KR20180107996A - Method and apparatus for transmitting and receiving demodulation reference signal pattern configuration information for nr system - Google Patents

Abstract

The present disclosure relates to a method for transmitting and receiving demodulation reference signal (DMRS) pattern configuration information for an NR system and an apparatus thereof. According to one embodiment of the present disclosure, a method for signaling DMRS pattern configuration information in a wireless communication system comprises the steps of: receiving configuration information on candidates of a signaling set for the DMRS pattern configuration information from a base station through higher level signaling; receiving information indicating one signaling set of the candidates of the signaling set from the base station through downlink control information (DCI); and receiving DMRS according to a DMRS pattern determined based on the indicated signaling set. The candidates of the singling set may include a combination of two or more elements, such as basic pattern overhead, additional pattern overhead, basic pattern location, additional pattern location, or virtual cell identifier.

Description

TECHNICAL FIELD [0001] The present invention relates to a demodulation reference signal pattern setting information transmission / reception method,

The present disclosure is directed to a wireless communication system, and more particularly, 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) has been developing IMT (International Mobile Telecommunication) frameworks and standards, and is currently under discussion for 5G (5G) communication through a program called "IMT for 2020 and beyond" .

In order to meet the requirements of "IMT for 2020 and beyond ", the 3rd Generation Partnership Project (3GPP) NR (New Radio) system has various subcarrier spacing (SCS), as described in [5]. However, a demodulation reference signal (DeModulation) for supporting an increased number of layers supported by the NR system, an increased number of antenna ports, and multiuser multi-input multiple output (MU-MIMO) A method for signaling a pattern setting information and a pattern setting information for a reference signal (DMRS) has not yet been specifically defined.

SUMMARY OF THE INVENTION The present invention is directed to a method and apparatus for signaling pattern setting information of a demodulation reference signal supporting an increased number of layers and an increased antenna port.

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

The technical objects to be achieved by the present disclosure are not limited to the above-mentioned technical subjects, and other technical subjects which are not mentioned are to be clearly understood from the following description to those skilled in the art It will be possible.

A method for signaling a demodulation reference signal (DMRS) pattern setting information signal in a wireless communication system according to an aspect of the present disclosure includes receiving setup information for a candidate signaling set for the DMRS pattern setup information from a base station through higher layer signaling step; Receiving from the base station downlink control information (DCI) information indicating a signaling set of one of the signaling set candidates; And receiving the DMRS according to a DMRS pattern determined based on the one signaling set indicated, wherein the signaling set candidates are selected from at least one of basic pattern overhead, additional pattern overhead, , Or a combination of two or more elements in a virtual cell identifier.

The features briefly summarized above for this disclosure are only exemplary aspects of the detailed description of the disclosure which follow, and are not intended to limit the scope of the disclosure.

According to the present disclosure, a method and apparatus for signaling pattern setting information of a demodulation reference signal supporting an increased number of layers and an increased antenna port can 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 from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 is a diagram showing examples of a DMRS pattern according to the present disclosure;
2 is a diagram showing further examples of a DMRS pattern according to the present disclosure.
Figures 3 to 10 are diagrams illustrating various examples of a DMRS pattern in one PRB according to the present disclosure.
11 is a view for explaining a DMRS pattern setting information signaling method according to the present disclosure.
12 is a diagram showing a 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, which will be easily understood by those skilled in the art. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear. Parts not related to the description of the present disclosure in the drawings are omitted, and like parts are denoted by similar reference numerals.

In the present disclosure, when an element is referred to as being "connected", "coupled", or "connected" to another element, it is understood that not only a direct connection relationship but also an indirect connection relationship May also be included. Also, when an element is referred to as " comprising "or" having "another element, it is meant to include not only excluding another element but also another element .

In the present disclosure, the terms first, second, etc. are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements, etc. unless specifically stated otherwise. Thus, within the scope of this 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 may be referred to as a first component .

In the present disclosure, the components that are distinguished from each other are intended to clearly illustrate each feature and do not necessarily mean that components are separate. That is, a plurality of components may be integrated into one hardware or software unit, or a single component may be distributed into a plurality of hardware or software units. Thus, unless otherwise noted, such integrated or distributed embodiments are also included within the scope of this disclosure.

In the present disclosure, the components described in the various embodiments are not necessarily essential components, and some may be optional components. Thus, embodiments consisting of a subset of the components described in one embodiment are also included within the scope of the present disclosure. Also, embodiments that include other elements in addition to the elements described in the various embodiments are also included in the scope of the present disclosure.

The present disclosure is directed to a wireless communication network, wherein operations performed in a wireless communication network may be performed in a process of controlling a network and transmitting or receiving signals in a system (e.g., a base station) And may be performed in a process of transmitting or receiving a signal from a terminal coupled to a wireless network.

It will be appreciated that various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by a 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), an access point (AP) In addition, 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS) .

In this disclosure, transmitting or receiving a channel implies transmitting or receiving information or signals over the channel. For example, transmitting a control channel means transmitting control information or signals through a control channel. Similarly, transmitting a data channel means transmitting data information or signals 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 this disclosure apply from an existing system, but the scope of the present disclosure is not limited by these terms. Also, while the term NR system as used herein is used as an example of a wireless communication system capable of supporting various sub-carrier spacing (SCS), the term NR system itself refers to a wireless communication system supporting a plurality of SCS But is not limited to a system.

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

NR neurorrosion can refer to a number of fundamental factors or factors that create a resource grid on the time-frequency domain for the design of an NR system. For example, the subcarrier spacing corresponds to 15 kHz (or 7.5 kHz in the case of a MBSFN (Multicast-Broadcast Single-Frequency Network)), as an example of a download of the 3GPP LTE / LTE-A system. It should be noted that the term " cyclic prefix " refers not only to subcarrier spacing but also to CP (Cyclic Prefix) lengths (determined based on subcarrier spacing) ), The number of orthogonal frequency division multiplexing (OFDM) symbols in a predetermined time interval, the duration of one OFDM symbol, and the like. That is, different memories can be distinguished from each other by having different values in at least one of the subcarrier spacing, the CP length, the TTI length, the number of OFDM symbols within a predetermined time interval, or the duration of one OFDM symbol.

To meet the requirements of "IMT for 2020 and beyond", the current 3GPP NR system considers multiple neighbors in consideration of various scenarios, various service requirements, and compatibility with potential new systems. More specifically, with the existing radio communication systems, it is difficult to support a 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 URLLC (Ultra-Reliable and Low Latency Communications). In particular, the requirements for the user plane latency for the URLLC or eMBB service are 0.5ms in the uplink and 4ms in both the uplink and downlink, which is a requirement for 3GPP Long Term Evolution (LTE) and LTE-Advanced Lt; RTI ID = 0.0 > 10ms < / RTI >

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

To solve the problem of not being able to use a wide bandwidth in a frequency range or carrier such as the existing 700 MHz or 2 GHz, a new newsletter for an NR system including supporting a plurality of SCS, Or a wireless communication system operating in a frequency range or carrier such as 40 GHz, but the scope of the present disclosure is not so limited.

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

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

In the present disclosure, to support an increased number of layers and an increased number of antenna ports in an NR system, a method for determining a DMRS mapping time-frequency resource and for multiplexing DMRS for different antenna ports mapped on the same time- New DMRS configurations and examples of signaling schemes for the base station to instruct each terminal to set up this DMRS will be described.

Various examples of the present disclosure for DMRS layer, antenna port, sequence, and multiplexing for an NR system are described first. 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 the DMRS setting method considering the basic DL transmission from the base station to the terminal in the NR system, the DMRS setting method for the MU-MIMO considering both the SL and DL (i.e., DL DMRS). ≪ / RTI > The scope of the present disclosure is not so limited and includes examples of various purpose DMRS settings that may be supported by the NR system.

In the following examples, it is assumed that the number of DMRS orthogonal antenna ports (hereinafter, DMRS antenna ports) is maximum 12. For example, the DMRS antenna port numbers # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, # 10, # 11 and # 12 are defined. However, the actual DMRS antenna port number may be given a different number to distinguish it from other 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 + 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 maximum 16 or maximum 8.

In the case where the number of assignable DMRS layers per each terminal is 16, each layer may correspond to a combination of the antenna port and the sequence type. The sequence type can be distinguished by the value of the scrambling ID (SCID) used in the generation of the sequence used in the DMRS. For example, the DMRS sequence generated using A as the value of SCID can be distinguished from the DMRS sequence generated using B as the SCID value. An antenna port-SCID combination for the DMRS can be defined, for example, as shown in Table 1 below, and each of the 16 layers can correspond to one combination.

combination 안테나 포트 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, a sequence generated based on one SCID (for example, A) is used for DMRS antenna port numbers # 1 to # 8, and two SCIDs for DMRS antenna port numbers # 9 to # 12 For example, the sequence generated based on A and B may be used.

Also, the value of SCID may be A = 0 and B = 1, but is not limited thereto. For example, if the DMRS is based on a PN (Pseudo-random Noise) sequence, the initialization value of the PN sequence may include the SCID. Alternatively, the PN sequence initialization value may include, but is not limited to, a specific value for one or more of the cell (or terminal group), time, or frequency.

Each of the layers includes DMRS antenna port numbers # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, # 8, # 10, # 11, and # 12.

Hereinafter, examples of the DMRS pattern for the 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 as a physical resource block (PRB) unit 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). Thus, one PRB may contain 7 * 12 REs or 14 * 12 REs depending on the SCS.

The DMRS for the NR system can basically be placed in one or two consecutive OFDM symbols in a time slot in one slot and can be further DMRS (e.g., need to support time-varying channels due to fast moving speed) May be arranged behind the time of one slot.

This additional DMRS may be applied to high Doppler scenarios and may have the same or a lower density in the frequency domain than the DMRS in the front of the slot.

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

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

1 is a diagram showing examples of a DMRS pattern according to the present disclosure;

In the example of FIG. 1, 12 DMRS antenna ports are configured as six code division multiplexing (CDM) groups. For example, two DMRS antenna ports can be included in one CDM group, as shown in Table 2 below.

CDM group 안테나 포트 #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 can 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, the DMRS antenna ports belonging to different CDM groups may be multiplexed by frequency division multiplexing (FDM) by being mapped to different subcarriers, or may be multiplexed by time division multiplexing (TDM) by being mapped to different OFDM symbols Or may be multiplexed in FDM and TDM schemes by being mapped on different subcarriers and different OFDM symbols.

Two DMRS antenna ports belonging to one same CDM group can be distinguished by an orthogonal cover code (OCC). An OCC of length 2 can be used to distinguish the two antenna ports. In addition, the OCC can be applied in the time domain or in the frequency domain. For example, a length-2 OCC may be applied over two OFDM symbols, or may be applied across two subcarriers.

In the examples of FIG. 1, the REs to which the DMRS is mapped in one PRB are shown. The symbol index l may correspond to the index (e.g., l = 2) of the first symbol excluding the control region in one slot. Also, 12 subcarriers in the frequency domain may be subcarriers belonging to the mth PRB.

In the example of FIG. 1 (a), DMRS is mapped to a maximum of three symbols (i.e., l, l + 1 and l + l ') in one slot. Where l 'may be a value greater than two.

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

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

In the example of FIG. 1 (b), DMRS is mapped to a maximum of two symbols (i.e., l, l + 1) in one slot.

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

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

In the example of FIG. 1 (c), DMRS is mapped to a maximum of four symbols (i.e., l, l + 1, l + l ', l + l' + 1) in one slot.

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

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

In the example of FIG. 1 (d), DMRS is mapped to a maximum of two symbols (i.e., l, l + 1) in one slot.

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

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

2 is a diagram showing further examples of a DMRS pattern according to the present disclosure.

In the example of FIG. 2, 12 DMRS antenna ports are formed of three CDM groups. For example, four DMRS antenna ports can be included in one CDM group, as shown in Table 3 below.

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

In the example of Table 3, different CDM groups can 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, the DMRS antenna ports belonging to different CDM groups may be multiplexed in the FDM scheme by being mapped to different subcarriers, multiplexed in the TDM scheme by being mapped to different OFDM symbols, May be multiplexed in the FDM and TDM schemes by being mapped on OFDM symbols.

Four DMRS antenna ports belonging to one same CDM group can be distinguished by OCC. An OCC of length 4 can be used to distinguish the four antenna ports. In addition, the OCC can be applied in the time domain, applied in the frequency domain, or applied in the time-frequency domain. For example, an OCC of length-4 (length-4) may be applied over four OFDM symbols, applied over four subcarriers, or applied over two OFDM symbols and two subcarriers.

In the examples of FIG. 2, the REs to which the DMRS is mapped in one PRB are shown. The symbol index l may correspond to the index (e.g., l = 2) of the first symbol excluding the control region in one slot. Also, 12 subcarriers in the frequency domain may be subcarriers belonging to the mth PRB.

In the example of FIG. 2 (a), DMRS is mapped to a maximum of three symbols (i.e., l, l + 1 and l + l ') in one slot. Where l 'may be a value greater than two.

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

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

In the example of FIG. 2 (b), DMRS is mapped to a maximum of two symbols (i.e., l, l + 1) in one slot.

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

For example, CDM groups #A, #B, and #C are mapped to the symbol index l, and they can be distinguished from each other by the FDM scheme. CDM groups #A, #B, and #C are mapped to the symbol index l + 1, and they can be distinguished from each other by the FDM method. Here, each CDM group may be composed of only one symbol according to the overhead, or may be configured to both of the two symbols.

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

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

In the example of FIG. 2 (c), DMRS is mapped to a maximum of four symbols (i.e., l, l + 1, l + l ', l + l' + 1) in one slot.

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

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

In the example of FIG. 2 (d), DMRS is mapped to a maximum of two symbols (i.e., l, l + 1) in one slot.

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

Each CDM group can be repeated up to twice within one PRB on the frequency axis. That is, 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, one slot (e.g., nth slot) in the time domain and one PRB (e.g., mth PRB) corresponding to 12 subcarriers in the frequency domain DMRS pattern. An exemplary DMRS pattern may be repeated in one or more additional slots or one or more PRBs.

3 and FIG. 6 explained below, two DMRS antenna ports are mapped to one CDM group and a total of six CDM groups are allocated to a total of 12 DMRS antenna ports, as shown in the example of FIGS. 1 and 2 Lt; / RTI >

Figure 3 is an illustration of 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 FIG. 1 (a). That is, in the DMRS pattern of FIG. 3, the CDM groups #A and #B, which are distinguished by the FDM scheme, are mapped to the first symbol, and the CDM groups #C and #D classified by the FDM scheme are mapped to the second symbol And the third symbol may be mapped to the CDM groups #E and #F that are distinguished from each other by the FDM scheme.

First, an OCC mapping method will be described with reference to FIG. 3 (a).

In all cases, as shown in FIG. 3 (a), for one RE on a frequency axis in a symbol to which each CDM group is mapped, a first RE (for example, a RE with a low subcarrier index ) May be applied with an OCC value of a, and a second RE (e.g., RE with a high subcarrier index) may be applied with an OCC value of b. The OCC values a and b can 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 the DMRS antenna port # 1 of the CDM group #A, OCCs of +1 and +1 are applied over two REs in the frequency direction, and for the DMRS antenna port # 2 of the CDM group #A, An OCC of +1, -1 over two REs can be applied.

Each CDM group may be constructed by repeating one time (FIG. 3 (b)), two iterations (FIG. 3 (c)), or three iterations (FIG. 3 (d)) within one PRB on the frequency axis have.

As shown in FIG. 3B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to two REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 3 (b), each CDM group applies CDM (i.e., CDM2) with OCC of length -2 on the frequency axis for two consecutive or discontinuous REs of the frequency axis in one symbol, (I. E., Using two REs for two DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 3 (b) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 3C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of four REs in one PRB and two DMRS antenna ports are included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 3 (c), each CDM group applies CDM (i.e., CDM2) with OCC of length-2 to the frequency axis for two consecutive or discontinuous REs of the frequency axis in one symbol, (I.e., four REs are used for two DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 3 (c) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 3 (d), when the DMRS mapping pattern is repeated three times in one PRB, it can be expressed that the DMRS overhead is 1 PRB and 3 REs per port (i.e., 3 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to six REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having three REs as overheads .

In Figure 3 (d), each CDM group applies a CDM (i.e., CDM2) with OCC of length-2 on the frequency axis for two consecutive or discrete REs of the frequency axis in one symbol, (I. E., Using six REs for two DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in Figure 3 (d) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

Using the basic pattern as shown in FIGS. 3 (b) to 3 (d), additional DMRS can be mapped to the rear part of the slot in consideration of a high Doppler scenario.

Specifically, the relative positions of the REs to which the DMRS is mapped on time / frequency, excluding the specific symbol index and subcarrier index, as in the example of FIG. 1 (a) Can be defined as patterns 1-1, 1-2, and 1-3, respectively. Based on this, as shown in Table 5 below, the DMRS according to the basic pattern may be mapped to a portion before a time in one slot, and the DMRS according to an additional pattern may be mapped to a rear portion in time in the same slot.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) One 1-1 none 2 1-2 none 3 1-3 none 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 FIG. 3 (e) and FIG. 3 (f) correspond to the DMRS pattern examples 10 and 12 of Table 5, respectively.

4 is a diagram illustrating a further 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 of FIG. 1 (b). That is, in the DMRS pattern shown in FIG. 4, CDM groups #A, #B, and #C that are distinguished from each other by the FDM scheme are mapped to the first symbol, the CDM group #D, #E and #F can be mapped.

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

In all cases, as shown in Fig. 4 (a), in a symbol to which each CDM group is mapped, for the two REs on the frequency axis, a first RE (for example, a RE with a low subcarrier index ) May be applied with an OCC value of a, and a second RE (e.g., RE with a high subcarrier index) may be applied with an OCC value of b. The OCC values a and b can 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 the DMRS antenna port # 1 of the CDM group #A, OCCs of +1 and +1 are applied over two REs in the frequency direction, and for the DMRS antenna port # 2 of the CDM group #A, An OCC of +1, -1 over two REs can be applied.

Each CDM group can be composed of one repetition (Fig. 4 (b)) or two repetitions (Fig. 4 (c)) within one PRB on the frequency axis.

As shown in FIG. 4B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to two REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 4 (b), each CDM group applies CDM (i.e., CDM2) with OCC of length -2 on the frequency axis for two consecutive or discontinuous REs of the frequency axis in one symbol, (I. E., Using two REs for two DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 4 (b) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 4C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of four REs in one PRB and two DMRS antenna ports are included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 4 (c), each CDM group applies a CDM (i.e., CDM2) with OCC of length-2 to the frequency axis for two consecutive or discontinuous REs of the frequency axis in one symbol, (I.e., four REs are used for two DMRS antenna ports in one PRB) in a single PRB in the frequency domain, The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

4 (b) and 4 (c), an additional DMRS can be mapped to the rear part of the slot in consideration of a high Doppler scenario.

Specifically, the relative positions of the REs to which the DMRS is mapped on the time / frequency, except for the specific symbol index and the subcarrier index as in the example of FIG. 1 (b) in FIG. 4 (b) Can be defined as patterns 2-1 and 2-2, respectively. Based on this, it is possible to map the DMRS according to the basic pattern in the time before the time in one slot and to map the DMRS according to the additional pattern to the rear part in time in the same slot as shown in Table 7 below.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 13 2-1 none 14 2-2 none 15 2-1 2-1 16 2-1 2-2 17 2-2 2-1 18 2-2 2-2

The examples of FIG. 4 (d) and FIG. 4 (e) correspond to the DMRS pattern examples 17 and 18 of Table 7, respectively.

As a further example, based on the patterns 2-1 and 2-2, a DMRS according to the basic pattern is mapped to a part in the time in one slot as shown in Table 8 below, and a first additional pattern And the DMRS according to the second additional pattern.

DMRS pattern embodiment Basic pattern
(Front of slot) The first additional pattern
(Rear slot) The second additional pattern
(Rear slot) 19 2-1 none none 20 2-2 none none 21 2-1 2-1 none 22 2-1 2-2 none 23 2-2 2-1 none 24 2-2 2-2 none 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

The examples of FIG. 4 (f) and FIG. 4 (g) correspond to the DMRS pattern embodiments 29 and 32 of Table 8, respectively.

5 is a diagram illustrating a further 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 of FIG. 1 (c). That is, in the DMRS pattern of FIG. 5, the CDM groups #A, #B, #C, and #D are mapped to the first and second symbols by the FDM scheme and the third and fourth symbols are mapped to FDM CDM groups #E and #F classified by the method can be mapped.

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

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

Applying Case # 1 and Case # 2 alternately in the frequency direction in this manner can be problematic in that power balancing when only the same OCC value (for example, a) is mapped on one symbol Therefore, a and b, which are different OCC values, are alternately mapped to one symbol.

For example, if the 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 iteration is 0, 1, ..., C-1, Case # 1 is applied in the iteration index and case # 2 can be applied in the odd-numbering iteration index.

The 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 the DMRS antenna port # 1 of the CDM group #A, OCCs of +1 and +1 are applied over two REs in the time direction, and for the DMRS antenna port # 2 of the CDM group #A, An OCC of +1, -1 over two REs can be applied.

Each CDM group can be composed of one iteration (Fig. 5 (b)), two iterations (Fig. 5 (c)), or three iterations (Fig. 5 have.

As shown in FIG. 5B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to two REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 5 (b), each CDM group has a CDM (i.e., CDM2) by OCC of length-2 on the time axis for two identical or different REs on the frequency axis in two consecutive or discontinuous symbols , And this shows only one example of repetition within one PRB on the frequency axis (i.e., using two REs for two DMRS antenna ports in one PRB), and for DMRS REs in Figure 5 (b) The specific symbol index in the slot and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 5C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of four REs in one PRB and two DMRS antenna ports are included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 5 (c), each CDM group has a CDM (i.e., CDM2) with OCC of length-2 in the time axis for two identical or different REs on the frequency axis in two consecutive or discontinuous symbols , Which is an example of two iterations within a PRB in the frequency axis (i.e., using four REs for two DMRS antenna ports in one PRB), and for DMRS REs in FIG. 5 (c) The specific symbol index in the slot and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 5 (d), when the DMRS mapping pattern is repeated three times in one PRB, it can be expressed that the DMRS overhead is 1 PRB and 3 REs per port (i.e., 3 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to six REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having three REs as overheads .

In Figure 5 (d), each CDM group has a CDM (i.e., CDM2) by OCC of length-2 in the time axis for two identical or different REs on the frequency axis in two consecutive or discontinuous symbols , Which is an example of repeating three times in one PRB in the frequency axis (i.e., using six REs for two DMRS antenna ports in one PRB), and for DMRS REs in Figure 5 (d) The specific symbol index in the slot and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

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

Specifically, the relative positions of the REs to which the DMRS is mapped on time / frequency, except for the specific symbol index and the subcarrier index as in the example of FIG. 1 (c) in FIG. 5 (b) Can be defined as patterns 3-1, 3-2, and 3-3, respectively. Based on this, as shown in Table 10 below, it is also possible to map the DMRS according to the basic pattern in the time before the time in one slot and to map the DMRS according to the additional pattern in the back portion in time in the same slot.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 33 3-1 none 34 3-2 none 35 3-3 none 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

The examples of FIG. 5 (e) and FIG. 5 (f) correspond to the DMRS pattern examples 42 and 44 of Table 10, respectively.

6 is a diagram illustrating a further 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 of FIG. 1 (d). That is, in the DMRS pattern of FIG. 6, CDM groups #A, #B, #C, #D, #E, and #F, which are distinguished from each other by the FDM scheme, may be mapped to the first and second symbols.

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

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

Applying Case # 1 and Case # 2 alternately in the frequency direction in this manner can be problematic in that power balancing when only the same OCC value (for example, a) is mapped on one symbol Therefore, a and b, which are different OCC values, are alternately mapped to one symbol.

For example, if the 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 iteration is 0, 1, ..., C-1, Case # 1 is applied in the iteration index and case # 2 can be applied in the odd-numbering iteration index.

The OCC values a and b can 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 the DMRS antenna port # 1 of the CDM group #A, OCCs of +1 and +1 are applied over two REs in the time direction, and for the DMRS antenna port # 2 of the CDM group #A, An OCC of +1, -1 over two REs can be applied.

Each CDM group can be configured to repeat one time (FIG. 6 (b)) or twice (FIG. 4 (c)) within one PRB on the frequency axis.

6B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e. 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to two REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In Fig. 6 (b), each CDM group has a CDM (i.e., CDM2) by OCC of length-2 on the time axis for two identical or different REs on the frequency axis in two consecutive or discontinuous symbols , And this shows only an example of repeating one time in one PRB in the frequency axis (i.e., using two REs for two DMRS antenna ports in one PRB), and for DMRS REs in FIG. 6 (b) The specific symbol index in the slot and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 6C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of four REs in one PRB and two DMRS antenna ports are included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 6 (c), each CDM group has a CDM (i.e., CDM2) by OCC of length-2 on the time axis for two identical or different REs on the frequency axis in two consecutive or discontinuous symbols , And this is an example of two iterations in one PRB in the frequency axis (i.e., four REs for two DMRS antenna ports in one PRB), and for DMRS REs in Figure 6 (c) The specific symbol index in the slot and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

6 (b) and 6 (c), an additional DMRS can be mapped to the rear part of the slot in consideration of a high Doppler scenario.

Specifically, the relative positions of the REs to which the DMRS is mapped on time / frequency, except for the specific symbol index and the subcarrier index as in the example of FIG. 1 (a), in which the DMRS is mapped in FIG. 6 (b) Can be defined as patterns 4-1 and 4-2, respectively. Based on this, it is possible to map the DMRS according to the basic pattern in the time before the time in one slot and to map the DMRS according to the additional pattern in the later part in time in the same slot as shown in Table 12 below.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 45 4-1 none 46 4-2 none 47 4-1 4-1 48 4-1 4-2 49 4-2 4-1 50 4-2 4-2

The examples of FIG. 6 (d) and FIG. 6 (e) correspond to the DMRS pattern examples 49 and 50 of Table 12, respectively.

As a further example, based on the patterns 4-1 and 4-2, the DMRS according to the basic pattern is mapped to a portion before the time in one slot as shown in Table 13 below, and a first additional pattern And the DMRS according to the second additional pattern.

DMRS pattern embodiment Basic pattern
(Front of slot) The first additional pattern
(Rear slot) The second additional pattern
(Rear slot) 51 4-1 none none 52 4-2 none none 53 4-1 4-1 none 54 4-1 4-2 none 55 4-2 4-1 none 56 4-2 4-2 none 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

The examples of FIG. 6 (f) and FIG. 6 (g) correspond to the DMRS pattern examples 61 and 64 of Table 13, respectively.

7 to 10 will be described with reference to FIG. 2 and Table 3, in which four DMRS antenna ports are mapped to one CDM group, and three DMM antenna ports for a total of 12 DMRS antenna ports, Lt; / RTI >

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

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

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

In all cases, as shown in FIG. 7 (a), in a symbol to which each CDM group is mapped, for four REs on the frequency axis, a first RE (for example, (For example, RE with the second lowest subcarrier index) applies b to the OCC value, and applies the third RE (e.g., the third RE The RE with the lowest subcarrier index) may apply c as the OCC value and the fourth RE (e. G., The RE with the highest subcarrier index) may apply d as the OCC value.

The OCC values a, b, c, and d can 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, OCCs of +1, +1, +1, and +1 are applied to the four REs in the frequency direction for the DMRS antenna port # 1 of the CDM group #A, and the OCC of the DMRS antenna port # 2, OCCs of +1, -1, +1, -1 are applied across the four REs in the frequency direction and +1 for the DMRS antenna port # 3 of CDM group #A over the four REs in the frequency direction , +1, -1, -1 are applied to the DMRS antenna port # 4, and OCCs of +1, -1, -1 and -1 are applied to the four REs in the frequency direction for the DMRS antenna port # 4 of the CDM group #A .

Each CDM group can be composed of one repetition (Fig. 7B), two repetitions (Fig. 7C), or three repetitions (Fig. 7D) within one PRB on the frequency axis have.

As shown in FIG. 7B, when the DMRS mapping pattern is repeated one time in one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to four REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In Fig. 7 (b), each CDM group applies a CDM (i.e., CDM4) with an OCC of length -4 on the frequency axis for four consecutive or discontinuous REs of the frequency axis in one symbol, (I. E., Using four REs for four DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 7 (b) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 7 (c), when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of eight REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 7 (c), each CDM group applies a CDM (i.e., CDM4) with an OCC of length -4 on the frequency axis for four consecutive or discontinuous REs of the frequency axis in one symbol, (E.g., using 8 REs for 4 DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 7 (c) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 7 (d), when the DMRS mapping pattern is repeated three times in one PRB, it can be expressed that the DMRS overhead is 1 PRB and 3 REs per port (i.e., 3 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of 12 REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of 3 REs .

In FIG. 7 (d), each CDM group applies a CDM (i.e., CDM2) with an OCC of length -4 on the frequency axis for four consecutive or discontinuous REs of the frequency axis in one symbol, (I. E., Using 12 REs for four DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in Figure 7 (d) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

Using the basic pattern shown in FIGS. 7 (b) to 7 (d), additional DMRS can be mapped to the rear part of the slot in consideration of a high Doppler scenario.

Specifically, the relative positions of the REs to which the DMRS is mapped on time / frequency, except for the specific symbol index and subcarrier index as in the example of FIG. 2 (a), in which the DMRS is mapped in FIGS. 7 (b) Can be defined as patterns 5-1, 5-2, and 5-3, respectively. On the basis of this, it is possible to map the DMRS according to the basic pattern in the time before the time in one slot and to map the DMRS according to the additional pattern in the later part in time in the same slot as shown in Table 15 below.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 65 5-1 none 66 5-2 none 67 5-3 none 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

The examples of FIG. 7 (e) and FIG. 7 (f) correspond to the DMRS pattern examples 74 and 76 of Table 15, respectively.

8 is a diagram illustrating a further 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 of FIG. 2 (b). That is, in the DMRS pattern of FIG. 8, CDM groups #A, #B, and #C, which are distinguished from each other by the FDM scheme, may be mapped to the first symbol. Alternatively, in the DMRS pattern shown in FIG. 8, CDM groups #A, #B, and #C that are distinguished from each other by the FDM scheme are mapped to the first symbol, and CDM groups #A, #B, #C can 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 depending on the overhead.

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

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

In all cases, as shown in FIG. 8 (a), in a symbol to which each CDM group is mapped, for four REs on the frequency axis, a first RE (for example, (For example, RE with the second lowest subcarrier index) applies b to the OCC value, and applies the third RE (e.g., the third RE The RE with the lowest subcarrier index) may apply c as the OCC value and the fourth RE (e. G., The RE with the highest subcarrier index) may apply d as the OCC value.

The OCC values a, b, c and d can 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, OCCs of +1, +1, +1, and +1 are applied to the four REs in the frequency direction for the DMRS antenna port # 1 of the CDM group #A, and the OCC of the DMRS antenna port # 2, OCCs of +1, -1, +1, -1 are applied across the four REs in the frequency direction and +1 for the DMRS antenna port # 3 of CDM group #A over the four REs in the frequency direction , +1, -1, -1 are applied to the DMRS antenna port # 4, and OCCs of +1, -1, -1 and -1 are applied to the four REs in the frequency direction for the DMRS antenna port # 4 of the CDM group #A .

Each CDM group can be composed of one repetition (FIG. 8 (b)) or two repetitions (FIG. 8 (c)) within one PRB on the frequency axis.

8B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to four REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 8 (b), each CDM group applies a CDM (i.e., CDM4) with an OCC of length -4 on the frequency axis for four consecutive or discontinuous REs of the frequency axis in one symbol, (I. E., Using four REs for four DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 8 (b) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 8C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of eight REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 8 (c), each CDM group applies CDM (i.e., CDM4) with OCC of length -4 on the frequency axis to four consecutive or discontinuous REs of the frequency axis in one symbol, (I.e., using 8 REs for 4 DMRS antenna ports in one PRB) in a single PRB in the frequency domain, and only in the slot for the DMRS REs in FIG. 8 (c) The specific symbol index and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

8 (b) and 8 (c), an additional DMRS can be mapped to the rear portion of the slot in consideration of a high Doppler scenario.

Specifically, the relative positions of the REs to which the DMRS is mapped on time / frequency, except for the specific symbol index and the subcarrier index, as in the example of FIG. 2 (b) Can be defined as patterns 6-1 and 6-2, respectively. Based on this, it is possible to map the DMRS according to the basic pattern in the time before the time in one slot and to map the DMRS according to the additional pattern in the back portion in time in the same slot as shown in Table 17 below.

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 77 6-1 none 78 6-2 none 79 6-1 6-1 80 6-1 6-2 81 6-2 6-1 82 6-2 6-2

The examples of FIGS. 8 (d) and 8 (e) correspond to the DMRS pattern embodiments 81 and 82 of Table 17, respectively.

As a further example, based on the patterns 6-1 and 6-2, the DMRS according to the basic pattern is mapped to a part of the time before a time in one slot as shown in Table 18 below, and a first additional pattern And the DMRS according to the second additional pattern.

DMRS pattern embodiment Basic pattern
(Front of slot) The first additional pattern
(Rear slot) The second additional pattern
(Rear slot) 83 6-1 none none 84 6-2 none none 85 6-1 6-1 none 86 6-1 6-2 none 87 6-2 6-1 none 88 6-2 6-2 none 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

The examples of FIG. 8 (f) and FIG. 8 (g) correspond to the DMRS pattern embodiments 93 and 96 of Table 18, respectively.

9 is a diagram illustrating a further 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 of FIG. 2 (c). That is, in the DMRS pattern shown in FIG. 9, the CDM groups #A and #B are mapped to the first and second symbols by the FDM scheme, and the CDM group #C is mapped to the third and fourth symbols have.

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

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

Thus, application of case # 1 and case # 2 alternately in the frequency direction can be problematic in terms of power balance when only the same OCC values (e.g., a and b) are mapped on one symbol, So that a and b and c and d, which are different OCC values, are alternately mapped to one symbol.

For example, if the 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 iteration is 0, 1, ..., C-1, Case # 1 is applied in the iteration index and case # 2 can be applied in the odd-numbering iteration index.

With respect to the difference between the OCC mapping methods A, B, C, and D, the OCC mapping method A maps the OCC values a and b in the time axis direction first, The OCC mapping method B maps the OCC values a and b to the frequency axis direction and then maps the OCC values c and d to the frequency axis direction in the next time resource. The OCC mapping method C maps the OCC values a, b, c, and d in a clockwise direction starting from a time and frequency resource having the lowest index value, and the OCC mapping method D maps a time with the lowest index value The OCC values a, b, c, and d are mapped counterclockwise starting from the frequency resource.

The OCC values a, b, c, and d can 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, OCCs of +1, +1, +1, and +1 are applied to the four REs in the frequency direction for the DMRS antenna port # 1 of the CDM group #A, and the OCC of the DMRS antenna port # 2, OCCs of +1, -1, +1, -1 are applied across the four REs in the frequency direction and +1 for the DMRS antenna port # 3 of CDM group #A over the four REs in the frequency direction , +1, -1, -1 are applied to the DMRS antenna port # 4, and OCCs of +1, -1, -1 and -1 are applied to the four REs in the frequency direction for the DMRS antenna port # 4 of the CDM group #A .

Each CDM group can be composed of one iteration (FIG. 9 (b)), two iterations (FIG. 9 (c)), or three iterations (FIG. 9 have.

As shown in FIG. 9B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to four REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 9 (b), each CDM group has a length-to-frequency-time-frequency-domain structure with respect to a total of four REs on two consecutive or discontinuous two subcarriers per symbol in two consecutive or discontinuous symbols. (I.e., CDM4) by OCC of 4, and this represents an example of one iteration in one PRB on the frequency axis (i.e., using four REs for four DMRS antenna ports in one PRB) The specific symbol index in the slot for the DMRS REs of FIG. 9 (b) and the position of the subcarriers in the PRB are not limited, and may be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 9C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of eight REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 9 (c), each CDM group has a length-to-length-time-frequency-domain structure for a total of four REs on two consecutive or discontinuous two subcarriers per symbol in two consecutive or discontinuous symbols. (I.e., CDM4) by OCC of 4, and this represents an example of iterating twice within one PRB on the frequency axis (i.e., using 8 REs for 4 DMRS antenna ports in one PRB) The specific symbol index in the slot for the DMRS REs of FIG. 9 (c) and the position of the subcarriers in the PRB are not limited, and may be determined to be a fixed position or a position signaled by the base station.

As shown in FIG. 9D, when the DMRS mapping pattern is repeated three times in one PRB, it can be expressed that the DMRS overhead is 1 PRB and 3 REs per port (i.e., 3 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of 12 REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of 3 REs .

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

Using the basic pattern as shown in Figs. 9 (b) to 9 (d), additional DMRS can be mapped to the rear portion of the slot in consideration of a high Doppler scenario.

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

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 97 7-1 none 98 7-2 none 99 7-3 none 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

The examples of FIG. 9 (e) and FIG. 9 (f) correspond to the DMRS pattern examples 106 and 108 of Table 20, respectively.

10 is a diagram illustrating a further 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 of FIG. 2 (d). That is, in the DMRS pattern of FIG. 10, the CDM groups #A, #B, and #C, which are basically distinguished by the FDM scheme, may be mapped to the first and second symbols.

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

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

Thus, application of case # 1 and case # 2 alternately in the frequency direction can be problematic in terms of power balance when only the same OCC values (e.g., a and b) are mapped on one symbol, So that a and b and c and d, which are different OCC values, are alternately mapped to one symbol.

For example, if the 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 iteration is 0, 1, ..., C-1, Case # 1 is applied in the iteration index and case # 2 can be applied in the odd-numbering iteration index.

With respect to the difference between the OCC mapping methods A, B, C, and D, the OCC mapping method A maps the OCC values a and b in the time axis direction first, The OCC mapping method B maps the OCC values a and b to the frequency axis direction and then maps the OCC values c and d to the frequency axis direction in the next time resource. The OCC mapping method C maps the OCC values a, b, c, and d in a clockwise direction starting from a time and frequency resource having the lowest index value, and the OCC mapping method D maps a time with the lowest index value The OCC values a, b, c, and d are mapped counterclockwise starting from the frequency resource.

The OCC values a, b, c, and d can 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, OCCs of +1, +1, +1, and +1 are applied to the four REs in the frequency direction for the DMRS antenna port # 1 of the CDM group #A, and the OCC of the DMRS antenna port # 2, OCCs of +1, -1, +1, -1 are applied across the four REs in the frequency direction and +1 for the DMRS antenna port # 3 of CDM group #A over the four REs in the frequency direction , +1, -1, -1 are applied to the DMRS antenna port # 4, and OCCs of +1, -1, -1 and -1 are applied to the four REs in the frequency direction for the DMRS antenna port # 4 of the CDM group #A .

Each CDM group can be composed of one repetition (FIG. 10 (b)) or two repetitions (FIG. 10 (c)) within one PRB on the frequency axis.

10B, when the DMRS mapping pattern is repeated one time within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to four REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of one RE .

In FIG. 10 (b), each CDM group has a length-4 OCC in the time axis for a total of four REs on two consecutive or discontinuous two subcarriers per symbol in consecutive or discontinuous two symbols, (I.e., CDM4) by a PRB, and this is an example in which it is repeated one time within one PRB in the frequency axis (i.e., four REs are used for four DMRS antenna ports in one PRB) The specific symbol index in the slot for the DMRS REs 10 (b) and the position of the subcarriers in the PRB are not restrictive and can be determined to be a fixed position or a position signaled by the base station.

10C, when the DMRS mapping pattern is repeated twice within one PRB, it can be expressed that the DMRS overhead is 1 PRB and 2 REs per port (i.e., 2 RE per 1 port and 1 PRB) have. That is, since one CDM group is mapped to a total of eight REs in one PRB and one DMRS antenna port is included in one CDM group, one DMRS antenna port is expressed as having an overhead of two REs .

In FIG. 10 (c), each CDM group has a length-4 OCC in the time axis for a total of four REs on two consecutive or discontinuous two subcarriers per symbol in consecutive or discontinuous two symbols, (I.e., CDM4) by the CDM, and this is an example of two iterations in one PRB on the frequency axis (i. E. Eight REs for four DMRS antenna ports in one PRB) The specific symbol index in the slot for the DMRS REs 10 (c) and the position of the subcarriers in the PRB are not restrictive, and may be determined to be a fixed position or a position signaled by the base station.

10 (b) and 10 (c), an additional DMRS can be mapped to the rear part of the slot in consideration of a high Doppler scenario.

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

DMRS pattern embodiment Basic pattern
(Front of slot) Additional patterns
(Rear slot) 109 8-1 none 110 8-2 none 111 8-1 8-1 112 8-1 8-2 113 8-2 8-1 114 8-2 8-2

The examples of FIGS. 10 (d) and 10 (e) correspond to the DMRS pattern examples 113 and 114 of Table 22, respectively.

As a further example, on the basis of the patterns 8-1 and 8-2, the DMRS according to the basic pattern is mapped to a part of the time before the time in one slot as shown in Table 23 below, and a first additional pattern And the DMRS according to the second additional pattern.

DMRS pattern embodiment Basic pattern
(Front of slot) The first additional pattern
(Rear slot) The second additional pattern
(Rear slot) 115 8-1 none none 116 8-2 none none 117 8-1 8-1 none 118 8-1 8-2 none 119 8-2 8-1 none 120 8-2 8-2 none 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

The examples of FIG. 10 (f) and FIG. 10 (g) correspond to the DMRS pattern examples 125 and 128 of Table 23, respectively.

In the examples of the above-mentioned DMRS pattern, up to 12 DMRS antenna ports are divided into a maximum of 6 or 3 CDM groups, and when the DMRS antenna port overhead is 1 PRB and 1 RE per 1 port, 1 PRB and 1 port The DMRS pattern can be determined according to the case of 2 REs per 1 PRB and 3 REs per port. Further, an additional pattern may be applied in one slot.

Hereinafter, examples of the present invention regarding a method of indicating a DMRS pattern, i.e., a method of signaling a base station to signal setting information on a DMRS pattern will be described.

First, the factors to be considered for the DMRS pattern indication are i) basic pattern overhead (including basic patterns), ii) additional pattern overhead (including additional patterns), iii) Position and / or subcarrier location), iv) intra-slot RE location (i.e., symbol location and / or subcarrier location) of the additional pattern, v) virtual cell identifier.

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

DMRS may be transmitted together in a slot through which a physical channel requiring demodulation is transmitted. However, if DMRS bundling is applied in the time domain, it is assumed that a certain slot is a slot through which a physical channel is transmitted, but a DMRS basic pattern does not exist have. The DMRS bundling is a method of demodulating a physical channel in the plurality of slots based on channel information estimated using a DMRS transmitted in one of a plurality of slots.

For example, the overhead of the DMRS basic pattern can be signaled using 1-bit size information based on the examples shown in FIGS. 3, 5, 7 and 9. For example, two cases may be indicated where no DMRS basic pattern exists, or when there is a DMRS basic pattern, if there is a maximum overhead. For example, a bit value of 0 may indicate that the basic pattern DMRS overhead is zero (i.e., no DMRS exists in the slot). When the bit value is 1, the basic pattern DMRS overhead is 3 (i.e., the CDM group of the basic pattern is repeated three times in one PRB).

As a further example, the overhead of the DMRS basic pattern can be signaled using information of one bit size, based on the illustrations as in FIGS. 4, 6, 8, and 10 above. For example, two cases may be indicated where no DMRS basic pattern exists, or when there is a DMRS basic pattern, if there is a maximum overhead. For example, a bit value of 0 may indicate that the basic pattern DMRS overhead is zero (i.e., no DMRS exists in the slot). When the bit value is 1, the basic pattern DMRS overhead is 2 (i.e., the CDM group of the basic pattern is repeated twice in one PRB).

As another example, the overhead of the DMRS basic pattern can be signaled using information of a size of two bits, based on the examples shown in Figs. 3, 5, 7, and 9 above. For example, the DMRS basic pattern may not be present, or it may indicate a specific value of the DMRS overhead. For example, a bit value of 0 may indicate that the basic pattern DMRS overhead is zero (i.e., no DMRS exists in the slot). When the bit value is 1, it can indicate that the basic pattern DMRS overhead is 1 (i.e., the CDM group of the basic pattern is repeated once in one PRB). If the bit value is 2, the basic pattern DMRS overhead is 2 (i.e., the CDM group of the basic pattern is repeated twice in one PRB). When the bit value is 3, the basic pattern DMRS overhead is 3 (i.e., the CDM group of the basic pattern is repeated three times in one PRB).

As an additional example, the overhead of the DMRS basic pattern can be signaled using information of a size of two bits, based on the examples shown in FIGS. 4, 6, 8, and 10 above. For example, the DMRS basic pattern may not be present, or it may indicate a specific value of the DMRS overhead. For example, a bit value of 0 may indicate that the basic pattern DMRS overhead is zero (i.e., no DMRS exists in the slot). When the bit value is 1, it can indicate that the basic pattern DMRS overhead is 1 (i.e., the CDM group of the basic pattern is repeated once in one PRB). If the bit value is 2, the basic pattern DMRS overhead is 2 (i.e., the CDM group of the basic pattern is repeated twice in one PRB). The bit value 3 may be reserved.

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

If there is no DMRS basic pattern in any slot, there may be no additional pattern. Further, in a case where a high Doppler scenario is not taken into consideration, there may be no additional pattern in the 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 can be signaled using information of one bit size. For example, two cases may be indicated where no additional DMRS pattern exists, or if there is a DMRS additional pattern, the maximum overhead is present. For example, a bit value of 0 may indicate that the additional pattern DMRS overhead is zero (i.e., there is no DMRS add pattern in the slot). If the bit value is 1, the additional pattern DMRS overhead is 3 (i.e., the CDM group of the additional pattern is repeated three times in one PRB).

As a further example, the overhead of the DMRS additional pattern can be signaled using information of a size of 1 bit, based on the example as shown in Figs. 4, 6, 8, and 10 above. For example, two cases may be indicated where no additional DMRS pattern exists, or if there is a DMRS additional pattern, the maximum overhead is present. For example, if the bit value is 0, the additional pattern DMRS overhead may be zero (i.e., no DMRS first additional pattern and second additional pattern in the slot) . If the bit value is 1, the first additional pattern DMRS overhead is 2 (i.e., 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, the CDM group of the second additional pattern is repeated twice in one PRB).

As another example, the overhead of the DMRS additional pattern can be signaled using information of a size of 2 bits, based on the example as shown in FIGS. 3, 5, 7 and 9 above. For example, a DMRS additional pattern may not be present, or a specific value of the overhead of the DMRS additional pattern may be indicated. For example, a bit value of 0 may indicate that the additional pattern DMRS overhead is zero (i.e., there is no DMRS add pattern in the slot). A bit value of 1 may indicate that the additional pattern DMRS overhead is 1 (i.e., the CDM group of additional patterns is repeated one time in one PRB). If the bit value is 2, the additional pattern DMRS overhead is 2 (i.e., the CDM group of the additional pattern is repeated twice in one PRB). A bit value of 3 indicates that the additional pattern DMRS overhead is 3 (i.e., the CDM group of the additional pattern is repeated three times in one PRB).

As a further example, the overhead of the DMRS additional pattern can be signaled using 3-bit sized information, based on the example as in FIGS. 4, 6, 8, and 10 above. For example, a DMRS additional pattern may not be present, or a specific value of the overhead of the DMRS additional pattern may be indicated. For example, if the bit value is 0, then the additional pattern DMRS overhead may be zero (i.e., no DMRS first additional pattern and second additional pattern in the slot are present) have. When the bit value is 1, the first additional pattern DMRS overhead is 1 (i.e., the CDM group of the first additional pattern is repeated one time in one PRB), and the second additional pattern DMRS overhead is 0 That is, 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 (i.e., 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, 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 (i.e., the CDM group of the first additional pattern is repeated one time in one PRB), and the second additional pattern DMRS overhead is 1 That is, 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 (i.e., 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, the CDM group of the second additional pattern is repeated once in one PRB). When the bit value is 5, the first additional pattern DMRS overhead is 2 (i.e., 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, 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 less than or equal to the overhead of the first additional pattern (i.e., the overhead of the second additional pattern is not greater than the overhead of the first additional pattern) will be. Assuming that the overhead of the second additional pattern is always 0, only the bit values 0, 1, 2 can indicate the overhead of the first additional pattern.

As another example, the overhead of the DMRS additional pattern can be signaled using information of a size of 1 bit based on the examples shown in FIGS. 3, 5, 7, and 9 above. For example, two cases can be indicated where there is no DMRS add-on pattern, or if there is a DMRS add-on pattern, then there is a specific overhead that is not maximal. For example, a bit value of 0 may indicate that the additional pattern DMRS overhead is zero (i.e., there is no DMRS add pattern in the slot). A bit value of 1 may indicate that the additional pattern DMRS overhead is 2 (i.e., the CDM group of the additional pattern is repeated twice in one PRB).

As a further example, the overhead of the DMRS additional pattern can be signaled using information of a size of 1 bit, based on the example as shown in Figs. 4, 6, 8, and 10 above. For example, two cases can be indicated where there is no DMRS add-on pattern, or if there is a DMRS add-on pattern, then there is a specific overhead that is not maximal. For example, if the bit value is 0, the additional pattern DMRS overhead may be zero (i.e., no DMRS first additional pattern and second additional pattern in the slot) . If the bit value is 1, the first additional pattern DMRS overhead is 1 (i.e., the CDM group of the first additional pattern is repeated one time in one PRB), and the second additional pattern DMRS overhead is 1 That is, the CDM group of the second additional pattern is repeated once in one PRB).

As another example, the overhead of the DMRS additional pattern can be signaled using information of a size of 1 bit based on the examples shown in FIGS. 3, 5, 7, and 9 above. For example, two cases can be indicated where there is no DMRS add-on pattern, or if there is a DMRS add-on pattern, then there is a specific overhead that is not maximal. For example, a bit value of 0 may indicate that the additional pattern DMRS overhead is zero (i.e., there is no DMRS add pattern in the slot). A bit value of 1 may indicate that the additional pattern DMRS overhead is 1 (i.e., the CDM group of additional patterns is repeated one time in one PRB).

As a further example, the overhead of the DMRS additional pattern can be signaled using information of a size of 1 bit, based on the example as shown in Figs. 4, 6, 8, and 10 above. For example, two cases can be indicated where there is no DMRS add-on pattern, or if there is a DMRS add-on pattern, then there is a specific overhead that is not maximal. For example, if the bit value is 0, the additional pattern DMRS overhead may be zero (i.e., no DMRS first additional pattern and second additional pattern in the slot) . When the bit value is 1, the first additional pattern DMRS overhead is 1 (i.e., the CDM group of the first additional pattern is repeated one time in one PRB), and the second additional pattern DMRS overhead is 0 That is, the second additional pattern does not exist).

Next, iii) a signaling scheme of the RE position (i.e., the symbol position and / or the subcarrier position) in the slot of the basic pattern will be described.

In order to signal the RE position of the basic pattern, the position of the control area in the slot (i.e., the RE position to which the control channel is mapped), the overhead of the DMRS basic pattern, the position of the data area in the slot Position), etc., candidate positions to which the DMRS basic pattern can be mapped can be determined. It is possible to signal which position is used among these candidate positions. If the number of candidate positions is only one, the terminal 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 the symbol index value and / or the subcarrier index value.

Next, iv) a signaling scheme for the intra-slot RE position (i.e., symbol position and / or subcarrier position) of the 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 area position (for example, the downlink data channel transmission interval and position in TDD (Time Division Duplex) setting) The candidate positions to which the DMRS additional pattern can be mapped can be determined. It is possible to signal which position is used among these candidate positions. If the number of candidate positions is only one, the terminal 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 the symbol index value and / or the subcarrier index value, or may be defined as a value relative to the position of the basic pattern.

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

A virtual cell ID (VCID) may be set for cooperative transmission (Coordinated Multi-Point (CoMP) transmission) with another cell, for example, unlike a physical ID of a cell . Two or three or more VCIDs may be set. For example, the VCID for the TRP (Transmission Reception Point) that performs the operation based on sharing the same cell-specific ID or group-specific ID at the time of CoMP operation, a different cell-specific ID Or a VCID for TRPs that perform operations based on the group-specific ID. In this case, the BS may inform the VCID value that the MS will use for DMRS reception (i.e., used as an initial value of the DMRS sequence generation). In addition, although the VCID is not directly related to the DMRS pattern setting, since the value of the DMRS pattern setting element such as i) to iv) may be set based on the VCID (the DMRS pattern setting is performed in the MU- The UEs operating in the MU-MIMO can be configured with the same VCID), and the VCID is indirectly related to the DMRS pattern setting.

Hereinafter, the signaling scheme of the DMRS pattern setting information will be described.

As one example of the signaling scheme, the elements of the DMRS setup information, such as i) to v) described above, may be signaled individually or independently.

For example, i) dynamically indicating the basic pattern overhead (including basic patterns) by explicitly or implicitly including setting information in the downlink control information (DCI) or the like. Or i) explicitly or implicitly including configuration information for basic pattern overhead (including basic patterns) in higher layer signaling (e.g., Radio Resource Control (RRC) layer signaling, etc.) -static).

For example, ii) dynamically indicate the setting information for additional pattern overhead (including additional patterns), either explicitly or implicitly in the DCI. Or ii) explicitly or implicitly including configuration information for additional pattern overhead (including additional patterns) in higher layer signaling (e.g., RRC signaling, etc.).

For example, iii) the RE positions in the slots of the basic pattern (i.e., symbol positions and / or subcarrier positions) may not be signaled separately using predefined fixed values. Or iii) dynamically indicate, by explicitly or implicitly including setting information for the RE position (i.e., the symbol position and / or the subcarrier position) in the slot of the basic pattern in the DCI or the like. Or iii) explicitly or implicitly including in the upper layer signaling (e.g., RRC signaling) the setting information for the RE position (i.e., the symbol position and / or the subcarrier position) You can also point to static.

For example, iv) the RE positions in the slots of additional patterns (i.e., symbol positions and / or subcarrier positions) may not be signaled separately using predefined fixed values. Or iv) explicitly or implicitly including setting information for the RE position (i.e., symbol position and / or subcarrier position) of the additional pattern in the slot in the DCI or the like. Or iv) explicitly or implicitly including in the upper layer signaling (e.g., RRC signaling, etc.) the configuration information for the RE location (i.e., symbol location and / or subcarrier location) You can also point to static.

For example, v) may explicitly or implicitly include configuration information for a virtual cell identifier (VCID) in a DCI or the like and dynamically indicate it. Or v) explicitly or implicitly including configuration information for a virtual cell identifier (VCID) in higher layer signaling (e.g., RRC signaling, etc.).

In the above-described examples, when signaling the DMRS pattern setting information using the DCI or the like, it is possible to promptly dynamically direct the signal immediately when necessary. However, if the amount of information to be included in the DCI is changed or increased, have. Alternatively, in the case of signaling the DMRS pattern setting information using RRC signaling or the like, even if the amount of information included in the RRC signaling increases, the system performance may be degraded. However, the signaling may not be performed immediately if necessary.

As a further example of the signaling scheme, two or more of the elements of the DMRS configuration information, such as i) to v) described above, may be jointly signaled by joint encoding. That is, signaling set candidates considering two or more of the elements of the DMRS configuration information may be set through upper layer signaling, and one of the signaling set candidates may be indicated via the DCI.

The way to set the signaling set candidates quasi-statically via higher layer signaling may be as described for each of the elements of the DMRS setup information such as i) through v).

Also, any one of the plurality of signaling set candidates may dynamically indicate through a 1-bit or 2-bit indicator included in the DCI.

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

Example  One

This embodiment is a scheme for setting signaling set candidates that include elements of i) basic pattern overhead (including basic patterns), ii) additional pattern overhead (including additional patterns), and v) elements of virtual cell identifiers, One of the candidates can be dynamically indicated using 1-bit or 2-bit information included in the DCI.

Table 24 below shows an example in which the DMRS pattern setting information is dynamically indicated using 1-bit information included in the 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, basic DMRS pattern overhead # 1 and basic DMRS pattern overhead # 2 can be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The basic DMRS pattern overhead # 1 and the basic DMRS pattern overhead # 2 may be set to different values or the same value may be set.

Additional DMRS pattern overhead # 1 and additional DMRS pattern overhead # 2 may be set through RRC signaling, respectively, as described in the above-described ii) Additional Pattern Overhead Signaling Scheme. The additional DMRS pattern overhead # 1 and the additional DMRS pattern overhead # 2 may be set to different values or the same value may be set.

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

Table 25 below shows an example of dynamically indicating DMRS pattern setting information using 2-bit information included in the 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, the basic DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The 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.

Additional DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described above in ii) Additional Pattern Overhead Signaling Scheme. 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.

VCID # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described in the v) virtual cell identifier signaling scheme described above. The 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.

I) the RE positions in the slots of the basic pattern (i.e., the symbol positions and / or the subcarrier positions) and iv) the in-slot RE positions of the additional patterns (i.e., symbol positions and / Carrier position) may be set individually or independently via DCI or RRC signaling.

Example  2

This embodiment is a scheme for setting signaling set candidates that include elements of i) basic pattern overhead (including basic patterns), and ii) elements of additional pattern overhead (including additional patterns), and selecting any one of the candidates as DCI The information can be dynamically indicated using information of a size of 1 bit or 2 bits included in the information.

Table 26 below shows an example of dynamically indicating DMRS pattern setting information using 1-bit information included in the 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, basic DMRS pattern overhead # 1 and basic DMRS pattern overhead # 2 can be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The basic DMRS pattern overhead # 1 and the basic DMRS pattern overhead # 2 may be set to different values or the same value may be set.

Additional DMRS pattern overhead # 1 and additional DMRS pattern overhead # 2 may be set through RRC signaling, respectively, as described in the above-described ii) Additional Pattern Overhead Signaling Scheme. The additional DMRS pattern overhead # 1 and the additional DMRS pattern overhead # 2 may be set to different values or the same value may be set.

Table 27 below shows an example of dynamically indicating DMRS pattern setting information using 2-bit information included in the 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, the basic DMRS pattern overheads # 1, # 2, # 3, and # 4 can be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The 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.

Additional DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described above in ii) Additional Pattern Overhead Signaling Scheme. 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.

(I. E., A symbol position and / or a subcarrier position) of the basic pattern, iv) an in-slot RE position (i. E., A symbol position and / or a subcarrier < Location), and v) each of the virtual cell identifiers can be set individually or independently via DCI or RRC signaling.

Example  3

This embodiment is based on the assumption that i) basic pattern overhead (including basic patterns), ii) additional pattern overhead (including additional patterns), iii) RE position in the basic pattern (i.e., symbol position and / ), iv) an in-slot RE position (i.e., a symbol position and / or a subcarrier position) of the additional pattern, and v) a signaling set candidate comprising elements of the virtual cell identifier, The information can be dynamically indicated using information of a size of 1 bit or 2 bits included in the information.

Table 28 below shows an example of dynamically indicating DMRS pattern setting information using 1-bit information included in the 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
Location # 1 Add
DMRS pattern
Location # 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, basic DMRS pattern overhead # 1 and basic DMRS pattern overhead # 2 can be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The basic DMRS pattern overhead # 1 and the basic DMRS pattern overhead # 2 may be set to different values or the same value may be set.

Additional DMRS pattern overhead # 1 and additional DMRS pattern overhead # 2 may be set through RRC signaling, respectively, as described in the above-described ii) Additional Pattern Overhead Signaling Scheme. The additional DMRS pattern overhead # 1 and the additional DMRS pattern overhead # 2 may be set to different values or the same value may be set.

The basic DMRS pattern position # 1 and the basic DMRS pattern position # 2 are set through the RRC signaling, respectively, as described in iii) the in-slot RE position (i.e., symbol position and / or subcarrier position) The basic DMRS pattern position # 1 and the basic DMRS pattern position # 2 may be set to different values or the same value may be set.

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

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

Table 29 below shows an example in which the DMRS pattern setting information is dynamically indicated using the 2-bit information included in the 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
Location # 1 Add
DMRS pattern
Location # 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, the basic DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The 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.

Additional DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described above in ii) Additional Pattern Overhead Signaling Scheme. 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.

The basic DMRS pattern positions # 1, # 2, # 3, and # 4 perform RRC signaling as described in iii) the RE position (i.e., symbol position and / or subcarrier position) Lt; / RTI > 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.

The additional DMRS pattern positions # 1, # 2, # 3, and # 4, as described in iv) the in-slot RE position (i.e., symbol position and / or subcarrier location) signaling scheme of the above- Lt; / RTI > The 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.

VCID # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described in the v) virtual cell identifier signaling scheme described above. The 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 is based on the assumption that i) basic pattern overhead (including basic patterns), ii) additional pattern overhead (including additional patterns), iii) RE position in the basic pattern (i.e., symbol position and / ), And iv) a set of signaling set candidates that include elements of the additional pattern intra-slot RE position (i.e., symbol position and / or subcarrier position), wherein one of the candidates is a 1-bit It is possible to dynamically designate using 2-bit size information.

Table 30 below shows an example of dynamically designating the DMRS pattern setting information using 1-bit information included in the 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
Location # 1 Add
DMRS pattern
Location # 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, the basic DMRS pattern overhead # 1 and the basic DMRS pattern overhead # 2 can be set through RRC signaling, respectively, as described in i) the basic pattern overhead signaling scheme described above. The basic DMRS pattern overhead # 1 and the basic DMRS pattern overhead # 2 may be set to different values or the same value may be set.

Additional DMRS pattern overhead # 1 and additional DMRS pattern overhead # 2 may be set through RRC signaling, respectively, as described in the above-described ii) Additional Pattern Overhead Signaling Scheme. The additional DMRS pattern overhead # 1 and the additional DMRS pattern overhead # 2 may be set to different values or the same value may be set.

The basic DMRS pattern position # 1 and the basic DMRS pattern position # 2 are set through the RRC signaling, respectively, as described in iii) the in-slot RE position (i.e., symbol position and / or subcarrier position) The basic DMRS pattern position # 1 and the basic DMRS pattern position # 2 may be set to different values or the same value may be set.

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

Table 31 below shows an example of dynamically designating the DMRS pattern setting information using 2-bit information included in the 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
Location # 1 Add
DMRS pattern
Location # 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, the basic DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described above in i) the basic pattern overhead signaling scheme. The 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.

Additional DMRS pattern overheads # 1, # 2, # 3, and # 4 may be set through RRC signaling, respectively, as described above in ii) Additional Pattern Overhead Signaling Scheme. 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.

The basic DMRS pattern positions # 1, # 2, # 3, and # 4 perform RRC signaling as described in iii) the RE position (i.e., symbol position and / or subcarrier position) Lt; / RTI > 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.

The additional DMRS pattern positions # 1, # 2, # 3, and # 4, as described in iv) the in-slot RE position (i.e., symbol position and / or subcarrier location) signaling scheme of the above- Lt; / RTI > The 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.

The v) virtual cell identifiers not included in the upper layer signaling set candidate may be set individually or independently via DCI or RRC signaling.

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

In step S1110, the BS may determine signaling set candidates for the DMRS pattern setting to be allocated to the UE. One signaling set candidate includes a basic pattern overhead (with or without a basic pattern), additional pattern overhead (with or without additional patterns), a RE position (i.e., symbol position and / or subcarrier location) (I.e., a symbol position and / or a subcarrier position), or a combination of two or more elements in a virtual cell identifier.

In step S1120, the base station can inform the UE of the DMRS pattern setting signaling set candidates through higher layer signaling (for example, RRC signaling).

In step S1130, the base station can determine which one of the DMRS pattern setting signaling set candidates is actually allocated to the UE.

In step S1140, the base station may notify the terminal through dynamic signaling (e.g., DCI) of information indicating the DMRS pattern set signaling set (i.e., one of the candidates determined in step S1130).

In step S1150, the BS maps the DMRS on the physical resource according to the DMRS pattern corresponding to the signaling set, and transmits the DMRS to the UE, and may transmit the physical channel in the DMRS slot.

In step S1160, the UE can demodulate the signal received through the physical channel using the channel estimated based on the DMRS received from the BS.

Elements that are not included in the DMRS pattern setting signaling set candidates in the example of FIG. 11 can be set individually or independently to the UE via RRC signaling or DCI.

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

The base station apparatus 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 can process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit 1215 can process the operation of a physical (PHY) layer (e.g., uplink received signal processing, downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor 1210 may also control operation of the base station apparatus 1200.

The antenna unit 1220 may include one or more physical antennas, and may support Multiple Input Multiple Output (MIMO) transmission and reception when the antenna includes a plurality of antennas. Transceiver 1230 may include a radio frequency (RF) transmitter and an RF receiver. The memory 1240 may store computationally processed information of the processor 1210, software associated with the operation of the base station 1200, an operating system, applications, and the like, and may include components such as buffers.

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

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

The DMRS pattern setting information generating unit 1212 generates a signaling set (for example, basic pattern overhead (including basic patterns), additional pattern overheads (I.e., a symbol position and / or a subcarrier position) of the basic pattern, an RE position (i.e., a symbol position and / or a subcarrier position) of the additional pattern, A combination of two or more elements in the identifier), and can instruct the terminal.

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

The DMRS pattern setting information transmitting unit 1216 configures the downlink control information (DCI) including the DMRS settings allocated to the UE, and transmits the DCI 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 upper layer processing unit 1210 DCI to the terminal.

The DMRS transmitting unit 1217 may map the DMRS on physical resources and transmit the DMRS through the transceiver 1230 based on the DMRS setting allocated to the UE.

The physical channel transmitting unit 1217 may map a physical channel (e.g., a downlink data channel) together with the DMRS transmitted to the UE on physical resources, and transmit the physical channel through the transceiver 1230.

The terminal apparatus 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 upper layer processing unit 1261 can process the operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1265 can process the operation of the PHY layer (e.g., downlink received signal processing, uplink transmission signal processing). In addition to performing baseband related signal processing, the processor 1260 may also control operation of the entire terminal device 1250. [

The antenna unit 1270 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna includes a plurality of antennas. 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, applications, and the like, and may include components such as buffers.

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

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

The DMRS pattern setting information determination unit 1262 determines a signaling set (for example, basic pattern overhead (including basic patterns), additional pattern overheads (including basic patterns) for the DMRS based on the upper layer signaling provided from the base station (I.e., a symbol position and / or a subcarrier position) of the basic pattern, a RE position (i.e., a symbol position and / or a subcarrier position) of the additional pattern, ≪ / RTI > a combination of two or more of the elements of the < RTI ID = 0.0 >

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 can receive the DMRS pattern setting information provided through the DCI from the base station via the transceiver 1280. [

For example, the DMRS pattern setting information receiving unit 1266 receives the DCRS pattern setting information from the DMRS pattern setting information determining unit 1262 of the upper layer processing unit 1261, Lt; / RTI >

The DMRS receiving unit 1267 can receive the DMRS transmitted to the DMRS receiving unit 1267 via the transceiver 1280 based on the DMRS setting confirmed through the DMRS setting information receiving unit 1266. [

The physical channel receiver 1268 can receive the DMRS through the transceiver 1280 on the physical channel transmitted together with the DMRS.

The physical layer processing unit 1265 transfers the received DMRS and physical channel to the upper layer processing unit 1261, and attempts physical channel demodulation based on the channel estimated using the DMRS.

In the operation of the base station apparatus 1200 and the terminal apparatus 1250, the same elements as those of the exemplary embodiments of the present invention can be applied, and redundant description will be omitted.

Although the exemplary methods of this disclosure are represented by a series of acts for clarity of explanation, they are 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, the illustrative steps may additionally include other steps, include the remaining steps except for some steps, or may include additional steps other than some steps.

The various embodiments of the disclosure are not intended to be all-inclusive and are intended to illustrate representative aspects of the disclosure, and the features described in the various embodiments may be applied independently or in a combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, 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 A general processor, a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure is to be accorded the broadest interpretation as understanding of the principles of the invention, as well as software or machine-executable instructions (e.g., operating system, applications, firmware, Instructions, and the like are stored and are non-transitory computer-readable medium executable on the device or computer.

Claims (1)

A method for signaling a demodulation reference signal (DMRS) pattern setting information in a wireless communication system,
Receiving configuration information on candidates of a signaling set for the DMRS pattern setup information from a base station through higher layer signaling;
Receiving from the base station downlink control information (DCI) information indicating a signaling set of one of the signaling set candidates; And
And receiving the DMRS according to a DMRS pattern determined based on the one signaling set indicated,
Wherein the signaling set candidates comprise a combination of two or more elements in a basic pattern overhead, an additional pattern overhead, a basic pattern location, an additional pattern location, or a virtual cell identifier.

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