KR20220038316A - Method and apparatus for transmitting and receiving demodulation reference signal pattern configuration information for nr system - Google Patents

Abstract

Disclosed are a method and apparatus for transmitting and receiving demodulation reference signal (DMRS) pattern configuration information for a new radio (NR) system to support the increased number of layers and the increased number of antenna ports. According to one embodiment of the present invention, a method for transmitting or receiving DMRS pattern setting information in a wireless communication system comprises the following steps: receiving configuration information on candidates of a signaling set for the DMRS pattern configuration information from a base station through higher layer signaling; receiving information indicating one signaling set among the signaling set candidates from the base station through downlink control information (DCI); and receiving a DMRS according to a DMRS pattern determined on the basis of the indicated one signaling set. The signaling set candidates include a combination of at least two elements of a basic pattern overhead, an additional pattern overhead, a basic pattern location, an additional pattern location, and a virtual cell identifier.

Description

Method and apparatus for transmitting and receiving demodulation reference signal pattern setting information for NR system

The present disclosure relates to a wireless communication system, and specifically, to a method and apparatus for transmitting or receiving pattern setting information of a demodulation reference signal for an NR system.

The International Telecommunication Union (ITU) is developing the IMT (International Mobile Telecommunication) framework and standards, and recently, through a program called "IMT for 2020 and beyond", discussions for 5G (5G) communication are in progress. .

In order to meet the requirements presented by "IMT for 2020 and beyond", the 3GPP (3rd Generation Partnership Project) NR (New Radio) system provides various subcarrier spacing in consideration of various scenarios, service requirements, potential system compatibility, etc. (sub-carrier spacing, SCS) is being discussed in the direction of supporting. However, the demodulation reference signal (DeModulation) to support the increased number of layers supported by the NR system, the increased number of antenna ports, and multi-user MIMO (Multi User-Multiple Input Multiple Output, MU-MIMO) for terminals of various operation modes. A pattern configuration for Reference Signal (DMRS) and a method for signaling pattern configuration information have not yet been specifically determined.

It is an object of the present disclosure to provide a method and apparatus for signaling pattern configuration information of a demodulation reference signal supporting an increased number of layers and an increased antenna port.

An additional technical object of the present disclosure is to provide a method and apparatus for dynamically signaling demodulation reference signal pattern configuration information based on a signaling set candidate of demodulation reference signal pattern configuration.

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be able

In a method for signaling demodulation reference signal (DMRS) pattern configuration information in a wireless communication system according to an aspect of the present disclosure, configuration information for candidates of a signaling set for the DMRS pattern configuration information is received from a base station through higher layer signaling. step; receiving information indicating one signaling set among the signaling set candidates from the base station through downlink control information (DCI); and receiving the DMRS according to a DMRS pattern determined based on the indicated one signaling set, wherein the signaling set candidates are: basic pattern overhead, additional pattern overhead, basic pattern position, additional pattern position , or a combination of two or more elements of the virtual cell identifier.

The features briefly summarized above with respect to the present disclosure are merely exemplary aspects of the detailed description of the present disclosure that follows, and do not limit the scope of the present disclosure.

According to the present disclosure, a method and apparatus for signaling pattern configuration information of a demodulation reference signal supporting an increased number of layers and an increased antenna port may be provided.

According to the present disclosure, a method and apparatus for dynamically signaling demodulation reference signal pattern setting information based on a signaling set candidate of demodulation reference signal pattern setting can be provided.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1 is a diagram illustrating examples of a DMRS pattern according to the present disclosure.
2 is a diagram illustrating additional examples of a DMRS pattern according to the present disclosure.
3 to 10 are diagrams illustrating various examples of a DMRS pattern in one PRB according to the present disclosure.
11 is a diagram for explaining a DMRS pattern configuration information signaling method according to the present disclosure.
12 is a diagram illustrating the configuration of a base station apparatus and a terminal apparatus according to the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present disclosure pertains can easily implement them. However, the present disclosure may be embodied in several different forms and is not limited to the embodiments described herein.

In describing an embodiment of the present disclosure, if it is determined that a detailed description of a well-known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. And, in the drawings, parts not related to the description of the present disclosure are omitted, and similar reference numerals are attached to similar parts.

In the present disclosure, when a component is "connected", "coupled" or "connected" to another component, it is not only a direct connection relationship, but also an indirect connection relationship in which another component exists in the middle. may also include. In addition, when a component is said to "include" or "have" another component, it means that another component may be further included without excluding other components unless otherwise stated. .

In the present disclosure, terms such as first, second, etc. are used only for the purpose of distinguishing one component from other components, and unless otherwise specified, the order or importance between the components is not limited. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment is referred to as a first component in another embodiment. can also be called

In the present disclosure, the components that are distinguished from each other are for clearly explaining each characteristic, and the components do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form one hardware or software unit, or one component may be distributed to form a plurality of hardware or software units. Accordingly, even if not specifically mentioned, such integrated or distributed embodiments are also included in the scope of the present disclosure.

In the present disclosure, components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment composed of a subset of components described in an embodiment is also included in the scope of the present disclosure. In addition, embodiments including other components in addition to components described in various embodiments are also included in the scope of the present disclosure.

The present disclosure describes a wireless communication network as a target, and an operation performed in the wireless communication network is performed in the process of controlling the network and transmitting or receiving a signal in a system (eg, a base station) having jurisdiction over the wireless communication network, or This can be done in the process of transmitting or receiving a signal from a terminal coupled to a wireless network.

It is obvious that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), a gNodeB (gNB), and an access point (AP). In addition, 'terminal' may be replaced by terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), and non-AP station. can

In the present disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or a signal through a corresponding channel. For example, transmitting the control channel means transmitting control information or a signal through the control channel. Similarly, to transmit a data channel means to transmit data information or a signal over the data channel.

In the following description, the term NR system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from an existing system, but the scope of the present disclosure is not limited by these terms. In addition, the term NR system in the present specification is used as an example of a wireless communication system capable of supporting various sub-carrier spacing (SCS), but the term NR system itself supports a plurality of SCS wireless communication It is not limited to the system.

First, numerology considered in the NR system will be described.

The NR numerology may mean a numerical value for a basic element or factor for generating a resource grid in a time-frequency domain for designing an NR system. For example, as an example of the numerology of 3GPP LTE / LTE-A system, subcarrier spacing corresponds to 15 kHz (or 7.5 kHz in the case of MBSFN (Multicast-Broadcast Single-Frequency Network)). However, the term "numerology" does not mean only the subcarrier spacing limitedly, and has a relationship with the subcarrier spacing (or is determined based on the subcarrier spacing) CP (Cyclic Prefix) length, TTI (Transmit Time Interval) ) length, the number of orthogonal frequency division multiplexing (OFDM) symbols within a predetermined time interval, and the duration of one OFDM symbol. That is, different numerologies may be distinguished from each other by having different values in one or more of subcarrier spacing, CP length, TTI length, the number of OFDM symbols within a predetermined time interval, or the duration of one OFDM symbol.

In order to meet the requirements presented by "IMT for 2020 and beyond", the current 3GPP NR system is considering multiple numerologies in consideration of various scenarios, various service requirements, and compatibility with potential new systems. More specifically, as the numerology of the existing wireless communication system, it is difficult to support the higher frequency band, faster moving speed, lower delay, etc. required by "IMT for 2020 and beyond". It is necessary to define

For example, the NR system may support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC)/Ultra Machine Type Communications (uMTC), and Ultra-Reliable and Low Latency Communications (URLLC). In particular, the requirements for user plane latency for URLLC or eMBB services are 0.5 ms in uplink and 4 ms in both uplink and downlink, which are 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems. It requires a significant latency reduction compared to the latency requirement of 10ms.

In order to satisfy such various scenarios and various requirements in one NR system, it is required to support various neurology. In particular, unlike supporting one subcarrier spacing (SCS) in the existing LTE/LTE-A system, it is required to support a plurality of SCSs.

In order to solve the problem of not being able to use a wide bandwidth in a conventional frequency range or carrier, such as 700 MHz or 2 GHz, a new neurology for NR systems including supporting multiple SCSs, 6 GHz Alternatively, it may be determined assuming a wireless communication system operating in a frequency range or carrier such as 40 GHz, but the scope of the present disclosure is not limited thereto.

In such an NR system, a demodulation reference signal (DMRS) is required for demodulation of a specific physical channel. For example, DMRS for demodulation of a physical data channel, DMRS for demodulation of a physical control channel, etc. may be defined in the NR system.

Specifically, the NR system can support up to 8 or up to 16 layers for single user (SU)-MIMO transmission, and up to 12 for multiple user (MU)-MIMO transmission. It can support orthogonal layers. These layers may be mapped to an antenna port (ie, a logical antenna) and transmitted through a physical channel. Here, in order to correctly demodulate a signal transmitted through each layer or antenna port of a physical channel, a reference signal for the corresponding layer or antenna port is required, and this may be referred to as DMRS.

In the present disclosure, in order to support the increased number of layers and the increased number of antenna ports in the NR system, a DMRS mapping time-frequency resource is determined, and the DMRS for different antenna ports mapped on the same time-frequency resource is used. Examples of a new DMRS configuration and a signaling scheme for the base station to indicate the DMRS configuration to each terminal will be described.

Hereinafter, various examples of the present disclosure for a DMRS layer, an antenna port, a sequence, and multiplexing for an NR system will be first described. These examples are for a new DMRS configuration that can support both SU-MIMO and MU-MIMO requirements in an NR system. In addition, these examples may correspond to a DMRS configuration scheme in consideration of basic DL transmission from a base station to a terminal in an NR system, and a DMRS configuration scheme for MU-MIMO considering both SL and DL (that is, configuration for SL DMRS and It may correspond to the setting for DL DMRS). The scope of the present disclosure is not limited thereto, and includes examples of DMRS configuration for various purposes that can be supported by the NR system.

In the following examples, it is assumed that the maximum number of DMRS orthogonal antenna ports (hereinafter, DMRS antenna ports) is 12. For example, DMRS antenna port numbers #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12 are defined. However, the actual DMRS antenna port number may be given a different number to distinguish it from other types of RS antenna port numbers. If the first DMRS antenna port number is given as #p, the 12 DMRS antenna port numbers are #p, #p+1, #p+2, #p+3, #p+4, #p+5, # It can be assigned as p+6, #p+7, #p+8, #p+9, #p+10, #p+11.

In addition, it is assumed that the maximum number of DMRS layers that can be allocated to each terminal is 16 or maximum 8.

When the number of DMRS layers that can be assigned to each UE is 16, each layer may correspond to a distinct combination of an antenna port and a sequence type. A sequence type may be distinguished by a value of a scrambling ID (SCID) used to generate a sequence used as a DMRS. For example, a DMRS sequence generated using A as the SCID value may be distinguished from a DMRS sequence generated using B as the SCID value. Antenna port-SCID combination for DMRS may be defined, for example, as shown in Table 1 below, and each of 16 layers may correspond to one combination.

combination antenna port scrambling ID #One #One A #2 #2 A #3 #3 A #4 #4 A #5 #5 A #6 #6 A #7 #7 A #8 #8 A #9 #9 A #10 #10 A #11 #11 A #12 #12 A #13 #9 B #14 #10 B #15 #11 B #16 #12 B

In the example of Table 1, DMRS antenna port numbers #1 to #8 use a sequence generated based on one SCID (eg, A), and DMRS antenna port numbers #9 to #12 use two SCIDs (eg For example, a sequence generated based on A and B) may be used. In addition, the SCID value may be A=0 and B=1, but is not limited thereto. For example, when the DMRS is based on a pseudo-random noise (PN) sequence, the initialization value of the PN sequence may include the SCID. Alternatively, the PN sequence initialization value may include a value specific to one or more of a cell (or terminal group), time, or frequency, but is not limited thereto.

When the number of DMRS layers that can be allocated per each UE is 8, each layer has DMRS antenna port numbers #1, #2, #3, #4, #5, #6, #7, #8, #9, It may correspond to any one of any 8 antenna ports among #10, #11, and #12.

Hereinafter, examples of a DMRS pattern for an NR system will be described.

The DMRS pattern includes a time-frequency resource to which the DMRS is mapped, and a multiplexing scheme of different DMRS antenna ports mapped to the same time-frequency resource.

In the NR system, the DMRS mapping resource is defined in units of a physical resource block (PRB) defined by one slot in the time domain and 12 subcarriers in the frequency domain. Here, one slot means a time unit corresponding to a total of 7 symbols or a total of 14 symbols according to the SCS in the time domain. In addition, a physical resource unit corresponding to one symbol and one subcarrier is referred to as one resource element (RE). Accordingly, one PRB may include 7*12 REs or 14*12 REs according to the SCS.

The DMRS for the NR system may be basically disposed in one or two consecutive OFDM symbols in the front part in time within one slot, and additional DMRS (e.g., it is necessary to support a channel that changes rapidly in time due to a fast movement speed) DMRS) used when there is may be arranged later in time of one slot.

This additional DMRS may be applied to a high Doppler scenario, and may have the same or lower density in the frequency domain as compared to the DMRS in the front part of the slot.

In addition, at least in the case of CP (Cyclic Prefix)-OFDM, a common DMRS structure for downlink (DL) and uplink (UL) may be supported in the NR system. For example, DMRSs for the same link or DMRSs for different links may be configured to be orthogonal to each other.

In addition, for DL DMRS antenna port multiplexing, one or more of Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), or Code Division Multiplexing (CDM) may be applied. As a multiplexing resource for CDM, code resources such as an orthogonal cover code (OCC) and a cyclic shift may be used. Also, CDM can be applied in time domain, frequency domain or time and frequency domain.

1 is a diagram illustrating examples of a DMRS pattern according to the present disclosure.

1 illustrates a case in which 12 DMRS antenna ports are configured in 6 code division multiplexing (CDM) groups. For example, two DMRS antenna ports may be included in one CDM group as shown in Table 2 below.

CDM group antenna port #A #1, #2 #B #3, #4 #C #5, #6 #D #7, #8 #E #9, #10 #F #11, #12

In the example of Table 2, different CDM groups may be distinguished by one or more of different frequency resources or different time resources. Here, the frequency resource may be a subcarrier, and the time resource may be a symbol. That is, DMRS antenna ports belonging to different CDM groups may be multiplexed in a frequency division multiplexing (FDM) method by being mapped to different subcarriers, or may be multiplexed in a time division multiplexing (TDM) method by being mapped to different OFDM symbols. It may also be multiplexed in FDM and TDM schemes by being mapped onto different subcarriers and different OFDM symbols. Two DMRS antenna ports belonging to one and the same CDM group may be distinguished by an orthogonal cover code (OCC). there is. In order to distinguish two antenna ports, an OCC of length 2 may be used. In addition, OCC may be applied in the time domain or may be applied in the frequency domain. For example, OCC of length-2 may be applied over two OFDM symbols or may be applied over two subcarriers.

1 shows REs to which DMRSs are mapped in one PRB. The symbol index l may correspond to the index (eg, l=2) of the first symbol excluding the control region in one slot. Also, the 12 subcarriers in the frequency domain may be subcarriers belonging to the m-th PRB.

In the example of FIG. 1(a), a case in which DMRS is mapped to up to three symbols (ie, l, l+1, and l+l') in one slot is shown. Here, l' may be a value greater than 2.

In addition, FIG. 1(a) shows an example in which OCC of length-2 is applied in the frequency domain. Specifically, CDM groups #A and #B are mapped to symbol index l, and they may be distinguished from each other in an FDM manner. CDM groups #C and #D are mapped to symbol index l+1, and they can be distinguished from each other in an FDM manner. CDM groups #E and #F are mapped to the symbol index l+1', and they can be distinguished from each other in an FDM manner.

Each CDM group can be repeated up to 3 times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is three REs.

In the example of FIG. 1(b), the DMRS is mapped to up to two symbols (ie, 1, 1+1) in one slot.

Also, FIG. 1(b) shows an example in which OCC of length-2 is applied in the frequency domain. Specifically, CDM groups #A, #B, and #C are mapped to symbol index l, and they may be distinguished from each other in an FDM manner. CDM groups #D, #E, and #F are mapped to symbol index l+1, and they may be distinguished from each other in an FDM manner.

Each CDM group can be repeated up to two times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is two REs.

In the example of FIG. 1(c), the DMRS is mapped to up to four symbols (ie, l, l+1, l+l', l+l'+1) in one slot.

In addition, FIG. 1(c) shows an example in which OCC of length-2 is applied in the time domain. Specifically, CDM groups #A, #B, #C, and #D are mapped to symbol indices l and l+1, and they may be distinguished from each other in an FDM manner. CDM groups #E and #F are mapped to symbol indices l+l' and l+l'+1, and they can be distinguished from each other in an FDM manner.

Each CDM group can be repeated up to 3 times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is three REs.

In the example of FIG. 1(d), the DMRS is mapped to up to two symbols (ie, 1, 1+1) in one slot.

Also, FIG. 1( d ) shows an example in which OCC of length-2 is applied in the time domain. Specifically, CDM groups #A, #B, #C, #D, #E, and #F are mapped to symbol indices l and l+1, and they may be distinguished from each other in an FDM manner.

Each CDM group can be repeated up to two times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is two REs.

2 is a diagram illustrating additional examples of a DMRS pattern according to the present disclosure.

The example of FIG. 2 shows a case in which 12 DMRS antenna ports are configured in three CDM groups. For example, as shown in Table 3 below, four DMRS antenna ports may be included in one CDM group.

CDM group antenna port #A #1, #2, #3, #4 #B #5, #6, #7, #8 #C #9, #10, #11, #12

In the example of Table 3, different CDM groups may be distinguished by one or more of different frequency resources or different time resources. Here, the frequency resource may be a subcarrier, and the time resource may be a symbol. That is, DMRS antenna ports belonging to different CDM groups may be multiplexed in the FDM scheme by being mapped to different subcarriers, may be multiplexed in the TDM scheme by being mapped to different OFDM symbols, and may have different subcarriers and different subcarriers. It may be multiplexed in FDM and TDM schemes by being mapped onto OFDM symbols. Four DMRS antenna ports belonging to one and the same CDM group may be distinguished by OCC. In order to distinguish four antenna ports, an OCC of length 4 may be used. In addition, OCC may be applied in the time domain, applied in the frequency domain, or applied in the time-frequency domain. For example, OCC of length-4 may be applied over 4 OFDM symbols, applied over 4 subcarriers, or applied over 2 OFDM symbols and 2 subcarriers.

In the examples of FIG. 2, REs to which DMRSs are mapped in one PRB are indicated. The symbol index l may correspond to the index (eg, l=2) of the first symbol excluding the control region in one slot. Also, the 12 subcarriers in the frequency domain may be subcarriers belonging to the m-th PRB.

In the example of FIG. 2( a ), the DMRS is mapped to up to three symbols (ie, l, l+1, and l+l') in one slot. Here, l' may be a value greater than 2.

In addition, FIG. 2( a ) shows an example in which OCC of length-4 is applied in the frequency domain. Specifically, CDM group #A may be mapped to symbol index l, CDM group #B may be mapped to symbol index l+1, and CDM group #C may be mapped to symbol index l+1'.

Each CDM group can be repeated up to 3 times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is three REs.

The example of FIG. 2(b) shows a case in which DMRS is mapped to up to two symbols (ie, 1, 1+1) in one slot.

In addition, FIG. 2(b) shows an example in which OCC of length-4 is applied in the frequency domain.

For example, CDM groups #A, #B, and #C are mapped to symbol index l, and they may be distinguished from each other in an FDM manner. CDM groups #A, #B, and #C are mapped to symbol index l+1, and they may be distinguished from each other in an FDM manner. Here, each CDM group may be configured in only one symbol or in both symbols according to overhead.

That is, each of CDM group #A, CDM group #B, and CDM group #C is configured in symbol index 1, and may be additionally configured in symbol index 1+1 according to overhead. Alternatively, CDM group #A is repeatedly configured once or twice depending on overhead only in symbol index l, and CDM group #C is repeatedly configured only in symbol index l+1 depending on overhead once or twice, and CDM group #C may be configured only in symbol index l or both in symbol index l and symbol index l+1 according to overhead.

Each CDM group can be repeated up to two times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is two REs.

The example of FIG. 2(c) shows a case in which DMRS is mapped to up to four symbols (ie, l, l+1, l+l', l+l'+1) in one slot.

In addition, FIG. 2(c) shows an example in which OCC of length-4 is applied in the time-frequency domain. Specifically, CDM groups #A and #B are mapped to symbol indices l and l+1, and they may be distinguished from each other in an FDM manner. CDM group #C may be mapped to symbol indexes l+l' and l+l'+1.

Each CDM group can be repeated up to 3 times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is three REs.

In the example of FIG. 2(d), a DMRS is mapped to up to two symbols (ie, 1, 1+1) in one slot.

In addition, FIG. 2(d) shows an example in which OCC of length-4 is applied in the time-frequency domain. Specifically, CDM groups #A, #B, and #C are mapped to symbol indices l and l+1, and they may be distinguished from each other in an FDM manner.

Each CDM group can be repeated up to two times within one PRB on the frequency axis. That is, it can be said that the maximum overhead occupied by one port in one PRB is two REs.

Hereinafter, more specific examples of the DMRS pattern according to the present disclosure will be described. In the examples of the DMRS pattern described below, in one slot (eg, n-th slot) in the time domain and one PRB (eg, m-th PRB) corresponding to 12 subcarriers in the frequency domain DMRS pattern. The example DMRS pattern may be repeated in one or more additional slots or one or more PRBs.

In the examples of FIGS. 3 to 6 described below, two DMRS antenna ports are mapped to one CDM group as in the examples of FIGS. 1 and 2, and a total of 6 CDM groups for a total of 12 DMRS antenna ports. can be configured.

3 is a diagram illustrating an example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 3 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 1(a). That is, in the DMRS pattern of FIG. 3, basically, CDM groups #A and #B that are distinguished from each other by FDM are mapped to the first symbol, and CDM groups #C and #D that are distinguished from each other by FDM are mapped to the second symbol. is mapped, and CDM groups #E and #F, which are distinguished from each other in an FDM manner, may be mapped to the third symbol.

First, an OCC mapping method will be described with reference to FIG. 3A.

As shown in Fig. 3(a), in all cases, for two REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (eg, RE having a low subcarrier index) ), a may be applied as an OCC value, and b may be applied as an OCC value to the second RE (eg, RE having a high subcarrier index). OCC values a and b may be given as shown in Table 4 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group a +1 +1 b +1 -One

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1 and +1 are applied over two REs in the frequency direction, and for DMRS antenna port #2 of CDM group #A, OCC of +1 and -1 can be applied across two REs. Each CDM group repeats 1 time (FIG. 3(b)) and repetition 2 times (FIG. 3(c)) within one PRB on the frequency axis. ), or by repeating three times (FIG. 3(d)).

If the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 3(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of one RE can

In FIG. 3(b), each CDM group applies a CDM (ie, CDM2) by OCC of length-2 on the frequency axis to two consecutive or discontinuous REs on the frequency axis within one symbol, and this It only shows an example of repeating once in one PRB on the frequency axis (that is, using two REs for two DMRS antenna ports in one PRB), in the slot for the DMRS REs of FIG. 3(b). The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

As in the example of FIG. 3(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of two REs. can

In FIG. 3( c ), each CDM group applies a CDM (ie, CDM2) by OCC of length-2 on the frequency axis to two consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating twice in one PRB on the frequency axis (that is, using four REs for two DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

As in the example of FIG. 3(d), if the DMRS mapping pattern is repeated 3 times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 REs per port (ie, 3REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 6 REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 3 REs. can

In FIG. 3(d), each CDM group applies a CDM (ie, CDM2) by OCC of length-2 on the frequency axis to two consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating 3 times in one PRB on the frequency axis (that is, using 6 REs for two DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 3(d) The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to a rear part of a slot in consideration of a high Doppler scenario by using the basic pattern shown in FIGS. 3(b) to 3(d).

Specifically, in Figs. 3(b) to 3(d), the DMRS is mapped pattern (as in the example of Fig. 1(a) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 1-1, 1-2, and 1-3, respectively. Based on this, as shown in Table 5 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a temporally later part in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) One 1-1 does not exist 2 1-2 does not exist 3 1-3 does not exist 4 1-1 1-1 5 1-1 1-2 6 1-1 1-3 7 1-2 1-1 8 1-2 1-2 9 1-2 1-3 10 1-3 1-1 11 1-3 1-2 12 1-3 1-3

The examples of FIGS. 3(e) and 3(f) correspond to DMRS pattern Examples 10 and 12 of Table 5, respectively. 4 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 4 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 1(b). That is, in the DMRS pattern of FIG. 4, basically, CDM groups #A, #B, and #C divided by FDM method are mapped to the first symbol, and CDM group #D divided by FDM method to each other in the second symbol, #E and #F may be mapped.

First, an OCC mapping method will be described with reference to FIG. 4( a ).

As shown in FIG. 4( a ), in all cases, for two REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (eg, RE having a low subcarrier index) ), a may be applied as an OCC value, and b may be applied as an OCC value to the second RE (eg, RE having a high subcarrier index). OCC values a and b may be given as shown in Table 6 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group A +1 +1 B +1 -One

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1 and +1 are applied over two REs in the frequency direction, and for DMRS antenna port #2 of CDM group #A, OCC of +1 or -1 can be applied across two REs. Each CDM group is repeated 1 time (Fig. 4(b)) or 2 repetitions (Fig. 4(c)) within one PRB in the frequency axis. )) can be configured.

* If the DMRS mapping pattern is repeated once in one PRB as in the example of FIG. 4(b), it is expressed as that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). can That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of one RE can

In FIG. 4(b), each CDM group applies a CDM (ie, CDM2) by OCC of length-2 on the frequency axis to two consecutive or discontinuous REs on the frequency axis within one symbol, and this It only shows an example of repeating once in one PRB on the frequency axis (that is, using two REs for two DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 4(b). The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice within one PRB as in the example of FIG. 4(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of two REs. can

In FIG. 4(c), each CDM group applies a CDM (ie, CDM2) by OCC of length-2 on the frequency axis to two consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating twice in one PRB on the frequency axis (that is, using four REs for two DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 4(c) The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to the rear part of the slot in consideration of a high Doppler scenario by using the basic pattern shown in FIGS. 4(b) and 4(c).

Specifically, in Figs. 4(b) and 4(c), the DMRS is mapped pattern (as in the example of Fig. 1(b), except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 2-1 and 2-2, respectively. Based on this, as shown in Table 7 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a temporally later part in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 13 2-1 does not exist 14 2-2 does not exist 15 2-1 2-1 16 2-1 2-2 17 2-2 2-1 18 2-2 2-2

Examples of FIGS. 4(d) and 4(e) correspond to DMRS pattern Examples 17 and 18 of Table 7, respectively. As an additional example, based on patterns 2-1 and 2-2, as shown in Table 8 below, the DMRS according to the basic pattern is mapped in the front part in time in one slot, and the first additional pattern in the later part in time in the same slot and DMRS according to the second additional pattern may be mapped.

DMRS pattern example basic pattern
(in front of the slot) first additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 19 2-1 does not exist does not exist 20 2-2 does not exist does not exist 21 2-1 2-1 does not exist 22 2-1 2-2 does not exist 23 2-2 2-1 does not exist 24 2-2 2-2 does not exist 25 2-1 2-1 2-1 26 2-1 2-1 2-2 27 2-1 2-2 2-1 28 2-1 2-2 2-2 29 2-2 2-1 2-1 30 2-2 2-1 2-2 31 2-2 2-2 2-1 32 2-2 2-2 2-2

4(f) and 4(g) correspond to DMRS pattern Examples 29 and 32 of Table 8, respectively. 5 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 5 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 1(c). That is, in the DMRS pattern of FIG. 5, by default, CDM groups #A, #B, #C, #D, which are distinguished from each other by FDM method, are mapped to the first and second symbols, and FDM to the third and fourth symbols. CDM groups #E and #F that are distinguished in this way may be mapped.

First, an OCC mapping method will be described with reference to FIG. 5( a ).

As shown in FIG. 5( a ), for two REs that are the same or different on the frequency axis within two symbols to which each CDM group is mapped, the mapping method of case #1 and the mapping method of case #2 are changed in the frequency direction. can be applied alternately. According to the mapping method of Case #1, a is applied as an OCC value to the first RE (eg, RE having a low symbol index), and an OCC value is applied to the second RE (eg, RE having a high symbol index). b can be applied. According to the mapping method of Case #2, b is applied as an OCC value to the first RE (eg, RE having a low symbol index), and an OCC value is applied to the second RE (eg, RE having a high symbol index) a can be applied as

In this way, when case #1 and case #2 are alternately applied in the frequency direction, power balancing when only the same OCC value (eg, a) is mapped on one symbol may become a problem. Therefore, this is to alternately map different OCC values a and b to one symbol.

For example, if a CDM group is repeated C times on the frequency axis for two symbols to which each CDM group is mapped, if the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the repetition index, and case #2 may be applied in the odd-numbered repetition index.

OCC values a and b can be given as shown in Table 9 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group a +1 +1 b +1 -One

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1 and +1 are applied over two REs in the time direction, and for DMRS antenna port #2 of CDM group #A in the time direction OCC of +1 and -1 can be applied across two REs. Each CDM group repeats 1 time (FIG. 5(b)) and repetition 2 times (FIG. 5(c)) within one PRB on the frequency axis. ), or by repeating 3 times (FIG. 5(d)).

If the DMRS mapping pattern is repeated once in one PRB as in the example of FIG. 5(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of one RE can

In FIG. 5(b), each CDM group is a CDM (ie, CDM2) by OCC of length-2 on the time axis for the same or different two REs on the frequency axis within two consecutive or discontinuous symbols. Applied, this only shows an example of repeating once in one PRB (ie, using two REs for two DMRS antenna ports in one PRB) on the frequency axis, for the DMRS REs of FIG. 5(b) The specific symbol index in the slot and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position in advance or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice within one PRB as in the example of FIG. 5(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of two REs. can

In Figure 5(c), each CDM group is a CDM (ie, CDM2) by OCC of length-2 on the time axis for the same or different two REs on the frequency axis within two consecutive or discontinuous symbols. Applied, this only shows an example of repeating twice in one PRB (ie, using 4 REs for two DMRS antenna ports in one PRB) on the frequency axis, and for the DMRS REs of FIG. The specific symbol index in the slot and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position in advance or a position signaled by the base station.

As in the example of FIG. 5(d), if the DMRS mapping pattern is repeated 3 times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 REs per port (ie, 3REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 6 REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 3 REs. can

In FIG. 5(d), each CDM group is a CDM (ie, CDM2) by OCC of length-2 on the time axis for two REs that are the same or different on the frequency axis within two consecutive or discontinuous symbols. Applied, this only shows an example of repeating 3 times in one PRB on the frequency axis (that is, using 6 REs for two DMRS antenna ports in one PRB), for the DMRS REs of FIG. 5(d) The specific symbol index in the slot and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position in advance or a position signaled by the base station.

5(b) to 5(d), an additional DMRS may be mapped to the rear part of the slot in consideration of a high Doppler scenario.

Specifically, in Figs. 5(b) to 5(d), the DMRS is mapped pattern (as in the example of Fig. 1(c) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 3-1, 3-2, and 3-3, respectively. Based on this, as shown in Table 10 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a temporally later part in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 33 3-1 does not exist 34 3-2 does not exist 35 3-3 does not exist 36 3-1 3-1 37 3-1 3-2 38 3-1 3-3 39 3-2 3-1 40 3-2 3-2 41 3-2 3-3 42 3-3 3-1 43 3-3 3-2 44 3-3 3-3

5(e) and 5(f) correspond to DMRS pattern Examples 42 and 44 of Table 10, respectively. 6 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 6 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 1(d). That is, in the DMRS pattern of FIG. 6 , basically, CDM groups #A, #B, #C, #D, #E, and #F that are distinguished from each other in an FDM manner may be mapped to the first and second symbols.

First, an OCC mapping method will be described with reference to FIG. 6( a ).

As shown in FIG. 6( a ), for two REs that are the same or different on the frequency axis within two symbols to which each CDM group is mapped, the mapping method of case #1 and the mapping method of case #2 are changed in the frequency direction. can be applied alternately. According to the mapping method of Case #1, a is applied as an OCC value to the first RE (eg, RE having a low symbol index), and an OCC value is applied to the second RE (eg, RE having a high symbol index). b can be applied. According to the mapping method of Case #2, b is applied as an OCC value to the first RE (eg, RE having a low symbol index), and an OCC value is applied to the second RE (eg, RE having a high symbol index) a can be applied as

In this way, when case #1 and case #2 are alternately applied in the frequency direction, power balancing when only the same OCC value (eg, a) is mapped on one symbol may become a problem. Therefore, this is to alternately map different OCC values a and b to one symbol.

For example, if a CDM group is repeated C times on the frequency axis for two symbols to which each CDM group is mapped, if the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the repetition index, and case #2 may be applied in the odd-numbered repetition index.

OCC values a and b may be given as shown in Table 11 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group a +1 +1 b +1 -One

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1 and +1 are applied over two REs in the time direction, and for DMRS antenna port #2 of CDM group #A in the time direction OCC of +1 or -1 can be applied across two REs. Each CDM group repeats 1 time (FIG. 6(b)), or repetition 2 times (FIG. 4(c)) within one PRB in the frequency axis. )) can be configured.

When the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 6(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of one RE can

In FIG. 6(b), each CDM group is a CDM (ie, CDM2) by OCC of length-2 on the time axis for the same or different two REs on the frequency axis within two consecutive or discontinuous symbols. Applied, this only shows an example of repeating once in one PRB on the frequency axis (that is, using two REs for two DMRS antenna ports in one PRB), for the DMRS REs of FIG. 6(b) The specific symbol index in the slot and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position in advance or a position signaled by the base station.

When the DMRS mapping pattern is repeated twice within one PRB as in the example of FIG. 6(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of two REs. can

In Figure 6(c), each CDM group is a CDM (ie, CDM2) by OCC of length-2 on the time axis for the same or different two REs on the frequency axis within two consecutive or discontinuous symbols. Applied, this only shows an example of repeating twice in one PRB (ie, using 4 REs for two DMRS antenna ports in one PRB) on the frequency axis, and for DMRS REs of FIG. 6(c) The specific symbol index in the slot and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position in advance or a position signaled by the base station.

An additional DMRS may be mapped to the rear part of the slot in consideration of a high Doppler scenario by using the basic pattern shown in FIGS. 6(b) and 6(c).

Specifically, in Figs. 6(b) and 6(c), the DMRS is mapped pattern (as in the example of Fig. 1(a), except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency ) can be defined as patterns 4-1 and 4-2, respectively. Based on this, as shown in Table 12 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a later temporally in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 45 4-1 does not exist 46 4-2 does not exist 47 4-1 4-1 48 4-1 4-2 49 4-2 4-1 50 4-2 4-2

6(d) and 6(e) correspond to DMRS pattern examples 49 and 50 of Table 12, respectively. As an additional example, based on the patterns 4-1 and 4-2, as shown in Table 13 below, the DMRS according to the basic pattern is mapped in the front part in time in one slot, and the first additional pattern in the later part in time in the same slot and DMRS according to the second additional pattern may be mapped.

DMRS pattern example basic pattern
(in front of the slot) first additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 51 4-1 does not exist does not exist 52 4-2 does not exist does not exist 53 4-1 4-1 does not exist 54 4-1 4-2 does not exist 55 4-2 4-1 does not exist 56 4-2 4-2 does not exist 57 4-1 4-1 4-1 58 4-1 4-1 4-2 59 4-1 4-2 4-1 60 4-1 4-2 4-2 61 4-2 4-1 4-1 62 4-2 4-1 4-2 63 4-2 4-2 4-1 64 4-2 4-2 4-2

6(f) and 6(g) correspond to DMRS pattern Examples 61 and 64 of Table 13, respectively. In the examples of FIGS. 7 to 10 described below, as in the examples of FIGS. 2 and 3, 4 DMRS antenna ports are mapped to one CDM group, and a total of 3 CDM groups for a total of 12 DMRS antenna ports. can be configured.

7 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 7 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 2(a). That is, in the DMRS pattern of FIG. 7 , the CDM group #A may be mapped to the first symbol, the CDM group #B may be mapped to the second symbol, and the CDM group #C may be mapped to the third symbol.

First, an OCC mapping method will be described with reference to FIG. 7( a ).

As shown in FIG. 7( a ), in all cases, for 4 REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (eg, having the lowest subcarrier index) RE) applies a as an OCC value, and applies b as an OCC value to the second RE (eg, the RE having the second lowest subcarrier index), and applies b as the OCC value to the third RE (eg, the third RE) C may be applied as an OCC value to an RE having a low subcarrier index, and d may be applied as an OCC value to a fourth RE (eg, RE having the highest subcarrier index).

OCC values a, b, c, and d may be given as shown in Table 14 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group 3rd antenna port
in each CDM group 4th antenna port
in each CDM group a +1 +1 +1 +1 b +1 -One +1 -One c +1 +1 -One -One d +1 -One -One +1

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1, +1, +1, +1 are applied over 4 REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied over 4 REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 over 4 REs in the frequency direction , +1, -1, -1 OCC is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied over 4 REs in the frequency direction. Each CDM group is repeated 1 time (Fig. 7(b)), 2 repetitions (Fig. 7(c)), or 3 repetitions (Fig. 7(d)) within one PRB on the frequency axis. can be configured.

If the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 7(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 1 RE. can

In FIG. 7(b), each CDM group applies a CDM (ie, CDM4) by OCC of length-4 on the frequency axis for four consecutive or discontinuous REs on the frequency axis within one symbol, and this It only shows an example of repeating once in one PRB on the frequency axis (that is, using four REs for four DMRS antenna ports in one PRB), in the slot for the DMRS REs of FIG. The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice within one PRB as in the example of FIG. 7(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 8 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 2 REs. can

In FIG. 7(c), each CDM group applies a CDM (ie, CDM4) by OCC of length-4 on the frequency axis to four consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating twice in one PRB on the frequency axis (ie, using 8 REs for 4 DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 7(c) The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

As in the example of FIG. 7(d), if the DMRS mapping pattern is repeated three times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 REs per port (ie, 3REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 12 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 3 REs. can

In FIG. 7(d), each CDM group applies a CDM (ie, CDM2) by OCC of length-4 on the frequency axis to four consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating 3 times in one PRB on the frequency axis (that is, using 12 REs for 4 DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 7(d) The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to a rear part of a slot in consideration of a high Doppler scenario by using the basic pattern shown in FIGS. 7(b) to 7(d).

Specifically, in Figs. 7(b) to 7(d), the DMRS is mapped pattern (as in the example of Fig. 2(a) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 5-1, 5-2, and 5-3, respectively. Based on this, as shown in Table 15 below, the DMRS according to the basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a later temporally in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 65 5-1 does not exist 66 5-2 does not exist 67 5-3 does not exist 68 5-1 5-1 69 5-1 5-2 70 5-1 5-3 71 5-2 5-1 72 5-2 5-2 73 5-2 5-3 74 5-3 5-1 75 5-3 5-2 76 5-3 5-3

Examples of FIGS. 7(e) and 7(f) correspond to DMRS pattern Examples 74 and 76 of Table 15, respectively. 8 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 8 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 2(b). That is, in the DMRS pattern of FIG. 8 , CDM groups #A, #B, and #C divided by FDM method may be mapped to the first symbol by default. Alternatively, in the DMRS pattern of FIG. 8, by default, CDM groups #A, #B, and #C divided by FDM method are mapped to the first symbol, and CDM group #A divided by FDM method to the second symbol as well, #B and #C may be mapped. As such, each CDM group may be mapped to only the first symbol or to both the first symbol and the second symbol according to overhead.

As an additional example, CDM group #A may be mapped to the first symbol, and CDM group #C may be mapped to the second symbol. CDM group #B may be mapped to only the first symbol or to both the first symbol and the second symbol according to overhead.

First, an OCC mapping method will be described with reference to FIG. 8(a).

As shown in FIG. 8( a ), in all cases, for 4 REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (eg, having the lowest subcarrier index) RE) applies a as an OCC value, and applies b as an OCC value to the second RE (eg, the RE having the second lowest subcarrier index), and applies b as the OCC value to the third RE (eg, the third RE) C may be applied as an OCC value to an RE having a low subcarrier index, and d may be applied as an OCC value to a fourth RE (eg, RE having the highest subcarrier index).

OCC values a, b, c and d may be given as shown in Table 16 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group 3rd antenna port
in each CDM group 4th antenna port
in each CDM group a +1 +1 +1 +1 b +1 -One +1 -One c +1 +1 -One -One d +1 -One -One +1

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1, +1, +1, and +1 are applied over 4 REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied over 4 REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 over 4 REs in the frequency direction , +1, -1, -1 OCC is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied over 4 REs in the frequency direction. Each CDM group may be configured by repeating once (FIG. 8(b)) or repeating twice (FIG. 8(c)) in one PRB on the frequency axis.

If the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 8(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 1 RE. can

In FIG. 8(b), each CDM group applies a CDM (ie, CDM4) by OCC of length-4 on the frequency axis to four consecutive or discontinuous REs on the frequency axis within one symbol, and this It only shows an example of repeating once in one PRB on the frequency axis (that is, using four REs for four DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 8(b). The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

When the DMRS mapping pattern is repeated twice within one PRB as in the example of FIG. 8(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 8 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 2 REs. can

In FIG. 8(c), each CDM group applies a CDM (ie, CDM4) by OCC of length-4 on the frequency axis to four consecutive or discontinuous REs on the frequency axis within one symbol, and this Only shows an example of repeating twice in one PRB on the frequency axis (that is, using 8 REs for 4 DMRS antenna ports in one PRB), in the slot for DMRS REs of FIG. 8(c) The specific symbol index and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario using the basic pattern shown in FIGS. 8(b) and 8(c).

Specifically, in Figs. 8(b) and 8(c), the DMRS is mapped pattern (as in the example of Fig. 2(b) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency ) can be defined as patterns 6-1 and 6-2, respectively. Based on this, as shown in Table 17 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a temporally later part in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 77 6-1 does not exist 78 6-2 does not exist 79 6-1 6-1 80 6-1 6-2 81 6-2 6-1 82 6-2 6-2

Examples of FIGS. 8(d) and 8(e) correspond to DMRS pattern Examples 81 and 82 of Table 17, respectively. As an additional example, based on the patterns 6-1 and 6-2, as shown in Table 18 below, the DMRS according to the basic pattern is mapped in the front part in time in one slot, and the first additional pattern in the later part in time in the same slot and DMRS according to the second additional pattern may be mapped.

DMRS pattern example basic pattern
(in front of the slot) first additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 83 6-1 does not exist does not exist 84 6-2 does not exist does not exist 85 6-1 6-1 does not exist 86 6-1 6-2 does not exist 87 6-2 6-1 does not exist 88 6-2 6-2 does not exist 89 6-1 6-1 6-1 90 6-1 6-1 6-2 91 6-1 6-2 6-1 92 6-1 6-2 6-2 93 6-2 6-1 6-1 94 6-2 6-1 6-2 95 6-2 6-2 6-1 96 6-2 6-2 6-2

Examples of FIGS. 8(f) and 8(g) correspond to DMRS pattern Examples 93 and 96 of Table 18, respectively. 9 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 9 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 2( c ). That is, in the DMRS pattern of FIG. 9, by default, CDM groups #A and #B, which are distinguished from each other by FDM method, are mapped to the first and second symbols, and CDM group #C can be mapped to the third and fourth symbols. there is.

First, an OCC mapping method will be described with reference to FIG. 9( a ).

As shown in OCC mapping schemes A, B, C and D of FIG. 9( a ), for a total of 4 REs on the time axis and frequency axis within two symbols to which each CDM group is mapped, case #1 The mapping method and the mapping method of Case #2 may be alternately applied in the frequency direction. The OCC mapping in the first symbol in case #1 is the same as the OCC mapping in the second symbol in case #2, and the OCC mapping in the second symbol in case #1 is the OCC mapping in the first symbol in case #2. It may be the same as OCC mapping.

Since case #1 and case #2 are alternately applied in the frequency direction in this way, power balance when only the same OCC values (eg, a and b) are mapped on one symbol may become a problem, This is so that a and b and c and d, which are different OCC values, are alternately mapped to one symbol.

For example, if a CDM group is repeated C times on the frequency axis for two symbols to which each CDM group is mapped, if the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the repetition index, and case #2 may be applied in the odd-numbered repetition index.

If the difference between OCC mapping methods A, B, C, and D is described based on Case #1, OCC mapping method A is filled by first mapping OCC values a and b in the time axis direction, then from frequency resources to the time axis direction. This is a method of mapping OCC values c and d, and OCC mapping method B is a method of mapping OCC values a and b first in the frequency axis direction and filling, then mapping OCC values c and d in the frequency axis direction in the time resource, and , OCC mapping method C is a method of mapping OCC values a, b, c, d in a clockwise direction starting from the time and frequency resource having the lowest index value, and OCC mapping method D is the time and frequency resource having the lowest index value; It is a method of mapping OCC values a, b, c, and d in a counterclockwise direction starting from a frequency resource.

OCC values a, b, c and d may be given as shown in Table 19 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group 3rd antenna port
in each CDM group 4th antenna port
in each CDM group a +1 +1 +1 +1 b +1 -One +1 -One c +1 +1 -One -One d +1 -One -One +1

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1, +1, +1, and +1 are applied over 4 REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied over 4 REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 over 4 REs in the frequency direction , +1, -1, -1 OCC is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied over 4 REs in the frequency direction. Each CDM group is repeated 1 time (FIG. 9(b)), 2 repetitions (FIG. 9(c)), or 3 repetitions (FIG. 9(d)) within one PRB on the frequency axis. can be configured.

If the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 9(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 1 RE. can

In FIG. 9(b), each CDM group has a length in the time axis and frequency axis for a total of four REs on two consecutive or discontinuous subcarriers per one symbol within two consecutive or discontinuous symbols - Applying CDM (ie, CDM4) by OCC of 4, and this is repeated once in one PRB on the frequency axis (ie, using 4 REs for 4 DMRS antenna ports in one PRB). However, the specific symbol index in the slot for the DMRS REs of FIG. 9(b) and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position or a position signaled by the base station.

As in the example of FIG. 9(c), if the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and since one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 2 REs. can

In FIG. 9( c ), each CDM group has a length in the time axis and frequency axis for a total of four REs on two consecutive or discontinuous subcarriers per one symbol within two consecutive or discontinuous symbols - Applying CDM (ie, CDM4) by OCC of 4, and this is repeated twice in one PRB on the frequency axis (ie, using 8 REs for 4 DMRS antenna ports in one PRB). However, the specific symbol index in the slot for the DMRS REs of FIG. 9(c) and the position of the subcarrier in the PRB are not limited, and may be determined by a fixed position or a position signaled by the base station.

As in the example of FIG. 9(d), if the DMRS mapping pattern is repeated 3 times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 REs per port (ie, 3REs per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 12 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 3 REs. can

In FIG. 9( d ), each CDM group has an OCC of length-4 on the time axis for a total of 4 REs on two consecutive or discontinuous subcarriers per one symbol within two consecutive or discontinuous symbols. Applying the CDM (i.e., CDM4) by , this only shows an example of repeating 3 times in one PRB in the frequency axis (i.e., using 12 REs for 4 DMRS antenna ports in one PRB), FIG. The specific symbol index in the slot for DMRS REs of 9(d) and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to a rear part of a slot in consideration of a high Doppler scenario by using the basic pattern shown in FIGS. 9(b) to 9(d).

Specifically, in FIGS. 9(b) to 9(d), the DMRS is mapped pattern (as in the example of FIG. 2(c) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 7-1, 7-2, and 7-3, respectively. Based on this, as shown in Table 20 below, a DMRS according to a basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a temporally later part in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 97 7-1 does not exist 98 7-2 does not exist 99 7-3 does not exist 100 7-1 7-1 101 7-1 7-2 102 7-1 7-3 103 7-2 7-1 104 7-2 7-2 105 7-2 7-3 106 7-3 7-1 107 7-3 7-2 108 7-3 7-3

Examples of FIGS. 9(e) and 9(f) correspond to DMRS pattern Examples 106 and 108 of Table 20, respectively. 10 is a diagram illustrating an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 10 may correspond to specific examples similar to the DMRS pattern as shown in FIG. 2(d). That is, in the DMRS pattern of FIG. 10 , CDM groups #A, #B, and #C divided by FDM method may be mapped to the first and second symbols by default.

First, an OCC mapping method will be described with reference to FIG. 10( a ).

As shown in OCC mapping schemes A, B, C and D of FIG. 10( a ), for a total of 4 REs on the time axis and the frequency axis within two symbols to which each CDM group is mapped, case #1 The mapping method and the mapping method of Case #2 may be alternately applied in the frequency direction. The OCC mapping in the first symbol in case #1 is the same as the OCC mapping in the second symbol in case #2, and the OCC mapping in the second symbol in case #1 is the OCC mapping in the first symbol in case #2. It may be the same as OCC mapping.

Since case #1 and case #2 are alternately applied in the frequency direction in this way, power balance when only the same OCC values (eg, a and b) are mapped on one symbol may become a problem, This is so that a and b and c and d, which are different OCC values, are alternately mapped to one symbol.

For example, if a CDM group is repeated C times on the frequency axis for two symbols to which each CDM group is mapped, if the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the repetition index, and case #2 may be applied in the odd-numbered repetition index.

If the difference between OCC mapping methods A, B, C, and D is described based on Case #1, OCC mapping method A is filled by first mapping OCC values a and b in the time axis direction, then from frequency resources to the time axis direction. This is a method of mapping OCC values c and d, and OCC mapping method B is a method of mapping OCC values a and b first in the frequency axis direction and filling, then mapping OCC values c and d in the frequency axis direction in the time resource, and , OCC mapping method C is a method of mapping OCC values a, b, c, d in a clockwise direction starting from the time and frequency resource having the lowest index value, and OCC mapping method D is the time and frequency resource having the lowest index value; It is a method of mapping OCC values a, b, c, and d in a counterclockwise direction starting from a frequency resource.

OCC values a, b, c and d may be given as shown in Table 21 below.

OCC value 1st antenna port
in each CDM group 2nd antenna port
in each CDM group 3rd antenna port
in each CDM group 4th antenna port
in each CDM group a +1 +1 +1 +1 b +1 -One +1 -One c +1 +1 -One -One d +1 -One -One +1

For example, for DMRS antenna port #1 of CDM group #A, OCCs of +1, +1, +1, and +1 are applied over 4 REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied over 4 REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 over 4 REs in the frequency direction , +1, -1, -1 OCC is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied over 4 REs in the frequency direction. Each CDM group may be configured by repeating once (FIG. 10(b)) or repeating twice (FIG. 10(c)) in one PRB on the frequency axis.

If the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. 10(b), it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (ie, 1RE per 1port and 1PRB). there is. That is, since one CDM group is mapped to a total of 4 REs in one PRB, and one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 1 RE. can

In FIG. 10( b ), each CDM group has an OCC of length-4 on the time axis for a total of 4 REs on two consecutive or discontinuous subcarriers per one symbol within two consecutive or discontinuous symbols. Applying the CDM (ie, CDM4) by , and this only shows an example of repeating 1 time in one PRB (ie, using 4 REs for 4 DMRS antenna ports in one PRB) in the frequency axis, FIG. The specific symbol index in the slot for DMRS REs of 10(b) and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice in one PRB as in the example of FIG. 10(c), it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (ie, 2REs per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and since one CDM group includes 4 DMRS antenna ports, one DMRS antenna port can be expressed as having an overhead of 2 REs. can

In FIG. 10( c ), each CDM group has an OCC of length-4 on the time axis for a total of 4 REs on two consecutive or discontinuous subcarriers per one symbol within two consecutive or discontinuous symbols. Applying the CDM (that is, CDM4) by , and this only shows an example of repeating twice in one PRB in the frequency axis (that is, using 8 REs for 4 DMRS antenna ports in one PRB), FIG. The specific symbol index in the slot for DMRS REs of 10(c) and the position of the subcarrier in the PRB are not limited, and may be determined as a predetermined position or a position signaled by the base station.

An additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario using the basic pattern shown in FIGS. 10(b) and 10(c).

Specifically, in FIGS. 10 (b) and 10 (c), the DMRS is mapped pattern (as in the example of FIG. 2 (d) , except for the specific symbol index and subcarrier index, the relative positions of REs to which the DMRS is mapped on time/frequency can be defined as patterns 8-1 and 8-2, respectively. Based on this, as shown in Table 22 below, the DMRS according to the basic pattern may be mapped to a temporally earlier part in one slot, and a DMRS according to an additional pattern may be mapped to a later temporally in the same slot.

DMRS pattern example basic pattern
(in front of the slot) additional pattern
(behind the slot) 109 8-1 does not exist 110 8-2 does not exist 111 8-1 8-1 112 8-1 8-2 113 8-2 8-1 114 8-2 8-2

Examples of FIGS. 10(d) and 10(e) correspond to DMRS pattern Examples 113 and 114 of Table 22, respectively. As an additional example, based on the patterns 8-1 and 8-2, as shown in Table 23 below, the DMRS according to the basic pattern is mapped in the front part in time in one slot, and the first additional pattern in the later part in time in the same slot and DMRS according to the second additional pattern may be mapped.

DMRS Pattern Example basic pattern
(in front of the slot) first additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 115 8-1 does not exist does not exist 116 8-2 does not exist does not exist 117 8-1 8-1 does not exist 118 8-1 8-2 does not exist 119 8-2 8-1 does not exist 120 8-2 8-2 does not exist 121 8-1 8-1 8-1 122 8-1 8-1 8-2 123 8-1 8-2 8-1 124 8-1 8-2 8-2 125 8-2 8-1 8-1 126 8-2 8-1 8-2 127 8-2 8-2 8-1 128 8-2 8-2 8-2

Examples of FIGS. 10(f) and 10(g) correspond to DMRS pattern examples 125 and 128 of Table 23, respectively. In the examples of the above-mentioned DMRS pattern, when a maximum of 12 DMRS antenna ports are divided into a maximum of 6 or 3 CDM groups, and the DMRS antenna port overhead is 1 PRB and 1 RE per port, 1 PRB and 1 port In the case of 2RE per 1 PRB and 3RE per port, the DMRS pattern may be determined. In addition, an additional pattern may be applied within one slot.

Hereinafter, examples of the present disclosure for a method for indicating a DMRS pattern, that is, a method for the base station to signal configuration information for the DMRS pattern to the terminal, will be described.

First, factors to be considered for DMRS pattern indication are: i) basic pattern overhead (including presence or absence of basic pattern), ii) additional pattern overhead (including presence or absence of additional pattern), iii) RE position in slot of basic pattern (ie, symbol location and/or subcarrier location), iv) RE location within the slot of the additional pattern (ie symbol location and/or subcarrier location), v) virtual cell identifier.

First, i) a basic pattern overhead signaling scheme will be described.

DMRS may be transmitted together in a slot in which a physical channel requiring demodulation is transmitted, but if DMRS bundling is applied in the time domain, a certain slot is a slot in which a physical channel is transmitted, but a DMRS basic pattern may not exist. there is. DMRS bundling may be referred to as demodulating a physical channel in the plurality of slots based on channel information estimated using DMRS transmitted in one of the plurality of slots.

For example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS basic pattern may be signaled using 1-bit information. For example, two cases may be indicated: a case in which the DMRS basic pattern does not exist, or a case in which the DMRS basic pattern has the maximum overhead if it exists. For example, when the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (ie, DMRS does not exist in the corresponding slot). When the bit value is 1, it may indicate that the basic pattern DMRS overhead is 3 (ie, the CDM group of the basic pattern is repeated 3 times in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS basic pattern may be signaled using 1-bit information. For example, two cases may be indicated: a case in which the DMRS basic pattern does not exist, or a case in which the DMRS basic pattern has the maximum overhead if it exists. For example, when the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (ie, DMRS does not exist in the corresponding slot). When the bit value is 1, it may indicate that the basic pattern DMRS overhead is 2 (ie, the CDM group of the basic pattern is repeated twice in one PRB).

As another example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS basic pattern may be signaled using 2-bit information. For example, it may indicate that the DMRS basic pattern does not exist, or a specific value of the DMRS overhead. For example, when the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (ie, DMRS does not exist in the corresponding slot). When the bit value is 1, it may indicate that the basic pattern DMRS overhead is 1 (ie, the CDM group of the basic pattern is repeated once in one PRB). When the bit value is 2, it may indicate that the basic pattern DMRS overhead is 2 (that is, the CDM group of the basic pattern is repeated twice in one PRB). When the bit value is 3, it may indicate that the basic pattern DMRS overhead is 3 (that is, the CDM group of the basic pattern is repeated 3 times in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS basic pattern may be signaled using 2-bit information. For example, it may indicate that the DMRS basic pattern does not exist, or a specific value of the DMRS overhead. For example, when the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (ie, DMRS does not exist in the corresponding slot). When the bit value is 1, it may indicate that the basic pattern DMRS overhead is 1 (ie, the CDM group of the basic pattern is repeated once in one PRB). When the bit value is 2, it may indicate that the basic pattern DMRS overhead is 2 (that is, the CDM group of the basic pattern is repeated twice in one PRB). Bit value 3 may be reserved.

Next, ii) an additional pattern overhead signaling scheme will be described.

If the DMRS basic pattern does not exist in any slot, the additional pattern may not exist either. In addition, when a high Doppler scenario is not considered, an additional pattern may not exist in a slot in which the DMRS basic pattern exists.

For example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases may be indicated: a case in which the DMRS addition pattern does not exist or a case in which the DMRS addition pattern is present has the maximum overhead. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS additional pattern does not exist in the corresponding slot). When the bit value is 1, it may indicate that the additional pattern DMRS overhead is 3 (that is, the CDM group of the additional pattern is repeated 3 times in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases may be indicated: a case in which the DMRS addition pattern does not exist or a case in which the DMRS addition pattern is present has the maximum overhead. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS first additional pattern and the second additional pattern do not exist in the corresponding slot). . When the bit value is 1, the first additional pattern DMRS overhead is 2 (that is, the CDM group of the first additional pattern is repeated twice in one PRB), and the second additional pattern DMRS overhead is 2 ( That is, it may indicate that the CDM group of the second additional pattern is repeated twice in one PRB).

As another example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS addition pattern may be signaled using 2-bit information. For example, it may indicate that the DMRS addition pattern does not exist, or a specific value of the overhead of the DMRS addition pattern. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS additional pattern does not exist in the corresponding slot). When the bit value is 1, it may indicate that the additional pattern DMRS overhead is 1 (ie, the CDM group of the additional pattern is repeated once in one PRB). When the bit value is 2, it may indicate that the additional pattern DMRS overhead is 2 (ie, the CDM group of the additional pattern is repeated twice in one PRB). When the bit value is 3, it may indicate that the additional pattern DMRS overhead is 3 (ie, the CDM group of the additional pattern is repeated 3 times in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS addition pattern may be signaled using 3-bit information. For example, it may indicate that the DMRS addition pattern does not exist, or a specific value of the overhead of the DMRS addition pattern. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, both the DMRS first additional pattern and the second additional pattern do not exist in the corresponding slot). there is. If the bit value is 1, the first additional pattern DMRS overhead is 1 (that is, the CDM group of the first additional pattern is repeated once in one PRB), and the second additional pattern DMRS overhead is 0 ( That is, it may indicate that the DMRS second additional pattern does not exist in the corresponding slot). If the bit value is 2, the first additional pattern DMRS overhead is 2 (that is, the CDM group of the first additional pattern is repeated twice in one PRB), and the second additional pattern DMRS overhead is 0 ( That is, it may indicate that the DMRS second additional pattern does not exist in the corresponding slot). If the bit value is 3, the first additional pattern DMRS overhead is 1 (that is, the CDM group of the first additional pattern is repeated once in one PRB), and the second additional pattern DMRS overhead is 1 ( That is, it may indicate that the CDM group of the second additional pattern is repeated once in one PRB). If the bit value is 4, the first additional pattern DMRS overhead is 2 (that is, the CDM group of the first additional pattern is repeated twice in one PRB), and the second additional pattern DMRS overhead is 1 ( That is, it may indicate that the CDM group of the second additional pattern is repeated once in one PRB). If the bit value is 5, the first additional pattern DMRS overhead is 2 (that is, the CDM group of the first additional pattern is repeated twice in one PRB), and the second additional pattern DMRS overhead is 2 ( That is, it may indicate that the CDM group of the second additional pattern is repeated twice in one PRB). Bit values 6 and 7 may be reserved.

The above example assumes that the overhead of the second additional pattern is set to be less than or equal to the overhead of the first additional pattern (that is, the overhead of the second additional pattern is not greater than the overhead of the first additional pattern). will be. If it is assumed that the overhead of the second additional pattern is always 0, only bit values 0, 1, and 2 may indicate the overhead of the first additional pattern.

As another example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases of a case in which a DMRS addition pattern does not exist or a case in which a specific overhead is not the maximum if a DMRS addition pattern is present may be indicated. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS additional pattern does not exist in the corresponding slot). When the bit value is 1, it may indicate that the additional pattern DMRS overhead is 2 (ie, the CDM group of the additional pattern is repeated twice in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases of a case in which a DMRS addition pattern does not exist or a case in which a specific overhead is not the maximum if a DMRS addition pattern is present may be indicated. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS first additional pattern and the second additional pattern do not exist in the corresponding slot). . If the bit value is 1, the first additional pattern DMRS overhead is 1 (that is, the CDM group of the first additional pattern is repeated once in one PRB), and the second additional pattern DMRS overhead is 1 ( That is, it may indicate that the CDM group of the second additional pattern is repeated once in one PRB).

As another example, based on the examples shown in FIGS. 3, 5, 7, and 9, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases of a case in which a DMRS addition pattern does not exist or a case in which a specific overhead is not the maximum if a DMRS addition pattern is present may be indicated. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS additional pattern does not exist in the corresponding slot). When the bit value is 1, it may indicate that the additional pattern DMRS overhead is 1 (ie, the CDM group of the additional pattern is repeated once in one PRB).

As an additional example, based on the examples shown in FIGS. 4, 6, 8, and 10, the overhead of the DMRS addition pattern may be signaled using 1-bit information. For example, two cases of a case in which a DMRS addition pattern does not exist or a case in which a specific overhead is not the maximum if a DMRS addition pattern is present may be indicated. For example, when the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (that is, the DMRS first additional pattern and the second additional pattern do not exist in the corresponding slot). . If the bit value is 1, the first additional pattern DMRS overhead is 1 (that is, the CDM group of the first additional pattern is repeated once in one PRB), and the second additional pattern DMRS overhead is 0 ( That is, it may indicate that the second additional pattern does not exist).

Next, a method for signaling iii) an RE position (ie, a symbol position and/or a subcarrier position) in a slot of a basic pattern will be described.

In order to signal the RE position of the basic pattern, the position of the control region in the slot (ie, the RE position to which the control channel is mapped), the overhead of the DMRS basic pattern, and the position of the data region in the slot (ie, the RE to which the data channel is mapped) location) and the like, candidate locations to which the DMRS basic pattern can be mapped may be determined. It may signal which position is used among these candidate positions. If the number of candidate positions is only one, the UE can know the RE position of the basic pattern even if it is not signaled. The RE position of this basic pattern may be indicated based on a symbol index value and/or a subcarrier index value.

Next, a method for signaling iv) an RE position (ie, a symbol position and/or a subcarrier position) within a slot of an additional pattern will be described.

In order to signal the RE position of the additional pattern, the position of the DMRS basic pattern, the overhead of the additional pattern, the data region position (eg, downlink data channel transmission period and position in TDD (Time Division Duplex) setting), etc. In consideration of , candidate positions to which the DMRS addition pattern can be mapped may be determined. It may signal which position is used among these candidate positions. If the number of candidate positions is only one, the UE can know the RE position of the basic pattern even if it is not signaled. The RE position of the basic pattern may be indicated based on a symbol index value and/or a subcarrier index value, or may be defined as a value relative to the position of the basic pattern.

Next, v) a virtual cell identifier signaling method will be described.

A virtual cell ID (VCID) may be configured for cooperative transmission (eg, Coordinated Multi-Point (CoMP) transmission) with another cell, unlike a physical layer ID (Physical ID) of the cell. . Two or three or more of these VCIDs may be set. For example, VCID for Transmission Reception Points (TRPs) that share the same cell-specific ID or group-specific ID and perform an operation based on this during CoMP operation, different cell-specific IDs even if they operate as CoMP or do not operate Alternatively, a VCID for TRPs performing an operation based on a group-specific ID, etc. may be configured. In this case, the base station may inform the terminal of the VCID value to be used for DMRS reception (that is, to be used as an initial value of DMRS sequence generation, etc.). In addition, VCID is not a factor directly related to DMRS pattern setting, but since the values of DMRS pattern setting elements such as i) to iv) may be set based on the VCID (DMRS pattern setting is a MU-MIMO environment for each terminal (since the same VCID can be configured between terminals operating in MU-MIMO), the VCID can be said to be a factor indirectly related to DMRS pattern setting.

Hereinafter, a signaling method of DMRS pattern configuration information will be described.

* As an example of a signaling scheme, elements of DMRS configuration information such as i) to v) described above may be individually or independently signaled.

For example, i) may be dynamically indicated by explicitly or implicitly including configuration information on the basic pattern overhead (including whether or not the basic pattern exists) in the downlink control information (DCI) or the like. Or, i) semi-static (semi-static) by explicitly or implicitly including configuration information for the basic pattern overhead (including the presence or absence of the basic pattern) in higher layer signaling (eg, RRC (Radio Resource Control) layer signaling, etc.) -static) can also be specified.

For example, ii) configuration information for additional pattern overhead (including presence or absence of additional patterns) may be explicitly or implicitly included in DCI to indicate dynamically. Alternatively, ii) configuration information for additional pattern overhead (including presence or absence of additional patterns) may be explicitly or implicitly included in higher layer signaling (eg, RRC signaling, etc.) to indicate semi-statically.

For example, iii) the RE position (ie, symbol position and/or subcarrier position) in the slot of the basic pattern may not be separately signaled by using a predefined fixed value. Alternatively, iii) configuration information for the RE position (ie, symbol position and/or subcarrier position) in the slot of the basic pattern may be explicitly or implicitly included in DCI to indicate dynamically. Or, iii) configuration information for the RE position (ie, symbol position and/or subcarrier position) in the slot of the basic pattern is explicitly or implicitly included in higher layer signaling (eg, RRC signaling, etc.) It can also be directed statically.

For example, iv) the RE position (ie, the symbol position and/or the subcarrier position) in the slot of the additional pattern may not be signaled separately because a predefined fixed value is used. Alternatively, iv) may be dynamically indicated by explicitly or implicitly including configuration information for the RE position (ie, symbol position and/or subcarrier position) in the slot of the additional pattern in DCI. Or, iv) configuration information for RE position (ie, symbol position and / or subcarrier position) in the slot of the additional pattern is explicitly or implicitly included in higher layer signaling (eg, RRC signaling, etc.) - It can also be directed statically.

For example, v) configuration information for a virtual cell identifier (VCID) may be explicitly or implicitly included in DCI to indicate dynamically. Alternatively, v) configuration information for a virtual cell identifier (VCID) may be explicitly or implicitly included in higher layer signaling (eg, RRC signaling, etc.) to indicate semi-statically.

In the above examples, when the DMRS pattern configuration information is signaled using DCI, etc., it can be dynamically indicated immediately if necessary, but changing or increasing the amount of information included in DCI may reduce overall system performance. there is. Alternatively, in the case of signaling DMRS pattern configuration information using RRC signaling, etc., even if the amount of information included in RRC signaling increases, there is no major problem such as degradation of system performance, but signaling may not be possible immediately if necessary.

As an additional example of the signaling scheme, two or more of the elements of DMRS configuration information such as i) to v) described above may be jointly encoded and signaled. That is, signaling set candidates in consideration of two or more of the elements of DMRS configuration information may be configured through higher layer signaling, and any one of the signaling set candidates may be indicated through DCI.

A method of semi-statically configuring signaling set candidates through higher layer signaling may be as described for each of the elements of DMRS configuration information such as i) to v).

In addition, any one of the plurality of signaling set candidates may be dynamically indicated through a 1-bit or 2-bit indicator included in DCI.

Also, for elements not included in the signaling set candidates among the elements of DMRS configuration information such as i) to v), the method of individually or independently signaling as in the above-described example may be applied.

Example 1

This embodiment is a method of setting signaling set candidates including elements of i) basic pattern overhead (including presence or absence of basic pattern), ii) additional pattern overhead (including presence or absence of additional pattern), and v) virtual cell identifier, Any one of the candidates may be dynamically indicated by using 1-bit or 2-bit information included in DCI.

Table 24 below shows an example of dynamically indicating DMRS pattern configuration information using 1-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C 0
(RRC set candidate #1) Basic DMRS pattern
Overhead #1 Additional DMRS patterns
Overhead #1 VCID #1 One
(RRC set candidate #2) Basic DMRS pattern
Overhead #2 Additional DMRS patterns
Overhead #2 VCID #2

In the example of Table 24, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values may be set for the basic DMRS pattern overhead #1 and the basic DMRS pattern overhead #2, or the same value may be set. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values of the additional DMRS pattern overhead #1 and the additional DMRS pattern overhead #2 may be set, or the same value may be set.

As described in v) virtual cell identifier signaling method described above, VCID #1 and VCID #2 may be configured through RRC signaling, respectively. VCID #1 and VCID #2 may be set to different values or may be set to the same value.

Table 25 below shows an example of dynamically indicating DMRS pattern configuration information using 2-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C 0
(RRC set candidate #1) Basic DMRS pattern
Overhead #1 Additional DMRS patterns
Overhead #1 VCID #1 One
(RRC set candidate #2) Basic DMRS pattern
Overhead #2 Additional DMRS patterns
Overhead #2 VCID #2 2
(RRC set candidate #3) Basic DMRS pattern
Overhead #3 Additional DMRS patterns
Overhead #3 VCID #3 3
(RRC set candidate #4) Basic DMRS pattern
Overhead #4 Additional DMRS patterns
Overhead #4 VCID #4

In the example of Table 25, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in v) virtual cell identifier signaling method described above, VCIDs #1, #2, #3, and #4 may be configured through RRC signaling, respectively. VCIDs #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

iii) an RE position (ie, a symbol position and/or a subcarrier position) in a slot of the base pattern, and iv) an RE position in a slot of an additional pattern (ie, a symbol position and/or a sub each of the carrier positions) may be individually or independently configured through DCI or RRC signaling.

Example 2

This embodiment is a method of setting signaling set candidates including elements of i) basic pattern overhead (including presence or absence of basic pattern), and ii) additional pattern overhead (including presence or absence of additional pattern), and any one of the candidates is DCI It can be dynamically indicated using 1-bit or 2-bit size information included in .

Table 26 below shows an example of dynamically indicating DMRS pattern configuration information using 1-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B 0
(RRC set candidate #1) Basic DMRS pattern
Overhead #1 Additional DMRS patterns
Overhead #1 One
(RRC set candidate #2) Basic DMRS pattern
Overhead #2 Additional DMRS patterns
Overhead #2

In the example of Table 26, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values may be set for the basic DMRS pattern overhead #1 and the basic DMRS pattern overhead #2, or the same value may be set. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values of the additional DMRS pattern overhead #1 and the additional DMRS pattern overhead #2 may be set, or the same value may be set.

Table 27 below shows an example of dynamically indicating DMRS pattern configuration information using 2-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B 0
(RRC set candidate #1) Basic DMRS pattern
Overhead #1 Additional DMRS patterns
Overhead #1 One
(RRC set candidate #2) Basic DMRS pattern
Overhead #2 Additional DMRS patterns
Overhead #2 2
(RRC set candidate #3) Basic DMRS pattern
Overhead #3 Additional DMRS patterns
Overhead #3 3
(RRC set candidate #4) Basic DMRS pattern
Overhead #4 Additional DMRS patterns
Overhead #4

In the example of Table 27, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

iii) RE position in the slot of the base pattern (ie, symbol position and/or subcarrier position), iv) RE position in the slot of the additional pattern (ie, symbol position and/or subcarrier) that is not included in the higher layer signaling set candidates location), and v) each of the virtual cell identifiers may be individually or independently configured through DCI or RRC signaling.

Example 3

This embodiment includes i) basic pattern overhead (with and without basic pattern), ii) additional pattern overhead (with or without additional pattern), iii) RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position) ), iv) an RE position (ie, a symbol position and/or a subcarrier position) in a slot of an additional pattern, and v) a method of setting signaling set candidates including elements of a virtual cell identifier, and any one of the candidates is DCI It can be dynamically indicated by using 1-bit or 2-bit size information included in .

Table 28 below shows an example of dynamically indicating DMRS pattern configuration information using 1-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C RRC
parameter #D RRC
parameter #E 0
(RRC set candidate #1) basic
DMRS pattern
Overhead #1 Add
DMRS pattern
Overhead #1 VCID #1 basic
DMRS pattern
Position #1 Add
DMRS pattern
Position #1 One
(RRC set candidate #2) basic
DMRS pattern
Overhead #2 Add
DMRS pattern
Overhead #2 VCID #2 basic
DMRS pattern
Position #2 Add
DMRS pattern
Position #2

In the example of Table 28, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values may be set for the basic DMRS pattern overhead #1 and the basic DMRS pattern overhead #2, or the same value may be set. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values of the additional DMRS pattern overhead #1 and the additional DMRS pattern overhead #2 may be set, or the same value may be set.

As described in the above-mentioned iii) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the basic pattern, the basic DMRS pattern position #1 and the basic DMRS pattern position #2 are set through RRC signaling, respectively. The basic DMRS pattern position #1 and the basic DMRS pattern position #2 may have different values or the same value may be set.

As described in the above-described iv) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the additional pattern, the additional DMRS pattern position #1 and the additional DMRS pattern position #2 are set through RRC signaling, respectively. The additional DMRS pattern position #1 and the additional DMRS pattern position #2 may have different values or the same value may be set.

As described in v) virtual cell identifier signaling method described above, VCID #1 and VCID #2 may be configured through RRC signaling, respectively. VCID #1 and VCID #2 may have different values set or the same value may be set.

Table 29 below shows an example of dynamically indicating DMRS pattern configuration information using 2-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C RRC
parameter #D RRC
parameter #E 0
(RRC set #1) basic
DMRS pattern
Overhead #1 Add
DMRS pattern
Overhead #1 VCID #1 basic
DMRS pattern
Position #1 Add
DMRS pattern
Position #1 One
(RRC set #2) basic
DMRS pattern
Overhead #2 Add
DMRS pattern
Overhead #2 VCID #2 basic
DMRS pattern
Position #2 Add
DMRS pattern
Position #2 2
(RRC set #3) basic
DMRS pattern
Overhead #3 Add
DMRS pattern
Overhead #3 VCID #3 basic
DMRS pattern
Position #3 Add
DMRS pattern
Position #3 3
(RRC set #4) basic
DMRS pattern
Overhead #4 Add
DMRS pattern
Overhead #4 VCID #4 basic
DMRS pattern
Position #4 Add
DMRS pattern
Position #4

In the example of Table 29, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in the above-mentioned iii) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the basic pattern, the basic DMRS pattern positions #1, #2, #3, #4 each perform RRC signaling. can be set through The basic DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in the above-described iv) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the additional pattern, the additional DMRS pattern positions #1, #2, #3, #4 each perform RRC signaling. can be set through Additional DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in v) virtual cell identifier signaling method described above, VCIDs #1, #2, #3, and #4 may be configured through RRC signaling, respectively. VCIDs #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

Example 4

This embodiment includes i) basic pattern overhead (with and without basic pattern), ii) additional pattern overhead (with or without additional pattern), iii) RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position) ), and iv) a method of setting signaling set candidates including elements of RE position (ie, symbol position and/or subcarrier position) in the slot of the additional pattern, and any one of the candidates is included in DCI 1 bit or It can be dynamically indicated using 2-bit size information.

Table 30 below shows an example of dynamically indicating DMRS pattern configuration information using 1-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C RRC
parameter #D 0
(RRC set candidate #1) basic
DMRS pattern
Overhead #1 Add
DMRS pattern
Overhead #1 basic
DMRS pattern
Position #1 Add
DMRS pattern
Position #1 One
(RRC set candidate #2) basic
DMRS pattern
Overhead #2 Add
DMRS pattern
Overhead #2 basic
DMRS pattern
Position #2 Add
DMRS pattern
Position #2

In the example of Table 30, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values may be set for the basic DMRS pattern overhead #1 and the basic DMRS pattern overhead #2, or the same value may be set. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be configured through RRC signaling, respectively. Different values of the additional DMRS pattern overhead #1 and the additional DMRS pattern overhead #2 may be set, or the same value may be set.

As described in the above-mentioned iii) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the basic pattern, the basic DMRS pattern position #1 and the basic DMRS pattern position #2 are set through RRC signaling, respectively. The basic DMRS pattern position #1 and the basic DMRS pattern position #2 may have different values or the same value may be set.

As described in the above-described iv) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the additional pattern, the additional DMRS pattern position #1 and the additional DMRS pattern position #2 are set through RRC signaling, respectively. The additional DMRS pattern position #1 and the additional DMRS pattern position #2 may have different values or the same value may be set.

Table 31 below shows an example of dynamically indicating DMRS pattern configuration information using 2-bit information included in DCI.

DCI bit value RRC
parameter #A RRC
parameter #B RRC
parameter #C RRC
parameter #D 0
(RRC set #1) basic
DMRS pattern
Overhead #1 Add
DMRS pattern
Overhead #1 basic
DMRS pattern
Position #1 Add
DMRS pattern
Position #1 One
(RRC set #2) basic
DMRS pattern
Overhead #2 Add
DMRS pattern
Overhead #2 basic
DMRS pattern
Position #2 Add
DMRS pattern
Position #2 2
(RRC set #3) basic
DMRS pattern
Overhead #3 Add
DMRS pattern
Overhead #3 basic
DMRS pattern
Position #3 Add
DMRS pattern
Position #3 3
(RRC set #4) basic
DMRS pattern
Overhead #4 Add
DMRS pattern
Overhead #4 basic
DMRS pattern
Position #4 Add
DMRS pattern
Position #4

In the example of Table 31, as described in the above-described i) basic pattern overhead signaling scheme, basic DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described above in ii) additional pattern overhead signaling scheme, additional DMRS pattern overheads #1, #2, #3, and #4 may be configured through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in the above-mentioned iii) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the basic pattern, the basic DMRS pattern positions #1, #2, #3, #4 each perform RRC signaling. can be set through The basic DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

As described in the above-described iv) RE position (ie, symbol position and/or subcarrier position) signaling scheme in the slot of the additional pattern, the additional DMRS pattern positions #1, #2, #3, #4 each perform RRC signaling. can be set through Additional DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

v) Virtual cell identifiers not included in higher layer signaling set candidates may be individually or independently configured through DCI or RRC signaling.

11 is a diagram for explaining a DMRS pattern configuration information signaling method according to the present disclosure.

In step S1110, the base station may determine signaling set candidates for DMRS pattern configuration to be allocated to the terminal. One signaling set candidate is a base pattern overhead (with or without a base pattern), an additional pattern overhead (with or without an additional pattern), an RE position within a slot of the base pattern (i.e., a symbol position and/or a subcarrier position), an additional pattern It may include configuration information for a combination of two or more elements in the RE position (ie, symbol position and/or subcarrier position) in the slot of , or a virtual cell identifier.

In step S1120, the base station may inform the terminal what the DMRS pattern configuration signaling set candidates are through higher layer signaling (eg, RRC signaling).

In step S1130, the base station may determine which one of the DMRS pattern configuration signaling set candidates to be actually allocated to the terminal.

In step S1140, the base station may inform the terminal of information indicating the DMRS pattern configuration signaling set (ie, one of the candidates determined in step S1130) through dynamic signaling (eg, DCI).

In step S1150, the base station may map a DMRS on a physical resource according to a DMRS pattern corresponding to the indicated signaling set and transmit it to the terminal, and may transmit a physical channel together in a DMRS transmission slot.

In step S1160, the terminal may demodulate a signal received through a physical channel using a channel estimated based on the DMRS received from the base station.

In the example of FIG. 11 , elements not included in the DMRS pattern configuration signaling set candidates may be individually or independently configured to the UE through RRC signaling or DCI.

12 is a diagram illustrating the configuration of a base station apparatus and a terminal apparatus according to the present disclosure.

The base station device 1200 may include a processor 1210 , an antenna unit 1220 , a transceiver 1230 , and a memory 1240 .

The processor 1210 performs baseband-related signal processing and may include an upper layer processing unit 1211 and a physical layer processing unit 1215 . The upper layer processing unit 1211 may process an operation of a medium access control (MAC) layer, a radio resource control (RRC) layer, or a higher layer. The physical layer processing unit 1215 may process operations of the physical (PHY) layer (eg, uplink reception signal processing, downlink transmission signal processing). The processor 1210 may control the overall operation of the base station apparatus 1200 in addition to performing baseband-related signal processing.

The antenna unit 1220 may include one or more physical antennas, and when it includes a plurality of antennas, it may support multiple input multiple output (MIMO) transmission and reception. The transceiver 1230 may include a radio frequency (RF) transmitter and an RF receiver. The memory 1240 may store information processed by the processor 1210 , software related to the operation of the base station device 1200 , an operating system, an application, and the like, and may include components such as a buffer.

The processor 1210 of the base station apparatus 1200 may be configured to implement the base station operation in the embodiments described in the present invention.

For example, the upper layer processing unit 1211 of the processor 1210 of the base station apparatus 1200 may include a DMRS configuration generating unit 1212 .

The DMRS pattern configuration information generating unit 1212 is configured to provide a signaling set of configuration information for DMRS transmitted for demodulation of a physical channel to be transmitted to the terminal (eg, a basic pattern overhead (including the presence or absence of a basic pattern), an additional pattern overhead (including the presence or absence of additional patterns), RE positions within slots of the base pattern (i.e., symbol positions and/or subcarrier positions), RE positions within slots of additional patterns (i.e., symbol positions and/or subcarrier positions), or virtual cells A combination of two or more elements in the identifier) may be determined and indicated to the UE.

The physical layer processing unit 1215 of the processor 1210 of the base station device 1200 may include a DMRS pattern setting information transmission unit 1216 , a DMRS transmission unit 1217 , and a physical channel transmission unit 1218 .

The DMRS pattern configuration information transmitter 1216 may configure downlink control information (DCI) including the DMRS configuration assigned to the terminal and transmit it through the transceiver 1230 .

For example, the DMRS pattern setting information transmitting unit 1216 includes information indicating any one of the signaling set candidates of the DMRS pattern setting information generated by the DMRS pattern setting information generating unit 1212 of the higher layer processing unit 1210. DCI may be transmitted to the UE.

The DMRS transmitter 1217 may map the DMRS on a physical resource based on the DMRS configuration assigned to the terminal and transmit it through the transceiver 1230 .

The physical channel transmitter 1217 may map a physical channel (eg, a downlink data channel) together with a DMRS transmitted to the terminal on a physical resource and transmit it through the transceiver 1230 .

The terminal device 1250 may include a processor 1260 , an antenna unit 1270 , a transceiver 1280 , and a memory 1290 .

The processor 1260 performs baseband-related signal processing and may include an upper layer processing unit 1261 and a physical layer processing unit 1265 . The higher layer processing unit 1261 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1265 may process PHY layer operations (eg, downlink reception signal processing, uplink transmission signal processing). The processor 1260 may control the overall operation of the terminal device 1250 in addition to performing baseband-related signal processing.

The antenna unit 1270 may include one or more physical antennas, and when it includes a plurality of antennas, it may support MIMO transmission/reception. The transceiver 1280 may include an RF transmitter and an RF receiver. The memory 1290 may store information processed by the processor 1260 , software related to the operation of the terminal device 1250 , an operating system, an application, and the like, and may include components such as a buffer.

The processor 1260 of the terminal device 1250 may be configured to implement the operation of the terminal in the embodiments described in the present invention.

The upper layer processing unit 1261 of the processor 1260 of the terminal device 1250 may include a DMRS pattern setting information determining unit 1262 .

* The DMRS pattern setting information determining unit 1262 is based on the higher layer signaling provided from the base station, the signaling set for the DMRS configuration (eg, basic pattern overhead (including the presence or absence of the basic pattern), additional pattern overhead (including the presence or absence of additional patterns), RE positions within slots of the base pattern (i.e., symbol positions and/or subcarrier positions), RE positions within slots of additional patterns (i.e., symbol positions and/or subcarrier positions), or virtual cells a combination of two or more elements in the identifier).

The physical layer processing unit 1265 of the processor 1260 of the terminal device 1250 may include a DMRS pattern setting information receiving unit 1266 , a DMRS receiving unit 1267 , and a physical channel receiving unit 1268 .

The DMRS pattern setting information receiving unit 1266 may receive DMRS pattern setting information provided from the base station through DCI through the transceiver 1280 .

For example, the DMRS pattern setting information receiving unit 1266 includes information indicating any one of the signaling set candidates of the DMRS pattern setting information determined by the DMRS pattern setting information determining unit 1262 of the higher layer processing unit 1261 DCI including information indicating can receive

The DMRS receiving unit 1267 may receive the DMRS transmitted thereto through the transceiver 1280 based on the DMRS setting confirmed through the DMRS setting information receiving unit 1266 .

The physical channel receiving unit 1268 may receive the physical channel transmitted along with the DMRS through the transceiver 1280 through the DMRS.

The physical layer processing unit 1265 may transmit the received DMRS and the physical channel to the higher layer processing unit 1261 and attempt to demodulate the physical channel based on the channel estimated using the DMRS.

In the operation of the base station apparatus 1200 and the terminal apparatus 1250, the descriptions in the examples of the present invention may be equally applied, and overlapping descriptions will be omitted.

Example methods of the present disclosure are expressed as a series of operations for clarity of description, but this is not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In order to implement the method according to the present disclosure, other steps may be included in addition to the illustrated steps, steps may be excluded from some steps, and/or other steps may be included except for some steps.

Various embodiments of the present disclosure do not list all possible combinations but are intended to describe representative aspects of the present disclosure, and matters described in various embodiments may be applied independently or in combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. For implementation by hardware, one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose It may be implemented by a processor (general processor), a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure includes software or machine-executable instructions (eg, operating system, application, firmware, program, etc.) that cause an operation according to the method of various embodiments to be executed on a device or computer, and such software or and non-transitory computer-readable media in which instructions and the like are stored and executable on a device or computer.

Claims (21)

In the device,
at least one processor; and
a memory storing instructions for causing the device to perform a specific operation by the at least one processor;
The specific action is:
Determine a first set, a second set and a third set of antenna ports for demodulation reference signal (DMRS) transmission, wherein a first code division multiplexing (CDM) group comprises the antenna ports a first set, a second CDM group comprising the second set of antenna ports, a third CDM group comprising the third set of antenna ports;
Determine a first frequency index associated with first adjacent resource elements for the first CDM group, wherein the first adjacent resource elements correspond to two adjacent symbols on a time axis, and first two adjacent subcarriers on a frequency axis corresponding to;
Determine a second frequency index associated with second adjacent resource elements for the second CDM group, wherein the second adjacent resource elements correspond to the two adjacent symbols on the time axis, and second two adjacent resource elements on the frequency axis corresponding to sub-carriers;
Determine a third frequency index associated with third adjacent resource elements for the third CDM group, wherein the third adjacent resource elements correspond to the two adjacent symbols on the time axis, and the third two adjacent resource elements on the frequency axis corresponding to subcarriers;
transmit a DMRS associated with the first set of antenna ports based on orthogonal cover codes applied to the first adjacent resource elements;
transmit a DMRS associated with the second set of antenna ports based on orthogonal cover codes applied to the second adjacent resource elements; and
transmit a DMRS associated with the third set of antenna ports based on orthogonal cover codes applied to the third adjacent resource elements;
wherein the orthogonal cover cords comprise at least one orthogonal cover cord applied to two adjacent subcarriers.
According to claim 1,
wherein the first CDM group, the second CDM group and the third CDM group each include four different antenna ports.
According to claim 1,
The first adjacent resource elements include a first resource element having a symbol index x and a subcarrier index y, and a second resource element having a symbol index x and a subcarrier index y+1, and a symbol index x+1 and a third resource element having a subcarrier index y, and a fourth resource element having a symbol index x+1 and a subcarrier index y+1,
Wherein x and y are positive integers,
The sequence of four orthogonal cover code values for the first resource element, the second resource element, the third resource element, and the fourth resource element is determined differently for each antenna port in the first set to do, device.
According to claim 1,
The specific action is:
determine to transmit the DMRS on two additional adjacent symbols;
determine, for the first CDM group, the first frequency index associated with fourth adjacent resource elements, wherein the fourth adjacent resource elements correspond to the additional two adjacent symbols on the time axis, and corresponding to the first two adjacent subcarriers;
transmit the DMRS associated with the first set of antenna ports based on the orthogonal cover codes applied to the fourth adjacent resource elements;
At least one symbol exists between the additional two adjacent symbols and the two adjacent symbols;
The additional two adjacent symbols and the two adjacent symbols are included in one slot.
According to claim 1,
The DMRS associated with the first set of antenna ports includes a DMRS for a physical downlink shared channel (PDSCH), and when transmitting the DMRS associated with the first set of antenna ports, transmitting the DMRS associated with the first set of antenna ports from a base station to a user terminal.
According to claim 1,
the DMRS associated with the first set of antenna ports includes a DMRS for a physical sidelink shared channel (PSSCH);
When transmitting the DMRS associated with the first set of antenna ports, transmit the DMRS associated with the first set of antenna ports from a user terminal to another user terminal.
According to claim 1,
the DMRS associated with the first set of antenna ports includes a DMRS for a physical uplink shared channel (PUSCH);
When transmitting the DMRS associated with the first set of antenna ports, transmitting the DMRS associated with the first set of antenna ports from a terminal to a base station.
In the device,
at least one processor; and
a memory storing instructions for causing the device to perform a specific operation by the at least one processor;
The specific action is:
For mapping of demodulation reference signals (DMRS) for at least three code division multiplexing (CDM) groups, two adjacent orthogonal frequency division multiplexing (OFDM) symbols are determined and ;
determine a first set, a second set and a third set of antenna ports for DMRS transmission, wherein a first CDM group includes the first set of antenna ports, and a second CDM group includes the first set of antenna ports. two sets; a third CDM group includes the third set of antenna ports;
For the first CDM group, determine a first frequency index associated with first four adjacent resource elements, wherein the first four adjacent resource elements include the two adjacent OFDM symbols on the time axis and the first two on the frequency axis corresponding to n adjacent subcarriers;
For the second CDM group, determine a second frequency index associated with second four adjacent resource elements, wherein the second four adjacent resource elements are the two adjacent OFDM symbols on the time axis and a second frequency index on the frequency axis corresponding to two adjacent subcarriers;
For the third CDM group, determine a third frequency index associated with third four adjacent resource elements, wherein the third four adjacent resource elements are the two adjacent OFDM symbols on the time axis and a third frequency index on the frequency axis corresponding to two adjacent subcarriers;
Map a first DMRS to the first four adjacent resource elements based on orthogonal cover codes applied to the first four adjacent resource elements, wherein the first DMRS is associated with the first set of antenna ports become;
Map a second DMRS to the second four adjacent resource elements based on orthogonal cover codes applied to the second four adjacent resource elements, wherein a second DMRS includes the second set of antenna ports and related; and
map a third DMRS to the third four adjacent resource elements based on orthogonal cover codes applied to the third four adjacent resource elements, wherein a third DMRS is associated with the third set of antenna ports become;
wherein the orthogonal cover cords comprise at least one orthogonal cover applied to two adjacent subcarriers.
9. The method of claim 8,
the first set of antenna ports comprises one to four antenna ports not included in the second CDM group or the third CDM group;
wherein the second set of antenna ports comprises one to four antenna ports not included in the first CDM group or the third CDM group.
9. The method of claim 8,
Antenna ports for DMRS transmission in the second CDM group are configured to be selected after at least one antenna port is selected for DMRS transmission from the first CDM group;
and antenna ports for DMRS transmission in the third CDM group are configured to be selected after at least one antenna port is selected for DMRS transmission from the second CDM group.
In the device,
at least one processor; and
a memory storing instructions for causing the device to perform a specific operation by the at least one processor;
The specific action is:
Receive information indicating a configuration type of a demodulation reference signal (DMRS), a plurality of sets of antenna ports for DMRS, and the number of code division multiplexing (CDM) groups scheduled for DMRS transmission wherein: a first CDM group includes a first set of the plurality of sets, and a second CDM group includes a second set of the plurality of sets;
determine two adjacent symbols for mapping of one or more DMRSs;
For the first CDM group, a first frequency index associated with first four adjacent resource elements is determined, wherein the first four adjacent resource elements include the two adjacent symbols on the time axis and the first two on the frequency axis. corresponding to adjacent subcarriers;
determine, for the second CDM group, a second frequency index associated with second four adjacent resource elements, wherein the second four adjacent resource elements are the two adjacent symbols on the time axis and a second on the frequency axis corresponding to two adjacent subcarriers;
transmit a DMRS associated with the first set of antenna ports based on orthogonal cover codes applied to the first four adjacent resource elements; and
transmit a DMRS associated with the second set of antenna ports based on orthogonal cover codes applied to the second four adjacent resource elements;
wherein the orthogonal cover codes comprise at least one orthogonal cover code applied to two adjacent subcarriers.
12. The method of claim 11,
The specific action is:
Determining whether to map a physical uplink shared channel (PUSCH) to the third or four adjacent resource elements based on information indicating the number of CDM groups scheduled for DMRS transmission , wherein the third four adjacent resource elements correspond to the two adjacent symbols on the time axis and the third two adjacent subcarriers on the frequency axis.
13. The method of claim 12,
The specific action is:
Determining the number of the CDM groups scheduled for the DMRS transmission to be 2 or 3,
When determining whether to map the third four adjacent resource elements to the PUSCH, it is determined that the third four adjacent resource elements are not mapped to the PUSCH.
12. The method of claim 11,
and the second set for DMRS transmission of the plurality of sets is configured to be selected from the first CDM group after at least one antenna port is selected for DMRS transmission.
12. The method of claim 11,
Each of the orthogonal cover codes is an orthogonal cover code of length-2;
The combination of the orthogonal cover codes is applied to the first four adjacent resource elements, and
The combination of the orthogonal cover codes is applied to the second four adjacent resource elements.
12. The method of claim 11,
a first value of a first one of the orthogonal cover codes is associated with a first one of the first two adjacent subcarriers;
The second value of the first orthogonal cover code of the orthogonal cover codes is the second value of the first two adjacent subcarriers? A device that relates to one.
17. The method of claim 16,
the first value of the first one of the orthogonal cover codes is associated with a first one of the second two adjacent subcarriers;
and the second value of the first one of the orthogonal cover codes is associated with a second one of the second two adjacent subcarriers.
12. The method of claim 11,
One of the twelve antenna ports is indicated based on the orthogonal cover codes and information of the CDM group,
The apparatus of claim 1, wherein the CDM groups are configured based on a frequency division multiplexing (FDM) scheme.
12. The method of claim 11,
a first value of a second one of the orthogonal cover codes is associated with a first one of the two adjacent symbols;
and a second value of the second one of the orthogonal cover codes is associated with a second one of the two adjacent symbols.
According to claim 1,
At least one of the first adjacent resource elements is adjacent to at least one of the second adjacent resource elements,
at least one of the second adjacent resource elements is adjacent to at least one of the third adjacent resource elements.
According to claim 1,
at least one of the orthogonal cover codes is an orthogonal cover code of length-2 associated with the first two adjacent subcarriers, the second two adjacent subcarriers, and the third two adjacent subcarriers; Device.

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