WO2017073711A1 - 無線装置、制御装置および無線通信システム - Google Patents
無線装置、制御装置および無線通信システム Download PDFInfo
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- WO2017073711A1 WO2017073711A1 PCT/JP2016/081996 JP2016081996W WO2017073711A1 WO 2017073711 A1 WO2017073711 A1 WO 2017073711A1 JP 2016081996 W JP2016081996 W JP 2016081996W WO 2017073711 A1 WO2017073711 A1 WO 2017073711A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
Definitions
- the present invention is based on a Japanese patent application: Japanese Patent Application No. 2015-212520 (filed on Oct. 29, 2015), and the entire description of the application is incorporated herein by reference.
- the present invention relates to a radio apparatus, a control apparatus, and a radio communication system in a radio communication system configuration in which a function of a radio base station is divided into a radio apparatus and a control apparatus.
- Non-Patent Document 1 describes a method of estimating channel capacity for each terminal combination candidate using the channel response of each terminal, and selecting a terminal combination that maximizes the channel capacity as a terminal to be multiplexed. Yes.
- the scheduling method of MU-MIMO is scheduling of only the spatial axis (MIMO multi-layer), and it is assumed that one carrier is assumed on the frequency axis, and signal power based on the projection channel power of each user is assumed. Because it is a reference, there is a problem that interference power is not considered. Therefore, in Patent Document 1, RB (Resource Block) frequency-divided in a system band is used as a MU-MIMO scheduling method that is consistent with a frequency scheduling method using received SINR (Signal-to-Interference-plus Noise-power Ratio). A scheduling method is described in which reception quality (SINR) expressed in two dimensions of a frequency axis and a space axis is considered at the same time and assigned to an optimal user.
- SINR Signal-to-Interference-plus Noise-power Ratio
- Non-Patent Document 2 discusses a C-RAN (Cloud / Centralized Radio Access Access Network) configuration that efficiently operates small cells.
- C-RAN the baseband processing function of a small cell is divided into a radio device on the antenna side and a control device on the core network side, and the control device aggregates some of the baseband processing functions of multiple small cells. It is done.
- Non-Patent Document 2 describes a plurality of types of C-RAN configurations according to the division method of the baseband processing function, and transmission required for the transmission path (fronthaul) between the wireless device and the control device is described for each configuration. It describes the capacity and ease of cooperative control between cells.
- An object of the present invention is to provide a radio apparatus, a control apparatus, and a radio communication system that solve the problem that the application effect of MU-MIMO transmission cannot be sufficiently obtained in a C-RAN configuration.
- the radio apparatus includes a channel response estimation unit that estimates a channel response between the radio terminal and the own apparatus.
- the wireless device includes a propagation path information generation unit that generates propagation path information from the estimated propagation path response.
- the wireless device includes a transmission unit that transmits the generated propagation path information to the control device.
- the control apparatus includes a receiving unit that receives the propagation path information generated by the wireless apparatus based on the estimated propagation path response between the wireless terminal and the wireless apparatus.
- the control device includes a scheduling unit that generates scheduling information from the propagation path information.
- the control device includes a transmission unit that transmits the scheduling information to the wireless device.
- the wireless communication system includes a wireless device and a control device.
- the radio apparatus includes a channel response estimation unit that estimates a channel response between a radio terminal and the radio apparatus.
- the wireless device includes a propagation path information generation unit that generates propagation path information from the propagation path response. Further, the wireless device includes a transmission unit that transmits the propagation path information to the control device.
- the control device includes a scheduling unit that generates scheduling information from the propagation path information. In addition, the control device includes a transmission unit that transmits the scheduling information to the wireless device.
- the network capacity of the wireless system is expanded.
- MU-MIMO transmission in order to operate a small cell with a narrow cell coverage range, when a C-RAN configuration is employed in which the radio apparatus and the control apparatus are physically separated, the radio apparatus transmits the estimated propagation path state to the control apparatus. There is no means for notification, and scheduling by the control apparatus is not suitable for obtaining the application effect of MU-MIMO transmission.
- FIG. 15 is a block diagram illustrating the configuration of a wireless communication system according to an embodiment.
- the wireless communication system includes a wireless device 3 and a control device 200.
- the wireless device 3 includes a propagation path response estimation unit 327 that estimates a propagation path response between the wireless terminal 4 and the own device 3, a propagation path information generation unit 33 that generates propagation path information from the estimated propagation path response, And a transmission unit 34 that transmits the generated propagation path information to the control device 200.
- the control device 200 receives the propagation path information generated by the wireless device 3 based on the estimated propagation path response between the wireless terminal 4 and the wireless device 3, and the scheduling information from the propagation path information. And a transmission unit 23 that transmits the scheduling information to the wireless device 3.
- the wireless device 3 estimates a channel response with the wireless terminal 4 based on a reference signal (SRS: Sounding Reference Signal) from the wireless terminal 4.
- a scheduling unit 214 includes a channel response estimation unit 327 and a transmission unit 34 that transmits the estimated channel information to the control device 200, and performs scheduling using the channel information received from the wireless device 3 in the control device 200. It has.
- the wireless device 3 when MU-MIMO transmission is used in the C-RAN configuration, the wireless device 3 includes the propagation path response estimation unit 327, and the control device 200 performs scheduling using the propagation path response estimation received from the wireless device 3. It is configured to do. Therefore, when MU-MIMO transmission is used in a C-RAN configuration, the problem that resources cannot be allocated in accordance with the state of the propagation path can be solved, and the network capacity of the wireless system can be expanded.
- the present invention is not limited to MU-MIMO transmission, and can be applied to other transmission methods.
- FIG. 1 is a block diagram illustrating a configuration of a wireless communication system according to the present embodiment.
- the wireless communication system includes a core network 100, a control device 200, a wireless device 300-1 (wireless device # 1), a wireless device 300-2 (wireless device # 2), a wireless terminal 400-1 (wireless terminal # 1), a wireless device Terminal 400-2 (wireless terminal # 2) and wireless terminal 400-3 (wireless terminal # 3) are provided.
- the wireless terminals 400-1, 400-2, and 400-3 are denoted as the wireless terminal 4 when the distinction is unnecessary.
- the wireless communication system illustrated in FIG. 1 includes two wireless devices 3, the number of wireless devices 3 is not limited to this. Similarly, the number of wireless terminals 4 is not limited.
- a wireless terminal is used here as an example, a wireless device having relay capability may be used.
- the control device 200 and the wireless device 3 are provided at physically separated positions, and are connected via the transmission path 30.
- the transmission path 30 is a medium used for information transmission such as an optical fiber, a metal cable, and a radio propagation path.
- the wireless device 3 and the wireless terminal 4 are connected via a wireless propagation path.
- the control device 200 includes a center radio signal processing unit 210 and a transmission path interface 220 (transmission path IF).
- the transmission path interface 220 performs processing corresponding to the standard of the transmission path 30 in order to communicate with the wireless device 3 via the transmission path 30.
- the wireless device 3 includes a transmission line interface 310 (transmission line IF (Interface)), a remote wireless signal processing unit 320, a wireless transmission / reception unit 330, and an antenna 340.
- transmission line interface 310 transmission line IF (Interface)
- remote wireless signal processing unit 320 remote wireless signal processing unit 320
- wireless transmission / reception unit 330 wireless transmission / reception unit 330
- antenna 340 antenna 340
- the wireless terminal 4 includes an antenna and a wireless transmission / reception unit.
- the remote radio signal processing unit 320 in this embodiment includes an FFT (Fast Fourier Transform) unit 326, a channel response estimation unit 327, an encoding unit 321, a modulation unit 322, an antenna mapping unit 323, resources A mapping unit 324 and an IFFT (Inverse Fourier Transform) unit 325 are provided.
- FFT Fast Fourier Transform
- the center radio signal processing unit 210 includes a scheduling unit 214, a PDCP (Packet Data Convergence Protocol) layer processing unit 211, an RLC (Radio Link Control) layer processing unit 212, and a MAC (Media Access Control) layer processing unit 213. Yes.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Media Access Control
- the wireless transmission / reception unit 330 of the wireless device 3 converts a wireless signal including a reference signal received from the wireless terminal via the antenna 340 into a baseband signal and outputs the baseband signal to the FFT unit 326.
- the FFT unit 326 performs fast Fourier transform (FFT: Fast Fourier Transform) on the baseband signal input from the wireless transmission / reception unit 330 and outputs the result to the channel response estimation unit 327.
- FFT fast Fourier transform
- a cyclic prefix (CP: Cyclic : Prefix) is removed between the FFT unit 326 and the wireless transmission / reception unit 330 (not shown).
- the propagation path response estimation unit 327 uses the signal input from the FFT unit 326 and the reference signal known on the wireless device 3 side transmitted from the wireless terminal 4, and the propagation path between the wireless terminal 4 and the wireless device 3. The response is estimated, and the estimated value is output to the scheduling unit 214 and the antenna mapping unit 323 of the center radio signal processing unit 210 via the transmission path interface 310, the transmission path 30, and the transmission path interface 220.
- the wireless terminal 4 for which the propagation path response is to be estimated is not limited to the wireless terminal that communicates with the wireless apparatus 3, and the propagation path response to the wireless terminal that communicates with another wireless apparatus may be estimated.
- the estimated value to be output may be averaged in the time direction or the frequency direction. Note that the terminal may estimate the propagation path response using the reference signal and transmit the propagation path response to the radio apparatus.
- the transmission path interface 310 performs processing corresponding to the standard of the transmission path 30 in order to communicate with the control device 200 via the transmission path 30.
- the scheduling unit 214 uses the channel response estimation value input from the channel response estimation unit 327 of the remote radio signal processing unit 320 to the radio terminal 4 for radio resources and modulation coding scheme (MCS: ModulationModCoding Scheme). And the allocation information is output to the RLC layer processing unit 212, the MAC layer processing unit 213, the encoding unit 321, the modulation unit 322, the antenna mapping unit 323, and the resource mapping unit 324.
- MCS ModulationModCoding Scheme
- the PDCP layer processing unit 211 performs processing such as compression and encryption on the user data sent from the core network 100 and outputs the processed data to the RLC layer processing unit 212.
- the RLC layer processing unit 212 buffers the data input from the PDCP layer processing unit 211, divides and combines the buffered data according to the request from the scheduling unit 214, and outputs the data to the MAC layer processing unit 213. .
- the MAC layer processing unit 213 multiplexes data, control information, and the like sent from the RLC layer processing unit 212 according to the request from the scheduling unit 214, and passes through the transmission path interface 220, the transmission path 30, and the transmission path interface 310.
- the data is output to the encoding unit 321 of the remote radio signal processing unit 320.
- the encoding unit 321 encodes the data input from the MAC layer processing unit 213 via the transmission path interface 220, the transmission path 30, and the transmission path interface 310 based on the information sent from the scheduling unit 214, and the modulation unit It outputs to 322.
- the modulation unit 322 converts the data input from the encoding unit 321 into a modulation signal based on the information sent from the scheduling unit 214, and outputs the modulated signal to the antenna mapping unit 323.
- the antenna mapping unit 323 uses the information input from the scheduling unit 214 and the channel response estimation value input from the channel response estimation unit 327 to calculate a weighting factor for multiplying the modulated signal.
- the antenna mapping unit 323 multiplies the modulation signal input from the modulation unit 322 by the calculated weighting factor, adds the spatially multiplexed signals after multiplication by the weighting factor, and outputs the result to the resource mapping unit 324.
- the resource mapping unit 324 maps the signal input from the antenna mapping unit 323 to a radio resource based on the information input from the scheduling unit 214, and outputs the radio resource to the IFFT unit 325.
- the IFFT unit 325 performs an inverse fast Fourier transform (IFFT) on the signal input from the resource mapping unit 324, and outputs the result to the radio transmission / reception unit 330.
- IFFT inverse fast Fourier transform
- a cyclic prefix (CP: Cyclic Prefix) is added between IFFT unit 325 and wireless transmission / reception unit 330 (not shown).
- the radio transmission / reception unit 330 converts the baseband signal transmitted from the IFFT unit 325 into a radio signal in the carrier frequency band, and transmits the radio signal via the antenna 340.
- the radio apparatus 3 in the present embodiment performs the following operations S101 to S110.
- the wireless device 3 transmits a reference signal request to the wireless terminal 4 (operation S101).
- the wireless device 3 receives the reference signal from the wireless terminal 4 (operation S102).
- the propagation channel response estimation unit 327 estimates the propagation channel response (transfer function or impulse response) between the wireless device 3 and the wireless terminal 4 (operation S103).
- the wireless device 3 sends the estimated value of the propagation path response to the control device 200 (operation S104).
- the estimated value of the channel response to be transmitted may not be for all estimated wireless terminals.
- the wireless terminal that is not the communication partner of the wireless device 3 may be limited to a wireless terminal having a large gain of the channel response.
- the control apparatus 200 may instruct the wireless terminal that should transmit the estimated value of the propagation path response, and may limit the wireless terminal that transmits the estimated value of the propagation path response based on the instruction.
- the scheduling unit 214 of the control device 200 performs radio resource allocation such as terminal combination, spatial multiplexing, and modulation and coding scheme using the estimated value of the channel response sent from the radio device 3 (operation S105).
- the center radio signal processing unit 210 of the control device 200 buffers data obtained by compressing and encrypting user data, and buffers the data in accordance with the request from the scheduling unit 214 based on the scheduling result of operation S105.
- the ringed data is divided and combined to generate transmission data (operation S106).
- the control device 200 sends the scheduling result of operation S105 (terminal combination, number of layers, MCS, etc.) to the wireless device 3 (operation S107). Further, the transmission data and control information generated in operation S106 are multiplexed in accordance with the request from the scheduling unit 214 and sent to the wireless apparatus 3 (operation S108).
- the remote radio signal processing unit 320 of the wireless device 3 Based on the scheduling information sent in operation S107, the remote radio signal processing unit 320 of the wireless device 3 performs encoding, modulation, weight generation, mapping, etc. on the transmission data sent in operation S108, A band signal is generated (operation S109).
- the wireless transmission / reception unit 330 of the wireless device 3 generates a wireless signal from the baseband signal generated in operation S109 and transmits it via the antenna 340 (operation S110).
- the scheduling unit 214 in the present embodiment first selects a wireless terminal for communication from a plurality of wireless terminals (operations S501 to S504). As shown in FIG. 5, selection of a terminal will be described.
- an RBG is selected from selectable RBGs (Resource Block Group) (operation S501).
- RBG Resource Block
- LTE Long Term Evolution
- 12 subcarriers (180 kHz) adjacent at 15 kHz intervals are divided into one block, which is called RB, but is not limited thereto.
- priority is calculated for all terminal combinations (operation S502).
- the correlation of the propagation path with the selected wireless terminal may be calculated, and the priority may be calculated only for some wireless terminals with low correlation.
- the selection frequency of each wireless terminal may be calculated, and the priority may be calculated only for some wireless terminals with a low selection frequency. A method for calculating the priority will be described later.
- the combination of terminals whose priority has reached the specified level is assigned to the selected RBG (operation S503).
- the term “reached” may be, for example, a terminal combination having the highest priority, or a combination having the maximum overall priority under the condition that each terminal satisfies the minimum rate. Further, it may be compared with a preset threshold value or the like.
- the number of layers is selected for each of the wireless terminals selected in operations S501 to S504 (operations S601 to S604).
- the number of layers means the number of modulated signals multiplied by different weighting coefficients in the antenna mapping 323, that is, the number of spatially multiplexed modulated signals.
- the number of layers is the same as the number of codewords as a unit of encoding. Note that the selection of the terminal and the selection of the number of layers may be performed simultaneously.
- a terminal assigned to a certain RBG is selected (operation S601).
- the priority is calculated for all the selectable layers (operation S602).
- the number of layers for which the calculated priority has reached the regulation is assigned to the selected terminal (operation S603).
- reaching the regulation may be, for example, the number of layers with the highest priority or the number of layers with the highest priority under the condition that each terminal satisfies the minimum rate. Moreover, you may compare with the threshold value etc. which were preset.
- the MCS corresponding to each layer of each terminal in each RBG is selected (operations S701 to S704).
- a certain layer is selected from each layer of a certain terminal set in a certain RBG (operation S701).
- the reception SINR in the selected layer is calculated (operation S702). However, it is not necessary to limit the SINR to be calculated to one, and the SINR may be calculated for each of a plurality of RBs included in the RBG. The SINR calculation method will be described later.
- MCS is selected based on the calculated SINR (operation S703).
- a SINR value that satisfies a predetermined quality (for example, a packet error rate of 0.1) is set for each MCS, and the maximum value is obtained under the condition that the calculated average SINR is larger than the SINR value that satisfies the predetermined quality. What is necessary is just to select MCS.
- an offset value may be added to the average SINR.
- the offset value may be a constant value, or may be sequentially changed according to the success or failure of communication, for example.
- a method using a value representing a priority order is generally used.
- a high priority indicates an optimal combination in the set.
- the priority M k is calculated, for example, according to the Max-C / I norm and PF (Proportional Fairness) norm.
- the received SINR is estimated for the wireless terminal included in the set U s (n) of the selected terminal and the wireless terminal with the terminal number k, and the estimated SINR is calculated based on the Shannon capacity theory.
- the instantaneous rate is converted by the equation, and the sum of the instantaneous rates is M k .
- radio resources are allocated at a ratio of instantaneous throughput to average throughput of a target mobile station.
- M k is not the sum of instantaneous rates but the sum of values obtained by dividing the instantaneous rate by the average rate.
- the calculation rule of M k may be changed for each stage. Further, in order to preferentially select a combination of terminals having low correlation, the reciprocal of the correlation value of the propagation path between terminals may be set to Mk .
- a transmission weight (Transmit Weight / Transmission Weight) (weight coefficient for multiplying a modulated signal) and a reception weight (weight coefficient for multiplying a received signal) using a channel response input from the wireless device 3 are used to estimate the SINR.
- SINR is estimated using a channel response vector for each layer generated by performing matrix calculation processing on the channel response input from the wireless device 3.
- the SINR is estimated using the correlation of the propagation path between terminals calculated from the propagation path response vector for each layer input from the wireless device 3. Each is expressed by the following equations (1), (3), and (6).
- N R is the number of antennas included in the wireless terminal 4
- N T ( ⁇ N R ) is the number of antennas included in the wireless device 3.
- H k be an N R ⁇ N T propagation path response matrix whose element is an estimated value of the propagation path response between the wireless apparatus 3 and the k-th wireless terminal, which is input from the wireless apparatus 3.
- the NT dimension transmission weight vector for the l-th layer of the k-th radio terminal be w Tx, k, l
- the N R- dimensional reception weight vector be w Rx, k, l
- the transmission power is P k, l
- the other cell interference power is ⁇ I 2 (k, l).
- the set of terminals selected by the wireless device is U s and the noise power is ⁇ n 2 .
- the received SINR ⁇ k, l of the l-th layer of the k-th wireless terminal is estimated by the following equation (1).
- H represents Hermitian transposition.
- the transmission weight vector w Tx, k, l is generated by the scheduling unit 214 using H k according to a predetermined standard.
- a predetermined standard For example, standards such as MRT (Maximum Ratio Transmission), ZF (Zero Forcing), and SLNR (Signal to Leakage plus Noise Ratio) are used.
- N R transmission weight vectors are included for each of K ′ radio terminals.
- the transmission weight vector w Tx, k, l of the l-th layer of the k-th wireless terminal is the product of the transmission weight vector and the channel response matrix H k among the transmission weight vectors of the k-th wireless terminal included in W Tx .
- the transmission weight vector having the lth largest magnitude may be selected.
- the reception weight vector w Rx, k, l is generated according to a predetermined standard using H k and w Tx, k, l .
- MRC Maximum Ratio Combining
- a method for calculating the parameters used in Expression (1) and the transmission power P k, l will be described.
- a method of assigning a value corresponding to the magnitude of the product with the response matrix is used.
- the first term of the denominator on the right side in Equation (1) is the interference power that the signal excluding the address of the k-th radio terminal addressed to the l-th layer gives to the k-th radio terminal.
- the magnitude of this interference power depends on the transmission weight vector generation criterion. For example, when generated according to the ZF standard, the interference power is 0, and the first term of the denominator on the right side can be ignored in the calculation of Expression (1).
- the received SINR ⁇ k, l of the l-th layer of the k-th radio terminal is estimated by the following equation (3) using the channel response vector g k, l of the l-th layer of the k-th radio terminal.
- T represents transposition.
- the calculation method of the parameters used in Expression (3) and the propagation path response vectors g k, l of each layer will be described.
- the NT- dimensional propagation path response vector g k, l of the l-th layer of the k wireless terminal is expressed by the following equation (4).
- * represents a complex conjugate. Since v k, l forms an orthonormal basis, g k, l generated by equation (4) is orthogonal to each other between layers. That is, the inner product of g k, l and g k, l ′ (l ⁇ l ′) is zero. In order to obtain the channel response vector of each layer, ⁇ and v are generated by performing singular value decomposition or eigenvalue decomposition on the channel response matrix.
- Equation (4) A method for calculating the parameters ⁇ and v used in Equation (4) using singular value decomposition will be described.
- An N R ⁇ N T propagation path response matrix H k whose element is an estimated value of the propagation path response between the wireless device and the k-th wireless terminal can be expressed as the following equation (5).
- the eigenvalue decomposition is applied to the N T ⁇ N T matrix H k H H k to calculate the eigenvalue ⁇ k, l and the eigenvector v k, l .
- averaging processing in the time / frequency direction may be performed on H k or H k H H k .
- the received SINR ⁇ k, l of the l-th layer of the k-th wireless terminal is obtained by using the propagation path response vector g k, l of the l-th layer of the k-th wireless terminal and the coefficient ⁇ k, l indicating the gain of the propagation path. And is estimated by the following equation (6).
- the method for generating the propagation path response vector g k, l of each layer is omitted because it is the same as the method described in Equation (5).
- ⁇ k, l is a normalized gain that takes the effect into account, and is calculated by the following equation (7).
- Equation (6) the correlation ⁇ (k, l) (k ′, k) of the propagation path between the l-th layer of the k-th wireless terminal and the l-th layer of the k′-wireless terminal .
- a method for calculating l ′) will be described. Using the channel response vector g k, l of the l-th layer of the k-th radio terminal and the channel response vector g k ′, l ′ of the l′-th layer of the k′-radio terminal, using the following equation (8) Calculated.
- G is obtained from the L ⁇ L matrix D whose diagonal component is the norm of the channel response vector of each layer and the non-diagonal component is 0, and the normalized channel response vector of each layer. It is represented by the product of the L ⁇ NT matrix G ′ that is configured.
- the N T ⁇ L transmission weight matrix W Tx when the ZF norm is applied can be expressed as the following equation (10).
- the product of G ′ and G ′ H in equation (10) is the correlation of the propagation path between the two layers where the diagonal component is 1 and the non-diagonal component is calculated from equation (8).
- the inverse matrix of the product of G ′ and G ′ H can be obtained using a cofactor matrix, and the elements of the inverse matrix can be expressed using the correlation of propagation paths between layers.
- Equation (7) the fourth-order term or more of the correlation of the propagation path between layers is ignored.
- the equation for calculating ⁇ k, l is not limited to Equation (7), and a fourth-order or higher term of the correlation of propagation paths between layers may be considered, or a third-order term may be ignored.
- ⁇ k, l is estimated using equation (7) by ignoring higher-order terms of the correlation between propagation paths between layers. The accuracy is degraded.
- ⁇ k, l may be derived from the following equation (11).
- Equation (7) Compared with the case where Equation (7) is used, although the estimation accuracy decreases when the number of layers is small, it is possible to avoid a large deterioration in estimation accuracy when the number of layers is large.
- coefficient of each term is set to 1, it is not limited to this. Further, third-order or higher terms of the correlation of propagation paths between layers may be considered.
- Three examples are given as a method of calculating ⁇ I 2 (k, l) indicating the interference power of other cells when the weight of the first example of the method of calculating the received SINR is used.
- a propagation path response between a radio apparatus serving as an interference source and a kth radio terminal, and a transmission weight vector (matrix) applied by the radio apparatus serving as an interference source are used.
- a channel quality indicator (CQI: Channel Quality Indicator) reported from the wireless terminal 4 to the scheduling unit 214 via the wireless device 3 is used.
- CQI Channel Quality Indicator
- reference signal received power (RSRP: Reference Signal Received Power) for each cell reported from the wireless terminal 4 to the control device 2 via the wireless device 3 is used. These are respectively expressed by the following formulas (12) to (14).
- ⁇ I 2 (k, l) indicating cell interference power using a transmission weight vector which is a first example.
- the number of the wireless device with which the kth terminal communicates is j
- the number of the other wireless device that is the interference source is j ′
- the set of wireless terminals selected by the j′th wireless device is U s, j ′
- the j′th The propagation path response matrix between the radio apparatus and the kth radio apparatus is H j ′, k
- the transmission weight vector corresponding to the l′ th layer of the k ′ radio terminal communicating with the j ′ radio apparatus is w Tx
- the wireless terminal 4 measures SINR using a known signal (reference signal) transmitted by the wireless device 3, compares it with a threshold value of SINR set for each CQI number, determines a CQI number, The number is reported to the scheduling unit 214 via the device 3.
- ⁇ I 2 (k, l) indicating cell interference power using RSRP. If the number of the wireless device with which the k-th wireless terminal communicates is j and the RSRP of the j-th wireless device in the k-th wireless terminal is RSRP j , ⁇ I 2 (k, l) is expressed by the following equations (14), (15) Is calculated by
- a method of calculating ⁇ I 2 (k, l) indicating other cell interference power when another SINR calculation method is used will be described.
- the configuration of the equations for calculating the interference power shown in the equations (12), (13), and (14) can be changed as appropriate depending on the method of calculating the SINR.
- the following calculation formulas (16), (17), (18), (19), (23), and (24) can be modified.
- a transmission weight vector is used to estimate ⁇ I 2 (k, l) indicating the interference power of other cells.
- the number of the wireless device with which the kth terminal communicates is j
- the number of the other wireless device that is the interference source is j ′
- the set of wireless terminals selected by the j′th wireless device is U s, j ′
- the j′th G j ′, k, l a channel response vector between the wireless device and the l-th layer of the k-th wireless device, and a transmission corresponding to the l′-th layer of the k′-wireless terminal communicating with the j′-wireless device
- the weight vector is w Tx, j ′, k ′, l ′ and the transmission power is P j ′, k ′, l ′
- ⁇ I 2 (k, l) is calculated by the following equation (16).
- the value of the correction coefficient ⁇ may be constant or may be adaptively changed according to the success or failure of communication.
- RSRP is used for estimation of ⁇ I 2 (k, l) indicating the interference power of other cells.
- ⁇ I 2 (k, l) is calculated by the following equation (18). .
- a transmission weight vector is used for estimating ⁇ I 2 (k, l) indicating the interference power of other cells.
- the number of the wireless device with which the kth terminal communicates is j
- the number of the other wireless device that is the interference source is j ′
- the set of wireless terminals selected by the j′th wireless device is U s, j ′
- the j′th The propagation response vector between the wireless device and the l-th layer of the k-th wireless device is represented by g j ′, k, l
- the transmission power for the l′-th layer of the k′-th wireless terminal communicating with the j′-th wireless device is calculated by the following equation (19).
- Equation (20) the fourth and higher order terms of the correlation of the propagation path between layers are ignored.
- the calculation formula of ⁇ j ′, (k, l) (k ′, l ′) is not limited to the formula (20), and a fourth-order or higher term of the correlation of the propagation path between layers may be considered, It is also possible to ignore the third-order term.
- ⁇ j ′, (k, l ) derived by Expression (20) is ignored by ignoring the higher-order term of the propagation path correlation between layers.
- the value of (k ′, l ′) can deviate greatly from the true value. Therefore, ⁇ j ′, (k, l) (k ′, l ′) may be derived from the following equation (22).
- coefficient of each term is set to 1, it is not limited to this. Further, third-order or higher terms of the correlation of propagation paths between layers may be considered.
- the value of the correction coefficient ⁇ may be constant or may be adaptively changed according to the success or failure of communication.
- RSRP is used for estimating ⁇ I 2 (k, l) indicating the interference power of other cells.
- ⁇ I 2 (k, l) is calculated by the following equation (24). .
- the noise power ⁇ n 2 is calculated by the following equation (25), where the Boltzmann constant is k B , the absolute temperature is T, the noise figure is F, and the bandwidth is W.
- T 290K
- F 9 dB
- the value of W may be any subcarrier interval (15 kHz in LTE).
- the wireless device 3 generates an orthogonal channel response for each layer using the estimated channel response value, and sends it to the control device 200.
- the remote radio signal processing unit 320 in the present embodiment includes an orthogonal channel response generation unit 351 as compared with the remote radio signal processing unit 320 in the first embodiment shown in FIG. Is different.
- the orthogonal channel response generation unit 351 generates an orthogonal channel response for each layer using the estimated value of the channel response between the radio apparatus 3 and the radio terminal 4 input from the channel response estimation unit 327. Then, it is output to the scheduling unit 214 and the antenna mapping unit 323 of the center radio signal processing unit 210.
- the wireless terminal that is the target for generating orthogonal channel response for each layer is not limited to the radio terminal with which the radio device 3 communicates, and the channel response for each layer with respect to the radio terminal with which another radio device communicates. May be generated.
- the orthogonal channel response generation unit 351 uses the estimated value of the channel response, compared to the wireless device 3 in the first embodiment shown in FIG. Then, the orthogonal channel response for each layer is generated (operation S901), and the generated orthogonal channel response for each layer is transmitted to the control device 200 (operation S902).
- the method of generating orthogonal channel response for each layer in operation S901 is the same as the method using the equation (4) of the first embodiment.
- the eigenvalue decomposition of the product of the singular value and right singular vector generated by the singular value decomposition of the channel response matrix whose elements are estimated values of the channel response, or the Hermitian transpose of the channel response matrix and the channel response matrix Using the eigenvalues and eigenvectors generated by (1), an orthogonal channel response for each layer is generated by Equation (4).
- averaging processing in the time / frequency direction may be performed on the product of the channel response matrix or the Hermitian transpose of the channel response matrix and the channel response matrix.
- the channel response vector may be transmitted to the control device 200 in the form of the vector norm and the channel response vector normalized by the norm instead of the orthogonal channel response vector for each layer. Further, it is not necessary to transmit all the orthogonal channel responses generated in operation S901, and the channel responses to be transmitted may be limited based on the norm of the channel response vector. Moreover, you may limit the propagation path response transmitted based on the instruction
- Operations other than operations S901 and S902 are the same as those in the first embodiment.
- the second or third example shown in the first embodiment is used as the SINR estimation method in the scheduling in operation S105.
- the wireless device when MU-MIMO transmission is used in the C-RAN configuration, the wireless device includes an orthogonal channel response generation unit that generates an orthogonal channel response based on the reference signal, and the control device
- the configuration is such that scheduling is performed using the orthogonal channel response received from the wireless device. Therefore, it is possible to reduce the amount of fronthaul communication as compared with the configuration in which the channel response estimation is transmitted from the wireless device to the control device.
- the wireless device 3 calculates the propagation path gain of each layer of each wireless terminal and the correlation of propagation paths between layers of different terminals, and sends them to the control device 200.
- the remote radio signal processing unit 320 in the present embodiment includes a propagation path gain / correlation calculation unit 352, compared to the remote radio signal processing unit 320 in the second embodiment shown in FIG. Is different.
- the propagation path gain / correlation calculation unit 352 uses the orthogonal propagation path response for each layer between the wireless device 3 and the wireless terminal 4 input from the orthogonal propagation path response generation unit 351, and propagates the propagation path of each layer. And the correlation of propagation paths between different layers of the terminal are calculated and output to the scheduling unit 214 of the center radio signal processing unit 210.
- the wireless terminal that is the target of calculating the propagation path gain of each layer and the propagation path correlation between different terminal layers is not limited to the wireless terminal with which the wireless apparatus 3 communicates, and other wireless apparatuses communicate with each other. For each wireless terminal, the gain of the propagation path of each layer and the correlation of propagation paths between layers of the different terminals may be calculated.
- the gain and correlation calculated by the propagation path gain / correlation calculation section 352 are not limited to the propagation path gain of each layer and the correlation of propagation paths between layers of different terminals, and the propagation path response estimation section 327 outputs Using the estimated value of the propagation path response, the gain of the propagation path of each wireless terminal may be different from the correlation of the propagation path between terminals.
- the wireless device 3 in the present embodiment has a propagation path gain / correlation calculation unit 352 in which the propagation path is orthogonal to each layer compared to the wireless device 3 in the second embodiment illustrated in FIG. 9.
- the propagation path gain of each layer and the correlation of propagation paths between layers of different terminals are calculated (operation S1101), and the calculated propagation path gain of each layer and the correlation of propagation paths between layers are calculated.
- the data is transmitted to the control device 200 (operation S1102).
- the propagation path gain of each layer is calculated as the norm of orthogonal propagation path response vectors for each layer.
- the correlation of propagation paths between layers is calculated from Equation (7) in the first embodiment using orthogonal propagation path responses for each layer.
- Operations other than operations S1101 and S1102 are the same as in the second embodiment.
- the third example shown in the first embodiment is used as the SINR estimation method in the scheduling in operation S105.
- the channel gain of each layer of each wireless terminal and the propagation between layers of different terminals are based on the reference signal to the wireless device.
- a channel gain / correlation generator for calculating channel correlation is provided, and the control device performs scheduling using the channel gain and correlation received from the radio device. Therefore, the communication amount of the fronthaul can be reduced as compared with the configuration in which the orthogonal channel response is transmitted from the wireless device to the control device.
- the wireless device 3 generates a transmission weight matrix using the estimated value of the propagation path response, and sends it to the control device 200.
- the remote radio signal processing unit 320 in the present embodiment is different from the remote radio signal processing unit 320 in the first embodiment shown in FIG. 2 in that a transmission weight generation unit 361 is provided. .
- the transmission weight generation unit 361 generates a transmission weight matrix using the estimated value of the propagation path response between the wireless device 3 and the wireless terminal 4 input from the propagation path response estimation unit 327, and generates the transmission weight matrix.
- the data is output to the scheduling unit 214 of the processing unit 210.
- the orthogonal channel response unit 351 in the second embodiment may be provided in the remote radio signal processing unit 320, and a transmission weight matrix may be generated using the orthogonal channel response for each layer.
- the transmission weight generation unit 361 transmits using the estimated value of the propagation path response, compared to the wireless device 3 in the first embodiment illustrated in FIG. 3.
- a weight is generated (operation S1301), and the generated transmission weight is transmitted to the control device 200 (operation S1302).
- a transmission weight matrix is generated for each combination of several wireless terminals selected based on the correlation of propagation paths between terminals, the communication frequency of each wireless terminal, and the like. MRT, ZF, SLNR, etc. are used as transmission weight generation rules.
- Operations other than operations S1301 and S1302 are the same as those in the first embodiment.
- the wireless device when MU-MIMO transmission is used in a C-RAN configuration, the wireless device includes a transmission weight generation unit, and the control device uses the propagation path response estimation and the transmission weight received from the wireless device. To perform scheduling. Therefore, it is not necessary to provide a transmission weight generation function in the control device, and the cost of the control device can be reduced.
- each function included in the wireless device and the control device in each embodiment described above is a computer device among a microprocessor, a circuit, a transmitter, a receiver, and the like included in the device 1000 as shown in FIG. (Processor) 1001 may be implemented by causing one or a plurality of programs to be executed.
- the program can be stored and provided to a computer using various types of non-transitory computer readable media.
- Non-transitory computer media include various types of real-life recording media.
- non-transitory computer-readable media examples include a magnetic recording medium, a magneto-optical recording medium, a CD (Compact Disc), a DVD (Digital Versatile Disc), a BD (Blu-ray Disc), and a semiconductor memory.
- the program may also be supplied to the computer by various types of temporary computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to a computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
- the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.
- various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.
- constituent elements over different embodiments may be appropriately combined.
- the following modes are possible.
- [Form 1] As in the wireless device according to the first aspect.
- [Form 2] The radio apparatus according to mode 1, wherein the radio apparatus includes a reception unit that receives a reference signal from the radio terminal, and the propagation path response estimation unit estimates a propagation path response based on the reference signal.
- [Form 3] The radio apparatus according to mode 1 or 2, wherein the propagation path information has a smaller amount of information than the propagation path response.
- the propagation path information is at least one of a propagation path response, an orthogonal propagation path response, a propagation path gain, a propagation path correlation, and a transmission weight.
- the wireless device according to any one of Embodiments 1 to 4 which is physically separated from the control device and connected to the control device via a transmission path.
- the wireless device according to any one of Embodiments 1 to 5 wherein the wireless terminal is a wireless terminal that communicates with the wireless device or another wireless device.
- the radio apparatus includes a reception unit that receives scheduling information from the control apparatus, and the scheduling information includes information for spatially multiplexing resources allocated to a plurality of terminals. Wireless devices.
- the propagation path response is a propagation path response estimated based on a reference signal transmitted from the wireless terminal.
- [Mode 10] The control device according to mode 8 or 9, wherein the propagation path information has a smaller amount of information than the propagation path response.
- [Form 11] The control according to any one of forms 8 to 10, wherein the propagation path information is at least one of a propagation path response, an orthogonal propagation path response, a propagation path gain, a propagation path correlation, and a transmission weight. apparatus.
- [Form 12] The control device according to any one of Forms 8 to 11, which is physically separated from the wireless device and connected to the wireless device via a transmission path.
- [Form 13] The control device according to any one of Forms 8 to 12, wherein the wireless terminal is a wireless terminal that communicates with the wireless device or another wireless device.
- the control apparatus according to any one of Forms 8 to 13, wherein the scheduling information includes information for spatially multiplexing resources allocated to a plurality of terminals.
- the wireless communication system according to the third aspect is as described above.
- the propagation path response is a propagation path response estimated based on a reference signal received from the wireless terminal.
Abstract
Description
本発明は、日本国特許出願:特願2015-212520号(2015年10月29日出願)に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、無線基地局の機能を無線装置と制御装置とに分割した無線通信システム構成における、無線装置、制御装置および無線通信システムに関する。
本発明の一実施形態の構成では、無線装置3において、無線端末4からの参照信号(SRS:Sounding Reference Signal)を基に、無線端末4との間の伝搬路応答(Channel Response)を推定する伝搬路応答推定部327と、推定した伝搬路情報を制御装置200に送信する送信部34とを備え、制御装置200において、無線装置3から受信した伝搬路情報を用いてスケジューリングを行うスケジューリング部214を備えている。
<実施形態1>
図1は、本実施形態における無線通信システムの構成を示すブロック図である。無線通信システムは、コアネットワーク100、制御装置200、無線装置300-1(無線装置#1)、無線装置300-2(無線装置#2)、無線端末400-1(無線端末#1)、無線端末400-2(無線端末#2)、および、無線端末400-3(無線端末#3)を備えている。なお、無線装置300-1、300-2の区別が不要な場合には、単に無線装置3と表記することとする。無線端末400-1、400-2、400-3に関しても同様に、区別が不要な場合には無線端末4と表記する。また、図1に示す無線通信システムでは無線装置3を2つ備えているが、無線装置3の数はこれに限定されない。無線端末4についても同様にその数は限定されない。また、ここでは一つの例として無線端末としているが、中継能力を持った無線装置でもよい。
本実施形態では、無線装置3が伝搬路応答の推定値を用いてレイヤごとの直交した伝搬路応答(Orthogonal Channel Response)を生成し、それを制御装置200に送る。
本実施形態では、無線装置3が各無線端末の各レイヤの伝搬路の利得と異なる端末のレイヤ間の伝搬路の相関とを計算し、それらを制御装置200に送る。
本実施形態では、無線装置3が伝搬路応答の推定値を用いて送信ウェイト行列を生成し、制御装置200に送る。
なお、以上に述べた各実施形態における無線装置および制御装置に内包される各機能は図14に記載しているように装置1000に含まれるマイクロプロセッサ、回路、トランスミッタ、レシーバ等のうちのコンピュータ装置(プロセッサ)1001に1又は複数のプログラムを実行させることによって実現してもよい。このプログラムは、様々なタイプの非一時的なコンピュータ可読媒体を用いて格納され、コンピュータに供給することができる。非一時的なコンピュータ媒体は、様々なタイプの実態のある記録媒体を含む。非一時的なコンピュータ可読媒体の例は、磁気記録媒体、光磁気記録媒体、CD(Compact Disc)、DVD(Digital Versatile Disc)、BD(Blu-ray Disc)、半導体メモリ、を含む。またプログラムは、様々なタイプの一時的なコンピュータ可読媒体によってコンピュータに供給されてもよい。一時的なコンピュータ可読媒体の例は、電気信号、光信号、及び電磁波を含む。一時的なコンピュータ可読媒体は、電線及び光ファイバ等の有線通信路、または無線通信路を介してプログラムをコンピュータに供給できる。
[形態1]
上記第1の態様に係る無線装置のとおりである。
[形態2]
前記無線装置は、前記無線端末から参照信号を受信する受信部を備え、前記伝搬路応答推定部は、前記参照信号に基づいて伝搬路応答を推定する、形態1に記載の無線装置。
[形態3]
前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、形態1または2に記載の無線装置。
[形態4]
前記伝搬路情報は、伝搬路応答、直交伝搬路応答、伝搬路利得、伝搬路相関、および、送信ウェイトの少なくともいずれか一つである、形態1ないし3のいずれか一に記載の無線装置。
[形態5]
前記制御装置と物理的に分離され、伝送路を介して前記制御装置に接続される、形態1ないし4のいずれか一に記載の無線装置。
[形態6]
前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、形態1ないし5のいずれか一に記載の無線装置。
[形態7]
前記無線装置は、前記制御装置からスケジューリング情報を受信する受信部を備え、前記スケジューリング情報は、複数の端末へ割り当てられたリソースを空間多重させる情報を含む、形態1ないし6のいずれか一に記載の無線装置。
[形態8]
上記第2の態様に係る制御装置のとおりである。
[形態9]
前記伝搬路応答は、前記無線端末から送信された参照信号に基づいて推定される伝搬路応答である、形態8に記載の制御装置。
[形態10]
前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、形態8または9に記載の制御装置。
[形態11]
前記伝搬路情報は、伝搬路応答、直交伝搬路応答、伝搬路利得、伝搬路相関、および、送信ウェイトのうちの少なくともいずれか一つである、形態8ないし10のいずれか一に記載の制御装置。
[形態12]
前記無線装置と物理的に分離され、前記無線装置に伝送路を介して接続される、形態8ないし11のいずれか一に記載の制御装置。
[形態13]
前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、形態8ないし12のいずれか一に記載の制御装置。
[形態14]
前記スケジューリング情報は、複数の端末に割り当てられたリソースを空間多重させる情報を含む、形態8ないし13のいずれか一に記載の制御装置。
[形態15]
上記第3の態様に係る無線通信システムのとおりである。
[形態16]
前記伝搬路応答は、前記無線端末から受信した参照信号に基づいて推定した伝搬路応答である、形態15に記載の無線通信システム。
[形態17]
前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、形態15または16に記載の無線通信システム。
[形態18]
前記無線装置と前記制御装置は、物理的に分離され、伝送路を介して接続される、形態15ないし17のいずれか一に記載の無線通信システム。
[形態19]
前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、形態15ないし18のいずれか一に記載の無線通信システム。
[形態20]
前記スケジューリング情報は、複数の端末に割り当てられたリソースを空間多重させる情報を含む、形態15ないし19のいずれか一に記載の無線通信システム。
<ネットワーク>
100:コアネットワーク
<制御装置>
200:制御装置
22:受信部
23:送信部
210:センター無線信号処理部
211:PDCP層処理部
212:RLC層処理部
213:MAC層処理部
214:スケジューリング部
220:伝送路IF
<無線装置>
3、300-1、300-2:無線装置
33:伝搬路情報生成部
34:送信部
310:伝送路IF
320:リモート無線信号処理部
321:符号化部
322:変調部
323:アンテナマッピング部
324:リソースマッピング部
325:IFFT部
326:FFT部
327:伝搬路応答推定部
330:無線送受信部
340:アンテナ
351:直交伝搬路応答生成部
352:伝搬路利得・相関計算部
361:送信ウェイト生成部
<無線端末>
4、400-1~400-3:無線端末
<装置>
1000:装置
1001:プロセッサ
Claims (20)
- 無線端末と自装置との間の伝搬路応答を推定する伝搬路応答推定部と、
推定した前記伝搬路応答から伝搬路情報を生成する伝搬路情報生成部と、
生成した前記伝搬路情報を制御装置に送信する送信部と、を備える、
ことを特徴とする無線装置。 - 前記無線装置は、前記無線端末から参照信号を受信する受信部を備え、
前記伝搬路応答推定部は、前記参照信号に基づいて伝搬路応答を推定する、
請求項1に記載の無線装置。 - 前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、
請求項1または2に記載の無線装置。 - 前記伝搬路情報は、伝搬路応答、直交伝搬路応答、伝搬路利得、伝搬路相関、および、送信ウェイトの少なくともいずれか一つである、
請求項1ないし3のいずれか1項に記載の無線装置。 - 前記制御装置と物理的に分離され、伝送路を介して前記制御装置に接続される、
請求項1ないし4のいずれか1項に記載の無線装置。 - 前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、
請求項1ないし5のいずれか1項に記載の無線装置。 - 前記無線装置は、前記制御装置からスケジューリング情報を受信する受信部を備え、
前記スケジューリング情報は、複数の端末へ割り当てられたリソースを空間多重させる情報を含む、
請求項1ないし6のいずれか1項に記載の無線装置。 - 無線端末と無線装置との間の推定された伝搬路応答に基づいて前記無線装置が生成した伝搬路情報を受信する受信部と、
前記伝搬路情報からスケジューリング情報を生成するスケジューリング部と、
前記スケジューリング情報を前記無線装置に送信する送信部と、を備える、
ことを特徴とする制御装置。 - 前記伝搬路応答は、前記無線端末から送信された参照信号に基づいて推定される伝搬路応答である、
請求項8に記載の制御装置。 - 前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、
請求項8または9に記載の制御装置。 - 前記伝搬路情報は、伝搬路応答、直交伝搬路応答、伝搬路利得、伝搬路相関、および、送信ウェイトのうちの少なくともいずれか一つである、
請求項8ないし10のいずれか1項に記載の制御装置。 - 前記無線装置と物理的に分離され、前記無線装置に伝送路を介して接続される、
請求項8ないし11のいずれか1項に記載の制御装置。 - 前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、
請求項8ないし12のいずれか1項に記載の制御装置。 - 前記スケジューリング情報は、複数の端末に割り当てられたリソースを空間多重させる情報を含む、
請求項8ないし13のいずれか1項に記載の制御装置。 - 無線装置および制御装置を備え、
前記無線装置は、無線端末と前記無線装置との間の伝搬路応答を推定する伝搬路応答推定部と、
前記伝搬路応答から伝搬路情報を生成する伝搬路情報生成部と、
前記伝搬路情報を前記制御装置に送信する送信部と、を有し、
前記制御装置は、前記伝搬路情報からスケジューリング情報を生成するスケジューリング部と、
前記スケジューリング情報を前記無線装置に送信する送信部と、を有する、
ことを特徴とする無線通信システム。 - 前記伝搬路応答は、前記無線端末から受信した参照信号に基づいて推定した伝搬路応答である、
請求項15に記載の無線通信システム。 - 前記伝搬路情報は、前記伝搬路応答よりも情報量が少ない、
請求項15または16に記載の無線通信システム。 - 前記無線装置と前記制御装置は、物理的に分離され、伝送路を介して接続される、
請求項15ないし17のいずれか1項に記載の無線通信システム。 - 前記無線端末は、前記無線装置またはその他の無線装置と通信する無線端末である、
請求項15ないし18のいずれか1項に記載の無線通信システム。 - 前記スケジューリング情報は、複数の端末に割り当てられたリソースを空間多重させる情報を含む、
請求項15ないし19のいずれか1項に記載の無線通信システム。
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