WO2014157927A1 - Method for controlling transmission of uplink control information on plurality of serving cells, and apparatus therefor - Google Patents

Abstract

The present invention pertains to a method for transmitting uplink control information on a plurality of serving cells for supporting carrier aggregation technology between base stations, and an apparatus therefor. According to one embodiment of the present invention, the method for controlling, by a terminal, the transmission of uplink control information in a plurality of serving cells comprises the steps of: comparing K number of UCIs to be transmitted simultaneously and M, which is the number of UCIs enabled to be transmitted simultaneously so as to select M number among UCIs to be transmitted simultaneously when K is greater than M in the comparison results; and a step of transmitting the M number of UCIs through physical uplink control channel (PUCCH) of each serving cell to a base station. In addition, the M is characterized by being less than or equal to N number of serving cells, or greater than natural number 1.

Description

Method and apparatus for controlling transmission of uplink control information in a plurality of serving cells

The present invention relates to a method and apparatus for transmitting uplink control information of a plurality of serving cells for supporting carrier aggregation technology between base stations.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. The development of technology capable of transferring large amounts of data is required. As a method for transmitting a large amount of data, data can be efficiently transmitted using a plurality of cells.

Meanwhile, uplink transmission is performed in a plurality of cells or small cells, and a technique for controlling transmission of a channel of uplink control information is required.

The present invention to solve the above problems In the transmission of uplink control information, a technique and a method for controlling the transmission of each serving cell are proposed.

In order to solve the above problems, the method for controlling the transmission of uplink control information in a plurality of serving cells by the terminal according to an embodiment of the present invention compares the number of simultaneous transmission K and the number of UCI simultaneous transmission M, Selecting M of the UCIs to be transmitted simultaneously when the comparison result K is greater than M, and transmitting the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell, M is less than or equal to the number N of serving cells and is a natural number of 1 or more.

In a method for receiving uplink control information in a plurality of serving cells by a base station according to another embodiment of the present invention, a UCI of M or less, which is the number of UCI simultaneous transmissions, can be received from a terminal through a physical uplink control channel (PUCCH) of each serving cell. And confirming the UCI, wherein the number of UCIs to be transmitted simultaneously by the UE is greater than M, wherein at least one UCI smaller than K is transmitted through the PUCCH. It is characterized by being a natural number less than or equal to the number N of serving cells and one or more.

A terminal according to another embodiment of the present invention compares a receiving unit for receiving a signal from a base station, the number of UCIs to be transmitted simultaneously and M, which is the number of simultaneous UCI transmissions, and when the comparison result is greater than M, among the simultaneous transmissions of UCIs. A control unit for selecting M and a transmitter for transmitting the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell, wherein M is less than or equal to the number N of serving cells, and 1 Transmission of uplink control information is controlled by the plurality of serving cells, which is the above natural number.

A base station according to another embodiment of the present invention is a transmitting unit for transmitting a signal to the terminal, a receiving unit for receiving a UCI or less of the number of UCI simultaneous transmission from the terminal via PUCCH (Physical Uplink Control CHannel) of each serving cell, and the And a control unit for identifying a UCI, wherein when the number of UCIs simultaneously transmitted by the UE is greater than the M, one or more UCIs smaller than K are transmitted through the PUCCH, and M is the number N of serving cells. Receive uplink control information from a plurality of serving cells characterized in that it is less than or equal to and equal to or more than one natural number.

In the case of implementing the present invention, in the transmission of uplink control information, each serving cell is controlled to be transmitted independently.

1 illustrates an example network configuration scenario for the present invention.

2 shows another example of a network configuration scenario for the present invention.

3 is a diagram illustrating a part of a configuration of a higher layer RRC signaling message according to an embodiment of the present invention.

4 is a diagram illustrating a MAC CE according to an embodiment of the present invention. 4 shows a configuration of a MAC header and a MAC CE.

5 is a diagram illustrating a process of controlling transmission of uplink control information in a plurality of serving cells in a terminal according to an embodiment of the present invention.

6 is a diagram illustrating a process of a base station controlling transmission of uplink control information in a plurality of serving cells according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of a user terminal according to another embodiment.

8 is a diagram illustrating a configuration of a base station according to another embodiment.

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

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a comprehensive concept of a terminal in wireless communication. In addition to user equipment (UE) in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), SS in GSM, It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like. Hereinafter, in the present specification, the user terminal may be abbreviated as a terminal. Hereinafter, in the present specification, a user terminal may be referred to as a terminal for short.

A base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. Base Transceiver System, Access Point, Relay Node, Remote Radio Head, RRH, Radio Unit, Transmission Point, TP, Reception Point, RP, etc. It may be called in other terms.

In other words, in the present specification, a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU communication range.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc. become embodiments of the base station according to the configuration of the radio region. In ii), the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.

Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in systems such as LTE and LTE-Advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data. On the other hand, control information can also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

A wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal. antenna transmission system), a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.

In the following, downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal, and uplink refers to a communication or communication path from a terminal to multiple transmission / reception points. In downlink, a transmitter may be part of multiple transmission / reception points, 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 multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH. In addition, for convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the portion described as the PDCCH.

In addition, high layer signaling described in the present specification includes RRC signaling for transmitting RRC information including an RRC parameter.

An eNB, which is an embodiment of a base station, performs downlink transmission to terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

At this time, as described with reference to the drawings below, the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal may transmit an uplink signal to the RRH.

Prior to 3GPP LTE / LTE-Advanced Rel-11, carrier aggregation (or carrier aggregation, or 'CA') technology is one or more CC (Component Carrier, or element) configured by the base station to form a cell for any terminal Or a combination of CCs of small cells constructed using a low power remote radio head (RRH), which is a geographically dispersed antenna within the coverage of the macro cell and the macro cell CC, to increase the data rate.

In particular, the macro cell and the RRH cell are constructed to be scheduled under the control of one eNB for carrier aggregation technology, and for this purpose, an ideal backhaul was required between the macro cell node and the RRH. An ideal backhaul means a backhaul that exhibits very high throughput and very low latency, such as a dedicated point-to-point connection using optical fiber, line of sight (LOS) microware. In contrast, backhaul that exhibits relatively low throughput and large delay, such as digital subscriber line (xDSL) and non-LOS microwave, is called non-ideal backhaul.

In the LTE / LTE-Advanced system, the CCs operating based on independent center frequencies are referred to as one cell, which is constructed by a network operator such as one base station / eNB / RRH. It has a different meaning from the concept of geographic / physical cell formed through one transmitting node. In the present invention, the cell concept is distinguished by context.

In a carrier merging operation for a terminal, a CC corresponding to a serving cell to which the terminal enters when the terminal enters an initial network entry / re-entry is a primary cell. Information related to secondary cells, which can be additionally merged according to the capability of the UE through the corresponding primary cell, is set by RRC signaling, and a MAC CE (Control Element) message is subsequently added. The carrier merging technique is applied to a structure in which a cell to be merged by a corresponding UE among secondary cells configured through the RRC signaling is activated or deactivated.

As described above, when carrier aggregation is applied to any UE in a 3GPP LTE / LTE-Advanced Rel-11 or lower system, even if cells have independent center frequencies, carrier aggregation based on a single scheduling unit is applied. PUCCH resources for uplink control information (UCI) transmission of the UE to which the carrier aggregation is applied are configured only through the primary cell among the merged serving cells. Accordingly, when a carrier aggregation applied UE transmits UCI, the UE transmits through the PUCCH resources of the primary cell or the primary according to configuration information about PUCCH / PUSCH simultaneous (PUCCH / PUSCH simultaneous). A PUSCH transmission resource of a cell or a PUSCH transmission resource of a secondary cell is transmitted.

As shown in FIG. 1 below, any terminal 130 located in an area where respective cells formed by two or more different base stations (eNB / RU / RRH / eNodeB, etc. may be variously referred to) 110 and 120 overlap each other. In order to increase the data rate of the terminal 130, the carriers between the base stations used for data transmission and reception may be merged by merging the frequency bands supported by the base stations 110 and 120. However, in FIG. 1, a cell type formed by each of the base stations 110 and 120 may be a macro cell, a small cell (eg, a pico cell, a micro cell, etc.) or a femtocell according to its coverage. femto cell) and the like.

As a typical scenario that requires the application of such a carrier aggregation technology between base stations, as shown in FIG. 2, carriers between small cells formed by overlapping with macro cells may be merged.

2 shows another example of a network configuration scenario for the present invention.

Small cells formed by low power base stations that use lower transmit (Tx) power than conventional macro base stations cover cells of smaller size than macro cells, thus increasing spatial spatial recyclability compared to macro cell based network structures. In addition, it is advantageous in handling the high data rate of a local area such as a hot spot where data traffic is introduced when overlapped with a macro cell. However, the introduction of small cells intensifies the inter-cell interference problem, and in particular, in a heterogeneous network scenario in which macro and small cells overlap with each other using the same frequency band, the macro cell and the small cell are small. Inter-cell interference can cause severe performance degradation.

Accordingly, there is a need for a small cell enhancement scheme for minimizing interference between a macro cell and a small cell while increasing the data rate of a specific local area through the introduction of a low power base station. As an embodiment for improving a small cell, as shown in FIG. 2, in an environment in which frequency bands of the macro cell and the small cell are used differently, each of the terminals 230 belonging to the small cell coverage may respectively use the macro cell through the frequency band F1 of the macro cell. Supporting inter-eNB Carrier Aggregation, which is also connected to the small cell base station 220 through the small cell frequency band (F2) in the state of establishing a connection with the base station 210. Plans are being discussed.

However, when the ideal backhaul is not established between the macro base station and the small cell base station as shown in FIG. 2, that is, when the non-ideal backhaul is established between the macro base station and the small cell, inter-eNBs based on the existing carrier merging operation scheme are inter -eNB) Carrier merge technology becomes difficult to apply. In particular, when the UE merges the small cell carrier F2 into the secondary cell while the UE is holding the macro cell carrier F1 as the primary cell, when the UE is applied to the UE, the UCI is transmitted to the primary cell as in the past. HARQ operation and radio channel based scheduling become difficult to apply.

More generally, when the respective frequency bands supported by the base stations are merged and used for a terminal located in an inter-cell overlapping area formed by any two or more base stations as shown in FIG. 1, the corresponding base station In the non-ideal backhaul environment where the backhaul delay times exist, the above-described problems apply equally.

The present invention supports dual connectivity with neighboring base stations in an arbitrary terminal located in a region where coverage between neighboring base stations (eNB / RRH / RU) overlaps in a 3GPP-based wireless mobile communication system. Suggest ways to do this. In particular, when the neighboring base stations use different frequency bands, the terminal and the base station for supporting the inter-eNB Carrier Aggregation technology that uses the frequency bands supported by the neighboring base stations in the terminal It relates to the operation method of.

The present invention proposes a UCI transmission scheme of a terminal for applying a carrier aggregation technique between base stations under a non-ideal backhaul based on a rather long backhaul delay time between base stations as shown in FIG. 1. In particular, the present invention focuses on a UCI transmission scheme for a carrier merge terminal for additionally merging F2, which is a small cell carrier, in a carrier merge scenario between the macro cell and the small cell as shown in FIG. 2. Although described in detail, it is obvious that the proposed technique can be equally applied to the general inter-base station carrier aggregation scenario shown in FIG. 1. Alternatively, the contents of the present invention may be equally applied to a scenario of applying a merge technology between a plurality of carriers supported by one base station. In addition, the description will be given on the assumption that there is only one carrier supported by each of the neighboring base stations, but the same scheme may be applied to any N (where N is any natural number) carriers without being limited to one. . That is, in the case of merging additional one or N-1 additional secondary CCs in addition to the primary CC which is currently connected from the UE perspective, the invention described below in merging each secondary cell The proposed content of can be equally applied.

According to a carrier merging technique defined in a 3GPP LTE / LTE-Advanced Rel-11 or lower system, a PUCCH resource that is an uplink control channel in case of a terminal using a plurality of carriers, that is, a terminal in which a plurality of serving cells are configured, is used. Is allocated only in a primary cell among serving cells configured for the corresponding UE. However, the term "cell" herein means one component carrier, and in the present invention, the cell and the component carrier (CC) are used together. That is, when the uplink control information is transmitted, the UE transmits the data through the PUSCH which is the uplink data channel of the primary cell or the secondary cell or through the PUCCH of the primary cell.

In the present invention, when a carrier merges in a 3GPP LTE / LTE-Advanced Rel-12 system or a subsequent system, a new proposal for a method of transmitting uplink control information of an applicable terminal is proposed. In particular, unlike the carrier aggregation scenario in the system of the existing LTE / LTE-Advanced Rel-11 or less, more diverse carrier aggregation scenarios are considered in Rel-12 and subsequent systems. As an example of this, in an environment in which an ideal backhaul line is not secured between base stations, a base station (or inter-eNB, inter-eNB) in which a terminal located in a coverage overlap area of a neighboring base station establishes a connection with corresponding neighboring base stations through different carriers, respectively. -eNB) carrier aggregation is also considered as one of the scenarios. As such various carrier aggregation scenarios are considered, the uplink control information transmission scheme applied in the single base station based carrier aggregation scenario in the existing Rel-11 or lower system and the new uplink control information transmission scheme applicable to other new carrier aggregation scenarios You may need to design for. As an example of this, the Rel-12 system or a subsequent system may be configured to transmit uplink control information independently for each serving cell. Alternatively, each serving may be performed according to a base station / eNB constituting a corresponding serving cell for a plurality of serving cells merged in an arbitrary terminal (classifying a master eNB and a secondary eNB according to whether or not an RRC connection is established). By grouping cells, one cell may be selected for each serving cell group, and uplink control information may be transmitted for each serving cell group through the uplink of the selected cell. To this end, in case of Rel-12 or subsequent UEs, whether to apply the carrier aggregation-based UCI transmission method defined in the existing LTE / LTE-Advanced Rel-11, or apply the new UCI transmission method to transmit UCI independently for each serving cell. An indicator regarding a UCI transmission method for setting whether or not to be defined may be defined and may be transmitted to a corresponding UE through MAC CE signaling or UE-specific RRC signaling when the carrier is merged. Alternatively, Rel-12 or subsequent UEs can be defined to transmit UCI independently for each serving cell, or when adding or activating a secondary cell, whether to allocate PUCCH resources for the secondary cell in a corresponding carrier merging situation. UCI transmission scheme can be defined.

As such, the UCI transmission scheme for each serving cell for the Rel-12 UE may be configured differently from the UCI transmission scheme in the existing Rel-11 carrier aggregation. In the present invention, it is assumed that the UCI transmission method in Rel-12 carrier aggregation is newly defined, but the above-described method of setting Rel-12 UCI transmission for each terminal is not limited.

The present invention looks at the UCI transmission scheme of the terminal when it is necessary to simultaneously transmit the UCI over a plurality of serving cell uplink for the terminal configured to comply with the new UCI transmission scheme for Rel-12.

In a first embodiment , the UCI of a serving cell (Component Carrier) having an upper (or lower) lower carrier indicator field (CIF ) is dropped.

In the first embodiment, UCI for any two or more serving cells among the corresponding serving cells is simultaneously generated for any UE that merges and uses N serving cells, thereby serving each serving cell through the same uplink subframe. If UCI needs to be transmitted, the UCI of the serving cell having the lowest CIF value may be transmitted, and the UCI transmission for the remaining serving cells may be defined to drop.

That is, when PUCCH resources are allocated to each serving cell for a UE that merges and uses any N serving cells, the UE independently transmits uplink control information (UCI) for each serving cell. For example, when a base station activates CC # 2 as a secondary cell for any UE operating by holding CC # 1 as the primary cell, PUCCH resource allocation information for the corresponding CC # 2 is common for the UE. When configured by RRC signaling and dedicated RRC signaling, the UE independently transmits uplink control information (UCI) for each serving cell. That is, UCI such as HARQ ACK / NACK feedback for downlink data transmission of primary cell or CQI feedback and scheduling request (SR) for primary cell may be performed through PUCCH resource or PUSCH of uplink subframe of primary cell. The UCI for the secondary cell is transmitted through the PUCCH resource or the PUSCH of the secondary cell. At this time, if UCI transmission for the corresponding primary cell and UCI transmission for the secondary cell occur at the same time, and the corresponding terminal does not support simultaneous transmission of uplink through different CCs or serving cells, the corresponding UE has a low CIF. The UCI of the primary cell, which is the serving cell, is transmitted first, and the UCI of the remaining secondary cells is dropped. In another embodiment, the UCI of the primary cell of the high CIF serving cell may be preferentially transmitted, and the UCI of the remaining secondary cells except for this may be dropped.

That is, CC # 1 is a primary cell (CIF value = 0) and CC # 2, ..., CC #N for a UE using N CCs merged up to CC # 1, ..., CC #N. When the secondary cell is configured to have a CIF value in ascending order, when the UCI for a plurality of serving cells among the corresponding serving cells is to be transmitted through the same uplink subframe, the UE is the smallest CIF among the CIFs of the serving cell. Only the UCI of the serving cell having the value is transmitted through the PUCCH or the PUSCH of the corresponding serving cell and the remaining UCI is dropped. Further extending the first embodiment, it is possible to drop the UCI of the secondary cell rather than the primary cell. Alternatively, if the number of uplink simultaneous transmissions supported by the terminal is M, and the M is less than the number of simultaneous UCI transmissions generated by the terminal at any moment, K, the first embodiment may be extended. The CIF may be defined to select M from small serving cells to transmit UCI.

As described above, each serving cell is grouped according to the base station / eNB constituting the serving cell with respect to the serving cells merged in an arbitrary terminal, and one serving cell is selected for each serving cell group, and then each serving cell group is upward. Even when the link control information is defined to be transmitted separately, the CIF-based uplink control information transmission serving cell selection scheme may be applied. That is, the priority of uplink control information transmission may be defined according to the CIF value of the serving cells selected to transmit uplink control information for each serving cell group. For example, for any terminal in which five serving cells are merged up to CC # 1, CC # 2, ......, CC # 5, among the corresponding five serving cells, CC # 1, CC # 2 Is a serving cell configured by the first base station / eNB, and CC # 3, CC # 4, CC # 5 is a serving cell configured by the second base station / eNB having a separate scheduler from the first base station / eNB, CC # 1, CC # 2) is configured as one first serving cell group, and the corresponding (CC # 3, CC # 4, CC # 5) is configured as another second serving cell group, The uplink control information for the 1 serving cell group is transmitted through an uplink subframe of CC # 1, and the uplink control information for the second serving cell group is transmitted through an uplink subframe of CC # 3. Can be. At this time, the uplink control information transmission for the first serving cell group and the uplink control information transmission for the second serving cell group occur simultaneously in the corresponding CC # 1 and CC # 3, and the corresponding terminal simultaneously transmits the uplink. When the transmission is not supported, only uplink control information of a serving cell group having a small (or large) CIF value according to the CIF values of CC # 1 and CC # 3 may be defined to be transmitted at a corresponding moment. Alternatively, when defining each serving cell group, priority for uplink control information transmission may be defined in the serving cell group itself. That is, in the above example, the first base station / eNB constituting the serving cell group consisting of (CC # 1, CC # 2) and the serving cell group consisting of (CC # 3, CC # 4, CC # 5) Priority of each of the first serving cell group and the second serving cell group may be determined by the second base station / eNB. For example, a serving cell group configured by a base station / eNB to which a corresponding carrier aggregation terminal has an RRC connection is referred to as a master cell group, and a serving cell group configured by another base station / eNB is referred to as a secondary cell group. (secondary cell group) or a serving cell group configured by a macro cell base station / eNB or a serving cell group configured by a small cell base station / eNB. The group may be defined and may be defined to have priority over the uplink control information transmission for the serving cells constituting the secondary cell group with respect to the transmission of the uplink control information for the serving cells constituting the master cell group.

Priority ( U) of each UCI type that is commonly applied to serving cells configured as the second embodiment is defined.

In a second embodiment, the priority of each UCI may be defined, and the highest priority UCI may be transmitted through the corresponding serving cell. That is, when a carrier aggregation terminal needs to transmit an uplink subframe of each serving cell to UCI for a plurality of serving cells at the same time, a serving cell to transmit UCI may be selected according to the type of UCI for each serving cell. have. As an example of priority setting according to the UCI type, the priority of HARQ ACK / NACK feedback for downlink data transmission may be set highest, followed by SR and CQI / CSI feedback. As such, when the priority for each UCI is set, the highest priority UCI is transmitted through the PUCCH or the PUSCH of the corresponding serving cell, and the remaining UCI is dropped. In addition, when the UCI having the highest priority occurs in the plurality of serving cells, it is possible to determine whether to transmit the corresponding high priority according to the scheme described in the first embodiment. Extending the second embodiment, if the number of uplink simultaneous transmissions supported by the terminal is M, and the M is less than the number of simultaneous UCI transmissions occurring in the terminal at any moment, K, the corresponding K serving cells are transmitted. Among UCIs to be selected, M UCIs having a high priority may be selected and defined to be transmitted in corresponding M serving cells.

In a third embodiment, a simultaneous UCI transmission indicator for each secondary serving cell is defined.

Simultaneous UCI Tx indicator may be defined according to the capability of the terminal and the uplink channel environment of the terminal. The simultaneous UCI transmission indicator is a parameter set for each secondary serving cell when each (secondary) serving cell (CC) is activated.The CIF of the secondary cell is lower than the CIF value of the primary cell or the secondary cell. This parameter configures whether the secondary cell having the value can be performed simultaneously with the transmission of the UCI. That is, when activating any secondary cell, it may be defined to transmit a simultaneous UCI transmission indicator together with PUCCH resource allocation information in the secondary cell. When the simultaneous UCI transmission indicator is configured, the UE simultaneously sets UCI of the secondary cell through UCI transmission of a secondary cell having a UCI of a primary cell or a lower CIF value and PUCCH or PUSCH of a secondary cell uplink subframe. Can transmit If the secondary serving cell for which the corresponding simultaneous UCI transmission indicator is not set, the secondary serving cell when UCI transmission occurs in a secondary cell having a lower primary cell or a lower CIF value according to the first embodiment described above Drops UCI transmissions from. Alternatively, according to the second embodiment, the UCI should be transmitted only when the priority of the UCI to be transmitted in the primary cell or the secondary cell having a lower CIF value is lower than the priority of the UCI to be transmitted in the secondary serving cell. If not, you can drop it.

In the fourth embodiment, the number of simultaneous UCI Tx configuration is set.

As a method similar to the third embodiment, when activating or de-activating a specific secondary cell, an additional " number of simultaneous UCI Tx " can be additionally set and transmitted to the UE. The information is an information area indicating the number of serving cells that can simultaneously transmit UCI in the UE, and the UE can simultaneously transmit UCI in the serving cells corresponding to the set number. That is, if the corresponding simultaneous UCI transmission count information area is set to M (any natural number less than or equal to N) for a UE that merges and uses any N CCs, the UE may simultaneously transmit UCI in up to M serving cells. Can be. However, in this case, when the cell that needs to simultaneously transmit UCI exceeds M, M serving cells for transmitting UCI may be selected by Method 1 or Method 2 above. For example, if an arbitrary terminal merges five serving cells (CCs) and uses an information area of the corresponding simultaneous UCI transmission number of 2, the corresponding UE uses UCI through uplink subframes of up to two serving cells. Can be transmitted simultaneously. In this case, if three or more serving cells need to transmit UCI at the same time, UCI is transmitted through two serving cells having a small CIF value according to the scheme 1, and the UCI of the other serving cell is dropped, or according to the scheme 2 Two serving cells to transmit UCI may be selected according to the priority of UCI to be transmitted in each serving cell.

However, the UCI dropping rule described in the above four embodiments is applied only when transmitted through the PUCCH, and UCI transmission through the PUSCH can always be allowed. That is, in the above example, when it is necessary to simultaneously transmit UCI in a plurality of serving cells, the UCI dropping rule is not applied to the serving cell capable of UCI transmission through the PUSCH, and the UCI for the serving cell is transmitted through the PUSCH. Can transmit That is, when simultaneous PUSCH / PUCCH transmission is not configured in a serving cell to which a PUSCH resource is allocated, the corresponding UE does not apply the UCI dropping rule and piggybacks the corresponding PUSCH to transmit the UCI. The dropping rule may be applied only to serving cells that need to transmit UCI over PUCCH (that is, when PUSCH resources are not allocated or simultaneous PUSCH / PUCCH transmission is configured). At this time, in the new UCI transmission method of Rel-12 or higher, secondary cells may be forced not to allow simultaneous PUSCH / PUCCH transmission. That is, when the PUSCH resource is allocated to the secondary cells, it may be defined to always piggyback on the PUSCH and transmit the secondary cell.

When a UCI transmission method is defined in LTE / LTE-Advanced Rel-12 or a subsequent system according to the above scheme, when a new parameter is introduced (Method 3 or Scheme 4), the parameter is defined as a newly defined MAC CE signaling. Alternatively, an information area may be defined for transmission to a corresponding UE through UE-specific RRC signaling or for transmitting a corresponding parameter to existing MAC CE signaling or UE-specific RRC signaling.

3 is a diagram illustrating a part of a configuration of a higher layer RRC signaling message according to an embodiment of the present invention.

In FIG. 3, reference numeral 310 denotes an element related to configuration of a secondary cell among an RRCConnectionReconfiguration message. In step 310, the information on the cell to be a candidate may be included as a simultaneous UCI transmission indicator of the cell, such as sCellUCI_SimultaneousTxIndicator 315. In 315, sCellUCI_SimultaneousTxIndicator may indicate that simultaneous UCI transmission of the secondary cell is True / False.

Referring to MAC CE based indication, in order to indicate simultaneous UCI transmission of a corresponding cell, corresponding indication information may be transmitted through MAC CE signaling activating carrier aggregation for a corresponding secondary cell. When transmitting MAC CE signaling for activating a specific secondary cell among candidate secondary cells with respect to any terminal supporting carrier aggregation, simultaneous UCI transmission indication information for the corresponding cell may be included. Accordingly, the UE may determine the UCI transmission scheme for the secondary cell according to the simultaneous UCI transmission indication of the cell included in the MAC CE signaling activated by the secondary cell.

4 is a diagram illustrating a MAC CE according to an embodiment of the present invention. 4 shows a configuration of a MAC header and a MAC CE.

Table 1 Configuration of MAC Headers and Subheaders

index	LCID value
00000	CCCH
00001-01010	Identity of the logical channel
01011-11010	Reserved
11011	Activation / Deactivation
11100	UE Content Resolution Resolution Identity
11101	Timing Advance Command
11110	DRX Command
11111	Padding

Looking at the octet configuration of the MAC header and subheader as shown in Table 1, the LCID value of the activated / deactivated MAC CE is 11011. An embodiment of the MAC subheader indicating this is indicated by reference numeral 410 of FIG. 4. The MAC subheader for activating or deactivating the secondary cell is equal to 410.

According to an embodiment of the present invention, since the MAC CE includes information indicating simultaneous UCI transmission, the last reserved bit is set to 1, such as "00001001" of reference numeral 420. 421 is set to '1' to activate the cell at SCellIndex 3, and the bit indicated by reference number 429 is also set to '1' so that UCI transmission at the secondary cell at SCellIndex 3 is performed simultaneously. Can be directed. As described above, an embodiment of the present invention may be applied to one or more, for example, a plurality of secondary cells, and SCellIndex is set to 2 when the MAC CE indicated by 420 is activated and is set to “00010101”. And a cell of 4, and since the last reserved bit is '1', it may indicate that simultaneous UCI transmission is performed for the activated cell. In the above example, it may be indicated for each cell using a bit other than the last reserved bit or an area of a separate MAC payload.

We propose a new UCI transmission scheme applicable to a carrier aggregation terminal in Rel-12 or a subsequent system. In particular, when a scheduler for each serving cell is distributed according to various scenarios such as inter-eNB carrier merging and dual connectivity based carrier merging with small cells, UCI is independently transmitted for each serving cell. There is a need to do it. In this case, by providing a terminal and base station operation scheme for the case that it is necessary to transmit the UCI to a plurality of serving cells at the same time, it provides a scheme for solving the ambiguity of the terminal and base station in the UCI transmission and reception.

Hereinafter, when a scheduler for each serving cell is distributed in an eNB-carrier aggregation and a dual connectivity-based carrier aggregation environment with a small cell, an uplink control channel transmission process for independently transmitting a UCI for each serving cell will be described.

5 is a diagram illustrating a process of controlling transmission of uplink control information in a plurality of serving cells in a terminal according to an embodiment of the present invention.

In order to control the transmission of uplink control information in a plurality of serving cells by the UE including Embodiments 1, 2, 3, and 4, the UE first compares the number K of UCIs to be transmitted simultaneously and the number M of UCIs that can be simultaneously transmitted (S510). . If the comparison result K is greater than M, the terminal selects M of the UCIs to be transmitted simultaneously (S520). As described in the first and second embodiments, the UCI of the serving cell having the lowest CIF may be selected, or a priority set according to the priority of the UCI, for example, the type of the UCI. Previously, HARQ ACK / NACK feedback for downlink data has been set to high priority, and SR and CQI / CSI feedback have been set to low priority. That is, the UE may select the UCI based on the Carrier Indicator Field (CIF) of the serving cell among the K UCIs according to the first and fourth embodiments. In addition, the UE may select based on the priority set in the UCI among the K UCIs using the second embodiment and the fourth embodiment. When applied to Example 1/2, the M may be 1, in which case, the UE may select one UCI.

In addition, when the serving cell is divided into a plurality of serving cell groups, the terminal may select based on the CIF of the serving cells in which uplink control information of each serving cell group is transmitted.

In more detail, when the serving cell is divided into two or more serving cell groups, the selecting of the S520 may be performed based on a step of defining differential priority for each serving cell group and priority for each serving cell group. It includes a step. The step of defining the priority may be implemented so that the priority definition of the master cell group is higher than the priority of the secondary cell group in defining the priority for each cell group for uplink control information transmission. have. This gives priority to the cell group itself, and when setting the CIF independently for each cell group, for example, set 0, 1, 2, ... to CIF for CCs constituting the master cell group in turn, The CCs constituting the secondary cell group may also be applied to the case where the CIF is set to 0, 1, 2, ... in order.

The terminal transmits the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell (S530). In this process, the third embodiment may be applied to select a UCI in which a simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmit the same through a PUCCH or a PUSCH of a serving cell of the UCI. For example, when M is 1 and K is 2, the lowest CIF or UCI with high priority is selected and transmitted to PUCCH, and UCI with simultaneous UCI transmission indication set as shown in FIG. 3 or 4 is PUCCH of the serving cell. Alternatively, it may be transmitted through the PUSCH. The UE may receive the RCI signaling method of FIG. 3 or the MAC signaling of FIG. 4 as a method of configuring a UCI simultaneous Tx indicator for the secondary cell from the base station.

In the embodiment of FIG. 5, M is a natural number that is less than or equal to the number N of serving cells and is 1 or more. In addition, the terminal may receive the M value from the base station. That is, the information on the M may be received from the base station by RRC or MAC signaling.

In addition, the UE may exclude one or more UCI set to be transmitted in the PUSCH of the UCI in the selecting step. This is because there is no need to transmit on the PUCCH. In addition, the secondary UCI of the UCI may be transmitted to the piggyback (piggyback) on the PUSCH resource allocated to the terminal.

6 is a diagram illustrating a process of a base station controlling transmission of uplink control information in a plurality of serving cells according to an embodiment of the present invention.

The base station receives UCI of M or less, which is the number of UCI simultaneous transmissions, from the terminal through a physical uplink control channel (PUCCH) of each serving cell (S610). The UCI below M are UCIs selected by the UE performing the process of FIG. 5. The base station checks the received UCI (S620). When the number of simultaneous UCIs K is greater than M, the UE transmits one or more UCIs smaller than K through the PUCCH, wherein M is a natural number equal to or smaller than N and the number of serving cells. In this case, the base station receives the UCI selected by the terminal.

Meanwhile, the base station may transmit the UCI simultaneous transmission indicator to the terminal in the third embodiment. That is, the base station transmits the simultaneous UCI transmission indicator for the secondary cell to the terminal by RRC or MAC signaling, an embodiment thereof has been described with reference to FIGS. 3 and 4. In order to transmit the number of simultaneous UCI transmissions M of the fourth embodiment, the base station may transmit information about the M to the terminal through RRC or MAC signaling. Also, the base station may receive a UCI of a secondary cell among the UCIs as a piggyback on PUSCH resources allocated to the UE.

Hereinafter, when a scheduler for each serving cell is distributed in an eNB-carrier aggregation and a dual connectivity-based carrier aggregation environment with a small cell, a terminal and a base station for controlling uplink control channel transmission that independently transmits UCI for each serving cell Let's look at the configuration.

7 is a diagram illustrating a configuration of a user terminal according to another embodiment.

Referring to FIG. 7, the user terminal 700 according to another embodiment includes a receiver 730, a controller 710, and a transmitter 720.

The receiver 730 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the controller 710 may be configured to serve each serving cell when a scheduler for each serving cell is distributed in an inter-eNB carrier merge and a dual connectivity based carrier merge environment with a small cell required to perform the above-described present invention. To control the overall operation of the terminal according to the independent transmission of each UCI.

The transmitter 720 transmits uplink control information, data, and a message to a base station through a corresponding channel.

In more detail, in order to control the transmission of uplink control information in a plurality of serving cells by the UE including Embodiments 1, 2, 3, and 4, the control unit 710 may first transmit the number of UCIs and the number of UCIs that can be simultaneously transmitted. For comparison, if K is greater than M, M is selected among the simultaneous transmission UCI. As described above in the first and second embodiments, the controller 710 selects the UCI of the serving cell having the lowest CIF, or selects the priority set according to the priority of the UCI, for example, the type of the UCI. Can be. Alternatively, the UCI of the serving cell having the highest CIF may be selected. Previously, HARQ ACK / NACK feedback for downlink data has been set to high priority, and SR and CQI / CSI feedback have been set to low priority. That is, the UE may select the UCI based on the Carrier Indicator Field (CIF) of the serving cell among the K UCIs according to the first and fourth embodiments. In addition, the controller 710 may select the K UCI based on the priority set in the UCI using the second and fourth embodiments. When applied to Embodiment 1 or Embodiment 2, M may be 1, in which case, the UE may select one UCI.

In addition, when the serving cell is divided into a plurality of serving cell groups, the controller 710 may select based on the CIF of the serving cells in which uplink control information of each serving cell group is transmitted.

In more detail, the serving cell is divided into two or more serving cell groups, and the control unit 710 may define differential priorities for each serving cell group, and select the serving cells based on the priority of each serving cell group. . In addition, in order to define the priority, the control unit 710 prioritizes the priority of the master cell group over the priority of the secondary cell group in defining the priority for each cell group for uplink control information transmission. It can be implemented to be definition. This gives priority to the cell group itself, and when setting CIF independently for each cell group, for example, set 0, 1, 2, ... to CIF for CCs constituting the master cell group, The CCs constituting the secondary cell group may also be applied to the case where the CIF is set to 0, 1, 2, ... in order.

The transmitter 720 transmits the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell (S530). In this process, the third embodiment may be applied to select a UCI in which a simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmit the same through a PUCCH or a PUSCH of a serving cell of the UCI. For example, when M is 1 and K is 2, the lowest CIF or UCI with high priority is selected and transmitted to PUCCH, and UCI with simultaneous UCI transmission indication set as shown in FIG. 3 or 4 is PUCCH of the serving cell. Alternatively, it may be transmitted through the PUSCH. The receiver 730 may receive the RRC signaling method of FIG. 3 or the MAC signaling of FIG. 4 so that the UE sets a simultaneous UCI Tx indicator for the secondary cell from the base station.

In the embodiment of FIG. 5, M is a natural number that is less than or equal to the number N of serving cells and is 1 or more. In addition, the terminal may receive the M value from the base station. That is, the information on the M may be received from the base station by RRC or MAC signaling.

In addition, the control unit 710 may exclude one or more UCI set to be transmitted in the PUSCH of the UCI in the selecting step. This is because there is no need to transmit on the PUCCH. In addition, the transmitter 720 may transmit the secondary UCI among the UCI to the piggyback on the PUSCH resource allocated to the terminal.

8 is a diagram illustrating a configuration of a base station according to another embodiment.

Referring to FIG. 8, the base station 800 according to another embodiment includes a controller 810, a transmitter 820, and a receiver 830.

The controller 810 independently transmits UCI for each serving cell when a scheduler for each serving cell is distributed in an eNB-carrier aggregation between eNBs and a dual connectivity-based carrier aggregation environment for implementing the above-described invention. To control the overall operation of the base station. The transmitter 1020 and the receiver 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

The receiving unit 830 of the base station receives UCI of M or less, which is the number of UCI simultaneous transmissions, from the terminal through the physical uplink control channel (PUCCH) of each serving cell. The UCI below M are UCIs selected by the UE performing the process of FIG. 5. The control unit 810 of the base station checks the received UCI. When the number of simultaneous UCIs K is greater than M, the UE transmits one or more UCIs smaller than K through the PUCCH, wherein M is a natural number equal to or smaller than N and the number of serving cells. In this case, the receiver 730 of the base station receives the UCI selected by the terminal.

Meanwhile, the transmitter 820 of the base station may transmit the UCI simultaneous transmission indicator to the terminal in the third embodiment. That is, the transmitter 820 transmits the simultaneous UCI transmission indicator for the secondary cell to the terminal through RRC or MAC signaling. An embodiment thereof has been described with reference to FIGS. 3 and 4. In order to transmit the number of simultaneous UCI transmissions M according to the fourth embodiment, the transmitter 820 may transmit information about the M to the terminal through RRC or MAC signaling. In addition, the receiver 830 may receive a UCI of a secondary cell among the UCIs as a piggyback on the PUSCH resource allocated to the UE.

According to the embodiment of the present invention, as described in Embodiments 1, 2, 3, and 4, a low CIF may be selected first or a high CIF may be selected in selecting a serving cell.

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.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is related to the patent application No. 10-2013-0033867 filed in Korea on March 28, 2013 and the patent application No. 10-2013-0155297 filed in Korea on December 13, 2013. Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (20)

1. In the method for the terminal to control the transmission of the uplink control information in a plurality of serving cells,

   Comparing the number K of simultaneous UCIs and M, the number of UCI simultaneous transmissions, and selecting M of the simultaneous UCIs when K is greater than M; And

   Transmitting the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell,

   M is less than or equal to the number N of serving cells and is a natural number greater than one.
2. The method of claim 1,

   The selecting may include selecting based on a carrier indicator field (CIF) of a serving cell among the K UCIs.
3. The method of claim 1,

   The serving cell is divided into two or more serving cell groups,

   The selecting may be performed based on the CIF of the serving cells in which uplink control information of two or more serving cell groups is transmitted, or

   A method for defining differential priority for each serving cell group and selecting based on the priority for each serving cell group.
4. The method of claim 1,

   The selecting is characterized in that the selection based on the priority set in the UCI of the K UCI.
5. The method of claim 1,

   The transmitting may include selecting a UCI in which simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmitting the same through a PUCCH or a Physical Uplink Shared CHannel (PUSCH) of a serving cell of the UCI.
6. The method of claim 5,

   Receiving from the base station a simultaneous UCI transmission indicator for a secondary cell by RRC or MAC signaling.
7. The method of claim 1,

   One or more UCIs configured to be transmitted in a PUSCH among the UCIs are excluded from the selecting step.
8. The method of claim 1,

   Method of transmitting the UCI of the secondary cell (Secondary Cell) of the UCI to the piggyback on the PUSCH resource allocated to the terminal.
9. In the method for the base station to receive the uplink control information in a plurality of serving cells,

   Receiving a UCI of less than or equal to the number of UCI simultaneous transmission from the terminal through the PUCCH (Physical Uplink Control CHannel) of each serving cell; And

   Identifying the UCI,

   When the number of UCIs simultaneously transmitted by the UE is greater than M, one or more UCIs smaller than K are transmitted through the PUCCH, wherein M is a natural number equal to or less than N and the number of serving cells. Characterized in that the method.
10. The method of claim 9,

    The base station is characterized in that for receiving the UCI of the secondary cell (Secondary Cell) of the UCI as a piggyback on the PUSCH resource allocated to the terminal.
11. Receiving unit for receiving a signal from the base station;

    A control unit for comparing the number K of UCIs to be transmitted simultaneously with M, which is the number of UCI simultaneous transmissions, and selecting M of the UCIs to be transmitted simultaneously if K is greater than M; And

    It includes a transmitter for transmitting the selected M UCI to the base station through the PUCCH (Physical Uplink Control CHannel) of each serving cell,

    The M is a terminal for controlling the transmission of uplink control information in a plurality of serving cells, characterized in that less than or equal to the number of serving cells N is a natural number of one or more.
12. The method of claim 11,

    The control unit is characterized in that for selecting based on the carrier indicator field (CIF) of the serving cell of the K UCI.
13. The method of claim 11,

    The serving cell is divided into two or more serving cell groups,

    The controller selects based on the CIF of the serving cells in which uplink control information of two or more serving cell groups is transmitted, or

    The control unit defines a differential priority for each serving cell group, and selects based on the priority of each serving cell group.
14. The method of claim 11,

    The control unit is characterized in that for selecting based on the priority set in the UCI among the K UCI.
15. The method of claim 11,

    The transmitter selects a UCI in which simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmits it through PUCCH or PUSCH (Physical Uplink Shared CHannel) of the serving cell of the UCI.
16. The method of claim 15,

    The receiving unit is characterized in that for receiving the simultaneous UCI transmission indicator for the secondary cell from the base station by RRC or MAC signaling.
17. The method of claim 11,

    The control unit excludes from the selection one or more UCI configured to transmit in the PUSCH of the UCI.
18. The method of claim 11,

    The UE characterized in that the transmitting unit transmits the UCI of the secondary cell (Secondary Cell) of the UCI from the PUSCH resource allocated to the terminal to the piggyback (piggyback).
19. Transmitter for transmitting a signal to the terminal;

    Receiving unit for receiving UCI or less of the number of UCI simultaneous transmission from the terminal through the PUCCH (Physical Uplink Control CHannel) of each serving cell; And

    It includes a control unit for identifying the UCI,

    When the number of UCIs simultaneously transmitted by the UE is greater than M, one or more UCIs smaller than K are transmitted through the PUCCH, wherein M is a natural number equal to or less than N and the number of serving cells. A base station for receiving uplink control information in a plurality of serving cells, characterized in that.
20. The method of claim 19,

    The receiving unit, the base station, characterized in that for receiving the UCI of the secondary cell (Secondary Cell) of the UCI as a piggyback on the PUSCH resource allocated to the terminal.

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