KR20160037766A - Method and apparatus for managing allocation and usage of radio resource, method and apparatus for transmitting data through unlicensed band channel, and method and apparatus for managing access of radio resource - Google Patents

Abstract

Provided is a method for a transmitter to transmit periodic first data through a channel of an unlicensed band. The transmitter adjusts at least one from a transmission view point of the first data and a clear channel assessment (CCA) view point on the channel, to occupy the channel. The transmitter performs CCA on the channel in the CCA view point, and determines whether to occupy the channel or not. And the transmitter transmits the first data in the transmission view point of the first data through the channel when the channel can be occupied.

Description

TECHNICAL FIELD [0001] The present invention relates generally to a method and apparatus for managing radio resource allocation and usage, a method and apparatus for transmitting data over a channel in a license-exempt band, and a method and apparatus for managing radio resource access AND APPARATUS FOR TRANSMITTING DATA THROUGH UNLICENSED BAND CHANNEL, AND METHOD AND APPARATUS FOR MANAGING ACCESS OF RADIO RESOURCE}

The present invention relates to a method and apparatus for managing the allocation and use of radio resources. The present invention also relates to a method and apparatus for managing and controlling efficient data transmission through management of radio resource access in a mobile radio access system.

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.

On the other hand, if two or more identical or heterogeneous systems (or devices) attempt to transmit data at the same time in a wireless access system, the receiving apparatus may not receive data properly due to interference. For example, it is assumed that a first transmitting apparatus transmits data to a first receiving apparatus, and a second transmitting apparatus simultaneously transmits data to a second receiving apparatus. When the first receiving apparatus receives data from the first transmitting apparatus, interference may occur due to data received from the second transmitting apparatus. Likewise, when the second receiving apparatus receives data from the second transmitting apparatus, interference may occur due to data received from the first transmitting apparatus. Due to this interference, the first receiving device and the second receiving device may not properly receive data.

To solve this problem, there is a need for a method that enables each device to efficiently access resources. In particular, in a frequency band (eg, license-exempt band, TV white space, etc.), a frequency access management method based on frequency regulation for operation at the frequency is required.

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.

It is another object of the present invention to provide a method and apparatus for efficiently accessing radio resources.

According to an embodiment of the present invention, a method is provided in which a transmitter transmits first data having periodicity through a channel in an unlicensed band. The transmitting method of the transmitter may include adjusting at least one of a transmission time of the first data and a clear channel assessment (CCA) time point for the channel to occupy the channel; Performing a CCA for the channel at the CCA time point to determine whether the channel can be occupied; And transmitting the first data over the channel at the time of transmission of the first data when the channel can be occupied.

The adjusting step adjusts a transmission offset for the transmission time point of the first data so that the transmission time point of the first data does not overlap with the time point at which another device transmits data having periodicity through the channel Step < / RTI >

The determining may comprise performing a CCA on the channel continuously until the channel can be occupied regardless of a transmission offset for a transmission time point of the first data.

The transmitting step may include transmitting the first data at a time point when the channel can occupy the time point other than the time point at which the first data is to be transmitted. And notifying the receiver that the first data is transmitted to the receiver to receive the first data at a time other than the predetermined time.

Wherein when the first data is not transmitted within a previous transmission period for the first data, the adjusting step may include a step of adjusting a time point at which the CCA starts earlier than a point in time at which the CCA is started within the previous transmission period And setting the CCA time point.

Wherein the step of setting the CCA time point comprises: determining a first duration between a transmission time point of the first data and a CCA end point determined by a transmission offset for the first data, And setting the CCA time point to a time point at which the CCA starts within the previous transmission period when the sum of the two periods exceeds the limit occupancy time for the channel.

The transmitting step may include a special signal for preventing occupation of the channel by another device from the end of the CCA to the transmission of the first data when the channel can be occupied And transmitting through the channel.

Wherein the transmission method of the transmitter comprises the steps of: when the first data is successfully transmitted through the channel, transmitting the first data by the transmission offset of the first data within the next transmission period for the first data; And setting a CCA time point for the next transmission period so that the CCA ends before the transmission time point.

The transmitter may be a base station, and the first data may be a discovery signal (DRS).

The transmitter may be a terminal, and the first data may be an uplink signal transmitted to a base station.

According to another embodiment of the present invention, there is provided a method for transmitting a first data having a periodicity and a second data having an aperiodicity on a channel through a license-exempt band. The transmission method of the transmitter may include a first CCA (clear channel assessment) for transmission of the first data, a second CCA for transmission of the second data, and a second CCA for transmission of the second data, Adjusting at least one of transmission of two data; And transmitting the first data over the channel to a first point of time determined by a transmission offset of the first data when occupying the channel through at least one of the first CCA and the second CCA, .

The transmitting method of the transmitter may further include transmitting the second data through the channel when the channel occupies the second CCA before the adjusting step.

The adjusting step may include an early termination of the transmission of the second data to secure a duration in which the first CCA is performed.

The adjusting step may include omitting the first CCA when occupying the channel through the second CCA.

The transmitting step may include transmitting the first data and the second data using the channel occupied through the second CCA.

The adjusting step may include omitting the second CCA when occupying the channel through the first CCA.

The transmitting may include transmitting the second data after transmitting the first data using the channel occupied by the first CCA.

Wherein the adjusting step delays the time point of the second CCA after the time point when the first data is transmitted when the time interval between the time point at which the second data is transmitted and the first time point is less than a predetermined value Step < / RTI >

According to another embodiment of the present invention, there is provided a method of transmitting a first data having a periodicity and a second data having an aperiodicity on a channel through a license-exempt band. The transmission method of the transmitter may include a first duration in which clear channel assessment (CCA) for transmission of the first data is performed so as to increase the possibility of channel occupation for transmission of the first data, Adjusting at least one of a second period during which the CCA for data transmission is performed and a transmission period length of the first data; Performing a CCA during the first period; And transmitting the first data using the channel when occupying the channel through the CCA.

Wherein the adjusting comprises: reducing at least one of a number of CCA unit time and a length of the CCA unit time for the first period; And determining the first period by multiplying the number of CCA unit times by the length of the CCA unit time.

Wherein the adjusting step includes a step of adjusting a first range which is a range of values that the number of CCA unit times for the first period can have and a second range which is a range of values that the number of CCA unit times for the second period can have 2; And determining the first period by multiplying the number of CCA unit times selected in the first range by the length of the CCA unit time for the first period.

Wherein the adjusting step includes a step of, when the first data is not transmitted within a previous transmission period for the first data, Decreasing or maintaining a range and increasing a second range that is a range of values that the number of CCA unit times for the second period may have; Selecting a number of CCA unit times for the first period within the first range; And determining the first period by multiplying the number of the selected CCA unit time by the length of the CCA unit time for the first period.

The adjusting may include reducing a transmission period length of the first data when the first data can not be transmitted within a previous transmission period for the first data.

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.

According to an embodiment of the present invention, a transmitting apparatus performs radio resource access, a receiving apparatus performs radio resource access, or a receiving apparatus assists a transmitting apparatus for data transmission of a transmitting apparatus, The device of the access system can efficiently access radio resources.

Also, according to the embodiment of the present invention, operations such as selection and management of a channel for data transmission can be efficiently performed.

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 showing a format and a transmission period of a discovery signal (DRS) periodically transmitted by a base station.
FIG. 30 is a diagram showing a method of transmitting the DRS by applying the license-exempt band frequency rule. FIG.
31 is a diagram illustrating a method of accessing resources through a clear channel assessment (CCA) in accordance with a license-exemption band frequency regulation.
32 is a diagram illustrating a channel search procedure according to an embodiment of the present invention.
33A, 33B, 33C, 33D, 33E, and 33F are views showing a channel search method according to an embodiment of the present invention.
34 is a diagram illustrating a data transmission procedure by channel state evaluation according to an embodiment of the present invention.
35 is a diagram showing a situation in which a signal arriving area of a transmitting apparatus and a receiving apparatus are different.
36 is a diagram illustrating a method of transmitting periodic data by changing a data transmission time according to an embodiment of the present invention.
37 is a diagram illustrating a method of transmitting periodic data by changing a CCA time according to another embodiment of the present invention.
38A, 38B, 38C, 38D, and 38E illustrate a method for transmitting periodic data and aperiodic data by changing the CCA time according to another embodiment of the present invention.
39A and 39B are views showing a frame structure for cellular operation at an unlicensed band frequency according to an embodiment of the present invention.
40 is a diagram illustrating a special signal for periodic data transmission according to an embodiment of the present invention.
41 is a diagram showing a section requiring a special signal.
42 is a diagram illustrating a method of using a reference signal as a special signal according to an embodiment of the present invention.
43 is a diagram illustrating a special signal for a subframe in which a synchronization signal is transmitted, according to another embodiment of the present invention.
44A, 44B, and 44C are diagrams illustrating a method of transmitting a special signal in a partial area of a subframe according to another embodiment of the present invention.
45 is a diagram showing a configuration of a transmitting apparatus according to an embodiment of the present invention.
46 is a diagram showing a configuration of a receiving apparatus according to 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 mobile subscriber station (SS), a portable subscriber station, an access terminal (AT), a user equipment (UE) AMS, HR-MS, SS, mobile subscriber station, 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.

1. How to manage radio resource allocation and usage

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.

1.1. 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.

1.2. 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.

1.3. 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.

1.4. 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.

1.4.1. 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.

1.4.2. 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.

1.5. 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.

1.6. 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.

1.7. 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.

1.7.1. 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.

1.7.1.1. 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.

1.7.1.2. 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.

1.7.2. 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.

1.7.3. 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.

Processor 110 may be any of the above-described " 1. Functions, and methods described in connection with a base station in " Methods for Managing Radio Resource Allocation and Usage. &Quot;

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.

Processor 210 may be configured as described above. Functions, and methods described in connection with a terminal in a " method for managing radio resource allocation and usage ".

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.

2. How to manage radio resource access

29 is a diagram showing a format and a transmission period of a discovery signal (DRS) periodically transmitted by a base station.

The base station may simultaneously serve periodic data transmission and aperiodic data transmission. The base station does not provide the current service to the terminal but periodically transmits the search signal DRS to notify that the service can be provided or to allow the terminal to search the base station. Specifically, FIG. 29 shows a DRS measurement timing configuration (DMTC).

As illustrated in FIG. 29, DRS may be transmitted over a period of 40, 80, 160 msec (DMTC period). The point at which DRS is transmitted is determined by a specific offset (DMTC offset) within the DMTC period. The base station transmits a DRS that can be detected by the terminal during a DMTC occasion duration or a DRS occasion period. Here, the DMTC allocation period may have a length of 5 msec (5 subframes) at a minimum of 1 msec (1 subframe) for a frequency division duplex (FDD), at least 2 msec (2 subframes) for a time division duplex ) Can have a maximum length of 5 msec (5 subframes).

The DRS is transmitted in a predetermined format at a predetermined time period through the setting of the DMTC cycle, the DMTC offset, and the DMTC allocation period. The MS can perform the BS search using the DRS. One or more base stations may transmit DRS based on the DMTC cycle, DMTC offset, and DMTC allocation period set for each base station, or may transmit through several channels (carriers) of frequency.

29, when a base station transmits a cell-specific reference signal (CRS), a primary synchronization signal (PSS), and a secondary synchronization signal (SSS) in a subframe (e.g., five subframes) belonging to the DMTC allocation period . The CRS is transmitted on antenna port 0 within all downlink subframes (including the downlink pilot time slot (DwPTS) of the special subframe). The PSS is transmitted in the first subframe of the subframe belonging to the DMTC allocation period in the case of FDD and in the second subframe of the subframe belonging to the DMTC allocation period in the case of TDD. The SSS is transmitted in the first subframe of the subframes belonging to the DMTC assignment period.

On the other hand, when devices share a frequency (in the case of using a shared band or a license-exempt band), there is a need for a resource approach that can apply the existing frequency regulation and transmit data. This will be described with reference to FIG.

FIG. 30 is a diagram showing a method of transmitting the DRS by applying the license-exempt band frequency rule. FIG. Specifically, FIG. 30 shows how a plurality of base stations LL1, LL2, and LL3 apply frequency regulation, access and occupancy resources, and transmit their DRSs through occupied resources.

Each of the base stations LL1, LL2, and LL3 performs a clear channel assessment (CCA) in order to transmit DRS. FIG. 2 illustrates a case where each of the base stations LL1 to LL3 performs both a normal CCA and an extended CCA (Ext-CCA). T _CCA indicates the time at which the general CCA is performed, and T _{Ext - CCA} indicates the time at which the extended CCA is performed. The CCA can be performed not only by the base station but also by the terminal. And, T _MAX indicates the maximum channel occupation time according to the frequency operation regulation in the license-exempt band, and the channel occupation time of the base station (LL 1 ~LL 3) can not exceed T _MAX .

Each of the base stations LL1 to LL3 can access and occupy resources in the license-exempt band according to the result of the CCA. That is, the base stations LL1 to LL3 transmit DRS when resource access and data transmission are possible due to the CCA.

However, due to the occupation and use of the channel of the base station LL1, the base station LL3 can not access the channel reflecting the characteristics of the DRS (e.g., having periodicity and being transmitted at a fixed point in time). That is, the base station LL3 can not transmit the DRS at the DRS transmission time determined by the DMTC offset within the DMTC period due to the channel occupancy of the base station LL1. In this case, there is a need for a way to efficiently share the frequency (resource access and occupancy).

31 is a diagram illustrating a method of accessing resources through a clear channel assessment (CCA) in accordance with a license-exemption band frequency regulation. Specifically, FIG. 31 shows the CCA that the device performs to access and occupy the license-exempt band frequency resource according to the license-exempt band frequency regulation prescribed by the European Telecommunications Standards Institute (ETSI). T _COT represents a channel occupation time, and T _Frame represents a fixed frame period, which is T _COT + T _idle . Here, T _idle represents an idle time, T _CCA or T _{Ext - CCA} .

31 (A) shows a frame based equipment (FBE) in which the apparatus performs a CCA based on a fixed period and occupies a channel according to a CCA result. The device may perform a short control signaling transmission within the T _COT . T _control represents the time at which the control signaling transmission is performed.

31 (B) shows an additional CCA (Extended CCA) when the channel size measured in the initial CCA process (transmission strength of a signal transmitted by another device) is equal to or higher than a certain threshold level (TL) LBE (load based equipment). The device may perform a short control signaling transmission within the T _COT . T _control indicates the time at which the control signaling transmission is performed and may be less than 0.05 x 50 ms.

On the other hand, as illustrated in FIG. 31, the resource access method through the CCA, which applies the frequency regulation of the license-exempt band, does not consider cellular operation (LTE (Long Term Evolution) operation). Therefore, there is a need for a way to efficiently and appropriately access and use radio resources in a license-exempt or shared band, while respecting the frequency regulation of the license-exempt band while considering LTE operation. In this specification, for convenience of explanation, a "license-exempt band or a shared band" is referred to as a license-exempt band.

2.1. wireless Accessing Resources  Channel search, channel condition evaluation assessment ), And channel operation

In this specification, when the transmitting apparatus (transmitter) is a base station, the receiving apparatus (receiver) is a terminal, and when the transmitting apparatus is a terminal, the receiving apparatus may be a base station.

Embodiments of the present invention may be applied to a downlink communication (or downlink service, downlink) from a base station to a terminal, uplink communication (or uplink service, uplink) from a terminal to a base station, , D2D (device to device) communication, direct link service). As used herein, the term " service " includes a downlink service, an uplink service, and a direct link service, unless otherwise specified.

In order to explain the channel search, the channel state evaluation, and the channel operation according to the embodiment of the present invention, the terms (idle channel, occupied channel, operational channel, and operation channel) used in this specification are defined as follows. An idle channel means a channel in which no service is performed through the channel or a service is being performed but it is determined that data transmission is not being performed by any device. The occupied channel means a channel in which it is determined that a specific device performs or performs data transmission through a corresponding channel for a service. The operable channel means a channel in which a service is not performed, or a channel determined to be capable of performing a service. An operation channel means a channel in which a data service is attempted or a service is performed among the operable channels.

2.1.1. Channel navigation

32 is a diagram illustrating a channel search procedure according to an embodiment of the present invention.

The channel search is a function required in the following cases, and can be performed by a transmitting apparatus or a receiving apparatus. The device can perform a channel search to find a usable channel (serviceable channel). Or the apparatus may perform a channel search in order to perform data service through the operable channel. Alternatively, the apparatus may perform a channel search (e.g., FIG. 33) when a channel search is required by a request or the like. Alternatively, the apparatus may perform a channel search before the data service in order to occupy the channel based on the channel search result of the receiving apparatus to service the data. Alternatively, To find out whether the operating channel is continuously operational, a channel search may be performed. Alternatively, the device may perform a channel search if it wishes to change the operational channel to another operable channel.

Specifically, the number of channels to be searched is set (S10).

The device measures the state of the i-th channel among the search target channels (S110).

The device determines whether the i-th channel is a service operable channel through channel search (S12).

If the i-th channel is a service operable channel, the apparatus includes the i-th channel in the operable channel group (S13). That is, the device stores the i-th channel as the k-th operable channel, and increases the value of k (S14).

If the i-th channel is not a service operable channel, the device determines that the i-th channel is an unavailable channel (S15).

The apparatus repeats the above-described processes (S11 to S15) by the number of search target channels.

On the other hand, when the apparatuses service data using one of the operable channels belonging to the operable channel group, the apparatus changes the corresponding operable channel as an operating channel.

Meanwhile, the operable channel determination procedure (S11 to S15) performed by the device in the channel search is a procedure for determining whether the channel to be searched is an operable channel or an inoperable channel. Specifically, when searching for a channel, the device determines whether or not the service can be normally operated due to channel conditions such as whether the other device is operating the service through the corresponding channel or the other device is operating the service through the corresponding channel, It is possible to determine whether or not the corresponding channel is the operable channel. The channel search procedure including the procedure for determining whether or not the channel is available may be performed by a transmitting apparatus or a receiving apparatus.

33A, 33B, 33C, 33D, 33E, and 33F are views showing a channel search method according to an embodiment of the present invention.

In the channel search method illustrated in FIGS. 33A to 33F, the transmitting apparatus (transmitter) and the receiving apparatus (receiver) may vary according to a service provided through a channel. Specifically, when a service provided through a channel is a downlink service, the transmitting apparatus is a base station and the receiving apparatus is a terminal. Alternatively, when the service provided through the channel is an uplink service, the transmitting apparatus is a terminal and the receiving apparatus is a base station. Alternatively, when the service provided through the channel is a direct link service, the transmitting apparatus is a terminal to transmit data, and the receiving apparatus is a terminal that receives data.

The channel search method illustrated in FIG. 33A (hereinafter referred to as a 'first channel search method') is a method in which a transmitting apparatus and a receiving apparatus can transmit / receive data in a state in which a new operating channel is added, The present invention can be applied to a case where the operating channel to which the data transmission / reception is currently performed is re-selected by re-determining whether or not the operating channel is suitable.

Specifically, the transmitting apparatus requests the receiving apparatus to search for a channel suitable for receiving data from the receiving apparatus (S20). The channel search request signal transmitted by the transmitting apparatus may include information on a channel to be searched (e.g., a channel identifier), a channel search time, and the like.

The receiving apparatus searches for a channel as a response to the channel search request (S21), and reports to the transmitting apparatus a suitable operational channel for data reception among the searched channels (S22). Specifically, the receiving apparatus can report the state of the channel (interference intensity, whether or not the corresponding channel is used by another device) together with the channel identification information (e.g., channel identifier) at the time of reporting the operable channel. Alternatively, the receiving apparatus may report only the most suitable channel to the operating channel selection criterion among the operable channels, or may sort and report the operable channels according to the operating channel selection criterion.

The transmitting apparatus selects (reselects) the operational channel among the operational channels based on the information reported from the receiving apparatus (S23), and provides the service (data transmission) through the selected channel (S24). Specifically, the transmitting apparatus transmits the operation channel selection result to the receiving apparatus, and may provide the data service. Alternatively, the transmitting apparatus may transmit the data (operation channel identification information + data) together with the identification information of the selected channel when providing the data service. Alternatively, if the operation channel selection result is the same as the previous operation channel, the transmitting apparatus may transmit the fact (the fact transfer procedure may be omitted) and provide the data service.

The channel search method illustrated in FIG. 33B (hereinafter referred to as a 'second channel search method') is a method in which a channel search requesting step (S20) of a transmitting apparatus is omitted in the first channel searching method. The second channel search method can be applied to a case where a receiving apparatus is provided with a data service from a transmitting apparatus, and a new operating channel is added or an operating channel is changed to a new channel.

The receiving apparatus searches for the channel (S30), and reports the channel search result to the transmitting apparatus (S31).

The transmitting apparatus selects (reselects) the operation channel based on the channel search result (S32), and provides the data service through the selected channel (S33).

The second channel search method is similar to or similar to the first channel search method except that the receiving apparatus reports the channel search result to the transmitting apparatus without request of the transmitting apparatus.

On the other hand, without the step S31 of the receiving apparatus reporting the channel search result to the transmitting apparatus, the transmitting apparatus may change the operating channel.

The channel search method illustrated in FIG. 33C (hereinafter referred to as a 'third channel search method') is a method in which a transmitting device transmits a corresponding fact ( (S40), and performs channel search (S42) in response to the request (S41).

The channel search response transmitted by the transmitting apparatus to the receiving apparatus may include acceptance, rejection, execution after a specific time, execution at a specific time, and the like. In addition, the channel search response may include a channel search time together with information (e.g., a channel identifier) about a channel to be searched, in the same or similar to the channel search request S20 of the first channel search method.

Subsequent procedures (S43, S44, and S45) may be performed in the same or similar manner as the first channel search method.

The channel searching method illustrated in FIG. 33D (hereinafter referred to as a 'fourth channel searching method') is a method in which the transmitting apparatus requests the receiving apparatus to perform channel searching (S50) After a response is made (S51), a channel search is performed according to a response (S52). Meanwhile, the step S51 of the receiving apparatus responding to the channel search request of the transmitting apparatus may be omitted.

The response to the channel search request may include acceptance, rejection, performance after a specific time, performance at a specific time, and the like, as in the third channel search method. The response to the channel search request may include a channel search time along with information (e.g., a channel identifier) about a channel to be searched, which is the same as or similar to the channel search request S20 of the first channel search method have. In this case, additional information needs to be received from the transmitting apparatus.

The subsequent procedures S53, S54, and S55 may be performed in the same or similar manner as the first channel search method.

The channel searching method illustrated in FIG. 33E (hereinafter referred to as a 'fifth channel searching method') is a method in which a transmitting apparatus searches for a channel, unlike the first through fourth channel searching methods.

Specifically, the transmitting apparatus selects (reselects) one of the channels searched through the channel search (S60) as an operation channel (S61), and performs data transmission to the receiving apparatus through the selected channel (S62).

The fifth channel search method is a method in which a transmitting apparatus re-searches an operation channel to reselect an operation channel, or includes another channel in an operable channel group, or searches for an operable channel among other channels and operates the corresponding operable channel This can be applied to a case where a channel is changed or a new operation channel is to be added.

On the other hand, when the transmitting apparatus is serviced through the newly changed operating channel, the fifth channel searching method may be performed in the same or similar manner as the data transmitting method of the first channel searching method.

The channel search method illustrated in FIG. 33F (hereinafter referred to as a 'sixth channel search method') includes a fifth channel search method in which a receiving apparatus requests a channel search (S70) and a transmitting apparatus transmits a channel search request To the receiving apparatus (S71). Meanwhile, the step S71 in which the transmitting apparatus responds to the channel search request may be omitted.

Unlike the fourth channel search method, the sixth channel search method can be applied to cases in which it is impossible or difficult to maintain the operable channel due to quality deterioration of a channel on which data is received, search of a device having a high priority, and the like. Specifically, the sixth channel search method can be applied to a case where the apparatus wants to change the operation channel to another channel due to the necessity of channel change, and the receiving apparatus requests the transmitting apparatus to perform channel search, To change the channel.

The response to the channel search request may include acceptance, rejection, performance after a specific time, performance at a specific time, and the like, as in the third channel search method. Also, the response to the channel search request includes the channel search time together with information (e.g., channel identifier) about the channel to be searched in the same or similar to the channel search request S20 of the first channel search method .

The subsequent procedures (S72, S73, S74) may be performed in the same or similar manner as the fifth channel search method.

2.1.2. Channel status evaluation ( assessment )

The channel state evaluation can be performed when the device desires to transmit data through a channel intended to be used.

34 is a diagram illustrating a data transmission procedure by channel state evaluation according to an embodiment of the present invention.

For example, when a channel state evaluation is required, it is necessary to determine whether another device or system uses the channel, whether the channel is in a suitable state for data transmission, and the like. Specifically, the transmitting apparatus can directly measure the channel state and determine whether the channel can be accessed based on the measurement result, or the transmitting apparatus can determine whether the channel can be accessed by the help of the receiving apparatus.

In the case where the transmitting apparatus measures the channel state, after the channel state is evaluated before data transmission, data can be continuously transmitted at a given time without further channel state evaluation, or data can be transmitted after evaluating the channel state at every data transmission have.

If the transmitting apparatus determines whether the channel can be accessed by the receiving apparatus, the receiving apparatus can evaluate the channel status at the request of the transmitting apparatus and report the channel status evaluation result to the transmitting apparatus. The transmitting apparatus can transmit data based on the reported channel state evaluation result. Alternatively, the receiving apparatus evaluates the channel state in advance without requesting (requesting) from the transmitting apparatus, reports (informs) the fact to the transmitting apparatus, and the transmitting apparatus omits the channel condition evaluation and transmits the data It is possible. In particular, the base station can evaluate the channel status for uplink data reception, thereby providing the terminal with a data transmission opportunity. Further, reception of the reception apparatus can be guaranteed, and hidden nodes, etc. can be detected by measuring the channel state of the reception apparatus without measuring the channel state by the transmission apparatus.

Specifically, the transmitting apparatus (transmitter) judges whether a channel state evaluation is necessary (S80), and directly evaluates the channel state or requests the receiving apparatus (receiver) to evaluate the channel state when a channel state evaluation is required (S81 ). Alternatively, the receiving apparatus may evaluate the channel state in advance and report the result to the transmitting apparatus without requesting the channel state evaluation of the transmitting apparatus.

The transmitting apparatus determines whether the channel is accessible based on the channel state evaluation result (S82). If the channel access is possible, the transmitting apparatus transmits the data through the channel (S83).

The transmitting apparatus determines whether channel state evaluation for additional data transmission is necessary (S84). The transmitting apparatus continuously transmits data at a given time when channel state evaluation for additional data transmission is not required. The transmission apparatus repeats the above-described steps (S80 to S83) when channel state evaluation for additional data transmission is required.

2.1.3. Channel operation

In the case where the apparatus selects an operation channel through the above-described channel search and performs data service through the selected channel, the following channel operation is required. Specifically, the apparatus needs to check whether the selected operating channel is continuously operable. In addition, the device needs to change the operational channel to a new operable channel and service over the changed channel. Also, the device needs to delete the channel if no more operational channels are present or are not needed.

2.1.3.1. Ensure continuous availability

The continuous operation availability check process is a process for determining whether the corresponding channel can be continuously operated as an operation channel when data transmission is performed between the transmitting apparatus and the receiving apparatus through the channel. The continuous operation availability checking process can be performed through a process of checking (searching) an operating channel during the above-described channel searching process. The continuous operation availability checking process can be performed by a transmitting apparatus or a receiving apparatus. In this case, the device may suspend the data transmission during the verification (search) of the operating channel, for a more precise search.

2.1.3.2. Change and delete operating channels

When a device (or a system) having a priority to use the operation channel being used for data service tries to use the corresponding channel, or when a lot of interference occurs in the operation channel, the device changes the operation channel to another channel do. In addition, when the apparatus does not need any further operation channel or desires to terminate the service through the corresponding operation channel, the apparatus deletes (cancels) the corresponding channel. Specifically, in order to change or delete the operation channel, the apparatus can perform the following process.

The apparatus searches for a third channel during service through the operational channel, determines whether the searched channel is a usable channel, and stores the searched channel as an operable channel when the searched channel is an operable channel have. This allows the device to be prepared for operational channel changes.

Or device, When a device (or system) that can use the operation channel preferentially can be discovered, the operation channel can be changed to a suitable one among the operable channels stored (e.g., the least interference channel, idle channel, etc.). Specifically, when a channel is changed, the device transmits a corresponding fact (channel change) to the partner device after data transmission or reception, and then changes the channel (or reuses the carrier change process of the carrier aggregation operation) When the channel change is completed, the service is performed through the changed channel. Alternatively, the apparatus may cancel the channel by deleting and creating (adding) a channel (or a carrier deletion and creation (addition) process of carrier aggregation, a carrier deactivation and activation process of carrier aggregation, etc.) It is possible to provide the data service through the operation channel except for the channel that has been used.

Or the device may delete the current operational channel if the service is not possible or unnecessary. Specifically, the device may delete the current operational channel through the channel deletion process (or reuse of the carrier deletion process or deactivation process of the carrier aggregation).

On the other hand, as illustrated in FIG. 35, there is a need for a channel management method for a case where the transmission area of the transmission device and the reception area of the reception device are different. 35 shows an example in which the transmitting apparatus 100T has the transmitting area CV1, the receiving apparatus 101S has the receiving area CV2, and the transmitting apparatus 102T has the transmitting area CV3 Respectively.

The transmitting apparatus 100T and the transmitting apparatus 102T transmit data through the same channel (e.g., # CH1), the transmitting apparatus 100T transmits data to the receiving apparatus 101S, and the transmitting apparatus 102T It is assumed that data is transmitted to the receiving apparatus 103S. The receiving apparatus 101S can receive signals from the transmitting apparatus 100T and the transmitting apparatus 102T.

The transmitting apparatus 100T transmits data to the receiving apparatus 101S through the channel #CH1 searched for by the above-described channel searching and the transmitting apparatus 102T also transmits data to the channel #CH1 searched for by the channel searching, Lt; / RTI > to the receiving device 103S.

When the receiving apparatus 101S simultaneously receives a signal from the transmitting apparatus 100T and the transmitting apparatus 102T, interference may occur due to the received signal.

In this situation, the receiving apparatus 101S confirms that the transmitting apparatus 102T is using the same channel (#CH1) as the transmitting apparatus 100T through the channel search, and transmits the fact to the transmitting apparatus 100T. . Thus, the receiving apparatus 101S can perform a service with the transmitting apparatus 100T by changing the channel for the service with the transmitting apparatus 100T to a new channel (e.g., # CH2). Thereafter, each of the transmitting apparatus 100T and the transmitting apparatus 102T can provide data services to the receiving apparatus 101S and the receiving apparatus 103S using the channel (#CH2) and the channel (#CH1) have. Through this, the interference can be reduced.

Alternatively, even when the receiving apparatus 101S notifies the transmitting apparatus 100T of the channel #CH1 already at the time of starting the service or changing the channel between the transmitting apparatus 100T and the receiving apparatus 101S (when the operating channel is selected or reselected) It may convey the fact that it is being used by another device (or other service). Accordingly, the transmitting apparatus 100T and the receiving apparatus 101S may not judge the channel #CH1 as the operable channel. Alternatively, the transmitting apparatus 100T and the receiving apparatus 101S may set the operable channel priority for the channel (#CH1) to a low level to assist in selecting (re-selecting) the operating channel.

2.2. Channel access / data transmission operation for periodic data transmission

The embodiment of the present invention can be applied not only to DRS having periodicity but also to transmission of all data transmitted by timing or period such as feedback signal, uplink data, retransmission signal, signal based on periodic allocation, and the like. Hereinafter, for convenience of description, embodiments of the present invention will be described by taking DRS transmission as an example. On the other hand, in transmission of downlink data (e.g., DRS), the transmitting apparatus is a base station and the receiving apparatus is a terminal. In the transmission of uplink data, the transmitting apparatus is a terminal and the receiving apparatus is a base station. In the transmission of direct link data, the transmitting apparatus and the receiving apparatus are terminals.

2.2.1. Radio resource access and occupation for transmission of periodic data

2.2.1.1. How to adjust the transmission time of data with periodicity

36 is a diagram illustrating a method of transmitting periodic data by changing a data transmission time according to an embodiment of the present invention. Specifically, as illustrated in FIG. 36, the base stations LL4, LL5, and LL6 can change the transmission time of the periodically transmitted data (hereinafter referred to as 'periodic data') to guarantee data transmission. If the transmission time of the periodicity data is changed, the CCA point performed immediately before transmission of the periodicity data is also changed.

As illustrated in FIG. 36, the base stations LL4 to LL6 change settings for the DMTC cycle, the DMTC offset, and the DMTC allocation period of the DRS, which is the periodic data, so that the time for performing the CCA is set not to overlap with other base stations . Specifically, the DMTC offsets off1, off2, off3 of the base stations LL4 to LL6 can be adjusted so that the DRS transmission times of the base stations LL1 to LL3 do not overlap each other. As illustrated in FIG. 36, since the DRS transmission times of the base stations LL4 to LL6 are adjusted so as not to overlap with each other, the CCA points of the base stations LL4 to LL6 performed immediately before the DRS transmission time are not overlapped with each other.

The base station LL4 performs the CCA for the channel of the license-exempt band during the T _CCA before the DRS transmission point determined by the DMTC offset (off1). Since the base station LL4 determines that the state of the corresponding channel is idle through the CCA, the base station LL4 transmits the DRS at the scheduled DRS transmission time within the DMTC period.

The base station LL5 performs the CCA for the channel of the license-exempt band during T _CCA before the DRS transmission point determined by the DMTC offset (off2). Since the base station LL5 determines that the state of the corresponding channel is idle through the CCA, the base station LL5 transmits the DRS at the scheduled DRS transmission time within the DMTC period.

The base station LL6 performs the CCA for the channel of the license-exempt band during the T _CCA before the DRS transmission point determined by the DMTC offset (off3). Since the base station LL6 determines that the state of the corresponding channel is idle through the CCA, it transmits the DRS at the scheduled DRS transmission time in the DMTC period. That is, all of the base stations LL4 to LL6 can guarantee their periodic DRS transmission.

Meanwhile, it is found that the process of adjusting the transmission time of the DRS is performed when the DMTC cycle, the DMTC offset, and the DMTC allocation period of the DRS are initially set, or the DRS transmission points of the base stations LL4 to LL6 overlap each other . ≪ / RTI >

Unlike the method illustrated in FIG. 36, the base station does not change (maintain) the DMTC cycle, the DMTC offset, and the DMTC allocation period of the DRS, and continues to perform the CCA until the channel is available to transmit the DRS have. For example, assuming the situation illustrated in FIG. 2, the corresponding method will be described. The base station LL3 performs the CCA for the channel of the license-exempt band before the DRS transmission time determined by the DMTC offset within the first DMTC cycle. Since the corresponding channel is used by the base station LL1, the base station LL3 determines that the state of the corresponding channel is busy or in use or occupied. In this case, the base station LL3 ignores the DMTC offset and continues the CCA until it can use (occupy) the channel. When the DRS transmission of the base station LL1 is completed within the first DMTC period, the base station LL3 determines that the corresponding channel is idle, and transmits the DRS at the time when it is determined that the channel is in the valid state. As a result, since the base station LL3 transmits the DRS having the periodicity at a time other than the time determined by the DMTC offset, the UE can not determine that the DRS is transmitted at a time other than the scheduled transmission time. In this case, the UE may perform DRS reception (e.g., Blind decoding) while expecting DRS reception continuously until DRS reception. Or to reduce unnecessary reception or power consumption of the terminal, the base station LL3 may indicate to the terminal that the DRS has been transmitted after the CCA. Alternatively, the base station LL3 may set the reception time to the terminal in order to prevent continuous reception of the terminal, and perform an operation for receiving the DRS by allowing the terminal to expect reception of the DRS during the reception time from the scheduled DRS transmission time .

2.2.1.2. CCA  How to change the viewpoint

37 is a diagram illustrating a method of transmitting periodic data by changing a CCA time according to another embodiment of the present invention. Specifically, as illustrated in FIG. 37, if the device has performed a CCA for a channel in the license-exempt band to transmit periodic data (e.g., DRS) within a previous transmission period, but the channel is in use by another device If it is determined that the periodicity data can not be transmitted, the CCA is performed earlier than the previous period and the periodicity data is transmitted within the transmission period. The method illustrated in FIG. 37 is performed by the following steps 1, 2, and 3.

First, a device (e.g., a base station) performs a CCA for a license-exempt band and, if it is determined that the channel is occupied or busy, the CCA point for the next transmission period of periodic data (e.g., DRS) It is earlier than before (Step 1). Specifically, the apparatus obtains a first point in time that is earlier by T _k (= T _{k -1} + T _m ) from the point of time of periodic data transmission, and obtains a second point in time from the first point of time, Start CCA execution at the point of time. Here, T _m is a constant unit, and is a minimum unit in which the special signal of step 2 is transmitted. The sum of the transmission time of the periodic data (transmission period), and T _k is, not to exceed the maximum channel occupation time (maximum channel occupancy time) to be presented by the frequency defined, T _k Is set. If, in the case where the sum of the transmission time T _k and the periodicity of the data exceeds the maximum channel occupation time, the apparatus sets as T _k = T _{k -1.}

If the device fails to occupy the channel even within the next transmission period of the periodicity data, it repeats step 1.

On the other hand, when the apparatus determines that the channel is in the usable state (idle state) as a result of performing the CCA, step 2 is performed.

The device occupies an idle channel and transmits periodic data (e.g., DRS) over the channel (step 2). Specifically, in order to occupy not only the transmission period of the periodic data but also the period (T _k ) from the CCA completion time to the transmission time point of the periodic data until the transmission time point of the periodicity data, Signal can be transmitted. By transmitting a special signal, the device can prevent other devices from occupying that channel for a period of T _k .

If the device has successfully transmitted the periodicity data, it resets T _k = 0 (step 3). That is, the device resets the CCA time for the next transmission period of the periodic data to a time point that is earlier by the CCA duration from the transmission time of the periodic data.

The above-described steps 1, 2, and 3 will be described in detail with reference to FIG. Among the base stations LL4, LL5 and LL6 illustrated in FIG. 37, the base station LL6 transmits a CCA (common CCA + extended CCA) for the channel before the DRS transmission time determined by the DMTC offset, . The base station LL6 determines that the corresponding channel is busy because the corresponding channel is used by the base station LL4 and fails to transmit the DRS at the scheduled DRS transmission time. In this case, the base station (LL6) CCA is more time for a second transmission period the DMTC CCA point DMTC first transmission period for T _m . That is, the base station LL6 performs the _CCA for the second DMTC transmission period at a time point advanced by T _k (= 0 + T _m ) + T _CCA + T _{Ext - CCA} from the DRS transmission time determined by the DMTC offset. However, since the corresponding channel is used by the base station LL4, the base station LL6 determines that the corresponding channel is busy and can not transmit the DRS within the second DMTC period.

The base station (LL6) CCA is more time for a second transmission period the DMTC CCA point for a third transmission period T _m DMTC . That is, the base station LL6 performs the _CCA for the third DMTC transmission period at a time point advanced by T _k (= T _m + T _m ) + T _CCA + T _{Ext - CCA} from the DRS transmission time determined by the DMTC offset. CCA result, the base station (LL6) is T _k in order to determine that it is idle the channel, to prevent the channel occupation by other devices And transmits the DRS at the scheduled DRS transmission time.

The base station (LL6) hayeoteumeuro is successfully transmitted to the DRS, and sets the T _k for DMTC fourth transmission period to zero. That is, the base station (LL6) is _{T k (= 0) + T} CCA + T Ext DRS from the transmission time determined by the offset DMTC _- the accelerated time by _CCA, performs CCA for DMTC fourth transmission period.

On the other hand, the base station (LL4) are more CCA point for a third transmission period DMTC hayeoteumeuro not transmit the DRS due to the base station (LL6) within, the CCA point for the fourth transmission period DMTC DMTC third transmission period T _m . That is, the base station (LL4) is _k T (= T _m) + T + T _{Ext CCA} DRS from the transmission time determined by the offset DMTC _- the accelerated time by _CCA, performs CCA for DMTC fourth transmission period. On the other hand, T _m may be a value different depending on the base station (LL4 ~ LL6).

2.2.2. CCA  Data transmission according to change setting of time

38A, 38B, 38C, 38D and 38E illustrate a method of transmitting periodic data and acyclic data (general data having no periodicity) by changing the CCA time according to another embodiment of the present invention FIG.

When the device determines that the channel is idle as a result of the CCA and transmits data by occupying the channel, the sum of the transmission period (T _k ) of the special signal and the transmission period of the data is the time (Maximum channel occupancy time, T _MAX ). As a result, the transmission time (transmission period) of the periodicity data is limited to the change of the CCA time point.

On the other hand, when the apparatus simultaneously transmits the aperiodic data and the periodic data, an additional CCA for periodic data (e.g., DRS) is required but the CCA time is not sufficient, as illustrated in FIG. 38A, none. That is, when the base station desires to transmit acyclic data, it performs CCA for the channel of the license-exempt band and transmits acyclic data using the corresponding channel occupied through the CCA. However, in order to transmit the DRS at the scheduled DRS transmission time, the base station should perform the CCA additionally. However, because of the non-periodic data transmission, there is not enough time to perform the CCA for the DRS transmission. A method for solving such a problem will be described in detail with reference to Figs. 38B to 38E. Figures 38A, 38C, 38D and 38E show Figure 38A. Figure 38A, 38C, 38D and 38E show Figure 38A.

The method illustrated in FIG. 38B is a method in which the apparatus prematurely terminates the channel occupation for the previous acyclic data transmission in consideration of the CCA period for transmission of periodic data (e.g., DRS). As illustrated in (B) of FIG. 38B, when the base station is transmitting non-periodic data occupying the channel, considering the CCA period for DRS transmission in order to transmit DRS at the scheduled DRS transmission time, The transmission of the periodic data is terminated earlier than the scheduled time (end at PT1). Then, the base station performs the CCA for the DRS transmission and transmits the DRS at the DRS transmission time using the occupied channel through the CCA.

The method illustrated in FIGS. 38C and 38D is a method in which the apparatus simultaneously transmits channel data for periodic data and acyclic data, and transmits acyclic data and periodic data during a channel occupancy time (period) through one CCA . In the method illustrated in FIGS. 38C and 38D, the channel occupancy time (T _COT ) includes a DRS occasion period.

Specifically, in the method illustrated in FIG. 38C, the apparatus performs CCA (omitting CCA for transmission of periodic data) for transmission of acyclic data. For example, as illustrated in (B) Figure 38c, the base station performs the CCA for the transmission of non-periodic data, by using the occupied channel through the CCA, the non-periodic data during a channel occupation period (T _COT) And DRS. In this way, the base station can successfully transmit the DRS at the scheduled DRS transmission time.

In the method illustrated in Figure 38 (d), the device performs a CCA for transmission of periodic data (omitting the CCA for transmission of non-periodic data). For example, as illustrated in (B) of FIG. 38D, the base station performs the CCA for transmission of the periodic data and transmits the DRS for the channel occupancy time (T _COT ) first using the channel occupied through the CCA And then transmit non-periodic data. In this way, the base station can successfully transmit the DRS at the scheduled DRS transmission time.

The method illustrated in FIG. 38E is a method in which, when the apparatus needs to transmit periodicity data shortly after the time when it intends to transmit acyclic data, it transmits a CCA for transmission of acyclic data to a delay . For example, as illustrated in (B) of FIG. 38E, when the time interval between the time point PT2 at which the base station desires to transmit the aperiodic data and the scheduled DRS transmission time point PT3 is equal to or less than a predetermined value, And delays the CCA time for data transmission after the point in time at which the DRS transmission is completed (PT4). Then, the BS performs the CCA before the scheduled DRS transmission time (PT3), and transmits the DRS using the channel occupied through the CCA. Then, the BS performs the CCA for transmitting the non-periodic data after the completion of the DRS transmission (PT4), and transmits the non-periodic data using the channel occupied through the CCA. This allows the device to increase the opportunity to transmit periodic data and to ensure more reliable data transmission.

2.2.3. Data transfer with improved channel access

For transmission of periodic data (e.g., DRS), the transmitting device (e.g., base station) performs a CCA. As a result of the CCA, if the transmitting apparatus determines that the channel is in the usable state (idle state), the periodic data is transmitted at the point in time at which the periodic data should be transmitted. If the transmitting apparatus determines that the channel is occupied (busy or occupied) as a result of the CCA, it can transmit periodicity data by not performing periodic data transmission or performing CCA until the channel is available. When the transmitting apparatus performs the CCA until the channel is available, the periodic data is transmitted to a point other than the predetermined transmission point of the periodic data due to the added CCA. When the transmitting apparatus transmits the periodic data at a time other than the predetermined transmission time, the receiving apparatus (e.g., the terminal) can not determine that transmission of the periodic data is performed at a time other than the predetermined transmission time, (Eg, blind decoding) until the next data reception is expected. Or may indicate to the receiving device that the transmitting device has transmitted periodic data after the CCA, thereby causing the receiving device to reduce unnecessary reception or power consumption.

Meanwhile, when the transmitting apparatus fails to transmit the periodicity data due to the channel occupied by another apparatus as a result of the CCA, it is unnecessary to transmit the periodic data at a predetermined transmission time within the transmission period, And may attempt to transmit the periodic data by performing the CCA before the scheduled transmission time within the next transmission period. In this case as well, the transmitting apparatus determines whether to transmit periodic data according to the CCA result, as described above. If it is determined that the channel continues to be occupied, the transmitting apparatus can not transmit the periodicity data at the scheduled transmission time. In order to solve this problem, when a transmitting apparatus performs a CCA, channel accessibility for transmission of periodic data is higher than transmission of other data (e.g., non-periodic data) Access and occupancy. To improve channel accessibility for transmission of periodic data, a method of adjusting the transmission time point of the periodic data (2.1.1.) Or a method of changing the CCA time point (2.1.2.) May be used.

Alternatively, a method of reducing the CCA slot for CCA or a method of reducing the number of unit time (CCA unit time) for CCA is used to increase channel accessibility for periodic data transmission It is possible. Here, the CCA slot is a unit time in which the CCA is performed, and may be several tens of us or a predetermined time. The device selects a certain number q at the time of CCA execution within the range of the value that the number of CCA unit time can have (hereinafter, 'CCA unit time number range', for example, 0 to N-1) CCA slot time). Where q is the number of CCA slots. That is, the device can set the length of the CCA slot for transmission of the periodic data to have a value smaller than other data (e.g., non-periodic data). Alternatively, the apparatus may set the CCA unit time number range to a different value for each data, and set the CCA unit time number range for periodicity data to a value smaller than other data (e.g., non-periodic data). For example, the apparatus may set the CCA unit time number range for periodic data to 0 to N ₁ -1 and the CCA unit time number range for non-periodic data to 0 to N ₂ -1, where N ₁ ≤ N ₂ ).

If the device fails to transmit periodic data within a previous transmission period (e.g., determined that the channel is occupied during q * (CCA slot time), the CCA unit time number for periodic data in the next transmission period (Eg, (0 to N ₃ -1) -> (0 to N ₄ -1), N ₄ ≤ N ₃ ), CCA units for other data (eg, acyclic data) (Eg, (0 to N ₅ -1) -> (0 to N ₆ -1), where N ₅ ≤ N ₆ ). This allows the device to increase the probability of transmission of periodic data.

Alternatively, to increase channel accessibility for the transmission of periodic data, the device may adjust the periodicity of the periodic data. Specifically, the apparatus adjusts the transmission period of the periodic data so that the periodic data can be transmitted more frequently than the existing period (e.g., the transmission period value PE1) (e.g., transmission period value PE1 -> transmission period value PE2, PE1). Alternatively, if the device fails to transmit the periodic data previously, the transmission period of the periodic data may be reduced (eg, PE1-> PE2, where PE2 = PE1) at the next transmission, The periodicity data transmission period may be reset (e.g., PE2- > PE1), and the periodicity data may be transmitted in the reset transmission period PE1.

2.3. Licensee  Depending on band frequency operation Licensee  How to operate a cellular system in a band

A method of operating the cellular system in the license-exemption zone in accordance with the license-exempt band frequency operation regulation will be described in detail with reference to FIGS. 39A and 39B.

39A and 39B are views showing a frame structure for cellular operation at an unlicensed band frequency according to an embodiment of the present invention. Specifically, FIGS. 39A and 39B show a frame for applying the method of occupying and using the channel in the license-exempt band described above to the cellular system operating in the license-exempt band.

39A shows the FBE, and Fig. 39B shows the LBE. T _RSV is as channel reservation time for the reservation signal (or, the above-mentioned special signals the same as or similar to the signal, the above-described initial signal and the same or similar signal) indicates a transmission time, T _{RSV _ TOTAL} the channel occupation, T _idle + T _RSV or T _CCA + T _{Ext - CCA} + T _RSV . T _CCA1 is T _CCA + T _{Ext - CCA} .

Basically, the channel occupation time (T _COT ) for data transmission is set based on a unit (subframe) in which the cellular system allocates and uses resources to transmit data (for example, 1 ms in the case of LTE) . Specifically, the channel occupancy time (T _COT ) must be set to at least one or more subframe lengths (or TTIs) and set within the maximum channel occupancy time (T _MAX ) according to the license-exempt frequency operation regulations. T _COT is the data transmission time (T _TX ) + special signal transmission time (T _RSV ).

In particular, the channel reservation time (T _{RSV_TOTAL} ) for channel occupancy is set to at least one subframe length (1 ms or TTI length), and may be extended by a subframe length (or TTI length) have.

On the other hand, when the CCA termination time can not be precisely adjusted to the subframe time (boundary time point) due to the variable CCA length set for channel sharing with the device operated in the license-exempt band, The device may transmit a reservation signal (e.g., a signal the same as or similar to the above-mentioned special signal, or a signal the same or similar to the above-mentioned initial signal). Therefore, the device shall transmit data specifying the channel occupancy time (T _COT ) as T _COT = T _TX + T _RSV . T _COT does not exceed the maximum channel occupancy time (T _MAX ), and T _TX represents the time in which the data is transmitted (in units of subframes or in units of TTI). And, when the device occupies a channel for data transmission, T _RSV transmits a reserved signal (or a special signal) to prevent channel occupation by another device, which indicates the time when the reserved signal is transmitted.

2.4. Special Design for signals

The special signal for accessing and occupying the channel of the license-exempt band is used to prevent occupation of the channel by another device.

40 is a diagram illustrating a special signal for periodic data transmission according to an embodiment of the present invention.

Specifically, as illustrated in FIG. 40, the device transmits a special signal immediately after the CCA when it does not immediately transmit periodic data (e.g., DRS to transmit when the small cell is in the off state). For example, the base station transmits a special signal from the CCA completion point to the DRS transmission point determined by the DMTC offset. In FIG. 40, as in FIG. 1, a case where a DRS occasion period includes five subframes is exemplified.

In FIG. 40, it is assumed that a section in which a special signal is transmitted has one subframe length, but this is only an example. The interval in which the special signal is transmitted may not exist at all, or may exist in units of CCA, one symbol interval of LTE, or several symbol units.

If DRS transmission starts in the i-th subframe, the subframe immediately before DRS transmission corresponds to the subframe in which the special signal is transmitted and is set (recognized) as the (i-1) th subframe. The base station can transmit a signal (RS (reference signal), PSS, or SSS) corresponding to the (i-1) th subframe through the corresponding symbol and subcarrier. For example, the BS may transmit a CRS and a CSI-RS (channel state information-reference signal) in a (i-1) th subframe as a special signal.

On the other hand, the special signal is a signal necessary for the apparatus to transmit data in accordance with the subframe boundary after the CCA. However, as illustrated in FIG. 41, the apparatus can not transmit the RS, PSS, SSS, Symbol) need to prevent channel access by other devices. For example, in a period Er1 in which RS (eg, CRS, CSI-RS), PSS, SSS, etc. are not transmitted in the (i-1) Access needs to be stopped.

In order to do this, data such as a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), or a physical downlink shared channel (PDSCH) To prevent channel access by other devices. Specifically, even if the state of the small cell is off (that is, the state in which the small cell does not perform data transmission), the small cell transmits data such as the PDCCH, the EPDCCH, or the PDSCH in the region Er1, It is possible to prevent channel access by other devices.

Alternatively, in order to prevent channel access by another device in the interval Er1, the device can use the existing RS (CRS, CSI-RS, DM-RS (demodulated RS), PRS It can be used as a special signal. For example, the base station can transmit RS (CRS, CSI-RS, DM-RS, PRS, etc.) as a special signal in the section Er1 to prevent channel access by another device. A method of utilizing such RS as a special signal will be described in detail with reference to Figs. 42, 43, 44A, 44B, and 44C.

FIG. 42 is a diagram illustrating a method of utilizing RS as a special signal according to an embodiment of the present invention. FIG. Specifically, FIG. 42 shows a case where the apparatus constructs a special signal using CRS, DM-RS, and CSI-RS in one subframe. In this specification, one subframe includes a first time slot and a second time slot, and a first time slot and a second time slot are divided into seven OFDM symbols and a frequency axis 12 (0th to 11th) subcarriers are included. In the present specification, the OFDM symbol numbers in one subframe are described as 0 th to 13 th, OFDM symbols 0 to 6 are for the first time slot, and OFDM symbols 7 to 13 are for the second time slot will be. Particularly, OFDM symbols 7 to 13 mean OFDM symbols 0 to 6 of the second time slot.

FIG. 42A shows CRS, DM-RS, and CSI-RS configured in one PRB (physical resource block) pair belonging to a general subframe. As illustrated in Figure 42 (A), special signals are still required for some OFDM symbol intervals (e.g., OFDM symbols 2-3, 9-10).

The OFDM symbol for transmission of the DM-RS may be changed or the configuration of the CSI-RS may be changed so as to be included in an OFDM symbol interval requiring a special signal, as illustrated in (B) and (C) of FIG. For example, as illustrated in (B) of FIG. 42, the base station may transmit the DM-RS transmitted in OFDM symbols 5-6 in an OFDM symbol interval (for example, OFDM symbols 2-3) So that the OFDM symbol for the DM-RS can be changed or added. Also, as illustrated in (B) of FIG. 42, the base station may change the OFDM symbol for the CSI-RS such that the CSI-RS is transmitted in an OFDM symbol interval (e.g., OFDM symbols 9-10) Can be added. Similarly, as illustrated in (C) of FIG. 42, the base station transmits a CSI-RS such that CSI-RS is transmitted in an OFDM symbol interval (for example, OFDM symbols 2-3 and 9-10) Lt; RTI ID = 0.0 > OFDM < / RTI >

On the other hand, when the device transmits a PSS or an SSS, a special signal can be configured as illustrated in FIG. 43 so that the RS according to the embodiment of the present invention is not transmitted in the region where the PSS or the SSS is transmitted. 43 is a diagram illustrating a special signal for a subframe in which a synchronization signal PSS, SSS is transmitted, according to another embodiment of the present invention. Figures 43 (A) and 43 (B) show FDD, and Figures 43 (C) and (D) show TDD. As illustrated in (A) to (D) of FIG. 43, the base station transmits CSI-RS or DM-RS in an OFDM symbol interval (for example, OFDM symbols 2-3 and 9-10) So that the OFDM symbol for the CSI-RS or the DM-RS can be changed or added.

On the other hand, a method of constructing a special signal when a special signal is transmitted only in a partial area within one subframe due to the CCA (for example, before the DRS transmission time) will be described in detail with reference to FIGS. 44A, 44B, Explain.

44A, 44B, and 44C are diagrams illustrating a method of transmitting a special signal in a partial area of a subframe according to another embodiment of the present invention. Figures 44A, 44B and 44C show (B) and (C) of Figure 42 (B) and (C), respectively. 44A to 44C illustrate a case where an OFDM symbol of a channel occupied by the apparatus after the CCA (that is, a partial region or a partial subframe in which a special signal is transmitted in one subframe) is OFDM symbols 4 to 13.

(B) or (C-1) of the channel occupied by the apparatus after the CCA (e.g., OFDM symbols 4 to 13) of the channel, as illustrated in (B-1) C is mapped from the last OFDM symbol (OFDM symbol 13). For example, an area corresponding to OFDM symbols 4 to 13 illustrated in FIG. 44A (B) is arranged in an area corresponding to OFDM symbols 4 to 13 illustrated in FIG. 44A (B-1) do. Likewise, the areas corresponding to OFDM symbols 4 to 13 illustrated in (C) of FIG. 44A are arranged in the areas corresponding to OFDM symbols 4 to 13 illustrated in (C-1) of FIG. 44A.

(B) or (C) of FIG. 44B to an OFDM symbol (e.g., OFDM symbol 4-13) of a channel occupied after the CCA, as illustrated in (B-2) and ) Is mapped from the OFDM symbol 0 to the transmission format illustrated in FIG. For example, an area corresponding to OFDM symbols 0 to 9 illustrated in FIG. 44B is arranged in an area corresponding to OFDM symbols 4 to 13 illustrated in FIG. 44B (B-2) do. Likewise, the areas corresponding to OFDM symbols 0 to 9 illustrated in (C) in FIG. 44B are arranged in the areas corresponding to OFDM symbols 4 to 13 illustrated in (C-2) in FIG. 44B.

As illustrated in (B-3) and (C-3) in FIG. 44C, an OFDM symbol (e.g., OFDM symbol 4-13) of a channel occupied after the CCA, i.e., a partial sub- It is possible. Specifically, the transmission format illustrated in FIG. 44C (B) or (C) is mapped from the OFDM symbol 0 in the first time slot of the partial subframe, and the (B ) Or the transmission format illustrated in (C) can be configured from OFDM symbol 7. For example, the area corresponding to the OFDM symbols 0 to 2 (the first time slot) illustrated in FIG. 44 (B) corresponds to the OFDM symbols 4 to 6 illustrated in (B-3) And the area corresponding to OFDM symbols 7 to 13 (second time slot) illustrated in FIG. 44 (B) is arranged in the area corresponding to OFDM symbol 7 (B-3) Th > to 13 < th > Likewise, an area corresponding to OFDM symbols 0 to 2 (first time slot) illustrated in (C) in FIG. 44C corresponds to OFDM symbols 4 to 6 illustrated in (C-3) And the area corresponding to OFDM symbols 7 to 13 (second time slot) illustrated in (C) in FIG. 44C corresponds to the OFDM symbols 7 to 8 shown in (C-3) 13 < / RTI >

On the other hand, when the apparatus transmits general data other than DRS, the RS included in the PDSCH may be used as a special signal in the method of constructing the above-mentioned special signal.

45 is a diagram showing a configuration of a transmitting apparatus 300 according to an embodiment of the present invention.

The transmitting apparatus 300 includes a processor 310, a memory 320, and a radio frequency (RF)

Processor 310 may be configured as described above. Functions, and methods described in connection with a transmitting device in " a method for managing radio resource access ".

The memory 320 is coupled to the processor 310 and stores various information related to the operation of the processor 310. [

The RF converter 330 is connected to the processor 310 and transmits or receives a radio signal. And the transmitting device 300 may have a single antenna or multiple antennas.

46 is a diagram showing a configuration of a receiving apparatus 400 according to an embodiment of the present invention.

Specifically, the receiving apparatus 400 includes a processor 410, a memory 420, and an RF converter 430.

Processor 410 may be configured as described above. Functions, and methods described in connection with a receiving apparatus in a method for managing radio resource access.

The memory 420 is coupled to the processor 410 and stores various information related to the operation of the processor 410. [

RF converter 430 is coupled to processor 410 and transmits or receives radio signals. And the receiving device 400 may have a single antenna or multiple antennas.

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 (20)

CLAIMS What is claimed is: 1. A method for transmitting first data having a periodicity on a channel through a license-
Adjusting at least one of a transmission time point of the first data and a clear channel assessment (CCA) time point for the channel in order to occupy the channel;
Performing a CCA for the channel at the CCA time point to determine whether the channel can be occupied; And
Transmitting the first data through the channel at the time of transmission of the first data when the channel can be occupied
And a transmitter. The method according to claim 1,
Wherein the adjusting comprises:
Adjusting a transmission offset for a transmission time point of the first data so that a transmission time point of the first data does not overlap with a time point at which another device transmits data having periodicity through the channel
Transmitter transmission method. The method according to claim 1,
Wherein the determining step comprises:
Performing a CCA for the channel continuously until it can occupy the channel regardless of a transmission offset for a transmission time of the first data
Transmitter transmission method. The method of claim 3,
Wherein the transmitting comprises:
Transmitting the first data at a time point when the channel can occupy the time point other than the time point when the first data is to be transmitted; And
And notifying the receiver to receive the first data that the first data has been transmitted at a time other than the predetermined time
Transmitter transmission method. The method according to claim 1,
Wherein the adjusting comprises:
When the first data is not transmitted within a previous transmission period for the first data, the CCA time is set to a time point earlier by a predetermined value than the time of starting the CCA within the previous transmission period ≪ / RTI >
Transmitter transmission method. 6. The method of claim 5,
The step of setting the CCA time point comprises:
Wherein a sum of a first duration between a transmission time point of the first data and a CCA end point determined by a transmission offset for the first data and a second time period for transmission of the first data is Setting the CCA time point to a time point at which the CCA starts within the previous transmission period when the time limit exceeding the limit occupancy time is exceeded
Transmitter transmission method. 6. The method of claim 5,
Wherein the transmitting comprises:
A special signal for preventing occupation of the channel by another device is transmitted through the channel from the end of the CCA to the transmission of the first data when the CCA can occupy the channel Step
Transmitter transmission method. 8. The method of claim 7,
When the first data is successfully transmitted through the channel, the CCA is terminated before the transmission time of the first data determined by the transmission offset of the first data within the next transmission period for the first data So as to set the CCA point for the next transmission period
The method comprising the steps of: The method according to claim 1,
The transmitter is a base station,
The first data is a discovery signal (DRS)
Transmitter transmission method. The method according to claim 1,
Wherein the transmitter is a terminal,
The first data is an uplink signal transmitted to the base station
Transmitter transmission method. CLAIMS What is claimed is: 1. A method for transmitting first data having a periodicity and second data having an aperiodicity on a channel through a license-
A first CCA for transmission of the first data, a second CCA for transmission of the second data, and a second CCA for transmission of the second data, ; And
Transmitting the first data over the channel to a first point of time determined by a transmission offset of the first data when occupying the channel through at least one of the first CCA and the second CCA;
And a transmitter. 12. The method of claim 11,
Before the adjusting step,
Further comprising transmitting the second data over the channel when occupying the channel through the second CCA,
Wherein the adjusting comprises:
And terminating the transmission of the second data prematurely in order to secure a duration during which the first CCA is performed
Transmitter transmission method. 12. The method of claim 11,
Wherein the adjusting comprises:
And omitting the first CCA when occupying the channel through the second CCA,
Wherein the transmitting comprises:
And transmitting the first data and the second data using the channel occupied through the second CCA
Transmitter transmission method. 12. The method of claim 11,
Wherein the adjusting comprises:
And omitting the second CCA when occupying the channel through the first CCA,
Wherein the transmitting comprises:
And transmitting the second data after transmitting the first data using the channel occupied through the first CCA
Transmitter transmission method. 12. The method of claim 11,
Wherein the adjusting comprises:
And delaying the time point of the second CCA after a time point when the first data is transmitted when the time interval between the time point when the second data is to be transmitted and the time point between the first time point and the first time point is less than a predetermined value
Transmitter transmission method. CLAIMS What is claimed is: 1. A method for transmitting first data having a periodicity and second data having an aperiodicity on a channel through a license-
A first duration in which a clear channel assessment (CCA) for transmission of the first data is performed so as to increase the possibility of channel occupation for transmission of the first data, a CCA for transmission of the second data, Adjusting at least one of a first period, a second period, and a transmission period length of the first data;
Performing a CCA during the first period; And
Transmitting the first data using the channel when occupying the channel through the CCA
And a transmitter. 17. The method of claim 16,
Wherein the adjusting comprises:
Decreasing at least one of the number of CCA unit time and the length of the CCA unit time for the first period; And
Determining the first period by multiplying the number of CCA unit times by the length of the CCA unit time
Transmitter transmission method. 17. The method of claim 16,
Wherein the adjusting comprises:
The first range in which the number of CCA unit time for the first period can be set to be smaller than the second range which is the range of the CCA unit time for the second period step; And
Determining the first period by multiplying the number of CCA unit times selected within the first range by the length of the CCA unit time for the first period
Transmitter transmission method. 17. The method of claim 16,
Wherein the adjusting comprises:
If the first data can not be transmitted within a previous transmission period for the first data, a first range which is a range of values that the number of CCA unit time for the first period can have is reduced or maintained Increasing a second range that is a range of values that the number of CCA unit times for the second period may have;
Selecting a number of CCA unit times for the first period within the first range; And
Determining the first period by multiplying the number of selected CCA unit times by the length of the CCA unit time for the first period,
Transmitter transmission method. 17. The method of claim 16,
Wherein the adjusting comprises:
And reducing the transmission period length of the first data if the first data is not transmitted within a previous transmission period for the first data
Transmitter transmission method.

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