WO2012063351A1 - Wireless communication system, transmitter, receiver, wireless communication method, transmission method, and reception method - Google Patents

Wireless communication system, transmitter, receiver, wireless communication method, transmission method, and reception method Download PDF

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Publication number
WO2012063351A1
WO2012063351A1 PCT/JP2010/070138 JP2010070138W WO2012063351A1 WO 2012063351 A1 WO2012063351 A1 WO 2012063351A1 JP 2010070138 W JP2010070138 W JP 2010070138W WO 2012063351 A1 WO2012063351 A1 WO 2012063351A1
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Prior art keywords
resource
reference signal
signal
antennas
unit
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PCT/JP2010/070138
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French (fr)
Japanese (ja)
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筒井　正文
関　宏之
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富士通株式会社
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Priority to JP2012542770A priority Critical patent/JP5447689B2/en
Priority to PCT/JP2010/070138 priority patent/WO2012063351A1/en
Publication of WO2012063351A1 publication Critical patent/WO2012063351A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present invention relates to a wireless communication system, a transmitter, a receiver, a wireless communication method, a transmission method, and a reception method.
  • Orthogonal Frequency Division Multiple Access is adopted as a downlink (downlink) communication method.
  • a base station transmits a broadcast signal toward a wireless area using a predetermined resource.
  • This notification signal includes, for example, a synchronization signal, a reference signal (also referred to as RS: Reference Signal or pilot signal), notification information, and the like.
  • the reference signal is generally multiplexed with a data signal and transmitted.
  • a terminal such as a mobile station can demodulate data by performing channel estimation using the received reference signal. Also, the terminal uses the reference signal to measure reception quality for adaptive modulation and channel coding scheme (MCS) control, precoding matrix indicator (PMI) control in multiple-input multiple-output (MIMO) transmission, or adaptive scheduling. Can be done. PMI and reception quality information (CQI: Channel Quality Indicator) generated by the terminal are fed back to the base station.
  • MCS adaptive modulation and channel coding scheme
  • PMI precoding matrix indicator
  • MIMO multiple-input multiple-output
  • CQI Channel Quality Indicator
  • the reference signal is used for data demodulation or a level measurement of a received signal, an interference signal, or the like as a reference for the amplitude and phase of the signal.
  • the base station can perform diversity transmission. For example, the base station can realize high-speed transmission by transmitting a plurality of data streams from a plurality of antennas.
  • the terminal In order to receive a radio signal transmitted with diversity without error, the terminal needs to know the channel state from the antenna group used for transmission in the base station to the terminal. For this reason, each reference signal is required to be transmitted from each antenna of the base station without interference (with orthogonality). Therefore, the LTE wireless communication system transmits a reference signal from each antenna of the base station using different timings and carrier frequencies in the time domain and the frequency domain.
  • FIG. 1 is a diagram illustrating a reference signal transmission method assumed in LTE in a base station having four antennas (hereinafter simply referred to as a four-antenna base station).
  • the vertical axis (frequency domain) is in subcarrier units
  • the horizontal axis (time domain) is in OFDM symbol units.
  • R 1 , R 2 , R 3 and R 4 indicate reference signals corresponding to the first, second, third and fourth antennas, respectively. Further, for example, various data can be mapped to other symbols. Further, in FIG. 1, a unit of one block (12 subcarriers in the frequency domain and 14 OFDM symbols in the time domain) surrounded by a thick frame is called a resource block (RB). In the example shown in FIG. 1, N (N is a natural number) resource blocks are arranged in the vertical axis direction.
  • a unit of 1 subcarrier ⁇ 1 OFDM symbol constituting 1 RB is referred to as a resource element (RE).
  • the 4-antenna base station sets the transmission frequency of R 3 and R 4 transmitted from the third and fourth antennas to 1 to minimize the overhead for transmitting the reference signal.
  • the frequency is reduced compared to the transmission frequencies of R 1 and R 2 transmitted from the second and second antennas.
  • the reference signals R 1 to R 4 shown in FIG. 1 are common to all terminals (users) in a cell (radio area) covered by the base station, and are cell-specific reference signals (CRS: Cell-specific). It is called Reference Signal.
  • CRS Cell-specific reference signals
  • Reference Signal the number of antennas of the base station in LTE is four at the maximum, and the LTE-compliant terminal uses the reference signals R 1 to R 4 transmitted from the base station having a maximum of four antennas to demodulate data.
  • the quality of the downlink signal is measured.
  • the ratio of the reference signals R 1 to R 4 to the resource is about 14.3%, and in the case of a base station having two antennas, the reference to the resource
  • the ratio of the signals R 1 and R 2 is about 9.5%.
  • system design and various parameter settings tend to be performed such that the power ratio of the reference signal is about 10 to 15%.
  • LTE-A LTE-Advanced
  • a base station having eight antennas hereinafter simply referred to as an eight-antenna base station
  • the number of antennas in the base station may increase.
  • a specific method for mapping a reference signal to a resource in a base station having five or more antennas has not been proposed.
  • an object of the present invention is to provide an efficient method for mapping reference signals.
  • the present invention is not limited to the above-described object, and other effects of the present invention can be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the invention which will be described later. It can be positioned as one of
  • a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the radio signal
  • the transmitter maps the first reference signal corresponding to the first antenna among the plurality of antennas to the first resource and the second resource of the predetermined unit, respectively, and the second of the plurality of antennas.
  • a transmitter that transmits a radio signal generated by mapping the second reference signal corresponding to the antenna of the first resource to the first resource and not mapping to the second resource, and corresponding to the first resource A first receiver configured to receive the radio signal; and a first receiver that receives the first reference signal and the second reference signal included in the received radio signal, respectively.
  • a second processor corresponding to the second resource, a second receiver for receiving the radio signal, and the first receiver included in the received radio signal.
  • a wireless communication system including a second processing unit that receives and processes a reference signal can be used.
  • a transmitter including a transmitter that transmits a radio signal generated without mapping to the second resource can be used.
  • the transmitter In a receiver that receives a radio signal assigned and transmitted to a predetermined unit of resource in a transmitter having a plurality of antennas, the transmitter The first reference signal corresponding to the first antenna among the antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and a second corresponding to the second antenna among the plurality of antennas
  • a receiving unit configured to receive a radio signal generated by mapping a reference signal to the first resource and not mapped to the second resource; and the first reference signal and the second signal included in the received radio signal It is possible to use a receiver including a processing unit that receives and processes the reference signals.
  • a wireless communication system including a plurality of antennas, a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the radio signal.
  • the transmitter maps a first reference signal corresponding to a first antenna among the plurality of antennas to the first resource and the second resource of the predetermined unit, respectively.
  • a second reference signal corresponding to a second antenna among the plurality of antennas is mapped to the first resource and a radio signal generated without mapping to the second resource is transmitted, and the first reference signal is transmitted.
  • the first receiver corresponding to the resource receives the radio signal, and receives the first reference signal and the second reference signal included in the received radio signal, respectively.
  • the second receiver corresponding to the second resource uses a wireless communication method that receives the wireless signal and receives and processes the first reference signal included in the received wireless signal. it can.
  • a fifth proposal in a transmission method for transmitting a radio signal to which a user is assigned for each resource of a predetermined unit using a plurality of antennas, a first one corresponding to the first antenna among the plurality of antennas. 1 reference signal is mapped to each of the first resource and the second resource of the predetermined unit, and a second reference signal corresponding to a second antenna among the plurality of antennas is mapped to the first resource.
  • a transmission method of transmitting a radio signal generated without mapping to the second resource can be used.
  • a transmitter transmits a first signal among the plurality of antennas.
  • a first reference signal corresponding to one antenna is mapped to each of the first resource and the second resource of the predetermined unit, and a second reference signal corresponding to a second antenna among the plurality of antennas is
  • a radio signal generated by mapping to the first resource and not mapping to the second resource is received, and the first reference signal and the second reference signal included in the received radio signal are received.
  • a receiving method of processing can be used.
  • FIG. 2 shows an example of reference signal transmission in an 8-antenna base station.
  • reference signals R 5 to R 8 are mapped to resources in addition to the reference signals R 1 to R 4 shown in FIG. 1 in order to maintain compatibility with the 4-antenna base station.
  • the reference signals R 1 to R 8 are mapped so as to be dispersed on the resources as much as possible in consideration of changes in the communication environment.
  • transmission frequency of the reference signal R 5 ⁇ R 8 also, the reference signal R 3 and R 4 as well as transmission frequency, the reference signal R 1 and R 2 It is reduced compared to the transmission frequency.
  • FIG. 3 a reference signal transmission example in a base station having 16 antennas (hereinafter simply referred to as a 16 antenna base station) is shown in FIG.
  • a 16 antenna base station in order to maintain compatibility with the 4-antenna base station and the 8-antenna base station, reference signals R 9 to R 16 are mapped to resources in addition to the reference signals R 1 to R 8 shown in FIG. Has been.
  • the reference signals R 1 to R 16 are mapped so as to be dispersed on the resources as much as possible in consideration of changes in the communication environment.
  • transmission frequency of the reference signal R 9 ⁇ R 16 similarly to the transmission frequency of the reference signal R 3 ⁇ R 8
  • the reference signal R 1 and R 2 It is reduced compared to the transmission frequency.
  • the reference signal is occupied by the resources. The ratio is larger than the example shown in FIG.
  • the ratio of the reference signals R 1 to R 8 to the resources is about 23.8%, and in the example shown in FIG. 3, the reference signals R 1 to R 16 for the resources. Will account for about 42.9%.
  • the transmission power of the reference signal and the resources allocated to the reference signal increase, and the transmission efficiency of user data may decrease.
  • the reference signal may be transmitted only to some terminals (users). For example, when precoding is performed using five or more antennas, it is unlikely that precoding is performed in all terminals (users), and reference signals corresponding to five or more antennas are equipped with a corresponding number of antennas. It is often requested only by some high-end terminals (users).
  • a reference signal addressed to a part of terminals (users) (also referred to as an orthogonal pilot between user individual antennas) Mapping).
  • reference signals R 1 to R 4 are mapped to RB # 1 to RB # N
  • reference signals R 5 to R 8 are mapped to RB # 2
  • the others RB # 1, RB # 3 to RB # N are not mapped.
  • reference signals R 1 to R 4 are mapped to RB # 1 to RB # N
  • reference signals R 5 to R 16 are mapped to RB # 2
  • the others RB # 1, RB # 3 to RB # N are not mapped.
  • the ratio of the reference signals R 1 to R 8 to the resources is about 14.7%, which is 1/20 of all resources.
  • the ratio of the reference signals R 1 to R 16 to the resources is about 15.7%, and the increase in the resource occupancy when the antenna is increased can be significantly suppressed. it can.
  • FIG. 6 is a diagram illustrating an example of a configuration of a radio communication system according to an embodiment.
  • the wireless communication system 10 shown in FIG. 6 includes, for example, a base station 20, a terminal (UE: User Equipment) 30, and terminals (UE) 40-1 and 40-2.
  • UE User Equipment
  • UE terminals
  • the terminals 40-1 and 40-2 are not distinguished from each other, they are simply expressed as the terminal 40.
  • the number of base stations 20, terminals 30, and terminals 40 is not limited to the number illustrated in FIG.
  • the terminals 30 and 40 can be moved by a user, and in this sense, are synonymous with a wireless mobile terminal or a mobile station (MS).
  • MS wireless mobile terminal or a mobile station
  • the base station 20 provides a radio area 50 composed of cells, sectors, and the like.
  • the base station 20 can wirelessly communicate with the terminals 30 and 40 located in the wireless area 50 provided by the own station 20.
  • the base station 20 includes a plurality of antennas and functions as an example of a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource.
  • the terminals 30 and 40 can wirelessly communicate with the base station 20 that provides the wireless area 50 to which the stations 30 and 40 belong. That is, the terminals 30 and 40 have a function of receiving a radio signal from the base station 20 as a transmitter.
  • the base station 20 assigns a first resource (for example, RB # 2) allocated to the terminal 30 to the first antenna corresponding to the first antenna among the plurality of antennas.
  • reference signals R 1 to R 4 and second reference signals R 5 to R 8 (or R 5 to R 16 ) corresponding to a second antenna among the plurality of antennas are mapped and assigned to terminal 40
  • the first reference signals R 1 to R 4 are mapped to the second resources (for example, RB # 1, RB # 3 to RB # N) and the second reference signals R 5 to R 8 (or R 5 to A radio signal is generated and transmitted without mapping R 16 ).
  • the terminal 30 as the first receiver corresponding to the first resource receives the radio signal from the base station 20, and the first reference signals R 1 to R 4 included in the received radio signal and The second reference signals R 5 to R 8 (or R 5 to R 16 ) are received and processed, respectively. Further, the terminal 40 as the second receiver corresponding to the second resource receives the radio signal from the base station 20, and receives the first reference signals R 1 to R 4 included in the received radio signal. Receive processing.
  • FIG. 7 is a diagram illustrating a configuration example of the base station 20 according to an embodiment.
  • the base station 20 shown in FIG. 7 includes, for example, a processing unit 21 and a transmission / reception unit 22.
  • the processing unit 21 generates a radio signal in which a user is assigned to each predetermined unit resource such as a resource block (RB).
  • the processing unit 21 exemplarily includes a user data generation unit 211, a first reference signal generation unit 212, a first control signal generation unit 213, a second reference signal generation unit 214, and a second control signal.
  • a generation unit 215, a resource mapping unit 216, and a control unit 217 are provided.
  • the user data generation unit 211 generates user data addressed to the terminals 30 and 40.
  • the user data generated by the user data generation unit 211 is sent to the resource mapping unit 216.
  • the first reference signal generation unit 212 generates first reference signals R 1 to R 4 corresponding to the first antenna (for example, the antennas 222-1 to 222-4) among the plurality of antennas 222.
  • the first reference signals R 1 to R 4 generated by the first reference signal generation unit 212 are sent to the resource mapping unit 216.
  • the first control signal generation unit 213 generates a first control signal related to the mapping of the first reference signals R 1 to R 4 generated by the first reference signal generation unit 212.
  • the first control signal generated by the first control signal generation unit 213 is sent to the resource mapping unit 216.
  • the second reference signal generation unit 214 generates first reference signals R 5 to R n corresponding to the second antenna (for example, the antennas 222-5 to 222-n) among the plurality of antennas 222. Second reference signals R 5 to R n generated by second reference signal generation section 214 are sent to resource mapping section 216.
  • the second control signal generation unit 215 generates a second control signal related to the mapping of the second reference signals R 5 to R n generated by the second reference signal generation unit 214.
  • the second control signal generated by the second control signal generation unit 215 is sent to the resource mapping unit 216.
  • the resource mapping unit 216 uses the user data, the first reference signal, the second reference signal, the first control signal, and the second control signal as instructions (for example, scheduling information) from the control unit 217. Based on the mapping to the resource.
  • the resource may be composed of time and frequency as illustrated in FIGS. 1 to 5, or may be composed of at least one of code, time, power, frequency, and the like.
  • the resource mapping unit 216 may multiplex signals addressed to the terminals 30 and 40.
  • the control unit 217 determines the user data, the first reference signal, the second reference signal, the first reference signal based on the terminal management information about the terminals 30 and 40 located in the radio area 50 provided by the base station 20. Control the mapping of control signals and second control signals to resources.
  • the control unit 217 outputs the first reference signals R 1 to R 4 corresponding to the first antenna (for example, the antennas 222-1 to 222-4) to the first resource (for example, RB # 2) in a predetermined unit. ) And second resources (for example, RB # 1, RB # 3 to RB # N). Further, the control unit 217 maps the second reference signals R 5 to R n corresponding to the second antenna (eg, antennas 222-5 to 222-n) to the first resource (eg, RB # 2). However, it is not mapped to the second resource (for example, RB # 1, RB # 3 to RB # N).
  • control unit 217 may perform various processes such as a precoding process or a beamforming process based on information fed back from the terminals 30 and 40. That is, the processing unit 21 can function as an example of a third processing unit that performs precoding processing or beamforming processing based on the result of channel estimation received from the terminal 30.
  • the transmission / reception unit 22 transmits, for example, the radio signal generated by the processing unit 21. Therefore, for example, the transmission / reception unit 22 includes a wireless processing unit 221 and a plurality of antennas 222-1, 222-2,..., 222-n (n is an integer of 2 or more). In the following description, the antennas 222-1, 222-2,...
  • the radio processing unit 221 uses the resource mapping unit 216 to convert the user data, the first reference signal, the second reference signal, the first control signal, and the second control signal to digital / Wireless transmission processing such as analog conversion and up-conversion is performed.
  • the signal subjected to the wireless transmission process by the wireless processing unit 221 is transmitted to the antenna 222.
  • the wireless processing unit 221 can perform wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the terminal 30 via the antenna 222.
  • the signal subjected to the wireless reception process by the wireless processing unit 221 is sent to the control unit 217.
  • the antenna 222 transmits a radio signal subjected to predetermined radio processing by the radio processing unit 221 to the terminals 30 and 40.
  • the antenna 222 can receive radio signals transmitted from the terminals 30 and 40.
  • a radio signal received by the antenna 222 is sent to the radio processing unit 221. That is, the transmission / reception unit 22 can function as an example of a third reception unit that receives the result of the channel estimation result.
  • the transmitting / receiving unit 22 transmits the first reference signals R 1 to R 4 corresponding to the first antennas (for example, the antennas 222-1 to 222-4) to the first resource (for example, RB # 2) in a predetermined unit. ) And second resources (for example, RB # 1, RB # 3 to RB # N), respectively, and second reference signals corresponding to the second antennas (for example, antennas 222-5 to 222-n) Radio signals generated without mapping R 5 to R n to a first resource (for example, RB # 2) and not to a second resource (for example, RB # 1, RB # 3 to RB # N) It functions as an example of a transmission unit for transmission.
  • FIG. 8 is a diagram illustrating an example of the configuration of the terminal 30 according to an embodiment.
  • the terminal 30 shown in FIG. 8 functions as an example of a first receiver corresponding to the first resource, and illustratively includes a transmission / reception unit 31 and a processing unit 32.
  • the transmission / reception unit (first reception unit) 31 receives, for example, a radio signal from the base station 20. Therefore, for example, the transmission / reception unit 31 includes a plurality of antennas 311-1, 311-2,..., 311-m (m is an integer of 2 or more) and a wireless processing unit 312. In the following description, the antennas 311-1, 311-2,...
  • the antenna 311 receives a radio signal transmitted from the base station 20.
  • a radio signal received by the antenna 311 is sent to the radio processing unit 312.
  • the antenna 311 can also transmit a radio signal subjected to predetermined radio processing by the radio processing unit 312 to the base station 20.
  • the wireless processing unit 312 performs wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the base station 20 via the antenna 311.
  • the signal subjected to the wireless reception processing by the wireless processing unit 312 is sent to the resource demapping unit 321.
  • the radio processing unit 312 can also perform radio transmission processing such as digital / analog conversion and up-conversion on the channel estimation result generated by the channel estimation unit 325 described later.
  • the signal subjected to the wireless transmission processing by the wireless processing unit 312 is transmitted to the antenna 311.
  • the processing unit 32 extracts user data from the radio signal received by the transmission / reception unit 31.
  • the processing unit 32 includes a resource demapping unit 321, a control signal extraction unit 322, a first reference signal extraction unit 323, a second reference signal extraction unit 324, a channel estimation unit 325, A user data extraction unit 326 is provided.
  • the control signal extraction unit 322 extracts the first control signal and the second control signal from the signal received from the base station 20.
  • the control signal extraction unit 322 extracts the first control signal and the second control signal based on known information regarding the positions of the first control signal and the second control signal in the received signal. Can do.
  • the resource demapping unit 321 separates the signal received from the base station 20 based on the first control signal and the second control signal extracted by the control signal extraction unit 322.
  • the first reference signal extraction unit 323 extracts the first reference signal from the signal separated by the resource demapping unit 321 based on the first control signal extracted by the control signal extraction unit 322, and performs predetermined reception Apply processing.
  • the second reference signal extraction unit 324 extracts a second reference signal from the signal separated by the resource demapping unit 321 based on the second control signal extracted by the control signal extraction unit 322, and performs predetermined reception. Apply processing. That is, the processing unit 32 functions as an example of a first processing unit that receives and processes the first reference signal and the second reference signal included in the received wireless signal.
  • the channel estimation unit 325 performs channel estimation processing based on the first reference signal and the second reference signal extracted by the first reference signal extraction unit 323 and the second reference signal extraction unit 324. Further, the channel estimation unit 325 may feed back the channel estimation result to the base station 20 via the transmission / reception unit 31.
  • the user data extraction unit 326 extracts user data from the signal separated by the resource demapping unit 321 based on the channel estimation result generated by the channel estimation unit 325, and performs predetermined reception processing.
  • FIG. 9 is a diagram illustrating an exemplary configuration of the terminal 40 according to an embodiment.
  • the terminal 40 illustrated in FIG. 9 functions as an example of a second receiver corresponding to the second resource, and illustratively includes a transmission / reception unit 41 and a processing unit 42.
  • the transmitting / receiving unit (second receiving unit) 41 receives, for example, a radio signal from the base station 20.
  • the transmission / reception unit 41 exemplarily includes an antenna 411 and a wireless processing unit 412.
  • the antenna 411 receives a radio signal transmitted from the base station 20.
  • a radio signal received by the antenna 411 is sent to the radio processing unit 412.
  • the antenna 411 can also transmit a radio signal subjected to predetermined radio processing by the radio processing unit 412 to the base station 20.
  • the wireless processing unit 412 performs wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the base station 20 via the antenna 411.
  • the signal subjected to the wireless reception process by the wireless processing unit 412 is sent to the resource demapping unit 421.
  • the radio processing unit 412 can also perform radio transmission processing such as digital / analog conversion and up-conversion on the channel estimation result generated by the channel estimation unit 424 described later.
  • the signal subjected to the wireless transmission process by the wireless processing unit 412 is transmitted to the antenna 411.
  • the processing unit 42 extracts user data from the radio signal received by the transmission / reception unit 41. Therefore, for example, the processing unit 42 includes a resource demapping unit 421, a control signal extraction unit 422, a first reference signal extraction unit 423, a channel estimation unit 424, and a user data extraction unit 425.
  • the control signal extraction unit 422 extracts a first control signal from the signal received from the base station 20.
  • the control signal extraction unit 422 can extract the first control signal based on, for example, known information regarding the position of the first control signal in the received signal.
  • the resource demapping unit 421 separates the signal received from the base station 20 based on the first control signal extracted by the control signal extraction unit 422.
  • the first reference signal extraction unit 423 extracts the first reference signal from the signal separated by the resource demapping unit 421 based on the first control signal extracted by the control signal extraction unit 422, and performs predetermined reception. Apply processing.
  • the processing unit 42 functions as an example of a second processing unit that receives and processes the first reference signal included in the received radio signal. Further, the channel estimation unit 424 performs channel estimation processing based on the first reference signal extracted by the first reference signal extraction unit 423. Further, the channel estimation unit 424 may feed back the channel estimation result to the base station 20 via the transmission / reception unit 41.
  • the user data extraction unit 425 extracts user data from the signal separated by the resource demapping unit 421 based on the channel estimation result generated by the channel estimation unit 424, and performs a predetermined reception process. As described above, according to this example, even if the number of antennas 222 of the base station 20 increases, the resource occupancy rate of the reference signal corresponding to the antennas 222 can be significantly suppressed.
  • the present embodiment has been described by taking the case where the number n of the antennas 222 of the base station 20 is 8 or 16, but this is only an example, and the number of antennas of the base station 20 is It may be 5 or more. Needless to say, the present invention can also be applied to a base station 20 having four or fewer antennas.

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Abstract

A transmitter that is provided with a plurality of antennas and transmits a wireless signal, to which users are allocated per resource of a prescribed size, transmits a wireless signal generated with: a first reference signal (R1-R4) that corresponds to a first antenna, which is one of the aforementioned plurality of antennas, mapped to both a first resource (RB#2) of the aforementioned prescribed size and a second resource (RB#1, RB#3-RB#N); and a second reference signal (R5-R8) that corresponds to a second antenna, which is another of the aforementioned plurality of antennas, mapped to the first resource (RB#2) but not mapped to the second resource (RB#1, RB#3-RB#N).

Description

無線通信システム、送信機、受信機、無線通信方法、送信方法及び受信方法Wireless communication system, transmitter, receiver, wireless communication method, transmission method, and reception method
　本発明は、無線通信システム、送信機、受信機、無線通信方法、送信方法及び受信方法に関する。 The present invention relates to a wireless communication system, a transmitter, a receiver, a wireless communication method, a transmission method, and a reception method.
　3rd Generation Partnership Project（３ＧＰＰ）によって標準化が進められているLong Term Evolution（ＬＴＥ）では、下り回線（ダウンリンク）の通信方式としてOrthogonal Frequency Division Multiple Access（ＯＦＤＭＡ）が採用されている。
　ＬＴＥ方式の無線通信システムでは、基地局が、所定のリソースを用いて、報知信号を無線エリアに向けて送信する。この報知信号には、例えば、同期信号、参照信号（ＲＳ:Reference Signal、あるいはパイロット信号ともいう）、報知情報などが含まれる。 In Long Term Evolution (LTE), which is being standardized by the 3rd Generation Partnership Project (3GPP), Orthogonal Frequency Division Multiple Access (OFDMA) is adopted as a downlink (downlink) communication method.
In an LTE wireless communication system, a base station transmits a broadcast signal toward a wireless area using a predetermined resource. This notification signal includes, for example, a synchronization signal, a reference signal (also referred to as RS: Reference Signal or pilot signal), notification information, and the like.
　参照信号は、一般に、データ信号に多重されて送信される。移動局などの端末は、受信した参照信号を用いて、チャネル推定を行なってデータを復調することができる。
　また、端末は、参照信号を用いて適応Modulation and channel Coding Scheme（ＭＣＳ）制御、Multiple-Input Multiple-Output（ＭＩＭＯ）伝送におけるPrecoding Matrix Indicator（ＰＭＩ）制御または適応スケジューリングのための受信品質の測定を行なうことができる。端末により生成されたＰＭＩ及び受信品質情報（ＣＱＩ：Channel Quality Indicator）は基地局へフィードバックされる。 The reference signal is generally multiplexed with a data signal and transmitted. A terminal such as a mobile station can demodulate data by performing channel estimation using the received reference signal.
Also, the terminal uses the reference signal to measure reception quality for adaptive modulation and channel coding scheme (MCS) control, precoding matrix indicator (PMI) control in multiple-input multiple-output (MIMO) transmission, or adaptive scheduling. Can be done. PMI and reception quality information (CQI: Channel Quality Indicator) generated by the terminal are fed back to the base station.
　このように、参照信号は、信号の振幅及び位相の基準として、データの復調に用いられたり、受信信号や干渉信号等のレベル測定に用いられたりする。
　また、基地局が複数のアンテナを有する場合、基地局はダイバーシチ送信を行なうことができる。例えば、基地局は、複数のアンテナから複数のデータストリームを送信することにより、高速伝送を実現することが可能となる。 As described above, the reference signal is used for data demodulation or a level measurement of a received signal, an interference signal, or the like as a reference for the amplitude and phase of the signal.
Further, when the base station has a plurality of antennas, the base station can perform diversity transmission. For example, the base station can realize high-speed transmission by transmitting a plurality of data streams from a plurality of antennas.
　ダイバーシチ送信された無線信号を誤りなく受信するため、端末は、基地局での送信に用いられたアンテナ群から端末までのチャネル状態を知る必要がある。このため、各参照信号は、基地局の各アンテナから互いに干渉なく送信される（直交性がある）ことが要求される。
　そこで、ＬＴＥ方式の無線通信システムは、基地局の各アンテナから、時間領域及び周波数領域で互いに異なるタイミング及びキャリア周波数を用いて参照信号を送信する。 In order to receive a radio signal transmitted with diversity without error, the terminal needs to know the channel state from the antenna group used for transmission in the base station to the terminal. For this reason, each reference signal is required to be transmitted from each antenna of the base station without interference (with orthogonality).
Therefore, the LTE wireless communication system transmits a reference signal from each antenna of the base station using different timings and carrier frequencies in the time domain and the frequency domain.
　なお、参照信号に関する既存の技術として、例えば、未使用サブキャリアの電力を考慮して、ビームフォーミングを適用するリソースブロックに対するデータ信号及び参照信号の配置及び電力の調整を行なう方法がある（下記特許文献１）。 In addition, as an existing technique related to a reference signal, for example, there is a method of adjusting the arrangement and power of a data signal and a reference signal for a resource block to which beamforming is applied in consideration of power of unused subcarriers (see the following patents). Reference 1).
特開２０１０－４１４７３号公報JP 2010-41473 A
　複数のアンテナを備えた基地局は、所定単位のリソース毎にユーザを割り当てた無線信号を端末宛に送信する。ここで、複数のアンテナにそれぞれ対応する参照信号は、例えば、図１に示すようにリソースにマッピング（配置）される。図１は、ＬＴＥで想定されている、４基のアンテナを有する基地局（以下、単に４アンテナ基地局という）における参照信号の送信方法を示す図である。ただし、図１において、縦軸（周波数領域）はサブキャリア単位であり、横軸（時間領域）はＯＦＤＭシンボル単位である。 A base station equipped with a plurality of antennas transmits a radio signal to which a user is assigned for each resource of a predetermined unit to the terminal. Here, reference signals respectively corresponding to a plurality of antennas are mapped (arranged) to resources as shown in FIG. FIG. 1 is a diagram illustrating a reference signal transmission method assumed in LTE in a base station having four antennas (hereinafter simply referred to as a four-antenna base station). In FIG. 1, the vertical axis (frequency domain) is in subcarrier units, and the horizontal axis (time domain) is in OFDM symbol units.
　図１において、Ｒ１，Ｒ２，Ｒ３，Ｒ４は、それぞれ１番目，２番目，３番目，４番目のアンテナに対応する参照信号を示している。また、その他のシンボルには、例えば、各種データがマッピングされ得る。
　さらに、図１において、太線の枠で囲まれた１つのブロック（周波数領域で１２サブキャリア、時間領域で１４ＯＦＤＭシンボル）の単位をリソースブロック（ＲＢ：Resource Block）と呼ぶ。なお、図１に示す例では、Ｎ（Ｎは自然数）個のリソースブロックが縦軸方向に並んで配置されている。 In FIG. 1, R 1 , R 2 , R 3 and R 4 indicate reference signals corresponding to the first, second, third and fourth antennas, respectively. Further, for example, various data can be mapped to other symbols.
Further, in FIG. 1, a unit of one block (12 subcarriers in the frequency domain and 14 OFDM symbols in the time domain) surrounded by a thick frame is called a resource block (RB). In the example shown in FIG. 1, N (N is a natural number) resource blocks are arranged in the vertical axis direction.
　また、１ＲＢを構成する１サブキャリア×１ＯＦＤＭシンボルの単位をリソースエレメント（ＲＥ：Resource Element）と呼ぶ。
　この図１から分かるように、４アンテナ基地局は、参照信号の送信にかかるオーバーヘッドを最小限に抑えるため、３番目及び４番目のアンテナから送信されるＲ３及びＲ４の送信頻度を、１番目及び２番目のアンテナから送信されるＲ１及びＲ２の送信頻度に比して減少させている。 A unit of 1 subcarrier × 1 OFDM symbol constituting 1 RB is referred to as a resource element (RE).
As can be seen from FIG. 1, the 4-antenna base station sets the transmission frequency of R 3 and R 4 transmitted from the third and fourth antennas to 1 to minimize the overhead for transmitting the reference signal. The frequency is reduced compared to the transmission frequencies of R 1 and R 2 transmitted from the second and second antennas.
　なお、図１に示す参照信号Ｒ１～Ｒ４は、基地局がカバーするセル（無線エリア）内のすべての端末（ユーザ）に対して共通であり、セル固有参照信号（ＣＲＳ：Cell-specific Reference Signal）と呼ばれる。
　このように、ＬＴＥにおける基地局のアンテナ数は最大４基であり、ＬＴＥ準拠の端末は、最大４つのアンテナを有する基地局から送信された参照信号Ｒ１～Ｒ４を用いて、データの復調および下り信号の品質測定を行なう。 Note that the reference signals R 1 to R 4 shown in FIG. 1 are common to all terminals (users) in a cell (radio area) covered by the base station, and are cell-specific reference signals (CRS: Cell-specific). It is called Reference Signal.
In this way, the number of antennas of the base station in LTE is four at the maximum, and the LTE-compliant terminal uses the reference signals R 1 to R 4 transmitted from the base station having a maximum of four antennas to demodulate data. In addition, the quality of the downlink signal is measured.
　ところで、図１に示す例では、リソースに対して参照信号Ｒ１～Ｒ４が占める割合は約１４．３％であり、また、２基のアンテナを有する基地局の場合、リソースに対して参照信号Ｒ１及びＲ２が占める割合は約９．５％となる。
　移動通信システムなどの無線通信システムでは、参照信号の電力比率が、約１０～１５％となるように、システム設計や各種のパラメータ設定がなされる傾向にある。 By the way, in the example shown in FIG. 1, the ratio of the reference signals R 1 to R 4 to the resource is about 14.3%, and in the case of a base station having two antennas, the reference to the resource The ratio of the signals R 1 and R 2 is about 9.5%.
In a wireless communication system such as a mobile communication system, system design and various parameter settings tend to be performed such that the power ratio of the reference signal is about 10 to 15%.
　一方、ＬＴＥ－Ａ（LTE-Advanced）では、８基のアンテナを有する基地局（以下、単に８アンテナ基地局という）が検討されている。また、今後、基地局のアンテナ数が増加することが考えられる。
　しかしながら、５基以上のアンテナを有する基地局において、参照信号をどのようにリソースにマッピングするかについて、具体的な方法は提案されていない。 On the other hand, in LTE-A (LTE-Advanced), a base station having eight antennas (hereinafter simply referred to as an eight-antenna base station) is being studied. In the future, the number of antennas in the base station may increase.
However, a specific method for mapping a reference signal to a resource in a base station having five or more antennas has not been proposed.
　そこで、本発明は、参照信号の効率的なマッピング方法を提供することを目的の１つとする。
　なお、前記目的に限らず、後述する発明を実施するための形態に示す各構成により導かれる作用効果であって、従来の技術によっては得られない作用効果を奏することも本発明の他の目的の一つとして位置付けることができる。 Accordingly, an object of the present invention is to provide an efficient method for mapping reference signals.
In addition, the present invention is not limited to the above-described object, and other effects of the present invention can be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the invention which will be described later. It can be positioned as one of
　（１）第１の案として、複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機と、該無線信号を受信する受信機とを有する無線通信システムにおいて、前記送信機は、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する送信部を備え、前記第１のリソースに対応する第１の受信機は、前記無線信号を受信する第１の受信部と、受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理する第１の処理部とを備え、前記第２のリソースに対応する第２の受信機は、前記無線信号を受信する第２の受信部と、受信した前記無線信号に含まれる前記第１の参照信号を受信処理する第２の処理部とを備えた、無線通信システムを用いることができる。 (1) As a first proposal, in a wireless communication system including a plurality of antennas, a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the radio signal, The transmitter maps the first reference signal corresponding to the first antenna among the plurality of antennas to the first resource and the second resource of the predetermined unit, respectively, and the second of the plurality of antennas. A transmitter that transmits a radio signal generated by mapping the second reference signal corresponding to the antenna of the first resource to the first resource and not mapping to the second resource, and corresponding to the first resource A first receiver configured to receive the radio signal; and a first receiver that receives the first reference signal and the second reference signal included in the received radio signal, respectively. A second processor corresponding to the second resource, a second receiver for receiving the radio signal, and the first receiver included in the received radio signal. A wireless communication system including a second processing unit that receives and processes a reference signal can be used.
　（２）また、第２の案として、複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機において、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する送信部を備えた、送信機を用いることができる。 (2) Further, as a second proposal, in a transmitter that includes a plurality of antennas and transmits a radio signal to which a user is assigned for each predetermined unit of resource, a first antenna corresponding to the first antenna among the plurality of antennas. 1 reference signal is mapped to each of the first resource and the second resource of the predetermined unit, and a second reference signal corresponding to a second antenna among the plurality of antennas is mapped to the first resource. A transmitter including a transmitter that transmits a radio signal generated without mapping to the second resource can be used.
　（３）さらに、第３の案として、複数のアンテナを備えた送信機において所定単位のリソース毎にユーザを割り当てられ送信された無線信号を受信する受信機において、前記送信機から、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を受信する受信部と、受信した前記無線信号に含まれる前記第１の参照信号及び第２の参照信号をそれぞれ受信処理する処理部とを備えた、受信機を用いることができる。 (3) Further, as a third proposal, in a receiver that receives a radio signal assigned and transmitted to a predetermined unit of resource in a transmitter having a plurality of antennas, the transmitter The first reference signal corresponding to the first antenna among the antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and a second corresponding to the second antenna among the plurality of antennas A receiving unit configured to receive a radio signal generated by mapping a reference signal to the first resource and not mapped to the second resource; and the first reference signal and the second signal included in the received radio signal It is possible to use a receiver including a processing unit that receives and processes the reference signals.
　（４）また、第４の案として、複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機と、該無線信号を受信する受信機とを有する無線通信システムに用いられる無線通信方法において、前記送信機は、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信し、前記第１のリソースに対応する第１の受信機は、前記無線信号を受信し、受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理し、前記第２のリソースに対応する第２の受信機は、前記無線信号を受信し、受信した前記無線信号に含まれる前記第１の参照信号を受信処理する、無線通信方法を用いることができる。 (4) As a fourth proposal, a wireless communication system including a plurality of antennas, a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the radio signal. In the wireless communication method used in the above, the transmitter maps a first reference signal corresponding to a first antenna among the plurality of antennas to the first resource and the second resource of the predetermined unit, respectively. A second reference signal corresponding to a second antenna among the plurality of antennas is mapped to the first resource and a radio signal generated without mapping to the second resource is transmitted, and the first reference signal is transmitted. The first receiver corresponding to the resource receives the radio signal, and receives the first reference signal and the second reference signal included in the received radio signal, respectively. Then, the second receiver corresponding to the second resource uses a wireless communication method that receives the wireless signal and receives and processes the first reference signal included in the received wireless signal. it can.
　（５）さらに、第５の案として、所定単位のリソース毎にユーザを割り当てた無線信号を複数のアンテナを用いて送信する送信方法において、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する、送信方法を用いることができる。 (5) Further, as a fifth proposal, in a transmission method for transmitting a radio signal to which a user is assigned for each resource of a predetermined unit using a plurality of antennas, a first one corresponding to the first antenna among the plurality of antennas. 1 reference signal is mapped to each of the first resource and the second resource of the predetermined unit, and a second reference signal corresponding to a second antenna among the plurality of antennas is mapped to the first resource. A transmission method of transmitting a radio signal generated without mapping to the second resource can be used.
　（６）また、第６の案として、所定単位のリソース毎にユーザを割り当てられ複数のアンテナを用いて送信された無線信号を受信する受信方法において、送信機から、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を受信し、受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理する、受信方法を用いることができる。 (6) Further, as a sixth proposal, in a receiving method for receiving a radio signal transmitted by using a plurality of antennas to which a user is assigned for each predetermined unit of resources, a transmitter transmits a first signal among the plurality of antennas. A first reference signal corresponding to one antenna is mapped to each of the first resource and the second resource of the predetermined unit, and a second reference signal corresponding to a second antenna among the plurality of antennas is A radio signal generated by mapping to the first resource and not mapping to the second resource is received, and the first reference signal and the second reference signal included in the received radio signal are received. A receiving method of processing can be used.
　参照信号を効率的にマッピングすることが可能となる。 It becomes possible to map the reference signal efficiently.
４アンテナ基地局における参照信号のマッピング例を示す図である。It is a figure which shows the example of a reference signal mapping in a 4 antenna base station. ８アンテナ基地局における参照信号のマッピング例を示す図である。It is a figure which shows the example of a mapping of the reference signal in 8 antenna base stations. １６アンテナ基地局における参照信号のマッピング例を示す図である。It is a figure which shows the example of a mapping of the reference signal in 16 antenna base stations. ８アンテナ基地局における参照信号のマッピング例を示す図である。It is a figure which shows the example of a mapping of the reference signal in 8 antenna base stations. １６アンテナ基地局における参照信号のマッピング例を示す図である。It is a figure which shows the example of a mapping of the reference signal in 16 antenna base stations. 本発明の一実施形態に係る無線通信システムの一例を示す図である。It is a figure which shows an example of the radio | wireless communications system which concerns on one Embodiment of this invention. 図６に示す基地局の構成の一例を示す図である。It is a figure which shows an example of a structure of the base station shown in FIG. 図６に示す端末の構成の一例を示す図である。It is a figure which shows an example of a structure of the terminal shown in FIG. 図６に示す端末の構成の一例を示す図である。It is a figure which shows an example of a structure of the terminal shown in FIG.
　以下、図面を参照して本発明の実施の形態を説明する。ただし、以下に示す実施の形態は、あくまでも例示に過ぎず、以下に示す実施形態で明示しない種々の変形や技術の適用を排除する意図はない。即ち、実施形態及び各変形例を、本発明の趣旨を逸脱しない範囲で種々変形して実施できることはいうまでもない。
　〔１〕一実施形態の説明
　（１．１）基地局における参照信号の送信例
　基地局のアンテナ数が増加すると、セル固有参照信号（ＣＲＳ）数も増加する。 Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the embodiment described below. That is, it goes without saying that the embodiment and each modified example can be variously modified without departing from the spirit of the present invention.
[1] Description of Embodiment (1.1) Reference Signal Transmission Example in Base Station As the number of antennas in the base station increases, the number of cell-specific reference signals (CRS) also increases.
　例えば、８アンテナ基地局における参照信号の送信例について図２に示す。
　この図２に示す例では、４アンテナ基地局と互換性を維持すべく、図１に示す参照信号Ｒ１～Ｒ４に加えて参照信号Ｒ５～Ｒ８がリソースにマッピングされている。
　また、参照信号Ｒ１～Ｒ８は、通信環境の変化を考慮し、なるべくリソース上にばらばらになるようにマッピングされている。なお、参照信号の送信にかかるオーバーヘッドを最小限に抑えるため、参照信号Ｒ５～Ｒ８の送信頻度も、参照信号Ｒ３及びＲ４の送信頻度と同様に、参照信号Ｒ１及びＲ２の送信頻度に比して減少させている。 For example, FIG. 2 shows an example of reference signal transmission in an 8-antenna base station.
In the example shown in FIG. 2, reference signals R 5 to R 8 are mapped to resources in addition to the reference signals R 1 to R 4 shown in FIG. 1 in order to maintain compatibility with the 4-antenna base station.
Further, the reference signals R 1 to R 8 are mapped so as to be dispersed on the resources as much as possible in consideration of changes in the communication environment. Incidentally, in order to suppress such the transmission of the reference signal overhead to a minimum, transmission frequency of the reference signal R 5 ~ R 8 also, the reference signal R 3 and R 4 as well as transmission frequency, the reference signal R 1 and R 2 It is reduced compared to the transmission frequency.
　さらに、例えば、１６基のアンテナを有する基地局（以下、単に１６アンテナ基地局という）における参照信号の送信例について図３に示す。
　この図３に示す例では、４アンテナ基地局及び８アンテナ基地局と互換性を維持すべく、図２に示す参照信号Ｒ１～Ｒ８に加えて参照信号Ｒ９～Ｒ１６がリソースにマッピングされている。 Furthermore, for example, a reference signal transmission example in a base station having 16 antennas (hereinafter simply referred to as a 16 antenna base station) is shown in FIG.
In the example shown in FIG. 3, in order to maintain compatibility with the 4-antenna base station and the 8-antenna base station, reference signals R 9 to R 16 are mapped to resources in addition to the reference signals R 1 to R 8 shown in FIG. Has been.
　また、参照信号Ｒ１～Ｒ１６は、通信環境の変化を考慮し、なるべくリソース上にばらばらになるようにマッピングされている。なお、参照信号の送信にかかるオーバーヘッドを最小限に抑えるため、参照信号Ｒ９～Ｒ１６の送信頻度も、参照信号Ｒ３～Ｒ８の送信頻度と同様に、参照信号Ｒ１及びＲ２の送信頻度に比して減少させている。
　しかしながら、図２及び図３に示す例では、図１に示す例においてデータに割当てていたリソースを参照信号Ｒ５～Ｒ８及びＲ９～Ｒ１６に割当てているので、リソースに対する参照信号の占有比率が図１に示す例に比して大きくなっている。 Further, the reference signals R 1 to R 16 are mapped so as to be dispersed on the resources as much as possible in consideration of changes in the communication environment. Incidentally, in order to suppress such the transmission of the reference signal overhead to a minimum, transmission frequency of the reference signal R 9 ~ R 16, similarly to the transmission frequency of the reference signal R 3 ~ R 8, the reference signal R 1 and R 2 It is reduced compared to the transmission frequency.
However, in the examples shown in FIGS. 2 and 3, since the resources allocated to the data in the example shown in FIG. 1 are allocated to the reference signals R 5 to R 8 and R 9 to R 16 , the reference signal is occupied by the resources. The ratio is larger than the example shown in FIG.
　図２に示す例では、リソースに対して参照信号Ｒ１～Ｒ８が占める割合は約２３．８％であり、また、図３に示す例では、リソースに対して参照信号Ｒ１～Ｒ１６が占める割合は約４２．９％にもなる。
　以上のように、基地局のアンテナ数が増加すると、参照信号の送信電力や、参照信号に割り当てられるリソースが増加し、ユーザデータの送信効率が低下することがある。 In the example shown in FIG. 2, the ratio of the reference signals R 1 to R 8 to the resources is about 23.8%, and in the example shown in FIG. 3, the reference signals R 1 to R 16 for the resources. Will account for about 42.9%.
As described above, when the number of antennas of the base station increases, the transmission power of the reference signal and the resources allocated to the reference signal increase, and the transmission efficiency of user data may decrease.
　ところで、参照信号は、一部の端末（ユーザ）のみに送信されてもよい。
　例えば、５以上のアンテナを用いてプリコーディングを行なう場合、全端末（ユーザ）でプリコーディングが実施されることは考えにくく、５以上のアンテナに対応する参照信号は、対応する数のアンテナを搭載したハイエンドな一部の端末（ユーザ）のみで要求されることが多い。 By the way, the reference signal may be transmitted only to some terminals (users).
For example, when precoding is performed using five or more antennas, it is unlikely that precoding is performed in all terminals (users), and reference signals corresponding to five or more antennas are equipped with a corresponding number of antennas. It is often requested only by some high-end terminals (users).
　そこで、本例では、所定単位のリソース毎にユーザが割り当てられた無線信号において、前記所定単位のリソースの一部に、一部の端末（ユーザ）宛の参照信号（ユーザ個別アンテナ間直交パイロットともいう）をマッピングする。
　例えば、８アンテナ基地局の場合、図４に示すように、参照信号Ｒ１～Ｒ４をＲＢ＃１～ＲＢ＃Ｎにマッピングし、参照信号Ｒ５～Ｒ８をＲＢ＃２にマッピングしその他のＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎにはマッピングしない。 Therefore, in this example, in a radio signal in which a user is assigned for each resource of a predetermined unit, a reference signal addressed to a part of terminals (users) (also referred to as an orthogonal pilot between user individual antennas) Mapping).
For example, in the case of an 8-antenna base station, as shown in FIG. 4, reference signals R 1 to R 4 are mapped to RB # 1 to RB # N, reference signals R 5 to R 8 are mapped to RB # 2, and the others RB # 1, RB # 3 to RB # N are not mapped.
　例えば、１６アンテナ基地局の場合、図５に示すように、参照信号Ｒ１～Ｒ４をＲＢ＃１～ＲＢ＃Ｎにマッピングし、参照信号Ｒ５～Ｒ１６をＲＢ＃２にマッピングしその他のＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎにはマッピングしない。
　これにより、基地局のアンテナ数が増加しても、リソースにおける参照信号の占有比率の増加を抑えることが可能となる。 For example, in the case of a 16 antenna base station, as shown in FIG. 5, reference signals R 1 to R 4 are mapped to RB # 1 to RB # N, reference signals R 5 to R 16 are mapped to RB # 2, and the others RB # 1, RB # 3 to RB # N are not mapped.
Thereby, even if the number of antennas of the base station increases, it is possible to suppress an increase in the occupation ratio of the reference signal in the resource.
　例えば、全リソースの１／２０に参照信号Ｒ５～Ｒ８をマッピングした場合、リソースに対して参照信号Ｒ１～Ｒ８が占める割合は約１４．７％となり、全リソースの１／２０に参照信号Ｒ５～Ｒ１６をマッピングした場合、リソースに対して参照信号Ｒ１～Ｒ１６が占める割合は約１５．７％となり、アンテナ増加時のリソース占有率の増加を大幅に抑制することができる。 For example, when the reference signals R 5 to R 8 are mapped to 1/20 of all resources, the ratio of the reference signals R 1 to R 8 to the resources is about 14.7%, which is 1/20 of all resources. When the reference signals R 5 to R 16 are mapped, the ratio of the reference signals R 1 to R 16 to the resources is about 15.7%, and the increase in the resource occupancy when the antenna is increased can be significantly suppressed. it can.
　（１．２）無線通信システムの構成例
　図６は一実施形態に係る無線通信システムの構成の一例を示す図である。
　この図６に示す無線通信システム１０は、例示的に、基地局２０と、端末（ＵＥ：User Equipment）３０と、端末（ＵＥ）４０－１，４０－２とをそなえる。なお、以下では、端末４０－１，４０－２を区別しない場合、単に端末４０と表記する。また、基地局２０，端末３０及び端末４０の数は、図６に例示する数に限定されない。さらに、例えば、端末３０及び４０はユーザによって移動可能で、その意味で、無線移動端末あるいは移動局（ＭＳ：Mobile Station）と同義である。 (1.2) Configuration Example of Radio Communication System FIG. 6 is a diagram illustrating an example of a configuration of a radio communication system according to an embodiment.
The wireless communication system 10 shown in FIG. 6 includes, for example, a base station 20, a terminal (UE: User Equipment) 30, and terminals (UE) 40-1 and 40-2. Hereinafter, when the terminals 40-1 and 40-2 are not distinguished from each other, they are simply expressed as the terminal 40. Further, the number of base stations 20, terminals 30, and terminals 40 is not limited to the number illustrated in FIG. Further, for example, the terminals 30 and 40 can be moved by a user, and in this sense, are synonymous with a wireless mobile terminal or a mobile station (MS).
　ここで、基地局２０は、セルやセクタなどで構成される無線エリア５０を提供する。例えば、基地局２０は、自局２０が提供する無線エリア５０内に位置する端末３０及び４０と無線通信することができる。
　また、基地局２０は、複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機の一例として機能する。 Here, the base station 20 provides a radio area 50 composed of cells, sectors, and the like. For example, the base station 20 can wirelessly communicate with the terminals 30 and 40 located in the wireless area 50 provided by the own station 20.
The base station 20 includes a plurality of antennas and functions as an example of a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource.
　一方、端末３０及び４０は、自局３０及び４０が属する無線エリア５０を提供する基地局２０と無線通信することができる。即ち、端末３０及び４０は、送信機としての基地局２０から無線信号を受信する機能を具備する。
　上記の無線通信システム１０において、本例では、基地局２０が、端末３０に割り当てられる第１のリソース（例えば、ＲＢ＃２）に、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号Ｒ１～Ｒ４及び前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号Ｒ５～Ｒ８（またはＲ５～Ｒ１６）をそれぞれマッピングするとともに、端末４０に割り当てられる第２のリソース（例えば、ＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎ）に、第１の参照信号Ｒ１～Ｒ４をマッピングし第２の参照信号Ｒ５～Ｒ８（またはＲ５～Ｒ１６）をマッピングしないで無線信号を生成し送信する。 On the other hand, the terminals 30 and 40 can wirelessly communicate with the base station 20 that provides the wireless area 50 to which the stations 30 and 40 belong. That is, the terminals 30 and 40 have a function of receiving a radio signal from the base station 20 as a transmitter.
In the wireless communication system 10 described above, in this example, the base station 20 assigns a first resource (for example, RB # 2) allocated to the terminal 30 to the first antenna corresponding to the first antenna among the plurality of antennas. Of reference signals R 1 to R 4 and second reference signals R 5 to R 8 (or R 5 to R 16 ) corresponding to a second antenna among the plurality of antennas are mapped and assigned to terminal 40 The first reference signals R 1 to R 4 are mapped to the second resources (for example, RB # 1, RB # 3 to RB # N) and the second reference signals R 5 to R 8 (or R 5 to A radio signal is generated and transmitted without mapping R 16 ).
　また、第１のリソースに対応する第１の受信機としての端末３０は、基地局２０からの無線信号を受信し、受信した前記無線信号に含まれる第１の参照信号Ｒ１～Ｒ４及び第２の参照信号Ｒ５～Ｒ８（またはＲ５～Ｒ１６）をそれぞれ受信処理する。
　さらに、第２のリソースに対応する第２の受信機としての端末４０は、基地局２０からの無線信号を受信し、受信した前記無線信号に含まれる第１の参照信号Ｒ１～Ｒ４を受信処理する。 Also, the terminal 30 as the first receiver corresponding to the first resource receives the radio signal from the base station 20, and the first reference signals R 1 to R 4 included in the received radio signal and The second reference signals R 5 to R 8 (or R 5 to R 16 ) are received and processed, respectively.
Further, the terminal 40 as the second receiver corresponding to the second resource receives the radio signal from the base station 20, and receives the first reference signals R 1 to R 4 included in the received radio signal. Receive processing.
　以下、基地局２０，端末３０及び４０の構成の一例について説明する。なお、以下に説明する基地局２０，端末３０及び４０の各構成は、あくまで一例であり、本発明は以下に示すような構成に限定されないのはいうまでもない。
　（１．３）基地局２０の構成例
　図７は一実施形態に係る基地局２０の構成の一例を示す図である。 Hereinafter, an example of the configuration of the base station 20 and the terminals 30 and 40 will be described. Note that the configurations of the base station 20 and the terminals 30 and 40 described below are merely examples, and it goes without saying that the present invention is not limited to the configurations shown below.
(1.3) Configuration Example of Base Station 20 FIG. 7 is a diagram illustrating a configuration example of the base station 20 according to an embodiment.
　この図７に示す基地局２０は、例示的に、処理部２１と、送受信部２２とをそなえる。
　処理部２１は、例えば、例えば、リソースブロック（ＲＢ）などの所定単位のリソース毎にユーザを割り当てた無線信号を生成する。
　このため、処理部２１は、例示的に、ユーザデータ生成部２１１と、第１参照信号生成部２１２と、第１制御信号生成部２１３と、第２参照信号生成部２１４と、第２制御信号生成部２１５と、リソースマッピング部２１６と、制御部２１７とをそなえる。 The base station 20 shown in FIG. 7 includes, for example, a processing unit 21 and a transmission / reception unit 22.
For example, the processing unit 21 generates a radio signal in which a user is assigned to each predetermined unit resource such as a resource block (RB).
For this reason, the processing unit 21 exemplarily includes a user data generation unit 211, a first reference signal generation unit 212, a first control signal generation unit 213, a second reference signal generation unit 214, and a second control signal. A generation unit 215, a resource mapping unit 216, and a control unit 217 are provided.
　ここで、ユーザデータ生成部２１１は、端末３０及び４０宛のユーザデータを生成する。ユーザデータ生成部２１１により生成されたユーザデータは、リソースマッピング部２１６へ送出される。
　また、第１参照信号生成部２１２は、複数のアンテナ２２２のうち第１のアンテナ（例えば、アンテナ２２２－１～２２２－４）に対応する第１の参照信号Ｒ１～Ｒ４を生成する。第１参照信号生成部２１２により生成された第１の参照信号Ｒ１～Ｒ４は、リソースマッピング部２１６へ送出される。 Here, the user data generation unit 211 generates user data addressed to the terminals 30 and 40. The user data generated by the user data generation unit 211 is sent to the resource mapping unit 216.
Further, the first reference signal generation unit 212 generates first reference signals R 1 to R 4 corresponding to the first antenna (for example, the antennas 222-1 to 222-4) among the plurality of antennas 222. The first reference signals R 1 to R 4 generated by the first reference signal generation unit 212 are sent to the resource mapping unit 216.
　さらに、第１制御信号生成部２１３は、第１参照信号生成部２１２により生成された第１の参照信号Ｒ１～Ｒ４のマッピングに関する第１の制御信号を生成する。第１制御信号生成部２１３により生成された第１の制御信号は、リソースマッピング部２１６へ送出される。
　また、第２参照信号生成部２１４は、複数のアンテナ２２２のうち第２のアンテナ（例えば、アンテナ２２２－５～２２２－ｎ）に対応する第１の参照信号Ｒ５～Ｒｎを生成する。第２参照信号生成部２１４により生成された第２の参照信号Ｒ５～Ｒｎは、リソースマッピング部２１６へ送出される。 Further, the first control signal generation unit 213 generates a first control signal related to the mapping of the first reference signals R 1 to R 4 generated by the first reference signal generation unit 212. The first control signal generated by the first control signal generation unit 213 is sent to the resource mapping unit 216.
Further, the second reference signal generation unit 214 generates first reference signals R 5 to R n corresponding to the second antenna (for example, the antennas 222-5 to 222-n) among the plurality of antennas 222. Second reference signals R 5 to R n generated by second reference signal generation section 214 are sent to resource mapping section 216.
　さらに、第２制御信号生成部２１５は、第２参照信号生成部２１４により生成された第２の参照信号Ｒ５～Ｒｎのマッピングに関する第２の制御信号を生成する。第２制御信号生成部２１５により生成された第２の制御信号は、リソースマッピング部２１６へ送出される。
　そして、リソースマッピング部２１６は、上記ユーザデータ，第１の参照信号，第２の参照信号，第１の制御信号及び第２の制御信号を、制御部２１７からの指示（例えば、スケジューリング情報）に基づいて、リソースにマッピングする。なお、前記リソースは、図１～図５に例示したように、時間及び周波数から構成されてもよいし、符号，時間，電力及び周波数などの少なくともいずれかから構成されてもよい。 Further, the second control signal generation unit 215 generates a second control signal related to the mapping of the second reference signals R 5 to R n generated by the second reference signal generation unit 214. The second control signal generated by the second control signal generation unit 215 is sent to the resource mapping unit 216.
Then, the resource mapping unit 216 uses the user data, the first reference signal, the second reference signal, the first control signal, and the second control signal as instructions (for example, scheduling information) from the control unit 217. Based on the mapping to the resource. Note that the resource may be composed of time and frequency as illustrated in FIGS. 1 to 5, or may be composed of at least one of code, time, power, frequency, and the like.
　また、リソースマッピング部２１６は、各端末３０及び４０宛の信号を多重してもよい。
　制御部２１７は、基地局２０が提供する無線エリア５０内に位置する端末３０及び４０についての端末管理情報などに基づき、上記ユーザデータ，第１の参照信号，第２の参照信号，第１の制御信号及び第２の制御信号のリソースへのマッピングを制御する。 Further, the resource mapping unit 216 may multiplex signals addressed to the terminals 30 and 40.
The control unit 217 determines the user data, the first reference signal, the second reference signal, the first reference signal based on the terminal management information about the terminals 30 and 40 located in the radio area 50 provided by the base station 20. Control the mapping of control signals and second control signals to resources.
　例えば、制御部２１７は、第１のアンテナ（例えば、アンテナ２２２－１～２２２－４）に対応する第１の参照信号Ｒ１～Ｒ４を所定単位の第１のリソース（例えば、ＲＢ＃２）及び第２のリソース（例えば、ＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎ）にそれぞれマッピングする。さらに、制御部２１７は、第２のアンテナ（例えば、アンテナ２２２－５～２２２－ｎ）に対応する第２の参照信号Ｒ５～Ｒｎを第１のリソース（例えば、ＲＢ＃２）にマッピングし第２のリソース（例えば、ＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎ）にはマッピングしない。 For example, the control unit 217 outputs the first reference signals R 1 to R 4 corresponding to the first antenna (for example, the antennas 222-1 to 222-4) to the first resource (for example, RB # 2) in a predetermined unit. ) And second resources (for example, RB # 1, RB # 3 to RB # N). Further, the control unit 217 maps the second reference signals R 5 to R n corresponding to the second antenna (eg, antennas 222-5 to 222-n) to the first resource (eg, RB # 2). However, it is not mapped to the second resource (for example, RB # 1, RB # 3 to RB # N).
　また、制御部２１７は、端末３０及び４０からフィードバックされる情報に基づいて、プリコーディング処理又はビームフォーミング処理などの各種の処理を行なってもよい。
　即ち、処理部２１は、端末３０から受信したチャネル推定結果の結果に基づいて、プリコーディング処理又はビームフォーミング処理を行なう第３の処理部の一例として機能し得る。 Further, the control unit 217 may perform various processes such as a precoding process or a beamforming process based on information fed back from the terminals 30 and 40.
That is, the processing unit 21 can function as an example of a third processing unit that performs precoding processing or beamforming processing based on the result of channel estimation received from the terminal 30.
　一方、送受信部２２は、例えば、処理部２１で生成された無線信号を送信する。
　このため、送受信部２２は、例示的に、無線処理部２２１と、複数のアンテナ２２２－１，２２２－２，・・・，２２２－ｎ（ｎは２以上の整数）とをそなえる。なお、以下では、アンテナ２２２－１，２２２－２，・・・，２２２－ｎを区別しない場合、単にアンテナ２２２と表記する。 On the other hand, the transmission / reception unit 22 transmits, for example, the radio signal generated by the processing unit 21.
Therefore, for example, the transmission / reception unit 22 includes a wireless processing unit 221 and a plurality of antennas 222-1, 222-2,..., 222-n (n is an integer of 2 or more). In the following description, the antennas 222-1, 222-2,...
　ここで、無線処理部２２１は、リソースマッピング部２１６によって上記ユーザデータ，第１の参照信号，第２の参照信号，第１の制御信号及び第２の制御信号がマッピングされた信号について、デジタル／アナログ変換及びアップコンバートなどの無線送信処理を施す。無線処理部２２１によって無線送信処理を施された信号は、アンテナ２２２へ送出される。 Here, the radio processing unit 221 uses the resource mapping unit 216 to convert the user data, the first reference signal, the second reference signal, the first control signal, and the second control signal to digital / Wireless transmission processing such as analog conversion and up-conversion is performed. The signal subjected to the wireless transmission process by the wireless processing unit 221 is transmitted to the antenna 222.
　さらに、無線処理部２２１は、アンテナ２２２を介して端末３０から受信した無線信号について、ダウンコンバート及びアナログ／デジタル変換などの無線受信処理を施すこともできる。無線処理部２２１によって無線受信処理を施された信号は、制御部２１７へ送出される。
　また、アンテナ２２２は、無線処理部２２１によって所定の無線処理を施された無線信号を端末３０及び４０へ送信する。 Further, the wireless processing unit 221 can perform wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the terminal 30 via the antenna 222. The signal subjected to the wireless reception process by the wireless processing unit 221 is sent to the control unit 217.
Further, the antenna 222 transmits a radio signal subjected to predetermined radio processing by the radio processing unit 221 to the terminals 30 and 40.
　さらに、アンテナ２２２は、端末３０及び４０から送信される無線信号を受信することもできる。アンテナ２２２によって受信された無線信号は、無線処理部２２１へ送出される。
　即ち、送受信部２２は、チャネル推定結果の結果を受信する第３の受信部の一例として機能し得る。 Further, the antenna 222 can receive radio signals transmitted from the terminals 30 and 40. A radio signal received by the antenna 222 is sent to the radio processing unit 221.
That is, the transmission / reception unit 22 can function as an example of a third reception unit that receives the result of the channel estimation result.
　また、送受信部２２は、第１のアンテナ（例えば、アンテナ２２２－１～２２２－４）に対応する第１の参照信号Ｒ１～Ｒ４を所定単位の第１のリソース（例えば、ＲＢ＃２）及び第２のリソース（例えば、ＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎ）にそれぞれマッピングし、第２のアンテナ（例えば、アンテナ２２２－５～２２２－ｎ）に対応する第２の参照信号Ｒ５～Ｒｎを第１のリソース（例えば、ＲＢ＃２）にマッピングし第２のリソース（例えば、ＲＢ＃１，ＲＢ＃３～ＲＢ＃Ｎ）にはマッピングしないで生成された無線信号を送信する送信部の一例として機能する。 Further, the transmitting / receiving unit 22 transmits the first reference signals R 1 to R 4 corresponding to the first antennas (for example, the antennas 222-1 to 222-4) to the first resource (for example, RB # 2) in a predetermined unit. ) And second resources (for example, RB # 1, RB # 3 to RB # N), respectively, and second reference signals corresponding to the second antennas (for example, antennas 222-5 to 222-n) Radio signals generated without mapping R 5 to R n to a first resource (for example, RB # 2) and not to a second resource (for example, RB # 1, RB # 3 to RB # N) It functions as an example of a transmission unit for transmission.
　これにより、本例では、基地局２０のアンテナ２２２の数が増加しても、アンテナ２２２に対応する参照信号のリソース占有率を大幅に抑制することができる。
　（１．４）端末３０の構成例
　図８は一実施形態に係る端末３０の構成の一例を示す図である。
　この図８に示す端末３０は、前記第１のリソースに対応する第１の受信機の一例として機能し、例示的に、送受信部３１と、処理部３２とをそなえる。 Thereby, in this example, even if the number of the antennas 222 of the base station 20 increases, the resource occupation rate of the reference signal corresponding to the antennas 222 can be significantly suppressed.
(1.4) Configuration Example of Terminal 30 FIG. 8 is a diagram illustrating an example of the configuration of the terminal 30 according to an embodiment.
The terminal 30 shown in FIG. 8 functions as an example of a first receiver corresponding to the first resource, and illustratively includes a transmission / reception unit 31 and a processing unit 32.
　送受信部（第１の受信部）３１は、例えば、基地局２０からの無線信号を受信する。
　このため、送受信部３１は、例示的に、複数のアンテナ３１１－１，３１１－２，・・・，３１１－ｍ（ｍは２以上の整数）と、無線処理部３１２とをそなえる。なお、以下では、アンテナ３１１－１，３１１－２，・・・，３１１－ｍを区別しない場合、単にアンテナ３１１と表記する。 The transmission / reception unit (first reception unit) 31 receives, for example, a radio signal from the base station 20.
Therefore, for example, the transmission / reception unit 31 includes a plurality of antennas 311-1, 311-2,..., 311-m (m is an integer of 2 or more) and a wireless processing unit 312. In the following description, the antennas 311-1, 311-2,...
　アンテナ３１１は、基地局２０から送信される無線信号を受信する。アンテナ３１１によって受信された無線信号は、無線処理部３１２へ送出される。
　また、アンテナ３１１は、無線処理部３１２によって所定の無線処理を施された無線信号を基地局２０へ送信することもできる。
　無線処理部３１２は、アンテナ３１１を介して基地局２０から受信した無線信号について、ダウンコンバート及びアナログ／デジタル変換などの無線受信処理を施す。無線処理部３１２によって無線受信処理を施された信号は、リソースデマッピング部３２１へ送出される。 The antenna 311 receives a radio signal transmitted from the base station 20. A radio signal received by the antenna 311 is sent to the radio processing unit 312.
The antenna 311 can also transmit a radio signal subjected to predetermined radio processing by the radio processing unit 312 to the base station 20.
The wireless processing unit 312 performs wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the base station 20 via the antenna 311. The signal subjected to the wireless reception processing by the wireless processing unit 312 is sent to the resource demapping unit 321.
　また、無線処理部３１２は、後述のチャネル推定部３２５によって生成されるチャネル推定結果について、デジタル／アナログ変換及びアップコンバートなどの無線送信処理を施すこともできる。無線処理部３１２によって無線送信処理を施された信号は、アンテナ３１１へ送出される。
　一方、処理部３２は、送受信部３１で受信した無線信号からユーザデータを抽出する。 The radio processing unit 312 can also perform radio transmission processing such as digital / analog conversion and up-conversion on the channel estimation result generated by the channel estimation unit 325 described later. The signal subjected to the wireless transmission processing by the wireless processing unit 312 is transmitted to the antenna 311.
On the other hand, the processing unit 32 extracts user data from the radio signal received by the transmission / reception unit 31.
　このため、処理部３２は、例示的に、リソースデマッピング部３２１と、制御信号抽出部３２２と、第１参照信号抽出部３２３と、第２参照信号抽出部３２４と、チャネル推定部３２５と、ユーザデータ抽出部３２６とをそなえる。
　制御信号抽出部３２２は、基地局２０から受信した信号から第１の制御信号及び第２の制御信号を抽出する。制御信号抽出部３２２は、例えば、受信した信号中の第１の制御信号及び第２の制御信号の位置に関する既知の情報に基づいて、第１の制御信号及び第２の制御信号を抽出することができる。 Therefore, for example, the processing unit 32 includes a resource demapping unit 321, a control signal extraction unit 322, a first reference signal extraction unit 323, a second reference signal extraction unit 324, a channel estimation unit 325, A user data extraction unit 326 is provided.
The control signal extraction unit 322 extracts the first control signal and the second control signal from the signal received from the base station 20. For example, the control signal extraction unit 322 extracts the first control signal and the second control signal based on known information regarding the positions of the first control signal and the second control signal in the received signal. Can do.
　リソースデマッピング部３２１は、制御信号抽出部３２２によって抽出された第１の制御信号及び第２の制御信号に基づいて、基地局２０から受信した信号を分離する。
　第１参照信号抽出部３２３は、制御信号抽出部３２２によって抽出された第１の制御信号に基づいて、リソースデマッピング部３２１によって分離された信号から第１の参照信号を抽出し、所定の受信処理を施す。 The resource demapping unit 321 separates the signal received from the base station 20 based on the first control signal and the second control signal extracted by the control signal extraction unit 322.
The first reference signal extraction unit 323 extracts the first reference signal from the signal separated by the resource demapping unit 321 based on the first control signal extracted by the control signal extraction unit 322, and performs predetermined reception Apply processing.
　第２参照信号抽出部３２４は、制御信号抽出部３２２によって抽出された第２の制御信号に基づいて、リソースデマッピング部３２１によって分離された信号から第２の参照信号を抽出し、所定の受信処理を施す。
　即ち、処理部３２は、受信した無線信号に含まれる第１の参照信号及び第２の参照信号をそれぞれ受信処理する第１の処理部の一例として機能する。 The second reference signal extraction unit 324 extracts a second reference signal from the signal separated by the resource demapping unit 321 based on the second control signal extracted by the control signal extraction unit 322, and performs predetermined reception. Apply processing.
That is, the processing unit 32 functions as an example of a first processing unit that receives and processes the first reference signal and the second reference signal included in the received wireless signal.
　また、チャネル推定部３２５は、第１参照信号抽出部３２３及び第２参照信号抽出部３２４によって抽出された第１の参照信号及び第２の参照信号に基づいて、チャネル推定処理を行なう。また、チャネル推定部３２５は、上記のチャネル推定結果を、送受信部３１を介して基地局２０へフィードバックしてもよい。
　ユーザデータ抽出部３２６は、チャネル推定部３２５によって生成されるチャネル推定結果に基づいて、リソースデマッピング部３２１によって分離された信号からユーザデータを抽出し、所定の受信処理を施す。 Further, the channel estimation unit 325 performs channel estimation processing based on the first reference signal and the second reference signal extracted by the first reference signal extraction unit 323 and the second reference signal extraction unit 324. Further, the channel estimation unit 325 may feed back the channel estimation result to the base station 20 via the transmission / reception unit 31.
The user data extraction unit 326 extracts user data from the signal separated by the resource demapping unit 321 based on the channel estimation result generated by the channel estimation unit 325, and performs predetermined reception processing.
　（１．５）端末４０の構成例
　図９は一実施形態に係る端末４０の構成の一例を示す図である。
　この図９に示す端末４０は、前記第２のリソースに対応する第２の受信機の一例として機能し、例示的に、送受信部４１と、処理部４２とをそなえる。
　送受信部（第２の受信部）４１は、例えば、基地局２０からの無線信号を受信する。 (1.5) Exemplary Configuration of Terminal 40 FIG. 9 is a diagram illustrating an exemplary configuration of the terminal 40 according to an embodiment.
The terminal 40 illustrated in FIG. 9 functions as an example of a second receiver corresponding to the second resource, and illustratively includes a transmission / reception unit 41 and a processing unit 42.
The transmitting / receiving unit (second receiving unit) 41 receives, for example, a radio signal from the base station 20.
　このため、送受信部４１は、例示的に、アンテナ４１１と、無線処理部４１２とをそなえる。
　アンテナ４１１は、基地局２０から送信される無線信号を受信する。アンテナ４１１によって受信された無線信号は、無線処理部４１２へ送出される。
　また、アンテナ４１１は、無線処理部４１２によって所定の無線処理を施された無線信号を基地局２０へ送信することもできる。 For this reason, the transmission / reception unit 41 exemplarily includes an antenna 411 and a wireless processing unit 412.
The antenna 411 receives a radio signal transmitted from the base station 20. A radio signal received by the antenna 411 is sent to the radio processing unit 412.
The antenna 411 can also transmit a radio signal subjected to predetermined radio processing by the radio processing unit 412 to the base station 20.
　無線処理部４１２は、アンテナ４１１を介して基地局２０から受信した無線信号について、ダウンコンバート及びアナログ／デジタル変換などの無線受信処理を施す。無線処理部４１２によって無線受信処理を施された信号は、リソースデマッピング部４２１へ送出される。
　また、無線処理部４１２は、後述のチャネル推定部４２４によって生成されるチャネル推定結果について、デジタル／アナログ変換及びアップコンバートなどの無線送信処理を施すこともできる。無線処理部４１２によって無線送信処理を施された信号は、アンテナ４１１へ送出される。 The wireless processing unit 412 performs wireless reception processing such as down-conversion and analog / digital conversion on the wireless signal received from the base station 20 via the antenna 411. The signal subjected to the wireless reception process by the wireless processing unit 412 is sent to the resource demapping unit 421.
The radio processing unit 412 can also perform radio transmission processing such as digital / analog conversion and up-conversion on the channel estimation result generated by the channel estimation unit 424 described later. The signal subjected to the wireless transmission process by the wireless processing unit 412 is transmitted to the antenna 411.
　一方、処理部４２は、送受信部４１で受信した無線信号からユーザデータを抽出する。
　このため、処理部４２は、例示的に、リソースデマッピング部４２１と、制御信号抽出部４２２と、第１参照信号抽出部４２３と、チャネル推定部４２４と、ユーザデータ抽出部４２５とをそなえる。
　制御信号抽出部４２２は、基地局２０から受信した信号から第１の制御信号を抽出する。制御信号抽出部４２２は、例えば、受信した信号中の第１の制御信号の位置に関する既知の情報に基づいて、第１の制御信号を抽出することができる。 On the other hand, the processing unit 42 extracts user data from the radio signal received by the transmission / reception unit 41.
Therefore, for example, the processing unit 42 includes a resource demapping unit 421, a control signal extraction unit 422, a first reference signal extraction unit 423, a channel estimation unit 424, and a user data extraction unit 425.
The control signal extraction unit 422 extracts a first control signal from the signal received from the base station 20. The control signal extraction unit 422 can extract the first control signal based on, for example, known information regarding the position of the first control signal in the received signal.
　リソースデマッピング部４２１は、制御信号抽出部４２２によって抽出された第１の制御信号に基づいて、基地局２０から受信した信号を分離する。
　第１参照信号抽出部４２３は、制御信号抽出部４２２によって抽出された第１の制御信号に基づいて、リソースデマッピング部４２１によって分離された信号から第１の参照信号を抽出し、所定の受信処理を施す。 The resource demapping unit 421 separates the signal received from the base station 20 based on the first control signal extracted by the control signal extraction unit 422.
The first reference signal extraction unit 423 extracts the first reference signal from the signal separated by the resource demapping unit 421 based on the first control signal extracted by the control signal extraction unit 422, and performs predetermined reception. Apply processing.
　即ち、処理部４２は、受信した無線信号に含まれる第１の参照信号を受信処理する第２の処理部の一例として機能する。
　また、チャネル推定部４２４は、第１参照信号抽出部４２３によって抽出された第１の参照信号に基づいて、チャネル推定処理を行なう。また、チャネル推定部４２４は、上記のチャネル推定結果を、送受信部４１を介して基地局２０へフィードバックしてもよい。 That is, the processing unit 42 functions as an example of a second processing unit that receives and processes the first reference signal included in the received radio signal.
Further, the channel estimation unit 424 performs channel estimation processing based on the first reference signal extracted by the first reference signal extraction unit 423. Further, the channel estimation unit 424 may feed back the channel estimation result to the base station 20 via the transmission / reception unit 41.
　ユーザデータ抽出部４２５は、チャネル推定部４２４によって生成されるチャネル推定結果に基づいて、リソースデマッピング部４２１によって分離された信号からユーザデータを抽出し、所定の受信処理を施す。
　以上のように、本例によれば、基地局２０のアンテナ２２２の数が増加しても、アンテナ２２２に対応する参照信号のリソース占有率を大幅に抑制することができる。 The user data extraction unit 425 extracts user data from the signal separated by the resource demapping unit 421 based on the channel estimation result generated by the channel estimation unit 424, and performs a predetermined reception process.
As described above, according to this example, even if the number of antennas 222 of the base station 20 increases, the resource occupancy rate of the reference signal corresponding to the antennas 222 can be significantly suppressed.
　〔２〕その他
　なお、上述した一実施形態における基地局２０，端末３０及び４０の各構成及び各機能は、必要に応じて取捨選択してもよいし、適宜組み合わせて用いてもよい。即ち、本発明の機能を発揮できるように、上記の各構成及び各機能を取捨選択したり、適宜組み合わせて用いたりしてもよい。 [2] Others The configurations and functions of the base station 20, the terminals 30 and 40 in the above-described embodiment may be selected as necessary, or may be used in appropriate combination. In other words, the above-described configurations and functions may be selected or used in appropriate combination so that the functions of the present invention can be exhibited.
　例えば、上述した例では、基地局２０のアンテナ２２２の数ｎが８個又は１６個の場合を例にして本実施形態を説明したが、これはあくまで一例であり、基地局２０のアンテナ数が５基以上であればよい。
　なお、アンテナ数が４基以下の基地局２０についても、本発明を適用することができることはいうまでもない。 For example, in the above-described example, the present embodiment has been described by taking the case where the number n of the antennas 222 of the base station 20 is 8 or 16, but this is only an example, and the number of antennas of the base station 20 is It may be 5 or more.
Needless to say, the present invention can also be applied to a base station 20 having four or fewer antennas.
　１０　無線通信システム
　２０　基地局
　２１　処理部
　２２　送受信部
　３０　端末
　３１　送受信部
　３２　処理部
　４０，４０－１，４０－２　端末
　４１　送受信部
　４２　処理部
　５０　無線エリア
　２１１　ユーザデータ生成部
　２１２　第１参照信号生成部
　２１３　第１制御信号生成部
　２１４　第２参照信号生成部
　２１５　第２制御信号生成部
　２１６　リソースマッピング部
　２１７　制御部
　２２１　無線処理部
　２２２－１，２２２－２，・・・，２２２－ｎ　アンテナ
　３１１－１，３１１－２，・・・，３１１－ｍ　アンテナ
　３１２　無線処理部
　３２１　リソースデマッピング部
　３２２　制御信号抽出部
　３２３　第１参照信号抽出部
　３２４　第２参照信号抽出部
　３２５　チャネル推定部
　３２６　ユーザデータ抽出部
　４１１　アンテナ
　４１２　無線処理部
　４２１　リソースデマッピング部
　４２２　制御信号抽出部
　４２３　第１参照信号抽出部
　４２４　チャネル推定部
　４２５　ユーザデータ抽出部 DESCRIPTION OF SYMBOLS 10 Wireless communication system 20 Base station 21 Processing part 22 Transmission / reception part 30 Terminal 31 Transmission / reception part 32 Processing part 40, 40-1, 40-2 Terminal 41 Transmission / reception part 42 Processing part 50 Wireless area 211 User data generation part 212 1st reference signal Generation unit 213 First control signal generation unit 214 Second reference signal generation unit 215 Second control signal generation unit 216 Resource mapping unit 217 Control unit 221 Radio processing unit 222-1, 222-2, ..., 222-n Antenna 311-1, 311-2,..., 311-m antenna 312 radio processing unit 321 resource demapping unit 322 control signal extraction unit 323 first reference signal extraction unit 324 second reference signal extraction unit 325 channel estimation unit 326 user Data extraction unit 411 Antenna 412 Wireless processing unit 421 Resource demarcation Ping unit 422 Control signal extraction unit 423 First reference signal extraction unit 424 Channel estimation unit 425 User data extraction unit

Claims (12)

  1. 　複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機と、該無線信号を受信する受信機とを有する無線通信システムにおいて、
    　前記送信機は、
    　前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する送信部を備え、
    　前記第１のリソースに対応する第１の受信機は、
    　前記無線信号を受信する第１の受信部と、
    　受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理する第１の処理部とを備え、
    　前記第２のリソースに対応する第２の受信機は、
    　前記無線信号を受信する第２の受信部と、
    　受信した前記無線信号に含まれる前記第１の参照信号を受信処理する第２の処理部とを備えた、
    ことを特徴とする、無線通信システム。     In a wireless communication system including a plurality of antennas, a transmitter that transmits a radio signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the radio signal.
    The transmitter is
    The first reference signal corresponding to the first antenna among the plurality of antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and corresponds to the second antenna among the plurality of antennas. A transmission unit configured to transmit a radio signal generated by mapping a second reference signal to the first resource and not mapping to the second resource;
    The first receiver corresponding to the first resource is:
    A first receiver for receiving the radio signal;
    A first processing unit for receiving and processing each of the first reference signal and the second reference signal included in the received radio signal;
    The second receiver corresponding to the second resource is:
    A second receiving unit for receiving the radio signal;
    A second processing unit for receiving and processing the first reference signal included in the received wireless signal,
    A wireless communication system.
  2. 　前記送信機の前記送信部は、前記第２の参照信号のマッピングに関する制御信号を送信し、
    　前記第１の受信機の前記第１の受信部は、前記制御信号を受信し、
    　前記第１の受信機の前記第１の処理部は、前記制御信号に基づいて前記無線信号に含まれる前記第２の参照信号を受信処理する、
    ことを特徴とする、請求項１記載の無線通信システム。     The transmitter of the transmitter transmits a control signal related to mapping of the second reference signal;
    The first receiver of the first receiver receives the control signal;
    The first processing unit of the first receiver receives and processes the second reference signal included in the radio signal based on the control signal;
    The wireless communication system according to claim 1, wherein:
  3. 　前記第１の受信機の前記第１の処理部は、
    　前記無線信号に含まれる前記第１の参照信号を受信処理し、
    　受信処理した前記第１の参照信号及び前記第２の参照信号に基づいてチャネル推定を行ない、前記チャネル推定の結果を前記送信機に送信する、
    ことを特徴とする、請求項２記載の無線通信システム。     The first processing unit of the first receiver is
    Receiving and processing the first reference signal included in the radio signal;
    Channel estimation is performed based on the received first reference signal and the second reference signal, and the channel estimation result is transmitted to the transmitter.
    The wireless communication system according to claim 2, wherein:
  4. 　前記送信機は、
    　前記チャネル推定結果の結果を受信する第３の受信部と、
    　受信した前記チャネル推定結果の結果に基づいて、プリコーディング処理又はビームフォーミング処理を行なう第３の処理部とを備えた、
    ことを特徴とする、請求項３記載の無線通信システム。     The transmitter is
    A third receiver for receiving the result of the channel estimation result;
    A third processing unit that performs precoding processing or beamforming processing based on the received channel estimation result,
    The wireless communication system according to claim 3, wherein:
  5. 　複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機において、
    　前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する送信部を備えた、
    ことを特徴とする、送信機。     In a transmitter that includes a plurality of antennas and transmits a radio signal in which a user is assigned to each predetermined unit of resource
    The first reference signal corresponding to the first antenna among the plurality of antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and corresponds to the second antenna among the plurality of antennas. A transmitter configured to transmit a radio signal generated by mapping a second reference signal to the first resource and not mapping the second reference signal to the second resource;
    A transmitter characterized by that.
  6. 　複数のアンテナを備えた送信機において所定単位のリソース毎にユーザを割り当てられ送信された無線信号を受信する受信機において、
    　前記送信機から、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を受信する受信部と、
    　受信した前記無線信号に含まれる前記第１の参照信号及び第２の参照信号をそれぞれ受信処理する処理部とを備えた、
    ことを特徴とする、受信機。     In a receiver that receives a radio signal that is assigned and transmitted by a user for each resource of a predetermined unit in a transmitter having a plurality of antennas,
    The transmitter maps the first reference signal corresponding to the first antenna among the plurality of antennas to the first resource and the second resource of the predetermined unit, respectively, and the second of the plurality of antennas. Receiving a radio signal generated by mapping a second reference signal corresponding to the antenna of the first resource to the first resource and not mapping to the second resource;
    A processing unit for receiving and processing each of the first reference signal and the second reference signal included in the received wireless signal,
    A receiver characterized by that.
  7. 　複数のアンテナを備え、所定単位のリソース毎にユーザを割り当てた無線信号を送信する送信機と、該無線信号を受信する受信機とを有する無線通信システムに用いられる無線通信方法において、
    　前記送信機は、
    　前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信し、
    　前記第１のリソースに対応する第１の受信機は、
    　前記無線信号を受信し、
    　受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理し、
    　前記第２のリソースに対応する第２の受信機は、
    　前記無線信号を受信し、
    　受信した前記無線信号に含まれる前記第１の参照信号を受信処理する、
    ことを特徴とする、無線通信方法。     In a wireless communication method used in a wireless communication system including a plurality of antennas, a transmitter that transmits a wireless signal to which a user is assigned for each predetermined unit of resource, and a receiver that receives the wireless signal,
    The transmitter is
    The first reference signal corresponding to the first antenna among the plurality of antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and corresponds to the second antenna among the plurality of antennas. Mapping a second reference signal to the first resource and transmitting a radio signal generated without mapping to the second resource;
    The first receiver corresponding to the first resource is:
    Receiving the wireless signal;
    Receiving and processing each of the first reference signal and the second reference signal included in the received wireless signal;
    The second receiver corresponding to the second resource is:
    Receiving the wireless signal;
    Receiving the first reference signal included in the received radio signal;
    A wireless communication method.
  8. 　前記送信機は、
    　前記第２の参照信号のマッピングに関する制御信号を送信し、
    　前記第１の受信機は、
    　前記送信機から受信した前記制御信号に基づいて前記無線信号に含まれる前記第２の参照信号を受信処理する、
    ことを特徴とする、請求項７記載の無線通信方法。     The transmitter is
    Transmitting a control signal relating to the mapping of the second reference signal;
    The first receiver
    Receiving the second reference signal included in the radio signal based on the control signal received from the transmitter;
    The wireless communication method according to claim 7, wherein:
  9. 　前記第１の受信機は、
    　前記無線信号に含まれる前記第１の参照信号を受信処理し、
    　受信処理した前記第１の参照信号及び前記第２の参照信号に基づいてチャネル推定を行ない、前記チャネル推定の結果を前記送信機に送信する、
    ことを特徴とする、請求項８記載の無線通信方法。     The first receiver
    Receiving and processing the first reference signal included in the radio signal;
    Channel estimation is performed based on the received first reference signal and the second reference signal, and the channel estimation result is transmitted to the transmitter.
    The wireless communication method according to claim 8, wherein:
  10. 　前記送信機は、
    　前記チャネル推定結果の結果を受信し、
    　受信した前記チャネル推定結果の結果に基づいて、プリコーディング処理又はビームフォーミング処理を行なう、
    ことを特徴とする、請求項９記載の無線通信方法。     The transmitter is
    Receiving the result of the channel estimation result;
    Based on the result of the received channel estimation result, precoding processing or beamforming processing is performed.
    The wireless communication method according to claim 9, wherein:
  11. 　所定単位のリソース毎にユーザを割り当てた無線信号を複数のアンテナを用いて送信する送信方法において、
    　前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を送信する、
    ことを特徴とする、送信方法。     In a transmission method for transmitting a radio signal to which a user is assigned for each predetermined unit of resource using a plurality of antennas,
    The first reference signal corresponding to the first antenna among the plurality of antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and corresponds to the second antenna among the plurality of antennas. Transmitting a radio signal generated by mapping a second reference signal to the first resource and not mapping the second reference signal to the second resource;
    The transmission method characterized by the above-mentioned.
  12. 　所定単位のリソース毎にユーザを割り当てられ複数のアンテナを用いて送信された無線信号を受信する受信方法において、
    　送信機から、前記複数のアンテナのうち第１のアンテナに対応する第１の参照信号を前記所定単位の第１のリソース及び第２のリソースにそれぞれマッピングし、前記複数のアンテナのうち第２のアンテナに対応する第２の参照信号を該第１のリソースにマッピングし該第２のリソースにはマッピングしないで生成された無線信号を受信し、
    　受信した前記無線信号に含まれる前記第１の参照信号及び前記第２の参照信号をそれぞれ受信処理する、
    ことを特徴とする、受信方法。     In a reception method for receiving a radio signal transmitted using a plurality of antennas to which a user is assigned for each resource of a predetermined unit,
    From the transmitter, the first reference signal corresponding to the first antenna among the plurality of antennas is mapped to the first resource and the second resource of the predetermined unit, respectively, and the second reference signal among the plurality of antennas Receiving a radio signal generated by mapping a second reference signal corresponding to an antenna to the first resource and not mapping to the second resource;
    Receiving and processing each of the first reference signal and the second reference signal included in the received radio signal;
    And a receiving method.
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