WO2010016261A1 - 周波数帯域割当方法及び送信装置 - Google Patents
周波数帯域割当方法及び送信装置 Download PDFInfo
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- WO2010016261A1 WO2010016261A1 PCT/JP2009/003778 JP2009003778W WO2010016261A1 WO 2010016261 A1 WO2010016261 A1 WO 2010016261A1 JP 2009003778 W JP2009003778 W JP 2009003778W WO 2010016261 A1 WO2010016261 A1 WO 2010016261A1
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- lte
- band
- pucch
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- uplink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0066—Requirements on out-of-channel emissions
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/12—Fixed resource partitioning
Definitions
- the present invention relates to an LTE system and an uplink frequency band allocation method of an LTE + system in a mixed system in which an LTE (Long-Term Evolution-Advanced) system and an LTE + (Long Term Evolution-Advanced) system coexist, and transmission applied to the mixed system Relates to the device.
- LTE Long-Term Evolution-Advanced
- LTE + Long Term Evolution-Advanced
- DL downlink
- a radio communication base station apparatus hereinafter abbreviated as a base station
- a radio communication mobile station apparatus hereinafter abbreviated as a mobile station
- UL Uplink
- the uplink and downlink are associated with each other.
- ARQ Automatic Repeat Request
- the mobile station sends a response signal indicating an error detection result of the downlink data to the uplink.
- CRC Cyclic Redundancy Check
- the base station transmits control information for notifying the resource allocation result of downlink data to the mobile station.
- This control information is transmitted to the mobile station using a downlink control channel such as PDCCH (Physical Downlink Control Channel).
- PDCCH Physical Downlink Control Channel
- Each PDCCH occupies one or more CCEs.
- Control Channel Element When one PDCCH occupies a plurality of CCEs (Control Channel Element), one PDCCH occupies a plurality of continuous CCEs.
- the base station allocates any PDCCH among a plurality of PDCCHs to each mobile station, and physical resources corresponding to CCEs (Control Channel Element) occupied by each PDCCH Control information is mapped to and transmitted.
- Each mobile station can determine the PUCCH used for transmission of the response signal from the own station from the CCE corresponding to the physical resource to which the control information for the own station is mapped in accordance with this association.
- Patent Document 1 proposes a frequency overlay system.
- Patent Literature 1 when an old communication system and a new communication system coexist for the purpose of improving frequency utilization efficiency, the new communication system is designed to include the frequency of the old communication system. Scheduling is performed including the frequency of the old communication system. Further, the design is made to improve the channel estimation accuracy by lowering the correlation between the preamble channel (reference signal) used in the old communication system and the preamble channel (reference signal) used in the new communication system. In addition, a control channel is provided separately for the new communication system and the old communication system, and is transmitted in different frequency bands. In the method disclosed in Patent Document 1, the old communication system and the new communication system are operated with the same frequency arrangement in both the uplink and the downlink.
- Non-Patent Document 1 proposes a frequency arrangement in which the LTE system and the LTE + system coexist with the old communication system as LTE and the new communication system as LTE +.
- both the uplink and the downlink are arranged at a low frequency.
- the center frequency of the downlink of the LTE system is different from the center frequency of the downlink of the LTE + system. Therefore, for initial synchronization or HO (handover) control, it is necessary to separately transmit control channels such as SCH (Synchronous Channel) and BCH (Broadcast Channel) at each frequency for both LTE and LTE +. is there.
- SCH Synchronous Channel
- BCH Broadcast Channel
- FIG. 1 shows an example in which the LTE DL band is 10 MHz and the LTE + DL band is 40 MHz.
- the LTE + DL band is arranged so as to spread on both sides around the center frequency of the LTE DL band.
- LTE SCH and BCH are transmitted using the center frequency of LTE. Note that the SCH is common to LTE and LTE +. Also, BCH + is transmitted in the LTE + DL band with the BCH difference or the like as BCH +.
- FIG. 1 shows the UL band corresponding to the DL band arranged as shown in FIG.
- the center 10 MHz of the UL band is allocated to the LTE UL band
- 40 MHz overlapping with the LTE UL band is allocated to the LTE + UL band.
- PUCCH and PUCCH + are arranged at both ends of the uplink of each system.
- PUCCH is an uplink control channel for LTE
- PUCCH + is an uplink control channel for LTE +.
- the PUCCH is arranged on the left and right sides separated from the center frequency by 5 MHz
- the PUCCH + is arranged on the left and right sides separated from the center frequency by 20 MHz.
- An object of the present invention is to provide a frequency allocation method and a transmission apparatus capable of reducing PAPR when single carrier transmission is performed on an uplink of an LTE + system in a mixed system in which an LTE system and an LTE + system coexist. is there.
- the frequency band allocation method includes a first communication system in which terminals performing single carrier transmission are mixed in an uplink, and an uplink having a maximum bandwidth narrower than the maximum bandwidth of the uplink of the first communication system.
- a continuous frequency band is assigned to the uplink of the first communication system.
- the transmission apparatus uses a first communication system in which terminals for single carrier transmission are mixed in an uplink, and an uplink having a narrower maximum bandwidth than the maximum bandwidth of the uplink of the first communication system.
- acquisition means for acquiring information on continuous frequency bands assigned to the uplink of the first communication system, and assignment to the uplink of the first communication system
- a transmission means for performing single carrier transmission in a continuous frequency band.
- PAPR in a mixed system in which an LTE system and an LTE + system coexist, PAPR can be reduced when single carrier transmission is performed on the uplink of the LTE + system.
- band of the mixed system in which a LTE system and a LTE + system coexist The figure which shows the example of arrangement
- positioning of DL band and UL band which concerns on Embodiment 2 of this invention The figure which shows the example 2 (a) of arrangement
- FIG. The figure which shows the example 2 (b) of arrangement
- FIG. The figure which shows the example 3 (b) of arrangement
- FIG. The figure which shows the example 3 (c) of arrangement
- FIG. The figure which shows the example 3 (d) of arrangement
- LTE Long Term Evolution
- LTE + also called “LTE Advanced”, “IMT advanced” or “4G”
- BCH Broadcast Channel
- SIB System Information Block included in D-BCH (Dynamic-Broadcast Channel) is used for notification.
- the PUCCH is a channel for transmitting control information such as ACK / NACK information and CQI information.
- the LTE mobile station apparatus (hereinafter also referred to as “mobile station”) uses the PUCCH to obtain a CRC result (ACK) for downlink data. / NACK information etc.) to the base station apparatus (hereinafter also referred to as “base station”).
- ACK CRC result
- base station base station apparatus
- the PUCCH is transmitted by sequentially using the band inside the LTE band.
- the old communication system and the new communication system are not limited to LTE and LTE +, and a new communication system that performs single carrier transmission on the uplink and an uplink having a narrower maximum bandwidth than the maximum bandwidth of the uplink of the new communication system.
- the present invention is applicable to a mixed system in which an old communication system using a line coexists.
- the maximum bandwidth refers to the maximum bandwidth of the system uplink.
- the maximum bandwidth of the uplink of the LTE system is 20 MHz
- the maximum bandwidth of the uplink of the LTE + system is 100 MHz.
- the maximum bandwidth of the uplink in the LTE + system is not necessarily allocated to the LTE + base station.
- the bandwidth allocated for operation is set from a plurality of candidates equal to or less than the maximum bandwidth for each base station. Since the bandwidth for LTE + and the bandwidth for LTE are set separately, the bandwidth allocated for LTE + may be smaller than the bandwidth allocated for LTE.
- PUCCH is a control channel for feeding back ACK or NACK, it may be referred to as an ACK / NACK channel.
- the LTE uplink band is arranged close to the low band, and the LTE + uplink band is arranged close to the high band.
- the uplink control channel such as PUCCH
- PUCCH uplink control channel
- FIG. 2 shows an arrangement example of the LTE band and the LTE + band in the DL band and the UL band according to the present embodiment.
- the LTE band is a band used in the LTE system
- the LTE + band is a band used in the LTE + system.
- the LTE band and the LTE + band are arranged with their center frequencies overlapped.
- the LTE system is operated in the 10 MHz band where the LTE DL band and the LTE + DL band overlap.
- an LTE SCH (Synchronization CHannel) and BCH are transmitted in a 10 MHz band where the LTE DL band and the LTE + DL band overlap.
- the base station uses the BCH to notifies the LTE mobile station and the LTE + mobile station of information on the LTE UL band.
- LTE + BCH + is transmitted in the LTE + DL band.
- the base station uses the BCH +, the base station notifies the LTE + mobile station of information on the LTE + UL band.
- the LTE mobile station receives the BCH transmitted in the 10 MHz band in which the LTE DL band and the LTE + DL band overlap, and acquires the position of the LTE UL band.
- the LTE + mobile station is compatible with the LTE system and has the same function as the reception function of the LTE mobile station.
- the LTE + mobile station receives a signal transmitted from the base station in the LTE DL band, using the same reception method as the LTE mobile station. That is, similarly to the LTE mobile station, the LTE + mobile station receives the BCH transmitted in the 10 MHz band in which the LTE DL band and the LTE + DL band overlap, and acquires the position of the LTE UL band. Further, the LTE + mobile station receives BCH + transmitted in the LTE + DL band, and acquires the position of the LTE + UL band from the information of the LTE + UL bandwidth included in the BCH +. A method for acquiring the position of the LTE + UL band will be described later.
- the LTE mobile station and the LTE + mobile station can be accommodated simultaneously in the DL band.
- the LTE band is arranged in a frequency band lower than the LTE + band and adjacent to the LTE + band.
- PUCCH is arrange
- the PUCCH is arranged at both ends of the LTE UL band.
- PUCCH + is arranged at both ends of the LTE + UL band, similarly to the LTE UL band.
- the LTE UL band is arranged adjacent to the lower frequency band than the LTE + UL band.
- the LTE + mobile station acquires information on the LTE UL band notified from the base station using the BCH.
- the bandwidth Fw [MHz] and the center frequency fc [MHz] of the LTE UL band are notified.
- the bandwidth Fw is selected from 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz in the base station, for example, according to the communication status of the mobile station.
- the base station notifies the total bandwidth Fw total of the bandwidth Fw of the LTE UL band and the bandwidth Fw + of the LTE + UL band using BCH +.
- the total bandwidth Fw total is selected from a plurality of candidates, for example, 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, 60 MHz, 80 MHz, and 100 Mz.
- the LTE UL band is arranged adjacent to the lower frequency band than the LTE + UL band. Therefore, the LTE + mobile station can calculate the center frequency fc + of the LTE + UL band using Equation (1).
- the base station since the base station notifies the bandwidth Fw and the center frequency fc of the LTE UL band using BCH, the base station only needs to notify only the total bandwidth Fw total using BCH +. Even without notifying the center frequency fc + of the LTE + UL band, the LTE + mobile station can acquire the center frequency fc + of the LTE + UL band allocated to the local station, using Equation (1).
- the LTE + mobile station substitutes the LTE UL band width Fw, the center frequency fc, and the total bandwidth Fw total into the formula (1), so that the LTE + UL band allocated to the local station is calculated.
- the center frequency fc + can be obtained because the LTE UL band is arranged adjacent to a lower frequency band than the LTE + UL band.
- the base station only needs to report the bandwidth Fw, the center frequency fc, and the total bandwidth Fw total of the LTE UL band, and needs to notify the bandwidth Fw + and the center frequency fc + of the LTE + UL band. Therefore, the amount of signaling for notifying the information on the LTE + UL band can be reduced.
- the LTE UL band is arranged adjacent to a frequency band lower than the LTE + UL band.
- the LTE + band is not divided by the uplink control channel (such as PUCCH) transmitted by the LTE mobile station, so that a wide band can be continuously allocated to the LTE + mobile station. It becomes possible.
- the uplink control channel such as PUCCH
- the base station notifies only the LTE bandwidth Fw, the center frequency fc of the LTE band, and the total bandwidth Fw total , so that the LTE + mobile station is allocated to itself using Equation (1).
- the center frequency fc + of the UL band for LTE + can be acquired.
- the LTE + mobile station can acquire information on the UL band allocated to itself without reporting the center frequency fc + of the LTE + UL band, and can reduce the signaling amount for band information notification. Can be reduced.
- the total bandwidth Fw total of the LTE UL bandwidth and the LTE + UL bandwidth is a plurality of candidates (1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, 60 MHz, 80 MHz). , 100 Mz), the bandwidth pattern to be prepared in advance is ten. On the other hand, when notifying the UL bandwidth for LTE +, it is necessary to prepare more patterns.
- the base station instead of the total bandwidth Fw total, may notify the central frequency fc + of the LTE + for UL bandwidth with BCH +.
- the LTE + mobile station can acquire the total bandwidth Fw total by using Expression (2).
- FIG. 3 shows a relationship among the bandwidth Fw of the LTE UL band, the center frequency fc, the bandwidth Fw + of the UL band for LTE + , the center frequency fc +, and the total bandwidth Fw total .
- FIG. 4 is a block diagram showing a configuration of the mobile station apparatus according to the present embodiment.
- the mobile station apparatus 100 of FIG. 4 is applicable to both LTE mobile stations and LTE + mobile stations.
- 4 includes a radio reception unit 101, a signal separation unit 102, a demodulation / decoding unit 103, an error determination unit 104, an ACK / NACK generation unit 105, a BCH / BCH + reception unit 106, a PDCCH (Physical Downlink Control Channel).
- the PDCCH + receiving unit 107, the band calculating unit 108, the modulation / coding unit 109, the scheduler 110, and the radio transmitting unit 111 are configured.
- the radio reception unit 101 receives a signal transmitted from the base station via the antenna, performs radio processing such as down-conversion, and outputs the received signal after radio processing to the signal separation unit 102.
- the signal separation unit 102 separates the received signal into received data, control information such as BCH and BCH +, and downlink control channels such as PDCCH and PDCCH.
- the signal separation unit 102 outputs received data to the demodulation / decoding unit 103, outputs control information such as BCH and BCH + to the BCH / BCH + receiving unit 106, and receives downlink control channels such as PDCCH and PDCCH as PDCCH / PDCCH + Output to the unit 107.
- Demodulation / decoding section 103 demodulates and decodes the received signal, and outputs the demodulated / decoded received data to error determination section 104.
- the error determination unit 104 determines whether there is an error in the received data and outputs the determination result to the ACK / NACK generation unit 105.
- the ACK / NACK generation unit 105 generates an ACK when there is no error in the received data, generates a NACK when there is an error, and outputs the generated ACK / NACK to the scheduler 110.
- the BCH / BCH + receiving unit 106 extracts information on the center frequency fc, the bandwidth Fw, and the total bandwidth Fw total of the LTE UL band from the input control information, and sends the information to the band calculation unit 108. Output.
- the PDCCH / PDCCH + receiving unit 107 receives PDCCH or PDCCH +.
- the PDCCH / PDCCH + receiving unit 107 determines the transmission position of the ACK / NACK on the PUCCH corresponding to the received CCE (Control Channel Element) number of the PDCCH, and outputs information on the determined transmission position to the scheduler 110.
- PDCCH / PDCCH + receiving section 107 determines the transmission position of ACK / NACK in PUCCH + corresponding to the received CCE + number of PDCCH +, and outputs information on the determined transmission position to scheduler 110. Note that the association between PDCCH + and PUCCH + follows the basic arrangement example described above.
- the bandwidth calculation unit 108 calculates the LTE + UL bandwidth center frequency fc + and the LTE + UL bandwidth Fw + using the equations (1) and (3), and the LTE UL bandwidth Fw, the center frequency fc. , And information on the LTE + UL band Fw + is output to the scheduler 110.
- Modulation / encoding section 109 modulates and encodes control signals such as transmission data and CQI to obtain a modulated signal, and outputs the modulated signal to scheduler 110.
- the scheduler 110 schedules the modulated signal in an appropriate frequency band. Specifically, when the LTE UL band is used, the scheduler 110 assigns the modulation signal to an appropriate frequency band of the LTE UL band using information on the bandwidth Fw and the center frequency fc of the LTE UL band. Further, when using the LTE + UL band, the scheduler 110 uses the information on the bandwidth Fw + and the center frequency fc + of the LTE + UL band to allocate the modulation signal to an appropriate frequency band of the LTE + UL band.
- the scheduler 110 separately holds the association between PDCCH and PUCCH and the association between PDCCH + and PUCCH +. Then, ACK / NACK for data reception in the LTE DL band is scheduled on the PUCCH associated with the PDCCH CCE number. Also, ACK / NACK for data reception in the LTE + DL band is scheduled to PUCCH + associated with the PDCCH + CCE + number.
- the scheduler 110 outputs the modulated signal after scheduling to the wireless transmission unit 111.
- the radio transmission unit 111 performs single carrier modulation on the modulated signal after scheduling, and transmits the single carrier signal to the base station via the antenna.
- the LTE UL band is arranged adjacent to the lower frequency band than the LTE + UL band.
- the LTE + mobile station uses the formula (1) to allocate the LTE + UL
- the center frequency fc + of the band can be acquired.
- the LTE + mobile station can notify the LTE + mobile station by notifying only the LTE UL bandwidth Fw, the LTE UL bandwidth center frequency fc, and the total bandwidth Fw total without notifying the center frequency fc + of the LTE + UL band.
- Information on the UL band allocated to the apparatus can be acquired, and the amount of signaling for notification of band information can be reduced.
- the LTE UL band in a frequency band lower than the LTE + UL band, the line quality is improved compared to the case where the LTE UL band is arranged in a frequency band higher than the LTE + UL band. Even when the mobile station is far away from the base station, good communication quality can be ensured.
- Embodiment 2 In this embodiment, an arrangement example of PUCCH + different from that in Embodiment 1 will be described.
- the LTE mobile station when the PDCCH is transmitted from the base station, the LTE mobile station transmits an ACK / NACK signal for downlink data reception to the base station using the PUCCH corresponding to the CCE number in which the PDCCH is arranged.
- the transmission position of the PDCCH is associated with the transmission position of the PUCCH that transmits ACK / NACK, and is operated according to the association rule.
- a new association rule between PDCCH + and PUCCH + is proposed, and three arrangement examples will be described below.
- two PUCCH + are referred to as a first PUCCH + and a second PUCCH +, and the first PUCCH + is described as being arranged on a lower frequency side than the second PUCCH +.
- the LTE UL band is 10 MHz and the LTE + UL band is 35 MHz will be described as an example.
- FIG. 5 shows an arrangement example 1.
- the first and second PUCCH + for LTE + are arranged inside the PUCCH for LTE.
- the first and second PUCCH + for LTE + adjacent to the LTE PUCCH and within the LTE UL band, the first and second PUCCH + in the LTE + UL band It will not be sent.
- the bandwidth that can be allocated for LTE + data transmission can be increased, and more data can be transmitted.
- the PDCCH transmitted on the LTE downlink is associated with the PUCCH transmitted on the LTE uplink, and the LTE mobile station associates with the CCE number in which the PDCCH is arranged.
- ACK / NACK is transmitted using the assigned PUCCH.
- the first PUCCH + is arranged on the low frequency side of the LTE UL band
- the second PUCCH + is arranged on the high frequency side of the LTE UL band.
- a frequency diversity effect is obtained.
- the first and second PUCCHs are arranged on the low frequency side of the LTE + UL band, the LTE + UL band is wide, and it is difficult for the LTE + mobile station to transmit in the high frequency band of the LTE + UL band. Even in the case, the LTE + mobile station can transmit the first and second PUCCH +.
- the first PUCCH + is arranged adjacent to the PUCCH on the low frequency side of the LTE UL band and outside the LTE UL band, and the second PUCCH + is arranged in the LTE + UL band. To do.
- FIG. 6A shows arrangement example 2 (a).
- the first PUCCH + is arranged outside the LTE UL band adjacent to the PUCCH.
- the second PUCCH + is arranged in the LTE + UL band adjacent to the high frequency side PUCCH.
- FIG. 6B shows arrangement example 2 (b).
- the first PUCCH + is arranged outside the LTE UL band adjacent to the PUCCH on the low frequency side. Also, the second PUCCH + is arranged at the end on the high frequency side in the LTE + UL band.
- positioning in this way, since 1st PUCCH + and 2nd PUCCH + come to be arrange
- the PUCCH + is transmitted at both ends of the LTE + UL band.
- the same rules as those in LTE can be used.
- the arrangement example 2 has been described above.
- the frequency interval between the first PUCCH + and the second PUCCH + is wider in the arrangement example 2 than in the arrangement example 1, and thus the frequency of the PUCCH + Diversity effect can be improved.
- either one of the first PUCCH + and the second PUCCH + is arranged in the LTE UL band. That is, one of the first and second PUCCH + is nested in two PUCCHs. Thereby, in the example 3 of arrangement
- 7A, 7B, 7C, and 7D show Arrangement Example 3 (a), Arrangement Example 3 (b), Arrangement Example 3 (c), and Arrangement Example 3 (d).
- FIG. 7A shows an arrangement example 3 (a).
- the first and second PUCCH + are arranged adjacent to the high frequency side of the two PUCCHs. By arranging in this way, it is not necessary to transmit PUCCH + outside the low frequency band of the LTE UL band, and a higher frequency diversity effect can be obtained as compared to arrangement example 1.
- FIG. 7B shows an arrangement example 3 (b).
- the first PUCCH + is arranged adjacent to the high frequency side of the low frequency PUCCH, and the second PUCCH + is arranged at the high frequency end of the LTE + UL band.
- the frequency interval between the two PUCCH + is further widened, so that a higher frequency diversity effect can be obtained.
- FIG. 7C shows an arrangement example 3 (c).
- the first and second PUCCH + are arranged adjacent to the low frequency side of the two PUCCHs.
- FIG. 7D shows an arrangement example 3 (d).
- the first PUCCH + is arranged adjacent to the low frequency side of the high frequency PUCCH, and the second PUCCH + is arranged at the high frequency end of the LTE + UL band.
- the frequency interval between the two PUCCH + s is widened, so that a high frequency diversity effect can be obtained.
- FIG. 8 is a block diagram showing a main configuration of the mobile station apparatus according to the present embodiment.
- the mobile station apparatus 200 of FIG. 8 includes a PDCCH / PDCCH + receiving unit 201 in place of the PDCCH / PDCCH + receiving unit 107 with respect to the mobile station apparatus 100 of FIG.
- the PDCCH / PDCCH + receiving unit 201 receives PDCCH or PDCCH +.
- the PDCCH / PDCCH + reception unit 201 determines the transmission position of the ACK / NACK in the PUCCH corresponding to the received PDCCH CCE number, and outputs information on the determined transmission position to the scheduler 110.
- PDCCH / PDCCH + receiving section 201 determines the transmission position of ACK / NACK in PUCCH + corresponding to the received CCE + number of PDCCH +, and outputs information on the determined transmission position to scheduler 110. Note that the association between PDCCH + and PUCCH + follows any of Arrangement Example 1 to Arrangement Example 3.
- arrangement examples 1 to 3 are proposed as new association rules between PDCCH + and PUCCH +.
- PAPR can be reduced when performing single carrier transmission.
- the LTE + UL band information has been described as an example using BCH +, but may be notified using control information other than BCH +.
- BCH + is arranged in the LTE + DL band.
- the present invention is not limited to this, and BCH + may be arranged in the LTE DL band.
- the LTE + mobile station may communicate only in the LTE + UL band, may communicate only in the LTE UL band, or may communicate using both the LTE + UL band and the LTE UL band. Also good.
- each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the frequency band allocation method and the transmission apparatus according to the present invention are an LTE system and an uplink frequency band allocation method for an LTE system in a mixed system in which an LTE system and an LTE + system coexist, and a transmission apparatus applied to the mixed system. Useful.
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Abstract
Description
古い通信システム:LTE(Long Term Evolution)
新しい通信システム:LTE+(「LTE Advanced」、「IMT advanced」又は「4G」とも呼ばれる)
本実施の形態では、LTE移動局とLTE+移動局とが共存する混合システムにおいて、LTE用の上り回線帯域を低い帯域に寄せて配置し、LTE+用の上り回線帯域を高い帯域に寄せて配置して運用する形態について説明する。このような配置を採ることにより、LTE移動局が送信する上り回線制御チャネル(PUCCH等)によって、LTE+用の帯域が分断されずに済むため、LTE+移動局に連続して広い帯域を割り当てることが可能となる。特に、上り回線でLTE+移動局がシングルキャリア伝送を行う場合、シングルキャリア信号に連続した帯域を割り当てることが可能となるため、PAPR(peak to average power ratio)を軽減することができる。
図2に、本実施の形態に係るDL帯域及びUL帯域におけるLTE用帯域及びLTE+用帯域の配置例を示す。なお、LTE用帯域とは、LTEシステムにおいて用いられる帯域であり、LTE+用帯域とは、LTE+システムにおいて用いられる帯域である。
図4は、本実施の形態に係る移動局装置の構成を示すブロック図である。図4の移動局装置100は、LTE移動局及びLTE+移動局の双方に適用可能である。図4の移動局装置100は、無線受信部101、信号分離部102、復調・復号部103、誤り判定部104、ACK/NACK生成部105、BCH・BCH+受信部106、PDCCH(Physical Downlink Control Channel)・PDCCH+受信部107、帯域計算部108、変調・符号化部109、スケジューラ110、及び、無線送信部111を備えて構成される。
本実施の形態では、実施の形態1と異なるPUCCH+の配置例について説明する。
図5に、配置例1を示す。
配置例2では、第1のPUCCH+を、LTE用UL帯域の低周波数側のPUCCHに隣接しつつ、かつ、LTE用UL帯域外に配置し、第2のPUCCH+を、LTE+用UL帯域内に配置する。
図6Aに配置例2(a)を示す。
図6Bに配置例2(b)を示す。
配置例3では、第1又は第2のPUCCH+のいずれか一方を、LTE用UL帯域内に配置する。すなわち、第1又は第2のPUCCH+のいずれか一方を、2つのPUCCHの入れ子とする。これにより、配置例3では、LTE用UL帯域を占有するPUCCH+の数を、配置例1よりも削減することができる。図7A、図7B、図7C及び図7Dに、配置例3(a)、配置例3(b)、配置例3(c)及び配置例3(d)を示す。
図7Aに配置例3(a)を示す。
図7Bに配置例3(b)を示す。
図7Cに配置例3(c)を示す。
図7Dに配置例3(d)を示す。
図8は、本実施の形態に係る移動局装置の要部構成を示すブロック図である。なお、図8の移動局装置200において、図4と共通する構成部分には、図4と同一の符号を付して説明を省略する。図8の移動局装置200は、図4の移動局装置100に対し、PDCCH・PDCCH+受信部107に代えて、PDCCH・PDCCH+受信部201を備える。
101 無線受信部
102 信号分離部
103 復調・復号部
104 誤り判定部
105 ACK/NACK生成部
106 BCH・BCH+受信部
107,201 PDCCH・PDCCH+受信部
108 帯域計算部
109 変調・符号化部
110 スケジューラ
111 無線送信部
Claims (12)
- 上り回線においてシングルキャリア伝送を行う端末が混在する第1の通信システムと、前記第1の通信システムの上り回線の最大帯域幅より、最大帯域幅が狭い上り回線を用いる第2の通信システムとが共存する混在システムにおいて、前記第1の通信システムの上り回線に連続した周波数帯域を割り当てる、
周波数帯域割当方法。 - 前記第1の通信システムの上り回線の周波数帯域より低く、当該周波数帯域に隣接した周波数帯域を、前記第2の通信システムの上り回線に割り当てる、
請求項1に記載の周波数帯域割当方法。 - 前記第1の通信システムは、前記第2の通信システムとの互換性を有し、
前記混在システムの上り回線の帯域幅又は前記第1の通信システムの上り回線の中心周波数を前記第1の通信システムの制御チャネルを用いて前記第1の通信システムの端末に通知し、
前記第2の通信システムの上り回線の中心周波数及び帯域幅を前記第2の通信システムの制御チャネルを用いて前記第1の通信システムの端末及び前記第2の通信システムの端末に通知する、
請求項2に記載の周波数帯域割当方法。 - 前記第1の通信システムは、LTE+であり、前記第2の通信システムは、LTEである、
請求項2に記載の周波数帯域割当方法。 - 前記LTE+用の第1及び第2のPUCCH+を、LTE用のPUCCHに隣接し、かつ、LTE用帯域内に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の低周波数側のPUCCHに隣接し、かつ、LTE用帯域外に配置し、
前記LTE+用の第2のPUCCH+を、LTE用の高周波数側のPUCCHに隣接し、かつ、LTE用帯域外に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の低周波数側のPUCCHに隣接し、かつ、LTE用帯域外に配置し、
前記LTE+用の第2のPUCCH+を、LTE+用帯域の高周波数側に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の低周波数側のPUCCHに隣接し、かつ、LTE用帯域内に配置し、
前記LTE+用の第2のPUCCH+を、LTE用の高周波数側のPUCCHに隣接し、かつ、LTE用帯域外に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の低周波数側のPUCCHに隣接し、かつ、LTE用帯域内に配置し、
前記LTE+用の第2のPUCCH+を、LTE+用帯域の高周波数側に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の低周波数側のPUCCHに隣接し、かつ、LTE用帯域外に配置し、
前記LTE+用の第2のPUCCH+を、LTE用の高周波数側のPUCCHに隣接し、かつ、LTE用帯域内に配置する、
請求項4に記載の周波数帯域割当方法。 - 前記LTE+用の第1のPUCCH+を、LTE用の高周波数側のPUCCHに隣接し、かつ、LTE用帯域内に配置し、
前記LTE+用の第2のPUCCH+を、LTE+用帯域の高周波数側に配置する、
請求項4に記載の周波数帯域割当方法。 - 上り回線においてシングルキャリア伝送を行う端末が混在する第1の通信システムと、前記第1の通信システムの上り回線の最大帯域幅より、最大帯域幅が狭い上り回線を用いる第2の通信システムとが共存する混在システムにおいて、前記第1の通信システムの上り回線に割り当てられた連続した周波数帯域の情報を取得する取得手段と、
前記第1の通信システムの上り回線に割り当てられた連続した周波数帯域でシングルキャリア伝送を行う送信手段と、
を具備する送信装置。
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