KR20160134495A - Apparatus and method for performing transmission or reception of uplink control information in wireless communication system supporting carrier aggregation - Google Patents

Abstract

The present invention relates to an apparatus and a method for performing transmission or reception of uplink control information in a wireless communication system supporting carrier aggregation, capable of effectively performing a channel state information (CSI) report to a licensed assisted access (LAA) based wireless communication system. According to the present description, a terminal comprises: a processor to determine whether sync transfer of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) is set, and prepare transfer of an aperiodic CSI (A-CSI) report through a frequency or time resource different from a first serving cell when the first serving cell is failed to occupy a channel within an unlicensed band (UB) in a current sub-frame; a radio frequency (RF) unit to receive uplink grant for scheduling the PUSCH and requesting the A-CSI report, and transfer an A-CSI and hybrid automatic repeat request (HARQ) acknowledge/non-acknowledge (ACK/NACK) signal on the PUSCH at once, or divide the A-CSI and HARQ ACK/NACK signal into the PUSCH and the PUCCH, and perform transfer based on sync transfer setting of the PUSCH and the PUCCH; and a memory connected to the processor to store information for operating the processor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for transmitting or receiving uplink control information in a wireless communication system supporting carrier aggregation,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to wireless communication, and more particularly, to an apparatus and method for performing transmission or reception of uplink control information in a wireless communication system supporting carrier wave aggregation.

Carrier aggregation (CA) supports multiple carriers and is sometimes referred to as spectrum aggregation or bandwidth aggregation. The individual unit carriers tied by the carrier aggregation are referred to as component carriers (CC). Each element carrier is defined as the bandwidth and center frequency. With CA, it is possible to achieve the same effect as using a logically large band band by bundling a plurality of physically continuous or non-continuous bands in the frequency domain.

However, as wireless communication traffic has surged recently, it is still urgent to secure more frequencies. Accordingly, a method of performing a CA using frequencies of an unlicensed band (UB) as well as a licensed band (LB) that is exclusively allocated to a mobile communication provider is being discussed. The LTE (Long Term Evolution) standard uses a system serving as a primary serving cell (PCell) on a licensed band while setting carrier waves on a license-exempt band as a secondary serving cell (SCell) using system information (SI) Or LAA (Licensed Assisted Access) for setting at least one or more auxiliary serving cells.

Due to the nature of the LAA, different communication systems are constrained to equally share frequency resources. Thus, the serving cells of the license-exempted band are occupied by a user equipment (UE) or a base station (eNB) in an opportunistic manner to transmit and receive data and signals. For example, one LAA node (eg, a base station or a terminal) checks if a carrier in the license-exempt band is occupied by another LAA node or another communication system (eg, WiFi), and if the carrier in the license- So that communication can be performed. This series of operations is called LBT (Listen & before Talk).

In a wireless communication system, aperiodic channel state information (CSI) reporting is required for a base station to effectively perform downlink scheduling to a UE. However, when an LAA node (base station or terminal) performs communications using carriers in the unlicensed band, the occupancy of the license-exempted band is not always guaranteed, so the CSI report in the unlicensed band is uncertain. In other words, there has been no determination as to how the CSI report should be made if the carrier is lost in the timing at which the CSI report will be made on the carrier in the license-exempt band. In this case, the transmission and reception errors of data and deterioration of performance may be caused by the ambiguity of transmission of the CSI report. Therefore, there is a need for a method that can effectively perform CSI reporting in a LAA-based wireless communication system.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for transmitting or receiving uplink control information in a wireless communication system supporting carrier wave aggregation.

It is another object of the present invention to provide a method and apparatus for effectively performing CSI reporting in a wireless communication system based on LAA.

Another object of the present invention is to provide an apparatus and method for piggybacking aperiodic CSI reporting and / or HARQ-ACK in a LAA-based wireless communication system.

According to an aspect of the present invention, there is provided a terminal for transmitting uplink control information in a wireless communication system supporting carrier aggregation. The UE determines whether simultaneous transmission of the PUSCH and the PUCCH is established. If the PUSCH and the PUCCH are not simultaneously occupied in the first serving cell in the current subframe, A processor for preparing to transmit the A-CSI report through a frequency resource other than the PUSCH, a scheduler for receiving the uplink grant requesting the A-CSI report from the base station, scheduling the PUSCH, An RF unit for transmitting the A-CSI and HARQ ACK / NACK signals on the PUSCH at a time or dividing the PUSCH and the PUCCH, and a memory connected to the processor for storing information for driving the processor, .

According to another aspect of the present invention, there is provided a method for transmitting uplink control information by a terminal in a wireless communication system supporting carrier aggregation. The method comprises the steps of: determining whether simultaneous transmission of a PUSCH and a PUCCH is established; receiving a UL grant for scheduling the PUSCH and requesting the A-CSI report from a base station; Preparing for transmission of an A-CSI report through another time resource of the first serving cell or a frequency resource different from that of the first serving cell in case of failing to occupy the channel of the first serving cell in the UB in the current subframe; And transmitting the A-CSI and the HARQ ACK / NACK signal on the PUSCH at a time based on whether the PUSCH and the PUCCH are set to be simultaneously transmitted or the PUSCH and the PUCCH.

It is possible to prevent the aperiodic CSI and HARQ-ACK / NACK transmission from being dropped or discarded when the UE fails to occupy the channel during the (E) CCA for the license-exempt band. Thus, it is possible to improve the downlink performance by providing the base station with effective transmission of uplink control information.

Figure 1 shows examples of LAA deployment scenarios to which the present invention is applied.
FIG. 2 is a diagram for explaining an embodiment according to whether the A-CSI and the HARQ ACK / NACK can be transmitted / received within the license band and the license-exempt band, according to the present invention.
3 is an operational flowchart of a terminal according to the first embodiment of the present invention.
4 is a view for explaining an example of an A-CSI reporting method according to Case 1 in the first embodiment of the present invention.
5 is a view for explaining another example of the A-CSI reporting method according to Case 1 in the first embodiment of the present invention.
6A and 6B are views for explaining another example of the A-CSI reporting method according to Case 1 in the first embodiment of the present invention.
7 is a view for explaining an example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention.
8A to 8C are views for explaining another example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention.
9A to 9D are views for explaining another example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention.
10 is a view for explaining an example of the A-CSI reporting method according to Case 1 in the second embodiment of the present invention.
11 is a view for explaining an example of the A-CSI reporting method according to Case 2 in the second embodiment of the present invention.
12 is a block diagram illustrating a terminal and a base station according to an embodiment.

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

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

The wireless communication system herein is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes at least one base station 11 (BS). Each base station provides communication services for a particular geographic area or frequency domain and may be referred to as a site. A site may be divided into a plurality of areas, which may be referred to as sectors, and each of the sectors may have a different cell ID.

A user equipment (UE) constituting a wireless communication system may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS) device, a personal digital assistant (PDA), a wireless modem, a handheld device, and the like. A base station constituting a wireless communication system generally refers to a station that communicates with a terminal and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, a femto base station (FemtoeNodeB) (Home eNodeB: HeNodeB), a relay, a remote radio head (RRH), and the like. Cells 15a, 15b, and 15c should be interpreted in a generic sense to indicate a partial area covered by the base station, and are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

Hereinafter, a downlink refers to a communication or communication path from a base station to a terminal, and an uplink refers to a communication or communication path from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The layers of the radio interface protocol between the terminal and the base station can be divided into a first layer L1, a second layer L2 and a third layer L3. Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel.

The physical layer is connected to a MAC layer (Media Access Control) layer through a transport channel. The data is transmitted between the MAC layer and the physical layer through a transmission channel. The transport channel is classified according to how the data is transmitted over the air interface. Further, data is transmitted through physical channels between different physical layers (i.e., between the physical layer of the terminal and the base station). The physical channel can be modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time, frequency, and space generated by a plurality of antennas as radio resources.

For example, a physical downlink control channel (PDCCH) of a physical channel notifies a UE of resource allocation of a paging CHannel (DLH), a downlink shared channel (DL-SCH), and Hybrid Automatic Repeat Request (HARQ) And an uplink scheduling grant informing the UE of the resource allocation of the uplink transmission. A Physical Uplink Shared Channel (PDSCH) carries a DL-SCH including downlink data. In addition, the Physical Uplink Control CHannel (PUCCH) carries uplink control information such as HARQ ACK / NACK for downlink transmission, a scheduling request, and a CQI. The Physical Uplink Shared CHannel (PUSCH) carries an uplink shared channel (UL-SCH) including uplink data. If necessary, the PUSCH may include CSI (Channel State Information) information such as HARQ ACK / NACK and CQI according to the setup and request of the base station.

Simple cell segmentation of macro and micro cells makes it difficult to meet the growing demand for data services. Accordingly, a method of performing wireless communication using frequencies of an unlicensed band (UB) such as a WiFi band as well as a licensed band (LB) is being discussed. Wireless communication in the license-exempt band may be provided with the support of the licensed band's communication techniques to facilitate the wireless communication in the license-exempt band. License assisted access (LAA) refers to the operation of CA operations on one or more secondary serving cells operating in the license-exempt band or license-exempt spectrum, based on the assistance of the primary serving cell operating in the licensed band or spectrum. And the like. In other words, the LAA is a technique of bundling the licensed band and the license-exempted band using a CA as an anchor for a licensed carrier (LC) of the LTE license band. In this case, one of the serving cells in the license band is used as the main serving cell, and the serving cells in the license-exempted band can always be configured as the serving cell. Also, the license-exempt band is activated only through the CA, and may not perform LTE communication by itself. The terminal may access the network by using the license band and use the service, and the base station may combine the licensed band and the license-exempted band with the CA to offload the traffic of the license band to the license-exempt band.

Figure 1 shows examples of LAA deployment scenarios to which the present invention is applied. In each scenario, the number of licensed carriers and unlicensed carriers may be one or more, respectively.

Referring to FIG. 1, a scenario 1 is a case where a macro cell using a license carrier F1 (frequency 1) and a small cell using a license-exempt carrier F3 are connected to each other through a carrier aggregation (CA). In this case, the macro cell and the small cell may be non-co-located and may be connected to each other with an ideal back hole. Scenario 2 is a case where small cell # 1 using F2, which is a license carrier, and small cell # 2 using F3, which is a license-exempt carrier, are connected to carrier aggregation in addition to macro cell coverage. Scenario 3 is a case where there is a macro cell and a small cell # 1 using a license carrier F1 and a small cell # 1 using the small cell # 1 and a small cell # 2 using a license-exempt carrier F3 are connected to a carrier aggregation. In the scenario 4, there are a macro cell using the license carrier F1, a small cell # 1 using the license carrier F2, and a small cell # 2 using the license-exempt carrier F3. The small cell # 1 and the small cell # It is the case that it is connected to the aggregation.

Since the LAA establishes an opportunistic channel occupation environment, the base station performs a procedure for securing an unlicensed carrier (UC), which includes dynamic carrier selection (DCS) and LBT And a CCA (Extended Channel Assessment) / ECCA (Extended CCA) for determining a channel occupation state for performing the operation. The base station checks the occupancy status of the license-exempt frequency resource through the DCS and the CCA, and performs transmission and reception of wireless data by occupying the resource for a predetermined time if available.

In a LAA-based wireless communication system, channel state information (CSI) reporting is required for a base station to effectively perform downlink scheduling to a UE. The CSI report includes periodic CSI reporting and aperiodic CSI (A-CSI) reporting, which is why A-CSI reporting is important in the LAA environment. i) The channel environment of the carrier in the license-exempt band can be changed very fluidly depending on the carrier occupation method and the presence of the hidden node as compared with the license band carrier, and the time during which the carrier can be continuously occupied is LAA (E.g., the maximum channel occupation time is set at 4 ms in Japan and 13 ms in Europe) between nodes (or different wireless communication systems) The limited channel occupation time may be limited to obtain information. ii) Unlike the P-CSI report, the A-CSI report has a larger amount of CSI that the terminal can report to the base station at one time. iii) The need for A-CSI reporting is greater because the CSI measurement must be performed within the channel occupancy period for the carrier (or channel) occupied through LBT performance. The A-CSI report indication by the base station is requested to the UE by the base station together with the scheduling for the uplink transmission by the CSI request in the DCI format 0/4 through the (E) PDCCH transmission.

Although the A-CSI reporting is important in the LAA-based wireless communication system, because the occupation of the license-exempted bandwidth is not always guaranteed (according to the LBT implementation), the A-CSI There is a possibility that the request can not be performed due to the possibility of channel occupancy failure for uplink transmission of the UE. In other words, when the occupation of the license-exempt channel for uplink transmission of the terminal is lost at the timing at which A-CSI reporting (or A-CSI reporting and HARQ ACK / NACK (hereinafter referred to as A / N transmission) , There has been no determination as to how the A-CSI report should be made. In this case, the data transmission / reception error and performance deterioration may be caused by the ambiguity of transmission of A-CSI report (or A-CSI report and A / N transmission) by the terminal. Therefore, there is a need for a method that can effectively perform CSI reporting in a LAA-based wireless communication system. The above A / N transmission means A / N information for downlink data transmission (TB in PDSCH) and the above A / N information should also be transmitted in a subframe where a PUSCH channel for transmitting A-CSI report is transmitted , A-CSI and A / N information can be transmitted on the same PUSCH depending on whether the simultaneous PUCCH / PUSCH transmission is set up in the terminal.

FIG. 2 is a diagram illustrating an embodiment according to the present invention according to whether A-CSI and A / N can be transmitted and received within a license band and a license-exempt band.

2, for example, the license band LB 200 is composed of six component carriers (CC) or serving cells, and the license-exempt band UB 220 is composed of nine component carriers or serving cells It shows the composition.

The present specification discloses a configuration of a carrier aggregation (a plurality of serving cells is set) composed of carriers in at least one licensed band (e.g. main serving cell) and carriers in at least one or more license-exempt bands in an environment in which the LAA is set in the terminal, .

Throughout this specification, the first embodiment provides a method of transmitting A-CSI (i.e., a method of transmitting A-CSI) in the case where both A-CSI and / or A / N transmission / reception are possible in both license band 200 and license- The first embodiment relates to the case where A-CSI and A / N can be transmitted in the serving cell of UB), and the second embodiment relates to the case where A-CSI and / or A / N transmission / (I.e., A-CSI and A / N are only PUCCHs or PUSCHs of LB serving cells, or PUCCHs) in a case where A- And the operation in the case where transmission is limited through the PUSCH).

Each of the embodiments of the present invention is further subdivided into Case 1 and Case 2. Case 1 is a case where simultaneous transmission of PUSCH and PUCCH is not set in the terminal and Case 2 is a case where simultaneous transmission of PUSCH and PUCCH is set in the terminal to be. Hereinafter, the present invention publishes the operation of the terminal and the base station for the A-CSI and / or the A / N transmission and the device thereof for each embodiment and each case in each embodiment.

The methods proposed herein can assume that the operation is defined within each PUCCH serving cell group if PUCCH SCell is set. The methods proposed herein are applied independently to a serving cell group including PUCCH PCell and a serving cell group including PUCCH SCell (if set). Therefore, the A-CSI request / report and A / N transmission methods according to the present invention are valid only within each serving cell group and may not be considered among the serving cell groups. Therefore, if at least one UB is set in one serving cell group, the method proposed in this specification can be applied.

In addition, a UCI serving cell group can be newly defined for efficient UCI transmission of serving cells set on the LB and UB in one PUCCH serving cell group. The UCI serving cell group is a sub-group within a PUCCH cell group in the PUCCH serving cell group, which can be set by the base station through RRC signaling to the UE.

If the UCI serving cell group is not set, it is assumed that it operates in one of the PUCCH serving cell groups assumed above, or the following proposed method can be applied.

Here, the PUCCH serving cell group including the PCell may be set by default. If a PUCCH SCell is set in the UE, the UE may have a first PUCCH serving cell group (PUCCH Pcell group) and a second PUCCH serving cell group (PUCCH Scell group), i.e., two PUCCH serving cell groups.

Here, the same / different UCI serving cell group setting can be set in consideration of the type of control information to be transmitted by the UE according to the setting of the base station in the same PUCCH serving cell group.

- The format associated with the above-mentioned PUCCH transmission is one of PUCCH format 1 / 1a / 1b / 3/4/5. If a new PUCCH transport format is defined, it is also a format associated with the above PUCCH transport.

- The above-mentioned PUCCH serving cell group is applied if at least one PUCCH SCell is set from the base station by the terminal. The PCcell (default) and the set PUCCH SCells can not be included in the same serving cell group. Therefore, each serving cell group includes one PUCCH transmission serving cell and at least one SCell. The setting for each serving cell group is indicated by the base station via RRC signaling.

- The above-mentioned UCI serving cell group can be limited to only the serving cells (eg SCELL (UB)) set on the UB in one PUCCH serving cell group, or the serving cell set on LB and UB (eg PCell LB) and SCell (UB)). Such a configuration can be set in advance by the base station through RRC signaling to the terminal. The UCI serving cell group may be set and indicated to the UE by the base station to perform UCI transmission at the particular serving cell (s) within that group for UCI transmission of the serving cells within the group.

The setting of the UCI serving cell group according to the present invention avoids concentrating UBC transmissions associated with UB as well as serving cells associated with LBs with specific serving cells (e.g. PCell / PSCell) set on LB. Accordingly, it is possible to provide an effect of off-loading the data / control signal traffic to be transmitted to the UE or from the UE to the serving cells set on the UB, if any, and to balance the traffic load in the LTE network and its control To provide greater efficiency and flexibility.

3 is an operational flowchart of a terminal according to the first embodiment of the present invention.

Referring to FIG. 3, the UE receives an UL grant for a PUSCH of a UB serving cell (serving cell or CC belonging to the license-exempt band) (S300). Here, the uplink grant is downlink control information (DCI) transmitted from the base station to the UE, and the uplink grant is DCI format 0 or 4, and may include a CSI request. In addition, the uplink grant may or may not include scheduling information for PUSCH transmission over the UB serving cell. The UE may expect to transmit the PUSCH on the UB serving cell of the current (or specific) subframe according to the instruction of the UL grant. At this time, the PUSCH may include A-CSI, A-CSI, and A / N.

The CSI request has a size of 1 or 2 bits. (E) PDCCH in which a plurality of serving cells are configured in the UE and the uplink grant is transmitted on the UE specific search space or a plurality of CSI processes are set and the PDCCH (E) The CSI request field in the uplink grant has 2 bits if it is transmitted on a UE specific search space, otherwise the CSI request field is 1 bit. The UE does not expect to receive a plurality of A-CSI requests from the base station in the same subframe.

In the case where the CSI request is 2 bits, the content indicated by the CSI request may be different according to the number of the set serving cells, the transmission mode of the serving cell and / or the CSI subframe pattern setting.

For example, i) the CSI request is 2 bits, ii) the TM 1-9 is set in the terminal for all the serving cells, and iii) the terminal for which the CSI subframe pattern setting is not set for any serving cell, Trigger the A-CSI report in accordance with the instructions.

CSI Request Field Value Instructions 00 No aperiodic CSI report is triggered 01 Aperiodic CSI report is triggered for serving cell c 10 Aperiodic CSI report is triggered for a first set of serving cells configured by higher layers 11 Aperiodic CSI report is triggered for a second set of serving cells configured by higher layers

In the case where the above Table 1 can be utilized, one CSI report is performed for each serving cell. Thus, the CSI request field values "10" and "11" in Table 1 indicate which serving cells are triggering CSI reporting by each CSI request field value via RRC signaling (8 bit BIT STRING for either "10 & The base station can instruct the terminal using the uplink grant. On the other hand, the CSI request field "01" will be indicated to the UE by the base station when triggering the A-CSI report for the serving cell in which the PUSCH transmission indicated by the UL grant is performed.

The A-CSI reporting for up to five serving cells in the set of serving cells for A-CSI report triggering set by RRC signaling as above can be triggered.

As another example, a UE in which i) the CSI request is 2 bits, ii) the TM 10 is set in at least one serving cell, and iii) the UE for which the CSI subframe pattern setting is not set for any serving cell, Trigger the A-CSI report according to the content.

CSI Request Field Value Instructions 00 No aperiodic CSI report is triggered 01 Aperiodic CSI report is triggered for a set of CSI process (es) 10 Aperiodic CSI report is triggered for a 1st set of CSI process (es) configured by higher layers 11 Aperiodic CSI report is triggered for a 2nd set of CSI process (es) configured by higher layers

The CSI report can be performed based on the CSI process setting if the terminal has TM10 set in at least one serving cell or has a CSI subframe pattern set. Thus, the base station can establish a CSI process in the terminal, and the CSI process ID identifying the CSI process can be defined for each serving cell frequency. The range of CSI process ID values is from 1 to the maximum number of CSI processes (= 4). One CSI-RS resource configuration and one CSI-IM configuration are associated with one CSI process, and each CSI process can independently configure precoding matrix index (PMI) / rank information (RI) reporting.

CSI request values 10 and 11 (Trigger 10/11) can be set up to a maximum of five CSI processes (Across all serving frequencies) for the UE having the CSI process as described above. It is possible to set up to four CSI processes per serving frequency. Each CSI process includes configuration information for A-CSI reporting, and specifically includes settings related to CSI request values 01, 10, 11 in the uplink grant. Table 3 is an example of one setting. If an indication that the CSI request value in the uplink grant is equal to 10 is sent to the UE, the UE transmits the A-CSI report to the base station through the PUSCH with respect to the CSI processes corresponding to the Trigger 10. The number can be set up to 5 within each Trigger 10 or 11.

TM 10 LB-carrier PCell CSI process # 1 (Trigger 10), CSI process # 2 (Trigger 11) TM 10 LB-carrier SCell # 1 CSI process # 1 (Trigger 11) TM 10 UB-carrier SCell # 2 CSI process # 1 (Trigger 10), CSI process # 2 (Trigger 10) TM 9 UB-carrier SCell # 3 CSI process # 1 (Trigger 10)

The terminal does not expect the same CSI process to be associated with multiple Triggers 10, 11 redundantly. That is, a single CSI process is associated only with one trigger code point (among 10, 11) for acyclic CSI reporting. A-CSI reporting and P-CSI reporting can be performed only for an activated serving cell.

As another example, a UE with i) a CSI request of 2 bits and ii) a CSI subframe pattern setting is configured for at least one serving cell triggers A-CSI reporting according to the indications in Table 4 below.

CSI Request Field Value Instructions 00 No aperiodic CSI report is triggered 01 Aperiodic CSI report is triggered for a set of CSI process (es) and / or {CSI process, CSI subframe set} -pair (s) 10 Aperiodic CSI report is triggered for a first set of CSI process (es) and / or {CSI process, CSI subframe set} -pair (s) configured by higher layers 11 Aperiodic CSI report is triggered for a 2nd set of CSI process (es) and / or {CSI process, CSI subframe set} -pair (s)

In the case where Table 4 above can be applied, the A-CSI report is requested to the UE by the base station based on the CSI process and the CSI subframe aggregate, as in Table 2.

After receiving the uplink grant indicating the PUSCH (uplink transmission) in the serving cell of the UB in step S300, the UE checks the CSI request included in the uplink grant and transmits the CSI report as a response to the CSI request Prepare according to predetermined conditions. Here, the predetermined condition may mean the conditions according to Tables 1, 2 and 4 and the description thereof.

Also, the terminal may transmit the A-CSI, the A-CSI, the A / N, or the A-CSI, the A / N and the SR (scheduling request) To the base station.

For example, after determining a predetermined condition for preparing a CSI report transmission, the UE may determine a predetermined condition for transmitting an A-CSI or the like, determine a predetermined condition for transmitting an A-CSI, It is possible to judge a predetermined condition to be satisfied. Hereinafter, the UE determines a predetermined condition for transmitting an A-CSI and determines a predetermined condition for preparing a CSI report transmission. However, the technical idea of the present invention is not limited thereto.

The UE determines whether simultaneous PUSCH and PUCCH transmission is set (S305).

If simultaneous transmission is not set, the terminal performs the operation of Case 1 (S310, S315, S320), and if simultaneous transmission is set, the terminal performs the operation of Case 2 (S325, S330, S335).

First, the operation of Case 1 will be described in detail as follows. If the PUSCH and PUCCH simultaneous transmission are not set, the UE determines whether the (E) CCA in the current subframe and the UB serving cell (the UB serving cell of the specific subframe in which the PUSCH is scheduled to be transmitted according to the uplink grant) It is determined whether channel occupation is possible (S310).

If the (E) CCA for the UB serving cell is successful, the UE prepares A-CSI report transmission according to a predetermined condition and transmits A-CSI to the BS through the PUSCH on the UB serving cell (S315). As an example, if only transmission of A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the terminal transmits A-CSI to the base station via the PUSCH on the UB serving cell. As another example, if the PUSCH transmission is triggered in both the A-CSI and the A / N transmission in the scheduled subframe, the terminal transmits A-CSI and A / N to the base station via the PUSCH on the UB serving cell.

In step S310, if the CCA is not successful, the UE transmits A-CSI or the like to a base station through another frequency resource on the UB serving cell and / or a frequency resource different from the UB serving cell in step S320.

According to an aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to channel occupancy failure, if the UE determines that the uplink grant is valid for a predetermined time t, The CSI request is also valid. Accordingly, if the UE succeeds in (E) CCA for a UB serving cell within a predetermined time t, the UE can transmit A-CSI or the like to the base station through the UB serving cell. Detailed examples of this are described in Figures 5, 8 and 8A and 8B.

According to another aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is not possible due to the occupancy failure of the existing UB serving cell, if the PUSCH transmission is scheduled in at least one other serving cell on the same subframe The terminal can transmit A-CSI or the like to the base station through the other serving cell. Detailed examples of this are described in Fig. 5, Figs. 6A to 6B, 8 and 9A to 9D.

According to another aspect of the invention, step S320 may be replaced by automatically dropping the A-CSI report triggered by the CSI request.

In step S305, if the simultaneous transmission is set, the terminal performs the operation of Case 2 (S325, S330, and S335). The operation of Case 2 will be described in detail as follows. If the PUSCH and PUCCH simultaneous transmission are set, the UE determines whether the (E) CCA in the current subframe and the UB serving cell (the UB serving cell of the specific subframe in which the PUSCH is scheduled to be transmitted according to the uplink grant) is successful (S325 ).

If the (E) CCA for the UB serving cell is successful, the terminal prepares the A-CSI report transmission according to a predetermined condition and transmits the A-CSI report to the base station through the PUSCH on the UB serving cell, If the transmission is to be performed in the same subframe, the A / N is transmitted to the base station through the PUCCH (S330). As an example, if only transmission of A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the terminal transmits A-CSI to the base station via the PUSCH on the UB serving cell. As another example, if both the A-CSI report and the A / N transmission are to be performed in the PUSCH transmission scheduled subframe, the UE transmits the A-CSI report to the base station through the PUSCH on the UB serving cell, N to the base station via the PUCCH of the main serving cell or the PUCCH SCell. Here, the PUCCH SCell is a SCell set to RRC so that the PUCCH is transmitted. PUCCH SCell is a SCell set for PUCCH transmission that can be set to the terminal in addition to the PCUC PUCCH.

In step S325, if the CCA is not successful, the UE transmits A-CSI to the base station through another frequency resource on the UB serving cell or on a frequency resource different from that of the UB serving cell, To the base station through the PUCCH (S335).

According to an aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to channel occupancy failure, if the UE determines that the uplink grant is valid for a predetermined time t, The CSI request is also valid. Accordingly, if the UE succeeds in (E) CCA for a UB serving cell within a predetermined time t, the UE can transmit A-CSI to the BS through the UB serving cell. Detailed examples related to this are described in Fig. 5 and Fig.

According to another aspect of the present invention, although the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the occupation failure of the existing UB serving cell, the PUSCH transmission is scheduled in at least one other serving cell on the same subframe, The UE can transmit the A-CSI to the BS through the another serving cell. Detailed examples of this are described in Figs. 5, 6A-B, 8, 8A and 9A-D.

According to another aspect of the present invention, step S335 may be replaced by a step in which the terminal automatically aborts or grants the A-CSI report triggered by the CSI request.

On the other hand, if the BS does not have the uplink transmission (i.e., PUSCH) including the A-CSI in the resource scheduled through the blind decoding, the base station recognizes that the CCA has failed (E) The A-CSI report can be received from the terminal using PUSCH (if any).

Hereinafter, the first embodiment shown in FIG. 3 and a method of reporting A-CSI for each case will be described in detail.

1. First Embodiment: Case 1

4 is a view for explaining an example of an A-CSI reporting method according to Case 1 in the first embodiment of the present invention. This is the case where the terminal succeeds in (E) CCA.

Referring to FIG. 4, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S400). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S405). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. The set of serving cells or the set of CSI processes corresponding to or associated with the A-CSI trigger by the CSI request of the UL grant of S405 is determined by the upper layer setting such as the RRC layer. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes) after the subframe that received the uplink grant according to the instruction of the UL grant.

If the MS succeeds in (E) CCA for PUSCH transmission of U-SCell # 2 (S410), the MS transmits A-CSI or the like to the BS through the PUSCH of U-SCELL # 2 (S415). For example, if there is only transmission of A-CSI in the subframe in which the PUSCH transmission is scheduled, the terminal transmits A-CSI to the base station via the PUSCH on U-SCell # 2. As another example, if the PUSCH transmission has both A-CSI and A / N transmission in the scheduled subframe, the terminal transmits A-CSI and A / N to the base station via the PUSCH on U-SCELL # 2.

5 is a view for explaining another example of the A-CSI reporting method according to Case 1 in the first embodiment of the present invention. This is the case where the terminal fails the CCA and only the A-CSI report exists.

Referring to FIG. 5, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE via the L-PCell and U-SCell # 2, respectively (S500). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S505). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink grant of S505 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes) after the subframe that received the uplink grant according to the instruction of the UL grant.

However, if the UE fails to (E) CCA for PUSCH transmission of U-SCell # 2 (S510), the terminal can not transmit A-CSI or the like to the base station via the PUSCH of U-SCELL # 2 (S515). Examples of the method that the terminal can take in step S515 are as follows.

<Method 1-1>

According to Method 1-1, all A-CSI reports associated with A-CSI report triggering (i.e., all CSI processes associated with the triggering or CSI reporting of all serving cells) and A / N transmission / N &lt; / RTI &gt; transmission) is to be given together with the uplink PUSCH transmission. According to the method 1-1, when the A-CSI report and the additional A / N transmission are abandoned due to the CCA failure in the UB band (i.e., uplink transmission failure), the downlink performance may be adversely affected. In fact, even if the base station succeeds in occupying the downlink channel, sufficient channel information from the terminal can not be provided, so only scheduling that provides a very low data rate may be possible. Even such conservative scheduling transmissions are likely to fail at the terminal's channel environment (very low SINR). In addition, since the A / N reception failure by the base station immediately affects the downlink performance, a method capable of supplementing A-CSI and A / N transmission is needed.

To this end, the terminal acquires additional resources capable of transmitting A-CSI and the like. For example, the UE can use a different time resource (Method 1-2) on U-SCell # 2 or a frequency resource (Method 2) different from U-SCell # 2 for transmission such as A-CSI.

<Method 1-2>

According to the method 1-2, if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to channel occupancy failure, if the UE determines that the uplink grant is valid for a predetermined time t (S520) CSI requests within the grant are also valid. Therefore, if the UE succeeds in CCA for U-SCell # 2 within a predetermined time t, it can transmit A-CSI to UTRAN through U-SCELL # 2.

For example, referring to FIG. 5, although the PUSCH transmission by the uplink grant G fails to occupy the channel of the U-SCell # 2 in the scheduled subframe n (S510), the UE returns again within a predetermined time t (S520) The channel occupation of the U-SCell # 2 can be succeeded (S525). In this case, the UE can perform the PUSCH transmission for the subframe n in the subframe n + k in which the k subframe has elapsed (S530). In this case, the CSI request at S505 is still considered valid. However, if the channel occupation of the U-SCell # 2 is not succeeded even after waiting for a predetermined time (S520), the UE abandons the A-CSI request and all uplink grants.

Here, the predetermined time may be defined based on predefined time information (e.g., a subframe unit) or a timer within the terminal. Or a predetermined period of time may be defined as the number of PUSCH transmission subframes indicated by the PDCCH / EPDCCH having a new DCI format (A-CSI request field) indicating a PUSCH transmission on a plurality of subframes A set of numbers or indices). The predefined time information may be defined as the time at which the UE looks at the success or failure of channel occupancy within a specific number of subframes. Alternatively, the timer starts when the terminal fails to transmit the PUSCH, and all the information in the uplink grant may be abandoned when the set timer value expires. The timer value may be set by the base station or may be predetermined.

<Method 1-3>

According to method 1-3, although the PUSCH transmission in the subframe indicated by the uplink grant is not possible due to the occupancy failure of U-SCell # 2, if the PUSCH transmission is scheduled in at least one other serving cell on the same subframe The terminal may transmit A-CSI or the like to the base station through the other serving cell (S535, S540).

In one aspect, if there is an uplink transmission (PUSCH) in the main serving cell or the PUCCH SCell of the same subframe, the UE transmits PUSCH to the uplink transmission (PUSCH) of the main serving cell or PUCCH SCell. And transmits it to the base station.

In another aspect, if the uplink (PUSCH) transmission is scheduled in at least one or more secondary serving cells of the same subframe and the uplink (PUSCH) transmission is not scheduled in the primary serving cell or the PUCCH SCell, The A-CSI may be piggybacked on the uplink transmission of the selected secondary serving cell and transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Or the selected serving cell may have the highest index among the at least one serving cell.

In another aspect, if the uplink (PUSCH) transmission is scheduled in at least one or more secondary serving cells of the same subframe and the uplink (PUSCH) transmission is not scheduled for the primary serving cell or the PUCCH SCell, If there is one or more secondary serving cells (e.g., licensed SCell, L-SCell) set on the LB among the secondary serving cells of the LB, the UE transmits the uplink transmission of the selected secondary serving cell on the index- The CSI can be piggybacked and transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Or the selected serving cell may have the highest index among the at least one serving cell. If there are no secondary serving cells on the LB, the UE abandons the A-CSI report or reports A-CSI through the secondary serving cell with the lowest or highest secondary serving cell index on the UB. However, if there is no serving cell, the A-CSI report and the uplink transmission are of course abandoned.

6A and 6B are views for explaining another example of the A-CSI reporting method according to Case 1 in the first embodiment of the present invention. This is the case where the terminal fails the CCA and there is a report of A-CSI and an A / N transmission.

6A and 6B, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S600). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S605). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the UL grant in S605 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes) after the subframe that received the uplink grant according to the instruction of the UL grant.

<Method 1-4>

For example, the PUSCH transmission in the subframe indicated by the uplink grant is disabled due to the occupation failure of U-SCell # 2 (S610), and the uplink transmission (PUSCH) is not scheduled in the other serving cells in the same subframe (S615), the UE drops the A-CSI triggered by the CSI request of the uplink grant (S620), and transmits the A / N. At this time, the terminal transmits the A / N through the PUCCH of the main serving cell (S625) or transmits the PUCCH through the PUCCH SCell (S630).

Here, the PUCCH is transmitted through the set secondary serving cell when the serving cell in which the scheduled PUSCH is transmitted is included in the PUCCH secondary serving cell group, and the A / N is transmitted through the PUCCH secondary serving cell. Otherwise, if the PUCCH secondary serving cell is not set or the serving cell to which the scheduled PUSCH is transmitted belongs to the serving cell group including the PCcell, the A / N is transmitted via the PCUC's PUCCH.

As another example, the PUSCH transmission in the subframe indicated by the uplink grant becomes impossible due to the occupation failure of U-SCell # 2 (S610), and the uplink transmission (PUSCH) (S615), the UE drops both the A-CSI as well as the A-CSI triggered by the CSI request of the UL grant.

<Method 1-5>

According to the method 1-5, even if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the occupancy failure (S610) of the U-SCell # 2 (S620), at least one other serving If the PUSCH transmission is scheduled in the cell, the UE can transmit A-CSI or the like to the BS through the other serving cell.

Specifically, if the UE fails the CCA for the PUSCH transmission of the U-SCell # 2 (S610) and the PUSCH transmission is scheduled in at least one other serving cell on the same subframe (S635) (S645, S650, S655) through the other serving cell. At this time, a rule for selecting another serving cell for transmission such as A-CSI is as follows.

In one aspect, if PUSCH transmission is scheduled in the main serving cell of at least one other serving cell of the same subframe, the terminal transmits both A-CSI and A / N on the PUSCH of the main serving cell (S645).

In another aspect, if a PUSCH transmission is scheduled in a main serving cell of at least one other serving cell of the same subframe and a PUSCH transmission is scheduled in at least one secondary serving cell, then the at least one secondary serving cell is LB The UE transmits all A-CSI and A / N to the base station through the PUSCH on the selected serving cell based on the index. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell (S655). Alternatively, the selected serving cell may have the highest index among the at least one serving cell (S650).

In another aspect, if the PUSCH transmission is scheduled in the main serving cell of the same subframe but the PUSCH transmission is scheduled in at least one other serving cell, the UE selects the lowest L Both A-CSI and A / N can be transmitted through the PUSCH of the secondary serving cell corresponding to the -SCell index (S650). Or if the PUSCH transmission in the serving cell of the LB is not scheduled but the PUSCH transmission is scheduled in the serving cell included in the UB, the UE transmits the PUSCH in the UB to the lowest index of the scheduled serving cells Both A-CSI and A / N can be transmitted through the PUSCH of the corresponding secondary serving cell (S655).

2. First Embodiment: Case 2

7 is a view for explaining an example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention. This is the case where the terminal succeeds in (E) CCA.

Referring to FIG. 7, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S700). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S705). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. The set of serving cells or the set of CSI processes corresponding to or associated with the A-CSI trigger by the CSI request of the UL grant of S705 is determined by the upper layer setting such as the RRC layer. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes) after the subframe that received the uplink grant according to the instruction of the UL grant.

If the MS succeeds in (E) CCA for PUSCH transmission of U-SCell # 2 (S710), the MS transmits A-CSI or the like to the BS through the PUSCH of U-SCELL # 2 (S715). As an example, if only the transmission of A-CSI is triggered in the subframe in which the PUSCH transmission is scheduled, the terminal transmits the A-CSI to the base station via the PUSCH on the U-SCELL # 2. As another example, if the PUSCH transmission has both A-CSI and A / N transmission in the scheduled subframe, the terminal transmits A-CSI to the base station via the PUSCH on U-SCell # 2, To the base station via the serving cell or PUCCH SCell.

As another example, it is assumed that one UCI serving cell group in one PUCCH serving cell group is set to the UE. It is assumed that there is a U-SCell # 2/3/4 in one UCI serving cell group. (PDU) indicating PDSCH and / or PDCCH indicating SPS release (S700) in the serving cell (eg U-SCell # 2/3/4) in the same UCI serving cell group in the subframe in which the PUSCH (S715) transmission having the A- Associated with the serving cell (s) in the UCI serving cell group within the PUSCH (S715) transmission if there is an associated additional A / N transmission and the CCA performed by the terminal for the PUSCH (S715) UCI information (eg, A-CSI, A / N).

However, all UCIs including at least A / N, SR, etc. associated with the set serving cell in the LB are reported to the base station by the terminal in the established serving cell in the LB. Therefore, in this method, the UCI for the serving cells set on the LB including at least the A / N and the SR is transmitted in the serving cell set on the LB. For example, referring to FIG. 7, the A / N information corresponding to the PDSCH (S700) transmitted from the PCell is always transmitted from the PCell. Also, if there is a PDSCH transmission in SCell # 1 (LB), it is also sent to PCell.

8A is a view for explaining another example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention. This is the case where the terminal fails the (E) CCA and only the A-CSI report exists.

Referring to FIG. 8A, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S800). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S805). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The content indicated by the CSI request value (Trigger 10) is a set of first serving cells according to Table 1 and is a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the UL grant of S805 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes) after the subframe that received the uplink grant according to the instruction of the UL grant.

However, if the terminal fails to (E) CCA for PUSCH transmission of U-SCell # 2 (S810), the terminal can not transmit A-CSI or the like to the base station via the PUSCH of U-SCELL # 2 (S815). Examples of methods that the terminal can take in step S815 are as follows.

<Method 2-1>

Method 2-1 is the same as Method 1-1 in Case 1. Specifically, according to method 2-1, all A-CSI reports related to A-CSI report triggering (i.e., all CSI processes associated with the triggering or CSI report of all serving cells) and A / N transmission (I.e., when A / N transmission is to be performed in the uplink), together with the uplink PUSCH transmission.

<Method 2-2>

Method 2-2 is the same as Method 2-1 of Case 1. Specifically, according to the method 2-2, even if the PUSCH transmission in the subframe indicated by the UL grant is impossible due to the channel occupancy failure, if the UE determines that the UL grant is valid for a predetermined time t (S820) The CSI request in the uplink grant is also valid. Therefore, if the UE succeeds in CCA for U-SCell # 2 within a predetermined time t, it can transmit A-CSI to UTRAN through U-SCELL # 2.

For example, referring to FIG. 8, although the PUSCH transmission by the uplink grant G fails to occupy the channel of the U-SCell # 2 in the scheduled subframe n (S810), the UE returns again within a predetermined time t (S820) The channel occupation of the U-SCell # 2 can be succeeded (S825). In this case, the UE can perform the PUSCH transmission for the subframe n in the subframe n + k in which the k subframe has elapsed (S830). In this case, the CSI request at S805 is still considered valid. However, if channel occupation of U-SCell # 2 is not succeeded until the predetermined time (S820) expires, the UE abandons the A-CSI request and all uplink grant. Here, specific embodiments related to a certain time are the same as the method 1-2.

<Method 2-3>

According to method 2-3, although the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the occupation failure of U-SCell # 2, if the PUSCH transmission is scheduled in at least one other serving cell on the same subframe The terminal can transmit A-CSI to the base station through the other serving cell (S835, S840).

In one aspect, if there is an uplink transmission (PUSCH) in the main serving cell or the PUCCH SCell of the same subframe, the UE transmits PUSCH to the uplink transmission (PUSCH) of the main serving cell or PUCCH SCell. And transmits it to the base station.

In another aspect, if the uplink (PUSCH) transmission is scheduled in at least one or more secondary serving cells of the same subframe and the uplink (PUSCH) transmission is not scheduled in the primary serving cell or the PUCCH SCell, The A-CSI may be piggybacked on the uplink transmission of the selected secondary serving cell and transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Or the selected serving cell may have the highest index among the at least one serving cell.

In another aspect, if the uplink (PUSCH) transmission is scheduled in at least one or more secondary serving cells of the same subframe and the uplink (PUSCH) transmission is not scheduled for the primary serving cell or the PUCCH SCell, If there is one or more secondary serving cells (e.g., licensed SCell, L-SCell) set on the LB among the secondary serving cells of the LB, the UE transmits the uplink transmission of the selected secondary serving cell on the index- The CSI can be piggybacked and transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Or the selected serving cell may have the highest index among the at least one serving cell. If there are no secondary serving cells on the LB and there are other secondary serving cells on which the PUSCH transmission on the UB is scheduled, the UE may abandon the A-CSI report or transmit the A-CSI report on the other secondary serving cell.

8B illustrates a case where A-CSI reporting and / or A / N transmission according to Case 2 exist in a specific UL subframe in the first embodiment of the present invention. In FIG. 8B, at least one UCI serving cell group is set in one PUCCH serving cell group, and A / N information corresponding to the PDSCH transmission to the license serving cell (LB) is always transmitted in the PUCCH / PUSCH of the serving serving cell .

That is, an environment in which an additional UCI serving cell group is set in the terminal by the base station is considered in one PUCCH serving cell group. The UCI serving cell group may be set up for one or a plurality of UCI transmissions in one PUCCH serving cell group. Two UCI serving cell group # 0 / UCI serving cell group # 1 are set in the PUCCH serving cell group (PUCCH Cell Group # 0) to the UE by the base station. SCELL # 1 / SCell # 2 set on the UB and Ull SCELL # 3 / SCell # 4 on the UCI serving cell group # 1 are configured in the UCI serving cell group # 0, respectively. The UCI information for the serving cells (SCell # 1/2) belonging to the UCI serving cell group # 0 in the specific subframe (subframe n) is transmitted to the SCell # 2, which is the UL grant 862 having the A- 2 &lt; / RTI &gt;

Also, according to the present invention, the A / N information corresponding to the PDSCH transmitted from the license-exempt serving cell UB is transmitted from the PUSCH of the unlicensed serving cell.

On the other hand, in the setting for the A-CSI reporting request of the licensed serving cell, if the "trigger code point" for the A-CSI report (eg Trigger 01/10/11 associated with the CSI request field in the UL grant, ) Is not restricted to serving cells in the UCI serving cell group, the A-CSI report for the licensed serving cell is transmitted (if any) with those of the unlicensed serving cell via the PUSCH of the unlicensed serving cell Can be.

For example, if the A-CSI reporting configuration for the licensed serving cell PCell uses Table 1, then the PUSCH transmission corresponding to the CSI request field value 10 (e.g., Trigger 10) and having the A-CSI reporting request, , The A-CSI report for PCell, which is the license serving cell, may be performed in SCell, which is the unlicensed serving cell. These considerations apply to the A-CSI reporting configuration and its triggering method, which are determined by different transmission modes (eg TM9 / 10) and / or eIMTA transmission settings and / 4, the same can be applied to all of them.

More specifically, looking at Figure 8b, UCI serving cell group UCI the A / N for the license serving cell (PCell, SCell # 0) is not set to, SR and / or A-CSI reporting is performed at sub-frame n The PUSCH of the serving serving cell (if there is only PUSCH, only A / N, SR) or the selected PUSCH (if there is PUSCH transmission, A-CSI Or A-CSI, A / N, SR). The selected PUSCH means that if the PUSCH transmission in a plurality of license serving cells occurs in the same subframe, the UCI information is transmitted in the PCell (if there is a PUSCH transmission) or not in the SCs only in the license serving cell If there is one, the UCI information is transmitted from the SCell having the smallest SCELL index.

On the other hand, one UCI transmission timing in the UCI serving cell group # 0 (850) receives the UL grant based on the information indicated by the A-CSI report request field and / or the A / N report request field in the UL grant And the corresponding UCIs can be transmitted from the unlicensed serving cell 855 in which the PUSCH transmission of the subframes is performed after at least four (4 < =) subframes.

In the present invention, it is proposed to introduce an A / N reporting request field (1 bit) in the DCI format to indicate A / N transmission timing. If an A / N report request in one UL grant is directed by the base station (set to 1), an A / N report can be performed on the serving cell through which the corresponding PUSCH is transmitted. In the present invention, when PUSCH transmission is indicated by UL grants having the A-CSI report request and / or A / N report request on a plurality of serving cells in the same subframe, each PUSCH having the same UCI information Transmission may be performed in a plurality of serving cells.

Alternatively, PUSCH transmission on a plurality of serving cells in the same subframe as above may be performed by a plurality of UL grants instead of directing the plurality of A-CSI report requests and / or a plurality of A / N report requests by A / The same UCI may be sent to all / some PUSCH transmissions on a plurality of serving cells scheduled in a subframe associated with the corresponding UCI transmission timing via only one A-CSI report request (if any) without introducing the N report request field . The most significant difference from the above method is that the UCI instructs transmission of the PUSCH having the same UCI through the UL grant or transmission of all / some (one) PUSCH scheduled in the subframe corresponding to the corresponding UCI transmission timing without such signaling, Transmission can be performed. If the UCI overhead that may occur due to sending the same UCI to all PUSCH transmissions is a problem, the corresponding UCI may be transmitted only in some or one PUSCH transmission in the order of the serving cell having the smallest SCELL index among the plurality of PUSCHs. Or the serving cells corresponding to some PUSCH transmissions may be set in advance by the RRC to the UE together with the UCI serving cell group setting.

This UCI transmission can prevent the UCI report from being dropped in the situation that the PUSCH can not be transmitted due to the CCA busy, and it is possible to improve the UCI reception reliability by obtaining the combining gain through the repetitive UCI transmission to provide. In addition, the proposed method has the advantage of reducing the blind decoding load of the base station due to various reasons such as CCA busy and PDCCH / EPDCCH reception failure.

PUSCH transmissions with A-CSI reporting (and / or A / N reporting) in the supposed UCI transmission timing subframe n are scheduled in SCell # 2 and additionally A / N reporting requests are sent from another serving cell (SCell # 1) If the PUSCH transmission by the UL grant is scheduled to the UE by the BS, the UE transmits a PUSCH transmission 875 having an A-CSI (and / or A / N reporting) report in subframe n of SCell # 2, (A / N, A-CSI, etc.) information for the corresponding serving cells in the UCI serving cell group # 0 through the PUSCH transmission 855 having the A / N report on the serving cell group # 0.

It should be noted that, as a method in the frequency domain view, as in the method 2-3, A / N reporting is performed in each UL grant designating transmission of each PUSCH in a plurality of unlicensed serving cells of the same subframe. (UCI) for the serving cells in the UCI group to be transmitted in the PUSCH transmission subframe should be repeated (same) with each PUSCH transmission in case that the PUSCH transmission request and / or the A-CSI report request is included do. In this case, the LAA UE can expect to receive a plurality of A-CSI report requests and A / N report requests through a plurality of serving cells in the same subframe in one UCI serving cell group.

In order to perform the above proposed method, in particular, the A-CSI report request indication must be received by the UE in the same A-CSI report triggering indication and setting in the plurality of UL grants. If it is not the same, the UE may ignore the request in the case of an error or perform an A-CSI report by applying only one selected request.

The time domain view is described below. If the PUSCH transmission having the A / N reporting and the A-CSI report can not occupy the channel due to the CCA busy (LBT failure) as the UCI transmission method in the time domain view as in the method 2-2, Considering Method 2-2 and Method 2-3, it may provide an additional opportunity to transmit the corresponding UCI information in the subsequent subframe (s).

The definition of the above-mentioned subframe means the subframes which can be PUSCH-transmitted within a certain period as already described in method 2-2, which is a serving cell as the initial PUSCH transmission 875, , 877, 878) or it may be another serving cell and then another (if any) subframe. For example, if a UE receives a UL grant (PDCCH / EPDCCH) indicating a PUSCH transmission in a plurality of subframes, the TBs transmitted through the PUSCH in each subframe (different HARQ process IDs) The same UCI information may be repeatedly or delayed (Delayed) in at least some or all of the subframes (875, 876, 877, 878) of the subframes after the UCI transmission timing. Therefore, even if the PUSCH transmission of subframe n in SCell # 2 is not performed due to CCA busy, it can not be transmitted due to CCA busy even in the PUSCH transmission (s) in another subframe after being scheduled through the same or another UL grant The same UCI information as the UCI can be transmitted. In addition, the number of UL subframes (N) that can be scheduled through one UL grant can be set by an upper layer, and PUSCH transmission is performed in K subframes (K <= N) according to UL grant scheduling information Can be instructed. Also, as already mentioned above, the UCI can be transmitted in all K subframes or in some subframes through the PUSCH. The number of UCI transmission subframes (T, T < = K) may be indicated via an UL grant. In the SCell # 2 (UB) in FIG. 8B, the value of K may be 4 and the value of T may be equal to or smaller than 4. Or if the UCI transmission is delayed after a subframe corresponding to the unsuccessful subframe z due to the CCA busy and there is a PUSCH transmission, the corresponding UCI can be transmitted through the PUSCH transmission thereafter.

In another embodiment, the BS may share a Maximum Channel Occupancy Time (MCOT) acquired through the DL Cat 4 LBT to the UE. The base station transmits the data to the Cat. 4 LBT to acquire the channel for 6 ms and then use the DL subframe corresponding to the first 2 ms for DL transmission including UL grant transmission and then have a time gap (eg 25 us) of at least a certain time after the DL transmission (Eg, 6 ms (MCOT) - 2 ms (for DL) = 4 ms) of the MCOT time acquired by the base station after the UL transmission of the UE is shared by the UE, and the UE performs the CCA for only 25 us The UL transmission can be performed within the MCOT time. In this case, the proposed method can be applied to UCI transmission by the terminal.

For example, the base station can instruct the UE to transmit a plurality of UL scheduling information through one PDCCH / EPDCCH transmission in one DL subframe. Such scheduling information may indicate PUSCH transmission and UCI transmission in subframes 890, 892, 893 and 895. [ Therefore, the same (or delayed) UCI transmission may be performed with PUSCH transmission in some or all of the above subframes in the MCOT.

The proposed time domain method and the frequency domain method can be selectively used by an indicator in the DCI (eg, an A-CSI report request field, an A / N report request field) by a scheduling strategy of the base station, The CSI report request may be applied by the proposed method for the purpose of triggering A-CSI reporting in one grant rather than multiple (same as before). Also, one or both of the above methods may be optionally directed to the terminal by RRC configuration.

In Case 2, if the UE is not configured with a UCI serving cell group and if the UCI to be transmitted in one PUCCH serving cell group in a particular subframe consists of A / N, SR and A-CSI reporting, If there is no PUSCH transmission in the cell, at least the A / N for the licensed serving cell and the SR are transmitted through the PUCCH of the licensed serving cell. Otherwise, if there is a PUSCH transmission in the licensed serving cell PCell, Is sent over the SCell with the lowest SCell index. Additionally, if the PUSCH transmission with the A-CSI report is on the licensed serving cell, A / N, SR and A-CSI for the licensed serving cell may be transmitted through the serving cell that performs the PUSCH transmission. If the PUSCH transmission is not in the same subframe because the UCI serving cell group is not set, the A / N corresponding to the license-exempt serving cell is transmitted through the PUCCH of the PCESC / PSCell serving as the license serving cell. If the PUSCH is transmitted to the PCell / PSCell If there is a PUSCH transmission in the SCell, it is transmitted in a serving cell having the smallest SCell index or in a serving cell having the smallest SCell index among the SCells in the unlicensed serving cell . The A-CSI report is transmitted through the PUSCH transmission serving cell with the A-CSI report.

9A to 9D are views for explaining another example of the A-CSI reporting method according to Case 2 in the first embodiment of the present invention. This is the case where the terminal fails the CCA and there is a report of A-CSI and an A / N transmission.

9A to 9D, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S900). The base station transmits the uplink grant G for the PUSCH of the U-SCell # 2 to the UE through the L-SCELL # 1 (S905). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the set of CSI processes corresponding to the A-CSI trigger by the CSI request of the UL grant of S905 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the U-SCELL # 2. The UE can expect to transmit the PUSCH on U-SCell # 2 of a specific subframe (for example, after 4 subframes), in accordance with the instruction of the UL grant.

<Method 2-4>

Method 2-4 will be described with reference to FIG. 9A.

As an example, if the PUSCH transmission in the subframe indicated by the uplink grant becomes impossible due to the occupation failure of the U-SCell # 2 (S910), the UE drops the A-CSI triggered by the CSI request of the uplink grant (S915), and transmits A / N. At this time, the terminal transmits the A / N through the PUCCH of the main serving cell (S920) or transmits the PUCCH through the set secondary serving cell (PUCCH SCell) (S925).

As another example, if the PUSCH transmission in the subframe indicated by the uplink grant becomes impossible due to the occupation failure of the U-SCell # 2 (S910), the terminal transmits only the A-CSI triggered by the CSI request of the uplink grant I also drop all A / N.

<Method 2-5>

Method 2-5 will be described with reference to FIG. 9B.

As an example, the PUSCH transmission in the subframe indicated by the uplink grant becomes impossible due to the occupation failure of the U-SCell # 2 (S910), and the uplink transmission (PUSCH) (S930), the UE drops the A-CSI triggered by the CSI request of the UL grant (S935), and transmits A / N (or A / N and SR). At this time, the UE transmits the A / N (or A / N and SR) through the PUCCH of the main serving cell (S940) or transmits the PUCCH through the PUCCH SCell (S945) The A / N is transmitted through the PUCCH sub-serving cell when the serving cell in which the scheduled PUSCH is transmitted is included in the PUCCH sub-serving cell group. Otherwise, if the PUCCH secondary serving cell is not set or the serving cell to which the scheduled PUSCH is transmitted belongs to the serving cell group including the PCcell, the A / N is transmitted via the PCUC's PUCCH.

As another example, if the PUSCH transmission in the subframe indicated by the uplink grant becomes impossible due to the occupation failure of U-SCell # 2 (S910) and the uplink transmission (PUSCH) (S930), the UE drops both the A / N (or A / N and SR) as well as the A-CSI triggered by the CSI request of the UL grant.

<Method 2-6>

Methods 2-6 are described with reference to Figures 9c and 9d.

According to the method 2-6, although the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the occupation failure of the U-SCell # 2 (S910), the PUSCH in at least one other serving cell on the same subframe If the transmission is scheduled, the UE can transmit the A-CSI or the like to the BS through the another serving cell (S955).

Specifically, if the UE fails the CCA for the PUSCH transmission of the U-SCell # 2 (S910) and the PUSCH transmission is scheduled in at least one other serving cell on the same subframe (S950 or S975) CSI, etc. to the base station through the other serving cell (S960, S965, S970, S985, S990, S995, S997). At this time, a rule for selecting another serving cell for transmission such as A-CSI is as follows. Here, some rules can be further subdivided in consideration of whether or not the SR is transmitted.

a. When the other serving cell includes the main serving cell or the PUCCH SCell

In one aspect (Alt 1), i) if the PUSCH transmission is scheduled in the main serving cell or the PUCCH SCell among at least one other serving cell of the same subframe, the UE transmits A-CSI on the PUSCH of the main serving cell or PUCCH SCell And A / N are all transmitted (S960 or S965). If the transmission of the SR in the same subframe is additionally scheduled, the terminal transmits the A-CSI to the base station on the PUSCH of the main serving cell or the PUCCH SCell (S985 or S990) Or the PUCCH of the PUCCH SCELL to the base station (S997).

In another aspect (Alt 2), if the PUSCH transmission is scheduled in the main serving cell or the PUCCH SCell of at least one other serving cell of the same subframe, the terminal transmits the A-CSI to the base station (S985 or S990) and transmits A / N (or A / N and SR) to the base station on the PUCCH of the main serving cell or the PUCCH SCell (S997).

b. If another serving cell includes a SCELL whose PUSCH transmission is scheduled

In one aspect (Alt 1), i) if the PUSCH transmission is scheduled in the main serving cell of at least one other serving cell of the same subframe and the PUSCH transmission is scheduled in at least one serving cell, Regardless of whether the secondary serving cell belongs to the LB or the UB, the UE transmits all A-CSI and A / N to the base station through the PUSCH on the selected secondary serving cell based on the index. Here, the selected serving cell may have the lowest index among the at least one serving cell (S970). Alternatively, the selected serving cell may have the highest index among the at least one serving cell (S965). And ii) if the transmission of the SR in the same subframe is additionally scheduled, the terminal transmits A-CSI to the base station through the PUSCH on the selected serving cell based on the index (S990) To the base station on the PUCCH of the serving cell or the PUCCH SCell (S997).

In another aspect (Alt 2), if the PUSCH transmission is scheduled in the main serving cell of at least one other serving cell of the same subframe and the PUSCH transmission is scheduled in at least one serving cell, The A-CSI is transmitted to the base station through the PUSCH on the selected serving cell (S990), and the A / N (or A / N and SR) is transmitted to the base station on the PUCCH of the main serving cell or PUCCH SCell.

c. If another serving cell includes a scheduled SCELL in which the PUSCH transmission in the LB or UB is scheduled

In one aspect (Alt 1), i) if the PUSCH transmission is scheduled in the main serving cell of the same subframe but the PUSCH transmission is scheduled in at least one other secondary serving cell included in the LB, A-CSI and A / N can all be transmitted through the PUSCH of the secondary serving cell corresponding to the lowest L-SCell index among the secondary serving cells (S965). And ii) if the PUSCH is not included in the LB and the PUSCH transmission is scheduled in the serving cell of the UB, the UE transmits the PUSCH in the UB to the lowest index of the scheduled serving cells Both A-CSI and A / N can be transmitted through the PUSCH of the corresponding secondary serving cell (S970). And iii) if the transmission of the SR in the same subframe is additionally scheduled, the UE transmits A-CSI to the base station through the PUSCH of the selected serving cell in step i) or ii) (S990), and transmits the main serving cell or PUCCH SCell And transmits the A / N and the SR to the base station (S997).

In another aspect (Alt 2), i) if the PUSCH transmission is scheduled in the main serving cell of the same subframe but the PUSCH transmission is scheduled in at least one other secondary serving cell included in the LB, (Or A / N and / or SR) to the primary serving cell or the serving cell, or to the serving cell, or to the serving cell, through the PUSCH of the secondary serving cell corresponding to the lowest L- PUCCH SCELL to the base station (S997). And ii) if the PUSCH is not included in the LB and the PUSCH transmission is scheduled in the serving cell of the UB, the UE transmits the PUSCH in the UB to the lowest index of the scheduled serving cells (Or A / N and SR) to the base station through the main serving cell or the PUCCH SCell (S997). The A-CSI is transmitted to the base station through the PUSCH of the corresponding secondary serving cell.

Among the detailed embodiments of the rules proposed in the method 2-6, the rules of the embodiment corresponding to Alt 1 have a common point that the terminal transmits the A-CSI report and the A / N in one PUSCH (selected). The advantage of Alt 1 is that in the environment in which (E) PDCCH is used, the implicit resource allocation scheme (PUCCH resource is reserved based on (E) CCE ((Enhanced) Control Channel Element) index value to which PDCCH is allocated) An explicit resource allocation scheme (a set of a plurality of PUCCH resources is set by upper layer signaling and the TPC field in the (E) PDCCH transmitted on the serving cell is reused to indicate one set of the plurality of sets, Reserved) is applied, the base station can efficiently utilize the PUCCH resources.

Also, if possible, fewer channels are transmitted in the same subframe and are effective in power allocation for transmission of the corresponding channel. For example, if the PUCCH and the PUSCH are transmitted in the same subframe, the power required for the PUCCH is allocated first and then the PUSCH is allocated by the uplink power control method in the carrier aggregation, so that the power for the uplink transmission In a limited situation, the power for PUSCH transmission may be scaled down. This situation can adversely affect uplink coverage of the UE.

Alt 2, on the other hand, has the advantage of leading to a simpler implementation compared to Alt 1 because there is no need to define additional operations depending on the presence or absence of PUSCH transmission for A-CSI reporting. This is because A / N transmission is always fixed to PUCCH.

Hereinafter, the method of reporting the A-CSI according to the second embodiment and each case will be described in detail. The second embodiment restricts the A-CSI and the A / N to be transmitted through PUCCH or PUCCH or PUCCH / PUSCH (if the UE is set to simultaneous PUCCH and PUSCH transmission) only in the serving cells included in the LB . That is, the UE expects to perform uplink scheduling for A-CSI and A / N transmission only in the serving cell in the LB, thereby piggybacking A-CSI and A / N on the PUSCH transmission on the LB.

The second embodiment includes Case 1 and Case 2, and the criterion for dividing Case 1 and Case 2 is whether PUSCH and PUCCH are simultaneously transmitted to the UE. If simultaneous transmission is not set, the terminal performs the operation of Case 1, and if simultaneous transmission is set, the terminal performs the operation of Case 2.

3. Second Embodiment: Case 1

10 is a view for explaining an example of the A-CSI reporting method according to Case 1 in the second embodiment of the present invention.

Referring to FIG. 10, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S1000). The base station transmits the uplink grant G for the PUSCH of the L-SCELL # 1 to the UE through the L-SCELL # 1 (S1005). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the set of serving cells or the set of CSI processes corresponding to the A-CSI trigger by the CSI request of the UL grant of S1005 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the L-SCELL # 1. The UE expects to transmit a PUSCH on L-SCell # 1 of a specific subframe (for example, after 4 subframes) according to an instruction of the UL grant, and the serving cells U-SCell # 2, U -SCell # 3 does not expect to transmit A-CSI or the like (S1010). This is true even if the CCA for U-SCell # 2 and U-SCell # 3 succeeds.

The terminal transmits A-CSI or the like to the base station through the PUSCH of the L-SCELL # 1 (S1015). As an example, if only transmission of A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the terminal transmits A-CSI to the base station via the PUSCH on L-SCELL # 1. As another example, if both the A-CSI and the A / N transmission are triggered in the scheduled subframe, the terminal transmits the A-CSI and the A / N to the base station through the PUSCH on the L-SCELL # 1.

4. Second Embodiment: Case 2

11 is a view for explaining an example of the A-CSI reporting method according to Case 2 in the second embodiment of the present invention.

Referring to FIG. 11, LB includes L-PCell and L-SCell # 1, and UB includes U-SCell # 2, U-SCell # 3, and U-SCell # 4. The base station transmits the PDSCH to the UE through the L-PCell and U-SCell # 2, respectively (S1100). The base station transmits an uplink grant G for the PUSCH of the L-SCELL # 1 to the terminal (S1105). The uplink grant includes a CSI request, and in this example, the CSI request value is assumed to be 10 (Trigger 10). The contents indicated by the CSI request value (Trigger 10) are a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, in this example L-PCell, L-SCell # 1, U-SCell # 2, and U-SCell # 3. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the UL grant in S1105 is L-PCell, L-SCell # 1, U-SCell # 2 and U-SCell # 3. Meanwhile, the uplink grant includes scheduling information for the PUSCH of the L-SCELL # 1. The UE expects to transmit a PUSCH on L-SCell # 1 of a specific subframe (for example, after 4 subframes) according to an instruction of the UL grant, and the serving cells U-SCell # 2, U -SCell # 3 does not expect to transmit A-CSI or the like (S1110). This is true even if the CCA for U-SCell # 2 and U-SCell # 3 succeeds.

The MS transmits A-CSI or the like to the BS through the PUSCH of the L-SCell # 1 and the PUCCH of the main serving cell (or PUCCH SCell) (S1115). As an example, if only transmission of A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the terminal transmits A-CSI to the base station via the PUSCH on L-SCELL # 1. As another example, if the PUSCH transmission is triggered in both the A-CSI and the A / N (or A / N and SR) transmission in the scheduled subframe, the terminal transmits the A-CSI via the PUSCH on the L- And transmits A / N (or A / N and SR) to the base station through the PUCCH of the main serving cell or the PUCCH SCell.

12 is a block diagram illustrating a terminal and a base station according to an embodiment.

Referring to FIG. 12, a terminal 1200 and a base station 1250 perform an A-CSI reporting and an A / N transmission operation as disclosed herein.

The terminal 1200 includes a processor 1210, an RF unit 1220, and a memory 1225.

Processor 1210 implements the functions, processes and / or methods suggested herein. Specifically, the processor 1210 implements all of the operations of the terminal described in the embodiment of FIG. 3 published herein, and includes generation and control operations such as A-CSI, A / N, SR, etc. according to FIGS. . The memory 1225 is coupled to the processor 1210 to store various information for driving the processor 1210.

RF section 1220 is coupled to processor 1210 to transmit and / or receive wireless signals. For example, RF section 1220 may transmit A-CSI, A / N, SR to base station 1250, or receive an uplink grant and PDSCH including a CSI request from base station 1250. More specifically, the RF unit 1220 receives an UL grant for instructing transmission of a PUSCH of a UB serving cell (serving cell or CC belonging to the license-exempt band) from the BS 1250. Herein, the uplink grant is downlink control information transmitted from the base station 1250 to the terminal 1200, and the uplink grant is DCI format 0 or 4, and may include a CSI request. The RF unit 1220 may transmit the A-CSI and A / N signals on the PUSCH at the same time, or may divide the PUSCH and the PUCCH and transmit the A-CSI and the PUCCH based on whether the PUSCH and the PUCCH are set to be simultaneously transmitted.

The CSI request has a size of 1 or 2 bits. (E) when a plurality of serving cells are configured in the UE 1200 and the PDCCH transmission (E) carrying the uplink grant is transmitted on the UE-specific search space or a plurality of CSI processes are configured in the UE and the uplink grant is transmitted If the PDCCH transmission is sent on the UE-specific search space, the CSI request has 2 bits, otherwise the CSI request is 1 bit. The UE 1200 does not expect to receive an uplink grant from the base station that includes more than one A-CSI request in one serving cell group in one subframe. In the case where the CSI request is 2 bits, the content indicated by the CSI request may differ according to the number of serving cells and the transmission mode (TM) and / or the CSI subframe pattern setting of each serving cell, Specific examples of the instruction can be found in Tables 1, 2 and 4. The uplink grant also includes scheduling information for the PUSCH of the UB serving cell. The UE 1200 may expect to transmit a PUSCH on the UB serving cell of the current subframe according to an instruction of the UL grant.

The processor 1210 may include a CSI reporting controller 1212 and a HARQ controller 1214. The operations of the CSI reporting controller 1212 and the HARQ controller 1214 all belong to the operation of the processor 1210.

The CSI reporting control unit 1212 decodes and analyzes the uplink grant, the PDSCH, and the like in the RF unit 1220, and controls the A-CSI reporting procedure accordingly.

When the RF unit 1220 receives the uplink grant indicating the PUSCH (uplink transmission) in the serving cell of the UB, the CSI reporting control unit 1212 confirms the CSI request included in the uplink grant, The CSI report transmission is prepared according to a predetermined condition. Here, the predetermined condition may mean the conditions according to Tables 1, 2 and 4 and the description thereof.

For example, the CSI reporting controller 1212 may first determine a predetermined condition for preparing the CSI report transmission, then determine a predetermined condition for transmitting the A-CSI, etc., and first determine a predetermined condition for transmitting the A-CSI A predetermined condition for preparing the CSI report transmission may be determined. In this specification, the CSI reporting control unit 1212 first determines a predetermined condition for transmitting an A-CSI and then determines a predetermined condition for preparing a CSI report transmission. However, the technical idea of the present invention is limited to this no.

According to the first embodiment of the present invention, the CSI reporting control unit 1212 determines whether the PUSCH and PUCCH simultaneous transmission are established.

i) When simultaneous transmission is not set (Case 1)

If simultaneous transmission is not set, the CSI reporting control unit 1212 performs the operation of Case 1 of the first embodiment. For example, when PUSCH and PUCCH simultaneous transmission are not set, the CSI reporting control unit 1212 notifies the CSI reporting control unit 1212 of the current subframe and UB serving cell (UB serving cell of a specific subframe in which the PUSCH is scheduled to be transmitted according to the uplink grant) (E) Determine if CCA is successful.

If the (E) CCA for the UB serving cell is successful, the CSI reporting controller 1212 prepares the report transmission of the A-CSI according to a predetermined condition, and the RF unit 1220 transmits the A-CSI etc. to the UB serving cell To the base station 1250 via the PUSCH on the uplink.

For example, when the CSI reporting control unit 1212 prepares only the A-CSI report transmission in the scheduled subframe, the RF unit 1220 transmits the A-CSI to the base station 1250 via the PUSCH on the UB serving cell do.

As another example, when the CSI reporting controller 1212 prepares to transmit the A-CSI report in the PUSCH transmission in the scheduled subframe and the HARQ controller 1214 prepares to transmit A / N, the RF unit 1220 transmits A CSI and A / N to the base station 1250 over the PUSCH on the UB serving cell.

If the (E) CCA is not successful, the CSI reporting controller 1212 prepares to transmit reports such as A-CSI, etc. through frequency resources different from other time resources on the UB serving cell or UB serving cell. Here, another time resource may refer to another subframe within a predetermined time after the current subframe. Another frequency resource may be a serving cell in the UB or a serving cell in the LB different from the UB serving cell.

According to an aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to channel occupancy failure, if the CSI reporting controller 1212 determines that the uplink grant is valid for a predetermined time t, CSI requests within the grant are also valid. Accordingly, when the CCA for the UB serving cell succeeds within a certain time t, the CSI reporting controller 1212 prepares to transmit the A-CSI report through the UB serving cell. Regarding the predetermined time, the CSI reporting controller 1212 may start the predetermined time when the PUSCH transmission fails due to a channel occupation failure in the UB serving cell.

According to another aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is not possible due to the occupancy failure of the existing UB serving cell, if the PUSCH transmission is scheduled in at least one other serving cell on the same subframe The CSI reporting control unit 1212 can prepare for the A-CSI report transmission.

A specific exemplary operation of the CSI reporting control unit 1212 according to Case 1 of the first embodiment may include operations of the terminal described in FIGS. 4 to 6B.

ii) When simultaneous transmission is set (Case 2)

If simultaneous transmission is set, the CSI reporting controller 1212 can perform the operation of Case 2 of the first embodiment. For example, when the PUSCH and PUCCH simultaneous transmission are set, the CSI reporting control unit 1212 determines whether the PUSCH and the PUCCH are simultaneously transmitted in the current subframe and in the UB serving cell (UB serving cell of a specific subframe in which PUSCH transmission is scheduled according to the uplink grant) ) Determine if CCA is successful. If the (E) CCA for the UB serving cell is successful, the CSI reporting controller 1212 prepares the report transmission of the A-CSI according to a predetermined condition, and the RF unit 1220 transmits the A-CSI to the UB serving cell To the base station 1250 via the PUSCH. At this time, if the A / N transmission is triggered together, the RF unit 1220 transmits the A / N to the base station 1250 through the PUCCH.

As an example, if only the transmission of A-CSI is triggered in the PUSCH transmission scheduled subframe, the RF unit 1220 transmits A-CSI to the base station 1250 via the PUSCH on the UB serving cell. As another example, if A-CSI reporting and A / N transmission are triggered in a PUSCH transmission scheduled subframe, RF section 1220 transmits A-CSI to PUSCH on UB serving cell to base station 1250 And transmits the A / N to the base station 1250 via the PUCCH of the main serving cell or the PUCCH SCell.

If the CCA is not successful, the CSI reporting controller 1212 prepares to transmit the A-CSI report over a frequency resource other than the time resource or the UB serving cell on the UB serving cell.

According to an aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the channel occupancy failure, if the CSI reporting controller 1212 determines that the uplink grant is valid for a predetermined time t, The CSI request in the uplink grant is also valid. Accordingly, the CSI reporting controller 1212 can prepare for the A-CSI report transmission through the UB serving cell if the CCA for the UB serving cell succeeds within a predetermined time t.

According to another aspect of the present invention, even if the PUSCH transmission in the subframe indicated by the uplink grant is not possible due to the occupancy failure of the existing UB serving cell, if the PUSCH transmission is scheduled in at least one other serving cell on the same subframe The CSI reporting controller 1212 can prepare to transmit the A-CSI report through the other serving cell. At this time, the CSI reporting controller 1212 can select the serving cell in the different serving cell or the license band based on the priority determined by the index of each serving cell.

A specific exemplary operation of the CSI reporting control unit 1212 according to Case 2 of the first embodiment may include operations of the terminal described in FIGS. 7 to 9D.

The HARQ controller 1214 generates a HARQ ACK or HARQ NACK as a decoding result for the PDSCH received from the base station 1250 and sends the generated HARQ ACK or HARQ NACK to the RF unit 1220 and the CSI reporting controller 1212.

Meanwhile, according to the second embodiment of the present invention, the CSI reporting control unit 1212 determines whether the PUSCH and PUCCH simultaneous transmission are set.

i) When simultaneous transmission is not set (Case 1)

According to Case 1 of the second embodiment of the present invention, the UE 1200 restricts the A-CSI and the A / N to be transmitted through the PUSCH only in the serving cells included in the LB. That is, the UE 1200 expects to perform uplink scheduling for A-CSI and A / N transmission only in the serving cell in the LB, thereby piggybacking A-CSI and A / N on the PUSCH transmission on the LB. In other words, the terminal 1200 does not expect to transmit A-CSI or the like in the serving cells included in the UB. This is true even if (E) CCA succeeds in the serving cell included in the UB.

Accordingly, the CSI reporting controller 1212 transmits A-CSI or the like to the base station through the PUSCH of the serving cell on the LB (S1015). The PUSCH is scheduled by the UL grant transmitted from the BS 1250. As an example, if only the transmission of A-CSI is triggered in the subframe where the PUSCH transmission is scheduled, the RF unit 1220 transmits the A-CSI to the base station 1250 via the PUSCH on the serving cell of the LB. As another example, if A-CSI reporting is triggered in a PUSCH transmission scheduled subframe and A / N transmission is triggered in the same subframe, the RF unit 1220 transmits A-CSI and A / To the base station 1250 through the PUSCH on the cell.

ii) When simultaneous transmission is set (Case 2)

According to Case 2 of the second embodiment of the present invention, the UE 1200 restricts the A-CSI and the A / N to be transmitted through the PUCCH or the PUSCH only in the serving cells included in the LB. That is, the UE 1200 expects uplink scheduling for A-CSI and A / N transmission to be performed only in the serving cell in the LB, and accordingly piggybacks A-CSI or A / N on the PUSCH or PUCCH transmission on the LB do. In other words, the UE 1200 does not expect to transmit A-CSI and A / N in the serving cells included in the UB. This is true even if (E) CCA succeeds in the serving cell included in the UB.

Accordingly, the CSI reporting controller 1212 transmits A-CSI or the like to the base station through the PUSCH of the serving cell in the LB and the PUCCH of the main serving cell (or PUCCH SCell). As an example, when only the transmission of A-CSI is triggered in the subframe in which the PUSCH transmission is scheduled, the RF unit 1220 transmits the A-CSI to the base station 1250 via the PUSCH on the LB. As another example, if A-CSI reporting is triggered in a PUSCH transmission scheduled subframe and transmission of A / N (or A / N and SR) is triggered in the same subframe, CSI to the BS 1250 over the PUSCH on the LB and transmits the A / N (or A / N and SR) to the BS 1250 through the PUCCH of the main serving cell or PUCCH SCell.

Base station 1250 includes a memory 1255, a processor 1260, and an RF section 1265.

Processor 1260 implements the functions, processes, and / or methods suggested herein. Specifically, the processor 1260 implements the operation of the base station corresponding to all the operations of the terminal 1200 described in the embodiments of Figs. 3 to 10, which are published herein. The memory 1255 is coupled to the processor 1260 to store various information for driving the processor 1260. RF section 1265 is coupled to processor 1260 to transmit and / or receive wireless signals. For example, the RF unit 1265 may receive the A-CSI, the A / N, and the SR from the terminal 1200, or may transmit the uplink grant and the PDSCH including the CSI request to the terminal 1200. More specifically, the RF unit 1265 transmits an uplink grant (UL grant) for the PUSCH of a UB serving cell (serving cell or CC belonging to the license-exempt band) to the terminal 1200. Herein, the uplink grant is downlink control information transmitted from the base station 1250 to the terminal 1200, and the uplink grant is DCI format 0 or 4, and may include a CSI request.

The processor 1260 recognizes that the A-CSI transmission in the resource scheduled to the terminal 1200 via blind decoding has failed. The RF unit 1265 can receive the A-CSI report from the terminal 1200 using the PUSCH (if any) on the already promised other serving cell and the processor 1260 can receive the A- To perform downlink scheduling for the terminal 1200. [

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

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

Claims (8)

A terminal for transmitting uplink control information in a wireless communication system supporting carrier aggregation,
It is determined whether simultaneous transmission of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) is established, and whether or not the simultaneous transmission of an unlicensed band (UB) (A-CSI) report through another frequency resource of the first serving cell or a frequency resource different from that of the first serving cell when the serving cell fails to occupy the channel A processor;
Wherein the A-CSI and the HARQ ACK / NACK signals are received from the base station on the PUSCH based on whether the PUSCH and the PUCCH are concurrently transmitted or not, based on scheduling of the PUSCH and an A- A radio frequency unit for transmitting the PUSCH and the PUCCH; And
And a memory coupled to the processor and storing information for driving the processor. The method according to claim 1,
Wherein the other time resource is another subframe within a predetermined time after the current subframe,
Wherein the processor starts the predetermined time when the PUSCH transmission fails due to a channel occupation failure in the first serving cell. The method according to claim 1,
Wherein the different frequency resource is a serving cell or a serving cell in a licensed band (LB) different from the first serving cell in the UB. The method of claim 3,
Wherein the processor selects a serving cell in the different serving cell or the licensed band based on a priority determined by an index of each serving cell. A method for transmitting uplink control information by a terminal in a wireless communication system supporting carrier aggregation,
Determining whether simultaneous transmission of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) is established;
Receiving an uplink grant for scheduling the PUSCH and requesting the A-CSI report from a base station;
If the first serving cell fails to occupy the channel of the first serving cell in the unlicensed band (UB) in the current subframe, the non-periodic channel state information through the frequency resource different from the other time resources of the first serving cell or the first serving cell (A-CSI) report ready for transmission; And
And transmitting the A-CSI and the HARQ ACK / NACK signal on the PUSCH at a time based on whether the PUSCH and the PUCCH are set to be simultaneously transmitted, or dividing the PUSCH and the PUCCH. 6. The method of claim 5,
Wherein the other time resource is another subframe within a predetermined time after the current subframe,
Wherein the predetermined time starts when the PUSCH transmission fails due to a channel occupancy failure in the first serving cell. 6. The method of claim 5,
Wherein the different frequency resource is a serving cell or a serving cell in a licensed band (LB) different from the first serving cell in the UB. 8. The method of claim 7,
Wherein the serving cell in the other serving cell or the licensed band is selected based on the priority determined by the index of each serving cell.

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