US20160338049A1 - User terminal, radio base station and radio communication method - Google Patents

User terminal, radio base station and radio communication method Download PDF

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Publication number
US20160338049A1
US20160338049A1 US15/110,958 US201515110958A US2016338049A1 US 20160338049 A1 US20160338049 A1 US 20160338049A1 US 201515110958 A US201515110958 A US 201515110958A US 2016338049 A1 US2016338049 A1 US 2016338049A1
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Prior art keywords
uplink
user terminal
special subframe
time duration
uppts
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US15/110,958
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English (en)
Inventor
Kazuki Takeda
Tooru Uchino
Kazuaki Takeda
Satoshi Nagata
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAGATA, SATOSHI, TAKEDA, KAZUAKI, TAKEDA, KAZUKI, UCHINO, Tooru
Publication of US20160338049A1 publication Critical patent/US20160338049A1/en
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the present invention relates to a user terminal, a radio base station and a radio communication method that are applicable to a next-generation communication system.
  • LTE Long term evolution
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • LTE-advanced or “LTE enhancement” (hereinafter referred to as “LTE-A”)
  • LTE-A LTE enhancement
  • FDD frequency division duplex
  • TDD time division duplex
  • UL/DL configurations In TDD in LTE systems, a plurality of frame configurations (UL/DL configurations) with varying transmission ratios between uplink subframes (UL subframes) and downlink subframes (DL subframes) are stipulated.
  • UL/DL configurations seven frame configurations—namely, UL/DL configurations 0 to 6 —are stipulated, where subframes # 0 and # 5 are allocated to the downlink, and subframe # 2 is allocated to the uplink.
  • UL/DL configuration a special subframe is configured where a switch is made from DL to UL.
  • the system band of LTE-A systems includes at least one component carrier (CC), where the LTE system band constitutes one unit. Gathering a plurality of component carriers (cells) to make a wide band is referred to as “carrier aggregation” (CA).
  • CA carrier aggregation
  • Non-Patent Literature 1 3GPP TS 36.300 “Evolved UTRA and Evolved UTRAN Overall Description”
  • CA carrier aggregation
  • TDD time division duplex spectroscopy
  • DL traffic and UL traffic are asymmetrical.
  • the ratio between DL traffic and UL traffic is not constant, and varies over time or between locations. So, in order to enable flexible switching of UL/DL configurations in accordance with traffic, Rel. 11 provided support for CA (TDD inter-band CA) to employ different UL/DL configurations between different cells.
  • CA carrier aggregation
  • the duplex modes to apply between a plurality of CCs need to be the same duplex mode (see FIG. 1B ).
  • future radio communication systems for example, Rel. 12 and later versions
  • CA may anticipate CA to employ different duplex modes (TDD+FDD) between multiple CCs (see FIG. 1C ).
  • the present invention has been made in view of the above, and it is therefore an object of the present invention to provide a user terminal, a radio base station and a radio communication method, which can improve throughput, and which furthermore can support various modes of use of radio communication systems when TDD is used in an environment in which the data traffic is unevenly concentrated on the downlink.
  • the user terminal provides a user terminal that carries out radio communication with a TDD cell, and this user terminal has a transmitting/receiving section that transmits and receives signals by using a UL/DL configuration, which includes a special subframe formed with a downlink time duration, a guard period and an uplink time duration, and in which DL communication is carried out in all subframes, and a control section that controls an arrangement of an uplink demodulation reference signal based on a length of the uplink time duration constituting the special subframe.
  • the present invention it is possible to improve throughput and furthermore support various modes of use of radio communication systems when TDD is used in an environment in which the data traffic is unevenly concentrated on the downlink.
  • FIG. 1 provide diagrams to explain an overview of duplex modes in LTE and LTE-A, and intra-base station CA (intra-eNB CA);
  • FIG. 2 is a diagram to show UL/DL configurations for use in TDD cells of existing systems
  • FIG. 3 provide diagrams to show examples of UL/DL configurations 7 for DL communication, for use in TDD cells;
  • FIG. 4 provide diagrams to show examples of system structures where CA is applied to cells that operate in licensed areas and cells that operate in unlicensed areas;
  • FIG. 5 provide diagrams to show existing special subframe configurations
  • FIG. 6 is a diagram to show examples of a DwPTS, a GP, and an extended UpPTS in a special subframe configuration for use in TDD cells;
  • FIG. 7 is a diagram to show other examples of special subframe configurations for use in TDD cells according to an embodiment
  • FIG. 8 provide diagrams to show cases where the length of the UpPTS in a special subframe configuration is extended based on a command from a radio base station;
  • FIG. 9 is a diagram to show an example of a PUSCH format in a special subframe in which the length of the UpPTS is extended;
  • FIG. 10 is a diagram to show an example of a PUSCH format in an existing UP subframe
  • FIG. 11 is a diagram to show the relationship between the number of UpPTS symbols and uplink demodulation reference signals (PUSCH DMRS) placed in the UpPTS;
  • PUSCH DMRS uplink demodulation reference signals
  • FIG. 12 is a diagram to show the relationship between the number of UpPTS symbols and uplink demodulation reference signals (PUSCH DMRS) placed in the UpPTS;
  • PUSCH DMRS uplink demodulation reference signals
  • FIG. 13 is a diagram to show a case where DMRS and SRS are multiplexed over an extended UpPTS;
  • FIG. 14 is a diagram to show examples of operation timing control pertaining to uplink signals to transmit in UL subframes of existing UL/DL configuration 5 ;
  • FIG. 15 is a diagram to show examples of operation timing control pertaining to uplink signals to transmit in special subframes of a new UL/DL configuration 7 ;
  • FIG. 16 is a schematic diagram to show an example of a radio communication system according to the present embodiment.
  • FIG. 17 is a diagram to explain an overall structure of a radio base station according to the present embodiment.
  • FIG. 18 is a diagram to explain a functional structure of a radio base station according to the present embodiment.
  • FIG. 19 is a diagram to explain an overall structure of a user terminal according to the present embodiment.
  • FIG. 20 is a diagram to explain a functional structure of a user terminal according to the present embodiment.
  • future radio communication systems may anticipate CA to employ different duplex modes (TDD+FDD) between multiple CCs (see FIG. 1C ).
  • TDD+FDD duplex modes
  • TDD cells cells where TDD is employed
  • existing systems for example, Rel. 10/11
  • a predetermined cell among a plurality of cells employing CA is used for DL communication in a communication environment where the DL traffic is heavier than the UL traffic.
  • the cell that is selected for DL communication is a cell to employ FDD (hereinafter also referred to as an “FDD cell”)
  • FDD cell FDD
  • DL communication will be possible in every subframe.
  • TDD cell TDD
  • the cell that is selected for DL transmission is a TDD cell, it may be possible to employ the UL/DL configuration in which the configuration ratio of DL subframes is the highest (in FIG. 2 , UL/DL configuration 5 ).
  • a UL subframe and a special subframe are included (SF # 1 and SF # 2 ). That is, because at least a UL subframe is included in existing UL/DL configurations, when a TDD cell is used for DL communication, there will be subframes that cannot be used in DL data communication (for example, SF # 2 ). As a result of this, sufficient improvement of throughput cannot be achieved. Note that, since a special subframe is formed with a downlink time duration (DwPTS), a guard period (GP) and an uplink time uplink time duration (UpPTS), so that DL communication can be carried out using the DwPTS.
  • DwPTS downlink time duration
  • GP guard period
  • UpPTS uplink time uplink time duration
  • UL/DL configuration 7 a UL/DL configuration for DL communication, which enables DL communication in all subframes (hereinafter also referred to as a “UL/DL configuration 7 ”) will be newly introduced. Furthermore, this UL/DL configuration 7 can be suitably applied to cases where a TDD cell is a secondary cell (SCell) (not the primary cell (PCell)).
  • SCell secondary cell
  • PCell primary cell
  • the primary cell refers to the cell that manages RRC connection, handover and so on when CA is executed, and is also a cell that requires UL communication in order to receive data and feedback signals from terminals.
  • the primary cell is always configured in the uplink and the downlink.
  • a secondary cell refers to another cell that is configured apart from the primary cell when CA is employed.
  • a secondary cell may be configured in the downlink alone, or may be configured in both the uplink and the downlink at the same time.
  • a licensed band refers to a band in which a specific business is allowed exclusive use
  • an unlicensed band refers to a band which is not limited to a specific business and in which radio stations can be provided.
  • Unlicensed bands include, for example, the 2.4 GHz band and the 5 GHz band where WiFi and Bluetooth (registered trademark) can be used, the 60 GHz band where millimeter-wave radars can be used, and so on.
  • an unlicensed band is not for use only by a specific business, and therefore there is a possibility that unpredicted interference is produced.
  • an LTE system and another radio communication system a weather and aircraft surveillance radar, broadcast, emergency radio, public radio, local radio, WiFi, Bluetooth and so on
  • a threat that, between the varying radio communication systems, interference that neither radio communication system has predicted will be produced.
  • the other radio communication system is stipulated to be prioritized over the LTE system. In this case, if the other prioritized radio system is detected to be in operation in the unlicensed band, communication using the LTE system has to stop.
  • Licensed bands allow businesses to control interference by operating base stations, and therefore can be used to communicate control signals and data that requires high quality. Meanwhile, despite the possibility that unpredicted interference may be produced, unlicensed bands can use comparatively wide bands, and therefore can be suitably used in data communication (DL communication) in which the traffic of packets and so on is heavy. Consequently, by executing CA by using UL/DL configuration 7 in TDD cells in unlicensed bands, it is possible to realize communication that takes advantage of both licensed bands and unlicensed bands.
  • DL communication data communication
  • TDD cells which have heretofore been used as secondary cells (SCells) as mentioned earlier, as cells that allow connection even when CA is not configured (that is, without requiring communication by the primary cell (PCell) as a precondition).
  • SCells secondary cells
  • SCells secondary cells
  • dual connectivity refers to the mode in which user terminals connect with a plurality of cells that are scheduled independently (that is, have schedulers).
  • the difficulty in this case lies in how to use UL/DL configuration 7 and communicate. That is, in order to use UL/DL configuration 7 in stand-alone or in dual connectivity, it is necessary to support uplink channels, uplink reference signals and so on. For example, it is necessary to at least transmit uplink signals such as the PRACH signal, message 3 in random access procedures, higher layer control signals, downlink HARQ-ACK (delivery acknowledgement signal), CQI (channel quality information), SR (scheduling request signal), SRS (channel quality measurement reference signal) and so on, by using UL/DL configuration 7 .
  • uplink signals such as the PRACH signal, message 3 in random access procedures, higher layer control signals, downlink HARQ-ACK (delivery acknowledgement signal), CQI (channel quality information), SR (scheduling request signal), SRS (channel quality measurement reference signal) and so on.
  • the numbers shown in the table of FIG. 5A are the numbers of OFDM (or SC-FDMA) symbols.
  • the uplink time duration (UpPTS) is configured only up to maximum two symbols. Consequently, it is not possible to transmit user data (PUSCH signals), which is transmitted by using the PUSCH in UL subframes, or uplink control signals (PUCCH signals), which are transmitted by using the PUCCH, and so on.
  • PUSCH signals user data
  • PUCCH signals uplink control signals
  • PRACH signals and SRSs uplink control signals
  • SCell secondary cells
  • UpPTS uplink time duration
  • FIG. 7 shows a table, in which a special subframe configuration 10 (Sp-SF Config. 10 ), in which the UpPTS is extended, is newly provided as a special subframe configuration, in addition to existing special subframe configurations 0 to 9 .
  • the detail of special subframe configuration 10 to be added anew has only to be that the UpPTS is extended longer than heretofore (the UpPTS is at least three symbols or more).
  • an UpPTS like this will be referred to as an “extended UpPTS.”
  • FIG. 7 shows a case where, as special subframe configuration 10 , the DwPTS is “3,” the GP is “2,” and the UpPTS is “9.” That is, the capacity of UL transmission in special subframes is increased by increasing the number of UpPTS symbols, which has heretofore been 1 or 2, up to 9.
  • the special subframe configuration to introduce anew is not limited to one type. It is equally possible to provide a number of special subframe configurations in which the UpPTS is increased to three symbols or more. Also, although an extended UpPTS has only to be at least three symbols or more, an extended UpPTS is preferably four symbols or more, and, even more preferably, five symbols or more. Also, a structure may also be employed here in which special subframe configuration 10 is newly introduced only when UL/DL configuration 7 is used.
  • a structure may also be employed here in which a user terminal uses an existing special subframe configuration and changes the special subframe configuration (extends the UpPTS) based on a special subframe configuration change request signal that is reported on the downlink (see FIG. 8 ).
  • FIG. 8A shows a case where a user terminal having received a special subframe configuration change request signal changes the length of the GP and the length of the UpPTS.
  • the user terminal uses an existing special subframe configuration, like legacy terminals (Rel. 8-11 UEs) do, unless there is a predetermined command (special subframe configuration change request signal) from a radio base station. Meanwhile, when a special subframe configuration change request signal is received, the user terminal executes control so that the length of the UpPTS is extended to three symbols or more and the number of GP symbols is reduced by the number of UpPTS symbols extended.
  • the special subframe configuration change request signal can be reported from the radio base station to the user terminal by using a downlink control signal (for example, a UL grant).
  • FIG. 8B shows a case where a user terminal having received a special subframe configuration change request signal changes the length of the DwPTS and the length of the UpPTS.
  • the user terminal executes control so that the length of the UpPTS is extended to three symbols or more and the number of DwPTS symbols is reduced by the number of UpPTS symbols extended.
  • a synchronization signal is allocated to the second OFDM symbol in the DwPTS (the third OFDM symbol from the subframe top). Consequently, in special subframes, the DwPTS requires three symbols or more (in other words, cannot be made less than three symbols). Also, in order to provide support for timing-advanced, at least one symbol is required for the GP (see FIG. 9 ). Taking these into account, it may be possible to extend the UpPTS up to maximum ten OFDM symbols (from the fourth OFDM symbol to the thirteenth OFDM symbol).
  • uplink control information When uplink control information (UCI) is fed back in a timing to transmit a PUSCH signal, the uplink control information is allocated and transmitted in the PUSCH.
  • a delivery acknowledgement signal (A/N), a rank indicator (RI) and channel quality information (CQI)/precoding matrix indicator (PMI) are multiplexed as shown in FIG. 10 .
  • reference signals for demodulating the PUSCH signal (PUSCH DMRSs) are allocated to the fourth symbol from the top of each slot (the third symbol and the tenth symbol).
  • the present inventors have come up with the idea of allocating uplink signals by controlling the arrangement of DMRSs (the locations, the number of DMRSs to arrange, etc.) based on the length of the UpPTS that to be extended.
  • the present inventors have come up with the idea of multiplexing and transmitting one or more DMRS and SRS upon the UpPTS.
  • TDD cells to use the UL/DL configuration 7 of FIG. 3B can be used in licensed areas or in unlicensed areas.
  • UpPTS uplink time duration
  • DMRSs Demodulation Reference Signals
  • FIG. 11 shows the number of UpPTS symbols and an arrangement/relationship of uplink demodulation reference signals (PUSCH DMRSs) that are placed in the UpPTS.
  • PUSCH DMRSs uplink demodulation reference signals
  • a user terminal changes the arrangement of DMRSs (the locations, the number of DMRSs to arrange, etc.) depending on the length of the UpPTS in a special subframe.
  • the number of UpPTS symbols is less than a predetermined value (six in FIG. 11 )
  • one DMRS one symbol
  • two DMRSs two symbols
  • the distance between the first DMRS and the second DMRS is controlled depending on the length of UpPTS.
  • the distance between the first DMRS and the second DMRS is configured greater as the number of UpPTS symbols grows. Also, when the number of UpPTS symbols is seven or more, it becomes possible to allocate uplink signals to neighboring symbols of the first DMRS and the second DMRS.
  • the number of symbols to neighbor the symbols where DMRSs are allocated increases, so that it is possible to map uplink control information (UCI), which is important information, to neighboring (for example, front and rear) symbols of the DMRSs.
  • UCI uplink control information
  • a DMRS in at least a predetermined symbol (for example, the tenth symbol) on a fixed basis.
  • a first DMRS and a second DMRS are configured, the location to allocate the first DMRS is changed depending on the length of the UpPTS, while the location to allocate the second DMRS is fixed regardless of the length of the UpPTS.
  • the second DMRS in the same symbol (for example, the tenth symbol) regardless of the length of the UpPTS, it becomes possible to prevent the second DMRS from interfering with UL data even when the length of the UpPTS is configured differently in nearby cells.
  • the length of the extended UpPTS is comparatively long (for example, the UpPTS is six or more)
  • placing PUSCH fields that neighbor the two DMRSs regardless of the length of the extended UpPTS makes it possible to map uplink control information (UCI), which is important information, in front and rear of the two DMRSs.
  • UCI uplink control information
  • the method of arranging DMRSs that are configured in an extended UpPTS is by no means limited to the structure shown in above FIG. 11 .
  • a structure may be employed in which a DMRS is allocated to the top symbol constituting the UpPTS (see FIG. 12 ).
  • the first DMRS is allocated to the top symbol constituting the UpPTS
  • the second DMRS is allocated to a predetermined symbol (for example, the tenth symbol) on a fixed basis.
  • uplink control information which is important information, to neighboring (for example, front and rear) symbols of the DMRSs.
  • UpPTS uplink time duration
  • SRS Sounding Reference Signal
  • FIG. 13 shows an example PUSCH format in which a DMRS and an SRS are placed in an extended UpPTS. Although a case will be described here in which one DMRS and one SRS (one symbol each) are configured in the UpPTS, the present embodiment is by no means limited to this.
  • a user terminal transmits an SRS in a bandwidth including at least the bandwidth allocated to the PUSCH.
  • the user terminal may transmit SRSs periodically (periodic-SRSs), or transmit SRSs aperiodically (aperiodic-SRSs) in response to commands from radio base stations.
  • a radio base station may command SRS sequences and Comb to the user terminal by using the trigger information.
  • the user terminal may multiplex and transmit an SRS in the UpPTS of every special subframe, or may multiplex and transmit SRSs at a rate of once in every several UpPTSs.
  • FIG. 13 shows a case where SRSs are multiplexed in every other OFDM symbol (in even-numbered or in odd-numbered OFDM symbols), it is equally possible to multiplex SRS across a plurality of OFDM symbols.
  • the user terminal may as well multiplex uplink control information upon neighboring symbols of the SRS.
  • the user terminal may as well multiplex uplink control information on the symbol that is one symbol before the SRS (the twelfth OFDM symbol).
  • the user terminal in the UpPTS, configure a DMRS in a predetermined symbol (for example, the tenth symbol) regardless of the number of UpPTS symbols.
  • a predetermined symbol for example, the tenth symbol
  • Timing control for operations pertaining to uplink signals to transmit using special subframes in which the length of the UpPTS is extended will be described with a third example.
  • FIG. 14 shows the timings of operations pertaining to uplink signals to transmit in UL subframes of existing UL/DL configuration 5 (for example, DL HARQ feedback, PUSCH transmission in response to a UL grant, PHICH reception (UL HARQ) in response to the PUSCH and so on).
  • the present inventors have focused on the fact that special subframes in which the length of the UpPTS is extended can be used as UL subframes.
  • FIG. 15 shows timing control for operations pertaining to uplink signals to transmit in special subframes (UL subframes) of UL/DL configuration 7 according to the present embodiment (for example, DL HARQ feedback, PUSCH transmission in response to a UL grant, PHICH reception (UL HARQ) in response to the PUSCH and so on).
  • special subframes for example, DL HARQ feedback, PUSCH transmission in response to a UL grant, PHICH reception (UL HARQ) in response to the PUSCH and so on.
  • the same mechanism as the DL/UL HARQ timing and the UL scheduling timing of existing UL/DL configuration 5 is used. Note that, in FIG. 15 , compared to existing UL/DL configuration 5 , the subframes numbers corresponding to respective operation timings are all shifted by ⁇ 1.
  • the timings of operations pertaining to uplink signals to transmit in special subframes in which the length of the UpPTS is extended are controlled by using the mechanism of existing UL/DL configuration 5 .
  • FIG. 16 is a diagram to show a schematic structure of a radio communication system according to the present embodiment.
  • the radio communication system shown in FIG. 16 is, for example, an LTE system or a system to incorporate SUPER 3G.
  • This radio communication system can adopt carrier aggregation (CA) to group a plurality of fundamental frequency blocks (component carriers) into one, where the LTE system bandwidth constitutes one unit.
  • CA carrier aggregation
  • this radio communication system may be referred to as “IMT-advanced,” or may be referred to as “4G,” “FRA (Future Radio Access),” etc.
  • the radio communication system 1 shown in FIG. 16 includes a radio base station 11 that forms a macro cell C 1 , and radio base stations 12 a and 12 b that form small cells C 2 , which are placed within the macro cell C 1 and which are narrower than the macro cell C 1 .
  • user terminals 20 are placed in the macro cell C 1 and in each small cell C 2 .
  • the user terminals 20 can connect with both the radio base station 11 and the radio base stations 12 .
  • intra-base station CA intra-eNB CA
  • inter-eNB CA inter-base station CA
  • TDD-TDD CA or TDD-FDD CA and so on can be applied.
  • a carrier of a relatively low frequency band for example, 2 GHz
  • a narrow bandwidth referred to as, for example, “existing carrier,” “legacy carrier” and so on.
  • a carrier of a relatively high frequency band for example, 3.5 GHz and so on
  • a new carrier type may be used as the carrier type between the user terminals 20 and the radio base stations 12 .
  • wire connection optical fiber, the X2 interface and so on
  • wireless connection is established.
  • the radio base station 11 and the radio base stations 12 are each connected with a higher station apparatus 30 , and are connected with a core network 40 via the higher station apparatus 30 .
  • the higher station apparatus 30 may be, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME) and so on, but is by no means limited to these.
  • RNC radio network controller
  • MME mobility management entity
  • each radio base station 12 may be connected with the higher station apparatus via the radio base station 11 .
  • the radio base station 11 is a radio base station having a relatively wide coverage, and may be referred to as an “eNodeB,” a “macro base station,” a “transmitting/receiving point” and so on.
  • the radio base stations 12 are radio base stations having local coverages, and may be referred to as “small base stations,” “pico base stations,” “femto base stations,” “home eNodeBs,” “micro base stations,” “transmitting/receiving points” and so on.
  • the radio base stations 11 and 12 will be collectively referred to as a “radio base station 10 ,” unless specified otherwise.
  • the user terminals 20 are terminals to support various communication schemes such as LTE, LTE-A and so on, and may be either mobile communication terminals or stationary communication terminals.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • OFDMA is a multi-carrier transmission scheme to perform communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
  • SC-FDMA is a single-carrier transmission scheme to mitigate interference between terminals by dividing the system band into bands formed with one or continuous resource blocks per terminal, and allowing a plurality of terminals to use mutually different bands.
  • Downlink communication channels include a PDSCH (Physical Downlink Shared CHannel), which is used by each user terminal 20 on a shared basis, and downlink L1/L2 control channels (PDCCH, PCFICH, PHICH and enhanced PDCCH).
  • PDSCH Physical Downlink Shared CHannel
  • PDCCH Physical Downlink Control CHannel
  • the number of OFDM symbols to use for the PDCCH is communicated by the PCFICH (Physical Control Format Indicator CHannel).
  • HARQ ACKs/NACKs for the PUSCH are communicated by the PHICH (Physical Hybrid-ARQ Indicator CHannel). Also, the scheduling information for the PDSCH and the PUSCH and so on may be communicated by the enhanced PDCCH (EPDCCH) as well. This EPDCCH is frequency-division-multiplexed with the PDSCH (downlink shared data channel).
  • PHICH Physical Hybrid-ARQ Indicator CHannel
  • EPDCCH enhanced PDCCH
  • Uplink communication channels include a PUSCH (Physical Uplink Shared CHannel), which is used by each user terminal 20 on a shared basis as an uplink data channel, and a PUCCH (Physical Uplink Control CHannel), which is an uplink control channel.
  • PUSCH Physical Uplink Shared CHannel
  • PUCCH Physical Uplink Control CHannel
  • User data and higher control information are communicated by this PUSCH.
  • downlink radio quality information CQI: Channel Quality Indicator
  • ACKs/NACKs and so on are communicated by the PUCCH, the PUSCH and so on (transmitted simultaneously with user data).
  • FIG. 17 is a diagram to show an overall structure of a radio base station 10 (which may be either a radio base station 11 or 12 ) according to the present embodiment.
  • the radio base station 10 has a plurality of transmitting/receiving antennas 101 for MIMO communication, amplifying sections 102 , transmitting/receiving sections 103 , a baseband signal processing section 104 , a call processing section 105 and a communication path interface 106 .
  • User data to be transmitted from the radio base station 10 to a user terminal 20 on the downlink is input from the higher station apparatus 30 to the baseband signal processing section 104 , via the communication path interface 106 .
  • a PDCP layer process division and coupling of user data, RLC (Radio Link Control) layer transmission processes such as an RLC retransmission control transmission process, MAC (Medium Access Control) retransmission control, including, for example, an HARQ transmission process, scheduling, transport format selection, channel coding, an inverse fast Fourier transform (IFFT) process and a precoding process are performed, and the result is forwarded to each transmitting/receiving section 103 .
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ transmission process scheduling, transport format selection, channel coding, an inverse fast Fourier transform (IFFT) process and a precoding process
  • IFFT inverse fast Fourier transform
  • precoding inverse fast Fourier transform
  • the baseband signal processing section 104 reports, to the user terminal 20 , control information for allowing communication in the cell, through higher layer signaling (RRC signaling, broadcast signal and so on).
  • the information for allowing communication in the cell may include, for example, information about the UL/DL configuration to use in TDD cells, information about special subframes, the uplink or downlink system bandwidth, feedback resource information, and so on.
  • the information about special subframes may include the special subframe configuration to use, a special subframe configuration change command, the details of change when change is made to special subframes (information about the extension of the UpPTS), and so on.
  • the baseband signal processing section 104 controls arrangement of uplink demodulation reference signals (DMRSs) (the locations, the number of DMRSs, etc.) depending on the configuration of special subframes (the length of the extended UpPTS), and, furthermore, controls the allocation of uplink signals (user data, uplink control information, etc.) and SRSs.
  • DMRSs uplink demodulation reference signals
  • special subframes the length of the extended UpPTS
  • Each transmitting/receiving section 103 converts the baseband signals, which are pre-coded and output from the baseband signal processing section 104 on a per antenna basis, into a radio frequency band.
  • the amplifying sections 102 amplify the radio frequency signals having been subjected to frequency conversion, and transmit the signals through the transmitting/receiving antennas 101 .
  • the transmitting/receiving sections 103 function as transmission sections that transmit information about the UL/DL configuration to use in TDD cells, information about special subframes and so on, through higher layer signaling (broadcast signals, RRC signaling and so on). Also, when the arrangement of DMRSs is controlled to change in accordance with the extension of the UpPTS, the transmitting/receiving sections 103 can report information about the arrangement of DMRSs to the user terminal by using downlink signals (downlink control information, broadcast signal, RRC signaling or combination of these).
  • downlink signals downlink control information, broadcast signal, RRC signaling or combination of these.
  • the arrangement of DMRSs is determined in advance for every length of the UpPTS (for example, when the number of UpPTS symbols and the arrangement of DMRSs are associated with each other), it is possible to skip reporting information about the arrangement of DMRSs.
  • radio frequency signals that are received in the transmitting/receiving antennas 101 are each amplified in the amplifying sections 102 , converted into the baseband signal through frequency conversion in each transmitting/receiving section 103 , and input in the baseband signal processing section 104 .
  • the user data that is included in the input baseband signal is subjected to an FFT process, an IDFT process, error correction decoding, a MAC retransmission control receiving process, and RLC layer and PDCP layer receiving processes, and the result is forwarded to the higher station apparatus 30 via the communication path interface 106 .
  • the call processing section 105 performs call processing such as setting up and releasing communication channels, manages the state of the radio base stations 10 and manages the radio resources.
  • FIG. 18 is a diagram to show a principle functional structure of the baseband signal processing section 104 provided in the radio base station 10 according to the present embodiment
  • the baseband signal processing section 104 provided in the radio base station 10 is comprised at least of a control section 301 , a DL signal generating section 302 , a UL/DL configuration determining section 303 , a special subframe configuration determining section 304 , a mapping section 305 , a UL signal decoding section 306 and a decision section 307 .
  • the control section 301 controls the scheduling of downlink user data that is transmitted in the PDSCH, downlink control information that is transmitted in the PDCCH and/or the enhanced PDCCH (EPDCCH), downlink reference signals and so on. Also, the control section 301 can control the scheduling of uplink user data that is transmitted in the PUSCH, uplink control information that is transmitted in the PUCCH or the PUSCH, and uplink reference signals (DMRS, SRS, etc.) (allocation control). Information about the allocation control of uplink signals (uplink control signals and uplink user data) is reported to user terminals by using downlink control signals (DCI).
  • DCI downlink control signals
  • control section 301 controls the allocation of radio resources to downlink signals and uplink signals based on command information from the higher station apparatus 30 , feedback information from each user terminal 20 and so on. That is, the control section 301 functions as a scheduler. Also, when the radio base station 10 uses TDD, the allocation of downlink signals and uplink signals to each subframe is controlled based on the UL/DL configuration to use and/or the special subframe configuration.
  • the control section 301 controls the uplink signals to allocate to the extended UpPTS of the special subframes.
  • the control section 301 controls the allocation of uplink signals such as PRACH signals, message 3 in random access procedures, higher layer control signals, downlink HARQ-ACK, CQI, SR, SRS and so on, by using the extended UpPTS of special subframes.
  • control section 301 can control the allocation of uplink control information by taking into account the DMRSs that are configured depending on the number of extended UpPTS symbols. For example, the control section 301 may allocate uplink control information to an OFDM symbol to neighbor a DMRS placed in an extended UpPTS. As shown in above FIG. 11 , when two DMRSs are placed in an extended UpPTS, uplink control information (UCI) can be controlled to be allocated in front and rear of the two DMRSs.
  • UCI uplink control information
  • the DL signal generating section 302 generates downlink control signals (PDCCH signals and/or EPDCCH signals) and downlink data signals (PDSCH signals) that are determined to be allocated by the control section 301 . To be more specific, based on commands from the control section 301 , the DL signal generating section 302 generates DL assignments, which report downlink signal allocation information, and UL grants, which report uplink signal allocation information.
  • PDCCH signals and/or EPDCCH signals downlink control signals
  • PDSCH signals downlink data signals
  • the DL signal generating section 302 generates information about the UL/DL configuration determined in the UL/DL configuration determining section 303 , information about the special subframe configuration determined in the special subframe configuration determining section 304 .
  • the DL signal generating section 302 commands the user terminal to make a change to special subframes (see above FIG. 8 )
  • the DL signal generating section generates a special subframe change request signal as a UL grant.
  • the UL/DL configuration determining section 303 determines the UL/DL configuration to use in TDD taking into account UL and DL traffic and so on.
  • the UL/DL configuration determining section 303 can select a predetermined UL/DL configuration from a plurality of UL/DL configurations including UL/DL configurations for DL communication (such as above-described UL/DL configuration 7 ) (see FIG. 3B and so on). Note that the UL/DL configuration determining section 303 can determine the UL/DL configuration based on information from the higher station apparatus 30 and so on.
  • the special subframe configuration determining section 304 determines the special subframe configuration. Note that the special subframe configuration determining section 304 can determine the UL/DL configuration based on information from the higher station apparatus 30 and so on. The special subframe configuration determining section 304 can determine a predetermined special subframe configuration from a table, in which a special subframe configuration 10 to use an extended UpPTS is newly provided, in addition to existing special subframe configurations 0 to 9 (see above FIG. 7 ).
  • the special subframe configuration determining section 304 extends the length of the UpPTS to three symbols or more, and, furthermore, lowers the number of GP symbols by the number of UpPTS symbols extended (see FIG. 8A ).
  • the special subframe configuration determining section 304 may as well extend the length of the UpPTS to three symbols or more, and, furthermore, lowers the number of DwPTS symbols by the number of UpPTS symbols extended (see FIG. 8B ).
  • the mapping section 305 controls the allocation of the downlink control signals and the downlink data signals generate in the DL signal generating section 302 to radio resources based on commands from the control section 301 .
  • the UL signal decoding section 306 decodes the feedback signals (delivery acknowledgement signals and so on) transmitted from the user terminal, and outputs the results to the control section 301 . Also, the UL signal decoding section 306 decodes the uplink data signals transmitted from the user terminal through an uplink shared channel (PUSCH), and outputs the results to the decision section 307 . The decision section 307 makes retransmission control decisions (ACKs/NACKs) based on the decoding results in the UL signal decoding section 306 , and, furthermore, outputs the results to the control section 301 .
  • ACKs/NACKs retransmission control decisions
  • FIG. 19 is a diagram to show an overall structure of a user terminal 20 according to the present embodiment.
  • the user terminal 20 has a plurality of transmitting/receiving antennas 201 for MIMO communication, amplifying sections 202 , transmitting/receiving sections (receiving sections) 203 , a baseband signal processing section 204 and an application section 205 .
  • radio frequency signals that are received in the plurality of transmitting/receiving antennas 201 are each amplified in the amplifying sections 202 , and subjected to frequency conversion and converted into the baseband signal in the transmitting/receiving sections 203 .
  • This baseband signal is subjected to receiving processes such as an FFT process, error correction decoding and retransmission control, in the baseband signal processing section 204 .
  • downlink user data is forwarded to the application section 205 .
  • the application section 205 performs processes related to higher layers above the physical layer and the MAC layer. Also, in the downlink data, broadcast information is also forwarded to the application section 205 .
  • the transmitting/receiving sections 203 function as receiving sections to receive information about the UL/DL configuration, information about special subframes, and so on.
  • the information about special subframes may include the special subframe configuration to employ, a special subframe configuration change command, the details of change when change is made to special subframes (information about the extension of the UpPTS) and so on.
  • uplink user data is input from the application section 205 to the baseband signal processing section 204 .
  • a retransmission control (H-ARQ (Hybrid ARQ)) transmission process is performed, and the result is forwarded to each transmitting/receiving section 203 .
  • the baseband signal that is output from the baseband signal processing section 204 is converted into a radio frequency band in the transmitting/receiving sections 203 .
  • the amplifying sections 202 amplify the radio frequency signals having been subjected to frequency conversion, and transmit the resulting signals from the transmitting/receiving antennas 201 .
  • FIG. 20 is a diagram to show a principle functional structure of the baseband signal processing section 204 provided in the user terminal 20 .
  • the baseband signal processing section 204 provided in the user terminal 20 is comprised at least of a DL signal decoding section 401 , a UL/DL configuration identifying section 402 , a special subframe configuration identifying section 403 , a decision section 404 , a control section 405 , a UL signal generating section 406 , a mapping section 407 and a UL reference signal generating section 408 .
  • the DL signal decoding section 401 decodes the downlink control signals (PDCCH signals) transmitted in the downlink control channel (PDCCH), and outputs scheduling information (information regarding the allocation to uplink resources) to the control section 405 . Also, the DL signal decoding section 401 decodes the downlink data signals transmitted in the downlink shared channel (PDSCH), and outputs the results to the decision section 404 .
  • the decision section 404 makes retransmission control decisions (ACKs/NACKs) based on the decoding results in the DL signal decoding section 401 , and, furthermore, outputs the results to the control section 405 .
  • the DL signal decoding section 401 If information about the UL/DL configuration or information about special subframes is included in a downlink signal that is received, the DL signal decoding section 401 outputs the decoded information to the UL/DL configuration identifying section 402 and the special subframe configuration identifying section 403 .
  • the UL/DL configuration identifying section 402 identifies the UL/DL configuration which the user terminal employs, based on the information about the UL/DL configuration reported from the radio base station. Also, the UL/DL configuration identifying section 402 outputs the information about the UL/DL configuration to employ, to the control section 405 and/or others.
  • the special subframe configuration identifying section 403 identifies the special subframe configuration the user terminal employs, based on the information about the special subframe configuration reported from the radio base station. Also, the special subframe configuration identifying section 403 outputs the information about the UL/DL configuration to employ, to the control section 405 and/or others. Note that information about the DMRS placed in the UpPTS may be included in the information about the special subframe configuration.
  • the special subframe configuration identifying section 403 can specify the special subframe configuration based on broadcast information or based on information that is reported through RRC signaling and/or the like. For example, when the special subframe configuration identifying section 403 decides to employ special subframe configuration 10 of above FIG. 7 , the subframe configuration identifying section 403 sends an output to that effect to the control section 405 .
  • the special subframe configuration identifying section 403 identifies the special subframe configuration to employ based on information contained in a downlink signal (for example, a UL grant) and outputs the result to the control section 405 .
  • the control section 405 controls the generation of uplink control signals (feedback signals), uplink data signals and uplink reference signals based on downlink control signals (PDCCH signals) transmitted from radio base stations, retransmission control decisions in response to PDSCH signals received and so on.
  • the downlink control signals are output from the DL signal decoding section 401 , and the retransmission control decisions are output from the decision section 404 .
  • control section 405 controls the transmission of the uplink control signals, uplink data signals and uplink reference signals based on the information about the UL/DL configuration output from the UL/DL configuration identifying section 402 , the information about special subframes output from the special subframe configuration identifying section 403 and so on.
  • control section 405 extends the UpPTS to constitute special subframes longer than an existing UpPTS based on the information about special subframes, and controls the allocation of uplink signals.
  • the control section 405 can control the arrangement of uplink DMRSs (the locations, the number of DMRSs to arrange, etc.) based on the length of the UpPTS. For example, when the number of UpPTS symbols is equal to or greater than a predetermined value, the control section 405 configures two uplink DMRSs (two symbols). As shown in FIG. 11 , the control section 405 configures two DMRSs when the number of UpPTS symbols is six or more, and configures one DMRS when the number of UpPTS symbols is five or less. Also, as shown in above FIG. 12 , the control section 405 configures two DMRSs when the number of UpPTS symbols is five or more, and configures one DMRS when the number of UpPTS symbols is four or less.
  • control section 405 can arrange two DMRSs a greater distance apart when the number of UpPTS symbols increases. Also, the control section 405 can change the location to allocate the first DMRS depending on the length of the UpPTS, and configure the location to allocate the second DMRS (for example, the tenth OFDM symbol) on a fixed basis regardless of the length of the UpPTS.
  • the control section 405 also functions as a feedback control section to control the feedback of channel state information (CSI), delivery acknowledgement signals (A/N's) and so on.
  • the control section 405 can control the allocation of uplink control information (CSI such as CQI, PMI, RI and so on, A/N's, etc.) taking into account the DMRS to be configured based on the number of extended UpPTS symbols.
  • CSI channel state information
  • A/N's delivery acknowledgement signals
  • the control section 405 can control the allocation of uplink control information (CSI such as CQI, PMI, RI and so on, A/N's, etc.) taking into account the DMRS to be configured based on the number of extended UpPTS symbols.
  • the control section 405 executes control so that uplink control information in allocated to an OFDM symbol that neighbors a DMRS that is placed in an extended UpPTS.
  • control section 405 can control the allocation of DMRSs and channel quality measurement reference signals (SRSs) to an extended UpPTS (see above FIG. 13 ).
  • SRSs channel quality measurement reference signals
  • the UL signal generating section 406 generates uplink control signals (feedback signals such as delivery acknowledgement signals, channel state information (CSI) and so on) based on commands from the control section 405 . Also, the UL signal generating section 406 generates uplink data signals (user data) based on commands from the control section 405 . Also, the UL reference signal generating section 408 controls the generation of reference signals (DMRSs, SRSs, etc.) to transmit on the uplink.
  • uplink control signals feedback signals such as delivery acknowledgement signals, channel state information (CSI) and so on
  • uplink data signals user data
  • the UL reference signal generating section 408 controls the generation of reference signals (DMRSs, SRSs, etc.) to transmit on the uplink.
  • the mapping section 407 controls the allocation of uplink control signals, uplink data signals and uplink reference signals to radio resources based on commands from the control section 405 .
  • the mapping section 407 maps the uplink control signals, uplink data signals and uplink reference signals to an extended UpPTS based on commands from the control section 405 .

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