WO2009157513A1 - 無線通信装置および無線通信方法 - Google Patents
無線通信装置および無線通信方法 Download PDFInfo
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- WO2009157513A1 WO2009157513A1 PCT/JP2009/061631 JP2009061631W WO2009157513A1 WO 2009157513 A1 WO2009157513 A1 WO 2009157513A1 JP 2009061631 W JP2009061631 W JP 2009061631W WO 2009157513 A1 WO2009157513 A1 WO 2009157513A1
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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
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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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
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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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
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
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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
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Definitions
- the present invention relates to a wireless communication apparatus and a wireless communication method for simultaneously transmitting a plurality of communication data series using the same frequency band to a receiving apparatus via a plurality of transmission antennas.
- MIMO multiplexing technique
- the interval between the antennas should be considerably larger than the wavelength of the used frequency ( For example, 4 ⁇ or more) is common.
- the receiving device when the communication quality (for example, SNR) is deteriorated below a predetermined threshold, the receiving device is more than an increase in communication speed by using a plurality of communication data sequences. In order to continue the communication with the transmission device as much as possible, it can be determined that a single communication data sequence is used.
- the transmitting device transmits only one communication data series based on the feedback information transmitted from the receiving device. That is, in such a case, the improvement in the separability of the communication data series due to the diversity effect described above is irrelevant, and the communication speed cannot be increased by simultaneously transmitting a plurality of communication data series.
- an object of the present invention is to provide a wireless communication apparatus and a wireless communication method capable of realizing higher speed and stable communication even when the communication quality deteriorates below a predetermined threshold.
- the present invention has the following features.
- a communication data sequence using the same frequency band is received through a transmission antenna unit (transmission antenna unit 130) including a plurality of transmission antennas (transmission antenna 131 to transmission antenna 134).
- a wireless communication device wireless base station 100 including a wireless communication unit (wireless communication unit 120) that transmits a plurality of signals simultaneously to (wireless terminal 200), and simultaneously receives the wireless communication device and a plurality of communication data sequences.
- the communication quality of the wireless communication path with the receiving device that is separated into each communication data series is deteriorated below a predetermined threshold, among the transmission antennas constituting the transmission antenna unit, the communication quality is the An antenna that performs an antenna selection process for selecting the transmission antenna in which the interval between the transmission antennas is narrower than before the deterioration is lower than a predetermined threshold.
- the antenna selection unit when the communication quality is deteriorated below a predetermined threshold, the antenna selection unit, before the communication quality is deteriorated below the predetermined threshold, among the transmission antennas constituting the transmission antenna unit. Also select a transmitting antenna with a smaller interval.
- the wireless communication apparatus According to the wireless communication apparatus according to the first feature, even in the case of communication quality deteriorated below a predetermined threshold in a multiple-input multiple-output wireless communication system, higher-speed and stable communication can be continued. .
- a second feature of the present invention relates to the first feature of the present invention, wherein the antenna selecting unit obtains a predetermined electric field strength at a position of the receiving device among the transmitting antennas constituting the transmitting antenna unit.
- the gist of the present invention is to determine an interval of the transmission antennas in which a region to be expanded is widened and to perform the antenna selection process based on the determined interval of the transmission antennas.
- a third feature of the present invention relates to the first feature of the present invention, wherein the antenna selection unit is configured to control the transmission antennas constituting the transmission antenna unit when the communication quality is deteriorated below the predetermined threshold.
- the gist is to select the transmission antennas whose interval between the transmission antennas is equal to or less than a predetermined wavelength corresponding to the frequency band.
- a fourth feature of the present invention is according to the third feature of the present invention, wherein the antenna selection unit is configured to change the transmission antenna having a transmission antenna interval of 1 ⁇ or less when the wavelength of the frequency band is 1 ⁇ .
- the gist is to choose.
- a fifth feature of the present invention is according to the third feature of the present invention, wherein the transmission antenna section is a narrow antenna composed of a plurality of transmission antennas arranged at intervals of the predetermined wavelength or less (interval d2).
- the gist is to select the narrow-spaced antenna group.
- a sixth feature of the present invention relates to the third feature of the present invention, wherein the transmission antenna constituting the transmission antenna unit transmits the communication data sequence until the communication quality deteriorates below the predetermined threshold.
- the transmission antenna unit includes a spare transmission antenna (spare transmission antenna 135) that is not used for the transmission, and a specific transmission antenna (transmission antenna 134) in which an interval (interval d4) between the spare transmission antenna is equal to or less than the predetermined wavelength.
- An interval (interval d1, interval d2 or interval d3) between transmission antennas (transmission antenna 131 to transmission antenna 134) other than the spare transmission antenna among the transmission antennas to be performed is larger than the predetermined wavelength, and the antenna selection unit When the communication quality deteriorates below the predetermined threshold, the spare transmission antenna and the specific transmission antenna are selected. And it is required to.
- a seventh feature of the present invention relates to the third feature of the present invention, wherein the transmission antenna constituting the transmission antenna unit transmits the communication data sequence until the communication quality deteriorates below the predetermined threshold.
- the transmission antenna constituting the transmission antenna unit transmits the communication data sequence until the communication quality deteriorates below the predetermined threshold.
- Including a plurality of spare transmission antennas (spare transmission antenna 135 and spare transmission antenna 136), and the spacing between the spare transmission antennas (spacing d5) is equal to or less than the predetermined wavelength, and constitutes the transmission antenna unit Among the transmission antennas, an interval (interval d1, interval d2 or interval d3) between transmission antennas (transmission antenna 131 to transmission antenna 134) different from the auxiliary transmission antenna, and an interval (interval) between the different transmission antenna and the auxiliary transmission antenna d4) is greater than the predetermined wavelength, and the antenna selection unit determines that the communication quality is the predetermined threshold value. If you remote deteriorated, and summarized in that selecting the spare transmit antenna
- An eighth feature of the present invention relates to any one of the first to seventh features of the present invention, and in the antenna selection unit, the wireless communication unit transmits only one communication data sequence at a time. In this case, the gist is to execute the antenna selection process.
- a ninth feature of the present invention relates to the eighth feature of the present invention, and further comprises a weight determining unit (antenna weight determining unit 143) for determining a transmission antenna weight for weighting the communication data series for each of the transmission antennas.
- the weight determination unit determines the transmission antenna weight for improving the communication quality for each transmission antenna.
- a tenth feature of the present invention is that a communication data sequence using the same frequency band is transmitted to a receiving device (wireless) via a transmission antenna unit (transmission antenna unit 130) including a plurality of transmission antennas (transmission antennas 131 to 134).
- a wireless communication device including a plurality of wireless communication units (wireless communication unit 120) capable of simultaneously transmitting toward terminal 200), wherein a plurality of the communication data sequences are received simultaneously to each communication data sequence
- the number of communication data sequences transmitted by the wireless communication unit to the separable receiving device is equal to or less than a predetermined number, the number of communication data sequences among the transmission antennas constituting the transmission antenna unit
- the antenna selection process for performing the antenna selection process for selecting the transmission antenna in which the interval between the transmission antennas is narrower than before the predetermined number is less than the predetermined number. Part comprising a (antenna selector 142), the wireless communication unit via the transmission antenna selected by the antenna selector, to increase the transmission of the communication data series.
- An eleventh feature of the present invention is a wireless communication method using a wireless communication unit that simultaneously transmits a plurality of communication data sequences using the same frequency band to a receiving device via a transmission antenna unit including a plurality of transmission antennas. If the communication quality of the wireless communication path between the wireless communication unit and the receiving device that receives a plurality of the communication data series simultaneously and separates into each communication data series is deteriorated below a predetermined threshold, A step (step S102) of selecting the transmission antenna in which the interval between the transmission antennas is narrower than that before the communication quality is deteriorated below the predetermined threshold among the transmission antennas constituting the transmission antenna unit (step S102); A communication unit including the step of transmitting the communication data sequence via the transmission antenna selected in the selecting step. The gist.
- a twelfth feature of the present invention is a wireless communication method using a wireless communication unit capable of simultaneously transmitting a plurality of communication data sequences using the same frequency band to a receiving device via a transmission antenna unit including a plurality of transmission antennas. And when the number of the communication data series transmitted by the wireless communication unit to the receiving device that can receive a plurality of the communication data series simultaneously and can be separated into each communication data series is equal to or less than a predetermined number, A step of selecting the transmission antenna in which the interval between the transmission antennas is narrower than before the number of the communication data series is equal to or less than the predetermined number among the transmission antennas constituting the transmission antenna unit; and the wireless communication unit Includes transmitting the communication data series via the transmission antenna selected in the selecting step.
- the communication quality is deteriorated below a predetermined threshold. Even in this case, it is possible to provide a wireless communication apparatus and a wireless communication method that can realize continuous communication at higher speed and more stably.
- FIG. 1 is a schematic configuration diagram of a radio communication system according to the first embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the radio base station according to the first embodiment of the present invention.
- FIG. 3 is a block diagram showing the configuration of the radio terminal according to the first embodiment of the present invention.
- FIG. 4 is a diagram for explaining antenna selection processing according to the first embodiment of the present invention (part 1).
- FIG. 5 is a diagram for explaining antenna selection processing according to the first embodiment of the present invention (part 2).
- FIG. 6 is a flowchart showing a transmission parameter determination operation executed in the radio base station according to the first embodiment of the present invention.
- FIG. 7 is a diagram for explaining the effect obtained by the first embodiment of the present invention (part 1).
- FIG. 1 is a schematic configuration diagram of a radio communication system according to the first embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the radio base station according to the first embodiment of the present invention.
- FIG. 3
- FIG. 8 is a diagram for explaining the effect obtained by the first embodiment of the present invention (part 2).
- FIG. 9 is a diagram for explaining the effects obtained by the first embodiment of the present invention (No. 3).
- FIG. 10 is a block diagram showing a configuration of a radio base station according to the second embodiment of the present invention.
- FIG. 11 is a block diagram showing a configuration of a radio base station according to the third embodiment of the present invention.
- FIGS. 1 (a) and 1 (b) are schematic configuration diagrams of a radio communication system 10 according to the first embodiment.
- the radio communication system 10 includes a radio base station 100 and a radio terminal 200.
- the wireless terminal 200 is located in the communication area of the wireless base station 100 and performs wireless communication with the wireless base station 100.
- communication in the downlink direction (direction from the radio base station 100 to the radio terminal 200) will be mainly described.
- the radio base station 100 simultaneously transmits a plurality of communication streams (communication data sequences) using the same frequency band via a plurality of transmission antennas.
- the wireless terminal 200 configures a receiving apparatus that receives a plurality of communication streams via a plurality of reception antennas and separates the communication streams into communication streams.
- the wireless communication system 10 is a multiple-input multiple-output (MIMO) wireless communication system (hereinafter referred to as “MIMO communication system” as appropriate).
- MIMO communication system a multiple-input multiple-output (MIMO communication system” as appropriate.
- FIG. 1A there are four maximum communication streams, four transmission antennas provided in the radio base station 100 (see FIG. 2), and provided in the radio terminal 200.
- FIG. 3 A case where there are two receiving antennas (see FIG. 3), that is, a 4 ⁇ 2 antenna configuration will be described as an example.
- the radio terminal 200 analyzes the communication stream received from the radio base station 100, and generates feedback information for adaptively controlling multi-antenna transmission in the radio base station 100.
- a MIMO communication system that feeds back feedback information is called a closed-loop MIMO communication system.
- the feedback information is composed of “rank”, “PMI (Precoding Mat Index)” and “CQI (Channel Quality Indicator)”.
- Rank is control information for controlling the number of communication streams.
- PMI is control information for controlling the transmission antenna weight.
- CQI is reception quality information for controlling transmission power and modulation scheme.
- the radio terminal 200 determines the number of communication streams and transmits the rank to the radio base station 100 using the uplink radio line. At the same time, the radio terminal 200 calculates the transmission antenna weight that maximizes the received SNR according to the number of communication streams, and transmits the PMI according to the calculation result to the radio base station 100. Also, the radio terminal 200 obtains a CQI from the received SNR and transmits the CQI to the radio base station 100 using an uplink radio channel.
- the radio base station 100 determines the number of downlink communication streams, the transmission antenna weight, the transmission output, and the modulation scheme according to rank, PMI, and CQI transmitted from the radio terminal 200, and realizes adaptive transmission multi-antenna control.
- the number of transmission antennas used is all the transmission antennas of the radio base station 100.
- the radio base station 100 and the radio terminal 200 perform control such that the rank is lowered when the communication quality such as the received SNR is deteriorated, and the rank is raised when the communication quality is improved. That is, communication with a plurality of communication streams is executed if the reception SNR is secured, and the plurality of communication streams are not used when the reception SNR is low.
- the radio terminal 200 calculates the transmission antenna weight and transmits the calculation result to the radio base station 100 as PMI. For this reason, when there is a large difference between the downlink propagation path characteristic when calculating the transmission antenna weight and the downlink propagation path characteristic when transmitting with the transmission antenna weight actually determined by the PMI on the radio base station 100 side In this case, the transmission diversity effect due to the transmission antenna weight is reduced, and the communication quality is significantly degraded.
- the diversity effect means that, in a radio propagation environment in which multipath propagation occurs (see FIG. 1B), communication streams that have passed through a plurality of paths are combined or selected at the reception side to improve communication quality (for example, reception SNR). It is an effect that can be.
- FIG. 2 is a block diagram showing the configuration of the radio base station 100.
- the radio base station 100 includes a data generation unit 110, a radio communication unit 120, a transmission antenna unit 130, and a control unit 140.
- a state at the time of transmitting a plurality of communication streams is shown.
- the data generation unit 110 generates a data series to be transmitted to the wireless terminal 200.
- the wireless communication unit 120 converts the data series generated by the data generation unit 110 into a plurality of communication streams and converts it into a radio frequency band (system frequency band). At that time, each of the plurality of communication streams is converted into the same frequency band.
- the transmission antenna unit 130 sends out a plurality of communication streams converted into a radio frequency band.
- the radio communication unit 120 includes a data distribution unit 121 and four radio signal conversion units (a radio signal conversion unit 122, a radio signal conversion unit 123, a radio signal conversion unit 124, and a radio signal conversion unit 125).
- the data distribution unit 121 distributes the data series generated by the data generation unit 110 to the wireless signal conversion unit 122 to the wireless signal conversion unit 125 under the control of the control unit 140. Specifically, the data distribution unit 121 performs serial / parallel conversion on the data series generated by the data generation unit 110 to generate four communication streams. Thereby, parallel data transfer is possible. When the control unit 140 instructs the data distribution unit 121 to transmit only one communication stream, the data distribution unit 121 outputs the data series generated by the data generation unit 110 without performing serial / parallel conversion.
- the radio signal conversion unit 122 includes an up-converter and a power amplifier, and converts the communication stream from the data distribution unit 121 into a radio frequency band. At that time, the radio signal conversion unit 122 weights the communication stream using a transmission antenna weight by a weighting mechanism provided therein. The transmission antenna weight adjusts the phase and amplitude of the communication stream, and is input from the control unit 140.
- the power amplifier in the radio signal conversion unit 122 is instructed by the control unit 140 to transmit power of the communication stream converted into the radio frequency band.
- the radio signal converter 123, the radio signal converter 124, and the radio signal converter 125 operate in the same manner as the radio signal converter 122.
- the transmission antenna unit 130 has four transmission antennas (transmission antenna 131, transmission antenna 132, transmission antenna 133, and transmission antenna 134) arranged linearly at predetermined intervals (linear arrangement).
- the transmission antenna 131 is connected to the radio signal conversion unit 122, the transmission antenna 132 is connected to the radio signal conversion unit 123, the transmission antenna 133 is connected to the radio signal conversion unit 124, and the transmission antenna 134 is connected to the radio signal conversion unit 125. Is done.
- the transmission antenna 131 and the transmission antenna 132 are arranged at an interval d1.
- the transmission antenna 132 and the transmission antenna 133 are arranged with an interval d2.
- the transmission antenna 133 and the transmission antenna 134 are arranged at an interval d3.
- the distance d2 between the transmission antenna 132 and the transmission antenna 133 is narrower than the distance d1 between the transmission antenna 131 and the transmission antenna 132 and the distance d3 between the transmission antenna 133 and the transmission antenna 134, respectively.
- Transmit antennas 131 to 134 are arranged. Further, the interval d1 and the interval d3 are substantially equal.
- the control unit 140 determines the transmission parameters, that is, the transmission antenna, the transmission antenna weight, the transmission power, and the modulation scheme, according to the feedback information from the radio terminal 200.
- the control unit 140 includes a stream determination unit 141, an antenna selection unit 142, an antenna weight determination unit 143, and a transmission power / modulation method determination unit 144.
- the rank fed back from the wireless terminal 200 is input to the stream determination unit 141.
- the stream determination unit 141 determines whether or not the number of communication streams is 1 based on rank. Here, when the number of transmission streams is 1, it indicates that communication quality such as reception SNR in the radio terminal 200 has deteriorated below a predetermined threshold.
- the stream determination unit 141 constitutes a determination unit that determines whether or not the communication quality of the wireless communication path between the wireless base station 100 and the wireless terminal 200 has deteriorated below a predetermined threshold.
- the stream determination unit 141 controls the data distribution unit 121 according to the rank determination result.
- the antenna selection unit 142 selects a transmission antenna to be used for transmission of the communication stream from the transmission antennas 131 to 134.
- the antenna selection unit 142 sets the number of transmission antennas to 4 when rank is other than 1, that is, when the communication quality has not deteriorated below a predetermined threshold.
- the antenna selection unit 142 sets the number of transmission antennas to 2 when rank is 1, that is, when it is determined that the communication quality has deteriorated below a predetermined threshold.
- the antenna selection unit 142 performs an antenna selection process of selecting the transmission antennas 132 and 133 in which the interval between the transmission antennas is narrower than before the transmission antennas 131 to 134 are determined to have deteriorated in communication quality below a predetermined threshold. Execute. Details of the antenna selection processing will be described later.
- the PMI fed back from the wireless terminal 200 is input to the antenna weight determination unit 143.
- the antenna weight determination unit 143 determines the transmission antenna weight according to the PMI, and outputs the transmission antenna weight to the radio signal conversion unit 122 to the radio signal conversion unit 125.
- Transmission power / modulation scheme determination section 144 determines transmission power and modulation scheme according to CQI, and controls radio signal conversion section 122 to radio signal conversion section 125 according to the determination result.
- FIG. 3 is a block diagram showing the configuration of the radio terminal 200.
- the wireless terminal 200 includes two reception antennas (a reception antenna 201 and a reception antenna 202), a wireless communication unit 210, and a reception signal analysis unit 220.
- the wireless communication unit 210 includes a wireless signal conversion unit 211, a wireless signal conversion unit 212, and a data synthesis unit 213.
- the radio signal converter 211 includes a low noise amplifier, a down converter, and the like, and amplifies and downconverts the received signal received by the receiving antenna 201. At the time of transmitting a plurality of communication streams, the wireless signal conversion unit 211 outputs a plurality of communication streams that have interfered with each other in the wireless section.
- the wireless signal converter 212 operates in the same manner as the wireless signal converter 211.
- the communication stream output from the wireless signal converter 211 and the communication stream output from the wireless signal converter 212 are substantially equal.
- the data combining unit 213 combines the communication stream output from the wireless signal conversion unit 211 and the communication stream output from the wireless signal conversion unit 212.
- the received signal analysis unit 220 analyzes the received signal and determines the number of communication streams (rank) corresponding to the propagation path characteristics. When the rank is 1, the reception signal analysis unit 220 fixes the number of transmission antennas of the radio base station 100 to 2, and when the rank is 2 or more, the number of transmission antennas is not limited. Received signal analysis section 220 estimates transmission antenna weights corresponding to the number of transmission antennas, and determines PMI according to the estimation result. Further, the received signal analysis unit 220 determines CQI from the SNR measured at the time of reception, and transmits the rank, PMI, and CQI to the radio base station 100 via the uplink radio channel.
- a communication stream similar to the data generated by the data generation unit 110 is input to the radio signal conversion unit 123 connected to the transmission antenna 132.
- the same communication stream as that input to the wireless signal converter 123 is input to the wireless signal converter 124 connected to the transmission antenna 133.
- the transmission antenna 131 and the transmission antenna 134 arranged outside the transmission antennas 131 to 134 are not used, and only the transmission antenna 132 and the transmission antenna 133 arranged inside and adjacent to each other are used. used.
- the interval d2 between the transmission antenna 132 and the transmission antenna 133 is set narrow.
- the transmission antenna 132 and the transmission antenna 133 constitute a narrowly spaced antenna group (a narrowly spaced antenna pair).
- the beam forming effect is an effect of improving gain on the receiving side by spatially synthesizing radio waves from a plurality of transmitting antennas and directing directivity (region having a strong electrolytic distribution) in the direction of the receiving side. is there.
- the region where the predetermined electric field strength A can be obtained at the position of the wireless terminal 200 can be expanded.
- the electric field strength is constant regardless of the position of the wireless terminal 200.
- the distance d2 between the transmission antenna 132 and the transmission antenna 133 is 1 ⁇ (predetermined wavelength) or less.
- the beam forming effect becomes remarkable at 1 ⁇ or less, the beam forming effect can be obtained even if it is slightly over 1 ⁇ .
- the distance d1 between the transmission antenna 131 and the transmission antenna 132 and the distance d3 between the transmission antenna 133 and the transmission antenna 134 are about 4 ⁇ in order to improve the transmission diversity effect.
- FIG. 6 is a flowchart showing a transmission parameter determination operation executed in the radio base station 100.
- step S101 the stream determination unit 141 determines whether the number of communication streams is 1 based on the rank fed back from the wireless terminal 200. If it is determined that the number of communication streams is 1, the process proceeds to step S102. If it is determined that there are a plurality of communication streams, the process proceeds to step S103.
- step S102 the antenna selection unit 142 selects the transmission antennas 132 and 133 having the smallest interval as the transmission antennas used for transmission of one communication stream.
- step S103 the antenna weight determination unit 143 determines the transmission antenna weight according to the PMI fed back from the radio terminal 200.
- step S104 the transmission power / modulation method determination unit 144 determines the transmission power and modulation method according to the CQI fed back from the radio terminal 200.
- FIG. 7 shows the characteristics of frequency effective efficiency when the MIMO antenna configurations are 4 ⁇ 2 and 2 ⁇ 2, and the distance between adjacent antennas is set to 4 ⁇ and 10 ⁇ .
- the vertical axis represents the channel capacity, and the horizontal axis represents the reception SNR at the radio terminal 200.
- the total transmission power is set to be the same for both the four transmission antennas and the two transmission antennas.
- the moving speed of the wireless terminal 200 is 3 km / h.
- FIG. 8 shows the result when the moving speed of the wireless terminal 200 is 120 km / h in addition to the configuration shown in FIG.
- the performance is the same regardless of the number of transmission antennas. This indicates that there is no effect of transmission diversity due to transmission antenna weights in an environment where intense channel characteristics exist. In addition, the performance is the same regardless of the antenna interval.
- FIG. 9 shows the result of comparing the antenna spacing 0.5 ⁇ and 10 ⁇ in the 2 ⁇ 2 antenna configuration. Although it is known that the beam forming effect becomes remarkable at an antenna interval of 1 ⁇ or less, the configuration of 1 ⁇ or less in FIG. 9 also ensures stable communication quality without depending on the moving speed of the radio terminal 200. You can see that
- an antenna configuration with high antenna correlation can achieve communication stream transmission that is resistant to propagation path fluctuations.
- a better multiplex communication path can be configured by selecting an antenna configuration that lowers the antenna correlation.
- the transmission antenna unit 130 transmits the transmission antenna when the wireless communication unit 120 transmits only one communication stream at the same time, that is, when the communication quality deteriorates below a predetermined threshold.
- the transmission antennas 132 and 133 having the smallest antenna interval are selected.
- the wireless communication unit 120 transmits the communication stream via the transmission antennas 132 and 133 selected by the antenna selection unit 142.
- the beam forming effect becomes higher than the diversity effect by increasing the correlation between the transmitting antennas, so that the communication quality can be improved. That is, according to the radio base station 100 according to the present embodiment, even when the communication quality is deteriorated below a predetermined threshold in the MIMO communication system, it is possible to realize higher speed and more stable communication.
- the radio base station 100 it is possible to ensure sufficient communication performance even in the case where the fluctuation of the radio channel characteristics is large in the closed-loop MIMO communication system.
- stable MIMO information transmission is possible even in an environment where radio propagation characteristics such as the radio terminal 200 moving at a high speed fluctuate dramatically.
- the beamforming effect can be improved.
- the antenna weight determining unit 143 that determines the transmission antenna weight for weighting the communication stream for each of the transmission antennas 131 to 134 determines the transmission antenna weight for improving the communication quality for each transmission antenna. For this reason, when communication quality deteriorates below a predetermined threshold value, directivity can be directed toward the radio terminal 200, and the beamforming effect can be further improved.
- FIG. 10A is a block diagram showing a configuration of the radio communication unit 120A and the transmission antenna unit 130A according to the second embodiment. Since the configuration of the control unit 140 is the same as that of the first embodiment, the illustration is omitted here.
- the transmission antenna unit 130A is different from the first embodiment in that the transmission antenna unit 130A has one spare transmission antenna 135 that is not used for transmission of a communication stream until the communication quality deteriorates below a predetermined threshold.
- the wireless communication unit 120 ⁇ / b> A includes a wireless signal conversion unit 126 connected between the standby transmission antenna 135 and the data distribution unit 121.
- the interval d4 between the spare transmission antenna 135 and the transmission antenna 134 (specific transmission antenna) adjacent to the spare transmission antenna 135 is 1 ⁇ or less.
- each of the transmission antennas 131 to 135 other than the spare transmission antenna 135 (transmission antenna 131 to transmission antenna 134) (interval d1, interval d2 or interval d3) is larger than 1 ⁇ , for example, about 4 ⁇ . It is.
- the antenna selection unit 142 selects the spare transmission antenna 135 and the transmission antenna 134 when one communication stream is transmitted (when the communication quality deteriorates below a predetermined threshold). As a result, similar to the first embodiment, even when the communication quality is deteriorated below a predetermined threshold, it is possible to realize higher speed and more stable communication.
- the antenna selection unit 142 selects a transmission antenna (transmission antenna 131 to transmission antenna 134) other than the spare transmission antenna 135 when transmitting a plurality of communication streams.
- each interval between the transmission antenna 131 to the transmission antenna 134 is about 4 ⁇ , it is possible to improve the diversity effect when transmitting a plurality of communication streams.
- FIG. 11A is a block diagram illustrating configurations of the wireless communication unit 120B and the transmission antenna unit 130B according to the third embodiment. Since the configuration of the control unit 140 is the same as that of the first embodiment, the illustration is omitted here.
- the transmission antenna unit 130B is different from the first embodiment in that the transmission antenna unit 130B includes two spare transmission antennas 135 and 136 that are not used for transmission of the communication stream until the communication quality deteriorates below a predetermined threshold.
- the radio communication unit 120B also includes a radio signal conversion unit 126 connected between the standby transmission antenna 135 and the data distribution unit 121, and a radio signal conversion connected between the backup transmission antenna 136 and the data distribution unit 121. Part 127.
- the interval d5 between the spare transmission antennas 135 and 136 is 1 ⁇ or less.
- the distance d4 from the antenna 135 is larger than 1 ⁇ , for example, about 4 ⁇ .
- the antenna selection unit 142 selects the spare transmission antennas 135 and 136 when one communication stream is transmitted (when the communication quality deteriorates below a predetermined threshold). As a result, similar to the first embodiment, even when the communication quality is deteriorated below a predetermined threshold, it is possible to realize higher speed and more stable communication.
- the antenna selection unit 142 selects a transmission antenna (transmission antenna 131 to transmission antenna 134) other than the spare transmission antennas 135 and 136 when transmitting a plurality of communication streams. Since the intervals between the transmission antennas 131 to 134 are about 4 ⁇ , the diversity effect during transmission of a plurality of communication streams can be improved as in the second embodiment.
- the MIMO communication method based on the closed loop method using feedback has been described.
- TDD time division multiplexing
- communication is performed on the transmission side using reversibility of the propagation path. Quality can be estimated. Therefore, the present invention can be applied to a MIMO communication system based on an open loop system that does not use feedback.
- the communication in the downlink direction has been mainly described, but it is needless to say that the present invention can also be applied to the communication in the uplink direction.
- the 4 ⁇ 2 antenna configuration has been mainly described.
- the configuration is not limited to the antenna configuration, and a configuration including more antennas or only one receiving antenna (receiving antenna) is used.
- the configuration may be also possible.
- the transmission antennas are arranged in a straight line (linear arrangement), but may be arranged in a semicircular shape or an annular shape.
- linear arrangement in which multi-antenna communication is mounted as a standard, three or more configurations with a linear arrangement are recommended, and a linear arrangement is preferable.
- the wireless communication device and the wireless communication method according to the present invention even when communication quality deteriorates below a predetermined threshold in a multi-input / multi-output wireless communication system, faster and more stable communication is possible. Since continuation can be realized, it is useful in the field of wireless communication such as mobile communication.
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Abstract
Description
第1実施形態では、(1)無線通信システムの概略構成、(2)無線通信システムの詳細構成、(3)アンテナ選択処理、(4)送信パラメータの決定動作、(5)検証結果、(6)作用・効果について説明する。
図1(a)および図1(b)は、第1実施形態に係る無線通信システム10の概略構成図である。無線通信システム10は、無線基地局100および無線端末200を含む。
次に、無線通信システム10の詳細構成について、(2.1)無線基地局の構成、(2.2)無線端末の構成の順に説明する。なお、以下においては、本発明に関連する構成を主に説明する。
図2は、無線基地局100の構成を示すブロック図である。
図3は、無線端末200の構成を示すブロック図である。
次に、図4および図5を用いて、アンテナ選択処理について説明する。
図6は、無線基地局100において実行される送信パラメータの決定動作を示すフローチャートである。
次に、シミュレーションによる検証結果を挙げて、本実施形態によって得られる効果について説明する。
以上説明したように、送信アンテナ部130は、無線通信部120が通信ストリームを同時に1つのみ送信する場合、すなわち、通信品質が所定の閾値よりも劣化した場合、送信アンテナ131~134のうち、アンテナ間隔が最も狭い送信アンテナ132,133を選択する。無線通信部120は、アンテナ選択部142によって選択された送信アンテナ132,133を介して通信ストリームを送信する。
以下の第2実施形態および第3実施形態では、第1実施形態とは異なる送信アンテナ配置について説明する。なお、第2実施形態および第3実施形態では、第1実施形態と異なる点について説明し、重複する説明を省略する。
図11(a)は、第3実施形態に係る無線通信部120Bおよび送信アンテナ部130Bの構成を示すブロック図である。制御部140の構成は第1実施形態と同様であるため、ここでは図示を省略している。
上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述および図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態が明らかとなろう。
Claims (12)
- 送信アンテナを複数含む送信アンテナ部を介して、同一の周波数帯を用いる通信データ系列を受信装置に向けて複数同時に送信する無線通信部を備える無線通信装置であって、
前記無線通信装置と、前記通信データ系列を複数同時に受信して各通信データ系列に分離する前記受信装置との間における無線通信路の通信品質が所定の閾値よりも劣化した場合、前記送信アンテナ部を構成する前記送信アンテナのうち、前記通信品質が前記所定の閾値よりも劣化する前よりも前記送信アンテナの間隔が狭くなる前記送信アンテナを選択するアンテナ選択処理を実行するアンテナ選択部を備え、
前記無線通信部は、前記アンテナ選択部によって選択された前記送信アンテナを介して、前記通信データ系列を送信する無線通信装置。 - 前記アンテナ選択部は、
前記送信アンテナ部を構成する前記送信アンテナのうち、前記受信装置の位置において所定の電界強度が得られる領域が広がる前記送信アンテナの間隔を決定し、
決定した前記送信アンテナの間隔に基づいて前記アンテナ選択処理を実行する請求項1に記載の無線通信装置。 - 前記アンテナ選択部は、前記通信品質が前記所定の閾値よりも劣化した場合、前記送信アンテナ部を構成する前記送信アンテナのうち、前記送信アンテナの間隔が前記周波数帯に対応する所定波長以下となる前記送信アンテナを選択する請求項1に記載の無線通信装置。
- 前記アンテナ選択部は、前記周波数帯の波長を1λとした場合、前記送信アンテナの間隔が1λ以下となる前記送信アンテナを選択する請求項3に記載の無線通信装置。
- 前記送信アンテナ部は、前記所定波長以下の間隔をおいて配置された複数の送信アンテナによって構成される狭間隔アンテナ群を含み、
前記送信アンテナ部を構成する前記送信アンテナのうち、前記狭間隔アンテナ群と異なる送信アンテナ同士の間隔、および前記異なる送信アンテナと前記狭間隔アンテナ群との間隔は、前記所定波長よりも大きく、
前記アンテナ選択部は、前記通信品質が前記所定の閾値よりも劣化した場合、前記狭間隔アンテナ群を選択する請求項3に記載の無線通信装置。 - 前記送信アンテナ部を構成する前記送信アンテナは、
前記通信品質が前記所定の閾値よりも劣化したと判定されるまで前記通信データ系列の送信に使用されない予備送信アンテナと、
前記予備送信アンテナとの間隔が前記所定波長以下となる特定送信アンテナとを含み、
前記送信アンテナ部を構成する前記送信アンテナのうち前記予備送信アンテナ以外の送信アンテナ同士の間隔は、前記所定波長よりも大きく、
前記アンテナ選択部は、前記通信品質が前記所定の閾値よりも劣化した場合、前記予備送信アンテナおよび前記特定送信アンテナを選択する請求項3に記載の無線通信装置。 - 前記送信アンテナ部を構成する前記送信アンテナは、前記通信品質が前記所定の閾値よりも劣化するまで前記通信データ系列の送信に使用されない複数の予備送信アンテナを含み、
前記予備送信アンテナ同士の間隔は、前記所定波長以下であり、
前記送信アンテナ部を構成する前記送信アンテナのうち前記予備送信アンテナと異なる送信アンテナ同士の間隔、および前記異なる送信アンテナと前記予備送信アンテナとの間隔は、前記所定波長よりも大きく、
前記アンテナ選択部は、前記通信品質が前記所定の閾値よりも劣化した場合、前記予備送信アンテナを選択する請求項3に記載の無線通信装置。 - 前記アンテナ選択部は、前記無線通信部が前記通信データ系列を同時に1つのみ送信している場合、前記アンテナ選択処理を実行する請求項1乃至7の何れか一項に記載の無線通信装置。
- 前記通信データ系列を重み付けする送信アンテナ重みを前記送信アンテナ毎に決定する重み決定部をさらに備え、
前記重み決定部は、前記通信品質を向上させる前記送信アンテナ重みを前記送信アンテナ毎に決定する請求項8に記載の無線通信装置。 - 送信アンテナを複数含む送信アンテナ部を介して、同一の周波数帯を用いる通信データ系列を受信装置に向けて複数同時に送信可能な無線通信部を備える無線通信装置であって、
前記通信データ系列を複数同時に受信して各通信データ系列に分離可能な前記受信装置に対して前記無線通信部が送信する前記通信データ系列の数が所定数以下となった場合、前記送信アンテナ部を構成する前記送信アンテナのうち、前記通信データ系列の数が前記所定数以下となる前よりも前記送信アンテナの間隔が狭くなる前記送信アンテナを選択するアンテナ選択処理を実行するアンテナ選択部を備え、
前記無線通信部は、前記アンテナ選択部によって選択された前記送信アンテナを介して、前記通信データ系列を送信する無線通信装置。 - 送信アンテナを複数含む送信アンテナ部を介して、同一の周波数帯を用いる通信データ系列を受信装置に向けて複数同時に送信する無線通信部を用いた無線通信方法であって、
前記無線通信部と、前記通信データ系列を複数同時に受信して各通信データ系列に分離する前記受信装置との間における無線通信路の通信品質が所定の閾値よりも劣化した場合、前記送信アンテナ部を構成する前記送信アンテナのうち、前記通信品質が前記所定の閾値よりも劣化する前よりも前記送信アンテナの間隔が狭くなる前記送信アンテナを選択するステップと、 前記無線通信部が、前記選択するステップにおいて選択された前記送信アンテナを介して、前記通信データ系列を送信するステップと
を含む無線通信方法。
- 送信アンテナを複数含む送信アンテナ部を介して、同一の周波数帯を用いる通信データ系列を受信装置に向けて複数同時に送信可能な無線通信部を用いた無線通信方法であって、
前記通信データ系列を複数同時に受信して各通信データ系列に分離可能な前記受信装置に対して前記無線通信部が送信する前記通信データ系列の数が所定数以下となった場合、前記送信アンテナ部を構成する前記送信アンテナのうち、前記通信データ系列の数が前記所定数以下となる前よりも前記送信アンテナの間隔が狭くなる前記送信アンテナを選択するステップと、
前記無線通信部が、前記選択するステップにおいて選択された前記送信アンテナを介して、前記通信データ系列を送信するステップと
を含む無線通信方法。
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US13/001,593 US8559877B2 (en) | 2008-06-27 | 2009-06-25 | Radio communication device and radio communication method |
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US20110105064A1 (en) | 2011-05-05 |
JP5133413B2 (ja) | 2013-01-30 |
KR101169881B1 (ko) | 2012-07-31 |
EP2293476A1 (en) | 2011-03-09 |
US8559877B2 (en) | 2013-10-15 |
KR20110025670A (ko) | 2011-03-10 |
JPWO2009157513A1 (ja) | 2011-12-15 |
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