KR20210017958A - Method and apparatus for performing dual connectivity for ues in wireless communication system - Google Patents

Abstract

The present invention relates to a communication method and system for converging a 5G communication system for supporting higher data transmission rates beyond a 4G system with a technology for IoT. The disclosure may be applied to intelligent services (such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services) based on the 5G communication technology and the IoT-related technology. The present invention discloses a method and device for controlling transmission power of uplink transmission in a wireless communication system.

Description

Method and apparatus for a terminal to perform dual access in a wireless communication system {METHOD AND APPARATUS FOR PERFORMING DUAL CONNECTIVITY FOR UES IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a method and apparatus for a terminal to perform dual access in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).

In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Giga (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed.

In addition, in the 5G system, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by techniques such as beamforming, MIMO, and array antenna. There is. As the big data processing technology described above, a cloud radio access network (cloud RAN) is applied as an example of the convergence of 5G technology and IoT technology.

On the other hand, various studies on transmission schemes of uplink control channels in communication systems are being conducted, and in particular, discussions about transmission schemes such as PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel) have been discussed from various angles. It is being done.

A terminal capable of dual access for LTE and NR can transmit and receive data for LTE and NR cells, respectively. In the case of dual access, the UE may be configured to support only one uplink transmission according to the UE's capability and whether a specific band combination is permitted. Accordingly, in the present invention, in a situation in which LTE TDD is a primary cell and NR is a secondary cell, it is possible to provide a method and an apparatus for a terminal to perform uplink transmission according to whether the terminal has dynamic power distribution capability.

Next, according to a specific band combination for a frequency for transmitting/receiving LTE and NR, the terminal's LTE is transmitted due to interference by IM (Inter-Modulation) or harmonic caused by uplink or NR uplink transmission transmitted by the terminal itself. Downlink reception or NR downlink reception may be affected by interference, and downlink reception performance may be degraded. Therefore, in the present invention, in a situation where LTE FDD is a primary cell and NR is a secondary cell, it is possible to provide a method and apparatus for avoiding an interference effect on LTE downlink reception or NR downlink reception caused by LTE uplink or NR uplink transmission. have.

The present invention for solving the above problem is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

According to an embodiment of the present invention, a method and apparatus for solving an interference problem by a dual access terminal in a wireless communication system can be provided.

1 is a diagram showing a basic structure of a time-frequency domain in an LTE system.
2 is a diagram illustrating an example of operation of a subframe in an LTE TDD frame.
3 is a diagram illustrating another example of operation of a subframe in an LTE TDD frame.
4 is a diagram illustrating an example in which 5G services are multiplexed and transmitted in one system.
5 is a diagram showing an example of a configuration of a communication system to which the present invention is applied.
6 is a diagram showing a problem situation to be solved by the present invention.
7 is a diagram illustrating uplink transmission according to Embodiment 1 of the present invention.
8 is a diagram illustrating uplink transmission according to Embodiment 2 of the present invention.
9A is a diagram illustrating an operation procedure of a base station according to embodiments proposed in the present invention.
9B is a diagram illustrating a terminal operation procedure according to embodiments proposed in the present invention.
10 is a diagram showing a second problem situation to be solved by the present invention.
11 is a diagram showing a first interference situation to be solved by the present invention.
12 is a diagram showing a second interference situation to be solved by the present invention.
13A is a diagram illustrating a base station procedure according to embodiments proposed in the present invention.
13B is a diagram illustrating a terminal procedure according to embodiments proposed in the present invention.
14 is a diagram illustrating a base station apparatus according to embodiments of the present invention.
15 is a diagram illustrating a terminal device according to embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described in detail together with the accompanying drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in the present embodiment means software or hardware components such as FPGA or ASIC, and'~ unit' performs certain roles. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card.

Hereinafter, embodiments of the present invention will be described in detail together with the accompanying drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

In addition, in describing the embodiments of the present invention in detail, the OFDM-based wireless communication system, in particular, the 3GPP EUTRA standard will be the main object, but the main subject of the present invention is other communication systems having a similar technical background and channel type. In addition, it may be applied with slight modifications within the range not significantly departing from the scope of the present invention, which will be possible by judgment of a person skilled in the technical field of the present invention.

Meanwhile, research on coexisting new 5G communication (or referred to as NR communication in the present invention) and existing LTE communication in the same spectrum in a mobile communication system is in progress.

The present invention relates to a wireless communication system, and more specifically, a terminal in which different wireless communication systems coexist on one carrier frequency or a plurality of carrier frequencies and transmit and receive data in at least one communication system among different communication systems. It relates to a method and apparatus for transmitting and receiving data to and from each communication system.

In general, mobile communication systems have been developed to provide voice services while ensuring user activity. However, mobile communication systems are gradually expanding their range to not only voice but also data services, and have developed to the extent that they can provide high-speed data services. However, in a mobile communication system in which a service is currently provided, a lack of resources and users request a higher speed service, and thus a more advanced mobile communication system is required.

As one of the systems being developed as a next-generation mobile communication system in response to these demands, standard work for Long Term Evolution (LTE) is in progress in The 3rd Generation Partnership Project (3GPP). LTE is a technology that implements high-speed packet-based communication with a transmission speed of up to 100 Mbps. To this end, various methods have been discussed, for example, a method of reducing the number of nodes located on a communication path by simplifying the structure of a network, or a method of bringing wireless protocols as close to a wireless channel as possible.

The LTE system employs a hybrid automatic repeat request (HARQ) scheme in which a physical layer retransmits corresponding data when a decoding failure occurs in initial transmission. In the HARQ scheme, when the receiver fails to accurately decode data, the receiver transmits information (Negative Acknowledgement) notifying the transmitter of the decoding failure so that the transmitter can retransmit the corresponding data in the physical layer. The receiver increases the data reception performance by combining the data retransmitted by the transmitter with the data that has previously failed to be decoded. In addition, when the receiver correctly decodes data, information (ACK) notifying the transmitter of decoding success may be transmitted to enable the transmitter to transmit new data.

1 is a diagram showing the basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a downlink of an LTE system.

In FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, where N _symb (102) OFDM symbols are gathered to form one slot 106, and two slots are gathered to form one subframe 105. The length of the slot is 0.5 ms, and the length of the subframe is 1.0 ms. In addition, the radio frame 114 is a time domain unit consisting of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is composed of a total of N _BW (104) subcarriers.

The basic unit of a resource in the time-frequency domain is a resource element (RE) 112, which can be represented by an OFDM symbol index and a subcarrier index. The resource block 108 (Resource Block; RB or Physical Resource Block; PRB) is defined as N _symb (102) consecutive OFDM symbols in the time domain and N _RB (110) consecutive subcarriers in the frequency domain. Accordingly, one RB 108 is composed of N _symb x N _RB REs 112. In general, the minimum transmission unit of data is the RB unit. In the LTE system, in general, N _symb = 7, N _RB = 12, and N _BW and N _RB are proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the terminal. The LTE system operates by defining 6 transmission bandwidths. In the case of an FDD system operating by dividing downlink and uplink by frequency, a downlink transmission bandwidth and an uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 1 shows the correspondence between the system transmission bandwidth and the channel bandwidth (Channel bandwidth) defined in the LTE system. For example, in an LTE system having a 10 MHz channel bandwidth, a transmission bandwidth is composed of 50 RBs.

[Table 1]

In the case of downlink control information, it is transmitted within the first N OFDM symbols in the subframe. In general, N = {1, 2, 3}. Accordingly, the N value varies for each subframe according to the amount of control information to be transmitted in the current subframe. The control information includes a control channel transmission section indicator indicating how many OFDM symbols the control information is transmitted over, scheduling information for downlink data or uplink data, HARQ ACK/NACK signals, and the like.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from the base station to the terminal through downlink control information (DCI). Uplink (UL) refers to a radio link through which the UE transmits data or control signals to the base station, and downlink (DL) refers to a radio link through which the base station transmits data or control signals to the UE. DCI defines various formats, whether it is scheduling information for uplink data (uplink) grant, scheduling information for downlink data (DL (downlink) grant), compact DCI with a small size of control information The DCI format is applied and operated depending on whether or not, spatial multiplexing using multiple antennas is applied, and whether it is DCI for power control. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, is configured to include at least the following control information.

-Resource allocation type 0/1 flag: Notifies whether the resource allocation method is type 0 or type 1. Type 0 allocates resources in RBG (resource block group) units by applying a bitmap method. In the LTE system, the basic unit of scheduling is a resource block (RB) expressed in time and frequency domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows specific RBs to be allocated within the RBG.

-Resource block assignment: Notifies the RB assigned to data transmission. The resources expressed are determined according to the system bandwidth and resource allocation method.

-Modulation and coding scheme (MCS): Notifies the modulation method used for data transmission and the size of the transport block, which is the data to be transmitted.

-HARQ process number: Notifies the HARQ process number.

-New data indicator: Notifies whether HARQ is initial transmission or retransmission.

-Redundancy version: Notifies a redundancy version of HARQ.

-Transmission power control command for PUCCH (Transmit Power Control) command for PUCCH (Physical Uplink Control CHannel): Notifies the transmission power control command for the uplink control channel PUCCH.

The DCI is transmitted through a downlink physical downlink control channel (PDCCH) or EPDCCH (Enhanced PDCCH) through a channel coding and modulation process.

In general, the DCI is channel-coded independently for each terminal, and then each is configured and transmitted as an independent PDCCH. In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by an identifier (ID) of each terminal, and is spread over the entire system transmission band.

Downlink data is transmitted through a physical downlink shared channel (PDSCH), which is a physical channel for transmitting downlink data. The PDSCH is transmitted after the control channel transmission period, and scheduling information such as a specific mapping position and modulation scheme in the frequency domain is informed by the DCI transmitted through the PDCCH.

The base station notifies the UE of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size (TBS)) through the MCS composed of 5 bits among the control information constituting the DCI. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) intended to be transmitted by the base station.

The modulation schemes supported by the LTE system are Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), and 64QAM, and each modulation order (Q _m ) corresponds to 2, 4, and 6. That is, in the case of QPSK modulation, 2 bits per symbol, in the case of 16QAM modulation, 4 bits per symbol, and in the case of 64QAM modulation, 6 bits per symbol may be transmitted.

In 3GPP LTE Rel-10, a bandwidth extension technology was adopted to support a higher data transmission amount compared to LTE Rel-8. The technology, called bandwidth extension or carrier aggregation (CA), can increase the amount of data transmission by an extended band compared to an LTE Rel-8 terminal that transmits data in one band by extending a band. . Each of the above bands is called a component carrier (CC), and the LTE Rel-8 terminal is defined to have one component carrier for each of the downlink and the uplink. In addition, the downlink component carrier and the uplink component carrier connected to the SIB-2 are bundled together and referred to as a cell. The SIB-2 connection relationship between the downlink component carrier and the uplink component carrier is transmitted as a system signal or an upper signal. A terminal supporting CA may receive downlink data through a plurality of serving cells and transmit uplink data.

In Rel-10, when it is difficult for a base station to send a PDCCH (Physical Downlink Control Channel) from a specific serving cell to a specific terminal, the PDCCH is transmitted from another serving cell, and the corresponding PDCCH is the PDSCH (Physical Downlink Shared Channel) of another serving cell. As a field indicating that PUSCH (Physical Uplink Shared Channel) is indicated, a carrier indicator field (CIF) may be set to the terminal. CIF can be configured for a terminal supporting CA. The CIF was determined to indicate another serving cell by adding 3 bits to the PDCCH information in a specific serving cell, and the CIF is included only when the upper signal is set to perform cross carrier scheduling. If the upper signal is not set to perform cross-carrier scheduling or the upper signal is set to self-schedul, the CIF is not included, and in this case, cross-carrier scheduling is not performed. When the CIF is included in downlink assignment information (DL assignment), the CIF indicates a serving cell to which a PDSCH scheduled by DL assignment is to be transmitted, and the CIF is included in uplink resource allocation information (UL grant). When present, the CIF is defined to indicate a serving cell in which the PUSCH scheduled by the UL grant is to be transmitted.

As described above, in LTE Rel-10, carrier aggregation (CA), which is a bandwidth extension technology, is defined, so that a plurality of serving cells can be configured in the terminal. In addition, the terminal periodically or aperiodically transmits channel information for the plurality of serving cells to the base station for data scheduling of the base station. The base station schedules and transmits data for each carrier, and the terminal transmits A/N feedback for the data transmitted for each carrier. LTE Rel-10 is designed to transmit A/N feedback of up to 21 bits, and when A/N feedback and transmission of channel information overlap in one subframe, it is designed to transmit A/N feedback and discard channel information. . In LTE Rel-11, channel information of one cell is multiplexed together with A/N feedback, so that up to 22 bits of A/N feedback and channel information of one cell are transmitted in PUCCH format 3 in the transmission resource of PUCCH format 3. I did.

In LTE Rel-13, a scenario of setting up to 32 serving cells is assumed, and the concept of extending the number of serving cells to a maximum of 32 using a band in an unlicensed band, which is an unlicensed band as well as a licensed band, is completed. In addition, taking into account that the number of licensed bands such as LTE frequency is limited, it has completed providing LTE service in an unlicensed band such as 5 GHz band, and this is called LAA (Licensed Assisted Access). In LAA, by applying the carrier aggregation technology in LTE, it was supported to operate the licensed band LTE cell as a P cell and the unlicensed band LAA cell as an S cell. Therefore, as in LTE, the feedback generated in the LAA cell, which is an S cell, must be transmitted only in the P cell, and the downlink subframe and the uplink subframe can be freely applied to the LAA cell. Unless otherwise described herein, LTE refers to all of the LTE evolution technologies such as LTE-A and LAA.

In general, a TDD communication system uses a common frequency for downlink and uplink, but operates by separating transmission and reception of an uplink signal and a downlink signal in a time domain. In LTE TDD, uplink or downlink signals are classified and transmitted for each subframe. Depending on the traffic load of the uplink and downlink, the uplink/downlink subframes are equally divided and operated in the time domain, or more subframes are allocated to the downlink and operated, or more uplink is operated. Many subframes can be allocated and operated. In LTE, the length of the subframe is 1ms, and 10 subframes are gathered to form one radio frame.

[Table 2]

[Table 2] shows a TDD UL-DL configuration (TDD Uplink-Downlink configuration) defined in LTE (or, it may be referred to as a TDD uplink-downlink configuration). In [Table 2],'D' indicates a subframe set for downlink transmission,'U' indicates a subframe set for uplink transmission, and'S' indicates DwPTS (Dwonlink Pilot Time Slot), GP (Guard Period) and UpPTS (Uplink Pilot Time Slot) represents a special subframe (Special subframe). In the DwPTS, control information can be transmitted in downlink like a general subframe, and downlink data can be transmitted if the length of the DwPTS is sufficiently long according to the configuration state of the special subframe. The GP is a section for accommodating the transition of the transmission state from downlink to uplink, and its length is determined according to network configuration. The UpPTS is used for transmitting a sounding reference signal (SRS) of a terminal required to estimate an uplink channel state or for transmitting a random access channel (RACH) of a terminal for random access.

For example, in the case of TDD UL-DL configuration #6, downlink data and downlink control information can be transmitted in subframes #0, #5, and #9, and subframes #2, #3, #4, #7 , Uplink data and uplink control information can be transmitted to #8. In addition, in subframes #1 and #6 corresponding to the special subframe, downlink control information and downlink data can be transmitted in some cases, and SRS or RACH can be transmitted through the uplink.

In the TDD system, since downlink or uplink signal transmission is allowed only during a specific time period, the control channel for data scheduling, the scheduled data channel, and the HARQ ACK/NACK (or HARQ-ACK) channel corresponding to the data channel are mutually It is necessary to define a specific timing relationship between the uplink/downlink physical channels in the relationship.

First, in the LTE TDD system, a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission, and a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH), which is a physical channel through which uplink HARQ ACK/NACK corresponding thereto is transmitted. ), the uplink/downlink timing relationship is as follows.

When the UE receives the PDSCH transmitted in subframe n-k from the base station, the UE transmits uplink HARQ ACK/NACK for the PDSCH in uplink subframe n. In this case, k is a member of the set K, and K is as defined in [Table 3].

[Table 3]

[Table 4] shows that when the PDSCH is transmitted in each downlink subframe (D) or special subframe (S) n in each TDD UL-DL configuration, the corresponding uplink HARQ ACK/NACK is transmitted in any subframe It is reorganized according to the definition of [Table 3] above.

[Table 4]

2 is a diagram illustrating an example of operation of a subframe in a TDD frame.

[Table 4] described above will be described with reference to FIG. 2 as follows. In this case, FIG. 2 shows in which subframe the corresponding UL HARQ ACK/NACK is transmitted when the PDSCH is transmitted in each downlink or special subframe in TDD UL-DL configuration #6 of [Table 4]. It is a diagram exemplified according to the definition of [Table 4].

For example, the uplink HARQ ACK/NACK corresponding to the PDSCH 201 transmitted by the base station in subframe #0 of radio frame i is transmitted by the terminal in subframe #7 of radio frame i (203). In this case, downlink control information (DCI) including scheduling information for the PDSCH 201 is transmitted through the PDCCH in the same subframe as the subframe in which the PDSCH is transmitted. As another example, the uplink HARQ ACK/NACK corresponding to the PDSCH 205 transmitted by the base station in subframe #9 of radio frame i is transmitted by the terminal in subframe #4 of radio frame i+1 (207). Likewise, downlink control information (DCI) including scheduling information for the PDSCH 205 is transmitted through the PDCCH in the same subframe as the subframe in which the PDSCH is transmitted.

In the LTE system, downlink HARQ employs an asynchronous HARQ scheme in which the data retransmission time is not fixed. That is, when the base station receives a NACK feedback from the terminal for initial HARQ transmission data transmitted by the base station, the base station freely determines the transmission time of the next HARQ retransmission data by the scheduling operation. For the HARQ operation, the UE buffers the HARQ data determined as an error as a result of decoding the received data for the HARQ operation, and then performs the next HARQ retransmission data and combining. In this case, the maximum number of downlink HARQ processes for each TDD UL-DL configuration is defined as shown in [Table 5] in order to keep the reception buffer capacity of the terminal within a certain limit. One HARQ process is mapped to one subframe in the time domain.

[Table 5]

Referring to the example of FIG. 2, the terminal decodes the PDSCH 201 transmitted by the base station in subframe #0 of radio frame i, and transmits NACK to subframe #7 of radio frame i when it is determined that it is an error (203). do. Upon receiving the NACK, the base station configures retransmission data for the PDSCH 201 into the PDSCH 209 and transmits it together with the PDCCH. In the example of FIG. 2, reflecting that the maximum number of downlink HARQ processes of TDD UL-DL configuration #6 is 6 according to the definition of [Table 5], the retransmission data is in subframe #1 of radio frame i+1. It illustrates what is being transmitted. That is, a total of 6 downlink HARQ processes (211, 212, 213, 214, 215, 216) exist between the initial transmission PDSCH 201 and the retransmission PDSCH 209.

Unlike downlink HARQ in the LTE system, uplink HARQ employs a synchronous HARQ scheme in which data transmission time is fixed. That is, a physical uplink shared channel (PUSCH) that is a physical channel for uplink data transmission, a PDCCH that is a downlink control channel that precedes it, and a physical channel in which a downlink HARQ ACK/NACK corresponding to the PUSCH is transmitted. The uplink/downlink timing relationship of Indicator Channel) is fixed according to the following rules.

When the UE receives the PDCCH including the uplink scheduling control information transmitted from the base station in subframe n or the PHICH in which the downlink HARQ ACK/NACK is transmitted, the uplink data corresponding to the control information is transmitted in subframe n+k. It is transmitted through PUSCH. In this case, k is as defined in [Table 6].

[Table 6]

And when the UE receives a PHICH carrying a downlink HARQ ACK/NACK from the base station in subframe i, the PHICH corresponds to the PUSCH transmitted by the UE in subframe i-k. In this case, k is as defined in [Table 7].

[Table 7]

3 is a diagram illustrating another example of operation of a subframe in a TDD frame.

In particular, in FIG. 3, in the case of TDD UL-DL configuration #1, when a PDCCH or PHICH is transmitted in each downlink or special subframe, in which subframe the corresponding uplink PUSCH is transmitted, and again corresponds to the PUSCH. It is a diagram illustrating in which subframe the PHICH is transmitted according to the definitions of [Table 6] and [Table 7].

For example, the uplink PUSCH corresponding to the PDCCH or PHICH 301 transmitted by the base station in subframe #1 of radio frame i is transmitted by the terminal in subframe #7 of radio frame i (303). In addition, the base station transmits the PHICH or PDCCH corresponding to the PUSCH to the terminal in subframe #1 of radio frame i+1 (305). As another example, the uplink PUSCH corresponding to the PDCCH or PHICH 307 transmitted by the base station in subframe #6 of radio frame i is transmitted by the terminal in subframe #2 of radio frame i+1 (309). In addition, the base station transmits the PHICH or PDCCH corresponding to the PUSCH to the terminal in subframe #6 of radio frame i+1 (311).

In the LTE TDD system, in relation to PUSCH transmission, the downlink transmission of the PDCCH or PHICH corresponding to the PUSCH is limited in a specific downlink subframe, thereby ensuring the minimum transmission/reception processing time of the base station and the terminal. For example, in the case of TDD UL-DL configuration #1 of FIG. 3, in subframes #0 and #5, a PDCCH for scheduling the PUSCH or a PHICH corresponding to the PUSCH is not transmitted in downlink.

On the other hand, as a communication system after LTE, that is, a 5G wireless cellular communication system (hereinafter referred to as 5G or NR in this specification), various requirements such as users and service providers must be freely reflected. Services that satisfy the requirements can be supported.

Therefore, 5G is an increased mobile broadband communication (eMBB: Enhanced Mobile BroadBand, hereinafter referred to as eMBB in this specification), large-scale mechanical communication (mMTC: Massive Machine Type Communication, hereinafter referred to as mMTC in this specification), Various 5G-oriented services such as ultra-reliable and low-latency communications (URLLC: Ultra Reliable and Low Latency Communications, which will be referred to as URLLC in this specification) are provided with a maximum terminal transmission speed of 20 Gbps, a maximum terminal speed of 500 km/h, and a maximum delay of 0.5 ms. It can be defined as a technique for satisfying the requirements required for the selected terminal connected to each density 1,000,000 5G effort service requirement of the UE, such as / km ^2.

For example, in order to provide eMBB in 5G, it is necessary to provide a maximum terminal transmission rate of 20 Gbps in downlink and a maximum terminal transmission rate of 10 Gbps in uplink from the viewpoint of one base station. At the same time, the average transmission speed that the terminal can actually feel should be increased. In order to satisfy these requirements, there is a need for improvement in transmission/reception technology including more advanced multiple-input multiple-output transmission technology.

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G. In order to efficiently provide the Internet of Things, mMTC needs to support large-scale terminal access within a cell, improve terminal coverage, improved battery time, and reduce terminal cost. IoT is attached to various sensors and various devices to provide communication functions, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km ² ) within a cell. In addition, mMTC requires a wider coverage compared to the coverage provided by eMBB because the terminal is likely to be located in a shaded area such as a basement of a building or an area not covered by a cell due to the nature of the service. The mMTC is highly likely to be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time is required.

Finally, in the case of URLLC, as a cellular-based wireless communication used for a specific purpose, it is a service used for remote control of robots or mechanical devices, industrial automation, unmanned aerial vehicles, remote health control, and emergency situation notification. It should provide communications that provide ultra-low latency and ultra-reliability. For example, URLLC has a requirement to satisfy a maximum latency of less than 0.5 ms, and at the same time provide a packet error rate of 10 ^-5 or less. Therefore, for URLLC, a transmission time interval (TTI) smaller than a 5G service such as eMBB must be provided, and a design requirement is required to allocate a wide resource in a frequency band.

Services considered in the above-described 5G wireless cellular communication system should be provided as a single framework. That is, for efficient resource management and control, it is preferable that each service is integrated into one system, controlled and transmitted rather than independently operated.

4 is a diagram illustrating an example in which services considered in 5G are transmitted to one system.

In FIG. 4, the frequency-time resource 401 used by 5G may include a frequency axis 402 and a time axis 403. In FIG. 4, it is illustrated that 5G operates eMBB 405, mMTC 406, and URLLC 407 in one framework. In addition, as a service that can be additionally considered in 5G, an enhanced Mobile Broadcast/Multicast Service (eMBMS, 408) for providing a broadcast service on a cellular basis may be considered. Services considered in 5G, such as eMBB 405, mMTC 406, URLLC 407, and eMBMS 408, are Time-Division Multiplexing (TDM) or frequency within one system frequency bandwidth operated by 5G. It may be multiplexed and transmitted through frequency division multiplexing (FDM), and spatial division multiplexing may also be considered. In the case of the eMBB 405, it is preferable to occupy and transmit the maximum frequency bandwidth at a specific arbitrary time in order to provide the increased data transmission rate described above. Therefore, in the case of the eMBB 405 service, it is preferable to be TDM and transmitted within the system transmission bandwidth 401 with other services, but it is also preferable to be transmitted by FDM within the system transmission bandwidth and other services according to the needs of other services. .

In the case of the mMTC 406, unlike other services, an increased transmission interval is required to secure wide coverage, and coverage can be secured by repeatedly transmitting the same packet within the transmission interval. At the same time, in order to reduce the complexity of the terminal and the price of the terminal, the transmission bandwidth that the terminal can receive is limited. Considering such a requirement, it is preferable that the mMTC 406 is transmitted after being FDM with other services within the 5G transmission system bandwidth 401.

The URLLC 407 preferably has a short Transmit Time Interval (TTI) when compared to other services in order to satisfy the ultra-delay requirement required by the service. At the same time, since it is necessary to have a low coding rate in order to satisfy the ultra-reliability requirement, it is desirable to have a wide bandwidth in the frequency side. In consideration of the requirements of the URLLC 407, it is preferable that the URLLC 407 is TDM with other services within the transmission system bandwidth 401 of 5G.

Each of the services described above may have different transmission/reception techniques and transmission/reception parameters in order to satisfy the requirements required by each service. For example, each service can have different numerology according to each service requirement. Here, Numerology refers to the cyclic prefix (CP) length and subcarrier interval in a communication system based on Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA). spacing), OFDM symbol length, transmission interval length (TTI), and the like. As an example of having different numerology between the above services, the eMBMS 408 may have a longer CP length than other services. Since eMBMS transmits broadcast-based higher traffic, the same data can be transmitted in all cells.

At this time, if a signal received from a plurality of cells reaches within the CP length from the point of view of the UE, the UE can receive and decode all of these signals, thereby obtaining a single frequency network (SFN) diversity gain, Accordingly, there is an advantage in that a terminal located at a cell boundary can also receive broadcast information without coverage restrictions. However, in supporting eMBMS in 5G, if the CP length is relatively long compared to other services, waste due to CP overhead occurs, and thus a longer OFDM symbol length is required compared to other services. It requires a narrow subcarrier spacing.

In addition, as an example in which different numerology is used between services in 5G, in the case of URLLC, a shorter OFDM symbol length may be required as a smaller TTI is required compared to other services, and at the same time, a wider subcarrier interval may be requested.

Meanwhile, in 5G, one TTI may be defined as one slot, and may be composed of 14 OFDM symbols or 7 OFDM symbols. Therefore, in the case of subcarrier spacing of 15 KHz, one slot has a length of 1 ms or 0.5 ms. In addition, for emergency transmission and transmission to an unlicensed band in 5G, one TTI can be defined as one mini-slot or sub-slot, and one mini-slot is from 1 to (all OFDM symbols of the slot The number of OFDM symbols may be -1. For example, when the length of one slot is 14 OFDM symbols, the length of the mini slot may be determined from 1 to 13 OFDM symbols. The length, format, and repetition type of the slot or mini-slot may be defined in the standard or transmitted by a higher level signal or system information or a physical signal, and the terminal may receive it. In addition, instead of a mini-slot or a sub-slot, a slot may be determined from 1 to 14 OFDM symbols, and the length of the slot may be transmitted by an upper signal or system information, and thus the terminal may receive it.

The slot or mini slot can be defined to have various transmission formats, and can be classified into the following formats.

-Downlink dedicated slot (DL only slot or full DL slot): The downlink dedicated slot consists of only the downlink section, and only downlink transmission is supported.

-Downlink center slot (DL centric slot): The downlink center slot consists of a downlink section, a GP (or flexible symbol), and an uplink section, and the number of OFDM symbols in the downlink section is greater than the number of OFDM symbols in the uplink section.

-UL centric slot: The uplink center slot consists of a downlink section, a GP (or flexible symbol), and an uplink section, and the number of OFDM symbols in the downlink section is less than the number of OFDM symbols in the uplink section.

-Uplink dedicated slot (UL only slot or full UL slot): The uplink dedicated slot consists of only the uplink section, and only uplink transmission is supported.

In the above, only slot formats are classified, but minislots can be classified in the same classification method. That is, it can be classified into a downlink dedicated mini slot, a downlink center mini slot, an uplink center mini slot, and an uplink dedicated mini slot. In the above, the flexible symbol may be used as a guard symbol for transmission and reception switching, and may also be used for the purpose of channel estimation.

Hereinafter, in describing embodiments of the present invention in detail, LTE and 5G systems will be the main targets, but the main subject of the present invention is to broaden the scope of the present invention to other communication systems having similar technical backgrounds and channel types. It can be applied with slight modifications within the range not departing from, and this will be possible at the judgment of a person skilled in the technical field of the present invention.

In order to stably support mobility for the terminals of the existing mobile communication system while satisfying the requirements such as ultra-high-speed data service and ultra-low-delay service of the 5G system described above, a new beam popping technology operating in an ultra-high frequency band and a short TTI are applied. It is necessary to construct an integrated system through the combination of a radio access technology (New RAT) and an LTE/LTE-A system operating in a relatively low frequency band. In this case, the new radio access technology serves to satisfy the requirements of the 5G system, and the LTE/LTE-A system serves to stably support the mobility of the terminal.

FIG. 5 is a diagram illustrating an example of a configuration of a communication system to which the present invention is applied, and is a diagram illustrating an example of a configuration of an integrated system in which a base station in charge of the new radio access technology and an LTE/LTE-A base station are combined.

Referring to FIG. 5, small base stations 503, 505, and 507 with relatively small coverage 504, 506, and 508 may be disposed within the coverage 502 of the macro base station 501. In general, the macro base station 501 can transmit signals with relatively higher transmission power than the small base stations 503, 505, and 507, so that the coverage 502 of the macro base station 501 is small base stations 503, 505, and 507. There is a feature that is relatively larger than the coverage 504, 506, 508 of. In the example of FIG. 5, the macro base station represents an LTE/LTE-A system operating in a relatively low frequency band, and the small base stations 503, 505, 507 are new radio access technologies (NR or 5G) operating in the relatively high frequency band. ) Is applied.

The macro base station 501 and the small base stations 503, 505, and 507 are interconnected, and a certain amount of backhaul delay may exist according to the connection state. Therefore, it may not be desirable to exchange information sensitive to transmission delay between the macro base station 501 and the small base stations 503, 505, and 507.

Meanwhile, the example of FIG. 5 illustrates carrier coupling between the macro base station 501 and the small base stations 503, 505, and 507, but the present invention is not limited thereto, and carrier coupling between base stations located at different geographical locations. Applicable for For example, according to an embodiment, it can be applied to carrier coupling between a macro base station and a macro base station located at different locations, or carrier coupling between a small base station and a small base station located at different locations. Also, there is no restriction on the number of carriers to be combined. Alternatively, in the present invention, it is possible to apply the combination of carriers in the macro base station 501 and the combination of carriers in the small base stations 503, 505, and 507.

Referring to FIG. 5, the macro base station 501 may use a frequency f1 for transmitting a downlink signal, and the small base stations 503, 505, and 507 may use a frequency f2 for transmitting a downlink signal. At this time, the macro base station 501 may transmit data or control information to a predetermined terminal 509 through a frequency f1, and the small base stations 503, 505, and 507 may transmit data or control information through a frequency f2. . Through the carrier combination as described above, a base station applying a new radio access technology capable of supporting ultra-wideband in a high-frequency band provides ultra-high-speed data service and ultra-low-delay service, along with LTE/LTE-A technology in a relatively low-frequency band. The base station to which it is applied can support stable mobility of the terminal.

Meanwhile, the configuration illustrated in FIG. 5 is similarly applicable not only to downlink carrier coupling but also to uplink carrier coupling. For example, the terminal 509 may transmit data or control information to the macro base station 501 through a frequency f1' for transmitting an uplink signal. In addition, the terminal 509 may transmit data or control information to the small base stations 503, 505, and 507 through a frequency f2' for transmitting an uplink signal. The f1' may correspond to the f1, and the f2' may correspond to the f2. The uplink signal transmission of the terminal may be performed at different times or simultaneously to the macro base station and the small base station. In either case, due to the physical constraints of the power amplifier element of the terminal and the radio wave regulation on the transmission power of the terminal, the sum of the uplink transmission power of the terminal at any moment must be maintained within a predetermined threshold.

The operation of the terminal 509 that performs communication by accessing the macro base station 501 and the small base stations 503, 505, and 507 in the environment illustrated in FIG. 5 is referred to as dual connectivity (DC). When the terminal performs dual access, the following two configuration methods are possible.

First, after the terminal performs initial access to the macro base station 501 operating as an LTE/LTE-A system, configuration information for data transmission/reception for the macro base station is received from an upper signal (system or RRC signal). . Thereafter, setting information for data transmission/reception for the small base stations 503, 504, and 505 operating as an NR system is received from an upper signal (system or RRC signal) of the macro base station 501, and the small base stations 503, 504, and By performing random access to the 505, a dual connection state is established in which data transmission/reception is possible between the macro base station 501 and the small base stations 503, 504, and 505. At this time, the macro base station 501 operating in the LTE/LTE-A system is referred to as MCG (Master Cell Group), and the small base stations 503, 504, and 505 operating in the NR system are referred to as SCG (Secondary Cell Group). . It may be expressed that the UE is in the above-described dual access state that the UE is set to MCG using E-UTRA radio access (or LTE/LTE-A) and SCG using NR radio access. Alternatively, it may be expressed that the terminal is set to EN-DC (E-UTRA NR Dual Connectivity).

Second, after the terminal initially accesses the small base stations 503, 504, 505 operating as the NR system, configuration information for data transmission and reception for the small base station is received from an upper signal (system or RRC signal). . Thereafter, setting information for data transmission/reception for the macro base station 501 operating as an LTE/LTE-A system is received from an upper signal (system or RRC signal) of the small base station 503, 504, and 505, and the macro base station ( Random access to the 501) is performed, and data transmission/reception is possible from the small base stations 503, 504, and 505 and the macro base station 501. In this case, the small base stations 503, 504, and 505 operating in the NR system are referred to as MCG, and the macro base station 501 operating in the LTE system is referred to as SCG. It may be expressed that the UE is in the dual access state as set to the MCG using NR radio access and the SCG using E-UTRA radio access (or LTE/LTE-A). Alternatively, it may be expressed that the terminal is set to NE-DC (NR E-UTRA Dual Connectivity).

Hereinafter, embodiments described in the present invention will be proposed in consideration of the above-described first dual access configuration method and the second dual access configuration method. That is, in the present invention, another embodiment is proposed according to whether the LTE cells using E-UTRA are MCG or the NR cell using NR is MCG. When the terminal is in a dual access state, since it is necessary to give importance to uplink transmission to MCG rather than uplink transmission to SCG, different embodiments according to whether LTE cells using E-UTRA are MCG or NR cells using NR are MCG. Suggest. In addition, timing for transmitting uplink transmission to a cell using NR, such as PDCCH versus PUSCH transmission timing or PDCCH versus PUCCH transmission timing, can be indicated differently according to an upper signal configuration and an instruction from the PDCCH, and uplink transmission to a cell using LTE Since the timing for transmitting (eg, PDCCH versus PUSCH transmission timing or PDCCH versus PUCCH transmission timing) is fixed, embodiments of the present invention are proposed in consideration of these conditions.

<Method for the UE to perform uplink transmission according to whether the UE has dynamic power distribution capability in a situation where LTE TDD is a primary cell and NR is a secondary cell>

Whether the UE has dynamic power distribution capability when the UE is set to EN-DC (E-UTRA NR Dual Connectivity) where LTE TDD is a primary cell and NR is a secondary cell through the following description and FIGS. 6, 7, 8, 9, and 10 Accordingly, a method for the UE to perform uplink transmission will be described through various embodiments.

When the terminal is set to EN-DC, that is, when the terminal is set to MCG using E-UTRA radio access and SCG using NR radio access, the terminal is configured to uplink for LTE from an LTE base station or an NR base station. It is possible to receive settings for the maximum power value of and the maximum power value of the uplink for NR. In addition, the terminal receives a setting for a maximum power value for EN-DC operation from an LTE base station or an NR base station. At this time, if the sum of the maximum power value of the uplink for LTE and the maximum power value of the uplink for NR is greater than the maximum power value for EN-DC operation, the terminal may apply one of the following two power distribution methods. I can.

The first is semi-static power sharing between MCG (LTE) and SCG (NR).

When the terminal receives a reference TDD configuration that restricts LTE uplink transmission only in a specific subframe for uplink transmission of LTE, the terminal provides the ability to perform dynamic power sharing to the base station. If not indicated or reported, the UE does not expect uplink transmission in an NR slot coinciding with a time interval in which LTE is an uplink subframe by the reference TDD configuration (or configuration or scheduling indicating NR uplink transmission from an NR base station. Do not expect). By adding a HARQ offset in addition to the reference TDD configuration, all subframes configured to perform LTE uplink transmission can be moved by the HARQ offset. For example, if the subframe for performing LTE uplink transmission by reference TDD configuration is #2, if the HARQ offset set to the terminal is 1, the terminal is determined by #3, which is the subframe index #2 plus the HARQ offset 1 A subframe for performing LTE uplink transmission may be determined as subframe #3. The terminal may receive the HARQ offset through an upper signal. Thereafter, the HARQ offset can be applied to the reference TDD configuration described in the present invention in the same manner as described above, even if not specifically mentioned in the present invention.

The second is dynamic power sharing between MCG (LTE) and SCG (NR). When the terminal instructs or reports the ability to perform the dynamic power sharing to the base station, the LTE uplink transmission and the NR uplink transmission of the terminal collide, and the power of the LTE uplink transmission and the power of the NR uplink transmission When the sum is greater than the maximum power value for the EN-DC operation, the terminal may drop NR uplink transmission as a first scheme. As a second method, the terminal may reduce the NR uplink transmission power so that the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is less than a maximum power value for EN-DC operation. When reducing the NR uplink transmission power, when the transmission power to be reduced is greater than X, the terminal may drop NR transmission, and when the transmission power to be reduced is less than X, the terminal transmits NR uplink using the reduced transmission power. Perform.

For the first or second, the UE may report the capability of not supporting simultaneous uplink transmission to the base station as a higher signal. Alternatively, the capability of not supporting simultaneous uplink transmission for an LTE TDD cell or a carrier and a specific band combination including an NR cell or a carrier may be reported as a higher signal.

6 is a diagram showing a first problem situation to be solved by the present invention.

In FIG. 6, LTE 601 is MCG and is operated by TDD, and NR 602 is SCG. Therefore, it can be applied when the terminal is set to EN-DC. In FIG. 6, the TDD cell of the LTE 601 is TDD UL-DL configuration #6 (for example, TDD UL-DL configuration #6 describes the situation, but is not limited thereto), and the EN-DC terminal By receiving the TDD UL-DL configuration #6 from system information, it is possible to know the locations of the uplink subframe, the special subframe, and the downlink subframe. The EN-DC terminal may receive information on the position or number of uplink or downlink or flexible slots and OFDM symbols of the NR 602 from system information or higher information or a physical layer signal.

In FIG. 6, the first problem situation will be described in consideration of the situation in which the EN-DC terminal operates in quasi-static power distribution between the LTE 601 and the NR 602. That is, the EN-DC terminal receives the setting for #5 among reference TDD settings (#2, #4, #5) that can restrict LTE uplink transmission only in a specific subframe for uplink transmission of LTE, and the It is assumed that the EN-DC terminal does not indicate or report the capability of dynamic power distribution to the LTE or NR base station. At this time, the EN-DC terminal is the reference TDD configuration # of the uplink subframes #2, #3, #4, #7, #8 of the TDD UL-DL configuration #6 of the LTE 601 received as system information. LTE uplink transmission is possible only in uplink subframe #2 matching the uplink subframe by 5 (604, 607), and the NR corresponding to the time interval of the remaining uplink subframes #3, #4, #7, #8 In the slot, it can be seen that NR uplink transmission is possible (603, 605, 606, 608). (Refer to Table 3 and Table 4)

If the EN-DC terminal follows the UL HARQ timing relationship between PDCCH transmission and PUSCH transmission defined in TDD UL-DL configuration #6 given from system information of LTE 601 for uplink data transmission (Tables 6 and 7 Note), the EN-DC terminal performs PUSCH transmission in uplink subframe #2 by scheduling of the PDCCH received from the LTE base station in downlink subframe #5 of LTE 601 (611), and special subframe #6 Receives ACK/NACK or PDCCH for the PUSCH from the LTE base station (612), and a retransmission PUSCH for this is transmitted in uplink subframe #3 (613). Since the time interval corresponding to the uplink subframe #3 is an interval in which only NR uplink transmission is possible, when PUSCH retransmission of the EN-DC terminal as described above occurs, there is a problem that NR uplink transmission and LTE uplink transmission collide. Is done. Accordingly, the present invention provides a method for solving the above problems through the first and second embodiments.

Next, in FIG. 6, the second problem situation will be described in consideration of the situation in which the EN-DC terminal operates in dynamic power distribution between the LTE 601 and the NR 602. That is, when the EN-DC terminal instructs or reports the ability to perform the dynamic power distribution to the base station, the uplink subframe #2 is limited to perform uplink transmission of LTE by reference TDD configuration. When the LTE uplink transmission and the NR uplink transmission of the terminal collide as shown in 608 of FIG. 6, or the sum of the power of the LTE uplink transmission and the NR uplink transmission is greater than the maximum power value for the EN-DC operation In Example 3, the EN-DC terminal provides a method for solving the problem. In addition, in uplink subframes #3, #4, #7, and #8, which are time intervals other than the uplink subframe #2, which is limited to uplink transmission of LTE by the reference TDD configuration, the LTE uplink transmission and NR uplink transmission of the terminal As shown in 608 of FIG. 6, or when the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for the EN-DC operation, the EN-DC terminal A method for solving the above problem is provided.

[Example 1]

7 is a diagram illustrating uplink transmission according to Embodiment 1 of the present invention.

In FIG. 7, LTE 701 is an MCG and is operated by TDD, and NR 702 is an SCG. Therefore, it can be applied when the terminal is set to EN-DC. In FIG. 7, the TDD cell of the LTE 701 is TDD UL-DL configuration #1, and the EN-DC terminal receives the TDD UL-DL configuration #1 from system information and receives an uplink subframe, a special subframe, and a downlink sub. You can know the location of the frame. Information on the position or number of the uplink or downlink or the flexible slot of the NR 702 and the number of OFDM symbols may be received by the EN-DC terminal from system information or higher information or a physical layer signal. In FIG. 7, consider a situation in which the EN-DC terminal operates in quasi-static power distribution between the LTE 701 and the NR 702. That is, the EN-DC terminal receives the setting for #2 during reference TDD configuration (#2, #4, #5) that can limit LTE uplink transmission only in a specific subframe for uplink transmission of LTE, and the EN -It is assumed that the DC terminal does not indicate or report the ability to perform dynamic power distribution to the LTE or NR base station. In this case, the EN-DC terminal is the uplink subframe #2, #3, #7, #8 of the TDD UL-DL configuration #1 of the LTE 701 received as system information by the reference TDD configuration #2. It can be seen that LTE uplink transmission is possible only in uplink subframes #2 and #7 that coincide with the uplink subframe, and NR uplink transmission is possible in the NR slots that match the time intervals of the remaining uplink subframes #3 and #8. . (Refer to Table 3 and Table 4)

As described above, the TDD UL-DL configuration received from the LTE base station of the LTE 701 is one of #1, #2, #3, #4, #5 excluding #0 and #6, and the upper signal is the LTE base station or If the reference TDD configuration received from the NR base station is one of #2, #4, and #5, the EN-DC terminal configures the TDD UL-DL given from the system information of the LTE 701 for uplink data transmission, and TDD in FIG. If the UL HARQ timing relationship between PDCCH transmission and PUSCH transmission defined in UL-DL configuration #1 is followed (refer to Tables 6 and 7), the EN-DC terminal receives PDCCH and uplink subframes according to PUSCH transmission and PUSCH retransmission. Because they occur in the same LTE uplink subframe for every radio frame (711, 712, 713, 714), when PUSCH retransmission of the EN-DC terminal as described above occurs, NR uplink transmission and LTE uplink transmission collide. Does not occur.

[Example 2]

8 is a diagram illustrating uplink transmission according to Embodiment 2 of the present invention.

In FIG. 8, LTE 801 is MCG and is operated by TDD, and NR 802 is SCG. Therefore, it can be applied when the terminal is set to EN-DC. In FIG. 8, the TDD cell of the LTE 801 is TDD UL-DL configuration #6, and the EN-DC terminal receives the TDD UL-DL configuration #6 from system information and receives an uplink subframe, a special subframe, and a downlink sub. You can know the location of the frame. The EN-DC terminal may receive information on the position or number of uplink or downlink or flexible slots and OFDM symbols of the NR 802 from system information or higher information or a physical layer signal. In FIG. 8, consider a situation in which an EN-DC terminal is operating in quasi-static power distribution between the LTE 801 and the NR 802. That is, the EN-DC terminal receives the setting for #4 during reference TDD configuration (#2, #4, #5) that can limit LTE uplink transmission only in a specific subframe for uplink transmission of LTE, and the EN -It is assumed that the DC terminal does not indicate or report the ability to perform dynamic power distribution to the LTE or NR base station. At this time, the EN-DC terminal is the reference TDD configuration # of the uplink subframes #2, #3, #4, #7, #8 of TDD UL-DL configuration #6 of LTE 801 received as system information. LTE uplink transmission is possible only in uplink subframes #2 and #3 that match the uplink subframe by 4, and NR uplink transmission in the NR slots that match the time intervals of the remaining uplink subframes #4, #7, #8 You can see that this is possible. (Refer to Table 3 and Table 4)

As described above, the TDD UL-DL configuration received from the LTE base station of the LTE 801 is one of #0 and #6, and the reference TDD configuration received from the LTE base station or the NR base station as an upper signal is #2, #4, # If it is one of 5, the EN-DC terminal transmits PDCCH and PUSCH defined according to another specific second reference TDD configuration rather than a TDD UL-DL configuration given from system information of LTE 801 for uplink data transmission. It is proposed to follow the UL HARQ timing relationship (refer to Table 6 and Table 7). In this case, since the EN-DC terminal generates uplink subframes according to PDCCH reception, PUSCH transmission, and PUSCH retransmission in the same LTE uplink subframe for every radio frame (811, 812, 813, 814), the EN -When PUSCH retransmission of the DC terminal occurs, the problem of collision between NR uplink transmission and LTE uplink transmission does not occur.

The second reference TDD configuration for defining the UL HARQ timing relationship can be proposed as follows.

If the UL-DL configuration from system information is #6 and the reference TDD configuration is one of #2, #4, and #5, the second reference TDD configuration for UL HARQ timing is #1.

If the UL-DL configuration from system information is #0 and the reference TDD configuration is one of #2 and #5, the second reference TDD configuration for UL HARQ timing is #1.

When the UL-DL configuration from system information is #0 and the reference TDD configuration is #4, when the second reference TDD configuration #1 for UL HARQ timing is followed, the PDCCH scheduling the PUSCH of the uplink subframe #3 is It should be transmitted in downlink subframe #9 of the previous radio frame. However, in the UL-DL configuration #0, since subframe #9 is uplink, a problem occurs in that the PDCCH cannot be transmitted.

Therefore, when the UL-DL configuration from system information is #0 and the reference TDD configuration is #4, the following proposal is possible.

First, the second reference TDD configuration for UL HARQ timing is #1, but the EN-DC terminal does not expect PUSCH scheduling in UL subframe #3 of LTE.

Second, the second reference TDD configuration for UL HARQ timing in UL subframe #2 is #1, but the PDCCH scheduling PUSCH in UL subframe #3 in the EN-DC terminal is a downlink sub of the previous radio frame. Expect to be transmitted in frame #5.

Third, when the UL-DL configuration from system information is #0, the EN-DC terminal does not expect the reference TDD configuration #4. That is, the terminal expects only when the reference TDD configuration is set to #2 or #5.

Unlike the above proposals, it is also possible that the EN-DC terminal does not expect that the UL-DL configuration from system information is #0 or #6 from the beginning. That is, the EN-DC terminal does not expect the same configuration as in the case of Embodiment 2 above, and only receives one TDD UL-DL configuration number of #1, #2, #3, #4, #5 from system information. In addition, the reference TDD configuration receives one of #2, #4, and #5 from an upper signal, and the second reference TDD configuration for UL HARQ timing is #1, which may be defined in the standard.

[Example 3]

6, in consideration of the situation in which the EN-DC terminal operates in dynamic power distribution between the LTE 601 and the NR 602, the EN-DC terminal instructs the base station of the ability to perform the dynamic power distribution or In the case of reporting, the LTE uplink transmission and the NR uplink transmission of the terminal collide as in 608 of FIG. 6 in the time interval of uplink subframe #2, which is restricted to perform uplink transmission of LTE by the reference TDD configuration, or the LTE In the case where the sum of the power of uplink transmission and the power of NR uplink transmission is greater than the maximum power value for the EN-DC operation, the EN-DC terminal provides a method for solving the problem through the third embodiment.

The first method is that the EN-DC terminal performs only LTE uplink transmission and always drops NR uplink transmission. As described above, it is possible to protect the uplink transmission of LTE serving as an MCG, and thus, it is possible to maintain a connection with the MCG and transmit and receive important information necessary for an RRC connection from the MCG.

The second method is that the EN-DC terminal maintains the power of the LTE uplink transmission, and transmits the NR uplink so that the sum of the power of the LTE uplink transmission and the NR uplink transmission is equal to or less than the set maximum power value for the EN-DC operation. Is to reduce the power of By protecting the uplink transmission of the LTE acting as an MCG in the above-described way, it maintains the connection with the MCG, transmits and receives important information necessary for the RRC connection from the MCG, and performs NR uplink transmission within the maximum EN-DC power. It is possible.

[Example 4]

6, in consideration of the situation in which the EN-DC terminal operates in dynamic power distribution between the LTE 601 and the NR 602, the EN-DC terminal instructs the base station of the ability to perform the dynamic power distribution or In the case of reporting, LTE uplink transmission and NR of the terminal in uplink subframes #3, #4, #7, and #8 which are time intervals other than uplink subframe #2, which is limited to uplink transmission of LTE by reference TDD configuration. In the case where the uplink transmission collides as in 608 of FIG. 6 or the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for the EN-DC operation, the EN- The DC terminal provides a method for solving the above problem.

The first method is that the EN-DC terminal performs only LTE uplink transmission and always drops NR uplink transmission. As described above, it is possible to protect the uplink transmission of LTE serving as an MCG even in an uplink subframe corresponding to a time period other than the uplink subframe #2, which is limited to uplink transmission of LTE by the reference TDD setting, It is possible to maintain a connection with and transmit and receive important information necessary for RRC connection from the MCG.

The second method is that the EN-DC terminal maintains the power of the LTE uplink transmission, and transmits the NR uplink so that the sum of the power of the LTE uplink transmission and the NR uplink transmission is equal to or less than the set maximum power value for the EN-DC operation. Is to reduce the power of With the above method, the uplink transmission of LTE serving as MCG is protected even in an uplink subframe corresponding to a time interval other than the uplink subframe #2, which is restricted to perform uplink transmission of LTE by the reference TDD setting in the same manner as above. , It is possible to maintain the connection with the MCG, transmit and receive important information necessary for the RRC connection from the MCG, and simultaneously perform NR uplink transmission within the EN-DC maximum power, thereby increasing the transmission and reception data throughput of the terminal.

The third method is that the EN-DC terminal performs only NR uplink transmission and always drops LTE uplink transmission. In the above scheme, in the uplink subframe corresponding to a time interval other than the uplink subframe #2, which is limited to uplink transmission of LTE by the reference TDD configuration, the uplink of NR serving as SCG rather than uplink transmission of LTE serving as MCG By enabling the transmission, it is possible to increase the amount of data transmission and reception using NR, and thus, it is possible to increase the throughput of the uplink and downlink data of the EN-DC terminal.

As another method, it is possible to mix the above three methods and apply them to the EN-DC terminal. For example, it is possible to apply the first method to a specific LTE uplink channel transmission or a specific LTE uplink transmission signal, such as when the LTE uplink transmission is an important uplink transmission for RRC connection such as PRACH (physical random access channel) transmission. If it does not correspond to LTE uplink channel transmission or a specific LTE uplink transmission signal, it is possible to apply the second or third method. Alternatively, the third method is applied to a specific NR uplink channel transmission or a specific NR uplink transmission signal, such as when the NR uplink transmission is an important uplink transmission such as PRACH transmission, and does not correspond to the specific NR uplink channel transmission or a specific NR uplink transmission signal. If not, it is possible to apply the first or second option.

Next, FIG. 9A is a diagram illustrating an operation procedure of a base station according to embodiments proposed in the present invention.

Referring to FIG. 9A, in step 911, the base station transmits configuration information of each cell to the terminal to the terminal through system information or an upper signal. The configuration information may be cell-related information of MCG or SCG cells required for dual access (at least one of TDD or FDD information, uplink carrier frequency, uplink frequency band, uplink subcarrier spacing, etc.), and data transmission/reception in the MCG or SCG It may be the setting information required for Alternatively, the setting information may include at least one of setting information related to various parameters described in the embodiments of the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

In step 912, the base station configures uplink transmission to the terminal according to embodiments proposed in the present invention and transmits scheduling information indicating uplink transmission. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration may mean uplink transmission in which transmission is configured by higher signal configuration without being indicated by the PDCCH, such as periodic channel information transmission, and the uplink transmission indicated by the scheduling information is PUSCH transmission or HARQ-ACK. Like transmission, it may mean uplink transmission indicated by the PDCCH and transmitted from the terminal. Alternatively, it may be uplink transmission from the terminal such as PRACH or SRS.

In step 913, the base station receives an uplink transmission from the terminal according to the embodiments proposed in the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

9B is a diagram illustrating a terminal operation procedure according to embodiments proposed in the present invention.

Referring to FIG. 9B, in step 921, the UE receives configuration information of each cell from the base station through system information or an upper signal. The configuration information may be cell-related information of MCG or SCG cells required for dual access (at least one of TDD or FDD information, uplink carrier frequency, uplink frequency band, uplink subcarrier spacing, etc.), or data from the MCG or SCG It may be configuration information necessary for transmission and reception. Alternatively, the setting information may include at least one of setting information related to various parameters described in the embodiments of the present invention. As described in the embodiments of the present invention, before receiving the dynamic power distribution capability from the base station as an upper signal, the terminal may transmit the capability-related information to the base station to the base station. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

In step 922, the terminal receives uplink transmission configuration information from the base station according to the embodiments proposed in the present invention, and receives scheduling information indicating uplink transmission. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration information may mean configuration information related to uplink transmission that is not indicated by a PDCCH, such as periodic channel information transmission, but transmission is configured by higher signal configuration, and the uplink transmission indicated by the scheduling information is PUSCH It may mean uplink transmission indicated by the PDCCH and transmitted from the terminal, such as transmission or HARQ-ACK transmission. Alternatively, it may be uplink transmission transmitted from a terminal such as PRACH or SRS.

In step 923, the UE controls the transmission timing and transmission power using the UL HARQ timing relationship (PDCCH-to-PUSCH transmission, PUSCH-to-PDCCH transmission, etc.) according to the embodiments proposed in the present invention to perform uplink transmission. Send to Controlling the transmission power may include an operation of dropping uplink transmission or reducing uplink transmission power as described in the embodiments of the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

10 is a diagram showing a second problem situation to be solved by the present invention. It is assumed that the EN-DC terminal transmits and receives data with the base stations described in FIG. 5 through the cell having the configuration of FIG. 10.

In FIG. 10, LTE is an MCG, and is set to the EN-DC terminal through carrier aggregation (CA, Carrier Aggregation) through two cells, and NR is an SCG, and is set to the EN-DC terminal as one cell 1002. Assume the situation. As the first LTE cell of the MCG, Pcell (Primary cell) 1001 is a TDD cell with TDD UL-DL configuration #0, and as the second LTE cell of MCG, the Scell (Secondary cell) 1003 is operated as an FDD cell. Assuming the present invention will be described. In FIG. 10, although the Scell 1003 is an FDD cell, it may be operated as a TDD cell, particularly a TDD UL-DL configuration #0, such as the Pcell 1001, or may be operated in a different TDD UL-DL configuration. have. That is, the TDD configuration or the FDD configuration of the SCell 1003 is not limited to the configuration illustrated in FIG. 10, and may be equally applied to other configurations.

In FIG. 10, the EN-DC terminal receives the TDD UL-DL configuration #0 of the Pcell 1001 from system information to know the locations of uplink subframes, special subframes, and downlink subframes, and the Scell( The carrier information and bandwidth information of 1003) can be obtained by receiving from an upper signal. The EN-DC terminal may receive information on the position or number of uplink or downlink or flexible slots and OFDM symbols of the NR cell 1002 from system information or higher information or a physical layer signal. In FIG. 10, consider a situation in which an EN-DC terminal operates with quasi-static power distribution between LTE and NR. That is, the EN-DC terminal receives the configuration for #2 as an upper signal among the reference TDD settings (#2, #4, #5) that can limit LTE uplink transmission only in a specific subframe for uplink transmission of LTE. Or, it is assumed that the EN-DC terminal does not indicate or report the capability of dynamic power distribution to the LTE or NR base station. At this time, the EN-DC terminal is the uplink subframe #2, #3, #4, #7, #8, #9 of the TDD UL-DL configuration #0 of the LTE Pcell (1001) received as system information. LTE uplink transmission is possible only in uplink subframes #2 and #7 that match the uplink subframe by reference TDD configuration #2, and the time intervals of the remaining uplink subframes #3, #4, #8, and #9 It can be seen that NR uplink transmission is possible in the NR slot. Accordingly, HARQ ACK/NACK for downlink data transmitted from the LTE Pcell 1001 is transmitted from the timing relationship in the UL-DL configuration #2 of Tables 3 and 4 corresponding to the reference TDD configuration value #2. . That is, when downlink data is received in subframes #4, #5, #8, #6 of the LTE Pcell 1001, the EN-DC terminal transmits HARQ ACK/NACK feedback for the downlink data to the LTE Pcell 1001 If transmitted in subframe #2 of (1011) and downlink data is received in subframes #9, #0, #3, and #1, the EN-DC terminal transmits HARQ ACK/NACK feedback for the downlink data in LTE It is transmitted in subframe #7 of the Pcell 1001 (1012).

Since the HARQ ACK/NACK for downlink data reception of the LTE Scell 1003 is also transmitted from the Pcell 1001, which is the primary cell, the HARQ-ACK/NACK can also be transmitted only in a specific LTE subframe of the Pcell 1001. . That is, LTE uplink transmission is possible only in uplink subframes #2 and #7 that match the uplink subframe by the reference TDD configuration #2, and the remaining uplink subframes #3, #4, #8, and #9 time intervals It can be seen that only NR uplink transmission is possible in the slot of the NR corresponding to.

Therefore, HARQ ACK/NACK for downlink data transmitted from the LTE Scell 1003 is transmitted from the timing relationship in the DL reference UL-DL configuration #2 of Table 8 corresponding to the reference TDD configuration value #2. That is, when downlink data is received in subframes #4, #5, #6, #7, and #8 of the LTE Scell 1003, the EN-DC terminal transmits HARQ ACK/NACK feedback for the downlink data to the Pcell ( When transmitting in subframe #2 of 1001) (1013), and receiving downlink data in subframes #9, #0, #1, #2, #3 of LTE Scell (1003), the EN-DC terminal HARQ ACK/NACK feedback for downlink data is transmitted in subframe #7 of Pcell 1001 (1014).

[Table 8] shows that similar to [Table 3], when the UE receives the PDSCH transmitted in subframe nk of the FDD Scell from the base station, uplink HARQ ACK/NACK for the PDSCH in uplink subframe n of the TDD Pcell Transfer. In this case, k is a member of the set K, and K is as defined in [Table 8].

[Table 8]

At this time, when transmitting HARQ ACK/NACK feedback in subframe #2 of Pcell 1001, the EN-DC terminal transmits HARQ ACK/NACK feedback using PUCCH format 3 or 4 or 5 defined in the LTE standard. do. Among the PUCCH formats, which PUCCH format is used to transmit HARQ ACK/NACK feedback may be set in advance to the EN-DC terminal using an upper signal from the base station. The higher signal may include information on a PUCCH format that the EN-DC terminal should use when transmitting HARQ-ACK feedback and a plurality of resources for transmitting the PUCCH format.

A method for the EN-DC terminal to select one resource from a plurality of resources for transmitting the PUCCH format is as follows. An EN-DC terminal that has received a plurality of PDCCH/EPDCCHs through a plurality of subframes of an LTE Pcell 1001 or LTE Scell 1003 has a “Downlink Assignment Index (DAI)” field greater than 1 from the PDCCH/EPDCCH. Or, when the “DAI” field is 1 but the PDCCH/EPDCCH with the “DAI” field of 1 is not the first PDCCH/EPDCCH in K (Table 3 or Table 8), the “TPC (Transmit Power Control) of the PDCCH/EPDCCH” The 2-bit value of the “Command” field can indicate one resource from four resources. The terminal receiving one resource from the “TPC Command” field transmits HARQ ACK/NACK feedback in the PUCCH format configured using the resource. At this time, if the “DAI” field is 1 or the PDCCH/EPDCCH in which the “DAI” field is 1 is the first PDCCH/EPDCCH in K (Table 3 or Table 8), the “TPC (Transmit Power) of the PDCCH/EPDCCH Control) The 2-bit value of the “Command” field may indicate a power adjustment value when transmitting the set PUCCH format. From the “TPC Command” field, the EN-DC terminal adjusts and transmits the power of the PUCCH format.

In this case, when the EN-DC terminal receives only the PDSCH through one first PDCCH/EPDCCH in the LTE Pcell 1001 or only one PDCCH/EPDCCH for DL SPS release (1011 or 1012) or the corresponding When receiving only one PDSCH without PDCCH, or the base station transmits a PDCCH/EPDCCH scheduling a plurality of PDSCHs in a plurality of subframes, the EN-DC terminal through a first PDCCH/EPDCCH due to a reception error In the case of receiving only the PDSCH, the “TPC command” field in the received PDCCH/EPDCCH is a field for power adjustment when transmitting the PUCCH format, and indicates which resource to transmit the PUCCH format using from the plurality of set PUCCH transmission resources. There is a problem that the EN-DC terminal cannot know. Accordingly, the present invention provides a method for determining a PUCCH transmission resource of a PUCCH format 3/4/5 in the above situation.

In the first scheme, in the above-described situation, the base station may separately set the PUCCH transmission resource of the PUCCH format 3/4/5 to the EN-DC terminal through an upper signal. In addition to a plurality of resources (resource mapped to the TPC command field) for transmitting the above-described PUCCH format, additional PUCCH resources may be configured to be used in the above problem situation. The EN-DC terminal receives the resource through an upper signal, and transmits a PUCCH format including HARQ-ACK feedback through a resource set as the higher signal in the above problem situation.

In the second scheme, in the above-described situation, the base station may indicate to the EN-DC terminal a PUCCH transmission resource of PUCCH format 3/4/5 in the “TPC command” field in the first PDCCH/EPDCCH. Accordingly, the “TPC command” field is also used for power control when the EN-DC terminal transmits the PUCCH format, and is also used for resource determination for the PUCCH format transmission. That is, the EN-DC terminal transmits the PUCCH format by adjusting power according to the value of the “TPC command” field in the resource indicated according to the value of the “TPC command” field in the first PDCCH/EPDCCH.

In the third scheme, in the above-described situation, the EN-DC terminal transmits the PUCCH format by default using one resource among a plurality of resources (resource mapped to the TPC command field) for transmitting the PUCCH format described above. That is, among the plurality of resources, a resource to be used in the above problem situation is defined in the standard, and the EN-DC terminal transmits a PUCCH format including HARQ-ACK feedback in the predefined resource.

In the fourth scheme, the EN-DC terminal transmits including HARQ ACK/NACK feedback in PUCCH format 1a/1b instead of using PUCCH format 3/4/5 in the above problem situation, and in this case, PUCCH format 1a/1b The transmission resource of may be implicitly mapped to the transmission resource of the PDCCH/EPDCCH received in the above problem situation. In order to prevent PUCCH transmission resource collision with an existing LTE terminal, the base station may transmit an offset value to be added to the PUCCH transmission resource through an upper signal to the EN-DC terminal. The EN-DC terminal may determine the transmission resource based on the implicit mapped PUCCH transmission resource and the offset value. For example, the EN-DC terminal receiving the offset value determines the transmission resource of the PUCCH format 1a/1b by adding the offset value to the PUCCH transmission resource implicitly mapped to the transmission resource of the received PDCCH/EPDCCH. And, PUCCH format 1a/1b is transmitted in the determined transmission resource.

<A method for avoiding interference effects on LTE downlink reception or NR downlink reception caused by LTE uplink or NR uplink transmission in a situation where LTE FDD is a primary cell and NR is a secondary cell>

In the following description and through FIGS. 11 and 12, when the UE is set to EN-DC where LTE FDD is a primary cell and NR is a secondary cell, interference effect on LTE downlink reception or NR downlink reception caused by LTE uplink or NR uplink transmission A method for avoiding will be described through various embodiments.

11 is a diagram showing a first interference situation to be solved by the present invention. First, it will be described to avoid the effect of IM interference through FIG. 11. When simultaneous uplink transmission occurs in an uplink carrier of an LTE cell and an uplink carrier of an NR cell in a specific band combination (e.g., LTE band 3, NR band 77), the inter-modulation product from the simultaneous uplink transmission is It may cause interference in downlink reception in a downlink carrier of an LTE cell, and thus, may cause performance degradation for downlink reception. Such interference is referred to as IM interference. The above band combination may be configured by a base station (eNB or gNB) as an upper signal by the terminal.

In FIG. 11, LTE (1101 or 1103) is MCG and is operated by FDD, and NR (1102 or 1104) is SCG. Therefore, it can be applied when the terminal is set to EN-DC. In FIG. 11, the LTE 1101 or 1103 is an FDD cell, and the EN-DC terminal can know by receiving DL carrier and UL carrier information of the FDD cell from system information. The EN-DC terminal may receive information on the position or number of uplink or downlink or flexible slots and OFDM symbols of the NR 1102 or 1104 from system information or higher information or a physical layer signal.

In FIG. 11, the EN-DC terminal may receive downlink data from a base station (eNB or gNB) in an LTE or NR cell. If the EN-DC terminal receives downlink data through the LTE cell in subframe #9, the EN-DC terminal subframes feedback on the downlink data according to PDSCH to PUCCH HARQ timing defined for LTE FDD. It is transmitted on the uplink carrier of the LTE cell of #3. In this case, when the EN-DC terminal receives scheduling for uplink transmission in slot #3 of the NR cell coinciding with subframe #3 from the gNB, the EN-DC terminal performs inter-modulation of the two uplinks. As a result, the LTE downlink reception is affected by IM interference. A possible way to avoid the above IM interference is to avoid downlink scheduling that causes the above uplink transmission by implementing the base station. For example, even if the gNB schedules NR uplink transmission in slot #3, the eNB avoids scheduling downlink data in subframe #9 so that the EN-DC terminal does not perform LTE uplink transmission in subframe #3. have. The above-described scheme prevents the EN-DC terminal from performing two uplink transmissions at the same time, thereby avoiding an interference effect on LTE downlink reception of the EN-DC terminal. However, the above scheme may cause downlink performance degradation because downlink scheduling should be avoided.

The method for avoiding IM interference while preventing downlink performance degradation as described above is to limit LTE uplink transmission to a specific subframe in which NR uplink transmission does not occur, and to cause uplink transmission in the specific subframe. This is to define the to-PUCCH HARQ timing. The lower part of FIG. 11 shows an example of applying HARQ timing in [Table 8]. That is, by making the EN-DC terminal use the timing defined for UL/DL configuration #2 (or reference TDD setting) as PDSCH-to-PUCCH HARQ timing (1113, 1114), uplink transmission of LTE is performed. Performed only in subframe #2 or #7 (1115, 1117, 1119), and uplink transmission of NR is performed only in the remaining slots (1116, 1118, 1120) that do not temporally match with subframe #2 or #7. You can do it.

When the terminal is set to EN-DC, that is, when the terminal is set to MCG using E-UTRA radio access and SCG using NR radio access, the terminal is configured to uplink for LTE from an LTE base station or an NR base station. It is possible to receive settings for the maximum power value of and the maximum power value of the uplink for NR. In addition, the terminal receives a setting for a maximum power value for EN-DC operation from an LTE base station or an NR base station. In this case, when the sum of the maximum power value of the uplink for LTE and the maximum power value of the uplink for NR is greater than the maximum power value for EN-DC operation, the terminal performs one of quasi-static power distribution and dynamic power distribution. Can be applied. In this case, the UE may report the capability of not supporting simultaneous uplink transmission to the base station as a higher signal. Alternatively, the capability of not supporting simultaneous uplink transmission for an LTE TDD cell or a carrier and a specific band combination including an NR cell or a carrier may be reported as a higher signal.

When describing the quasi-static power distribution between MCG (LTE) and SCG (NR), when a terminal receives a reference TDD configuration that limits LTE uplink transmission only in a specific subframe for LTE uplink transmission , If the terminal does not indicate or report the ability to perform dynamic power distribution to the base station, the terminal expects NR uplink transmission in the NR slot coinciding with the time interval in which the LTE is an uplink subframe by the reference TDD setting. Do not (or do not expect configuration or scheduling indicating NR uplink transmission from the NR base station). With the above setting, it is possible for the terminal to avoid IM interference.

Next, the dynamic power distribution between the MCG (LTE) and the SCG (NR) will be described. When the terminal instructs or reports the ability to perform the dynamic power distribution to the base station, the dynamic power distribution capability for uplink transmission A UE having an LTE and NR uplink transmission is not limited to a specific subframe or slot, whereas when the LTE and NR uplink transmissions collide in time, there is a need for a scheme for which uplink transmission to be prioritized. When the LTE uplink transmission and the NR uplink transmission of the terminal collide, and the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for the EN-DC operation, or to avoid the influence of IM interference, the terminal May drop NR uplink transmission. As a second method, the terminal may reduce the NR uplink transmission power so that the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is less than a maximum power value for EN-DC operation. Alternatively, when reducing the NR uplink transmission power, if the transmission power to be reduced is greater than X, the terminal may drop the NR transmission, and when the transmission power to be reduced is less than X, the terminal may increase the NR by using the reduced transmission power. You can also perform transmission.

Next, FIG. 12 is a diagram showing a second interference situation to be solved by the present invention. First, a description will be made of avoiding the influence of harmonic interference through FIG. 12. When uplink transmission occurs in an uplink carrier of an LTE cell in a specific band combination (for example, LTE band 3, NR band 77, or NR band 78), the harmonic caused by the uplink transmission interferes with downlink reception in the NR cell. Can cause, and thus, performance degradation for downlink reception. Such interference is referred to as harmonic interference. The above band combination may be configured by a base station (eNB or gNB) as an upper signal by the terminal.

In FIG. 12, the LTE 1201 or 1203 is an MCG and is operated by FDD, and the NR 1202 or 1204 is an SCG. Therefore, it can be applied when the terminal is set to EN-DC. In FIG. 12, the LTE 1201 or 1203 is an FDD cell, and the EN-DC terminal can know by receiving DL carrier and UL carrier information of the FDD cell from system information. The EN-DC terminal may receive information on the position or number of uplink or downlink or flexible slots of the NR 1202 or 1204 and the number of OFDM symbols and from system information or higher information or a physical layer signal.

In FIG. 12, the EN-DC terminal may receive downlink data from a base station (eNB or gNB) in an LTE or NR cell. If the EN-DC terminal receives downlink data through the LTE cell in subframe #0, the EN-DC terminal subframes feedback on the downlink data by the PDSCH to PUCCH HARQ timing defined for LTE FDD. It is transmitted on the uplink carrier of the LTE cell of #4. At this time, when the EN-DC terminal receives downlink data from the gNB in slot #4 of the NR cell that temporally coincides with subframe #4, the EN-DC terminal downlinks the NR due to the harmonic of the uplink transmission. Link reception is affected by interference. A possible method for avoiding the harmonic interference is to avoid downlink scheduling that causes the uplink transmission by implementing the base station. For example, even if the gNB transmits NR downlink data in slot #4, the eNB avoids scheduling downlink data in subframe #0 so that the EN-DC terminal does not perform LTE uplink transmission in subframe #4. have. By preventing the EN-DC terminal from performing LTE uplink transmission in a slot in which NR downlink data is received through the above scheme, interference effects on NR downlink reception of the EN-DC terminal can be avoided. However, the above scheme may cause downlink performance degradation because LTE downlink scheduling should be avoided.

A method for preventing the downlink performance degradation and avoiding harmonic interference as described above is to limit the LTE uplink transmission to a specific subframe in which NR uplink transmission occurs, and to cause uplink transmission in the specific subframe. -This is to define the PUCCH HARQ timing. The lower part of FIG. 12 shows an example of applying HARQ timing in [Table 8]. That is, by making the EN-DC terminal use the timing defined for UL/DL configuration #2 (or reference TDD setting) as PDSCH-to-PUCCH HARQ timing (1213, 1214), uplink transmission of LTE is performed. It can be performed only in subframe #2 or #7 in which uplink slots in which NR uplink transmission occurs (1215, 1216, 1217). Accordingly, harmonic interference for NR downlink reception can be avoided. Uplink transmission of NR may be performed in other slots other than uplink slots #2 and #7.

When the terminal is set to EN-DC, that is, when the terminal is set to MCG using E-UTRA radio access and SCG using NR radio access, the terminal is configured to uplink for LTE from an LTE base station or an NR base station. It is possible to receive settings for the maximum power value of and the maximum power value of the uplink for NR. In addition, the terminal receives a setting for a maximum power value for EN-DC operation from an LTE base station or an NR base station. In this case, when the sum of the maximum power value of the uplink for LTE and the maximum power value of the uplink for NR is greater than the maximum power value for EN-DC operation, the terminal performs one of quasi-static power distribution and dynamic power distribution. Can be applied. In this case, the UE may report the capability of not supporting simultaneous uplink transmission to the base station as a higher signal. Alternatively, the capability of not supporting simultaneous uplink transmission for an LTE TDD cell or a carrier and a specific band combination including an NR cell or a carrier may be reported as a higher signal.

When describing the quasi-static power distribution between MCG (LTE) and SCG (NR), when a terminal receives a reference TDD configuration that limits LTE uplink transmission only in a specific subframe for LTE uplink transmission , If the terminal does not indicate or report the ability to perform dynamic power distribution to the base station, the terminal expects uplink transmission of LTE only in an uplink subframe of LTE configured to perform LTE uplink transmission by the reference TDD configuration. (Or, in an uplink subframe other than the uplink subframe from the LTE base station, configuration or scheduling indicating LTE uplink transmission is not expected). By the above setting, it is possible for the terminal to avoid harmonic interference.

Next, the dynamic power distribution between the MCG (LTE) and the SCG (NR) will be described. When the terminal instructs or reports the ability to perform the dynamic power distribution to the base station, the dynamic power distribution capability for uplink transmission The UE having LTE and NR uplink transmission is not limited to a specific subframe or slot, whereas NR slots other than the NR slot coincident with the uplink subframe of LTE set to perform LTE uplink transmission by the reference TDD configuration are uplink slots. In the case where NR uplink transmission is scheduled and LTE uplink transmission is scheduled outside of the above LTE uplink subframe, and there is a temporal collision between LTE uplink transmission and NR downlink reception, there is a need for a method of what operation the terminal should prioritize. . When the LTE uplink transmission and the NR uplink transmission of the terminal collide, and the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is greater than the maximum power value for the EN-DC operation or to avoid the effect of harmonic interference ( When the NR slot is a downlink slot) The terminal may always drop LTE uplink transmission. As a second method, the terminal may reduce the NR uplink transmission power so that the sum of the power of the LTE uplink transmission and the power of the NR uplink transmission is less than a maximum power value for EN-DC operation. Alternatively, when reducing the NR uplink transmission power, if the transmission power to be reduced is greater than X, the terminal may drop the NR transmission, and when the transmission power to be reduced is less than X, the terminal may increase the NR by using the reduced transmission power. You can also perform transmission. In the second scheme, the UE performs LTE uplink transmission using the LTE uplink transmission power since it is configured above, and when the NR slot is a downlink slot, it may attempt to receive the NR downlink despite the influence of harmonic interference.

Next, when the EN-DC terminal is affected by LTE or NR downlink reception due to the above-described IM interference and harmonic interference for a specific band combination, a method for the operation of the EN-DC terminal will be described.

For example, when uplink transmission occurs in an uplink carrier of an LTE cell in a specific band combination (e.g., LTE band 3, NR band 77), the harmonic caused by the uplink transmission may cause harmonic interference in downlink reception in the NR cell. And, thus, may cause performance degradation for downlink reception. At the same time, when simultaneous uplink transmission occurs in the uplink carrier of the LTE cell and the uplink carrier of the NR cell in the band combination, the inter-modulation product from the simultaneous uplink transmission is in the downlink carrier of the LTE cell. It may cause interference in downlink reception, and thus may cause performance degradation for downlink reception. In this case, in order to solve the above interference problem, the EN-DC terminal may perform the following operations.

As a first scheme, when the UE does not indicate a capability that does not support simultaneous uplink transmission as an upper signal (ie, does not indicate a singleUL-Transmission capability or indicates a capability that supports simultaneous uplink transmission), the UE As shown in 1215, 1216, and 1217 of FIG. 12, consider a situation in which an uplink subframe of an LTE cell and an uplink slot of an NR cell are temporally matched. Alternatively, the UE considers a situation in which the uplink subframe of the LTE cell and the uplink slot of the NR cell are temporally matched, and simultaneous uplink transmission in the LTE cell and the NR cell is indicated or configured from the base station. Under the above conditions and conditions, only LTE uplink transmission in LTE subframe #2 or LTE subframe #7 is performed, and NR uplink transmission or NR downlink reception in NR slot #2 or NR slot #7 is not expected. Alternatively, when NR uplink transmission is configured or indicated in the NR slots, the NR uplink transmission is dropped. Alternatively, when NR downlink reception is set or indicated in the NR slots, the NR downlink reception may not be decoded or decoding may be attempted in consideration of harmonic interference. The NR uplink transmission or NR downlink reception may be set or indicated in NR slots other than 1215, 1216, and 1217.

As a second method, when the UE indicates a capability that does not support simultaneous uplink transmission as a higher signal, the UE temporally provides an uplink subframe of an LTE cell and an uplink slot of an NR cell as shown in 1215, 1216, and 1217 of FIG. Consider matching situations. Alternatively, the UE considers a situation in which the uplink subframe of the LTE cell and the uplink slot of the NR cell are temporally matched, and simultaneous uplink transmission in the LTE cell and the NR cell is indicated or configured from the base station. Under the above conditions and conditions, the terminal does not expect LTE downlink reception in LTE subframe #2 or LTE subframe #7, or does not decode LTE downlink reception.

As a third scheme, regardless of which capability the UE indicates, the UE considers a situation in which an uplink subframe of an LTE cell and an uplink slot of an NR cell are temporally matched as shown in 1215, 1216, and 1217 of FIG. 12. Alternatively, the UE considers a situation in which the uplink subframe of the LTE cell and the uplink slot of the NR cell are temporally matched, and simultaneous uplink transmission in the LTE cell and the NR cell is indicated or configured from the base station. Under the above conditions and conditions, the terminal does not expect LTE downlink reception in LTE subframe #2 or LTE subframe #7, or does not decode LTE downlink reception.

As a fourth scheme, whether the UE prefers single UL transmission for the specific band combination (or prefers to avoid IM interference), or prefers simultaneous uplink transmission (or prefers to avoid harmonic interference) It transmits to the (eNB or gNB), and the base station sets a reference TDD configuration to the terminal, thereby scheduling the terminal to perform uplink transmission preferred by the terminal. In the case where the UE instructs the base station to prefer a single UL transmission as a higher signal in the above, HARQ-ACK for a PDSCH transmitted in a plurality of LTE subframes as in the embodiment of FIG. 11 through a reference TDD configuration Can be transmitted through a specific LTE uplink subframe. In the above, when the UE instructs the base station to prefer the simultaneous uplink transmission as a higher signal, the HARQ-ACK for downlink data transmitted in one LTE subframe is conventionally applied by applying the n+4 HARQ timing of the LTE FDD cell. Although transmitted in an LTE uplink subframe, in the present invention, HARQ-ACK for a PDSCH transmitted in a plurality of LTE subframes as in the embodiment in FIG. 12 through a reference TDD configuration is transmitted through a specific LTE uplink subframe. Can be transmitted.

Specifically, in the above, a description will be given of a method of transmitting whether the terminal prefers single UL transmission (or prefers to avoid IM interference) to the base station as a higher signal (capability signaling), the terminal provides a singleUL-Transmission capability. You can report (or do not report the capability to support simultaneous uplink transmission), or report the tdm-pattern capability. Conventionally, when the UE reports a singleUL-Transmission capability to the base station because simultaneous uplink transmission is inherently impossible, the tdm-pattern is set (or reference TDD) for one uplink transmission by additionally reporting the tdm-pattern capability. Configuration, reference TDD configuration), but in the present invention, since it is a terminal capable of simultaneous uplink uplink transmission, it is not necessary to report the singleUL-Transmission capability. It can report the singleUL-Transmission capability and tdm-pattern capability of.

Next, when the terminal simultaneously up-link transmission prefer that described in more detail with respect to how to report (or if preferred to avoid harmonic interference) to a higher signal (signaling capability) to a base station in the terminal's singleUL- Without reporting the transmission capability (or reporting the capability to support simultaneous uplink transmission), only the tdm-pattern capability can be reported. Conventionally, the above tdm-pattern configuration (or reference TDD configuration, reference TDD configuration) is performed for one uplink transmission by additionally reporting the tdm-pattern capability only when the terminal reports the singleUL-Transmission capability to the base station. Although it could be reported that it can support, in the present invention, since it is a terminal capable of simultaneous uplink uplink transmission, in order to avoid harmonic interference, even though the terminal does not need to report the singleUL-Transmission capability, there is no report of the singleUL-Transmission capability. Only the above tdm-pattern capability can be reported.

As a fifth scheme, in a situation where the uplink subframe of the LTE cell and the uplink slot of the NR cell are temporally coincided with the uplink subframe of the LTE cell and the simultaneous uplink transmission in the LTE cell and the NR cell is indicated or configured from the base station, the terminal uses the LTE subframe # It does not expect LTE downlink reception in 2 or LTE subframe #7, or does not decode LTE downlink reception. If simultaneous uplink transmission in the LTE cell and NR cell is not indicated or configured by the base station, that is, when uplink transmission is indicated or configured by the base station in only one of the two cells, in LTE subframe #2 or LTE subframe #7 Decode the LTE downlink reception.

13A is a diagram illustrating a base station procedure according to embodiments proposed in the present invention.

Referring to FIG. 13A, in step 1311, the base station transmits the configuration information of each cell to the terminal through system information or an upper signal as described in FIGS. 11, 12, and subsequent proposals in the present invention to the terminal. The configuration information may be cell-related information of MCG or SCG cells required for dual access (at least one of TDD or FDD information, uplink carrier frequency, uplink frequency band, uplink subcarrier spacing, etc.), and data transmission/reception in the MCG or SCG It may be the setting information required for Alternatively, the configuration information may include at least one of configuration information related to various parameters (reference configuration configuration information, HARQ offset, etc.) described in embodiments of the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

In step 1312, the base station receives the capabilities of the terminal from the terminal as described in Figs.

In step 1313, the base station configures uplink transmission to the terminal and transmits scheduling information instructing uplink transmission according to the present invention proposed in FIGS. 11, 12 and after the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration may mean uplink transmission in which transmission is configured by higher signal configuration without being indicated by the PDCCH, such as periodic channel information transmission, and the uplink transmission indicated by the scheduling information is PUSCH transmission or HARQ-ACK. Like transmission, it may mean uplink transmission indicated by the PDCCH and transmitted from the terminal. Alternatively, it may be uplink transmission from the terminal such as PRACH or SRS.

In step 1313, the base station receives the uplink transmission from the terminal according to the present invention proposed in Figs. 11, 12 and after the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

13B is a diagram illustrating a terminal procedure according to embodiments proposed in the present invention.

Referring to FIG. 13B, in step 1321, the UE receives configuration information of each cell from a base station through system information or an upper signal, as described in FIGS. 11, 12, and subsequent proposals of the present invention. The configuration information may be cell-related information of MCG or SCG cells required for dual access (at least one of TDD or FDD information, uplink carrier frequency, uplink frequency band, uplink subcarrier spacing, etc.), or data from the MCG or SCG It may be configuration information necessary for transmission and reception. Alternatively, the configuration information may include at least one of configuration information related to various parameters (reference configuration configuration information, HARQ offset, etc.) described in embodiments of the present invention. As described in the embodiments of the present invention, before receiving the dynamic power distribution capability from the base station as an upper signal, the terminal may transmit the capability-related information to the base station to the base station. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

In step 1322, the terminal transmits the capability of the terminal to the base station as described in the proposals in FIGS. 11, 12, and the present invention thereafter.

In step 1323, the terminal receives uplink transmission configuration information from the base station according to the present invention proposed in Figs. 11, 12, and subsequent to the present invention, and receives scheduling information indicating uplink transmission. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access. The uplink transmission configuration information may mean configuration information related to uplink transmission that is not indicated by a PDCCH, such as periodic channel information transmission, but transmission is configured by higher signal configuration, and the uplink transmission indicated by the scheduling information is PUSCH It may mean uplink transmission indicated by the PDCCH and transmitted from the terminal, such as transmission or HARQ-ACK transmission. Alternatively, it may be uplink transmission transmitted from a terminal such as PRACH or SRS.

In step 1324, the UE has a HARQ timing relationship (PDSCH-to-PUCCH transmission, PDCCH-to-PUSCH transmission, PUSCH-to-PDCCH transmission, etc.) according to the present invention proposed in Figs. 11, 12 and later. ) To control transmission timing and transmission power to transmit uplink transmission to the base station. Controlling the transmission power may include an operation of dropping uplink transmission or reducing uplink transmission power as described in the embodiments of the present invention. The base station may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

Next, FIG. 14 is a diagram illustrating a base station apparatus according to embodiments proposed in the present invention.

The controller 1401 may set the base station procedure according to the present invention and necessary information according to various embodiments of the present invention, and control uplink transmission timing and uplink transmission reception from the terminal according to various embodiments of the present invention. . The controller 1401 may control to transmit control information through the LTE or 5G control information transmission device 1405, and may transmit data to the terminal through the 5G data transmission/reception device 1407 and receive data from the terminal. In addition, the controller 1401 may schedule LTE or 5G data in the scheduler 1403 to transmit and receive LTE or 5G data to and from the terminal through the LTE or 5G data transmission/reception device 1407.

In the above, the base station device is configured with a controller 1401, a scheduler 1403, a control information transmission device 1405, and a data transmission/reception device 1407, but the base station device may be configured with a transceiver and a controller. The controller may control the operation of the base station according to various embodiments of the present disclosure. In the present base station apparatus, LTE and 5G have been described together for convenience, but the base station apparatus may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

Next, FIG. 15 is a diagram showing a terminal device according to the present invention.

The controller 1501 receives the terminal procedure according to the present invention and configuration information and scheduling required according to various embodiments of the present invention from the base station, and controls uplink transmission timing and uplink transmission power according to the present invention to be set by the base station or It is possible to control to perform uplink transmission indicated by scheduling. The terminal may receive an uplink data channel transmission resource location from a base station through the LTE or 5G control information receiving device 1505 and the LTE or 5G data transmitting and receiving device 1506 or multiplexed and transmit the uplink control information to the uplink data channel. The controller 1501 may control to transmit and receive the LTE or 5G data scheduled at the received resource location with the LTE or 5G base station through the LTE or 5G data transmission/reception device 1506. In the above, the terminal device is composed of a controller 1501, a control information transmission device 1505, and a data transmission/reception device 1506, but the terminal device may also be composed of a transceiver and a controller. The controller may control the operation of the base station according to various embodiments of the present disclosure. In this drawing, for convenience, LTE and 5G devices are described as being together, but devices for LTE or 5G may be configured separately. The base station transmitting and receiving the control information and data may be an NR base station using NR radio access or an E-UTRA base station using E-UTRA radio access.

In addition, the embodiments disclosed in the present specification and the drawings are merely provided specific examples for easy explanation and understanding of the present invention, and are not intended to limit the scope of the present invention. Therefore, the scope of the present invention should be construed that all changes or modified forms derived based on the technical idea of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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