KR20150114389A - Methods for transmitting a uplink shared channel(UL-SCH) and receiving a downlink shared channel(DL-SCH) and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and an apparatus for setting scheduling in an uplink and a downlink. Particularly, when a terminal sets scheduling in the uplink and the downlink with a first base station and a second base station, the method includes: a step of the terminal for constructing dual connectivity with the first base station and the second base station; a step of the terminal for receiving scheduling information about transmission to the uplink and scheduling information about reception from the downlink from the first base station and the second base station; and a step of the terminal for applying scheduling information of either the first base station or the second base station to uplink transmission or downlink reception if the size of the scheduling information is larger than the maximum size of transmission data or the maximum size of reception data.

Description

[0001] The present invention relates to a method and apparatus for establishing transmission of an uplink shared channel and reception of a downlink shared channel, and a method and apparatus for setting up a downlink shared channel (DL-SCH)

The present invention proposes an operation of a UE when it receives scheduling information of more than DL-SCH bits that can be received by the UE from different base stations under a dual connectivity and can receive the maximum number of DL-SCH bits per TTI or receives scheduling, The present invention proposes an operation of a UE when it receives scheduling information that is higher than the number of UL-SCH bits that can be transmitted maximum per TTI from a different base station to a base station in the case of an uplink under dual connectivity or receives scheduling.

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

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

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

However, there is a problem in that, after dual connectivity is configured, when a terminal can process from a plurality of base stations or if it is scheduled to exceed the maximum expected data size, the terminal malfunctions.

According to an embodiment of the present invention, a maximum data size promised between a mobile station and a base station may not be applied in a scheduling process with another base station under dual connectivity. In this case, An error may occur in uplink transmission or downlink reception between two base stations or one of the base stations. Therefore, a technique for controlling operations of the base station and the base station is proposed.

According to an aspect of the present invention, there is provided a method for receiving scheduling information of a number of DL-SCH bits that can be received by a UE from different base stations per TTI under a dual connectivity (DC) A method for controlling the operation of the terminal when scheduling is performed, and a terminal for implementing the method.

The present invention provides a method for controlling the operation of a UE when it receives scheduling information of more than UL-SCH bits that can be transmitted at maximum per TTI from a different base station to a base station in the case of an uplink under DC, And provides a terminal implementing this.

The UE establishing scheduling in the uplink and the downlink with the first base station or the second base station according to an embodiment of the present invention may be configured such that the UE configures the dual connectivity with the first base station and the second base station A step in which the UE receives scheduling information for uplink transmission or scheduling information for downlink reception from a first base station or a second base station, The UE may apply the scheduling information of either the first base station or the second base station to the uplink transmission or downlink reception of the UE.

The first BS establishing scheduling in the uplink and the downlink with the MS according to another embodiment of the present invention includes the steps of exchanging scheduling information for the MS by the first BS and the second BS configuring the dual connectivity with the MS And transmitting, by the first base station, the scheduling information on data to be transmitted on the uplink or the data to be received on the downlink based on the exchanged information.

In accordance with another aspect of the present invention, there is provided a terminal configured to establish scheduling in an uplink and a downlink with a first base station or a second base station, a controller configured to form dual connectivity with a first base station and a second base station, Wherein the scheduling information includes scheduling information for uplink transmission or scheduling information for downlink reception from a first base station or a second base station, The scheduling information of either the first base station or the second base station is applied to uplink transmission or downlink reception.

According to another aspect of the present invention, there is provided a base station for establishing scheduling in an uplink and a downlink with a mobile station, the mobile station including a transmitter for transmitting data with the mobile station, a receiver for receiving data with the mobile station, And a controller for exchanging scheduling information with respect to the second base station and the terminal and controlling the transmitter and the receiver. The scheduling information for the data to be transmitted in the uplink or the data to be received in the downlink according to the exchanged information, And the control unit controls the transmission unit to transmit the information to the terminal.

In the case of applying the present invention, when receiving scheduling information of more than DL-SCH bits that can be received by the UE from different MeNBs and SeNBs per TTI in the case of downlink under dual connectivity, Can be controlled.

In the case of applying the present invention, when receiving scheduling information of more than UL-SCH bits that can be transmitted maximum per TTI from a different MeNB and SeNB to a base station in the case of an uplink under dual connectivity, The operation can be controlled.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a small cell development according to an embodiment. Fig.
2 is a diagram showing a small cell deployment scenario.
3 to 6 are diagrams showing detailed scenarios in the small cell deployment.
Figure 7 is a diagram showing various scenarios of carrier merging.
FIG. 8 is a diagram illustrating an example of a dual connectivity scenario to which the present invention can be applied.
9 is a diagram showing an example of a dual connectivity structure.
10 is a diagram showing another example of the dual connectivity structure.
11 is a diagram illustrating a process in which a first base station and a second base station and a terminal operate according to an embodiment A-1 of the present invention.
12 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment A-2 of the present invention.
FIG. 13 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of the present invention A-3.
FIG. 14 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of A-4 of the present invention.
15 is a diagram illustrating a process in which a first base station and a second base station and a terminal operate according to an embodiment B-1 of the present invention.
16 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment B-2 of the present invention.
17 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of B-3 of the present invention.
18 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of B-4 of the present invention.
FIG. 19 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment of the present invention. Referring to FIG.
20 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.
FIG. 21 is a diagram illustrating a configuration of a base station according to another embodiment.
22 is a diagram illustrating a configuration of a user terminal according to another embodiment.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Fig. 3 shows scenario # 1 in the small cell expansion. Scenario 1 is a co-channel deployment scenario for small cells and macro cells in the presence of overhead macros and is an outdoor small cell scenario. Reference numeral 310 denotes a case where both the macro cell 311 and the small cell are outdoors, and 312 denotes a small cell cluster. Users are distributed both indoors / outdoors.

The solid lines connecting the small cells in the small cell 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 small cells and macro cells.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Dual  Connectivity ( Dual Connectivity )

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

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

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

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

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

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

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

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

In this specification, when a UE configures dual connectivity, a UE establishes an RRC connection with a UE, terminates a BS or an S1-MME that provides a cell (e.g., Pcell) serving as a reference for handover, The base station acting as a mobility anchor is described as the above-mentioned master base station MeNB or, if necessary, the first base station.

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

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

The first base station (master base station) and the second base station (secondary base station) may each provide at least one cell to the terminal, and the first base station and the second base station may be connected through the interface between the first base station and the second base station. have.

In addition, for ease of understanding, a cell associated with a first base station may be referred to as a macro cell, and a cell associated with a second base station may be referred to as a small cell. However, in the small cell cluster scenario described below, the cell associated with the first base station may also be described as a small cell.

The macrocell in the present invention may mean at least one or more cells and may be written in the meaning of representing the entire cell associated with the first base station. Also, a small cell may mean at least one or more cells, and may be written in the meaning of representing the entire cell associated with the second base station. However, in a specific scenario, such as a small cell cluster as described above, it may be a cell associated with the first base station, in which case the cell of the second base station may be described as another small cell or another small cell.

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

ue - Category

Tables 1 and 2 are diagrams showing UE categories (UE categories, or ue-categories) according to an embodiment of the present invention. The UE Category defines the combined uplink and downlink capabilities. Table 1 shows values of downlink physical layer parameter values set by the UE category field. Table 2 shows the values of uplink physical layer parameter values set by the UE category field. That is, the parameters determined by the UE category are defined by the following Tables 1 and 2, and physical layer parameters for each downlink and uplink are defined according to each UE category.

The value of the downlink physical layer parameter set by the UE category field (set by the field category) UE Category Maximum number of  DL-SCH transport  block bits  received within  a TTI ( Note ) Maximum number  of bits of  a DL-SCH transport block  received within  a TTI Total number  of soft  channel bits Maximum number  of supported  layers for  공간 Multiplexing in DL Category 1 10296 10296 250368 One Category 2 51024 51024 1237248 2 Category 3 102048 75376 1237248 2 Category 4 150752 75376 1827072 2 Category 5 299552 149776 3667200 4 Category 6 301504 149776 (4 layers)
75376 (2 layers) 3654144 2 or 4 Category 7 301504 149776 (4 layers)
75376 (2 layers) 3654144 2 or 4 Category 8 2998560 299856 35982720 8 Category 9 452256 149776 (4 layers)
75376 (2 layers)
5481216 2 or 4 Category 10 452256 149776 (4 layers)
75376 (2 layers)
5481216 2 or 4

The uplink physical layer parameter values set by the field category are set by the UE category field. UE Category Maximum number of  UL-SCH transport  block bits  transmitted within  a TTI Maximum number of  bits of moment UL - SCH  transport block  transmitted within  a TTI Support for  64 QAM  in UL Category 1 5160 5160 No Category 2 25456 25456 No Category 3 51024 51024 No Category 4 51024 51024 No Category 5 75376 75376 Yes Category 6 51024 51024 No Category 7 102048 51024 No Category 8 1497760 149776 Yes Category 9 51024 51024 No Category 10 102048 51024 No

In a DL-SCH to be transmitted from a base station to a mobile station in a state in which a mobile station has a relationship between an existing mobile station and a base station so as to receive a serving from one base station, a DL- The number of bits is defined as Table 1 according to the UE category shown in Table 1.

When one terminal is served from one base station, for example, a master base station, and a secondary base station is added or configured so that one terminal is configured to be configured from two base stations to form a dual connectivity Or if the UE is set to dual connectivity and has dual connectivity from two different base stations, depending on the category of each UE, the UE may exceed the number of bits of the DL-SCH that can be received at maximum per TTI from different base stations . Since the dual connectivity is configured such that different MeNBs and SeNBs perform independent scheduling, the number of DL-SCH bits that can be received from one base station per TTI of the UE is different from that of the other MeNBs and SeNBs There may be a case where the UE is scheduled and allocated resources exceeding the maximum number of DL-SCH bits that can be received per TTI by performing scheduling through an independent scheduler. In this case, the UE may malfunction, and therefore, it is necessary to define the operation of the UE when scheduling is performed such that the UE can receive a maximum number of DL-SCH bits per TTI from the different MeNBs and SeNBs.

In the uplink, the number of bits of the UL-SCH that the UE can transmit to the maximum BS in one TTI when the UE transmits UL-SCH to the BS is determined as Table 2 according to the UE category shown in Table 2 .

When one terminal is set to be served from one base station, for example, a master base station, and a secondary base station is additionally set or configured so that one terminal is configured from two base stations to dual connectivity) In case of establishing dual connectivity from two different base stations, the UE may be scheduled to have the number of bits of the UL-SCH that can be transmitted at maximum per TTI to different base stations according to each UE category have. Since the dual connectivity is configured so that different MeNBs and SeNBs perform independent scheduling, the number of UL-SCH bits that can be transmitted to one base station by a terminal per TTI is different from that of the other MeNBs and SeNBs Scheduling is performed through the scheduler and the UL-SCH transmission is performed. Therefore, there may be a case where the UE is scheduled and allocated resources exceeding the number of UL-SCH bits that can be transmitted at maximum per TTI.

In this case, the UE may malfunction, and therefore, when scheduling is performed so that the maximum number of UL-SCH bits per TTI can be transmitted to the different MeNBs and SeNBs, it is necessary to define the UE's operation.

The present invention proposes an operation of a UE when it receives scheduling information of more than DL-SCH bits that can be received by a UE from different MeNBs and SeNBs in a downlink under a dual connectivity, per TTI, or receives scheduling.

The present invention proposes an operation of a UE when it receives scheduling information more than the number of UL-SCH bits that can be transmitted maximum per TTI from a different MeNB and SeNB in a case of an uplink under dual connectivity or receives scheduling .

In more detail, a process in which a UE receives a downlink signal or transmits an uplink signal from a first base station or a second base station will be described. A terminal having dual connectivity with a first base station and a second base station receives a downlink signal from a first base station and a second base station and receives a downlink signal having a number of bits of a DL- And receives the downlink signal transmitted in consideration of the downlink signal. In addition, the UE having the above-described dual connectivity receives the transmitted scheduling information in consideration of the number of bits of the UL-SCH that can be transmitted by the UE to the first base station and the second base station per TTI, And transmits the uplink signal. Hereinafter, each embodiment of the present invention will be described in detail.

First, an embodiment applicable to the downlink will be described.

A-1 is a method of defining an operation of a terminal in advance according to an embodiment. This determines the number of bits of the DL-SCH transmitted in the downlink from the base station, but allows the terminal to operate normally even if the determination exceeds a certain range. When scheduling the DL-SCH in the downlink to the UE through the independent scheduler of the different base stations MeNB and SeNB, it is possible that the UE may be scheduled to receive more than the maximum receivable DL-SCH bits in one TTI There is still a need to define the operation of the terminal in order to avoid an error case in that case. That is, as an example, "the UE does not expect to receive more than the maximum number of DL-SCH bits that can be received within one TTI" or as another example, "the UE transmits DL It is not expected to receive scheduling information for scheduling more than -SCH bits. " In addition, when the UE receives the corresponding scheduling information, it regards the UE as an error case of downlink DL-SCH reception and performs a retransmission request procedure according to an error case for downlink DL-SCH reception, SCH to the first base station or the second base station. .

11 is a diagram illustrating a process in which a first base station and a second base station and a terminal operate according to an embodiment A-1 of the present invention. The UE sets a maximum DL-SCH size that can be received within a predetermined time period. If the size of the maximum DL-SCH is changed, a DL-SCH of a maximum DL-SCH size is not set from the first base station and the second base station, Is scheduled. The setting of the maximum receivable DL-SCH size may be set in a predefined manner between the UE and the BS. Or information about the size of the maximum receivable DL-SCH in the information transmitted and received between the UE and the BS in the physical layer or higher, and may be set semi-static.

The terminal 1001 and the first base station 1009a set the maximum DL-SCH size within a predetermined time interval (S1110). Here, the TTI is an example of a period of a predetermined time. The first base station 1009a and the second base station 1009b transmit scheduling information to the mobile station under the maximum DL-SCH according to the set size (S1120a, S1120b), and the mobile station transmits data from the downlink according to the received scheduling (S1130a, S1130b). Then, the UE and the first base station 1009a and the second base station 1009b schedule the UEs to receive data having a maximum DL-SCH size or less, unless the maximum DL-SCH is changed.

In addition, when performing scheduling for the DL-SCH in the downlink to the UE 1001 through independent schedulers of the first and second base stations 1009a and 1009b, The UE 1001 regards it as an error case of downlink DL-SCH reception from the first base station and the second base station, and the UE performs a retransmission request procedure , Or informs the first base station or the second base station of an error in reception of the downlink DL-SCH.

In the embodiment A-2, the number of bits of the downlink that can be received is increased. For a terminal having dual connectivity or a terminal having dual connectivity capability, DL-SCH capable of maximum reception considering the reception of DL-SCH by scheduling in one TTI from different types of MeNB and SeNB simultaneously bit size can be increased.

In a case where dual connectivity is configured within the same UE category as an embodiment, a configuration for increasing the DL-SCH bit size can be added to the same category. As another embodiment, a UE category may be defined to support the case where dual connectivity is configured. Alternatively, if dual connectivity is configured in another embodiment, the UE can change the DL-SCH bit size to a predetermined size. For example, in a state where dual connectivity is set, the UE can be configured to increase the DL-SCH bit size by a factor of two or a preset multiple.

12 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment A-2 of the present invention. The terminal 1001 has information on the maximum receivable DL-SCH (S1210). If the UE 1001 is configured to have dual connectivity (S1220), the size of the maximum receivable DL-SCH set in advance is increased by a predetermined size (S1230). The range that can be increased can be set in advance. The UE 1001 may increase the size of a predetermined maximum receivable DL-SCH by a predetermined ratio, for example, twice in the dual connectivity situation. This increase can be made without further instructions from the base station 1009. [ On the other hand, if the dual connectivity situation is terminated (S1240), the terminal 1001 can recover the setting of the maximum receivable DL-SCH set in the step S1210 (S1250).

As an example of A-3, scheduling information can be exchanged between MeNB and SeNB. Under the dual connectivity, independent scheduling can be performed by MeNB and SeNB, and the MeNB and SeNB exchange related scheduling information with each other through X2, so that no error case occurs. Since the scheduling from MeNB and SeNB is dynamically set to the subframe level, only the information exchanged between the MeNB and the SeNB through the X2 interface or the feedback information between the UE through the X2 interface and the UE performing dual connectivity with the MeNB channel and feedback information (e.g., HARQ-ACK / NACK, CSI, UCI (uplink control information)) and feedback channel and feedback information (e.g., HARQ-ACK / NACK, CSI , UCI (uplink control information)) can be used together to adjust the ratio of the maximum DL-SCH that can be received per TTI between the different base stations MeNB and SeNB dynamically at the subframe level.

Or non-ideal backhaul, the exchange of information between MeNB and SeNB over the corresponding X2 interface may have a latency. In this case, there may be a time limit to utilize as scheduling information to be scheduled dynamically, that is, at a subframe level. Therefore, in a range of time units for performing RRC setting in a semi-static manner, different base stations MeNB and SeNB It is possible to adjust the ratio of the size of the bits of the maximum DL-SCH that can be received by the terminal per TTI. As one embodiment of the range of the time unit, for example, the X ms level can be set in the range of the time unit. The time unit can be set so that X is 100 ms or a multiple of 100 ms, or 200 ms, multiple of 200 ms, or 320 ms or multiple of 320 ms.

FIG. 13 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of the present invention A-3. Scheduling information is exchanged between the two base stations 1009a and 1009b connected to the dual connectivity through a separate interface such as X2 (S1310). Then, the two base stations 1009a and 1009b schedule the UEs in the dual connectivity state to below the maximum receivable DL-SCH size set in step S1310 and provide scheduling information to the UEs in steps S1320a and S1320b. The ratio of the range of the DL-SCH that each of the base stations 1009a and 1009b can transmit in the process of exchanging the scheduling information can be determined. In addition, if no delay time occurs in the information exchange between the base stations 1009a and 1009b in this process, the scheduling can be dynamically performed dynamically, that is, at the subframe level as described above. In this process, each of the base stations 1009a and 1009b can adjust the ratio of the maximum DL-SCH using the feedback channel and information with the UE. The transmission of the scheduling information in a semi-static manner is a case where a delay time occurs in exchanging the scheduling information between the base stations 1009a and 1009b as described above. In this case, the range of the time unit according to the RRC setting The ratio of the maximum DL-SCH can be adjusted. If the time range is 200 ms, for example, the scheduling information and the ratio of the DL-SCH may be determined between the base stations 1009a and 1009b during the first 200 ms interval, and then applied for 200 ms. In addition, when the ratio of the DL-SCH and the scheduling information are determined, each of the base stations 1009a and 1009b can transmit data in the downlink within a range that the corresponding base station can transmit until another change occurs.

Subsequently, the Node Bs 1009a and 1009b and the UE 1001 receive data in downlink according to the ratio of the scheduled information and the DL-SCH between the Node Bs 1009a and 1009b (S1330a and S1330b).

A-4 embodiment, scheduling for a particular base station may be applied first. For example, a DL-SCH scheduled in a particular type of eNB may be considered as a priority. As an example, if an RRC connection under dual connectivity is established from the MeNB, the DL-SCH transmitted from the MeNB may be more important than the DL-SCH transmitted from the SeNB. At this time, when scheduling of the maximum DL-SCH bit size is simultaneously performed within one TTI from different eNBs, the UE determines that only the scheduling information received from the MeNB is valid and can receive and decode only the DL-SCH from the MeNB .

In another embodiment, the priority can be determined according to scheduling information transmitted in the DL-SCH. That is, in the DL-SCH transmission in which normal downlink data transmission is set to the lowest priority and other kinds of information are included, priority is given to the DL-SCH from the MeNB or the SeNB that transmits the corresponding information You can set the ranking high. Examples of other types of information include system information, paging information, and information used in an access procedure (e.g., random access response message, etc.). The UE determines that the DL-SCH from the MeNB or the SeNB that transmits the system information, the paging information, the information used in the access procedure, etc. has a high priority, that is, Is valid and can receive and decode only the DL-SCH from the MeNB or the SeNB.

FIG. 14 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of A-4 of the present invention. The base stations 1009a and 1009b can transmit data in the downlink in a size exceeding the maximum DL-SCH set in the terminal (S1410a, S1410b). Since the maximum DL-SCH has been exceeded, the terminal 1001 selectively performs reception and decoding according to preset criteria among them (S1420). And receive and decode based on the scheduling information of a particular base station among the base stations as a selection criterion. In this case, the selected base station may be a specific type of base station, for example, a base station to which an RRC connection is established, and the terminal may select and receive downlink data transmission of the corresponding base station. As another example, a terminal selects a base station that transmits important data (information used for system information, paging information, and an access procedure) according to the importance of data transmitted in the downlink, It can be decoded. The selection criterion of the base station has been described above.

Next, an embodiment applicable to the uplink will be described.

B-1) In the embodiment, the operation of the terminal is defined in advance. This determines the number of bits of the UL-SCH transmitted on the uplink in the base station, but allows the terminal to operate normally even if this determination exceeds a certain range. There is still a possibility that the UE can be scheduled with more than UL-SCH bits that can be transmitted in a TTI with each MeNB and SeNB. Therefore, it is necessary to define the operation of the UE in order to avoid an error case have. That is, as an example, "the UE does not expect to be scheduled for more than the number of UL-SCH bits that can be transmitted in a TTI more than" or as another example, It is not expected to receive scheduling information for transmitting more than -SCH bits. " Also, when the UE receives the corresponding scheduling information, it regards it as an error case of reception of scheduling information for UL-SCH transmission to be transmitted in the uplink, performs a UE procedure according to an error case for UL UL-SCH transmission, Or inform the first base station or the second base station of an error in scheduling for reception of the UL UL-SCH.

15 is a diagram illustrating a process in which a first base station and a second base station and a terminal operate according to an embodiment B-1 of the present invention. The UE sets a maximum UL-SCH size that can be transmitted within a predetermined time interval. The UL-SCH is not set to the UE beyond the maximum UL-SCH. If the maximum UL-SCH size is changed, the UL-SCH is scheduled to be smaller than the changed UL-SCH. The setting of the maximum transmittable UL-SCH size may be set in a predefined manner between the UE and the BS. Or information about the size of the UL-SCH that can be transmitted in the information transmitted and received between the UE and the BS in the physical layer or higher may be set semi-static.

The terminal 1001 and the first base station 1009a set the size of the UL-SCH that can transmit the maximum within a predetermined time interval (S1510). Here, the TTI is an example of a period of a predetermined time. The first base station 1009a and the second base station 1009b transmit scheduling information to the mobile station under the maximum UL-SCH according to the set size (S1520a, S1520b), and the mobile station transmits data in the uplink according to the received scheduling information (S1530a, S1530b). The UE, the first base station and the second base station then schedule the UE to transmit data having a maximum UL-SCH size, unless the maximum UL-SCH is changed.

Also, when performing scheduling for a UL-SCH to be transmitted in an uplink to an MS 1001 through independent schedulers of different first and second base stations 1009a and 1009b, The UE 1001 regards the UE 1001 as an error case of reception of scheduling information for uplink UL-SCH transmission from the first and second base stations, The mobile station UE performs the UE procedure according to the error case for UL UL-SCH transmission or informs the first or second base station of an error in scheduling for UL UL-SCH reception.

In the B-2 embodiment, the maximum number of bits of the uplink that can be transmitted is increased. For a UE having dual connectivity or a UE having dual connectivity capabilities, UL-SCH capable of maximum transmission considering transmission of UL-SCH by scheduling in one TTI from different types of MeNB and SeNB simultaneously bit size can be increased.

In one embodiment, when dual connectivity is configured within the same UE category, a configuration for increasing the UL-SCH bit size can be added to the same category. As another embodiment, a UE category may be defined to support the case where dual connectivity is configured. Alternatively, if dual connectivity is configured in another embodiment, the UE can change the UL-SCH bit size to a predetermined size. For example, in a state where dual connectivity is set, the UE can be configured to increase the UL-SCH bit size by a factor of two or a preset multiple.

16 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment B-2 of the present invention. The UE 1001 has information on the maximum transmittable UL-SCH (S1610). If the UE 1001 has dual connectivity (S1620), the maximum transmittable UL-SCH size is increased by a predetermined size (S1630). The range that can be increased can be set in advance. The UE 1001 may increase the size of the maximum transmittable UL-SCH preset in advance to double in the dual connectivity situation. This increase can be made without further instructions from the base station 1009. [ On the other hand, if the dual connectivity situation is terminated (S1640), the terminal 1001 can restore the maximum transmittable UL-SCH setting set in the step S1610 (S1650).

As an example B-3, scheduling information can be exchanged between MeNB and SeNB. Under Dual Connectivity, independent scheduling can be performed by MeNB and SeNB, and the MeNB and SeNB exchange related scheduling information with each other through X2, so that no error case occurs. Since the scheduling from MeNB and SeNB is dynamically set to the subframe level, only the information exchanged between the MeNB and the SeNB through the X2 interface or the feedback channel and feedback between the terminals performing the dual connectivity with the information through the X2 interface, (E.g., HARQ-ACK / NACK, CSI, UCI (uplink control information)) and feedback channel and feedback information (e.g., HARQ-ACK / NACK, CSI, UCI) between the UE and the SeNB, ), It is possible to dynamically adjust the ratio of the size of the maximum UL-SCH bits that can be transmitted per TTI by the UE to the different base stations MeNB and SeNB at the subframe level.

Or non-ideal backhaul, the exchange of information between MeNB and SeNB over the corresponding X2 interface may have a latency. In this case, there may be a time limit to utilize as scheduling information to be scheduled dynamically, i.e., at a subframe level. Therefore, in a time unit in which RRC setting is performed semi-staticly, A method of adjusting the ratio of the maximum number of bits of the UL-SCH that the UE can transmit per TTI to the SeNB may be considered. As one embodiment of the range of the time unit, for example, the X ms level can be set in the range of the time unit. The time unit can be set so that X is 100 ms or a multiple of 100 ms, or 200 ms, multiple of 200 ms, or 320 ms or multiple of 320 ms.

17 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of B-3 of the present invention. Scheduling information is exchanged between the two base stations 1009a and 1009b connected to the dual connectivity through a separate interface such as X2 (S1710). Then, the two base stations 1009a and 1009b schedule the UEs in the dual connectivity state to a maximum transmittable UL-SCH size set in step S1710 and provide scheduling information to the UEs in steps S1720a and S1720b. In the process of exchanging the scheduling information, the base station 1009a and 1009b can also determine the ratio of the UL-SCH range that the UE can transmit. In addition, if no delay time occurs in the information exchange between the base stations 1009a and 1009b in this process, the scheduling can be dynamically performed dynamically, that is, at the subframe level as described above. In this process, each of the base stations 1009a and 1009b can adjust the ratio of the maximum UL-SCH using the feedback channel and information with the terminal. The transmission of the scheduling information in a semi-static manner is a case where a delay time occurs in exchanging the scheduling information between the base stations 1009a and 1009b as described above. In this case, the range of the time unit according to the RRC setting The ratio of the maximum UL-SCH can be adjusted. If the time range is 200 ms, for example, the scheduling information and the ratio of the UL-SCH may be determined between the base stations 1009a and 1009b during the first 200 ms interval, and then applied for 200 ms. Also, when the maximum UL-SCH ratio and scheduling information are determined, each of the base stations 1009a and 1009b can transmit data in the downlink within a range that the corresponding base station can transmit until another change occurs .

The BSs 1009a and 1009b and the MS 1001 transmit data in the uplink according to the ratio of the scheduled information and the UL-SCH between the BSs 1009a and 1009b (S1730a and S1730b).

In step B-4, the UE determines that all or some of the received scheduling information is invalid, or selects only one of the scheduling information as valid. For example, when the UE is scheduled to perform more than the maximum number of UL-SCH transmission bits that the UE can transmit for the UL-SCH transmission from the MeNB and the SeNB, the UE determines that all of the scheduling information And can drop both of them.

Alternatively, the UE may determine that one of the scheduling information received from the two Node Bs is valid and drop only one of the scheduling information. In this case, a criterion or rule for determining what scheduling information to drop may be defined.

In one embodiment, the UL-SCH to be scheduled in a specific type of eNB may be prioritized. As one example, considering that a RRC connection under dual connectivity is established and maintained from the MeNB, the UL-SCH transmitted to the MeNB by the UE may be more important than the UL-SCH transmitted to the SeNB In this case, it is possible to determine that the scheduling information on the UL = SCH received from the MeNB is valid. That is, if scheduling of the maximum UL-SCH bit size is simultaneously performed within one TTI from the different eNBs, the UE determines that only the scheduling information on the UL-SCH received from the base station to which the RRC connection is established, for example, MeNB, is valid The UL-SCH can be transmitted to the MeNB based on the scheduling information received from the MeNB. Of course, in a situation where an RRC connection is established and maintained between the UE and the SeNB, it is determined that the UL-SCH to be transmitted to the SeNB is more important, and only the scheduling information on the UL-SCH received from the SeNB is determined to be valid, The UL-SCH can be transmitted to the SeNB based on the information.

As another embodiment, the priority can be determined according to the scheduling information to be transmitted to the UL-SCH. That is, in case of UL-SCH transmission in which the normal uplink data transmission is the lowest priority and other types of information are included, it is possible to set a higher priority in the UL-SCH for the MeNB or SeNB receiving the information . An example of a UL-SCH including other types of information is a transmission of a UL-SCH including an uplink UCI. In addition, when a terminal transmits system information, paging information, information used for an access procedure (eg, random message-3, etc.), the information including the above-mentioned information in MeNB or SeNB It is determined that the UL-SCH has a higher priority, that is, the UL-SCH is preferentially determined, the corresponding scheduling information is determined to be valid, and the UL-SCH is transmitted to the MeNB or the SeNB.

18 is a diagram illustrating a process of a base station and a terminal operating according to an embodiment of B-4 of the present invention. In the case of scheduling to transmit at least the maximum UL-SCH size for the maximum UL-SCH transmission from the base stations 1009a and 1009b (S1810a, S1810b), the terminal can select one of them. That is, a specific base station may be selected according to a preset reference, and it may be determined that only the scheduling for the UL-SCH received from any one base station is valid, and the corresponding base station may be selected (S1820). Only scheduling information allocated from a particular type of base station can be determined to be valid to select valid scheduling information. In another embodiment, the scheduling information associated with a particular data transfer may be determined to be valid. As described above, according to the above-described criteria, the UE 1001 firstly determines the UL-SCH based on the specific scheduling information and transmits data in the uplink (S1820).

The embodiments of A-1 to A-4 in the downlink and the embodiments of Figs. 11 to 14 and B-1 to B-4 in the uplink and the embodiments of Figs. 15 to 18 provide the UE with scheduling information Lt; RTI ID = 0.0 > enabled. ≪ / RTI > In summary, in a downlink or uplink, a UE may have scheduling information that can be assigned in advance on the uplink / downlink. And can operate normally within a range not exceeding the maximum DL-SCH or the maximum UL-SCH based on this. Also, in the dual connectivity situation, the terminal can operate normally by increasing the size of the maximum DL-SCH or the maximum UL-SCH. In another embodiment, the UE receives scheduling information from both base stations either dynamically or semi-statically in a dual connectivity state. At this time, both base stations can exchange scheduling information for the UE separately. In another embodiment, in a dual connectivity state, a UE may transmit or receive data by focusing on scheduling information with respect to a base station selected by a predetermined criterion for scheduling exceeding a maximum DL-SCH or a maximum UL-SCH size .

Under the dual connectivity, when the UE receives scheduling information of more than the maximum number of DL-SCH bits that can be received by the UE from different MeNBs and SeNBs per TTI or defines the operation of the UE when receiving scheduling, It is possible to solve processing ambiguity in a mobile station that may occur due to a terminal operation that is not defined in response to a reception in a mobile station that is performed according to scheduling from another base station, It is possible to prevent the downlink data loss rate due to the persistent retransmission, thereby increasing the data transmission rate of the uplink / downlink.

Under the dual connectivity, when the UE receives scheduling information of a maximum number of UL-SCH bits that can be transmitted per TTI from different MeNBs and SeNBs, or when scheduling is performed, It is possible to solve the processing ambiguity in the UE which may occur due to the terminal reception of the scheduling information of the UL-SCH scheduled by the base station and the terminal operation for the UL-SCH transmission in the terminal is not defined thereby, It is possible to prevent an uplink data loss rate due to continuous retransmission to different base stations by non-scheduling, thereby increasing the uplink / downlink data rate.

FIG. 19 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment of the present invention. Referring to FIG. The terminal may implement the embodiments of FIGS. 11 to 18 independently, or may be implemented by combining the embodiments. Figure 19 focuses on embodiments of A-4 and B-4. In setting the scheduling in the uplink and the downlink with the first base station or the second base station, the UE may apply the specific scheduling information as described in A-4 and B-4. In more detail, the terminal configures the dual connectivity with the first base station and the second base station (S1910). Then, the UE receives scheduling information for uplink transmission or scheduling information for downlink reception. In more detail, the terminal receives the scheduling information from the first base station or the second base station (S1920). If the received scheduling information exceeds the maximum data size set in the mobile station, for example, exceeds the maximum transmission data size in the uplink or the maximum received data size in the downlink (S1930) It is determined that only the scheduling information of one base station or the second base station is valid, and the valid scheduling information is applied to uplink transmission or downlink reception (S1940). If not, the scheduling information is applied to uplink transmission or downlink reception as in S1935. One embodiment of the maximum transmission data on the uplink is the number of UL-SCH bits that can be transmitted at maximum per TTI. One embodiment of maximum received data in the downlink is the maximum number of DL-SCH bits that can be received per TTI.

S1940 in more detail. In FIG. 14 for downlink and FIG. 18 for uplink, a criterion for selecting a scheduling information of a specific base station as a valid one is shown in FIG. 18. In more detail, as shown in the embodiments of A-4 and B-4, the UE can apply the scheduling information received from the RRC-connected base station of the first base station or the second base station to uplink transmission or downlink reception have. In another embodiment, the UE can apply the scheduling information related to transmission or reception of the corresponding data to the uplink transmission or the downlink reception based on the priority of the data to be transmitted in the uplink or the downlink.

On the other hand, independently of the step S1940, it is possible to increase the maximum transmission data size or the maximum reception data size in the dual connectivity state as described in A-2 and B-2. That is, after configuring the dual connectivity, the UE increases the maximum data size that can be transmitted in the uplink or the maximum data size that can be received in the downlink from the first base station or the second base station by a preset size, Can be prevented from occurring.

20 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention. The base station may implement the embodiments of FIGS. 11 to 18 independently, or may be implemented by combining the embodiments. Figure 20 focuses on embodiments of A-3 and B-3. The first base station will be mainly described, and a process of setting the scheduling in the uplink and the downlink by the first base station will be described. The second base station and the first base station constituting the dual connectivity with the MS exchange scheduling information about the MS (S2010). 13 and 17, both BSs can exchange scheduling information using a separate interface such as an X2 interface. The first base station then transmits scheduling information on data to be transmitted on the uplink or data to be received on the downlink to the mobile station on the basis of the exchanged information (S2020), and then, based on the transmitted scheduling information And performs uplink and downlink scheduling. In this process, S2020 may be performed within the subframe level or the RRC setting range. That is, the first base station can transmit the scheduling information to the mobile station according to the interval of the subframe level. Or the first base station may transmit to the terminal according to the interval within the RRC setting range.

On the other hand, when A-4 and B-4 are applied independently of S2020, the UE may have the scheduling information received from the first base station and the second base station exceed the size of the maximum transmission data or the size of the maximum reception data . In this case, the UE can apply the scheduling information of either the first base station or the second base station to uplink transmission or downlink reception.

In addition, independently of the step S2020, the first base station or the second base station can operate as considering the increase of the maximum transmission data size or the maximum reception data size under the dual connectivity as described in A-2 and B-2 . More specifically, when the maximum data size that can be transmitted in the uplink or the downlink between the terminal and the first base station and the second base station is set to be larger than the maximum data size in the case where the terminal is in a single connected state, The base station and the second base station can schedule by applying an increased data size over a single connection state.

FIG. 21 is a diagram illustrating a configuration of a base station according to another embodiment.

21, a base station 2100 according to another embodiment includes a control unit 2110, a transmitting unit 2120, and a receiving unit 2130.

The control unit 2110 receives the scheduling information of the number of DL-SCH bits that can be received by the UE from the different MeNBs and SeNBs per TTI, as a downlink case under the dual connectivity necessary for carrying out the present invention described above, And controls the overall operation of the base station according to control of the operation of the terminal when receiving the scheduling.

In addition, the control unit 2110 may transmit scheduling information equal to or greater than the number of UL-SCH bits that can be transmitted per TTI from the different MeNBs and SeNBs to the base station in the case of uplink under the dual connectivity required to perform the above- And controls the overall operation of the base station to control the operation of the terminal when receiving or scheduling. 11 to 18 and 20 can be performed by the base station 2100 of FIG.

The transmitting unit 2120 and the receiving unit 2130 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal. We will focus on the embodiments of A-3 and B-3 in more detail. The base station 2100 establishes scheduling in the uplink and downlink with the UE. The controller 2110 may exchange scheduling information for the UE with the second base station configuring the dual connectivity with the UE. In this case, the control unit 2110 can exchange scheduling information with another second base station using a separate interface different from the above-described transmitting unit 2120 and the receiving unit 2130, for example, the X2 interface. The control unit 2110 can control the transmission unit 2120 to transmit the scheduling information on data to be transmitted on the uplink or the downlink on the basis of the exchanged information.

In this process, the control unit 2110 can control the transmitting unit 2120 such that the transmitting unit 2120 transmits the scheduling information to the mobile station according to the interval of the subframe level or the interval within the RRC setting range. A-2 and B-2, the maximum data size that can be transmitted in the uplink or the downlink between the terminal and the base station 2100 is set in advance so as to be larger than the maximum data size when the terminal is in a single connection state And the control unit 2110 can generate the scheduling information according to the increased size.

22 is a diagram illustrating a configuration of a user terminal according to another embodiment.

22, a user terminal 2200 according to another embodiment includes a receiving unit 2230, a control unit 2210, and a transmitting unit 2220.

The receiving unit 2230 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the control unit 2210 receives scheduling information of more than DL-SCH bits that can be received by the UE from different MeNBs and SeNBs per TTI under the dual connectivity required for performing the above-described present invention , And controls the overall operation of the terminal according to receiving the scheduling.

In addition, the control unit 2210 may transmit scheduling information that is equal to or greater than the number of UL-SCH bits that can be transmitted per TTI from a different MeNB and SeNB to a base station under the dual connectivity required for performing the above- And controls the overall operation of the terminal according to reception or scheduling.

The transmitter 2220 transmits uplink control information, data, and a message to the base station through the corresponding channel. The terminal 2200 of FIG. 22 can perform the operations shown in FIGS. 11 to 19 above.

In more detail, we will focus on A-4 and B-4. The UE 2200 can establish scheduling in the uplink and the downlink with the first base station or the second base station. The controller 2210 configures dual connectivity with the first base station and the second base station. The receiver 2230 receives the scheduling information for uplink transmission or downlink reception from the first base station or the second base station. If the received scheduling information exceeds the size of the maximum transmission data or the size of the maximum received data, the controller 2210 applies the scheduling information of either the first base station or the second base station to uplink transmission or downlink reception . In more detail, the control unit 2210 may control the transmitting unit 2220 or the receiving unit 2230 to apply the scheduling information received from the RRC-connected base station, either the first base station or the second base station, to the uplink transmission or the downlink reception have. In another embodiment, the control unit 2210 controls the transmission unit 2220 to apply scheduling information related to transmission or reception of the corresponding data to uplink transmission or downlink reception based on the priority of data to be transmitted in the uplink or downlink, ) Or the receiving unit 2230. [ As shown in A-2 and B-2, after configuring the dual connectivity, the controller 2210 determines the maximum data size that can be transmitted in the uplink from the first base station or the second base station, The data size can be increased.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

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

Claims (16)

A method for establishing a scheduling in an uplink and a downlink with a first base station or a second base station,
Establishing a dual connectivity with the first base station and the second base station;
Receiving the scheduling information for uplink transmission or the scheduling information for downlink reception from the first base station or the second base station; And
When the scheduling information exceeds the size of the maximum transmission data or the size of the maximum reception data, the UE applies the scheduling information of either the first base station or the second base station to uplink transmission or downlink reception ≪ / RTI > The method according to claim 1,
The applying step
Wherein the UE applies the scheduling information received from the RRC-connected base station among the first base station or the second base station to the uplink transmission or the downlink reception. The method according to claim 1,
The applying step
Wherein the scheduling information related to the transmission or reception of the data is applied to the uplink transmission or the downlink reception based on the priority of the data to be transmitted in the uplink or the data to be received in the downlink. The method according to claim 1,
After the step of configuring the dual connectivity,
Further comprising increasing the maximum data size that can be transmitted in the uplink or the maximum data size that can be received in the downlink from the first base station or the second base station. A method for establishing scheduling in an uplink and a downlink with a first base station,
Exchanging scheduling information for the MS with a second BS and a first BS configuring dual connectivity with the MS; And
And transmitting, by the first base station, the scheduling information on data to be transmitted on the uplink or the data to be received on the downlink based on the exchanged information. 6. The method of claim 5,
The transmitting step
Further comprising the step of the first base station transmitting the scheduling information to the terminal according to an interval in a subframe level interval or an interval in an RRC setting range. The method according to claim 6,
When the scheduling information received from the first base station and the second base station exceeds the size of the maximum transmission data or the size of the maximum reception data, the scheduling information transmitted by the first base station or the second base station Wherein only one scheduling information is applied to uplink transmission or downlink reception. The method according to claim 6,
Wherein the maximum data size that can be transmitted in the uplink or the downlink between the terminal and the first base station is greater than the maximum data size in a state where the terminal is not dual connected. A terminal for establishing scheduling in an uplink and a downlink with a first base station or a second base station,
A controller configured to form dual connectivity with the first base station and the second base station; And
And a receiving unit for receiving scheduling information for uplink transmission or scheduling information for downlink reception from the first base station or the second base station,
The control unit may be configured to transmit scheduling information of either the first base station or the second base station to the terminal for applying uplink transmission or downlink reception when the scheduling information exceeds the size of the maximum transmission data or the size of the maximum reception data. . 10. The method of claim 9,
Wherein the controller applies the scheduling information received from the RRC-connected base station among the first base station or the second base station to uplink transmission or downlink reception. 10. The method of claim 9,
Wherein the controller applies scheduling information related to transmission or reception of the data based on a priority of data to be transmitted in the uplink or data to be received in the downlink to uplink transmission or downlink reception. 10. The method of claim 9,
Wherein the controller increases the maximum data size that can be transmitted on the uplink or the maximum data size that can be received on the downlink from the first base station or the second base station after configuring the dual connectivity. 1. A first base station for establishing scheduling in an uplink and a downlink,
A transmitter for transmitting data to the terminal;
A receiver for receiving data with the terminal; And
A second base station configuring dual connectivity with the terminal, and a controller for exchanging scheduling information for the terminal and controlling the transmitter and the receiver,
And the control unit controls the transmission unit to transmit scheduling information on data to be transmitted on the uplink or data to be received on the downlink based on the exchanged information. 14. The method of claim 13,
Wherein the transmitter transmits the scheduling information to the UE according to an interval of a subframe level or an interval within an RRC setting range. 14. The method of claim 13,
When the scheduling information received from the first base station and the second base station exceeds the size of the maximum transmission data or the size of the maximum reception data, the scheduling information transmitted by the first base station or the second base station Wherein only one scheduling information is applied to uplink transmission or downlink reception. 14. The method of claim 13,
Wherein a maximum data size that can be transmitted in the uplink or downlink between the mobile station and the first base station is greater than a maximum data size in the case where the mobile station is in a single connected state.

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