WO2011093096A1 - 基地局、端末、再送制御方法、及び応答方法 - Google Patents
基地局、端末、再送制御方法、及び応答方法 Download PDFInfo
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- WO2011093096A1 WO2011093096A1 PCT/JP2011/000483 JP2011000483W WO2011093096A1 WO 2011093096 A1 WO2011093096 A1 WO 2011093096A1 JP 2011000483 W JP2011000483 W JP 2011000483W WO 2011093096 A1 WO2011093096 A1 WO 2011093096A1
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- component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a base station, a terminal, a retransmission control method, and a response method.
- LTE-Advanced which is currently being standardized in 3GPP, a carrier that divides the transmission band into component carriers (CC), performs uplink / downlink packet transmission for each CC, and performs some cooperative operation between CCs Aggregation is being considered.
- the downlink component carrier is defined by a band delimited by the downlink frequency band information in the BCH broadcast from the base station, or a dispersion width when the downlink control channel (PDCCH) is distributed in the frequency domain. May be defined as a bandwidth.
- the uplink component carrier includes a band delimited by uplink frequency band information in the BCH broadcast from the base station or a PUSCH (Physical Uplink Shared CHannel) region near the center, and PUCCH for LTE at both ends. May be defined as a basic unit of a communication band of 20 MHz or less including.
- a component carrier may be defined by a physical cell number and a carrier frequency number, and may be called a cell.
- SC-FDMA Single Carrier
- each user's transmission waveform has a single carrier characteristic. Therefore, according to SC-FDMA, CM (Cubic metric) / PARP can be kept low. Further, since SC-FDMA has a feature of orthogonal frequency division multiplexing, it is possible to employ a multiplexing method in which data for a plurality of users are adjacently frequency-division multiplexed (FDM) in units of subcarriers.
- FDM frequency-division multiplexed
- H-ARQ Hybrid Automatic Repeat Request
- PUCCH uplink control channel
- a downlink packet is transmitted with one downlink CC, and a response signal is transmitted with the PUCCH of the uplink CC corresponding to the downlink CC.
- the channel selection technique is to change the uplink CC and signal point (symbol on the constellation) used for transmission of the response signal according to the reception success / failure pattern of a plurality of downlink packets transmitted by a plurality of CCs.
- This is a technique for transmitting a response signal (see Non-Patent Document 1). That is, this is a technique for collecting ACK / NACK information for a plurality of downlink packets and transmitting a response signal using the PUCCH of one CC (see FIGS. 2 and 3).
- CC # 0 DTX in FIG. 3 is transmitted before DL # 0, which is downlink control information for recognizing that DL # 0 has been transmitted (that is, the terminal needs to receive DL # 0). This means a case in which reception of (downlink control information) is missed.
- GPP TS 36.213 V8.7.0 10.1 UE procedure for determining physical uplink control channel assignment
- a heterogeneous network is being studied as a system for flexibly arranging a plurality of cells having different cell radii and the number of accommodated UEs.
- a macro cell with a large cell radius and a femto cell with a small cell radius are arranged (see FIG. 4).
- the LTE and LTE-Advanced systems described above are applied to both the macro cell and the femto cell.
- the terminal of the macro cell can reduce the interference power to the femto cell while maintaining the reception characteristics of other terminals in the macro cell by suppressing the transmission power in a part of the CC group.
- a communication method with lower interference tolerance than a CC with large interference can be used in a CC with small interference (see FIG. 4). That is, when BPSK is used as a modulation scheme in a CC with a large amount of interference, a QPSK with a low interference tolerance but a large transmission rate can be used in a CC with a small amount of interference.
- the constellation used in the channel selection shown in FIG. 3 is a constellation similar to QPSK in the first CC (corresponding to three of the four signal points of the QPSK constellation),
- the second CC is a BPSK constellation.
- CC # 0 and CC # 1 a first pattern using a constellation similar to QPSK and a BPSK constellation for CC # 0 and CC # 1, respectively
- BPSK constellation and second pattern using constellation similar to QPSK can be considered for # 0 and CC # 1, respectively.
- the transmission power of a signal transmitted with CC # of QPSK is compared with the transmission power of a signal transmitted with CC # of BPSK, it is transmitted with CC # of QPSK so as to satisfy the required quality.
- the transmission power of the signal to be transmitted is higher.
- An object of the present invention is to provide a base station, a terminal, a retransmission control method, and a response method capable of preventing deterioration of reception characteristics of nearby cells when carrier aggregation and channel selection are applied. .
- a component carrier and a signal that a terminal feeds back a response signal to downlink data transmitted by the plurality of component carriers based on a parameter related to interference tolerance of a plurality of component carriers between a plurality of cells.
- Control means for changing a combination rule with a point, receiving means for performing reception processing using a combination of a component carrier candidate and a signal point candidate corresponding to the changed combination rule information, and outputting a processing result; and Specifying means for specifying a combination of the component carrier candidate and the signal point candidate used for feedback of the response signal based on the result.
- One aspect of the terminal of the present invention is a receiving rule for receiving downlink data on a plurality of component carriers, and a combination rule of a component carrier and a signal point that feeds back a response signal for downlink data received on the plurality of component carriers.
- the combination rule is changed based on information indicating the combination rule determined based on the above or a parameter relating to interference tolerance of a plurality of component carriers between a plurality of cells.
- a terminal feeds back a response signal for downlink data transmitted from a base station using a plurality of component carriers based on a parameter related to interference tolerance of a plurality of component carriers between a plurality of cells
- a step of changing a combination rule of a component carrier and a signal point, a step of receiving processing using a combination of a component carrier candidate and a signal point candidate corresponding to the changed combination rule information, and a result of the reception processing And identifying a combination of the component carrier candidate and the signal point candidate used for feedback of the response signal based on the response signal.
- One aspect of the response method of the present invention is based on the step of changing a combination rule of a component carrier and a signal point that feeds back a response signal for downlink data received by a plurality of component carriers, and the changed combination rule.
- Transmitting the response signal to a base station, and the combination rule is information indicating the combination rule determined by the base station based on interference tolerance of the plurality of component carriers, or a plurality of information It is changed based on a parameter relating to interference tolerance of a plurality of component carriers between cells.
- the present invention it is possible to provide a base station, a terminal, a retransmission control method, and a response method that can prevent deterioration of reception characteristics of nearby cells when carrier aggregation and channel selection are applied. .
- Diagram for explaining conventional problems Diagram for explaining channel selection technology Diagram for explaining channel selection technology Diagram for explaining heterogeneous network (Heterogeneous network)
- the block diagram which shows the structure of the base station which concerns on Embodiment 1 of this invention.
- the block diagram which shows the structure of the terminal which concerns on Embodiment 1 of this invention.
- this communication system when communication by Carrier aggregation is performed, Channel Selection is adopted in ARQ. That is, this communication system is, for example, an LTE-A system, the base station 100 is, for example, an LTE-A base station, and the terminal 200 is, for example, an LTE-A terminal.
- FIG. 5 is a block diagram showing a configuration of base station 100 according to Embodiment 1 of the present invention.
- the base station 100 includes a response scheme control unit 101, encoding units 102, 103, and 104, data transmission control units 105 and 106, modulation units 107, 108, and 109, and a serial-parallel conversion unit (S / P) 110, 111, 112, multiplexing unit 113, IFFT unit 114, CP adding unit 115, radio transmitting unit 116, radio receiving unit 117, CP removing unit 118, DFT unit 119, and separation Unit 120, channel compensation units 121 and 122, IDFT units 123 and 124, demodulation units 125 and 126, and channel selection determination unit 127.
- S / P serial-parallel conversion unit
- Response scheme control section 101 determines a combination rule of uplink component carriers and signal points to which terminal 200 feeds back a response signal for downlink data transmitted from base station 100 using a plurality of downlink component carriers, and the determined rule Is output to the encoding unit 102.
- the response method control unit 101 determines the rule based on the input femtocell information.
- This femtocell information includes information indicating the interference resistance of a plurality of uplink component carriers used by the femtocell.
- the femto cell is a cell that is close to or smaller than the macro cell covered by the base station 100 and is included in the macro cell. Details of the rules will be described later in detail.
- Encoding section 102 receives downlink control data (including information indicating the above-described rule) as input, performs encoding processing (such as a turbo code or a convolutional code) on the input data, and uses CRC bits for retransmission control. Is added. Data subjected to the encoding process and the CRC bit addition process is modulated by the modulation unit 107.
- encoding processing such as a turbo code or a convolutional code
- Encoding section 103 receives transmission data (packet) transmitted on component carrier # 0, performs encoding processing (such as turbo code or convolutional code) on the transmission data, and uses CRC bits for retransmission control. Is added.
- the data that has been subjected to the encoding process and the CRC bit addition process is output to the data transmission control unit 105.
- Encoding section 104 receives transmission data (packet) transmitted by component carrier # 1, performs encoding processing (such as turbo code or convolutional code) on the transmission data, and uses CRC bits for retransmission control. Is added.
- the data subjected to the encoding process and the CRC bit addition process is output to the data transmission control unit 106.
- the data transmission control unit 105 holds the encoded transmission data (CC # 0) and outputs it to the modulation unit 108 during the initial transmission.
- the encoded transmission data is held for each destination terminal 200.
- the data transmission control unit 105 upon receiving NACK or DTX for downlink data transmitted by CC # 0 from the channel selection determination unit 127, the data transmission control unit 105 outputs retained data corresponding to this CC # 0 to the modulation unit 108.
- data transmission control section 105 receives an ACK for downlink data transmitted by CC # 0 from channel selection determination section 127, data transmission control section 105 deletes the retained data corresponding to CC # 0.
- the data transmission control unit 106 performs the same processing as the data transmission control unit 105 on the data transmitted by CC # 1.
- the processing of the data transmission control unit 105 and the data transmission control unit 106 enables not only retransmission control of the entire data transmitted to the destination terminal 200 but also retransmission control for each component carrier.
- the modulation unit 108 modulates transmission data received from the data transmission control unit 105, and the modulation unit 109 modulates transmission data received from the data transmission control unit 106.
- modulated signals transmitted from CC # 0 and CC # 1 are formed.
- the modulation signals formed in the modulation units 107, 108, and 109 are transmitted here as OFDM signals. Therefore, as will be described later, the serial-parallel conversion units 110, 111, and 112, the multiplexing unit 113, and , The IFFT unit 114 and the CP adding unit 115 perform processing.
- the serial / parallel conversion unit 110 performs serial / parallel conversion on the modulation signal formed by the modulation unit 107 and outputs the obtained parallel signal group to the multiplexing unit 113.
- the serial / parallel conversion units 111 and 112 perform the same processing as the serial / parallel conversion unit 110 on the modulation signals formed by the modulation unit 108 and the modulation unit 109.
- the multiplexing unit 113 multiplexes signals received from the serial / parallel conversion units 110, 111, and 112. That is, in the multiplexing unit 113, the packet transmitted on the downlink CC # 0, the packet transmitted on the downlink CC # 1, and the control channel are multiplexed.
- the IFFT unit 114 performs an IFFT process on the signal multiplexed by the multiplexing unit 113, and converts the frequency domain signal into a time domain signal to form an OFDM symbol.
- CP adding section 115 adds the rear part of the OFDM symbol obtained by IFFT section 114 to the beginning of the OFDM symbol as a CP.
- the radio transmission unit 116 performs radio transmission processing (D / A conversion, up-conversion, etc.) on the OFDM signal received from the CP addition unit 115, and transmits it via the antenna.
- the wireless reception unit 117 performs wireless reception processing (down-conversion, A / D conversion, etc.) on the signal received via the antenna.
- the CP removal unit 118 removes the CP from the received signal after the wireless reception process.
- the DFT unit 119 performs DFT processing on the signal from which the CP has been removed, and converts the received signal into a frequency domain signal.
- the separation unit 120 extracts a signal corresponding to the PUCCH resource region of each uplink CC from the reception signal received from the DFT unit 119.
- demultiplexing section 120 extracts a signal corresponding to the PUCCH resource region of uplink CC # 0 from the received signal received from DFT section 119, and channel compensation section 121 Output to.
- Separation section 120 extracts a signal corresponding to the PUCCH resource region of uplink CC # 1 from the received signal received from DFT section 119, and outputs the signal to channel compensation section 122.
- Channel compensation units 121 and 122 extract pilot symbols from the signal received from demultiplexing unit 120, and perform frequency domain equalization processing using the pilot symbols.
- the IDFT units 123 and 124 convert the signal after channel compensation from a frequency domain signal to a time domain signal.
- the demodulation units 125 and 126 perform demodulation processing based on the rules determined by the response method control unit 101.
- the channel selection determination unit 127 performs downlink CC # 0 and downlink CC # based on the demodulation result for each uplink CC obtained by the demodulation unit 125 and the demodulation unit 126 and the rule determined by the response method control unit 101. 1 determines the error detection result (that is, ACK / NACK) of the downlink data transmitted in 1.
- FIG. 6 is a block diagram showing a configuration of terminal 200 according to Embodiment 1 of the present invention.
- a terminal 200 includes a radio reception unit 201, a CP removal unit 202, an FFT unit 203, a channel compensation unit 204, a separation unit 205, and parallel-serial conversion units (P / S) 206, 207, 208.
- P / S parallel-serial conversion units
- the wireless reception unit 201 performs wireless reception processing (down-conversion, A / D conversion, etc.) on the signal received via the antenna.
- the CP removal unit 202 removes the CP from the received signal after the wireless reception process.
- the FFT unit 203 performs FFT processing on the signal from which the CP has been removed, and converts the received signal into a frequency domain signal.
- the channel compensation unit 204 extracts pilot symbols from the signal received from the FFT unit 203, and performs frequency domain equalization processing using the pilot symbols.
- the demultiplexing unit 205 extracts the downlink control channel and the reception symbol of each downlink CC from the reception signal received from the channel compensation unit 204.
- demultiplexing section 205 extracts the reception symbol of downlink CC # 0 from the reception signal received from channel compensation section 204, and outputs it to parallel-serial conversion section 207.
- Separation section 205 extracts the received symbol of downlink CC # 1 from the received signal received from channel compensation section 204 and outputs the received symbol to parallel-serial conversion section 208.
- Separation section 205 extracts the downlink control channel from the received signal received from channel compensation section 204 and outputs the extracted downlink control channel to parallel / serial conversion section 206.
- the parallel-serial conversion unit 206 performs parallel-serial conversion on the downlink control channel received from the separation unit 205 and outputs the obtained serial signal to the demodulation unit 209.
- the parallel-serial converters 207 and 208 perform the same processing as that of the parallel-serial converter 206 on each of the downlink CC # 0 and downlink CC # 1 received signals received from the separator 205.
- the demodulation units 209, 210, and 211 perform demodulation processing on the signals received from the parallel / serial conversion units 206, 207, and 208, respectively.
- the decoding unit 212 performs error correction decoding (such as turbo decoding or Viterbi decoding) on the received bit likelihood received from the demodulation unit 209 and obtained from the downlink control channel.
- the decoding unit 213 performs error correction decoding (such as turbo decoding or Viterbi decoding) on the received bit likelihood of the downlink packet of downlink CC # 0 received from the demodulation unit 210.
- the decoding unit 214 performs error correction decoding (such as turbo decoding or Viterbi decoding) on the received bit likelihood of the downlink packet of downlink CC # 1 received from the demodulation unit 211.
- the error determination unit 215 determines whether or not there is an error in the decoding result obtained by the decoding unit 213 (that is, the decoding result of the downlink packet of downlink CC # 0). Further, error determination section 216 determines whether or not there is an error in the decoding result obtained by decoding section 214 (that is, the decoding result of the downlink packet of downlink CC # 1).
- the control unit 217 Control transmission.
- control unit 217 first selects a response signal transmission rule based on the information on the rule.
- the control unit 217 transmits a response signal based on the selected transmission rule and the error detection result (that is, the reception success / failure pattern) of the downlink packet of downlink CC # 0 and the downlink packet of downlink CC # 1.
- a combination of an uplink component carrier and a signal point to be used is determined.
- Information on the uplink component carrier used for transmission of the response signal determined in this way is output to the channel selection unit 218, while information on the signal point is output to the modulation unit 219 and the modulation unit 220.
- control unit 217 The processing in the control unit 217 will be described in detail later.
- the channel selection unit 218 outputs a response signal to the modulation unit corresponding to the uplink component carrier indicated by the uplink component carrier information received from the control unit 217. That is, when the uplink component carrier information received from the control unit 217 indicates uplink CC # 0, the channel selection unit 218 outputs a response signal to the modulation unit 219, while indicating uplink CC # 1. In the case, the response signal is output to the modulation unit 220.
- the modulation units 219 and 220 modulate the response signal using signal points indicated by information received from the control unit 217.
- the DFT units 221 and 222 perform DFT processing on the modulation signals received from the modulation units 219 and 220 to convert them into frequency domain signals.
- the multiplexing unit 223 multiplexes signals received from the DFT units 221 and 222. However, since the response signals are not simultaneously output from the channel selection unit 218 to the modulation units 219 and 220, they are not actually multiplexed by the multiplexing unit 223.
- the IDFT unit 224 performs IDFT processing on the signal received from the multiplexing unit 223 and converts the signal in the frequency domain into a signal in the time domain, thereby forming an OFDM symbol.
- CP adding section 225 adds the rear part of the OFDM symbol obtained by IDFT section 224 as a CP to the head of the OFDM symbol.
- the wireless transmission unit 226 performs wireless transmission processing (D / A conversion, up-conversion, etc.) on the OFDM signal received from the CP addition unit 225, and transmits it via the antenna.
- the response scheme control unit 101 determines a combination rule of an uplink component carrier and a signal point to which the terminal 200 feeds back a response signal based on the femtocell information.
- constellations are prepared as many as the number of uplink component carriers used for response signal transmission. Then, the reception success / failure pattern in terminal 200 is associated with the signal points of each constellation.
- uplink CC # 0 and uplink CC # 1 are used for transmission of a response signal, two constellations are prepared.
- the number of signal points used for transmitting the response signal in the first constellation is larger than the number of signal points used for transmitting the response signal in the second constellation. That is, the modulation multilevel number corresponding to the first constellation is larger than the modulation multilevel number corresponding to the second constellation.
- a reception success / failure pattern indicating that the downlink packets of all the component carriers have been successfully received is associated with the signal points included in the first constellation.
- the response scheme control unit 101 performs the processing for the uplink CC # 0. While a constellation of 1 is set, a second constellation is set for uplink CC # 1. That is, the response scheme control unit 101 sets the first constellation for the component carrier corresponding to the component carrier to which the high interference tolerance modulation scheme is applied in the femtocell.
- QPSK corresponds to the first constellation
- BPSK corresponds to the second constellation.
- the base station 100 transmits information on the combination rule determined by the response method control unit 101 to the terminal 200.
- information regarding the correspondence patterns between CC # 0 and # 1, and the first constellation and the second constellation is shared in advance between base station 100 and terminal 200 (see FIG. 8). . Therefore, when the base station 100 transmits flag information corresponding to the corresponding pattern to the terminal 200, the terminal 200 can transmit a response signal according to the rule instructed by the base station 100.
- the terminal 200 that has received the information related to the combination rule sets a transmission rule corresponding to the rule, and transmits a response signal based on the transmission rule and the reception success / failure pattern.
- This transmission rule is the same as the above combination rule.
- the response scheme control unit 101 in the base station 100 in response to the interference tolerance of the plurality of uplink component carriers in the femtocell, is the terminal 200 that is in the macro cell covered by the base station 100. Changes the combination rule of uplink component carriers and signal points used for feedback of response signals. Information regarding this combination rule is notified to the terminal 200.
- a constellation that can keep transmission power low can be assigned to an uplink component carrier of a macro cell that overlaps an uplink component carrier with low interference tolerance in the femto cell, thereby reducing interference with the femto cell. Can do.
- the downlink data is transmitted on the two downlink component carriers of the macro cell, and the second of the uplink component carriers of the femto cell corresponding to the two downlink component carriers of the macro cell.
- the number of signal point candidates included in the first constellation associated with the first component carrier of the macro cell is associated with the second component carrier of the macro cell. More than the second constellation to be made.
- a reception success / failure pattern indicating that reception of downlink packets of all component carriers is successfully associated with the signal points included in the first constellation.
- the reception success / failure pattern in which downlink packets are successfully received in all component carriers has a higher probability of occurrence than other patterns. For this reason, the probability used for transmission of the response signal is lower in the second constellation than in the first constellation. That is, since the probability of using the uplink component carrier of the macro cell that overlaps the uplink component carrier having weak interference resistance in the femto cell can be reduced, interference with the femto cell can be reduced.
- control section 217 in terminal 200 changes the combination rule of the uplink component carrier and signal point of the macro cell covered by base station 100 based on information notified from base station 100. Then, the channel selection unit 218 and the modulation units 219 and 220, according to the changed rule, perform the uplink component carrier and signal point of the macro cell according to the reception success / failure pattern of the downlink data transmitted on the plurality of downlink component carriers. A response signal is transmitted to base station 100 using one combination.
- the information notified from the base station 100 described above relates to a combination rule of the uplink component carrier of the macro cell and the signal point determined by the base station 100 based on the interference tolerance of the uplink component carrier of the femto cell. Information.
- the second embodiment is the same as the first embodiment in that the terminal changes the response signal transmission rule based on information notified from the base station.
- terminal 200 receives information related to a combination rule of uplink component carriers and signal points of a macro cell, which is determined by base station 100 based on interference tolerance of uplink component carriers of a femto cell, Based on this information, the response signal transmission rule was changed.
- the terminal changes the transmission rule of the response signal based on the maximum transmission power information for each uplink component carrier of the macro cell transmitted from the base station. That is, the base station of Embodiment 2 does not need to transmit information related to the combination rule described above. For this reason, it is not necessary to add new signaling to the signaling required in the LTE system.
- Base station 100 of Embodiment 2 notifies terminal 200 of information related to the maximum transmission power for each CC.
- This maximum transmission power is controlled by base station 100 according to the allowable interference power in the adjacent cell. That is, as shown in FIG. 9, the maximum transmission power of an uplink component carrier of a macro cell that overlaps with an uplink component carrier having high interference resistance of a femto cell that is a neighboring cell is equal to that of the macro cell that overlaps with an uplink component carrier with low interference resistance of the femto cell. It is set larger than the maximum transmission power of the uplink component carrier.
- the terminal 200 can recognize the relative relationship regarding the interference tolerance between the uplink component carriers in the femtocell by comparing the maximum transmission power for each uplink component carrier notified from the base station 100.
- control section 217 acquires information related to the maximum transmission power for each uplink component carrier included in the downlink control channel. Since the magnitude of the maximum transmission power indicates the magnitude relationship of interference tolerance between uplink component carriers in the femtocell, the control unit 217 uses the uplink component carrier used for feedback of the response signal based on the maximum transmission power for each uplink component carrier. And a combination rule of signal points (that is, a response signal transmission rule) is changed.
- the control unit 217 when the maximum transmission power of CC # 0 is larger than the maximum transmission power of CC # 1 (that is, uplink CC # 0 is higher in the femtocell.
- the interference tolerance is higher than that of CC # 1
- the first constellation is set for uplink CC # 0
- the second constellation is set for uplink CC # 1.
- a first constellation is set for uplink CC # 1, while a second constellation is set for uplink CC # 0.
- the first constellation and the second constellation here are the same as those described in the first embodiment.
- the third embodiment also matches the first embodiment in that the terminal changes the response signal transmission rule based on information notified from the base station.
- the base station changes the combination rule based on the power headroom (PHR) information for each uplink component carrier of the macro cell transmitted from the terminal.
- the terminal changes the transmission rule of the response signal based on the power headroom (PHR) information for each uplink component carrier of the macro cell that is grasped by itself. That is, the base station of Embodiment 3 does not need to transmit information related to the combination rule as in Embodiment 1. For this reason, it is not necessary to add new signaling to the signaling required in the LTE system.
- Terminal 200 of Embodiment 3 notifies base station 100 of information related to power headroom (PHR) information for each CC.
- This power headroom information is a value obtained by subtracting the current transmission power from the maximum transmission power information for each CC notified from the base station 100, and notifies the allowable transmission power amplification amount. That is, as shown in FIG. 11, the power headroom of the uplink component carrier of the macro cell that overlaps the uplink component carrier having high interference resistance of the femto cell that is the adjacent cell is the same as that of the macro component that overlaps the uplink component carrier having low interference resistance of the femto cell. It is set larger than the power headroom of the upstream component carrier.
- the response scheme control unit 101 of the base station 100 when the CC # 0 power headroom is larger than the CC # 1 power headroom (that is, the uplink CC in the femtocell).
- the CC # 0 power headroom is larger than the CC # 1 power headroom (that is, the uplink CC in the femtocell).
- # 0 has higher interference tolerance than uplink CC # 1
- the first constellation is set for uplink CC # 0
- the second constellation is set for uplink CC # 1.
- the first constellation is set for uplink CC # 1
- the second constellation is set for uplink CC # 0.
- the first constellation and the second constellation here are the same as those described in the first embodiment.
- Terminal 200 of Embodiment 3 may change the transmission rule of the response signal based on the maximum transmission power information for each uplink component carrier of the macro cell, as shown in Embodiment 2, or base station 100 As shown in FIG. 12, the transmission rule of the response signal may be changed based on the power headroom (PHR) information for each CC transmitted to
- PHR power headroom
- the probability that a constellation corresponding to each uplink component carrier is used in the response signal transmission rule used by the terminal for transmission of the response signal is equalized.
- the probability that a constellation corresponding to a certain uplink component carrier is used is prominent, and the problem that occurs when this uplink component carrier overlaps with an uplink component carrier having low interference resistance in a femtocell can be solved.
- FIG. 13 is a block diagram showing a configuration of base station 300 according to Embodiment 4.
- the base station 300 includes control information determination units 301 and 302 and a response method control unit 303.
- Control information determination sections 301 and 302 determine control information transmitted on the downlink control channel.
- the control information includes information related to the downlink data channel error rate for each downlink component carrier of the base station 300.
- the information related to the error rate of the downlink data channel for each downlink component carrier of the base station 300 is transmitted on the downlink data channel error rate for each downlink component carrier of the base station 300, and a plurality of downlink component carriers of the base station 300. Or the downlink control channel modulation scheme for each downlink component carrier of the base station 300.
- the control information determination units 301 and 302 output the determined control information to the encoding units 102-1 and 102-2 and the response method control unit 303.
- the control information determination unit 301 determines the control information for CC # 0, while the control information determination unit 302 determines the control information for CC # 1.
- the response scheme control unit 303 determines a combination rule of uplink component carriers and signal points to which a terminal 400 described later feeds back response signals for downlink data transmitted from the base station 300 using a plurality of downlink component carriers.
- the response method control unit 303 determines the rule based on the control information received from the control information determination units 301 and 302.
- FIG. 14 is a block diagram showing a configuration of terminal 400 according to Embodiment 4.
- the terminal 400 includes a control unit 401.
- the control unit 401 controls transmission of a response signal based on information transmitted from the base station 300 and related to the error rate of the downlink data channel for each downlink component carrier. That is, the control unit 401, based on information related to the error rate of the downlink data channel for each downlink component carrier, transmitted from the base station 300, a combination rule of uplink component carriers and signal points used for response signal feedback To change.
- downlink data is transmitted on two downlink component carriers of a macro cell, and the first component carrier (CC # 0) of the two downlink component carriers of the macro cell is transmitted.
- the first component carrier (CC # 0) of the two downlink component carriers of the macro cell is transmitted.
- the second component carrier (CC # 1) Is larger than the error rate of the second component carrier (CC # 1), the number of signal point candidates included in the first constellation associated with the first component carrier of the macro cell is the macro cell. More than the second constellation associated with the second component carrier.
- a reception success / failure pattern indicating that reception of downlink packets of all component carriers is successfully associated with the signal points included in the first constellation.
- the reception success / failure pattern in which the downlink data transmitted on the first component carrier has been successfully received and the downlink data transmitted on the second component carrier has failed to be received is a constant associated with the first component carrier. Are associated with signal points included in the image.
- the reception success / failure pattern in which the downlink data transmitted on the first component carrier has failed to be received and the downlink data transmitted on the second component carrier has been successfully received is a constellation associated with the second component carrier. Corresponding to included signal points.
- the information related to the downlink data channel error rate for each downlink component carrier transmitted from the base station 300 is the downlink data channel error rate for each downlink component carrier of the base station 300, the base station 300 The number of retransmissions of downlink data transmitted on a plurality of downlink component carriers, or the modulation scheme of the downlink control channel for each downlink component carrier of the base station 300.
- the terminal 400 can recognize the magnitude relationship of error rates between downlink component carriers.
- the control unit 401 determines a constellation that includes more signal points than CC # 1. Associate with 0.
- the number of retransmissions of CC # 0 is larger than the number of retransmissions of CC # 1
- a constellation including more signal points than CC # 0 is associated with CC # 1.
- the number of retransmissions is compared, but the total number of transmissions (first time + number of retransmissions) may be compared. Furthermore, in a system with a maximum number of retransmissions of one time, only the first transmission or the retransmission transmission may be compared.
- ⁇ MCS level> In the downlink control channel, control information for demodulating the downlink data channel is notified.
- the MCS of the control channel is set to a low-rate modulation scheme (or coding rate).
- the packet error rate tends to increase. Therefore, the downlink data channel of each downlink component carrier based on the MCS (Modulation and Coding Scheme) level of the control channel of each downlink component carrier (that is, the modulation scheme and coding scheme indicated by the downlink control channel for each downlink component carrier). It is possible to determine the magnitude relationship of the error rate.
- MCS Modulation and Coding Scheme
- the control unit 401 converts a constellation including more signal points than CC # 1 to CC # 1. Associate with 0.
- the MCS level of CC # 0 is higher than the MCS level of CC # 1
- a constellation including more signal points than CC # 0 is associated with CC # 1.
- control channel MCS level information In the LTE standard, information on the number of regions (that is, the number of CCEs) in which the control channels are multiplexed is used instead of the control channel MCS level information (see FIG. 18). This is transmitted with a modulation scheme or coding rate with a lower MCS level as the number of CCEs increases.
- constellation A and constellation B containing fewer signal points than constellation A are prepared in response signal transmission rules used by the terminal for transmission of response signals. Is smaller than the component carrier to which constellation A is associated. Further, the total probability that the signal points included in constellation B are used is larger than the total probability that the signal points included in constellation A are used. Note that the basic configurations of the base station and terminal according to Embodiment 5 are the same as those in Embodiment 4.
- control section 401 controls transmission of a response signal based on information transmitted from base station 300 and related to the downlink data channel error rate for each downlink component carrier. That is, the control unit 401, based on information related to the error rate of the downlink data channel for each downlink component carrier, transmitted from the base station 300, a combination rule of uplink component carriers and signal points used for response signal feedback To change.
- downlink data is transmitted on the two downlink component carriers of the macro cell, and the first component carrier (CC # 0) of the two downlink component carriers of the macro cell is transmitted.
- the number of signal point candidates included in the first constellation associated with the first component carrier of the macro cell is the macro cell. More than the second constellation associated with the second component carrier.
- the signal points included in the second constellation are associated in order from the reception success / failure pattern with a high probability of occurrence. That is, in FIG. 19, a reception success / failure pattern in which downlink data has been successfully received in CC # 0 and CC # 1, and reception success in which downlink data has failed to be received in CC # 0 and downlink data has been successfully received in CC # 1.
- the probability of pattern occurrence is high. Accordingly, both patterns are associated with signal points of the second constellation (BPSK constellation in FIG. 19).
- the probability of PDCCH reception miss (DTX) is set to 0 in order to simplify the calculation.
- the base station 100 notifies the terminal 200 of information related to the correspondence pattern between CCs and constellations, but the present invention is not limited to this. You may notify the identification information of CC used when the reception success / failure pattern has succeeded in receiving downlink data in all CCs. This is because only the reception success / failure pattern in which downlink data has been successfully received by all CCs may be transmitted by any CC. Alternatively, the number of signal points between constellations may be notified. Moreover, these notifications may be performed for each terminal 200 or may be performed for the entire cell.
- the terminal 200 close to the femtocell may follow the instruction by the above notification, and the other terminals 200 may transmit a response signal using a constellation corresponding to QPSK with a predetermined random CC. This is to prevent PUCCH from being concentrated when all terminals 200 performing channel selection transmit response signals using constellations corresponding to QPSK in the same CC when notifying the entire cell. Further, even when Bundling (logical product of ACK / NACK) is used instead of channel selection, it is possible to similarly reduce interference to the femtocell by notifying the CC that transmits the Bundling PUCCH.
- Bundling logical product of ACK / NACK
- Embodiment 1 the number of component carriers has been described as two, but the present invention is not limited to this. Even when the number of component carriers is three or more, the same implementation as in the first embodiment is possible by notifying the number of signal points between constellations.
- each of the base station 300 and the terminal 400 determines whether the error rate between component carriers is large or small, but the present invention is not limited to this.
- the base station 300 may make the determination and notify the terminal 400 of the determination result included in the control information.
- the occurrence probability of ACK and NACK is the same, the occurrence probability of the ACK / ACK signal point (QPSK) is high. For this reason, in order to distribute CC transmitted using the constellation corresponding to QPSK for each terminal 400, a method of notifying the terminal 400 of the CC transmitted using the constellation corresponding to QPSK is effective. It is.
- the maximum transmission power (Pmax) of Embodiment 2 is the maximum value that can be transmitted by the terminal 200, it is not limited to this.
- the transmission power for each downlink CC of the base station 100 is exchanged between the base station 100 and the terminal 200, and in the uplink CC corresponding to the downlink CC having a large transmission power, the terminal 200 performs a constellation corresponding to QPSK.
- the response signal may be transmitted by using it.
- Embodiments 1 to 3 the constellation at the time of PUCCH channel selection of a terminal communicating with a macro cell base station adjacent to the femto cell has been described. However, it is not limited to this, the cell sizes between adjacent cells are relatively compared, and each base station considers the relative relationship regarding the size of interference between adjacent cells, and the PUCCH You may judge about the constellation at the time of channel selection. That is, when there is clearly no definition of a femto cell or a macro cell, it is possible to select an optimal constellation in consideration of interference resistance against inter-cell interference power.
- a terminal communicating with a femtocell base station adjacent to a macro cell can improve reception characteristics at the time of channel selection by notifying the constellation at the time of PUCCH channel selection from the femtocell base station.
- the second constellation associated with the second component carrier having lower interference tolerance than the constellation associated with the component carrier having higher interference tolerance in the femtocell. More.
- 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 made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as 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 base station, base station, terminal, retransmission control method, and response method of the present invention are useful as those capable of preventing deterioration of reception characteristics of nearby cells when carrier aggregation and channel selection are applied. is there.
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Abstract
Description
[システムの概要]
後述する基地局100及び端末200を含む通信システムでは、複数の上りコンポーネントキャリア及び当該複数の上りコンポーネントキャリアと対応づけられた複数のコンポーネントキャリアを使用した通信、つまり、Carrier aggregationによる通信が行われる。
図5は、本発明の実施の形態1に係る基地局100の構成を示すブロック図である。図5において、基地局100は、応答方式制御部101と、符号化部102,103,104と、データ送信制御部105,106と、変調部107,108,109と、直並列変換部(S/P)110,111,112と、多重部113と、IFFT部114と、CP付加部115と、無線送信部116と、無線受信部117と、CP除去部118と、DFT部119と、分離部120と、チャネル補償部121,122と、IDFT部123,124と、復調部125,126と、チャネルセレクション判定部127とを有する。
図6は、本発明の実施の形態1に係る端末200の構成を示すブロック図である。図6において、端末200は、無線受信部201と、CP除去部202と、FFT部203と、チャネル補償部204と、分離部205と、並直列変換部(P/S)206,207,208と、復調部209,210,211と、復号部212,213,214と、誤り判定部215,216と、制御部217と、チャネルセレクション部218と、変調部219,220と、DFT部221,222と、多重部223と、IDFT部224と、CP付加部225と、無線送信部226とを有する。
次に、基地局100における、上記した上りコンポーネントキャリアと信号点との組み合わせルールの決定方法、及び、端末200における応答信号の送信ルールの設定方法について説明する。
実施の形態2は、端末が、基地局から通知される情報に基づいて、応答信号の送信ルールを変更する点では、実施の形態1と一致する。ただし、実施の形態1では、端末200は、基地局100によってフェムトセルの上りコンポーネントキャリアの干渉耐性に基づいて決定された、マクロセルの上りコンポーネントキャリアと信号点との組み合わせルールに関する情報を受信し、当該情報に基づいて、応答信号の送信ルールを変更した。これに対して、実施の形態2では、端末は、基地局から送信される、マクロセルの上りコンポーネントキャリア毎の最大送信電力情報に基づいて、応答信号の送信ルールを変更する。すなわち、実施の形態2の基地局は、上記した組み合わせルールに関する情報を送信する必要がない。このため、LTEシステムで必要とされているシグナリングに対して、新たなシグナリングを追加する必要がない。
実施の形態3も、端末が、基地局から通知される情報に基づいて、応答信号の送信ルールを変更する点では、実施の形態1と一致する。ただし、実施の形態3では、基地局は、端末から送信される、マクロセルの上りコンポーネントキャリア毎のパワーヘッドルーム(PHR)情報に基づいて、上記組み合わせルールを変更する。また、端末は、自機で把握しているマクロセルの上りコンポーネントキャリア毎のパワーヘッドルーム(PHR)情報に基づいて、応答信号の送信ルールを変更する。すなわち、実施の形態3の基地局は、実施の形態1のように上記組み合わせルールに関する情報を送信する必要がない。このため、LTEシステムで必要とされているシグナリングに対して、新たなシグナリングを追加する必要がない。
実施の形態4では、端末が応答信号の送信に用いる応答信号送信ルールにおいて、各上りコンポーネントキャリアと対応するコンスタレーションが用いられる確率を平準化する。これにより、或る上りコンポーネントキャリアと対応するコンスタレーションが用いられる確率が突出し、この上りコンポーネントキャリアがフェムトセルにおける干渉耐性の低い上りコンポーネントキャリアと重なる場合に生じる問題を解消することができる。
HARQが採用される場合、通常、データチャネルの初回送信時の変調方式、符号化率は、パケット誤り率が0.1(ACK=0.9、 NACK=0.1)程度となるように設定される。そして、データチャネルの再送時のパケット誤り率は、再送パケットによる受信品質の改善によって、前回送信時に比べて改善する。従って、各下りコンポーネントキャリアの再送回数に基づいて、各下りコンポーネントキャリアの誤り率の大小関係を判断することができる。
下り制御チャネルでは、下りデータチャネルを復調するための制御情報が通知される。セル間干渉電力が大きい場合には、制御チャネルのMCSは、低レートの変調方式(又は、符号化率)に設定される。そして、セル間干渉電力が大きい場合には、パケット誤り率が増大する傾向がある。従って、各下りコンポーネントキャリアの制御チャネルのMCS(Modulation and Coding Scheme)レベル(つまり、下りコンポーネントキャリア毎の下り制御チャネルの示す変調方式、符号化方式)に基づいて、各下りコンポーネントキャリアの下りデータチャネルの誤り率の大小関係を判断することができる。
実施の形態5では、端末が応答信号の送信に用いる応答信号送信ルールにおいて、コンスタレーションAと、コンスタレーションAよりも含んでいる信号点の数が少ないコンスタレーションBとが用意され、コンスタレーションBが対応付けられるコンポーネントキャリアの誤り率は、コンスタレーションAが対応づけられるコンポーネントキャリアよりも小さい。また、コンスタレーションBに含まれる信号点が用いられる確率の合計は、コンスタレーションAに含まれる信号点が用いられる確率の合計よりも大きい。なお、実施の形態5に係る基地局及び端末の基本構成は、実施の形態4と共通する。
(1)実施の形態1では、CCとコンスタレーションとの対応パターンに関する情報を基地局100が端末200へ通知しているが、これに限定されない。全てのCCで下りデータの受信に成功した受信成否パターンのときに用いられるCCの識別情報を通知しても良い。これは、全てのCCで下りデータの受信に成功した受信成否パターンのみが、いずれのCCで送信されても良いためである。
又は、コンスタレーション間における、信号点の数の多少を通知しても良い。
また、これらの通知は、端末200毎に行われても良いし、セル全体に行われても良い。
さらに、フェムトセルから近い端末200のみが、上記の通知による指示に従い、それ以外の端末200は予め決められたランダムなCCでQPSKに対応するコンスタレーションを使って応答信号を送信しても良い。これは、セル全体に通知する場合には、チャネルセレクションする全端末200が同一のCCでQPSKに対応するコンスタレーションを用いて応答信号を送信するでPUCCHが集中することを防止するためである。
また、チャネルセレクションの代わりとして、Bundling(ACK/NACKの論理積)する場合でも、BundlingのPUCCHを送信するCCを通知することで、同様にフェムトセルへの干渉を低減できる。
また、マクロセルに隣接するフェムトセル基地局と通信をしている端末においても、フェムトセル基地局からPUCCHのチャネルセレクション時のコンスタレーションを通知することで、チャネルセレクション時の受信特性を向上できる。この場合のコンスタレーションに含まれる信号点候補の数については、フェムトセルにおける干渉耐性が高いコンポーネントキャリアに対応付けられるコンスタレーションよりも、干渉耐性が低い第2コンポーネントキャリアに対応付けられる第2のコンスタレーションの方が多い。
101,303 応答方式制御部
102,103,104 符号化部
105,106 データ送信制御部
107,108,109,219,220 変調部
110,111,112 直並列変換部
113,223 多重部
114 IFFT部
115,225 CP付加部
116,226 無線送信部
117,201 無線受信部
118,202 CP除去部
119,221,222 DFT部
120,205 分離部
121,122,204 チャネル補償部
125,126,209,210,211 復調部
127 チャネルセレクション判定部
200,400 端末
203 FFT部
206,207,208 並直列変換部
212,213,214 復号部
215 誤り判定部
216 判定部
217,401 制御部
218 チャネルセレクション部
224 IDFT部
301,302 制御情報決定部
Claims (14)
- 複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、前記複数のコンポーネントキャリアで送信される下りデータに対する応答信号を端末がフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更する制御手段と、
前記変更された組み合わせルール情報に対応するコンポーネントキャリア候補と信号点候補との組み合わせを用いて受信処理し、処理結果を出力する受信手段と、
前記処理結果に基づいて前記応答信号のフィードバックに用いられた、前記コンポーネントキャリア候補と前記信号点候補との組み合わせを特定する特定手段と、
を具備する基地局。 - 前記干渉耐性に関するパラメータは、各コンポーネントキャリアの干渉耐性、各コンポーネントキャリアの最大送信電力、各コンポーネントキャリアのパワーヘッドルーム値、各コンポーネントキャリアの下りデータチャネルの誤り率、前記複数のコンポーネントキャリアで送信される下りデータの再送回数、又は、各コンポーネントキャリアの下り制御チャネルの示す変調方式若しくは符号化方式である、
請求項1に記載の基地局。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで送信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数よりも多い、
請求項1に記載の基地局。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで送信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計よりも大きい、
請求項1に記載の基地局。 - 複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、前記複数のコンポーネントキャリアで送信される下りデータに対する応答信号を端末がフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更する制御手段と、
前記複数のコンポーネントキャリアの下りデータと、前記組み合わせルールを示す情報を端末へ送信する送信手段と、
を具備する基地局。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで送信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数よりも多い、
請求項5に記載の基地局。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで送信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計よりも大きい、
請求項5に記載の基地局。 - 複数のコンポーネントキャリアで下りデータを受信する受信手段と、
前記複数のコンポーネントキャリアで受信された下りデータに対する応答信号をフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更する制御手段と、
前記変更された組み合わせルールに基づいて、前記応答信号を基地局へ送信する送信手段と、
を具備し、
前記制御手段は、前記基地局によって前記複数のコンポーネントキャリアの干渉耐性に基づいて決定された前記組み合わせルールを示す情報、又は、複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、前記組み合わせルールを変更する、
端末。 - 前記干渉耐性に関するパラメータは、各コンポーネントキャリアの干渉耐性、各コンポーネントキャリアの最大送信電力、各コンポーネントキャリアのパワーヘッドルーム値、各コンポーネントキャリアの下りデータチャネルの誤り率、前記複数のコンポーネントキャリアで送信される下りデータの再送回数、又は、各コンポーネントキャリアの下り制御チャネルの示す変調方式若しくは符号化方式である、
請求項8に記載の端末。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで受信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補の数よりも多い、
請求項8に記載の端末。 - 前記制御手段によって変更された組み合わせルールでは、
前記下りデータが2つのコンポーネントキャリアで受信され、且つ、前記複数セルの内の第1セルの前記2つのコンポーネントキャリアの第1コンポーネントキャリアが第2コンポーネントキャリアよりも干渉耐性が高い場合、
前記第1セルと異なる第2セルの前記第1コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計は、前記第2セルの前記第2コンポーネントキャリアに対応付けられるコンスタレーションに含まれる信号点候補が利用される確率の合計よりも大きい、
請求項8に記載の端末。 - 複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、前記複数のコンポーネントキャリアで基地局から送信される下りデータに対する応答信号を端末がフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更するステップと、
前記変更された組み合わせルール情報に対応するコンポーネントキャリア候補と信号点候補との組み合わせを用いて受信処理するステップと、
前記受信処理の結果に基づいて前記応答信号のフィードバックに用いられた、前記コンポーネントキャリア候補と前記信号点候補との組み合わせを特定するステップ、
を具備する再送制御方法。 - 複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、前記複数のコンポーネントキャリアで基地局から送信される下りデータに対する応答信号を端末がフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更するステップと、
前記複数のコンポーネントキャリアの下りデータと、前記組み合わせルールを示す情報を端末へ送信する送信ステップと、
を具備する再送制御方法。 - 複数のコンポーネントキャリアで受信された下りデータに対する応答信号をフィードバックするコンポーネントキャリアと信号点との組み合わせルールを変更するステップと、
前記変更された組み合わせルールに基づいて、前記応答信号を基地局へ送信するステップと、
を具備し、
前記組み合わせルールは、前記基地局によって前記複数のコンポーネントキャリアの干渉耐性に基づいて決定された前記組み合わせルールを示す情報、又は、複数セル間の複数のコンポーネントキャリアの干渉耐性に関するパラメータに基づいて、変更される、
応答方法。
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WO2013053339A3 (zh) * | 2011-10-14 | 2013-06-06 | 华为技术有限公司 | 传输速率控制方法、移动性管理实体和通讯系统 |
JP2014522212A (ja) * | 2011-08-12 | 2014-08-28 | インターデイジタル パテント ホールディングス インコーポレイテッド | 電力制御およびタイミングアドバンスのための方法、装置、およびシステム |
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CN110463107B (zh) * | 2017-04-28 | 2022-11-15 | 富士通株式会社 | 终端装置、基站装置、无线通信系统及终端装置控制方法 |
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