WO2012086734A1 - 基地局装置、移動端末装置、及び通信制御方法 - Google Patents
基地局装置、移動端末装置、及び通信制御方法 Download PDFInfo
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- WO2012086734A1 WO2012086734A1 PCT/JP2011/079744 JP2011079744W WO2012086734A1 WO 2012086734 A1 WO2012086734 A1 WO 2012086734A1 JP 2011079744 W JP2011079744 W JP 2011079744W WO 2012086734 A1 WO2012086734 A1 WO 2012086734A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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 a base station apparatus, a mobile terminal apparatus, and a communication control method in a next-generation mobile communication system.
- Non-patent Document 1 In the UMTS (Universal Mobile Telecommunications System) network, WSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access) are adopted for the purpose of improving frequency utilization efficiency and data rate.
- the system features based on CDMA (Wideband Code Division Multiple Access) are maximally extracted.
- LTE Long Term Evolution
- Non-patent Document 1 Non-patent Document 1
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE-A LTE Advanced
- CRS Cell-specific Reference Signal
- This CRS is used for demodulation of transmission data, downlink channel quality (CQI: Channel Quality Indicator) measurement for scheduling and adaptive control, and average downlink propagation path for cell search and handover. Used for state measurement (mobility measurement).
- CQI Channel Quality Indicator
- CSI-RS Channel State Information-Reference Signal
- CSI-RS Channel State Information-Reference Signal
- the existence ratio (density) in a predetermined period is set lower than the RS used for data demodulation and the like.
- further improvement in measurement accuracy is required by increasing the presence ratio of reference signals such as CSI-RS.
- the present invention has been made in view of the above points, and provides a base station device, a mobile terminal device, and a communication control method capable of appropriately transmitting and receiving a reference signal even when the presence ratio of the reference signal in a predetermined cycle is increased.
- the purpose is to provide.
- the base station apparatus of the present invention includes a first mobile terminal apparatus capable of receiving a reference signal for channel state measurement, and the reference signal set to have a lower presence ratio in a predetermined period than the first mobile terminal apparatus To the second mobile terminal device capable of receiving the reference signal, the base station device transmitting the reference signal to the mutable reference signal resource defined for transmitting the reference signal.
- a reference signal allocating unit that allocates the reference signal at a presence ratio that can be received by the mobile terminal device, and a resource to which the reference signal is allocated is notified to the first mobile terminal device, and the second mobile
- the terminal device includes a reference signal notification unit that notifies a part of resources as resources to be muted when notifying the resource to which the reference signal is allocated.
- the first mobile terminal apparatus can receive a reference signal assigned at a high presence rate in a predetermined period and measure the channel state with high accuracy.
- the second mobile terminal apparatus can measure the channel state by ignoring the reference signal of the muted resource among the reference signals allocated at a presence ratio that can be received by the first mobile terminal apparatus. Therefore, the second mobile terminal apparatus is not affected by the increase of the reference signal. Thus, even when the presence ratio of the reference signal in the predetermined cycle is increased, the reference signal can be appropriately transmitted / received.
- CSI-RS is a reference signal used for CSI measurement such as CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), etc. as a channel state.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- RI Rank Indicator
- CSI-RS is assigned at a predetermined period, for example, 10 subframe periods.
- the CSI-RS is specified by parameters such as position, sequence, and transmission power.
- the CSI-RS position includes a subframe offset, a period, and a subcarrier-symbol offset (index).
- CSI-RS is a single resource block defined by LTE, in which control signals such as PDCCH (Physical Downlink Control Channel), user data such as PDSCH (Physical Downlink Shared Channel), CRS (Cell-specific Reference Signal) and DM- Assigned so as not to overlap with other reference signals such as RS (Demodulation-Reference Signal).
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- CRS Cell-specific Reference Signal
- DM- Assigned so as not to overlap with other reference signals
- One resource block includes 12 subcarriers continuous in the frequency direction and 14 symbols continuous in the time axis direction. From the viewpoint of suppressing PAPR, two resource elements adjacent in the time axis direction are assigned as a set to resources that can transmit CSI-RS.
- CSI-RS resources reference signal resources
- a CSI-RS pattern is set according to the number of CSI-RS ports (number of antennas).
- one resource element is allocated for CSI-RS per one CSI-RS port.
- the same index is attached to the resource elements constituting one pattern.
- the CSI-RS pattern may be a pattern in which an additional pattern of TDD is added as an option of FDD as shown in FIG. 1D.
- an extended pattern (not shown) obtained by expanding the normal pattern of FDD may be used.
- a normal pattern of FDD will be described as an example for convenience of description.
- measurement accuracy may deteriorate due to data interference from neighboring cells.
- user data is allocated to the downlink resource block of the cell C1 corresponding to the CSI-RS of the adjacent cell C2. Further, user data is allocated to the downlink resource block of the cell C2 corresponding to the CSI-RS of the adjacent cell C1.
- These user data constitute an interference component of CSI-RS in each cell, and become a factor that degrades the CSI measurement accuracy in the mobile terminal apparatus located at the boundary between the cell C1 and the cell C2.
- ⁇ ⁇ ⁇ Muting is being studied to improve the degradation of CSI measurement accuracy due to user data allocation positions.
- user data is not allocated to resources corresponding to CSI-RSs of neighboring cells.
- the downlink resource block of the cell C1 is muted corresponding to the CSI-RS of the cell C2.
- the downlink resource block of the cell C2 is muted corresponding to the CSI-RS of the cell C1.
- This configuration eliminates CSI-RS interference components caused by user data in neighboring cells and improves CSI measurement accuracy in the mobile terminal apparatus.
- it is necessary to notify the mobile terminal device of the muting position because the data channel of the own cell is not transmitted for the adjacent cells. This is because the base station apparatus performs rate matching while avoiding resources to be muted, and the mobile terminal apparatus needs to recognize resources to be muted and perform derate matching. If the mobile terminal apparatus does not recognize the resource to be muted, the demodulation process is also performed on the muted resource, so that the throughput and demodulation accuracy of the demodulation process deteriorate.
- the resource to be muted may be defined as a resource to which no data is allocated, or may be defined as a resource to which data is allocated to the extent that the CSI-RS of the neighboring cell is not interfered. Furthermore, the muted resource may be defined as a resource that is transmitted with a transmission power that does not interfere with the CSI-RS of the neighboring cell.
- the base station apparatus When the base station apparatus notifies muting to the mobile terminal apparatus, it notifies using the CSI-RS pattern.
- the muting may be notified in a bitmap format in which an index (CSI Configuration) numbered in the CSI-RS pattern and the presence / absence of muting are associated one-to-one.
- CSI-RS patterns with different numbers of CSI-RS ports may be used for muting notification and CSI-RS notification.
- FIG. 3 shows an example in which muting is notified using a CSI-RS pattern when the number of CSI-RS ports is four.
- 16-bit bitmap information [0100001000000000] is notified.
- “1” is set for resources to be muted, and “0” is set for resources that are not muted.
- the base station apparatus notifies the mobile terminal apparatus of a transmission cycle (Duty Cycle) and a subframe offset.
- CSI-RS is notified using a CSI-RS pattern when the number of CSI-RS ports is two.
- the base station apparatus notifies the mobile terminal apparatus of resources to which CSI-RS is allocated in addition to muting information.
- the CSI-RS is transmitted in a longer cycle (once in a plurality of subframes) than the CRS as described above.
- one resource element is allocated to one CSI-RS port, and the number of allocated resource elements is smaller than that of CRS or the like. This is because the number of reference signals (density and existence ratio) per radio resource necessary for CSI measurement is set lower than the reference signal necessary for channel estimation used for data demodulation. In this way, since the number of CSI-RSs per radio resource is small, there is a possibility that the mobile terminal device cannot perform sufficient channel estimation when a highly accurate feedback is required from the mobile terminal device in a future system. There is.
- a CSI-RS is assigned to a CSI-RS resource.
- the present inventors have arrived at the present invention in order to solve these problems. That is, the essence of the present invention is to notify a new mobile terminal apparatus of resources to which an additional CSI-RS is allocated together with the existing CSI-RS, and to an existing mobile terminal apparatus by muting. This is to notify the resources to which the existing CSI-RS is allocated, excluding the additional CSI-RS. Thereby, the presence ratio of CSI-RS can be increased without adversely affecting the existing mobile terminal apparatus, and the new mobile terminal apparatus can be made to measure CSI-RS with high accuracy.
- FIG. 5 is a diagram illustrating an example of a signaling method for CSI-RS location information.
- a new mobile terminal device is described as a first mobile terminal device
- an existing mobile terminal device is described as a second mobile terminal device.
- the first mobile terminal device and the second mobile terminal device are assumed to be located in the same cell.
- the existence ratio of CSI-RS in one resource block will be described.
- the existence ratio of CSI-RS in one radio resource may be any, for example, CSI-RS in a plurality of subframes.
- the existence ratio may be replaced with the existence ratio of CSI-RS in one radio frame.
- FIG. 5A shows an example of CSI-RS assignment to the first mobile terminal device.
- 40 resource elements are reserved as CSI-RS resources in one resource block.
- two resource elements are allocated for CSI-RS for one CSI-RS port, and the presence ratio of CSI-RS in one resource block is increased.
- the first mobile terminal apparatus can receive two CSI-RSs for one CSI-RS port within one resource block.
- the base station apparatus notifies all resources to which CSI-RS is allocated to the first mobile terminal apparatus.
- the first mobile terminal apparatus can measure CSI with high accuracy.
- the additional CSI-RS is allocated avoiding the CSI-RS of the adjacent cell in order to suppress inter-cell interference of CSI-RS.
- the location information of CSI-RS between cells may be defined in advance between adjacent base station devices, or may be dynamically changed between adjacent base station devices.
- the second mobile terminal apparatus can receive one CSI-RS per CSI-RS port within one resource block. For this reason, the second mobile terminal apparatus cannot receive all CSI-RSs allocated in the resource block. Therefore, the base station apparatus notifies the second mobile terminal apparatus of resources to which the additional CSI-RS is allocated as muted resources.
- the base station apparatus notifies the second mobile terminal apparatus of resources to which the additional CSI-RS is allocated as muted resources.
- the location information of CSI-RS is notified from the base station apparatus to the mobile terminal apparatus by the first notification method and the second notification method.
- the first notification method is a method in which CSI-RS position information is individually notified from the base station apparatus to the first and second mobile terminal apparatuses.
- the second notification method is a method in which CSI-RS position information is simultaneously notified from the base station apparatus to the first and second mobile terminal apparatuses.
- the base station apparatus individually notifies the first mobile terminal apparatus of CSI-RS position information. Further, the base station apparatus notifies the second mobile terminal apparatus of the muting information instead of the additional CSI-RS position information when individually reporting the position information of the CSI-RS. In this case, the base station apparatus notifies using the CSI-RS pattern described above.
- the base station apparatus may individually notify the first and second mobile terminal apparatuses of the resources on which the CSI-RS is arranged by CSI Configuration indicating the CSI-RS pattern.
- 10 CSI Configurations are used to notify the location information of each CSI-RS.
- the base station apparatus may individually notify the second mobile terminal apparatus of the muting information in the bitmap format described above.
- bitmap information [0000001000000000].
- “1” is set for resources to be muted, and “0” is set for resources that are not muted.
- “0” may be set for muting resources, and “1” may be set for resources that are not muted.
- the bitmap information is composed of 16 bits, it may be composed of 10 bits excluding the additional pattern.
- the base station apparatus adds an additional information when reporting the CSI-RS location information to the first and second mobile terminal apparatuses all at once. Muting information is notified instead of the CSI-RS position information. Further, the base station apparatus individually notifies additional CSI-RS position information only to the first mobile terminal apparatus. In this case, the base station apparatus notifies using the CSI-RS pattern described above.
- the base station apparatus may simultaneously notify the resources where the CSI-RS is arranged to the first and second mobile terminal apparatuses by the CSI Configuration indicating the CSI-RS pattern.
- the base station apparatus may notify the first and second mobile terminal apparatuses of muting information all at once in the bitmap format described above. In this case, the base station apparatus notifies 16-bit bitmap information [0000001000000000] as muting information.
- the base station apparatus may individually notify the first mobile terminal apparatus of resources in which the additional CSI-RS is arranged by using the CSI Configuration indicating the CSI-RS pattern.
- the base station apparatus sets the transmission cycle (Duty Cycle), the subframe offset, and the like in addition to the resources in which the CSI-RS is arranged and the muting resources.
- the location information of the CSI-RS may be notified by higher layer signaling, or may be notified by a broadcast channel, a control channel, and a data channel.
- the base station apparatus may notify CSI-RS position information to the first and second mobile terminal apparatuses in a bitmap format. Further, the base station apparatus may notify the first and second mobile terminal apparatuses of muting information by CSI Configuration indicating a CSI-RS pattern.
- the first mobile terminal device is not limited to a new mobile terminal device, and may correspond to CSI-RS transmitted at a high presence rate in one radio resource, and may be, for example, an existing mobile terminal device.
- the second mobile terminal apparatus is not limited to the existing mobile terminal apparatus, and may correspond to the CSI-RS transmitted at a lower presence ratio than the first mobile terminal apparatus.
- a new mobile terminal apparatus It may be a device.
- FIG. 7 is an explanatory diagram of the system configuration of the wireless communication system according to the present embodiment.
- the wireless communication system shown in FIG. 7 is a system including, for example, an LTE system or SUPER 3G.
- LTE system Long Term Evolution
- SUPER 3G High Speed Downlink Packet Access
- carrier aggregation in which a plurality of fundamental frequency blocks with the system band of the LTE system as a unit is integrated is used.
- this wireless communication system may be called IMT-Advanced or 4G.
- the radio communication system 1 includes base station apparatuses 20A and 20B and a plurality of first and second mobile terminal apparatuses 10A and 10B that communicate with the base station apparatuses 20A and 20B.
- the base station devices 20 ⁇ / b> A and 20 ⁇ / b> B are connected to the higher station device 30, and the higher station device 30 is connected to the core network 40.
- the base station devices 20A and 20B are connected to each other by wired connection or wireless connection.
- the first and second mobile terminal apparatuses 10A and 10B can communicate with the base station apparatuses 20A and 20B in the cells C1 and C2.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- the first and second mobile terminal apparatuses 10A and 10B include an LTE terminal and an LTE-A terminal. In the following description, the description will proceed as the first and second mobile terminal apparatuses unless otherwise specified. For convenience of explanation, it is assumed that the first and second mobile terminal devices 10A and 10B communicate wirelessly with the base station devices 20A and 20B, but more generally the mobile terminal device is also a fixed terminal device.
- User equipment UE: User Equipment
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier-Frequency Division Multiple Access
- the wireless access method is not limited to this.
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single carrier transmission method that reduces interference between terminals by dividing a system band into bands each consisting of one or continuous resource blocks for each terminal, and a plurality of terminals using different bands. .
- the downlink communication channel includes a PDSCH (Physical Downlink Shared Channel) as a downlink data channel shared by the first and second mobile terminal apparatuses 10A and 10B, and a downlink L1 / L2 control channel (PDCCH, PCFICH, PHICH). And have. Transmission data and higher control information are transmitted by the PDSCH. PDSCH and PUSCH scheduling information and the like are transmitted by PDCCH (Physical Downlink Control Channel). The number of OFDM symbols used for PDCCH is transmitted by PCFICH (Physical Control Format Indicator Channel). HARQ ACK / NACK for PUSCH is transmitted by PHICH (Physical Hybrid-ARQ Indicator Channel).
- PDSCH Physical Downlink Shared Channel
- PCFICH Physical Control Format Indicator Channel
- HARQ ACK / NACK for PUSCH is transmitted by PHICH (Physical Hybrid-ARQ Indicator Channel).
- the uplink communication channel has PUSCH (Physical Uplink Shared Channel) as an uplink data channel shared by each mobile terminal apparatus and PUCCH (Physical Uplink Control Channel) as an uplink control channel. Transmission data and higher control information are transmitted by this PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), ACK / NACK, and the like are transmitted by PUCCH.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- Transmission data and higher control information are transmitted by this PUSCH.
- downlink radio quality information CQI: Channel Quality Indicator
- ACK / NACK and the like are transmitted by PUCCH.
- the base station apparatus 20 includes a transmission / reception antenna 201, an amplifier unit 202, a transmission / reception unit (notification unit) 203, a baseband signal processing unit 204, a call processing unit 205, and a transmission path interface 206. Transmission data transmitted from the base station apparatus 20 to the mobile terminal apparatus via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 204 via the transmission path interface 206.
- the downlink data channel signal is transmitted from the RCP layer, such as PDCP layer processing, transmission data division / combination, RLC (Radio Link Control) retransmission control transmission processing, and MAC (Medium Access).
- RCP layer such as PDCP layer processing, transmission data division / combination, RLC (Radio Link Control) retransmission control transmission processing, and MAC (Medium Access).
- Control Retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing are performed.
- transmission processing such as channel coding and inverse fast Fourier transform is performed on the signal of the physical downlink control channel that is the downlink control channel.
- the baseband signal processing unit 204 notifies the mobile terminal apparatus 10 connected to the same cell of the control information for each mobile terminal apparatus 10 to perform wireless communication with the base station apparatus 20 through the broadcast channel.
- the information for communication in the cell includes, for example, system bandwidth in uplink or downlink, and root sequence identification information (Root Sequence) for generating a random access preamble signal in PRACH (Physical Random Access Channel). Index) etc. are included.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
- the amplifier unit 202 amplifies the radio frequency signal subjected to frequency conversion and outputs the amplified signal to the transmission / reception antenna 201.
- a radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202 and is frequency-converted by the transmission / reception unit 203 to be baseband.
- the signal is converted into a signal and input to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, PDCP layer reception processing on transmission data included in the baseband signal received in the uplink I do.
- the decoded signal is transferred to the higher station apparatus 30 via the transmission path interface 206.
- the call processing unit 205 performs call processing such as communication channel setting and release, state management of the base station device 20, and wireless resource management.
- the mobile terminal apparatus 10 includes a transmission / reception antenna 101, an amplifier unit 102, a transmission / reception unit (reception unit) 103, a baseband signal processing unit 104, and an application unit 105.
- a radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102, frequency-converted by the transmission / reception unit 103, and converted into a baseband signal.
- the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 104.
- downlink transmission data is transferred to the application unit 105.
- the application unit 105 performs processing related to layers higher than the physical layer and the MAC layer. Also, the broadcast information in the downlink data is also transferred to the application unit 105.
- uplink transmission data is input from the application unit 105 to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs mapping processing, retransmission control (HARQ) transmission processing, channel coding, DFT processing, and IFFT processing.
- the transmission / reception unit 103 converts the baseband signal output from the baseband signal processing unit 104 into a radio frequency band. Thereafter, the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits it from the transmission / reception antenna 101.
- HARQ retransmission control
- each functional block in FIG. 10 is mainly processing contents of the baseband processing unit. Further, the functional block diagram of FIG. 10 is simplified, and is assumed to have a configuration normally provided in the baseband processing unit.
- base station apparatus 20 includes CSI-RS allocation section 211, CSI-RS location information generation section 212, muting information generation section 213, and CSI-RS parameter generation section 214. And a downlink control signal generation unit 215 and a transmission / reception unit 203.
- the CSI-RS allocation unit 211 allocates CSI-RS to CSI-RS resources according to the number of CSI-RS ports.
- the CSI-RS allocation unit 211 arranges CSI-RSs in two resource elements for one CSI-RS port, and increases the existence ratio of CSI-RSs in one resource block.
- the CSI-RS assigning unit 211 assigns the CSI-RS that can be received by the second mobile terminal apparatus 10B to the CSI-RS so that the measurement accuracy of the first mobile terminal apparatus 10A is increased by adding the CSI-RS.
- the CSI-RS allocation unit 211 acquires CSI-RS position information from the neighboring cell, and allocates an additional CSI-RS while avoiding the CSI-RS of the neighboring cell. Thereby, even when the existence ratio of CSI-RS in one resource block is increased, CSI-RS interference between adjacent cells can be suppressed.
- the CSI-RS position information generation unit 212 generates CSI-RS position information allocated by the CSI-RS allocation unit 211.
- the location information of CSI-RS includes a transmission cycle (Duty Cycle), a subframe offset, and the like in addition to resources to which CSI-RS is allocated. Resources to which CSI-RS is allocated are specified by CSI Configuration, bitmap information, and the like.
- the position information of CSI-RS is input to downlink control signal generation section 215 as one of CSI-RS parameters.
- the muting information generation unit 213 generates muting information indicating that a resource to which an additional CSI-RS is allocated is muted.
- the resource indicated by the muting information is actually assigned CSI-RS and is not muted.
- Bitmap information and CSI Configuration are generated as muting information.
- the muting information is input to the downlink control signal generation unit 215.
- the CSI-RS parameter generation unit 214 generates a CSI-RS sequence, transmission power, and other parameters other than the CSI-RS position information.
- the CSI-RS parameter generated by the CSI-RS parameter generation unit 214 is input to the downlink control signal generation unit 215.
- the downlink control signal generation unit 215 generates a downlink control signal including CSI-RS position information and CSI-RS parameters for the first mobile terminal apparatus 10A. Accordingly, the first mobile terminal apparatus 10A is individually notified of all resources to which CSI-RS is assigned. Also, the downlink control signal generation section 215 generates a downlink control signal including CSI-RS position information, CSI-RS parameters, and muting information for the second mobile terminal apparatus 10B. As a result, the second mobile terminal apparatus 10B is recognized as a resource to which the additional CSI-RS is muted, and a part of receivable CSI-RS resources are individually notified. The transmission / reception unit 203 transmits the CSI-RS and the downlink control signal to the first and second mobile terminal apparatuses 10A and 10B.
- each functional block in FIG. 11 is mainly processing contents of the baseband processing unit. Further, the functional block diagram of FIG. 11 is simplified, and is assumed to have a configuration normally provided in the baseband processing unit.
- the first mobile terminal apparatus 10A includes a transmission / reception unit 103A, an acquisition unit 111A, a measurement unit 112A, and a user data demodulation unit 113A.
- the transceiver 103A receives the CSI-RS and the downlink control signal from the base station device 20.
- the acquiring unit 111A acquires CSI-RS position information and CSI-RS parameters by demodulating the downlink control signal and analyzing the contents of the signal.
- the measuring unit 112A measures CSI from parameters such as CSI-RS position information, series, and transmission power. In this case, since the measurement unit 112A is notified of all resources to which the CSI-RS is allocated from the base station apparatus 20, it can measure the CSI with high accuracy.
- the user data demodulation unit 113A demodulates user data received via the transmission / reception unit 103A.
- the first mobile terminal apparatus 10A may be configured to receive CSI-RS location information and CSI-RS parameters by higher layer signaling.
- the second mobile terminal apparatus 10B includes a transmission / reception unit 103B, an acquisition unit 111B, a measurement unit 112B, and a user data demodulation unit 113B.
- the transmission / reception unit 103B receives the CSI-RS and the downlink control signal from the base station apparatus 20.
- the acquisition unit 111B acquires CSI-RS position information, CSI-RS parameters, and muting information by demodulating the downlink control signal and analyzing the contents of the signal.
- the measuring unit 112B measures CSI from parameters such as CSI-RS position information, series, and transmission power.
- the user data demodulation unit 113B demodulates user data received via the transmission / reception unit 103B. In this case, the user data demodulation unit 113B recognizes the resource to which the additional CSI-RS is assigned as the muted resource based on the muting information notified from the base station device 20. For this reason, the user data demodulation unit 113B does not demodulate the additional CSI-RS, and the throughput and demodulation accuracy of the demodulation process are improved.
- the second mobile terminal apparatus 10B may be configured to receive CSI-RS position information, CSI-RS parameters, and muting information by higher layer signaling.
- each functional block in FIG. 12 is mainly processing contents of the baseband processing unit. Further, the functional block diagram of FIG. 12 is simplified, and is assumed to have a configuration normally provided in the baseband processing unit. In FIG. 12, blocks having the same names as those in FIG.
- base station apparatus 20 includes CSI-RS allocation section 211, CSI-RS location information generation section 212, muting information generation section 213, and CSI-RS parameter generation section 214.
- the CSI-RS allocation unit 211 allocates CSI-RS to CSI-RS resources according to the number of CSI-RS ports.
- the CSI-RS allocation unit 211 arranges CSI-RSs in two resource elements for one CSI-RS port, and increases the existence ratio of CSI-RSs in one resource block.
- the CSI-RS assigning unit 211 assigns the CSI-RS that can be received by the second mobile terminal apparatus 10B to the CSI-RS so that the measurement accuracy of the first mobile terminal apparatus 10A is increased by adding the CSI-RS.
- the CSI-RS allocation unit 211 acquires CSI-RS position information from the neighboring cell, and allocates an additional CSI-RS while avoiding the CSI-RS of the neighboring cell. Thereby, even when the existence ratio of CSI-RS in one resource block is increased, CSI-RS interference between adjacent cells can be suppressed.
- the CSI-RS position information generation unit 212 generates CSI-RS position information allocated by the CSI-RS allocation unit 211.
- the location information of CSI-RS includes a transmission cycle (Duty Cycle), a subframe offset, and the like in addition to resources to which CSI-RS is allocated. Resources to which CSI-RS is allocated are specified by CSI Configuration, bitmap information, and the like.
- the CSI-RS position information is input to the broadcast signal generator 216 and the downlink control signal generator 215 as one of the CSI-RS parameters.
- the muting information generation unit 213 generates muting information indicating that a resource to which an additional CSI-RS is allocated is muted.
- the CSI-RS is actually assigned to the resource indicated by the muting information and is not muted.
- Bitmap information and CSI Configuration are generated as muting information.
- the muting information is input to the downlink control signal generation unit 215.
- the CSI-RS parameter generation unit 214 generates a CSI-RS sequence, transmission power, and other parameters other than the CSI-RS position information.
- the CSI-RS parameter generated by the CSI-RS parameter generation unit 214 is input to the broadcast signal generation unit 216 and the downlink control signal generation unit 215.
- the broadcast signal generation unit 216 gives the CSI-RS position information, CSI-RS parameters, and additional CSI-RS that can be received by the second mobile terminal apparatus 10B to the first and second mobile terminal apparatuses 10A and 10B.
- a notification signal is generated including muting information for the RS.
- the additional CSI-RS is recognized as a resource to be muted for the first and second mobile terminal apparatuses 10A and 10B, and a part of the CSI-RS resources are notified all at once.
- the downlink control signal generation unit 215 generates a downlink control signal including additional CSI-RS position information and CSI-RS parameters for the first mobile terminal apparatus 10A. Thereby, the first mobile terminal apparatus 10A can recognize the CSI-RS of the resource to be muted.
- the transmission / reception unit 203 transmits the CSI-RS and the downlink control signal to the first and second mobile terminal apparatuses 10A and 10B.
- each functional block in FIG. 13 is mainly the processing content of the baseband processing unit. Further, the functional block diagram of FIG. 13 is simplified, and is assumed to have a configuration normally provided in the baseband processing unit. In FIG. 13, blocks having the same names as those in FIG.
- the first mobile terminal apparatus 10A includes a transmission / reception unit 103A, an acquisition unit 111A, a measurement unit 112A, and a user data demodulation unit 113A.
- the transceiver 103A receives the CSI-RS, the broadcast signal, and the downlink control signal from the base station device 20.
- the acquiring unit 111A demodulates the broadcast signal and analyzes the content of the signal, so that the CSI-RS location information, CSI-RS parameters, and additional CSI-RS mues that can be received by the second mobile terminal apparatus 10B are obtained. Get information Further, the acquiring unit 111A acquires additional CSI-RS position information and CSI-RS parameters by demodulating the downlink control signal and analyzing the contents of the signal. Thereby, the first mobile terminal apparatus 10A recognizes that the CSI-RS is allocated to the resource indicated by the muting information.
- the measuring unit 112A measures CSI from parameters such as CSI-RS position information, series, and transmission power. In this case, since the measurement unit 112A is notified of all resources to which the CSI-RS is allocated from the base station apparatus 20, it can measure the CSI with high accuracy.
- the user data demodulation unit 113A demodulates user data received via the transmission / reception unit 103A.
- the first mobile terminal apparatus 10A may be configured to receive CSI-RS location information and CSI-RS parameters by higher layer signaling.
- the second mobile terminal apparatus 10B includes a transmission / reception unit 103B, an acquisition unit 111B, a measurement unit 112B, and a user data demodulation unit 113B.
- the transmission / reception unit 103B receives the CSI-RS and the broadcast signal from the base station apparatus 20.
- the acquisition unit 111B demodulates the broadcast signal and analyzes the contents of the signal, so that the CSI-RS location information, CSI-RS parameters, and additional CSI-RS mues that can be received by the second mobile terminal apparatus 10B are obtained. Get information
- the measuring unit 112B measures CSI from parameters such as CSI-RS position information, series, and transmission power.
- the user data demodulation unit 113B demodulates user data received via the transmission / reception unit 103B. In this case, the user data demodulation unit 113B recognizes the resource to which the additional CSI-RS is assigned as the resource to be muted based on the muting information notified from the base station device 20. For this reason, the user data demodulation unit 113B does not demodulate the additional CSI-RS, and the throughput and demodulation accuracy of the demodulation process are improved.
- the second mobile terminal apparatus 10B may be configured to receive CSI-RS position information, CSI-RS parameters, and muting information by higher layer signaling.
- the first mobile terminal apparatus 10A receives all CSI-RSs allocated with a high presence ratio in one radio resource, and has high accuracy. Can measure the channel condition. Also, the second mobile terminal device 10B ignores the CSI-RS of the muted resource among the CSI-RSs allocated at a presence ratio that can be received by the first mobile terminal device 10A, and changes the channel state. It can be measured. Therefore, the second mobile terminal apparatus is not affected by the increase in the CSI-RS existence ratio. As described above, when the first mobile terminal apparatus 10A and the second mobile terminal apparatus 10B coexist, the CSI-RS can be appropriately transmitted and received.
- the first and second notification methods are exemplified, but the CSI-RS location information notification method is not limited to this.
- the CSI-RS position information notification method the first mobile terminal apparatus is notified of all resources to which the CSI-RS is allocated, and the second mobile terminal apparatus is notified of the CSI-RS. Any method may be used as long as it is a method of notifying some resources as resources to be muted when notifying the allocated resources.
- the acquisition unit acquires the CSI-RS position information, muting information, and CSI-RS parameters in the mobile terminal apparatus.
- the present invention is not limited to this configuration.
- the CSI-RS position information, muting information, and CSI-RS parameters may be acquired by a functional block other than the acquisition unit, for example, a measurement unit or a user data demodulation unit.
- the CSI-RS is exemplified as the reference signal, but the present invention is not limited to this.
- the reference signal may be any signal used for channel state measurement.
- the CSI only needs to include at least one of CQI, PMI, and RI.
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- the CSI-RS setting position, the muting setting position, the number of processing units, the processing procedure, the number of CSI-RSs, and the number of mutings in the above description are appropriately changed without departing from the scope of the present invention.
- Other modifications can be made without departing from the scope of the present invention.
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Abstract
Description
下りリンクの通信チャネルは、第1、第2の移動端末装置10A、10Bで共有される下りデータチャネルとしてのPDSCH(Physical Downlink Shared Channel)と、下りL1/L2制御チャネル(PDCCH、PCFICH、PHICH)とを有する。PDSCHにより、送信データ及び上位制御情報が伝送される。PDCCH(Physical Downlink Control Channel)により、PDSCHおよびPUSCHのスケジューリング情報等が伝送される。PCFICH(Physical Control Format Indicator Channel)により、PDCCHに用いるOFDMシンボル数が伝送される。PHICH(Physical Hybrid-ARQ Indicator Channel)により、PUSCHに対するHARQのACK/NACKが伝送される。
Claims (7)
- チャネル状態の測定用の参照信号を受信可能な第1の移動端末装置と、前記第1の移動端末装置よりも所定周期における存在割合が低く設定された前記参照信号を受信可能な第2の移動端末装置とに対し、前記参照信号を送信する基地局装置であって、
前記参照信号の送信用に規定されたミューティング可能な参照信号用リソースに、前記第1の移動端末装置が受信可能な存在割合で前記参照信号を割り当てる参照信号割当部と、
前記第1の移動端末装置に対しては、前記参照信号が割り当てられるリソースを通知し、前記第2の移動端末装置に対しては、前記参照信号が割り当てられるリソースを通知する際に、一部のリソースをミューティングされるリソースとして通知する参照信号通知部とを備えたことを特徴とする基地局装置。 - 前記参照信号通知部は、前記第1の移動端末装置に対しては、前記参照信号が割り当てられるリソースを個別に通知し、前記第2の移動端末装置に対しては、前記参照信号が割り当てられるリソースを個別に通知する際に、一部のリソースをミューティングされるリソースとして通知することを特徴とする請求項1に記載の基地局装置。
- 前記参照信号通知部は、前記第1の移動端末装置及び前記第2の移動端末装置に対して、前記参照信号が割り当てられるリソースを一斉に通知する際に、一部のリソースをミューティングされるリソースとして通知し、前記第1の移動端末装置に対しては、ミューティングされるリソースとして通知されたリソースに前記参照信号が割り当てられることを個別に通知することを特徴とする請求項1に記載の基地局装置。
- 前記参照信号通知部は、ミューティングされるリソースを、前記参照信号用リソースとミューティングされるリソースの設定位置とを対応付けたビットマップ形式で通知することを特徴とする請求項1から請求項3のいずれかに記載の基地局装置。
- 前記第2の移動端末装置に対して前記参照信号用リソースの一部をミューティングされるリソースとして認識させるミューティング情報を生成するミューティング情報生成部を備え、
前記参照信号割当部は、前記第2の移動端末装置によって受信可能に前記参照信号用リソースに前記参照信号を低い存在割合で割り当てると共に、前記参照信号をミューティング情報に示されるリソースに割り当てることで、前記参照信号用リソースに前記参照信号を高い存在割合で割り当てることを特徴とする請求項1に記載の基地局装置。 - チャネル状態の測定に用いられる参照信号を受信可能な他の移動端末装置と共に基地局装置に接続され、前記他の移動端末装置よりも所定周期における存在割合が高く設定された前記参照信号を、前記基地局装置から受信可能な移動端末装置であって、
前記参照信号の送信用に規定されたミューティング可能な参照信号用リソースに、前記他の移動端末装置よりも高い存在割合で前記参照信号を割り当て、前記他の移動端末装置に対しては前記参照信号を割り当てるリソースを通知する際に、一部のリソースをミューティングされるリソースとして通知する前記基地局装置から、前記参照信号が割り当てられるリソースの通知を受ける受信部と、
前記参照信号に基づいて、下りリンクのチャネル状態を測定する測定部とを備えたことを特徴とする移動端末装置。 - チャネル状態の測定に用いられる参照信号を受信可能な第1の移動端末装置と、前記第1の移動端末装置よりも所定周期における存在割合が低く設定された前記参照信号を受信可能な第2の移動端末装置とに対し、前記参照信号を送信する基地局装置の通信制御方法であって、
前記参照信号の送信用に規定されたミューティング可能な参照信号用リソースに、前記第1の移動端末装置が受信可能な存在割合で前記参照信号を割り当てるステップと、
前記第1の移動端末装置に対しては、前記参照信号が割り当てられるリソースを通知し、前記第2の移動端末装置に対しては、前記参照信号が割り当てられるリソースを通知する際に、一部のリソースをミューティングされるリソースとして通知するステップとを含むことを特徴とする通信制御方法。
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CA2822050A CA2822050A1 (en) | 2010-12-22 | 2011-12-21 | Base station apparatus, mobile terminal apparatus and communication control method |
CN201180061747.2A CN103262629B (zh) | 2010-12-22 | 2011-12-21 | 基站装置、移动终端装置,以及通信控制方法 |
KR1020137017318A KR20130132896A (ko) | 2010-12-22 | 2011-12-21 | 기지국장치, 이동단말장치, 및 통신제어방법 |
US13/995,986 US9392520B2 (en) | 2010-12-22 | 2011-12-21 | Base station apparatus, mobile terminal apparatus and communication control method |
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