WO2007111266A1 - 無線通信端末装置及び無線通信基地局装置 - Google Patents
無線通信端末装置及び無線通信基地局装置 Download PDFInfo
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- WO2007111266A1 WO2007111266A1 PCT/JP2007/056069 JP2007056069W WO2007111266A1 WO 2007111266 A1 WO2007111266 A1 WO 2007111266A1 JP 2007056069 W JP2007056069 W JP 2007056069W WO 2007111266 A1 WO2007111266 A1 WO 2007111266A1
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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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
- H04B7/0628—Diversity capabilities
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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
- 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
- H04B7/0634—Antenna weights or vector/matrix coefficients
-
- 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
- H04B7/0636—Feedback format
- H04B7/0643—Feedback on request
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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
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
Definitions
- Wireless communication terminal device and wireless communication base station device are wireless communication terminal devices and wireless communication base station device
- the present invention relates to a radio communication terminal apparatus and a radio communication base station apparatus.
- Standardization of next-generation cellular systems 3GPP LTE (Long Term Evolution) requires a peak rate of 100Mbps downstream, and a MIMO system is introduced as a technology to achieve this.
- Single-User MIMO limits spatial resource allocation to a single user and can be expected to improve the peak rate.
- user multiplexing is performed on the time axis and frequency axis, so there is no user interference on the spatial axis.
- MultHJser MIMO can be expected to improve sector (cell) throughput because multi-user diversity gain can be obtained by allocating spatial resources to multiple users. In particular, when the cell radius is large, the throughput is greatly improved.
- the average sector throughput is improved by up to 15% compared to single-user MIMO and the cell edge user throughput is improved by up to 87%, simulation results are also reported.
- BS base station with two antennas
- UE mobile station with two antennas
- the BS scheduler unit assigns a user with good CQI to each antenna based on CQI (i, j) fed back from each UE, and performs Multi-User MIMO communication.
- UE 1 is assigned to antenna 1 and UE 3 is assigned to antenna 2.
- Non-Patent Document 1 Texas Instruments, 3GPP TSG RAN WGl # 42bis Rl- 051056, "Throu ghput comparison of single user and multi user MIMO for Downlink OFDMA E— UTR A", San Diego, USA, 10-14 October, 2005
- An object of the present invention is to provide a radio communication terminal apparatus and a radio communication base station apparatus that are accommodated in a multi-user MIMO system even when the interference suppression capability is low.
- a radio communication terminal apparatus includes a receiving means for receiving a pilot signal transmitted from a radio communication base station apparatus, channel estimation using the pilot signal, and channel estimation for obtaining a channel estimation value. And a plurality of beam information formed by the radio communication base station apparatus, a desired beam having a maximum reception quality obtained from the channel estimation value, and a beam directed to another user to be subjected to multi-user communication And a beam combination determining means for feeding back the determined beam combination to the radio communication base station apparatus.
- the radio communication base station apparatus of the present invention includes a beam forming means for forming a plurality of beams, a desired beam to which the radio communication terminal apparatus power is also fed back, and a target for multi-user communication.
- Allocation means for allocating wireless communication terminal devices to spatial resources based on the combination information with beams directed to other users and desired beam information to which other wireless communication terminal device forces are fed back, and spatial resources Based on the beam information fed back from the assigned radio communication terminal apparatus, a configuration is adopted that includes beam weight generating means for generating beam weights for controlling the beam forming means.
- the transmission beam forming method of the present invention is based on a plurality of pieces of beam information formed by the radio communication base station apparatus, to a desired beam having the maximum reception quality and to other users who are targets of multi-user communication. Determining a combination with the beam to be directed, feeding back the determined combination of beams from the radio communication terminal apparatus to the radio communication base station apparatus, and based on the feedback beam combination! / And a step of forming a transmission beam for the wireless communication terminal device and the other user.
- the interference suppression capability is low and the radio communication terminal apparatus can be accommodated in the Multi-User MIMO system.
- FIG. 1 Schematic diagram of Multi-User MIMO system disclosed in Non-Patent Document 1
- FIG.2 Conceptual diagram showing the communication mode of Multi-User MIMO system
- FIG. 4 is a diagram showing a weight table of beam yarn alignment information possessed by the beam weight generator shown in FIG.
- FIG. 5 is a flowchart showing the operation of the scheduler unit shown in FIG.
- FIG. 6 is a block diagram showing the configuration of the non-MIMO UE shown in FIG.
- FIG. 7 is a block diagram showing the internal configuration of the beam combination determining unit shown in FIG.
- FIG. 9 is a block diagram showing the configuration of the MIMO UE shown in FIG.
- FIG. 12 is a block diagram showing a configuration of a UE according to Embodiment 2 of the present invention.
- FIG. 13 is a flowchart showing the operation of the beam information determination unit shown in FIG.
- FIG. 14 is a sequence diagram showing an operation between a UE and a BS according to Embodiment 2 of the present invention.
- FIG. 15 is a block diagram showing a BS configuration according to Embodiment 3 of the present invention.
- FIG. 16 is a diagram showing a terminal performance table possessed by the terminal performance determination unit shown in FIG.
- FIG. 17 is a diagram showing an in-cell terminal performance determination table possessed by the terminal performance determination unit shown in FIG.
- FIG. 18 is a block diagram showing a configuration of a UE according to Embodiment 3 of the present invention.
- FIG. 19 is a flowchart showing the operation of the beam information determination unit shown in FIG.
- FIG. 20 is a sequence diagram showing an operation between a UE and a BS according to Embodiment 3 of the present invention.
- the number of BS antennas is set to 2
- the number of UEs accommodated in the BS cell is set to 3.
- the three UEs one is a non-MIMO UE with 1 antenna and the other 2 are MIMO UEs with 2 antennas.
- the BS forms a transmit beam, and this beam information (beam information) is shared between the BS and UE.
- FIG. 3 is a block diagram showing a configuration of the BS shown in FIG.
- transmission buffer section 101-1 accumulates transmission data for non-MIMO UEs and outputs the accumulated transmission data to scheduler section 102.
- the transmission buffer units 101-2 and 101-3 store the transmission data for UE1 and the transmission data for UE2, respectively, and output the stored transmission data to the scheduler unit 102.
- Beamer combination information and non-MIMO CQI described later are fed back to scheduler section 102 from non-MIMO UE, and desired beam information and CQI for each UE are fed back from UE1 and UE2. Based on the fed back information, the scheduler unit 102 sends a spatial resource.
- the transmission data of the allocated users is output as user streams 1 and 2 to modulation sections 103-1 and 103-2, respectively.
- the scheduler unit 102 also outputs CQI corresponding to each user stream to the modulation units 103-1, 103-2. Further, the beam information is output to the beam weight generation unit 104.
- Modulation sections 103-1 and 103-2 determine a modulation scheme and a coding rate (MCS) from the CQI output from scheduler section 102, and determine the determined modulation scheme and code ratio.
- the user stream output from the scheduler unit 102 is modulated and encoded according to the probability.
- the modulated and encoded user stream is output to transmission beam forming section 105.
- the beam weight generation unit 104 includes a weight table shared between the BS and each UE, and also reads out and reads the weight table power corresponding to the beam information output from the scheduler unit 102.
- the beam weight is output to the transmission beam forming unit 105.
- the weight vectors corresponding to each transmission beam are represented as w 1, w 2, w, the beam combination information
- the weight table of report B can be expressed as shown in Fig. 4.
- the weight vector of the desired beam of the MIMO UE that is the target of multi-user communication is w
- each of the weights w and w is combined with the stream index information in the transmission beam forming unit 10.
- the beam information B of each UE is
- the transmission beam forming unit 105 performs weight multiplication on the user stream output from the modulation units 103-1 and 103-2 using the beam weight output from the beam weight generation unit 104, and transmits the transmission beam. Form.
- the weighted user stream is output to RF sections 107-1 and 107-2.
- the user streams output from the modulators 103-1, 103-2 are S and S, respectively, and the weight multiplication is output to the RF units 107-1, 107-2.
- the subsequent streams are X and X, respectively, and the beam output from the beam weight generation unit 104 If weights are set to [w, w], x and ⁇ can be expressed as the following equation (1).
- the no-lot generation unit 106 generates a no-lot signal and transmits the generated pilot signal to the RF unit 1
- RF sections 107-1 and 107-2 perform predetermined radio transmission processing such as up-conversion on the user stream output from transmission beam forming section 105 and the pilot signal output from pilot generation section 106. Then, transmit from antennas 108-1 and 108-2.
- the beam combination information fed back from the non-MIMO UE is represented as B and CQI is represented as CQI comb nonMI. Furthermore, for beam combination information, the desired beam of non-MIMO UE is designated as B (
- the desired beam of MO comb nonMIMO) and MIMO UE is represented as B (MIMO). Also, UE1, UE2 comb
- UEi represents UEi.
- step (hereinafter referred to as “ST”) 401 it is confirmed whether or not the non-MIMO UE exists in the cell.
- the UE When each UE synchronizes with the BS, the UE notifies the BS of terminal information indicating whether the UE is a MIMO UE or a non-MIMO UE. Therefore, the BS determines whether or not there is a non-MIMO UE in the cell. Can be confirmed. If there is a non-MIMO UE, the process proceeds to ST402, and if there is no non-MIMO UE, the process proceeds to ST404.
- the scheduler section 102 assigns a CQI that is a CQI of the non-MIMO UE as a CQI for stream 1, and user stream 1 Is output from the transmission buffer unit 101—1 and nonMIMO
- the beam information output to the beam weight generation unit 104 is the beam combination information B to which the non-MIMO UE power is also fed back.
- the desired beam information B (MIMO) of the MIMO UE notified by the non-MIMO UE matches the desired beam information B of each UE, and another spatial resource is allocated to the UE having the largest CQI.
- the beam information output to beam weight generation section 104 is B.
- the beam information output to the beam weight generation unit 104 is B and B.
- the scheduler unit 102 when there are a plurality of non-M IMO UEs in a power cell in which the number of non-MIMO UEs is 1, the scheduler unit 102 has the largest CQI among the plurality of non-MIMO UEs. Allocate 1 stream to the thing.
- FIG. 6 is a block diagram showing a configuration of the non-MIMO UE shown in FIG.
- the RF unit 502 receives the signal transmitted also with the BS power shown in FIG. 3 via the antenna 501, and performs predetermined radio reception processing such as down-conversion on the received signal.
- predetermined radio reception processing such as down-conversion on the received signal.
- the data portion is output to demodulation section 505, and the pilot signal is output to channel estimation section 503.
- Channel estimation section 503 performs channel estimation using the pilot signal output from RF section 502 and outputs the estimated value to beam combination determination section 504 as channel estimation information.
- the beam combination determining unit 504 uses the channel estimation information output from the channel estimation unit 503 and the beam information shared between the BS and the UE, and uses the beam yarn alignment information and the CQ. I is calculated. The beam combination information and CQI are fed back to the BS shown in Fig.2. Also, the CQI calculated one frame before is output to the demodulator 505. Details of the beam combination determining unit 504 will be described later.
- Demodulation section 505 obtains the modulation scheme and coding rate (MCS) from the CQI output from beam combination decision section 504, and outputs from RF section 502 using the obtained modulation scheme and coding rate.
- MCS modulation scheme and coding rate
- the received data is obtained by demodulating and decoding the received data portion.
- FIG. 7 is a block diagram showing an internal configuration of the beam combination determining unit 504.
- CQI determination section 511 detects the maximum SINR value output from received SINR calculation section 510 and feeds back the detected SINR to the BS as CQI. Also, the beam combination information when SINR is maximized is fed back to the BS. If CQI fed back to the BS is CQI, CQI can be expressed as the following equation (8).
- FIG. 8 is a diagram illustrating a relationship between a gain of a transmission beam formed by three transmission beam weights and a signal arrival direction.
- the solid line is the transmit beam weight w
- the dotted line is the transmit beam weight w
- the alternate long and short dash line is the transmit beam weight w.
- Each of the transmit beams formed by 1 2 3 is shown.
- FIG. 9 is a block diagram showing a configuration of MIMO UE shown in FIG.
- the RF units 802-1 and 802-2 receive the signals transmitted from the BS power shown in FIG. 3 via the antennas 801-1 and 801-2, and downconvert the received signals. Performs predetermined radio reception processing. Of the signal subjected to the radio reception processing, the data portion is output to interference canceling section 804, and the no-lot signal is output to channel estimating section 803.
- Channel estimation section 803 performs channel estimation using the pilot signals output from RF sections 802-1 and 802-2, and uses the estimated value as channel estimation information as interference cancellation section 804 and CQI. Output to the calculation unit 805.
- the interference cancellation unit 804 obtains weights such as ZF and MMSE from the channel estimation information output from the channel estimation unit 803, and outputs the obtained weights from the RF units 802-1 and 802-2. By multiplying the data portion, interference with other users is suppressed and a desired signal is extracted. The signal in which the interference from other users is suppressed is output to demodulation section 806.
- CQI calculation section 805 calculates desired beam information and CQI using channel estimation information output from channel estimation section 803 and beam information shared between BS and UE. Specifically, the CQI when each transmission beam is used is calculated, and the maximum value of the calculated CQI and the transmission beam at this time are fed back to the BS as desired beam information. The CQI one frame before is output to the demodulator 806.
- Demodulation section 806 obtains the modulation scheme and code rate (MCS) from the CQI output from CQI calculation section 805, and outputs it from interference cancellation section 804 using the obtained modulation scheme and coding rate.
- MCS modulation scheme and code rate
- the received signal is demodulated and decoded to obtain received data.
- the BS transmits a pilot signal orthogonal between the BS antennas to each UE, and each UE acquires a channel estimation value using the received pilot signal.
- Each UE calculates CQI (Reception SINR) from the beam information and channel estimation value shared with the BS.
- the MIMO UE is the CQI maximum among the transmission beam candidates included in the beam information.
- the transmitted beam is determined as desired beam information, and the CQI and desired beam information at this time are fed back to the BS.
- the non-MIMO UE includes a transmission beam having a maximum received SIR or SINR and a MIMO UE based on the transmission beam candidate included in the beam information and the transmission beam candidate of the MIMO UE that is the target of multiuser communication.
- the transmission beam is determined as beam combination information, and the CQI and beam combination information at this time are fed back to the BS.
- the BS determines a user to which a spatial resource is allocated.
- UEl is selected as the MIMO UE that wants the same transmit beam as the beam information specified by the non-MIMO UE as the target MIMO UE for the multi-user communication. It shall be.
- the BS forms a multi-beam with beams desired by the non-MIMO UE and UE 1 and transmits downlink data to each UE.
- the transmission beam thus formed is as shown in FIG.
- the amount of interference with non-MIMO UEs is reduced, and non-MIMO UEs can be accommodated in a multi-user MIMO system.
- UE1 is a MIMO UE and has signal separation processing capability, the reception quality of UE1 is not affected even if the interference to UE1 is not reduced. If interference with UE1 is also reduced, UE1's CQI can be improved and the MCS level can be raised, so that throughput can be improved.
- a desired beam of a non-MIMO UE is preferentially assigned to a MIMO UE, and the non-MIMO UE transmits a beam to another MIM O UE that is a target of multiuser communication. Since non-MIMO UEs can reduce interference from other MIMO UEs that perform multi-user communication, it is possible to accommodate non-MIMO UEs in a Multi-User MIMO system. This increases the number of terminals that can be accommodated in the multi-user MIMO system, thereby increasing the multiuser diversity gain and improving the system throughput. In addition, since the beam is selected on the UE side, link adaptation considering the amount of interference can be realized by reporting the reception status when each beam is used from the UE to the BS.
- Embodiment 2 In Embodiment 1, the power for explaining the case where a non-MIMO UE is preferentially assigned a beam to a MIMO UE In Embodiment 2 of the present invention, a MIMO UE having a high channel correlation among a plurality of MIMO UEs The case where beams are preferentially assigned to will be explained.
- the number of BS and UE antennas is set to 2, and the number of UEs accommodated in the BS cell is set to 3 (UE1 to UE3).
- the BS forms a transmission beam, and this beam information (beam information) is shared between the BS and UE.
- FIG. 12 is a block diagram showing a configuration of UE according to Embodiment 2 of the present invention.
- FIG. 12 differs from FIG. 9 in that a correlation detection unit 1101 is added and that the CQI calculation unit 805 is changed to a beam information determination unit 1102.
- correlation detection section 1101 detects channel correlation using channel estimation information output from channel estimation section 803 and outputs the detected channel correlation information to beam information determination section 1102.
- channel estimation information is H
- channel correlation information is p
- p can be expressed by the following equation (9).
- E [] represents the ensemble average, and h and h represent the elements of the MIMO channel matrix H. However, h ⁇ .
- Beam information determination section 1102 calculates CQI based on channel estimation information output from channel estimation section 803, channel correlation information output from correlation detection section 1101, and beam information, and calculates the calculated CQI. Is output to the demodulator 806 and fed back to the BS. Also, desired beam information or beam combination information is generated and fed back to the BS.
- the beam information determining unit 1102 functions as a beam combination determining unit.
- channel correlation information p is equal to or greater than a predetermined threshold Td. If the channel correlation information p is greater than or equal to the threshold value Td, the process proceeds to ST1202, and if the channel correlation information p is less than the threshold value Td, the process proceeds to ST1204.
- a transmission beam combination that maximizes the received SINR is determined as beam combination information from transmission beam candidates in the beam information and transmission beam candidates of other users.
- ST1204 determines a transmission beam having the maximum CQI from the transmission beam candidates in the beam information as a desired beam, and ST1 205 determines the desired beam information and the maximum value. CQI is output.
- the BS transmits a pilot signal orthogonal between the BS antennas to each UE, and each UE acquires a channel estimation value using the received pilot signal.
- Each UE also detects the channel correlation of the channel estimation power.
- each UE calculates CQI (received SINR) from the beam information and channel estimation information shared with the BS.
- CQI calculation method differs depending on the channel correlation information.
- the transmission beam having the maximum CQI is determined as the desired beam information, and the CQI and desired beam information at this time are determined. Is fed back to the BS.
- the transmission beam candidates included in the beam information and the other user's are determined as beam combination information, and the CQI and beam combination information at this time are fed back to the BS.
- the BS determines a user to which a spatial resource is allocated.
- UE3 having a high channel correlation selects UE1 as another user who desires the same transmission beam as the beam information specified for the other user.
- the BS forms a multi-beam with the beams desired by UE3 and UE1, and transmits downlink data to each UE.
- Embodiment 2 a desired beam of a MIMO UE having a high channel correlation is obtained.
- interference from other users of the MIMO UE whose reception SINR has deteriorated due to high channel correlation can be reduced, improving reception SINR.
- System throughput can be improved.
- the BS scheduler section 102 when there are a plurality of users with high channel correlation in a power cell in which the number of users with high channel correlation is 1, the BS scheduler section 102 has the largest CQI. Allocate 1 stream to the thing.
- Embodiment 2 a case has been described in which a beam is preferentially assigned to a MIMO UE having a high channel correlation among a plurality of MIMO UEs.
- Embodiment 3 of the present invention signal separation is performed among a plurality of MIMO UEs. The case where beams are preferentially assigned to MIMO UEs with low processing capabilities is explained.
- the number of BS and UE antennas is 2, and the number of UEs accommodated in the BS cell is 3 (UE1-3).
- the BS forms a transmission beam, and this beam information (beam information) is shared between the BS and UE.
- FIG. 15 is a block diagram showing the configuration of the BS according to Embodiment 3 of the present invention.
- FIG. 15 differs from FIG. 3 in that a terminal performance determination unit 1401 is added.
- terminal performance determination section 1401 obtains UE terminal performance (signal separation capability) information from each UE, and UE determines the terminal performance based on the highest terminal performance in the cell.
- the reference intra-cell terminal performance information is calculated, and the calculated intra-cell terminal performance information is transmitted to each UE.
- Terminal performance determining section 1401 is assumed to share a terminal performance table as shown in FIG. 16 with each UE, for example.
- ZF performs signal separation using the Zero Forcing method
- MMSE performs signal separation using the least square error method
- SIC performs signal separation using a successive interference canceller such as V-BALST.
- MLD shows the signal separation process using the maximum likelihood estimation method.
- the larger the index the higher the signal separation capability.
- the terminal performance determination unit 1401 uses the index information as terminal performance information Rc. UE power is reported, and based on the in-cell terminal performance determination table shown in FIG. 17, the reported terminal performance information Rc and in-cell terminal performance information Be are determined.
- the standard is the same.
- Be 0 is set so that each UE does not judge its own terminal performance.
- the receiving performance other than that shown in FIG. 16 may be introduced by increasing the terminal performance level by dividing the terminal performance into four levels.
- the terminal performance in a cell can be determined flexibly according to the stage of terminal performance.
- FIG. 18 is a block diagram showing a configuration of a UE according to Embodiment 3 of the present invention. 18 is different from FIG. 12 in that the correlation detection unit 1101 is deleted and the beam information determination unit 1102 is changed to a beam information determination unit 1701.
- Beam information determination section 1701 determines the terminal performance of the own terminal based on the intra-cell terminal performance information Be transmitted from the BS, and calculates and calculates CQI according to the terminal performance of the own terminal.
- the CQI is output to the demodulator 806 and fed back to the BS.
- desired beam information or beam combination information is generated and fed back to the BS.
- the beam information determination unit 1701 functions as a beam combination determination unit.
- Terminal performance information Rc is the cell
- the BS requests each UE to notify the UE of the terminal performance in order to grasp the signal separation capability of each UE.
- each UE notifies the BS of the signal separation capability.
- the BS reports in-cell terminal performance information to all UEs as information serving as a reference for each UE in the cell to determine the signal separation capability based on the signal separation capability notified from each UE.
- Each UE judges its own signal separation capability based on the reported in-cell terminal performance information.
- UE1 and UE2 are determined to be UEs with high signal separation capability
- UE3 is determined to be a UE with low signal separation capability.
- the BS transmits a pilot signal orthogonal between the BS antennas to each UE, and each UE acquires a channel estimation value using the received pilot signal.
- Each UE calculates CQI (Reception SINR) from the beam information and channel estimation information shared with the BS.
- CQI calculation method differs depending on the signal separation capability of each UE.
- the transmission beam having the maximum CQI is determined as desired beam information, and the CQI at this time is determined. And the desired beam information are fed back to the BS.
- UE3 since UE3 is assumed to have low signal separation capability, it is considered that UE3 is prioritized for beam assignment to other users. Based on the transmission beam candidates of other users, the transmission beam with the maximum received SIR or SINR and the transmission beam of the MIMO UE are determined as beam combination information, and the CQI and beam combination information at this time are fed back to the BS. .
- the BS determines a user to which a spatial resource is allocated.
- UE3 having a high channel correlation selects UE1 as another user who desires the same transmission beam as the beam information specified for the other user.
- the BS forms a multi-beam with the beams desired by UE3 and UE1, and transmits downlink data to each UE.
- a desired beam of a UE having a relatively low signal separation capability in a cell is preferentially assigned to a UE having a high signal separation capability. With a low signal separation capability, the UE can reduce interference from other users.
- the number of terminals with low signal separation capability is set to 1.
- BS scheduler section 102 has CQI among them. Allocate one stream for the largest.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- LSI due to the difference in the power integration of LSI,
- IC system LSI
- super LSI super LSI
- ultra LSI ultra LSI
- circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- An FPGA Field Programmable Gate Array
- reconfigurable 'processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.
- the base station (BS) in the above embodiment may be expressed as Node B.
- the radio communication terminal apparatus and radio communication base station apparatus can accommodate a radio communication terminal apparatus with low interference suppression capability in a MultHJser MIMO system, and can be applied to a Multi-U ser MIMO system.
Abstract
Description
Claims
Priority Applications (3)
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EP07739510A EP1988653A1 (en) | 2006-03-24 | 2007-03-23 | Radio communication terminal and radio communication base station device |
JP2008506871A JP4898786B2 (ja) | 2006-03-24 | 2007-03-23 | 無線通信端末装置及び無線通信基地局装置 |
US12/293,528 US20090291702A1 (en) | 2006-03-24 | 2007-03-23 | Radio communication terminal and radio communication base station device |
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JP2006-083897 | 2006-03-24 | ||
JP2006083897 | 2006-03-24 |
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WO2007111266A1 true WO2007111266A1 (ja) | 2007-10-04 |
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ID=38541183
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PCT/JP2007/056069 WO2007111266A1 (ja) | 2006-03-24 | 2007-03-23 | 無線通信端末装置及び無線通信基地局装置 |
Country Status (4)
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US (1) | US20090291702A1 (ja) |
EP (1) | EP1988653A1 (ja) |
JP (1) | JP4898786B2 (ja) |
WO (1) | WO2007111266A1 (ja) |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004194262A (ja) * | 2002-10-18 | 2004-07-08 | Ntt Docomo Inc | 信号伝送システム、信号伝送方法及び送信機 |
JP2006005908A (ja) * | 2004-05-20 | 2006-01-05 | Matsushita Electric Ind Co Ltd | 無線通信システム、無線通信方法、基地局装置及び端末装置 |
JP2006083897A (ja) | 2004-09-14 | 2006-03-30 | Ntn Corp | チルトヒンジ |
JP2006333482A (ja) * | 2005-05-24 | 2006-12-07 | Ntt Docomo Inc | ランダムビームフォーミング方式によるmimo通信システム及びそのユーザスケジューリング方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060264184A1 (en) * | 2005-02-17 | 2006-11-23 | Interdigital Technology Corporation | Method and apparatus for selecting a beam combination of multiple-input multiple-output antennas |
-
2007
- 2007-03-23 US US12/293,528 patent/US20090291702A1/en not_active Abandoned
- 2007-03-23 EP EP07739510A patent/EP1988653A1/en not_active Withdrawn
- 2007-03-23 JP JP2008506871A patent/JP4898786B2/ja not_active Expired - Fee Related
- 2007-03-23 WO PCT/JP2007/056069 patent/WO2007111266A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004194262A (ja) * | 2002-10-18 | 2004-07-08 | Ntt Docomo Inc | 信号伝送システム、信号伝送方法及び送信機 |
JP2006005908A (ja) * | 2004-05-20 | 2006-01-05 | Matsushita Electric Ind Co Ltd | 無線通信システム、無線通信方法、基地局装置及び端末装置 |
JP2006083897A (ja) | 2004-09-14 | 2006-03-30 | Ntn Corp | チルトヒンジ |
JP2006333482A (ja) * | 2005-05-24 | 2006-12-07 | Ntt Docomo Inc | ランダムビームフォーミング方式によるmimo通信システム及びそのユーザスケジューリング方法 |
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Also Published As
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JPWO2007111266A1 (ja) | 2009-08-13 |
EP1988653A1 (en) | 2008-11-05 |
US20090291702A1 (en) | 2009-11-26 |
JP4898786B2 (ja) | 2012-03-21 |
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