KR20170020239A - Operation method of communication node in network supporting licensed and unlicensed bands - Google Patents

Abstract

A method of operating a communication node in a network supporting licensed and unlicensed bands is disclosed. The method of operating UE includes a step of receiving a PDCCH including a DCI from a base station in the sub frame n-1 of a unlicensed band, a step of decoding DCI by using a common RNTI, and a step of decoding the number of the symbols of the sub frame of the unlicensed band based on the decoded DCI. Thus, the performance of a communication network can be improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of operating a communication node in a network supporting license and license-exempt bands,

The present invention relates to communication technologies supporting licensed and license-exempt bands, and more particularly to a method of operating a communication node supporting licensed assisted access (LAA).

With the development of information and communication technology, various wireless communication technologies are being developed. Wireless communication technologies are broadly classified into wireless communication technologies using a licensed band and wireless communication technologies using an unlicensed band (for example, an industrial scientific medical (ISM) band) . Since licenses are licensed exclusively to one operator, wireless communication technologies that use licensed bands can provide better reliability and better communication quality than wireless licensed technologies that use license-exempt bands.

(Long term evolution), LTE-A (advanced), etc. defined in the 3rd generation partnership project (3GPP) standard, and LTE (or LTE-A, etc.) Each base station and user equipment (UE) can transmit and receive signals through the license band. A typical wireless communication technology using a license-exempt band is a wireless local area network (WLAN) defined by the IEEE 802.11 standard. Each of the access points and stations supporting the WLAN has a signal through a license- It can transmit and receive.

On the other hand, mobile traffic has been exploding in recent years, and it is necessary to secure an additional license band to process such mobile traffic through the license band. However, astronomical costs may be incurred in order to secure additional license bands, as licensed bands are finite, and usually licensed bands can be secured through auctions in the frequency bands between operators. In order to solve this problem, a scheme of providing LTE (or LTE-A, etc.) services through the license-exempt band can be considered.

When LTE (or LTE-A, etc.) services are provided through the license-exempt band, unnecessary information can be transmitted to the communication nodes that do not configure the license-exempt band cell. Also, due to the characteristics of the license-exempt band (e.g., opportunistic channel access, maximum transmission period (or maximum channel occupancy time limit), etc.), the subframe structure, scheduling method, May not be used.

Meanwhile, the technology as the background of the invention is intended to enhance understanding of the background of the invention, and may include contents that are not known to the person of ordinary skill in the art.

In order to solve the above problems, an object of the present invention is to provide a method for transmitting control information using a radio network temporary identifier (RNTI) for a license-exempt band.

According to another aspect of the present invention, there is provided a method of operating a UE in a communication network, the method comprising: receiving a PDCCH including a DCI in a subframe n-1 of a license-exempt band from a base station; Decoding the DCI, and verifying the number of symbols of the subframe n of the license-exempt band based on the decoded DCI.

Herein, the common RNTI may be obtained from the base station through RRC signaling.

Here, the CRC of the DCI may be scrambled based on the common RNTI.

Here, the sub-frame n-1 may have a length of 1 ms, and the sub-frame n may be a partial sub-frame having a length of less than 1 ms.

Here, when consecutive subframes are received from the base station, the subframe n may be a start frame among the consecutive subframes.

Here, when consecutive subframes are received from the base station, the subframe n may be an ending subframe among the consecutive subframes.

Here, the UE may further include checking whether the subframe n is a partial subframe having a length of less than 1 ms based on the decoded DCI.

According to another aspect of the present invention, there is provided a method of operating a base station in a communication network, the method including generating a DCI including information indicating a number of symbols of a sub-frame n of a license-exempted band, Performing scrambling for the CRC of the DCI, and transmitting the PDCCH including the scrambled DCI to the UE through the subframe n-1 of the license-exempt band.

Herein, the common RNTI may be transmitted to the UE through RRC signaling.

Here, the sub-frame n-1 may have a length of 1 ms, and the sub-frame n may be a partial sub-frame having a length of less than 1 ms.

Here, when consecutive subframes are transmitted to the UE, the subframe n may be a start frame among the consecutive subframes.

Here, when consecutive subframes are transmitted to the UE, the subframe n may be an ending subframe among the consecutive subframes.

Here, the DCI may further include information indicating that the subframe n is a partial subframe having a length of less than 1 ms.

According to another aspect of the present invention, a UE supporting a license-exempt band includes a processor and a memory in which at least one command executed by the processor is stored, From the base station, the PDCCH including the DCI in sub-frame n-1 of sub-frame n-1, decodes the DCI using the common RNTI, and checks the number of symbols of the sub-frame n of the license-exempt band based on the decoded DCI do.

Herein, the common RNTI may be obtained from the base station through RRC signaling.

Here, the CRC of the DCI may be scrambled based on the common RNTI.

Here, the sub-frame n-1 may have a length of 1 ms, and the sub-frame n may be a partial sub-frame having a length of less than 1 ms.

Here, when consecutive subframes are received from the base station, the subframe n may be a start frame among the consecutive subframes.

Here, when consecutive subframes are received from the base station, the subframe n may be an ending subframe among the consecutive subframes.

Here, the at least one command may be further executed to determine whether the subframe n is a partial subframe having a length of less than 1 ms based on the decoded DCI.

According to the present invention, an RNTI for a license-exempt band can be defined. In addition, based on the RNTI for the license-exempt band, subframe structure information (e.g., partial subframe-related information), scheduling information, activation request information of the license-exempt band cell, deactivation request information of the license- . In addition, the UE can obtain only necessary information using the RNTI for the license-exempt band. Thus, the license-exempted band cell can be efficiently operated and the performance of the communication network can be improved.

1 is a conceptual diagram showing a first embodiment of a wireless communication network.
2 is a conceptual diagram showing a second embodiment of a wireless communication network.
3 is a conceptual diagram showing a third embodiment of a wireless communication network.
4 is a conceptual diagram showing a fourth embodiment of a wireless communication network.
5 is a block diagram showing an embodiment of a communication node constituting a wireless communication network.
6 is a conceptual diagram showing an embodiment of a type 1 frame.
7 is a conceptual diagram showing an embodiment of a Type 2 frame.
8 is a conceptual diagram showing one embodiment of a resource grid of slots included in a subframe.
Figure 9 is a timing diagram illustrating one embodiment of a license-exempt band burst.
10 is a flow chart illustrating one embodiment of an RRC signaling method for "UE-specific U-RNTI ".
11 is a flowchart showing a method of transmitting and receiving common control information of a license-exempt band cell.
12 is a timing diagram showing a first embodiment of a method of activating a license-exempt band cell.
13 is a timing diagram showing a second embodiment of a method of activating a license-exempt band cell.
14 is a timing diagram showing a third embodiment of a method of activating a license-exempt band cell.
15 is a timing diagram showing a fourth embodiment of a method of activating a license-exempt band cell.
16 is a timing diagram showing a fifth embodiment of a method of activating a license-exempt band cell.
17 is a timing diagram showing a sixth embodiment of a method of activating a license-exempt band cell.
18 is a timing diagram showing a seventh embodiment of a method of activating a license-exempt band cell.
19 is a timing diagram showing an eighth embodiment of a method for activating a license-exempt band cell.
20 is a timing diagram showing a ninth embodiment of a method of activating a license-exempt band cell.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

In the following, a wireless communication network to which embodiments according to the present invention are applied will be described. The wireless communication network to which the embodiments according to the present invention are applied is not limited to the following description, and the embodiments according to the present invention can be applied to various wireless communication networks.

1 is a conceptual diagram showing a first embodiment of a wireless communication network.

Referring to FIG. 1, a first base station 110 may be coupled to a base station (not shown), such as cellular communication (e.g., long term evolution (LTE) licensed assisted access). The first base station 110 may be a multiple input multiple output (MIMO), a single user (MIMO), a multiuser (MU), a massive MIMO, Carrier aggregation (CA), and the like. The first base station may operate in a licensed band F1 and form a macro cell. The first base station 110 may be coupled to another base station (e.g., the second base station 120, the third base station 130, etc.) via an ideal backhaul or a non-idle backhaul.

The second base station 120 may be located within the coverage of the first base station 110. The second base station 120 may operate in an unlicensed band F3 and may form a small cell. The third base station 130 may be located within the coverage of the first base station 110. The third base station 130 may operate in the license-exempt band F3 and may form a small cell. Each of the second base station 120 and the third base station 130 may support a wireless local area network (WLAN) defined in the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. Each of the user equipment (not shown) connected to the first base station 110 and the first base station 110 transmits and receives signals through a carrier aggregation CA between the license band F1 and the license- can do.

2 is a conceptual diagram showing a second embodiment of a wireless communication network.

Referring to FIG. 2, each of the first base station 210 and the second base station 220 may support cellular communication (e.g., LTE, LTE-A, LAA, etc. defined in the 3GPP standard). Each of the first base station 210 and the second base station 220 may support MIMO (e.g. SU-MIMO, MU-MIMO, large-scale MIMO, etc.), CoMP, carrier aggregation (CA) Each of the first base station 210 and the second base station 220 may operate in the license band F1 and form a small cell. Each of the first base station 210 and the second base station 220 may be located within the coverage of the base station forming the macrocell. The first base station 210 may be connected to the third base station 230 via an idle backhaul or a non-idle backhaul. The second base station 220 may be coupled to the fourth base station 240 via an idle backhaul or a non-idle backhaul.

The third base station 230 may be located within the coverage of the first base station 210. The third base station 230 may operate in the license-exempt band F3 and may form a small cell. The fourth base station 240 may be located within the coverage of the second base station 220. The fourth base station 240 may operate in the license-exempt band F3 and form a small cell. Each of the third base station 230 and the fourth base station 240 may support a WLAN defined by the IEEE 802.11 standard. Each of the UEs connected to the first base station 210 and the first base station 210 and the UEs connected to the second base station 220 and the second base station 220 are connected to a carrier between the license band F1 and the license- Signals can be sent and received via Aggregation (CA).

3 is a conceptual diagram showing a third embodiment of a wireless communication network.

3, each of the first base station 310, the second base station 320, and the third base station 330 may be configured to perform cellular communication (e.g., LTE, LTE-A, LAA, etc. defined in 3GPP standards) . Each of the first base station 310, the second base station 320 and the third base station 330 may be a mobile station such as MIMO (e.g. SU-MIMO, MU-MIMO, large-scale MIMO etc.), CoMP, carrier aggregation . The first base station 310 may operate in the license band F1 and may form macro cells. The first base station 310 may be coupled to another base station (e.g., the second base station 320, the third base station 330, etc.) through an idle backhaul or a non-idle backhaul. The second base station 320 may be located within the coverage of the first base station 310. The second base station 320 may operate in the license band F1 and form a small cell. The third base station 330 may be located within the coverage of the first base station 310. The third base station 330 may operate in the license band F1 and form a small cell.

The second base station 320 may be coupled to the fourth base station 340 via an idle backhaul or a non-idle backhaul. The fourth base station 340 may be located within the coverage of the second base station 320. The fourth base station 340 can operate in the license-exempt band F3 and form a small cell. The third base station 330 may be connected to the fifth base station 350 via an idle backhaul or a non-idle backhaul. The fifth base station 350 may be located within the coverage of the third base station 330. The fifth base station 350 may operate in the license-exempt band F3 and may form a small cell. Each of the fourth base station 340 and the fifth base station 350 may support the WLAN defined in the IEEE 802.11 standard.

(Not shown) connected to the first base station 310, a UE (not shown) connected to the first base station 310, a second base station 320, a UE (not shown) connected to the second base station 320, And the UEs (not shown) connected to the third base station 330 can transmit and receive signals through the carrier aggregation CA between the license band F1 and the license-exempt band F3.

4 is a conceptual diagram showing a fourth embodiment of a wireless communication network.

4, each of the first base station 410, the second base station 420, and the third base station 430 includes a cellular communication (e.g., LTE, LTE-A, LAA, etc. defined in the 3GPP standard) . Each of the first base station 410, the second base station 420 and the third base station 430 may be a mobile station such as MIMO (e.g. SU-MIMO, MU-MIMO, large-scale MIMO etc.), CoMP, carrier aggregation . The first base station 410 may operate in the license band F1 and may form macro cells. The first base station 410 may be coupled to another base station (e.g., the second base station 420, the third base station 430, etc.) via an idle backhaul or a non-idle backhaul. The second base station 420 may be located within the coverage of the first base station 410. The second base station 420 may operate in the license band F2 and may form a small cell. The third base station 430 may be located within the coverage of the first base station 410. The third base station 430 may operate in the license band F2 and may form a small cell. Each of the second base station 420 and the third base station 430 may operate in a license band F2 different from the license band F1 in which the first base station 410 operates.

The second base station 420 may be coupled to the fourth base station 440 via an idle backhaul or a non-idle backhaul. The fourth base station 440 may be located within the coverage of the second base station 420. The fourth base station 440 may operate in the license-exempt band F3 and may form a small cell. The third base station 430 may be connected to the fifth base station 450 through an idle backhaul or a non-idle backhaul. The fifth base station 450 may be located within the coverage of the third base station 430. The fifth base station 450 may operate in the license-exempt band F3 and form a small cell. Each of the fourth base station 440 and the fifth base station 450 may support a WLAN defined in the IEEE 802.11 standard.

Each of the UEs (not shown) connected to the first base station 410 and the first base station 410 can transmit and receive signals through the carrier aggregation CA between the license band F1 and the license-exempt band F3. (Not shown) connected to the second base station 420, the UE (not shown) connected to the second base station 420, the third base station 430 and the third base station 430, And a carrier aggregation (CA) between the license-exempt zone (F3) and the license-exempt zone (F3).

A communication node (i.e., a base station, a UE, etc.) constituting the wireless communication network described above can transmit signals based on a listen before talk (LBT) procedure in an unlicensed band. That is, the communication node can determine the occupancy state of the license-exempt band by performing an energy detection operation. The communication node may transmit a signal when the license-exempt band is determined to be in an idle state. At this time, the communication node can transmit a signal when the license-exempt band is idle during a contention window according to a random backoff operation. On the other hand, the communication node may not transmit a signal when the license-exempt band is judged to be in a busy state.

Alternatively, the communication node may transmit a signal based on a carrier sensing adaptive transmission (CSAT) operation. That is, the communication node can transmit a signal based on a preset duty cycle. The communication node may transmit a signal if the current duty cycle is a duty cycle assigned for a communication node that supports cellular communication. On the other hand, the communication node may not transmit a signal if the current duty cycle is the duty cycle allocated for the communication node supporting communications other than cellular communication (e.g., WLAN, etc.). The duty cycle can be adaptively determined based on the number of communication nodes supporting the WLAN existing in the license-exempt band, the usage state of the license-exempt band, and the like.

The communication node may perform discontinuous transmission in the license-exempt band. For example, if the maximum transmission duration or the maximum channel occupancy time (max COT) is set in the license-exempt band, the communication node can not transmit within the maximum transmission period (or maximum channel occupancy time) Signal can be transmitted. If the communication node fails to transmit all of the signals within the current maximum transmission period (or maximum channel occupation time), the communication node can transmit the remaining signals in the next maximum transmission period (or maximum channel occupation time). In addition, the communication node may select a carrier with relatively small interference in the license-exempt band and may operate on the selected carrier. In addition, the communication node may adjust the transmission power to reduce interference to other communication nodes when transmitting signals in the license-exempt band.

Meanwhile, the communication node may be a communication protocol based on a code division multiple access (CDMA) communication protocol, a communication protocol based on a wideband CDMA (WCDMA), a communication protocol based on a time division multiple access (TDMA), a communication protocol based on a frequency division multiple access , An SC (single carrier) -FDMA communication protocol, an orthogonal frequency division multiplexing (OFDM) based communication protocol, and an orthogonal frequency division multiple access (OFDMA) based communication protocol.

Among the communication nodes, a base station includes a NodeB (NB), an evolved NodeB (eNB), a base transceiver station (BTS), a radio base station, a radio transceiver, an access point ; AP), an access node, and the like. Among the communication nodes, a UE may be a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a portable subscriber station, a mobile station ), A node, a device, and the like. The communication node may have the following structure.

5 is a block diagram showing an embodiment of a communication node constituting a wireless communication network.

Referring to FIG. 5, the communication node 500 may include at least one processor 510, a memory 520, and a transceiver 530 connected to a network to perform communication. In addition, the communication node 500 may further include an input interface device 540, an output interface device 550, a storage device 560, and the like. Each of the components included in the communication node 500 may be connected by a bus 570 to communicate with each other.

The processor 510 may execute a program command stored in at least one of the memory 520 and the storage device 560. The processor 510 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods in accordance with embodiments of the present invention are performed. Each of the memory 520 and the storage device 560 may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 520 may be comprised of at least one of read only memory (ROM) and random access memory (RAM).

Next, methods of operating the communication node in the wireless communication network will be described. Even if a method (e.g., transmission or reception of a signal) to be performed at the first communication node among the communication nodes is described, the corresponding second communication node is controlled by a method corresponding to the method performed at the first communication node For example, receiving or transmitting a signal). That is, when the operation of the UE is described, the corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, when the operation of the base station is described, the corresponding UE can perform an operation corresponding to the operation of the base station.

On the other hand, carrier aggregation can be applied between cells in the license-exempt band and cells in the license band. The configuration, add, modify, or release of a cell in the license-exempt zone may be accomplished by radio resource control (RRC) signaling (e.g., an RRConnectionReconfiguration message Reception procedure of the base station). The RRC message may be transmitted from the cell in the license band to the UE. The RRC message may include information necessary for operation and operation of the cell in the license-exempt band.

Signaling of the information used in the setup procedure of the initial license-exempt band cell may be performed in a discovery signal measurement timing configuration (DMTC) interval. For the addition of a license-exempt band cell, procedures and signaling for selecting a new license-exempt band cell for the UE may be performed. The operating environment of the license-exempt band may be different from the operating environment of the licensed band. In this case, procedures and signaling for managing the license-exempt band cell can be performed.

Unlike the cell in the license band, the period in which the signal can be continuously transmitted in the cell of the license-exempt band can be limited within the maximum transmission period. Further, when a signal is transmitted based on the LBT, a signal can be transmitted when transmission of another communication node is completed. Transmission of communication nodes supporting LTE (or LTE-A, etc.) may have aperiodic, discontinuous, opportunistic characteristics when LTE (or LTE-A, etc.) services are provided through the license-exempt band. Based on this feature, a signal transmitted continuously by a communication node supporting LTE (or LTE-A, etc.) for a certain time in the license-exempt band may be referred to as a " license-exempt band burst ".

In addition, a channel defined in the license band (for example, a physical control format indicator channel (PCFICH), a physical hybrid-ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH) channel, a physical multicast channel (PMCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), etc.) and a signal (for example, a synchronization signal, a reference signal, A contiguous set of subframes consisting of one or more combinations may be transmitted over the license-exempt band. In this case, the transmission of subframes may be referred to as "license-exempt band transmission ".

The frames used for transmission in the license-exempt band can be classified into a downlink license-exempt band burst frame, an uplink license-exempt band burst frame, and a downward / upward license-exclusion band burst frame. The DL-license-exempt band burst frame may include a sub-frame to which "license-exempt band transmission" is applied, and may further include a "license-exempt band signal ". Within the DL-license-exempt band burst frame, the "license-exempt band signal" may be located before the sub-frame to which the "license-exempt band transmission" applies. The "license-exempt band signal" is used to match the timing (or OFDM symbol timing) of the subframe to which the "license-exempt band transmission" is applied and the timing (or OFDM symbol timing) of the subframe in the license band Lt; / RTI > In addition, a "license-exempt band signal" may be used for automatic gain control (AGC), synchronization acquisition, channel estimation, etc. required for reception of data based on "license-exempt band transmission".

The subframe to which the "license-exempt band transmission" is applied can be set within the maximum transmission interval (or the maximum occupation interval). That is, the number of subframes to which the "license-exempt band transmission" is applied can be set based on the maximum transmission interval (or the maximum occupation interval). At this time, the number of subframes to which the " license-exempt band transmission "is applied can be set in consideration of the" license-exempt band signal ". In the license-exempt band, the maximum transmission interval (or maximum occupancy interval) may be known via RRC signaling. The UE can confirm the start time of the "license-exempt band burst" by detecting the PDCCH (or EPDCCH) or "license-exempt band signal ". The actual occupancy time by the subframe to which the "license-exempt band burst" or "license-exempt band transmission" is applied may be known via the "license-exempted band signal"

A "license-exempt band signal" may include information (or sequence) indicating the number (or time) of subframes used for "license-exempt band burst" or "license-exempt band transmission". Alternatively, information (or sequence) indicating the number (or time) of subframes used for "license-exempt band burst" or "license-exempt band transmission" may be transmitted via the PHICH.

In the license-exempt band, transmission of HARQ-related information on the uplink can be performed asynchronously differently from the license band. Accordingly, the RV and the HARQ process number can be transmitted on the PDCCH (or EPDCCH) instead of the PHICH. In this case, the PHICH may be used for the transmission of other information. For example, information (or sequence) indicating the number (or time) of subframes used for "license-exempt band burst" or "license-exempt band transmission" may be transmitted via the PHICH.

Meanwhile, a cellular communication network (e.g., LTE network) may support a frequency division duplex (FDD) scheme, a time division duplex (TDD) scheme, and the like. A frame based on the FDD scheme can be defined as a "type 1 frame ", and a frame based on the TDD scheme can be defined as a" type 2 frame ".

6 is a conceptual diagram showing an embodiment of a type 1 frame.

Referring to FIG. 6, a radio frame 600 may include 10 subframes, and a subframe may include 2 slots. Thus, the radio frame 600 may include 20 slots (e.g., slot # 0, slot # 1, slot # 2, slot # 3, ..., slot # 18, slot # 19). The length (T _f ) of the radio frame 600 may be 10 ms. The subframe length may be 1 ms. The slot length (T _slot ) may be 0.5 ms. Where T _s can be 1 / 30,720,000s.

The slot may be composed of a plurality of OFDM symbols in the time domain and may be composed of a plurality of resource blocks (RBs) in the frequency domain. The resource block may be composed of a plurality of subcarriers in the frequency domain. The number of OFDM symbols constituting the slot may be changed according to the configuration of the CP (cyclic prefix). A CP can be classified into a normal CP and an extended CP. If a regular CP is used, the slot may be composed of 7 OFDM symbols, in which case the subframe may be composed of 14 OFDM symbols. If an extended CP is used, the slot may be composed of six OFDM symbols, in which case the subframe may be composed of twelve OFDM symbols.

For example, when the subframe is composed of 14 OFDM symbols, the numbers of the OFDM symbols constituting the subframe are sequentially allocated to the OFDM symbol # 0, the OFDM symbol # 1, the OFDM symbol # 2, the OFDM symbol # OFDM symbol # 4, OFDM symbol # 4, OFDM symbol # 5, OFDM symbol # 6, OFDM symbol # 7, OFDM symbol # May be referred to as symbol # 13.

7 is a conceptual diagram showing an embodiment of a Type 2 frame.

Referring to FIG. 7, a radio frame 700 may include two half frames, and a half frame may include five subframes. Accordingly, the radio frame 700 may include 10 subframes. The length (T _f ) of the radio frame 700 may be 10 ms. The length of the half frame may be 5 ms. The subframe length may be 1 ms. Where T _s can be 1 / 30,720,000s.

The radio frame 700 may include a downlink subframe, an uplink subframe, and a special subframe. Each of the DL subframe and the UL subframe may include two slots. The slot length (T _slot ) may be 0.5 ms. Of the subframes included in the radio frame 700, each of the subframe # 1 and the subframe # 6 may be a special subframe. The special subframe may include a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).

The downlink pilot time slot can be regarded as a downlink interval and can be used for UE cell search, time and frequency synchronization acquisition, and so on. The guard interval can be used to solve the interference problem of the uplink data transmission caused by the downlink data reception delay. In addition, the guard interval may include a time required for switching from the downlink data reception operation to the uplink data transmission operation. The uplink pilot time slot may be used for uplink channel estimation, time and frequency synchronization acquisition, and the like.

The lengths of each of the downlink pilot time slot, the guard interval, and the uplink pilot time slot included in the special subframe can be variably adjusted as needed. In addition, the number and position of each of the downlink subframe, the uplink subframe, and the special subframe included in the radio frame 700 may be changed as needed.

8 is a conceptual diagram illustrating an embodiment of a resource grid of slots included in a subframe.

Referring to FIG. 8, a resource block of a slot included in a downlink subframe or an uplink subframe may be composed of 7 OFDM symbols in a time domain when a normal CP is used, and 12 subframes Carriers. In this case, a resource constituted by one OFDM symbol in the time domain and one subcarrier in the frequency domain may be referred to as a "resource element (RE) ".

In a downlink transmission of a cellular communication network (e.g., an LTE network), resource allocation for one UE can be performed on a resource block basis, and mapping for a reference signal, a synchronization signal, .

A control channel is allocated to three OFDM symbols (for example, OFDM symbols # 0 to # 2) or four OFDM symbols (for example, OFDM symbols # 0 to # 3) located in the front part in the first slot of the subframe Lt; / RTI > The control channel may include PDCCH, PCFICH, PHICH, and the like. A data channel (e.g., a PDSCH or the like) used for data transmission to the remaining areas (for example, OFDM symbol # 4 to OFDM symbol # 13) other than the area where the control channel is configured in the subframes can be basically configured , And an EPDCCH may be configured in some resource block (or resource element) among the remaining regions.

Information indicating the number of OFDM symbols used for the control channel may be transmitted via the PCFICH. PCFICH may be configured in OFDM symbol # 0 of the subframe. (E. G., A hybrid automatic repeat request (HARQ) response, etc.) to the uplink (e.g., PUSCH, etc.) transmission may be sent via the PHICH. Here, the HARQ response may include acknowledgment (ACK), negative ACK (NACK), discontinuous transmission (DTX), ANY, and the like.

The downlink control information (DCI) may be transmitted through at least one of a PDCCH and an EPDCCH. The DCI may include at least one of UE and resource allocation information and resource control information for a specific group. For example, the DCI may include downlink scheduling information, uplink scheduling information, an uplink transmission power control command, and the like. Here, the specific group may include at least one UE.

The DCI may have a different format depending on the type, number, and size (e.g., the number of bits constituting the information field) of the information field. DCI formats 0, 3, 3A, 4, etc. may be used for the uplink. DCI formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, etc. may be used for the downlink. Depending on the DCI format, the information contained in the DCI may vary. For example, a carrier indicator field (CIF), a resource block allocation, a modulation and coding scheme (MCS), a redundancy version (RV), a new data indicator (NDI), a transmit power control (TPC) Information such as a precoding matrix indicator (PMI) (or PMI confirmation), a hopping flag, a flag field, and the like may optionally be included in the DCI according to the DCI format. Therefore, the size of the control information may vary according to the DCI format. In addition, the same DCI format can be used for transmission of two or more types of control information. In this case, the control information can be distinguished by the flag field included in the DCI. The control information included in the DCI by DCI format may be as shown in Table 1 below.

The PDCCH may be assigned to a single or a plurality of consecutive aggregation of control channel elements (CCEs), and the EPDCCH may be allocated to a set of one or a plurality of consecutive ECCEs (enhanced CCEs). The CCE or ECCE can be a logical allocation unit and can be composed of a plurality of REGs (resource element groups). The size of the bits transmitted via the PDCCH (or EPDCCH) may be determined based on the number of CCEs (or ECCEs), the coding rate, and the like.

Figure 9 is a timing diagram illustrating one embodiment of a license-exempt band burst.

Referring to FIG. 9, the timing of a subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of a subframe (or slot, OFDM symbol, etc.) of the license-exempt band. In the licensed band the signal can be transmitted continuously. That is, burst transmissions in the licensed band can occur continuously.

On the other hand, burst transmissions in the license-exempt band can occur non-consecutively. For example, a license-exempt band burst may be generated in units of four subframes. Of the subframes constituting the license-exempt band burst, the starting subframe (i.e., the first subframe) may have a size smaller than 1 ms. A starting sub-frame having a size of less than 1 ms may be referred to as a "starting sub-frame ". In addition, of the subframes constituting the license-exempt band burst, the ending subframe (i.e., the last subframe) may have a size smaller than 1 ms. An ending sub-frame having a size of less than 1 ms may be referred to as an "ending sub-frame. &Quot; The sum of the length of the starting sub-frame and the length of the ending sub-frame may be set to 1 ms. For example, the starting subframe may be composed of OFDM symbols # 4 to # 6 of the first slot and OFDM symbol # 6 of the second slot. In this case, the ending subframe includes OFDM symbols # 0 to # 3 < / RTI >

The starting point of the license-exempt band burst (or the starting sub-frame) may be set within a set of preset OFDM symbol numbers. For example, the starting point of the license-exempt band burst may be set to OFDM symbol # 0 of the first slot in the subframe or OFDM symbol # 0 of the second slot. Alternatively, the starting point of the license-exempt band burst in the network based on the TDD scheme may be an OFDM symbol located after the "OFDM symbol # 0 + preset offset" of the first slot in the subframe. Here, the predetermined offset may be a time corresponding to "guard interval (GP) + uplink pilot time slot (UpPTS) ". For example, in a network based on the TDD scheme, the starting point of the license-exempt band burst may be the OFDM symbols # 0, # 2, # 3, # 5 of the first slot in the subframe or OFDM symbol # 1 of the second slot .

Alternatively, the start time of the license-exempt band burst may be set to the start time, end time, or transmission time of the PDCCH or a reference signal (e.g., cell specific reference signal (CRS), etc.) in the license band. For example, the starting point of the license-exempt band burst may be the OFDM symbol # 0 or # 4 of the first slot in the subframe. The starting point of the license-exempt band burst is not limited to the above-described contents, and may be set to any OFDM symbol in the subframe.

On the other hand, a cyclic redundancy check (CRC) for error detection may be attached to the control information transmitted through the PDCCH (or EPDCCH) based on the DCI format. The CRC is masked (e.g., scrambled) based on a radio network temporary identifier (RNTI) according to the communication node (e.g., UE, station, etc.) that will receive the PDCCH (or EPDCCH) . Alternatively, the CRC may be masked (e.g., scrambled) based on the RNTI for the purpose. The types of RNTIs and corresponding values are shown in Table 2 below.

The use of RNTI may be as shown in Table 3 below.

The license-exempt band-cell-related identifier may be referred to as an unlicensed cell (U-RNTI) and may be referred to differently depending on the information of the license-exempt band cell. The U-RNTI may be sent to the UE via RRC signaling.

)는 아래 수학식 1을 기초로 결정될 수 있다. UE는 PDCCH(또는, EPDCCH)를 획득하기 위해 후보 CCE(또는, ECCE)를 모니터링할 수 있다.The PDCCH (or EPDCCH) containing the CRC masked (e.g., scrambled) with the U-RNTI may be transmitted via a common search space or a UE-specific search space . The location of the PDCCH (or EPDCCH) in the common search space or the UE-specific search space is determined by the aggregation level of the CCE (or ECCE), the CCE (or ECCE) index calculated by the U- Or the like. The location of the candidate CCE (or ECCE) to be monitored in the common search space or the UE-specific search space

) Can be determined based on the following Equation (1). The UE may monitor the candidate CCE (or ECCE) to obtain a PDCCH (or EPDCCH).

L can indicate the aggregation level. For example, L may be 1, 2, 4, or 8. The aggregation level for the CCE (or ECCE) included in the PDCCH (or EPDCCH) transmitted in a partial sub-frame (for example, a sub-frame having a length of less than 1 ms) For example, 16, 32, etc.). _Yk in the common search space may be set to zero. Furthermore, Y _k may be determined based on an RNTI (e.g., U-RNTI in the license-exempt band). m 'may be a positive integer less than the total number M ^(L) -1) of candidate PDCCHs (or candidate EPDCCHs, candidate CCEs, candidate ECCEs) to be monitored in the common search space (or UE- . N _{CCE, k} may indicate the total number of CCEs (or ECCEs) included in subframe k.

Meanwhile, the U-RNTI may be set to a value for UE-specific, a common value for a base station, a common value for a license-exempt band cell, a preliminary value, and the like. A U-RNTI with a value for UE-specific may be referred to as a "UE-specific U-RNTI ". A U-RNTI with a common value for the base station may be referred to as a "base station common U-RNTI ". A U-RNTI having a common value for a license-exempt band cell may be referred to as a " license-exempt band cell common U-RNTI ". "Base station common U-RNTI" and "license-exempt band cell common U-RNTI" can be used for transmission of common control information.

The "UE-specific U-RNTI" may be transmitted via RRC signaling with information related to configuration, addition, etc. of the license-exempt band cell. The RRC signaling method for "UE-specific U-RNTI"

10 is a flow chart illustrating one embodiment of an RRC signaling method for "UE-specific U-RNTI ".

Referring to FIG. 10, the base station and the UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station may support carrier aggregation. The base station and the UE may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band.

The base station may generate an RRC message (e.g., an RRCConnectionReconfiguration message) that includes a "UE-specific U-RNTI" (or "base station common U-RNTI" S1000). The base station can transmit the RRC message (S1010). The RRC message may be transmitted in the license band or in the license-exempt band. The UE can receive the secondary RRC message from the base station and acquire a "UE-specific U-RNTI" (or "base station common U-RNTI", "license-exempt band cell common U-RNTI") from the received RRC message (S1020). When the RRC message is received, the UE may transmit a response message (e.g., RRCConnectionReconfigurationComplete message) to the base station in response to the RRC message (S1030).

On the other hand, the "base station common U-RNTI" can be used for transmission of configuration information and system information of the license-exempt band cell set by the base station. The configuration-related information and system information of the license-exempted band cell may be referred to as "UCell configuration / system information ". The "base station common U-RNTI" can be preset in the same or similar to the SI-RNTI. Alternatively, the "base station common U-RNTI" may be transmitted via RRC signaling. "License-exempt band-cell common U-RNTI" can be set for each license-exempt band cell. The "license-exempt band cell common U-RNTI" may be transmitted via RRC signaling. For example, in a procedure in which a license-exempt band cell is newly set as a secondary cell, an "license-exempt band cell common U-RNTI" may be included in an RRC message (e.g., an RRCConnectionReconfiguration message).

The U-RNTI may be used for the transmission of license-exempt band related information (e.g., configuration / addition / modification / release related information of the license-exempt band cell, system information, etc.) supported by the base station. The U-RNTI can also be used to transmit control information of different license-exempt band cells. The U-RNTI may also be used for the transmission of a dynamic activation or deactivation request message of the license-exempt band cell. Here, the U-RNTI may be set differently depending on the purpose of use, the PDCCH (or EPDCCH) reception target. For example, a U-RNTI may be established which is used for the transmission of an activation or deactivation message of a common license-exempt band cell. Alternatively, a U-RNTI may be set to be used for transmission of an activation or deactivation message of a UE-specific license-exempt band cell.

U-RNTI related information (e.g., U-RNTI value, period, etc.) used for transmission of UCell configuration / system information can be RRC signaled. The scheduling information for the UCell configuration / system information may be transmitted on the PDCCH (or EPDCCH) in the common search space in the licensed band cell (e.g., licensed band PCell or licensed band SCell). The UCell configuration / system information may be transmitted on the PDSCH indicated by the scheduling information. The CRC of the DCI including scheduling information, control information, etc. for UCell configuration / system information may be masked (e.g., scrambled) with U-RNTI. UCell configuration / system information can be transmitted periodically or aperiodically. When UCell configuration / system information is periodically transmitted, information indicating the transmission period can be transmitted via RRC signaling. In this case, the UE can acquire information indicating the transmission period through RRC signaling, receive the PDCCH (or EPDCCH) based on the transmission period, and transmit the PDCCH (or EPDCCH) using the U- To obtain UCell configuration / system information.

The UCell configuration / system information may include at least one of license-free bandwidth related information supported by the base station, operation / management related information of the license-exempt band cell, and UE requirements related to the license-exempt band cell. For example, the UCell configuration / system information includes channel information of the license-exempt band supported by the base station, maximum transmission power, channel access scheme (for example, channel access scheme based on LBT operation), maximum transmission period, Time, channel state measurement related information (e.g., measurement time and period of received signal strength indication (RSSI), RSSI histogram, etc.), multicast broadcast (MBSFN) (e.g., information indicating whether the starting sub-frame is a partial sub-frame, information indicating whether or not the starting sub-frame includes OFDM The number of symbols, the OFDM symbol number (or a set of OFDM symbol numbers) at which the starting sub-frame starts, and the like) and the end sub- (E.g., information indicating whether the ending subframe is a partial subframe, the number of OFDM symbols constituting the ending subframe, the OFDM symbol number at which the ending subframe ends (or a set of OFDM symbol numbers ), And the like). The UCell configuration / system information may be transmitted to the UE via the RRC message.

If the UCell configuration / system information includes the configuration information of the starting subframe included in the license-exempt band burst, the set of OFDM symbol numbers from which the starting subframe begins can be {3, 6} or {0, 3, 6} have. Here, OFDM symbol # 7 may be used instead of OFDM symbol # 6.

If the UCell configuration / system information includes the configuration information of the ending subframe included in the license-exempt band burst, the set of OFDM symbol numbers for which the ending subframe ends is {3, 9, 10, 11, 12, 10, 11, 12}, {3, 9, 10, 11, 12, 13} or {9, 10, 11, 12, 13}. When a Type 2 frame is used, a set of OFDM symbol numbers can be set according to the DwPTS configuration. Alternatively, a set of OFDM symbol numbers may be set regardless of the DwPTS configuration

On the other hand, a UE (for example, a UE that intends to configure a license-exempt band cell) can acquire configuration-related information of a license-exempt band cell by receiving UCell configuration / system information. The UE may configure the license-exempt band cell using configuration-related information of the license-exempt band cell. Here, since the UCell configuration / system information is transmitted based on the U-RNTI instead of the SI-RNTI, all the UEs need not perform the reception operation and the decoding operation of the PDSCH including the UCell configuration / system information. For example, a UE that does not configure a license-exempt band cell may not use a U-RNTI. Therefore, a UE that does not configure a license-exempt band cell can not decode a PDCCH (or EPDCCH) including scheduling information for UCell configuration / system information, and may not receive a PDSCH including UCell configuration / system information . On the other hand, a UE that wishes to construct a license-exempt band cell can receive a DCI including a CRC masked (e.g., scrambled) in a U-RNTI through a PDCCH (or EPDCCH) The scheduling information for the UCell configuration / system information can be obtained by performing descrambling on the DCI based on the UCell configuration / system information. A UE that wishes to configure a license-exempt band cell can receive UCell configuration / system information via the PDSCH indicated by the scheduling information. Here, the CRC of the PDSCH including the UCell configuration / system information may be masked (e.g., scrambled) based on the U-RNTI. In this case, the UE may obtain UCell configuration / system information by performing descrambling based on the U-RNTI.

Next, the use case of the "license-exempt band cell common U-RNTI" will be described. The "license-exempt band cell common U-RNTI" can be set for each license-exempt band cell. The "license-exempt band cell common U-RNTI" related information (e.g., U-RNTI value, period, etc.) can be transmitted via RRC signaling. For example, the "license-exempt band-cell common U-RNTI" related information can be transmitted through the RRCConnectionReconfiguration message. Alternatively, the "license-exempt band cell common U-RNTI" related information may be included in the UCell configuration / system information.

The "license-exempt band-cell common U-RNTI" can be used for transmission of control information for each license-exempt band cell in a license band cell or a license-exempt band cell. For example, a "license-exempt band cell common U-RNTI" set for a license-exempt band cell-A may be used for transmission of UCell configuration / system information for a license-exempt band cell-A. The CRC of the PDCCH (or EPDCCH) including the scheduling information for the UCell configuration / system information for the license-exempt band cell-A is masked based on the "license-exempt band cell common U-RNTI" set for the license- For example, scrambled). The CRC of the PDSCH including the UCell configuration / system information for the license-exempt band cell-A may be masked (e.g., scrambled) based on the "license-exempt band cell common U-RNTI" set for the license-exempt band cell-A . Thus, the UE can obtain UCell configuration / system information for the license-exempt band cell-A by performing descrambling based on the " license-exempt band cell common U-RNTI "set for the license-exempt band cell-A.

The license-exempt band-specific control information can be transmitted periodically or aperiodically. If control information for each license-exempt band cell is periodically transmitted, period information for control information for each license-exempt band cell can be transmitted through RRC signaling. Alternatively, a DRS (discovery reference signal) periodically transmitted in the license-exempt band may include control information for each license-exempt band cell. In this case, the control information for each license-exempt band can be periodically transmitted according to the period of the DRS. Also, the CRC of the PDCCH (or EPDCCH, PDSCH) in which the DRS is configured can be masked (e.g., scrambled) based on the " license-exempt band cell common U-RNTI ". Therefore, the UE can obtain control information for each license-exempt band by performing descrambling based on the " license-exempt band-cell common U-RNTI ".

The license-exclusion band-specific control information may include at least one of the license-exclusion band information supported by the base station, the operation / management-related information of the license-exempt band cell, and the UE requirements related to the license-exempt band cell. For example, the control information for each UCell license-based cell may include channel information of the license-exempt band supported by the base station, maximum transmission power, channel access scheme (for example, channel access scheme based on LBT operation) Occupancy time and channel state measurement related information (e.g., measurement time and period of received signal strength (e.g., RSSI), RSSI histogram, etc.).

On the other hand, a UE configuring a license-exempt band cell can obtain control information for each license-exempt band cell through PDCCH (or EPDCCH, PDSCH). For example, the UE can derive control information for each license-exempt band by performing descrambling on the PDCCH (or EPDCCH, PDSCH) based on the " license-exempt band cell common U-RNTI ". Therefore, only a UE (for example, a UE using a "license-exempt band cell common U-RNTI") constituting a license-exempt band cell can obtain control information for each license-exempt band cell.

Further, the "license-exempt band cell common U-RNTI" can be used for transmission of common control information of the license-exempt band cell. Alternatively, the "license-exempt band cell common U-RNTI" may be used to transmit the DCI over the PDCCH (or EPDCCH) in the common search space of the license-exempt band. Here, the DCI can be transmitted via common signaling. The "license-exempt band cell common U-RNTI" can be set identically in all cells of the license-exempt band. Alternatively, the "license-exempt band-cell common U-RNTI" may be set differently for each license-exempt band cell. If the "license-exempt band cell common U-RNTI" is differently set for each license-exempt band cell, the "license-exempt band cell common U-RNTI" may be transmitted to the UE via the RRC message.

If the SCell is configured in the license-exempt band, the DCI containing the common control information of the license-exempt band cell may be transmitted on the PDCCH (or EPDCCH) in the common search space of the license-exempt band SCell. Thus, the UE can receive the PDCCH (or EPDCCH) by performing monitoring on the common search space in the license-exempt band SCell. To reduce the number of blind detections for PDCCH (or EPDCCH) monitoring, a fixed aggregation level or a fixed DCI format may be used. For example, the aggregation level may be 4 or 8. The DCI format may be 1A or 1C. The common control information of the license-exempt band cell may include at least one of the following information.

- information indicating whether a subframe including common control information of a license-exempt band cell (hereinafter referred to as "current subframe") is a start subframe among license-released bandwidth bursts (for example, a set of consecutive subframes)

- information indicating whether the current subframe is an ending subframe among the license-exempt band bursts

- information indicating whether the current subframe is a partial subframe

- information indicating the number of OFDM symbols included in the current subframe

- information indicating an OFDM symbol number (or a set of OFDM symbol numbers) at which the current subframe starts

- Information indicating an OFDM symbol number (or a set of OFDM symbol numbers) at which the current subframe ends

- information indicating the CRS port (port) of the current subframe

- information indicating the number of OFDM symbols for which CRS is configured in the current subframe

- MBSFN related information in the current subframe

- information indicating the number of subframes consecutively arranged after the current subframe

- information indicating whether the current subframe is composed solely of DRS

- information indicating the transmit power of the reference signal (e.g., CRS, CSI (channel state information) -RS, etc.) in the current subframe or license-exempt band burst

- information indicating the transmit power offset of the reference signal (e.g., CRS, CSI-RS, etc.) in the current subframe or license-exempt band burst

- information indicating whether a subframe located after the current subframe (hereinafter referred to as "the next subframe") is a partial subframe

- information indicating the number of OFDM symbols included in the next subframe

- information indicating an OFDM symbol number (or a set of OFDM symbol numbers) at which the next subframe starts

- Information indicating an OFDM symbol number (or a set of OFDM symbol numbers) at which the next subframe ends

The method of transmitting and receiving common control information of the license-exempt band cell may be as follows.

11 is a flowchart showing a method of transmitting and receiving common control information of a license-exempt band cell.

Referring to FIG. 11, the base station and the UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station may support carrier aggregation. The base station and the UE may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band.

The base station can generate DCI including information indicating the number of OFDM symbols of subframe # (n-1) or subframe #n (S1100). In addition, the DCI may further include information indicating whether subframe # (n-1) or subframe #n is partial subframe. The subframe # (n-1) or the subframe #n may be a starting subframe among a plurality of subframes included in the license-exempt band burst. For example, if the subframe #n is the starting subframe among the plurality of subframes included in the license-exempt band burst, the subframe # (n-1) may be a subframe located before the license-exclusion band burst. In this case, the length of the sub-frame # (n-1) may be 1 ms, and the length of the sub-frame #n may be less than 1 ms. That is, the subframe #n may be a partial subframe. When subframe # (n-1) is a starting subframe among a plurality of subframes included in the license-exempt band burst, subframe #n is a subframe located after subframe # (n-1) . In this case, the length of sub-frame # (n-1) may be smaller than 1 ms, and the length of sub-frame # n may be 1 ms. That is, the subframe # (n-1) may be a partial subframe.

Alternatively, the subframe # (n-1) or the subframe #n may be the ending subframe among a plurality of subframes included in the license-exempt band burst. For example, when the subframe #n is the ending subframe among a plurality of subframes included in the license-exempt band burst, the subframe # (n-1) is a subframe located before the subframe #n among the license- have. In this case, the length of the sub-frame # (n-1) may be 1 ms, and the length of the sub-frame #n may be less than 1 ms. That is, the subframe #n may be a partial subframe. When subframe # (n-1) is the ending subframe among a plurality of subframes included in the license-exempt band burst, subframe #n may be a subframe located after the license-exclusion band burst. In this case, the length of sub-frame # (n-1) may be smaller than 1 ms, and the length of sub-frame # n may be 1 ms. That is, the subframe # (n-1) may be a partial subframe.

The base station may perform masking (e.g., scrambling) on the CRC of the DCI using the RNTI (S1110). The RNTI may be sent to the UE via RRC signaling. RNTI may be a C-RNTI or a U-RNTI (e.g., "UE-specific U-RNTI", "base station common U-RNTI", "license-exempt band cell common U-RNTI", etc.).

The base station can transmit the PDCCH (or EPDCCH) including the scrambled DCI in the sub-frame # (n-1) of the license-exempt band (S1120). The UE can receive from the base station a PDCCH (or EPDCCH) including the DCI scrambled in the subframe # (n-1) of the license-exempt band. The UE may perform decoding / descrambling on the DCI included in the PDCCH (or EPDCCH) using the RNTI (S1130). The UE can check the number of OFDM symbols of subframe # (n-1) or subframe #n based on the decoded / descrambled DCI (S1140). Further, the UE can check whether the subframe # (n-1) or the subframe #n is a partial subframe based on the decoded / descrambled DCI.

On the other hand, the U-RNTI can be used for activating or deactivating a license-exempted band cell. The U-RNTI used for activation of the license-exempt band cell may be referred to as "active U-RNTI ". The U-RNTI used for de-activation of the license-exempt band cell may be referred to as "deactivated U-RNTI ". The "active U-RNTI" and "deactivated U-RNTI" may be transmitted to the UE via RRC signaling. For example, "active U-RNTI" and "deactivated U-RNTI" may be included in "UCell configuration / system information ". Therefore, the UE can identify the "active U-RNTI" and the "deactivated U-RNTI" by receiving "UCell configuration / system information ". In addition, the "active U-RNTI" and the "deactivated U-RNTI" may be included in the license-exempt band cell related control information used for the "RRCConnectionReconfiguration" procedure. Therefore, the UE can confirm the "active U-RNTI" and the "deactivated U-RNTI" by performing the "RRCConnectionReconfiguration" procedure.

The "active U-RNTI" may be the same as or similar to the "deactivated U-RNTI ". An "active U-RNTI (or deactivated U-RNTI)" may be set for each license-exempt band cell. In this case, the "active U-RNTI (or deactivated U-RNTI)" may be used to request activation (or deactivation) of the license-exempt band cell to all UEs belonging to a specific license-exempt band cell. A PDCCH (or EPDCCH) containing a CRC masked (e.g., scrambled) with an "active U-RNTI (or deactivated U-RNTI)" set for a particular license- Lt; / RTI > Here, the UE-specific search space may be indicated by a CCE (or ECCE) index defined according to an "active U-RNTI (or deactivated U-RNTI) ".

An "active U-RNTI (or deactivated U-RNTI)" may be set for each UE. For example, an "active U-RNTI (or deactivated U-RNTI)" may be set for a particular UE among UEs belonging to an unlicensed band cell for which activation (or deactivation) is required. An "active U-RNTI (or deactivated U-RNTI)" set for a particular UE may be sent to a specific UE via RRC signaling. A PDCCH (or EPDCCH) containing a CRC masked (e.g., scrambled) with an "active U-RNTI (or deactivated U-RNTI)" set for a particular UE may be transmitted in the UE- . Here, the UE-specific search space may be indicated by a CCE (or ECCE) index defined according to an "active U-RNTI (or deactivated U-RNTI) ". Therefore, the UE can receive the PDCCH (or EPDCCH) using the "Activated U-RNTI (or deactivated U-RNTI)" in the UE- specific search space candidates, and by the received PDCCH (or EPDCCH) (Or deactivate) the license-exempt band cell based on the indicated information.

An active U-RNTI (or deactivated U-RNTI) and a C-RNTI allocated for each UE may be masked (e.g., scrambled) in the CRC at the same time. The PDCCH (or EPDCCH) based on the modulo 2 of the C-RNTI and the "active U-RNTI (or deactivated U-RNTI)" The CCE (or ECCE) index for transmission of the PDCCH (or EPDCCH) is calculated using a value based on the modulo 2 of the C-RNTI or C-RNTI and the "active U-RNTI (or deactivation U-RNTI) . (Or deactivated U-RNTI) in UE-specific search space candidates indicated by a value based on the modulo 2 of the C-RNTI and the " active U-RNTI (or deactivated U- (Or EPDCCH) using the received PDCCH (or EPDCCH) and activate (or deactivate) the license-exempt band cell based on the information indicated by the received PDCCH (or EPDCCH).

On the other hand, if a PDCCH (or EPDCCH) containing a CRC masked (e.g., scrambled) with an "active U-RNTI (or deactivated U-RNTI)" is received in subframe #n, (or deactivate) the license-exempt band cell from # (n + k). k may be an integer of 1 or more. For example, k may be 2, 4, 8, and so on. k is a fixed value and can be preset in the base station and the UE. Alternatively, k may be sent to the UE via RRC signaling. Alternatively, the DCI may include a new field indicating k, and the DCI may be sent to the UE via the PDCCH (or EPDCCH). Alternatively, k may be set based on a UE capability (e.g., receive / decode capability), where k may be a report procedure of UE capability information The transmission procedure of the response to the RRC signaling).

Information transmitted via the RRC message (or RRC signaling) defined for the U-RNTI described above may be included in a new system information block (SIB) for a license-exempt band cell. A new SIB for a license-exempted band cell can be transmitted periodically. In this case, a U-RNTI or SI-RNTI may be used.

Next, a method of activating and deactivating the licensed band cell will be described.

Activation and deactivation of the secondary cell of the license band may be performed based on an active / inactive MAC control element (MAC CE). Activation / deactivation When the index of the secondary cell of the license band is set to 0 in the MAC CE, this can indicate that the secondary cell of the license band operates in the inactive state. On the other hand, when the index of the secondary cell of the license band in the active / inactive MAC CE is set to 1, this can indicate that the secondary cell of the license band operates in the active state.

In addition, activation and deactivation of the license band for the secondary cell may be performed based on the time indicated by the SCell Inactivity Time field included in the RRC message. The SCell deactivation time field may indicate 20 ms, 40 ms, 80 ms, 160 ms, 320 ms, 640 ms, 1280 ms, and so on. For example, if the time indicated by the SCell deactivation time field has elapsed, the state of the secondary cell of the license band may be switched from the active state to the inactive state. If the SCell Inactivity Time field is not set, this may mean that the SCell Inactivity Time field indicates the time of infinity. The time indicated by the SCell Deactivation Time field may be applied to all secondary cells of the license band.

For example, if an activation / deactivation MAC CE indicating activation of a secondary cell of the license band is received in subframe #n, the UE can activate the secondary cell of the license band, and the subframe # (n + 8) (Or reactivate) the timer based on the time indicated by the SCell deactivation time field. Thereafter, the UE receives the PDCCH (or EPDCCH) for uplink or downlink scheduling (e.g., self scheduling or cross carrier scheduling) for the secondary cell of the activated license band In this case, the timer can be reactivated based on the time indicated by the SCell Deactivation Time field. Activation / deactivation indicating the deactivation of the secondary cell of the license band When the MAC CE is received or the time indicated by the SCell Deactivation Time field has elapsed, the UE may deactivate the secondary cell of the licensed band. In this case, the UE may deactivate the secondary cell of the license band before sub-frame # (n + 8).

On the other hand, activation and deactivation of the license-exempt band cell can be performed based on the activation / deactivation MAC CE, SCell deactivation time field. When the license-exempt band is occupied by another communication node, the UE waits until the time indicated by the SCell Deactivation Time field elapses (e. G., Until the state of the license-exempt band cell is switched from the active state to the inactive state) PDCCH (or EPDCCH). In this case, reactivation of the license-exempted band cell may be required. In order to solve this problem, activation and deactivation of the license-exempted band cell can be performed as follows.

Activation / deactivation based on minimum deactivation time

A "minimum deactivation time" can be set separately from the time indicated by the SCell deactivation time field included in the RRC message. The "minimum deactivation time" can be preset in the base station and the UE. Alternatively, the "minimum deactivation time" may be sent to the UE via the RRC message. The UE may obtain a SCell deactivation time field and a "minimum deactivation time " and compare the time indicated by the SCell deactivation time field with the" minimum deactivation time ". If the time indicated by the SCell Deactivation Time field is greater than the "minimum deactivation time ", the UE may activate a timer for the time indicated by the SCell Deactivation Time field and deactivate the license-exempted band cell if the timer expires can do. On the other hand, if the time indicated by the SCell deactivation time field is less than the "minimum deactivation time ", the UE can activate the timer for" minimum deactivation time " and deactivate the license- have. Here, the "minimum deactivation time" can indicate an infinite time. In this case, the UE may activate a timer for "minimum deactivation time" regardless of the SCell Deactivation Time field.

SCell  Activation / deactivation method based on time indicated by inactivity time field

The UE may calculate the changed time by multiplying the preset integer by the time indicated by the SCell deactivation time field. The UE may activate a timer for the changed time and deactivate the license-exempted band cell if the timer expires. Here, the preset constants can be preset in the base station and the UE. Alternatively, the predetermined integer may be transmitted to the UE via the RRC message.

Licensee  Defined for band cells Licensee  treason SCell  Activation / deactivation method based on inactivity time field

The UE may obtain the license-exempt band SCell deactivation time field via RRC signaling in the license band or the license-exempt band. The license-exempt SCell deactivation time field can be used for communication nodes operating in the license-exempt zone. The UE may activate a timer for the time indicated by the < RTI ID = 0.0 > license-exempted-SCell-deactivation-time-field < / RTI > and deactivate the license-exempted band cell if the timer expires.

The time (e.g., deactivation timer) indicated by the license-exempt SCell inactivity time field may be configured per SCell. In other words, the deactivation timer for the SCell in the license-exempt band can be configured differently for each SCell. In addition, the deactivation timer for SCell in the license-exempt band may be different from the deactivation timer for SCell in the license band.

Indicate infinite time SCell  Activation / deactivation method based on inactivity time field

If the SCell Deactivation Time field indicates an infinite time, the UE may activate or deactivate the license-exempt band cell based on the enabled / disabled MAC CE.

On the other hand, unlike the activation / deactivation of the licensed band cell, the activation / deactivation of the license-exempted band cell can be performed based on the PDCCH (or EPDCCH) instead of the MAC CE. A method of activating / deactivating a license-exempt band cell based on PDCCH (or EPDCCH) is as follows.

12 is a timing diagram showing a first embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 12, the base station and the UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station and the UE may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station transmits the PDCCH (or EPDCCH) including information requesting activation of the license-exempt band cell (hereinafter referred to as "activation request information") to the subframe # 2 of the license band cell (or another license- (n + 1). The CRC of the PDCCH (or EPDCCH) containing the activation request information may be masked (e.g., scrambled) based on the C-RNTI. In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., an uplink grant) for uplink resources of a license-exempt band cell, scheduling information for a downlink resource of a license-exempt band cell, .

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Here, the activation / deactivation MAC CE may be composed of 1 bit. For example, an enable / disable MAC CE set to 0 may request activation of a license-exempt band cell, and an enable / disable MAC CE set to 1 may request the deactivation of a license-exempt band cell. Conversely, the enable / disable MAC CE set to 0 may request the deactivation of the license-exempt band cell, and the enable / disable MAC CE set to 1 may request the activation of the license-exempt band cell.

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. The UE may obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the C-RNTI. That is, the UE can determine that activation of the license-exempt band cell is requested from the subframe # (n + 1 + N _Act ) by confirming the activation request information included in the PDCCH (or EPDCCH). For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

N _Act may be an integer of 1 or more. For example, N _Act may be 2, 4, 8, and so on. N _Act can be preset in the base station and the UE. Alternatively, N _Act may be sent to the UE via RRC signaling. Alternatively, the DCI may include a new field indicating the N _Act , and the DCI may be sent to the UE via the PDCCH (or EPDCCH). Alternatively, N _Act may be set based on the UE capability (e.g., receive / decode capability), where N _Act may be set to the reporting procedure of UE capability information (or RRC associated with license- The transmission procedure of the response to the signaling).

Since the license-exempt band cell is activated from the subframe # (n + 1 + N _Act ), the UE transmits PDSCH included in the subframe # (n + 1) of the license-exempt band cell scheduled by the PDCCH (or EPDCCH) Can not receive. Accordingly, the UE transmits an HARQ response (e.g., NACK, DTX) indicating failure in reception of the PDSCH included in the subframe # (n + 1) of the license-exempt band cell to the subframe # (n + To the base station. Alternatively, the UE transmits an HARQ response (e.g., ACK) indicating success of reception of the PDCCH (or EPDCCH) included in the subframe # (n + 1) of the license band cell to the subframe # n +5) to the base station.

If the HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 5) of the licensed band cell, the base station may determine that the UE has activated the license-exempted band cell. In this case, the base station can perform scheduling for the downlink resource (e.g., PDSCH) of the license-exempt band cell from the subframe # (n + 5 + m). Here, m can be set based on the capability of the base station (e. G., The decoding capability of the HARQ response). For example, m may be 2.

On the other hand, if the HARQ response is not received in the subframe # (n + 5) of the license band cell, the base station can determine that the UE has failed to activate the license-exempt band cell. In this case, the base station can again request the UE to activate the license-exempt band cell based on the activation method of the license-exempt band cell described above. The base station can perform scheduling for the downlink resource (or uplink resource) of the license-exempt band cell based on a preset operation policy before receiving the HARQ response.

The UE can activate the license-exempt band cell from the subframe # (n + 1 + N _Act ). For example, if N _Act is 4, the UE may activate the license-exempt band cell from sub-frame # (n + 5). That is, the activation timer can operate from the subframe # (n + 5) of the license-exempt band cell. The UE may receive the PDCCH (or EPDCCH) by performing monitoring on the common search space or UE-specific search space from the subframe # (n + 5) of the license-exempt band cell. For example, the UE may receive the PDCCH (or EPDCCH) in the subframe # (n + 7) of the license-exempt band cell. The UE may obtain scheduling information from the PDCCH (or EPDCCH) by performing descrambling based on the C-RNTI. The UE may receive the PDSCH in subframe # (n + 7) of the license-exempt band cell indicated by the scheduling information. The UE may obtain data from the PDSCH by performing descrambling based on the C-RNTI. Also, the UE may transmit the PUSCH to the base station through the uplink resource indicated by the scheduling information.

In order to deactivate the license-exempted band cell, the base station transmits a PDCCH (or EPDCCH) including information requesting deactivation of the license-exempt band cell (hereinafter referred to as "deactivation request information") to the license band cell (N + 11) of the subframe # (n + 11). The CRC of the PDCCH (or EPDCCH) containing the deactivation request information may be masked (e.g., scrambled) based on the C-RNTI. The deactivation request information may be at least one of activation / deactivation MAC CE requesting deactivation of the license-exempt band cell and information not indicating a specific meaning among the information included in the DCI (for example, RB information set to all 0, etc.) .

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 11) of the licensed band cell. The UE may obtain deactivation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the C-RNTI. That is, the UE can determine that the de-activation of the license-exempt band cell is requested from the sub-frame # (n + 11 + N _Dact ) by confirming the deactivation request information included in the PDCCH (or EPDCCH).

N _Dact may be an integer of 1 or more. For example, N _Dact may be 2, 4, 8, and so on. N _Dact can be preset in the base station and the UE. Alternatively, N _Dact may be sent to the UE via RRC signaling. Alternatively, the DCI may include a new field indicating N _Dact , and the DCI may be sent to the UE via the PDCCH (or EPDCCH). Alternatively, N _Dact may be set based on the UE capability (e.g., receive / decode capability), where N _Dact may be a report procedure of the UE ' The transmission procedure of the response to the RRC signaling).

The UE may deactivate the license-exempt band cell from the subframe # (n + 11 + N _Dact ). For example, if N _Dact is 2, the UE may deactivate the license-exempt band cell from sub-frame # (n + 13). That is, the UE may not perform monitoring for the common search space or the UE-specific search space from the subframe # (n + 13) of the license-exempt band cell.

13 is a timing diagram showing a second embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 13, the base stations, UE1 and UE2 may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base stations, UE1 and UE2, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). PDCCH (or EPDCCH) may be transmitted in the CCE (or ECCE) in the UE-specific search space indicated by the common search space or "license-exempt band cell common U-RNTI ". The CRC of the PDCCH (or EPDCCH) including the activation request information may be masked (e.g., scrambled) based on the " license-exempt band cell common U-RNTI ". In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like. The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

UE1 and UE2 may receive the PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. UE1 and UE2 can obtain activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the " license-exempt band cell common U-RNTI ". That is, UE1 and UE2 can determine that activation of the license-exempt band cell is requested by checking the activation request information included in the PDCCH (or EPDCCH). For example, UE1 and UE2 may determine that activation of an unlicensed band cell indicated by the CIF included in the DCI is requested. Alternatively, UE1 and UE2 may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE. UE1 and UE2 may activate the license-exempt band cell according to the decoding capability of the PDCCH (or EPDCCH). For example, UE1 may activate the license-exempt band cell from subframe # (n + 4). UE2 can activate the license-exempt band cell from sub-frame # (n + 5).

On the other hand, UE1 and UE2 can not receive the PDSCH included in the subframe # (n + 1) of the license-exempt band cell scheduled by the PDCCH (or EPDCCH). Therefore, UE1 and UE2 transmit an HARQ response (e.g., NACK, DTX) indicating failure in reception of the PDSCH included in sub-frame # (n + 1) of the license- 5) to the base station. Alternatively, UE1 and UE2 may transmit an HARQ response (e.g., ACK) indicating success of PDCCH (or EPDCCH) included in subframe # (n + 1) of the licensed band cell to subframe # (n + 5) to the base station. If a HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 5) of the licensed band cell, the base station may determine that UE1 and UE2 have activated the license-exempted band cell.

On the other hand, if the HARQ response is not received in the subframe # (n + 5) of the licensed band cell, the base station can determine that UE1 and UE2 failed to activate the license-exempt band cell. In this case, the base station can again request the UE to activate the license-exempt band cell based on the activation method of the license-exempt band cell described above. The base station can perform scheduling for the downlink resource (or uplink resource) of the license-exempt band cell based on a preset operation policy before receiving the HARQ response. Here, when the PDCCH (or the EPDCCH) including the activation request information is transmitted in the common search space, the UE1 and the UE2 may not transmit the HARQ response to the base station.

The base station can perform downlink transmission from the subframe # (n + 1 + N _Act ) of the license-exempt band cell. N _Act may be the same as the N _Act described with reference to FIG. If N _Act is 4, the base station may transmit the PDSCH scheduled by PDCCH (or EPDCCH) and PDCCH (or EPDCCH) in sub-frame # (n + 5) of the license-exempt band cell. Here, the CRC of the PDCCH (or EPDCCH) may be masked (e.g., scrambled) based on the C-RNTI (or the license-exempt band cell common U-RNTI). UE1 and UE2 can receive the PDCCH (or EPDCCH) by performing monitoring on the common search space or UE-specific search space in sub-frame # (n + 5) of the license-exempt band cell. UE1 and UE2 can obtain scheduling information from the PDCCH (or EPDCCH) by performing descrambling based on the C-RNTI (or the unlicensed band cell common U-RNTI). UE1 and UE2 may receive the PDSCH in subframe # (n + 5) of the license-exempt band cell indicated by the scheduling information. UE1 and UE2 can acquire data from the PDSCH by performing descrambling based on C-RNTI (or the unlicensed band cell common U-RNTI). In addition, UE1 and UE2 can transmit the PUSCH to the base station through the uplink resource indicated by the scheduling information.

When the PDSCH is received in the subframe # (n + 5) of the license-exempt band cell, UE1 and UE2 transmit an HARQ response (e.g., ACK) indicating successful reception of the PDSCH to subframe # n + 9) to the base station. Alternatively, when the PDSCH is not received in the subframe # (n + 5) of the license-exempt band cell, UE1 and UE2 transmit an HARQ response (e.g., NACK, DTX) To the base station in frame # (n + 9). If the HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 9) of the licensed band cell, the base station may determine that UE1 and UE2 have activated the license-exempted band cell.

On the other hand, if an HARQ response (e.g., ACK, NACK, DTX) is not received in subframe # (n + 9) of the license band cell, the base station determines that UE1 and UE2 failed to activate the license- . In this case, the base station can request activation of the license-exempt band cell again to UE1 and UE2 based on the activation method of the license-exempt band cell described above.

Meanwhile, in order to deactivate the license-exempted band cell, the base station may transmit the PDCCH (or EPDCCH) including the deactivation request information through the subframe # (n + 11) of the license band cell (or the license-exempt band cell). The CRC of the PDCCH (or EPDCCH) including the deactivation request information may be masked (e.g., scrambled) based on the " license-exempt band cell common U-RNTI ". The deactivation request information may be at least one of activation / deactivation MAC CE requesting deactivation of the license-exempt band cell and information not indicating a specific meaning among the information included in the DCI (for example, RB information set to all 0, etc.) .

UE1 and UE2 may receive the PDCCH (or EPDCCH) in subframe # (n + 11) of the licensed band cell. UE1 and UE2 can obtain deactivation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the " license-exempt band cell common U-RNTI ". That is, UE1 and UE2 can determine that the deactivation of the license-exempt band cell is requested from sub-frame # (n + 11 + N _Dact ) by confirming the deactivation request information included in the PDCCH (or EPDCCH). N _Dact may be equal to N _Dact described with reference to FIG.

UE1 and UE2 may deactivate the license-exempt band cell from subframe # (n + 11 + N _Dact ). For example, if N _Dact is 2, UE1 and UE2 may deactivate the license-exempt band cell from subframe # (n + 13). That is, UE1 and UE2 may not perform monitoring for the common search space or the UE-specific search space from the subframe # (n + 13) of the license-exempt band cell.

14 is a timing diagram showing a third embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 14, the base stations, UE1 and UE2 may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base stations, UE1 and UE2, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). PDCCH (or EPDCCH) may be transmitted in the CCE (or ECCE) in the UE-specific search space indicated by the common search space or "license-exempt band cell common U-RNTI ". The CRC of the PDCCH (or EPDCCH) including the activation request information may be masked (e.g., scrambled) based on the " license-exempt band cell common U-RNTI ". In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like.

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

In addition, there may exist UEs that did not receive the PDCCH (or EPDCCH) transmitted in the subframe # (n + 1) of the licensed band cell (or another unlicensed band cell in the active state) The PDCCH (or EPDCCH) including the activation request information can be retransmitted in the subframe # (n + 3) of the license band cell (or another unlicensed band cell in the active state). Here, the PDCCH (or EPDCCH) may be retransmitted before the subframe # (n + 1 + N _Act ). The PDCCH (or EPDCCH) retransmitted in the subframe # (n + 3) may be the same as the PDCCH (or EPDCCH) transmitted in the subframe # (n + 1).

After the PDCCH (or EPDCCH) containing the activation request information of the license-exempt band cell is transmitted, the operations of the base station, UE1 and UE2 may be the same as those of the base station, UE1 and UE2 described with reference to Fig. That is, when the retransmission operation of the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell is omitted in the subframe # (n + 3) of the license band cell, the timing chart shown in FIG. The timing may be the same as the illustrated timing.

15 is a timing diagram showing a fourth embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 15, a base station, UE1 and UE2 may form the wireless communication network described with reference to FIGS. 1 to 4, and may support a license band and a license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base stations, UE1 and UE2, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). PDCCH (or EPDCCH) may be transmitted in the CCE (or ECCE) in the UE-specific search space indicated by the common search space or "license-exempt band cell common U-RNTI ". The CRC of the PDCCH (or EPDCCH) including the activation request information may be masked (e.g., scrambled) based on the " license-exempt band cell common U-RNTI ". In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like.

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

UE1 may receive PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. UE1 can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the " license-exempt band cell common U-RNTI ". That is, the UE 1 can determine that activation of the license-exempt band cell is requested by checking the activation request information included in the PDCCH (or EPDCCH). For example, UE1 may determine that activation of the license-exempted band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE 1 may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE. Therefore, UE1 can activate the license-exempt band cell from sub-frame # (n + 4).

On the other hand, UE2 may not receive PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. In this case, UE2 may not be able to confirm activation of the license-exempted band cell is requested. Thus, UE2 may not be able to activate the license-exempt band cell.

Meanwhile, the base station can perform downlink transmission from the subframe # (n + 1 + N _Act ) of the license-exempt band cell. N _Act may be the same as the N _Act described with reference to FIG. If N _Act is 4, the base station may transmit the PDSCH scheduled by PDCCH (or EPDCCH) and PDCCH (or EPDCCH) in sub-frame # (n + 5) of the license-exempt band cell. Here, the CRC of the PDCCH (or EPDCCH) may be masked (e.g., scrambled) based on the C-RNTI (or the license-exempt band cell common U-RNTI). UE1 may receive the PDCCH (or EPDCCH) by performing monitoring on the common search space or the UE-specific search space in sub-frame # (n + 5) of the license-exempt band cell. UE1 can obtain the scheduling information from the PDCCH (or EPDCCH) by performing descrambling based on the C-RNTI (or the license-exempt band-cell common U-RNTI). UE1 may receive the PDSCH in subframe # (n + 5) of the license-exempt band cell indicated by the scheduling information. The UE 1 can acquire data from the PDSCH by performing descrambling based on the C-RNTI (or the unlicensed band cell common U-RNTI). Also, the UE 1 can transmit the PUSCH to the base station through the uplink resource indicated by the scheduling information.

When the PDSCH is received in the subframe # (n + 5) of the license-exempt band cell, the UE 1 transmits an HARQ response (for example, ACK) indicating the success of reception of the PDSCH to the subframe # 9) to the base station. Alternatively, when the PDSCH is not received in the subframe # (n + 5) of the license-exempt band cell, the UE 1 transmits an HARQ response (e.g., NACK, DTX) indicating failure in receiving the PDSCH to the subframe # (n + 9) to the base station. If the HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 9) of the licensed band cell, the base station may determine that UE1 has activated the license-exempted band cell.

On the other hand, the UE 2 can not receive the PDCCH (or EPDCCH) and the PDSCH in the subframe # (n + 5) of the license-exempt band cell because the state of the license-exempted band cell is in an inactive state. Therefore, UE2 can not transmit an HARQ response (e.g., ACK, NACK, DTX) for the PDSCH to the base station in subframe # (n + 9) of the licensed band cell. Since the HARQ response is not received in subframe # (n + 9) of the licensed band cell, the base station can determine that UE2 has not activated the license-exempted band cell. Thus, the base station can again request the UE2 to activate the license-exempt band cell based on the activation method of the license-exempt band cell described above.

16 is a timing diagram showing a fifth embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 16, the base station and the UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station and the UE may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). The CRC of the PDCCH (or EPDCCH) containing the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI) In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like.

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. The UE can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or activation U-RNTI) ". That is, the UE can determine that activation of the license-exempt band cell is requested from the subframe # (n + 1 + N _Act ) by confirming the activation request information included in the PDCCH (or EPDCCH). N _Act may be the same as the N _Act described with reference to FIG. For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

Since the license-exempt band cell is activated from the subframe # (n + 1 + N _Act ), the UE transmits PDSCH included in the subframe # (n + 1) of the license-exempt band cell scheduled by the PDCCH (or EPDCCH) Can not receive. Accordingly, the UE transmits an HARQ response (e.g., NACK, DTX) indicating failure in reception of the PDSCH included in the subframe # (n + 1) of the license-exempt band cell to the subframe # (n + To the base station. Alternatively, the UE transmits an HARQ response (e.g., ACK) indicating success of reception of the PDCCH (or EPDCCH) included in the subframe # (n + 1) of the license band cell to the subframe # n +5) to the base station.

If the HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 5) of the licensed band cell, the base station may determine that the UE has activated the license-exempted band cell. In this case, the base station can perform scheduling for the downlink resource (e.g., PDSCH) of the license-exempt band cell from the subframe # (n + 5 + m). Here, m can be set based on the capability of the base station (e. G., The decoding capability of the HARQ response). For example, m may be 2.

On the other hand, if the HARQ response (e.g., ACK, NACK, DTX) is not received in subframe # (n + 5) of the license band cell, the base station may determine that the UE has not activated the license- . In this case, the base station can again request the UE to activate the license-exempt band cell based on the activation method of the license-exempt band cell described above. The base station can perform scheduling for the downlink resource (or uplink resource) of the license-exempt band cell based on a preset operation policy before receiving the HARQ response.

The UE can activate the license-exempt band cell from the subframe # (n + 1 + N _Act ). For example, if N _Act is 4, the UE may activate the license-exempt band cell from sub-frame # (n + 5). That is, the activation timer can operate from the subframe # (n + 5) of the license-exempt band cell. The UE may receive the PDCCH (or EPDCCH) by performing monitoring on the common search space or UE-specific search space from the subframe # (n + 5) of the license-exempt band cell. For example, the UE may receive the PDCCH (or EPDCCH) in the subframe # (n + 7) of the license-exempt band cell. The UE can acquire the scheduling information from the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or active U-RNTI) ". The UE may receive the PDSCH in subframe # (n + 7) of the license-exempt band cell indicated by the scheduling information. The UE may obtain data from the PDSCH by performing descrambling based on "UE-specific U-RNTI (or active U-RNTI) ". Also, the UE may transmit the PUSCH to the base station through the uplink resource indicated by the scheduling information.

In order to deactivate the license-exempted band cell, the BS may transmit the PDCCH (or EPDCCH) including the deactivation request information in the subframe # (n + 11) of the license band cell (or the license-exempt band cell). The CRC of the PDCCH (or EPDCCH) containing the deactivation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or deactivated U-RNTI) The deactivation request information may be at least one of activation / deactivation MAC CE requesting deactivation of the license-exempt band cell and information not indicating a specific meaning among the information included in the DCI (for example, RB information set to all 0, etc.) .

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 11) of the licensed band cell. The UE can obtain the deactivation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or deactivated U-RNTI) ". That is, the UE can determine that the de-activation of the license-exempt band cell is requested from the sub-frame # (n + 11 + N _Dact ) by confirming the deactivation request information included in the PDCCH (or EPDCCH). N _Dact may be equal to N _Dact described with reference to FIG.

The UE may deactivate the license-exempt band cell from the subframe # (n + 11 + N _Dact ). For example, if N _Dact is 2, the UE may deactivate the license-exempt band cell from sub-frame # (n + 13). That is, the UE may not perform monitoring for the common search space or the UE-specific search space from the subframe # (n + 13) of the license-exempt band cell.

17 is a timing diagram showing a sixth embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 17, the base station and the UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support the license band and the license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station and the UE may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). The CRC of the PDCCH (or EPDCCH) containing the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI) In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like.

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

The UE may not receive the PDCCH (or EPDCCH) in the subframe # (n + 1) of the licensed band cell. In this case, the UE may not be able to transmit to the base station a HARQ response to the PDCCH (or EPDCCH) or a HARQ response to the PDSCH scheduled by the PDCCH (or EPDCCH). If the HARQ response to the subframe # (n + 1) of the licensed band cell is not received in the subframe # (n + 5) of the licensed band cell, the base station can determine that the UE has failed to activate the license- have. In this case, the base station can retransmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 7) of the license band cell (or another license-exempt band cell in the active state) . The CRC of the PDCCH (or EPDCCH) containing the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI) Here, the PDCCH (or EPDCCH) retransmitted in the subframe # (n + 7) may be the same as the PDCCH (or EPDCCH) transmitted in the subframe # (n + 1).

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 7) of the licensed band cell. The UE can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or activation U-RNTI) ". That is, the UE can determine that activation of the license-exempt band cell is requested from the subframe # (n + 7 + N _Act ) by confirming the activation request information included in the PDCCH (or EPDCCH). N _Act may be the same as the N _Act described with reference to FIG. For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

Since the license-exempt band cell is activated from the subframe # (n + 7 + N _Act ), the UE transmits the PDSCH included in the subframe # (n + 7) of the license-exempt band cell scheduled by the PDCCH (or EPDCCH) Can not receive. Therefore, the UE transmits an HARQ response (e.g., NACK, DTX) indicating failure in reception of the PDSCH included in the subframe # (n + 7) of the license-exempt band cell to the subframe # (n + To the base station. Alternatively, the UE transmits an HARQ response (e.g., ACK) indicating success of reception of the PDCCH (or EPDCCH) included in the subframe # (n + 7) of the license band cell to the subframe # n +11) to the base station.

If a HARQ response (e.g., ACK, NACK, DTX) is received in subframe # (n + 11) of the licensed band cell, the base station may determine that the UE has activated the license-exempted band cell. In this case, the base station can perform scheduling for the downlink resource (e.g., PDSCH) of the license-exempt band cell from the subframe # (n + 11 + m). Here, m can be set based on the capability of the base station (e. G., The decoding capability of the HARQ response). For example, m may be 2.

The UE can activate the license-exempt band cell from the subframe # (n + 7 + N _Act ). For example, if N _Act is 4, the UE may activate the license-exempt band cell from subframe # (n + 11). That is, the activation timer can operate from the subframe # (n + 11) of the license-exempt band cell. The UE may receive the PDCCH (or EPDCCH) by performing monitoring on the common search space or the UE-specific search space from the subframe # (n + 11) of the license-exempt band cell. For example, the UE may receive the PDCCH (or EPDCCH) in the subframe # (n + 13) of the license-exempt band cell. The UE can acquire the scheduling information from the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or active U-RNTI) ". The UE can receive the PDSCH in the subframe # (n + 13) of the license-exempt band cell indicated by the scheduling information. The UE may obtain data from the PDSCH by performing descrambling based on "UE-specific U-RNTI (or active U-RNTI) ". Also, the UE may transmit the PUSCH to the base station through the uplink resource indicated by the scheduling information.

18 is a timing diagram showing a seventh embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 18, a base station and a UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support a license band and a license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station, the UE, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). PDCCH (or EPDCCH) may be transmitted in the common search space or in the CCE (or ECCE) in the UE-specific search space indicated by the "UE-specific U-RNTI (or active U-RNTI) ". The CRC of the PDCCH (or EPDCCH) containing the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI) In addition, the PDCCH (or EPDCCH) may include scheduling information (e.g., uplink grant) for uplink resources of a license-exempt band cell, scheduling information for downlink resources of a license-exempt band cell, and the like.

The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG.

In addition, there may exist UEs that did not receive the PDCCH (or EPDCCH) transmitted in the subframe # (n + 1) of the licensed band cell (or another unlicensed band cell in the active state) The PDCCH (or EPDCCH) including the activation request information can be retransmitted in the subframe # (n + 3) of the license band cell (or another unlicensed band cell in the active state). Here, the PDCCH (or EPDCCH) may be retransmitted before the subframe # (n + 1 + N _Act ). The PDCCH (or EPDCCH) retransmitted in the subframe # (n + 3) may be the same as the PDCCH (or EPDCCH) transmitted in the subframe # (n + 1).

The UE may not receive the PDCCH (or EPDCCH) in the subframe # (n + 1) of the licensed band cell. In this case, the UE may not be able to transmit to the base station a HARQ response to the PDCCH (or EPDCCH) or a HARQ response to the PDSCH scheduled by the PDCCH (or EPDCCH). If the HARQ response to the subframe # (n + 1) of the licensed band cell is not received in the subframe # (n + 5) of the licensed band cell, the base station can determine that the UE has failed to activate the license- have.

Meanwhile, the UE may receive the PDCCH (or EPDCCH) in the subframe # (n + 3) of the licensed band cell. The UE can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or activation U-RNTI) ". That is, the UE can determine that activation of the license-exempt band cell is requested by checking the activation request information included in the PDCCH (or EPDCCH). For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

Further, the UE transmits an HARQ response (e.g., ACK) indicating successful reception of the PDCCH (or EPDCCH) included in the subframe # (n + 3) of the licensed band cell to the subframe # n +7) to the base station. If the HARQ response is received in subframe # (n + 7) of the licensed band cell, the base station may determine that the UE has activated the license-exempted band cell.

 The UE can activate the license-exempt band cell from the subframe # (n + 6). That is, the activation timer can be operated from the subframe # (n + 6) of the license-exempt band cell. On the other hand, the base station can transmit a PDSCH scheduled by the PDCCH (or EPDCCH) and the PDCCH (or EPDCCH) in the subframe # (n + 11) of the license-exempt band cell. Since the state of the license-exempted band cell is active, the UE can receive the PDCCH (or EPDCCH) in the subframe # (n + 11) of the license-exempt band cell and obtain scheduling information from the received PDCCH (or EPDCCH) can do. The UE may receive the PDSCH in subframe # (n + 11) of the license-exempt band cell indicated by the scheduling information.

19 is a timing diagram showing an eighth embodiment of a method for activating a license-exempt band cell.

Referring to FIG. 19, a base station and a UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support a license band and a license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station, the UE, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). The PDCCH (or EPDCCH) may be transmitted in the CCE (or ECCE) within the common search space or the UE-specific search space. The CRC of the PDCCH (or EPDCCH) including the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI, C-RNTI) The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG. The PDCCH (or EPDCCH) may further include scheduling information (e.g., uplink grant) for uplink resources of the license-exempt band cell, scheduling information for downlink resources of the license-exempt band cell, and the like.

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. The UE can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or activated U-RNTI, C-RNTI) That is, the UE can determine that activation of the license-exempt band cell is requested by checking the activation request information included in the PDCCH (or EPDCCH). For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

The descrambling for the PDCCH (or EPDCCH) may be completed within a time corresponding to one subframe. In this case, the UE can activate the license-exempt band cell from the next subframe (i.e., subframe # (n + 2)). That is, the activation timer can be operated from the subframe # (n + 2) of the license-exempt band cell.

On the other hand, the base station can transmit a PDSCH scheduled by the PDCCH (or EPDCCH) and the PDCCH (or EPDCCH) in the subframe # (n + 2) of the license-exempt band cell. Since the state of the license-exempt band cell is active, the UE can receive the PDCCH (or EPDCCH) in the subframe # (n + 2) of the license-exempt band cell and obtain the scheduling information from the received PDCCH (or EPDCCH) can do. The UE can receive the PDSCH in subframe # (n + 2) of the license-exempt band cell indicated by the scheduling information.

When the PDSCH is received in the subframe # (n + 2) of the license-exempt band cell, the UE may transmit an HARQ response indicating the successful reception of the PDSCH in the subframe # (n + 6) of the licensed band cell to the base station. When an HARQ response is received in the subframe # (n + 6) of the licensed band cell, the base station can determine that the UE has activated the license-exempt band cell.

Meanwhile, a time corresponding to a plurality of subframes may be required for reception of an HARQ response to a PDCCH (or EPDCCH) including activation request information of a license-exempt band cell. In order to solve this problem, a PUCCH based on a semi-static scheduling (SSS) can be configured, and a HARQ response to a PDCCH (or EPDCCH) including activation request information of a license- . Next, a method of activating the license-exempt band cell using the SSS-based PUCCH will be described.

20 is a timing diagram showing a ninth embodiment of a method of activating a license-exempt band cell.

Referring to FIG. 20, a base station and a UE may form the wireless communication network described with reference to FIGS. 1 to 4, and may support a license band and a license-exempt band. The base station can support carrier aggregation in the license and license-exempt bands. The base station, the UE, may be configured the same or similar to the communication node 500 described with reference to Fig. The timing of the subframe (or slot, OFDM symbol, etc.) of the license band may be the same as the timing of the subframe (or slot, OFDM symbol, etc.) of the license-exempt band. The configuration of the license-exempt band burst may be the same as or similar to the configuration of the license-exclusion band burst described with reference to Fig. The license-exempt band burst can be scheduled based on a cross-carrier scheduling scheme or a self-scheduling scheme.

The base station can transmit an RRC message including the SUC-based PUCCH related information to the UE. The SUC-based PUCCH-related information includes information on the subframe in which the PUCCH is configured, the resource information (e.g., frequency resource position, time resource position) in which the PUCCH is configured, the PDCCH (or EPDCCH) (E. G., Bit values, sequences, HARQ responses, etc.) that are transmitted to the base station (e. The subframe information constituting the PUCCH may indicate the number of subframes (N _REP ) between the subframe in which the PDCCH (or EPDCCH) including the activation request information is configured and the subframe in which the PUCCH is configured. N _REP may be an integer greater than or equal to one. The UE can acquire SUC-based PUCCH-related information by receiving an RRC message from a base station.

Meanwhile, the BS may transmit the PDCCH (or EPDCCH) including the activation request information of the license-exempt band cell in the subframe # (n + 1) of the license band cell (or another license-exempt band cell in the active state). The PDCCH (or EPDCCH) may be transmitted in the CCE (or ECCE) within the common search space or the UE-specific search space. The CRC of the PDCCH (or EPDCCH) including the activation request information may be masked (e.g., scrambled) based on the "UE-specific U-RNTI (or activated U-RNTI, C-RNTI) The activation request information may be at least one of information indicating an unlicensed band cell in a deactivated state (for example, CIF included in the DCI) and an activated / deactivated MAC CE requesting activation of an unlicensed band cell. Activation / Deactivation The MAC CE may be the same as the activation / deactivation MAC CE described with reference to FIG. The PDCCH (or EPDCCH) may further include scheduling information (e.g., uplink grant) for uplink resources of the license-exempt band cell, scheduling information for downlink resources of the license-exempt band cell, and the like.

The UE may receive the PDCCH (or EPDCCH) in subframe # (n + 1) of the licensed band cell. The UE can obtain the activation request information included in the PDCCH (or EPDCCH) by performing descrambling based on the "UE-specific U-RNTI (or activated U-RNTI, C-RNTI) That is, the UE can determine that activation of the license-exempt band cell is requested by checking the activation request information included in the PDCCH (or EPDCCH). For example, the UE may determine that activation of the license-exempt band cell indicated by the CIF included in the DCI is requested. Alternatively, the UE may determine that activation of the license-exempt band cell is requested based on the activation / deactivation MAC CE.

The descrambling for the PDCCH (or EPDCCH) can be completed within a time corresponding to one subframe. In this case, the UE can activate the license-exempt band cell from the next subframe (i.e., subframe # (n + 2)). That is, the activation timer can be operated from the subframe # (n + 2) of the license-exempt band cell. In addition, based on the PUCCH-related information based on the SSS, the UE determines whether the subframe in which the PUCCH based on the SSS is configured is the subframe # (n + 2) (n + 1) th or later). Therefore, the UE can transmit the reception response of the PDCCH (or EPDCCH) including the activation request information to the base station in the SSS-based PUCCH included in the subframe # (n + 2) of the license band cell. When a reception response of a PDCCH (or EPDCCH) including activation request information is received from an SSS-based PUCCH included in a subframe # (n + 2) of a licensed band cell, the base station activates the license- .

On the other hand, the base station can transmit PDSCHs scheduled by the PDCCH (or EPDCCH) and the PDCCH (or EPDCCH) in the subframe # (n + 4) of the license-exempt band cell. Since the state of the license-exempt band cell is active, the UE can receive the PDCCH (or EPDCCH) in the subframe # (n + 4) of the license-exempt band cell and obtain the scheduling information from the received PDCCH (or EPDCCH) can do. The UE can receive the PDSCH in the subframe # (n + 4) of the license-exempt band cell indicated by the scheduling information.

Next, a scheduling method of the license-exempt band cell will be described.

When the self-scheduling scheme is used, the scheduling information for the PDSCH included in the subframe #n of the license-exempt band cell can be transmitted through the PDCCH (or EPDCCH) included in the subframe #n of the license-exempt band cell. When the cross-carrier scheduling scheme is used, the scheduling information for the PDSCH included in the subframe #n of the license-exempt band cell is transmitted to the PDCCH (n) of the subframe #n of the license- Or EPDCCH).

The scheduling information (e.g., grant) for the PUSCH included in the subframe # (n + 4) of the license-exempt band cell is transmitted to the PDCCH (or the PDCCH included in the subframe #n of the license band cell or the license- EPDCCH). The scheduling information for the PUSCH included in the subframe # (n + 4) of the license-exempt band cell may be included in the DCI (DCI having format 0, for example). In this case, the UE can transmit the PUSCH through the uplink resources included in the subframe # (n + 4) of the license-exempt band cell indicated by the scheduling information. However, if the subframe # (n + 4) of the license-exempt band cell is occupied by another communication node, the UE can transmit the PUSCH as follows.

As a first method, the UE can abandon the transmission of the PUSCH in the subframe # (n + 4) of the license-exempt band cell when the subframe # (n + 4) of the license-exempt band cell is occupied by another communication node. In this case, the UE can monitor the license band cell or the license-exempt band cell to receive the PDCCH (or EPDCCH) containing the DCI (e.g., DCI with format 0) containing the new scheduling information for the PUSCH have. When a PDCCH (or EPDCCH) containing a DCI (e.g., a DCI with format 0) containing new scheduling information for a PUSCH is received, the UE sends an uplink The PUSCH can be transmitted through the resource.

As a second method, UE may determine the channel state from the subframe # (n + 4) of the license-exempt band count to a subframe _{# (n + 4 + N UL} _Window), license-exempt band, when the channel state is in an idle state The PUSCH can be transmitted through the UL resource of the cell. In this case, the UE may transmit the PUSCH based on the scheduling information received through the sub-frame #n of the license band cell or the license-exempt band cell. _{_Window} N _UL may be set in advance in the base station and the UE. Or, N _{UL _Window} may be transmitted to the UE through an RRC message (e.g., a newly defined RRC message to the unlicensed band cells). _{_Window} N _UL may be set to less than or equal to the maximum transmission period or the maximum channel occupation time. N _{UL _Window} may be an integer greater than or equal to zero. For example, when N _{UL _Window} is 0, the UE determines whether or not the PUSCH of sub-frame # (n + 4) of the license-exempt band cell # You can give up transmission. In this case, the UE can monitor the license band cell or the license-exempt band cell to receive the PDCCH (or EPDCCH) containing the DCI (e.g., DCI with format 0) containing the new scheduling information for the PUSCH have.

The methods according to the present invention can be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention or may be available to those skilled in the computer software.

Examples of computer readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (20)

A method of operating a user equipment (UE) in a communication network,
Receiving from a base station (PDCCH) a physical downlink control channel (PDCCH) including downlink control information (DCI) in a subframe n-1 of a license-exempt band;
Decoding the DCI using a common radio network temporary identifier (RNTI); And
And verifying the number of symbols of the subframe n of the license-exempt band based on the decoded DCI. The method according to claim 1,
Wherein the common RNTI is obtained from the base station via radio resource control (RRC) signaling. The method according to claim 1,
Wherein a cyclic redundancy check (CRC) of the DCI is scrambled based on the common RNTI. The method according to claim 1,
Wherein the subframe n-1 has a length of 1 ms and the subframe n is a partial subframe having a length less than 1 ms. The method according to claim 1,
And when the consecutive subframes are received from the base station, the subframe n is a start frame among the consecutive subframes. The method according to claim 1,
And when the consecutive subframes are received from the base station, the subframe n is an ending subframe among the consecutive subframes. The method according to claim 1,
The method comprising:
Determining whether the subframe n is a partial subframe having a length of less than 1 ms based on the decoded DCI. A method of operating a base station in a communication network,
Generating downlink control information (DCI) including information indicating a number of symbols of a subframe n of a license-exempt band;
Performing scrambling on a cyclic redundancy check (CRC) of the DCI using a common radio network temporary identifier (RNTI); And
Transmitting a physical downlink control channel (PDCCH) including a scrambled DCI to a user equipment (UE) through a subframe n-1 of the license-exempt band. The method of claim 8,
Wherein the common RNTI is sent to the UE via radio resource control (RRC) signaling. The method of claim 8,
Wherein the subframe n-1 has a length of 1 ms and the subframe n is a partial subframe having a length of less than 1 ms. The method of claim 8,
And when the sub-frames are transmitted to the UE, the sub-frame n is a start frame among the consecutive sub-frames. The method of claim 8,
Wherein when the consecutive subframes are transmitted to the UE, the subframe n is an ending subframe among the consecutive subframes. The method of claim 8,
Wherein the DCI further comprises information indicating that the subframe n is a partial subframe having a length of less than 1 ms. As a user equipment (UE) supporting a license-exempt band,
A processor; And
Wherein at least one instruction executed by the processor comprises a stored memory,
Wherein the at least one instruction comprises:
Receiving from the base station a physical downlink control channel (PDCCH) including downlink control information (DCI) in a subframe n-1 of the license-exempt band;
Decode the DCI using a common radio network temporary identifier (RNTI); And
And verifying the number of symbols in the sub-frame n of the license-exempt band based on the decoded DCI. 15. The method of claim 14,
Wherein the common RNTI is obtained from the base station via radio resource control (RRC) signaling. 15. The method of claim 14,
Wherein a cyclic redundancy check (CRC) of the DCI is scrambled based on the common RNTI. 15. The method of claim 14,
Wherein the sub-frame n-1 has a length of 1 ms and the sub-frame n is a partial sub-frame having a length of less than 1 ms. 15. The method of claim 14,
Wherein, when consecutive subframes are received from the base station, the subframe n is a start frame among the consecutive subframes. 15. The method of claim 14,
Wherein, when consecutive subframes are received from the base station, the subframe n is an ending subframe among the consecutive subframes. 15. The method of claim 14,
Wherein the at least one instruction comprises:
Based on the decoded DCI, the sub-frame n is a partial sub-frame having a length of less than 1 ms.

Images