US20130294277A1 - Radio base station apparatus, mobile terminal apparatus and radio communication method - Google Patents

Radio base station apparatus, mobile terminal apparatus and radio communication method Download PDF

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Publication number
US20130294277A1
US20130294277A1 US13/977,751 US201113977751A US2013294277A1 US 20130294277 A1 US20130294277 A1 US 20130294277A1 US 201113977751 A US201113977751 A US 201113977751A US 2013294277 A1 US2013294277 A1 US 2013294277A1
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information
cell
csi
subframe
muting
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Satoshi Nagata
Tetsushi Abe
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NTT Docomo Inc
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NTT Docomo Inc
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • 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
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • 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—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • 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
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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
    • H04W88/02—Terminal devices
    • 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
    • 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
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to a radio base station apparatus, a mobile terminal apparatus and a radio communication method in a next-generation mobile communication system.
  • UMTS Universal Mobile Telecommunications System
  • W-CDMA Wideband Code Division Multiple Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • CSI-RS Channel State Information-Reference Signal
  • This CSI-RS is multiplexed at a lower density and over a longer period as compared to the CRS (Cell-specific Reference Signal) defined in the LTE system.
  • CRS Cell-specific Reference Signal
  • REs (Resource Elements) of PDSCH Physical Downlink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • CoMP coordinated multi-point transmission/reception
  • the present invention was carried out in view of the foregoing and aims to provide a radio base station apparatus, a mobile terminal apparatus and a radio communication method capable of taking other-cell interference mitigation measures even in consideration of inter-cell coordination like CoMP.
  • the present invention provides a radio base station apparatus comprising: a generating section configured to generate notification information including subframe information of a cell and subframe information of another cell; and a transmitting section configured to transmit the notification information to a mobile terminal apparatus connected to the cell as a connected cell.
  • the present invention further provides a mobile terminal apparatus comprising: a receiving section configured to receive notification information including subframe information of a connected cell and subframe information of another cell; and a channel quality measuring section configured to measure channel quality of the connected cell with use of the subframe information of the connected cell and to measure channel quality of another cell with use of the subframe information of another cell.
  • notification information containing the subframe information of the serving cell and the subframe information of another cell is transmitted from the radio base station apparatus to the mobile terminal apparatus, it is possible for the mobile terminal apparatus to obtain the subframe information of another cell in addition to the subframe information of the serving cell. Therefore, it is possible to take other-cell interference mitigation measures even in consideration of the inter-cell coordination technique like CoMP.
  • FIG. 1 provides diagrams each for explaining a CSI-RS allocation pattern in a resource block
  • FIG. 2 provides diagrams each for explaining muting in CQI measurement using CSI-RSs
  • FIG. 4 is a diagram for explaining CSI-RS transmission/muting of a serving cell and another cell
  • FIG. 6 is a sequence diagram for transmitting notification information in an individual signal
  • FIG. 7 is a diagram for explaining a system configuration of a radio communication system
  • FIG. 8 is a diagram for explaining an overall configuration of a radio base station apparatus
  • FIG. 9 is a diagram for explaining an overall configuration of a mobile terminal apparatus
  • FIG. 11 is a functional block diagram of the mobile terminal apparatus according to the radio communication method.
  • the CSI-RS is a reference signal used in measurement of a channel state (CSI measurement) such as CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator) or RI (Rank Indicator).
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • the CSI-RS is assigned at predetermined intervals, for example, at intervals of 10 subframes.
  • the CSI-RS is specified by parameters of position, sequence and transmission power.
  • the position of the CSI-RS includes a subframe offset, period, subcarrier-symbol offset (index).
  • the CSI-RS is assigned, in one resource block defined in LTE, in such a manner as not to overlap control signals such as PDCCH (Physical Downlink Control CHannel) signals, user data such as PDSCH (Physical Downlink Shared CHannel) signals, other reference signals such as DM-RSs (Demodulation-Reference Signals) and CRSs (Cell-specific Reference Signals).
  • One resource block is composed of 12 consecutive subcarriers in the frequency direction and 14 consecutive symbols in the time axis direction. From the viewpoint of suppression of PAPR (Peak-to-Average Power Ratio), two resource elements adjacent in the time axis direction are assigned in a set as resources capable of transmitting CSI-RSs.
  • CSI-RS resources reference signal resources
  • CSI Configurations selected CSI-RS pattern
  • the measurement accuracy is sometimes deteriorated by data interference from other cells.
  • user data is assigned, in a downlink resource block of the cell C 1 , corresponding to the CSI-RSs of another cell C 2 .
  • user data is assigned, in a downlink resource block of the cell C 2 , corresponding to the CSI-RSs of another cell C 1 .
  • Such user data becomes an interference component for CSI-RSs of each cell, which may cause deterioration of CSI measurement accuracy in a mobile terminal apparatus positioned on the boundary of the cells C 1 and C 2 .
  • muting As illustrated in FIG. 2B , no user data is assigned to the resources corresponding to CSI-RSs of another cell.
  • the downlink resource block of the cell C 1 is subjected to muting corresponding to the CSI-RSs of the cell C 2 .
  • the downlink resource block of the cell C 2 is subjected to muting corresponding to the CSI-RSs of the cell C 1 .
  • a resource subjected to muting may be defined as a resource to which no data is assigned or a resource to which data is assigned as far as it does not cause interference with a CSI-RS of another cell.
  • a resource subjected to muting may be defined as a resource that is transmitted with such transmission power as does not cause interference to a CSI-RS of another cell.
  • muting may be communicated in a bitmap format where there is one-to-one correspondence between an index (CSI configuration) to number a CSI-RS pattern and presence or absence of muting (whether or not to perform muting).
  • notification of muting and notification of CSI-RSs may be performed using CSI-RS patterns that are different in number of CSI-RS ports.
  • FIG. 3 illustrates an example where muting notification is performed using a CSI-RS pattern when the number of CSI-RS ports is 4.
  • 16-bit bitmap information [1100000000000000] is given corresponding to an index of an FDD (Frequency Division Duplex) normal pattern with a TDD (Time Division Duplex) additional pattern.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the radio base station apparatus notifies the mobile terminal apparatus of the bitmap information as well as a transmission cycle (Duty Cycle) and a subframe offset.
  • CSI-RS notification is performed using a CSI-RS pattern where the number of CSI-RS ports is 2.
  • muting is set to muting resources indicated by the bitmap information, excluding resources to which CSI-RSs are assigned.
  • the radio base station apparatus notifies the mobile terminal apparatus of resources to which CSI-RSs are assigned as well as the muting information.
  • a SIB System Information Block
  • MIB Master Information Block
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • CSI-RS transmission/muting may be applied only in consideration of the home cell (cell connecting to a mobile terminal), but, assuming the inter-cell coordination technique, such as CoMP, that is to be studied in LTE Rel-11 or later, the mobile terminal apparatus needs CSI-RS transmission/muting information of not only the home cell but also other cells. Then, in order to take other-cell interference mitigation measures even in consideration of the inter-cell coordination technique such as CoMP, the present inventors have proposed signaling of subframe information of other cells, for example, CSI-RS transmission/muting information.
  • the inter-cell coordination technique such as CoMP
  • subframe information of other cells is not limited to CSI-RS transmission/muting information, but may include other information relating to subframes (for example, information of subframes multiplexed with paging SIBX, MIB and/or synchronization signals) of other cells in consideration of the inter-cell coordination technique.
  • the gist of the present invention is to, in a radio base station apparatus, generate notification information including subframe information of a home cell and subframe information of another cell and transmit the notification information to a mobile terminal apparatus connected to the home cell as a connected cell and in the mobile terminal apparatus, receive the notification information including the subframe information of the connected cell and the subframe information of another cell, measure channel quality of the connected cell using the subframe information of the connected cell and measure channel quality of another cell using the subframe information of another cell, thereby taking other-cell interference mitigation measures even in consideration of the inter-cell coordination technique like CoMP.
  • the subframe information is information about subframes of another cell in consideration of the inter-cell coordination technique, or information for CSI-RS transmission (non-transmission)/muting (CSI-RS/Muting configuration information) and includes information of subframes multiplexed with paging, SIBX, MIB (broadcast information) and/or synchronization signals, if necessary.
  • information of CSI-RS transmission (non-transmission) is information indicating a subframe to transmit a CSI-RS or information indicating a subframe not to transmit a CSI-RS, including a CSI-RS index and a CSI-RS parameter.
  • Muting information is information indicating a subframe to be subjected to muting, including muting resource identification information, muting interval information and muting index.
  • the subframe information of the home cell includes parameters of CSI-RS/muting of the home cell, and paging and broadcast information of the home cell
  • the subframe information of another cell includes paging and broadcast information of another cell.
  • the subframe information of another cell may include parameters of CSI-RS/muting of another cell.
  • the method of transmitting notification information includes (1) a method using an individual signal and (2) a method using a broadcast signal.
  • These transmission methods may be embodied in the following forms of (a) to (d): (a) subframe information of the home cell and subframe information of another cell are transmitted in individual signals, (b) subframe information of the home cell and subframe information of another cell are transmitted in broadcast signals, (c) subframe information of the home cell is transmitted in an individual signal and subframe information of another cell is transmitted in a broadcast signal, and (d) subframe information of the home cell is transmitted in a broadcast signal and subframe information of another cell is transmitted in an individual signal.
  • the mobile terminal apparatus UE transmits a RACH preamble to the radio base station apparatus eNB.
  • the radio base station apparatus eNB transmits a RACH response to the mobile terminal apparatus UE.
  • the mobile terminal apparatus UE transmits RRC CONNECTION REQUEST (Message 3) to the radio base station apparatus eNB.
  • RRC CONNECTION REQUEST message 3
  • the radio base station apparatus eNB transmits RRC CONNECTION SETUP (Message 4) to the mobile terminal apparatus UE.
  • the notification information may be transmitted in broadcast signals.
  • transmission of notification information using broadcast signals means transmission of notification information using subframes multiplexed with SIBX or transmission of notification information using subframes multiplexed with MIB.
  • the mobile terminal apparatus UE When receiving the notification information (CSI-RS/Muting configuration information) transmitted in the above-mentioned method (1) or (2), the mobile terminal apparatus UE performs channel quality measurement based on this notification information. Specifically, the mobile terminal apparatus UE measures channel quality of the connected cell with use of the subframe information of the connected cell and measures channel quality of another cell with use of the subframe information of another cell.
  • the notification information CSI-RS/Muting configuration information
  • the radio base station apparatus eNB obtains the subframe information of another cell from a radio base station apparatus eNB of another cell.
  • the radio base station apparatus eNB can obtain the subframe information of another cell from the radio base station apparatus eNB of another cell via an X2 interface.
  • the mobile terminal apparatus UE can obtain the subframe information of the home cell as well as the subframe information of another cell. Therefore, it is possible to take other-cell consideration of the inter-cell coordination technique like CoMP.
  • FIG. 7 is a diagram for explaining a system configuration of the radio communication system according to the present embodiment.
  • the radio communication system illustrated in FIG. 7 is, for example, an LTE system or a system including SUPER 3G.
  • carrier aggregation is used such that plural fundamental frequency blocks are aggregated into one band, each fundamental frequency block corresponding to the system band of the LTE system.
  • this radio communication system may be called IMT-Advanced or 4G.
  • the radio communication system 1 has base station apparatuses 20 A and 20 B and a plurality of first or second mobile terminal apparatuses 10 A and 10 B which communicate with the radio base station apparatuses 20 A and 20 B.
  • the radio base station apparatuses 20 A and 20 B are connected to an upper station apparatus 30 , which is connected to a core network 40 .
  • the radio base station apparatuses 20 A and 20 B are connected to each other by wire connection or wireless connection.
  • the first and second mobile terminal apparatuses 10 A and 10 B can communicate with the radio base station apparatuses 20 A and 20 B in the cells C 1 and C 2 , respectively.
  • the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME) and so on, but is by no means limited to these.
  • RNC radio network controller
  • MME mobility management entity
  • the first and second mobile terminal apparatuses 10 A and 10 B include LTE terminals and LTE-A terminals. In the following description, these are treated collectively as first and second mobile terminal apparatuses, unless specified otherwise. Besides, for convenience of explanation, it is assumed that it is the first and second mobile terminal apparatuses 10 A and 10 B that perform radio communications with the radio base station apparatuses 20 A and 20 B, but more generally, the mobile terminal apparatus may be user equipment (UE) including a mobile terminal apparatus and a fixed terminal apparatus.
  • UE user equipment
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • OFDMA is a multi-carrier transmission scheme to perform 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 scheme to perform communications by dividing, per terminal, the system band into bands formed with one or continuous resource blocks, and allowing a plurality of terminals to use mutually different bands thereby to reduce interference between terminals.
  • Downlink communication channels include a PDSCH (Physical Downlink Shared CHannel) as a downlink data channel used by the first and second mobile terminal apparatuses 10 A and 10 B on a shared basis and a downlink L1/L2 control channel (PDCCH, PCFICH, PHICH).
  • PDSCH is used to transmit transmission data and higher control information.
  • PDCCH Physical Downlink Control CHannel
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid-ARQ Indicator CHannel
  • ACK/NACK of HARQ for PUSCH is used to transmit ACK/NACK of HARQ for PUSCH.
  • the uplink communication channels include a PUSCH (Physical Uplink Shared CHannel), which is an uplink data channel used by each mobile terminal apparatus on a shared basis, and a PUCCH (Physical Uplink Control CHannel), which is an uplink control channel.
  • PUSCH Physical Uplink Shared CHannel
  • PUCCH Physical Uplink Control CHannel
  • This PUSCH is used to transmit transmission data and higher control information.
  • the PUCCH is used to transmit downlink radio quality information (CQI: Channel Quality Indicator), ACK/NACK, and so on.
  • CQI Channel Quality Indicator
  • the radio base station apparatus 20 has a transmitting/receiving antenna 201 , an amplifying section 202 , a transmitting/receiving section (notifying section) 203 , a baseband signal processing section 204 , a call processing section 205 and a transmission path interface 206 .
  • Transmission data that is transmitted on the downlink from the radio base station apparatus 20 to the mobile terminal apparatus is input into the baseband signal processing section 204 , through the transmission path interface 206 , from the upper station apparatus 30 .
  • a downlink data channel signal is subjected to PDCP layer processing, RLC (Radio Link Control) layer transmission processing such as RLC retransmission control transmission processing and division and coupling of transmission data, MAC (Medium Access Control) retransmission control, including, for example, HARQ transmission processing, scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ transmission processing scheduling, transport format selection, channel coding
  • IFFT inverse fast Fourier transform
  • precoding processing including channel coding and inverse fast Fourier transform.
  • the baseband signal processing section 204 notifies the mobile terminal apparatuses 10 connected to the same cell of control information for allowing each of the mobile terminal apparatuses 10 to wirelessly communicate with the radio base station apparatus 20 , by a broadcast channel.
  • Broadcast information for communication in this cell includes, for example, the uplink or downlink system bandwidth, identification information of a root sequence (root sequence index) for generating random access preamble signals in the PRACH (Physical Random Access CHannel), and so on.
  • the baseband signal output from the baseband signal processing section 204 is subjected to frequency conversion processing into a radio frequency band.
  • the amplifying section 202 amplifies the radio-frequency signal having been subjected to frequency transmitting/receiving antenna 201 .
  • a radio frequency signal that is received in the transmitting/receiving antenna 201 is amplified in the amplifying section 202 , subjected to frequency conversion and converted into a baseband signal in the transmitting/receiving section 203 , and is input to the baseband signal processing section 204 .
  • the baseband signal processing section 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the transmission data included in the baseband signal that is received on the uplink.
  • the decoded signal is transferred to the upper station apparatus 30 through the transmission path interface 206 .
  • the call processing section 205 performs call processing such as setting up and releasing a communication channel, manages the state of the radio base station apparatus 20 and manages the radio resources.
  • the mobile terminal apparatus 10 has a transmitting/receiving antenna 101 , an amplifying section 102 , a transmitting/receiving section (receiving section) 103 , a baseband signal processing section 104 and an application section 105 .
  • a radio frequency signal received in the transmitting/receiving antenna 101 is amplified in the amplifying section 102 , and subjected to frequency conversion and converted into a baseband signal in the transmission/reception section 103 .
  • This baseband signal is subjected to reception processing such as FFT processing, error correction decoding and retransmission control and so on, in the baseband signal processing section 104 .
  • downlink transmission data is transferred to the application section 105 .
  • the application section 105 performs processing related to higher layers above the physical layer and the MAC layer.
  • broadcast information is also transferred to the application section 105 .
  • uplink transmission data is input from the application section 105 to the baseband signal processing section 104 .
  • mapping processing, retransmission control (HARQ) transmission processing, channel coding, DFT processing, IFFT processing and so on are performed.
  • the baseband signal output from the baseband signal processing section 104 is subjected to frequency conversion processing in the transmitting/receiving section 103 and converted into a radio frequency band, and, after that, the frequency-converted radio frequency signal is amplified in the amplifying section 102 and transmitted from the transmitting/receiving antenna 101 .
  • the functional blocks shown in FIG. 10 represent processing substantially performed in the baseband signal processing section. And, the functional blocks shown in FIG. 10 are simplified, and needless to say, the baseband signal processing section is equipped with standard parts. Further, in the following description, it is assumed that an index to identify a resource where CSI-RS is allocated is called CSI-RS index.
  • the radio base station apparatus 20 has a CRS arranging section 207 , a CSI-RS arranging section 208 , a CSI-RS/muting information generating section 210 , and a broadcast signal/individual signal generating section 209 .
  • the CSI-RS/muting information generating section 210 has a CSI-RS index generating section 2101 , a muting resource setting section 2102 , a muting resource identification information generating section 2103 , a CSI-RS parameter generating section 2104 , a muting interval information generating section 2105 and a muting index generating section 2106 .
  • the CRS arranging section 207 allocates CRSs in CRS transmission resources in a resource block.
  • the CSI-RS arranging section 208 allocates CSI-RSs in CSI-RS transmission resources in a resource block in accordance with the number of CSI-RS ports.
  • the CSI-RS index generating section 2101 of the CSI-RS/muting information generating section 210 generates a CSI-RS index corresponding to the resources where the CSI-RSs are allocated by the CSI-RS arranging section 208 .
  • the CSI-RS index generated by the CSI-RS index generating section 2101 is output to the broadcast signal/individual signal generating section 209 as one of CSI-RS parameters.
  • the muting resource setting section 2102 sets resources corresponding to the resources where CSI-RSs are allocated in a neighbor cell, as muting resources.
  • the muting resources may be resources where no data is assigned or may be defined as resources where data is assigned as far as no interference is given to CSI-RSs of the neighbor cell. Further, the muting resources may be resources that are transmitted with such transmission power as does not cause interference to CSI-RSs of the neighbor cell.
  • the muting resource identification information generating section 2103 generates muting resource identification information to be used in the muting notification method.
  • the muting resource identification information includes, for example, bitmap information, muting resource allocation patterns and so on.
  • each resource indicated by the muting resource identification information is recognized as a muting resource at the mobile terminal apparatus 10 side.
  • the muting resource identification information is output to the broadcast signal/individual signal generating section 209 as one of muting parameters.
  • the CSI-RS parameter generating section 2104 generates parameters such as CSI-RS sequence and transmission power other than the CSI-RS index.
  • the CSI-RS parameter generated by the CSI-RS parameter generating section 2104 is output to the broadcast signal/individual signal generating section 209 .
  • the muting interval information generating section 2105 generates muting interval information indicating a subframe transmission interval where CSI-RS transmission timings are matched between cells (muting interval).
  • the muting interval information generating section 2105 generates muting interval information based on a transmission cycle of CSI-RSs obtained from a neighbor cell and a transmission cycle of CSI-RSs of the home cell.
  • the muting interval information generated by the muting interval information generating section 2105 is output to the broadcast signal/individual signal generating section 209 .
  • the muting index generating section 2106 generates a muting resource index.
  • the muting index is transmitted to the mobile terminal apparatus 10 , as a substitute for the muting resource identification information (bitmap information, muting resource arranging pattern).
  • the muting index generated by the muting index generating section 2106 is output to the broadcast signal/individual signal generating section 209 .
  • the broadcast signal/individual signal generating section 209 generates a broadcast signal or an individual signal including the subframe information of the home cell (CSI-RS index, CSI-RS parameter, muting resource identification information, muting interval information, muting index of the home cell, paging information of the home cell (information of subframes multiplexed with paging), broadcast information of the home cell (information of subframes multiplexed with MIB or SIB)) and information of subframes of another cell (paging information of another cell (information of subframes multiplexed with paging) and broadcast information of another cell (information of subframes multiplexed with MIB or SIB).
  • the broadcast signal/individual signal generating section 209 (a) when subframe information of the home cell and subframe information of another cell are transmitted in an individual signal, the individual signal including the subframe information of the home cell and the subframe information of another cell is generated. (b) When subframe information of the home cell and subframe information of another cell are transmitted in a broadcast signal, the broadcast signal including the subframe information of the home cell and the subframe information of another cell is generated. (c) When subframe information of the home cell is transmitted in an individual signal and subframe information of another cell is transmitted in a broadcast signal, the individual signal including the subframe information of the home cell and the broadcast signal including the subframe information of another cell are generated. (d) When subframe information of another cell is transmitted in an individual signal and subframe information of the home cell is transmitted in a broadcast signal, the individual signal including the subframe information of another cell and the broadcast signal including the subframe information of the home cell are generated.
  • the transmitting/receiving section 203 transmits CRS, CSI-RSs and broadcast/individual signals to the mobile terminal apparatus 10 .
  • FIG. 11 is an explanatory view of the functional blocks principally for CQI measurement by the mobile terminal apparatus.
  • the functional blocks shown in FIG. 11 represent processing substantially performed in the baseband signal processing section.
  • the functional blocks shown in FIG. 11 are simplified for explanation of the present invention, and needless to say, the baseband signal processing section is equipped with standard parts.
  • the user data demodulating section 107 demodulates user data received through the transmitting/receiving section 103 .
  • the user data demodulating section 107 ignores the muting resource indicated by the muting resource identification information and demodulates the user data. This contributes to improvement of throughput of demodulation processing and demodulation accuracy.
  • the CSI-RS/muting information obtaining section 106 may perform the demodulation processing of the user data.
  • the CSI-RS/muting information obtaining section 106 demodulates the individual signal and/or broadcast signal to obtain the subframe information of the home cell (home cell CSI-RS index, CSI-RS parameter, muting resource identification information, muting interval information, muting index and home cell paging information (information of subframes multiplexed with paging), home cell broadcast information (information of subframes multiplexed with MIB or SIB)), and other-cell subframe information (paging information of another cell (information of subframes multiplexed with paging) and other-cell broadcast information (information of subframes multiplexed with MIB or SIB)).
  • home cell CSI-RS index, CSI-RS parameter, muting resource identification information, muting interval information, muting index and home cell paging information information of subframes multiplexed with paging
  • home cell broadcast information information of subframes multiplexed with MIB or SIB
  • other-cell subframe information paging information of another cell (
  • the CSI-RS/muting information obtaining section 106 outputs the home cell CSI-RS index, CSI-RS parameter, home cell paging information, and home cell broadcast information to the home cell channel quality measuring section 108 . And, the CSI-RS/muting information obtaining section 106 outputs the muting interval information, muting index, other-cell paging information, and other-cell broadcast information to another cell channel quality measuring section 109 . Note that the CSI-RS/muting information obtaining section 106 outputs muting resource identification information to another cell channel quality measuring section 109 according to necessary.
  • the home cell channel quality measuring section 108 uses the home cell CSI-RS index, CSI-RS parameter, home cell paging information and home cell broadcast information as a basis to measure channel quality of the home cell (connected cell) and obtains a home cell CSI from the measured channel quality.
  • the CSI-RS is not multiplexed in the subframes multiplexed with home cell paging information or home cell broadcast information, it does not measure channel quality and measures channel quality of CSI-RS of another subframe.
  • the home cell channel quality measuring section 108 outputs the home cell CSI information to the transmitting/receiving section 103 .
  • Another cell channel quality measuring section 109 uses the muting interval information, muting index, other-cell paging information and other-cell broadcast information as a basis to measure channel quality of another cell, and obtains an other-cell CSI from the measured channel quality.
  • CSI-RS is not multiplexed in subframes multiplexed with another cell paging information or other-cell broadcast information, it does not measures channel quality but measures channel quality with use of a CSI-RS of another subframe.
  • Another cell channel quality measuring section 109 outputs another cell CSI information to the transmitting/receiving section 103 .
  • the home cell channel quality measuring section 108 and another cell channel quality measuring section 109 may be formed of the same processing section.
  • the notification information (broadcast signal/individual signal) containing the subframe information of the home cell and the subframe information of another cell is generated. Then, this notification information is transmitted in the broadcast signal and/or individual signal to the mobile terminal apparatus UE. In the mobile terminal apparatus UE, the notification information including the subframe information of the connected cell and the subframe information of another cell is received. Next, the channel quality of the connected cell is measured with use of the subframe information of the connected cell and the channel quality of another cell is measured with use of the subframe information of another cell. Therefore, even in consideration of the inter-cell coordination technique like CoMP, it is possible to take other-cell interference mitigation measures.
  • the present invention is not limited to the above-described embodiment and may be embodied in various modified forms.
  • the installation position of a muting resource, the number of processing sections, the processing procedure, the number of muting resources in the above description may be modified as appropriate without departing from the scope of the present invention. Any other modifications may be added as appropriate without departing from the scope of the present invention.

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