KR20140120249A - Method for transmitting and receiving downlink control channel and the apparatus - Google Patents

Abstract

The present invention relates to a method to transmit and receive a downlink control channel and a device thereof. According to an embodiment of the present invention, the method to receive a downlink control channel includes: a step in which a terminal receives a downlink signal including a downlink control channel including instruction information which a type of scheduling is signaled; and a step in which one among a plurality of TTI, a plurality of subframe scheduling, or cross subframe scheduling is executed in accordance to the instruction information.

Description

[0001] The present invention relates to a method and apparatus for transmitting and receiving downlink control channels,

The present invention relates to a method and apparatus for transmitting and receiving a downlink control channel and, more particularly, to a technique for transmitting and receiving a downlink control channel between a base station and a terminal for instructing scheduling of multiple subframes under a multi- to be.

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. The current mobile communication system such as LTE (Long Term Evolution) and LTE-Advanced of the 3GPP series is a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data beyond voice- It is required to develop a technique capable of transmitting large-capacity data in accordance with the above-described method. On the other hand, since the conventional single cell method can not be applied in transmitting uplink and reference signals in a plurality of cells or a small cell, a new technique and a method are needed.

The present invention allows a base station to instruct the terminal to perform multiple sub-frame scheduling, multiple TTI scheduling, or cross sub-frame scheduling, and maintains the operation of the legacy terminal by not changing the current signal or channel structure.

A method for receiving a downlink control channel according to an embodiment of the present invention includes receiving a downlink signal including a downlink control channel including indication information for signaling a kind of scheduling from the base station, And performing one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling according to the indication information.

A method for transmitting a downlink control channel according to another exemplary embodiment of the present invention includes generating a downlink control channel including indication information for signaling a type of scheduling, Wherein the indication information indicates one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling.

According to another aspect of the present invention, a terminal includes a transmitter for transmitting a signal to a base station, a receiver for receiving a downlink signal including a downlink control channel including indication information for signaling a kind of scheduling from the base station, And receives a downlink control channel including a controller for performing one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling according to the direction information.

A base station according to another embodiment of the present invention includes a receiver for receiving a signal from a UE, a controller for generating a downlink control channel including indication information for signaling a type of scheduling, And a transmitter for transmitting the downlink control signal in a downlink signal, the indication information indicating one of multiple TTI, multiple subframe scheduling or cross subframe scheduling.

When the present invention is applied, the UE can perform multiple sub-frame scheduling, multiple TTI scheduling, or cross sub-frame scheduling according to an instruction from the BS. In particular, a UE belonging to a small cell environment or an arbitrary cell / base station / RRH / antenna / RU can perform multi-sub-frame scheduling, multi-TTI scheduling or cross sub-frame scheduling to improve data throughput.

1 is a view showing a small cell development according to an embodiment.
2 is a diagram showing a small cell deployment scenario.
Figure 3 is a diagram showing a detailed scenario in the small cell deployment.
4 is a diagram illustrating a control region for transmitting a downlink control channel.
5 is a diagram illustrating transmission of a control channel in one subframe.
6 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.
7 is a diagram illustrating an operation of a base station according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.
FIG. 9 is a diagram illustrating a configuration of a base station 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. Hereinafter, the user terminal may be referred to as a terminal in the present specification. Hereinafter, the user terminal may be referred to as a terminal in the present specification.

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), a transmission point (TP), a reception point It can be called another term.

In this specification, a base station or a cell should be interpreted in a generic sense to indicate a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) , Coverage of various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU 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) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) 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 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 megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

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, OFDM- 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 downlink transmit control information through a control channel such as 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 And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like. On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

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

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

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

Hereinafter, a downlink refers to a communication or communication path from a multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex 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, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

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

The physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH. For convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH.

In addition, the High Layer Signaling described herein includes RRC signaling for transmitting RRC information including RRC parameters.

An eNB, which is an embodiment of a base station, performs downlink transmission to terminals. 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.

At this time, as described below with reference to the drawings, the first UE1 transmits the uplink signal to the eNB and the second UE transmits the uplink signal to the RRH.

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.

Figure 3 is a diagram showing a detailed scenario in the small cell deployment.

The solid lines connecting the small cells in the small cells 312, 322, 332, and 342 refer to 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.

310 shows the small cell deployment scenario # 1. 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.

And 320 a 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 321 and the small cells are outdoors and 322 indicates a small cell cluster. Users are distributed both indoors / outdoors.

And 330 a 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 331 is outdoors, the small cells are all indoor, and 332 indicates a small cell cluster. Users are distributed both indoors / outdoors.

And 340 a small cell deployment scenario # 3. Scenario 3 is an indoor small cell scenario with no coverage of macros. 342 designates a small cell cluster. In addition, the small cells are all indoor and users are dispersed both indoors and outdoors.

Hereinafter, the downlink PDCCH and the DCI format will be described. 4 is a diagram illustrating a control region for transmitting a downlink control channel. In FIG. 4, the control region 410 includes transmission of PHICH, PCFICH, and PDCCH. The control area may be composed of 1 to 3 OFDM symbols (1 to 3 OFDM symbols), but the present invention is not limited to this, and the control area may be increased or decreased depending on the situation of the system. Here, the PDCCH is allocated and transmitted evenly over the area excluding the resources in which PHICH and PCFICH are used, to the number of OFDM symbols to which the PDCCH indicated by the PCFICH is transmitted. Control signaling and cell-specific reference symbols are distributed in sub-frames.

5 is a diagram showing transmission of a control channel (control region for transmitting a control channel) in one subframe.

510 and 520 are examples of transmission of a PDSCH indicated by a control channel transmitted in every subframe upon transmission of a PDSCH on multiple carriers. CC # 1, # 2, and # 3 of the first, second, and third subcarriers 510 and 520 denote a first element carrier, a second element carrier, and a third element carrier, respectively. FIG. 5 is a diagram illustrating transmission of a PDSCH indicated by a control channel transmitted in each subframe upon transmission of a PDSCH on a multiple carrier. In FIG. 5, reference numeral 510 denotes an example in which no cross-carrier scheduling ), The carrier indicator is not included in the DCI (Downlink control information). The PDSCH 510 schedules the corresponding PDSCH by independently presenting a PDCCH in each carrier independently of each carrier in self carrier scheduling on multiple carriers. This results in data transmission in each carrier by a control channel transmitted in every subframe within a 1 ms subframe. 520 represents cross carrier scheduling on multiple carriers and includes a carrier indicator in the DCI. The PDSCH is scheduled to be able to be scheduled on a plurality of carriers in one carrier, and a PDSCH capable of transmitting PDCCHs existing on one carrier on a plurality of carriers is scheduled. In the embodiment 520 as well, data transmission in multiple carriers is performed by a control channel transmitted in every subframe in a 1 ms subframe as in the case of 510.

Table 1 is a DCI format, which means a scheduling grant for uplink / downlink transmission. DCI formats are divided and transmitted according to each uplink / downlink transmission method and usage.

DCI format size
(size) Usage Uplink Grant
(Uplink grant) Downlink allocation
(Downlink Assignment) Power control
(Power
Control) littleness
(small)



...












greatness
(Large) - 1C Compact allocation for specific purposes
(Special purpose compact assignment) - 0 Single layer
(single layer) 1A Sequential assignment only
(Continuous allocations only) 3, 3A - 1B Codebook based beamforming using CRS
(Codebook-based beam-forming using CRS) - - 1D Multi-user MIMO using CRS
(Multi-user MIMO using CRS) - 4 Spatial multiplexing
(spatial multiplexing) - - - One Flexible allocations - - 2A Open Loop Spatial Multiplexing Using CRS
(Open-loop spatial multiplexing using CRS) - - 2B Dual layer transmission using DM-RS
(Dual-layer transmission using DM-RS) - - 2C Multi-layer transmission using DM-RS
(Multi-layer transmission using DM-RS) - - 2 Closed Loop Spatial Multiplexing Using CRS
(Closed-loop spatial multiplexing using CRS) -

From the conventional technology, when transmitting a control signal for downlink transmission received by a UE belonging to any cell / base station / RRH / antenna / RU or a small cell and uplink transmission to be transmitted by a mobile station, uplink / downlink scheduling information The transmission of the PDCCH / EPDCCH including the control signal having the control signal having the control signal is required to be transmitted by a predetermined number of symbols (eg, 1 symbol to 4 OFDM symbols) in every subframe, It is possible to reduce the data rate. Accordingly, a method for scheduling multiple subframes is required, and a method of transmitting scheduling information for performing transmission of multiple subframes is not defined. Accordingly, when transmitting a scheduling grant for uplink / downlink transmission to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment and a multiple sub-frame scheduling scheduling, multiple TTI scheduling, or cross sub-frame scheduling for the uplink / downlink transmission.

The present invention reduces a data rate of a certain ratio in the case of transmitting a control channel for each subframe transmitted to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment. The present invention relates to a method for supporting multi-subframe scheduling in a standard to reduce the transmission of control signals in order to improve the performance of a mobile station. More specifically, the present invention relates to a method for supporting multi- / Method for forwarding uplink / downlink transmission control signals for supporting multi-sub-frame scheduling, multi-TTI scheduling or cross sub-frame scheduling in uplink / downlink when transmitting a scheduling grant for downlink transmission .

When transmitting a scheduling grant for uplink / downlink transmission to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment and multiple cell environments, it is possible to perform uplink / downlink multiple subframe scheduling, multiple TTI scheduling, The present invention relates to a method of transmitting a control signal of an uplink / downlink transmission to support sub-frame scheduling, in which a terminal operates in a single sub-frame scheduling in a conventional macro base station, Frame scheduling to the UE or to allow the UE to transmit the multi-sub-frame scheduling. In addition, the present invention can be used in a deployment of small cells and any cell / base station / RRH / antenna / RU that can be deployed independently and coverage of macrocell / base station / RRH / antenna / Overlaid deployment also allows the terminal to support backwards compatability.

The present patent described below describes a method for transmitting a downlink control signal in a small cell environment and an apparatus thereof. A method of indicating scheduling information for each subframe in case of applying multiple TTI, multiple subframe scheduling or cross subframe scheduling to a small cell environment and an arbitrary cell / base station / RRH / antenna / RU should be considered . Therefore, the present invention proposes a signaling method for informing the corresponding scheduling information as follows. The methods herein can be considered as a method that can be applied to both upward and downward directions.

- Explicit signaling (direct signaling)

This is a method of adding 1 bit to the scheduling grant DCI indicating that multiple TTI, multiple subframe scheduling, or cross subframe scheduling is performed. In other words, a method of performing multiple TTI or multiple subframe scheduling by including UL DCI format 0, DCI format 4, or new DCI format, which is an uplink scheduling grant, in the uplink transmission. A 1 bit indicating that multiple TTI, multiple subframe scheduling or cross subframe scheduling is performed in the DCI format 1a / 1b / 1c / 1d / 2 / 2b / 2c / 2d in the downlink DCI format Is proposed. The indicator may be 1 bit and multiple bits may be considered. A method of indicating that multiple sub-frame scheduling or cross sub-frame scheduling is performed using only a subset of some of the downlink DCI formats may be considered.

Alternatively, multiple RRC parameters may be set for multiple TTI, multiple sub-frame scheduling, or cross sub-frame scheduling, and multiple TTIs and multiple sub-frames may be multiplexed on the downlink and uplink DCI formats, A method of determining whether there are multiple bits of 1 bit or more indicating that frame scheduling or cross sub-frame scheduling is performed can be considered. The RRC may be information necessary for setting any one of multiple TTIs, multiple subframe scheduling, or cross subframe scheduling, and the necessary information may indicate the setting of any one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling It may also be information that

The RRC parameter may be considered as dedicated signaling for UE as an example, and another example may be considered as a method for setting to common signaling. In other words, it is possible to set the possibility of performing multiple TTI, multiple subframe scheduling, or cross subframe scheduling with common signaling according to the characteristics of a corresponding cell in an eNB or a cell belonging to a cell, A multi-TTI, a multiple sub-frame scheduling or a multi-sub-frame scheduling for PDSCH transmission and PUSCH transmission in accordance with multiple bits of 1 bit or more indicating that multi-TTI, multiple sub-frame scheduling or cross sub- Frame sub-frame scheduling may be applied.

Alternatively, a method of adding to an existing RRC parameter set as another example may be considered. For example, in a configuration for cross-carrier scheduling can be considered.

Also, a method of indicating the number of subframes for multiple TTI (or subframe) scheduling can be considered. This relates to a method of indicating the number of subframes in multi-TTI (or subframe) scheduling, Or the number of subframes to be used in each cell may be fixed, or a semi-static RRC may be used to indicate the number of subframes for scheduling multiple TTI (or subframe) May be considered. For example, there may be a case where the number of subframes is fixed to one, and a method of indicating one of the sets with the number of sets of subframes can be considered. If the number of subframes is indicated once, the number of continuously designated subframes is applied. If the number of subframes is newly designated, the number of indicated subframes can be reapplied.

Or dynamically indicate the number of subframes to be scheduled through the PDCCH / EPDCCH.

Another method that can be further considered includes a method of indicating the number of subframes for multi-TTI (or subframe) scheduling with semi-static RRC and a method of dynamically indicating the number of subframes used on the PDCCH / EPDCCH A mixed method that mixes methods that can be used can be considered. That is, the number of subframes for multi-TTI (or subframe) scheduling, which is semi-statically set to RRC, is designated as the maximum number of subframes, and the number of actually scheduled subframes through PDCCH / EPDCCH is defined as RRC This method is dependent on the maximum number of subframes. For example, when one of the sets related to the number of subframes set in the RRC is set to 4 or the number of fixed subframes is set to 4, the size of bits for indicating the number of subframes dynamically designated from the PDCCH / EPDCCH and to perform scheduling on the number of subframes according to the bit width. That is, when the bit size is set to 1 bit, one of the candidate groups of {1,4} can be designated. When the bit is set to 2 bits, {1,2,3,4} You may be able to direct one of the candidates. As another example, if the maximum number of subframes set by the RRC is set to 8, the number of subframes to be scheduled can be indicated as {1,2,4,8} when the bit size is 2 bits have. As a method of setting the maximum number of subframes to be dependent on the maximum number of subframes, a method of designating the number of subframes as a divisor of the maximum number of subframes can be considered. In another method, from one subframe to the maximum number of subframes Can be considered as a candidate group. In summary, in the hybrid scheme indicating the number of subframes, a range of the number of subframes included in the RRC parameter of the downlink channel included in the downlink channel or transmitted before transmission of the downlink channel is used as a reference Multiple TTIs, multiple subframe scheduling, or the number of subframes needed for cross subframe scheduling.

In performing multiple subframe (or TTI) scheduling and crossed subframe scheduling according to each explicit signaling, the scheduling of the corresponding multiple subframe may be fixedly fixed by consecutive multiple subframe scheduling, There may be a way to indicate whether the scheduling of multiple subframes is continuous or non-consecutive. In such a case, a method of indicating whether it is continuous or non-continuous (one example is a distinction between an even subframe and an odd subframe) should be considered. Therefore, explicit signaling of the bits to perform the indication may be considered, and the explicit signaling may be indicated with indicators for multiple subframe (or TTI) scheduling, and multiple subframes (or TTI ) It is also possible to consider a method of instructing it independently of the indicator for scheduling.

When the UE includes PDCCH or EPDCCH with multiple TTI, multiple sub-frame scheduling, or cross-subframe scheduling related indication information, the UE transmits the downlink and downlink control channels, that is, blind decoding of the PDCCH / EPDCCH, A procedure of a terminal for detecting a grant and an uplink grant will be described as follows.

In the case of including a multiple TTI, multiple sub-frame scheduling or cross sub-frame scheduling indication in the PDCCH or EPDCCH and a method of indicating a predefined RRC parameter via the RRC through 1 bit dynamic indication included in the PDCCH or EPDCCH, DCI format 1a that is a DL grant that contains downlink scheduling information for a corresponding UE in a UE dedicated search space rather than a common search space in a UE when detecting PDCCH / EPDCCH, And defines the operation of the UE to search DCI format 0, which is an UL grant containing scheduling information. In the case of the other DCI format, since the UE is searched in the UE dedicated search space rather than the UE common search space, the operation of the UE can be realized so as to be the same as the existing method. Therefore, after the Rel-12, the UE can set the UE to search for a grant including the downlink scheduling information and the uplink scheduling information in the dedicated UE search space at the time of performing the related operation.

- implicit (implicit) directive of relevant information as implicit signaling

In the case of performing PUSCH transmission in the uplink, when multi-subframe scheduling is performed, "intra and inter frequency hopping" or "inter-frequency hopping" for PUSCH transmission may be off. In the case of a single layer transmission using the uplink DCI format 0, since a frequency hopping flag is not necessary in such a case, a multi-TTI, a multi- Subframe scheduling or cross subframe scheduling may be considered. Or perform instructions for multi-TTI, multiple sub-frame scheduling, or cross-sub-frame scheduling using a code-point remaining in the information used in uplink DCI format 0 or 4. 1b / 1c / 1d / 2 / 2b / 2c / 2d as an implicit indication method for performing an instruction for multiple TTI, multiple subframe scheduling or cross subframe scheduling for downlink similarly to the uplink. A method of using remaining code points among the included information elements can be considered.

As another embodiment, it is an implicit signaling method applicable to both uplink and downlink. In the case of considering Carrier Aggregation (CA), CIF is used in a PDCCH / EPDCCH, and more specifically, uplink and downlink A carrier indicator is included in 0 or 3 bits in the DCI format 0/4 and the DCI format 1 / 1A / 1B / 1D / 2 / 2A / 2B / 2C / 2D, which are scheduling grants of the downlink. If CIF is not set for 0 bit, it means that the corresponding cross carrier scheduling can not be used. If CIF is set, crossbar scheduling is enabled with 3 bits. In the case of CAs up to Rel-11, the number of component carriers that can be supported by the standard is limited to five uplinks and five uplinks. The number of cases that can be indicated by 3 bits as a carrier indicator can indicate 8 to the element carriers 0 to 7. However, since only five of the uplink and the downlink supported in the current standard are supported, There are three remaining code points when CIF is set. Therefore, the present method can be considered as a method of using multi-sub-frame scheduling or multi-TTI scheduling or signaling for cross sub-frame scheduling while performing self-carrier scheduling in this case. That is, when CIF is set, the value of 0-4 indicated by the carrier indicator is used for cross-carrier scheduling, and for the value of 5-7 that the remaining carrier indicator can have, multi-subframe scheduling or multi-TTI scheduling or cross To be used for signaling for subframe scheduling. This can be considered as a method which is mainly applicable in a scenario in which CA is enabled by adding a carrier in a small cell to a macro cell carrier under various scenarios of the small cell described in the background of the present invention , It is possible to apply the technology even under other scenarios.

When performing multiple subframe (or TTI) scheduling and cross subframe scheduling according to implicit signaling, the scheduling of the corresponding multiple subframe can always be fixed by continuous multiple subframe scheduling, and the scheduling of the corresponding multiple subframe Explicit / implicit signaling can be further considered as a way to indicate whether it is continuous or non-continuous. This may be a method of indicating whether it is continuous or non-continuous (one example is the division of an even subframe and an odd subframe). Therefore, explicit signaling of the bits to perform the indication may be considered, and the explicit signaling may be indicated with indicators for multiple subframe (or TTI) scheduling, and multiple subframes (or TTI ) It is also possible to consider a method of instructing it independently of the indicator for scheduling. Implicit signaling can be considered to indicate whether the scheduling of multiple subframes is continuous or discontinuous. There may be a method of using code points on the DCI format. In one specific embodiment, code points for consecutive subframes and code points for discontinuous subframes, among three code points remaining in the CIF, A method of separately specifying and designating one can be considered.

The UE can control the resource allocation flexibility with respect to the amount of data to be transmitted by the base station at the same time unit as the frequency unit, thereby improving the UE experience due to the increase of the data traffic. Also, by reducing the overhead of the downlink control channel PDCCH / EPDCCH for allocating the scheduling grant when the UE receives / transmits the uplink PDSCH / PUSCH for each subframe, the data throughput for the uplink / downlink can be improved have. When transmitting a scheduling grant for uplink / downlink transmission to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment and a downlink subframe scheduling, a multi TTI scheduling or a cross subframe A process of transmitting and receiving a downlink control signal for transmitting a control signal of uplink / downlink transmission to support scheduling between a base station and a mobile station will be described.

6 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.

In step S610, the MS receives a downlink signal including a downlink control channel including indication information for signaling the type of scheduling, from the BS. In step S620, the UE performs multiple TTI, multiple subframe scheduling, or cross subframe scheduling according to the instruction information. The meaning of performing scheduling means to control transmission and reception of signals according to scheduling. As described above in the explicit signaling, the DCI format of the control channel may include the instruction information having a size of 1 bit or more. In this case, the terminal can search DCI format 0 or DCI format 1a in the dedicated search space of the terminal. Also, the DCI includes indication information having a size of 1 bit or more, and the downlink signal includes an RRC (Radio Resource Control) parameter including information necessary for setting either one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling can do. Meanwhile, the RRC parameter included in the indication information or the downlink signal may include information indicating the number of subframes necessary for multi-TTI, multiple subframe scheduling, or cross subframe scheduling. In a hybrid scheme, the number of subframes When the UE is instructed, the UE determines whether the indication information is included in the downlink signal or based on a range of the number of subframes included in the RRC parameter of the downlink signal received before the reception of the downlink signal, The number of subframes required for subframe scheduling or cross subframe scheduling can be confirmed.

In the implicit signaling, if frequency hopping in the uplink signal is inactivated, a frequency hopping flag of the downlink signal may include the indication information, and the downlink control channel may include a remaining code in the DCI format The point information may be included in the point. With respect to the use of the CIF, the downlink control channel may include any one of values 5, 6, and 7 of the CIF field as the indication information. In order to indicate continuity of a subframe, the downlink signal includes a continuity information of a plurality of subframes in the multi-TTI, multiple subframe scheduling or cross subframe scheduling, And in another way the indication information or the second indication information may use a code point on the DCI format or a code point on the CIF.

7 is a diagram illustrating an operation of a base station according to an embodiment of the present invention.

The base station generates a downlink control channel including indication information for signaling the kind of scheduling (S710), and transmits the generated downlink control channel to the terminal by including the generated downlink control signal in the downlink signal (S720). Wherein the indication information indicates one of multiple TTI, multiple subframe scheduling, or crossed subframe scheduling.

As described in the above explicit signaling, the base station includes the indication information having a size of 1 bit or more in the DCI format when generating the downlink signal. In the DCI format, DCI format 0 or DCI format 1a is included in the dedicated search space of the terminal so that the terminal can search in the dedicated search space. In addition, the BS may include detailed information through the RRC. The BS may include indication information having a size of 1 bit or more in the DCI when generating the downlink, and may include scheduling of multiple TTI, multiple subframe scheduling, or cross subframe scheduling And a Radio Resource Control (RRC) parameter including information necessary for setting either one. When generating a downlink signal to indicate the number of subframes, the RRC parameter included in the indication information or the downlink signal indicates the number of subframes required for multi-TTI, multiple subframe scheduling, or cross subframe scheduling May be included. Also, in order to indicate in a hybrid scheme, if the indication information is included in the RLC parameter of the downlink signal included in the downlink signal or before transmission of the downlink signal, A downlink signal may be generated to indicate the number of subframes required for multi-subframe scheduling or cross subframe scheduling.

The base station may include the indication information in a frequency hopping flag when the frequency hopping in the uplink signal is inactivated when the downlink signal is generated in a detailed implementation scheme of the implicit signaling. The instruction information may be included in the remaining code points of the DCI format. Also, the base station can generate the downlink signal using the CIF so that the value of any one of 5, 6, and 7 of the CIF field is the indication information. In order to indicate the continuity of the subframe, the base station transmits a downlink signal to the mobile station in such a manner that a second indication distinguished from the indication information or the indication information is a continuous indication of a plurality of subframes in the multiple TTI, multiple subframe scheduling or cross subframe scheduling The indicator information or the second indication information may use the code point on the DCI format or the code point of the CIF.

The present invention relates to a method for transmitting a downlink control signal for a small cell and a cell / base station / RRH / antenna / RU under a multi-layer cell structure, more specifically, A method for transmitting a base station to a mobile station has been described. Hereinafter, a terminal apparatus using the method and a base station apparatus for transmitting the scheduling information will be described.

FIG. 8 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

8, a user terminal 800 according to another embodiment includes a receiving unit 830, a control unit 810, and a transmitting unit 820.

The receiving unit 830 receives downlink control information, data, and a message from the base station through the corresponding channel.

Also, when transmitting the scheduling grant for uplink / downlink transmission to the UEs belonging to any cell / base station / RRH / antenna / RU in the small cell environment required for performing the above-described present invention, And controls transmission / reception of control signals of uplink / downlink transmission to support multi-sub-frame scheduling, multi-TTI scheduling or cross sub-frame scheduling of the link.

The transmitter 820 transmits uplink control information, data, and a message to the base station through the corresponding channel. In more detail, the receiver 830 receives a downlink signal including a downlink control channel including indication information for signaling the type of scheduling from the base station, and the controller 810 controls the TTI, And performs either multi-sub-frame scheduling or cross-sub-frame scheduling. The meaning of performing scheduling means to control transmission and reception of signals according to scheduling.

As described above in the explicit signaling, the DCI format of the control channel may include the instruction information having a size of 1 bit or more. In this case, the controller 810 may search the DCI format 0 or the DCI format 1a in the dedicated search space of the terminal. Also, the DCI includes indication information having a size of 1 bit or more, and the downlink signal includes an RRC (Radio Resource Control) parameter including information necessary for setting either one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling can do. Meanwhile, the RRC parameter included in the indication information or the downlink signal may include information indicating the number of subframes necessary for multi-TTI, multiple subframe scheduling, or cross subframe scheduling. In a hybrid scheme, the number of subframes If instructed, the controller 810 determines whether or not the indication information is included in the downlink signal or based on the range of the number of subframes included in the RRC parameter of the downlink signal received before the reception of the downlink signal, The number of subframes required for TTI, multiple subframe scheduling, or cross subframe scheduling can be confirmed.

In the implicit signaling, if frequency hopping in the uplink signal is inactivated, a frequency hopping flag of the downlink signal may include the indication information, and the downlink control channel may include a remaining code in the DCI format The point information may be included in the point. With respect to the use of the CIF, the downlink control channel may include any one of values 5, 6, and 7 of the CIF field as the indication information. In order to indicate the continuity of the subframe, the downlink signal includes a plurality of subframes of the multiple TTI, multiple subframe scheduling, or cross subframe scheduling, including a second indication distinguished from the indication information or the indication information And in another way the indication information or the second indication information may use a code point on the DCI format or a code point on the CIF.

FIG. 9 is a diagram illustrating a configuration of a base station according to another embodiment.

9, a base station 900 according to another embodiment includes a control unit 910, a transmission unit 920, and a reception unit 930.

When transmitting a scheduling grant for uplink / downlink transmission to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment and necessary for performing the above-described present invention, the controller 910 transmits uplink / downlink Downlink transmission control signal for supporting multi-sub-frame scheduling, multi-TTI scheduling, or cross-subframe scheduling of the base station.

The transmitting unit 920 and the receiving unit 930 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal. In more detail, the controller 910 generates a downlink control channel including indication information for signaling the type of scheduling, and the transmitter 920 includes the generated downlink control channel in the downlink signal to the terminal send. Here, the indication information indicates one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling.

As described in the above explicit signaling, the controller 910 includes the indication information having a size of 1 bit or more in the DCI format when generating the downlink signal. In the DCI format, DCI format 0 or DCI format 1a is included in the dedicated search space of the terminal so that the terminal can search in the dedicated search space. In addition, the control unit 910 may include detailed information through the RRC. When the downlink is generated, the control unit 910 may include indication information having a size of 1 bit or more in the DCI, and multiplex TTI, multiple subframe scheduling, And RRC (Radio Resource Control) parameters including information necessary for setting any one of frame scheduling. When the controller 910 generates the downlink signal, the RRC parameter included in the indication information or the downlink signal indicates the number of subframes required for multiple TTI, multiple subframe scheduling, or cross subframe scheduling. Information indicating the number can be included. Also, in order to indicate in a hybrid scheme, if the indication information is included in the RLC parameter of the downlink signal included in the downlink signal or before transmission of the downlink signal, A downlink signal may be generated to indicate the number of subframes required for multi-subframe scheduling or cross subframe scheduling.

The controller 910 may include the indication information in a frequency hopping flag when the frequency hopping in the uplink signal is inactivated when the downlink signal is generated in the detailed implementation method of the implicit signaling, In another embodiment, the instruction information may be included in the remaining code points of the DCI format. Also, using the CIF, the controller 910 may generate the downlink signal such that any one of values 5, 6, and 7 of the CIF field is the indication information. In order to indicate the continuity of the subframe, the controller 910 controls the downlink signal so that the second indication, which is distinguished from the indication information or the indication information, is transmitted to the plurality of subframes in the multiple TTI, multiple subframe scheduling or cross subframe scheduling, The direction information or the second direction information may use the code point on the DCI format or the code point of the CIF.

When the scheduling grant is transmitted for uplink / downlink transmission to a UE belonging to a cell / base station / RRH / antenna / RU in a small cell environment and an arbitrary cell environment, uplink / downlink multiple subframe scheduling, To a method and apparatus for transmitting and receiving a downlink control signal, i.e., a downlink control channel, for transmitting uplink / downlink transmission control signals for supporting TTI scheduling or cross sub frame scheduling.

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 (36)

A method for a UE to receive a downlink control channel,
Receiving, from a base station, a downlink signal including a downlink control channel including indication information for signaling a type of scheduling; And
Performing either one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling according to the indication information.
The method according to claim 1,
Wherein the DCI format of the control channel includes the indication information having a size of 1 bit or more.
3. The method of claim 2,
Wherein the terminal further comprises searching DCI format 0 or DCI format 1a in a dedicated search space of the terminal.
3. The method of claim 2,
The DCI includes indication information having a size of 1 bit or more, and the downlink signal includes a Radio Resource Control (RRC) parameter including information necessary for setting either of multiple TTI, multiple subframe scheduling, or cross subframe scheduling ≪ / RTI >
The method according to claim 1,
Wherein the RRC parameter included in the indication information or the downlink signal includes information indicating a number of subframes required for multiple TTI, multiple subframe scheduling, or cross subframe scheduling.
The method according to claim 1,
The UE determines whether the indication information is included in the RLC parameter of the downlink signal included in the downlink signal or before the reception of the downlink signal based on the number of subframes, Or the number of subframes required for cross subframe scheduling.
The method according to claim 1,
And when the frequency hopping in the uplink signal is inactivated, a frequency hopping flag of the downlink signal includes the indication information.
The method according to claim 1,
Wherein the downlink control channel includes the indication information at a remaining code point of the DCI format.
The method according to claim 1,
Wherein the downlink control channel includes one of a value of 5, 6, and 7 of the CIF field as the indication information.
A method for a base station to transmit a downlink control channel,
Generating a downlink control channel including indication information for signaling a type of scheduling; And
And transmitting the generated downlink control channel to the terminal by including the generated downlink control channel in the downlink signal,
Wherein the indication information indicates either multi-TTI, multiple sub-frame scheduling, or cross-sub-frame scheduling.
11. The method of claim 10,
Wherein the step of generating includes the step of including the instruction information having a size of 1 bit or more in the DCI format.
12. The method of claim 11,
Wherein DCI format 0 or DCI format 1a in the DCI format is included in the dedicated search space of the terminal.
12. The method of claim 11,
Includes an RRC (Radio Resource Control) parameter including information necessary for setting any one of multi-TTI, multi-sub-frame scheduling, or cross sub-frame scheduling in the downlink signal, ≪ / RTI >
11. The method of claim 10,
Wherein the RRC parameter included in the indication information or the downlink signal includes information indicating a number of subframes required for multiple TTI, multiple subframe scheduling, or cross subframe scheduling.
11. The method of claim 10,
The indication information is transmitted in a multi-TTI, multi-sub-frame scheduling, or cross-sub-frame based on a range of the number of subframes included in the RRC parameter of the downlink signal included in the downlink signal or before transmission of the downlink signal. Frames indicating the number of subframes necessary for frame scheduling.
11. The method of claim 10,
Wherein the step of generating includes the step of including the indication information in a frequency hopping flag when frequency hopping in the uplink signal is inactivated.
11. The method of claim 10,
Wherein the step of generating includes the step of including the instruction information in a remaining code point of the DCI format.
11. The method of claim 10,
Wherein the generating step generates the value of any one of 5, 6, and 7 of the CIF field to be the indication information.
A transmitter for transmitting a signal to a base station;
A receiving unit for receiving a downlink signal including a downlink control channel including indication information for signaling the type of scheduling from the base station; And
And a controller for performing one of multiple TTI, multiple subframe scheduling, and cross subframe scheduling according to the indication information.
20. The method of claim 19,
Wherein the DCI format of the control channel includes the indication information having a size of 1 bit or more.
21. The method of claim 20,
Wherein the controller searches the DCI format 0 or the DCI format 1a in the dedicated search space of the terminal.
21. The method of claim 20,
The DCI includes indication information having a size of 1 bit or more, and the downlink signal includes a Radio Resource Control (RRC) parameter including information necessary for setting either of multiple TTI, multiple subframe scheduling, or cross subframe scheduling .
20. The method of claim 19,
Wherein the RRC parameter included in the indication information or the downlink signal includes information indicating a number of subframes required for multiple TTI, multiple subframe scheduling, or cross subframe scheduling.
20. The method of claim 19,
The control unit determines whether the indication information is included in the RRC parameter of the downlink signal included in the downlink signal or before the reception of the downlink signal, based on the number of subframes included in the downlink signal, Or the number of subframes necessary for cross subframe scheduling.
20. The method of claim 19,
And a frequency hopping flag of the downlink signal includes the indication information when frequency hopping in the uplink signal is inactivated.
20. The method of claim 19,
Wherein the downlink control channel includes the indication information at a remaining code point of the DCI format.
20. The method of claim 19,
Wherein the downlink control channel includes one of a value of 5, 6, and 7 of the CIF field as the indication information.
A receiving unit for receiving a signal from the terminal;
A control unit for generating a downlink control channel including indication information for signaling a kind of scheduling; And
And a transmission unit for transmitting the generated downlink control channel to the terminal by including the generated downlink control channel in a downlink signal,
Wherein the indication information indicates one of multiple TTI, multiple subframe scheduling, or cross subframe scheduling.
29. The method of claim 28,
Wherein the controller is configured to include the indication information having a size of 1 bit or more in the DCI format.
30. The method of claim 29,
Wherein the DCI format 0 or the DCI format 1a in the DCI format is included in the dedicated search space of the terminal.
30. The method of claim 29,
The controller may include a Radio Resource Control (RRC) parameter including information required to set one bit or more of indication information in the DCI and to set either the multi-TTI, multiple subframe scheduling or cross subframe scheduling in the downlink signal, The base station comprising:
29. The method of claim 28,
Wherein the RRC parameter included in the indication information or the downlink signal includes information indicating a number of subframes required for multiple TTI, multiple subframe scheduling, or cross subframe scheduling.
29. The method of claim 28,
The indication information is transmitted in a multi-TTI, multi-sub-frame scheduling, or cross-sub-frame based on a range of the number of subframes included in the RRC parameter of the downlink signal included in the downlink signal or before transmission of the downlink signal. And indicates the number of subframes necessary for frame scheduling.
29. The method of claim 28,
Wherein the control unit includes the indication information in a frequency hopping flag when the frequency hopping in the uplink signal is inactivated.
29. The method of claim 28,
Wherein the control unit includes the instruction information in a remaining code point of the DCI format.
29. The method of claim 28,
Wherein the controller generates the value of the CIF field such that any one of values 5, 6, and 7 of the CIF field is the indication information.

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