WO2011145583A1 - 無線通信システム - Google Patents
無線通信システム Download PDFInfo
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- WO2011145583A1 WO2011145583A1 PCT/JP2011/061245 JP2011061245W WO2011145583A1 WO 2011145583 A1 WO2011145583 A1 WO 2011145583A1 JP 2011061245 W JP2011061245 W JP 2011061245W WO 2011145583 A1 WO2011145583 A1 WO 2011145583A1
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- pico
- base station
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- cell
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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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
Definitions
- the present invention relates to a wireless communication system for notifying a start position of a data channel on a component carrier by a control channel in a communication system band in which a plurality of basic frequency blocks (hereinafter referred to as “component carriers”) are collected and widened.
- component carriers basic frequency blocks
- LTE Long Term Evolution
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single-Carrier Frequency Division Multiple Access
- OFDMA is a system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each frequency band, and the subcarriers interfere with each other even though they partially overlap on the frequency. By arranging them closely, it is possible to achieve high-speed transmission and increase frequency utilization efficiency.
- SC-FDMA is a transmission method that can reduce interference between terminals by dividing a frequency band and performing transmission using different frequency bands among a plurality of terminals. Since SC-FDMA has a feature that fluctuations in transmission power are reduced, it is possible to realize low power consumption and wide coverage of a terminal.
- LTE is a system in which one or two or more physical channels are shared by a plurality of mobile stations (UE: User Equipment) for both uplink and downlink.
- the channel shared by the plurality of mobile stations UE is generally referred to as a shared channel.
- PUSCH Physical Uplink Shared CHannel
- PDSCH Physical Downlink Shared CHannel
- TTI transmission time interval
- PDCCH Physical Downlink Control CHannel
- PCFICH Physical Control Format Indicator CHannel
- PHICH Physical Hybrid-ARQ Indicator CHannel
- the downlink control information transmitted by PDCCH includes, for example, Downlink Scheduling Information, UL Scheduling Grant, Overload Indicator, Transmission Power Control Command Bit (Non-Patent Document 1).
- the Downlink Scheduling Information includes, for example, downlink resource block (Resource Block) allocation information, UE ID, number of streams, information on precoding vector, data size, modulation scheme, HARQ ( Information on Hybrid Automatic Repeat reQuest) is included.
- the Uplink Scheduling Grant includes, for example, uplink Resource Block allocation information, UE ID, data size, modulation scheme, uplink transmission power information, and Demodulation Reference Signal information.
- the number of OFDM symbols to which the PDCCH is mapped is notified as control channel format information (CFI).
- CFI control channel format information
- the number of OFDM symbols to which PDCCH is mapped is either 1, 2, or 3, and PDCCH is mapped from the first OFDM symbol in one subframe (Non-patent Document 2).
- a range corresponding to CFI (number of OFDM symbols) notified by PCFICH from the top of the subframe is a control channel region allocated to the PDCCH. If there is information addressed to the mobile station by decoding the control channel region, the mobile station further decodes radio resources allocated to the PDSCH based on the downlink control information.
- LTE-A LTE-Advanced
- 3GPP 3rd Generation Partnership Project
- DCI Downlink Control Information
- PDSCH / PUSCH shared data channel
- An object of the present invention is to provide a wireless communication system that realizes optimal CFI control in an environment where cross-carrier scheduling is applied.
- the present invention is a wireless communication system having a first base station that forms a first cell and a second base station that forms a second cell that at least partially overlaps the first cell,
- the first base station communicates with a subordinate terminal using a plurality of basic frequency blocks
- the first base station transmits a data channel in the one basic frequency block via the control channel of the one basic frequency block.
- first resource information indicating a start position and second resource information indicating a start position of a data channel in the other basic frequency block
- the first resource information is dynamically controlled
- the second resource The information is controlled quasi-statically
- the second base station communicates with the subordinate terminal existing in the second cell and in a position where interference is received from the first cell.
- the fourth resource information indicating the start position of the data channel in the first and second resource information, and the third and fourth resource information are dynamically controlled.
- optimal CFI control can be realized in an environment where cross-carrier scheduling is applied, and PDSCH transmission efficiency can be improved.
- FIG. 1 is an overall view of a mobile communication system according to an embodiment. It is a schematic block diagram of the base station apparatus which concerns on embodiment. It is a schematic block diagram of the mobile terminal device which concerns on an Example.
- FIG. 1 is a diagram showing a hierarchical bandwidth configuration defined in LTE-A.
- an LTE system which is a first mobile communication system that performs radio communication using a variable system band, and a system band (for example, a maximum system band) of the first mobile communication system as a basic unit (basic frequency block).
- This is a hierarchical bandwidth configuration in the case where an LTE-A system that is a second mobile communication system that performs radio communication using a variable system band in which the system band can be switched by adding or reducing basic frequency blocks 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 basic frequency block having the system band of the LTE system as a unit.
- a basic frequency block is called a component carrier (CC).
- CC component carrier
- Such a combination of a plurality of component carriers to increase the bandwidth is called carrier aggregation.
- a mobile terminal apparatus UE (User Equipment) # 1 is a mobile terminal apparatus compatible with the LTE-A system (also compatible with the LTE system) and can support a system band up to 100 MHz.
- UE # 3 is a mobile terminal apparatus compatible with the LTE system (not compatible with the LTE-A system), and can support a system band up to 20 MHz (base band).
- the PDSCH and the PDCCH for demodulating the PDSCH are transmitted on the same component carrier.
- PDSCH-1 is assigned to the component carrier CC1
- PDSCH-2 is assigned to a different component carrier CC2.
- PDSCH-1 which is control information for decoding PDSCH-1 is transmitted on the same component carrier CC1 as PDSCH-1
- PDCCH-2 which is control information for decoding PDSCH-2 is PDSCH-2. It is sent on the same component carrier CC2.
- the user terminal decodes the PDCCH to acquire PDSCH control information, and decodes the PDSCH according to the control information.
- cross-carrier scheduling is used in which the PDCCH of the component carrier that transmits the DSCH is transmitted from a component carrier that is different from the component carrier.
- PDSCH-1 is assigned to component carrier CC1
- PDSCH-2 is assigned to a different component carrier CC2, but PDCCH-2 for decoding PDSCH-2 is different from PDSCH-2. Sent by carrier CC1.
- FIG. 3 shows a conceptual diagram in which a macro cell S1 having a wide coverage area and a pico cell S2 having a local coverage area are arranged in combination. As shown in FIG. 3, it is known that the overall throughput can be improved by arranging the pico cell S2 in a part of the macro cell S1 (for example, a place where the radio wave environment is bad).
- Macro base station BS1 forms macro cell S1, and macro UE1 and macro UE2 that are user terminals exist under macro base station BS1.
- the pico base station BS2 forms the pico cell S2, and the pico base station BS2 is under the control of the pico UE1 and the pico UE2 that are user terminals.
- One macro UE1 is in the vicinity of the base station BS1, while the other macro UE2 exists in the vicinity of the cell edge of the pico cell S2.
- One pico UE1 is in the vicinity of the base station BS2, while the other pico UE2 is in the vicinity of the cell edge of the picocell S2.
- the pico UE2 existing in the vicinity of the cell edge of the picocell S2 will receive large interference from the macro (the macro UE2 and the macro base station BS1). If cross-carrier scheduling is applied to the macro UE2 and the pico UE2, the interference from the macro to the pico UE2 can be greatly reduced.
- FIG. 4A is a conceptual diagram in which cross-carrier scheduling is applied to the PDCCH of the macro UE2 and the pico UE2.
- the macro UE and the pico UE use the same system band, but the system band is shown separately for the macro UE and the pico UE.
- the figure has illustrated the case where two component carrier CC1, CC2 is allocated with respect to macro UE1,2 and picoUE1,2.
- cross-carrier scheduling is performed so as to notify the CFI indicating the PDSCH start positions of CC1 and CC2 from the PDCCH of CC1, and for the pico UE2, the PDSCH of CC1 and CC2 from the PDCCH of CC2
- Cross-carrier scheduling is performed so that CFI indicating the start position is notified.
- pico UE2 can receive CFI of CC1 and CC2 using PDCCH of CC2 which does not receive interference from a macro.
- FIG. 4C shows a state without cross-carrier scheduling for the pico UE1.
- the CC1 PDSCH start position is notified by CFI from the CC1 PDCCH
- the CC2 PDSCH start position is notified by CFI from the CC2 PDCCH.
- the present invention quasi-statically controls the PDSCH start position of CC2 that does not transmit PDCCH for macro UE1 and macro UE2 to which cross carrier scheduling is applied, and CC1 that does not transmit PDCCH for pico UE2 to which cross carrier scheduling is applied.
- the PDSCH start position is dynamically controlled.
- the PDSCH of CC1 can be transmitted with high efficiency by dynamically controlling the PDSCH start position of CC1 that does not transmit PDCCH (for example, CFI is controlled for each subframe).
- the PDSCH start position of the CC2 that does not transmit the PDCCH is dynamically (for example, in units of subframes) or quasi-statically controlled (for example, a period longer than the subframe).
- the PDSCH start position of CC2 of macro UE2 can be advanced, thereby enabling efficient transmission of PDSCH.
- FIG. 5 how the PDSCH transmission efficiency is improved by quasi-static control of the PDSCH start position of CC2 for macro / pico UE2 will be specifically described.
- FIG. 5A there are many UEs with large interference from the macro base station such as the pico UE2, and during the period in which 3 OFDM symbols are allocated to the PDCCH of CC2, The CFI is quasi-statically controlled so as to start from 4 OFDM symbols of a subframe so as not to overlap with the PDCCH of the pico UE2.
- the start position of the PDSCH of CC2 used for communication with the macro UE2 can be extended to the 2nd or 3rd OFDM symbol as compared with the case where it is fixed to the 4th OFDM symbol, the PDSCH transmission efficiency can be improved.
- FIG. 6 is a diagram for explaining the configuration of the mobile communication system 1 including the mobile stations 10 and 11 and the base stations 20 and 21 according to the present embodiment.
- the mobile communication system 1 shown in FIG. 6 is a system including, for example, an LTE system or SUPER 3G.
- the mobile communication system 1 may be called IMT-Advanced or 4G.
- the mobile communication system 1 includes a base station 20 serving as a macro base station and mobile stations 10 (10 1 , 10 2 , 10 3 ,...) Serving as a plurality of macro mobile stations communicating with the base station 20. It consists of The macro base station 20 is connected to the higher station apparatus 30, and the higher station apparatus 30 is connected to the core network 40. The macro mobile station 10 communicates with the macro base station 20 in the macro cell 50.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- a pico base station 21 that forms a pico cell 51, which is local coverage, is arranged in a part of the macro cell 50. In the pico cell 51, mobile stations 11 (11 1 , 11 2 ...) That serve as pico mobile stations exist under the control of the pico base station 21.
- Each mobile station (10 1 , 10 2 , 10 3 ,... 10 n ), (11 1 , 11 2 ”) Has the same configuration, function, and state. Unless otherwise noted, the description will be made assuming that the mobile stations 10 and 11 are not. For convenience of explanation, it is assumed that the mobile stations 10 and 11 communicate wirelessly with the base stations 20 and 21, but more generally user equipment (User Equipment) including both the mobile station and the fixed terminal device. Good.
- User Equipment User Equipment
- OFDMA is applied to the downlink and SC-FDMA or clustered DFT-spread OFDM (Clustered DFT-Spread OFDM) is applied to the uplink as the radio access scheme.
- 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. .
- Clustered DFT spread OFDM assigns non-contiguous clustered subcarrier groups (clusters) to one mobile station UE, and applies discrete Fourier transform spread OFDM to each cluster, thereby providing uplink multiples. This is a method for realizing connection.
- the downlink control channel may be referred to as a downlink L1 / L2 control channel.
- User data including higher layer control signals
- Transmission data is included in this user data.
- the component carriers assigned to the mobile stations 10 and 11 by the base stations 20 and 21 may be notified to the mobile stations 10 and 11 by RRC signaling.
- PUSCH For the uplink, PUSCH that is shared and used by the mobile stations 10 and 11 and PUCCH that is an uplink control channel are used. User data is transmitted by this PUSCH. Also, UL ACK / NACK, downlink radio quality information (CQI: Channel Quality Indicator), etc. are transmitted by PUCCH.
- CQI Channel Quality Indicator
- FIG. 7 is a schematic configuration diagram of the macro base station 20 according to the present embodiment.
- the pico base station 21 has the same basic configuration as the macro base station 20 and includes the components shown in FIG. Hereinafter, although the configuration of the macro base station 20 will be described in detail, the configuration of the pico base station 21 is also the same.
- the macro base station 20 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 macro base station 20 to the mobile station 10 in the downlink is input to the baseband signal processing unit 204 via the transmission path interface 206 from the higher station apparatus 30 located above the macro base station 20. .
- PDCP layer processing such as sequence number assignment, user data division / combination, RLC (Radio Link Control) retransmission control transmission processing such as RLC (Radio Link Control) retransmission control 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, precoding processing is performed and transferred to the transmission / reception unit 203 .
- the downlink control channel signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to the transmission / reception unit 203.
- the baseband signal processing unit 204 further notifies the mobile station 10 of control information for communication in the cell 50 through a broadcast channel.
- the broadcast information for communication in the cell 50 includes, for example, system bandwidth in the uplink or downlink, identification information (Root Sequence Index) of a root sequence for generating a random access preamble signal in the PRACH, and the like. It is.
- the transmission / reception unit 203 performs frequency conversion processing for converting the baseband signal output from the baseband signal processing unit 204 into a radio frequency band, and then is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the macro base station 20 receives the transmission wave transmitted from the macro mobile station 10 by the transmission / reception antenna 201.
- a radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202, frequency-converted by the transmission / reception unit 203, converted into a baseband 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, and PDCP layer reception processing on user data included in the input baseband signal. Then, the data 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, status management of the macro base station 20, and radio resource management.
- FIG. 8 is a schematic configuration diagram of the macro mobile station 10 according to the present embodiment.
- the pico mobile station 11 has the same basic configuration as the macro mobile station 10 and includes the components shown in FIG.
- the configuration of the macro mobile station 10 will be described in detail, the configuration of the pico mobile station 11 is also the same.
- the macro mobile station 10 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.
- the 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 data 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.
- the broadcast information in the downlink data is also transferred to the application unit 105.
- uplink user data is input from the application unit 105 to the baseband signal processing unit 104.
- transmission processing of retransmission control (H-ARQ (Hybrid ARQ)), channel coding, DFT processing, IFFT processing, and the like are performed and transferred to the transmission / reception unit 103.
- H-ARQ Hybrid ARQ
- channel coding channel coding
- DFT processing IFFT processing
- IFFT processing IFFT processing
- the transmission / reception unit 103 frequency conversion processing for converting the baseband signal output from the baseband signal processing unit 104 into a radio frequency band is performed, and then amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- FIG. 9 is a functional block diagram of the baseband signal processing unit 204 and some higher layers included in the macro base station 20 according to the present embodiment.
- the baseband signal processing unit 204 is mainly a functional block of a transmission processing unit. Is shown.
- FIG. 9 exemplifies a base station configuration that can support a maximum of M (CC1 to CCM) component carriers. Transmission data for the macro mobile station 10 under the control of the macro base station 20 is transferred from the higher station apparatus 30 to the macro base station 20.
- M CC1 to CCM
- the control information generator 300 generates a higher control signal for higher layer signaling (for example, RRC signaling) for each user.
- the upper control signal can include a command for requesting addition / reduction of the component carrier CC.
- the data generation unit 301 outputs the transmission data transferred from the higher station apparatus 30 as user data for each user.
- the component carrier selection unit 302 selects a component carrier used for wireless communication with the mobile station 10 for each user.
- the base station 20 notifies the mobile station 10 of addition / reduction of component carriers by RRC signaling, and receives a complete message from the mobile station 10.
- the assignment (addition / deletion) of the component carrier is confirmed for the user, and the confirmed assignment of the component carrier is set in the component carrier selection unit 302 as the component carrier assignment information.
- the upper control signal and transmission data are distributed to channel coding section 303 of the corresponding component carrier.
- the scheduling unit 310 controls allocation of component carriers to the subordinate mobile stations 10 according to the communication quality of the entire system band.
- the scheduling unit 310 determines addition / deletion of a component carrier to be allocated for communication with the mobile station 10.
- the control information generation unit 300 is notified of the determination result regarding the addition / deletion of the component carrier.
- uplink scheduling either SC-FDMA or clustered DFT spread OFDM is dynamically controlled (for each subframe).
- a component carrier (uplink) to which clustered DFT spread OFDM is applied the number of clusters and cluster resources are determined.
- the scheduling unit 310 controls resource allocation in each component carrier CC1 to CCM. Scheduling is performed by distinguishing between LTE terminal users and LTE-A terminal users.
- the scheduling unit 310 receives transmission data and a retransmission instruction from the higher station apparatus 30 and receives a channel estimation value and a CQI of a resource block from a receiving unit that measures an uplink reception signal.
- the scheduling unit 310 performs scheduling of downlink allocation information, uplink allocation information, and upper and lower shared channel signals while referring to the retransmission instruction, channel estimation value, and CQI input from the higher station apparatus 30.
- the propagation path in mobile communication varies depending on the frequency due to frequency selective fading.
- a resource block with good communication quality is assigned to each mobile station 10 for each subframe (referred to as adaptive frequency scheduling).
- adaptive frequency scheduling a mobile station 10 with good channel quality is selected and assigned to each resource block. Therefore, the scheduling unit 310 allocates resource blocks expected to improve throughput using the CQI for each resource block fed back from each mobile station 10.
- a resource block is allocated for each cluster to an uplink to which clustered DFT spread OFDM is applied.
- an MCS coding rate, modulation scheme
- Parameters satisfying the MCS (coding rate, modulation scheme) determined by the scheduling unit 310 are set in the channel coding units 303, 308, 312 and the modulation units 304, 309, 313.
- the baseband signal processing unit 204 includes a channel encoding unit 303, a modulation unit 304, and a mapping unit 305 corresponding to the maximum user multiplexing number N in one component carrier.
- the channel coding unit 303 channel-codes a shared data channel (PDSCH) configured by user data (including some higher control signals) output from the data generation unit 301 for each user.
- the modulation unit 304 modulates channel-coded user data for each user.
- the mapping unit 305 maps the modulated user data to radio resources.
- the baseband signal processing unit 204 includes a downlink control information generation unit 306 that generates downlink shared data channel control information that is user-specific downlink control information, and a downlink common control channel control that is user-specific downlink control information. And a downlink common channel control information generating unit 307 that generates information.
- the downlink allocation information of DCI Format 1 is downlink shared data channel control information.
- the downlink control information generation section 306 generates downlink allocation information (for example, DCI Format 1) from the resource allocation information, MCS information, HARQ information, PUCCH transmission power control command, etc. determined for each user.
- DCI Format 1 is placed in the search space determined according to the rules defined in LTE.
- joint coding information (CC + CFI) can be added to DCI Format 1 when CFI and a component carrier number (CC index) are jointly coded according to a joint coding table described later.
- the baseband signal processing unit 204 includes a channel encoding unit 308 and a modulation unit 309 corresponding to the maximum user multiplexing number N in one component carrier.
- the channel coding unit 308 channel-codes the control information generated by the downlink control information generation unit 306 and the downlink common channel control information generation unit 307 for each user.
- Modulation section 309 modulates channel-coded downlink control information.
- the baseband signal processing unit 204 includes an uplink control information generation unit 311 that generates, for each user, uplink shared data channel control information that is control information for controlling the uplink shared data channel (PUSCH), and the generated uplink A channel coding unit 312 that performs channel coding of the shared data channel control information for each user, and a modulation unit 313 that modulates the channel-coded uplink shared data channel control information for each user.
- uplink control information generation unit 311 that generates, for each user, uplink shared data channel control information that is control information for controlling the uplink shared data channel (PUSCH), and the generated uplink A channel coding unit 312 that performs channel coding of the shared data channel control information for each user, and a modulation unit 313 that modulates the channel-coded uplink shared data channel control information for each user.
- Uplink allocation information configured with DCI Format 0 is uplink shared data channel control information.
- the uplink control information generation unit 311 includes uplink resource allocation information (cluster) determined for each user, MCS information and redundant version (RV), an identifier (New Data Indicator) for distinguishing between new data and retransmission data, and PUSCH.
- Uplink allocation information is generated from a transmission power control command (TPC), a cyclic shift (CS for DMRS) of a demodulation reference signal, a CQI request, and the like.
- TPC transmission power control command
- CS for DMRS cyclic shift
- uplink allocation information of DCI format 0 is generated according to the rules defined in LTE.
- joint coding information CC + CFI
- the control information modulated for each user by the modulation units 309 and 313 is multiplexed by the control channel multiplexing unit 314 and further interleaved by the interleaving unit 315.
- the control signal output from the interleaving unit 315 and the user data output from the mapping unit 305 are input to the IFFT unit 316 as downlink channel signals.
- the IFFT unit 316 converts the downlink channel signal from a frequency domain signal to a time-series signal by performing inverse fast Fourier transform.
- the cyclic prefix insertion unit 317 inserts a cyclic prefix into the time-series signal of the downlink channel signal.
- the cyclic prefix functions as a guard interval for absorbing a difference in multipath propagation delay.
- the transmission data to which the cyclic prefix is added is sent to the transmission / reception unit 203.
- the pico base station 21 has the functional block configuration shown in FIGS. 7 and 9, similarly to the macro base station 20.
- a subscript (M) is added on the macro side
- a subscript (P) is added on the pico side to the reference numerals of the respective functional blocks.
- the reference numerals shown in FIGS. 7 and 9 are used in common.
- FIG. 10 is a functional block diagram of the baseband signal processing unit 104 included in the macro mobile station 10, and shows functional blocks of an LTE-A terminal that supports LTE-A. First, the downlink configuration of the macro mobile station 10 will be described.
- the CP is removed by the CP removal unit 401 from the downlink signal received as received data from the macro base station 20.
- the downlink signal from which the CP is removed is input to the FFT unit 402.
- the FFT unit 402 performs fast Fourier transform (FFT) on the downlink signal to convert it from a time domain signal to a frequency domain signal, and inputs it to the demapping unit 403.
- the demapping unit 403 demaps the downlink signal, and extracts multiplex control information, user data, and higher control signal in which a plurality of control information is multiplexed from the downlink signal. Note that the demapping process by the demapping unit 403 is performed based on a higher control signal input from the application unit 105.
- the multiplex control information output from the demapping unit 403 is deinterleaved by the deinterleaving unit 404.
- the baseband signal processing unit 104 includes a control information demodulation unit 405 that demodulates control information, a data demodulation unit 406 that demodulates downlink shared data, and a channel estimation unit 407.
- the control information demodulator 405 is configured to control the uplink shared data channel by blindly decoding the search space from the downlink control channel and the common control channel control information demodulator 405a that demodulates the downlink common control channel control information from the downlink control channel.
- An uplink shared data channel control information demodulator 405b for demodulating information, and a downlink shared data channel control information demodulator 405c for blindly decoding the search space from the downlink control channel and demodulating the downlink shared data channel control information I have.
- the data demodulator 406 includes a downlink shared data demodulator 406a that demodulates user data and higher control signals, and a downlink shared channel data demodulator 406b that demodulates downlink shared channel data.
- the common control channel control information demodulator 405a extracts common control channel control information that is common control information for users through blind decoding processing, demodulation processing, channel decoding processing, and the like of the common search space of the downlink control channel (PDCCH). .
- the common control channel control information includes downlink channel quality information (CQI), is input to the mapping unit 115 described later, and is mapped as part of transmission data to the macro base station 20.
- CQI downlink channel quality information
- the uplink shared data channel control information demodulator 405b is an uplink shared data channel that is user-specific uplink allocation information by blind decoding processing, demodulation processing, channel decoding processing, etc. of the user-specific search space of the downlink control channel (PDCCH). Control information is extracted.
- the uplink allocation information is used for controlling the uplink shared data channel (PUSCH), and is input to the downlink common channel data demodulating unit 406b.
- the downlink shared data channel control information demodulator 405c is used for the downlink shared data channel that is a downlink control signal unique to the user by blind decoding processing, demodulation processing, channel decoding processing, etc. of the user dedicated search space of the downlink control channel (PDCCH). retrieve control information.
- the downlink shared data channel control information is used to control the downlink shared data channel (PDSCH) and is input to the downlink shared data demodulation unit 406.
- the downlink shared data channel control information demodulator 405c performs a blind decoding process on the user-specific search space based on information on the PDCCH and PDSCH included in the higher control signal demodulated by the downlink shared data demodulator 406a. Do. Information related to the user-specific search space (which may include ON / OFF of activation / deactivation of PDSCH / PDCCH) is signaled by the upper control signal.
- the downlink shared data demodulator 406a acquires user data and higher control information based on the downlink shared data channel control information input from the downlink shared data channel control information demodulator 405c. Upper control information (including mode information) is output to channel estimation section 407.
- the downlink common channel data demodulation unit 406b demodulates the downlink common channel data based on the uplink shared data channel control information input from the uplink shared data channel control information demodulation unit 405b.
- the channel estimation unit 407 performs channel estimation using the common reference signal.
- the estimated channel fluctuation is output to the common control channel control information demodulator 405a, the uplink shared data channel control information demodulator 405b, the downlink shared data channel control information demodulator 405c, and the downlink shared data demodulator 406a.
- These demodulation units demodulate the downlink allocation information using the estimated channel fluctuation and demodulation reference signal.
- the baseband signal processing unit 104 includes a data generation unit 411, a channel encoding unit 412, a modulation unit 413, a DFT unit 414, a mapping unit 415, an IFFT unit 416, and a CP insertion unit 417 as functional blocks of a transmission processing system.
- the data generation unit 411 generates transmission data from the bit data input from the application unit 105.
- the channel coding unit 412 performs channel coding processing such as error correction on the transmission data, and the modulation unit 413 modulates the channel-coded transmission data with QPSK or the like.
- the DFT unit 414 performs discrete Fourier transform on the modulated transmission data.
- Mapping section 415 maps each frequency component of the data symbol after DFT to a subcarrier position designated by the base station apparatus.
- the IFFT unit 416 performs inverse fast Fourier transform on input data corresponding to the system band to convert it into time series data, and the CP insertion unit 417 inserts a cyclic prefix into the time series data at data delimiters.
- the pico mobile station 11 has the functional block configuration shown in FIGS. 8 and 10, similarly to the macro mobile station 10.
- a subscript (M) is added on the macro side
- a subscript (P) is added on the pico side to the reference numerals of the respective functional blocks.
- the reference numerals shown in FIGS. 8 and 10 are used in common.
- Macro mobile station 10 2 are under the macro base station 20 shown in FIG. 6 corresponds to the macro UE2 shown in FIG. 3, the pico mobile station 11 2 are under the pico base station 21 shown in FIG. 6, FIG. 3 It shall correspond to pico UE2 shown in FIG. That is, the pico mobile station 11 2 is present in the cell edge of the picocell 51, the macro mobile station 10 2 is present near the cell edge of the picocell 51 which is a vicinity of the pico mobile station 11 2.
- the macro base station 20 assigns two component carriers CC1 and CC2 to the macro mobile station 10 2, the pico base station 21 assigns the same component carrier CC1 and CC2 and the macro-side with respect to pico mobile station 112 It shall be.
- Macro base station 20 and the pico base station 21 controls the CFI to adapt to the environment for the macro mobile station 10 2 and the pico mobile station 11 2.
- the scheduling unit 310 (M) is to apply cross-carrier scheduling for notifying CFI indicating the PDSCH starting position of CC1 and CC2 to the macro mobile station 10 2 to the CC1 PDCCH.
- the scheduling unit 310 (P) is, applies a cross-carrier scheduling to be notified by CFI indicating the PDSCH starting position of CC1 and CC2 from the PDCCH of CC2 respect pico mobile station 11 2 . As shown in FIG.
- the CFI indicating the transmission start position of the PDSCH of CC1 applies cross carrier scheduling notified using the PDCCH of CC2.
- the pico base station 21 can notify the CFI indicate to the pico mobile station 11 2, the transmission start position of the CC1 PDSCH without using CC1 of PDCCH interference is greater from the macro.
- the present invention includes a CFI of CC1 and CC2 to be notified to the macro mobile station 10 2, and the CFI of CC1 and CC2 to be notified to the pico mobile station 11 2 is controlled as follows. That is, for the macro mobile station 10 2, CFI of CC1 sending the PDCCH is controlled dynamically, CFI of CC2 not sending the PDCCH is quasi-static control. As shown in FIGS. 5A and 5B, in accordance with the number of PDCCH symbols of CC2 on the pico side, the CFI of CC2 on the macro side is set so that the PDCCH of CC2 on the pico side and the PDSCH of CC2 on the macro side do not overlap. It is desirable to control quasi-statically.
- the PDSCH start position in CC1 is dynamically controlled for each subframe, high transmission efficiency of PDSCH in CC1 can be realized. Also, since the PDSCH start position in CC2 not transmitting the PDCCH is controlled semi-statically with a relatively long period of the CFI, the PDSCH start position in CC2 is the maximum value (the pico side assigns to the PDCCH ( Compared with the case where the position is fixed to the position corresponding to the first 3 OFDM symbols of the subframe of CC2), the PDSCH transmission efficiency in CC2 can also be increased (see FIG. 5B).
- CFI of CC2 sending the PDCCH is controlled dynamically, CC1 of CFI not transmitting the PDCCH also dynamic control.
- start position of the PDSCH of CC1 on the pico side changes and overlaps with the PDCCH on the macro side, but there is no problem because the influence of the PDSCH on the pico side on the macro side PDCCH is limited.
- the PDSCH start position in CC1 and CC2 is dynamically controlled for each subframe, so that high transmission efficiency of PDSCH in CC1 and CC2 can be realized.
- the scheduling unit 310 performs scheduling of the uplink / downlink control signal and the upper and lower shared channel signals while referring to the retransmission instruction, the channel estimation value, and the CQI input from the higher station apparatus 30. I do.
- the propagation path in mobile communication varies depending on the frequency due to frequency selective fading. Therefore, when transmitting user data to the mobile stations 10 and 11, adaptive frequency scheduling is used in which resource blocks with good communication quality are assigned to the mobile stations 10 and 11 for each subframe. In adaptive frequency scheduling, a mobile station with good channel quality is selected and assigned to each resource block. Therefore, the scheduling unit 310 allocates resource blocks using the CQI for each resource block fed back from the mobile stations 10 and 11. Also, an MCS (coding rate, modulation scheme) that satisfies a predetermined block error rate with the allocated resource block is determined.
- MCS coding rate, modulation scheme
- one or a plurality of component carriers (CC1 to CCM) used for communication with the mobile stations 10 and 11 are dynamically allocated at the start of communication or during communication.
- CC1 to CCM component carriers
- a maximum of five component carriers can be assigned at the same time.
- the number of component carriers allocated to the mobile stations 10 and 11 can be determined according to conditions such as mobile station capability, current communication quality, and current data amount. For example, component carrier allocation information is moved by RRC signaling. The stations 10 and 11 can be notified. As shown in FIG.
- the macro base station 20 acquires information on the pico mobile station 11
- the method for acquiring information related to the pico mobile station 11 is not particularly limited.
- the information about the pico mobile station 11 from the pico base station 21 may be obtained from the higher station apparatus 30 that has been taken up.
- the scheduling unit 310 manages component carriers allocated to each user (mobile stations 10 and 11). If a plurality of component carriers are assigned to one user, a PDSCH for transmitting data to the user is secured for each assigned component carrier. In addition, the component carrier for transmitting the PDCCH for PDSCH demodulation secured in the component carrier is selected from among the component carriers assigned to the user. As a result, when a PDCCH is transmitted from a component and carrier different from the component carrier to which the PDSCH is transmitted (cross carrier scheduling), a CC index (carrier indicator) at which the PDSCH is transmitted is determined. The carrier indicator may be instructed from the upper layer to the scheduler 220, or may be determined using a joint coding table.
- the scheduling unit 310 determines the optimum number of OFDM symbols (CFI value) according to the cell radius, the number of accommodated users, and the like.
- the scheduling unit 310 of the macro base station 20 (M) is, CFI the CC1 to the macro mobile station 10 2 while dynamic control, CFI of CC2 is quasi-static control. Specifically, in accordance with the CFI of CC2 for pico mobile station 11 2 pico side, to quasi-static control CFI of CC2 for the macro mobile station 10 2. As shown in FIG. 5A, CFI of CC2 for pico mobile station 11 2 is if 3OFDM symbol, controls the CFI of CC2 for the macro mobile station 10 2 to 3OFDM symbol. As shown in FIG.
- CFI of CC2 for pico mobile station 11 2 is if 1OFDM symbol, controls the CFI of CC2 for the macro mobile station 10 2 to 1OFDM symbol.
- the CFI of the CC that does not transmit the PDCCH is controlled quasi-statically so as to have the same CFI value as the CFI assigned to the pico mobile station 11 that receives interference on the pico side.
- the CFI assigned to the pico mobile station 11 that interferes with the pico side may be notified from the pico base station 21 or the upper station apparatus 30.
- the number of pico mobile stations 11 existing in the pico cell 51 may be used instead of the CFI itself allocated to the pico mobile station 11.
- the CFI assigned to the pico mobile station 11 may be predicted from the number of the pico mobile stations 11 present in the pico cell 51.
- Scheduling section 310 (M) to the macro mobile station 10 2, the CC1 of CFI to be dynamically controlled, downlink control information generating unit 306 corresponding to the CC1 (M) and the uplink control information generating unit 311 to (M) Then, the CFI of CC2 that is quasi-statically controlled with a period sufficiently longer than the subframe is provided to the downlink control information generation unit 306 (M) and the uplink control information generation unit 311 (M) corresponding to CC2.
- the downlink control information generating section 306 is for generating control information for the macro mobile station 10 2, PCFICH, downlink a PDCCH which PHICH are multiplexed allocation transmitted in CC1 It generates as information (DCI Format 1).
- the CFI sent by PCFICH is updated for each subframe in accordance with an instruction from the scheduling unit 310 (M) (CFI dynamic control).
- downlink control information generating section 306 generates control information for the macro mobile station 10 2 (M) is a downlink assignment information CC2 (DCI Format 1 ) Is generated.
- the CFI included in the CC2 downlink allocation information (DCI Format 1) is updated in a long cycle corresponding to a plurality of subframes in accordance with an instruction from the scheduling unit 310 (M) (CFI quasi-static control).
- CC2 downlink allocation information (DCI Format 1) is given to the baseband signal processing section 204 corresponding to the CC1, the downlink control information generating unit 306 to the macro mobile station 10 2 to generate a downlink allocation information of CC1 ( M).
- the CC1 downlink assignment information and the CC2 downlink assignment information are controlled to be arranged on the CC1 PDCCH as shown in FIG. 2B.
- CIF carrier indicator field
- FIG. 11 shows a joint coding table of CC and CFI.
- the base stations 20 and 21 and the mobile stations 10 and 11 hold the same joint coding table, and jointly encode / decode the CC index and CFI.
- the maximum value of the number of component carriers is 5 and the CFI is 1, 2 or 3, and the combination of the component carrier and the CFI is jointly encoded.
- An example in which the bit width of CIF is 3 bits is shown. When the bit width of CIF is 3 bits, the required number of bits of CIF is insufficient according to the number of component carriers.
- the scheduling unit 310 of the pico base station 21 (P), while controlling the CFI of CC2 to transmit the PDCCH with respect to pico mobile station 11 2 dynamically, CC1 of CFI not sending PDCCH also controls dynamically.
- the pico base station 21 controls the CFI of CC2 corresponding to the number of pico mobile stations 11. For example, the more pico number of mobile station 11, as shown in FIG. 5A, controls the CFI to allocate 3OFDM symbols in the PDCCH of CC2 for pico mobile station 11 2. Also, the less the pico number of mobile station 11, as shown in FIG. 5B, controls the CFI to allocate 1OFDM symbol (or 2OFDM symbols) in the PDCCH of CC2 for pico mobile station 11 2.
- deinterleaving section 404 deinterleaves PDCCH mapped to the first to third OFDM symbols of the subframe. If the macro mobile station 10 2, acquires the CFI by demodulating the PCFICH the downlink shared data channel control information demodulation section 405c is multiplexed to the head OFDM symbol of CC1 of the sub-frame, OFDM symbol range specified by CFI To downlink allocation information (DCI). Since the macro mobile station 10 2 is cross-carrier scheduling is applied, the downlink allocation information for the PDSCH demodulation CC1 from CC1 of PDCCH downlink assignment information for PDSCH demodulation (DCI) and CC2 (DCI) Is demodulated.
- DCI downlink assignment information for PDSCH demodulation
- CC2 CC2
- the CC index and CFI which are CIs, are decoded using the joint coding table shown in FIG.
- the CC index and CFI which are CIs, are decoded using the joint coding table shown in FIG.
- CIF 000 is demodulated
- CFI is notified by PCFICH.
- This CFI is dynamically controlled in units of subframes.
- the uplink shared data channel control information demodulator 405b similarly demodulates the CFI.
- the downlink shared data demodulator 406a obtains the PDSCH start position for CC1 based on the CFI notified by CC1's PCFICH, and demodulates it from the head of PDSCH.
- the PDSCH start position is obtained based on the CFI decoded from CC2 downlink allocation information (DCI), and demodulated from the beginning of PDSCH.
- DCI downlink allocation information
- pico mobile station 11 In pico mobile station 11 2, in the same manner as the macro mobile station 10 2, it acquires the CFI and CC1 of CFI of C2 from PDCCH of CC2, demodulates the PDSCH from CC2 and CC1.
- the present invention is applicable to a communication system that performs cross-carrier scheduling so as to reduce interference between a mobile station that exists in one cell and a mobile station that exists in the other cell and receives interference from the other cell.
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Abstract
Description
マクロ基地局20は、送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、呼処理部205と、伝送路インターフェース206とを備えている。
図6に示すマクロ基地局20の配下にいるマクロ移動局102は、図3に示すマクロUE2に相当し、図6に示すピコ基地局21の配下にいるピコ移動局112は、図3に示すピコUE2に相当するものとする。すなわち、ピコ移動局112は、ピコセル51のセル端に存在し、マクロ移動局102はピコ移動局112の近傍となるピコセル51のセル端付近に存在している。
Claims (4)
- 第1のセルを形成する第1の基地局と、前記第1のセルと少なくとも一部が重なる第2のセルを形成する第2の基地局とを有する無線通信システムであり、
前記第1の基地局は、配下の端末との間で、複数の基本周波数ブロックを用いて通信する場合、一方の基本周波数ブロックの制御チャネルを介して、当該一方の基本周波数ブロックにおけるデータチャネルの開始位置を示す第1のリソース情報と他方の基本周波数ブロックにおけるデータチャネルの開始位置を示す第2のリソース情報とを送信し、前記第1のリソース情報はダイナミックに制御し、前記第2のリソース情報は準静的に制御し、
前記第2の基地局は、前記第2のセル内であって前記第1のセルから干渉を受ける位置に存在する配下の端末との間で、前記一方及び他方の基本周波数ブロックを用いて通信する場合、他方の基本周波数ブロックの制御チャネルを介して、当該他方の基本周波数ブロックにおけるデータチャネルの開始位置を示す第3のリソース情報と一方の基本周波数ブロックにおけるデータチャネルの開始位置を示す第4のリソース情報とを送信し、前記第3及び第4のリソース情報はダイナミックに制御することを特徴とする無線通信システム。 - 前記第1の基地局は、前記第2の基地局が前記他方の基本周波数ブロックにおいて配下の端末に割り当てる制御チャネルのシンボル数が最大シンボル数より少ない期間では、前記他方の基本周波数ブロックにおけるデータチャネルの開始位置が時間的に早い時期となるように前記第2のリソース情報を制御することを特徴とする請求項1記載の無線通信システム。
- 前記第1のセルは、前記第2のセルよりも大きいマクロセルであり、前記第2のセルは、前記第1のセルに包含される又は前記第1のセルの一部を埋めるピコセルであることを特徴とする請求項1記載の無線通信システム。
- 前記第1の基地局は、前記第1のリソース情報を、送信時間間隔であるサブフレーム毎に制御し、前記第2のリソース情報を、サブフレームよりも長い周期で制御することを特徴とする請求項1記載の無線通信システム。
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Also Published As
Publication number | Publication date |
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JP5265616B2 (ja) | 2013-08-14 |
JP2011244198A (ja) | 2011-12-01 |
US20130107855A1 (en) | 2013-05-02 |
US9191951B2 (en) | 2015-11-17 |
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