KR20140106365A - Methods of controlling uplink control information transmission and apparatuses thereof - Google Patents

Methods of controlling uplink control information transmission and apparatuses thereof Download PDF

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Publication number
KR20140106365A
KR20140106365A KR1020130113663A KR20130113663A KR20140106365A KR 20140106365 A KR20140106365 A KR 20140106365A KR 1020130113663 A KR1020130113663 A KR 1020130113663A KR 20130113663 A KR20130113663 A KR 20130113663A KR 20140106365 A KR20140106365 A KR 20140106365A
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South Korea
Prior art keywords
information
cell
secondary cell
uplink control
base station
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KR1020130113663A
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Korean (ko)
Inventor
박규진
최우진
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주식회사 케이티
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Priority to PCT/KR2014/000377 priority Critical patent/WO2014133263A1/en
Publication of KR20140106365A publication Critical patent/KR20140106365A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Abstract

The present invention relates to a method for controlling the transmission of uplink control information and an apparatus thereof. The method for controlling the transmission of the uplink control information by a base station according to one embodiment of the present invention includes the steps of: transmitting set information about a candidate secondary cell from the base station to a terminal through a primary cell by using high layer signaling and receiving reporting with a measurement result about the candidate secondary cell from the terminal; and transmitting instruction information to instruct activation or inactivation for the partial or entire candidate secondary cell by the base station. The terminal transmits the uplink control information in the secondary cell.

Description

[0001] The present invention relates to a method and apparatus for controlling uplink control information,

The present invention relates to a method and apparatus for controlling transmission of uplink control information of a terminal for supporting a carrier merging technique between base stations.

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. In a mobile communication system such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series, a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data outside a voice- It is required to develop a technique capable of transmitting large-capacity data in accordance with the above-described method. It is possible to efficiently transmit data using a plurality of cells in a method for transmitting a large amount of data.

Meanwhile, there is a need for a technique for controlling uplink control information transmission in uplink transmission in a plurality of cells or a small cell.

In order to solve the above-described problems, the present invention proposes a method and apparatus for controlling uplink control information through a primary cell to be transmitted through a secondary cell in a CA environment.

In order to solve the above-described problems, a method for controlling transmission of uplink control information by a base station according to an embodiment of the present invention is a method in which a base station sets up configuration information for a candidate secondary cell through a primary cell using upper layer signaling The method comprising the steps of: transmitting to a terminal a report including a measurement result for the candidate secondary cell from the terminal, and transmitting indication information indicating whether the base station activates or deactivates some or all of the candidate secondary cells Includes. And the UE transmits uplink control information in the secondary cell.

A method for controlling transmission of uplink control information according to an embodiment of the present invention is a method for a terminal to receive upper layer signaling including setting information for a candidate secondary cell from a base station through a primary cell, Receiving from the base station indication information indicating activation or deactivation of some or all of the candidate secondary cells from the base station, and transmitting, from the base station, uplink control information To the mobile station.

A base station according to an exemplary embodiment of the present invention transmits configuration information for a candidate secondary cell to a mobile station using upper layer signaling through a primary cell and instructs activation or deactivation of a part or all of the candidate secondary cells And a control unit for controlling the transmitting unit and the receiving unit, wherein the terminal is configured to perform uplink control on the secondary cell, And transmits the information.

A terminal according to an embodiment of the present invention receives an upper layer signaling including setting information for a candidate secondary cell from a base station through a primary cell and instructs activation or deactivation of a part or all of the candidate secondary cells And a control unit for controlling the transmission unit to transmit uplink control information in the secondary cell, wherein the control unit controls the transmission unit to transmit the uplink control information to the secondary cell, And controls transmission of uplink control information.

When the present invention is applied. In the CA environment, uplink control information can be transmitted not only through the primary cell but also through the secondary cell.

Figure 1 shows an example network configuration scenario for the present invention.
Fig. 2 shows another example of a network configuration scenario for the present invention.
FIG. 3 is a diagram illustrating a portion of a configuration of an upper layer RRC signaling message according to an exemplary embodiment of the present invention. Referring to FIG.
4 is a diagram illustrating a MAC CE according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a process of instructing UCI transmission through a secondary cell implicitly according to an embodiment of the present invention.
6 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.
FIG. 7 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment of the present invention. Referring to FIG.
8 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
9 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

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

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like. Hereinafter, the user terminal may be referred to as a terminal in the present specification. Hereinafter, the user terminal may be referred to as a terminal in the present specification.

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 (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), a transmission point (TP), a reception point It can be called another term.

In this specification, a base station or a cell should be interpreted in a generic sense to indicate a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) , Coverage of various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes 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- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-advanced, a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like. On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

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

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

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

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

In the following description, the description that the PDCCH is transmitted or received or the signal is transmitted or received through the PDCCH may be used to mean transmitting or receiving the EPDCCH or transmitting or receiving the signal through the EPDCCH.

The physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH. For convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH.

In addition, the High Layer Signaling described herein includes RRC signaling for transmitting RRC information including RRC parameters.

An eNB, which is an embodiment of a base station, performs downlink transmission to terminals. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Carrier aggregation (CA) prior to 3GPP LTE / LTE-Advanced Rel-11 may be used to merge one or more CCs (component carriers) constituted by a base station forming one cell for any terminal Or by merging the CCs of small cells built using the low power RRH (Remote Radio Head), which is a geographically dispersed antenna within the coverage of the macro cell and the macro cell, to increase the data transmission rate.

In particular, to apply CA technology, macrocells and RRH cells are configured to be scheduled under the control of one eNB. For this purpose, an ideal backhaul between macrocell nodes and RRH is required. An ideal backhaul is a backhaul that exhibits very high throughput and very little delay, such as a dedicated point-to-point connection using optical fiber, Line Of Sight (microware), and microware. In contrast, a backhaul exhibiting relatively low throughput and large delay, such as a digital subscriber line (xDSL) and a non-LOS microwave, is called a non-ideal backhaul.

In the LTE / LTE-Advanced system, the CC, which operates on independent center frequencies, is referred to as a cell, which is constructed by a network operator such as a base station / eNB / RRH Physical cells that are formed through a single transport node. In the present invention, the concept of the cell is distinguished by the context.

In a CA operation for an arbitrary terminal, a CC corresponding to a serving cell in which the corresponding terminal enters the initial network entry / re-entry (initial network entry / re-entry) Information related to secondary cells that can be additionally merged according to the capability of the UE through the corresponding primary cell is set by RRC signaling and then transmitted through a MAC CE The CA technology is applied to a structure in which the cell to be merged is activated or deactivated among the secondary cells set through the RRC signaling.

As described above, when a CA for an arbitrary terminal is applied in a system of 3GPP LTE / LTE-Advanced Rel-11 or below, a single scheduling unit-based CA is applied even to cells having independent center frequencies, The PUCCH resource for transmitting uplink control information (UCI) of the UE is configured only through the primary cell among the merged serving cells. Accordingly, when an arbitrary CA-applied UE transmits a UCI, the UE transmits the PUCCH resource through the PUCCH resource of the primary cell or the PUCCH / PUSCH simultaneously (PUCCH / PUSCH simultaneous) The PUSCH transmission resource of the primary cell or the PUSCH transmission resource of the secondary cell.

Figure 1 shows an example network configuration scenario for the present invention.

As shown in FIG. 1, each of the cells formed by two or more different base stations (which may be variously referred to as an eNB / RU / RRH / eNodeB) 110 and 120 is connected to an arbitrary terminal 130 The frequency bands supported by the respective base stations 110 and 120 may be merged to increase the data rate of the corresponding terminal 130 to merge the inter-base-station carriers used for data transmission / reception. 1, a cell type formed by each of the base stations 110 and 120 may be a macro cell, a small cell (e.g., a picocell, a microcell, etc.), a femtocell femto cell), and the like.

As a representative scenario requiring application of the inter-base-station carrier merging technique, the carrier between the small cells formed by overlapping with the macrocell can be merged as shown in FIG.

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

Small cells formed by low-power base stations using low transmission (Tx) power compared to general macro base stations cover cells smaller in size than macro cells, so that the spatial recyclability of frequency is increased compared to the macrocell-based network structure In addition, it is easy to handle a high data rate in a local area such as a hot spot where data traffic is introduced when it is overlapped with a macro cell. However, when such a small cell is introduced, the problem of inter-cell interference becomes more serious. In particular, in a heterogeneous network scenario in which macro cells and small cells using the same frequency band are overlapped, Inter-cell interference can cause severe performance degradation.

Therefore, a small cell enhancement scheme for minimizing interference between a macro cell and a small cell is required while increasing a data transmission rate of a specific local area through introduction of a low power base station. As an embodiment for improving a small cell, In the environment where the frequency bands of the macro cell and the small cell are different from each other, the terminals 230 belonging to the small cell coverage are respectively connected to the macro cell base station 210 through the frequency bands (carriers 1 and F1) cell carrier aggregation (inter-eNB Carrier Aggregation) that connects to the small cell base station 220 through the frequency bands (carriers 2 and F2) of the small cell in addition to the connection with the small cell base station 220 in the state where the small cell base station 220 is connected.

However, when an ideal backhaul is not established between the macro base station and the small cell base station as shown in FIG. 2, for example, when a non-ideal backhaul is constructed between the macro base station and the small cell, -eNB) CA technology may be difficult to apply. In particular, when CA is applied by merging F2, which is a small cell carrier, into a secondary cell while F1 is held as a primary cell by the UE, the UE transmits the UCI to the primary cell. As a result, Operation and wireless channel-based scheduling.

1, if the frequency bands supported by the corresponding base stations are used for a terminal located in an inter-cell overlapping region formed by two or more base stations, In a non-ideal backhaul environment in which there is a backhaul delay time between two adjacent cells, the above-described problem is equally applied.

In the present invention, a UCI transmission scheme for applying a carrier merging technique between base stations under a non-ideal backhaul based on a somewhat long backhaul delay time between the base stations as shown in FIG. 1 is proposed. In particular, as shown in FIG. 2, the present invention focuses on a UCI transmission scheme for a CA terminal that merges a small cell carrier F2 with a macro cell carrier as a primary cell in a carrier merging scenario between a macro cell and a small cell, However, it is clear that the proposed technique can be equally applied to a common carrier-to-base-station merging scenario as shown in FIG. Although it is assumed that each cell supports one carrier, the same scheme can be applied even if it is expanded to arbitrary N carriers without limiting it to one. Even in the case where one or N-1 additional secondary CCs are merged in addition to the primary cell having the current connection from the terminal point of view, The contents can be applied equally.

The operation according to the embodiment of the present invention will be described below.

The embodiment of the present invention consists of two processes. The process of identifying the small cell carrier and the new UCI transmission in the identified cell.

We will look at the identification of small cell carriers (UCI splitting indications). First, second, and third embodiments will be described.

(RRC signaling based indication) based on the RRC signaling in the first embodiment.

For a terminal supporting a CA and a base station, a base station to which the terminal belongs may receive, in addition to the primary cell, which is a CC connected to the corresponding terminal through higher layer RRC signaling, For example, candidate secondary cells, and the UE performs measurement of secondary cells according to the RRC setting information, and performs reporting on the secondary cells. The base station can perform activation / deactivation of the specific secondary cell (s) among the candidate secondary cells set through the RRC signaling through the MAC CE message to the corresponding base station.

In the embodiment of the present invention, when transmitting the RRC configuration information for the candidate secondary cells, in addition to the existing configuration information, a cell type indication or a UCI splitting indication information for each secondary cell is additionally provided Define additional and transmit together. This information is used for scheduling (for example, scheduling) through a separate scheduler installed in a separate base station / eNB / RRH that is not co-located with the secondary cell to which the corresponding secondary cell belongs, (For example, a case where a primary cell supported by a macro cell and a carrier of a small cell connected by a non-ideal back hole are set as a corresponding secondary cell). In the terminal view, all information transmitted through the PUCCH or PUSCH It can be interpreted as UCI separation indication information indicating that UCI information should be transmitted through the secondary cell independently, rather than transmitting through the primary cell as in the existing CA operation. According to the setting of the corresponding cell type indication information area, whether the corresponding terminal will perform the terminal operation according to the UCI information transmission method of the CA defined in the existing Rel-11 or lower system, or whether the primary cell and the existing Rel- It is possible to decide whether to follow the UCI transmission method based on the newly defined Rel-12 CA so that the UCI of each cell can be transmitted only through the corresponding cell, instead of the CA-based UCI transmission method defined in the system below 11. Although the new UCI transmission method based on Rel-12 is described below, even if a new Rel-12 CA-based UCI transmission method not described in the following description is defined, the corresponding UCI transmission method based on the Rel- All cases where an information area for indicating a UCI transmission scheme to be applied to a CA terminal among the Rel-12 CA-based UCI transmission schemes are defined are included in the scope of the present invention.

The first embodiment is summarized as follows. The base station transmits configuration information for the candidate secondary cell to the UE through the upper layer RRC signaling in the primary cell. The setting information may include cell type indication or UCI separation indication information. The UE performs measurement on the candidate secondary cells using the received configuration information, and then reports to the base station. The base station transmits the MAC CE message to the terminal using the reported information, and includes information for activating or deactivating the specific secondary cell (s) of the candidate secondary cells. The UE transmits the UCI for the activated secondary cell through the secondary cell using the cell type indication or the UCI separation indication information of the actual information through the RRC signaling.

FIG. 3 is a diagram illustrating a portion of a configuration of an upper layer RRC signaling message according to an exemplary embodiment of the present invention. Referring to FIG.

In FIG. 3, reference numeral 310 or 320 is an element related to the setting of the secondary cell in the RRC connection reconfiguration message. The cell type information of the cell to be a candidate in 310 may be included as 315 and the UCI separation indication information of the candidate cell may be included as 325 in 320. In 315, sCellTypeIndication can indicate various types of secondary cells. Among these, cells corresponding to predefined values are transmitted from the secondary cell. In step 325, it is instructed that the UCI is separated from the primary cell and transmitted directly in the corresponding secondary cell. If a value of 'true' is set as the value of sCellUCI_SplitTransmission, the UE transmits the UCI separated from the primary cell in the corresponding secondary cell.

(MAC CE based indication) based on the MAC CE in the second embodiment.

The corresponding instruction information may be transmitted through the MAC CE signaling for activating the CA for the corresponding secondary cell by another method of the cell type indication or the UCI separation indication. The UE may include the cell type indication or the UCI separation indication information for the corresponding cell when the MAC CE signaling for activating a specific secondary cell among the candidate secondary cells is transmitted to an arbitrary terminal supporting the CA. Accordingly, the UE can determine the UCI transmission scheme for the corresponding secondary cell according to the corresponding cell type indication information included in the MAC CE signaling activated by the corresponding secondary cell. In this case, it is determined whether to follow the newly defined Rel-12 CA-based UCI transmission method in which the UCI for the primary cell merged for the UE and the UCI for the secondary cell are independently transmitted for each cell, Rel-11 CA-based UCI transmission method.

The second embodiment is summarized as follows. The base station transmits configuration information for the candidate secondary cell to the UE through the upper layer RRC signaling in the primary cell. The UE performs measurement on the candidate secondary cells using the received configuration information, and then reports to the base station. The base station transmits the MAC CE message to the terminal using the reported information, and includes information for activating or deactivating the specific secondary cell (s) of the candidate secondary cells. In addition, the MAC CE message includes cell type indication or UCI separation indication information, and the UE uses cell type indication or UCI separation indication information included in the MAC CE message for instructing activation / deactivation of the secondary cell And transmits the UCI for the activated secondary cell through 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 Header and Subheader

Figure pat00001

The octet structure of the MAC header and the subheader is as shown in Table 1. The LCID value of the active / inactive MAC CE is 11011. An embodiment of the MAC subheader indicating this is indicated by reference numeral 410 in FIG. 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 cell type indication or UCI separation indication information, the last reserved bit is set to 1 as "00001001" 421 is set to '1' to activate the cell of SCellIndex 3, and the bit indicated by reference numeral 429 is also set to '1' to transmit the UCI in the secondary cell of SCellIndex 3 through the corresponding secondary cell And the like. As described above, the embodiment of the present invention can be applied to one or more secondary cells, for example, a plurality of secondary cells. In the case of the "00010101" And 4 are activated. Since the last reserved bit is "1 ", the UCI transmission in the secondary cell for the activated cell can be instructed to be performed through the corresponding secondary cell. In the above example, it is also possible to indicate by cell using a bit other than the last reserved bit or an area of a separate MAC payload.

It can be implicitly indicated as the third embodiment (Implicit indication).

It is implicit (implicit) as another way to instruct the terminal to send the UCI between the primary cell and the secondary cell separately. For an arbitrary UE merged with the secondary cell through the RRC setting for the secondary cell and the activation by the MAC CE in the same manner as in the conventional CA operation, for a PUCCH resource which is an uplink control channel through the downlink subframe of the corresponding secondary cell By transmitting the setting information, the UCI separation is implicitly set to the terminal. When a certain Rel-12 or higher terminal merged with the secondary cell receives the PUCCH resource allocation information of the uplink sub-frame of the corresponding secondary cell through the RRC signaling transmitted through the downlink sub-frame of the corresponding secondary cell, The UCI for the primary cell is transmitted through the PUCCH or PUSCH resource of the primary cell according to the new Rel-12 CA-based UCI transmission scheme by separating the UCI for the corresponding secondary cell and the UCI for the primary cell, UCI is transmitted only through the PUCCH or PUSCH resource of the secondary cell.

The third embodiment is summarized as follows. The base station transmits configuration information for the candidate secondary cell to the UE through the upper layer RRC signaling in the primary cell. The UE performs measurement on the candidate secondary cells using the received configuration information, and then reports to the base station. The BS transmits the MAC CE message to the UE using the reported information. Unlike the first and second embodiments, in a case where the upper layer RRC signaling or the MAC CE message does not include cell type indication or UCI separation indication information, the base station transmits RRC signaling transmitted through the downlink subframe of the secondary cell If the PUCCH resource of the uplink sub-frame of the corresponding secondary cell is allocated through the PUCCH resource or the PUSCH allocated to the secondary cell, the UE transmits the UCI of the secondary cell.

FIG. 5 is a diagram illustrating a process of instructing UCI transmission through a secondary cell implicitly according to an embodiment of the present invention.

The base station 501 transmits the upper layer RRC signaling to the mobile station in the primary cell (S510). The UE performs measurement using the configuration information of the candidate secondary cell included in the received RRC signaling (S515), and transmits the measurement report to the base station (S520). The base station 501 transmits the upper layer RRC signaling for allocating the PUCCH resources of the uplink sub-frame of the secondary cell (S530). The MS transmits the UCI of the secondary cell from the PUCCH resource or the PUSCH allocated in the secondary cell (S540).

A new UCI transmission method in the identified cell will be described (Rel-12 CA based new UCI transmission method).

As described above, different types of CA-based UCI transmission methods according to the cell type indication or UCI separable indication setting information in the first, second, and third embodiments are applied when a CA for Rel-12 or higher terminals is applied Can be applied. The UCI transmission method defined in the existing Rel-11 CA can be applied to the UCI transmission method in the primary cell and the secondary cell, or the UCI can be independently transmitted in the primary cell and the secondary cell, respectively. In order to support a new cell-by-cell independent UCI transmission in the Rel-12 CA, a specific secondary cell is activated for a CA of an arbitrary terminal, and cell type indication information or UCI separation indication information of the corresponding first, second, If it is set to separate the UCI transmission between the primary cell and the secondary cell, the corresponding UE transmits the UCI independently in the primary cell and the secondary cell. CSI / CQI / RI / PMI information for a primary cell, channel state feedback information such as CSI / CQI / RI / PMI information for a secondary cell, SR (Scheduling Request) and HARQ feedback information are transmitted only through a secondary cell And HARQ feedback information are transmitted only through the primary cell. To this end, upon activation of the secondary cell of the corresponding terminal, PUCCH resource setting information (PUCCH resource allocation information for channel state feedback or SR, PUCCH offset information for HARQ ACK / NACK feedback, concurrent PUSCH / PUCCH Tx setting information, etc.) May activate the corresponding secondary cell through the MAC CE transmitted through the primary cell, and then transmit the secondary cell in the form of RRC signaling through the downlink sub-frame of the corresponding secondary cell. Alternatively, upon MAC CE signaling for activating the corresponding secondary cell through the primary cell, the MAC CE signaling may be transmitted including the PUCCH resource setting information. When independent UCI transmission is set for each cell, the UE transmits the UCI related to the primary cell through the uplink subframe of the primary cell according to the PUCCH resource setting information set for each cell, The associated UCI is transmitted through the uplink sub-frame of the secondary cell.

In the embodiment of the present invention, a small cell operation scheme based on a non-ideal backhaul in which a slightly longer backhaul delay time exists between the macro cell and the small cell is used. In particular, in a state where the macro cell carrier is held as a primary cell, We propose a UCI transmission scheme for CA terminals. In this paper, we propose UCI transmission method based on Rel-11 CA based on existing relocation method and UCI transmission method independently for each merged cell. Thus, it is possible to flexibly transmit CA-based UCI transmission method according to network deployment type .

6 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.

The base station transmits configuration information for the candidate secondary cell to the terminal through the primary cell using higher layer signaling (S610). Then, the terminal receives the report including the measurement result for the candidate secondary cell (S620). Then, the base station transmits indication information indicating activation or deactivation of some or all of the candidate secondary cells (S630). Then, the terminal transmits uplink control information in the secondary cell as instructed in step S610 or S630 or implicitly. The uplink control information may include at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell.

The upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information indicates the cell-by-cell type or instructs separate transmission of the uplink control information, as in the first embodiment in which separate transmission of UCI is instructed in step S610 Information. In step S630, the indication information is a MAC CE message as indicated by the second embodiment in which separate transmission of the UCI is instructed. The indication information includes information indicating the cell-by-cell type or indicating the separate transmission of the uplink control information . In addition, as in the third embodiment, it is possible to implicitly transmit separate transmission of the UCI, and the base station may transmit information for assigning a control channel to an uplink subframe of the secondary cell to a downlink subframe of the secondary cell Or by transmitting them over the Internet.

FIG. 7 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment of the present invention. Referring to FIG.

The terminal receives the upper layer signaling including the setting information for the candidate secondary cell from the base station through the primary cell (S710). In step S720, the UE transmits a report including the measurement result of the candidate secondary cell to the BS. The terminal receives indication information indicating activation or deactivation of some or all of the candidate secondary cells from the base station (S730). Then, the terminal transmits uplink control information in the secondary cell as indicated or implicitly indicated in S710 and S730. The uplink control information may include at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell.

The upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information indicates the cell-by-cell type or indicates the separate transmission of the uplink control information, as in the first embodiment in which the UCI separation transmission is instructed in step S710 Information. The indication information is a MAC CE message, and the indication information includes information indicating the cell-by-cell type or indicating the separate transmission of the uplink control information as in the second embodiment in which the separate transmission of UCI is instructed in step S730 . Also, the UE can implicitly instruct the separate transmission of UCI as in the third embodiment. In this case, information indicating that a UE assigns a control channel to a UL subframe of the secondary cell from the BS is referred to as a DL subframe of the secondary cell Or through the Internet.

The operation method of the base station and the terminal discussed above focuses on a new UCI transmission process in the cell identified in the first, second, and third embodiments, and is a non-ideal method in which a somewhat long backhaul delay time exists between the macro cell and the small cell. A method for transmitting uplink control information for a CA terminal that merges a small cell carrier with a macro cell carrier as a primary cell in an operation in a small cell based on a backhaul. The method includes a CA-based UCI transmission method, We have shown the process of setting up UCI to transmit independently.

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

8, a base station 800 according to another embodiment includes a control unit 810, a transmission unit 820, and a reception unit 830.

The control unit 810 is a small cell operation based on a non-ideal backhaul where there is a somewhat longer backhaul delay time between the macrocell and the small cell, which is necessary for carrying out the present invention described above. The UCI transmission method based on the CA and the operation of the overall base station to transmit the UCI independently for each merged cell are controlled when the uplink control information for the CA terminal merging the small cell carrier F2 is transmitted. The control unit 810 controls the transmission unit 820 and the reception unit 830.

The transmitting unit 820 and the receiving unit 830 are used to transmit and receive signals, messages, and data necessary for performing the above-described present invention.

In more detail, the transmitter 820 transmits configuration information for the candidate secondary cell to the terminal through higher-layer signaling through the primary cell, and instructs activation or deactivation of some or all of the candidate secondary cells And the receiving unit 830 receives the report including the measurement result of the candidate secondary cell from the terminal. The UE transmits uplink control information in the secondary cell. The uplink control information may include at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. The upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information is transmitted to the cell by the cell. In the UCI separation transmission, the UE transmits uplink control information in the secondary cell. Type or information for instructing separate transmission of the uplink control information. Like in the second embodiment, the indication information is a MAC CE message, and the indication information may indicate the cell-by-cell type or information for indicating separate transmission of the uplink control information. In addition, as in the third embodiment, it is possible to implicitly instruct the separate transmission of the UCI, which allows the terminal to inform the terminal of the assignment of the control channel in the uplink subframe of the secondary cell to the downlink subframe of the secondary cell Or by transmitting them over the Internet.

9 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

9, a user terminal 900 according to another embodiment includes a receiving unit 930, a control unit 910, and a transmitting unit 920.

The receiving unit 930 receives downlink control information, data, and a message from the base station through the corresponding channel.

In addition, the controller 910 is a small cell operation based on a non-ideal backhaul with a somewhat longer backhaul delay time between the macrocell and the small cell, which is necessary for carrying out the present invention described above. In addition, when transmitting the uplink control information for the CA terminal that merges the small cell carrier F2, the CA-based UCI transmission scheme and the overall operation of the UE are controlled by setting the UCI to be transmitted independently for each merged cell. The control unit 910 controls the transmission unit 920 and the reception unit 930.

The transmitter 920 transmits uplink control information, data, and a message to the base station through the corresponding channel.

In more detail, the receiving unit 930 receives upper layer signaling including setting information for a candidate secondary cell from a base station through a primary cell, and receives an instruction to activate or deactivate a part or all of the candidate secondary cells And receives information from the base station. The transmitting unit 920 transmits the report including the measurement result of the candidate secondary cell to the base station. Also, the controller 910 controls the transmitter 920 to transmit uplink control information in the secondary cell. The uplink control information may include at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. The upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information is transmitted to the cell by the cell. In the UCI separation transmission, the UE transmits uplink control information in the secondary cell. Type or information for instructing separate transmission of the uplink control information. Like in the second embodiment, the indication information is a MAC CE message, and the indication information may indicate the cell-by-cell type or information for indicating separate transmission of the uplink control information. Also, as in the case of the third embodiment, the UCI can be implicitly instructed to separate transmission of the UCI, and information indicating that the receiver allocates the control channel to the uplink subframe of the secondary cell from the base station is referred to as a downlink subframe of the secondary cell Or through the Internet.

In a heterogeneous network environment in which a macro cell and a small cell are overlapped to date, there is a need to improve the data transmission rate and offloading the macro cell and the small cell eNB in a dual- ), And the components of the base station and the terminal have been described.

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

Claims (20)

A method for controlling transmission of uplink control information by a base station,
The base station transmits configuration information for the candidate secondary cell to the terminal through higher layer signaling through the primary cell and receives reporting including the measurement result for the candidate secondary cell from the terminal; And
The base station transmitting indication information indicating activation or deactivation of some or all of the candidate secondary cells.
And the UE transmits uplink control information in the secondary cell. The method according to claim 1,
Wherein the uplink control information includes at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. The method according to claim 1,
Wherein the upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information includes information indicating the cell-by-cell type or indicating separate transmission of the uplink control information. The method according to claim 1,
Wherein the indication information is a MAC CE message, and the indication information includes information indicating cell type or indication of separate transmission of the uplink control information. The method according to claim 1,
Wherein the base station further comprises the step of transmitting information for assigning a control channel to an uplink subframe of the secondary cell through the downlink subframe of the secondary cell. A method for a terminal to control transmission of uplink control information,
Receiving, from a base station, an upper layer signaling including setting information for a candidate secondary cell through a primary cell, and transmitting a report including a measurement result for the candidate secondary cell to the base station;
Receiving instruction information from the base station indicating activation or deactivation of some or all of the candidate secondary cells; And
And transmitting uplink control information in the secondary cell. The method according to claim 6,
Wherein the uplink control information includes at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. The method according to claim 6,
Wherein the upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information includes information indicating the cell-by-cell type or indicating separate transmission of the uplink control information. The method according to claim 6,
Wherein the indication information is a MAC CE message, and the indication information includes information indicating cell type or indication of separate transmission of the uplink control information. The method according to claim 6,
Before the step of transmitting the uplink control information
Wherein the terminal further comprises receiving information for assigning a control channel to a UL subframe of the secondary cell from the BS through a downlink subframe of the secondary cell. A transmitting unit for transmitting setting information for a candidate secondary cell to a terminal using upper layer signaling through a primary cell and transmitting indication information indicating activation or deactivation of a part or all of the candidate secondary cells;
A receiving unit for receiving a report including a measurement result of the candidate secondary cell from the terminal; And
And a control unit for controlling the transmitting unit and the receiving unit,
And the UE transmits uplink control information in the secondary cell. 12. The method of claim 11,
Wherein the uplink control information includes at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. 12. The method of claim 11,
Wherein the upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information includes information indicating the cell-by-cell type or indicating separate transmission of the uplink control information. 12. The method of claim 11,
Wherein the indication information is a MAC CE message, and the indication information includes information indicating cell type or indication of separate transmission of the uplink control information. 12. The method of claim 11,
Wherein the transmitter transmits information for allocating a control channel to a UL in a secondary sub-frame of the secondary cell through a downlink sub-frame of the secondary cell. A receiving unit for receiving, from a base station, upper layer signaling including setting information for a candidate secondary cell through a primary cell, and for receiving indication information indicating activation or deactivation of some or all of the candidate secondary cells from a base station;
A transmitter for transmitting a report including a measurement result to the candidate secondary cell to the base station; And
And a control unit for controlling the transmitting unit to transmit uplink control information in the secondary cell. 17. The method of claim 16,
Wherein the uplink control information includes at least one of channel state feedback information, scheduling request (SR) information, and HARQ feedback information for the secondary cell. 17. The method of claim 16,
Wherein the upper layer signaling is an RRC (Radio Resource Control) signaling, and the setting information includes information indicating the cell-by-cell type or indicating separate transmission of the uplink control information. 17. The method of claim 16,
Wherein the indication information is a MAC CE message, and the indication information includes information indicating the cell-by-cell type or indicating the separate transmission of the uplink control information. 17. The method of claim 16,
Before the transmitter transmits the uplink control information
Wherein the receiving unit receives information for assigning a control channel to a UL subframe of the secondary cell from the BS through a downlink subframe of the secondary cell.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160046234A (en) * 2014-10-20 2016-04-28 한국전자통신연구원 Apparatus for controlling of carrier of telecommunication networks
CN111492686A (en) * 2017-11-01 2020-08-04 株式会社Ntt都科摩 User terminal and wireless communication method
CN112997520A (en) * 2018-11-15 2021-06-18 株式会社Ntt都科摩 User device and base station device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160046234A (en) * 2014-10-20 2016-04-28 한국전자통신연구원 Apparatus for controlling of carrier of telecommunication networks
CN111492686A (en) * 2017-11-01 2020-08-04 株式会社Ntt都科摩 User terminal and wireless communication method
CN111492686B (en) * 2017-11-01 2024-04-16 株式会社Ntt都科摩 User terminal and wireless communication method
CN112997520A (en) * 2018-11-15 2021-06-18 株式会社Ntt都科摩 User device and base station device
CN112997520B (en) * 2018-11-15 2024-02-13 株式会社Ntt都科摩 User device and base station device

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