Receiving device, sending device, receiving method and sending method

Abstract

The mobile station includes: a control circuit that determines a configuration of a second reference signal in a second system based on information that can determine a configuration of a first reference signal in a first system; and a receiving circuit that receives the second reference signal based on the determined configuration.

Description

Technical Field

[0001] The present disclosure relates to a receiving device, a sending device, a receiving method and a sending method. Background Art

[0002] A communication system called the "fifth generation mobile communication system (5G)" has been studied. The 3rd Generation Partnership Project (3GPP), an international standardization organization, has studied the advancement of the 5G communication system from two aspects: the advancement of the LTE (Long Term Evolution) / LTE-Advanced (Advanced Long Term Evolution) system and the new method that may not be backward compatible with the LTE / LTE-Advanced system, namely the new radio access technology (New Radio Access Technology) (also called "New RAT" or "NR") (for example, refer to non-patent document 1).

[0003] In NR, a technology (for example, DSS: Dynamic Spectrum Sharing) has been studied for allowing the NR system and the LTE system to coexist in the same frequency band and communicate (for example, refer to Non-Patent Document 2).

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: RP-181726, "Revised WID on New Radio Access Technology", NTT DOCOMO, September 2018

[0007] Non-patent document 2: RP-191042, "Enhancements for dynamic spectrum sharing in Rel-16", Ericsson, June 2019

[0008] Non-patent document 3: RP-191599, "Enhancements for dynamic spectrum sharing in Rel-16", Ericsson, June 2019

[0009] Non-patent document 4: 3GPP TS 38.211 V15.6.0, "NR; Physical channels and modulation (Release 15)," 2019-06

[0010] Non-patent document 5: 3GPP TS 38.331 V15.6.0, "NR; Radio Resource Control (RRC) protocol specification (Release 15)," 2019-06

[0011] Non-patent document 6: 3GPP TS 38.214 V15.6.0, "NR; Physical layer procedures for data (Release 15)," 2019-06 Summary of the invention

[0012] However, the configuration method of reference signals has not been fully studied.

[0013] The non-limiting embodiments of the present disclosure help to provide a receiving apparatus, a transmitting apparatus, a receiving method, and a transmitting method that can appropriately configure a reference signal.

[0014] A receiving device according to an embodiment of the present disclosure includes: a control circuit, which determines the configuration of a second reference signal in a second system based on information that can determine the configuration of a first reference signal in a first system; and a receiving circuit, which receives the second reference signal based on the determined configuration.

[0015] It should be noted that these general or specific aspects may be implemented by a system, an apparatus, a method, an integrated circuit, a computer program or a recording medium, or may be implemented by any combination of systems, apparatuses, methods, integrated circuits, computer programs and recording media.

[0016] According to one embodiment of the present disclosure, the reference signal can be appropriately configured.

[0017] More advantages and effects of an embodiment of the present disclosure will be explained through the description and drawings. These advantages and / or effects are provided by several embodiments, and the features described in the description and drawings, but not necessarily all of them need to be provided in order to obtain one or more of the same features. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing an example of DSS.

[0019] Figure 2This is a diagram showing an example of PDSCH (Physical Downlink Shared Channel) mapping type (mapping type) B.

[0020] Figure 3 It is a block diagram showing a configuration example of a CRS (Cell-specific Reference Signal).

[0021] Figure 4 It is a diagram showing an example of multi-user multiple-input multiple-output (orthogonal DMRS (Demodulation Reference Signal) based MU-MIMO (Multi-User Multiple-Input Multiple-Output)) and DSS based on an orthogonal demodulation reference signal.

[0022] Figure 5 This is a block diagram showing a configuration example of a part of a base station.

[0023] Figure 6 This is a block diagram showing a configuration example of a part of a mobile station.

[0024] Figure 7 It is a block diagram showing a structural example of a base station.

[0025] Figure 8 This is a block diagram showing a configuration example of a mobile station.

[0026] Fig. 9 This is a flowchart showing an example of operations of a base station and a mobile station.

[0027] Fig.10 This is a diagram showing an example of signal arrangement in operation example 1-1.

[0028] Fig.11 This is a diagram showing an example of signal arrangement in Operation Example 1-2.

[0029] Fig.12 This is a diagram showing an example of signal arrangement in operation example 1-3.

[0030] Fig.13 This is a diagram showing an example of signal arrangement in operation example 1-4.

[0031] Fig.14 This is a diagram showing an example of signal arrangement in operation example 1-4.

[0032] Fig.15 This is a diagram showing an operation example when MU-MIMO using orthogonal DMRS is not applied.

[0033] Fig.16 This is a diagram showing an example of signal configuration in Action Example 2-1.

[0034] Fig.17 This is a diagram showing a configuration example of signals in Action Example 2-2. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0036] [Dynamic Spectrum Sharing (DSS)]

[0037] In DSS, the NR system and the LTE system can coexist in the same frequency band and communicate at the same time.

[0038] For example, in the application of DSS in Release 15 (hereinafter referred to as "Rel-15"), a channel for LTE can be configured in a downlink subframe of LTE within the frequency band (or, referred to as "carrier") of LTE. Figure 1 As shown, in the downlink subframe of LTE, control signals for LTE and reference signals for LTE (e.g., CRS: Cell-specific Reference Signal) can be configured in more than one codeword (e.g., Orthogonal Frequency Division Multiplexing (OFDM) codeword) starting from the front end, and downlink data channels for LTE (e.g., LTE PDSCH: Physical Downlink Shared Channel) and CRS for LTE can be configured in the remaining OFDM codewords.

[0039] In the DSS, for example, during the OFDM symbol period of the LTE PDSCH, such as Figure 1 As shown in FIG. 1 , LTE PDSCH can be configured in a part of the frequency band, and the downlink control channel (NR PDCCH: Physical Downlink Control Channel) or downlink data channel (NR PDSCH, Physical Downlink Shared Channel) for NR can be configured in other frequency bands. In other words, each channel of LTE PDSCH and NR can also be divided by frequency. However, as Figure 1 As shown, CRS (or, sometimes also referred to as "LTE CRS") can be transmitted in the frequency band of each channel configured with NR in addition to the frequency band of the LTE PDSCH.

[0040] For example, regarding DSS, a mapping method for introducing a PDSCH with a length of 9 OFDM symbols and 10 OFDM symbols (e.g., referred to as "NR PDSCH mapping type B") has been proposed (e.g., refer to non-patent document 3). For example, in the mapping method of the PDSCH, the position of the NR reference signal (e.g., the demodulation reference signal (DMRS)) can be defined or set to the position of a symbol that does not conflict with a symbol including an LTE CRS. By introducing the NR PDSCH mapping type B, the utilization efficiency of the DSS is improved.

[0041] However, Rel-15 (for example, refer to Non-Patent Document 4) does not specify such PDSCH mapping, and the configuration of DMRS in the PDSCH has not yet been fully studied.

[0042] Therefore, in one embodiment of the present disclosure, a method for configuring DMRS in PDSCH is described.

[0043] [DMRS mapping]

[0044] As an example of a method for configuring DMRS in an uplink data channel (e.g., PUSCH: Physical Uplink Shared Channel), non-patent document 4 (e.g., Section 6.4.1.1.3) specifies a method for configuring DMRS within NR PUSCH mapping type B with a length of 9 OFDM symbols and 10 OFDM symbols.

[0045] For example, the same configuration method as the configuration method of the DMRS in the NR PDSCH mapping type B can be applied to the DMRS in the NR PDSCH mapping type B with a length of 9 OFDM symbols and 10 OFDM symbols in the downlink data channel (e.g., PDSCH). Figure 2 For example, Figure 2The "additional position of DMRS (dmrs-AdditionalPosition)" shown is a high-level parameter (e.g., also referred to as a "radio resource control (RRC) parameter") indicating the position of DMRS (in other words, additional DMRS). DMRS-AdditionalPosition is notified (in other words, configured) to a mobile station (e.g., also referred to as a "terminal" or "UE: UserEquipment") by, for example, a base station (e.g., also referred to as a "gNB").

[0046] Below, we will Figure 2 The configuration method of DMRS shown in FIG. 1 is called “Assumption 1”. Figure 2 In the assumption 1 shown in the figure, at length l d =9 or 10, DMRS can be configured in the front codeword (or starting codeword) "l0" of the scheduled PDSCH in the time slot and the codeword indicated by "dmrs-AdditionalPosition" (for example, setting l0 to the reference (=0) position).

[0047] [NRDMRS shift]

[0048] As described above, in DSS, for example, NR PDSCH can be transmitted in the frequency band in which LTE CRS is transmitted. In this case, DMRS and LTE CRS in NR PDSCH can be designed in a manner that does not conflict in time resources and frequency resources (for example, refer to non-patent document 3).

[0049] For example, in the case where the LTE CRS conflicts with the DMRS in the NR PDSCH configured based on "Assumption 1", the base station may transmit the DMRS at a position different from the position of the DMRS configured based on "Assumption 1" (in other words, the resource position). Here, for example, the process of changing the position of the DMRS to a position different from the position configured based on "Assumption 1" is sometimes referred to as "DMRS shift".

[0050] [CRS Mapping]

[0051] The symbols (in other words, the positions in the time domain) where CRS is configured in the LTE subframe vary, for example, depending on the number of CRS ports or the type of subframe. The types of subframes include, for example, multimedia broadcast service single frequency network (MBSFN) subframes and non-MBSFN subframes. Figure 3 An example of a method for configuring CRS is shown. For example, in an MBSFN subframe where the number of CRS ports is 1 or 2, CRS is transmitted in four symbols, namely, symbol 0, symbol 4, symbol 7, and symbol 11. In addition, for example, in an MBSFN subframe where the number of CRS ports is 4, CRS is transmitted in six symbols, namely, symbol 0, symbol 1, symbol 4, symbol 7, symbol 8, and symbol 11. In addition, for example, in a non-MBSFN subframe, CRS is transmitted in one symbol, namely, symbol 0, or in two symbols, namely, symbol 0 and symbol 1.

[0052] In addition, the first codeword in the subframe or time slot is set as "0th codeword" here.

[0053] In addition, the position and port number of CRS in the frequency domain and the timing of MBSFN subframes can be set to the mobile station through, for example, higher layer parameters (for example, RRC parameters "Rate Match Pattern LTE-CRS").

[0054] [Multi-user multiple input multiple output (MU-MIMO)]

[0055] In MU-MIMO for multiple mobile stations, there is an application in which the NR DMRS ports between the mobile stations are orthogonal to each other (for example, referred to as "orthogonal DMRS-based MU-MIMO"). In the case of orthogonal DMRS-based MU-MIMO, for example, Figure 4 As shown, it can be assumed that the NR DMRS ports between mobile station A and mobile station B are orthogonal to each other.

[0056] Here, for example, when DSS is applied to mobile station A but not to mobile station B, a situation (not shown) occurs where DMRS shift is applied to mobile station A but not to mobile station B. In this case, the positions of DMRS are different between mobile station A and mobile station B, so the orthogonality between DMRS ports is deteriorated.

[0057] In addition, for example, in Rel-15, the DCI (Downlink Control Information) related to the antenna port mapping notifies the mobile station that "all the remaining orthogonal antenna ports are not associated with the transmission of PDSCH to another UE", thereby implicitly notifying the relevant mobile station to use MU-MIMO based on orthogonal DMRS (for example, refer to non-patent document 6).

[0058] (Implementation Method 1)

[0059] [Overview of Communication System]

[0060] The communication system of this embodiment includes a base station (equivalent to a transmission device) 100 and a mobile station (equivalent to a reception device) 200 .

[0061] In this embodiment, for example, the following method is described, that is, the base station 100 and the mobile station 200 determine whether to change the codeword configured with DMRS in the time slot (for example, called "NR time slot") for sending an NR signal (for example, PDSCH) in the downlink to a codeword different from the set codeword (for example, the codeword based on assumption 1) (in other words, shift it).

[0062] This determination allows the base station 100 and the mobile station 200 to suppress collision between DMRS and CRS even when MU-MIMO using orthogonal DMRS is applied to the mobile station 200. In addition, the base station 100 and the mobile station 200 can suppress deterioration in orthogonality of DMRS ports between the mobile stations 200.

[0063] Figure 5 is a block diagram showing a configuration example of a part of the base station 100 according to the present embodiment. Figure 5 In the base station 100 shown, the control unit 101 (e.g., equivalent to a control circuit) determines the configuration of a second reference signal (e.g., DMRS) in a second system (e.g., NR system) based on information that can determine the configuration of a first reference signal (e.g., CRS) in a first system (e.g., LTE system). The transmission unit 104 (e.g., equivalent to a transmission circuit) transmits the second reference signal in the determined configuration.

[0064] Figure 6 2 is a block diagram showing a configuration example of a part of the mobile station 200 according to the present embodiment. Figure 6In the mobile station 200 shown, the control unit 206 (e.g., equivalent to the control circuit) determines the configuration of the second reference signal (e.g., DMRS) in the second system (e.g., NR system) based on the information that can determine the configuration of the first reference signal (e.g., CRS) in the first system (e.g., LTE system). The receiving unit 202 (e.g., equivalent to the receiving circuit) receives the second reference signal based on the determined configuration.

[0065] [Structure of base station]

[0066] Figure 7 is a block diagram showing a configuration example of the base station 100 according to this embodiment. Figure 7 In the figure, the base station 100 includes a control unit 101, a coding / modulation unit 102, a signal configuration unit 103, a transmission unit 104 and an antenna 105.

[0067] The control unit 101 generates a higher layer signal (e.g., RRC parameters) including parameters set for the mobile station 200, and outputs it to the coding / modulation unit 102. The higher layer signal may include, for example, information related to the LTE CRS (e.g., RateMatchPatternLTE-CRS) or information related to the frequency band set for the mobile station 200 (e.g., active BWP: Bandwidth part).

[0068] In addition, the control unit 101 determines information related to data (e.g., PDSCH). For example, the control unit 101 determines the active BWP for sending PDSCH, the allocation area of ​​PDSCH (e.g., called "PDSCH area"), or decides whether to use MU-MIMO based on orthogonal DMRS port (orthogonal DMRS port based MU-MIMO). Next, the control unit 101 outputs downlink control information (e.g., DCI: Downlink Control Information) to the signal configuration unit 103, and the downlink control information includes information that explicitly (explicitly) or implicitly (implicitly) notifies the determined information. In addition, the control unit 101 outputs (in other words, indicates) the determined PDSCH area to the signal configuration unit 103.

[0069] In addition, the control unit 101 determines whether to start from a reference position (for example, a position associated with the PDSCH region. For example, Figure 2 The control unit 101 changes the position of the DMRS in the PDSCH (for example, the position of the symbol) (in other words, shifts it) according to the position of the assumption 1 shown in FIG. 1 . The control unit 101 outputs information related to the determined position of the DMRS to the signal configuration unit 103 .

[0070] The coding / modulation unit 102 performs error correction coding and modulation on data (eg, PDSCH) and a higher layer signal input from the control unit 101 , and outputs the modulated signal to the signal configuration unit 103 .

[0071] The signal configuration unit 103 configures (in other words, allocates or maps) the DCI input from the control unit 101, for example, to the resources in the PDCCH region. In addition, the signal configuration unit 103 configures the DMRS and the signal input from the coding / modulation unit 102 to the resources in the PDSCH region. The signal configuration unit 103 outputs the signal configured in the resource to the transmission unit 104.

[0072] The transmission unit 104 performs wireless transmission processing such as frequency conversion using a carrier wave on the signal input from the signal configuration unit 103 , and outputs the signal after the wireless transmission processing to the antenna 105 .

[0073] The antenna 105 radiates the signal (in other words, the downlink signal) input from the transmission unit 104 toward the mobile station 200 .

[0074] [Structure of mobile station]

[0075] Figure 8 2 is a block diagram showing a configuration example of the mobile station 200 according to the present embodiment. Figure 8 In the embodiment, the mobile station 200 includes an antenna 201, a receiving unit 202, a signal separation unit 203, a channel estimation unit 204, a demodulation / decoding unit 205 and a control unit 206.

[0076] Antenna 201 receives the base station 100 (for example, see Figure 7 ) and outputs it to the receiving unit 202.

[0077] The receiving unit 202 performs wireless reception processing such as frequency conversion on the signal input from the antenna 201 , and outputs the signal after the wireless reception processing to the signal separation unit 203 .

[0078] The signal separation unit 203 extracts (in other words, separates) DCI of resources allocated in the PDCCH region from the signal input from the receiving unit 202, and outputs the DCI to the control unit 206. In addition, the signal separation unit 203 extracts (in other words, separates) the data signal and DMRS allocated in the resources in the PDSCH region based on the information indicating the resources in the PDSCH region and the information indicating the position of the DMRS input from the control unit 206. The signal separation unit 203 outputs the data signal to the demodulation / decoding unit 205, and outputs the DMRS to the channel estimation unit 204.

[0079] The channel estimation unit 204 performs channel estimation (for example, calculates a channel estimation value) based on the DMRS input from the signal separation unit 203 . The channel estimation unit 204 outputs information indicating the channel estimation value to the demodulation / decoding unit 205 .

[0080] The demodulation / decoding unit 205 demodulates and decodes the data signal input from the signal separation unit 203 based on the channel estimation value input from the channel estimation unit 204. The demodulation / decoding unit 205 outputs the higher layer signal obtained by decoding to the control unit 206.

[0081] The control unit 206 determines, for example, the position of the PDSCH region and the DMRS associated with the PDSCH region based on the higher layer signal input from the demodulation / decoding unit 205 and the DCI input from the signal separation unit 203 .

[0082] In addition, the control unit 206 determines whether the reference position (for example, Figure 2 The position of the DMRS in the PDSCH (eg, the position of the symbol) is changed (in other words, it is shifted) as shown in the assumption 1.

[0083] The control unit 206 outputs the information on the PDSCH region and the information on the position of the DMRS to the signal separation unit 203 .

[0084] [Operation Example of Base Station 100 and Mobile Station 200]

[0085] Next, the base station 100 (see Figure 7 ) and mobile station 200 (refer to Figure 8 ) action example.

[0086] Fig. 9 This is a flowchart showing an example of processing by the base station 100 and the mobile station 200 .

[0087] The base station 100 notifies (in other words, sets) a higher layer signal to the mobile station 200 (ST101). The mobile station 200 receives the uplink layer signal notified by the base station 100.

[0088] The higher layer signal may include, for example, information related to the LTE CRS (e.g., RateMatchPatternLTE-CRS) or information related to the allocated frequency band (e.g., activated BWP) for the mobile station 200. In addition, for example, the information related to the activated BWP may include information related to the subcarrier spacing (SCS: Sub Carrier Spacing) set for the mobile station 200. In addition, this information may be notified to the mobile station 200 through at least one of the higher layer parameters and the downlink control information (e.g., DCI), or may be pre-set to the mobile station 200.

[0089] The base station 100 determines the content of DCI to be notified to the mobile station 200 (ST102). The DCI may include the following information, for example.

[0090] <PDSCH allocation information>

[0091] The PDSCH allocation information may include, for example, information related to frequency domain resources for allocating PDSCH (eg, mapping type B) and information such as time domain resources for configuring PDSCH (eg, starting symbol and symbol length).

[0092] <PDSCH transmission frequency band information>

[0093] The transmission band information of the PDSCH may include, for example, information related to the BWP for transmitting the PDSCH (for example, information related to the subcarrier spacing).

[0094] <Information about MU-MIMO based on orthogonal DMRS ports>

[0095] The information related to MU-MIMO based on orthogonal DMRS ports may include, for example, information indicating whether MU-MIMO based on orthogonal DMRS ports is applied to the mobile station 200. The information related to MU-MIMO based on orthogonal DMRS ports may be notified to the mobile station 200 explicitly by the base station 100, or may be notified to the mobile station 200 implicitly.

[0096] In addition, the information contained in DCI is not limited to the above information, but may also be other information.

[0097] The base station 100 determines whether to set (in other words, change or shift) the position of the DMRS in the PDSCH to a position that is consistent with the set position (for example, Figure 2 For example, the base station 100 may determine whether the condition for shifting the DMRS is "true" or "false".

[0098] When it is determined that the DMRS should be shifted (ST103: YES), the base station 100 determines the position of the DMRS to be, for example, the nth symbol different from the mth symbol configured for the mobile station 200 (ST104). In other words, the position of the DMRS configured for the mobile station 200 is shifted from the mth symbol to the nth symbol.

[0099] On the other hand, when determining not to shift the DMRS (ST103: NO), the base station 100 does not change the position of the DMRS (does not shift it).

[0100] Base station 100 transmits a downlink signal to mobile station 200 (ST105). The downlink signal may include, for example, at least one of a PDSCH including DMRS and a PDCCH including DCI. DMRS is arranged at a position (for example, a symbol) determined by base station 100, for example.

[0101] Mobile station 200 receives a downlink signal transmitted from base station 100 and checks information (in other words, content) indicated by DCI in PDCCH included in the downlink signal (ST106). For example, mobile station 200 can determine that the position of DMRS is set to the mth symbol based on the allocation information of PDSCH.

[0102] The mobile station 200 determines whether the position of the DMRS in the PDSCH has been set (in other words, changed or shifted) to a position (for example, the nth symbol) different from the set position (for example, the mth symbol) based on the received higher layer signal and the information indicated by the DCI (ST107). For example, the mobile station 200 can determine whether the condition for shifting the DMRS is "true" or "false".

[0103] When it is determined that the DMRS should be shifted (ST107: YES), the mobile station 200 determines the position of the DMRS to be, for example, the nth symbol different from the mth symbol configured for the mobile station 200 (ST108). In other words, the position of the DMRS configured for the mobile station 200 is shifted from the mth symbol to the nth symbol.

[0104] On the other hand, when determining that the position of the DMRS is not to be shifted (ST107: No), the mobile station 200 does not change the position of the DMRS (does not shift it).

[0105] The mobile station 200 performs reception processing (for example, demodulation processing) of the PDSCH based on, for example, the DMRS arranged at the determined position (ST109).

[0106] Next, operation examples of DMRS configuration according to this embodiment are described respectively.

[0107] <Action Example 1-1>

[0108] In Action Example 1-1, for example, a method is described in which the base station 100 and the mobile station 200 determine whether to change (in other words, shift) the position of the DMRS set to the 11th codeword (for example, m=11) in the NR time slot to the 12th codeword (n=12).

[0109] As an example, the following situation is described, that is, if Fig.10 As shown in (a) of FIG. 1 , the NR PDSCH for the mobile station 200 is allocated to 9 symbols from the 5th symbol to the 13th symbol in the time slot. In this case, for example, if based on Figure 2 Assumption 1, then Fig.10 As shown in (a), the position of the DMRS in the PDSCH is set to the 11th symbol corresponding to l=6.

[0110] In addition, for example, Figure 3 In the example, the CRS may be configured in the 11th symbol in the time slot, but not in the 12th symbol. Thus, for example, by setting (in other words, changing or shifting) the position of the DMRS to the 12th symbol different from the 11th symbol, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be suppressed.

[0111] For example, when the content indicated by the setting information of the mobile station 200 satisfies at least one of the following conditions, Fig.10 As shown in (b), the base station 100 and the mobile station 200 determine the position of the DMRS to be a 12th symbol different from the 11th symbol set for the mobile station 200 (for example, Fig. 9 In other words, in Fig. 9 In the processing of ST103 and ST107 shown, the base station 100 and the mobile station 200 can determine that the condition for shifting the DMRS is "true" when the content indicated by the information set for the mobile station 200 (for example, information that can determine (or estimate) the configuration of the LTE CRS) satisfies the following conditions.

[0112] Condition (1): "Mobile station 200 is not operating in an unlicensed band (e.g., also referred to as "NR-unlicensed (NR-U)")"

[0113] The frequency band of NR set for mobile station 200 (for example, a licensed band or an unlicensed band) can be notified to mobile station 200 by base station 100 through control information (for example, a higher layer signal or DCI), or can be set for mobile station 200.

[0114] For example, it is conceivable that the DSS is not used in the unlicensed band. Therefore, when the mobile station 200 is used in the unlicensed band, the DMRS contained in the NR signal of the mobile station 200 will not conflict with the LTE CRS, and therefore, the position of the DMRS (for example, the 11th symbol) may not be changed in the NR PDSCH.

[0115] On the other hand, in licensed bands, DSS can be applied, so that, for example, Figure 3 As shown, it is possible to configure the CRS in the 11th symbol in the time slot. Therefore, if the mobile station 200 is not used in the unlicensed band, it can be determined that the LTE CRS and the DMRS will overlap.

[0116] Thus, for example, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol when the condition (1) is satisfied. In other words, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol when the mobile station 200 is used in the licensed frequency band.

[0117] Condition (2): "RRC parameter RateMatchPatternLTE-CRS is set for mobile station 200"

[0118] For example, when RateMatchPatternLTE-CRS is set for the mobile station 200, the LTE CRS may be set in the LTE system, so the DMRS in the NR PDSCH may overlap with the LTE CRS. Figure 3 As shown, CRS can be configured in the 11th codeword in the time slot. Therefore, it can be determined that in the 11th codeword, the DMRS in the NR PDSCH and the LTE CRS will overlap.

[0119] Therefore, when condition (2) is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol.

[0120] Condition (3): "The RRC parameter RateMatchPatternLTE-CRS is set for the mobile station 200, and the timing of the MBSFN subframe set by the RRC parameter does not coincide with the timing of DMRS transmission"

[0121] For example, Figure 3 As shown, in the MBSFN subframe, CRS can be configured in the 0th codeword or the 1st codeword. Therefore, when the timing of the MBSFN subframe coincides with the timing of sending the DMRS, the DMRS in the PDSCH will not conflict with the LTE CRS. Therefore, in the NR PDSCH, the position of the DMRS (for example, the 11th codeword) may not be changed.

[0122] On the other hand, when the timing of the MBSFN subframe does not coincide with the timing of transmitting the DMRS, for example, when the timing of the non-MBSFN subframe coincides with the timing of transmitting the DMRS, Figure 3As shown, CRS can be configured in the 11th codeword, so it can be determined that the DMRS in the PDSCH will conflict with the LTE CRS.

[0123] Thus, when condition (3) is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol.

[0124] As described above, in the MBSFN subframe, DMRS is not arranged in the 11th symbol. Therefore, condition (3) is a condition in which the possibility of collision between DMRS and CRS is higher than condition (2).

[0125] Condition (4): "An activated BWP with a subcarrier spacing (SCS) of 15 kHz is used in the mobile station 200"

[0126] When the SCS set for the mobile station 200 in the NR system is 15 kHz, that is, when the subcarrier spacing is the same as that of the LTE system, for example, Figure 3 As shown, it can be determined that in the 11th codeword, the DMRS in the NR PDSCH and the LTE CRS will conflict.

[0127] Thus, when condition (4) is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol.

[0128] Condition (5): "MU-MIMO based on orthogonal DMRS ports is applied to the mobile station 200"

[0129] For example, when MU-MIMO based on orthogonal DMRS ports is notified to the mobile stations 200 via DCI, if the position of DMRS is changed for at least one of the multiple mobile stations 200 multiplexed with MU-MIMO, the orthogonality of DMRS between the multiple mobile stations 200 will deteriorate.

[0130] As a result, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol when the condition (5) is satisfied.

[0131] In other words, when condition (5) is satisfied, the position of the DMRS for the plurality of mobile stations 200 using MU-MIMO based on orthogonal DMRS ports is set to symbol 12. By setting this DMRS, for example, even when the position of the DMRS for the mobile station 200 using DSS is changed, the position of the DMRS for the other mobile stations 200 multiplexed by MU-MIMO is also changed, so that the deterioration of the orthogonality of the DMRS between the plurality of mobile stations 200 can be suppressed.

[0132] For example, in Figure 4 In the example shown, when mobile station B is notified of the application of MU-MIMO based on orthogonal DMRS ports, even if DSS is not applied to mobile station B, mobile station B can consider the possibility of applying DSS to other mobile stations A multiplexed with MU-MIMO and determine the position of DMRS to be the 12th codeword.

[0133] Furthermore, condition (5) may be defined as, for example, “it is implied that the DCI received by the mobile station 200 is MU-MIMO based on orthogonal DMRS ports”.

[0134] Condition (6): "The DCI received by the mobile station 200 notifies allocation using PDSCH mapping type B"

[0135] In an allocation using PDSCH mapping type B, for example, Figure 2 As shown in l d =9, the DMRS in the PDSCH can be configured in the 11th symbol corresponding to l=6. Figure 3 As shown, CRS can be configured in the 11th codeword in the time slot. Therefore, when PDSCH mapping type B is set, in the 11th codeword, the DMRS in the NR PDSCH will conflict with the LTE CRS.

[0136] Thus, when condition (6) is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol.

[0137] Condition (7): "The DCI received by the mobile station 200 notifies allocation using PDSCH mapping type B, and the allocation is '9 symbols from symbol 5 to symbol 13'"

[0138] In the allocation using PDSCH mapping type B as described in condition (6), when the length of PDSCH is 9 symbols (e.g., Figure 2 The l shown d =9), the DMRS in the PDSCH may be configured in the 11th symbol corresponding to l=6. Figure 3 As shown, CRS can be configured in the 11th codeword in the time slot. Therefore, when PDSCH mapping type B is set, in the 11th codeword, the DMRS in the NR PDSCH will conflict with the LTE CRS.

[0139] Thus, when condition (7) is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 12th symbol different from the 11th symbol.

[0140] For example, Figure 2 As shown, in a single symbol DMRS, the length of the PDSCH is 10 symbols (e.g., Figure 2 The l shown d =10), DMRS is not arranged in the 11th symbol (corresponding to l=7). Therefore, condition (7) is a condition in which the possibility of collision between DMRS and CRS is higher than condition (6).

[0141] In the above, conditions (1) to (7) are described respectively.

[0142] The base station 100 and the mobile station 200 can determine whether the position of the DMRS is to be the 11th symbol or the 12th symbol based on one or more of the conditions (1) to (7), for example.

[0143] According to action example 1-1, for example, when the DMRS in the NR PDSCH conflicts with the LTE CRS based on information set for the mobile station 200, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the DMRS in the NR PDSCH to the 12th symbol that does not conflict with the CRS. By determining the DMRS position, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be avoided.

[0144] Furthermore, for example, when at least one of the above conditions (1) to (7) is satisfied, the base station 100 and the mobile station 200 may determine that MU-MIMO using orthogonal DMRS can be applied to the mobile station 200 .

[0145] For example, the base station 100 performs DMRS shift on each of the multiple mobile stations 200 using MU-MIMO based on orthogonal DMRS. In addition, each mobile station 200 using MU-MIMO based on orthogonal DMRS assumes that DMRS shift will be performed on other mobile stations 200 multiplexed by MU-MIMO to avoid the conflict between DMRS and CRS, and thus determines to perform DMRS shift on the mobile station 200. Through this judgment, when MU-MIMO based on orthogonal DMRS is applied to the mobile station 200, the deterioration of the orthogonality of the DMRS ports corresponding to the multiple mobile stations 200 can be reduced.

[0146] Based on the above, according to operation example 1-1, for example, collision between DMRS and CRS can be avoided. In addition, according to operation example 1-1, for example, orthogonality between DMRS ports can be maintained.

[0147] In addition, in operation example 1-1, the case of m=11 and n=12 is described, but the position of the DMRS after the change (in other words, after the shift) is not limited to the 12th codeword, for example, it can be a codeword after the 13th codeword, or a codeword before the 10th codeword or the 9th codeword. By changing to these codewords, for example, the DMRS can be flexibly arranged at a time position or interval suitable for improving the channel estimation accuracy in the mobile station 200.

[0148] <Action Example 1-2>

[0149] In action example 1-2, for example, a method is described in which the base station 100 and the mobile station 200 determine whether to change (in other words, shift) the position of the DMRS set to the 8th codeword (for example, m=8) in the NR time slot to the 9th codeword (for example, n=9).

[0150] As an example, the following situation is described, that is, if Fig.11 As shown in (a) of FIG. 1 , the NRPDSCH for the mobile station 200 is allocated to 9 symbols from the 5th symbol to the 13th symbol in the time slot. In this case, for example, if based on Figure 2 Assumption 1, then Fig.11 As shown in (a), the position of the DMRS in the PDSCH is set to the 8th symbol corresponding to l=3.

[0151] In addition, for example, Figure 3 In the example, the CRS may be configured in the 8th symbol in the time slot, but not in the 9th symbol. Thus, for example, by setting (in other words, changing or shifting) the position of the DMRS to the 9th symbol different from the 8th symbol, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be suppressed.

[0152] In action example 1-2, for example, when the content indicated by the setting information of the mobile station 200 satisfies at least one of the conditions (1) to (7) described in action example 1-1 and the following condition (8), as follows Fig.11 As shown in (b), the base station 100 and the mobile station 200 determine the position of the DMRS to be a 9th symbol different from the 8th symbol set for the mobile station 200 (for example, Fig. 9 Processing of ST103 and ST107 shown).

[0153] Condition (8):

[0154] Condition (8) is the case where "RRC parameter RateMatchPatternLTE-CRS is set for mobile station 200, the number of CRS ports set by the RRC parameter is 4, and the timing of the MBSFN subframe set by the RRC parameter does not coincide with the transmission timing of the DMRS."

[0155] An example of a situation that satisfies condition (8) is a situation where the timing of the non-MBSFN subframe coincides with the timing of DMRS transmission. Figure 3 As shown, in a non-MBSFN subframe where the number of CRS ports is 4, CRS can be configured in the 8th codeword. Therefore, in the 8th codeword, the DMRS in the NR PDSCH and the LTE CRS will overlap.

[0156] As a result, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 9th symbol different from the 8th symbol when the condition (8) is satisfied.

[0157] The base station 100 and the mobile station 200 may determine whether to determine the position of the DMRS to be the 8th symbol or the 9th symbol based on one or more of the conditions (1) to (8), for example.

[0158] According to action example 1-2, for example, when the DMRS in the NR PDSCH conflicts with the LTE CRS based on information set for the mobile station 200, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the DMRS in the NR PDSCH to the 9th symbol that does not conflict with the CRS. By determining the DMRS position, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be avoided.

[0159] Furthermore, for example, when at least one of the above conditions (1) to (8) is satisfied, the base station 100 and the mobile station 200 may determine that MU-MIMO using orthogonal DMRS can be applied to the mobile station 200 .

[0160] For example, the base station 100 performs DMRS shift on each of the multiple mobile stations 200 using MU-MIMO based on orthogonal DMRS. In addition, each mobile station 200 using MU-MIMO based on orthogonal DMRS assumes that DMRS shift will be performed on other mobile stations 200 multiplexed by MU-MIMO to avoid the conflict between DMRS and CRS, and thus determines to perform DMRS shift on the mobile station 200. Through this judgment, when MU-MIMO based on orthogonal DMRS is applied to the mobile station 200, the deterioration of the orthogonality of the DMRS ports corresponding to the multiple mobile stations 200 can be reduced.

[0161] Based on the above, according to operation example 1-2, for example, collision between DMRS and CRS can be avoided. In addition, according to operation example 1-2, for example, orthogonality between DMRS ports can be maintained.

[0162] In addition, in operation example 1-2, the case of m=8 and n=9 is described, but the position of the DMRS after the change (in other words, after the shift) is not limited to the 9th codeword, for example, it can be a codeword after the 10th codeword or the 11th codeword, or it can be a codeword before the 7th codeword or the 6th codeword. By changing to these codewords, for example, the DMRS can be flexibly arranged at a time position or interval suitable for improving the channel estimation accuracy in the mobile station 200.

[0163] <Action Example 1-3>

[0164] In action example 1-3, for example, a method is described in which the base station 100 and the mobile station 200 determine whether to change (in other words, shift) the position of the DMRS (in other words, double symbol DMRS) set to the 10th codeword and the 11th codeword (for example, m=10 and 11) in the NR time slot to the 12th codeword and the 13th codeword (for example, n=12 and 13).

[0165] As an example, the following situation is described, that is, if Fig.12 As shown in (a) of FIG. 1 , the NR PDSCH for the mobile station 200 is allocated to 9 symbols from the 5th symbol to the 13th symbol in the time slot. In this case, for example, if based on Figure 2 Assumption 1, then Fig.12 As shown in (a) of FIG. 5 , the position of the DMRS in the PDSCH is set to the 10th symbol and the 11th symbol corresponding to l=5.

[0166] In addition, for example, Figure 3 In the example, the CRS may be configured in the 8th symbol in the time slot, but not in the 9th symbol. Thus, for example, by setting (in other words, changing or shifting) the position of the DMRS to the 9th symbol different from the 8th symbol, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be suppressed.

[0167] In action example 1-3, for example, when the content indicated by the setting information of the mobile station 200 satisfies at least one of the conditions (1) to (7) described in action example 1-1, Fig.12 As shown in (b), the base station 100 and the mobile station 200 determine the position of the DMRS to be the 12th and 13th symbols different from the 10th and 11th symbols set for the mobile station 200 (for example, Fig. 9Processing of ST103 and ST107 shown).

[0168] The base station 100 and the mobile station 200 can determine whether to determine the position of the DMRS to be the 10th and 11th symbols or the 12th and 13th symbols based on one or more of the conditions (1) to (7).

[0169] According to action example 1-3, for example, when the DMRS in the NR PDSCH conflicts with the LTE CRS based on the information set for the mobile station 200, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the dual-symbol DMRS in the NR PDSCH to the 12th symbol and the 13th symbol that do not conflict with the CRS. By determining the DMRS position, the conflict between the dual-symbol DMRS in the NR PDSCH and the LTE CRS can be avoided.

[0170] In addition, similar to action example 1-1, for example, when at least one of the above conditions (1) to (7) is satisfied, the base station 100 and the mobile station 200 can determine that MU-MIMO based on orthogonal DMRS can be applied to the mobile station 200.

[0171] For example, the base station 100 performs DMRS shift on each of the multiple mobile stations 200 using MU-MIMO based on orthogonal DMRS. In addition, each mobile station 200 using MU-MIMO based on orthogonal DMRS assumes that DMRS shift will be performed on other mobile stations 200 multiplexed by MU-MIMO to avoid the conflict between DMRS and CRS, and thus determines to perform DMRS shift on the mobile station 200. Through this judgment, when MU-MIMO based on orthogonal DMRS is applied to the mobile station 200, the deterioration of the orthogonality of the DMRS ports corresponding to the multiple mobile stations 200 can be reduced.

[0172] Based on the above, according to operation example 1-3, for example, collision between dual-symbol DMRS and CRS can be avoided. In addition, according to operation example 1-3, for example, orthogonality between DMRS ports can be maintained.

[0173] In addition, in operation example 1-3, the case where m=10 and 11, and n=12 and 13 are described, but the position of the DMRS after the change (in other words, after the shift) is not limited to the 12th and 13th symbols, for example, it may be the 9th and 10th symbols, or two symbols before the 9th symbol. By changing to these symbols, for example, the DMRS can be flexibly arranged at a time position or interval suitable for improving the channel estimation accuracy in the mobile station 200.

[0174] <Action Example 1-4>

[0175] In action example 1-4, for example, a method is described in which the base station 100 and the mobile station 200 determine whether to change (in other words, shift) the position of the DMRS set to the 8th codeword (for example, m=8) in the NR time slot to the 10th codeword (for example, n=10).

[0176] In operation example 1-4, for example, an activated BWP having a subcarrier spacing of 30 kHz may be set for the mobile station 200 (for example, Fig. 9 (processing of ST101 shown).

[0177] In addition, the base station 100 may allocate the NRPDSCH to the mobile station 200, for example, Fig.11 9 symbols from the 5th to the 13th symbol in the time slot shown in (a), or Fig.13 The 10 symbols from the 4th symbol to the 13th symbol in the time slot shown (for example, Fig. 9 (processing of ST102 shown).

[0178] In addition, for example, the base station 100 may allocate the PDSCH to the activated BWP (eg, Fig. 9 (processing of ST102 shown).

[0179] In addition, the base station 100 may configure the mobile station 200 to use MU-MIMO based on orthogonal DMRS ports (for example, Fig. 9 (processing of ST102 shown).

[0180] For example, if based on Figure 2 Assumption 1, then Fig.11 (a) and Fig.13 As shown, the position of the DMRS in the PDSCH is set to correspond to l d = 9 in l = 3 or l d =The 8th codeword with l=4 in =10.

[0181] When the SCS of NR is 30kHz, the time equivalent to 1 symbol is half of the SCS of LTE = 15kHz. In other words, 1 symbol of SCS = 15kHz is equivalent to 2 symbols of SCS = 30kHz.

[0182] For example, in Figure 3In the example, the 4th symbol (or the 11th symbol) in which CRS is configured in LTE with SCS=15kHz is equivalent to two symbols, namely the 8th symbol and the 9th symbol in NR with SCS=30kHz. Thus, for example, CRS can be configured at a position corresponding to the 4th symbol (or the 11th symbol) in SCS=15kHz in the 8th and 9th symbols in the NR time slot with SCS=30kHz. In contrast, CRS is not configured in the 10th symbol (for example, equivalent to the 5th symbol or the 12th symbol in SCS=15kHz) in the NR time slot with SCS=30kHz. Thus, for example, by setting (in other words, changing or shifting) the position of DMRS in the NR time slot with SCS=30kHz to the 10th symbol different from the 8th symbol, the conflict between DMRS in the NR PDSCH and LTE CRS can be suppressed.

[0183] In action example 1-4, for example, when the content indicated by the setting information of the mobile station 200 satisfies at least one of the conditions (1) to (3), (5), (6) and the following conditions (4)' and (7)' described in action example 1-1, as Fig.14 (a) and Fig.14 As shown in (b), the base station 100 and the mobile station 200 determine the position of the DMRS to be the 10th symbol different from the 8th symbol (for example, Fig. 9 Processing of ST103 and ST107 shown).

[0184] Condition (4)': "An activated BWP with a subcarrier spacing (SCS) of 30 kHz is used in the mobile station 200"

[0185] As described above, when the SCS for NR is 30kHz, in the 8th codeword in the NR time slot, the DMRS in the NR PDSCH will conflict with the LTE CRS.

[0186] Thus, when condition (4)' is satisfied, the base station 100 and the mobile station 200 can determine the position of the DMRS to be the 10th symbol different from the 8th symbol (for example, a symbol later by one symbol in SCS=15kHz).

[0187] Condition (7)': "The DCI received by the mobile station 200 notifies allocation using PDSCH mapping type B, and the allocation is '9 symbols from symbol 5 to symbol 13' or '10 symbols from symbol 4 to symbol 13'"

[0188] As described above, in an allocation using PDSCH mapping type B, the length of the PDSCH may be 9 symbols (eg, Figure 2 The l shownd =9), and the length of PDSCH is 10 symbols (for example, Figure 2 The l shown d =10) in the case where l=4 respectively corresponds to the 8th symbol in the case where SCS=30kHz. In addition, as described above, CRS can be configured in the 4th symbol or the 11th symbol in the time slot in SCS=15kHz, which is equivalent to the 8th symbol in SCS=30kHz. Therefore, when PDSCH mapping type B is set, and when the length of PDSCH is 9 symbols and 10 symbols, in the 8th symbol in the NR time slot, the DMRS in the NRPDSCH will conflict with the LTE CRS.

[0189] Thus, when condition (7)' is satisfied, base station 100 and mobile station 200 can determine the position of the DMRS to be the 10th symbol different from the 8th symbol (for example, a symbol located later by one symbol in SCS=15kHz).

[0190] For example, the base station 100 and the mobile station 200 can determine whether the position of the DMRS is the 8th or 10th codeword based on one or more of conditions (1) to (3), condition (4)', condition (5), condition (6) and condition (7)'.

[0191] According to action example 1-4, for example, when the DMRS in the NR PDSCH conflicts with the LTE CRS based on the information set for the mobile station 200, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the DMRS in the NR PDSCH to the 10th symbol that does not conflict with the CRS. By determining the DMRS position, even when the SCS of NR and the SCS of LTE are different, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be avoided.

[0192] In addition, for example, the base station 100 and the mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be applied to the mobile station 200 when at least one of the above conditions (1) to (3), (4)', (5), (6) and (7)' is met.

[0193] For example, the base station 100 performs DMRS shift on each of the multiple mobile stations 200 using MU-MIMO based on orthogonal DMRS. In addition, each mobile station 200 using MU-MIMO based on orthogonal DMRS assumes that DMRS shift will be performed on other mobile stations 200 multiplexed by MU-MIMO to avoid the conflict between DMRS and CRS, and thus determines to perform DMRS shift on the mobile station 200. Through this judgment, when MU-MIMO based on orthogonal DMRS is applied to the mobile station 200, the deterioration of the orthogonality of the DMRS ports corresponding to the multiple mobile stations 200 can be reduced.

[0194] Based on the above, according to operation example 1-4, for example, collision between DMRS and CRS can be avoided. In addition, according to operation example 1-4, for example, orthogonality between DMRS ports can be maintained.

[0195] In addition, in operation example 1-4, the case of m=8 and n=10 is described, but the position of the DMRS after the change (in other words, after the shift) is not limited to the 10th codeword, for example, it can be a codeword after the 11th codeword or the 12th codeword, or it can be a codeword before the 7th codeword or the 6th codeword. By changing to these codewords, for example, the DMRS can be flexibly arranged at a time position or interval suitable for improving the channel estimation accuracy in the mobile station 200.

[0196] As described above, in Action Examples 1-1 to 1-4, as an example, the case where the position of the DMRS is determined based on the position of the DMRS and the position of the CRS that can be set for the mobile station 200 in Rel. 16 is described. In other words, in Action Examples 1-1 to 1-4, for example, the base station 100 and the mobile station 200 can determine the codewords where the DMRS and the CRS will collide, or the codewords where the DMRS and the CRS will not collide, based on the setting information of the mobile station 200.

[0197] For example, the conditions described in Action Examples 1-1 to 1-4 do not depend on whether the symbol for configuring the CRS overlaps (in other words, conflicts) with the symbol for the DMRS configured for the mobile station 200. Therefore, in Action Examples 1-1 to 1-4, when the above conditions are met, even when the CRS and the DMRS do not actually conflict, the base station 100 and the mobile station 200 still change the configuration of the DMRS, thereby maintaining the orthogonality of the DMRS ports corresponding to the multiple mobile stations 200 performing MU-MIMO multiplexing, for example.

[0198] <Action Example 1-5>

[0199] In operation example 1-5, an operation example is described in which the base station 100 and the mobile station 200 cannot determine whether the DMRS and the CRS collide based on the setting information of the mobile station 200, for example.

[0200] For example, in Action Example 1-5, a method is described in which the base station 100 and the mobile station 200 determine whether to change (in other words, shift) the position of the DMRS set to an arbitrary symbol in the NR slot to a different symbol.

[0201] In operation example 1-5, for example, an activated BWP having a subcarrier spacing of 15 kHz, 30 kHz, or 60 kHz may be set for the mobile station 200 (for example, Fig. 9 (processing of ST101 shown).

[0202] In addition, the base station 100 can allocate the NR PDSCH to any time resource (for example, Fig. 9 (processing of ST102 shown).

[0203] In addition, for example, the base station 100 may allocate the PDSCH to the activated BWP (eg, Fig. 9 (processing of ST102 shown).

[0204] In addition, the base station 100 may configure the mobile station 200 to use MU-MIMO based on orthogonal DMRS ports (for example, Fig. 9 (processing of ST102 shown).

[0205] For example, based on Figure 2 The position of the DMRS in the PDSCH set according to the "Assumption 1" shown is assumed to be the "xth symbol".

[0206] The base station 100 determines, for example, whether to change (in other words, shift) the position of the DMRS to a symbol (hereinafter referred to as “y-th symbol”) different from the x-th symbol set for the mobile station 200 (for example, Fig. 9 For example, when the symbol in which the CRS is arranged overlaps with the x-th symbol set for the mobile station 200, the base station 100 may determine the position of the DMRS to be the y-th symbol different from the x-th symbol.

[0207] For example, the base station 100 can determine whether the symbol in which the CRS is configured overlaps with the x-th symbol in which the DMRS is configured based on information related to the LTE CRS (e.g., information related to the configuration of the CRS) and information related to the resources set for the mobile station 200 (e.g., information about the allocated resources in the frequency domain and time domain related to the PDSCH). In other words, the base station 100 determines whether the CRS and the DMRS will conflict in the x-th symbol. For example, when it is determined that the CRS and the DMRS will conflict, the base station 100 can determine that the condition for shifting the DMRS is "true".

[0208] When the condition for shifting the DMRS is "true" (ST103: Yes), the base station 100 determines (in other words, changes or shifts) the position of the DMRS to the yth symbol different from the xth symbol (ST104). For example, the base station 100 may also configure (in other words, shift) the DMRS to the yth symbol having a smaller symbol number among the symbols after the xth symbol that do not conflict with the CRS.

[0209] Furthermore, when there is no symbol that does not collide with the CRS in symbols after the x-th symbol, the base station 100 may configure the DMRS to the x-th symbol (in other words, not shift it).

[0210] In addition, the mobile station 200 determines whether to change to a position (y-th symbol) different from the position (x-th symbol) of the DMRS set based on the control signal notified by the base station 100 (for example, Fig. 9 For example, when the symbol in which the CRS is arranged overlaps with the x-th symbol set for the mobile station 200, the mobile station 200 may determine the position of the DMRS to be the y-th symbol different from the x-th symbol.

[0211] For example, similar to the base station 100, the mobile station 200 determines whether the symbol in which the CRS is configured and the x-th symbol in which the DMRS is configured overlap (in other words, collide) based on the information related to the LTE CRS and the allocation information of the PDSCH set for the mobile station 200. For example, when the mobile station 200 determines that the CRS and the DMRS will collide, it can determine that the condition for shifting the DMRS is "true".

[0212] When the condition for shifting the DMRS is "true" (ST107: Yes), the mobile station 200 determines that the position of the DMRS has been determined (in other words, changed or shifted) to the yth symbol different from the xth symbol (ST108). For example, the mobile station 200 may determine that the DMRS has been arranged (in other words, shifted) to the yth symbol having a smaller symbol number among the symbols after the xth symbol that do not collide with the CRS.

[0213] Furthermore, when there is no symbol that does not collide with the CRS in symbols after the x-th symbol, the mobile station 200 may determine that the DMRS has been allocated to the x-th symbol (in other words, may determine not to shift it).

[0214] According to action example 1-5, for example, when the DMRS in the NR PDSCH conflicts with the LTE CRS, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the DMRS in the NR PDSCH to another symbol that does not conflict with the CRS. By determining the DMRS position, the conflict between the DMRS in the NR PDSCH and the LTE CRS can be avoided.

[0215] Furthermore, the subcarrier spacing set for the mobile station 200 is not limited to 15 kHz, 30 kHz, and 60 kHz, and may be other spacings.

[0216] In addition, in action example 1-5, the yth symbol is not limited to the symbol with the smallest number among the symbols that do not conflict with the CRS among the symbols after the xth symbol, and may be, for example, the symbol with the second smallest number among the symbols that do not conflict with the CRS, or the symbol after the symbol with the third smallest number. Alternatively, the yth symbol may also be the symbol that does not conflict with the CRS before the xth symbol. By changing to these symbols, for example, the DMRS can be flexibly configured at a time position or interval suitable for improving the accuracy of channel estimation in the mobile station 200.

[0217] In addition, in addition to determining whether the DMRS and CRS will conflict, the base station 100 and the mobile station 200 may also determine whether to change the position of the DMRS that has been set for the mobile station 200, for example, based on whether the content indicated by the setting information of the mobile station 200 satisfies at least one of the above-mentioned conditions (1), condition (3), condition (5) and condition (8).

[0218] In addition, for example, the base station 100 and the mobile station 200 may determine that MU-MIMO based on orthogonal DMRS can be applied to the mobile station 200 when at least one of the above-mentioned conditions (1), condition (3), condition (5) and condition (8) is satisfied. For example, the base station 100 performs DMRS shift on each of the plurality of mobile stations 200 that use MU-MIMO based on orthogonal DMRS. In addition, each mobile station 200 that uses MU-MIMO based on orthogonal DMRS assumes that DMRS shift will be performed on other mobile stations 200 that are multiplexed with MU-MIMO to avoid a conflict between DMRS and CRS, and thus determines to perform DMRS shift on the mobile station 200 as well. Through this judgment, when MU-MIMO based on orthogonal DMRS is applied to the mobile station 200, the deterioration of the orthogonality of the DMRS ports corresponding to the plurality of mobile stations 200 can be reduced.

[0219] The above describes an operation example of DMRS configuration.

[0220] Thus, in the present embodiment, the base station 100 and the mobile station 200 determine the configuration of the DMRS in the NR PDSCH, for example, based on the information set for the mobile station 200 (in other words, the information that can determine the configuration of the LTE CRS). By determining the DMRS configuration, for example, the base station 100 using the DSS can appropriately configure the DMRS to avoid the conflict between the DMRS and the CRS. In addition, by determining the DMRS configuration, for example, the orthogonality of the DMRS ports can be maintained. In addition, even when the DSS is used, the mobile station 200 can appropriately determine the configuration of the DMRS and receive the NR PDSCH.

[0221] (Variation 1 of Implementation Method 1)

[0222] In Embodiment 1, when DMRSs are arranged in a plurality of symbols in a slot, the base station 100 and the mobile station 200 may simultaneously change (in other words, shift) the plurality of symbols in which DMRSs are arranged.

[0223] For example, in Figure 2 When the positions of the DMRS in the illustrated “Assumption 1” are the 8th symbol and the 11th symbol, the base station 100 and the mobile station 200 may change the positions of the respective DMRS to the 9th symbol and the 12th symbol.

[0224] By changing the DMRS configuration, conflicts between multiple DMRS and CRS can be avoided.

[0225] (Variation 2 of Implementation Example 1)

[0226] In Embodiment 1, for example, Fig. 9The information related to the LTE system (for example, RRC parameter RateMatchPatternLTE-CRS) notified by the base station 100 to the mobile station 200 in the process of ST101 shown may be information related to CRS in a component carrier (CC) of LTE operating in one of the following frequency bands.

[0227] (1) System frequency band of the NR component carrier on which the base station 100 and the mobile station 200 operate

[0228] (2) A certain BWP set for the mobile station 200

[0229] (3) Active BWP used for transmission to mobile station 200

[0230] (4) Allocated frequency band for PDSCH transmitted to mobile station 200

[0231] Furthermore, when there are a plurality of LTE component carriers in the above-mentioned frequency band, base station 100 may notify mobile station 200 of a parameter indicating information related to the CRS in one or more LTE component carriers.

[0232] For example, when multiple parameters are notified, the base station 100 and the mobile station 200 may determine whether to change the position of the DMRS based on one or more parameters (for example, Fig. 9 Processing of ST103 and ST107 shown).

[0233] In addition, the base station 100 and the mobile station 200 may also determine whether to change the position of the DMRS based on a part of the multiple parameters. For example, the base station 100 and the mobile station 200 may perform operations based on a parameter including a larger number of CRS ports among the multiple parameters, or may perform operations based on a parameter in which non-MBSFN subframes are set more frequently. Through these operations, for example, the position of the DMRS is determined by considering the situation in which the CRS can be configured in more resources, thereby reducing the possibility of conflict between the CRS and the DMRS.

[0234] Furthermore, the base station 100 may notify the mobile station 200 of the parameters used as a basis for determining whether to change the position of the DMRS.

[0235] (Variation 3 of Implementation Example 1)

[0236] In Embodiment 1, the condition for determining whether to change the position of the DMRS may be, for example, information known between base station 100 and mobile station 200, or information notified from base station 100 to mobile station 200 via a control signal such as a higher layer signal or DCI.

[0237] Alternatively, information indicating the result of determination as to whether to change the position of the DMRS may be notified from the base station 100 to the mobile station 200 via a control signal such as a higher layer signal or DCI.

[0238] Through this notification, the mobile station 200 can accurately determine whether the position of the DMRS transmitted by the base station 100 has changed.

[0239] (Variation 4 of Implementation Method 1)

[0240] In Embodiment 1, the mobile station 200 may implicitly notify, for example, that MU-MIMO based on orthogonal DMRS ports is used by DCI related to antenna port mapping notifying that "all remaining orthogonal antenna ports are not related to PDSCH transmission for other UEs".

[0241] (Variation 5 of Implementation Method 1)

[0242] In implementation mode 1, it is also possible to Fig.15 In this way, the position of the DMRS received by the mobile station 200 that does not apply MU-MIMO using orthogonal DMRS is shifted. This can alleviate the degradation of reception accuracy caused by collision of DMRSs between cells, for example.

[0243] (Variation 6 of Implementation Method 1)

[0244] In implementation mode 1, the parameters contained in the conditions of the above-mentioned action examples are not limited to RateMatchPatternLTE-CRS, and may be, for example, parameters associated with at least CRS or MBSFN subframes, that is, high-layer parameters with names different from RateMatchPatternLTE-CRS or parameters contained in control signals such as DCI, etc.

[0245] (Implementation Method 2)

[0246] For example, when multiple DMRS are configured in a time slot, as described in Implementation 1, by changing the position of the DMRS that will conflict with the CRS, the positional relationship (e.g., time interval) between the DMRS whose position has been changed and other DMRS (in other words, the DMRS whose position has not been changed) will change.

[0247] For example, the greater the time interval between DMRSs, the more the channel estimation accuracy between related DMRSs will deteriorate.

[0248] In addition, for example, the smaller the time interval between DMRSs, the smaller the effect of configuring DMRSs in multiple symbols. In other words, the smaller the time interval between DMRSs, the greater the overhead generated by DMRSs, and the lower the resource utilization efficiency.

[0249] In this embodiment, a DMRS arrangement method for suppressing degradation of channel estimation accuracy and a DMRS arrangement method for improving resource utilization efficiency are described.

[0250] Furthermore, the basic configurations of the base station and the mobile station of this embodiment are common to the base station 100 and the mobile station 200 of the first embodiment.

[0251] Next, operation examples of DMRS configuration according to this embodiment will be described.

[0252] <Action Example 2-1>

[0253] In Action Example 2-1, for example, when DMRS is arranged in multiple symbols in a time slot, the base station 100 and the mobile station 200 change the position of the DMRS that will collide with the CRS and also change the position of the DMRS that will not collide with the CRS (in other words, shift it).

[0254] As an example, the following situation is described, that is, if Fig.16 As shown in (a) of FIG. 2 , for the mobile station 200 , the NRPDSCH is allocated to 9 symbols from the 5th symbol to the 13th symbol within the BWP with a subcarrier spacing of 15 kHz.

[0255] In this case, for example, if based on Figure 2 In the "Assumption 1" shown, the position of the DMRS in the PDSCH is set to the 5th codeword, the 8th codeword and the 11th codeword (l=0, 3, 6).

[0256] In addition, for example, the base station 100 and the mobile station 200 determine that Figure 3 As shown, the CRS can be configured to at least the 7th codeword, the 8th codeword and the 11th codeword in the time slot.

[0257] In this case, the base station 100 and the mobile station 200 determine that the DMRS and the CRS will collide in the 8th symbol and the 11th symbol, for example.

[0258] Therefore, the base station 100 may change the positions of the DMRS that can be arranged in the 8th and 11th symbols, and the position of the DMRS that can be arranged in the 5th symbol (in other words, shift them). Fig.16 The DMRS of the 5th, 8th and 11th symbols shown in (a) are changed to Fig.16 The 6th, 9th and 12th codewords shown in (b).

[0259] In addition, similarly to the base station 100, the mobile station 200 may also determine that Fig.16The DMRSs of the 5th, 8th and 11th symbols shown in (a) have been respectively configured as follows: Fig.16 The 6th, 9th and 12th codewords shown in (b).

[0260] In operation example 2-1, when the position of at least one of the plurality of DMRSs in a time slot is changed, the base station 100 and the mobile station 200 change the positions of the remaining DMRSs based on the position of the DMRS (in other words, the change in position). Fig.16 (a) and Fig.16 As shown in (b) of FIG. 1 , the three DMRSs in the PDSCH are shifted from the positions set for the mobile station 200 (for example, the positions based on “Assumption 1”) to one symbol later. In other words, Fig.16 As shown in (b), the configuration interval between the DMRSs after the change (for example, 3 codewords) is the same as the configuration interval between the DMRSs before the change (for example, 3 codewords).

[0261] With this DMRS configuration, even when the position of the DMRS is changed, the configuration interval between the plurality of DMRSs in the time domain does not change, and thus it is possible to suppress degradation of channel estimation accuracy due to the DMRS.

[0262] <Action Example 2-2>

[0263] In Action Example 2-2, for example, when DMRS is configured in multiple codewords within a time slot, under the determined DMRS configuration (in other words, the changed position), for two DMRSs whose time interval is below the threshold, the base station 100 and the mobile station 200 decide not to send (in other words, discard) one of the two DMRSs.

[0264] As an example, the following situation is described, that is, if Fig.17 As shown in (a) of FIG. 2 , for the mobile station 200 , the NRPDSCH is allocated to 9 symbols from the 5th symbol to the 13th symbol within the BWP with a subcarrier spacing of 30 kHz.

[0265] Here, the threshold value related to the time interval between DMRSs for determining whether to discard the DMRS is set to 1 symbol. In addition, the threshold value is not limited to 1 symbol, and may be 2 symbols or more.

[0266] In this case, for example, if based on Figure 2 In the "Assumption 1" shown, the position of the DMRS in the PDSCH is set to the 5th codeword, the 8th codeword and the 11th codeword (l=0, 3, 6).

[0267] In addition, for example, the base station 100 and the mobile station 200 determine that the LTE CRS (eg, 15kHz SCS) can be arranged in at least the 8th symbol in the time slot. In this case, the base station 100 and the mobile station 200 determine that the DMRS and the CRS will collide in the 8th symbol.

[0268] Therefore, the base station 100 and the mobile station 200 determine (in other words, change or shift) the position of the DMRS to, for example, the 10th symbol which is different from the 8th symbol. In this case, the determined DMRS are arranged at the 5th symbol, the 10th symbol, and the 11th symbol.

[0269] Here, the interval between the DMRSs that can be configured in the 10th symbol and the 11th symbol is less than the threshold value (1 symbol), so, for example, Fig.17 As shown in (b), the base station 100 and the mobile station 200 may decide to discard the DMRS that can be allocated in the 10th symbol.

[0270] Therefore, if Fig.17 As shown in (b) of FIG. 1 , the base station 100 can transmit the DMRS in the 5th symbol and the 11th symbol, and the mobile station 200 can receive the DMRS in the 5th symbol and the 11th symbol.

[0271] In addition, for example, Fig.17 As shown in (b) of FIG. 1 , the base station 100 may transmit other signals (eg, PDSCH) in the 10th symbol in which the DMRS is discarded.

[0272] For example, Fig.17 As shown in (b), when DMRS is configured in the 11th symbol, the degree of channel estimation accuracy is substantially the same as when DMRS is configured in the 10th and 11th symbols. Fig.17 As shown in (b), DMRS is discarded in the 10th codeword, so the degradation of channel estimation accuracy can be suppressed, thereby suppressing the increase of overhead caused by DMRS. In addition, because other signals are configured in the 10th codeword in which DMRS is discarded, resource utilization efficiency can be improved.

[0273] In addition, Fig.17 (b) of FIG. 1 illustrates a case where the DMRS of the 10th symbol is discarded among the DMRSs of the 10th symbol and the 11th symbol that can be configured with an interval less than a threshold value. However, the DMRS to be discarded may also be the DMRS of the 11th symbol.

[0274] In the above, each embodiment of the present disclosure has been described.

[0275] (Other embodiments)

[0276] In the above-mentioned embodiments, downlink communication in which the base station is a transmitting device and the mobile station is a receiving device is assumed. However, an embodiment of the present disclosure is not limited thereto, and may also be applied to uplink communication in which the mobile station is a transmitting device and the base station is a receiving device, or communication between mobile stations, i.e., sidelink communication.

[0277] In addition, in the above-mentioned embodiments, the case where the number of structural codewords in a time slot is 14 codewords is described, but the number of structural codewords in a time slot is not limited to 14 codewords, and it can also be another number of codewords (for example, 12 codewords).

[0278] In addition, in each of the above embodiments, a case where the position (e.g., symbol) of DMRS is changed (in other words, shifted) is described. However, the signal whose position is changed is not limited to DMRS, but may be other signals. In addition, in each of the above embodiments, a case where the conflict between DMRS and CRS is avoided by determining the position of DMRS is described. However, the signal for which the conflict with DMRS is considered is not limited to CRS, but may be other signals different from CRS. For example, instead of at least one of DMRS and CRS, an embodiment of the present disclosure may also be applicable to reference signals, channels, or other signals in NR or LTE as described below.

[0279] Phase Tracking Reference Signal (PT-RS, PTRS)

[0280] Channel State Information Reference Signal (CSI-RS)

[0281] Sounding Reference Signal (SRS)

[0282] Tracking Reference Signal (TRS)

[0283] Discovery Reference Signal (Discovery Signal, DRS)

[0284] Primary Synchronization Signal (PSS)

[0285] Secondary Synchronization Signal (SSS)

[0286] Physical Downlink Control Channel (PDCCH)

[0287] Physical Downlink Shared Channel (PDSCH)

[0288] Uplink Control Channel (Physical Uplink Control Channel, PUCCH)

[0289] Physical Uplink Shared Channel (PUSCH)

[0290] Physical Broadcast Channel (PBCH)

[0291] Physical Control Format Indicator Channel (PCFICH)

[0292] HARQ Notification Channel (Physical HARQ Indicator Channel, Physical HARQ Notification Channel (PHICH))

[0293] Physical Multicast Channel (PMCH)

[0294] In addition, in the above-mentioned embodiments, the mapping method of PDSCH is not limited to PDSCH mapping type B. The mapping method of PDSCH may be, for example, PDSCH mapping type A, or other mapping methods. An embodiment of the present disclosure may be applicable to a situation where DMRS and CRS may conflict regardless of the mapping method of PDSCH.

[0295] In addition, in each of the above embodiments, when the position of the DMRS is changed (in other words, it is shifted), it can also be changed to another frequency position. For example, the DMRS belonging to a certain DMRS CDM group can also be changed to a frequency position corresponding to other DMRS CDM croups. In this way, it is possible to more flexibly avoid conflicts with the CRS.

[0296] In addition, in each of the above-mentioned embodiments, the "higher layer signal" is sometimes also referred to as an "RRC signal (RRC signaling)" or a "MAC signal (MAC signaling)", for example.

[0297] In the above-mentioned embodiments, the “reference signal” may also be referred to as a “reference signal” or a “pilot signal.” In addition, the DMRS may also be referred to as a “DM-RS.”

[0298] In addition, in each of the above-mentioned embodiments, the unit of time resources is not limited to the time slot and the codeword, and other time resource units such as a frame, a subframe, or a subslot may be used.

[0299] The present disclosure can be implemented by software, hardware or software in cooperation with hardware. Each functional block used in the description of the above-mentioned embodiment is partially or entirely implemented as an LSI (Large Scale Integration) as an integrated circuit, and each process described in the above-mentioned embodiment can also be partially or entirely controlled by an LSI or a combination of LSIs. LSI can be composed of individual chips, or it can be composed of a chip in a manner that includes part or all of the functional blocks. LSI can also include the input and output of data. LSI can also be called "IC (Integrated Circuit)", "System LSI (System LSI)", "Super LSI (Super LSI)", "Ultra LSI (Ultra LSI)" according to the different levels of integration. The method of integrated circuitization is not limited to LSI, and can also be implemented by a dedicated circuit, a general-purpose processor or a dedicated processor. In addition, it is also possible to use an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor (Reconfigurable Processor) that can reconfigure the connection or setting of the circuit block inside the LSI. The present disclosure can also be implemented as digital processing or analog processing. Furthermore, if integrated circuit technology that replaces LSI emerges as semiconductor technology advances or other technologies are derived, it is of course possible to use this technology to achieve integration of functional blocks. There is also the possibility of applying biotechnology, etc.

[0300] The present disclosure can be implemented in all kinds of devices, equipment, and systems (collectively referred to as "communication devices") with communication functions. The communication device may also include a wireless transceiver and a processing / control circuit. The wireless transceiver may also include a receiving unit and a transmitting unit, or perform the functions of these parts. The wireless transceiver (transmitting unit, receiving unit) may also include an RF (Radio Frequency) module and one or more antennas. The RF module may also include an amplifier, an RF modulator / demodulator, or a device similar to these. Non-limiting examples of communication devices include: phones (mobile phones, smart phones, etc.), tablet computers, personal computers (PCs) (laptops, desktops, notebook computers, etc.), cameras (digital cameras, digital video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smart watches, tracking devices, etc.), game consoles, e-book readers, telehealth / telemedicine (telehealth / medical prescription) equipment, vehicles with communication functions or transportation vehicles (cars, airplanes, ships, etc.), and combinations of the above-mentioned various devices.

[0301] Communication devices are not limited to portable or mobile devices, but also include all kinds of devices, equipment, and systems that cannot be carried or fixed. For example, they include: smart home devices (home appliances, lighting equipment, smart meters or meters, control panels, etc.), vending machines, and all other "things" that can exist on the IoT (Internet of Things) network.

[0302] The communication includes data communication performed by a cellular system, a wireless LAN (Local Area Network) system, a communication satellite system, etc., and also includes data communication performed by a combination of these systems.

[0303] In addition, the communication device also includes devices such as controllers or sensors connected or linked to the communication equipment that performs the communication functions described in the present disclosure. For example, it includes a controller or sensor that generates a control signal or data signal used by the communication equipment that performs the communication functions of the communication device.

[0304] In addition, the communication device includes infrastructure equipment that communicates with the above-mentioned non-limiting various devices or controls the above-mentioned various devices, such as base stations, access points, and all other devices, equipment, and systems.

[0305] A receiving device according to an embodiment of the present disclosure includes: a control circuit that determines a configuration of a second reference signal in a second system based on information that can determine a configuration of a first reference signal in a first system; and a receiving circuit that receives the second reference signal based on the determined configuration.

[0306] In one embodiment of the present disclosure, when the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be a symbol different from a symbol set for the receiving device.

[0307] In one embodiment of the present disclosure, the condition does not depend on whether a symbol configuring the first reference signal overlaps with a symbol of the second reference signal set for the receiving device.

[0308] In one embodiment of the present disclosure, when a first codeword configuring the first reference signal overlaps with a second codeword of the second reference signal set for the receiving device, the control circuit determines the position of the second reference signal to be a third codeword different from the second codeword based on the information.

[0309] In one embodiment of the present disclosure, the control circuit determines whether the first symbol overlaps with the second symbol based on allocation information of data including the second reference signal and information related to configuration of the first reference signal.

[0310] In one embodiment of the present disclosure, when the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be the third codeword.

[0311] In one embodiment of the present disclosure, the condition does not depend on whether the first codeword overlaps with the second codeword.

[0312] In one embodiment of the present disclosure, when the position of at least one reference signal among the plurality of second reference signals is changed, the control circuit changes the positions of the remaining reference signals based on the position of the at least one reference signal.

[0313] In one embodiment of the present disclosure, for two second reference signals whose time interval is less than a threshold in the determined configuration, the control circuit decides not to send one of the two second reference signals.

[0314] A transmitting device according to an embodiment of the present disclosure includes: a control circuit that determines a configuration of a second reference signal in a second system based on information that can determine a configuration of a first reference signal in a first system; and a transmitting circuit that transmits the second reference signal in the determined configuration.

[0315] In a receiving method of an embodiment of the present disclosure, a receiving device performs the following steps: determining a configuration of a second reference signal in a second system based on information that can determine a configuration of a first reference signal in a first system; and receiving the second reference signal based on the determined configuration.

[0316] In a sending method of an embodiment of the present disclosure, a sending device performs the following steps: based on information that can determine the configuration of a first reference signal in a first system, determining the configuration of a second reference signal in a second system; and sending the second reference signal with the determined configuration.

[0317] The disclosure contents of the specification, drawings, and abstract contained in Japanese patent application No. 2019-149144 filed on August 15, 2019 are incorporated herein by reference in their entirety.

[0318] Industrial Applicability

[0319] One embodiment of the present disclosure is useful for a mobile communication system.

[0320] Description of Reference Numerals

[0321] 100 Base Stations

[0322] 101, 206 Control Department

[0323] 102 Coding / Modulation Unit

[0324] 103 Signal Configuration Department

[0325] 104 Sending Department

[0326] 105, 201 Antenna

[0327] 200 Mobile Station

[0328] 202 Receiving Department

[0329] 203 Signal separation unit

[0330] 204 Channel Estimation Unit

[0331] 205 Demodulation / decoding unit.

Claims

1. A receiving device, characterized in that: include: a control circuit that determines a configuration of a second reference signal in the second system based on information that can determine a configuration of the first reference signal in the first system; as well as a receiving circuit, receiving the second reference signal based on the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the control circuit changes the positions of the remaining reference signals based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

2. The receiving device according to claim 1, wherein When the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be a symbol different from a symbol set for the receiving apparatus.

3. The receiving device according to claim 2, wherein: The condition does not depend on whether the symbol configuring the first reference signal overlaps with the symbol of the second reference signal set for the receiving apparatus.

4. The receiving device according to claim 1, wherein When a first symbol in which the first reference signal is arranged overlaps with a second symbol of the second reference signal configured for the receiving apparatus, the control circuit determines a position of the second reference signal to be a third symbol different from the second symbol.

5. The receiving device according to claim 4, wherein The control circuit determines whether the first symbol and the second symbol overlap based on allocation information including data of the second reference signal and information related to the arrangement of the first reference signal. The receiving device according to claim 4 , wherein: When the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be the third symbol.

7. The receiving device according to claim 6, wherein: The condition does not depend on whether the first codeword and the second codeword overlap.

8. The receiving device according to claim 1, wherein For two second reference signals whose time interval is less than a threshold in the determined configuration, the control circuit decides not to send one of the two second reference signals.

9. The receiving device according to claim 4, wherein: When the subcarrier spacing set for the receiving apparatus is a specific value, the control circuit determines the position of the second reference signal to be a symbol different from the symbol set for the receiving apparatus.

10. The receiving device according to claim 4, wherein: When the subcarrier spacing set for the receiving apparatus is 15 kHz, the control circuit determines the position of the second reference signal to be a symbol different from the symbol set for the receiving apparatus.

11. The receiving device according to claim 4, wherein: When a physical downlink shared channel resource is notified by physical downlink shared channel mapping type B and the physical downlink shared channel resource has a specific length, the control circuit determines the position of the second reference signal to be a codeword different from the codeword set for the receiving device.

12. A sending device, characterized in that: include: a control circuit that determines a configuration of a second reference signal in the second system based on information that can determine a configuration of the first reference signal in the first system; as well as a transmitting circuit configured to transmit the second reference signal in the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the control circuit changes the positions of the remaining reference signals based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

13. The transmitting device according to claim 12, wherein: When the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be a symbol different from a symbol set for the receiving device.

14. The transmitting device according to claim 13, wherein: The condition does not depend on whether the symbol configuring the first reference signal overlaps with the symbol of the second reference signal set for the receiving apparatus.

15. The transmitting device according to claim 12, wherein: When a first symbol in which the first reference signal is arranged overlaps with a second symbol of the second reference signal set for the receiving apparatus, the control circuit determines the position of the second reference signal to be a third symbol different from the second symbol.

16. The transmitting device according to claim 15, wherein: The control circuit determines whether the first symbol and the second symbol overlap based on allocation information including data of the second reference signal and information related to the arrangement of the first reference signal.

17. The transmitting device according to claim 15, wherein: When the content indicated by the information satisfies a certain condition, the control circuit determines the position of the second reference signal to be the third symbol.

18. The transmitting device according to claim 17, wherein: The condition does not depend on whether the first codeword and the second codeword overlap.

19. The transmitting device according to claim 12, wherein: For two second reference signals whose time interval is less than a threshold in the determined configuration, the control circuit decides not to send one of the two second reference signals.

20. The transmitting device according to claim 15, wherein When the subcarrier spacing set for the receiving apparatus is a specific value, the control circuit determines the position of the second reference signal to be a symbol different from the symbol set for the receiving apparatus.

21. The transmitting device according to claim 15, wherein: When the subcarrier spacing set for the receiving apparatus is 15 kHz, the control circuit determines the position of the second reference signal to be a symbol different from the symbol set for the receiving apparatus.

22. The transmitting device according to claim 15, wherein: When a physical downlink shared channel resource is notified by physical downlink shared channel mapping type B and the physical downlink shared channel resource has a specific length, the control circuit determines the position of the second reference signal to be a codeword different from the codeword set for the receiving device.

23. A receiving method, characterized in that: The receiving device performs the following steps: determining a configuration of a second reference signal in the second system based on information determining a configuration of the first reference signal in the first system; as well as receiving the second reference signal based on the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the positions of the remaining reference signals are changed based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

24. A sending method, characterized in that: The sending device performs the following steps: determining a configuration of a second reference signal in the second system based on information determining a configuration of the first reference signal in the first system; and sending the second reference signal in the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the positions of the remaining reference signals are changed based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

25. An integrated circuit for a receiving device, characterized in that: include: a decision circuit that determines a configuration of a second reference signal in the second system based on information that can determine a configuration of a first reference signal in the first system; as well as a receiving circuit, receiving the second reference signal based on the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the decision circuit changes the positions of the remaining reference signals based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

26. An integrated circuit for a transmitting device, characterized in that: include: a decision circuit that determines a configuration of a second reference signal in the second system based on information that can determine a configuration of a first reference signal in the first system; as well as a transmitting circuit configured to transmit the second reference signal in the determined configuration, The first reference signal is a cell-specific reference signal (CRS), the first system is an LTE system, the second reference signal is a demodulation reference signal (DMRS), and the second system is a new radio access technology (NR) system. When the position of at least one of the plurality of second reference signals is changed, the decision circuit changes the positions of the remaining reference signals based on the position of the at least one reference signal. The location of the at least one reference signal is a symbol where the second reference signal collides with the first reference signal.

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