WO2019216642A1

WO2019216642A1 - Method for transmitting or receiving channel state information in wireless communication system and device therefor

Info

Publication number: WO2019216642A1
Application number: PCT/KR2019/005498
Authority: WO
Inventors: 김형태; 강지원; 박해욱; 염건일
Original assignee: 엘지전자 주식회사
Priority date: 2018-05-09
Filing date: 2019-05-08
Publication date: 2019-11-14

Abstract

Disclosed are a method for transmitting or receiving channel state information in a wireless communication system and a device therefor. Specifically, a method for reporting channel state information (CSI) by a terminal in a wireless communication system may comprise the steps of: receiving a channel state information-reference signal (CSI-RS) for reporting the CSI; and transmitting, to a base station, CSI calculated on the basis of the CSI-RS, wherein the terminal supports one or more CSI processing units, and when the number of CSI reports having been configured for the terminal is greater than the number of CSI processing units unoccupied by the terminal, calculation of the CSI is performed according to a preconfigured priority.

Description

Method for transmitting and receiving channel state information in wireless communication system and apparatus therefor

The present invention relates to a wireless communication system, and more particularly, to a method for transmitting and receiving channel state information and a device for supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service, and the explosive increase in traffic causes shortage of resources and users require faster services. Therefore, a more advanced mobile communication system is required. .

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

The present specification proposes a method for transmitting and receiving channel state information (CSI).

Specifically, when the terminal calculates CSI, one or more CSI processing units (ie, implemented in the terminal) that the terminal supports one or more CSI reports set and / or indicated by the base station Suggest ways to assign and / or assign to.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In a method for a terminal to perform channel state information (channel state information) reporting in a wireless communication system according to an embodiment of the present invention, the method receives a CSI-RS (Channel State Information-Reference Signal) for the CSI report Doing; And transmitting the CSI calculated based on the CSI-RS to a base station; The terminal supports one or more CSI processing units, and when the number of CSI reports set to the terminal is greater than the number of CSI processing units not occupied by the terminal, the calculation of the CSI May be performed according to a preset priority.

In addition, in the method according to an embodiment of the present invention, the preset priority may be set based on a processing time for the CSI.

In the method according to an embodiment of the present invention, the processing time is i) a first processing time which is a time from a triggering time of the CSI report to a time of performing the CSI report, or ii) the CSI. It may be a second processing time that is a time from when the RS is received to when the CSI report is performed.

Further, in the method according to an embodiment of the present invention, when the number of CSI processing units not occupied by the terminal is M, the sum of the first processing time or the first processing time among one or more CSI reports set to the terminal. M CSI reports that minimize the sum of two processing times may be allocated to the M CSI processing units.

Further, in the method according to an embodiment of the present invention, the CSI processing unit not occupied by the terminal satisfies the first processing time or the second processing time among one or more CSI reports set for the terminal. May be allocated for the CSI.

In addition, in the method according to an embodiment of the present invention, the preset priority may be set based on a latency requirement for the CSI.

Further, in the method according to an embodiment of the present invention, the preset priority is set based on the operation type on the time domain of the CSI-RS, and the operation type on the time domain is periodic, semi- It may be either semi-persistent or aperiodic.

In addition, in the method according to an embodiment of the present disclosure, the preset priority may be set based on whether a measurement restriction on calculation of the CSI is set.

In the method according to an embodiment of the present invention, when the CSI-RS is an aperiodic CSI-RS, the preset priority is set at the time of the last symbol of the CSI-RS. Can be set based on this.

In a terminal for performing channel state information reporting in a wireless communication system according to an embodiment of the present invention, the terminal is functionally connected to a radio frequency (RF) unit for transmitting and receiving a radio signal and the RF unit. A processor configured to receive a Channel State Information-Reference Signal (CSI-RS) for the CSI report; Control to transmit the CSI calculated based on the CSI-RS to a base station; The terminal supports one or more CSI processing units, and when the number of CSI reports set to the terminal is greater than the number of CSI processing units not occupied by the terminal, the calculation of the CSI May be performed according to a preset priority.

In addition, in the terminal according to an embodiment of the present invention, the preset priority may be set based on a processing time for the CSI.

Further, in the terminal according to an embodiment of the present invention, the processing time is i) a first processing time which is a time from a triggering time of the CSI report to a time of performing the CSI report or ii) the CSI- It may be a second processing time, which is a time from a reception point of RS to a time point of performing the CSI report.

In addition, in the terminal according to an embodiment of the present invention, when the number of CSI processing units not occupied by the terminal is M, the sum of the first processing time or the first processing time among one or more CSI reports set to the terminal. M CSI reports that minimize the sum of two processing times may be allocated to the M CSI processing units.

In the terminal according to an embodiment of the present invention, the CSI processing unit not occupied by the terminal satisfies the first processing time or the second processing time among one or more CSI reports set for the terminal. May be allocated for CSI.

In the base station for receiving channel state information (channel state information) in a wireless communication system according to an embodiment of the present invention, the base station is functionally connected to the RF (Radio Frequency) unit for transmitting and receiving a radio signal and the RF unit A processor, wherein the processor is configured to transmit a Channel State Information-Reference Signal (CSI-RS) for the CSI reporting; Controlling to receive from the terminal a CSI calculated based on the CSI-RS; The terminal supports one or more CSI processing units, and when the number of CSI reports set to the terminal is greater than the number of CSI processing units not occupied by the terminal, the calculation of the CSI May be performed according to a preset priority.

According to an embodiment of the present invention, in channel state information (CSI) reporting, even if the number of CSI processing units supported by the terminal is smaller than the number of CSI reports set and / or indicated by the base station, There is an effect that CSI calculation and CSI reporting can be performed.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical features of the present invention.

Figure 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.

3 shows an example of a frame structure in an NR system.

FIG. 4 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

FIG. 5 shows examples of an antenna port and a number of resource grids based on each numerology to which the method proposed in this specification can be applied.

6 shows an example of a self-contained structure to which the method proposed in this specification can be applied.

7 shows an example of an operation flowchart of a terminal performing channel state information reporting to which the method proposed in the present specification can be applied.

FIG. 8 shows an example of an operation flowchart of a base station receiving channel state information report to which the method proposed in this specification can be applied.

9 illustrates a wireless communication device according to an embodiment of the present invention.

10 is another example of a block diagram of a wireless communication device to which the methods proposed herein may be applied.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station. The base station may be represented by the first communication device and the terminal by the second communication device. A base station (BS) is a fixed station (Node), Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G) Network), AI system, road side unit (RSU), robot, or the like. In addition, a terminal may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an advanced mobile AMS. Station, Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, Vehicle, Robot, AI Module May be replaced with such terms.

The following techniques can be used for various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced) / LTE-A pro is an evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolution of 3GPP LTE / LTE-A / LTE-A pro.

For clarity, the description will be based on 3GPP communication systems (eg, LTE-A, NR), but the technical spirit of the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. In detail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR means technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" means standard document detail number. LTE / NR may be collectively referred to as 3GPP system. Background, terminology, abbreviations and the like used in the description of the present invention may refer to the matters described in the standard documents published prior to the present invention. For example, see the following document:

3GPP LTE

36.211: Physical channels and modulation

36.212: Multiplexing and channel coding

36.213: Physical layer procedures

36.300: Overall description

36.331: Radio Resource Control (RRC)

3GPP NR

38.211: Physical channels and modulation

38.212: Multiplexing and channel coding

38.213: Physical layer procedures for control

38.214: Physical layer procedures for data

38.300: NR and NG-RAN Overall Description

36.331: Radio Resource Control (RRC) protocol specification

As more communication devices demand larger communication capacities, there is a need for improved mobile broadband communication compared to conventional radio access technology. In addition, massive MTC (Machine Type Communications), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency is being discussed. As described above, the introduction of next generation radio access technology considering enhanced mobile broadband communication (eMBB), massive MTC (Mmtc), ultra-reliable and low latency communication (URLLC), and the like, are referred to herein as NR for convenience. . NR is an expression showing an example of 5G radio access technology (RAT).

The new RAT system including the NR uses an OFDM transmission scheme or a similar transmission scheme. The new RAT system may follow different OFDM parameters than the OFDM parameters of LTE. Alternatively, the new RAT system can follow the existing numeric / numerology of LTE / LTE-A but have a larger system bandwidth (eg, 100 MHz). Alternatively, one cell may support a plurality of neurology. That is, terminals operating with different neurology may coexist in one cell.

Numerology (numerology) corresponds to one subcarrier spacing in the frequency domain. By scaling the reference subcarrier spacing to an integer N, different numerology can be defined.

The three main requirements areas of 5G are: (1) Enhanced Mobile Broadband (eMBB) area, (2) massive Machine Type Communication (mMTC) area, and (3) ultra-reliability and It includes the area of Ultra-reliable and Low Latency Communications (URLLC).

Some use cases may require multiple areas for optimization, and other use cases may be focused on only one key performance indicator (KPI). 5G supports these various use cases in a flexible and reliable way.

eMBB goes far beyond basic mobile Internet access and covers media and entertainment applications in rich interactive work, cloud or augmented reality. Data is one of the key drivers of 5G and may not see dedicated voice services for the first time in the 5G era. In 5G, voice is expected to be treated as an application simply using the data connection provided by the communication system. The main reasons for the increased traffic volume are the increase in content size and the increase in the number of applications requiring high data rates. Streaming services (audio and video), interactive video, and mobile Internet connections will become more popular as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user. Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment. And, cloud storage is a special use case that drives the growth of uplink data rates. 5G is also used for remote tasks in the cloud and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used. Entertainment For example, cloud gaming and video streaming are another key factor in increasing the need for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere, including in high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires very low latency and instantaneous amount of data.

In addition, one of the most anticipated 5G use cases relates to the ability to seamlessly connect embedded sensors in all applications, namely mMTC. By 2020, potential IoT devices are expected to reach 20 billion. Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC includes new services that will change the industry through ultra-reliable / low-latency links available, such as remote control of key infrastructure and self-driving vehicles. The level of reliability and latency is essential for smart grid control, industrial automation, robotics, drone control and coordination.

Next, a number of use cases will be described in more detail.

5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams that are rated at hundreds of megabits per second to gigabits per second. This high speed is required to deliver TVs in 4K and above (6K, 8K and above) resolutions as well as virtual and augmented reality. Virtual Reality (AVR) and Augmented Reality (AR) applications include nearly immersive sporting events. Certain applications may require special network settings. For example, for VR games, game companies may need to integrate core servers with network operator's edge network servers to minimize latency.

Automotive is expected to be an important new driver for 5G, with many examples for mobile communications to vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband. This is because future users continue to expect high quality connections regardless of their location and speed. Another use case in the automotive field is augmented reality dashboards. It identifies objects in the dark above what the driver sees through the front window and overlays information that tells the driver about the distance and movement of the object. In the future, wireless modules enable communication between vehicles, the exchange of information between the vehicle and the supporting infrastructure, and the exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians). Safety systems guide alternative courses of action to help drivers drive safer, reducing the risk of an accident. The next step will be a remotely controlled or self-driven vehicle. This is very reliable and requires very fast communication between different self-driving vehicles and between automobiles and infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will focus on traffic anomalies that the vehicle itself cannot identify. The technical requirements of self-driving vehicles require ultra-low latency and ultra-fast reliability to increase traffic safety to an unachievable level.

Smart cities and smart homes, referred to as smart societies, will be embedded in high-density wireless sensor networks. The distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of the city or home. Similar settings can be made for each hypothesis. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors are typically low data rates, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.

The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of distributed sensor networks. Smart grids interconnect these sensors using digital information and communication technologies to gather information and act accordingly. This information can include the behavior of suppliers and consumers, allowing smart grids to improve the distribution of fuels such as electricity in efficiency, reliability, economics, sustainability of production, and in an automated manner. Smart Grid can be viewed as another sensor network with low latency.

The health sector has many applications that can benefit from mobile communications. The communication system may support telemedicine that provides clinical care from a distance. This can help reduce barriers to distance and improve access to healthcare services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies. A mobile communication based wireless sensor network can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing the cables with reconfigurable wireless links is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with similar cable delay, reliability, and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected in 5G.

Logistics and freight tracking are important use cases for mobile communications that enable the tracking of inventory and packages from anywhere using a location-based information system. The use of logistics and freight tracking typically requires low data rates but requires wide range and reliable location information.

용어 정의Term Definition

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports connectivity to EPC and NGC.

gNB: Node that supports NR as well as connection with NGC.

New RAN: A radio access network that supports NR or E-UTRA or interacts with NGC.

Network slice: A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.

Network function: A network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.

NG-C: Control plane interface used for the NG2 reference point between the new RAN and NGC.

NG-U: User plane interface used for the NG3 reference point between the new RAN and NGC.

Non-standalone NR: A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.

Non-Standalone E-UTRA: Deployment configuration in which the eLTE eNB requires gNB as an anchor for control plane connection to NGC.

User plane gateway: The endpoint of the NG-U interface.

시스템 일반System general

Referring to Figure 1, the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equipment). do.

The gNBs are interconnected via an X _n interface.

The gNB is also connected to the NGC via an NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.

NRNR (New Rat) (New Rat) 뉴머롤로지Numerology (Numerology) 및 프레임(frame) 구조(Numerology) and frame structure

Multiple numerologies can be supported in an NR system. Here, the numerology may be defined by subcarrier spacing and cyclic prefix overhead. At this time, multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing to an integer N (or μ). Further, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the used numerology may be selected independently of the frequency band.

In addition, in the NR system, various frame structures according to a number of numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) neurology and frame structure that can be considered in an NR system will be described.

Multiple OFDM numerologies supported in the NR system may be defined as shown in Table 1.

With regard to the frame structure in the NR system, the size of the various fields in the time domain

Is expressed as a multiple of the time unit. From here,

ego,

to be. Downlink and uplink transmissions

It consists of a radio frame having a section of (radio frame). Here, each radio frame is

It consists of 10 subframes having a section of. In this case, there may be a set of frames for uplink and a set of frames for downlink.

As shown in FIG. 2, the transmission of an uplink frame number i from a user equipment (UE) is greater than the start of the corresponding downlink frame at the corresponding UE.

You must start before.

Numerology

For slots, slots within a subframe

Numbered in increasing order of within a radio frame

They are numbered in increasing order of. One slot

Consists of consecutive OFDM symbols of,

Is determined according to the numerology and slot configuration used. Slot in subframe

Start of OFDM symbol in the same subframe

Is aligned with the beginning of time.

Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot can be used.

Table 2 shows the number of OFDM symbols per slot in a normal CP.

), The number of slots per radio frame (

), The number of slots per subframe (

Table 3 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

3 shows an example of a frame structure in an NR system. 3 is merely for convenience of description and does not limit the scope of the invention. In the case of Table 3, when μ = 2, that is, when the subcarrier spacing (SCS) is 60 kHz, referring to Table 2, one subframe (or frame) may include four slots. As shown in FIG. 3, one subframe = {1,2,4} slots is an example, and the number of slot (s) that may be included in one subframe may be defined as shown in Table 2.

In addition, the mini-slot may consist of two, four or seven symbols, and may consist of more or fewer symbols.

In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.

Hereinafter, the physical resources that may be considered in the NR system will be described in detail.

First, with respect to the antenna port, the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of the channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship. Here, the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

Referring to Figure 4, the resource grid on the frequency domain

By way of example, one subframe includes 14 x 2 ^ u OFDM symbols, but is not limited thereto.

In an NR system, the transmitted signal is

One or more resource grids composed of subcarriers, and

Is described by the OFDM symbols of. From here,

to be. remind

Denotes the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.

In this case, as shown in Figure 5, the numerology

And one resource grid for each antenna port p.

Numerology

And each element of the resource grid for antenna port p is referred to as a resource element and is an index pair

Uniquely identified by From here,

Is the index on the frequency domain,

Refers to the position of a symbol within a subframe. Index pair when referring to a resource element in a slot

This is used. From here,

to be.

Numerology

Resource elements for antenna and antenna port p

Is a complex value

Corresponds to If there is no risk of confusion, or if no specific antenna port or numerology is specified, the indices p and

Can be dropped, so the complex value is

or

This can be

In addition, a physical resource block may be located in the frequency domain.

It is defined as consecutive subcarriers.

Point A serves as a common reference point of the resource block grid and can be obtained as follows.

OffsetToPointA for the PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block and point A overlapping with the SS / PBCH block used by the UE for initial cell selection, and a 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;

absoluteFrequencyPointA indicates the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN).

Common resource blocks set subcarrier spacing

It is numbered from zero up in the frequency domain for.

Set subcarrier spacing

The center of the subcarrier 0 of the common resource block 0 with respect to 'point A'. Common resource block number in the frequency domain

And subcarrier spacing

The resource element (k, l) for may be given by Equation 1 below.

From here,

Is

It can be defined relative to point A to correspond to the subcarrier centered on this point A. Physical resource blocks are zero-based within the bandwidth part (BWP).

Numbered until,

Is the number of the BWP. Physical resource blocks on BWP i

And common resource blocks

Can be given by Equation 2 below.

From here,

May be a common resource block in which the BWP starts relative to common resource block 0.

대역폭 파트 (Bandwidth part, BWP)Bandwidth part (BWP)

NR systems can be supported up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC operates with the RF for the entire CC always on, the terminal battery consumption may increase. Alternatively, when considering multiple use cases (e.g., eMBB, URLLC, Mmtc, V2X, etc.) operating in one wideband CC, different numerology (e.g., sub-carrier spacing) may be supported for each frequency band within the CC. Or, the capability of the maximum bandwidth may vary for each terminal. In consideration of this, the base station may instruct the terminal to operate only in some bandwidths rather than the entire bandwidth of the wideband CC, and define the corresponding bandwidths as bandwidth parts (BWPs) for convenience. The BWP may consist of consecutive resource blocks (RBs) on the frequency axis and may correspond to one numerology (e.g., sub-carrier spacing, CP length, slot / mini-slot duration).

On the other hand, the base station can set a number of BWP even in one CC configured in the terminal. For example, in the PDCCH monitoring slot, a BWP that occupies a relatively small frequency region may be set, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. Or, if UEs are concentrated in a specific BWP, some UEs can be configured as other BWPs for load balancing. Alternatively, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, some BWPs may be set within the same slot by excluding some spectrum from the entire bandwidth. That is, the base station can configure at least one DL / UL BWP to the UE associated with the wideband CC, at least one DL / UL BWP of the configured DL / UL BWP (s) at a specific time (L1 signaling or MAC Can be activated by CE or RRC signaling) and switching to another configured DL / UL BWP can be indicated (by L1 signaling or MAC CE or RRC signaling) or when timer value expires based on timer can be switched. At this time, the activated DL / UL BWP is defined as the active DL / UL BWP. However, the UE may not receive the configuration for DL / UL BWP during the initial access process or before the RRC connection is set up. In this situation, the UE assumes that the DL / UL BWP is the initial active DL. / UL BWP

Self-contained 구조Self-contained structure

The time division duplex (TDD) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one slot (or subframe). This is to minimize latency of data transmission in a TDD system, and the structure may be referred to as a self-contained structure or a self-contained slot.

6 shows an example of a self-contained structure to which the method proposed in this specification can be applied. 6 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 6, as in the case of legacy LTE, it is assumed that one transmission unit (eg, slot, subframe) includes 14 orthogonal frequency division multiplexing (OFDM) symbols.

In FIG. 6, an area 602 means a downlink control region, and an area 604 means an uplink control region. Also, an area other than the area 602 and the area 604 (that is, an area without a separate indication) may be used for transmitting downlink data or uplink data.

That is, uplink control information and downlink control information may be transmitted in one self-contained slot. On the other hand, in the case of data, uplink data or downlink data may be transmitted in one self-contained slot.

In the structure shown in FIG. 6, downlink transmission and uplink transmission are sequentially performed in one self-contained slot, and transmission of downlink data and reception of uplink ACK / NACK may be performed.

As a result, when an error in data transmission occurs, the time required for retransmission of data can be reduced. In this way, delays associated with data delivery can be minimized.

In the self-contained slot structure as shown in FIG. 6, a process of switching from a transmission mode to a reception mode by a base station (eNodeB, eNB, gNB) and / or a terminal (User Equipment) Alternatively, a time gap for switching from a reception mode to a transmission mode is required. In relation to the time gap, when uplink transmission is performed after downlink transmission in the self-contained slot, some OFDM symbol (s) may be set to a guard period (GP).

Regarding CSI measurement and / or reporting, the following issues are discussed.

The time offset of the CSI reference resource may be derived from Z ′ and numerology (eg, subcarrier spacing) for CSI latency.

Specifically, in relation to calculation or computation of CSI, Z and Z 'values may be defined as shown in Tables 4 to 7 below. Here, Z is related only to the aperiodic CSI report and may mean a minimum time (or time gap) from the time when the UE receives the DCI scheduling the CSI report to the time of performing the actual CSI report. . In addition, z 'is the minimum time (or time gap) from the time when the UE receives the measurement resources (ie, CMR, IMR) (eg, CSI-RS, etc.) related to the CSI reporting to the time to perform the actual CSI reporting. Can mean. In general, with respect to (z, z ') and neurology, the CSI delay may be expressed as shown in Table 4 below.

In addition, Tables 5 and 6 show examples of CSI calculation time for a normal UE and CSI calculation time for an advanced UE, respectively. Table 5 and Table 6 are only examples, and do not limit the method and the like proposed herein.

In addition, with respect to the CSI delay described above, it may be assumed that when N CSI reports are triggered, up to X CSI reports will be calculated at a given time. Here, X may be based on terminal capability information. In addition, with respect to the aforementioned Z (and / or Z '), the UE may be configured to ignore the DCI scheduling the CSI report that does not satisfy the condition related to the Z value.

In addition, the information related to the CSI delay as described above (ie, information about (Z, Z ')) may be reported by the terminal (to the base station) as UE capability information.

For example, when an aperiodic CSI report is triggered only through a PUSCH configured as a single CSI report, the UE may perform scheduling downlink control information (DCI) having a symbol offset such as 'MLN <Z'. It may not be expected to receive. In addition, when aperiodic CSI-RS (Channel State Information-Reference Signal) is used for channel measurement and has a symbol offset such as 'MON <Z', the UE may not be expected to receive the scheduling DCI. have.

In the above description, L represents a last symbol of the PDCCH triggering aperiodic reporting, M represents a starting symbol of the PUSCH, and N represents a Timing Advanced (TA) value in symbol units. have. O is also the last symbol of the aperiodic CSI-RS for Channel Measurement Resource (CMR), the last symbol of the aperiodic non zero power (NZP) CSI-RS for Interference Measurement Resource (IMR), if present, and It represents the last symbol of the last symbol (if present) of aperiodic Channel State Information Interference Measurement (CSI-IM). The CMR may refer to RS and / or resources for channel measurement, and the IMR may refer to RS and / or resources for interference measurement.

In relation to the CSI report described above, a case in which the CSI report is collided may occur. Here, the collision of the CSI report may refer to a case where time occupancy of a physical channel scheduled to transmit CSI reports is overlapped in at least one symbol and transmitted in the same carrier. For example, when two or more CSI reports collide, one CSI report may be performed according to the following rule. In this case, the priority of CSI reporting may be determined in a sequential manner in which Rule # 1 is first applied and then Ruel # 2 is applied. Rule # 2, Rule # 3, and Rule # 4 among the following rules may be applied only to all periodic reporting and semi-persistent reporting for PUCCH.

Rule # 1: From an operation point of view in the time domain, Aperiodic (AP) CSI> PUSCH-based semi-persistent (SP) CSI> PUCCH-based semi-persistent CSI> Periodic (Periodic, P) CSI

Rule # 2: From the perspective of CSI content, CSI for beam management (e.g. beam reporting)> CSI for CSI acquisition

Rule # 3: From the cell ID (cell ID, cellID) perspective, PCell (Primary Cell)> PSCell (Primary Secondary Cell)> other cell IDs (in increasing order)

Rule # 4: In terms of CSI reporting-related identifiers (eg csiReportID), in order of increasing index of identifiers

In addition, in relation to the above-described CSI report, a CSI processing unit (CSI) may be defined. For example, the terminal supporting X CSI calculations (eg, based on terminal capability information 2-35) may mean that the terminal has X CSI processing units. In this case, the number of CSI processing units may be represented by K_s.

For example, for aperiodic CSI reporting using aperiodic CSI-RS (comprised of a single CSI-RS resource in the resource set for channel measurement), the CSI processing unit carries the CSI report in the first OFDM symbol after PDCCH triggering. It may be kept occupied until the last symbol of the PUSCH.

In another example, when N CSI reports are triggered in a slot (each configured as a single CSI-RS resource in a resource set for channel measurement), but the UE has only M un-occupied CSI processing units. The UE may be configured to update (ie, report) only M of N CSI reports.

In addition, with respect to the aforementioned X CSI calculations, the terminal capability may be set to support either the Type A CSI processing capability or the Type B CSI processing capability.

For example, an A-CSI trigger state triggers N CSI reports (where each CSI report is associated with (Z_n, Z'_n)) and M non-occupied CSIs. Suppose you have a processing unit.

For Type A CSI processing capability, the time gap between the first symbol of the PUSCH and the last symbol related to the aperiodic CSI-RS / aperiodic CSI-IM is

If the CSI calculation time according to is not sufficient, the UE may not be expected to update any of the triggered CSI reports. In addition, the terminal

DCI scheduling PUSCH with smaller scheduling offset can be ignored.

In case of Type B CSI processing capability, the UE may not be expected to update the CSI report if the PUSCH scheduling offset does not have enough CSI calculation time according to the end Z 'value in the corresponding report. In addition, the UE may ignore the DCI scheduling the PUSCH having a scheduling offset smaller than any one of the Z values for other reports.

For another example, CSI reporting based on periodic and / or semi-persistent CSI-RS may be assigned to a CSI processing unit according to the Type A scheme or Type B scheme below. The Type A scheme may assume a serial CSI processing implementation, and the Type B scheme may assume a parallel CSI processing implementation.

In the Type A scheme, for periodic and / or semi-persistent CSI reporting, the CSI processing unit carries the CSI report from the first symbol of the CSI reference resource of the periodic and / or semi-persistent CSI reporting. Up to the first symbol of the physical channel may be occupied. In the case of aperiodic CSI reporting, it may be occupied from the first symbol after the PDCCH triggering the CSI report to the first symbol of the physical channel carrying the CSI report.

In the Type B scheme, periodic or aperiodic CSI reporting settings based on periodic and / or semi-persistent CSI-RSs may be assigned to one or K_s CSI processing units, and always one or K_s CSIs. The processing unit may be occupied. In addition, activated semi-persistent CSI reporting settings may be assigned to one or K_s CSI processing units, and may occupy one or K_s CSI processing units before being deactivated. If semi-persistent CSI reporting is deactivated, the CSI processing unit may be used for other CSI reporting.

In addition, in the case of the Type A CSI processing capability described above, if the number of CSI processing units occupied by the periodic and / or semi-persistent CSI reporting exceeds the number X of simultaneous CSI calculations according to the UE capability, the terminal may perform periodic and And / or may not be expected to update semi-persistent CSI reporting.

With regard to the above-described CSI Processing Unit (CPU), rules need to be considered to determine which CSI will use the CSI processing unit, that is, which CSI will be assigned to the CSI processing unit. In the context of the CSI processing unit herein, CSI may mean or refer to CSI reporting.

In the present specification, for convenience of description, it is assumed that a terminal has X CSI processing units, of which XM CSI processing units are occupied (ie, used) by CSI calculation and M CSI processing units are not occupied. . That is, M may mean the number of CSI processing units not occupied by the CSI report.

At this time, a situation may arise where N CSI reports larger than M compete to start occupying the CSI processing unit at a specific time point (eg, a specific OFDM symbol).

For example, if the occupancy (ie use) of a CSI processing unit for three CSI reports starts with M being 2 in the nth OFDM symbol, only two of the three CSI reports will occupy the CSI processing unit. do. In this case, the CSI processing unit is not allocated (or assigned) for the other CSI report, and the CSI for the CSI report cannot be calculated. For CSI that has not been calculated, define (or promise) to report back the most recently calculated and / or reported CSI for that CSI report, define (or promise) to report a specific preset CSI value, or report It may be considered to define (or promise) not to.

Hereinafter, in the present specification, when there is competition for the occupancy of the CSI processing unit, as to the priority (hereinafter, the priority for occupying the CSI processing unit) of which CSI report is assigned to the CSI processing unit first, Suggest methods In addition to the methods described below, the priority for the occupancy of the CSI processing unit may be set the same or similar to that in the aforementioned CSI collision.

Method 1)

The priority for occupancy of the CSI processing unit may be determined based on the latency requirement.

In the NR system, all CSIs may be determined as either low latency CSI or high latency CSI. Here, the low delay CSI may mean a CSI having a low complexity of the UE in calculating the CSI, and the high delay CSI may mean a CSI having a high complexity of the UE in calculating the CSI. For example, if the CSI is a low delay CSI, the CSI yields less CSI output and occupies the CSI processing unit for a shorter time than the high delay CSI.

The low delay CSI may be set to occupy the CSI processing unit in preference to the high delay CSI. This is advantageous in that, when the low delay CSI collides with the low delay CSI, the low delay CSI is prioritized to minimize the occupancy time of the CSI processing unit, and the CSI processing unit can be quickly used for calculating another CSI.

Alternatively, the high delay CSI may be set to occupy the CSI processing unit in preference to the low delay CSI. This is because high delay CSI is more computationally complex and may provide more and / or accurate channel information than low delay CSI.

Method 2)

The priority for the occupancy of the CSI processing unit may be determined based on the occupancy end time of the CSI processing unit.

CSI having a short occupancy end time of the CSI processing unit may be set to preferentially occupy the CSI processing unit.

Although the occupancy start time for a CSI processing unit is the same for multiple CSI (reports), the occupancy end time may be different. In one example, even for the same low delay CSI or high delay CSI, the channel and / or interference measurement CSI-RS and / or CSI-Imdml time domain behavior (e.g., periodic, semi- On-going and non-periodic), the seizure end time for each CSI report may vary. As the occupancy end point takes precedence over the short CSI, the occupancy time of the CSI processing unit is minimized, and the CSI processing unit can be quickly used for calculating another CSI.

Alternatively, CSI having a long occupancy end time (ie, late) of the CSI processing unit may be set to preferentially occupy the CSI processing unit. This is because a CSI with a long occupancy end time takes a long calculation time and can provide more and / or accurate channel information.

Method 3)

The priority for the occupancy of the CSI processing unit is based on the operation in the time domain for the reference signal (eg CSI-RS) used for channel measurement and / or the reference signal (eg CSI-IM) used for interference measurement. Can be determined.

For convenience of description, in this method, it is assumed that a reference signal used for channel measurement in connection with CSI reporting is CSI-RS and a reference signal used for interference measurement is CSI-IM.

CSI-RS and / or CSI-IM may be transmitted and received in three types: periodic, semi-persistent, or aperiodic. CSI, which is calculated based on the periodic CSI-RS and / or CSI-IM, may have many opportunities to measure channel and / or interference. Thus, it may be desirable for CSI calculated based on aperiodic CSI-RS and / or CSI-IM to occupy the CSI processing unit preferentially over CSI based on periodic CSI-RS and / or CSI-IM.

Thus, CSI based on aperiodic CSI-RS and / or CSI-IM, CSI based on semi-persistent CSI-RS and / or CSI-IM, CSI based on periodic CSI-RS and / or CSI-IM, and so on. Can be determined. That is, CSI as 'CSI based on aperiodic CSI-RS and / or CSI-IM> CSI based on semi-persistent CSI-RS and / or CSI-IM> CSI based on periodic CSI-RS and / or CSI-IM' The priority for the occupation of the processing unit may be determined. Such priority may be extended not only to the priority for the occupancy of the CSI processing unit but also to the above-described CSI collision rule.

Or priority in order of CSI based on periodic CSI-RS and / or CSI-IM, CSI based on semi-persistent CSI-RS and / or CSI-IM, CSI based on aperiodic CSI-RS and / or CSI-IM May be determined.

Method 4)

The priority for the occupancy of the CSI processing unit may be determined based on time domain measurement behavior.

For example, a priority regarding the occupancy of the CSI processing unit may be determined according to a restriction related to the CSI measurement, that is, whether a measurement restriction is set.

When the UE generates the CSI by measuring the CSI-RS and / or CSI-IM received at a specific time as the measurement limit is turned on, the corresponding CSI is turned off than the measured CSI. It may be set to occupy the CSI processing unit first. Such priority may be extended not only to the priority for the occupancy of the CSI processing unit but also to the above-described CSI collision rule.

Alternatively, when the terminal generates the CSI while the measurement restriction is turned off, the corresponding CSI may be set to occupy the CSI processing unit in preference to the measured CSI when the measurement restriction is turned on.

Method 5)

The priority for occupancy of the CSI processing unit may be determined based on the Z value and / or Z 'value described above. Here, Z is related only to the aperiodic CSI report and may mean a minimum time (or time gap) from the time when the UE receives the DCI scheduling the CSI report to the time of performing the actual CSI report. . In addition, z 'is the minimum time (or time gap) from the time when the UE receives the measurement resources (ie, CMR, IMR) (eg, CSI-RS, etc.) related to the CSI reporting to the time to perform the actual CSI reporting. Can mean.

Subcarrier spacing (SCS) and delay related settings may be different for each CSI, and accordingly, Z values and / or Z 'values may be set differently for each CSI.

For example, when selecting M (ie, M CSI reports to be allocated to the CSI processing unit) among N CSI reports scheduled to the UE, the CSI processing unit is given priority by giving priority to CSIs having a small Z value and / or a Z 'value. Can be set to occupy (hereinafter, scheme 5-1)). A CSI report having a small Z value and / or Z 'value occupies a short time in a CSI processing unit, and may then be efficient since the corresponding CSI processing unit may be used to calculate a new CSI.

In general, since the smaller the subcarrier interval, the smaller the Z value and / or the Z 'value, CSI having a smaller subcarrier interval may have a higher priority in terms of occupying the CSI processing unit. In addition, since the lower the Z value and / or the Z 'value, the lower the delay, the lower the CSI may have a higher priority in terms of occupying the CSI processing unit. In addition, it is possible to compare the delays to determine the occupancy order of the CSI processing units, and to set the occupancy of the CSI processing units in the order in which the subcarrier intervals are small when the delays are the same. Conversely, the order of occupancy of the CSI processing units may be determined by comparing the subcarrier intervals, and may be set to occupy the CSI processing units in order of low delay when the subcarrier intervals are the same.

For another example, when selecting M of the N CSI reports scheduled for the UE (that is, M CSI reports to be allocated to the CSI processing unit), the CSI processing having priority on CSI having a large Z value and / or Z 'value is preferred. Can be set to occupy the unit (hereinafter, scheme 5-2)). A CSI report with a large Z value and / or Z 'value occupies a long time for the CSI processing unit, but since the CSI is more accurate and has a lot of channel information, it may be assumed to be more important CSI even if the calculation time is long.

In relation to the above-described method 5), a method may be considered in which the methods 5-1) and 5-2 selectively apply according to a predetermined condition.

First, the UE selects M CSIs by giving priority to CSI having a large Z value. If the ZSI is greater than the processing time given by the scheduler and thus the CSI calculation is not generated, the UE may select M CSIs because the CSI having a smaller Z value preferentially occupies the CSI processing unit. have. Otherwise, the UE may select M CSIs because the CSI having a large Z value preferentially occupies the CSI processing unit. Herein, the processing time is a time from the triggering time of the CSI report to the time of performing the actual CSI report, the time from the CSI reference resource to the actual CSI report, or CSI-RS and / or Alternatively, this may mean a time from the last symbol of the CSI-IM to the actual CSI report.

Alternatively, the UE determines a CSI that satisfies a given processing time among N CSIs, sets the determined CSI as a valid CSI set, and sets M Ms having a large Z value within the set valid CSI set. CSI can be selected with priority. Alternatively, M CSIs having a small Z value may be preferentially selected within a set valid CSI set. Since CSIs not included in the effective CSI set are CSIs that are not calculated or reported, it may be effective for the UE to exclude CSIs that are not calculated or reported among N CSIs from the competition.

Method 6)

The priority for occupancy of the CSI processing unit may be determined based on whether to report a CSI-RS Resource Indicator (CRI).

If the CRI is a CSI reported together (that is, the CSI is included as a CSI reporting quantity), even if the corresponding CSI is one CSI, the CSI processing unit may be occupied by the number of CSI-RSs used for measurement. For example, when the UE performs channel measurement using 8 CSI-RSs and reports a CRI for selecting one of them, eight CSI processing units are occupied. In this case, a problem may arise that a single CSI occupies a large number of CSI processing units. To solve this, in a situation where competition for occupancy of the CSI processing unit occurs, the priority of the CSI with which the CRI is reported together may be set lower than that of the CSI that is not.

Alternatively, the priority of the CSI with which the CRI is reported may be set higher than that of the CSI that is not. This may be more important because the CSI with which the CRI is reported has a greater amount of channel information than the CSI that is not.

In addition, the above-described methods 1) to 6) may be used in combination with the above-described priority rule related to CSI collision to determine the priority for the occupancy of the CSI processing unit.

For example, with regard to the occupancy of the CSI processing unit, the method 1) may be applied in preference to the rules # 1 to # 4 described above. This means that the CSI processing unit's occupancy rules are given priority over low CSI (reporting), and if the delays are the same, the priority of the occupancy of the CSI processing units is determined according to the priority rules related to the CSI collision described above. can do. Alternatively, Method 1 may be applied after applying Rule # 1, and then Rules # 2 to # 4 may be applied sequentially. Alternatively, Method 1 may be applied after applying Rules # 1 and # 2, and then Rules # 3 and # 4 may be applied sequentially.

The above-described methods 1) to 6) maintain CSIs (or CSI reports) that have previously occupied the CSI processing unit at a certain point in time (e.g., the nth OFDM symbol) (hereinafter, referred to as the prior CSI). The competition and priority between the CSIs (hereinafter, post CSIs) that intend to start occupying the CSI processing unit at the specific time point has been described. Extending this, the above-described methods 1) to 5) may also be applied to the competition and priority between CSIs that have previously occupied the CSI processing unit at a certain point in time and new CSIs which intend to occupy the CSI processing unit.

Of course, if no more than M CSIs attempt to start occupying the CSI processing unit at any point in time, all CSIs may occupy the CSI processing unit without competition. However, when more than M CSIs start to occupy the CSI processing unit, N-CSIs that attempt to occupy may compete with the X-M CSIs already occupying the CSI processing unit. At this time, the competition may be performed according to one of the following two methods.

The first is a method in which N-CSIs that want to start occupying X-M CSIs compete equally again. The previous CSI is already a vested interest CSI that has occupied the CSI processing unit, but is set up to compete again with N subsequent CSIs without the advantage of this.

The second method is to compete among the subsequent CSIs first, and to give the CSI the opportunity to compete with the previous CSI after losing the competition. That is, the CSI after losing the competition and the previous CSI may be set to compete again according to a specific rule. As a result, if a later CSI takes precedence, the CSI processing unit that was occupied by the previous CSI may be used for later CSI.

If the subsequent CSI has a higher priority than the previous CSI by applying a specific rule, the previous CSI gives the occupancy of the CSI processing unit to the subsequent CSI, and the CSI processing unit is used for the subsequent CSI calculation. In this case, the previous CSI may be in a state where the calculation is not completed. Thus, for reporting on that CSI, define (or promise) to report back recently calculated or reported CSI, define (or promise) to report a specific preset CSI value, or not to report (or promise) May be considered.

For example, suppose that the method 2) described above is applied in a competition between a subsequent CSI and a previous CSI. If there is a CSI in the later CSI whose occupation ends earlier than the previous CSI, the subsequent CSI may take away the CSI processing unit occupied by the previous CSI. Alternatively, if the above method 1) is applied, the CSI after the low delay may take away the CSI processing unit occupied by the CSI before the high delay.

Further, as mentioned above, the CSI calculated through channel measurement based on periodic and / or semi-persistent CSI-RS may be set to always occupy the CSI processing unit. In this case only, a scheme may be considered in which a competition between a previous CSI and a subsequent CSI is allowed, and a CSI processing unit is set to be redistributed according to a priority. In addition, a manner in which a previous CSI calculated through channel measurement based on periodic and / or semi-persistent CSI-RSs does not compete with subsequent CSIs and is set to occupy a CSI processing unit exclusively may be considered. In this case, competition between the remaining CSI and subsequent CSI may be allowed.

Also, as mentioned above, for Type A CSI processing capability, the time gap between the first symbol of the PUSCH and the last symbol associated with the aperiodic CSI-RS / aperiodic CSI-IM is

If the CSI calculation time according to is not sufficient, the UE may not be expected to update any of the triggered CSI reports. At this time, with respect to M CSI processing units not occupied, a method of selecting M CSIs (reports) to be allocated to the CSI processing units among N CSIs (reports) scheduled for the terminal needs to be considered.

In this regard, as a method for selecting the M pieces, the methods 1) to 6) proposed in the present specification and a priority rule related to CSI collision may be used.

In addition, as a method for selecting the M pieces, the M pieces having the smallest Z_TOT and / or Z'_TOT among the N CSIs may be selected. Here, Z_TOT and / or Z'_TOT may mean a value obtained by adding Z values and / or Z 'values for CSI reports to be reported (or updated) by the UE. When the M CSIs (sets) with the smallest Z'_TOT and the M CSIs (sets) with the smallest Z_TOT are different, one of them can be finally selected. Alternatively, one of the N CSIs may be set to select M with the largest Z_TOT and / or Z'_TOT.

In addition, in such a manner as to select the M, to select M of the N CSI so that the last symbol of the aperiodic CSI-RS and / or the aperiodic CSI-IM associated with the CSI report is received at the earliest point in time. Can be set. Alternatively, one of the N CSIs may be configured to select M so that the last symbol of the aperiodic CSI-RS and / or the aperiodic CSI-IM associated with the CSI report is received at the latest time.

For example, N is 3, the last symbol of aperiodic CSI-RS and / or aperiodic CSI-IM for CSI 1 is located in the fifth symbol of the kth slot, and the aperiodic CSI for CSI 2 The last symbol of the RS and / or aperiodic CSI-IM is located in the fifth symbol of the k-1 th slot, and the last symbol of the aperiodic CSI-RS and / or the aperiodic CSI-IM for CSI 3 is the k th slot Suppose it is located at the sixth symbol of. In this case, when M is set to 2, CSI 1 and CSI 2 may be selected to occupy the CSI processing unit. When the CSI 3 is selected, the last symbol of the aperiodic CSI-RS and / or the aperiodic CSI-IM is located in the sixth symbol of the k-th slot so that the reception time of the corresponding CSI-RS and / or CSI-IM is increased. Because it is late.

Based on the above-described methods, the CSI report set and / or indicated by the base station to the terminal may be allocated and / or occupied by the CSI processing unit supported by the terminal.

7 shows an example of an operation flowchart of a terminal performing channel state information reporting to which the method proposed in the present specification can be applied. 7 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 7, it is assumed that the terminal supports one or more CSI processing units for performing CSI reporting and / or calculating CSI.

The terminal may receive a Channel State Information-Reference Signal (CSI-RS) for (one or more) CSI reporting from the base station (S705). For example, the CSI-RS may be a Non-Zero-Power (NZP) CSI-RS and / or a Zero-Power (ZP) CSI-RS. In addition, in the case of interference measurement, the CSI-RS may be replaced with a CSI-IM.

The terminal may transmit the CSI calculated based on the CSI-RS to the base station (S710).

At this time, when the number of CSI reports set to the terminal is larger than the number of CSI processing units not occupied by the terminal, the calculation of the CSI may be performed according to a predetermined priority. Here, the predetermined priority may be set and / or defined as in the methods 1 to 6 described above in the present specification.

For example, the preset priority may be set based on a processing time for the CSI. The processing time is i) a first processing time (eg, Z) described above, which is a time from a triggering time point of the CSI report to a time point of performing the CSI report, or ii) from a reception time point of the CSI-RS. It may be a second processing time that is a time until the execution time of the CSI report (eg, Z ′ described above).

In addition, when the number of CSI processing units not occupied by the terminal is M, M CSIs that minimize the sum of the first processing time or the sum of the second processing time among one or more CSI reports set for the terminal. The report may be assigned to M CSI processing units.

In addition, the CSI processing unit not occupied by the terminal may be allocated to a CSI that satisfies the first processing time or the second processing time among one or more CSI reports set for the terminal.

In another example, the preset priority may be set based on a latency requirement for the CSI.

For another example, the preset priority is set based on the type of operation in the time domain of the CSI-RS, and the type of time domain behavior in the time domain is periodic, semi-persistent. It may be one of -persistent or aperiodic.

As another example, the preset priority may be set based on whether a measurement restriction on the calculation of the CSI is set (eg, ON or OFF).

For another example, when the CSI-RS is an aperiodic CSI-RS, the preset priority may be set based on a time point of a last symbol of the CSI-RS.

In this regard, in an implementation aspect, the above-described operation of the terminal may be specifically implemented by the

terminal devices

920 and 1020 shown in FIGS. 9 and 10 of the present specification. For example, the above-described operation of the terminal may be performed by the

processors

921 and 1021 and / or a radio frequency (RF) unit (or module) 923 and 1025.

In a wireless communication system, a terminal receiving a data channel (eg, a PDSCH) includes a transmitter for transmitting a radio signal, a receiver for receiving a radio signal, and a processor operatively connected to the transmitter and the receiver. can do. Here, the transmitter and the receiver (or transceiver) may be referred to as an RF unit (or module) for transmitting and receiving radio signals.

For example, the processor may control the RF unit to receive a Channel State Information-Reference Signal (CSI-RS) for (one or more) CSI reporting from the base station. In addition, the processor may control the RF unit to transmit the CSI calculated based on the CSI-RS to the base station.

FIG. 8 shows an example of an operation flowchart of a base station receiving channel state information report to which the method proposed in this specification can be applied. 8 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 8, it is assumed that the terminal supports one or more CSI processing units for performing CSI reporting and / or calculating CSI.

The base station may transmit a channel state information-reference signal (CSI-RS) for (one or more) CSI reporting to the terminal (S805). For example, the CSI-RS may be a Non-Zero-Power (NZP) CSI-RS and / or a Zero-Power (ZP) CSI-RS. In addition, in the case of interference measurement, the CSI-RS may be replaced with a CSI-IM.

The base station may receive the CSI calculated based on the CSI-RS from the terminal (S810).

In this regard, in an implementation aspect, the above-described operation of the base station may be specifically implemented by the

base station apparatuses

910 and 1010 shown in FIGS. 9 and 10 of the present specification. For example, the above-described operation of the base station may be performed by the

processors

911 and 1011 and / or a radio frequency (RF) unit (or module) 913 and 1015.

In a wireless communication system, a base station transmitting a data channel (eg, PDSCH) includes a transmitter for transmitting a radio signal, a receiver for receiving a radio signal, and a processor operatively connected to the transmitter and the receiver. can do. Here, the transmitter and the receiver (or transceiver) may be referred to as an RF unit (or module) for transmitting and receiving radio signals.

For example, the processor may control the RF unit to transmit a channel state information reference signal (CSI-RS) for (one or more) CSI reporting to the terminal. In addition, the processor may control the RF unit to receive the CSI calculated based on the CSI-RS from the terminal.

본 발명이 적용될 수 있는 장치 일반General apparatus to which the present invention can be applied

Referring to FIG. 9, a wireless communication system may include a first device 910 and a second device 920.

The first device 910 includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV (Artificial Intelligence) Module, Robot, Augmented Reality Device, Virtual Reality Device, Mixed Reality Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate / environment device, a device related to 5G service, or another device related to the fourth industrial revolution field.

The second device 920 includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV (Artificial Intelligence) Module, Robot, Augmented Reality Device, Virtual Reality Device, Mixed Reality Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate / environment device, a device related to 5G service, or another device related to the fourth industrial revolution field.

For example, the terminal may be a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet. It may include a tablet PC, an ultrabook, a wearable device (eg, a smartwatch, a glass glass, a head mounted display), and the like. . For example, the HMD may be a display device worn on the head. For example, the HMD can be used to implement VR, AR or MR.

For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the VR device may include a device that implements an object or a background of a virtual world. For example, the AR device may include a device that connects and implements an object or a background of the virtual world to an object or a background of the real world. For example, the MR device may include a device that fuses and implements an object or a background of the virtual world to an object or a background of the real world. For example, the hologram device may include a device that records and reproduces stereoscopic information to implement a 360 degree stereoscopic image by utilizing interference of light generated by two laser lights, called holography, to meet each other. For example, the public safety device may include an image relay device or an image device wearable on a human body of a user. For example, the MTC device and the IoT device may be devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include a smart meter, a bending machine, a thermometer, a smart bulb, a door lock or various sensors. For example, a medical device may be a device used for the purpose of diagnosing, treating, alleviating, treating or preventing a disease. For example, a medical device may be a device used for the purpose of diagnosing, treating, alleviating or correcting an injury or disorder. For example, a medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or function. For example, the medical device may be a device used for controlling pregnancy. For example, the medical device may include a medical device, a surgical device, an (extracorporeal) diagnostic device, a hearing aid or a surgical device, and the like. For example, the security device may be a device installed to prevent a risk that may occur and to maintain safety. For example, the security device may be a camera, a CCTV, a recorder or a black box. For example, the fintech device may be a device capable of providing financial services such as mobile payment. For example, the fintech device may include a payment device or a point of sales (POS). For example, the climate / environmental device may include a device that monitors or predicts the climate / environment.

The first device 910 may include at least one or more processors, such as a processor 911, at least one or more memories, such as a memory 912, and at least one or more transceivers, such as a transceiver 913. The processor 911 may perform the functions, procedures, and / or methods described above. The processor 911 may perform one or more protocols. For example, the processor 911 may perform one or more layers of the air interface protocol. The memory 912 may be connected to the processor 911 and store various types of information and / or instructions. The transceiver 913 is connected to the processor 911 and may be controlled to transmit and receive a wireless signal.

The second device 920 may include at least one processor such as a processor 921, at least one memory device such as a memory 922, and at least one transceiver such as a transceiver 923. The processor 921 may perform the functions, procedures, and / or methods described above. The processor 921 may implement one or more protocols. For example, the processor 921 may implement one or more layers of a radio interface protocol. The memory 922 may be connected to the processor 921 and store various types of information and / or instructions. The transceiver 923 may be connected to the processor 921 and controlled to transmit and receive a wireless signal.

The memory 912 and / or the memory 922 may be respectively connected inside or outside the processor 911 and / or the processor 921, and may be connected to other processors through various technologies such as a wired or wireless connection. It may also be connected to.

The first device 910 and / or the second device 920 may have one or more antennas. For example, antenna 914 and / or antenna 924 may be configured to transmit and receive wireless signals.

Referring to FIG. 10, a wireless communication system includes a base station 1010 and a plurality of terminals 1020 located in a base station area. The base station may be represented by a transmitting device, the terminal may be represented by a receiving device, and vice versa. The base station and the terminal are a processor (processor, 1011, 1021), memory (memory, 1014,1024), one or more Tx / Rx RF module (radio frequency module, 1015, 1025), Tx processor (1012, 1022), Rx processor ( 1013 and 1023, and

antennas

1016 and 1026. The processor implements the salping functions, processes and / or methods above. More specifically, in the DL (communication from the base station to the terminal), upper layer packets from the core network are provided to the processor 1011. The processor implements the functionality of the L2 layer. In the DL, the processor provides the terminal 1020 with multiplexing and radio resource allocation between the logical channel and the transport channel, and is responsible for signaling to the terminal. The transmit (TX) processor 1012 implements various signal processing functions for the L1 layer (ie, the physical layer). The signal processing function facilitates forward error correction (FEC) in the terminal and includes coding and interleaving. The encoded and modulated symbols are divided into parallel streams, each stream mapped to an OFDM subcarrier, multiplexed with a reference signal (RS) in the time and / or frequency domain, and using an Inverse Fast Fourier Transform (IFFT). To be combined together to create a physical channel carrying a time-domain OFDMA symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Each spatial stream may be provided to different antennas 1016 through separate Tx / Rx modules (or transceivers 1015). Each Tx / Rx module can modulate an RF carrier with each spatial stream for transmission. At the terminal, each Tx / Rx module (or transceiver) 1025 receives a signal through each antenna 1026 of each Tx / Rx module. Each Tx / Rx module recovers information modulated onto an RF carrier and provides it to a receive (RX) processor 1023. The RX processor implements the various signal processing functions of layer 1. The RX processor may perform spatial processing on the information to recover any spatial stream destined for the terminal. If multiple spatial streams are directed to the terminal, they may be combined into a single OFDMA symbol stream by multiple RX processors. The RX processor uses fast Fourier transform (FFT) to convert the OFDMA symbol stream from the time domain to the frequency domain. The frequency domain signal includes a separate OFDMA symbol stream for each subcarrier of the OFDM signal. The symbols and reference signal on each subcarrier are recovered and demodulated by determining the most likely signal placement points sent by the base station. Such soft decisions may be based on channel estimate values. Soft decisions are decoded and deinterleaved to recover the data and control signals originally sent by the base station on the physical channel. Corresponding data and control signals are provided to the processor 1021.

The UL (communication from terminal to base station) is processed at base station 1010 in a manner similar to that described with respect to receiver functionality at terminal 1020. Each Tx / Rx module 1025 receives a signal through each antenna 1026. Each Tx / Rx module provides an RF carrier and information to the RX processor 1023. The processor 1021 may be associated with a memory 1024 that stores program code and data. The memory may be referred to as a computer readable medium.

In the present specification, the wireless device includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, Robots, Augmented Reality (AR) devices, Virtual Reality (VR) devices, MTC devices, IoT devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, or other areas of the fourth industrial revolution, or It may be a device related to the 5G service. For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the MTC device and the IoT device are devices that do not require human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart bulbs, door locks, various sensors, and the like. For example, a medical device is a device used to examine, replace, or modify a device, structure, or function used for diagnosing, treating, alleviating, treating, or preventing a disease, such as a medical device, a surgical device, ( In vitro) diagnostic devices, hearing aids, surgical devices, and the like. For example, the security device is a device installed to prevent a risk that may occur and maintain safety, and may be a camera, a CCTV, a black box, or the like. For example, the fintech device is a device that can provide financial services such as mobile payment, and may be a payment device or a point of sales (POS). For example, the climate / environmental device may mean a device for monitoring and predicting the climate / environment.

In the present specification, the terminal is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet PC. (tablet PC), ultrabook, wearable device (e.g. smartwatch, glass glass, head mounted display), foldable device And the like. For example, the HMD is a display device of a type worn on the head and may be used to implement VR or AR.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to combine the some components and / or features to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the embodiments can be combined to form a new claim by combining claims which are not expressly cited in the claims or by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The method of transmitting and receiving channel state information in the wireless communication system of the present invention has been described with reference to examples applied to 3GPP LTE / LTE-A system and 5G system (New RAT system), but can be applied to various wireless communication systems. Do.

Claims

A method for a terminal to report channel state information in a wireless communication system,

Receiving a Channel State Information-Reference Signal (CSI-RS) for the CSI report; And

Transmitting the CSI calculated based on the CSI-RS to a base station;

The terminal supports one or more CSI processing units,

If the number of CSI reports set to the terminal is greater than the number of CSI processing units that are not occupied by the terminal, the calculation of the CSI is performed according to a preset priority. .
The method of claim 1,

The predetermined priority is set, based on a processing time (processing time) for the CSI.
The method of claim 2,

The processing time is i) a first processing time which is a time from a triggering time of the CSI report to a time of performing the CSI report, or ii) from a time of receiving the CSI-RS to a time of performing the CSI report. And a second processing time, which is time.
The method of claim 3, wherein

When the number of CSI processing units not occupied by the terminal is M, M CSI reports that minimize the sum of the first processing time or the sum of the second processing time among one or more CSI reports set to the terminal are Characterized in that it is allocated to M CSI processing units.
The method of claim 3, wherein

And a CSI processing unit not occupied by the terminal is allocated to a CSI that satisfies the first processing time or the second processing time of one or more CSI reports set for the terminal.
The method of claim 1,

And the preset priority is set based on a latency requirement for the CSI.
The method of claim 1,

The preset priority is set based on an operation type on the time domain of the CSI-RS.

Wherein the type of operation on the time domain is one of periodic, semi-persistent, or aperiodic.
The method of claim 1,

The preset priority is set based on whether a measurement restriction on calculation of the CSI is set.
The method of claim 1,

If the CSI-RS is an aperiodic CSI-RS, the preset priority is set based on a time point of a last symbol of the CSI-RS.
A terminal for performing channel state information reporting in a wireless communication system,

RF (Radio Frequency) unit for transmitting and receiving radio signals,

A processor functionally connected with the RF unit,

The processor,

Receive a Channel State Information-Reference Signal (CSI-RS) for the CSI reporting;

Control to transmit the CSI calculated based on the CSI-RS to a base station;

The terminal supports one or more CSI processing units,

When the number of CSI reports set to the terminal is larger than the number of CSI processing units not occupied by the terminal, the calculation of the CSI is performed according to a preset priority. .
The method of claim 10,

The preset priority is set, based on the processing time (processing time) for the CSI.
The method of claim 11,

The processing time is i) a first processing time which is a time from a triggering time of the CSI report to a time of performing the CSI report, or ii) from a time of receiving the CSI-RS to a time of performing the CSI report. And a second processing time which is a time.
The method of claim 12,

When the number of CSI processing units not occupied by the terminal is M, M CSI reports that minimize the sum of the first processing time or the sum of the second processing time among one or more CSI reports set to the terminal are A terminal characterized by being allocated to M CSI processing units.
The method of claim 12,

And a CSI processing unit not occupied by the terminal is allocated to a CSI that satisfies the first processing time or the second processing time of one or more CSI reports set for the terminal.
A base station for receiving channel state information in a wireless communication system,

RF (Radio Frequency) unit for transmitting and receiving radio signals,

A processor functionally connected with the RF unit,

The processor,

Transmit a Channel State Information-Reference Signal (CSI-RS) for the CSI reporting;

Controlling to receive from the terminal a CSI calculated based on the CSI-RS;

The terminal supports one or more CSI processing units,

If the number of CSI reports set to the terminal is greater than the number of CSI processing units not occupied by the terminal, the calculation of the CSI is performed according to a preset priority (priority) .