WO2005074178A1 - 送受信装置および送受信方法 - Google Patents
送受信装置および送受信方法 Download PDFInfo
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- WO2005074178A1 WO2005074178A1 PCT/JP2005/001103 JP2005001103W WO2005074178A1 WO 2005074178 A1 WO2005074178 A1 WO 2005074178A1 JP 2005001103 W JP2005001103 W JP 2005001103W WO 2005074178 A1 WO2005074178 A1 WO 2005074178A1
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Classifications
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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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
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
Definitions
- the present invention relates to a transmission / reception device and a transmission / reception method used in a communication system of an Orthogonal Frequency Division Multiple Access (OFDMA) system.
- OFDMA Orthogonal Frequency Division Multiple Access
- the base station in order to allocate a transmission packet, the base station needs to know in advance the state of the propagation path (frequency characteristics) between the base station and the mobile station at the time of scheduling. is there. Therefore, in the OFDMA-FDD (Frequency Division Duplex) system, the mobile station measures the propagation path condition in the frequency band used for the downlink and reports the measurement result to the base station on the uplink. Scheduling of transmission packets is performed based on. In addition, in the OFDMA-TDD (Time Division Duplex) system, similar to the FDD system, along with the method of reporting information on the state of the propagation path of the downlink from the mobile device, the vertical symmetry of the propagation path of the TDD system is used. A method of scheduling the downlink based on the propagation path state of the uplink is also being studied.
- OFDMA-FDD Frequency Division Duplex
- HSDPA High Speed Downlink Packet Access
- the base station transmits a signal to the mobile station based on the reported downlink reception quality information of the mobile station.
- the modulation method of the signal is determined (for example, see Patent Document 2).
- Patent Document 1 JP-A-2002-252619 (pages 5-6)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-199173 (Page 8, FIG. 5)
- Non-Patent Document 1 “MC—CDM System Using Frequency Scheduling”, IEICE Technical Report,
- the mobile station transmits some symbols such as pilots in the uplink over the entire schedulable frequency band. Therefore, there is a problem that uplink resources are consumed and system capacity is reduced. At this time, the power consumption of the mobile device also increases.
- Patent Document 2 discloses that the base station notifies the base station of an advance notice of data transmission for the purpose of increasing the uplink throughput, reducing the power consumption of the mobile station, and the like. There is disclosed a mobile station that starts transmitting information about the mobile station and stops transmitting information when a notification of the end of data transmission is received from a base station. However, since the base station needs to notify the mobile station of the advance notice of data transmission, there is a problem that the resources of the downlink are consumed and the system capacity is also reduced.
- an object of the present invention is to provide a transmitting / receiving apparatus and a transmitting / receiving method capable of preventing a decrease in system capacity, improving a system throughput, and suppressing power consumption.
- the receiving apparatus of the present invention determines a state of a propagation path through which a received multicarrier signal has passed, and according to a result of the determination, a state of a propagation path from a used frequency band of the received multicarrier signal.
- a configuration is provided that includes a specifying unit that specifies an area of a predetermined level or higher, and a notifying unit that notifies the transmitting apparatus of area information indicating the specified area.
- the power consumption of the transmitting / receiving device can be suppressed.
- FIG. 1 is a block diagram showing a main configuration of a mobile station according to Embodiment 1.
- FIG. 2A is a diagram showing subbands selected by a channel determination unit according to Embodiment 1 together with channel states of downlinks.
- FIG. 2B is a diagram showing the subbands selected by the channel determination unit according to Embodiment 1 together with the channel state of the downlink.
- FIG. 3A Signal configuration diagram showing the relationship between subbands and subcarrier signals
- FIG. 3B Signal configuration diagram showing the relationship between subbands and subcarrier signals
- FIG. 4 is a diagram showing the configuration of a subcarrier signal in one subband in more detail
- FIG. 5 is a block diagram showing a detailed internal configuration of a frequency selection unit according to Embodiment 1.
- FIG. 6 is a diagram showing a signal sequence of the communication system according to the first embodiment.
- FIG. 7 is a block diagram showing a main configuration of a base station apparatus according to Embodiment 1.
- FIG. 8 is a diagram showing a configuration of a multicarrier signal transmitted from a base station apparatus together with a configuration of a multicarrier signal to be received.
- FIG. 9 is a block diagram showing an internal configuration of a user selection unit according to Embodiment 1.
- FIG. 10 is a block diagram showing an internal configuration of a frequency selection unit according to Embodiment 1.
- FIG. 11 A signal configuration showing another variation of the relationship between subbands and subcarrier signals
- FIG. 12 is a diagram showing frequency characteristics of reception quality of a base station apparatus.
- FIG. 13 is a block diagram showing a main configuration of a mobile device according to a second embodiment.
- FIG. 14A A diagram showing subbands to which priorities have been added together with the state of propagation paths in the downlink.
- FIG. 14B is a diagram showing the subbands to which priorities are added together with the state of the propagation path in the downlink.
- FIG. 15 is a diagram showing an example of a pilot pattern selected by a pilot selection unit according to the second embodiment.
- FIG. 16 is a block diagram showing an internal configuration of a frequency selection unit according to Embodiment 2.
- FIG. 17 is a block diagram showing an internal configuration of a user selection unit according to Embodiment 2.
- FIG. 18 is a block diagram showing an internal configuration of a frequency selection unit according to Embodiment 2.
- FIG. 19 A flowchart showing the procedure of the conflict resolution processing
- FIG. 20 is a diagram showing a specific example of subband allocation
- FIG. 21 is a block diagram showing main components of a mobile device according to Embodiment 3.
- FIG. 22 is a flowchart showing a procedure of a circuit stop process of a movement determination unit and a data type determination unit according to Embodiment 3.
- FIG. 23 is a diagram illustrating an overview of a transmission / reception method according to Embodiment 4.
- FIG. 24 is a block diagram schematically showing a mobile device according to a fourth embodiment.
- FIG. 25 is a block diagram schematically showing a base station apparatus according to Embodiment 4.
- FIG. 26 is a block diagram showing a main configuration inside an OFDMA transmitting section of a mobile station according to Embodiment 4.
- FIG. 27 A block diagram showing a main configuration inside an OFDMA receiving section of a mobile station according to Embodiment 4.
- FIG. 28 is a block diagram showing a main configuration inside an OFDMA transmitting section of a base station apparatus according to Embodiment 4.
- FIG. 29 is a block diagram showing a main configuration inside an OFDMA receiving section of a base station apparatus according to Embodiment 4.
- a base station device and a mobile station in an OFDMA-TDD mobile communication system will be described as examples of the transmission / reception device. Also, this communication system is assumed to be performing automatic retransmission control (ARQ: Automatic Repeat reQuest).
- ARQ Automatic Repeat reQuest
- FIG. 1 is a block diagram showing a main configuration of mobile device 100 according to Embodiment 1 of the present invention.
- the mobile device 100 includes a transmission unit 110 and a reception unit 120.
- transmitting section 110 includes pilot selecting section 111, modulating section 112, frequency selecting section 113, IFFT section 114, GI adding section 115, RF section 116, and transmitting antenna 117.
- receiving section 120 includes receiving antenna 121, RF section 122, GI deleting section 123, FFT section 124, separating / selecting section 125, channel estimating section 126, channel compensating section 127, demodulating section 128, decoding section 129, an error detection unit 130, and a propagation path determination unit 131.
- Each unit of the mobile device 100 performs the following operation.
- RF section 122 performs predetermined radio reception processing such as down-conversion on the downlink multicarrier signal received via reception antenna 121.
- the GI removing section 123 removes a guard interval (GI) from the wirelessly processed multicarrier signal.
- FFT section 124 performs a fast Fourier transform (FFT) on the multicarrier signal after GI removal to obtain N signals.
- the separation / selection section 125 separates a pilot signal and a data signal from the N signals, selects data addressed to itself from the data signal, outputs a pilot signal to the channel estimation section 126, and performs channel compensation. Outputs a data signal addressed to own device to unit 127.
- the propagation path estimation unit 126 estimates the propagation path fluctuations of the received signal on the propagation path for the entire frequency band of OFDM from the pilot signal multiplexed on the received signal, and obtains the obtained channel estimation value and the like.
- the channel estimation information is output to channel compensation unit 127 and channel decision unit 131.
- the channel compensation unit 127 performs channel compensation of the received signal output from the separation / selection unit 125 using the channel estimation value.
- Demodulation section 128 performs demodulation processing on the received signal after propagation path compensation.
- Decoding section 129 decodes the demodulated signal to obtain received data.
- Error detection section 130 performs error detection on the received data, and outputs ACK / NACK information to pilot selection section 111 in order to feed back the detection result to the base station apparatus. Power.
- Propagation path determination section 131 uses the channel estimation value output from propagation path estimation section 126 to determine the state of the propagation path, and outputs the determination result to frequency selection section 113 of transmitting section 110.
- pilot selecting section 111 outputs error detection section 130 output from receiving section 120 out of a plurality of types of pilot signal patterns (pilot patterns) stored in advance. A pattern corresponding to the / NACK information is selected, and a pilot signal composed of this pattern is generated.
- Modulating section 112 performs modulation processing on the pilot signal.
- Frequency selection section 113 selects a frequency band used by the transmission signal according to the determination result of propagation path determination section 131 of reception section 120, and maps the transmission signal to a subcarrier in each frequency band.
- IFFT section 114 performs an inverse fast Fourier transform (IFFT) on a transmission signal assigned to each frequency band to generate a multicarrier signal.
- GI adding section 115 adds GI to the obtained multicarrier signal.
- RF section 116 performs predetermined wireless transmission processing such as up-conversion on the transmission multicarrier signal after the GI addition, and wirelessly transmits via transmission antenna 117.
- a feature of mobile device 100 having the above configuration is, in particular, the operation of propagation path determination section 131 in reception section 120 and frequency selection section 113 in transmission section 110. Each is described in detail below.
- propagation path determining section 131 Based on propagation path estimation information such as a channel estimation value calculated by propagation path estimating section 126, propagation path determining section 131 performs propagation path conditions over the entire frequency band used by the received multicarrier signal, that is, Judge the propagation path condition in the entire frequency band of OFDM. Then, a frequency region where the state of the medium propagation path in the frequency band used by OFDM is the best is specified.
- a frequency band (band) used in OFDM is divided into a plurality of frequency bands (subbands) each having a smaller predetermined frequency width, and each subband can be distinguished from each other.
- Information for example, identification number
- Propagation path determination section 131 compares the propagation path states of the subbands and selects the subband having the best propagation path state (one in this embodiment), thereby obtaining a frequency having a good propagation path state.
- FIG. 2A and FIG. 2B are diagrams showing the subbands selected by propagation path determination section 131 together with the state of the propagation path in the downlink.
- FIG. 2A shows a case of a certain user # 1
- FIG. 2B shows a case of a certain user # 2.
- the propagation path state is indicated by the reception level of the reception signal of the mobile station, which is different from the channel estimation value for easy understanding.
- propagation path state (reception level) of the multicarrier signal received by mobile device 100 owned by user # 1 and user # 2 is affected by frequency selective fading and the like. , And varies greatly depending on the frequency. Therefore, propagation path determination section 131 compares the propagation path state for each subband and selects the subband with the best propagation path state. In the illustrated example, the subband of the frequency band f8 f9 is selected for the user # 1, and the subband of the frequency band f7 f8 is selected for the user # 2. If the base station apparatus performs downlink communication to each user (the mobile device 100 owned by the user) via these subbands, the base station apparatus is not significantly affected by frequency selective fading or the like. It is expected that the reception condition on the user side, which is small, will be improved. When the determination is completed, the channel determination unit 131 notifies the frequency selection unit 113 of the transmission unit 110 of the determination result (subband selection information).
- Frequency notifying section 113 transmits a specific notification signal via the sub-band selected by propagation path determining section 131 to notify the base station apparatus of the sub-band selection information obtained from propagation path determining section 131. Do the sending.
- the base station apparatus receives the notification signal transmitted from each mobile device, and recognizes the subband used for the notification signal, thereby ascertaining a subband having a good propagation path state for each mobile device.
- frequency selecting section 113 uses an ACK / NACK signal as the notification signal. That is, the ACK / NACK signal has two roles: one to notify the base station device whether retransmission is necessary in automatic retransmission control and the other to notify the base station device of a subband with a good propagation path condition. . In the present embodiment, only one subband having the best propagation path state is notified to the base station apparatus, and thus only one notification signal is required. Therefore, similarly, the selected subband can be notified by an ACK / NACK signal transmitted only once.
- FIGS. 3A and 3B are signal configuration diagrams showing the relationship between subbands and subcarrier signals. is there. Here, the case where the number of users is 2 is shown, FIG. 3A is a signal configuration diagram of user # 1, and FIG. 3B is a signal configuration diagram of user # 2.
- each subband has a predetermined frequency width, and a plurality of subcarriers can be arranged therein (four subcarriers in the illustrated example).
- FIG. 3A shows a state where user # 1 has selected subband # 2.
- user # 1 is a subcarrier in subband # 2 (here, subcarrier number
- the ACK / NACK signal is transmitted by a plurality of subcarriers (for example, in FIG. 3A, subcarriers # 4 and # 6).
- the base station apparatus can determine ACK / NACK by combining a plurality of ACKZNACK signals transmitted from each mobile station. As a result, ACK / NACK determination can be performed with high accuracy.
- the ACK / NACK signal is identified by a pilot pattern of a pilot (known) signal. That is, different pilot patterns are used for the ACK signal and the NACK signal, so that the base station apparatus can identify ACK / NACK.
- FIG. 4 is a diagram showing the configuration of a subcarrier signal in one subband in more detail.
- the upper part of FIG. 4 shows the case of user # 1
- the middle part of FIG. 4 shows the case of user # 2
- the lower part of FIG. 4 shows the case of user # 3.
- each subcarrier is fixedly assigned to each user. Specifically, subcarriers of subcarrier numbers # 0, # 3, and # 6 are always allocated to user # 1 (see the upper row in Fig. 4), and subcarriers of subcarrier numbers # 2 and # 5 are allocated to user # 2. Carriers are always allocated (see the middle part of Fig. 4), and subcarriers with subcarrier numbers # 1 and # 4 are always assigned to user # 3 (see the lower part of Fig. 4).
- the base station apparatus knows in advance how to allocate each subcarrier to each user, the base station apparatus only needs to investigate the usage status of each subcarrier to obtain two pieces of information, that is, It is possible to recognize which user has sent the notification signal and which subband the user has selected.
- the mobile device 100 transmits this data following the ACKZNACK signal also serving as the notification signal.
- the pilot sequence power of the ACK / NACK signal can also serve as a pilot for transmission data. This enables more efficient data transmission.
- FIG. 5 is a block diagram showing a detailed internal configuration of frequency selection section 113.
- Frequency selection section 113 includes a switch 107 for switching a used subband, an SZP conversion section 108 (108-1, 108-2,..., 108_n), and a switch 109 for switching a used subcarrier. (109-1, 109-2, ..., 109-n).
- Switch 107 selects a sub-band to be used by the ACK / NACK signal based on the determination result (sub-band information) of propagation path determination section 131. Specifically, the ACK / NACK signal output from modulation section 112 is switched to an output terminal corresponding to the selected subband and output.
- S / P converters 108 are provided corresponding to the respective sidebands, and perform S / P conversion on the ACK / NACK signal for each subband output from switch 107 to perform multiple subbands.
- the signal is divided into carrier signals and output to the respective switches 109 provided corresponding to the respective S / P converters 108.
- Switch 109 selects a subcarrier uniquely assigned to each user in each subband. Specifically, the ACK / NACK signal output from SZP conversion section 108 is switched to an output terminal corresponding to the selected subcarrier and output. The ACK / NACK signal output from each output terminal is input to IFFT section 114.
- mobile device 100 according to the present embodiment has been described. Next, a communication system including the mobile device 100 and the base station device 150 accommodating the mobile device 100 will be described.
- FIG. 6 is a diagram showing a signal sequence of the communication system according to the present embodiment.
- Base station apparatus 150 transmits data to mobile station 100 (ST1010).
- the mobile station 100 receives this signal, and as described above, estimates the propagation path fluctuation and determines the state of the propagation path (ST1020). Then, a subband having a good propagation path condition is selected (ST1030), and an ACKZNACK signal is transmitted (ST1040) using this subband, thereby notifying base station device 150 of the selected subband.
- the base station apparatus 150 determines the subband to be assigned to each mobile station based on the subband information notified from each mobile station by the ACKZNACK signal, performs scheduling in the time axis direction, and performs the final transmission schedule.
- Mobile station 100 performs predetermined radio reception processing on the data that has been frequency-scheduled and transmitted from base station apparatus 150, and obtains data addressed to itself (ST1070). Note that the radio reception processing of mobile device 100 is performed only for the subbands notified to base station apparatus 150 in advance (performed over the entire range of the notified subbands).
- this communication system is a system in which the uplink and the downlink are asymmetric (the number of subcarriers is different between the upper and lower channels).
- PAPR Peak Average Power Ratio
- base station apparatus 150 cannot make the above-described channel determination until some signal is received from base station apparatus 150. Therefore, base station apparatus 150 periodically transmits dummy signals and pilot signals. Alternatively, it is assumed that each mobile station is transmitting a synchronization signal necessary for establishing communication with the base station apparatus 150. Then, even when data is transmitted from mobile device 100 first, mobile device 100 can perform the above-described channel determination. It should be noted that base station apparatus 150 does not transmit a dummy signal, and base station apparatus 150 may perform initial data transmission using a predetermined subband.
- base station apparatus 150 according to the present embodiment will be described.
- FIG. 7 is a block diagram showing a main configuration of base station apparatus 150.
- Base station apparatus 150 includes transmitting section 160 and receiving section 170.
- transmitting section 160 includes a buffer 161 (161-1, 161-2), a coding section B162 (162_1, 162-2), a modulation section 163 (163-1, 163-1), and a frequency selecting section 164.
- receiving section 170 includes receiving antenna 171, RF section 172, GI deleting section 173, FFT section 174, user selecting section 175, and determining section 176 (176-1, 176-2).
- Each unit of base station apparatus 150 performs the following operation.
- RF section 172 performs a predetermined radio reception process such as down-conversion on the multicarrier signal radio-received via reception antenna 171.
- GI deletion section 173 deletes GI from the received multicarrier signal.
- FFT section 174 performs a fast Fourier transform on the received multicarrier signal after the GI deletion to obtain N signals.
- the user selection section 175 selects the signal output from the FFT section 174 for each user, and recognizes the used frequency band (used subband) by determining whether or not this signal includes the ACKZNACK signal. And outputs the used subband information.
- the determination unit 176 performs correlation calculation or pattern matching on the received signal using a predetermined pilot pattern, determines whether or not data retransmission is necessary for each user, and sends the determination result to the buffer 161 of the transmission unit 160. Output.
- buffer 161 temporarily stores data # 1 and data # 2 to be transmitted, and outputs these data to encoding section 162 immediately at the time of initial transmission, and also includes receiving section 170.
- the encoding unit 162 performs a predetermined encoding on the transmission data temporarily stored in the buffer 161.
- Modulation section 163 performs predetermined modulation processing on the encoded data.
- Frequency selection section 164 selects a frequency band used by the transmission multicarrier signal according to the user selection information notified from user selection section 175 of reception section 170, and allocates a transmission signal to each frequency band.
- Multiplexing section 165 multiplexes the modulated pilot output from modulating section 159 with the transmission signal assigned to each frequency band.
- IFFT section 166 performs inverse fast Fourier transform on the multiplexed signal.
- GI adding section 167 adds GI to the signal after the inverse fast Fourier transform.
- the RF section 168 up-converts the GI-added signal. Perform predetermined radio transmission processing such as inversion, and perform radio transmission via the transmission antenna 169.
- FIG. 8 is a diagram showing a configuration of a multicarrier signal transmitted from base station apparatus 150 together with a configuration of a multicarrier signal received by base station apparatus 150. That is, this figure shows the relationship between multicarrier signals on both the uplink and the downlink.
- uplink and downlink signals are multiplexed in the time axis direction (the base station apparatus and the mobile station are configured to receive uplink signals).
- the line signal and the downlink signal are transmitted in time division with each other.
- signals addressed to a plurality of users are multiplexed in the frequency axis direction (ie, orthogonal to each other on the frequency axis).
- the data addressed to each user is mapped to the subcarrier that has been assigned).
- Base station apparatus 150 transmits data addressed to this user via the sub-band having a good propagation path condition notified from mobile device 100. That is, as shown in the figure, the uplink signal of each user and the corresponding downlink signal use the same frequency band (sub-band).
- base station apparatus 150 may transmit a downlink multicarrier signal after a lapse of a predetermined time after receiving an uplink multicarrier signal.
- FIGS. 9 and 10 are block diagrams showing the internal configurations of the user selection unit 175 in the reception unit 170 and the frequency selection unit 164 in the transmission unit 160 that realize the above operation.
- the user selection unit 175 in FIG. 9 includes a switch 181 (181-1, 181-2, ⁇ , 181_n) and a P / S conversion unit 182 (182-1, 182-2, ⁇ , 182_2n). ), And a detection unit 183 (183-1, 183-2) existing for each user.
- Switch 181 separates each subcarrier signal separated by FFT section 174 into a signal for each user. Specifically, since base station apparatus 150 knows in advance the subcarriers that may be allocated to each user, base station apparatus 150 assigns each subcarrier signal to each user. Are combined (selected), and this signal is connected to each P / S conversion section 182 installed for each user. For example, the switch 181-1 combines the subcarrier signals destined for user # 1 into the P / S conversion section 182-1 and the subcarrier signals destined for user # 2 collectively into the P / S conversion section 182-2. Switch and output.
- P / S conversion section 182 performs P / S conversion on the signals output collectively for each user from switch 181 to generate a series of signals, and outputs the signals to detection section 183.
- a plurality of PZS conversion units 182 exist for one user, but a signal for user # 1 is output to detection unit 183-1 and a signal for user # 2 is output to detection unit 183-2.
- Detecting section 183 detects an ACK / NACK signal included in each subband for each user, and detects a subband actually used for transmitting the ACK / NACK signal. Then, it outputs the ACK / NACK signal to determination section 176 and outputs the subband detection result (the used subband position information) to frequency selection section 164 of transmitting section 160.
- determination section 176 determines whether the received signal is an ACK signal or a NACK signal by correlation calculation, pattern matching, or the like.
- the frequency selection unit 164 in Fig. 10 includes a switch 151 (151-1, 151-2), an adjustment unit 152, and an S / P conversion unit 153 (153-1, 153-2, ..., 153_n). Having.
- Switch 151 switches the modulated signal addressed to each user output from modulating section 163 in accordance with the used subband information from user selecting section 175, and connects to an appropriate subband.
- Adjustment section 152 basically has a force S for outputting data addressed to each user to the selected sub-band through each switch, and when the same sub-band has a plurality of users' wishes overlapping with each other. And make adjustments to avoid duplication. It should be noted that this adjustment process is described in the second embodiment in the case where a more complicated adjustment is required, and will not be described here.
- SZP conversion section 153 performs S / P conversion to convert the signal output from adjustment section 152 to multicarrier, and outputs the result to multiplexing section 165.
- the base station device 150 has been described above.
- propagation path determination section 131 of mobile device 100 determines whether the state of the propagation path through which the received multicarrier signal has passed. Specifically, the frequency band used in OFDM is divided into a plurality of frequency bands (sub-bands) having a predetermined frequency width known to both the transmitting side and the receiving side. Then, a subband whose propagation path condition is equal to or higher than a predetermined level is selected from frequency bands used by OFDM. Then, mobile station 100 notifies base station apparatus 150 on the transmitting side only of the subband selected by propagation path determination section 131.
- the signal necessary for notification of the frequency domain having a good propagation path condition is only information for identifying some selected subbands, so that the data amount can be reduced and the throughput of the communication system can be reduced. Can be improved.
- the power consumption of mobile device 100 can be reduced. This feature is not limited to automatic retransmission control.
- each subband has a frequency width equal to or greater than a predetermined value such that a plurality of subcarriers can be arranged in one subband.
- the frequency width is equal to or less than a predetermined value based on the characteristics of frequency selective fading so that fading can be approximated to be substantially uniform within one subband. Therefore, the reception performance of the receiving side is improved regardless of which subcarrier is used to transmit data in the subband whose propagation path condition is determined to be good. Note that this feature is not limited to automatic retransmission control.
- frequency selection section 113 of mobile device 100 selects a notification signal by propagation path determination section 131. Over the subband. Therefore, base station apparatus 150 can recognize a frequency region having a good propagation path state only by checking the subband used by mobile station 100 (without performing processing such as decoding on the notification signal). . In addition, since processing such as decoding is not performed, no processing delay occurs. This feature is not limited to automatic retransmission control.
- propagation path determination section 131 of mobile device 100 sets the above notification signal as an ACK / NACK signal in automatic retransmission control. Since the ACKZNACK signal is originally an essential signal for automatic retransmission control, this signal is also used as the above notification signal. By doing so, it is possible to further reduce the amount of uplink data.
- ACK and NACK are identified by using different pilot patterns for ACK / NACK signals transmitted from mobile station 100.
- Automatic retransmission control is an indispensable technique for enabling high-quality packet communication with few reception errors.
- high quality is required for the ACKZNACK signal transmitted on the reverse link so that unnecessary retransmissions do not occur.
- the determination unit 176 of the base station apparatus 150 can perform the ACK / NACK determination process by means of correlation processing of a pilot pattern, pattern matching, and the like. That is, it does not require demodulation processing and decoding processing such as error correction. Therefore, the processing delay can be reduced, and the throughput of the communication system can be improved. Also, the circuit scale of base station apparatus 150 is reduced.
- propagation path determination section 131 selects one subband with the best propagation path state from among the used frequency bands of OFDM, an example has been described.
- a frequency region (range) where the road condition is equal to or higher than a predetermined level may be specified. That is, at this time, propagation path determination section 131 notifies base station apparatus 150 of a plurality of subbands whose propagation path state is at or above a predetermined level. Then, base station apparatus 150 selects a subband that is actually used for mobile station 100 from the plurality of notified subbands.
- reception quality such as SNR (Signal-to-Noise Ratio) and SIR (Signal-to-Interference Ratio) may be used.
- the mobile station 100 when mobile station 100 receives data transmitted by being frequency-scheduled from base station apparatus 150, the mobile station 100 performs radio reception processing only on subbands notified in advance.
- the base station apparatus 150 may notify the downlink subband actually allocated to the mobile station by an individual channel for each user before data transmission.
- mobile station 100 can further reduce the number of subbands to be targeted by performing radio reception processing only on subbands notified from base station apparatus 150. Therefore, processing delay can be reduced, and power consumption can be reduced.
- the individual channel may use a subcarrier preset for each user.
- the subcarriers are individual for the user, the signals are orthogonal to each other between the users, and the users can be reliably multiplexed.
- contention occurs in the assignment of the downlink
- the base station 150 notifies the mobile device 100 via the control channel of the finally allocated subband by resolving this contention, The throughput of the mobile device 100 is reduced.
- This method is particularly effective when the communication system according to the present embodiment is applied to an existing system (for example, a third-generation mobile communication system).
- a TDD communication system is taken as an example, so that the same frequency band is used for the uplink and the downlink, and the sub-band having a good propagation path state in the downlink is used.
- the selected sub-band can be notified to the base station apparatus.
- the present invention can be applied if the correspondence between subbands and downlink subbands is set in advance. That is, the selected subband is notified to the base station apparatus by transmitting a notification signal through the uplink subband corresponding to this subband to the subband having a good channel state in the downlink.
- FIG. 11 is a signal configuration diagram showing another variation of the relationship between subbands and subcarrier signals.
- the signal diagram on the lower side of FIG. 11 is a diagram in which each subcarrier signal shown on the upper side of FIG. 11 is divided for each subband in order to make it easier to grasp.
- SB is an abbreviation for subband.
- a plurality of subcarriers separated by a predetermined frequency are grouped into one subband. More specifically, sub-bands # 1 by subcarriers # 1, # 4, and # 7, subbands # 2 by subcarriers # 2, # 5, and # 8, and subcarriers # 3, # 6, and # 9 Subband # 3 has been formed. Then, for example, mobile station 100 obtains the average value of the received power of each subcarrier included in subband # 1, and compares this with the average value similarly obtained in the other subbands, thereby obtaining the propagation path. Select a good sub-band. By adopting such a signal configuration, it is possible to specify a frequency region with a good propagation path condition and perform frequency scheduling in a propagation path environment that exhibits periodic fading characteristics on the frequency axis.
- the ACKZNACK signal is a pilot pattern of a pilot signal.
- the ACK / NACK may be identified by the transmission power of the power ACK / NACK signal described by taking the case of identification by an example as an example.
- the case where the ACK / NACK signal is distinguished by the pilot pattern of the pilot signal as an example may be used, and the form in which the ACK / NACK signal is distinguished by another method may be used.
- a data generation unit is installed instead of the pilot selection unit 111, ACK / NACK is allocated to each OZl, and the data is modulated and transmitted by a modulation method with strong error resilience such as BPSK (Binary Phase Shift Keying). Also good ,.
- BPSK Binary Phase Shift Keying
- the transmitting side transmits data using subbands with good propagation path conditions, so that the receiving performance of the receiving side is improved. Therefore, for example, in a communication system such as the HSD PA system in which the receiving side requests the transmission side for an MCS (Modulation and Coding Scheme) of the transmission signal, the transmission rate is higher (the error tolerance is lower). Les,) MCS can be selected.
- MCS Modulation and Coding Scheme
- the pilot symbols of the ACK / NACK signal may be repeated.
- the receiving performance of the receiving side can be improved.
- this makes it possible to improve the reliability of the ACK / NACK signal, thereby improving the throughput of the communication system.
- the number of repeats is set by the base station apparatus according to the number of users, and is instructed to the mobile station.
- the repeatability of the pilot symbol may be transmitted via a plurality of subbands. As a result, it is possible to notify a plurality of transmitting bands of subbands having good propagation path conditions.
- signals addressed to a plurality of users may be multiplexed by a method such as code multiplexing.
- a method such as code multiplexing.
- FIG. 12 is a diagram illustrating frequency characteristics of reception quality (here, SIR) in the base station apparatus. As shown in this figure, when the OFDM scheme is applied to the uplink, the received SIR of the base station equipment is calculated based on the ICI (
- FIG. 13 is a block diagram showing a main configuration of mobile device 200 according to Embodiment 2 of the present invention.
- Mobile device 200 has the same basic configuration as mobile device 100 shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof will be omitted.
- a feature of mobile device 200 according to the present embodiment is that propagation path determination section 231 of reception section 220 adds priorities in order from subbands having good propagation path states, and this priority information Is output to both pilot selecting section 211 and frequency selecting section 213 of transmitting section 210. Pilot selection section 211 and frequency selection section 213 notify the above information to the base station apparatus by a predetermined method.
- channel estimating section 126 calculates channel estimation values and the like for the entire frequency band of OFDM used in the downlink to obtain channel fluctuation information. Based on this information, the propagation path determination unit 231 adds priorities to the subbands in order from the one with the better propagation path state (or higher reception level or higher SNR). The priority is determined up to a predetermined number (order). Then, the sub band information including this priority is notified to pilot selecting section 211 and frequency selecting section 213.
- FIGS. 14A and 14B are diagrams showing the sub-bands to which the priority is added by the propagation path determination unit 231 together with the state of the propagation path of the downlink.
- FIG. 14A shows the case of a certain user # 1
- FIG. 14B shows the case of a certain user # 2.
- the propagation path state is indicated by the reception level of the reception signal of the mobile station, not by the channel estimation value for easy understanding.
- the subband of frequency band f8—f9 since the subband of frequency band f8—f9 has the highest reception level, this subband is selected first, and the first priority is given. It is added.
- this sub-band is selected and the second priority is added. If it is up to the predetermined priority, the priority addition process is completed. The same applies to the case of user # 2 shown in FIG. 14B, where the subbands are prioritized in the order of frequency bands f7-f8, f6 and f7.
- pilot selection units 211 There are a plurality of pilot selection units 211 according to both the ACKZNACK information output from error detection unit 130 and the subband information of each user to which the priority is added, output from transmission path determination unit 231. Select the corresponding specific pilot pattern from the pilot patterns. In other words, information about the priority is added to the ACKZNACK signal to be transmitted by using a plurality of types of pilot patterns.
- FIG. 15 is a diagram showing an example of a pilot pattern selected by pilot selection section 211.
- the pilot signal has a 2-bit pilot pattern strength.
- the first bit is a bit for identifying an ACK / NACK signal, and the next bit is a bit for indicating a priority. Has become.
- this pilot pattern both ACK / NACK information and priority information can be indicated. Note that this figure shows an example in which the predetermined priority order is up to second.
- FIG. 16 is a block diagram showing an internal configuration of frequency selection section 213 that realizes the above operation.
- This frequency selecting section 213 has the same basic configuration as frequency selecting section 113 shown in FIG. 5, except that a plurality of ACKZNACK signals are input to switch 207 from modulation section 212. That is. A priority is added to each of the plurality of ACKZNACK signals input from the modulation unit 212, but the frequency selection unit 213 does not consider the priority and simply switches to the output terminal of the corresponding subband and outputs each signal. Connect.
- base station apparatus 250 that receives a multicarrier signal transmitted from mobile device 200 will be described. [0098] Since the basic configuration of base station apparatus 250 is the same as that of base station apparatus 150 shown in FIG. 7 of Embodiment 1, description of the basic configuration will be omitted.
- FIG. 17 is a block diagram showing an internal configuration of user selection section 175a in base station apparatus 250. Note that the basic configuration of the user selection unit 175a is the same as that of the user selection unit 175 shown in FIG. 9, and therefore only the differences will be described.
- Detecting section 283 (283-1, 283-2) detects a plurality of subbands used by mobile device 200, outputs an ACKZNACK signal received in each subband to determining section 176, and , And outputs the position information of these subbands to frequency selection section 164a. At this time, since the priority information is also added to the ACK / NACK signal, the detection unit 283 further extracts the priority information by correlation calculation, pattern matching, and the like, and outputs this information to the frequency selection unit 164a. I do.
- FIG. 18 is a block diagram showing an internal configuration of frequency selection section 164a in base station apparatus 250. Note that the basic configuration of the frequency selection unit 164a is the same as that of the frequency selection unit 164 shown in FIG. 10, and therefore only the differences will be described.
- Adjusting section 255 determines which sub-band the modulated signal destined for each user is assigned to in accordance with the method described below, based on the position information and priority information of each user's sub-band output from user selecting section 175a.
- the allocation information is determined while adjusting, and the allocation information is output to the switch 151.
- Switch 151 switches the modulation signal output from modulation section 163 addressed to each user based on subband allocation information for each user output from adjustment section 255, and outputs the signal to switch 256.
- Switch 256 connects the data destined for each user via switch 151 to the appropriate subband.
- Adjustment section 255 first determines whether or not the subband of the first priority of each user is competing with another user. If a user's priority 1 sub-band competes with another user's priority 1 sub-band, the following procedure is used to resolve the conflict between these users. .
- FIG. 19 is a flowchart showing the procedure of the conflict resolution processing. Note that, for the sake of simplicity, the above-mentioned conflict has occurred between user # 1 and user # 2. Let's do it.
- user # 1 is abbreviated as U1
- user # 2 is abbreviated as U2
- subband with the first priority is abbreviated as SB1
- subband with the second priority is abbreviated as SB2.
- Adjustment section 255 first determines whether or not a conflicting relationship with another user (the second priority subband of user # 1) has occurred in the second priority subband of user # 1 (ST2010). If there is no conflict, it is checked whether the subband with the second priority has already been used (assigned) by another user (ST2020). If already used by another user, the subband of priority 1 is assigned to user # 1, and the subhand of priority 2 is assigned to user # 2 (ST2030). In ST2020, if the priority # 2 subband of user # 1 is not yet used, assign the priority # 2 subband to user # 1, and assign user # 2 to user # 2. Assigns the first priority subhand (ST2040). Also, in ST2010, if there is a conflict with the subband of priority # 2 for user # 1, the subband with priority # 1 is assigned to user # 1 and the For # 2, the second priority sub-hand is harmed (ST2050).
- adjustment section 255 determines that when a conflict occurs in subband of priority n, subband of priority n + 1 of each competing user Next, it is confirmed whether there is any inconvenience such that the subband (priority n + 1) cannot be assigned to the user. If there is an inconvenience in one of the users, the subband having the priority n + 1 is assigned to the subband having the nth priority in preference to the user having the inconvenience. The reason for adopting this procedure is described below.
- FIG. 20 is a diagram showing a specific example of subband allocation performed according to the above flow.
- the subband “7” with the highest priority of user # 2 is competing with other users.
- User # 2 is assigned subband "7" as is.
- the subband “7” having the second priority of the user # 1 is deleted from the priority list of the user # 1, because the use of the subband “7” has already been determined by the user # 2.
- the subband assigned to # 1 becomes the third priority subband for user # 1, which is an undesirable situation. According to the above allocation method, such an allocation situation can be avoided. This is the reason for performing the above allocation method.
- Adjustment section 255 in base station apparatus 250 can adjust subband allocation by the above method.
- Mobile device 200 performs reception processing on all of the subbands notified with the priority added, and demodulates only data addressed to itself. By this means, even when contention occurs on the downlink, data addressed to itself can be received without being notified of allocation information from base station apparatus 250.
- the mobile station assigns priorities to a plurality of subbands having favorable propagation path states in the downlink and notifies the base station apparatus of the number of subbands.
- the device can perform frequency scheduling considering the situation of multiple users (with adjustment among multiple users). Therefore, the throughput of the communication system can be improved.
- the path determination unit 231 may first select a plurality of subbands whose propagation path state is at or above a predetermined level, and then add a priority to all of these subbands. This method can also reduce the amount of uplink data.
- mobile station 200 notifies priority information to the base station apparatus by discriminating it based on pilot pattern differences.
- mobile station 200 performs ACK / NACK It is good to distinguish each other by transmitting the signal transmission power with a difference.
- the pilot pattern of a plurality of pilot signals to be transmitted can be made the same, symbol combination can be performed on the base station apparatus side, and the reliability of the ACK / NACK signal can be improved. Therefore, when a plurality of mobile stations select the same subband, high-quality communication can be compensated for the plurality of mobile stations by allocating downlink subbands based on the priority order. The throughput of the system can be improved.
- mobile device 200 may transmit the ACK / NACK signal with the same transmission power.
- the mobile station does not notify the base station apparatus of the priority information, but the base station apparatus compares the reception levels of a plurality of ACK / NACK signals transmitted from the mobile station and determines that the reception level is higher. Power You can prioritize.
- the propagation path state of the subband selected based on the propagation path state of the downlink fluctuates during the communication of the uplink due to the passage of time, the fluctuation of the propagation path of the uplink is directly considered. Since prioritization is performed, more accurate frequency scheduling becomes possible.
- FIG. 21 is a block diagram showing a main configuration of mobile device 300 according to Embodiment 3 of the present invention.
- the mobile device 300 has the same basic configuration as the mobile device 100 shown in FIG.
- the same components are denoted by the same reference numerals, and description thereof will be omitted.
- mobile device 300 further includes a movement determination unit 301 and a data type determination unit 302, and when the mobile device is not in a moving state, or when the received data is of a specific data type. In the case of the above, it is to stop predetermined circuits that do not need to be operated.
- Movement determining section 301 determines whether or not the mobile station itself is in a moving state by measuring a Doppler frequency from the channel estimation value output from propagation path estimating section 126. When it is determined that the mobile station is not in the moving state, the control signal (stop signal) C31 is output to the propagation path determination section 131, and the propagation path determination section 131 is stopped for a certain time. It should be noted that the determination of the moving state may be performed using a GPS (Global Positioning System) signal.
- GPS Global Positioning System
- the largest factor that changes the propagation path state is the movement of the mobile device itself. Therefore, in the present embodiment, when it is determined by the movement determination unit 301 that the mobile station is not in the moving state, the change in the propagation path state in a relatively short time is estimated to be small, and the predetermined This circuit, that is, the propagation path determination unit 131 is stopped for a certain period of time. As a result, the power S of the mobile device 300 can be reduced.
- the movement determination unit 301 when a predetermined time has elapsed after outputting the stop control signal C31, the movement determination unit 301 outputs an operation start control signal C31 and restarts the operation of the propagation path determination unit 131. Further, if it is detected that the own device has been moved before the predetermined time elapses, it outputs a control signal C31 for starting operation and restarts the operation of the propagation path determination unit 131.
- Data type determination section 302 determines the type of received data output from decoding section 129, such as audio data, streaming data, and packet data. Then, in the case of a specific data type, a control signal (stop signal) C32 is output to the transmission section 110, and the transmission of the ACK / NACK signal is stopped for a certain time.
- a control signal (stop signal) C32 is output to the transmission section 110, and the transmission of the ACK / NACK signal is stopped for a certain time.
- mobile station 300 notifies the base station apparatus of a subband having a good propagation path state. Therefore, it can be said that the probability that mobile device 300 erroneously receives data transmitted from the base station device within a certain period of time is low.
- the types of received data are audio data and streaming data distributed by video stream.
- Data and packet data such as e-mail.
- voice data, streaming data, and the like have a feature that data is transmitted continuously from the base station apparatus, which has a strong real-time property, and that some reception errors are allowed.
- packet data is characterized in that it has weak real-time characteristics, allows some transmission delay, and is transmitted intermittently.
- the base station apparatus if the received data is data continuously transmitted from the base station apparatus, the base station apparatus notifies the base station apparatus of a subband with a good propagation path state within a short time. In this case, the transmission of the ACKZ NACK signal, that is, the automatic retransmission control is stopped for a certain period of time under the presumption that the probability of receiving this data by mistake is low. Thus, power consumption of mobile device 300 can be reduced.
- the automatic retransmission control can be stopped. In such a case, the automatic retransmission control is stopped for a certain period of time or until the data type changes.
- FIG. 22 is a flowchart showing a procedure of a circuit stop process of the movement determination unit 301 and the data type determination unit 302.
- movement determination section 301 measures the movement state of mobile device 300 (ST3010). Then, it is determined whether mobile device 300 is moving or stationary (ST3020). If it is determined that mobile device 300 is moving, normal processing as already described in Embodiments 1 and 2 is performed (ST3030). On the other hand, when it is determined in ST3020 that the vehicle is stationary, movement determination unit 301 stops propagation path determination unit 131 (ST3040). At this time, in response to the stoppage of the propagation path determination unit 131, the frequency selection unit 113 holds the state of the switch (maintains the current state).
- data type determination section 302 determines the quality of service (QoS) of the received data, that is, determines the data type (ST3050). If the received data is audio data, streaming data, or the like (ST3060), transmission of the ACKZNACK signal is stopped (ST3070). After that, the process returns to ST3010 to monitor (measure) the moving state again. On the other hand, if the received data is not audio data or the like in ST3060, the process directly returns to ST3010. As described above, according to the present embodiment, when there is no movement state, or when the received data is data that is continuously transmitted, the predetermined part of the circuit that does not need to be operated is not required. , The power consumption of the mobile device 300 can be reduced.
- QoS quality of service
- FIG. 23 is a diagram illustrating an outline of the transmission / reception method according to Embodiment 4 of the present invention.
- a communication system that performs frequency scheduling on the downlink is used, and the update cycle of frequency scheduling, that is, the cycle for changing the allocation of each subband to each user, and the ACKZNACK signal of the uplink
- the update cycle of frequency scheduling that is, the cycle for changing the allocation of each subband to each user, and the ACKZNACK signal of the uplink
- the mobile station according to the present embodiment operates only when the downlink frequency scheduling is updated (section P2), and performs the uplink transmission according to the method shown in Embodiment 1 above. Perform ACKZNACK transmission.
- time slots (uplink slots) other than when frequency scheduling is updated (sections Pl and P3), one user occupies and uses the subband allocated in the previous frequency scheduling.
- the section P1 adopts a normal uplink slot configuration, and here, sub-bands allocated to user # 1, user # 2, ..., user #N by frequency scheduling, respectively. Each user continues to use band # 1, subband # 2, ⁇ , subband #N in section P1. For example, in time slots tl and t2, user # 1, user # 2,..., User #N use subband # 1, subband # 2,. Is sent.
- each user (mobile station) is set as described in the first embodiment. Then, the base station apparatus is notified of a subband having a good propagation path condition using an ACK / NACK signal.
- the base station apparatus identifies the subband used by the ACK / NACK signal of each user, and performs frequency scheduling, that is, assigns a subband to each user based on the subband information. That is, in section P2, the transmission / reception method described in Embodiment 1 is applied.
- the determination of the propagation path state may use an average value such as a propagation path estimation value in the entire section P1, A channel estimation value or the like in a specific section within the inter-PI may be used.
- each user performs communication according to the subband allocation determined in the section P2.
- subband # 1 is assigned to user # 1
- subband # 1 is assigned to user # 2
- subband # 2 is assigned to user #N.
- FIG. 24 and FIG. 25 are block diagrams schematically showing mobile station 400 and base station apparatus 450 according to the present embodiment for realizing the above operation. Note that mobile station 400 and base station apparatus 450 both have the same configuration.
- OFDMA transmission / reception sections 411 and 423 for performing normal OFDMA transmission / reception and transmission / reception sections 110 and 120 shown in Embodiment 1 are connected to frequency scheduling update cycle.
- the base station apparatus 450 switches between the OFDMA transmitting / receiving sections 461 and 473 that perform normal OFDMA transmission / reception and the transmitting / receiving sections 160 and 170 described in the first embodiment in accordance with the frequency scheduling update cycle.
- the transmission / reception units 110, 120, 160, and 170 do not have a common RF unit or antenna configuration with the OFDMA transmission / reception units 411, 423, 461, and 473. Shown as sections 110a, 120a, 160a, 170a.
- control unit 401 operates the switch 412
- the control unit 451 controls the switches 462 and 472.
- Descriptions of the RF layers 413, 421, 463, 471 and the antennas 402, 452 are omitted, and input / output signals are not shown for simplicity.
- FIG. 26 and FIG. 27 are block diagrams showing main configurations inside OFDMA transmitting section 411 and OFDMA receiving section 423 of mobile station 400 described above.
- FIGS. 28 and 29 are block diagrams showing the main components inside OFDMA transmitting section 461 and OFDMA receiving section 473 of base station apparatus 450 described above. Note that these devices have the same basic configuration as transmitting units 110 and 160 and receiving units 120 and 170 shown in Embodiment 1 (see FIGS. 1 and 7), and have the same components. Are denoted by the same reference numerals, and description thereof is omitted. The description of the encoding unit, the demodulation unit, and the decoding unit, which are general configurations, is also omitted.
- control section 401 of mobile station 400 and control section 451 of base station apparatus 450 will be described in more detail.
- the basic operation of both control unit 401 and control unit 451 Identical.
- OFDMA transmitting section 411 and OFDMA receiving section 423 hold the updated subband allocation of each user. More specifically, the frequency selection unit 113 of the OFDMA transmission unit 411, the separation / selection unit 125 of the OFDMA reception unit 423, the frequency selection unit 164 of the OFDMA transmission unit 461, and the user selection unit 175 of the OFDMA reception unit 473 Subband assignments are retained. Note that the frequency scheduling update cycle is known to both the mobile station 400 and the base station apparatus 450, is a predetermined value, and is specified by the number of frames.
- Control section 401 and control section 451 switch each switch according to the internal counter.
- the control unit 401 will be described as an example. Specifically, the control unit 401 increments the number-of-frames counter by one for each radio frame, and when the counter value becomes equal to the frequency scheduling update cycle, switches the switch switching control signal C41 to the switches 412 and 422. The output is performed so that the transmission unit 110a and the RF unit 413 are connected to each other, and the reception unit 120a and the RF unit 421 are connected to each other. At this time, the frame number measurement counter is cleared. On the other hand, when the counter value is different from the frequency scheduling update cycle, the control unit 401 connects the OFDMA transmitting unit 411 and the RF unit 413, and the OFDMA receiving unit 423 and the RF unit 421 by the switch switching control signal C41. To do.
- transmitting section 110a having a configuration similar to transmitting section 110 shown in Embodiment 1 is used as a transmitting section paired with OFDMA transmitting section 411.
- this may be a configuration similar to the transmitting section 210 shown in the second embodiment.
- mobile station 400 according to the present embodiment has a configuration similar to receiving section 120 shown in Embodiment 1 as a receiving section to be paired with OFDMA receiving section 423.
- the description has been given by taking as an example the case where the receiving unit 120a is used, this is a configuration similar to the receiving unit 220 described in the second embodiment or a configuration similar to the receiving unit 320 described in the third embodiment. May be.
- the power described in the example in which one user performs communication using one subband is described.
- One user uses a plurality of subbands, and for example, user # 1 Communication may be performed using subbands # 1 and # 2.
- the transmitting / receiving apparatus is not limited to the above-described Embodiments 14 to 14, and can be implemented with various modifications.
- Embodiments 14 can be implemented in appropriate combinations.
- the transmission / reception device can also be used in a wired communication system such as ADSL (Asymmetric Digital Subscriber Line), thereby providing a wired communication system that performs efficient frequency scheduling. can do.
- ADSL Asymmetric Digital Subscriber Line
- the force S described by taking the TDD communication system as an example is not limited to this.
- an FDD communication system may be used.
- the present invention can also be realized by software.
- the algorithm of the receiving method or the transmitting method according to the present invention is described in a programming language, and this program is stored in a memory and executed by the information processing means. A similar function can be realized.
- Each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually formed into one chip, or may be formed into one chip so as to include some or all of them.
- an LSI it may also be called an IC, a system LSI, a super LSI, a penetra LSI, or the like.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- Reconfigurable FPGA Field Programmable Gate Array
- connection or setting of circuit cells inside LSI after LSI manufacturing An efficient reconfigurable processor may be used.
- a first aspect of the receiving apparatus of the present invention is a determining means for determining a state of a propagation path through which a received multicarrier signal has passed, and according to a result of the determination, from among the used frequency bands of the received multicarrier signal.
- a configuration is provided that includes a specifying unit that specifies an area whose propagation path state is equal to or higher than a predetermined level, and a notifying unit that notifies the transmitting apparatus of area information indicating the specified area.
- a frequency band used by the received multi-carrier signal is divided into a plurality of frequency bands known by both the transmitting apparatus and the receiving apparatus,
- the specifying unit includes a selecting unit that selects a frequency band whose propagation path state is equal to or higher than a predetermined level among the plurality of frequency bands, and the notifying unit is configured to select a frequency band via the frequency band selected by the selecting unit.
- a configuration is employed in which a notification signal is transmitted to notify the transmitting device of the area information.
- a subband whose propagation path state is equal to or higher than a predetermined level is selected, and a notification signal is transmitted to the transmitting side via the selected subband. Therefore, the transmitting side can recognize the frequency band in which the propagation path condition is good only by checking the sub-band used for the notification signal (without performing processing such as decoding on the notification signal). In addition, processing such as decoding is not performed, so that processing delay does not occur.
- a third aspect of the receiving apparatus of the present invention employs, in the above configuration, a configuration in which the notification signal is an ACK signal and a NACK signal in automatic retransmission control.
- a fourth aspect of the receiving apparatus of the present invention employs, in the above configuration, a configuration in which the ACK signal and the NACK signal are distinguished by a difference in pilot pattern or transmission power.
- ACKZNACK determination processing can be performed by pilot pattern correlation processing, pattern matching, and the like. That is, demodulation processing and decoding processing such as error correction are not required. Therefore, the processing delay can be reduced, and the throughput of the communication system can be improved.
- a fifth aspect of the receiving device of the present invention is the receiving device according to the above configuration, wherein the receiving signal sets a modulation scheme of a transmission signal based on reception quality of the received multicarrier signal, A configuration is adopted in which modulation is performed by a modulation scheme having a higher transmission rate than a modulation scheme set based on the reception quality.
- the transmitting side transmits data using subbands with good propagation path conditions, so that the receiving performance of the receiving side is improved.
- the transmission rate is higher.
- MCS can be selected.
- the receiving apparatus further includes creating means for creating additional information on the frequency band selected by the selecting means, wherein the selecting means A plurality of frequency bands in which the road condition is included in a region of a predetermined level or more are selected, and the creating unit assigns a rank to the frequency bands selected by the selecting unit in accordance with the propagation path condition, and ranks the rank.
- the notifying unit notifies the transmitting device of the additional information in addition to the area information.
- the mobile station assigns priorities to a plurality of subbands having good propagation path conditions in the downlink and notifies the base station of the subbands.
- the base station can perform frequency scheduling in consideration of the situation of multiple users (with adjustment among multiple users). Therefore, the throughput of the communication system can be improved.
- the notifying unit changes a pilot pattern or transmission power of the notifying signal in accordance with an order given by the creating unit.
- a configuration for notifying the transmitting device of the additional information is adopted. According to this configuration, it is possible to determine the content of the notification signal without performing demodulation processing or decoding processing. Therefore, the processing delay can be reduced, and the throughput of the communication system can be improved.
- the reception process of the received multicarrier signal is performed in the region specified by the specifying unit.
- the configuration to perform is adopted.
- the identification means for identifying the type of data mapped to the received multi-carrier signal, and the type of the identified data is transmitted from the transmitting apparatus.
- a control means for stopping some circuits for a predetermined time is adopted.
- a tenth aspect of the receiving apparatus of the present invention in the above configuration, is used as a mobile station in a mobile communication system, and a judging means for judging whether or not the own station is in a stationary state. And control means for stopping a part of the circuits for a predetermined time when it is determined to be in a stationary state.
- the receiving device further includes an obtaining unit that obtains the number of communication terminals in the communication system to which the own device belongs. When the number of communication terminals is less than or equal to a predetermined value, the notification signal is repeated.
- a twelfth aspect of the receiving apparatus of the present invention in the above configuration, is used as a communication terminal in a communication system, and the obtaining unit is notified of the number of communication terminals from a base station of the communication system. Take the configuration.
- the determination means performs any one of the above-described estimation of the propagation path variation of the received multicarrier signal and the measurement of the reception quality, A configuration for determining a propagation path state of the received multicarrier signal is employed.
- a fourteenth aspect of the receiving apparatus of the present invention employs a configuration in which, in the above-described configuration, a plurality of subcarrier signals included in the frequency band are respectively allocated to the own apparatus and another receiving apparatus in advance. .
- a fifteenth aspect of the receiving apparatus of the present invention employs, in the above configuration, a configuration in which the notification signal is code division multiplexed.
- the used frequency band of the transmission multicarrier signal is divided into a plurality of frequency bands known by both the transmitting apparatus and the receiving apparatus, and among the plurality of frequency bands, Acquiring means for acquiring, from a receiving apparatus, frequency band information indicating a frequency band whose propagation path state is equal to or higher than a predetermined level, and transmitting means for transmitting a signal addressed to the receiving apparatus via a frequency band indicated by the frequency band information. Is adopted.
- the acquiring means includes a recognizing means for recognizing a frequency band through which a signal from the receiving apparatus has passed, and a recognizing frequency band. And a determination means for determining that the propagation path state is in a frequency band equal to or higher than a predetermined level.
- a third aspect of the transmitting apparatus in the above-described configuration, is used as a base station of a communication system accommodating a plurality of communication terminals, and wherein the obtaining means includes the frequency band information Each communication terminal obtains the order of the propagation path state in the frequency band, and the transmitting means performs frequency scheduling of a signal addressed to each communication terminal based on the frequency band information and the order of the propagation path state in the frequency band. Take the configuration.
- the transmitting means transmits the frequency band determined by frequency scheduling to each of the communication terminals before transmitting a signal addressed to each of the communication terminals.
- a configuration for notifying the communication terminal is adopted.
- the transmitting unit transmits the notification signal of the notification via a frequency band determined by frequency scheduling.
- the transmitting means assigns a lower frequency band to a communication terminal having higher priority in frequency scheduling.
- the transmitting unit instructs each communication terminal of the number of times of repetition of the frequency band information according to the number of communication terminals accommodated. take.
- a first aspect of the receiving method of the present invention is a determining step of determining a state of a propagation path through which a received multicarrier signal has passed, and according to a result of the determination, a frequency band used in the received multicarrier signal.
- a specific step of specifying an area whose propagation path state is equal to or higher than a predetermined level, and a notification step of notifying the transmitting apparatus of area information indicating the specified area are provided.
- a frequency band used for a transmission multicarrier signal is divided into a plurality of frequency bands known by both a transmitting device and a receiving device, and An acquiring step of acquiring frequency band information indicating a frequency band whose propagation path state is equal to or higher than a predetermined level from a receiving device, and a transmitting step of transmitting a signal addressed to the receiving device via a frequency band indicated by the frequency band information, Was provided.
- the transmission / reception device has the effect of improving the system 'throughput, and is useful as a transmission / reception device used in an OFDMA communication system.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN2005800036892A CN1914838B (zh) | 2004-01-29 | 2005-01-27 | 收发装置以及收发方法 |
BRPI0507202A BRPI0507202B1 (pt) | 2004-01-29 | 2005-01-27 | aparelho de transmissão / recepção e método de transmissão / recepção |
EP05709377A EP1705818A1 (en) | 2004-01-29 | 2005-01-27 | Transmitting/receiving apparatus and transmitting/receiving method |
US10/586,970 US8064897B2 (en) | 2004-01-29 | 2005-01-27 | Transmitting/receiving apparatus and transmitting/receiving method |
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JP2004-021198 | 2004-01-29 | ||
JP2004021198 | 2004-01-29 | ||
JP2005-018149 | 2005-01-26 | ||
JP2005018149A JP4418377B2 (ja) | 2004-01-29 | 2005-01-26 | 通信端末装置および基地局装置 |
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PCT/JP2005/001103 WO2005074178A1 (ja) | 2004-01-29 | 2005-01-27 | 送受信装置および送受信方法 |
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US (1) | US8064897B2 (ja) |
EP (1) | EP1705818A1 (ja) |
JP (1) | JP4418377B2 (ja) |
KR (1) | KR101065156B1 (ja) |
CN (1) | CN1914838B (ja) |
BR (1) | BRPI0507202B1 (ja) |
WO (1) | WO2005074178A1 (ja) |
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- 2005-01-27 KR KR1020067015431A patent/KR101065156B1/ko active IP Right Grant
- 2005-01-27 CN CN2005800036892A patent/CN1914838B/zh not_active Expired - Fee Related
- 2005-01-27 EP EP05709377A patent/EP1705818A1/en not_active Withdrawn
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US7586834B2 (en) | 2004-05-31 | 2009-09-08 | Samsung Electronics Co., Ltd | Method and apparatus for transmitting uplink acknowledgement information in an OFDMA communication system |
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US8064393B2 (en) | 2005-08-05 | 2011-11-22 | Panasonic Corporation | Wireless communication base station apparatus and wireless communication method in multicarrier communication |
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US8265179B2 (en) | 2005-08-23 | 2012-09-11 | Mitsubishi Electric Corporation | Wireless communication system and communication apparatus |
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JPWO2007052397A1 (ja) * | 2005-10-31 | 2009-04-30 | 日本電気株式会社 | 送受信システム、伝送装置、及びそれらに用いるパイロット信号多重方法 |
CN101288254B (zh) * | 2005-10-31 | 2012-10-31 | 日本电气株式会社 | 发送/接收系统、发送设备及其中使用的导频信号复用方法 |
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EP1977544A4 (en) * | 2006-01-18 | 2014-04-09 | Nec Corp | METHOD AND SYSTEM FOR SUPPORTING A SCALABLE BANDWIDTH |
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EP2031781A4 (en) * | 2006-06-19 | 2009-12-30 | Panasonic Corp | TRANSMITTER AND RECEIVER FOR DIGITAL BROADCASTING |
JP2013085270A (ja) * | 2006-10-24 | 2013-05-09 | Qualcomm Inc | 無線通信のための確認応答チャネル |
US9264183B2 (en) | 2006-10-24 | 2016-02-16 | Qualcomm Incorporated | Acknowledgment channel for wireless communications |
JP2010050967A (ja) * | 2008-08-19 | 2010-03-04 | Fujitsu Ltd | サブチャネル選択方法と装置及びこの装置を用いた受信機 |
Also Published As
Publication number | Publication date |
---|---|
EP1705818A1 (en) | 2006-09-27 |
US20070155323A1 (en) | 2007-07-05 |
BRPI0507202A8 (pt) | 2016-08-02 |
KR20060130153A (ko) | 2006-12-18 |
KR101065156B1 (ko) | 2011-09-16 |
CN1914838A (zh) | 2007-02-14 |
JP4418377B2 (ja) | 2010-02-17 |
CN1914838B (zh) | 2010-09-29 |
JP2005244958A (ja) | 2005-09-08 |
BRPI0507202A (pt) | 2007-06-12 |
BRPI0507202B1 (pt) | 2018-12-18 |
US8064897B2 (en) | 2011-11-22 |
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