WO2020060375A1 - Method for transmitting and receiving data in wireless communication system and apparatus therefor - Google Patents

Abstract

The present specification relates to a method for transmitting and receiving data by a base station in a wireless communication system. More specifically, the base station transmits downlink control information (DCI) to a terminal, wherein the DCI may include first mapping information associated with mapping relationships between a plurality of layers and a plurality of codewords, and second mapping information associated with mapping relationships between a plurality of antenna ports and the plurality of layers. The base station transmits a first codeword and a second codeword to the terminal on the basis of the DCI, wherein the first codeword and the second codeword may be mapped with the plurality of layers according to the first mapping information, and the plurality of layers may be mapped with the plurality of antenna ports according to the second mapping information.

Description

Method for transmitting and receiving data in wireless communication system and apparatus therefor

The present invention relates to a method for transmitting and receiving data in a wireless communication system, and more particularly, to a method for transmitting and receiving data through two codewords and an apparatus supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, the mobile communication system has expanded not only to voice but also to data services, and now, due to the explosive increase in traffic, a shortage of resources is caused and users demand higher speed services, so a more advanced mobile communication system is required. .

The requirements of the next-generation mobile communication system are to support the explosive data traffic, the dramatic increase in the transmission rate per user, the largely increased number of connected devices, the very low end-to-end latency, and high energy efficiency. It should be possible. To this end, dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), and super-wideband Various technologies such as wideband support and device networking have been studied.

This specification proposes a method for transmitting and receiving data in a wireless communication system.

In addition, this specification proposes a method for transmitting a plurality of codewords and defining a mapping relationship between a plurality of codewords and a plurality of layers and transmitting them to a terminal.

In addition, this specification proposes a method for establishing a mapping relationship between a plurality of layers and a plurality of antenna ports.

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

In the present specification, a method for a terminal to estimate a channel in a wireless communication system supporting machine type communication (MTC), the method comprising: transmitting downlink control information (DCI) to the terminal, the DCI Includes first mapping information related to a mapping relationship between a plurality of codewords and a plurality of layers and second mapping information related to a mapping relationship between the plurality of layers and a plurality of antenna ports; And transmitting a first codeword and a second codeword to the terminal based on the DCI, wherein the first codeword and the second codeword are associated with the plurality of layers according to the first mapping information. It is mapped, and the plurality of layers provides a method characterized by being mapped to the plurality of antenna pods according to the second mapping information.

In addition, in the present invention, the first mapping information and the second mapping information are co-encoded (jointly ending) and included in the DCI.

In addition, in the present invention, the plurality of antenna ports are included in a plurality of antenna port groups based on a multiplexing method.

Further, in the present invention, at least one antenna port included in the same antenna port group among the plurality of antenna port groups is mapped to the same codeword among the first codeword or the second codeword.

In addition, in the present invention, the plurality of antenna ports includes the same number in each of the plurality of antenna port groups.

In addition, in the present invention, the plurality of antenna ports are multiplexed through code division multiplexing on the time axis and / or frequency axis.

In addition, in the present invention, the first codeword and the second codeword are transmitted through different channels on different transmit points (TPs).

Further, in the present invention, at least one layer mapped to the first codeword or the second codeword among the plurality of layers is at least one antenna multiplexed through different CDM methods among the plurality of antenna pods. It is mapped to the port.

In addition, the present invention, receiving the downlink control information (downlink control information (DCI)) from the base station, the DCI is a plurality of codewords and the first mapping information related to the mapping relationship between the plurality of layers and the plurality Second mapping information related to a mapping relationship between layers and a plurality of antenna ports; And receiving a first codeword and a second codeword from the base station based on the DCI, wherein the first codeword and the second codeword are associated with the plurality of layers according to the first mapping information. It is mapped, and the plurality of layers provides a method characterized by being mapped to the plurality of antenna pods according to the second mapping information.

In addition, the present invention, an RF module for transmitting and receiving a radio signal (radio frequency module); And

A processor functionally connected to the RF module, wherein the processor transmits downlink control information (DCI) to the UE, wherein the DCI is a mapping between a plurality of codewords and a plurality of layers. It includes first mapping information related to a relationship and second mapping information related to a mapping relationship between the plurality of layers and a plurality of antenna ports, and transmits a first codeword and a second codeword to the terminal based on the DCI. However, the first codeword and the second codeword are mapped to the plurality of layers according to the first mapping information, and the plurality of layers are mapped to the plurality of antenna pods according to the second mapping information. It provides a base station characterized in that the.

In this specification, in a method for transmitting a plurality of codewords, by defining a mapping relationship between a plurality of codewords and a plurality of layers, it is possible to transmit each codeword through different channels.

In addition, the present specification has an effect of efficiently transmitting codewords by applying appropriate parameters according to channel conditions by transmitting each codeword through different channels.

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. .

Included as part of the detailed description to aid understanding of the present invention, the accompanying drawings provide embodiments of the present invention and describe the technical features of the present invention together with the detailed description.

1 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

2 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can be applied.

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

4 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.

5 is a diagram illustrating an SSB structure to which the present invention can be applied.

6 shows an example of a block diagram of a transmitter composed of an analog beamformer and an RF chain.

7 shows an example of a block diagram of a transmitting end composed of a digital beamformer and an RF chain.

8 shows an example of an analog beam scanning method.

9 is a view comparing a beam scanning application method.

10 is a diagram showing an RACH procedure.

11 shows an example of the overall RACH procedure.

12 is a diagram showing an example of a TA.

13 shows an example of retransmission of MSG3 and MSG4 transmission.

14 shows a concept of a threshold value of an SS block for RACH resource association.

15 is a diagram showing an example of a change in the power ramping count in the RACH procedure.

16 is a flowchart illustrating an example of a codeword transmission method of a base station to which the method proposed in this specification can be applied.

17 is a flowchart illustrating an example of a method for receiving a codeword of a terminal to which the method proposed in this specification can be applied.

18 is a flowchart illustrating an example of a codeword transmission method of a base station in an initial access process to which the method proposed in this specification can be applied.

19 is a flowchart illustrating an example of a method for receiving a codeword of a terminal in an initial access process to which the method proposed in this specification can be applied.

20 is a flowchart illustrating an example of a method of transmitting a codeword of a base station in a handover process to which the method proposed in this specification can be applied.

21 is a flowchart illustrating an example of a method for receiving a codeword of a terminal in a handover process to which the method proposed in this specification can be applied.

22 is a flowchart illustrating an example of a data transmission method of a base station to which the method proposed in this specification can be applied.

23 is a flowchart illustrating an example of a method for receiving data by a terminal to which the method proposed in this specification can be applied.

24 illustrates a communication system applied to the present invention.

25 illustrates a wireless device that can be applied to the present invention.

26 shows another example of a wireless device applied to the present invention.

27 illustrates a portable device applied to the present invention.

28 illustrates an AI device applied to the present invention.

29 illustrates an AI server applied to the present invention.

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar reference numerals are assigned to the same or similar elements, and overlapping descriptions thereof will be omitted. The suffixes "modules" and "parts" for the components used in the following description are given or mixed only considering the ease of writing the specification, and do not have meanings or roles distinguished from each other in themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed herein, detailed descriptions thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. Certain operations described in this document as being performed by a base station may be performed by an upper node of the base station in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a base station or other network nodes other than the base station. 'Base station (BS)' is a term such as a fixed station (fixed station), Node B, evolved-NodeB (eNB), base transceiver system (BTS), access point (AP), general NB (gNB), etc. Can be replaced by In addition, the 'terminal (Terminal)' may be fixed or mobile, UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS ( It can be replaced with terms such as Advanced Mobile Station (WT), Wireless terminal (WT), Machine-Type Communication (MTC) device, Machine-to-Machine (M2M) device, and Device-to-Device (D2D) device.

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 the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

Certain terms used in the following description are provided to help understanding of the present invention, and the use of these specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following technologies are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA. (non-orthogonal multiple access), and the like. CDMA may be implemented by radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with radio 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 with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). The 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using E-UTRA, and adopts OFDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts that are not described in order to clearly reveal the technical idea of the present invention among the embodiments of the present invention may be supported by the documents. Also, all terms disclosed in this document may be described by the standard document.

For clarity, 3GPP LTE / LTE-A / NR (New Radio) is mainly described, but the technical features of the present invention are not limited thereto.

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

Some use cases may require multiple areas for optimization, and other use cases may focus on only one key performance indicator (KPI). 5G is a flexible and reliable way to support these various use cases.

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 for the first time in the 5G era, dedicated voice services may not be seen. In 5G, it is expected that voice will be processed as an application program simply using the data connection provided by the communication system. The main causes for increased traffic volume are increased content size and increased number of applications requiring high data rates. Streaming services (audio and video), interactive video and mobile internet connections will become more widely used as more devices connect to the internet. Many of these applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are rapidly increasing 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 transfer rate. 5G is also used for remote work in the cloud, requiring much lower end-to-end delay to maintain a good user experience when a tactile interface is used. Entertainment For example, cloud gaming and video streaming are another key factor in increasing demand for mobile broadband capabilities. Entertainment is essential for smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires a very low delay and an instantaneous amount of data.

In addition, one of the most anticipated 5G use cases is the ability to seamlessly connect embedded sensors in all fields, namely mMTC. It is predicted that by 2020, there will be 20.4 billion potential IoT devices. Industrial IoT is one of the areas where 5G plays a key role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC includes new services that will transform the industry through ultra-reliable / low-latency links, such as remote control of the main infrastructure and self-driving vehicles. Reliability and level of delay are 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 to provide streams rated at hundreds of megabits per second to gigabit per second. This fast speed is required to deliver TV in 4K (6K, 8K and higher) resolutions as well as virtual and augmented reality. Virtual Reality (VR) and Augmented Reality (AR) applications include almost immersive sports events. Certain application programs may require special network settings. For VR games, for example, game companies may need to integrate the core server with the network operator's edge network server to minimize latency.

Automotive is expected to be an important new driver for 5G, along with many use cases 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 example of application in the automotive field is the augmented reality dashboard. It identifies objects in the dark over what the driver sees through the front window, and superimposes and displays information telling the driver about the distance and movement of the object. In the future, wireless modules will enable communication between vehicles, exchange of information between the vehicle and the supporting infrastructure and exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians). The safety system helps the driver to reduce the risk of accidents by guiding alternative courses of action to make driving safer. The next step will be remote control or a self-driven vehicle. This requires very reliable and very fast communication between different self-driving vehicles and between the vehicle and the infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will focus only on traffic beyond which the vehicle itself cannot identify. The technical requirements of self-driving vehicles require ultra-low delays and ultra-high-speed reliability to increase traffic safety to levels beyond human reach.

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 assumption. Temperature sensors, window and heating controllers, burglar alarms and consumer electronics 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 a distributed sensor network. The smart grid interconnects these sensors using digital information and communication technologies to collect information and act accordingly. This information can include supplier and consumer behavior, so smart grids can improve efficiency, reliability, economics, production sustainability and distribution of fuels like electricity in an automated way. The 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 can support telemedicine that provides clinical care from a distance. This can help reduce barriers to distance and improve access to medical services that are not continuously available in remote rural areas. It is also used to save lives in critical care and emergency situations. A wireless sensor network based on mobile communication 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 cables with wireless links that can be reconfigured is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with cable-like delay, reliability and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected to 5G.

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

The present invention, which will be described later in this specification, may be implemented by combining or changing each embodiment to satisfy the above-described requirements of 5G.

Term Definition

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

gNB: A node that supports NR as well as a connection with NGC.

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

Network slice: A network slice is a network defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements along 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 NG3 reference point between new RAN and NGC.

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

Non-standalone E-UTRA: Deployment configuration where eLTE eNB requires gNB as an anchor for control plane connection to NGC.

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

System general

1 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

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

The gNBs are interconnected through an Xn interface.

The gNB is also connected to the NGC through the NG interface.

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

NR (New Rat) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Here, the numerology may be defined by subcarrier spacing and CP (Cyclic Prefix) overhead. At this time, a plurality of subcarrier intervals is the default subcarrier interval N (or,

) Can be derived by scaling. Further, even if it is assumed that a very low subcarrier spacing is not used at a very high carrier frequency, the numerology used can be selected independently of the frequency band.

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

Hereinafter, an orthogonal frequency division multiplexing (OFDM) numerology and a frame structure that can be considered in an NR system will be described.

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

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

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

ego,

to be. Downlink (downlink) and uplink (uplink) transmission is

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

It consists of 10 subframes (subframes) having an interval of. In this case, there may be one set of frames for uplink and one set of frames for downlink. FIG. 2 shows an uplink frame and a downlink frame in a wireless communication system to which a method proposed in the present specification can be applied. It shows the relationship between.

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

You have to start earlier.

New Merology

For, slots are within a subframe

Numbered in increasing order, within the radio frame

It is numbered in increasing order. One slot

Consisting 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

It is aligned with the start of time.

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

Table 2 is pneumatic

Table 3 shows the number of OFDM symbols per slot for a normal CP in Table 3.

Represents the number of OFDM symbols per slot for an extended CP in.

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

), The number of slots per radio frame (

), 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.

NR  Physical resource ( NR  Physical Resource)

With respect 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 can be considered in the NR system will be described in detail.

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

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

Referring to Figure 3, the resource grid is on the frequency domain

It is configured by subcarriers, one subframe is composed of 14 · 2μOFDM symbols as an example, but is not limited thereto.

In the NR system, the transmitted signal is

One or more resource grids consisting of subcarriers and

It is described by the OFDM symbols of. From here,

to be. remind

Denotes a maximum transmission bandwidth, which may vary between uplink and downlink as well as numerology.

In this case, as shown in Fig. 4, the numerology

And one resource grid for each antenna port p.

4 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.

New Merology

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

It is uniquely identified by. From here,

Is an index on the frequency domain,

Indicates the position of the symbol in the subframe. When referring to a resource element in a slot, an index pair

Is used. From here,

to be.

New Merology

And resource elements for antenna port p

Is the complex value

Corresponds to If there is no risk of confusion, or if a specific antenna port or numerology is not specified, the indexes p and

Can be dropped, resulting in a complex value

or

Can be

In addition, a physical resource block (physical resource block) on 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 PCell downlink indicates the frequency offset between the lowest sub-carrier and point A of the lowest resource block overlapping the SS / PBCH block used by the UE for initial cell selection, 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;

-absoluteFrequencyPointA represents the frequency-position of point A expressed as in an absolute radio-frequency channel number (ARFCN).

Common resource blocks set the subcarrier interval

It is numbered upward from 0 in the frequency domain for.

Subcarrier spacing setting

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

And subcarrier spacing settings

The resource element for (k, l) can be given as in Equation 1 below.

From here,

The

It can be defined relative to point A to correspond to a subcarrier centered on point A. Physical resource blocks start from 0 within a bandwidth part (BWP).

Numbered up to,

Is the number of the BWP. Physical resource block in BWP i

And common resource blocks

The relationship between can be given by Equation 2 below.

From here,

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

Uplink control channel

Physical uplink control signaling should be able to carry at least hybrid-ARQ acknowledgment, CSI report (including beamforming information if possible), and scheduling request.

At least two transmission methods are supported for an UL control channel supported by the NR system.

The uplink control channel may be transmitted in a short duration around the last transmitted uplink symbol (s) of the slot. In this case, the uplink control channel is time-division-multiplexed and / or frequency-division-multiplexed with the UL data channel in the slot. For a short-term uplink control channel, 1 symbol unit transmission of a slot is supported.

-Short Uplink Control Information (UCI) and data are frequency-divided between a UE and UEs when physical resource blocks (PRBs) for at least short UCI and data do not overlap. -It is multiplexed.

-In order to support time division multiplexing (TDM) of short PUCCH (short PUCCH) from different terminals in the same slot, whether the symbol (s) in the slot to transmit the short PUCCH is supported at least 6 GHz or more. Mechanism to inform the terminal is supported.

-At least 1 for a 1-symbol duration) When a reference signal (RS) is multiplexed, UCI and RS are multiplexed to a given OFDM symbol by frequency division multiplexing (FDM); and 2) The same subcarrier spacing between downlink (DL) / uplink (UL) data and short-term PUCCH is supported in the same slot.

-At least, short-term PUCCH over a 2-symbol duration of a slot is supported. At this time, the subcarrier interval between the downlink (DL) / uplink (UL) data and the short-term PUCCH in the same slot is the same.

At least, a PUCCH resource of a given UE in a slot, that is, short PUCCHs of different UEs, is supported in a semi-static configuration in which time division multiplexing can be performed within a given duration in a slot.

-The PUCCH resource includes a time domain, a frequency domain, and a code domain when applicable.

-Short-term PUCCH can be extended to the end of the slot from the perspective of the terminal. At this time, after the short-term PUCCH, an explicit gap symbol is unnecessary.

-For a slot having a short UL part (ie, a DL-centric slot), if data is scheduled in a short UL part, 'short UCI' and one data It can be multiplexed by frequency division by the terminal of the.

The uplink control channel may be transmitted in a long-duration over a plurality of uplink symbols to improve coverage. In this case, the uplink control channel is frequency-division multiplexed with the uplink data channel in the slot.

-UCI carried by a long duration UL control channel (PACI) with a low PAPR (Peak to Average Power Ratio) design may be transmitted in one slot or multiple slots.

-Transmission using multiple slots is allowed for a total duration (eg, 1 ms) in at least some cases.

-For a long time uplink control channel, time division multiplexing (TDM) between RS and UCI is supported for DFT-S-OFDM.

-The long UL part of the slot may be used for long PUCCH transmission. That is, a long PUCCH is supported for both an uplink-only slot and a slot having a variable number of symbols composed of at least 4 symbols.

-For at least 1 or 2 bit UCI, the UCI may be repeated in N slots (N> 1), and the N slots may or may not be contiguous in slots in which a long PUCCH is allowed. .

-Simultaneous transmission of PUSCH and PUCCH is supported for at least long PUCCH. That is, even when data exists, uplink control for PUCCH resources is transmitted. In addition, UCI in PUSCH is supported in addition to simultaneous PUCCH-PUSCH transmission.

*-Intra-TTI slot frequency hopping within TTI is supported.

-DFT-s-OFDM waveform is supported.

-Transmit antenna diversity is supported.

TDM and FDM between short-term PUCCH and long-term PUCCH are supported for other terminals in at least one slot. In the frequency domain, PRB (or multiple PRBs) is a minimum resource unit size for an uplink control channel. When hopping is used, frequency resources and hopping may not be spread with carrier bandwidth. In addition, the terminal specific RS is used for NR-PUCCH transmission. The set of PUCCH resources is set by higher layer signaling, and PUCCH resources in the set are indicated by downlink control information (DCI).

As part of the DCI, the timing between data reception and hybrid-ARQ acknowledgment transmission should be able to be indicated dynamically (at least with RRC). The combination of semi-static configuration and dynamic signaling (at least for some types of UCI information) is used to determine PUCCH resources for 'long and short PUCCH format'. Here, the PUCCH resource includes a time domain, a frequency domain, and a code domain if applicable. The use of UCI on PUSCH, i.e., some of the scheduled resources for UCI, is supported in case of simultaneous transmission of UCI and data.

In addition, at least uplink transmission of a single HARQ-ACK bit is supported. In addition, a mechanism for enabling frequency diversity is supported. In addition, in the case of URLLC (Ultra-Reliable and Low-Latency Communication), a time interval between scheduling request (SR) resources set for the terminal may be smaller than one slot.

Downlink shared channel (Physical downlink  shared channel: PUSCH )

Up to two codewords q∈ {0,1} can be transmitted, and in the case of a single codeword transmission, the value of q is 0.

For each codeword, the terminal blocks the bits

Suppose, here

Is the number of bits of codeword q transmitted on the physical channel. The block of bits is scrambled before modulation, and the scrambled bit block according to Equation 3 below

This is created.

In Equation 3, c ^(q) (i) is a scrambling sequence, and the scrambling sequence generator is initialized by Equation 4 below.

In Equation 4, n _ID ∈ {0,1, ..., 1023} is the same when the upper layer parameter dataScramblingIdentityPDSCH is set, and RNTI is the same as C-RNTI or CS-RNTI, and transmission is a common search interval It is not scheduled using DCI format 1_0 in (common search space).

If not,

to be.

And, n _RNTI corresponds to the RNTI associated with PDSCH transmission.

Modulation

For codeword q, the terminal is scrambled bit block

It is assumed that the modulation is performed using one of the modulation methods in Table 4 below.

At this time, the block of symbols modulated with the complex value

It can be like

Layer Mapping

The terminal assumes that the complex value modulation symbol for each codeword to be transmitted can be mapped to one or several layers according to Table 5 below.

Vector block

about,

Is mapped to antenna pods according to Equation 5 below.

In Equation 5

ego,

to be. Three of the antenna ports

to be.

email resource  On the block Mapping (Mapping to virtual resource blocks)

The terminal has complex value symbols for each of the antenna pods used for the transmission of the physical channel.

In the virtual resource block allocated for transmission following the downlink power allocation and following conditions, starting from y ^(p) (0) and sequentially mapped to resource elements (k ', l) _{p, u} .

-Exists in a virtual resource block allocated for transmission.

-Declared as available for PDSCH.

-The resource element corresponding to the physical resource blocks

-Not used for transmission of related DM-RS or DM-RS for other co-scheduled terminals.

-Not used for non-zero power CSI-RS except for non-zero power CSI-RS configured with upper layer parameter CSI-RS-Resource-Mobility in MeasObjectNR IE.

-Not used for PT-RS.

-Not declared as unavailable to PDSCH.

Any common resource block that partially or completely overlaps the SS / PBCH block is considered occupied, and is not used for the transmission of the PDSCH in the OFDM symbol in which the SS / PBCH block is transmitted.

The mapping for resource elements (k ', l) _{p, u} allocated to PDSCH and not pre-empted for other purposes is first increased in the order of index k' for the allocated virtual resource block, where k '= 0 Is the lowest index virtual resource block allocated for transmission and the first subcarrier at index l.

email In resources  physical resource  In blocks Mapping (Mapping from virtual to physical resource blocks)

The UE should assume that the virtual resource block is mapped to the physical resource block according to the indicated mapping scheme, non-interleaved or interleaved mapping. If the mapping scheme is not indicated, the UE should assume a non-interleaved mapping.

For non-interleaved VRB-toPRB mapping, virtual resource block n is physical resource block

When mapped to, virtual resource block n is mapped to physical resource block n except for PDSCH transmission scheduled in DCI format 1_0 in the common discovery period.

At this time,

Is the lowest numbered physical resource block in the set of control resources for which DCI is received.

For interleaved VRB-to-PRB mapping, the mapping process is defined as a resource block bundle.

-Starting position

Resource block in bandwidth part (BWP) i for

The set of is in the order of increasing resource block number and bundle number.

It is divided into resource block bundles. L _i is the bundle size for the bandwidth part i provided by the upper layer parameter vrb-ToPRB-Interleaver,

-Resource block bundle 0

It consists of resource blocks.

-

Or, if L _i is not, the resource block bundle L _bundle is

It consists of.

-All other resource block bundles are composed of L _i resource blocks.

-Spacing

The virtual resource blocks are mapped to physical resource blocks according to the following.

-The virtual resource block bundle N _bundle -1 is mapped to the physical resource block bundle N _bundle -1.

-Virtual resource block bundle

Is mapped to the physical resource block bundle f (j), where each parameter value is expressed by Equation 6 below.

If the PRB size is 4, the UE does not assume L _i = 2, and if any bundle size is not set, it is assumed that L _i = 2.

The UE can assume that the same precoding in the frequency domain is used in the PRB bundle. However, the UE should not assume that the same precoding is used for different common resource block bundles.

DCI  Format 1_1

DCI format 1_1 may be used for scheduling of PDSCH in one cell.

The following information may be transmitted through DCI format 1_1 for CRC scrambled by a new RNTI, CS-RNTI or C-RNTI.

-Identifier for DCI format: 1 bits

-The value of this bit field is always set to 1 to indicate DL DCI format.

-Carrier indicator: 0 or 3 bits

-Bandwidth part indicator: 0, 1 or 2 bits determined by the number of DL BWP n _{BWP, RRC} configured by the upper layer except for the initial DL bandwidth part. The bit width of this field is determined by B bits. here,

_-If , n _BWP = n _{BWP, RRC} +1, in this case, the bandwidth part indicator is defined in Table 6.

If the UE does not support active BWP change through DCI, the UE ignores this bit field.

-Frequency domain resource allocation-number of bits determined by below, where

Is the size of the active DL bandwidth portion.

_-If resource allocation type 0 is set, it is determined by N _RBG bit.

-If resource allocation type 1 is set,

Determined in bits.

-If set to resource allocation type 0 and 1,

Decided.

-If both resource allocation types 0 and 1 are configured, the MSB bit is used to indicate resource allocation type 0 or resource allocation type 1. Here, the bit value 0 indicates resource allocation type 0 and the bit value 1 indicates resource allocation type 1.

_-For resource allocation type 0, N _RBG provides resource allocation.

-For resource allocation type 1,

Provides resource allocation.

If the "bandwidth portion indicator" field indicates a bandwidth portion other than the active bandwidth portion, and if resource allocation types 0 and 1 are configured for the indicated bandwidth portion, the UE allocates resource allocation type 0 for the bandwidth portion indicated when the bit width is Suppose The "frequency domain resource allocation" field of the active bandwidth portion is smaller than the bit width of the "frequency domain resource allocation" field of the displayed bandwidth portion.

-Time domain resource allocation: 0, 1, 2, 3, or 4 bits. The bandwidth for this field

Determined in bits, where I is the number of items in the upper layer parameter pdsch-AllocationList.

-VRB-to-PRT mapping: 0 or 1 bit

-0 bit only when resource allocation type 0 is set

-1 bit.

-PRB bundling size indicator: 0 bits if the upper layer parameter prb-BundlingType is not configured or set to 'static', 1 bit if the upper layer parameter prb-BundlingType is set to 'dynamic'.

-Rate matching indicator: 0, 1, or 2 bits according to the upper layer parameter rateMatchPattern

-ZP CSI-RS trigger: 0, 1 or 2 bits. The bandwidth for this field

Determined in bits, where n _ZP is the ZP CSI-RS resource sets in the upper layer parameter zp-CSI-RS-Resource.

Transport block 1:

-Modulation and coding method: 5 bits

-New data indicator (NDI): 2 bits

Transport block 2 (exists when maxNrofCodeWordsScheduledByDCI equals 2)

-Modulation and coding method: 5 bits

-New data indicator (NDI): 1 bit

-Redundancy version-2 bits

If the "bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and the value of maxNrofCodeWordsScheduledByDCI for the displayed bandwidth part is 2 and the value of maxNrofCodeWordsScheduledByDCI for the active bandwidth part is 1, the UE assumes that 0 is filled in interpretation. . The UE ignores the "modulation and coding scheme", "new data indicator" and "duplicate version" fields of transport block 2 for the indicated bandwidth portion.

-HARQ procedure number: 4 bits

-Downlink allocation index: the number of bits shown below

-When one or more cells are configured in the downlink and the upper layer parameter pdsch-HARQ-ACK-Codebook = dynamic, 4 bits, where 2 MSB bits are counter DAI and 2 LSB bits are total DAI.

-When only one cell is set to DL and the upper layer parameter pdsch-HARQ-ACK-Codebook = dynamic, 2 bits, where 2 bits is the counter DAI.

-Otherwise, 0 bit

-TPC command for scheduled PUCCH: 2 bits

-PUCCH resource indicator: 3bits

-PDSCH-to-HARQ feedback timing indicator: 0, 1, 2, or 3 bits. The bandwidth for this field

Is determined, where I is the number of items in the upper layer parameter dl-DataToUL-ACK.

-Antenna port (s): 4, 5 or 6 bits defined by the table below, where the number of CDM groups without data of values 1, 2 and 3 are individually CDM groups {0}, {0,1} and {0, 1,2}. Antenna port

Is determined according to the order of the DMRS ports.

If the UE is configured with both dmrs-DownlinkForPDSCH-MappingTypeA and dmrs-DownlinkForPDSCH-MappingTypeB, the bit width of this field is max {x _A , x _B }. Here, x _A is the "Antenna port" bit width derived according to dmrs-DownlinkForPDSCH-MappingTypeA, x _B is the "Antenna port" bit width derived according to dmrs-DownlinkForPDSCH-MappingTypeB. If the mapping type of PDSCH corresponds to smaller D and E values, MSC of this field is filled with many C 0s.

-Transmission setting indicator: 0 bit if upper layer parameter tci-PresentInDCI is not enabled, otherwise 3bit

-If the "bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and the "transport configuration indication" field does not exist in DCI format 1_1, the UE assumes that tci-PresentInDCI is not activated for the indicated bandwidth part. .

-SRS request: If the UE is not configured for SUl in the cell, 2 bits, the first bit is a non-SUL / SUL indicator, and the second and third bits are set, 3 bits. This bit field may indicate an associated CSI-RS.

-CBG transmission information (CGBTI): 0, 2, 4, 6 or 8 bits, determined by upper layer parameters maxCodeBlockGroupsPerTransportBlock and Number-MCS-HARQ-DL-DCI for PDSCH.

-CGB flushing out information (CBGFI): 0 or 1 bit, determined by upper layer parameter codeBlockGroupFlushIndicator

-DMRS sequence initialization: 1 bit when both scramblingID0 and scramblingID1 are configured in DMRS-DownlinkConfig; 0 bits otherwise.

When DCI format 1_1 monitors DCI format 1_1 in multiple search spaces associated with multiple CORESETs, 0 is output until the payload size of DCI form bird 1_1 monitored in multiple search spaces equals the maximum payload size of DCI format 1_1 monitored. Can be added.

Table 6 shows the case where the antenna pods are 1000+ DMRS pods, the DMRS type is 1, and the maxLenth is 1.

Table 7 is a case where the antenna pods are 1000+ DMRS pods, and the DMRS type is 1 and maxLenth is 2.

Table 8 is a case where the antenna pods are 1000+ DMRS pods, the DMRS type is 2, and the maxLenth is 1.

Table 9 shows the case where the antenna pods are 1000+ DMRS pods, the DMRS type is 2, and the maxLenth is 2.

Cell navigation

Cell search is a procedure in which the UE acquires time and frequency synchronization with a cell and detects the physical layer cell ID of the cell. The UE receives the following synchronization signal (SS) to perform cell search: the primary synchronization signal (PSS) and the secondary synchronization signal (SSS).

The UE should assume that the reception points of the PBCH (Physical Broadcast Channel), PSS and SSS are continuous symbols to form an SS / PBCH block. The UE should assume that the SSS, PBCH DM-RS and PBCH data have the same EPRE. The UE can assume that the ratio of PSS EPRE to SSS EPRE in the SS / PBCH block of the corresponding cell is 0 dB or 3 dB.

The cell search procedure of the UE can be summarized in Table 10 below.

5 illustrates the SSB structure. The UE may perform cell search, system information acquisition, beam alignment for initial access, and DL measurement based on the SSB. SSB is mixed with SS / PBCH (Synchronization Signal / Physical Broadcast channel) block.

Referring to Figure 5, SSB is composed of PSS, SSS and PBCH. SSB is composed of four consecutive OFDM symbols, and PSS, PBCH, SSS / PBCH and PBCH are transmitted for each OFDM symbol. PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and PBCH is composed of 3 OFDM symbols and 576 subcarriers.

Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH. The PBCH is composed of a data RE and a DMRS (Demodulation Reference Signal) RE for each OFDM symbol. There are three DMRS REs for each RB, and three data REs exist between the DMRS REs.

hybrid Beam forming (Hybrid beamforming )

Existing beamforming techniques using multiple antennas are analog beamforming techniques and digital beams depending on where the beamforming weight vector / precoding vector is applied. It can be divided into a digital beamforming technique.

The analog beamforming technique is a beamforming technique applied to an initial multi-antenna structure. This is a method of forming a beam by branching an analog signal that has been processed digital signals into multiple paths, and then applying phase-shift (PS) and power amplifier (PA) settings for each path. Can mean

In order to form an analog beam, a structure is required in which PA and PS connected to each antenna process analog signals derived from a single digital signal. In other words, in the analog stage, the PA and the PS process complex weights.

6 shows an example of a block diagram of a transmitter composed of an analog beamformer and an RF chain. 5 is for convenience of description only and does not limit the scope of the present invention.

In FIG. 6, the RF chain means a processing block in which a baseband (BB) signal is converted into an analog signal. In the analog beam forming technique, beam accuracy is determined according to the characteristics of the elements of the PA and the PS, and may be advantageous for narrowband transmission due to the control characteristics of the elements.

In addition, in the case of the analog beam forming technique, since it is configured with a hardware structure that is difficult to implement multiple stream transmission, multiplexing gain for increasing the transmission rate is relatively small. Also, in this case, beam formation for each terminal based on orthogonal resource allocation may not be easy.

In contrast, in the case of a digital beamforming technique, beamforming is performed at a digital stage using a baseband (BB) process to maximize diversity and multiplexing gain in a MIMO environment.

7 shows an example of a block diagram of a transmitting end composed of a digital beamformer and an RF chain. 6 is for convenience of description only and does not limit the scope of the present invention.

In the case of FIG. 7, beam forming may be performed as precoding is performed in the BB process. Here, the RF chain includes a PA. This is because, in the case of a digital beamforming technique, complex weights derived for beamforming are directly applied to transmission data.

In addition, since different beamforming can be performed for each terminal, multiple user beamforming can be simultaneously supported. In addition, since independent beam formation is possible for each terminal to which orthogonal resources are allocated, scheduling flexibility is improved, and accordingly, it is possible to operate a transmitting end that meets the system purpose. In addition, when a technique such as MIMO-OFDM is applied in an environment supporting broadband transmission, an independent beam may be formed for each subcarrier.

Therefore, the digital beamforming technique can maximize the maximum transmission rate of a single terminal (or user) based on the system's capacity increase and enhanced beam gain. Based on the above-described features, a digital beamforming based MIMO technique has been introduced in an existing 3G / 4G (eg LTE (-A)) system.

In the NR system, a massive MIMO environment in which the transmit and receive antennas are greatly increased may be considered. In general, in cellular communication, it is assumed that the maximum transmit and receive antennas applied to the MIMO environment are eight. However, as a large MIMO environment is considered, the number of transmit / receive antennas may increase to tens or hundreds or more.

At this time, if the digital beamforming technique described above is applied in a large MIMO environment, the transmitter must perform signal processing for hundreds of antennas through a BB process for digital signal processing. Accordingly, the complexity of signal processing is very large, and the RF chain as many as the number of antennas is required, so the complexity of hardware implementation can also be very large.

In addition, the transmitting end needs independent channel estimation for all antennas. In addition, in the case of an FDD system, since the transmitting end needs feedback information for a large MIMO channel composed of all antennas, a pilot and / or feedback overhead may be very large.

On the other hand, if the analog beamforming technique described above is applied in a large MIMO environment, the hardware complexity of the transmitting end is relatively low.

On the other hand, the degree of increase in performance using multiple antennas is very small, and flexibility in resource allocation may be reduced. In particular, it is not easy to control a beam for each frequency in a broadband transmission.

Therefore, in a large MIMO environment, rather than exclusively selecting one of the analog beamforming and digital beamforming techniques, a hybrid-type transmission end configuration method in which the analog beamforming and digital beamforming structures are combined is required.

Analog beam scanning

In general, analog beamforming can be used in a pure analog beamforming transceiver and hybrid beamforming transceiver. At this time, analog beam scanning may perform estimation on one beam at the same time. Accordingly, the beam training time required for beam scanning is proportional to the total number of candidate beams.

As described above, in the case of analog beamforming, a beam scanning process in the time domain is necessarily required in order to estimate the transmission / reception end beams. At this time, the estimated time ts for the entire transmission / reception beam may be expressed as Equation 7 below.

In Equation 7, ts means the time required for one beam scanning, K _T means the number of transmit beams, and K _R means the number of receive beams.

8 shows an example of an analog beam scanning method.

In the case of FIG. 8, it is assumed that the total number of transmission beams K _T is L and the total number of reception beams K _R is 1. In this case, since the total number of candidate beams is a total of L, L time periods are required in the time domain.

In other words, since only one beam estimation can be performed in a single time interval for analog beam estimation, as shown in FIG. 10, L time intervals are required to perform all L beams P1 to PL estimation do. After the analog beam estimation procedure is finished, the terminal feeds back the identifier (eg ID) of the beam having the highest signal strength to the base station. That is, as the number of individual beams increases as the number of transmit and receive antennas increases, a longer training time may be required.

Since analog beamforming changes the size and phase angle of a continuous waveform in the time domain after a digital-to-analog converter (DAC), unlike digital beamforming, the training interval for individual beams needs to be guaranteed. There is. Therefore, as the length of the training section increases, the efficiency of the system may decrease (ie, the loss of the system increases).

9 is a view comparing a beam scanning application method. 9 (a) is an Exaustive search method and FIG. 9 (b) is a Multi-level search method.

The number of search spaces of the exaustive search method is shown in Table 11 below.

The number of search spaces of the multi-level search method is shown in Table 12 below.

In relation to the feedback, the Exaustive search method feeds back the best Tx beam ID. The multi-level search method feedbacks the best sector beam ID for the coarse beam and the best fine beam ID for the fine beam.

In relation to current industrial and standards, there are no related standards for the Exaustive search method, and there are 802.15.3c and 802.11 ad for the multi-level search method.

[1] J.Wang, Z. Lan, “Beam codebook based beamforming protocol for multi-Gbps millimeter-wave WPAN systems,” IEEE J. Select. Areas in Commun., Vol. 27, no. 8 [2] J.Kim, AFMolisch, “Adaptive Millimeter-Wave Beam Training for Fast Link Configuration,” USC CSI's 30th conference [3] T.Nitsche, “Blind Beam Steering: Removing 60 GHz Beam Steering Overhead,” It is done.

At NR  Reference signals in NR )

The DL (downlink) physical layer signal of the 3GPP NR system is as follows. For more details, refer to 3GPP TS 38.211 and TS 38.214.

-CSI-RS: signal for DL channel state information (CSI) acquisition, DL beam measurement

-TRS (tracking RS): Signal for fine time / frequency tracking of the terminal

-DL DMRS: RS for PDSCH demodulation

-DL PT-RS (phase-tracking RS): RS transmitted for phase noise compensation of the terminal

-Synchronization signal block (SSB): means a resource block composed of a specific number of symbols and resource blocks that are consecutive to the time / frequency side composed of primary synchronization signal (PSS), secondary SS and PBCH (+ PBCH DMRS) They apply the same beam)

In addition, UL (uplink) physical layer signal of the 3GPP NR system is as follows. Likewise, refer to 3GPP TS 38.211 and TS 38.214 for more details.

-SRS: Signal for UL channel state information (CSI) acquisition, UL beam measurement, antenna port selection

-UL DMRS: RS for PUSCH demodulation

-UL phase-tracking RS (PT-RS): RS transmitted for phase noise compensation of the base station

10, two types of RACH procedures will be described in NR.

FIG. 10 (a) is a contention-based RACH procedure, and FIG. 10 (b) is a contention-free RACH procedure.

11 shows an example of the overall RACH procedure.

First, the transmission of MSG1 will be described.

The subcarrier spacing for MSG1 is set in the RACH configuration and is provided in the handover command for the RA contention-free procedure for handover.

The preamble indexes for contention based random access (CBRA) and contention free random access (CFRA) are continuously mapped for one SSB in one RACH transmission opportunity.

-CBRA

: The association between the SS block (SSB) and a subset of RACH resources and / or preamble indexes within an SS burst set is set by a parameter set in RMSI.

-CFRA

: The UE may be configured to transmit multiple MSG1s through a dedicated multiple RACH transmission opportunity in the time domain before the end of the monitored RAR window.

And, the association between the CFRA preamble and the SSB is reset through UE-specific RRC.

Next, we will look at setting the random access response (MSG2).

The subcarrier spacing (SCS) for MSG2 is the same as the SCS of the maintenance minimum SI (RMSI).

And, for a non-competitive RA procedure for handover, it is provided in the handover command.

And, MSG2 is transmitted within the UE minimum DL BW.

The size of the RAR window is the same for all RACH opportunities and is set in the RMSI.

-Maximum window size: Depends on the worst gNB delay after receiving Msg1 including processing delay, scheduling delay, etc.

-Minimum window size: depends on duration of Msg2 or CORESET and scheduling delay.

Next, we will look at the timing advance (TA) command in MSG2.

Used to control the timing of uplink signal transmission.

First, in the case of LTE,

TA resolution is 16 Ts (Ts = 1 / (2048x15000)).

The TA range is 1282 x TA step size ~ 667.66. → 100.16

In the RAR, the timing advance (TA) has a value from 0 to 1,282, and consists of 11 bits.

For NR,

Used in TR38.913 for very long coverage (150Km to 300Km).

TA increases by 2,564 or 3,846 TA_steps (12its)

12 is a diagram showing an example of a TA.

RA-RNTI

RA_RNTI is determined by transmitting the timing of the PRACH Preamble by the UE.

That is, RA_RNTI may be determined by Equation 8 below.

In Equation 4, s_id represents the first OFDM symbol index (0≤s_id <14), t_id represents the first slot index in the system frame (0≤t_id <X), and X is fixed 80 for 120kHz SCS , F_id represents the frequency domain index (0≤f_id <Y), Y is a fixed 8 for the maximum #n of the FDM RO, and ul_carrier_id represents the indication of the UL carrier (0: normal, 1: SUL) .

The minimum gap between MSG2 and MSG3 is the duration of the N1 + duration of N2 + L2 + TA.

Here, N1, N2 are front loaded + additional DMRS and UE capability, L2 is MAC processing latency (500us), and TA is the same as the maximum timing advance value.

If MSG2 does not include a response to the transmitted preamble sequence,

After the duration of N1 + △ new + L2, a new preamble sequence is transmitted.

Table 13 shows an example of DCI format 1-0 with RA-RNTI.

Next, look at Message3.

MSG3 is scheduled by the uplink grant in RAR.

The MSG3 is transmitted after a minimum time interval from the end of MSG2.

The transmission power of MSG3 is set in MSG2.

The SCS for MSG3 is set in the RMSI containing 1 bit (independently from the SCS for MSG1).

MSG3 includes UE-Identity and establishment cause.

First, for UE-Identity, the IMSI is sent in the message when it first attaches to the network.

If the terminal was previously attached, the S-TMSI is included in the message.

And, the reasons for the establishment may include emergency, MO-signaling, MO-data, MT-access, high-priority access, and the like.

Table 14 below shows an example of DCI format 0-0 with TC-RNTI for MSG3 retransmission.

Let's take a look at MSG4 configuration.

MSG4 settings are limited within the UE minimum DL BW.

The SCS for MSG4 is identical to the numerology for RMSI and MSG2.

The minimum gap between the start of MSG4 and HARQ-ACK is N1 + L2.

Here, N1 is a UE processing time, and L2 is a MAC layer processing time.

Let's look at the distinction between MSG 3 retransmission order and MSG4.

MSG3 retransmission: DCI format 0-0 with TC-RNTI

MSG4: DCI format 1-0 with TC-RNTI

13 shows an example of MSG3 retransmission and MSG4 transmission.

Table 15 below shows an example of DCI format 1-0 having TC-RNTI for MSG4.

Hereinafter, the random access procedure of the NR system will be described in more detail.

The UE may transmit the PRACH preamble in UL as Msg1 of the random access procedure.

Two different length random access preamble sequences are supported. The long sequence length 839 is applied with subcarrier spacing of 1.25 and 5 kHz, and the short sequence length 139 is applied with subcarrier spacing 15, 30, 60 and 120 kHz. Long sequences support unrestricted sets and limited types of A and B sets, while short sequences support only unrestricted sets.

Multiple RACH preamble formats are defined by one or more RACH OFDM symbols and different cyclic prefix and guard time. The PRACH preamble configuration is provided to a terminal in system information.

When there is no response to Msg1, the UE may retransmit the PRACH preamble by power ramping within a predetermined number of times. The UE calculates PRACH transmission power for retransmission of the preamble based on the most recent estimated path loss and power ramping counter. When the terminal performs beam switching, the power ramping counter does not change.

The system information informs the UE of the association between SS blocks and RACH resources.

14 shows a concept of a threshold value of an SS block for RACH resource association.

Referring to FIG. 14, the threshold of the SS block for RACH resource association is based on RSRP and network configuration. The transmission or retransmission of the RACH preamble is based on an SS block that satisfies the threshold.

When the UE receives the random access response through the DL-SCH, the DL-SCH may provide timing alignment information, RA-preamble ID, initial UL approval and temporary C-RNTI. Based on the above information, the UE may perform UL transmission through UL-SCH as Msg3 of the random access procedure. Msg3 may include an RRC connection request and a UE identifier.

In response to the Msg3, the network may transmit Msg4, and Msg4 may be treated as a contention resolution message for DL. The terminal may enter the RRC connected state by receiving Msg4.

The detailed description of each step is as follows.

Before the physical random access procedure begins, Layer 1 must receive the SS / PBCH block index set from the upper layer and provide the RSRP measurement set corresponding to the upper layer.

Before the physical random access procedure starts, Layer 1 receives the following information from the upper layer.

-Configuration of physical random access channel (PRACH) transmission parameters (PRACH preamble format, time resource and frequency resource for PRACH transmission).

-PRACH preamble sequence set (logical root sequence table, cyclic shift () and set type (unrestricted, limit set A or limit set B) parameters for determining the root sequence and its cyclic shift).

From the physical layer point of view, the L1 random access procedure includes transmission of a random access response (RAR) message with a random access preamble (Msg1), PDCCH / PDSCH (Msg2) in the PRACH, PUSCH transmission of Msg3, PDSCH for contention resolution It may include.

When the random access procedure is initiated by "PDCCH order" for the terminal, the random access preamble transmission has the same subcarrier spacing as the random access preamble transmission initiated by the upper layer.

When the UE is composed of two uplink carriers for the serving cell and detects "PDCCH order", the UL / SUL indicator field value from the "PDCCH order" detected is used to determine the uplink carrier for the corresponding random access. do.

With respect to the random access preamble transmission step, the physical random access procedure is triggered according to the request of PRACH transmission by upper layers or PDCCH command. The configuration by the upper layer for PRACH transmission includes:

-Configuration for PRACH transmission.

-Preamble index, preamble subcarrier spacing, P _{PRACH, target} , corresponding RA-RNTI and PRACH resources.

The preamble is transmitted using the PRACH format selected as the transmission power P _{PRACH, b, f, c} (i) on the indicated PRACH resource.

The UE is provided with a number of SS / PBCH blocks associated with one PRACH case by the value of the upper layer parameter SSB-perRACH-Occasion. If the SSB-perRACH-Occasion value is less than 1, one SS / PBCH block is mapped in the case of 1 / SSB-rach-occasion continuous PRACH.

The UE is provided with a number of preambles per SS / PBCH block by the value of the upper layer parameter cb-preamblePerSSB, and the total number of preambles per SSB (per SSB) according to the PRACH occasion is the value of SSB-perRACH-Occasion and the value of cb-preamblePerSSB. It is decided by the multiple of.

The SS / PBCH block index is mapped in the PRACH case in the following order.

-First, the order of preamble indexes increases within a single PRACH event.

-Second, the order of frequency resource indexes for the frequency multiplexed PRACH case increases.

-Third, the increasing order of the time resource index for the time multiplexed PRACH case in the PRACH slot.

-Fourth, the order of increasing index for the PRACH slot.

For mapping the SS / PBCH block to the PRACH case, the period starting from frame 0 is the period starting from frame 0

It is the smallest period among the {1, 2, 4} PRACH construction periods that are greater than or equal. Here, the terminal is from the upper layer parameter SSB_transmitted-SIB1

Get

Is the number of SS / PBCH blocks that can be mapped to one PRACH configuration cycle.

If the random access procedure is initiated by the PDCCH command, the terminal (if requested by the upper layer) should transmit the PRACH in the first possible PRACH occassion. The first possible PRACH occassion is the time between the last symbol of PDCCH order reception and the first symbol of PRACH transmission.

This is the case greater than or equal to msec.

The

Time length of the symbol and in PUSCH processing capability 1

Is being preset

In case of, it corresponds to PUSCH preparation time.

In response to the PRACH transmission, the terminal attempts to detect the PDCCH with the corresponding RA-RNTI during the window controlled by the upper layer. This window is the terminal at least after the last symbol of the preamble sequence transmission

The symbol, Type1-PDCCH, starts at the first symbol of the earliest set of control resources configured for the common search space. The length of the window is provided by the higher layer parameter rar-WindowLength based on the number of slots based on the subcarrier space for the Type0-PDCCH common search space.

When the UE detects a PDCCH having a corresponding PDSCH including a DL-SCH transport block in a corresponding RA-RNTI and a corresponding window, the UE transmits the transport block to a higher layer.

The upper layer parses the transport block for a random access preamble identifier (RAPID) associated with PRACH transmission. When the upper layer identifies RAPID in the RAR message (s) of the DL-SCH transport block, the upper layer indicates uplink permission for the physical layer. This indication is referred to as a random access response (RAR) UL grant at the physical layer. If the upper layer does not identify the RAPID associated with the PRACH transmission, the upper layer may indicate to the physical layer to transmit the PRACH.

The minimum time between the last symbol of PDSCH reception and the first symbol of PRACH transmission is

Same as msec. here,

msec is an additional PDSCH DM-RS is configured

Corresponds to PDSCH reception time for PDSCH capability 1

The duration of the symbol.

The UE should receive the PDCCH having the RA-RNTI corresponding to the PDSCH including the DL-SCH transport block having the same DM-RS antenna port quasi co-location attribute for the detected SS / PBCH block or the received CSI-RS. do. When the UE attempts to detect a PDCCH having a corresponding RA-RNTI in response to the PRACH transmission initiated by the PDCCH command, the UE assumes that the PDCCH and PDCCH order have the same DM-RS antenna port quasi co-location attribute. .

The RAR UL grant from the terminal (Msg3 PUSCH) schedules PUSCH transmission. The contents of the RAR UL grant starting with MSB and ending with LSB are shown in Table 16 below. Table 16 below summarizes the field sizes of random access response grant contents.

The Msg3 PUSCH frequency resource allocation is for uplink resource allocation type 1. For frequency hopping, the first or second bit of the Msg3 PUSCH frequency resource allocation, based on the indication of the frequency hopping flag field

The bit field is used as a hopping information bit as described in Table 10 below.

The MCS is determined from the first 16 indexes of the corresponding MCS index table for PUSCH. TPC instruction

Is used to set the power of Msg3 PUSCH and TPC command for Msg3 PUSCH

It is interpreted according to Table 17 below.

In a non-contention based random access procedure, a CSI request field is interpreted to determine whether an aperiodic CSI report is included in a corresponding PUSCH transmission. In the contention-based random access procedure, the CSI request field is reserved.

The UE receives the subsequent PDSCH using the same subcarrier spacing as the PDSCH reception providing the RAR message, unless the subcarrier spacing is configured.

If the UE does not detect a PDCCH having a corresponding RA-RNTI and a corresponding DL-SCH transport block in a window, a procedure of receiving a random access response is performed.

For example, the terminal may perform power ramping for retransmission of the random access preamble based on the power ramping counter. However, as shown in FIG. 17, when the terminal performs beam switching in PRACH retransmission, the power ramping counter does not change.

Referring to FIG. 15, when the UE retransmits the random access preamble for the same beam, the power ramping counter may be increased by one. However, when the beam is changed, the power lamp counter does not change.

With regard to Msg3 PUSCH transmission, the upper layer parameter msg3-tp indicates to the UE whether to apply transform precoding for Msg3 PUSCH transmission. When the UE applies transform precoding to Msg3 PUSCH transmission with frequency hopping, the frequency offset for the second hop is given in Table 18 below. Table 18 shows the frequency offset for the second hop for Msg3 PUSCH transmission with frequency hopping.

The subcarrier interval for Msg3 PUSCH transmission is provided by the upper layer parameter msg3-scs. The UE must transmit PRACH and Msg3 PUSCH on the same uplink carrier of the same serving cell. UL BWP for Msg3 PUSCH transmission is indicated by SystemInformationBlockType1.

When the PDSCH and the PUSCH have the same subcarrier interval, the minimum time between the last symbol of the PDSCH reception carrying the RAR and the first symbol of the corresponding Msg3 PUSCH transmission scheduled by the RAR in the PDSCH for the UE is

Same as msec.

Corresponds to the PDSCH reception time for PDSCH processing capability 1 when an additional PDSCH DM-RS is configured

The duration of the symbol.

Corresponds to PUSCH preparation time for PUSCH processing capability 1

The duration of the symbol. And

Is the maximum timing adjustment value that can be provided by the TA command field within the RAR.

In response to the Msg3 PUSCH transmission indicating that the C-RNTI is not provided, the UE attempts to detect the PDCCH together with the TC-RNTI corresponding to scheduling the PDSCH including the UE contention resolution indentity. The UE transmits HARQ-ACK information in PUCCH in response to receiving the PDSCH having the UE contention resolution indentity. The minimum time between the last symbol of PDSCH reception and the first symbol of HARQ-ACK transmission is

Same as msec.

Corresponds to the PDSCH reception time for PDSCH processing capability 1 when an additional PDSCH DM-RS is configured.

The duration of the symbol.

Currently, in case of 4 layers or less, only one codeword (CW) can be supported. However, when considering a non-coherent joint transmission (NCJT) CoMP situation, it may have better performance to transmit different CWs at different transmission reception points (TPRs) or transmission points (TPs).

Since different TRP channels transmit data to different terminals, transmission parameters such as modulation and coding scheme (MCS) suitable for the situation of each channel may be different.

That is, because the channels for communication with the terminals of different TRP are different, the surrounding situation and the communication situation may vary according to the channel location, and accordingly, the parameters applied to each channel may be different because the performance is different.

For example, when a specific channel is low rank and low SNR, and other channels are high rank and high SNR, transmission parameters suitable for each TRP may be different. In this case, each transmission parameter may be set for each codeword. There is a need.

Therefore, when considering such a transmission environment, 2 CW transmission is required even for transmission of 4 layers or less. To support this, a method capable of transmitting 2 CWs under 4 layers is required.

At this time, the NCJT CoMp situation is as follows.

Non-coherent JT: The non-coherent JT scheme refers to a transmission scheme in which transmission of MIMO layer (s) is performed from two or more transmission points (TPs) without adaptive precoding through TP. At this time, TRP may have the same meaning as TRxP, TP, etc., and may have the following meaning.

Transmission Reception Point (TRxP): An array of antennas with one or more antenna elements available in a network at a specific geographic location in a specific region.

From a data transmission perspective, TRP can correspond to antenna ports. That is, the data generated by the base station can be transmitted to the terminal through TRP.

In addition to the problems described above, for more than 5 layers currently supporting 2 CW transmission, the number of layers corresponding to each CW is fixed. For example, in the case of 5 layer, 2 layer transmission in CW 0 and 3 layer transmission in CW 1 may be fixedly defined.

However, more various combinations of codewords and mapping methods between layers may be required to increase scheduling flexibility according to channel conditions of each TRP.

For example, in the case of 5 layer transmission, VW 0 to 1 layer transmission and CW 1 to 4 layer transmission may be defined in addition to the existing method, and a specific method of the two is individually controlled to the UE according to a channel state And the like.

In order to solve this problem, in the case of two or more layers, a method for securing scheduling flexibility is proposed by variously setting a method for transmitting 2 CWs and a mapping method between CWs and layers.

<Proposal 1>

When a plurality of (two or more) codewords are transmitted, if a plurality of mapping methods between codewords and layers are possible, the mapping methods between codewords and layers may be set to be distinguished by different operations according to the mapping method. .

Various combinations of mapping methods may be defined to increase scheduling flexibility according to the channel state of each TRP described above.

Table 19 below shows an example of defining a mode by distinguishing different combinations of CW-to-layer mapping methods according to different operations according to the difference between the total number of layers and the number of layers between CW 0 and CW 1 in the case of 2 CW transmission. Indicates.

The mode may be divided into mode 0, mode 1, mode 2, or mode 3 according to each mapping operation.

In Table 19, the vertical axis means the total number of transport layers, and the horizontal axis means the difference in the number of transport layers between CW 0 and CW 1. The ratio of X: Y in each column means the number of layers mapped to CW 0 and the number of layers mapped to CW 1, respectively.

Table 20 below shows an example of a method of mapping a complex-valued modulation symbol d generated from each CW for a case in which the total number of transport layers is 6 based on Table 19 to different layers.

In Table 20, d ^(c) (i) means the modulation symbol of the i-th complex value generated in the c-th CW, and x ^(v) (i) is the modulation symbol of the i-th complex value mapped to the v-th layer. Means Table 20 is an example corresponding to the case where the total number of transport layers is 6, and in a similar manner, 2, 3, ... For 8 layers, mapping methods such as codewords and layers corresponding to mode 1, mode 2, and mode 3 may be applied, respectively.

At this time, as shown in Table 20, each codeword may be individually layered, and the number of layers mapped between codewords may be the same or different depending on the mode as shown in Table 19.

That is, the channel conditions of the TRP through which the codeword is transmitted may be different, and the number of layers mapped to each codeword may be flexibly set according to modes in order to flexibly map the codeword to the layers.

Among the different codeword to layer mapping methods defined in Table 19 and Table 20, a specific method should be indicated for data transmission between the base station and the terminal. In this case, a specific method may be determined according to a predefined rule or exchange of signals between the terminal and the base station.

For example, the base station explicitly instructs the mapping relationship between the codeword and the layer to the terminal through higher layer signaling or downlink control information (DCI), or the mapping between the codeword and the layer in advance to the terminal. Relationships can be established.

Hereinafter, a method for instructing a mapping relationship between a codeword and a layer by a base station to a terminal will be described.

<Proposal 2>

The base station may indicate the mapping relationship between the codeword and the layer through the DCI to the terminal.

Specifically, when defining each state of the field set for the DMRS pod indicator of DCI, the base station defines a specific mapping method among mapping methods between codewords and layers defined by one or more methods for each DMRS port combination. can do.

The base station may use a specific field (first mapping information) to indicate a mapping relationship between a codeword and a layer to the terminal, and when a specific DMRS pod combination is instructed to the terminal through a specific field, mapped to the corresponding DMRS port combination A mapping method between codewords and layers can be used.

DCI may include a field indicating the mapping relationship between the codeword and the layer (first mapping information), as well as a field indicating the mapping relationship between the layer and the DMRS port (second mapping information), and the first mapping information and the second The mapping information may be jointly encoded and included in a specific field of DCI.

The relationship between CW, layer, DMRS port, and DMRS sequence is as follows.

The set of data bits to be transmitted by the base station to the terminal can be defined as CW, and up to two CWs can be defined. Bits constituting each CW may be modulated into symbols according to a specific modulation scheme, and modulation symbols modulated from CW bits may be mapped to different layers according to specific rules.

Modulation symbols mapped to each layer are mapped to different DMRS ports according to a specific rule, and each DMRS port is mapped to specific resource elements so that modulation symbols can be mapped to corresponding resource elements.

Through this process, a modulation symbol generated with CW bits can be mapped to specific resource elements of a specific DMRS port. Modulation symbols generated with CW bits may be distorted by a channel between a transmitting DMRS port and a receiving antenna port.

In order to compensate for this distortion and demodulate the original modulation symbol to decode data bits, a signal known to each other by a transmitter and a receiver is transmitted through the same DMRS port. The corresponding signal known by the transmitting and receiving terminal may be referred to as a DMRS sequence.

The DMRS sequence is transmitted to the same DMRS port as the modulation symbols generated from CW bits, and the modulation symbol can be transmitted through a resource element that is not transmitted. In the present invention, in the series of processes described above, modulation symbols modulated from CW bits are mapped to different layers according to specific rules, and rules for mapping modulation symbols mapped to each layer to specific DMRS ports are defined. do.

As suggested in Proposal 1, even if the total number of transport layers is the same, the number of layers diverged from the two CWs may be set differently to improve scheduling flexibility when channel conditions from different TRPs are different in a transport method such as NCJT CoMP.

Each layer mapped to each CW through the proposed method of Proposal 1 should be mapped to a specific DMRS port. In this case, even in the case of the same DMRS port combination, the mapping method between the codeword and the layer may be different. The channel estimation performance varies depending on which DMRS port combination is mapped according to the mapping method between the codeword and the layer, and consequently the system performance. It can affect.

That is, the performance of channel estimation may vary according to whether DMRS pods are mapped to a layer mapped to the same codeword or characteristics of the mapped DMRS ports, thereby improving or reducing system performance.

For example, when setting the value 0 of a part corresponding to two codeword transmissions in Table 7, to the terminal, the combination of DMRS ports set for the terminal is 1000, 1001, 1002, 1003, 1004.

In this case, when divided into ports multiplexed by code division multiplexing (CDM) in the time / frequency domain, a group (CDM group 0) having a port index (1000, 1001, 1004) and a group having a port index (1002, 1003) (CDM group 1).

The CDM (Code division multiplexing) group means a set of DMRS ports multiplexed through the CDM method in the time / frequency domain. At this time, since the total number of transport layers is 5, one of a mapping method between a codeword and a layer corresponding to mode 0 or mode 1 may be applied.

When applying Mode 0, DMRS ports of different CDM groups can be mapped to different CW layers. For example, ports 1000, 1001, and 1004 of CDM group 0 are mapped to layer 2, layer 3, and layer 4 branched from CW 1, respectively, and ports 1002, 1003 of CDM group 1 are layer 0, branched from CW0, respectively. It can be mapped to layer 1.

On the other hand, when mode 1 is applied, DMRS ports of different CDM groups cannot be mapped to different CW layers. For example, ports 1000, 1001, and 1004 of CDM group 0 are mapped to layer 2, layer 3, and layer 4 branched from CW1, and ports 1002 and 1003 of CDM group 1 are from layer 0 and CW1 branched from CW0, respectively. It can be mapped to branched layer 1.

When the method of applying the mode 0 is the method 1 and the method of applying the mode 1 is the method 2, the improved channel estimation performance may have the method 1 having better performance than the method 2.

That is, in the same situation as NCJT CoMP, CW0 and CW1 can be used for data transmission from different TRP 0 and TRP 1, respectively. In this case, the transmission parameters of CW0 and CW1 in different channel environments may differ. In this situation, in the case of method 1, layers branched from different CWs may be mapped to DMRS ports included in different CDM groups.

Therefore, when separating the DMRS ports multiplexed with CDM, it may be expected that the performance of the ports will not be degraded because the channel condition of each port will be similar.

On the other hand, in the case of method 2, layers branched from different CWs may be mapped to the DMRS port of the same CDM group. For example, DMRS ports 1002 and 1003 are mapped to layer 0 branched from CW0 and layer 1 branched from CW1, respectively.

In this case, data is transmitted to two DMRS ports multiplexed in the frequency domain CDM in a situation where the channel environment in which CW0 and CW1 are to be transmitted is expected to be different. If the channel environment experienced by the port 1002 and port 1003 is significantly different, when separating two ports multiplexed by CDM, channel estimation may deteriorate with the other channel environment, resulting in deterioration of system performance such as throughput. have.

That is, when mapping layers mapped to different CWs to DMRS ports multiplexed through the CDM method in the time / frequency domain, transmission parameters that do not consider channel characteristics may be applied. Accordingly, deterioration may occur in channel estimation performance, which may degrade system performance such as throughput.

In order to prevent this, and according to the DMRS port combination set for the terminal, the DMRS ports multiplexed through the CDM method in the time / frequency domain may be configured with a mapping method between codewords and layers that map to layers branched from the same CW.

Specifically, when defining each state of a field set for a DMRS port indicator in DCI, after mapping a specific codeword-to-layer mapping method for each DMRS port combination, the terminal may be indicated together.

That is, a combination of DMRS ports (second mapping information) and a codeword-to-layer mapping method may be encoded together and indicated as one DCI field value.

Tables 21 to 24 below show an example in which a combination of a codeword-to-layer mapping method and a port of DMRS is encoded in a specific field of DCI.

Tables 21 to 24 show an example of extending the codeword-to-layer mapping method according to Proposal 2 to Tables 6 to 9.

In the examples of Tables 21 to 24, the DMRS port combination and the codeword-to-layer mapping method are encoded together and can be set through DCI as one DCI field for the UE.

In a similar way, if the codeword-to-layer mapping method is encoded with the DMRS port combination and is not explicitly indicated to the UE through a specific DCI field, the specific codeword-to-layer mapping method is combined with the specific DMRS port combination. The mapping relationship of may be defined as a rule previously promised between the base station and the terminal.

For example, when 10 is indicated to the terminal as the value of the two codeword transmissions in Table 24, it can be set in advance between the terminal and the base station that the codeword-to-layer mapping method corresponding to mode 2 is applied. When receiving this, the terminal may map the codeword and the layer by applying a codeword-to-layer mapping method corresponding to mode 2.

In addition, the layer can be mapped to the DMRS port through a mapping method between the layer and the DMRS pod.

The mapping order between each DMRS port and layer in Tables 21 to 24 may be set according to specific rules. That is, the order of the port indexes disclosed in the columns indicated by “DMRS ports” in Tables 21 to 24 may be the same as the order in which each layer is mapped.

For example, in the case of two codeword transmissions in Table 22, when the value of 7 is indicated to the terminal through DCI, the DMRS ports set to the terminal are equal to 1000, 1001, 1004, 1005, 1002, and 1003, respectively Ports are mapped to layer 2, layer 3, layer 4, layer 5, layer 0 and layer 1.

At this time, it is also possible to map in the order of layer 0, layer 1, layer 2, layer 3, layer 4, layer 5, not the above order. However, since this mapping order is not an intended order, in order to remove ambiguity between the base station and the terminal, the terminal is included in DCI together with information on the sequence of CW to map the DMRS port index as in the example of Tables 21 to 24. Can instruct.

That is, as in the examples of Tables 21 to 24, the base station may inform the UE through DCI that the order of CW corresponding to the DMRS port index is CW1 CW0 in each codeword-to-layer mapping method.

Alternatively, a fixed rule may be set between the base station and the terminal rather than directly including the corresponding content in the table as in the examples of Tables 21 to 24. That is, the rules for the mapping order between the DMRS pod and the layer between the terminal and the base station can be set in advance, and when the terminal receives the DCI, it can recognize that the DMRS ports and layers are mapped according to the preset rules.

According to another embodiment of the present invention, when two codewords are transmitted in Tables 21 to 24, DMRS ports mapped to layers mapped to a specific codeword are included in each CDM group when two or more CDM groups are included. Layers and DMRS ports may be mapped so that the number of DMRS ports included is as uniform as possible.

For example, when two codewords are transmitted as shown in Table 24, when the value 16 is indicated through DCI, the DMRS ports set in the terminal are equal to 1000, 1001, 1004, 1005, 1006, 1010, 1002, 1003 , 1000, 1001, 1004, 1005, 1006, and 1010 ports can be mapped to layer 2, layer 3, layer 4, layer 5, layer 6, and layer 7 mapped to CW 1, respectively.

In this case, 1000, 1001, and 1006 may correspond to CDM group 0, and 1004, 1005, and 1010 may correspond to CDM group 2. That is, DMRS ports to which layers branched from the same CW are mapped may be mapped to DMRS ports included in two CDM groups. In this case, the number of DMRS ports included in each CDM group may be mapped to be the same for each CDM group as much as possible.

Alternatively, in contrast to the above embodiment, the existing antenna ports 1000, 1001, 1004, 1005, 1006, and 1010 may be replaced with antenna ports 1000, 1001, 1004, 1005, 1006, and 1007.

In this example, DMRS ports 1000, 1001, 1006, and 1007 correspond to CDM group 0, and DMRS ports 1004 and 1005 correspond to CDM group 2.

That is, more DMRS ports of a specific CDM group may be mapped to a layer mapped to a specific codeword. The reason that the number of DMRS ports included in the CDM group is mapped to be as uniform as possible is that the channel multiplexed by frequency division multiplexing (FDM) / time division multiplexing (TDM) when separating the multiplexed ports through the CDM method This is because the deterioration of the estimated performance may be greater.

This is because interference does not occur between different DMRS ports in a multiplexing scheme such as FDM / TDM, but interference may occur in a process of separating multiplexed DMRS ports according to channel conditions in the CDM scheme. This is due to the characteristics of the CDM method, which assumes that channels for resources to be CDM are the same.

The group of ports multiplexed through the CDM method in the time / frequency domain was referred to as a CDM group. For example, in the case of DMRS configuration type 1, DMRS ports 1000, 1001, 1004, and 1005 are referred to as CDM group 0, and DMRS ports 1002, 1003, 1006, and 1007 are referred to as CDM group 1.

In addition to the above proposals 1 and 2, the following methods may be applied to improve scheduling flexibility.

DMRS ports multiplexed by the CDM method of the time domain in the same CDM group can be mapped to layers mapped to different CWs. When this method is applied, in the DMRS configuration type 1, a combination of the number of layers diverged from CW0 and CW1 for the same total number of transport layers may be set in more various ways.

In addition, in the case of DMRS configuration type 2, RS overhead due to transmission of RS can be reduced because it is not necessary to use all three CDM groups of antenna ports.

In this method, if there is a DMRS port multiplexed with CDM in the time domain, the number of front-load DMRSs for demodulation may be set to 2. In this case, due to the low mobility of the terminal, additional DMRS may be set in up to two symbols. When the number of front-load DMRSs is set to 2, it is to support a situation in which the number of transmission ports is large, and in this case, it may be assumed that the mobility of the terminal is low.

This is because if the mobility of the terminal is large, a difference may occur in the CSI (Channel state information) that the terminal feeds back to the base station and the actual CSI at the time when the base station schedules data to the terminal.

The front-load DMRS means a DMRS consisting of one symbol or two symbols located in the frontmost symbol in a data area scheduled for a terminal for use in channel estimation for data demodulation.

Additional DMRS means DMRS transmitted after front-load DMRS for estimation of time-varying channels. That is, when the DMRS port is multiplexed with the CDM in the time domain, the number of front-load DMRSs is set to 2, and in this situation, it is expected that the time-varying effect of the channel between the base station and the terminal will be small because the mobility of the terminal is considered. have.

This is equivalent to a small deterioration in channel estimation performance when separating two DMRS ports multiplexed with a CDM in a time domain. In this case, even when DMRS ports are mapped to different layers, when the transmission parameters applied are similar due to differences in characteristics between channels, the difference in performance between channels may not be significant.

Accordingly, in this case, it is possible to map DMRS ports multiplexed through the CDM method of the time domain in the same CDM group to layers mapped to different CWs, respectively. When using this method, codeword-to-layer mapping can be set in various combinations, thereby improving scheduling flexibility.

Tables 25 and 26 below show an example of mapping antenna ports included in the same CDM group to layers mapped to different CWs.

The values 8, 10, 11 13, and 11, 15, 16, and 21 in Table 25 indicate that antenna ports included in the same CDM group are mapped to layers mapped to different CWs in this embodiment. Shows.

16 is a flowchart illustrating an example of a codeword transmission method of a base station to which the method proposed in this specification can be applied.

Referring to FIG. 16, a base station may instruct a UE through a DCI of a specific mapping method among codeword-to-layer mapping methods set in one or more ways according to a DMRS port combination.

Specifically, the base station may transmit information bits to the terminal. At this time, a codeword composed of information bits may be transmitted to the terminal. At least one codeword may be transmitted to the terminal.

In order to transmit the codeword to the terminal, the base station transmits DCI, which is downlink control information including scheduling information for information bits of the codeword, to the terminal (S16010).

The DCI may include first mapping information related to mapping between a codeword and a layer for receiving information bits of a codeword and second mapping information related to mapping between a layer and an antenna port to which a codeword is mapped.

The first mapping information and the second mapping information may be set as proposal 1 and proposal above, and may be encoded together and included in DCI. For example, in Tables 20 to 26, a specific value may be included in the DCI, and the terminal receiving this may recognize a mapping between a codeword and a layer and a mapping relationship between a layer and an antenna port.

Thereafter, the base station generates information bits of each codeword according to the number of DCI-included codewords and a modulation and coding scheme, and modulates the generated information bits into modulation symbols (S16020).

Modulation symbols in which information bits are modulated may be mapped to at least one specific layer according to a mode according to the first mapping information. At this time, when there are a plurality of codewords, each codeword may have the same or different number of layers mapped.

At least one specific layer to which the codeword is mapped may be mapped to at least one DMRS port according to the second mapping information that is a mapping rule set between the base station and the terminal (S16040).

As an example of a mapping rule according to the second mapping information, as described in proposal 2, at least one DMRS port may be mapped to each layer in the order of the port index disclosed in the “DMRS port (s)” column of Tables 20 to 25. .

In addition, when at least one DMRS ports are multiplexed on the time / frequency axis by the CDM method, DMRS ports multiplexed by the same CDM method can be grouped into a CDM group, and each layer mapped with the same codeword is the same group or DMRS ports included in different groups may be mapped.

Thereafter, a modulation symbol of the DMRS port may be mapped to a specific resource element according to the mapping relationship between the DMRS port and resource elements included in DCI (S16050).

The base station generates a DMRS sequence corresponding to each DMRS port according to the DMRS port information included in the DCI to compensate for distortion between channels before transmitting the codeword, and is defined for transmission of the DMRS sequence for each DMRS port The corresponding DMRS sequence may be mapped as a resource element (S16060).

The modulation symbol and DMRS sequence of each codeword mapped to each resource element may be converted into a signal in the time domain, and the converted signal may be transmitted to the terminal through each DMRS port (S16070).

17 is a flowchart illustrating an example of a method for receiving a codeword of a terminal to which the method proposed in this specification can be applied.

Referring to FIG. 17, the UE may receive a specific mapping method through a DCI among codeword-to-layer mapping methods set in one or more ways according to a DMRS port combination, and a codeword from a base station using the received DCI You can receive and demodulate.

Specifically, the terminal may receive the DCI including the scheduling information for the data signal of the codeword transmitted from the base station to obtain scheduling information for receiving the data signal (S17010).

The DCI may include first mapping information related to mapping between a codeword and a layer for receiving information bits of a codeword and second mapping information related to mapping between a layer and an antenna port to which a codeword is mapped.

The first mapping information and the second mapping information may be set as proposal 1 and proposal above, and may be encoded together and included in DCI. For example, in Tables 20 to 26, a specific value may be included in the DCI, and the terminal receiving this may recognize a mapping between a codeword and a layer and a mapping relationship between a layer and an antenna port.

The UE may receive a data signal transmitted from a base station in a resource region in which the data signal is transmitted based on DCI (S17020). The terminal converts the received time domain signal into a frequency domain signal, and maps a modulation symbol and a DMRS sequence as a resource element (S17030).

The terminal calculates (or estimates) the distortion caused by the channel using a DMRS sequence that is set in advance and knows the value before the channel is distorted, and uses this to obtain a valid channel value between the DMRS port and the receiving antenna port of the terminal. It can be estimated (S17040).

Using the estimated effective channel value, the UE compensates for distortion caused by a channel of a modulation symbol modulated from information bits of a codeword transmitted from the base station (S17050). The modulation symbol compensated for by the channel may be mapped to a specific layer based on mapping information (second mapping information) between the DMRS port and the transport layer included in the DCI (S17060).

At this time, the DMRS port may be mapped to the layer according to the order of the port index disclosed in “DMRS port (s)” as described in Tables 20 to 25. A modulation symbol mapped to a layer is mapped to a specific codeword based on mapping information (first mapping information) between a transport layer and a codeword included in DCI (S17070).

The UE may map the modulation symbol mapped to the layer to a specific codeword according to the mode indicated by the first mapping information, and the modulation symbol mapped to the codeword is demodulated into data bits and channels such as MCS included in DCI. It can be decoded based on the information and demodulated into information bits (S17080).

18 is a flowchart illustrating an example of a codeword transmission method of a base station in an initial access process to which the method proposed in this specification can be applied.

Referring to FIG. 18, in an initial access process, a base station may map a codeword to a layer using a specific mapping method among codeword-to-layer mapping methods set in one or more ways according to a combination of DMRS ports.

Specifically, the base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) to support the short-term initial access process (S18010).

In order to transmit the additional information required in the initial access procedure to the UE, the base station sets a resource region to which DCI indicating scheduling information for transmission of additional information is transmitted through the PBCH, and transmits DCI to the UE in the set resource region ( S18020).

The DCI may include first mapping information related to mapping between a codeword and a layer for receiving information bits of a codeword and second mapping information related to mapping between a layer and an antenna port to which a codeword is mapped.

The first mapping information and the second mapping information may be set as proposal 1 and proposal above, and may be encoded together and included in DCI. For example, in Tables 20 to 26, a specific value may be included in the DCI, and the terminal receiving this may recognize a mapping between a codeword and a layer and a mapping relationship between a layer and an antenna port.

Hereinafter, steps S18030 to S18080 are the same as steps S16020 to S16070 of FIG. 16, and description thereof will be omitted.

19 is a flowchart illustrating an example of a method for receiving a codeword of a terminal in an initial access process to which the method proposed in this specification can be applied.

Referring to FIG. 19, the terminal may receive a data signal in an initial access procedure, and may restore the received data signal to information bits.

Specifically, the terminal may receive the PSS, SSS and PBCH from the base station to perform the initial access procedure (S19010). The UE decodes the data bits transmitted through the received PBCH (S19020) and, based on the decoded information bits, sets a resource region set for transmission of DCI indicating scheduling information for additional information transmission necessary for an initial access process. Resource region information for the user may be obtained (S19030).

Thereafter, the terminal may receive the DCI in the set resource region, and may acquire scheduling information based on the received DCI (S19040). According to the DCI, the base station transmits a data signal to the terminal, and the terminal can receive the data signal transmitted by the base station in the resource region for data transmission allocated by the DCI (S19050).

Hereinafter, steps S19060 to S19110 are the same as steps S17030 to S17080 of FIG. 17, so description thereof will be omitted.

20 is a flowchart illustrating an example of a method of transmitting a codeword of a base station in a handover process to which the method proposed in this specification can be applied.

Referring to FIG. 20, in a handover procedure, a base station may map a codeword to a layer using a specific mapping method among codeword-to-layer mapping methods set in one or more ways according to a combination of DMRS ports.

Specifically, the base station receives measurement report information (measurementreport information) including parameter values of the base station measuring the adjacent base station for handover from the terminal (S20010).

The base station performs a handover preparation procedure with the target base station to which the terminal intends to perform handover (S20020). The base station performing the preliminary procedure for handover with the target base station transmits a DCI including scheduling information for transmission of RRC connection configuration information (for example, RRCConnectionReconfiguration information) including information for handover to the terminal to the terminal. (S20030).

The DCI may include scheduling information for transmitting information bits to the terminal, and the first mapping information and codeword mapping layer and antenna related to the mapping between the codeword and the layer for the terminal to receive the information bits of the codeword. It may include second mapping information related to mapping between ports.

The first mapping information and the second mapping information may be set as proposal 1 and proposal above, and may be encoded together and included in DCI. For example, in Tables 20 to 26, a specific value may be included in the DCI, and the terminal receiving this may recognize a mapping between a codeword and a layer and a mapping relationship between a layer and an antenna port.

Hereinafter, steps S20040 to S20090 are the same as steps S16020 to S16070 of FIG. 16, and description thereof will be omitted.

21 is a flowchart illustrating an example of a method for receiving a codeword of a terminal in a handover process to which the method proposed in this specification can be applied.

Referring to FIG. 21, after the handover procedure is performed, the terminal may receive a data signal and restore the received data signal into information bits.

Specifically, the terminal measures parameters for adjacent base stations for handover and transmits the measured parameters to the base station by including the measurement report information (S21020). Thereafter, the terminal receives DCI including scheduling information for RRC connection configuration information in order to receive RRC connection configuration information including information for handover (S21030).

The DCI may include scheduling information for transmitting information bits to the terminal, and the first mapping information and codeword mapping layer and antenna related to the mapping between the codeword and the layer for the terminal to receive the information bits of the codeword. It may include second mapping information related to mapping between ports.

The first mapping information and the second mapping information may be set as proposal 1 and proposal above, and may be encoded together and included in DCI. For example, in Tables 20 to 26, a specific value may be included in the DCI, and the terminal receiving this may recognize a mapping between a codeword and a layer and a mapping relationship between a layer and an antenna port.

Hereinafter, steps S21040 to S21090 are the same as steps S17030 to S17080 of FIG. 17, so a description thereof will be omitted.

22 is a flowchart illustrating an example of a data transmission method of a base station to which the method proposed in this specification can be applied. 22 is for convenience of description only and does not limit the scope of the present specification. The method and / or procedure described in FIG. 22 may be implemented by various devices as described in FIGS. 25 to 29 described later.

Referring to FIG. 22, a base station may map a plurality of layers to each codeword for two or more codewords, and map each layer to a plurality of DMRS ports and transmit it to a terminal.

Specifically, the base station (eg, 2210 or 2220 in FIG. 25) may set at least one codeword for transmitting information bits to the terminal (eg, 2210 or 2220 in FIG. 25), and a layer for each codeword The mapping of can be set in advance.

For example, when each codeword is transmitted through a different transmission point (for example, TRP or TP) as in proposal 1 described above, the base station has a characteristic of each channel because each transmitted channel is different. For example, transmission parameters to be applied according to SNR, rank, etc.) may be different.

Accordingly, the base station can map different layers to each codeword in order to apply different transmission parameters according to channel characteristics from each transmission point.

At this time, different code layers may be mapped to each codeword as described in Tables 20 to 25.

Thereafter, the base station may map a plurality of DMRS ports for transmission for each codeword mapped layer, and each layer may have a different number of DMRS ports mapped as described in proposal 1.

A plurality of DMRS ports can be grouped into DMRS port groups according to a CDM method in the time / frequency domain, and layers mapped to the same codeword are the same port group or as described in proposals 1 and 2 and Tables 20 to 26 DMRS ports included in different DMRS port groups may be mapped.

In addition, each layer may be mapped to the DMRS port in a set order (ie, the order listed in Table 20 to Table 25).

Thereafter, the base station may transmit the DCI to indicate the mapping relationship between the codeword and the layer and the mapping relationship between each layer and the DMRS port to the UE (S22010).

For example, the operation in which the base station in step S22010 described above transmits the DCI to the terminal may be implemented by the apparatuses of FIGS. 25 to 29 to be described below. For example, referring to FIG. 25, one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to transmit the DCI, and one or more transceivers 106 may transmit DCI to the terminal. .

DCI may include mapping information (first mapping information) between layers for each codeword and mapping information (second mapping information) between each layer and a DMRS port according to Tables 20 to 26, and the first mapping information. And the second mapping information may be encoded together and included in DCI.

Thereafter, the base station may transmit a plurality of codewords and dmrs sequences to the terminal through the mapped dmrs port based on DCI (S22020).

For example, the operation in which the base station in step S22020 described above transmits a plurality of codewords and dmrs sequences to the terminal may be implemented by the apparatuses of FIGS. 25 to 29 to be described below. For example, referring to FIG. 25, one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to transmit the plurality of codewords and dmrs sequences, and one or more transceivers 106 are terminals A plurality of codewords and dmrs may be transmitted through the dmrs port mapped to.

The UE can recognize the mapping relationship between the codeword and the layer and the mapping relationship between the layer and the dmrs port based on the first mapping information and the second mapping information included in the DCI, and the dmrs sequence and code from the base station according to the recognized mapping relationship. Words can be received.

For example, the terminal may receive one of the values shown in Tables 20 to 26 through the DCI from the base station, and recognize the operation mode of the base station based on the transmitted value.

Subsequently, based on the recognized mode, a layer and a dmrs port through which each codeword is transmitted can be recognized, and data can be received by receiving and demodulating the dmrs sequence and a codeword based on this.

Even when a plurality of codewords are transmitted through different TRPs using this method, since the layers can be flexibly mapped, scheduling flexibility can be secured.

23 is a flowchart illustrating an example of a method for receiving data by a terminal to which the method proposed in this specification can be applied. 23 is for convenience of description only and does not limit the scope of the present specification. The method and / or procedure described in FIG. 23 may be implemented by various devices as described in FIGS. 25 to 29 described later.

Referring to FIG. 23, the UE may recognize mapping information between a plurality of codewords and layers through DCI transmitted from a base station, and may receive data based on the recognized information.

Specifically, the terminal (eg, 25010 or 25020 in FIG. 25) may receive DCI from the base station (S23010). For example, the operation in which the terminal of step S23010 described above receives the DCI from the base station may be implemented by the apparatuses of FIGS. 25 to 29 to be described below. For example, referring to FIG. 25, the one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive the DCI, and the one or more transceivers 106 may receive DCI from the base station. have.

DCI may include mapping information (first mapping information) between layers for each codeword and mapping information (second mapping information) between each layer and a DMRS port according to Tables 20 to 25, and the first mapping information. And the second mapping information may be encoded together and included in DCI.

The layer mapping for each codeword and the mapping of the dmrs port for each layer can be set in advance.

For example, when each codeword is transmitted through different transmission points (for example, TRP or TP) as in proposal 1 described above, the characteristics of each channel are different because each transmitted channel is different. For example, transmission parameters to be applied to transmission of a codeword may be different according to SNR, rank, etc.).

Accordingly, each codeword may be mapped to a different layer in order to apply different transmission parameters to each channel according to channel characteristics from each transmission point.

At this time, different code layers may be mapped to each codeword as described in Tables 20 to 26.

Thereafter, each codeword mapped layer may be mapped to a plurality of DMRS ports for transmission, and each layer may have a different number of DMRS ports mapped as described in proposal 1.

A plurality of DMRS ports can be grouped into DMRS port groups according to a CDM method in the time / frequency domain, and layers mapped to the same codeword are the same port group or as described in proposals 1 and 2 and Tables 20 to 26 DMRS ports included in different DMRS port groups may be mapped.

In addition, each layer may be mapped to the DMRS port in a set order (ie, the order listed in Table 20 to Table 25).

Thereafter, the terminal may receive a plurality of codewords and dmrs sequences through the dmrs port mapped based on DCI from the base station (S23020).

For example, the operation in which the terminal of step S23020 described above receives a plurality of codewords and dmrs sequences from the base station may be implemented by the apparatuses of FIGS. 25 to 29 to be described below. For example, referring to FIG. 25, one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive the plurality of codewords and dmrs sequences, and one or more transceivers 106 are mapped A plurality of codewords and dmrs sequences can be received through the dmrs port.

Specifically, the terminal can recognize the mapping relationship between the codeword and the layer and the mapping between the layer and the dmrs port based on the first mapping information and the second mapping information included in the DCI, and the dmrs from the base station according to the recognized mapping relationship. It can receive sequence and codeword.

For example, the terminal may receive one of the values shown in Tables 20 to 25 through the DCI from the base station, and recognize the operation mode of the base station based on the transmitted value.

Subsequently, based on the recognized mode, a layer and a dmrs port through which each codeword is transmitted can be recognized, and data can be received by receiving and demodulating the dmrs sequence and a codeword based on this.

Even when a plurality of codewords are transmitted through different TRPs using this method, since the layers can be flexibly mapped, scheduling flexibility can be secured.

24 illustrates a communication system 2400 applied to the present invention.

Referring to FIG. 24, a communication system 2400 applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited to this, wireless devices include robots 2410a, vehicles 2410b-1, 2410b-2, XR (eXtended Reality) devices 2410c, hand-held devices 2410d, and home appliances 2410e. ), Internet of Thing (IoT) device 2410f, and AI device / server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.). Household appliances may include a TV, a refrigerator, and a washing machine. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may also be implemented as wireless devices, and the specific wireless device 2410a may operate as a base station / network node to other wireless devices.

The wireless devices 2410a to 2410f may be connected to the network 300 through the base station 2420. AI (Artificial Intelligence) technology may be applied to the wireless devices 2410a to 2410f, and the wireless devices 2410a to 2410f may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 2410a to 2410f may communicate with each other through the base station 2420 / network 300, but may directly communicate (e.g. sidelink communication) without going through the base station / network. For example, the vehicles 2410b-1 and 2410b-2 may communicate directly (e.g. Vehicle to Vehicle (V2V) / Vehicle to everything (V2X) communication). Further, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensor) or other wireless devices 2410a to 2410f.

Wireless communication / connections 150a, 150b, and 150c may be achieved between the wireless devices 2410a to 2410f / base station 2420, base station 2420 / base station 2420. Here, the wireless communication / connection is various wireless access such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, IAB (Integrated Access Backhaul)). It can be achieved through technology (eg, 5G NR), and wireless devices / base stations / wireless devices, base stations and base stations can transmit / receive radio signals to each other through wireless communication / connections 150a, 150b, 150c. For example, the wireless communication / connections 150a, 150b, 150c can transmit / receive signals through various physical channels.To this end, based on various proposals of the present invention, for the transmission / reception of wireless signals, At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, and the like may be performed.

Example wireless device to which the present invention is applied

25 illustrates a wireless device that can be applied to the present invention.

Referring to FIG. 25, the first wireless device 2510 and the second wireless device 2520 may transmit and receive wireless signals through various wireless access technologies (eg, LTE, NR). Here, {the first wireless device 2510, the second wireless device 2520} is {wireless device 2410x, base station 2420} and / or {wireless device 2410x), wireless device 2410x in FIG. }.

The first wireless device 2510 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate the first information / signal, and then transmit the wireless signal including the first information / signal through the transceiver 106. Also, the processor 102 may receive the wireless signal including the second information / signal through the transceiver 106 and store the information obtained from the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 is an instruction to perform some or all of the processes controlled by the processor 102, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 can be coupled to the processor 102 and can transmit and / or receive wireless signals through one or more antennas 108. The transceiver 106 may include a transmitter and / or receiver. The transceiver 106 may be mixed with a radio frequency (RF) unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

The second wireless device 2520 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. Processor 202 controls memory 204 and / or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal through the transceiver 206. Further, the processor 202 may receive the wireless signal including the fourth information / signal through the transceiver 206 and store the information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 is an instruction to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 can be coupled to the processor 202 and can transmit and / or receive wireless signals through one or more antennas 208. Transceiver 206 may include a transmitter and / or receiver. Transceiver 206 may be mixed with an RF unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

Hereinafter, the hardware elements of the wireless devices 2510 and 2520 will be described in more detail. Without being limited to this, one or more protocol layers may be implemented by one or more processors 102 and 202. For example, one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102 and 202 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created. The one or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. The one or more processors 102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or more transceivers 106, 206. One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein PDUs, SDUs, messages, control information, data or information may be obtained according to the fields.

One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or more processors 102, 202. Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in one or more processors 102, 202, or stored in one or more memories 104, 204. It can be driven by the above processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, instructions and / or instructions.

One or more memories 104, 204 may be coupled to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions, and / or instructions. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium and / or combinations thereof. The one or more memories 104, 204 may be located inside and / or outside of the one or more processors 102, 202. Also, the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as a wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, radio signals / channels, and the like referred to in the methods and / or operational flowcharts of the present document to one or more other devices. The one or more transceivers 106, 206 may receive user data, control information, radio signals / channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. have. For example, one or more transceivers 106, 206 may be coupled to one or more processors 102, 202, and may transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Additionally, the one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and one or more transceivers 106, 206 may be described, functions described herein through one or more antennas 108, 208. , May be set to transmit and receive user data, control information, radio signals / channels, and the like referred to in procedures, proposals, methods, and / or operational flowcharts. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or more transceivers 106 and 206 process the received user data, control information, radio signals / channels, etc. using one or more processors 102, 202, and receive radio signals / channels from the RF band signal. It can be converted to a baseband signal. The one or more transceivers 106 and 206 may convert user data, control information, and radio signals / channels processed using one or more processors 102 and 202 from a baseband signal to an RF band signal. To this end, the one or more transceivers 106, 206 may include (analog) oscillators and / or filters.

Wireless device application example to which the present invention is applied

26 shows another example of a wireless device applied to the present invention. The wireless device may be implemented in various forms according to use-example / service (see FIG. 25).

Referring to FIG. 26, the wireless devices 2510 and 2520 correspond to the wireless devices 2510 and 2520 of FIG. 25, and various elements, components, units / units, and / or modules (module). For example, the wireless devices 2510 and 2520 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and a transceiver (s) 114. For example, the communication circuit 112 can include one or more processors 102,202 and / or one or more memories 104,204 of FIG. For example, the transceiver (s) 114 may include one or more transceivers 106,206 and / or one or more antennas 108,208 of FIG. 25. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 110, or externally (eg, through the communication unit 110) Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 24, 2410a), vehicles (FIGS. 24, 2410b-1, 4210b-2), XR devices (FIGS. 24, 2410c), portable devices (FIGS. 24, 2410d), and household appliances. (FIG. 24, 2410e), IoT device (FIG. 24, 2410f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environment device, It may be implemented in the form of an AI server / device (FIG. 24, 400), a base station (FIG. 24, 2420), a network node, or the like. The wireless device may be movable or used in a fixed place depending on the use-example / service.

In FIG. 26, various elements, components, units / parts, and / or modules in the wireless devices 2510 and 2520 may be entirely interconnected through a wired interface, or at least some may be wirelessly connected through the communication unit 110. For example, in the wireless devices 2510 and 2520, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140) are connected through the communication unit 110. It can be connected wirelessly. In addition, each element, component, unit / unit, and / or module in wireless devices 2510 and 2520 may further include one or more elements. For example, the controller 120 may be composed of one or more processor sets. For example, the control unit 120 may include a set of communication control processor, application processor, electronic control unit (ECU), graphic processing processor, and memory control processor. In another example, the memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and / or combinations thereof.

Hereinafter, the implementation example of FIG. 26 will be described in more detail with reference to the drawings.

Examples of mobile devices to which the present invention is applied

27 illustrates a portable device applied to the present invention. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 27, the mobile device 2510 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. ). The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130/140 in FIG. 24, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The controller 120 may perform various operations by controlling components of the portable device 2510. The controller 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / instructions required for driving the mobile device 2210. Also, the memory unit 130 may store input / output data / information. The power supply unit 140a supplies power to the portable device 2510, and may include a wired / wireless charging circuit, a battery, and the like. The interface unit 140b may support the connection between the mobile device 2510 and other external devices. The interface unit 140b may include various ports (eg, audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c may receive or output image information / signal, audio information / signal, data, and / or information input from a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

For example, in the case of data communication, the input / output unit 140c acquires information / signal (eg, touch, text, voice, image, video) input from the user, and the obtained information / signal is transmitted to the memory unit 130 Can be saved. The communication unit 110 may convert information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station. In addition, after receiving a radio signal from another radio device or a base station, the communication unit 110 may restore the received radio signal to original information / signal. After the restored information / signal is stored in the memory unit 130, it can be output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 140c.

Example AI device to which the present invention is applied

28 illustrates an AI device applied to the present invention. AI devices can be fixed devices or mobile devices, such as TVs, projectors, smartphones, PCs, laptops, digital broadcasting terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, vehicles, etc. It can be implemented as possible devices.

Referring to FIG. 28, the AI device 2510 includes a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a / 140b, a running processor unit 140c, and a sensor unit 140d. It may include. Blocks 110 to 130 / 140a to 140d correspond to blocks 110 to 130/140 in FIG. 24, respectively.

The communication unit 110 uses wired / wireless communication technology to communicate with external devices such as other AI devices (e.g., 22, 2210x, 2220, 400) or AI servers (e.g., 400 in FIG. 24) (eg, sensor information) , User input, learning model, control signals, etc.). To this end, the communication unit 110 may transmit information in the memory unit 130 to an external device or transmit a signal received from the external device to the memory unit 130.

The controller 120 may determine at least one executable action of the AI device 2510 based on information determined or generated using a data analysis algorithm or a machine learning algorithm. Then, the control unit 120 may control components of the AI device 2510 to perform a determined operation. For example, the controller 120 may request, search, receive, or utilize data of the learning processor unit 140c or the memory unit 130, and may be determined to be a predicted operation or desirable among at least one executable operation. Components of the AI device 2510 may be controlled to perform an operation. In addition, the control unit 120 collects historical information including the operation contents of the AI device 2210 or the user's feedback on the operation, and stores the information in the memory unit 130 or the running processor unit 140c, or the AI server ( 22, 400). The collected history information can be used to update the learning model.

The memory unit 130 may store data supporting various functions of the AI device 2510. For example, the memory unit 130 may store data obtained from the input unit 140a, data obtained from the communication unit 110, output data from the running processor unit 140c, and data obtained from the sensing unit 140. In addition, the memory unit 130 may store control information and / or software code necessary for operation / execution of the control unit 120.

The input unit 140a may acquire various types of data from the outside of the AI device 2510. For example, the input unit 140a may acquire training data for model training and input data to which the training model is applied. The input unit 140a may include a camera, a microphone, and / or a user input unit. The output unit 140b may generate output related to vision, hearing, or touch. The output unit 140b may include a display unit, a speaker, and / or a haptic module. The sensing unit 140 may obtain at least one of internal information of the AI device 2510, environment information of the AI device 2510, and user information using various sensors. The sensing unit 140 may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, and / or a radar, etc. have.

The learning processor unit 140c may train a model composed of artificial neural networks using the training data. The learning processor unit 140c may perform AI processing together with the learning processor unit of the AI server (FIGS. 24 and 400). The learning processor unit 140c may process information received from an external device through the communication unit 110 and / or information stored in the memory unit 130. Further, the output value of the running processor unit 140c may be transmitted to an external device through the communication unit 110 and / or stored in the memory unit 130.

29 illustrates an AI server applied to the present invention.

Referring to FIG. 29, the AI server (FIGS. 24 and 400) may refer to an apparatus for learning an artificial neural network using a machine learning algorithm or using a trained artificial neural network. Here, the AI server 400 may be composed of a plurality of servers to perform distributed processing, or may be defined as a 5G network. At this time, the AI server 400 is included as a configuration of a part of the AI device (FIGS. 28 and 2510), and may perform at least a part of AI processing together.

The AI server 400 may include a communication unit 410, a memory 430, a running processor 440, a processor 460, and the like. The communication unit 410 may transmit and receive data with an external device such as an AI device (FIGS. 28 and 2510). The memory 430 may include a model storage unit 431. The model storage unit 431 may store a model (or artificial neural network, 431a) being trained or trained through the learning processor 440. The learning processor 440 may train the artificial neural network 431a using learning data. The learning model may be used while being mounted on the AI server 400 of the artificial neural network, or may be mounted on an external device such as an AI device (FIGS. 28 and 2510). The learning model can be implemented in hardware, software, or a combination of hardware and software. When part or all of the learning model is implemented in software, one or more instructions constituting the learning model may be stored in the memory 430. The processor 460 may infer a result value for the new input data using the learning model, and generate a response or control command based on the inferred result value.

The AI server 400 and / or the AI device 2510 may include a robot 2410a, a vehicle 2410b-1, 2410b-2, an XX (eXtended Reality) device 2410c through a network (FIGS. 24 and 300), It may be applied in combination with a portable device (Hand-held device) 2410d, a home appliance 2410e, an Internet of Thing (IoT) device 2410f. Robot (2410a) with AI technology, vehicle (2410b-1, 2410b-2), eXtended Reality (XR) device (2410c), hand-held device (2410d), home appliance (2410e), IoT (Internet) of Thing) device 2410f may be referred to as an AI device.

Hereinafter, examples of the AI device will be described.

(Example 1st AI device-AI + Robot)

The robot 2410a is applied with AI technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, and an unmanned flying robot. The robot 2410a may include a robot control module for controlling an operation, and the robot control module may mean a software module or a chip implemented with hardware. The robot 2410a acquires state information of the robot 2410a using sensor information obtained from various types of sensors, detects (recognizes) surrounding environment and objects, generates map data, or moves and travels. You can decide on a plan, determine a response to user interaction, or determine an action. Here, the robot 2410a may use sensor information obtained from at least one sensor among a lidar, a radar, and a camera in order to determine a movement route and a driving plan.

The robot 2410a may perform the above operations using a learning model composed of at least one artificial neural network. For example, the robot 2410a may recognize a surrounding environment and an object using a learning model, and determine an operation using the recognized surrounding environment information or object information. Here, the learning model may be directly learned from the robot 2410a, or may be learned from an external device such as the AI server 400. At this time, the robot 2410a may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 400 and receives the generated result accordingly to perform the operation. You may.

The robot 2410a determines a moving path and a driving plan using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the determined moving path and driving plan. Accordingly, the robot 2410a can be driven. The map data may include object identification information for various objects arranged in a space in which the robot 2410a moves. For example, the map data may include object identification information for fixed objects such as walls and doors and movable objects such as flower pots and desks. In addition, the object identification information may include a name, type, distance, and location.

The robot 2410a may perform an operation or travel by controlling a driving unit based on a user's control / interaction. At this time, the robot 2410a may acquire intention information of an interaction according to a user's motion or voice utterance, and may perform an operation by determining a response based on the obtained intention information.

(2nd AI device example-AI + autonomous driving)

The autonomous vehicles 2410b-1 and 2410b-2 are applied with AI technology, and may be implemented as a mobile robot, a vehicle, or an unmanned aerial vehicle. The autonomous driving vehicles 2410b-1 and 2410b-2 may include an autonomous driving control module for controlling an autonomous driving function, and the autonomous driving control module may refer to a software module or a chip implemented with hardware. The autonomous driving control module may be included therein as a configuration of the autonomous driving vehicles 2410b-1 and 2410b-2, but may be configured and connected to the outside of the autonomous driving vehicles 2410b-1 and 2410b-2 with separate hardware. .

The autonomous vehicles 2410b-1 and 2410b-2 acquire status information of the autonomous vehicles 2410b-1 and 2410b-2 using sensor information obtained from various types of sensors, or acquire surrounding environment and objects. It can detect (recognize), generate map data, determine travel paths and driving plans, or determine actions. Here, the autonomous vehicles 2410b-1 and 2410b-2 use sensor information obtained from at least one sensor among a lidar, a radar, and a camera, like the robot 2410a, in order to determine a movement path and a driving plan. You can. In particular, the autonomous driving vehicles 2410b-1 and 2410b-2 receive or recognize sensor information from external devices or an environment or object for an area where a field of view is obscured or a predetermined distance or more, or are recognized directly from external devices. Information can be received.

The autonomous vehicles 2410b-1 and 2410b-2 may perform the above operations using a learning model composed of at least one artificial neural network. For example, the autonomous vehicles 2410b-1 and 2410b-2 may recognize the surrounding environment and objects using a learning model, and may determine a driving line using the recognized surrounding environment information or object information. Here, the learning model may be learned directly from the autonomous vehicles 2410b-1 and 2410b-2, or may be learned from an external device such as the AI server 400. At this time, the autonomous vehicles 2410b-1 and 2410b-2 may perform the operation by generating a result using a direct learning model, but transmit sensor information to an external device such as the AI server 400 and generate accordingly The received result may be received to perform the operation.

The autonomous vehicles 2410b-1 and 2410b-2 determine a movement path and a driving plan using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and control the driving unit The autonomous vehicles 2410b-1 and 2410b-2 may be driven according to the determined travel route and driving plan. The map data may include object identification information for various objects arranged in a space (for example, a road) in which the autonomous vehicles 2410b-1 and 2410b-2 travel. For example, the map data may include object identification information for fixed objects such as street lights, rocks, buildings, and movable objects such as vehicles and pedestrians. In addition, the object identification information may include a name, type, distance, and location.

The autonomous vehicles 2410b-1 and 2410b-2 may perform an operation or travel by controlling a driving unit based on a user's control / interaction. At this time, the autonomous driving vehicles 2410b-1 and 2410b-2 may acquire intention information of an interaction according to a user's motion or voice utterance, and may perform an operation by determining a response based on the obtained intention information.

(3rd AI device example-AI + XR)

XR device 2410c is applied with AI technology, HMD (Head-Mount Display), HUD (Head-Up Display) provided in a vehicle, television, mobile phone, smart phone, computer, wearable device, home appliance, digital signage , It can be implemented as a vehicle, a fixed robot or a mobile robot. The XR device 2410c analyzes 3D point cloud data or image data acquired through various sensors or from an external device to generate location data and attribute data for 3D points, thereby providing information about surrounding spaces or real objects. The XR object to be acquired and output can be rendered and output. For example, the XR device 2410c may output an XR object including additional information about the recognized object in correspondence with the recognized object.

The XR device 2410c may perform the above operations using a learning model composed of at least one artificial neural network. For example, the XR device 2410c may recognize a real object from 3D point cloud data or image data using a learning model, and provide information corresponding to the recognized real object. Here, the learning model may be learned directly from the XR device 2410c or may be learned from an external device such as the AI server 400. At this time, the XR device 2410c may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 400 and receives the generated result accordingly. You can also do

(Example 4 AI device-AI + Robot + Autonomous driving)

The robot 2410a is applied with AI technology and autonomous driving technology, and can be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, and an unmanned flying robot. The robot 2410a to which AI technology and autonomous driving technology are applied may mean a robot itself having an autonomous driving function or a robot 2410a that interacts with autonomous driving vehicles 2410b-1 and 2410b-2. The robot 2410a having an autonomous driving function may move itself according to a given moving line without user control or may determine collectively moving devices by itself. The robot 2410a and the autonomous vehicle 2410b-1 and 2410b-2 with the autonomous driving function may use a common sensing method to determine one or more of a travel path or a driving plan. For example, the robots 2410a and autonomous vehicles 2410b-1 and 2410b-2 with autonomous driving functions may use one or more of a travel path or a driving plan using information sensed through a lidar, radar, or camera. Can decide.

The robot 2410a that interacts with the autonomous vehicles 2410b-1 and 2410b-2 exists separately from the autonomous vehicles 2410b-1 and 2410b-2, while the autonomous vehicles 2410b-1 and 2410b-2 ) May be connected to an autonomous driving function from inside or outside, or may be performed in conjunction with a user who rides on the autonomous vehicles 2410b-1 and 2410b-2. At this time, the robot 2410a that interacts with the autonomous vehicles 2410b-1 and 2410b-2 acquires sensor information on behalf of the autonomous vehicles 2410b-1 and 2410b-2 to obtain autonomous vehicles 2410b-1. , 2410b-2) or by obtaining sensor information and generating surrounding environment information or object information to the autonomous vehicles 2410b-1 and 2410b-2, thereby providing autonomous vehicles 2410b-1 and 2410b-2. ) Can control or assist the autonomous driving function.

The robot 2410a that interacts with the autonomous vehicles 2410b-1 and 2410b-2 monitors the user who boards the autonomous vehicle 2410b or interacts with the users to autonomously drive the vehicles 2410b-1 and 2410b. The function of -2) can be controlled. For example, the robot 2410a activates the autonomous driving function of the autonomous vehicle 2410b-1. 2410b-2 or the autonomous vehicle 2410b-1, 2410b-2 when it is determined that the driver is in a drowsy state. Control of the driving unit can be assisted. Here, the functions of the autonomous vehicles 2410b-1 and 2410b-2 controlled by the robot 2410a are not only autonomous driving functions, but also navigation systems provided inside the autonomous vehicles 2410b-1 and 2410b-2. However, functions provided by the audio system may also be included.

The robot 2410a that interacts with the autonomous vehicles 2410b-1 and 2410b-2 is informed to the autonomous vehicles 2410b-1 and 2410b-2 from outside the autonomous vehicles 2410b-1 and 2410b-2. Can provide or assist a function. For example, the robot 2410a may provide traffic information including signal information to autonomous vehicles 2410b-1 and 2410b-2, such as smart traffic lights, and autonomous vehicles (such as automatic electric chargers for electric vehicles). 2410b-1, 2410b-2) to automatically connect an electric charger to the charging port.

(Example 5 AI device-AI + Robot + XR)

The robot 2410a is applied with AI technology and XR technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, and a drone. The robot 2410a to which the XR technology is applied may mean a robot that is a target of control / interaction within an XR image. In this case, the robot 2410a is separated from the XR device 2410c and can be interlocked with each other.

When the robot 2410a, which is the object of control / interaction within the XR image, acquires sensor information from sensors including a camera, the robot 2410a or the XR device 2410c generates an XR image based on the sensor information. Then, the XR device 2410c may output the generated XR image. In addition, the robot 2410a may operate based on a control signal input through the XR device 2410c or user interaction. For example, the user can check the XR image corresponding to the viewpoint of the robot 2410a remotely linked through an external device such as the XR device 2410c, and adjust the autonomous driving path of the robot 2410a through interaction or , You can control the operation or driving, or check the information of the surrounding objects.

(Example 6th AI device-AI + Autonomous driving + XR)

Autonomous vehicles 2410b-1 and 2410b-2 are applied with AI technology and XR technology, and may be implemented as a mobile robot, a vehicle, or an unmanned aerial vehicle. The autonomous vehicles 2410b-1 and 2410b-2 to which XR technology is applied mean an autonomous vehicle having a means for providing an XR image or an autonomous vehicle that is a target of control / interaction within an XR image. can do. In particular, the autonomous driving vehicles 2410b-1 and 2410b-2, which are targets of control / interaction within the XR image, are separated from the XR device 2410c and may be interlocked with each other.

Autonomous vehicles 2410b-1 and 2410b-2 equipped with means for providing XR images may acquire sensor information from sensors including a camera and output XR images generated based on the acquired sensor information. have. For example, the autonomous vehicle 2410b-1 may provide an XR object corresponding to a real object or an object on the screen to the occupant by outputting an XR image with a HUD. At this time, when the XR object is output to the HUD, at least a portion of the XR object may be output so as to overlap with an actual object facing the occupant's gaze. On the other hand, when the XR object is output to a display provided inside the autonomous vehicles 2410b-1 and 2410b-2, at least a part of the XR object may be output to overlap with an object on the screen. For example, the autonomous vehicles 2410b-1 and 2410b-2 may output XR objects corresponding to objects such as lanes, other vehicles, traffic lights, traffic signs, motorcycles, pedestrians, buildings, and the like.

The autonomous vehicles 2410b-1 and 2410b-2, which are targets of control / interaction within the XR image, acquire sensor information from sensors including the camera, and then the autonomous vehicles 2410b-1 and 2410b-2 ) Or the XR device 2410c may generate an XR image based on sensor information, and the XR device 2410c may output the generated XR image. In addition, the autonomous vehicles 2410b-1 and 2410b-2 may operate based on a user's interaction or a control signal input through an external device such as the XR device 2410c.

The embodiments described above are those in which components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to configure an embodiment of the present invention by combining some components and / or features. The order of the operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is apparent that claims that do not have an explicit citation relationship in the claims can be combined to form an embodiment or included as a new claim by correction after filing.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. For implementation by hardware, one embodiment of the invention is one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), 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 can be stored in memory and driven by a processor. The memory is located inside or outside the processor, and can exchange data with the processor by various known means.

It is 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. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Although the present invention has been mainly described as an example applied to the 3GPP LTE / LTE-A / NR system, it can be applied to various wireless communication systems in addition to the 3GPP LTE / LTE-A / NR system.

Claims (17)

1. In a method of transmitting and receiving data by a base station in a wireless communication system,

   Transmitting downlink control information (downlink control information: DCI) to the terminal,

   The DCI includes first mapping information related to a mapping relationship between a plurality of codewords and a plurality of layers and second mapping information related to a mapping relationship between the plurality of layers and a plurality of antenna ports; And

   And transmitting a first codeword and a second codeword to the terminal based on the DCI,

   The first codeword and the second codeword are mapped to the plurality of layers according to the first mapping information,

   The plurality of layers are mapped to the plurality of antenna pods according to the second mapping information.
2. According to claim 1,

   The method of claim 1, wherein the first mapping information and the second mapping information are co-encoded (jointly ending) and included in the DCI.
3. According to claim 1,

   The plurality of antenna ports are included in a plurality of antenna port groups based on a multiplexing method.
4. The method of claim 3,

   The method of claim 1, wherein at least one antenna port included in the same antenna port group among the plurality of antenna port groups is mapped to the same codeword among the first codeword or the second codeword.
5. The method of claim 3,

   The plurality of antenna ports are characterized in that the same number is included in each of the plurality of antenna port groups.
6. The method of claim 3,

   The multiple antenna ports are multiplexed through code division multiplexing on a time axis and / or a frequency axis.
7. According to claim 1,

   The method of claim 1, wherein the first codeword and the second codeword are transmitted through different channels on different transmission points (TPs).
8. According to claim 1,

   At least one layer mapped to the first codeword or the second codeword among the plurality of layers is mapped to at least one antenna port multiplexed through different CDM methods among the plurality of antenna pods. How to do.
9. In a method for a terminal to transmit and receive data in a wireless communication system,

   Receiving downlink control information (DCI) from a base station,

   The DCI includes first mapping information related to a mapping relationship between a plurality of codewords and a plurality of layers and second mapping information related to a mapping relationship between the plurality of layers and a plurality of antenna ports; And

   And receiving a first codeword and a second codeword from the base station based on the DCI,

   The first codeword and the second codeword are mapped to the plurality of layers according to the first mapping information,

   The plurality of layers are mapped to the plurality of antenna pods according to the second mapping information.
10. In the base station for transmitting and receiving data in a wireless communication system,

    An RF module for transmitting and receiving radio signals; And

    A processor functionally connected to the RF module, the processor comprising:

    Downlink control information (DCI) is transmitted to the terminal,

    The DCI includes first mapping information related to a mapping relationship between a plurality of codewords and a plurality of layers and second mapping information related to a mapping relationship between the plurality of layers and a plurality of antenna ports,

    The first codeword and the second codeword are transmitted to the terminal based on the DCI,

    The first codeword and the second codeword are mapped to the plurality of layers according to the first mapping information,

    The plurality of layers are mapped to the plurality of antenna pods according to the second mapping information.
11. The method of claim 10,

    The base station, characterized in that the first mapping information and the second mapping information are co-encoded (jointly ending) and included in the DCI.
12. The method of claim 11,

    The plurality of antenna ports are included in a plurality of antenna port groups based on a multiplexing method.
13. The method of claim 12,

    At least one antenna port included in the same antenna port group among the plurality of antenna port groups is mapped to the same codeword among the first codeword or the second codeword.
14. The method of claim 12,

    The plurality of antenna ports is a base station, characterized in that the same number is included in each of the plurality of antenna port groups.
15. The method of claim 12,

    The plurality of antenna ports are base stations characterized in that they are multiplexed through code division multiplexing on a time axis and / or a frequency axis.
16. The method of claim 10,

    The base station characterized in that the first codeword and the second codeword are transmitted through different channels on different transmit points (TPs).
17. The method of claim 10,

    At least one layer mapped to the first codeword or the second codeword among the plurality of layers is mapped to at least one antenna port multiplexed through different CDM methods among the plurality of antenna pods. Base station.

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