WO2005076512A1 - 無線装置及び無線通信システム並びに送信モード選択方法 - Google Patents
無線装置及び無線通信システム並びに送信モード選択方法 Download PDFInfo
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- WO2005076512A1 WO2005076512A1 PCT/JP2005/001860 JP2005001860W WO2005076512A1 WO 2005076512 A1 WO2005076512 A1 WO 2005076512A1 JP 2005001860 W JP2005001860 W JP 2005001860W WO 2005076512 A1 WO2005076512 A1 WO 2005076512A1
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- Prior art keywords
- wireless device
- reception quality
- propagation environment
- information
- transmission mode
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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
- 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
- H04L1/0002—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
-
- 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
-
- 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
Definitions
- the present invention relates to a wireless device, a wireless communication system, and a transmission mode selection method, and particularly relates to an improvement of a wireless communication system that switches a transmission mode according to reception quality and a propagation environment.
- a method for realizing high-speed and high-quality data transmission in a wireless communication system there is a method of switching a transmission mode according to reception quality.
- the transmission mode to be switched varies depending on the reception quality, but the parameters that vary the content include the modulation scheme and the coding rate of the error correction code.
- a coding rate kZn of an error correction code in which ( n — k) bits of redundant bits are added to k information bits is selected according to the reception quality, and the modulation is performed by one modulation.
- tl Selects a modulation method such as QPSK, 16 QAM, or 64 QAM that can transmit 2 bits, 4 bits, and 6 bits, respectively, according to the reception quality.
- the maximum data transmission rate also increases, but the reception quality (indicated by the block error rate, bit error rate, throughput, etc.) that satisfies the target communication quality (indicated by block error rate, bit error rate, throughput, etc.) For example, the SNR (signal power to noise power ratio) also increases.
- the reception quality fluctuates due to a propagation path between wireless devices, interference from other wireless devices, and the like.
- the data transmission rate is the highest among the modulation modes that can satisfy the target communication quality and the transmission mode based on the Z coding rate (hereinafter abbreviated as modulation and coding mode) in accordance with the reception quality. : ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ .
- Fig. 1 and Fig. 2 show the configuration of a conventional wireless device that performs the above modulation Z coding mode switching.
- the signal separating means 105 The control signal is separated from the signal received through the duplexer 103 and the receiver 104.
- Control signal demodulation means 106 demodulates the control signal and extracts reception quality information.
- the modulation / coding mode selection means 108 compares the reception quality with the switching threshold value of the modulation / Z-coding mode, and selects a modulation / coding mode according to the reception quality.
- the modulation and coding means 109 performs error correction coding and modulation on the data signal according to the selected modulation and coding mode.
- the signal multiplexing means 110 multiplexes the data signal output from the modulation Z coding means 109 together with a control signal carrying modulation / coding mode information and a pilot signal. Then, the output of the signal multiplexing means 110 is transmitted from the antenna 102 via the transmitter 111 and the duplexer 103 to the radio apparatus 121 of FIG.
- the signal separating means 125 separates the pilot signal from the signal received from the antenna 122 via the duplexer 123 and the receiver 124.
- the reception quality estimating means 129 estimates the SNR of the received signal from the pilot signal.
- Signal multiplexing means 130 multiplexes the control signal carrying the reception quality information on the data signal. Then, the output of the signal multiplexing means 130 is transmitted from the antenna 122 via the transmitter 131 and the duplexer 123 to the wireless device 101 in FIG.
- the switching threshold value of the modulation Z coding mode is determined to be a fixed value in advance so as to indicate a range of reception quality that satisfies the target communication quality as shown in FIG. 6A. In the example of Fig.
- the optimal modulation and coding mode is different if the propagation environment is different.
- the determinants of this propagation environment include the multipath environment (number of paths and delay dispersion) and the maximum Doppler frequency (moving speed).
- the difference in the optimal modulation Z coding mode means that the propagation environment has changed.
- the threshold of the reception quality for selecting the optimum modulation and coding mode changes. The greater the change in the propagation environment, the greater the change in the threshold for selecting the modulation Z-coding mode. Therefore, in the case of selecting the modulation and coding mode by comparing the reception quality with a fixed threshold, it is difficult to set the threshold to an optimum value.
- Japanese Patent Laid-Open No. 2003-37554 discloses a method of variably controlling a threshold based on the presence or absence of a reception error in information block units. is there.
- demodulation Z decoding means 127 demodulates the data signal in accordance with the modulation and coding mode superimposed on the control signal.
- Block error re-detection means 128 detects the presence or absence of a block error from the demodulation result of the data signal. This block error detection result is transmitted to the wireless device 101 on the control signal.
- the signal separating means 105 separates the control signal from the received signal.
- the control signal demodulation means 106 demodulates the control signal and extracts a block error detection result.
- the threshold control means 107 variably controls the threshold of the reception quality based on the presence or absence of the block error notified from the receiving side.
- FIGS. 6B and 6C show control methods when the currently used modulation / coding mode is MCS # 2.
- the thresholds T1 and T2 are lowered by a predetermined control amount ⁇ down dB, and the reception of the information block fails.
- the threshold T 1 and the threshold T 2 are increased by a predetermined control amount ⁇ up dB.
- the threshold T2 is reduced by a predetermined control amount Adown dB, and when the information block is unsuccessfully received, the threshold is reduced. Only T1 is increased by a predetermined control amount Aup dB.
- the threshold for selecting the code can be set adaptively.
- the threshold value of the reception quality for selecting the modulation / coding mode according to the change of the propagation environment can be optimized to some extent. It is considered that a deviation from the value occurs.
- Figure 7 shows the throughput characteristics with respect to the reception quality. The solid line shows the throughput characteristics in a good propagation environment, and the broken line shows the throughput characteristics in a poor propagation environment.
- the thresholds T 1 and T 2 for selecting the modulation and coding mode change to T 1 ′ and ⁇ 2 ′, and the throughput sizes ⁇ 1 and ⁇ 2 change to ⁇ 1 ′ and ⁇ 2.
- X block error rate
- a decrease in throughput means that the average of each modulation and coding mode This indicates that the typical block error rate increases. Therefore, in order to optimally control the switching threshold of the modulation and coding mode, it is necessary to change the target block error rate according to the propagation environment.
- An object of the present invention is to provide a radio apparatus, a radio communication system, and a transmission mode selection method capable of optimally selecting a transmission mode according to reception quality and a propagation environment. Disclosure of the invention
- the wireless device includes means for receiving reception quality information, transmission environment information, and block error rate detection information transmitted from a partner wireless device, and a target block error rate for each of a plurality of transmission modes registered.
- Target error rate selection means for selecting any of the plurality of tables according to the propagation environment information, and the transmission mode with a control amount based on the target block error rate according to the error rate detection information.
- Threshold value control means for controlling a threshold value of the reception quality for selecting the transmission quality information; and comparing the reception quality information with the threshold value.
- transmission mode selecting means is provided.
- a wireless communication system includes a first wireless device and a second wireless device.
- a wireless communication system wherein the first wireless device outputs a result of measuring reception quality with the second wireless device from a signal from the second wireless device as reception quality information.
- a propagation environment estimating unit that outputs, as propagation environment information, a result of estimating a propagation environment with the second wireless device from a signal from the second wireless device, Error detecting means for detecting a block error and outputting the result as an erroneous re-detection result; and transmitting means for transmitting the reception quality information, propagation environment information and erroneous re-detection result together with a data signal to the second wireless device.
- the second radio apparatus may select any one of a plurality of tables in which respective target block error rates of a plurality of transmission modes are registered according to the propagation environment information.
- Re-rate selection means for controlling a threshold of reception quality for selecting the transmission mode with a control amount based on the target block error rate according to the error re-detection result;
- a transmission mode selecting means is provided, which compares information with the threshold value, selects one of the transmission modes and sets the transmission mode to the first wireless device.
- the transmission mode selection method includes the steps of: receiving reception quality information, propagation environment information, and block error rate detection information transmitted from a partner wireless device; and registering a target block error rate of each of a plurality of transmission modes.
- a target error rate selection step for selecting any one of the plurality of tables according to the propagation environment information, and the control amount based on the target block error rate according to the error rate detection information.
- Another transmission mode selection method is a transmission mode selection method in a wireless communication system including a first wireless device and a second wireless device, wherein the first wireless device includes the second wireless device.
- a reception quality measurement step of outputting a result of measuring reception quality with the second wireless device from a signal from the device as reception quality information, and the second wireless device from the signal from the second wireless device.
- a propagation environment estimating step of outputting a result of estimating the propagation environment of the second radio apparatus as propagation environment information;
- the second wireless device wherein a target error rate selection for selecting any of a plurality of tables in which respective target block error rates of a plurality of transmission modes are registered in accordance with the propagation environment information. Selecting the transmission mode with a control amount based on the target block error rate according to the error detection result; and a threshold control step for controlling the reception quality threshold value.
- a transmission mode selecting step of selecting one of the transmission modes by comparing information with the threshold and setting the transmission mode to the first wireless device. And it features.
- a table of a target block error rate is selected according to a propagation environment, and a transmission mode is selected according to a control amount based on the target block error rate according to an error detection result. Control the threshold of reception quality. As a result, the optimum transmission mode can be selected according to the reception quality and the propagation environment.
- FIG. 1 is a diagram showing a configuration of a wireless device 101 in a conventional wireless communication system
- FIG. 2 is a diagram showing a configuration of a wireless device 121 in a conventional wireless communication system
- FIG. FIG. 4 is a diagram illustrating a configuration of a wireless device 1 according to an embodiment
- FIG. 4 is a diagram illustrating a configuration of a wireless device 21 according to an embodiment of the present invention
- FIG. FIG. 1 is a diagram showing a configuration of a wireless device 101 in a conventional wireless communication system
- FIG. 2 is a diagram showing a configuration of a wireless device 121 in a conventional wireless communication system
- FIG. FIG. 4 is a diagram illustrating a configuration of a wireless device 1 according to an embodiment
- FIG. 4 is a diagram illustrating a configuration of a wireless device 21 according to an embodiment of the present invention
- FIG. 6A to 6C are diagrams for explaining the operation of the threshold control means 8 in FIG. 3, and FIG. 7 is a diagram showing a throughput characteristic with respect to reception quality.
- FIG. 3 and 4 are block diagrams showing the configurations of the wireless device 1 and the wireless device 21 according to the embodiment of the present invention.
- the wireless device 1 shown in FIG. 3 includes an antenna 2, a duplexer 3, a receiver 4, a signal separator 5, a control signal demodulator 6, and a target error rate selector 7. , Threshold control means 8, modulation Z coding mode selection means (transmission mode selection means) 9, modulation and coding means 10, signal multiplexing means 11, and transmitter 12. ing.
- the receiver 4 sends the signal from the wireless device 21 received via the antenna 2 apology duplexer 3 to the signal separating means 5.
- the signal separating unit 5 separates the signal from the wireless device 21 into a data signal and a control signal, and sends the control signal to the control signal demodulating unit 6.
- the control signal demodulation unit 6 demodulates the control signal and extracts reception quality information, propagation environment information, and a block error detection result included in the control information.
- the target error rate selection means 7 receives the propagation environment information as input, and outputs a corresponding target block error rate for each modulation / coding mode.
- As the target block error rate an average block error rate is calculated for each modulation and coding mode by calculating throughput characteristics in various propagation environments in advance, and the value is used as the target block error rate.
- FIG. 5 shows the configuration of the target error rate selection means 7, which is composed of a target block error rate selection table group 41 and a table switching switch group.
- the target block error rate selection table group 41 stores the target block error rate for each modulation and coding mode according to the propagation environment information.
- FIG. 5 shows an example of a group of tables when the number of paths ⁇ and the maximum Doppler frequency f d are used as propagation environment information.
- An arbitrary number of this table group is prepared according to the number of paths P and the type of the maximum doppler frequency fd.
- propagation environment information in addition to the number of paths and the maximum Doppler frequency, multipath delay dispersion can be considered, and any combination of these information can be used as propagation environment information.
- the data signal is a code multiplexed (CDMA) signal
- the spreading factor (SF) and the number of codes affect the characteristics in addition to the propagation environment information. It is necessary to acquire the characteristics in advance by the spreading factor and the number of codes, and prepare a table group for the combination of SF and the number of codes.
- the threshold control means 8 variably controls the threshold of the range of the reception quality based on the presence or absence of the block error notified from the receiving side. As shown in FIGS. 6A and 6B, when the reception of the information block is successful, the threshold value control means 8 lowers the threshold by a predetermined control amount Adownd B, and the reception of the information block is stopped. If it fails, the threshold is increased by a predetermined control amount ⁇ up dB.
- the magnitude of Adown.Aup balances and the threshold converges. As a result, even if the propagation environment changes, the threshold for selecting the modulation / coding mode can be set optimally.
- the modulation and coding mode selection means 9 compares the reception quality information included in the control information with the reception quality threshold of each modulation and coding mode selection output by the threshold value control means 8, and determines which modulation and coding Decide whether to select the mode, and output it as modulation-no coding mode information.
- the modulation / encoding means 10 performs encoding on the input data signal based on the modulation / encoding mode information, and performs modulation. After that, it is sent to the signal combining means 11 as a data signal to which a CRC (Cyclic Redundancy Check) code is added as a block error detection code.
- CRC Cyclic Redundancy Check
- the signal multiplexing means 11 multiplexes the data signal, the pilot signal, and the control signal carrying the modulation and coding mode information, and transmits the signal to the antenna 2 via the transmitter 12 and the duplexer 3. Is transmitted to the wireless device 2.
- the wireless device 21 shown in FIG. 4 includes an antenna 22, a duplexer 23, a receiver 24, a signal separator 25, a control signal demodulator 26, and a demodulator / decoder. Means 27, block error detecting means 28, reception quality measuring means 29, propagation environment estimating means 30, signal multiplexing means 31, and transmitter 32 are provided.
- the receiver 24 sends the signal from the wireless device 1 received via the antenna 22 and the duplexer 23 to the signal separating means 25.
- the signal separating means 25 separates the data signal, the control signal, and the pilot signal from the output signal of the wireless device 1, sends the data signal to the demodulating and decoding means 27, and sends the control signal to the control signal demodulating means 26. And a pilot signal to the reception quality measuring means 29 and the propagation environment estimating means 30.
- the control signal demodulation means 26 demodulates the control signal and sends out, as control information, modulation / coding mode information for designating a modulation scheme and an error correction coding rate to the demodulation / decoding means 27.
- the demodulation Z decoding means 27 demodulates and decodes the data signal sent from the signal separation means 25 according to the modulation method and coding rate specified by the modulation Z coding mode information, and converts the decoded data into a block error. It is sent to the detection means 28.
- the block error detection means 28 uses the CRC code added to the data signal decoded by the demodulation / decoding means 27 to determine the presence or absence of a reception error in the information data block, and to determine the block error redetection result.
- the control signal is sent to the signal multiplexing means 31.
- the reception quality measuring means 29 measures the signal power-to-noise-power ratio (SNR) based on the input pilot signal, and uses the measured signal power-to-noise-power ratio (SNR) as reception quality information, which is transmitted to the signal multiplexing means 31 as a control signal.
- SNR signal power to interference power ratio
- SINR signal power to noise interference power ratio
- Propagation environment estimating means 30 estimates the propagation environment based on the input pilot signal, and transmits this to control signal as transmission environment information to signal multiplexing means 31.
- propagation environment information the number of multipath paths, delay dispersion, and maximum Doppler frequency (moving speed) can be considered.
- the signal multiplexing means 31 multiplexes the control signal carrying the data signal for transmission, the block error detection result, the reception quality information, and the propagation environment information.
- the signal is transmitted from the antenna 22 to the wireless device 1 through the antenna 22.
- optimal selection of the modulation Z encoding mode according to the propagation situation can be easily performed, and the throughput of a wireless communication system in which a plurality of transmission modes can be selected can be maximized.
- a plurality of tables correspond to the numbers of paths P1, P2, and PR (P1, P2, and PR are natural numbers and satisfy P1 ⁇ P2 ... PR). I do.
- a plurality of tables correspond to the maximum Doppler frequencies f O, f 1, f R-1 (f O ⁇ f 1 ⁇ f R-1).
- the maximum Doppler frequency fd is xj-1 ⁇ fd ⁇ xj (j is 1 Above, R—2 or less)
- fj as the maximum Doppler frequency
- f O as the maximum Doppler frequency when fd ⁇ ⁇
- f R- 1 as the maximum Doppler frequency when fd> xR-2 Shall be selected respectively.
- a plurality of tables correspond to delay dispersion ⁇ , ⁇ 1, ⁇ ⁇ , aR-1 ( ⁇ ⁇ 1 ... ... 1), and a threshold xi ( ⁇ i Is an arbitrary number that satisfies ⁇ ⁇ xi ⁇ + 1, 0 is an integer from 0 to R—2 or less, and the delay dispersion is xj-1 ⁇ j (j is 1 or more and R—2 or less)
- ⁇ ⁇ ⁇ 0, ⁇ is selected as the delay variance
- ⁇ ⁇ ⁇ 0 ⁇ is selected as the delay variance
- CT> X R-2 -1 is selected as the delay variance.
- a plurality of selection tables have the number of passes P1, P2,..., PJ (P1, P2,-, PJ is a natural number less than or equal to R and satisfies P1 ⁇ P2 ⁇ " ⁇ PJ), and the maximum Doppler frequency f0, f1 ,...
- a reception quality threshold for selecting a target block error rate table according to a communication propagation environment and selecting a transmission mode with a control amount based on the target block error rate according to an error detection result By controlling the value, there is an effect that the transmission mode can be optimally selected according to the reception quality and the propagation environment.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005517795A JPWO2005076512A1 (ja) | 2004-02-04 | 2005-02-02 | 無線装置及び無線通信システム並びに送信モード選択方法 |
US10/588,386 US7773687B2 (en) | 2004-02-04 | 2005-02-02 | Wireless apparatus, wireless communication system, and transmission mode selecting method |
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JP2004-027428 | 2004-02-04 | ||
JP2004027428 | 2004-02-04 |
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PCT/JP2005/001860 WO2005076512A1 (ja) | 2004-02-04 | 2005-02-02 | 無線装置及び無線通信システム並びに送信モード選択方法 |
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JP (1) | JPWO2005076512A1 (ja) |
WO (1) | WO2005076512A1 (ja) |
Cited By (3)
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WO2011021527A1 (ja) * | 2009-08-18 | 2011-02-24 | ソニー株式会社 | 送信装置、受信装置、無線装置および送信装置における伝送モード制御方法 |
JP2011166251A (ja) * | 2010-02-05 | 2011-08-25 | Nec Corp | マルチモード無線通信システムおよびマルチモード無線通信方法 |
JPWO2016104595A1 (ja) * | 2014-12-25 | 2017-04-27 | 三菱電機株式会社 | 送信装置、受信装置、通信装置および衛星通信システム |
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KR101531053B1 (ko) * | 2007-08-10 | 2015-06-25 | 한국전자통신연구원 | 다중 안테나 선택 기법을 이용한 적응 변조 장치 및 방법 |
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WO2009118905A1 (ja) * | 2008-03-28 | 2009-10-01 | 富士通株式会社 | 携帯端末装置および携帯端末装置の省電力制御方法 |
US8340586B2 (en) | 2008-11-19 | 2012-12-25 | T-Mobile Usa, Inc. | System and method for link adaptation for variable link conditions |
KR101100551B1 (ko) * | 2008-12-17 | 2011-12-29 | 삼성메디슨 주식회사 | 클러터 신호를 필터링하는 초음파 시스템 및 방법 |
CN101605358B (zh) * | 2009-06-29 | 2011-11-30 | 中兴通讯股份有限公司 | 上行速率控制方法和系统 |
FR2953347A1 (fr) * | 2009-11-30 | 2011-06-03 | Astrium Sas | Procede de selection de format de transmission et module de calibration de seuils pour systeme de telecommunications par satellite |
JP2015513834A (ja) * | 2012-02-20 | 2015-05-14 | ノキア ソリューションズ アンド ネットワークス オサケユキチュア | ベースステーションとユーザ装置との間の送信に対する変調及びコード化スキームのコントロール |
US10772024B2 (en) | 2018-01-12 | 2020-09-08 | At&T Intellectual Property I, L.P. | Adaptive multiple antenna transmission scheme for uplink data transmission in wireless communication systems |
EP3895466A1 (en) * | 2018-12-13 | 2021-10-20 | Telefonaktiebolaget LM Ericsson (publ) | Autonomous parameter setting |
US20240063938A1 (en) * | 2021-04-08 | 2024-02-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Network node and method for link adaption in a wireless communication network |
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- 2005-02-02 US US10/588,386 patent/US7773687B2/en not_active Expired - Fee Related
- 2005-02-02 JP JP2005517795A patent/JPWO2005076512A1/ja active Pending
- 2005-02-02 WO PCT/JP2005/001860 patent/WO2005076512A1/ja active Application Filing
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WO2011021527A1 (ja) * | 2009-08-18 | 2011-02-24 | ソニー株式会社 | 送信装置、受信装置、無線装置および送信装置における伝送モード制御方法 |
US8649449B2 (en) | 2009-08-18 | 2014-02-11 | Sony Corporation | Sending apparatus, reception apparatus, wireless apparatus and transmission mode control method for sending apparatus |
JP2011166251A (ja) * | 2010-02-05 | 2011-08-25 | Nec Corp | マルチモード無線通信システムおよびマルチモード無線通信方法 |
JPWO2016104595A1 (ja) * | 2014-12-25 | 2017-04-27 | 三菱電機株式会社 | 送信装置、受信装置、通信装置および衛星通信システム |
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US7773687B2 (en) | 2010-08-10 |
US20070160122A1 (en) | 2007-07-12 |
JPWO2005076512A1 (ja) | 2007-10-18 |
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