, and thus the data transmission mode may be set differently from the conventional method. As an example, the unlicensed band cell may be classified according to a scheduling scheme to set a transmission mode. For example, when the unlicensed band cell is set to a cross-carrier scheduling method for receiving scheduling information using the licensed band cell, the unlicensed band cell may be configured as a DMRS based transmission mode. Alternatively, when the unlicensed band cell is set in a self-carrier scheduling scheme, it may be configured in a CRS or DMRS based transmission mode. Specifically, when control information including scheduling information is received through the PDCCH when the unlicensed band cell is set in the self-carrier scheduling scheme, both CRS or DMRS-based transmission modes may be configured. As another example, when the unlicensed band cell is set in a self-carrier scheduling scheme and control information is received through the EPDCCH, the unlicensed band cell may be configured in a DMRS based transmission mode only.

In addition, the base station may perform all the necessary base station operations in carrying out the above-described present invention.

Hereinafter, resource configuration and HARQ operation that can be applied to the present invention will be briefly described.

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

According to another embodiment of the present invention, a terminal includes configuring a carrier merge or dual connectivity using an unlicensed band cell and a licensed band cell, and transmitting and receiving data based on radio resource allocation in an unlicensed band cell. . Here, the unlicensed band cell refers to a cell using a frequency band shared by one or more communication systems.

Referring to FIG. 15, the terminal includes configuring a carrier merge or dual connectivity by using an unlicensed band cell and a licensed band cell (S1510). For example, the terminal may configure carrier aggregation using a licensed band cell and an unlicensed band cell according to the setting of the base station. Alternatively, the terminal may configure dual connectivity using a licensed band cell and an unlicensed band cell. The licensed band cell and the unlicensed band cell constituting carrier aggregation or dual connectivity may each be one or more. That is, the terminal may configure carrier aggregation or dual connectivity using one licensed band cell and one or more unlicensed band cells. Similarly, the terminal may configure carrier aggregation or dual connectivity using one or more licensed band cells and one or more unlicensed band cells. In this case, the terminal may operate by self carrier scheduling or cross carrier scheduling as necessary.

Meanwhile, the terminal includes transmitting and receiving data based on radio resource allocation in an unlicensed band cell (S1520). For example, the terminal may transmit and receive data with the base station through the unlicensed band cell based on a radio resource allocation scheme in the unlicensed band cell. As described above, since an unlicensed band cell shares one or more other shared systems with corresponding frequency resources, a radio resource allocation scheme different from that of a licensed band cell in which one frequency resource is exclusively used by one communication system may be used. . Accordingly, the terminal may transmit and receive data through the unlicensed band cell based on the radio resource allocation set in the unlicensed band cell.

For example, radio resources in an unlicensed band cell may be allocated in units of slots. As another example, radio resources in an unlicensed band cell may be allocated in units of subframes or multiple subframes. Specifically, radio resources in an unlicensed band cell may be allocated in a slot unit of 0.5 ms unit, or may be allocated in a subframe unit of 1 ms unit or multiple subframe units of 2 ms or more unit.

As another example, radio resources in an unlicensed band cell may be allocated according to the frequency band of the unlicensed band cell. For example, different radio resource allocation schemes may be used, depending on the frequency band used by each unlicensed band cell. That is, radio resources may be allocated in units of a predetermined time calculated based on a maximum occupancy time of another communication system such as WiFi that shares a frequency band of an unlicensed band cell.

As another example, radio resources in an unlicensed band cell may be allocated based on a duty cycle configuration that is divided by an unlicensed band cell, a terminal, or a frequency band of an unlicensed band cell. This is because different duty cycles can be configured for each unlicensed band cell, for each terminal, or for each frequency band of an unlicensed band cell. A different radio resource allocation scheme can be applied based on the duty cycle.

As another example, the time and frequency resources of the unlicensed band cell may be time and frequency resources dedicated to the mobile communication system only on the time axis, time and frequency resources dedicated to the WLAN system only, and the mobile communication system and the WLAN. Consideration may be given to how the system sets the time and frequency resources that can be shared. In the case of a section shared by the mobile communication system and the WLAN system, each communication system may use the corresponding radio resource on a competition basis.

As another example, radio resources in an unlicensed band cell may be allocated to a period or subframe set determined based on data retransmission timing according to HARQ retransmission operation. For example, in data transmission and reception between a base station and a terminal, a radio resource allocation period may be set to allow data retransmission in consideration of HARQ retransmission timing for guaranteeing data transmission / reception quality.

The radio resource allocation or setting method of the unlicensed band cell described above will be described below in detail for each embodiment.

Resource Granularity Setting Method and Time / Frequency Resource Setting Method for Unlicensed Band Cell

A method of considering slot allocation;

In an unlicensed band cell, radio resources may be allocated on a slot basis in that a case where an available unit of a transmission resource is smaller than a time to interval (TTI) of 1 ms may occur. For example, when using a List before talk (LBT) mechanism for co-existence with WiFi or another operator's mobile communication system, transmission to a TTI of 1 ms on an unlicensed band frequency may not be possible. Accordingly, in this case, radio resource allocation in units of slots of 0.5 ms units may be performed.

-How to consider subframe allocation

For example, the UE may perform channel state information (CSI) measurement of a corresponding subframe through a reference signal transmitted in every subframe. The reference signal transmitted in every subframe may be a CRS, a CSI-RS, or a discovery RS. In addition, in order for the base station to know the instantaneous measured CSI measurement result for link adaptation, the terminal expects the Ack / Nack for downlink data transmission of the CSI measurement result measured in each subframe. The timing can be reported to the base station. That is, a method of applying radio resource allocation on a subframe basis to an unlicensed band cell may be considered.

-How to consider allocation of multiple subframe units

When a radio resource is allocated in units of multiple subframes, the terminal measures channel state based on reference signals received in each of two or more subframes constituting the multiple subframes, and measures the channel state in each subframe unit. The method may further include reporting average information to which the average or weight of the state measurement information is applied to the base station in units of multiple subframes.

Referring to FIG. 16, the terminal may configure carrier aggregation or dual connectivity using an unlicensed band cell (S1610). Carrier aggregation or dual connectivity may be configured using one or more licensed band cells or unlicensed band cells, respectively, as described with reference to FIG. 15.

Thereafter, the terminal may report channel state measurement information to the base station based on the radio resource allocation method (S1620). For example, the UE may perform channel state information (CSI) measurement of a corresponding subframe through a reference signal transmitted in every subframe. In addition, in order for the base station to know the instantaneous measured CSI measurement result for link adaptation, the terminal expects the Ack / Nack for downlink data transmission of the CSI measurement result measured in each subframe. The timing can be reported to the base station. However, in this case, a problem may occur that the accuracy of the measurement result information of the CSI measured in every subframe unit is lowered. Therefore, when allocating a resource that can be transmitted by an unlicensed band cell in units of multi-subframes, the corresponding CSI measurement result information is averaged, weighted averaging, or reported by the other implementation method. Can be set to do so. Through this, control information overhead due to CSI reporting is performed in every subframe.

The UE may transmit and receive data in an unlicensed band cell according to the CSI measurement result and the scheduling of the base station (S1630). In this case, radio resources in an unlicensed band cell for data transmission and reception may be allocated in units of the multiple subframes described above.

-Method of allocating to fit the frame structure of mobile communication system considering the frame structure used in other communication system

Hereinafter, an example of another communication system sharing a frequency band of an unlicensed band cell with a mobile communication system will be described based on a WLAN system, but is not limited to the WLAN system.

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

Accordingly, in order to maintain co-existence with the WLAN, resource configuration that can be transmitted to an unlicensed band cell may be performed in consideration of the length of the corresponding WLAN maximum transmission resource. Specifically, the unlicensed band cell needs to be compatible with all WiFi settings. Accordingly, in setting radio resources of an unlicensed band cell, configuration information may be transmitted to set which WiFi co-existence is supported in a corresponding frequency band. Through this, coexistence with WiFi in the corresponding frequency band may be performed. If there is a WiFi setting introduced only in a specific frequency band, by transmitting configuration information configured to coexist with WiFi in the corresponding frequency band, it is possible to maintain coexistence with WiFi in the corresponding frequency band.

For example, in order to maintain coexistence with the WLAN using the OFDM scheme, 6.016ms, 3.008ms, or 1.504ms, the length of the maximum occupied time resource, may be set to guarantee WiFi transmission. In addition, when maintaining a radio frame structure of 10ms in the mobile communication system, a radio resource for transmitting a mobile communication system in an unlicensed band cell is 3.984ms, 6.992ms or 8.496ms remaining to guarantee WiFi transmission Can be set.

As another example, when a resource smaller than a subframe unit of 1ms used in the mobile communication system is configured, resource configuration may 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, and thus the corresponding subframe may perform resource configuration using a DwPTS structure.

As another example, when establishing a radio resource for coexistence with the WLAN, the WLAN and the mobile communication system may overlap in some time intervals in order to maintain the maximum occupancy 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 in the time unit of the unlicensed band cell with some WiFi may occur. However, considering that the unlicensed band cell introduction scenario is mainly a small cell, even if there is a signal that can enter the CP of a mobile communication system frame, it can operate in a shorter CP than a conventional cell in a small cell environment, so that a subframe unit or a small slot unit can be used. The transmission resources in the unlicensed band cell may be set to 4 ms, 7 ms and 8.5 ms in. That is, in this case, considering the LTE system configured with a TTI unit of 1ms, the radio resources for the transmission of the mobile communication system in the unlicensed band cell is guaranteed to be 3.984ms, 6.992ms or 8.496ms remaining. When setting, it can be set to the resource configuration of 4ms, 7ms, 8.5ms. For the remaining 0.016ms, 0.008ms, and 0.004ms, considering that the cells considered by the LAA are small cells and hot spots, the delay spread due to multi-path may not be large, and 0.016ms, 0.008ms, and 0.004ms As the loss may not be large in the CP of the last subframe reduced as much, it may be considered as a method of setting a transmission resource so that there is no data loss.

- configuring (configuration) the duty cycle (Duty cycle)

This method is to set the unlicensed band cell to have a duty cycle according to various configurations so as to distinguish between resources that the unlicensed band cell can transmit and resources that the unlicensed band cell cannot transmit. That is, radio resource setting of an unlicensed band cell may be performed according to various duty cycles that can be set. The construction of the duty cycle may take many forms, and some examples will be described in detail below.

For example, a duty cycle may be defined according to a radio frame level or multiple radio frame levels or subframe levels or multiple subframe levels. For example, the duty cycle may be defined in units of 10 ms, which is a radio frame unit. Radio resources for an unlicensed band cell may be set in units of a corresponding duty cycle.

As another example, a multiple duty cycle of 8 ms or 4 ms for switching periodicity of LTE on / off time duration for an on / off time duration switching period of a mobile communication system may be defined. This provides an effect of maintaining the HARQ timing used in the mobile communication system. That is, by setting radio resources in an unlicensed band cell through multiple duty cycles, it is possible to provide the effect of operating the same without separately setting the timing for HARQ retransmission operation.

As another example, cell specific or terminal specific or element carrier and frequency band specific duty cycles may be configured. Specifically, since a scheme for coexistence of an unlicensed band cell and WiFi for each cell may be different, a corresponding configuration may be set differently for each cell. That is, radio resources based on the duty cycle of each cell may be set according to a cell specific duty cycle configuration method. Alternatively, since the WiFis that can be supported for each terminal may be different, and a method for performing coexistence with WiFi may be different according to the corresponding terminal capabilities, the corresponding configuration may be set differently for each terminal. That is, radio resources based on the duty cycle of each terminal may be set according to a UE-specific duty cycle configuration method. Alternatively, since the unlicensed band cell may support different types according to frequency bands or specific component carriers for coexistence with WiFi, the corresponding component carriers and frequency bands may have different configurations. Can be set differently. That is, radio resources based on each component carrier or frequency band can be set according to the component carrier specific or frequency band specific configuration method.

A method of setting three types of time and frequency resources to maintain coexistence with the WLAN system

For example, a dedicated unlicensed band cell usage resource interval that can be used by an unlicensed band cell used as an LTE system, that is, a licensed assisted access (LAA) system, may be set. However, although an unlicensed band cell can be used for an unlicensed band cell dedicated resource, the WLAN system has no way of knowing whether a corresponding resource is a resource for an unlicensed band cell, and thus an interference problem may occur. Therefore, in this case, the mobile communication system can indicate the contents to the WLAN system so that the transmission of the WLAN system can be limited. Through this, in the unlicensed band cell dedicated section, it is possible to solve the problem that the signal of the WLAN system causes interference.

As another example, a dedicated WLAN system utilization resource interval may be set. For example, the LTE or LAA system may not know whether the resource is being used by the WLAN systems and there is no method for instructing access to the WLAN system. Accordingly, the unlicensed band cell may not be transmitted for the radio resource section so that the transmission of the unlicensed band cell may not cause interference to the WLAN system. In addition, even when the LTE or LAA system can instruct the access of the WLAN system using the corresponding radio resources, the corresponding resources may be set such that the unlicensed band cell cannot be accessed. In this way, a problem in which a signal of a mobile communication system causes interference in a dedicated resource section dedicated to a WLAN system may be solved.

As another example, an interval in which an unlicensed band cell and a WLAN system connect with contention-based as a green resource may be set.

By setting the three types of time and frequency resources described above in the mobile communication system, the radio resources can be set so that the WLAN system and the unlicensed band cell can coexist in the same frequency band. In addition, the interference problem between the WLAN system and the unlicensed band cell may be solved.

-Method of setting radio resource to match HARQ timing and retransmission timing used in conventional LTE system

For example, in the case of the FDD frame structure, after receiving scheduling information in the nth subframe, the Ack / Nack is transmitted in the n + 4th subframe, and the retransmission timing after the Ack / Nack is asynchronous. You need to define specifically whether to do it or synchronous.

For example, a resource allocation method for performing HARQ retransmission operation may be set as follows. When the retransmission timing is set to synchronous, a subframe having an 8 ms period may be set as a subframe resource transmitted to an unlicensed band cell by setting time and frequency resources. Alternatively, additional time and frequency resources having a specific offset in an 8 ms period may be allocated according to time and frequency resources available to the unlicensed band cell at the unlicensed band frequency.

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

On the other hand, depending on how to set the retransmission timing may be considered a method of setting resources to enable periodic transmission.

As an example, a method of setting resources to allow periodic transmission in units of radio frames may be considered.

As another example, resources may be configured to enable periodic transmission in units of multiple radio frames.

As another example, resources may be set to enable periodic transmission within one radio frame unit. For example, periodic transmission in one radio frame unit or in a continuous radio frame unit may not be guaranteed in that an unlicensed period of an unlicensed band cell exists. Therefore, resources may be set to enable periodic transmission within one radio frame unit.

As described above, the terminal and the base station of the present invention may perform data transmission / reception through the corresponding unlicensed band cell according to the radio resource setting method in the unlicensed 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 merged with each other.

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

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

A base station for another embodiment of the present invention includes establishing carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell, and transmitting and receiving data based on radio resource allocation in the unlicensed band cell. . Here, the unlicensed band cell refers to a cell using a frequency band shared by one or more communication systems.

Referring to FIG. 17, the base station of the present invention includes a step of establishing carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell (S1710). For example, the base station may configure carrier aggregation or dual connectivity including one or more unlicensed band cells for the terminal. In addition, the base station may be configured to include one or more licensed band cells in setting up carrier aggregation or dual connectivity.

The base station includes transmitting and receiving data based on radio resource allocation in an unlicensed band cell (S1720). The base station may transmit and receive data to and from the terminal using an unlicensed band cell according to the radio resource allocation method defined according to the above-described embodiments. In more detail, radio resource allocation in an unlicensed band cell may be allocated in any one of a slot unit, a subframe unit, and a multiple subframe unit. Alternatively, radio resources in an unlicensed band cell may be allocated according to the frequency band of the unlicensed band cell. In this case, radio resources may be allocated in units of time calculated as a factor using the maximum occupancy time information of another communication system sharing the frequency band of the unlicensed band cell. Alternatively, radio resources in an unlicensed band cell may be allocated based on a duty cycle configuration that is divided by an unlicensed band cell, a terminal, or a frequency band of an unlicensed band cell. Alternatively, the frequency band of the unlicensed band cell may be set to be divided into a mobile communication system only, a wireless LAN system only, or a mobile communication system and a wireless LAN system sharing section on a time axis. Alternatively, radio resources in the unlicensed band cell may be allocated to a period or subframe set determined based on the data retransmission timing according to the HARQ retransmission operation.

In addition, radio resources in an unlicensed band cell may be allocated according to the above-described embodiments and combinations of the embodiments.

18 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.

Referring to FIG. 18, the base station includes setting a carrier merge or dual connectivity by using an unlicensed band cell and a licensed band cell (S1810). For example, the base station may configure carrier aggregation or dual connectivity including one or more unlicensed band cells for the terminal. In addition, the base station may be configured to include one or more licensed band cells in setting up carrier aggregation or dual connectivity.

When a radio resource in an unlicensed band cell is set in multiple subframe units, 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 the multiple subframes. In operation S1820, the method may further include receiving average information obtained by applying an average or a weight of the multiple subframes. For example, the base station receives CSI information measured based on a reference signal transmitted in each subframe unit, but the CSI information may be an average value of multiple subframe units for channel state measurement information measured in each subframe unit. have. Alternatively, the CSI information may be a weighted average value of the multiple subframe units for the channel state measurement information measured in each subframe unit. That is, it may be a value obtained by averaging the weighted CSI information measured for each subframe according to the weight setting.

The base station includes transmitting and receiving data based on radio resource allocation in an unlicensed band cell (S1830). The base station may transmit and receive data to and from the terminal using an unlicensed band cell according to the radio resource allocation method defined according to the above-described embodiments.

HARQ-ACK and Retransmission Method for Downlink Data Transmission on Unlicensed Band Cell

As described above, since the unlicensed band cell uses a frequency band shared by a plurality of communication systems, an unusable section may exist. Therefore, a problem may occur in which data retransmission according to HARQ timing is not guaranteed. In order to solve this problem, it is necessary to define a specific timing or retransmission operation method for the HARQ retransmission operation in the unlicensed band cell.

19 is a view for explaining a terminal operation for HARQ retransmission of the present invention.

Referring to FIG. 18, the terminal of the present invention may include configuring carrier aggregation using an unlicensed band cell and a licensed band cell, and monitoring the reception of data in the unlicensed band cell (S1910). An unlicensed band cell may mean a cell using a frequency band shared by one or more communication systems. The UE may monitor to identify downlink data received from the unlicensed band cell.

When downlink data is normally received in the unlicensed band cell, the terminal may transmit an Ack for the received downlink data to the base station (S1920). For example, the terminal may transmit an Ack for the received downlink data to a base station through a PCell of a licensed band, an SCell of a licensed band, or an SCell having uplink available resources among unlicensed band cells.

Similarly, when downlink data is not normally received in an unlicensed band cell, the terminal may transmit a hack to the base station that the corresponding downlink data has not been received (S1920). For example, the UE may transmit a Nack indicating that downlink data has not been received to a base station through a PCell of a licensed band, an SCell of a licensed band, or an SCell having uplink available resources among unlicensed band cells. In this case, the terminal needs to perform monitoring for receiving downlink data retransmitted according to the HARQ retransmission procedure.

On the other hand, if the terminal of the present invention fails to receive the data, it may include the step of receiving the scheduling information for monitoring the data retransmitted in the licensed band cell (S1930). The scheduling information may indicate information indicating that data to be scheduled is data that has not been received in the unlicensed band cell.

For example, the information to be displayed may be a value preset in order to indicate that data of the carrier indicator field has failed to be received in the unlicensed band cell. As another example, the indication information may be a value of a carrier indicator field indicating an unlicensed band cell. The terminal may further include determining that the data is data that has not been received in the unlicensed band cell based on the scheduling information and the available subframe information of the unlicensed band cell.

The UE may receive downlink data that has failed to be received in the unlicensed band cell in the licensed band cell. Through this, data QoS according to the HARQ retransmission procedure of the conventional LTE system can be guaranteed. In addition, even if an unlicensed period exists in the unlicensed band cell, it is possible to perform a reliable data transmission / reception operation by performing the HARQ retransmission operation.

Hereinafter, specific embodiments for the above-described HARQ operation of the present invention will be described with reference to the following.

In retransmission according to HARQ-ACK / NACK of an unlicensed band cell, continuous retransmission may be impossible in an unlicensed band cell. Accordingly, the downlink data transmission transmitted to the unlicensed band cell may be configured to be transmitted by the PCell or SCell cell using the licensed band cell. In addition, when a retransmission operation of data transmitted and received in an unlicensed band cell is performed in a licensed band PCell or SCell, it is necessary to distinguish the transmission of PCell or SCell data used in a conventional licensed band cell. The following describes an embodiment in which the distinction is indicated explicitly or implicitly in a concrete manner.

Implicit instructions

As an example, the terminal may receive scheduling information for receiving retransmission data from the base station according to the HARQ retransmission procedure. The scheduling information may include information for indicating that the corresponding downlink data is retransmission data due to the data reception failure in the unlicensed band cell. Specifically, when a carrier indicator field (CIF) is used during carrier aggregation, retransmission data of an unlicensed band cell may be indicated using a field value not used in the CIF. That is, a field not used in CIF may be used as an indicator indicating retransmission data of an unlicensed band cell. For example, the current carrier merging technology is configured to merge up to five component carriers at the terminal entrance. Therefore, among the states that can be represented by a CIF consisting of three bits, there are bit combinations that are not used for actual cross carrier scheduling. That is, three bits may indicate eight states, but since carrier aggregation currently considers a maximum of five element carriers, there are three values indicating and indicating five element carriers. Accordingly, the three values may be used as a value for indicating retransmission for the unlicensed band cell configured by the terminal. The terminal may recognize that the corresponding data is data for retransmission of the unlicensed band cell by using the information set by the base station. On the other hand, when explicitly indicating using the unused value of the CIF can be set to indicate up to three unlicensed band cells.

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

As another example, an unused code-point or specific information field of any information field used for granting scheduling information for retransmission data to be transmitted to an unlicensed band cell. The combination may be set by the base station implicitly. The UE may obtain the gain according to HARQ retransmission by recognizing that the corresponding data is data for retransmission of the unlicensed band cell using the information set by the base station.

According to each embodiment described above, the base station may recognize that the data received through the licensed band cell is retransmission data transmitted from the unlicensed band cell.

Explicit Instruction

The base station may transmit to the terminal including an indicator that may indicate that the retransmission of the unlicensed band cell in the scheduling information (grant) indicating the retransmission. A bit size that may use the indicator may be set to 1 bit, and may be set to distinguish between a licensed band cell and an unlicensed band cell using 1 bit. Alternatively, a bit size that may use the indicator may be set to multiple bits. In this case, since several cells may be merged as unlicensed band cells, the plurality of unlicensed band cells may be distinguished and indicated.

A case where the terminal described above receives the retransmission data according to the HARQ retransmission procedure in the licensed band cell will be described with reference to the base station.

20 is a view for explaining the operation of a base station for HARQ retransmission of the present invention.

Referring to FIG. 20, when a carrier aggregation is configured using an unlicensed band cell and a licensed band cell, the base station according to another embodiment of the present invention may include transmitting data in the unlicensed band cell (S2010). . The base station may configure and configure carrier aggregation in the terminal. Carrier aggregation may consist of one or more licensed band cells and one or more unlicensed band cells. The base station may transmit downlink data to the terminal using an unlicensed band cell. In this regard, the UE may perform an HARQ ACK / NACK operation indicating normal reception of downlink data.

When the terminal fails to receive the data, the base station receives a NACK through a PCell of a licensed band, an SCell of a licensed band, or an SCell having an uplink available resource among unlicensed band cells, and receives a NACK to data retransmitted from the licensed band cell. It may include the step of transmitting the scheduling information (S2020). If the terminal does not normally receive the downlink data in the unlicensed band cell transmitted by the base station, the base station may retransmit the corresponding downlink data to the terminal. In this case, the base station may transmit retransmission data using the licensed band cell. In addition, for this purpose, the base station may transmit scheduling information of retransmission data to the terminal. In this case, the terminal needs to know that the data received in the licensed band cell is data retransmitted downlink data of the unlicensed band cell. Accordingly, the base station may include information for indicating this in the scheduling information and transmit the information to the terminal.

The indication information included in the scheduling information by the base station may be included in an implicit or explicit manner according to each embodiment described above. That is, as described above, an unused value of the CIF field may be set and used. Alternatively, the UE may combine the available or unavailable subframe information of the unlicensed band cell with the CIF value to make the UE aware. Alternatively, the indication information may be transmitted using an unused code or information field that may be included in the scheduling information. Alternatively, the explicit information may indicate that the scheduling information or data in the licensed band cell relates to retransmission data.

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

On the other hand, in the unlicensed band, operation ambiguity with a plurality of communication systems can be prevented, and interference with other signals can be reduced to stably process a large amount of high-speed data.

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

21 is a diagram illustrating a terminal configuration according to another embodiment of the present invention.

Referring to FIG. 21, a user terminal 2100 according to another embodiment may include a receiver 2130 that receives a reference signal for RRM measurement and channel measurement of an unlicensed band cell, and an unlicensed band cell measured based on a reference signal. And a transmitter 2120 for transmitting the RRM measurement result and the channel quality measurement result, and a controller 2110 for controlling data transmission / reception if the unlicensed band cell is configured as a secondary cell.

The receiver 2130 receives a reference signal from the base station. The reference signal may be received in an unlicensed band cell. The reference signal may be received according to a transmission resource setting timing of an unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. For example, the reference signal may be received in units of 1 ms subframes according to transmission resource timing set in the unlicensed band cell. Alternatively, the reference signal may be received according to a period less than 1 ms. As another example, the reference signal may be received in units of subframe sets according to a duty cycle or a preset period of the existing positioning signal. In addition, the reference signal may be received according to various periods according to the configuration of the base station and the terminal. Meanwhile, the reference signal may include an existing reference signal such as CRS, CSI-RS or discovery RS. Alternatively, a newly defined signal may be used as the reference signal. In addition, the receiver 2130 receives downlink control information, data, and a message from a base station through a corresponding channel.

The transmitter 2120 transmits an RRM measurement result and a channel quality measurement result of the unlicensed band cell measured based on the reference signal. For example, the terminal may measure the RRM and channel quality of the unlicensed band cell using the received reference signal. The terminal may transmit the measured RRM measurement result and the channel quality measurement result to the base station. For example, the RRM measurement result and the channel quality measurement result may include Signal to Interference & Noise Ratio (SINR) information and RSSI in addition to RSRP and RSRQ included in the RRM measurement measured based on the reference signal. . As another example, the RRM measurement result and the channel quality measurement result may be immediately transmitted when the RRM measurement and the channel quality are measured according to the reception of the reference signal. That is, as shown in FIG. 12, since an unlicensed interval of an unlicensed band cell may occur, the terminal may immediately transmit a corresponding RRM measurement result and a channel quality measurement result when the RRM measurement and the channel quality are measured. In this case, the transmitted channel quality measurement result may include SINR information and RSSI as signal-to-noise ratio in addition to RSRP and RSRQ included in the RRM measurement. In addition, the transmitter 2120 transmits uplink control information, data, and a message to a base station through a corresponding channel.

The controller 2110 controls the overall operation of the UE in the RRM measurement and channel measurement method and data transmission mode setting for using the unlicensed band cell required to carry out the above-described present invention. In addition, the controller 2110 may control a data transmission / reception operation when the unlicensed band cell is configured as a secondary cell. If the unlicensed band cell is configured in a carrier merge or dual connectivity form, the controller 2110 may control data transmission and reception using the corresponding unlicensed band cell. However, in the case of an unlicensed band cell, a problem of sharing with a plurality of communication systems may occur, and thus the data transmission mode may be set differently from the conventional method. For example, the data transmission mode in the unlicensed band cell may be set according to the scheduling method of the unlicensed band cell. For example, when the unlicensed band cell is set to a cross-carrier scheduling method for receiving scheduling information using the licensed band cell, the unlicensed band cell may be configured as a DMRS based transmission mode. Alternatively, when the unlicensed band cell is set in a self-carrier scheduling scheme, it may be configured in a CRS or DMRS based transmission mode. Specifically, when control information including scheduling information is received through the PDCCH when the unlicensed band cell is set in the self-carrier scheduling scheme, both CRS or DMRS-based transmission modes may be configured. As another example, when the unlicensed band cell is set in a self-carrier scheduling scheme and control information is received through the EPDCCH, the unlicensed band cell may be configured in a DMRS based transmission mode only.

In addition, the control unit 2110 may control the overall operation of the terminal required for the above-described performance of the present invention.

Meanwhile, the terminal of the present invention may be configured as follows to perform the above-described radio resource setting method and HARQ retransmission method.

Once again, referring to FIG. 21, the user terminal 2100 according to another embodiment includes a control unit 2110 and an unlicensed band cell that configure carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell. A transmitter 2120 transmits data based on radio resource allocation and a receiver 2130 receives data based on radio resource allocation in an unlicensed band cell.

The controller 2110 may configure carrier aggregation using the licensed band cell and the unlicensed band cell according to the setting of the base station. Alternatively, the controller 2110 may configure dual connectivity by using a licensed band cell and an unlicensed band cell. The licensed band cell and the unlicensed band cell constituting carrier aggregation or dual connectivity may each be one or more. In addition, the controller 2110 may control the overall configuration of the terminal 2100 for performing the above-described present invention.

The transmitter 2120 may transmit HARQ ACK / NACK for uplink data and downlink data to the base station based on radio resource allocation in the unlicensed band cell. The receiver 2130 may receive downlink data based on radio resource allocation in an unlicensed band cell.

In addition, the radio resources of the unlicensed band cell may be set as in the above-described embodiments. For example, radio resources in an unlicensed band cell may be allocated in units of slots.

As another example, radio resources in an unlicensed band cell may be allocated in units of subframes or multiple subframes. Specifically, radio resources in an unlicensed band cell may be allocated in a slot unit of 0.5 ms unit, or may be allocated in a subframe unit of 1 ms unit or multiple subframe units of 2 ms or more unit.

As another example, radio resources in an unlicensed band cell may be allocated according to a frequency band of an unlicensed band cell. For example, different radio resource allocation schemes may be used, depending on the frequency band used by each unlicensed band cell. That is, radio resources may be allocated in units of a predetermined time calculated based on a maximum occupancy time of another communication system such as WiFi that shares a frequency band of an unlicensed band cell.

As another example, radio resources in an unlicensed band cell may be allocated based on a duty cycle configuration that is divided by an unlicensed band cell, a terminal, or a frequency band of an unlicensed band cell. This is because different duty cycles can be configured for each unlicensed band cell, for each terminal, or for each frequency band of an unlicensed band cell. A different radio resource allocation scheme can be applied based on the duty cycle.

As another example, the time and frequency resources of the unlicensed band cell may be a time and frequency resource set to be used exclusively by a mobile communication system (for example, an LAA system) on a time axis, and a time and frequency resource set to be used exclusively by a WLAN system. And a time and frequency resource interval set to be shared by the mobile communication system and the wireless LAN system. In the case of a section shared by the mobile communication system and the WLAN system, each communication system may use the corresponding radio resource on a competition basis.

As another example, radio resources in an unlicensed band cell may be allocated to a period or subframe set determined based on data retransmission timing according to HARQ retransmission operation. For example, in data transmission and reception between a base station and a terminal, a radio resource allocation period may be set to allow data retransmission in consideration of HARQ retransmission timing for guaranteeing data transmission / reception quality.

Meanwhile, in relation to the HARQ retransmission procedure, the controller 2110 may configure carrier aggregation using the unlicensed band cell and the licensed band cell in connection with the HARQ procedure to monitor reception of data in the unlicensed band cell. In addition, in relation to the HARQ retransmission procedure, when the reception unit 2130 fails to receive data, the receiver 2130 may receive scheduling information for monitoring data retransmitted in the licensed band cell. The scheduling information may include information indicating that the data received in the licensed band cell is retransmission data for the data failed to be received in the unlicensed band cell. As with each of the embodiments described above, the information to be displayed may be indicated in an explicit or implicit manner. In addition, the transmitter 2120 may transmit an Ack for the received downlink data to the base station. For example, the transmitter 2120 may transmit an Ack for the received downlink data to a base station through a PCell of a licensed band, an SCell of a licensed band, or an SCell having uplink available resources among unlicensed band cells.

Similarly, the transmitter 2120 may transmit a hack to the base station that the corresponding downlink data is not received. For example, the transmitter 2120 may transmit a Nack indicating that downlink data has not been received to a base station through a PCell of a licensed band, an SCell of a licensed band, or an SCell having uplink available resources among unlicensed band cells.

22 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

Referring to FIG. 22, the base station 2200 according to another embodiment includes a transmitter 2220 for transmitting a reference signal for RRM measurement and channel measurement of an unlicensed band cell and an RRM of an unlicensed band cell measured based on a reference signal. The receiver 2230 that receives the measurement result and the channel quality measurement result, and a controller 2210 configured to configure the unlicensed band cell as the secondary cell based on the RRM measurement result and the channel quality measurement result.

The transmitter 2220 may transmit a reference signal for RRM measurement and channel measurement of an unlicensed band cell. The reference signal may be received according to a transmission resource setting timing of an unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. In addition, the transmitter 2220 may transmit a reference signal in the unlicensed band.

The receiver 2230 may receive an RRM measurement result and a channel quality measurement result from the terminal. The RRM measurement result and the channel quality measurement result may be received in the licensed band cell and include information on the RRM measurement result and the channel quality measurement result of the unlicensed band cell. For example, the RRM measurement result and the channel quality measurement result may include SINR information and RSSI as signal to interference & noise ratio in addition to RSRP and RSRQ included in the RRM measurement measured based on the reference signal. . As another example, the RRM measurement result and the channel quality measurement result may be immediately transmitted when the RRM measurement and the channel quality are measured according to the reference signal reception.

In addition, the transmitter 2220 and the receiver 2230 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

The controller 2210 may control whether to add or activate an unlicensed band cell to the terminal based on the RRM measurement result and the channel quality measurement result. In addition, the controller 2210 configures carrier aggregation and dual connectivity by using an unlicensed band necessary for carrying out the above-described present invention, and when the data is transmitted and received in an unlicensed band cell, an unlicensed band for coexistence with other communication systems. Controls the overall operation of the base station for a specific method of guaranteeing the resource setting of the cell and QoS of data transmitted and received.

Meanwhile, the terminal of the present invention may be configured as follows to perform the above-described radio resource setting method and HARQ retransmission method.

Once again, referring to FIG. 22, a base station 2200 according to another embodiment includes a control unit 2210 for configuring carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell, and wireless in an unlicensed band cell. The transmitter 2220 may transmit data based on resource allocation, and the receiver 2230 may receive data based on radio resource allocation in an unlicensed band cell.

The controller 2210 may configure and configure carrier aggregation in the terminal. Carrier aggregation may consist of one or more licensed band cells and one or more unlicensed band cells. In addition, the controller 2210 may control the overall operation of the base station 2200 in performing the above-described embodiments of the present invention.

The transmitter 2220 may transmit data to the terminal based on radio resource allocation in the unlicensed band cell. In addition, the receiver 2230 may receive uplink data based on radio resource allocation in an unlicensed band cell. In addition, the transmitter 2220 and the receiver 2230 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

As described above, radio resources of an unlicensed band cell may be set in various ways, and the controller 2210, the transmitter 2220, and the receiver 2230 each perform the above-described operations according to the radio resource setting method. can do.

On the other hand, the control unit 2210 may configure a carrier merge to the terminal, and control the operation of the base station for data transmission, scheduling information transmission to the terminal in relation to the HARQ retransmission operation.

The transmitter 2220 may transmit downlink data using an unlicensed band cell to a terminal and transmit retransmission data according to HARQ retransmission through a licensed band cell. As described above, the scheduling information may include information indicating that the corresponding scheduling information or the downlink data is retransmission for the data that fails to be transmitted in the unlicensed band cell. Specifically, the displayed information may deliver the corresponding information to the terminal in an implicit manner or in an explicit manner as in the above-described embodiments.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with Korea Patent Application No. 10-2014-0091304 filed with Korea on July 18, 2014 and Patent Application No. 10-2015-0070941 filed with Korea on May 21, 2015 and June 2015. Patent Application No. 10-2015-0082466, filed with Korea on November 11, claims priority under 35 USC § 119 (a) of the United States Patent Act, all of which are hereby incorporated by reference. Incorporated into the application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (20)

In the data transmission and reception method of the terminal, Receiving a reference signal for RRM measurement and channel measurement of an unlicensed band cell; Transmitting an RRM measurement result and a channel quality measurement result of the unlicensed band cell measured based on the reference signal; And If the unlicensed band cell is configured as a secondary cell, including the step of controlling the data transmission and reception operation, The unlicensed band cell is a cell using a frequency band shared by one or more communication systems. The method of claim 1, The reference signal is, And receiving according to a transmission resource setting timing of the unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. The method of claim 1, The RRM measurement result and channel quality measurement result, Reference Signal Received Power (RSRP) information or RSRQ (Reference) measured based on the reference signal including a Cell Specific Reference Signal (CRS), a Channel State Information-Reference Signal (CSI-RS), or a Discovery Reference Signal (RSS) Signal Received Quality) information, A signal to noise ratio (Signal to Interference & Noise Ratio), characterized in that it further comprises SINR information or RSSI (Received Signal Strength Indicator) information. The method of claim 1, Data in the unlicensed band cell is, When the unlicensed band cell is configured in a cross-carrier scheduling scheme, transmission and reception in a transmission mode based on a demodulation reference signal (DMRS). The method of claim 1, Data in the unlicensed band cell is, If the unlicensed band cell is set to a self-carrier scheduling scheme, And transmitting / receiving in a transmission mode based on a cell specific reference signal (CRS) or a transmission mode based on a demodulation reference signal (DMRS) according to a channel type in which the scheduling information for data transmission and reception is received. In the data transmission and reception method of the base station, Transmitting a reference signal for RRM measurement and channel measurement of an unlicensed band cell; Receiving an RRM measurement result and a channel quality measurement result of the unlicensed band cell measured based on the reference signal; And And configuring the unlicensed band cell as a secondary cell based on the RRM measurement result and the channel quality measurement result. The unlicensed band cell is a cell using a frequency band shared by one or more communication systems. The method of claim 6, The reference signal is, And transmitting according to a transmission resource setting timing of the unlicensed band cell preset in a subframe unit, a subframe set unit, or a duty cycle unit. The method of claim 6, The RRM measurement result and channel quality measurement result, Reference Signal Received Power (RSRP) information or RSRQ (Reference) measured based on the reference signal including a Cell Specific Reference Signal (CRS), a Channel State Information-Reference Signal (CSI-RS), or a Discovery Reference Signal (RSS) Signal Received Quality) information, A signal to noise ratio (Signal to Interference & Noise Ratio), characterized in that it further comprises SINR information or RSSI (Received Signal Strength Indicator) information. The method of claim 6, The unlicensed band cell, When set to the cross-carrier scheduling method, characterized in that it is set to the transmission mode based on the DMRS (Demodulation Reference Signal). The method of claim 6, The unlicensed band cell, When the self-carrier scheduling method is set, the transmission mode based on the cell specific reference signal (CRS) or the transmission mode based on the demodulation reference signal (DMRS) is set according to the channel type through which scheduling information for data transmission and reception is transmitted. How to. In the data transmission and reception method of the terminal, Configuring carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell; And And transmitting and receiving data based on radio resource allocation in the unlicensed band cell, The unlicensed band cell is a cell using a frequency band shared by one or more communication systems. The method of claim 11, Radio resources in the unlicensed band cell, The method is characterized in that the allocation in any one of a slot unit, a subframe unit and multiple subframe units. The method of claim 11, Radio resources in the unlicensed band cell, Are allocated according to the frequency band of the unlicensed band cell, And a maximum occupancy time of another communication system sharing the frequency band of the unlicensed band cell in a predetermined time unit calculated as one element. The method of claim 11, Radio resources in the unlicensed band cell, And is assigned based on a duty cycle configuration divided by the unlicensed band cell, the terminal, or the frequency band of the unlicensed band cell. The method of claim 11, The frequency band of the unlicensed band cell is, And a mobile communication system dedicated, a wireless LAN system dedicated or divided into a shared section of the mobile communication system and the wireless LAN system on a time axis. In the data transmission and reception method of the base station, Establishing carrier aggregation or dual connectivity using an unlicensed band cell and a licensed band cell; And And transmitting and receiving data based on radio resource allocation in the unlicensed band cell, The unlicensed band cell is a cell using a frequency band shared by one or more communication systems.  The method of claim 16, Radio resources in the unlicensed band cell, The method is characterized in that the allocation in any one of a slot unit, a subframe unit and multiple subframe units. The method of claim 16, Radio resources in the unlicensed band cell, Are allocated according to the frequency band of the unlicensed band cell, And a maximum occupancy time of another communication system sharing the frequency band of the unlicensed band cell in a predetermined time unit calculated as one element. The method of claim 16, Radio resources in the unlicensed band cell, And is assigned based on a duty cycle configuration divided by the unlicensed band cell, the terminal, or the frequency band of the unlicensed band cell. The method of claim 16, The frequency band of the unlicensed band cell is, And a mobile communication system dedicated, a wireless LAN system dedicated or divided into a shared section of the mobile communication system and the wireless LAN system on a time axis.

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