RU2816444C2 - Receiving device, transmitting device, receiving method and transmission method - Google Patents

Abstract

FIELD: electrical communication equipment.

SUBSTANCE: invention relates to communication. Receiving apparatus comprises a control circuit which, during operation, decides to map a second reference signal in a physical downlink shared channel in a second system based on information which enables to map a first reference signal in a first system to be identified, and a receiving circuit which, during operation, receives a second reference signal based on a decision on which a comparison is made, wherein the first reference signal is a cell-specific reference signal, and the first system is an LTE system, wherein the second reference signal is a demodulation reference signal, and the second system is a new radio access technology system, in case the position of at least one reference signal from the plurality of second reference signals changes, control circuit changes the position of the remaining reference signal based on the position of said at least one reference signal.

EFFECT: providing simultaneous data exchange in different signal communication systems during joint operation in the same frequency band with sharing of dynamic spectrum (DSS) to prevent overlapping of signals of said different signal communication systems.

11 cl, 17 dwg

Description

Field of technology

[0001] The present invention relates to a receiving apparatus, a transmitting apparatus, a receiving method and a transmission method.

State of the art

[0002] A communication system called the 5th generation (5G) mobile communication system has been previously discussed. The ^3rd Generation Partnership Project (3GPP) consortium, as an international standards body, discussed the modernization of the 5G communication system, taking into account both the modernization of LTE/LTE-Advanced systems and the new radio access technology (New Radio Access Technology). , New RAT, also called NR), which is a new scheme, not necessarily backward compatible with LTE/LTE-Advanced systems (for example, see non-patent literature (hereinafter NPL) 1).

[0003] NR discussed a technology in which the NR system and the LTE system simultaneously communicate while operating together in the same frequency band (e.g., Dynamic Spectrum Sharing (DSS)) (e.g., see NPL 2).

List of links

Non-patent literature

[0004]

NPL 1

RP-181726, Revised WID on New Radio Access Technology, NTT DOCOMO, September 2018

NPL 2

RP-191042, Enhancements for dynamic spectrum sharing in Rel-16, Ericsson, June 2019.

NPL 3

RP-191599, Enhancements for dynamic spectrum sharing in Rel-16, Ericsson, June 2019.

NPL 4

3GPP TS 38.211 V15.6.0, HP; Physical channels and modulation (Release 15) (NR; Physical channels and modulation (Release 15)), 2019-06.

NPL 5

3GPP TS 38.331 V15.6.0, HP; Radio Resource Control (RRC) protocol specification (Release 15) (NR; Radio Resource Control (RRC) protocol specification (Release 15)), 2019-06.

NPL 6

3GPP TS 38.214 V15.6.0, HP; Physical layer procedures for data (Release 15) (NR; Physical layer procedures for data (Release 15)), 2019-06.

Disclosure of the invention

Technical problem

[0005] However, the method for matching the reference signal has not been discussed enough.

[0006] One non-limiting and exemplary embodiment provides a receiving apparatus, a transmitting apparatus, a receiving method, and a transmitting method that are configured to appropriately match a reference signal.

[0007] A receiving apparatus according to an embodiment of the present invention includes: a control circuit that, in operation, decides to match a second reference signal in a second system based on information that allows the first reference signal to be matched in a first system to be identified; and a receiving circuit that, in operation, receives the second reference signal based on the matching decision.

[0008] It should be noted that general or specific embodiments may be implemented as a system, method, integrated circuit, computer program, storage medium, or any selected combination thereof.

[0009] According to an embodiment of the present invention, the reference signal can be correspondingly matched.

[0010] Additional advantages and disadvantages of the disclosed embodiments will become apparent from the description of the invention and the drawings. Such features and/or advantages may be separately obtained by various embodiments and features from the specification and drawings, all of which need not be presented to obtain one or more of such features and/or advantages.

Brief description of drawings

[0011]

In FIG. 1 shows an example DSS signal;

in FIG. 2 shows an example of a type B PDSCH mapping;

in FIG. 3 is a block diagram illustrating an example of CRS mapping;

in FIG. 4 shows an example of MU-MIMO technology based on orthogonal DMRS and DSS;

in FIG. 5 is a block diagram illustrating a configuration example of a base station part;

in FIG. 6 is a block diagram illustrating a configuration example of a mobile station part;

in FIG. 7 is a block diagram illustrating an example of a base station configuration;

in FIG. 8 is a block diagram illustrating a configuration example of a mobile station;

in FIG. 9 is a flowchart illustrating an example of operation of a base station and a mobile station;

in FIG. 10 shows an example of signal matching according to Operation Example 1-1;

in FIG. 11 shows an example of signal matching according to operation example 1-2;

in FIG. 12 shows an example of signal matching according to Operation Example 1-3;

in FIG. 13 shows an example of signal mapping according to operation example 1-4;

in FIG. 14 shows an example of signal mapping according to operation example 1-4;

in FIG. 15 shows an example of operation in the case where MU-MIMO technology based on orthogonal DMRS is not used;

in FIG. 16 shows an example of signal matching according to Operation Example 2-1; And

in FIG. 17 shows an example of signal matching according to Operation Example 2-2.

Carrying out the invention

[0012] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0013] [Dynamic Spectrum Sharing (DSS)]

With DSS, the NR system and the LTE system can communicate simultaneously while sharing the same frequency band.

[0014] For example, when using DSS according to Release 15 (hereinafter referred to as "Release 15"), a channel for LTE may be mapped in an LTE downlink subframe in an LTE frequency band (also referred to as a "carrier"). For example, as shown in FIG. 1, the control signal for LTE and a reference signal (eg, cell-specific reference signal (CRS)) for LTE may be mapped in 1 or more symbols (eg, orthogonal frequency division multiplexing symbols multiplexing, OFDM)) on top in the LTE downlink subframe, and the LTE downlink data channel (eg, LTE Physical Downlink Shared Channel (PDSCH)) and the LTE CRS can be mapped in the remaining OFDM symbols.

[0015] In DSS, for example, in the OFDM symbol period in which the LTE PDSCH is mapped, the LTE PDSCH may be mapped in a portion of frequency bands, and the downlink control channel for NR (Physical Downlink Control Channel, PDCCH) NR) or downlink data channel for NR (NR PDSCH) may be mapped in another frequency band, as shown in FIG. 1. In other words, LTE PDSCH and each NR channel can be separated by frequency. However, as shown in FIG. 1, CRS (also called LTE CRS) may also be transmitted, in addition to the frequency band in which the LTE PDSCH is associated, in the frequency band in which each NR channel is associated.

[0016] For example, for DSS, it has been proposed to introduce a PDSCH mapping method (referred to, for example, as “type B NR PDSCH mapping”) with OFDM symbol lengths 9 and 10 (see, for example, NPL 3). For example, according to this PDSCH mapping method, the position of an NR reference signal (eg, a demodulation reference signal (DMRS)) is determined or can be configured so that it does not overlap with a symbol including the LTE CRS. The introduction of this type B NR PDSCH mapping improves the performance of DSS.

[0017] However, the PDSCH mapping itself is not defined in issue 15 (eg, see NPL 4) and the said DMRS mapping in the PDSCH has not been discussed sufficiently.

[0018] Accordingly, in one embodiment of the present invention, a method for mapping DMRS on a PDSCH will be described.

[0019] [DMRS Mapping]

As an example of a method for mapping DMRS on an uplink data channel (eg, a physical uplink shared channel (PUSCH)), NPL 4 (eg, section 6.4.1.1.3) defines a method for mapping DMRS at matching NR PUSCH type B with a length of 9 and 10 OFDM symbols.

[0020] For example, a matching method similar to the DMRS matching method of Type B NR PUSCH mapping may be applied to DMRS matching of Type B NR PUSCHs of length 9 and 10 OFDM symbols on a downlink data channel (eg, PDSCH). For example, an exemplary DMRS matching method for matching Type B NR PUSCHs of length 9 and 10 OFDM symbols is shown in FIG. 2. For example, the dmrs-AdditionalPosition parameter shown in FIG. 2 is a higher level parameter (also called, for example, a “radio resource control (RRC) parameter”) indicating the position of the DMRS (in other words, the additional DMRS). For example, the dmrs-AdditionalPosition parameter is specified (in other words, configured for) a mobile station (also called, for example, a “terminal” or “user equipment” (UE)) by a base station (also called, for example, a gNB).

[0021] Hereinafter, the DMRS matching method shown in FIG. 2 is referred to as “Assumption 1”. For example, in Assumption 1 shown in FIG. 2, with length l _d =9 or 10, DMRS may be matched at the top symbol (or starting symbol) l ₀ of the scheduled PDSCH in the slot and at the symbol(s) specified by the dmrs-AdditionalPosition parameter (e.g., at some position(s) relative to l ₀ (=0)).

[0022] [NR DMRS Shift]

As described above, in DSS, for example, the NR PDSCH may be transmitted in a frequency band in which LTE CRS is transmitted. In this case, DMRS in NR PDSCH and LTE CRS can be implemented in such a way as not to conflict with each other in time resources and frequency resources (for example, see NPL 3).

[0023] For example, in the case where LTE CRS may conflict with DMRS on an NR PDSCH that is configured based on "Assumption 1", the base station may transmit DMRS in a position different from the position (in other words, resource position) of the DMRS configured based on "Assumption 1". In this case, for example, processing of changing the DMRS position to a position different from the position configured based on “Assumption 1” may also be referred to as “DMRS shift”.

[0024] [CRS Mapping]

In an LTE subframe, the symbols (in other words, time domain positions) at which CRSs are mapped vary greatly depending on, for example, the number of CRS ports or the type of subframe. Examples of the subframe type include a multimedia broadcast service single frequency network (MBSFN) subframe and a non-MBSFN subframe. In FIG. Figure 3 shows an example CRS matching method. For example, in an MBSFN subframe in which the number of CRS ports is 1 or 2, CRSs are transmitted in 4 symbols of the zero, fourth, seventh and eleventh symbols. Moreover, for example, in an MBSFN subframe in which the number of CRS ports is 4, the CRSs are transmitted in 6 symbols of the zero, first, fourth, seventh, eighth and eleventh symbols. In addition, for example, in a subframe other than MBSFN, the CRSs are transmitted in 1 character of the zero character or in 2 characters of the zero and first characters.

[0025] In this case, the first symbol in the subframe or interval is the "null symbol".

[0026] In addition, the CRS positions and the number of CRS ports in the frequency domain and the MBSFN subframe time can be configured for the mobile station, for example, using a higher layer parameter (eg, RRC RateMatch PatternLTE-CRS parameter).

[0027] [Multi-User Multiple Input Multiple Output (MU-MIMO)]

In the MU-MIMO system for multiple mobile stations, an operation is adopted in which the NR DMRS ports between the mobile stations are orthogonal to each other (referred to, for example, as “Orthogonal DMRS-based MU-MIMO”). In the case of MU-MIMO based on orthogonal DMRS, it is assumed as shown in FIG. 4, for example, that the NR DMRS ports between mobile stations A and B are orthogonal to each other.

[0028] In this case, for example, if a DSS operation is performed on mobile station A and not performed on mobile station B, DMRS shift may be performed on mobile station A and may not be performed on mobile station B (not shown). However, since the DMRS positions between mobile stations A and B are different, the orthogonality between the DMRS ports may deteriorate.

[0029] It should be noted that, for example, in issue 15, the mobile station is indicated by the DCI associated with the antenna port mapping that "all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE", thus implicitly indicates that the mobile station operates using MU-MIMO based on orthogonal DMRS (eg, see NPL 6).

[30] (Embodiment 1) [Communication System Overview]

The communication system according to the present embodiment includes a base station (corresponding to a “transmitting apparatus”) 100 and a mobile station (corresponding to a “receiving apparatus”) 200.

[0031] In the present embodiment, a description will be provided of a method in which the base station 100 and the mobile station 200 determine whether the symbol in which the DMRS is mapped is changed (in other words, shifted) to a symbol other than a configured symbol (for example, a symbol based on Assumption 1), for example, in a slot (called, for example, “NR slot”) for transmitting an NR signal (eg, PDSCH) on the downlink.

[0032] As a result of the above definition, the base station 100 and the mobile station 200 are able to prevent collision between DMRS and CRS even when MU-MIMO based on orthogonal DMRS is used, for example, for the mobile station 200. In addition, the base station 100 and mobile station 200 is capable of preventing deterioration of DMRS port orthogonality between mobile stations 200.

[0033] In FIG. 5 is a block diagram illustrating a configuration example of a portion of the base station 100 according to the present embodiment. In the base station 100 shown in FIG. 5, a controller 101 (eg, corresponding to a control circuit) decides to match a second reference signal (eg, DMRS) in a second system (eg, an NR system) based on information that allows the first reference signal (eg, CRS) to be matched in a first system. (eg, an LTE system) to be identified, and the transmitter 104 (eg, corresponding to the transmission scheme) transmits a second reference signal based on the matching decision.

[34] In FIG. 6 is a block diagram illustrating a configuration example of a portion of the mobile station 200 according to the present embodiment. In the mobile station 200 shown in FIG. 6, controller 206 (e.g., corresponding to the control circuit) decides to map a second reference signal (e.g., DMRS) in a second system (e.g., an NR system) based on information that allows the first reference signal (e.g., CRS) to be mapped in the first system. (eg, LTE system) to be identified, and the receiver 202 (eg, corresponding to the reception scheme) receives the second reference signal based on the matching decision.

[35] [Base station configuration]

In FIG. 7 is a block diagram illustrating a configuration example of the base station 100 according to the present embodiment. As shown in FIG. 7, base station 100 includes a controller 101, an encoder/modulator 102, a signal matcher 103, a transmitter 104, and an antenna 105.

[0036] For example, controller 101 generates a higher level signal (eg, an RRC parameter) including a parameter configured for mobile station 200 and outputs this signal to encoder/modulator 102. The higher level signal may include, for example , LTE CRS information (eg, RateMatchPatternLTE-CRS), or information about the band configured for the mobile station 200 (eg, the active bandwidth part (BWP)).

[0037] In addition, the controller 101 makes a decision regarding data information (eg, PDSCH). For example, the controller 101 makes a decision regarding the active BWP in which the PDSCH is transmitted, the PDSCH destination area (referred to, for example, as a “PDSCH area”), or whether MU-MIMO is used based on the DMRS orthogonal port. The controller 101 then outputs to the signal mapper 103 downlink control information (eg, downlink control information (DCI)), including information that explicitly or implicitly indicates information about which a decision has been made. In addition, the controller 101 outputs data (in other words, provides an indication) about the PDSCH region that has been decided upon to the signal matcher 103.

[0038] In addition, the controller 101 determines whether the DMRS position on the PDSCH (e.g., a symbol position) changes (in other words, shifts) relative to a reference position (e.g., a position associated with a PDSCH region; e.g., the position in Assumption 1 shown in FIG. 2). The controller 101 outputs information about the determined DMRS position to the signal matcher 103 .

[0039] The encoder/modulator 102 performs error correction coding and modulation of the data (eg, PDSCH) and the higher level signal received from the controller 101, and outputs the modulated signal to the signal mapper 103.

[0040] For example, the signal matcher 103 matches (in other words, assigns or matches) the DCI received from the controller 101 in the PDCCH area resource. In addition, the signal matcher 103 matches the DMRS and the signal received from the encoder/modulator 102 in PDSCH area resources. The signal matcher 103 outputs the signals matched in the resources to the transmitter 104.

[0041] The transmitter 104 performs radio transmission processing, including frequency conversion using a carrier wave, on the signal received from the signal matcher 103, and outputs the signal subjected to the radio transmission processing to the antenna 105.

[0042] Antenna 105 radiates a signal (in other words, a downlink signal) received from transmitter 104 towards mobile station 200.

[0043] [Mobile Station Configuration]

In FIG. 8 is a block diagram illustrating a configuration example of the mobile station 200 according to the present embodiment. As shown in FIG. 8, mobile station 200 includes an antenna 201, a receiver 202, a signal separator 203, a channel estimator 204, a demodulator/decoder 205, and a controller 206.

[0044] Antenna 201 receives a downlink signal transmitted by base station 100 (for example, see FIG. 7) and outputs the signal to receiver 202.

[0045] The receiver 202 performs radio reception processing including frequency conversion on the signal received from the antenna 201, and outputs the signal subjected to the radio reception processing to the signal separator 203.

[0046] The signal separator 203 extracts (in other words, separates), for example, the DCI mapped in a PDCCH area resource from the signal received from the receiver 202, and outputs the DCI to the controller 206. In addition, the signal separator 203 extracts (in other words, separates) the data signal and the DMRS mapped in the PDSCH area resources based on the information indicating the PDSCH area resources and the information indicating the DMRS position that are received from the controller 206. The signal separator 203 outputs the data signal to the demodulator/decoder 205 and outputs the DMRS to 204 channel evaluator.

[0047] Channel estimator 204 performs channel estimation (eg, calculating a channel estimate value) based on the DMRS received from signal separator 203 . Channel estimator 204 outputs information indicating the channel estimate value to demodulator/decoder 205.

[0048] Demodulator/decoder 205 demodulates and decodes the data signal received from signal separator 203 based on the channel estimate value received from channel estimator 204 . Demodulator/decoder 205 outputs the higher level signal obtained by decoding to controller 206.

[0049] The controller 206 identifies, for example, the PDSCH region and the DMRS position associated with the PDSCH region based on the higher level signal received from the demodulator/decoder 205 and the DCI received from the signal separator 203.

[0050] In addition, the controller 206 determines whether the DMRS position on the PDSCH (eg, symbol position) has changed (in other words, moved) relative to the original position (eg, the position in Assumption 1 shown in FIG. 2).

[0051] The controller 206 outputs the PDSCH region information and the DMRS position information to the signal separator 203.

[0052] [Example of operation of base station 100 and mobile station 200]

Next, an operating example of the base station 100 (see FIG. 7) and the mobile station 200 (see FIG. 8) will be described.

[0053] In FIG. 9 is a block diagram illustrating an exemplary processing process in the base station 100 and the mobile station 200.

[0054] For example, the base station 100 instructs the mobile station 200 using a higher level signal (in other words, configures a higher level signal for the mobile station 200) (ST101). Mobile station 200 receives a signal from the uplink layer indicated by base station 100.

[0055] The higher layer signal may include, for example, LTE CRS information (eg, RateMatchPatternLTE-CRS) or information about the band assigned to the mobile station 200 (eg, active BWP). In addition, for example, the active BWP information may include information about the sub carrier spacing (SCS) configured for the mobile station 200. It should be noted that the mobile station 200 may be indicated in these pieces of information by at least one of a higher layer parameter and downlink control information (eg, DCI), or these pieces of information may be preconfigured for the mobile station 200.

[0056] The base station 100 determines the contents of the DCI in which the mobile station 200 (ST102) is indicated. The DCI may include, for example, the following information.

[0057] <PDSCH assignment information>

The PDSCH assignment information may include, for example, information about a resource in the frequency domain to which the PDSCH is assigned (eg, mapping type B) and information such as a resource in the time domain to which the PDSCH is mapped (eg, starting symbol and length character).

[0058] <PDSCH Band Information>

The PDSCH transmission band information may include, for example, information about the BWP in which the PDSCH is transmitted (eg, including subcarrier spacing information).

[0059] <MU-MIMO information based on DMRS orthogonal port>

The DMRS orthogonal port-based MU-MIMO information may include, for example, information indicating whether DMRS orthogonal port-based MU-MIMO is used by the mobile station 200. For example, the base station 100 may explicitly or implicitly indicate to the mobile station 200 MU-MIMO information based on DMRS orthogonal port.

[0060] It should be noted that the information included in the DCI is not limited to the information described above and may be other information.

[0061] Base station 100 determines whether the DMRS position on the PDSCH is configured (in other words, changed or shifted) to achieve a position different from the configured position (eg, the position in "Assumption 1" illustrated in FIG. 2) based on the information configured for the mobile station 200 (eg, information included in a higher layer parameter and DCI) (ST103). For example, base station 100 may determine whether a condition for a DMRS offset is “true” or “false.”

[0062] In the event that the base station 100 determines that the DMRS is shifted (ST103: YES), the base station 100 decides that the DMRS position corresponds to the nth symbol different from the mth symbol configured, for example, for mobile station 200 (ST104). In other words, the DMRS position configured for the mobile station 200 is shifted from the m-th symbol to the n-th symbol.

[0063] In the event that the base station 100 determines that the DMRS is not shifted (ST103: NO), on the other hand, the base station 100 does not change (shift) the position of the DMRS.

[0064] The base station 100 transmits a downlink signal to the mobile station 200 (ST105). The downlink signal may include, for example, at least one of a PDSCH including DMRS and a PDCCH including DCI. It should be noted that the DMRS is mapped at a position (e.g., symbol) determined, for example, by base station 100.

[0065] For example, the mobile station 200 receives a downlink signal transmitted from the base station 100 and confirms the information (in other words, content) indicated by the DCI in the PDCCH included in the downlink signal (ST106). For example, the mobile station 200 may determine based on the assignment information on the PDSCH that a DMRS position is configured for the mth symbol.

[0066] For example, the mobile station 200 determines, based on the received higher level signal and the information specified in the DCI, whether the DMRS position on the PDSCH has been configured (in other words, changed or shifted) to reach a position (e.g., nth symbol) different from the configured position (for example, m-th character) (ST107). For example, mobile station 200 may determine whether the condition for the DMRS offset is “true” or “false”.

[0067] In the event that the base station 100 determines that the DMRS is shifted (ST107: YES), the mobile station 200 decides that the DMRS position corresponds to the nth symbol different from the mth symbol configured, for example, for mobile station 200 (ST108). In other words, the DMRS position configured for the mobile station 200 is shifted from the m-th symbol to the n-th symbol.

[0068] In the event that the base station 100 determines that the DMRS is not shifted (ST107: NO), on the other hand, the mobile station 200 does not change the position (shifts) of the DMRS.

[0069] The mobile station 200 performs PDSCH reception processing (eg, demodulation processing) based on the DMRS mapped, for example, to a certain position (ST109).

[0070] Next, implementation examples, respectively, of DMRS matching according to the present embodiment will be described.

[0071] <Work Example 1-1>

In Operation Example 1-1, for example, a method will be described in which the base station 100 and the mobile station 200 determine whether the DMRS position configured for the eleventh symbol (eg, m=11) in the NR interval has changed to the twelfth symbol (in other words whether it has moved to the twelfth character) (n=12).

[0072] As an example, a case will be described where the NR PDSCH for the mobile station 200 is assigned 9 symbols from the fifth symbol to the thirteenth symbol in the slot, as shown in FIG. 10(a). In this case, for example, based on “Assumption 1” illustrated in FIG. 2, the DMRS position in the PDSCH is configured for the eleventh symbol corresponding to l=6, as illustrated in FIG. 10(a).

[0073] Additionally, as shown in FIG. 3, for example, CRS can be matched at the eleventh character in the interval, but cannot be matched at the twelfth character. Accordingly, collision between the DMRS in the NR PDSCH and the LTE CRS can be prevented by configuring the DMRS position for the twelfth symbol (in other words, changing it or shifting it to the twelfth symbol) different from, for example, the eleventh symbol.

[0074] For example, if the content specified in the configuration information of the mobile station 200 satisfies at least one of the following conditions, the base station 100 and the mobile station 200 decide that the DMRS position corresponds to the twelfth symbol different from the eleventh symbol , configured for the mobile station 200, as shown in FIG. 10(b) (for example, processing in steps ST103 and ST107 shown in FIG. 9). In other words, when processed in steps ST103 and ST107 shown in FIG. 9, the base station 100 and mobile station 200 may determine that a condition for a DMRS offset is “true” if the content specified in the information configured for the mobile station 200 (e.g., information that allows the mapping to be identified (or evaluated) LTE CRS) satisfies the following conditions.

[0075] Condition (1): “The mobile station 200 does not operate in an unlicensed band (also called, for example, “NR-Unlicensed (NR-U)”)”

For example, the base station 100 may indicate to the mobile station 200 an NR frequency band (e.g., a licensed band or an unlicensed band) configured for the mobile station 200 using control information (e.g., a higher layer signal or DCI), or the frequency band may be configured to mobile station 200.

[0076] For example, it may be assumed that DSS is not used in the unlicensed band. Accordingly, in the event that the mobile station 200 operates in an unlicensed band, the DMRS included in the NR signal for the mobile station 200 cannot conflict with the LTE CRS, so that the DMRS position in the NR PDSCH (eg, the eleventh symbol) cannot be changed .

[0077] In the licensed band, on the other hand, DSS may be used such that a CRS may be matched at the eleventh symbol in a slot, as shown, for example, in FIG. 3. Accordingly, in the event that the mobile station 200 does not operate in an unlicensed band, it can be determined that LTE CRS and DMRS may overlap with each other.

[0078] Thus, for example, if condition (1) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to a twelfth symbol different from the eleventh symbol. In other words, in the case where the mobile station 200 operates in a licensed band, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the twelfth symbol.

[0079] Condition (2): "RRC RateMatchPatternLTE-CRS parameter is configured for mobile station 200"

For example, if the RateMatchPatternLTE-CRS parameter is configured for the mobile station 200, the LTE CRS could be configured in the LTE system such that the DMRS in the NR PDSCH and the LTE CRS can overlap with each other. For example, since the CRS may be matched at the eleventh symbol in the interval, as illustrated in FIG. 3, it can be determined that the DMRS in the NR PDSCH and the LTE CRS may overlap each other in the eleventh symbol.

[0080] Accordingly, if condition (2) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the twelfth symbol different from the eleventh symbol.

[0081] Condition (3): “The RRC RateMatchPatternLTE-CRS parameter is configured for the mobile station 200, and the time of the MBSFN subframe configured by the RRC parameter does not match the DMRS transmission time.”

For example, as illustrated in FIG. 3, the CRS may be matched at the zero or first symbol in the MBSFN subframe. Accordingly, in the case that the time of the MBSFN subframe coincides with the transmission time of the DMRS, the DMRS in the PDSCH and the LTE CRS cannot conflict with each other, so that the position of the DMRS in the NR PDSCH (eg, the eleventh symbol) cannot be changed.

[0082] On the other hand, in the case that the time of the MBSFN subframe does not match the time of the DMRS transmission, for example, in the case that the time of the non-MBSFN subframe matches the time of the DMRS transmission, the CRS may be matched in the eleventh symbol, as shown in FIG. 3, so that it can be determined that the DMRS in the PDSCH and the LTE CRS may conflict with each other.

[0083] Accordingly, in the case where condition (3) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the twelfth symbol different from the eleventh symbol.

[0084] As described above, in the MBSFN subframe, DMRS is not mapped in the eleventh symbol. Accordingly, condition (3) represents a condition under which DMRS and CRS are more likely to conflict with each other than under condition (2).

[0085] Condition (4): "An active BWP including Sub Carrier Spacing (SCS) of 15 kHz is used in the mobile station 200"

In case the SCS configured for the mobile station 200 in the NR system is 15 kHz, i.e. In the case of using the same subcarrier spacing as in the LTE system, it can be determined that the DMRS in the PDSCH NR and the LTE CRS may conflict with each other in the eleventh symbol, as shown, for example, in FIG. 3.

[0086] Accordingly, in the case where condition (4) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to a twelfth symbol different from the eleventh symbol.

[0087] Condition (5): "MU-M1MO based on DMRS orthogonal port is used for mobile station 200"

If the DMRS position changes in at least one mobile station 200 of a plurality of mobile stations 200 subject to MU-MIMO multiplexing, in the case where the mobile station 200 is indicated with MU-MIMO based on the DMRS orthogonal port by the DCI, for example, DMRS orthogonality among multiple mobile stations 200 may deteriorate.

[0088] Accordingly, in the case where condition (5) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the twelfth symbol different from the eleventh symbol.

[0089] In other words, in the case where condition (5) is satisfied, the DMRS position for the plurality of mobile stations 200 for which MU-MIMO based on the DMRS orthogonal port is used is configured for the twelfth symbol. With this configuration of the DMRS, even if the position of the DMRS relative to the mobile station 200 for which the DSS operation is performed changes, for example, the position of the DMRS relative to the other mobile stations 200 that are collectively to be subjected to MU-MIMO multiplexing also changes, such Thus, deterioration of the DMRS orthogonality among the plurality of mobile stations 200 can be prevented.

[0090] For example, in the case where mobile station B is specified in the example illustrated in FIG. 4 that MU-MIMO is used based on the DMRS orthogonal port, mobile station B may decide, even if DSS is not used for mobile station B, that the DMRS position corresponds to the twelfth symbol, given that DSS may be used for another mobile station A to be multiplexed by MU-MIMO.

[0091] It should be noted that condition (5) can be defined as, for example, “it is assumed that the DCI received by the mobile station 200 corresponds to MU-MIMO based on the DMRS orthogonal port.”

[0092] Condition (6): “The PDSCH Type B mapping assignment is indicated by the DCI received by the mobile station 200.”

When assigned by mapping type B PDSCH, if l _d =9, as shown in FIG. 2, for example, DMRS in the PDSCH may be mapped in the eleventh symbol corresponding to l=6. In addition, as shown in FIG. 3, for example, the CRS may be matched at the eleventh character in the interval. Accordingly, in the case where a Type B PDSCH mapping is configured, the DMRS in the NR PDSCH and the LTE CRS may conflict with each other in the eleventh symbol.

[0093] Accordingly, in the case where condition (6) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to a twelfth symbol different from the eleventh symbol.

[0094] Condition (7): “The assignment by mapping PDSCH type B is indicated by the DCI received by the mobile station 200, and the assignment is “9 symbols from the fifth symbol to the thirteenth symbol””

When assigned by mapping a type B PDSCH described in condition (6), the DMRS in the PDSCH may be mapped in the eleventh symbol corresponding to l=6 in the case where the length of the PDSCH is 9 symbols (for example, l _d =9 as shown in FIG. 2). In addition, the CRS may be matched at the eleventh symbol in the interval, for example, as shown in FIG. 3. Accordingly, in the case where a Type B PDSCH mapping is configured, the DMRS in the NR PDSCH and the LTE CRS may conflict with each other in the eleventh symbol.

[0095] Accordingly, in the case where condition (7) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to a twelfth symbol different from the eleventh symbol.

[0096] For example, in the case where the PDSCH length is 10 symbols (eg, I _d =10, as shown in FIG. 2) for the single-symbol DMRS illustrated in FIG. 2, DMRS is not matched at the eleventh symbol (corresponding to l=7). Accordingly, condition (7) represents a condition under which DMRS and CRS are more likely to conflict with each other than under condition (6).

[0097] Conditions (1) to (7) have been described above, respectively.

[0098] The base station 100 and the mobile station 200 may make a determination to decide that the DMRS position corresponds to the eleventh symbol or the twelfth symbol based on, for example, any one or a plurality of conditions (1)-(7).

[0099] According to Example 1-1 of work, for example, in the case that the DMRS in the NR PDSCH and the LTE CRS may conflict with each other, the base station 100 and the mobile station 200 decide that the DMRS position corresponds to the twelfth symbol (in other words, changes or shifts the DMRS position to the twelfth symbol) in which the DMRS does not collide with the CRS, based on the information configured for the mobile station 200. This DMRS position decision avoids collision between the DMRS on the NR PDSCH and the LTE CRS.

[0100] In addition, for example, if at least one of the conditions (1)-(7) described above is satisfied, the base station 100 and the mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be used for mobile station 200.

[0101] For example, base station 100 performs a DMRS shift for each of a plurality of mobile stations 200 for which orthogonal DMRS-based MU-MIMO is used. In addition, each mobile station 200 for which MU-MIMO based on orthogonal DMRS is used determines, on the assumption that a DMRS offset can be performed to prevent collision between DMRS and CRS at another mobile station 200 to be multiplexed by MU-MIMO, that the DMRS shift is also performed for each mobile station 200 as described above. In the case where MU-MIMO based on orthogonal DMRS is used for each mobile station 200 as described above, the above definition can accordingly reduce the degradation of orthogonality between DMRS ports corresponding to a plurality of mobile stations 200.

[0102] Considering the above, Example 1-1 of work allows, for example, to avoid conflict between DMRS and CRS. In addition, work example 1-1 allows you to maintain orthogonality, for example, between DMRS ports.

[0103] It should be noted that although the case of m=11 and n=12 was described in Example 1-1, the position of the DMRS after the change (in other words, after the shift) is not limited to the twelfth symbol, but may correspond to the thirteenth symbol or subsequent symbol , or may match the tenth character, or the ninth character or the character preceding it. Changes to these symbols allow flexible mapping of the DMRS at a time position or interval suitable, for example, to improve the accuracy of channel estimation at mobile station 200.

[0104] <Example 1-2 work>

In Operation Example 1-2, for example, a method will be described in which the base station 100 and the mobile station 200 determine whether the DMRS position configured for the eighth symbol (eg, m=8) in the NR interval has changed to the ninth symbol (in other words whether it has moved to the ninth character) (n=9).

[0105] As an example, a case will be described where the NR PDSCH for the mobile station 200 is assigned 9 symbols from the fifth symbol to the thirteenth symbol in the slot, as shown in FIG. 11(a). In this case, for example, based on "Assumption 1" illustrated in FIG. 2, the DMRS position in the PDSCH is configured for the eighth symbol corresponding to l=3, as illustrated in FIG. 11(a).

[0106] In addition, for example, as shown in FIG. 3, CRS can be matched at the eighth character in the interval, but cannot be matched at the ninth character. Accordingly, collision between the DMRS in the NR PDSCH and the LTE CRS can be prevented by configuring the DMRS position for the ninth symbol (in other words, changing it or shifting it to the ninth symbol) different from, for example, the eighth symbol.

[0107] In operating example 1-2, if the content specified in the configuration information of the mobile station 200 satisfies at least one of the conditions (1) to (7) described in operating example 1-1 and the condition (8) described below, for example, the base station 100 and the mobile station 200 decide that the DMRS position corresponds to a ninth symbol different from the eighth symbol configured for the mobile station 200 as shown in FIG. 11(b) (for example, processing in steps ST103 and ST107 shown in FIG. 9).

[0108] Condition (8):

Condition (8) corresponds to the case where “The RRC RateMatchPatternLTE-CRS parameter is configured for mobile station 200, the number of CRS ports configured using the RRC parameter is 4, and the MBSFN subframe time configured using the RRC parameter does not match the DMRS transmission time "

[0109] An example in which condition (8) is satisfied corresponds to the case where the time of a non-MBSFN subframe coincides with the DMRS transmission time. For example, as shown in FIG. 3, the CRS may be mapped in the eighth symbol in a non-MBSFN subframe with the number of CRS ports being 4, so that the DMRS in the NR PDSCH and the LTE CRS may overlap each other in the eighth symbol.

[0110] Accordingly, if condition (8) is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to a ninth symbol different from the eighth symbol.

[0111] The base station 100 and the mobile station 200 may make a determination to decide that the DMRS position corresponds to the eighth symbol or the ninth symbol based on, for example, any one or a plurality of conditions (1)-(8).

[0112] According to Example 1-2 of work, for example, in the case that the DMRS in the NR PDSCH and the LTE CRS may conflict with each other, the base station 100 and the mobile station 200 decide that the position of the DMRS in the NR PDSCH corresponds to the ninth symbol (otherwise in other words, changes or shifts the DMRS position on the NR PDSCH to the ninth symbol) in which the DMRS does not collide with the CRS, based on the information configured for the mobile station 200. This DMRS position decision avoids collision between the DMRS on the NR PDSCH and the LTE CRS.

[0113] In addition, for example, if at least one of the conditions (1)-(8) described above is satisfied, the base station 100 and the mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be used for mobile station 200.

[0114] For example, base station 100 performs DMRS shifting for each of a plurality of mobile stations 200 for which orthogonal DMRS-based MU-MIMO is used. In addition, each mobile station 200 for which MU-MIMO based on orthogonal DMRS is used determines, on the assumption that a DMRS offset can be performed to prevent collision between DMRS and CRS at another mobile station 200 to be multiplexed by MU-MIMO, that the DMRS shift is also performed for each mobile station 200 as described above. In the case where MU-MIMO based on orthogonal DMRS is used for each mobile station 200 as described above, the above definition can accordingly reduce the degradation of orthogonality between DMRS ports corresponding to a plurality of mobile stations 200.

[0115] Considering the above, Example 1-2 of work allows, for example, to avoid conflict between DMRS and CRS. In addition, work example 1-2 allows you to maintain orthogonality, for example, between DMRS ports.

[0116] It should be noted that although the case of m=8 and n=9 was described in Example 1-2 of the work, the position of the DMRS after the change (in other words, after the shift) is not limited to the ninth symbol, but may correspond to the tenth symbol, eleventh symbol or a subsequent character, or may correspond to a seventh character, or a sixth character, or a character, for example, preceding it. Changes to these symbols allow flexible mapping of the DMRS at a time position or interval suitable, for example, to improve the accuracy of channel estimation at mobile station 200.

[0117] <Example 1-3 work>

In Operation Example 1-3, for example, a method will be described in which the base station 100 and the mobile station 200 determine whether the position of the DMRS (in other words, two-symbol DMRS) configured for the tenth and eleventh symbols has changed (for example, m=10 and 11 ) in the NR interval by the twelfth and thirteenth characters (in other words, did it move to the twelfth and thirteenth characters) (for example, n=12 and 13).

[0118] As an example, a case will be described where the NR PDSCH for the mobile station 200 is assigned to 9 symbols from the fifth symbol to the thirteenth symbol in the interval, as shown in FIG. 12(a). In this case, based on "Assumption 1" shown in FIG. 2, for example, the DMRS position in the PDSCH is configured for the tenth and eleventh symbols corresponding to l=5, as shown in FIG. 12(a).

[0119] In addition, for example, as shown in FIG. 3, CRS can be matched at the eighth character in the interval, but cannot be matched at the ninth character. Accordingly, collision between the DMRS in the NR PDSCH and the LTE CRS can be prevented by configuring the DMRS position for the ninth symbol (in other words, changing it or shifting it to the ninth symbol) different from, for example, the eighth symbol.

[0120] In operating example 1-3, if the content specified in the configuration information of the mobile station 200 satisfies at least one of the conditions (1) to (7) described in operating example 1-1, for example, the base station 100 and the mobile station 200 decide that the DMRS position corresponds to the twelfth and thirteenth symbols, different from the tenth and eleventh symbols configured for the mobile station 200, as shown in FIG. 12(b) (for example, processing in steps ST103 and ST107 shown in FIG. 9).

[0121] The base station 100 and the mobile station 200 may make a determination to decide that the DMRS position corresponds to the tenth and eleventh symbols or the twelfth and thirteenth symbols based, for example, on any one or more of conditions (1)-(7 ).

[0122] According to operating example 1-3, for example, in the case that the DMRS in the NR PDSCH and the LTE CRS may conflict with each other, the base station 100 and the mobile station 200 decide that the position of the two-character DMRS in the NR PDSCH corresponds to the twelfth and thirteenth symbols (in other words, changes or shifts the position of the two-symbol DMRS in the NR PDSCH to the twelfth and thirteenth symbols) in which the two-symbol DMRS does not conflict with the CRS, based on information configured for the mobile station 200. This DMRS position decision avoids collision between two-symbol DMRS in NR PDSCH and LTE CRS.

[0123] In addition, for example, if at least one of the conditions (1)-(7) described above is satisfied, the base station 100 and the mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be used for the mobile station 200 in the same manner as in Operation Example 1-1.

[0124] For example, base station 100 performs DMRS shifting for each of a plurality of mobile stations 200 for which orthogonal DMRS-based MU-MIMO is used. In addition, each mobile station 200 for which MU-MIMO based on orthogonal DMRS is used determines, on the assumption that a DMRS offset can be performed to prevent collision between DMRS and CRS at another mobile station 200 to be multiplexed by MU-MIMO, that the DMRS shift is also performed for each mobile station 200 as described above. In the case where MU-MIMO based on orthogonal DMRS is used for each mobile station 200 as described above, the above definition can accordingly reduce the degradation of orthogonality between DMRS ports corresponding to a plurality of mobile stations 200.

[0125] Considering the above, Example 1-3 of work allows, for example, to avoid a conflict between a two-character DMRS and a CRS. In addition, work example 1-3 allows you to maintain orthogonality, for example, between DMRS ports.

[0126] It should be noted that although Example 1-3 of the work described the case of m=10 and 11 and n=12 and 13, the position of the DMRS after the change (in other words, after the shift) is not limited to the twelfth and thirteenth characters, but may , for example, match the ninth and tenth characters or 2 characters from the ninth character and the characters preceding it. Changes to these symbols allow flexible mapping of the DMRS at a time position or interval suitable, for example, to improve the accuracy of channel estimation at mobile station 200.

[0127] <Example 1-4 work>

In Operation Example 1-4, for example, a method will be described in which the base station 100 and the mobile station 200 determine whether the DMRS position configured for the eighth symbol (eg, m=8) in the NR interval has changed to the tenth symbol (in other words whether it has moved to the tenth character) (n=10).

[0128] In operating example 1-4, for example, the mobile station 200 may be configured to have an active BWP with a subcarrier spacing of 30 kHz (eg, the processing in step ST101 shown in FIG. 9).

[0129] In addition, the base station 100 may assign, for example, NR PDSCH 9 symbols from the fifth symbol to the thirteenth symbol in the slot, as shown in FIG. 11(a), or 10 symbols from the fourth symbol to the thirteenth symbol in the interval, as shown in FIG. 13 for the mobile station 200 (eg, the processing in step ST102 shown in FIG. 9).

[0130] In addition, for example, the base station 100 may assign a PDSCH to the active BWP with a subcarrier spacing of 30 kHz for the mobile station 200 (for example, the processing in step ST102 shown in FIG. 9).

[0131] In addition, the base station 100 may configure MU-MIMO operation based on the DMRS orthogonal port for the mobile station 200 (eg, the processing in step ST102 shown in FIG. 9).

[0132] For example, based on "Assumption 1" illustrated in FIG. 2, the DMRS position in the PDSCH is configured for the eighth symbol corresponding to l=3 in l _d= 9 or l=4 in l _d =10, as illustrated in FIG. 11(a) and 13.

[0133] In the case where the SCS for NR is 30 kHz, the time corresponding to 1 symbol is half that of SCS=15 kHz in LTE. In other words, 1 symbol with SCS=15 kHz corresponds to 2 symbols with SCS=30 kHz.

[0134] For example, as shown in FIG. 3, the fourth symbol (or eleventh symbol) in which CRS is mapped in LTE with SCS=15 kHz corresponds to 2 symbols of the eighth and ninth symbols in NR with SCS=30 kHz. Accordingly, for example, in the eighth and ninth symbols in an NR interval with SCS=30 kHz, the CRS may be mapped at a position corresponding to the fourth symbol (or eleventh symbol) with SCS=15 kHz. Conversely, the CRS cannot be matched at the tenth symbol in an NR interval with SCS=30 kHz (which corresponds, for example, to the fifth symbol or twelfth symbol with SCS=15 kHz). Accordingly, collision between the DMRS in the NR PDSCH and the LTE CRS can be prevented by configuring the DMRS position in the NR slot with SCS=30 kHz for the tenth symbol (in other words, changing it or shifting it by the tenth symbol) different from, for example, the eighth symbol.

[0135] In operating example 1 to 4, for example, if the content specified in the configuration information of the mobile station 200 satisfies at least one of the conditions (1) to (3), (5) and (6) , described in Operation Example 1-1, and conditions (4)' and (7)' described below, the base station 100 and the mobile station 200 decide that the DMRS position corresponds to the tenth symbol different from the eighth symbol, as shown in FIG. 14(a) and 14(b) (eg, processing in steps ST103 and ST107 shown in FIG. 9).

[0136] Condition (4)': "Active BWP with subcarrier spacing (SCS) of 30 kHz is used in mobile station 200"

As described above, in the case that the SCS for NR is 30 kHz, the DMRS in the NR PDSCH and the LTE CRS may interfere with each other in the eighth symbol in the NR slot.

[0137] Accordingly, if condition (4)' is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the tenth symbol other than the eighth symbol (for example, the symbol after one symbol with SCS=15 kHz ).

[0138] Condition (7)': "The mapping assignment of PDSCH type B is indicated by the DCI received by the mobile station 200, and the assignment is "9 symbols from the fifth symbol to the thirteenth symbol" or "10 symbols from the fourth symbol to the thirteenth symbol »

As described above, when assigning a type B PDSCH by mapping, the DMRS in the PDSCH may be mapped in the eighth symbol corresponding to l=3 in the case where the length of the PDSCH is correspondingly 9 symbols (for example, I _d =9, as shown in FIG. 2), and l=4 in the case where the length of the PDSCH is 10 symbols (eg, I _d =10, as shown in FIG. 2).

Additionally, as described above, the CRS may be matched at the fourth symbol or the eleventh symbol in an interval with SCS=15 kHz, which corresponds to the eighth symbol with SCS=30 kHz. Accordingly, in the case that a Type B PDSCH mapping is configured and the PDSCH length is 9 symbols and 10 symbols, the DMRS in the NR PDSCH and the LTE CRS may interfere with each other in the eighth symbol in the NR slot.

[0139] Accordingly, if condition (7)' is satisfied, the base station 100 and the mobile station 200 may decide that the DMRS position corresponds to the tenth symbol other than the eighth symbol (for example, the symbol after one symbol with SCS=15 kHz ).

[0140] The base station 100 and the mobile station 200 may make a determination to decide that the DMRS position corresponds to the eighth symbol or the tenth symbol based on, for example, any one or more of conditions (1)-(3), (4 )', (5), (6) and (7)'.

[0141] According to work example 1-4, for example, in the case that the DMRS in the NR PDSCH and the LTE CRS may conflict with each other, the base station 100 and the mobile station 200 decide that the DMRS position in the NR PDSCH corresponds to the tenth symbol (otherwise in other words, changes or shifts the DMRS position on the NR PDSCH by the tenth symbol) in which the DMRS does not collide with the CRS, based on the information configured for the mobile station 200. This DMRS position decision avoids collision between the DMRS on the NR PDSCH and the LTE CRS even in the case where the SCS in NR is different from the SCS in LTE.

[0142] In addition, for example, if at least one of the conditions (1)-(3), (4)', (5), (6) and (7)' described above is satisfied, the base station 100 and mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be used for mobile station 200.

[0143] For example, base station 100 performs a DMRS shift for each of a plurality of mobile stations 200 for which orthogonal DMRS-based MU-MIMO is used. In addition, each mobile station 200 for which MU-MIMO based on orthogonal DMRS is used determines, on the assumption that a DMRS offset can be performed to prevent collision between DMRS and CRS at another mobile station 200 to be multiplexed by MU-MIMO, that the DMRS shift is also performed for each mobile station 200 as described above. In the case where MU-MIMO based on orthogonal DMRS is used for each mobile station 200 as described above, the above definition can accordingly reduce the degradation of orthogonality between DMRS ports corresponding to a plurality of mobile stations 200.

[0144] Considering the above, example 1-4 allows, for example, to avoid conflict between DMRS and CRS. In addition, work example 1-4 allows orthogonality to be maintained, for example, between DMRS ports.

[0145] It should be noted that although the case of m=8 and n=10 was described in Example 1-4 of the work, the position of the DMRS after the change (in other words, after the shift) is not limited to the tenth character, but may correspond to, for example, the eleventh character , or the twelfth character or subsequent character, or may correspond to the seventh character, or the sixth character or the character preceding it. Changes to these symbols allow flexible mapping of the DMRS at a time position or interval suitable, for example, to improve the accuracy of channel estimation at mobile station 200.

[0146] As described above, in Working Examples 1-1 to 1-4, a case in which the DMRS position is determined based on the DMRS position and the CRS position, which can be configured for the mobile station 200 in issue 16, has been described as examples. . In other words, in operating examples 1-1 to 1-4, the base station 100 and the mobile station 200 are able to identify a symbol in which the DMRS and CRS may conflict with each other, or a symbol in which the DMRS and CRS cannot conflict with each other. , for example, based on configuration information of the mobile station 200.

[0147] For example, the conditions described in Operating Examples 1-1 to 1-4 are independent of whether the symbol in which the CRS is matched and the symbol configured for the DMRS overlap (in other words, conflict) with each other for the mobile station 200. Accordingly, if the above-described conditions are satisfied in Operation Examples 1-1 to 1-4, the base station 100 and the mobile station 200 are capable of, for example, maintaining orthogonality between DMRS ports corresponding to a plurality of mobile stations 200, subjected to MU-MIMO multiplexing, respectively, by changing the DMRS mapping, even if the CRS and DMRS do not actually conflict with each other.

[0148] <Work example 1-5>

In Operation Example 1-5, for example, an operation example will be described in which the base station 100 and the mobile station 200 cannot determine whether a collision occurs between the DMRS and the CRS based on the configuration information of the mobile station 200.

[0149] For example, in Operation Example 1-5, a method will be described in which the base station 100 and the mobile station 200 determine whether the DMRS position configured for any symbol in the NR interval is changed (in other words, shifted) to another symbol.

[0150] In operating example 1-5, for example, an active BWP with a subcarrier spacing of 15 kHz, 30 kHz, or 60 kHz may be configured for the mobile station 200 (for example, the processing in step ST101 shown in FIG. 9).

[0151] In addition, for example, the base station 100 may assign an NR PDSCH to a frequency band in which the LTE CRS can be transmitted, and any time resource in the slot for the mobile station 200 (for example, the processing in step ST102 shown in FIG. 9) .

[0152] In addition, for example, the base station 100 may assign a PDSCH to the active BWP with a subcarrier spacing of 15 kHz, 30 kHz, or 60 kHz for the mobile station 200 (for example, the processing in step ST102 shown in FIG. 9).

[0153] In addition, the base station 100 may configure MU-MIMO operation based on the DMRS orthogonal port for the mobile station 200 (eg, the processing in step ST102 shown in FIG. 9).

[0154] For example, the DMRS position in the PDSCH configured based on "Assumption 1" illustrated in FIG. 2 is called the “xth symbol”.

[0155] The base station 100 determines, for example, whether the DMRS position has changed (in other words, moved) by a symbol (hereinafter referred to as the “y-th symbol”) different from the x-th symbol configured for the mobile station 200 (e.g., processing at step ST103 shown in FIG.9). For example, in the event that the symbol in which the CRS is mapped and the x-th symbol configured for the mobile station 200 overlap with each other, the base station 100 may decide that the DMRS position corresponds to a y-th symbol other than x- th symbol.

[0156] For example, base station 100 may determine, based on LTE CRS information (eg, CRS mapping information) and resource information configured for mobile station 200 (eg, frequency domain and time domain resource allocation information relative to the PDSCH ), whether the symbol in which the CRS is matched and the xth symbol in which the DMRS is matched overlap each other.

In other words, the base station 100 determines whether the CRS and DMRS may conflict with each other in the x-th symbol. For example, in the event that the base station 100 determines that the CRS and the DMRS may conflict with each other, the base station 100 may determine that the condition for the DMRS offset is “true.”

[0157] In the event that the condition for DMRS shift is true (ST103: YES), the base station 100 decides that the DMRS position corresponds to the y-th symbol (in other words, changes or shifts the DMRS position to the y-th symbol ), different from the x-th character (ST104). For example, in symbols after the x-th symbol, base station 100 may match the DMRS in the y-th symbol (in other words, may shift the DMRS to the y-th symbol) having a lower symbol number among the symbols in which the DMRS does not conflict with the CRS.

[0158] It should be noted that if there is no symbol among the symbols after the x-th symbol in which the DMRS does not conflict with the CRS, the base station 100 may match the DMRS at the x-th symbol (in other words, does not shift the DMRS).

[0159] In addition, the mobile station 200 determines, for example, whether a change has been made to a position (y-th symbol) other than the DMRS position (x-th symbol) configured based on the control signal indicated by the base station 100 (for example, processing at step ST107 shown in FIG.9). For example, in the event that the symbol in which the CRS is mapped and the x-th symbol configured for the mobile station 200 overlap with each other, the mobile station 200 may decide that the DMRS position corresponds to a y-th symbol other than x- th symbol.

[0160] For example, in the same manner as in the base station 100, the mobile station 200 determines, based on the LTE CRS information and the assignment information for the PDSCH configured for the mobile station 200, whether they overlap with each other (in other words, conflict). or) the symbol in which the CRS is matched, and the xth symbol in which the DMRS is matched. For example, in the event that the mobile station 200 determines that the CRS and the DMRS may conflict with each other, the mobile station 200 may determine that the condition for the DMRS offset is “true.”

[0161] In the event that the condition for DMRS shift is true (ST107: YES), the mobile station 200 determines that it has been decided that the DMRS position corresponds to the yth symbol (in other words, the DMRS position has been changed or shifted to the y-th character) different from the x-th character (ST108). For example, mobile station 200 may determine that in the symbols after the x-th symbol, the DMRS has been mapped to the y-th symbol (in other words, shifted to the y-th symbol) having a lower symbol number among the symbols in which the DMRS does not conflict with CRS.

[0162] It should be noted that if there is no symbol among the symbols after the x-th symbol in which the DMRS does not conflict with the CRS, the base station 100 may determine that the DMRS has been matched at the x-th symbol (in other words, may determine that the DMRS is not shifted).

[0163] According to operating example 1-5, for example, in the case that the DMRS in the NR PDSCH and the LTE CRS may conflict with each other, the base station 100 and the mobile station 200 decide that the DMRS position in the NR PDSCH corresponds to another symbol(s). in other words, changes or shifts the position of the DMRS in the NR PDSCH to another symbol) in which the DMRS does not conflict with the CRS. This DMRS position decision avoids collision between DMRS in NR PDSCH and LTE CRS.

[0164] It should be noted that the subcarrier spacing configured for the mobile station 200 is not limited to 15 kHz, 30 kHz, and 60 kHz and may be any other value.

[0165] Moreover, in operation example 1-5, in the symbols following the x-th symbol, the y-th symbol is not limited to the symbol having the lowest value among the symbols in which the DMRS does not conflict with the CRS, and may be, for example , the symbol where the DMRS does not conflict with the CRS, the symbol having the second lowest value, or the symbol having the third lowest value, etc. Alternatively, the y-th symbol may be a symbol that precedes the x-th symbol and in which the DMRS does not conflict with the CRS. Changes to these symbols allow flexible mapping of the DMRS at a time position or interval suitable, for example, to improve the accuracy of channel estimation at mobile station 200.

[0166] In addition, the base station 100 and the mobile station 200 can determine whether the DMRS position configured for the mobile station 200 has changed based on whether the content specified in the configuration information of the mobile station 200 satisfies at least one of the conditions ( 1), (3), (5) and (8) described above, for example, in addition to determining whether DMRS and CRS may conflict with each other.

[0167] In addition, for example, if at least one of the conditions (1), (3), (5) and (8) described above is satisfied, the base station 100 and the mobile station 200 may determine that Orthogonal DMRS-based MU-MIMO may be used for mobile station 200. For example, base station 100 performs a DMRS shift for each of a plurality of mobile stations 200 for which orthogonal DMRS-based MU-MIMO is used. In addition, each mobile station 200 for which MU-MIMO based on orthogonal DMRS is used determines, on the assumption that a DMRS offset can be performed to prevent collision between DMRS and CRS at another mobile station 200 to be multiplexed by MU-MIMO, that the DMRS shift is also performed for each mobile station 200 as described above. In the case where MU-MIMO based on orthogonal DMRS is used for each mobile station 200 as described above, the above definition can accordingly reduce the degradation of orthogonality between DMRS ports corresponding to a plurality of mobile stations 200.

[0168] Examples of implementing DMRS matching have been described above.

[0169] As described above, in the present embodiment, the base station 100 and the mobile station 200 decide to match the DMRS in the NR PDSCH based on, for example, information configured for the mobile station 200 (in other words, information that allows LTE CRS matching, subject to identification). This DMRS mapping decision allows the base station 100 using the DSS to match the DMRS accordingly and avoids, for example, a collision between the DMRS and the CRS. Additionally, this DMRS mapping decision allows orthogonality to be maintained, for example, between DMRS ports. In addition, even if DSS is used, the mobile station 200 is able to appropriately determine the DMRS mapping and receive the NR PDSCH.

[0170] (Change 1 of Embodiment 1)

In the case where DMRSs are mapped across a plurality of symbols in a slot in Embodiment 1, the base station 100 and mobile station 200 may simultaneously change (in other words, shift) the plurality of symbols at which the DMRSs are mapped.

[0171] For example, if the DMRS provisions in “Assumption 1” illustrated in FIG. 2 correspond to the eighth and eleventh symbols, the base station 100 and the mobile station 200 may change the DMRS positions to the ninth symbol and the twelfth symbol, respectively.

[0172] This change in DMRS mapping avoids conflict between multiple DMRSs and CRSs.

[0173] (Change 2 of Embodiment 1)

In Embodiment 1, for example, LTE system information (eg, RRC RateMatchPatternLTE-CRS parameter) of which the mobile station 200 is indicated by the base station 100 in the processing in step ST101 illustrated in FIG. 9 may be CRS information in an LTE component carrier (CC) used in any of the following bands:

(1) the system NR component carrier band in which the base station 100 and the mobile station 200 operate;

(2) any BWP configured for mobile station 200;

(3) an active BWP used for transmission to the mobile station 200; And

(4) the band assigned to the PDSCH to be transmitted to the mobile station 200.

[0174] In addition, in the case where there are multiple LTE component carriers among the bands described above, the base station 100 may indicate to the mobile station 200 parameter(s) containing CRS information in one or multiple LTE component carriers.

[0175] For example, in the case where multiple parameters are specified, the base station 100 and mobile station 200 may determine based on one or multiple parameters whether the position of the DMRS has changed (for example, the processing in steps ST103 and ST107 shown in FIG. 9) .

[0176] In addition, the base station 100 and the mobile station 200 can also determine based on one or more of a variety of parameters whether the DMRS position has changed. For example, the base station 100 and the mobile station 200 may operate based on a parameter including a larger number of CRS ports among a plurality of parameters, or may operate based on a parameter in which a subframe other than MBSFN is configured more frequently. With these operations, the position of the DMRS is determined taking into account the circumstances in which the CRSs can be mapped across more resources, for example, so that the possibility of conflict between the CRS and the DMRS can be reduced.

[0177] In addition, the base station 100 may also indicate to the mobile station 200 a parameter based on which it is determined whether the DMRS position has changed.

[0178] (Change 3 of Embodiment 1)

In Embodiment 1, the condition for determining whether the DMRS position has changed may be information known to the base station 100 and the mobile station 200, or may be information about which mobile station 200 is indicated by the base station 100 by a control signal such as , such as a higher level signal or DCI.

[0179] Alternatively, the mobile station 200 may be indicated by the base station 100 with information containing the result of determining whether the DMRS position has changed using a control signal such as a higher layer signal or DCI.

[0180] Such an indication allows the mobile station 200 to accurately determine whether the DMRS position transmitted by the base station 100 has been changed.

[0181] (Change 4 of Embodiment 1)

In Embodiment 1, operation of the mobile station 200 using MU-MIMO based on a DMRS port orthogonal port may be indicated implicitly, for example, by an antenna port mapping-related DCI that indicates that “all remaining orthogonal antenna ports are not associated with transfer of the PDSCH to another UE."

[0182] (Change 5 of Embodiment 1)

In Embodiment 1, the DMRS position received by the mobile station 200 for which MU-MIMO based on orthogonal DMRS is not used may be shifted, as shown in FIG. 15, which can reduce the degradation of reception accuracy due to, for example, DMRS collision between cells.

[0183] (Change 6 of Embodiment 1)

In Embodiment 1, the parameter included in the conditions of the respective operating examples described above is not limited to the RateMatchPatternLTE-CRS parameter, but may be, for example, a parameter associated with at least a CRS or an MBSFN subframe and included in a control signal such as a higher-level parameter or DCI with a name other than RateMatchPatternLTE-CRS, or the like.

[0184] (Embodiment 2)

For example, in the case where a plurality of DMRSs are mapped in an interval, changing the position of a DMRS that may conflict with a CRS as described in Embodiment 1 may result in a change in the positional relationship (e.g., timing) between the DMRS whose position has been changed and other DMRS (in other words, DMRS whose position has not been changed).

[0185] For example, the longer the time interval between DMRSs, the more the inter-DMRS channel estimation accuracy may deteriorate.

[0186] In addition, for example, the shorter the time interval between DMRSs, the smaller the effect of matching DMRSs across multiple symbols may be. In other words, the shorter the time interval between DMRSs, the more resource consumption increases due to DMRSs and the lower the resource efficiency may be.

[0187] In the present embodiment, a DMRS matching method that can prevent degradation of channel estimation accuracy and a DMRS matching method that can improve resource efficiency will be described.

[0188] It should be noted that the base station and the mobile station according to the present embodiment are common to the base station 100 and the mobile station 200 according to Embodiment 1 in terms of basic configurations.

[0189] Next, implementation examples, respectively, of DMRS matching according to the present embodiment will be described.

[0190] <Work Example 2-1>

In Operation Example 2-1, for example, if DMRSs are mapped across multiple symbols in a slot, the base station 100 and the mobile station 200 change (in other words, shift), in addition to the position of the DMRS, which may conflict with the CRS, the position A DMRS that does not conflict with the CRS.

[0191] As an example, a case will be described where the NR PDSCH is assigned to 9 symbols from the fifth symbol to the thirteenth symbol in the BWP with a subcarrier spacing of 15 kHz for the mobile station 200, as shown in FIG. 16(a).

[0192] In this case, for example, based on “Assumption 1” shown in FIG. 2, the DMRS positions in the PDSCH are configured for the fifth, eighth and eleventh symbols (l=0, 3, 6).

[0193] In addition, for example, the base station 100 and the mobile station 200 determine that CRSs can be matched in at least the seventh, eighth, and eleventh symbols in the interval, as shown in FIG. 3.

[0194] In this case, the base station 100 and the mobile station 200 determine that the DMRS and CRS may conflict with each other, for example, in the eighth and eleventh symbols.

[0195] Accordingly, base station 100 may change (in other words, shift) the positions of the DMRS that may be mapped in the eighth and eleventh symbols, and the position of the DMRS that may be mapped in, for example, the fifth symbol. For example, base station 100 may change the DMRS at the fifth, eighth, and eleventh symbols shown in FIG. 16(a) to the sixth, ninth and twelfth signals, respectively, as shown in FIG. 16(b).

[0196] Moreover, in the same manner as in the base station 100, the mobile station 200 can determine that the DMRS from the fifth, eighth and eleventh symbols shown in FIG. 16(a) are matched in the sixth, ninth and twelfth symbols, respectively, as shown in FIG. 16(b).

[0197] In Operation Example 2-1, for example, if at least one DMRS position changes in a plurality of DMRSs in an interval, the base station 100 and the mobile station 200 change the positions of the remaining DMRSs based on the specified DMRS position (in other words, there is a change in position). For example, as shown in FIG. 16(a) and 16(b), three DMRS in the PDSCH are shifted back one symbol, respectively, from the positions configured for the mobile station 200 (eg, positions based on “Assumption 1”). In other words, as shown in FIG. 16(b), the matching span between DMRSs after the change (eg, 3 symbols) is not different from the matching span between DMRSs before the change (eg, 3 symbols).

[0198] Since such DMRS mapping does not change the time domain mapping gap among multiple DMRSs even if the positions of the DMRSs change, deterioration in channel estimation accuracy may not occur due to the DMRS.

[0199] <Example 2-2 work>

In operating example 2-2, for example, if DMRSs are matched on multiple symbols in an interval, base station 100 and mobile station 200 decide not to transmit (in other words, discard) one of the two DMRSs with a time interval equal to the threshold value or less than the threshold value in the DMRS comparison (in other words, their position after the change) for which the decision is made.

[0200] As an example, a case will be described where the NR PDSCH is assigned to 9 symbols from the fifth symbol to the thirteenth symbol in the BWP with a subcarrier spacing of 30 kHz for the mobile station 200, as shown in FIG. 17(a).

[0201] Here, the threshold value associated with the time interval between DMRS for determining whether the DMRS is discarded is 1 symbol. It should be noted that the specified threshold is not limited to 1 character and can be 2 or more characters.

[0202] In this case, for example, based on “Assumption 1” shown in FIG. 2, the DMRS positions in the PDSCH are configured for the fifth, eighth and eleventh symbols (l=0, 3, 6).

[0203] Additionally, for example, base station 100 and mobile station 200 determine that LTE CRS (eg, with 15 kHz SCS) can be matched on at least the eighth symbol in the slot. In this case, the base station 100 and the mobile station 200 determine that the DMRS and CRS may conflict with each other, for example, in the eighth symbol.

[0204] Accordingly, the base station 100 and mobile station 200 decide that the DMRS position corresponds to the tenth symbol (in other words, change or shift the DMRS position by the tenth symbol) other than, for example, the eighth symbol. In this case, the DMRS mapping that is decided upon corresponds to the fifth, tenth, and eleventh characters.

[0205] In this case, since the gap between the DMRSs that may be matched in the tenth and eleventh symbols is equal to or less than the threshold value (1 symbol), the base station 100 and the mobile station 200 may decide to discard the DMRS that may be mapped at the tenth symbol, for example, as shown in FIG. 17(b).

[0206] Accordingly, as shown in FIG. 17(b), the base station 100 may transmit DMRS on the fifth and eleventh symbols, and the mobile station 200 may receive DMRS on the fifth and eleventh symbols.

[0207] In addition, for example, base station 100 may transmit another signal (eg, PDSCH) in the tenth symbol in which DMRS is discarded, as shown in FIG. 17(b).

[0208] For example, if DMRS is mapped in the eleventh symbol as shown in FIG. 17(b), the channel estimation accuracy is comparable to that of DMRS matching in the tenth and eleventh symbols. In Operation Example 2-2, DMRS is discarded at the tenth symbol, as shown in FIG. 17(b), for example, to prevent channel estimation accuracy from deteriorating and to prevent increased resource consumption due to DMRS. In addition, since another signal is mapped in the tenth symbol in which the DMRS is discarded, resource efficiency can be improved.

[0209] It should be noted that although in FIG. 17(b), the case of discarding the DMRS in the tenth symbol has been described; between DMRSs that may be matched in the tenth and eleventh symbols with a gap that is equal to or less than a threshold value, the DMRS to be discarded may be the DMRS in the eleventh symbol.

[0210] The above is a description of each of the embodiments of the present invention.

[211] (Other embodiments)

In each embodiment described above, downlink communication is assumed in which the base station is a transmitting apparatus and the mobile station is a receiving apparatus. However, the embodiment of the present invention is not limited to this and can be applied to uplink communication in which the mobile station is a transmitting apparatus and the base station is a receiving apparatus, or to communication between mobile stations, i.e. to direct connection communication.

[0212] In addition, in each of the above embodiments, a case is described where the number of configuration symbols in the interval is 14 symbols. However, the number of configuration characters in the interval is not limited to 14 characters, but may have some other value (for example, 12 characters).

[0213] In addition, in each of the above embodiments, a case is described where the position (eg, symbol) of the DMRS is changed (in other words, shifted). However, the signal whose position is changed is not limited to DMRS, but may be any other signal. Moreover, in each of the above embodiments, a case has been described in which conflict between the DMRS and the CRS is prevented by deciding the position of the DMRS. However, the signal for which conflict with the DMRS is considered is not limited to the CRS, but may be some other signal other than the CRS. For example, instead of at least one of DMRS and CRS, an embodiment of the present invention may be applied to the reference signals, channels or other signals in NR or LTE specified below:

• phase tracking reference signal (PT-RS, PTRS);

• reference signal with information about the channel state (Channel State Information Reference Signal, CSI-RS);

• sounding reference signal (Sounding Reference Signal, SRS);

• Tracking Reference Signal (TRS);

• discovery reference signal (Discovery Reference Signal, DRS);

• primary synchronization signal (PSS);

• secondary synchronization signal (Secondary Synchronization Signal, SSS);

• physical downlink control channel (PDCCH);

• Physical Downlink Shared Channel (PDSCH);

• physical uplink control channel (PUCCH);

• Physical Uplink Shared Channel (PUSCH);

• physical broadcast channel (PBCH);

• physical format transmission channel (Physical Control Format Indicator Channel, PCFICH);

• physical channel for HARQ transmission (Physical HARQ Indicator Channel, PHICH); And

• physical multicast channel (Physical Multicast Channel, RMSN).

[0214] Moreover, in each embodiment described above, the PDSCH mapping method is not limited to Type B PDSCH mapping. The PDSCH mapping method may be, for example, Type A PDSCH mapping or some other mapping method. An embodiment of the present invention can be applied in a case where DMRS and CRS may conflict with each other regardless of, for example, the PDSCH mapping method.

[0215] Moreover, in each embodiment described above, when the position of the DMRS is changed (in other words, shifted), its position may be changed to a different frequency position. For example, a DMRS belonging to a particular DMRS CDM group may have its frequency position changed to match another DMRS CDM group. In this way, their conflict with the CRS can be prevented more flexibly.

[0216] In addition, in each embodiment described above, the “higher layer signal” may also be referred to, for example, as “RRC signaling” or “MAC signaling”.

[0217] Moreover, in each embodiment described above, the “reference signal” may also be referred to, for example, as a “standard signal” or a “pilot signal.” Additionally, DMRS may also be referred to as "DM-RS".

[0218] Moreover, in each embodiment described above, a temporary resource block is not limited to a slot and a symbol, but may be any other temporary resource block, such as, for example, a frame, a subframe, or a subslot.

[219] The present invention may be implemented using software, hardware, or software in conjunction with hardware. Each functional block used in the description of each embodiment presented above may be partially or completely implemented by a large integrated circuit (LSI) such as an integrated circuit, and each process described in each embodiment may be partially or completely controlled by one and the same LSI or combination of LSI-LSI may be separately manufactured in the form of chips, or a single chip may be manufactured to include part of the functional blocks or all of the functional blocks. The LSI may include data input and output coupled thereto. LSI in the present case may be referred to as integrated circuit, system LSI, super-LSI or super-LSI depending on the degree of integration. However, the implementation method of an integrated circuit is not limited to LSI and can be implemented using a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, a Field Programmable Gate Array (FPGA) can be used, which can be programmed after the LSI is manufactured, or a reconfigurable processor, in which the connections and settings of circuit cells located within the LSI can be changed. . The present invention may be implemented as digital processing or analog processing. If future integrated circuit technology replaces LSI as a result of developments in semiconductor technology or other derivative technology, the functional blocks may be integrated using the future integrated circuit technology. In addition, biotechnology can be applied.

[0220] The present invention can be implemented using any type of apparatus, device or system having a communication function, which are called communication devices. The communication device may include a transceiver and processing/control circuitry. The transceiver may include a receiver and a transmitter and/or function as a receiver and a transmitter. The transmitter-receiver transceiver may include a radio frequency (RF) module including amplifiers, RF modulators/demodulators, and the like, and one or more antennas. Non-limiting examples of such communication devices include telephone (e.g., cell phone, smartphone), tablet, personal computer (PC) (e.g., laptop, desktop, netbook), camera (e.g., digital camera/video camera), digital player (digital audio/video player), wearable device (e.g. wearable camera, smart watch, tracking device), game console, digital e-reader, telehealth/medicine device (remote healthcare and medicine) and a vehicle with communication functionality (for example, a car, an aircraft, a ship), as well as various combinations thereof.

[0221] A communications apparatus is not limited to a portable or wearable apparatus and may also include any type of apparatus, device, or system that is not portable or stationary, such as a smart home device (e.g., appliance, lighting fixture, smart meter, control panel ), a vending machine and any other “physical objects” in the “Internet of Things (IoT)” network.

[0222] Communications may include the exchange of data, for example, through a cellular system, a wireless LAN system, a satellite system, etc., as well as various combinations thereof.

[223] The communication apparatus may include a device, such as a controller or sensor, that is coupled to a communication device that performs the communication function described in the present invention. For example, the communication device may include a controller or sensor that generates control signals or data signals used by the communication device performing the communication function of the communication device.

[224] A communications apparatus may also include an infrastructure entity, such as a base station, an access point, and any other apparatus, device, or system configured to communicate with or control apparatuses, such as those described in the above examples that do not have restrictive.

[0225] A receiving apparatus according to an embodiment of the present invention includes: a control circuit that, in operation, decides to match a second reference signal based on information that allows the first reference signal to be identified to be matched; and a receiving circuit that, in operation, receives a second reference signal based on the decision decision.

[0226] In one embodiment of the present invention, if the content specified in the information satisfies a certain condition, the control circuit decides that the position of the second reference signal corresponds to a symbol other than the symbol configured for the receiving apparatus.

[0227] In one embodiment of the present invention, the condition does not depend on whether the symbol in which the first reference signal is mapped and the symbol configured for the second reference signal for the receiving apparatus overlap with each other.

[0228] In one embodiment of the present invention, if the first symbol in which the first reference signal is associated and the second symbol configured for the second reference signal for the receiving apparatus overlap with each other, the control circuit decides whether that the position of the second reference signal corresponds to a third symbol different from the second symbol based on the specified information.

[0229] In one embodiment of the present invention, the control circuit determines whether the first symbol and the second symbol overlap with each other based on the assignment information of the data including the second reference signal and the mapping information of the first reference signal.

[0230] In one embodiment of the present invention, if the content specified in the information satisfies a certain condition, the control circuit decides that the position of the second reference signal corresponds to the third symbol.

[0231] In one embodiment of the present invention, the condition does not depend on whether the first symbol and the second symbol overlap with each other.

[0232] In one embodiment of the present invention, if the position of at least one reference signal of the plurality of second reference signals changes, the control circuit changes the position of the remaining reference signal based on the position of the at least one reference signal.

[0233] In one embodiment of the present invention, the control circuit decides not to transmit either of two of a plurality of second reference signals, wherein two of the plurality of second reference signals are signals with a time interval equal to or less than a threshold value in the DMRS mapping , in respect of which the decision was made.

[0234] A transmitting apparatus according to one embodiment of the present invention includes: a control circuit that, in operation, decides to match a second reference signal based on information that allows the first reference signal to be identified to be matched; and a transmission circuit that, in operation, transmits the second reference signal with the association that has been decided upon.

[0235] A receiving method according to one embodiment of the present invention includes: making a decision by the receiving apparatus to match a second reference signal based on information that allows the first reference signal to be identified to be matched; and receiving, by the receiving apparatus, a second reference signal based on the decision decision.

[0236] A transmission method according to one embodiment of the present invention includes: making a decision by a transmitting apparatus to match a second reference signal based on information that allows the first reference signal to be identified to be matched; and transmitting, by the transmitting apparatus, a second reference signal with the comparison for which the decision has been made.

[0237] The disclosure of Japanese Patent Application No. 2019-149144, filed August 15, 2019, including technical description, drawings and abstract, is incorporated herein by reference in its entirety.

Industrial applicability

[0238] An embodiment of the present invention can be applied to mobile communication systems.

List of reference items

[0239]

100 Base station

101, 206 Controller

102 Encoder/modulator

103 Signal matcher

104 Transmitter

105, 201 Antenna

200 Mobile station

202 Receiver

203 Signal separator

204 Channel estimator

205 Demodulator/decoder.

Claims (31)

1. Receiving apparatus containing: a control circuit that, in operation, decides to map a second reference signal on a downlink physical shared channel in a second system based on information that allows the first reference signal to be mapped on a first system to be identified; And a receiving circuit that, in operation, receives a second reference signal based on a decision decision, wherein the first reference signal is a cell-specific reference signal, and the first system is an LTE standard system, wherein the second reference signal is a demodulation reference signal, and the second system is a new radio access technology system, characterized in that in case the position of at least one reference signal of the plurality of second reference signals changes, the control circuit changes the position of the remaining reference signal based on the position of the at least one reference signal. 2. The receiving apparatus according to claim 1, wherein if the content specified in the information satisfies a certain condition, the control circuit decides that the position of the second reference signal corresponds to a symbol different from the symbol configured for the receiving apparatus. 3. The receiving apparatus according to claim 2, wherein the condition does not depend on whether the symbol in which the first reference signal is mapped and the symbol configured for the second reference signal for the receiving apparatus overlap with each other. 4. The receiving apparatus according to claim 1, wherein if the first symbol in which the first reference signal is mapped and the second symbol configured for the second reference signal for the receiving apparatus overlap with each other, the control circuit decides whether that the position of the second reference signal corresponds to a third symbol different from the second symbol based on the specified information. 5. The receiving apparatus according to claim 4, wherein the control circuit determines whether the first symbol and the second symbol overlap with each other based on the assignment information of the data including the second reference signal and the mapping information of the first reference signal. 6. The receiving apparatus according to claim 4, wherein if the content specified in the information satisfies a certain condition, the control circuit decides that the position of the second reference signal corresponds to the third symbol. 7. The receiving apparatus according to claim 6, wherein the condition does not depend on whether the first symbol and the second symbol overlap with each other. 8. The receiving apparatus of claim 1, wherein the control circuit decides not to transmit either of two of the plurality of second reference signals, wherein two of the plurality of second reference signals are signals with a time interval equal to or less than a threshold value in comparison in respect of which the decision was made. 9. Transmitting apparatus containing: a control circuit that, in operation, decides to map a second reference signal on a downlink physical shared channel in a second system based on information that allows the first reference signal to be mapped on a first system to be identified; And a transmission circuit that, in operation, transmits a second reference signal with a decision-related association, wherein the first reference signal is a cell-specific reference signal, and the first system is an LTE standard system, wherein the second reference signal is a demodulation reference signal, and the second system is a new radio access technology system, characterized in that in case the position of at least one reference signal of the plurality of second reference signals changes, the control circuit changes the position of the remaining reference signal based on the position of the at least one reference signal. 10. Method of administration, including: making a decision by the receiving apparatus to map a second reference signal on a downlink physical shared channel in a second system based on information that allows the first reference signal to be identified to be mapped on the first system; And reception by the receiving apparatus of the second reference signal based on the comparison in respect of which the decision has been made, wherein the first reference signal is a cell-specific reference signal, and the first system is an LTE standard system, wherein the second reference signal is a demodulation reference signal, and the second system is a new radio access technology system, characterized in that in case the position of at least one reference signal of the plurality of second reference signals is changed, the position of the remaining reference signal is changed based on the position of the at least one reference signal. 11. Method of transmission, including: making a decision by the transmitting apparatus to map a second reference signal on a downlink physical shared channel in a second system based on information that allows the first reference signal to be identified to be mapped on the first system; And transmission by the transmitter of a second reference signal with a comparison in respect of which a decision has been made, wherein the first reference signal is a cell-specific reference signal, and the first system is an LTE standard system, wherein the second reference signal is a demodulation reference signal, and the second system is a new radio access technology system, characterized in that in case the position of at least one reference signal of the plurality of second reference signals is changed, the position of the remaining reference signal is changed based on the position of the at least one reference signal.