WO2016002855A1 - 基地局装置および端末装置 - Google Patents
基地局装置および端末装置 Download PDFInfo
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- WO2016002855A1 WO2016002855A1 PCT/JP2015/069051 JP2015069051W WO2016002855A1 WO 2016002855 A1 WO2016002855 A1 WO 2016002855A1 JP 2015069051 W JP2015069051 W JP 2015069051W WO 2016002855 A1 WO2016002855 A1 WO 2016002855A1
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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
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
Definitions
- the present invention relates to a base station device and a terminal device.
- LTE Long Term Evolution
- IMT-A Long Term Evolution-Advanced
- LTE-A Long Term Evolution-Advanced, IMT-A, etc.
- LTE systems and LTE-A systems In LTE systems and LTE-A systems, it is necessary to cope with the rapid increase in data traffic. In addition to introducing technologies to improve peak data rates and frequency utilization efficiency, securing frequency resources is one of the important issues. is there. Until now, LTE systems and LTE-A systems have been premised on the use of frequency bands called licensed bands that have been approved for use by countries and regions where wireless operators provide services. The frequency band is limited.
- LTE-U LTE-U
- LTE-U LTE-U
- CA Carrier-Aggregation
- CC component carrier
- Serving-cell a component carrier
- This CA technology is also applied to an unlicensed band, and utilization of the unlicensed band is expected as one of the methods that can cope with a rapid increase in data traffic.
- a frequency band called a white band that is not actually used for the purpose of preventing interference between frequencies (for example, a region allocated for television broadcasting, Frequency bands that are not used by certain operators) or shared frequency bands that have been allocated exclusively to specific operators but are expected to be shared by multiple operators in the future. It may be used in the future.
- the LTE-A system As represented by the IEEE 802.11 system, it is also used for communication by RAT (Radio Access Technology) different from LTE, so the LTE-A system and other systems need to coexist. is there.
- RAT Radio Access Technology
- the conventional LTE-A system is premised on the use of a license band, the design is not designed in consideration that the frequency band to be used may be occupied by another system. Therefore, in the LTE-A system, there is a problem that stable communication cannot be performed when there is time for another system to occupy the unlicensed band being used.
- the LTE-A system uses a frequency band other than the license band such as the white band (white space), there is a possibility that the system may be interfered with by other systems, as in the case of using the unlicensed band. There are similar issues.
- the present invention has been made in view of the above points.
- an LTE-A system uses an unlicensed band or a white band in common with another system
- the LTE-A system uses the unlicensed band.
- An object is to provide a data transmission method that realizes stable communication even when another system occupies an unlicensed band.
- the present invention has been made to solve the above-described problems, and one aspect of the present invention communicates with a terminal device in a second frequency band different from the first frequency band that can be used exclusively.
- a wireless transmission unit that transmits data and control information to the terminal device, and a wireless reception unit that receives data and control information transmitted from the terminal device, the wireless transmission Unit transmits data to the terminal device, and when another system is communicating in the second frequency band at the reception timing of ACK / NACK for the data transmission, the wireless reception unit In the first uplink subframe after communication is completed, reception processing of ACK / NACK transmitted from the terminal apparatus is performed.
- the wireless transmission unit transmits resource allocation control information for data transmission of the terminal device, and the other system is configured to transmit the data allocation timing for the resource allocation.
- the wireless reception unit performs reception processing of data transmitted from the terminal device in the first uplink subframe after the communication of the other system is completed.
- one aspect of the present invention is a base station apparatus that communicates with a terminal apparatus in a second frequency band different from the first frequency band that can be used exclusively and the first frequency band, A wireless transmission unit that transmits data and control information to the terminal device and a wireless reception unit that receives data and control information transmitted from the terminal device, wherein the wireless transmission unit transmits data to the terminal device;
- the radio reception unit transmits an ACK transmitted from the terminal apparatus in the first frequency band. / NACK reception processing is performed.
- the wireless reception unit receives data transmitted from the terminal device, and another system transmits the second frequency at an ACK / NACK transmission timing for the data transmission.
- ACK / NACK is transmitted to the terminal device in the first frequency band.
- a data amount management unit that manages a downlink buffered data amount, and when there is no downlink buffered data amount, the wireless transmission unit Notifies NAV by RTS or CTS-to-Self, or transmits dummy data.
- one aspect of the present invention is a terminal device that communicates with a base station apparatus in a second frequency band different from the first frequency band that can be used exclusively, and is transmitted from the base station apparatus.
- An effective subframe determination unit that detects a synchronization signal to be received, a reception signal detection unit that performs reception processing of a data signal transmitted from the base station device, and a wireless transmission unit that transmits a signal to the base station device.
- the wireless transmission unit transmits ACK / NACK indicating whether the data signal transmitted from the base station apparatus has been correctly received by the reception signal detection unit, the wireless transmission unit performs four sub-steps from the reception timing of the data signal.
- the effective subframe determination unit receives an uplink subframe after the frame and a notification that another system than the base station apparatus is not communicating in the second frequency band. Transmitting the ACK / NACK was later.
- one aspect of the present invention includes a control signal detection unit that detects control information including resource allocation used for data transmission to the base station apparatus, and the control signal detection unit includes the base station When detecting control information including resource allocation used for data transmission transmitted from a device, the radio transmission unit is an uplink subframe four subframes after the timing of receiving the resource allocation, and the base station device Data is transmitted to the base station apparatus after receiving notification that another system is not communicating in the second frequency band.
- a radio reception unit that performs carrier sense for determining whether another system is performing communication in the second frequency band, and the radio reception unit includes a downlink.
- the carrier sense is performed in the subframe that switches from uplink to uplink.
- ACK / NACK for the data to be transmitted to the base station apparatus or downlink data is transmitted.
- This is a subframe that switches from the downlink before the subframe to be uplinked to the uplink.
- the radio reception unit performs carrier sense only in a frequency band in which ACK / NACK for data to be transmitted to the base station apparatus or downlink data is transmitted.
- the effective subframe determination unit cannot detect the synchronization signal transmitted from the base station apparatus, or as a result of carrier sense of the radio reception unit, When another system is communicating in a frequency band, the radio reception unit uses the first frequency band for transmitting ACK / NACK for data to be transmitted to the base station apparatus or downlink data.
- the present invention it is possible to efficiently share information on whether the base station apparatus and the terminal apparatus can use the unlicensed band or cannot be used because other systems occupy the system.
- FIG. 4 is a diagram illustrating an example of uplink ACK / NACK transmission according to the present invention.
- FIG. 4 is a diagram illustrating an example of uplink ACK / NACK transmission according to the present invention.
- FIG. 4 is a diagram illustrating an example of uplink ACK / NACK transmission according to the present invention.
- FIG. 1 shows an example of the configuration of a system according to the present invention.
- the system includes a macro base station apparatus 10, an ULB base station apparatus 11, and terminal apparatuses 21 and 22.
- the number of terminal devices terminal, mobile terminals, mobile stations, UE: User Equipment
- the macro base station apparatus 10 performs communication using a so-called licensed band, which is licensed from the country or area where the wireless service provider provides the service, and the ULB base station apparatus 11 receives information from the country or area.
- the macro base station apparatus 10 may support not only a license band but also an unlicensed band communication, and a pico base station apparatus (Pico eNB: evolved Node B, SmallCell, Low Power Node, also called Remote Radio Head) may support unlicensed band communication.
- the unlicensed band may be only a downlink (downlink or downlink) that is communication from the ULB base station apparatus 11 to the terminal apparatus 21, or not only from the downlink but also from the terminal apparatus 21 to the ULB base station apparatus 11.
- Uplink (uplink or uplink) that is communication of the above may also be supported.
- an unlicensed band is described as an example of a frequency band other than the license band, but the present invention is not limited to this.
- the terminal device 21 can communicate with at least one of the macro base station device 10 and the ULB base station device 11.
- the terminal device 22 is connected only to the macro base station device 10.
- the terminal device 21 can communicate with either one of the license band component carrier (also referred to as CC: “Component” Carrier or Serving “cell”) and / or the CC of the unlicensed band.
- CC the license band component carrier
- ULB-CC the CC of the unlicensed band
- the terminal device 21 uses the license band.
- LB-CC CC of CC
- ULB base station apparatus 11 and terminal apparatus 21 When performing communication using ULB-CC, at least one of ULB base station apparatus 11 and terminal apparatus 21 confirms whether ULB-CC is being used by another system, such as carrier sense (for example, listenlistbefore talk). Method). For example, the ULB base station device 11 or the terminal device 21 can start communication based on an access method called CSMA / CA (Carrier Sense Multiple Multiple Access with Collision Avoidance). As a specific example of carrier sense, whether or not another system is using is determined based on whether or not a reception level of a carrier frequency (for example, RSSI: “Received” Signal “Strength” Indicator) exceeds a threshold value.
- the ULB-CC is described as being applied with TDD (also referred to as Time Division Division Duplex or frame structure type 2), but may also support FDD (also referred to as Frequency Division Duplex or frame structure type 1). good.
- FIG. 2 shows the TDD frame structure of the LTE system. From the figure, in the TDD of the LTE system, a plurality of uplink-downlink configurations are prepared, and are set appropriately in units of CCs.
- D is a downlink subframe
- U is an uplink subframe
- S is a special subframe
- the special subframe is a GP (Guard Period) and a downlink pilot time slot (DwPTS) required for switching from the downlink to the uplink. ), And consists of an uplink pilot time slot (UpPTS).
- Periods for switching from the downlink to the uplink include 5 msec (configuration # 0, 1, 2, 6) and 10 msec (configuration # 3, 4, 5).
- the D, U, and S patterns used in this cycle are repeated. Since the LTE system and the LTE-A system can occupy and use the license band, communication is always performed in any pattern.
- FIG. 3 shows an example of a frame configuration according to the present invention.
- carrier sense (CS: Carrier Sense) is required before communication starts, so subframe # 0 and subframe # in C in the figure 5 is a period for carrier sense.
- subframes # 0 and # 5 at least the ULB base station apparatus 11 performs carrier sense, and when other systems are not using ULB-CC, downlink transmission is started from subframe # 1.
- ULB base station apparatus 11 performs carrier sense in subframes # 0 and # 5 and another system uses ULB-CC, it can be confirmed that the other system is not used in the carrier sense subframe. No transmission is performed.
- ULB base station apparatus 11 sets subframes # 1 to # 4 as invalid subframes. I reckon. That is, communication using ULB-CC between the ULB base station apparatus 11 and the terminal apparatus is not performed in subframes # 1 to # 4.
- ULB base station apparatus 11 regards subframes # 1 to # 4 as effective subframes. That is, communication using ULB-CC between the ULB base station apparatus 11 and the terminal apparatus is performed in subframes # 1 to # 4.
- FIG. 4 shows an example of the configuration of the base station apparatus according to the present invention. However, the minimum blocks necessary for the present invention are shown.
- the figure shows an example of the configuration of the ULB base station apparatus 11, but a base station apparatus (for example, the macro base station apparatus 10) that performs communication only in the LB-CC of the license band has the same configuration except that the CS determination unit 106 is not provided. It is.
- the ULB base station apparatus 11 receives the control information transmitted from the terminal apparatus via PUCCH (Physical Uplink Control CHannel) or the control information transmitted via PUSCH (Physical Uplink Shared CHannel) by the reception antenna 104. In the carrier sense subframe, reception processing is performed to confirm whether another system is using the ULB-CC.
- PUCCH Physical Uplink Control CHannel
- PUSCH Physical Uplink Shared CHannel
- the radio reception unit 105 down-converts the received signal to a baseband frequency, performs A / D (Analog / Digital) conversion, and removes CP (Cyclic Prefix) from the digital signal.
- the signal is input to the UL signal demodulator 107. Thereafter, the UL signal demodulating unit 107 determines channel quality information (CSI: Channel State), SR (Scheduling Request), ACK / NACK (Acknowledgement / Negative Acknowledgement), RACH (Random Access CHannel) from the control information after CP removal.
- CSI Channel State
- SR Service
- ACK / NACK Acknowledgement / Negative Acknowledgement
- RACH Random Access CHannel
- the radio reception unit 105 inputs a received signal to the CS determination unit 106.
- the CS determination unit 106 determines whether another system is using the ULB-CC, and sets the subcarrier frame up to the next carrier sense as an effective subframe or an invalid subframe. To determine whether to perform communication by ULB-CC.
- carrier sense even if no other system is using the ULB-CC, it may be an invalid subframe when there is no downlink transmission data.
- the CS determination unit 106 inputs information on the availability of ULB-CC to the DL signal generation unit 101.
- FIG. 5 shows an example of the configuration of the DL signal generation unit 101 according to the present invention.
- the DL signal generation unit 101 outputs the ULB-CC availability information input from the CS determination unit 106 to the S / P unit 1011, the synchronization signal generation unit 1016, the control signal generation unit 1017, and the reference signal generation unit 1018.
- DL signal generation section 101 outputs uplink control information input from UL signal demodulation section 107 to S / P section 1011 and control signal generation section 1017.
- the S / P unit 1011, the synchronization signal generation unit 1016, the control signal generation unit 1017, and the reference signal generation unit 1018 do not process anything when ULB-CC cannot be used (when it is determined as an invalid subframe).
- the S / P unit 1011 receives ACK / NACK of the previous transmission opportunity from the UL signal demodulator 107, and when an ACK is input, divides a new data bit string into the number of transmission streams. When the NACK is input, the S / P unit 1011 divides the data bit string transmitted at the previous transmission opportunity into the number of transmission streams. In the present embodiment, the case where the number of streams is two will be described. However, the number of streams may be any number or one.
- the data signal generation units 1012-1 and 1012-2 generate a data transmission signal sequence from the data bit sequence.
- the processing of the data signal generators 1012-1 and 1012-2 includes error correction coding, puncturing and modulation based on MCS (Modulation and Coding scheme), and signal generation for each antenna port by multiplying the precoding matrix.
- the resource is an RB (Resource Block) composed of 12 subcarriers and 1 subframe or an RBG (Resource Block Group) obtained by grouping a plurality of RBs.
- RBG Resource Block Group
- the number of subcarriers constituting a resource block is not limited to the above example, and one resource block may be one subcarrier and allocation may be performed in units of subcarriers.
- the resource allocation information may indicate allocation of the entire subcarriers included in one ULB-CC, and may be information on which ULB-CC is used when there are a plurality of ULB-CCs. good.
- the resource allocation information may be information indicating allocation subcarriers from all subcarriers of a plurality of ULB-CCs.
- the synchronization signal generation unit 1016 generates PSS / SSS (Primary Synchronization Signal / Secondary Synchronization Signal) and inputs it to the synchronization signal multiplexing units 1013-1 and 1013-2. Synchronization signal multiplexing sections 1013-1 and 1013-2 multiplex the data transmission signal sequence and PSS / SSS.
- PSS / SSS multiplexing method in this embodiment will be described later.
- PDCCH Physical Downlink Control CHannel
- EPDCCH Enhanced PDCCH
- a downlink reference signal generated by the reference signal generation unit 1018 for example, CRS (Cell-Specific Reference Signal), CSI-RS (Channel State Information Reference Signal), DMRS (De-Modulation Reference Signal) is a reference signal multiplexing unit. 1015-1 and 1015-2, and multiplexed with the outputs of the control signal multiplexers 1014-1 and 1014-2, respectively.
- IFFT sections 1019-1 to 1019-2 convert the signal sequence from the frequency domain signal sequence to the time domain signal sequence by performing IFFT (Inverse Fast Fourier Transform).
- Radio transmission sections 102-1 to 102-2 insert a CP into the time domain signal sequence, convert it to an analog signal by D / A (Digital / Analog) conversion, and transmit the converted signal for transmission Upconvert to the radio frequency to be used.
- Radio transmitting sections 102-1 to 102-2 amplify the up-converted signal with PA (Power-Amplifier), and transmit the amplified signal via transmitting antennas 103-1 to 103-2.
- PA Power-Amplifier
- an OFDM Orthogonal Frequency Division Multiplexing
- FIG. 6 shows an example of the configuration of the terminal device according to the present invention.
- Radio receiving sections 202-1 to 202-2 downconvert the received signal to a baseband frequency, and perform A / D conversion on the downconverted signal to generate a digital signal. Further, radio reception sections 202-1 to 202-2 input a signal obtained by removing CP from the digital signal to effective subframe determination section 210.
- the effective subframe determination unit 210 detects PSS / SSS at a signal reception timing including PSS / SSS described later.
- the ULB base station apparatus 11 determines that the ULB-CC is used by another system or there is no data signal to be transmitted, and the terminal apparatus performs until the next carrier sense subframe. Treat as invalid subframe.
- the terminal apparatus does not perform downlink data or control signal reception processing in the invalid subframe. For example, if detection of PSS / SSS included in SFN # 0 to # 4 fails in the frame configuration example of FIG. 3, ULB-CC SFN # 0 to # 4 are not used.
- the failure of PSS / SSS detection is when the received power falls below a preset threshold or when the correlation value falls below the threshold.
- the terminal apparatus determines that ULB-CC is used, and the terminal apparatus treats it as an effective subframe until the next carrier sense subframe.
- the terminal apparatus performs downlink reception processing and uplink transmission processing in the effective subframe. For example, when the PSS / SSS included in the SFNs # 0 to # 4 is successfully detected in the frame configuration example of FIG. 3, the ULB-CC SFNs # 0 to # 4 are used.
- the valid subframe determination unit 210 inputs the received signal to the FFT units 203-1 to 203-2, and receives the PSS / SSS. If the SSS detection fails, the received signal is discarded.
- the FFT units 203-1 to 203-2 convert the input received signal sequence from a time domain signal sequence to a frequency domain signal sequence by fast Fourier transform, and the frequency domain signal sequence is converted to control signal demultiplexing units 205-1 to 205-. Enter in 2.
- Control signal demultiplexing sections 205-1 to 205-2 demultiplex signals transmitted on PDCCH and EPDCCH in the downlink subframes of the effective subframes, and input them to control signal detection section 209.
- the control signal separation units 205-1 to 205-2 also separate the RRC (Radio Resource Control) signal when it is received and input it to the control signal detection unit 209.
- the control signal detection unit 209 detects the DCI (Downlink Control Information) format addressed to the own station transmitted by PDCCH or EPDCCH by blind decoding. Further, the control signal detection unit 209 detects an RRC signal.
- the control signal detection unit 209 inputs the detected control information to the reception signal detection unit 207.
- the reference signal separators 206-1 to 206-2 separate the input signal into a reference signal and a data signal, and input them to the propagation path estimator 208 and the received signal detector 207, respectively.
- the propagation path estimation unit 208 estimates the frequency response of the demodulation propagation path (channel) using the input reference signals CRS, CSI-RS, and DMRS, and detects the estimated frequency response for demodulation as a received signal. Input to the unit 207.
- the propagation path estimation unit 208 notifies (reports) the propagation path quality information (CSI) estimated from CRS or CSI-RS to the base station apparatus periodically or non-periodically, although not shown.
- the information is input to the control information generation unit 215.
- the reception signal detection unit 207 detects a downlink data signal.
- the received signal detection unit 207 uses the equalization processing based on the frequency response of the propagation path, the demodulation processing based on the modulation scheme notified in the DCI format, and the bits obtained by demodulation based on the error correction coding information notified in the DCI format.
- a sequence LLR (Log Likelihood Ratio) error correction decoding process is performed.
- Received signal detection section 207 makes a hard decision on the decoded LLR sequence, and outputs a bit sequence if there is no error in cyclic redundancy check (CRC: CCyclic Redundancy Check).
- CRC CCyclic Redundancy Check
- the valid subframe determination unit 210 stores the PSS / SSS detection result and the frame configuration used in the ULB-CC notified in advance. It is assumed that the frame configuration is notified by an upper layer control signal, such as RRC signaling. However, it may be notified by a physical layer control signal.
- An example of a frame configuration used in ULB-CC is the example described in FIG. In the example shown in the figure, the configurations # 0 to # 3 have a 5-subframe period for subframes for carrier sensing, and the configurations # 4 to # 9 have a 10-subframe period for subframes for carrier sense.
- the configuration example of the frame used in the ULB-CC is not limited to that in FIG. 7, and may include a subframe for carrier sensing and a downlink subframe. For example, the ratio between the downlink and uplink subframes and the period of the subframe for carrier sensing may be configured not shown in FIG.
- the valid subframe determining unit 210 transmits the notified uplink subframe timing information (uplink valid subframe information) as a UL signal.
- the data is input to the generation unit 211 and the UL control information generation unit 215.
- the valid subframe determination unit 210 uses the notified downlink subframe timing information (information of the downlink valid subframe).
- the signals are input to the control signal separators 205-1 and 205-2.
- the valid subframe determination unit 210 performs no processing when the information of the detection result of PSS / SSS indicates a detection failure (determined as an invalid subframe).
- the UL signal generation unit 211 converts an uplink data signal into a DFTS-OFDM (also referred to as Discrete Fourier Transform Spread ⁇ OFDM or SC-FDMA) signal.
- DFTS-OFDM also referred to as Discrete Fourier Transform Spread ⁇ OFDM or SC-FDMA
- the processing applied in the UL signal generation unit 211 includes error correction coding, modulation, DFT, frequency resource allocation, IFFT, and the like.
- the UL control information generation unit 215 receives ACK / NACK information from the received signal detection unit 207, and further receives CSI information from the propagation path estimation unit 208 (not shown).
- the UL control information generation unit 215 converts ACK / NACK and periodic CSI into a UCI (Uplink Control Information) format transmitted on the PUCCH, and inputs it to the UL control information multiplexing unit 212.
- the UL control information multiplexing unit 212 multiplexes uplink data and control information. However, in the case where PUSCH and PUCCH are not transmitted simultaneously, a transmission frame is composed of only one of the signals.
- UL control information generation section 215 generates and transmits an SR or RACH signal when making an uplink resource allocation request.
- SR is transmitted by PUCCH, and the RACH signal uses a predetermined resource.
- the uplink signal is transmitted via the wireless transmission unit 213 and the transmission antenna 214.
- an uplink control signal is transmitted by ULB-CC.
- UL control information is transmitted for a signal transmitted to ULB-CC.
- the generation unit 215 does nothing.
- the case of transmitting an uplink data signal using ULB-CC has been described.
- a configuration in which no uplink subframe exists in TDD is used (or set), or ULB-CC is FDD.
- the UL signal generation unit 211, the UL control information multiplexing unit 212, the UL control information generation unit 215, the radio transmission unit 213, and the transmission antenna 214 are used only when transmitting to the LB-CC. To do.
- each subframe is composed of a plurality of OFDM symbols, and 14 OFDM symbols constitute one subframe in the LTE system.
- 14 OFDM symbols constitute one subframe in the LTE system.
- the number of OFDM symbols in one subframe is not limited in the present invention, an example of 14 OFDM symbols (symbols # 0 to # 13) will be described.
- the number of subframes in one frame is not limited, but an example of 10 subframes (subframes # 0 to # 9) will be described.
- PSS is the third OFDM symbol (symbol # 2) of subframes # 1 and # 6
- SSS is the seventh OFDM symbol (symbol # 6) of subframes # 0 and # 5.
- PSS is the last OFDM symbol (symbol # 13) of subframes # 0 and # 5
- SSS is the sixth OFDM symbol (symbol # 5) of subframes # 0 and # 5. Be placed.
- the terminal apparatus when applying a frame configuration including a carrier sense subframe before data transmission as shown in FIG. 3 by TDD in ULB-CC, the terminal apparatus identifies a subframe in which data can be transmitted and received at an earlier timing.
- the PSS of the conventional LTE system is arranged in the first subframe of the downlink of FIG. 3, but is not arranged in the first OFDM symbol because of the third OFDM symbol.
- the SSS of the conventional LTE system is arranged in the seventh OFDM symbol of the carrier sense subframe of FIG. Therefore, effective subframes cannot be efficiently identified between the ULB base station apparatus and the terminal apparatus.
- FIG. 8 shows an example of a synchronization signal multiplexing method according to the present invention.
- 7 OFDM symbols are 1 slot and 2 slots are 1 subframe (14 OFDM symbols).
- FIG. 8 is an example in which PSS / SSS is arranged in the first OFDM symbol of subframe #N SS in ULB-CC.
- #N SS indicates the first downlink subframe after carrier sense.
- PSS and SSS have shown the example arrange
- the synchronization signal multiplexing sections 1013-1 and 1013-2 of the ULB base station apparatus set PSS as RB # X PSS to RB # X PSS + L PSS (the number of resource blocks is L PSS +1), and SSS as RB # X SSS to RB. #X SSS + L SSS (the number of resource blocks is L SSS +1).
- PSS the number of resource blocks is L PSS + L PSS
- SSS the number of resource blocks is L SSS +1.
- PDCCH is arranged in the first OFDM symbol, but PDCCH is not arranged in the resource block in which PSS and SSS are arranged.
- EPDCCH is used in the ULB-CC, and control signals such as PDCCH and EPDCCH may be transmitted only in the LB-CC capable of stable communication without being affected by the communication of other systems.
- the frequency band used for communication is LB-CC or ULB-
- the arrangement of PSS and SSS may be changed depending on the CC.
- the number of resource blocks in which PSS and SSS are arranged may be all resource blocks (all subcarriers) that can be used for transmission, and signals for all resource blocks may be generated and arranged using a Zadoff-Chu sequence or the like. good.
- a signal to be arranged in the kth subcarrier may be generated by exp ( ⁇ j ⁇ uk (k + 1) / N).
- N may be generated as a maximum prime number equal to or less than the number of subcarriers in which signals are arranged, and u may be generated as a value determined based on a cell ID or the like.
- PSS and SSS may be arrange
- the terminal apparatus determines the PSS / SSS included in the first OFDM symbol of the first downlink subframe after the carrier sense subframe by the effective subframe determination unit 210. To detect. Therefore, if PSS / SSS is not detected in the first OFDM symbol, it is determined that control information and reference signals are not transmitted from the ULB base station apparatus, and RRM (Radio Resource Management Management using blind decoding or downlink reference signals is used. ) No need to perform measurements. Therefore, when PSS / SSS is not included in the first OFDM symbol of the first downlink subframe after the carrier sense subframe, it is determined whether the OFDM symbol including PSS / SSS is an effective subframe. Because it is not possible, reception processing is required. On the other hand, in this embodiment, when it is not an effective subframe, unnecessary reception processing can be omitted, and the power consumption of the terminal device can be reduced.
- one subframe has been described as 1 msec, but the present invention is not limited to this example and may be different.
- the carrier sense subframe cycle has been described as an example of a 5 subframe cycle and a 10 subframe cycle.
- the present invention is not limited to this cycle, and the carrier sense subframe cycle is determined within a predetermined cycle.
- the pattern of downlink and uplink subframes may be repeated.
- both the PSS and the SSS are arranged in the first OFDM symbol of the first downlink subframe after the carrier sense subframe, but only one of the PSS and the SSS is placed in the carrier sense subframe. It may be arranged in the first OFDM symbol of the first downlink subframe after the frame.
- PSS and SSS are arranged only in one OFDM symbol in one subframe, but they may be arranged in two or more OFDM symbols in one subframe, for example, symbol # 0 and symbol It may be arranged in # 7 or symbol # 0 and symbol # 13. Further, when PSS and SSS are arranged in a plurality of OFDM symbols, the arranged resource blocks may be changed for each OFDM symbol.
- transmission is started in a downlink subframe after a carrier sense subframe. Send) -to-self may be transmitted.
- NAV Network Allocation Vector
- the ULB base station apparatus may transmit RTS and CTS-to-self transmission in a part of the carrier sense subframe.
- the frame configuration example is shown in FIG. 7 as an example of TDD, but it is not necessary to be a downlink subframe immediately after the carrier sense subframe as in the frame configuration example of FIG. It is also good.
- the configuration of the subframes may be C, U, U, U, D, C, U, U, D, D, C, U, D, D, D.
- the terminal device also needs to sense the carrier in the carrier sense subframe, and when it is determined as a valid subframe as a result of the carrier sense, the terminal device transmits data in the uplink subframe, and the first of the valid subframes.
- a known signal such as PSS / SSS, a reference signal, and a training symbol may be transmitted as in the present embodiment.
- this embodiment can also be applied to FDD, and when ULB-CC is a downlink CC, it becomes like the configuration 2 or configuration 8 which is a frame configuration of only D and C in FIG.
- PSS / SSS transmission similar to that of the present embodiment may be performed.
- the present embodiment has been described focusing on one ULB-CC, a plurality of ULB-CCs may exist.
- the ULB base station apparatus performs carrier sense in each ULB-CC, determines whether it is a valid subframe or an invalid subframe based on the carrier sense result for each ULB-CC, and the first downlink of the valid subframe.
- the same PSS / SSS transmission as in the present embodiment may be performed.
- the timing of the ULB-CC subframe in the present embodiment may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- the ULB base station apparatus notifies the effective subframe by transmitting the PSS / SSS in the first OFDM symbol of the first downlink subframe of the effective subframe.
- a reference signal such as CRS, CSI-RS, or DMRS may be used instead of PSS / SSS, DRS (Discovery Reference Signal), PRS (Positioning Reference Signal), or the like may be used.
- a known signal such as a symbol may be transmitted.
- the ULB base station apparatus determines whether another system uses ULB-CC in the carrier sense subframe, and if it is usable, the first after the carrier sense subframe is determined. PSS / SSS is transmitted using the first OFDM symbol of the downlink subframe.
- the terminal apparatus can determine whether or not ULB-CC data can be transmitted / received using the first OFDM symbol of the first downlink subframe, and can share information on the result of efficient carrier sense. As a result, since the terminal device does not need to perform reception processing such as blind decoding when it is not an effective subframe, the amount of calculation can be reduced and power saving can be realized.
- Modification 1 of the first embodiment In this modification, the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in this modification, only different processing will be described, and description of similar processing will be omitted.
- the CS determination unit 106 and the synchronization signal multiplexing units 1013-1 and 1013-2 of the ULB base station apparatus are different from those in the first embodiment.
- the CS determination unit 106 determines whether another system uses ULB-CC in the carrier sense subframe.
- the CS determination unit 106 performs carrier sense over the entire period of the carrier sense subframe.
- carrier sense is performed with the OFDM symbol excluding the last OFDM symbol (symbol # 13) in the carrier sense subframe.
- the OFDM symbol for performing carrier sense is the OFDM symbol of the first slot (symbols # 0 to # 6).
- the synchronization signal multiplexing sections 1013-1 and 1013-2 determine whether another system is using ULB-CC, and input the result to the synchronization signal generation section 1016.
- the synchronization signal generation unit 1016 generates PSS / SSS as in the first embodiment, and inputs the PSS / SSS to the synchronization signal multiplexing units 1013-1 and 1013-2.
- FIG. 9 shows a PSS / SSS multiplexing method according to this modification.
- This drawing shows an example of placing the PSS / SSS in the last OFDM symbol of the subframe #Nss 2.
- #Nss 2 shows the carrier sense of the sub-frame.
- PSS and SSS have shown the example arrange
- the ULB base station apparatus arranges the PSS and SSS in the LB-CC as described above and arranges the PSS and SSS in the ULB-CC as shown in FIG. 9, the frequency band used for communication is LB-CC or ULB- The arrangement of PSS and SSS is changed depending on CC.
- the terminal apparatus detects the PSS / SSS included in the last OFDM symbol of the carrier sense subframe by the effective subframe determination unit 210. Therefore, if PSS / SSS is not detected in the last OFDM symbol of the carrier sense subframe, it is determined that the subsequent downlink and uplink subframes are not valid subframes, and blind decoding or downlink reference is performed. It is not necessary to perform RRM measurement using signals, downlink data reception, uplink data transmission, and the like.
- the radio transmission units 102-1 and 102-2 of the ULB base station apparatus include transmission power control units.
- the transmission power control unit lowers the transmission power in the OFDM symbol that transmits PSS / SSS, and downlink data Alternatively, transmission is performed without reducing transmission power in a subframe or OFDM symbol for transmitting a control signal. Also, the transmission power control unit transmits an OFDM symbol that transmits LB-CC PSS / SSS without reducing the transmission power.
- the ULB base station apparatus transmits PSS / SSS even in some OFDM symbols of a downlink subframe. Also good.
- the resource block for transmitting the PSS / SSS of the carrier sense subframe and the downlink subframe may be different.
- the ULB base station apparatus may arrange either PSS or SSS in all resource blocks in a carrier sense subframe, and arrange PSS and SSS in some resource blocks in a downlink subframe.
- the carrier sense subframe cycle has been described as an example of a 5 subframe cycle and a 10 subframe cycle.
- the present invention is not limited to this cycle, and the carrier sense subframe cycle is reduced within a predetermined cycle.
- the pattern of link and uplink subframes may be repeated.
- both PSS and SSS are arranged in the last OFDM symbol of the carrier sense subframe, but only one of PSS and SSS is arranged in the last OFDM symbol of the carrier sense subframe. You may do it.
- a synchronization signal that is not arranged in the last OFDM symbol may be arranged in the last OFDM symbol (symbol # 12) of the last carrier sense subframe.
- PSS / SSS is transmitted using the last OFDM symbol of the carrier sense subframe.
- the ULB base station apparatus may transmit RTS or CTS-to-self before transmitting PSS / SSS. good.
- NAV may be set in RTS.
- the ULB base station apparatus may transmit RTS and CTS-to-self transmission in a part of the carrier sense subframe.
- an example of the frame configuration is shown in FIG. 7 as an example of TDD, but it is not necessary to be a downlink subframe immediately after the carrier sense subframe as in the frame configuration example of FIG. It is also good.
- the configuration of the subframes may be C, U, U, U, D, C, U, U, D, D, C, U, D, D, D.
- This modification can also be applied to FDD, and when ULB-CC is a downlink CC, it becomes as shown in configuration 2 or configuration 8 which is a frame configuration of only D and C in FIG. In the first downlink subframe of the frame, the same PSS / SSS transmission as in the present modification may be performed.
- the ULB base station apparatus performs carrier sense in each ULB-CC, determines whether it is a valid subframe or an invalid subframe based on the carrier sense result for each ULB-CC, and the first downlink of the valid subframe.
- the same PSS / SSS transmission as in the present modification may be performed.
- the timing of the ULB-CC subframe in this modification may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- PSS / SSS is transmitted using the last OFDM symbol of a carrier sense subframe.
- the present embodiment is not limited to this example, and PSS is performed at any timing of a carrier sense subframe. If / SSS is transmitted, it is included in the present invention.
- the ULB base station apparatus notifies the effective subframe by transmitting the PSS / SSS in the last OFDM symbol of the carrier sense subframe in the ULB-CC, but is not limited to this example.
- a reference signal such as CRS, CSI-RS, or DMRS may be used instead of PSS / SSS, DRS or PRS may be used, or a known signal such as a training symbol may be transmitted. good.
- the ULB base station apparatus determines whether another system is using ULB-CC in the carrier sense subframe, and if it is usable, the last OFDM in the carrier sense subframe is determined. Transmit PSS / SSS with symbols.
- the terminal device can determine whether or not ULB-CC data can be transmitted and received by the last OFDM symbol of the carrier sense subframe, and can share information on the result of efficient carrier sense. As a result, the terminal device determines whether the ULB-CC can be used before the downlink subframe, and if it is not an effective subframe, it does not need to perform reception processing such as blind decoding, thereby reducing the amount of computation. And power saving can be realized.
- Modification 2 of the first embodiment In this modification, the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in this modification, only different processing will be described, and description of similar processing will be omitted.
- PSS / SSS is transmitted by the same method as Modification 1 of the first embodiment, and is arranged in the last OFDM symbol of the carrier sense subframe.
- the UL signal generation unit 211 of the terminal device is different from Modification 1 of the embodiment.
- the UL signal generation unit 211 generates an uplink transmission signal based on uplink subframe timing information notified from the valid subframe determination unit 210.
- Uplink transmission timing includes an uplink pilot time slot (UpPTS) included in a special subframe in addition to an uplink subframe.
- UpPTS is used for SRS and RACH transmission.
- the special subframe includes a GP, a downlink pilot time slot (DwPTS), and an uplink pilot time slot (UpPTS).
- the percentage of GP time included in the special subframe can be changed according to the special subframe configuration.
- one of the 13168T s is specified
- the terminal device when transmitting and SRS in UpPTS, starts transmission after T DL + T GP of special subframe.
- the ULB base station apparatus determines that the other system is not using ULB-CC as a result of carrier sense, it occupies time for one OFDM symbol + 4 subframes for transmitting PSS / SSS. To do. If the ULB-CC is occupied by communication between the ULB base station device and the terminal device, other systems cannot be used. Therefore, it is preferable to shorten the occupation time.
- T symb is the time of one OFDM symbol.
- the UL signal generation unit 211 generates a signal to be transmitted after T DL + T GP2 when transmitting SRS or the like using UpPTS.
- the radio reception unit 105 and the UL signal demodulation unit 107 of the ULB base station apparatus perform reception processing on the assumption that the terminal apparatus has transmitted an uplink signal after T DL + T GP2 of the special subframe.
- the terminal device when the terminal device calculates the transmission timing of the UpPTS, it has been described that the time GP and T GP2 in ULB-CC, the terminal device calculates the transmission timing of the UpPTS in LB-CC In this case, T GP may be used as usual. Therefore, the terminal apparatus may switch the UpPTS transmission timing of the special subframe between ULB-CC and LB-CC. Further, in this modification, although the terminal device has been described an example of subtracting the time 1OFDM symbol when calculating the T GP2, may subtract longer than 1OFDM symbols. For example, a compute transmission timings of the UpPTS terminal apparatus by subtracting the time 2OFDM symbols when calculating the T GP2. In such a case, the ULB base station apparatus may use one of the timings, such as after DwPTS, as the OFDM symbol for transmitting PSS / SSS, as the GP is shortened.
- the terminal apparatus calculates the UpPTS transmission start timing of the special subframe
- a value obtained by subtracting one OFDM symbol from the conventional GP time is applied. Therefore, without reducing the amount of resources that can be used for communication between the ULB base station apparatus and the terminal apparatus, the occupied time is transmitted from the PSS / SSS transmitted in the last OFDM symbol of the carrier sense subframe to the downlink subframe and uplink.
- the total time of subframes and special subframes can be reduced to the conventional time of 4 subframes (4 msec).
- the ULB base station apparatus determines whether the ULB base station apparatus is a valid subframe or an invalid subframe in a carrier sense subframe.
- a transmission method of ACK / NACK for downlink transmission when transmitting PSS / SSS will be described.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in the present embodiment, only different processing will be described, and description of similar processing will be omitted.
- the control signal generation unit 1017 When the ULB base station apparatus transmits downlink data, the control signal generation unit 1017 generates downlink resource allocation information (DL grant) and transmits it to the terminal apparatus.
- the control signal detection unit 209 detects resource allocation information (DL ⁇ ⁇ grant) by blind decoding, and performs data reception processing based on the resource allocation information.
- ACK / NACK which is information indicating whether or not the data is correctly detected, is generated by the UL control information generation unit 215.
- FIG. 10 shows an example of ACK / NACK transmission for the downlink according to the present invention.
- This figure is an example of timing correspondence when the radio transmission unit 213 of the terminal apparatus transmits uplink control information including ACK / NACK with respect to downlink resource allocation and data reception timing.
- the terminal apparatus allocates downlink resource and the data reception timing is any of subframes # 1, # 2, and # 3 of frame # 0
- the terminal apparatus allocates downlink resource allocation and data received subframe.
- ACK / NACK is transmitted in the uplink subframe that comes first after 4 subframes after the frame. In the example of FIG. 10, it is subframe # 9 of frame # 0.
- the terminal device can use subframe # 9 of frame # 0, so subframes # 1, # 2, ACK / NACK for data received in at least one of # 3 is transmitted in subframe # 9 of frame # 0.
- subframes # 5 to # 9 of frame # 0 are invalid subframes
- the terminal device cannot detect PSS / SSS, it determines that subframes # 5 to # 9 of frame # 0 are invalid subframes, and does not transmit ACK / NACK in subframe # 9 of frame # 0.
- the terminal apparatus transmits ACK / NACK in subframe # 9 of frame # 0 it collides with communication of other systems, and the ULB base station apparatus correctly receives ACK / NACK from ULB-CC. Probability of receiving decreases. Therefore, stable communication cannot be realized with ULB-CC.
- the ULB base station apparatus determines that subframes # 0 to # 4 of frame # 1 are valid subframes as a result of carrier sense in subframe # 0 of frame # 1, the ULB base station apparatus performs PSS / SSS. Send. By detecting PSS / SSS, the terminal device determines that subframe # 4 of frame # 1 is an uplink subframe that comes first four subframes after the subframe in which downlink data is received, and transmits ACK / NACK. To do.
- the terminal apparatus determines whether it is a valid subframe or an invalid subframe by another method, and the first valid four frames after the subframe from which downlink data is received, excluding the uplink subframe of the invalid subframe. If ACK / NACK is transmitted in the uplink subframe, it is included in the present invention.
- the present embodiment can also be applied to FDD, and when downlink and uplink CCs exist in the ULB-CC, from the subframe that received the downlink data excluding the uplink subframe of the invalid subframe.
- the ACK / NACK may be transmitted in the uplink ULB-CC effective subframe that comes first after four subframes.
- the present embodiment has been described focusing on one ULB-CC, a plurality of ULB-CCs may exist. In that case, the ACK / NACK transmission timing of this embodiment may be applied to each ULB-CC.
- the timing of the ULB-CC subframe in the present embodiment may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- the ULB base station apparatus and the terminal apparatus share information on valid subframes or invalid subframes, and the terminal apparatus transmits downlink data excluding uplink subframes of invalid subframes.
- ACK / NACK is transmitted in the uplink subframe that comes first four subframes after the received subframe.
- the ULB base station apparatus determines whether it is a valid subframe or an invalid subframe in the carrier sense subframe as in the second embodiment, and in the case of the valid subframe, the ULB base station apparatus performs PSS / SSS.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in this modification, only different processing will be described, and description of similar processing will be omitted.
- uplink resource allocation information (UL grant) is generated by the control signal generation unit 1017 and transmitted to the terminal apparatus.
- the control signal detection unit 209 detects resource allocation information (UL grant) by blind decoding, and performs data transmission processing based on the resource allocation information.
- the control signal generation unit 1017 generates ACK / NACK, which is information indicating whether the ULB base station apparatus has been correctly detected as a result of the data reception process.
- ACK / NACK for uplink data is notified by either or both of PDCCH / EPDCCH and PHICH (Physical Hybrid-ARQ Indicator CHannel).
- FIG. 12 shows an example of ACK / NACK transmission for the uplink according to the present invention.
- the radio transmission unit 213 of the terminal apparatus is the uplink data transmission timing for the uplink resource allocation information
- the radio transmission units 102-1 and 102-2 of the ULB base station apparatus are for the uplink data reception timing. It is an example of the matching of the timing which transmits the control information of downlink containing ACK / NACK. For example, if the reception timing of the uplink resource allocation is any one of subframes # 1, # 2, and # 3 of frame # 0, the terminal device first starts after 4 subframes from the uplink resource allocation. Data is transmitted in the coming uplink subframe. In the example of FIG. 12, it is subframe # 9 of frame # 0.
- the terminal device can use subframe # 9 of frame # 0, so subframes # 1, # 2, Data transmission for uplink resource allocation received in at least one of # 3 is performed in subframe # 9 of frame # 0.
- subframes # 5 to # 9 of frame # 0 are invalid subframes, except for the uplink subframe of invalid subframes, the first four frames after the subframe receiving the uplink resource allocation Data is transmitted in the coming uplink subframe.
- the ULB base station apparatus uses the downlink subframe that comes first four subframes after the subframe of uplink data transmission.
- ACK / NACK for uplink data is transmitted.
- subframes # 0 to # 4 of frame # 1 are valid subframes.
- the ULB base station apparatus performs ACK / NACK for uplink data in subframe # 3 of frame # 1. Send.
- subframes # 0 to # 4 of frame # 1 are invalid subframes
- the terminal device Since the terminal device cannot detect PSS / SSS, it determines that subframes # 0 to # 4 of frame # 1 are invalid subframes, and ACKs for uplink data in subframe # 6 of next frame # 1 at the earliest. It is determined that / NACK is transmitted.
- the ULB base station apparatus transmits ACK / NACK in subframe # 3 of frame # 1, it collides with communication of other systems, and the terminal apparatus correctly receives ACK / NACK in ULB-CC. Probability of receiving decreases. Therefore, stable communication cannot be realized with ULB-CC.
- the ULB base station apparatus determines that subframes # 5 to # 9 of frame # 1 are valid subframes as a result of carrier sense in subframe # 5 of frame # 1, the ULB base station apparatus performs PSS / SSS. Send. Furthermore, the ULB base station apparatus transmits ACK / NACK for uplink data received in subframe # 9 of frame # 0 in subframe # 6 of frame # 1. This is because subframe # 6 of frame # 1 corresponds to the downlink subframe that comes first four subframes after the subframe in which uplink data is received. By detecting PSS / SSS, the terminal apparatus determines that subframe # 6 of frame # 1 is the first downlink subframe that is four subframes after the subframe in which uplink data was transmitted, and receives ACK / NACK. Process.
- the terminal apparatus determines whether the subframe is a valid subframe or an invalid subframe by another method, and excluding the downlink subframe of the invalid subframe, the first valid four frames after the subframe receiving the uplink data. If ACK / NACK is transmitted in the downlink subframe, it is included in the present invention.
- this modified example can also be applied to FDD, and when UL and CC are present in ULB-CC, the subframe from which uplink data is received except for the downlink subframe of the invalid subframe is excluded.
- the ACK / NACK may be transmitted in the downlink ULB-CC effective subframe that comes first after four subframes.
- this modification has been described focusing on one of the ULB-CCs, a plurality of ULB-CCs may exist. In that case, the ACK / NACK transmission timing of this modification may be applied to each ULB-CC.
- the timing of the ULB-CC subframe in this modification may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus. If there is no valid subframe in a certain period from the uplink resource allocation information or uplink data transmission timing, ACK / NACK for uplink data is transmitted with a different CC (for example, LB-CC). Also good.
- the ULB base station apparatus and the terminal apparatus share information on valid subframes or invalid subframes, and the terminal apparatus removes uplink data except downlink subframes of invalid subframes.
- ACK / NACK is transmitted in a downlink subframe that comes first four subframes after the received subframe.
- Modification 2 of the second embodiment In this modification, as in the second embodiment and the first modification of the second embodiment, it is determined whether the ULB base station apparatus is a valid subframe or an invalid subframe in the carrier sense subframe, and the valid subframe is determined. In this case, a transmission method of ACK / NACK for downlink transmission when the ULB base station apparatus transmits PSS / SSS will be described.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in this modification, only different processing will be described, and description of similar processing will be omitted.
- the control signal generation unit 1017 When the ULB base station apparatus transmits downlink data, the control signal generation unit 1017 generates downlink resource allocation information (DL grant) and transmits it to the terminal apparatus.
- the control signal detection unit 209 detects resource allocation information (DL ⁇ ⁇ grant) by blind decoding, and performs data reception processing based on the resource allocation information.
- ACK / NACK which is information indicating whether or not the data is correctly detected, is generated by the UL control information generation unit 215.
- FIG. 14 shows an example of ACK / NACK transmission for the downlink according to the present invention.
- This figure is an example of timing correspondence when the radio transmission unit 213 of the terminal apparatus transmits uplink control information including ACK / NACK with respect to downlink resource allocation and data reception timing.
- the terminal apparatus allocates downlink resource and the data reception timing is any of subframes # 1, # 2, and # 3 of frame # 0
- the terminal apparatus allocates downlink resource allocation and data received subframe.
- ACK / NACK is transmitted in the uplink subframe that comes first after 4 subframes after the frame. In the example of FIG. 14, it is subframe # 9 of frame # 0.
- the terminal device can use subframe # 9 of frame # 0, so subframes # 1, # 2, ACK / NACK for data received in at least one of # 3 is transmitted in subframe # 9 of frame # 0.
- the ULB base station apparatus performs carrier sense and subframes # 5 to # 7 of frame # 0 are invalid subframes, the operation shown in FIG. 14 is performed.
- the ULB base station apparatus does not transmit PSS / SSS. Therefore, since the terminal device cannot detect PSS / SSS, it determines that subframes # 5 to # 7 of frame # 0 are invalid subframes.
- the ULB base station apparatus performs carrier sense in the subframe before the uplink subframe (subframe # 8 of frame # 0). For example, carrier sense is performed in the first slot of subframe # 8 of frame # 0.
- the PSS is used in the last OFDM symbol of subframe # 8 of frame # 0 as shown in FIG. / SSS is transmitted.
- the terminal apparatus detects PSS / SSS in subframe # 8 of frame # 0, determines that subframe # 9 of frame # 0 is a valid subframe, and transmits ACK / NACK.
- the terminal apparatus determines whether it is a valid subframe or an invalid subframe by another method, and the uplink that comes first after 4 subframes after receiving the downlink data, excluding the uplink subframe of the invalid subframe. If ACK / NACK is transmitted in the link subframe, it is included in the present invention.
- this modification has been described as the timing of ACK / NACK transmission for downlink resource allocation and data reception, this modification may be applied to the timing of uplink data transmission for uplink resource allocation.
- the ULB base station apparatus performs carrier sense in subframe # 8 of frame # 0, but the terminal apparatus performs carrier sense in subframe # 8 and is not occupied by another system.
- ACK / NACK may be transmitted in subframe # 9 of frame # 0.
- the special subframe of subframe # 8 of frame # 0 is described as the carrier sense subframe. It may always be handled as a carrier sense subframe.
- this modification can also be applied to FDD.
- UL and CC are present in the ULB-CC, the subframe from which the downlink data is received except the uplink subframe of the invalid subframe is excluded.
- the terminal apparatus may perform carrier sense before the uplink ULB-CC subframe after 4 subframes.
- this modification has been described focusing on one of the ULB-CCs, a plurality of ULB-CCs may exist.
- the transmission timing of ACK / NACK may be determined in each ULB-CC based on the carrier sense result of the terminal device as in this modification.
- the timing of the ULB-CC subframe in this modification may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- the terminal device when the terminal device performs carrier sense, only the frequency band used for transmission is carrier sensed among all frequency bands that can be used for ULB-CC data transmission, and the ULB base station device performs ULB-CC data transmission. All frequency bands that can be used for transmission may be carrier sensed.
- the ULB base station apparatus and the terminal apparatus share information on valid subframes or invalid subframes, and the terminal apparatus transmits downlink data excluding uplink subframes of invalid subframes.
- ACK / NACK is transmitted in the uplink subframe that comes first four subframes after the received subframe.
- the ULB base station apparatus determines whether the ULB base station apparatus is a valid subframe or an invalid subframe in the carrier sense subframe.
- a transmission method of ACK / NACK for downlink transmission when transmitting PSS / SSS will be described.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in the present embodiment, only different processing will be described, and description of similar processing will be omitted.
- the control signal generation unit 1017 When the ULB base station apparatus transmits downlink data, the control signal generation unit 1017 generates downlink resource allocation information (DL grant) and transmits it to the terminal apparatus.
- the control signal detection unit 209 detects resource allocation information (DL ⁇ ⁇ grant) by blind decoding, and performs data reception processing based on the resource allocation information.
- ACK / NACK which is information indicating whether or not the data is correctly detected, is generated by the UL control information generation unit 215.
- FIG. 15 shows an example of ACK / NACK transmission for the downlink according to the present invention.
- This figure is an example of timing correspondence when the radio transmission unit 213 of the terminal apparatus transmits uplink control information including ACK / NACK with respect to downlink resource allocation and data reception timing.
- the terminal device is downlink resource allocation and the data reception timing is any one of ULB-CC subframes # 1, # 2, and # 3, the terminal device allocates downlink resource allocation and data received subframes.
- ACK / NACK is transmitted in the uplink subframe that comes first after 4 subframes after the frame. In the example of FIG. 15, it is ULB-CC subframe # 9.
- the terminal device can use the ULB-CC subframe # 9, so the ULB-CC subframes # 1, # 2, ACK / NACK for data received in at least one of # 3 is transmitted in subframe # 9 of ULB-CC.
- ACK / NACK is transmitted without error, and when it cannot be transmitted by ULB-CC, it is necessary to transmit it reliably by LB-CC. If ACK / NACK can be transmitted by both LB-CC and ULB-CC, LB-CC resources may be used preferentially.
- the terminal apparatus determines whether it is a valid subframe or an invalid subframe by another method, and the uplink that comes first after 4 subframes after receiving the downlink data, excluding the uplink subframe of the invalid subframe. If ACK / NACK is transmitted in the link subframe, it is included in the present invention.
- the present embodiment has been described as the timing of ACK / NACK transmission for downlink resource allocation and data reception, the present embodiment may be applied to the timing of uplink data transmission for uplink resource allocation.
- the ULB base station apparatus performs carrier sense in the ULB-CC subframe # 0 is shown.
- the ULB-CC subframe # 8 performs ULB
- the base station device or the terminal device may perform carrier sense.
- ULB-CC subframe # 9 may transmit ACK / NACK in the valid subframe.
- the special subframe of the ULB-CC subframe # 8 is used as a carrier sense subframe, and the special subframe is always a carrier. It may be treated as a sense subframe.
- an example is shown in which both downlink resource allocation and downlink data transmission are transmitted by ULB-CC.
- downlink resource allocation is LB-CC
- downlink data transmission is ULB-CC. It may be sent by.
- LB-CC an example in which there is one LB-CC is shown, but a plurality of LB-CCs may exist, and when ACK / NACK cannot be transmitted by ULB-CC, a predetermined LB-CC is used.
- the LB-CC for transmitting the ACK / NACK may be determined based on the priorities of LB-CC and information such as the LB-CC associated with the ULB-CC. Also, this embodiment can be applied to FDD.
- ACK / NACK may be transmitted by uplink LB-CC.
- the ULB base station apparatus and the terminal apparatus share information on valid subframes or invalid subframes, and the terminal apparatus determines that ULB-CC is an invalid subframe at the transmission timing of ACK / NACK. If it is determined, ACK / NACK is transmitted by LB-CC. As a result, even if another system occupies the ULB-CC between the reception of the downlink data and the ACK / NACK transmission, the collision can be avoided, and the deterioration of the communication quality in the ULB-CC can be suppressed. Frequency utilization efficiency is improved.
- the terminal device transmits ACK / NACK to LB-CC without delay with respect to the conventional ACK / NACK timing even if ULB-CC is an invalid subframe at the transmission timing of ACK / NACK. can do. Furthermore, even if another system occupies the carrier sense subframe before the downlink subframe, the carrier sense is performed before the uplink subframe. As a result, if another system is completed before the uplink subframe, the uplink transmission opportunity increases because only the uplink subframe can be used even if the downlink subframe cannot be used. Frequency utilization efficiency is improved.
- the ULB base station apparatus determines whether the ULB base station apparatus is a valid subframe or an invalid subframe in the carrier sense subframe. A method for transmitting uplink data when transmitting PSS / SSS will be described.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in the present embodiment, only different processing will be described, and description of similar processing will be omitted.
- a synchronization signal generation unit 1016 of the ULB base station apparatus is different from that in the first embodiment.
- the CS determination unit 106 determines that the subframe # 0 of the frame # 0 is an effective subframe that is not occupied by another system, information on the effective subframe is input to the synchronization signal generation unit 1016.
- the synchronization signal generation unit 1016 is notified of the amount of data buffered for transmission from the data amount management unit included in the S / P unit 1011.
- the synchronization signal generation unit 1016 generates the PSS / SSS of the synchronization signal in the case of an effective subframe, but changes the sequence to be generated according to the buffered data amount.
- the root sequence index and the initial value of the shift register are changed according to the amount of buffered data.
- the threshold value of the buffered data amount for determining whether to change the root sequence index or the initial value of the shift register may be determined in advance by the system. For example, a different series of PSS / SSS is generated only when there is no downlink transmission data. Further, although an example of changing the root sequence index and initial value of the sequence has been described, the sequence itself may be changed.
- the terminal device is notified in advance as control information of the sequence used as the PSS / SSS, calculates the correlation value between the candidate sequence to be transmitted and the received PSS / SSS, and the PSS / SSS is transmitted in any sequence. It is determined whether it is done.
- the terminal device detects a PSS / SSS sequence used when the amount of data buffered for downlink in the ULB base station device exceeds the threshold, the terminal device is the same as in the previous embodiment. Perform processing.
- the terminal apparatus performs the following process.
- the terminal apparatus receives uplink resource allocation in any of subframes # 1, # 2, and # 3 of frame # 0 in FIG. 12, and further receives frame # 0 in PSS / SSS transmitted from the ULB base station apparatus. It is determined whether the subframes # 5 to # 9 are effective subframes. When PSS / SSS indicating that subframes # 5 to 9 of frame # 0 are valid subframes is a sequence used when the amount of data buffered for downlink in the ULB base station apparatus exceeds a threshold value The terminal apparatus regards subframe # 8 of frame # 0 as a carrier sense subframe.
- radio reception sections 202-1 and 202-2 of the terminal apparatus perform carrier sense in subframe # 8 of frame # 0, and whether or not to transmit uplink data in subframe # 9 of frame # 0 based on the result To decide. If uplink data cannot be transmitted in subframe # 9 of frame # 0, the terminal device transmits uplink data by any of the methods described in the previous embodiment. It is assumed that the terminal device is notified in advance of sequences that the ULB base station device may transmit, or is set in units of system and ULB-CC, and is buffered for these sequences and downlink. It is assumed that the relationship of the data amount is also notified in the same manner, or is set in units of system and ULB-CC.
- the terminal apparatus receives downlink resource allocation and data in any of subframes # 1 to # 3 of frame # 0, and receives frame # in PSS / SSS transmitted from the ULB base station apparatus. It is determined whether the 0 subframes # 5 to # 9 are valid subframes.
- PSS / SSS indicating that subframes # 5 to 9 of frame # 0 are valid subframes is a sequence used when the amount of data buffered for downlink in the ULB base station apparatus exceeds a threshold value
- the terminal apparatus regards subframe # 8 of frame # 0 as a carrier sense subframe.
- radio receiving sections 202-1 and 202-2 of the terminal apparatus perform carrier sense in subframe # 8 of frame # 0, and whether or not to transmit ACK / NACK in subframe # 9 of frame # 0 based on the result To decide. If uplink data cannot be transmitted in subframe # 9 of frame # 0, the terminal apparatus transmits ACK / NACK by any of the methods described in the previous embodiment.
- the terminal apparatus notifies whether or not to perform carrier sense before transmitting ACK / NACK for uplink data or downlink data in a PSS / SSS sequence. Further information may be notified in the / SSS series. For example, when there are a plurality of candidate PSS / SSS sequences to be transmitted and there are a plurality of candidate ULB-CCs in which the terminal apparatus transmits ACK / NACK for uplink data or downlink data, the PSS / SSS Depending on the sequence, it may be notified which CC (ULB-CC or CC) transmits these signals.
- CC ULB-CC
- the terminal apparatus performs carrier sense.
- the ULB base station apparatus May have a career sense.
- the ULB base station apparatus determines that the uplink subframe is a valid subframe as a result of carrier sense, the ULB base station apparatus notifies the terminal apparatus by transmitting PSS / SSS.
- the transmission timing of the PSS / SSS may be any timing of the special subframe, for example, may be transmitted using a part of OFDM symbols (such as the last OFDM symbol) of DwPTS, or may be transmitted using a part of GP.
- the present embodiment can also be applied to FDD, and when there are downlink and uplink CCs in the ULB-CC, depending on the PSS / SSS sequence transmitted by the ULB base station apparatus, the valid subframe or invalid subframe is used. It is only necessary to notify whether the terminal apparatus needs to perform carrier sense in the subframe before transmission of ACK / NACK in the ULB-CC of the uplink and the information on the frame.
- the present embodiment has been described focusing on one ULB-CC, a plurality of ULB-CCs may exist. In that case, the ACK / NACK transmission timing of this embodiment may be applied to each ULB-CC.
- the timing of the ULB-CC subframe in the present embodiment may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- the terminal apparatus it is necessary for the terminal apparatus to perform carrier sense before the uplink subframe and the information on the valid subframe or the invalid subframe based on the PSS / SSS sequence transmitted by the ULB base station apparatus. Notify As a result, even if another system occupies the ULB-CC during the uplink data transmission from the timing at which the ULB base station apparatus senses the carrier, collision can be avoided, and the communication quality in the ULB-CC decreases. By suppressing the frequency utilization efficiency is improved.
- the ULB base station apparatus determines whether it is a valid subframe or an invalid subframe in the carrier sense subframe as in the previous embodiment, and if it is a valid subframe, the ULB base station apparatus transmits PSS / SSS. A method for transmitting uplink data in the case of doing so will be described.
- the configuration examples of the ULB base station device and the terminal device are the same as those in the first embodiment, and are shown in FIGS. 4 and 6, respectively.
- the configuration example of the DL signal generation unit 101 of the ULB base station apparatus is the same as that of the first embodiment, and is as shown in FIG. Therefore, in this modification, only different processing will be described, and description of similar processing will be omitted.
- the S / P unit 1011 of the ULB base station apparatus is different from the first embodiment.
- the CS determination unit 106 determines that the subframe # 0 of the frame # 0 is an effective subframe that is not occupied by another system, information on the effective subframe is input to the S / P unit 1011.
- the data amount management unit included in the S / P unit 1011 manages information on the amount of data buffered for transmission. When the data amount falls below the threshold, dummy data is transferred to the data signal generation unit 1012-1, Input to 1012-2.
- the threshold of the buffered data amount for determining whether or not dummy data is input may be determined in advance by the system.
- the ULB base station apparatus transmits dummy data so that it can be recognized that communication is being performed between the ULB base station apparatus and the terminal apparatus even if another system performs carrier sense. Note that the density of the reference signal may be increased instead of the dummy data.
- the ULB base station apparatus may transmit RTS or CTS-to-self, or may set NAV.
- the present embodiment has been described focusing on one of the ULB-CCs, a plurality of ULB-CCs may exist.
- the ACK / NACK transmission timing of this embodiment may be applied to each ULB-CC.
- the timing of the ULB-CC subframe in the present embodiment may be synchronized by synchronizing between the ULB base station apparatus and the terminal apparatus, or the timing of the LB-CC and subframe of the macro base station apparatus. Thus, the timing may be matched between the ULB base station apparatus and the terminal apparatus.
- the ULB base station apparatus can secure resources from uplink resource allocation to uplink transmission. As a result, it is possible to avoid collision by preventing another system from occupying the ULB-CC during the uplink data transmission from the timing at which the ULB base station apparatus senses the carrier, thereby reducing the communication quality in the ULB-CC. By suppressing the frequency utilization efficiency is improved.
- the program that operates in the base station apparatus and terminal apparatus related to the present invention is a program that controls the CPU or the like (a program that causes a computer to function) so as to realize the functions of the above-described embodiments related to the present invention.
- Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary.
- a recording medium for storing the program a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient.
- the processing is performed in cooperation with the operating system or other application programs.
- the functions of the invention may be realized.
- the program when distributing to the market, can be stored in a portable recording medium for distribution, or transferred to a server computer connected via a network such as the Internet.
- the storage device of the server computer is also included in the present invention.
- part or all of the base station apparatus and terminal apparatus in the above-described embodiment may be realized as an LSI that is typically an integrated circuit.
- Each functional block of the base station apparatus and the terminal apparatus may be individually chipped, or a part or all of them may be integrated into a chip.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. When each functional block is integrated, an integrated circuit controller for controlling them is added.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- an integrated circuit based on the technology can also be used.
- the terminal device of the present invention is not limited to application to a mobile station device, but is a stationary or non-movable electronic device installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning / washing equipment Needless to say, it can be applied to air conditioning equipment, office equipment, vending machines, and other daily life equipment.
- Control signal generator 1018-1 to 1018-2 Reference signal generators 1019-1 to 1019-2 IFFT units 201-1 to 201-2 Receive antennas 202-1 to 202-2 Wireless reception Units 203-1 to 203-2 ... FFT unit 205-1 to 205-2 ... Control signal separation unit 206-1 to 206-2 ... Reference signal separation unit 207 ... Received signal detection unit 208 ... Propagation path estimation unit 209 ... Control Signal detection unit 210 ... Effective subframe determination unit 211 ... UL signal generation unit 212 ... UL control information multiplexing unit 213 ... Radio transmission unit 214 ... Transmission antenna 215 ... UL control information generation unit
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Abstract
Description
以下、図面を参照しながら、実施形態について説明する。図1は、本発明に係るシステムの構成の一例を示す。該システムは、マクロ基地局装置10、ULB基地局装置11、端末装置21、22から構成される。なお、端末装置(端末、移動端末、移動局、UE: User Equipment)の数は2に限定されない他、各装置のアンテナ数は1であっても良いし、複数あっても良い。また、マクロ基地局装置10は無線事業者がサービスを提供する国や地域から使用許可が得られた、いわゆるライセンスバンド(licensed band)による通信を行ない、ULB基地局装置11は国や地域からの使用許可を必要としない、いわゆるアンライセンスバンド(unlicensed band)による通信を行なうものとしているが、この例に限定されない。例えば、マクロ基地局装置10がライセンスバンドだけでなく、アンライセンスバンドによる通信をサポートしても良いし、ライセンスバンドでの通信が可能なピコ基地局装置(Pico eNB: evolved Node B、SmallCell、Low Power Node、Remote Radio Headとも呼称される)がアンライセンスバンドによる通信をサポートしても良い。また、アンライセンスバンドは、ULB基地局装置11から端末装置21への通信である下り回線(ダウンリンクまたは下りリンク)のみでも良いし、ダウンリンクだけでなく端末装置21からULB基地局装置11への通信である上り回線(アップリンクまたは上りリンク)もサポートしても良い。また、本明細書ではライセンスバンド以外の周波数帯域として、アンライセンスバンドを例に説明を行なうが、本発明はこれに限定されない。
本変形例では、ULB基地局装置、端末装置の構成例は、第1の実施形態と同様であり、それぞれ図4、図6である。ULB基地局装置のDL信号生成部101の構成例も第1の実施形態と同様であり、図5となる。そのため、本変形例では、異なる処理のみを説明し、同様の処理の説明は省略する。
本変形例では、ULB基地局装置、端末装置の構成例は、第1の実施形態と同様であり、それぞれ図4、図6である。ULB基地局装置のDL信号生成部101の構成例も第1の実施形態と同様であり、図5となる。そのため、本変形例では、異なる処理のみを説明し、同様の処理の説明は省略する。
本発明の第2の実施形態では、前実施形態のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のダウンリンク送信のACK/NACKの送信方法について説明する。
本変形例では、第2の実施形態のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のダウンリンク送信のACK/NACKの送信方法について説明する。
本変形例では、第2の実施形態、第2の実施形態の変形例1のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のダウンリンク送信のACK/NACKの送信方法について説明する。
本発明の第3の実施形態では、前実施形態のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のダウンリンク送信のACK/NACKの送信方法について説明する。
本発明の第4の実施形態では、前実施形態のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のアップリンクのデータの送信方法について説明する。
本変形例では、前実施形態のようにキャリアセンスのサブフレームでULB基地局装置が有効サブフレームもしくは無効サブフレームかを判定し、有効サブフレームの場合はULB基地局装置がPSS/SSSを送信する場合のアップリンクのデータの送信方法について説明する。
11…ULB基地局装置
21、22…端末装置
101…DL信号生成部
102-1~102-2…無線送信部
103-1~103-2…送信アンテナ
104…受信アンテナ
105…無線受信部
106…CS判定部
107…UL信号復調部
1011…S/P部
1012-1~1012-2…データ信号生成部
1013-1~1013-2…同期信号多重部
1014-1~1014-2…制御信号多重部
1015-1~1015-2…参照信号多重部
1016-1~1016-2…同期信号生成部
1017-1~1017-2…制御信号生成部
1018-1~1018-2…参照信号生成部
1019-1~1019-2…IFFT部
201-1~201-2…受信アンテナ
202-1~202-2…無線受信部
203-1~203-2…FFT部
205-1~205-2…制御信号分離部
206-1~206-2…参照信号分離部
207…受信信号検出部
208…伝搬路推定部
209…制御信号検出部
210…有効サブフレーム判定部
211…UL信号生成部
212…UL制御情報多重部
213…無線送信部
214…送信アンテナ
215…UL制御情報生成部
Claims (11)
- 専用的に使用できる第一の周波数帯域とは異なる第二の周波数帯域で端末装置と通信する基地局装置であって、
前記端末装置へデータや制御情報を送信する無線送信部と、
前記端末装置から送信されたデータや制御情報を受信する無線受信部と、を有し、
前記無線送信部が前記端末装置へデータ送信し、前記データ送信に対するACK/NACKの受信タイミングで他のシステムが前記第二の周波数帯域で通信を行なっている場合、前記無線受信部は、前記他のシステムの通信が終了後の最初のアップリンクのサブフレームで前記端末装置から送信されるACK/NACKの受信処理を行なう基地局装置。 - 前記無線送信部は、前記端末装置のデータ送信用のリソース割当の制御情報を送信し、前記リソース割当に対するデータの受信タイミングで他のシステムが前記第二の周波数帯域で通信を行なっている場合、前記無線受信部は、前記他のシステムの通信が終了後の最初のアップリンクのサブフレームで前記端末装置から送信されるデータの受信処理を行なう請求項1記載の基地局装置。
- 専用的に使用できる第一の周波数帯域と前記第一の周波数帯域とは異なる第二の周波数帯域で端末装置と通信する基地局装置であって、
前記端末装置へデータや制御情報を送信する無線送信部と、
前記端末装置から送信されたデータや制御情報を受信する無線受信部と、を有し、
前記無線送信部が前記端末装置へデータ送信し、前記データ送信に対するACK/NACKの受信タイミングで他のシステムが前記第二の周波数帯域で通信を行なっている場合、前記無線受信部は、前記第一の周波数帯域で前記端末装置から送信されるACK/NACKの受信処理を行なう基地局装置。 - 前記無線受信部は、前記端末装置より送信されたデータを受信し、前記データ送信に対するACK/NACKの送信タイミングで他のシステムが前記第二の周波数帯域で通信を行なっている場合、前記第一の周波数帯域で前記端末装置へACK/NACKを送信する請求項3記載の基地局装置。
- ダウンリンクのバッファされているデータ量を管理するデータ量管理部を有し、
前記ダウンリンクのバッファされているデータ量がない場合、前記無線送信部は、RTSやCTS-to-SelfによりNAVを通知する、またはダミーデータを送信する請求項3記載の基地局装置。 - 専用的に使用できる第一の周波数帯域とは異なる第二の周波数帯域で基地局装置と通信する端末装置であって、
前記基地局装置より送信される同期信号を検出する有効サブフレーム判定部と、
前記基地局装置より送信されるデータ信号の受信処理を行なう受信信号検出部と、
前記基地局装置へ信号を送信する無線送信部と、を有し、
前記無線送信部は、前記受信信号検出部で前記基地局装置より送信される前記データ信号を正しく受信できたかを示すACK/NACKを送信する場合、前記データ信号を受信したタイミングから4サブフレーム後のアップリンクサブフレーム、かつ前記基地局装置より他のシステムが前記第二の周波数帯域で通信を行なっていないことの通知を有効サブフレーム判定部で受信した後に前記ACK/NACKを送信する端末装置。 - 前記基地局装置へのデータ送信に用いられるリソース割当を含む制御情報を検出する制御信号検出部を有し、
前記制御信号検出部が、前記基地局装置より送信されるデータ送信に用いられるリソース割当を含む制御情報を検出した場合、
前記無線送信部は、前記リソース割当を受信したタイミングから4サブフレーム後のアップリンクサブフレーム、かつ前記基地局装置より他のシステムが前記第二の周波数帯域で通信を行なっていないことの通知を受信した後に前記基地局装置へデータを送信する請求項6記載の端末装置。 - 前記第二の周波数帯域で他のシステムが通信を行なっているかを判別するキャリアセンスを行なう無線受信部を有し、
前記無線受信部は、ダウンリンクからアップリンクに切り替わるサブフレームでキャリアセンスを行なう請求項6記載の端末装置。 - 前記無線受信部がキャリアセンスをするダウンリンクからアップリンクに切り替わるサブフレームは、前記基地局装置へ送信するデータまたはダウンリンクデータに対する前記ACK/NACKを送信するサブフレームの前のダウンリンクからアップリンクに切り替わるサブフレームである請求項8記載の端末装置。
- 前記無線受信部は、前記基地局装置へ送信するデータまたはダウンリンクデータに対する前記ACK/NACKを送信する周波数帯域のみキャリアセンスする請求項8記載の端末装置。
- 前記有効サブフレーム判定部で前記基地局装置より送信される前記同期信号の検出ができない、または前記無線受信部のキャリアセンスの結果、前記第二の周波数帯域で他のシステムが通信をしている場合、
前記無線受信部は、前記基地局装置へ送信するデータまたはダウンリンクデータに対する前記ACK/NACKの送信に第一の周波数帯域を用いる請求項8記載の端末装置。
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