KR20130081138A - Method and device for crs-based cooperative communication system - Google Patents
Method and device for crs-based cooperative communication system Download PDFInfo
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- KR20130081138A KR20130081138A KR1020120002144A KR20120002144A KR20130081138A KR 20130081138 A KR20130081138 A KR 20130081138A KR 1020120002144 A KR1020120002144 A KR 1020120002144A KR 20120002144 A KR20120002144 A KR 20120002144A KR 20130081138 A KR20130081138 A KR 20130081138A
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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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
- 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
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
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Abstract
Description
The present invention relates to a method and apparatus for generating a feedback signal and a downlink control channel in a cellular mobile communication system in which a plurality of base stations exist. Particularly, the present invention relates to a cooperative system in which several base stations cooperate to support downlink transmission of a terminal. The present invention relates to a method and apparatus for efficiently transmitting and receiving feedback in a cooperative multi-point (CoMP).
The mobile communication system has evolved into a high-speed and high-quality wireless packet data communication system for providing data service and multimedia service apart from providing initial voice-oriented service. Recent 3GPP high speed downlink packet access (HSDPA), high speed uplink packet access (HSUPA), long term evolution (LTE), long term evolution advanced (LTE-A), high rate packet data (HRPD) of 3GPP2, and IEEE Various mobile communication standards such as 802.16 were developed to support high speed, high quality wireless packet data transmission services.
The LTE system was developed to efficiently support high-speed wireless packet data transmission. The LTE system can maximize radio system capacity by utilizing various radio access technologies. The LTE-A system is an advanced wireless system of the LTE system and has improved data transmission capability compared to LTE.
Existing third generation wireless packet data communication systems such as HSDPA, HSUPA, and HRPD use techniques such as adaptive modulation and coding (AMC) and channel sensitive scheduling to improve transmission efficiency. In this case, the AMC method and the channel sensitive scheduling method may apply appropriate modulation and coding schemes at a time point determined to be the most efficient by receiving partial channel state information from the receiver.
In the wireless packet data communication system to which the AMC method is applied, the transmitter may adjust the amount of data to be transmitted according to channel conditions. In other words, if the channel condition is bad, the transmitter may reduce the amount of data to be transmitted to match a reception error probability to a desired level. If the channel condition is good, the transmitter can increase the amount of data to be transmitted so that the reception error probability can be effectively transmitted while keeping the reception error probability to a desired level.
In the wireless packet data communication system to which the channel sensitive scheduling resource management method is applied, the transmitter selectively services a user having a good channel condition among multiple users, thereby increasing system capacity compared to allocating and serving a channel to one user. This increase in capacity is called the multi-user diversity gain. The AMC method may also include a function of determining the number or rank of spatial layers of a signal to be transmitted when used with a multiple input multiple output (MIMO) transmission scheme. In this case, the wireless packet data communication system to which the AMC method is applied determines not only the code rate and the modulation scheme but also how many layers are transmitted using MIMO to determine the optimal data rate. .
It is generally known that the capacity increase can be expected in the OFDMA system as compared with the CDMA system. One of various causes of capacity increase in the OFDMA scheme is that frequency domain scheduling can be performed. As the channel gains the capacity gain by the channel adaptive scheduling method according to the time varying characteristic, the channel gain the capacity gain by using different characteristics according to the frequency. In recent years, studies have been actively conducted to convert CDMA (code division multiple access), which is used in second and third generation mobile communication systems, to orthogonal frequency division multiple access (OFDMA) in a next generation system. And 3GPP and 3GPP2 have begun standardizing on evolutionary systems using OFDMA.
1 is a diagram illustrating a cellular mobile communication system in which a transmit / receive antenna is disposed at the center of each cell according to the prior art.
Referring to FIG. 1, in a cellular mobile communication system composed of a plurality of cells, a user equipment (UE) uses a mobile communication service using the aforementioned methods from a single cell selected for a long period of time (semi-static). It is provided. For example, assume that a cellular mobile communication system consists of three cells,
The
When the mobile communication service is independently provided in
2 is a view showing the position of the CRS transmitted from the base station to the terminal in the LTE-A system according to the prior art.
Referring to FIG. 2, a signal for a CRS antenna port may be transmitted for each location. That is, the base station transmits a CRS for downlink measurement to the terminal at the
In the cellular mobile communication system illustrated in FIG. 1, there is a limit in that a terminal existing at the edge of a cell is supported by a high data rate due to a large interference from another cell. That is, in the cellular mobile communication system as shown in FIG. 1, the high data rate provided to terminals existing in a cell is greatly influenced by the location of the terminal in the cell. Therefore, the conventional cellular mobile communication system can transmit and receive at a high data rate in the case of a terminal located relatively close to the center of the cell, but there is a problem that it can not do so in the case of a terminal located relatively far away.
Accordingly, an object of the present invention is to establish a simple cooperative multi-point (CoMP) scheme based on the LTE-A system, and at this time, a method of transmitting feedback signals and downlink control information for effectively operating the constructed cooperative transmission. And related devices.
In order to achieve the above technical problem, the control information transmission method of the base station in the cooperative multi-point system according to an embodiment of the present invention, information on the cell-based reference signal (Cell-specific Reference Signal) resources Transmitting cooperative multi-point set information to the terminal; Receiving feedback information from the terminal; Determining whether the base station performs cooperative transmission using a joint transmission method based on the received feedback information; If it is determined that the cooperative transmission using the joint transmission method (Joint Transmission) is performed, downlink including individual precoding information for each of the cooperative transmission cells or combined precoding information in which all of the cooperative transmission cells are combined. Generating control information; And transmitting the downlink control information to the terminal.
In a cooperative multi-point system according to another embodiment of the present invention, an apparatus for transmitting control information of a base station includes: a communication unit configured to transmit and receive data to and from the outside; And cooperative multi-point set information including information on a cell-specific reference signal resource to the terminal through the communication unit, and feedback information from the terminal through the communication unit. When the base station performs cooperative transmission using a joint transmission method (Joint Transmission), it is determined whether to transmit individual precoding information for each of the cooperatively transmitted cells based on the received feedback information. If it is determined that the individual precoding information is to be transmitted, downlink control information including the individual precoding information and phase difference information of the cooperatively transmitted cells is generated, and the downlink control information is transmitted through the communication unit. It characterized in that it comprises a control unit for controlling to transmit to the terminal.
In a cooperative transmission system according to another embodiment of the present invention, a method for transmitting feedback information of a terminal includes: receiving cooperative transmission set information including a cell-based reference signal from a base station; Determining whether a feedback mode is a feedback mode for performing cooperative transmission using a simultaneous transmission method based on the cooperative transmission set information; When in a feedback mode for performing cooperative transmission using a simultaneous transmission method, generating feedback information including combined precoding information in which all cooperatively transmitted cells are combined; And transmitting the feedback information to the base station.
In the cooperative transmission system according to another embodiment of the present invention, the apparatus for transmitting feedback information of a terminal includes a communication unit configured to transmit and receive data with the outside; And receiving cooperative transmission set information including a cell-based reference signal from a base station through the communication unit, and determining whether a feedback mode is a feedback mode for performing cooperative transmission using a simultaneous transmission method based on the cooperative transmission set information. In case of a feedback mode for performing cooperative transmission using a simultaneous transmission method, the feedback information including combined precoding information in which all cooperatively transmitted cells are combined is generated, and the feedback information is transmitted to the base station through the communication unit. It characterized in that it comprises a control unit for controlling to transmit.
According to the present invention, in a cellular mobile communication system, adjacent cells may transmit data in cooperation with each other through cooperative multi-point (CoMP) for a terminal located at a cell edge. In addition, in a cellular mobile communication system, cells may provide improved mobile communication services as compared to a case where there is no cooperation. When the terminal is located at the cell edge, the transmission cell is determined dynamically to transmit data to the terminal. In addition, by transmitting information at the same time to the terminal at the edge of the cell can increase the information reception rate of the terminal. Through this, all terminals in the cellular mobile communication system can obtain a high data rate evenly regardless of their location in the cell.
1 is a diagram illustrating a cellular mobile communication system in which a transmit / receive antenna is disposed at a center for each cell according to the prior art.
2 is a view showing the position of the CRS transmitted from the base station to the terminal in the LTE-A system according to the prior art.
3 illustrates the structure of a cellular mobile communication system in accordance with an embodiment of the present invention.
4 is a diagram illustrating the location of a CRS transmitted by a base station to a terminal according to an embodiment of the present invention.
5 is a view for explaining the operation of the terminal in a cellular mobile communication system supporting CoMP transmission according to an embodiment of the present invention.
6 is a diagram illustrating a base station operation in case of performing CoMP JT transmission by transmitting respective TPMI information for each cell to a terminal in a cellular mobile communication system supporting CoMP transmission according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating a base station operation in case of performing CoMP JT transmission by transmitting one combined TPMI information to a UE in a cellular mobile communication system supporting CoMP transmission according to another embodiment of the present invention.
8 is a diagram illustrating a base station operation in case of transmitting CoMP JT by transmitting TPMI information to a terminal in a cellular mobile communication system supporting CoMP transmission according to another embodiment of the present invention.
9 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
10 is a diagram showing a configuration of a central control apparatus according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.
While the embodiments of the present invention will be described in detail, the OFDM-based wireless communication system, particularly the 3GPP EUTRA standard, will be the main object of the present invention, but the main point of the present invention is to provide a communication system It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
A cellular mobile communication system is achieved by building a plurality of cells in a limited area. In each cell, a base station equipment dedicated to mobile communication in a corresponding cell provides mobile communication services to terminals in the cell. At this time, the specific terminal is supported by the mobile communication service only from one cell determined semi-statically. This system is referred to as a non-cooperative multi-point (CoMP) system.
In a non-CoMP system, the high data rate provided to all terminals existing in a cell varies greatly depending on where the terminal is located in the cell. That is, although a terminal located at the center of a cell can receive a high data rate, a terminal located relatively close to a cell edge can not receive a high data rate.
A contrasting system is the Cooperative Multi-point (CoMP) system. The CoMP system is a system in which a plurality of cells transmit data in cooperation with each other to support a terminal located at a cell edge. In this case, an improved mobile communication service may be provided in preparation for the non-CoMP system. The present invention proposes a method and apparatus for generating a feedback signal and a downlink control channel in consideration of a dynamic cell selection (DS) scheme and a joint transmission (JT) scheme among CoMP systems. In this case, the DS scheme refers to a scheme in which the UE selects a cell having an optimal channel by measuring channel conditions for each cell. In addition, the JT scheme refers to a method of simultaneously transmitting data to a specific terminal in multiple cells. In addition, the present invention can solve the above problems by improving the control channel to efficiently apply the DS or JT scheme to the LTE-A system.
3 is a diagram illustrating a structure of a cellular mobile communication system according to an embodiment of the present invention.
In FIG. 3, it is assumed that the cellular mobile communication system is composed of three cells. In addition, the cell used in the embodiment of the present invention means a data transmission area that can be serviced by a specific transmission point, each transmission point has a common RRH (macro base station and cell-ID) in the macro area (macro area) It may be a remote radio head or a macro or pico cell in which each transmission point has a different cell-ID.
The central control unit refers to a device that can transmit / receive data to / from the terminal and process the transmitted / received data. Here, the macro base station may be referred to as a central control unit when each transmission point is an RRH having a common macro base station and a cell-ID. In addition, when each transmission point is a macro or pico cell having a different cell-ID, a device that integrates and manages each cell may be referred to as a central control device.
Referring to FIG. 3, the cellular mobile communication system transmits CoMP from at least one
4 is a diagram illustrating the location of a CRS resource transmitted by a base station to a terminal according to an embodiment of the present invention.
Referring to FIG. 4, the
5 is a diagram illustrating an operation of a terminal in a cellular mobile communication system supporting CoMP transmission according to an embodiment of the present invention.
More specifically, FIG. 5 illustrates a combined channel for transmission of CoMP JT scheme using one combined precoding matrix indicator (PMI) for channel information from multiple cells in a cellular mobile communication system according to an embodiment of the present invention. A diagram for describing an operation of a terminal when generating information. Here, when channel information from multiple cells is combined to generate combined channel information using one PMI, this PMI is called an aggregated PMI. For example, if there are two CRS antenna ports in the
5, the terminal checks the CoMP set information received from the base station in
Thereafter, the terminal proceeds to step 510 to check the feedback mode and timing for the CRS of the CoMP set, and proceeds to step 520 determines whether the feedback mode is a feedback mode for CoMP JT.
If it is determined in
At this time, W1 is PMI information about a channel in
At this time, W is combined PMI information for the combined channel from
In Equation 3, N_CoMP is the number of cells participating in CoMP JT transmission, and in the embodiment, the number of cells participating in CoMP JT transmission is two. If the number of antenna ports is different for each cell participating in CoMP JT transmission, when extracting the PMI applied to each cell from the combined PMI information, the Frobenius Norm of the applied PMIs for each cell may have a value of 1 for each cell. Feedback information may be generated by applying scaling factors to the applied PMI. According to an embodiment of the present invention, in the case of three base stations performing CoMP JT transmission, two antenna ports in base station 1 and two base stations, and four antenna ports in base station 3, a codebook of eight CRS antenna ports Any combined PMI can be selected at. In this case, when generating the channel quality information (CQI), feedback information may be generated by applying scaling factors so that Frobenius Norm has a value of 1 in the PMI applied to each cell in each base station.
In
FIG. 6 illustrates an operation of a base station in case of transmitting CoMP JT by transmitting respective transmitted precoding matrix indicator (TPMI) information for each cell in a cellular mobile communication system supporting CoMP transmission according to an embodiment of the present invention. It is a figure for demonstrating. Here, the JT method refers to a method in which the UE simultaneously receives data through multiple cells.
Referring to FIG. 6, in
In
Thereafter, the base station proceeds to step 660 and generates a PDCCH or ePDCCH including the downlink control information generated in
A new field for CoMP transmission can be defined in DCI. The new field for this CoMP transmission is called "DCI field X". In this embodiment, an example is shown when DCI field X is 2 bits. When DCI filed X is '01', CoMP transmission is referred to as cell A in the present embodiment, such as cell information (Cell ID, CRS port number, Scrambling Initialization State during PDSCH transmission, etc.) corresponding to '01' in the DS method. And may correspond to cell 310). The cell information may be informed when the base station transmits CoMP set information to the UE, and in the DCI field X, it may serve to map cell information used in generating a downlink control channel and cell information in the CoMP set. .
Precoding information included in the downlink control information includes information such as precoding information and the number of layers when data is transmitted from the base station of cell A. When DCI filed X is '10', CoMP transmission is referred to as cell B in the present embodiment, such as cell information (Cell ID, CRS port number, Scrambling Initialization State during PDSCH transmission, etc.) corresponding to '10' in the DS method. And may correspond to cell 320). The cell information may be informed when the base station transmits CoMP set information to the user equipment. In the DCI field X, the cell information may serve to map cell information used in generating a downlink control channel with cell information in the CoMP set.
The precoding information included in the downlink control information includes information such as precoding information and the number of layers when data is transmitted from the base station of the cell B. CoMP transmission when the DCI field X is '11' is a case where a JT transmission method for simultaneously transmitting data to UEs in
The precoding information included in the downlink control information includes information such as precoding information and the number of layers when data is transmitted from the base stations of each cell A and cell B. In addition, the downlink control information may include phase difference information for use in cooperative transmission between pre-cell intercoding. This phase difference information may indicate one of the M-ary PSK signals in M bits. For example, the phase difference information may be 2 bits and this information may indicate one of (0 °, 90 °, 180 °, 270 °). In base stations A and B, CoMP JT transmission is performed by precoding data using phase difference information that can be used for cooperative transmission between precoding information in each cell and inter-cell precoding.
FIG. 7 is a diagram illustrating an operation of a base station when CoMP JT transmission is performed by transmitting one combined TPMI information for cells to a UE in a cellular mobile communication system supporting CoMP transmission according to another embodiment of the present invention. to be. Here, the JT method refers to a method in which the UE simultaneously receives data through several cells.
Referring to FIG. 7, in
In
Thereafter, the base station proceeds to step 760 and generates a PDCCH or ePDCCH including the downlink control information generated in
A new field for CoMP transmission can be defined in DCI. The new field for this CoMP transmission is called "DCI field X". In this embodiment, an example is shown when DCI field X is 2 bits. When DCI filed X is '01' and DCI filed X is '10', CoMP transmission can be supported in the same manner as in <Table 1>. CoMP transmission when the DCI field X is '11' is a case where the JT transmission method simultaneously transmits data to the UE in
The precoding information included in the downlink control information includes information such as the combined precoding information and the number of layers when data is transmitted from the base stations of the cell A and the cell B. When precoding is performed in each base station using the combined precoding information at this time, a scaling factor may be applied to the precoding information to be precoded. For example, when there are two CRS antenna ports in each of the
FIG. 8 is a diagram for describing an operation of a base station when CoMP JT transmission is performed by transmitting TPMI information to a UE in a cellular mobile communication system supporting CoMP transmission according to another embodiment of the present invention.
In the embodiment according to FIG. 8, the embodiment shown in FIGS. 6 and 7 may be simultaneously performed.
Referring to FIG. 8, in
In
In
If it is determined in
If it is determined in
Thereafter, the base station generates a PDCCH or ePDCCH including the downlink control information generated in
9 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
Referring to FIG. 9, the terminal 900 includes a
The
The
The channel estimator 930 determines necessary feedback information for each CRS based on CoMP set related information and feedback mode received from the central control apparatus, and estimates a channel using the received CRS. The channel estimator 930 controls the
9, although the
Although the terminal 900 has been described as being composed of a
10 is a diagram illustrating a configuration of a central control apparatus according to an embodiment of the present invention.
Referring to FIG. 10, the
The
When the
The
The embodiments of the present invention disclosed in the present specification and drawings are merely illustrative of specific embodiments of the present invention and are not intended to limit the scope of the present invention in order to facilitate understanding of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.
900: terminal
910: communication unit
920: control unit
930: channel estimator
1000: base station
1010: control unit
1020: communication unit
1030: precoding information allocation unit
Claims (16)
Transmitting cooperative multi-point set information including information on cell-specific reference signal resources to the terminal;
Receiving feedback information from the terminal;
Determining whether the base station performs cooperative transmission using a joint transmission method based on the received feedback information;
If it is determined that the cooperative transmission using the joint transmission method (Joint Transmission) is performed, downlink including individual precoding information for each of the cooperative transmission cells or combined precoding information in which all of the cooperative transmission cells are combined. Generating control information; And
And transmitting the downlink control information to the terminal.
Generating the downlink control information,
And determining whether to transmit the individual precoding information for each of the cooperatively transmitting cells.
Generating the downlink control information,
If it is determined that the individual precoding information is to be transmitted, generating downlink control information including the individual precoding information and phase difference information of the cooperatively transmitting cells; and
If it is determined that the individual precoding information is not transmitted, generating the precoding information.
Generating the downlink control information,
If it is determined that the individual precoding information is not transmitted, downlink control information including a scaling factor for compensating the combined precoding information is maximized so that transmission power of the cooperatively transmitting cells is maximized. And generating control information.
The scaling factor is
And at least one of the number of the cooperatively transmitting cells or the number of antennas of each of the cooperatively transmitting cells.
Communication unit for transmitting and receiving data with the outside; And
Cooperative multi-point set information including information on a cell-specific reference signal resource is transmitted to the terminal through the communication unit, and feedback information is received from the terminal through the communication unit. Receiving and determining whether the base station performs cooperative transmission using a joint transmission method based on the received feedback information, and performs cooperative transmission using the joint transmission method. If it is determined to generate the downlink control information including the individual precoding information for each of the cooperative transmission cells or the combined precoding information combined all the cooperative transmission cells, and transmits the downlink control information to the terminal Control information transmission chapter comprising a control unit for controlling to .
The control unit,
When generating the downlink control information,
And determining whether to transmit the individual precoding information for each of the cooperatively transmitting cells.
The control unit,
When generating the downlink control information,
If it is determined that the individual precoding information is transmitted, it is determined that downlink control information including the individual precoding information and phase difference information of the cooperatively transmitted cells is not generated and the individual precoding information is not transmitted. The control information transmission device, characterized in that for generating the precoding information.
The control unit,
When generating the downlink control information,
If it is determined that the individual precoding information is not transmitted, downlink control information including a scaling factor for compensating the combined precoding information is maximized so that transmission power of the cooperatively transmitting cells is maximized. Control information transmission device, characterized in that for generating.
The scaling factor is
And at least one of the number of the cooperatively transmitting cells or the number of antennas of each of the cooperatively transmitting cells.
Receiving cooperative transmission set information including information on a cell based reference signal resource from a base station;
Determining whether a feedback mode is a feedback mode for performing cooperative transmission using a simultaneous transmission method based on the cooperative transmission set information;
When in a feedback mode for performing cooperative transmission using a simultaneous transmission method, generating feedback information including combined precoding information in which all cooperatively transmitted cells are combined; And
And transmitting the feedback information to the base station.
Wherein the generating the feedback information comprises:
And generating feedback information including a scaling factor capable of compensating the combined precoding information so that transmission power of the cooperatively transmitting cells is maximized.
The scaling factor is
And at least one of the number of the cooperatively transmitting cells or the number of antennas of each of the cooperatively transmitting cells.
Communication unit for transmitting and receiving data with the outside; And
Receives cooperative transmission set information including information on a cell-based reference signal resource from the base station through the communication unit, and whether the feedback mode is a feedback mode for performing cooperative transmission using a simultaneous transmission method based on the cooperative transmission set information. In the feedback mode for determining whether to perform cooperative transmission using a simultaneous transmission method, generate feedback information including combined precoding information in which all cooperative transmission cells are combined, and transmit the feedback information through the communication unit. And a control unit for controlling the transmission to the base station.
The control unit,
When generating the feedback information,
And generating feedback information including a scaling factor capable of compensating the combined precoding information so that transmission power of the cooperatively transmitting cells is maximized.
The scaling factor is
And at least one of the number of the cooperatively transmitting cells or the number of antennas of each of the cooperatively transmitting cells.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020120002144A KR20130081138A (en) | 2012-01-06 | 2012-01-06 | Method and device for crs-based cooperative communication system |
PCT/KR2012/010978 WO2013103202A1 (en) | 2012-01-06 | 2012-12-17 | Transceiving method and device for crs-based cooperative communication |
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KR1020120002144A KR20130081138A (en) | 2012-01-06 | 2012-01-06 | Method and device for crs-based cooperative communication system |
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CN115066004A (en) * | 2016-01-21 | 2022-09-16 | 索尼公司 | Electronic device and communication method |
CN108933617B (en) * | 2017-05-22 | 2023-05-26 | 中兴通讯股份有限公司 | Control method, control device and computer readable medium for cooperative cell joint transmission |
WO2021142774A1 (en) * | 2020-01-17 | 2021-07-22 | Oppo广东移动通信有限公司 | Communication method and apparatus, terminal, and storage medium |
CN116419233A (en) * | 2021-12-31 | 2023-07-11 | 中国移动通信有限公司研究院 | Cooperative method and equipment for service transmission |
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KR101530559B1 (en) * | 2009-06-04 | 2015-06-22 | 삼성전자 주식회사 | Method and Apparatus for receiving and transmitting feedback information for CoMP operations in wireless communication cellular systems |
KR101715939B1 (en) * | 2009-06-18 | 2017-03-14 | 엘지전자 주식회사 | Method and apparatus for channel state information feedback |
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