KR102157618B1 - 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 an apparatus and method for performing communication in a wireless communication system in which a duplex method is different for each serving cell.
This specification is a step of configuring a primary serving cell (PCell) and a secondary serving cell (SCell) to which different duplex schemes are applied to a terminal by carrier aggregation. And, on the primary serving cell and the secondary serving cell, performing at least one of downlink reception and uplink transmission through two conflicting subframes having different directions of a transmission link. It provides a method of performing communication by a terminal including.

Description

A device that performs communication in a wireless communication system that uses a different duplex method for each serving cell and its method {APPARATUS AND METHOD FOR PERFORMING COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM IN WHICH DIFFERENT DUPLEX SCHEME IS APPLIED TO DIFFERENT SERVING CELL}

The present invention relates to wireless communication, and more particularly, to an apparatus and method for performing communication in a wireless communication system in which a duplex method is different for each serving cell.

Radio resources used for wireless communication are generally defined in a frequency domain, a time domain, and a code domain. In wireless communication, a user equipment (UE) and a base station (BS) must each use a given radio resource. The radio path transmitted by the terminal to the base station is referred to as uplink, and the radio path transmitted by the base station to the terminal is referred to as downlink. Meanwhile, there is a need for a method of classifying radio resources used for downlink transmission and radio resources used for uplink transmission so that they do not overlap, and such a method is called a duplex.

As in the multiple access scheme for classifying different users, uplink and downlink can be distinguished in frequency and time domains. The duplex method consists of a half-duplex method, a method that cannot transmit and receive data simultaneously within one unit of time, and a full-duplex method, which can transmit and receive data at the same time. have. In the half-duplex method, transmission is impossible when the terminal (or base station) is receiving data, and reception is impossible when the terminal (or base station) is transmitting data. In other words, it provides only uni-directional communication within one unit of time.

In the full-duplex method, there is a frequency division duplex (FDD) method that divides uplink and downlink by frequency, and in the half-duplex method, a time division duplex (TDD) half-duplex method that divides uplink and downlink by time. And, there is an FDD half-duplex scheme that divides uplink and downlink into both frequency and time.

In the FDD scheme, since uplink and downlink are classified in the frequency domain, data transmission and reception between the base station and the terminal can be continuously performed in the time domain in each link. Since the FDD scheme is symmetrically allocating frequencies to uplink and downlink, it is widely used because it is appropriate for symmetric services such as voice calls, but recently, TDD is used for asymmetric services such as Internet services. Since the method is suitable, research on this is actively being conducted.

Since the TDD scheme can allocate time slots of different ratios to the uplink and downlink, there is an advantage that it is suitable for an asymmetric service. Another advantage of the TDD scheme is that uplink and downlink are transmitted and received in the same frequency band, so that the uplink and downlink channel states are almost identical. Therefore, when a signal is received, the channel state can be estimated immediately, which is suitable for array antenna technology. The TDD method uses the entire frequency band as uplink or downlink, but separates uplink and downlink in a time domain, so that it is used as an uplink for a certain period of time and a downlink for another certain time. Data transmission and reception cannot be performed simultaneously between the base station and the terminal.

Meanwhile, frequency resources are saturated as of the present, and various technologies are used in a wide range of frequency bands. For this reason, as a method to secure a broadband bandwidth to meet the higher data rate requirements, each of the scattered bands is designed to satisfy the basic requirements for operating an independent system, and a number of bands are integrated into one system. Carrier aggregation (CA), which is a concept that is grouped together, is introduced. In this case, each independently operable band or carrier is defined as a component carrier (CC). With the advent of a carrier aggregation system, an ACK/NACK signal corresponding to a plurality of CCs must be transmitted.

Recently, TDD-FDD carrier aggregation, which aggregates a carrier in an FDD band (hereinafter referred to as an FDD carrier) and a carrier in a TDD band (hereinafter, referred to as a TDD carrier), has been considered. TDD-FDD carrier aggregation may be referred to as a TDD-FDD combining scheme. TDD-FDD carrier aggregation may or may not be supported according to the capability of the UE. However, in implementing TDD-FDD carrier aggregation, the same subframe in different bands and carriers (eg TDD and FDD carriers) is in different subframe types (eg normal or special subframe). When configured, the terminal has not yet been determined as to what operation to perform.

An object of the present invention is to provide an apparatus and method for performing communication in a wireless communication system in which a duplex method is different for each serving cell.

Another technical problem of the present invention is to provide a method for a terminal supporting TDD-FDD carrier aggregation to operate in conflicting subframes according to a duplex scheme applied differently for each serving cell according to its capability.

Another technical problem 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, a method of performing communication by a terminal is provided. The method includes configuring a primary serving cell (PCell) and a secondary serving cell (SCell) to which different duplex schemes are applied to a terminal by carrier aggregation, And performing at least one of downlink reception and uplink transmission on the primary serving cell and the secondary serving cell through two conflicting subframes having different directions of a transmission link. do.

Here, the capability of the terminal is full-duplex, a half-duplex based on a subframe of the primary serving cell, and the presence or absence of the uplink transmission. The downlink reception and the uplink transmission may be selectively or simultaneously performed according to which half-duplex is supported and the different duplex schemes.

According to another aspect of the present invention, a terminal for performing communication is provided. The terminal is a terminal processor that configures a primary serving cell (PCell) and a secondary serving cell (SCell) to which different duplex schemes are applied to the terminal by carrier aggregation , On the primary serving cell and the secondary serving cell, a receiver for performing downlink reception through two conflicting subframes having different directions of a transmission link, and uplink through the conflicting subframes It includes a transmission unit that performs link transmission.

The UE processor has the capability of the UE based on full-duplex, a half-duplex based on a subframe of the primary serving cell, and the presence or absence of the uplink transmission. The receiving unit and the transmitting unit may be controlled so that the downlink reception and the uplink transmission are selectively or simultaneously performed according to which half-duplex is supported and the different duplex schemes.

According to the present invention, in the context of carrier aggregation between carriers using different duplex schemes, for supporting TDD-FDD carrier aggregation according to different subframe types on different carriers and capabilities of a terminal during one subframe. New behavior 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 multi-carrier system to which the present invention is applied.
3 is an example of a radio frame structure to which the present invention is applied.
4 is an exemplary diagram comparing FDD, TDD and FDD half-duplex schemes to which the present invention is applied.
5 is an explanatory diagram showing differences in TDD uplink/downlink configurations between serving cells during inter-band carrier aggregation according to an example of the present invention.
6 shows an example in which the TDD-FDD joint operation technique to which the present invention is applied is applied.
7 is an example of terminal capabilities for a TDD-FDD combination operation to which the present invention is applied.
8 shows an example of a subframe configuration according to TDD-FDD carrier aggregation to which the present invention is applied.
9 shows a method of operating a full-duplex terminal when the primary serving cell is a special subframe.
10 is a diagram illustrating a method of spanning a special subframe into a downlink subframe or an uplink subframe in TDD-FDD carrier aggregation according to an example of the present invention.
11 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to this embodiment.
12 is a diagram illustrating a method of converting a special subframe into a subframe of a new format in TDD-FDD carrier aggregation according to another example of the present invention.
13 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to this embodiment.
14 shows another example of a subframe configuration according to TDD-FDD carrier aggregation to which the present invention is applied.
15 illustrates a method of operating a terminal when the primary serving cell is a special subframe.
16 illustrates another example of a subframe configuration according to TDD-FDD carrier aggregation to which the present invention is applied.
17 illustrates another example of a subframe configuration according to 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 showing a terminal and a base station according to an example of the present invention.

Hereinafter, some embodiments will be described in detail through exemplary drawings in the present specification. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present specification, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present specification, a detailed description thereof will be omitted.

In addition, this specification describes a wireless communication network, and the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that governs the wireless communication network, or The work can be done at a terminal coupled to the network.

According to the embodiments of the present invention, the meaning of transmitting the control channel may be interpreted as the meaning of transmitting the control information 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 and packet data. The wireless communication system 10 includes at least one base station (BS). Each base station 11 provides a communication service for a specific cell (15a, 15b, 15c). Cells can be further divided into multiple areas (referred to as sectors).

The terminal 12 (mobile station, MS) 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, and a PDA. (personal digital assistant), wireless modem (wireless modem), handheld device (handheld device) can be referred to as other terms. The base station 11 may be referred to as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, a femto base station, a home nodeB, a relay, and the like. . Cell is meant to encompass all of the various coverage areas such as megacell, macrocell, microcell, picocell, 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 downlink, the transmitter may be a part of the base station 11 and the receiver may be a part of the terminal 12. In the uplink, the transmitter may be a part of the terminal 12 and the receiver may be a part of the base station 11. There are no restrictions on multiple access techniques applied to wireless communication systems. CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), FDMA (Frequency Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single Carrier-FDMA), OFDM-FDMA, OFDM-TDMA , OFDM-CDMA, such as various multiple access techniques can be used. For uplink transmission and downlink transmission, a Time Division Duplex (TDD) scheme transmitted using different times may be used, or a Frequency Division Duplex (FDD) scheme transmitted using different frequencies may be used.

Carrier aggregation (CA) supports a plurality of carriers and is also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CC). Each component carrier is defined by a bandwidth and a center frequency. Carrier aggregation is introduced to support increased throughput, prevent an increase in cost due to the introduction of a wideband radio frequency (RF) device, and ensure compatibility with existing systems. For example, if 5 component carriers are allocated as granularity of a carrier unit having a bandwidth of 20 MHz, a maximum bandwidth of 100 MHz can be supported.

Carrier aggregation can be divided into contiguous carrier aggregation between consecutive component carriers in the frequency domain and non-contiguous carrier aggregation between discontinuous component carriers. The number of carriers aggregated between downlink and uplink may be set differently. A case where the number of downlink component carriers and the number of uplink component carriers are the same is referred to as symmetric aggregation, and a case where the number of downlink component carriers is different is referred to as asymmetric aggregation.

The component carriers may have different sizes (ie, bandwidths). For example, when 5 component carriers are used to configure the 70MHz band, a 5MHz component carrier (carrier #0) + a 20MHz component carrier (carrier #1) + a 20MHz component carrier (carrier #2) + a 20MHz component carrier It may be configured as (carrier #3) + 5MHz component carrier (carrier #4).

Hereinafter, a multiple carrier system includes a system supporting 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. The serving cell may be defined as a component 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 primary serving cell is one that provides security input and non-access stratum (NAS) mobility information in the radio resource control (RRC) connection (establishment) or re-establishment state. It means 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 primary serving cell, and the at least one cell is referred to as a secondary serving cell. The set of serving cells configured for one terminal may consist of only one primary serving cell, or may consist of one primary serving cell and at least one secondary serving cell.

The downlink component carrier corresponding to the primary serving cell is referred to as a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary serving cell is called an uplink primary component carrier (UL PCC). In addition, in downlink, a component carrier corresponding to a secondary serving cell is referred to as a downlink sub-component carrier (DL SCC), and in uplink, a component carrier corresponding to a secondary serving cell is referred to as an uplink sub-component carrier (UL SCC). do. Only a downlink component carrier may correspond to one serving cell, or DL CC and UL CC may correspond together.

2 shows an example of a protocol structure for supporting a multi-carrier 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 in time division duplex (TDD) and/or frequency division duplex (FDD).

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

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

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

DCI format Explanation 0 Used for scheduling of PUSCH (uplink common channel) in an 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 a random access procedure initialized by a PDCCH instruction 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for simple scheduling of one PDSCH codeword and notification of MCCH change 1D Used for simple scheduling of one PDSCH codeword in one cell including precoding and power offset information 2 Used for PDSCH scheduling for UEs configured in spatial multiplexing mode 2A Used for PDSCH scheduling of terminals 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 transmission mode 10 (CoMP) 3 Used for transmission of TPC commands for PUCCH and PUSCH including 2-bit power adjustment 3A Used for transmission of TPC commands for PUCCH and PUSCH including single bit power adjustment 4 Used for PUSCH scheduling in a multi-antenna port transmission mode cell for uplink

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

Each field of the DCI is sequentially mapped to _n information bits a ₀ to a _{n -1} . For example, suppose that DCI is mapped to information bits having a total length of 44 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. DCI formats 0 and 4 may be referred to as an uplink (UL) grant.

On the other hand, cross-carrier scheduling is a resource allocation of a PDSCH transmitted through a different CC through a PDCCH transmitted through a specific component carrier and/or other than a component carrier that is basically linked to the specific component carrier. This is a scheduling method capable of allocating resources of PUSCH transmitted through other CCs. That is, the PDCCH and the PDSCH may be transmitted through different DL CCs, and the PUSCH may be transmitted through a UL CC other than the UL CC linked to the DL CC in which the PDCCH including the UL grant was transmitted.

When cross-carrier scheduling is performed, the UE can receive scheduling information (such as UL grant) through only a specific serving cell (or CC). Hereinafter, the serving cell (or CC) for cross-carrier scheduling may be referred to as a scheduling cell (or CC), and another serving cell (or CC) to which the scheduling cell (or CC) is scheduled is scheduled It may be called a (scheduled) cell (or CC). The scheduling cell may be referred to as an ordering cell, and the scheduled cell may be referred to as a following serving cell.

In such a system supporting cross-carrier scheduling, a carrier indicator indicating which DL CC/UL CC is transmitted through which PDSCH/PUSCH for which the PDCCH provides control information is required. A field including such a carrier indicator is hereinafter referred to as a carrier indication field (CIF). Hereinafter, that CIF is configured may mean that cross-carrier scheduling is configured.

The aforementioned cross-carrier scheduling can be classified into downlink cross-carrier scheduling and uplink cross-carrier scheduling. Downlink cross-carrier scheduling refers to a case in which a component carrier through which a PDCCH including resource allocation information and other information for PDSCH transmission is transmitted is different from a component carrier through which the PDSCH is transmitted. Uplink cross-carrier scheduling refers to a case where the component carrier through which the PDCCH including the UL grant for PUSCH transmission is transmitted is different from the UL component carrier through which the PUSCH is transmitted and the linked DL component carrier.

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 10 subframes, and one subframe includes two consecutive slots.

In the case of FDD, a carrier used for uplink transmission and a carrier used for downlink transmission are respectively present, and uplink transmission and downlink transmission may be simultaneously performed in one cell.

In the case of TDD, uplink transmission and downlink transmission are always temporally divided based on one cell. Since the same carrier is used for uplink transmission and downlink transmission, the base station and the terminal repeat switching 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. As shown, the special subframe may include a downlink portion (DwPTS), a guard period (GP), and an uplink portion (UpPTS). Therefore, when referred to as a DL subframe or a UL subframe, a special subframe may be included in some cases. The guard period is necessary to avoid interference between downlink and uplink, and neither downlink transmission nor uplink transmission is performed during the guard period.

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

Uplink/downlink configuration Conversion point cycle Subframe 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 represents a downlink subframe, U represents an uplink subframe, and S represents 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 number of downlink subframes and uplink subframes within one radio frame are different for each uplink-downlink configuration. Through various uplink-downlink configurations, the amount of resources allocated for uplink and downlink transmission can be asymmetrically given. In order to avoid severe interference between downlink and uplink between cells, neighboring cells generally have the same uplink-downlink configuration.

The time point at which the downlink is changed to the uplink or the time point at which the uplink is switched to the downlink is referred to as a switching point. The switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are switched in the same manner, and is 5ms or 10ms. For example, in the uplink/downlink setting 0, the 0th to the 4th subframe is converted to D->S->U->U->U, and the 5th to 9th subframes are D in the same way as before. ->S->U->U->U. Since one subframe is 1 ms, the periodicity at the time of switching is 5 ms. That is, the periodicity of the switching point is less than the length of one radio frame (10 ms), and the mode of switching within the radio frame is repeated once.

The uplink-downlink configuration of Table 2 may be transmitted from the base station to the terminal through system information. The base station can notify the UE of the change in the uplink-downlink allocation state of the radio frame by transmitting only the index of the uplink-downlink configuration whenever the uplink-downlink configuration is changed. Alternatively, the uplink-downlink configuration may be control information commonly transmitted to all terminals in the cell through a broadcast channel as broadcast information.

4 is an exemplary diagram comparing FDD, TDD and FDD half-duplex schemes to which the present invention is applied. Hereinafter, a terminal operating in an FDD half-duplex scheme is referred to as an HD-FDD terminal.

4, the HD-FDD terminal receives or transmits downlink transmission in one time instance (for example, one subframe) on the FDD band (downlink carrier and uplink carrier) Selectively perform. This does not require a duplexer design from the terminal, so a simple design of the terminal is possible. In particular, implementation is simpler in the context of a specific FDD band (e.g., when the spacing between a downlink carrier and an uplink carrier is not large), thereby reducing the manufacturing cost of the terminal. . On the other hand, the base station operates in full duplex.

On what basis HD-FDD performs downlink reception or uplink transmission, whether an UL grant is indicated in advance or HARQ-ACK for downlink data transmission generated by an indication of a downlink grant It is determined by the presence or absence of a report. That is, when uplink transmission is indicated in advance by an uplink grant in a specific subframe or when a HARQ-ACK report for downlink transmission is transmitted, the corresponding HD-FDD terminal recognizes as uplink transmission in the subframe. Otherwise, it expects to receive downlink.

In TDD, different subcarriers may have different TDD uplink-downlink configurations.

5 is an explanatory diagram showing a difference in TDD uplink/downlink configurations between serving cells when inter-band carrier aggregation according to an example of the present invention.

5, the TDD uplink/downlink configuration of the primary serving cell is 0 (D,S,U,U,U,D,S,U,U,U), and the TDD uplink of the first secondary serving cell The link/downlink configuration is 5(D,S,U,D,D,D,D,D,D,D). Looking at the difference between them, in subframes 3, 4, 6, 7, 8, and 9, different subframes are configured on the primary serving cell and the first secondary serving cell. Subframe conflict or subframe inconsistency occurs in subframes 3, 4, 6, 7, 8, and 9 due to the TDD uplink/downlink configuration. Subframe conflict refers to a situation in which the directions of subframe transmission links in two or more serving cells to be compared are different, and the subframes become conflicting subframes.

The operation of the terminal for subframe conflict is different according to the capability of the terminal whether data transmission/reception is possible in one subframe at the same time. For example, in the case of a full-duplex mode in which data can be transmitted and received at the same time in the conflicting subframe, the UE is in the conflicting subframe such as subframes 3, 4, 7, 8, 9 in FIG. Simultaneously with performing uplink transmission, downlink reception may be performed on the first secondary serving cell. On the other hand, in the case of a half-duplex mode in which data transmission and reception is not possible at the same time in the conflicting subframe, communication is possible in only one direction, so that the terminal One serving cell is selected, and communication with the base station is performed based on the communication direction in the selected serving cell. In particular, 3GPP 36.211 v11.3.0 defines an operation for a TDD terminal in which data transmission/reception is not possible at the same time in a conflicting subframe for a CA in which a plurality of serving cells have different TDD uplink/downlink configurations.

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

Referring to FIG. 6, in the case of a legacy TDD terminal 120, a wireless communication service can be received only through a TDD band, and in the case of a legacy FDD terminal 140, a wireless communication service can be received only through an FDD band. On the other hand, in the case of a TDD-FDD CA capable terminal (UE, 100), a wireless communication service can be received through the FDD band and the TDD band, and CA-based wireless communication service is provided simultaneously through the TDD band carrier and the FDD band carrier. I can receive it.

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

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

As another example, when the FDD base station and the TDD base station are not disposed in the same place and are connected by a non-ideal backhaul (for example, small cell scenarios 2a, 2b, and macro-macro scenarios).

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

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

Second, legacy FDD terminals and terminals supporting a TDD-FDD combination operation may camp on and connect to an FDD carrier that is part of the FDD/TDD network in which the combination operation is performed.

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

Fourth, network architecture enhancement to facilitate the TDD-FDD combination operation may be considered. However, keeping the minimum network architecture change is still major from the operator's point of view and should be considered.

In addition, when the terminal supports the TDD-FDD combination operation, the following terminal capabilities may be considered.

7 is an example of terminal capabilities for a TDD-FDD combination operation to which the present invention is applied.

Referring to Figure 7, (a) indicates that the UE supports carrier aggregation between a TDD carrier and an FDD carrier, (b) indicates that the UE supports carrier aggregation between a TDD carrier and an FDD downlink carrier, and (c) is This 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 (ie, DL aggregation) on FDD and TDD carriers, and second, FDD and TDD Simultaneous transmission (ie, UL aggregation) may be performed on carriers, and third, simultaneous transmission and reception (ie, DL/UL aggregation) may be performed on FDD and TDD carriers.

Meanwhile, the terminal may establish dual connectivity through two or more of the base stations constituting at least one serving cell. Dual connectivity is an operation in which a corresponding terminal consumes radio resources provided by at least two different network points (eg, a macro base station and a small base station) in a radio resource control connection (RRC_CONNECTED) mode. In this case, the at least two different network points may be connected through a non-ideal backhaul. In this case, one of the at least two different network points may be called a macro base station (or a master base station or an anchor base station), and the other may be called a small base station (or a secondary base station or an assisting base station or a slave base station).

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

In implementing the TDD-FDD combining operation, when the same subframe is configured with different subframe types (eg normal or special subframe) on different bands and carriers (eg TDD and FDD carriers) , It should be defined what operation the terminal should perform.

Assume that a base station configures a plurality of serving cells in a terminal and supports TDD-FDD CA between them. Here, the duplex scheme for each serving cell may be determined as TDD or FDD. The duplex scheme determined for each serving cell can be largely classified into two cases. Case 1 is when the primary serving cell is TDD and the secondary serving cell is FDD. Case 2 is a case where the primary 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 primary serving cell as TDD and the secondary serving cell as FDD, three different subframe types as shown in Table 3 may occur during one subframe according to the subframe number. have.

Case number Main serving cell Department 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

Even when multiple serving cells are configured in different duplex schemes as described above, downlink reception/upload according to the capabilities of the terminal (i.e., whether the terminal can simultaneously transmit and receive data on multiple carriers in conflicting subframes) The transmission operation of the link may vary. Hereinafter, a method of supporting a new operation is defined according to whether the terminal supports full-duplex capable of simultaneously transmitting and receiving data on a plurality of carriers, or half-duplex operation that does not. In addition, a relationship between different subframe types for each case and an appropriate operation method according to the performance of the terminal are disclosed.

1) In the case of a full-duplex terminal

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

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

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

Next, even in Case 1-2, the full-duplex terminal can transmit an uplink signal and/or an uplink channel in both the primary serving cell and the secondary serving cell, and for downlink transmission in the secondary serving cell. You can expect to receive it. That is, there is no restriction on uplink transmission and downlink reception of a full-duplex terminal in conflicting subframes.

Next, in the case where the primary serving cell is a special subframe as in Case 1-3, the full-duplex terminal as shown in FIG. 9 is expected to receive the DwPTS section of the primary serving cell and the downlink transmission in the secondary serving cell. It is possible to transmit an uplink signal and/or an uplink channel in the UpPTS section of the primary serving cell and the secondary serving cell. However, although the actual terminal has full-duplex capability, the terminal cannot perform downlink reception or uplink transmission in a guard period (GP) of a special subframe on the primary serving cell. Resources can be wasted.

In this case, additional efficient resource utilization is possible by utilizing the advantages of full-duplex. This is because the special subframe on the primary serving cell is to switch to DL->UL transmission in the half-duplex operation (single carrier viewpoint (Rel-8)) of TDD. However, the UE may have the capability and implementation for a full-duplex operation for a TDD-FDD combination operation. Accordingly, this embodiment discloses a method for more efficient resource utilization in TDD, rather than using a special subframe of a primary serving cell as it is for an existing purpose. This method includes spanning a special subframe into an existing downlink subframe or an uplink subframe, or changing to a subframe of a new format altogether.

10 is a diagram illustrating a method of spanning a special subframe into a downlink subframe or an uplink subframe in TDD-FDD carrier aggregation according to an example of the present invention.

Referring to FIG. 10, the first embodiment spans a special subframe on a primary serving cell to a downlink subframe, and the second embodiment spans a special subframe on a primary serving cell to an uplink subframe. Is to do. Here,'span' may mean'home','considered','conversion', or'substitute' depending on the form of the embodiment.

In the first and second embodiments, the UE and the base station must know in advance that the special subframe in Case 1-3 is spanned as a downlink subframe or an uplink subframe (hereinafter, referred to as spanning briefly). . In order for the terminal and the base station to mutually recognize the information on the spanning, the following three methods may be defined.

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

As another example, for a full-duplex terminal, the base station may transmit a spanning message instructing to span a special subframe on the primary serving cell to a downlink subframe (or uplink subframe) in Case 1-3. have. The spanning message may be higher layer signaling such as a system information block (SIB) or an RRC message (common to all terminals capable of supporting TDD-FDD carrier aggregation). 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 terminal transmits a message to the base station notifying the base station that the special subframe on the primary serving cell can be spanned as a downlink subframe (or uplink subframe) in Case 1-3. Can give. Here, as the notification message, it may be included in CA capability information indicating carrier aggregation (CA) capability of the terminal. For example, when i) DL CA (when carrier aggregation in the downlink is configured) and single UL (when carrier aggregation in uplink is not configured), a special subframe is spanned as a downlink subframe, and ii ) In the case of single DL and UL CA, a special subframe is spanned as an uplink subframe, and iii) In the case of DL CA and UL CA, a special subframe is a downlink subframe or uplink based on the spanning protocol or spanning message. It may be spanned as a subframe, and may be spanned as a downlink subframe in consideration of DL CA first.

11 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to this embodiment. Referring to FIG. 11, both legacy TDD terminal 1 and legacy TDD terminal 2 have DwPTS, GP, and UpPTS, but full-duplex terminal 3 supporting TDD-FDD carrier aggregation has a special subframe as a whole downlink subframe. It is spanned as a frame or an uplink subframe to utilize the resources of the GP interval. In addition, a full-duplex terminal supporting TDD-FDD carrier aggregation and an existing TDD terminal that does not coexist within the same special subframe.

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

Referring to FIG. 12, in the third embodiment, the GP is absorbed by the DwPTS, and in the fourth embodiment, the GP is absorbed by the UpPTS. In the third and fourth embodiments, compared to the first and second embodiments, the GP in the special subframe is the same, but the new format (or type) is not spanned into one downlink subframe or uplink subframe. ) To define the subframe. Accordingly, it is possible to provide an advantage of efficiently utilizing resources and a balanced downlink/uplink resource allocation ratio.

In the third and fourth embodiments, the UE and the base station should know each other in advance that the special subframe in Case 1-3 is spanned into a subframe of a new format. In order for the terminal and the base station to mutually recognize the information on the spanning, the following two methods may be defined.

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

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

13 shows how a special subframe is spanned for a full-duplex terminal supporting TDD-FDD carrier aggregation according to this 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, in the full-duplex terminal 3 supporting TDD-FDD carrier aggregation, a special subframe is spanned into a subframe of a new format having only DwPTS and UpPTS, so that the resources of the GP interval can be utilized. In addition, a full-duplex terminal supporting TDD-FDD carrier aggregation and an existing TDD terminal that does not coexist within the same special subframe.

2) In case of half-duplex terminal (based on primary serving cell setting)

A half-duplex terminal based on primary serving cell configuration refers to a terminal capable of operating only one of data transmission or reception based on a subframe of a primary serving cell in conflicting subframes of a plurality of serving cells.

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

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

At this time, Cases 1-1, 1-2, and 1-3 according to Table 3 may occur. In conflicting subframes for each case, the half-duplex terminal should select only a link in one direction. In this case, the link may be basically selected based on the configured subframe of the primary serving cell. That is, the half-duplex operation in the secondary serving cell follows the subframe of the primary serving cell. For example, if the primary serving cell is a downlink subframe, the half-duplex terminal can expect reception of downlink transmission in the secondary serving cell. In other words, for a half-duplex terminal, an uplink signal and an uplink channel in a secondary serving cell are not transmitted.

In case 1-1, since the primary serving cell is a downlink subframe, the half-duplex terminal can expect to receive downlink transmission in both the primary serving cell and the secondary serving cell (the primary serving cell is a downlink subframe. Because it is a frame), uplink signals and uplink channels are not transmitted in the secondary serving cell.

Next, in case of Case 1-2, the half-duplex terminal can transmit an uplink signal and/or an uplink channel in both the primary serving cell and the secondary serving cell (because the primary serving cell is an uplink subframe). , It is not possible to expect reception for downlink transmission in the secondary serving cell.

Next, as in Case 1-3, a case in which the primary serving cell is a special subframe is shown in FIG. 15. In the case of downlink, the half-duplex terminal cannot expect to receive downlink transmission in OFDM symbols on the secondary serving cell that overlap with the UpPTS. For example, a half-duplex terminal cannot expect to receive transmission of PDSCH, EPDCCH, PMCH, and PRS in a 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 is the DwPTS in the primary serving cell and the PCFICH and/or PDCCH in the secondary serving cell, and others. It is possible to expect reception of a downlink signal/channel that can be received in a section overlapping with the DwPTS.

Meanwhile, in the case of uplink, an uplink signal/channel is not transmitted in OFDM symbols overlapping the half-duplex DwPTS. For example, the UE does not transmit PUSCH and uplink signals/channels in the secondary serving cell. However, since the UpPTS section in the special subframe may coincide with the sounding reference signal (SRS) of the secondary serving cell, the half-duplex terminal has the UpPTS in the primary serving cell and the SRS in the secondary serving cell, and In addition, uplink signals/channels that can be transmitted in a period overlapping the UpPTS can be transmitted.

3) In the case of a half-duplex terminal (based on the presence or absence of UL transmission)

The half-duplex terminal based on the presence or absence of UL transmission refers to a terminal capable of operating only one of data transmission or reception based on the presence or absence of UL transmission in conflicting subframes of a plurality of serving cells.

16 illustrates another example of a subframe configuration according to TDD-FDD carrier aggregation to which the present invention is applied. 16 is an uplink for uplink transmission (ie, PUSCH transmission) in a primary 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 It shows a case in which a PDSCH for requesting an uplink grant or HARQ-ACK transmission or a PDCCH indicating an SPS release is previously transmitted.

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

At this time, Cases 1-1, 1-2, and 1-3 according to Table 3 may occur. In conflicting subframes for each case, an uplink grant for uplink transmission (ie, PUSCH transmission) or a PDSCH requesting HARQ-ACK transmission or a PDCCH indicating SPS release is transmitted in advance Depending on whether or not, 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 PDCCH indicating SPS release is transmitted for subframes 2 and 3 on the secondary serving cell, the terminal is a subframe on the secondary serving cell. In 2 and 3, the reception of downlink transmission is not expected. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the secondary serving cell in the conflicting subframe. Here, since subframes 2 and 3 are uplink subframes for the primary serving cell, the UE naturally does not expect to receive downlink transmission in subframes 2 and 3 of the primary serving cell.

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

Next, in case of Case 1-2, if an uplink grant for uplink transmission in both the primary serving cell and the secondary serving cell in the conflicting subframe is not previously indicated, the half-duplex terminal is in the conflicting subframe. Uplink signals and uplink channels are not transmitted on the primary serving cell and the secondary serving cell. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on a primary serving cell or a secondary serving cell or a PDSCH requesting HARQ-ACK transmission or a PDCCH instructing SPS release is indicated in advance within a conflicting subframe, the half-duplex terminal In the conflicting subframe, reception of downlink transmission on the secondary serving cell is not expected. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the primary serving cell or the secondary serving cell in the conflicting subframe.

Next, as in Case 1-3, when the primary serving cell is a special subframe, if an uplink grant for uplink transmission on the secondary serving cell in the conflicting subframe is not previously indicated, the half-duplex terminal In conflicting subframes, uplink signals and uplink channels are not transmitted on the primary and secondary serving cells. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on a secondary serving cell is previously indicated in a conflicting subframe, the half-duplex terminal receives 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 may transmit an uplink signal and an uplink channel on the UpPTS and/or the secondary serving cell of the primary serving cell in the conflicting subframe.

< Case 2>

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

Case number Main serving cell Department 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

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

1) In the case of a full-duplex terminal

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

Referring to FIG. 17, the FDD scheme is applied to the primary serving cell (PCell), and downlink and uplink are configured in all subframes. In addition, the TDD scheme is applied to the secondary serving cell (SCell), and subframes are configured according to TDD uplink/downlink configuration #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 terminal can expect to receive downlink transmission in both the primary serving cell and the secondary serving cell, and transmission of an uplink signal and/or an uplink channel in the primary serving cell is It is possible. That is, there is no restriction on uplink transmission and downlink reception of a full-duplex terminal in conflicting subframes.

Next, even in case 2-2, the full-duplex terminal is capable of transmitting an uplink signal and/or an uplink channel in both the primary serving cell and the secondary serving cell, and for downlink transmission in the primary serving cell. You can expect to receive it. That is, there is no restriction on uplink transmission and downlink reception of a full-duplex terminal in conflicting subframes.

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

In this case, additional efficient resource utilization is possible by utilizing the advantages of full-duplex. This is because the special subframe on the secondary serving cell is to switch to DL->UL transmission in the half-duplex operation of TDD (single carrier viewpoint (Rel-8)). However, the UE may have the capability and implementation for a full-duplex operation for a TDD-FDD combination operation. Accordingly, this embodiment discloses a method for more efficient resource utilization in TDD, rather than using a special subframe of a secondary serving cell as it is for an existing purpose. This method includes spanning a special subframe into an existing downlink subframe or an uplink subframe, or changing to a subframe of a new format altogether. In this case, there is only a difference only in the condition that the primary serving cell and the secondary serving cell are FDD and TDD, respectively, and the spanning method of FIGS. 10 to 13 may be applied as it is to the present embodiment.

2) In the case of a half-duplex terminal (based on the presence or absence of UL transmission)

The half-duplex terminal based on the presence or absence of UL transmission refers to a terminal capable of operating only one of data transmission or reception based on the presence or absence of UL transmission in conflicting subframes of a plurality of serving cells.

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

At this time, Cases 2-1, 2-2, and 2-3 according to Table 4 may occur. In conflicting subframes for each case, the half-duplex terminal has an uplink grant for uplink transmission (i.e., PUSCH transmission) or a PDSCH for requesting HARQ-ACK transmission or a PDCCH indicating release of the SPS. The direction of the subframe is determined according to whether it is transmitted to. For example, if an uplink grant for uplink transmission is transmitted for subframes 2 and 3 on the primary serving cell and/or on the secondary serving cell, the UE performs downlink transmission in the primary serving cell in the corresponding subframes 2 and 3. Do not expect to receive. Here, since subframes 2 and 3 are uplink subframes for the secondary serving cell, the UE naturally does not expect to receive downlink transmission in subframes 2 and 3 of the secondary serving cell. For reference, the method of following the direction of the primary serving cell considered in Case 1 may not be considered in Case 2. Because two different directions exist in the primary serving cell, additional consideration is required, and release of PDSCH or SPS that requires uplink grant or HARQ-ACK transmission for uplink transmission (ie, PUSCH transmission) This is because it is sufficient for implementation even assuming the operation of the half-duplex terminal that determines the direction of the subframe according to whether the PDCCH indicating the is transmitted in advance.

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

Next, in case of Case 2-2, an uplink grant for uplink transmission in both a primary serving cell or a secondary serving cell within a conflicting subframe or a PDSCH requesting HARQ-ACK transmission or a PDCCH indicating release of the SPS is pre- If not indicated, the half-duplex terminal does not transmit an uplink signal and an uplink channel on the primary serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on a primary serving cell or a secondary serving cell or a PDSCH requesting HARQ-ACK transmission or a PDCCH instructing SPS release is indicated in advance within a conflicting subframe, the half-duplex terminal In the conflicting subframe, reception of downlink transmission on the primary serving cell is not expected. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the primary serving cell and/or the secondary serving cell in the conflicting subframe.

Next, as in Case 2-3, when the secondary serving cell is a special subframe, an uplink grant for uplink transmission on the primary serving cell within a conflicting subframe or a PDSCH or SPS release requesting HARQ-ACK transmission is indicated. If the PDCCH is not previously indicated, the half-duplex terminal does not transmit an uplink signal and an uplink channel on the primary serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on the primary serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH indicating SPS release is indicated in advance within the conflicting subframe, the half-duplex terminal is the conflicting subframe Does not expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the primary 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, prior to performing each step, the step of configuring a plurality of serving cells in the terminal by the base station may occur in advance. In addition, it is assumed that the terminal and the base station support TDD-FDD carrier aggregation between the plurality of serving cells. Here, the duplex scheme for each serving cell may be determined as TDD or FDD.

Referring to FIG. 18, the terminal transmits a first message to the base station (S1800). As an example, the first message is UE capability information, and when the UE aggregates TDD-FDD carriers, it is a full-duplex (simultaneous transmission and reception on multiple carriers) or a half-duplex (no simultaneous transmission and reception on multiple). carriers) may include a duplex mode field (duplex mode field or simultaneous transmission and reception field) that indicates whether or not support is supported. As another example, the first message may be a notification message indicating that a special subframe on a primary serving cell or a secondary serving cell can be spanned as a downlink subframe (or uplink subframe). As another example, the first message may include a duplex mode field and a notification message.

The terminal and the base station communicate with each other in a conflicting subframe according to a predefined scheme (S1805). Depending on whether the transmission/reception type between the primary serving cell and the secondary serving cell is Case 1 or Case 2, and the duplex performance of the terminal (whether it is a full-duplex terminal or a half-duplex terminal, or in the same sense, data transmission and reception on multiple serving cells simultaneously) Availability), the terminal and the base station may communicate with each other based on the embodiments disclosed throughout the present specification.

For example, when a given environment is Case 1 and the terminal is a half-duplex terminal, a communication operation corresponding to "<Case 1> and 2) a half-duplex terminal based on primary serving cell configuration" shown in FIG. 14 The terminal can perform. In this case, communication in the conflicting subframe of S1805 may include the following operations.

As an example, in case 1-1, since the primary serving cell is a downlink subframe, the half-duplex terminal can expect to receive downlink transmission in both the primary serving cell and the secondary serving cell (the primary serving cell is Because it is a downlink subframe), transmission of an uplink signal and an uplink channel in a secondary serving cell is not performed.

As another example, in case of Case 1-2, the half-duplex terminal can transmit an uplink signal and/or an uplink channel in both a primary serving cell and a secondary serving cell (the primary serving cell is an uplink subframe. Because), reception of downlink transmission in the secondary serving cell cannot be expected.

As another example, in Case 1-3, in the case of downlink, the half-duplex terminal does not expect to receive downlink transmission in OFDM symbols on the secondary serving cell that overlap with the UpPTS. For example, a half-duplex terminal cannot expect to receive transmission of PDSCH, EPDCCH, PMCH, and PRS in a 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 is the DwPTS in the primary serving cell and the PCFICH and/or PDCCH in the secondary serving cell, and others. It is possible to expect reception of a downlink signal/channel that can be received in a section overlapping with the DwPTS. Meanwhile, in the case of uplink, an uplink signal/channel is not transmitted in OFDM symbols overlapping the half-duplex DwPTS. For example, the UE does not transmit PUSCH and uplink signals/channels in the secondary serving cell. However, since the UpPTS section in the special subframe may coincide with the sounding reference signal (SRS) of the secondary serving cell, the half-duplex terminal has the UpPTS in the primary serving cell and the SRS in the secondary serving cell, and In addition, uplink signals/channels that can be transmitted in a period overlapping the UpPTS can be transmitted.

19 is a signaling flowchart between a terminal and a base station according to another example of the present invention. Here, prior to performing each step, the step of configuring a plurality of serving cells in the terminal may occur in advance by the base station. In addition, it is assumed that the terminal and the base station support TDD-FDD carrier aggregation between the plurality of serving cells. Here, the duplex scheme for each serving cell may be determined as TDD or FDD.

19, the base station transmits a second message to the terminal (S1900). As an example, the second message may include a spanning message instructing to span a special subframe on a primary serving cell (or a secondary serving cell) to a downlink subframe (or uplink subframe). In addition, the second message may be higher layer signaling such as a system information block (SIB) or an RRC message (common to all terminals capable of supporting TDD-FDD carrier aggregation). 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 in a conflicting subframe according to a predefined scheme (S1905). Depending on whether the transmission/reception type between the primary serving cell and the secondary serving cell is Case 1 or Case 2, and the duplex performance of the terminal (whether it is a full-duplex terminal or a half-duplex terminal, or, as the same meaning, simultaneous data on multiple serving cells) Depending on whether or not transmission/reception is possible), the terminal and the base station may communicate with each other based on the embodiments disclosed throughout the present specification.

For example, if the given environment is Case 2 and the terminal is a half-duplex terminal based on the presence or absence of UL transmission, the terminal performs a communication operation corresponding to "<Case 2> and 2) a half-duplex terminal" in the present specification. Can be done. In this case, communication in the conflicting subframe of S1905 may include the following operations.

As an example, in case of Case 2-1, if an uplink grant for uplink transmission on the primary serving cell in a conflicting subframe or a PDSCH requesting HARQ-ACK transmission or a PDCCH indicating release of SPS is not previously indicated, The half-duplex terminal does not transmit an uplink signal and an uplink channel on the primary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on the primary serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH indicating SPS release is indicated in advance within the conflicting subframe, the half-duplex terminal is the conflicting subframe Does not expect to receive downlink transmission on the primary serving cell and the secondary serving cell. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the primary serving cell in the conflicting subframe.

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

As another example, in case of Case 2-3, an uplink grant for uplink transmission on a primary serving cell in a conflicting subframe, a PDSCH requesting HARQ-ACK transmission, or a PDCCH indicating SPS release is not indicated in advance. If yes, the half-duplex terminal does not transmit an uplink signal and an uplink channel on the primary serving cell and the secondary serving cell in the conflicting subframe. In other words, the half-duplex terminal can expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell in the conflicting subframe. On the other hand, if an uplink grant for uplink transmission on the primary serving cell or a PDSCH for requesting HARQ-ACK transmission or a PDCCH indicating SPS release is indicated in advance within the conflicting subframe, the half-duplex terminal is the conflicting subframe Does not expect to receive downlink transmission on the primary serving cell and/or the secondary serving cell. In other words, the half-duplex terminal may transmit an uplink signal and an uplink channel on the primary serving cell in the conflicting subframe.

20 is a block diagram showing a terminal and a base station according to an example of the present invention.

Referring to FIG. 20, the terminal 2000 includes a reception unit 2005, a terminal processor 2010, and a transmission unit 2015. The terminal supports TDD-FDD carrier aggregation, and may support at least one of full-duplex/half-duplex (based on primary serving cell)/half-duplex (based on whether or not UL transmission is present).

The receiving unit 2005 receives a second message and a downlink signal or channel from the base station 2050. In particular, the receiver 2005 may receive a downlink signal and/or a channel in conflicting subframes in a manner defined according to the present specification.

The terminal processor 2010 configures the primary serving cell and the secondary serving cell to which different duplex schemes are applied in the terminal 2000 by carrier aggregation.

The terminal processor 2010 determines whether the transmission/reception type between the primary serving cell and the secondary serving cell is Case 1 or Case 2, and the duplex performance of the terminal (a full-duplex terminal or a half-based subframe of the primary serving cell). Depending on whether it is a duplex terminal or a half-duplex terminal based on the presence or absence of UL transmission), the embodiments disclosed throughout the present specification may be controlled to operate.

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

As another example, when the given environment is Case 2, and the terminal 2000 is a half-duplex half-duplex terminal based on the presence or absence of UL transmission, the terminal processor 2010 refers to "<Case 2> and 2) UL transmission in this specification. It is possible to control the execution of a communication operation corresponding to "presence-based half-duplex terminal".

Meanwhile, the terminal processor 2010 generates a first message and sends it to the transmission unit 2015.

The transmission unit 2015 may transmit an uplink signal or an uplink channel under the control of the terminal processor 2010. Also, the transmission unit 2015 may transmit the first message to the base station 2050.

The base station 2050 includes a transmission unit 2055, a reception unit 2060, and a base station processor 2065.

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

The receiver 2060 may receive an uplink signal and/or an uplink channel from the terminal 2000 or may receive a first message. Here, reception of the uplink signal and/or uplink channel is controlled by the base station processor 2065.

The base station processor 2065 transmits/receives a case in the form of transmission/reception between the primary serving cell and the secondary serving cell, and the duplex performance of the terminal 2000 (is it a full-duplex terminal, a half-duplex terminal based on a primary serving cell configuration, or whether there is UL transmission) It is possible to control the combination of the two elements, such as whether the terminal is based on half-duplex terminals, so that various embodiments disclosed in the present specification can operate.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, 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 interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (12)

As a method of performing communication by a terminal,
Configuring a primary serving cell (PCell) and a secondary serving cell (SCell) to which different duplex schemes are applied to the terminal by carrier aggregation; And
On the primary serving cell and the secondary serving cell, performing at least one of downlink reception and uplink transmission through two conflicting subframes having different directions of a transmission link, ,
TDD is applied to the primary serving cell, FDD is applied to the secondary serving cell, a special subframe is configured in the primary serving cell, and the capability of the terminal supports full-duplex If so, the downlink reception and the uplink transmission are simultaneously performed,
The special subframe is characterized in that it is converted into a subframe of a new format consisting only of DwPTS and UpPTS.
The method of claim 1,
Based on the performance of the UE, the UE selects any of the full-duplex, a half-duplex based on a subframe of the primary serving cell, and a half duplex based on the presence or absence of the uplink transmission. How to perform communication, which is determined whether to support.
delete The method of claim 1,
The special subframe is spanned as an uplink subframe or a downlink subframe,
Spanning of the special subframe is characterized in that indicated by the base station, the method of performing communication.
The method of claim 1,
The method of performing communication, further comprising transmitting information on the performance of the terminal to a base station. As a terminal performing communication,
A terminal processor configured to configure a primary serving cell (PCell) and a secondary serving cell (SCell) to which different duplex schemes are applied to the terminal by carrier aggregation;
A receiving unit for performing downlink reception on the primary serving cell and the secondary serving cell through two conflicting subframes having different directions of a transmission link; And
Including a transmission unit for performing uplink transmission through the conflicting subframes,
TDD is applied to the primary serving cell, FDD is applied to the secondary serving cell, a special subframe is configured in the primary serving cell, and the capability of the terminal supports full-duplex In this case, the processor controls the receiving unit and the transmitting unit so that the downlink reception and the uplink transmission are simultaneously performed,
The special subframe is characterized in that it is converted into a subframe of a new format consisting of only DwPTS and UpPTS.
The method of claim 6,
Based on the performance of the UE, the UE selects any of the full-duplex, a half-duplex based on a subframe of the primary serving cell, and a half duplex based on the presence or absence of the uplink transmission. It is determined whether to support the terminal.
delete The method of claim 6,
The special subframe is spanned as an uplink subframe or a downlink subframe,
The receiving unit, characterized in that receiving from the base station a message indicating the spanning of the special subframe.
The method of claim 6,
The transmission unit, characterized in that for transmitting information on the performance of the terminal to the base station.
The method of claim 1,
The method of performing communication, characterized in that the switching of the special subframe is indicated by the base station.
The method of claim 6,
The receiving unit, characterized in that for receiving a message instructing to switch the special subframe from the base station.

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