WO2015019776A1 - 無線基地局装置、およびスケジューリング方法 - Google Patents
無線基地局装置、およびスケジューリング方法 Download PDFInfo
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- WO2015019776A1 WO2015019776A1 PCT/JP2014/068065 JP2014068065W WO2015019776A1 WO 2015019776 A1 WO2015019776 A1 WO 2015019776A1 JP 2014068065 W JP2014068065 W JP 2014068065W WO 2015019776 A1 WO2015019776 A1 WO 2015019776A1
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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
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
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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
- H04B7/10—Polarisation diversity; Directional diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to the field of radio communication technology, and more particularly, to a radio base station apparatus having a multi-mode antenna and a scheduling method for selecting an optimal antenna configuration according to information about a user.
- a system using an active antenna (AAS: Active Antenna System) having antenna elements arranged in a vertical direction is being studied.
- AAS Active Antenna System
- 3D-MIMO Three-DimensionalDimensionMultiple Input Multiple Output
- an antenna port can be set for each antenna element.
- an antenna port can be configured by combining a plurality of antenna elements.
- the antenna port corresponds to the MIMO branch, but it is also conceivable to further group the antenna ports so as to correspond to the MIMO branch.
- different antenna configurations can be realized depending on how the antenna ports are grouped into predetermined groups (branches). For example, a multi-mode antenna has been proposed in which antenna elements are grouped to perform data transmission / reception according to a communication type such as a scheme, rank, and number of multiplexed users (see, for example, Patent Document 1).
- transmission information sequences transmitted simultaneously from different transmission antenna branches are all for the same user, single user MIMO (SU-MIMO) transmission, and multi-user MIMO for multiple users (MU-MIMO) transmission.
- SU-MIMO single user MIMO
- MU-MIMO multi-user MIMO for multiple users
- transmission information is transmitted in parallel at the same time by controlling the phase and amplitude of a signal of a transmission antenna branch that is different for each transmission information sequence.
- transmission information is simultaneously transmitted in parallel using an antenna branch having a low correlation.
- Multi-user MIMO reduces the interference between users by controlling the phase and amplitude of signals in different transmit antenna branches for users or for transmission streams and users, and simultaneously transmits transmission information in parallel.
- Send Alternatively, transmission information is simultaneously transmitted in parallel using an antenna branch having a low correlation.
- SU-MIMO scheduling if the Rank is determined based on the reception quality, generally used scheduling such as proportional fairness, round robin, and Max CIR can be performed.
- a scheduling method of MU-MIMO a method is proposed in which optimal resource allocation is performed in consideration of reception quality when user data is spatially multiplexed with M antenna elements using I resource blocks. (For example, refer to Patent Document 2).
- an object of the present invention is to provide a technique and a configuration that can reduce processing delay and enable efficient scheduling in a system that uses antennas having a plurality of different antenna configurations (hereinafter referred to as multimode antennas).
- the scheduling and the allocation of the antenna configuration for the user apparatus are determined in combination from the position information of each user apparatus and / or the phase difference information between the antenna ports of the uplink signal and the channel information.
- position information information such as the current position of the user apparatus, the distance from the base station, the moving speed, the moving direction, and the user distribution can be used.
- the radio base station apparatus A multi-mode antenna having a plurality of different antenna configurations;
- An acquisition unit for acquiring at least one of position information of a user apparatus or phase difference information between antenna ports of a signal transmitted from the user apparatus, and channel information of the user apparatus;
- a determining unit that determines scheduling for the user apparatus in combination with the antenna configuration that is allocated to the user apparatus based on the acquired information;
- FIG. 1 is a schematic configuration diagram of a wireless communication system to which the present invention is applied.
- 3 is a flowchart illustrating a scheduling method including determination of an antenna configuration according to the first embodiment. It is a specific flow of UE pair and antenna configuration determination in the method of FIG. It is the schematic of the multimode antenna used with the radio base station apparatus of embodiment.
- 1 is a diagram illustrating an antenna configuration 1.
- FIG. FIG. 3 is a diagram illustrating an antenna configuration 2; 6 is a diagram illustrating an antenna configuration 3.
- FIG. It is a figure which shows another example of grouping of an antenna structure. It is a figure which shows another example of grouping of an antenna structure. It is a figure which shows another example of grouping of an antenna structure. It is a figure which shows another example of grouping of an antenna structure.
- FIG. 9 It is a figure which shows the example of the beam formed with the antenna structure of FIG. 9 or FIG. It is a figure which shows the relationship between the positional information on UE pair, and an antenna structure. It is a figure which shows the structural example of the radio base station apparatus of embodiment. It is a figure which shows the structural example of the user apparatus of embodiment. It is a figure which shows the scheduling method including determination of the antenna structure of Example 2.
- FIG. It is a specific flow of UE pair and antenna configuration determination in the method of FIG.
- FIG. It is a specific flow of UE pair and antenna configuration determination in the method of FIG.
- FIG. It is a specific flow of UE pair and antenna configuration determination in the method of FIG.
- FIG. 4 shows the scheduling method including determination of the antenna structure of Example 4.
- FIG. 20 is a specific flow of UE pair and antenna configuration determination in the method of FIG. It is a figure which shows the example of selection of the antenna structure according to distribution of UE. It is a figure which shows another structural example of the multimode antenna used with a radio base station apparatus. It is a figure which shows the example of selection of the antenna structure according to the positional information on UE pair.
- FIG. 1 is a schematic configuration diagram of a wireless communication system 1 to which the present invention is applied.
- the radio communication system includes a radio base station apparatus (eNB) 10 and user apparatuses (UE) 40-1, 40-2,... 40-n (n is an integer of n> 0. Hereinafter, it is collectively referred to as “UE40” as appropriate. )including.
- the eNB 10 includes a multi-mode antenna 11 that can form a directional beam and change the antenna configuration according to a plurality of communication types.
- the eNB 10 transmits data to each of the UEs 40 using part or all of the antenna elements of the multimode antenna 11.
- the eNB 10 selects, for example, one UE suitable for each radio resource block (RB) from the UEs 40-1, 40-2,... 40-n (n is an integer of n> 0) according to the position information. Alternatively, two or more UE pairs or groups and an antenna configuration to be assigned to the UE or UE pair or group are selected.
- the “antenna configuration” here refers to a configuration determined by a grouping method in which the antenna ports of the multimode antenna 11 are divided into predetermined groups (branches). Thereby, eNB10 performs efficient scheduling for UE40.
- FIG. 2 shows a scheduling method including determination of the antenna configuration according to the first embodiment.
- the eNB 10 transmits a downlink reference signal at a predetermined time interval for each antenna port and for each predetermined frequency unit.
- the downlink reference signal can be transmitted not for each antenna port but for each branch in which antenna ports are grouped.
- the downlink signal reference signal is, for example, a reference signal for channel state information (CSI-RS: Channel Information Reference Signal), but may be a CRS (Cell-specific Reference Signal) or DM-RS (Demodulation Reference Signal). Good.
- CSI-RS Channel State Information Reference Signal
- CRS Cell-specific Reference Signal
- DM-RS Demodulation Reference Signal
- each UE 40 receives the CSI-RS, generates CSI including the reception quality of the downlink channel, and transmits the generated CSI together with the positional information of the UE 40 to the eNB 10 through the uplink control channel.
- the CSI is information based on instantaneous downlink channel conditions, and may include a precoding matrix index (PMI), a rank index (RI), and the like in addition to channel quality information (CQI).
- PMI precoding matrix index
- RI rank index
- CQI channel quality information
- the eNB 10 determines, for each radio resource block (RB), one UE or a pair of two or more UEs to be combined with the antenna configuration based on the CSI and UE location information notified from each UE 40. Determine and assign groups. Details of this step will be described later.
- RB radio resource block
- the eNB 10 generates a PDCCH (Physical Downlink Control Channel), a PDSCH (Physical Downlink Shared Channel), and a precoding weight based on the determined allocation information. To do. A control signal and a data signal are transmitted by PDCCH and PDSCH by a directional beam formed by the precoding weight.
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- FIG. 3 is a specific processing flow when determining the antenna configuration and the UE pair in S103 of FIG.
- the eNB 10 calculates the ratio of the instantaneous received power and the average received signal power of each UE 40 for each RB, and selects the UE with the highest ratio (this is referred to as “UE1”).
- This method assigns radio resources to the UE 40 in which the instantaneous throughput expected when radio resources are assigned becomes larger than the average throughput so far, and is called proportional fairness.
- any method for determining the highest priority UE to which radio resources are allocated may be employed.
- the antenna configuration selection method shown in FIG. 12 is used for the antenna configuration candidates of i (where “i” is the total number of antenna configurations and i> 0 is an integer) from the positional relationship with UE1 ( This will be described later), and one optimal pair candidate UE (UE2i) is selected from the UEs 40 excluding UE1. This eliminates the need for verifying the orthogonality of the channel with UE1 for all other UEs except UE1 from UE40.
- the orthogonality between the UE pair candidate UE1 and UE2i is calculated for each antenna configuration.
- FIG. 4 shows an example of the multimode antenna 11 of the eNB 10.
- FIG. 5 shows an example of the antenna configuration 1 of the multimode antenna 11.
- the antenna port of the multimode antenna 11 is divided into groups in the horizontal direction.
- the vertical polarization of port numbers 1 to 4 is group 1
- the horizontal polarization of port numbers 1 to 4 is group 2
- the vertical polarization of port numbers 5 to 8 is group 3
- the port The horizontally polarized waves with numbers 5 to 8 are group 4.
- the groups are not divided in the vertical direction, and there are two groups for vertical polarization and two groups for horizontal polarization in the horizontal direction, and the horizontal group spacing is relatively narrow (around half-wavelength).
- the antenna configuration 1 can be referred to as a “horizontal array configuration”.
- this antenna configuration is assigned to the UE by the scheduler, DM-RS and PDSCH for the UE are transmitted using this antenna configuration. The same signal is transmitted from the ports in the group.
- the antenna configuration 1 is advantageous when the horizontal angle formed by the UE 40 pair with respect to the eNB 10, that is, when the azimuth angle between the UE pairs with respect to the eNB 10 is large.
- the antenna configuration 1 is highly robust against movement of the UE 40 in the horizontal direction with respect to the antenna of the base station. For this reason, in the antenna configuration 1, the UE 40 assigned by the scheduler is stationary with respect to the antenna of the base station (eNB 10) or is moving in the horizontal direction (circumferential direction or tangential direction) with respect to the antenna of the base station. Is particularly useful.
- FIG. 6 shows an example of the antenna configuration 2 of the multimode antenna 11.
- the antenna configuration 2 groups the antenna ports of the multimode antenna 11 in groups in the vertical direction.
- the vertical polarization of port numbers 1 and 2 is group 1
- the horizontal polarization of port numbers 1 and 2 is group 2
- the vertical polarization of port numbers 3 and 4 is group 3
- port number 3 is The horizontal polarization of 4 is defined as group 4.
- Other antenna ports may be used as separate branches or may not be used.
- the multimode antenna 11 operates as an antenna corresponding to 4 ports. Since the antenna port is arranged in the vertical direction, an appropriate beam can be directed to the UE 40 that exists or moves (away from or approaches the base station) at a different position in the elevation angle direction when viewed from the eNB 10.
- the antenna configuration 2 can be referred to as a “vertical diversity configuration”.
- this antenna configuration is allocated to the UE by the scheduler, DM-RS and PDSCH for the allocated UE are transmitted using this antenna configuration.
- Antenna configuration 2 is suitable when the pair of UEs 40 has a certain degree of angular difference in the vertical direction, that is, the depression direction as viewed from the eNB 10.
- the antenna configuration 2 is highly robust to movement of the UE 40 in different directions (away from or closer to the base station) in the depression direction with respect to the antenna of the base station. For this reason, in the antenna configuration 2, the UE 40 allocated by the scheduler is stationary with respect to the antenna of the base station or is moving in a different direction (away from or closer to the base station) with respect to the antenna of the base station. Sometimes especially useful. Even when scheduling a single user, an antenna configuration that is highly robust with respect to the moving direction of the user is selected.
- FIG. 7 shows an example of the antenna configuration 3 of the multimode antenna 11.
- the antenna configuration 3 finely groups the antenna ports of the multimode antenna 11 in the vertical direction. 7, the vertical polarization of port number 1 is group 1, the horizontal polarization of port number 1 is group 2, the vertical polarization of port number 2 is group 3, and the horizontal polarization of port number 2 is group 4.
- the antenna ports are grouped so that the vertical polarization of port number 3 is group 5 and the horizontal polarization of port number 3 is group 6.
- the group spacing in the horizontal direction and the vertical direction of the multimode antenna 11 is relatively narrow (about half wavelength), and the group spacing in the vertical direction is half that of the antenna configuration 2.
- the antenna configuration 3 is referred to as a “vertical array configuration”. When this antenna configuration is allocated to the UE by the scheduler, DM-RS and PDSCH for the allocated UE are transmitted using this antenna configuration.
- This configuration is advantageous when the pair of UEs 40 is far away from each other in the depression direction (the radial direction of the cell), that is, when one of the UE pairs is located far from the eNB 10 and the other is located in the vicinity of the eNB 10. It is.
- the UEs 40 are stationary with respect to the base station or moving in the horizontal direction (circumferential direction or tangential direction), and the beam width is wide, so that the movement is slightly oblique (the component in the perspective direction with respect to the eNB 10 is included). There may be movement). Even when scheduling a single user, an antenna configuration having high robustness in the moving direction of the user is selected.
- FIG. 8 shows an example of still another antenna configuration of the multimode antenna 11.
- a plurality of antenna ports of the multimode antenna 11 are grouped in the vertical direction.
- Vertical polarization of port numbers 1 and 2 is group 1
- horizontal polarization of port numbers 1 and 2 is group 2
- vertical polarization of port numbers 3 and 4 is group 3
- horizontal polarization of port numbers 3 and 4 is group 4.
- Vertical polarization of port numbers 5 and 6 is group 5
- horizontal polarization of port numbers 5 and 6 is group 6
- vertical polarization of port numbers 7 and 8 is group 7, horizontal polarization of port numbers 7 and 8 Is group 8.
- the group In the vertical direction, the group has two groups of vertical polarization and horizontal polarization, and the diversity between the groups is relatively wide (a few wavelengths or more apart), thereby realizing vertical diversity.
- Array vertical diversity In this sense, the antenna configuration of FIG. 8 can be referred to as a “horizontal array vertical diversity configuration”.
- This antenna configuration is suitable when the pair of UEs 40 has a certain angle difference in the vertical direction, that is, the depression direction when viewed from the eNB 10, and the azimuth angle between the UE pairs is large.
- This antenna configuration is highly robust to movement of the UE 40 in the horizontal and vertical directions. Even when scheduling a single user, an antenna configuration that is highly robust to user movement is selected.
- FIG. 9 shows an example of an antenna configuration in which the antenna ports of the multimode antenna 11 are grouped unevenly.
- Vertical polarization of port numbers 1 to 3 is group 1
- horizontal polarization of port numbers 1 to 3 is group 2
- vertical polarization of port number 4 is group 3
- horizontal polarization of port number 4 is group 4
- port number The vertical polarization of 5 to 7 is group 5, the horizontal polarization of port numbers 5 to 7 is group 6, the vertical polarization of port number 8 is group 7, and the horizontal polarization of port number 8 is group 8.
- FIG. 10 shows an antenna configuration example in which the antenna port of the multimode antenna array 11 is partially shared.
- Vertical polarization of port numbers 1 to 4 is group 1
- horizontal polarization of port numbers 1 to 4 is group 2
- vertical polarization of port number 4 is group 3
- horizontal polarization of port number 4 is group 4
- port number The vertical polarization of 5 to 8 is group 5, the horizontal polarization of port numbers 5 to 8 is group 6, the vertical polarization of port number 8 is group 7, and the horizontal polarization of port number 8 is group 8 and 8-port sweeping.
- the vertical polarization of port number 4 is shared by groups 1 and 3, and the horizontal polarization of port number 4 is shared by group 2 and group 4.
- the vertical polarization and horizontal polarization of port number 8 are shared between the groups. Even with such a configuration, different beam widths can be realized.
- FIG. 11 shows an example of a beam formed with the antenna configuration of FIG. 9 or FIG.
- a beam having a narrow beam width as shown by a solid line can be formed for a remote UE, and a relatively broad beam can be formed like a dotted line for a nearby UE.
- FIG. 12 is a diagram illustrating a relationship between the antenna configuration, the positional relationship of the UE 40, and the moving speed.
- the horizontal axis indicates the angular difference in the horizontal direction (circumferential direction) between UE1 and UE2i.
- the horizontal axis also indicates the moving speed in the vertical direction (the depression direction or radial direction) of UE1 and UE2i. As the value on the horizontal axis increases, the spacing between the antenna groups in the horizontal direction of the multimode antenna 11 decreases.
- the vertical axis indicates the angular difference in the vertical direction (the depression direction) between UE1 and UE2i.
- the vertical axis also indicates the moving speed in the horizontal direction (circumferential direction) of UE1 and UE2i. As the value on the vertical axis increases, the interval between the antenna groups in the vertical direction of the multimode antenna 11 decreases.
- a thick solid line frame indicates a range suitable for using the antenna configuration 1.
- a thick dashed frame indicates a range in which the horizontal diversity configuration is suitable. In this case, the horizontal interval between the antenna groups becomes as wide as several wavelengths.
- the thin solid line frame indicates a range suitable for using the antenna configuration 3.
- a thin dashed frame indicates a range suitable for using the antenna configuration 2.
- a UE (one UE or a set of two or more UEs) corresponding to the location information (including movement information) of the UE 40 and an antenna allocated to this UE (or UE pair) Since the configuration is selected, the calculation amount and processing time required for scheduling can be reduced.
- FIG. 13 is a schematic configuration diagram of the radio base station apparatus (eNB) 10.
- the transmission data to each user is subjected to channel coding by the channel coding unit 27a and data modulation by the data modulating unit 27b.
- the channel coding rate and the modulation scheme of each user data are determined by the MIMO switching unit 24 based on the antenna configuration described later and the output of the UE pair determination unit 23.
- the transmission data subjected to channel coding and data modulation is input to the subcarrier mapping unit 28 together with the reference signal, broadcast signal, system information, etc., and is mapped to the subcarrier allocated by the resource allocation control unit 25. Resource allocation by the resource allocation control unit 25 is controlled based on the antenna configuration and the output of the UE pair determination unit 23.
- Each mapped transmission data is multiplied by a corresponding precoding weight in a precoding multiplication unit 29 and weighted (amplitude and / or phase adjustment) for each antenna unit 12.
- the precoding weight is controlled by the precoding weight control unit 26 based on the antenna configuration and the output of the UE pair determination unit.
- the transmission signals of each user are combined by a multiplexer (MUX) 30 to generate a transmission signal for each antenna unit 12.
- the antenna unit 12 corresponds to an antenna port.
- the transmission signal for each antenna unit 12 is processed by the duplexer 13 through an inverse Fourier transform by the IFFT unit 31, addition of a cyclic prefix by the cyclic prefix (CP) adding unit 32, and frequency conversion by the RF transmission circuit 33. To be transmitted to the UE on the downlink.
- CP cyclic prefix
- the uplink signal from each UE is received by each antenna unit 12 of the multimode antenna 11 and input to the corresponding RF receiving circuit 14 via the duplexer.
- the RF receiver circuit 14 performs frequency conversion to baseband, a cyclic prefix (CP) removing unit 15 removes a cyclic prefix, and an FFT unit 16 performs fast Fourier transform.
- CP cyclic prefix
- FFT unit 16 performs fast Fourier transform.
- the Of each user's signal, the data channel signal is demodulated by the data demodulator 18 using the estimated value estimated from the demodulation reference signal by the channel estimator 20 to obtain received data.
- the location information demodulator 19 extracts location information from the received data and supplies it to the antenna configuration and UE pair determination unit 23.
- the control channel demodulation unit 21 demodulates the control channel using the channel estimation value estimated from the CSI-RS by the channel estimation unit 20.
- a CSI (Channel State Indicator) updating unit 22 extracts the CSI of the user from the control channel and updates the channel state information.
- the updated CSI information is input to the antenna configuration and UE pair determination unit 23.
- the antenna configuration and UE pair determination unit 23 determines the UE pair and antenna configuration for each resource based on the UE location data and the channel information of each UE.
- a combination of a UE pair and an antenna configuration suitable for the UE pair are selected from candidates that are confined to a certain range from UE location data and channel information, so that efficient processing can be performed without increasing the amount of calculation. Done.
- the user having the highest priority for the radio resource of interest and the antenna configuration assigned to this user are determined in combination.
- the antenna configuration and UE pair determination unit 23 also performs precoding for each transmission data based on precoding matrix information (PMI: Precoding Matrix Indicator) and rank information (RI: Rank Indicator) included in the updated channel information. Determine the weight.
- PMI Precoding Matrix Indicator
- RI Rank Indicator
- the antenna configuration and the determination result of the UE pair determination unit 23 are supplied to the MIMO switching unit 24, the resource allocation control unit 25, and the precoding weight control unit 26.
- the resource allocation control unit 25 changes the mapping of the antenna unit (antenna port) 12 according to the determined antenna configuration, thereby appropriately grouping the antenna ports and setting the determined antenna configuration. Thereby, transmission data to each user is transmitted from each antenna unit 12 with an optimal antenna configuration.
- FIG. 14 is a schematic configuration diagram of the mobile station device 40.
- a signal transmitted from the eNB 10 is received by each antenna unit 42 of the mobile station device 40, input to the RF reception circuit 44 via the corresponding duplexer 43, and converted into a baseband signal.
- the CP is removed by the cyclic prefix (CP) removal unit 45 and subjected to the fast Fourier transform by the FFT unit 46
- the signal addressed to the mobile station device 40 is extracted from the received signal by the signal separation unit 47. It is.
- the data channel signal is demodulated by the data demodulator 48 and decoded at the subsequent stage to extract the received data.
- the CSI-RS received from the eNB 10 is input to the channel estimation unit 50 and channel estimation is performed.
- the control channel demodulator 51 demodulates the control signal addressed to the mobile station device 40 using the channel estimation value.
- the channel quality measurement unit 52 measures the reception quality of the downlink channel based on the demodulated control signal.
- the channel quality measurement unit 52 may select PMI and RI based on the measurement result.
- the channel quality measurement result is supplied to the CSI feedback signal generation unit 55 and the MIMO switching unit 54.
- the CSI feedback signal generation unit 55 generates a CSI feedback signal that notifies the eNB 10 of the channel quality (CQI) measured by the channel quality measurement unit 52.
- the CSI feedback signal may include PMI and RI.
- the location information measurement unit 49 measures the location information of the UE 40.
- the position information may include a moving speed, a moving direction, and the like in addition to the current position of the UE 40.
- the measurement result is added to the transmission data by the position information adding unit 53.
- the transmission data and position information are channel coded by the channel coding unit 57a and data modulated by the data modulating unit 57b.
- the channel coding rate and the modulation scheme are determined by the MIMO switching unit 54 according to the MIMO propagation status.
- the transmission data that has been subjected to channel coding and data modulation is mapped together with a reference signal to subcarriers assigned by a scheduler (not shown) by a subcarrier mapping unit 58.
- the mapped transmission data is multiplied by the precoding weight in the precoding multiplication unit 59, and weighted for each antenna unit.
- the precoding weight for uplink may be notified from the eNB 10 to the UE through the downlink control channel.
- the transmission data and the CSI feedback signal are combined by a multiplexer (MUX) 60 to generate transmission data for each antenna unit 42.
- the transmission signal is subjected to inverse Fourier transform by the IFFT unit 61 for each antenna unit 42, addition of a cyclic prefix by the CP adding unit 62, and conversion to a radio frequency by the RF transmission circuit 63, and each antenna unit 42 via the duplexer 43. Sent from
- FIG. 15 shows a scheduling method including determination of the antenna configuration of the second embodiment.
- uplink scheduling will be described.
- the UE 40 transmits an uplink reference signal at a predetermined time interval for each antenna port (or antenna group) and for each predetermined frequency unit.
- the uplink reference signal is, for example, a sounding reference signal (SRS).
- the eNB 10 receives the SRS for each UE 40 and generates channel state information (CSI) including the reception quality of the uplink channel.
- CSI channel state information
- the eNB 10 sets one UE or two or more UE pairs for each uplink resource (for each resource block, for each channel, etc.) based on the estimated CSI and the position information of each UE 40. And an antenna configuration to be assigned to the UE (or UE pair). Specific processing of this step will be described later.
- the position information of the UE 40 may be received from the UE 40 or may be estimated by the eNB 10.
- the eNB 10 transmits the allocation information to each UE 40 through the PDCCH based on the determined allocation information.
- each UE 40 transmits the uplink resource (for example, RB) allocated from the eNB 10 using the notified antenna configuration, and the eNB 10 demodulates the received data.
- the uplink resource for example, RB
- FIG. 16 is an example of a processing flow when determining the antenna configuration and the UE pair in S303 of FIG.
- the eNB 10 calculates the ratio of the instantaneous received power and the average received signal power from each UE 40 for each uplink RB, and selects the UE with the highest ratio (this is referred to as “UE1”) ( Proportional fairness).
- UE1 Proportional fairness
- the UE1 candidate (i is the total number of antenna configurations, i> 0 is an integer of i> 0) is determined based on the antenna configuration selection method shown in FIG.
- One UE (UE2i) that is an optimal pair candidate is selected from the other UEs except for. This eliminates the need for verifying channel orthogonality with UE1 and all other UEs except UE1.
- the orthogonality between the UE pair candidate UE1 and UE2i is calculated for each antenna configuration.
- the antenna configuration j with high orthogonality is selected from the i antenna configurations, and UE2 (UE2j) with high orthogonality is finally selected as a pair, and the antenna configuration j in the RB is selected. decide.
- S401 to S403 are repeated for all RBs, and the process is terminated. Thereby, when scheduling with respect to UE40, an optimal antenna structure can be selected, without increasing a processing amount.
- the antenna configuration can be selected together with scheduling according to the user location information.
- FIG. 17 shows a scheduling method including determination of the antenna configuration of the third embodiment.
- the third embodiment is a modification of the downlink radio resource RB allocation and beamforming of the first embodiment, and the same steps as those of the first embodiment are denoted by the same reference numerals.
- step S101 the eNB 10 transmits a downlink reference signal such as CSI-RS at a predetermined time interval for each antenna port (or antenna group) and for each predetermined frequency unit.
- a downlink reference signal such as CSI-RS
- each UE 40 receives the CSI-RS and generates CSI including the reception quality of the downlink channel.
- the generated CSI is transmitted to the eNB 10 through the uplink control channel together with the position information of the UE 40.
- the eNB 10 collects in advance the location information of the UE 40 that is in the area and the data of the orthogonality between the UEs for each antenna configuration, and stores them in a database, for example, in a table format.
- the eNB 10 refers to the table based on the CSI and the UE location information notified from the plurality of UEs 40, and assigns the UE pair to which the RB is assigned for each downlink radio resource block RB, and the antenna to be assigned to the UE pair. Decide together with the configuration.
- the eNB 10 In S104, the eNB 10 generates a PDCCH, a PDSCH, and a precoding weight based on the determined allocation information. A control signal and a data signal addressed to each UE 40 are transmitted on the PDCCH and the PDSCH, respectively, by the directional beam formed by the precoding weight. Even when scheduling a single user, by collecting user location information for each antenna configuration in advance, an antenna configuration that is highly robust with respect to the user's moving direction, moving speed, etc. can be allocated to resources. You can choose at the same time.
- FIG. 18 is a specific processing flow when determining the antenna configuration and the UE pair in S504 of FIG.
- the eNB 10 calculates the ratio of the instantaneous received power and the average received signal power of each UE 40 for each RB, and selects the UE having the maximum ratio (this is referred to as “UE1”) (proportional fairness). .
- UE1 the UE having the maximum ratio
- step S602 for each antenna configuration candidate, an optimal pair candidate UE (UE2i) is selected from the positional relationship with UE1 with reference to a table (database). Further, the antenna configuration having the highest orthogonality is determined from the antenna configuration candidates with reference to the table, and the combination of UE1 and UE2 and the antenna configuration at this time are determined in combination.
- UE2i an optimal pair candidate UE
- FIG. 19 shows a scheduling method including determination of the antenna configuration of the fourth embodiment.
- the distribution of the UE 40 is taken into account when performing downlink scheduling together with determination of the antenna configuration.
- step S101 the eNB 10 transmits a downlink reference signal such as CSI-RS at a predetermined time interval for each antenna port (or antenna group) and for each predetermined frequency unit.
- a downlink reference signal such as CSI-RS
- each UE 40 receives the CSI-RS and generates CSI including the reception quality of the downlink channel.
- the generated CSI is transmitted to the eNB 10 through the uplink control channel together with the position information of the UE 40.
- the eNB 10 obtains the distribution of the UEs 40 located from the location information notified from each UE 40, and determines the antenna configuration for each radio resource block RB based on the CSI from each UE 40 and the distribution of the UEs 40 located. Determine and assign one or more UE pairs to be combined.
- the eNB 10 In S104, the eNB 10 generates a PDCCH, a PDSCH, and a precoding weight based on the determined allocation information.
- FIG. 20 shows a specific processing flow when determining the antenna configuration and the UE pair in combination in S703 of FIG.
- the eNB 10 determines antenna configuration candidates based on the relationship shown in FIG. The relationship between the UE 40 distribution and the antenna configuration will be described later.
- the ratio of instantaneous received signal power of each UE is calculated in each RB, and the maximum UE (this is referred to as “UE1”) is selected (proportional fairness).
- the optimal pair candidate UE (referred to as “UE2i”) is selected from the positional relationship with UE1, and the orthogonality is calculated.
- UE2 of antenna configuration j having high orthogonality with UE1 is selected from UE2i as a UE pair to which the resource block is assigned, and antenna configuration j at this time is determined as an antenna configuration to be assigned to the UE pair.
- S802 to S804 are repeated for all RBs, and the process is terminated.
- FIG. 21 is a diagram illustrating an example of the relationship between UE distribution and antenna configuration.
- the horizontal axis indicates the distribution density of the UE 40 in the horizontal direction (circumferential direction or tangential direction). The UE's partial density in the horizontal direction becomes sparser as it goes to the right side of the page.
- the vertical axis represents the distribution density of the UE 40 in the vertical direction (the depression angle direction or the cell radial direction). The distribution density becomes sparser toward the upper side of the page.
- the antenna configuration 1 (horizontal array configuration) can be applied.
- the distribution density of the UEs 40 is increased to some extent in the horizontal direction, it is effective to increase the group spacing in the horizontal direction to, for example, about several wavelengths to obtain a horizontal diversity configuration.
- FIG. 22 shows a multimode antenna 71 having another element arrangement.
- the multimode antenna 71 has 16 physical antenna elements in the horizontal direction and the vertical direction, and each element can support vertical polarization and horizontal polarization. Therefore, it is a multimode antenna with (16 ⁇ 16 ⁇ 2) elements.
- the above-described antenna configurations 1 to 3 and the horizontal diversity configuration can be set by grouping at an arbitrary group interval.
- the downlink reference signal can be transmitted not for each antenna port but for each branch in which antenna ports are grouped.
- FIG. 23 shows another example of the relationship between the location information of the UE 40 and the antenna configuration.
- antenna ports are grouped continuously. At that time, it is not always necessary to use all the antenna elements. For example, grouping is performed so that the horizontal interval between antenna groups decreases as the angular difference between UE1 and UE2i increases, or as the moving speed in the vertical direction (elevation angle direction) increases. May be. Similarly, even when grouping is performed such that the vertical gap between the antenna port groups decreases as the angle difference between the UE1 and UE2i in the vertical direction (elevation angle direction) increases or the moving speed in the horizontal direction increases. Good.
- a user pair with high orthogonality is assigned to each resource block, but the user pair may be determined by an appropriate method for each arbitrary resource. Further, not only scheduling for a plurality of users but also scheduling for a single user can be determined by combining the allocation of users to resources and the antenna configuration to be used.
- phase difference information between antenna ports of uplink signals from the UE may be used.
- the user location information is not necessarily acquired by the UE and notified to the eNB, and may be estimated by the eNB using an uplink signal. Moreover, when acquiring positional information with UE, GPS data may be used and distance data from eNB may be used.
- angle difference information between uplink UEs may be used as position information or instead of position information.
- the number of ranks may be selected according to the antenna configuration.
- the arrangement of the physical antenna elements is not limited to the horizontal direction and the vertical direction, and the present invention can also be applied to a three-dimensional 3D arrangement only in the vertical direction, only in the horizontal direction.
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Abstract
Description
複数の異なるアンテナ構成を有するマルチモードアンテナと、
ユーザ装置の位置情報または前記ユーザ装置から送信される信号のアンテナポート間での位相差情報の少なくとも一方と、前記ユーザ装置のチャネル情報と、を取得する取得部と、
前記取得された情報に基づいて、前記ユーザ装置に対するスケジューリングを前記ユーザ装置に割当てる前記アンテナ構成と組み合わせて決定する決定部と、
を有する。
<その他の実施例>
図22は、別の素子配列を有するマルチモードアンテナ71を示す。マルチモードアンテナ71は、水平方向と垂直方向に16ずつの物理的なアンテナ素子を有し、各素子が垂直偏波と水平偏波に対応可能である。したがって、(16×16×2)素子のマルチモードアンテナである。
Claims (10)
- 複数の異なるアンテナ構成を有するマルチモードアンテナと、
ユーザ装置の位置情報または前記ユーザ装置から送信される信号のアンテナポート間の位相差情報の少なくとも一方と、前記ユーザ装置のチャネル情報とを取得する取得部と、
前記取得された情報に基づいて、前記ユーザ装置に対するスケジューリングを、前記ユーザ装置に割当てる前記アンテナ構成と組み合わせて決定する決定部と、
を有することを特徴とする無線基地局装置。 - 前記決定部の決定に基づいて、前記アンテナポートのグルーピングを制御して前記アンテナ構成を設定するリソース割当制御部、
をさらに有することを特徴とする請求項1に記載の無線基地局装置。 - 前記決定部は、前記ユーザ装置の水平方向の移動速度、垂直方向の移動速度、他のユーザ装置との間の水平方向の角度差、他のユーザ装置との間の垂直方向の角度差、移動方向、前記無線基地局装置に接続されているユーザ装置の分布、の少なくともひとつに基づいて、前記ユーザ装置と前記アンテナ構成の組み合わせを決定することを特徴とする請求項1に記載の無線基地局装置。
- 前記決定部は、前記取得した情報に基づいて、任意の無線リソースについて前記ユーザ装置と他のユーザ装置とのペアを決定するとともに、前記ペアに対して割り当てる前記アンテナ構成を決定し、
前記アンテナ構成は、前記アンテナポートを不均一に、または一部のアンテナポートを共用してグループ化することで設定され、
前記マルチモードアンテナで、前記第ユーザ装置と、前記他のユーザ装置に対して異なるビーム幅のビームを形成することを特徴とする請求項1に記載の無線基地局装置。 - 前記無線基地局装置に接続されているユーザ装置の前記位置情報又は前記位相差情報を前記アンテナ構成ごとにあらかじめ格納するテーブル、
をさらに有し、
前記決定部は、前記テーブルを参照し、前記取得した位置情報又は位相差情報から、任意の無線リソースについて前記ユーザ装置と、前記ユーザ装置に割り当てられる前記アンテナ構成とを決定する、
ことを特徴とする請求項1に記載の無線基地局装置。 - 複数の異なるアンテナ構成を有するマルチモードアンテナを備えた基地局で、ユーザ装置の位置情報または前記ユーザ装置から送信される信号のアンテナポート間の位相差情報の少なくとも一方と、前記ユーザ装置のチャネル情報とを取得し、
前記基地局にて、前記取得された情報に基づいて、前記ユーザ装置に対するスケジューリングを、前記ユーザ装置に割り当てる前記アンテナ構成と組み合わせて決定する、
ことを特徴とするスケジューリング方法。 - 前記決定されたアンテナ構成に基づいて、前記アンテナポートを可変のグループ間隔でグループ化することで前記アンテナ構成を設定する、
ことを特徴とする請求項6に記載のスケジューリング方法。 - 前記ユーザ装置と前記アンテナ構成の組合せは、前記ユーザ装置の水平方向の移動速度、垂直方向の移動速度、他のユーザ装置との間の水平方向の角度差、他のユーザ装置との間の垂直方向の角度差、移動方向、前記無線基地局装置に接続されているユーザ装置の分布の少なくともひとつに基づいて決定されることを特徴とする請求項6に記載のスケジューリング方法。
- 前記スケジューリングの決定は、前記取得した情報に基づいて、任意の無線リソースについて前記ユーザ装置と他のユーザ装置とのペアを決定するとともに、前記ペアに対して割当てる前記アンテナ構成を決定し、
前記アンテナ構成は、前記アンテナポートを、不均一に、または一部のアンテナポートを共用してグループ化することで設定され、
前記マルチモードアンテナで、前記ユーザ装置と、前記他のユーザ装置に対して異なるビーム幅のビームを形成する、
ことを特徴とする請求項6に記載のスケジューリング方法。 - 前記基地局に接続されているユーザ装置の前記位置情報又は前記位相差情報を、前記アンテナ構成ごとにあらかじめ格納し、
前記格納された情報を参照して、前記取得した位置情報又は前記位相差情報から、任意の無線リソースについて前記ユーザ装置と、前記ユーザ装置に対して割り当てる前記アンテナ構成とを決定する、
ことを特徴とする請求項6に記載のスケジューリング方法。
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