KR102489800B1 - Method and apparatus for transmitting and receiving demodulation reference signal pattern configuration information for nr system - Google Patents

Abstract

The present disclosure relates to a method and apparatus for transmitting or receiving demodulation reference signal pattern setting information for a NR system. In a method for signaling demodulation reference signal (DMRS) pattern setting information in a wireless communication system according to an embodiment of the present disclosure, setting information for signaling set candidates for the DMRS pattern setting information is received from a base station through higher layer signaling. doing; 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 a basic pattern overhead, an additional pattern overhead, a basic pattern location, and an additional pattern location. , or a combination of two or more elements of the virtual cell identifier.

Description

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

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

The International Telecommunication Union (ITU) is developing IMT (International Mobile Telecommunication) frameworks and standards, and recently, discussions for 5G communication are underway 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 considers 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 the demodulation reference signal (DeModulation A method for signaling pattern configuration and pattern configuration information for Reference Signal (DMRS) has not yet been specifically determined.

A technical problem of the present disclosure is to provide a method and apparatus for signaling pattern setting information of a demodulation reference signal supporting an increased number of layers and an increased number of antenna ports.

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

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

A method for signaling demodulation reference signal (DMRS) pattern configuration information in a wireless communication system according to an aspect of the present disclosure includes receiving configuration information for candidates of a signaling set for the DMRS pattern configuration 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 a basic pattern overhead, an additional pattern overhead, a basic pattern location, and an additional pattern location. , or a combination of two or more elements of the virtual cell identifier.

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

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

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

Effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may 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.
2 is a diagram illustrating additional examples of a DMRS pattern according to the present disclosure.
3 to 10 are diagrams illustrating various examples of DMRS patterns in one PRB according to the present disclosure.
11 is a diagram for explaining a DMRS pattern configuration information signaling method according to the present disclosure.
12 is a diagram showing configurations of a base station device and a terminal device according to the present disclosure.

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

In describing the embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. And, in the drawings, parts irrelevant to the description of the present disclosure are omitted, and similar reference numerals are attached to similar parts.

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

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

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

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

The present 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 (for example, a base station) that manages the wireless communication network, or It may be performed in a process of transmitting or receiving a signal from a terminal coupled to a wireless network.

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

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

In the following description, the term NR system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from 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 is a wireless communication supporting a plurality of SCS It is not limited to the system.

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

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

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

For example, the NR system may support applications such as enhanced mobile broadband (eMBB), massive machine type communications (mMTC)/ultra machine type communications (uMTC), and ultra-reliable and low latency communications (URLLC). In particular, the requirement for user plane latency for URLLC or eMBB service 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. It requires significant latency reduction compared to the 10 ms latency requirement of .

In order to satisfy such 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 a plurality of SCSs.

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

In such an NR system, a demodulation reference signal (DMRS) for demodulation of a specific physical channel is required. For example, a DMRS for demodulation of a physical data channel and a DMRS for demodulation of a physical control channel 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. It can support orthogonal layers. These layers are mapped to antenna ports (ie, logical antennas) and can be transmitted through physical channels. Here, in order to correctly demodulate a signal transmitted through each layer or antenna port of a physical channel, a reference signal for a corresponding layer or antenna port is required, which may be referred to as DMRS.

In the present disclosure, in order to support an increased number of layers and an increased number of antenna ports in an NR system, DMRS mapping time-frequency resources are 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 instructing each UE of the DMRS configuration by the base station will be described.

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

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

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

When the number of DMRS layers assignable to each UE is 16, each layer may correspond to a distinct combination of antenna port and sequence type. Sequence types can be distinguished by the value of a scrambling ID (SCID) used to generate a sequence used in 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. An antenna port-SCID combination for DMRS may be defined, for example, as shown in Table 1 below, and each of the 16 layers may correspond to one combination.

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

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

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

Hereinafter, examples of DMRS patterns for NR systems 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, a DMRS mapping resource is defined in units of a physical resource block (PRB) 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 SCS in the time domain. Also, a physical resource unit corresponding to one symbol and one subcarrier is referred to as one resource element (RE). Accordingly, one PRB may include 7*12 REs or 14*12 REs according to the SCS.

The DMRS for the NR system can basically be placed in one or two consecutive OFDM symbols in the front part in time within one slot, and an additional DMRS (for example, the need to support a channel that changes rapidly in time due to a fast moving speed) DMRS) used when there is may be placed later in time of one slot.

This additional DMRS may be applied to a high Doppler scenario, and may have the same or lower density in the frequency domain than the previous DMRS in the slot.

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

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

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

In the example of FIG. 1, 12 DMRS antenna ports are configured with 6 code division multiplexing (CDM) 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 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 a frequency division multiplexing (FDM) method by being mapped to different subcarriers, or multiplexed in a time division multiplexing (TDM) method by being mapped to different OFDM symbols. or multiplexed by FDM and TDM schemes by being mapped on different subcarriers and different OFDM symbols. Two DMRS antenna ports belonging to one same CDM group can be distinguished by an orthogonal cover code (OCC). there is. An OCC of length 2 may be used to distinguish two antenna ports. Also, OCC may be applied in the time domain or in the frequency domain. For example, a length-2 OCC may be applied over 2 OFDM symbols or may be applied over 2 subcarriers.

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

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

In addition, FIG. 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 the symbol index l, and they can be distinguished from each other using the FDM method. CDM groups #C and #D are mapped to the symbol index l+1, and they can be distinguished from each other by the FDM method. CDM groups #E and #F are mapped to the symbol index l+l', and they can be distinguished from each other by the FDM method.

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

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

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

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

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

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

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

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

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

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

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

The example of FIG. 2 shows a case in which 12 DMRS antenna ports are composed of 3 CDM groups. For example, as shown in Table 3 below, 4 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 by FDM method by being mapped to different subcarriers, or may be multiplexed by TDM method by being mapped to different OFDM symbols. By being mapped onto an OFDM symbol, it can be multiplexed in FDM and TDM schemes. Four DMRS antenna ports belonging to one same CDM group can be distinguished by OCC. An OCC of length 4 may be used to distinguish 4 antenna ports. Also, OCC may be applied in the time domain, applied in the frequency domain, or applied in the time-frequency domain. For example, a length-4 OCC may be applied over four OFDM symbols, applied over four subcarriers, or applied over two OFDM symbols and two subcarriers.

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

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

In addition, FIG. 2(a) shows an example in which an 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 3 times within one PRB on the frequency axis. That is, the maximum overhead occupied by one port in one PRB can be said to be three REs.

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

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

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

That is, CDM group #A, CDM group #B, and CDM group #C are each configured at symbol index l, and may be additionally configured at symbol index l+1 according to overhead. Alternatively, CDM group #A is configured to repeat once or twice depending on overhead only on symbol index l, CDM group #C is configured to repeat once or twice depending on overhead only on symbol index l+1, and CDM group #C may be configured only at symbol index l or at 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. That is, the maximum overhead occupied by one port in one PRB can be said to be two REs.

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

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

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

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

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

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

Hereinafter, more specific examples of the DMRS pattern according to the present disclosure will be described. In examples of DMRS patterns described below, in one slot (eg, n-th slot) in the time domain and one PRB (eg, m-th PRB) corresponding to 12 subcarriers in the frequency domain. Indicates the DMRS pattern. An exemplary 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, and a total of six CDM groups are mapped to a total of 12 DMRS antenna ports, as in the examples of FIG. can be configured.

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

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

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

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

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

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

When the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

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

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

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

When the DMRS mapping pattern is repeated 3 times within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of six REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having an overhead of three REs. can

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

Using the basic patterns shown in FIGS. 3(b) to 3(d), an additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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

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

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

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

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

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

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

* If the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. can That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

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

If the DMRS mapping pattern is repeated twice within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as two REs. can

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

Using the basic pattern as shown in FIGS. 4(b) and 4(c), an additional DMRS may be mapped to a later part of the slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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

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

DMRS Pattern Example 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

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

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

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

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

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

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

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

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

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

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

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

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

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

If the DMRS mapping pattern is repeated 3 times within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of six REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having an overhead of three REs. can

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

Using the basic patterns shown in FIGS. 5(b) to 5(d), an additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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

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

The examples of FIG. 6 may correspond to specific examples similar to the DMRS pattern 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 the FDM method, may be basically mapped to the first and second symbols.

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

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

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

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

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

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

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

When the DMRS mapping pattern is repeated once within one PRB as in the example of FIG. there is. That is, since one CDM group is mapped to a total of two REs in one PRB, and one CDM group includes two DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

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

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

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

Using the basic pattern shown in FIGS. 6(b) and 6(c), an additional DMRS may be mapped to a later part of the slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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 embodiments 49 and 50 of Table 12, respectively. As an additional example, based on patterns 4-1 and 4-2, as shown in Table 13 below, a DMRS according to a basic pattern is mapped to an earlier part in time within one slot, and a first additional pattern is mapped to a later part in time within the same slot. And DMRS according to the second additional pattern may be mapped.

DMRS Pattern Example 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 embodiments 61 and 64 of Table 13, respectively. 7 to 10 described below, 4 DMRS antenna ports are mapped to one CDM group as in the examples of FIG. 2 and Table 3, and a total of 3 CDM groups are mapped to a total of 12 DMRS antenna ports. can be configured.

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

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

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

As shown in FIG. 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 (eg, having the lowest subcarrier index) RE), apply a as the OCC value, apply b as the OCC value to the second RE (e.g., the RE with the second lowest subcarrier index), and apply b as the OCC value to the third RE (e.g., the RE with the 3rd lowest subcarrier index). c may be applied as an OCC value to the RE having the lowest subcarrier index), and d may be applied as the OCC value to the fourth RE (eg, the RE having the highest subcarrier index).

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

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

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

When the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes four DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

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

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

In FIG. 7(c), each CDM group applies CDM (ie, CDM4) by OCC of length-4 in the frequency axis to 4 consecutive or discontinuous REs in the frequency axis within one symbol, which is In the frequency axis, only showing an example of repeating twice within one PRB (ie, using 8 REs for 4 DMRS antenna ports within one PRB), The specific symbol index and the location of the subcarrier within the PRB are not limited, and may be determined as a pre-fixed location or a location signaled by the base station.

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

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

7(b) to 7(d), an additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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 embodiments 74 and 76 of Table 15, respectively. 8 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 8 may correspond to specific examples similar to the DMRS pattern 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 by the FDM method, may be basically mapped to the first symbol. Alternatively, in the DMRS pattern of FIG. 8, basically, CDM groups #A, #B, and #C classified by the FDM method are mapped to the first symbol, and CDM groups #A, which are classified by the FDM method to the second symbol. #B and #C may be mapped. In this way, each CDM group may be mapped to only the first symbol or to both the first symbol and the second symbol according to overhead.

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

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

As shown in FIG. 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 (eg, having the lowest subcarrier index) RE), apply a as the OCC value, apply b as the OCC value to the second RE (e.g., the RE with the second lowest subcarrier index), and apply b as the OCC value to the third RE (e.g., the RE with the 3rd lowest subcarrier index). c may be applied as an OCC value to the RE having the lowest subcarrier index), and d may be applied as the OCC value to the fourth RE (eg, the RE having the highest subcarrier index).

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

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

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

If the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes four DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

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

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

In FIG. 8(c), each CDM group applies CDM (ie, CDM4) by OCC of length-4 in the frequency axis to 4 consecutive or discontinuous REs in the frequency axis within one symbol, which is In the frequency axis, only showing an example of repeating twice within one PRB (ie, using 8 REs for 4 DMRS antenna ports within one PRB), The specific symbol index and the location of the subcarrier within the PRB are not limited, and may be determined as a pre-fixed location or a location signaled by the base station.

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

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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 embodiments 81 and 82 of Table 17, respectively. As an additional example, based on patterns 6-1 and 6-2, as shown in Table 18 below, a DMRS according to a basic pattern is mapped to an earlier part in time within one slot, and a first additional pattern is mapped to a later part in time within the same slot. And DMRS according to the second additional pattern may be mapped.

DMRS Pattern Example 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 embodiments 93 and 96 of Table 18, respectively. 9 is a diagram showing an additional example of a DMRS pattern in one PRB according to the present disclosure.

The examples of FIG. 9 may correspond to specific examples similar to the DMRS pattern shown in FIG. 2(c). That is, in the DMRS pattern of FIG. 9, CDM groups #A and #B, which are distinguished by the FDM method, are basically mapped to the first and second symbols, and CDM group #C may 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 of FIG. 9 (a), case #1 for a total of four REs on the time axis and frequency axis within two symbols to which each CDM group is mapped. The mapping method and the mapping method of Case # 2 may be alternately applied in the frequency direction. The OCC mapping in the first symbol of case #1 is the same as the OCC mapping in the second symbol in case #2, and the OCC mapping in the second symbol in case #1 is the same as in the first symbol in case #2. It may be the same as OCC mapping.

Since case #1 and case #2 are alternately applied in the frequency direction in this way, power balance may be a problem when only the same OCC values (eg, a and b) are mapped on one symbol, This is to alternately map different OCC values a and b and c and d 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, and the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the iteration index, and case #2 may be applied in the odd repetition index.

If the differences between OCC mapping methods A, B, C, and D are explained based on case #1, OCC mapping method A first maps and fills OCC values a and b in the time axis direction, then from the next frequency resource to the time axis direction. A method of mapping OCC values c and d, and OCC mapping method B is a method of mapping OCC values a and b first in the direction of the frequency axis and then mapping OCC values c and d in the direction of the frequency axis in the next time resource, , OCC mapping method C is a method of mapping OCC values a, b, c, and d in a clockwise direction starting from time and frequency resources having the lowest index values, and OCC mapping method D is a method of mapping time and frequency resources having the lowest index values and This is a method of mapping OCC values a, b, c, and d in a counterclockwise direction starting from a frequency resource.

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

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

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

When the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes four DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

In FIG. 9(b), each CDM group is length-in terms of time axis and frequency axis for a total of 4 REs on 2 consecutive or discontinuous subcarriers per symbol within 2 consecutive or discontinuous symbols. Applying CDM with OCC of 4 (i.e., CDM4), which will be repeated once within one PRB in the frequency axis (i.e., using 4 REs for 4 DMRS antenna ports within one PRB) will be shown as an example. However, the specific symbol index in the slot for the DMRS REs of FIG. 9 (b) and the position of the subcarrier in the PRB are not limited, and may be determined as a pre-fixed position or a position signaled by the base station.

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

In FIG. 9(c), each CDM group is length-in terms of time axis and frequency axis for a total of 4 REs on 2 consecutive or discontinuous subcarriers per symbol within 2 consecutive or discontinuous symbols. Apply CDM with OCC of 4 (i.e., CDM4), which will be repeated 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 in the slot for the DMRS REs of FIG. 9 (c) and the position of the subcarrier in the PRB are not limited, and may be determined as a pre-fixed position or a position signaled by the base station.

When the DMRS mapping pattern is repeated 3 times within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of 12 REs in one PRB, and one CDM group includes four DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as three REs. can

In FIG. 9(d), each CDM group has an OCC of length -4 in the time axis for a total of 4 REs on 2 consecutive or discontinuous subcarriers per symbol within 2 consecutive or discontinuous symbols. Applying CDM (i.e., CDM4) by , which is repeated three times within one PRB in the frequency axis (i.e., using 12 REs for 4 DMRS antenna ports within one PRB), FIG. The specific symbol index in the slot for the DMRS REs of 9(d) and the position of the subcarrier in the PRB are not limited, and may be determined as a previously fixed position or a position signaled by the base station.

9(b) to 9(d), an additional DMRS may be mapped to a later part of a slot in consideration of a high Doppler scenario.

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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

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

The examples of FIG. 10 may correspond to specific examples similar to the DMRS pattern shown in FIG. 2(d). That is, in the DMRS pattern of FIG. 10, CDM groups #A, #B, and #C classified by FDM method may 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 of FIG. 10 (a), case #1 for a total of four REs on the time axis and frequency axis within two symbols to which each CDM group is mapped. The mapping method and the mapping method of Case # 2 may be alternately applied in the frequency direction. The OCC mapping in the first symbol of case #1 is the same as the OCC mapping in the second symbol in case #2, and the OCC mapping in the second symbol in case #1 is the same as in the first symbol in case #2. It may be the same as OCC mapping.

Since case #1 and case #2 are alternately applied in the frequency direction in this way, power balance may be a problem when only the same OCC values (eg, a and b) are mapped on one symbol, This is to alternately map different OCC values a and b and c and d 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, and the index of each repetition is 0, 1, ..., C-1, even-numbered Case #1 may be applied in the iteration index, and case #2 may be applied in the odd-numbered iteration index.

If the differences between OCC mapping methods A, B, C, and D are explained based on case #1, OCC mapping method A first maps and fills OCC values a and b in the time axis direction, then from the next frequency resource to the time axis direction. A method of mapping OCC values c and d, and OCC mapping method B is a method of mapping OCC values a and b first in the direction of the frequency axis and then mapping OCC values c and d in the direction of the frequency axis in the next time resource, , OCC mapping method C is a method of mapping OCC values a, b, c, and d in a clockwise direction starting from time and frequency resources having the lowest index values, and OCC mapping method D is a method of mapping time and frequency resources having the lowest index values and This is a method of mapping OCC values a, b, c, and d in a counterclockwise direction starting from a frequency resource.

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

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

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

If the DMRS mapping pattern is repeated once within one PRB, as in the example of FIG. there is. That is, since one CDM group is mapped to a total of four REs in one PRB, and one CDM group includes four DMRS antenna ports, one DMRS antenna port is expressed as having overhead as much as one RE. can

In FIG. 10(b), each CDM group has an OCC of length -4 in the time axis for a total of 4 REs on 2 consecutive or discontinuous subcarriers per symbol within 2 consecutive or discontinuous symbols. Applying CDM (i.e., CDM4) by , which 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), FIG. The specific symbol index in the slot for DMRS REs of 10(b) and the position of the subcarrier in the PRB are not limited, and may be determined as a previously fixed position or a position signaled by the base station.

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

In FIG. 10(c), each CDM group has an OCC of length -4 in the time axis for a total of 4 REs on 2 consecutive or discontinuous subcarriers per symbol within 2 consecutive or discontinuous symbols. Applying CDM (i.e., CDM4) by , which shows an example of repeating twice within one PRB in the frequency axis (ie, using 8 REs for 4 DMRS antenna ports within one PRB), FIG. The specific symbol index in the slot for DMRS REs of 10(c) and the position of the subcarrier in the PRB are not limited, and may be determined as a previously fixed position or a position signaled by the base station.

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

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

DMRS Pattern Example basic pattern
(front part of slot) additional pattern
(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

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

DMRS Pattern Example 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 embodiments 125 and 128 of Table 23, respectively. In the examples of the DMRS pattern described above, when up to 12 DMRS antenna ports are divided into up to 6 or 3 CDM groups, and DMRS antenna port overhead is 1 PRB and 1 RE per port, 1 PRB and 1 port In the case of 2 REs per port, a DMRS pattern may be determined according to the case of 1 PRB and 3 REs per port. Also, an additional pattern may be applied within one slot.

Hereinafter, examples of the present disclosure for a method of indicating a DMRS pattern, that is, a method of signaling configuration information on a DMRS pattern from a base station 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 the basic pattern), ii) additional pattern overhead (including the presence or absence of additional patterns), iii) RE location in the slot of the basic pattern (i.e., symbol position and/or subcarrier position), iv) RE position in the slot of the additional pattern (ie, symbol position and/or subcarrier position), v) virtual cell identifier.

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

DMRS can be transmitted together in slots where physical channels that require demodulation are transmitted. However, if DMRS bundling is applied in the time domain, some slots are slots where physical channels are transmitted, but the DMRS basic pattern may not exist. there is. DMRS bundling can be referred to as demodulation of a physical channel in a plurality of slots based on channel information estimated by using a DMRS transmitted in one of a plurality of slots.

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

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

As another example, based on the examples of FIGS. 3, 5, 7, and 9, the overhead of the DMRS basic pattern may be signaled using 2-bit information. For example, it may indicate that no DMRS basic pattern exists 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) (ie, 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 (ie, that 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 (ie, 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 (ie, the CDM group of the basic pattern is repeated three times in one PRB).

As an additional example, based on the examples of FIGS. 4, 6, 8, and 10, the overhead of the DMRS basic pattern may be signaled using 2-bit information. For example, it may indicate that no DMRS basic pattern exists 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) (ie, 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 (ie, that 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 (ie, the CDM group of the basic pattern is repeated twice in one PRB). Bit value 3 may be reserved.

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

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

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

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

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

As an additional example, based on the examples of FIGS. 4, 6, 8, and 10, the overhead of the DMRS addition pattern may be signaled using 3-bit information. For example, it may indicate that the DMRS addition pattern does not exist or a specific value of the overhead of the DMRS addition pattern. For example, if the bit value is 0, it may indicate that the additional pattern DMRS overhead is 0 (zero) (that is, that neither the first additional DMRS pattern nor the second additional pattern exist in the corresponding slot). there is. If the bit value is 1, the first additional pattern DMRS overhead is 1 (ie, 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, that the DMRS second additional pattern does not exist in the corresponding slot) may be indicated. If the bit value is 2, the first additional pattern DMRS overhead is 2 (ie, 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, that the DMRS second additional pattern does not exist in the corresponding slot) may be indicated. If the bit value is 3, the first additional pattern DMRS overhead is 1 (ie, 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, the CDM group of the second additional pattern is repeated once in one PRB). If the bit value is 4, the first additional pattern DMRS overhead is 2 (ie, the CDM group of the first additional pattern is repeated twice in one PRB) and the second additional pattern DMRS overhead is 1 ( That is, the CDM group of the second additional pattern is repeated once in one PRB). If the bit value is 5, the first additional pattern DMRS overhead is 2 (ie, the CDM group of the first additional pattern is repeated twice in one PRB), and the second additional pattern DMRS overhead is 2 ( That is, the CDM group of the second additional pattern is repeated twice in one PRB). Bit values 6 and 7 may be reserved.

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

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

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

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

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

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

In order to signal the RE location of the base pattern, the location of the control region within the slot (ie, the RE location to which the control channel is mapped), the overhead of the DMRS basic pattern, and the location of the data region within the slot (ie, the RE location to which the data channel is mapped) position), etc., candidate positions to which the DMRS basic pattern can be mapped may be determined. It may signal which of these candidate positions is used. If the number of candidate positions is only one, the UE can know the RE position of the basic pattern even if it is not signaled. The RE 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 RE locations (ie, symbol locations and/or subcarrier locations) within a slot of an 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 location of the data area (eg, downlink data channel transmission period and location in TDD (Time Division Duplex) configuration), etc. Considering, candidate locations to which the DMRS additional pattern can be mapped can be determined. It may signal which of these candidate positions is used. If the number of candidate positions is only one, the UE can know the RE position of the basic pattern even if it is not signaled. The RE location of the base 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 base pattern location.

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

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

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

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

For example, i) configuration information for basic pattern overhead (including the presence or absence of a basic pattern) may be explicitly or implicitly included in downlink control information (DCI) to be dynamically instructed. Alternatively, i) by explicitly or implicitly including configuration information on the base pattern overhead (including the presence or absence of the base pattern) in higher layer signaling (eg, Radio Resource Control (RRC) layer signaling, etc.) -static) can also be specified.

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

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

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

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

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

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

A method of semi-statically configuring signaling set candidates through higher layer signaling may follow the description of each element of DMRS configuration information such as i) to v).

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

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

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 presence or absence of an additional pattern), and v) virtual cell identifier, Any one of the candidates may be dynamically indicated using 1-bit or 2-bit information included in 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 may be set through RRC signaling, respectively. Different values or the same value may be set for basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2. As described in the aforementioned ii) additional pattern overhead signaling scheme, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set through RRC signaling, respectively. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may have different values or the same value.

As described in v) virtual cell identifier signaling method described above, VCID #1 and VCID #2 may be set through RRC signaling, respectively. VCID #1 and VCID #2 may have different values or 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 the aforementioned i) basic pattern overhead signaling method, basic DMRS pattern overheads #1, #2, #3, and #4 may be set through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described in the aforementioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 may be set through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

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

iii) RE locations (ie, symbol locations and/or subcarrier locations) in slots of the basic pattern not included in the higher layer signaling set candidates, and iv) RE locations (ie, symbol locations and/or subcarrier locations) in slots of additional patterns carrier location) may be individually or independently set through DCI or RRC signaling.

Example 2

This embodiment is a method of setting signaling set candidates including elements of i) basic pattern overhead (including the presence or absence of the basic pattern) and ii) additional pattern overhead (including the presence or absence of the additional pattern), and any one of the candidates is selected as DCI It can be dynamically indicated using 1-bit or 2-bit 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 the above i) basic pattern overhead signaling scheme, basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2 may be set through RRC signaling, respectively. Different values or the same value may be set for basic DMRS pattern overhead #1 and basic DMRS pattern overhead #2. As described in the aforementioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may be set through RRC signaling, respectively. Additional DMRS pattern overhead #1 and additional DMRS pattern overhead #2 may have different values or the same value.

Table 27 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 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 overheads #1, #2, #3, and #4 may be set through RRC signaling, respectively. Basic DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value. As described in the aforementioned ii) additional pattern overhead signaling method, additional DMRS pattern overhead #1, #2, #3, and #4 may be set through RRC signaling, respectively. Additional DMRS pattern overheads #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

iii) RE location (i.e., symbol location and/or subcarrier location) in the slot of the basic pattern not included in the higher layer signaling set candidate, iv) RE location (i.e., symbol location and/or subcarrier location) in the slot of the additional pattern location), and v) each of the virtual cell identifiers may be individually or independently set through DCI or RRC signaling.

Example 3

In this embodiment, 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 location in the slot of the basic pattern (ie, symbol location and / or subcarrier location) ); It can be dynamically indicated using 1-bit or 2-bit 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 Add
DMRS pattern
Overhead #1 VCID #1 basic
DMRS pattern
position #1 Add
DMRS pattern
position #1 One
(RRC set candidate #2) basic
DMRS pattern
overhead #2 Add
DMRS pattern
overhead #2 VCID #2 basic
DMRS pattern
position #2 Add
DMRS pattern
position #2

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

As described in the aforementioned iii) RE location (ie, symbol location and/or subcarrier location) signaling method in the slot of the basic pattern, the basic DMRS pattern location #1 and the basic DMRS pattern location #2 are configured through RRC signaling, respectively. Can be. Different values or the same value may be set for the basic DMRS pattern position #1 and the basic DMRS pattern position #2.

As described in the aforementioned iv) RE location (ie, symbol location and / or subcarrier location) signaling method in the slot of the additional pattern, the additional DMRS pattern location # 1 and the additional DMRS pattern location # 2 are configured through RRC signaling, respectively. Can be. Additional DMRS pattern location #1 and additional DMRS pattern location #2 may have different values or the same value.

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

Table 29 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 RRC
parameter #E 0
(RRC set #1) basic
DMRS pattern
Overhead #1 Add
DMRS pattern
Overhead #1 VCID #1 basic
DMRS pattern
position #1 Add
DMRS pattern
position #1 One
(RRC set #2) basic
DMRS pattern
overhead #2 Add
DMRS pattern
overhead #2 VCID #2 basic
DMRS pattern
position #2 Add
DMRS pattern
position #2 2
(RRC set #3) basic
DMRS pattern
Overhead #3 Add
DMRS pattern
Overhead #3 VCID #3 basic
DMRS pattern
position #3 Add
DMRS pattern
position #3 3
(RRC set #4) basic
DMRS pattern
Overhead #4 Add
DMRS pattern
Overhead #4 VCID #4 basic
DMRS pattern
position #4 Add
DMRS pattern
position #4

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

As described in the aforementioned iii) RE location (ie, symbol location and/or subcarrier location) signaling method in the slot of the basic pattern, the basic DMRS pattern locations #1, #2, #3, and #4 respectively perform RRC signaling. can be set through The basic DMRS pattern locations #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

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

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

In this embodiment, 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 location in the slot of the basic pattern (ie, symbol location and / or subcarrier location) ), and iv) a method of setting signaling set candidates including elements of RE positions (ie, symbol positions and/or subcarrier positions) in slots of an additional pattern, and any one of the candidates is 1 bit included in DCI or It can be dynamically indicated using 2-bit information.

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 Add
DMRS pattern
Overhead #1 basic
DMRS pattern
position #1 Add
DMRS pattern
position #1 One
(RRC set candidate #2) basic
DMRS pattern
overhead #2 Add
DMRS pattern
overhead #2 basic
DMRS pattern
position #2 Add
DMRS pattern
position #2

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

As described in the aforementioned iii) RE location (ie, symbol location and/or subcarrier location) signaling method in the slot of the basic pattern, the basic DMRS pattern location #1 and the basic DMRS pattern location #2 are configured through RRC signaling, respectively. Can be. Different values or the same value may be set for the basic DMRS pattern position #1 and the basic DMRS pattern position #2.

As described in the aforementioned iv) RE location (ie, symbol location and / or subcarrier location) signaling method in the slot of the additional pattern, the additional DMRS pattern location # 1 and the additional DMRS pattern location # 2 are configured through RRC signaling, respectively. Can be. Additional DMRS pattern location #1 and additional DMRS pattern location #2 may have different values or 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 Add
DMRS pattern
Overhead #1 basic
DMRS pattern
position #1 Add
DMRS pattern
position #1 One
(RRC set #2) basic
DMRS pattern
overhead #2 Add
DMRS pattern
overhead #2 basic
DMRS pattern
position #2 Add
DMRS pattern
position #2 2
(RRC set #3) basic
DMRS pattern
Overhead #3 Add
DMRS pattern
Overhead #3 basic
DMRS pattern
position #3 Add
DMRS pattern
position #3 3
(RRC set #4) basic
DMRS pattern
Overhead #4 Add
DMRS pattern
Overhead #4 basic
DMRS pattern
position #4 Add
DMRS pattern
position #4

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

As described in the aforementioned iii) RE location (ie, symbol location and/or subcarrier location) signaling method in the slot of the basic pattern, the basic DMRS pattern locations #1, #2, #3, and #4 respectively perform RRC signaling. can be set through The basic DMRS pattern locations #1, #2, #3, and #4 may be set to different values, or some or all of them may be set to the same value.

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

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

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

In step S1110, the base station may determine signaling set candidates for DMRS pattern configuration to be allocated to the terminal. One signaling set candidate includes basic pattern overhead (including the presence or absence of the basic pattern), additional pattern overhead (including the presence or absence of the additional pattern), RE location (i.e., symbol location and/or subcarrier location) in the slot of the basic pattern, and additional pattern It may include setting information for a combination of two or more elements of RE positions (ie, symbol positions and/or subcarrier positions) in slots of, or virtual cell identifiers.

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

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

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

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

In step S1160, the terminal may demodulate the signal received through the physical channel using the estimated channel 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 for the UE through RRC signaling or DCI.

12 is a diagram showing configurations 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 Medium Access Control (MAC) layer, a Radio Resource Control (RRC) layer, or higher layers. The physical layer processor 1215 may process physical (PHY) layer operations (eg, uplink reception signal processing and downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor 1210 may control overall operations of the base station device 1200 .

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

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

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

The DMRS pattern configuration information generating unit 1212 is a signaling set of DMRS configuration information transmitted for demodulation of a physical channel to be transmitted to the UE (eg, basic pattern overhead (including the presence or absence of a basic pattern), additional pattern overhead). (including presence or absence of additional patterns), location of REs in slots of the basic pattern (i.e., symbol locations and/or subcarrier locations), locations of REs in slots of additional patterns (i.e., symbol locations and/or subcarrier locations), or virtual cells. combinations of two or more elements of the identifier) may be determined and instructed to the terminal.

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

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

For example, the DMRS pattern setting information transmission unit 1216 includes information indicating one of the signaling set candidates of the DMRS pattern setting information generated by the DMRS pattern setting information generation unit 1212 of the upper layer processing unit 1210. DCI may be transmitted to the terminal.

The DMRS transmitter 1217 may transmit the DMRS through the transceiver 1230 by mapping the DMRS onto physical resources based on the DMRS configuration allocated to the terminal.

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 a physical resource and transmit it through the transceiver 1230.

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

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

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

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

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

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

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

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

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

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

The physical channel receiving unit 1268 may receive a physical channel transmitted together with the DMRS through the 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 demodulation of the physical channel based on the channel estimated using the DMRS.

In the operations of the base station device 1200 and the terminal device 1250, matters described in the examples of the present invention may be equally applied, and redundant descriptions are omitted.

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

Various embodiments of the present disclosure are intended to explain representative aspects of the present disclosure, rather than listing all possible combinations, and matters described in various embodiments may be applied independently or in combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. For hardware implementation, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), It may be implemented by a processor (general processor), controller, microcontroller, microprocessor, or the like.

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

Claims (21)

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

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