WO2016186370A1

WO2016186370A1 - Apparatus and method for transmitting or receiving uplink control information in wireless communication system supporting carrier aggregation

Info

Publication number: WO2016186370A1
Application number: PCT/KR2016/004962
Authority: WO
Inventors: 박동현
Original assignee: 주식회사 아이티엘
Priority date: 2015-05-15
Filing date: 2016-05-12
Publication date: 2016-11-24

Abstract

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. The present specification discloses a terminal comprising: a processor which determines whether simultaneous transmission of a PUSCH and a PUCCH has been configured and, when failing to occupy a channel of a first serving cell within an unlicensed-band (UB) in a current sub-frame, prepares A-CSI report transmission through another time resource of the first serving cell or a frequency resource different from that of the first serving cell; an RF unit which receives an uplink grant scheduling the PUSCH and requesting for the A-CSI report, transmits the A-CSI and an HARQ ACK/NACK signal together on the PUSCH or divisionally on the PUSCH and the PUCCH, on the basis of whether the simultaneous transmission of the PUSCH and the PUCCH has been configured; and a memory which is connected to the processor and stores information for driving the processor.

Description

Apparatus and method for transmitting or receiving uplink control information in a wireless communication system supporting carrier aggregation

The present invention relates 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 aggregation.

Carrier Aggregation (CA) supports a plurality of carriers and is also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CC). Each component carrier is defined by a bandwidth and a center frequency. Using CA, it is possible to combine a plurality of bands that are physically continuous or non-continuous in the frequency domain, such as to use a logically large band.

However, with the recent surge in wireless communication traffic, securing more frequencies is still an urgent problem. Accordingly, a method of performing CA using not only a licensed band (LB) but also an unlicensed band (UB) that is exclusively allocated to a mobile communication provider is being discussed. The Long Term Evolution (LTE) standard uses a system information (SI) to set carriers on an unlicensed band as a secondary serving cell (SCell), while serving a primary serving cell (PCell) on a licensed band. Or, we are considering the introduction of Licensed Assisted Access (LAA) that configures at least one secondary serving cell.

Due to the nature of LAA, different communication systems have a constraint that they must occupy frequency resources evenly. Accordingly, the serving cells of the unlicensed band are occupied by a user equipment (UE) or a base station (BS or eNB) by an opportunistic method to transmit and receive data and signals. For example, one LAA node (e.g., base station or terminal) checks if a carrier in an unlicensed band is occupied by another LAA node or another communication system (e.g. WiFi), and if the carrier in that unlicensed band is empty Communication can be performed by occupying the channel of the carrier. This series of actions is called List Before Talk (LBT).

In the wireless communication system, aperiodic channel state information (CSI) reporting is required for the base station to efficiently perform downlink scheduling to the terminal. However, when a LAA node (for example, a base station or a terminal) performs communication using carriers in an unlicensed band, CSI reporting in the unlicensed band is uncertain because occupancy of the unlicensed band is not always guaranteed. In other words, when the carrier in the unlicensed band loses the occupancy of the carrier at the timing when the CSI report is to be performed, it is not determined how to perform the CSI report. In this case, errors in data transmission and reception and degradation of performance may be accompanied by ambiguity in transmission of the CSI report. Therefore, a method for effectively performing CSI reporting in a LAA based wireless communication system is needed.

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

Another technical problem of the present invention is 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.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to an aspect of the present invention, a terminal for transmitting uplink control information in a wireless communication system supporting carrier aggregation is provided. The UE determines whether simultaneous transmission of the PUSCH and the PUCCH is set, and when the channel occupancy of the first serving cell in the unlicensed band (UB) fails in the current subframe, another time resource of the first serving cell or the first serving cell A processor preparing for transmission of an A-CSI report on a different frequency resource, receiving an uplink grant for scheduling the PUSCH and requesting the A-CSI report from a base station, and setting up simultaneous transmission of the PUSCH and the PUCCH Based on the RF unit for transmitting the A-CSI and HARQ ACK / NACK signal on the PUSCH at once or divided into the PUSCH and the PUCCH, and a memory connected to the processor to store information for driving the processor Include.

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 includes determining whether simultaneous transmission of a PUSCH and a PUCCH is set, receiving an uplink grant from a base station scheduling the PUSCH and requesting the A-CSI report; Preparing to transmit an A-CSI report through another time resource of the first serving cell or a different frequency resource than the first serving cell when the channel occupancy of the first serving cell in the UB fails in the current subframe; And transmitting the A-CSI and the HARQ ACK / NACK signals at once on the PUSCH or dividing the PUSCH and the PUCCH based on whether PUSCH and the PUCCH are simultaneously transmitted.

The features briefly summarized above with respect to the present invention are merely exemplary aspects of the detailed description of the invention that follows, and do not limit the scope of the invention.

If the UE fails to occupy channel during the Clear Channel Assessment (CCA) or Extended CCA (ECCA) for the unlicensed band for aperiodic CSI reporting, the transmission of the aperiodic CSI and HARQ-ACK / NACK is dropped or abandoned. Can be prevented. As a result, it is possible to provide an effective transmission of uplink control information to the base station to further improve downlink performance.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings appended hereto are for the purpose of providing an understanding of the present invention and for illustrating various embodiments of the present invention and for describing the principles of the present invention together with the description of the specification.

1 shows examples of a LAA deployment scenario to which the present invention is applied.

FIG. 2 illustrates embodiments according to whether or not A-CSI and HARQ ACK / NACK can be transmitted and received in a licensed band and an unlicensed band based on the present invention.

3 is an operation flowchart of a terminal according to the first embodiment of the present specification.

4 is a view for explaining an example of the A-CSI reporting method according to Case 1 of the first embodiment of the present specification.

5 is a view for explaining another example of the A-CSI reporting method according to Case 1 of the first embodiment of the present specification.

6A and 6B illustrate another example of an A-CSI reporting method according to Case 1 of the first embodiment of the present specification.

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 specification.

8A to 8C are diagrams illustrating another example of the A-CSI reporting method according to Case 2 of the first embodiment of the present specification.

9A to 9D illustrate another example of an A-CSI reporting method according to Case 2 of the first embodiment of the present specification.

FIG. 10 is a diagram illustrating an example of an A-CSI reporting method according to Case 1 of a second embodiment of the present specification.

FIG. 11 illustrates an example of an A-CSI reporting method according to Case 2 of a second embodiment of the present specification.

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

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings and examples. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

In addition, the present specification describes a wireless communication network, the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting or receiving a signal in a system (for example, a base station) that manages the wireless communication network, In the process of transmitting or receiving a signal in a terminal coupled to the corresponding wireless network. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.

The wireless communication system of the present specification 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. Each base station provides a communication service for a specific geographic area or frequency area and may be called a site. A site may be divided into a number of areas, which may be called sectors, and each sector may have a different cell ID.

A user equipment (UE) constituting a wireless communication system may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), and a wireless device. Other terms may be referred to as a device, a personal digital assistant, a wireless modem, a handheld device, and the like.

A base station constituting a wireless communication system generally refers to a station communicating with a terminal, and includes an evolved-nodeb (eNodeB), a base transceiver system (BTS), an access point, an femto base station, and a domestic base station. (Home eNodeB: HeNodeB), relay (relay), Remote Radio Head (Remote Radio Head (RRH)) may be called in other terms. The cell should be interpreted in a comprehensive sense indicating some areas covered by the base station, and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.

Terms used to describe embodiments of the present invention may be described by 3GPP LTE or LTE-Advanced (LTE-A) standard documents, except where specified to be used in other meanings. However, this is only for the economics and clarity of the description, it should be noted that embodiments of the present invention is not limited to being applied only to the system according to the 3GPP LTE or LTE-A or a subsequent standard.

In the following, downlink means a communication or communication path from a base station to a terminal, and uplink means a communication or communication path from a terminal to a base station. In downlink, a transmitter may be part of a base station and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station. Layers of a radio interface protocol between the terminal and the base station may 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 higher layer, a media access control (MAC) layer, through a transport channel. Data is transmitted through a transport channel between the MAC layer and the physical layer. Transport channels are classified according to how data is transmitted over the air interface. In addition, data is transmitted through a physical channel between different physical layers (that is, between a physical layer of a terminal and a base station). The physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes space generated by time, frequency, and a plurality of antennas as radio resources.

For example, a physical downlink control channel (PDCCH) of a physical channel informs a terminal of resource allocation of a PCH (Paging CHannel) and DL-SCH (DownLink Shared CHannel) and HARQ (Hybrid Automatic Repeat Request) information related to the DL-SCH, The terminal may carry an uplink scheduling grant informing of resource allocation of uplink transmission. Physical Uplink Shared Channel (PDSCH) carries DL-SCH including downlink data. In addition, the Physical Uplink Control CHannel (PUCCH) carries uplink control information such as HARQ ACK / NACK, scheduling request, and CQI for downlink transmission. In addition, the PUSCH (Physical Uplink Shared CHannel) carries a UL-SCH (Uplink Shared CHannel) including uplink data. If necessary according to the configuration and request of the base station, the PUSCH may include channel state information (CSI) information such as HARQ ACK / NACK and CQI.

Simple cell division of macro and micro cells is difficult to meet the growing demand for data services. Accordingly, a method of performing wireless communication using not only a licensed band (LB) but also frequencies of an unlicensed band (UB) such as a WiFi band has been discussed. In order to smoothly support wireless communication in the unlicensed band, wireless communication in the unlicensed band may be provided with the support of the communication scheme of the licensed band.

Hereinafter referred to as License Assisted Access (LAA) supports CA operation for one or more secondary serving cells operating in an unlicensed band or unlicensed spectrum based on the assistance of a primary serving cell operating in a licensed band or spectrum. A wireless communication scheme is shown. In other words, LAA is a technology that uses a licensed carrier (LC) of an LTE licensed band as an anchor and binds the licensed and unlicensed bands together using a CA. In this case, one of the serving cells in the licensed band is used as the main serving cell, and the serving cells in the unlicensed band may always be configured as secondary serving cells. In addition, the unlicensed band may be activated only through the CA and may not perform LTE communication alone. The UE accesses the network to the licensed band to use the service, and the base station may offload the traffic of the licensed band to the unlicensed band by combining the licensed band and the unlicensed band with a CA according to circumstances.

1 shows examples of a LAA deployment scenario 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, scenario 1 is a case where a macro cell using a frequency carrier (F1), which is a license carrier, and a small cell using F3, which is an unlicensed carrier, are connected by carrier aggregation (CA). In this case, the macro cell and the small cell may be non-co-located and connected to each other by an ideal backhaul. Scenario 2 is a case where the small cell # 1 using the licensed carrier F2 and the small cell # 2 using the unlicensed carrier F3 are connected by carrier aggregation in addition to the macro cell coverage. Scenario 3 is a case where there is a macro cell using a licensed carrier F1 and a small cell # 1, and the small cell # 1 and the small cell # 2 using an unlicensed carrier F3 are connected by carrier aggregation. Scenario 4 includes a macro cell using a licensed carrier F1, a small cell # 1 using a licensed carrier F2, and a small cell # 2 using an unlicensed carrier F3, and the small cell # 1 and the small cell # 2 are carriers. This is the case when connected in aggregate.

Since the LAA creates an opportunistic channel occupancy environment, the base station performs a procedure for obtaining an unlicensed carrier (UC) in an unlicensed band, which performs dynamic carrier selection (DCS) and LBT. This includes procedures and operations such as Clear Channel Assessment (CCA) or Extended CCA (ECA) (hereinafter referred to as (E) CCA) for determining channel occupancy status. The base station checks the occupancy state of the unlicensed frequency resource through the DCS and CCA, and if possible, occupies the corresponding resource for a predetermined time to transmit and receive radio data.

In the LAA based wireless communication system, channel state information (CSI) reporting is required for the base station to effectively perform downlink scheduling to the terminal. CSI reporting includes periodic CSI reporting and aperiodic CSI (A-CSI) reporting. The reason why A-CSI reporting is important in a LAA environment is as follows. i) The channel environment of the unlicensed band carriers can be very flexible depending on the occupancy method of the carrier and the presence of hidden nodes, compared to the licensed band carriers, and the length of time that the carrier can be continuously occupied is LAA. Because of the constraints of the fairness of occupancy between nodes (or different wireless communication systems) (e.g. maximum channel occupancy time is set to 4ms in Japan and 13ms in Europe), periodic CSI reporting allows the base station to provide sufficient channels from the terminal. The limited channel occupancy 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 UE can report to the base station at a time. iii) Since the CSI measurement should be performed within the channel occupancy period for the carrier (or channel) occupied by performing the LBT, the need for A-CSI reporting is greater. Usually, the A-CSI reporting indication by the base station is performed by the base station by the base station together with scheduling for uplink transmission by CSI request in DCI format 0/4 through PDCCH or Enhanced PDCCH (EPDCCH) (hereinafter, (E) PDCCH) transmission. Is requested.

As described above, although A-CSI reporting is important in a LAA-based wireless communication system, the occupancy of the unlicensed band is not always guaranteed (for example, according to the LBT execution), so that the subframe of the unlicensed band indicated by the base station In A-CSI request there is a possibility that can not be performed due to the possibility of channel occupancy failure for the uplink transmission of the terminal. In other words, when the A-CSI report (or A-CSI report and HARQ ACK / NACK (hereinafter referred to as A / N) transmission) is performed on a carrier of an unlicensed band, the occupancy of the unlicensed channel for uplink transmission of the UE is lost. However, there is no specific decision on how A-CSI reporting should be made. In this case, errors in data transmission and reception and degradation of performance may be followed by ambiguity of transmission of A-CSI report (or A-CSI report and A / N transmission) by the terminal. Therefore, a method for effectively performing CSI reporting in a LAA based wireless communication system is needed. The A / N transmission refers to A / N information for downlink data transmission (eg, a transport block (TB) transmitted through a PDSCH). If the above A / N information should also be transmitted in a subframe in which a PUSCH channel carrying A-CSI report is transmitted, a PUSCH having the same A-CSI and A / N information according to whether a simultaneous transmission of PUCCH and PUSCH of the UE is set. May be sent on.

2 is a diagram illustrating an embodiment according to whether or not A-CSI and A / N can be transmitted and received in a licensed band and an unlicensed band based on the present invention.

Referring to FIG. 2, for example, the licensed band LB 200 includes six component carriers (CCs) or serving cells (ie, CC 1, CC 2, CC 3, CC 4, CC 5, and CC 6) and is exempted from license. The bands UB and 220 show nine component carriers or serving cells (ie, CC7, CC8, CC9, CC10, CC11, CC12, CC13, CC14, CC15, and CC16).

In the present specification, an LAA is configured in a terminal (that is, at least one licensed band carrier (for example, a primary serving cell) and at least one licensed band including carrier configuration (multiple serving cells are configured) Assume)).

Throughout this specification, a first embodiment provides a method for transmitting A-CSI (i.e., if A-CSI and / or A / N transmission / reception is possible in both licensed band 200 and unlicensed band 220) (i.e. The first embodiment relates to an operation in which A-CSI and A / N can be transmitted in the primary serving cell or secondary serving cell of LB and also in the secondary serving cell of UB). Is a method of transmitting A-CSI when A-CSI and / or A / N transmission / reception is possible in the licensed band 200 but not in the unlicensed band 220 (that is, the second embodiment is A-CSI and A). Operation when / N is limited to be transmitted on PUCCH, or PUSCH, or PUCCH and PUSCH of LB serving cells only).

Meanwhile, each embodiment of the present specification is subdivided into Case 1 and Case 2 again, Case 1 is a case where simultaneous transmission of PUSCH and PUCCH is not configured in the terminal, and Case 2 is a case where simultaneous transmission of PUSCH and PUCCH is configured in the terminal to be. Hereinafter, the present disclosure discloses operations of a terminal and a base station for A-CSI and / or A / N transmission and its apparatus for each embodiment and each case within each embodiment.

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

In addition, a UCI serving cell group may be newly defined for efficient uplink control information (UCI) transmission of serving cells configured on LB and UB within one PUCCH serving cell group. The UCI serving cell group may correspond to "a sub-group within a PUCCH Cell group" within a PUCCH serving cell group, which is transmitted through RRC (Radio Resource Control) signaling to a user equipment by a base station. Can be set.

If the UCI serving cell group is not configured, it is assumed that the UCI serving cell group operates in one PUCCH serving cell group assumed above, or the following method may be applied.

Here, the PUCCH serving cell group including the PCell may be set by default. If the PUCCH SCell is configured in the terminal, the terminal includes a first PUCCH serving cell group (eg, PUCCH Pcell group) and a second PUCCH serving cell group (eg, PUCCH Scell group), that is, two It may have a PUCCH serving cell group.

Here, according to the configuration of the base station in the same PUCCH serving cell group, the same or different UCI serving cell group configuration may be set in consideration of the type of control information to be transmitted by the terminal.

In addition, the format associated with the above-mentioned PUCCH transmission is one of the PUCCH format 1 / 1a / 1b / 3/4/5. And if a new PUCCH transmission format is defined, it can also be said to be the format associated with the above PUCCH transmission.

In addition, the above-mentioned PUCCH serving cell group is applied when the terminal is configured with at least one PUCCH SCell from the base station. The PCell (default) and the configured PUCCH SCells may 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. Configuration for each serving cell group is indicated by the base station through RRC signaling.

In addition, the above-mentioned UCI serving cell group may be limited in configuration to only serving cells (eg, SCell (UB)) set on the UB in one PUCCH serving cell group, or serving cells set on the LB and UB. (Eg, PCell (LB) and SCell (UB)). Such a configuration may be set in advance by the base station through the RRC signaling to the terminal. The UCI serving cell group may be configured and instructed by a base station to perform UCI transmission in specific serving cell (s) in the group for UCI transmission of serving cells in the group.

The UCI serving cell group configuration according to the present invention concentrates not only the serving cell associated with the LB but also specific serving cells (for example, PCell or PSCell (PUCCH SCell or Primary Scell)) in which UCI transmission associated with the UB is set on the LB. To avoid it. Accordingly, it provides an effect of off-loading data or control signal traffic to be transmitted to or from the UE to serving cells configured on the UB, whereby traffic loading balance and control of the LTE network are controlled. Can provide great efficiency and flexibility.

Hereinafter, assuming that the UE configured with the serving cell (s) on the LB and the serving cell (s) on the UB is triggered to transmit A-CSI by an uplink grant, and intends to transmit the UCI including the A-CSI. In the case of channel busy (busy) on a specific serving cell at the time point to the method for processing the UCI (for example, one of the time resources or frequency resources to drop the UCI, or transmit the UCI Specific examples of the present invention for the method of determining the above will be described.

Referring to FIG. 3, the UE receives an UL grant for a PUSCH of a UB serving cell (serving cell or CC belonging to an unlicensed band) (S300). Here, the uplink grant is downlink control information (DCI) transmitted from the base station to the terminal, and the uplink grant may be

DCI format

0 or 4 and include a CSI request. The uplink grant may or may not include scheduling information for PUSCH transmission on 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 indication of the uplink grant. In this case, the PUSCH may include A-CSI, or A-CSI and A / N.

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

When the CSI request is 2 bits, the content indicated by the CSI request may be different depending on the number of serving cells, a transmission mode (TM) and / or CSI subframe pattern configuration of each serving cell.

As an example, i) the CSI request is 2 bits, ii) TM 1-9 is set in the UE for all serving cells, and iii) the CSI subframe pattern configuration is not configured for any serving cell. Follow the instructions to trigger the A-CSI report.

Table 1

CSI request field value	Instruction
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 1st set of serving cells configured by higher layers
11	Aperiodic CSI report is triggered for a 2nd set of serving cells configured by higher layers

In the case where Table 1 above is available, one CSI report is performed for each serving cell. Therefore, if the CSI request field value of "10" or "11" in Table 1, CSI reporting by each CSI request field value for some serving cells through RRC signaling (e.g., an 8-bit bit string). The base station may indicate to the terminal whether the trigger is uplink using the uplink grant. On the other hand, the CSI request field "01" will be indicated to the terminal by the base station when triggering the A-CSI report for the serving cell in which the PUSCH transmission indicated by the uplink grant is performed.

As described above, the A-CSI report for up to five serving cells may be triggered within a set of serving cells for A-CSI report triggering configured by RRC signaling.

As another example, i) a CSI request is 2 bits, ii) TM 10 is configured in at least one serving cell, and iii) a UE whose CSI subframe pattern configuration is not configured for any serving cell is indicated in Table 2 below. Trigger A-CSI reporting according to the content.

TABLE 2

CSI request field value	Instruction
00	No aperiodic CSI report is triggered
01	Aperiodic CSI report is triggered for a set of CSI process (es) configured by higher layers for serving cell c )
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 reporting may be performed based on the CSI process configuration if the terminal is configured with TM10 in at least one serving cell or CSI subframe pattern configuration. Accordingly, the base station may set a CSI process in the terminal, and the CSI process ID for identifying the CSI process may be defined for each serving cell frequency. The CSI process ID value ranges from 1 to the maximum number of CSI processes (eg, 4). One CSI-Reference Signal (CSI-RS) resource configuration and one CSI-Interference Measurement (CSI-IM) configuration are associated with one CSI process, and each CSI process has a precoding matrix index (PMI) and / or rank (RI). information) You can make independent settings for reporting.

As described above, CSI request values "10" (hereinafter referred to as trigger 10) and "11" (hereinafter referred to as trigger 11) for the UE to which the CSI process is set up to 5 CSI processes (or all serving cell frequencies) Across all serving frequencies can be set. Up to four CSI processes can be configured per one serving cell frequency. Each CSI process includes configuration information for A-CSI reporting. In particular, each CSI process includes a configuration related to association in CSI request values 01, 10, and 11 in an uplink grant. Table 3 is an example of one setting. If an indication that the CSI request value in the uplink grant corresponds to 10 is indicated to the UE, the UE transmits an A-CSI report to the base station through PUSCH transmission for CSI processes corresponding to Trigger 10. The number of corresponding CSI processes can be set up to 5 for each of Trigger 10 or Trigger 11.

TABLE 3

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 UE does not expect that the same CSI process is duplicated and associated with multiple Trigger 10 and Trigger 11. That is, one CSI process is associated with only one Trigger code point (ie, either Trigger 10 or Trigger 11) for aperiodic CSI reporting. A-CSI reporting and P-CSI reporting may be performed only for activated serving cells.

As another example, i) the CSI request is 2 bits, ii) the CSI subframe pattern configuration is configured for at least one serving cell terminal triggers A-CSI reporting according to the instructions of Table 4 below.

Table 4

CSI request field value	Instruction
00	No aperiodic CSI report is triggered
01	Aperiodic CSI report is triggered for the set of CSI process (s) and / or {CSI process, CSI subframe set} -pair (s) set by the higher layer for serving cell c. for a set of CSI process (es) and / or {CSI process, CSI subframe set} -pair (s) configured by higher layers for serving cell c)
10	Aperiodic CSI report is triggered for a 1st set for the first set of CSI process (s) and / or {CSI process, CSI subframe set} -pair (s) set by a higher layer. 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 for a second set of CSI process (s) and / or {CSI process, CSI subframe set} -pair (s) set by a higher layer. of CSI process (es) and / or {CSI process, CSI subframe set} -pair (s) configured by higher layers)

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

After receiving the uplink grant indicating 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 then transmits the CSI report as a response to the CSI request. It prepares according to predetermined conditions. Here, the predetermined condition may mean the conditions according to Tables 1, 2, 4, and the description thereof.

In addition, the terminal A-CSI or A-CSI and A / N, or A-CSI and A / N and SR (scheduling request) (hereinafter referred to as A-CSI or with others) in a predetermined condition The base station transmits the data to the base station in the determined manner.

For example, the UE may first determine a predetermined condition for preparing CSI report transmission, and then determine a predetermined condition for transmitting A-CSI, or the like, and first determine a predetermined condition for transmitting A-CSI, and then prepare for CSI report transmission. The predetermined condition may be determined. In the following description, the terminal first determines a predetermined condition for transmitting A-CSI and the like and then determines a predetermined condition for preparing to generate CSI report transmission, but the technical spirit of the present invention is not limited thereto.

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

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

First, the operation of Case 1 will be described in detail. If simultaneous transmission of PUSCH and PUCCH is not configured, the UE is successful in (E) CCA in the current subframe and the UB serving cell (eg, the UB serving cell of a specific subframe in which PUSCH is scheduled to be transmitted according to an uplink grant). In other words, it is determined whether the channel occupancy is possible (S310).

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

In step S310, if the CCA is not successful, the terminal transmits the A-CSI and the like to the base station through another time resource on the UB serving cell and / or a different frequency resource than the UB serving cell (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 terminal determines that the uplink grant is valid for a predetermined time (for example, t) It may be determined that the CSI request in the uplink grant is also valid. Therefore, if the UE succeeds in (E) CCA for the UB serving cell within a predetermined time t, the UE may transmit A-CSI and the like to the base station through the UB serving cell. Detailed examples of this are described in FIGS. 5, 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 impossible due to the 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 may transmit A-CSI or the like to the base station through the other serving cell. Detailed examples of this are described in FIGS. 5, 6A-6B, 8A-8B, and 9A-9D.

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

In step S305, if simultaneous transmission is configured, the terminal performs operations S325 (S325, S330, and S335). The operation of Case 2 is described in detail as follows. When simultaneous transmission of PUSCH and PUCCH is configured, the UE determines whether (E) CCA is successful in the current subframe and the UB serving cell (eg, the UB serving cell of a specific subframe scheduled for transmission of the PUSCH according to an uplink grant). It is determined (S325).

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

In step S325, if the CCA is unsuccessful, the UE transmits the A-CSI to the base station through another time resource on the UB serving cell and / or a frequency resource different from the UB serving cell, and A / N or A / N and The SR transmits 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 terminal determines that the uplink grant is valid for a predetermined time (for example, t) It may be determined that the CSI request in the uplink grant is also valid. Therefore, if the UE succeeds in (E) CCA for the UB serving cell within a predetermined time t, the UE may transmit A-CSI to the base station through the UB serving cell. Detailed examples of this are described in FIGS. 5, 8A and 8B.

According to another aspect of the present invention, although PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the failure of the existing UB serving cell, PUSCH transmission is scheduled and transmitted in at least one other serving cell on the same subframe. If this is possible, the terminal may transmit the A-CSI to the base station through the other serving cell. Detailed examples of this are described in FIGS. 5, 6A-6B, 8A-8B, and 9A-9D.

According to another aspect of the present invention, step S335 may be replaced by the step of the UE automatically abandoning or dropping the A-CSI report triggered by the CSI request.

Meanwhile, if there is no uplink transmission (i.e., PUSCH) including A-CSI in a resource scheduled to the UE through blind decoding, the base station recognizes that (E) CCA has failed, and on another serving cell that is already promised. A-CSI report can be received from the terminal using the PUSCH (if present).

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

1. The first Example -Case 1

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

Referring to FIG. 4, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and U-SCell # 2, respectively (S400). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S405). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. A set of serving cells or a CSI process set corresponding to or associated with an A-CSI trigger by a CSI request of an uplink grant of S405 is determined by a higher layer configuration such as an RRC layer. Meanwhile, the uplink grant includes scheduling information for the PUSCH of U-SCell # 2. After the subframe (eg, subframe n-4) that receives the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (eg, subframe n) according to the indication of the uplink grant. You can expect to send.

If the UE succeeds in (E) CCA for PUSCH transmission of U-SCell # 2 (S410), the UE transmits A-CSI and the like to the base station through the PUSCH of U-SCell # 2 (S415). As an example, when there is only transmission of A-CSI in a subframe in which PUSCH transmission is scheduled, the UE transmits A-CSI to a base station through a PUSCH on U-SCell # 2. As another example, when there is both A-CSI and A / N transmission in a subframe scheduled for PUSCH transmission, the UE transmits A-CSI and A / N to the base station through the PUSCH on U-SCell # 2.

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

First, referring to FIG. 5, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and U-SCell # 2, respectively (S500). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S505). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. 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 U-SCell # 2. After the subframe (eg, subframe n-4) that receives the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (eg, subframe n) according to the indication of the uplink grant. You can expect to send.

However, if the UE fails (E) CCA for PUSCH transmission of U-SCell # 2 (S510), the UE cannot transmit A-CSI and the like to the base station through 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 (ie, CSI reports of all CSI processes or all serving cells associated with triggering) and A / N transmissions (if A in the same subframe) / N transmission) should be abandoned together with uplink PUSCH transmission. According to the method 1-1, if A-CSI reporting and additional A / N transmission are abandoned due to CCA failure in the UB band (that is, uplink transmission failure), the downlink performance may be severely affected. In fact, even if the base station succeeds in occupying the downlink channel, since it does not receive enough channel information from the terminal, only scheduling that provides a very low data rate may be possible. Even transmission by such a conservative scheduling is likely to fail in the channel environment of the terminal (for example, very low signal to interference plus noise ratio (SINR)). In addition, since A / N reception failure by the base station has an immediate effect on downlink performance, a method for complementing A-CSI and A / N transmission is required.

To this end, the UE secures additional resources capable of transmitting A-CSI. For example, the UE may select another time resource (method 1-2) on U-SCell # 2 or another frequency resource (method 1-3, 1-4, or 1-5) different from U-SCell # 2. It can be used for transmission.

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), the uplink It may be determined that the CSI request in the grant is also valid. Therefore, if the terminal succeeds in CCA for the U-SCell # 2 within a predetermined time t, it can transmit the A-CSI to the base station through the U-SCell # 2.

For example, referring to FIG. 5, even if the PUSCH transmission by the uplink grant G has failed to occupy the channel of U-SCell # 2 in the scheduled subframe n (S510), the UE returns again within a predetermined time t (S520). It is possible to succeed in occupying the channel of the U-SCell # 2 (S525). In this case, the UE may perform PUSCH transmission in a subframe (eg, subframe n + k) in which k subframes have elapsed from a subframe (eg, subframe n) in which A-CSI transmission was expected through PUSCH. There is (S530). In this case, the CSI request in S505 is still considered valid. However, if the UE does not succeed in occupying the channel of the U-SCell # 2 even after waiting for a predetermined time t (S520), the terminal gives up the A-CSI request and all uplink grants.

Here, the predetermined time may be defined based on predefined time information (for example, subframe unit) or by a timer in the terminal. Alternatively, the predetermined time may be PDCCH / with an A-CSI transmission window (eg, one new DCI format (eg, DCI format including an A-CSI request field) indicating PUSCH transmission on a plurality of subframes). Number of PUSCH transmission subframes indicated by EPDCCH or a set of indexes). The predefined time information may be defined as a time for which the terminal attempts to succeed in channel occupancy within a specific number of subframes. Alternatively, the timer starts when the UE fails to transmit the PUSCH, and when the timer value set thereafter expires, all information in the uplink grant may be abandoned. The timer value may be set by the base station or may be predetermined.

Method 1-3

According to Method 1-3, if PUSCH transmission is scheduled in a subframe indicated by an uplink grant, at least one other serving cell on the same subframe is scheduled, even if PUSCH transmission is impossible due to the failure of U-SCell # 2. The terminal may transmit A-CSI and the like to the base station through the other serving cell (S535, S540).

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

In another aspect, if uplink (PUSCH) transmission is scheduled in at least one secondary serving cell of the same subframe, and uplink (PUSCH) transmission is not scheduled in the main serving cell or PUCCH SCell, the UE index P-back the A-CSI in the uplink transmission of the selected secondary serving cell can be transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Alternatively, the selected secondary serving cell may have the highest index among the at least one secondary serving cell.

In another aspect, if uplink (PUSCH) transmission is scheduled in at least one secondary serving cell of the same subframe and uplink (PUSCH) transmission is not scheduled in the main serving cell or PUCCH SCell, the at least one If one or more secondary serving cells (eg, Licensed SCell, L-SCell) configured on the LB among the secondary serving cells of the UE, the UE transmits the uplink transmission of the secondary serving cell selected based on the index among the secondary serving cells on the LB. P-back the A-CSI can be transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Alternatively, the selected secondary serving cell may have the highest index among the at least one secondary serving cell. If there are no secondary serving cells on the LB, the UE gives up the A-CSI report or reports the A-CSI through the secondary serving cell having the lowest or highest secondary serving cell index among the secondary serving cells on the UB. However, if no secondary serving cell exists, the A-CSI report and uplink transmission are naturally abandoned.

6A and 6B illustrate another example of an A-CSI reporting method according to Case 1 of the first embodiment of the present specification. This is a case where the UE fails in CCA, and there are reports of A-CSI and A / N transmission.

6A and 6B, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and U-SCell # 2, respectively (S600). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S605). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink grant of 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 U-SCell # 2. After the subframe (eg, subframe n-4) that receives the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (eg, subframe n) according to the indication of the uplink grant. You can expect to send.

Method 1-4

As an example, referring to FIG. 6A, PUSCH transmission is disabled in a subframe indicated by an uplink grant due to a failure of U-SCell # 2 (S610), and uplink transmission (PUSCH) is in the same subframe. If not scheduled in another serving cell (S615), the UE drops the A-CSI triggered by the CSI request of the uplink grant (S620), and transmits the A / N. In this case, the UE transmits the A / N through the PUCCH of the main serving cell (S625) or through the secondary serving cell (PUCCH SCell) in which the PUCCH is set (S630).

Here, the PUCCH is transmitted through the secondary serving cell in which A / N is transmitted through the PUCCH secondary serving cell when the serving cell to which the scheduled PUSCH is transmitted is included in the PUCCH secondary serving cell group. Otherwise, if the PUCCH secondary serving cell is not configured or the serving cell to which the scheduled PUSCH is transmitted belongs to the serving cell group including the PCell, A / N is transmitted through the PUCCH of the PCell.

As another example, PUSCH transmission is disabled in the subframe indicated by the uplink grant due to a failure of U-SCell # 2 (S610), and uplink transmission (PUSCH) is scheduled in another serving cell in the same subframe. If not (S615), the UE drops not only A-CSI triggered by the CSI request of the uplink grant, but also A / N.

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 on the same subframe If the PUSCH transmission is scheduled in the cell, the UE may transmit A-CSI and the like to the base station through the other serving cell.

Specifically, referring to FIG. 6B, if the UE fails in CCA for PUSCH transmission of U-SCell # 2 (S610) and PUSCH transmission is scheduled in at least one other serving cell on the same subframe (S635). The terminal may transmit A-CSI to the base station through the other serving cell (S645, S650, S655). At this time, a rule for selecting another serving cell for A-CSI transmission is as follows.

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

In another aspect, if PUSCH transmission is not scheduled in the primary serving cell among at least one other serving cell of the same subframe, and PUSCH transmission is scheduled in at least one secondary serving cell, the at least one secondary serving cell is an LB. Regardless of whether belonging to or belonging to UB, the UE transmits both A-CSI and A / N to the base station through the PUSCH on the secondary serving cell selected 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 secondary serving cell may have the highest index among the at least one secondary serving cell (S650).

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

2. The first Example -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 specification. This is a case where the terminal succeeds in (E) CCA.

Referring to FIG. 7, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and the U-SCell # 2, respectively (S700). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S705). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. A set of serving cells or a CSI process set corresponding to or associated with an A-CSI trigger by a CSI request of an uplink grant of S705 is determined by a higher layer configuration such as an RRC layer. Meanwhile, the uplink grant includes scheduling information for the PUSCH of U-SCell # 2. After the subframe (for example, subframe n-4) receiving the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (for example, subframe n) according to the indication of the uplink grant. You can expect to send.

If the UE succeeds in (E) CCA for PUSCH transmission of U-SCell # 2 (S710), the UE transmits A-CSI and the like to the base station through the PUSCH of U-SCell # 2 (S715). As an example, when only transmission of A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the UE transmits A-CSI to a base station through a PUSCH on U-SCell # 2. As another example, when there is both A-CSI and A / N transmission in a subframe scheduled for PUSCH transmission, the UE transmits A-CSI to a base station through a PUSCH on U-SCell # 2 and transmits A / N. Transmit to the base station through 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 configured for the UE. Assume that U-SCell # 2/3/4 is present in one UCI serving cell group. Indicating PDSCH and / or SPS release in a serving cell (eg, U-SCell # 2/3/4) in the same UCI serving cell group in a subframe in which PUSCH (S715) transmission with A-CSI reporting is performed If there is additional A / N transmission associated with PDCCH indicating SPS release (S700), and if (E) CCA performed by UE for the PUSCH (S715) transmission is successful, the PUSCH (S715) transmission. Transmit UCI information (eg, A-CSI, A / N) associated with the serving cell (s) in the UCI serving cell group within.

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

8A is a view for explaining another example of the A-CSI reporting method according to Case 2 of the first embodiment of the present specification. This is a case where the UE fails in (E) CCA, and only reports of A-CSI exist.

Referring to FIG. 8A, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and U-SCell # 2, respectively (S800). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S805). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink 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 U-SCell # 2. After the subframe (eg, subframe n-4) that receives the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (eg, subframe n) according to the indication of the uplink grant. You can expect to send.

However, if the UE fails (E) CCA for PUSCH transmission of U-SCell # 2 (S810), the UE cannot transmit A-CSI and the like to the base station through the PUSCH of U-SCell # 2 (S815). Examples of the method that the terminal can take in step S815 are as follows.

Method 2-1

Method 2-1 is similar to Method 1-1 of Case 1. Specifically, according to Method 2-1, all A-CSI reports (ie, CSI reports of all CSI processes or all serving cells associated with triggering) and A / N transmissions (if the same subframe is associated with A-CSI report triggering). A / N transmission) is given up together with uplink PUSCH transmission.

Method 2-2

Method 2-2 is similar to Method 2-1 of Case 1. Specifically, according to the method 2-2, 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 (S820), It may be determined that the CSI request in the uplink grant is also valid. Therefore, if the terminal succeeds in CCA for the U-SCell # 2 within a predetermined time t, it can transmit the A-CSI to the base station through the U-SCell # 2.

For example, referring to FIG. 8A, even if 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). O-SCell # 2 can succeed in channel occupancy (S825). In this case, the UE may perform PUSCH transmission in a subframe (eg, subframe n + k) in which k subframes have elapsed from a subframe (eg, subframe n) in which A-CSI transmission was expected through PUSCH. There is (S830). In this case, the CSI request in S805 is still considered valid. However, if the channel occupancy of U-SCell # 2 does not succeed until a certain time t (S820) expires, the terminal gives up the A-CSI request and all uplink grants. In this case, the examples described in Method 1-2 may be applied to specific embodiments related to a predetermined time.

Method 2-3

According to the method 2-3, if the PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the 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 the A-CSI to the base station through the other serving cell (S835, S840).

In another aspect, if uplink (PUSCH) transmission is scheduled in at least one secondary serving cell of the same subframe and uplink (PUSCH) transmission is not scheduled in the main serving cell or PUCCH SCell, the at least one If one or more secondary serving cells (eg, Licensed SCell, L-SCell) configured on the LB among the secondary serving cells of the UE, the UE transmits the uplink transmission of the secondary serving cell selected based on the index among the secondary serving cells on the LB. P-back the A-CSI can be transmitted to the base station. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell. Alternatively, the selected secondary serving cell may have the highest index among the at least one secondary serving cell. If there are no secondary serving cells on the LB and there are other secondary serving cells scheduled for PUSCH transmission on the UB, the UE may abandon the A-CSI report or transmit the A-CSI report on the other secondary serving cell.

8B illustrates a case in which A-CSI reporting and / or A / N transmission according to Case 2 is present in a specific UL subframe in the first embodiment of the present specification. 8B illustrates that at least one UCI serving cell group is configured in one PUCCH serving cell group, and A / N information corresponding to PDSCH transmission in a licensed serving cell should always be transmitted in the PUCCH / PUSCH of the licensed serving cell. Assume

That is, an additional UCI serving cell group in one PUCCH serving cell group is considered in an environment in which the base station is configured for the UE. The UCI serving cell group may be configured for one or a plurality of UCI transmissions in one PUCCH serving cell group. Two UCI Serving Cell Group # 0 and UCI Serving Cell Group # 1 in one PUCCH Serving Cell Group (PUCCH Cell Group # 0) are configured to the UE by the base station. In the UCI serving cell group # 0, SCell # 1 and SCell # 2 set on the UB, and SCell # 3 and SCell # 4 are configured in the UCI serving cell group # 1, respectively. UCI information for serving cells (SCell # 1 and 2) belonging to UCI serving cell group # 0 in a specific subframe (SCell # 1) indicates that PU grant transmission by the UL grant 862 having an A-CSI request indicates PUSCH transmission. Will be sent by the terminal at 2.

In addition, according to the present invention, the A / N information corresponding to the PDSCH transmitted in the unlicensed serving cell (UB) supports transmission in the PUSCH of the unlicensed serving cell.

On the other hand, in the setting for the A-CSI report request of the licensed serving cell, if the "trigger code point" for the A-CSI report (for example, trigger 01/10/11 associated with the CSI request field in the UL grant, the table 1-Table 4), if the configuration for the licensed serving cell is not limited to serving cells in the UCI serving cell group only, the A-CSI reporting for the licensed serving cell with those of the unlicensed serving cell (if Can be sent).

For example, if the A-CSI reporting setting for the licensed serving cell PCell uses Table 1, the PUSCH transmission corresponding to the CSI request field value 10 (for example, Trigger 10) and having the A-CSI reporting request is If the UE is indicated by the base station in the unlicensed serving cell, A-CSI reporting for the PCell, which is a licensed serving cell, may be performed in the SCell, which is an unlicensed serving cell. These considerations are A-CSI reporting, which is determined by different transmission modes (e.g. TM9 / 10) and / or enhanced Interference Mitigation & Traffic Adaptation (eIMTA) transmission settings and / or whether more than five serving cells are configured. The same may be applied to Tables 2 to 4 corresponding to the setting and the triggering method.

More specifically, referring to FIG. 8B, A / N, SR and / or A-CSI reporting, which is UCI for licensed serving cells (PCell, SCell # 0) not configured as a UCI serving cell group, is performed in subframe n . If it should be, the PUCCH of the licensed serving cell (if there is only A / N, SR, without PUSCH transmission) or the selected PUSCH (if there is PUSCH transmission, whether or not PUSCH transmission of the unlicensed serving cell) -If CSI or A-CSI, A / N, SR). The selected PUSCH means that UCI information is transmitted in a PCell (if there is a PUSCH transmission) when PUSCH transmission occurs in the same subframe in a plurality of licensed serving cells, or only in SCells that are licensed serving cells. When there is a PUSCH transmission, this may mean transmitting UCI information in the SCell having the smallest SCell index.

On the other hand, one UCI transmission timing in the UCI serving cell group # 0 850 is based on the information indicated by the A-CSI report request field and / or the A / N report request field in a UL grant, and thus, the UL grant is determined. It can be defined as transmitting the corresponding UCIs in the unlicensed serving cell 855 in which PUSCH transmission of subframes is performed after at least four (or more than four) subframes are received.

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

Alternatively, as described above, PUSCH transmission on a plurality of serving cells in the same subframe as described above may indicate A / CSI report request and / or a plurality of A / N report requests by a plurality of UL grants, instead of A / C. The same UCI may be transmitted for all / some PUSCH transmissions on a plurality of serving cells scheduled in a subframe related to the corresponding UCI transmission timing through only one A-CSI reporting request (if any) without introducing the N report request field. . The main difference between the above method is that the PUCI transmission having the same UCI is indicated through a UL grant, or the UCI is transmitted to all / some (including one) PUSCH transmissions scheduled in a subframe corresponding to the corresponding UCI transmission timing without such signaling. Whether the transfer is performed. If UCI overhead, which may occur due to the same UCI transmission for all PUSCH transmissions, is a problem, the UCI may be transmitted only in part or one PUSCH transmission in the order of serving cells having the smallest SCell index among the plurality of PUSCHs. have. Alternatively, the serving cell corresponding to some PUSCH transmission may be previously set up by the base station in the RRC together with the UCI serving cell group configuration.

This UCI transmission can prevent UCI reporting from dropping in a situation where PUSCH transmission is not possible due to CCA busy, and can improve the reliability of UCI reception by obtaining the combining gain through repeated UCI transmission. That provides the benefits. In addition, the proposed method provides an advantage of reducing the blind decoding burden of the base station when UCI transmission fails 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 subframe n , the assumed UCI transmission timing, are scheduled in SCell # 2 and additionally make A / N reporting requests in other serving cells (SCell # 1). If the PUSCH transmission by the UL grant is scheduled to the terminal by the base station, the terminal is a PUSCH transmission 875, SCell # 1 with A-CSI (and / or A / N report) report in subframe n of SCell # 2 In the PUSCH transmission with the A / N report 855, all the UCI (A / N, A-CSI, etc.) information for the serving cells in the UCI serving cell group # 0 can be transmitted.

Here, as a method in the frequency domain view as in the method 2-3, A / N report request within each UL grant indicating each PUSCH transmission in a plurality of other unlicensed serving cells in the same subframe and / Or, if the A-CSI reporting request is included, UCIs (UCIs for serving cells in the UCI group) to be transmitted in the corresponding PUSCH transmission subframe are repeatedly performed (ie, the same UCI is repeatedly performed) with each PUSCH transmission. Suggest to do. In this case, the LAA terminal may 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 should be provided to the UE with the same A-CSI report triggering indication and configuration in a plurality of UL grants. If it is not the same, the terminal may determine that this is an error and ignore the request or may apply A-CSI report by applying only one selected request.

A description of the time domain perspective follows. As described in the method 2-2, when the PUSCH transmission with the A / N report and the A-CSI report fails to occupy the channel due to CCA busy (LBT failure) in the UCI transmission method from the time domain perspective, In consideration of the method 2-2 and the method 2-3, an additional opportunity may be provided for transmitting corresponding UCI information in the subframe (s).

Since the above-described definition of the subframe refers to subframes capable of PUSCH transmission within a predetermined period as already described in the method 2-2, which is a serving cell such as the initial PUSCH transmission 875 but after another subframe ( 876, 877, 878, or another subframe after the other serving cell (if any). For example, when one UL grant (PDCCH / EPDCCH) indicating PUSCH transmission is received by the UE in a plurality of subframes, TBs transmitted through the PUSCH in each subframe may be different (for example, different HARQ). Basically, the same UCI information is transmitted through PUSCH repeatedly or delayed in at least some or all subframes among the

various subframes

875, 876, 877, and 878 after the UCI transmission timing. Can be. Therefore, even if the PUSCH transmission of subframe n in SCell # 2 is not performed due to CCA busy, at a later point in time, the CCSCH is busy even for PUSCH transmission (s) in other subframes scheduled through the same or different UL grants. Due to the same UCI information that could not be transmitted can be transmitted. In addition, the number of UL subframes that can be scheduled through one UL grant (for example, N) may be set by a higher layer, among which K number (K <= N) according to scheduling information of the UL grant. PUSCH transmission may be indicated in a subframe. In addition, as mentioned above, the UCI may be transmitted in all K subframes or may be transmitted through PUSCH in some subframes. The number T, T <= K of the UCI transmission subframes may be indicated through a UL grant. In FIG. 8B, the K value is 4 and the T value is equal to or smaller than 4 in SCell # 2 (UB). Alternatively, if the UCI transmission is delayed after subframes of z as subframes failed due to CCA busy and there is PUSCH transmission, the corresponding UCI may be transmitted through the PUSCH transmission.

As another embodiment, referring to FIG. 8C, the base station acquires a maximum channel occupancy time obtained through a DL category (Cat.) 4 LBT (for example, an LBT applying a variable size of a contention window and a random backoff). Occupancy Time (MCOT) can be shared. For example, the base station may use Cat. After performing 4 LBT to acquire the channel for MCOT 6ms, and then used for DL transmission including the UL grant transmission in the DL subframe corresponding to the first 2ms, a time gap of at least a certain time after the DL transmission (for example, 25us ) In this case, the base station may share a portion of the MCOT time (eg, 6 ms (MCOT) -2 ms (for DL) = 4 ms) obtained by the base station by the UL transmission of the terminal to the terminal, the terminal before the UL transmission The CCA may be performed for only 25us to perform UL transmission within the MCOT time. In this case, the proposed method may be applied to the UCI transmission by the terminal.

For example, the base station may indicate a plurality of UL scheduling information to the UE through one PDCCH / EPDCCH transmission in one DL subframe. Such scheduling information may indicate PUSCH transmission and UCI transmission in

subframes

890, 892, 893, 895. Thus, the same (or delayed) UCI transmission may be performed with PUSCH transmission in some or all of the subframes above in the MCOT.

The proposed time domain method and frequency domain method can be optionally used through indicators in DCI (e.g., A-CSI report request field, A / N report request field) by the scheduling strategy of the base station or without such indicator ( Of course, the A-CSI report request is necessary for the purpose of triggering the A-CSI report in one grant instead of a plurality of grants, but is not used for the method of determining the time domain and frequency domain for A-CSI reporting or the like). It can be applied by the proposed method. In addition, one or both of the above methods may be selectively indicated to the UE by RRC configuration.

In Case 2, if the UE has not configured the UCI serving cell group, and if the UCI to be transmitted in one PUCCH serving cell group in a specific subframe is configured with A / N, SR and A-CSI reporting, license serving If there is no PUSCH transmission in the cell, at least A / N and SR for the licensed serving cell are transmitted through the PUCCH of the licensed serving cell. Otherwise, if there is a PUSCH transmission in the licensed serving cell PCell, the PCell is transmitted only in the licensed serving cell SCell. If present, it is transmitted through the SCell having the smallest 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 performing the PUSCH transmission. On the other hand, the A / N corresponding to the unlicensed serving cell is transmitted through the PUCCH of the licensed serving cell PCell / PSCell if the PUSCH transmission is not in the same subframe because the UCI serving cell group is not configured, and if the PUSCH is transmitted to the PCell / PSCell If there is a transmission through the PCell or in the PCell / PSCell but there is a PUSCH transmission in the SCell is transmitted in the serving cell having the smallest SCell index or in the serving cell having the smallest SCell index among the SCell of the unlicensed serving cell Can be. The A-CSI report is transmitted through the PUSCH transmission serving cell having the A-CSI report.

9A to 9D illustrate another example of an A-CSI reporting method according to Case 2 of the first embodiment of the present specification. This is a case where the UE fails in CCA, and there are reports of A-CSI and 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 terminal through the L-PCell and U-SCell # 2, respectively (S900). In addition, the base station transmits an uplink grant G for the PUSCH of the U-SCell # 2 to the terminal through the L-SCell # 1 (S905). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink 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 U-SCell # 2. After the subframe (eg, subframe n-4) that receives the uplink grant, the UE performs a PUSCH on U-SCell # 2 of a specific subframe (eg, subframe n) according to the indication of the uplink grant. You can expect to send.

Method 2-4

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

As an example, when PUSCH transmission is disabled due to the failure of U-SCell # 2 in the subframe indicated by the uplink grant (S910), the UE drops the A-CSI triggered by the CSI request of the uplink grant. (S915), and transmits A / N. In this case, the UE transmits the A / N through the PUCCH of the main serving cell (S920) or through the secondary serving cell (PUCCH SCell) in which the PUCCH is set (S925).

As another example, if the PUSCH transmission is not possible due to the failure of the U-SCell # 2 in the subframe indicated by the uplink grant (S910), the UE is the only A-CSI triggered by the CSI request of the uplink grant Instead, drop all A / Ns.

Method 2-5

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

As an example, the PUSCH transmission in the subframe indicated by the uplink grant is disabled due to the failure to occupy U-SCell # 2 (S910), and the uplink transmission (PUSCH) is not scheduled in another serving cell in the same subframe. If not (S930), the UE drops the A-CSI triggered by the CSI request of the uplink grant (S935), and transmits the 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 through the secondary serving cell (PUCCH SCell) in which the PUCCH is set (S945). Here, the PUCCH is transmitted through the secondary serving cell in which A / N is transmitted through the PUCCH secondary serving cell when the serving cell to which the scheduled PUSCH is transmitted is included in the PUCCH secondary serving cell group. Otherwise, if the PUCCH secondary serving cell is not configured or the serving cell to which the scheduled PUSCH is transmitted belongs to the serving cell group including the PCell, A / N is transmitted through the PUCCH of the PCell.

As another example, PUSCH transmission is disabled in the subframe indicated by the uplink grant due to the failure of occupancy of the U-SCell # 2 (S910), and the uplink transmission (PUSCH) is scheduled in another serving cell in the same subframe. If not (S930), the UE drops not only A-CSI triggered by the CSI request of the uplink grant, but also A / N (or A / N and SR).

Method 2-6

Method 2-6 is described with reference to FIGS. 9C and 9D.

According to the method 2-6, although PUSCH transmission in the subframe indicated by the uplink grant is impossible due to the occupancy failure (S910) of the U-SCell # 2, the PUSCH in at least one other serving cell on the same subframe If the transmission is scheduled, the terminal may transmit A-CSI and the like to the base station through the other serving cell (transmitting through U-SCell # 3 may be dropped (S955)).

Specifically, if the UE fails in CCA for PUSCH transmission of the U-SCell # 2 (S910), PUSCH transmission is scheduled in at least one other serving cell on the same subframe (S950 or S975), the UE is A -CSI and the like can be transmitted 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 A-CSI transmission is as follows. Here, some rules may be further refined in consideration of the transmission of the SR.

a. Other Serving cell Main Serving Cell or PUCCH SCell If you include

In one aspect (Alt 1), i) if a PUSCH transmission is scheduled in a primary serving cell or a PUCCH SCell among at least one other serving cell of the same subframe, the UE may perform A-CSI on the PUSCH of the primary serving cell or the PUCCH SCell. And transmit both A and N (S960 or S965). And ii) if transmission of the SR is additionally scheduled in the same subframe, the UE transmits the A-CSI to the base station on the PUSCH of the main serving cell or the PUCCH SCell (S985 or S990) and the A / N and SR to the main serving cell. Or it transmits to the base station on the PUCCH of the PUCCH SCell (S997).

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

b. Other Serving cell PUSCH Transfer scheduled SCell If you include

In one aspect (Alt 1), i) if the PUSCH transmission is not scheduled in the primary serving cell of at least one other serving cell of the same subframe, and the PUSCH transmission is scheduled in at least one secondary serving cell, the at least one Regardless of whether the secondary serving cell of belongs to LB or UB, the UE transmits both A-CSI and A / N to the base station through the PUSCH on the secondary serving cell selected based on the index. Here, the selected secondary serving cell may have the lowest index among the at least one secondary serving cell (S970). Alternatively, the selected secondary serving cell may have the highest index among the at least one secondary serving cell (S965). And ii) if the transmission of the SR is additionally scheduled in the same subframe, the UE transmits the A-CSI to the base station through the PUSCH on the secondary serving cell selected based on the index (S990), and the A / N and SR The UE transmits the serving cell or the PUCCH SCell to the base station on the PUCCH (S997).

In another aspect (Alt 2), if the PUSCH transmission is not 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 secondary serving cell, the terminal is based on the index The A-CSI is transmitted to the base station through the PUSCH on the selected secondary 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 the PUCCH SCell (S997).

c. Other Serving cell LB or In UB PUSCH Transfer scheduled SCell If you include

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

In another aspect (Alt 2), i) if the PUSCH transmission is not scheduled in the primary serving cell of the same subframe, but the PUSCH transmission is scheduled in at least one other secondary serving cell included in the LB, the UE is included in the LB The A-CSI is transmitted to the base station through the PUSCH of the secondary serving cell corresponding to the lowest L-SCell index among the secondary serving cells (S990), and the A / N (or A / N and SR) is the primary serving cell or The PUCCH SCell is transmitted to the base station (S997). And ii) if the serving cell scheduled for PUSCH is not included in the LB and the PUSCH transmission is scheduled in the secondary serving cell included in the UB, the UE is assigned to the lowest index among the secondary serving cells scheduled for PUSCH transmission in the UB. The A-CSI is transmitted to the base station through the PUSCH of the corresponding secondary serving cell (S995), and the A / N (or A / N and SR) is transmitted to the base station through the main serving cell or the PUCCH SCell (S997).

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 in which the UE transmits A-CSI report and A / N in one PUSCH (selected). The advantages of Alt 1 are that in an environment where (E) PDCCH is used, PUCCH resources are reserved based on an implicit resource allocation scheme ((E) CCE ((enhanced) Control Channel Element) index value to which (E) PDCCH is allocated). Explicit Resource Allocation Method (Set a plurality of PUCCH resources by higher layer signaling and recycle one of the plurality of sets by recycling the TPC (Transmit Power Control) field in the (E) PDCCH transmitted on the secondary serving cell. In the case of indicating that the PUCCH resources are reserved), the base station can efficiently use the PUCCH resources.

Also, if possible, fewer channels are transmitted in the same subframe, which is 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 UE allocates the power required by the PUCCH first by the uplink power control method in carrier aggregation and then allocates the PUSCH. In limited circumstances, power for PUSCH transmission may be scaled down. This situation may adversely affect uplink coverage of the terminal.

On the other hand, Alt 2 does not need to define additional operations depending on whether PUSCH can be transmitted for A-CSI reporting, which leads to a simpler implementation than Alt 1. This is because A / N transmission is always fixed to PUCCH.

Hereinafter, a second embodiment and a method of reporting A-CSI for each case will be described in detail. The second embodiment restricts the UE to transmit A-CSI and A / N through PUCCH or PUSCH or PUCCH / PUSCH (if simultaneous PUCCH and PUSCH transmission is configured to the UE) only in the serving cells included in the LB. . That is, the UE expects that uplink scheduling for A-CSI and A / N transmission will be performed only in the serving cell in the LB, thereby piggybacking A-CSI and A / N for 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 simultaneous transmission are configured for the UE. If the simultaneous transmission is not configured, the terminal performs the operation of Case 1, and if the simultaneous transmission is configured, the terminal performs the operation of Case 2.

3. Second Example -Case 1

Referring to FIG. 10, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and the U-SCell # 2, respectively (S1000). In addition, the base station transmits an uplink grant G for the PUSCH of the L-SCell # 1 to the terminal through the L-SCell # 1 (S1005). The uplink grant includes a CSI request, and in this example, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. That is, the set of serving cells or the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink grant of S1005 are 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. According to the indication of the uplink grant, the UE performs a PUSCH on the L-SCell # 1 of a specific subframe (for example, subframe n) after the subframe (for example, subframe n-4) that receives the uplink grant. It expects to transmit, and does not expect to transmit A-CSI in U-SCell # 2, U-SCell # 3 serving cells included in the UB (S1010). This is true even if CCAs for U-SCell # 2 and U-SCell # 3 succeed.

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

4. Second Example -Case 2

Referring to FIG. 11, the LB includes an L-PCell and an L-SCell # 1, and the UB includes a U-SCell # 2, a U-SCell # 3, and a U-SCell # 4. The base station transmits the PDSCH to the terminal through the L-PCell and the U-SCell # 2, respectively (S1100). In addition, 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, it is assumed that the CSI request value is 10 (Trigger 10). The content indicated by the CSI request value Trigger 10 may be a set of first serving cells according to Table 1, or a set of first CSI processes according to Table 2 or Table 4, and in this example, L-PCell, L- It is assumed that SCell # 1, U-SCell # 2, and U-SCell # 3 are included. That is, the CSI process set corresponding to the A-CSI trigger by the CSI request of the uplink grant of 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. According to the indication of the uplink grant, the UE performs a PUSCH on the L-SCell # 1 of a specific subframe (for example, subframe n) after the subframe (for example, subframe n-4) that receives the uplink grant. It expects to transmit and does not expect to transmit A-CSI in U-SCell # 2, U-SCell # 3 serving cells included in the UB (S1110). This is true even if CCAs for U-SCell # 2 and U-SCell # 3 succeed.

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

Referring to FIG. 12, the terminal 1200 and the base station 1250 perform the A-CSI reporting and A / N transmission operations disclosed herein.

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

The processor 1210 implements the functions, processes, and / or methods proposed herein. Specifically, the processor 1210 implements all operations of the terminal described in the embodiment of FIG. 3 disclosed herein, and performs generation and control operations of A-CSI, A / N, SR, etc. according to FIGS. 4 to 9D. Perform. The memory 1225 is connected to the processor 1210 and stores various information for driving the processor 1210.

The RF unit 1220 is connected to the processor 1210 and transmits and / or receives a radio signal. For example, the RF unit 1220 may transmit A-CSI, A / N, SR to the base station 1250, or receive an uplink grant and PDSCH including a CSI request from the base station 1250. In more detail, the RF unit 1220 receives an UL grant from the base station 1250 for indicating PUSCH transmission of a UB serving cell (a serving cell or CC belonging to an unlicensed band). Here, the uplink grant is downlink control information transmitted from the base station 1250 to the terminal 1200. The uplink grant may be

DCI format

0 or 4 and include a CSI request. The RF unit 1220 may simultaneously transmit A-CSI and A / N signals on the PUSCH or divide the PUSCH and the PUCCH based on whether simultaneous transmission of the PUSCH and the PUCCH is set.

CSI requests are one or two bits long. (E) when a plurality of serving cells are configured in the terminal 1200 and transmit an uplink grant (E) when a PDCCH transmission is transmitted in a UE-specific search space or a plurality of CSI processes are configured in the terminal and transmit an uplink grant (E) If the PDCCH transmission is sent on the terminal specific search space, the CSI request has 2 bits, otherwise the CSI request is 1 bit. The terminal 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 be different depending on the number of serving cells, transmission mode (TM) and / or CSI subframe pattern setting of each serving cell. Specific examples of the instructions may be in accordance with Table 1, Table 2 and Table 4. The uplink grant also includes scheduling information for the PUSCH of the UB serving cell. The UE 1200 may expect to transmit the PUSCH on the UB serving cell of the current subframe according to the indication of the uplink grant.

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

The CSI reporting controller 1212 decodes and interprets an uplink grant, PDSCH, etc. in the RF unit 1220 and controls the A-CSI reporting procedure accordingly.

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

For example, the CSI reporting controller 1212 may first determine a predetermined condition for preparing CSI report transmission, and then determine a predetermined condition for transmitting A-CSI, or the like, first determine a predetermined condition for transmitting A-CSI, etc. The predetermined condition for preparing the CSI report transmission may be determined. In the present specification, the CSI report controller 1212 is described based on first determining a predetermined condition for transmitting the A-CSI and then determining a predetermined condition for preparing the CSI report transmission, but the technical spirit of the present invention is not limited thereto. no.

According to the first embodiment of the present specification, the CSI reporting controller 1212 determines whether simultaneous PUSCH and PUCCH transmission are configured.

i) PUSCH And PUCCH If simultaneous transmission is not set (Case 1)

If simultaneous PUSCH and PUCCH transmission is not configured, the CSI reporting controller 1212 performs the operation of Case 1 of the first embodiment. For example, when simultaneous PUSCH and PUCCH transmissions are not configured, the CSI reporting controller 1212 may determine a current subframe and a UB serving cell (the UB serving cell of a specific subframe in which PUSCH is scheduled to be transmitted according to an uplink grant). (E) Determine whether the CCA is successful.

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

As an example, when the CSI reporting controller 1212 prepares only A-CSI report transmission in a subframe in which PUSCH transmission is scheduled, the RF unit 1220 transmits A-CSI to the base station 1250 through the PUSCH on the UB serving cell. do.

As another example, when the CSI report control unit 1212 prepares for A-CSI report transmission in a subframe scheduled for PUSCH transmission, and the HARQ control unit 1214 prepares for A / N transmission, the RF unit 1220 receives A. -CSI and A / N are transmitted to the base station 1250 through the PUSCH on the UB serving cell.

If the (E) CCA is not successful, the CSI reporting controller 1212 prepares for report transmission such as A-CSI through another time resource on the UB serving cell or a frequency resource different from the UB serving cell. Here, another time resource may mean another subframe within a predetermined time after the current subframe. The other frequency resource may be a serving cell different from the UB serving cell in the UB or a serving cell in the LB.

According to an aspect, even if the PUSCH transmission is not possible due to channel occupancy failure in a subframe indicated by an uplink grant, if the CSI reporting controller 1212 determines that the uplink grant is valid for a predetermined time t, the uplink grant is valid. It may be determined that the CSI request in the grant is also valid. Therefore, the CSI reporting controller 1212 prepares for A-CSI report transmission through the UB serving cell when the CCA for the UB serving cell succeeds within a predetermined time t. In relation to the predetermined time t, the CSI reporting controller 1212 may start the predetermined time t when the PUSCH transmission fails due to channel occupancy 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 impossible due to the 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 report controller 1212 may prepare for A-CSI report transmission.

A detailed exemplary operation of the CSI reporting controller 1212 according to Case 1 of the first embodiment may include an operation of the terminal described with reference to FIGS. 4 to 6B.

ii) PUSCH And PUCCH Simultaneous transmission is set (Case 2)

If simultaneous PUSCH and PUCCH transmission is configured, the CSI reporting controller 1212 may perform the operation of Case 2 of the first embodiment. For example, when simultaneous PUSCH and PUCCH transmission is configured, the CSI reporting controller 1212 may perform a current subframe and a UB serving cell (dPfmf, for example, a UB serving cell of a specific subframe in which a PUSCH is scheduled to be transmitted according to an uplink grant). (E) Determine whether the CCA is successful. If the (E) CCA for the UB serving cell is successful, the CSI reporting controller 1212 prepares a report transmission of the A-CSI according to a predetermined condition, and the RF unit 1220 prepares the A-CSI on the UB serving cell. Transmit to the base station 1250 via the PUSCH. In this case, when 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, when only transmission of the A-CSI is triggered in a subframe in which PUSCH transmission is scheduled, the RF unit 1220 transmits the A-CSI to the base station 1250 through the PUSCH on the UB serving cell. As another example, when A-CSI reporting and A / N transmission are triggered in a subframe scheduled for PUSCH transmission, the RF unit 1220 transmits the A-CSI to the base station 1250 through the PUSCH on the UB serving cell. The A / N is transmitted to the base station 1250 through the PUCCH of the main serving cell or the PUCCH SCell.

If the CCA is not successful, the CSI reporting controller 1212 prepares for A-CSI report transmission on another time resource on the UB serving cell or on a frequency resource different from that of 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, It may be determined that the CSI request in the uplink grant is also valid. Accordingly, the CSI reporting controller 1212 may prepare for A-CSI report transmission through the UB serving cell when 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 impossible due to the 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 report controller 1212 may prepare for A-CSI report transmission through the other serving cell. In this case, the CSI reporting controller 1212 may select the other serving cell or the serving cell in the licensed band based on the priority determined by the index of each serving cell.

A detailed exemplary operation of the CSI reporting controller 1212 according to Case 2 of the first embodiment may include an operation of the terminal described with reference to FIGS. 7 to 9D.

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

Meanwhile, according to the second embodiment of the present specification, the CSI reporting controller 1212 determines whether simultaneous PUSCH and PUCCH transmission are configured.

i) PUSCH And PUCCH If simultaneous transmission is not set (Case 1)

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

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

ii) PUSCH And PUCCH Simultaneous transmission is set (Case 2)

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

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

The base station 1250 includes a memory 1255, a processor 1260, and an RF unit 1265.

The processor 1260 implements the functions, processes, and / or methods proposed herein. In more detail, the processor 1260 implements operations of the base station corresponding to all operations of the terminal 1200 described in the embodiments of FIGS. 3 to 10 disclosed herein. The memory 1255 is connected to the processor 1260 and stores various information for driving the processor 1260. The RF unit 1265 is connected to the processor 1260 to transmit and / or receive a radio signal. For example, the RF unit 1265 may receive A-CSI, A / N, SR from the terminal 1200, or may transmit an uplink grant and a PDSCH including a CSI request to the terminal 1200. More specifically, the RF unit 1265 transmits an UL grant for the PUSCH of the UB serving cell (serving cell or CC belonging to an unlicensed band) to the terminal 1200. Here, the uplink grant is downlink control information transmitted from the base station 1250 to the terminal 1200. The uplink grant may be

DCI format

0 or 4 and include a CSI request.

The processor 1260 recognizes that A-CSI transmission on a resource scheduled for the terminal 1200 has failed through blind decoding. The RF unit 1265 may receive an A-CSI report from the terminal 1200 using a PUSCH (if present) on another serving cell that is already promised, and the processor 1260 may base the A-CSI report on the received A-CSI report. Downlink scheduling for the terminal 1200 may be performed.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

It is intended that the scope of the invention be limited to software (or operating systems, applications, firmware, programs, etc.) that cause operations in accordance with various embodiments of the invention to be executed on a device or computer, and to store and execute such software on the device or computer. Possible mediums are included.

Various embodiments of the present invention have been described with reference to a 3GPP LTE or LTE-A system, but may be applied to various mobile communication systems.

Claims

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 configured, and is determined in an unlicensed band (UB) in the current subframe. 1, if the serving cell fails to occupy the channel, prepare to transmit aperiodic channel state information (A-CSI) report through another time resource of the first serving cell or a frequency resource different from that of the first serving cell. A processor;

Receives an uplink grant from the base station scheduling the PUSCH and requesting the A-CSI report, and based on whether the simultaneous transmission of the PUSCH and the PUCCH is configured, the A-CSI and Hybrid Automatic Repeat Request (HARQ) ACK / NACK RF unit (radio frequency unit) for transmitting a signal on the PUSCH at once, or transmits the A-CSI and the HARQ ACK / NACK signal divided into the PUSCH and the PUCCH; And

And a memory coupled to the processor to store information for driving the processor.
The method of claim 1,

The other time resource is another subframe within a predetermined time after the current subframe,

And the processor starts the predetermined time when the PUSCH transmission fails due to channel occupancy failure in the first serving cell.
The method of claim 1,

The other frequency resource is a terminal, characterized in that different from the first serving cell in the UB or a serving cell in a licensed band (LB).
The method of claim 3, wherein

The processor is characterized in that for selecting the other serving cell or the serving cell in the licensed band based on the priority determined by the index of each serving cell, the terminal.
A method of 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 from a base station scheduling the PUSCH and requesting aperiodic channel state information (A-CSI) reporting;

When the channel occupancy of the first serving cell in an unlicensed band (UB) fails in the current subframe, the A-CSI report is performed through another time resource of the first serving cell or a frequency resource different from the first serving cell. Preparing for transmission; And

The A-CSI and the HARQ (Hybrid Automatic Repeat Request) ACK / NACK signal are simultaneously transmitted on the PUSCH or the A-CSI and the HARQ ACK / NACK signal are based on whether the PUSCH and the PUCCH are simultaneously transmitted. And dividing and transmitting the PUSCH and the PUCCH.
The method of claim 5,

The other time resource is another subframe within a predetermined time after the current subframe,

And when the PUSCH transmission fails due to channel occupancy failure in the first serving cell, the predetermined time period begins.
The method of claim 5,

Wherein the other frequency resource is a serving cell different from the first serving cell in the UB or a serving cell in a licensed band (LB).
The method of claim 7, wherein

The other serving cell or a serving cell in the licensed band is selected based on a priority determined by an index of each serving cell.