WO2011055535A1 - 無線通信システムの制御方法、無線通信システム、及び無線通信装置 - Google Patents
無線通信システムの制御方法、無線通信システム、及び無線通信装置 Download PDFInfo
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- WO2011055535A1 WO2011055535A1 PCT/JP2010/006470 JP2010006470W WO2011055535A1 WO 2011055535 A1 WO2011055535 A1 WO 2011055535A1 JP 2010006470 W JP2010006470 W JP 2010006470W WO 2011055535 A1 WO2011055535 A1 WO 2011055535A1
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/373—Predicting channel quality or other radio frequency [RF] parameters
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
Definitions
- the present invention relates to a system for performing wireless communication by adaptively controlling a radio beam and a control method therefor.
- millimeter-wave wireless technology is expected to be applied particularly to high-definition image wireless transmission and gigabit-class high-speed data wireless communication (for example, see Non-Patent Documents 1, 2, and 3).
- millimeter waves with a high frequency have a strong straight-line property, and there are problems when assuming indoor wireless transmission.
- signal attenuation is significant due to the human body, etc., and if a person is present between the transmitter and the receiver in a room, transmission becomes difficult due to out-of-sight (shadowing) problem).
- This problem is due to the result of the propagation environment changing as the frequency increases and the straightness of radio waves becomes stronger, and is not limited to the millimeter wave band (30 GHz or higher).
- the frequency at which the radio wave propagation environment changes cannot be clearly specified, but it is said to be around 10 GHz.
- the power loss coefficient (power loss ⁇ ⁇ coefficients) representing the attenuation of radio waves with respect to the distance during propagation is 28-32 at 0.9-5.2 GHz in the office, at 60 GHz. Is 22. Since the free space loss is 20, it is considered that the influence of scattering and diffraction is small at a high frequency such as 60 GHz.
- a plurality of transmission paths are provided by installing a plurality of reception units in the reception apparatus, and one of the transmission paths between the transmission apparatus and the reception section is shielded.
- a system that continues transmission on the other transmission path is described in Patent Document 2.
- Patent Document 2 cannot be used when the vicinity of the transmission device is shielded or when a plurality of receiving units are shielded. Further, in the method described in Patent Document 3, it is necessary to request special consideration from the user, for example, it is necessary to install a reflector in consideration of the arrangement of the transmitter and the receiver.
- FIG. 26 is a diagram showing a configuration of a system using a wide-angle antenna
- FIG. 27 is a diagram showing an example of a delay profile in the room of the system using the wide-angle antenna as shown in FIG.
- the received power of the main wave that arrives first is the largest.
- delayed waves such as the second wave and the third wave arrive, but the received power is small.
- These second wave and third wave are reflected waves from the ceiling and the wall.
- This situation is significantly different from the propagation environment of radio waves with weak straightness such as the 2.4 GHz band used in, for example, a wireless LAN (Local Area Network).
- 2.4 GHz it is difficult to clearly separate the arrival directions of radio waves due to diffraction effects and multiple reflection.
- the arrival direction of the radio wave is relatively clear, but the number of delayed waves is limited and the reception level is small.
- the reception level is directed toward the direction of reflecting the narrow beam having a high directivity gain.
- beamforming (directivity control) technology that dynamically controls a narrow beam is indispensable in order to eliminate the need for special considerations regarding the presence or absence of shielding and the relative position of the transmitter and receiver. It becomes.
- a typical example is a phased array antenna.
- a phased array antenna For millimeter waves with a short wavelength (for example, 5 mm at a frequency of 60 GHz), a phased array antenna can be realized in a small area, and phase shifter arrays and oscillator arrays have been developed for this purpose (for example, see Non-Patent Documents 3 and 4). ).
- directivity control can be realized even when an antenna such as a sector switching antenna or a mechanical direction movable antenna is used.
- a direction-of-arrival estimation technique is known as a technique different from the beam forming using the antenna array.
- the arrival direction estimation technique is a technique used in radar, sonar, propagation environment measurement, and the like, and is used for accurately estimating the arrival direction and power of radio waves received by an antenna array.
- an omni (omnidirectional) antenna is often used for the radio wave source.
- Non-Patent Document 6 shows such an example.
- the narrower the beam width the greater the search direction (step). For this reason, since it takes time to search for the beam direction and set the optimum beam direction, the transmission interruption time becomes long. Therefore, in such a case, a beam direction setting method that can shorten the transmission interruption time is strongly desired. Note that even a device capable of buffering data is not practical because a very large memory is required if the transmission interruption time becomes long.
- the characteristics of the propagation path between communication devices are expressed by a channel response matrix. If this channel response matrix is obtained, it is known that the best combination of transmitter and receiver antenna settings (hereinafter referred to as an antenna setting pair) can be obtained using singular value decomposition (SVD: -Single-Value Decomposition). .
- SVD singular value decomposition
- SVD is complicated and requires a long processing time, it is difficult to implement it in, for example, an uncompressed image transmission apparatus that requires high speed.
- a unitary matrix for example, a Hadamard matrix
- a unitary matrix for example, a Hadamard matrix
- a method for determining an optimal AWV array weight vector
- this method can shorten the time as compared with SVD, it takes a predetermined time to obtain an optimal AWV combination in order to repeatedly switch between transmission and reception.
- Non-Patent Document 5 discloses a technique for optimizing the beam direction (antenna setting) for transmission and reception while gradually increasing the beam resolution.
- it is necessary to measure the communication quality for a combination of a large number of transmission and reception beam directions (antenna settings) while repeatedly switching between transmission and reception, and a great deal of time is required to find the optimum beam combination. It was necessary.
- the pseudo omni pattern refers to a pattern having a substantially constant antenna gain over a very wide direction in the space around the transmitter / receiver, although it is not a complete omni (non-directional). Since it is often difficult to obtain a complete omni pattern in an antenna array, this pseudo omni pattern is often substituted. Furthermore, in the millimeter wave band, it may be difficult to obtain a good pseudo omni pattern.
- a good pseudo omni pattern refers to a wide or desired radiation pattern with sufficiently small antenna gain variation over an angular range.
- the present invention has been made in view of the above-described problems, and when performing wireless communication by performing beamforming, the time required for searching and setting the beam direction (antenna setting) is shortened, and transmission interruption is caused.
- An object of the present invention is to provide a radio control method capable of shortening the time that occurs.
- the method according to the first aspect of the present invention is a method for controlling a wireless communication system including first and second communication devices.
- the first communication device can control the transmission beam direction of the first transmission antenna by changing the transmission antenna setting, and can change the reception beam direction of the first reception antenna by changing the reception antenna setting. It is configured to be controllable.
- the second communication device can control the transmission beam direction of the second transmission antenna by changing the transmission antenna setting, and can control the reception beam direction of the second reception antenna by changing the reception antenna setting. It is configured to be able to.
- the method according to this aspect includes the following steps (a) to (k).
- determining at least one second transmission antenna setting candidate for the second transmission antenna to be used for communication (F): transmitting a training signal from the first transmission antenna in a state where a fixed beam pattern is set in the first transmission antenna; (G): receiving the training signal at the second receiving antenna while changing the antenna setting of the second receiving antenna; (H): obtaining a data string describing the relationship between the antenna setting of the second reception antenna and the reception signal characteristics based on the reception result of the training signal in the step (g); (I): determining at least one second reception antenna setting candidate to be used for communication of the second reception antenna using the data string; (J): Steps (f) to (i) performed using the first transmission antenna and the second reception antenna are performed for a combination of the second transmission antenna and the first reception antenna.
- Determining at least one first receiving antenna setting candidate to be used for communication of the first receiving antenna (K): The combination of the first transmission antenna setting candidate and the second reception antenna setting candidate, and the combination of the first reception antenna setting candidate and the second transmission antenna setting candidate, Use for communication between second communication devices.
- a 2nd aspect of this invention is related with the radio
- the first communication device is configured to be able to transmit a radio signal from a first transmission antenna and to receive a radio signal by the first reception antenna.
- the second communication device is configured to transmit a radio signal from a second transmission antenna and to receive a radio signal by the second reception antenna.
- the first and second communication devices are configured to coordinately perform transmission and reception antenna setting candidate determination processing used for wireless communication.
- the determination process includes the following processes (a) to (k). (A): transmitting a training signal from the first transmission antenna while changing a transmission beam direction by changing an antenna setting of the first transmission antenna.
- Determining at least one transmission antenna setting candidate to be used for communication of the second transmission antenna (F): transmitting a training signal from the first transmission antenna in a state where a fixed beam pattern is set in the first transmission antenna; (G): receiving the training signal at the second receiving antenna while changing a receiving beam direction by changing an antenna setting of the second receiving antenna; (H): obtaining a data string describing a relationship between an antenna setting of the second reception antenna and a reception signal characteristic based on a training signal reception result in the process (g); (I): using the data string acquired in the process (h), determining at least one second reception antenna setting candidate that is a candidate for use in communication of the second reception antenna; (J): A process similar to the processes (f) to (i) for determining the at least one second reception antenna setting candidate is a combination of the second transmission antenna and the first reception antenna.
- Determining at least one first receiving antenna setting candidate to be used for communication of the first receiving antenna (K): The combination of the first transmission antenna setting candidate and the second reception antenna setting candidate, and the combination of the first reception antenna setting candidate and the second transmission antenna setting candidate, Use for communication between second communication devices.
- a third aspect of the present invention relates to a wireless communication apparatus that performs wireless communication with a counterpart apparatus.
- the wireless communication apparatus includes a transmission antenna setting control unit, a reception antenna setting control unit, and a processing unit.
- the transmission antenna setting control unit controls the transmission beam direction of the first transmission antenna by changing the transmission antenna setting.
- the reception antenna setting control unit controls the reception beam direction of the first reception antenna by changing the reception antenna setting.
- the processing unit performs transmission and reception antenna setting candidate determination processing used for wireless communication with the counterpart device in cooperation with the counterpart device.
- the determination process includes the following processes (a) to (c).
- Third training for receiving the third training signal in a state and (ii) the wireless communication device transmits a fourth training signal with the transmission beam pattern fixed, and the counterpart device changes the receiving antenna setting.
- the at least one second for use during transmission of the counterpart device Transmission antenna setting candidates and at least one second reception antenna setting for use during reception by the counterpart device.
- C a combination of the first transmission antenna setting candidate and the second reception antenna setting candidate, and a combination of the first reception antenna setting candidate and the second transmission antenna setting candidate. Applying a combination to wireless communication between the wireless communication device and the counterpart device.
- a 4th aspect of this invention is related with the control method of the radio
- the method includes the following steps (i) to (iii). (i) the first communicator scans the beam direction and transmits a first training signal, and the second communicator receives the first training signal in a fixed beam pattern; Selecting a transmit beam candidate for the first communicator; (ii) the first communicator transmits a second training signal with a fixed beam pattern, and the second communicator scans the beam direction and receives the second training signal; Selecting a reception beam candidate of the second communication device; and (iii) performing training for combining the transmission beam candidate and the reception beam candidate.
- a fifth aspect of the present invention relates to a wireless communication system that performs wireless communication between a first communication device and a second communication device.
- the first and second communication devices are configured to perform a control method including the following steps (i) to (iii) in a coordinated manner.
- the first communicator scans a beam direction and transmits a first training signal, and the second communicator receives the first training signal in a fixed beam pattern;
- the first communicator transmits a second training signal in a fixed beam pattern, the second communicator scans the beam direction and receives the second training signal; and
- the radio communication system includes transceivers 400 and 500 having a directivity control antenna for beamforming.
- the directivity control mechanism of the directivity control antenna included in the transceivers 400 and 500 is not particularly limited.
- the directivity control antennas included in the transceivers 400 and 500 may be phased array antennas, sector switching antennas, or mechanical movable antennas.
- FIG. 2 shows an example of the configuration of a transceiver 400 having a phased array antenna as a directivity control antenna (excluding circuits unnecessary for explanation of operation).
- M transmitting radiating elements and N receiving radiating elements each constitute an antenna array.
- the transmitter 401 includes a transmission circuit 403, and data is input from the outside.
- the output of the transmission circuit 403 is M-branched and input to the antenna setting circuit 404.
- the antenna setting circuit 404 includes AWV (array weight vector) control circuits 404-1 to 404 -M.
- AWV array weight vector
- the AWV control circuits 404-1 to 404 -M can be realized by, for example, a serial connection of an analog phase shifter and a variable gain amplifier. In this case, both the amplitude and phase of the signal are continuously controlled.
- the AWV control circuits 404-1 to 404 -M are realized by digital phase shifters, only the signal phase is discretely controlled.
- the processing / arithmetic circuit 406 instructs the setting of the antenna setting circuit 404 through the control circuit 407.
- the direction and width of the beam emitted from the transmitter can be controlled by changing the amplitude and / or phase given to each signal.
- the receiver 402 has a configuration opposite to that of the transmitter 401.
- the signals received by the receiving antenna array composed of the radiating elements 411-1 to 41-N are combined after the amplitude and / or phase is adjusted by the AWV control circuits 410-1 to 410-N, and are combined via the receiving circuit 409 to the outside.
- Data is output to Similar to the transmitter 401, the processing / arithmetic circuit 406 controls the amplitude and / or phase of each of the AWV control circuits 410-1 to 410-N.
- FIG. 3 is a conceptual diagram of a wireless communication system including two transceivers (400 and 500) having the configuration shown in FIG.
- the transceiver 500 has K transmitting radiation elements and L receiving radiation elements.
- FIGS. 2 and 3 show configuration examples of a communication device equipped with a phased array antenna as a directivity control antenna, but communication devices equipped with other types of antennas as a directivity control antenna are also known.
- FIG. 4 is a configuration example of a transceiver 400 equipped with a sector switching antenna as a directivity control antenna. In this case, elements having strong directivities are used as the transmission radiating elements 415-1 to 415-1 and reception radiating elements 417-1 to 417-1 to 41-N, and the respective radiating elements are arranged in different directions.
- the antenna setting circuits 414 and 416 are usually composed of switch elements 414-1 to M and 416-1 to N. A beam is formed in the radiation direction of the radiating element with the switch turned on. Therefore, the beam direction can be controlled by changing the antenna setting by the antenna setting circuits 414 and 416.
- the operation of the other parts of the circuit is the same as in FIG.
- the transceiver 400 and the transceiver 500 perform training for optimizing the antenna setting circuits 404, 410, 504, and 510 provided therein.
- the processing / arithmetic circuit 406 or 506 or these two circuits cooperate to determine and acquire a plurality of antenna setting pair candidates (antenna setting pair list).
- a method for determining a plurality of antenna setting pair candidates in S12 and S13 will be described later.
- the plurality of antenna setting pair candidates obtained are stored as data strings in the storage circuits 408 and 508 or one of them.
- the antenna setting pair means a combination of the antenna setting for the transmitting antenna and the antenna setting for the receiving antenna.
- the antenna setting may be setting information that defines the directivity pattern (beam direction, beam pattern) of the transmission antenna or the reception antenna.
- the antenna setting may be AWV.
- the antenna setting may be set to ON / OFF setting of the switch elements 414-1 to M and the like.
- the antenna setting may be an identification number associated with a specific directivity in advance, or may be an antenna setting value itself such as AWV that determines directivity.
- one of the plurality of antenna setting pair candidates obtained in S13 is selected, and communication is performed in S15.
- the method of selecting the antenna setting pair in S14 will also be described later.
- the transceivers 400 and 500 monitor the communication state. For example, when the transceiver 500 is operated for reception, the communication quality may be measured by the reception circuit 509 or the processing / arithmetic circuit 506.
- Communication quality includes, for example, reception level, signal power to noise power ratio (SNR), bit error rate (BER), packet error rate (PER), frame error rate. (FER: Frame Error Rate) etc. may be measured.
- the monitoring of the communication state in the transmitter / receiver 400 operated as the transmitter at this time may be performed by measuring the reception status of the communication quality degradation alarm from the transmitter / receiver 500 and the reception status of the reception confirmation response (ACK).
- ACK reception confirmation response
- the transceivers 400 and 500 select another antenna setting pair from the data sequence recorded in the storage circuits 408 and 508 or one of them. (S16).
- the quality of the communication quality may be determined, for example, by measuring the reception level, SNR, etc. in the reception circuit 509 or the processing / arithmetic circuit 506 when the transceiver 500 is operated to receive. If it is determined in S17 that the communication quality is good, the transceivers 400 and 500 return to the communication state (S15). On the other hand, when it is determined in S17 that the communication quality is insufficient, the transceivers 400 and 500 transition to S16 and reselect the antenna setting pair.
- the communication quality is confirmed for all or a part of the antenna setting pairs acquired in S13, and as a result, communication is performed using the antenna setting pairs having good communication quality. It may be in the form of restarting.
- FIG. 1A and 1B are simplified sequence diagrams showing an example of these procedures.
- the transceiver 400 is represented as “communication device 1”
- the transceiver 500 is represented as “communication device 2”.
- the procedure and operation will be described below in conjunction with the simplified sequence diagrams of FIGS. 1A and 1B and the configuration diagram of the wireless communication system of FIG.
- FIGS. 11 shows a case where the training signal propagates from the communication device 1 toward the communication device 2, and FIG. 12 shows the opposite case.
- the communication device 1, the communication device 2, and the reflector 62 are installed in a room (two-dimensional) surrounded by a wall 61. Assume that there are four paths indicated by signals 1 to 4 that can be used for communication between the communication device 1 and the communication device 2.
- Steps S102-1 and S102-2 in FIG. 1A are trainings for determining antenna setting candidates for the transmission antenna of the communication device 1 (transceiver 400).
- the communication device 1 performs a transmission operation.
- the storage circuit 408, the processing arithmetic circuit 406, the control circuit 407, and the antenna setting circuit 404 of the communication device 1 change the antenna setting of the transmission antenna (for example, the antenna array 405-1 to M) by interlocking with each other. .
- the communication device 1 scans the beam directions of the transmission antenna arrays 405-1 to 405-1M.
- the transmission circuit 403 is also linked.
- the communication device 1 transmits the training signal while scanning the transmission beam direction.
- the training signal passes through the propagation path when the transmission beam direction matches one of a plurality of propagation path directions existing between the communication device 1 (the transceiver 400) and the communication device 2 (the transceiver 500). To come.
- the communication device 2 (transceiver 500) performs a reception operation.
- the storage circuit 508, the processing / arithmetic circuit 506, the control circuit 513, and the antenna setting circuit 510 work together to generate a pseudo omni pattern in the receiving antenna (for example, the antenna array 511-1 to L).
- the receiving circuit 509 is also linked. Accordingly, the communication device 2 receives the training signal transmitted from the communication device 1 with a fixed beam pattern, specifically, a pseudo omni pattern.
- Steps S103-1 and S103-2 are training for determining antenna setting candidates for the transmission antenna of the communication device 2 (transceiver 500). That is, in S103-2, the communication device 2 performs a transmission operation and transmits a training signal while scanning the beam direction by changing the antenna setting. At this time, in S103-1, the communication device 1 receives the training signal from the communication device 2 in a state where the pseudo omni pattern is generated.
- steps S104-1 and S104-2 training for determining antenna setting candidates for the receiving antenna of the communication device 2 is performed.
- the communication device 1 is operated for transmission, and a training signal is transmitted in a state where a pseudo omni pattern is generated in the transmission antenna.
- the communication device 2 is operated to receive, and the antenna setting is changed to receive the training signal from the communication device 1 while scanning the beam direction.
- steps S105-1 and S105-2 are training for determining antenna setting candidates for the receiving antenna of the communication device 1.
- the communication device 2 is operated for transmission, and a training signal is transmitted in a state where a pseudo omni pattern is generated in the transmission antenna.
- the communication device 1 is operated to receive, and the antenna setting is changed to receive the training signal from the communication device 2 while scanning the beam direction.
- a data string describing the relationship between the antenna setting of the transmission antenna of the communication device 1 (that is, the transmission beam direction) and the reception power at the reception antenna of the communication device 2 is acquired.
- the antenna setting of the transmission antenna of the communication device 1 is sent from the transmitter 1 to the transmitter 2 by adding it to the information element when transmitting the training signal in S102-1.
- the data string describing the relationship between the antenna setting and the received power is acquired, but received signal characteristics other than the received power may be used.
- the received signal characteristics other than the received power are, for example, signal power to noise power ratio (SNR).
- FIG. 13 shows an example of the data string.
- the relationship between the identification number of the antenna setting of the communication device 1 (transceiver 400) and the relative received power in the communication device 2 (transceiver 500) is described.
- the relative received power is the maximum received power corresponding to all the antenna settings for which training has been performed, and the maximum received power is expressed as 0 dB, and the other received powers are expressed as ratios thereto.
- a plurality (or singular) of antenna settings whose relative received power exceeds a predetermined threshold is selected from this data string, and these are set as the transmission antennas of the communication device 1. What is necessary is just to make it an antenna setting candidate.
- the number of antenna settings to be detected may be determined in advance, and antenna settings from the higher relative reception power value to the set number may be detected. These processes may be performed by the processing / arithmetic circuit 506.
- the detected antenna setting is stored in the storage circuit 508 if necessary.
- the antenna setting corresponding to the signal path cannot be detected correctly by the method described above. That is, there is a possibility that the antenna setting in the peripheral direction of the beam direction corresponding to the high relative received power becomes the higher antenna setting of the relative received power and detected as the antenna setting corresponding to the signal path.
- peak detection may be performed using information on the beam direction (radiation angle) of the transmission antenna of the scanned transmitter 1.
- the data string in this case is, for example, as shown in FIG.
- the beam direction is scanned in an angle range of 120 ° with a resolution of 4 °.
- a profile as shown in FIG. 15 can be created. If peak detection is performed using this profile, it is possible to correctly detect the antenna setting corresponding to the signal path. Also in this case, all the peaks may be detected, or the number of antenna settings to be detected is determined in advance, and the peak of the relative received power value up to the set number in order from the upper peak is detected. Good.
- the profile shown in FIG. 15 is for showing a concept, and actually, a data string as shown in FIG. Further, for the purpose of explanation, the numerical values in FIG. 15 do not necessarily match those in FIG. Further, when the identification number of the antenna setting is associated with the beam direction, peak detection may be performed without using the angle information.
- the above processing may be performed by the processing / arithmetic circuit 506.
- the detected antenna setting is stored in the storage circuit 508 if necessary.
- the radial direction of the horizontal axis in FIG. 15 is also a one-dimensional quantity.
- the dimension of the antenna array is assumed to be one dimension.
- this embodiment can also be applied to a case where a two-dimensional antenna array is used in a three-dimensional propagation environment. In this case, the row of radiation angles in FIG. 14 and the horizontal axis in FIG. 15 form a two-dimensional array composed of two angles.
- the procedure for determining the antenna setting candidate for the transmission antenna of the communication device 2 using the training signal reception result in S103-1 is the same as that in S106-2 described above, and thus the description thereof is omitted. That is, the procedure of S106-2 may be executed by exchanging the roles of the communication device 1 and the communication device 2.
- the procedure for determining the antenna setting candidate for the receiving antenna of the communication device 1 using the training signal reception result in S105-1 is the same as that in S106-2 described above, and a description thereof will be omitted. That is, the procedure of S106-2 may be executed by exchanging the roles of the communication device 1 and the communication device 2.
- antenna setting candidates for the four antennas are determined.
- the communication devices 1 and 2 perform transmission / reception of information necessary for performing brute force training (S109 to S110) between the determined antenna setting candidates. That is, the total number of antenna setting candidates for the transmission antenna of communication device 2 and the antenna setting candidate for the reception antenna of communication device 1 is sent from communication device 1 to communication device 2 in S107. Similarly, the total number of antenna setting candidates for the transmission antenna of communication device 1 and the antenna setting candidate for the reception antenna of communication device 2 is sent from communication device 2 to communication device 1 in S108.
- the antenna setting candidate information of the transmission antenna may be an identification number of the determined antenna setting as shown in FIG. 16, for example.
- FIG. 16 This figure is an example when four antenna settings are detected.
- the four antenna settings may be arranged in the order of the received power of the training signal, for example, as shown in this figure.
- the communication device 1 transmits the antenna setting pair list regarding the reception antenna of the communication device 1 and the transmission antenna of the communication device 2 acquired in S110 to the communication device 2.
- the antenna setting pair list regarding the transmission antenna of the communication device 1 and the reception antenna of the communication device 2 acquired in S109 is transmitted from the communication device 2 to the communication device 1.
- the information sent in S111 only needs to include the information on the transmission antenna setting of the communication device 2, and from the viewpoint of saving the amount of transmission information, the information on the reception antenna setting of the communication device 1 in FIG. 17 is omitted. Also good.
- the information sent in S112 only needs to include the transmission antenna setting information of the communication device 1, and the reception antenna setting information of the communication device 2 may be omitted.
- the received antenna setting pair list or a part thereof is stored in the storage circuits 408 and 508, respectively.
- the communication device 1 and the communication device 2 select the antenna setting of the same order of the antenna setting pairs stored in the storage devices 408 and 508 by the method described above and start communication (S14 and S15 in FIG. 5).
- the antenna setting order to be used may be sent from the communication device 1 to the communication device 2 in S113.
- the antenna setting order sent here may be both the order regarding the transmission antenna of the communication device 1 and the reception antenna of the communication device 2, the order regarding the transmission antenna of the communication device 2 and the reception antenna of the communication device 1, Either one may be used. Although not shown in the figure, both or one of these orders may be transmitted from the communication device 2 to the communication device 1.
- the communication device 1 and the communication device 2 set the antenna setting circuits 404, 410, 510, and 504 in accordance with the received and transmitted antenna setting pair order (S114), and start communication (S115).
- the communication apparatus 1 and the communication apparatus 2 When communication with the antenna setting pair of the selected rank deteriorates and is detected in S116 and S117, the communication apparatus 1 and the communication apparatus 2 have the same rank among the antenna settings stored in the storage devices 408 and 508.
- Another antenna setting pair is selected (S16 in FIG. 5), the communication quality is confirmed as necessary (S17 in FIG. 5), and if good, the antenna setting pair is adopted and communication is resumed (S118 and S119).
- S118 to S119 correspond to the transition from S15 to S16, the transition from S16 to S17, and the transition from S17 to S15 in the transition diagram of FIG.
- the antenna setting pair may be selected, for example, in the order of storing the antenna setting pair, that is, in the order of communication quality (for example, received power) in brute force training.
- S116 to S119 shown in FIG. 1B show a case where the communication quality deteriorates when the communication device 1 is in the transmission state and the communication device 2 is in the reception state.
- the roles of the communication device 1 and the communication device 2 may be switched and the same processing may be performed.
- the antenna setting pair of the transmission antenna of the communication device 1 and the reception antenna of the communication device 2 may be replaced with a new one at the same time.
- 18A to 18C are sequence diagrams showing in more detail the procedure from the training start (S101) to the communication start (S115) in the simplified sequence diagram of FIG.
- S101 training start
- S115 communication start
- Steps S602 to S605 show in detail an example of the procedure of step S102 in FIG. 1A.
- the communication device 2 sets the receiving antenna setting to a value for training, here, a value for generating an omni or pseudo omni pattern (S602-2).
- the communication device 1 repeats the transmission of the training signal until the signal transmission with all the predetermined antenna settings is completed (S605-1) (S604-1). ).
- an identification number corresponding to each antenna setting or the equivalent is transmitted.
- the communication device 2 receives the training signal and the antenna setting identification number (S604-2).
- Steps S606 to S609 show an example of the procedure of step S103 in FIG. 1A in detail. This is the same operation as that in which the roles of the communication device 1 and the communication device 2 are interchanged in the above-described steps S602 to S605, and thus description thereof is omitted.
- Steps S610 to S613 show an example of the procedure of step S104 in FIG. 1A in detail.
- the communication device 1 sets a transmission antenna setting to a value for training, here, an omni or pseudo omni pattern generation value (S610-1), and transmits a training signal (S612-1).
- the communication device 2 While changing the receiving antenna setting (S611-2), the communication device 2 repeats the reception of the training signal (S612-2) until signal reception with all the predetermined antenna settings is completed (S613-2). ).
- the steps S614 to S617 show in detail an example of the procedure of the step S105 in FIG. 1A. This process is the same as the operation in which the roles of the communication device 1 and the communication device 2 are exchanged in the above-described steps S610 to S613, and thus the description thereof is omitted.
- S620-1, S620-2, S621-1, and S621-2 correspond to S107-1, S107-2, S108-1, and S108-2 in FIG. 1A.
- Steps S622 to S626 show an example of the procedure of step S109 in FIG. 1B in detail.
- the transmission antenna setting candidate of the communication device 1 determined in S618-2 using the training signal reception result in the steps S602 to S605, and the training signal reception result in the steps S610 to S613 are used to perform S619-.
- a round-robin training (communication quality test) is performed between the receiving antenna setting candidates of the communication device 2 determined in step 2.
- the communication device 1 sets the first antenna setting (for example, the antenna setting identification number 14 in FIG. 17) among the transmission antenna setting candidates (S622-1) and transmits a training signal (S624-1).
- the communication device 2 sets all the antenna settings while sequentially setting the reception antenna settings to the setting candidates determined in S619-2 (for example, the antenna setting identification numbers 16, 10, 2, and 7 in FIG. 17) (S623-2). Until reception of the candidate signal is completed (S625-2), reception of the training signal is repeated (S624-2). The above procedure is repeated until all transmission antenna setting candidates (for example, antenna setting identification numbers 14, 20, 6, and 26 in FIG. 17) determined in S618-2 are completed (S626-1).
- Steps S627 to S632 show an example of the procedure of step S110 in FIG. 1B in detail.
- the transmission antenna setting candidate of the communication device 2 determined in S618-1 using the training signal reception result in steps S606 to S609 and the training signal reception result in steps S614 to S617 are used to perform S619-
- the brute force training (communication quality test) is performed between the receiving antenna setting candidates of the communication device 1 determined in 1.
- This step is the same as the operation in which the roles of the communication device 1 and the communication device 2 are exchanged in the above-described steps S622 to S626, and thus description thereof is omitted.
- the process of determining antenna setting candidates for four antennas (transmission and reception antennas of the communication devices 1 and 2) in S602 to S621 can be performed with high accuracy.
- the propagation environment shown in FIG. 11 and FIG. Since the four signals shown in these figures are signals propagated in the opposite directions on the same path, their propagation losses are substantially equal, and the relationship between the received power signals is maintained. Therefore, when there is no error in the detection / determination process of the antenna setting candidates, the antenna setting pair usable for communication can be obtained by combining the transmission antenna setting candidate of the communication device 1 and the reception antenna setting candidate of the communication device 2 in the order of received power. Can be acquired.
- the error means that antenna setting candidates corresponding to different propagation paths are combined.
- the probability that such an error occurs depends on the propagation environment in addition to the antenna characteristics described above. For example, the probability of occurrence increases when the propagation loss of two or more propagation paths has a close value. Further, even if the antenna setting candidate combinations themselves are performed correctly, the order of the antenna setting pairs may be different from the correct received power order.
- the number of antenna setting candidates to be detected / determined is sufficiently small compared to the number of antenna settings for beam direction scanning in S602 to S621, so that even if round-robin is performed, the total training time is greatly increased. There is nothing to increase.
- antenna setting pairs are formed in the order of received power (or other communication quality) when antenna setting candidates are determined. For example, a pair is formed of the transmission antenna setting candidate of the communication device 1 having the first reception power rank and the reception antenna setting candidate of the communication apparatus 2 having the first reception power rank.
- a communication quality test is performed on the plurality of antenna setting pairs formed as described above, and the combination is temporarily canceled only for the antenna setting pairs that do not satisfy the predetermined communication quality standard. Then, with respect to the antenna setting candidates whose combination is canceled because the communication quality standard is not satisfied, a new antenna setting pair is searched by performing a communication quality test on all combinations.
- the priority order of the antenna setting pair may be determined again based on the results of the two communication quality tests.
- FIG. 19 is a sequence diagram showing operations of the transceivers 400 and 500 in the transition process from S15 to S17 in FIG.
- the transceiver 400 (communication device 1 in FIG. 19) is performing a transmission operation
- the transceiver 500 (communication device 2 in FIG. 19) is performing a reception operation
- the transceiver 500 during reception operation detects that communication quality has deteriorated (S702-2), and notifies the transceiver 400 (S703-2).
- the transmitter / receiver 400 during the transmission operation receives a communication quality degradation notification from the transmitter / receiver 500 or receives an ACK signal transmitted from the transmitter / receiver 500 through normal communication when data reception is successful. Recognize that there was an interruption (or worsening of communication status).
- the transceivers 400 and 500 each acquire the antenna setting of the next candidate from the respective database (antenna setting pair list) (S704-1, 2).
- step S705-1 the transceiver 400 sets the antenna setting of the next candidate in the antenna setting circuit 404.
- step S705-2 the transceiver 500 sets the antenna setting of the next candidate in the antenna setting circuit 510.
- the transceivers 400 and 500 resume communication (S706-1, 2).
- the transceiver 500 confirms the communication quality (S707-2). If the communication quality is good, the communication is continued. If the communication quality is not good, an antenna setting change notification is sent (S708-2).
- the transmitter / receiver 400 continues the communication as it is except when the antenna setting change notification is received or when the ACK signal cannot be received from the transmitter / receiver 500 (S709-1).
- the transceivers 400 and 500 try to communicate with the next candidate (S710-1, 2). If any of the antenna setting pair candidates recorded in the storage circuits 408 and 508 does not improve the communication quality and there is no next candidate, the transceivers 400 and 500 return to training.
- the procedure described in this embodiment is only an example.
- there is a degree of freedom in the order of each process a communication device that performs various processes / calculations, and the content of information to be transmitted and received, and even if any of these is different, it deviates from the scope of the present embodiment and the present invention. Not what you want.
- a set of a plurality of processes is combined into one process, for example, as shown in S104-1 in FIG. 1A.
- the order of the processes constituting these processes may be changed between the processes. For example, even when each process constituting S104 of FIG. 1A and each process constituting S105 are temporally alternated, it does not depart from the scope of the present embodiment and the present invention.
- the present embodiment when communication quality degradation such as wireless communication interruption occurs, communication can be resumed quickly by selecting another antenna setting pair candidate generated in advance. it can. In other words, in the present embodiment, it is not necessary to perform training again each time communication quality deteriorates, so that a new antenna setting can be determined in a short time.
- the training time in this embodiment depends on the number of antenna settings for beam direction scanning in S602 to S621, and may be longer. However, in general, since training is performed before the start of communication, a longer time is allowed as compared with the return from interruption in the middle of communication, so the trouble is small.
- a procedure for determining an antenna setting pair a specific example is shown in which a brute force communication quality measurement is performed for each combination of antenna setting candidates and an antenna setting pair is determined based on the measurement result.
- an error may occur in the combination of antenna setting candidates.
- by performing brute force training between antenna setting candidates when the accuracy of the pseudo omni pattern is poor or other measurement errors exist in the antenna setting candidate detection / determination process Also, it becomes possible to obtain an antenna setting pair of the correct combination and order.
- a propagation path that can be used for wireless communication is limited. That is, direct waves and reflected waves from specific objects such as walls, windows, and fixtures. Therefore, the angle to be radiated or the angle to be received in each propagation path is greatly different depending on each wave (signal).
- a propagation path with low rectilinearity such as a 2.4 GHz microwave band, it is necessary to consider the effects of multiple scattering and diffraction. . For this reason, the situation differs between microwave communication and millimeter wave communication of approximately 10 GHz or more and microwave communication of approximately 2.4 GHz.
- the number of reflected waves other than direct waves is limited. Even when a specific direct wave or reflected wave is blocked by an obstacle (for example, a human body), the blocked specific wave and other waves are uncorrelated. Therefore, as described in the present embodiment, in the millimeter wave communication system, a spare beam direction can be secured while performing communication in a beam direction having the best communication state.
- the frequency is less than about 10 GHz, the contribution to the communication quality of multiple reflection and diffraction is large. Therefore, even if a directional antenna is used, the propagation state of the spare beam direction changes depending on the presence or absence of an obstacle. That is, there is a high possibility that the reception state from the spare beam direction, which is good when there is no obstacle, varies depending on the presence of the obstacle. Therefore, it is difficult to obtain the effect of the present invention in 2.4 GHz microwave communication or the like.
- FIGS. 25A and 25B a propagation path due to local reflection may be formed. This is shown in FIGS. 25A and 25B.
- FIG. 25A there are transceivers 81 and 82, and it is assumed that there are a direct wave A, a local reflected wave B, and a reflected wave C in a distant path as propagation paths in beam forming.
- the direct wave A and the locally reflected wave B are simultaneously blocked by, for example, shielding by the human body.
- Patent Document 1 discloses a technique in which priority is not given to a beam direction in the vicinity of a beam direction that has already been given priority, or the priority is lowered.
- an omni or pseudo omni pattern is used as the radiation pattern of the antenna of the communication device in some processes.
- another fixed beam pattern may be used.
- the beam forming operation between the two communication devices has been described. Such an operation is often performed between two communication devices in a system including three or more communication devices.
- piconet coordinators and access points there are usually communicators with special privileges called piconet coordinators and access points.
- piconet coordinators and access points are usually communicators with special privileges called piconet coordinators and access points.
- which two communication devices perform the beam forming operation may be determined by a command from a communication device usually called a piconet coordinator or an access point.
- the piconet coordinator or access point may issue a command in response to a request from a general communication device.
- the same processing is performed by exchanging roles between two communication devices.
- which communication device performs which role first may be determined by a command from a communication device called a piconet coordinator or an access point, for example.
- a second embodiment of the present invention will be described with reference to the transition diagram shown in FIG.
- the configuration of the wireless communication system according to the present embodiment may be the same as that shown in FIG. 3, for example.
- the states of S11 to S17 in FIG. 6 and the transition conditions between them are the same as those in FIG. 5 described in the first embodiment. For this reason, detailed description regarding S11 to S17 is omitted.
- a transition is made from the communication continuing state (S15) to perform additional training.
- the additional training may be executed periodically, or may be executed as appropriate during an idle period in which transmission / reception data does not exist.
- the processing / arithmetic circuits 406 and 506 recalculate a plurality of antenna setting pair candidates.
- the processing / arithmetic circuits 406 and 506 update the antenna setting pair list in the storage devices 408 and 508 with the plurality of antenna setting pairs obtained by recalculation (S19).
- the state for the spare beam direction (antenna setting) is periodically or appropriately investigated by additional training, and the antenna setting pair list is updated.
- wireless communications system concerning this Embodiment can always ensure the newest antenna setting pair list.
- the additional training (S18) may be divided between communications. This eliminates the need to stop communication for a long time.
- communication is interrupted or communication quality deteriorates, it is required to return in a very short time, but this additional training does not require much immediateness, so there is a strong restriction on training time. Absent.
- the immediacy requirement is often weaker than in the initial training. Therefore, even if scanning is carried out by increasing the angular resolution when scanning the beam direction by changing the antenna setting. Good. As a result, it is possible to search for an antenna setting pair that realizes better communication quality.
- the scanning in the beam direction in the additional training may be performed only in the vicinity of the beam direction corresponding to each antenna setting pair obtained in the initial training. This makes it possible to search for an antenna setting pair that realizes good communication quality in a shorter time.
- the entire training (part corresponding to S12 and S13) is performed from the determination of the antenna setting candidate to the creation of the antenna setting pair list.
- a communication quality test is performed on all or part of the antenna setting pairs acquired in S13, and the antenna setting pair list is updated based on the result (the order of the antenna setting pairs in the antenna setting pair list is changed).
- Deletion of some antenna installation pairs, etc. may be performed.
- a round robin communication quality test (corresponding to S109 and S110 in FIG. 1B) is performed for all or part of the antenna setting candidates determined in S12, and antenna setting is performed based on the result.
- the pair list may be updated.
- the update result of the antenna setting pair list performed by the additional training may be reflected immediately after the update to the antenna setting pair used for communication, or from S15 to S16 due to the deterioration of the communication quality. It may be reflected for the first time on the occasion of the transition.
- a third embodiment of the present invention will be described with reference to the transition diagram shown in FIG.
- the configuration of the wireless communication system according to the present embodiment may be the same as that shown in FIG. 3, for example. Further, the states of S11 to S17 in FIG. 7 and the transition conditions between them (except between S16 to S17) are the same as those of the same reference numerals in FIG. 5 described in the first embodiment. For this reason, detailed description regarding S11 to S17 is omitted.
- the next candidate antenna setting pair recorded in the antenna setting pair list is selected (S16), and fine adjustment is performed in that state (S16).
- This fine adjustment refers to a method of searching for an optimum beam (antenna setting) without taking time. Specifically, adjustment may be made so that the communication quality is improved by slightly changing the antenna setting to slightly change the beam direction. Further, a simplified beam search procedure such as “Beam Tracking” described in Patent Document 4 may be applied. Further, the same processing as the initial training may be performed around the beam direction corresponding to the newly selected antenna setting pair with a higher angular resolution than the initial training.
- the reception power when sequentially moving from an antenna setting pair corresponding to a large reception power to an antenna setting pair corresponding to a small reception power, the reception power gradually decreases, The accuracy may go down. Therefore, it is possible to find an antenna setting pair capable of high-accuracy and stable transmission by performing gain adjustment at the time of reception, for example, and performing fine adjustment in an optimal state in a state where reception power is reduced due to shielding. An effect is obtained.
- a fourth embodiment of the present invention will be described with reference to the transition diagram shown in FIG.
- the configuration of the wireless communication system according to the present embodiment may be the same as that shown in FIG. 3, for example. Further, the transition conditions between each of the states S11 to S17 in FIG. 8 (except between S13 to S14) are the same as those in FIG. 5 described in the first embodiment. For this reason, detailed description regarding S11 to S17 is omitted.
- fine adjustment is performed on all or a part of the antenna setting pairs included in the list before starting communication (S21).
- the fine adjustment refers to adjusting the antenna setting around the beam direction corresponding to the antenna setting pair included in the list with a higher angular resolution than the training in S12.
- an antenna setting pair is selected from the antenna setting pair list that has been finely adjusted (S14), and communication is started (S15).
- the present embodiment it is possible to improve the communication quality between the transceivers 400 and 500 when using each antenna setting pair included in the antenna setting pair list. Further, since fine adjustment is performed in advance prior to the start of communication, the communication interruption time can be shortened compared to the case where fine adjustment is performed when the antenna setting pair is changed after communication interruption occurs.
- a fifth embodiment of the present invention will be described with reference to the transition diagram shown in FIG.
- the configuration of the wireless communication system according to the present embodiment may be the same as that shown in FIG. 3, for example. Further, the transition conditions between the states of S11 to S17 in FIG. 9 and between them (except between S13 to S14 and between S16 to S17) are the same as those in FIG. 5 described in the first embodiment. It is the same. For this reason, detailed description regarding S11 to S17 is omitted.
- a plurality of the procedures added to the first embodiment can be applied simultaneously.
- This embodiment is an example in which all the procedures (S18 and S19, S20, S22) are added simultaneously.
- FIG. 10 The configuration of the wireless communication system according to the present embodiment may be the same as that shown in FIG. 3, for example. Further, the states of S11 to S15 in FIG. 10 and the transition conditions between them (except for between S15 and S11) are the same as those of the same reference numerals in FIG. 5 described in the first embodiment. For this reason, detailed description regarding S11 to S15 is omitted.
- the present invention includes the antenna setting even when the accuracy of the pseudo omni pattern is poor in the antenna setting candidate detection / determination process or when other measurement errors exist. By performing brute force training between candidates, there is another effect that it is possible to obtain an antenna setting pair having a correct combination and order. Therefore, the present invention is effective even in the case of the present embodiment in which the stored spare antenna setting pair is not used.
- FIGS. 20A to 20B A seventh embodiment of the present invention will be described with reference to the sequence diagrams shown in FIGS. 20A to 20B. This sequence diagram is a modification of that shown in FIGS. 18A to 18B. After the process of FIG. 20B is completed, the process of FIG. 18C may be executed.
- a pseudo omni pattern is used in the process for determining antenna setting candidates for each antenna (S102 to S105 in FIG. 1A, and S602 to S617 in FIGS. 18A and B).
- the pseudo omni pattern generated in part or all of S102-2, S103-1, S104-1, and S105-2 in FIG. 1A is divided into a plurality of appropriate angular ranges. Some or all of the steps S102, S103, S104, and S105 may be repeated a plurality of times for each angle range.
- the sequence diagrams shown in FIGS. 20A to 20B are examples in the case where the processes of S104 and S105 in FIG. 1A are each divided twice. Compared with FIGS. 18A to 18B, steps S639 to S642 and S643 to S646 are added.
- the two pseudo omni patterns set in S610-1 and S639-1 cover the desired angular range of the transmission antenna of the communication device 1.
- both reception signal data acquired in S612-2 and S641-2 may be used.
- the desired angular range of the transmission antenna of the communication device 2 is covered with the two pseudo omni patterns set in S614-2 and S643-2.
- both reception signal data acquired in S616-1 and S645-1 may be used.
- Non-patent document 5 discloses a method for covering a necessary angle range with a combination of a plurality of pseudo omni patterns.
- FIGS. 21A to 21B The eighth embodiment of the present invention will be described with reference to the sequence diagrams shown in FIGS. 21A to 21B. These sequence diagrams are modifications of the sequence diagrams shown in FIGS. 18A to 18B. After the process of FIG. 21B is completed, the process of FIG. 18C may be executed.
- the communication device that performs various processes and operations, the content of information to be transmitted and received, and the like. is there.
- the present embodiment shows an example of such a modification. The operation will be described below with reference to the sequence diagrams of FIGS. 21A to 21B.
- the communication device 2 sets the receiving antenna setting to a value for training, here, a value for generating an omni or pseudo omni pattern (S602-2). While changing the transmission antenna setting (S603-1), the communication device 1 repeats the transmission of the training signal until the signal transmission with all the predetermined antenna settings is completed (S605-1) (S604-1). ). The communication device 2 receives the training signal (S604-2).
- the communication device 2 feeds back the measurement data received in S604-2 to the communication device 1 (S647-2).
- the transmitter 1 receives this (S647-1), and determines its transmission antenna setting candidate using this measurement data.
- the contents of information transmitted and received in S652 and S653 are also different from those in the first embodiment.
- all antenna setting candidates are determined by the communication device itself equipped with each antenna. Therefore, there is no need to transmit / receive antenna setting candidates as shown in FIG.
- the brute force communication quality test is performed between the antenna setting candidates of the transmission antenna of the communication device 1 and the reception antenna of the communication device 2 (S622 to S627 in FIG. 18C).
- the process of performing measurement (transmission / reception of training signals) by sequentially combining all the reception antenna setting candidates with respect to the transmission antenna setting candidates is a procedure that is repeated for all transmission antenna setting candidates.
- the process of performing measurement by combining all the transmission antenna setting candidates in order for one reception antenna setting candidate is configured to be repeated for all reception antenna setting candidates. (S654 to S658 in FIG. 22C).
- FIG. 23B A tenth embodiment of the present invention will be described with reference to the sequence diagram shown in FIG. 23B.
- This sequence diagram is a modification of the process shown in FIGS. 18B to 18C.
- the process of FIG. 23B described below may be executed.
- the antenna setting candidates for the transmission antenna of the communication device 1 and the reception antenna of the communication device 2 and the communication with the reception antenna of the communication device 1 are communicated.
- a brute force communication quality test was performed between the antenna setting candidates of the transmission antennas of the machine 2.
- a propagation loss of a closer value This is because even when there are a plurality of propagation paths having communication quality), an antenna setting pair having a correct combination and order is acquired.
- the reception power (or other communication quality) when the antenna setting candidates for each antenna are determined may be paired with setting candidates in the same order.
- the antenna setting candidates for each antenna are determined in the steps up to S619 by the same procedure as in the first embodiment (S618, S619).
- S665 since the brute force communication quality test is not performed, it is not necessary to transmit / receive the number of antenna setting candidates. Accordingly, in S665, only the transmission antenna setting candidate of the communication device 2 is sent from the communication device 1 to the communication device 2. Similarly, in S666, only the transmission antenna setting candidate of the communication device 1 needs to be sent from the communication device 2 to the communication device 1. Thereafter, the communication device 1 notifies the communication device 2 of the antenna setting pair number used for communication (S636), and the communication device 1 and the communication device 2 perform antenna setting according to the notified number (S637) and start communication. (S638).
- the transmission of the antenna setting pair number in S636 may be performed from the communication device 2 to the communication device 1, or may be omitted when the order of the antenna setting pair number used for communication is determined in advance. .
- FIG. 24 is a sequence diagram when beamforming is performed between a communication device (communication device 1) having an antenna having a directivity control function and a communication device (communication device 2) having an antenna that forms a fixed beam. It is an example.
- antenna setting candidates for only the transmission and reception antennas of the communication device 1 may be determined (S603 to S619). That is, the procedure for determining antenna setting candidates for the communication device 2 that forms a fixed beam is not necessary. Further, since it is not necessary to form a pair of antenna settings, there is no brute force quality test process between setting candidates.
- the communication device 2 uses the measurement data in S604-2, determines a transmission antenna setting candidate for the communication device 1 (S618-2), and feeds it back to the communication device 1 ( S667).
- the measurement data in S604-2 may be fed back to the communication device 1, and the communication device 1 may determine its own transmission antenna setting candidate.
- FIG. 24 also shows a procedure for restarting communication when communication is interrupted or communication quality deteriorates (S668 to S671).
- a procedure for restarting communication when communication is interrupted or communication quality deteriorates S668 to S671.
- another antenna setting of the communication device 1 is stored from the storage list. Is selected and set (S670-1), and communication may be resumed (S671).
- the twelfth embodiment is characterized in that training and acquisition / setting of an antenna setting pair are performed at a low speed (narrow band), and actual communication is performed at a relatively high speed (wide band). Or part of the acquisition and setting of the training and antenna setting pair is performed at a low speed (narrow band), the rest of the acquisition and setting of the training and antenna setting pair and the actual communication are performed at a relatively high speed (broadband).
- the method described in any of the first to eleventh embodiments may be used.
- the received power is expected to be small due to large free space propagation loss. For this reason, when the antenna is set to generate an omni or pseudo omni pattern during training, a sufficient carrier power to noise power ratio (CNR) may not be obtained. Therefore, by using a low speed (narrow band) with good reception sensitivity, it is possible to expect effects such as training and improvement in accuracy. Note that using a low speed (narrow band) here means narrowing the frequency band used for training signal transmission or adopting a modulation method with a small required CNR so that the noise bandwidth becomes small. means.
- “adopting a modulation scheme with a small required CNR” means, in other words, employing a modulation scheme with a large distance between signal points on a constellation (usually a low transmission rate).
- a narrow beam width is used, and since the correlation bandwidth is wide, there is a large change in the optimum beam combination (antenna setting pair) at low speed (narrow band) or high speed (wide band). Absent.
- the transceivers 400 and 500 are respectively connected to the transmitting antenna (405-1 to M or 505-1 to K) and the receiving antenna (411-1 to N or 511-). 1 to L) are described.
- no particular assumption was made regarding the relationship between the distance between the transmission antennas 405-1 to M and the reception antennas 411-1 to 41-N of the transceiver 400 and the propagation path distance.
- no particular assumption has been made regarding the relationship between the distance between the transmission antennas 505-1 to 50-K and the reception antennas 511-1 to 511-1 of the transceiver 500 and the distance of the propagation path.
- the configuration of the transmitting antenna and the receiving antenna of each transceiver is generally different. That is, (i) training for determining antenna setting candidates for the transmitting antennas 405-1 to 40-M of the transceiver 400 (S102), (ii) determining antenna setting candidates for the receiving antennas 411-1 to 41-N of the transceiver 400 Training (S105), (iii) training for determining antenna setting candidates for the transmitting antennas 505-1 to 50-K of the transceiver 500, and (iv) receiving antennas 511-1 to 511-1 of the transceiver 500
- An example is shown in which training for determining L antenna setting candidates (S104) is performed individually.
- the transceivers 400 and 500 have only one antenna array and share one antenna array for transmission and reception by switching with a switch or the like, it will be described in the first to twelfth embodiments.
- the amount of work required is reduced by approximately half. This is because the transmission antenna setting candidate (transmission beam direction) and the reception antenna setting candidate (reception beam direction) of the transceiver 400 can be regarded as the same.
- the transmission antenna setting candidate transmission beam direction
- reception antenna setting candidate reception beam direction
- the combination of the two steps to be executed may be any one of S102 and S103, S102 and S104, S103 and S105, or S104 and S105. Moreover, what is necessary is just to perform the process of S109 and S110 which performs a round robin communication quality test between antenna setting candidates corresponding to any one. The types of information that need to be sent and received are also reduced.
- the distance between the transmission antenna and the reception antenna of each communication device is sufficiently small compared to the distance of the propagation path,
- the work amount of the procedure described in the first to twelfth embodiments is reduced to about half as described above.
- the term “communication quality” is used. If the communication quality is representative of the communication quality such as reception level, signal power to noise power ratio (SNR), bit error rate (BER), packet error rate (PER), frame error rate (FER), etc. Often, one or more of them may be used. In addition, for evaluation of communication quality, a specific data string in the preamble included in the transmission data string of the transmitter 401 or 501 may be used.
- SNR signal power to noise power ratio
- BER bit error rate
- PER packet error rate
- FER frame error rate
- control and arithmetic processing related to the generation / switching of antenna setting candidates performed by the transceivers 400 and 500 in the first to twelfth embodiments described above are provided with a program for transceiver control in a computer such as a microprocessor. It can be realized by executing.
- the computer that executes the transceiver control program may execute the computation and transmission / reception control steps shown in the sequence diagrams of FIGS. 18A to 18C and FIG.
- control and calculation processing related to generation / switching of antenna setting candidates performed by the transceiver 500 can be realized by causing a computer such as a microprocessor to execute a program for transceiver control.
- the computer that executes the transceiver control program may execute the computation and transmission / reception control steps shown in the sequence diagrams of FIGS. 18A to 18C and FIG.
- the processing / arithmetic circuits 406 and 506 digital signals from a part of the transmission circuits 403 and 503 (modulation processing, etc.), a part of the reception circuits 409 and 509 (demodulation processing, etc.), the control circuits 407 and 507, etc.
- the components related to processing or device control may be realized by a computer such as a microcomputer or a DSP (Digital Signal Processor).
- so-called software antenna technology may be applied to the transceivers 400 and 500.
- the antenna setting circuits 404, 410, 504, 510 may be constituted by a digital filter or a computer such as a DSP.
Abstract
Description
(a):前記第1の送信アンテナのアンテナ設定を変更しながら、前記第1の送信アンテナからトレーニング信号を送信すること、
(b):前記第2の受信アンテナに固定ビームパターンを設定した状態で、前記第2の受信アンテナにおいて前記トレーニング信号を受信すること、
(c):前記ステップ(b)におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得すること、
(d):前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる少なくとも1つの第1の送信アンテナ設定候補を決定すること、
(e):前記第1の送信アンテナと前記第2の受信アンテナを用いて行った前記ステップ(a)乃至(d)を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第2の送信アンテナの、通信に利用する候補となる少なくとも1つの第2の送信アンテナ設定候補を決定すること、
(f):前記第1の送信アンテナに固定ビームパターンを設定した状態で、前記第1の送信アンテナからトレーニング信号を送信すること、
(g):前記第2の受信アンテナのアンテナ設定を変更しながら、前記第2の受信アンテナにおいて前記トレーニング信号を受信すること、
(h):前記ステップ(g)におけるトレーニング信号の受信結果に基づいて、前記第2の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得すること、
(i):前記データ列を用いて、前記第2の受信アンテナの、通信に利用する候補となる少なくとも1つの第2の受信アンテナ設定候補を決定すること、
(j):前記第1の送信アンテナと前記第2の受信アンテナを用いて行った前記ステップ(f)乃至(i)を、前記第2の送信アンテナと前記第1の受信アンテナの組合せ、について行うことにより、前記第1の受信アンテナの、通信に利用する候補となる少なくとも1つの第1の受信アンテナ設定候補を決定すること、
(k):前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記第1及び第2の通信機の間の通信に利用すること。
(a):前記第1の送信アンテナのアンテナ設定を変更することによって送信ビーム方向を変化させながら、前記第1の送信アンテナからトレーニング信号を送信すること。
(b):前記第2の受信アンテナに固定ビームパターンを設定した状態で、前記第2の受信アンテナにおいて前記トレーニング信号を受信すること、
(c):前記処理(b)におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得すること、
(d):前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる少なくとも1つの第1の送信アンテナ設定候補を決定すること、
(e):前記少なくとも1つの第1の送信アンテナ設定候補を決定するための前記処理(a)乃至(d)と同様の処理を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第2の送信アンテナの、通信に利用する候補となる少なくとも1つの送信アンテナ設定候補を決定すること、
(f):前記第1の送信アンテナに固定ビームパターンを設定した状態で、前記第1の送信アンテナからトレーニング信号を送信すること、
(g):前記第2の受信アンテナのアンテナ設定を変更することによって受信ビーム方向を変化させながら、前記第2の受信アンテナにおいて前記トレーニング信号を受信すること、
(h):前記処理(g)におけるトレーニング信号の受信結果に基づいて、前記第2の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得すること、
(i):前記処理(h)において取得された前記データ列を用いて、前記第2の受信アンテナの、通信に利用する候補となる少なくとも1つの第2の受信アンテナ設定候補を決定すること、
(j):前記少なくとも1つの第2の受信アンテナ設定候補を決定するための前記処理(f)乃至(i)と同様の処理を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第1の受信アンテナの、通信に利用する候補となる少なくとも1つの第1の受信アンテナ設定候補を決定すること、
(k):前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記第1及び第2の通信機の間の通信に利用すること。
(a): (i)前記無線通信装置が送信アンテナ設定を変更することで送信ビーム方向を変化させながら第1のトレーニング信号を送信するとともに、前記相手装置が受信ビームパターンを固定した状態で前記第1のトレーニング信号を受信する第1のトレーニング、及び(ii)前記相手装置が送信ビームパターンを固定して第2のトレーニング信号を送信するとともに、前記無線通信装置が受信ンテナ設定を変更することで受信ビーム方向を変化させながら前記第2のトレーニング信号を受信する第2のトレーニング、のうち少なくとも一方のトレーニングを行うことで、前記無線通信装置の送信時に使用するための少なくとも1つの第1の送信アンテナ設定候補、及び前記無線通信装置の受信時に使用するための少なくとも1つの第1の受信アンテナ設定候補を決定すること、
(b): (i)前記相手装置が送信アンテナ設定を変更することで送信ビーム方向を送信ビーム方向を変化させながら第3のトレーニング信号を送信し、前記無線通信装置が受信ビームパターンを固定した状態で前記第3のトレーニング信号を受信する第3のトレーニング、及び(ii)前記無線通信装置が送信ビームパターンを固定して第4のトレーニング信号を送信し、前記相手装置が受信ンテナ設定を変更することで受信ビーム方向を変化させながら前記第4のトレーニング信号を受信する第4のトレーニング、のうち少なくとも一方のトレーニングを行うことで、前記相手装置の送信時に使用するための少なくとも1つの第2の送信アンテナ設定候補、及び前記相手装置の受信時に使用するための少なくとも1つの第2の受信アンテナ設定候補を決定すること、及び
(c)前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組み合わせ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記無線通信装置および前記相手装置の間の無線通信に適用すること。
(i)前記第1の通信機がビーム方向を走査して第1のトレーニング信号を送信し、前記第2の通信機が固定されたビームパターンで前記第1のトレーニング信号を受信することにより、前記第1の通信機の送信ビーム候補を選ぶこと、
(ii)前記第1の通信機が固定されたビームパターンで第2のトレーニング信号を送信し、前記第2の通信機がビーム方向を走査して前記第2のトレーニング信号を受信することにより、前記第2の通信機の受信ビーム候補を選ぶこと、及び
(iii)前記送信ビーム候補と前記受信ビーム候補を組み合わせるトレーニングを実施すること。
(i)前記第1の通信機がビーム方向を走査して第1のトレーニング信号を送信し、前記第2の通信機が固定されたビームパターンで前記第1のトレーニング信号を受信すること、
(ii)前記第1の通信機が固定されたビームパターンで第2のトレーニング信号を送信し、前記第2の通信機がビーム方向を走査して前記第2のトレーニング信号を受信すること、及び
(iii) 前記第1のトレーニング信号の送受に基づき選ばれた送信ビーム候補と前記第2のトレーニング信号の送受に基づき選ばれた受信ビーム候補とを組み合わせること。
本実施の形態にかかる無線通信システムは、ビームフォーミングのための指向性制御アンテナを有する送受信機400及び500を含む。送受信機400及び500が有する指向性制御アンテナの指向性制御機構は特に限定されない。例えば、送受信機400及び500が有する指向性制御アンテナは、フェーズドアレイアンテナ、セクタ切替アンテナ、又は機械式可動アンテナとしてもよい。
本発明における第2の実施の形態を、図6に示した遷移図を用いて説明する。なお本実施の形態に係る無線通信システムの構成は、例えば図3に示したものと同様とすればよい。図6のS11~S17の各状態とこれらの間での遷移条件は、第1の実施の形態で述べた図5の同一符号のものと同様である。このため、S11~S17に関する詳細な説明は省略する。
本発明における第3の実施の形態を、図7に示した遷移図を用いて説明する。本実施の形態にかかる無線通信システムの構成は、例えば図3に示したものと同様とすればよい。また、図7のS11~S17の各状態とこれらの間(S16~S17間を除く)での遷移条件は、第1の実施の形態で述べた図5の同一符号のものと同様である。このため、S11~S17に関する詳細な説明は省略する。
本発明における第4の実施の形態を、図8に示した遷移図を用いて説明する。本実施の形態にかかる無線通信システムの構成は、例えば図3に示したものと同様とすればよい。また、図8のS11~S17の各状態とこれらの間(S13~S14間を除く)での遷移条件は、第1の実施の形態で述べた図5の同一符号のものと同様である。このため、S11~S17に関する詳細な説明は省略する。
本発明における第5の実施の形態を、図9に示した遷移図を用いて説明する。本実施の形態にかかる無線通信システムの構成は、例えば図3に示したものと同様とすればよい。また、図9のS11~S17の各状態とこれらの間(S13~S14間、S16~S17間を除く)での遷移条件は、第1の実施の形態で述べた図5の同一符号のものと同様である。このため、S11~S17に関する詳細な説明は省略する。
本発明における第6の実施の形態を、図10に示した遷移図を用いて説明する。本実施の形態にかかる無線通信システムの構成は、例えば図3に示したものと同様とすればよい。また、図10のS11~S15の各状態とこれらの間(S15~S11間を除く)での遷移条件は、第1の実施の形態で述べた図5の同一符号のものと同様である。このため、S11~S15に関する詳細な説明は省略する。
本発明における第7の実施の形態を、図20A~図20Bに示したシーケンス図を用いて説明する。本シーケンス図は、図18A~図18Bに示したものの変形であり、図20Bの工程終了後は、図18Cの工程を実行すればよい。
同様に、S614-2とS643-2で設定する2つの擬似オムニパターンで、通信機2の送信アンテナの所望の角度範囲がカバーされる。S619-1において通信機1の受信アンテナ設定候補を決定する際には、S616-1及びS645-1で取得した両方の受信信号データを使用すればよい。
本発明における第8の実施の形態を、図21A~図21Bに示したシーケンス図を用いて説明する。これらのシーケンス図は、図18A~図18Bに示したシーケンス図の変形である。図21Bの工程終了後は、図18Cの工程を実行すればよい。
本発明における第9の実施の形態を、図22Cに示したシーケンス図を用いて説明する。本シーケンス図は図18Cに示したシーケンス図の変形であり、図18A~図18B、あるいは図20A~図20B、あるいは図21A~図21B、等の工程終了後に、以下に説明する図22Cの工程を実行すればよい。
本発明における第10の実施の形態を、図23Bに示したシーケンス図を用いて説明する。本シーケンス図は図18B~図18Cに示した工程の変形であり、例えば図18Aに示した工程終了後に、以下に説明する図23Bの工程を実行すればよい。
以上の説明においては、指向性制御機能を有するアンテナを具備した通信機間での通信を想定していた。しかし本発明は、固定ビームを形成するアンテナを具備した通信機と指向性制御機能を有するアンテナを具備した通信機の通信にも適用可能である。図24は、指向性制御機能を有するアンテナを具備した通信機(通信機1)と固定ビームを形成するアンテナを具備した通信機(通信機2)との間でビームフォーミングを行う場合のシーケンス図の一例である。
第12の実施の形態では、トレーニング及びアンテナ設定対の取得・設定を低速(狭帯域)で行い、実際の通信は比較的高速(広帯域)で行うことを特徴とする。もしくは、トレーニング及びアンテナ設定対の取得・設定の一部を低速(狭帯域)で行い、トレーニング及びアンテナ設定対の取得・設定の残部、及び実際の通信を比較的高速(広帯域)で行うことを特徴とする。それ以外の動作は、第1~第11の実施の形態の何れかに記載の方法を用いればよい。
第1~12の実施の形態の記述においては、送受信機400及び500が、それぞれ送信アンテナ(405-1~M、又は505-1~K)と受信アンテナ(411-1~N、又は511-1~L)を両方具備する場合について述べた。また、送受信機400の送信アンテナ405-1~Mと受信アンテナ411-1~Nの間の距離と、伝搬路の距離の関係について特に仮定は置かなかった。同様に、送受信機500の送信アンテナ505-1~Kと受信アンテナ511-1~Lの間の距離と、伝搬路の距離の関係についても特に仮定は置かなかった。また、各送受信機の送信アンテナと受信アンテナの構成も、一般には異なる場合を扱った。つまり、(i) 送受信機400の送信アンテナ405-1~Mのアンテナ設定候補を決定するためのトレーニング(S102)、(ii) 送受信機400の受信アンテナ411-1~Nのアンテナ設定候補を決定するためのトレーニング(S105)、(iii) 送受信機500の送信アンテナ505-1~Kのアンテナ設定候補を決定するためのトレーニング(S103)、並びに (iv) 送受信機500の受信アンテナ511-1~Lのアンテナ設定候補を決定するためのトレーニング(S104)、をそれぞれ個別に行う例を示した。
401、801、81、91 送信機
402、502、82、92 受信機
403、503 送信回路
404 アンテナ設定回路
404-1~M、504-1~K AWV(アレイ重みベクトル)制御回路
405-1~M、505-1~K 送信放射素子
406、506 処理・演算回路
407、507 制御回路
408、508 記憶回路
409、509 受信回路
410 アンテナ設定回路
410-1~N、510-1~L AWV(アレイ重みベクトル)制御回路
411-1~N、511-1~L 受信放射素子
413、513 制御回路
414 アンテナ設定回路
414-1~M スイッチ
415-1~M 送信放射素子
416 アンテナ設定回路
416-1~N スイッチ
417-1~N 受信放射素子
83 ビームパターン(イメージ)
84、85 反射体
86 人体
61 壁
62 反射体
Claims (79)
- 第1及び第2の通信機を含む無線通信システムの制御方法であって、
前記第1の通信機は、送信アンテナ設定を変更することによって第1の送信アンテナの送信ビーム方向を制御でき、受信アンテナ設定を変更することによって第1の受信アンテナの受信ビーム方向を制御できるよう構成され、
前記第2の通信機は、送信アンテナ設定を変更することによって第2の送信アンテナの送信ビーム方向を制御でき、受信アンテナ設定を変更することによって第2の受信アンテナの受信ビーム方向を制御できるよう構成され、
前記方法は、
(a):前記第1の送信アンテナのアンテナ設定を変更しながら、前記第1の送信アンテナからトレーニング信号を送信し、
(b):前記第2の受信アンテナに固定ビームパターンを設定した状態で、前記第2の受信アンテナにおいて前記トレーニング信号を受信し、
(c):前記ステップ(b)におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得し、
(d):前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる少なくとも1つの第1の送信アンテナ設定候補を決定し、
(e):前記第1の送信アンテナと前記第2の受信アンテナを用いて行った前記ステップ(a)乃至(d)を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第2の送信アンテナの、通信に利用する候補となる少なくとも1つの第2の送信アンテナ設定候補を決定し、
(f):前記第1の送信アンテナに固定ビームパターンを設定した状態で、前記第1の送信アンテナからトレーニング信号を送信し、
(g):前記第2の受信アンテナのアンテナ設定を変更しながら、前記第2の受信アンテナにおいて前記トレーニング信号を受信し、
(h):前記ステップ(g)におけるトレーニング信号の受信結果に基づいて、前記第2の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得し、
(i):前記データ列を用いて、前記第2の受信アンテナの、通信に利用する候補となる少なくとも1つの第2の受信アンテナ設定候補を決定し、
(j):前記第1の送信アンテナと前記第2の受信アンテナを用いて行った前記ステップ(f)乃至(i)を、前記第2の送信アンテナと前記第1の受信アンテナの組合せ、について行うことにより、前記第1の受信アンテナの、通信に利用する候補となる少なくとも1つの第1の受信アンテナ設定候補を決定し、
(k):前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記第1及び第2の通信機の間の通信に利用する無線通信システムの制御方法。 - 前記ステップ(k)は、
前記少なくとも1つの第1の送信アンテナ設定候補と前記少なくとも1つの第2の受信アンテナ設定候補の間の全ての組合せ又は組合せの一部、及び前記少なくとも1つの第1の受信アンテナ設定候補と前記少なくとも1つの第2の送信アンテナ設定候補の間の全ての組合せ又は組合せの一部、について通信品質を測定すること、及び
測定された通信品質に基づいて通信に使用するアンテナ設定候補の組合せを複数または単数選択すること、
を備える請求項1に記載の無線通信システムの制御方法。 - 前記ステップ(k)は、アンテナ設定候補の組合せに対して通信品質の優れたものから順に優先順位を付与し、この優先順位に従って順次選択したアンテナ設定候補の組合せを用いて無線通信を行うことを備える請求項2記載の無線通信システムの制御方法。
- 前記ステップ(k)は、アンテナ設定候補の組合せに対して通信品質の優れたものから順に優先順位を付与し、その順位が最上位であるアンテナ設定候補の組合せを用いて無線通信を行うことを備える請求項2記載の無線通信システムの制御方法。
- 前記ステップ(k)は、前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、並びに前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、各々のアンテナ設定候補をトレーニング時の受信信号特性順に並べたとき同順序となるアンテナ設定候補どうしを組合せることにより実現することを特徴とする請求項1に記載の無線通信システムの制御方法。
- 前記ステップ(k)は、請求項1に記載した手順により求めたアンテナ設定の組合せを、受信信号特性の良好なものから順に優先順位を付与し、この優先順位に従って順次選択したアンテナ設定の組合せを用いて無線通信を行うことを備える請求項5記載の無線通信システムの制御方法。
- 前記ステップ(k)は、通信中に通信品質を観測し、前記通信品質の悪化に応じて、前記優先順位に従って次順位のアンテナ設定の組合せを選択し、選択したアンテナ設定の組合せを適用して無線通信を行うことを備える請求項3又は請求項6に記載の無線通信システムの制御方法。
- 前記ステップ(a)では前記第1の送信アンテナのアンテナ設定の変更によって前記第1の送信アンテナの送信ビーム方向を走査し、前記ステップ(e)では前記第2の送信アンテナのアンテナ設定の変更によって前記第2の送信アンテナの送信ビーム方向を走査し、前記ステップ(g)では前記第2の受信アンテナのアンテナ設定の変更によって前記第2の受信アンテナの受信ビーム方向を走査し、前記ステップ(j)では前記第1の受信アンテナのアンテナ設定の変更によって前記第1の受信アンテナの受信ビーム方向を走査することを特徴とする請求項1乃至7のいずれか1項に記載の無線通信システムの制御方法。
- 前記ステップ(a)及び(b)、前記ステップ(e)のうち前記ステップ(a)及び(b)に相当する部分、前記ステップ(f)及び(g)、並びに前記ステップ(j)のうち前記(f)及び(g)に相当する部分、の4つのステップ群の少なくともひとつにおいて、前記固定ビームパターンを複数に分割し、分割された各固定ビームパターンについて、前記工程群を繰り返すことを特徴とする請求項1乃至8のいずれか1項に記載の無線通信システムの制御方法。
- 前記固定ビームパターンがオムニ(無指向性)パターンもしくは擬似オムニ(擬似無指向性)パターンであることを特徴とする請求項1乃至9の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(d)を前記第2の通信機において行い、決定された前記少なくとも1つの第1の送信アンテナ設定候補を含む情報を、前記第2の通信機から前記第1の通信機へ伝送することを特徴とする請求項1乃至10の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(e)中の前記ステップ(d)に相当するステップを前記第1の通信機において行い、決定された前記少なくとも1つの第2の送信アンテナ設定候補を含む情報を、前記第1の通信機から前記第2の通信機へ伝送することを特徴とする請求項1乃至11の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(i)は、決定した前記少なくとも1つの第2の受信アンテナ設定候補の数を、前記第2の通信機から前記第1の通信機へ伝送するステップを含むことを特徴とする請求項11又は12記載の無線通信システムの制御方法。
- 前記ステップ(j)中の前記ステップ(i)に相当するステップは、決定した前記少なくとも1つの第1の受信アンテナ設定候補の数を、前記第1の通信機から前記第2の通信機へ伝送することを含むことを特徴とする請求項11乃至13の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(b)において受信されたトレーニング信号の受信特性、もしくは前記ステップ(c)において取得されたデータ列を、前記第2の通信機から前記第1の通信機へ伝送し、前記ステップ(d)を前記第1の通信機において行うことを特徴とする請求項1乃至10の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(e)中の前記ステップ(b)に相当するステップにおいて受信されたトレーニング信号の受信特性、もしくは前記ステップ(e)中の前記ステップ(c)に相当するステップにおいて取得したデータ列を、前記第1の通信機から前記第2の通信機へ伝送し、前記ステップ(e)中の前記ステップ(d)に相当するステップを前記第2の通信機において行うことを特徴とする請求項1乃至10の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(k)は、
前記ステップ(i)において決定された前記少なくとも1つの第2の受信アンテナ設定候補の数を前記第2の通信機から前記第1の通信機へ伝送するステップと、
前記ステップ(e)中の前記ステップ(d)に相当するステップにおいて決定された前記少なくとも1つの第2の送信アンテナ設定候補の数を前記第2の通信機から前記第1の通信機へ伝送するステップと、
を備えることを特徴とする請求項15又は16記載の無線通信システムの制御方法。 - 前記ステップ(k)は、
前記ステップ(j)中の前記ステップ(i)に相当する工程において決定された前記少なくとも1つの第1の受信アンテナ設定候補の数を前記第1の通信機から前記第2の通信機へ伝送するステップと、
前記ステップ(d)において決定された前記少なくとも1つの第1の送信アンテナ設定候補の数を前記第1の通信機から前記第2の通信機へ伝送するステップと、
を備えることを特徴とする請求項15又は16記載の無線通信システムの制御方法。 - 前記少なくとも1つの第1の送信アンテナ設定候補、前記少なくとも1つの第2の送信アンテナ設定候補、前記少なくとも1つの第1の受信アンテナ設定候補、及び前記少なくとも1つの第2の受信アンテナ設定候補のうち少なくとも1つを決定するに際して、各アンテナ設定に対応するビーム方向の情報を利用することを特徴とする請求項1乃至18の何れか1項に記載の無線通信システムの制御方法。
- 前記少なくとも1つの第1の送信アンテナ設定候補、前記少なくとも1つの第2の送信アンテナ設定候補、前記少なくとも1つの第1の受信アンテナ設定候補、及び前記少なくとも1つの第2の受信アンテナ設定候補のうち少なくとも1つを決定するに際して、各アンテナ設定に対応するビーム方向と受信信号特性の関係を記述したデータ列を作成し、そのデータ列においてピーク検出を行うことを特徴とする請求項19記載の無線通信システムの制御方法。
- 第1及び第2の通信機を含む無線通信システムの制御方法であって、
前記第1の通信機は、送信アンテナ設定を変更することによって第1の送信アンテナの送信ビーム方向を制御でき、受信アンテナ設定を変更することによって第1の受信アンテナの受信ビーム方向を制御できるよう構成され、
前記第2の通信機は、第2の送信アンテナ及び第2の受信アンテナを用いて無線信号を送受可能に構成され、
前記方法は、
(a):前記第1の送信アンテナのアンテナ設定を変更しながら、前記第1の送信アンテナからトレーニング信号を送信し、
(b):固定ビームパターンを持つ前記第2の受信アンテナにおいて前記トレーニング信号を受信し、
(c):前記ステップ(b)におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得し、
(d):前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる複数の送信アンテナ設定候補を決定し、
(e):固定ビームパターンを持つ前記第2の送信アンテナからトレーニング信号を送信し、
(f):前記第1の受信アンテナのアンテナ設定を変更しながら、前記第1の受信アンテナにおいて前記トレーニング信号を受信し、
(g):前記ステップ(f)におけるトレーニング信号の受信結果に基づいて、前記第1の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得し、
(h):前記データ列を用いて、前記第1の受信アンテナの、通信に利用する候補となる複数の受信アンテナ設定候補を決定し、
(i):前記(a)乃至(h)の工程を含む手順で求めた、前記複数の送信アンテナ設定候補のうち1つを前記第1の送信アンテナに適用し、及び前記複数の受信アンテナ設定候補のうち1つを前記第1の受信アンテナに適用して、前記第1及び第2の通信機の間の通信を行うことを特徴とする無線通信システムの制御方法。 - 前記ステップ(a)では前記第1の送信アンテナのアンテナ設定の変更によって前記第1の送信アンテナの送信ビーム方向を走査し、前記ステップ(f)では前記第1の受信アンテナのアンテナ設定の変更によって前記第1の受信アンテナの受信ビーム方向を走査することを特徴とする請求項21記載の無線通信システムの制御方法。
- 前記ステップ(a)及び(b)、並びに前記ステップ(e)及び(f)、の2つのステップ群の少なくともひとつにおいて、前記固定ビームパターンを複数に分割し、分割された各固定ビームパターンについて、前記工程群を繰り返すことを特徴とする請求項21又は22記載の無線通信システムの制御方法。
- 前記固定ビームパターンがオムニ(無指向性)パターンもしくは擬似オムニ(擬似無指向性)パターンであることを特徴とする請求項21乃至23の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(d)を前記第2の通信機において行い、決定された前記複数の送信アンテナ設定候補を含む情報を、前記第2の通信機から前記第1の通信機へ伝送することを特徴とする請求項21乃至24の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(b)において受信されたトレーニング信号の受信特性、又は前記ステップ(c)において取得されたデータ列を、前記第2の通信機から前記第1の通信機へ伝送し、前記ステップ(d)を前記第1の通信機において行うことを特徴とする請求項21乃至24の何れか1項に記載の無線通信システムの制御方法。
- 前記複数の送信アンテナ設定候補、及び前記複数の受信アンテナ設定候補のうち少なくとも一方を決定するに際して、各アンテナ設定候補に対応するビーム方向の情報を利用することを特徴とする請求項21乃至26の何れか1項に記載の無線通信システムの制御方法。
- 前記複数の送信アンテナ設定候補、及び前記複数の受信アンテナ設定候補のうち少なくとも一方を決定するに際して、各アンテナ設定に対応するビーム方向と受信信号特性の関係を記述したデータ列を作成し、そのデータ列においてピーク検出を行うことを特徴とする請求項27記載の無線通信システムの制御方法。
- 前記ステップ(i)は、前記複数の送信アンテナ設定候補および前記複数の受信アンテナ設定候補に対して受信信号特性の良好なものから順に優先順位を付与し、この優先順位に従って順次選択した送信アンテナ設定候補及び受信アンテナ設定候補を用いて無線通信を行うことを備える請求項21乃至28の何れか1項に記載の無線通信システムの制御方法。
- 前記ステップ(i)は、通信中に通信品質を観測し、前記通信品質の悪化に応じて、前記優先順位に従って次順位の送信アンテナ設定候補及び受信アンテナ設定候補を選択し、選択した送信及び受信アンテナ設定候補を適用して無線通信を行うことを備える請求項29記載の無線通信システムの制御方法。
- 主としてデータ通信に用いる信号を含む電波と、これに比してデータ伝送速度が低い又は伝送周波数帯域が狭い電波を用い、前記データ伝送速度が低い又は伝送周波数帯域が狭い電波を用いてトレーニング、もしくはトレーニングの一部を行うことを特徴とする請求項1乃至30の何れか1項に記載の無線通信システムの制御方法。
- 第1の送信アンテナから無線信号を送信でき、第1の受信アンテナによって無線信号を受信できるよう構成された第1の通信機と、
第2の送信アンテナから無線信号を送信でき、第2の受信アンテナによって無線信号を受信できるよう構成された第2の通信機と、
前記第1の送信アンテナのアンテナ設定を変更することによって送信ビーム方向を変化させながら、前記第1の送信アンテナからトレーニング信号を送信するための第1の手段と、
前記第2の受信アンテナに固定ビームパターンを設定した状態で、前記第2の受信アンテナにおいて前記トレーニング信号を受信するための第2の手段と、
前記第2の手段におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得するための第3の手段と、
前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる少なくとも1つの第1の送信アンテナ設定候補を決定するための第4の手段と、
前記少なくとも1つの第1の送信アンテナ設定候補を決定するための前記第1乃至第4の手段と同様の処理を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第2の送信アンテナの、通信に利用する候補となる少なくとも1つの送信アンテナ設定候補を決定するための第5の手段と、
前記第1の送信アンテナに固定ビームパターンを設定した状態で、前記第1の送信アンテナからトレーニング信号を送信するための第6の手段と、
前記第2の受信アンテナのアンテナ設定を変更することによって受信ビーム方向を変化させながら、前記第2の受信アンテナにおいて前記トレーニング信号を受信するための第7の手段と、
前記第7の手段におけるトレーニング信号の受信結果に基づいて、前記第2の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得するための第8の手段と、
前記第8の手段により取得された前記データ列を用いて、前記第2の受信アンテナの、通信に利用する候補となる少なくとも1つの第2の受信アンテナ設定候補を決定するための第9の手段と、
前記少なくとも1つの第2の受信アンテナ設定候補を決定するための前記第6乃至第9の手段と同様の処理を、前記第2の送信アンテナと前記第1の受信アンテナの組合せについて行うことにより、前記第1の受信アンテナの、通信に利用する候補となる少なくとも1つの第1の受信アンテナ設定候補を決定するための第10の手段と、
前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記第1及び第2の通信機の間の通信に利用するための第11の手段とを備える無線通信システム。 - 前記第11の手段は、
前記少なくとも1つの第1の送信アンテナ設定候補と前記少なくとも1つの第2の受信アンテナ設定候補の間の全ての組合せ又は組合せの一部、及び前記少なくとも1つの第1の受信アンテナ設定候補と前記少なくとも1つの第2の送信アンテナ設定候補の間の全ての組合せ又は組合せの一部、について通信品質を測定すること、及び
測定された通信品質に基づいて通信に使用するアンテナ設定候補の組合せを複数または単数選択すること、
を備える請求項32に記載の無線通信システム。 - 前記第11の手段は、アンテナ設定候補の組合せに対して通信品質の優れたものから順に優先順位を付与し、この優先順位に従って順次選択したアンテナ設定候補の組合せを用いて無線通信を行うことを特徴とする請求項33記載の無線通信システム。
- 前記第11の手段は、アンテナ設定候補の組合せに対して通信品質の優れたものから順に優先順位を付与し、その順位が最上位であるアンテナ設定候補の組合せを用いて無線通信を行うことを特徴とする請求項33記載の無線通信システム。
- 前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組合せ、並びに前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、各々のアンテナ設定候補をトレーニング時の受信信号特性順に並べたとき同順序となるアンテナ設定候補どうしを組合せることにより実現することを特徴とする請求項32に記載の無線通信システム。
- 前記第11の手段は、請求項56に記載した手順により求めたアンテナ設定の組合せを、受信信号特性の良好なものから順に優先順位を付与し、この優先順位に従って順次選択したアンテナ設定の組合せを用いて無線通信を行うことを特徴とする請求項36記載の無線通信システム。
- 前記第11の手段は、通信中に通信品質を観測し、前記通信品質の悪化に応じて、前記優先順位に従って次順位のアンテナ設定の組合せを選択し、選択したアンテナ設定の組合せを適用して無線通信を行うことを特徴とする請求項34又は請求項37に記載の無線通信システム。
- 前記第1の手段は前記第1の送信アンテナのアンテナ設定の変更によって前記第1の送信アンテナの送信ビーム方向を走査し、前記第5の手段は前記第2の送信アンテナのアンテナ設定の変更によって前記第2の送信アンテナの送信ビーム方向を走査し、前記第7の手段は前記第2の受信アンテナのアンテナ設定の変更によって前記第2の受信アンテナの受信ビーム方向を走査し、前記第7の手段は前記第1の受信アンテナのアンテナ設定の変更によって前記第1の受信アンテナの受信ビーム方向を走査することを特徴とする請求項32乃至38のいずれか1項に記載の無線通信システム。
- 前記第1の手段及び第2の手段、前記第5の手段のうち前記第1の手段及び第2の手段に相当する部分、前記第6の手段及び第7の手段、前記第10の手段のうち前記第6の手段及び第7の手段に相当する部分、の4つの手段群の少なくともひとつは、前記固定ビームパターンを複数に分割し、分割された各固定ビームパターンについて、前記工程群を繰り返すことを特徴とする請求項32乃至39のいずれか1項に記載の無線通信システム。
- 前記固定ビームパターンがオムニ(無指向性)パターンもしくは擬似オムニ(擬似無指向性)パターンであることを特徴とする請求項32乃至40の何れか1項に記載の無線通信システム。
- 前記第4の手段は前記第2の通信機に配置され、前記第2の通信機は、決定された前記少なくとも1つの第1の送信アンテナ設定候補を含む情報を前記第1の通信機へ伝送するよう構成されている請求項32乃至41の何れか1項に記載の無線通信システム。
- 前記第5の手段中の前記第4の手段に相当する部分は前記第1の通信機に配置され、前記第1の通信機は、決定された前記少なくとも1つの第2の送信アンテナ設定候補を含む情報を前記第2の通信機へ伝送するよう構成されている請求項32乃至42の何れか1項に記載の無線通信システム。
- 前記第9の手段は前記第2の通信機に配置され、前記第2の通信機は、前記少なくとも1つの第2の受信アンテナ設定候補の数を前記第1の通信機へ伝送するよう構成されている請求項42又は43記載の無線通信システム。
- 前記第10の手段中の前記第9の手段に相当する部分は前記第1の通信機に配置され、前記第1の通信機は、前記第1の受信アンテナ設定候補の数を前記第2の通信機へ伝送するよう構成されている請求項42又は43記載の無線通信システム。
- 前記第4の手段は前記第1の通信機に配置され、
前記第2の通信機は、前記第2の手段において受信されたトレーニング信号の受信特性、もしくは前記第3の手段において取得されたデータ列を前記第1の通信機へ伝送するよう構成されている請求項32乃至42の何れか1項に記載の無線通信システム。 - 前記第5の手段中の前記第4の手段に相当する部分は前記第2の通信機に配置され、
前記第1の通信機は、前記第5の手段中の前記第2の手段に相当する部分において受信されたトレーニング信号の受信特性、もしくは前記第5の手段中の前記第3の手段に相当する部分において取得されたデータ列を前記第2の通信機へ伝送するよう構成されている請求項32乃至42の何れか1項に記載の無線通信システム。 - 前記第11の手段は、
前記第9の手段において決定された前記少なくとも1つの第2の受信アンテナ設定候補の数を前記第2の通信機から前記第1の通信機へ伝送する手段と、
前記第5の手段中の前記第4の手段に相当する部分において決定された前記少なくとも1つの第2の送信アンテナ設定候補の数を前記第2の通信機から前記第1の通信機へ伝送する手段と、
を備えることを特徴とする請求項46又は47記載の無線通信システム。 - 前記第11の手段は、
前記第10の手段中の前記第9の手段に相当する部分において決定された前記少なくとも1つの第1の受信アンテナ設定候補の数を前記第1の通信機から前記第2の通信機へ伝送する手段と、
前記第4の手段において決定された前記少なくとも1つの第1の送信アンテナ設定候補の数を前記第1の通信機から前記第2の通信機へ伝送する手段と、
を備えることを特徴とする請求項46又は47記載の無線通信システム。 - 前記少なくとも1つの第1の送信アンテナ設定候補、前記少なくとも1つの第2の送信アンテナ設定候補、前記少なくとも1つの第1の受信アンテナ設定候補、及び前記少なくとも1つの第2の受信アンテナ設定候補のうち少なくとも1つを決定するに際して、各アンテナ設定に対応するビーム方向の情報を利用することを特徴とする請求項32乃至49の何れか1項に記載の無線通信システム。
- 前記少なくとも1つの第1の送信アンテナ設定候補、前記少なくとも1つの第2の送信アンテナ設定候補、前記少なくとも1つの第1の受信アンテナ設定候補、及び前記少なくとも1つの第2の受信アンテナ設定候補のうち少なくとも1つを決定するに際して、各アンテナ設定に対応するビーム方向と受信信号特性の関係を記述したデータ列を作成し、そのデータ列においてピーク検出を行うことを特徴とする請求項50記載の無線通信システム。
- 第1の送信アンテナから無線信号を送信でき、第1の受信アンテナによって無線信号を受信できるよう構成された第1の通信機と、
第2の送信アンテナから無線信号を送信でき、第2の受信アンテナによって無線信号を受信できるよう構成された第2の通信機と、
前記第1の送信アンテナのアンテナ設定を変更することによって送信ビーム方向を変化させながら、前記第1の送信アンテナからトレーニング信号を送信するための第1の手段と、
固定ビームパターンを持つ前記第2の受信アンテナにおいて前記トレーニング信号を受信するための第2の手段と、
前記第2の手段におけるトレーニング信号の受信結果に基づいて、前記第1の送信アンテナのアンテナ設定と前記第2の受信アンテナの受信信号特性の関係を記述したデータ列を取得するための第3の手段と、
前記データ列を用いて、前記第1の送信アンテナの、通信に利用する候補となる複数の送信アンテナ設定候補を決定するための第4の手段と、
固定ビームパターンを持つ前記第2の送信アンテナからトレーニング信号を送信するための第5の手段と、
前記第1の受信アンテナのアンテナ設定を変更することによって受信ビーム方向を変化させながら、前記第1の受信アンテナにおいて前記トレーニング信号を受信するための第6の手段と、
前記第6の手段におけるトレーニング信号の受信結果に基づいて、前記第1の受信アンテナのアンテナ設定と受信信号特性の関係を記述したデータ列を取得するための第7の手段と、
前記第7の手段で取得された前記データ列を用いて、前記第1の受信アンテナの、通信に利用する候補となる複数の受信アンテナ設定候補を決定するための第8の手段と、
前記複数の送信アンテナ設定候補のうち1つを前記第1の送信アンテナに適用し、及び前記複数の受信アンテナ設定候補のうち1つを前記第1の受信アンテナに適用して、前記第1及び第2の通信機の間の通信を行うための第9の手段とを備える無線通信システム。 - 前記第1の手段は前記第1の送信アンテナのアンテナ設定の変更によって前記第1の送信アンテナの送信ビーム方向を走査し、前記第6の手段は前記第1の受信アンテナのアンテナ設定の変更によって前記第1の受信アンテナの受信ビーム方向を走査することを特徴とする請求項52記載の無線通信システム。
- 前記第1の手段及び第2の手段、並びに前記第5の手段及び第6の手段、の2つの手段群の少なくともひとつにおいて、前記固定ビームパターンを複数に分割し、分割された各固定ビームパターンについて、前記工程群を繰り返すことを特徴とする請求項52又は53記載の無線通信システム。
- 前記固定ビームパターンがオムニ(無指向性)パターンもしくは擬似オムニ(擬似無指向性)パターンであることを特徴とする請求項52乃至54の何れか1項に記載の無線通信システム。
- 前記第4の手段は前記第2の通信機に配置され、
前記第2の通信機は、決定された前記複数の送信アンテナ設定候補を含む情報を前記第1の通信機へ伝送するよう構成されている請求項52乃至55の何れか1項に記載の無線通信システム。 - 前記第4の手段を前記第1の通信機に配置され、
前記第2の通信機は、前記第2の手段において受信されたトレーニング信号の受信特性、又は前記第3の手段において取得されたデータ列を前記第1の通信機へ伝送するよう構成されている請求項52乃至55の何れか1項に記載の無線通信システム。 - 前記複数の送信アンテナ設定候補、及び前記複数の受信アンテナ設定候補のうち少なくとも一方を決定するに際して、各アンテナ設定に対応するビーム方向の情報を利用することを特徴とする請求項52乃至57の何れか1項に記載の無線通信システム。
- 前記複数の送信アンテナ設定候補、及び前記複数の受信アンテナ設定候補のうち少なくとも一方を決定するに際して、各アンテナ設定に対応するビーム方向と受信信号特性の関係を記述したデータ列を作成し、そのデータ列においてピーク検出を行うことを特徴とする請求項58記載の無線通信システム。
- 前記第9の手段は、前記複数の送信アンテナ設定候補および前記複数の受信アンテナ設定候補に対して受信信号特性の良好なものから順に優先順位を付与し、この優先順位に従って順次選択した送信アンテナ設定候補及び受信アンテナ設定候補を用いて無線通信を行うことを特徴とする請求項52乃至59のいずれか1項に記載の無線通信システム。
- 前記第9の手段は、通信中に通信品質を観測し、前記通信品質の悪化に応じて、前記優先順位に従って次順位の送信アンテナ設定候補及び受信アンテナ設定候補を選択し、選択した送信及び受信アンテナ設定候補を適用して無線通信を行うことを特徴とする請求項60記載の無線通信システム。
- 前記第1及び第2の送信アンテナ並びに前記第1及び第2の受信アンテナの少なくとも何れか一つが、フェーズドアレイアンテナであることを特徴とする請求項32乃至61の何れか1項に記載の無線通信システム。
- 前記アンテナ設定が、アレイ重みベクトルの設定であることを特徴とする請求項62記載の無線通信システム。
- 前記第1及び第2の送信アンテナ並びに前記第1及び第2の受信アンテナの少なくとも何れか一つが、セクタ切替アンテナであることを特徴とする請求項32乃至61の何れか1項に記載の無線通信システム。
- 前記アンテナ設定が、放射素子を選択するスイッチの設定であることを特徴とする請求項64記載の無線通信システム。
- 前記第1及び第2の送信アンテナ並びに前記第1及び第2の受信アンテナの少なくとも何れか一つが、機械式アンテナであることを特徴とする請求項32乃至61の何れか1項に記載の無線通信システム。
- 前記アンテナ設定が、アンテナ方向の機械的操作により行われることを特徴とする請求項66記載の無線通信システム。
- 前記受信信号特性が、受信電力、信号電力対雑音電力比(SNR)、ビット誤り率(BER)、パケット誤り率(PER)、フレーム誤り率(FER)のうちの1つ又は複数であることを特徴とする請求項32乃至67の何れか1項に記載の無線通信システム。
- 主としてデータ通信に用いる信号を含む電波と、これに比してデータ伝送速度が低い又は伝送周波数帯域が狭い電波を用い、前記データ伝送速度が低い又は伝送周波数帯域が狭い電波を用いてトレーニング、もしくはトレーニングの一部を行うことを特徴とする請求項32乃至68の何れか1項に記載の無線通信システム。
- 相手装置との間で無線通信を行う無線通信装置であって、
送信アンテナ設定を変更することによって第1の送信アンテナの送信ビーム方向を制御する送信アンテナ設定制御部と、
受信アンテナ設定を変更することによって第1の受信アンテナの受信ビーム方向を制御する受信アンテナ設定制御部と、
前記相手装置との無線通信に利用する送信及び受信アンテナ設定候補の決定処理を前記相手装置と協調して行う処理部と、
を備え、
前記送信及び受信アンテナ設定候補の決定処理は、
(a): (i)前記無線通信装置が送信アンテナ設定を変更することで送信ビーム方向を変化させながら第1のトレーニング信号を送信するとともに、前記相手装置が受信ビームパターンを固定した状態で前記第1のトレーニング信号を受信する第1のトレーニング、及び(ii)前記相手装置が送信ビームパターンを固定して第2のトレーニング信号を送信するとともに、前記無線通信装置が受信ンテナ設定を変更することで受信ビーム方向を変化させながら前記第2のトレーニング信号を受信する第2のトレーニング、のうち少なくとも一方のトレーニングを行うことで、前記無線通信装置の送信時に使用するための少なくとも1つの第1の送信アンテナ設定候補、及び前記無線通信装置の受信時に使用するための少なくとも1つの第1の受信アンテナ設定候補を決定すること、
(b): (i)前記相手装置が送信アンテナ設定を変更することで送信ビーム方向を送信ビーム方向を変化させながら第3のトレーニング信号を送信し、前記無線通信装置が受信ビームパターンを固定した状態で前記第3のトレーニング信号を受信する第3のトレーニング、及び(ii)前記無線通信装置が送信ビームパターンを固定して第4のトレーニング信号を送信し、前記相手装置が受信ンテナ設定を変更することで受信ビーム方向を変化させながら前記第4のトレーニング信号を受信する第4のトレーニング、のうち少なくとも一方のトレーニングを行うことで、前記相手装置の送信時に使用するための少なくとも1つの第2の送信アンテナ設定候補、及び前記相手装置の受信時に使用するための少なくとも1つの第2の受信アンテナ設定候補を決定すること、及び
(c):前記第1の送信アンテナ設定候補と前記第2の受信アンテナ設定候補の組み合わせ、及び前記第1の受信アンテナ設定候補と前記第2の送信アンテナ設定候補の組合せを、前記無線通信装置および前記相手装置の間の無線通信に適用すること、
を備える無線通信装置。 - 前記処理(c)は、
前記少なくとも1つの第1の送信アンテナ設定候補と前記少なくとも1つの第2の受信アンテナ設定候補の間の全ての組合せ又は組合せの一部、及び前記少なくとも1つの第1の受信アンテナ設定候補と前記少なくとも1つの第2の送信アンテナ設定候補の間の全ての組合せ又は組合せの一部、について通信品質を測定すること、及び
測定された通信品質に基づいて通信に使用するアンテナ設定候補の組合せを複数または単数選択すること、
を備える請求項70記載の無線通信装置。 - 前記処理(c)は、アンテナ設定候補の組合せに対して通信品質の優れたものから順に優先順位を付与し、この優先順位に従って順次選択したアンテナ設定候補の組合せを用いて無線通信を行うことを備える請求項71記載の無線通信装置。
- 前記第1の送信アンテナは、前記第1の受信アンテナを兼ねる送受信共用アンテナであり、前記第2の送信アンテナは、前記第2の受信アンテナを兼ねる送受信共用アンテナである、請求項70乃至72の何れか1項に記載の無線通信装置。
- 第1の通信機と第2の通信機とで無線通信を行う無線通信システムの制御方法であって、
(i)前記第1の通信機がビーム方向を走査して第1のトレーニング信号を送信し、前記第2の通信機が固定されたビームパターンで前記第1のトレーニング信号を受信することにより、前記第1の通信機の送信ビーム候補を選び、
(ii)前記第1の通信機が固定されたビームパターンで第2のトレーニング信号を送信し、前記第2の通信機がビーム方向を走査して前記第2のトレーニング信号を受信することにより、前記第2の通信機の受信ビーム候補を選び、
(iii)前記送信ビーム候補と前記受信ビーム候補を組み合わせるトレーニングを実施する、無線通信システムの制御方法。 - 前記固定されたビームパターンが、オムニパターン(無指向性パターン)、又は、擬似オムニパターン(擬似無指向性パターン)のいずれかである請求項74記載の無線通信システムの制御方法。
- 前記固定ビームパターンが複数に分割されている、請求項74記載の無線通信システムの制御方法。
- 第1の通信機と第2の通信機とで無線通信を行う無線通信システムであって、
(i)前記第1の通信機にビーム方向を走査して第1のトレーニング信号を送信させ、前記第2の通信機に固定されたビームパターンで前記第1のトレーニング信号を受信させる、第1のトレーニング手段と、
(ii)前記第1の通信機に固定されたビームパターンで第2のトレーニング信号を送信させ、前記第2の通信機にビーム方向を走査して前記第2のトレーニング信号を受信させる、第2のトレーニング手段と、
(iii) 前記第1のトレーニング手段の実施により選ばれた送信ビーム候補と前記第2のトレーニング手段の実施により選ばれた受信ビーム候補とを組み合わせる第3のトレーニング手段と、
を備える無線通信システム。 - 前記固定されたビームパターンが、オムニパターン、又は、擬似オムニパターンのいずれかである請求項77記載の無線通信システム。
- 前記固定ビームパターンが複数に分割されている、請求項77記載の無線通信システム。
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CN201080050280.7A CN102598533B (zh) | 2009-11-04 | 2010-11-02 | 无线电通信系统的控制方法、无线电通信系统和无线电通信装置 |
EP10828096.7A EP2498414B1 (en) | 2009-11-04 | 2010-11-02 | Control method for wireless communication system, wireless communication system, and wireless communication device |
US13/505,692 US8811907B2 (en) | 2009-11-04 | 2010-11-02 | Control method of radio communication system, radio communication system, and radio communication apparatus |
JP2011539290A JP5708492B2 (ja) | 2009-11-04 | 2010-11-02 | 無線通信システムの制御方法、無線通信システム、及び無線通信装置 |
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US14/602,792 US9270355B2 (en) | 2009-11-04 | 2015-01-22 | Control method of radio communication system, radio communication system, and radio communication apparatus |
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EP2498414A1 (en) | 2012-09-12 |
US20140292577A1 (en) | 2014-10-02 |
US8971964B2 (en) | 2015-03-03 |
EP2498414B1 (en) | 2022-09-14 |
CN102598533A (zh) | 2012-07-18 |
CN102598533B (zh) | 2015-06-24 |
JP5708492B2 (ja) | 2015-04-30 |
US20150171946A1 (en) | 2015-06-18 |
EP2498414A4 (en) | 2017-04-26 |
US20120220238A1 (en) | 2012-08-30 |
US9270355B2 (en) | 2016-02-23 |
JPWO2011055535A1 (ja) | 2013-03-28 |
US8811907B2 (en) | 2014-08-19 |
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