KR20230174202A - Method and apparatus for transmitting and receiving demodulation reference signal pattern configuration information for nr system - Google Patents

Abstract

This disclosure relates to a method and device for transmitting or receiving demodulation reference signal pattern setting information for an NR system. A method of signaling demodulation reference signal (DMRS) pattern setting information in a wireless communication system according to an embodiment of the present disclosure includes receiving setting information on candidates of a signaling set for the DMRS pattern setting information from a base station through higher layer signaling. steps; Receiving information indicating one signaling set among the signaling set candidates from the base station through downlink control information (DCI); and receiving the DMRS according to a DMRS pattern determined based on the indicated signaling set, wherein the signaling set candidates include basic pattern overhead, additional pattern overhead, basic pattern position, and additional pattern position. , or a combination of two or more elements of the virtual cell identifier.

Description

Method and device for transmitting and receiving demodulation reference signal pattern setting information for NR system {METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DEMODULATION REFERENCE SIGNAL PATTERN CONFIGURATION INFORMATION FOR NR SYSTEM}

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

The International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and is currently discussing 5th generation (5G) communications through a program called “IMT for 2020 and beyond.” .

In order to meet the requirements presented by "IMT for 2020 and beyond", the 3rd Generation Partnership Project (3GPP) NR (New Radio) system uses various subcarrier spacing in consideration of various scenarios, service requirements, potential system compatibility, etc. (sub-carrier spacing, SCS) is being discussed in the direction of support. However, the increased number of layers supported by the NR system, the increased number of antenna ports, and a demodulation reference signal (DeModulation) to support multi-user MIMO (Multi User-Multiple Input Multiple Output, MU-MIMO) for terminals in various operation modes There has been no specific decision yet regarding pattern configuration for Reference Signal (DMRS) and a method for signaling pattern configuration information.

The technical task of the present disclosure is to provide a method and device for signaling pattern setting information of a demodulated reference signal that supports an increased number of layers and an increased antenna port.

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

The technical problems to be achieved by this disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. You will be able to.

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

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

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

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

The effects that can be obtained 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 DMRS patterns according to the present disclosure.
Figure 2 is a diagram showing additional examples of DMRS patterns according to the present disclosure.
3 to 10 are diagrams showing various examples of DMRS patterns in one PRB according to the present disclosure.
Figure 11 is a diagram for explaining the DMRS pattern setting information signaling method according to the present disclosure.
Figure 12 is a diagram showing the configuration of a base station device and a terminal device according to the present disclosure.

Hereinafter, with reference to the attached drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily practice them. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein.

In describing embodiments of the present disclosure, if it is determined that detailed descriptions of known configurations or functions may obscure the gist of the present disclosure, detailed descriptions thereof will be omitted. In addition, in the drawings, parts that are not related to the description of the present disclosure are omitted, and similar parts are given similar reference numerals.

In the present disclosure, when a component is said to be “connected,” “coupled,” or “connected” to another component, this is not only a direct connection relationship, but also an indirect connection relationship in which another component exists in between. It may also be included. In addition, when a component is said to "include" or "have" another component, this does not mean excluding the other component, but may further include another component, unless specifically stated to the contrary. .

In the present disclosure, terms such as first, second, etc. are used only for the purpose of distinguishing one component from other components, and do not limit the order or importance of components unless specifically mentioned. Therefore, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, the second component in one embodiment may be referred to as a first component in another embodiment. It may also be called.

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

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

This disclosure describes a wireless communication network, and operations performed in the wireless communication network are performed in the process of controlling the network and transmitting or receiving signals in a system (e.g., a base station) in charge of the wireless communication network, or This can be done in the process of transmitting or receiving a signal from a terminal connected to a wireless network.

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

In the present disclosure, transmitting or receiving a channel includes transmitting or receiving information or signals through the channel. For example, transmitting a control channel means transmitting control information or signals through the control channel. Similarly, transmitting a data channel means transmitting data information or signals through a data channel.

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

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

NR numerology may refer to numerical values for basic elements or factors that create a resource grid in the time-frequency domain for the design of an NR system. For example, as an example of the numerology of the 3GPP LTE/LTE-A system, subcarrier spacing corresponds to 15 kHz (or 7.5 kHz in the case of Multicast-Broadcast Single-Frequency Network (MBSFN)). However, the term numerology does not mean only subcarrier spacing, but also refers to CP (Cyclic Prefix) length, TTI (Transmit Time Interval) that is related to subcarrier spacing (or determined based on subcarrier spacing). ) This means including length, number of OFDM (Orthogonal Frequency Division Multiplexing) symbols within a predetermined time interval, duration of one OFDM symbol, etc. That is, different numerologies can be distinguished from each other by having different values in one or more of subcarrier spacing, CP length, TTI length, number of OFDM symbols in a predetermined time interval, or duration of one OFDM symbol.

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

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

In order to meet these various scenarios and various requirements in one NR system, it is required to support various numerologies. In particular, unlike supporting one subcarrier spacing (SCS) in the existing LTE/LTE-A system, it is required to support multiple SCS.

The new numerology for the NR system, which includes supporting multiple SCS, is to solve the problem of not being able to use a wide bandwidth in the existing frequency range or carrier such as 700MHz or 2GHz, 6GHz Alternatively, it may be determined assuming a wireless communication system operating in a frequency range or carrier such as 40 GHz, but the scope of the present disclosure is not limited thereto.

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

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

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

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

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

Additionally, it is assumed that the maximum number of DMRS layers that can be assigned to each terminal is a maximum of 16 or a maximum of 8.

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

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

In the example in Table 1, for DMRS antenna port numbers #1 through #8, a sequence generated based on one SCID (e.g., A) is used, and for DMRS antenna port numbers #9 through #12, two SCIDs (e.g., A) are used. For example, sequences generated based on A and B) can be used. Additionally, the SCID value may be A=0 and B=1, but is not limited thereto. For example, when 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, values specific to one or more of cell (or UE group), time, or frequency. The number of DMRS layers that can be assigned to each UE is 8. In this case, each layer has any 8 of DMRS antenna port numbers #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12. It can correspond to any one of the antenna ports. Below, examples of DMRS patterns 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, DMRS mapping resources are defined in physical resource block (PRB) units, which are defined as 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. Additionally, a physical resource unit corresponding to one symbol and one subcarrier is called one resource element (RE). Accordingly, one PRB may include 7*12 REs or 14*12 REs depending on the SCS.

DMRS for NR system can basically be placed in one or two consecutive OFDM symbols at the front in time within one slot, and additional DMRS (e.g., needs to support channels that change rapidly in time due to fast movement speed) The DMRS (DMRS) used when there is can be placed later in time in one slot.

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

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

Additionally, for DL DMRS antenna port multiplexing, one or more of Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), or Code Division Multiplexing (CDM) may be applied. Code resources such as Orthogonal Cover Code (OCC) and Cyclic Shift can be used as multiplexing resources for CDM. Additionally, CDM can be applied in the time domain, frequency domain, or time and frequency domain.

1 is a diagram showing examples of DMRS patterns according to the present disclosure.

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

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

In the example of Table 2, different CDM groups may be distinguished by one or more of different frequency resources or different time resources. Here, the frequency resource may be a subcarrier, and the time resource may be a symbol. That is, DMRS antenna ports belonging to different CDM groups may be multiplexed in the FDM (frequency division multiplexing) method by being mapped to different subcarriers, or may be multiplexed in the TDM (time division multiplexing) method by being mapped to different OFDM symbols. Alternatively, it may be multiplexed in FDM and TDM methods by mapping on different subcarriers and different OFDM symbols. Two DMRS antenna ports belonging to the same CDM group can be distinguished by an orthogonal cover code (OCC). there is. An OCC of length 2 can be used to distinguish two antenna ports. Additionally, OCC can be applied in the time domain or in the frequency domain. For example, OCC of length-2 may be applied over two OFDM symbols or over two subcarriers. In the examples of Figure 1, the RE to which DMRS is mapped within one PRB represents them. The symbol index l may correspond to the index of the first symbol excluding the control area in one slot (for example, l = 2). Additionally, in the frequency domain, 12 subcarriers may be subcarriers belonging to the mth PRB. The example in FIG. 1(a) shows a case where DMRS is mapped to up to three symbols (i.e., l, l+1, and l+l') in one slot. Here, l' may be a value greater than 2.

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

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

The example in Figure 1(b) shows a case where DMRS is mapped to a maximum of two symbols (i.e., l, l+1) in one slot.

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

Each CDM group can be repeated up to two times within one PRB on the frequency axis. In other words, the maximum overhead occupied by one port in one PRB can be said to be two REs.

The example in Figure 1(c) shows a case where DMRS is mapped to up to 4 symbols (i.e., l, l+1, l+l', l+l'+1) in one slot.

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

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

The example in Figure 1(d) shows a case where DMRS is mapped to a maximum of two symbols (i.e., l, l+1) in one slot.

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

Each CDM group can be repeated up to two times within one PRB on the frequency axis. In other words, the maximum overhead occupied by one port in one PRB can be said to be two REs.

Figure 2 is a diagram showing additional examples of DMRS patterns according to the present disclosure.

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

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

In the example of Table 3, different CDM groups 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, DMRS antenna ports belonging to different CDM groups may be multiplexed in the FDM method by being mapped to different subcarriers, or may be multiplexed in the TDM method by being mapped to different OFDM symbols, and may be multiplexed in the TDM method by mapping to different subcarriers and different OFDM symbols. It can also be multiplexed in FDM and TDM methods by mapping 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 four antenna ports. Additionally, OCC may be applied in the time domain, in the frequency domain, or in the time-frequency domain. For example, an OCC of length-4 may be applied over 4 OFDM symbols, over 4 subcarriers, or over 2 OFDM symbols and 2 subcarriers. FIG. 2 The examples show REs to which DMRS is mapped within one PRB. The symbol index l may correspond to the index of the first symbol excluding the control area in one slot (for example, l = 2). Additionally, in the frequency domain, 12 subcarriers may be subcarriers belonging to the mth PRB. The example in FIG. 2(a) shows a case where DMRS is mapped to up to three symbols (i.e., l, l+1, and l+l') in one slot. Here, l' may be a value greater than 2.

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

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

The example in FIG. 2(b) shows a case where DMRS is mapped to up to two symbols (i.e., l, l+1) in one slot.

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

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

That is, CDM group #A, CDM group #B, and CDM group #C are each configured in symbol index l, and may be additionally configured in symbol index l+1 depending on overhead. Alternatively, CDM group #A is configured to repeat 1 or 2 times depending on the overhead only at symbol index l, and CDM group #C is configured to repeat 1 or 2 times depending on overhead only at symbol index l+1, and CDM group #C may be configured only at symbol index l or both symbol index l and symbol index l+1 depending on overhead.

Each CDM group can be repeated up to two times within one PRB on the frequency axis. In other words, the maximum overhead occupied by one port in one PRB can be said to be two REs.

The example in FIG. 2(c) shows a case where DMRS is mapped to up to 4 symbols (i.e., l, l+1, l+l', l+l'+1) in one slot.

Additionally, Figure 2(c) shows an example in which OCC of length-4 is applied in the time-frequency domain. Specifically, CDM groups #A and #B are mapped to symbol indices l and l+1, and they can be distinguished from each other using the FDM method. CDM group #C can 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. In other words, the maximum overhead occupied by one port in one PRB can be said to be 3 REs.

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

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

Each CDM group can be repeated up to two times within one PRB on the frequency axis. In other words, the maximum overhead occupied by one port in one PRB can be said to be two REs.

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

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

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

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

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

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1 is applied across two REs in the frequency direction, and for DMRS antenna port #2 of CDM group #A, OCC is applied across two REs in the frequency direction. An OCC of +1, -1 can be applied across two REs. Each CDM group repeats once (Figure 3(b)) and repeats twice (Figure 3(c)) within one PRB on the frequency axis. ), or can be configured by repeating 3 times (Figure 3(d)). As in the example of Figure 3(b), when the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead is 1 PRB. And it can be expressed as 1 RE per 1 port (i.e., 1RE per 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of two REs, and one CDM group includes two DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as one RE. You can. In Figure 3(b), each CDM group applies CDM (i.e., CDM2) by OCC of length-2 on the frequency axis to two continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating once within one PRB on the frequency axis (i.e., using two REs for two DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 3(b). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

As in the example of Figure 3(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 2 REs. You can.

In Figure 3(c), each CDM group applies CDM (i.e., CDM2) by OCC of length-2 on the frequency axis to two continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating twice within one PRB on the frequency axis (i.e., using 4 REs for 2 DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 3(c). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

As in the example of Figure 3(d), when the DMRS mapping pattern is repeated three times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 RE per 1 port (i.e., 3RE per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 6 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 3 REs. You can.

In Figure 3(d), each CDM group applies CDM (i.e., CDM2) by OCC of length-2 on the frequency axis to two continuous or discontinuous REs on the frequency axis within one symbol, and this It only shows an example of repeating 3 times within one PRB on the frequency axis (i.e., using 6 REs for 2 DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 3(d). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

Using the basic pattern shown in FIGS. 3(b) to 3(d), additional DMRS can be mapped to the back of the slot considering the high Doppler scenario.

Specifically, the pattern to which the DMRS is mapped in FIGS. 3(b) to 3(d) (the relative positions of the REs to which the DMRS is mapped in 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, a DMRS according to a basic pattern may be mapped to the front part of time within one slot, and a DMRS according to an additional pattern may be mapped to the back part of time within the same slot.

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) One 1-1 doesn't exist 2 1-2 doesn't exist 3 1-3 doesn't exist 4 1-1 1-1 5 1-1 1-2 6 1-1 1-3 7 1-2 1-1 8 1-2 1-2 9 1-2 1-3 10 1-3 1-1 11 1-3 1-2 12 1-3 1-3

The examples of FIGS. 3(e) and 3(f) correspond to DMRS pattern examples 10 and 12 of Table 5, respectively. Figure 4 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 4 may correspond to specific examples similar to the DMRS pattern shown in FIG. 1(b). That is, in the DMRS pattern of FIG. 4, CDM groups #A, #B, and #C, distinguished from each other by FDM method, are basically mapped to the first symbol, and CDM groups #D, distinguished from each other by FDM method, are mapped to the second symbol. #E, #F can be mapped. First, the OCC mapping method will be described with reference to Figure 4(a).

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1 is applied across two REs in the frequency direction, and for DMRS antenna port #2 of CDM group #A, OCC is applied across two REs in the frequency direction. An OCC of +1, -1 can be applied across two REs. Each CDM group has one repetition (Figure 4(b)) or two repetitions (Figure 4(c)) within one PRB on the frequency axis. ))). *If the DMRS mapping pattern is repeated once within one PRB as in the example of Figure 4(b), the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE). per 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of two REs, and one CDM group includes two DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as one RE. You can.

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

As in the example of Figure 4(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 2 REs. You can.

In Figure 4(c), each CDM group applies CDM (i.e., CDM2) by OCC of length-2 on the frequency axis to two continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating twice within one PRB on the frequency axis (i.e., using 4 REs for 2 DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 4(c). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

Using the basic pattern shown in Figures 4(b) and 4(c), additional DMRS can be mapped to the back of the slot to take into account the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 13 2-1 doesn't exist 14 2-2 doesn't exist 15 2-1 2-1 16 2-1 2-2 17 2-2 2-1 18 2-2 2-2

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

DMRS pattern embodiment basic pattern
(front part of slot) 1st additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 19 2-1 doesn't exist doesn't exist 20 2-2 doesn't exist doesn't exist 21 2-1 2-1 doesn't exist 22 2-1 2-2 doesn't exist 23 2-2 2-1 doesn't exist 24 2-2 2-2 doesn't exist 25 2-1 2-1 2-1 26 2-1 2-1 2-2 27 2-1 2-2 2-1 28 2-1 2-2 2-2 29 2-2 2-1 2-1 30 2-2 2-1 2-2 31 2-2 2-2 2-1 32 2-2 2-2 2-2

The examples of FIGS. 4(f) and 4(g) correspond to DMRS pattern examples 29 and 32 in Table 8, respectively. Figure 5 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 5 may correspond to specific examples similar to the DMRS pattern shown in FIG. 1(c). That is, in the DMRS pattern of FIG. 5, CDM groups #A, #B, #C, and #D, distinguished by FDM, are basically mapped to the first and second symbols, and FDM groups are mapped to the third and fourth symbols. CDM groups #E and #F divided by method can be mapped.

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

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

In this way, applying Case #1 and Case #2 alternately in the frequency direction can cause power balancing problems when only the same OCC value (e.g., a) is mapped on one symbol. Therefore, this is to allow different OCC values, a and b, to be alternately mapped to one symbol.

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

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1 is applied across two REs in the time direction, and for DMRS antenna port #2 of CDM group #A, OCC is applied across two REs in the time direction. An OCC of +1, -1 can be applied across two REs. Each CDM group repeats once (Figure 5(b)) and repeats twice (Figure 5(c)) within one PRB on the frequency axis. ), or can be configured by repeating 3 times (Figure 5(d)). As in the example of Figure 5(b), when the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead is 1 PRB. And it can be expressed as 1 RE per 1 port (i.e., 1RE per 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of two REs, and one CDM group includes two DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as one RE. You can. In Figure 5(b), each CDM group performs CDM (i.e., CDM2) by OCC of length-2 on the time axis for two REs that are the same or different on the frequency axis within two continuous or discontinuous symbols. Apply, and this only represents an example of repeating once within one PRB in the frequency axis (i.e., using two REs for two DMRS antenna ports within one PRB), and for the DMRS REs in Figure 5(b) The specific symbol index within the slot and the position of the subcarrier within the PRB are not limited and may be determined as a pre-fixed position or a position signaled by the base station.

As in the example of Figure 5(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 2 REs. You can.

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

As in the example of Figure 5(d), when the DMRS mapping pattern is repeated three times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 RE per 1 port (i.e., 3RE per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 6 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 3 REs. You can.

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

Using the basic pattern shown in FIGS. 5(b) to 5(d), additional DMRS can be mapped to the back of the slot considering the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 33 3-1 doesn't exist 34 3-2 doesn't exist 35 3-3 doesn't exist 36 3-1 3-1 37 3-1 3-2 38 3-1 3-3 39 3-2 3-1 40 3-2 3-2 41 3-2 3-3 42 3-3 3-1 43 3-3 3-2 44 3-3 3-3

The examples of FIGS. 5(e) and 5(f) correspond to DMRS pattern examples 42 and 44 in Table 10, respectively. Figure 6 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 6 may correspond to specific examples similar to the DMRS pattern shown in FIG. 1(d). That is, in the DMRS pattern of FIG. 6, CDM groups #A, #B, #C, #D, #E, and #F, which are distinguished by FDM, can be mapped to the first and second symbols. First, the OCC mapping method will be described with reference to Figure 6(a).

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

In this way, applying Case #1 and Case #2 alternately in the frequency direction can cause power balancing problems when only the same OCC value (e.g., a) is mapped on one symbol. Therefore, this is to allow different OCC values, a and b, to be alternately mapped to one symbol.

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

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1 is applied across two REs in the time direction, and for DMRS antenna port #2 of CDM group #A, OCC is applied across two REs in the time direction. An OCC of +1, -1 can be applied across two REs. Each CDM group has one repetition (Figure 6(b)) or two repetitions (Figure 4(c)) within one PRB on the frequency axis. ))). As shown in the example of Figure 6(b), when the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead is 1 PRB and 1 RE per port (i.e., 1 RE per It can be expressed as 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of two REs, and one CDM group includes two DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as one RE. You can. In Figure 6(b), each CDM group performs CDM (i.e., CDM2) by OCC of length-2 on the time axis for two REs that are the same or different on the frequency axis within two continuous or discontinuous symbols. Apply, and this only represents an example of repeating once within one PRB in the frequency axis (i.e., using two REs for two DMRS antenna ports within one PRB), and for the DMRS REs in Figure 6(b) The specific symbol index within the slot and the position of the subcarrier within the PRB are not limited and may be determined as a pre-fixed position or a position signaled by the base station.

As in the example of Figure 6(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 2 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 2 REs. You can.

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

Using the basic pattern shown in FIGS. 6(b) and 6(c), additional DMRS can be mapped to the back of the slot to take into account the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 45 4-1 doesn't exist 46 4-2 doesn't exist 47 4-1 4-1 48 4-1 4-2 49 4-2 4-1 50 4-2 4-2

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

DMRS pattern embodiment basic pattern
(front part of slot) 1st additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 51 4-1 doesn't exist doesn't exist 52 4-2 doesn't exist doesn't exist 53 4-1 4-1 doesn't exist 54 4-1 4-2 doesn't exist 55 4-2 4-1 doesn't exist 56 4-2 4-2 doesn't exist 57 4-1 4-1 4-1 58 4-1 4-1 4-2 59 4-1 4-2 4-1 60 4-1 4-2 4-2 61 4-2 4-1 4-1 62 4-2 4-1 4-2 63 4-2 4-2 4-1 64 4-2 4-2 4-2

The examples of FIGS. 6(f) and 6(g) correspond to DMRS pattern examples 61 and 64 in Table 13, respectively. In the examples of FIGS. 7 to 10 described below, 4 DMRS antenna ports are mapped to one CDM group, as in the example of FIG. 2 and Table 3, and a total of 3 CDM groups are mapped for a total of 12 DMRS antenna ports. It can be configured. Figure 7 is a diagram showing an additional 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 shown in FIG. 2(a). That is, in the DMRS pattern of FIG. 7, CDM group #A can be basically mapped to the first symbol, CDM group #B can be mapped to the second symbol, and CDM group #C can be mapped to the third symbol.

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

As shown in Figure 7(a), in all cases, for four REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (e.g., with the lowest subcarrier index) Apply a as the OCC value to the RE), apply b as the OCC value to the second RE (e.g., the RE with the 2nd lowest subcarrier index), and apply b as the OCC value to the third RE (e.g., the RE with the 2nd lowest subcarrier index). c can be applied as the OCC value to the RE with a low subcarrier index), and d can be applied as the OCC value to the fourth RE (for example, the RE with the highest subcarrier index).

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1, +1, +1 is applied across the four REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied across the four REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 is applied across the four REs in the frequency direction. , OCC of +1, -1, -1 is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied across four REs in the frequency direction. Each CDM group can be repeated 1 time (Figure 7(b)), 2 times (Figure 7(c)), or 3 times (Figure 7(d)) within one PRB on the frequency axis. It can be configured. As in the example of Figure 7(b), when the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead is 1 RE per 1 PRB and 1 port (i.e., 1RE per 1port and 1PRB). ) can be expressed as That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 1 RE. You can. In Figure 7(b), each CDM group applies CDM (i.e., CDM4) by OCC of length-4 on the frequency axis to four continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating once within one PRB on the frequency axis (i.e., using 4 REs for 4 DMRS antenna ports within one PRB), and within the slot for DMRS REs in FIG. 7(b). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice within one PRB, as shown in the example in Figure 7(c), the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 2 REs. You can.

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

As in the example of Figure 7(d), when the DMRS mapping pattern is repeated three times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 RE per 1 port (i.e., 3RE per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 12 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 3 REs. You can.

In Figure 7(d), each CDM group applies CDM (i.e., CDM2) by OCC of length-4 on the frequency axis to four continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating 3 times within one PRB on the frequency axis (i.e., using 12 REs for 4 DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 7(d). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-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 back of the slot considering the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 65 5-1 doesn't exist 66 5-2 doesn't exist 67 5-3 doesn't exist 68 5-1 5-1 69 5-1 5-2 70 5-1 5-3 71 5-2 5-1 72 5-2 5-2 73 5-2 5-3 74 5-3 5-1 75 5-3 5-2 76 5-3 5-3

The examples of FIGS. 7(e) and 7(f) correspond to DMRS pattern examples 74 and 76 in Table 15, respectively. Figure 8 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 8 may correspond to specific examples similar to the DMRS pattern shown in FIG. 2(b). That is, in the DMRS pattern of FIG. 8, CDM groups #A, #B, and #C, which are distinguished from each other in the FDM method, can be basically mapped to the first symbol. Alternatively, in the DMRS pattern of FIG. 8, basically, CDM groups #A, #B, and #C, distinguished from each other by FDM method, are mapped to the first symbol, and CDM groups #A, #B, #C can be mapped. Likewise, each CDM group may be mapped to only the first symbol, or to both the first and second symbols, depending on the overhead. As a further example, CDM group #A is mapped to the first symbol and , CDM group #C can be mapped to the second symbol. CDM group #B may be mapped to only the first symbol, or to both the first symbol and the second symbol, depending on overhead.

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

As shown in Figure 8(a), in all cases, for four REs on the frequency axis within one symbol to which each CDM group is mapped, the first RE (e.g., with the lowest subcarrier index) Apply a as the OCC value to the RE), apply b as the OCC value to the second RE (e.g., the RE with the 2nd lowest subcarrier index), and apply b as the OCC value to the third RE (e.g., the RE with the 2nd lowest subcarrier index). c can be applied as the OCC value to the RE with a low subcarrier index), and d can be applied as the OCC value to the fourth RE (for example, the RE with the highest subcarrier index).

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1, +1, +1 is applied across the four REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied across the four REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 is applied across the four REs in the frequency direction. , OCC of +1, -1, -1 is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied across four REs in the frequency direction. Each CDM group can be composed of one repetition (Figure 8(b)) or two repetitions (Figure 8(c)) within one PRB on the frequency axis. In Figure 8(b) As an example, if the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead can be expressed as 1 PRB and 1 RE per 1 port (i.e., 1RE per 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 1 RE. You can. In Figure 8(b), each CDM group applies CDM (i.e., CDM4) by OCC of length-4 on the frequency axis to four continuous or discontinuous REs on the frequency axis within one symbol, and this is It only shows an example of repeating once within one PRB on the frequency axis (i.e., using 4 REs for 4 DMRS antenna ports within one PRB), and within the slot for DMRS REs in Figure 8(b). The specific symbol index and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

As in the example of Figure 8(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 2 REs. You can.

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

Using the basic pattern shown in Figures 8(b) and 8(c), additional DMRS can be mapped to the back of the slot to take into account the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 77 6-1 doesn't exist 78 6-2 doesn't exist 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 DMRS pattern examples 81 and 82 in Table 17, respectively. As an additional example, based on patterns 6-1 and 6-2, a DMRS according to the basic pattern is mapped to the front part of time within one slot, as shown in Table 18 below, and the first additional pattern is mapped to the back part of time within the same slot. And the DMRS may be mapped according to the second additional pattern.

DMRS pattern embodiment basic pattern
(front part of slot) 1st additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 83 6-1 doesn't exist doesn't exist 84 6-2 doesn't exist doesn't exist 85 6-1 6-1 doesn't exist 86 6-1 6-2 doesn't exist 87 6-2 6-1 doesn't exist 88 6-2 6-2 doesn't exist 89 6-1 6-1 6-1 90 6-1 6-1 6-2 91 6-1 6-2 6-1 92 6-1 6-2 6-2 93 6-2 6-1 6-1 94 6-2 6-1 6-2 95 6-2 6-2 6-1 96 6-2 6-2 6-2

The examples of FIGS. 8(f) and 8(g) correspond to DMRS pattern examples 93 and 96 in Table 18, respectively. Figure 9 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 9 may correspond to specific examples similar to the DMRS pattern shown in FIG. 2(c). That is, in the DMRS pattern of FIG. 9, CDM groups #A and #B, distinguished from each other by FDM, are basically mapped to the first and second symbols, and CDM group #C can be mapped to the third and fourth symbols. there is. 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 Figure 9(a), for a total of 4 REs on the time axis and frequency axis within 2 symbols to which each CDM group is mapped, case #1 The mapping method and the mapping method of Case #2 can be applied alternately in the frequency direction. The OCC mapping on the first symbol in Case #1 is the same as the OCC mapping on the second symbol in Case #2, and the OCC mapping on the second symbol in Case #1 is the same as the OCC mapping on the first symbol in Case #2. It may be the same as OCC mapping.

In this way, applying Case #1 and Case #2 alternately in the frequency direction can be a problem in power balance when only the same OCC values (e.g., a and b) are mapped on one symbol. This is to allow different OCC values, a and b, and c and d, to be alternately mapped to one symbol.

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

To explain the differences between OCC mapping methods A, B, C, and D based on case #1, OCC mapping method A first maps OCC values a and b in the time axis direction, and then fills them in the time axis direction. This is a method of mapping OCC values c and d, and OCC mapping method B is a method of first mapping OCC values a and b in the direction of the frequency axis, and then mapping OCC values c and d in the direction of the frequency axis from the time resource. , OCC mapping method C is a method that maps OCC values a, b, c, and d clockwise starting from the time and frequency resource with the lowest index value, and OCC mapping method D is the time and frequency resource with the lowest index value. This is a method that maps OCC values a, b, c, and d starting from the frequency resource in a counterclockwise direction.

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1, +1, +1 is applied across the four REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied across the four REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 is applied across the four REs in the frequency direction. , OCC of +1, -1, -1 is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied across four REs in the frequency direction. Each CDM group can be repeated 1 time (Figure 9(b)), 2 times (Figure 9(c)), or 3 times (Figure 9(d)) within one PRB on the frequency axis. It can be configured. If the DMRS mapping pattern is repeated once within one PRB, as in the example of Figure 9(b), the DMRS overhead is 1 RE per 1 PRB and 1 port (i.e., 1RE per 1port and 1PRB). ) can be expressed as That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 1 RE. You can. In FIG. 9(b), each CDM group has a length in the time axis and frequency axis for a total of 4 REs on two continuous or discontinuous subcarriers per symbol within two consecutive or discontinuous symbols. Applying CDM with an OCC of 4 (i.e., CDM4), we show an example where this is repeated once within one PRB in the frequency axis (i.e., using 4 REs for 4 DMRS antenna ports within one PRB). However, the specific symbol index within the slot for DMRS REs in FIG. 9(b) and the position of the subcarrier within the PRB are not limited and may be determined by a pre-fixed position or a position signaled by the base station.

As in the example of Figure 9(c), when the DMRS mapping pattern is repeated twice within one PRB, the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 2 REs. You can.

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

As in the example of Figure 9(d), when the DMRS mapping pattern is repeated three times within one PRB, the DMRS overhead can be expressed as 1 PRB and 3 RE per 1 port (i.e., 3RE per 1port and 1PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 12 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 3 REs. You can.

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

Using the basic pattern shown in FIGS. 9(b) to 9(d), additional DMRS can be mapped to the back of the slot considering the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 97 7-1 doesn't exist 98 7-2 doesn't exist 99 7-3 doesn't exist 100 7-1 7-1 101 7-1 7-2 102 7-1 7-3 103 7-2 7-1 104 7-2 7-2 105 7-2 7-3 106 7-3 7-1 107 7-3 7-2 108 7-3 7-3

The examples of FIGS. 9(e) and 9(f) correspond to DMRS pattern examples 106 and 108 in Table 20, respectively. Figure 10 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure. The examples in FIG. 10 may correspond to specific examples similar to the DMRS pattern shown in FIG. 2(d). That is, in the DMRS pattern of FIG. 10, CDM groups #A, #B, and #C, which are distinguished by FDM, can be basically mapped to the first and second symbols. First, the OCC mapping method will be described with reference to FIG. 10(a).

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

In this way, applying Case #1 and Case #2 alternately in the frequency direction can be a problem in power balance when only the same OCC values (e.g., a and b) are mapped on one symbol. This is to allow different OCC values, a and b, and c and d, to be alternately mapped to one symbol.

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

To explain the differences between OCC mapping methods A, B, C, and D based on case #1, OCC mapping method A first maps OCC values a and b in the time axis direction, and then fills them in the time axis direction. This is a method of mapping OCC values c and d, and OCC mapping method B is a method of first mapping OCC values a and b in the direction of the frequency axis, and then mapping OCC values c and d in the direction of the frequency axis from the time resource. , OCC mapping method C is a method that maps OCC values a, b, c, and d clockwise starting from the time and frequency resource with the lowest index value, and OCC mapping method D is the time and frequency resource with the lowest index value. This is a method that maps OCC values a, b, c, and d starting from the frequency resource in a counterclockwise direction.

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

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

For example, for DMRS antenna port #1 of CDM group #A, OCC of +1, +1, +1, +1 is applied across the four REs in the frequency direction, and DMRS antenna port # of CDM group #A For 2, OCC of +1, -1, +1, -1 is applied across the four REs in the frequency direction, and for DMRS antenna port #3 of CDM group #A, +1 is applied across the four REs in the frequency direction. , OCC of +1, -1, -1 is applied, and for DMRS antenna port #4 of CDM group #A, OCC of +1, -1, -1, -1 is applied across four REs in the frequency direction. Each CDM group can be configured by repeating once (Figure 10(b)) or repeating twice (Figure 10(c)) within one PRB on the frequency axis. In Figure 10(b) As an example, if the DMRS mapping pattern is repeated once within one PRB, the DMRS overhead can be expressed as 1 PRB and 1 RE per 1 port (i.e., 1RE per 1port and 1PRB). That is, in one PRB, one CDM group is mapped to a total of 4 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having as much overhead as 1 RE. You can. In Figure 10(b), each CDM group is an OCC of length-4 on the time axis for a total of 4 REs on two continuous or discontinuous subcarriers per symbol within two consecutive or discontinuous symbols. By applying CDM (i.e., CDM4), this only shows an example of repeating once within one PRB in the frequency axis (i.e., using 4 REs for 4 DMRS antenna ports within one PRB). The specific symbol index within the slot for the DMRS REs of 10(b) and the position of the subcarrier within the PRB are not limited and may be determined as a pre-fixed position or a position signaled by the base station.

If the DMRS mapping pattern is repeated twice within one PRB, as shown in the example of Figure 10(c), the DMRS overhead can be expressed as 1 PRB and 2 RE per 1 port (i.e., 2RE per 1 port and 1 PRB). there is. That is, in one PRB, one CDM group is mapped to a total of 8 REs, and one CDM group includes 4 DMRS antenna ports, so one DMRS antenna port can be expressed as having an overhead equal to 2 REs. You can.

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

Using the basic pattern shown in FIGS. 10(b) and 10(c), additional DMRS can be mapped to the back of the slot to take into account the high Doppler scenario.

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

DMRS pattern embodiment basic pattern
(front part of slot) additional patterns
(behind the slot) 109 8-1 doesn't exist 110 8-2 doesn't exist 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 DMRS pattern examples 113 and 114 in Table 22, respectively. As an additional example, based on patterns 8-1 and 8-2, a DMRS according to the basic pattern is mapped to the front part of time within one slot, as shown in Table 23 below, and the first additional pattern is mapped to the back part of time within the same slot. And the DMRS may be mapped according to the second additional pattern.

DMRS pattern embodiment basic pattern
(front part of slot) 1st additional pattern
(behind the slot) 2nd additional pattern
(behind the slot) 115 8-1 doesn't exist doesn't exist 116 8-2 doesn't exist doesn't exist 117 8-1 8-1 doesn't exist 118 8-1 8-2 doesn't exist 119 8-2 8-1 doesn't exist 120 8-2 8-2 doesn't exist 121 8-1 8-1 8-1 122 8-1 8-1 8-2 123 8-1 8-2 8-1 124 8-1 8-2 8-2 125 8-2 8-1 8-1 126 8-2 8-1 8-2 127 8-2 8-2 8-1 128 8-2 8-2 8-2

The examples of FIGS. 10(f) and 10(g) correspond to DMRS pattern examples 125 and 128 in Table 23, respectively. In the examples of the DMRS pattern described above, up to 12 DMRS antenna ports are divided into up to 6 or 3 CDM groups, and if the DMRS antenna port overhead is 1 PRB and 1 RE per port, 1 PRB and 1 port In the case of 2RE per port, the DMRS pattern can be determined depending on the case of 1 PRB and 3RE per port. Additionally, additional patterns may be applied within one slot. In the following, examples of the present disclosure for a method of indicating a DMRS pattern, that is, a method of a base station signaling configuration information about a DMRS pattern to a terminal, will be described. . First, the factors to be considered for DMRS pattern indication are: i) basic pattern overhead (including the presence or absence of a basic pattern), ii) additional pattern overhead (including the presence or absence of an additional pattern), iii) RE position within the slot of the basic pattern (i.e., symbol location and/or subcarrier location), iv) RE location within the slot of the additional pattern (i.e., symbol location and/or subcarrier location), v) virtual cell identifier.

First, i) the basic pattern overhead signaling method will be described.

DMRS can be transmitted together in the slot where the physical channel requiring demodulation is transmitted, but if DMRS bundling is applied in the time domain, some slots are slots where the physical channel is transmitted, but the DMRS basic pattern may not exist. there is. DMRS bundling can be said to demodulate the physical channel in a plurality of slots based on channel information estimated using DMRS transmitted in one of a plurality of slots.

For example, based on examples such as FIGS. 3, 5, 7, and 9, the overhead of the DMRS basic pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: when the DMRS basic pattern does not exist, or when the DMRS basic pattern exists and has the maximum overhead. For example, if the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (zero) (i.e., DMRS does not exist in the corresponding slot). If the bit value is 1, it may indicate that the basic pattern DMRS overhead is 3 (that is, the CDM group of the basic pattern is repeated 3 times in one PRB).

As an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS basic pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: when the DMRS basic pattern does not exist, or when the DMRS basic pattern exists and has the maximum overhead. For example, if the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (zero) (i.e., DMRS does not exist in the corresponding slot). If the bit value is 1, it may indicate that 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, based on examples such as FIGS. 3, 5, 7, and 9, the overhead of the DMRS basic pattern can be signaled using information of 2 bits. For example, it may indicate that the DMRS basic pattern does not exist or a specific value of DMRS overhead. For example, if the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (zero) (i.e., DMRS does not exist in the corresponding slot). If the bit value is 1, it may 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, it may indicate that the basic pattern DMRS overhead is 2 (i.e., the CDM group of the basic pattern is repeated twice in one PRB). If the bit value is 3, it may indicate that the basic pattern DMRS overhead is 3 (that is, the CDM group of the basic pattern is repeated 3 times in one PRB).

As an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS basic pattern can be signaled using information of 2 bits. For example, it may indicate that the DMRS basic pattern does not exist or a specific value of DMRS overhead. For example, if the bit value is 0, it may indicate that the basic pattern DMRS overhead is 0 (zero) (i.e., DMRS does not exist in the corresponding slot). If the bit value is 1, it may 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, it may indicate that the basic pattern DMRS overhead is 2 (i.e., the CDM group of the basic pattern is repeated twice in one PRB). Bit value 3 may be reserved.

Next, ii) the additional pattern overhead signaling method will be described.

If the DMRS basic pattern does not exist in a certain slot, additional patterns may not exist either. Additionally, if a high Doppler scenario is not considered, additional patterns may not exist in a slot where a DMRS basic pattern exists.

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

As an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS additional pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: when no DMRS additional pattern exists, or when a DMRS additional pattern exists and has maximum overhead. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (i.e., the first and second additional DMRS patterns do not exist in the corresponding slot). . When 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, it can indicate that the CDM group of the second additional pattern is repeated twice in one PRB.

As another example, based on examples such as FIGS. 3, 5, 7, and 9, the overhead of the DMRS additional pattern can be signaled using information of 2 bits. For example, it may indicate that no DMRS additional pattern exists, or a specific value of the overhead of the DMRS additional pattern. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (that is, there is no additional DMRS pattern in the corresponding slot). If the bit value is 1, it may indicate that the additional pattern DMRS overhead is 1 (i.e., the CDM group of the additional pattern is repeated once in one PRB). If the bit value is 2, it 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). If the bit value is 3, it may indicate that the additional pattern DMRS overhead is 3 (i.e., the CDM group of the additional pattern is repeated 3 times in one PRB).

As an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS additional pattern can be signaled using information of 3 bits. For example, it may indicate that no DMRS additional pattern exists, or a specific value of the overhead of the DMRS additional pattern. For example, if the bit value is 0, it can indicate that the additional pattern DMRS overhead is 0 (zero) (i.e., neither the first DMRS additional pattern nor the second additional pattern exists in the corresponding slot). there is. 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 once in one PRB), and the second additional pattern DMRS overhead is 0 ( That is, it may indicate that the second DMRS additional pattern does not exist in the corresponding slot. When 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, it may indicate that the second DMRS additional pattern does not exist in the corresponding slot. When 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 once in one PRB), and the second additional pattern DMRS overhead is 1 ( That is, it may indicate that the CDM group of the second additional pattern is repeated once in one PRB. When 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, it may indicate that the CDM group of the second additional pattern is repeated once in one PRB. If the bit value is 5, the first additional pattern DMRS overhead is 2 (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, it may indicate that the CDM group of the second additional pattern is repeated twice in one PRB. Bit values 6 and 7 may be reserved.

The above example assumes that the overhead of the second additional pattern is set to be less than or equal to the overhead of the first additional pattern (i.e., the overhead of the second additional pattern is not greater than the overhead of the first additional pattern). will be. If we assume that the overhead of the second additional pattern is always 0, the overhead of the first additional pattern can be indicated using only bit values 0, 1, and 2.

As another example, based on examples such as FIGS. 3, 5, 7, and 9, the overhead of the DMRS additional pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: a case where a DMRS additional pattern does not exist, or a case where a DMRS additional pattern does exist and has a certain non-maximum overhead. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (that is, there is no additional DMRS pattern in the corresponding slot). If the bit value is 1, it 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 an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS additional pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: a case where a DMRS additional pattern does not exist, or a case where a DMRS additional pattern does exist and has a certain non-maximum overhead. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (i.e., the first and second additional DMRS patterns do not exist in the corresponding 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 once in one PRB), and the second additional pattern DMRS overhead is 1 ( That is, it can indicate that the CDM group of the second additional pattern is repeated once in one PRB.

As another example, based on examples such as FIGS. 3, 5, 7, and 9, the overhead of the DMRS additional pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: a case where a DMRS additional pattern does not exist, or a case where a DMRS additional pattern does exist and has a certain non-maximum overhead. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (that is, there is no additional DMRS pattern in the corresponding slot). If the bit value is 1, it may indicate that the additional pattern DMRS overhead is 1 (i.e., the CDM group of the additional pattern is repeated once in one PRB).

As an additional example, based on examples such as FIGS. 4, 6, 8, and 10, the overhead of the DMRS additional pattern can be signaled using information of 1 bit size. For example, two cases can be indicated: a case where a DMRS additional pattern does not exist, or a case where a DMRS additional pattern does exist and has a certain non-maximum overhead. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (i.e., the first and second additional DMRS patterns do not exist in the corresponding 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 once in one PRB), and the second additional pattern DMRS overhead is 0 ( That is, it can indicate that the second additional pattern does not exist.

Next, iii) a method for signaling the RE location (i.e., symbol location and/or subcarrier location) within the slot of the basic pattern will be described.

In order to signal the RE location of the basic pattern, the location of the control area within the slot (i.e., the RE location to which the control channel is mapped), the overhead of the DMRS basic pattern, and the location of the data area within the slot (i.e., the RE location to which the data channel is mapped). Considering location), etc., candidate locations to which the DMRS basic pattern can be mapped can be determined. It can be signaled which location among these candidate locations is used. If there is only one candidate location, the terminal can know the RE location of the basic pattern even if it is not signaled. The RE location of this basic pattern may be indicated based on a symbol index value and/or a subcarrier index value.

Next, iv) a method for signaling the RE location (i.e., symbol location and/or subcarrier location) within the slot of the additional pattern will be described.

In order to signal the RE location of the additional pattern, the location of the DMRS basic pattern, the overhead of the additional pattern, the data area location (e.g., the downlink data channel transmission section and location in TDD (Time Division Duplex) settings), etc. Considering , candidate locations to which the DMRS additional pattern can be mapped can be determined. It can be signaled which location among these candidate locations is used. If there is only one candidate location, the terminal can know the RE location of the basic pattern even if it is not signaled. The RE position of this basic pattern may be indicated based on a symbol index value and/or a subcarrier index value, or may be defined as a value relative to the position of the basic pattern.

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

Unlike the physical layer identifier (Physical ID) of a cell, a virtual cell identifier (virtual cell ID, VCID) can be set for cooperative transmission with other cells (e.g., CoMP (Coordinated Multi-Point) transmission). . Two or three or more such VCIDs may be set. For example, during CoMP operation, VCID for TRPs (Transmission Reception Points) that share the same cell-specific ID or group-specific ID and perform operations based on it, and different cell-specific IDs even if they operate in CoMP or not. Alternatively, VCIDs for TRPs that perform operations based on group-specific IDs may be set. In this case, the base station can inform the UE of the VCID value that will be used for DMRS reception (i.e., used as an initial value for DMRS sequence generation, etc.). In addition, VCID is not an element directly related to DMRS pattern setting, but since the values of DMRS pattern setting elements such as i) to iv) above may be set based on VCID (DMRS pattern setting is determined by each terminal in a MU-MIMO environment) If set for , terminals operating in MU-MIMO can configure the same VCID), the VCID can be said to be an element indirectly related to setting the DMRS pattern.

Below, the signaling method of DMRS pattern setting information will be described.

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

For example, i) setting information about the basic pattern overhead (including the presence or absence of the basic pattern) may be explicitly or implicitly included in the downlink control information (DCI), etc., and may be dynamically indicated. Or, i) setting information about the basic pattern overhead (including the presence or absence of the basic pattern) is explicitly or implicitly included in upper layer signaling (e.g., RRC (Radio Resource Control) layer signaling, etc.) to create a semi-static (semi-static) -static) can also be indicated.

For example, ii) configuration information about additional pattern overhead (including the presence or absence of additional patterns) may be explicitly or implicitly included in the DCI, etc., and may be dynamically indicated. Alternatively, ii) configuration information about additional pattern overhead (including the presence or absence of additional patterns) may be explicitly or implicitly included in upper layer signaling (e.g., RRC signaling, etc.) to indicate semi-statically.

For example, iii) the RE position (i.e., symbol position and/or subcarrier position) within the slot of the basic pattern may not be signaled separately because a predefined fixed value is used. Alternatively, iii) configuration information about the RE location (i.e., symbol location and/or subcarrier location) within the slot of the basic pattern may be explicitly or implicitly included in the DCI, etc. and dynamically indicated. Or, iii) setting information about the RE location (i.e., symbol location and/or subcarrier location) within the slot of the basic pattern is explicitly or implicitly included in higher layer signaling (e.g., RRC signaling, etc.) - It can also be specified statically.

For example, iv) the RE position (i.e., symbol position and/or subcarrier position) within the slot of the additional pattern may not be signaled separately because a predefined fixed value is used. Alternatively, iv) configuration information about the RE position (i.e., symbol position and/or subcarrier position) within the slot of the additional pattern may be explicitly or implicitly included in the DCI, etc. and dynamically indicated. Or, iv) setting information about the RE location (i.e., symbol location and/or subcarrier location) within the slot of the additional pattern is explicitly or implicitly included in higher layer signaling (e.g., RRC signaling, etc.) - It can also be specified statically.

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

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

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

A method of semi-statically configuring signaling set candidates through higher layer signaling may follow what has been described for each element of DMRS configuration information such as i) to v).

Additionally, one of the plurality of signaling set candidates can be dynamically indicated through a 1-bit or 2-bit indicator included in the DCI.

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

Example 1

This embodiment is a method of setting signaling set candidates including elements of i) basic pattern overhead (including the presence or absence of a basic pattern), ii) additional pattern overhead (including the presence or absence of an additional pattern), and v) virtual cell identifier, 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 of dynamically indicating DMRS pattern setting information using 1 bit information included in DCI.

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

In the example of Table 24, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 can each be set through RRC signaling. Basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 can each be set through RRC signaling. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in v) virtual cell identifier signaling method described above, VCID #1 and VCID #2 can each be set through RRC signaling. VCID #1 and VCID #2 may be set to different values or may be set to the same value. Table 25 below shows an example of dynamically indicating DMRS pattern setting information using 2-bit information included in DCI.

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

In the example of Table 25, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value. As described in v) virtual cell identifier signaling scheme above. Likewise, VCID #1, #2, #3, and #4 can each be set through RRC signaling. VCID #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. iii) Within the slot of the basic pattern that is not included in the upper layer signaling set candidate. each of the RE positions (i.e., symbol positions and/or subcarrier positions), and iv) the RE positions (i.e., symbol positions and/or subcarrier positions) within the slot of the additional pattern, individually or independently, carry out DCI or RRC signaling. It can be set through.

Example 2

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

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

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

In the example of Table 26, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 can each be set through RRC signaling. Basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 can each be set through RRC signaling. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set to different values or may be set to the same value. Table 27 below shows an example of dynamically indicating DMRS pattern setting information using 2 bits of information included in DCI.

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

In the example of Table 27, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern overhead #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. iii) Basic not included in the upper layer signaling set candidates Each of the RE positions within the slot of the pattern (i.e. symbol position and/or subcarrier position), iv) the RE position within the slot of the additional pattern (i.e. symbol position and/or subcarrier position), and v) the virtual cell identifier. Can be set individually or independently through DCI or RRC signaling. Example 3

This embodiment includes i) basic pattern overhead (including the presence or absence of the basic pattern), ii) additional pattern overhead (including the presence or absence of the additional pattern), iii) RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position) ), iv) a RE position (i.e., symbol position and/or subcarrier position) within a slot of an additional pattern, and v) a method of setting signaling set candidates including elements of a virtual cell identifier, and selecting any one of the candidates as a DCI It can be dynamically indicated using 1-bit or 2-bit size information included in .

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

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

In the example of Table 28, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 can each be set through RRC signaling. Basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 can each be set through RRC signaling. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned iii) RE position (i.e., symbol position and/or subcarrier position) signaling method within the slot of the basic pattern, basic DMRS pattern position #1 and basic DMRS pattern position #2 are each set through RRC signaling. Basic DMRS pattern position #1 and basic DMRS pattern position #2 may be set to different values or may be set to the same value. As described in the above-mentioned iv) RE position (i.e., symbol position and/or subcarrier position) signaling method within the slot of the additional pattern, additional DMRS pattern position #1 and additional DMRS pattern position #2 are each set through RRC signaling. Additional DMRS pattern location #1 and additional DMRS pattern location #2 may be set to different values or may be set to the same value.

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

Table 29 below shows an example of dynamically indicating DMRS pattern setting information using 2 bits of information included in DCI.

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

In the example of Table 29, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern overheads #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. RE location within the slot of the above-described iii) basic pattern ( That is, symbol position and/or subcarrier position) As described in the signaling scheme, basic DMRS pattern positions #1, #2, #3, and #4 can each be set through RRC signaling. The basic DMRS pattern positions #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. The RE positions within the slots of the additional patterns (i.e. , symbol position and/or subcarrier position) As described in the signaling scheme, additional DMRS pattern positions #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value.

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

Example 4

This embodiment includes i) basic pattern overhead (including the presence or absence of the basic pattern), ii) additional pattern overhead (including the presence or absence of the additional pattern), iii) RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position) ), and iv) a method of setting signaling set candidates including elements of the RE position (i.e., symbol position and/or subcarrier position) within the slot of the additional pattern, and selecting any one of the candidates as 1 bit or It can be indicated dynamically using information of 2 bit size.

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

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

In the example of Table 30, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 can each be set through RRC signaling. Basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 can each be set through RRC signaling. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set to different values or may be set to the same value. As described in the above-mentioned iii) RE position (i.e., symbol position and/or subcarrier position) signaling method within the slot of the basic pattern, basic DMRS pattern position #1 and basic DMRS pattern position #2 are each set through RRC signaling. Basic DMRS pattern position #1 and basic DMRS pattern position #2 may be set to different values or may be set to the same value. As described in the above-mentioned iv) RE position (i.e., symbol position and/or subcarrier position) signaling method within the slot of the additional pattern, additional DMRS pattern position #1 and additional DMRS pattern position #2 are each set through RRC signaling. Additional DMRS pattern location #1 and additional DMRS pattern location #2 may be set to different values or may be set to the same value.

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

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

In the example of Table 31, as described in i) basic pattern overhead signaling method described above, basic DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value. As described in the above-mentioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern overheads #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. RE location within the slot of the above-mentioned iii) basic pattern ( That is, symbol position and/or subcarrier position) As described in the signaling scheme, basic DMRS pattern positions #1, #2, #3, and #4 can each be set through RRC signaling. The basic DMRS pattern positions #1, #2, #3, #4 may be set to different values, or some or all may be set to the same value. The RE positions within the slots of the additional patterns (i.e. , symbol position and/or subcarrier position) As described in the signaling scheme, additional DMRS pattern positions #1, #2, #3, and #4 can each be set through RRC signaling. Additional DMRS pattern positions #1, #2, #3, and #4 may be set to different values, or some or all may be set to the same value.

v) Virtual cell identifiers that are not included in the higher layer signaling set candidates can be set individually or independently through DCI or RRC signaling.

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

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

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

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

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

In step S1150, the base station can map the DMRS on physical resources according to the DMRS pattern corresponding to the indicated signaling set and transmit it to the terminal, and can also transmit a physical channel in the slot where the DMRS is transmitted.

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

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

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

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

The processor 1210 performs baseband-related signal processing and may include an upper layer processing unit 1211 and a physical layer processing unit 1215. The upper layer processing unit 1211 may process operations of a MAC (Medium Access Control) layer, RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit 1215 may process physical (PHY) layer operations (e.g., uplink reception signal processing, downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor 1210 may also control the overall operation of the base station device 1200.

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

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

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

The DMRS pattern configuration information generator 1212 generates a signaling set of configuration information for the DMRS transmitted for demodulation of the physical channel to be transmitted to the terminal (e.g., basic pattern overhead (including the presence or absence of a basic pattern), additional pattern overhead). (with or without additional patterns), RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position), RE position within the slot of the additional pattern (i.e., symbol position and/or subcarrier position), or virtual cell. Candidates (a combination of two or more elements in the identifier) can be determined and instructed to the terminal.

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

The DMRS pattern setting information transmission unit 1216 configures downlink control information (DCI) including DMRS settings assigned to the terminal and transmits it through the transceiver 1230.

For example, the DMRS pattern setting information transmitting unit 1216 includes information indicating 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. The DCI can be transmitted to the terminal.

The DMRS transmission unit 1217 may map the DMRS onto physical resources based on the DMRS settings allocated to the terminal and transmit it through the transceiver 1230.

The physical channel transmission unit 1217 may map a physical channel (eg, a downlink data channel) along with the DMRS transmitted to the terminal onto physical resources and transmit them through the transceiver 1230.

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

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

The antenna unit 1270 may include one or more physical antennas, and may support MIMO transmission and reception when it includes a plurality of antennas. 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, etc., and may also include components such as buffers.

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

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

Based on the upper layer signaling provided from the base station, the DMRS pattern setting information determination unit 1262 sets a signaling set for the DMRS setting (e.g., basic pattern overhead (including the presence or absence of the basic pattern), additional pattern overhead ( (including presence or absence of additional patterns), RE position within the slot of the basic pattern (i.e., symbol position and/or subcarrier position), RE position within the slot of the additional pattern (i.e., symbol position and/or subcarrier position), or virtual cell identifier. It is possible to determine what the candidates are (a combination of two or more elements).

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

For example, the DMRS pattern setting information receiving unit 1266 is a DCI that includes information indicating one of the signaling set candidates of the DMRS pattern setting information determined by the DMRS pattern setting information determination unit 1262 of the upper layer processing unit 1261. can receive.

The DMRS receiver 1267 may receive the DMRS transmitted to it through the transceiver 1280 based on the DMRS settings confirmed through the DMRS setting information receiver 1266.

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

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

Matters described in the examples of the present invention may be equally applied to the operations of the base station device 1200 and the terminal device 1250, and overlapping descriptions will be omitted.

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

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

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

The scope of the present disclosure is software or machine-executable instructions (e.g., operating system, application, firmware, program, etc.) that cause operations according to the methods of various embodiments to be executed on a device or computer, and such software or It includes non-transitory computer-readable medium in which instructions, etc. are stored and can be executed on a device or computer.

Claims (15)

In the device,
one or more processors;
a memory that stores instructions for causing the device to perform specific operations by the one or more processors; and
Includes a wireless transceiver,
The specific operations above are:
Determine a plurality of sets of antenna ports related to demodulation reference signal (DM-RS) transmission, wherein a first code division multiplexing (CDM) group is a first of the plurality of sets of antenna ports. associated with a set, a second CDM group associated with a second set of the plurality of sets of antenna ports, and a third CDM group associated with a third set of the plurality of sets of antenna ports;
Based on a plurality of first orthogonal cover code values, a DM-RS associated with at least one antenna port of the first set for the first CDM group is divided into two adjacent symbols in the time axis and first two adjacent sub symbols in the frequency axis. Map to first adjacent resource elements corresponding to carriers, wherein the plurality of first orthogonal cover code values are:
orthogonal cover code values associated with a first subcarrier of the first two adjacent subcarriers; and
contains orthogonal cover code values associated with a second subcarrier of the first two adjacent subcarriers;
Based on a plurality of second orthogonal cover code values, a DM-RS associated with at least one antenna port of the second set for the second CDM group is transmitted to the two adjacent symbols in the time axis and the second two adjacent symbols in the frequency axis. Map to second adjacent resource elements corresponding to adjacent subcarriers, wherein the plurality of second orthogonal cover code values are:
orthogonal cover code values associated with a first subcarrier of the second two adjacent subcarriers; and
comprise orthogonal cover code values associated with a second subcarrier of the second two adjacent subcarriers; and
Based on a plurality of third orthogonal cover code values, a DM-RS associated with at least one antenna port of the third set for the third CDM group is transmitted to the two adjacent symbols in the time axis and the third two adjacent symbols in the frequency axis. Map to third adjacent resource elements corresponding to adjacent subcarriers, wherein the plurality of third orthogonal cover code values are:
orthogonal cover code values associated with a first subcarrier of the third two adjacent subcarriers; and
comprise orthogonal cover code values associated with a second subcarrier of the third two adjacent subcarriers; and
The wireless transceiver:
the DM-RS associated with at least one antenna port of the first set;
the DM-RS associated with at least one antenna port of the second set; and
Transmitting the DM-RS associated with at least one antenna port of the third set.
According to claim 1,
The apparatus of claim 1, wherein each of the first CDM group, the second CDM group, and the third CDM group is associated with four different antenna ports.
According to claim 1,
The first adjacent resource elements include a first resource element with a symbol index x and a subcarrier index y, a second resource element with a symbol index x and a subcarrier index y+1, and a symbol index x+1 and a subcarrier index y. a third resource element with a symbol index x+1 and a fourth resource element with a subcarrier index y+1, wherein x and y are positive integers,
A device in which a sequence of four orthogonal cover code values for the first resource element, the second resource element, the third resource element, and the fourth resource element is determined differently for each antenna port in the first set.
According to claim 1,
The specific operations above are:
Based on the plurality of first orthogonal cover code values, the DM-RS associated with at least one antenna port of the first set for the first CDM group is divided into two additional adjacent symbols in the time axis and the frequency axis. Map fourth adjacent resource elements corresponding to the first two adjacent subcarriers in
There is at least one symbol between the two adjacent symbols and the additional two adjacent symbols, and
The two adjacent symbols and the additional two adjacent symbols are included in one slot.
According to claim 1,
The DM-RS associated with the at least one antenna port of the first set includes a DM-RS for a physical downlink shared channel (PDSCH), and the DM-RS associated with the at least one antenna port of the first set Transmitting the DM-RS associated with includes transmitting the DM-RS associated with at least one antenna port of the first set from a base station to a wireless user terminal.
According to claim 1,
The DM-RS associated with at least one antenna port of the first set includes a DM-RS for a physical sidelink shared channel (PSSCH), and
Transmitting the DM-RS associated with the at least one antenna port of the first set includes transmitting the DM-RS associated with the at least one antenna port of the first set from one wireless user terminal to another wireless user terminal. device to do.
According to claim 1,
The DM-RS associated with at least one antenna port of the first set includes a DM-RS for a physical uplink shared channel (PUSCH), and
Transmitting the DM-RS associated with the at least one antenna port of the first set includes transmitting the DM-RS associated with the at least one antenna port of the first set from a wireless user terminal to a base station. .
According to claim 1,
At least one of the first adjacent resource elements is adjacent to at least one of the second adjacent resource elements, and
At least one second adjacent resource element is adjacent to at least one third adjacent resource element.
According to claim 1,
The at least one orthogonal cover code comprises an orthogonal cover code of length-2, wherein the orthogonal cover code of length-2 is:
the first two adjacent subcarriers;
the second two adjacent subcarriers; and
Associated with the third two adjacent subcarriers.
According to claim 1,
The orthogonal cover code values associated with the first subcarrier of the first two adjacent subcarriers are:
[+1, +1] associated with the first antenna port of the first set;
[+1, +1] associated with the second antenna port of the first set;
[+1, -1] associated with the third antenna port of the first set; or
and at least one of [+1, -1] associated with the fourth antenna port of the first set.
According to claim 10,
The orthogonal cover code values associated with the second subcarrier of the first two adjacent subcarriers are:
[+1, +1] associated with the first antenna port of the first set;
[-1, -1] associated with the second antenna port of the first set;
[+1, -1] associated with the third antenna port of the first set; or
and at least one of [-1, +1] associated with the fourth antenna port of the first set.
In the device,
one or more processors;
a memory that stores instructions for causing the device to perform specific operations by the one or more processors; and
Including a wireless transceiver,
The specific operations above are:
Determine a plurality of sets of antenna ports related to demodulation reference signal (DM-RS) transmission, wherein a first code division multiplexing (CDM) group is a first of the plurality of sets of antenna ports. associated with a set, a second CDM group associated with a second set of the plurality of sets of antenna ports, and a third CDM group associated with a third set of the plurality of sets of antenna ports;
Orthogonal frequency division multiplexing of the first DM-RS associated with at least one antenna port of the first set for the first CDM group based on at least one first orthogonal cover code with two adjacent orthogonal frequency division multiplexing in the time axis. , OFDM) symbols and mapped to the first four adjacent resource elements corresponding to the first two adjacent subcarriers in the frequency axis, wherein the at least one first orthogonal cover code corresponds to the first two adjacent subcarriers. is related to;
A second DM-RS associated with at least one antenna port of the second set for the second CDM group based on at least one second orthogonal cover code to the two adjacent OFDM symbols in the time axis and in the frequency axis mapping to second four adjacent resource elements corresponding to second two adjacent subcarriers, wherein the at least one second orthogonal cover code is associated with the second two adjacent subcarriers; and
Based on at least one third orthogonal cover code, a third DM-RS associated with at least one antenna port of the third set for the third CDM group is generated between the two adjacent OFDM symbols in the time axis and the frequency axis. mapping to third four adjacent resource elements corresponding to third two adjacent subcarriers, wherein the at least one third orthogonal cover code is related to the third two adjacent subcarriers; and
The wireless transceiver:
the first DM-RS associated with at least one antenna port of the first set;
the second DM-RS associated with at least one antenna port of the second set; and
Transmitting the third DM-RS associated with at least one antenna port of the third set.
According to claim 12,
the at least one first orthogonal cover code is associated with four orthogonal cover values corresponding to the first four adjacent resource elements;
the at least one second orthogonal cover code is associated with four orthogonal cover values corresponding to the second four adjacent resource elements; and
The at least one third orthogonal cover code is associated with four orthogonal cover values corresponding to the third four adjacent resource elements.
According to claim 13,
The four orthogonal cover values corresponding to the first four adjacent resource elements are:
[+1, +1, +1, +1] associated with the first antenna port of the first set;
[+1, -1, +1, -1] associated with the second antenna port of the first set;
[+1, +1, -1, -1] associated with the third antenna port of the first set; or
and at least one of [+1, -1, -1, +1] associated with the fourth antenna port of the first set.
According to claim 12,
After selecting at least one antenna port associated with the first CDM group for DM-RS transmission, antenna ports associated with the second CDM group are configured to be selected for DM-RS transmission, and
The device is configured to select antenna ports associated with the third CDM group for DM-RS transmission after selecting at least one antenna port associated with the second CDM group for DM-RS transmission.