WO2009087743A1 - 無線送信装置及び無線送信方法 - Google Patents
無線送信装置及び無線送信方法 Download PDFInfo
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- WO2009087743A1 WO2009087743A1 PCT/JP2008/004009 JP2008004009W WO2009087743A1 WO 2009087743 A1 WO2009087743 A1 WO 2009087743A1 JP 2008004009 W JP2008004009 W JP 2008004009W WO 2009087743 A1 WO2009087743 A1 WO 2009087743A1
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
- H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
- H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling
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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
- H04L2001/0098—Unequal error protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- 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
- H04W88/02—Terminal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a wireless transmission device and a wireless transmission method used in a communication system employing an adaptive modulation scheme.
- downlink CQI information and downlink ACK / NACK information are transmitted on the control channel in the uplink.
- FIG. 1 shows an MCS table (hereinafter referred to as “CQI table”) used by a terminal for adaptive modulation of a data channel (for example, see Non-Patent Document 1).
- CQI table used by a terminal for adaptive modulation of a data channel
- various modulation schemes and coding rates are read from the table shown in FIG. 1 based on CQI values, that is, channel quality information such as SNR, and the MCS of the data channel is determined. .
- the data channel and the control channel in the uplink are transmitted in the same frame.
- the MCS of the control channel uses the CQI that determines the MCS of the data channel, and the MCS of the data channel. It is determined simultaneously (for example, refer nonpatent literature 2).
- FIG. 2 is a diagram showing a specific example of the CQI table showing the relative relationship between the SE of the data channel and the SE of the control channel. Hybrid ARQ is not applied to this control channel. Therefore, the SE of the control channel is set to be robust with respect to each CQI, that is, to have a low SE so as to satisfy the required quality even when the reception environment is poor.
- the SE read from the table sufficiently satisfies the required quality of the control channel, and uses unnecessary radio resources for the control channel. As a result, there is a problem that the throughput of the data channel is lowered.
- An object of the present invention is to provide a wireless transmission device and a wireless transmission method that improve the throughput of a data channel.
- the wireless transmission device of the present invention is determined as MCS selection means for switching the correspondence relationship between CQI and MCS according to the parameters of the wireless communication terminal device and determining the MCS of the control channel based on the correspondence relationship after switching. And a coding modulation means for coding and modulating the control data by the MCS.
- the throughput of the data channel can be improved.
- the figure which shows the CQI table which a terminal uses for the adaptive modulation etc. of a data channel The figure which shows the specific example of the CQI table which showed the relative relationship of SE of data channel and SE of control channel Diagram showing how data and control channels are multiplexed and transmitted in the same frame
- the figure which shows the relationship between reception SNR and SE when required BLER of a data channel is 10%
- the figure which shows the relationship between reception SNR and SE in case the required BER of ACK / NACK is 0.01% 1 is a block diagram showing a configuration of a wireless communication terminal apparatus according to Embodiment 1 of the present invention.
- the figure which shows an example of the CQI table for control channels The figure which shows the other example of the CQI table for control channels
- the figure which shows an example of an offset reference table The figure which shows an example of the CQI table for control channels
- FIG. 4 shows the relationship between the received SNR and SE (Spectral Efficiency) when the required BLER of the data channel obtained from the simulation result is 10%.
- FIG. 5 shows the relationship between the received SNR and SE when the required BER of ACK / NACK that is the control channel is 0.01%.
- the received SNR difference between AWGN performance and no frequency hopping is 5 dB for the data channel, whereas it is 9 dB for the control channel. It pays attention to the point which has deteriorated greatly. That is, attention is focused on the fact that the performance of the data channel and the performance of the control channel are greatly different under certain conditions.
- FIG. 6 is a block diagram showing a configuration of the radio communication terminal apparatus according to Embodiment 1 of the present invention.
- Radio receiving section 102 converts a signal received via antenna 101 into a baseband signal and outputs the baseband signal to CP removing section 103.
- CP removing section 103 removes the CP (Cyclic Prefix) of the baseband signal output from radio receiving section 102 and outputs the obtained signal to FFT section 104.
- FFT section 104 performs FFT (Fast Fourier Transform) on the time domain signal output from CP removing section 103, and outputs the obtained frequency domain signal to transmission path estimation section 105 and demodulation section 106. .
- FFT Fast Fourier Transform
- the transmission path estimation unit 105 estimates the transmission path environment of the received signal using the pilot signal included in the signal output from the FFT unit 104, and outputs the estimation result to the demodulation unit 106.
- Demodulation section 106 estimates the transmission path environment output from transmission path estimation section 105 for the signal from which control information such as the pilot signal is removed from the received signal output from FFT section 104, that is, data information. Transmission path compensation is performed based on the result. Demodulation section 106 performs demodulation processing on the signal after transmission path compensation based on the same MCS used by the base station of the communication counterpart and outputs the signal to decoding section 107.
- the decoding unit 107 performs error correction on the demodulated signal output from the demodulating unit 106, and extracts an information data string, CQI information, and bandwidth information from the received signal.
- the CQI information and the bandwidth information are output to the MCS selection unit 108.
- the MCS selection unit 108 includes a CQI table to be described later, reads an MCS pattern corresponding to the CQI information output from the decoding unit 107 from the CQI table, and determines the read MCS pattern as the MCS (MCS1) of the data channel. Further, the MCS selection unit 108 refers to a plurality of CQI tables described later, and determines the MCS pattern (MCS2) of the control channel based on the CQI information and the bandwidth information output from the decoding unit 107. The determined MCS1 is output to the encoding modulation unit 109, and MCS2 is output to the encoding modulation unit 110.
- the encoding and modulation unit 109 performs encoding and modulation processing on input user data (transmission data string) based on MCS1 output from the MCS selection unit 108, and generates transmission data of a data channel.
- the generated transmission data of the data channel is output to channel multiplexing section 111.
- the encoding modulation unit 110 performs encoding and modulation processing on the input control data based on the MCS2 output from the MCS selection unit 108, and generates transmission data of the control channel.
- the generated transmission data of the control channel is output to channel multiplexing section 111.
- the channel multiplexing unit 111 time-division multiplexes the transmission data of the data channel output from the encoding modulation unit 109 and the control channel output from the encoding modulation unit 110.
- the multiplexed transmission data is output to the DFT-s-OFDM unit 112.
- the DFT-s-OFDM unit 112 performs discrete Fourier transform (DFT) on the transmission data output from the channel multiplexing unit 111, and performs time-frequency conversion on the frequency component data to obtain a frequency domain signal. Then, after mapping the frequency domain signal to the transmission subcarrier, IFFT (Inverse Fast Fourier Transform) processing is performed to convert it into a time domain signal. The obtained time domain signal is output to CP adding section 113.
- DFT discrete Fourier transform
- IFFT Inverse Fast Fourier Transform
- the CP adding unit 113 adds a CP to the transmission data sequence by duplicating the data at the end of the frame and adding it to the head of the frame in each frame of the transmission data sequence output from the DFT-s-OFDM unit 112.
- the data is output to the wireless transmission unit 114.
- the radio transmission unit 114 converts the baseband signal output from the CP addition unit 113 to a radio frequency band, and transmits it through the antenna 101.
- FIG. 7 is a block diagram showing an internal configuration of the MCS selection unit 108 shown in FIG.
- the table selection MCS determination unit 201 refers to the CQI table for the corresponding bandwidth in the control channel CQI table shown in FIG. 8 and determines the MCS2 of the control channel based on the input CQI.
- the MCS determination unit 202 refers to the data CQI table and determines the MCS1 of the data channel based on the input CQI.
- FIG. 8 is a diagram showing an example of the CQI table for the control channel.
- the CQI table when the bandwidth is 500 kHz or less is Table 1
- the CQI table when the bandwidth is greater than 500 kHz is Table 2.
- the SE in the same CQI is set lower than that in Table 2.
- the bandwidth is as narrow as 500 kHz, that is, when the frequency diversity effect is small, a lower SE is selected.
- an SE higher than the SE of Table 1 is selected. Therefore, when the frequency diversity effect is large, the required quality of the control channel can be satisfied with fewer control channel resources than when the frequency diversity effect is small, so the amount of resources used for the data channel is increased. It becomes possible.
- Embodiment 1 when data channels and control channels are multiplexed and adaptive modulation is applied to both channels, one data channel CQI table and a plurality of control channel CQI tables are It is possible to determine the MCS appropriate for the bandwidth by switching the plurality of tables according to the transmission bandwidth of the terminal and determining the MCS of the control channel, and appropriately setting the radio resources used for the control channel.
- the radio resources used for the data channel can be increased. Thereby, the throughput of the data channel can be improved.
- the CQI table is selected based only on the transmission bandwidth. However, as shown in FIG. 9, in addition to the bandwidth, four CQIs are combined with the data channel scheduling method. A table may be selected. If persistent scheduling is used for the data channel, a lower CQI is signaled to make the data channel MCS robust. In that case, considering the CQI difference between two types of scheduling, normal scheduling (dynamic scheduling) and persistent scheduling, a configuration having a plurality of CQI tables for the control channel, and appropriate control channel MCS and used resources Thus, the amount of resources used for the data channel can be increased.
- Embodiment 2 Since the structure of the radio
- FIG. 10 is a block diagram showing an internal configuration of MCS selection section 108 according to Embodiment 2 of the present invention.
- the CQI offset MCS determination unit 301 calculates the control channel CQI using the offset reference table, the CQI information, and Equation (1) shown in FIG.
- Control channel CQI CQI + ⁇ offset [condition] (1)
- the CQI offset MCS determining unit 301 refers to the control channel CQI table shown in FIG. 12 and determines the control channel MCS2 based on the control channel CQI.
- FIG. 11 is a diagram illustrating an example of the offset reference table.
- the offset is set to 0 when the data channel scheduling method is dynamic scheduling, and the offset is set to 2 when persistent scheduling is used.
- an offset is given in consideration of the CQI difference between two types of scheduling, normal scheduling (dynamic scheduling) and persistent scheduling.
- the offset is 0 when frequency hopping of the data channel is present, and the offset is -4 when the bandwidth is 1 RB (resource block) without frequency hopping.
- Intra-frame frequency hopping is not applied, and an offset is provided to select a lower MCS when the frequency diversity effect is small, such as narrow band transmission. This is because the control channel has a relatively small number of bits to be transmitted and it is difficult to obtain a gain by encoding. Considering the above reasons, an offset due to the bandwidth is provided.
- the offset is 0, and when it is retransmission, the offset is -2.
- the reception quality is worse than expected. In such a case, the reception quality of the control channel may be degraded, so a lower MCS is selected.
- An offset is provided so that it can be done.
- FIG. 12 is a diagram showing an example of the CQI table for the control channel.
- a low SE when the CQI is ⁇ 10 to ⁇ 1 and a high SE when the CQI is 31 to 37 are newly set.
- the low SE region is mainly used when the offset is negative
- the high SE region is mainly used when the offset is positive.
- the CQI table for one data channel and the CQI table for the data channel Using a CQI table for one continuous control channel configured with a large size and an offset reference table made up of terminal parameters, the CQI obtained by adding the total offset amount read from the offset reference table to the CQI of the data channel, By determining the MCS of the control channel, an increase in memory can be suppressed and the throughput of the data channel can be improved.
- FIG. 13 is a CQI table according to Embodiment 3 of the present invention, and the setting range of the basic table can be expanded or reduced by multiplying Equation (1) by the magnification (N).
- the control channel CQI is calculated using equation (2).
- Control channel CQI floor (N ⁇ (CQI + ⁇ offset [condition])) (2)
- N is a decimal number.
- the MCS can be referred from the same CQI table.
- control channel CQI to which the total offset amount is added is multiplied by the multiplication factor, thereby calculating a new control channel CQI and determining the MCS of the control channel.
- FIG. 14 is a CQI table according to the fourth embodiment of the present invention, and is calculated using the equation (2) shown in the third embodiment.
- N is a decimal number
- N N_A (CQI ⁇ CQI_TH)
- N N_B (CQI> CQI_TH).
- the MCS can be determined with higher accuracy by changing the magnification (N) according to the size of the CQI.
- the control channel CQI to which the total offset amount is added is multiplied by the magnification, the magnification is changed according to the size of the CQI, the control channel CQI is calculated, and the MCS of the control channel is calculated.
- the first-order linear processing of multiplying N has been described, but higher-order linear processing may be used.
- (Drop) may be included so that the control channel is not transmitted to the lowest SE (MCS) in the CQI table of the control channel.
- the SE (MCS) at both ends of the CQI table may be used, or may be obtained by extrapolation.
- 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.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- 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 radio transmission apparatus and radio transmission method according to the present invention can improve the throughput of a data channel and can be applied to, for example, a mobile communication system.
Abstract
Description
R1-073344, Nokia,"Update to 64QAM CQI tables" , 3GPP TSG RAN WG1 Meeting #50 , Athens, Greece, August 20-24, 2007 3GPP TS36.212 V8.0.0
図6は、本発明の実施の形態1に係る無線通信端末装置の構成を示すブロック図である。以下、図6を参照して無線通信端末装置の構成について説明する。無線受信部102は、アンテナ101を介して受信した信号をベースバンド信号に変換し、CP除去部103に出力する。
本発明の実施の形態2に係る無線通信端末装置の構成は、実施の形態1の図6に示した構成と同様であるので、図6を援用し、重複する説明は省略する。
制御チャネル用CQI=CQI+Σオフセット[条件] …(1)
図13は、本発明の実施の形態3に係るCQIテーブルであり、式(1)に倍率(N)を乗算することにより、基本テーブルの設定範囲を拡大あるいは縮小することができる。制御チャネル用CQIは、式(2)を用いて算出される。
制御チャネル用CQI=floor(N×(CQI+Σオフセット[条件]))…(2)
ここで、Nは小数である。
図14は、本発明の実施の形態4に係るCQIテーブルであり、実施の形態3に示した式(2)を用いて算出される。ただし、Nは小数であり、N=N_A(CQI<CQI_TH)、N=N_B(CQI>CQI_TH)とする。図14は、具体的には、CQI_TH=3、N_A=0.7、N_B=1.3の場合を示している。このように、CQIの大きさによって倍率(N)を変えることにより、より精度よくMCSを決定することができる。
Claims (11)
- 無線通信端末装置のパラメータに応じて、CQIとMCSとの対応関係を切り替え、切り替え後の対応関係に基づいて制御チャネルのMCSを決定するMCS選択手段と、
決定されたMCSによって制御データを符号化及び変調する符号化変調手段と、
を具備する無線送信装置。 - 前記MCS選択手段は、複数のCQIテーブルを備え、前記パラメータに応じて、前記複数のCQIテーブルを切り替え、切り替えたCQIテーブルを用いて制御チャネルのMCSを決定する請求項1記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータとオフセット値とが対応付けられたオフセットテーブルを備え、該当する前記パラメータに対応するオフセット値を全て加算したCQIに基づいて、制御チャネルのMCSを決定する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータに対応するオフセット値を全て加算したCQIに倍率を乗算して求めた新たなCQIに基づいて、制御チャネルのMCSを決定する請求項2に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータが送信帯域幅であり、送信帯域幅が狭いほど、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルのスケジューリング方法であり、パーシステントスケジューリングの場合にはより高いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルの送信方法であり、フレーム内周波数ホッピングが適用されず、かつ、送信帯域幅が狭い場合、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルの再送回数であり、再送回数が多いほど、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータに対応するオフセット値を全て加算したCQIに乗算する倍率をCQIの大きさに応じて制御する請求項4に記載の無線送信装置。
- 前記MCS選択手段は、データチャネルのMCSを決定する場合は前記パラメータに応じてCQIとMCSの対応関係を切り替えない請求項1に記載の無線送信装置。
- 無線通信端末装置のパラメータに応じて、CQIとMCSの対応関係を切り替える切り替えステップと、
切り替えた後の対応関係に基づいて、制御チャネルのMCSを決定するMCS選択ステップと、
決定されたMCSによって制御データを符号化及び変調する符号化変調ステップと、
を具備する無線送信方法。
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