WO2011136334A1 - 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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- WO2011136334A1 WO2011136334A1 PCT/JP2011/060379 JP2011060379W WO2011136334A1 WO 2011136334 A1 WO2011136334 A1 WO 2011136334A1 JP 2011060379 W JP2011060379 W JP 2011060379W WO 2011136334 A1 WO2011136334 A1 WO 2011136334A1
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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
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
- H04W16/08—Load shedding arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- LTE Long Term Evolution
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Multiple Access
- 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
- LTE-A (LTE Release 10) is considering a heterogeneous network configuration that emphasizes the local area environment in addition to the conventional cellular environment.
- Heterogeneous network is a hierarchical network in which large cells and small cells are overlaid.
- improvement of the throughput of the entire system is being studied by a range expansion that expands the range of a small cell and connects many mobile terminal devices to the small cell.
- the present invention has been made in view of the above points, and provides a base station apparatus, a mobile terminal apparatus, and a communication control method capable of performing control suitable for interference in a heterogeneous network and corresponding to a next-generation mobile communication system.
- the purpose is to do.
- the base station apparatus of the present invention is a base station apparatus that covers at least a part of a frequency band with another base station apparatus that covers a large cell and covers a small cell, and receives a transmission signal to a mobile terminal apparatus Transmission to the mobile terminal device among mobile terminal devices belonging to the own cell because the power added with the offset is larger than the reception power of the transmission signal from the other base station device to the mobile terminal device.
- a specifying unit that identifies a mobile terminal device that has a larger reception power of a transmission signal from the other base station device than the received power of the signal to the mobile terminal device, and a blank set in a downlink radio frame of the other base station device
- a scheduling unit configured to perform scheduling for the mobile terminal device specified by the specifying unit in association with a resource, That.
- the present invention it is possible to suppress interference received from a large-scale cell for a mobile terminal device connected to a base station apparatus of a small-scale cell by Range expansion. In this way, it is possible to cause the base station apparatus and mobile terminal apparatus of a small cell to perform control suitable for interference in a heterogeneous network having large and small cells.
- FIG. 1 is a diagram for explaining a frequency usage state when mobile communication is performed in the downlink.
- the fundamental frequency block is described as a component carrier. Further, in all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.
- the example shown in FIG. 1 is an LTE-A system, which is a first communication system having a relatively wide first system band composed of a plurality of component carriers, and a relatively narrow (here, one component carrier).
- This is a frequency usage state when an LTE system, which is a second communication system having a second system band (which is configured) coexists.
- wireless communication is performed with a variable system bandwidth of 100 MHz or less, and in the LTE system, wireless communication is performed with a variable system bandwidth of 20 MHz or less.
- the system band of the LTE-A system is at least one fundamental frequency region (component carrier: CC) having the system band of the LTE system as a unit. In this way, widening a band by integrating a plurality of fundamental frequency regions is called carrier aggregation.
- component carrier component carrier
- Mobile terminal apparatus having a system band of 20 MHz (base band).
- HetNet a heterogeneous network
- the HetNet is a hierarchical network in which various types of cells such as a pico cell C1 and a femto cell (small cell) are overlaid in addition to the conventional macro cell C2 (large cell).
- the base station apparatus B2 of the macro cell C2 that covers a relatively large area has a larger downlink transmission power than the base station apparatus B1 of the pico cell C1 that covers a relatively narrow area.
- a range expansion is performed to expand the range of the pico cell C1 by adding an offset to the received power (RSRP: Reference Signal Received Power) from the base station apparatus B1 of the pico cell C1.
- RSRP Reference Signal Received Power
- the base station apparatus B2 of the macro cell C2 notifies the mobile terminal apparatus UE in the own cell of the received power offset.
- the mobile terminal apparatus UE receives this and compares the received power levels of the pico cell C1 and the macro cell C2 according to the following equation (1).
- the RSRP_other cell indicates the received power in the pico cell C1
- the RSRP_serving cell indicates the received power in the macro cell C2.
- the mobile terminal apparatus UE notifies the base station apparatus B2 of the macro cell C2 when the sum of the received power in the pico cell C1 and the offset is larger than the received power in the macro cell C2. . Then, as illustrated on the right side of FIG. 3, the mobile terminal apparatus UE that satisfies Equation (1) performs handover from the macro cell C2 to the pico cell C1.
- the mobile terminal apparatus UE handed over to the pico cell C1 by Range expansion has a problem that it receives strong interference from the macro cell C2 sharing a part of the frequency band with the pico cell C1.
- each mobile terminal apparatus UE-A and UE-B performs cell selection according to the magnitude of received power in the pico cell C1 and macro cell C2. Then, the mobile terminal apparatus UE-A close to the base station apparatus B1 selects the pico cell C1, and the mobile terminal apparatus UE-B slightly away from the base station apparatus B1 selects the macro cell C2.
- the cells are selected by the mobile terminal apparatuses UE-A and UE-B according to the equation (1).
- the range of the pico cell C1 is expanded by an amount corresponding to the offset added to the received power.
- the mobile terminal apparatus UE-A has higher received power in the pico cell C1 than in the macro cell C2
- interference from the macro cell C2 does not matter even if the pico cell C1 is selected.
- the mobile terminal apparatus UE-B selects the pico cell C1 even though the received power in the pico cell C1 is smaller than that of the macro cell C2, it has received strong interference from the macro cell C2.
- the subframe (Duration 1) that does not correspond to the blank period of the macro cell C2 receives interference from the macro cell C2. For this reason, the throughput of the mobile terminal apparatus UE-B has deteriorated for the subframe indicated by Duration. In addition, since interference from the macro cell C2 does not matter for the mobile terminal apparatus UE-A, the throughput is not affected regardless of whether or not the macro cell C2 has a blank period.
- the present inventors came to make the present invention in order to solve the above problems. That is, the gist of the present invention is to allow a base station apparatus of a pico cell to specify a mobile terminal apparatus that has selected a pico cell by Range expansion, and avoid user resources that receive interference from a macro cell with respect to the specified mobile terminal apparatus. Is to assign. With such a configuration, the base station apparatus of the pico cell causes the mobile terminal apparatus that has selected the pico cell without being subjected to the Range expansion to be scheduled in both Durations 1 and 2, and the Mobile terminal apparatus that has selected the pico cell by the Range expansion is Duration. 2 can be scheduled.
- FIG. 6 is an explanatory diagram showing a method of identifying a range expanded mobile terminal apparatus in a pico cell base station apparatus according to an embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing an example of transmission control processing in the picocell base station apparatus according to the present embodiment.
- the portion indicated by the broken line is the range of the pico cell in a state where the range expansion is not performed.
- the mobile terminal apparatus UE-A and the mobile terminal apparatus UE-B belong to the pico cell C1 expanded by the Range expansion.
- the mobile terminal apparatus UE-A is connected to the base station apparatus B1 of the pico cell C1 without being subjected to Range expansion, and the mobile terminal apparatus UE-B is connected to the base station apparatus B1 of the pico cell C1 by Range expansion.
- the base station apparatus B1 specifies the mobile terminal apparatus UE-B connected by the Range expansion among the mobile terminal apparatuses UE-A and UE-B belonging to the own cell.
- the base station apparatus B1 notifies the mobile terminal apparatuses UE-A and UE-B of two types of offsets for specifying the mobile terminal apparatus UE and for handover.
- each mobile terminal apparatus UE-A and UE-B determines whether or not the received power of the macro cell C2 is larger than that of the pico cell C1 by using an expression used for handover measurement as shown in Expression (2). judge. RSRP_other cell> RSRP_serving cell + offset (2)
- RSRP_other cell shows the received power in the macro cell C2
- RSRP_serving cell shows the received power in the pico cell C1, respectively.
- the base station apparatus B1 Based on the notification from each mobile terminal apparatus UE, the base station apparatus B1 identifies the mobile terminal apparatus UE-B connected by Range expansion. Note that each mobile terminal apparatus UE may notify the base station apparatus B1 of the difference between the reception powers of the macro cell C2 and the pico cell C1 instead of the expression (2) being true. Further, the determination as to whether or not the connection has been made by Range expansion may be made when it is determined to be false in the handover determination described later.
- the mobile terminal apparatus UE makes a handover decision using the handover offset.
- each mobile terminal apparatus UE compares the received power in the macro cell C2 with the offset added to the received power in the pico cell C1 with an offset (offset> 0).
- Each of the mobile terminal apparatuses UE-A and UE-B confirms that the expression (2) is true when the received power in the macro cell C2 is larger than the sum of the received power offset in the pico cell C1.
- Equation (2) becomes true, and handover is performed from the pico cell C1 to the macro cell C2.
- the handover determination may be determined when it is determined to be true in the determination of whether or not the connection is made by Range expansion.
- each of the mobile terminal apparatuses UE-A and UE-B based on the two types of offsets notified from the base station apparatus B1 of the picocell C1, it is determined whether or not a connection is made by Range expansion and whether or not to perform handover. Is determined.
- RSRP is used as received power, but RS-SIR (Reference Signal Signal-to-Interference Ratio), RSSI (Received Signal Strength Indicator), RSRQ (Reference Signal Received Quality), etc. are used. May be.
- the base station apparatus B1 of the pico cell C1 identifies the mobile terminal apparatus UE-B connected by the Range expansion
- the base station apparatus B1 schedules downlink radio resources so as to avoid interference from the macro cell C2 with respect to the mobile terminal apparatus UE-B.
- a blank period is provided every other subframe in the downlink radio frame of the macro cell C2.
- This blank period is a period in which interference with the downlink radio frame of the pico cell C1 is suppressed, and blank resources are set except for CRS (Common Reference Signal). It should be noted that the blank period can be changed as appropriate, as long as the configuration is set every other subframe in the downlink radio frame.
- the base station apparatus B1 of the picocell C1 performs scheduling for Duration 2 corresponding to the blank period for the mobile terminal apparatus UE-B connected by the Range expansion. Also, the base station apparatus B1 schedules the durations 1 and 2 for the mobile terminal apparatus UE-A because interference from the macro cell C2 does not become a problem. At this time, the scheduler of the base station apparatus B1 assigns user data to each mobile terminal apparatus UE in resource block units in each subframe. With this configuration, interference from the macro cell C2 with respect to the mobile terminal apparatus UE-B is suppressed.
- the base station apparatus B2 of the macro cell C2 shows an example which set all the frequency blocks of the blank period to the blank resource, it is not limited to this structure.
- Base station apparatus B2 is good also as a structure which sets a one part frequency block in a blank period to a blank resource.
- the blank resource may be a resource to which no data is allocated, or may be defined as a resource to which data is allocated to the extent that no interference is given to the radio frame of the pico cell.
- the blank resource may be defined as a resource that is transmitted with a transmission power that does not interfere with a radio frame of a pico cell.
- the blank period is limited to a configuration that is set every other subframe in the downlink radio frame, and can be changed as appropriate.
- the blank resource may be notified from the base station device B2 of the macro cell C2 to the base station device B1 of the pico cell C1, or when the fixed resource is defined between the base station devices B1 and B2, the notification is not given. It is unnecessary.
- the base station apparatus B1 may be configured to adjust the transmission timing upon receiving signaling from the base station apparatus B2, and vice versa.
- base station apparatus B2 of macro cell C2 is good also as a structure which sets a blank period according to the case where the number of the surrounding pico cells C1 is more than predetermined, or the number of connected mobile terminal apparatuses UE.
- the base station apparatus B1 of the pico cell C1 may be configured to notify the subframe receiving interference from the macro cell C2 to the mobile terminal apparatus UE-B connected by the Range expansion. With this configuration, the mobile terminal apparatus UE-B can demodulate user data while avoiding the subframe of the pico cell C1 that does not correspond to the blank period of the macro cell C2.
- FIG. 8 is an explanatory diagram of the system configuration of the wireless communication system according to the present embodiment.
- the radio communication system shown in FIG. 8 is a system including, for example, an LTE system or SUPER 3G.
- this wireless communication system may be called IMT-Advanced or 4G.
- the wireless communication system is HetNet, and a hierarchical network is constructed by a first system having a macro cell C2 and a second system having a pico cell C1.
- the first system includes a base station apparatus B2 that covers the macro cell C2 and a mobile terminal apparatus UE (only one shown) that communicates with the base station apparatus B2.
- the second system is configured to include a base station apparatus B1 that covers the pico cell C1 and a mobile terminal apparatus UE (only one shown) that communicates with the base station apparatus B1.
- a radio resource is allocated in resource block units for each user by the scheduler.
- the base station devices B1 and B2 are respectively connected to an upper station device (not shown) and are connected to the core network 50 via the upper station device.
- the mobile terminal device performs radio communication with the base station devices B1 and B2, but more generally, a user device (UE: User Equipment) including both the mobile terminal device and the fixed terminal device. )
- UE User Equipment
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- 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 PDSCH as a downlink data channel shared by each mobile terminal apparatus, and downlink L1 / L2 control channels (PDCCH, PCFICH, PHICH).
- PDSCH downlink L1 / L2 control channels
- User data and higher control information are transmitted by the PDSCH.
- PDSCH and PUSCH scheduling information and the like are transmitted by the PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH (Physical Control Format Indicator Channel).
- ACK / NACK of HARQ (Hybrid Automatic Repeat reQuest) 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 device and PUCCH (Physical Uplink Control Channel) as an uplink control channel. User 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
- User 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 that covers the macro cell has the same configuration as that of the pico cell base station apparatus, and thus description thereof is omitted here.
- processing of signals transmitted from the mobile terminal apparatus to the base station apparatus through the uplink is omitted.
- the base station apparatus B1 includes a transmission / reception antenna 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, a call processing unit 205, and a transmission path interface 206.
- User data transmitted from the base station apparatus B1 to the mobile terminal apparatus UE via the downlink is input from the higher station apparatus to the baseband signal processing unit 204 via the transmission path interface 206.
- the downlink data channel signal is processed by the PDCP layer processing, user data division / combination, RLC (Radio Link Control) retransmission control transmission processing such as RLC layer transmission processing, 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. Also, transmission processing such as channel coding and inverse fast Fourier transform is performed on the downlink control channel signal. Further, the baseband signal processing unit 204 notifies the mobile terminal apparatus UE connected to the same cell C1 of the control information for each mobile terminal apparatus UE to perform radio communication with the base station apparatus B1 through the broadcast channel. .
- RLC Radio Link Control
- MAC Medium Access Control
- 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 downlink control channel signal.
- the transmission / reception unit 203 frequency-converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
- the amplifier unit 202 amplifies the transmission signal subjected to frequency conversion and outputs the amplified transmission signal to the transmission / reception antenna 201.
- the overall configuration of the mobile terminal apparatus arranged in the pico cell according to the present embodiment will be described.
- positioned in a macrocell since it is the structure similar to the mobile terminal apparatus of a pico cell, description is abbreviate
- processing of signals transmitted from the mobile terminal apparatus to the base station apparatus through the uplink is omitted.
- the mobile terminal apparatus UE includes a transmission / reception antenna 101, an amplifier unit 102, a transmission / 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 processing unit 104 the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like.
- downlink user 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.
- FIG. 11 is an explanatory diagram of functional blocks for notifying the base station apparatus of the pico cell of connection by Range expansion in the mobile terminal apparatus. Note that each functional block in FIG. 11 is mainly processing contents of the baseband processing unit.
- the mobile terminal apparatus UE includes a received power measurement unit 111, a first determination unit 112, a second determination unit 113, a handover unit 114, and a transmission / reception unit 103.
- the received power measuring unit 111 receives reference signals (RS) from the base station apparatus B1 of the pico cell C1 and the base station apparatus B2 of the macro cell C2, and measures received power for each.
- the first determination unit 112 determines whether or not the received power in the macro cell C2 is larger than the received power in the pico cell C1. Then, the first determination unit 112 indicates that the expression (2) is true when the received power in the macro cell C2 is larger than the received power in the pico cell C1, that is, that the base station apparatus has connected by Range expansion. Notify B1. This determination result may be included in the control signal and notified to the base station apparatus B1 via the control channel (PUCCH), or may be included in the user data and notified to the base station apparatus B1 via the data channel (PUSCH). Note that the first determination unit 112 may be configured to make a determination when the second determination unit 113 determines false.
- the second determination unit 113 compares the received power of the base station apparatuses B1 and B2 by the above equation (2), and determines whether to perform handover. At this time, the second determination unit 113 sets the offset> 0 notified from the base station apparatus B2 to the offset of Expression (2). The second determination unit 113 determines whether or not the received power in the macro cell C2 is greater than the received power in the pico cell C1 plus an offset. Then, the second determination unit 113 indicates that the expression (2) is true when the reception power in the macro cell C2 is larger than the reception power of the pico cell C1 plus an offset, that is, that handover is performed. Output to the handover unit 114. Note that the second determination unit 113 may be configured to make a determination when the first determination unit 112 determines true.
- the handover unit 114 When the determination result of the second determination unit 113 is true, the handover unit 114 notifies the base station apparatus B1 that the handover from the pico cell C1 to the macro cell C2 is performed, and performs the handover.
- the transmission / reception unit 103 performs transmission / reception processing of information transmitted / received between the mobile terminal apparatus UE and the base station apparatus B1.
- FIG. 12 is an explanatory diagram of functional blocks for scheduling processing in the base station apparatus of a pico cell. Note that each functional block in FIG. 12 is mainly processing contents of the baseband processing unit.
- the base station apparatus B1 includes a specifying unit 211, a scheduler 212, an offset generation unit 213, and a transmission / reception unit 203.
- the specifying unit 211 specifies the mobile terminal apparatus UE connected by the Range expansion based on the determination result notified from each mobile terminal apparatus UE in the own cell.
- the scheduler 212 assigns radio resources in units of resource blocks for each user. At this time, the scheduler 212 allocates user data to the resource block corresponding to the blank resource of the downlink radio frame of the macro cell C2 with respect to the mobile terminal apparatus UE specified by the specifying unit 211.
- the offset generation unit 213 generates two types of offsets for specifying the mobile terminal device UE and for handover for each mobile terminal device UE in the own cell.
- the offset for specifying the mobile terminal apparatus UE is set to 0, and the offset for handover is set to a value larger than 0.
- the base station apparatus B1 notifies the mobile terminal apparatus UE of these two types of offsets, thereby causing the mobile terminal apparatus UE to perform two types of determination using a handover measurement.
- the transmission / reception unit 203 performs transmission / reception processing of information transmitted / received between the base station apparatus B1 and the mobile terminal apparatus UE.
- FIG. 13 is a diagram showing a flow of communication control in the wireless communication system according to the present embodiment.
- the mobile terminal apparatus In the initial state, it is assumed that the mobile terminal apparatus is connected to the base station apparatus of the macro cell.
- the base station apparatus B2 notifies the mobile terminal apparatus UE in its own cell (in the macro cell C2) of the offset (step S01).
- the mobile terminal apparatus UE measures the received power of the reference signal received from the base station apparatus B2 of the macro cell C2 and the base station apparatus B1 of the pico cell C1, and compares them using the above equation (1) (step S02). ). If the received power of the pico cell C1 plus the offset is larger than the received power of the macro cell C2, the mobile terminal apparatus UE notifies the base station apparatus B2 of a determination result that Equation (1) is true (step S03). ).
- the mobile terminal apparatus UE performs handover from the macro cell C2 to the pico cell C1 (step S04).
- the range of the pico cell C1 is expanded and the range expansion is performed by the amount that the offset is added to the received power of the pico cell C1.
- the mobile terminal apparatus UE continues communication with the base station apparatus B2 without performing handover.
- the base station apparatus B1 notifies the offset to the mobile terminal apparatus UE in its own cell (in the pico cell C1) (step S05).
- the specific offset of the mobile terminal apparatus UE is set to 0, and the handover offset is set to a value larger than 0.
- the handover process from the pico cell C1 to the macro cell C2 is omitted.
- the mobile terminal apparatus UE measures the received power of the reference signals received from the base station apparatus B1 of the pico cell C1 and the base station apparatus B2 of the macro cell C2, and compares them using the above equation (2) (step S06). ).
- the mobile terminal device UE When the received power of the macro cell C2 is larger than the received power of the pico cell C1, the mobile terminal device UE notifies the base station device B1 of a determination result in which equation (2) is true (step S07).
- base station apparatus B1 specifies the mobile terminal apparatus UE connected by Range expansion from the determination result (step S08). That is, the base station apparatus B1 specifies that the mobile terminal apparatus UE belongs to the extended range of the pico cell C1.
- the base station apparatus B1 performs scheduling on the radio resource corresponding to the blank resource of the downlink transmission frame of the macro cell C2 (step S09).
- the mobile terminal apparatus UE when the reception power of the macro cell C2 is smaller than the reception power of the pico cell C1, the mobile terminal apparatus UE does not notify the determination result to the base station apparatus B1. Thereby, the base station apparatus B1 specifies the mobile terminal apparatus UE connected without Range expansion. In this case, the base station apparatus B1 performs normal scheduling. In addition, the base station apparatus B1 may specify the mobile terminal apparatus UE connected without being subjected to Range expansion upon receiving a determination result in which Expression (2) is false from the mobile terminal apparatus UE.
- the range expansion is performed with the mobile terminal apparatus UE connected by the Range expansion among the mobile terminal apparatuses UE within the own cell (in the pico cell C1). It is possible to distinguish the mobile terminal apparatus UE connected without connecting. For this reason, the base station apparatus B1 can allocate user data to the mobile terminal apparatus UE in a position where interference from the macro cell C2 is received while avoiding resources that receive interference from the macro cell C2. Also, with such a configuration, the base station apparatus B1 performs normal scheduling for the mobile terminal apparatus UE that has selected the pico cell C1 without being subjected to Range expansion, and interferes with the mobile terminal apparatus that has selected the pico cell by Range expansion. Suppressed scheduling can be performed.
- the base station apparatus that covers a pico cell as a small-scale cell has been described.
- the base station apparatus only needs to cover a cell that receives interference from a macro cell, and may be a small base station apparatus that covers a femto cell, a micro cell, or the like.
- the base station device of the pico cell is configured to notify the mobile terminal device of the offset for specifying the mobile terminal device that has been subjected to the range expansion.
- the picocell base station apparatus may be configured not to notify the mobile terminal apparatus of an offset for specifying the mobile terminal apparatus.
- the mobile terminal device sets 0 in advance in the offset of Expression (2), and uses this for specifying whether or not the connection is made by Range expansion.
- adding an offset to the received power in the pico cell may be interpreted as reducing the offset from the received power of the macro cell.
- the received power from the picocell and macrocell base station apparatuses is measured, and the mobile terminal apparatus connected by Range expansion is specified.
- the pico cell base station apparatus may be configured to identify a mobile terminal apparatus connected by Range expansion according to the channel quality fed back from the mobile terminal apparatus.
- the identifying unit of the picocell base station apparatus identifies a mobile terminal apparatus connected by Range expansion when the channel quality fed back from the mobile terminal apparatus is equal to or lower than a predetermined threshold.
- the specifying unit may obtain an average value of channel quality in a predetermined time and compare it with a threshold value.
- the predetermined threshold is set to a value capable of determining whether or not the macro cell reception power is larger than the pico cell reception power, for example, from -5 dB to -10 dB. Note that the predetermined threshold may be set in consideration of errors such as noise.
- the mobile terminal apparatus includes a channel quality measuring unit that measures channel quality of the pico cell and the macro cell.
- the channel quality only needs to indicate propagation quality, and may be, for example, CQI (Channel Quality Indicator).
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- the allocation of component carriers, the number of processing units, the processing procedure, the number of component carriers, and the number of sets of component carriers in the above description can be changed as appropriate. is there. Other modifications can be made without departing from the scope of the present invention.
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Abstract
Description
RSRP_他セル+オフセット>RSRP_サービングセル…(1)
なお、移動端末装置UEが基地局装置B2に接続される場合には、RSRP_他セルはピコセルC1における受信電力、RSRP_サービングセルはマクロセルC2における受信電力をそれぞれ示す。
RSRP_他セル>RSRP_サービングセル+オフセット…(2)
なお、各移動端末装置UEは、ピコセルC1に属されるため、RSRP_他セルはマクロセルC2における受信電力、RSRP_サービングセルはピコセルC1における受信電力をそれぞれ示す。オフセットは、移動端末装置の特定用の場合、0に設定されており、ハンドオーバ用の場合、0よりも大きな値に設定されている。なお、式(2)において、移動端末装置の特定用の場合、オフセット=0として説明するが、移動端末装置の特定に影響を与えない程度の大きさに設定されていてもよい。
下りの通信チャネルは、各移動端末装置で共有される下りデータチャネルとしてのPDSCHと、下りL1/L2制御チャネル(PDCCH、PCFICH、PHICH)とを有する。PDSCHにより、ユーザデータ及び上位制御情報が伝送される。PDCCHにより、PDSCH及び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(Hybrid Automatic Repeat reQuest)のACK/NACKが伝送される。
Claims (10)
- 大規模セルをカバーする他の基地局装置と少なくとも一部の周波数帯が共用され、小規模セルをカバーする基地局装置であり、
移動端末装置に対する送信信号の受信電力にオフセットが加えられたものが、前記他の基地局装置から移動端末装置に対する送信信号の受信電力よりも大きくなることで自セルに属された移動端末装置のうち、当該移動端末装置が前記他の基地局装置から受ける干渉量が大きいものを特定する特定部と、
前記他の基地局装置の下り無線フレームに設定されたブランクリソースに対応させて、前記特定部によって特定された移動端末装置に対してスケジューリングを行うスケジューリング部とを備えたことを特徴とする基地局装置。 - 前記特定部は、前記自セルに属された移動端末装置のうち、当該移動端末装置に対する送信信号の受信電力よりも前記他の基地局装置から当該移動端末装置に対する送信信号の受信電力が大きい移動端末装置を特定することを特徴とする請求項1に記載の基地局装置。
- 前記自セルに属された移動端末装置に対する送信信号の受信電力と前記他の基地局装置から移動端末装置に対する送信信号の受信電力との比較に基づくハンドオーバに用いられるオフセットであり、前記自セルに属された移動端末装置に対する送信信号の受信電力に加えられるオフセットを生成するオフセット生成部を備えたことを特徴とする請求項1または請求項2に記載の基地局装置。
- 前記オフセット生成部は、前記自セルに属された移動端末装置の特定に用いるオフセットをさらに生成し、前記移動端末装置の特定に用いるオフセットに、前記移動端末に対する送信信号の受信電力の大きさに影響のない値を設定し、前記ハンドオーバに用いるオフセットに前記移動端末装置の特定に用いるオフセットの値よりも大きな値を設定することを特徴とする請求項3に記載の基地局装置。
- 大規模セルをカバーする他の基地局装置と少なくとも一部の周波数帯が共用され、小規模セルをカバーする基地局装置に接続可能な移動端末装置であり、
前記基地局装置からの送信信号の受信電力にオフセットを加えたものが、前記他の基地局装置からの送信信号の受信電力よりも大きくなることで前記小規模セルに属される場合に、前記基地局装置からの送信信号の受信電力よりも前記他の基地局装置からの送信信号の受信電力が大きいか否かを判定する第1の判定部を備え、
前記第1の判定部によって前記基地局装置からの送信信号の受信電力よりも前記他の基地局装置からの送信信号の受信電力が大きいと判定された判定結果を、前記基地局装置に通知して、前記基地局装置に前記他の基地局装置の下り無線フレームに設定されたブランクリソースに対応させてスケジューリングさせることを特徴とする移動端末装置。 - 前記小規模セルに属される場合に、前記基地局装置からの送信信号の受信電力にオフセットを加えたものが、前記他の基地局装置からの送信信号の受信電力よりも大きいか否かを判定する第2の判定部を備え、
前記第2の判定部によって前記基地局装置からの送信信号の受信電力にオフセットを加えたものが、前記他の基地局装置からの送信信号の受信電力よりも小さいと判定された判定結果を、前記基地局装置に通知して前記小規模セルから前記大規模セルにハンドオーバを行うことを特徴とする請求項5に記載の移動端末装置。 - 前記第1の判定部は、前記基地局装置から通知されたオフセットが0に設定されている場合に判定し、
前記第2の判定部は、前記基地局装置から通知されたオフセットが0よりも大きな値に設定されている場合に判定することを特徴とする請求項6に記載の移動端末装置。 - 大規模セルをカバーする他の基地局装置と少なくとも一部の周波数帯が共用され、小規模セルをカバーする基地局装置の通信制御方法であり、
移動端末装置に対する送信信号の受信電力にオフセットが加えられたものが、前記他の基地局装置から移動端末装置に対する送信信号の受信電力よりも大きくなることで自セルに属された移動端末装置のうち、当該移動端末装置に対する送信信号の受信電力よりも前記他の基地局装置から当該移動端末装置に対する送信信号の受信電力が大きい移動端末装置を特定するステップと、
前記他の基地局装置の下り無線フレームに設定されたブランクリソースに対応させて、前記特定部によって特定された移動端末装置に対してスケジューリングするステップとを有することを特徴とする通信制御方法。 - 大規模セルをカバーする他の基地局装置と少なくとも一部の周波数帯が共用され、小規模セルをカバーする基地局装置であり、
移動端末装置に対する送信信号の受信電力にオフセットが加えられたものが、前記他の基地局装置から移動端末装置に対する送信信号の受信電力よりも大きくなることで自セルに属された移動端末装置のうち、当該移動端末装置からフィードバックされたチャネル品質が、所定の閾値以下の移動端末装置を特定する特定部と、
前記他の基地局装置の下り無線フレームに設定されたブランクリソースに対応させて、前記特定部によって特定された移動端末装置に対してスケジューリングを行うスケジューリング部とを備えたことを特徴とする基地局装置。 - 前記チャネル品質は、CQI(Channel Quality Indicator)であることを特徴とする請求項9に記載の基地局装置。
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