WO2011136113A1 - データ送信方法、基地局装置及び移動局装置 - Google Patents
データ送信方法、基地局装置及び移動局装置 Download PDFInfo
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- WO2011136113A1 WO2011136113A1 PCT/JP2011/059784 JP2011059784W WO2011136113A1 WO 2011136113 A1 WO2011136113 A1 WO 2011136113A1 JP 2011059784 W JP2011059784 W JP 2011059784W WO 2011136113 A1 WO2011136113 A1 WO 2011136113A1
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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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] 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
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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
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for 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
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—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
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
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- 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
- H04B7/0665—Feed forward of transmit weights to the receiver
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03375—Passband transmission
- H04L2025/03414—Multicarrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
Definitions
- the present invention relates to a data transmission method, a base station apparatus, and a mobile station apparatus, and more particularly, to a data transmission method, base station apparatus, and mobile station apparatus that support multi-antenna transmission.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- LTE Long Term Evolution
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE-A LTE Advanced
- LTE-A LTE Advanced
- a MIMO (Multi Input Multi Output) system has been proposed as a wireless communication technology that improves data rate (frequency utilization efficiency) by transmitting and receiving data with a plurality of antennas (for example, non-patented).
- Reference 1 a MIMO system, a plurality of transmission / reception antennas are prepared in a transmitter / receiver, and different transmission information sequences are transmitted simultaneously from different transmission antennas.
- the data rate frequency utilization efficiency
- the data rate is increased by separating and detecting simultaneously transmitted information sequences using the fact that different fading fluctuations occur between transmission / reception antennas. Is possible.
- the mobile station apparatus UE that is a receiver can appropriately grasp the number of antennas of the base station apparatus eNodeB that is a transmitter (hereinafter referred to as “the number of transmission antennas” as appropriate) And when the said mobile station apparatus UE supports the data communication by the said number of transmitting antennas, it becomes possible to increase a data rate (frequency utilization efficiency) to the maximum.
- the mobile station apparatus UE when the mobile station apparatus UE cannot properly grasp the number of transmission antennas, subsequent data communication may be disabled. Even if the number of transmission antennas can be properly grasped, if the mobile station apparatus UE does not support data communication using the number of transmission antennas, the number corresponds to the number of antennas of the mobile station apparatus UE. Increasing the data rate can be difficult. From the viewpoint of increasing the data rate, even in such a case, it is preferable to perform data communication with the number of transmission antennas that can increase the data rate most from the number of transmission antennas and the number of transmission antennas supported by the mobile station apparatus UE. .
- the present invention has been made in view of such a situation, and even when the number of transmission antennas of the base station apparatus is different from the number of transmission antennas of the base station apparatus supported by the mobile station apparatus, data at the time of MIMO transmission is provided. It is an object of the present invention to provide a data transmission method, a base station apparatus, and a mobile station apparatus that can increase the rate to the maximum.
- the data transmission method of the present invention includes a step of notifying the mobile station device of the number of transmission antennas of the base station device, and the number of transmission antennas in the mobile station device and the maximum number of support antennas of the base station device supported by the mobile station device. Comparing the number of antennas with each other, selecting a smaller number of antennas as the number of pseudo antennas, notifying the number of pseudo antennas to the base station device, and receiving a data channel signal from the base station device according to the number of pseudo antennas. And a transmitting step.
- the smaller number of antennas is selected as the number of pseudo antennas out of the number of transmission antennas of the base station device and the maximum number of support antennas of the base station device supported by the mobile station device,
- a data channel signal is transmitted.
- data transmission can be performed with the number of pseudo antennas that can increase the data rate most effectively between the number of transmission antennas of the base station apparatus and the number of support antennas of the mobile station apparatus. Even when the number is different from the number of antennas of the base station apparatus supported by the mobile station apparatus, the data rate at the time of MIMO transmission can be maximized.
- the number of transmission antennas of the base station apparatus is notified, and the number of pseudo antennas is selected based on the number of transmission antennas, so that it is impossible to properly grasp the number of transmission antennas of the base station apparatus and subsequent data communication is impossible. Can be avoided.
- the base station apparatus of the present invention includes antenna information transmitting means for transmitting the number of transmission antennas included in the own apparatus to the mobile station apparatus, and among the maximum number of support antennas of the base station apparatus supported by the number of transmission antennas and the mobile station apparatus.
- the data channel signal depends on the number of pseudo antennas configured with the smaller number of antennas among the number of transmission antennas of the base station device and the maximum number of support antennas of the base station device supported by the mobile station device. Is sent.
- data transmission can be performed with the number of pseudo antennas that can increase the data rate most effectively between the number of transmission antennas of the base station apparatus and the number of support antennas of the mobile station apparatus. Even when the number is different from the number of antennas of the base station apparatus supported by the mobile station apparatus, the data rate at the time of MIMO transmission can be maximized.
- the mobile station apparatus of the present invention comprises a receiving means for receiving the number of transmission antennas of a base station apparatus, and the smaller number of antennas compared with the number of transmission antennas and the maximum number of support antennas of the base station apparatus supported by the own apparatus. It comprises selection means for selecting the number as the number of pseudo antennas, and antenna information transmission means for transmitting the number of pseudo antennas to the base station apparatus.
- the smaller number of antennas is selected as the number of pseudo antennas out of the number of transmission antennas of the base station device and the maximum number of support antennas of the base station device supported by the mobile station device, and transmitted to the base station device. Therefore, it is possible to notify the base station apparatus of the number of pseudo antennas that can increase the data rate most effectively between the number of transmission antennas of the base station apparatus and the number of support antennas of the mobile station apparatus.
- the data channel signal is transmitted according to the number of pseudo antennas in the base station apparatus, so that data is most effectively transmitted between the number of transmission antennas of the base station apparatus and the number of support antennas of the mobile station apparatus.
- the smaller number of antennas is selected as the number of pseudo antennas out of the number of transmission antennas of the base station device and the maximum number of support antennas of the base station device supported by the mobile station device,
- a data channel signal is transmitted.
- data transmission can be performed with the number of pseudo antennas that can increase the data rate most effectively between the number of transmission antennas of the base station apparatus and the number of support antennas of the mobile station apparatus. Even when the number is different from the number of antennas of the base station apparatus supported by the mobile station apparatus, the data rate at the time of MIMO transmission can be maximized.
- FIG. 1 is a conceptual diagram of a MIMO system to which a data transmission method according to the present invention is applied. It is a sequence diagram for demonstrating the data transmission method which concerns on the 1st aspect of this invention. It is a sequence diagram for demonstrating the data transmission method which concerns on the 2nd aspect of this invention. It is a sequence diagram for demonstrating the data transmission method which concerns on the 3rd aspect of this invention. It is a figure for demonstrating the structure of the mobile communication system which concerns on one embodiment of this invention. It is a block diagram which shows the structure of the mobile station apparatus which concerns on the said embodiment. It is a block diagram which shows the structure of the base station apparatus which concerns on the said embodiment.
- FIG. 1 is a conceptual diagram of a MIMO system to which a data transmission method according to the present invention is applied.
- the base station apparatus eNodeB and the user terminal UE are each provided with four antennas.
- the mobile station apparatus UE measures the channel fluctuation amount using the received signal from each antenna, and based on the measured channel fluctuation quantity, the base station apparatus eNodeB PMI and RI are selected according to the phase / amplitude control amount (precoding weight) that maximizes the throughput (or reception SINR) after combining the transmission data from each transmission antenna. Then, the selected PMI and RI are fed back to the base station apparatus eNodeB in the uplink together with CQI (Channel Quality Indicator) indicating channel quality information.
- CQI Channel Quality Indicator
- the signal separation / decoding unit 11 separates and decodes the control channel signal and the data channel signal included in the reception signals received via the reception antennas RX # 1 to RX # 4. .
- a data channel signal for the mobile station apparatus UE is reproduced by performing a decoding process in the signal separation / decoding unit 11.
- the PMI selection unit 12 selects a PMI according to the channel state estimated by a channel estimation unit (not shown). At this time, the PMI selection unit 12 determines the known N precoding weights determined for each rank in both the mobile station apparatus UE and the base station apparatus eNodeB, and the PMIs associated with the precoding matrix. The optimum PMI is selected from the code book 13.
- the RI selection unit 14 selects an RI according to the channel state estimated by the channel estimation unit. These PMI and RI are transmitted as feedback information to the base station apparatus eNodeB together with the CQI.
- the precoding weight generation unit 21 generates a precoding weight based on the PMI and RI fed back from the mobile station apparatus UE.
- the precoding multiplication unit 22 multiplies the transmission signal parallel-converted by the serial / parallel conversion unit (S / P) 23 by the precoding weight, thereby obtaining the phase / amplitude for each of the transmission antennas TX # 1 to TX # 4. Control (shift) each. As a result, the phase / amplitude-shifted transmission data is transmitted from the four transmission antennas TX # 1 to TX # 4.
- the LTE system supports 1, 2 and 4 antennas as the number of transmission antennas of the base station apparatus eNodeB.
- the number of transmission antennas of the base station apparatus eNodeB is set to be equal to the number of antenna ports of RS (CRS: Cell Specific Reference Signal) common to cells in principle.
- RS Cell Specific Reference Signal
- PBCH Physical Broadcast Channel
- SFBC space frequency block coding
- FTSD frequency time switching transmit diversity
- the mobile station apparatus UE performs blind detection of MIB (Master Information Block) information in the PBCH, and the number of transmission antennas when it can be accurately demodulated is transmitted to the base station apparatus eNodeB. Know the number of antennas. That is, in the LTE system, the number of transmission antennas of the base station apparatus eNodeB can be grasped indirectly through blind detection of MIB information in the PBCH from the base station apparatus eNodeB.
- MIB Master Information Block
- the number of transmission antennas of the base station apparatus eNodeB is scheduled to support 8 antennas in addition to 1, 2 and 4 antennas.
- the LTE-A system only four antennas are prepared for the number of CRS antenna ports.
- transmission diversity based on the number of CRS antenna ports for example, SFBC or a combination of SFBC and FTSD is used in principle, as in the LTE system.
- the number of transmission antennas of the base station apparatus eNodeB is 8 antennas, any one of these transmission diversity methods is used as appropriate.
- the mobile station apparatus UE transmits the number of transmission antennas of the base station apparatus eNodeB obtained through blind detection of MIB information in the PBCH and the actual transmission of the base station apparatus eNodeB. A situation where the number of antennas is different may occur. Thus, when the mobile station apparatus UE cannot properly grasp the number of transmission antennas of the base station apparatus eNodeB, subsequent data communication may be disabled.
- the mobile station apparatus UE Even when the number of transmission antennas of the base station apparatus eNodeB can be properly grasped, if the mobile station apparatus UE does not support data communication using the number of transmission antennas, the mobile station apparatus UE It may be difficult to increase the data rate commensurate with the number of transmission antennas that are provided. For example, such a situation may occur when the LTE-A specification base station apparatus eNodeB performs data communication with the LTE specification mobile station apparatus UE. From the viewpoint of increasing the data rate, even in such a case, the data rate can be increased most from the number of transmission antennas of the base station apparatus and the maximum number of transmission antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE.
- the present inventor has found that the number of transmission antennas of the base station apparatus eNodeB cannot be properly grasped as described above, and that subsequent data communication can be disabled. In view of the fact that the number of transmission antennas of the base station apparatus eNodeB supported by the base station apparatus differs from that of the base station apparatus eNodeB, it is difficult to increase the data rate during MIMO transmission.
- the mobile station apparatus UE is notified of the number of transmission antennas of the base station apparatus eNodeB. Then, in the mobile station apparatus UE, among the number of transmission antennas notified from the base station apparatus eNodeB and the number of transmission antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE (hereinafter referred to as “number of support antennas”), Compare the maximum number of support antennas. Among these, the smaller number of antennas is selected as the number of pseudo antennas, and this number of pseudo antennas is notified to the base station apparatus eNodeB. Next, the base station apparatus eNodeB transmits a data channel signal using the MIMO transmission technique according to the number of pseudo antennas notified from the mobile station apparatus UE.
- the smaller number of antennas is used as the number of pseudo antennas.
- the data channel signal is transmitted according to the number of pseudo antennas selected.
- the base station apparatus eNodeB Even when the number of transmission antennas is different from the number of antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE, the data rate at the time of MIMO transmission can be increased to the maximum.
- the number of transmission antennas of the base station apparatus eNodeB is notified, and the number of pseudo antennas is selected based on the number of transmission antennas. It becomes possible to avoid the situation where it becomes impossible.
- the data transmission method according to the present invention is executed when the mobile station apparatus UE is activated.
- the information multiplexed to notify the mobile station apparatus UE of the number of transmission antennas of the base station apparatus eNodeB is different.
- the number of transmission antennas of the base station apparatus eNodeB is multiplexed with the MIB information and transmitted.
- the number of transmission antennas of the base station apparatus eNodeB is multiplexed with SIB (System Information Block) information and transmitted.
- SIB System Information Block
- FIG. 2 is a sequence diagram for explaining the data transmission method according to the first aspect of the present invention.
- the number of transmission antennas of the base station apparatus eNodeB is multiplexed with MIB information and transmitted to the mobile station apparatus UE. (Step (hereinafter referred to as “ST”) 11).
- the MIB information from the base station apparatus eNodeB is demodulated. Then, when the number of transmission antennas of the base station apparatus eNodeB is detected from the MIB information, a comparison process is performed for comparing the number of transmission antennas with the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE ( ST12). As a result of this comparison processing, the smaller number of antennas among the number of transmission antennas and the maximum number of support antennas is selected as the number of pseudo antennas Nmin . Then, the selected number of pseudo antennas N min is notified to the base station apparatus eNodeB by an RRC message (ST13).
- the mobile station apparatus UE specifies the maximum number of supported antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE, based on the content of UE capability indicating the performance information of the own apparatus.
- the number of support antennas it may be specified based on the content of the UE category indicating the performance information of the own device.
- the number of pseudo antennas N min can be selected without requiring complicated processing.
- the base station apparatus eNodeB When the notification of the number of pseudo antennas N min is received by the RRC message, the base station apparatus eNodeB performs a setting process required when transmitting by the MIMO transmission technique using the number of pseudo antennas N min (ST14). In this setting processing, for example, processing such as selection of RI and PMI based on a code book corresponding to the number of pseudo antennas N min is performed. This setting process, when the number of transmission antennas of the base station apparatus eNodeB and the pseudo-antenna number N min is also different, and it can transmit the data channel signal using a pseudo number of antennas N min.
- a data channel signal (PDSCH: Physical Downlink Shared Channel) is transmitted to the mobile station apparatus UE according to the number of pseudo antennas N min (ST15).
- PDSCH Physical Downlink Shared Channel
- the operation when the number of transmission antennas of the base station apparatus eNodeB is 8 antennas and the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE is 4 antennas will be described.
- information indicating that the transmission antennas of the base station apparatus eNodeB are 8 antennas is multiplexed with the MIB information and transmitted to the mobile station apparatus UE (ST11).
- 8 antennas that are transmission antennas and 4 antennas that are the largest number of support antennas are compared, and 4 antennas are selected as the number of pseudo antennas N min (ST12).
- 4 antennas as the number of pseudo antennas are notified to the base station apparatus eNodeB by an RRC message (ST13).
- a setting process required when data is transmitted by the MIMO transmission technique using four antennas having the number of pseudo antennas N min is performed (ST14).
- a data channel signal (PDSCH) is transmitted to the mobile station apparatus UE according to 4 antennas which are the number of pseudo antennas N min (ST15).
- data transmission is performed by selecting single user MIMO that transmits data to the same mobile station apparatus UE using four antennas or multiuser MIMO that transmits data to a plurality of mobile station apparatuses UE. It becomes possible.
- the number of transmission antennas of the base station apparatus eNodeB (for example, 8 antennas), the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE (for example, 4 antennas) among the lesser number of antennas pseudo number of antennas (e.g., selected as 4 antenna), a data channel signal (PDSCH) is transmitted in response to the pseudo-antenna number N min.
- the number of transmission antennas of the base station apparatus eNodeB for example, 8 antennas
- the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE for example, 4 antennas among the lesser number of antennas pseudo number of antennas (e.g., selected as 4 antenna)
- PDSCH data channel signal
- the base station apparatus eNodeB Even when the number of transmitting antennas is different from the number of supporting antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE, the data rate at the time of MIMO transmission can be increased to the maximum.
- the mobile station apparatus UE since the mobile station apparatus UE is notified by multiplexing the number of transmission antennas of the base station apparatus eNodeB with the MIB information and transmitting it, the base station can be detected with high accuracy and early. It becomes possible to notify the mobile station apparatus UE of the number of transmission antennas of the apparatus eNodeB.
- FIG. 3 is a sequence diagram for explaining the data transmission method according to the second aspect of the present invention.
- processes that are the same as those in FIG. 2 are given the same reference numerals, and descriptions thereof are omitted.
- data transmission according to the first aspect is performed at a point (ST21) in which the number of transmission antennas of the base station apparatus eNodeB is multiplexed with the SIB information (ST21). It is different from the method.
- the SIB information from the base station apparatus eNodeB is demodulated, and the number of transmitting antennas of the base station apparatus eNodeB included in the SIB information is detected.
- the processing after the comparison processing using the detected number of transmission antennas is common to the data transmission method according to the first aspect.
- the number of transmission antennas of the base station apparatus eNodeB, the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE Among the numbers, the smaller number of antennas is selected as the number of pseudo antennas N min , and the data channel signal (PDSCH) is transmitted according to the number of pseudo antennas.
- the data transmission can be performed with the number of pseudo antennas N min that can increase the data rate most effectively between the number of transmission antennas of the base station device eNodeB and the number of support antennas of the mobile station device UE. Even when the number of transmission antennas of the device eNodeB is different from the number of support antennas of the base station device eNodeB supported by the mobile station device UE, the data rate at the time of MIMO transmission can be maximized.
- the base station apparatus eNodeB notifies the mobile station apparatus UE by multiplexing and transmitting the number of transmission antennas of the base station apparatus eNodeB to the SIB information. It becomes possible to notify the mobile station apparatus UE of the number of transmission antennas of the apparatus eNodeB.
- FIG. 4 is a sequence diagram for explaining the data transmission method according to the third aspect of the present invention.
- the processes common to those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted.
- the data according to the first aspect is the point (ST31) in which the number of transmission antennas of the base station apparatus eNodeB is multiplexed with the RRC signaling information and transmitted. It differs from the transmission method.
- the mobile station apparatus UE demodulates the RRC signaling information from the base station apparatus eNodeB, and detects the number of transmission antennas of the base station apparatus eNodeB included in the RRC signaling information.
- the processing after the comparison processing using the detected number of transmission antennas is common to the data transmission method according to the first aspect.
- the number of transmission antennas of the base station apparatus eNodeB can be multiplexed with the number of antenna ports of CSI-RS included in the RRC signaling information.
- CSI-RS antenna port number information is explicitly or implicitly included in RRC signaling information. In this way, by multiplexing the CSI-RS antenna port number information included in the RRC signaling information, the CSI-RS antenna port number information is demodulated to detect the actual number of transmission antennas of the base station apparatus eNodeB. It becomes possible.
- the number of transmission antennas of the base station apparatus eNodeB, the maximum number of support antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE Among the numbers, the smaller number of antennas is selected as the number of pseudo antennas N min , and the data channel signal (PDSCH) is transmitted according to the number of pseudo antennas.
- the base station apparatus eNodeB Even when the number of transmitting antennas is different from the number of supporting antennas of the base station apparatus eNodeB supported by the mobile station apparatus UE, the data rate at the time of MIMO transmission can be increased to the maximum.
- the mobile station apparatus UE since the mobile station apparatus UE is notified by multiplexing the number of transmission antennas of the base station apparatus eNodeB with the RRC signaling information and transmitting it, the MIB information and the SIB information are included. Compared to the case of multiplexing, the mobile station apparatus UE can be flexibly notified of the number of transmission antennas of the base station apparatus eNodeB without being restricted by the amount of information.
- the number of transmission antennas used for data transmission until the data channel signal (PDSCH) is transmitted according to the number of pseudo antennas N min from the base station apparatus eNodeB. Will not be finalized. Therefore, in the data transmission methods according to the first to third aspects, transmission using the common pilot channel signal until the data channel signal (PDSCH) is transmitted from the base station apparatus eNodeB according to the number of pseudo antennas N min A data channel signal is transmitted using diversity (that is, transmission diversity that is the same as transmission diversity used in PBCH).
- FIG. 5 is a diagram for explaining a configuration of the mobile communication system 1 including the mobile station apparatus 10 and the base station apparatus 20 according to the embodiment of the present invention.
- the mobile communication system 1 shown in FIG. 5 is a system including, for example, an LTE system or SUPER 3G.
- the mobile communication system 1 may be called IMT-Advanced or 4G.
- the mobile communication system 1 includes a base station device 20 and a plurality of mobile station devices 10 (10 1 , 10 2 , 10 3 ,... 10 n , n communicating with the base station device 20. Is an integer of n> 0).
- the base station apparatus 20 is connected to the higher station apparatus 30, and the higher station apparatus 30 is connected to the core network 40.
- the mobile station device 10 communicates with the base station device 20 in the cell 50.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- each mobile station apparatus (10 1 , 10 2 , 10 3 ,... 10 n ) has the same configuration, function, and state, the following description will be given as the mobile station apparatus 10 unless otherwise noted. Proceed. For convenience of explanation, it is assumed that the mobile station device 10 is in radio communication with the base station device 20, but more generally, user equipment (UE: User Equipment) including both a mobile terminal device and a fixed terminal device. It's okay.
- UE User Equipment
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single carrier transmission method that reduces interference between terminals by dividing a system band into bands each consisting of one or continuous resource blocks for each terminal, and a plurality of terminals using different bands. .
- PDSCH shared by each mobile station device 10, downlink L1 / L2 control channel (PDCCH (Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) ) And are used.
- PDCH Physical Downlink Control Channel
- PCFICH Physical Control Format Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- User data that is, a normal data signal is transmitted by this PDSCH. Transmission data is included in this user data.
- the CC and scheduling information assigned to the mobile station device 10 by the base station device 20 are notified to the mobile station device 10 through the L1 / L2 control channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data is transmitted by this PUSCH.
- CQI downlink radio quality information
- FIG. 6 is a block diagram showing a configuration of mobile station apparatus 10 according to the present embodiment.
- FIG. 7 is a block diagram showing a configuration of base station apparatus 20 according to the present embodiment. Note that the configurations of the mobile station apparatus 10 and the base station apparatus 20 shown in FIGS. 6 and 7 are simplified to explain the present invention, and the configurations of the normal base station apparatus and the mobile station apparatus are respectively It shall be provided.
- the transmission signals transmitted from the base station apparatus 20 are received by the antennas RX # 1 to RX # N and are transmitted to the transmission path by the duplexers 101 # 1 to 101 # N. After being electrically separated from the reception path, it is output to the RF reception circuits 102 # 1 to 102 # N.
- the RF receiving circuits 102 # 1 to 102 # N perform a frequency conversion process for converting a radio frequency signal into a baseband signal, and then a Fourier transform is performed by a fast Fourier transform unit (FFT unit) (not shown).
- FFT unit fast Fourier transform unit
- the time series signal is converted into a frequency domain signal.
- the received signal converted into the frequency domain signal is output to data channel signal demodulation section 103.
- the data channel signal demodulating unit 103 separates the received signal input from the FFT unit by, for example, a maximum likelihood detection (MLD) signal separation method.
- MLD maximum likelihood detection
- the channel estimation unit 104 estimates a channel state from the reference signal included in the reception signal output from the FFT unit, and notifies the data channel signal demodulation unit 103 and a channel information measurement unit 107 (to be described later) of the estimated channel state.
- Data channel signal demodulating section 103 separates the received signal by the above-described MLD signal separation method based on the notified channel state.
- the control channel signal demodulator 105 demodulates the control channel signal (PDCCH) output from the FFT unit. Then, the control information included in the control channel signal is notified to the data channel signal demodulation unit 103.
- Data channel signal demodulator 103 demodulates the extracted received signal for user k based on the notification content from control channel signal demodulator 105. Note that prior to the demodulation processing by the data channel signal demodulating unit 103, the extracted received signal regarding the user k is demapped by a subcarrier demapping unit (not shown) and returned to a time-series signal. .
- the received signal relating to user k demodulated by data channel signal demodulating section 103 is output to channel decoding section 106. Then, the channel decoding unit 106 performs channel decoding processing to reproduce the transmission signal #k.
- the transmission antennas of the base station apparatus 20 are multiplexed with SIB information and RRC signaling information as in the data transmission methods according to the second and third aspects described above, the transmission antennas of the base station apparatus 20 The number N TX is included in the reproduced transmission signal #k. For this reason, when the data transmission methods according to the second and third aspects are applied, the number of transmission antennas N TX of the base station apparatus 20 is output from the channel decoding unit 106 to the comparison unit 111 described later, for example. .
- the receiving system part including the control channel signal demodulating unit 105 constitutes a receiving means for receiving the number of transmitting antennas N TX of the base station apparatus 20.
- the channel information measurement unit 107 measures channel information from the channel state notified from the channel estimation unit 104. Specifically, the channel information measurement unit 107 measures CQI based on the channel state notified from the channel estimation unit 104, selects PMI and RI corresponding to the CQI, and uses them to select the feedback control signal generation unit 108. Notify
- the feedback control signal generation unit 108 generates a control signal (for example, PUCCH) that feeds back these to the base station apparatus 20 based on the notified PMI, CQI, and RI.
- the control signal generated by the feedback control signal generation unit 108 is output to the multiplexer (MUX) 109.
- MUX multiplexer
- Broadcast channel signal demodulation section 110 demodulates the broadcast channel signal (PBCH) output from the FFT section.
- PBCH broadcast channel signal
- the number of transmit antennas N TX of the base station apparatus 20 is multiplexed on the MIB information, number of transmission antennas N TX of the base station apparatus 20, broadcast channel Included in the signal.
- the number of transmission antennas N TX of the base station device 20 is output from the broadcast channel signal demodulation unit 110 to the comparison unit 111 described later.
- broadcast information other than the number of transmission antennas N TX of the base station apparatus 20 is output to an upper layer (not shown).
- the reception system part including the broadcast channel signal demodulation unit 110 constitutes reception means for receiving the number of transmission antennas N TX of the base station apparatus 20.
- the comparison unit 111 constitutes selection means, and is a channel decoding unit 106 (data transmission method according to the second and third modes) or a broadcast channel signal demodulation unit 110 (data transmission method according to the first mode).
- the number of transmission antennas N TX of the base station apparatus 20 notified from the base station apparatus 20 is compared with the maximum number of support antennas of the base station apparatus 20 supported by the mobile station apparatus 10. Note that the number of supported antennas of the base station apparatus 20 supported by the mobile station apparatus 10 is specified from UE capability indicating the performance information of the mobile station apparatus UE and the UE category. Then, the smaller number of antennas is selected as the number of pseudo antennas N min among the number of transmission antennas N TX and the maximum number of support antennas. Then, the selected number of pseudo antennas N min is output to the data channel signal generation unit 112.
- transmission data #k related to user #k transmitted from the upper layer is output to data channel signal generation section 112.
- the data channel signal generation unit 112 generates an RRC control signal (RRC message) including the number of pseudo antennas N min output from the comparison unit 111. Then, data channel signal #k including this RRC control signal and transmission data #k is generated and output to channel coding section 113.
- the data channel signal #k from the data channel signal generation unit 112 is subjected to channel coding by the channel coding unit 113 and then data modulated by the data modulation unit 114.
- Data channel signal #k data-modulated by data modulator 114 is inverse Fourier transformed by a discrete Fourier transform unit (not shown), converted from a time-series signal to a frequency domain signal, and output to subcarrier mapping unit 115. Is done.
- the subcarrier mapping unit 115 maps the data channel signal #k to the subcarrier according to the schedule information instructed from the base station apparatus 20. At this time, the subcarrier mapping unit 115 maps (multiplexes) the reference signal #k generated by a reference signal generation unit (not shown) to the subcarrier together with the data channel signal #k. Data channel signal #k mapped to subcarriers in this way is output to precoding multiplication section 116.
- Precoding multiplication section 116 shifts transmission data #k by phase and / or amplitude for each of reception antennas RX # 1 to RX # N based on the precoding weight corresponding to the PMI selected by channel information measurement section 107. .
- the data channel signal #k phase-shifted and / or amplitude-shifted by the precoding multiplier 116 is output to the multiplexer (MUX) 109.
- the phase and / or amplitude-shifted data channel signal #k and the control signal generated by the feedback control signal generator 108 are combined, and received by the receiving antennas RX # 1 to RX # N.
- the transmission signal is generated.
- the transmission signal generated by the multiplexer (MUX) 109 is subjected to inverse fast Fourier transform by an inverse fast Fourier transform unit (not shown) and converted from a frequency domain signal to a time domain signal, and then the RF transmission circuit 117 # 1. To 117 # N.
- the transmission system portion including the data channel signal generation unit 112 constitutes antenna information transmission means for transmitting the number of pseudo antennas to the base station apparatus 20.
- the smaller number of transmission antennas N TX of base station apparatus 20 and the maximum number of support antennas of base station apparatus 20 supported by mobile station apparatus 10 is smaller. select the number of antennas as a pseudo antenna number N min, the pseudo-number of antennas N min since it was set to be transmitted to the base station apparatus 20 by the RRC control signal (RRC message), the number of transmission antennas N TX of the base station device 20 And the number of pseudo antennas N min that can increase the data rate most effectively between the mobile station apparatus 10 and the number of support antennas of the mobile station apparatus 10 can be notified to the base station apparatus.
- RRC control signal RRC message
- the base station apparatus transmits a data channel signal according to the number of pseudo antennas N min , so that the number of transmission antennas N TX of the base station apparatus 20 and the number of support antennas of the mobile station apparatus 10 are reduced. Since data transmission can be performed with the number of pseudo antennas N min that can increase the data rate most effectively, the number of transmission antennas N TX of the base station device 20 is supported by the base station device 20 supported by the mobile station device 10. Even when the number is different from the number of antennas, the data rate at the time of MIMO transmission can be increased to the maximum.
- the scheduler 201 determines the number of users to be multiplexed (the number of multiplexed users) based on channel estimation values given from channel estimation units 213 # 1 to 213 # k described later. Then, uplink / downlink resource allocation contents (scheduling information) for each user are determined, and transmission data # 1 to #k for users # 1 to #k are transmitted to corresponding channel coding sections 202 # 1 to 202 # k. .
- transmission data # 1 to SIB information including SIB information and RRC signaling information in which the number of transmission antennas N TX included in the base station apparatus 20 is multiplexed. #K is generated. Then, these transmission data # 1 to #k are transmitted to corresponding channel coding sections 202 # 1 to 202 # k.
- Antenna information transmission for transmitting the number of transmission antennas N TX to mobile station apparatus 10 by a transmission system part including a transmission data generation unit (not shown) that generates transmission data # 1 to #k including SIB information and RRC signaling information Means are configured.
- Transmission data # 1 to #k are channel-encoded by channel encoders 202 # 1 to 202 # k, and then output to data modulators 203 # 1 to 203 # k for data modulation. At this time, channel coding and data modulation are performed based on channel coding rates and modulation schemes provided from channel information reproducing units 216 # 1 to 216 # k described later. Transmission data # 1 to #k data-modulated by data modulators 203 # 1 to 203 # k are subjected to inverse Fourier transform by a discrete Fourier transform unit (not shown), and converted from a time-series signal to a frequency domain signal. It is output to the subcarrier mapping unit 204.
- Reference signal generators 205 # 1 to 205 # k generate individual reference signals (UE-specific RS) # 1 to #k for data channel demodulation for users # 1 to #k. Individual reference signals # 1 to #k generated by reference signal generation sections 205 # 1 to 205 # k are output to subcarrier mapping section 204.
- UE-specific RS individual reference signals
- transmission data # 1 to #k from data modulation sections 203 # 1 to 203 # k and individual reference signals # 1 to #k from reference signal generation sections 205 # 1 to 205 # k are mapped to subcarriers according to the schedule information given from the scheduler 201. Transmission data # 1 to #k mapped to subcarriers in this way are output to precoding multiplication sections 206 # 1 to 206 # k.
- Precoding multiplication sections 206 # 1 to 206 # k phase transmission data # 1 to #k for each of antennas TX # 1 to TX # N based on a precoding weight given from precoding weight generation section 218 described later. And / or amplitude shift (weighting of antennas TX # 1- # N by precoding). Transmission data # 1 to #k whose phases and / or amplitudes are shifted by precoding multipliers 206 # 1 to 206 # k are output to multiplexer (MUX) 207.
- MUX multiplexer
- Control signal generators 208 # 1 to 208 # k generate control signals (PDCCH) # 1 to #k based on the number of multiplexed users from the scheduler 201.
- PDCCH # 1 to #k generated by control signal generation sections 208 # 1 to 208 #k are output to multiplexer (MUX) 207.
- MUX multiplexer
- the broadcast information generation unit 219 generates broadcast information (broadcast channel signal) to be broadcast to the mobile station device 10.
- the notification information generated by the notification information generation unit 219 is output to the multiplexer (MUX) 207.
- MUX multiplexer
- broadcast information (broadcast channel signal) including MIB information in which the number of transmission antennas N TX included in the base station device 20 is multiplexed is generated.
- the transmission system part including the broadcast information generation unit 219 constitutes antenna information transmission means for transmitting the number of transmission antennas N TX to the mobile station apparatus 10.
- the multiplexer (MUX) 207 combines the transmission data # 1 to #k shifted in phase and / or amplitude and the PDCCHs # 1 to #k generated by the control signal generators 208 # 1 to 208 # k. Then, a transmission signal is generated for each of the transmission antennas TX # 1 to TX # N.
- the transmission signal generated by the multiplexer (MUX) 207 is subjected to inverse fast Fourier transform by an unillustrated inverse fast Fourier transform unit and converted from a frequency domain signal to a time domain signal, and then the RF transmission circuit 209 # 1. To 209 # N.
- the transmission antennas TX # 1 to TX # are transmitted via the duplexers 210 # 1 to 210 # N.
- N is transmitted to the mobile station apparatus 10 via the downlink from the antennas TX # 1 to #N.
- the RF transmission circuit 209, the duplexer 210, and the transmission system part including the transmission antenna TX constitute data transmission means for transmitting a data channel signal to the mobile station apparatus 10.
- transmission signals transmitted from the mobile station apparatus 10 in the uplink are received by the antennas TX # 1 to #N, and are electrically transmitted to the transmission path and the reception path by the duplexers 210 # 1 to 210 # N.
- the RF receiving circuits 211 # 1 to 211 # N are subjected to frequency conversion processing for converting a radio frequency signal into a baseband signal, and then subjected to Fourier transform in a fast Fourier transform unit (FFT unit) (not shown).
- FFT unit fast Fourier transform unit
- the time series signal is converted into a frequency domain signal.
- the received signals converted into these frequency domain signals are output to data channel signal demultiplexing sections 212 # 1 to 212 # k.
- the data channel signal demultiplexing units 212 # 1 to 212 # k demultiplex the received signals input from the FFT unit by, for example, a maximum likelihood detection (MLD) signal demultiplexing method.
- MLD maximum likelihood detection
- Channel estimation sections 213 # 1 to 213 # k estimate the channel state from the reference signal included in the received signal output from the FFT section, and determine the estimated channel state as data channel signal separation sections 212 # 1 to 212 # k and Notify control channel signal demodulation sections 214 # 1 to 214 # k.
- Data channel signal separation sections 212 # 1 to 212 # k separate received signals by the MLD signal separation method described above based on the notified channel state.
- Received signals related to user # 1 to user #k separated by data channel signal demultiplexing sections 212 # 1 to 212 # k are demapped by a subcarrier demapping section (not shown) and returned to a time-series signal. Thereafter, the data is demodulated by a data demodulator (not shown). Then, channel decoding processing is performed by channel decoding sections 215 # 1 to 215 # k, whereby transmission signals # 1 to #k are reproduced. Note that the reproduced transmission signals # 1 to #k include the number of pseudo antennas N min in the RRC message.
- the number of pseudo antennas N min is output from, for example, channel decoding units 215 # 1 to 215 # k to pseudo antenna number accumulating units 217 # 1 to 217 # k described later.
- the receiving section that includes the data channel signal demultiplexing unit 212 that demultiplexes the transmission signals # 1 to #k including the RRC message constitutes a receiving unit that receives the number of pseudo antennas N min from the mobile station apparatus 10.
- Control channel signal demodulation sections 214 # 1 to 214 # k demodulate control channel signals (for example, PDCCH) included in the received signal input from the FFT section. At this time, control channel signal demodulation sections 214 # 1 to 214 # k demodulate control channel signals corresponding to users # 1 to #k, respectively. At this time, control channel signal demodulation sections 214 # 1 to 214 # k demodulate the control channel signal based on the channel state notified from channel estimation sections 213 # 1 to 213 # k. The control channel signals demodulated by control channel signal demodulation sections 214 # 1 to 214 # k are output to channel information reproduction sections 216 # 1 to 216 # k.
- control channel signal demodulation sections 214 # 1 to 214 # k demodulate control channel signals (for example, PDCCH) included in the received signal input from the FFT section. At this time, control channel signal demodulation sections 214 # 1 to 214 # k demodulate control channel signals corresponding to users # 1
- Channel information reproducing sections 216 # 1 to 216 # k receive information about channels (channel information) from information included in each control channel signal (for example, PUCCH) input from control channel signal demodulation sections 214 # 1 to 214 # k. Play.
- the channel information includes, for example, feedback information such as CQI, PMI, and RI notified on the PDCCH.
- the CQIs reproduced by the channel information reproducing units 216 # 1 to 216 # k are output to the data modulating units 203 # 1 to 203 # k and the channel encoding units 202 # 1 to 202 # k, respectively.
- the PMI and RI reproduced by the channel information reproducing units 216 # 1 to 216 # k are output to the precoding weight generating unit 218.
- the pseudo antenna number accumulating units 217 # 1 to 217 # k accumulate the pseudo antenna number N min notified from the channel decoding units 215 # 1 to 215 # k.
- the number of pseudo antennas N min applied to the mobile station apparatuses 10 # 1 to 10 # k is stored in the number of pseudo antennas accumulating units 217 # 1 to 217 # k, respectively.
- the number of pseudo antennas N min accumulated in the number of pseudo antennas accumulating units 217 # 1 to 217 # k is output to the precoding weight generating unit 218 as appropriate.
- Precoding weight generation section 218 includes PMI and RI input from channel information reproduction sections 216 # 1 to 216 # k, and the number of pseudo antennas N min input from pseudo antenna number storage sections 217 # 1 to 217 # k. Based on the above, a precoding weight indicating the phase and / or amplitude shift amount for the transmission data # 1 to #k is generated. Each generated precoding weight is output to precoding multipliers 206 # 1 to 206 # k, and is used for precoding transmission data # 1 to transmission data #k.
- the precoding weight based on the number of pseudo antennas N min input from the number of pseudo antennas accumulating units 217 # 1 to 217 # k the number of transmission antennas N TX included in the base station apparatus 20 can be increased. Instead, a precoding weight suitable for the number of pseudo antennas N min is generated. For example, even when the number of transmission antennas N TX included in the base station apparatus 20 is 8 antennas, if the number of pseudo antennas N min for the mobile station apparatus 10 to be communicated is 4 antennas, 8 antennas are virtually Data transmission can be performed as four antennas (specifically, two antennas are virtually set as one antenna).
- the smaller of the transmission antenna number N TX of the base station apparatus 20 and the maximum number of support antennas of the base station apparatus 20 supported by the mobile station apparatus 10 is smaller.
- a data channel signal is transmitted in accordance with the number of pseudo antennas N min composed of the number of antennas.
- data transmission can be performed with the number of pseudo antennas N min that can increase the data rate most effectively between the number of transmission antennas N TX of the base station device 20 and the number of support antennas of the mobile station device 10.
- the number of transmission antennas N TX of the base station apparatus 20 is different from the number of antennas of the base station apparatus 20 supported by the mobile station apparatus 10, it is possible to maximize the data rate during MIMO transmission.
- the number of transmission antennas N TX of base station apparatus 20 and the maximum number of support antennas of base station apparatus 20 supported by mobile station apparatus 10 are small. square number of antennas is selected as a pseudo-antenna number N min, the data channel signal is transmitted in response to the pseudo-antenna number N min. Thereby, data transmission can be performed with the number of pseudo antennas N min that can increase the data rate most effectively between the number of transmission antennas N TX of the base station device 20 and the number of support antennas of the mobile station device 10. Even when the number of transmitting antennas N TX of the base station apparatus 20 is different from the number of supporting antennas of the base station apparatus 20 supported by the mobile station apparatus 10, it is possible to maximize the data rate during MIMO transmission.
- the number of transmission antennas N TX of base station apparatus 20 is notified, and the number of pseudo antennas N min is selected based on the number of transmission antennas N TX. It is possible to avoid a situation in which the number of transmission antennas N TX of the station apparatus 20 cannot be properly grasped and subsequent data communication becomes impossible.
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Abstract
Description
Claims (10)
- 基地局装置の送信アンテナ数を移動局装置に通知するステップと、移動局装置にて前記送信アンテナ数と当該移動局装置がサポートする基地局装置の最多のサポートアンテナ数とを比較して少ない方のアンテナ数を疑似アンテナ数として選択するステップと、前記疑似アンテナ数を基地局装置に通知するステップと、前記疑似アンテナ数に応じて基地局装置からデータチャネル信号を送信するステップとを具備することを特徴とするデータ送信方法。
- 前記送信アンテナ数をMIB(Master Information Block)情報に多重して移動局装置に送信する一方、前記疑似アンテナ数をRRCメッセージにより基地局装置に通知することを特徴とする請求項1記載のデータ送信方法。
- 前記送信アンテナ数をSIB(System Information Block)情報に多重して移動局装置に送信する一方、前記疑似アンテナ数をRRCメッセージにより基地局装置に通知することを特徴とする請求項1記載のデータ送信方法。
- 前記送信アンテナ数をRRCシグナリング情報に多重して移動局装置に送信する一方、前記疑似アンテナ数をRRCメッセージにより基地局装置に通知することを特徴とする請求項1記載のデータ送信方法。
- 前記送信アンテナ数をRRCシグナリング情報に含まれるCSI-RSのアンテナポート数情報に多重して移動局装置に送信することを特徴とする請求項4記載のデータ送信方法。
- 前記送信アンテナ数を移動局装置で保持される性能情報に含まれる前記サポートアンテナ数と比較して前記疑似アンテナ数を選択することを特徴とする請求項1記載のデータ送信方法。
- 基地局装置が前記疑似アンテナ数に応じてデータチャネル信号を送信するまで共通パイロットチャネル信号を用いた送信ダイバーシチを利用してデータチャネル信号を送信することを特徴とする請求項1記載のデータ送信方法。
- 前記送信アンテナ数が8アンテナであることを特徴とする請求項1記載のデータ送信方法。
- 自装置が備える送信アンテナ数を移動局装置に送信するアンテナ情報送信手段と、前記送信アンテナ数と移動局装置がサポートする基地局装置の最多のサポートアンテナ数のうち、少ない方のアンテナ数で構成される疑似アンテナ数を移動局装置から受信する受信手段と、前記疑似アンテナ数に応じてデータチャネル信号を移動局装置に送信するデータ送信手段とを具備することを特徴とする基地局装置。
- 基地局装置の送信アンテナ数を受信する受信手段と、前記送信アンテナ数と自装置がサポートする基地局装置の最多のサポートアンテナ数とを比較して少ない方のアンテナ数を疑似アンテナ数として選択する選択手段と、前記疑似アンテナ数を基地局装置に送信するアンテナ情報送信手段とを具備することを特徴とする移動局装置。
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US13/643,473 US8848647B2 (en) | 2010-04-30 | 2011-04-21 | Data transmitting method, base station apparatus and mobile station apparatus |
CN201180021698XA CN102870448A (zh) | 2010-04-30 | 2011-04-21 | 数据发送方法、基站装置以及移动台装置 |
EP11774896A EP2566215A1 (en) | 2010-04-30 | 2011-04-21 | Data transmission method, base station device, and mobile station device |
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Cited By (3)
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WO2013107256A1 (zh) * | 2012-01-21 | 2013-07-25 | 中兴通讯股份有限公司 | 下行控制信息的发送方法、检测方法、基站和用户设备 |
WO2016074132A1 (zh) * | 2014-11-10 | 2016-05-19 | 华为技术有限公司 | 信息传输方法、设备和系统 |
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JP2013118567A (ja) * | 2011-12-05 | 2013-06-13 | Ntt Docomo Inc | 無線基地局装置、無線通信システム及び無線通信方法 |
CN104106223A (zh) * | 2012-02-11 | 2014-10-15 | Lg电子株式会社 | 报告信道状态信息的方法、其支持方法及所述方法的设备 |
JP6374510B2 (ja) * | 2013-09-11 | 2018-08-15 | 華為技術有限公司Huawei Technologies Co.,Ltd. | チャネル状態情報参照信号を構成するための方法、および基地局 |
WO2016013351A1 (ja) * | 2014-07-25 | 2016-01-28 | 株式会社Nttドコモ | 基地局、ユーザ装置および無線通信ネットワーク |
US20180083681A1 (en) * | 2015-01-30 | 2018-03-22 | Telefonaktiebolaget Lm Ericsson (Publ) | A CSI Report Framework for Enhanced Separate Dimension Feedback |
JP6925979B2 (ja) * | 2015-07-27 | 2021-08-25 | アップル インコーポレイテッドApple Inc. | セルラーIoTのためのナローバンドLTEのためのシステム動作のシステムおよび方法 |
US11533099B2 (en) | 2016-08-11 | 2022-12-20 | Ntt Docomo, Inc. | Method of selecting reception resource and method of CSI-RS transmission |
CN108023717B (zh) * | 2016-11-04 | 2021-08-20 | 华为技术有限公司 | 一种参考信号的测量方法和装置 |
CN110740479B (zh) * | 2018-07-20 | 2021-06-08 | 维沃移动通信有限公司 | 一种用于监听pdcch的方法、终端及网络设备 |
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EP2566215A1 (en) | 2013-03-06 |
JP2011234299A (ja) | 2011-11-17 |
US20130058279A1 (en) | 2013-03-07 |
JP5291664B2 (ja) | 2013-09-18 |
CN102870448A (zh) | 2013-01-09 |
US8848647B2 (en) | 2014-09-30 |
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