KR20190087747A - Apparatus and DMRS configuration by UE triggered manner in new radio - Google Patents

Abstract

The present invention relates to a method for demodulation RS (DMRS) configuration in a next generation/5G wireless access network. According to an embodiment of the present invention, in a method for DMRS configuration in a next generation wireless network, a terminal determines the number of additional DMRS based on CSI-RS.

Description

[0001] The present invention relates to a method of setting a UE triggered DMRS in a next generation wireless network,

The present invention describes a method for setting a DMRS in a next generation / 5G radio access network (hereinafter referred to as NR (New Radio) in the present invention). Specifically, the UE directly derives the number of DMRSs required for setting the NR DMRS and the gNB transmission method of the corresponding information.

One embodiment provides a method for configuring a DMRS in a next generation wireless network, wherein the terminal determines the number of additional DMRS based on the CSI-RS.

FIG. 1 illustrates an example of symbol level alignment among different SCSs.
2 is a diagram illustrating an LTE-A DL DMRS structure.
3 is a diagram showing a DMRS structure (one symbol case) of Comb2 + 2CS.
4 is a diagram showing a DMRS structure (2 symbol cases) of Comb2 + 2CS.
5 is a diagram illustrating a 2-FD-OCC DMRS structure (one symbol case).
Figure 6 is a diagram illustrating a 2-FD-OCC DMRS structure (2 symbol case).
7 is a view showing NR beam measurement P1 / P2 / P3.
8 is a diagram illustrating an example of Single symbol CSI-RS setting.
9 is a diagram showing a conceptual diagram of NR SSB configuration.
10 is a diagram showing the location of SSBs in a time domain slot (one SSB is composed of 4 OFDM symbols).
11 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
12 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

As used herein, a wireless communication system refers to a system for providing various communication services such as voice, packet data, and the like. A wireless communication system includes a user equipment (UE) and a base station (BS).

The user terminal is a comprehensive concept that means a terminal in a wireless communication, and it is a comprehensive concept which means a mobile station (MS) in GSM, a mobile station (MS) in UT (User Terminal), a Subscriber Station (SS), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B, a gNode-B, a Low Power Node A sector, a site, various types of antennas, a base transceiver system (BTS), an access point, a point (for example, a transmission point, a reception point, a transmission / reception point) (RRH), a radio unit (RU), and a small cell, as well as a relay cell, a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, an RRH,

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. Macro cell, micro cell, picocell, femtocell, small cell, or 2) the wireless region itself in connection with the wireless region. 1), all of the devices that interact to configure the wireless area to be cooperatively controlled by the same entity are all pointed to the base station. A point, a transmission / reception point, a transmission point, a reception point, and the like are examples of the base station according to the configuration method of the radio area. 2 may direct the base station to the wireless region itself to receive or transmit signals at the point of view of the user terminal or in the vicinity of the neighboring base station.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or a transmission point or a transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

Herein, the user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word Do not.

Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

The time division duplex (TDD) scheme, which is transmitted using different time periods, can be used for the uplink and downlink transmission, and a frequency division duplex (FDD) scheme in which different frequencies are used, a TDD scheme and an FDD scheme A hybrid method can be used.

In the wireless communication system, the uplink and the downlink are configured with reference to one carrier or carrier pair to form a standard.

The uplink and the downlink transmit control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), and the like. The PDSCH (Physical Downlink Shared CHannel), the PUSCH (Physical Uplink Shared CHannel) It is composed of the same data channel and transmits data.

A downlink may refer to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink may refer to a communication or communication path from a terminal to a multiple transmission / reception point. At this time, in the downlink, the transmitter may be a part of the multiple transmission / reception points, and the receiver may be a part of the terminal. Also, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station performs downlink transmission to the UEs. The base station includes downlink control information, such as scheduling, required for reception of a downlink data channel, which is a primary physical channel for unicast transmission, and physical downlink control information for transmitting scheduling grant information for transmission in an uplink data channel. A control channel can be transmitted. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

There are no restrictions on multiple access schemes applied in wireless communication systems. (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA) Various multiple access schemes such as OFDM-CDMA can be used. Here, the NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

One embodiment of the present invention relates to asynchronous wireless communications that evolve into LTE / LTE-Advanced, IMT-2020 over GSM, WCDMA, HSPA, and synchronous wireless communications such as CDMA, CDMA- Can be applied.

In this specification, a MTC (Machine Type Communication) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type. Or a further Enhanced MTC terminal defined in Release-14.

In this specification, NarrowBand Internet of Things (NB-IoT) terminal means a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-rate terminals, low latency sensitivity, ultra-low cost, low power consumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals, May be interpreted as past or presently used meanings or various meanings used in the future.

[5G NR (New Rat)]

3GPP recently approved the study item "Study on New Radio Access Technology" for research on next generation / 5G radio access technology, and based on this, RAN WG1 has frame structure, channel coding and modulation , waveform & multiple access scheme and so on. NR is required not only to improve data transmission rate as compared with LTE, but also to design various QoS requirements that are required according to granular and specific usage scenarios. In particular, enhancement mobile broadband (eMBB), massive MTC (MMTC) and URLLC (Ultra Reliable and Low Latency Communications) are defined as typical usage scenarios of NR. structure design is required. Since each usage scenario has different requirements for data rates, latency, reliability, coverage, etc., it is a method to efficiently satisfy the requirements of each usage scenario through frequency bands constituting an NR system. there is a need for an efficient multiplexing of radio resource units based on subcarrier spacing, subframe, TTI, etc., for example.

One method is to support TDM, FDM or TDM / FDM based multiplexing on one or more NR component carriers (s) for numerology with different subcarrier spacing values, and a scheduling unit in the time domain A discussion was made on how to support more than one time unit in composition. In this regard, NR is a type of time domain structure defined as a subframe. Reference numerology for defining the subframe duration is defined as 14 OFDM symbols of 15 kHz sub-carrier spacing (SCS) based normal CP overhead equivalent to LTE To define a single subframe duration. Thus, subframes in NR have a time duration of 1ms. However, unlike LTE, NR subframes are absolute reference time durations, and slots and mini-slots can be defined as time units that are the basis of actual uplink and downlink data scheduling. In this case, the number of OFDM symbols constituting the slot, y value is defined as y = 7 and 14 for the numerology having the SCS value of up to 60 kHz, and for the numerology having the SCS value larger than 60 kHz, y = Lt; / RTI >

Accordingly, any slot can be composed of 7 or 14 symbols, and all symbols are used for DL transmission according to the transmission direction of the corresponding slot, or all symbols are used for UL transmission, or the DL portion + (gap) + UL portion.

Also, a mini-slot composed of a smaller number of symbols than a corresponding slot is defined in an arbitrary numerology (or SCS), and a short-time time-domain scheduling interval is set for uplink / downlink data transmission or reception, A long-time time-domain scheduling interval for uplink / downlink data transmission and reception can be configured. In particular, in the case of transmission and reception of latency critical data such as URLLC, scheduling is performed in units of 0.5 ms (7 symbols) or 1 ms (14 symbols) based on a numerology-based frame structure having a small SCS value, such as 15 kHz , it is difficult to satisfy the latency requirement. Therefore, it is possible to define a mini-slot composed of a smaller number of OFDM symbols than the corresponding slot and to schedule the latency critical data such as the URLLC based on the defined mini-slot.

Alternatively, as described above, by supporting the numerology having different SCS values in one NR Carrier by multiplexing the TDM and / or FDM scheme, it is possible to reduce the number of slots based on the slot (or mini-slot) length defined for each numerology Scheduling of data according to latency requirement is also considered. For example, when the SCS is 60 kHz as shown in FIG. 1, since the symbol length is reduced to about 1/4 of that of the SCS 15 kHz, if one slot is composed of 7 OFDM symbols, The length is 0.5ms while the slot length based on 60kHz is reduced to about 0.125ms.

In this way, the NR is discussing how to satisfy the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths.

[NR DMRS]

In the existing LTE-A, DL DMRS has defined 8 ports 7-14 to support 8-layer transmission. 2 shows a DMRS structure in which an orthogonal cover code (OCC) is applied for PDSCH transmission in an LTE downlink. Here, the antenna ports 7, 8, 11, and 13 use the DMRS RE shown in blue in FIG. 2, and the antenna ports 9, 10, 12, and 14 use the DMRS RE shown in red. An orthogonal cover code (OCC) is used to maintain the orthogonality between the antenna ports assigned to the same DMRS REs, and the values are shown in Table 1 below.

At present, NR / MIMO is undergoing a new UL / DL DMRS design.

At the RAN1Ad-hoc # 2 meeting, the following agreements were derived for NR DL DMRS (Demodulation RS).

Agreements:

The working assumption made in RAN1#89 for DM-RS is updated and agreed as follows for CP-OFDM:

The working assumption made in RAN1 # 89 for DM-RS is updated and agreed as follows for CP-OFDM:

A UE is configured by higher layers with DMRS pattern either from the front-loaded DMRS Configuration type 1 or from the front-loaded DMRS Configuration type 2 for DL/UL:

A UE is configured with higher layers with DMRS pattern either from the front-loaded DMRS Configuration type 1 or from the front-loaded DMRS Configuration type 2 for DL / UL:

Configuration type 1:

Configuration type 1:

One symbol:

One symbol:

Comb 2 + 2 CS, up to 4 ports

Comb 2 + 2 CS, up to 4 ports

Two symbols:

Two symbols:

Comb 2 + 2 CS + TD-OCC ({1 1} and {1 -1}), up to 8 ports

Comb 2 + 2 CS + TD-OCC ({1 1} and {1 -1}), up to 8 ports

Note: It should be possible to schedule up to 4 ports without using both {1,1} and {1,-1}.

Note: It should be possible to schedule up to 4 ports without using both {1,1} and {1, -1}.

Configuration type 2:

Configuration type 2:

One symbol:

One symbol:

2-FD-OCC across adjacent REs in the frequency domain, up to 6 ports

2-FD-OCC across adjacent REs in the frequency domain, up to 6 ports

Two symbols:

Two symbols:

2-FD-OCC across adjacent REs in the frequency domain + TD-OCC (both {1,1} and {1,-1}) up to 12 ports

2-FD-OCC across adjacent REs in the frequency domain + TD-OCC (both {1,1} and {1, -1}) up to 12 ports

Note: It should be possible to schedule up to 6 ports without using both {1,1} and {1,-1}.

Note: It should be possible to schedule up to 6 ports without using both {1,1} and {1, -1}.

From UE perspective, frequency domain CDMed DMRS ports are QCLed.

From UE perspective, frequency domain CDMed DMRS ports are QCLed.

FFS: Whether the front-load DMRS configuration type for a UE for UL and DL can be different or not.

FFS: Whether the front-load DMRS configuration type for a UE for UL and DL can be different or not.

Note: If there are significant complexity/performance issues involved in the above agreements, down-selection can still be discussed

Note: If there are significant complexity / performance issues involved in the above agreements, down-selection can still be discussed.

To date, it has been determined that two types of DMRS are supported for NR DMRS.

This determines the type of DMRS used through the configuration according to the maximum number of DMRS ports.

Front-loaded DMRS configuration type 1: Comb + CS 구조 + TD-OCC

Front-loaded DMRS configuration type 1: Comb + CS structure + TD-OCC

Front-loaded DMRS configuration type 2: FD-OCC + TDM/TD-OCC

Front-loaded DMRS configuration type 2: FD-OCC + TDM / TD-OCC

 The DMRS structure based on Comb + CS will be described briefly. (Supports up to 8 DMRS ports)

In each configuration, two modes are defined according to the number of symbols to which the DMRS is transmitted. Symbol DMRS shown in FIG. 3 and the 2-symbol DMRS shown in FIG.

First, as shown in FIG. 3, there is a total of two subcarriers according to a 1-symbol Comb 2 + 2 CS structure. Here, the red region and the yellow region are distinguished, and two cyclic shift values are applied to each region, so that a total of four ports can be generated.

Next, FIG. 4 shows a 2-symbol DMRS structure. The basic structure can be considered as a pattern of repeating the case of 1-symbol. However, the only difference is whether to spread by applying any method in the time domain. According to the result of RAN1 AH # 2, TD-OCC = {(1,1), (1, -1)} doubles the maximum number of ports that can be supported since two orthogonal codes are additionally used.

The FD-OCC pattern-based DMRS structure is briefly described. (Supports up to 12 DMRS ports)

In Configuration 2, two modes are defined according to the number of symbols to which the DMRS is transmitted. Symbol DMRS shown in FIG. 5 and the 2-symbol DMRS shown in FIG.

First, as shown in FIG. 5, when the 2-FD-OCC up to 6 ports structure is examined, it can be seen that two consecutive subcarriers are allocated adjacent to each other in the frequency domain. In this case, since 2-FD-OCC basically uses OCC of length-2 (= {(1,1), (1, -1)}), 2 ports can be supported only in the red region. Therefore, a total of six orthogonal ports can be supported in FIG.

Next, FIG. 6 shows a 2-symbol DMRS structure. The basic structure is that TD-OCC is applied to support a maximum of 12 ports based on a 1-symbol DMRS pattern. Here, since two orthogonal codes are additionally used in TD-OCC = {(1,1), (1, -1)} for two time-axis symbols, 12 orthogonal codes Port can be supported.

The present invention describes a method for setting a DMRS in a next generation / 5G radio access network (hereinafter referred to as NR (New Radio) in the present invention). Specifically, the UE directly derives the number of DMRSs required for setting the NR DMRS and the gNB transmission method of the corresponding information.

In this proposal, the terminal can set up the number of additional DMRS symbols in the DMRS.

Basically, it is common for the base station to determine all DMRS configuration information, including the number and location of additional DMRS symbols.

Unlike the existing LTE CRS / DMRS, NR DMRS allows flexible DMRS configuration considering the channel environment of the terminal. Therefore, as mentioned above, only the front-loaded DMRS is fixedly located, which is a common requirement regardless of DMRS configuration type A (= type 1) and type B (= type B).

The existing LTE CRS Escher is always present in the cell, unlike the NR DMRS, and is fixed as the UE acquires the antenna configuration information by detecting the PBCH when the cell is connected. That is, it can always be used regardless of the mobility of the terminal, and supports the CRS-based fallback mode even if it operates in a different transmission mode. However, in NR, there is no RS like LTE CRS, and the DMRS is always set through the configuration and DL-DMRS-add-pos value is set, and the number and position value of additional DMRS are transmitted through this value. Table 2 below shows the number and location of DMRS symbols. Where l ₀ stands for front-loaded DMRS and the remaining digits indicate the location of additional DMRSs.

Corresponding RRC messages related to the PDSCH DMRS configuration are as follows.

Method 1. The terminal determines the number of additional DMRS in the setting of DMRS.

In this proposal, we propose a method of directly determining the dmrs-AdditionalPosition value that is directly involved in setting the RRC signal information related to the DMRS by the gNB.

As mentioned above, in order to decode the NR PDSCH, the number of gNBs can basically be adjusted according to the DMRS configuration. However, this is an appropriate operation when it is assumed that the gNB can accurately determine the channel change information, i.e., mobility related information, of the terminal. However, mobility and channel information may be different for each UE, and all RS configuration information of the NR also operates in a UE-specific manner, so that the UE itself can best perform mobility and channel environment grasp.

Therefore, this proposal describes a method for the terminal to directly determine the number of additional DMRS through UCI information.

At this time, the UCI field may require a maximum of 2 bits. This is because the maximum number of DMRSs with a maximum additional DMRS is four per slot. Next, detection of the time-varying channel by the UE can be performed through various RSs and channels as follows.

- SSB

- Aperiodic CSI-RS / Semi-Persistent CSI-RS / Persistent CSI-RS

- PTRS

Layer-1 UCI reporting on DMRS numbers is also available through various channels.

- Short / long PUCCH or PUSCH

- Periodic: Short / long PUCCH

- Semi-persistent: Short / long PUCCH and PUSCH

- Aperiodic: Short PUCCH and PUSCH

The following is a description of the mobility estimation method that should be considered when selecting specific DMRS numbers.

Measure 1-1: Indirect estimation using repetitive transmission of single symbol CSI-RS.

Basically, one or two port CSI-RS is used for beam measurement. Here, a single symbol CSI-RS is allocated in the same pattern as shown in FIG. 8, and the same Tx beam is repeatedly transmitted. The process can be fully implemented by CSI-RS operation for beam measurement procedure P1 / P2 / P3. First, the basic principle of beam measurement P1 / P2 / P3 is shown in FIG. Here, it seems that the easiest way for the terminal to estimate its own mobility, Doppler, is to utilize beam measurement procedure P3. That is, if the base station uses the same Tx beam and transmits the RS by setting the CSI-RS pattern as shown in FIG. 8 at regular intervals, the terminal can estimate the channel for each single symbol CSI-RS or CSI-RS resource. That is, if the mobility of the UE is low, the channel values estimated by each CSI-RS are similar to each other. However, if the time-varying of the channel due to the mobility of the UE becomes strong, the channels of the respective CSI-RS resources are different from each other. Using this principle, the terminal can estimate its own mobility.

- P1 : is used to enable UE measurement on different TRP Tx beams to support selection of TRP Tx beams and UE Rx beam (s);

- P2 : is used to enable UE measurement on different TRP Tx beams to possibly change inter / intra-TRP Tx beam (s);

- P3 : is used to enable UE measurement on the same TRP Tx beam to change UE Rx beam in the case UE uses beamforming.

At this time, the UE can determine the total number of DMRS settings based on a specific value in consideration of a different degree of channel.

If the channel change value is derived from the terminal as shown in Table 3, it is possible to express each step as 2-bit as a whole. Therefore, the terminal can define the corresponding bit as UCI and report it to the gNB. In addition to the beam measurement P3 using CSI-RS mentioned above, the same principle can be used in P1 / P2.

In the method of estimating the time-domain channel change degree, the UE can use the RSRP / RSSI / RSRQ / received power per symbol unit or the CSI-RS resource unit as a judgment index as well as the pure channel comparison.

Plan 1-2: indirectly estimate mobility using other signals.

Alternatively, Synch. Signal Block (SSB), PTRS, and TRS (CSI-RS configuration). For example, NR SSB supports transmission in the numerology of 15kHz, 30kHz, 120kHz, 240kHz. The maximum number of settings is determined for each frequency region.

* L: The maximum number of SSBs within SS burst

For frequency range up to 3GHz; L=4

For frequency range up to 3 GHz; L = 4

For frequency range from 3GHz to 6GHz; L=8

For frequency range from 3 GHz to 6 GHz; L = 8

For frequency range from 6GHz to 2.6GHz; L=64

For frequency range from 6 GHz to 2.6 GHz; L = 64

The proposed method is based on mobility checking via SSB. Basically, the mobility of the terminal can be estimated both in SSB and CSI-RS, so the principle is the same. However, in order to estimate the mobility, the terminal can be easily estimated when the gnb sets at least the same Tx beam between consecutive SSBs. Therefore, in order to accurately estimate the mobility of the UE, the same Tx beam transmission may be required in a certain SSB transmission interval.

Plans 1-3: Needs Derived DMRS  Number information To UCI  By your own definition on gNB  send.

In this proposal, unlike the existing process of determining the number of DMRS symbols required for the gNB to set up the transmission DMRS based on the CSI feedback information, the necessary DMRS number information detected based on the mobility estimation information of the UE Transmission. In order to transmit the UCI information, the UE can utilize the following uplink channels.

- Short / long PUCCH or PUSCH

- Periodic: Short / long PUCCH

- Semi-persistent: Short / long PUCCH and PUSCH

- Aperiodic: Short PUCCH and PUSCH

In addition to this, since the corresponding message must transmit the setting information value of about 2 bits as mentioned above, it can be added to the existing UCI message, or the already defined money field can be reused and transmitted. For example, a 2 bit A / N field can be used for this purpose, or a reserved field can be used.

The present invention describes a method for setting a DMRS in a next generation / 5G radio access network (hereinafter referred to as NR (New Radio) in the present invention). Specifically, the UE directly derives the number of DMRSs required for setting the NR DMRS and the gNB transmission method of the corresponding information. Thus, it is possible to set the number of DMRS symbols that the gNB and the UE can more accurately correspond to the time-varying channel, thereby providing stable PDSCH decoding performance.

11 is a diagram illustrating a configuration of a base station 1000 according to another embodiment.

11, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The control unit 1010 determines the number of additional DMRS based on the CSI-RS in the method for setting the DMRS in the next-generation wireless network required for performing the above-described present invention. (1000).

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

12 is a diagram illustrating a configuration of a user terminal 1100 according to another embodiment of the present invention.

12, a user terminal 1100 according to another embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1120 may set a DMRS in a next-generation wireless network required for performing the present invention,

And the terminal determines the number of additional DMRS based on the CSI-RS.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

9875 ** The standard content or standard documents referred to in the above embodiments are omitted here for the sake of simplicity of description, and form part of this specification. Therefore, it is to be understood that the content of the above standard content and some of the standard documents is added to or contained in the scope of the present invention, as falling within the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (1)

A method for setting up a DMRS in a next generation wireless network,
Characterized in that the terminal determines the number of additional DMRS based on CSI-RS

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