JP2013021416A - Mobile communication system, base station device, mobile station device and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide mobile communication system, base station device, mobile station device and communication method, capable of demodulation without deteriorating transmitted information quality by transmitting an uplink demodulation reference signal using a sequence having high orthogonality.SOLUTION: In a mobile communication system in which a base station device communicates with a mobile station device, the base station device transmits, to the mobile station device, resource allocation information to a physical uplink common channel. When the interval of subcarriers to which the uplink demodulation reference signal is allocated is 2 or greater, the mobile station device determines whether the uplink demodulation reference signal is to be allocated with the subcarrier interval of 2 or greater or the uplink demodulation reference signal is to be allocated to consecutive subcarriers, based on the subcarrier interval of 2 or greater and the resource allocation information.

Description

  The present invention relates to a mobile communication system, a base station apparatus, a mobile station apparatus, and a communication method.

  Evolution of cellular mobile radio access schemes and radio networks (hereinafter LTE: Long Term Evolution or EUTRA: Evolved Universal Terrestrial Radio Access) It is being considered. In LTE, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used as a downlink communication scheme from a base station apparatus to a mobile station apparatus. Further, as an uplink communication system from the mobile station apparatus to the base station apparatus, an SC-FDMA (Single-Carrier Frequency Division Multiple Access) system excellent in PAPR (Peak to Average Power Ratio) characteristics is used. Here, in LTE, a base station apparatus is also called eNodeB (evolved NodeB) and a mobile station apparatus is also called UE (User Equipment).

  In LTE Release 11, spatial multiplexing by MIMO (Multiple Input Multiple Output) can be used in the uplink, and in particular, a plurality of mobile station apparatuses perform multiplex multiplexing using the same frequency and time resources. Supporting MIMO (Multi-User MIMO) has been studied. In addition, as a method for reducing and suppressing interference with mobile station apparatuses, it is considered to support coordinated multipoint transmission / reception (CoMP) that performs interference coordination in cooperation between base station apparatuses. Has been.

  Here, when performing communication using MU-MIMO or CoMP, in order to avoid deterioration in the quality of transmitted / received information, each antenna port (for each physical antenna or two or more physical antennas) in transmission / reception is used. It is desirable to be able to estimate with high accuracy the channel (also referred to as propagation path) defined by synthesis. In this regard, for example, in Non-Patent Document 1, IFDM (Interleaved Frequency Domain Multiplexing) in which uplink demodulation reference signals (UL DMRS: Uplink Demodulation Reference Signal, hereinafter also referred to as DMRS) are arranged in a comb shape on the frequency axis. It has been proposed to use (also called IFDMA).

  That is, it is considered that DMRSs are distributed in a comb shape in the frequency resource (frequency spectrum) direction (comb spectrum configuration), thereby increasing orthogonal resources used for DMRS transmission and improving the channel estimation system.

"UL RS Enhancement for LTE-Advanced", 3GPP TSG RAN WG1 Meeting # 57bis, R1-092801, June 29-July 3, 2009.

  However, the conventional technique has a problem in that when transmitting DMRS using IFDM, the DMRS may be transmitted using a sequence with low orthogonality. That is, there is a problem in that the quality of information demodulated using the DMRS may be deteriorated by transmitting the DMRS using a sequence that is not highly orthogonal.

  The present invention has been made in view of such circumstances, and mobile communication that can be demodulated without degrading the quality of transmitted information by transmitting DMRS using a highly orthogonal sequence. A system, a base station apparatus, a mobile station apparatus, and a communication method are provided.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the mobile communication system of the present invention is a mobile communication system in which a base station apparatus and a mobile station apparatus communicate with each other, and the base station apparatus transmits resource allocation information for a physical uplink shared channel to the mobile station apparatus. When the subcarrier interval in which the uplink demodulation reference signal is arranged is 2 or more, the mobile station apparatus refers to the uplink demodulation reference based on the interval of the two or more subcarriers and the resource allocation information. It is characterized in that it is determined whether a signal is arranged at intervals of the two or more subcarriers or whether the uplink demodulation reference signal is arranged in continuous subcarriers.

  (2) The mobile station apparatus refers to the uplink demodulation when the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size. A signal is arranged on the continuous subcarriers.

  (3) In addition, when the mobile station apparatus has an interval of the subcarriers of 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size The uplink demodulation reference signal is arranged on the continuous subcarriers.

  (4) A mobile communication system in which a base station apparatus and a mobile station apparatus communicate with each other, wherein the base station apparatus transmits resource allocation information for a physical uplink shared channel and an uplink demodulation reference signal to two or more sub-channels. Instruction information indicating whether or not to be arranged at carrier intervals is included in the downlink control information format and transmitted to the mobile station device, and the mobile station device has subcarrier intervals at which the uplink demodulation reference signals are arranged. In the case of two or more, based on the interval of the two or more subcarriers and the resource allocation information and the indication information, the uplink demodulation reference signal is arranged at the interval of the two or more subcarriers, or the uplink It is characterized by deciding whether to allocate link demodulation reference signals to consecutive subcarriers.

  (5) Further, the mobile station apparatus has an interval of the subcarriers of 2 or more, and the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and When the indication information indicates that the uplink demodulation reference signal is arranged at an interval of the two or more subcarriers, the uplink demodulation reference signal is arranged at an interval of the two or more subcarriers, When the resource allocation information indicates a predetermined first resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, An uplink demodulation reference signal is arranged on the continuous subcarriers.

  (6) In the mobile station apparatus, the subcarrier interval is 2 or more, the resource allocation information indicates a resource block size greater than or equal to a predetermined second resource block size, and the indication information Indicates that the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers, the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers, and the resource allocation When the information indicates a resource block size smaller than a predetermined second resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers Is characterized in that the uplink demodulation reference signal is arranged in the continuous subcarriers.

  (7) Moreover, the information which shows the space | interval of the subcarrier by which the said uplink demodulation reference signal is arrange | positioned is notified to the said mobile station apparatus by the said base station apparatus, It is characterized by the above-mentioned.

  (8) Further, the first resource block size, the second resource block size, and the third resource block size are characterized by being expressed by subcarriers.

  (9) A base station apparatus that communicates with a mobile station apparatus, a unit that transmits resource allocation information for a physical uplink shared channel to the mobile station apparatus, and a subcarrier in which an uplink demodulation reference signal is arranged When the interval is 2 or more, the uplink demodulation reference signals arranged at the interval of the two or more subcarriers are transmitted from the mobile station apparatus based on the interval of the two or more subcarriers and the resource allocation information. And a unit for determining whether to receive from the mobile station apparatus, the uplink demodulation reference signal arranged in a continuous subcarrier.

  (10) In addition, when the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size, the uplink arranged in the continuous subcarriers A unit for receiving a link demodulation reference signal from the mobile station apparatus is provided.

  (11) Further, when the interval between the subcarriers is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, the consecutive subcarriers A unit for receiving the uplink demodulation reference signal arranged in the mobile station apparatus from the mobile station apparatus.

  (12) A base station apparatus that communicates with a mobile station apparatus, and indicates whether to allocate resource allocation information for a physical uplink shared channel and an uplink demodulation reference signal at intervals of two or more subcarriers When the interval between the unit that includes the instruction information in the downlink control information format and transmits it to the mobile station apparatus and the subcarrier in which the uplink demodulation reference signal is arranged is two or more, the two or more subcarriers Based on the interval, the resource allocation information, and the instruction information, the uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus or arranged on consecutive subcarriers A unit for determining whether to receive the uplink demodulation reference signal from the mobile station device, It is a symptom.

  (13) The subcarrier interval is 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information is the uplink information When it indicates that the link demodulation reference signals are arranged at intervals of the two or more subcarriers, the uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus. And the resource allocation information indicates a predetermined first resource block size, or the indication information indicates that the uplink demodulation reference signal is not arranged at intervals of the two or more subcarriers Includes a unit that receives the uplink demodulation reference signal arranged in the continuous subcarriers from the mobile station apparatus. It is characterized in that it comprises.

  (14) The subcarrier interval is 2 or more, the resource allocation information indicates a resource block size equal to or larger than a predetermined second resource block size, and the indication information is the uplink demodulation reference In the case where it is indicated that signals are arranged at intervals of the two or more subcarriers, a unit that receives the uplink demodulation reference signals arranged at intervals of the two or more subcarriers from the mobile station device; The resource allocation information indicates a resource block size smaller than a predetermined second resource block size, or the indication information indicates that the uplink demodulation reference signal is not arranged at intervals of the two or more subcarriers The uplink demodulation reference signal arranged in the consecutive subcarriers is transferred. A unit for receiving from the station apparatus is characterized in that it comprises.

  (15) Further, the mobile station apparatus is notified of information indicating a subcarrier interval in which the uplink demodulation reference signal is arranged.

  (16) A mobile station apparatus that communicates with a base station apparatus, a unit that receives resource allocation information for a physical uplink shared channel from the base station apparatus, and a subcarrier in which an uplink demodulation reference signal is arranged When the interval is two or more, the uplink demodulation reference signal is arranged at the interval of the two or more subcarriers based on the interval of the two or more subcarriers and the resource allocation information, or the uplink demodulation And a unit for determining whether to arrange the reference signal on consecutive subcarriers.

  (17) When the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size, the uplink demodulation reference signal is transmitted as the consecutive subcarriers. It is characterized by including a unit to be arranged on the carrier.

  (18) When the subcarrier interval is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, the uplink demodulation reference A unit for arranging a signal on the continuous subcarrier is provided.

  (19) A mobile station apparatus that communicates with a base station apparatus, and indicates whether to allocate resource allocation information for a physical uplink shared channel and an uplink demodulation reference signal at intervals of two or more subcarriers When the interval between the unit that receives the instruction information in the downlink control information format and receives from the base station apparatus and the subcarrier in which the uplink demodulation reference signal is arranged is two or more, the two or more subcarriers Whether the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers or the uplink demodulation reference signals are arranged on consecutive subcarriers based on the interval, the resource allocation information, and the indication information And a unit for determining.

  (20) The subcarrier interval is 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information is the uplink information In a case where it is indicated that a link demodulation reference signal is arranged at an interval of the two or more subcarriers, a unit that arranges the uplink demodulation reference signal at an interval of the two or more subcarriers, and the resource allocation information Indicates a predetermined first resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, the uplink demodulation reference And a unit for arranging signals on the continuous subcarriers.

  (21) The subcarrier interval is 2 or more, the resource allocation information indicates a resource block size equal to or larger than a predetermined second resource block size, and the indication information is the uplink demodulation reference In the case where it is indicated that signals are arranged at intervals of the two or more subcarriers, a unit that arranges the uplink demodulation reference signal at intervals of the two or more subcarriers, and the resource allocation information is predetermined. When the resource block size is smaller than the second resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, the uplink A unit for arranging a link demodulation reference signal on the continuous subcarriers, That.

  (22) Further, the base station apparatus is notified of information indicating an interval between subcarriers in which the uplink demodulation reference signal is arranged.

  (23) Also, a communication method of a base station apparatus that communicates with a mobile station apparatus, wherein resource allocation information for a physical uplink shared channel is transmitted to the mobile station apparatus, and an uplink demodulation reference signal is arranged Is equal to or greater than 2, the mobile station apparatus transmits the uplink demodulation reference signals arranged at the intervals of the two or more subcarriers based on the interval of the two or more subcarriers and the resource allocation information. Or the uplink demodulated reference signal arranged in consecutive subcarriers is determined.

  (24) Further, in the communication method of the base station apparatus that communicates with the mobile station apparatus, whether the resource allocation information for the physical uplink shared channel and the uplink demodulation reference signal are arranged at intervals of two or more subcarriers Indication information indicating whether or not is included in a downlink control information format and transmitted to the mobile station apparatus, and when the interval of subcarriers in which the uplink demodulation reference signal is arranged is 2 or more, the two or more subcarriers And receiving the uplink demodulated reference signals arranged at intervals of the two or more subcarriers from the mobile station apparatus based on the resource allocation information and the resource allocation information and the instruction information, or arranged on consecutive subcarriers In addition, it is determined whether to receive the uplink demodulation reference signal from the mobile station apparatus.

  (25) A communication method of a mobile station apparatus that communicates with a base station apparatus, wherein resource allocation information for a physical uplink shared channel is received from the base station apparatus, and an uplink demodulation reference signal is arranged The uplink demodulation reference signal is arranged at the interval of the two or more subcarriers based on the interval of the two or more subcarriers and the resource allocation information, or the uplink It is characterized by determining whether to arrange the demodulated reference signal on continuous subcarriers.

  (26) In addition, in the communication method of the mobile station apparatus that communicates with the base station apparatus, whether the resource allocation information for the physical uplink shared channel and the uplink demodulation reference signal are arranged at intervals of two or more subcarriers Indication information indicating whether or not is included in a downlink control information format and received from the base station apparatus, and when the interval of subcarriers in which the uplink demodulation reference signal is arranged is two or more, the two or more subcarriers Whether the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers or the uplink demodulation reference signals are arranged on consecutive subcarriers based on the interval of the resource, the resource allocation information, and the indication information It is characterized by determining.

  Provided are a mobile communication system, a base station apparatus, a mobile station apparatus, and a communication method capable of demodulating without degrading the quality of transmitted information by transmitting DMRS using a sequence with high orthogonality.

It is a figure which shows notionally the structure of the physical channel which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the base station apparatus which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the mobile station apparatus which concerns on embodiment of this invention. It is a figure which shows the transmission method of DMRS. It is a figure which shows the transmission method of DMRS using IFDM. It is a figure which shows the example of the table used for the production | generation of a base sequence. It is another figure which shows the example of the table used for the production | generation of a base sequence. It is a figure which shows the example of transmission control of DMRS. It is another figure which shows the example of transmission control of DMRS. It is another figure which shows the example of transmission control of DMRS.

  Next, embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a physical channel and a reference signal in the embodiment of the present invention. Here, the physical channel is defined (configured) by a time domain and a frequency domain.

  As shown in FIG. 1, downlink physical channels include a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), and the like. The uplink physical channel includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and the like.

  In addition, the base station apparatus transmits a downlink reference signal (also referred to as DLRS: Downlink Reference Signal, downlink pilot signal, or downlink pilot channel) to the mobile station apparatus. In addition, the mobile station apparatus transmits an uplink reference signal (ULRS: Uplink Reference Signal, also called an uplink pilot signal or an uplink pilot channel) to the base station apparatus.

  Here, the uplink reference signal mainly includes an uplink demodulation reference signal (UL DMRS) used by the base station apparatus to demodulate the PUCCH or PUSCH. Further, the uplink reference signal includes a sounding reference signal (SRS) used mainly by the base station apparatus to estimate the uplink channel state.

  The PDCCH is downlink control information (DCI: downlink scheduling information (also referred to as downlink assignment)) and uplink scheduling information (also referred to as uplink grant). It is a physical channel used to transmit (notify, specify) Downlink Control Information. A plurality of formats are defined for transmission of downlink control information. Here, the format of the downlink control information is also referred to as a DCI format (Downlink Control Information format).

  For example, DCI format 1 is used for scheduling of PDSCH (one PDSCH codeword (CW)) in one cell. Also, for example, DCI format 2 is used for PDSCH scheduling in one cell in the multi-antenna port mode. That is, DCI format 1 and DCI format 2 are downlink assignments used for PDSCH scheduling.

  For example, information such as resource allocation information (Resource block assignment) for PDSCH, information on modulation scheme and coding rate (MCS: Modulation and Coding Scheme) for PDSCH, and the like is transmitted using downlink assignment.

  Also, for example, DCI format 0 is used for PUSCH scheduling in one cell (in single antenna port transmission mode). Also, for example, DCI format 4 is used for PUSCH scheduling in one cell in the multi-antenna port mode. That is, DCI format 0 and DCI format 4 are uplink grants used for PUSCH scheduling.

  For example, using an uplink grant, PUSCH resource allocation information (Resource block assignment), information on modulation scheme and coding rate (MCS: Modulation and Coding Scheme) for PUSCH, cyclic shift and orthogonal cover for DMRS Information such as information indicating the code (Cyclic shift for DMRS and OCC) is transmitted.

  The PDSCH is a channel used for transmitting downlink data (transport block for a downlink shared channel (DL-SCH)) or paging information (paging channel, PCH: Paging Channel). . The base station apparatus transmits downlink data to the mobile station apparatus using the PDSCH assigned by the PDCCH.

  Here, the downlink data indicates, for example, user data, and DL-SCH is a transport channel. A unit for transmitting downlink data by PDSCH is referred to as a downlink transport block (TB). Here, the downlink transport block is a unit handled in a MAC (Medium Access Control) layer. Also, the downlink transport block is associated with a codeword in the physical layer.

  Furthermore, PUSCH is a physical channel used for transmitting uplink data (transport block for uplink shared channel (UL-SCH)). A mobile station apparatus transmits uplink data to a base station apparatus using PUSCH allocated by PDCCH transmitted from the base station apparatus.

  Here, the uplink data indicates, for example, user data, and UL-SCH is a transport channel. A unit for transmitting uplink data by PUSCH is called an uplink transport block. Here, the uplink transport block is a unit handled in the MAC layer. Further, the uplink transport block is associated with a codeword in the physical layer.

  Further, the base station device and the mobile station device exchange (transmit / receive) signals in the higher layer. For example, the base station device and the mobile station device transmit and receive a radio resource control signal (hereinafter also referred to as RRC signaling: Radio Resource Control Signaling) in a radio resource control (RRC) layer.

  Here, in the RRC layer, a dedicated signal (a dedicated signal for a certain mobile station apparatus) transmitted to a certain mobile station apparatus by the base station apparatus is also referred to as dedicated signaling.

  Further, the base station device and the mobile station device transmit and receive MAC control elements in a MAC (Medium Access Control) layer. Here, the RRC signaling and / or MAC control element is also referred to as higher layer signaling.

Moreover, PUCCH is a physical channel used in order to transmit uplink control information (UCI: Uplink Control Information). Here, the uplink control information includes channel state information (CSI) indicating the channel state of the downlink. Further, the uplink control information includes control information in HARQ (Hybrid Automatic Repeat Request). Here, the control information in HARQ includes information indicating ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) for downlink data. Also, the uplink control information includes a scheduling request (SR) used for requesting allocation of resources for the mobile station apparatus to transmit uplink data.
[Configuration of base station apparatus]
FIG. 2 is a block diagram showing a schematic configuration of the base station apparatus 100 according to the embodiment of the present invention. The base station apparatus 100 includes a data control unit 101, a transmission data modulation unit 102, a radio unit 103, a scheduling unit 104, a channel estimation unit 105, a received data demodulation unit 106, a data extraction unit 107, and an upper layer. 108 and an antenna 109. The radio unit 103, the scheduling unit 104, the channel estimation unit 105, the reception data demodulation unit 106, the data extraction unit 107, the upper layer 108 and the antenna 109 constitute a reception unit, and the data control unit 101, the transmission data modulation unit 102, The radio unit 103, the scheduling unit 104, the upper layer 108, and the antenna 109 constitute a transmission unit. Here, each part which comprises the base station apparatus 100 is also called a unit.

  The antenna 109, the radio unit 103, the channel estimation unit 105, the reception data demodulation unit 106, and the data extraction unit 107 perform processing on the uplink physical layer. The antenna 109, the radio unit 103, the transmission data modulation unit 102, and the data control unit 101 perform downlink physical layer processing.

  The data control unit 101 receives a transport channel from the scheduling unit 104. The data control unit 101 maps the transport channel and the signal and channel generated in the physical layer to the physical channel based on the scheduling information input from the scheduling unit 104. Each piece of data mapped as described above is output to transmission data modulation section 102.

  The transmission data modulation unit 102 modulates transmission data to the OFDM scheme. The transmission data modulation unit 102 applies the scheduling information from the scheduling unit 104 to the data input from the data control unit 101 and the modulation scheme and coding scheme corresponding to each physical resource block (PRB). Based on this, it performs signal processing such as coding, serial / parallel conversion of input signals, IFFT (Inverse Fast Fourier Transform) processing, CP (Cyclic Prefix) insertion, and filtering to generate transmission data. To the wireless unit 103.

  Here, the scheduling information includes PRB allocation information, for example, PRB position information composed of frequency and time, and the modulation scheme and coding scheme corresponding to each PRB include, for example, modulation scheme: 16QAM, Encoding rate: Information such as 2/3 coding rate is included.

  Radio section 103 up-converts the modulation data input from transmission data modulation section 102 to a radio frequency to generate a radio signal, and transmits the radio signal to mobile station apparatus 200 via antenna 109. Radio section 103 receives an uplink radio signal from mobile station apparatus 200 via antenna 109, down-converts it into a baseband signal, and receives received data as channel estimation section 105 and received data demodulation section 106. And output.

  The scheduling unit 104 performs MAC layer processing. The scheduling unit 104 performs mapping between logical channels and transport channels, downlink and uplink scheduling (HARQ processing, selection of transport format, etc.), and the like. Since the scheduling unit 104 controls the processing units of each physical layer in an integrated manner, the scheduling unit 104, the antenna 109, the radio unit 103, the channel estimation unit 105, the reception data demodulation unit 106, the data control unit 101, the transmission data modulation An interface between the unit 102 and the data extraction unit 107 exists.

  In downlink scheduling, the scheduling unit 104 performs uplink control information received from the mobile station apparatus 200, PRB information usable in each mobile station apparatus 200, buffer status, and scheduling input from the upper layer 108. Based on information, etc., it is used for downlink transport format (transmission form, ie, PRB allocation, modulation scheme and coding scheme) selection processing for modulation of each data, HARQ retransmission control and downlink Scheduling information is generated. The scheduling information used for downlink scheduling is output to the data control unit 101.

  Further, in uplink scheduling, the scheduling unit 104 estimates the uplink channel state (radio channel state) output from the channel estimation unit 105, the resource allocation request from the mobile station device 200, and each mobile station device 200. Uplink transport format for modulating each data based on the PRB information that can be used in the network, scheduling information input from the higher layer 108, etc. (transmission form, ie, PRB allocation, modulation scheme and encoding) The scheduling information used for the selection process of the method and the scheduling of the uplink is generated. Scheduling information used for uplink scheduling is output to the data control unit 101.

  In addition, the scheduling unit 104 maps the downlink logical channel input from the higher layer 108 to the transport channel, and outputs it to the data control unit 101. In addition, the scheduling unit 104 processes the control data and the transport channel acquired in the uplink input from the data extraction unit 107 as necessary, maps them to the uplink logical channel, and outputs them to the upper layer 108. To do.

  Channel estimation section 105 estimates an uplink channel state from an uplink demodulation reference signal (UDRS) for demodulation of uplink data, and outputs the estimation result to reception data demodulation section 106. To do. In addition, in order to perform uplink scheduling, an uplink channel state is estimated from an uplink measurement reference signal (SRS), and the estimation result is output to the scheduling section 104.

  The reception data demodulator 106 also serves as an OFDM demodulator and / or a DFT-Spread-OFDM (DFT-S-OFDM) demodulator that demodulates received data modulated by the OFDM scheme and / or SC-FDMA scheme. Based on the uplink channel state estimation result input from the channel estimation unit 105, the reception data demodulation unit 106 performs DFT conversion, subcarrier mapping, IFFT conversion, filtering, and the like on the modulation data input from the radio unit 103. Are subjected to demodulation processing and output to the data extraction unit 107.

  The data extraction unit 107 confirms whether the data input from the reception data demodulation unit 106 is correct and outputs a confirmation result (ACK or NACK) to the scheduling unit 104. The data extraction unit 107 separates the data input from the reception data demodulation unit 106 into a transport channel and physical layer control data, and outputs the data to the scheduling unit 104. The separated control data includes CSI and HARQ control information transmitted from the mobile station apparatus 200, a scheduling request, and the like.

  The upper layer 108 performs processing of a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. The upper layer 108 integrates and controls the processing units of the lower layer, so the upper layer 108, the scheduling unit 104, the antenna 109, the radio unit 103, the channel estimation unit 105, the received data demodulation unit 106, the data control unit 101, There is an interface between the transmission data modulation unit 102 and the data extraction unit 107.

  The upper layer 108 has a radio resource control unit 110 (also referred to as a control unit). The radio resource control unit 110 also manages various setting information, system information, paging control, communication state management of each mobile station device 200, mobility management such as handover, and buffer status for each mobile station device 200. Management, management of unicast and multicast bearer connection settings, management of mobile station identifiers (UEID), and the like. Upper layer 108 exchanges information with another base station apparatus 100 and information with an upper node.

[Configuration of mobile station device]
FIG. 3 is a block diagram showing a schematic configuration of the mobile station apparatus 200 according to the embodiment of the present invention. The mobile station apparatus 200 includes a data control unit 201, a transmission data modulation unit 202, a radio unit 203, a scheduling unit 204, a channel estimation unit 205, a reception data demodulation unit 206, a data extraction unit 207, and an upper layer. 208 and an antenna 209. The data control unit 201, transmission data modulation unit 202, radio unit 203, scheduling unit 204, higher layer 208, and antenna 209 constitute a transmission unit, and the radio unit 203, scheduling unit 204, channel estimation unit 205, received data demodulation unit Unit 206, data extraction unit 207, upper layer 208, and antenna 209 constitute a reception unit. Here, each part which comprises the mobile station apparatus 200 is also called a unit.

  The data control unit 201, the transmission data modulation unit 202, and the radio unit 203 perform processing on the uplink physical layer. The radio unit 203, the channel estimation unit 205, the received data demodulation unit 206, and the data extraction unit 207 perform downlink physical layer processing.

  The data control unit 201 receives a transport channel from the scheduling unit 204. The transport channel and the signal and channel generated in the physical layer are mapped to the physical channel based on the scheduling information input from the scheduling unit 204. Each piece of data mapped in this way is output to transmission data modulation section 202.

  The transmission data modulation unit 202 modulates transmission data into the OFDM scheme and / or the SC-FDMA scheme. The transmission data modulation unit 202 performs data modulation, DFT (Discrete Fourier Transform) processing, subcarrier mapping, IFFT (Inverse Fast Fourier Transform) processing, CP insertion, filtering, and other signals on the data input from the data control unit 201. Processing is performed, transmission data is generated, and output to the wireless unit 203.

  Radio section 203 up-converts the modulation data input from transmission data modulation section 202 to a radio frequency, generates a radio signal, and transmits the radio signal to base station apparatus 100 via antenna 209. Radio section 203 receives a radio signal modulated with downlink data from base station apparatus 100 via antenna 209, down-converts it to a baseband signal, and receives the received data as channel estimation section 205. And output to the received data demodulation section 206.

  The scheduling unit 204 performs MAC layer processing. The scheduling unit 104 performs mapping between logical channels and transport channels, downlink and uplink scheduling (HARQ processing, selection of transport format, etc.), and the like. Since the scheduling unit 204 controls the processing units of each physical layer in an integrated manner, the scheduling unit 204, the antenna 209, the data control unit 201, the transmission data modulation unit 202, the channel estimation unit 205, the reception data demodulation unit 206, the data There is an interface between the extraction unit 207 and the wireless unit 203.

  In downlink scheduling, the scheduling unit 204 controls reception of transport channels, physical signals, and physical channels based on scheduling information (transport format and HARQ retransmission information) from the base station apparatus 100 and the upper layer 208, and the like. Scheduling information used for HARQ retransmission control and downlink scheduling is generated. The scheduling information used for downlink scheduling is output to the data control unit 201.

  In uplink scheduling, the scheduling unit 204 receives the uplink buffer status input from the higher layer 208 and uplink scheduling information from the base station apparatus 100 input from the data extraction unit 207 (transport format and HARQ retransmission). Information), and scheduling processing for mapping the uplink logical channel input from the upper layer 208 to the transport channel and the uplink scheduling based on the scheduling information input from the upper layer 208, etc. Scheduling information to be generated is generated. Note that the information notified from the base station apparatus 100 is used for the uplink transport format. The scheduling information is output to the data control unit 201.

  Also, the scheduling unit 204 maps the uplink logical channel input from the higher layer 208 to the transport channel, and outputs it to the data control unit 201. The scheduling unit 204 also outputs the channel state information input from the channel estimation unit 205 and the CRC (Cyclic Redundancy Check) confirmation result input from the data extraction unit 207 to the data control unit 201. In addition, the scheduling unit 204 processes the control data and the transport channel acquired in the downlink input from the data extraction unit 207 as necessary, maps them to the downlink logical channel, and outputs them to the upper layer 208. To do.

  Channel estimation section 205 estimates the downlink channel state from the downlink reference signal and outputs the estimation result to reception data demodulation section 206 in order to demodulate the downlink data. Further, the channel estimation unit 205 estimates the downlink channel state from the downlink reference signal in order to notify the base station apparatus 100 of the estimation result of the downlink channel state, and uses this estimation result as channel state information. To the scheduling unit 204.

  Received data demodulation section 206 demodulates received data modulated by the OFDM method. Reception data demodulation section 206 performs demodulation processing on the modulated data input from radio section 203 based on the downlink channel state estimation result input from channel estimation section 205 and outputs the result to data extraction section 207. To do.

  The data extraction unit 207 performs CRC on the data input from the reception data demodulation unit 206 to confirm the correctness and outputs a confirmation result (information indicating ACK or NACK) to the scheduling unit 204. The data extraction unit 207 separates the data input from the reception data demodulation unit 206 into transport channel and physical layer control data, and outputs the data to the scheduling unit 204. The separated control data includes scheduling information such as downlink or uplink resource allocation and uplink HARQ control information.

  The upper layer 208 performs processing of a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. The upper layer 208 integrates and controls the processing units of the lower layer, so that the upper layer 208, the scheduling unit 204, the antenna 209, the data control unit 201, the transmission data modulation unit 202, the channel estimation unit 205, the reception data demodulation unit 206, an interface between the data extraction unit 207 and the wireless unit 203 exists.

  The upper layer 208 has a radio resource control unit 210 (also referred to as a control unit). The radio resource control unit 210 manages various setting information, system information, paging control, own station communication status, mobility management such as handover, buffer status management, unicast and multicast bearer connection setting. Management and management of mobile station identifier (UEID).

(First embodiment)
Next, a first embodiment in a mobile communication system using the base station apparatus 100 and the mobile station apparatus 200 will be described.

[DMRS transmission method]
The DMRS transmission method according to the present embodiment (not using IFDM) will be described below. FIG. 4 is a diagram illustrating a DMRS transmission method (not using IFDM). In FIG. 4, the vertical axis represents the frequency axis, and one grid represents subcarriers. Further, the horizontal axis is a time axis, and the time is divided by a unit that converts the frequency domain to the time domain and assigns a cyclic prefix. This is also referred to as a 1SC-FDMA symbol.

Here, an area defined by consecutive subcarriers of “N ^RB _SC ” in the frequency domain and consecutive SC-FDMA symbols of “N ^UL _symb ” in the time domain is defined as one physical resource block (PRB). Hereinafter also referred to as a resource block). One resource block is configured by resource elements of “N ^RB _SC × N ^UL _symb ” corresponding to one uplink slot.

That is, “N ^RB _SC ” indicates the resource block size in the frequency domain expressed as the number of subcarriers. Hereinafter, as an example, “N ^RB _SC ” is described as 12 subcarriers. That is, the number of subcarriers in the frequency domain of one resource block is described as 12 subcarriers.

“N ^UL _symb ” indicates the number of SC-FDMA symbols in one uplink slot. Hereinafter, as an example, “N ^UL _symb ” is described as a 7SC-FDMA symbol or a 6SC-FDMA symbol. That is, the number of symbols in the time domain of one resource block is described as a 7SC-FDMA symbol or a 6SC-FDMA symbol.

  Also, for example, as shown in FIG. 4, one slot is composed of consecutive 7SC-FDMA symbols, and one subframe is composed of two slots. Here, one subframe is a minimum division unit of resource allocation in the time domain, and the base station apparatus schedules the mobile station apparatus for each subframe using a DCI format transmitted by PDCCH ( assign).

That is, the base station apparatus schedules PUSCH resources using resource allocation information for PUSCH included in the DCI format. Here, the base station apparatus schedules PUSCH resources in units of resource blocks. Hereinafter, the bandwidth scheduled for PUSCH transmission (uplink transmission) expressed as the number of subcarriers is also referred to as “M ^PUSCH _SC ”.

  Here, for example, as shown in FIG. 4, the DMRS is arranged in the third SC-FDMA symbol and the tenth SC-FDMA symbol of each subframe. Hereinafter, the DMRS transmitted using the third SC-FDMA symbol is also referred to as a first DMRS, and the DMRS transmitted using the tenth SC-FDMA symbol is also referred to as a second DMRS.

Further, as shown in FIG. 4, the first DMRS, to produce a second DMRS, base sequence _{^{"γ - u, v (n}} )" is used (use). Here, a cyclic shift is applied to the base sequence, and a reference signal sequence “γ ^(α) _{u, v} (n)” is generated. For example, the reference signal sequence is generated by Expression (1).

  Here, “α” indicates a cyclic shift, and is notified by, for example, downlink control information included in the DCI format (for example, information indicating a cyclic shift and an orthogonal cover code for the DMRS). .

“M ^RS _SC ” indicates the length of the reference signal sequence, and is defined by “M ^RS _SC = mN ^RB _SC (1 ≦ m ≦ N ^{max, UL} _RB )”. Here, “N ^{max, UL} _RB ” is a setting of the maximum uplink bandwidth expressed by a multiple of “N ^RB _SC ”. Here, for example, when the mobile station apparatus multiplexes DMRS with PUSCH, it is defined as “M ^RS _SC = M ^PUSCH _SC ”.

  Hereinafter, it is basically described that the mobile station apparatus multiplexes DMRS with PUSCH and transmits multiplexed DMRS and PUSCH. However, the mobile station apparatus multiplexes DMRS with other physical channels, and multiplexes them. Of course, when transmitting the DMRS and other physical channels, the same modes as the following modes can be applied.

The base sequence _{^{"γ - u, v (0}} ), ..., γ - u, v (M RS SC -1)" Defining depends on the length of the sequence of the "M ^RS _SC". That is, when the mobile station apparatus multiplexes DMRS with PUSCH (in the case of “M ^RS _SC = M ^PUSCH _SC ”), different bases are set according to the bandwidth “M ^PUSCH _SC ” scheduled for PUSCH transmission. A sequence is used.

Further, in FIG. 4, an Orthogonal Cover Code (OCC) is applied to the reference signal sequence to generate a demodulated reference signal sequence “γ ^(λ) _PUSCH (m · M ^RS _SC + n)”. The For example, the demodulation reference signal sequence is generated by Expression (2).

Here, “λ” is defined by “λε {0, 1,..., Υ−1}”, and “υ” indicates the number of transmission layers. For example, it is indicated by “m = 0 or 1”. For example, it is indicated by “n = M ^RS _SC −1”.

Further, “W ^(λ) _(m) ” indicates an ortholog sequence, and indicates, for example, downlink control information included in the DCI format (for example, a cyclic shift and an ortho cover code for DMRS). Information). For example, based on the downlink control information notified by the base station apparatus, the mobile station apparatus “W1 = + 1, W2 = + 1”, “W1 = + 1, W2 = −1”, etc. with respect to the reference signal sequence Apply the official cover code.

  Here, W1 is a weight multiplied by the entire first DMRS. When OCC is represented by a vector such as [+1, −1], the first element is W1 and the second element is Corresponds to W2. That is, the entire reference signal sequence is multiplied by W1 and W2 to generate a demodulated reference signal sequence.

  As described above, the mobile station apparatus generates a DMRS and transmits the generated DMRS (without using IFDM). That is, the mobile station apparatus multiplexes DMRS with PUSCH, and transmits the multiplexed DMRS and PUSCH. That is, the mobile station apparatus transmits DMRS and PUSCH in a time multiplexed manner.

[Transmission method of DMRS using IFDM]
Hereinafter, a DMRS transmission method using IFDM according to the present embodiment will be described. FIG. 5 is a diagram illustrating a DMRS transmission method using IFDM. Here, the upper part of FIG. 5 corresponds to FIG. That is, the reference signal sequence generation method and the demodulation reference signal sequence generation method described above are also applied to DMRS transmission using IFDM.

  As shown in FIG. 5, in DMRS transmission using IFDM, DMRSs are arranged on subcarriers (may be resources or resource elements) at certain intervals (this arrangement is also called a comb spectrum arrangement). ). That is, DMRSs are discretely arranged (distributed arrangement) at certain subcarrier intervals.

  The upper part of FIG. 5 shows that DMRS is arranged every three subcarriers. For example, DMRS is arranged for every three subcarriers in the third SC-FDMA symbol and the tenth SC-FDMA symbol of one subframe.

The lower part of FIG. 5 shows the third SC-FDMA symbol in which DMRS is arranged in more detail, and the horizontal axis shows the frequency axis. Here, the subcarrier in which the DMRS is arranged is determined by, for example, a frequency offset “n ^RE _OFFSET ” and a repetition factor “n ^DMRS _RPF ” (RPF: Repetition Factor).

  That is, the start position of the subcarrier in which DMRS is arranged is determined by the frequency offset (frequency offset value). Here, the frequency offset value is also referred to as a subcarrier offset value. The frequency offset value is also referred to as an IFDM transmission comb.

  For example, the base station apparatus transmits the frequency offset value using RRC signaling (may be dedicated signaling). Further, for example, the frequency offset value may be calculated by the mobile station apparatus using downlink control information notified by the base station apparatus. For example, the base station apparatus transmits downlink control information for the mobile station apparatus to calculate a frequency offset value using RRC signaling (may be dedicated signaling). Further, for example, the base station apparatus transmits downlink control information for the mobile station apparatus to calculate a frequency offset value in the DCI format.

  Further, the interval between subcarriers in which DMRS is arranged is determined by a repetition factor (repetition factor value). For example, the base station apparatus transmits the repetition factor value using RRC signaling (may be dedicated signaling). Further, for example, the base station apparatus transmits the repetition factor value included in the DCI format. The mobile station apparatus arranges DMRSs on subcarriers at certain intervals according to the repetition factor value transmitted by the base station apparatus. Here, the repetition factor value may be defined in advance according to specifications or the like. For example, the repetition factor value may be defined in advance as “2” or “3” depending on the specification or the like.

  As described above, the mobile station apparatus generates a DMRS and transmits the generated DMRS using IFDM. That is, the mobile station apparatus multiplexes DMRS arranged at a constant subcarrier interval with PUSCH, and transmits the multiplexed DMRS and PUSCH. That is, the mobile station apparatus transmits DMRS and PUSCH in a time multiplexed manner.

[Generate base sequence]
Hereinafter, a method for generating a base sequence according to the present embodiment will be described. The base sequence generation method described below is applied to both DMRS transmission not using IFDM and DMRS transmission using IFDM. That is, the base sequence for transmitting DMRS without using IFDM and the base sequence for transmitting DMRS using IFDM are generated by the same method.

Here, as described above, the base sequence “γ ^- _{u, v} (0),..., Γ ^- _{u, v} (M ^RS _SC −1)” is the reference signal sequence “M ^RS _SC = mN ^RB _SC ”. Depends on the length of

For example, for ^{_{"M RS SC ≧ 3N RB SC}} ", the base sequence _{^{"γ - u, v (0}} ), ..., γ - u, v (M RS SC -1)" is given by Equation (3) It is done.

  Here, the q-th root Zadoff-Chu sequence is defined by Equation (4).

  Here, q is given by Equation (5) and Equation (6).

Also, the length “N ^RS _ZC ” of the Zadoff-Chu sequence is given by the maximum prime number that satisfies “N ^RS _ZC <M ^RS _SC ”.

Furthermore, for _{^{example, "M RS SC = N RB}} SC" against the _{^{"M RS SC = 2N RB SC}} ", the base sequence _{^{"γ - u, v (0}} ), ..., γ - u, v (M RS SC -1) "is given by equation (7).

Here, for example, φ (n) is defined in a table as shown in FIG. 6 for “M ^RS _SC = N ^RB _SC ”. For example, φ (n) is defined in a table as shown in FIG. 7 for “M ^RS _SC = 2N ^RB _SC ”. That is, by generating the base sequence depending on the length of the reference signal sequence, DMRS can be transmitted using a base sequence with higher orthogonality.

For example, when the DMRS is multiplexed with the PUSCH (when “M ^RS _SC = M ^PUSCH _SC ”), the mobile station apparatus may have a small bandwidth scheduled for PUSCH transmission (for example, “M ^RS _{SC SC} = N ^RB _SC ”or“ M ^RS _SC = 2N ^RB _SC ”(that is, even if only one resource block or two resource blocks are scheduled), a predefined table as shown in FIG. 6 or FIG. By generating a base sequence according to a table capable of generating a base sequence with higher orthogonality, it is possible to transmit DMRS using the base sequence with higher orthogonality.

[DMRS transmission control]
FIG. 8 is a diagram illustrating an example of DMRS transmission control according to the embodiment of the present invention.

  In the embodiment of the present invention, the base station apparatus transmits resource allocation information for PUSCH to the mobile station apparatus, and the mobile station apparatus is the subcarrier interval (information equivalent to the repetition factor value) in which DMRS is arranged. Is equal to 2 or more subcarrier intervals and resource allocation information, DMRSs are arranged at intervals of 2 or more subcarriers (equivalent to performing DMRS transmission using IFDM). Equivalent to allocating DMRS to consecutive subcarriers (transmitting DMRS without using IFDM, or transmitting DMRS using IFDM with a repetition factor value set to “1”) Determine).

  Also, when the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size, the mobile station apparatus arranges DMRSs on consecutive subcarriers.

  In addition, the mobile station apparatus, when the subcarrier interval is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, Place on the carrier.

  Also, the base station apparatus assigns resource allocation information for PUSCH and instruction information indicating whether or not DMRSs are arranged at intervals of two or more subcarriers (equivalent to information that enables or disables DMRS transmission using IFDM). Is included in the downlink control information format, and is transmitted to the mobile station apparatus. When the subcarrier interval in which the DMRS is arranged is 2 or more, the mobile station apparatus has an interval of 2 or more subcarriers. Based on the resource allocation information and the instruction information, it is determined whether to arrange DMRS at intervals of two or more subcarriers or to arrange DMRS on consecutive subcarriers.

  Further, the mobile station apparatus has a subcarrier interval of 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information indicates the DMRS In the case where it is shown that two or more subcarriers are arranged (when DMRS transmission using IFDM is enabled), the DMRS is arranged at two or more subcarrier intervals, and the resource allocation information is predetermined. If the DMRS is not arranged at intervals of two or more subcarriers (if DMRS transmission using IFDM is invalid), the DMRS Are arranged on consecutive subcarriers.

  Further, the mobile station apparatus has a subcarrier interval of 2 or more, the resource allocation information indicates a resource block size of a predetermined second resource block size or more, and the indication information indicates a DMRS of 2 or more subcarriers. In the case where it is indicated that they are arranged at carrier intervals, DMRSs are arranged at intervals of two or more subcarriers, and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, or If the instruction information indicates that DMRS is not arranged at intervals of two or more subcarriers, DMRS is arranged on consecutive subcarriers.

  Here, as described above, the information indicating the interval between the subcarriers in which the uplink demodulation reference signal is arranged is reported to the mobile station apparatus by the base station apparatus as a repetition factor value.

  Further, the first resource block size is expressed by a subcarrier. Further, the second resource block size is expressed by a subcarrier. Furthermore, the third resource block size is represented by subcarriers.

  As described above, in FIG. 8, for example, the base station apparatus sets a frequency offset used when the mobile station apparatus transmits DMRS. Further, for example, the base station apparatus sets a repetition factor used when the mobile station apparatus transmits DMRS.

  Further, in FIG. 8, the base station apparatus sets (may be set) to the mobile station apparatus to arrange and transmit DMRS to subcarriers at a constant interval (interval indicated by the repetition factor). That is, the base station apparatus sets to the mobile station apparatus that DMRSs are arranged on subcarriers at regular intervals. That is, the base station apparatus sets DMRS transmission using IFDM to the mobile station apparatus.

  Here, the mobile station apparatus set to transmit DMRS using IFDM by the base station apparatus can transmit DMRS using IFDM. That is, the mobile station apparatus set to transmit DMRS using IFDM by the base station apparatus can transmit DMRS using IFDM or transmit DMRS without using IFDM.

  Here, for example, the base station apparatus sets DMRS transmission using IFDM using RRC signaling (may be dedicated signaling). Further, for example, the base station apparatus sets DMRS transmission using IFDM using a MAC control element. For example, DMRS transmission using IFDM is represented by 1-bit information, and when 1-bit information is set to “0”, “not set” and 1-bit information is set to “1”. When defined, it is defined as “set”.

  Here, “not set” or “set” for DMRS transmission using IFDM by the base station apparatus may be linked to the setting of the repetition factor value. For example, the base station apparatus may set DMRS transmission using IFDM by setting the repetition factor value to “2” or “3”. Here, when the repetition factor value is set to “1” by the base station apparatus, this is equivalent to the fact that DMRS transmission using IFDM is not set.

  That is, the base station apparatus can “not set” or “set” transmission of DMRS using IFDM by setting the factor value repeatedly. For example, the base station apparatus “not set” transmission of DMRS using IFDM by setting the repetition factor value to “1” (“set” transmission of DMRS not using IFDM), and the repetition factor value. Can be set to be larger than “1” to “set” DMRS transmission using IFDM.

  By making “not set” or “set” DMRS transmission using IFDM in this way, the base station apparatus clearly indicates information for “not set” or “set” DMRS transmission using IFDM. This eliminates the need for transmission and reduces overhead.

  FIG. 8 shows that the base station apparatus sets DMRS transmission using IFDM and sets “x (X)” as the repetition factor value (step 801). Here, when the transmission of DMRS using IFDM is not set (step 801: NO), the mobile station apparatus does not transmit DMRS using IFDM. Hereinafter, the fact that the mobile station apparatus does not transmit DMRS using IFDM is also referred to as turning off transmission of DMRS using IFDM (step 802).

  That is, a mobile station apparatus that does not transmit DMRS using IFDM arranges DMRS on consecutive subcarriers as described in FIG. That is, the mobile station apparatus multiplexes DMRS arranged on consecutive subcarriers with PUSCH, and transmits the multiplexed DMRS and PUSCH.

  Here, the mobile station apparatus arranging DMRS on consecutive subcarriers is the same as arranging DMRS on subcarriers with a repetition factor value of “1”. As described above, the base station apparatus can set DMRS transmission that does not use IFDM by setting the repetition factor value to “1”. This is the same as DMRS transmission using IFDM in which the base station apparatus has the repetition factor value set to “1”. That is, the mobile station apparatus arranges DMRS on consecutive subcarriers in the same manner as when “1” is set as the repetition factor value and DMRS is arranged on the subcarrier based on the repetition factor value.

  Further, when the DMRS transmission using IFDM is set (step 801: YES), the mobile station apparatus confirms (recognizes and identifies) a condition as to whether or not to perform DMRS transmission using IFDM. (Step 803).

  That is, when the condition for enabling transmission of DMRS using IFDM is satisfied (step 803: YES), the mobile station apparatus transmits DMRS using IFDM. Hereinafter, the transmission of DMRS using IFDM by the mobile station apparatus is also referred to as turning on the transmission of DMRS using IFDM (step 804).

  That is, a mobile station apparatus that performs DMRS transmission using IFDM arranges DMRSs on subcarriers at regular intervals, as described in FIG. That is, the mobile station apparatus arranges DMRS on subcarriers for each “x” according to “x” indicated by the repetition factor value. That is, the mobile station apparatus multiplexes DMRS arranged on subcarriers for each “x” with PUSCH, and transmits the multiplexed DMRS and PUSCH.

  Also, the mobile station apparatus, when the condition for enabling DMRS transmission using IFDM is not satisfied (when the condition for invalidating DMRS transmission using IFDM is satisfied) (step 803). : NO), DMRS transmission using IFDM is turned off (step 805).

  As described above, a mobile station apparatus that has turned off DMRS transmission using IFDM arranges DMRS on consecutive subcarriers. That is, the mobile station apparatus multiplexes DMRS arranged on consecutive subcarriers with PUSCH, and transmits the multiplexed DMRS and PUSCH.

  Here, DMRS transmission using IFDM is set by the base station apparatus (a frequency offset value and / or a repetition factor value for DMRS transmission using IFDM may be set), and further, IFDM is used. When DMRS transmission is disabled, the mobile station apparatus also describes that DMRS transmission using IFDM is not applied (N / A: not applicable).

  That is, the mobile station apparatus in which DMRS transmission using IFDM is set determines whether DMRSs are arranged on subcarriers at regular intervals or DMRSs are arranged on continuous subcarriers based on a predetermined condition. To do. That is, the mobile station apparatus arranges DMRS on subcarriers at regular intervals when a predetermined condition is satisfied, and arranges DMRS on consecutive subcarriers when the predetermined condition is not satisfied. .

  Here, the predetermined condition includes that the interval between the subcarriers indicated by the repetition factor value is 2 or more. As described above, the base station apparatus sets the repetition factor value using RRC signaling (may be dedicated signaling).

  That is, when the interval between subcarriers indicated by the repetition factor value is 2 or more, the mobile station apparatus arranges DMRSs on the subcarriers at regular intervals. Also, when the subcarrier interval indicated by the repetition factor value is 1, the mobile station apparatus arranges DMRSs on consecutive subcarriers.

Also, the predetermined condition includes that the PUSCH resource block size scheduled by the base station apparatus is a third resource block size other than the predetermined first resource block size. Further, the predetermined condition includes that the resource block size of PUSCH scheduled by the base station apparatus is equal to or larger than a predetermined second resource block size. As described above, the base station apparatus notifies the PUSCH resource block size (that is, the bandwidth “M ^PUSCH _SC ”) using the resource allocation information for the PUSCH included in the DCI format.

  That is, when the resource block size indicated by the resource allocation information is a third resource block size other than the predetermined first resource block size, the mobile station apparatus arranges DMRS on subcarriers at regular intervals. . In addition, when the resource block size indicated by the resource allocation information is equal to or larger than a predetermined second resource block size, the mobile station apparatus arranges DMRSs on subcarriers at regular intervals.

  Further, when the resource block size indicated by the resource allocation information is a predetermined first resource block size, the mobile station apparatus arranges DMRSs on consecutive subcarriers. In addition, when the resource block size indicated by the resource allocation information is smaller than the predetermined second resource block size, the mobile station apparatus arranges DMRS on consecutive subcarriers.

  Here, when the subcarrier interval indicated by the repetition factor value is 2 or more and the resource block size indicated by the resource allocation information is a predetermined first resource block size, the mobile station apparatus uses DMRS. Are arranged on consecutive subcarriers.

  That is, the mobile station apparatus is instructed by a physical layer (PHY layer: physical layer, lower layer: also called lower layer) rather than a condition set by an upper layer (RRC layer and / or MAC layer). Priority. That is, the condition indicated by the DCI format transmitted by PDCCH has a higher priority than the condition set by RRC signaling.

  Similarly, when the subcarrier interval indicated by the repetition factor value is 2 or more and the resource block size indicated by the resource allocation information is smaller than the predetermined second resource block size, the mobile station apparatus , DMRS are arranged on consecutive subcarriers.

  Further, the predetermined condition may include that instruction information for validating or invalidating transmission of DMRS using IFDM indicates validity. Here, the instruction information is included in the DCI format. That is, the base station apparatus transmits the instruction information indicating whether or not to transmit DMRS on subcarriers at regular intervals in the DCI format.

  Here, for example, the instruction information is represented by 1-bit information, and when 1-bit information is set to “0”, “DMRS transmission using IFDM is invalid”, 1-bit information is When it is set to “1”, it is defined as “Enable DMRS transmission using IFDM”.

  Further, for example, the instruction information may be identified by setting predetermined downlink control information included in the DCI format to a predetermined value. For example, in the mobile station apparatus, the information indicating the cyclic shift and the orthogonal cover code for the DMRS included in the DCI format is set to a predetermined value (for example, all the 3-bit information is “0”). By identifying this, transmission of DMRS using IFDM may be enabled or disabled. Here, when which downlink control information included in the DCI format is set to which value, whether DMRS transmission using IFDM is enabled or disabled is defined in advance by specifications or the like.

  That is, when the instruction information indicates that DMRS transmission using IFDM is valid, the mobile station apparatus arranges DMRS on subcarriers at regular intervals. Also, when the instruction information indicates that the DMRS transmission using IFDM is invalid, the mobile station apparatus arranges the DMRS on consecutive subcarriers.

  That is, the mobile station apparatus has a third resource block whose subcarrier interval indicated by the repetition factor value is 2 or more and whose resource block size indicated by the resource allocation information is other than a predetermined first resource block size If the instruction information indicates that the DMRS transmission using IFDM is valid, the DMRSs are arranged on the subcarriers at regular intervals.

  Further, the mobile station apparatus has a subcarrier interval indicated by the repetition factor value of 2 or more, a resource block size indicated by the resource allocation information is a predetermined second resource block size or more, and indicates When the information indicates that DMRS transmission using IFDM is valid, DMRSs are arranged on subcarriers at regular intervals.

  Here, for example, in the mobile station apparatus, the subcarrier interval indicated by the repetition factor value is 2 or more, and the resource block size indicated by the resource allocation information is greater than or equal to a predetermined second resource block size, If the instruction information indicates that DMRS transmission using IFDM is invalid, the DMRS is arranged on consecutive subcarriers.

  That is, the mobile station apparatus arranges DMRSs on subcarriers at regular intervals only when all information (conditions) transmitted in the physical layer indicates that they are effective for DMRS transmission using IFDM. . For example, the mobile station apparatus arranges DMRSs on subcarriers at regular intervals only when both resource allocation information and instruction information included in the DCI format satisfy predetermined conditions. That is, when any one of the resource allocation information and the instruction information included in the DCI format does not satisfy the predetermined condition, the mobile station apparatus arranges the DMRS on continuous subcarriers.

  As described above, in the mobile station apparatus, the subcarrier interval indicated by the repetition factor value indicates 1, or the resource block size indicated by the resource allocation information indicates a predetermined first resource block size Alternatively, if the instruction information indicates that the DMRS transmission using IFDM is invalid, the DMRS is arranged on consecutive subcarriers and transmitted.

  Further, the mobile station apparatus indicates a resource block size in which the subcarrier interval indicated by the repetition factor value indicates 1, or the resource block size indicated by the resource allocation information is smaller than a predetermined second resource block size Alternatively, if the instruction information indicates that the DMRS transmission using IFDM is invalid, the DMRS is arranged on consecutive subcarriers and transmitted.

  As described above, the base station apparatus sets DMRS transmission using IFDM (in the upper layer), and further enables or disables DMRS transmission using IFDM (in the physical layer). Allows more flexible and robust transmission of DMRS. For example, the base station device sets DMRS transmission using IFDM using RRC signaling, and further enables or disables DMRS transmission using IFDM using information included in the DCI format. Allows more flexible and robust transmission of DMRS.

  For example, when the base station apparatus uses the information included in the DCI format to enable or disable transmission of DMRS using IFDM, the base station apparatus Communication of the mobile station device can be continued. For example, a period in which the base station apparatus sets DMRS transmission using IFDM using RRC signaling (that is, DMRS transmission using IFDM is set between the base station apparatus and the mobile station apparatus). Between the base station apparatus and the mobile station apparatus by enabling or disabling the transmission of DMRS using IFDM using information included in the DCI format during a period when it is unclear whether it is set or not set. It is possible to avoid inconsistencies in settings due to.

  9 and 10 are other diagrams showing examples of DMRS transmission control according to the present embodiment. Here, FIGS. 9 and 10 show FIG. 8 in more detail, and correspond to FIG. 9 and 10 illustrate transmission control when the mobile station apparatus multiplexes DMRS with PUSCH and transmits the multiplexed DMRS and PUSCH.

Further, as described above, in FIGS. 9 and 10, “x (X)” indicates a repetition factor. “M ^RS _SC ” indicates the length of the reference signal sequence. “N ^RB _SC ” indicates a resource block size in the frequency domain expressed as the number of subcarriers, and is described as 12 subcarriers as an example. That is, the number of subcarriers in the frequency domain of one resource block is described as 12 subcarriers. “M ^PUSCH _SC ” indicates a bandwidth scheduled for PUSCH transmission (uplink transmission) expressed as the number of subcarriers.

  In FIG. 9, the base station apparatus sets DMRS transmission using IFDM, and sets “x (X)” as a repetition factor value (step 901). Here, when the DMRS transmission using IFDM is not set (step 901: NO), the mobile station apparatus does not transmit the DMRS using IFDM (FIG. 10: to step 1001).

That is, as shown in FIG. 10, the mobile station apparatus confirms whether or not “M ^RS _SC ≧ 3N ^RB _SC ” (step 1001). That is, the mobile station apparatus checks whether “M ^PUSCH _SC ” is ^{equal to} or greater than 36 subcarriers. That is, the mobile station apparatus confirms whether PUSCH resources of 3 resource blocks or more are scheduled based on the resource allocation information.

Here, if “M ^RS _SC ≧ 3N ^RB _SC ” is not satisfied (step 1001: NO), the mobile station apparatus follows “M ^RS _SC = N ^RB _SC ” or “M ^RS _SC = 2N ^RB _SC ” (step 1001). 1002), the base sequence is generated using the equation (7) described above (step 1003). At this time, as described above, “M ^RS _SC = M ^PUSCH _SC ” is defined. As described above, since the base station apparatus allocates PUSCH resources in units of resource blocks, “M ^RS _SC ” is always “N ^RB _SC ” or “2N ^RB _SC ”.

That is, when “M ^PUSCH _SC ” has 12 subcarriers, the mobile station apparatus generates a base sequence using a table as shown in FIG. That is, when a PUSCH resource of one resource block is scheduled according to resource allocation information, the mobile station apparatus generates a base sequence using a table as shown in FIG.

Also, when “M ^PUSCH _SC ” is 24 subcarriers, the mobile station apparatus generates a base sequence using a table as shown in FIG. That is, when a PUSCH resource of 2 resource blocks is scheduled according to resource allocation information, the mobile station apparatus generates a base sequence using a table as shown in FIG.

  Further, the mobile station apparatus generates DMRS using the base sequence, and arranges the generated DMRS on consecutive subcarriers. Also, the mobile station apparatus multiplexes DMRSs arranged on consecutive subcarriers with PUSCH, and transmits the multiplexed DMRS and PUSCH.

Here, in the case of “M ^RS _SC ≧ 3N ^RB _SC ” (step 1001: YES), the mobile station apparatus generates a base sequence using the above-described equation (3) (step 1004). . At this time, as described above, “M ^RS _SC = M ^PUSCH _SC ” is defined.

  Further, the mobile station apparatus generates DMRS using the base sequence, and arranges the generated DMRS on consecutive subcarriers. Also, the mobile station apparatus multiplexes DMRSs arranged on consecutive subcarriers with PUSCH, and transmits the multiplexed DMRS and PUSCH.

  Returning to FIG. 9, when the DMRS transmission using IFDM is set (step 901: YES), the mobile station apparatus determines whether the DMRS transmission using IFDM is valid or invalid. Is confirmed (step 902).

That is, the mobile station apparatus determines whether the length of the reference signal sequence determined based on the repetition factor “x” (hereinafter also referred to as the number of subcarriers in which DMRS is arranged) is “3N ^RB _SC ” or more. Confirm. That is, the mobile station apparatus checks whether the result of dividing “M ^PUSCH _SC ” by “x” is equal to or greater than 36 subcarriers. That is, the mobile station apparatus confirms whether or not PUSCH resources of (3 resource blocks × “x”) or more are scheduled based on the resource allocation information.

Here, when the number of subcarriers on which DMRS is arranged is “3N ^RB _SC ” or more (step 902: YES), the mobile station apparatus validates DMRS transmission using IFDM and has been described above. A base sequence is generated using equation (3) (step 903). At this time, for example, “M ^RS _SC ” is defined as the length of the reference signal sequence determined based on the repetition factor value “x” (may be the number of subcarriers in which DMRS is arranged). For example, “M ^RS _SC ” is defined as a result of dividing “M ^PUSCH _SC ” by “x”.

  Furthermore, the mobile station apparatus generates DMRS using the base sequence, and arranges the generated DMRS on the subcarriers at regular intervals (at intervals according to repetition factor value “x”). In addition, the mobile station apparatus multiplexes DMRSs arranged on subcarriers at regular intervals with PUSCH, and transmits the multiplexed DMRS and PUSCH.

Also, when the number of subcarriers in which DMRS is allocated is smaller than “3N ^RB _SC ” (step 902: NO), the mobile station apparatus sets the number of subcarriers in which DMRS is allocated to “N ^RB _SC. "Or" 2N ^RB _SC "is confirmed (step 904).

  That is, the mobile station apparatus confirms whether the number of subcarriers in which DMRS is arranged is 12 subcarriers or 24 subcarriers. That is, the mobile station apparatus confirms whether (1 resource block × “x”) or (2 resource block × “x”) PUSCH resource is scheduled according to the resource allocation information.

Here, when the number of subcarriers on which DMRS is arranged is “N ^RB _SC ” or “2N ^RB _SC ” (step 904: YES), the mobile station apparatus validates DMRS transmission using IFDM. The base sequence is generated using Equation (7) described above (step 903). At this time, for example, “M ^RS _SC ” is defined as the length of the reference signal sequence determined based on the repetition factor value “x” (may be the number of subcarriers in which DMRS is arranged). For example, “M ^RS _SC ” is defined as a result of dividing “M ^PUSCH _SC ” by “x”.

  That is, when the number of subcarriers in which DMRS is arranged is 12 subcarriers, the mobile station apparatus generates a base sequence using a table as shown in FIG. That is, when a PUSCH resource of (1 resource block × “x”) is scheduled according to resource allocation information, the mobile station apparatus generates a base sequence using a table as shown in FIG. .

  Further, when the number of subcarriers in which DMRS is arranged is 24 subcarriers, the mobile station apparatus generates a base sequence using a table as shown in FIG. That is, when (2 resource blocks × “x”) PUSCH resources are scheduled according to the resource allocation information, the mobile station apparatus generates a base sequence using a table as shown in FIG. .

  Furthermore, the mobile station apparatus generates DMRS using the base sequence, and arranges the generated DMRS on the subcarriers at regular intervals (at intervals according to repetition factor value “x”). Further, the mobile station apparatus multiplexes DMRSs arranged on subcarriers at regular intervals with PUSCH, and transmits the multiplexed DMRS and PUSCH.

In addition, when the number of subcarriers in which DMRS is arranged is not “N ^RB _SC ” or “2N ^RB _SC ” (step 904: NO), the mobile station apparatus does not transmit DMRS using IFDM ( Step 906). That is, the base station apparatus allocates PUSCH resources in units of resource blocks. However, since the number of subcarriers in which DMRS is arranged changes according to the repetition factor value “x”, “M ^RS _SC ” becomes “N ^RB _SC Or “2N ^RB _SC ”. That is, the number of subcarriers in which DMRS is arranged is determined based on the resource block size scheduled for PUSCH transmission (that is, bandwidth “M ^PUSCH _SC ”) and repetition factor value “x”. At this time, the mobile station apparatus performs the same control as when DMRS transmission using IFDM is not set (ie, to step 1001 in FIG. 10).

  As described above, when the mobile station apparatus transmits the DMRS using IFDM, the base sequence used for generating the DMRS is determined depending on the length of the reference signal sequence. Thus, DMRS can be generated using a base sequence with higher orthogonality.

  That is, when a mobile station apparatus multiplexes DMRS with PUSCH and transmits it, different base sequences can be used according to the resource block size (bandwidth) scheduled for PUSCH transmission. It is possible to generate a DMRS using a base sequence with high orthogonality.

  Further, even when a small-sized resource block (for example, one resource block or two resource blocks) is scheduled by the base station apparatus, by generating a base sequence according to a predefined table, more orthogonality can be achieved. DMRS can be transmitted using a high base sequence.

  That is, the mobile station apparatus can transmit DMRS using a base sequence having higher orthogonality, and demodulates without degrading the quality of information (for example, PUSCH) multiplexed and transmitted with DMRS. Is possible.

  Furthermore, by generating the base sequence for DMRS transmission not using IFDM and the base sequence for DMRS transmission using IFDM by the same method, DMRS transmission not using IFDM and DMRS transmission using IFDM are performed. Can be mixed more easily.

  The embodiment described above is also applied to an integrated circuit mounted on a base station apparatus and a mobile station apparatus. Further, in the embodiment described above, each function in the base station device and a program for realizing each function in the mobile station device are recorded on a computer-readable recording medium and recorded on this recording medium. The base station apparatus and the mobile station apparatus may be controlled by causing the computer system to read and execute the program. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

100 base station apparatus 101 data control section 102 transmission data modulation section 103 radio section 104 scheduling section 105 channel estimation section 106 reception data demodulation section 107 data extraction section 108 upper layer 109 antenna 110 radio resource control section 200 mobile station apparatus 201 data control section 202 Transmission data modulation section 203 Radio section 204 Scheduling section 205 Channel estimation section 206 Reception data demodulation section 207 Data extraction section 208 Upper layer 209 Antenna 210 Radio resource control section

Claims (26)

A mobile communication system in which a base station apparatus and a mobile station apparatus communicate with each other,
The base station device
Transmitting resource allocation information for the physical uplink shared channel to the mobile station device;
The mobile station device
When the interval between the subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information,
A mobile communication system, comprising: determining whether to arrange the uplink demodulation reference signals at intervals of the two or more subcarriers or to arrange the uplink demodulation reference signals on consecutive subcarriers. The mobile station device
When the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size, the uplink demodulation reference signal is arranged in the continuous subcarriers. The mobile communication system according to claim 1. The mobile station device
When the subcarrier interval is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, the uplink demodulation reference signal is continued. It arrange | positions to a subcarrier. The mobile communication system of Claim 1 or Claim 2 characterized by the above-mentioned. A mobile communication system in which a base station apparatus and a mobile station apparatus communicate with each other,
The base station device
The resource allocation information for the physical uplink shared channel and the instruction information indicating whether the uplink demodulation reference signal is arranged at intervals of two or more subcarriers are included in the downlink control information format and transmitted to the mobile station apparatus. ,
The mobile station device
When the interval between subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information and the indication information,
A mobile communication system, comprising: determining whether to arrange the uplink demodulation reference signals at intervals of the two or more subcarriers or to arrange the uplink demodulation reference signals on consecutive subcarriers. The mobile station device
The subcarrier interval is 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information indicates the uplink demodulation reference signal In the case of indicating that the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers, the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers
When the resource allocation information indicates a predetermined first resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, The mobile communication system according to claim 4, wherein an uplink demodulation reference signal is arranged on the continuous subcarriers. The mobile station device
The interval between the subcarriers is 2 or more, the resource allocation information indicates a resource block size greater than or equal to a predetermined second resource block size, and the indication information indicates the uplink demodulation reference signal or more than 2 The uplink demodulated reference signals are arranged at intervals of the two or more subcarriers,
The resource allocation information indicates a resource block size smaller than a predetermined second resource block size, or the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers 6. The mobile communication system according to claim 4, wherein the uplink demodulation reference signal is arranged on the continuous subcarriers. The information which shows the space | interval of the subcarrier by which the said uplink demodulation reference signal is arrange | positioned is notified to the said mobile station apparatus by the said base station apparatus. The Claim 1 characterized by the above-mentioned. Mobile communication system. The mobile communication system according to any one of claims 1 to 7, wherein the first resource block size, the second resource block size, and the third resource block size are expressed by subcarriers. A base station device that communicates with a mobile station device,
A unit for transmitting resource allocation information for a physical uplink shared channel to the mobile station device;
When the interval between the subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information,
Whether the uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus or the uplink demodulation reference signals arranged on successive subcarriers are received from the mobile station apparatus A unit to determine,
A base station apparatus comprising: When the interval between the subcarriers is 2 or more and the resource allocation information indicates a predetermined first resource block size, the uplink demodulation reference signal arranged in the continuous subcarriers is A unit that receives from the mobile station device,
The base station apparatus according to claim 9, further comprising: When the interval between the subcarriers is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, the subcarriers are arranged on the continuous subcarriers. A unit for receiving an uplink demodulation reference signal from the mobile station apparatus;
The base station apparatus according to claim 9 or 10, comprising the base station apparatus. A base station device that communicates with a mobile station device,
The resource allocation information for the physical uplink shared channel and the instruction information indicating whether the uplink demodulation reference signal is arranged at intervals of two or more subcarriers are included in the downlink control information format and transmitted to the mobile station apparatus. Unit,
When the interval between subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information and the indication information,
The uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus, or the uplink demodulation reference signals arranged on consecutive subcarriers are received from the mobile station apparatus. A unit that decides,
A base station apparatus comprising: The subcarrier interval is 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information indicates the uplink demodulation reference signal A unit that receives the uplink demodulated reference signals arranged at intervals of the two or more subcarriers from the mobile station apparatus when indicating that the two or more subcarriers are arranged at intervals;
When the resource allocation information indicates a predetermined first resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, A unit for receiving, from the mobile station apparatus, the uplink demodulation reference signal arranged in a continuous subcarrier;
The base station apparatus according to claim 12, comprising: The interval between the subcarriers is 2 or more, the resource allocation information indicates a resource block size greater than or equal to a predetermined second resource block size, and the indication information indicates the uplink demodulation reference signal or more than 2 A unit that receives the uplink demodulated reference signals arranged at intervals of the two or more subcarriers from the mobile station apparatus,
The resource allocation information indicates a resource block size smaller than a predetermined second resource block size, or the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers A unit that receives the uplink demodulation reference signal arranged on the continuous subcarriers from the mobile station device, and
The base station apparatus according to claim 12 or 13, characterized by comprising: The base station apparatus according to any one of claims 9 to 14, wherein information indicating an interval between subcarriers in which the uplink demodulation reference signal is arranged is notified to the mobile station apparatus. A mobile station device that communicates with a base station device,
A unit for receiving resource allocation information for a physical uplink shared channel from the base station device;
When the interval between the subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information,
A unit for determining whether to arrange the uplink demodulation reference signal at an interval of the two or more subcarriers or to arrange the uplink demodulation reference signal on consecutive subcarriers;
A mobile station apparatus comprising: When the subcarrier interval is 2 or more and the resource allocation information indicates a predetermined first resource block size, a unit that arranges the uplink demodulation reference signal in the continuous subcarriers The
The mobile station apparatus according to claim 16, further comprising: When the subcarrier interval is 2 or more and the resource allocation information indicates a resource block size smaller than a predetermined second resource block size, the uplink demodulation reference signal is continued. The unit placed on the subcarrier
The mobile station apparatus according to claim 16 or 17, further comprising: A mobile station device that communicates with a base station device,
The resource allocation information for the physical uplink shared channel and the instruction information indicating whether the uplink demodulation reference signal is arranged at intervals of two or more subcarriers are included in the downlink control information format and received from the base station apparatus. Unit,
When the interval between subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information and the indication information,
A unit for determining whether to arrange the uplink demodulation reference signal at an interval of the two or more subcarriers or to arrange the uplink demodulation reference signal on consecutive subcarriers;
A mobile station apparatus comprising: The subcarrier interval is 2 or more, the resource allocation information indicates a third resource block size other than a predetermined first resource block size, and the indication information indicates the uplink demodulation reference signal A unit that arranges the uplink demodulation reference signals at intervals of the two or more subcarriers, when indicating that the uplink demodulation reference signals are arranged at intervals of the two or more subcarriers;
When the resource allocation information indicates a predetermined first resource block size, or when the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers, A unit for arranging an uplink demodulation reference signal on the continuous subcarriers;
The mobile station apparatus according to claim 19, comprising: The interval between the subcarriers is 2 or more, the resource allocation information indicates a resource block size greater than or equal to a predetermined second resource block size, and the indication information indicates the uplink demodulation reference signal or more than 2 A unit that arranges the uplink demodulated reference signals at intervals of the two or more subcarriers,
The resource allocation information indicates a resource block size smaller than a predetermined second resource block size, or the indication information indicates that the uplink demodulation reference signal is not arranged at an interval of the two or more subcarriers A unit for arranging the uplink demodulation reference signal on the continuous subcarriers, and
The mobile station apparatus according to claim 19 or 20, further comprising: The mobile station apparatus according to any one of claims 16 to 21, wherein information indicating an interval of subcarriers in which the uplink demodulation reference signal is arranged is notified by the base station apparatus. A communication method of a base station device that communicates with a mobile station device,
Transmitting resource allocation information for the physical uplink shared channel to the mobile station device;
When the interval between the subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information,
Whether the uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus or the uplink demodulation reference signals arranged on successive subcarriers are received from the mobile station apparatus Determining a communication method. A communication method of a base station device that communicates with a mobile station device,
The resource allocation information for the physical uplink shared channel and the instruction information indicating whether the uplink demodulation reference signal is arranged at intervals of two or more subcarriers are included in the downlink control information format and transmitted to the mobile station apparatus. ,
When the interval between subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information and the indication information,
The uplink demodulation reference signals arranged at intervals of the two or more subcarriers are received from the mobile station apparatus, or the uplink demodulation reference signals arranged on consecutive subcarriers are received from the mobile station apparatus. A communication method characterized by determining whether or not. A communication method of a mobile station apparatus that communicates with a base station apparatus,
Receiving resource allocation information for the physical uplink shared channel from the base station apparatus;
When the interval between the subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information,
A communication method, comprising: determining whether the uplink demodulation reference signal is arranged at intervals of the two or more subcarriers or whether the uplink demodulation reference signal is arranged on continuous subcarriers. A communication method of a mobile station apparatus that communicates with a base station apparatus,
Resource assignment information for the physical uplink shared channel and instruction information indicating whether or not to arrange the uplink demodulation reference signal at intervals of two or more subcarriers are included in the downlink control information format from the base station apparatus. ,
When the interval between subcarriers in which the uplink demodulation reference signal is arranged is 2 or more,
Based on the interval between the two or more subcarriers and the resource allocation information and the indication information,
A communication method, comprising: determining whether the uplink demodulation reference signal is arranged at intervals of the two or more subcarriers or whether the uplink demodulation reference signal is arranged on continuous subcarriers.