WO2018021881A1 - 이동 통신 시스템에서의 채널 상태 정보 보고 방법 및 장치 - Google Patents
이동 통신 시스템에서의 채널 상태 정보 보고 방법 및 장치 Download PDFInfo
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- WO2018021881A1 WO2018021881A1 PCT/KR2017/008181 KR2017008181W WO2018021881A1 WO 2018021881 A1 WO2018021881 A1 WO 2018021881A1 KR 2017008181 W KR2017008181 W KR 2017008181W WO 2018021881 A1 WO2018021881 A1 WO 2018021881A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Definitions
- the present invention relates to a wireless communication system, and more particularly, a method for measuring channel and interference of a base station and a terminal for efficiently measuring channel characteristics and interference characteristics depending on a support service, a channel state information processing method, and channel state information. It relates to a reporting method and apparatus.
- a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
- 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
- FD-MIMO massive array multiple input / output
- FD-MIMO massive array multiple input / output
- FD-MIMO massive array multiple input / output
- FD-MIMO massive array multiple input / output
- FD-MIMO massive array multiple input / output
- Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
- 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
- cloud RAN cloud radio access network
- D2D Device to Device communication
- D2D Device to Device communication
- CoMP Coordinated Multi-Points
- Hybrid FSK and QAM Modulation FQAM and QAM Modulation
- SWSC Slide Window Superposition Coding
- ACM Advanced Coding Modulation
- FBMC Fan Bank Multi Carrier
- NOMA NOMA
- non orthogonal multiple access non orthogonal multiple access
- SCMA sparse code multiple access
- IoT Internet of Things
- IoE Internet of Everything
- M2M machine to machine
- MTC Machine Type Communication
- IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
- IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
- new radio access technology which is a new 5G communication
- NR new radio access technology
- waveforms, numerologies, and reference signals may be used. It can be allocated dynamically or freely as needed.
- Various methods are needed to satisfy the requirements of such 5G communication system.
- An object of the present invention is to provide a method for providing data transmission and reception for a 5G communication service, and an apparatus according thereto.
- the present invention provides a method for operating a transmission time interval of various lengths and a data transmission / reception method of a base station and a terminal and a device according to the same to satisfy a 5G communication service having various requirements.
- Another object of the present invention is to support various services such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTTC), Ultra-Reliable and Low-latency Communications (URLLC), and Forward Compatiable Resource (FCR).
- eMBB Enhanced Mobile Broadband
- mMTTC Massive Machine Type Communications
- URLLC Ultra-Reliable and Low-latency Communications
- FCR Forward Compatiable Resource
- Another object of the present invention is to propose an operation method and apparatus therefor according to a delay reduction mode of a base station and a terminal when the time required for signal processing of the base station and the terminal can be reduced in an LTE system using FDD or TDD. will be.
- a method of a base station of a mobile communication system comprising: transmitting first information related to hybrid ARQ (HARQ) timing to a terminal through higher layer signaling; Transmitting scheduling information and second information related to the HARQ timing to the terminal; Transmitting data scheduled by the scheduling information to the terminal; And receiving positive acknowledgment or negative acknowledgment (ACK / NACK) information for the data from the terminal according to the HARQ timing determined based on the first information and the second information.
- HARQ hybrid ARQ
- a method of a terminal of a mobile communication system comprising: receiving first information related to hybrid ARQ (HARQ) timing from a base station through higher layer signaling; Receiving scheduling information and second information related to the HARQ timing from the base station; Receiving data scheduled by the scheduling information from the base station; And transmitting positive acknowledgment or negative acknowledgment (ACK / NACK) information for the data to the base station according to the HARQ timing determined based on the first information and the second information.
- HARQ hybrid ARQ
- the base station of the mobile communication system Transmitting and receiving unit for transmitting and receiving a signal; And transmitting first information related to hybrid ARQ (HARQ) timing to higher layer signaling to a terminal, transmitting scheduling information and second information related to the HARQ timing to the terminal, and scheduling the information by the scheduling information to the terminal.
- a control unit which transmits data and controls to receive positive acknowledgment or negative acknowledgment (ACK / NACK) information for the data from the terminal according to the HARQ timing determined based on the first information and the second information. It is characterized by including.
- the terminal of the mobile communication system Transmitting and receiving unit for transmitting and receiving a signal; And receiving first information related to hybrid ARQ (HARQ) timing from a base station through higher layer signaling, receiving scheduling information and second information related to the HARQ timing from the base station, and scheduling the scheduling information by the scheduling information from the base station.
- a control unit configured to receive data and to transmit positive acknowledgment or negative acknowledgment (ACK / NACK) information for the data to the base station according to the HARQ timing determined based on the first information and the second information. It is characterized by including.
- the first information indicates a plurality of possible values related to the HARQ timing and the second information is information indicating one of the plurality of possible values, and a possible value related to the HARQ timing indicates that the data
- a method for transmitting and receiving data for a 5G communication service and an apparatus thereof are provided. Specifically, a method for operating a transmission time interval of various lengths and a data transmission / reception method of a base station and a terminal and a device therefor are provided to satisfy a 5G communication service having various requirements. Through this, transmission time intervals of various lengths can be efficiently multiplexed and operated in one system.
- transmission time intervals of various lengths can be efficiently multiplexed and operated in one system.
- delay time may be reduced during uplink and downlink data transmission.
- control channel structure having a flexible structure for transmitting a downlink control signal, to effectively operate a 5G communication system supporting a variety of services having different requirements simultaneously do.
- FIG. 1 is a diagram illustrating a basic structure of a downlink time-frequency region, which is a radio resource region in which data or control channel of an LTE system is transmitted.
- FIG. 2 is a diagram illustrating an example in which services considered in a 5G system are multiplexed and transmitted to one system.
- 3 and 4 are diagrams showing an embodiment of a communication system to which the present invention is applied.
- 5 is a diagram illustrating subframe structures proposed in this embodiment.
- FIG. 6 is a diagram illustrating a problem to be solved in the present invention.
- FIGS. 9 and 10 are diagrams illustrating Embodiments 1-2 described in the present invention.
- 11 and 12 are diagrams showing Embodiments 1-3 proposed in the present invention.
- FIG. 13 is a diagram illustrating a base station apparatus according to the present invention.
- FIG. 14 is a diagram illustrating a terminal device according to the present invention.
- FIG. 15 is a diagram illustrating radio resources of one subframe and one resource block as the minimum unit of downlink scheduling in LTE and LTE-A systems.
- FIG. 16 is a diagram illustrating an example in which data such as eMBB, URLLC, and mMTC, which are services considered in an NR system, are allocated in a frequency-time resource together with a future compatible resource.
- data such as eMBB, URLLC, and mMTC, which are services considered in an NR system, are allocated in a frequency-time resource together with a future compatible resource.
- FIG. 17 is a diagram illustrating a case where each service is multiplexed in time-frequency resources in an NR system.
- FIG. 18 is a diagram illustrating a service of an interfering cell according to a change in time-frequency resources from the eMBB perspective, and a change in interference situation accordingly.
- 19 illustrates an example of a base station transmitting a CSI-RS in order to measure and report channel state information effectively in an NR system.
- FIG. 23 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.
- 24 is a diagram illustrating the operation of a base station according to an embodiment of the present invention.
- 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- 26 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.
- FIG. 27 illustrates a basic structure of a time-frequency domain, which is a radio resource region of a downlink, in an LTE system or the like.
- FIG. 28 is a diagram illustrating a basic structure of a time-frequency domain that is an uplink radio resource region of an LTE-A system.
- 29 and 30 illustrate examples in which data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, are allocated in frequency-time resources.
- FIG. 31 illustrates a process in which one transport block is divided into several code blocks and a cyclic redundancy check bit is added.
- FIG. 32 is a diagram showing a signal transmission method used by an outer code
- FIG. 33 is a block diagram showing the structure of a communication system in which the outer code is used.
- Fig. 34 is a diagram showing Embodiment 3-1.
- Fig. 35 is a diagram showing Embodiment 3-2.
- Fig. 36 is a diagram showing the third-2-1 embodiment.
- Fig. 37 is a diagram showing the third-2-2 embodiment.
- Fig. 38 is a diagram showing Embodiment 3-2-3.
- Fig. 39 shows the third embodiment.
- 40 is a diagram showing Embodiments 3-5.
- 41 and 42 illustrate a terminal and a base station for performing the above embodiments of the present invention.
- FIG. 43 shows an example in which three services of 5G, eMBB, URLLC, and mMTC, are multiplexed and transmitted in one system.
- FIG. 44 is a diagram illustrating PDCCH and EPDCCH, which are downlink physical channels through which DCI of LTE is transmitted.
- 45 illustrates an example of basic units of time and frequency resources constituting a downlink control channel proposed by the present invention.
- 46 is a diagram illustrating an example of downlink control channel configuration according to embodiment 4-1 of the present invention.
- FIG. 47 is a diagram illustrating an example of time and frequency axis resource configuration for a downlink control channel according to embodiment 4-1 of the present invention.
- 49 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-1 of the present invention.
- FIG. 50 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-1-2 of the present invention.
- FIG. 51 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-1-3 of the present invention.
- 52 is a diagram illustrating an example of downlink transmission according to embodiment 4-1 of the present invention.
- 53 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-4 of the present invention.
- 54 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-5 of the present invention.
- Embodiment 4-2 is a diagram showing Embodiment 4-2 of the present invention.
- FIG. 57 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-1 of the present invention.
- FIG. 58 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-2-1 of the present invention.
- FIG. 59 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-2 of the present invention.
- 60 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-2-2 of the present invention.
- FIG. 61 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-3 of the present invention.
- FIG. 61 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-3 of the present invention.
- FIG. 62 is a diagram showing an example of a frame structure according to Embodiment 4-2-3 of the present invention.
- 63 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-2-3 of the present invention.
- 64 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- 65 is a block diagram showing an internal structure of a base station according to an embodiment of the present invention.
- each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
- Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
- each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
- logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
- the functions noted in the blocks may occur out of order.
- the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
- ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
- ' ⁇ ' is not meant to be limited to software or hardware.
- ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
- ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
- ⁇ unit may include one or more processors.
- mobile communication systems have been developed to provide voice services while guaranteeing user activity.
- mobile communication systems are gradually expanding to not only voice but also data services, and have now evolved to provide high-speed data services.
- a shortage of resources occurs in a mobile communication system in which a service is currently provided, and a more advanced mobile communication system is required because users require higher speed services.
- LTE Long Term Evolution
- 3GPP The 3rd Generation Partnership Project
- LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps.
- various methods are discussed. For example, a method of reducing the number of nodes located on a communication path by simplifying a network structure or a method of bringing wireless protocols as close to a wireless channel as possible is discussed.
- the LTE system adopts a hybrid automatic repeat request (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs during initial transmission.
- HARQ is a technology that allows the transmitter to retransmit the corresponding data in the physical layer by transmitting the information (Negative Acknowledgement, NACK) to inform the transmitter of the decoding failure when the receiver does not correctly decode the data.
- NACK Negative Acknowledgement
- the receiver combines the data retransmitted by the transmitter with previously decoded data and decodes the data to increase the data reception performance.
- the receiver may transmit an acknowledgment (ACK) indicating the decoding success to the transmitter so that the transmitter may transmit new data.
- ACK acknowledgment
- FIG. 1 is a diagram illustrating a basic structure of a downlink time-frequency region, which is a radio resource region in which data or control channel of an LTE system is transmitted.
- 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, N symb (102) OFDM symbols are gathered to form one slot 106, two slots are gathered to form one subframe (105).
- the length of the slot is 0.5ms and the length of the subframe is 1.0ms.
- 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 consists of N BW 104 subcarriers in total.
- the basic unit of a resource in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as a resource element (RE) 112.
- a resource block (RB or Physical Resource Block, PRB) 108 is defined as N symb 102 consecutive OFDM symbols in the time domain and N RB 110 consecutive subcarriers in the frequency domain.
- one RB 108 is composed of N symb x N RB REs 112.
- the minimum transmission unit of data is the RB unit.
- the data rate increases in proportion to the number of RBs scheduled to the UE.
- the LTE system defines and operates six transmission bandwidths. In an FDD system in which downlink and uplink are divided into frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different.
- the channel bandwidth represents an RF bandwidth corresponding to the system transmission bandwidth. Table 1 below shows a correspondence relationship between a system transmission bandwidth and a channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth consists of 50 RBs.
- the downlink control information is transmitted within the first N OFDM symbols in the subframe.
- N ⁇ 1, 2, 3 ⁇ . Accordingly, the N value varies from subframe to subframe according to the amount of control information to be transmitted in the current subframe.
- the control information includes a control channel transmission interval indicator indicating how many control information is transmitted over OFDM symbols, scheduling information for downlink data or uplink data, HARQ ACK / NACK signal, and the like.
- DCI downlink control information
- UL refers to a radio link through which the terminal transmits data or control signals to the base station
- DL downlink refers to a radio link through which the base station transmits data or control signals to the terminal.
- DCI is defined in various formats, whether it is scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data, whether it is compact DCI with a small size of control information, multiple The DCI format determined according to whether spatial multiplexing using an antenna is applied to data or whether power control is used is applied.
- DCI format 1 which is scheduling control information 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.
- resources are allocated in units of resource block groups (RBGs) by applying a bitmap method.
- a basic unit of scheduling is a resource block (RB) represented by time and frequency domain resources, and an RBG is composed of a plurality of RBs to become a basic unit of scheduling in a type 0 scheme.
- Type 1 allows allocating a specific RB within the RBG.
- Resource block assignment Notifies the RB allocated for data transmission.
- the resource to be represented is determined according to the system bandwidth and the resource allocation method.
- Modulation and coding scheme Notifies the modulation scheme used for data transmission and the size of a transport block that is data to be transmitted.
- HARQ process number Notifies the process number of HARQ.
- New data indicator notifies whether the data transmission is HARQ initial transmission or retransmission.
- Redundancy version Notifies the redundant version of HARQ.
- TPC Transmit Power Control
- PUCCH Physical Uplink Control Channel
- the DCI is transmitted through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), which is a downlink physical control channel through channel coding and modulation.
- PDCH physical downlink control channel
- EPDCCH enhanced PDCCH
- the DCI is channel-coded independently for each user equipment and then composed of independent PDCCHs and transmitted.
- the PDCCH is mapped and transmitted during the control channel transmission interval, and the frequency domain mapping position of the PDCCH is determined by an identifier (ID) of each terminal and spread over the entire system transmission band.
- ID an identifier
- the downlink data is transmitted through a physical downlink shared channel (PDSCH) which is a downlink physical data channel.
- PDSCH physical downlink shared channel
- Downlink data on a PDSCH is transmitted after the control channel transmission interval.
- Scheduling information such as specific mapping positions and modulation schemes of data in a frequency domain is indicated by a DCI transmitted through the PDCCH.
- the base station notifies the UE of a modulation scheme applied to downlink data to be transmitted and a transport block size (TBS) of data to be transmitted through an MCS configured of 5 bits among the control information configuring the DCI.
- TBS corresponds to the size before channel coding for error correction is applied to data to be transmitted by the base station (which can be understood as a transport block).
- Modulation methods 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, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.
- QPSK Quadrature Phase Shift Keying
- 16QAM Quadrature Amplitude Modulation
- 64QAM 64QAM
- each modulation order (Q m ) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.
- the PDCCH transmission may be mixed with the DCI transmission on the PDCCH
- the PDSCH transmission may be mixed with the downlink data transmission on the PDSCH.
- bandwidth extension technology has been adopted to support higher data throughput compared to LTE Release 8.
- the technique called bandwidth extension or carrier aggregation (CA), can increase the amount of data transmission by an extended band compared to an LTE release 8 terminal that transmits data in one band by extending the band.
- Each of the bands is called a component carrier (CC), and LTE release 8 terminals are defined to have one component carrier for downlink and uplink, respectively.
- a downlink component carrier and an uplink component carrier connected to a system information block (SIB) -2 are collectively called a cell.
- SIB-2 connection relationship between the downlink component carrier and the uplink component carrier is transmitted as a system signal or a higher layer signal.
- the terminal supporting the CA may receive downlink data through a plurality of serving cells and transmit uplink data.
- a Carrier Indicator Field may be set as a field indicating that indication is indicated.
- the CIF may be set to a terminal supporting the CA.
- the CIF is determined to add 3 bits to the DCI in a specific serving cell to indicate another serving cell, and the CIF is included in the DCI only when cross carrier scheduling is performed. Carrier scheduling is not performed.
- the CIF When the CIF is included in downlink resource allocation information (which can be mixed with DL assignment, DL grant, DCI, etc.), the CIF indicates a serving cell to which a PDSCH scheduled by downlink allocation information is to be transmitted.
- the CIF When included in uplink resource allocation information (which can be mixed with UL grant, DCI, etc.), the CIF is defined to indicate a serving cell to which a PUSCH scheduled by uplink resource allocation information is to be transmitted.
- a CA which is a bandwidth extension technology
- a plurality of serving cells may be configured in the terminal.
- the terminal transmits channel information about the plurality of serving cells periodically or aperiodically 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 HARQ A / N feedback for the data transmitted for each carrier to the base station.
- LTE Release 10 is designed to transmit up to 21 bits of A / N feedback, and transmits A / N feedback and drops channel information when A / N feedback and channel information overlap in one subframe. It was.
- channel information of one cell is multiplexed along with A / N feedback, so that up to 22 bits of A / N feedback and one cell channel information are transmitted according to PUCCH format 3 transmission resource.
- LTE Release 13 a maximum of 32 serving cell configuration scenarios are assumed, and the number of serving cells is expanded to 32 by using a band in an unlicensed band as well as a licensed band.
- LTE Release 13 introduced a technology for providing LTE services in an unlicensed band such as the 5 GHz band in consideration of the limited number of licensed bands such as the LTE frequency band, which is called LAA (Licensed Assisted Access).
- LAA Licensed Assisted Access
- CA technology in LTE is applied to operate the LTE cell, which is a licensed band, as a Pcell, and the LAA cell, which is an unlicensed band, as an S cell.
- LTE refers to including all of LTE evolution technology, such as LTE-A, LAA.
- 5G system 5th generation wireless cellular communication system
- 5G system 5th generation wireless cellular communication system
- 5G systems should be able to freely reflect various requirements such as users and service providers. Therefore, 5G systems must be able to support services that meet various requirements.
- 5G offers a variety of 5G-oriented services such as Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (MMTC), and Ultra Reliable and Low Latency Communications (URLLC).
- eMBB Enhanced Mobile BroadBand
- MMTC Massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communications
- 5G-oriented services such as Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (MMTC), and Ultra Reliable and Low Latency Communications (URLLC).
- eMBB Enhanced Mobile BroadBand
- MMTC Massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communications
- one base station in order to provide an eMBB service in 5G, one base station should be able to provide a maximum transmission speed of 20 Gbps in downlink and a maximum transmission speed of 10 Gbps in uplink. At the same time, the average transmission speed that the terminal can actually feel should also be increased. To meet these requirements, improvements in transmission and reception techniques, including advanced multiple-input multiple output (MIMO) transmission techniques, are required.
- MIMO multiple-input multiple output
- mMTC services are being considered to support application services such as the Internet of Thing (IoT) in 5G.
- IoT Internet of Thing
- the mMTC needs to support access of a large terminal in a cell, improve coverage of the terminal, improved battery time, and reduce cost of the terminal.
- the IoT is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (for example, 1,000,000 terminals / km 2 ) in a cell.
- mMTC is more likely to be located in a shadow area such as the basement of a building or an area that a cell cannot cover due to the characteristics of the service, it requires more coverage than the coverage provided by eMBB.
- the mMTC is likely to be composed of a low-cost terminal and because the battery of the terminal is often difficult to replace, a very long battery life time of the terminal is required.
- URLLC cellular-based wireless communications are used for specific purposes. These services are used for remote control of robots or mechanical devices, industrial automation, unmanned aerial vehicles, remote health control, and emergency alerts. It must provide communication that provides delay and ultra-reliability. For example, URLLC has a requirement to satisfy a maximum delay of less than 0.5 ms and at the same time provide a packet error rate of 10 -5 or less. Therefore, URLLC requires a smaller Transmit Time Interval (TTI) than 5G services such as eMBB, and at the same time requires a design that needs to allocate a wider resource in the frequency band.
- TTI Transmit Time Interval
- the services considered in the above-mentioned fifth generation wireless cellular communication system should be provided as a framework. That is, for efficient resource management and control, it is preferable that the services are integrated and controlled and transmitted into one system, rather than each service operating independently.
- FIG. 2 is a diagram illustrating an example in which services considered in a 5G system are multiplexed and transmitted to one system.
- the frequency-time resource 200 used by the 5G system may include a frequency axis 210 and a time axis 220.
- 2 illustrates a case in which the eMBB 240, mMTC 250, and URLLC 260 services are operated by a 5G base station within a framework.
- an enhanced mobile broadcast / multicast service (eMBMS) 270 for providing a broadcast service based on cellular communication may be considered as a service that may be additionally considered in a 5G system.
- Services considered in 5G systems such as eMBB 240, mMTC 250, URLLC 260, and eMBMS 270 may be time-division multiplexing (TDM) within one system frequency bandwidth operating in 5G systems. Multiplexing and transmission may be performed through frequency division multiplexing (FDM), and spatial division multiplexing may also be considered.
- TDM time-division multiplexing
- the eMBB 240 it is preferable to occupy the maximum frequency bandwidth at a certain arbitrary time in order to provide the increased data transmission rate described above. Accordingly, in the case of the eMBB 240 service, it is preferable to transmit TDM in another service and system transmission bandwidth 200, but may be FDM transmitted in other services and system transmission bandwidth according to the needs of other services.
- the mMTC 250 unlike other services, an increased transmission interval is required to secure wide coverage, and the coverage may be secured by repeatedly transmitting the same packet within the transmission interval. At the same time, there is a limit on the transmission bandwidth that the terminal can receive in order to reduce the complexity of the terminal and the terminal price. Given this requirement, the mMTC 250 is preferably transmitted FDM with other services within the transmission system bandwidth 200 of the 5G system.
- the URLLC 260 preferably has a short Transmit Time Interval (TTI) when compared to other services to satisfy the ultra-delay requirement required by the service. At the same time, it is desirable to have a wide bandwidth on the frequency side because it has to have a low coding rate in order to satisfy the super reliability requirements. Given this requirement of URLLC 260, it is desirable that URLLC 260 be TDM with other services within transmission system bandwidth 200 of a 5G system.
- TTI Transmit Time Interval
- the 5G communication system should be designed so that the services considered after the 5G communication system coexist and operate efficiently with the 5G communication system.
- resources should be freely allocated and services can be transmitted so that services to be considered in the future can be freely transmitted in the time-frequency resource area supported by the 5G communication system.
- Each of the above-described services may have 7 different transmission / reception schemes and transmission / reception parameters to satisfy the requirements required by each service.
- each service can have different numerology according to each service requirement.
- the numerology is a cyclic prefix (CP) length and a subcarrier spacing in a communication system based on orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA). Subcarrier spacing), the length of an OFDM symbol, a transmission time interval (TTI), and the like.
- the eMBMS 207 may have a longer CP length than other services. Since the eMBMS 270 transmits broadcast-based higher traffic, all cells can transmit the same data. In this case, if a signal received from a plurality of cells arrives at a terminal delayed within a CP length, the terminal may receive and decode all of these signals, thereby obtaining a single frequency network diversity gain.
- the terminal located at the boundary also has an advantage of receiving broadcast information without coverage limitation.
- CP length is relatively longer than other services, waste of CP overhead occurs, so eMBMS requires longer OFDM symbol length than other services at the same time. Narrower subcarrier spacing is required.
- a different TN is used between services in a 5G system.
- a shorter OFDM symbol length may be required, and at the same time, a wider subcarrier interval may be required.
- frequency bands that 5G systems are expected to operate range from a few GHz to several tens of GHz, and frequency division duplex (FDD) is preferred to time division duplex (TDD) in low frequency GHz bands, and high frequency tens of GHz bands TDD is considered to be suitable for FDD.
- FDD frequency division duplex
- TDD time division duplex
- TDD time division duplex
- the terminal needs a scheme for decoding services transmitted to the terminal in each transmission time interval.
- the embodiments of the present invention will be described in detail, but the LTE and 5G system will be the main target, but the main gist of the present invention does not significantly depart from the scope of the present invention in other communication systems having a similar technical background and channel form. It can be applied with a slight modification in the range that will be possible in the judgment of those skilled in the art of the present invention.
- 5G cells operate in a non-stand alone mode, combined with dual connectivity or CA with a 5G communication system or other standalone 5G cells operating stand-alone.
- the 5G communication system will be described.
- FIG. 3 and 4 are diagrams showing an embodiment of a communication system to which the present invention is applied.
- the methods proposed in the present invention can be applied to both the system of FIG. 3 and the system of FIG. 4.
- (a) 300 of FIG. 3 illustrates a case in which a 5G cell 320 operates in a standalone manner within one base station 310 in a network.
- the terminal 330 is a 5G capable terminal having a 5G transmission / reception module. After the terminal 330 acquires synchronization through the synchronization signal transmitted from the 5G standalone cell 320 and receives the system information, the terminal 330 attempts random access to the 5G base station 310. The terminal 330 transmits and receives data through the 5G cell 320 after an RRC connection (RRC) connection with the 5G base station 310 is established. In this case, there is no restriction on the duplex scheme of the 5G cell 320.
- the 5G cell may include a plurality of serving cells.
- FIG. 3B illustrates a case in which the 5G standalone base station 355 and the 5G non-stand alone base station 360 are installed to increase data transmission.
- the terminal 370 is a 5G capable terminal having a 5G transmission / reception module for performing 5G communication with a plurality of base stations.
- the 5G capable terminal may be a terminal supporting only one 5G service or may be a terminal supporting a plurality of 5G services.
- a terminal supporting only one 5G service may support one numerology, and a terminal supporting a plurality of 5G services may support a plurality of numerologies.
- the terminal 370 acquires synchronization through a synchronization signal transmitted from the 5G standalone base station 355 and attempts random access to the 5G standalone base station 355 after receiving system information. After the RRC connection with the 5G standalone base station 355 is established, the terminal 370 additionally sets the 5G non-standalone cell 380 and the 5G standalone base station 355 or the 5G non-standalone base station ( 360) transmit and receive data.
- the 5G standalone base station 355 and the 5G non-standalone base station 360 are ideal backhaul networks. Assume that they are connected by a non-ideal backhaul network. Therefore, in case of having an ideal backhaul network 365, fast X2 communication between base stations is possible.
- the 5G cell may include a plurality of serving cells.
- (a) 400 of FIG. 4 illustrates a case in which an LTE cell 420 and a 5G cell 430 coexist in one base station 410 in a network.
- the terminal 440 may be an LTE capable terminal having an LTE transmit / receive module, may be a 5G capable terminal having a 5G transmit / receive module, or may be a terminal simultaneously having an LTE transmit / receive module and a 5G transmit / receive module.
- the 5G capable terminal having the 5G transmission / reception module may be a terminal supporting only one 5G service or a terminal supporting a plurality of 5G services.
- a terminal supporting only one 5G service may support one numerology, and a terminal supporting a plurality of 5G services may support a plurality of numerologies.
- the terminal 440 acquires synchronization through a synchronization signal transmitted from the LTE cell 420 or the 5G cell 430 and receives the base station 410 and the LTE cell 420 or the 5G cell 430 after receiving system information. Send and receive data through In this case, there is no restriction on the duplex scheme of the LTE cell 420 or the 5G cell 430.
- the uplink control information is transmitted through the LTE cell 420 when the LTE cell is a P cell, and is transmitted through the 5G cell 430 when the 5G cell is a P cell.
- the LTE cell and the 5G cell may include a plurality of serving cells, and all of them may support 32 serving cells.
- the base station 410 includes both an LTE transmission / reception module (system) and a 5G transmission / reception module (system), and the base station 410 may manage and operate the LTE system and the 5G system in real time. .
- the base station can dynamically select the time resource allocation of the LTE system and the 5G system.
- the terminal 440 receives a signal from the LTE cell 420 or 5G cell 430 to indicate the allocation of resources (time resources or frequency resources or antenna resources or spatial resources, etc.) that the LTE cell and 5G cells are divided and operated. By receiving, it is possible to know through which resources the data transmission and reception on the LTE cell 420 and the 5G cell 530 are made.
- FIG. 4B illustrates a case in which an LTE macro base station 455 for wide coverage and a 5G small base station 460 for increasing data throughput are installed in a network.
- the terminal 470 may be an LTE capable terminal having an LTE transmit / receive module, may be a 5G capable terminal having a 5G transmit / receive module, or may be a terminal simultaneously having an LTE transmit / receive module and a 5G transmit / receive module.
- the 5G capable terminal having the 5G transmission / reception module may be a terminal supporting only one 5G service or a terminal supporting a plurality of 5G services.
- a terminal supporting only one 5G service may support one numerology, and a terminal supporting a plurality of 5G services may support a plurality of numerologies.
- the terminal 470 acquires synchronization through a synchronization signal transmitted from the LTE base station 455 or the 5G base station 460 and transmits and receives data through the LTE base station 455 and the 5G base station 460 after receiving system information. .
- the uplink control information is transmitted through the LTE cell 480 when the LTE cell is a P cell, and is transmitted through the 5G cell 475 when the 5G cell is a P cell.
- the LTE base station 455 and the 5G base station 460 have an ideal backhaul network or a non-ideal backhaul network.
- the LTE cell and the 5G cell may include a plurality of serving cells, and together, 32 serving cells may be supported.
- the base station 455 or 460 may manage and operate the LTE system and the 5G system in real time. For example, when the LTE base station 455 divides resources in time and operates the LTE system and the 5G system at different times, the LTE base station dynamically allocates time resources of the LTE system and the 5G system, and assigns the signal to the 5G base station 460 using the X2 interface. It is possible to send to).
- the terminal 470 is a resource (time resource or frequency resource or antenna resource or spatial resource, etc.) that the LTE cell and 5G cell divided from the LTE base station 455 or 5G base station 460 By receiving a signal indicating the allocation of the data transmission and reception on the LTE cell 480 and 5G cell 475 can be seen through what resources.
- the base station 455 or 460 can operate the LTE system and the 5G system semi-statically. For example, when the base station 455 divides resources in time and operates the LTE system and the 5G system at different times, the base station 455 allocates time resources of the LTE system and the 5G system, and transmits the signals to other base stations 460 in advance through the X2 interface. It is possible to distinguish resources between systems and 5G systems.
- the terminal 470 is a resource (time resource or frequency resource or antenna resource or spatial resource, etc.) that the LTE cell and 5G cell divided from the LTE base station 455 or 5G base station 460 By receiving a signal indicating the allocation of the data transmission and reception on the LTE cell 480 and 5G cell 475 can be seen through what resources.
- FIG. 5 is a diagram illustrating subframe structures proposed in this embodiment. Subframe structures in a transmission time interval that various services may have in the 5G communication system will be described with reference to the upper and lower parts of FIG. 5.
- the upper and lower X1 510 and X2 530 of FIG. 5 illustrate various transmission time intervals that can be used by a specific service or a terminal of a specific service, and subframe structures 512 to 522 in each transmission time interval. And 532-542 are shown.
- X1 may be 1 ms and X2 may be 0.5 ms.
- X1 and X2 are for explaining relative transmission time intervals, and in 5G communication system, only one transmission time interval may be used, and at least one (X1, X2, X3, . «) Of various transmission time intervals is multiplexed. May be used.
- a unit of signals transmitted in one transmission time interval is referred to as a subframe, a slot, or a mini-slot
- the subframe includes at least one downlink symbol 500 or protection symbol 502 or uplink symbol ( 504).
- OFDM orthogonal frequency division multiple access
- such a symbol may be defined as an OFDM symbol, and the length of the OFDM symbol may vary depending on the subcarrier spacing, the CP length, and the bandwidth size.
- Which subframes 514, 516, 518, 520 and 522 are used is indicated to the terminal by the base station, and the terminal transmits the subframes 514, 516, 518, 520 and 522 through a higher layer signal or a physical signal.
- the position and number of each subframe 514, 516, 518, 520, and 522 may be set by a higher layer signal in advance so that the UE may acquire relevant information or indicated by a physical signal to indicate every subframe or previous subframe.
- the UE may acquire the type of the next subframe.
- Each subframe consists of at least one down symbol 500 or protection symbol 502 or up symbol 504, and the down symbol 500 is used for downlink control information and downlink data transmission.
- the protection symbol 502 guarantees the RF switching time of the terminal or the base station when the symbols on both sides of the protection symbol are in different directions (that is, up and down) in consideration of two subframes in one subframe or subsequent subframes. Delay time due to the distance of the base station or the like is used to absorb in the protection symbol 502.
- the protection symbol 502 is used to ensure the processing time of the terminal having the capability (capability) to receive the downlink data and transmit the uplink control information for the downlink data in the one subframe.
- the number of protection symbols 502 in the one subframe is preset by the base station in consideration of the RF switching times and the cell radius of the UE in the cell, and the UE is connected to the number of protection symbols in the subframe through a higher layer signal.
- Information may be obtained from a base station.
- the uplink symbol 504 is used for uplink control information and uplink data transmission.
- the number of uplink symbols 504 in one subframe is preset by the base station in consideration of uplink control information according to cell radius and coverage of uplink data transmission and the like. Information on the number of can be obtained from the base station.
- each subframe structure corresponding to the transmission time interval X1 510 is as follows.
- the subframe 512 includes only the downlink symbol 500.
- the subframe 514 is composed of a downlink symbol 500 and a protection symbol 502.
- the subframe 516 is composed of a down symbol 500, a protection symbol 502, and an up symbol 504.
- the subframe 516 is a structure capable of transmitting and receiving downlink control information and downlink data, and transmitting and receiving uplink control information on the downlink data in the same subframe.
- the subframe 518 is composed of a down symbol 500, a protection symbol 502, and an up symbol 504.
- the subframe 518 is a structure capable of transmitting and receiving downlink control information and transmitting and receiving uplink data indicated by the downlink control information in the same subframe.
- the subframe 520 is composed of a protection symbol 502 and an uplink symbol 504.
- the subframe 522 consists only of the uplink symbol 504.
- each subframe structure corresponding to the transmission time interval X2 530 is as follows.
- the subframe 532 consists only of the downlink symbol 500.
- the subframe 534 is composed of a downlink symbol 500 and a protection symbol 502.
- the subframe 536 includes a down symbol 500, a protection symbol 502, and an up symbol 504.
- the subframe 536 is a structure capable of transmitting and receiving downlink control information and downlink data, and transmitting and receiving uplink control information for the downlink data in the same subframe.
- the subframe 538 is composed of a down symbol 500, a protection symbol 502, and an up symbol 504.
- the subframe 538 has a subframe structure capable of transmitting and receiving downlink control information and transmitting uplink data indicated by the downlink control information in the same subframe.
- the subframe 540 is composed of a protection symbol 502 and an uplink symbol 504.
- the subframe 542 consists only of the uplink symbol 504.
- FIG. 6 is a diagram illustrating a problem to be solved in the present invention.
- one carrier in particular, TDD is represented by a subframe 620 according to the transmission time interval X1 600 and a subframe 630 by the X2 610 having a different transmission time interval from the transmission time interval X1 600.
- the situation is mixed and multiplexed within a carrier.
- the subframe by the transmission time interval X1 600 is composed of a downlink symbol, a protection symbol, and an uplink symbol.
- the subframe by the X2 610 is also composed of a downlink symbol, a protection symbol, and an uplink symbol.
- X1 is twice the length of X2, it can be seen that the subframe length by X1 corresponds to the length of two subframes by X2.
- the downlink symbol of the subframe 620 by X1 is present at the same time as the uplink symbol in the subframes 630 configured by X2 (640). That is, reception of downlink data of a terminal receiving a service based on X1 and transmission of uplink data of a terminal receiving a service based on X2 are performed at the same time.
- downlink data reception of a terminal receiving a service based on X1 may be interrupted by uplink data transmission of a terminal receiving a service based on X2, and a base station receives uplink data receiving based on X2 and downlink based on X1. Link data transmission must be performed simultaneously.
- the present invention proposes a scheme for solving the above problems and a scheme for multiplexing various transmission time intervals.
- FIG. 7 illustrates an example of informing a subframe structure through a common transmission time interval and a dedicated transmission time interval, and performing control information and data transmission according to the subframe structure in a dedicated transmission time interval.
- a common transmission time interval 700 and a dedicated transmission time interval 710 are set.
- the common transmission time interval 700 is a transmission time interval for determining a subframe structure to be used by all terminals in a base station and a cell in the common transmission time interval 700.
- a dedicated transmission time interval is determined based on the common transmission time interval. Can be set. That is, the length of the common transmission time interval may be set as a multiple of the length of the dedicated transmission time interval.
- the common transmission time interval is applied to all the terminals in the cell, and the dedicated transmission time interval may be applied to the terminal that actually transmits and receives data. Even if the terminal is not set up and downlink data transmission and reception by the base station, communication with the base station may be required, so setting of a common transmission time interval is necessary.
- the subframe structure may be set in advance for a predetermined time and may be indicated to the UE, and in this case, the subframe structure may be transmitted through a higher layer signal including a system signal and an RRC signal.
- the subframe structure may be instructed by the UE after being changed in every common transmission time interval, and in this case, the subframe structure may be transmitted through a physical signal.
- a decoding operation of a terminal for searching for a subframe structure (that is, receiving subframe structure information) may be performed according to the common transmission time interval 700.
- the current subframe structure or the subframe structure for the next common transmission time interval may be determined by transmitting control information of the base station in the first symbol at which the common transmission time interval 700 starts, and the terminal transmits every common transmission time.
- a subframe structure may be obtained through control information decoding in the first symbol at which the section 700 starts.
- the subframe structure includes the subframe structure described with reference to FIG. 5.
- the dedicated transmission time interval 710 may be a transmission time interval for transmitting control information to the terminal and for transmitting data information, and may set a dedicated transmission time interval 710 having a different length for each service.
- the dedicated transmission time interval 710 has a length corresponding to half of the common transmission time interval 700, and control information including subframe structure information according to the length and data information scheduled by the control information are included. Is sent.
- the subframe structure information may include subframe structure information for a dedicated transmission time interval.
- the dedicated transmission time interval 730 has the same length as that of the common transmission time interval 700, and control information including subframe structure information according to the length and data information scheduled by the control information are included. Is sent.
- a common transmission time interval and a dedicated transmission time interval are defined differently from (a) of FIG. 7 through (b) of FIG. 7 to describe an example in which the base station and the terminal operate.
- a common transmission time interval 760 and a dedicated transmission time interval 750 are set, respectively.
- the length of the dedicated transmission time interval may be set as a multiple of the length of the common transmission time interval.
- the common transmission time interval 760 means a period during which the terminal should attempt to decode a signal transmitted by the base station in order to find a position where the subframe structure used in the dedicated transmission time interval starts. can do.
- the subframe structure is changed in every dedicated transmission time interval, and this change may be indicated to the terminal, in which case the subframe structure may be transmitted through a physical signal.
- a decoding operation of the terminal for searching for a position where the subframe structure starts (that is, receiving subframe structure information) may be performed according to the common transmission time interval 760.
- the start position of the current subframe structure or the subframe structure for the next common transmission time interval may be determined by transmitting control information of the base station in the first symbol at which the common transmission time interval 760 starts.
- the position at which the subframe structure of the dedicated transmission time interval starts may be obtained by decoding the control information in the first symbol at which the common transmission time interval 760 starts.
- the subframe structure includes the subframe structure described with reference to FIG. 5.
- the dedicated transmission time interval 760 is a transmission time interval for transmitting control information and data information to the terminal, and it is possible to set a dedicated transmission time interval 750 having a different length for each service.
- the dedicated transmission time interval 750 has a length corresponding to twice the common transmission time interval 760 and includes control information including subframe structure information according to the length and data information scheduled by the control information. Is sent.
- FIG. 8 is a diagram illustrating a procedure of a base station and a terminal for the method described with reference to FIG.
- 8A is a diagram illustrating a base station procedure according to embodiment 1-1 of the present invention.
- the base station transmits transmission time interval setting information to the terminal.
- the transmission time interval setting information includes common transmission time interval and dedicated transmission time interval related information as described in FIG. 7A, and the configuration information includes a higher layer including a system signal and / or an RRC signal. It is transmitted to the terminal through a signal or a physical signal.
- the subframe structure may be predetermined for a predetermined time and transmitted to the UE through an upper layer signal or a physical signal including a system signal and / or an RRC signal.
- the base station transmits control information including data scheduling information for 5G service to the terminal.
- the control information may include a subframe structure according to a common transmission time interval.
- the control information may be a subframe structure for the current common transmission time interval or the next common transmission time interval.
- the control information may include subframe structure information for the dedicated transmission time interval.
- the control information may be transmitted in the first symbol of the subframe.
- the data scheduling information includes all scheduling information for a service considered for the 5G system as described in the present invention, and the scheduling information includes information indicating a frequency resource or a time resource for data transmission of the 5G service.
- the data scheduling information may be transmitted by a higher layer signal or a physical signal.
- the base station transmits and receives data with the terminal according to the control information for the 5G service.
- the control information may include a subframe structure as described in step 810.
- the base station transmits and receives data with the terminal according to the indicated subframe structure.
- 8B is a diagram illustrating a terminal procedure according to embodiment 1-1 of the present invention.
- the terminal receives the transmission time interval setting information from the base station.
- the transmission time interval setting information includes common transmission time interval and dedicated transmission time interval related information as described in (a) of FIG. 7 and the configuration information includes a higher layer signal including a system signal and / or an RRC signal. Or it is transmitted to the terminal through a physical signal.
- the subframe structure may be predetermined for a predetermined time and transmitted to the UE through a higher layer signal or a physical signal including a system signal and / or an RRC signal.
- the terminal attempts to receive control information including data scheduling information for 5G service from the base station.
- the control information may include a subframe structure according to a common transmission time interval, and the control information may be a subframe structure for a current common transmission time interval or a next common transmission time interval.
- the control information may include subframe structure information for the dedicated transmission time interval.
- the control information may be transmitted in the first symbol of the subframe.
- the data scheduling information includes all scheduling information for a service considered for the 5G system as described in the present invention, and the scheduling information includes information indicating a frequency resource or a time resource for data transmission of the 5G service.
- the data scheduling information may be transmitted by an upper signal or a physical signal.
- step 870 the UE transmits and receives data to the base station according to the control information for the 5G service.
- the control information may include a subframe structure as described in step 860.
- the terminal transmits and receives data according to the indicated subframe structure.
- FIGS. 9 and 10 are diagrams illustrating Embodiments 1-2 described in the present invention.
- the base station informs the UE of the subframe structure for the common transmission time period through FIG. 9, when the first symbol of the subframe is an uplink symbol for which downlink control information cannot be transmitted, the next subframe based on the previous subframe structure Describe how to determine the structure.
- This method may be applied when a corresponding subframe structure is notified every subframe, and the UE can know the structure of the current subframe by decoding a signal transmitting the subframe structure.
- a common transmission time interval 900 or 910 is set and a subframe structure having a length of the common transmission time interval is determined.
- the terminal indicates the uplink symbol. Control information indicating a subframe structure to be started cannot be transmitted.
- the terminal may determine the subframe structure transmitted in the next common transmission time interval 910 based on the subframe structure of the previous common transmission time interval 900.
- the subframe structure of the previous common transmission time interval 900 consists only of downlink symbols at 920
- the subframe structure of the next common transmission time interval 910 should start with a protection symbol between the downlink symbol and the uplink symbol. Therefore, even if the UE attempts to decode downlink control information including a subframe structure 940 and fails to obtain downlink control information, it can be seen that the 910 has an uplink subframe structure composed of a protection symbol and an uplink symbol.
- the subframe structure of the next common transmission time interval 910 should start with an uplink symbol. Therefore, even if the UE attempts to decode downlink control information including the subframe structure (945), when it cannot acquire the downlink control information, it can be seen that the 910 has an uplink subframe structure composed of only uplink symbols.
- the subframe structure of the previous common transmission time interval 900 is composed of a downlink symbol, a protection symbol, and an uplink symbol at 930
- the subframe structure of the next common transmission time interval 910 should start with an uplink symbol. Therefore, even if the UE attempts to decode downlink control information including the subframe structure 950 and fails to acquire the downlink control information, it can be seen that the 910 has an uplink subframe structure including only uplink symbols.
- the subframe structure of the next common transmission time interval 910 should be a subframe structure starting with an uplink symbol. do. Therefore, even if the UE attempts to decode downlink control information including the subframe structure (955), when the UE fails to acquire the downlink control information, it can be seen that the 910 has an uplink subframe structure including only uplink symbols.
- FIG. 10 is a diagram illustrating a procedure of a terminal with respect to embodiment 1-2 described with reference to FIG. 9.
- the UE acquires a subframe structure beginning with a downlink symbol from the base station in the transmission time interval n.
- the subframe structure beginning with the downlink symbol may be one of the subframe structures shown in FIG. 5.
- the transmission time interval setting information includes common transmission time interval and dedicated transmission time interval related information as described in FIG. 7A, and the configuration information includes a higher layer including a system signal and / or an RRC signal. It is transmitted to the terminal through a signal or a physical signal.
- the subframe structure may be predetermined for a predetermined time and transmitted to the UE through an upper layer signal or a physical signal including a system signal and / or an RRC signal.
- the UE determines whether to obtain downlink control information by attempting to receive downlink control information including a subframe structure from a base station in a transmission time interval n + 1.
- the control information may include a subframe structure according to a common transmission time interval, and the control information may be a subframe structure for a current common transmission time interval or a next common transmission time interval.
- the control information may be transmitted in the first symbol of the subframe.
- the UE acquires the subframe structure of the transmission time interval n + 1 included in the downlink control information in step 1020.
- the UE acquires the subframe structure of the transmission time interval n + 1 based on the subframe structure of the transmission time interval n in step 1030.
- a detailed method follows the method described with reference to FIG. 9.
- 11 and 12 are diagrams showing Embodiments 1-3 proposed in the present invention.
- FIG. 11 shows a subframe structure to the UE through a common transmission time interval and a dedicated transmission time interval, and in the dedicated transmission time interval, the base station performs downlink data transmission according to the subframe structure and determines whether data is properly received by the terminal.
- a method of transmitting uplink feedback information is described.
- the common transmission time interval 1100 and the dedicated transmission time interval 1110 of FIG. 11 may follow the description of FIGS. 7A and 7B.
- Uplink feedback information 1120 for downlink data transmitted according to the subframe structure in the dedicated transmission time interval and uplink feedback information 1130 for data transmitted according to the subframe structure according to the length of the common transmission time interval. ) May be multiplexed to be transmitted at the same time.
- the first method for multiplexing uplink feedback information is for the UE to transmit feedback information on each uplink control channel for feedback transmission on data transmitted in the other transmission time intervals. At this time, when the power of the terminal is not enough, the power can be adjusted first for the feedback for the data corresponding to the dedicated transmission time interval to protect the feedback for the data to be transmitted in the common transmission time interval.
- a terminal transmits feedback information on one uplink control channel for feedback transmission on data transmitted in the other transmission time intervals, but the feedback information is fixed. Is to multiplex by length. If the terminal misses certain data, the base station may not know what data the terminal has sent feedback on, so the payload size of the feedback on the data transmitted in other transmission time intervals is fixed and the position of the feedback. By fixing the above problem can be solved.
- FIG. 12 is a diagram illustrating a procedure of a base station and a terminal for the method described with reference to FIG. 11.
- the base station transmits transmission time interval setting information to the terminal.
- the transmission time interval setting information includes common transmission time interval and dedicated transmission time interval related information as described in (a) of FIG. 7 and the configuration information includes a higher layer signal including a system signal and / or an RRC signal. Or it is transmitted to the terminal through a physical signal.
- the subframe structure may be predetermined for a predetermined time and transmitted to the UE through an upper layer signal or a physical signal including a system signal and / or an RRC signal.
- the base station transmits control information and data including data scheduling information for 5G service to the terminal.
- the control information may include a subframe structure according to a common transmission time interval, and the control information may be a subframe structure for a current common transmission time interval or a next common transmission time interval.
- the control information may be transmitted in the first symbol of the subframe.
- the data scheduling information includes all scheduling information for a service considered for 5G as described in the present invention, and the scheduling information includes information indicating a frequency resource or a time resource for data transmission of the 5G service.
- the data scheduling information may be transmitted by a higher layer signal or a physical signal.
- the base station transmits and receives data according to the subframe structure indicated by the control information.
- step 1220 the base station receives feedback on the data transmitted in step 1210. Feedback reception follows the method described with reference to FIG. 11.
- the terminal receives the transmission time interval setting information from the base station.
- the transmission time interval setting information includes common transmission time interval and dedicated transmission time interval related information as described in (a) of FIG. 7 and the configuration information includes a higher layer signal including a system signal and / or an RRC signal, or It is transmitted to the terminal through a physical signal.
- the subframe structure may be predetermined for a predetermined time and transmitted to the UE through an upper layer signal or a physical signal including a system signal and / or an RRC signal.
- the terminal receives control information and data including data scheduling information for 5G service from the base station.
- the control information may include a subframe structure according to a common transmission time interval, and the control information may be a subframe structure for a current common transmission time interval or a next common transmission time interval.
- the control information may be transmitted in the first symbol of the subframe.
- the data scheduling information includes all scheduling information for a service considered for 5G as described in the present invention, and the scheduling information includes information indicating a frequency resource or a time resource for data transmission of the 5G service.
- the data scheduling information may be transmitted by a higher layer signal or a physical signal.
- the terminal transmits and receives data according to the subframe structure of the control information.
- step 1270 the terminal transmits feedback on the data received in step 1260. Feedback transmission follows the method described with reference to FIG. 11.
- FIG. 13 is a diagram illustrating a base station apparatus according to the present invention.
- the controller 1300 is a subframe structure according to FIG. 5 of the present invention, and the embodiments 1-1, 1-2, and 1-3 of the present invention according to FIGS. 7, 9, and 11.
- the control information and data are transmitted to the terminal through the 5G resource information transmission device 1320, and the scheduler 1310 schedules 5G data in 5G resources.
- the 5G data transceiver 1330 transmits and receives 5G data with the 5G terminal.
- FIG. 14 is a diagram illustrating a terminal device according to the present invention.
- a terminal device includes a subframe structure according to FIG. 5 of the present invention, and terminals according to embodiments 1-1, 1-2, and 1-3 of the present invention according to FIGS. 7, 9, and 11.
- control information and data are received from the base station through the 5G resource information receiving device 1410, and the controller 1400 transmits 5G data scheduled in the allocated 5G resources to the 5G base station through the 5G data transmitting and receiving device 1420.
- the present invention relates to a general wireless mobile communication system, and more particularly, to a reference signal in a wireless mobile communication system using a multiple access scheme using a multi-carrier such as an orthogonal frequency division multiple access (OFDMA). Signal).
- OFDMA orthogonal frequency division multiple access
- the current mobile communication system has evolved from providing a voice-oriented service to a high speed, high quality wireless packet data communication system for providing a data service and a multimedia service.
- various standardization organizations such as 3GPP, 3GPP2, and IEEE are working on the 3rd generation evolutionary mobile communication system standardization using the multi-access method using multiple carriers.
- various mobile communication standards such as Long Term Evolution (LTE) of 3GPP, Ultra Mobile Broadband (UMB) of 3GPP2, and 802.16m of IEEE provide high-speed, high-quality wireless packet data transmission service based on multiple access method using multi-carrier. It was developed to support.
- LTE Long Term Evolution
- UMB Ultra Mobile Broadband
- 802.16m 802.16m
- MIMO Multiple Input Multiple Output
- AMC adaptive modulation and coding
- eNB evolved Node B
- BS Base Station
- UE User Equipment
- MS Mobile Station
- CSI-RS channel state information reference signal
- the aforementioned eNB refers to a downlink transmission and uplink receiving apparatus located at a predetermined place, and one eNB performs transmission and reception for a plurality of cells.
- a plurality of eNBs are geographically distributed, and each eNB performs transmission and reception for a plurality of cells.
- LTE and LTE-Advanced utilize MIMO technology for transmitting signals using a plurality of transmit / receive antennas to increase data rate and system capacity.
- MIMO technology Using the MIMO technology, a plurality of information streams are spatially separated and transmitted by utilizing a plurality of transmit / receive antennas.
- spatially separating and transmitting a plurality of information streams is called spatial multiplexing.
- the number of information streams to which spatial multiplexing can be applied depends on the number of antennas of the transmitter and the receiver. In general, the number of information streams to which spatial multiplexing can be applied is called the rank of the transmission.
- MIMO technology supported by the LTE-A Release 11 standard supports spatial multiplexing for 16 transmit antennas and 8 receive antennas, and a rank of up to 8 is supported.
- NR New Radio Access Technology
- eMBB Mobile BroadBand
- mMTC Massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communications
- each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
- Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
- Each block may also represent a module, segment or portion of code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of order. For example, the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
- ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
- ' ⁇ ' is not meant to be limited to software or hardware.
- ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
- ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
- the functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
- the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- FIG. 15 is a diagram illustrating radio resources of one subframe and one resource block (RB), which are minimum units of downlink scheduling in LTE and LTE-A systems.
- the radio resource shown in FIG. 15 consists of one subframe on the time axis and one RB on the frequency axis.
- the radio resource is composed of 12 subcarriers (or subcarriers) in the frequency domain and 14 OFDM symbols in the time domain, and thus includes a total of 168 natural frequencies and time positions.
- each of the natural frequency and the time position of FIG. 15 is referred to as a resource element (RE).
- a plurality of different types of signals may be transmitted to the radio resource illustrated in FIG. 15 as follows.
- CRS Cell Specific Reference Signal
- DMRS Demodulation Reference Signal
- This is a reference signal transmitted for a specific UE and is transmitted only when data is transmitted to the UE.
- DMRS may be composed of a total of eight DMRS antenna ports (antenna ports).
- antenna ports 7 through 14 correspond to DMRS antenna ports, and antenna ports interfere with each other using code division multiplexing (CDM) or frequency division multiplexing (FDM). Maintain orthogonality to avoid
- PDSCH Physical Downlink Shared Channel, 1520: This is a downlink data channel, which is used by a base station to transmit traffic to a user equipment, and is transmitted by using an RE which does not transmit a reference signal in the data region of FIG.
- CSI-RS 1540 A reference signal transmitted for UEs belonging to one cell and used to measure a channel state. A plurality of CSI-RSs may be transmitted in one cell.
- Control Channels Physical Hybrid-ARQ Indicator Channel (PHICH), Physical Control Format Indicator Channel (PCFICH), Physical Downlink Control Channel (PDCCH), 1530
- PHICH Physical Hybrid-ARQ Indicator Channel
- PCFICH Physical Control Format Indicator Channel
- PDCCH Physical Downlink Control Channel 1530
- ACK / NACK positive acknowledgment or negative acknowledgment information
- HARQ hybrid ARQ
- muting may be set so that CSI-RSs transmitted from other base stations can be received without interference from terminals of corresponding cells.
- the muting may be applied at a location where the CSI-RS can be transmitted, and in general, the terminal receives a traffic signal by skipping a corresponding radio resource.
- Muting in LTE-A system is another term also referred to as zero-power CSI-RS (zero-power CSI-RS). This is because the nature of the muting is applied to the position of the CSI-RS and there is no transmission power.
- the CSI-RS may be transmitted using a part of positions indicated as A, B, C, D, E, E, F, G, H, I, and J according to the number of antennas transmitting the CSI-RS. Can be. Muting may also be applied to some of the positions indicated by A, B, C, D, E, E, F, G, H, I and J.
- the CSI-RS may be transmitted on 2, 4, and 8 REs according to the number of antenna ports transmitted. If the number of antenna ports is two, the CSI-RS is transmitted in half of the specific pattern in FIG. 15, if the number of antenna ports is four, the CSI-RS is transmitted in the entirety of the specific pattern and the two patterns in the case of eight antenna ports Using the CSI-RS is transmitted.
- Muting on the other hand, always consists of one pattern unit. That is, the muting may be applied to a plurality of patterns, but may not be applied to only part of one pattern when the position does not overlap with the CSI-RS. However, it can be applied to only part of one pattern only when the position of CSI-RS and the position of muting overlap.
- the CSI-RSs for two antenna ports When the CSI-RSs for two antenna ports are transmitted, signals of each antenna port are transmitted from two REs connected on a time axis, and signals of each antenna port are divided into orthogonal codes.
- signals for the two antenna ports added in the same manner are transmitted by using two REs in addition to the CSI-RSs for the two antenna ports.
- CSI-RSs for eight antenna ports are transmitted. In the case of CSI-RS supporting 12 and 16 antenna ports, the transmission resources are reduced by combining three CSI-RS transmission positions for the existing four antenna ports or two CSI-RS transmission positions for the eight antenna ports. Is done.
- the terminal may be allocated channel state information-interference measurement or interference measurement resources (IMR) with the CSI-RS from the base station, and the resources of the CSI-IM are the same as the CSI-RS supporting four antenna ports. It has a resource structure and location.
- IMR interference measurement or interference measurement resources
- the base station configures the CSI-RS and two CSI-IM resources, and in one CSI-IM, the neighboring base station is always In order to transmit a signal and the other CSI-IM, the neighboring base station does not always transmit the signal so that the amount of interference of the neighboring base station can be effectively measured.
- Table 2 below shows the RRC fields configuring the CSI-RS configuration. This includes the contents of the RRC configuration to support periodic CSI-RS in the CSI process.
- Channel status reporting based on the periodic CSI-RS in the CSI process can be classified into four types as shown in Table 2 above.
- CSI-RS config is for setting the frequency and time position of the CSI-RS RE.
- the number of antenna ports of the corresponding CSI-RS is set by setting the number of antennas.
- Resource config sets the RE position in the RB
- subframe config sets the period and offset of the subframe in which the CSI-RS is transmitted.
- Table 3 is a table for Resource config configuration currently supported by LTE
- Table 4 is a table for Subframe config configuration.
- the terminal may check the frequency and time position and the period and offset in which the CSI-RS is set through Tables 3 and 4 above.
- Qcl-CRS-info sets quasi co-location information for CoMP.
- the CSI-IM config is for setting the frequency and time position of the CSI-IM for measuring interference. Since the CSI-IM is always set based on four antenna ports, the number of antenna ports is not required.
- the resource config and the subframe config are configured in the same manner as the CSI-RS.
- the CQI report config is information for configuring how to report channel status using a corresponding CSI process. These settings include periodic channel status reporting and aperiodic channel status reporting, precoding matrix indicator (PMI) and rank indicator (RI) reporting settings, and RI reference CSI process settings. , Subframe pattern setting, and the like.
- the subframe pattern is for setting a measurement subframe subset for supporting channel and interference measurement having different characteristics in time in channel and interference measurement received by the UE.
- the measurement subframe subset was first introduced in the eICIC (enhanced Inter-Cell Interference Coordination) to estimate the channel state by reflecting other interference characteristics of Almost Blank Subframe (ABS) and a general subframe other than ABS. Subsequently, two IMRs are measured to measure different channel characteristics between subframes that can be dynamically switched from downlink to subframes that are always operated in downlink in enhanced Interference Mitigation and Traffic Adaptation (eIMTA). It has evolved into an improved form that enables it. Tables 5 and 6 show subsets of measurement subframes for eICIC and eIMTA support, respectively.
- the eICIC measurement subframe subset supported by LTE is set using csi-MeasSubframeSet1-r10 and csi-MeasSubframeSet2-r10. MeasSubframePattern-r10 referenced by this field is shown in Table 7 below.
- MSB on the left side indicates subframe # 0.
- the eIMTA measurement subframe subset uses one field to indicate that 0 belongs to the first subframe set and 1 is The subframe belongs to the second subframe set. Therefore, in eICIC, a corresponding subframe may not be included in two subframe sets, but in the case of an eIMTA subframe set, there is a difference that one of two subframe sets should always be included.
- Such a terminal is needed to generate the CSI reported power ratio between the PDSCH and a CSI-RS RE codebook subset restriction to set whether or not to so that the P C and any codebook means (power ratio) using (Codebook subset restriction)
- the P C and codebook subset restrictions are set by the pC-AndCBSRList field of Table 8, which includes two PC-AndCBSR fields of Table 9 in the form of a list, and each field means a setting for each subframe subset.
- the P C may be defined as Equation 1 below and may indicate a value between -8 and 15 dB.
- the base station can adjust the CSI-RS transmission power for a variety of purposes, such as improving the channel estimation accuracy in the variable, and the terminal is much lower or higher used in the transmit power used for the data transmission channel estimation via a notification P C transmit power compared to I can see.
- the terminal may calculate and report an accurate channel quality indicator (CQI) to the base station.
- CQI channel quality indicator
- the codebook subset limitation is a function that allows the base station to configure the terminal not to report to the base station codepoints of codebooks supported by the standard according to the number of CRS or CSI-RS antenna ports.
- This codebook subset restriction can be set by the codebookSubsetRestriction field included in AntennaInfoDedicated of Table 10 below.
- the codebookSubsetRestriction field consists of a bitmap and the size of the bitmap is the same as the number of codepoints of the corresponding codebook. Therefore, each bitmap represents each code point. If the corresponding value is 1, the terminal may report the corresponding code point to the base station through the PMI. If the bitmap value is 0, the corresponding code point may not be reported to the base station as the PMI.
- the MSB has a high precoder index and the LSB has a low precoder index (eg, 0).
- a base station In a cellular communication system, a base station must transmit a reference signal to a terminal in order to measure a downlink channel state.
- the terminal measures the channel state between the base station and itself using the CRS or CSI-RS transmitted by the base station.
- the channel state basically needs to consider several factors, including the amount of interference in the downlink.
- the amount of interference in the downlink includes an interference signal generated by an antenna belonging to an adjacent base station and thermal noise, and is important for the terminal to determine the downlink channel condition.
- a base station having a single transmitting antenna transmits a signal to a terminal having a single receiving antenna
- the terminal simultaneously uses the reference signal received from the base station and the energy per symbol that can be received in downlink and a section for receiving the corresponding symbol simultaneously.
- the amount of interference to be received must be determined and Es / Io (interference amount to energy ratio per symbol) must be determined.
- the determined Es / Io is converted to a data transmission rate or a corresponding value and notified to the base station in the form of a CQI, so that the base station can determine at which data transmission rate to perform transmission to the terminal in downlink.
- the terminal feeds back information on the channel state of the downlink to the base station so that the terminal can utilize the downlink scheduling of the base station. That is, the terminal measures the reference signal transmitted by the base station in downlink and feeds back the extracted information to the base station in the form defined in the LTE and LTE-A standards.
- the information fed back by the terminal in LTE and LTE-A can be classified into the following three.
- Rank indicator (RI): The number of spatial layers that the terminal can receive in the current channel state.
- PMI Precoding Matrix Indicator
- CQI Channel Quality Indicator
- the RI, PMI and CQI are associated with each other and have meaning.
- the PMI value when the RI has a value of 1 and the PMI value when the RI has a value of 2 are interpreted differently even if the value is the same.
- the UE determines the CQI it is assumed that the rank value and the PMI value informed by the UE of the base station have been applied.
- the terminal when the terminal informs the base station of RI_X, PMI_Y and CQI_Z, it means that the terminal may receive data according to the data rate corresponding to CQI_Z when the rank is RI_X and the applied precoding matrix is PMI_Y.
- the UE assumes which transmission scheme is to be performed to the base station when calculating the CQI so that the optimized performance can be obtained when the actual transmission is performed in the corresponding transmission scheme.
- FIG. 16 is a diagram illustrating an example in which data such as eMBB, URLLC, and mMTC, which are services considered in an NR system, are allocated in a frequency-time resource together with a Forward Compatiable Resource (FCR).
- FCR Forward Compatiable Resource
- URLLC data is transmitted while the eMBB and mMTC are previously allocated.
- URLLC data may be allocated and transmitted to a portion of a resource to which an eMBB is allocated, and the eMBB resource may be known to the terminal in advance.
- eMBB data may not be transmitted in a frequency-time resource where eMBB data and URLLC data overlap, and thus transmission performance of eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.
- the length of a transmission time interval (TTI) used for URLLC transmission may be shorter than the length of TTI used for eMBB or mMTC transmission.
- TTI transmission time interval
- FIG. 17 is a diagram illustrating a case where each service is multiplexed in time-frequency resources in an NR system.
- the base station may allocate the CSI-RS to all bands or a plurality of bands to secure initial channel state information, such as 1700, to the terminal.
- initial channel state information such as 1700
- CSI-RS full-band or multi-band wideband CSI-RS
- Such full-band or multi-band wideband CSI-RS generates a large amount of reference signal overhead, which may be disadvantageous in optimizing system performance, but in the absence of prior channel state information, such full-band or multi-band CSI-RS may be necessary.
- each service may be provided with a different requirement for each service, and accordingly, the accuracy and update need of channel state information required may also vary. Accordingly, after the base station secures the initial channel state information, the base station may trigger subband CSI-RSs (1710, 1720, 1730) for each service in a corresponding band according to a need for each service.
- the CSI-RS for one service is transmitted at one time. However, CSI-RS for a plurality of services may be transmitted as needed.
- the service of the corresponding band may also vary according to the change of time and frequency resources of the base station, and various channel and interference conditions should be considered in consideration of this.
- FIG. 18 is a diagram illustrating a service of an interfering cell according to a change in time-frequency resources from the eMBB perspective, and a change in interference situation accordingly.
- one rectangle means a vertical resource group (VRG), which is a basic unit of time-frequency resources set by a base station to a user equipment.
- VRG vertical resource group
- all of the VRG resources of the first cell 1800 are set to eMBB.
- another cell (second cell) 1810 may operate each VRG resource as an eMBB, FCR, URLLC candidate resource, or the like.
- a signal transmission method may vary according to a need of a service, and thus, characteristics of interference affecting the first cell may vary.
- the terminal occupies the resource preferentially when the URLLC should be transmitted. Therefore, in the corresponding VRG of the first cell, the change in the frequency band may be relatively small compared to the VRG in which the eMBB acts as an interference, and thus, the interference prediction of the base station may be relatively easy.
- the service of the interference resource is not included in FIG. 18, since a relatively low power terminal repeatedly transmits a signal to improve coverage, the interference resource may have a smaller amount of interference than the service of the URLLC. It may be advantageous to the data transmission of the terminal relatively.
- 19 illustrates an example of a base station transmitting a CSI-RS in order to measure and report channel state information effectively in an NR system.
- the optimal beam direction may vary for each frequency band, and accordingly, it may be effective to transmit different analog and digital beams for each frequency band.
- Analog beams cannot transmit different signals for different frequency bands due to hardware limitations.However, for digital beams, it is sufficient to vary the phase of the signal, so the base station can transmit different beams for different frequency bands as shown in 1900 and 1910.
- the CSI-RS can be transmitted based on this.
- the CSI-RS may be transmitted from transmission reception points (TRPs) located in different geographical locations as well as other beam directions.
- TRPs transmission reception points
- the CSI-RS of the existing LTE system is designed on the assumption that the same signal is transmitted in all bands. As described above, in order to apply different services, beams, or CoMP scenarios to different time-frequency resources, different CSI-RSs may be applied. There is a need for an RS transmission / reception method and channel state information feedback method.
- An eMBB, URLLC or mMTC resource for each service and a resource for supporting channel state measurement and reporting on other beam and CoMP scenarios may be one physical resource block (PRB) or a plurality of PRB units.
- the plurality of PRB units may include a service group (SG), a service resource group (SGG), a vertical group (VG), a vertical resource group (VRG), a frequency resource block group (FRG), a physical resource block group (RGG), and an MPG (MPG). Multiple PRB group).
- the resource since the setting may be considered not only frequency but also time and frequency resources at the same time, the resource may be referred to as a TFRG (Time and Frequency Resource Block Group).
- the description is based on VRG, but the VRG in the following description may be replaced with all terms and similar terms mentioned above.
- the VRG resource setting unit mentioned above should be designated according to time and frequency resources.
- the unit of time resource may be defined as a value in the standard or may be set through RRC signaling. If the unit of time resource is defined as one value in the standard, the service transformation unit of a plurality of cells may be set to one value. Will match. Therefore, the terminal and the base station can relatively easily predict the change of the interference.
- the base station does not need frequent service conversion in the time resource
- the unit of time resource is defined as one small time unit (for example, one slot or subframe)
- unnecessary configuration overhead may be increased.
- the time resource unit is a large time unit (for example, tens of ms, etc.)
- the service cannot be flexibly switched from the time resource according to the needs of the base station. May not be satisfied. Therefore, in consideration of this, the corresponding time resource unit should be determined.
- the time resource unit can be set through RRC signaling
- a plurality of base stations or TRPs can freely convert the corresponding time service unit, and accordingly, the base station and the terminal can freely set the corresponding time unit according to the requirements of the corresponding system. Can be used.
- the terminal implementation is complicated to satisfy this, and from the viewpoint of the terminal, another cell may also change the time unit according to the request of the service, thereby making prediction of interference relatively difficult. Therefore, it is desirable to limit the settable time unit to specific values only.
- Table 11 illustrates a service unit designation field at the time for such a VRG configuration.
- the base station may set the size of the corresponding time resource to one of 5ms, 10ms, 20ms, and 40ms, and the terminal may determine the size and number of the VRG time resources and operate accordingly.
- the number of time units that can be set by the base station to the terminal may be changed.
- the number is set in ms units, but the corresponding unit may be various units such as TTI or subframe.
- the direct number is set, but it is also possible to indirectly set the type A, the type B, etc., not the direct number. In this case, such a time unit may be included in the type setting.
- the size of the VRG in the frequency axis may be defined as a value in the standard or may be set through RRC signaling. If the frequency size is defined as one value in the standard, since the service conversion unit can be set to one value on the frequency axis for a plurality of cells, the interference of the signal of the base station transmitting data is also identical. Done. Therefore, the terminal and the base station can relatively easily predict the change of the interference. However, when the base station does not need frequent service conversion in the frequency resource, if the frequency resource unit is defined as one small frequency unit (for example, one PRB), unnecessary configuration overhead may be increased.
- the service may not be flexibly switched in time resources according to the needs of the base station in the case of a large frequency resource unit (for example, a few tens PRBs). This may not be satisfied. Therefore, in consideration of this, the corresponding frequency resource unit should be determined.
- a large frequency resource unit for example, a few tens PRBs
- the effective frequency resource unit may vary depending on the size of the system band.
- the system band is relatively small, it is important to divide the frequency band into smaller pieces and efficiently multiplex the corresponding bands.However, if the system band is sufficient, the frequency band is divided into large portions rather than dividing the frequency band into smaller pieces to increase the set-up overhead. It may be desirable to use.
- This method may be applied to a system band or a bandwidth part, and the bandwidth part means a part of the entire system band that can be used by a specific terminal.
- Table 12 below shows an example of changing the VRG size in the frequency band according to the size of the system band by exemplifying the corresponding frequency resource as VRG. In the table below, the system band can be understood as part of the bandwidth.
- the size of the VRG is changed according to the set system band, and based on the VRG having the service unit of the frequency band, the base station provides a terminal with different services or verticals (vertical, which refers to services supported by 5G systems). It can be understood to support).
- Table 12 illustrates that the VRG size varies according to the system band setting, and the direct number of the system band range and the VRG size in the table may vary.
- the frequency unit may also be configured to configure the VRG service unit through RRC signaling.
- a plurality of base stations or TRPs may freely convert corresponding frequency service units, and accordingly, the base station and the terminal may freely set and use the corresponding frequency units according to the requirements of the corresponding system.
- the terminal implementation is complicated to satisfy this, and from the viewpoint of the terminal, another cell may also change the frequency service unit according to the request of the service, and thus interference prediction may be relatively difficult. Therefore, it is desirable to limit the settable frequency unit to specific values only. Table 13 below illustrates a service unit designation field in the frequency axis for such a VRG configuration.
- the base station may set the size of the corresponding time resource to one of 5 PRBs, 10 PRBs, 20 PRBs, and 40 PRBs, and the terminal may determine the size and number of VRG time resources based on this and operate accordingly.
- the number of time units that can be set by the base station to the terminal may be changed.
- the number is set in units of PRBs, but the unit may be various units such as a resource block group (RBG) or a subband. have.
- RBG resource block group
- the direct number is set, but it is also possible to indirectly set the type A, the type B, and the like, instead of the direct number.
- the indirect setting may include not only a frequency unit but also a time unit.
- the number of VRGs supported by the corresponding system may be calculated based on the time and frequency resource sizes of the above-mentioned VRGs, which may be expressed by Equation 2 below.
- the VRG number is expressed by dividing the number of subframes in one frame unit by the subframes in the VRG time unit, but the subframe, which is a corresponding unit, may be expressed in various units such as ms or TTI.
- the number of VRGs in frequency is also expressed by dividing the system band represented by the PRB number by the PRB number which is a VRG unit in frequency, but the corresponding PRB may be represented by various numbers such as RBG or subband.
- the number of VRGs in a time band is one, the number of corresponding VRG resources may be represented only by the number of VRGs on the frequency resource.
- the UE may directly or indirectly configure a service or vertical configuration corresponding to the VRG to the UE based on the calculated VRG number.
- the configuration may be performed by providing configuration fields to all VRG resources individually or by dividing configuration fields by time and frequency. Table 14 below is an example of providing configuration fields to all VRG resources individually.
- the size of the bitmap for setting the service type of the VRG resource may be calculated by multiplying the number of bits that can be set for each VRG by the number of VRGs that can be calculated in Equation 2 above.
- This method has the advantage of setting the service or vertical for all possible combinations because the VRG type can be set for each VRG configuration.
- a large size bitmap is required for the configuration and the configuration overhead increases accordingly.
- CA carrier aggregation
- the above method is illustrated on the assumption that the corresponding bitmap sets all the VRGs of the system at one time. However, such a setting field may be provided separately for each VRG.
- service type setting of the VRG resource may be separately performed for each VRG resource for each resource.
- it may be set separately for each VRG of a time unit and a VRG of a frequency unit.
- Table 15 below is an example of providing a setting field for each time and frequency.
- each field represents a setting field for a VRG resource for each time and frequency. This can reduce the overhead of VRG configuration. For example, if there are 10 VRG resources for each time and frequency, if there is a configuration field for all VRG resources, assuming that the configuration field is 2 bits, 200 bits of overhead are required. However, if it is set by dividing by time and resources and setting 1 bit for time resources and 2 bits for frequency resources, 10 bits and 20 bits are required, respectively, and thus a total of 30 bits may be set.
- the corresponding time or frequency resources may allow one resource setting to indicate whether to allow setting of other resources.
- Table 16 below shows these 1-bit settings.
- the one bit indicates whether the corresponding time resource is a resource that can be set to various services. If the resource is not configurable at that time, the resource can be attributed to a specific service, such as eMBB, and these services are equivalent to eMBB or eMBB if they are not configurable to the standard. It can be expressed as assuming a value. In addition, it is also possible to inform the terminal by selecting one of 'eMBB', 'mMTC' or 'eMBMS' through the RRC field as a basic service for the non-configurable time resource.
- the time resource can be set by using the table or not set by using the table, and the individual service is set by the frequency resource. It is also possible to set up individual services for In addition, in the above example, 'not configurable' is described, but the description of the corresponding field is described as 'eMBB', 'mMTC' or 'eMBMS', and if configurable, the value of the corresponding detailed setting may be followed. It is possible.
- Tables 17 and 18 below illustrate fields for directly configuring VRG service or vertical according to a VRG configuration field having a 2-bit or 3-bit size.
- the service type can be directly set for each VRG using a predetermined table.
- Such a setting method may be used in all of the above-mentioned VRG setting fields or VRG setting fields divided and set according to time and frequency resources.
- the corresponding service type can be notified in more detail, and the service can be needed in the future by using the 'reserved' field. You can also reserve this field.
- the increase of the indication information increases the corresponding configuration overhead, it should be determined by judging the utility of the service configuration compared to the increase of overhead.
- a plurality of types may be supported for one service.
- a UE may be configured with different types for two or more MBSFN areas.
- MCS modulation and coding scheme of the corresponding area
- the base station may be configured to support different settings of the same service through the plurality of settings.
- URLLC has different requirements for operation compared to eMBB.
- eMBB operates at a block error rate (BLER) of 10%
- URLLC may require a high reliability, such as 1x10 -5 , due to its characteristics, and thus can operate at an error probability of 10 -5 .
- the current CQI of the LTE system is not suitable for link adaptation (link adaptation) for the URLLC operation because the terminal is to report the MCS that can operate at 10% BLER to the base station. Therefore, when the VRG is configured for the URLLC service, the UE may report information such as CQI or MCS and coding rate corresponding to the service to the base station.
- CSI for URLLC may support CQI tables that support lower modulation orders and coding rates.
- Tables 19, 20, and 21 are CQI tables for 64QAM-based data transmission, CQI tables for 256QAM-based data transmission, and CQI tables for NB-IOT support in LTE-A systems.
- Tables 19, 20 and 21 above can be used as examples of intermediate data rates, high data rates and data rates for low data rates or high reliability, respectively. Therefore, in the case of channel state information set to eMBB or used for eMBB, all of the plurality of CQI tables may be set. However, in the case of channel state information used for URLLC, when considering the high reliability required by URLLC, it may not be necessary to consider a high modulation order or a coding rate. Accordingly, channel state information for URLLC may be set only in a CQI table (ie, a table supporting a maximum of 64QAM or 16QAM) that supports a medium or low data rate to the maximum among the plurality of CQI tables.
- a CQI table ie, a table supporting a maximum of 64QAM or 16QAM
- a high reliability MCS may be configured in the terminal.
- the MCS can be instructed by the base station to the terminal, and a high reliability MCS table can be newly defined for this purpose.
- a CQI table to be used directly can be set through independent RRC field setting.
- Method 2 of setting a high reliability CQI table may be indirectly configured through an RRC field setting configured with a high reliability CQI.
- a CQI table to be used directly may be set through independent downlink control information (DCI) field setting.
- DCI downlink control information
- Method 4 of setting high reliability CQI table may be indirectly set through DCI field setting which is set together with high reliability CQI.
- Method 1 of setting a CQI table is a method of setting a CQI table to be used directly through setting of an independent RRC field.
- the CQI considering the high reliability mentioned above may be set based on a configuration field independent of the MCS configuration.
- This method has an advantage that the base station can freely set the CQI table required for the corresponding URLLC transmission according to the implementation.
- this method allows the terminal to report the channel status report based on different CQI tables according to the terminal for URLLC transmission.
- the CQI table configuration method 2 is a method of indirectly configuring the RQ field through which a high reliability CQI and an MCS are set together.
- URLLC requires CQI indicating high reliability with low modulation order and coding rate application. Therefore, if the high reliability MCS and the high reliability CQI are divided and set, the overhead for setting can be increased, so that both can be set at the same time. That is, when the RRC field is set, it can be understood that both a high reliability MCS table and a high reliability CQI are set.
- the corresponding CQI table may have only one CQI table defined in advance in a plurality of tables.
- CQI table configuration method 3 is a method of configuring a CQI table to be used directly through independent DCI field configuration.
- the CQI considering the high reliability mentioned above may be set based on a configuration field independent of the MCS configuration.
- This method has an advantage that the base station can freely set the CQI table required for the corresponding URLLC transmission according to the implementation.
- the base station may dynamically change the eMBB and URLLC as needed, or dynamically change the target data rate of the eMBB and allow the terminal to report channel state information.
- CQI table configuration method 4 is indirectly configured through DCI configuration in which a high reliability CQI and MCS are configured together.
- URLLC requires CQI that indicates high reliability with low modulation order and coding rate. Therefore, if the high reliability MCS and the high reliability CQI are separately set, the overhead for setting may increase. So you can set them up at the same time. That is, when the information indicating the use of the high reliability CQI is included in the DCI, it can be understood that both the high reliability MCS table and the high reliability CQI are set.
- the base station may dynamically change the eMBB and URLLC as necessary, or dynamically change the target data rate of the eMBB, and allow the terminal to report channel state information.
- the corresponding CQI table may support only one CQI table previously defined in the standard among a plurality of tables.
- the CQI table supporting the high data rate supports up to 256QAM, but in addition, 1024QAM may be supported.
- the above example illustrates a case in which a CQI table for providing high reliability supports up to 16 QAM, but may support only a lower modulation order, for example, QPSK.
- a rank allowed for reporting may be limited.
- data transmission based on high rank is difficult to guarantee high reliability. Therefore, the amount of information required for channel state information reporting can be reduced by limiting the rank used for channel state information reporting for URLLC.
- RI limit setting method 1 for URLLC is a method of directly setting a limit through independent RRC field setting.
- RI limit setting method 2 for URLLC is a method of indirectly setting a limit by setting an RRC field configured with a high reliability CQI.
- RI limit setting method 3 for URLLC is a method of directly setting a limit through codebook subset restriction RRC field setting.
- RI limit setting method 4 for URLLC is a method of directly setting rank limit through independent DCI field setting.
- RI limit setting method 5 for URLLC is a method of indirectly setting a limit by setting a DCI field configured with a high reliability CQI.
- RI limit setting method 1 for URLLC is a method of directly setting RI limit through independent RRC field setting.
- the RI restriction may be set based on a configuration field independent of the CQI and CQI table configuration considering the high reliability mentioned above. This method has an advantage that the base station can freely set an RI restriction for the corresponding URLLC transmission according to the implementation.
- RI limit setting method 2 for URLLC is a method of indirectly setting an RI limit by setting an RRC field that sets a high reliability CQI and CQI table and an RI limit together.
- URLLC may require high reliability CQI and RI constraints simultaneously with low modulation order and coding rate. Therefore, setting the two separately may increase the overhead for setting.
- the UE can support channel state information reporting for URLLC by enabling simultaneous simultaneous configuration of high reliability CQI and RI restrictions. In such cases, that RI restriction may support only one of the RIs previously defined in the standard, for example 2 or 3. That is, the terminal may feed back up to two or three RIs to the base station.
- RI limit setting method 3 for URLLC is a method of indirectly setting an RI limit by setting a codebook subset limit RRC field. That is, the PMI and RI restriction settings may be supported by using the same method as the eMBB service by setting all the PMIs according to the RIs not to be fed back.
- RI limit setting method 4 for URLLC is a method of directly setting RI limit through independent DCI field setting.
- the RI restriction may be set based on the configuration field independent of the CQI considering the high reliability mentioned above.
- This method has an advantage that the base station can freely set the CQI table required for the corresponding URLLC transmission according to the implementation.
- the base station may dynamically change the eMBB and URLLC as needed, or dynamically change the target data rate of the eMBB and allow the terminal to report channel state information.
- RI limit setting method 5 for URLLC is a method of indirectly setting an RI limit through a DCI field setting which sets a high reliability CQI and CQI table and RI limit together.
- URLLC may require high reliability CQI and RI constraints simultaneously with low modulation order and coding rate. Therefore, setting the two separately may increase the overhead for setting.
- the UE can support channel state information reporting for URLLC by enabling simultaneous simultaneous configuration of high reliability CQI and RI restrictions.
- the base station may dynamically change the eMBB and URLLC as necessary, or dynamically change the target data rate of the eMBB, and allow the terminal to report channel state information.
- that RI restriction may support only one of the RIs previously defined in the standard, for example 2 or 3.
- a separate transport block size (TBS) table for supporting URLLC transmission may be supported.
- the UE may receive a modulation order and a coding rate for data transmission together with the data scheduling resource information, and the MCS information may be used for the UE to obtain TBS size information necessary for decoding of downlink data transmission.
- the TBS table may be configured independently through DCI or RRC configuration, and may be set together with the above-described CQI, CQI table, MCS table, or RI restriction configuration for URLLC transmission with high reliability.
- a transmission scheme for transmitting the corresponding URLLC data may be limited.
- a diversity-based transmission scheme for example, transmission diversity or a large delay CDD (rather than a spatial multiplexing-based transmission scheme), is required.
- CDD Cyclic Delay Diversity
- precoder cycling or semi-open-loop or beam-based diversity transmission techniques may be advantageous.
- TBS configuration such a transmission scheme may be independently configured through DCI or RRC configuration, and the CQI, CQI table, MCS table, RI restriction setting, or TBS table configuration for URLLC transmission with high reliability described above. Can be set together.
- the above mentioned methods can also be used for other services.
- CQI with high reliability is not required, but low CQI table and MCS setting, TBS table setting, RI restriction setting, and transmission scheme restriction may be required. Therefore, in order to support the scheme for these terminals, the table is a CQI, CQI table, MCS table having a higher transmission rate, an intermediate transmission rate, a lower transmission rate, a higher reliability, an intermediate reliability, and a lower reliability than the URLLC-dedicated CQI table or the mMTC CQI table. , TBS table, and so on.
- alternative CQI alternative CQI table
- alternative MCS table alternative TBS table
- channel state information reporting may not be performed.
- eMBMS is a service specialized for broadcasting and does not use link adaptation and should allow all terminals in the area to receive the data. Therefore, the terminal with the lowest SINR uses MCS suitable for the terminal to receive data.
- channel state information reporting may not be required for the corresponding band. If the channel state information reporting is not performed according to the service configuration, information such as RI, PMI and CQI may be excluded from the information transmission or fixed to a specific bit such as 0.
- the amount of channel state information transmitted in the uplink can be minimized to improve coverage and transmission performance where the information can be transmitted and to improve system performance.
- the direct service setting method as described above has an advantage of transmitting control signals, data, and channel state information in a method optimized for the corresponding service as described above, and accordingly, the system can be efficiently used. However, it may be necessary to reserve a large number of fields assuming that a new service will be introduced later for the NR system, so a sufficient number of reserved fields should be secured. However, in this case, the overhead of setting the corresponding field may be excessively increased.
- Table 17 and Table 18 above are examples of direct service type setting for the VRG, and values and services of the corresponding corresponding fields may be different. In the above table, a field using 2 bits and 3 bits is illustrated, but the number of bits in the actual field may be different from the above table.
- Table 22 below shows the configuration of an indirect VRG set through a 2-bit VRG configuration field.
- the method of Table 22 is a method of designating and using an indirect service set.
- the base station does not need to support all service types, and only a few services can be used as needed.
- all the base stations should use the configuration bit according to all service types, which increases the configuration overhead. Therefore, when informed in the form of an indirect service set as described above, the configuration overhead can be minimized, and the base station can enjoy the corresponding VRG effect by grouping and managing the VRGs in sets.
- an additional setting for designating a service corresponding to each service set is required. For example, if the fields mentioned in Table 17 or Table 18 are set for each service set, the service type can be directly set for each service set without having to support the entire field for every VRG, and the configuration overhead can be minimized by using this. .
- the channel state information specific to a service such as URLLC may be set by using the additional field for the service as well as the above-described form. Table 23 illustrates these additional fields.
- a field for configuring URLLC or FCR may be separately added in the VRG setting field so that the UE may support feedback or related operation according to URLLC through setting of the corresponding field.
- the AdvancedCSI field uses more overhead but may be set for eMBB operation as a field for providing enhanced channel state information providing accurate information.
- the above-mentioned direct VRG service type setting and indirect type setting may be combined and used.
- eMBB may be frequently used as a service commonly used in all base stations. Therefore, field 00 indicates an eMBB so that the eMBB can be set directly, and the remaining three fields can be used as a service set.
- Table 23 is an example of indirect service type setting for the VRG, and the expression of the indirect corresponding field may be changed. In addition, although Table 23 illustrates a field using two bits, the number of bits in an actual field may be different from the above table.
- the base station may add an identifier (ID) for identifying the VRG to the VRG configuration information in the corresponding field.
- ID an identifier
- the base station can easily set or trigger corresponding VRG related information when using periodic CSI-RS and channel state information reporting or aperiodic CSI-RS and channel state information reporting through aperiodic trigger. That is, the base station may indicate a specific VGR by setting the ID together when aperiodic trigger transmission or aperiodic CSI-RS configuration or channel state information reporting is configured in the terminal.
- the ID may be one of the maximum number of VRG information that can be set from 0.
- the service or vertical allocation in such a frequency-time resource may be supported to be set in units of VRG, and such configuration may be semi-static configuration through RRC signaling or control information simultaneously to terminals of a specific group. It may be dynamically set through downlink control information (which can be exemplified as a group DCI or a common DCI) that can transmit the control information.
- RRC signaling since the service or vertical allocation in these time and frequency resources is constant over a long period, there is little change in the interference situation, so that neighboring base stations can better understand the interference situation of the cell. have.
- the group DCI is transmitted at a predetermined time point between the base station and the terminal, and may be scrambled and transmitted based on the set group Radio Network Temporary Identifier (RNTI).
- RNTI Radio Network Temporary Identifier
- the base station may transmit information on the corresponding VRG set to the UE.
- Tables 25 and 26 below illustrate fields for triggering aperiodic CSI-RS transmission and channel state information reporting on the VRG set.
- Table 25 shows a method for triggering aperiodic CSI-RS transmission and channel state information reporting for each wideband CSI-RS or VRG ID based on preset VRG configuration information and corresponding ID.
- This method has the advantage that the CSI-RS can be transmitted only to the corresponding VRG for each service to be transmitted as needed, but has a disadvantage in that a plurality of downlink control information must be transmitted to trigger the CSI-RS in the plurality of VRGs.
- Table 26 shows a method of triggering reporting of CSI-RS and related channel state information based on a preset VRG configuration information set. Table 27 below illustrates these trigger field settings.
- Each trigger field (eg, trigger 010, trigger 011, etc.) in Table 27 is information indicating a VRG for reporting CSI-RS and channel state information through a corresponding trigger. For example, if the first and second bits of trigger010 are set to 1, the remaining bits are 0, and the value of the request field in Table 26 is 010, the CSI-RS and channel status information in the VRG corresponding to VRG IDs 0 and 1 A report can be made. In this example, the example assumes that the number of VRG settings is the same as the number of bits of the trigger of Table 27 (that is, the number of VRG IDs and the number of trigger bits are the same). However, this field may be different from the above example. It can be set dynamically through a group DCI or a common DCI. Table 28 below illustrates the fields.
- the base station may transmit 2 bits through the DCI transmitted to the terminal, and the corresponding 2 bits may indicate the lowest index and the highest index among the possible VRG sets.
- the base station may inform the user equipment of the available VRG set through the group DCI, and the size of the corresponding bitmap may be equal to the number of VRG set configurations. For example, if the base station transmits 01001000 and 00110000 for the first set and the second set, respectively, through the group DCI, the terminal transmits 01001000 and 00110000 to the VRG corresponding to ID 1 and VRG corresponding to ID 1 in the first set.
- the trigger for the second set is configured to enable the trigger for the VRG corresponding to IDs 2 and 3 in the second set.
- the UE transmits VRGs 1 and 4 when the trigger bit is set to '10' and transmits VRGs for the VRGs of IDs 2 and 3 when the trigger bit is set to '11'.
- configuration fields as shown in Table 29 below may be used for CSI-RS transmission and IMR resource configuration and channel status report configuration.
- the field may include a CSI-RS configuration and a CSI-IM configuration
- the configuration may include an antenna port for NP (non-precoded) CSI-RS when the configuration supports aperiodic CSI-RS.
- N1 and N2 the number of antennas by dimension (direction), O1 and O2, which are oversampling factors, and one subframe config for transmitting multiple CSI-RSs resource config and the like, and when supporting CSI-RS periodically, subframe config information may be additionally included in the corresponding information.
- the antenna port number information of the CSI-IM may be fixed to the standard.
- the antenna port number information may include only the resource config when the resource is aperiodic, and when configured periodically, the subframe config information may be additionally included in the information. have.
- the base station may be configured to include a region where the base station does not transmit data, and this allocation may be wasteful. Therefore, CSI-RS configuration and channel status information reporting configuration can be separated from VRG configuration for efficient resource usage.
- the VRG setting may indirectly serve as a measurement subset when measuring channel state reporting. Table 30 below illustrates the VRG settings for measurement subset operation.
- the codebook subset limit and the P C may be set in the individual VRG setting field as in the above example.
- the terminal may separately report a CSI-RS resource indicator (CSI-RS resource indicator, CRI), a precoding type indicator (PTI), RI, PMI, and CQI based on the set measurement subset.
- CSI-RS resource indicator CRI
- PTI precoding type indicator
- RI RI
- PMI PMI
- CQI channel state information
- This method has the advantage that no additional overhead is required except for the VRG configuration for the subset limitation, but it does not reflect additionally when the interference situation changes due to the service change of another cell in the corresponding VRG.
- the measurement subset may be supported in the VRG for measurement of interference variation by other services, beam directions, and CoMP scenarios in the aforementioned VRG.
- Such a subframe subset configuration method of the VRG may support independent fields for each subset in each VRG or may support separate fields. Table 31 below is an example when supporting independent fields for each measurement subset for measurement subsets in up to three allowed VRGs.
- the subset configuration in the VRG may be more than two. That is, the subset configuration can be set not only on time resources but also on frequency resources.
- a list of corresponding settings may be indicated for individual P C and codebook subset restriction settings for each subset, where the list of corresponding settings is equal to the number of set VRG measurement subsets.
- a setting field is provided for each measurement subset.
- an additional setting field may be provided to support four measurement subsets.
- the terminal may inform the base station of UE capability of the configuration.
- Table 32 below illustrates the fields for such terminal capability reporting.
- the terminal may inform the base station about the number of VRGs that the terminal can support and the supportable measurement subset for each VRG. Through this, it is easy to implement the terminal and support the service more flexibly. If the capability indication is not supported, the implementation of the NR terminal may be complicated and the unit price may increase due to the difficulty of the corresponding implementation. Can be.
- initial channel state acquisition and long-term channel state information acquisition may require CSI-RS transmission for all bands or the entire system band allocated to the terminal.
- CSI-RS transmission may be necessary. Therefore, these two CSI-RS types can be set individually, which can be referred to as CSI-RS type A, CSI-RS type B.
- the CSI-RS Type A supports CSI-RS transmission for all bands or the entire system band to which a terminal is allocated. Accordingly, the UE can secure initial channel state and long-term channel state information based on the CSI-RS type A. Therefore, the CSI-RS Type A requires the resource config setting described in Table 2 above. In the case of aperiodic CSI-RS, a subframe config including period and subframe offset information is not required. In the case of semi-persistent CSI-RS, the subframe config can be maintained as it is. The number of repetitions may be set during CSI-RS transmission.
- CSI-RS Type B unlike CSI-RS Type A, requires configuration of a partial band. Therefore, in the case of CSI-RS Type A, CSI-RS transmission for the entire system band is always assumed, but such CSI-RS Type B may need a method for partial band configuration. Therefore, in consideration of this, a setting for supporting CSI-RS allocation to a specific subband or bandwidth part, RBG, discontinuous RB, and continuous RB may be required. It may be supported by bit-bit or may be supported using downlink resource allocation types 0, 1, and 2 of the LTE system.
- the CSI-RS type B may be supported using an uplink resource allocation method.
- the downlink resource allocation type 0 of the LTE system is a method of allocating resources in RBG units determined according to system bands.
- the base station first uses a bit for indicating a corresponding resource allocation type.
- the UE is based on the RBG size (P) according to the system bandwidth size.
- the corresponding RBG may be allocated using a bitmap of the size and downlink data may be received from the corresponding resource.
- the base station may configure the aperiodic CSI-RS for each RBG by using the corresponding method to inform the UE whether to transmit the aperiodic CSI-RS to the corresponding RBG.
- Downlink resource allocation type 1 is a method of allocating and transmitting an aperiodic CSI-RS to a specific discontinuous RB. This method has the advantage of increasing flexibility in resource usage because it supports aperiodic CSI-RS transmission for each discontinuous RB.
- the base station In order to allocate resources using Type 1, the base station first uses bits to indicate the corresponding resource allocation type.
- signaling overhead is excessively increased, so that the corresponding resources can be divided and transmitted in two as offsets.
- type 1 uses the same amount of signaling as type 0. For this purpose, the UE uses type 1 signaling.
- a corresponding RB may be allocated using a bitmap of the size and downlink data may be received from a corresponding resource.
- the base station may transmit aperiodic CSI-RS to the terminal.
- the base station may configure aperiodic CSI-RS to the terminal using RRC or L1 signaling.
- the base station since the non-periodic CSI-RS transmission does not require information transmission that is not required for CSI-RS transmission, such as MCS per codeword, in the discontinuous RB allocation, the base station allocates downlink resources accordingly. More bits included in DCI may be used to configure aperiodic CSI-RS allocation. In this case, it is also possible to allocate using a bitmap of a subset full size except for offset bits.
- the base station In order to allocate resources based on downlink resource allocation type 2, the base station first indicates whether the corresponding resource allocation is allocated in the form of a localized virtual resource block (LVRB) or a distributed virtual resource block (DVRB). Use Based on this, the RIV (Resource Indication Value) informs the location of the RB where resource allocation starts and the length of the allocated resource. At this time, the start position and the length can be obtained as shown in Equation 3 below according to the DCI format.
- LVRB localized virtual resource block
- DVRB distributed virtual resource block
- the CSI-RS type B also requires the resource config described in Table 2 above.
- a subframe config including period and subframe offset information is not required.
- the subframe config can be maintained as it is. Can be set.
- the terminal receives the CSI-RS on the assumption that the corresponding CSI-RS is transmitted in the entire system-allocated band.
- the CSI-RS configuration is Type B, the UE receives assuming that the corresponding CSI-RS is transmitted in a partial band of the system.
- Such a CSI-RS type configuration may be indirectly set depending on whether the aforementioned subband transmission configuration exists.
- CSI-RS type A is transmitted in the entire band. Therefore, although it is very easy to estimate delay related information (delay spread, average delay, etc.), the Doppler information is not sufficient because the number of transmissions in the time resource of the corresponding transmission is insufficient. It is not suitable for estimation of (Doppler spread, Doppler shift, etc.). Therefore, CSI-RS Type A may be used to estimate only delay related information.
- CSI-RS type B is suitable for Doppler information estimation considering short transmission periods, but not for delay related information estimation. Therefore, CSI-RS Type B can be used only for Doppler information estimation.
- both of the above-mentioned delay information and Doppler information are required.
- the base station transmits CRS and CSI-RS to the terminal, and since the corresponding CRS and CSI-RS are always transmitted using the entire band with a short period, delay information and Doppler information can be obtained only with the corresponding information.
- CRS does not exist and CSI-RS may exist in two forms as described above.
- CSI-RS information such as CSI-RS type A and CSI-RS type B may be set together to estimate delay related information and Doppler information, respectively.
- Channel state information reported based on the CSI-RS type A and the CSI-RS type B may also vary.
- CSI-RS Type A provides information about a channel changing over a relatively long period.
- channel state information reporting method includes channel state information reporting including system band and long period information, channel state including system band information and subband information, and long and short period information simultaneously. There is a way to report information.
- the first method of reporting channel state information using the CSI-RS type A is to allow the UE to report only system band and long period information.
- the UE may use RI, first PMI (W1), and wideband second PMI ( W2), only information such as wideband CQI can be reported to the base station. Based on this, the terminal may report the allocated total system overall band and long-term channel state information.
- the full-band channel state information can support only one type of CQI as a representative because it cannot satisfy the specific part of the allocated service.
- the CQI may be an eMBB CQI, that is, a CQI targeting a 10% BLER, rather than each service-specific CQI, which will be described below.
- the second method is to allow the UE to report subband information simultaneously with the first method. Since this method provides more information than the first method, the base station can know channel state information per subband without additionally transmitting CSI-RS Type B for subband information, thereby increasing transmission efficiency and information amount. You can.
- CSI-RS type A explicit CSI may be supported.
- Explicit CSI means that a UE directly transmits a covariance matrix, which is long-term information of a channel, to a base station. Therefore, such information is preferably supported through the CSI-RS type A.
- the channel state information is reported one by one in the entire system band, but in the NR, a wider system band may be supported. Accordingly, the entire system band is divided into parts to report a plurality of RIs, first PMIs, and CQIs. It is also possible.
- the CSI-RS type B Compared to the CSI-RS type A, the CSI-RS type B provides information about a channel changing in a relatively short period. Therefore, the CSI-RS type B must include the second PMI (W2) and the subband CQI report.
- W2 the second PMI
- W2 the subband CQI report.
- channel state information specific to a specific service to be described below may be supported.
- RI may also be included because the available ranks may vary for each service. For example, in the case of URLLC transmission or control channel, high reliability is required. In this case, the amount of information can be reduced and the reliability can be increased by lowering the supported rank.
- the UE may use RI and subband CQI as a relative value.
- the value can be indicated by an offset as shown in the following table.
- Tables 33, 34, and 35 below are examples for reporting RI and CQI with these relative values.
- the second PMI reported based on CSI-RS type B may be based on the first PMI reported based on CSI-RS type A.
- the UE may report the subband second PMIs and the subband CQIs based on the first PMI corresponding to the corresponding configuration and the reported subbands.
- the CSI-RS type A includes a coverage CSI-RS, a cell-specific CSI-RS, a wideband CSI-RS, a full bandwidth (BW) CSI-RS, and the like.
- the CSI-RS type B may be referred to by another name, such as UE-specific CSI-RS, UE-specific beamformed CSI-RS, partial BW CSI-RS, or the like. It may be indicated by.
- the term CSI-RS may be expressed in various terms such as measurement RS, beam RS, beam measurement RS, and the like.
- FIG. 23 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.
- the terminal receives configuration information on the VRG configuration in step 2300. Through this information, at least one of a VRG related ID, a time or / and frequency resource location of each VRG, a service type, a service set, a support feedback type, and a VRG measurement subset may be set.
- the terminal also transmits the number of antenna ports for each NP CSI-RS based on the received configuration information, N1 and N2, the number of antennas for each dimension, O1 and O2, the oversampling index for each dimension, and a plurality of CSI-RSs.
- At least one of a plurality of resource configs for configuring one subframe config and location, codebook subset restriction information, CSI reporting information, CSI process index, and transmission power information P C may be checked.
- the UE receives one feedback configuration information based on the CSI-RS location.
- the corresponding information may be set to PMI and / or CQI period and offset, RI period and offset, CRI period and offset, whether the feedback is wideband / subband, submode, and the like.
- the terminal receives the CSI-RS based on the corresponding information, and estimates a channel between the base station antenna and the receiving antenna of the terminal based on the information.
- the UE generates RI, PMI, CQI, etc.
- the terminal transmits the feedback information to the base station at the feedback timing determined according to the feedback setting or the aperiodic channel state reporting trigger of the base station, thereby completing the channel feedback generation and reporting process.
- 24 is a diagram illustrating the operation of a base station according to an embodiment of the present invention.
- the base station transmits configuration information on a VRG for measuring a channel to the terminal.
- At least one of time and / or frequency resource location, service type, support feedback type, and VRG measurement subset of each VRG may be configured through the configuration information, and based on this, the NP CSI-RS may be transmitted to transmit the CSI-RS.
- the base station transmits feedback configuration information based on at least one CSI-RS to the terminal in step 2410.
- the corresponding information may be configured with PMI and / or CQI periods and offsets, RI periods and offsets, CRI periods and offsets, feedback to wideband / subband, submode, and the like.
- the base station transmits the configured CSI-RS to the terminal, and the terminal estimates a channel for each antenna port and estimates an additional channel for the virtual resource based on this.
- the terminal determines the feedback, generates a corresponding CRI, PMI, RI and CQI and transmits to the base station. Accordingly, the base station receives feedback information from the terminal at the timing determined in step 2420 and utilizes the channel state between the terminal and the base station.
- 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- the terminal includes a communication unit 2500 and a control unit 2510.
- the communication unit 2500 performs a function of transmitting or receiving data with an external device (for example, a base station).
- the communication unit 2500 may transmit feedback information to the base station under the control of the control unit 2510.
- the controller 2510 controls the states and operations of all components constituting the terminal.
- the controller 2510 generates feedback information according to the information allocated from the base station.
- the controller 2510 controls the communication unit 2500 to feed back the generated channel information to the base station according to the timing information allocated from the base station.
- the controller 2510 may include a channel estimator 2520.
- the channel estimator 2520 determines a location of a corresponding VRG in time and frequency resources through VRG service and feedback information received from a base station, and confirms necessary feedback information through CSI-RS and feedback allocation information related thereto. Based on the feedback information, the channel estimator 2520 estimates a channel using the received CSI-RS.
- a terminal includes a communication unit 2500 and a control unit 2510
- the present disclosure is not limited thereto and may further include various components according to functions performed in the terminal.
- the terminal may further include a display unit for displaying a current state of the terminal, an input unit to which a signal such as a function is performed from a user, a storage unit for storing data generated in the terminal, and the like.
- the channel estimator 2520 is included in the controller 2510, the present invention is not limited thereto.
- the controller 2510 may control the communication unit 2500 to receive configuration information about each of at least one reference signal resource from the base station.
- the controller 2510 may control the communication unit 2500 to receive feedback setting information for measuring the at least one reference signal and generating feedback information according to the measurement result from the base station.
- the controller 2510 may measure at least one reference signal received through the communication unit 2500 and generate feedback information according to the feedback setting information.
- the controller 2510 may control the communicator 2500 to transmit the generated feedback information to the base station at a feedback timing according to the feedback setting information.
- the controller 2510 may receive a CSI-RS from the base station, generate feedback information based on the received CSI-RS, and transmit the generated feedback information to the base station.
- the controller 2510 may select a precoding matrix for each antenna port group of the base station and further select one additional precoding matrix based on the relationship between the antenna port groups of the base station.
- the controller 2510 may receive a CSI-RS from the base station, generate feedback information based on the received CSI-RS, and transmit the generated feedback information to the base station. In this case, the controller 2510 may select one precoding matrix for all antenna port groups of the base station. In addition, the controller 2510 receives feedback setting information from a base station, receives a CSI-RS from the base station, generates feedback information based on the received feedback setting information and the received CSI-RS, and generates the feedback information. It can transmit to the base station. In this case, the controller 2510 may receive additional feedback setting information based on the relationship between the antenna setting and the feedback setting information corresponding to each antenna port group of the base station.
- 26 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.
- the base station includes a control unit 2610 and a communication unit 2600.
- the controller 2610 controls the states and operations of all the components constituting the base station.
- the controller 2610 allocates the CSI-RS resource for the UE and the related configuration for obtaining the VRG information to the UE, and allocates the feedback resource and the feedback timing to the UE.
- the controller 2610 may further include a resource allocator 2620.
- the feedback setting and feedback timing are allocated so that the feedback from various terminals does not collide, and the feedback information set at the corresponding timing is received and interpreted.
- the communication unit 2600 performs a function of transmitting and receiving data, a reference signal, and feedback information to the terminal.
- the communication unit 2600 transmits the CSI-RS to the terminal through the allocated resources under the control of the controller 2610 and receives feedback on the channel state information from the terminal.
- a reference signal is transmitted based on CRI, RI, PMI partial information, CQI, etc. obtained from the channel state information transmitted by the UE.
- the controller 2610 may control the communication unit 2600 or generate the at least one reference signal to transmit setting information about each of the at least one reference signal to the terminal. In addition, the controller 2610 may control the communication unit 2600 to transmit the feedback setting information for generating the feedback information according to the measurement result to the terminal. The controller 2610 may control the communication unit 2600 to transmit the at least one reference signal to the terminal and to receive feedback information transmitted from the terminal at a feedback timing according to the feedback setting information. 2610 may transmit feedback setting information to a terminal, transmit CSI-RS to the terminal, and receive feedback information generated based on the feedback setting information and the CSI-RS from the terminal.
- the controller 2610 may transmit additional feedback configuration information based on the relationship between the feedback configuration information and the antenna port group corresponding to each antenna port group of the base station, and the controller 2610 may control the beamformed CSI- based on the feedback information.
- RS may be transmitted to the terminal and feedback information generated based on the CSI-RS may be received from the terminal.
- a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
- 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, 60 Gigabyte (60 GHz) band).
- mmWave ultra-high frequency
- FD-MIMO full-dimensional multi-input / output Full Dimensional MIMO
- array antennas analog beamforming, and large scale antenna technologies are discussed.
- 5G communication systems have advanced small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway.
- cloud RAN cloud radio access networks
- D2D Device to Device communication
- CoMP Coordinated Multi-Points
- FQAM Hybrid FSK and QAM Modulation
- SWSC Slide Window Superposition Coding
- ACM Advanced Coding Modulation
- FBMC Filter Bank Multi Carrier
- NOMA non -orthogonal multiple access (SPAR), sparse code multiple access (SCMA), and the like are being developed.
- IoT Internet of Things
- IoE Internet of Everything
- M2M Machine to machine
- MTC Machine Type Communication
- IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
- IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
- a plurality of services may be provided to a user in a communication system, and in order to provide the plurality of services to a user, a method and an apparatus using the same are required to provide each service within a same time period according to characteristics.
- the wireless communication system has moved away from providing the initial voice-oriented service, for example, 3GPP High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced ( Evolving into high-speed, high-quality packet data services such as LTE-A), 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e
- 3GPP High Speed Packet Access HSPA
- LTE Long Term Evolution
- E-UTRA Evolved Universal Terrestrial Radio Access
- LTE-Advanced Evolving into high-speed, high-quality packet data services such as LTE-A
- 3GPP2 HRPD High Rate Packet Data
- UMB User Mobile Broadband
- IEEE 802.16e IEEE 802.16e
- 5G wireless communication systems are creating communication standards for 5G or NR (new radio).
- At least one service of enhanced mobile broadband (eMBB), massive machine type communications (MMTC), and ultra-reliable and low-latency communications (URLLC) may be provided to a terminal in a wireless communication system including a fifth generation.
- the services may be provided to the same terminal during the same time period.
- eMBB may be a service for high-speed transmission of high capacity data
- mMTC may be a service aimed at minimizing terminal power and accessing multiple terminals
- URLLC for high reliability and low latency signal transmission.
- the three services may be major scenarios in LTE systems or 5G or new radio, next radio (NR) systems after LTE.
- a base station schedules data corresponding to an eMBB service to a terminal in a specific transmission time interval (TTI)
- TTI transmission time interval
- the eMBB data is already scheduled and transmitted.
- the generated URLLC data may be transmitted in the frequency band without transmitting part of the eMBB data in the frequency band.
- the terminal scheduled for the eMBB and the terminal scheduled for URLLC may be the same terminal or different terminals. In such a case, since the portion of the eMBB data that has already been scheduled and transmitted is not transmitted, the possibility of damaging the eMBB data increases. Therefore, in this case, there is a need to provide a method and a signal receiving method for processing a signal received by a terminal scheduled for eMBB or a terminal scheduled for URLLC.
- the base station is a subject that performs resource allocation for the terminal, and may be referred to as an eNode B, Node B, Base Station (BS), a radio access unit, a base station controller, or a node on a network.
- the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
- UE user equipment
- MS mobile station
- DL downlink
- UL uplink
- UL refers to a radio transmission path of a signal transmitted from a terminal to a base station.
- LTE or LTE-A Long Term Evolution
- NR new radio
- embodiments of the present invention can be applied to other communication systems through some modifications within the scope of the present invention without departing from the scope of the present invention as determined by those skilled in the art.
- the LTE system which is a representative example of the broadband wireless communication system, employs an orthogonal frequency division multiplexing (OFDM) scheme in downlink and a single carrier frequency division multiple access (SC-FDMA) scheme in uplink.
- OFDM orthogonal frequency division multiplexing
- SC-FDMA single carrier frequency division multiple access
- data or control information of each user can be distinguished by allocating and operating the time-frequency resources to carry data or control information for each user so as not to overlap each other, that is, to establish orthogonality. have.
- the LTE system adopts a hybrid automatic repeat request (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs in the initial transmission.
- HARQ hybrid automatic repeat request
- the receiver when the receiver fails to correctly decode (decode) the data, the receiver transmits information (Negative Acknowledgement, NACK) indicating the decoding failure to the transmitter so that the transmitter can retransmit the corresponding data in the physical layer.
- NACK Negative Acknowledgement
- the receiver combines and decodes the data retransmitted by the transmitter with previously decoded data to increase data reception performance.
- the receiver may transmit an acknowledgment (ACK) indicating the decoding success to the transmitter so that the transmitter may transmit new data.
- ACK acknowledgment
- FIG. 27 illustrates a basic structure of a time-frequency domain, which is a radio resource region of a downlink, in an LTE system or the like.
- the horizontal axis represents a time domain and the vertical axis represents a frequency domain.
- the minimum transmission unit in the time domain is an OFDM symbol.
- N symb 2702 OFDM symbols are gathered to form one slot 2706, and two slots are together to constitute one subframe 2705.
- the length of the slot is 0.5ms and the length of the subframe is 1.0ms.
- a frame 2714 is a time domain section consisting of 10 subframes.
- the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of a total of N BW 2704 subcarriers. However, such specific values may be applied variably.
- the basic unit of a resource in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as a resource element (RE) 2712.
- a resource block (RB or physical resource block, PRB) 2708 may be defined as N symb 2702 contiguous OFDM symbols in the time domain and N RB 2710 contiguous subcarriers in the frequency domain. Accordingly, one RB 2708 in one slot may include N symb x N RB REs 2712.
- a frequency-domain minimum allocation unit of data is the RB.
- the data rate increases in proportion to the number of RBs scheduled to the UE.
- the LTE system can define and operate six transmission bandwidths.
- FDD frequency division duplex
- the downlink transmission bandwidth and the uplink transmission bandwidth may be different.
- the channel bandwidth represents an RF bandwidth corresponding to the system transmission bandwidth.
- Table 36 below shows a correspondence relationship between a system transmission bandwidth and a channel bandwidth defined in the LTE system. For example, an LTE system having a 10 MHz channel bandwidth may have a transmission bandwidth of 50 RBs.
- the downlink control information may be transmitted within the first N OFDM symbols in the subframe.
- N ⁇ 1, 2, 3 ⁇ . Accordingly, the N value may be variably applied to each subframe according to the amount of control information to be transmitted in the current subframe.
- the transmitted control information may include a control channel transmission interval indicator indicating how many control information is transmitted over OFDM symbols, scheduling information for downlink data or uplink data, and information about HARQ ACK / NACK.
- DCI downlink control information
- DCI is defined in various formats, whether it is scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data, whether it is compact DCI with a small size of control information, multiple
- the DCI format determined according to whether spatial multiplexing using an antenna is applied to data or whether power control is used is applied.
- DCI format 1 which is scheduling control information 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.
- resources are allocated in units of resource block groups (RBGs) by applying a bitmap method.
- a basic unit of scheduling is a resource block (RB) represented by time and frequency domain resources, and an RBG is composed of a plurality of RBs to become a basic unit of scheduling in a type 0 scheme.
- Type 1 allows allocating a specific RB within the RBG.
- Resource block assignment Notifies the RB allocated for data transmission.
- the resource to be represented is determined according to the system bandwidth and the resource allocation method.
- Modulation and coding scheme Notifies the modulation scheme used for data transmission and the size of a transport block that is data to be transmitted.
- HARQ process number Notifies the process number of HARQ.
- New data indicator notifies whether the data transmission is HARQ initial transmission or retransmission.
- Redundancy version Notifies the redundant version of HARQ.
- TPC Transmit Power Control
- PUCCH Physical Uplink Control Channel
- the DCI is transmitted through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), which is a downlink physical control channel through channel coding and modulation.
- PDCH physical downlink control channel
- EPDCCH enhanced PDCCH
- the DCI is channel-coded independently for each user equipment and then composed of independent PDCCHs and transmitted.
- the PDCCH is mapped and transmitted during the control channel transmission interval, and the frequency domain mapping position of the PDCCH is determined by an identifier (ID) of each terminal and spread over the entire system transmission band.
- ID an identifier
- the downlink data is transmitted through a physical downlink shared channel (PDSCH) which is a downlink physical data channel.
- PDSCH physical downlink shared channel
- Downlink data on a PDSCH is transmitted after the control channel transmission interval.
- Scheduling information such as specific mapping positions and modulation schemes of data in a frequency domain is indicated by a DCI transmitted through the PDCCH.
- the base station notifies the UE of a modulation scheme applied to downlink data to be transmitted and a transport block size (TBS) of data to be transmitted through an MCS configured of 5 bits among the control information configuring the DCI.
- TBS corresponds to the size before channel coding for error correction is applied to data to be transmitted by the base station (which can be understood as a transport block).
- Modulation schemes supported in 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, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.
- QPSK Quadrature Phase Shift Keying
- 16QAM Quadrature Amplitude Modulation
- 64QAM 64QAM
- each modulation order (Q m ) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.
- modulation schemes of 256QAM or more may be used depending on system modifications.
- FIG. 28 is a diagram illustrating a basic structure of a time-frequency domain that is an uplink radio resource region of an LTE-A system.
- the horizontal axis represents a time domain and the vertical axis represents a frequency domain.
- the minimum transmission unit in the time domain is an SC-FDMA symbol 2802, and N symb SC-FDMA symbols may be collected to form one slot 2806. Two slots are gathered to form one subframe 2805.
- the minimum transmission unit in the frequency domain is a subcarrier, and the entire system transmission bandwidth 2804 is composed of a total of N BW subcarriers. N BW may have a value proportional to the system transmission band.
- the basic unit of a resource in the time-frequency domain may be defined as an SC-FDMA symbol index and a subcarrier index as a resource element (RE, 2812).
- a resource block pair (RB pair) 2808 may be defined as N symb consecutive SC-FDMA symbols in the time domain and N RB consecutive subcarriers in the frequency domain.
- one RB is N symb It consists of x N RB REs.
- the minimum transmission unit of data or control information is an RB unit, and in the case of a physical uplink control channel (PUCCH), it is mapped to a frequency domain corresponding to 1 RB and transmitted for 1 subframe.
- PUCCH physical uplink control channel
- a HARQ corresponding to a physical downlink shared channel which is a downlink physical data channel, or a semi-persistent scheduling release (hereinafter, referred to as SPS release), or a HARQ corresponding to an enhanced PDCCH (EPDDCH)
- PDSCH physical downlink shared channel
- SPS release semi-persistent scheduling release
- EPDDCH enhanced PDCCH
- a timing relationship between a PUCCH, which is an uplink physical control channel for transmitting ACK / NACK, or a physical uplink shared channel (PUSCH), which is an uplink physical data channel may be defined, for example, an n-4th sub in an LTE system operating with FDD.
- HARQ ACK / NACK corresponding to PDCCH or EPDCCH including downlink data or SPS release on PDSCH transmitted in a frame may be transmitted on PUCCH or PUSCH in nth subframe. It may be expressed as a PDCCH transmission or a PUCCH transmission, and transmission of data or control information on the PDSCH or the PUSCH is performed before the PDSCH. It may be expressed as a song or a PUSCH transmission.
- downlink HARQ adopts an asynchronous scheme in which data retransmission time is not fixed. That is, when the base station receives the HARQ NACK feedback from the terminal with respect to the initial transmission data transmitted by the base station, the base station freely determines the transmission time of the retransmission data by the scheduling operation. The UE may buffer the data determined to be an error as a result of decoding the received data for the HARQ operation, and then perform combining with the next retransmission data.
- uplink control information including HARQ ACK or NACK of the downlink data in subframe n + k is transmitted to the base station through PUCCH or PUSCH. send.
- k may be defined differently according to FDD or time division duplex (TDD) and subframe configuration of the LTE system.
- TDD time division duplex
- k is fixed to 4.
- k may be changed according to the subframe configuration and the subframe number.
- a value of k may be differently applied according to the TDD setting of each carrier. In the case of the TDD, the k value is determined according to the TDD UL / DL configuration as shown in Table 37 below.
- the uplink HARQ adopts a synchronous method in which a data transmission time is fixed. That is, the uplink / downlink timing relationship of a physical hybrid indicator channel (PHICH), which is a physical channel through which a PUSCH, a PDCCH preceding it, and a downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted, may be determined by the following rule.
- PHICH physical hybrid indicator channel
- k may be defined differently according to FDD or TDD of LTE system and its configuration. For example, in the case of an FDD LTE system, k may be fixed to four. Meanwhile, in the TDD LTE system, k may be changed according to subframe configuration and subframe number. Also, when data is transmitted through a plurality of carriers, the value of k may be differently applied according to the TDD setting of each carrier. In the case of the TDD, the k value is determined according to the TDD UL / DL configuration as shown in Table 38 below.
- HARQ ACK / NACK information on the PUSCH transmitted by the UE in subframe n is transmitted through the PHICH from the base station to the UE in subframe n + k.
- k may be defined differently according to FDD or TDD of LTE system and its configuration.
- FDD LTE system k is fixed to 4.
- TDD LTE system k may be changed according to subframe configuration and subframe number.
- a value of k may be differently applied according to the TDD setting of each carrier.
- the k value is determined according to the TDD UL / DL configuration as shown in Table 39 below.
- the present invention is not limited to the LTE system but may be applied to various wireless communication systems such as NR and 5G systems.
- the k value when applied to another wireless communication system, the k value may be changed and applied to a system using a modulation scheme corresponding to FDD.
- 29 and 30 illustrate examples in which data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, are allocated in frequency-time resources.
- FIG. 29 shows an example in which data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band 2900.
- the transmitter is already assigned the eMBB 2910 and the mMTC 2950.
- URLLC data 2920, 2930, and 2940 may be transmitted without emptying or transmitting the reserved portion. Since it is necessary to reduce the delay time for the URLLC among the above services, URLLC data may be allocated 2920, 2930, and 2940 to a portion of the resource 2900 to which the eMBB is allocated, and may be transmitted.
- eMBB data may not be transmitted in the overlapping frequency-time resource, and thus transmission performance of the eMBB data may be lowered. That is, eMBB data transmission failure may occur due to URLLC allocation.
- the transmitter may transmit service and data in each of the subbands 3010, 3020, and 3030 by dividing the entire system frequency band 3000.
- Information related to the subband configuration may be predetermined, and the information may be transmitted by the base station to the terminal through higher signaling.
- the base station or the network node may randomly divide the frequency band into subbands and provide services to the UE without transmitting subband configuration information.
- FIG. 30 illustrates a case in which subband 3010 is used for eMBB data transmission, subband 3020 is URLLC data transmission, and subband 3030 is used for mMTC data transmission.
- the length of the transmission time interval used for URLLC transmission may be shorter than the TTI length used for eMBB or mMTC transmission.
- the response of the information related to the URLLC can be sent faster than eMBB or mMTC, thereby transmitting and receiving the URLLC-related information with a low delay.
- FIG. 31 illustrates a process in which one transport block (TB) is divided into a plurality of code blocks (CBs) and a cyclic redundancy check (CRC) bit is added.
- TB transport block
- CBs code blocks
- CRC cyclic redundancy check
- one TB 3100 to be transmitted in the uplink or the downlink may be added with a CRC 3105 at the end or the beginning.
- the CRC may have 16 bits or 24 bits or a fixed number of bits, or may have a variable number of bits depending on channel conditions, and may be used to determine whether channel coding is successful.
- the blocks 3100 and 3105 having the CRC added to the TB may be divided into several code blocks 3115, 3120, 3125, and 3130 (3110).
- the code block may be divided by a predetermined maximum size, in which case the last code block 3130 may be smaller than other code blocks, or the transmitter may have a length equal to that of other code blocks by adding 0, a random value, or 1 Can be lengthened to CRCs 3135, 3140, 3145, and 3150 may be added to the divided code blocks, respectively (3155).
- the CRC may have 16 bits or 24 bits or a fixed number of bits and may be used to determine whether channel coding is successful. However, the CRC 3105 added to the TB and the CRCs 3135, 3140, 3145, and 3150 added to the code block may be omitted depending on the type of channel code to be applied to the code block.
- the CRCs 3135, 3140, 3145 and 3150 to be inserted for each code block may be omitted.
- the CRCs 3135, 3140, 3145, and 3150 may be added to the code block as it is.
- CRC may be added or omitted even when a polar code is used.
- FIG. 32 is a diagram showing a signal transmission method used by an outer code
- FIG. 33 is a block diagram showing the structure of a communication system in which the outer code is used.
- CRCs may be added to the respective code blocks and the parity code blocks generated by the second channel code encoding, respectively (3230 and 3240). Whether or not the CRC is added depends on the type of channel code. For example, when the turbo code is used as the first channel code, the CRCs 3230 and 3240 are added, but the respective code blocks and parity code blocks may be encoded by the first channel code encoding.
- the channel code used for the second channel coding may be, for example, a Reed-solomon code, a Bose-Chaudhuri-Hocquenghem code, a Raptor code, a parity bit generation code, or the like. have.
- the bits or symbols that pass through the second channel coding encoder 3355 then pass through the first channel coding encoder 3360.
- the channel code used for the first channel coding includes a convolutional code, an LDPC code, a turbo code, and a polar code.
- the channel-coded symbols are received by the receiver through the channel 3365, and the receiver may sequentially operate the first channel coding decoder 3370 and the second channel coding decoder 3375 based on the received signal. .
- the first channel coding decoder 3370 and the second channel coding decoder 3375 may perform operations corresponding to the first channel coding encoder 3360 and the second channel coding encoder 3355, respectively.
- the outer code when the outer code is not used (3350), only the first channel coding encoder 3310 and the first channel coding decoder 3330 are used in the transceiver, respectively, and the second channel coding encoder and the second channel coding decoder are not used. . Even when the outer code is not used, the first channel coding encoder 3310 and the first channel coding decoder 3330 may be configured in the same manner as when the outer code is used.
- the eMBB service described below is called a first type service and the eMBB data is called first type data.
- the first type of service or the first type of data is not limited to the eMBB, but may also apply to a case in which high-speed data transmission is required or broadband transmission is required.
- the URLLC service is referred to as a second type service, and the URLLC data is referred to as second type data.
- the second type service or the second type data is not limited to URLLC, but may also correspond to a case in which low latency time is required or high reliability transmission is required, or other systems in which low latency time and high reliability transmission are simultaneously required.
- the mMTC service is referred to as type 3 service
- the data for mMTC is referred to as type 3 data.
- the third type service or the third type data is not limited to the mMTC, and may correspond to a case where a low speed or wide coverage, or low power consumption is required.
- the first type service includes or does not include the third type service.
- the structure of the physical layer channel used for each type to transmit the three types of services or data may be different. For example, at least one of a length of a transmission time interval, an allocation unit of frequency resources, a structure of a control channel, and a data mapping method may be different.
- a length of a transmission time interval For example, at least one of a length of a transmission time interval, an allocation unit of frequency resources, a structure of a control channel, and a data mapping method may be different.
- three types of services and three types of data are described, but more types of services and corresponding data may exist, and in this case, the contents of the present invention may be applied.
- the embodiment defines the transmission and reception operations of the terminal and the base station for the first type, second type, third type service or data transmission as described above, and the terminals receiving different types of service or data scheduling together in the same system. Suggest specific ways to operate.
- the first type, the second type, and the third type terminal refer to a terminal which has received a type 1, type 2, type 3 service or data scheduling, respectively.
- the first type terminal, the second type terminal, and the third type terminal may be the same terminal or may be different terminals.
- At least one of an HARQ ACK / NACK, an uplink scheduling grant signal, and a downlink data signal on the PHICH are referred to as a first signal.
- at least one of the uplink data signal for the uplink scheduling grant and the HARQ ACK / NACK for the downlink data signal is called a second signal. That is, if a signal is expected from the terminal among the signals transmitted from the base station to the terminal may be a first signal, the response signal of the terminal corresponding to the first signal may be a second signal.
- the service type of the first signal may be at least one of eMBB, URLLC, and mMTC, and the second signal may also correspond to at least one of the services.
- DCI format 0 or 4 transmitted on a PDCCH and ACK / NACK on PHICH may be a first signal, and a corresponding second signal may be uplink data transmission on a PUSCH.
- a corresponding second signal may be uplink data transmission on a PUSCH.
- downlink data transmission on a PDSCH may be a first signal in a LTE and LTE-A system
- a PUCCH or a PUSCH including HARQ ACK / NACK information on the downlink data may be a second signal. have. Therefore, in this case, the first signal is received by the terminal and the second signal is received by the base station.
- the downlink control signal may be a first signal
- the second signal may be downlink data scheduled by the downlink control signal.
- the parts described in the present invention may be modified and applied to the case where both the first signal and the second signal are received by the terminal.
- the TTI length of the first signal may indicate the length of time that the first signal is transmitted as a time value associated with the first signal transmission.
- the TTI length of the second signal may indicate the length of time that the second signal is transmitted as a time value associated with the transmission of the second signal.
- the second signal transmission timing is information on when the terminal transmits the second signal and when the base station receives the second signal, and may be referred to as a second signal transmission timing.
- the base station when the base station transmits the first signal in the n-th TTI, assuming that the terminal transmits the second signal in the n + k-th TTI, the base station informs the terminal the timing to send the second signal is k value Is like telling.
- the base station when the base station transmits the first signal in the n-th TTI, assuming that the terminal transmits the second signal in the n + 4 + a-th TTI, the base station informs the terminal of the timing to send the second signal is offset value a It's like telling.
- the offset may be defined by various methods such as n + 3 + a and n + 5 + a instead of n + 4 + a.
- the offset a value may be defined in various ways in the n + 4 + a value mentioned in the present invention. could be.
- the contents of the present invention will be described based on the FDD LTE system, but may be applied to a TDD system and an NR system.
- the higher layer signaling is a signal transmission method transmitted from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer, RRC signaling, or PDCP signaling, It may also be referred to as a MAC control element (MAC CE).
- MAC CE MAC control element
- the method of transmitting the second signal may be possible in various ways. For example, after the UE receives the downlink data on the PDSCH, the timing of transmitting HARQ ACK / NACK information corresponding to the downlink data to the base station follows the method described in the present invention, but is used to transmit the ACK / NACK information. Selection of a PUCCH format, selection of a PUCCH resource, or a method of mapping HARQ ACK / NACK information to a PUSCH may follow the method of the conventional LTE system.
- a normal mode is a mode using a first signal and a second signal transmission timing used in conventional LTE and LTE-A systems, and includes a timing advance (TA) in the normal mode.
- TA timing advance
- a signal processing time of about 3 ms can be secured.
- transmission of the second signal for the first signal received by the terminal in subframe n is performed by the terminal in subframe n + 4.
- the delay reduction mode is a mode in which the transmission timing of the second signal with respect to the first signal is faster than or equal to the normal mode, and the delay time may be reduced.
- the transmission and reception timing may be controlled in various ways.
- the description is based on the case where the lengths of the transmission time intervals used in the normal mode and the delay reduction mode are the same.
- the present invention is applicable even when the TTI in the normal mode and the TTI in the delay reduction mode are different. It will be possible.
- the LTE system transmits and receives signals in subframe units having a TTI of 1 ms.
- the LTE system operating as described above may support a terminal having a transmission time interval shorter than 1 ms (shortened-TTI, shorter-TTI UE, hereinafter shortened-TTI terminal).
- Short-TTI terminals are expected to be suitable for services such as voice over LTE (VoLTE) services and remote control where latency is important.
- the short-TTI terminal is expected to be a means for realizing a mission critical Internet of Things (IoT) based on a cellular communication system.
- IoT mission critical Internet of Things
- the base station and the terminal are designed to transmit and receive in units of subframes having a TTI of 1 ms.
- a short-TTI terminal operating with a TTI shorter than 1 ms in an environment where a base station and a terminal operating with a TTI of 1 ms exist, it is necessary to define a transmission and reception operation different from that of a general LTE and LTE-A terminal. Therefore, the present invention can be applied to a specific method for operating a general LTE and LTE-A terminal and a short-TTI terminal in the same system.
- the delay reduction mode may be an operation of performing data transmission / reception using shortened-TTI.
- shortened-TTI, shorter-TTI, shortened TTI, shorter TTI, short TTI, sTTI, mini-slot (mini slot), sub-slot (subslot) may have the same meaning and may be used interchangeably.
- the shortened TTI or mini-slot may be a unit transmitted in an OFDM symbol of less than 14 or 7.
- normal-TTI, normal TTI, subframe TTI, legacy TTI, slot TTI have the same meaning and may be used interchangeably.
- a channel for a downlink control signal for short-TTI may be referred to as sPDCCH and may be mixed with a short-TTI PDCCH.
- a channel for downlink data for short-TTI may be referred to as an sPDSCH and may be mixed with a PDSCH for short-TTI.
- a channel for uplink data for short-TTI may be referred to as an sPUSCH and may be mixed with a short-TTI PUSCH.
- the channel for the uplink control signal for short-TTI may be referred to as sPUCCH and may be mixed with the PUCCH for short-TTI.
- the present invention describes a transmission and reception method for a system using a shortened TTI, transmission and reception for the purpose of reducing delay of transmitting an uplink transmission or a downlink HARQ feedback in a shorter time than a conventional LTE system based on a 1ms TTI length. Applicability to the method will be apparent to those with ordinary wireless communication knowledge.
- the present invention has been mainly described based on the case where the base station sets the delay reduction mode to the terminal, but it may be applicable even if there is no delay reduction mode setting.
- the base station notifies the terminal of operating in delay reduction mode through higher layer signaling, and accordingly, the terminal determines the second signal transmission and resource and power adjustment timing according to the setting of the higher layer signaling.
- 34 is a diagram showing Embodiment 3-1.
- the base station sets a delay reduction mode to higher layer signaling to the terminal (3400).
- the higher layer signaling may be RRC signaling or may be a MAC control element.
- the base station transmits the transmission timing information of the second signal according to the first signal to the terminal in the higher layer signaling (3410). Thereafter, the terminal transmits the second signal at a predetermined timing according to the transmission timing information.
- the base station receives and decodes the second signal (3420).
- the base station when the base station transmits the first signal in the n-th TTI, assuming that the terminal transmits the second signal in the n + k-th TTI, the base station informs the terminal when to transmit the second signal It is like telling the value of k.
- the base station when the base station transmits the first signal in the n-th TTI, assuming that the terminal transmits the second signal in the n + 4 + a-th TTI, the base station informs the terminal of the timing to send the second signal is offset value a It's like telling.
- the offset may be defined in various ways such as n + 3 + a and n + 5 + a instead of n + 4 + a.
- the terminal receives the k value or the offset value a for the second signal transmission timing from the base station through higher layer signaling (3410), and when the terminal receives the first signal in the nth TTI, In operation 3420, the second signal is transmitted from the n + k th TTI or the n + 4 + a th TTI to the base station according to the transmission timing information.
- the base station may determine the k value or a value with reference to the terminal capability that the terminal reports to the base station.
- K or offset a notified by the higher signaling may be a set of several values instead of one specific value.
- the terminal may use one of k or a set of offsets a transmitted through higher layer signaling to determine the second signal transmission timing.
- One value in the set may be selected according to a specific bit of the DCI transmitted together when the first signal is transmitted from the base station, or may be arbitrarily selected by the terminal.
- the information notified by the higher layer signaling may be a set of k values or offsets determined based on a specific TDD UL / DL configuration and a TTI index value in a TDD system.
- the base station and the terminal can clearly know when the upper layer signaling is applied, so that the base station is a MAC control element to the terminal. If the delay reduction mode setting has been made in subframe n, it may be possible to allow the delay reduction mode to be applied from subframe n + 6, for example.
- the operation of the terminal and the base station has been described based on the delay reduction mode, it may be applicable even if the delay reduction mode is not.
- the present invention may be applicable to the case where the second signal transmission timing for the first signal is transmitted to the terminal in the 5G communication system.
- Embodiment 2-3 provides a method for a base station to determine a timing at which a second signal is transmitted from a terminal or a timing at which power control is started through a DCI, and FIG. 35 illustrates the embodiment 3-2. Drawing.
- the base station sets the delay reduction mode to higher layer signaling to the terminal (3500).
- the base station determines a timing at which the terminal transmits the second signal, and transmits the timing using a specific x bit in the DCI transmitted when transmitting the first signal to the terminal (3510).
- the number of bits x may be set to 1, 2, 3, or the like.
- the size of the x bits and the transmission timing indicated by the information may be pre-allocated in the higher layer signaling configuration. That is, the base station may transmit a k value or an offset value a indicated by HARQ timing bits 00, 01, 10, and 11 to the UE through higher layer signaling in Table 40 below.
- the base station receives and decodes the second signal at the predetermined second signal transmission timing.
- the UE After decoding the downlink control signal, the UE checks a specific x bit in the DCI and checks the k value or the offset value a for the second signal transmission timing from the specific x bit value (3520).
- the terminal receives the first signal in the n-th TTI, and transmits the corresponding second signal to the base station in the n + k th TTI or n + 4 + a th TTI (3530).
- the base station may inform the k value for the second signal transmission timing as follows.
- the base station may inform the offset value a value for the second signal transmission timing as shown in Table 41 below.
- the base station may refer to the terminal capability reported by the terminal to the base station.
- Embodiment 3-2-1 is transmitted in higher layer signaling when the base station instructs the timing at which the second signal is transmitted from the terminal or the timing at which power control is started through the DCI in the embodiment 3-2.
- One of the HARQ timing values provides a way to always use a fixed value.
- Fig. 36 is a diagram showing the third-2-1 embodiment.
- the fixed value may be default timing.
- the base station transmits a set of values that may be a k value or an offset value a for transmission of the second signal through higher layer signaling to the terminal (3600).
- the base station determines the timing at which the terminal transmits the second signal and transmits the timing using a specific x bit in the DCI transmitted when transmitting the first signal to the terminal, and the terminal identifies the bit field of the timing information in the detected DCI. (3610).
- the number of bits x may be set to 1, 2, 3, or the like.
- the size of the x bits and the transmission timing indicated by the information may be pre-allocated in the higher layer signaling. That is, the base station may transmit a k value or an offset value a indicated by HARQ timing bits 01, 10, and 11 to the terminal through higher layer signaling in the following table.
- the specific value of the HARQ timing bit may be transmitted in advance between the base station and the terminal or transmitted in a system information block (SIB) without being transmitted from higher layer signaling.
- SIB system information block
- the HARQ timing bit is 00
- the k value or the offset a value may be a timing transmitted in the SIB.
- the timing delivered in the SIB may be called a basic timing.
- the HARQ timing bit is 01 or 10 or 11 instead of 00, one of the values transmitted from higher layer signaling may be used.
- the UE After decoding the downlink control signal, the UE checks a specific x bit in the DCI and determines whether the specific x bit value is a specific value (3620).
- the specific value may be 00, for example. If the x bit value is 00, the terminal transmits a second signal to the base station in advance or according to a basic timing set to SIB (3630). That is, when the terminal receives the first signal in the nth TTI, The second signal is transmitted from the n + k th TTI or the n + f + a th TTI to kN and k or a may be a value previously set or set to SIB.
- the f may be a reference value for the offset and may be a fixed value previously promised by the base station and the terminal or transmitted from the base station to the terminal in SIB.
- the terminal checks the k value or the offset value a for the second signal transmission timing from the x bit.
- the terminal receives the first signal in the n-th TTI, and transmits the corresponding second signal to the base station in the n + k th TTI or n + f + a th TTI (3640).
- the f may be a reference value for the offset and may be transmitted to the terminal from the base station through SIB or higher layer signaling or a value previously promised by the base station and the terminal.
- the base station may inform the k value for the second signal transmission timing as shown in Table 42 below.
- the offset may be used to determine the second signal transmission timing by adding to the basic timing known to the terminal through the SIB.
- the base station may refer to the terminal capability reported by the terminal to the base station.
- the DCI detected when the base station indicates a timing at which the second signal is transmitted from the terminal to the terminal or a timing at which power control is started is specified.
- a method of using a fixed value as the second signal transmission timing is always provided.
- Fig. 37 is a diagram showing the third-2-2 embodiment.
- the fixed value may be basic timing.
- the base station transmits a k value of the basic timing for transmitting the second signal or a reference timing (that may mean f) to use the offset value a in the SIB to the terminal, and k for transmitting the second signal through higher layer signaling.
- a set of values that may be a value or an offset value a is transmitted to the terminal (3700).
- the base station determines a timing at which the terminal transmits the second signal, and if the timing is not the basic timing, transmits the timing using a specific x bit in the DCI transmitted when transmitting the first signal to the terminal. If the timing is the default timing, the base station transmits a DCI that does not include a timing bit field (which can be understood to use a specific DCI format that does not include a timing bit field).
- the base station may transmit a DCI including a timing bit field (indicating the basic timing).
- the terminal attempts to detect the DCI and checks whether a timing bit field exists in the detected DCI (3710). If the timing bit field is present in the DCI, the terminal identifies a specific x bit in the DCI after downlink control signal decoding and identifies the k value or the offset value a for the second signal transmission timing from the specific x bit value.
- the terminal receives the first signal in the n-th TTI, and transmits the second signal corresponding to the k value or the offset value a to the base station in the n + k th TTI or n + f + a th TTI (3730) .
- the f may be a reference value for the offset and may be transmitted to the terminal in higher layer signaling or SIB.
- the UE transmits a second signal at the basic timing transmitted from the SIB (3720). That is, the terminal may transmit the second signal according to the k or a value indicated by the SIB.
- the DCI sets the specific search area (in the embodiment 3-2).
- a method of always using a fixed value as a second signal transmission timing is provided.
- Fig. 38 is a diagram showing Embodiment 3-2-3.
- the fixed value may be basic timing.
- the base station transmits a reference timing for using the k value or the offset value a of the basic timing for the second signal transmission to the terminal using the SIB, and becomes a k value or the offset value a for the second signal transmission with higher layer signaling.
- the set of possible values is transmitted to the terminal (3800).
- the base station has previously promised the terminal to map the first signal for the second signal to be transmitted at the basic timing to a specific search area.
- the base station determines the timing at which the terminal transmits the second signal, and if the timing is not the basic timing, transmits the timing using a specific x bit in the DCI transmitted when transmitting the first signal to the terminal.
- the base station maps the DCI to a search region other than the specific search region for the basic timing unless it is the case of the basic timing, and maps the DCI to the specific search region for the basic timing if the case is the basic timing.
- the terminal attempts to detect the DCI and checks whether the DCI is detected in a specific search region for the basic timing (3810). If the DCI is detected in a search region other than the specific search region for the basic timing, the terminal checks a specific x bit in the DCI after decoding the downlink control signal and k from the specific x bit value for the second signal transmission timing. Check the value or offset value a.
- the terminal receives the first signal in the n-th TTI, the terminal transmits the second signal corresponding to the base station in the n + k th TTI or n + f + a th TTI (3830).
- the f may be a reference value for the offset and may be delivered to the terminal in higher layer signaling or SIB.
- the terminal transmits a second signal at the basic timing transmitted from the SIB (3820). That is, the terminal may transmit the second signal according to the k or a value indicated by the SIB.
- Embodiment 3-3 provides a method for a UE to transmit HARQ ACK / NACK information for downlink data transmitted in a plurality of TTIs in one TTI according to a change in HARQ timing.
- Fig. 39 shows the third embodiment.
- downlink data When downlink data is transmitted to a UE having a delay reduction mode set 3900 as in the embodiment 3-1 or embodiment 3-2, it corresponds to HARQ ACK / NACK that the UE should transmit to the base station at a specific TTI n.
- HARQ ACK / NACK that the UE should transmit to the base station at a specific TTI n.
- HARQ-ACK bundling and multiplexing configuration and the PUCCH format to be used may be configured with higher layer signaling from the base station to the terminal (3910).
- HARQ-ACK bundling When HARQ-ACK bundling is configured when the UE transmits HARQ ACK / NACK corresponding to two or more PDSCHs, the UE performs ACK when all of the ACK / NACK information corresponding to codewords on the two PDSCHs is ACK. In other cases (ie, only one ACK or not all ACKs), NACK is generated to generate up to two HARQ ACK / NACK information.
- the generated HARQ ACK / NACK information may be transmitted using PUCCH format 1a or 1b.
- HARQ ACK / NACK information generated through HARQ-ACK bundling by the UE will be 1 bit, which is transmitted in PUCCH format 1a. do.
- HARQ ACK / NACK information generated by the UE through HARQ-ACK bundling will be 2 bits, which is transmitted in PUCCH format 1b. do.
- HARQ-ACK multiplexing is configured when the UE transmits HARQ ACK / NACK corresponding to two or more PDSCHs, the UE generates ACK information only when it is ACK for all codewords of each PDSCH and otherwise generates NACK. .
- the UE in case of PDSCH transmitted in up to M TTIs, the UE generates M-bit HARQ ACK / NACK information.
- the generated HARQ ACK / NACK information of M bits may be delivered to a base station using PUCCH format 1b with channel selection or PUCCH format 3.
- 2 bits b (0) and b (1) used for PUCCH format 1b may be determined.
- I may be an integer equal to 0 or 1 or 2 or 3.
- the number of HARQ ACK information bits to be transmitted by the UE may be transmitted in a DCI (for example, as a DAI value on the DCI) in the method described in embodiments 3-4 of the present invention (3920).
- PUCCH transmission resource in the above
- a channel selection method of PUCCH format 1a or 1b or 1b has been described in order to transmit HARQ ACK / NACK information on downlink data transmitted in a plurality of TTIs to a base station in one TTI.
- the UE determines the number of HARQ ACK / NACK information to be transmitted when transmitting the PUCCH or PUSCH. The determination may be determined by referring to a downlink assignment index (DAI) value, which is included in the control information and transmitted during previous downlink data transmission or PUSCH scheduling.
- DAI downlink assignment index
- the UE configures HARQ ACK / NACK information from the HARQ ACK / NACK information of the PDSCH transmitted first to the HARQ ACK / NACK information of the PDSCH transmitted most recently, the number of HARQ ACK / NACK bits may be determined from the DAI value. Can be.
- the terminal may transmit the HARQ ACK / NACK information to the base station using the PUCCH format 3 or 4 or 5.
- a UE in which a delay reduction mode is set to use the PUCCH format 3, 4, or 5 may be set to higher layer signaling (3910).
- the PUCCH format 3 or 4 or 5 may be defined in the conventional LTE-A or LTE-A pro. If HARQ-ACK bundling is configured when the UE configures HARQ ACK / NACK information from the HARQ ACK / NACK information of the PDSCH transmitted first to the HARQ ACK / NACK information of the PDSCH most recently transmitted, the UE is transmitted at once ACK may be set only when all codewords on the PDSCH are ACK.
- Embodiment 3-4 provides a method for setting a DAI value for allowing a base station and a terminal to know an amount of HARQ ACK / NACK information transmitted by a terminal having a delay reduction mode set to the same value.
- the base station When the base station transmits uplink scheduling control information such as DCI format 0 or 4 to the terminal for uplink scheduling, the base station transmits the amount of HARQ ACK / NACK information to be transmitted by the terminal at the same time when the uplink transmission is performed. The value is included in the control information and transmitted to the terminal.
- uplink scheduling control information such as DCI format 0 or 4
- the base station transmits control information (ie, downlink scheduling control information, DCI) for downlink data transmission to the terminal, it indicates how many HARQ ACK / NACK the downlink transmission should be transmitted by the terminal in the serving cell c.
- DCI downlink scheduling control information
- a value is included in the control information and transmitted to the terminal. For example, when a PDSCH for transmitting a HARQ ACK / NACK corresponding to a UE to a base station is first transmitted in TTI n, a control signal for scheduling the PDSCH corresponds to 1.
- the control signal for scheduling the second PDSCH corresponds to 2 It will be possible to include a value.
- the number of downlink data transmissions indicated by the value may be predetermined. But more than 2 bits Value and Even for the value, the predetermined value can be changed by easy modification, and it may be possible to use 3 or 4 bits instead of 2 bits in the DCI for DAI information.
- Embodiment 3-5 provides a method of determining a timing at which a second signal is transmitted from a terminal to a base station by using an absolute value of the TA of the terminal set to the delay reduction mode.
- 40 is a diagram showing Embodiments 3-5.
- the base station sets a delay reduction mode to the terminal through higher layer signaling (4000) and calculates an absolute value of the TA of the corresponding terminal (4010).
- the base station reflects (added or subtracted) the absolute value of the TA value based on the TA value first transmitted to the terminal in the random access process when the terminal initially accesses (added or subtracted). Can be calculated.
- the terminal calculates the absolute value of the TA or the terminal corresponds to the signal received by the terminal at the start time of the nth TTI (ie, uplink) corresponding to the signal transmitted by the terminal (ie, downlink).
- the absolute value of TA can be calculated by subtracting the start time of the nth TTI.
- the absolute value of TA can be called NTA.
- the base station and the terminal may know the NTA, and may connect the NTA with the second signal transmission timing by using an arbitrary mapping. Using the mapping relationship, the base station and the terminal can find out the second signal transmission timing using NTA (4020), and the terminal transmits the second signal and the base station transmits the second signal at the second signal transmission timing.
- the signal may be received and decoded (4030).
- the second signal transmission timing k may be determined based on the NTA in the same manner as in Table 50 below.
- the equal sign of the inequality may be excluded or added, and x and y, which are k values according to NTA, may be set by the base station when the delay reduction mode is set, or x may be 4 and y may be fixed as 2 or 3 It may vary depending on the configuration. Table 50 is just an example, and the k value according to the NTA value may be determined in various ways.
- the offset value a may be determined based on the NTA instead of the k value for indicating the second signal transmission timing.
- K or a may also be determined based on the absolute length of time instead of the reference NTA.
- the k or a value may be changed according to the change amount of the TA value for a predetermined time instead of the NTA.
- Embodiments 3-6 provide a method of operating a terminal in which a CA using a delay reduction mode and one or more carriers is configured.
- a terminal configured with a delay reduction mode and one or more carriers or a terminal configured with a delay reduction mode performs blind decoding of a PDCCH or an EPDCCH only in a primary cell (PCell, primary cell).
- PCell primary cell
- the UE when the UE is configured to transmit HARQ ACK / NACK information of the PDSCH transmitted in subframe n during subframe n + 2 setting during the delay reduction mode, the UE restricts blind decoding of PDCCH or EPDCCH to only the main cell. Can be.
- Embodiments 3-7 provide a method in which a terminal supporting a delay reduction mode varies a DCI detection method according to a delay reduction mode setting.
- the delay reduction mode may mean transmission using shortened TTI.
- the DCI may include bits for a HARQ process number. For example, since 8 HARQ processes exist for a UE operating in a normal mode in an FDD system, a 3-bit HARQ process number exists in a DCI for scheduling to a corresponding UE. There may be a bit field for.
- a terminal operating with a shortened TTI may require a larger number of HARQ processes. For example, 16 HARQ processes may exist for a UE of a short TTI mode operating with 2 symbols or 3 symbols, and 4 bits are required to transmit HARQ process number information in DCI.
- the base station decides to share the HARQ process numbers in the normal mode and the shortened TTI mode, 16 HARQ processes can be used in the normal mode, and thus 4 bits of HARQ process number bits are also used for the DCI transmitted to the terminal in the normal mode. You need a field. Therefore, when the UE performs the shortened TTI operation because the delay reduction mode is set and does not perform the shortened TTI operation because the delay reduction mode is not set, the number of bits of the HARQ process number included in the DCI transmitted in the normal mode is different. You must judge.
- the base station When the base station transmits a DCI to the terminal for scheduling, the base station includes an x-bit HARQ process number information bit field if the delay reduction mode is set. If the delay reduction mode is not set, the base station includes a y-bit HARQ process number information bit field if the delay reduction mode is not set. Include it.
- the x and y may be the same but generally different. For example, x may be set to 3 bits and y may be set to 4 bits.
- the terminal When the UE detects the DCI for data transmission, if the delay reduction mode is set to itself, the terminal performs DCI decoding assuming the HARQ process number information bit field of x bits, and if the delay reduction mode is not set, the HARQ process of y bits DCI decoding is performed assuming a number information bit field.
- the x and y may be the same but generally different. For example, x may be set to 3 bits and y may be set to 4 bits.
- bit field for HARQ process number information has been described, but the length of other information of the DCI or the method of interpreting the DCI may be changed depending on whether the delay reduction mode is set.
- Embodiments 3-1 to 3-6 describe a method of a base station and a terminal for determining a transmission / reception timing of a second signal and a terminal transmission power and performing an operation according thereto. And the receiver, processor and transmitter of the terminal shall operate according to the respective embodiments.
- FIG. 41 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- the terminal of the present invention may include a terminal receiver 4110, a terminal transmitter 4120, and a terminal processor 4100.
- the terminal receiver 4110 and the transmitter 4120 of the terminal may be collectively referred to as a transceiver in the embodiment of the present invention.
- the transceiver may transmit / receive a signal with a base station, and the signal may include control information and data.
- the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the received signal.
- the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 4100, and transmit a signal output from the terminal processor 4100 through a wireless channel.
- the terminal processor 4100 may control a series of processes such that the terminal may operate according to the above-described embodiment of the present invention.
- the terminal receiving unit 4110 may receive a signal including second signal transmission timing information from the base station, and the terminal processing unit 4100 may control to interpret the second signal transmission timing. Thereafter, the terminal transmitter 4120 transmits the second signal at the timing.
- the base station of the present invention may include a base station receiver 4210, a base station transmitter 4220, and a base station processor 4200.
- the base station receiver 4210 and the base station transmitter 4220 may be collectively referred to as a transceiver in the embodiment of the present invention.
- the transceiver may transmit and receive a signal with the terminal.
- the signal may include control information and data.
- the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the received signal.
- the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 4200, and transmit a signal output from the base station processor 4200 through a wireless channel.
- the base station processor 4200 may control a series of processes to operate the base station according to the embodiment of the present invention described above. For example, the base station processor 4200 may control to determine the second signal transmission timing and generate the second signal transmission timing information to be transmitted to the terminal. Thereafter, the base station transmitter 4220 transmits the timing information to the terminal, and the base station receiver 4210 receives the second signal at the timing.
- the base station processor 4200 may control to generate a DCI including the second signal transmission timing information.
- the DCI may indicate that the second signal transmission timing information.
- FIG. 43 illustrates an example in which three services of 5G, eMBB 4300, URLLC 4310, and mMTC 4320 are multiplexed and transmitted in one system.
- a service may be simultaneously provided by providing scalability to a numerology such as subcarrier spacing when generating an OFDM signal.
- TTI transmission time interval
- the eMBB 4300, the URLLC 4310, and the mMTC 4320 are set to different TTIs 4330, respectively.
- 5G systems aim to design services that will be designed in the future so that they will not be restricted by the current system in consideration of future compatibility. In order to construct such a flexible system, it is oriented toward excluding as many various always-on signals that existed in the conventional LTE system or fixed signals transmitted and spread over the entire system band.
- a physical downlink control channel which is one of physical channels for transmitting downlink control information (DCI)
- DCI downlink control information
- a cell-specific reference signal (CRS) is used as a reference signal for decoding the PDCCH, and the CRS is a representative always present signal that is always transmitted regardless of the presence or absence of downlink traffic.
- CRS cell-specific reference signal
- the structure of the PDCCH currently used in the LTE system cannot be set flexibly. Therefore, if the existing structure of the PDCCH is used as it is in the 5G system, it may be difficult to support various services according to requirements or to secure future compatibility. will be.
- FIG. 44 illustrates a PDCCH 4400 and an Enhanced PDCCH 4410, which are downlink physical channels through which DCI of LTE is transmitted.
- the PDCCH 4400 is time division multiplexed (TDM) with the PDSCH 4420, which is a data transmission channel, and is transmitted over the entire system bandwidth.
- the region of the PDCCH 4400 is represented by the number of OFDM symbols, which is indicated to the UE by a control format indicator (CFI) transmitted through a physical control format indicator channel (PCFICH).
- CFI control format indicator
- PCFICH physical control format indicator channel
- the UE can decode the downlink scheduling assignment as soon as possible, and thus, the decoding delay for the downlink shared channel (DL-SCH), that is, the downlink data
- DL-SCH downlink shared channel
- the DCI transmitted on the PDCCH 4400 includes the following.
- Downlink scheduling assignment PDSCH resource designation, transmission format, HARQ information, spatial multiplexing related control information
- UL scheduling grant PUSCH resource designation, transmission format, HARQ information, PUSCH power control
- Different control information generally has different DCI message size and it is classified into different DCI format.
- Downlink scheduling assignment information is transmitted in DCI formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, and 2C
- the uplink scheduling grant is sent in DCI formats 0 and 4
- the power control command is DCI format 3 And 3A.
- One PDCCH 4400 carries one message having a form according to one of the DCI formats.
- each scheduling message is transmitted on each PDCCH 4400, so that a plurality of PDCCH 4400 transmissions are simultaneously performed.
- a Cyclic Redundancy Check (CRC) bit is added to the DCI message payload, and the CRC is scrambling with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the terminal.
- RNTI Radio Network Temporary Identifier
- Different RNTIs are used according to the purpose of the DCI message, for example, UE-specific data transmission, power control command or random access response.
- the RNTI is not explicitly transmitted but is included in the CRC calculation.
- Resource allocation of the PDCCH 4400 is based on a control-channel element (CCE), and one CCE has nine resource element groups (REGs), that is, 36 resource elements in total. , RE).
- the number of CCEs required for a particular PDCCH 4400 may be 1, 2, 4, or 8, depending on the channel coding rate of the DCI message payload. As such, different CCE numbers are used to implement link adaptation of the PDCCH 4400.
- the UE should detect a signal without knowing information about the PDCCH 4400.
- a search space indicating a set of CCEs is defined for blind decoding.
- the search space is composed of a plurality of sets according to the aggregation level of each CCE, which is not explicitly signaled and is implicitly defined through a function and a subframe number by the terminal identity.
- the UE decodes all possible PDCCHs that can be created from CCEs in the configured search space and processes information declared as valid for the UE through CRC verification.
- the search space is classified into a UE-specific search space and a common search space.
- a certain group of terminals or all terminals may search the common search space of the PDCCH to receive cell common control information such as dynamic scheduling or paging messages for system information.
- cell common control information such as dynamic scheduling or paging messages for system information.
- SIB System Information Block
- the common search space is defined only for DCI formats such as 0, 1A, 3, 3A or 1C, which is the smallest of the CCE aggregation levels of 4 and 8 and the DCI format, since system messages typically must reach the cell edge.
- the CRS 4430 is used as a reference signal for decoding the PDCCH.
- the CRS 4430 is transmitted every subframe over the entire band, and its scrambling and resource mapping are determined according to the cell identifier (ID).
- ID cell identifier
- the multiple antenna transmission scheme for the PDCCH 4400 is limited to open-loop transmit diversity.
- EPDCCH 4410 has been added as a physical channel for transmitting DCI.
- the EPDCCH 4410 is designed in a direction to satisfy the following requirements.
- the EPDCCH 4410 is transmitted by performing frequency division multiplexing (FDM) with the PDSCH 4420.
- the base station may properly allocate resources of the EPDCCH 4410 and the PDSCH 4420 through scheduling, thereby effectively supporting coexistence of data transmission and EPDCCH for the existing LTE terminal.
- the plurality of EPDCCHs 4410 constitutes one EPDCCH set, and the allocation of the EPDCCH sets is performed in units of physical resource block pairs (PRB pairs).
- PRB pairs physical resource block pairs
- the location information for the EPDCCH set is UE-specifically set and transmitted through radio resource control (RRC) signaling. Up to two EPDCCH sets may be configured for each UE, and one EPDCCH set may be configured to be multiplexed to different UEs at the same time.
- RRC radio resource control
- EPDCCH 4410 Resource allocation of EPDCCH 4410 is based on Enhanced CCE (ECCE), and one ECCE can be composed of 4 or 8 EREGs (Enhanced REGs), and the number of EREGs per ECCE is cyclic prefix (CP). It depends on the length and subframe settings.
- One EREG consists of 9 REs and there may be 16 EREGs per PRB pair.
- the EPDCCH transmission scheme is divided into localized / distributed transmission according to the RE mapping scheme of the EREG.
- the aggregation level of the ECCE may be 1, 2, 4, 8, 16, 32, which is determined by at least one of CP length, subframe setting, EPDCCH format, and transmission scheme.
- EPDCCH 4410 supports only terminal-specific search spaces. Therefore, the terminal that wants to receive the system message must examine the common search space on the existing PDCCH 4400.
- a demodulation reference signal (DMRS) 4440 is used as a reference signal for decoding the EPDCCH 4410.
- the EPDCCH 4410 supports transmission using up to four antenna ports. Since the DMRS 4400 is used, the precoding for the EPDCCH 4410 may be configured by the base station, and the UEs may perform decoding on the EPDCCH even if the UE does not know what precoding is used for the EPDCCH.
- the downlink control channel in the existing LTE system has been described.
- the downlink control channel in the 5G system should be designed differently from the downlink control channel in the LTE system.
- the control channel of the 5G system must satisfy the following requirements.
- the PDCCH is not suitable for the mMTC which mainly supports a narrow band because it is transmitted over the entire band. Since EPDCCH is transmitted during one subframe, it is not suitable for URLLC which requires very low delay time.
- control channels must be flexibly allocated in the time and frequency domains, but existing PDCCHs and EPDCCHs are difficult to allocate flexibly. Therefore, the design of a new control channel for 5G system is needed.
- control channel transmission may be understood that control information is transmitted on the control channel
- data channel transmission may be understood that data is transmitted on the data channel
- LTE and 5G systems will be the main target, but the main subject matter of the present invention does not significantly depart from the scope of the present invention in other communication systems having a similar technical background and channel form. It can be applied to a slight modification in the range that is not to the extent that it will be possible in the judgment of those skilled in the art of the present invention.
- the basic unit of time and frequency resources constituting the control channel may be named by a resource element group (REG) or a new radio resource element group (NR-REG). In the present invention, it is referred to as NR-REG for convenience.
- the NR-REG is composed of one OFDM symbol 4500 on the time axis and one frequency unit (FU, 4510) on the frequency axis.
- 1 FU is defined as a basic unit of frequency resources for performing scheduling from the base station to the terminal. For example, if scheduling is performed based on 12 subcarriers in a frequency domain, 1 FU may be defined as a size corresponding to 12 subcarriers (ie, 12 REs).
- the downlink control channel to be described in the present invention has a structure that can be flexibly allocated according to the requirements of the services requested by each terminal.
- control channel regions of various sizes may be set.
- a basic unit to which a control channel is allocated is CCE
- one CCE may include a plurality of NR-REGs. Referring to the NR-REG illustrated in FIG. 44, for example, if the NR-REG may be configured with 12 REs and 1 CCE is configured with 3 NR-REGs, it means that 1 CCE may be configured with 36 REs. do.
- the corresponding region may be composed of a plurality of CCEs, and a specific downlink control channel may be transmitted by being mapped to one or a plurality of CCEs according to an aggregation level (AL) in the control region.
- the CCEs in the control region are divided by numbers, and the numbers can be assigned according to a logical mapping method.
- the actual physical resource allocation for the CCE may be mapped in units of NR-REG, where a block interleaver and a cell-specific cyclic shift may be additionally used to strengthen the control channel.
- the data channel and the control channel may be TDM within one subframe by assuming that the time axis basic unit is 1 OFDM symbol.
- the control channel By placing the control channel ahead of the data channel, the user's processing time can be reduced, making it easier to meet latency requirements.
- the base unit of the frequency axis of the control channel By setting the base unit of the frequency axis of the control channel to 1 FU, it is possible to perform the FDM between the control channel and the data channel more efficiently. If the basic unit of the frequency axis is composed of any number of subcarriers smaller than 1 FU, there is a disadvantage in that the frequency axis start point for the scheduled data must be indicated in subcarrier units.
- the basic unit of the downlink control channel illustrated in FIG. 45 may include a region 4520 to which DCI is mapped and a region to which DMRS 4530, which is a reference signal for decoding the same, is mapped.
- the DMRS 4530 may be efficiently transmitted in consideration of the overhead of RS allocation.
- DMRS may be turned on or off according to an antenna port configuration used by a base station or a method of assigning a downlink control channel.
- the DMRS 4530 may or may not be transmitted in a specific control channel basic unit, that is, NR-REG. If the DMRS 4530 is not transmitted, the corresponding area may be used for DCI mapping.
- TTI 1 4620 is composed of 14 OFDM symbols
- TTI 2 4650 is composed of 7 OFDM symbols
- TTI 3 4680 is composed of 2 OFDM symbols.
- Figure according to 46 terminals having a has a total of three OFDM symbols (4630) # 1 (4600) (for transmitting and receiving a signal that is used for TTI 1) having a TTI first terminal (User Equipment, UE), TTI 2 # 2 ( A total of two OFDM symbols 4660 are set in 4640, and a total of one OFDM symbol 4680 is set in a downlink control channel (CCH) in the terminal # 3 4670 having TTI 3 .
- FIG. 46 illustrates an example in which a downlink control channel is configured differently for each terminal, the downlink control channel may be configured in a unit of a terminal or a terminal group in consideration of the complexity and efficiency of the control channel configuration. In other words, all the terms used in the present invention can be interpreted as a term having a terminal group or a similar meaning.
- a TU (Time Unit) 4610 shown in FIG. 46 indicates a basic time unit for scheduling.
- the TU 4610 may be defined by a time unit such as a transmission time interval (TTI), a subframe, a slot, a mini-slot, or the like.
- TTI transmission time interval
- 1 TU is assumed to be 14 OFDM symbols.
- a subframe corresponding to 1 TTI 1 is scheduled for the terminal # 1 (4600) and the terminal # 2
- a subframe corresponding to 2 TTI 2 may be scheduled, and a subframe corresponding to 7 TTI 3 may be scheduled for the UE # 3 4670.
- control channel per TTI is configured in the case of the terminal # 1 4600 and the terminal # 2 4640, but one control channel per TTI is configured in the terminal # 3 4670.
- control information for a plurality of TTIs is bundled and transmitted in a control channel allocated to the terminal # 3 4670, and the scheduling for a plurality of TTIs may be instructed at a time in a control channel received before the plurality of TTIs. .
- control channel region in FIG. 46 is just one example, and the control channel region may be set differently according to the TTI and various other system parameters.
- FIG. 47 is a diagram illustrating an example of time and frequency axis resource configuration for a downlink control channel according to embodiment 4-1 of the present invention.
- time axis resources are represented in units of OFDM symbols and are shown by 1 TU 4780, and frequency axis resources are shown by one subband 4740 in units of 1 FU 4730.
- frequency axis resources are shown by one subband 4740 in units of 1 FU 4730.
- control channels CCH # 1 and 4750 of the UE # 1, the control channels CCH # 2 and 4760 of the UE # 2, and the control channel 4770 of the UE # 3 are different not only in time resources but also in frequency resources. Can be set. Allocation of control channels is made through concatenation of the basic units shown in FIG. As a result, the control channel region is provided in a specific pattern on the time and frequency axis.
- the base station may indicate the information on the configured control channel pattern to each terminal through the RRC signaling.
- the control channel pattern may be indicated to each terminal through control signals transmitted to a plurality of terminals, such as common control signaling or UE group control signaling.
- the control channel pattern may be implicitly indicated through a function using various system parameters, for example, RNTI, TTI length, service type, and the like.
- the resource set as the control channel may be used for data transmission when there is no control information to be transmitted, thereby further increasing resource efficiency.
- a specific base station and terminal operation required will be described below.
- FIG. 48 transmission of UE # 1 4800 and UE # 2 4810 having different TTI lengths is illustrated.
- the TTI lengths of the terminal # 1 4800 and the terminal # 2 4810 are set to TTI 1 4810 and TTI 2 4830, respectively.
- the PDSCH # 1 4840 of the UE # 1 4800 is allocated to some of the subbands.
- a part of a resource allocated to PDSCH # 1 4840 is a part of a preset resource for CCH # 2 4850, which is a control channel existing in a second TTI of UE # 2 4820. Can overlap.
- the CCH # 2 4850 may be deactivated and the PDSCH # 1 4840 may be successfully decoded by the UE # 14820.
- control information to be transmitted through the CCH # 2 1850 exists, a collision between the PDSCH # 14840 and the CCH # 24850 may occur, and thus, the operation of the base station and the terminal is required.
- the base station is a resource where the PDSCH # 1 4840 and the CCH # 2 4850 collide with each other.
- CCH # 2 4850 may be protected by puncturing a portion of PDSCH # 14840 with respect to the CCH # 2. In this case, puncturing means that the data channel is not mapped to the resource where the data channel and the control channel collide.
- 49 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-1 of the present invention.
- the base station configures each control channel region and transmits information on the set control channel pattern to each terminal through RRC signaling or implicit method.
- the base station determines whether a preset control channel exists in a resource to which the PDSCH is to be allocated. If the control channel region does not exist, the PDSCH is allocated as it is (4940). If the control channel region exists, it is determined once again whether the control channel of the region is used in step 4920. If the control channel of the corresponding area is activated, a part of the PDSCH of the corresponding area is punctured and scheduled in step 4930. Even when the control channel is configured, if the control channel of the corresponding region is not used, the PDSCH may be scheduled to the corresponding resource as it is (4940).
- step 4950 the terminal receives the control channel region configuration information from the base station.
- step 4960 the UE decodes its control channel to obtain scheduling information for the PDSCH.
- step 4970 the UE may perform decoding on the PDSCH. In this case, since the PDSCH is not simply mapped to the collided resource, the terminal may receive and decode the control channel on a preset control channel region and receive and decode the PDSCH on a resource that does not overlap the control channel.
- the base station may avoid collision with the control channel by re-scheduling the PDSCH # 14840.
- the base station may allocate the PDSCH # 1 4840 only to an area that avoids the control channel of another terminal that is activated during the resource allocation of the PDSCH # 1 4840.
- FIG. 50 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-1-2 of the present invention.
- the base station configures the control channel region in step 5000 and transmits it to the terminal.
- the base station determines whether the resource for scheduling the PDSCH overlaps with the preset control channel region (5010). If it does not overlap, the base station may schedule the PDSCH as it is (5040). If there is an overlapping resource, it is determined whether the control channel of the corresponding region is used (5020). If the control channel of the corresponding area is used, another resource for PDSCH allocation is searched for in step 5030. If the control channel of the corresponding area is not in use, PDSCH allocation is performed in step 5040.
- the UE receives configuration information on the control channel region in step 5050 and obtains scheduling information on its PDSCH from downlink control information obtained by decoding its control channel in step 5060.
- the UE decodes the PDSCH.
- the base station maps the PDSCH to a resource that does not collide and transmits downlink control information for scheduling the PDSCH to the terminal, so that the terminal can decode the PDSCH based on the downlink control information. This may be a newly mapped PDSCH.
- the base station determines the rate for the PDSCH # 1 4840 in consideration of the amount of resources in which the PDSCH # 1 4840 and the CCH # 2 4850 collided.
- resources of PDSCH # 1 4840 may be allocated such that CCH # 2 4850 does not use the allocated resources.
- successful decoding of PDSCH # 14840 requires additional signaling indicating that PDSCH is rate matched so that some of the resources are not used.
- Each user can know the information on the control channel pattern set in the current subframe from the RRC signaling of the base station.
- the base station may transmit the DCI of the terminal # 1 by including an indicator indicating whether to use a control channel of another terminal in the region where the PDSCH of the terminal # 1 is allocated, for example, CCH # 2 4850.
- the UE may know where resources are not used in the region in which its PDSCH is allocated through an indicator indicating whether the control channel is used by another UE received through the preset control channel pattern and the DCI. Accordingly, the UE may perform decoding assuming that the PDSCH is allocated to the remaining portions except for the corresponding region.
- FIG. 51 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-1-3 of the present invention.
- the base station configures the control channel region and transmits it to the terminal (5100).
- the base station determines whether a control channel is set in an area to which the PDSCH is scheduled (5105), and if so, determines whether the control channel is used (5110). If there is no collision between the PDSCH and the control channel resource, or if the control channel is not used even if resources conflict, the base station schedules the PDSCH as it is (5120). If the control channel of the corresponding area is in use, in step 5115, the base station performs rate matching on data to be transmitted except for the corresponding area to schedule the PDSCH.
- the base station transmits an indicator of whether the control channel is used to the terminal for the region where the PDSCH and the control channel collide. In the case where there is no collision area between the PDSCH and the control channel, it is the same as no active control channel, so an indicator of whether the control channel is used may be used as it is.
- the UE receives configuration information on the control channel region (5150) and obtains scheduling information on the PDSCH from its control channel (5155).
- the UE determines whether a control channel of another UE is set among resources for which its PDSCH is scheduled based on the configuration information on the control channel region. If the control channel of the other terminal does not exist, the PDSCH is received and decoded as it is according to the data scheduling information (5180). If there is a control channel of another terminal, information on whether the corresponding control channel is used is obtained through an indicator indicating whether to use the control channel existing in the corresponding region (5165).
- step 5170 if the UE receives an indicator indicating that the control channel of the corresponding area is in use, the terminal receives and decodes (5175) the PDSCH except the corresponding area according to the data scheduling information. If an indicator indicating that the control channel of the corresponding area is not in use is received, the UE performs PDSCH decoding as it is (5180).
- 52 is a diagram illustrating an example of downlink transmission according to embodiment 4-1 of the present invention.
- FIG. 52 an example of PDSCH transmission of a terminal 5210 having a length of TTI 1 5200 is illustrated.
- the transmitter ie, the base station
- the transmitter may use the resource to transmit the PDSCH.
- the starting point 5220 of the PDSCH may vary according to the location of the frequency resource to which the PDSCH is allocated.
- the start point of the PDSCH 1 (5230) is the fourth OFDM symbol.
- the third OFDM symbol is used, and in the case of PDSCH 3 5250, the second OFDM symbol is used as a starting point of the PDSCH.
- the control channel 5260 is allocated to three OFDM symbols in the time axis, the downlink control channel according to the embodiment 4-1 of the present invention supports the FDM with the PDSCH, so that the control channel 5260 is in one OFDM symbol. And data channels may exist simultaneously. Accordingly, in the example of FIG. 52, the point where the PDSCH can be started may be a 1, 2, 3 or 4th OFDM symbol. In order to successfully decode the PDSCH, the UE needs to know where the PDSCH starts, and thus requires additional BS and UE operations.
- the base station schedules the PDSCH, it is possible to always allocate the resources of the PDSCH to the OFDM symbol following the control channel of the terminal. In this case, since the UE may assume that its PDSCH always comes after the control channel, the UE may perform decoding on the PDSCH without signaling an additional PDSCH start point.
- 53 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-4 of the present invention.
- the base station procedure of the present invention will be described with reference to FIG. 53A.
- the base station sets a control channel region and transmits information about the control channel region to the terminal.
- the base station schedules the PDSCH to the next symbol of the OFDM symbol to which the control channel is allocated in consideration of the time domain in which the control channel of the terminal is set. For example, when the control channel of the terminal is set to n OFDM symbols, the PDSCH may be allocated from the n + 1 th symbol. Thereafter, the base station transmits data on the PDSCH (5320).
- step 5350 the terminal receives the control channel region configuration information from the base station.
- the UE obtains frequency axis scheduling information for the PDSCH from its control channel (5360), and assumes that the start point of the PDSCH is the OFDM symbol next to its control channel, and then receives and decodes the PDSCH (5370).
- the base station may transmit to the terminal by adding an indicator for the start point of the PDSCH to the DCI providing the scheduling information of the PDSCH.
- the candidate group of the starting point of the PDSCH is determined by the size of the control channel time domain of the corresponding user. For example, if a control channel is allocated to n OFDM symbols, PDSCH is 1, 2,... The n + 1 th OFDM symbol may be started. As a result, each user may receive an indicator for the starting point of the PDSCH of the different size.
- the DCI format may be newly defined to add message bits having different sizes for the PDSCH start point.
- the number of message bits for the PDSCH start point may be fixed and no extra bits may be used.
- the number of message bits for the PDSCH start point may be Ceil (log 2 (n max +1)).
- Ceil (x) means the ceiling function and is defined as a function corresponding to the smallest integer that is greater than or equal to x for the input value x.
- n max represents the maximum number of OFDM symbols that can be allocated to the control channel.
- the existing DCI format can be used as it is without defining additional DCI formats.
- 54 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-1-5 of the present invention.
- the base station sets the control channel region and then transmits the corresponding information to the terminal (5400).
- the base station may perform scheduling for the PDSCH, and in step 5420, the indicator for the PDSCH start point may be added to the DCI and transmitted.
- the base station then transmits the scheduled data on the PDSCH (5430).
- the terminal receives control channel region configuration information (5450) and obtains frequency axis scheduling information for the PDSCH from its control channel (5460).
- the UE may additionally acquire information about a start point, which is time axis scheduling information on the PDSCH, and may perform reception and decoding on the PDSCH based on the previous information (5480).
- DCI format 2C includes scheduling assignment information for a PDSCH supporting closed-loop multi-antenna transmission for up to 8 layers. More specifically, the DCI format 2C includes the following message.
- RS configuration information antenna port, scrambling sequence, number of layers
- the terminal When transmitting downlink data, the terminal decodes a control channel first to obtain the above control information. From the resource block allocation information, the UE can know a location to which its PDSCH is allocated and can decode data based on MCS and other multi-antenna configuration information.
- Embodiment 4-2 is a diagram showing Embodiment 4-2 of the present invention.
- the downlink control channel according to embodiment 4-2 of the present invention is composed of a pre-control channel (Pre-CCH) and a post-control channel (Post-CCH).
- the subframe structure of UE # 1 5510 shows an example in which a control channel is allocated when the length of TTI 1 5500 is equal to 1 TU 5590.
- Pre-CCH # 1 5540 of UE # 15510 may be allocated to the first OFDM symbol
- Post-CCH # 1 5550 may be allocated to the second and third OFDM symbols. have.
- one control channel may be set during one TU because the length of the TTI and the length of the TU are the same.
- the subframe structure of UE # 2 5530 shows an example in which a control channel is allocated when the length of TTI 2 5520 is smaller than 1TU.
- Pre-CCH # 2 5560 of UE # 2 5530 is allocated to the first OFDM symbol of the first TTI, but not to the second TTI.
- Pre-CCH # 2 5560 of UE # 25530 one is set for 1 TU like UE # 1 5510.
- Post-CCH 1 # 2 (5570) is assigned to the second OFDM symbol of the first TTI
- Post- CCH 2 # 2 5550 is assigned to the first and second OFDM symbols of the second TTI, respectively.
- the pre-control channel may be transmitted through the first OFDM symbol of 1 TU in the same way.
- FIG. 56 illustrates an example of time and frequency allocation of a control channel with respect to UE # 1 5510 and UE # 25530 considered in FIG. 55.
- Pre-CCH # 1 5620, a pre-CCH # 1 5620 of the UE # 1 5600, and Pre-CCH # 2 5630, a pre-CCH # 2 5630, of the pre-CCH # 2 of the UE # 25610 are sub-stations of the first OFDM symbol. May be allocated to some area of the band.
- the line control channels 5620 and 5630 shown in FIG. 56 have the same structure as the control channel in the embodiment 4-1 of the present invention.
- the pre-control channel may be set to different sizes in consideration of various system parameters corresponding to each terminal or terminal group based on the same basic unit of resource allocation as described in FIG. 45.
- the preferred form of time-base resource allocation of the pre-control channel is to be allocated to the minimum OFDM symbol. This allows the reception of the pre-control channel to be performed in the shortest possible time to reduce the delay time to the control channel decoding and to reduce the complexity of decoding by reducing the size of the area to be examined for blind decoding of the terminal There is this.
- the line control channels 5620 and 5630 of the terminal # 1 5600 and the terminal # 2 5610 are all allocated to one OFDM symbol. Frequency axis allocation of the pre-control channels 5620 and 5630 may be set to different sizes in a predetermined region of the subband according to the requirements of the terminal as in the embodiment 4-1.
- the pre-control channel may be allocated independent resources while the post-control channel is transmitted through the PDSCH (ie, in the data region).
- the Post-CCH # 1 5640 of the UE # 1 5600 is allocated to the same frequency resource as the PDSCH # 1 5650.
- Post-CCH 1 # 2 5660 is allocated to the same frequency resource as PDSCH 1 # 2 5670
- Post-CCH 2 # 2 5580 is PDSCH 2 # 2.
- the post-control channel may be mapped and transmitted to a partial region of the PDSCH, which is a data channel.
- the control channel according to embodiment 4-2 of the present invention is composed of two control channels, and the mapping method of each control channel is also different from each other.
- the embodiment 4-2 as in the embodiment 4-1, it is possible to variably allocate a control channel according to the service requirements of each terminal.
- the resource may be allocated to various positions according to whether the PDSCH is allocated instead of being preset in a specific time and frequency resource like the pre-control channel. Through this, the post-control channel can be freely allocated without restriction on scheduling for the PDSCH in the remaining parts except for the resource to which the pre-control channel is allocated. Therefore, more flexible system operation may be possible than in the case of the embodiment 4-1.
- the base station sets the control area and signals the terminal to the terminal so that each terminal knows the location of its control area. This may require instructions on resource allocation. Therefore, specific base station and terminal operations for setting the pre-control channel and the post-control channel are required, and various embodiments thereof will be described below.
- FIG. 57 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-1 of the present invention.
- the entire DCI 5700 may be divided into DCI 0 5710 and DCI 1 5720.
- DCI 0 5710 includes resource block allocation information 5730 for the PDSCH
- DCI 1 5720 includes data decoding and terminal operations such as other MCS, a new data indicator, and a redundancy version.
- the DCI 0 5710 may be transmitted through the pre-control channel 5740 and the DCI 1 5720 may be transmitted through the post-control channel 5750.
- the pre-control channel 5740 includes resource allocation information 5730 for the PDSCH. Accordingly, the UE can know the position of the PDSCH by decoding the pre-control channel, which is the same as that of the position of the post-control channel 5750 transmitted through the PDSCH. As a result, the terminal does not need to be transmitted in a predetermined region different from the pre-control channel because the terminal is instructed by the pre-control channel 5740 resource allocation information for the post-control channel (5750). Therefore, a more flexible control channel can be set.
- FIG. 58 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-2-1 of the present invention.
- the base station performs area setting and information transmission on the pre-control channel.
- the base station may generate DCI 0 and DCI 1 through DCI partitioning.
- the base station transmits DCI 0 to the terminal through a preset control channel.
- the base station transmits DCI 1 to the terminal through a back control channel mapped to the scheduled PDSCH.
- the terminal receives the configuration information for the pre-control channel area.
- the UE decodes the pre-control channel to receive DCI 0 and obtains scheduling information for the PDSCH therefrom.
- the UE may receive the DCI 1 by decoding the post-control channel allocated to some region of the scheduled PDSCH and obtain the remaining downlink control information therefrom.
- the terminal receives and decodes the PDSCH according to the obtained downlink control information (5880).
- FIG. 59 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-2 of the present invention.
- FIG. 59 four DCIs 5900, 5902, 5904, and 5906 are divided.
- FIG. 59 may be an example of a case where a control channel required for this is transmitted four times in a situation where a service corresponding to 4 TTIs is to be transmitted during 1 TU.
- four DCIs may be divided into one DCI 0 5920 and four DCI 1s 5922, 5924, 5926, and 5928.
- Both PDSCH resource allocation information 5910 in the first DCI 5900 and PDSCH resource allocation information 5912 in the second DCI 5502 may be split into a DCI 0 5920 message.
- the third DCI PDSCH resource allocation information (5916) in the PDSCH resource allocation information (5914) and fourth DCI (5906) in the (5904) is divided into DCI 1, 2 (5924).
- the remaining DCI information except for resource allocation information for four PDSCHs is a message of DCI 1,1 (5922), DCI 1,2 (5924), DCI 1,3 (5926), and DCI 1,4 (5928), respectively. It can be divided into
- DCI 0 5920 is mapped to a pre-control channel 5930 transmitted to the first TTI and DCI 1,1 5922 is mapped to a post-control channel 5932 transmitted to the first TTI.
- DCI 1,2 (5924), DCI 1 , 3 (5926), DCI 1, 4 (5926) after which control channel Post-CCH 2 (5934), Post-CCH 3 for the TTI that follows, respectively (5936 ), And is mapped to Post-CCH 4 5938 and transmitted.
- the important point here is that both the pre-control channel and the post-control channel are transmitted only in the first TTI and only the post-control channel in the subsequent TTI. This may be considered as the case of the terminal # 2 (5530 and 5610) in Figures 55 and 56 described above.
- the fourth embodiment 2-2-2 illustrated in FIG. 59 is a case where several control channels may be transmitted in one TU, unlike the embodiment 4-2-1 described above. In this case, it is important to properly divide the multiple DCIs transmitted during 1 TU.
- resource allocation information for the PDSCH may be mapped not only to DCI 0 (mapped to pre-control channel) but also to DCI 1 (mapped to post-control channel). Since the number of, if both the resource allocation information for all the PDSCH that follows in the service transmission for the TTI mapped to DCI 0 is too large overhead (overhead) that are weighted for DCI 0 exceed the transmission capacity provided by the DCI 0 It may be.
- Figure 59 this is illustrated by considering the example of transmitting by dividing the resource allocation information of the PDSCH corresponding to the third and fourth TTI as DCI 1, 2 (5924).
- the terminal may know resource regions of the pre-control channel 5930 from the Post-CCH 1 5932 and the Post-CCH 2 5934 and the Post-CCH 2 5934. ), The resource regions of Post-CCH 3 (5936) and Post-CCH 4 (5938) can be known.
- the UE can successfully decode a total of four PDSCHs through other control signals.
- 60 is a diagram illustrating a base station and a terminal procedure according to Embodiment 4-2-2 of the present invention. 60 is described on the assumption that K PDSCHs transmitted during 1 TU are transmitted.
- the base station procedure of the present invention will be described with reference to FIG. 60A.
- the base station sets an area for the pre-control channel and transmits information on the same to the terminal.
- the base station generates one DCI 0 and K DCI 1 messages through DCI partitioning.
- the base station transmits a DCI 0 message through a pre-configured pre-control channel (6020) and transmits DCI 1, k through the post-control channels mapped to K PDSCH k (6030).
- the terminal receives region setting information for the pre-control channel.
- the UE to acquire the rest of the control information for each PDSCH k receives the DCI 1, k message therefrom from the rear control channel of each PDSCH k, and in step 6065 the UE using the control information for decoding of the PDSCH k To perform.
- the terminal determines whether k equals to n (6070). That is, the terminal determines whether all PDSCHs are decoded.
- the UE acquires scheduling information for the PDSCH k that exists afterwards from the last PDSCH k that knows the scheduling information, that is , DCI 1, m present in the PDSCH m (6075).
- the UE repeats the above process until decoding of all PDSCHs is completed. If decoding of all PDSCHs is completed, the UE ends the operation.
- FIG. 61 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-3 of the present invention.
- FIG. 61 is a diagram showing an example of DCI partitioning according to Embodiment 4-2-3 of the present invention.
- resource allocation information 6110 and reference signal (RS) configuration information (or multi-antenna configuration information 6120) for the PDSCH among the entire DCI 6100 may be divided.
- An example in which resource allocation information 6110 and multi-antenna configuration information 6120 for the PDSCH are divided into DCI 0 6130 and the remaining control information are divided into DCI 1 6140 is illustrated.
- the DCI 0 6130 is mapped and transmitted to the pre-control channel 6150, and the DCI 1 6140 is mapped to the post-control channel 6160 and transmitted.
- RS configuration information as well as resource allocation information for the PDSCH is used. Is also divided by DCI 0 .
- the RS configuration information may include information such as an antenna port, a scrambling sequence, the number of layers, and the like as described above.
- FIG. 62 is a diagram showing an example of a frame structure according to Embodiment 4-2-3 of the present invention.
- FIG. 62 shows a post-control channel 6200, a PDSCH 6210 through which the post-control channel is transmitted, and a DMRS 6220 and a pre-control channel 6230, which are reference signals required for decoding the post-control channel 6200.
- the downlink control channel described in the present invention may basically support decoding based on DMRS.
- the pre-control channel 6230 is set to independent time and frequency resources, a separate reference signal for the decoding of the pre-control channel 6230 is required. If the post-control channel 6200 is transmitted in the same manner as the pre-control channel 6230, a separate DMRS for the post-control channel 6200 is required.
- the after control channel 6200 since the after control channel 6200 is mapped and transmitted to a partial region of the PDSCH, the after control channel may be transmitted in the same manner as the PDSCH.
- the UE can decode the post control channel 6200 by sharing and using the DMRS 6220 of the PDSCH 6210 without setting individual DMRSs in the post control channel 6200.
- there is no need for an additional RS for the post-control channel 6200 there is an advantage that RS overhead can be reduced.
- the RS configuration information is divided into DCI 0 and transmitted through the pre-control channel 6230, and the UE decodes the pre-control channel 6230 to obtain DMRS configuration information for decoding the post-control channel.
- 63 is a diagram illustrating a base station and a terminal procedure according to embodiment 4-2-3 of the present invention.
- step 6300 the base station sets an area for the pre-control channel and transmits information to the terminal.
- step 6310 DCI is divided to generate DCI 0 and DCI 1 .
- the base station transmits DCI 0 through a pre-control channel (6320) and transmits DCI 1 through a post-control channel of the scheduled PDSCH (6330).
- the terminal receives the pre-control channel region setting information.
- the terminal receives DCI 0 from its pre-control channel and obtains scheduling information and RS configuration information for its PDSCH therefrom (6360).
- the UE may perform decoding on the post-control channel using RS configuration information obtained from DCI 1 .
- the UE may acquire DCI 1 from the post-control channel and through this, obtain remaining control information for the PDSCH (6380), and then perform decoding on the PDSCH based on the control information (6390).
- RNTI Radio Network Temporary Identifier
- the UE monitors the PDCCH to receive the DCI, perform decoding, and then determine whether the decoded DCI has an error through CRC determination.
- the entire DCI is divided into DCI 0 and DCI 1 so as to control the pre-control channel and the post-control, respectively. Can be transmitted over a channel.
- the UE should be able to check whether there is an error with respect to DCI 0 received through the pre-control channel and DCI 1 received through the post-control channel. Therefore, a CRC for DCI 0 (named CRC 0 ) and a CRC for DCI 1 (named CRC 1 ) must be inserted respectively.
- the following methods are proposed for a method of inserting a CRC.
- the base station may insert a CRC 0 and inserts the CRC 1 with respect to the payload bit sequence of DCI 1, respectively with respect to the payload bit sequence of 0 DCI.
- error checking for each DCI message divided and transmitted is performed independently for DCI 0 and DCI 1 . More specifically, if it is confirmed that an error has occurred through CRC 0 , this means that there is an error in the decoded DCI 0 , and if it is confirmed that an error has occurred through CRC 1 , it indicates an error in the decoded DCI 1 . It means that there is.
- the values of L 0 and L 1 differ from each other in consideration of various system parameters (for example, requirements of a pre-control channel and a post-control channel). Can be set.
- the base station may scramble using all or part of RNTI according to L 0 and L 1 values.
- the second method with respect to the payload bit sequence of DCI 0 Insert a CRC 0, and then generates a CRC 1 with respect to the entirety of the payload bit sequence DCI 0 payload bit sequence by the DCI 1 in use this as the CRC of DCI 1 Can be.
- CRC 0 may be used to check whether an error occurs for DCI 0
- CRC 1 may be used to check whether an error occurs for all DCI bits (ie, DCI 0 + DCI 1 ). More specifically, when CRC 0 confirms that an error has occurred, it means that decoded DCI 0 has an error, and when CRC 1 confirms that an error has occurred, it means that it is decoded DCI 0 or DCI. 1 means there is an error.
- the second method is more robust against false alarms for DCI 0 because error checking for DCI 0 is performed twice. In this case, a false positive means that an error has occurred but the terminal determines that an error has not occurred.
- DCI 0 actually generates an error but no error is detected by acknowledgment of CRC 0 , that is, when a false positive occurs for DCI 0
- the UE subsequently decodes DCI 1 and checks whether it is an error with CRC 1 . Will be confirmed.
- CRC 1 detects all three cases of an error in DCI 0 , an error in DCI 1 , and an error in both DCI 0 and DCI 1 . Therefore, when the second method is applied, even if a false positive occurs in the pre-control channel, the terminal can check the error once more through the post-control channel decoding.
- the values of L 0 and L 1 differ from each other in consideration of various system parameters (e.g., requirements of pre- and post-control channels). Can be set.
- the base station may scramble using all or part of the RNTI according to L 0 and L 1 values.
- Terminals and base stations for carrying out the above embodiments of the present invention are shown in FIGS. 64 and 65, respectively.
- a method of transmitting and receiving a base station and a terminal for performing a setting and transmission / reception operation for a corresponding downlink control channel is described. Should be operated accordingly.
- FIG. 64 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- a terminal of the present invention may include a terminal processor 6400, a terminal receiver 6410, and a terminal transmitter 6620.
- the terminal processor 6400 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present invention.
- the terminal operation may be controlled differently according to the configuration of the downlink control channel according to an embodiment of the present invention.
- the terminal receiver 6410 and the terminal transmitter 6420 may be collectively referred to as a transceiver in the embodiment of the present invention.
- the transceiver may transmit and receive a signal with the base station.
- the signal may include control information and data.
- the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the received signal.
- the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 6400, and transmit a signal output from the terminal processor 6400 through the wireless channel.
- the base station of the present invention may include a base station processor 6500, a base station receiver 6510, and a base station transmitter 6520.
- the base station processor 6500 may control a series of processes to operate the base station according to the above-described embodiment of the present invention. For example, it is possible to control the operation of the base station differently according to the configuration of the downlink control channel according to an embodiment of the present invention. In addition, scheduling of the downlink control channel and the data channel of the present invention can be performed and configuration information on the downlink control channel can be instructed to the terminal.
- the base station receiver 6510 and the base station transmitter 6520 may be collectively referred to as a transceiver unit in the embodiment of the present invention.
- the transceiver may transmit and receive a signal with the terminal.
- the signal may include control information and data.
- the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying and down-converting the received signal.
- the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 6500, and transmit a signal output from the base station processor 6500 through a wireless channel.
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Abstract
Description
Claims (15)
- 이동 통신 시스템의 기지국의 방법에 있어서,단말로 하이브리드 ARQ(HARQ) 타이밍에 관련된 제1 정보를 상위 계층 시그널링으로 전송하는 단계;상기 단말로 스케줄링 정보 및 상기 HARQ 타이밍에 관련된 제2 정보를 전송하는 단계;상기 단말로 상기 스케줄링 정보에 의해 스케줄링되는 데이터를 전송하는 단계; 및상기 제1 정보 및 상기 제2 정보를 기반으로 결정된 상기 HARQ 타이밍에 따라 상기 데이터에 대한 긍정 수신 확인 또는 부정 수신 확인(ACK/NACK) 정보를 상기 단말로부터 수신하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 제1 정보는 상기 HARQ 타이밍에 관련된 복수의 가능한 값을 지시하며 상기 제2 정보는 상기 복수의 가능한 값 중 하나의 값을 지시하는 정보인 것을 특징으로 하는 방법.
- 제2항에 있어서,상기 HARQ 타이밍에 관련된 가능한 값은 상기 데이터가 전송되는 전송 시간 구간과 상기 ACK/NACK 정보가 수신되는 전송 시간 구간의 차이를 직접 지시하는 값 또는 상기 차이에 적용되는 오프셋(offset) 값인 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 ACK/NACK 정보의 포맷은 상기 ACK/NACK 정보에 해당되는 상기 데이터의 수를 기반으로 결정되는 것을 특징으로 하는 방법.
- 이동 통신 시스템의 단말의 방법에 있어서,기지국으로부터 하이브리드 ARQ(HARQ) 타이밍에 관련된 제1 정보를 상위 계층 시그널링으로 수신하는 단계;상기 기지국으로부터 스케줄링 정보 및 상기 HARQ 타이밍에 관련된 제2 정보를 수신하는 단계;상기 기지국으로부터 상기 스케줄링 정보에 의해 스케줄링되는 데이터를 수신하는 단계; 및상기 제1 정보 및 상기 제2 정보를 기반으로 결정된 상기 HARQ 타이밍에 따라 상기 데이터에 대한 긍정 수신 확인 또는 부정 수신 확인(ACK/NACK) 정보를 상기 기지국으로 전송하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 제1 정보는 상기 HARQ 타이밍에 관련된 복수의 가능한 값을 지시하며 상기 제2 정보는 상기 복수의 가능한 값 중 하나의 값을 지시하는 정보인 것을 특징으로 하는 방법.
- 제6항에 있어서,상기 HARQ 타이밍에 관련된 가능한 값은 상기 데이터가 수신되는 전송 시간 구간과 상기 ACK/NACK 정보가 전송되는 전송 시간 구간의 차이를 직접 지시하는 값 또는 상기 차이에 적용되는 오프셋(offset) 값인 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 ACK/NACK 정보의 포맷은 상기 ACK/NACK 정보에 해당되는 상기 데이터의 수를 기반으로 결정되는 것을 특징으로 하는 방법.
- 이동 통신 시스템의 기지국에 있어서,신호를 송수신하는 송수신부; 및단말로 하이브리드 ARQ(HARQ) 타이밍에 관련된 제1 정보를 상위 계층 시그널링으로 전송하고, 상기 단말로 스케줄링 정보 및 상기 HARQ 타이밍에 관련된 제2 정보를 전송하고, 상기 단말로 상기 스케줄링 정보에 의해 스케줄링되는 데이터를 전송하고, 상기 제1 정보 및 상기 제2 정보를 기반으로 결정된 상기 HARQ 타이밍에 따라 상기 데이터에 대한 긍정 수신 확인 또는 부정 수신 확인(ACK/NACK) 정보를 상기 단말로부터 수신하도록 제어하는 제어부를 포함하는 것을 특징으로 하는 기지국.
- 제9항에 있어서,상기 제1 정보는 상기 HARQ 타이밍에 관련된 복수의 가능한 값을 지시하며 상기 제2 정보는 상기 복수의 가능한 값 중 하나의 값을 지시하는 정보인 것을 특징으로 하는 기지국.
- 제10항에 있어서,상기 HARQ 타이밍에 관련된 가능한 값은 상기 데이터가 전송되는 전송 시간 구간과 상기 ACK/NACK 정보가 수신되는 전송 시간 구간의 차이를 직접 지시하는 값 또는 상기 차이에 적용되는 오프셋(offset) 값인 것을 특징으로 하는 기지국.
- 제9항에 있어서,상기 ACK/NACK 정보의 포맷은 상기 ACK/NACK 정보에 해당되는 상기 데이터의 수를 기반으로 결정되는 것을 특징으로 하는 기지국.
- 이동 통신 시스템의 단말에 있어서,신호를 송수신하는 송수신부; 및기지국으로부터 하이브리드 ARQ(HARQ) 타이밍에 관련된 제1 정보를 상위 계층 시그널링으로 수신하고, 상기 기지국으로부터 스케줄링 정보 및 상기 HARQ 타이밍에 관련된 제2 정보를 수신하고, 상기 기지국으로부터 상기 스케줄링 정보에 의해 스케줄링되는 데이터를 수신하고, 상기 제1 정보 및 상기 제2 정보를 기반으로 결정된 상기 HARQ 타이밍에 따라 상기 데이터에 대한 긍정 수신 확인 또는 부정 수신 확인(ACK/NACK) 정보를 상기 기지국으로 전송하도록 제어하는 제어부를 포함하는 것을 특징으로 하는 단말.
- 제13항에 있어서,상기 제1 정보는 상기 HARQ 타이밍에 관련된 복수의 가능한 값을 지시하며 상기 제2 정보는 상기 복수의 가능한 값 중 하나의 값을 지시하는 정보인 것을 특징으로 하는 단말.
- 제14항에 있어서,상기 HARQ 타이밍에 관련된 가능한 값은 상기 데이터가 수신되는 전송 시간 구간과 상기 ACK/NACK 정보가 전송되는 전송 시간 구간의 차이를 직접 지시하는 값 또는 상기 차이에 적용되는 오프셋(offset) 값인 것을 특징으로 하는 단말.
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JP2018567654A JP7193348B2 (ja) | 2016-07-29 | 2017-07-28 | ダウンリンクデータ送受信方法及びダウンリンクデータ送信基地局並びにダウンリンクデータ受信端末 |
AU2017304556A AU2017304556B2 (en) | 2016-07-29 | 2017-07-28 | Method and apparatus for reporting channel state information in mobile communication system |
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US11303419B2 (en) * | 2018-04-06 | 2022-04-12 | Qualcomm Incorporated | Semi-static HARQ-ACK codebook with multiple PDSCH transmissions per slot |
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CN110474706A (zh) * | 2018-05-11 | 2019-11-19 | 电信科学技术研究院有限公司 | 一种mcs表格确定方法、终端和基站及可读存储介质 |
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CN113169849A (zh) * | 2018-12-12 | 2021-07-23 | 高通股份有限公司 | 使用新参数集和参考信号模式的多媒体广播多播服务 |
CN113169849B (zh) * | 2018-12-12 | 2024-06-04 | 高通股份有限公司 | 用于使用新参数集和参考信号模式的多媒体广播多播服务的方法和设备 |
WO2020172844A1 (zh) * | 2019-02-28 | 2020-09-03 | 华为技术有限公司 | 通信方法和装置 |
CN113615110A (zh) * | 2019-03-26 | 2021-11-05 | 松下电器(美国)知识产权公司 | 基站、终端及通信方法 |
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CN112787752B (zh) * | 2019-11-08 | 2024-05-28 | 迈凌有限公司 | Harq协议的反馈和重传格式 |
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