KR20150045684A - Apparatus and method for performing communication in wireless communication system in which different duplex scheme is applied to different serving cell - Google Patents

Abstract

The present invention relates to apparatus and method for performing communication in wireless communication system in which different duplex methods are applied to different serving cells. The present invention provides a method by which user equipment performs communication, comprising the steps of: configuring, in the user equipment, a primary serving cell (PCell) and a secondary serving cell (SCell), to which the different duplex schemes are applied, by carrier aggregation; and performing downlink reception and/or uplink transmission on the PCell and the SCell through two collision subframes having transmission links having different directions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for performing communication in a wireless communication system having a different duplex scheme for each serving cell,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to wireless communication, and more particularly, to an apparatus and method for performing communication in a wireless communication system having a different duplex scheme for each serving cell.

Radio resources used for wireless communication are generally defined in the frequency domain, time domain and code domain. In wireless communication, a user equipment (UE) and a base station (BS) must use a given radio resource. A wireless path that a terminal transmits to a base station is called an uplink, and a wireless path that a base station transmits to a terminal is called a downlink. On the other hand, a method of distinguishing between radio resources used for downlink transmission and radio resources used for uplink transmission is required, which is called a duplex.

As in the multiple access scheme for differentiating different users, the separation of the uplink and downlink is possible in the frequency and time domain. The duplex scheme is a half-duplex scheme in which data transmission and reception can not be performed simultaneously within one time unit, and a full-duplex scheme in which data can be transmitted and received at the same time have. In the half-duplex system, transmission is impossible when the terminal (or the base station) is receiving data, and reception is impossible when the terminal (or the base station) is transmitting data. That is, it provides only uni-directional communication within one time unit.

In the full-duplex scheme, there is an FDD (Frequency Division Duplex) scheme for dividing the uplink and the downlink into frequencies. The half-duplex scheme includes a TDD (Time Division Duplex) half-duplex scheme And an FDD half-duplex scheme that divides the uplink and downlink into both frequency and time.

In the FDD scheme, since the uplink and the downlink are divided in the frequency domain, data transmission / reception between the base station and the UE can be continuously performed in the time domain in each link. The FDD scheme allocates frequencies symmetrically on the uplink and the downlink, and is often used for symmetric services such as voice calls. Recently, however, asymmetric services such as Internet services have included TDD This study has been actively researched.

The TDD scheme has an advantage in that it is suitable for asymmetric services since it can assign time slots of different ratios to the uplink and downlink. Another advantage of the TDD scheme is that the uplink and downlink are transmitted and received in the same frequency band, so that the channel states of the uplink and the downlink are almost the same. Therefore, it is possible to estimate the channel state immediately after receiving a signal, which is suitable for array antenna technology. In the TDD scheme, the entire frequency band is used as an uplink or a downlink. Since the uplink and downlink are separated in a time domain, the TDD scheme uses uplink for a predetermined time and downlink for another fixed time Data can not be simultaneously transmitted and received between the base station and the terminal.

On the other hand, frequency resources are saturated based on the present and various technologies are used in a part of a wide frequency band. For this reason, in order to satisfy a higher data rate requirement, each of the scattered bands is designed to satisfy the basic requirements for operating the independent system, and a plurality of bands are allocated to one system (Carrier Aggregation, CA). In this case, each independently operable band or carrier is defined as a component carrier (CC). With the advent of the carrier aggregation system, ACK / NACK signals corresponding to a plurality of elementary carriers (CCs) must be transmitted.

Recently, TDD-FDD carrier aggregation for aggregating carrier waves in the FDD band (hereinafter referred to as FDD carrier) and carriers in the TDD band (hereinafter referred to as TDD carrier) are considered. TDD-FDD Carrier aggregation may be referred to as a TDD-FDD combining technique. Depending on the capabilities of the terminal, TDD-FDD carrier aggregation may or may not be supported. However, in implementing TDD-FDD carrier aggregation, the same subframe in different bands and carrier phases (e.g., TDD and FDD carrier) may be divided into different subframe types (eg, a normal or special subframe) If configured, the terminal has not yet determined what action to perform.

The present invention also provides an apparatus and method for performing communication in a wireless communication system having a different duplex scheme for each serving cell.

Another aspect of the present invention is to provide a method of operating in a conflicting subframe according to a duplex scheme applied to a serving cell according to the capability of a terminal supporting TDD-FDD carrier aggregation.

Another aspect of the present invention is to provide a terminal and a base station supporting TDD-FDD carrier aggregation.

According to an aspect of the present invention, there is provided a method of performing communication by a terminal. The method includes constructing a primary serving cell (PCell) and a secondary serving cell (SCell) to which a different duplex scheme is applied in a terminal by carrier aggregation, And performing at least one of downlink reception and uplink transmission on the main serving cell and the secondary serving cell through two collision subframes having different transmission links, do.

Here, the capability of the UE is determined based on a full-duplex capability, a half-duplex scheme based on a sub-frame of the main serving cell, Half duplex, and the downlink reception and the uplink transmission can be performed selectively or simultaneously according to the different duplex scheme.

According to another aspect of the present invention, there is provided a terminal performing communication. The terminal includes a terminal processor configured to configure a primary serving cell (PC) and a secondary serving cell (SCell) to which a different duplex scheme is applied by performing carrier aggregation on a terminal, A receiver for performing downlink reception on two main collision subframes having different transmission links on the main serving cell and the secondary serving cell, And a transmission unit for performing link transmission.

The terminal processor determines whether the capability of the UE is full-duplex, half-duplex based on the sub-frame of the main serving cell, and presence / absence of the uplink transmission The receiver can control the receiver and the transmitter so that the downlink reception and the uplink transmission can be selectively or simultaneously performed according to the different duplex scheme and the half-duplex scheme.

According to the present invention, in a situation of carrier aggregation between carriers using different duplex schemes, in order to support TDD-FDD carrier aggregation according to different sub-frame types and terminal capabilities on different carriers during one sub-frame A new operation can be defined.

1 shows a wireless communication system to which the present invention is applied.
2 shows an example of a protocol structure for supporting a multicarrier system to which the present invention is applied.
3 is an example of a radio frame structure to which the present invention is applied.
FIG. 4 is a diagram illustrating an exemplary comparison between FDD, TDD, and FDD half-duplex schemes to which the present invention is applied.
FIG. 5 is an explanatory diagram showing the difference in TDD uplink / downlink configuration between serving cells in an interband carrier aggregation according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 6 shows an example in which a TDD-FDD joint operation technique to which the present invention is applied is applied.
FIG. 7 shows examples of terminal capabilities for a TDD-FDD combining operation to which the present invention is applied.
FIG. 8 shows an example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.
9 shows an operation method of the full-duplex terminal when the main serving cell is a special subframe.
10 is a view for explaining a method of spanning a special subframe into a DL subframe or an UL subframe in TDD-FDD carrier aggregation according to an example of the present invention.
FIG. 11 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to the present embodiment.
FIG. 12 is a view for explaining a method of converting a special subframe into a new format subframe in the TDD-FDD carrier aggregation according to another example of the present invention.
FIG. 13 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to the present embodiment.
FIG. 14 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.
FIG. 15 shows an operation method of the terminal when the main serving cell is a special sub-frame.
16 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.
FIG. 17 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.
18 is a signaling flowchart between a terminal and a base station according to an example of the present invention.
19 is a signaling flowchart between a terminal and a base station according to another example of the present invention.
20 is a block diagram illustrating a terminal and a base station according to an exemplary embodiment of the present invention.

Hereinafter, some embodiments 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 numerals even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

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

According to one embodiment of the present invention, transmission of a control channel can be interpreted as meaning that control information is transmitted through a specific channel. Here, the control channel may be, for example, a Physical Downlink Control Channel (PDCCH) or a Physical Uplink Control Channel (PUCCH).

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). The cell may again be divided into multiple regions (referred to as sectors).

A mobile station (MS) 12 may be fixed or mobile and may be a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like. The base station 11 may be called by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, a femto base station, a home node B, . Cells are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

Hereinafter, downlink refers to communication from the base station 11 to the terminal 12, and uplink refers to communication from the terminal 12 to the base station 11. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11. There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. 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.

A carrier aggregation (CA) supports a plurality of carriers and is also referred to as spectrum aggregation or bandwidth aggregation. The individual unit carriers tied by carrier aggregation are called component carriers (CCs). Each element carrier is defined as the bandwidth and center frequency. Carrier aggregation is introduced to support increased throughput, prevent cost increases due to the introduction of wideband radio frequency (RF) devices, and ensure compatibility with existing systems. For example, if five elementary carriers are allocated as the granularity of a carrier unit having a bandwidth of 20 MHz, it can support a bandwidth of up to 100 MHz.

Carrier aggregation can be divided into contiguous carrier aggregation between successive element carriers in the frequency domain and non-contiguous carrier aggregation between discontinuous element carriers. The number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink element carriers is equal to the number of uplink element carriers is referred to as symmetric aggregation and the case where the number of downlink element carriers is different is referred to as asymmetric aggregation.

The size (i.e. bandwidth) of the element carriers may be different. For example, if five element carriers are used for a 70 MHz band configuration, then 5 MHz element carrier (carrier # 0) + 20 MHz element carrier (carrier # 1) + 20 MHz element carrier (carrier # 2) + 20 MHz element carrier (carrier # 3) + 5 MHz element carrier (carrier # 4).

Hereinafter, a multiple carrier system includes a system supporting a carrier aggregation (CA). In a multi-carrier system, adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used, and either symmetric aggregation or asymmetric aggregation may be used. A serving cell can be defined as an element frequency band that can be aggregated by carrier aggregation based on a multiple component carrier system. The serving cell includes a primary serving cell (PCell) and a secondary serving cell (SCell). The main serving cell is a single serving cell that provides security input and non-access stratum (NAS) mobility information in a Radio Resource Control (RRC) establishment or re-establishment state. Quot; serving cell ". Depending on the capabilities of the terminal, at least one cell may be configured to form a set of serving cells together with a main serving cell, said at least one cell being referred to as a secondary serving cell. The set of serving cells set for one UE may consist of only one main serving cell or may consist of one main serving cell and at least one secondary serving cell.

The downlink component carrier corresponding to the main serving cell is referred to as a downlink principal carrier (DL PCC), and the uplink component carrier corresponding to the main serving cell is referred to as an uplink principal carrier (UL PCC). In the downlink, the element carrier corresponding to the secondary serving cell is referred to as a downlink sub-element carrier (DL SCC), and in the uplink, an elementary carrier corresponding to the secondary serving cell is referred to as an uplink sub-element carrier (UL SCC) do. Only one DL serving carrier may correspond to one serving cell, and DL CC and UL CC may correspond to each other.

2 shows an example of a protocol structure for supporting a multicarrier system to which the present invention is applied.

Referring to FIG. 2, a common Medium Access Control (MAC) entity 210 manages a physical layer 220 using a plurality of carriers. The MAC management message transmitted on a specific carrier may be applied to other carriers. That is, the MAC management message is a message capable of controlling other carriers including the specific carrier. The physical layer 220 may operate as a time division duplex (TDD) and / or a frequency division duplex (FDD).

There are several physical control channels used in the physical layer 220. The physical downlink control channel (PDCCH) informs the UE of resource allocation of a paging channel (PCH), a downlink shared channel (DL-SCH), and hybrid automatic repeat request (HARQ) information related to the DL-SCH. The PDCCH may carry an uplink grant informing the UE of the resource allocation of the uplink transmission. A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. PHICH (Physical Hybrid ARQ Indicator Channel) carries an HARQ ACK / NACK signal in response to an uplink transmission. That is, the ACK / NACK signal for the uplink data transmitted by the UE is transmitted on the PHICH. A physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request and CQI for downlink transmission. A physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH). The uplink data transmitted on the PUSCH may be a trnasport block that is a data block for UL-SCH. A physical random access channel (PRACH) carries a random access preamble.

A plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs. The PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs). The CCE is a logical allocation unit used to provide the PDCCH with the coding rate according to the state of the radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of bits of the possible PDCCH are determined according to the relationship between the number of CCEs and the coding rate provided by the CCEs.

The control information transmitted through the PDCCH is referred to as downlink control information (DCI). Table 1 below shows the DCI according to various formats.

DCI format Explanation 0 Used in scheduling of PUSCH (uplink common channel) in uplink cell One Used for scheduling one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and in a random access procedure initiated by a PDCCH command. 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH changes 1D Used for simple scheduling of one PDSCH codeword in one cell, including precoding and power offset information. 2 Used for PDSCH scheduling for terminals configured in spatial multiplexing mode. 2A Used for PDSCH scheduling of UEs configured in CDD mode with large delay. 2B Used in transmission mode 8 (dual layer transmission, etc.) 2C Used in transmission mode 9 (multi layer transmission) 2D Used in transfer mode 10 (CoMP) 3 Used for transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustment 3A Used for transmission of TPC commands for PUCCH and PUSCH with single bit power adjustment. 4 Used for scheduling of PUSCH in multi-antenna port transmission mode cell for uplink

Referring to Table 1, the DCI format includes a format 0 for PUSCH scheduling in a UL cell, a format 1 for scheduling one PDSCH codeword, a format 1A for compact scheduling of one PDSCH codeword, a DL- SCH for very simple scheduling, Format 2 for PDSCH scheduling in a closed-loop spatial multiplexing mode, Format 2A for PDSCH scheduling in an open-loop spatial multiplexing mode, A format 2B used in a transmission mode (TM) 8, a format 2C used in a transmission mode 9, a format 2D used in a transmission mode 10, a format for transmission of a transmission power control (TPC) command for an uplink channel 3 and 3A, and a format 4 for PUSCH scheduling in a multi-antenna port transmission mode for an uplink.

Each field of the DCI is sequentially mapped to _n information bits a ₀ through a _{n -1} . For example, if the DCI is mapped to a total of 44 bits of information bits, each DCI field is sequentially mapped to a ₀ to a ₄₃ . DCI formats 0, 1A, 3, and 3A may all have the same payload size. The DCI formats 0 and 4 may be referred to as UL grants (uplink grants).

On the other hand, cross-carrier scheduling is performed by using a resource allocation of a PDSCH transmitted through another elementary carrier over a PDCCH transmitted through a specific element carrier and / or a resource allocation of a PDSCH other than an elementary carrier, And a resource allocation of a PUSCH to be transmitted through a carrier wave of another element is possible. That is, the PDCCH and the PDSCH can be transmitted through different DL CCs, and the PUSCH can be transmitted through a UL CC other than the UL CC linked with the DL CCs to which the PDCCH including the UL grant is transmitted.

In the case of performing cross-carrier scheduling, the UE can receive scheduling information (UL grant, etc.) only through a specific serving cell (or CC). Hereinafter, the serving cell (or CC) for performing cross carrier scheduling may be referred to as a scheduling cell (or CC), and another serving cell (or CC) to be scheduled by the scheduling cell (or CC) may be referred to as a scheduled cell (or CC). A scheduling cell may be referred to as an ordering cell, and a scheduled cell may be referred to as a following serving cell.

Thus, in a system supporting cross-carrier scheduling, a carrier indicator is required to indicate to which DL CC / UL CC the PDSCH / PUSCH for providing control information is transmitted through the PDCCH. A field including such a carrier indicator is hereinafter referred to as a carrier indication field (CIF). Hereinafter, the setting of the CIF may mean that cross-carrier scheduling is set.

The above-mentioned cross-carrier scheduling can be divided into downlink cross-carrier scheduling and uplink cross-carrier scheduling. The downlink cross-carrier scheduling refers to a case where an element carrier on which a PDCCH including resource allocation information and other information for PDSCH transmission is different from an element carrier on which a PDSCH is transmitted. Uplink crossover carrier scheduling refers to a case where an element carrier on which a PDCCH including an UL grant for PUSCH transmission is transmitted is different from a DL element carrier linked with a UL element carrier on which a PUSCH is transmitted.

3 is an example of a radio frame structure to which the present invention is applied. This is an FDD radio frame structure and a TDD radio frame structure.

Referring to FIG. 3, one radio frame includes ten subframes, and one subframe includes two consecutive slots.

In case of FDD, there are a carrier used for uplink transmission and a carrier used for downlink transmission, and uplink transmission and downlink transmission can be simultaneously performed in one cell.

In the case of TDD, uplink and downlink transmission are always separated in time based on one cell. Since the same carrier is used for uplink transmission and downlink transmission, the base station and the terminal repeatedly switch between the transmission mode and the reception mode. In the case of TDD, a special subframe may be provided to provide a guard time for mode switching between transmission and reception. The special subframe may be composed of a downlink part (DwPTS), a guard period (GP), and an uplink part (UpPTS), as shown in the figure. Accordingly, the DL subframe or the UL subframe may include a special subframe in some cases. The protection period is necessary to avoid interference between the downlink and the uplink, and no downlink transmission or uplink transmission is performed during the protection period.

Table 1 shows an example of a UL-DL configuration of a radio frame in TDD. The uplink-downlink configuration defines reserved subframes for uplink transmission and subframes reserved for downlink transmission. That is, the uplink-downlink configuration indicates how all the subframes within one radio frame are allocated (or reserved) by the uplink and downlink.

Uplink / downlink configuration Switch point-in-time Sub-frame number 0 One 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U One 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6 5 ms D S U U U D S U U D

In Table 2, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. As shown in Table 2, subframes 0 and 5 are always allocated for downlink transmission, and subframe 2 is always allocated for uplink transmission. As shown in Table 2, the positions and the numbers of the downlink subframe and the uplink subframe in one radio frame are different for each uplink-downlink configuration. The amount of resources allocated to the uplink and the downlink transmission can be reduced asymmetrically through various uplink-downlink configurations. To avoid severe interference between downlink and uplink between cells, neighboring cells generally have the same uplink-downlink configuration.

The point of time when the downlink is changed to the uplink or the time when the uplink is switched to the downlink is referred to as a switching point. The switch-point periodicity refers to a period in which switching between the uplink subframe and the downlink subframe is repeated in the same manner, and is 5 ms or 10 ms. For example, from the upward / downward setting 0, D-> S-> U-> U-> U is switched from the 0th to the 4th subframe, and from the 5th to the 9th subframe, -> S-> U-> U-> U. Since one subframe is 1 ms, the periodicity of the switching time point is 5 ms. That is, the periodicity at the switching time point is smaller than one radio frame length (10 ms), and the aspect of switching in the radio frame is repeated once.

The uplink-downlink configuration of Table 2 can be transmitted from the base station to the mobile station through the system information. The base station can notify the UE of the change of the uplink-downlink allocation status of the radio frame by transmitting only the index of the uplink-downlink configuration every time the uplink-downlink configuration is changed. Or the uplink-downlink configuration may be control information transmitted as broadcast information to all terminals in a cell via a broadcast channel.

FIG. 4 is a diagram illustrating an exemplary comparison between FDD, TDD, and FDD half-duplex schemes to which the present invention is applied. Hereinafter, a terminal operating in the FDD half-duplex mode will be briefly referred to as an HD-FDD terminal.

Referring to FIG. 4, the HD-FDD terminal transmits or receives uplink or downlink data for downlink transmission in one time instance (for example, one subframe) on the FDD band (downlink carrier and uplink carrier) . This does not require a duplexer design for the terminal, so a simple design of the terminal is possible. In particular, the implementation becomes simpler in a specific FDD band situation (for example, when the spacing between the downlink carrier and the uplink carrier is not large), thereby reducing the manufacturing cost of the terminal . While the base station operates in full-duplex mode.

Whether the HD-FDD performs downlink reception or uplink transmission depends on whether the UL grant is indicated in advance or the HARQ-ACK for downlink data transmission caused by the downlink grant It is determined by the presence or absence of reporting. That is, when an uplink transmission is indicated in advance by a UL grant in a specific subframe or an HARQ-ACK report for DL transmission is transmitted, the corresponding HD-FDD UE recognizes the uplink transmission in the subframe Otherwise, expect the reception of the downlink.

TDD can have different TDD uplink-downlink configurations between different subcarriers.

FIG. 5 is an explanatory diagram showing the difference in TDD uplink / downlink configuration between serving cells in an interband carrier aggregation according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 5, the TDD uplink / downlink configuration of the main serving cell is 0 (D, S, U, U, U, D, The link / downlink configuration is 5 (D, S, U, D, D, D, D, D, D, D). The difference between these is that subframes 3, 4, 6, 7, 8, and 9 are configured on different subframes on the primary serving cell and the primary serving cell. A subframe conflict or subframe inconsistency occurs in subframes 3, 4, 6, 7, 8, and 9 due to the TDD uplink / downlink configuration. A subframe conflict refers to a situation where the direction of a subframe transmission link in two or more compared serving cells is different, and the subframes become a collision subframe.

The operation of the terminal for the subframe conflict is different according to the capability of the terminal capable of simultaneously transmitting and receiving data in one subframe. For example, in a full-duplex mode in which data can be simultaneously transmitted and received in the corresponding conflict subframe, the UE may transmit the data on the main serving cell in an overlapping subframe such as subframe 3, 4, 7, 8, It is possible to perform downlink transmission on the first sub-serving cell while performing uplink transmission. On the other hand, in the half-duplex mode in which data transmission / reception is not possible simultaneously in the conflict-compliant subframe, communication can be performed in only one direction. Therefore, the terminal can perform communication in either one of the main serving cell and the first- Selects one serving cell, and performs communication with the base station based on the communication direction within the selected serving cell. Particularly, 3GPP 36.211 v11.3.0 defines an operation for a TDD terminal in which a plurality of serving cells can not simultaneously transmit and receive data in a corresponding CA with a different TDD uplink / downlink configuration.

FIG. 6 shows an example in which a TDD-FDD carrier aggregation scheme to which the present invention is applied is applied.

Referring to FIG. 6, the legacy TDD terminal 120 can receive the wireless communication service only through the TDD band, and the legacy FDD terminal 140 can receive the wireless communication service only through the FDD band. On the other hand, a TDD-FDD CA capable UE (UE) 100 can receive a wireless communication service through an FDD band and a TDD band, and simultaneously provide a CA-based wireless communication service through a TDD band carrier and an FDD band carrier Can receive.

For the TDD-FDD combining operation as described above, for example, the following deployment scenarios may be considered.

For example, when the FDD base station and the TDD base station are co-located (for example, CA scenarios 1 to 3), the FDD base station and the TDD base station are not located in the same place, but the ideal backhaul If connected (for example, CA scenario 4).

In another example, when the FDD base station and the TDD base station are not co-located and are connected to a non-ideal backhaul (for example, small cell scenarios 2a, 2b, and macro-macro scenarios).

In addition, the following prerequisites may be considered for TDD-FDD carrier aggregation (CA).

First, terminals supporting the TDD-FDD combining operation can access legacy FDD single mode carrier and legacy TDD single mode carrier.

Second, legacy FDD terminals and terminals supporting the TDD-FDD combining operation can camp on and connect to a part of the FDD carrier, which is a part of the FDD / TDD network.

Third, legacy TDD terminals and terminals supporting the TDD-FDD combining operation can camp on and connect to the TDD carrier, which is a part of the combined FDD / TDD network.

Fourth, a network architecture enhancement may be considered to facilitate the TDD-FDD combining operation. However, keeping minimum network architecture changes is still a major concern from the operator's perspective.

Also, in supporting the TDD-FDD combining operation, the following terminal capabilities may be considered.

FIG. 7 shows examples of terminal capabilities for a TDD-FDD combining operation to which the present invention is applied.

(B) shows that the UE supports carrier aggregation between the TDD carrier and the FDD downlink carrier, and (c) shows that the UE supports the TDD carrier and the FDD downlink carrier. FIG. 7 Indicates that the UE supports carrier aggregation between the downlink subframe of the TDD carrier and the FDD carrier.

As described above, the UE can support various types of TDD-FDD carrier aggregation and can perform simultaneous reception (i.e., DL aggregation) in the FDD and TDD carriers. Second, the FDD and TDD Perform simultaneous transmission (i.e., UL aggregation) on carriers, and third, perform simultaneous transmission and reception (i.e., DL / UL aggregation) on FDD and TDD carriers.

Meanwhile, the UE can establish dual connectivity through two or more base stations of the at least one serving cell. A dual connection is an operation in which the UE consumes radio resources provided by at least two different network points (e.g., a macro base station and a small base station) in a RRC_CONNECTED mode. In this case, the at least two different network points may be connected to a non-ideal backhaul. At this time, one of the at least two different network points may be referred to as a macro base station (or a master base station or an anchor base station), and the remainder may be referred to as a small base station (or a secondary base station or an assisting base station or a slave base station).

The terminal may support the TDD-FDD combining operation when the carrier aggregation (CA) and / or the dual connection are established in the terminal as described above. Hereinafter, the present invention will be described based on a case where a CA is set in a terminal, but the present invention can be applied to a case where a dual connection is established in a terminal.

In realizing the TDD-FDD combining operation, when the same subframe is composed of different subframe types (eg, a normal or a special subframe) on different bands and carrier phases (eg, TDD and FDD carrier) , It is necessary to define what kind of operation the terminal should perform.

Assume that a BS configures a plurality of serving cells in a UE and supports TDD-FDD CA among them. Here, the duplex scheme for each serving cell can be defined as TDD or FDD. The duplex scheme determined for each serving cell can be roughly divided into two cases. Case 1 is the case where the main serving cell is TDD and the secondary serving cell is FDD. Case 2 is the case where the main serving cell is FDD and the secondary serving cell is TDD. First, Case 1 will be described.

< Case  1>

In Case 1, when the base station (or network) sets the main serving cell to TDD and the secondary serving cell to FDD, three different subframe types such as Table 3 may occur during one subframe according to the subframe number have.

Case number Main serving cell Secondary serving cell Case 1-1 DL subframe DL and UL subframe Case 1-2 UL subframe DL and UL subframe Case 1-3 special subframe DL and UL subframe

As described above, even when a plurality of serving cells are configured in different duplex schemes, downlink reception / uplink transmission is performed according to the capabilities of the UE (i.e., whether or not the UE can simultaneously transmit / receive data on a plurality of carriers in the conflicting subframe) The transmission operation of the link may be changed. Hereinafter, a method of supporting a new operation according to whether a terminal supports full-duplex capable of simultaneously transmitting and receiving data on a plurality of carriers or not supports half-duplex operation is defined. Also, an appropriate operation method is described according to the relationship between the types of different subframes for each Case and the performance of the UE.

1) For a full-duplex terminal

FIG. 8 shows an example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.

Referring to FIG. 8, a TDD scheme is applied to a main serving cell (PCell), and subframes are configured according to a TDD uplink / downlink configuration # 1. In the sub-serving cell (SCell), the FDD scheme is applied, and downlink and uplink are configured in all subframes.

At this time, cases 1-1, 1-2 and 1-3 according to Table 3 can be generated. In Case 1-1, the full-duplex UE can expect to receive downlink transmission in both the main serving cell and the secondary serving cell, and the uplink signal and / or uplink channel transmission in the secondary serving cell It is possible. That is, there is no restriction on the uplink transmission and the downlink reception of the full-duplex terminal in the conflicting subframe.

Next, in the case of Case 1-2, the full-duplex UE can transmit the uplink signal and / or the uplink channel in both the main serving cell and the secondary serving cell, Reception can be expected. That is, there is no restriction on the uplink transmission and the downlink reception of the full-duplex terminal in the conflicting subframe.

Next, when the main serving cell is a special subframe as shown in Case 1-3, the full-duplex UE expects to receive the downlink transmission in the DwPTS section of the main serving cell and the secondary serving cell as shown in FIG. And it is possible to transmit the uplink signal and / or the uplink channel in the UpPTS section of the main serving cell and in the secondary serving cell. However, in a guard period (GP) of a special subframe on the main serving cell, the UE can not perform downlink reception or uplink transmission although the UE has full-duplex capability, Resources can be wasted.

In this case, utilizing the advantages of full-duplex, additional efficient resource utilization is possible. Because the special sub-frame on the main serving cell was to switch from DL-to UL transmission in the TDD intrinsic half-duplex operation (single carrier view (Rel-8)). However, the terminal may have capability and implementation for full-duplex operation for TDD-FDD combining operation. Thus, this embodiment discloses a method for more efficient use of resources in TDD, rather than utilizing the special sub-frame of the main serving cell as it is for the existing purpose. This method involves spanning a special subframe into an existing downlink subframe or an uplink subframe, or even changing to a new format subframe.

10 is a view for explaining a method of spanning a special subframe into a DL subframe or an UL subframe in TDD-FDD carrier aggregation according to an example of the present invention.

Referring to FIG. 10, the first embodiment spans a special sub-frame on the main serving cell into a downlink sub-frame, and the second embodiment spans a special sub-frame on the main serving cell into an uplink sub- . Here, 'span' may have the meaning of 'assumption', 'consideration', 'conversion' or 'substitution' depending on the form of the embodiment.

In the first and second embodiments, the UE and the base station must previously know the special subframe in Case 1-3 as a downlink subframe or an uplink subframe (hereinafter simply referred to as "spanning") in advance . In order for the terminal and the base station to recognize the information about the spanning, the following three methods can be defined.

As an example, for a full-duplex terminal, in Case 1-3, a standard of a terminal and a base station can be established to span a special subframe on the main serving cell into a downlink subframe (or uplink subframe). That is, a protocol for the spanning is established from the time of manufacturing (or implementing) the terminal and the base station.

As another example, in case 1-3 for a full-duplex terminal, the base station may send a spanning message to the terminal instructing to span a special subframe on the main serving cell to a downlink subframe (or uplink subframe) have. The spanning message may be an upper layer signaling such as a system information block (SIB) or an RRC message (common to all TDD-FDD carrier aggregation capable terminals). For example, the spanning message may indicate that the special subframe of Case 1-3 is a downlink subframe (or uplink subframe) for a full-duplex terminal.

As another example, the full-duplex UE transmits a message to the base station informing the base station that the special subframe on the main serving cell can be spanned into the downlink subframe (or uplink subframe) in Case 1-3 You can give. Here, the notification message may be included in CA capability information indicating the CA performance of the UE. For example, when i) a DL CA (when carrier aggregation in the downlink is configured) and a single UL (when the uplink carrier aggregation is not configured), a special subframe is spanned into a DL subframe, and ii ) Spanning a special subframe into a UL sub-frame for a single DL and an UL CA, and iii) For a DL CA and an UL CA, a special subframe based on a protocol or a spanning message for spanning is a downlink subframe or an uplink May be spanned into subframes and may be spanned into downlink subframes taking DL CA into consideration first.

FIG. 11 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to the present embodiment. 11, both the legacy TDD terminal 1 and the legacy TDD terminal 2 have DwPTS, GP, and UpPTS. However, the full-duplex terminal 3 supporting the TDD-FDD carrier aggregation has a special sub- Frame or uplink sub-frame to utilize the resources of the GP section. In addition, a full-duplex terminal supporting TDD-FDD carrier aggregation in the same special subframe can coexist with a conventional TDD terminal.

FIG. 12 is a view for explaining a method of converting a special subframe into a new format subframe in the TDD-FDD carrier aggregation according to another example of the present invention.

Referring to FIG. 12, in the third embodiment, GP is absorbed in the DwPTS, and GP in the fourth embodiment is absorbed in the UpPTS. The third and fourth embodiments are different from the first and second embodiments in that a GP in a special subframe is removed, but a new format (or type) is not spanned into one downlink subframe or uplink subframe, ) Subframe. Accordingly, it is possible to efficiently utilize resources and provide a balanced downlink / uplink resource allocation ratio.

In the third and fourth embodiments, the UE and the BS need to know each other before spanning the special subframe in Case 1-3 into a new format subframe. In order for the terminal and the base station to recognize the information about the spanning, the following two methods can be defined.

As an example, in case 1-3 for a full-duplex terminal, a standard for a terminal and a base station may be established to span a special sub-frame on a main serving cell into a sub-frame of a new format. That is, a protocol for the spanning is established from the time of manufacturing (or implementing) the terminal and the base station.

As another example, in case 1-3 for a full-duplex terminal, the base station may send a spanning message to the terminal instructing to span a special sub-frame on the main serving cell to a new format sub-frame. The spanning message may be an upper layer signaling such as a system information block (SIB) or an RRC message (common to all TDD-FDD carrier aggregation capable terminals). For example, the spanning message may indicate that the special subframe in Case 1-3 is a new format subframe for the full-duplex terminal.

FIG. 13 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to the present embodiment. Referring to FIG. 13, both the legacy TDD terminal 1 and the legacy TDD terminal 2 have DwPTS, GP, and UpPTS. On the other hand, the full-duplex terminal 3 supporting the TDD-FDD carrier aggregation can span the special-subframe into the subframe of the new format having only the DwPTS and the UpPTS to utilize the resources of the GP period. In addition, a full-duplex terminal supporting TDD-FDD carrier aggregation in the same special subframe can coexist with a conventional TDD terminal.

2) For half-duplex terminal (based on main serving cell)

A half-duplex terminal based on a main serving cell configuration means a terminal capable of operating either one of transmission and reception of data based on a sub-frame of a main serving cell in a conflicting sub-frame of a plurality of serving cells.

FIG. 14 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.

Referring to FIG. 14, a TDD scheme is applied to a main serving cell (PCell), and subframes are configured according to TDD uplink / downlink configuration # 1. In the sub-serving cell (SCell), the FDD scheme is applied, and downlink and uplink are configured in all subframes.

At this time, cases 1-1, 1-2 and 1-3 according to Table 3 can be generated. In each conflict case sub-frame for each case, the half-duplex terminal must select only one directional link. At this time, the link can be basically selected based on the configured sub-frame of the main serving cell. That is, the half-duplex operation in the auxiliary serving cell follows the sub-frame of the main serving cell. For example, if the primary serving cell is a downlink sub-frame, the half-duplex terminal may expect to receive a downlink transmission in the secondary serving cell. In other words, for the half-duplex terminal, the uplink signal and the uplink channel in the secondary serving cell are not transmitted.

In Case 1-1, since the main serving cell is the downlink sub-frame, the half-duplex UE can expect to receive downlink transmission in both the main serving cell and the secondary serving cell Frame), the uplink signal and the uplink channel in the secondary serving cell are not transmitted.

Next, in Case 1-2, the half-duplex terminal can transmit the uplink signal and / or the uplink channel in both the main serving cell and the secondary serving cell (because the main serving cell is the uplink sub-frame) , Reception on the downlink transmission in the secondary serving cell can not be expected.

Next, the case where the main serving cell is a special subframe as shown in Case 1-3 is shown in FIG. In the downlink case, a half-duplex terminal can not expect to receive a downlink transmission in OFDM symbols on a secondary serving cell that overlaps the UpPTS. For example, a half-duplex terminal can not expect to receive PDSCH, EPDCCH, PMCH, PRS transmissions in the secondary serving cell. However, since the DwPTS section in the special subframe may coincide with the PCFICH and / or PDCCH section of the secondary serving cell, the half-duplex terminal may transmit the DwPTS in the main serving cell and the PCFICH and / or PDCCH in the secondary serving cell, Reception of a downlink signal / channel which can be received in a section overlapping with the DwPTS can be expected.

On the other hand, in the case of the uplink, uplink signals / channels are not transmitted in OFDM symbols overlapping with the half-duplex DwPTS. For example, the UE does not transmit the PUSCH and the uplink signal / channel in the secondary serving cell. However, since the UpPTS interval in the special subframe may coincide with the sounding reference signal (SRS) of the secondary serving cell, the half-duplex UE may use the UpPTS in the primary serving cell and the SRS in the secondary serving cell, It is possible to transmit a transmittable uplink signal / channel in an interval overlapping another UpPTS.

3) For half-duplex terminals (based on UL transmission)

A half-duplex terminal based on the presence or absence of UL transmission means a terminal capable of either transmitting or receiving data based on the presence or absence of UL transmission in a conflicting sub-frame of a plurality of serving cells.

16 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied. 16 is a diagram illustrating an example of an uplink for uplink transmission (i.e., PUSCH transmission) in a main serving cell and / or a secondary serving cell for subframes 2, 3 and 4 of the first radio frame and subframes 8 and 9 of the next radio frame. A PDCCH indicating a grant (uplink grant) or an HARQ-ACK transmission or a PDCCH indicating an SPS release is previously transmitted.

Referring to FIG. 16, a TDD scheme is applied to a main serving cell (PCell), and subframes are configured according to a TDD uplink / downlink scheme # 1. In the sub-serving cell (SCell), the FDD scheme is applied, and downlink and uplink are configured in all subframes.

At this time, cases 1-1, 1-2 and 1-3 according to Table 3 can be generated. A PDSCH for requesting an uplink grant or an HARQ-ACK transmission for uplink transmission (i.e., PUSCH transmission) or a PDCCH for instructing release of SPS is transmitted in advance The UE determines the subframe direction in the secondary serving cell. For example, if an uplink grant for uplink transmission or a PDSCH requesting HARQ-ACK transmission or a PDSCH indicating an SPS release is transmitted to subframes 2 and 3 on a secondary serving cell, 2, 3 do not expect reception of downlink transmission. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the secondary serving cell in the conflicting subframe. Since the subframes 2 and 3 are the uplink subframes for the main serving cell, the UE does not expect to receive the downlink transmission in the subframes 2 and 3 of the main serving cell.

In Case 1-1, if the uplink grant for the uplink transmission on the secondary serving cell or the PDSCH for requesting the HARQ-ACK transmission or the PDSCH for instructing the release of the SPS are not previously instructed in the conflicting subframe, The duplex terminal does not transmit the uplink signal and the uplink channel on the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if an uplink grant for uplink transmission on the secondary serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH for instructing the release of SPS is previously indicated in the conflicting subframe, the half- It is not expected to receive downlink transmissions on the primary serving cell and / or the secondary serving cell. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the secondary serving cell in the conflicting subframe.

Next, in Case 1-2, if the uplink grant for uplink transmission in both the primary serving cell and the secondary serving cell is not indicated in the conflicting subframe, the half- The uplink signal and the uplink channel are not transmitted on the main serving cell and the secondary serving cell. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if the uplink grant for the uplink transmission on the primary serving cell or the secondary serving cell or the PDSCH for requesting the HARQ-ACK transmission or the PDCCH for instructing the release of the SPS are previously indicated in the conflicting subframe, the half- It is not expected to receive the downlink transmission on the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the main serving cell or the secondary serving cell in the conflicting subframe.

Next, when the main serving cell is a special subframe as in Case 1-3, if the uplink grant for uplink transmission on the secondary serving cell in the conflicting subframe has not been indicated in advance, the half- The uplink signal and the uplink channel are not transmitted to the main serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if the uplink grant for the uplink transmission on the secondary serving cell is previously indicated in the conflicting subframe, the half-duplex terminal transmits the downlink transmission on the primary serving cell and / or the secondary serving cell in the conflicting subframe Do not expect. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the UpPTS and / or the secondary serving cell of the main serving cell in the conflicting subframe.

< Case  2>

Case 2 is the case where the main serving cell is FDD and the secondary serving cell is TDD. In Case 2, when the base station (or network) sets the main serving cell to FDD and the secondary serving cell to TDD, three different subframe types such as Table 4 may occur during one subframe according to the subframe number have.

Case number Main serving cell Secondary serving cell Case 2-1 DL and UL subframe DL subframe Case 2-2 DL and UL subframe UL subframe Case 2-3 DL and UL subframe Special subframe

As described above, even when a plurality of serving cells are configured in different duplex schemes, downlink reception / uplink transmission is performed according to the capabilities of the UE (i.e., whether or not the UE can simultaneously transmit / receive data on a plurality of carriers in the conflicting subframe) The transmission operation of the link may be changed. Hereinafter, a method of supporting a new operation according to whether a terminal supports full-duplex capable of simultaneously transmitting and receiving data on a plurality of carriers or not supports half-duplex operation is defined. Also, an appropriate operation method is described according to the relationship between the types of different subframes for each Case and the performance of the UE.

1) For a full-duplex terminal

FIG. 17 shows another example of a subframe structure according to the TDD-FDD carrier aggregation to which the present invention is applied.

Referring to FIG. 17, the main serving cell (PCell) is applied to the FDD scheme, and downlink and uplink are configured in all subframes. The sub-serving cell SCell is applied to the TDD scheme and the subframes are configured according to the TDD uplink / downlink scheme # 0.

At this time, cases 2-1, 2-2 and 2-3 according to Table 4 may occur. In case 2-1, the full-duplex UE can expect to receive downlink transmissions in both the main serving cell and the secondary serving cell, and the uplink signal and / or uplink channel transmission in the main serving cell It is possible. That is, there is no restriction on the uplink transmission and the downlink reception of the full-duplex terminal in the conflicting subframe.

Next, in the case of Case 2-2, the full-duplex UE can transmit the uplink signal and / or the uplink channel in both the main serving cell and the secondary serving cell, Reception can be expected. That is, there is no restriction on the uplink transmission and the downlink reception of the full-duplex terminal in the conflicting subframe.

Next, when the secondary serving cell is a special subframe as shown in Case 2-3, the full-duplex UE can expect to receive the downlink transmission in the DwPTS section of the secondary serving cell and the downlink transmission in the primary serving cell, It is possible to transmit the uplink signal and / or the uplink channel in the UpPTS section of the serving cell and the main serving cell. However, in a guard period (GP) of a special subframe on a secondary serving cell, the UE can not perform downlink reception or uplink transmission, and resources may be wasted.

In this case, utilizing the advantages of full-duplex, additional efficient resource utilization is possible. Because the special sub-frame on the serving cell was to switch from DL-to UL transmission in the TDD intrinsic half-duplex operation (single carrier view (Rel-8)). However, the terminal may have capability and implementation for full-duplex operation for TDD-FDD combining operation. Therefore, this embodiment discloses a method for more efficient use of resources in TDD, rather than utilizing a special sub-frame of a secondary serving cell as it is for a conventional use. This method involves spanning a special subframe into an existing downlink subframe or an uplink subframe, or even changing to a new format subframe. In this case, only the conditions in which the main serving cell and the secondary serving cell are FDD and TDD are different, respectively, but the spanning method in FIGS. 10 to 13 can be applied to this embodiment as it is.

2) For half-duplex terminals (based on UL transmission)

A half-duplex terminal based on the presence or absence of UL transmission means a terminal capable of either transmitting or receiving data based on the presence or absence of UL transmission in a conflicting sub-frame of a plurality of serving cells.

In the main serving cell (PCell), the FDD scheme is applied, and downlink and uplink are configured in all subframes. The sub-serving cell SCell is applied to the TDD scheme and the subframes are configured according to the TDD uplink / downlink scheme # 0.

At this time, cases 2-1, 2-2 and 2-3 according to Table 4 may occur. In each conflict case subframe for each case, the half-duplex terminal transmits a PDSCH requesting uplink grant or HARQ-ACK transmission for uplink transmission (i.e., PUSCH transmission) The direction of the subframe is determined. For example, if an uplink grant for uplink transmission is transmitted to the subframes 2 and 3 on the main serving cell and / or the secondary serving cell, the UE transmits the uplink grant for downlink transmission in the main serving cell in the corresponding subframe 2, Do not expect to receive. Since the subframes 2 and 3 are uplink subframes for the secondary serving cell, the UE does not expect to receive the downlink transmission in the subframes 2 and 3 of the secondary serving cell. For reference, the method that follows the direction of the main serving cell considered in Case 1 may not be considered in Case 2. This is because additional consideration is required because there are two different directions in the main serving cell and PDSCH or SPS release requesting uplink grant or HARQ-ACK transmission for uplink transmission (i.e., PUSCH transmission) Since the operation of the half-duplex terminal, which determines the direction of the subframe according to whether the PDCCH indicating the PDCCH indicating the PDCCH is transmitted in advance, is sufficient for the implementation.

In Case 2-1, if the uplink grant for the uplink transmission on the main serving cell or the PDSCH for requesting HARQ-ACK transmission or the PDCCH for instructing the release of the SPS is not previously instructed in the conflicting subframe, The duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if the uplink grant for uplink transmission on the main serving cell is previously indicated in the conflicting subframe, the half-duplex terminal expects to receive the downlink transmission on the main serving cell and the secondary serving cell in the conflicting subframe I never do that. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe.

Next, in Case 2-2, the uplink grant for uplink transmission in the main serving cell or the secondary serving cell in the conflicting sub-frame, or the PDSCH for requesting HARQ-ACK transmission or the PDCCH for instructing to release the SPS, The half-duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell and the secondary serving cell in the conflicting sub-frame. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell in the conflicting sub-frame. On the other hand, if the uplink grant for the uplink transmission on the primary serving cell or the secondary serving cell or the PDSCH for requesting the HARQ-ACK transmission or the PDCCH for instructing the release of the SPS are previously indicated in the conflicting subframe, the half- It is not expected to receive the downlink transmission on the main serving cell in the conflicting subframe. In other words, the half-duplex terminal may transmit the uplink signal and the uplink channel on the main serving cell and / or the secondary serving cell in the conflicting subframe.

Next, if the serving cell is a special subframe as shown in Case 2-3, the uplink grant for uplink transmission on the main serving cell or the PDSCH or SPS request for HARQ-ACK transmission in the conflicting subframe is instructed , The half-duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell and the secondary serving cell in the conflicting sub-frame. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if an uplink grant for uplink transmission on the main serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH for instructing the release of SPS is previously indicated in the conflicting subframe, the half- It is not expected to receive downlink transmissions on the primary serving cell and / or the secondary serving cell. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe.

18 is a signaling flowchart between a terminal and a base station according to an example of the present invention. Here, before performing each step, the BS may preliminarily generate a plurality of serving cells. And the UE and the BS support TDD-FDD carrier aggregation between the plurality of serving cells. Here, the duplex scheme for each serving cell can be defined as TDD or FDD.

Referring to FIG. 18, the terminal transmits a first message to a base station (S1800). In one example, the first message is UE capability information indicating that the UE is capable of performing simultaneous transmission and reception on multiple carriers or no simultaneous transmission and reception on multiple (TDD-FDD) carrier aggregation. a duplex mode field (or a simultaneous transmission and reception field), which is a field indicating whether or not the carriers are supported. As another example, the first message may be a notification message indicating that the main sub-frame or the special sub-frame on the secondary serving cell may be spanned into the downlink sub-frame (or uplink sub-frame). As another example, the first message may comprise a duplex mode field and a notification message.

The terminal and the base station communicate with each other according to a prescribed protocol in the conflicting subframe (S1805). (Whether full-duplex terminal or half-duplex terminal, or in the same sense, simultaneous transmission / reception of data on a plurality of serving cells) is performed between the main serving cell and the secondary serving cell according to whether the transmission / reception type is Case 1 or Case 2, The terminal and the base station can communicate with each other based on the embodiments disclosed throughout this specification.

For example, if the given environment is Case 1 and the terminal is a half-duplex terminal, the communication operation corresponding to the "<Case 1> and 2) main serving cell configuration based half- Can be performed by the terminal. In this case, the communication in the conflicting sub-frame of S1805 may include the following operations.

For example, in Case 1-1, since the main serving cell is a downlink sub-frame, the half-duplex UE can expect to receive downlink transmission in both the main serving cell and the secondary serving cell Frame), the uplink signal and the uplink channel in the secondary serving cell are not transmitted.

As another example, in Case 1-2, the half-duplex terminal can transmit the uplink signal and / or the uplink channel in both the main serving cell and the secondary serving cell (the main serving cell is the uplink sub- , It can not be expected to receive the downlink transmission in the secondary serving cell.

As another example, in Case 1-3, in the case of downlink, a half-duplex terminal does not expect reception for downlink transmission in OFDM symbols on a sub-serving cell that overlaps with UpPTS. For example, a half-duplex terminal can not expect to receive PDSCH, EPDCCH, PMCH, PRS transmissions in the secondary serving cell. However, since the DwPTS section in the special subframe may coincide with the PCFICH and / or PDCCH section of the secondary serving cell, the half-duplex terminal may transmit the DwPTS in the main serving cell and the PCFICH and / or PDCCH in the secondary serving cell, Reception of a downlink signal / channel which can be received in a section overlapping with the DwPTS can be expected. On the other hand, in the case of the uplink, uplink signals / channels are not transmitted in OFDM symbols overlapping with the half-duplex DwPTS. For example, the UE does not transmit the PUSCH and the uplink signal / channel in the secondary serving cell. However, since the UpPTS interval in the special subframe may coincide with the sounding reference signal (SRS) of the secondary serving cell, the half-duplex UE may use the UpPTS in the primary serving cell and the SRS in the secondary serving cell, It is possible to transmit a transmittable uplink signal / channel in an interval overlapping another UpPTS.

19 is a signaling flowchart between a terminal and a base station according to another example of the present invention. Here, before performing each step, the BS may preliminarily generate a plurality of serving cells. And the UE and the BS support TDD-FDD carrier aggregation between the plurality of serving cells. Here, the duplex scheme for each serving cell can be defined as TDD or FDD.

Referring to FIG. 19, the BS transmits a second message to the MS (S1900). As an example, the second message may include a spanning message instructing to span a special subframe on the main serving cell (or a secondary serving cell) into a downlink subframe (or uplink subframe). The second message may also be a higher layer signaling such as a system information block (SIB) or an RRC message (common to all TDD-FDD carrier aggregation capable terminals). For example, the spanning message may indicate that the special subframe of Case 1-3 is a downlink subframe (or uplink subframe) for a full-duplex terminal.

The terminal and the base station communicate with each other according to a prescribed protocol in the conflicting subframe (S1905). (Whether a full-duplex terminal or a half-duplex terminal, or in the same sense, simultaneous transmission of data on a plurality of serving cells) between the primary serving cell and the secondary serving cell, depending on whether the transmission / The terminal and the base station can communicate with each other based on the embodiments disclosed throughout this specification.

For example, if the given environment is Case 2 and the terminal is a half-duplex terminal based on UL transmission / reception, the communication operation corresponding to "<Case 2> and 2) half-duplex terminal" Can be performed. In this case, the communication in the conflicting sub-frame of S1905 may include the following operations.

As an example, in Case 2-1, if the uplink grant for uplink transmission on the main serving cell or the PDSCH for requesting HARQ-ACK transmission or the PDCCH for instructing the release of SPS is not previously instructed in the conflicting subframe, The half-duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if an uplink grant for uplink transmission on the main serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH for instructing the release of SPS is previously indicated in the conflicting subframe, the half- It is not expected to receive downlink transmissions on the primary and secondary serving cells. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe.

As another example, in Case 2-2, the uplink grant for the uplink transmission in the main serving cell or the secondary serving cell in the conflicting subframe, or the PDSCH for requesting the HARQ-ACK transmission or the PDCCH for instructing the release of the SPS If not instructed in advance, the half-duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell in the conflicting sub-frame. On the other hand, if the uplink grant for uplink transmission on the primary serving cell and / or the secondary serving cell in the conflicting subframe or PDCCH indicating the release of the SPS or PDSCH requesting HARQ-ACK transmission is indicated in advance, The UE does not expect to receive the downlink transmission on the main serving cell in the conflicting subframe. In other words, the half-duplex terminal may transmit the uplink signal and the uplink channel on the main serving cell and / or the secondary serving cell in the conflicting subframe.

As another example, in Case 2-3, the uplink grant for the uplink transmission on the main serving cell or the PDSCH for requesting the HARQ-ACK transmission or the PDSCH for instructing the release of the SPS in the conflicting subframe has not been previously instructed The half-duplex terminal does not transmit the uplink signal and the uplink channel on the main serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive the downlink transmission on the main serving cell and / or the secondary serving cell in the conflicting sub-frame. On the other hand, if an uplink grant for uplink transmission on the main serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH for instructing the release of SPS is previously indicated in the conflicting subframe, the half- It is not expected to receive downlink transmissions on the primary serving cell and / or the secondary serving cell. In other words, the half-duplex terminal can transmit the uplink signal and the uplink channel on the main serving cell in the conflicting subframe.

20 is a block diagram illustrating a terminal and a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 20, a terminal 2000 includes a receiving unit 2005, a terminal processor 2010, and a transmitting unit 2015. The terminal supports TDD-FDD carrier aggregation and can support at least one of full-duplex / half-duplex (main serving cell-based) / half-duplex (UL transmission based).

The receiver 2005 receives the second message and the downlink signal or channel from the base station 2050. In particular, receiver 2005 may receive downlink signals and / or channels in conflicting subframes in a manner defined in accordance with the present disclosure.

The terminal processor 2010 configures a main service cell and a secondary service cell, which are applied with different duplex schemes, on the terminal 2000 by carrier aggregation.

The terminal processor 2010 determines whether the transmission / reception type between the main serving cell and the secondary serving cell is Case 1 or Case 2 and whether the duplex performance of the UE (half-duplex terminal or half- Duplex terminal based on whether it is a duplex terminal or a UL-based transmission), it is possible to control the embodiments disclosed throughout this specification to operate.

As an example, if a given environment is Case 1 and the terminal 2000 is a full-duplex terminal, a special subframe in which a subframe conflict occurs can be spanned into a downlink subframe or an uplink subframe. Alternatively, the terminal processor 2010 may convert a special subframe in which a subframe conflict occurs to a new format subframe.

As another example, if the given environment is Case 2 and the terminal 2000 is a half-duplex half-duplex terminal based on UL transmission and presence, the terminal processor 2010 will be referred to herein as "<Case 2> Based half-duplex terminal ".

Meanwhile, the terminal processor 2010 generates the first message and sends it to the transmitter 2015.

The transmitting unit 2015 may perform the transmission of the uplink signal or the uplink channel according to the control of the terminal processor 2010. In addition, the transmitting unit 2015 can transmit the first message to the base station 2050.

The base station 2050 includes a transmitting unit 2055, a receiving unit 2060, and a base station processor 2065.

The transmitting unit 2055 may transmit the second message, the downlink signal, and / or the downlink channel to the terminal 2000. Here, the transmission of the downlink signal and / or the downlink channel is controlled by the base station processor 2065. For example, if the given environment is Case 1 and the terminal 2000 is a full-duplex terminal, the base station processor 2065 may span a special subframe in which a subframe conflict occurs to a downlink subframe or an uplink subframe can do. Or the base station processor 2065 may switch a special subframe in which a subframe conflict occurs to a new format subframe.

The receiving unit 2060 may receive the uplink signal and / or the uplink channel from the terminal 2000 or may receive the first message. Herein, the reception of the uplink signal and / or the uplink channel is controlled by the base station processor 2065.

The base station processor 2065 transmits and receives data between a main serving cell and a secondary serving cell in a transmission / reception type case and a duplex performance of the terminal 2000 (full-duplex terminal, half-duplex terminal based on main serving cell configuration, Based half-duplex terminal) that is capable of controlling various embodiments disclosed herein with respect to a combination of two factors.

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

Claims (10)

A method for performing communication by a terminal,
A step of constructing a primary serving cell (PCell) and a secondary serving cell (SCell) to which a different duplex scheme is applied in a terminal by carrier aggregation; And
Performing at least one of downlink reception and uplink transmission through two collision subframes with different transmission links in the main serving cell and the secondary serving cell, ,
Wherein the capability of the UE is a full-duplex, a half-duplex based on a sub-frame of the main serving cell, and a half- Wherein the downlink reception and the uplink transmission are selectively or simultaneously performed according to the different duplex scheme. The method according to claim 1,
A time division duplex (TDD) is applied to the main serving cell, an FDD is applied to the secondary serving cell, a special subframe is configured in the main serving cell, and the UE supports the full-
Wherein the special subframe is spanned into an uplink subframe or a downlink subframe. The method according to claim 1,
Wherein TDD is applied to the main serving cell, FDD is applied to the secondary serving cell, a special sub-frame is formed in the main serving cell, and the UE supports the full-duplex,
Wherein the special subframe is switched to a new format subframe consisting of only DwPTS and UpPTS. The method according to claim 2 or 3,
Characterized in that the spanning or switching of the special sub-frame is indicated by the base station. The method according to claim 1,
Further comprising the step of transmitting information on performance of the terminal to a base station. A terminal performing communication,
A terminal processor that configures a primary serving cell (PCELL) and a secondary serving cell (SCell) to which a different duplex scheme is applied in a terminal by carrier aggregation;
A receiver for performing downlink reception on two main collision subframes having different transmission links in the main serving cell and the secondary serving cell; And
And a transmitter for performing uplink transmission through the conflicting subframes,
The terminal processor determines whether the capability of the UE is full-duplex, half-duplex based on the sub-frame of the main serving cell, and presence / absence of the uplink transmission Wherein the control unit controls the receiving unit and the transmitting unit such that the downlink reception and the uplink transmission are selectively or simultaneously performed according to the different duplex scheme and which supports the half duplex scheme. The method according to claim 6,
A time division duplex (TDD) is applied to the main serving cell, an FDD is applied to the secondary serving cell, a special subframe is configured in the main serving cell, and the UE supports the full-
Wherein the special subframe is spanned into an uplink subframe or a downlink subframe. The method according to claim 6,
Wherein TDD is applied to the main serving cell, FDD is applied to the secondary serving cell, a special sub-frame is formed in the main serving cell, and the UE supports the full-duplex,
Wherein the special subframe is switched to a new format subframe consisting of only DwPTS and UpPTS. 9. The method according to claim 7 or 8,
Wherein the receiving unit receives from the base station a message instructing spanning or switching of the special subframe. The method according to claim 6,
Wherein the transmitting unit transmits information on performance of the terminal to the base station.

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