WO2021186812A1 - Receiving device, transmitting device, communication method, and program - Google Patents

Receiving device, transmitting device, communication method, and program Download PDF

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Publication number
WO2021186812A1
WO2021186812A1 PCT/JP2020/046365 JP2020046365W WO2021186812A1 WO 2021186812 A1 WO2021186812 A1 WO 2021186812A1 JP 2020046365 W JP2020046365 W JP 2020046365W WO 2021186812 A1 WO2021186812 A1 WO 2021186812A1
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signal
frame
blank frame
receiving device
setting
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PCT/JP2020/046365
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French (fr)
Japanese (ja)
Inventor
良知 堅岡
一生 菅野
利則 鈴木
石川　博康
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株式会社Ｋｄｄｉ総合研究所
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Publication of WO2021186812A1 publication Critical patent/WO2021186812A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention generally relates to a receiving device, a transmitting device, a communication method, and a program, and specifically to a wireless communication channel estimation technique.
  • Non-Patent Document 1 describes a method of removing interference components between signal components by sequentially separating the signal components.
  • Interference elimination can generate an accurate replica of the interference signal by obtaining sufficient channel estimation accuracy.
  • the reference signals for channel estimation so as not to interfere with each other, highly accurate channel estimation can be performed.
  • the present invention provides a technique for improving channel estimation accuracy in a frequency sharing system.
  • the receiving device is a receiving device that receives a signal transmitted from the transmitting device, and receives data in a frame during communication between the receiving means for receiving the signal and the transmitting device. It is included in the signal received by the receiving means based on the setting means for setting the blank frame not included, the estimating means for estimating the channel of the signal of the other system in the period corresponding to the blank frame, and the channel. It has a removing means for removing an interfering component from the other system, and a demodulating means for demodulating the data transmitted from the transmitting device based on the signal from which the interfering component has been removed.
  • the transmitting device is a transmitting device that transmits a signal to the receiving device, and is used by the receiving device to estimate a channel for a signal from another system to be removed in the receiving device.
  • the channel estimation accuracy can be improved in the frequency sharing system.
  • FIG. 1 is a diagram showing a system configuration example.
  • FIG. 2A is a diagram illustrating the setting of the blank frame.
  • FIG. 2B is a diagram illustrating the setting of the blank frame.
  • FIG. 3 is a diagram showing a hardware configuration example of each device.
  • FIG. 4 is a diagram showing a functional configuration example of the transmission device.
  • FIG. 5 is a diagram showing a functional configuration example of the receiving device.
  • FIG. 6 is a diagram showing an example of a processing flow executed by the transmitting device.
  • FIG. 7 is a diagram showing an example of a processing flow executed by the receiving device.
  • FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment.
  • the wireless communication system includes a cellular communication system.
  • the cellular communication system is an arbitrary generation cellular communication system such as a 5th generation (5G) system or a long-term evolution (LTE) system, and is configured to include a base station device 101 and a terminal device 102.
  • NS long-term evolution
  • the cellular communication system shall share the same frequency as other systems.
  • the other system may be, for example, a system different from the cellular communication system such as a fixed wireless access system, or for example, another cellular communication with a different management entity from the cellular communication system including the base station apparatus 101. It may be a system.
  • FIG. 1 shows that the signal transmitted by the transmitting device 111 of the other system A to the receiving device 112 of the other system A can interfere with the signal transmitted by the base station device 101 to the terminal device 102. ..
  • FIG. 1 shows that the signal transmitted by the transmitting device 121 of the other system B to the receiving device 122 of the other system B can interfere with the signal transmitted by the terminal device 102 to the base station device 101. There is.
  • the performance at the time of demodulation / decoding of the desired signal can be improved.
  • the sequential interference canceller SIC
  • demodulation / demodulation of the interference signal component is executed on the received signal, and the resulting data is encoded / modulated again, and the obtained modulated signal is obtained. Is multiplied by the channel estimate to generate a replica of the interference signal. Then, the replica of the interference signal is subtracted from the received signal, so that the interference signal component is removed from the received signal.
  • the desired signal component is removed by executing demodulation / decoding of the desired signal from the signal from which the interference signal component has been removed, generating a replica of the desired signal based on the result, and subtracting it from the received signal. Signal can be obtained. Then, based on the signal from which the desired signal component has been removed, it is possible to perform demodulation / decoding of the interference signal and replica generation to generate a replica of the interference signal with higher accuracy. For example, when the data to be transmitted is encoded by a turbo code, a convolutional code, or the like, the demodulation / decoding accuracy of the desired signal and the interference signal can be improved by repeating these processes.
  • the interference canceller in order for the interference canceller to exert a sufficient interference suppression function, it is required that highly accurate channel estimation is possible.
  • the radio resources time / frequency resources
  • the interference signal received by the base station device 101 or the terminal device 102 is a signal from another system, such adjustment cannot be performed. Therefore, it is not possible to perform channel estimation for signals from other systems with high accuracy.
  • data is generated in a frame in which the transmitting side device (transmitting device) of the base station device 101 and the terminal device 102 is communicating with the receiving side device (receiving device).
  • “during communication” here refers to a state in which a data frame including user data can be transmitted / received between the base station device 101 and the terminal device 102 at any time.
  • the blank frame may contain at least no data, while may include, for example, a control channel or a reference signal. That is, a no-signal period may be set that does not include the control channel and the reference signal, or the minimum information for communication control may be transmitted.
  • frame may be read as "subframe”.
  • the receiving device receives only the interference signal component in the period corresponding to the blank frame.
  • the receiving device shares the setting of which frame is set as the blank frame by communicating the control signal for setting the blank frame with, for example, the transmitting device.
  • the base station apparatus 101 sets a blank frame and notifies the terminal apparatus 102 of the setting.
  • the terminal device 102 may set a blank frame and notify the base station device 101 of the setting.
  • the transmitting device prevents the data from being transmitted in the blank frame according to its shared setting, and the receiving device performs channel estimation of the interfering signal in the blank frame according to its shared setting. In the blank frame, for example, functions other than channel estimation of the interference signal are turned off.
  • each process for receiving the desired signal and the process for generating the replica of the interference signal, excluding the channel estimation, are not executed.
  • the receiving device can perform channel estimation of the interfering signal with high accuracy based on the received interfering signal.
  • the receiving device can acquire information such as the arrangement of the reference signal regarding the interference signal in advance. For example, when the receiving device is the base station device 101, the information can be acquired from, for example, a network node that exchanges system information with another system. Further, when the receiving device is the terminal device 102, the information may be acquired by signaling from the base station device 101 (for example, by at least one of a broadcast signal and an individual signal).
  • the blank frame is set to have a length of two or more frames of the long method of the frame of the desired signal and the frame of the interference signal.
  • the interference signal for at least one frame can be received in the absence of the desired signal, and the channel estimation accuracy of the interference signal can be improved.
  • FIG. 2A for example, when the frame length of the interference signal is longer than the frame length of the desired signal, the number of frames of the desired signal corresponding to the length of two frames or more of the interference signal is set as a blank frame. Set.
  • FIG. 2B when the frame length of the desired signal is longer than the frame length of the interference signal, two frames of the desired signal are set as blank frames.
  • the blank frame is set in a plurality of consecutive frames.
  • FIGS. 2A and 2B show an example in which the number of frames to be set as blank frames is determined based on the longer two frames, for example, three frames. A larger number may be blank frames.
  • the necessity of generating a blank frame can be determined based on, for example, the radio quality in the receiving device.
  • a blank frame can be generated when the signal-to-noise and interference power ratio of the desired signal in the receiving device is below a predetermined value.
  • the reception success rate of the desired signal the ratio of the number of times the desired signal is successfully received to the number of times the signal is received
  • the removal of the interference signal is sufficiently effective. Since there is a possibility that there is no such thing, a blank frame can be set to estimate the channel of the interference signal. This makes it possible to perform channel estimation of the interference signal with high accuracy.
  • the receiving device uses, for example, a cyclic redundancy check (CRC) to determine whether the signal after demodulation / decoding has an error, and if there is no error, it is determined that the reception is successful.
  • CRC cyclic redundancy check
  • either the transmitting device or the receiving device may decide whether or not to generate a blank frame.
  • the base station device 101 operates as a receiving device (that is, when communicating on an uplink)
  • the base station device 101 identifies a reception success rate for a signal transmitted from a terminal device 102 operating as a transmitting device, and the terminal It may be possible to decide whether to have the device 102 set a blank frame.
  • the base station device 101 when the base station device 101 operates as a transmitting device (that is, when communicating on a downlink), the base station device 101 counts the number of HARQ (composite automatic repeat requests) retransmission requests in the terminal device 102 operating as a receiving device. By specifying the number of successful receptions, or by specifying whether or not the HARQ ACK from the terminal device 102 has been received, the reception success rate is specified, and a blank frame is set in the signal transmitted to the terminal device 102. You can decide whether to set it.
  • HARQ composite automatic repeat requests
  • a blank frame is set based on the number of receiving devices that have succeeded in receiving the signal among the plurality of receiving devices. It can be determined whether or not to do so. For example, it is determined to set a blank frame when the ratio of the number of receiving devices that have succeeded in receiving the signal to the number of receiving devices to which the signal is transmitted is less than a predetermined value. For example, when the base station device 101 operating as a transmitting device transmits a signal to a plurality of terminal devices 102 on a downlink and the reception success rate is low according to the number of terminal devices 102 that have succeeded in receiving the signal. It can be decided to set a blank frame.
  • the base station device 101 can specify whether or not each of the plurality of terminal devices 102 has succeeded in receiving, for example, by a HARQ retransmission request or ACK from the plurality of terminal devices 102.
  • the base station device 101 may decide to set a blank frame, for example, when the number of the terminal devices 102 that have transmitted the retransmission request exceeds a predetermined number among the plurality of terminal devices 102.
  • FIG. 3 shows a hardware configuration example of the communication device (base station device 101 or terminal device 102) according to the present embodiment.
  • the communication device includes a processor 301, a ROM 302, a RAM 303, a storage device 304, and a communication circuit 305.
  • the processor 301 is a computer including one or more processing circuits such as a general-purpose CPU (central processing unit) and an ASIC (integrated circuit for a specific application), and is stored in a ROM 302 or a storage device 304.
  • CPU central processing unit
  • ASIC integrated circuit for a specific application
  • the ROM 302 is a read-only memory that stores information such as programs and various parameters related to processing executed by the communication device.
  • the RAM 303 is a random access memory that functions as a workspace when the processor 301 executes a program and stores temporary information.
  • the storage device 304 is composed of, for example, a detachable external storage device or the like.
  • the communication circuit 305 includes a circuit for wireless communication. Although one communication circuit 305 is shown in FIG. 3, the communication device may have a plurality of communication circuits.
  • FIG. 4 shows an example of the functional configuration of the transmitter.
  • the transmission device includes, for example, a modulation coding unit 401, a frame control unit 402, a blank frame control unit 403, a blank frame setting unit 404, and an RF unit 405.
  • These functions can be realized, for example, by the processor incorporated in the communication circuit 305 executing a predetermined program. It should be noted that some of these functions may be realized, for example, by the processor 301 executing a program stored in the ROM 302 or the like.
  • FIG. 4 conceptually shows the functions of the transmission device, and it is not necessary to divide the functions as shown in FIG.
  • the transmitting device is mounted on both the base station device 101 and the terminal device 102, for example.
  • the modulation coding unit 401 error-corrects and encodes the transmission data series, modulates the coded bit string, and outputs the code.
  • the frame control unit 402 acquires the modulated symbol sequence, maps the symbol sequence within the frame, and generates a transmission target frame for transmitting the transmission data series.
  • the blank frame control unit 403 executes control for setting a predetermined timing and number of frames as blank frames in the frames during communication with the receiving device. For example, the blank frame control unit 403 outputs the frame number of the frame to be a blank frame to the frame control unit 402, and the frame control unit 402 describes the no-signal period, the control signal, and the reference for the frame of the frame number. By transmitting only the signal, a blank frame containing no data is output.
  • the frame control unit 402 does not map the output symbol sequence of the modulation coding unit 401 in the blank frame.
  • the blank frame setting unit 404 determines whether or not to generate a blank frame, sets the timing and length of the blank frame, and the like. If it is agreed in advance that a blank frame is set periodically, the blank frame setting unit 404 may be omitted. As described above, the blank frame setting unit 404 determines whether or not to generate a blank frame based on, for example, radio quality. Further, the blank frame setting unit 404 is blank as described with reference to FIGS. 2A and 2B based on, for example, the frame length of the interference signal from another system and the frame length of the frame transmitted by the own device. The period to be framed can be determined.
  • the blank frame setting unit 404 shares the determined setting with the receiving device.
  • the blank frame setting unit 404 may receive the setting from the receiving device and pass it to the blank frame control unit 403.
  • the RF unit 405 executes various processes executed by a general transmitter on the generated frame, converts it into an RF signal format, and transmits the RF signal.
  • FIG. 5 shows an example of the functional configuration of the receiving device.
  • the receiving device includes, for example, an RF unit 501, a local system signal processing unit 511, another system signal processing unit 521, a blank frame control unit 531 and a blank frame setting unit 532.
  • the own system signal processing unit 511 includes a demodulation unit 512, a channel estimation unit 513, and a decoding unit 514.
  • the other system signal processing unit 521 includes a demodulation unit 522, a channel estimation unit 523, a decoding unit 524, and a replica generation unit 525. These functions can be realized, for example, by the processor incorporated in the communication circuit 305 executing a predetermined program.
  • FIG. 5 conceptually shows the functions of the receiving device, and it is not necessary to divide the functions as shown in FIG.
  • the receiving device is mounted on both the base station device 101 and the terminal device 102, for example.
  • the RF unit 501 executes various processes executed by a general transmitter on the received RF signal, and outputs, for example, a baseband waveform.
  • This waveform is input to, for example, another system signal processing unit 521 and the adder 502 (via, for example, a delayer).
  • the demodulation unit 522 of the other system signal processing unit 521 demodulates the interference signal based on the input waveform. This demodulation is performed using the channel estimates estimated by the channel estimation unit 523.
  • As the demodulation method using the channel estimated value for example, a method of dividing the value indicating the waveform by the channel estimated value may be used, or a general method known to those skilled in the art may be used.
  • the channel estimation unit 523 estimates the channel of the interference signal.
  • the channel estimation unit 523 grasps in advance the time / frequency position where the reference signal of the signal of another system exists, and estimates the channel of the interference signal based on the value of the received signal at that position.
  • the channel estimation unit 523 may, for example, perform channel estimation of the interference signal only during the blank frame period.
  • the channel estimation unit 523 may hold the channel estimation value estimated during the immediately preceding blank frame until the channel is estimated in the next blank claim. As a result, it is possible to prevent the accuracy of the channel estimation value from being deteriorated by performing the channel estimation during a period other than the blank frame.
  • the bit string obtained by demodulation by the demodulation unit 522 is input to the decoding unit 524, and error correction decoding is executed for the bit string.
  • the decoding result of the decoding unit 524 is input to the replica generation unit 525.
  • the replica generation unit 525 error-corrects and encodes the bit string obtained as a result of decoding using the same coding method used by the transmission device, and modulates the error-correction-encoded sequence. Then, the replica generation unit 525 generates a replica of the interference signal by multiplying the modulated symbol sequence by the channel estimation value estimated by the channel estimation unit 523.
  • the generated replica is input to the adder 502.
  • the received signal with the same timing and the replica of the interference signal are input, and the waveform resulting from the subtraction of the interference signal from the received signal is output.
  • the demodulation unit 512 executes demodulation processing on this waveform.
  • the channel estimation value estimated by the channel estimation unit 513 is used.
  • the channel estimation unit 513 extracts the waveform obtained by subtracting the interference signal from the received signal at the position of the time and frequency at which the reference signal of the desired signal is transmitted, and acquires the channel estimation value.
  • the replica signal generated by the replica generation unit 525 has high accuracy, the interference signal component is removed with high accuracy, so that channel estimation can be performed with high accuracy, and the demodulation accuracy in the demodulation unit 512 is also high. Can be improved.
  • the bit string obtained by the demodulation by the demodulation unit 512 is input to the decoding unit 514, error correction decoding is performed, and the data of the desired signal is extracted. A CRC check or the like is executed on the decrypted data, and a HARQ retransmission request or an ACK transmission is performed as necessary.
  • the blank frame control unit 531 makes only the channel estimation unit 523 of the other system signal processing unit 521 operate in the frame set as the blank frame by the transmitting device, so that the own system signal processing unit 511 and the other system signal processing unit 521 operate. Control is performed so that the functional units other than the channel estimation unit 523 of the above do not operate. As a result, the channel estimation accuracy of the interference signal by the channel estimation unit 523 can be improved.
  • the blank frame setting unit 532 determines whether or not to generate a blank frame in the transmission device, sets the timing and length of the blank frame, and the like. If it is agreed in advance that a blank frame is set periodically, the blank frame setting unit 532 may be omitted. As described above, the blank frame setting unit 532 determines whether or not to cause the transmitter to generate a blank frame based on, for example, radio quality. Further, the blank frame setting unit 532 is blank as described with reference to FIGS. 2A and 2B based on, for example, the frame length of the interference signal from another system and the frame length of the frame received by the own device. The period to be framed can be determined. The blank frame setting unit 532 shares the determined setting with the transmitting device. The blank frame setting unit 532 may receive the setting from the transmission device and pass it to the blank frame control unit 531.
  • the transmitting device executes the setting of the blank frame (S601). For example, by communicating information about the settings with the receiving device, the common settings are recognized by the transmitting device and the receiving device. If the setting is determined in advance, the process of S601 may be omitted. Further, in the example of FIG. 6, an example is shown in which the process of S601 is not executed once the setting is made, but this setting may be executed periodically, for example.
  • the transmitting device determines whether the frame to be transmitted is set as a blank frame when communicating with the receiving device (S602).
  • the transmitting device generates a blank frame containing no user data (S603) for a frame set as a blank frame (YES in S602), and NO for a frame not set as a blank frame (NO in S602). ), A data frame including user data is generated (S604). Then, the transmitting device transmits the generated frame (S605). After that, the transmitting device can repeatedly execute the same process until, for example, the connection with the receiving device is disconnected.
  • the receiving device executes the setting of the blank frame (S701). For example, by communicating information about the settings with the transmitting device, the common settings are recognized by the transmitting device and the receiving device. If the setting is determined in advance, the process of S701 may be omitted. Further, in the example of FIG. 7, an example is shown in which the process of S701 is not executed once the setting is made, but this setting may be executed periodically, for example.
  • the receiving device determines whether the currently received frame is a frame set as a blank frame with respect to the received wireless signal, for example, based on the frame number of the desired signal (S702). Then, the receiving device executes channel estimation of the interference signal during the period when the frame is a blank frame (YES in S702) (S703). On the other hand, in the period other than the blank frame, the receiving device executes demodulation / decoding of the interference signal based on the channel estimated value estimated in S703 (S704), and interferes using the result and the channel estimated value. Generate a replica of the signal (S705). Then, the receiving device subtracts the generated replica signal from the received signal (S706), and demodulates / decodes the desired signal from the subtracted signal (S707).
  • this embodiment shows an example in which the interference signal is demodulated / decoded first, but the present invention is not limited to this.
  • the powers of the desired signal and the interference signal may be compared, and the signal to be demodulated / decoded first may be determined based on the power ratio.
  • a replica of the desired signal is generated and subtracted from the received signal.
  • the interference signal is demodulated / decoded using the channel estimated value estimated in S703.
  • a replica of the interference signal is generated, subtracted from the received signal, and the desired signal is demodulated / decoded again based on the subtraction result. In this way, when the iterative processing is executed, it is not necessary for the interference signal to be demodulated / decoded first.

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Abstract

This receiving device for receiving a signal transmitted from a transmitting device: establishes a blank frame that does not contain data, in frames being communicated between the transmitting device and the receiving device; estimates the channel of a signal of another system in a period corresponding to the blank frame; removes an interference component due to the other system, contained in the received signal, on the basis of said channel; and demodulates the data transmitted from the transmitting device on the basis of the signal from which the interference component has been removed.

Description

受信装置、送信装置、通信方法、及びプログラムReceiver, transmitter, communication method, and program
　本発明は、一般に受信装置、送信装置、通信方法、及びプログラムに関し、具体的には無線通信のチャネル推定技術に関する。 The present invention generally relates to a receiving device, a transmitting device, a communication method, and a program, and specifically to a wireless communication channel estimation technique.
　無線通信の用途が多様化し、様々なシステムにおいて無線通信機能が用いられるようになっている。一方で、周波数リソースは限られており、複数のシステムが周波数帯域を共用することが想定される。複数の無線システムが共通の周波数帯域を共用する場合、これらのシステム間の無線信号が干渉してしまいうる。非特許文献１には、逐次的に信号成分を分離することにより、信号成分間の干渉成分を除去する手法が記載されている。 The use of wireless communication has diversified, and the wireless communication function has come to be used in various systems. On the other hand, frequency resources are limited, and it is assumed that multiple systems share a frequency band. When multiple wireless systems share a common frequency band, the wireless signals between these systems can interfere. Non-Patent Document 1 describes a method of removing interference components between signal components by sequentially separating the signal components.
　干渉除去は、十分なチャネル推定精度が得られることによって、正確な干渉信号のレプリカを生成することができる。ここで、同一のシステム内においては、例えば、チャネル推定のための参照信号が相互に干渉しないように配置することにより、高精度なチャネル推定を行うことができる。一方、異なるシステム間では、相互に干渉しないように参照信号を配置することは困難であり、チャネル推定精度の向上ができない。 Interference elimination can generate an accurate replica of the interference signal by obtaining sufficient channel estimation accuracy. Here, in the same system, for example, by arranging the reference signals for channel estimation so as not to interfere with each other, highly accurate channel estimation can be performed. On the other hand, it is difficult to arrange reference signals between different systems so as not to interfere with each other, and it is not possible to improve the channel estimation accuracy.
　本発明は、周波数共用システムにおいてチャネル推定精度を向上させる技術を提供する。 The present invention provides a technique for improving channel estimation accuracy in a frequency sharing system.
　本発明の一態様による受信装置は、送信装置から送信された信号を受信する受信装置であって、信号を受信する受信手段と、前記送信装置との間での通信中のフレームにおいて、データを含まないブランクフレームの設定を行う設定手段と、前記ブランクフレームに対応する期間において他のシステムの信号のチャネルを推定する推定手段と、前記チャネルに基づいて、前記受信手段において受信した信号に含まれる前記他のシステムからの干渉成分を除去する除去手段と、前記干渉成分が除去された信号に基づいて、前記送信装置から送信されたデータの復調を行う復調手段と、を有する。 The receiving device according to one aspect of the present invention is a receiving device that receives a signal transmitted from the transmitting device, and receives data in a frame during communication between the receiving means for receiving the signal and the transmitting device. It is included in the signal received by the receiving means based on the setting means for setting the blank frame not included, the estimating means for estimating the channel of the signal of the other system in the period corresponding to the blank frame, and the channel. It has a removing means for removing an interfering component from the other system, and a demodulating means for demodulating the data transmitted from the transmitting device based on the signal from which the interfering component has been removed.
　本発明の一態様による送信装置は、受信装置へ信号を送信する送信装置であって、前記受信装置において除去されるべき他のシステムからの信号について前記受信装置がチャネルを推定するために用いられる、前記受信装置との間での通信中のフレームにおいてデータを含まないブランクフレームの設定を行う設定手段と、前記ブランクフレームにおいて信号を送信せず、当該ブランクフレームを除くフレームにおいて前記受信装置へ信号を送信する送信手段と、を有する。 The transmitting device according to one aspect of the present invention is a transmitting device that transmits a signal to the receiving device, and is used by the receiving device to estimate a channel for a signal from another system to be removed in the receiving device. , A setting means for setting a blank frame that does not include data in a frame being communicated with the receiving device, and a signal to the receiving device in a frame other than the blank frame without transmitting a signal in the blank frame. Has a transmission means for transmitting the data.
　本発明によれば、周波数共用システムにおいてチャネル推定精度を向上させることができる。 According to the present invention, the channel estimation accuracy can be improved in the frequency sharing system.
　本発明のその他の特徴及び利点は、添付図面を参照とした以下の説明により明らかになるであろう。なお、添付図面においては、同じ若しくは同様の構成には、同じ参照番号を付す。 Other features and advantages of the present invention will be clarified by the following description with reference to the accompanying drawings. In the attached drawings, the same or similar configurations are given the same reference numbers.
　添付図面は明細書に含まれ、その一部を構成し、本発明の実施の形態を示し、その記述と共に本発明の原理を説明するために用いられる。
図１は、システム構成例を示す図である。 図２Ａは、ブランクフレームの設定を説明する図である。 図２Ｂは、ブランクフレームの設定を説明する図である。 図３は、各装置のハードウェア構成例を示す図である。 図４は、送信装置の機能構成例を示す図である。 図５は、受信装置の機能構成例を示す図である。 図６は、送信装置によって実行される処理の流れの例を示す図である。 図７は、受信装置によって実行される処理の流れの例を示す図である。 The accompanying drawings are included in the specification and are used to form a part thereof, show embodiments of the present invention, and explain the principles of the present invention together with the description thereof.
FIG. 1 is a diagram showing a system configuration example. FIG. 2A is a diagram illustrating the setting of the blank frame. FIG. 2B is a diagram illustrating the setting of the blank frame. FIG. 3 is a diagram showing a hardware configuration example of each device. FIG. 4 is a diagram showing a functional configuration example of the transmission device. FIG. 5 is a diagram showing a functional configuration example of the receiving device. FIG. 6 is a diagram showing an example of a processing flow executed by the transmitting device. FIG. 7 is a diagram showing an example of a processing flow executed by the receiving device.
　以下、添付図面を参照して実施形態を詳しく説明する。なお、以下の実施形態は特許請求の範囲に係る発明を限定するものでなく、また実施形態で説明されている特徴の組み合わせの全てが発明に必須のものとは限らない。実施形態で説明されている複数の特徴のうち２つ以上の特徴が任意に組み合わされてもよい。また、同一若しくは同様の構成には同一の参照番号を付し、重複した説明は省略する。 Hereinafter, embodiments will be described in detail with reference to the attached drawings. The following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the features described in the embodiments may be arbitrarily combined. In addition, the same or similar configuration will be given the same reference number, and duplicated explanations will be omitted.
　（システム構成）
　図１に、本実施形態に係る無線通信システムの構成例を示す。本無線通信システムは、一例において、セルラ通信システムを含んで構成される。セルラ通信システムは、例えば、第５世代（５Ｇ）のシステムやロングタームエボリューション（ＬＴＥ）のシステムなど、任意の世代のセルラ通信システムであり、基地局装置１０１と端末装置１０２とを含んで構成される。このシステムにおいて、セルラ通信システムは、他システムと同一の周波数を共用するものとする。ここで、他システムとは、例えば、固定無線アクセスシステム等のセルラ通信システムと異なるシステムであってもよいし、例えば、基地局装置１０１を含んだセルラ通信システムと管理主体の異なる別のセルラ通信システムであってもよい。 (System configuration)
FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment. In one example, the wireless communication system includes a cellular communication system. The cellular communication system is an arbitrary generation cellular communication system such as a 5th generation (5G) system or a long-term evolution (LTE) system, and is configured to include a base station device 101 and a terminal device 102. NS. In this system, the cellular communication system shall share the same frequency as other systems. Here, the other system may be, for example, a system different from the cellular communication system such as a fixed wireless access system, or for example, another cellular communication with a different management entity from the cellular communication system including the base station apparatus 101. It may be a system.
　周波数リソースが共用される無線通信システムにおいては、システム間の干渉が問題となる。例えば、図１では、基地局装置１０１が端末装置１０２へ送信した信号に対して、他システムＡの送信装置１１１が他システムＡの受信装置１１２へ送信した信号が干渉しうることを示している。同様に、図１では、端末装置１０２が基地局装置１０１へ送信した信号に対して、他システムＢの送信装置１２１が他システムＢの受信装置１２２へ送信した信号が干渉しうることを示している。 In wireless communication systems where frequency resources are shared, interference between systems becomes a problem. For example, FIG. 1 shows that the signal transmitted by the transmitting device 111 of the other system A to the receiving device 112 of the other system A can interfere with the signal transmitted by the base station device 101 to the terminal device 102. .. Similarly, FIG. 1 shows that the signal transmitted by the transmitting device 121 of the other system B to the receiving device 122 of the other system B can interfere with the signal transmitted by the terminal device 102 to the base station device 101. There is.
　このような干渉が発生するシステムでは、一例として、干渉キャンセラを用いて信号から干渉成分を除去することにより、希望信号の復調・復号時の性能を改善することができる。例えば、逐次型干渉キャンセラ（ＳＩＣ）によれば、まず、受信信号に対して干渉信号成分の復調・復調が実行され、その結果得られたデータが再度符号化・変調され、得られた変調信号にチャネル推定値が乗算されることにより、干渉信号のレプリカが生成される。そして、この干渉信号のレプリカが、受信信号から減算されることにより、その受信信号から干渉信号成分が除去される。なお、干渉信号成分が除去された信号から、希望信号の復調・復号を実行し、その結果に基づいて希望信号のレプリカを生成して、受信信号から減算することにより、希望信号成分が除去された信号を得ることができる。そして、この希望信号成分が除去された信号に基づいて、干渉信号の復調・復号やレプリカ生成を実行して、干渉信号のレプリカをより高精度に生成することもできる。例えば、送信対象データがターボ符号や畳み込み符号などで符号化されている場合などに、これらの処理を繰り返すことにより、希望信号と干渉信号の復調・復号精度を向上させることができる。 In a system where such interference occurs, as an example, by removing the interference component from the signal using an interference canceller, the performance at the time of demodulation / decoding of the desired signal can be improved. For example, according to the sequential interference canceller (SIC), first, demodulation / demodulation of the interference signal component is executed on the received signal, and the resulting data is encoded / modulated again, and the obtained modulated signal is obtained. Is multiplied by the channel estimate to generate a replica of the interference signal. Then, the replica of the interference signal is subtracted from the received signal, so that the interference signal component is removed from the received signal. The desired signal component is removed by executing demodulation / decoding of the desired signal from the signal from which the interference signal component has been removed, generating a replica of the desired signal based on the result, and subtracting it from the received signal. Signal can be obtained. Then, based on the signal from which the desired signal component has been removed, it is possible to perform demodulation / decoding of the interference signal and replica generation to generate a replica of the interference signal with higher accuracy. For example, when the data to be transmitted is encoded by a turbo code, a convolutional code, or the like, the demodulation / decoding accuracy of the desired signal and the interference signal can be improved by repeating these processes.
　一方、干渉キャンセラが十分な干渉抑圧機能を発揮するには、高精度なチャネル推定が可能であることが要求される。ここで、基地局装置１０１や端末装置１０２が受信する干渉信号が同一のシステムからの信号である場合、そのシステム内で、例えば参照信号が送信されるべき無線リソース（時間・周波数リソース）を調整することができる。しかしながら、基地局装置１０１や端末装置１０２が受信する干渉信号が他システムからの信号である場合、そのような調整を行うことができない。このため、他システムからの信号についてのチャネル推定を高精度に行うことができない。 On the other hand, in order for the interference canceller to exert a sufficient interference suppression function, it is required that highly accurate channel estimation is possible. Here, when the interference signals received by the base station device 101 and the terminal device 102 are signals from the same system, for example, the radio resources (time / frequency resources) to which the reference signal should be transmitted are adjusted in the system. can do. However, when the interference signal received by the base station device 101 or the terminal device 102 is a signal from another system, such adjustment cannot be performed. Therefore, it is not possible to perform channel estimation for signals from other systems with high accuracy.
　本実施形態では、このような事情に鑑み、基地局装置１０１と端末装置１０２のうちの送信側の装置（送信装置）が、受信側の装置（受信装置）との通信中のフレームにおいて、データを含まないブランクフレームの設定を行う。なお、ここでの「通信中」は、例えば、基地局装置１０１と端末装置１０２との間でいつでもユーザデータを含んだデータフレームが送受信可能な状態を指す。例えば、基地局装置１０１と端末装置１０２との間での通信に無線リソースが割り当てられた最初のフレームがブランクフレームである場合、実際に通信は行われていないが通信中であると呼ぶ。また、ブランクフレームは、少なくともデータを含まず、一方で、例えば、制御チャネルや参照信号を含んでもよい。すなわち、制御チャネルや参照信号までも含まれない無信号期間が設定されるようにしてもよいし、通信制御のための最小限の情報は送信されるようにしてもよい。なお、「フレーム」は「サブフレーム」と読み替えられてもよい。 In this embodiment, in view of such circumstances, data is generated in a frame in which the transmitting side device (transmitting device) of the base station device 101 and the terminal device 102 is communicating with the receiving side device (receiving device). Set a blank frame that does not include. Note that "during communication" here refers to a state in which a data frame including user data can be transmitted / received between the base station device 101 and the terminal device 102 at any time. For example, when the first frame to which the radio resource is allocated for the communication between the base station device 101 and the terminal device 102 is a blank frame, it is said that the communication is not actually performed but is in progress. Also, the blank frame may contain at least no data, while may include, for example, a control channel or a reference signal. That is, a no-signal period may be set that does not include the control channel and the reference signal, or the minimum information for communication control may be transmitted. In addition, "frame" may be read as "subframe".
　このようにブランクフレームが設定されると、受信装置は、そのブランクフレームに対応する期間において、干渉信号成分のみを受信することとなる。なお、受信装置は、例えば送信装置との間で、ブランクフレームの設定のための制御信号を通信することにより、どのフレームをブランクフレームとするかの設定を共有する。例えば、基地局装置１０１がブランクフレームを設定して、その設定を端末装置１０２へ通知する。なお、端末装置１０２が、ブランクフレームを設定して、その設定を基地局装置１０１へ通知してもよい。送信装置は、その共有された設定に従ってブランクフレームにおいてデータを送信しないようにし、受信装置は、その共有された設定に従ってブランクフレームにおいて干渉信号のチャネル推定を実行するようにする。ブランクフレームにおいては、例えば干渉信号のチャネル推定以外の機能をオフとする。すなわち、希望信号の受信処理のための各処理と、干渉信号のレプリカ生成のための処理のうちチャネル推定を除いた処理については実行されない。受信装置は、受信した干渉信号に基づいて、その干渉信号のチャネル推定を高精度に行うことができる。なお、受信装置は、干渉信号に関する参照信号の配置などの情報について、事前に取得しうる。例えば、受信装置が基地局装置１０１である場合、例えば他システムとの間でシステムの情報を交換するネットワークノードから、その情報を取得しうる。また、受信装置が端末装置１０２である場合、基地局装置１０１からの（例えば報知信号と個別信号との少なくともいずれかによる）シグナリングによって、その情報を取得してもよい。 When the blank frame is set in this way, the receiving device receives only the interference signal component in the period corresponding to the blank frame. The receiving device shares the setting of which frame is set as the blank frame by communicating the control signal for setting the blank frame with, for example, the transmitting device. For example, the base station apparatus 101 sets a blank frame and notifies the terminal apparatus 102 of the setting. The terminal device 102 may set a blank frame and notify the base station device 101 of the setting. The transmitting device prevents the data from being transmitted in the blank frame according to its shared setting, and the receiving device performs channel estimation of the interfering signal in the blank frame according to its shared setting. In the blank frame, for example, functions other than channel estimation of the interference signal are turned off. That is, each process for receiving the desired signal and the process for generating the replica of the interference signal, excluding the channel estimation, are not executed. The receiving device can perform channel estimation of the interfering signal with high accuracy based on the received interfering signal. The receiving device can acquire information such as the arrangement of the reference signal regarding the interference signal in advance. For example, when the receiving device is the base station device 101, the information can be acquired from, for example, a network node that exchanges system information with another system. Further, when the receiving device is the terminal device 102, the information may be acquired by signaling from the base station device 101 (for example, by at least one of a broadcast signal and an individual signal).
　なお、ブランクフレームは、希望信号のフレームと干渉信号のフレームとのうちの長い法のフレームが２つ分以上の長さに設定される。これにより、少なくとも１フレーム分の干渉信号を、希望信号がない状態で受信することができるようになり、干渉信号のチャネル推定精度を向上させることができる。例えば、図２Ａに示すように、例えば、干渉信号のフレーム長が、希望信号のフレーム長より長い場合、干渉信号の２フレーム分以上の長さに対応する個数の希望信号のフレームをブランクフレームとして設定する。また、図２Ｂに示すように、希望信号のフレーム長が、干渉信号のフレーム長より長い場合、希望信号の２つのフレームをブランクフレームとして設定する。なお、図２Ａ及び図２Ｂに示すように、ブランクフレームは、連続した複数個のフレームにおいて設定される。なお、図２Ａ及び図２Ｂは、フレーム長の長い方の２フレーム分を基準としてブランクフレームとして設定されるべきフレームの数を決定する場合の例を示しているが、例えば、３フレーム分など、より多くの数をブランクフレームとしてもよい。 The blank frame is set to have a length of two or more frames of the long method of the frame of the desired signal and the frame of the interference signal. As a result, the interference signal for at least one frame can be received in the absence of the desired signal, and the channel estimation accuracy of the interference signal can be improved. For example, as shown in FIG. 2A, for example, when the frame length of the interference signal is longer than the frame length of the desired signal, the number of frames of the desired signal corresponding to the length of two frames or more of the interference signal is set as a blank frame. Set. Further, as shown in FIG. 2B, when the frame length of the desired signal is longer than the frame length of the interference signal, two frames of the desired signal are set as blank frames. As shown in FIGS. 2A and 2B, the blank frame is set in a plurality of consecutive frames. Note that FIGS. 2A and 2B show an example in which the number of frames to be set as blank frames is determined based on the longer two frames, for example, three frames. A larger number may be blank frames.
　また、ブランクフレームの生成要否は、例えば、受信装置における無線品質に基づいて決定されうる。例えば、受信装置における希望信号の信号対雑音及び干渉電力比が所定値を下回る場合に、ブランクフレームが生成されうる。また、例えば、受信装置における、希望信号の受信成功率（信号の受信回数に対する希望信号の受信成功回数の比）が所定値を下回った場合に、干渉信号の除去が十分に有効に動作していない可能性があるため、ブランクフレームを設定して干渉信号のチャネル推定を行うようにしうる。これにより、干渉信号のチャネル推定を高精度に実行することができるようになる。受信装置は、例えば、サイクリック・リダンダンシ・チェック（ＣＲＣ）を用いて、復調・復号後の信号に誤りがあるかを判定し、誤りがない場合に受信に成功したと判定する。この場合、ブランクフレームを生成するか否かを、送信装置と受信装置とのいずれが決定してもよい。例えば、基地局装置１０１は、受信装置として動作する場合（すなわち、上りリンクで通信する場合）に、送信装置として動作する端末装置１０２から送信された信号についての受信成功率を特定し、その端末装置１０２にブランクフレームを設定させるかを決定しうる。また、基地局装置１０１は、送信装置として動作する場合（すなわち、下りリンクで通信する場合）に、受信装置として動作する端末装置１０２におけるＨＡＲＱ（複合自動再送要求）の再送要求の回数をカウントすることにより、または、端末装置１０２からのＨＡＲＱのＡＣＫを受信したか否かによって受信に成功した回数を特定することによって、受信成功率を特定し、その端末装置１０２へ送信する信号においてブランクフレームを設定するかを決定しうる。 Further, the necessity of generating a blank frame can be determined based on, for example, the radio quality in the receiving device. For example, a blank frame can be generated when the signal-to-noise and interference power ratio of the desired signal in the receiving device is below a predetermined value. Further, for example, when the reception success rate of the desired signal (the ratio of the number of times the desired signal is successfully received to the number of times the signal is received) in the receiving device falls below a predetermined value, the removal of the interference signal is sufficiently effective. Since there is a possibility that there is no such thing, a blank frame can be set to estimate the channel of the interference signal. This makes it possible to perform channel estimation of the interference signal with high accuracy. The receiving device uses, for example, a cyclic redundancy check (CRC) to determine whether the signal after demodulation / decoding has an error, and if there is no error, it is determined that the reception is successful. In this case, either the transmitting device or the receiving device may decide whether or not to generate a blank frame. For example, when the base station device 101 operates as a receiving device (that is, when communicating on an uplink), the base station device 101 identifies a reception success rate for a signal transmitted from a terminal device 102 operating as a transmitting device, and the terminal It may be possible to decide whether to have the device 102 set a blank frame. Further, when the base station device 101 operates as a transmitting device (that is, when communicating on a downlink), the base station device 101 counts the number of HARQ (composite automatic repeat requests) retransmission requests in the terminal device 102 operating as a receiving device. By specifying the number of successful receptions, or by specifying whether or not the HARQ ACK from the terminal device 102 has been received, the reception success rate is specified, and a blank frame is set in the signal transmitted to the terminal device 102. You can decide whether to set it.
　また、送信装置が、複数の受信装置のそれぞれに対して信号を送信している場合、その複数の受信装置のうちの、信号の受信に成功した受信装置の数に基づいて、ブランクフレームを設定するか否かを判定しうる。例えば、信号の送信先の受信装置の数に対する信号の受信に成功した受信装置の数の比が所定値を下回る場合に、ブランクフレームを設定すると決定される。例えば、送信装置として動作する基地局装置１０１は、下りリンクで複数の端末装置１０２に信号を送信し、その信号の受信に成功した端末装置１０２の数に応じて、その受信成功率が低い場合に、ブランクフレームを設定すると決定しうる。なお、基地局装置１０１は、複数の端末装置１０２のそれぞれが受信に成功したか否かを、例えば、その複数の端末装置１０２からのＨＡＲＱの再送要求やＡＣＫによって、特定することができる。基地局装置１０１は、例えば、複数の端末装置１０２のうち、再送要求を送信した端末装置１０２の数が所定数を超える場合に、ブランクフレームを設定することを決定しうる。 When the transmitting device transmits a signal to each of a plurality of receiving devices, a blank frame is set based on the number of receiving devices that have succeeded in receiving the signal among the plurality of receiving devices. It can be determined whether or not to do so. For example, it is determined to set a blank frame when the ratio of the number of receiving devices that have succeeded in receiving the signal to the number of receiving devices to which the signal is transmitted is less than a predetermined value. For example, when the base station device 101 operating as a transmitting device transmits a signal to a plurality of terminal devices 102 on a downlink and the reception success rate is low according to the number of terminal devices 102 that have succeeded in receiving the signal. It can be decided to set a blank frame. The base station device 101 can specify whether or not each of the plurality of terminal devices 102 has succeeded in receiving, for example, by a HARQ retransmission request or ACK from the plurality of terminal devices 102. The base station device 101 may decide to set a blank frame, for example, when the number of the terminal devices 102 that have transmitted the retransmission request exceeds a predetermined number among the plurality of terminal devices 102.
　以下では、このような処理を実行する送信装置及び受信装置の構成と、処理の流れの例について説明する。 In the following, the configuration of the transmitting device and the receiving device that execute such processing and an example of the processing flow will be described.
　（装置構成）
　図３に、本実施形態に係る通信装置（基地局装置１０１又は端末装置１０２）のハードウェア構成例を示す。通信装置は、一例において、プロセッサ３０１、ＲＯＭ３０２、ＲＡＭ３０３、記憶装置３０４、及び通信回路３０５を含んで構成される。プロセッサ３０１は、汎用のＣＰＵ（中央演算装置）や、ＡＳＩＣ（特定用途向け集積回路）等の、１つ以上の処理回路を含んで構成されるコンピュータであり、ＲＯＭ３０２や記憶装置３０４に記憶されているプログラムを読み出して実行することにより、通信装置の全体の処理や、上述の各処理を実行する。ＲＯＭ３０２は、通信装置が実行する処理に関するプログラムや各種パラメータ等の情報を記憶する読み出し専用メモリである。ＲＡＭ３０３は、プロセッサ３０１がプログラムを実行する際のワークスペースとして機能し、また、一時的な情報を記憶するランダムアクセスメモリである。記憶装置３０４は、例えば着脱可能な外部記憶装置等によって構成される。通信回路３０５は、無線通信用の回路を含んで構成される。なお、図３では、１つの通信回路３０５が図示されているが、通信装置は、複数の通信回路を有しうる。 (Device configuration)
FIG. 3 shows a hardware configuration example of the communication device (base station device 101 or terminal device 102) according to the present embodiment. In one example, the communication device includes a processor 301, a ROM 302, a RAM 303, a storage device 304, and a communication circuit 305. The processor 301 is a computer including one or more processing circuits such as a general-purpose CPU (central processing unit) and an ASIC (integrated circuit for a specific application), and is stored in a ROM 302 or a storage device 304. By reading and executing the existing program, the entire processing of the communication device and each of the above-mentioned processing are executed. The ROM 302 is a read-only memory that stores information such as programs and various parameters related to processing executed by the communication device. The RAM 303 is a random access memory that functions as a workspace when the processor 301 executes a program and stores temporary information. The storage device 304 is composed of, for example, a detachable external storage device or the like. The communication circuit 305 includes a circuit for wireless communication. Although one communication circuit 305 is shown in FIG. 3, the communication device may have a plurality of communication circuits.
　図４に、送信装置の機能構成例を示す。送信装置は、例えば、変調符号化部４０１、フレーム制御部４０２、ブランクフレーム制御部４０３、ブランクフレーム設定部４０４、および、ＲＦ部４０５を有する。これらの機能は、例えば、通信回路３０５に組み込まれたプロセッサが所定のプログラムを実行することにより実現されうる。なお、これらの機能の一部が、例えばプロセッサ３０１がＲＯＭ３０２等に記憶されたプログラムを実行することによって実現されてもよい。また、図４は、送信装置の機能を概念的に示したものであり、図４に示すような機能分担が行われる必要はない。なお、送信装置は、例えば、基地局装置１０１および端末装置１０２の両方に実装される。 FIG. 4 shows an example of the functional configuration of the transmitter. The transmission device includes, for example, a modulation coding unit 401, a frame control unit 402, a blank frame control unit 403, a blank frame setting unit 404, and an RF unit 405. These functions can be realized, for example, by the processor incorporated in the communication circuit 305 executing a predetermined program. It should be noted that some of these functions may be realized, for example, by the processor 301 executing a program stored in the ROM 302 or the like. Further, FIG. 4 conceptually shows the functions of the transmission device, and it is not necessary to divide the functions as shown in FIG. The transmitting device is mounted on both the base station device 101 and the terminal device 102, for example.
　変調符号化部４０１は、送信データ系列を誤り訂正符号化し、符号化されたビット列を変調して出力する。フレーム制御部４０２は、変調されたシンボル系列を取得し、そのシンボル系列をフレーム内にマッピングして、送信データ系列を送信するための送信対象フレームを生成する。ブランクフレーム制御部４０３は、受信装置との通信中のフレームの中で事前に定められたタイミング及び数のフレームをブランクフレームとするための制御を実行する。例えば、ブランクフレーム制御部４０３が、フレーム制御部４０２にブランクフレームとすべきフレームのフレーム番号を出力し、フレーム制御部４０２は、そのフレーム番号のフレームについては、無信号期間や、制御信号及び参照信号のみの送信とすることによって、データを含まないブランクフレームを出力する。すなわち、フレーム制御部４０２は、ブランクフレームにおいては、変調符号化部４０１の出力シンボル系列のマッピングを行わない。ブランクフレーム設定部４０４は、ブランクフレームを生成するか否かの決定、ブランクフレームのタイミングや長さの設定などを行う。なお、定期的にブランクフレームが設定されることが事前に取り決められている場合は、ブランクフレーム設定部４０４は省略されてもよい。ブランクフレーム設定部４０４は、上述のように、例えば無線品質に基づいてブランクフレームを生成するか否かを決定する。また、ブランクフレーム設定部４０４は、例えば、他システムからの干渉信号のフレーム長と、自装置が送信するフレームのフレーム長とに基づいて、図２Ａ及び図２Ｂを用いて説明したように、ブランクフレームとする期間を決定しうる。ブランクフレーム設定部４０４は、受信装置との間で、決定した設定を共有する。なお、ブランクフレーム設定部４０４は、受信装置から設定を受信して、ブランクフレーム制御部４０３に受け渡してもよい。ＲＦ部４０５は、生成されたフレームについて一般的な送信機が実行する各種処理を実行してＲＦ信号の形式に変換して送信する。 The modulation coding unit 401 error-corrects and encodes the transmission data series, modulates the coded bit string, and outputs the code. The frame control unit 402 acquires the modulated symbol sequence, maps the symbol sequence within the frame, and generates a transmission target frame for transmitting the transmission data series. The blank frame control unit 403 executes control for setting a predetermined timing and number of frames as blank frames in the frames during communication with the receiving device. For example, the blank frame control unit 403 outputs the frame number of the frame to be a blank frame to the frame control unit 402, and the frame control unit 402 describes the no-signal period, the control signal, and the reference for the frame of the frame number. By transmitting only the signal, a blank frame containing no data is output. That is, the frame control unit 402 does not map the output symbol sequence of the modulation coding unit 401 in the blank frame. The blank frame setting unit 404 determines whether or not to generate a blank frame, sets the timing and length of the blank frame, and the like. If it is agreed in advance that a blank frame is set periodically, the blank frame setting unit 404 may be omitted. As described above, the blank frame setting unit 404 determines whether or not to generate a blank frame based on, for example, radio quality. Further, the blank frame setting unit 404 is blank as described with reference to FIGS. 2A and 2B based on, for example, the frame length of the interference signal from another system and the frame length of the frame transmitted by the own device. The period to be framed can be determined. The blank frame setting unit 404 shares the determined setting with the receiving device. The blank frame setting unit 404 may receive the setting from the receiving device and pass it to the blank frame control unit 403. The RF unit 405 executes various processes executed by a general transmitter on the generated frame, converts it into an RF signal format, and transmits the RF signal.
　図５に、受信装置の機能構成例を示す。受信装置は、例えば、ＲＦ部５０１、自システム信号処理部５１１、他システム信号処理部５２１、ブランクフレーム制御部５３１、および、ブランクフレーム設定部５３２を含む。自システム信号処理部５１１は、復調部５１２、チャネル推定部５１３、および復号部５１４を含む。他システム信号処理部５２１は、復調部５２２、チャネル推定部５２３、復号部５２４、およびレプリカ生成部５２５を含む。これらの機能は、例えば、通信回路３０５に組み込まれたプロセッサが所定のプログラムを実行することにより実現されうる。なお、これらの機能の一部が、例えばプロセッサ３０１がＲＯＭ３０２等に記憶されたプログラムを実行することによって実現されてもよい。また、図５は、受信装置の機能を概念的に示したものであり、図５に示すような機能分担が行われる必要はない。なお、受信装置は、例えば、基地局装置１０１および端末装置１０２の両方に実装される。 FIG. 5 shows an example of the functional configuration of the receiving device. The receiving device includes, for example, an RF unit 501, a local system signal processing unit 511, another system signal processing unit 521, a blank frame control unit 531 and a blank frame setting unit 532. The own system signal processing unit 511 includes a demodulation unit 512, a channel estimation unit 513, and a decoding unit 514. The other system signal processing unit 521 includes a demodulation unit 522, a channel estimation unit 523, a decoding unit 524, and a replica generation unit 525. These functions can be realized, for example, by the processor incorporated in the communication circuit 305 executing a predetermined program. It should be noted that some of these functions may be realized, for example, by the processor 301 executing a program stored in the ROM 302 or the like. Further, FIG. 5 conceptually shows the functions of the receiving device, and it is not necessary to divide the functions as shown in FIG. The receiving device is mounted on both the base station device 101 and the terminal device 102, for example.
　ＲＦ部５０１は、受信したＲＦ信号に対して一般的な送信機が実行する各種処理を実行して、例えばベースバンドの波形を出力する。この波形は、例えば、他システム信号処理部５２１と、（例えば遅延器を介して）加算器５０２に入力される。他システム信号処理部５２１の復調部５２２は、入力された波形に基づいて、干渉信号の復調を行う。この復調は、チャネル推定部５２３によって推定されたチャネル推定値を用いて実行される。チャネル推定値を用いた復調方法については、例えば波形を示す値をチャネル推定値により除算する方法を用いてもよいし他の当業者に知られた一般的な手法を用いてもよい。チャネル推定部５２３は、干渉信号のチャネルを推定する。例えば、チャネル推定部５２３は、他システムの信号の参照信号が存在する時間・周波数位置を事前に把握しておき、その位置における受信信号の値に基づいて、干渉信号のチャネル推定を行う。なお、本実施形態では、チャネル推定部５２３は、例えば、ブランクフレームの期間においてのみ、干渉信号のチャネル推定を行うようにしうる。これにより、高精度なチャネル推定値を得ることができ、復調部５２２による復調の精度も向上させることができる。なお、この場合、チャネル推定部５２３は、直前のブランクフレームの間に推定したチャネル推定値を、次のブランクレームにおいてチャネルを推定するまで保持しておくようにしうる。これにより、ブランクフレーム以外の期間にチャネル推定を行うことによるチャネル推定値の精度劣化を防ぐことができる。復調部５２２による復調で得られたビット列は、復号部５２４に入力され、そのビット列に対して誤り訂正復号が実行される。復号部５２４の復号の結果は、レプリカ生成部５２５に入力される。レプリカ生成部５２５は、復号の結果得られたビット列を、送信装置が用いたのと同じ符号化方式を用いて誤り訂正符号化し、その誤り訂正符号化された系列を変調する。そして、レプリカ生成部５２５は、変調されたシンボル系列に対してチャネル推定部５２３で推定されたチャネル推定値を乗算することにより、干渉信号のレプリカを生成する。生成されたレプリカは加算器５０２へ入力される。 The RF unit 501 executes various processes executed by a general transmitter on the received RF signal, and outputs, for example, a baseband waveform. This waveform is input to, for example, another system signal processing unit 521 and the adder 502 (via, for example, a delayer). The demodulation unit 522 of the other system signal processing unit 521 demodulates the interference signal based on the input waveform. This demodulation is performed using the channel estimates estimated by the channel estimation unit 523. As the demodulation method using the channel estimated value, for example, a method of dividing the value indicating the waveform by the channel estimated value may be used, or a general method known to those skilled in the art may be used. The channel estimation unit 523 estimates the channel of the interference signal. For example, the channel estimation unit 523 grasps in advance the time / frequency position where the reference signal of the signal of another system exists, and estimates the channel of the interference signal based on the value of the received signal at that position. In the present embodiment, the channel estimation unit 523 may, for example, perform channel estimation of the interference signal only during the blank frame period. As a result, a highly accurate channel estimate can be obtained, and the accuracy of demodulation by the demodulation unit 522 can also be improved. In this case, the channel estimation unit 523 may hold the channel estimation value estimated during the immediately preceding blank frame until the channel is estimated in the next blank claim. As a result, it is possible to prevent the accuracy of the channel estimation value from being deteriorated by performing the channel estimation during a period other than the blank frame. The bit string obtained by demodulation by the demodulation unit 522 is input to the decoding unit 524, and error correction decoding is executed for the bit string. The decoding result of the decoding unit 524 is input to the replica generation unit 525. The replica generation unit 525 error-corrects and encodes the bit string obtained as a result of decoding using the same coding method used by the transmission device, and modulates the error-correction-encoded sequence. Then, the replica generation unit 525 generates a replica of the interference signal by multiplying the modulated symbol sequence by the channel estimation value estimated by the channel estimation unit 523. The generated replica is input to the adder 502.
　加算器５０２では、タイミングがそろえられた受信信号と干渉信号のレプリカとが入力され、受信信号から干渉信号が減算された結果の波形が出力される。復調部５１２は、この波形に対して復調処理を実行する。なお、この復調処理の際には、チャネル推定部５１３によって推定されたチャネル推定値が用いられる。チャネル推定部５１３は、希望信号の参照信号が送信されている時間・周波数の位置の、受信信号から干渉信号が減算された結果の波形を抽出して、チャネル推定値を取得する。このとき、レプリカ生成部５２５によって生成されたレプリカ信号が高精度であれば、干渉信号成分が高精度に除去されるため、高精度にチャネル推定を行うことができ、復調部５１２における復調精度も向上させることができる。最終的に、復調部５１２による復調で得られたビット列は、復号部５１４へ入力され、誤り訂正復号が行われて、希望信号のデータが抽出される。なお、復号後のデータに対してはＣＲＣチェックなどが実行され、必要に応じてＨＡＲＱの再送要求やＡＣＫの送信が行われる。 In the adder 502, the received signal with the same timing and the replica of the interference signal are input, and the waveform resulting from the subtraction of the interference signal from the received signal is output. The demodulation unit 512 executes demodulation processing on this waveform. In this demodulation process, the channel estimation value estimated by the channel estimation unit 513 is used. The channel estimation unit 513 extracts the waveform obtained by subtracting the interference signal from the received signal at the position of the time and frequency at which the reference signal of the desired signal is transmitted, and acquires the channel estimation value. At this time, if the replica signal generated by the replica generation unit 525 has high accuracy, the interference signal component is removed with high accuracy, so that channel estimation can be performed with high accuracy, and the demodulation accuracy in the demodulation unit 512 is also high. Can be improved. Finally, the bit string obtained by the demodulation by the demodulation unit 512 is input to the decoding unit 514, error correction decoding is performed, and the data of the desired signal is extracted. A CRC check or the like is executed on the decrypted data, and a HARQ retransmission request or an ACK transmission is performed as necessary.
　ブランクフレーム制御部５３１は、送信装置がブランクフレームとして設定したフレームにおいて、他システム信号処理部５２１のチャネル推定部５２３のみが動作するようにして、自システム信号処理部５１１や他システム信号処理部５２１のチャネル推定部５２３以外の機能部が動作しないように制御を行う。これにより、チャネル推定部５２３による干渉信号のチャネル推定精度を向上させることができる。 The blank frame control unit 531 makes only the channel estimation unit 523 of the other system signal processing unit 521 operate in the frame set as the blank frame by the transmitting device, so that the own system signal processing unit 511 and the other system signal processing unit 521 operate. Control is performed so that the functional units other than the channel estimation unit 523 of the above do not operate. As a result, the channel estimation accuracy of the interference signal by the channel estimation unit 523 can be improved.
　ブランクフレーム設定部５３２は、ブランクフレームを送信装置に生成させるか否かの決定、ブランクフレームのタイミングや長さの設定などを行う。なお、定期的にブランクフレームが設定されることが事前に取り決められている場合は、ブランクフレーム設定部５３２は省略されてもよい。ブランクフレーム設定部５３２は、上述のように、例えば無線品質に基づいてブランクフレームを送信装置に生成させるか否かを決定する。また、ブランクフレーム設定部５３２は、例えば、他システムからの干渉信号のフレーム長と、自装置が受信するフレームのフレーム長とに基づいて、図２Ａ及び図２Ｂを用いて説明したように、ブランクフレームとする期間を決定しうる。ブランクフレーム設定部５３２は、送信装置との間で、決定した設定を共有する。なお、ブランクフレーム設定部５３２は、送信装置から設定を受信して、ブランクフレーム制御部５３１に受け渡してもよい。 The blank frame setting unit 532 determines whether or not to generate a blank frame in the transmission device, sets the timing and length of the blank frame, and the like. If it is agreed in advance that a blank frame is set periodically, the blank frame setting unit 532 may be omitted. As described above, the blank frame setting unit 532 determines whether or not to cause the transmitter to generate a blank frame based on, for example, radio quality. Further, the blank frame setting unit 532 is blank as described with reference to FIGS. 2A and 2B based on, for example, the frame length of the interference signal from another system and the frame length of the frame received by the own device. The period to be framed can be determined. The blank frame setting unit 532 shares the determined setting with the transmitting device. The blank frame setting unit 532 may receive the setting from the transmission device and pass it to the blank frame control unit 531.
　（処理の流れ）
　図６を用いて、送信装置によって実行される処理の流れの例について概説する。なお、各処理の詳細については上述の通りであるため、ここでは説明を繰り返さない。 (Processing flow)
An example of a processing flow executed by the transmitting device will be outlined with reference to FIG. Since the details of each process are as described above, the description will not be repeated here.
　まず、送信装置は、ブランクフレームの設定を実行する（Ｓ６０１）。例えば、受信装置との間で設定に関する情報を通信することにより、送信装置と受信装置とで共通の設定が認識されるようにする。なお、事前に設定が決定されている場合などは、Ｓ６０１の処理は省略されうる。また、図６の例では、一度設定がなされた後は、Ｓ６０１の処理が実行されないような例を示しているが、この設定は例えば定期的に実行されてもよい。送信装置は、受信装置と接続して通信を行っている際に、これから送信するフレームがブランクフレームとして設定されているかを判定する（Ｓ６０２）。送信装置は、ブランクフレームとして設定されているフレームに対して（Ｓ６０２でＹＥＳ）、ユーザデータを含まないブランクフレームを生成し（Ｓ６０３）、ブランクフレームとして設定されていないフレームに対して（Ｓ６０２でＮＯ）、ユーザデータを含んだデータフレームを生成する（Ｓ６０４）。そして、送信装置は、生成したフレームを送信する（Ｓ６０５）。その後、送信装置は、例えば受信装置との接続が切断されるまで、同様の処理を繰り返し実行しうる。 First, the transmitting device executes the setting of the blank frame (S601). For example, by communicating information about the settings with the receiving device, the common settings are recognized by the transmitting device and the receiving device. If the setting is determined in advance, the process of S601 may be omitted. Further, in the example of FIG. 6, an example is shown in which the process of S601 is not executed once the setting is made, but this setting may be executed periodically, for example. The transmitting device determines whether the frame to be transmitted is set as a blank frame when communicating with the receiving device (S602). The transmitting device generates a blank frame containing no user data (S603) for a frame set as a blank frame (YES in S602), and NO for a frame not set as a blank frame (NO in S602). ), A data frame including user data is generated (S604). Then, the transmitting device transmits the generated frame (S605). After that, the transmitting device can repeatedly execute the same process until, for example, the connection with the receiving device is disconnected.
　続いて、図７を用いて、受信装置によって実行される処理の流れの例について概説する。なお、各処理の詳細については上述の通りであるため、ここでは説明を繰り返さない。 Subsequently, with reference to FIG. 7, an example of a processing flow executed by the receiving device will be outlined. Since the details of each process are as described above, the description will not be repeated here.
　まず、受信装置は、ブランクフレームの設定を実行する（Ｓ７０１）。例えば、送信装置との間で設定に関する情報を通信することにより、送信装置と受信装置とで共通の設定が認識されるようにする。なお、事前に設定が決定されている場合などは、Ｓ７０１の処理は省略されうる。また、図７の例では、一度設定がなされた後は、Ｓ７０１の処理が実行されないような例を示しているが、この設定は例えば定期的に実行されてもよい。 First, the receiving device executes the setting of the blank frame (S701). For example, by communicating information about the settings with the transmitting device, the common settings are recognized by the transmitting device and the receiving device. If the setting is determined in advance, the process of S701 may be omitted. Further, in the example of FIG. 7, an example is shown in which the process of S701 is not executed once the setting is made, but this setting may be executed periodically, for example.
　受信装置は、受信した無線信号について、例えば希望信号のフレーム番号などに基づいて、現在受信しているフレームがブランクフレームとして設定されたフレームであるかを判定する（Ｓ７０２）。そして、受信装置は、そのフレームがブランクフレームである期間において（Ｓ７０２でＹＥＳ）、干渉信号のチャネル推定を実行する（Ｓ７０３）。一方、受信装置は、ブランクフレーム以外の期間においては、例えば、Ｓ７０３で推定されたチャネル推定値に基づいて干渉信号の復調・復号を実行し（Ｓ７０４）、その結果とチャネル推定値を用いて干渉信号のレプリカを生成する（Ｓ７０５）。そして、受信装置は、受信信号から、生成したレプリカ信号を減算し（Ｓ７０６）、減算後の信号から、希望信号の復調・復号を行う（Ｓ７０７）。 The receiving device determines whether the currently received frame is a frame set as a blank frame with respect to the received wireless signal, for example, based on the frame number of the desired signal (S702). Then, the receiving device executes channel estimation of the interference signal during the period when the frame is a blank frame (YES in S702) (S703). On the other hand, in the period other than the blank frame, the receiving device executes demodulation / decoding of the interference signal based on the channel estimated value estimated in S703 (S704), and interferes using the result and the channel estimated value. Generate a replica of the signal (S705). Then, the receiving device subtracts the generated replica signal from the received signal (S706), and demodulates / decodes the desired signal from the subtracted signal (S707).
　なお、本実施形態では、干渉信号が先に復調・復号される例を示しているが、これに限られない。例えば、希望信号と干渉信号の電力を比較して、その電力比に基づいて、先に復調・復号が行われる信号を決定してもよい。この場合、例えば、希望信号が復調・復号された後に、希望信号のレプリカが生成され、受信信号から減算される。そして、その減算後の信号に対して、Ｓ７０３で推定したチャネル推定値を用いて干渉信号の復調・復号を行う。そして、その干渉信号のレプリカを生成して、受信信号から減算し、その減算結果に基づいて、再度、希望信号の復調・復号を行う。このように、繰り返し処理が実行される場合は、干渉信号が先に復調・復号される必要はない。 Note that this embodiment shows an example in which the interference signal is demodulated / decoded first, but the present invention is not limited to this. For example, the powers of the desired signal and the interference signal may be compared, and the signal to be demodulated / decoded first may be determined based on the power ratio. In this case, for example, after the desired signal is demodulated / decoded, a replica of the desired signal is generated and subtracted from the received signal. Then, with respect to the subtracted signal, the interference signal is demodulated / decoded using the channel estimated value estimated in S703. Then, a replica of the interference signal is generated, subtracted from the received signal, and the desired signal is demodulated / decoded again based on the subtraction result. In this way, when the iterative processing is executed, it is not necessary for the interference signal to be demodulated / decoded first.
　以上のようにして、ブランクフレームを設定し、受信装置において干渉信号だけが受信される期間を設けることにより、干渉信号のチャネル推定とレプリカとを高精度化することができ、受信信号から干渉信号の影響を高精度に除去することが可能となる。 By setting a blank frame as described above and providing a period during which only the interference signal is received in the receiving device, it is possible to improve the accuracy of the channel estimation of the interference signal and the replica, and the interference signal from the received signal can be improved. It is possible to remove the influence of the above with high accuracy.
　発明は上記の実施形態に制限されるものではなく、発明の要旨の範囲内で、種々の変形・変更が可能である。 The invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the gist of the invention.
　本願は、２０２０年３月１７日提出の日本国特許出願特願２０２０－０４６２４５を基礎として優先権を主張するものであり、その記載内容の全てを、ここに援用する。 This application claims priority based on Japanese Patent Application No. 2020-046245 submitted on March 17, 2020, and all the contents thereof are incorporated herein by reference.

Claims (15)

  1. 　送信装置から送信された信号を受信する受信装置であって、
    　信号を受信する受信手段と、
    　前記送信装置との間での通信中のフレームにおいて、データを含まないブランクフレームの設定を行う設定手段と、
    　前記ブランクフレームに対応する期間において他のシステムの信号のチャネルを推定する推定手段と、
    　前記チャネルに基づいて、前記受信手段において受信した信号に含まれる前記他のシステムからの干渉成分を除去する除去手段と、
    　前記干渉成分が除去された信号に基づいて、前記送信装置から送信されたデータの復調を行う復調手段と、
    　を有する受信装置。     A receiving device that receives a signal transmitted from a transmitting device.
    The receiving means for receiving the signal and
    A setting means for setting a blank frame that does not include data in a frame during communication with the transmission device, and
    An estimation means for estimating the signal channel of another system in the period corresponding to the blank frame, and
    A removing means for removing interference components from the other system contained in the signal received by the receiving means based on the channel.
    A demodulation means that demodulates the data transmitted from the transmission device based on the signal from which the interference component has been removed, and
    Receiver with.
  2. 　前記設定手段は、前記送信装置から送信された信号の無線品質に基づいて、前記ブランクフレームを設定する、請求項１に記載の受信装置。 The receiving device according to claim 1, wherein the setting means sets the blank frame based on the radio quality of the signal transmitted from the transmitting device.
  3. 　前記無線品質は、前記送信装置からの信号の受信成功率に基づく、請求項２に記載の受信装置。 The receiving device according to claim 2, wherein the radio quality is based on a reception success rate of a signal from the transmitting device.
  4. 　前記設定手段は、前記送信装置から送信される信号のフレームと、前記他のシステムからの信号のフレームとのうちの長い方のフレームが２つ分以上の長さの前記ブランクフレームを設定する、請求項１から３のいずれか１項に記載の受信装置。 The setting means sets the blank frame having a length of two or more frames of a signal transmitted from the transmitting device and a frame of a signal from the other system, whichever is longer. The receiving device according to any one of claims 1 to 3.
  5. 　前記設定手段は、前記ブランクフレームの設定のための制御信号を前記送信装置との間で通信する、請求項１から４のいずれか１項に記載の受信装置。 The receiving device according to any one of claims 1 to 4, wherein the setting means communicates a control signal for setting the blank frame with the transmitting device.
  6. 　受信装置へ信号を送信する送信装置であって、
    　前記受信装置において除去されるべき他のシステムからの信号について前記受信装置がチャネルを推定するために用いられる、前記受信装置との間での通信中のフレームにおいてデータを含まないブランクフレームの設定を行う設定手段と、
    　前記ブランクフレームにおいて信号を送信せず、当該ブランクフレームを除くフレームにおいて前記受信装置へ信号を送信する送信手段と、
    　を有する送信装置。     A transmitter that transmits a signal to a receiver
    Setting a blank frame that does not contain data in the frame being communicated with the receiver that the receiver uses to estimate the channel for signals from other systems that should be removed in the receiver. Setting means to be performed and
    A transmission means that does not transmit a signal in the blank frame but transmits a signal to the receiving device in a frame other than the blank frame.
    Transmitter with.
  7. 　前記設定手段は、前記送信手段によって送信された信号の前記受信装置における無線品質に基づいて、前記ブランクフレームを設定する、請求項６に記載の送信装置。 The transmitting device according to claim 6, wherein the setting means sets the blank frame based on the radio quality of the signal transmitted by the transmitting means in the receiving device.
  8. 　前記無線品質は、前記送信手段からの信号の前記受信装置における受信成功率に基づく、請求項７に記載の送信装置。 The transmitting device according to claim 7, wherein the radio quality is based on a reception success rate of a signal from the transmitting means in the receiving device.
  9. 　前記無線品質は、複数の前記受信装置へそれぞれ送信された信号について、当該複数の前記受信装置のうち受信に成功した当該受信装置の数に基づく、請求項７に記載の送信装置。 The transmission device according to claim 7, wherein the radio quality is based on the number of the receiving devices that have succeeded in receiving the signals transmitted to the plurality of receiving devices, respectively.
  10. 　前記設定手段は、前記送信手段によって送信される信号のフレームと、前記受信装置において除去されるべき他のシステムからの信号のフレームとのうちの長い方のフレームが２つ分以上の長さの期間として前記ブランクフレームを設定する、請求項６から９のいずれか１項に記載の送信装置。 The setting means has a length of two or more frames of a signal transmitted by the transmitting means and a frame of a signal from another system to be removed by the receiving device, whichever is longer. The transmitting device according to any one of claims 6 to 9, wherein the blank frame is set as a period.
  11. 　前記設定手段は、前記ブランクフレームの設定のための制御信号を前記受信装置との間で通信する、請求項６から１０のいずれか１項に記載の送信装置。 The transmitting device according to any one of claims 6 to 10, wherein the setting means communicates a control signal for setting the blank frame with the receiving device.
  12. 　送信装置から送信された信号を受信する受信装置によって実行される通信方法であって、
    　前記送信装置との間での通信中のフレームにおいて、データを含まないブランクフレームの設定を行うことと、
    　前記ブランクフレームに対応する期間において他のシステムの信号のチャネルを推定することと、
    　前記チャネルに基づいて、受信した信号に含まれる前記他のシステムからの干渉成分を除去することと、
    　前記干渉成分が除去された信号に基づいて、前記送信装置から送信されたデータの復調を行うことと、
    　を含む通信方法。     A communication method performed by a receiving device that receives a signal transmitted from the transmitting device.
    Setting a blank frame that does not include data in the frame during communication with the transmitter
    Estimating the signal channels of other systems during the period corresponding to the blank frame,
    To remove the interfering components from the other system contained in the received signal based on the channel.
    Demodulating the data transmitted from the transmitter based on the signal from which the interference component has been removed, and
    Communication methods including.
  13. 　受信装置へ信号を送信する送信装置によって実行される通信方法であって、
    　前記受信装置において除去されるべき他のシステムからの信号について前記受信装置がチャネルを推定するために用いられる、前記受信装置との間での通信中のフレームにおいてデータを含まないブランクフレームの設定を行うことと、
    　前記ブランクフレームにおいて信号を送信せず、当該ブランクフレームを除くフレームにおいて前記受信装置へ信号を送信することと、
    　を含む通信方法。     A communication method performed by a transmitting device that transmits a signal to a receiving device.
    Setting a blank frame that does not contain data in the frame being communicated with the receiver that the receiver uses to estimate the channel for signals from other systems that should be removed in the receiver. To do and
    Not transmitting a signal in the blank frame, but transmitting a signal to the receiving device in a frame other than the blank frame.
    Communication methods including.
  14. 　送信装置から送信された信号を受信する受信装置に備えられたコンピュータに、
    　前記送信装置との間での通信中のフレームにおいて、データを含まないブランクフレームの設定を行わせ、
    　前記ブランクフレームに対応する期間において他のシステムの信号のチャネルを推定させ、
    　前記チャネルに基づいて、受信した信号に含まれる前記他のシステムからの干渉成分を除去させ、
    　前記干渉成分が除去された信号に基づいて、前記送信装置から送信されたデータの復調を行わせる、
    　ためのプログラム。     To the computer provided in the receiving device that receives the signal transmitted from the transmitting device,
    In the frame during communication with the transmitting device, a blank frame that does not include data is set.
    The signal channels of other systems are estimated during the period corresponding to the blank frame.
    Based on the channel, the interfering component from the other system contained in the received signal is removed.
    Based on the signal from which the interference component has been removed, the data transmitted from the transmitter is demodulated.
    Program for.
  15. 　受信装置へ信号を送信する送信装置に備えられたコンピュータに、
    　前記受信装置において除去されるべき他のシステムからの信号について前記受信装置がチャネルを推定するために用いられる、前記受信装置との間での通信中のフレームにおいてデータを含まないブランクフレームの設定を行わせ、
    　前記ブランクフレームにおいて信号を送信せず、当該ブランクフレームを除くフレームにおいて前記受信装置へ信号を送信させる、
    　ためのプログラム。     To a computer equipped with a transmitter that sends a signal to the receiver
    Setting a blank frame that does not contain data in the frame being communicated with the receiver that the receiver uses to estimate the channel for signals from other systems that should be removed in the receiver. Let me do
    The signal is not transmitted in the blank frame, and the signal is transmitted to the receiving device in the frame other than the blank frame.
    Program for.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109540A1 (en) * 2009-03-27 2010-09-30 富士通株式会社 Wireless communication method, mobile station, base station, and wireless communication system
JP2018117335A (en) * 2017-01-19 2018-07-26 パナソニック株式会社 Base station, terminal, wireless communication system, and communication method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109540A1 (en) * 2009-03-27 2010-09-30 富士通株式会社 Wireless communication method, mobile station, base station, and wireless communication system
JP2018117335A (en) * 2017-01-19 2018-07-26 パナソニック株式会社 Base station, terminal, wireless communication system, and communication method

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