WO2005046152A1 - 無線通信装置及びmcs決定方法 - Google Patents
無線通信装置及びmcs決定方法 Download PDFInfo
- Publication number
- WO2005046152A1 WO2005046152A1 PCT/JP2004/015790 JP2004015790W WO2005046152A1 WO 2005046152 A1 WO2005046152 A1 WO 2005046152A1 JP 2004015790 W JP2004015790 W JP 2004015790W WO 2005046152 A1 WO2005046152 A1 WO 2005046152A1
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- WIPO (PCT)
- Prior art keywords
- mcs
- mcs level
- level
- determined
- fluctuation range
- Prior art date
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Classifications
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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
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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
-
- 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
-
- 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
Definitions
- the present invention relates to a radio communication device that performs AMC (Adaptive Modulation and Channel Coding) control and an MCS determination method.
- AMC Adaptive Modulation and Channel Coding
- Patent Document 1 it has been widely known that a modulation scheme is adaptively determined according to a propagation path condition, and communication is performed using the determined modulation scheme.
- Non-Patent Document 1 describes the adaptive modulation and demodulation in HSD PA (High Speed Downlink Packet Access), which is this downlink high-speed packet transmission system, and the throughput characteristics of error correction coding and hybrid ARQ.
- HSD PA High Speed Downlink Packet Access
- AMC improves the transmission rate by applying a faster modulation scheme and an error correction code having a higher coding rate as the propagation environment becomes better.
- the communication terminal device estimates the state of the propagation path of the downlink for each frame, and notifies the base station device of the estimation result. Then, the base station apparatus determines an optimal modulation scheme and coding rate based on the estimation result, and performs packet transmission.
- MCS Modulation and Coding Scheme
- the combination of a low M-ary modulation scheme and low, the combination of a coding rate and a low MCS level is high, the combination of a multi-level modulation scheme and a high coding rate, and the combination of coding rates has a high MCS level !.
- the modulation scheme used for MCS is, for example, four types: QPSK, 8PSK, 16QAM, and 64QAM. Is, for example, between 1Z3-1 using rate matching.
- the throughput characteristics are affected by the determination of the MCS level and the determination method, and the estimation accuracy of the channel quality.
- Patent Document 1 JP-A-7-250116
- Non-Patent Document 1 T. Asai, K. higuchi, and M. Sawahashi 'Experimental Evaluations on Throughput Performance of Adaptive Modulation and Channel Coding and Hybrid ARQ in HSDPA, "TECHNICAL REPORT OF IEICE RCS 2002-178 (2002-10). Disclosure
- An object of the present invention is to provide a wireless communication apparatus and an MCS determination method that improve throughput even when the variance of channel quality estimation values is large because the accuracy of channel quality estimation is low.
- a wireless communication apparatus includes: an encoding unit that encodes transmission data at a changeable encoding rate; a modulation unit that modulates by any one of a plurality of modulation systems;
- the provisionally determined MCS level is compared with the MCS level used in the previous control, and the level difference is within the fluctuation range. If the level difference exceeds the fluctuation range while the provisionally obtained MCS level is determined, the MCS level in which the level difference from the MCS level used in the previous control is limited to the fluctuation range is determined, The determined MCS level
- a configuration including a control unit that controls the encoding unit and the modulation unit is adopted.
- the provisionally determined MCS level is determined. If the level difference exceeds a predetermined fluctuation range, the MCS level in which the level difference with respect to the MCS level used in the previous control is limited to the predetermined fluctuation range is determined, so that the fluctuation of the MCS level is moderated. Therefore, since the estimation accuracy of the channel quality is low, even when the variance of the estimated channel quality is large, the MCS according to the actual channel quality is used, so that the throughput can be improved. In addition, since the MCS level can be determined quickly, control delay can be reduced.
- the provisionally obtained MCS level is used in the current control. If the MCS level is determined and the level difference exceeds a predetermined fluctuation range, the MCS level in which the level difference from the MCS level in the previous control is limited to the predetermined fluctuation range is determined as the MCS level in the current control. In addition, even when the variance of the channel quality estimation value is large, the throughput can be improved.
- FIG. 1 shows a configuration of a wireless communication apparatus according to Embodiment 1 of the present invention.
- FIG. 2 shows an internal configuration of an MCS control unit according to the first embodiment of the present invention.
- FIG. 3 shows an MCS table according to the first embodiment of the present invention.
- FIG. 6 shows a configuration of a transmitting apparatus according to Embodiment 2 of the present invention.
- FIG. 1 is a block diagram showing a configuration of a wireless communication device according to Embodiment 1 of the present invention.
- turbo encoder 101 turbo-encodes transmission data and outputs an encoded signal to rate matching section 103.
- MCS control section 102 determines the MCS based on an SIR (Signal to Interference Ratio) value that is an estimated channel quality value, and controls rate matching section 103 and modulation section 105. Details of the MCS control unit 102 will be described later.
- SIR Signal to Interference Ratio
- Rate matching section 103 performs rate matching processing on the signal output from turbo encoder 101 so that the MCS determined by MCS control section 102 is obtained, and outputs the signal after rate matching to interleaver 104.
- Output to Interleaver 104 rearranges the sequence of the signal output from rate matching section 103 according to a predetermined pattern (interleaving), and outputs the interleaved signal to modulating section 105.
- the turbo encoder 101 and the rate matching unit 103 function as coding means.
- Modulating section 105 modulates the signal output from interleaver 104 with one of QPSK, 8PSK, 16QAM, and 64QAM under the control of MCS control section 102, and outputs the modulated signal to transmission processing section 106.
- Transmission processing section 106 performs predetermined transmission processing on the signal output from modulation section 105 and transmits the signal to a communication partner via antenna 107.
- FIG. 2 is a block diagram showing an internal configuration of MCS control section 102 according to Embodiment 1 of the present invention.
- an MCS (SIR) acquisition unit 201 acquires an MCS level corresponding to an SIR value notified from a communication partner from an MCS table 202.
- This MCS level is set as a provisional MCS level (MCS (SIR)), and the MCS (SIR) is output to the magnitude comparison unit 204.
- MCS provisional MCS level
- the MCS table 202 holds a table in which a modulation scheme and a coding ratio are combined.
- Fig. 3 shows a specific example of the table.
- MCS (p) storage section 203 stores the MCS level (MCS (p)) used at the time of the previous control, and outputs it to magnitude comparison section 204.
- the magnitude comparison unit 204 compares the MCS (SIR) output from the MCS (SIR) acquisition unit 201 with the MCS (SIR).
- MCS determining section 205 Based on the comparison result output from magnitude comparing section 204, MCS determining section 205
- an MCS level that falls within a predetermined fluctuation range is determined, a modulation scheme and a coding ratio corresponding to the determined MCS level are searched from the MCS table 202, and the rate matching section 103 and the modulation section are searched.
- the MCS determining section 205 outputs the determined MCS level to the MCS (p) storage section 203, and the MCS (p) storage section 203 stores the! /, MCS (P) newly determined. Update to MCS level.
- FIG. 4 is a flowchart showing an MCS determination procedure.
- MCS (SIR) acquisition section 201 acquires the SIR value obtained by the communication partner, and in ST402, the acquired SIR value
- the threshold power S is determined with respect to the thresholds SI, S2, S3 (S1 ⁇ S2> S3), and the MCS level (MCS (SIR)) is obtained.
- MCS MCS
- the magnitude comparison section 204 determines whether or not the MCS (SIR) obtained in ST402 exceeds the MCS level (MCS (p)) used in the previous MCS control. If this is the case, ST404 [Move to ST404, and then ST404 [KOO! /, Then, MCS determination] 205 The current MCS level used for CS control is raised by one from MCS (p), and the MCS determination procedure ends. . If the MCS (SIR) force does not exceed the MCS (p), proceed to ST405.
- MCS (SIR) force MCS (p) is equal to! /
- the process proceeds to ST 406 and proceeds to ST 406.
- the MCS determining unit 205 sets the MCS level used for the current MCS control to the same as the MCS (p), and performs the MCS determining procedure. finish.
- the MCS level to be used for the MCS control is lowered by one from MCS (p), and the MCS determination procedure ends.
- the MCS level (MCS (SIR)) tentatively determined based on the SIR value notified of the communication partner power and the MCS level (
- SIR fluctuation range
- P MCS level
- FIG. 5 shows a simulation result by the above-described MCS determination method.
- the horizontal axis indicates the MCS level
- the vertical axis indicates the number of times each MCS level is determined.
- the white graph shows the case where the MCS was determined using the ideal SIR value
- the shaded shade shows the case where the MCS was determined using only the MCS (SIR) (conventional method)
- the solid black The graph shows a case where the fluctuation range is restricted, that is, a case where the difference between the MCS level used this time and the MCS level used previously is restricted to within one.
- the number of times determined by the ideal SIR value is about 300
- the number of times determined by the conventional method is about 200
- the difference is 100 times.
- the number of times determined when the fluctuation range is restricted is about 250 times
- the number of erroneous determinations is reduced to 50 times.
- the MCS level By keeping the fluctuation range of the network within a predetermined number, it is possible to take into account the line quality but not reflect all the effects, and to moderate the fluctuation of the line quality.
- the MCS is determined, and the throughput can be improved. Also, the control delay can be reduced because the MCS level can be determined quickly. it can.
- the MCS level is set to four levels and the fluctuation range of the MCS level is limited to 1 or less has been described.
- the present invention is not limited to this, and may be set arbitrarily. It comes out.
- MCS SIR
- FIG. 6 is a block diagram showing a configuration of the transmitting apparatus according to Embodiment 2 of the present invention.
- parts in FIG. 6 common to FIG. 1 are denoted by the same reference numerals as in FIG. 1, and detailed description thereof will be omitted.
- the fd detection unit 601 detects the Doppler frequency (fd), and notifies the fluctuation width determination unit 602 of the detected fd.
- the fluctuation range determination unit 602 determines the fluctuation range of the MCS based on fd notified from the fd detection unit 601 and notifies the MCS control unit 603 of the determined fluctuation range. Specifically, when fd is small, the fluctuation width is reduced, and when fd is large, the fluctuation width is increased. This means that when the fd power S is small, the fading is slow, and the fluctuation of the line quality is gradual, and when the fd is large, the fading is fast, and the fluctuation of the line quality is steep. That's all.
- the MCS control unit 603 compares the magnitude of the MCS level (MCS (SIR)) tentatively obtained from the SIR value with the MCS level (MCS (p)) used in the previous control. Based on the comparison result, the MCS is determined by increasing or decreasing MCS (p) by the variation width notified from the variation width determination unit 602.
- MCS MCS level
- the variation width of MCS according to the Doppler frequency is determined.
- the power described using the SIR value as the channel quality is not limited to this.
- the present invention is not limited to this.
- a channel quality such as SNR (Signal to Noise Ratio) and CQI (Channel Quality of Indicator). Any index that indicates quality!
- a first aspect of the present invention provides a coding means for coding transmission data at a changeable coding rate, a modulation means for modulating with any one of a plurality of modulation schemes, Is determined in advance, the MCS level corresponding to the line quality is provisionally determined, and the provisionally determined MCS level is compared with the MCS level used in the previous control, and the level difference is within the fluctuation range.
- the MCS level is determined tentatively, and if the level difference exceeds the fluctuation range, the MCS level at which the level difference from the MCS level used in the previous control is limited to the fluctuation range is determined.
- a control means for controlling the encoding means and the modulation means so as to reach the determined MCS level.
- the provisionally determined MCS level is determined. If the level difference exceeds a predetermined fluctuation range, the MCS level in which the level difference with respect to the MCS level used in the previous control is limited to the predetermined fluctuation range is determined, so that the fluctuation of the MCS level is moderated. Therefore, since the estimation accuracy of the channel quality is low, even when the variance of the estimated channel quality is large, the MCS according to the actual channel quality is used, so that the throughput can be improved. In addition, since the MCS level can be determined quickly, control delay can be reduced.
- the detection means for detecting the Doppler frequency and the determination for determining a fluctuation range with respect to the MCS level used in the previous control in accordance with the detected Doppler frequency are a wireless communication apparatus that determines an MCS level with the determined variation width.
- the MCS level is determined with a fluctuation width corresponding to the Doppler frequency. Accordingly, even when the fluctuation of the line quality is large due to the effect of fading, the fluctuation of the line quality can be followed, so that the throughput can be improved.
- a third aspect of the present invention is the radio communication apparatus according to the above aspect, wherein the determining means increases the variation width when the Doppler frequency is high, and reduces the variation width when the Doppler frequency is low. It is.
- a predetermined fluctuation range is predetermined, an MCS level corresponding to the channel quality is provisionally obtained, and the provisionally obtained MCS level and the MCS level used in the previous control are used. And if the level difference is within the fluctuation range, the provisional MCS level is determined. If the level difference exceeds the fluctuation range, the MCS level used in the previous control is used.
- the provisionally determined MCS level is determined. If the level difference exceeds a predetermined fluctuation range, the MCS level in which the level difference with respect to the MCS level used in the previous control is limited to the predetermined fluctuation range is determined, so that the fluctuation of the MCS level is moderated. Therefore, since the estimation accuracy of the channel quality is low, even when the variance of the estimated channel quality is large, the MCS according to the actual channel quality is used, so that the throughput can be improved. In addition, since the MCS level can be determined quickly, control delay can be reduced.
- the wireless communication device and the MCS control method according to the present invention provide an MCS level at the time of previous control. By determining the MCS so that the difference between the MCS level and the MCS level at the time of this control falls within a predetermined range of fluctuation, it has the effect of improving the throughput even if the variance of the channel quality estimation value is large.
- the present invention can be applied to a wireless communication device that performs control.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Communication Control (AREA)
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/577,423 US20080274700A1 (en) | 2003-11-07 | 2004-10-25 | Radio Communication Apparatus and Mcs Determination Method |
EP04792921A EP1681820A1 (en) | 2003-11-07 | 2004-10-25 | Radio communication apparatus and mcs deciding method |
Applications Claiming Priority (2)
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JP2003378552A JP2005142923A (ja) | 2003-11-07 | 2003-11-07 | 無線通信装置及びmcs決定方法 |
JP2003-378552 | 2003-11-07 |
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WO2005046152A1 true WO2005046152A1 (ja) | 2005-05-19 |
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PCT/JP2004/015790 WO2005046152A1 (ja) | 2003-11-07 | 2004-10-25 | 無線通信装置及びmcs決定方法 |
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US (1) | US20080274700A1 (ja) |
EP (1) | EP1681820A1 (ja) |
JP (1) | JP2005142923A (ja) |
CN (1) | CN1875593A (ja) |
WO (1) | WO2005046152A1 (ja) |
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2003
- 2003-11-07 JP JP2003378552A patent/JP2005142923A/ja active Pending
-
2004
- 2004-10-25 WO PCT/JP2004/015790 patent/WO2005046152A1/ja active Application Filing
- 2004-10-25 EP EP04792921A patent/EP1681820A1/en not_active Withdrawn
- 2004-10-25 CN CNA2004800325188A patent/CN1875593A/zh active Pending
- 2004-10-25 US US10/577,423 patent/US20080274700A1/en not_active Abandoned
Patent Citations (3)
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JP2003259437A (ja) * | 2001-12-26 | 2003-09-12 | Matsushita Electric Ind Co Ltd | 無線通信装置および伝送レート決定方法 |
JP2003198426A (ja) * | 2001-12-27 | 2003-07-11 | Mitsubishi Electric Corp | 適応変調無線通信装置 |
JP2003298498A (ja) * | 2002-04-03 | 2003-10-17 | Nec Corp | 移動通信システム、移動局、基地局及びそれらに用いる通信路品質推定方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007147317A1 (fr) * | 2006-06-15 | 2007-12-27 | Huawei Technologies Co., Ltd. | MCS d'un procédé de détermination de données inverses et terminal d'accès |
WO2011150592A1 (zh) * | 2010-06-02 | 2011-12-08 | 中兴通讯股份有限公司 | Lte系统中的链路自适应方法、基站和终端 |
RU2486708C2 (ru) * | 2010-06-02 | 2013-06-27 | Зте Корпарейшен | Способ адаптации канала, базовая станция и терминал в lte системе |
US9020545B2 (en) | 2010-06-02 | 2015-04-28 | Zte Corporation | Link adaptation method, base station and terminal in LTE system |
CN102780877A (zh) * | 2012-07-06 | 2012-11-14 | 中国联合网络通信集团有限公司 | 视频数据发送方法及设备 |
Also Published As
Publication number | Publication date |
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EP1681820A1 (en) | 2006-07-19 |
US20080274700A1 (en) | 2008-11-06 |
CN1875593A (zh) | 2006-12-06 |
JP2005142923A (ja) | 2005-06-02 |
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