WO2017150447A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017150447A1 WO2017150447A1 PCT/JP2017/007499 JP2017007499W WO2017150447A1 WO 2017150447 A1 WO2017150447 A1 WO 2017150447A1 JP 2017007499 W JP2017007499 W JP 2017007499W WO 2017150447 A1 WO2017150447 A1 WO 2017150447A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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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
- H04L5/0055—Physical resource allocation for ACK/NACK
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- Non-patent Document 1 LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + ( 5th generation mobile communication system plus) and New-RAT (Radio Access Technology) are also being considered.
- LTE-A LTE-Advanced
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- 5G + 5th generation mobile communication system plus
- New-RAT Radio Access Technology
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a transmission time interval (TTI) applied to DL transmission and UL transmission between the radio base station and the user terminal is set to 1 ms and controlled.
- the TTI in the existing LTE system is also called a subframe, a subframe length, etc., and becomes a unit of scheduling.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the TTI length is shorter than 1 ms of the existing LTE system, or HARQ (Hybrid Automatic repeat)
- HARQ Hybrid Automatic repeat
- ACK / NACK A / N: Acknowledgement / Negative-Acknowledgement
- HARQ-ACK etc.
- a TTI configuration that transmits an ACK / NACK of the received signal within the same TTI as the received signal is also referred to as self-contained.
- wireless parameters for example, TTI length, cyclic prefix ( It has also been studied to frequency-division multiplex a plurality of TTIs having different CP (Cyclic Prefix) length, ACK / NACK transmission timing, signal configuration, and the like.
- the present invention has been made in view of such points, and an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of communicating using a radio interface with improved expandability in the frequency domain. To do.
- a user terminal receives a downlink control signal including downlink data signal allocation information, receives the downlink data signal based on the downlink control signal, and delivers the downlink data signal
- communication can be performed using a wireless interface with improved expandability in the frequency domain.
- 1A and 1B are diagrams illustrating an example of a self-contained TTI. It is a figure which shows an example of the frequency division multiplexing of several TTI from which a radio
- FIGS. 7A and 7B are diagrams illustrating an example of local / distributed mapping of a downlink control signal according to the present embodiment.
- 8A and 8B are diagrams illustrating an example of scheduling according to the present embodiment.
- 9A, 9B, and 9C are diagrams illustrating an example of a radio frame structure according to the present embodiment. It is a figure which shows an example of the physical channel / signal supported by the anchor / booster carrier which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the radio
- a TTI having a shorter time length than 1 ms is also called a shortened TTI, a short TTI, a partial TTI, a shortened subframe, or the like.
- a TTI having a time length of 1 ms is also called a normal TTI, a long TTI, a subframe, or the like.
- a normal TTI and a shortened TTI are distinguished, they are also referred to as a normal TTI and a shortened TTI, respectively.
- the shortened TTI includes a first configuration example configured with the same number of symbols as the normal TTI (for example, 14 symbols in the case of a normal CP), and a second configuration example configured with fewer symbols than the normal TTI. .
- each symbol in the shortened TTI has a shorter symbol length than the normal TTI symbol length (for example, 66.7 ⁇ s), but is longer than the normal TTI subcarrier interval (for example, 15 kHz). With subcarrier spacing.
- each symbol in the shortened TTI has the same symbol length as that of the normal TTI.
- signal assignment also referred to as self-contained assignment
- transmission / reception control scheduling, retransmission control, etc.
- the TTI to which the signal allocation is performed is also called a self-contained TTI (self-contained TTI), a self-contained subframe, a self-contained symbol set, or the like.
- FIG. 1 is a diagram showing an example of a self-contained TTI.
- a reference signal (RS) / downlink control (DL control) region to which a reference signal and / or downlink control signal is mapped and a downlink data signal are mapped.
- a downlink data (DL data) area to be transmitted and a feedback area to which delivery confirmation information for the downlink data signal is mapped are provided.
- a guard period may be provided as a downlink / uplink switching time between the data area and the feedback area.
- a reference signal / downlink control area to which a reference signal and / or a downlink control signal is mapped
- an uplink data area to which an uplink data signal is mapped
- a feedback area to which the acknowledgment information for the uplink data signal is mapped is provided.
- a guard period may be provided as a downlink / uplink switching time between the reference signal / downlink control area and the data area and between the data area and the feedback area, respectively.
- the feedback information (eg, ACK / NACK) for downlink / uplink data is 4 TTIs after the TTI that received the downlink / uplink data, so use the self-contained TTI shown in FIGS. 1A and 1B.
- the delay time due to the feedback delay can be shortened.
- uplink data is transmitted 4 TTIs after the TTI that received the downlink control signal, so that the delay time due to the allocation delay can be shortened by using the self-contained TTI shown in FIG. 1B.
- FIG. 2 is a diagram illustrating an example of a plurality of TTIs that are frequency division multiplexed.
- TTIs # 1 and # 2 having different time lengths are frequency division multiplexed.
- a guard subcarrier is provided between TTI # 1 and # 2 to reduce the influence of frequency shift due to the Doppler effect.
- TTI # 1 and # 2 can have different radio parameters in addition to the time length.
- a normal CP short CP
- an extended CP long CP
- the time length (number of symbols) of the reference signal (RS) / downlink control (DL control) area and data area can be set freely.
- a multi-use (Flex) region used for downlink / uplink multi-use signals may be provided.
- the present invention has been conceived as an aspect that a plurality of TTIs having different radio parameters can be appropriately frequency-division multiplexed by applying a self-contained radio interface in the frequency domain.
- the TTI may be the same 1 ms as that of the existing LTE system, may be shorter than 1 ms, or may be longer than 1 ms.
- the TTI may be a self-contained TTI (that is, a self-contained transmission in the time domain) or a TTI that is not self-contained.
- each symbol length in the TTI may be the same as that of the existing LTE system, may be shorter than the existing LTE system, or may be longer than the existing LTE system.
- the subcarrier interval may be N times that of the existing LTE system.
- the subcarrier interval may be 1 / N times that of the existing LTE system.
- the number of symbols in the TTI may be the same as or different from the existing LTE system.
- FIG. 3 is a diagram showing an example of self-contained transmission in the frequency domain according to the present embodiment. As shown in FIG. 3, in the present embodiment, a plurality of physical subbands (PSBs) obtained by blocking the total band are provided.
- PSBs physical subbands
- the total band is an entire frequency band that can be used by the user terminal, such as a system band, a component carrier (CC), and a carrier.
- the PSB is a frequency block configured by blocking the total band, and is configured by one or more frequency units (for example, a resource block (PRB: Physical Resource Block), a subcarrier, etc.).
- the PSB may be referred to as a subband. In FIG. 3, 4 PSBs are provided in the total band, but the number of PSBs in the total band is not limited to this.
- Different radio parameters for example, symbol length, subcarrier interval, TTI length, CP length, ACK / NACK transmission timing, signal configuration, etc.
- number for example, symbol length, subcarrier interval, TTI length, CP length, ACK / NACK transmission timing, signal configuration, etc.
- different wireless access methods such as 5G and 5G + can be mixed in the same total band.
- communication of a plurality of services for example, eMBB, IoT, etc.
- orthogonalization within the PSB by OFDM Orthogonal Frequency Division Multiplexing
- OFDM Orthogonal Frequency Division Multiplexing
- a filter OFDM with windowing or filtering
- interference between PSBs may be prevented by providing guard subcarriers (guard bands) between PSBs.
- orthogonalization within the PSB may be realized by SC-FDMA (Single Carrier Frequency Division Multiple Access).
- downlink / uplink the frequency at which downlink and / or uplink (hereinafter referred to as downlink / uplink) communication (for example, scheduling, data transmission, retransmission control, etc.) is completed within a single PSB. Area-self-contained transmission is applied.
- the user terminal receives a downlink control signal (DL control signal) including downlink data signal allocation information, and receives a downlink data signal (Data) based on the allocation information. Further, the user terminal transmits a UL control signal (UL control signal) including acknowledgment information (hereinafter also referred to as ACK / NACK) of the downlink data signal.
- DL control signal downlink control signal
- DL data signal downlink data signal allocation information
- Data downlink data signal
- UL control signal UL control signal
- UL control signal UL control signal
- acknowledgment information hereinafter also referred to as ACK / NACK
- the user terminal receives a downlink control signal (DL control signal) including uplink data signal allocation information, and transmits an uplink data signal (Data) based on the allocation information.
- the user terminal receives a UL control signal (UL control signal) including ACK / NACK of the uplink data signal.
- DL control signal downlink control signal
- UL control signal UL control signal
- the downlink control signal, the uplink data signal, and the UL control signal are time-division multiplexed in the same PSB (mapped to different time domains in the same PSB).
- TTIs having different radio parameters are arranged in different PSBs and completed for each PSB. Communication is applied. For this reason, even when a plurality of TTIs having different radio parameters are frequency division multiplexed, communication can be performed appropriately, and scalability in the frequency domain can be improved.
- the downlink control signal, the downlink data signal, and the UL control signal included in the same PSB may be included in the same TTI (that is, self-contained). Type TTI).
- the downlink control signal, the uplink data signal, and the UL control signal included in the same PSB may be included in the same TTI (that is, self-contained TTI). May be).
- the expandability of both the frequency domain and the time domain can be improved.
- FIG. 4 is a diagram illustrating an example of multi-user / layer transmission within the PSB according to the present embodiment.
- one PSB of the four PSBs shown in FIG. 3 is shown as an example.
- transmission of a plurality of user terminals or transmission of a plurality of layers may be performed. Note that FIG. 4 is applicable to both uplink and downlink.
- frequency scheduling in the PSB may not be performed.
- a plurality of data signals are multiplexed on the same frequency resource (for example, the entire PSB in FIG. 4) in the same PSB.
- MU-MIMO Multi-User Multi-Input Multi-Output
- CoMP Coordinatd Multi-Point
- NAICS Network-Assisted Interference Cancellation and Suppression
- NOMA Non -Orthogonal Multiple Access
- BF beam forming
- a plurality of user terminals are multiplexed on the same time / frequency resource using spatial multiplexing and precoding.
- NAICS / NOMA on the premise of interference cancellation on the receiving side, a plurality of user terminals are multiplexed on the same time / frequency resource with different transmission power.
- beam forming a plurality of user terminals are multiplexed on the same time / frequency resource using precoding.
- CoMP coordinated transmission is performed by a plurality of radio base stations.
- the channel estimation accuracy can be improved similarly to PRB bundling in the LTE system. Can do. Also, scheduling can be simplified when a plurality of data signals are multiplexed on the same PSB by the MU-MIMO, CoMP, NAICS / NOMA, and beamforming.
- the plurality of downlink control signals including the allocation information of the plurality of data signals may be frequency division multiplexed in the PSB.
- Data signals are retransmitted even if reception fails due to retransmission control, but downlink control signals are not retransmitted even if reception fails, so it is desirable to improve reception quality.
- the reception quality of the plurality of downlink control signals can be improved as compared to a plurality of data signals multiplexed on the same frequency resource in the PSB. .
- the uplink control signal including ACK / NACK of the plurality of data signals may be frequency division multiplexed in the PSB.
- the number N cont of frequency resources (DL control resources) for downlink control signals in the PSB and the number N A / N of frequency resources (UL A / N resources) for uplink control signals in the PSB are: It may be set equal.
- the frequency resource for the downlink control signal and the frequency resource for the uplink control signal in the PSB may correspond one-to-one.
- the user terminal may blind-decode four frequency resources in the PSB and detect a downlink control signal for the user terminal.
- the user terminal receives a data signal mapped to the entire PSB based on the detected downlink control signal.
- the user terminal transmits an uplink control signal including ACK / NACK for the data signal using a frequency resource corresponding to the frequency resource in which the downlink control signal is detected.
- the user terminal jointly encodes ACK / NACK of the plurality of data signals, and transmits the joint-coded ACK / NACK using the entire PSB or a specific frequency resource in the PSB. May be.
- FIG. 5 is an explanatory diagram of the bandwidth of the PSB according to the present embodiment. 3 and 4, a plurality of PSBs having the same bandwidth are provided in the total band, but the present invention is not limited to this. As shown in FIG. 5A, a plurality of PSBs having different bandwidths may be provided in the total band. Note that FIG. 5A is applicable to both uplink and downlink.
- two narrow-band PSBs (Narrower PSBs), a wide-band PSB having a wider bandwidth than the narrow-band PSB (Wider PSB), and an ultra-wideband having a wider bandwidth than the wide-band PSB in the total band.
- PSB Very wide PSB
- the narrowband PSB is, for example, a PSB having a maximum bandwidth of 2.5 MHz (narrowband), and is suitable for transmission / reception of a data signal having a small packet size.
- the wideband PSB is, for example, a PSB having a maximum bandwidth (wideband) of 20 MHz.
- the ultra-wideband PSB is, for example, a PSB having a maximum bandwidth (ultra-wideband) of 100 MHz, and is suitable for transmission / reception of large-capacity data.
- By providing a plurality of PSBs having different bandwidths in the total band it is possible to efficiently support transmission / reception of data signals having various packet sizes.
- Each PSB has a bandwidth selected from the plurality of bandwidths (for example, narrow band, wide band, and ultra wide band). Different resource mappings are applied to the downlink control signals for the plurality of bandwidths, and the assigned PRB for the user terminal is detected by monitoring the search space by the user terminal.
- FIG. 5B is a diagram illustrating an example of detection of assigned PSBs for user terminals.
- PSB downlink control signals of different bandwidths may be mapped in different formats.
- FIG. 5B shows 4 search spaces (candidate areas) for 2 narrowband PSBs, 2 search spaces for wideband PSBs, and 2 search spaces for ultrawideband PSBs.
- search spaces to which downlink control signals of PSBs with different bandwidths are mapped are configured in different frequency units.
- one search space (candidate area) for PSB for narrow band is configured in units of one frequency
- one search space for PSB for wide band is configured in units of eight frequencies
- One search space for PSB may be configured in units of 24 frequencies.
- the frequency unit constituting each search space may be referred to as a control channel element (CCE).
- CCE control channel element
- the user terminal monitors the PSB search space for all bandwidths and detects a downlink control signal addressed to the user terminal.
- the user terminal detects the PSB from which the downlink control signal is detected as an assigned PRB for the user terminal. In this way, even when a plurality of PSBs having different bandwidths are provided in the total band, by performing blind decoding on the search space of the plurality of PSBs, it is possible to determine which bandwidth PSB the user terminal performs communication with. Can be detected.
- the allocated PSB for the user terminal may be notified by a downlink control signal (hereinafter referred to as a PSB instruction signal) different from the downlink control signal including the data signal allocation information.
- the PSB instruction signal includes instruction information on the bandwidth of the allocated PRB for the user terminal.
- the PSB indication signal may be mapped to the first symbol in the TTI.
- FIG. 6 is a diagram showing an example of local / distributed mapping of PSBs according to the present embodiment.
- FIG. 6 as shown in FIG. 5, local mapping (distributed mapping) and distributed mapping (distributed mapping) when a plurality of PSBs having different bandwidths are provided will be described. Note that the local mapping described below is also applicable when a plurality of PSBs having the same bandwidth are provided, as shown in FIGS. FIG. 6 is applicable to both uplink and downlink.
- VSBs virtual subbands
- PSB physical resource area
- VSBs # 1 to # 4 are each divided into two, and the divided VSBs are mapped to symmetrical frequency positions around the center frequency of the total band.
- the same PSB is composed of two different frequency resources that are symmetrical about the center frequency. For this reason, PSB frequency diversity effect can be obtained in dispersion mapping.
- FIG. 7 is a diagram showing an example of local / distributed mapping of the downlink control signal according to the present embodiment. As shown in FIG. 7, a case where a plurality of downlink control signals # 1 to # 4 are frequency division multiplexed in the PSB is shown, but the present invention can also be applied to an uplink control signal.
- downlink control signals # 1 to # 4 that are frequency division multiplexed in the PSB are mapped to virtual frequency resources (hereinafter abbreviated as virtual resources), and then directly , Mapped to physical frequency resources (hereinafter abbreviated as physical resources) in the PSB.
- virtual resources hereinafter abbreviated as virtual resources
- physical resources hereinafter abbreviated as physical resources
- downlink control signals # 1 to # 4 are mapped to virtual resources and then divided into two, and the divided virtual resources are the center of the total band. It is mapped to a frequency position that is symmetric about the frequency.
- the physical resource to which the same downlink control signal is mapped is composed of two different frequency resources that are symmetrical about the center frequency. For this reason, in distributed mapping, downlink control signals are interleaved, and a frequency diversity effect can be obtained.
- FIG. 8 is a diagram illustrating a scheduling example according to the present embodiment.
- FIG. 8 shows an example in which the total band is composed of PSBs # 1 to # 4 having the same bandwidth, as described above, the present invention is not limited to this. Note that FIG. 8 is applicable to both uplink and downlink.
- FIG. 8A shows an example of cross PSB scheduling in which data signals are allocated with downlink control signals of different PSBs.
- the PSB # 1 downlink control signal includes PSB # 3 data signal allocation information.
- the user terminal receives the data signal of PSB # 3 based on the allocation information.
- a user terminal transmits UL control signal containing ACK / NACK of the said data signal by PSB # 1.
- FIG. 8B shows an example of multi-PSB scheduling in which a plurality of PSB data signals are allocated by a single PSB downlink control signal.
- the PSB # 1 downlink control signal includes PSB # 1 and # 3 data signal allocation information.
- the user terminal receives the data signals of PSB # 1 and # 3 based on the allocation information.
- a user terminal transmits UL control signal containing ACK / NACK of the said data signal by PSB # 1.
- ACK / NACK for the data signals of PSB # 1 and # 3 may be jointly encoded or may be independently encoded.
- FIG. 9 is a diagram showing an example of anchor-carrier assisted access according to the present embodiment.
- An anchor carrier is a carrier that provides time-domain synchronization and basic system information, and is equivalent to a PSB.
- a booster carrier is a carrier that performs communication based on synchronization with anchor carriers or system information, and is equal to PSB.
- the anchor carrier is also called a primary carrier, a primary cell, a PCell, or the like.
- a booster carrier is also called a secondary carrier, a secondary cell, SCell, etc.
- an anchor carrier is provided inside the booster carrier as shown in FIG. 9A, and an anchor carrier is provided outside the booster carrier as shown in FIG. 9B.
- FIG. 9C a dual anchor in which a main anchor carrier and a secondary anchor carrier are provided as shown in FIG. 9C can be considered. Note that the scenario shown in FIGS. 9A-9C is merely an example, and the present invention is not limited to this.
- the anchor carrier may be an existing LTE system (for example, Rel. 12 or earlier) or a wireless communication system (for example, Rel. 13, 14) that is an extension of the existing LTE system.
- the booster carrier may be a future wireless communication system such as 5G, 5G +.
- FIG. 10 is a diagram showing an example of physical channels / signals supported by the anchor / booster carrier according to the present embodiment.
- a synchronization signal in the main anchor carrier, a synchronization signal, a broadcast channel, a discovery reference signal (or a reference signal for mobility), a random access channel, a downlink / uplink data channel, a downlink L1 / L2 control signal, Uplink L1 / L2 control signals, CSI-RS (Channel State Information-Reference Signal), and SRS (Sounding Reference Signal) may be transmitted.
- CSI-RS Channel State Information-Reference Signal
- SRS Sounding Reference Signal
- the synchronization signal may not be transmitted fixedly like the main anchor carrier, but may be transmitted semi-statically.
- the broadcast channel may not be transmitted on the slave anchor carrier. Further, the booster carrier does not have to transmit the synchronization signal and the broadcast channel.
- control information related to PSB may be transmitted using higher layer signaling (for example, RRC signaling, broadcast information (MIB, SIB), etc.), a downlink control signal, or a combination thereof.
- higher layer signaling for example, RRC signaling, broadcast information (MIB, SIB), etc.
- control information related to the PSB includes an allocation PRB for the user terminal 20 and information indicating radio parameters (eg, symbol length, subcarrier interval, TTI length, CP length, signal configuration, etc.) used in the PSB. May be.
- radio parameters eg, symbol length, subcarrier interval, TTI length, CP length, signal configuration, etc.
- wireless communication system Wireless communication system
- wireless communication method is applied.
- wireless communication method may be applied independently, and may be applied in combination.
- FIG. 11 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.
- DC dual connectivity
- the wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced 4G (4th generation mobile communication system), 5G. (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced 4G (4th generation mobile communication system)
- 5G. 5th generation mobile communication system
- FRA Full Radio Access
- New-RAT Radio Access Technology
- a radio communication system 1 shown in FIG. 11 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. -12c). Moreover, the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously by CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).
- orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
- 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 scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH.
- HARQ Hybrid Automatic Repeat reQuest
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used.
- PUSCH uplink shared channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by PUSCH.
- downlink radio quality information CQI: Channel Quality Indicator
- delivery confirmation information and the like are transmitted by PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- a cell-specific reference signal CRS
- CSI-RS channel state information reference signal
- DMRS demodulation reference signal
- PRS Positioning Reference Signal
- a measurement reference signal SRS: Sounding Reference Signal
- a demodulation reference signal DMRS
- the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
- FIG. 12 is a diagram illustrating an example of the overall configuration of the radio base station according to the embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ transmission processing
- scheduling transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing
- IFFT Inverse Fast Fourier Transform
- precoding processing precoding processing, and other transmission processing
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device which is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- the transmission / reception unit 103 transmits a downlink control signal including downlink data signal allocation information (scheduling information, DL assignment). Further, the transmission / reception unit 103 transmits a downlink data signal. Further, the transmission / reception unit 103 receives an uplink control signal including ACK / NACK of the downlink data signal.
- the transmission / reception unit 103 transmits a downlink control signal including uplink data signal allocation information (scheduling information, UL grant). Further, the transmission / reception unit 103 receives an uplink data signal transmitted based on the allocation information. Further, the transmission / reception unit 103 transmits an uplink control signal including ACK / NACK of the uplink data signal.
- the transmission / reception unit 103 transmits control information related to the PSB.
- the transmission / reception unit 103 may transmit control information related to PSB using higher layer signaling (eg, RRC signaling, broadcast information (MIB, SIB), etc.), a downlink control signal, or a combination thereof.
- higher layer signaling eg, RRC signaling, broadcast information (MIB, SIB), etc.
- FIG. 13 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 13 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 13, the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. ing.
- the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. ing.
- the control unit (scheduler) 301 controls the entire radio base station 10.
- the control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
- the control unit 301 controls signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example.
- the control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
- the control unit 301 controls scheduling (for example, resource allocation) of system information, downlink data signals (for example, PDSCH), and downlink control signals (for example, PDCCH / EPDCCH). Further, the control unit 301 controls the generation of the downlink data signal based on ACK / NACK from the user terminal 20. Further, the control unit 301 controls generation of an uplink control signal including ACK / NACK based on the determination result of the uplink data signal from the user terminal 20. The control unit 301 also controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals such as CRS, CSI-RS, and DMRS.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- control unit 301 controls scheduling of an uplink data signal (for example, PUSCH), an uplink control signal (for example, PUCCH), a random access preamble transmitted by PRACH, and an uplink reference signal (for example, SRS).
- an uplink data signal for example, PUSCH
- an uplink control signal for example, PUCCH
- an uplink reference signal for example, SRS
- control unit 301 may form a plurality of PSBs (frequency domain units) in which the total band (the entire frequency band) is blocked.
- control unit 301 may perform control so that communication is performed using a TTI with different radio parameters for each PSB.
- the control unit 301 may allocate different time resources in the same PSB to the downlink control signal, the downlink data signal, and the uplink control signal. .
- the downlink control signal, downlink data signal, and uplink control signal are time-division multiplexed in the same PSB (FIG. 3).
- the control signal 301 may assign different time resources in the same TTI in the same PSB to the downlink control signal, the downlink data signal, and the uplink control signal.
- the control unit 301 may allocate different time resources in the same PSB to the downlink control signal, the uplink data signal, and the uplink control signal. .
- the downlink control signal, the uplink data signal, and the uplink control signal are time-division multiplexed in the same PSB (FIG. 3).
- the control signal 301 may assign different time resources in the same TTI in the same PSB to the downlink control signal, the uplink data signal, and the uplink control signal.
- control unit 301 may frequency-division multiplex a plurality of downlink control signals in the same PSB (may be assigned to different frequency resources in the same PSB) (FIG. 4). Further, the control unit 301 may multiplex a plurality of data signals in the same time / frequency resource in the same PSB using, for example, MU-MIMO, CoMP, SAICS / NOMA, and beamforming.
- the frequency resource number N cont for downlink control signals is equal to the frequency resource number A A / N for uplink control signals, and may correspond 1: 1.
- control unit 301 may set a bandwidth selected from a plurality of bandwidths (options) for the PSB (FIG. 5A). In this case, the control unit 301 may apply different resource mappings for a plurality of bandwidths to the downlink control signal (FIG. 5B). That is, the control unit 301 may apply different resource mapping for each bandwidth to the downlink control signal.
- control unit 301 may perform local mapping or distributed mapping of a plurality of PSBs within the total band (FIGS. 6A and 6B).
- distributed mapping the control unit 301 virtually maps the downlink data signal and / or downlink control signal to the VSB, converts the VSB to the PSB according to a predetermined rule, and performs the physical mapping so as to perform physical mapping. May be controlled.
- control unit 301 may perform local mapping or distributed mapping of the downlink control signal within the same PSB (FIGS. 7A and 7B).
- distributed mapping the control unit 301 virtually maps the downlink control signal to the virtual resource in the same resource, converts the virtual resource to the physical resource according to a predetermined rule, and performs the physical mapping so as to perform the physical mapping.
- 303 may be controlled.
- control unit 301 may perform cross PSB scheduling or multi-PSB scheduling on the downlink data signal and / or the uplink data signal (FIGS. 8A and 8B).
- control unit 301 may set one of a plurality of PSBs in the total band as an anchor carrier (FIG. 9).
- the control unit 301 includes a synchronization signal, a broadcast channel, a discovery reference signal (or a reference signal for mobility), a random access channel, a downlink / uplink data channel, a downlink L1 / L2 control signal, Control may be performed so that at least one of the uplink L1 / L2 control signal, CSI-RS, and SRS is transmitted (FIG. 10).
- control unit 301 generates control information related to the PSB and notifies the user terminal 20 using higher layer signaling (for example, RRC signaling, broadcast information (MIB, SIB), etc.), a downlink control signal, or a combination thereof. You may control as follows.
- higher layer signaling for example, RRC signaling, broadcast information (MIB, SIB), etc.
- the transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303.
- the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates, for example, a downlink control signal including downlink data signal allocation information and an uplink control signal including uplink data signal allocation information based on an instruction from the control unit 301.
- the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.
- CSI Channel State Information
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103.
- the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
- the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301.
- the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 may measure, for example, received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 301.
- FIG. 14 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 receives a downlink control signal including downlink data signal allocation information (scheduling information, DL assignment). Further, the transmission / reception unit 203 receives a downlink data signal based on the allocation information. Further, the transmission / reception unit 203 transmits an uplink control signal including ACK / NACK of the downlink data signal.
- a downlink control signal including downlink data signal allocation information (scheduling information, DL assignment). Further, the transmission / reception unit 203 receives a downlink data signal based on the allocation information. Further, the transmission / reception unit 203 transmits an uplink control signal including ACK / NACK of the downlink data signal.
- the transmission / reception unit 203 receives a downlink control signal including uplink data signal allocation information (scheduling information, UL grant). Further, the transmission / reception unit 203 transmits an uplink data signal based on the allocation information. Further, the transmission / reception unit 203 receives an uplink control signal including ACK / NACK of the uplink data signal.
- the transmission / reception unit 203 receives control information related to the PSB.
- the transmission / reception unit 203 may receive control information related to the PSB using higher layer signaling (eg, RRC signaling, broadcast information (MIB, SIB), etc.), a downlink control signal, or a combination thereof.
- higher layer signaling eg, RRC signaling, broadcast information (MIB, SIB), etc.
- FIG. 15 is a diagram illustrating an example of a functional configuration of the user terminal according to the embodiment of the present invention. Note that FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 15, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. At least.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403.
- the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
- the control unit 401 acquires the downlink control signal (for example, PDCCH / EPDCCH) and the downlink data signal (for example, PDSCH) transmitted from the radio base station 10 from the received signal processing unit 404.
- the control unit 401 controls the generation of the uplink data signal based on the downlink control signal and / or the ACK / NACK from the radio base station 10. Further, the control unit 401 controls generation of an uplink control signal including ACK / NACK based on the determination result of the downlink data signal.
- control unit 401 may set at least one PSB used for communication of the user terminal 20 based on information on the PSB from the radio base station 10.
- the control unit 401 receives a downlink control signal including downlink data signal allocation information and the downlink data signal, and ACK / Control may be performed so that transmission of an uplink control signal including NACK is performed using different time resources within the same PSB (FIG. 3). Further, the control unit 401 may perform control so that the reception of the downlink control signal and the downlink data signal and the transmission of the uplink control signal are performed with different time resources in the same TTI in the same PSB. .
- the control unit 401 receives a downlink control signal including uplink data signal allocation information, transmits the uplink data signal, and transmits the uplink data signal. Control may be performed so that reception of an uplink control signal including ACK / NACK with respect to is performed using different time resources within the same PSB (FIG. 3). Further, the control unit 401 may control to perform reception of the downlink control signal and the uplink control signal and transmission of the downlink data signal with different time resources in the same TTI in the same PSB. Good.
- control unit 401 performs blind decoding on a plurality of downlink control signals that are frequency division multiplexed (assigned to different frequency resources) within the same PSB (FIG. 4). Specifically, the control unit 401 monitors the search space and detects a downlink control signal addressed to the user terminal 20. Further, the control unit 401 may perform control based on the detected downlink control signal so as to demodulate the downlink data signal multiplexed in the PSB by MU-MIMO, CoMP, SAICS / NOMA, and beamforming.
- control unit 401 may perform control so that the uplink control signal is transmitted using the frequency resource corresponding to the frequency resource in which the detected downlink control signal is detected.
- the control unit 401 performs blind decoding on the resource mapping format (search space) of the entire bandwidth.
- a downlink control signal addressed to the user terminal 20 may be detected (FIG. 5B).
- control unit 401 may perform local mapping or distributed mapping of a plurality of PSBs in the total band (FIGS. 6A and 6B).
- distributed mapping the control unit 401 virtually maps the uplink data signal and / or the uplink control signal to the VSB, converts the VSB to the PSB according to a predetermined rule, and performs the physical mapping so as to perform physical mapping. May be controlled.
- control unit 401 may perform local mapping or distributed mapping of the uplink control signal within the same PSB (FIGS. 7A and 7B).
- distributed mapping the control unit 401 virtually maps an uplink control signal to a virtual resource in the same resource, converts the virtual resource to a physical resource according to a predetermined rule, and performs the physical mapping. 403 may be controlled.
- control unit 401 may perform control so as to receive a downlink data signal and / or transmit an uplink data signal by cross PSB scheduling or multi-PSB scheduling (FIGS. 8A and 8B).
- control unit 401 may set one of a plurality of PSBs in the total band as an anchor carrier (FIG. 9).
- the control unit 401 includes a synchronization signal, a broadcast channel, a discovery reference signal (or a reference signal for mobility), a random access channel, a downlink / uplink data channel, a downlink L1 / L2 control signal, Control may be performed so as to receive at least one of the uplink L1 / L2 control signal, CSI-RS, and SRS (FIG. 10).
- the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403.
- the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generator 402 generates an uplink control signal related to delivery confirmation information and channel state information (CSI) based on an instruction from the controller 401, for example.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203.
- the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
- the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10.
- the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the received signal processing unit 404 performs blind decoding on DCI (DCI format) for scheduling transmission and / or reception of data (TB: Transport Block) based on an instruction from the control unit 401.
- DCI DCI format
- TB Transport Block
- the received signal processing unit 404 may be configured to perform blind decoding on different radio resources based on whether or not the self-contained subframe.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 may output the data decoding result to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 may measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 401.
- each functional block (components) are realized by any combination of hardware and / or software.
- the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- a wireless base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the wireless communication method of the present invention.
- FIG. 16 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input.
- the output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- the notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- the information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI downlink control information
- UCI uplink control information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- MAC CE Control Element
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable wireless communication methods and / or based on them It may be applied to an extended next generation system.
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Abstract
Description
以下、本発明の一実施の形態に係る無線通信方法について説明する。なお、本実施の形態において、TTIは、既存のLTEシステムと同一の1msであってもよいし、1msより短くてもよいし、1msより長くてもよい。また、TTIは、自己完結型TTI(すなわち、時間領域における自己完結型送信)であってもよいし、自己完結型でないTTIであってもよい。
図3は、本実施の形態に係る周波数領域における自己完結型送信の一例を示す図である。図3に示すように、本実施の形態では、トータルバンドをブロック化した複数の物理サブバンド(PSB:Physical SubBand)が設けられる。
図4は、本実施の形態に係るPSB内でのマルチユーザ/レイヤ送信の一例を示す図である。図4では、図3で示される4つのPSBのうちの一つのPSBが一例として示される。図3に示すように、各PSBでは、複数のユーザ端末の送信又は複数のレイヤの送信が行われてもよい。なお、図4は、上りと下りとの双方に適用可能である。
図5は、本実施の形態に係るPSBの帯域幅の説明図である。図3及び図4では、トータルバンド内に帯域幅が等しい複数のPSBが設けられるが、これに限られない。図5Aに示すように、トータルバンド内には、異なる帯域幅の複数のPSBが設けられてもよい。なお、図5Aは、上りと下りとの双方に適用可能である。
図6は、本実施の形態に係るPSBの局所/分散マッピングの一例を示す図である。図6では、図5に示すように、異なる帯域幅の複数のPSBが設けられる場合における局所マッピング(localized mapping)及び分散マッピング(distributed mapping)について説明する。なお、以下で説明する局所マッピングは、図3及び4に示すように、帯域幅が等しい複数のPSBが設けられる場合にも適用可能である。また、図6は、上りと下りとの双方に適用可能である。
図8は、本実施の形態に係るスケジューリング例を示す図である。なお、図8では、トータルバンドが、帯域幅の等しいPSB#1~#4で構成される例を示すが、上述のように、これに限られない。なお、図8は、上りと下りとの双方に適用可能である。
以下、本発明の一実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記無線通信方法が適用される。なお、上記無線通信方法で説明した各態様は、単独で適用されてもよいし、組み合わせて適用されてもよい。
図12は、本発明の一実施の形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。なお、送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されればよい。
図14は、本発明の一実施の形態に係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、複数の送受信アンテナ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、アプリケーション部205と、を備えている。なお、送受信アンテナ201、アンプ部202、送受信部203は、それぞれ1つ以上を含むように構成されればよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的に結合した1つの装置により実現されてもよいし、物理的に分離した2つ以上の装置を有線又は無線で接続し、これら複数の装置により実現されてもよい。
Claims (10)
- 下りデータ信号の割り当て情報を含む下り制御信号を受信し、前記下り制御信号に基づいて前記下りデータ信号を受信する受信部と、
前記下りデータ信号の送達確認情報を含む上り制御信号を送信する送信部と、を具備し、
全体の周波数帯域がブロック化された複数の周波数領域単位が形成され、
前記下り制御信号と前記下りデータ信号と前記上り制御信号とが、同一の周波数領域単位内で時分割多重されることを特徴とするユーザ端末。 - 上りデータ信号の割り当て情報を含む下り制御信号を受信し、前記上りデータ信号の送達確認情報を含む上り制御信号を受信する受信部と、
前記下り制御信号に基づいて前記上りデータ信号を送信する送信部と、を具備し、
全体の周波数帯域がブロック化された複数の周波数領域単位が形成され、
前記下り制御信号と前記上りデータ信号と前記上り制御信号とが、同一の周波数領域単位で時分割多重されることを特徴とするユーザ端末。 - 前記下り制御信号は、前記同一の周波数領域単位内で他のユーザ端末の下り制御信号と周波数分割多重されることを特徴とする請求項1又は請求項2に記載のユーザ端末。
- 前記上り制御信号は、前記同一の周波数領域単位内で他のユーザ端末の上り制御信号と周波数分割多重されることを特徴とする請求項1から請求項3のいずれかに記載のユーザ端末。
- 前記同一の周波数領域単位内において、下り制御信号用の周波数リソース数と上り制御信号用の周波数リソース数とは等しく、
前記上り制御信号は、前記下り制御信号が検出された周波数リソースに対応する周波数リソースを用いて送信されることを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。 - 前記同一の周波数領域単位は、複数の帯域幅から選択される帯域幅を有し、
前記下り制御信号には、前記複数の帯域幅でそれぞれ異なるリソースマッピングが適用されることを特徴とする請求項1から請求項5のいずれかに記載のユーザ端末。 - 前記複数の周波数領域単位における信号伝送は、仮想リソース領域で行われた後、物理リソース領域に変換されることを特徴とする請求項1から請求項6のいずれかに記載のユーザ端末。
- 前記複数の周波数領域単位の一つにおいて、同期信号が送信されることを特徴とする請求項1から請求項7のいずれかに記載のユーザ端末。
- 下りデータ信号の割り当て情報を含む下り制御信号を送信し、前記下りデータ信号を送信する送信部と、
前記下りデータ信号の送達確認情報を含む上り制御信号を受信する受信部と、を具備し、
全体の周波数帯域がブロック化された複数の周波数領域単位が形成され、
前記下り制御信号と前記下りデータ信号と前記上り制御信号とが、同一の周波数領域単位内で時分割多重されることを特徴とする無線基地局。 - 下りデータ信号の割り当て情報を含む下り制御信号を受信する工程と、
前記下り制御信号に基づいて前記下りデータ信号を受信する工程と、
前記下りデータ信号の送達確認情報を含む上り制御信号を送信する工程と、を有し、
全体の周波数帯域がブロック化された複数の周波数領域単位が形成され、
前記下り制御信号と前記下りデータ信号と前記上り制御信号とが、同一の周波数領域単位内で時分割多重されることを特徴とする無線通信方法。
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US20190074944A1 (en) | 2019-03-07 |
CN108702754A (zh) | 2018-10-23 |
SG11201807231QA (en) | 2018-09-27 |
EP3425977A4 (en) | 2019-08-28 |
CN108702754B (zh) | 2023-05-16 |
JPWO2017150447A1 (ja) | 2018-12-20 |
US11677521B2 (en) | 2023-06-13 |
JP2022111245A (ja) | 2022-07-29 |
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