WO2009087808A1 - Systeme de communication formant un faisceau analogique - Google Patents

Systeme de communication formant un faisceau analogique Download PDF

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Publication number
WO2009087808A1
WO2009087808A1 PCT/JP2008/070291 JP2008070291W WO2009087808A1 WO 2009087808 A1 WO2009087808 A1 WO 2009087808A1 JP 2008070291 W JP2008070291 W JP 2008070291W WO 2009087808 A1 WO2009087808 A1 WO 2009087808A1
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Prior art keywords
base station
base stations
pattern
communication system
mobile terminal
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PCT/JP2008/070291
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English (en)
Japanese (ja)
Inventor
Shigeru Uchida
Hiroki Iura
Toshiyuki Kuze
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Mitsubishi Electric Corporation
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Publication date
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Priority to JP2009548859A priority Critical patent/JP4906928B2/ja
Publication of WO2009087808A1 publication Critical patent/WO2009087808A1/fr

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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
    • 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

Definitions

  • the present invention relates to an analog beamforming communication system.
  • a radio terminal located at a cell boundary receiving signals from a plurality of base stations.
  • the radio terminal located at the cell boundary may have low received power, and means for solving this is required.
  • a wireless terminal is required to have not only line connectivity but also high speed.
  • the IEEE 802.16e-2005 specification shows a frame configuration when performing DBF.
  • JP 2000-92545 A IEEE Std 802.16e-2005 and IEEE Std 802.16-2004 / Cor1-2005 “Air Interface for Fixed and Mobile Mobile Broadband Wireless Access Systems,” 2006.
  • Beam forming by an array antenna is generally digital beam forming, and frequency conversion units and power amplification units corresponding to the number of antenna elements are required. For this reason, in order to form a beam having a high-gain directivity pattern, a large number of frequency conversion units and power amplification units are required, resulting in an increase in manufacturing cost.
  • the received signal power is low due to the long propagation distance, or because of strong interference power from surrounding sector cells, high robustness and high user There is a problem that it is difficult to achieve wireless communication with throughput.
  • the present invention has been made to solve the above-described problems, and an object thereof is to obtain an analog beamforming communication system in which a base station can select an appropriate analog beam pattern for each mobile terminal.
  • the analog beamforming communication system applies analog beamforming to communication between one or more base stations and one or more mobile terminals, and depends on the position of the mobile terminal or the received signal quality of the mobile terminal.
  • An analog beamforming communication system that performs communication by selecting an appropriate beam, and each of one or more base stations directs a download frame including information indicating a pattern for identifying a beam pattern that can be transmitted by the base station.
  • a beam pattern corresponding to information indicating the pattern is used.
  • Each of the one or more base stations transmits one or more mobiles based on information indicating communication quality information or patterns included in the respective upload frames received from one or more mobile terminals.
  • Terminal grouping is performed, and communication is performed by selecting an appropriate beam from the beam patterns that can be transmitted by each grouped mobile terminal.
  • the data structure of the upload frame and the download frame exchanged between the base station and the mobile terminal is specified, and the mobile terminals are grouped based on the communication quality information on the mobile terminal side that has received the download frame.
  • Embodiment 1 of this invention It is a block diagram of the radio base station apparatus in Embodiment 1 of this invention.
  • Embodiment 1 of this invention it is the figure which showed the frame structure in OFDM / OFDMA when introducing ABF on the basis of IEEE802.16e.
  • Embodiment 1 of this invention it is another figure which showed the frame structure in OFDM / OFDMA when introducing ABF on the basis of IEEE802.16e.
  • Embodiment 1 of this invention It is the figure which showed another frame structure which matches the terminal and beam by the grouping part of Embodiment 1 of this invention. It is a block diagram in case the some radio base station apparatus in Embodiment 1 of this invention cooperates. It is another block diagram in case the some radio base station apparatus in Embodiment 1 of this invention cooperates. It is the figure which showed the interference avoidance technique by the cooperative control between base stations of Embodiment 1 of this invention. It is the figure which showed the frame structure in the case of performing cooperation beam control between base stations in Embodiment 1 of this invention. In Embodiment 1 of this invention, it is an illustration figure in the case of using the cooperation operation
  • Embodiment 2 of this invention It is the figure which showed the frame structure in Embodiment 2 of this invention. It is explanatory drawing of the coping method of the problem in the case of acquiring communication quality information always in Embodiment 2 of this invention. It is the example figure which the base station 130 in Embodiment 3 of this invention transmits different user data using the same frequency and a different beam with respect to two MS. It is a block diagram of the radio base station apparatus in Embodiment 3 of this invention. It is the figure which showed the interference avoidance technique by the cooperative beam control between base stations of Embodiment 4 of this invention. In Embodiment 5 of this invention, it is an illustration figure in the case of using the cooperation operation
  • FIG. 1 is a configuration diagram of a radio base station apparatus according to Embodiment 1 of the present invention.
  • 1 includes a scheduling unit 1, a grouping unit 2, two modulation / demodulation units 3, 4, two frequency conversion units 5, 6, two signal power amplification units 7, 8, It comprises an analog beam control unit 9, an analog beam generation unit 10, and base station antennas 11-15.
  • the number of the series of a frequency conversion part and a signal power amplification part has shown two structures, such a structure is an example to the last, and the number of systems is a base station antenna. Or less.
  • FIG. 1 illustrates an apparatus configuration when two different data are transmitted or received
  • the present invention can achieve a desired object with the same configuration regardless of the number of transmission data. It is.
  • the modem unit 3 and the modem unit 4 modulate user data based on the user data control signals 18 and 19 received from the scheduling unit 1, respectively.
  • modulated signals are converted by the frequency converters 5 and 6 to the frequency of the antenna to be transmitted. Further, these frequency-converted signals are amplified by the signal power amplifiers 7 and 8, respectively. Further, these power amplified signals are input to the analog beam control unit 9.
  • the analog beam control unit 9 determines a beam to be used based on the beam control signal 16 from the scheduling unit 1.
  • a plurality of directivity patterns by ABF are prepared in advance, and the beam control signal 16 is a signal for selecting these directivity patterns prepared in advance.
  • the analog beam generation unit 10 includes an analog passive circuit that forms a beam selected by the analog beam control unit 9. The signal whose phase is adjusted by the analog beam generator 10 is radiated from the base station antennas 11 to 15.
  • FIG. 2 is a diagram showing a frame configuration in OFDM / OFDMA when ABF is introduced based on IEEE 802.16e in Embodiment 1 of the present invention.
  • a case where the DL PUSC frame configuration is applied to the first embodiment will be described as an example.
  • One radio frame is composed of DL_Sub_Frame 20 composed of downlink data and UL_Sub_Frame 21 composed of uplink data.
  • the preamble 22, the FCH 23, the DL-MAP 24, and the UL-MAP 25 are transmitted by an omni antenna or a sector antenna, and all terminals located in the service area of the base station can be decoded.
  • the next radio frame is composed of DL_Sub_Frame 34 and UL_Sub_Frame 35.
  • Preamble 36, FCH 37, DL-MAP 38, and UL-MAP 39 are transmitted by an omni antenna or a sector antenna and are located in the service area of the base station. All of the terminals are decipherable.
  • the Analog BF switching gaps 27 and 41 are time gaps necessary for securing time for switching the directivity pattern.
  • the beam generation circuit consisting of a distributor and a fixed phase shifter is used to switch the beam by an analog switch, or the phase of the variable phase shifter is changed using a beam generation circuit consisting of a distributor and a variable phase shifter. It is conceivable to apply one of the methods of changing the beam by changing the beam.
  • the time required for the beam change varies depending on the equipment used, and the influence of the beam change time on the system varies depending on the symbol time of the system and the system cycle. For this reason, the Analog BF switching gaps 27 and 41 are not necessarily required.
  • Analog BF Preamble 28 Sub_DL_UL_MAP 29, DL_Burst # 1, 30, DL_Burst # 2, and DL_Burst # 3 32 in DL_Sub_Frame20 are transmitted with a beam pattern having a certain directivity, they are transmitted by an omni antenna or a sector antenna.
  • the received signal characteristics power, frequency selectivity, correlation between signals, Doppler fading characteristics, etc. are significantly different depending on the location where the terminal is located.
  • the selected beam has a sharp directivity, it is higher than when using Analog BF Preamble28, Sub_DL_UL_MAP29, DL_Burst # 1, 30, DL_Burst # 2, 31 or DL_Burst # 3 32 with an omni antenna or a sector antenna. There are terminals that can obtain received power.
  • FIG. 2 shows a method of selecting a beam for each subframe.
  • FIG. 3 is another diagram showing a frame configuration in OFDM / OFDMA when ABF is introduced based on IEEE 802.16e in Embodiment 1 of the present invention. This is a method of performing beam selection a plurality of times within one frame, and more specifically, having a plurality of Analog BF Zones 67 and 68 within one frame.
  • the grouping unit 2 assigns each terminal to one or a plurality of beams based on information notified from the terminals, and associates the terminals with the beams. Below, the acquisition method of the information alert
  • FIG. 4 is an exemplary diagram of correspondence between terminals and beams by the grouping unit 2 according to Embodiment 1 of the present invention.
  • the base station 130 has a three-sector configuration including sectors 131 to 133. Only the sector 131 will be described, but the same applies to other sectors.
  • the sector area can be divided into a Beam # 1 area 134 and a Beam # 2 area 135 in the sector 131 by using two directional beams. At this time, it is assumed that each directional beam has a certain angle width, the antenna gain other than that angle is extremely low, and the beam and the terminal are associated by the strength of the received power.
  • Beam # 1 is a beam with high gain in the direction in which MS 136, MS 137, and MS 138, which are mobile stations, are located
  • Beam # 2 is a beam with high gain in the direction in which MS 139 and MS 140 are located. . Therefore, MS136, MS137, and MS138 are associated with Beam # 1, and MS139 and MS140 are associated with Beam # 2.
  • FIG. 5 is a diagram showing a frame configuration for associating terminals and beams by grouping unit 2 according to Embodiment 1 of the present invention, and shows a method of associating beams and terminals using ranging channels. ing. This will be described using a specific frame configuration.
  • Analog BF Preambles 79 and 85 have beam-specific preamble patterns, and beam pattern numbers that can be generated by the base station are assigned according to the patterns. Therefore, a terminal that can decode this preamble can know a beam pattern number that can be decoded, that is, communicated.
  • the terminal can know the received signal characteristics of each beam pattern using this preamble. For example, the terminal associates the reception signal characteristic of each beam pattern with the beam pattern number, and informs the base station of the table of each beam pattern number and reception power using the ranging 91 and 92. Based on this information, the grouping unit 2 of the base station associates terminals with beam numbers.
  • the above example is an example in which the terminal uses the received power of the terminal as a reference for communication information quality, and the terminal associates the beam number with the beam number, and transmits the result to the base station side.
  • a method for evaluating communication quality of a terminal in a communication system differs depending on a transmission system. Therefore, which beam each terminal belongs to is not only the received power, but the frequency selectivity, and if the terminal has multiple antennas, the beam to which it belongs by comprehensive evaluation based on the correlation of the received signals of these antennas. Will be determined.
  • the above example is an example in which the base station associates the terminal with the beam number based on the communication quality information received from the terminal.
  • a method of informing the user may be considered.
  • each terminal uses an orthogonal code when transmitting ranging information in the uplink. Therefore, by associating the orthogonal code number with the beam number to which the base station belongs, the base station can know the beam number to which the terminal belongs when decoding the ranging area.
  • FIG. 6 is a diagram showing another frame configuration for associating terminals and beams by the grouping unit 2 according to Embodiment 1 of the present invention, and is an example in the case of using Beam Selection messages 120 and 121.
  • the information transmitted by Beam Selection messages 120 and 121 is the same as the information transmitted by Ranging 91 and 92, and only the channel used is different.
  • the Beam Selection message may be in the form of a bitmap that can indicate a plurality of usable beam patterns.
  • FIG. 7 is a configuration diagram in the case where a plurality of radio base station apparatuses cooperate in Embodiment 1 of the present invention.
  • FIG. 7 illustrates a configuration in the case where two different radio base station apparatuses 150a and 150b perform a cooperative operation.
  • each of the radio base station devices 150a and 150b is the same as that of the radio base station device 150 of FIG. 1, and the subscripts a and b are attached to the respective components.
  • Each scheduling unit 1a, 1b and grouping unit 2a, 2b in each radio base station apparatus 150a, 150b generates a cooperative operation control signal based on the other party's scheduling information and user grouping information, and transmits it to the other party To do. Thereby, each scheduling part 1a, 1b and grouping part 2a, 2b can cooperate with another base station apparatus, and the coordinated ABF scheduling is attained.
  • FIG. 8 is another configuration diagram when a plurality of radio base station apparatuses in Embodiment 1 of the present invention cooperate.
  • the radio base station apparatuses 150a and 150b cooperate with each other and perform scheduling for cooperative operation in a distributed manner.
  • the inter-base station cooperative control scheduling unit 163 in the inter-base station cooperative control device 162 is used to coordinate the radio base station devices 150 a and 150 b.
  • the scheduling units 1a and 1b in the radio base station apparatuses 150a and 150b transmit scheduling information 164 and 166 to the inter-base station cooperative control scheduling unit 163. Further, the grouping units 2a and 2b in the radio base station apparatuses 150a and 150b transmit user grouping information 165 and 167, respectively.
  • the inter-base station cooperative control scheduling unit 163 performs grouping and scheduling for inter-base station cooperative control based on the sent scheduling information 164 and 166 and user grouping information 165 and 167 of the radio base station apparatuses 150a and 150b.
  • the generated information is sent as a cooperative operation control signal to each of the radio base station apparatuses 150a and 150b. Thereby, the operation
  • FIG. 9 is a diagram showing an interference avoidance technique by inter-base station cooperative control according to Embodiment 1 of the present invention.
  • the base station 186 sets the cell 170 as a service area, and the base station 187 sets the cell 171 as a service area.
  • the MS 181 and the MS 182 exist at the cell boundary between the cell 170 and the cell 171. Therefore, when the base station 186 and the base station 187 transmit signals using an omni antenna or a sector antenna as in the conventional case, for these MS 181 and 182, the signal from the cell to which it does not belong becomes a strong interference wave, Received signal quality deteriorates.
  • interference can be avoided by performing coordinated scheduling control of the beam used in each base station (186, 187) with other base stations (187, 186).
  • the base station 186 transmits to the MS 183 using the Beam 179 and the base station 187 transmits to the MS 181 using the Beam 180, the beam 179 and the Beam 180 are greatly overlapped in the radiation direction.
  • Beam 179 interferes with MS 181.
  • Beam 179 is a beam with high directivity, and therefore has stronger interference than when an omni antenna or a sector antenna is used. Therefore, when performing beam forming, it can be said that cooperative beam control with surrounding base stations is essential.
  • the base station 186 uses the Beam 178 which is a beam having high orthogonality to the Beam 180. Since Beam 180 and Beam 178 have high orthogonality, the power that causes interference with each other is extremely small, and it is possible to simultaneously realize both gain increase by beam and interference avoidance by coordinated beam control between base stations.
  • FIG. 10 is a diagram showing a frame configuration when performing inter-base station cooperative beam control in Embodiment 1 of the present invention. This is a case where the DL_Sub_Frame 189 of the base station 186 and the DL_Sub_Frame 203 of the base station 187 cooperate.
  • the time timing of Analog BF Zone 190 (Beam 178) is synchronized with the time timing of Analog BF Zone 204 (Beam 180), the time timing of Analog BF Zone 191 (Beam 179), and the time timing of Analog BF Zone 205 (Bone 185 Zone 5). is doing.
  • interference can be avoided by selecting beams with high orthogonality between surrounding base stations at the same time timing.
  • FIG. 11 is an exemplary diagram in the case where the cooperative operation between base stations is used as diversity or multi-stream transmission instead of interference avoidance in Embodiment 1 of the present invention.
  • the base station 224 and the base station 225 perform ABF scheduling in cooperation with each other.
  • the MS 226 is located at the cell edge.
  • the Beam 227, which is a beam formed by the base station 224, and the Beam 228, which is a beam formed by the base station 225 have the strongest received power among the beams of each base station. obtain.
  • a terminal located at a cell boundary receives strong interference waves from neighboring base stations.
  • the neighboring base station also communicates with a terminal located at the cell boundary, the interference signal so far becomes a desired signal.
  • the beam frame identification information is included in the data structure of the upload frame exchanged between the base station and the mobile terminal, and the communication quality is included in the data structure of the download frame. Information is included.
  • the mobile terminals can be grouped and beam selected, and the base station can select an appropriate analog beam pattern for each mobile terminal.
  • a beamforming communication system can be obtained.
  • FIG. The second embodiment is a modification of the first embodiment, and will be described below with reference to FIGS. 1, 4, 12, and 13.
  • the configuration of the radio base station apparatus that performs time division control using ABF is the same as that of FIG. 1 used in the first embodiment.
  • an example of association between mobile terminals and beams by the grouping unit 2 in FIG. 1 is the same as that in FIG. 4 used in the first embodiment.
  • FIG. 12 is a diagram showing a frame configuration in the second embodiment of the present invention, and shows a frame configuration in the case where ABF is introduced based on IEEE 802.16e, as in the first embodiment.
  • the permutation method is applicable to all methods such as PUSC (Partial Usage of SubChannels), Band AMC (Adaptive Modulation and Coding).
  • PUSC Partial Usage of SubChannels
  • Band AMC Adaptive Modulation and Coding
  • One radio frame is composed of DL_Sub_Frame 250 composed of downlink data and UL_Sub_Frame 251 composed of uplink data.
  • the preamble 254, the FCH 255, the DL-MAP 256, and the UL-MAP 257 are transmitted using an omni antenna or a sector antenna, and all terminals located in the service area of the base station can be decoded.
  • an Analog BF switching gap is not prepared. As described in the first embodiment, this is an example in which the beam change time is sufficiently shorter than the symbol time of the system and does not require the Analog BF switching gap. Yes.
  • DL_Sub_Frame 250 includes Analog BF Zone 252 that transmits Beam # 1, which is a beam pattern having a certain directivity, and Analog BF Zone 253 that transmits Beam # 2 having a beam pattern different from Beam # 1.
  • DL_Sub_Frame 250 in FIG. 12 exemplifies a case where two zones are included, but the number of DL_Sub_Frames 250 is not limited to two zones, and may be any number. Also, the number of ABF beams need not be limited to two, and may be any number depending on the specifications of the ABF. Furthermore, different radio frames may be transmitted with different beam patterns.
  • Analog BF Zones 252 and 253 The allocation of Analog BF Zones 252 and 253 is specified by DL-MAP256.
  • the Analog BF Zones 252 and 253 include user data and a pilot signal (Dedicated Pilot) in which beam forming is performed in the same manner as user data.
  • MS 136 to MS 140 analyze DL-MAP 256 to identify the allocation of Analog BF Zones 252, 253, and acquire downlink communication quality information (CINR, etc.) for each beam Beam # 1, Beam # 2. be able to.
  • CINR downlink communication quality information
  • the base station 130 (150 in FIG. 1) can instruct the MS 136 to MS 140 to report the communication quality information for each beam in the CQICH 264 in the UL_Sub_Frame 251.
  • the base station 130 acquires the communication quality information of all beams or all beams transmitted by DL_Sub_Frame within a certain period of time from each MS 136 to MS 140.
  • the grouping unit 2 in the base station 130 associates each MS with one or more beams having good communication quality.
  • the example of associating the MS and the beam by the grouping unit 2 has been described with reference to FIG. 4, but the second embodiment is the same as this.
  • FIG. 13 is an explanatory diagram of a method for dealing with a problem when communication quality information is constantly acquired in Embodiment 2 of the present invention.
  • the number of beams that can be transmitted by the base station 283 is 8 per sector.
  • the association between the MS 282 and the beam in the base station 283 is determined by causing the MS to report the communication quality information of each beam as described above.
  • the MS 282 is associated with the area 277 of Beam # 4. Thereafter, the base station 283 does not need to acquire the communication quality information of all beams from the MS 282, and only needs to acquire the communication quality information for Beam # 4.
  • the base station 283 when the base station 283 observes the communication quality information notified from the MS 282 and determines that the communication quality for the Beam # 4 has deteriorated, the MS 282 determines the Beam # 3 that is adjacent to the area 277 of the Beam # 4. It is determined that there is a possibility of moving to the area 276 of Beam # 5 or the area 276 of Beam # 5, and the communication quality for Beam # 3 and Beam # 5 is also periodically reported. Based on the information, the base station 283 switches the correspondence between the MS and each beam.
  • the communication quality information is included in the data structure of the upload frame exchanged between the base station and the mobile terminal.
  • the mobile terminals can be grouped and beam selected, and the base station can select an appropriate analog beam pattern for each mobile terminal.
  • a beamforming communication system can be obtained.
  • Embodiment 3 FIG. In the third embodiment, a case will be described in which the base station transmits different user data using the same frequency and two or more different beams in the first or second embodiment.
  • FIG. 14 is an exemplary diagram in which base station 130 according to Embodiment 3 of the present invention transmits different user data to two MSs using the same frequency and different beams.
  • FIG. 15 is a configuration diagram of the radio base station apparatus according to Embodiment 3 of the present invention.
  • the base station 130 uses the same frequency to transmit data for the MS 297 in the Beam 295 and data for the MS 298 in the Beam 296 at the same time. Even in the case, it is the same.
  • the base station 130 may perform multistream transmission or diversity transmission using Beam295 and Beam296, respectively, using a plurality of antennas.
  • the amount of interference between Beam 295 and Beam 296 may be very large depending on the beam pattern and the positional relationship between MS 297 and MS 298.
  • the modulation / demodulation units 3a, 4a, 3b, and 4b in FIG. 15 perform coding for canceling mutual interference between the data for MS297 and the data for MS298.
  • the description of the other functional units is omitted because it is the same as in the first embodiment.
  • the base station 130 includes four series of frequency converters 5a, 6a, 5b, 6b and signal power amplifiers 7a, 8a, 7b, 8b, and the following equation (1)
  • the determinant of (2) is used (see, for example, Non-Patent Document 2: IEEE C802.16m-08 / 698r1).
  • S [1] is used and transmitted by the Beam 295.
  • S [2] is used and transmitted by the Beam 296.
  • the rows of the matrix indicate the signal systems transmitted to the MS 297 and MS 298 by a series of two frequency converters 5a, 6a, 5b, 6b and signal power amplifiers 7a, 8a, 7b, 8b. Show. Further, the columns of the matrix indicate the time direction. In the case of OFDM / OFDMA, different OFDM / OFDMA symbols are shown, and may be consecutive OFDM / OFDMA symbols, or may be OFDM / OFDMA symbols that differ greatly in time by processing such as Hybrid ARQ. .
  • MS297 acquires data for MS297 by, for example, the following formulas (3) and (4).
  • MS 298 data for MS 298 is acquired by the following formulas (5) and (6).
  • r i is the i-th received symbol
  • h i is the transmission path information of the i-th transmission beam
  • n i ′ is noise.
  • Other processes are the same as those in the first embodiment.
  • Embodiment 3 is not limited to the above code, and any code that reduces inter-beam interference may be used. Further, in Embodiment 3, only downlink transmission is described, but uplink transmission can be considered similarly.
  • the interference between the beams transmitted by the transmitter is significantly reduced by the reception process of the receiver.
  • An analog beamforming communication system can be obtained.
  • FIG. 16 is a diagram illustrating an interference avoidance technique by inter-base station cooperative beam control according to Embodiment 4 of the present invention. Further, the corresponding configuration will be described with reference to FIG. 7 or FIG. 8 used in the first embodiment.
  • the base station 130a communicates with the MS 310 by transmitting Beam 306 and Beam 307, and the base station 130b communicates with the MS 311 by transmitting Beam 308 and Beam 309.
  • S [1] described in the third embodiment is used as data for the MS 310 by the modulation / demodulation unit # 1 3a and modulation / demodulation unit # 2 4a of the base station 130a, and is transmitted as Beam 306 and Beam 307.
  • S [2] described in the third embodiment is used as data for the MS 311 by the modem unit # 1 3b and the modem unit # 2 4b of the base station 130b, and is transmitted as Beam308 and Beam309.
  • an analog beamforming communication system can be obtained that further reduces interference between beams transmitted by a base station during a multi-base station cooperative interference avoidance operation by reception processing of a mobile terminal. Can do.
  • FIG. 17 is an exemplary diagram in the case where the cooperative operation between base stations is used as diversity or multi-stream transmission instead of interference avoidance in Embodiment 5 of the present invention. Further, the corresponding configuration will be described with reference to FIG. 7 or FIG. 8 used in the first embodiment.
  • the base station 130a constituting the cell 320 (150a in FIG. 7 or FIG. 8) or the base station 130b constituting the cell 322 (150b in FIG. 7 or FIG. 8) corresponds to the sector 321 and the sector 323, respectively. As shown in FIG. 7 or FIG. 8, it is assumed that the number of series systems of the frequency conversion unit and the signal power amplification unit is two.
  • the base station 130a transmits Beam 326 and Beam 327, and the base station 130b transmits Beam 328 and Beam 329, thereby performing coordinated transmission to the MS 330 and MS 331 located at the cell edge.
  • S [1] described in the third embodiment is used for data for the MS 330, and the first row of S [1] is used in the modem unit # 1 3a of the base station 130a.
  • the second line of S [1] is used by the modem unit # 13 3b of the base station 130b and transmitted as Beam 328.
  • S [2] described in the third embodiment is used for data for MS 331, and the first row of S [2] is used in modem # 2 4a of base station 130a as Beam 327.
  • the second line of S [2] is used by the modem unit # 24b of the base station 130b and transmitted as Beam 329.
  • an analog beamforming communication system that significantly reduces interference between beams transmitted by a base station at the time of coordinated transmission by a plurality of base stations by reception processing of a mobile terminal. it can.

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  • Radio Transmission System (AREA)

Abstract

Selon l'invention, une station de base peut sélectionner un motif de faisceau analogique approprié pour chaque dispositif terminal. La formation de faisceau analogique est appliquée à un système de communication. Pour qu'une station de base (150) puisse sélectionner un faisceau approprié pour communiquer en fonction d'une position d'un dispositif terminal mobile ou d'une qualité de signal de réception, la station de base (150) transmet une trame de téléchargement contenant des informations indiquant un motif permettant d'identifier un motif de faisceau que la station de base peut transmettre avec un faisceau présentant un modèle de directivité. Lorsqu'un dispositif terminal mobile peut recevoir la trame de téléchargement, ce dispositif transmet une trame de téléversement contenant au moins des informations de qualité de communication ou des informations indiquant un modèle de communication au moyen d'un motif de faisceau correspondant aux informations indiquant un modèle. La station de base (150) regroupe des dispositifs terminaux mobiles en fonction des informations de qualité de communication ou des informations indiquant un modèle contenu dans la trame de téléversement, et elle réalise la communication par sélection d'un faisceau approprié parmi les motifs de faisceau que la station de base peut transmettre pour chaque dispositif terminal mobile regroupé.
PCT/JP2008/070291 2008-01-07 2008-11-07 Systeme de communication formant un faisceau analogique WO2009087808A1 (fr)

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