WO2010032791A1 - 基地局装置、端末装置、それらを備えた無線通信システムおよびその基地局に実行させるプログラム - Google Patents
基地局装置、端末装置、それらを備えた無線通信システムおよびその基地局に実行させるプログラム Download PDFInfo
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- WO2010032791A1 WO2010032791A1 PCT/JP2009/066271 JP2009066271W WO2010032791A1 WO 2010032791 A1 WO2010032791 A1 WO 2010032791A1 JP 2009066271 W JP2009066271 W JP 2009066271W WO 2010032791 A1 WO2010032791 A1 WO 2010032791A1
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Definitions
- the present invention relates to a communication technology using a wireless communication technology, and in particular, a base station device that performs cooperative reception between a plurality of base stations and a terminal device, a terminal device, a wireless communication system including them, and a program to be executed by the base station About.
- EUTRA evolved third generation radio access
- EUTRA evolved third generation radio access
- EUTRA evolved third generation radio access network
- EUTRA evolved third generation radio access network
- LTE Long Term Evolution
- OFDMA Orthogonal Frequency Division Multiplexing Access
- Non-patent Document 2 As one of the technologies used for this, inter-cell cooperative reception has been proposed (Non-Patent Documents 3 and 4).
- time division multiplexing TDM is used by using the resources of the frequency axis (subcarrier) and time axis (OFDM symbol) of the OFDM signal.
- Time Division Multiplexing Frequency Division Multiplexing FDM (Frequency Division Multiplexing)
- FDM Frequency Division Multiplexing
- FIG. 17 is a configuration example of a downlink radio frame of EUTRA proposed in 3GPP, and is a diagram illustrating an example of radio channel mapping.
- the downlink radio frame shown in FIG. 17 is composed of a plurality of subcarriers on the frequency axis (vertical axis) and is composed of a frequency bandwidth Bch and a symbol on the time axis (horizontal axis).
- one slot consists of seven symbols, and two slots constitute one subframe.
- a two-dimensional radio resource block is configured by 12 subcarriers ⁇ 7 symbols, and resource block pairs (RB pairs) surrounded by bold lines in FIG. 17 are formed by two radio resource blocks that are continuous on the time axis. It is configured.
- a plurality of resource block pairs (RB pairs) are collected to form a radio frame.
- a minimum unit composed of one subcarrier and one OFDM symbol is referred to as a resource element.
- the entire downlink spectrum (base station specific system frequency bandwidth Bch) is 20 MHz, one radio frame is 10 ms, and the subframe SF is 1 ms.
- a resource block pair (RB pair) is composed of one subcarrier and one subframe (1 ms).
- the subcarrier frequency bandwidth Bsc is 15 kHz
- the frequency bandwidth Bch of the resource block is 180 kHz (15 kHz ⁇ 12)
- 1200 subcarriers are included in the entire 20 MHz band in the downlink.
- the radio frame includes 100 RBs.
- the first, fifth, eighth, and twelfth OFDM symbols are transmitted with the reference (reference) signal RS0 (reference signal in the figure) of the first antenna.
- RS S is omitted, for example, RS0 is shown as R0
- the second antenna reference signal RS1 is included.
- the third antenna reference signal RS2 and the fourth antenna reference signal RS3 are similarly arranged in the second and ninth OFDM symbols. (See Non-Patent Document 1 below).
- Non-Patent Document 4 By using beam forming, it is possible to increase the communicable distance and reduce interference in communication with a plurality of devices.
- LTE when beamforming is applied to transmission to a terminal device, transmission is performed from the sixth antenna, and a terminal-specific reference signal RS5 is transmitted from the sixth antenna.
- FIG. 18 shows an example of the arrangement of RS5.
- the identification code of the reference signal RS5 is generated by a calculation using the intra-cell terminal identifier (Cell-specific-Radio Network Temporary Identifier, hereinafter referred to as C-RNTI) assigned to each terminal and the cell identifier as variables. Assigned when. Further, the arrangement position in the resource element is shifted and arranged in the frequency direction according to the cell identifier.
- C-RNTI Cell-specific-Radio Network Temporary Identifier
- MU-MIMO Multiple terminal multiple input multiple output system
- Multi-Input Multiple-input multiple-output
- MIMO Multi-Output
- Non-patent Document 5 MU-MIMO (multi-user-MIMO) is a method of performing MIMO using a plurality of terminals, and a plurality of terminals can communicate simultaneously using the same frequency.
- each transmitting antenna used for realizing directivity when a base station transmits to a terminal device is used.
- the weighting factor with which the terminal device has the optimal directivity transmitting the weighting factor to be used to the base station device, and holding the weighting factor of the transmitting antenna with the transmitted weighting factor
- the open loop weighting factor scheme includes a direction of arrival estimation (DOA) scheme in which a base station apparatus estimates an arrival direction from an uplink signal of a terminal apparatus, selects a weighting factor that causes directivity in that direction, and transmits. It has been proposed (Non-Patent Document 6).
- DOE direction of arrival estimation
- Non-Patent Documents 2 and 3 Multiple base station signal coordinated reception system Multiple base station signals for simultaneous transmission from a plurality of base stations and reception of signals from a plurality of base stations by the terminal device in order to improve reception characteristics of the terminal device at the cell edge
- a cooperative reception method has been proposed (Non-Patent Documents 2 and 3). With these, signals from a plurality of base station apparatuses are regarded as transmission signals from one antenna, respectively, and MIMO is used to obtain an improvement in reception quality due to a transmission diversity effect, or transmission capacity can be increased due to a spatial multiplexing effect. It is intended to increase.
- FIG. 19 shows an outline of a multiple base station signal cooperative reception system.
- the terminal apparatus UE100 In addition to receiving a signal from the main base station apparatus BS100, the terminal apparatus UE100 also receives signals from neighboring base station apparatuses BS200, BS500, BS600, and BS700 at the same time. In general, when the distance between the terminal device UE100 and the base station device BS100 is long, the reception characteristics are degraded. By receiving signals from other base stations at the same time, deterioration of characteristics is suppressed. Similarly, the terminal apparatus UE101 mainly communicates with the base station apparatus BS100, but since the distance is short, another base station that performs cooperative reception may be one of the BS300. Thus, the position and number of base stations used for cooperative reception are adaptively changed according to the position of the terminal device. The base stations are connected by a communication line called backhaul. For example, the data to be transmitted to the terminal device UE101 includes data transmitted from the base station device BS100 and data transmitted from the BS 300 through the backhaul.
- Non-Patent Document 3 there is a method of using a terminal-specific reference signal that is used when the base station apparatus performs beamforming toward the terminal apparatus.
- the reference signals RS0 to RS3 are used.
- cooperative reception is performed in the same way as normal MIMO.
- the terminal-specific reference signal RS5 from each base station apparatus is generated by calculation using the C-RNTI and the cell identifier of each base station apparatus as variables, but the terminal apparatus is the main transmitting apparatus. Since the information is exchanged only with the mobile station and does not have the cell identifier information of the base station apparatus that performs other coordinated transmission, there is a problem that the identification code of the reference signal is not completely known.
- the C-RNTI is assigned to the terminal device in a state where each base station device is closed in the base station device, there is a possibility that the same C-RNTI has already been assigned between the base stations performing coordinated transmission. Even in this case, since the cell identifiers are different, the identification code of the reference signal specific to each terminal assigned by each base station is generated by calculation using different variables depending on the base station, but the result of the calculation is also different for C-RNTI. Randomness decreases compared to. This causes a decrease in the cross-correlation characteristics of the codes of each RS5, causing erroneous determination and causing performance degradation.
- the terminal-specific reference signal RS5 is arranged in the frequency direction according to the cell identifier as described above, but in the example of FIG. 18, it is arranged every four subcarriers. Means that only four terminal-specific reference signals RS5 from each base station that perform coordinated transmission can be arranged, which means that coordinated transmission using five or more base stations is impossible.
- a cooperative reception method there is a method that uses the common reference signals RS0 to RS3 of the base station apparatus that performs cooperative transmission without using the terminal-specific reference signal RS5.
- RS0 to RS3 are three subcarriers. Since it is arranged for every 3 subcarriers shifted every 3 subcarriers in the frequency direction according to the cell identifier, there are only three types of arrangement patterns. This also means that cooperative reception using four or more base stations is impossible.
- An object of the present invention is to provide a base station apparatus, a terminal apparatus, a wireless communication system including them, and a program to be executed by the base station.
- the present invention performs normal main transmission when a communication target terminal device exists in a cell, and performs coordinated transmission when the communication target terminal device exists in another cell.
- a base station device capable of Reference signal identification code determining means for determining an identification code of a reference signal unique to the terminal device
- reference signal generating means for generating the reference signal based on the determined identification code, and transmitting a signal including the reference signal Transmission means for
- the reference signal generating means may be configured such that the reference signal for cooperative transmission used when the terminal device to be communicated is present in the cooperative transmission cell is different from the reference signal for main transmission used by the base station apparatus that performs main transmission.
- the transmission means transmits the generated reference signal for cooperative transmission to the terminal.
- the reference signal identification code determining means sets the identification code of the reference signal for cooperative transmission to a variable different from the identification code of the reference signal for main transmission of the base station apparatus that performs main transmission with the terminal apparatus to be communicated. It is generated by using.
- the reference signal identification code determining means includes a cell identification code used by the base station apparatus of the main transmission cell, and a cell assigned by the base station apparatus of the main transmission cell to the terminal apparatus.
- the value is generated by a calculation using a value obtained by calculating the internal terminal identifier as a variable.
- the reference signal identification code determining means includes a value of an intra-cell terminal identifier assigned to the terminal device by a base station device of a main transmission cell, and an intra-cell terminal assigned to the terminal device by a base station device of the main transmission cell. A difference from a value obtained by performing a certain calculation on the identifier is obtained, and the difference is transmitted to the terminal device by the transmission means.
- the reference signal identification code determination means uses the cell identifier of the coordinated transmission cell as a variable for generating the identification code of the coordinated transmission reference signal.
- the reference signal identification code determination means includes a cell identifier different from the cell identifier of the main transmission cell for the communication target terminal device as a variable for generating the identification code of the reference signal for cooperative transmission, and the base station apparatus of the main transmission cell Uses an intra-cell terminal identifier assigned to the terminal apparatus.
- the reference signal identification code determination means includes a cell identifier of a connection terminal restricted cell for a communication target terminal device as a variable for generating a reference signal identification code for cooperative transmission, and a base station device of a main transmission cell Among the intra-cell terminal identifiers assigned to the apparatus, some intra-cell terminal identifiers are used.
- the base station apparatus further includes weighting means for determining a weighting coefficient for forming a beam in a direction in which the base station apparatus of the main transmission cell exists, and uses a beamforming method in which the weighting coefficient is transmitted by the transmission means.
- the base station apparatus further comprises weighting means for determining a weighting coefficient for a signal from the base station apparatus based on a cell-specific common reference signal transmitted from each base station apparatus.
- weighting means for determining a weighting coefficient for a signal from the base station apparatus based on a cell-specific common reference signal transmitted from each base station apparatus.
- a multi-terminal multi-input multi-output scheme is used in which the weighting coefficient determined by the weighting means is transmitted to the terminal device by the transmitting means.
- the weighting means determines a weighting coefficient.
- the reference signal generating means is characterized in that the arrangement of the reference signal for cooperative transmission in the resource block is different from the arrangement of the reference signal for main transmission.
- the reference signal generating means performs time division of the reference signal for the main transmission cell and the reference signal for the coordinated transmission cell in the arrangement of the reference signal for cooperative transmission in the resource block.
- the reference signal generating means differs in arrangement of the reference signal for cooperative transmission in the resource block from the arrangement of the reference signal for main transmission
- the reference signals of the overlapping coordinated transmission cells are arranged in other transmission symbols, and the reference signals in some transmission symbols are not transmitted. It is characterized by that.
- the transmission means performs coordinated transmission only in a specific frequency band.
- the transmission means performs coordinated transmission only in a specific time band.
- the present invention is a terminal device capable of simultaneously receiving signals from a plurality of the base station devices and performing cooperative reception.
- Means for simultaneously receiving signals from the base station apparatus propagation path estimation means for estimating propagation path fluctuations based on the received reference signal to obtain propagation path fluctuation compensation values, and based on the propagation path fluctuation compensation values
- Propagation path compensation means for compensating for the propagation path fluctuation of the signal from each base station apparatus.
- the present invention includes the base station device and the terminal device, wherein the terminal device simultaneously receives signals from a plurality of the base station devices.
- the present invention provides a base station apparatus capable of performing normal main transmission if a communication target terminal apparatus exists in a cell, and performing coordinated transmission when the communication target terminal apparatus exists in another cell.
- Reference signal identification code determining means for determining an identification code of a reference signal unique to the terminal apparatus in the base station apparatus, and reference signal generating means for generating the reference signal based on the determined identification code, Make it work
- the reference signal generating means may be configured such that the reference signal for cooperative transmission used when the terminal device to be communicated is present in the cooperative transmission cell is different from the reference signal for main transmission used by the base station apparatus that performs main transmission. And transmitting the reference signal to the terminal device by the transmission means.
- a wireless communication system including a plurality of base station devices and terminal devices, wherein the terminal devices perform cooperative reception in a communication system that simultaneously receives signals from a plurality of base stations. It is possible to reduce the restrictions caused by the generation of the identification code of the reference signal to be used and the arrangement of the reference signal.
- FIG. 1 is a diagram illustrating a wireless communication system that performs coordinated reception using a plurality of base stations according to the first embodiment of the present invention, and a reference used when a terminal apparatus demodulates a signal from a single base station. It is a conceptual diagram which shows the case where a reference signal different from a signal is used. For the sake of simplicity, three cells of three base station apparatuses BS100, BS200, and BS300 will be described. However, the actual number of base stations may be other numbers as shown in FIG.
- the terminal device UE201 to the terminal device UE205 are terminal devices that exist within the cell area of the base station device BS200, and communicate with the base station device BS200. Also, the terminal device UE301 to the terminal device UE305 are terminal devices that exist within the cell area of the base station device BS300, and communicate with the base station device BS300. It is assumed that a reference signal specific to the terminal device from each base station is used for demodulation of the signal from each base station device.
- the cell of the base station device when a terminal device to be communicated exists in the cell of the base station device, the cell of the base station device is called a main transmission cell, there is no terminal device to be communicated in the cell of the base station device, A cell of the base station device when the base station device performs coordinated transmission to the terminal device is referred to as a coordinated transmission cell.
- the terminal apparatus UE201 uses a single base station apparatus BS200 (as an identification code of a reference signal unique to the terminal apparatus transmitted from the base station apparatus BS100 (a reference signal identification code different from the reference signal used when demodulating the signal from the base station apparatus of the main transmission cell is used.
- This reference signal identification code is generated using a variable different from the variable used when generating the reference signal identification code when base station apparatus BS100 communicates with a single base station apparatus BS200.
- This code a code having higher randomness than the code of the reference signal is used. Thereby, the identification codes of the reference signals used in the base station apparatuses BS100 and BS200 are ensured to be random.
- a cell identifier of the coordinated transmission cell and a value obtained by calculating the intra-cell terminal identifier (C-RNTI) assigned to the terminal by the main transmission cell As a variable, there is a method of generating by performing an operation.
- a reference signal identification code for communication with a single base station is a cell identifier and a value obtained by performing an operation on an intra-cell terminal identifier (C-RNTI) assigned to a terminal by a transmitting cell.
- C-RNTI intra-cell terminal identifier
- it is generated by performing an operation. Specifically, the initial value of the identification code of the reference signal is given below.
- Initial value of identification code f (CellID, C-RNTI, Slot #) (1)
- CellID represents a cell identifier
- Slot # represents a slot number including a reference signal.
- FIG. 2 shows a procedure from establishing a connection between a base station apparatus and a terminal apparatus of a main transmission cell in LTE to performing data communication.
- Base station apparatus BS200 transmits a synchronization signal (L1).
- the synchronization signal includes information on the cell identifier of the base station apparatus BS200, and the terminal apparatus UE201 receives this synchronization signal and recognizes the cell identifier of the base station apparatus BS200, thereby determining the base station apparatus BS200. This can be performed together with the synchronization establishment (S1).
- base station apparatus BS200 is also transmitting the common reference signal of the cell (L2). Further, information depending on the base station device BS200 is transmitted as a notification signal (L3).
- the terminal device UE201 acquires information depending on the base station device BS200 by receiving the notification signal (S2). Note that these synchronization signal, common reference signal, and notification signal are always transmitted regularly regardless of the following steps.
- the terminal apparatus UE201 transmits a random access request to the base station apparatus BS200 in order to establish a connection with the base station apparatus BS200 (L4).
- the base station device BS200 recognizes the terminal device UE201 by a random access request from the terminal device UE201, and issues an intra-cell terminal identifier (C-RNTI) and assigns it to the terminal device UE201 if connection establishment is permitted.
- Terminal device individual information is set (S3), and is transmitted to the terminal device UE201 as a response to the random access request (L5). By receiving this, the terminal device UE201 acquires terminal device individual information including the intra-cell terminal identifier (C-RNTI) (S4).
- the base station apparatus BS200 performs scheduling for transmitting data in the downlink (S5), and transmits scheduling information (L6). ),
- the terminal device UE201 receives the scheduling information (S7).
- Base station apparatus BS200 produces
- base station apparatus BS200 may generate and transmit a reference signal for each terminal simultaneously with the transmission of the downlink data signal.
- the base station device BS200 updates the individual information related to the terminal device UE201 (S9) and transmits it to the terminal device (L8).
- the terminal device UE201 receives this and updates the information (S10).
- the identification code of the reference signal transmitted by the main transmission cell BS200 is generated by the same method as the equation (1), but the identification code of the reference signal transmitted by the cooperative transmission cell BS100 is as follows: Generate by expression.
- Initial value of identification code f (CellID, g (C-RNTI), Slot #) (2)
- CellID is not the cell identifier of cooperative transmission cell BS100, but the cell identifier of main transmission cell BS200.
- g (C-RNTI) a value obtained by performing operation g on C-RNTI assigned to terminal apparatus UE201 by main transmission cell BS200 is used. The operation g may simply add a certain constant, or another function may be prepared.
- the base station device of the cooperative transmission cell transmits the identification code of the reference signal specific to the terminal of the cooperative transmission cell to the terminal device. Therefore, there is an advantage that it is not necessary to transmit information.
- the specific calculation content of the calculation g is not particularly defined. In this case, it is necessary to transmit the information for identifying the identification signal of the reference signal unique to the cooperative transmission cell from the base station apparatus of the cooperative transmission cell to the terminal apparatus. Only the difference between the C-RNTI and this g (C-RNTI) used for generating the identification code of the reference signal of the coordinated transmission cell may be transmitted to the terminal device. Since this difference is smaller than the number of bits required to represent the entire identification code of the reference signal, there is also an advantage that the transmission capacity can be saved during transmission.
- the procedure of cooperative reception among the terminal device UE201, the transmission device (main transmission device) BS200 of the base station device of the main transmission cell, and the transmission device (cooperation transmission device) BS100 of the base station of the coordinated transmission cell 3 will be described with reference to the generation and notification of the identification code of the reference signal.
- the terminal apparatus UE201 has already established a connection with the transmission apparatus (main transmission apparatus) BS200 of the main base station, and that the BS100 is about to newly perform cooperative transmission.
- the steps up to that point are the same as the conventional LTE steps, and thus the description thereof is omitted.
- the main transmitter BS200 and the cooperative transmitter BS100 transmit their common reference signals (L11, L12).
- the terminal device UE201 always checks the status of the reference signal, and when the reception state changes, creates a measurement report (S11) and transmits the measurement report to the base station device BS200 that has established a connection (L13). .
- the reception status of the BS 200 with which the terminal device UE201 has established a connection is deteriorating, while the reception status of the other transmission device BS100 is in a good state to some extent.
- the base station apparatus (main transmission apparatus) BS200 that has received the measurement report and currently established a connection determines that cooperative reception is necessary (S12), scheduling for cooperative reception is performed (S13).
- a request is made to the base station BS100 that performs transmission (L14). If it is determined that the base station BS100 that performs the coordinated transmission is possible (S14), an acknowledgment is transmitted (L15), and the main transmission device BS200 updates the individual information of the terminal device UE201 to perform the coordinated transmission.
- the identification code of the individual reference signal used by the transmission device BS100 is generated by the above-described method (S15).
- the individual information is transmitted to the terminal device UE201.
- the calculation used to generate the identification code of the reference signal is a system that is not shared between the terminal apparatus and the base station apparatus, for example, the above-described C-RNTI and g (C-RNTI) and Is also transmitted here (L16).
- the terminal device UE201 updates the individual information and confirms the identification code of the terminal individual reference signal used by the cooperative transmission device BS100 (S16).
- the main transmission device BS200 generates downlink data for cooperative transmission (S17), and transmits it to the cooperative transmission device BS100 together with the identification code of the generated individual reference signal (L17).
- the cooperative transmission device BS100 receives the downlink data and the identification code of the individual reference signal from the main transmission device BS200, and generates the cooperative reception individual reference signal and the downlink data (S18).
- the base station apparatus BS200 transmits scheduling information to the terminal apparatus UE201 (L18).
- the terminal device UE201 acquires and confirms schedule information (S19).
- the main transmitter BS200 transmits the downlink data and the reference signal to the terminal device UE201 (L19).
- the cooperative transmission device BS100 transmits the generated cooperative reception individual reference signal and downlink data to the terminal device UE201 (L20).
- the terminal device UE201 receives these signals and performs cooperative reception (S20).
- the cell identifier is used as a variable used for generating the terminal-specific reference signal identification code of the main transmission cell as a variable used for generating the terminal-specific reference signal identification code.
- the identification code of the reference signal transmitted by the coordinated transmission cell BS100 is generated by the following equation.
- the terminal device UE201 needs to know the cell identifier CellID-Corp of the cooperative transmission cell BS100 in order to obtain the identification code of the terminal individual reference signal transmitted from the cooperative transmission cell BS100. Since information is exchanged only with the transmitting device BS200, it must be transmitted separately. This is performed in L16 from the main transmission device BS200 to the terminal device UE201.
- the bit information of the cell identifier is smaller than the required number of bits of the identification code of the C-RNTI or the reference signal, so that there is an advantage that the amount of information to be transmitted is reduced even in this case.
- cell identifiers used for single reception have values of 0 to 503, which can be represented by 9 bits. However, 504 to 511 are not used even though they are represented by 9 bits.
- FIG. 4 illustrates this concept.
- these unused identifiers are used as variables used for generating the identification code of the terminal-specific reference signal in cooperative reception. Specifically, the generation is performed by the following formula.
- a cell identifier of a connected terminal restricted cell and a part of in-cell terminal identifiers are used.
- C-RNTI reserved for cooperative reception
- a connection terminal restricted cell in which terminals that can be connected is restricted is defined, and the cell identifier for this cell may be assigned a part of the cell identifier that is defined exclusively for this cell use. Proposed.
- Figure 5 illustrates this concept.
- cell identifiers 0 to 383 are used for single reception, and 384 to 503 are used for connected terminal restricted cells.
- the cell identifier of this connected terminal restricted cell is used as a variable used for generating the identification code of the terminal-specific reference signal used for cooperative reception, and the C-RNTI is reserved for cooperative reception.
- C-RNTI is used. Therefore, in FIG. 5, C-RNTIs 0 to 32767 are used for connected terminal restricted cells and 32768 to 65535 are used for cooperative reception.
- the connection terminal restricted cell is usually small and has a small number of accommodating terminal devices. Therefore, there is no problem even if a part of the C-RNTI is reserved for cooperative reception in the connected terminal restricted cell. Thereby, the identification code different from the identification code of the existing terminal individual reference signal can be reliably generated at the time of cooperative reception.
- FIG. 6 shows an example of a radio communication system that performs coordinated reception using a plurality of base stations according to the second embodiment of the present invention, and uses an adaptive beamforming method for transmission from the base stations. It is a thing.
- the terminal apparatus UE100 communicates with the base station apparatus BS100 as a main transmission cell. However, when the terminal apparatus UE100 is located at the cell edge, the terminal apparatus UE100 simultaneously receives signals from the base station apparatuses BS200 and BS300 and performs cooperative reception. When receiving signals from the base station devices BS200 and BS300, which beam pattern is formed, that is, which weighting factor is used, each base station arbitrarily determines and determines. Since the base station apparatuses BS200 and BS300 that perform coordinated transmission are informed in advance of which base station apparatus to use as the main transmission cell through backhaul, it is necessary to perform coordinated transmission. What is necessary is just to select a weighting coefficient and form a beam pattern so that a beam pattern may be formed in the base station apparatus in which a main transmission cell exists.
- the base station apparatus BS200 selects a weighting factor for forming the beam 4, which is a beam pattern in the direction in which the base station apparatus BS100 exists.
- Base station apparatus BS300 selects a weighting factor that forms beam 6, which is a beam pattern in the direction in which base station apparatus BS100 exists.
- the beam pattern selection method in the base station apparatuses BS100, BS200, and BS300 is simplified.
- the terminal device UE100 has an advantage that it is not necessary to exchange information necessary for checking the weighting coefficient with each of the base station devices BS100, BS200, and BS300, and also saves radio resources.
- Each base station apparatus BS100, BS200, and BS300 weights the downlink data signal and the terminal-specific reference signal with the selected weighting coefficient, and performs transmission.
- the identification code of the terminal-specific reference signal is generated using the method described above.
- FIG. 7 shows an example of arrangement of terminal-specific reference signals in resource blocks used when coordinated reception is performed using a plurality of base station apparatuses BS200 and BS300 as coordinated transmission cells.
- R6 represents a terminal-specific reference signal used for cooperative reception transmitted from the base station apparatus BS200
- R7 represents a terminal-specific reference signal used for cooperative reception transmitted from the base station apparatus BS300.
- the arrangement of terminal-specific reference signals in resource blocks is shifted in the frequency direction by a unique shift amount in accordance with the cell identifier, but there are many combinations of cells that perform coordinated transmission. Therefore, it is not guaranteed that the shift amount based on the cell identifier of each cell is a different shift amount.
- the arrangement position of the terminal-specific reference signal from the coordinated transmission cell is determined regardless of the value of the cell identifier of the cell performing the coordinated transmission.
- the main transmission cell requests another base station apparatus to perform coordinated transmission
- notification is made with the shift amount so that the arrangement positions do not overlap.
- the BS 100 transmits the shift amount to the coordinated transmission cell BS200 when the terminal device receives a signal from the BS 200 using the cell identifier of the BS 200 alone.
- a notification that the shift amount is 2 is sent, and a notification that the shift amount is 3 is similarly sent to the coordinated transmission cell BS 300 regardless of the cell identifier of the BS 300.
- the arrangement position is duplicated regardless of the cell identifier of the base station apparatus performing coordinated reception by performing an arrangement different from the terminal-specific device used when not performing coordinated reception.
- the reference signals can be arranged without doing so.
- the arrangement position of the cooperative cell is notified from the main transmission cell BS100 to the terminal apparatus UE100 as part of the terminal apparatus individual information, and the terminal apparatus UE100 can know the arrangement position.
- FIG. 8 shows an example in which the terminal-specific reference signals of the coordinated transmission cell of the base station apparatus performing coordinated transmission are arranged in a time division manner according to the third embodiment of the present invention.
- R8 represents the terminal-specific reference signal of the third coordinated transmission cell.
- the terminal-specific reference signals are arranged in 12 resource elements for one transmission cell per resource block pair.
- the ratio of the number of reference signals increases.
- the number of resource elements used for transmitting downlink data increases and the number of resource elements decreases.
- the reference signal specific to the terminal of the coordinated transmission cell of the base station apparatus that performs coordinated transmission is arranged in a time division manner, thereby reducing a reduction in the number of resource elements used for transmission of downlink data.
- the demodulation characteristic deteriorates when the terminal device moves at high speed, but the terminal moving at high speed
- the apparatus does not remain in a position where signals can be stably received from a plurality of base station apparatuses, and is difficult to be a target of cooperative reception.
- FIG. 9 shows an example of a communication system according to a fourth embodiment of the present invention, in which the method of cooperative reception is a multiple terminal multiple input multiple output scheme (MU-MIMO).
- the reference signal is not a terminal-specific reference signal but a cell-specific reference signal.
- FIG. 10 is a diagram illustrating an example of an arrangement position in a resource block of a reference signal unique to a terminal when performing cooperative reception. Common reference signals RS0 to RS3 transmitted from each base station apparatus are used, and twelve common reference signals are used for convenience.
- RS0 to RS3 transmitted from each base station apparatus are used, and twelve common reference signals are used for convenience.
- the number described after the subscript “-” such as “R0-2” means the base station apparatus that transmits the common reference signals RS0 to RS3, and “ ⁇ 1” is from the base station apparatus BS100.
- the transmitted common reference signal, “ ⁇ 2” means a common reference signal transmitted from the base station apparatus BS200
- “ ⁇ 3” means a common reference signal transmitted from the base station apparatus BS300.
- the terminal device UE100 uses the BS 100 as a main base station device, and also performs simultaneous reception of signals from the BS 200 and the BS 300 that perform coordinated transmission, and performs coordinated reception. Similarly, the terminal device UE103 performs cooperative reception.
- the main transmission cell determines a weighting coefficient so that downlink data to the terminal apparatuses UE100 and UE103 is separated, generates downlink data, and is transmitted from each transmission cell.
- the location of the cell-specific reference signal in the resource element is uniquely determined based on the cell identifier as in the case of the terminal-specific reference signal.
- the arrangement position of the cell-specific reference signal in the resource block in the frequency direction is every three subcarriers, and therefore, non-overlapping arrangement is limited to a maximum of three cells (see FIG. 10). However, even if there are three transmission cells, the arrangement positions of the reference signals do not necessarily overlap.
- the reference signal arrangements when cell-specific reference signal arrangements overlap, the reference signal arrangements are arranged in other transmission symbols, and the reference signals in some transmission symbols are not transmitted so that the duplication is avoided. Realize no placement. Since some reference signals are transmitted, the number in the time axis direction decreases, so that when the terminal device moves at high speed, the demodulation characteristics deteriorate, but the terminal device that moves at high speed There is no problem because it does not remain at a position where signals can be stably received from a plurality of base station apparatuses, and it is difficult to be a target of cooperative reception.
- FIG. 11 is an example of the arrangement of cell-specific reference signals in the present embodiment.
- the subscript -13 indicates that the arrangement position of the cell-specific reference signal of the main transmission cell of the base station apparatus BS100 and the arrangement position of the cell-specific reference signal of the coordinated transmission cell of the base station apparatus BS300 used for coordinated reception. Shows that they are overlapping.
- the subscript -2 represents the arrangement position of the cell-specific reference signal of the coordinated transmission cell of the base station apparatus BS200 used for coordinated reception.
- the subscript -3 indicates that the cell-specific reference signal of the coordinated transmission cell of the base station apparatus BS300 whose arrangement position overlaps with the reference signal of the main transmission cell of the base station apparatus BS100 is transmitted again at this position. Yes.
- the reference signal of the BS 300 in the fifth and twelfth OFDM symbols, it is possible to reduce a decrease in resource elements in which downlink data can be arranged.
- the reference signal of the BS 300 in the fifth and twelfth OFDM symbols may be transmitted again, for example, in the seventh and fourteenth OFDM symbols, as in the case of other overlapping OFDM symbols.
- Which OFDM symbol is used to retransmit the cell-specific terminal signal is notified from the main transmission cell BS100 to the terminal apparatus UE100 and the terminal apparatus UE103 as part of the terminal apparatus individual information, and the terminal apparatus knows the arrangement position. Can do.
- FIG. 12 is an example showing a communication system using direction of arrival estimation as a method of cooperative reception according to the fifth embodiment of the present invention.
- the BS 100 uses the base station apparatus determined based on the arrival angle of the uplink transmission signal from the terminal signal, not the direction of the main transmission cell in which the terminal apparatus is informed through the backhaul, in selecting the weighting coefficient.
- the coordinated reception is always performed in the direction of the main transmission cell as viewed from the base station apparatus BS200.
- a terminal does not always exist.
- a beam can be formed by appropriately selecting a weighting factor based on the arrival angle of the uplink transmission signal, so that even when the beam direction is different from the direction of the base station apparatus, such as a reflection path, cooperative reception is possible. Become.
- FIG. 13 is an example showing a communication system according to a sixth embodiment of the present invention in which cooperative reception is performed only in a specific frequency band.
- the frequency band used for cooperative reception between cells is fixed as subbands 1 to 3 in the entire system frequency band.
- Subband 1 is a frequency band used in base station apparatus BS100
- subband 2 is a frequency band used in base station apparatus BS200
- subband 3 is a frequency band used in base station apparatus BS300.
- FIG. 14 is an example showing a communication system according to a seventh embodiment of the present invention in which cooperative reception is performed only in a specific time band.
- time bands used for cooperative reception between cells are periodically provided as subframes 1 to 3.
- Subframe 1 is a time band used in base station apparatus BS100
- subframe 2 is a time band used in base station apparatus BS200
- subband 3 is a time band used in base station apparatus BS300. In this way, by making the time band for performing cooperative reception unique among the cells performing cooperative reception, interference between cooperative reception signals between cells can be prevented.
- FIG. 15 is a functional block diagram showing an example of the configuration of the transmission apparatus of the base station apparatus used in the embodiment of the present invention.
- the downlink data to be transmitted is input to the transmission apparatus 1 of the base station apparatus.
- reference code identification codes and arrangement position information used by the cooperative transmission cell weighting information, scheduling information, base station-dependent information, information unique to the terminal device, and the like are also input.
- These pieces of information are input to the control signal processing unit 8 as control information, processed and transmitted to the terminal device, while some information (broadcast information and notification information) is transmitted to the data signal processing unit 3 in the downlink data transmission format. Input, processed and sent.
- These signals input to the data signal processing unit 3 are input to the internal turbo coding unit 4.
- the turbo coding unit 4 performs error correction coding using a turbo code to increase error tolerance of input data in accordance with a coding rate instruction from the control unit (CPU) 15.
- the next-stage data modulation unit 5 includes QPSK (Quadrature Phase Shift Keying; four-phase phase shift keying), 16QAM (16 Quadrature Amplitude Modulation), 64QAM (64 Quadrature Amplitude Modulation value, etc.).
- QPSK Quadratture Phase Shift Keying; four-phase phase shift keying
- 16QAM (16 Quadrature Amplitude Modulation
- 64QAM 64 Quadrature Amplitude Modulation value, etc.
- the precoding unit 6 performs phase rotation, weighting, redundancy, and the like on the signal modulated by the data modulation unit 5 based on an instruction from the control unit 15, thereby transmitting each signal to each terminal device. Generate a signal.
- the weighting unit 7 weights the signal from the precoding unit 6 based on an instruction from the control unit 15 and outputs the weighted signal to the multiplexing / mapping unit 16.
- the weighting unit 7 may be included as part of the weighting function of the precoding unit 6, but will be described as a separate configuration in FIG.
- a plurality of data signal processing units 3 are provided. Each processing content is the same.
- the control information is input to the convolutional code unit 9 of the control signal processing unit 8.
- the convolutional code unit 9 performs error correction coding using a convolutional code to increase the error tolerance of the input information in accordance with the coding rate instruction from the control unit 15.
- the QPSK modulation unit 10 modulates the control information that has been subjected to error correction coding by the convolutional coding unit 9 using the QPSK modulation method.
- the precoding unit 11 performs phase rotation, weighting, redundancy, and the like on the signal modulated by the QPSK modulation unit 10 based on an instruction from the control unit 15, thereby transmitting each signal to each terminal device. Generate a control signal.
- the weighting unit 12 weights the signal from the precoding unit 11 based on the power determined by the control unit 15 and outputs the weighted signal to the multiplexing / mapping unit 16.
- the weighting unit 12 may be included as a part of the weighting function of the precoding unit 11 as in the case of the data signal processing unit 3.
- the reference signal generation unit 13 generates a reference signal transmitted by each transmission antenna 22 of the transmission apparatus 1 by performing QPSK modulation based on the identification code designated by the reference signal identification code determination unit 14.
- each control unit 15 is instructed to transmit each downlink data, control information, and reference signal output from each data signal processing unit 3, control signal processing unit 8, and reference signal generation unit 13.
- the allocation to the resource element is determined, a signal for each antenna is generated, and sent to the OFDM transmitters 23 to 27 of each antenna.
- OFDM transmission units 23 to 27 (in the figure, OFDM transmission unit 23 that performs data transmission by beamforming and OFDM transmission units 24 to 27 that transmit cell-specific terminal signals without performing data transmission by beamforming are provided.
- OFDM transmission unit 23 that performs data transmission by beamforming
- OFDM transmission units 24 to 27 that transmit cell-specific terminal signals without performing data transmission by beamforming
- IFFT Inverse Fourier Transform
- CP insertion unit 18 a D / A unit 20
- transmission RF unit 21 a transmission antenna 22
- the D / A unit and the subsequent portions correspond to N antennas 22-1 to 22-N used for beam forming, respectively.
- transfer units 19-1 to 19-N for shifting the phase in order to form a beamforming beam pattern are provided, which are controlled by the antenna directivity control unit 14.
- the Signals output from the antennas 22-1 to 22-N are spatially combined and transmitted as signals output from one virtual antenna 22 having a beam pattern.
- the IFFT unit 17 performs fast inverse Fourier transform on the signal input from the multiplexing / mapping unit 16 to perform OFDM modulation.
- the CP insertion unit 18 generates a symbol in the OFDM scheme by adding a cyclic prefix (CP) to the OFDM-modulated signal.
- the cyclic prefix can be obtained by a known method for duplicating a part of the beginning or end of a symbol to be transmitted.
- the D / A unit 20 D / A converts the baseband digital signal input from the CP insertion unit 18 into an analog signal.
- the transmission RF unit 21 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 20, removes an extra frequency component with respect to the intermediate frequency band, and converts the intermediate frequency signal to a high frequency.
- the signal is converted (up-converted) into the above signal, excess frequency components are removed, power amplification is performed, and the signal is output to the transmission antenna 22. Note that the actual number and configuration of OFDM transmitters differ depending on the base station apparatus.
- FIG. 16 is a functional block diagram illustrating an example of a configuration of a receiving device of a terminal device used in the embodiment of the present invention.
- the receiving apparatus 31 includes an antenna 32, a reception RF unit 33, an A / D unit 34, a CP removing unit 35, an FFT unit 36, and a demultiplexing unit 37.
- Unit 45 convolution decoding unit 46, control unit 47, and weight mode determination unit 48.
- the reception RF unit 33 amplifies the signal received via the reception antenna 32, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and sets the amplification level so that the signal level is properly maintained. Control and perform quadrature demodulation based on the in-phase and quadrature components of the received signal.
- the A / D unit 34 converts the analog signal orthogonally demodulated by the reception RF unit 33 into a digital signal.
- the CP removing unit 35 removes a portion corresponding to a cyclic prefix from the digital signal output from the A / D unit 34.
- the FFT unit 36 performs fast Fourier transform on the signal input from the CP removal unit 35 and performs demodulation of the OFDM method.
- the propagation path compensation unit 39 to the turbo decoding unit 42 are used for data signal demodulation processing, and the propagation path compensation unit 43 to the convolutional decoding unit 46 are used for control information signal demodulation processing.
- the demultiplexing unit 37 Based on an instruction from the control unit 47, the demultiplexing unit 37 extracts a reference signal from the signal that is FFT-transformed by the FFT unit 36, that is, a received signal demodulated by the OFDM method, from the arranged resource elements and outputs the extracted reference signal. Specifically, the demultiplexing unit 37 extracts a reference signal having a fixed arrangement and outputs the reference signal to the propagation path estimation unit 38. The demultiplexing unit 37 also separates the downlink data signal and the control information signal.
- the propagation path estimation unit 38 includes the antenna ports 0 to 3 and the OFDM ports of the transmission antenna 22 connected to the OFDM transmission units 24 to 27 of the transmission apparatus 1 based on the reception results of the known reference signals separated and extracted by the demultiplexing unit 37.
- a propagation path fluctuation is estimated for each of the antenna ports 5-1 to 5-n of the transmission antenna 22 connected to the transmission section 23, and a propagation path fluctuation compensation value is output.
- the propagation path compensators 39 and 43 compensate the propagation path fluctuation of the input signal based on the propagation path fluctuation compensation value from the propagation path estimation section 38.
- Multiplex mode restoration units 40 and 44 determine the signal power determination unit (not shown) based on the multiplexing mode used by the transmission apparatus for the signals compensated for propagation path fluctuations by propagation path compensation units 39 and 43, respectively. In consideration of data power, the frequency set of each antenna of the transmission signal generated by the transmission apparatus is reproduced and combined to generate a signal before redundancy.
- the data demodulation unit 41 demodulates the data signal generated by the multiple mode restoration unit 40. This demodulation is performed corresponding to the modulation method used in the data modulation unit 5 of the transmission apparatus 1, and information on the modulation method is instructed from the control unit 47.
- the turbo decoder 42 decodes the data signal demodulated by the data demodulator 41. Notification information and broadcast information are extracted from the decoded data and input to the control unit 47. Information regarding the weight is input to the weight mode determination unit 48.
- the QPSK demodulator 45 performs QPSK demodulation of the control information signal generated by the multimode restoration unit 44.
- the convolutional decoding unit 46 decodes the control information signal demodulated by the multimode restoration unit 44.
- the control unit 47 also analyzes the identification code of the reference signal to be used, information on the arrangement position, weighting information, scheduling information, base station-dependent information, information specific to the terminal device, and the like. Control each part.
- the reference signal identification code generation method, the reference signal arrangement position will be described as a generation method in the main transmission cell, and the arrangement position will be described as a generation method and arrangement position similar to the case where the main transmission cell does not perform cooperative reception. However, this may be different from the generation method and arrangement position when the main transmission cell does not perform cooperative reception.
- this invention shows the example applied when the cyclic prefix length is a normal length as defined in Non-Patent Document 1, other situations, for example, when the cyclic prefix length is an extended length are shown. You may apply.
- a program for realizing the functions described in the present embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute processing of each unit. May be performed.
- the “computer system” here includes an OS and hardware such as peripheral devices.
- the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
- the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case is also used to hold a program for a certain period of time.
- the program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions in combination with a program already recorded in a computer system.
Abstract
Description
OFDMA方式における下りリンク無線チャネルの配置については、OFDM信号の周波数軸(サブキャリア)と時間軸(OFDMシンボル)とのリソースを用いて、時間分割多重TDM(Time Divion Multiplexing)、周波数分割多重FDM(Frequency Divion Multiplexing)、または、TDM・FDMの組み合わせで、時間・周波数に多重する方法が提案されている。
複数のアンテナを並べて構成するアレーアンテナを用いることで、送受信アンテナのビームパターンのゲインや指向性を可変させる、前述のビームフォーミングと称する技術が実現できる。(非特許文献4)。ビームフォーミングを用いることで通信可能距離の拡大や、複数装置での通信における干渉低減を図ることが出来る。LTEでは端末装置への送信にビームフォーミングが適用される場合は、第6のアンテナから送信が行なわれ、第6のアンテナから端末固有の参照信号RS5が送信される。図18にRS5の配置の一例を示す。参照信号RS5の識別符号は端末毎に割り当てられるセル内端末識別子(Cell-specific-Radio Network Temporary Identifier、以下C-RNTIと称する)およびセル識別子を変数とする演算により生成され、端末との通信の際に割り当てられる。また、そのリソースエレメントへの配置位置は、セル識別子に応じて周波数方向へシフトされ、配置される。
同一周波数において、複数の送信アンテナおよび複数の受信アンテナを用いて送受信を行い、送受信アンテナ間で複数の伝搬路が生起することを利用して伝搬路多重を行う、複数入力複数出力(Multi-Input Multi-Output、以下MIMOと称する)が提案されている(非特許文献5)。MU-MIMO(複数ユーザ-MIMO)は、複数の端末を用いてMIMOを実施するものであり、同一周波数を用いて複数の端末が同時に通信を行うことができる。
ビームフォーミングを行うには、基地局が端末装置へ送信する際に指向性を実現するために使用する各送信アンテナの重み係数を、端末装置が最適な指向性となるものを選択し、基地局装置へ使用する重み係数を送信し、基地局装置が送信された重み係数で持って送信アンテナの重み付けを行うことで、最適な指向性を実現する、閉ループ重み係数フィードバック方式と、端末装置から重み係数の送信を行わないで、基地局が独自に重み係数を選択し重み付けを行う開ループ重み係数方式がある。開ループ重み係数方式には、基地局装置が端末装置の上り信号から到来方向を推定し、その方向に指向性を生じさせる重み係数を選択して送信を行う、到来方向推定(DOA)方式が提案されている(非特許文献6)。
セル端での端末装置の受信特性改善のため、複数の基地局から同時に送信を行い、端末装置で複数の基地局からの信号を受信する、複数基地局信号協調受信方式が提案されている(非特許文献2、3)。これらは、複数の基地局装置からの信号を、それぞれ1つのアンテナからの送信信号とみなして、MIMOを行うことで送信ダイバシティ効果による受信品質の向上効果を得たり、空間多重効果により伝送容量の増大を図るものである。図19は複数基地局信号協調受信方式の概要を表したものである。端末装置UE100は主となる基地局装置BS100からの信号を受信するほかに、周辺の基地局装置BS200、BS500、BS600、BS700からの信号も同時に受信する。端末装置UE100と基地局装置BS100との距離が離れている場合、一般的には受信特性が低下する。これを他の基地局からの信号も同時に受信することで特性の劣化を抑える。端末装置UE101は同じく基地局装置BS100と主として通信を行うが、距離が近いため協調受信を行う他の基地局はBS300の一つでよい。このように、端末装置の位置により、協調受信に用いる基地局の位置や数を適応的に変化させる。基地局間はバックハウルと呼ぶ通信回線で接続されている。たとえば端末装置UE101へ送信するデータは、基地局装置BS100から送信されるデータと、バックハウルを通じてBS300から送信されるデータにより構成される。
前記端末装置に固有の参照信号の識別符号を決定する参照信号識別符号決定手段と、決定された前記識別符号に基づいて前記参照信号を生成する参照信号発生手段と、前記参照信号含む信号を送信する送信手段と、を備え、
前記参照信号発生手段は、通信対象の前記端末装置が協調送信セル内に存在する場合に用いる協調送信用参照信号が、主送信を行う基地局装置が用いる主送信用の参照信号とは異なるように生成し、前記送信手段は前記端末に生成した協調送信用参照信号を送信することを特徴とする。
前記基地局装置からの信号を同時に受信する手段と、受信した参照信号に基づいて伝搬路変動を推定して伝搬路変動補償値を求める伝搬路推定手段と、前記伝搬路変動補償値に基づいて各基地局装置からの信号の伝搬路変動の補償を行う伝搬路補償手段と、を備えることを特徴とする。
前記基地局装置に、前記端末装置に固有の参照信号の識別符号を決定する参照信号識別符号決定手段と、決定された前記識別符号に基づいて前記参照信号を生成する参照信号発生手段と、として機能させ、
前記参照信号発生手段は、通信対象の前記端末装置が協調送信セル内に存在する場合に用いる協調送信用参照信号が、主送信を行う基地局装置が用いる主送信用の参照信号とは異なるように生成し、送信手段により前記端末装置に参照信号を送信させることを実行させることを特徴とする。
図1は、本発明の第1の実施の形態による複数基地局を用いる協調受信を行う無線通信システムを示す図であり、端末装置が単一の基地局からの信号を復調する際に用いる参照信号とは異なる参照信号を用いる場合を示す概念図である。簡単のため、3つの基地局装置BS100、BS200、BS300の3セルを考え説明するが、実際の基地局の数は図19に示したように他の数でも構わない。
ここで、基地局装置のセル内に通信対象の端末装置が存在する場合の該基地局装置のセルを主送信セルと呼び、基地局装置のセル内に通信対象の端末装置が存在せず、該基地局装置が該端末装置に協調送信を行う場合の該基地局装置のセルを協調送信セルと呼ぶ。
LTEにおいては、単一の基地局と通信を行う場合の参照信号の識別符号は、セル識別子と、送信セルが端末に割り当てたセル内端末識別子(C-RNTI)に演算を施した値とを変数として、演算を行うことにより生成される。具体的には、参照信号の識別符号の初期値が下記で与えられる。
ここで、CellIDはセル識別子を、Slot#は参照信号が含まれるスロット番号を表す。
ここで、CellIDは、協調送信セルBS100のセル識別子ではなく、主送信セルBS200のセル識別子である。g(C-RNTI)は、主送信セルBS200が端末装置UE201へ割り当てたC-RNTIに対して、演算gを施したものを使用する。演算gは、単に一定の定数を加算するものとしても良いし、別の関数を用意しても良い。
ここで、CellID-Corpは、協調送信セルBS100のセル識別子である。
ここで、CellID-Extは、今のLTEで使用されていないセル識別子である。
図6は、本発明の第2の実施の形態である、複数基地局を用いる協調受信を行う無線通信システムであって、前記基地局からの送信に適応ビームフォーミング方式を用いる場合の一例を示したものである。
図8は本発明の第3の実施の形態である、協調送信を行なう基地局装置の協調送信セルの端末固有の参照信号を時分割で配置する例を示したものであり、主送信セルと、3つの協調送信セルを用いる場合の配置例である。ここで、R8は第3の協調送信セルの端末固有参照信号を表す。端末固有の参照信号は、1リソースブロックペアあたり、1送信セルについて12個のリソースエレメントに配置されるのであるが、協調送信を行なう基地局装置の数が多くなると、参照信号の数の割合が多くなり、ダウンリンクデータの送信に用いるリソースエレメント数が減少するという問題がある。本実施形態においては、協調送信を行なう基地局装置の協調送信セルの端末固有の参照信号を時分割で配置することで、ダウンリンクデータの送信に用いるリソースエレメント数の減少を低減する。この場合、1つの協調送信セルの端末固有の参照信号の時間軸方向の数が減少するために、端末装置が高速で移動する場合には復調特性が劣化するのであるが、高速で移動する端末装置は複数の基地局装置から安定して信号を受信できる位置にとどまり続けることはなく、協調受信の対象となりづらいので問題はない。
図9は本発明の第4の実施の形態である、協調受信する手法を、複数端末複数入力複数出力方式(MU-MIMO)とした通信システムを表す一例である。本実施形態においては参照信号は端末固有の参照信号ではなく、セル固有参照信号を用いる。図10は協調受信を行なう場合の端末固有の参照信号のリソースブロック内での配置位置の一例を表す図である。各基地局装置から送信される共通参照信号RS0~RS3を使用し、都合12種の共通参照信号を使用する。図10における「R0-2」などの添え字の“-”の次に記載の数字は、共通参照信号RS0~RS3を送信する基地局装置を意味し、“-1”は基地局装置BS100から送信された共通参照信号、“-2”は基地局装置BS200から送信された共通参照信号、“-3”は基地局装置BS300から送信された共通参照信号を意味する。端末装置UE100は、BS100を主たる基地局装置とし、協調送信を行っているBS200およびBS300とからの信号の同時受信も行い、協調受信を行っている。端末装置UE103も同様にして協調受信を行なっている。
図12は本発明の第5の実施の形態である、協調受信する手法に、到来方向推定を用いた通信システムを表す一例である。BS100は重み付け係数の選択に、バックハウルを通じて知らされる端末装置が存在する主送信セルの方向ではなく、端末信号からの上り送信信号の到来角度に基づいて決定した基地局装置を用いる。図12に示すように、基地局装置BS200と端末装置UE100との通信が反射パスを主とする経路で行なわれる場合等、基地局装置BS200から見て必ずしも主送信セルの方向に協調受信を行なう端末が存在するとは限らない。本実施形態においては、上り送信信号の到来角度より適切に重み係数を選択し、ビームを形成できるので、反射パスなどのようにビーム方向が基地局装置の方向と異なる場合でも協調受信が可能となる。
図13は本発明の第6の実施の形態である、協調受信を特定の周波数帯域のみで行うものとした通信システムを表す一例である。図13では、全システム周波数帯域のなかで、セル間における協調受信に用いる周波数帯域をサブバンド1~3として固定している。サブバンド1は基地局装置BS100において使用する周波数帯域、サブバンド2は基地局装置BS200において使用する周波数帯域、サブバンド3は基地局装置BS300において使用する周波数帯域である。このように、協調受信を行う周波数帯域を、協調受信を行うセル間により固有のものとすることにより、セル間における協調受信用信号同士の干渉を防ぐことができる。
図14は本発明の第7の実施の形態である、協調受信を特定の時間帯域でのみで行うものとした通信システムを表す一例である。図14では、セル間における協調受信に用いる時間帯域をサブフレーム1~3として周期的に設ける。サブフレーム1は基地局装置BS100において使用する時間帯域、サブフレーム2は基地局装置BS200において使用する時間帯域、サブバンド3は基地局装置BS300において使用する時間帯域である。このように、協調受信を行う時間帯域を、協調受信を行うセル間により固有のものとすることにより、セル間における協調受信用信号同士の干渉を防ぐことができる。
図15は本発明の実施形態において使用される基地局装置の送信装置の構成の一例を表す機能ブロック図である。
尚、実際のOFDM送信部の数及び構成は基地局装置により異なる。
図16は、本発明の実施形態において使用される端末装置の受信装置の構成の一例を表す機能ブロック図である。図16に示すように、本実施の形態による受信装置31は、アンテナ32と、受信RF部33と、A/D部34と、CP除去部35と、FFT部36と、多重分離部37と、伝搬路推定部38と、伝搬路補償部39と、多重モード復元部40と、データ復調部41と、ターボ復号部42と、伝搬路補償部43と、多重モード復元部44と、QPSK復調部45と、畳込み復号部46と、制御部47と、重みモード決定部48と、を具備する。
UE100、UE101、UE200~UE205、UE300~UE305 端末装置
1 送信装置
3 データ信号処理部
4 ターボ符号部
5 データ変調部
6 プリコーディング部
7 重み付け部
8 制御信号処理部
9 畳込み符号部
10 QPSK変調部
11 プリコーディング部
12 重み付け部
13 参照信号発生部
14 参照信号識別符号決定部
15 制御部
16 多重・マッピング部
17 IFFT部
18 CP挿入部
19 移相部
20 D/A部
21 送信RF部
22 送信アンテナ
31 受信装置
32 受信アンテナ
33 受信RF部
34 A/D部
35 CP除去部
36 FFT部
37 多重分離部
38 伝搬路推定部
39 伝搬路補償部
40 多重モード復元部
41 データ復調部
42 ターボ復号部
43 伝搬路補償部
44 多重モード復元部
45 QPSK復調部
46 畳込み復号部
47 制御部
48 重みモード決定部
Claims (18)
- 通信対象の端末装置がセル内に存在すれば通常の主送信を行い、通信対象の端末装置が他のセル内に存在する場合は協調送信を行うことが可能な基地局装置において、
前記端末装置に固有の参照信号の識別符号を決定する参照信号識別符号決定手段と、
決定された前記識別符号に基づいて前記参照信号を生成する参照信号発生手段と、
前記参照信号含む信号を送信する送信手段と、
を備え、
前記参照信号発生手段は、通信対象の前記端末装置が協調送信セル内に存在する場合に用いる協調送信用参照信号が、主送信を行う基地局装置が用いる主送信用の参照信号とは異なるように生成し、
前記送信手段は前記端末に生成した協調送信用参照信号を送信することを特徴とする基地局装置。 - 前記参照信号識別符号決定手段は、
協調送信用参照信号の識別符号を、通信対象の前記端末装置と主送信を行う基地局装置の主送信用参照信号の識別符号とは異なる変数を用いて生成することを特徴とする請求項1に記載の基地局装置。 - 前記参照信号識別符号決定手段は、
協調送信用参照信号の識別符号を、主送信セルの基地局装置が用いるセル識別符号と、主送信セルの基地局装置が前記端末装置に割り当てたセル内端末識別子に演算を施した値と、を変数とする演算により生成することを特徴とする請求項2に記載の基地局装置。 - 前記参照信号識別符号決定手段は、
主送信セルの基地局装置が前記端末装置に割り当てたセル内端末識別子の値と、主送信セルの基地局装置が前記端末装置に割り当てたセル内端末識別子に一定の演算を施した値との差分を求め、
前記送信手段により前記端末装置に前記差分を送信することを特徴とする請求項3に記載の基地局装置。 - 前記参照信号識別符号決定手段は、
協調送信用参照信号の識別符号を生成する変数として、協調送信セルのセル識別子を用いることを特徴とする請求項2に記載の基地局装置。 - 前記参照信号識別符号決定手段は、
協調送信用参照信号の識別符号を生成する変数として、通信対象の端末装置にとって主送信セルのセル識別子と異なるセル識別子と、主送信セルの基地局装置が該端末装置に割り当てたセル内端末識別子とを用いることを特徴とする請求項2に記載の基地局装置。 - 前記参照信号識別符号決定手段は、
協調送信用参照信号の識別符号を生成する変数として、通信対象の端末装置に対する接続端末制限セルのセル識別子と、主送信セルの基地局装置が該端末装置に割り当てたセル内端末識別子のうちの一部のセル内端末識別子とを用いることを特徴とする請求項2に記載の基地局装置。 - 主送信セルの基地局装置が存在する方向のビームを形成する重み付け係数を決定する重み付け手段をさらに備え、
前記送信手段により前記重み付け係数を送信するビームフォーミング方式を用いることを特徴とする請求項1乃至7のいずれかに記載の基地局装置。 - 各基地局装置から送信されたセル固有の共通参照信号に基づき、基地局装置からの信号に対する重み付け係数を決定する重み付け手段をさらに備え、
主送信セルの基地局装置が前記重み付け手段により決定した重み付け係数を前記送信手段により前記端末装置に送信する複数端末複数入力複数出力方式を用いることを特徴とする請求項1乃至7のいずれかに記載の基地局装置。 - 前記端末装置からの信号の到来方向を推定する手段を備え、
前記重み付け手段は、重み付け係数を決定することを特徴とする請求項8または9に記載の基地局装置。 - 前記参照信号発生手段は、
協調送信用参照信号のリソースブロック内への配置を、主送信用参照信号の配置と異なるものとすることを特徴とする請求項1乃至10のいずれかに記載の基地局装置。 - 前記参照信号発生手段は、
協調送信用参照信号のリソースブロック内への配置を、前記主送信セルの参照信号と、前記協調送信セルの参照信号とを時分割で行うことを特徴とする請求項11に記載の基地局装置。 - 前記参照信号発生手段は、
協調送信用参照信号のリソースブロック内への配置を、主送信用参照信号の配置と異なるものし、前記共通参照信号の配置位置が重複する場合においては、重複する協調送信セルの参照信号を配置を他の送信シンボルへ配置し、かつ一部の送信シンボルにおける参照信号については送信を行わないことを特徴とする請求項9に記載の基地局装置。 - 前記送信手段は、協調送信を特定の周波数帯域でのみ行なうことを特徴とする請求項1乃至13のいずれかに記載の基地局装置。
- 前記送信手段は、協調送信を特定の時間帯域でのみ行なうことを特徴とする請求項1乃至13のいずれかに記載の基地局装置。
- 複数の基地局装置からの信号を同時に受信し、協調受信を行うことが可能な端末装置において、
請求項1乃至15のいずれかに記載の基地局装置からの信号を同時に受信する手段と、
受信した参照信号に基づいて伝搬路変動を推定して伝搬路変動補償値を求める伝搬路推定手段と、
前記伝搬路変動補償値に基づいて各基地局装置からの信号の伝搬路変動の補償を行う伝搬路補償手段と、
を備えることを特徴とする端末装置。 - 請求項1乃至15のいずれかに記載の基地局装置と、請求項16に記載の端末装置とから構成され、
前記端末装置は複数の前記基地局装置からの信号を同時に協調受信することを特徴とする無線通信システム。 - 通信対象の端末装置がセル内に存在すれば通常の主送信を行い、通信対象の端末装置が他のセル内に存在する場合は協調送信を行うことが可能な基地局装置に読み込ませて実行させるためのプログラムにおいて、
前記基地局装置に、
前記端末装置に固有の参照信号の識別符号を決定する参照信号識別符号決定手段と、
決定された前記識別符号に基づいて前記参照信号を生成する参照信号発生手段と、
として機能させ、
前記参照信号発生手段は、通信対象の前記端末装置が協調送信セル内に存在する場合に用いる協調送信用参照信号が、主送信を行う基地局装置が用いる主送信用の参照信号とは異なるように生成し、
送信手段により前記端末装置に参照信号を送信させることを実行させることを特徴とするプログラム。
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Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011135614A1 (ja) * | 2010-04-27 | 2011-11-03 | 富士通株式会社 | 無線通信方法、無線基地局、移動端末、無線通信システム |
WO2011155255A1 (ja) * | 2010-06-08 | 2011-12-15 | 三菱電機株式会社 | 無線通信システム |
JP2012019348A (ja) * | 2010-07-07 | 2012-01-26 | Toshiba Corp | 無線基地局装置、ベースバンド装置及び無線端末 |
WO2012060279A1 (ja) * | 2010-11-05 | 2012-05-10 | 株式会社日立製作所 | 無線通信システム、基地局及び無線通信方法 |
WO2012103946A1 (en) * | 2011-02-02 | 2012-08-09 | Fujitsu Limited | Wireless communication with co-operating cells |
WO2012108349A1 (ja) * | 2011-02-10 | 2012-08-16 | シャープ株式会社 | 基地局装置、移動局装置、通信システム、送信方法、受信方法および通信方法 |
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WO2012147601A1 (ja) * | 2011-04-27 | 2012-11-01 | シャープ株式会社 | 端末、基地局、通信システム、および通信方法 |
WO2013046471A1 (ja) * | 2011-09-30 | 2013-04-04 | 富士通株式会社 | 無線通信システム、基地局、移動局及び無線通信方法 |
JP2013521740A (ja) * | 2010-03-24 | 2013-06-10 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおいてセル間干渉低減方法及び装置 |
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JP2014187540A (ja) * | 2013-03-22 | 2014-10-02 | Toshiba Corp | 無線通信装置、無線通信システム、およびアクセスポイントの選択方法 |
US8886190B2 (en) | 2010-10-08 | 2014-11-11 | Qualcomm Incorporated | Method and apparatus for measuring cells in the presence of interference |
US8942192B2 (en) | 2009-09-15 | 2015-01-27 | Qualcomm Incorporated | Methods and apparatus for subframe interlacing in heterogeneous networks |
WO2015064474A1 (ja) * | 2013-10-29 | 2015-05-07 | 京セラ株式会社 | 通信制御方法、基地局、及びユーザ端末 |
US9106378B2 (en) | 2009-06-10 | 2015-08-11 | Qualcomm Incorporated | Systems, apparatus and methods for communicating downlink information |
US9125072B2 (en) | 2010-04-13 | 2015-09-01 | Qualcomm Incorporated | Heterogeneous network (HetNet) user equipment (UE) radio resource management (RRM) measurements |
US9144037B2 (en) | 2009-08-11 | 2015-09-22 | Qualcomm Incorporated | Interference mitigation by puncturing transmission of interfering cells |
US9226288B2 (en) | 2010-04-13 | 2015-12-29 | Qualcomm Incorporated | Method and apparatus for supporting communications in a heterogeneous network |
US9271167B2 (en) | 2010-04-13 | 2016-02-23 | Qualcomm Incorporated | Determination of radio link failure with enhanced interference coordination and cancellation |
US9277566B2 (en) | 2009-09-14 | 2016-03-01 | Qualcomm Incorporated | Cross-subframe control channel design |
JP2016506690A (ja) * | 2013-01-09 | 2016-03-03 | サムスン エレクトロニクス カンパニー リミテッド | eノードB間のCOMPをサポートする方法 |
US9325046B2 (en) | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
US9392608B2 (en) | 2010-04-13 | 2016-07-12 | Qualcomm Incorporated | Resource partitioning information for enhanced interference coordination |
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US10284315B2 (en) | 2016-03-24 | 2019-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Configuration and reporting of mobility measurements |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8326250B2 (en) * | 2008-05-22 | 2012-12-04 | Broadcom Corporation | Receiver with statistical analysis and methods for use therewith |
JP5310505B2 (ja) * | 2009-11-25 | 2013-10-09 | 富士通株式会社 | 無線通信方法、基地局および移動通信端末 |
US8395985B2 (en) | 2011-07-25 | 2013-03-12 | Ofinno Technologies, Llc | Time alignment in multicarrier OFDM network |
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KR101884332B1 (ko) * | 2011-09-14 | 2018-08-01 | 삼성전자주식회사 | 무선통신 시스템에서 가상 셀 형성 방법 및 장치 |
US9246558B2 (en) | 2011-09-26 | 2016-01-26 | Samsung Electronics Co., Ltd. | CoMP measurement system and method |
WO2013105820A1 (en) | 2012-01-11 | 2013-07-18 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting/receiving downlink data channel signal transmission information in cellular radio communication system using cooperative multi-point scheme |
US9161322B2 (en) | 2012-01-25 | 2015-10-13 | Ofinno Technologies, Llc | Configuring base station and wireless device carrier groups |
US8526389B2 (en) | 2012-01-25 | 2013-09-03 | Ofinno Technologies, Llc | Power scaling in multicarrier wireless device |
US9237537B2 (en) | 2012-01-25 | 2016-01-12 | Ofinno Technologies, Llc | Random access process in a multicarrier base station and wireless device |
US8964683B2 (en) | 2012-04-20 | 2015-02-24 | Ofinno Technologies, Llc | Sounding signal in a multicarrier wireless device |
SG11201405168VA (en) * | 2012-03-02 | 2014-11-27 | Nec Corp | Mobile station device, wireless communication system, channel estimation method, and program for controlling same |
US9084270B2 (en) | 2012-04-01 | 2015-07-14 | Ofinno Technologies, Llc | Radio access for a wireless device and base station |
US11943813B2 (en) | 2012-04-01 | 2024-03-26 | Comcast Cable Communications, Llc | Cell grouping for wireless communications |
US11582704B2 (en) | 2012-04-16 | 2023-02-14 | Comcast Cable Communications, Llc | Signal transmission power adjustment in a wireless device |
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US8964593B2 (en) | 2012-04-16 | 2015-02-24 | Ofinno Technologies, Llc | Wireless device transmission power |
US11825419B2 (en) | 2012-04-16 | 2023-11-21 | Comcast Cable Communications, Llc | Cell timing in a wireless device and base station |
US8958342B2 (en) | 2012-04-17 | 2015-02-17 | Ofinno Technologies, Llc | Uplink transmission power in a multicarrier wireless device |
US11252679B2 (en) | 2012-04-16 | 2022-02-15 | Comcast Cable Communications, Llc | Signal transmission power adjustment in a wireless device |
US11882560B2 (en) | 2012-06-18 | 2024-01-23 | Comcast Cable Communications, Llc | Carrier grouping in multicarrier wireless networks |
US9107206B2 (en) | 2012-06-18 | 2015-08-11 | Ofinne Technologies, LLC | Carrier grouping in multicarrier wireless networks |
US9084228B2 (en) | 2012-06-20 | 2015-07-14 | Ofinno Technologies, Llc | Automobile communication device |
US11622372B2 (en) | 2012-06-18 | 2023-04-04 | Comcast Cable Communications, Llc | Communication device |
KR102019918B1 (ko) | 2012-07-27 | 2019-09-09 | 삼성전자 주식회사 | 무선 통신 시스템에서 기지국간 협력통신을 위한 자원할당 방법 및 장치 |
JP2014030132A (ja) * | 2012-07-31 | 2014-02-13 | Ntt Docomo Inc | 通信システム、基地局装置、移動端末装置及び通信方法 |
US9008222B2 (en) | 2012-08-14 | 2015-04-14 | Samsung Electronics Co., Ltd. | Multi-user and single user MIMO for communication systems using hybrid beam forming |
US20150351063A1 (en) * | 2012-10-12 | 2015-12-03 | Broadcom Corporation | Sch-linked rs configurations for new carrier type |
CN103812546B (zh) * | 2012-11-07 | 2017-08-25 | 华为技术有限公司 | 一种基于天线阵列的参考信号映射方法、装置及系统 |
JP5738338B2 (ja) * | 2013-03-29 | 2015-06-24 | 株式会社Nttドコモ | 無線通信システムおよび無線基地局装置 |
KR20150025630A (ko) * | 2013-08-29 | 2015-03-11 | 한국전자통신연구원 | Lte기반 통신시스템에서 빔 형성 방법 및 자원 할당 방법 |
JP2015076700A (ja) * | 2013-10-08 | 2015-04-20 | 株式会社Nttドコモ | 無線装置、無線制御装置及び通信制御方法 |
CN106538006B (zh) * | 2014-07-18 | 2020-03-10 | 华为技术有限公司 | 用户装置、网络节点及其方法 |
US10254724B2 (en) | 2014-10-31 | 2019-04-09 | Samsung Electronics Co., Ltd. | Method and system for personalized, secure, and intuitive smart home control using a smart hand |
EP3408945A1 (en) | 2016-01-27 | 2018-12-05 | Starry, Inc. | High frequency wireless access network |
JP2017169127A (ja) * | 2016-03-17 | 2017-09-21 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカPanasonic Intellectual Property Corporation of America | 通信システム、通信システムの制御方法、基地局装置、および無線端末装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007116686A (ja) * | 2005-10-18 | 2007-05-10 | Alcatel | 分散基地局、通信システム、ならびにその基地局およびシステムの信号伝送方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8602033A (nl) * | 1986-08-08 | 1988-03-01 | Nedap Nv | Precisie richtfunctie bij herkensysteem. |
US6389010B1 (en) * | 1995-10-05 | 2002-05-14 | Intermec Ip Corp. | Hierarchical data collection network supporting packetized voice communications among wireless terminals and telephones |
US5745532A (en) * | 1992-03-12 | 1998-04-28 | Ntp Incorporated | System for wireless transmission and receiving of information and method of operation thereof |
DE69939875D1 (de) * | 1998-09-03 | 2008-12-18 | Wherenet Inc | Mehrfach laterales netz mit zirkularpolarisierter antenne |
AU2001243424A1 (en) * | 2000-02-29 | 2001-09-12 | Hrl Laboratories, Llc | Cooperative mobile antenna system |
CN101043704A (zh) * | 2006-03-20 | 2007-09-26 | 华为技术有限公司 | 一种更新用户设备位置信息的方法、网络及装置 |
CN101227242B (zh) | 2008-01-31 | 2011-06-01 | 西安交通大学 | 一种基于通道校正的分布式天线阵列波束形成方法 |
-
2009
- 2009-09-17 CN CN200980137214.0A patent/CN102160442B/zh not_active Expired - Fee Related
- 2009-09-17 EP EP09814635.0A patent/EP2343942B1/en not_active Not-in-force
- 2009-09-17 WO PCT/JP2009/066271 patent/WO2010032791A1/ja active Application Filing
- 2009-09-17 US US13/119,998 patent/US8521215B2/en active Active
- 2009-09-17 JP JP2010529791A patent/JP5410437B2/ja not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007116686A (ja) * | 2005-10-18 | 2007-05-10 | Alcatel | 分散基地局、通信システム、ならびにその基地局およびシステムの信号伝送方法 |
Non-Patent Citations (8)
Title |
---|
"3GPP TSG RAN WG1 Meeting #53bis", 30 June 2008, NTT DOCOMO, INC., article "Proposals for LTE-Advanced Technologies" |
"A discussion on some technology components for LTE-Advanced", 3GPP TSG RAN WG1 #53, KANSAS CITY, USA, 5 May 2008 (2008-05-05) |
"Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation(Release 8", 3GPP TS 36.211, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Specs/html-info/36211.htm> |
HUAWEI: "Physical layer technologyies for LTE-Advanced", 3GPP TSG RAN WG1#53, RL-081838, 9 May 2008 (2008-05-09), pages 3 - 7, XP050110210 * |
NOBUYOSHI KIKUMA, ADAPTIVE ANTENNA TECHNOLOGY, 10 October 2003 (2003-10-10), pages 11 - 15 |
See also references of EP2343942A4 |
YONGMING LIANG: "DOA Based Open-Loop Scheme for Precoding MIMO Systems", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, COMMUTATION THESIS COLLECTION 1 OF 2008 IEICE SOCIETY CONFERENCE, pages: S53 - S54 |
YOSHIO KARASAWA: "MIMO fushigi tanken (MIMO mysterious exploration", DENKO TECHNICAL PAPER, 2006, pages II - IX |
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US9144037B2 (en) | 2009-08-11 | 2015-09-22 | Qualcomm Incorporated | Interference mitigation by puncturing transmission of interfering cells |
US9277566B2 (en) | 2009-09-14 | 2016-03-01 | Qualcomm Incorporated | Cross-subframe control channel design |
US11357035B2 (en) | 2009-09-14 | 2022-06-07 | Qualcomm Incorporated | Cross-subframe control channel design |
US10142984B2 (en) | 2009-09-15 | 2018-11-27 | Qualcomm Incorporated | Methods and apparatus for subframe interlacing in heterogeneous networks |
US9281932B2 (en) | 2009-09-15 | 2016-03-08 | Qualcomm Incorporated | Methods and apparatus for subframe interlacing in heterogeneous networks |
US8942192B2 (en) | 2009-09-15 | 2015-01-27 | Qualcomm Incorporated | Methods and apparatus for subframe interlacing in heterogeneous networks |
US8965294B2 (en) | 2010-03-24 | 2015-02-24 | Lg Electronics Inc. | Method and apparatus for reducing inter-cell interference in radio communication system |
US10200176B2 (en) | 2010-03-24 | 2019-02-05 | Lg Electronics Inc. | Method and apparatus for reducing inter-cell interference in radio communication system |
US10652001B2 (en) | 2010-03-24 | 2020-05-12 | Lg Electronics Inc. | Method and apparatus for reducing inter-cell interference in radio communication system |
JP2013521740A (ja) * | 2010-03-24 | 2013-06-10 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおいてセル間干渉低減方法及び装置 |
US9667396B2 (en) | 2010-03-24 | 2017-05-30 | Lg Electronics Inc. | Method and apparatus for reducing inter-cell interference in radio communication system |
US9788316B2 (en) | 2010-03-29 | 2017-10-10 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
JP2013524616A (ja) * | 2010-03-29 | 2013-06-17 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおけるセル間干渉調整に対する測定方法及び装置 |
US9225450B2 (en) | 2010-03-29 | 2015-12-29 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
US9161236B2 (en) | 2010-03-29 | 2015-10-13 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
US9392608B2 (en) | 2010-04-13 | 2016-07-12 | Qualcomm Incorporated | Resource partitioning information for enhanced interference coordination |
US9282472B2 (en) | 2010-04-13 | 2016-03-08 | Qualcomm Incorporated | Heterogeneous network (HETNET) user equipment (UE) radio resource management (RRM) measurements |
US9125072B2 (en) | 2010-04-13 | 2015-09-01 | Qualcomm Incorporated | Heterogeneous network (HetNet) user equipment (UE) radio resource management (RRM) measurements |
US9226288B2 (en) | 2010-04-13 | 2015-12-29 | Qualcomm Incorporated | Method and apparatus for supporting communications in a heterogeneous network |
US9801189B2 (en) | 2010-04-13 | 2017-10-24 | Qualcomm Incorporated | Resource partitioning information for enhanced interference coordination |
US9271167B2 (en) | 2010-04-13 | 2016-02-23 | Qualcomm Incorporated | Determination of radio link failure with enhanced interference coordination and cancellation |
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US9730212B2 (en) | 2010-04-27 | 2017-08-08 | Fujitsu Limited | Method for wireless communication, wireless station, mobile terminal, and wireless communication system |
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WO2011155255A1 (ja) * | 2010-06-08 | 2011-12-15 | 三菱電機株式会社 | 無線通信システム |
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JP2013534778A (ja) * | 2010-06-23 | 2013-09-05 | クゥアルコム・インコーポレイテッド | Lte−aのためのヘテロジニアスなネットワークにおける制御/データ分割スキームの方法 |
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JP2012019348A (ja) * | 2010-07-07 | 2012-01-26 | Toshiba Corp | 無線基地局装置、ベースバンド装置及び無線端末 |
US8886190B2 (en) | 2010-10-08 | 2014-11-11 | Qualcomm Incorporated | Method and apparatus for measuring cells in the presence of interference |
JP5512822B2 (ja) * | 2010-11-05 | 2014-06-04 | 株式会社日立製作所 | 無線通信システム、基地局及び無線通信方法 |
US9203575B2 (en) | 2010-11-05 | 2015-12-01 | Hitachi, Ltd. | Wireless communication system, base station, and wireless communication method |
WO2012060279A1 (ja) * | 2010-11-05 | 2012-05-10 | 株式会社日立製作所 | 無線通信システム、基地局及び無線通信方法 |
JP2014112976A (ja) * | 2010-11-05 | 2014-06-19 | Hitachi Ltd | 無線通信システム、基地局及び無線通信方法 |
JP2014507895A (ja) * | 2011-02-02 | 2014-03-27 | 富士通株式会社 | 協調セルを有する無線通信 |
US9801168B2 (en) | 2011-02-02 | 2017-10-24 | Fujitsu Limited | Wireless communication with co-operating cells |
WO2012103946A1 (en) * | 2011-02-02 | 2012-08-09 | Fujitsu Limited | Wireless communication with co-operating cells |
KR101509367B1 (ko) * | 2011-02-02 | 2015-04-07 | 후지쯔 가부시끼가이샤 | 협력 셀과의 무선 통신 |
CN103339871A (zh) * | 2011-02-02 | 2013-10-02 | 富士通株式会社 | 利用协作小区的无线通信 |
JP2012169738A (ja) * | 2011-02-10 | 2012-09-06 | Sharp Corp | 基地局装置、移動局装置、通信システム、送信方法、受信方法および通信方法 |
TWI473475B (zh) * | 2011-02-10 | 2015-02-11 | Sharp Kk | A base station apparatus, a mobile station apparatus, a transmission method, a receiving method, and an integrated circuit |
EA027257B1 (ru) * | 2011-02-10 | 2017-07-31 | Шарп Кабусики Кайся | Базовая станция, мобильная станция, система связи, способ передачи, способ приема и способ связи |
WO2012108349A1 (ja) * | 2011-02-10 | 2012-08-16 | シャープ株式会社 | 基地局装置、移動局装置、通信システム、送信方法、受信方法および通信方法 |
US9713123B2 (en) | 2011-02-10 | 2017-07-18 | Sharp Kabushiki Kaisha | Base station device, mobile station device, communication system, transmission method, reception method, and communication method |
JP2012195827A (ja) * | 2011-03-17 | 2012-10-11 | Softbank Mobile Corp | 移動通信システム、基地局装置及び移動局装置 |
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JP2014514849A (ja) * | 2011-04-14 | 2014-06-19 | ノキア シーメンス ネットワークス オサケユキチュア | 単一キャリアセルアグリゲーションでの協調送信CoMP |
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US10033503B2 (en) | 2011-05-03 | 2018-07-24 | Nokia Solutions And Networks Oy | Methods and devices for dynamic allocation of identifiers in hybrid cell identifier scenarios |
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US9461791B2 (en) | 2012-01-19 | 2016-10-04 | Kyocera Corporation | Mobile communication system, base station and communication control method for adding base station to CoMP cooperating set |
WO2013108904A1 (ja) * | 2012-01-19 | 2013-07-25 | 京セラ株式会社 | 移動通信システム、基地局、及び通信制御方法 |
JPWO2013108904A1 (ja) * | 2012-01-19 | 2015-05-11 | 京セラ株式会社 | 移動通信システム、基地局、及び通信制御方法 |
US9325046B2 (en) | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
JP2016506690A (ja) * | 2013-01-09 | 2016-03-03 | サムスン エレクトロニクス カンパニー リミテッド | eノードB間のCOMPをサポートする方法 |
US9923684B2 (en) | 2013-01-09 | 2018-03-20 | Samsung Electronics Co., Ltd. | Methods to support inter-eNodeB CoMP |
JP2014187540A (ja) * | 2013-03-22 | 2014-10-02 | Toshiba Corp | 無線通信装置、無線通信システム、およびアクセスポイントの選択方法 |
US10070446B2 (en) | 2013-10-29 | 2018-09-04 | Kyocera Corporation | Communication control method, base station, and user terminal |
JPWO2015064474A1 (ja) * | 2013-10-29 | 2017-03-09 | 京セラ株式会社 | 通信制御方法、基地局、及びユーザ端末 |
WO2015064474A1 (ja) * | 2013-10-29 | 2015-05-07 | 京セラ株式会社 | 通信制御方法、基地局、及びユーザ端末 |
JP2018503297A (ja) * | 2014-12-17 | 2018-02-01 | テレフオンアクチーボラゲット エルエム エリクソン(パブル) | モビリティ信号を送信するための方法並びに関連するネットワーク・ノード及び無線デバイス |
CN107005377A (zh) * | 2014-12-17 | 2017-08-01 | 瑞典爱立信有限公司 | 用于发送移动性信号的方法和相关网络节点及无线设备 |
US10165456B2 (en) | 2014-12-17 | 2018-12-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods for transmitting mobility signals and related network nodes and wireless devices |
CN107005377B (zh) * | 2014-12-17 | 2020-11-10 | 瑞典爱立信有限公司 | 用于发送移动性信号的方法和相关网络节点及无线设备 |
US10284315B2 (en) | 2016-03-24 | 2019-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Configuration and reporting of mobility measurements |
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US20110218016A1 (en) | 2011-09-08 |
US8521215B2 (en) | 2013-08-27 |
JP5410437B2 (ja) | 2014-02-05 |
EP2343942A4 (en) | 2014-07-23 |
EP2343942B1 (en) | 2016-11-23 |
CN102160442A (zh) | 2011-08-17 |
EP2343942A1 (en) | 2011-07-13 |
JPWO2010032791A1 (ja) | 2012-02-09 |
CN102160442B (zh) | 2014-07-16 |
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