KR20160037760A - Method and apparatus for managing allocation and usage of radio resource - Google Patents

Abstract

The present invention provides a communication method of a base station in an environment where a first carrier with a licensed band frequency and a second carrier with a non-licensed band frequency are aggregated. The base station: gives a command of activation regarding the second carrier to a terminal through at least one of the first carrier and a third carrier with a non-licensed band frequency; receives a report of channel state information on the second carrier from the terminal through the first carrier; and transmits data to the terminal through the second carrier. According to the present invention, a radio resource can be effectively allocated and used.

Description

[0001] METHOD AND APPARATUS FOR MANAGING ALLOCATION AND USAGE OF RADIO RESOURCES [

The present invention relates to a method and apparatus for managing the allocation and use of radio resources.

As the number of mobile internet users through mobile communication systems increases, mobile communication providers are seeking an efficient way to increase the capacity of a mobile communication system. The most efficient and intuitive way is to increase the bandwidth by securing additional license band frequencies for mobile communication systems. However, while the licensed band frequency has the advantage of being able to provide efficient mobile communication services through the exclusive use of the frequency, the licensing and usage cost of the frequency is high, and the licensed band frequency allocated for the mobile communication system is limited . Accordingly, mobile communication service providers and manufacturers are considering a method of providing mobile communication services using a license-exempt band frequency having a relatively high available frequency band and a low cost.

Communication systems installed at the license-exempt band frequencies have the following limitations. Communication systems installed at the license-exempt band frequencies have a limit that limits the transmission power, in order to minimize the impact on other systems sharing the license-exempt band frequencies. Specifically, when licensed and unlicensed systems are installed in the same location, unlicensed systems can result in uncoverage coverage, unlike licensed-band systems.

Communication systems installed at the license-exempt band frequencies have the limitation of using the license-exempt band frequencies discontinuously or opportunistically, for fair coexistence with adjacent license-exempt band systems. Accordingly, the transmission reliability of the control channel and common channel used in the mobile communication system can be lowered.

Due to the limitations of such license-exempt systems, scenarios in which license-based and license-exempt systems are installed and operated in a complementary manner are being considered, rather than standalone systems using only license-exempt bands. In such a scenario, reliable control functions such as terminal control and mobility management are performed by a system operating at the licensed band frequency, and traffic functions such as wireless transmission rate increase and wireless traffic load balancing are supplemented by the license- .

A system or carrier operating at the licensed band frequency performs control and traffic functions, while a system or carrier operating at the unlicensed band frequency performs a traffic function. This operation is implemented through a Carrier Aggregation (CA) operation. For example, in a carrier aggregation configuration of 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution), a carrier aggregation method between a license-exempt band FDD (Frequency Division Duplex) carrier and a license band LTE and an exemption band TDD There may be a carrier aggregation scheme between a Time Division Duplex (LTE) carrier and a licensed band LTE.

The license-exempt band cellular system has an advantage in that it can provide a mobile communication service with guaranteed quality of service by utilizing low-cost, rich frequency resources and advanced interference control technology. However, license-exempt band cellular systems require new coexistence techniques and interference control techniques in order to achieve these advantages in coexistence with various regulations and license-exempt band systems required in the license-exempt band.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for efficiently allocating and using radio resources.

In addition, a problem to be solved by the present invention is to provide a method and apparatus for efficiently managing allocation and use of radio resources.

It is another object of the present invention to provide a method and apparatus for efficiently managing and controlling wireless transmission by managing allocation and use of radio resources.

According to an embodiment of the present invention, a method is provided in which a base station communicates in an environment where a first carrier of a licensed band frequency and a second carrier of a license-exempted band frequency are carrier aggregated. The base station communication method comprising the steps of: instructing the terminal through the at least one of the first carrier and the third carrier of the license-exempt band frequency to activate the second carrier; Receiving, from the terminal, channel state information for the second carrier through the first carrier; And transmitting data to the terminal via the second carrier.

According to an embodiment of the present invention, for a radio resource allocation in a mobile radio access system, a relatively less reliable license-exempt band frequency can be operated simultaneously with a license band frequency.

Further, according to the embodiment of the present invention, the uplink data can be transmitted through the reliable license band frequency. Thus, a reliable service can be provided.

FIG. 1 is a diagram illustrating a problem of resource allocation caused by a clear channel assessment (CCA) for channel occupancy when a frequency of a license-exempt band is operated.
2A, 2B, and 2C are diagrams illustrating a License Assisted Access (LAA) deployment scenario, according to an embodiment of the invention.
FIGS. 3A, 3B, 3C, and 3D are diagrams illustrating a method for allocating resources and a method for transmitting data, when license band carriers and license-exempt band carriers are aggregated, according to an embodiment of the present invention.
Figures 4A and 4B are diagrams illustrating a method for activating and deactivating a carrier when a licensed band carrier and a license-exempt band carrier are aggregated, in accordance with an embodiment of the present invention.
FIGS. 5A, 5B, 5C, 5D, and 5E are views showing a frame structure according to carrier aggregation between a license band carrier and a license-exempt band carrier, according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a method of allocating resources using an Enhanced Physical Downlink Control Channel (EPDCCH) when a frame based equipment (FBE) method is used according to an embodiment of the present invention.
7 is a diagram illustrating a method of allocating resources using an EPDCCH when an LBE (Load Based Equipment) method is used according to another embodiment of the present invention.
8 is a diagram illustrating a method of allocating resources using EPDCCH according to another embodiment of the present invention.
9 is a diagram illustrating a method of allocating resources using an EPDCCH according to another embodiment of the present invention.
10 is a diagram illustrating a method of allocating resources for multi-subframes according to an embodiment of the present invention.
11 is a diagram illustrating a method of allocating resources for multiple sub-frames according to another embodiment of the present invention.
12 is a diagram illustrating a method of allocating resources for a multi-subframe according to another embodiment of the present invention.
13A, 13B, and 13C are diagrams illustrating a partial subframe transmission method.
14 is a diagram illustrating a PDSCH configuration method in a license-exempt band.
15 is a diagram showing the structure of partial subframes constituted in the COT of the UCC after CCA.
16 is a diagram showing a partial subframe structure further including EPDCCH.
17A, 17B and 17C are diagrams showing resource grids corresponding to sub-frames belonging to the COT of the UCC.
FIGS. 18A and 18B are diagrams showing partial subframes including a reference signal area when data is transmitted in a part of a subframe after the CCA. FIG.
19 is a view showing a partial sub-frame including an RS region when data is transmitted in a part of the last sub-frame within a range where the maximum COT is not exceeded.
20 is a diagram showing the first sub-frame, the intermediate sub-frame, and the last sub-frame of the occupation channel.
FIG. 21 is a diagram illustrating a case where the PDCCH + PDSCH region of the first subframe after the CCA has a time slot length and the PDCCH + PDSCH region of the last subframe has a normal subframe length (one TTI length).
22 is a diagram illustrating a case where the PDCCH + PDSCH region of the first subframe after the CCA has the normal subframe length (one TTI length) and the PDCCH + PDSCH region of the last subframe has the time slot length.
23 is a diagram illustrating a case where a PDCCH + PDSCH region of a first subframe among subframes of an occupied channel has a time slot length and a PDCCH + PDSCH region of the remaining subframe has a normal subframe length (1 TTI length) .
FIG. 24 shows that the PDCCH + PDSCH region of the first subframe of the occupied channel has a time slot length or a normal subframe length (one TTI length), and the PDCCH + PDSCH region of the remaining subframe has a normal subframe length 1 TTI length).
FIGS. 25 and 26 are diagrams showing a case where a PDCCH + PDSCH region of a subframe belonging to an occupied channel has a downlink pilot time slot (DwPTS) length or a normal subframe length (one TTI length).
27 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention.
28 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
29 is a diagram of a computer system, in accordance with an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station ), A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) MS, AMS, HR-MS, SS, PSS, AT, UE, and the like.

In addition, the base station (BS) includes an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B an eNodeB, an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) a BS, an ABS, a HR-BS, a Node B, a BS, a relay station (RS), a high reliability relay station (HR-RS) eNodeB, AP, RAS, BTS, MMR-BS, RS, HR-RS, repeater, small base station, macro base station and the like.

Hereinafter, for convenience of explanation, a carrier operated in a licensed band in an environment in which a carrier (or a channel) is aggregated is referred to as an LCC (Licensed Component Carrier), and a carrier operated in a license-exempted band is referred to as a UCC (Unlicensed Component Carrier). Hereinafter, for convenience of explanation, a carrier operated by a primary cell (PCell) in the LCC is referred to as a primary LCC (P-LCC), and a carrier operated by a secondary cell (SCell: secondary cell) Is referred to as S-LCC (Secondary LCC). On the other hand, when UCC can be operated by PCell, UCC and LCC differ only in frequency band. In this case, the operation method of the UCC may be the same as or similar to the operation method of the LCC. Hereinafter, it is assumed that the UCC is operated only by the SCell or by the limited PCell. On the other hand, a plurality of UCCs may be set in one SCell or operated by one SCell, but in the following, it is assumed that one UCC is used for convenience of explanation. Of course, the method for cases where one UCC is used can be applied equally or similarly even when a plurality of UCCs are used.

FIG. 1 is a diagram illustrating a problem of resource allocation caused by a clear channel assessment (CCA) for channel occupancy when a frequency of a license-exempt band is operated. In FIG. 1, it is assumed that the frequency of the license-exempted band is operated by carrier aggregation as an auxiliary carrier or SCell for the frequency of the license band. Specifically, FIG. 1 (a) illustrates a case where a BS schedules PDSCH (Physical Downlink Shared Channel) of a UCC using a Physical Downlink Control Channel (PDCCH) of an LCC. FIG. 1B illustrates a case where the BS schedules the PDSCH of the UCC using the PDCCH of the UCC (self-carrier scheduling).

The base station performs the CCA to access the license-exempt band channel, which is an auxiliary carrier, in accordance with the regulation of the license-exempt band frequency. As illustrated in FIGS. 1A and 1B, although the BS occupies a channel through the CCA, due to the characteristics of the LTE system in which resources are allocated and transmitted on a subframe basis, the CCA and PDCCH transmission points Overlapped, resources may not be allocated normally.

In particular, due to the nature of the license-exempt band, devices operating in the license-exempt band can occupy the channel. In this case, coexistence constraints between devices operating in the license-exempt band and operational constraints in the license-exempt band exist. Therefore, there is a need for a carrier aggregation technique considering the characteristics of the licensed band and the license-exempted band, and an operating method therefor.

1. License / Licensee  Default behavior for data transmission over the band

Since the data transmission operation using the license / license-exempt band can basically be performed through the LCC and the UCC, data transmission or reception through the LCC and UCC should be possible between the base station and the terminal. Particularly, in the case of a terminal, data can be received not only through data transmission / reception through the LCC, but also through the UCC. The BS and the UE exchange the capabilities of the UE when the UE initially accesses the BS, performs a cell change (handover), or attempts to exchange data via the unlicensed band.

A terminal can have at least one of the following five capabilities and perform data exchange.

- Data can be transmitted / received only through the licensed band

- Data can be transmitted simultaneously through license / license-exempt band

- Data can not be transmitted simultaneously through the license / license-exempt band (eg, data is transmitted over the license band at a certain time in time, and via the license-exempt band at other times)

- Data can be received simultaneously via license / license-exempted band

- Data can not be received at the same time through the license / license-exempt band (eg, receive data via the license band at a specific time in time, and data via the license-exempt band at another instant)

As another method of exchanging the capabilities of a terminal, when a terminal changes a cell, a device storing the capability of the terminal (e.g., a base station providing the service of the previous cell or a device managing the base station) There is a method of transmitting the capability of a terminal to a base station providing a service. According to this method, the exchange of the capability between the base station and the terminal can be omitted.

In addition, a base station exchanges a channel capable of transmitting / receiving data among a plurality of channels (frequencies) in an unlicensed band, and transmits data to the terminal through a channel that is impossible to transmit / receive during data service or is difficult to transmit / receive (E.g., handover, cell search, channel quality measurement / reporting, and the like) for the data service. Specifically, if the BS informs the MS about a serviceable channel among the channels in the unlicensed band, the MS can measure the quality of the serviceable channel and report it to the BS. Accordingly, the base station can select a channel suitable for the data service and can service the terminal. In this case, the base station and the terminal can continuously transmit data through data aggregation to add a new carrier or carrier change to change (or add, delete a previous channel) to a selected channel. If the channel that can be serviced to the terminal is a carrier supervised by a base station other than the current base station, the terminal may change to a cell managed by the carrier and be continuously provided with a data service.

2. License / Licensee  Placement for data transmission over the band ( deployment ) scenario

2A, 2B, and 2C are diagrams illustrating a License Assisted Access (LAA) deployment scenario, according to an embodiment of the invention. Figures 2b and 2c illustrate the case where a PCell and a low power SCell (e.g., a small cell) are connected via an ideal backhaul. However, even if the PCell and low power SCell are connected via a non-ideal backhaul, PCell and low power SCell can be used in conjunction with the LAA deployment scenarios 2a and 2b illustrated in Figures 2b and 2c, 2b, 3a, 3b.

2A illustrates LAA deployment scenarios 1a and 1b. In LAA deployment scenario 1a, a low power PCell or low power SCell is installed outdoors. In LAA deployment scenario 1b, a low power PCell or low power SCell is installed in the room. In LAA deployment scenarios 1a and 1b, the low power PCell or SCell may use the license band frequencies F1, F2 or the license-exempt band frequency F3.

2B illustrates LAA deployment scenarios 2a and 2b. The low power SCell is installed outdoors in the LAA deployment scenario 2a, and the low power SCell is installed in the room in the LAA deployment scenario 2b. In LAA deployment scenarios 2a and 2b SCell may use the same frequency as the license band frequency F1 used by PCell, use another license band frequency F2, or use the license-exempt band frequency F3.

Figure 2C illustrates LAA deployment scenarios 3a and 3b. The low power SCell is installed outdoors in the LAA deployment scenario 3a, and the low power SCell is installed in the room in the LAA deployment scenario 3b. In LAA deployment scenarios 3a and 3b SCell may use a license band frequency F1 that is used by PCell and a different license-exclusion band frequency F3.

3. License / Licensee  For data transmission over the band LCC and  UCC operation

Table 1 below shows how the LCC and UCC operate according to the LAA deployment scenario.

LCC, UCC operation according to the LAA deployment scenario of Figures 2a, 2b, and 2c LAA Deployment scenario Indoor / Outdoor Relevant LTECA scenarios Carrier configures Co-located Note Scenario1a Outdoor (small cell scenario 2a) LTECA scenarios 2,3 in low power cell Low power cell (L + U) LCC and UCC are co-located - LTECA is configured in low power cell
- PCell and SCell are configured in a single low power cell (co-located PCell and SCell)
- UCC is configured to SCell
- P-LCC is configured to PCell
- if S-LCC is configured (P-LCC + S-LCC + UCC), S-LCC is configured in to SCell Scenario1b Indoor (small cell scenario 2b) Scenario2a Outdoor (small cell scenario 2a) - LTECA scenarios 4,5 between PCell and SCell with IB
- LTECA scenarios 2,3 in low power SCell PCell (L) + low power SCell (L + U) with IB S-LCC and UCC are co-located - LTECA is configured in PCcell and low power SCell with ideal backhaul (non-co-located PCell and SCell)
- S-LCC and UCC are configured in a single low power SCELL Scenario2b Indoor (small cell scenario 2b) Scenario3a Outdoor (small cell scenario 2a) - LTECA scenarios 4,5 between PCell and SCell with IB PCell (L) + low power SCell (U) with IB (P-) LCC and UCC are non-co-located - CA is configured in PCell and low power SCell with ideal backhaul (non-co-located PCell and SCell)
- LCC is only configured in a PC
- UCC is only configured in a single low power SCell Scenario3b Indoor (small cell scenario 2b)

In the LAA deployment scenarios 1a, 2a, and 3a, the UCC is used by a device installed and operated outdoors (e.g., a base station). In the LAA deployment scenarios 1b, 2b, and 3b, the UCC is used by a device installed in a room (e.g., a base station).

LAA deployment scenarios 1a and 1b are scenarios where PCell and SCell are installed and operated in an overlapping manner. The LAA deployment scenarios 2a, 2b, 3a, and 3b are scenarios in which PCell and SCell are installed without overlapping, and PCell and SCell are connected through an ideal backhaul.

LAA deployment scenarios 1a and 1b are installed in the same place where PCell and SCell are installed in the same place, and LCC and UCC are set in the same device since operation (installation location is different from outdoor or indoor) is set. If two or more LCCs are present and set, at least one of the two or more LCCs is set to PCell, and at least one of the remaining LCCs may be set to SCell or not to SCell.

The LAA deployment scenarios 2a and 2b illustrate the case where LCC and UCC are configured and operated on the SCell. If the PCell and SCell are connected through non-ideal backhaul, the LCC can be set as pSCell (primary SCell or special SCell).

The LAA deployment scenarios 3a and 3b show cases where only the UCC is set and operated in the SCell.

Figures 3a, 3b, 3c, and 3d illustrate how to allocate resources and how to transfer data when a licensed band carrier (LCC) and a license-exempt band carrier (UCC) are aggregated, according to an embodiment of the invention Fig. Specifically, FIGS. 3A, 3B, 3C, and 3D illustrate a downlink / uplink resource allocation and transmission method according to the LCC and the UCC. Embodiments of the present invention use terminology or methods used / used in LTE CA unless otherwise noted. These terms and methods may be replaced by terms or methods used / used for the same or similar purposes as the use of LTE CA in other mobile radio access systems or mobile communication systems.

As described above, due to the restriction of the license-exemption band, the license-exempt band can be usefully used for the service for the downstream data. However, the UE transmits reliable uplink data (e.g., Hybrid Automatic Retransmission Request (ACK) / Negative Acknowledge (ACK) / CQI (Channel Quality Indicator)) to downlink data transmitted from the base station to the mobile station The UE can transmit reliable uplink data to the BS through a more reliable P-LCC (LCC on PCell) than the UCC. Alternatively, when the BS and the UE desire to change the service operation channel during the operation of the license-exempt band, if the terminal searches for a channel of a license-exempt band other than the currently operated channel and determines the state of the channel (e.g., The UE can transmit (report) the state of the channel to the BS through the more reliable P-LCC than the UCC, if the BS reports the interference to the BS. For this purpose, the BS can indicate (or allocate, or schedule) the uplink / downlink data resource allocation information using the resource allocation method and the resource transmission method as shown in Table 2 below.

Scenario for downlink / uplink resource allocation and transmission according to LCC and UCC LAA scheduling alternative DL (Downlink) service UL (Uplink) service LCC (DL) UCC (DL) UL relevant LCC DL UL relevant UCC DL Scenario 1 DL-self scheduling (scheduled by LCC) DL-self scheduling (scheduled by UCC) indicated by LCC indicated by UCC Scenario 2 DL-self scheduling (scheduled by LCC) DL cross-carrier scheduling (scheduled by LCC) indicated by LCC indicated by LCC Scenario 3 DL cross-carrier scheduling (scheduled by UCC) DL cross-carrier scheduling (scheduled by LCC) indicated by UCC indicated by LCC Scenario 4 DL cross-carrier scheduling (scheduled by UCC) DL-self scheduling (scheduled by UCC indicated by UCC indicated by UCC

FIG. 3A illustrates LAA scheduling alternative 1 (LAA scheduling alternative 1). Self-carrier scheduling is performed for each of the downlink P-LCC and the downlink UCC, and uplink feedback (e.g., HARQ ACK / NACK, CQI) is transmitted through the PUCCH (Physical Uplink Control Channel) of the uplink P-LCC . Specifically, downlink data resource allocation information allocated to the LCC and uplink data resource allocation information for downlink data service are allocated to resource allocation information channels (e.g., PDCCH, EPDCCH, etc.) of the same LCC, A channel for indicating information (hereinafter, the PDCCH will be described as an example). The downlink data resource allocation information allocated to the UCC and the uplink data resource allocation information for the downlink data service are indicated through the PDCCH of the same UCC. Also, unless otherwise specified, the resource indicated by the resource allocation information may be at least one of an uplink resource and a downlink resource, an uplink resource is transmitted through a PUSCH (or PUCCH), a downlink resource is transmitted through a PDSCH An embodiment of the present invention will be described. In the following description, the PUSCH (or PUCCH) or the uplink resource may be applied to the PDSCH or the portion described as the downlink resource.

FIG. 3B illustrates LAA scheduling alternative 2 (LAA scheduling alternative 2). Self-carrier scheduling is performed for downlink P-LCCs and cross-carrier scheduling is performed for P-LCCs for downlink UCCs. Uplink feedback (e.g., HARQ ACK / NACK, CQI) is transmitted on the PUCCH of the uplink P-LCC. Specifically, downlink data resource allocation information allocated to the LCC and uplink data resource allocation information for downlink data service are indicated through the PDCCH, which is a resource allocation information channel of the LCC. The downlink data resource allocation information allocated to the UCC and the uplink data resource allocation information for the downlink data service are indicated through the PDCCH of the LCC.

FIG. 3C illustrates LAA scheduling alternative 3 (LAA scheduling alternative 3). Cross-carrier scheduling by the UCC is performed for the downlink P-LCC, and cross-carrier scheduling by the P-LCC is performed for the downlink UCC. Uplink feedback (e.g., HARQ ACK / NACK, CQI) is transmitted on the PUCCH of the uplink P-LCC. Specifically, downlink data resource allocation information allocated to the LCC and uplink data resource allocation information for downlink data service are indicated through the PDCCH, which is a resource allocation information channel of the UCC. The downlink data resource allocation information allocated to the UCC and the uplink data resource allocation information for the downlink data service are indicated through the PDCCH of the LCC.

FIG. 3D illustrates LAA scheduling alternative 4 (LAA scheduling alternative 4). Cross-carrier scheduling by the UCC is performed for the downlink P-LCC, and self-scheduling is performed for the downlink UCC. Uplink feedback (e.g., HARQ ACK / NACK, CQI) is transmitted on the PUCCH of the uplink P-LCC. Specifically, downlink data resource allocation information allocated to the LCC and uplink data resource allocation information for downlink data service are indicated through the PDCCH, which is a resource allocation information channel of the UCC. The downlink data resource allocation information allocated to the UCC and the uplink data resource allocation information for the downlink data service are indicated through the PDCCH of the UCC.

Figs. 4A and 4B illustrate a method of activating or deactivating the license-exempt band carrier in the license band service for the scenario operation shown in Figs. 3A to 3D and Table 2. Fig. Specifically, FIG. 4A shows a method of activating a license-exempt band carrier in an environment where a licensed band carrier (LCC) and a license-exempt band carrier (UCC) are aggregated, and FIG. 4B shows a method of inactivating a license-exempt band carrier. In FIGS. 4A and 4B, the case where the activation and deactivation of the license-exempt zone is controlled through the license band is illustrated, but this is merely an example. Of course, activation and deactivation of the license-exempt band may be controlled through other license-exempt bands (e.g., when downlink data is transmitted via another license-exempt band).

In accordance with the above described scenario, control for activation / deactivation is performed through the license band. Specifically, as illustrated in FIG. 4A, the base station transmits an activation command for the UCC to the terminal through the LCC at time n. When the terminal receives an activation command from the base station, it measures the channel status of the UCC indicated by the activation command (or Activation CE (control element)). When the UE measures the channel condition of the UCC, it reports the measurement result (e.g., CSI (Channel State Information) report) to the BS through the LCC. Here, the CSI includes a CQI, a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and a Procedure Transaction Identity (PTI). Also, the HARQ ACK / NACK for data reception can be transmitted through the LCC. On the other hand, UCC corresponding to the activation command, from the activation time point (n) a command is transmitted k ₁ (stage, 8 (ms) ≤k ₁ or a predetermined time or more) over time, a point in time (n + ₁ k) and k ₂ is activated between _{(where, k 2 ≤34 (ms),} k 2 ≤24 (ms), or a predetermined time period or less), the time when the elapsed time (n + k _2). After the UCC is activated, the base station transmits downlink data to the UE through the activated UCC.

As illustrated in Figure 4B, the UCC may be deactivated by control through the LCC. Specifically, the base station transmits an inactivation command (or Deactivation CE) for the UCC to the terminal through the LCC at time n. The UE does not need to receive the downlink channel (e.g., PDCCH, PDSCH, EPDCCH, etc.) for the UCC indicated by the inactivation command and does not need to measure the channel status of the UCC indicated by the inactivation command. On the other hand, UCC corresponding to disable command is disabled from the time point (n) a command is transmitted k ₁ time when the period elapses (however, k ≤8 ₁ (ms) or less than a predetermined time) (n + k ₁₎ or sCellDeactivationTimer It is deactivated when the timer expires. Here, the sCellDeactivationTimer timer starts at the time (n) at which the activation command is transmitted in Fig. 4A.

On the other hand, when the carrier is changed similarly to the carrier activation / deactivation method, the carrier can be managed in the following manner. Specifically, the base station may deactivate the previous carrier (Deactivation CE) and then activate the new carrier (Activation CE). Alternatively, the base station may activate the new carrier (Activation CE) and then deactivate the previous carrier. Alternatively, the base station may perform activation of a new carrier (Activation CE) and deactivation of a previous carrier (Deactivation CE) at one time. For example, if the base station performs activation and deactivation at one time, if the value mapped to the previously activated carrier is reset from 1 to 0, the activated carrier is deactivated and the value previously set for activation / deactivation If set from 0 to 1, if the carrier is activated and the value set for activation / deactivation remains unchanged at 1, then the activated carrier can still be used. Also, if the value set for activation / deactivation is kept unchanged at zero, the base station does not activate the deactivated carrier.

4. Licensee  Coexistence and Interference Resolution in the Band

In order to solve the interference that occurs when devices of the same type / heterogeneous system operated in the license-exempt band coexist, the following method can be used.

4.1. How to choose an efficient channel

In order to prevent a plurality of devices from using the same channel in the license-exempt band, each device selects a channel from an idle channel (a channel judged not to be used by another device) or an interference The device can select a channel with the least interference among the channels as an operating channel.

4.2. How to use efficient resources on the same channel

The device may access the resource through the CCA, which is provided in the Regulatory requirement of the license-exempt zone.

Alternatively, the device may prevent other devices from using the resource during the service. Specifically, while the device is occupying the channel for service, it can provide continuous service so that the other device can not occupy the channel. Alternatively, if the device does not service data while occupying the channel, it may transmit a reference signal or data for energy detection of another device in order to prevent other devices from occupying the channel .

Alternatively, the device may be serviced only in a particular section and may be served by another device in the remaining section. For example, a device can only be served in the DL section of a TDD frame. Alternatively, the device may service the DTX on section by dividing the channel into DTX (discontinuous transmission) on / off sections. Alternatively, the device may reuse the value set for the MBSFN (Multicast Broadcast Single Frequency Network) so that it can only serve in an interval not set as MBSFN. Alternatively, the device may service another device in the interval set to MBSFN, or may only service itself in the interval set to MBSFN. Alternatively, the apparatus may operate in such a manner that the interval set in MBSFN and the interval set in MBSFN are simultaneously set to one or more than two, by setting different settings for the interval set in MBSFN and the interval set in MBSFN, respectively. Alternatively, the apparatus may use an Almost Blank Subframe (ABS) (Inter-Cell Interference Coordination) (ICSI) service. The apparatus may be operated so that divided sections have the same or similar service by making the same or different setting for each divided section as described above.

5. Licensee  Resource Allocation and Resource Usage for Bandwidth Operations

5A, 5B, 5C, 5D, and 5E show a frame structure when a licensed band carrier (LCC) and a license-exempt band carrier (UCC) are aggregated, according to an embodiment of the present invention.

FIG. 5A shows a carrier-specific frame structure according to aggregation between LCC-FDD (license band carrier operated with FDD) and UCC-FDD (license-exempt band carrier operated with FDD).

FIG. 5B shows a carrier-specific frame structure according to aggregation between LCC-FDD and UCC-TDD (license-exempt band carrier operated in TDD). FIG. 5B illustrates a case where DL / UL configuration 1 is applied to UCC-TDD.

FIG. 5C shows a carrier-specific frame structure according to aggregation between LCC-TDD (license band carrier operating in TDD) and UCC-TDD. FIG. 5C illustrates DL / UL configuration 1 applied to LCC-TDD and UCC-TDD.

FIG. 5D shows a carrier-specific frame structure according to aggregation between LCC-TDD and UCC-FDD. FIG. 5D illustrates a case where DL / UL configuration 1 is applied to the LCC-TDD.

5E shows a carrier-specific frame structure according to aggregation between LCC-TDD and UCC-TDD. FIG. 5E illustrates DL / UL configuration 1 applied to LCC-TDD and DL / UL configuration 3 applied to UCC-TDD.

5D and FIG. 5E, when the subframe of the license band is the uplink subframe and the subframe of the license-exempted band is the downlink subframe SD1, , DL cross-carrier scheduling that allocates resources of the UCC through the LCC can not be used. There is a need for a method to enable DL cross-carrier scheduling. One way to enable DL cross-carrier scheduling is to use the same frame structure (e.g., LCC-FDD + UCC-FDD, or LCC-TDD + UCC-FDD with the same DL / UL configuration applied) TDD) is a method of carrier aggregation of license and license-exempt bands. Another method for enabling DL cross-carrier scheduling is to perform downlink service of a corresponding UCC in a case where the UCC performs downlink service at a time when the DL / UL configuration is different and corresponds to the uplink subframe of LCC-TDD, (Subframe muting) to prevent the frame from being serviced. Another method of enabling DL cross-carrier scheduling is to use aggregation between LCC-FDD and UCC-TDD, as illustrated in FIG. 5B. Another method of enabling DL cross-carrier scheduling is to apply the same DL / UL configuration to LCC-TDD and UCC-TDD, as illustrated in FIG. 5C. As illustrated in FIGS. 5B and 5C, the LCC that performs scheduling for a carrier serving a further UCC may be set to at least a downlink carrier. As another method, there is a method of allowing UCC to perform self-carrier scheduling to the same carrier in a section where cross carrier scheduling from LCC to UCC is not possible. Another method is to allow the UCC to perform self-carrier scheduling during all channel occupancy times when some subframes (intervals) within the channel occupation time are periods in which cross-carrier scheduling is not possible.

Table 3 below shows another embodiment of a resource allocation method for each subframe according to the carrier aggregation between the LCC and the UCC.

Scenario for downlink / uplink resource allocation method by subframe according to LCC and UCC scenarios subframe Note P-LCC UCC Scenario 1 DL DL - either cross-carrier scheduling from P-LCC or Self-scheduling on UCC Scenario 2 DL UL - self-scheduling only in P-LCC
- no cross-carrier scheduling from P-LCC (No scheduling UCC) Scenario 3 UL DL - self-scheduling only in UCC
- no cross-carrier scheduling from P-LCC (No scheduling LCC) Scenario 4 UL UL - schedules neither LCC nor UCC

As in the scenario 1 of Table 3, when the subframe of the P-LCC is a DL subframe and the subframe of the UCC is a DL subframe, application of the DL cross-carrier scheduling for allocating resources of the UCC through the P- It is possible to apply DL self-carrier scheduling to allocate UCC resources.

However, as in the scenario 3 of Table 3, when the subframe of the P-LCC is the UL subframe and the subframe of the UCC is the DL subframe to provide the downlink data service, the DL cross- Is not applicable. In this case, for resource allocation, DL self-carrier scheduling may be used to allocate resources of the UCC via the UCC instead of DL cross-carrier scheduling.

As in the scenario 2 and the scenario 4 of Table 3, since the UCC subframe is the UL subframe, the UCC does not provide the DL service regardless of whether the subframe of the P-LCC is the DL subframe or the UL subframe. However, if the LCC is the DL subframe at the time point nk at which the uplink resource is allocated to the current subframe n, the uplink resource may be allocated by the cross carrier scheduling, and the uplink resource may be allocated to the current subframe n If the UCC is a DL sub-frame at a time point nk to allocate, uplink resources can be allocated by self-carrier scheduling. As described above, when the LCC is the UL sub-frame at the nk time point, the resource allocation based on the cross-carrier scheduling is restricted to be performed, or the n-th time point (here, m is a predetermined value) Carrier scheduling based resource allocation may be performed.

6. Licensee  Band resource occupancy behavior ( CCA Resource Allocation Considering Characteristics

A method for solving the problem as illustrated in Fig. 1 will be described in detail with reference to Figs. 6 to 12. Fig. In Figs. 6 to 11, T _Frame represents T _Occupancy represents the channel occupation time, T _Idle represents the channel idle time, and T _CCA represents the CCA time.

FIG. 6 and FIG. 7 illustrate a method of indicating data allocation information through a PDCCH and an Enhanced Physical Downlink Control Channel (EPDCCH) when resource of a license-exempt band is allocated. Specifically, FIG. 6 is a diagram illustrating a method of allocating resources using an Enhanced Physical Downlink Control Channel (EPDCCH) when a frame based equipment (FBE) method is used. FIG. 6A shows a case where cross carrier scheduling is performed, and FIG. 6B shows a case where self-carrier scheduling is performed. 7 is a diagram illustrating a method of allocating resources using an EPDCCH when an LBE (Load Based Equipment) method is used. The CCA illustrated in FIG. 7 is a CCA performed in the LBE method, and an extended CCA (Extended CCA) can be performed in addition to the initial CCA. FIG. 7A shows a case in which cross-carrier scheduling is performed, and FIG. 7B shows a case in which self-carrier scheduling is performed.

8 is a diagram illustrating another method of allocating resources using EPDCCH. Specifically, in the embodiment of FIG. 8, the base station performs cross-carrier scheduling at the CCA time and performs self-carrier scheduling for the subsequent channel occupancy time. Meanwhile, the CCA illustrated in FIG. 8 is a CCA performed in the FBE method or the LBE method, and an extended CCA may be performed when the LBE method is used in particular.

9 is a diagram showing another method of allocating resources using EPDCCH. Specifically, in the embodiment of FIG. 9, the base station performs cross carrier scheduling at the CCA time, and performs self-carrier scheduling for the subsequent channel occupancy time. Meanwhile, the CCA time illustrated in FIG. 9 is a PDCCH transmission time point. The CCA illustrated in FIG. 9 is a CCA performed in the FBE method or the LBE method, and an extended CCA may be performed particularly when the LBE method is used.

As illustrated in FIGS. 6A and 7A, when a resource is allocated through a cross-carrier scheduling method, the base station transmits the PDCCH through a licensed band carrier (LCC) (UCC) < / RTI > Alternatively, the EPDCCH may be predefined (or preset) instead of directly instructing the EPDCCH through the PDDCH, so that the terminal can transmit the resource previously set (set) by the base station without instruction from the base station (indication via PDCCH) , And perform an operation for receiving a predefined resource (hereinafter referred to as a 'reception method over an already defined EPDCCH'). On the other hand, the EPDCCH indicates a data transmission (PDSCH). In this case, even if the end point of the CCA overlaps with the PDCCH transmission point at the time of the CCA, if the CCA ends before the EPDCCH transmission point, the base station can transmit the PDCCH through the LCC and the terminal can receive the PDCCH And prepare to receive the EPDCCH and PDSCH of the UCC in which transmission is expected.

A case where the base station does not occupy (or use) a channel because the channel is being used by another device as a result of performing the CCA on the UCC will be described. Since the base station can not transmit data (e.g., PDCCH, EPDCCH, PDSCH, etc.) through the UCC, the base station transmits only the PDCCH through the LCC in the first subframe after the CCA and transmits data (e.g., EPDCCH, PDSCH, ). The base station does not include information indicating the EPDCCH or resource allocation (PDSCH, PUSCH) of the corresponding UCC until the next CCA starts. On the other hand, in the reception method using the predefined EPDCCH, if the EPDCCH is properly received, the terminal determines that the channel is occupied (or used) by the serving base station, and receives the PDSCH from the resource indicated by the EPDCCH If the EPDCCH is not properly received, it can be determined that the channel is being used by another device.

A case where a base station performs a CCA and a channel is available and occupies / uses a channel will be described. The base station transmits the PDCCH through the LCC during the channel occupancy time (T _Occupancy ) after the CCA to indicate the EPDCCH transmitted through the UCC. The EPDCCH transmitted through the UCC indicates the PDSCH including data (PDSCH) allocation information of the corresponding subframe. On the other hand, in the reception method using the predefined EPDCCH, if the EPDCCH is properly received, the terminal determines that the channel is occupied (or used) by the serving base station, and receives the PDSCH from the resource indicated by the EPDCCH If the EPDCCH is not properly received, it can be determined that the channel is being used by another device.

On the other hand, when applying this method, data is not transmitted through the UCC during a time corresponding to the PDCCH transmitted through the LCC (e.g., a minimum of one OFDM symbol and a maximum of four OFDM symbols). Therefore, To prevent the channel from being used, the base station may transmit a reservation signal. Through this, another device determines that the channel is Busy or Occupied as a result of CCA. For this, the following methods can be used.

The base station may include the PDCCH information to be transmitted through the LCC in the reservation signal and transmit the reservation signal. Through this, a PDCCH including the same information can be transmitted through the LCC and the UCC.

Alternatively, as illustrated in Figure 6 (b), the base station may terminate the CCA prior to PDCCH transmission in order to perform self-carrier scheduling for the UCC. In this way, the base station can allocate resources of the UCC. On the other hand, when a base station allocates resources of a UCC using self-carrier scheduling, it may omit the EPDCCH and directly indicate resource allocation information (e.g., PDSCH) on the PDCCH.

8, the base station allocates resources of the UCC by performing cross-carrier scheduling through the LCC when the CCA is performed, and allocates resources of the UCC to the channel occupancy time (T _Occupancy ) It is possible to allocate resources of UCC by performing self-carrier scheduling through UCC. On the other hand, when a base station allocates resources of a UCC using self-carrier scheduling, it may omit the EPDCCH and directly indicate resource allocation information (e.g., PDSCH) on the PDCCH. On the other hand, as illustrated in FIG. 9, the CCA time point may be defined as a time point at which the PDCCH is transmitted, instead of being defined as a time point before the PDCCH transmission (before the subframe). According to the embodiment of FIG. 9, resource utilization efficiency for the last subframe SFL1 of the channel occupancy time (T _Occupancy ) can be improved.

Alternatively, the base station may transmit a reservation signal when the channel is idle. The terminal receiving the reservation signal can determine that the corresponding channel is occupied (or used) by its serving base station and can perform an operation for receiving data (receiving PDCCH, EPDCCH, PDSCH, etc.).

On the other hand, when the base station needs to inform the terminal of the CCA result, the method illustrated in FIG. 8 may be used. The UE determines the UCC expected to transmit data through the PDCCH of the LCC and prepares to receive data for the UCC. In this case, the UE can recognize that the CCA for the UCC has been established, and recognize that data transmission through the UCC may be possible. If the channel is occupied (or used) as a result of the CCA, the base station transmits the EPDCCH and the PDSCH through the UCC. If the channel is occupied (or used) by another device as a result of the CCA, the base station can not transmit data such as EPDCCH and PDSCH through the corresponding UCC, so that the UE fails to receive data. A terminal that has not successfully received data can recognize the CCA result, i.e., that the channel is being used by another device (that the channel is busy or occupied). If the base station desires to allocate / transmit resources by changing the UCC, the carrier can be changed to a new UCC through the carrier identification information included in the PDCCH (including information on the previous UCC and information on the new UCC) have. The base station can operate such as selecting a carrier to be newly changed, transmitting and receiving data, searching and measuring a channel, and the like.

10 to 12 are diagrams illustrating a method of allocating resources for multi-subframe or multi-TTI (Transmission Time Interval) according to an embodiment of the present invention. Specifically, FIG. 10A shows a case where cross carrier scheduling is performed, and FIG. 10B shows a case where self-carrier scheduling is performed. FIG. 11A shows a case where cross carrier scheduling is performed, and FIG. 11B shows a case where self-carrier scheduling is performed. Figures 12 (a) and 12 (b) show a case where cross-carrier scheduling is performed.

FIG. 10 illustrates a method of performing scheduling for channel occupancy time (T _Occupancy ) in the first subframe SFF1 after the CCA when the base station determines that the channel can be occupied (or used) as a result of the CCA. The base station can omit the PDCCH transmission in the second subframe after the CCA and in the last (or predetermined) subframe. That is, the BS can perform scheduling for a plurality of subframes belonging to a channel occupancy time (T _Occupancy ) of the UCC in one subframe SFF1, and allocate and use resources.

On the other hand, as illustrated in FIG. 11, in a subframe after the first subframe SFF2 of the subframes belonging to the UCC channel occupancy time (T _Occupancy ), the base station transmits a resource region for reservation signal transmission for EPDCCH transmission It can also be used. That is, the difference between the embodiment of FIG. 10 and the embodiment of FIG. 11 is to what extent the base station uses the EPDCCH region of the UCC.

On the other hand, as illustrated in (b) of FIG. 12, the base station transmits data (PDSCH) in the remaining regions excluding the EPDCCH region among the resource regions of the subframes (subframes i to i + 3) belonging to the UCC channel occupation time . Alternatively, as illustrated in FIG. 12A, the base station may transmit only data (PDSCH) without the EPDCCH region among the resource regions of the subframes (subframes i to i + 3) belonging to the UCC channel occupation time. That is, the difference between the embodiment of FIG. 11 and the embodiment of FIG. 12 is to what extent the base station uses the PDSCH region of the UCC.

7. More than 1ms  Short sub-frame configuration and transmission

In accordance with the regulation of the license-exempt band frequency, CCA is basically carried out for channel access / occupancy / use for data transmission. CCA is difficult to perform in accordance with a subframe unit which is a basic operation unit of LTE. In addition, transmitting data in a subframe within a channel occupation time (COT) causes a waste of occupation resources by a maximum of 1 / COT.

To this end, partial subframe transmission may be supported, as illustrated in Figures 13A, 13B, and 13C. 13A, 13B, and 13C are diagrams illustrating a partial subframe transmission method. In Figure 13a, Figure 13b, and 13c, Ext-CCA represents the extended CCA, the initial signal (initial signal) represents the above-described reservation signal, T _CCA represents the CCA time, T _{ext - CCA} extends CCA time And T _RSV represents a reservation signal transmission time. The _{CCA + T RSV - T RSV _} TOTAL is by channel reservation time, T _CCA + T _ext. T _TX represents a data transmission time, and T _COT represents a channel occupation time. T _COT is T _TX + T _RSV . T _CCA1 is T _CCA + T _{ext - CCA} to be.

Specifically, FIG. 13A illustrates a fractional subframe that enables data transmission in intervals FS1 and FS2 shorter than 1 ms.

13B illustrates a super TTI sub-frame that enables data transmission in a period shorter than 1 ms and in a period SS1 and SS2 in which 1 ms sub-frame adjacent to the short period is added.

FIG. 13C illustrates a floating subframe for reconstructing subframes FLS1, FLS2, ..., FLS3 in units of 1 ms after the end of the CCA to enable data transmission. That is, each of the data transfer areas FLS1, FLS2, ..., FLS3 has a length of 1 ms.

Therefore, in order to apply the cellular technology to the license-exempt band and efficiently use the operation and the occupied resources according to the license-exemption band frequency regulation, the scheduling method and the HARQ retransmission method supported in the LTE are described in FIGS. 13A, 13B, Considering partial sub-frame transmission, it needs to be supported.

On the other hand, in the LTE, the TTI that is a subframe unit includes (E) PDCCH and PDSCH. For data transmitted from the base station to the mobile station, resource allocation is performed in units of RB (Resource Block). A modulation and coding scheme (MCS) applied to data transmission and a transport block size (TBS) according to an MCS are determined for an RB indicated by DCI (Downlink Control Information) transmitted when a resource is allocated. However, the CCA is performed to comply with the regulations for the operation of the license-exempt band frequency, and the start and end of the CCA may not be performed at the beginning and end of the subframe. Accordingly, when the above-described partial subframe is supported, the PDSCH transmission and the EPDCCH transmission may be performed in an OFDM (Orthogonal Frequency Division Multiplexing) symbol in a subframe instead of the start and end points according to the LTE standard.

Meanwhile, the 3GPP LTE comprises a TTI in units of 1 ms, and the TTI includes a PDCCH and a PDSCH for data transmission, and further includes an EPDCCH according to the setting. In particular, due to the feature that the license-exempt band carrier operates as an auxiliary carrier, the terminal may expect only the PDSCH and receive and decode only the PDSCH in the license-exempt band according to the scheduling method (e.g., cross-carrier scheduling) of the base station. On the other hand, only the TTI having one length (same length) of the partial sub-frame length (shorter than one TTI length of 3GPP, for example, 0.5 ms or 1 slot unit length) according to the embodiment of the present invention, The configuration of the partial sub-frame and the transmission method according to the embodiment of the present invention can also be applied to the system constituted with this. The frame of such a system may be composed of a sub-frame having a length corresponding to a TTI (shorter than 1 ms) of a corresponding one of the first partial sub-frame and the last partial sub-frame described below.

FIG. 14 shows a method (method M10, method M11) for constructing a PDSCH in a license-exempt band in which cross carrier scheduling is set.

As illustrated in FIG. 14 (b), the method M11 is a method in which the PDSCH region does not include a region corresponding to the PDCCH. Specifically, the method M11 is a method that can be applied based on the existing LTE standard. For example, the PDSCH is transmitted in the remaining region excluding the region corresponding to the PDCCH (e.g., OFDM symbol # 0-3) among the resource regions of the intermediate subframe belonging to the COT of the UCC. The method M11 can be used while minimizing the specification change (e.g., TBS redefinition) for the PDSCH. However, according to the method M11, a coexistence method such as a channel access restraint method and the like is necessary because another license-exempt band operating device can perform channel access to a region corresponding to the PDCCH.

As illustrated in FIG. 14A, the method M10 is a method in which the PDSCH region includes an area corresponding to the PDCCH. For example, the PDSCH region of the intermediate subframe belonging to the COT of the UCC has a 1 ms TTI length. The method M10 can be applied to a cross carrier scheduling technique and can prevent channel access of another license-exempt band operating apparatus to an area corresponding to the PDCCH. Therefore, the base station can use the PDSCH region up to the PDCCH region. However, for this purpose, it may be necessary to redefine the TBS.

On the other hand, when the partial subframe transmission is supported, due to the characteristics of the CCA, the base station may not be able to access and use the OFDM symbol through which the PDCCH is transmitted. 15 is a diagram showing the structure of partial subframes constituted in the COT of the UCC after CCA.

As illustrated in FIG. 15, the PDCCH + PDSCH region of each of the first subframe and the last subframe among the subframes belonging to the COT of the UCC may be configured as a partial subframe. In this specification, a PDCCH + PDSCH region may include a PDCCH region and a PDSCH region or may include only a PDSCH region. The PDCCH and the PDSCH can be configured in the following manner (method M20, method M21, method M22, method M23, method M24, method M25, method M26). Also, unless otherwise specified, it is assumed that self-carrier scheduling is performed in which the PDCCH of the corresponding subframe indicates the resource allocation information of the PDSCH when the PDCCH and the PDSCH are simultaneously included in the subframe.

The method M20 illustrated in FIGS. 15A and 15B is a method in which a partial sub-frame (having a length of less than 1 ms) and a normal sub-frame (having a length of 1 ms) include a PDCCH and a PDSCH to be. For example, as illustrated in (a) and (x) of FIG. 15, each of the first subframe and the last subframe belonging to the COT of the UCC is a partial subframe and includes a PDCCH and a PDSCH. The intermediate subframe belonging to the COT of the UCC is a general subframe and includes a PDCCH and a PDSCH. Method M20, And can be applied to a typical subframe structure of LTE. In order for the method M20 to be used, it is necessary to define a PDCCH region and a PDSCH region according to the structure of the partial subframe, and definitions for related operations such as TBS definition. Meanwhile, according to the method M20, the last subframe belonging to the COT of the UCC can be reused in the downlink pilot time slot (DwPTS) structure of the TDD.

In the method M21 illustrated in FIGS. 15B and 15Y, when the partial subframe and the common subframe are consecutively consecutively, the PDCCH is included in the previous subframe but the PDCCH is not included in the subsequent subframe to be. For example, as illustrated in (b) and (y) of FIG. 15, the first subframe belonging to the COT of the UCC is a partial subframe and the second subframe is a normal subframe, Includes the PDCCH and the PDSCH, and the second subframe that is the subsequent subframe includes only the PDSCH. In order for the method M21 to be used, a PDCCH of the previous subframe (for example, the first subframe) needs to be defined for the same sub-frame as that of the PDCCH region and the PDSCH region according to the structure of the partial subframe, The PDSCH of the frame (e.g., the first subframe) and the PDSCH of the next subframe (e.g., the second subframe), respectively. On the other hand, the method M21 can use a relatively large TBS definition or a higher coding rate because a consecutive sub-frame and a general sub-frame can be configured as one TTI, The PDCCH of the first subframe) can be set (operated) to indicate the resource allocation information of the PDSCH configured by one TTI.

The method M22 illustrated in FIGS. 15 (c) and (y) is a method in which the PDCCH is not included in the partial subframe. For example, as illustrated in (c) and (y) of FIG. 15, each of the first subframe and the last subframe belonging to the COT of the UCC is a partial subframe, and includes only the PDSCH. Method M22 can be applied to a typical subframe structure of LTE, so that the specification change can be minimized. However, according to method M22, the base station can not apply the self-carrier scheduling to the occupied channels of the first partial subframe and the last partial subframe belonging to the COT, and does not apply the cross carrier scheduling, Frame resources are not allocated) and can be set (operated).

The method M23 illustrated in FIGS. 15A and 15B is a method in which the last partial subframe among the subframes belonging to the COT of the UCC includes only the PDSCH and the remaining subframes include the PDCCH and the PDSCH. For example, as illustrated in (a) and (y) of FIG. 15, the first subframe belonging to the COT of the UCC is a partial subframe and includes PDCCH and PDSCH, the intermediate subframe is a normal subframe, PDSCH, and the last subframe is a partial subframe and includes only the PDSCH. In order for the method M23 to be used, it is necessary to define a PDCCH area and a PDSCH area of the UE according to the structure of the partial subframe, and a definition for a related operation such as a TBS definition. When the PDCCH of the previous subframe is a PDSCH of the same subframe, PDSCH resource allocation information of the PDSCH. On the other hand, the method M23 can form a relatively large TBS definition or a higher-order TTI since a succeeding sub-frame (for example, the last sub-frame) and a general sub-frame A coding rate can be used and the PDCCH of the previous subframe can be set (operated) to indicate the resource allocation information of the PDSCH (the last subframe of the last subframe and the previous subframe of the last subframe) constituted by one TTI.

The method M24 illustrated in (c) and (x) of FIG. 15 is a method in which the first partial subframe among the subframes belonging to the COT of the UCC includes only the PDSCH and the remaining subframes include the PDCCH and the PDSCH. For example, as illustrated in (c) and (x) of FIG. 15, the first subframe belonging to the COT of the UCC is a partial subframe and includes only the PDSCH, the intermediate subframe is a general subframe, and PDCCH and PDSCH And the last subframe is a partial subframe and includes a PDCCH and a PDSCH. In order for the method M24 to be used, it is necessary to define a PDCCH region and a PDSCH region of the UE according to the structure of the partial subframe, and definitions for related operations such as TBS definition. Self-carrier scheduling can not be applied to the first sub-frame, and cross-carrier scheduling can be applied or resources can be set (operated). On the other hand, the method M24 can construct a sub-subframe and a general subframe (e.g., the first two subframes belonging to the COT or the last two subframes) as one TTI, so that a relatively large TBS definition or a higher coding And can be set (operated) so that the corresponding resource allocation information is indicated on the PDCCH of the subframe including one TTI.

The method M25 illustrated in (d) and (z) of FIG. 15 is a method in which the subframe of the license-exempt band includes only the PDSCH. For example, as illustrated in (d) and (z) of FIG. 15, both the partial subframe and the normal subframe belonging to the COT of the UCC include only the PDSCH. The method M25 can be used when cross carrier scheduling is set. On the other hand, according to method M25, a relative PDCCH load can be taken in the license band.

In the method M26 illustrated in FIGS. 15B and 15C, when both the partial subframe and the general subframe belonging to the COT of the UCC include the PDCCH and the PDSCH, if the partial subframe and the common subframe are consecutively And the latter subframe includes only the PDSCH. For example, as illustrated in (b) and (x) of FIG. 15, since the first subframe belonging to the COT of the UCC is a partial subframe and the second subframe is a normal subframe, Includes the PDCCH and the PDSCH, and the second subframe that is the subsequent subframe includes only the PDSCH. (Operation) so that the PDCCH of the previous subframe (e.g., the first subframe) indicates the PDSCH of the PDSCH of the same subframe (e.g., the first subframe) and the PDSCH of the next subframe (e.g., . The remaining subframes include a PDCCH and a PDSCH.

16 is a diagram illustrating a partial subframe structure including an EPDCCH as well as a PDCCH and a PDSCH. As illustrated in FIG. 16, the first subframe and the last subframe among the subframes belonging to the COT of the UCC are configured as partial subframes, and the remaining subframes are configured as general subframes. The PDCCH, the PDSCH, and the EPDCCH can be configured in the following manner (method M30, method M31, method M32). Assuming that the PDCCH of the corresponding subframe indicates the resource allocation information of the PDSCH or the self-carrier scheduling in which the EPDCCH indicates the resource allocation information of the PDSCH is performed when the PDCCH and the PDSCH are simultaneously included in the subframe do.

The method M30 exemplified in (f1), (f2), (m1), (m2), (m5), (l1), (l2), and (l5) in FIG. 16 shows that the EPDCCH region has the same OFDM And has a symbol length. Specifically, the first subframe among the subframes belonging to the COT of the UCC is configured as one of (f1) and (f2) in FIG. 16, and the intermediate subframe is composed of (m1), (m2), and And the last subframe is configured as one of (11), (12), and (15). Method M30 is a method that can be applied to the LTE standard. In order for the method M30 to be used, it is necessary to define the partial subframe illustrated in (f1), (f2), (l1), (l2) A configuration (configuration starting from OFDM symbol 0) is additionally required. On the other hand, when the subframe is configured as illustrated in (m5) and (l5) in FIG. 16, there is a need for a method for preventing another license-exempt band operating apparatus from accessing a channel of a region where PDCCH is not transmitted.

The method M31 exemplified in (f2) to (f4), (m2) to (m5), and (l2) to (l5) in FIG. 16 is a method in which the EPDCCH region is OFDM symbol j j = 0, 1, 2, 3, 4). Specifically, the first subframe among the subframes belonging to the COT of the UCC is configured as one of (f2) to (f4) in FIG. 16, and the intermediate subframe is configured as one of (m2) to , And the last subframe is configured as one of (l2) to (l5). In the case where the OFDM symbol length of the EPDCCH region is set equal to the PDSCH region, the OFDM symbol length of the EPDCCH region according to the method M31 may be equal to the OFDM symbol length of the EPDCCH region according to the method M30. However, when the OFDM symbol length of the EPDCCH region is set differently from the PDSCH region, it is necessary to define (or set) the length of the corresponding EPDCCH region. This is because the base station transmits an instruction (e.g., RRC signaling, MAC CE, And the like) or a combination of two or more of them. It is also possible to apply the method M31 to the case where there is no PDSCH. On the other hand, the EPDCCH can be configured to be configured from the OFDM symbol 0 in order to prevent other license-exempt band operating apparatuses from accessing the channel of the area where the PDCCH is not transmitted.

The method M32 illustrated in (f2), (f3), (l2), and (13) in FIG. 16 is a method in which the EPDCCH region is the first ODFM symbol j (= 0,1,2,3,4) . Specifically, the first subframe among the subframes belonging to the COT of the UCC is configured as one of (f2) and (f3) in FIG. 16, and the last subframe is configured as one of (12) and (13) , And the intermediate subframe is configured as one of (m1) to (m5). If the OFDM symbol length of the EPDCCH region is different from that of the PDSCH region, the method M32 needs to define (or set) the length of the corresponding EPDCCH region. This means that the base station transmits an instruction (e.g., RRC signaling, MAC CE, L1 signaling, and the like). The method M32 can be applied even when there is no PDSCH. On the other hand, the method M32 can suppress the channel access of the other license-exempt band operating device in the partial sub-frame.

The method M33 exemplified in (f1), (f4), (m1), (m4), (m5), (l1), (l4), and (l5) in FIG. 16 shows that the EPDCCH region is a PDCCH region The first OFDM symbol is the first OFDM symbol except for the OFDM symbol which can be set to < RTI ID = 0.0 > Specifically, the first subframe among the subframes belonging to the COT of the UCC is configured as one of (f1) and (f4) in FIG. 16, and the intermediate subframe is composed of (m1), (m4), and And the last subframe is configured as one of (ll), (l4), and (l5). On the other hand, the method M33 can be applied to the LTE standard. However, in order to use the method M33, when the OFDM length of the EPDCCH region is different from the PDSCH region (e.g., (f4), (m4), and (E.g., one or more combinations of RRC signaling, MAC CE, L1 signaling, etc.) from the base station to the terminal.

7.1. For data transmission of subframes Resource Element (RE) TBS

As illustrated in FIGS. 14 to 16, according to the configuration of the first subframe and the last subframe belonging to the COT of the license-exempt band, the subframe is a partial subframe composed of a general subframe defined in 3GPP LTE or a part of OFDM symbols And may include PDSCH, PDCCH, and EPDCCH. On the other hand, in a system in which a whole frame or a part of frames is composed of only a part of subframes from the first subframe to the last subframe according to an embodiment of the present invention (e.g., one TTI is shorter than 1 ms defined by 3GPP A system in which the entire section or a partial section is constituted by only sub-frames having a length of 0.5 ms or 1 slot), a system in which a frame is composed of only the first sub-frame or the last sub-frame exemplified in Figs. 14 to 16) A RE configuration according to the embodiment (e.g., a subframe composed only of the subframes illustrated in Figs. 17A through 17C or a specific OFDM symbol illustrated in Table 4), and a subframe structure And TBS size may be applied.

FIGS. 17A, 17B and 17C are diagrams showing a DL resource grid corresponding to the partial subframe and the normal subframe illustrated in FIG. 13A.

Specifically, as illustrated in FIG. 17A, the resource block Rb1a in the resource grid for the first subframe among the subframes belonging to the COT of the UCC corresponds to the interval FS1.

As illustrated in FIG. 17B, the resource block Rb1b in the resource grid for the middle subframe among the subframes belonging to the COT of the UCC corresponds to the interval FS3.

As illustrated in FIG. 17C, the resource block Rb1c in the resource grid for the last subframe among the subframes belonging to the COT of the UCC corresponds to the interval FS2.

Since the resource grids shown in Figs. 17A, 17B, and 17C conform to the LTE standard, detailed description of the resource grids will be omitted.

7.1.1. TBS  Determination method (method M40)

The method M40 is a method of obtaining a usable RE for data transmission according to the number of OFDM symbols constituting a subframe and obtaining a TBS based on the obtained RE.

Table 4 below shows an example of a usable RE for data transmission, which is obtained based on the number of OFDM symbols constituting a subframe.

Example of RE for partial subframe in COT Idx l _DataStart l _DataEnd

the number OF OFDM symbols

the number of REs

Note First TTI of COT












0 0 13 14 152 (= 14 * 12-16) No partial subframe in the whole subframe One One 13 13 144 (= 13 * 12-12) 2 2 13 12 132 (= 12 * 12-12) 3 3 13 11 120 (= 11 * 12-12) TBS decision criterion of present standard 4 4 13 10 108 (= 10 * 12-12) 5 5 13 9 100 (= 9 * 12-8) 6 6 13 8 88 (= 8 * 12-8) 7 7 13 7 76 (= 7 * 12-8) 8 8 13 6 68 (= 6 * 12-4) 9 9 13 5 56 (= 5 * 12-4) 10 10 13 4 44 (= 4 * 12-4) 11 11 13 3 32 (= 3 * 12-4) 12 12 13 2 24 (= 2 * 12-0) 13 13 13 One 12 (= 1 * 12-0) Last TTI of COT























14 0 0 One 8 (= 1 * 12-4) 15 0 One 2 20 (= 2 * 12-4) 16 0 2 3 32 (= 3 * 12-4) 17 0 3 4 44 (= 4 * 12-4) 18 0 4 5 52 (= 5 * 12-8) 19 0 5 6 64 (= 6 * 12-8) 20 0 6 7 76 (= 7 * 12-8) 21 0 7 8 84 (= 8 * 12-12) 22 0 8 9 96 (= 9 * 12-12) 23 0 9 10 108 (= 10 * 12-12) 24 0 10 11 120 (= 11 * 12-12) 25 0 11 12 132 (= 12 * 12-16) 26 0 12 13 144 (= 13 * 12-16) 27 0 13 14 152 (= 14 * 12-16) Same as Idx0

Specifically, the TBS included in a partial subframe (e.g., partial PDSCH or partial EPDCCH) in one subframe can be calculated by the following equation (1).

은 방법 M40에 따른 TBS를 나타내고,

는 I_TBS와 N_PRB에 따른 TBS(표준 규격 TS 36.213에 정의)를 나타낸다. In Equation (1)

Lt; / RTI > represents TBS according to method M40,

Indicates the TBS (as defined in the standard TS 36.213) according to I _TBS and N _PRB .

이다. 여기서,

는 PDSCH 내에 포함되는 RS(CRS, CSI-RS 등)를 이용해 TBS을 구하기 위해서, 제외되는 RE의 개수를 나타낸다.In Equation (1)

to be. here,

Represents the number of REs excluded in order to obtain the TBS using the RSs (CRS, CSI-RS, etc.) included in the PDSCH.

이고, 하나의 서브프레임을 구성하는 OFDM 심볼들의 개수를 나타낸다. 여기서,

는 서브프레임의 종료와 시작을 나타내는 OFDM 심볼 인덱스이다.

And represents the number of OFDM symbols constituting one subframe. here,

Is an OFDM symbol index indicating the end and start of a subframe.

이다.In Equation (1)

to be.

는 하나의 RB 내의 부반송파들의 개수이고,

는 부분 서브프레임 내의 CRS(Cell-specific Reference Signal)의 개수를 나타낸다. 만약, 3GPP LTE에서 정의되는 TBS가 그대로 이용되고,

이 11(

)이라면,

= 12이고,

는 0, 4, 8, 12, 또는 16이다.

Is the number of subcarriers in one RB,

Specific reference signal (CRS) in the partial sub-frame. If TBS defined in 3GPP LTE is used as it is,

This 11 (

),

= 12,

Is 0, 4, 8, 12, or 16.

는 데이터 전송에 사용되지 않는 RE의 개수에 따라 변경될 수 있다.In the above equation,

May be changed according to the number of REs not used for data transmission.

는 데이터 전송에 사용되지 않는 RE의 개수에 따라 변경될 수 있다.In the above equation,

May be changed according to the number of REs not used for data transmission.

은 하향링크 슬롯 내의 OFDM 심볼의 개수(예, 7개)이다.

Is the number (e.g., 7) of OFDM symbols in the downlink slot.

는 PDCCH를 위한 OFDM 심볼의 개수이다.

Is the number of OFDM symbols for the PDCCH.

On the other hand, in the case of super TTI subframes (e.g., super TTI subframes SS1 and SS2 in Fig. 13B) composed of two subframes (e.g., partial subframe + general subframe) Likewise, the method M40 obtains TBS for each constituent sub-frame of the super TTI sub-frame, and then obtains the total TBS.

은 슈퍼 TTI 서브프레임의 TBS를 나타낸다.In Equation (2)

Represents the TBS of the super TTI subframe.

은 슈퍼 TTI 서브프레임의 구성 서브프레임 중 첫 번째 서브프레임의 TBS를 나타내고, 수학식1에 의해 계산될 수 있다.

Represents the TBS of the first subframe among the constituent subframes of the super TTI subframe, and can be calculated by Equation (1).

는 슈퍼 TTI 서브프레임의 구성 서브프레임 중 두번째 서브프레임의 TBS를 나타내고, 수학식1에 의해 계산될 수 있다.

Represents the TBS of the second subframe among the constituent subframes of the super TTI subframe, and can be calculated by Equation (1).

On the other hand, in the case of a floating sub-frame (e.g., floating sub-frame FLS1, FLS2, FLS3 in Fig. 13C) reconstructed in units of 1 ms after the CCA end point, method M40 sets l _DataStart = the TBS of the floating subframe can be calculated using Equation (1) to which _DataEnd = 13 is applied.

7.1.2. TBS  Determination method (method M41)

Method M41 obtains TBS using N _PRB defined by Equation (3) by a method similar to the method of defining N _PRB of a TBS table defined in 3GPP LTE according to a special subframe configuration.

는 데이터 전송 시 할당된 자원의 PRB(Physical RB) 개수이다. 여기서,

는 서비스되고 있는 시스템 대역폭에 따른 하향링크 시스템의 RB 개수를 의미한다(예, 20MHz 시스템의 경우에 100개).In Equation (3)

Is the number of PRBs (Physical RBs) of resources allocated in data transmission. here,

Means the number of RBs of the downlink system according to the system bandwidth being serviced (eg, 100 in the case of a 20 MHz system).

denotes a compensation value for reflecting the number of OFDM symbols actually using N _PRB when the number of OFDM symbols is different from a normal subframe, and is determined by the following method M41-1 or M41-2.

The method M41-1 is a method for determining? Corresponding to the DwPTS according to the number of OFDM symbols of the partial subframe, such as a special subframe configuration for DwPTS transmission defined in 3GPP LTE.

)으로, α를 결정하는 방법이다.Method M41-2 calculates the number of OFDM symbols actually used in the partial subframe based on all the OFDM symbols in one common subframe,

) Is a method for determining?.

Alternatively, the method M41-2 may determine? By using the following Equation (4), which reflects the number of OFDM symbols used for data transmission, excluding the OFDM symbol corresponding to the PDCCH region.

는 부분 서브프레임의 PDCCH 영역에 대응하는 OFDM 심볼의 개수를 나타낸다.In Equation (4)

Represents the number of OFDM symbols corresponding to the PDCCH region of the partial subframe.

는 일반 서브프레임의 PDCCH 영역에 대응하는 OFDM 심볼의 개수, 또는 TBS를 정의하기 위해 기 사용된 값(예, 3)을 나타낸다.In Equation (4)

Denotes the number of OFDM symbols corresponding to the PDCCH region of the general subframe, or a value (e.g., 3) used to define the TBS.

On the other hand, in the case of super TTI subframes (e.g., super TTI subframes SS1 and SS2 in Fig. 13B) composed of two subframes (e.g., partial subframe + general subframe) N _PRB for each constituent sub-frame of the frame can be obtained, and then the total TBS can be obtained.

7.2. Licensee  Sub-frame composition according to channel occupancy of band

Due to the diversity of the maximum channel occupation time constraints and the CCA timing due to the frequency operation restrictions in the license-exempt band, it is difficult for partial subframes to operate at the subframe boundaries. Therefore, the partial subframe can start / end transmission in arbitrary OFDM symbol units in the subframe. As described above, the partial subframe may be included in the first portion and the last portion in the COT, and the other subframes apply the LTF standard subframe definition.

-1번, 예,

=7인 경우에, OFDM 심볼 13번) 중 임의의 OFDM 심볼부터, 마지막 OFDM 심볼(OFDM 심볼 2×

-1번, 예,

=7인 경우에, OFDM 심볼 13번)까지의 OFDM 심볼 구간을 포함한다. 즉, COT에 속한 첫번째 부분 서브프레임은, 0~13번까지의 OFDM 심볼, 1~13번까지의 OFDM 심볼, ..., 또는 13~13번까지의 OFDM 심볼을 포함할 수 있다.The first partial subframe belonging to the COT includes the first OFDM symbol (OFDM symbol 0) to the last OFDM symbol (OFDM symbol 2 *

-1, yes,

= 7, OFDM symbol 13) from the last OFDM symbol to the last OFDM symbol (OFDM symbol 2 *

-1, yes,

= 7, OFDM symbol 13). That is, the first partial subframe belonging to the COT may include OFDM symbols from 0 to 13, OFDM symbols from 1 to 13, ..., or OFDM symbols from 13 to 13.

-1번, 예,

=7인 경우에, OFDM 심볼 13번) 중 임의의 OFDM 심볼까지의 OFDM 심볼 구간을 포함한다. 즉, COT에 속한 마지막 부분 서브프레임은, 0~0번까지의 OFDM 심볼, 0~1번까지의 OFDM 심볼, ..., 또는 0~13번까지의 OFDM 심볼을 포함할 수 있다.The last partial subframe belonging to the COT includes the first OFDM symbol (OFDM symbol 0) to the last OFDM symbol (OFDM symbol 2) from the first OFDM symbol (OFDM symbol 0)

-1, yes,

= 7, OFDM symbol 13), the OFDM symbol interval up to an arbitrary OFDM symbol is included. That is, the last partial subframe belonging to the COT may include OFDM symbols from 0 to 0, OFDM symbols from 0 to 1, ..., or OFDM symbols from 0 to 13.

이다. As shown in Table 4, the number of OFDM symbols is < RTI ID = 0.0 >

to be.

A reference signal (RS) included in data (PDSCH) during transmission of data (PDSCH) is demodulated RS (DM-RS), CRS, channel state information (RS) Is used for data transmission / reception and channel status measurement / reporting.

 In addition, devices operating in the license-exempt band may access and use the channel in accordance with the frequency regulation of the license-exempt band. Since one TTI is included in all or some OFDM symbols of a subframe, an adjustment to an area in which the RS is included (hereinafter referred to as an 'RS area') is required. On the other hand, when a part of the frame or the entire frame of the system is composed of time less than 1 ms (for example, one subframe having a length shorter than the length defined by 3GPP (for example, 0.5 ms or 1 slot size) Or when a certain section is constituted), the RS region adjusting method according to the embodiment of the present invention described below can be applied.

As illustrated in Figs. 18A and 18B, when only a part of one subframe is used for data transmission due to CCA, the following configuration methods (method M50, method M51, method M52, method M53, method M54) The RS region can be configured. In FIGS. 18A and 18B, for convenience of description, the OFDM symbol numbers in one subframe are numbered from 0 to 13. The OFDM symbols 0 to 6 are for the 1 < th > 13 is for the second slot. Particularly, OFDM symbols 7 to 13 mean OFDM symbols 0 to 6 of the second slot.

(A-1), (b-1) and (b-1) in FIG. 18A, ), (c-1) and (d-1) and (e-1) in FIG. 18b represent partial subframes including the adjusted RS region.

The method M50 is a method of shifting the PDCCH region of a general subframe by the number of the first OFDM symbol of the partial subframe to place the PDSCH region in the partial subframe and disposing the PDSCH region of the general subframe in the same position in the partial subframe. That is, the PDCCH region of the normal subframe is arranged in the partial subframe so as to start from the first OFDM symbol of the partial subframe, and the PDSCH region of the normal subframe is arranged at the same position in the partial subframe. For example, FIG. 18A illustrates a case where OFDM symbols 0 to 2 are set as a PDCCH region, FIG. 18A shows a case where the first OFDM symbol of the partial subframe is OFDM symbol 4 . In this case, the PDCCH areas corresponding to the OFDM symbols 0 to 2 of the normal subframe are arranged in the areas corresponding to OFDM symbols 4 to 6 of the partial subframe. In addition, the PDSCH regions corresponding to the OFDM symbols 7 to 13 of the normal subframe are arranged in the areas corresponding to OFDM symbols 7 to 13 of the partial subframe. For another example, it is assumed that the OFDM symbols 0 to 1 of the normal subframe are set to the PDCCH region, and the first OFDM symbol of the partial subframe is OFDM symbol 4. In this case, the PDCCH areas corresponding to the OFDM symbols 0 to 1 of the normal subframe are arranged in the areas corresponding to the OFDM symbols 4 to 5 of the partial subframe, and the OFDM symbols # 6 to # The PDSCH region corresponding to # 13 is allocated in an area corresponding to OFDM symbols # 6 to # 13 of the partial subframe.

The method M51 is a method of shifting the PDCCH region and the PDSCH region of the normal subframe by the number of the first OFDM symbol of the partial subframe. That is, the PDCCH region and the PDSCH region of the normal subframe are arranged to start from the first OFDM symbol of the partial subframe. For example, FIG. 18A illustrates a case where OFDM symbols 0 through 2 are set as PDCCH regions, FIG. 18B illustrates a case where the first OFDM symbol of the partial subframe is OFDM symbol 4 . In this case, the areas corresponding to the OFDM symbols 0 to 9 of the normal subframe are arranged in the areas corresponding to OFDM symbols 4 to 13 of the partial subframe.

The method M52 is a method of constructing the partial subframe in units of slots. More specifically, the method M52 shifts the first slot of the normal subframe by the number of the first OFDM symbol of the partial subframe and places it in the partial subframe, places the second slot of the normal subframe at the same position in the partial subframe . For example, FIG. 18A illustrates a case where OFDM symbols 0 to 2 are set as PDCCH regions, FIG. 18A shows a case where the first OFDM symbol of the partial subframe is OFDM symbol 3 . In this case, the areas corresponding to the OFDM symbols 0 to 3 of the first slot in the normal subframe are arranged in the areas corresponding to the OFDM symbols 3 to 6 of the first slot in the partial subframe, The PDSCH region corresponding to OFDM symbols 0 to 6 (OFDM symbols 7 to 13) of the second slot in the frame is OFDM symbols 0 to 6 (OFDM symbols 7 to 13) of the second slot in the partial subframe, 13). ≪ / RTI >

The method M53 is a method of arranging the PDCCH region of the normal subframe to start from the first OFDM symbol of the second slot in the partial subframe and disposing the PDSCH region of the normal subframe at the same position in the partial subframe. That is, the PDSCH region of the partial subframe is mapped to the OFDM symbol number for the PDSCH region of the normal subframe 1: 1. For example, FIG. 18 (d) illustrates a case where OFDM symbols 0 to 2 are set as a PDCCH region, FIG. 18 (d-1) illustrates a case where the first OFDM symbol of the partial subframe is OFDM symbol 3 . In this case, the PDCCH areas corresponding to the OFDM symbols 0 to 2 of the normal subframe are divided into the areas corresponding to OFDM symbols 0 to 2 (OFDM symbols 7 to 9) of the second slot in the partial subframe . The PDSCH areas corresponding to the OFDM symbols 3 to 6 of the normal subframe are arranged in the areas corresponding to the OFDM symbols 3 to 6 of the partial subframe and the OFDM symbols 10 to 13 of the normal subframe Is arranged in an area corresponding to OFDM symbols 10 to 13 of the partial subframe. On the other hand, according to the method M53, the positions of the resources (R0 to R3) for the CRS in the partial subframe are the same as the positions of the resources (R0 to R3) for the CRS in the normal subframe.

The method M54 is a method in which the second slot of the normal subframe is located in the first slot of the partial subframe and the first slot of the normal subframe is located in the second slot of the partial subframe. In particular, the second slot of the normal subframe is omitted by the number of the first OFDM symbol of the partial subframe, and the remainder is placed in the first slot of the partial subframe. For example, FIG. 18 (e) illustrates a case where OFDM symbols 0 to 2 are set as PDCCH regions, FIG. 18 (e-1) illustrates a case where the first OFDM symbol of the partial subframe is OFDM symbol 3 . In this case, the area corresponding to OFDM symbols 0 to 6 of the first slot in the normal subframe is divided into OFDM symbols 0 to 6 (OFDM symbols 7 to 13) of the second slot in the partial subframe And is disposed in the corresponding area. The area corresponding to OFDM symbols 3 to 6 (OFDM symbols 10 to 13) of the second slot in the normal subframe corresponds to OFDM symbols 3 to 6 of the first slot in the partial subframe Area.

19 is a view showing a partial sub-frame including an RS region when data is transmitted in a part of the last sub-frame within a range where the maximum COT is not exceeded. Specifically, FIG. 19A shows a general subframe including an RS region, and FIG. 19A-1 shows a partial subframe including an adjusted RS region. As illustrated in FIG. 19, the last subframe of the UCC occupancy channel may be configured to include as many OFDM symbols as the length of the last subframe (starting from OFDM symbol 0). The method illustrated in Fig. 19 is similar to method M51. For example, FIG. 19A illustrates a case where OFDM symbols 0 to 2 are set as a PDCCH region, FIG. 19A-1 shows a case where the last subframe belonging to the COT is a partial subframe, The case where the last OFDM symbol of the frame is the OFDM symbol 8 is exemplified. In this case, the PDCCH areas corresponding to the OFDM symbols 0 to 2 of the normal subframe are arranged in the areas corresponding to OFDM symbols 0 to 2 of the partial subframe, The PDSCH area corresponding to the 8th sub-frame is allocated in the area corresponding to OFDM symbols 3 to 8 of the partial sub-frame.

7.3. Licensee  Frame composition according to channel occupancy of band

As described above, in the case where the channel of the license-exempt band is occupied, the frame includes the first sub-frame, the last sub-frame, and the intermediate sub-frame and the initial signal transmitted as needed (Figs. 13A, 13B, ≪ / RTI > Specifically, the frame is configured within a range that does not exceed the maximum COT, as shown in Equation (5) below.

는 i번째 서브프레임의 전송 시간을 나타낸다.In Equation (5)

Represents the transmission time of the i-th subframe.

는 COT에 속하는 n개의 서브프레임들 중 1번째 서브프레임의 전송 시간을 나타내고,

는 COT에 속하는 n개의 서브프레임들 중 마지막 서브프레임의 전송 시간을 나타낸다.

Denotes the transmission time of the first subframe among the n subframes belonging to the COT,

Represents the transmission time of the last subframe among the n subframes belonging to the COT.

는 COT에 속하는 n개의 서브프레임들 중 중간 서브프레임(2^nd, 3^rd, ..., n-1^th)번째 서브프레임의 전송 시간을 나타낸다.

Represents the transmission time of the middle subframe (2 ^nd , 3 ^rd , ..., n-1 ^th ) th subframe among the n subframes belonging to the COT.

는 프레임에 초기 신호가 포함된 경우에, 초기 신호의 전송 시간을 나타낸다.

Represents the transmission time of the initial signal when the initial signal is included in the frame.

의 특성을 갖는다. 이 경우에, 점유 채널에 속한 첫번째 서브프레임은, 초기 신호 전송 직후의 첫번째 OFDM 심볼부터 해당 서브프레임의

번째 OFDM 심볼(마지막 OFDM 심볼)까지 포함하도록 구성될 수 있다. 구체적으로, 점유 채널에 속한 첫번째 서브프레임은 다음의 방법들(방법 M60, 방법 M61, 방법 M62, 방법 M63) 중 하나 또는 둘 이상의 조합을 통해, 구성될 수 있다.On the other hand, LTE has a characteristic that data transmission (TTI) is performed in 1 ms units in a subframe composed of OFDM. Due to the characteristics of the LTE, the first subframe excluding the initial signal among the subframes belonging to the occupied channel, as shown in Table 4,

. In this case, the first subframe belonging to the occupied channel is divided into the first OFDM symbol immediately after the transmission of the initial signal,

Th OFDM symbol (last OFDM symbol). Specifically, the first subframe belonging to the occupation channel can be configured through one or a combination of two or more of the following methods (method M60, method M61, method M62, method M63).

를 k로 설정하는 방법이다. 여기서, k는 OFDM 심볼 번호 in the 1ms TTI를 나타낸다. 구체적으로, k는 초기 신호 전송 이후 데이터 전송이 가능한 OFDM 심볼 번호로써, #0~2×

-1의 임의의 정수이다. Method M60 to Method M63,

Is set to k. Here, k represents an OFDM symbol number in the 1ms TTI. Specifically, k is an OFDM symbol number capable of data transmission after initial signal transmission,

-1. ≪ / RTI >

Method M60 is when partial subframes are not allowed (i.e., the same as setting k to 0). That is, when only a sub-frame of 1 ms is allowed, the method M60 configures the first sub-frame as shown in Table 5 below.

으로 설정하는 방법이다. 즉,

이고,

이다. 방법 M61은 첫번째 서브프레임을 아래의 표 6과 같이 구성한다. The method M61 is a method in which, when a partial subframe is configured in units of slots,

. In other words,

ego,

to be. Method M61 configures the first subframe as shown in Table 6 below.

로 설정하는 방법이다. 즉,

과

이고,

이다. 방법 M62는 첫번째 서브프레임을 아래의 표 7과 같이 구성한다. Method M62 is a method in which, when a subframe is configured in units of slots or 1 ms subframe (normal subframe), k is 0 or

. In other words,

and

ego,

to be. Method M62 configures the first subframe as shown in Table 7 below.

가 설정되는 경우에,

를 3GPP에서 정의되는 3, 9, 10, 11, 12, 6 중 하나로 설정하는 방법이다. 방법 M63은 첫번째 서브프레임을 아래의 표 8과 같이 구성한다. Method M63 is one of the configurable lengths of the DwPTS in the special subframe defined in LTE frame structure type 2 (TDD)

Is set,

Is set to one of 3, 9, 10, 11, 12, and 6 defined in 3GPP. Method M63 configures the first subframe as shown in Table 8 below.

의 특성을 갖는다. 수학식5의 조건을 만족하는 마지막 서브프레임의 가장 큰 OFDM 심볼 개수를 포함하도록, 서브프레임은 구성될 수 있다. 구체적으로, 점유 채널에 속한 마지막 서브프레임은 다음의 방법들(방법 M70, 방법 M71, 방법 M72, 방법 M73) 중 하나 또는 둘 이상의 조합을 통해, 구성될 수 있다.On the other hand, as shown in Table 4, the last subframe within the limited COT of the channel occupied after the CCA,

. The subframe may be configured to include the largest number of OFDM symbols of the last subframe satisfying the condition of Equation (5). Specifically, the last subframe belonging to the occupied channel can be configured through one or a combination of two or more of the following methods (method M70, method M71, method M72, method M73).

를 m으로 설정하는 방법이다. 여기서, m은 1ms TTI 내에서의 OFDM 심볼 번호를 나타낸다. 구체적으로, m은 수학식5의 조건을 만족하는 OFDM 심볼 번호로써, 0에서 2×

-1 사이의 임의의 정수이다. Method M70, Method M71, Method M72, and Method M73

Is set to m. Here, m represents an OFDM symbol number within a 1 ms TTI. Specifically, m is an OFDM symbol number satisfying the condition of Equation (5)

-1. ≪ / RTI >

로 설정하는 방법과 동일하게 운용(설정)될 수 있다. 즉, 1ms 단위의 서브프레임(노멀 서브프레임)만 허용되는 경우에, 방법 M70은 마지막 서브프레임을 아래의 표 9와 같이 구성한다.The method M70 determines whether a partial subframe is m

Can be operated (set) in the same manner as in the method of setting the parameter value. That is, when only a sub-frame (normal sub-frame) of 1 ms unit is allowed, the method M70 configures the last sub-frame as shown in Table 9 below.

또는

로 설정하는 방법이다. 즉,

이고,

이다. 방법 M71은 마지막 서브프레임을 아래의 표 10과 같이 구성한다. The method M71 is a method in which, when a partial subframe is configured in units of slots,

or

. In other words,

ego,

to be. Method M71 constructs the last subframe as shown in Table 10 below.

또는

로 설정하는 방법이다. 즉,

이고,

이고,

이다. 방법 M72는 마지막 서브프레임을 아래의 표 11과 같이 구성한다. In the method M72, when a subframe is configured in units of slots or 1 ms subframe (normal subframe), m

or

. In other words,

ego,

ego,

to be. Method M72 configures the last subframe as shown in Table 11 below.

가 설정되는 경우에,

를 3GPP에서 정의되는 3, 9, 10, 11, 12, 6 중 하나로 설정하는 방법이다. 방법 M73은 마지막 서브프레임을 아래의 표 12와 같이 구성한다. Method M73 is one of the configurable lengths of DwPTS in the special subframe defined in LTE frame structure type 2 (TDD)

Is set,

Is set to one of 3, 9, 10, 11, 12, and 6 defined in 3GPP. Method M73 configures the last subframe as shown in Table 12 below.

~

이고, 초기 신호가 전송되는 구간은

을 의미한다. Meanwhile, from the time when the CCA is performed / terminated, until the initial signal is transmitted (i.e., the period during which the data is transmitted and the period during which the initial signal is transmitted), the base station transmits an arbitrary signal (blocking signal; A signal including the same information as the information of the signal, or an arbitrary dummy signal, etc.) to prevent channel occupation by another license-exempt band operating apparatus. In particular,

~

And the period during which the initial signal is transmitted is

.

Now, a method of constructing a frame in the COT according to Equation (5) will be described in detail with reference to FIGS. 20 to 26. FIG. Hereinafter, it is assumed that the maximum COT is C (= a predetermined time such as 4, 10, 13) ms and that the initial signal can be changed by one OFDM symbol length (e.g., OFDM symbol unit such as 0, 2, ). Hereinafter, a blocking signal is used for the purpose of terminating a CCA and performing an operation on an OFDM symbol basis or preventing a channel access by another license-exempt band operating apparatus, and may be a unit smaller than an OFDM symbol, an OFDM symbol unit, It is assumed that it can have time such as a larger unit.

A subframe in which only the first subframe, the last subframe, and the intermediate subframe are not subframes consisting of only some OFDM symbols in one TTI, only the first subframe or only the last subframe consists of only some OFDM symbols in one TTI, Lt; / RTI > Hereinafter, it is assumed that one of the first subframe and the last subframe, or both the first subframe and the last subframe are subframes composed of only some OFDM symbols in one TTI.

An intermediate subframe excluding the first subframe and the last subframe among the subframes belonging to the COT has a TTI length (defined as 1 ms in LTE) in one subframe unit. If the first subframe and the last subframe are partial subframes composed of only some OFDM symbols in the subframe as described above, the first subframe and the last subframe can satisfy Equation (6) below.

In Equation (6), n (= 0, 1, ..., C)? C.

The length of the last subframe may be inferred through the first subframe, the initial signal, and the blocking signal through equations (5) and (6), the initial signal or the predefined method (last subframe mapping according to the first subframe, etc.) Lt; / RTI >

On the other hand, a case where a subframe of an occupied channel includes a subframe of a slot unit (for example, 0.5 ms) will be described.

20 is a diagram showing the first sub-frame, the intermediate sub-frame, and the last sub-frame of the occupation channel. In Fig. 20, the start and end of the first subframe are performed in units of slots.

As illustrated in (f1), (f2), and (f5) in FIG. 20, if the CCA ends before the start of a slot, the base station transmits an initial signal or blocking signal until the start of the slot, Data can be transmitted while preventing occupation of the channel by the band operating device.

As illustrated in (f3) and (f6) of FIG. 20, the first subframe includes the initial signal and may be configured in units of slots.

As illustrated in FIG. 20 (f4), the first subframe may be limited to a subframe length of 1 ms TTI.

In addition, as illustrated in (f7) of FIG. 20, the base station may perform CCA, initial signal transmission, blocking signal transmission, and the like, instead of transmitting the PDCCH in the PDCCH region in the first subframe.

For this, the base station can be defined (or set) to perform the CCA (start and end) as follows, reflecting the LTE characteristics composed of subframes and OFDM symbols. Specifically, the base station can be set (operated) to perform (start, end) the CCA before the sub-frame boundary, before the PDCCH end (PDSCH start or EPDCCH start), or before the slot boundary. The base station can notify (set) a data transmission time point to the terminal and allow the terminal to perform an operation for data reception at the time of data transmission. In particular, the data transmission time may include the size (or start / end position) of the first / last subframe, and the UE may recognize the data transmission time point .

In particular, the CCA section definition complies with the license-exempt band frequency operation regulations. When the base station wants to occupy (or use) additional channels after expiration of the COT, it operates according to the subframe time synchronization (eg, HARQ ACK / (Or use) in the case of uplink data transmission in response to a UL grant and data transmission with a certain period of time (eg, DRS (Dedicated RS), etc.) You can do it together.

The base station can perform the CCA on the PDCCH transmission interval (e.g., OFDM symbols 0 to 3).

Alternatively, when the base station performs the additional data transmission after the previous data transmission, the PDCCH transmission interval in the subframe arriving first since the previous data transmission (for example, OFDM symbol 0 (Start, end) before the first to third times. Specifically, when the last subframe of the previous data transmission ends in some OFDM symbol in the PDCCH transmission interval in the subframe, the BS can perform (start, end) the CCA in the PDCCH transmission interval. When the last subframe of the previous data transmission is terminated after the PDCCH transmission interval in the subframe, the base station determines the interval corresponding to the DwPTS defined in the TDD frame (e.g., OFDM symbol 2, 8, 9, 11 ) Before the CCA can be performed (start, end).

In the case where the intermediate subframe newly transmitted after the second slot guarantees the COT by an integral TTI, the intermediate subframe may be constituted by subframes of a general TTI as illustrated in (m1) of FIG. 20, May be configured in units of slots, as illustrated in (m2) of 20.

Alternatively, as illustrated in (m3) and (m4) in FIG. 20, instead of transmitting the PDCCH in the PDCCH region in the intermediate subframe, the base station may transmit a blocking signal (or an initial signal or a blocking signal + initial signal) Transmission, or CCA.

As illustrated in (l1), (l2), and (l3) of FIG. 20, the last subframe may be transmitted according to the slot end time or the TTI end time. Alternatively, as illustrated in (14) in FIG. 20, the last subframe may be a subframe in the slot unit according to Equations (5) and (6), or a subframe corresponding to the longest applicable length among the lengths defined in the DwPTS Frame. For example, in (14) of FIG. 20, the case where the last subframe corresponds to the special subframe configuration No. 9 is exemplified.

21 and 22 are diagrams illustrating a case where the first subframe and the last subframe of the occupied channel are composed of a slot (a 1/2 full subframe or a slot-based subframe) or a normal full subframe according to an embodiment of the present invention . 21 and 22, it is assumed that max COT < = k (ms).

21, the PDCCH + PDSCH region of the first subframe (subframe n) after the CCA has a slot length (1/2 TTI length) and the PDCCH + PDSCH region of the last subframe (subframe n + k) And has a normal subframe length (one TTI length). 22, the PDCCH + PDSCH region of the first subframe (subframe n + 1) after the CCA has the normal subframe length (one TTI length) and the PDCCH + PDSCH of the last subframe (subframe n + k + The area has a time slot length (1/2 TTI length).

23 and 24 show a case where only the first subframe of the occupied channel is composed of a slot (1/2 full subframe or slot-based subframe) or a normal subframe. 23 and 24, it is assumed that max COT < = k (ms).

Specifically, in FIG. 23, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) of the occupied channel has a time slot length (1/2 TTI length) The PDCCH + PDSCH region of the remaining subframes (sub-frames n + 1, n + 2, ..., n + k) has a normal subframe length (one TTI length). In FIG. 24, the PDCCH + PDSCH region of the first subframe (subframe n + 1 or subframe n + k + 1) of the occupied channel has a normal subframe length (one TTI length) The PDCCH + PDSCH region of the remaining subframes (e.g., subframes n + 2, n + 3, ..., n + k) has a normal subframe length (1 TTI length) .

The base station aligns the start timing of the slot with the initial signal and the blocking signal, and constructs (or transmits) the subframe according to the start of the slot or the normal subframe.

When the last subframe is configured to have a length of 1 ms or 1 slot, the base station transmits the last subframe (subframe n + 1) within the maximum COT in the first slot (within one TTI) (subframe n + 1) and release the occupied channel, as illustrated in FIGS. 21, 23, and 24, k and may terminate the occupied channel.

The base station may perform a CCA (hereinafter, referred to as a "first CCA") to initially access (or occupy, use) a channel and a CCA (hereinafter referred to as a "second CCA") to re- have. Since the last subframe of the COT by the first CCA is composed of slots or general subframes, the subframe after the second CCA may be determined according to the last subframe in the previous COT. For example, as illustrated in FIGS. 21, 23, and 24, when the last subframe (subframe n + k) of the COT by the first CCA is composed of a general subframe, The PDCCH + PDSCH region in the first subframe (subframe n + k + 1) of the COT has a slot unit length (1/2 TTI length). 22, the PDCCH + PDSCH region in the last subframe (subframe n + k + 1) of the COT by the first CCA has a time slot length (1/2 TTI length) , The PDCCH + PDSCH region in the first subframe (subframe n + k + 2) of the COT by the second CCA has a normal subframe length (one TTI length).

(H), (i), (j), and (k) of FIGS. 21A, 21B, 21C, 21D, 21E, 21F, ), (l), (m), and (n) have different execution times of the first CCA.

23 (a), 23 (b), 23 (c), 23 (d), 23 (e) (k), (l), (m), and (n) have different execution times of the first CCA.

On the other hand, the case where the first subframe is composed of a general subframe (1 ms TTI length) or a partial subframe as long as defined by the DwPTS will be described.

As illustrated in FIGS. 25 and 26, the longest DwPTS among the DwPTS that can be used within the length (or time) from the CCA end point to the start of the next subframe can be applied to the first subframe. Specifically, the configuration of the first subframe can be determined according to the CCA end point and the initial signal transmission point, as shown in Table 13 below.

FIG. 25 and FIG. 26 show a case where the PDCCH + PDSCH region of a subframe belonging to an occupied channel has a DwPTS length or a normal subframe length (1 TTI length). 25 and 26, it is assumed that max COT < = k (ms).

As illustrated in FIGS. 25A and 25B, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) of the subframes belonging to the occupied channel has a special subframe configuration 4, or the length of the DwPTS for the special subframe configuration 2/7, and the PDCCH + PDSCH area of the last subframe (subframe n + k) may have the length of the normal subframe length (one TTI length ).

As illustrated in (c) of FIG. 25, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) of the subframes belonging to the occupied channel has a special subframe configuration 2/7 And the PDCCH + PDSCH region of the last subframe (subframe n + k) may have a normal subframe length (one TTI length).

As illustrated in (d) of FIG. 25, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) of the subframes belonging to the occupied channel has a special subframe configuration 2/7 And the PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS for the special subframe configuration 0/5, Lt; / RTI >

As illustrated in (e) of FIG. 25, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) of the subframes belonging to the occupied channel has a special subframe configuration 1/6 And the PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS for the special subframe configuration 0/5, Lt; / RTI >

As illustrated in (f) and (g) of FIG. 25, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 1) 9, and the PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have the length of the DwPTS for the special subframe configuration 0/5.

As illustrated in (h) and (i) of FIG. 26, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 2) The PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS for 0/5 or a normal subframe length (one TTI length) DwPTS. ≪ / RTI >

As illustrated in (j) of FIG. 26, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 2) of the subframes belonging to the occupied channel has a special subframe configuration 0/5 And the PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS for the special subframe configuration 1/6 or a normal subframe length It can have a length.

As illustrated in (k) of FIG. 26, the PDCCH + PDSCH region of the first subframe (subframe n or subframe n + k + 2) of the subframes belonging to the occupied channel has a special subframe configuration 0/5 The PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS for the special subframe configuration 2/7 or a normal subframe length It can have a length.

The PDCCH + PDSCH region of the first subframe (subframe n + 1, or subframe n + k + 2) of the subframes belonging to the occupied channel has a common subframe length ( 1 TTI length) or the length of the DwPTS for the special subframe configuration 4, and the PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have a length of DwPTS Lt; / RTI >

As illustrated in (m) and (n) of FIG. 26, the PDCCH + PDSCH region of the first subframe (subframe n + 1 or subframe n + k + 2) The PDCCH + PDSCH region of the last subframe (subframe n + k + 1) may have the subframe length (one TTI length) or the length of DwPTS for the special subframe configuration 4, Lt; RTI ID = 0.0 > DwPTS < / RTI >

Figures 25 (a), (b), (c), (d), (e), (f) ), (l), (m), and (n) have different CCA end points and different initial signal transmission points.

27 is a diagram showing a configuration of a base station 100 according to an embodiment of the present invention.

Specifically, the base station 100 includes a processor 110, a memory 120, and a radio frequency (RF) converter 130.

The processor 110 may be configured to implement the procedures, functions, and methods described herein in connection with a base station.

The memory 120 is coupled to the processor 110 and stores various information related to the operation of the processor 110. [

RF converter 130 is coupled to processor 110 and transmits or receives radio signals. The base station 100 may have a single antenna or multiple antennas.

28 is a diagram showing a configuration of a terminal 200 according to an embodiment of the present invention.

Specifically, the terminal 200 includes a processor 210, a memory 220, and an RF converter 230.

The processor 210 may be configured to implement the procedures, functions, and methods described herein in connection with a terminal.

The memory 220 is coupled to the processor 210 and stores various information related to the operation of the processor 210. [

The RF converter 230 is connected to the processor 210 and transmits or receives a radio signal. The terminal 200 may have a single antenna or multiple antennas.

29 is a diagram illustrating a computer system 300, in accordance with an embodiment of the present invention.

Embodiments of the present invention may be implemented within a computer system (e.g., computer readable media, etc.). As illustrated in FIG. 29, computer system 300 may include at least one processor 310, memory 320, and storage 330. In addition, the computer system 300 may further include a communication interface 340. The communication interface 340 may include a network interface 341 connected to the network 400. In addition, the computer system 300 may further include a user input device 350 and a user output device 360. Each configuration 310-360 may communicate via bus 370. [

 The processor 310 may be a central processing unit (CPU) or a semiconductor device that executes the memory 320 or the processing instructions stored in the storage 330. Memory 320 and storage 330 may include various forms of volatile or non-volatile storage media. For example, the memory 320 may include a read-only memory (ROM) 321 and a random access memory (RAM)

Thus, embodiments of the present invention may be implemented in a computer implemented method or in a non-transitory computer readable medium with computer executable instructions stored thereon .

In an embodiment of the present invention, when computer-executable instructions are executed by the processor 310, the computer-executable instructions perform the method according to at least one aspect of the invention .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (1)

A communication method of a base station in an environment in which a first carrier of a license band frequency and a second carrier of a license-exempt band frequency are carrier aggregated,
Commanding the terminal via at least one of the first carrier and the third carrier of the license-exempt band frequency to activate the second carrier;
Receiving, from the terminal, channel state information for the second carrier through the first carrier; And
Transmitting data to the terminal through the second carrier
And a base station.

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