WO2010095468A1 - Wireless communication system, wireless communication method, wireless communication device, and program - Google Patents

Abstract

Disclosed is a wireless communication system equipped with a first wireless communication device, which transmits a signal using a multiplicity of continuous frequency bands that are not mutually continuous, and a second wireless communication device that receives the signal transmitted by the first wireless communication device. The first wireless communication device is equipped with a plurality of antennas and transmits by sequentially switching the antennas to arrange propagation path measurement reference signals in continuous frequency bands assigned to each antenna, and the second wireless communication device uses the propagation path measurement reference signals to measure the propagation path characteristics of the continuous frequency band assigned to the corresponding antenna for each antenna, and determines, based on said measurement results, the propagation path to be used by the first wireless communication device to transmit data from each of the antennas, whereby the propagation path measurement reference signals are transmitted so that the frequencies used can be efficiently determined.

Description

Wireless communication system, wireless communication method, wireless communication apparatus, and program

The present invention relates to a wireless communication system, a wireless communication method, a wireless communication apparatus, and a program.
This application claims priority based on Japanese Patent Application No. 2009-039612 filed in Japan on February 23, 2009, the contents of which are incorporated herein by reference.

The standardization of LTE (Long Term Evolution), which is a wireless communication system for 3.9th generation mobile phones, has started to converge, and recently, LTE, which is a 4th generation wireless communication system that has further evolved the LTE system. -A (LTE-Advanced, IMT-A, etc.) standardization started.

In order to improve the cell throughput (the total effective transmission amount of mobile stations in the cell) in the LTE-A uplink, it is considered to use a frequency band wider than the frequency band of 20 MHz used in LTE. ing. In the case where a band wider than 20 MHz is used, it is proposed to use a plurality of 20 MHz frequency bands used in the LTE system in consideration of compatibility with LTE. Therefore, when a frequency band exceeding 20 MHz is secured, PUCCHs (Physical Uplink Control Channels) exist at both ends in the 20 MHz frequency band used in the LTE system. The frequency band assigned to the apparatus and used for uplink data transmission is a discontinuous frequency band divided by PUCCH (see, for example, Non-Patent Document 1 and Non-Patent Document 2).
Further, as an improvement in cell throughput, not only the frequency band to be used is widened, but LTE has a single transmission antenna, while LTE-A has been studied to have a plurality of transmission antennas.

In the uplink of the LTE system, the channel (frequency) used by each mobile station apparatus is determined by DMRS (DeModulation Reference Signal), which is a reference signal used for channel estimation for channel compensation. Signal) or information on propagation path characteristics measured by SRS (Sounding Reference Signal) used for propagation path characteristic measurement. Among these reference signals, the demodulation reference signal is used when demodulating the data transmitted by the mobile station apparatus in the base station apparatus, and is therefore disposed only in the region where the data to be transmitted is disposed. However, in order to determine a propagation path (frequency) used by each mobile station apparatus, it is necessary to acquire propagation path characteristics of each propagation path in the entire usable frequency band, that is, in the entire frequency band excluding PUCCH. In the LTE system, the mobile station apparatus divides the reference signal for channel measurement over the entire frequency band excluding the PUCCH at once or multiple times, thereby acquiring the channel characteristics of each channel in the base station apparatus. It is possible.

However, in a system that has a plurality of transmission antennas and communicates using a plurality of continuous frequency bands that are discontinuous with each other, for example, in an LTE-A system, the reference for propagation path measurement is similar to the LTE system. If an attempt is made to arrange a signal over the entire frequency band excluding the PUCCH, the frequency band that can be simultaneously arranged is limited due to the limitation of the transmission power in the mobile station apparatus, etc. It takes a long time to finish arranging the reference signal for propagation path measurement in the continuous frequency band in the -A system). There is a problem that the propagation path (frequency) to be used cannot be determined efficiently because the propagation path condition changes during this time.

The present invention has been made in view of such circumstances, and an object of the present invention is to use a propagation path that has a plurality of transmission antennas and uses a plurality of discontinuous frequency bands that are discontinuous with each other. An object of the present invention is to provide a wireless communication system, a wireless communication method, a wireless communication apparatus, and a program for transmitting a propagation path measurement reference signal so that (frequency) can be determined efficiently.

(1) The present invention has been made to solve the above-described problems, and the wireless communication system according to the present invention transmits a signal using a frequency band composed of a plurality of LTE system frequency bands. A wireless communication system comprising a wireless communication device and a second wireless communication device that receives a signal transmitted by the first wireless communication device, wherein each of the first wireless communication devices is the LTE system. A plurality of antennas to which any one of the frequency bands is assigned, sequentially switching the antennas, arranging and transmitting a reference signal for propagation path measurement, and the second wireless communication apparatus is configured to transmit the propagation path measurement Using the reference signal, for each of the antennas, the propagation path characteristic of the frequency band of the LTE system allocated to the antenna is measured, and based on the measurement result, the first And determining a channel to be used for transmission of the transmission data by the wireless communication device.

(2) Further, the wireless communication system of the present invention is the above-described wireless communication system, wherein the second wireless communication apparatus is configured such that the first wireless communication apparatus refers to the propagation path measurement from each of the antennas. A frequency band and a transmission timing of the LTE system for transmitting a signal are determined and notified to the first wireless communication apparatus as control information, and the first wireless communication apparatus transmits the LTE notified by the control information. According to the frequency band of the system and the transmission timing, the antenna is sequentially switched to transmit a channel measurement reference signal.

(3) Moreover, the radio | wireless communications system of this invention is the above-mentioned radio | wireless communications system, Comprising: The transmission timing of the said reference signal for propagation path measurement is transmission of transmission data among the antennas of a said 1st radio | wireless communication apparatus. It is a transmission timing at which transmission of the reference signal for propagation path measurement from the antenna used in preference to is completed early.

(4) Moreover, the radio | wireless communications system of this invention is the above-mentioned radio | wireless communications system, Comprising: The said 2nd radio | wireless communication apparatus carries out the frequency band of the said LTE system to each antenna of the said 1st radio | wireless communication apparatus. When it is determined that there is an antenna whose propagation path characteristics do not exceed a preset quality among the antennas of the first wireless communication device, at least the antenna The frequency band of the LTE system to be allocated is changed.

(5) Moreover, the radio | wireless communications system of this invention is the above-mentioned radio | wireless communications system, Comprising: The said 2nd radio | wireless communication apparatus transmits the frequency band and transmission timing of the said LTE system which transmit the said reference signal for propagation path measurement. When the first wireless communication apparatus performs MIMO transmission, the frequency band of the LTE system that transmits the propagation path measurement reference signal is set to the same frequency for a plurality of antennas used for MIMO transmission. It is characterized by a band.

(6) In addition, the wireless communication device of the present invention is a wireless communication device that transmits a signal using a frequency band composed of a plurality of LTE system frequency bands, and each of the frequency bands of the LTE system. A plurality of antennas to which one of them is assigned, sequentially switching the antennas, and arranging and transmitting a reference signal for propagation path measurement.

(7) In addition, the wireless communication device of the present invention is transmitted from another wireless communication device including a plurality of antennas in the frequency band of the LTE system allocated to each of the antennas among the frequency bands of the plurality of LTE systems. And measuring the propagation path characteristics of the frequency band of the LTE system assigned to the antenna for each of the antennas using the reference signal for propagation path measurement. A wireless communication device that determines a propagation path to be used for transmission of transmission data by the other wireless communication device based on a result, wherein the other wireless communication device transmits the propagation path measurement reference signal from each of the antennas. The frequency band and transmission timing of the LTE system are switched so that the antennas are sequentially switched and a reference signal for propagation path measurement is arranged and transmitted. Determined, and notifying the other radio communication device as the control information.

(8) Moreover, the wireless communication method of the present invention includes a first wireless communication device that transmits a signal using a frequency band configured by a plurality of LTE system frequency bands, and the first wireless communication device transmits the signal. A wireless communication method in a wireless communication system including a second wireless communication device that receives a received signal, wherein the first wireless communication device includes a plurality of antennas included in the device, each of which includes the LTE. A first step of sequentially switching a plurality of antennas to which any one of the frequency bands of the system is allocated, and arranging and transmitting a reference signal for propagation path measurement; and the second wireless communication device includes the propagation path measurement For each of the antennas, the channel characteristics of the LTE system frequency band allocated to the antennas are measured using the reference signal for the first antenna, and the first And having a second process of determining a channel to be used for transmission of the transmission data by the line communication device.

(9) Further, the program of the present invention includes a plurality of antennas and a wireless communication apparatus that transmits signals using a plurality of LTE system frequency bands, each of which is one of the LTE system frequency bands. The antennas to which one is assigned are sequentially switched to function as means for arranging and transmitting a propagation path measurement reference signal.

(10) Further, the program of the present invention is a propagation transmitted from another radio communication apparatus having a plurality of antennas in the frequency band of the LTE system allocated to each of the antennas among the frequency bands of the plurality of LTE systems. A path measurement reference signal is received, and the propagation path characteristic of the frequency band of the LTE system allocated to the antenna is measured for each of the antennas using the propagation path measurement reference signal. A wireless communication device that determines a propagation path to be used for transmission of transmission data by the other wireless communication device, and the other wireless communication device transmits the propagation path measurement reference signal from each of the antennas. The LTE system frequency band and transmission timing are switched by sequentially switching the antenna and transmitting a channel measurement reference signal for transmission. Determined to so that, to function as a means for notifying the other radio communication device as the control information.

According to the present invention, the frequency to be used can be determined efficiently even in the case where communication is performed using a plurality of discontinuous frequency bands having a plurality of transmission antennas.

It is a schematic block diagram which shows the structure of the terminal device 10 by one Embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 101 in the embodiment. It is a schematic block diagram which shows the structure of the base station apparatus 20 in the same embodiment. It is a figure which shows the 1st arrangement pattern of the reference signal for propagation path measurement in the embodiment. It is a figure which shows the 2nd arrangement pattern of the reference signal for propagation path measurement in the embodiment. It is a figure explaining switching of the 1st arrangement pattern and the 3rd arrangement pattern in the embodiment. It is another figure explaining switching of the 1st arrangement pattern and the 3rd arrangement pattern in the embodiment. It is a figure which shows the 3rd arrangement pattern of the reference signal for propagation path measurement in the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The wireless communication system in the following embodiments includes a terminal device (also referred to as a first wireless communication device) 10 and a base station device (also referred to as a second wireless communication device) 20. Further, in the following embodiment, the terminal device 10 has two antennas, and the frequency bands that can be used for data transmission from the terminal device 10 to the base station device 20 are two consecutive frequencies that are discontinuous with each other. An example is shown for the case of bands. In the following embodiment, the two consecutive frequency bands that are discontinuous with each other are two 20 MHz frequency bands in which the frequency band for the control channel is arranged at both ends of each frequency band.

Specifically, the frequency band with a bandwidth of 40 MHz is divided into two frequency bands each with a bandwidth of 20 MHz, and both ends of each frequency band are frequency bands for the control channel. The frequency bands that can be used for data transmission to the station apparatus 20 are two frequency bands that are discontinuous with each other. However, the present invention is not limited to this example, and satisfies the two conditions that the terminal device 10 has a plurality of antennas used for transmission and a plurality of continuous frequency bands that can be used for data transmission. The present invention is applicable to any wireless communication system. Moreover, it is preferable that the number of antennas used for transmission by the terminal device 10 is smaller than or equal to the number of continuous frequency bands that can be used for data transmission.

FIG. 1 is a schematic block diagram showing the configuration of the terminal device 10. The terminal device 10 includes an RS generation unit 100, a mapping unit 110, a transmission processing unit 101, a radio unit 102, an antenna 103, a transmission processing unit 111, a radio unit 112, an antenna 113, a radio unit 120, a reception processing unit 121, and an arrangement instruction unit. 122.

The RS generation unit 100 generates a propagation path measurement reference signal based on the RS data length information that is set in advance or notified from the base station apparatus 20 and is the code length of the propagation path measurement reference signal. The RS generation unit 100 may generate a propagation path measurement reference signal by a predetermined calculation, or store a propagation path measurement reference signal of each RS data length, You may make it output the reference signal for propagation path measurement according to the input RS data length. Further, the reference signal for propagation path measurement uses an uplink signal-to-noise ratio (SNR), a signal, in order for the base station apparatus 20 to determine a band used by the terminal apparatus 10 for data transmission. This is a signal used by the base station apparatus 20 for measurement of uplink propagation path characteristics such as a signal-to-interference noise power ratio (SNIR; SignalSigntoInterference plus Noise power Ratio).

A mapping unit 110 (also referred to as an arrangement unit) is generated from transmission data input from the outside in accordance with an instruction of an antenna and a propagation path (frequency) where a transmission data signal and a propagation path measurement reference signal are arranged by the arrangement instruction unit 122 The transmission data signal and the propagation path measurement reference signal input from the RS generation unit 100 are arranged at a corresponding frequency and output to the transmission processing units 101 and 111 for the corresponding antenna. Here, the transmission data signal is, for example, when the transmission data is transmitted by an OFDMA (Orthogonal Frequency 誤 り Division Multiple Access) system, the bits of the transmission data are error-correction-encoded and then QPSK ( This is a signal composed of a modulation symbol modulated by a modulation method such as Quadrature Phase Shift Keying; 16QAM (16 Quadrature Amplitude Modulation) and a demodulation reference signal. In addition, when transmission data is transmitted by DFT-S-OFDM (Discrete-Fourier-Transform-Spread-OFDM), the transmission data signal is obtained by error-correcting the bits of the transmission data. , QPSK, 16QAM, etc., a signal composed of a discrete spectrum obtained by concatenating a plurality of modulation symbols in the time direction and Fourier-transformed and a demodulation reference signal.

The transmission processing unit 101 converts the input propagation path measurement reference signal and the transmission data signal into a transmission signal. The radio unit 102 up-converts the transmission signal received from the transmission processing unit 101 to a radio frequency and transmits the radio signal from the antenna 103. Similarly to the transmission processing unit 101, the transmission processing unit 111 converts the input channel measurement reference signal and the transmission data signal into a transmission signal. The radio unit 112 up-converts the transmission signal received from the transmission processing unit 111 to a radio frequency and transmits the radio signal from the antenna 113.

The transmission processing unit 101 and the wireless unit 102 function as one transmission unit, and the transmission processing unit 111 and the wireless unit 112 function as another transmission unit. Also, these transmitters use the center frequency of the continuous frequency band assigned to the antenna connected to the radio unit, as the oscillation frequency of the variable frequency oscillator having the crystal oscillator included in each radio unit 111, 112. By setting to, the oscillation frequency is set as the center frequency, and the operation is performed for a continuous frequency band having a bandwidth of 20 MHz. Antenna 103 is the antenna of antenna # 1. Antenna 113 is the antenna of antenna # 2.

Radio section 120 receives a signal transmitted from base station apparatus 20 via antenna 113, and outputs a reception signal obtained by down-converting the signal to a baseband frequency to reception processing section 121. The reception processing unit 121 detects reception data and control information from the reception signal, outputs the reception data to the outside, and outputs control information to the arrangement instruction unit 122. Arrangement instructing unit 122, from the control information detected by reception processing unit 121, arrangement pattern information indicating the combination of the frequency and antenna for arranging the reference signal for propagation path measurement, the frequency and antenna for arranging the signal of the transmission data, The information indicating the combination of the two is extracted, and in accordance with the information, the mapping unit 110 is instructed on the combination of the frequency and the antenna where the reference signal for propagation path measurement and the transmission data are arranged.

FIG. 2 is a schematic block diagram showing the configuration of the transmission processing unit 101. The transmission processing unit 101 includes an IFFT (Inverse / Fast / Fourier / Transform) unit 1003 and a CP (Cyclic / Prefix) insertion unit 1004. The transmission processing unit 111 has the same configuration as the transmission processing unit 101 except that the signal input from the mapping unit 110 is a signal for the antenna 113 and outputs the generated transmission signal to the radio unit 112. Is omitted.

IFFT section 1003 receives propagation path estimation reference signals and transmission data signals arranged in each subcarrier from mapping section 110, and performs inverse fast Fourier transform on these input signals to generate a time signal. . CP insertion section 1004 inserts a cyclic prefix into the time signal generated by IFFT section 1003 and outputs the result as a transmission signal to radio section 102.

FIG. 3 is a schematic block diagram showing the configuration of the base station apparatus 20. The base station apparatus 20 includes a radio unit 202, a CP removal unit 203, an FFT unit 204, an RS extraction unit 205, a propagation path information acquisition unit 206, a transmission processing unit 209, and a radio unit 210 for the antenna 201 of the antenna # 1. Similarly, the antenna 221 of the antenna # 2 includes a radio unit 202, a CP removal unit 203, an FFT unit 204, an RS extraction unit 205, a propagation path information acquisition unit 206, a transmission processing unit 209, and a radio unit 210. , A propagation path determination unit 207, a MIMO separation unit 211, and a plurality of reception processing units 208 each corresponding to each antenna on the transmission side.

The radio unit 202 receives a signal transmitted from the terminal apparatus 10 via a connected antenna of the antenna 201 or 221 for a frequency band (system band) having a bandwidth of 40 MHz, and transmits the signal to the baseband. Output the received signal down-converted to frequency. CP removing section 203 removes the cyclic prefix from the received signal output from radio section 202 and divides the received signal for each FFT interval. The FFT unit 204 performs Fourier transform on the received signal divided into FFT sections to convert it into a frequency signal.

The RS extraction unit 205 is the information included in the control information input from the propagation path determination unit 207 and is based on the information indicating the arrangement pattern of the propagation path measurement reference signal on the propagation path from the frequency signal to the propagation path. Extract a reference signal for measurement. Details of the information indicating the arrangement pattern will be described later. The propagation path information acquisition unit 206 (also referred to as a propagation path characteristic measurement unit) compares the extracted propagation path measurement reference signal with a known propagation path measurement reference signal (RS), and the antenna 103 of the terminal device 10. Alternatively, information on the propagation path of each subcarrier from 113 is obtained. Here, the propagation path information is a propagation path characteristic such as a signal-to-noise ratio (SNR), a signal-to-interference noise power ratio (SNIR), or a signal-to-interference-plus-noise-power ratio. .

The propagation path determination unit 207 is based on the propagation path information acquired by each of the propagation path information acquisition units 206 from the reference signal for propagation path measurement in the reception signals received by the antenna 201 and the antenna 221 and the transmission source antenna. A propagation path determined by the frequency, which is used for transmission of transmission data by the terminal device 10, is determined, and propagation path allocation information indicating the determined propagation path is generated. Here, the propagation path is determined by the antenna of the terminal device 10 serving as a transmission source and the frequency, specifically, a subcarrier as an example. Also, the propagation path determination unit 207 determines a propagation path pattern in which the terminal apparatus 10 arranges the propagation path measurement reference signal based on the propagation path information, and generates arrangement pattern information indicating the determined pattern. The propagation path determination unit 207 generates and outputs control information including the generated propagation path allocation information and arrangement pattern information. The propagation path determination unit 207 stores a plurality of pieces of arrangement pattern information in advance, and selects a propagation path measurement reference signal by selecting from among the arrangement patterns indicated by each of the stored arrangement pattern information. The pattern of the propagation path to be arranged is determined.

The MIMO separation unit 211 separates the frequency signal generated by each of the FFT units 204 into a signal for each antenna of the transmission source, and extracts a received data signal from each of the signals. The MIMO separation unit 211 determines a propagation path (subcarrier) in which a signal of received data is arranged based on propagation path information included in the control information input from the propagation path determination unit 207, and determines the propagation path By extracting the frequency signal, the received data signal is extracted from the frequency signal. Further, when the known multi-input multi-output (MIMO) is not performed, the MIMO separation unit 211 can extract the received data signal from the frequency signal generated by any of the FFT units 204. Alternatively, the frequency signals generated by the plurality of FFT units 204 may be combined, and the received data signal may be extracted from the combined signals. Each of the reception processing units 208 receives a reception data signal of a corresponding transmission source antenna from the MIMO separation unit 211, and outputs the reception data obtained by demodulation and decoding to the outside.

The transmission processing unit 209 generates a transmission signal that transmits the control information generated by the propagation path determination unit 207 and transmission data input from the outside. The radio unit 210 up-converts the transmission signal generated by the transmission processing unit 209 to a radio frequency and transmits the radio signal to the terminal device 10 via the antenna 201.

[First arrangement pattern]
Next, a description will be given of a first arrangement pattern in which antennas are sequentially switched and a propagation path measurement reference signal is transmitted from the antennas to continuous frequency bands assigned to the antennas. FIG. 4 is a diagram showing a first arrangement pattern of propagation path measurement reference signals in the present embodiment. The propagation path determination unit 207 of the base station apparatus 20 determines that the first arrangement pattern as illustrated in FIG. 4 is applied to the terminal apparatus 10, and the base station apparatus 20 determines the determined first arrangement. Arrangement pattern information indicating a pattern is included in the control information and transmitted to the terminal device 10. In the terminal device 10, the reception processing unit 121 detects control information from the signal received from the base station device 20. Next, the arrangement instructing unit 122 controls the mapping unit 110 to arrange the reference signal for channel measurement according to the arrangement pattern indicated by the arrangement pattern information included in the control information, that is, the arrangement pattern as illustrated in FIG. To do.

In FIG. 4, the vertical axis represents frequency and the horizontal axis represents time. Reference numerals F1 to F10 denote frequency bands that can be used for data transmission of transmission data within the system band, that is, frequency bands that can be allocated. The code C1 indicates a frequency band that cannot be assigned. Reference numerals T1 to T10 are radio frames each having a predetermined time period. In the present embodiment, the codes T1 to T10 have been described as being radio frames, but may be a time zone having a predetermined length, and may be two radio frames or three radio frames. Here, the frequency bands F1 to F5 are continuous frequency bands that can be used for data transmission of transmission data out of the 20 MHz frequency band in which the frequency band for the control channel is arranged at both ends. The frequency bands F6 to F10 are also continuous frequency bands that can be used for data transmission of transmission data, among the 20 MHz frequency bands in which the frequency band for the control channel is arranged at both ends. The frequency band C1 between the frequency bands F1 to F5 and the frequency bands F6 to F10 is a frequency band for the control channel, that is, a frequency band that cannot be used for data transmission from the terminal apparatus 10 to the base station apparatus 20.

Therefore, the frequency bands F1 to F5 and the frequency bands F6 to F10 are discontinuous, that is, two continuous frequency bands that are discontinuous with each other.
Further, the bandwidths of signals transmitted from the radio units 102 and 112 of the terminal device 10 via the antennas 103 and 113 are 20 MHz, respectively. Therefore, the terminal device 10 uses only one of the antennas 103 and 113 with respect to the entire frequency band including the frequency bands F1 to F5 and the frequency bands F6 to F10, and the frequency bands F1 to F5. And transmission using any one of the frequency bands F6 to F10 is possible.

In the first arrangement pattern, when transmitting a channel measurement reference signal, different continuous frequency bands F1 to F5 and F6 to F10 are assigned to the antenna 103 of the antenna # 1 and the antenna 113 of the antenna # 2. These antennas are sequentially switched during times T1 to T10, and the propagation path measurement reference signal is transmitted in the continuous frequency band assigned to each antenna.

Specifically, as illustrated in FIG. 4, first, the terminal apparatus 10 uses the frequency band F2 in the time zone T1 from the antenna 103 of the antenna # 1, and uses the frequency band F2 for the channel measurement reference signal (of the antenna # 1). RS signal). In the present embodiment, transmitting the propagation path measurement reference signal in a time zone such as the time zone T1 may be performed by arranging the transmission path measurement reference signal over the entire time zone. The reference signal for channel measurement may be arranged and transmitted in a predetermined time zone such as the end of the time zone. In addition, transmitting a channel measurement reference signal using a frequency band such as frequency band F2 means that the channel measurement reference signal is arranged and transmitted on all subcarriers constituting the frequency band. Alternatively, a propagation path measurement reference signal may be arranged and transmitted on a predetermined part of the subcarriers constituting the frequency band, such as every other subcarrier.

Next, the channel 113 reference signal (the RS signal of the antenna # 2) is transmitted from the antenna 113 of the antenna # 2 using the frequency band F7 in the time zone T2. Next, the reference signal for channel measurement is transmitted using the frequency band F4 from the antenna 103 of the antenna # 1 in the time zone T3 and further using the frequency band F9 from the antenna 113 of the antenna # 2 in the time zone T4. To do. Thereafter, in the same manner, the frequency band F1 from the antenna 103 of the antenna # 1 alternately in the time zone T5, the frequency band F6 from the antenna 113 of the antenna # 2 in the time zone T6, and the frequency band F5 from the antenna 103 of the antenna # 1 in the time zone T7. In the time band T8, the propagation path measurement is performed in the order of the frequency band F10 from the antenna 113 of the antenna # 2, the time band T9 from the antenna 103 of the antenna # 1 to the frequency band F3, and the time band T10 in order from the antenna 113 of the antenna # 2 to the frequency band F8. A reference signal is transmitted.

When transmission path measurement reference signals using continuous bands that can be used from the antennas 103 and 113 of the terminal apparatus 10 are transmitted in the time zones T1 to T10, the base station apparatus 20 transmits the propagation path measurement reference signals. From which frequency band is received, it is determined which frequency is used to transmit data from the antennas 103 and 113. In this way, by using the first arrangement pattern, the propagation path measurement reference signals are sequentially transmitted from the antennas # 1 and # 2 using the frequency bands F1 to F5 and F6 to F10, respectively. Compared to the case where the propagation path is determined later, the time from the start of transmission of the propagation path estimation reference signal to the determination of the propagation path can be halved.

In the present embodiment, the arrangement pattern information is, for example, information for each terminal device 10, and is an identification number indicating the arrangement pattern shown in FIG. 4 if the arrangement pattern information indicates the first arrangement pattern. The arrangement instructing unit 122 has an arrangement pattern composed of a combination of an identification number (arrangement pattern information) indicating the arrangement pattern, information indicating the frequency at which the channel measurement reference signal is arranged for each time zone, and information indicating the antenna. The information is stored in association with each other, and the combination of the frequency and antenna for allocating the reference signal for propagation path measurement is mapped according to the information on the arrangement pattern stored in association with the arrangement pattern information extracted from the control information. To the unit 110.

In addition, the arrangement pattern information is, for example, information for each antenna of the terminal device 10, and the antenna number and consecutive frequency bands that can be allocated (frequency band F1 to F5 combined with the antenna # 1 in FIG. 4). And the transition pattern in the frequency direction of the position where the channel measurement reference signal is arranged (in antenna # 1 in FIG. 4, the second highest frequency band (frequency band F2) among the assignable frequency bands) Information for identifying the fourth (frequency band F4), first (frequency band F1), fifth (frequency band F5), and third (frequency band F3) in order after being arranged at the position, Information indicating the time between them (in FIG. 4, once every two radio frames) and information indicating the time zone when the arrangement starts (antenna # 1 in FIG. 4 is time zone T1, and antenna # 2 is time zone T2). It may be a composed information may be information comprising a part of the information of these. For example, in the time zone T1, the arrangement pattern information is obtained from each antenna for each time zone, such as the frequency band F2 for the antenna # 1 and the frequency band F7 for the antenna # 2 in the time zone T2. It may be information indicating a position where a transmission path measurement reference signal to be transmitted is arranged.

In this case, the arrangement instructing unit 122 allocates information for identifying the transition pattern in the frequency direction at the position where the channel measurement reference signal is arranged, and the frequency band in which the channel measurement reference signal is arranged in each time zone. Information on transition patterns representing relative positions in possible continuous frequency bands is stored in association with each other. The arrangement instructing unit 122 reads out information on an arrangement pattern associated with information for identifying a transition pattern included in the arrangement pattern information extracted from the control information, and information constituting the information and other arrangement pattern information Accordingly, the mapping unit 110 is instructed about the combination of the frequency and the antenna for arranging the reference signal for propagation path measurement.

When a different continuous frequency band is assigned to each of the antennas of the terminal device 10 as in the first arrangement pattern, the propagation path determination unit 207 includes the propagation path information acquisition unit 206 in these antennas. When it is determined that there is an antenna whose measurement result does not exceed the preset propagation path characteristics, at least the continuous frequency band assigned to the antenna is changed, and each of the antennas of the terminal device 10 is mutually connected. A continuous frequency band to be assigned to each antenna is determined so that different continuous frequency bands are assigned.

For example, in FIG. 4, that is, in the first arrangement pattern, the terminal device 10 uses the antenna 103 for the propagation path measurement to the frequency bands F1 to F5 from the antenna 103 and from the antenna 2 to the frequency bands F6 to F10. The signal is arranged and transmitted. However, as a result of the propagation path information acquisition unit 206 of the base station apparatus 20 measuring the propagation path characteristics using the received reference signal for propagation path measurement, the propagation path determination unit 207 determines that the propagation path characteristics of the antenna # 1 are in advance. When it is determined that the set propagation path characteristics are not exceeded, the antenna 103 of the antenna # 1 uses the frequency band F6 to F10 and the antenna 113 of the antenna # 2 uses the frequency band F1 to F5 to measure the propagation path. Control information including arrangement pattern information for arranging and transmitting the reference signal is generated and transmitted to the terminal device 10. Further, the control information is generated and the arrangement pattern used by the terminal apparatus 10 may be changed after the channel measurement reference signal is transmitted to all frequencies within the assignable continuous band, or after the assignment. It may be after the propagation path measurement reference signal is transmitted to only a part of the possible continuous band.

In the first arrangement pattern, when there are a plurality of assignable continuous frequency bands, the channel measurement reference signal is transmitted in units of the assignable continuous frequency bands. Data transmission overhead (extra time required for transmission) can be reduced.

[Second arrangement pattern]
Next, when the number of antennas of the terminal device 10 and the number of consecutive frequency bands that can be allocated are the same, or when the number of consecutive frequency bands that can be allocated is larger than the number of antennas of the terminal device 10, In addition, a description will be given of a second arrangement pattern in which the transmission interval of the reference signal for propagation path measurement is changed between the main antenna and the sub antenna when the main antenna and the sub antenna exist. Here, the main antenna is an antenna preferentially used when data transmission of transmission data is performed from the terminal apparatus 10 to the base station apparatus 20. The sub-antenna is an antenna that is used in place of the main antenna when the propagation characteristics of the main antenna are poor or that is used in addition to the main antenna when the main antenna alone does not satisfy the required throughput. In this embodiment, the antenna 103 of the antenna # 1 is a main antenna, and the antenna 113 of the antenna # 2 is a sub antenna.

FIG. 5 is a diagram showing a second arrangement pattern of propagation path measurement reference signals in the present embodiment. That is, the propagation path determination unit 207 of the base station apparatus 20 determines that the second arrangement pattern as illustrated in FIG. 5 is applied to the terminal apparatus 10, and the base station apparatus 20 The arrangement pattern information indicating the arrangement pattern is included in the control information and transmitted to the terminal device 10. In the terminal device 10, the reception processing unit 121 detects control information from the signal received from the base station device 20. Next, the arrangement instructing unit 122 controls the mapping unit 110 so as to arrange the reference signal for channel measurement according to the arrangement pattern indicated by the arrangement pattern information included in the control information, that is, the arrangement pattern as illustrated in FIG. To do.

In FIG. 5, the vertical axis represents frequency and the horizontal axis represents time. The symbols F1 to F10 and the symbol C1 are the same as those in FIG. 4, the symbols F1 to F10 indicate frequency bands that can be allocated within the system band, and the symbol C1 indicates a frequency band that cannot be allocated. Reference numerals T1 to T15 are radio frames each having a predetermined time period.

The second arrangement pattern is that the propagation path determination reference signal for the propagation path determination unit 207 of the base station apparatus 20 determines the band to be used by the terminal apparatus 10 having the main antenna and the sub antenna for data transmission of transmission data. When transmitting, different main frequency bands F1 to F5 and F6 to F10 are allocated to the main antenna and the sub antenna, respectively. During the time periods T1 to T15, the propagation path measurement reference signals are alternately arranged and transmitted in the continuous frequency bands assigned to the antennas from these antennas. However, unlike the first arrangement pattern, the interval between the propagation path measurement reference signals transmitted from the main antenna and the sub antenna is different, and the propagation path measurement reference signal is transmitted from the main antenna to two time zones (for example, time zone T1). And T2), and the transmission is repeated from the sub-antenna in one time zone (for example, time zone T3). As described above, the second arrangement pattern increases the frequency of arranging the propagation path measurement reference signal from the main antenna as compared with the propagation path measurement reference signal from the sub antenna. The arrangement pattern is such that the transmission of the reference signal for path measurement is completed early.

Specifically, as shown in FIG. 5, first, from the main antenna (antenna 103 of antenna # 1), using the frequency band F2 in the time zone T1, the channel measurement reference signal (the RS signal of the main antenna). ). Here, to transmit the propagation path measurement reference signal in the time zone T1, the propagation path measurement reference signal may be arranged and transmitted over the entire time zone T1, or the end of the time zone or the like may be transmitted in advance. The reference signal for propagation path measurement may be arranged and transmitted in a predetermined part of the time zone. Also, transmitting the channel measurement reference signal using the frequency band F2 may be performed by arranging the channel measurement reference signal on all the subcarriers constituting the frequency band F2. Alternatively, a propagation path measurement reference signal may be arranged and transmitted on a part of subcarriers constituting the frequency band F2, such as every other subcarrier.

Next, a channel measurement reference signal (RS signal of the main antenna) is transmitted from the main antenna using the frequency band F4 in the time zone T2. Further, a propagation path measurement reference signal (sub-antenna RS signal) is transmitted from the sub-antenna using the frequency band F7 in the time zone T3. Next, a channel measurement reference signal is transmitted from the main antenna using the frequency band F1 in the time zone T4 and the frequency band F5 in the time zone T5. Next, a propagation path measurement reference signal is transmitted from the sub-antenna using the frequency band F9 in the time band T6.

Thereafter, transmission from the main antenna in two time zones and transmission from the sub-antenna in one time zone are repeated as follows. That is, a channel measurement reference signal is transmitted from the main antenna using the frequency F3 in the time zone T7 and the frequency band F2 in the time zone T8, and the channel measurement is performed from the sub antenna using the frequency band F6 in the time zone T9. A reference signal is transmitted. Next, a channel measurement reference signal is transmitted from the main antenna using the frequency band F4 in the time zone T10 and the frequency band F1 in the time zone T11, and propagated from the sub-antenna using the frequency band F10 in the time zone T12. A reference signal for path measurement is transmitted. Further, a propagation path measurement reference signal is transmitted from the main antenna using the frequency band F2 in the time zone T13 and the frequency band F4 in the time zone T14, and the propagation path is transmitted from the sub-antenna using the frequency band F8 in the time zone T15. Send a measurement reference signal.

For the main antenna, at the end of the time zone T7, transmission of the reference signal for propagation path measurement is completed in each of the frequency bands F1 to F5 constituting the assigned continuous frequency band. For this reason, in the base station apparatus 20, after receiving the propagation path measurement reference signal transmitted from the terminal apparatus 10 in the time zone T7, the propagation path determination unit 207 transmits transmission data from the main antenna of the terminal apparatus 10. The propagation path (subcarrier) to be used can be determined from the frequency bands F1 to F5. Therefore, the time from the measurement of the propagation path characteristics to the determination of the propagation path to be used can be the combined length of the time zones T1 to T7 even in the longest frequency band. This is shorter by three time zones than the combined length of the time zones T1 to T10 of the first arrangement pattern.

On the other hand, for the sub-antenna, transmission of the reference signal for propagation path measurement is completed in each of the frequency bands F6 to F10 constituting the assigned continuous frequency band at the end of the time zone T15. Thereafter, propagation path determining section 207 determines a propagation path (subcarrier) to be used for transmission of transmission data from the sub-antenna from frequency bands F6 to F10.
As described above, the second arrangement pattern can determine the frequency band used for transmission from the main antenna more efficiently than the first arrangement pattern, and reduces overhead when data is transmitted from the main antenna. Can do.

In the example of FIG. 5, the example in which the reference signal for propagation path measurement is transmitted using the frequency bands F1 to F5 from the antenna # 1 and the frequency bands F6 to F10 from the antenna # 2 is shown. When it is determined that the propagation path characteristics are poor as a result of receiving and measuring the propagation path measurement reference signal, the propagation path determining unit 207 determines the frequency bands F6 to F10 from the antenna # 1 and the frequency band from the antenna # 2. Arrangement pattern information for transmitting the reference signal for propagation path measurement is generated using F1 to F5 and transmitted to the terminal apparatus 10.

The second arrangement pattern shown in FIG. 5 is an arrangement pattern in which the channel measurement reference signal is transmitted from the main antenna in two time zones and then transmitted from the sub-antenna in one time zone. As long as the arrangement pattern is transmitted from the main antenna in more time zones than from the sub-antenna, the arrangement pattern may not be the same as this example. In the example of FIG. 5, the transmission interval of the reference signal for propagation path measurement from the main antenna and the sub antenna is constant, but after the frequency band used for transmission from the main antenna is determined, the first As in the arrangement pattern, the arrangement pattern may be changed such that the channel measurement reference signal is alternately transmitted from the main antenna and the sub antenna.

In this way, by transmitting a channel measurement reference signal from the main antenna at shorter intervals than the sub-antenna, the channel characteristics can be measured more quickly, and when determining the channel to be used for transmission of transmission data Furthermore, it can be made less susceptible to the influence of time fluctuations in the propagation path. For this reason, even when the time variation of the propagation path such as the terminal device 10 is moving is large, the propagation path determination unit 207 of the base station apparatus 20 is based on more accurate propagation path characteristics for the main antenna. A propagation path to be used for data transmission can be determined (scheduled). That is, since the overhead from the transmission of the reference signal for propagation path measurement to the data transmission is short, it is difficult to be affected by the time variation of the propagation path characteristics, and scheduling can be performed based on more accurate propagation path information.

[Third arrangement pattern]
Next, a case where a propagation path measurement reference signal is transmitted from a plurality of antennas using the same continuous frequency band will be described as a third arrangement pattern. This third arrangement pattern is the first arrangement pattern, that is, as shown in FIG. 4, using different consecutive frequency bands assigned to the respective antennas, the reference signals for channel measurement from a plurality of antennas. Used when switching between sending and receiving.

6 and 7 are diagrams for explaining switching between the first arrangement pattern and the third arrangement pattern. 6 and 7, the horizontal axis represents frequency. 6 and 7, there are two frequency bands F11 and F12, which are the same frequency bands as the frequency bands F1 to F5 and the frequency bands F6 to F10 in FIG. . And the terminal device 10 cannot transmit simultaneously from one antenna with respect to these two frequency bands F11 and F12. FIG. 6 is a diagram illustrating a case where a channel measurement reference signal is transmitted from the first arrangement pattern, that is, the antenna 103 of the antenna # 1 and the antenna 113 of the antenna # 2 using mutually different continuous frequency bands. is there.

At this time, the terminal apparatus 10 also transmits transmission data using the frequency band F11 from the antenna 103 of the antenna # 1, and transmits using the frequency band F12 from the antenna 113 of the antenna # 2. FIG. 7 is a diagram showing a case where a reference signal for channel measurement is transmitted from the third arrangement pattern, that is, the antenna 103 of antenna # 1 and the antenna 113 of antenna # 2 using the same continuous frequency band. is there. At this time, the terminal apparatus 10 also transmits transmission data using both the antenna 103 of the antenna # 1 and the antenna 113 of the antenna # 2 using the frequency band F11.

When the frequency band is allocated as shown in FIG. 6 and the reference signal for propagation path measurement is transmitted from the antennas # 1 and # 2, the terminal apparatus 10 specifically, for example, as shown in FIG. A measurement reference signal is arranged and transmitted. FIG. 8 shows a third arrangement pattern, which is an arrangement pattern of the channel measurement reference signal in the case where the frequency band is allocated and the channel measurement reference signal is transmitted from the antennas # 1 and # 2, as shown in FIG. FIG. The propagation path determination unit 207 of the base station apparatus 20 applies either the first arrangement pattern as illustrated in FIG. 4 or the third arrangement pattern as illustrated in FIG. 8 to the terminal apparatus 10. Is determined, and the base station apparatus 20 includes the arrangement pattern information indicating the determined first arrangement pattern in the control information and transmits the information to the terminal apparatus 10. In the terminal device 10, the reception processing unit 121 detects control information from the signal received from the base station device 20. Next, the mapping unit 122 arranges the channel measurement reference signal according to the arrangement pattern indicated by the arrangement pattern information included in the control information, that is, the arrangement pattern as illustrated in FIG. 4 or FIG. 110 is controlled.

In FIG. 8, the vertical axis represents frequency and the horizontal axis represents time. Reference numerals F1 to F10, C1, and T1 to T10 are the same as those in FIG.
In the third arrangement pattern, when transmitting the propagation path measurement reference signal, the same continuous frequency bands F6 to F10 are allocated to the antenna 103 of the antenna # 1 and the antenna 113 of the antenna # 2, and the time T1 to During T10, channel measurement reference signals are alternately transmitted from these antennas in the continuous frequency band assigned to each antenna and transmitted.

Specifically, as illustrated in FIG. 8, first, the terminal apparatus 10 uses the frequency band F7 in the time zone T1 from the antenna 103 of the antenna # 1, and uses the frequency band F7 for the channel measurement reference signal (of the antenna # 1). RS signal). Next, the propagation path measurement reference signal (RS signal of antenna # 2) is transmitted from antenna 113 of antenna # 2 using frequency band F7 in time band T2. Next, a reference signal for propagation path measurement is transmitted using the frequency band F9 from the antenna 103 of the antenna # 1 in the time zone T3 and further using the frequency band F9 from the antenna 113 of the antenna # 2 in the time zone T4. To do. Thereafter, in the same manner, the frequency band F6 from the antenna 103 of the antenna # 1 alternately in the time zone T5, the frequency band F6 from the antenna 113 of the antenna # 2 in the time zone T6, and the frequency band F10 from the antenna 103 of the antenna # 1 in the time zone T7. In the time zone T8, the propagation path measurement is performed in the order of the frequency band F10 from the antenna 113 of the antenna # 2, the time zone T9 from the antenna 103 of the antenna # 1 to the frequency band F8, and the time zone T10 in order from the antenna 113 of the antenna # 2 to the frequency band F8. A reference signal is transmitted.

The switching of the usage method between the first arrangement pattern and the third arrangement pattern is performed by the propagation path determination unit 207 based on the propagation path characteristics (reception quality) measured by the propagation path information acquisition unit 206 of the base station apparatus 20. decide. Specifically, after the terminal apparatus 10 transmits a reference signal for propagation path measurement with a third arrangement pattern in accordance with an instruction from the base station apparatus 20, the propagation path information acquisition unit 206 of the base station apparatus 20 Measure the propagation path characteristics. At this time, if the propagation path determining unit 207 determines that the measured propagation path characteristics regarding the antenna 113 of the antenna # 2 do not satisfy the certain quality Q1, the propagation path determination unit 207 generates arrangement pattern information indicating the first arrangement pattern. To the terminal device 10. Thereby, the arrangement pattern used by the terminal apparatus 10 for transmission of the propagation path measurement reference signal is switched from the third arrangement pattern to the first arrangement pattern.

Further, the propagation path determination unit 207 includes a propagation path information acquisition unit in the first arrangement pattern, that is, when the continuous frequency bands different from each other are assigned to the antennas of the terminal device 10. When it is determined that there is an antenna whose measurement result of 206 exceeds a preset constant quality Q2, the continuous frequency band assigned to the antenna is assigned to at least one antenna other than the antenna. In addition, a continuous frequency band assigned to each antenna may be determined, that is, a third arrangement pattern may be determined. Thereby, it is possible to perform data transmission using a known multi-input multi-output (MIMO). At this time, the predetermined constant quality Q2 may be the same propagation path characteristic as the previous constant quality Q1, or may be different.

For example, after transmitting the reference signal for propagation path measurement with the first arrangement pattern, the propagation path determination unit 207 determines that the propagation path characteristics regarding the antenna 113 of the measured antenna # 2 satisfy a certain quality Q1. At this time, arrangement pattern information indicating the third arrangement pattern is generated and transmitted to the terminal device 10. As a result, the arrangement pattern used by the terminal apparatus 10 for transmission of the propagation path measurement reference signal is switched from the first arrangement pattern to the third arrangement pattern. Here, SNR (Signal to Noise Power Ratio) is used as the propagation path characteristic. Also, the fact that the propagation path characteristics related to the antenna satisfy a certain quality Q1 means that, for example, the number of propagation paths that exceed a predetermined propagation path characteristic in a continuous frequency band assigned to the antenna is determined in advance. The number of propagation paths that exceed a predetermined propagation path characteristic among the continuous frequency bands assigned to the antenna may be the amount of data transmitted from the terminal device 10. There may be more than the number determined according to this, but it is not limited to these.

When a transmission apparatus having a plurality of antennas transmits a propagation path measurement reference signal, receives the propagation path measurement reference signal, and the reception apparatus measures the propagation path characteristics, and satisfies a certain quality, It is determined that data transmission by multiple input multiple output (MIMO) is possible, and data transmission can be performed from a plurality of antennas using the same frequency band. Therefore, in order to detect that a certain quality is satisfied, a propagation path measurement reference signal is transmitted from a plurality of antennas using the same frequency band, and propagation using the propagation path measurement reference signal is performed. It is necessary to measure the road characteristics. In such a case, the reference signal for propagation path measurement is transmitted from antenna # 1 and antenna # 2 by the method of using the frequency band of FIG.
A plurality of antennas transmit a propagation path reference signal using the same usable continuous frequency band, receive the propagation path measurement reference signal, and measure the propagation path characteristics. As a result, a certain quality Q2 is obtained. If not, multi-input multi-output cannot be used, so switching is performed so that the channel # 1 and antenna # 2 transmit the propagation path measurement reference signal using the band usage method of FIG.

In the present embodiment, the terminal apparatus 10 transmits a reference signal for propagation path measurement using the same continuous frequency bands F6 to F10 from the plurality of antennas 103 and 113 using the third arrangement pattern. In the base station apparatus 20 that has received the signal, the propagation path determination unit 207 outputs multiple inputs and multiple outputs for data transmission based on whether or not the result of measurement by the propagation path information acquisition unit 206 satisfies a certain quality Q2. Determine if it can be used. When the propagation path determination unit 207 determines that the measurement result of the propagation path information acquisition unit 206 does not satisfy the certain quality Q2 and the other input and other outputs cannot be used, the propagation pattern determination unit 207 determines the first arrangement pattern. Switch to the placement pattern. When switching to the first arrangement pattern in this way, the terminal apparatus 10 transmits the propagation path measurement reference signal from the antenna 103 using the frequency bands F1 to F5 and from the antenna 113 using the frequency bands F6 to F10. Therefore, in the base station apparatus 20 that has received them, the propagation path determination unit 207 can determine the propagation path to be used from a wider frequency band (F1 to F10).
As described above, when the channel measurement reference signal is transmitted from a plurality of antennas to different continuous frequency bands and the channel characteristic of a specific antenna satisfies the certain quality Q1, the certain quality is reduced. A channel measurement signal is transmitted from a plurality of antennas using the frequency band assigned to the antenna to be satisfied, and it is determined whether multiple inputs and multiple outputs can be used.

In addition, the RS generation unit 100, the mapping unit 110, the transmission processing units 101 and 111, the reception processing unit 121, the arrangement instruction unit 122 in FIG. 1, the CP removal unit 203, the FFT unit 204, the RS extraction unit 205, the propagation path in FIG. A program for realizing the functions of the information acquisition unit 206, the propagation path determination unit 207, the reception processing unit 208, and the transmission processing unit 209 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is recorded on the computer. These processes may be performed by causing the system to read and execute. Here, the “computer system” includes an OS and hardware such as peripheral devices.

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

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Terminal device 100 ... RS production | generation part 110 ... Mapping part 101, 111 ... Transmission process 102, 112 ... Radio | wireless part 103, 113 ... Antenna 120 ... Radio | wireless part 121 ... Reception process part 122 ... Arrangement | positioning instruction | indication part 1003 ... IFFT part 1004 ... CP insertion section 20 ... base station apparatus 201 ... antenna 202 ... radio section 203 ... CP removal section 204 ... FFT section 205 ... RS extraction section 206 ... propagation path information acquisition section 207 ... propagation path determination section 208 ... reception processing section 209 ... transmission Processing unit 210 ... Radio unit 211 ... MIMO separation unit

Claims (10)

1. A first wireless communication apparatus that transmits a signal using a frequency band configured from a plurality of LTE system frequency bands; and a second wireless communication apparatus that receives a signal transmitted by the first wireless communication apparatus. A wireless communication system comprising:
   The first wireless communication apparatus includes a plurality of antennas each assigned with any one of the frequency bands of the LTE system, sequentially switches the antennas, arranges and transmits a reference signal for propagation path measurement,
   The second wireless communication apparatus measures the propagation path characteristic of the frequency band of the LTE system assigned to the antenna for each of the antennas using the propagation path measurement reference signal, And determining a propagation path used for transmission of transmission data by the first wireless communication apparatus.
2. The second wireless communication apparatus determines a frequency band and a transmission timing of the LTE system in which the first wireless communication apparatus transmits the propagation path measurement reference signal from each of the antennas, Notify the first wireless communication device;
   The first wireless communication apparatus transmits a reference signal for propagation path measurement by sequentially switching the antennas according to the frequency band and transmission timing of the LTE system notified by the control information. Item 2. The wireless communication system according to Item 1.
3. The transmission timing of the reference signal for propagation path measurement is such that transmission of the reference signal for measurement of propagation path from the antenna of the first wireless communication apparatus used preferentially for transmission of transmission data is finished early. The wireless communication system according to claim 2, wherein the timing is timing.
4. The second wireless communication device is configured such that when one of the frequency bands of the LTE system is allocated to each antenna of the first wireless communication device, the antenna of the first wireless communication device 3. When it is determined that there is an antenna whose propagation path characteristic does not exceed a preset quality, at least a frequency band of the LTE system assigned to the antenna is changed. Wireless communication system.
5. When determining the frequency band and transmission timing of the LTE system that transmits the propagation path measurement reference signal, the second wireless communication device performs MIMO transmission when the first wireless communication device performs MIMO transmission. The radio communication system according to claim 2, wherein the frequency band of the LTE system that transmits the reference signal for propagation path measurement is set to the same frequency band for a plurality of antennas used for MIMO transmission.
6. A wireless communication apparatus that transmits a signal using a frequency band configured from a plurality of LTE system frequency bands,
   A wireless communication apparatus comprising: a plurality of antennas each assigned with any one of the frequency bands of the LTE system, wherein the antennas are sequentially switched and a propagation path measurement reference signal is arranged and transmitted.
7. Receiving a propagation path measurement reference signal transmitted in a frequency band of the LTE system assigned to each of the antennas among a plurality of frequency bands of the LTE system from another wireless communication apparatus having a plurality of antennas; For each of the antennas, a channel characteristic of the frequency band of the LTE system allocated to the antenna is measured using a path measurement reference signal, and based on the measurement result, transmission data by the other wireless communication device A wireless communication device for determining a propagation path to be used for transmission,
   The other wireless communication device transmits the propagation path measurement reference signal from each of the antennas, and arranges the propagation path measurement reference signal by sequentially switching the antenna between the frequency band and the transmission timing of the LTE system. A wireless communication device that determines to transmit and notifies the other wireless communication device as control information.
8. A first wireless communication apparatus that transmits a signal using a frequency band configured from a plurality of LTE system frequency bands; and a second wireless communication apparatus that receives a signal transmitted by the first wireless communication apparatus. A wireless communication method in a wireless communication system comprising:
   The first wireless communication apparatus is a plurality of antennas included in the first apparatus, and sequentially switches a plurality of antennas to which any one of the frequency bands of the LTE system is assigned, and transmits a reference signal for propagation path measurement. A first process of arranging and transmitting;
   The second wireless communication apparatus measures, for each of the antennas, the propagation path characteristic of the frequency band of the LTE system allocated to the antenna, using the propagation path measurement reference signal. And a second step of determining a propagation path used for transmission of transmission data by the first wireless communication device.
9. A wireless communication device computer comprising a plurality of antennas and transmitting signals using frequency bands of a plurality of LTE systems,
   A program for functioning as means for sequentially switching the antennas to which any one of the frequency bands of the LTE system is assigned and arranging and transmitting a reference signal for propagation path measurement.
10. Receiving a propagation path measurement reference signal transmitted in a frequency band of the LTE system assigned to each of the antennas among a plurality of frequency bands of the LTE system from another wireless communication apparatus having a plurality of antennas; For each of the antennas, a channel characteristic of the frequency band of the LTE system allocated to the antenna is measured using a path measurement reference signal, and based on the measurement result, transmission data by the other wireless communication device A wireless communication device computer for determining a propagation path used for transmission of
    The other wireless communication device transmits the propagation path measurement reference signal from each of the antennas, and arranges the propagation path measurement reference signal by sequentially switching the antenna between the frequency band and the transmission timing of the LTE system. A program for deciding to transmit and functioning as means for notifying the other wireless communication device as control information.

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