WO2011055238A1 - Asymmetrical feedback for coordinated transmission systems - Google Patents

Asymmetrical feedback for coordinated transmission systems Download PDF

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Publication number
WO2011055238A1
WO2011055238A1 PCT/IB2010/053272 IB2010053272W WO2011055238A1 WO 2011055238 A1 WO2011055238 A1 WO 2011055238A1 IB 2010053272 W IB2010053272 W IB 2010053272W WO 2011055238 A1 WO2011055238 A1 WO 2011055238A1
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Prior art keywords
feedback data
data
feedback
channel
different
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English (en)
French (fr)
Inventor
Krishna Srikanth Gomadam
Adoram Erell
Daniel Yellin
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Marvell World Trade Ltd
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Marvell World Trade Ltd
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Priority to EP10827994.4A priority Critical patent/EP2499862B1/en
Priority to CN201080042487.XA priority patent/CN102550079B/zh
Priority to JP2012537460A priority patent/JP5669854B2/ja
Publication of WO2011055238A1 publication Critical patent/WO2011055238A1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter

Definitions

  • the present invention relates generally to communication systems, and particularly to methods and systems for providing feedback regarding communication channels.
  • MIMO communication systems use cooperative transmission schemes, in which multiple base stations coordinate beamforming and precoding decisions with one another. Coordinated transmission is also referred to as coordinated beamforming or Coordinated Multipoint (CoMP). Coordinated transmission is considered, for example, for Evolved Universal Terrestrial Radio Access (E-UTRA) systems, also referred to as Long-Term Evolution (LTE), which are specified by the Third Generation Partnership Project (3GPP).
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • LTE Long-Term Evolution
  • 3GPP Third Generation Partnership Project
  • Cooperative beamforming for LTE is described, for example, in document Rl-093488 of the 3 GPP Technical Specification Group (TSG) Radio Access Network (RAN), entitled “LTE Spectral Efficiency and IMT-Advanced Requirements,” Shenzhen, China, August 24-28, 2009, which is incorporated herein by reference.
  • TSG Technical Specification Group
  • RAN Radio Access Network
  • Coordinated transmission schemes often use feedback regarding the communication channels, which is fed back from the mobile terminals to the base stations.
  • An example feedback scheme for coordinated transmission is described in 3GPP TSG RAN document Rl -092634, entitled “CoMP Operation Based on Spatial Covariance Feedback and Performance Results of Coordinated SU/MU Beamforming," Los Angeles, California, June 29 - July 3, 2009, which is incorporated herein by reference.
  • 3 GPP TSG RAN document Rl -093474 entitled “Coordinated Beamforming with DL MU-MIMO,” Shenzhen, China, August 24-28, 2009, which is incorporated herein by reference, describes a Multi-User MIMO (MU-MIMO) scheme with coordinated beamforming, which is based on a long-term wideband transmit covariance matrix.
  • MU-MIMO Multi-User MIMO
  • LTE-A LTE-Advanced
  • Example CoMP schemes for LTE-A are described in 3GPP TSG RAN document Rl-093833, entitled “System Performance Comparisons of Several DL CoMP schemes,” Miyazaki, Japan, October 12-16, 2009, which is incorporated herein by reference.
  • 3 GPP TSG RAN document Rl -093132 entitled “DL performance of LTE-A: FDD,” Shenzhen, China, August 24-28, 2009, which is incorporated herein by reference, describes LTE-A MU-MIMO schemes with CoMP using Frequency Division Duplexing (FDD).
  • FDD Frequency Division Duplexing
  • 3GPP TSG RAN document Rl-093109 entitled “Feedback in Support of DL CoMP: General Views,” Shenzhen, China, August 24-28, 2009, which is incorporated herein by reference, discusses several feedback design options for implementing CoMP in LTE-A systems.
  • An embodiment that is described herein provides a method used in a mobile communication terminal.
  • the method includes receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals.
  • First and second feedback data which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size.
  • the first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations.
  • formulating the first and second feedback data includes including in the first feedback data at least one feedback parameter that is not included in the second feedback data.
  • formulating the first and second feedback data includes representing the first feedback data at a first quantization, and representing the second feedback data at a second quantization, different from the first quantization.
  • formulating the first and second feedback data includes calculating the first feedback data at a first spectral resolution, and calculating the second feedback data at a second spectral resolution, different from the first spectral resolution.
  • transmitting the first and second feedback data includes transmitting the first feedback data at a first update rate, and transmitting the second feedback data at a second update rate, different from the first update rate.
  • formulating the first and second feedback data includes causing the second data size to be smaller than the first data size.
  • formulating the first and second feedback data includes, upon identifying that first interference caused by the first base station is stronger than second interference caused by the second base station, computing the first feedback data at a first data size and computing the second feedback data at a second data size, smaller than the first data size.
  • formulating the first and second feedback data includes computing for the first and second communication channels respective first and second channel matrices having respective different first and second ranks.
  • formulating the first and second feedback data includes defining the first feedback data as the respective channel measure of the first communication channel, and defining the second feedback data as an implicit function of the respective channel measure of the second communication channel.
  • the method includes receiving in an additional mobile communication terminal a signal from the first base station over a third communication channel, formulating third feedback data for the third communication channel such that the third feedback data has a third data size that is different from the first data size, and transmitting the third feedback data from the additional mobile communication terminal to at least the one of the base stations.
  • apparatus including a receiver, a transmitter and processing circuitry.
  • the receiver is configured to receive from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels.
  • the processing circuitry is configured to calculate respective channel measures for the communication channels based on the received signals, and to formulate first and second feedback data that are indicative of the respective channel measures of the first and second communication channels, such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size.
  • the transmitter is configured to transmit the first and second feedback data to at least one of the base stations.
  • a mobile communication terminal includes the apparatus described herein.
  • a chipset for processing signals in a mobile communication terminal includes the apparatus described herein.
  • a system that includes at least first and second base stations and a mobile communication terminal.
  • the base stations cooperate in a coordinated transmission scheme and are configured to transmit signals to mobile communication terminals.
  • the mobile communication terminal is configured to receive the signals from the first and second base stations over respective first and second communication channels, to calculate respective channel measures for the communication channels based on the received signals, to formulate first and second feedback data that are indicative of the respective channel measures of the first and second communication channels, and to transmit the first feedback data at a first data size and the second feedback data at a second data size, different from the first data size, to at least one of the base stations.
  • FIG. 1 is a block diagram that schematically illustrates a communication system using coordinated transmission and asymmetrical feedback, in accordance with an embodiment that is described herein;
  • Fig. 2 is a flow chart that schematically illustrates a method for communication using coordinated transmission and asymmetrical feedback, in accordance with an embodiment that is described herein.
  • base stations collect feedback from mobile communication terminals regarding communication channel characteristics, and configure downlink transmissions based on the feedback.
  • the volume of feedback that is transmitted from various terminals in the network consumes considerable uplink bandwidth, and may therefore degrade system capacity and performance.
  • Embodiments that are described hereinbelow provide improved methods and systems for delivering feedback from mobile communication terminals to base stations that use cooperative transmission.
  • a given terminal receives downlink signals from multiple base stations over multiple communication channels, and generates feedback data for the multiple channels.
  • the terminal transmits the feedback data to at least one of the base stations, typically to a base station that is defined as the serving base station of the terminal.
  • the base stations configure their downlink transmissions based on the feedback data.
  • the terminal formulates the feedback data for one communication channel with a certain data size, and with a different data size for another communication channel.
  • the terminal formulates the feedback data for at least two of the channels to differ in data size.
  • the feedback data for different channels may differ, for example, in the number or identity of feedback parameters, quantization level, spectral resolution and/or update rate.
  • the terminal selects which channels will receive larger-size feedback data and which channels will receive smaller-size feedback data, according to a certain selection criterion.
  • selection criteria are described herein.
  • channels whose impact on the terminal e.g., interference
  • non-uniform data size is applied across different terminals. In other words, two terminals may transmit feedback data having different data sizes.
  • the disclosed techniques enable the terminal to match the data size (and thus the accuracy) of the feedback data per communication channel, rather than having to compromise for a fixed data size for all channels. As a result, highly-accurate feedback can be obtained where needed, while transmitting smaller-size feedback data for the other channels. Thus, the average uplink bandwidth used for feedback transmission is reduced considerably, with little or no degradation in feedback performance.
  • Fig. 1 is a block diagram that schematically illustrates a communication system 20, which uses coordinated transmission and asymmetrical feedback, in accordance with an embodiment that is described herein.
  • System 20 comprises a mobile communication terminal 24 (also referred to as User Equipment - UE), and two Base Transceiver Stations (BTSs) 28A and 28B.
  • UE 24 may comprise, for example, a cellular phone, a communication- enabled mobile computing device, a cellular adapter for a mobile computing device, or any other suitable communication terminal.
  • Fig. 1 shows a single UE and two BTSs for the sake of clarity, real-life systems typically comprise multiple UEs and multiple BTSs.
  • system 20 operates in accordance with the 3GPP Long-Term Evolution Advanced (LTE-A) specifications.
  • LTE-A Long-Term Evolution Advanced
  • system 20 may operate in accordance with any other suitable communication standard or protocol.
  • the disclosed techniques can also be applied in Wi-Fi systems operating in accordance with the IEEE 802.11 specifications or in WiMAX systems operating in accordance with the IEEE 802.16m specifications.
  • the BTSs in system 20 use a coordinated transmission scheme, in which they coordinate their downlink transmissions, and in particular coordinate their scheduling and beamforming decisions.
  • UE 24 receives downlink signals from multiple BTSs.
  • a subset of these BTSs (which may comprise all the BTSs that are received by the UE or a partial subset of the received BTSs) is defined as the reporting set of the UE, i.e., as the set of BTSs for which the UE provides channel feedback.
  • the downlink signals are received by one or more UE antennas 32.
  • system 20 comprises a MIMO system, meaning that the BTSs and the UE each comprises multiple antennas.
  • Each downlink signal is received over a respective communication channel between a certain BTS and the UE.
  • UE 24 comprises a downlink receiver 36, which receives the downlink signals from the BTSs. Receiver 36 typically down- converts, filters and digitizes the downlink signals.
  • the UE further comprises a channel measure calculation unit 40, which calculates a respective channel measure for each communication channel by processing the received downlink signals. Unit 40 may calculate various types of channel measures that are indicative of the characteristics of the respective channels.
  • channel measures are explicit, i.e., refer to channel characteristics irrespective of any specific transmission or reception scheme.
  • Other channel measures are implicit, i.e., based on certain assumptions regarding the transmission or reception scheme.
  • explicit channel measures comprise channel matrices (e.g., matrices representing the transfer amplitude and phase for different pairs of BTS antenna and UE antenna) and channel covariance matrices (e.g., matrices representing auto- and cross-correlations between the signals received via different pairs of BTS antenna and UE antenna).
  • implicit channel measures comprise Preferred Matrix Indices (PMI) and Channel Quality Indications (CQI), as defined in the E-UTRA specifications.
  • Unit 40 may calculate any of these types of channel measures, or any other suitable type of channel measure.
  • each channel measure typically comprises multiple parameters.
  • UE 24 comprises a feedback formulation unit 44, which formulates the channel measures produced by unit 40 into respective feedback data.
  • unit 44 produces feedback data having non-uniform data size.
  • the feedback data for one channel may differ in data size from the feedback data for another channel.
  • Example techniques for formulating the feedback data at a non-uniform data size are described below.
  • feedback data that differ in data size refers only to nonzero data size, i.e., to those channels (or BTSs) for which the UE provides non-empty feedback.
  • a BTS for which the UE does not provide feedback e.g., a BTS that is not in the reporting set of the UE
  • a BTS for which the UE does not provide feedback is not considered herein as differing in feedback data size from a BTS for which the UE does provide feedback.
  • UE 24 generates the feedback data in two stages - channel measure calculation followed by feedback data formulation.
  • the channel measures are not necessarily of non-uniform data size. Assignment of different data sizes to different feedback data (i.e., for different channels) is carried out by unit 44.
  • the functions of units 40 and 44 are combined in a single unit.
  • the channel measures are calculated a-priori at a data size that potentially differs from one channel to another.
  • Unit 44 provides the feedback data for the different channels to an uplink transmitter 48.
  • the uplink transmitter converts the feedback data to an analog signal, up- converts the signal to a suitable Radio Frequency (RF) and transmits the RF signal (and thus the feedback data) to at least one of the BTSs.
  • RF Radio Frequency
  • one of the BTSs is defined as the serving BTS of the UE, and transmitter 48 transmits the feedback data to the serving BTS.
  • the serving BTS distributes the feedback to the other BTSs, and the BTSs use this information for configuring their downlink transmissions.
  • UE 24 receives downlink signals from two BTSs 28 A and 28B over two communication channels denoted CHI and CH2, respectively.
  • the UE calculates channel measures and formulates feedback data for these two channels.
  • the feedback data for CHI has a different data size relative to the feedback data for CH2.
  • BTS 28A is defined as the serving BTS of UE 24, and therefore the UE transmits the feedback data for both channels to this BTS.
  • BTS 28 A distributes the feedback data to BTS 28B, so that the two BTSs can configure and coordinate their downlink transmissions based on the feedback data.
  • UE 24 may receive downlink signals from any suitable number of BTSs, and produce feedback data for any desired number of channels.
  • two or more sets of equipment e.g., transceivers and antennas
  • the equipment serving each cell is regarded as a separate BTS.
  • Multiple BTSs serving multiple cells may be collocated in the same location.
  • UE configuration shown in Fig. 1 is a simplified example configuration, which is depicted solely for the sake of conceptual clarity. In alternative embodiments, any other suitable UE configuration can be used. UE elements that are not necessary for understanding the disclosed techniques have been omitted from the figure for the sake of clarity.
  • the different elements of UE 24, including receiver 36, units 40 and 44 and transmitter 48, may be implemented using dedicated hardware, such as using one or more Application-Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs) or other suitable hardware devices.
  • ASICs Application-Specific Integrated Circuits
  • FPGAs Field-Programmable Gate Arrays
  • some UE elements may be implemented using software configured to run on a processor device, or using a combination of hardware and software elements.
  • the processor is programmed in software to carry out the functions described herein, although it too may be implemented on dedicated hardware.
  • the software may be downloaded to the processor in electronic form, over a network, for example, or it may, alternatively or additionally, be provided and/or stored on non-transitory tangible media, such as magnetic, optical or electronic memory.
  • some or all of the elements of UE 24 may be fabricated in a chip-set.
  • Feedback formulation unit 44 may formulate the feedback data for different channels at different data sizes in various ways. Moreover, unit 44 may use various criteria to select the appropriate data size for each channel. Generally, the accuracy of the feedback data increases with data size. Thus, modifying the feedback data size can trade feedback accuracy for uplink throughput, and vice versa.
  • unit 44 formulates the feedback data for the channel received from the serving BTS at a larger data size, in comparison with the channels received from other BTSs.
  • unit 44 formulates the feedback data for CHI to have a larger data size than the feedback data for CH2. Since the impact of the serving BTS on the UE performance is stronger than the impact of other BTSs, providing higher-accuracy feedback for the serving BTS and lower-accuracy feedback for the other BTSs increases the feedback efficiency.
  • feedback formulation unit 44 selects the appropriate feedback data size based on the level of interference caused by the different BTSs. For example, unit 44 may produce large-size (high-accuracy) feedback data for BTSs that cause strong interference to the UE, and vice versa. Additionally or alternatively, in an embodiment, unit 44 selects the feedback data size for the different downlink channels in accordance with any other suitable criterion.
  • unit 44 generates feedback data at a non-uniform data size using various techniques.
  • the description that follows refers to the feedback data for channels CHI and CHI of Fig. 1, and presents example techniques for formulating the feedback data to differ in data size.
  • the feedback data for CHI is referred to as FBI
  • the feedback data for CH2 is referred to as FB2, respectively.
  • both FBI and FB2 are transmitted to BTS 28A, the serving BTS of UE 24. Since BTS 28A is the serving BTS, FBI is formulated to have a larger data size than FB2.
  • the techniques described below can be used in any other suitable system configuration.
  • FBI and FB2 each comprise one or more feedback parameters.
  • UE 24 formulates FBI to differ from FB2 in the number and/or identity of the parameters.
  • each feedback data comprises a covariance matrix for the respective channel.
  • FBI comprises a certain number of eigenvectors (of the covariance matrix for CHI) and FB2 comprises a smaller number of eigenvectors (of the covariance matrix for CH2).
  • the number of reported eigenvectors is sometimes referred to as the rank of the feedback data.
  • the number of eigenvectors in FBI is up to the maximum rank of transmission for the UE, and the number of eigenvectors in FB2 is 1 or alternatively 2.
  • FBI comprises two eigenvectors and FB2 comprises a single eigenvector.
  • UE 24 may configure FBI and FB2 to differ in the number and/or identity of any other suitable feedback parameters.
  • UE 24 formulates FBI to have a finer quantization level than FB2.
  • UE 24 selects the feedback data (e.g., channel matrix or covariance matrix) from a predefined set of possible values, referred to as a codebook.
  • UE 24 selects FBI from a larger codebook than the codebook from which FB2 is selected.
  • JP coherent Joint Processing
  • the UE selects the feedback data for the strongest BTS from a codebook whose size is denoted B, the feedback data for the next-strongest BTS from a codebook whose size is denoted B/2, and so on.
  • B 2 m , wherein possible values of m are 4, 5 and 6.
  • any other suitable codebook sizes can be used.
  • Explicit channel measures refer to channel characteristics irrespective of any specific transmission or reception scheme. Implicit channel measures, on the other hand, are based on certain assumptions regarding the transmission or reception scheme. Explicit channel measures comprise, for example, channel matrices or covariance matrices. Implicit channel measures comprise, for example, PMI or CQI.
  • UE 24 formulates FBI (for the serving BTS) based on one or more explicit channel measures, and FB2 based on one or more implicit channel measures. In alternative embodiments, UE 24 formulates FBI based on one or more implicit channel measures, and FB2 based on one or more explicit channel measures.
  • UE 24 formulates FBI to have a finer quantization level than FB2 by representing FBI at a finer numerical precision than FB2.
  • the feedback parameters in FBI can be represented using a larger number of bits than FB2.
  • the UE may use any other suitable scheme for formulating the feedback data for different channels to differ in quantization level.
  • UE 24 formulates FBI to have a finer spectral resolution than FB2.
  • UE 24 estimates the feedback data for each channel (e.g., channel matrix or covariance matrix) in a certain number of frequency sub- bands.
  • the UE transmits FBI for a larger number of sub-bands than FB2.
  • each feedback parameter in FBI corresponds to a narrower sub-band than the respective parameter in FB2. Therefore, FBI is typically more accurate than FB2, at the expense of larger data size.
  • the feedback data for the serving BTS is transmitted at a finer spectral resolution than the feedback data for other BTSs.
  • a total bandwidth of 10MHz that comprises fifty resource blocks.
  • FBI comprises ten values for ten respective sub-bands, each sub-band comprising five resource blocks, and FB2 comprises a single value for the entire bandwidth (fifty resource blocks).
  • UE 24 can formulate the feedback data to differ in spectral resolution using any other suitable criterion.
  • UE 24 updates FBI at a faster update rate than FB2.
  • Each update may be of the same data size or of non-uniform data size. Nevertheless, because FBI is updated more frequently, the data size of FBI over a certain time period is larger than the data size of FB2.
  • FBI is updated every 5-50mS
  • FB2 is updated every 50mS-lS.
  • any other suitable update rates can be used.
  • UE 24 may use a higher update rate for the feedback data regarding stronger BTSs, and lower update rates for the feedback data regarding weaker BTSs, or vice versa.
  • UE 24 sets a different update rate for different feedback parameters in the feedback data of a given channel. For example, when the feedback data comprises a channel matrix, the UE may update the magnitudes of the matrix elements (which sometimes vary rapidly) at a relatively fast update rate, and the phases of the matrix elements (which often vary slowly) at a slower rate. This differential selection of update rate may also vary from one channel to another.
  • FBI may differ from FB2 in a combination of two or more of the above properties (e.g., number or identity of parameters, quantization level, spectral resolution and/or in update rate), or in any other suitable property.
  • Fig. 2 is a flow chart that schematically illustrates a method for communication using coordinated transmission and asymmetrical feedback, in accordance with an embodiment that is described herein.
  • the method begins at a reception operation 60, with UE 24 receiving coordinated-transmission downlink signals from two or more BTSs over respective communication channels.
  • unit 40 in UE 24 calculates channel measures (e.g., channel or covariance matrices) for the respective communication channels.
  • unit 44 in UE 24 formulates the feedback data for each channel based on the respective channel measure. In particular, unit 44 formulates the feedback data for at least two of the channels to differ in data size, as explained above.
  • transmitter 48 in UE 24 transmits the feedback data for the multiple channels to at least one of the BTSs, typically to the serving BTS.
  • the BTSs coordinate their downlink transmissions to UE 24 (and/or to other UEs) based on the feedback data.
  • the UE formulates different-size feedback data for different communication channels (i.e., for different BTSs). Additionally or alternatively, non-uniformity in feedback data size can be applied across different UEs. In other words, two (or more) different UEs can formulate the feedback data for a given BTS to differ in data size. Any of the techniques described above (e.g., feedback data that differs in the number or identity of parameters, in quantization level, in spectral resolution and/or in update rate) can be used.
  • the embodiments described herein mainly address generation of channel feedback data from mobile communication terminals to base stations at a non-uniform data size
  • the methods and systems described herein can also be used in other applications in which multiple transmitters coordinate their transmission with one another, such as in Wi-Fi and WiMAX systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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EP10827994.4A EP2499862B1 (en) 2009-11-09 2010-07-19 Asymmetrical feedback for coordinated transmission systems
CN201080042487.XA CN102550079B (zh) 2009-11-09 2010-07-19 用于经协调的发射系统的非对称反馈
JP2012537460A JP5669854B2 (ja) 2009-11-09 2010-07-19 調整送信を利用する基地局にフィードバックデータを送信するための方法及び装置、並びに調整送信スキームを利用する基地局及びフィードバックデータを送信する移動通信端末を備えたシステム

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2637438A1 (en) * 2012-03-09 2013-09-11 Alcatel Lucent Apparatus and Method for Communicating with a First Transmission Point and with a Second Transmission Point and Apparatus and Method for Coordinating a Downstream Transmission from a First and a Second Transmission Point
CN103378891A (zh) * 2012-04-25 2013-10-30 中兴通讯股份有限公司 基于全局预编码的业务传输方法及系统、用户设备及基站
CN104283655A (zh) * 2013-07-10 2015-01-14 财团法人工业技术研究院 传送及接收混合自动重传请求回传的方法
EP2824862A3 (en) * 2013-07-10 2015-02-25 Industrial Technology Research Institute Method of handling HARQ feedbacks
RU2560965C1 (ru) * 2014-03-05 2015-08-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный университет систем управления и радиоэлектроники" Способ изготовления проходного вакуумного изолятора высокого напряжения
EP2795827A4 (en) * 2011-12-20 2016-01-13 Marvell World Trade Ltd REFERENCE SIGNAL DESIGN FOR COORDINATED MULTIPORT TRANSMISSION
US9479293B2 (en) 2013-07-10 2016-10-25 Industrial Technology Research Institute Method of handling HARQ feedbacks and related communication device

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008156700A2 (en) * 2007-06-15 2008-12-24 Worcester Polytechnic Institute Precision location methods and systems
CN102090144B (zh) * 2008-07-08 2014-07-09 皇家飞利浦电子股份有限公司 用于确定led发光单元的相对位置的方法和装置
WO2010076778A1 (en) 2009-01-05 2010-07-08 Marvell World Trade Ltd Precoding codebooks for mimo communication systems
US8385441B2 (en) 2009-01-06 2013-02-26 Marvell World Trade Ltd. Efficient MIMO transmission schemes
US8238483B2 (en) 2009-02-27 2012-08-07 Marvell World Trade Ltd. Signaling of dedicated reference signal (DRS) precoding granularity
JP5669854B2 (ja) * 2009-11-09 2015-02-18 マーベル ワールド トレード リミテッド 調整送信を利用する基地局にフィードバックデータを送信するための方法及び装置、並びに調整送信スキームを利用する基地局及びフィードバックデータを送信する移動通信端末を備えたシステム
JP5258002B2 (ja) 2010-02-10 2013-08-07 マーベル ワールド トレード リミテッド Ｍｉｍｏ通信システムにおける装置、移動通信端末、チップセット、およびその方法
US8948800B2 (en) * 2010-03-30 2015-02-03 Qualcomm Incorporated Systems, apparatuses, and methods to facilitate coordinated scheduling in wireless communication systems
US8615052B2 (en) 2010-10-06 2013-12-24 Marvell World Trade Ltd. Enhanced channel feedback for multi-user MIMO
JP2012100254A (ja) 2010-10-06 2012-05-24 Marvell World Trade Ltd Ｐｕｃｃｈフィードバックのためのコードブックサブサンプリング
US9048970B1 (en) 2011-01-14 2015-06-02 Marvell International Ltd. Feedback for cooperative multipoint transmission systems
US8861391B1 (en) * 2011-03-02 2014-10-14 Marvell International Ltd. Channel feedback for TDM scheduling in heterogeneous networks having multiple cell classes
JP6019502B2 (ja) 2011-03-31 2016-11-02 マーベル ワールド トレード リミテッド 協調マルチポイント送信のためのチャネルフィードバック
US9923683B2 (en) * 2011-04-07 2018-03-20 Interdigital Patent Holdings, Inc. Method and apparatus for local data caching
US9008018B2 (en) * 2011-11-04 2015-04-14 Intel Corporation Dynamic point selection via a coordinating set of base stations
WO2013068916A1 (en) 2011-11-07 2013-05-16 Marvell World Trade Ltd. Codebook sub-sampling for frequency-selective precoding feedback
WO2013068915A2 (en) 2011-11-07 2013-05-16 Marvell World Trade Ltd. Precoding feedback for cross-polarized antennas with magnitude information
WO2013068974A1 (en) 2011-11-10 2013-05-16 Marvell World Trade Ltd. Differential cqi encoding for cooperative multipoint feedback
US9220087B1 (en) 2011-12-08 2015-12-22 Marvell International Ltd. Dynamic point selection with combined PUCCH/PUSCH feedback
US8902842B1 (en) 2012-01-11 2014-12-02 Marvell International Ltd Control signaling and resource mapping for coordinated transmission
KR101974900B1 (ko) * 2012-01-19 2019-05-07 삼성전자주식회사 통신 시스템에서 하이브리드 자동 재전송 요청 방법 및 장치
US8953478B2 (en) * 2012-01-27 2015-02-10 Intel Corporation Evolved node B and method for coherent coordinated multipoint transmission with per CSI-RS feedback
EP2842361B1 (en) 2012-04-27 2019-03-27 Marvell World Trade Ltd. Coordinated multipoint (comp) communication between base-stations and mobile communication terminals
US9198072B2 (en) 2012-05-17 2015-11-24 Marvell World Trade Ltd. Calculating and reporting channel characteristics
US9225478B2 (en) * 2012-07-02 2015-12-29 Intel Corporation Supporting measurments and feedback for 3D MIMO with data transmission optimization
US9521670B2 (en) 2013-03-05 2016-12-13 Marvell World Trade Ltd. Signal decoding in the presence of almost-blank subframes (ABS)
US10261568B2 (en) 2015-09-16 2019-04-16 Microsoft Technology Licensing, Llc Enhancing user experience relative to peripheral devices
CN109156022B (zh) 2016-06-22 2022-08-09 英特尔公司 用于全双工调度的通信设备和方法
US10879928B2 (en) 2016-10-24 2020-12-29 Marvell Asia Pte, Ltd. Scaling of log-likelihood ratios (LLR) based on long training field (LTF)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070153731A1 (en) 2006-01-05 2007-07-05 Nadav Fine Varying size coefficients in a wireless local area network return channel
US20080192852A1 (en) * 2007-02-12 2008-08-14 Mark Kent Method and system for an alternating channel delta quantizer for 2x2 mimo pre-coders with finite rate channel state information feedback
US20090161605A1 (en) 2004-12-07 2009-06-25 Adaptix, Inc. Cooperative mimo in multicell wireless networks
EP2665200A1 (en) 2010-01-29 2013-11-20 Qualcomm Incorporated Reporting of channel information to support coordinated multi-point data transmission

Family Cites Families (204)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231629A (en) 1990-10-01 1993-07-27 Motorola, Inc. Full-duplex communication system
US5263160A (en) 1991-01-31 1993-11-16 Digital Equipment Corporation Augmented doubly-linked list search and management method for a system having data stored in a list of data elements in memory
US5349567A (en) 1993-08-24 1994-09-20 Hughes Aircraft Company Least mean square (LMS) normalizer for active sonar
AU4238697A (en) 1996-08-29 1998-03-19 Cisco Technology, Inc. Spatio-temporal processing for communication
US5940439A (en) 1997-02-26 1999-08-17 Motorola Inc. Method and apparatus for adaptive rate communication system
US6354733B2 (en) 1999-01-15 2002-03-12 Ametex, Inc. System and method for determining combustion temperature using infrared emissions
US6512750B1 (en) 1999-04-16 2003-01-28 Telefonaktiebolaget Lm Ericsson (Publ) Power setting in CDMA systems employing discontinuous transmission
US6757319B1 (en) 1999-11-29 2004-06-29 Golden Bridge Technology Inc. Closed loop power control for common downlink transport channels
US6865237B1 (en) 2000-02-22 2005-03-08 Nokia Mobile Phones Limited Method and system for digital signal transmission
US6466904B1 (en) 2000-07-25 2002-10-15 Conexant Systems, Inc. Method and apparatus using harmonic modeling in an improved speech decoder
US6785341B2 (en) 2001-05-11 2004-08-31 Qualcomm Incorporated Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
WO2003075196A2 (en) 2002-03-05 2003-09-12 Bae Systems Plc Expertise modelling
US7502432B2 (en) 2003-07-09 2009-03-10 Broadcom Corporation Weight generation method for multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining based upon minimum bit error rate
US7336746B2 (en) 2004-12-09 2008-02-26 Qualcomm Incorporated Data transmission with spatial spreading in a MIMO communication system
SE0400370D0 (sv) 2004-02-13 2004-02-13 Ericsson Telefon Ab L M Adaptive MIMO architecture
US8542763B2 (en) 2004-04-02 2013-09-24 Rearden, Llc Systems and methods to coordinate transmissions in distributed wireless systems via user clustering
US7346115B2 (en) 2004-04-22 2008-03-18 Qualcomm Incorporated Iterative eigenvector computation for a MIMO communication system
US20050250544A1 (en) 2004-05-07 2005-11-10 Stephen Grant Base station, mobile terminal device and method for implementing a selective-per-antenna-rate-control (S-PARC) technique in a wireless communications network
US8085831B2 (en) 2004-05-17 2011-12-27 Qualcomm Incorporated Interference control via selective blanking/attenuation of interfering transmissions
CN1969473B (zh) 2004-06-14 2011-02-09 三星电子株式会社 多输入多输出移动通信系统中控制传输模式的装置和方法
EP3313001A1 (en) 2004-06-22 2018-04-25 Apple Inc. Closed loop mimo systems and methods
ATE442022T1 (de) 2004-07-13 2009-09-15 Alcatel Lucent Verfahren zur endgeräteunterstützen interferenzkontrolle in einem mehrträger- mobilkommunikationssystem
US7978649B2 (en) 2004-07-15 2011-07-12 Qualcomm, Incorporated Unified MIMO transmission and reception
KR101151130B1 (ko) 2004-08-17 2012-06-04 삼성전자주식회사 완전 다이버시티 완전 데이터 레이트 시공간 블록 부호를 이용한 데이터 송수신 방법 및 장치
KR20060038812A (ko) 2004-11-01 2006-05-04 엘지전자 주식회사 다중입출력 시스템의 선행 코딩 행렬 정보 전송 방법 및이를 이용한 신호 전송 방법
KR20060043035A (ko) 2004-11-02 2006-05-15 삼성전자주식회사 개선된 다중입출력 통신 시스템 및 방법
EP1829262B1 (en) 2004-11-16 2018-03-14 QUALCOMM Incorporated Closed-loop rate control for a mimo communication system
KR100744274B1 (ko) 2005-01-11 2007-07-30 삼성전자주식회사 무선 통신 시스템에서 데이터 버스트 할당 지시 방법 및시스템
JP4832087B2 (ja) 2005-01-26 2011-12-07 パナソニック株式会社 無線基地局装置及び端末装置
KR100922958B1 (ko) 2005-03-14 2009-10-22 삼성전자주식회사 다중 사용자 다이버시티를 지원하는 다중 안테나 이동통신시스템에서 사용자 할당장치 및 방법
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
WO2006117665A1 (en) 2005-05-04 2006-11-09 Nortel Networks Limited Wireless feedback system and method
EP1727307B1 (en) 2005-05-25 2011-05-04 Mitsubishi Electric R&D Centre Europe B.V. Coding matrix in a MIMO system
US7428269B2 (en) 2005-06-01 2008-09-23 Qualcomm Incorporated CQI and rank prediction for list sphere decoding and ML MIMO receivers
KR101038477B1 (ko) 2005-09-20 2011-06-03 맥스테크 커뮤니케이션 네트웍스 리미티드 실시간 피어 투 피어 네트워크
US20070076810A1 (en) 2005-09-30 2007-04-05 Herrera Alfonso R System and method for selecting transmission format using effective SNR
US20070165738A1 (en) 2005-10-27 2007-07-19 Barriac Gwendolyn D Method and apparatus for pre-coding for a mimo system
US20070099578A1 (en) 2005-10-28 2007-05-03 Kathryn Adeney Pre-coded diversity forward channel transmission system for wireless communications systems supporting multiple MIMO transmission modes
KR20070108304A (ko) 2005-10-31 2007-11-09 삼성전자주식회사 다중 송수신 안테나 시스템에서의 채널 품질 정보 송수신방법 및 장치
WO2007074376A2 (en) 2005-12-27 2007-07-05 Nokia Corporation Priority based transmission based on channel quality using power sequencing
US9071435B2 (en) 2005-12-29 2015-06-30 Celeno Communications Ltd. System and method for tuning transmission parameters in multi-user multiple-input-multiple-output systems with aged and noisy channel estimation
EP1981198B1 (en) 2006-02-02 2017-06-28 Fujitsu Limited Radio transmitting method, radio transmitter and radio receiver
US8059609B2 (en) 2006-03-20 2011-11-15 Qualcomm Incorporated Resource allocation to support single-user and multi-user MIMO transmission
US10044532B2 (en) 2006-03-20 2018-08-07 Texas Instruments Incorporated Pre-coder selection based on resource block grouping
US8914015B2 (en) 2006-03-20 2014-12-16 Qualcomm Incorporated Grouping of users for MIMO transmission in a wireless communication system
US7804800B2 (en) 2006-03-31 2010-09-28 Intel Corporation Efficient training schemes for MIMO based wireless networks
US8031745B2 (en) 2006-04-20 2011-10-04 Texas Instruments Incorporated Downlink synchronization channel and methods for cellular systems
US7751368B2 (en) 2006-05-01 2010-07-06 Intel Corporation Providing CQI feedback to a transmitter station in a closed-loop MIMO system
TWI449389B (zh) 2006-05-09 2014-08-11 內數位科技公司 通用陸地無線存取可變反饋
US20150030058A9 (en) 2006-05-17 2015-01-29 Texas Instruments Inc. Cqi feedback for mimo deployments
WO2007133051A2 (en) 2006-05-17 2007-11-22 Lg Electronics Inc. A method of implementing superposition coding for a forward link in a wireless commnication system
TWI343200B (en) 2006-05-26 2011-06-01 Lg Electronics Inc Method and apparatus for signal generation using phase-shift based pre-coding
JP5032569B2 (ja) 2006-06-20 2012-09-26 ホアウェイ・テクノロジーズ・カンパニー・リミテッド プリコード化されたｍｉｍｏ−ｏｆｄｍシステムにおいてフィードバック情報のオーバヘッドを低減させるための方法
KR101295576B1 (ko) 2006-06-22 2013-08-09 엘지전자 주식회사 위상천이 기반의 프리코딩을 이용한 데이터 전송 방법 및이를 구현하는 송신 장치
US7593729B2 (en) 2006-07-13 2009-09-22 Designart Networks Ltd Point to point link and communication method
US7941186B2 (en) 2006-07-25 2011-05-10 Samsung Electronics Co., Ltd. Apparatus and method for scheduling multiuser/single user in multiple input multiple output (MIMO) system
US7450673B2 (en) 2006-08-10 2008-11-11 Cisco Technology, Inc. System and method for improving the robustness of spatial division multiple access via nulling
KR20080016159A (ko) 2006-08-17 2008-02-21 삼성전자주식회사 통신 시스템에서의 셀 탐색 방법 및 장치
CN103986556B (zh) 2006-08-17 2019-07-02 英特尔公司 用于在mimo无线通信系统中提供有效预编码反馈的方法和设备
JP4904994B2 (ja) 2006-08-25 2012-03-28 富士通東芝モバイルコミュニケーションズ株式会社 移動無線端末装置
KR20080022033A (ko) 2006-09-05 2008-03-10 엘지전자 주식회사 프리코딩 정보 피드백 방법 및 프리코딩 방법
KR20080026019A (ko) 2006-09-19 2008-03-24 엘지전자 주식회사 위상천이 기반의 프리코딩 방법 및 이를 지원하는 송수신기
US8102931B2 (en) 2006-09-29 2012-01-24 Apple Inc. Method and device for operating a precoded MIMO system
US7702029B2 (en) 2006-10-02 2010-04-20 Freescale Semiconductor, Inc. MIMO precoding enabling spatial multiplexing, power allocation and adaptive modulation and coding
US8503560B2 (en) 2006-10-02 2013-08-06 Samsung Electronics Co., Ltd System and method for performing precoding in a wireless communication system
US20080080635A1 (en) 2006-10-02 2008-04-03 Nokia Corporation Advanced feedback signaling for multi-antenna transmission systems
CN101166052B (zh) 2006-10-19 2012-05-23 株式会社Ntt都科摩 一种多输入多输出系统的预编码方法及使用该方法的设备
US7920511B2 (en) 2006-10-31 2011-04-05 Samsung Electronics Co., Ltd. Method and system for managing channels in a wireless communication system
JP2008118411A (ja) 2006-11-06 2008-05-22 Nec Corp 無線受信装置
US8305948B2 (en) 2006-11-15 2012-11-06 Qualcomm Incorporated Transmissions to multiple stations in wireless communication systems
KR100961745B1 (ko) 2006-11-27 2010-06-07 삼성전자주식회사 릴레이 방식을 사용하는 무선통신시스템에서 채널정보 통신장치 및 방법
US20080130778A1 (en) 2006-12-04 2008-06-05 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed high definition video data using a transfer matrix for beamforming estimation
JP2008147792A (ja) 2006-12-06 2008-06-26 Mitsubishi Electric Corp 無線通信装置、制御装置および無線通信システム
US8073069B2 (en) 2007-01-05 2011-12-06 Apple Inc. Multi-user MIMO-SDMA for finite rate feedback systems
KR20080073624A (ko) 2007-02-06 2008-08-11 삼성전자주식회사 다중 편파 다중 입출력 시스템을 위한 코드북 생성 방법 및그 장치
US8780771B2 (en) 2007-02-06 2014-07-15 Qualcomm Incorporated Cyclic delay diversity and precoding for wireless communication
WO2008100214A1 (en) 2007-02-13 2008-08-21 Telefonaktiebolaget Lm Ericsson (Publ) Methods and systems for combined cyclic delay diversity and precoding of radio signals
KR100951089B1 (ko) 2007-02-15 2010-04-05 삼성전자주식회사 무선통신 시스템에서 시간 분할 복신 및 주파수 분할복신을 선택적으로 지원하기 위한 장치
FI20075142A0 (fi) 2007-02-26 2007-02-26 Nokia Corp Monipistelähetys
US7809074B2 (en) 2007-03-16 2010-10-05 Freescale Semiconductor, Inc. Generalized reference signaling scheme for multi-user, multiple input, multiple output (MU-MIMO) using arbitrarily precoded reference signals
JP4739259B2 (ja) 2007-03-19 2011-08-03 株式会社日立製作所 無線通信方法
EP2605466A3 (en) 2007-03-21 2013-11-06 InterDigital Technology Corporation MIMO wireless communication method and apparatus for transmitting and decoding resource block structures based on a dedicated reference signal mode
US8411732B2 (en) 2007-03-21 2013-04-02 Qualcomm Incorporated Fast square root algorithm for MIMO equalization
EP2130308B1 (en) 2007-03-22 2018-12-19 Marvell World Trade Ltd. Variable codebook for mimo system
US8787469B2 (en) 2007-04-04 2014-07-22 Samsung Electronics Co., Ltd. Method for codebook design and beamforming vector selection in per-user unitary rate control (PU2RC) system
WO2008133582A2 (en) 2007-04-30 2008-11-06 Telefonaktiebolaget L M Ericsson (Publ) Method and arrangement for adapting a multi-antenna transmission
US7965689B2 (en) 2007-05-14 2011-06-21 Motorola Mobility, Inc. Reference sequence construction for fast cell search
US8259824B2 (en) 2007-05-23 2012-09-04 Texas Instruments Incorporated Nested precoding codebook structures for MIMO systems
US7649831B2 (en) 2007-05-30 2010-01-19 Samsung Electronics Co., Ltd. Multi-user MIMO feedback and transmission in a wireless communication system
US8179775B2 (en) 2007-08-14 2012-05-15 Texas Instruments Incorporated Precoding matrix feedback processes, circuits and systems
KR100938756B1 (ko) 2007-07-06 2010-01-26 엘지전자 주식회사 무선통신 시스템에서 셀 탐색 과정을 수행하는 방법
KR100921769B1 (ko) 2007-07-12 2009-10-15 한국전자통신연구원 하향링크 프레임 생성 방법 및 셀 탐색 방법
WO2009037580A2 (en) 2007-07-16 2009-03-26 Nortel Networks Limited Providing space division multiple access in a wireless network
US8798183B2 (en) 2007-08-13 2014-08-05 Qualcomm Incorporated Feedback and rate adaptation for MIMO transmission in a time division duplexed (TDD) communication system
US8320486B2 (en) 2007-09-28 2012-11-27 Apple Inc. Retransmission method for HARQ in MIMO systems
US8553624B2 (en) 2007-10-10 2013-10-08 Samsung Electronics Co., Ltd. Asynchronous hybrid ARQ process indication in a MIMO wireless communication system
US20090110114A1 (en) 2007-10-26 2009-04-30 Eko Nugroho Onggosanusi Open-Loop MIMO Scheme and Signaling Support for Wireless Networks
US20090122857A1 (en) 2007-11-09 2009-05-14 Interdigital Patent Holdings, Inc. Method and apparatus for performing rank overriding in long term evolution networks
JP5409388B2 (ja) 2007-12-25 2014-02-05 パナソニック株式会社 無線通信装置、無線通信基地局装置及び無線通信移動局装置
KR101430470B1 (ko) 2008-01-04 2014-08-19 엘지전자 주식회사 Ｈａｒｑ 방식을 이용하는 다중 안테나 시스템에서 신호재전송 방법
US9130612B2 (en) 2008-01-07 2015-09-08 Qualcomm Incorporated Unified uplink control signal formats
JP5269098B2 (ja) 2008-01-14 2013-08-21 テレフオンアクチーボラゲット エル エム エリクソン（パブル） Ｍｉｍｏ通信における開ループ事前符号化器循環
ES2684765T3 (es) * 2008-03-19 2018-10-04 Huawei Technologies Co., Ltd. Dispositivo de estación móvil, dispositivo de estación base, método de comunicación y sistema de comunicación
US8559879B2 (en) 2008-04-22 2013-10-15 Qualcomm Incorporated Null pilots for interference estimation in a wireless communication network
KR101481584B1 (ko) 2008-06-24 2015-01-13 엘지전자 주식회사 전송 블록-코드워드 매핑 관계 규정 방법 및 이를 이용한 하향링크 신호 전송 방법
CN104601504B (zh) 2008-07-01 2018-12-04 爱立信电话股份有限公司 在mimo电信系统中使用预编码矩阵的方法和设备
GB2464447B (en) 2008-07-01 2011-02-23 Toshiba Res Europ Ltd Wireless communications apparatus
US8098750B2 (en) 2008-07-10 2012-01-17 Infineon Technologies Ag Method and device for transmitting a plurality of data symbols
US20100019631A1 (en) * 2008-07-22 2010-01-28 Metro Industries Inc. Secure storage system having mobile shelving units
KR101056614B1 (ko) 2008-07-30 2011-08-11 엘지전자 주식회사 다중안테나 시스템에서 데이터 전송방법
US8204151B2 (en) 2008-08-06 2012-06-19 Samsung Electronics Co., Ltd. Methods and apparatus to generate multiple antennas transmit precoding codebook
US9294160B2 (en) * 2008-08-11 2016-03-22 Qualcomm Incorporated Method and apparatus for supporting distributed MIMO in a wireless communication system
US8555145B2 (en) 2008-09-04 2013-10-08 Apple Inc. Systems and methods of encoding using a reduced codebook with adaptive resetting
US8208936B2 (en) 2008-09-04 2012-06-26 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatus for improving cell-edge data throughput in a wireless communications system
US8170592B2 (en) 2008-09-12 2012-05-01 Broadcom Corporation Method and system for frame timing acquisition in evolved universal terrestrial radio access (EUTRA)
US20100067512A1 (en) 2008-09-17 2010-03-18 Samsung Electronics Co., Ltd. Uplink transmit diversity schemes with 4 antenna ports
US8948704B2 (en) 2008-10-22 2015-02-03 Qualcomm Incorporated Scope of channel quality reporting region in a multi-carrier system
US8934395B2 (en) 2008-10-24 2015-01-13 Qualcomm Incorporated Method and apparatus for uplink network MIMO in a wireless communication system
EP2182754B1 (en) 2008-10-30 2014-01-15 Telefonaktiebolaget LM Ericsson (publ) Method and receiver for estimating and reporting a channel quality measure
WO2010050874A1 (en) 2008-11-03 2010-05-06 Telefonaktiebolaget L M Ericsson (Publ) Method for transmission of reference signals and determination of precoding matrices for multi-antenna transmission
US8780829B2 (en) 2008-12-11 2014-07-15 Lg Electronics Inc. Method for transmitting and receiving a comp reference signal in a multi-cell environment
US8638871B2 (en) 2008-12-22 2014-01-28 Motorola Mobility Llc System and method for combination multiple input, multiple output (MIMO) and beamforming
WO2010076778A1 (en) 2009-01-05 2010-07-08 Marvell World Trade Ltd Precoding codebooks for mimo communication systems
US8204470B2 (en) 2009-01-06 2012-06-19 Texas Instruments Incorporated Predecoding for joint processing coordinated multi-point transmission
US8385441B2 (en) 2009-01-06 2013-02-26 Marvell World Trade Ltd. Efficient MIMO transmission schemes
US8428177B2 (en) 2009-02-25 2013-04-23 Samsung Electronics Co., Ltd. Method and apparatus for multiple input multiple output (MIMO) transmit beamforming
US8238483B2 (en) 2009-02-27 2012-08-07 Marvell World Trade Ltd. Signaling of dedicated reference signal (DRS) precoding granularity
KR101633326B1 (ko) 2009-02-27 2016-06-24 엘지전자 주식회사 전송 방법
US8401480B2 (en) 2009-03-04 2013-03-19 Lg Electronics Inc. Method for performing CoMP operation and transmitting feedback information in a wireless communication system
KR20140023419A (ko) 2009-03-17 2014-02-26 노키아 지멘스 네트웍스 오와이 물리 업링크 공유 채널（ｐｕｓｃｈ） 상의 주기적 피드백 정보의 전송 구성
EP2409423B1 (en) 2009-03-19 2013-12-11 Telefonaktiebolaget LM Ericsson (publ) Mimo transceiver controlling a repeater according to performance parameters
US20100238984A1 (en) 2009-03-19 2010-09-23 Motorola, Inc. Spatial Information Feedback in Wireless Communication Systems
EP3512219B1 (en) 2009-04-06 2022-05-04 Marvell Asia Pte, Ltd. Improved feedback strategies for multi-user mimo communication systems
US8325843B2 (en) 2009-04-08 2012-12-04 Lg Electronics Inc. MIMO codebook generation
US20100260234A1 (en) 2009-04-09 2010-10-14 Motorola, Inc. Closed-loop transmission feedback in wireless communication systems
KR101276859B1 (ko) 2009-04-15 2013-06-18 엘지전자 주식회사 참조 신호를 전송하는 방법 및 장치
US8543063B2 (en) 2009-04-21 2013-09-24 Marvell World Trade Ltd. Multi-point opportunistic beamforming with selective beam attenuation
US8917707B2 (en) 2009-04-24 2014-12-23 Samsung Electronics Co., Ltd. Techniques for channel state information feedback in wireless communication system
US8238277B2 (en) 2009-04-27 2012-08-07 Mitsubishi Electric Research Laboratories, Inc. Parametric compression of rank-1 analog feedback
US8208434B2 (en) 2009-04-28 2012-06-26 Motorola Mobility, Inc. Method of signaling particular types of resource elements in a wireless communication system
WO2010126317A2 (en) 2009-04-30 2010-11-04 Lg Electronics Inc. Method for setting precoder in open loop mimo system
US9178658B2 (en) 2009-05-06 2015-11-03 Futurewei Technologies, Inc. System and method for channel interleaver and layer mapping in a communications system
KR101618283B1 (ko) 2009-05-22 2016-05-04 삼성전자주식회사 통합 다중 포인트 통신을 위한 정보 피드백 방법
KR101751995B1 (ko) 2009-06-19 2017-06-28 엘지전자 주식회사 다중 안테나 시스템에서 공간 채널 공분산(ｓｐａｔｉａｌ ｃｈａｎｎｅｌｃｏｖａｒｉａｎｃｅ)를 이용하여 피드백 오버헤드를 최소화 하는 방법
US8427978B2 (en) 2009-07-16 2013-04-23 Futurewei Technologies, Inc. System and method for information feedback in a wireless communications system with coordinated multiple point transmission
US8462647B2 (en) 2009-07-28 2013-06-11 Broadcom Corporation Method and system for multiple frequency hypothesis testing with full synch acquisition in an E-UTRA/LTE UE receiver
US9014138B2 (en) 2009-08-07 2015-04-21 Blackberry Limited System and method for a virtual carrier for multi-carrier and coordinated multi-point network operation
CN101631004B (zh) 2009-08-10 2014-05-28 中兴通讯股份有限公司 一种预编码方法、系统及预编码码本的构造方法
EP2484028B1 (en) 2009-09-30 2023-02-01 LG Electronics Inc. Apparatus and method for transmitting uplink control information
US8923905B2 (en) 2009-09-30 2014-12-30 Qualcomm Incorporated Scrambling sequence initialization for coordinated multi-point transmissions
US9667378B2 (en) 2009-10-01 2017-05-30 Telefonaktiebolaget Lm Ericsson (Publ) Multi-granular feedback reporting and feedback processing for precoding in telecommunications
US8873650B2 (en) 2009-10-12 2014-10-28 Motorola Mobility Llc Configurable spatial channel information feedback in wireless communication system
US8447005B2 (en) 2009-11-05 2013-05-21 Telefonaktiebolaget L M Ericsson (Publ) Frequency synchronization methods and apparatus
JP5669854B2 (ja) * 2009-11-09 2015-02-18 マーベル ワールド トレード リミテッド 調整送信を利用する基地局にフィードバックデータを送信するための方法及び装置、並びに調整送信スキームを利用する基地局及びフィードバックデータを送信する移動通信端末を備えたシステム
CN102668669B (zh) 2009-11-19 2015-11-25 交互数字专利控股公司 多载波系统中的分量载波激活/去激活
JP5314584B2 (ja) 2009-12-09 2013-10-16 株式会社日立製作所 セルラ無線通信システム、無線基地局装置及び無線端末装置
EP2333970B1 (en) 2009-12-10 2012-07-18 Telefonaktiebolaget L M Ericsson (publ) Technique for determining a cell-identity
WO2011073876A2 (en) 2009-12-17 2011-06-23 Marvell World Trade Ltd Mimo feedback schemes for cross-polarized antennas
EP2522099A4 (en) 2010-01-07 2014-12-31 Marvell World Trade Ltd SIGNALING OF DEDICATED REFERENCE SIGNAL PRECODING GRANULARITY (DRS)
ES2539227T3 (es) 2010-01-08 2015-06-29 Huawei Technologies Co., Ltd. Comunicación de información de estado de canal
KR101754970B1 (ko) 2010-01-12 2017-07-06 삼성전자주식회사 무선 통신 시스템의 채널 상태 측정 기준신호 처리 장치 및 방법
MX2011010548A (es) 2010-01-12 2012-09-28 Zte Corp Metodo y sistema para retroalimentacion de informacion de estado de canal espacial basado en un producto de kronecker.
US8619542B2 (en) 2010-01-15 2013-12-31 Motorola Mobility Llc Closed-loop feedback in wireless communications system
US20120329502A1 (en) 2010-01-15 2012-12-27 Frank Frederiksen Feedback Signaling
US9148205B2 (en) 2010-01-25 2015-09-29 Qualcomm Incorporated Feedback for supporting SU-MIMO and MU-MIMO operation in wireless communication
KR101567018B1 (ko) 2010-02-09 2015-11-06 삼성전자주식회사 네트워크 백홀 환경 및 기지국 협력 수준 기반 ｍｉｍｏ／ｄｓｍ 동작 모드 결정 시스템
JP5258002B2 (ja) 2010-02-10 2013-08-07 マーベル ワールド トレード リミテッド Ｍｉｍｏ通信システムにおける装置、移動通信端末、チップセット、およびその方法
WO2011100467A2 (en) 2010-02-10 2011-08-18 Marvell World Trade Ltd. Transmission protection for wireless communications
KR101276855B1 (ko) 2010-03-08 2013-06-18 엘지전자 주식회사 프리코딩 행렬 정보 전송방법 및 사용자기기와, 프리코딩 행렬 구성방법 및 기지국
CN102792606B (zh) 2010-03-16 2015-07-22 瑞典爱立信有限公司 开环与闭环多流传送之间的切换方法及设备
KR20110111855A (ko) 2010-04-05 2011-10-12 주식회사 팬택 채널상태정보 피드백 장치와 그 방법, 기지국
KR101506922B1 (ko) 2010-04-07 2015-03-30 알까뗄 루슨트 정보 피드백 및 프리코딩을 위한 방법 및 장치
US20110250919A1 (en) 2010-04-13 2011-10-13 Qualcomm Incorporated Cqi estimation in a wireless communication network
KR101843019B1 (ko) 2010-04-30 2018-03-29 삼성전자주식회사 여러 리포팅 모드를 지원하는 다중 입출력 통신 시스템
US8848817B2 (en) 2010-04-30 2014-09-30 Texas Instruments Incorporated Transmission modes and signaling for uplink MIMO support or single TB dual-layer transmission in LTE uplink
US8509338B2 (en) 2010-05-05 2013-08-13 Motorola Mobility Llc Method and precoder information feedback in multi-antenna wireless communication systems
EP2391081B1 (en) 2010-05-25 2013-01-02 Telefonaktiebolaget L M Ericsson (PUBL) Technique for cell signature determination
WO2011158921A1 (en) 2010-06-14 2011-12-22 Sharp Kabushiki Kaisha User equipment, base station apparatus, communication system and mobile communication methods for uplink control information
US8934557B2 (en) 2010-06-30 2015-01-13 Telefonaktiebolaget L M Ericsson (Publ) Statistical joint precoding in multi-cell, multi-user MIMO
US8520576B2 (en) 2010-08-04 2013-08-27 Broadcom Corporation Explicit feedback format within single user, multiple user, multiple access, and/or MIMO wireless communications
CN102377712B (zh) 2010-08-05 2014-07-02 中兴通讯股份有限公司 辅同步信号检测方法和装置
EP3267751B1 (en) 2010-08-09 2022-03-02 Samsung Electronics Co., Ltd. Transmission of harq control information from a user equipment for downlink carrier aggregation
WO2012019813A1 (en) 2010-08-12 2012-02-16 Nokia Siemens Networks Oy Methods and devices for exchanging data in a communications network
WO2012019361A1 (zh) 2010-08-13 2012-02-16 富士通株式会社 下行控制信息发送方法、接收方法及装置、终端、基站和通信系统
KR101806878B1 (ko) 2010-08-16 2018-01-10 삼성전자주식회사 8 개의 전송 안테나들에 대한 코드북 및 그 코드북을 사용하는 통신 시스템
US9509391B2 (en) 2010-09-08 2016-11-29 Qualcomm Incorporated Sounding feedback schemes for very high throughput wireless systems
US9042841B2 (en) 2010-09-17 2015-05-26 Samsung Electronics Co., Ltd. System and method for PUCCH subband feedback signaling in a wireless network
US8687555B2 (en) 2010-09-29 2014-04-01 Lg Electronics Inc. Method and apparatus for performing effective feedback in wireless communication system supporting multiple antennas
JP2012100254A (ja) 2010-10-06 2012-05-24 Marvell World Trade Ltd Ｐｕｃｃｈフィードバックのためのコードブックサブサンプリング
US8615052B2 (en) 2010-10-06 2013-12-24 Marvell World Trade Ltd. Enhanced channel feedback for multi-user MIMO
US8908600B2 (en) 2010-10-26 2014-12-09 Qualcomm Incorporated Channel state information feedback frame format and feedback rules for very high throughput wireless systems
US9130631B2 (en) 2010-11-03 2015-09-08 Qualcomm Incorporated Beamforming feedback format
US8687727B2 (en) 2010-11-05 2014-04-01 Intel Corporation Coordinated multi-point transmission using interference feedback
KR101846044B1 (ko) 2011-02-11 2018-04-05 인터디지탈 패튼 홀딩스, 인크 향상된 제어 채널을 위한 시스템 및 방법
US8537911B2 (en) 2011-02-21 2013-09-17 Motorola Mobility Llc Method and apparatus for reference signal processing in an orthogonal frequency division multiplexing communication system
CA2827866C (en) 2011-02-25 2016-07-12 Blackberry Limited Determining device in-range proximity
WO2012119626A1 (en) 2011-03-08 2012-09-13 Panasonic Corporation Propagation delay difference reporting for multiple component carriers
JP6019502B2 (ja) 2011-03-31 2016-11-02 マーベル ワールド トレード リミテッド 協調マルチポイント送信のためのチャネルフィードバック
US8750358B2 (en) 2011-04-06 2014-06-10 Nec Laboratories America, Inc. Method for improving multiuser MIMO downlink transmissions
US20130083681A1 (en) 2011-09-30 2013-04-04 Research In Motion Limited Methods of Channel State Information Feedback and Transmission in Coordinated Multi-Point Wireless Communications System
US8902921B2 (en) 2011-08-16 2014-12-02 Mediatek Singapore Pte Ltd. Methods for inter-user interference indication feedback and usage in MU-MIMO wireless systems
US8923146B2 (en) 2011-08-31 2014-12-30 Nokia Corporation Channel reservation procedure
GB2496178B (en) 2011-11-04 2013-10-09 Renesas Mobile Corp Processing system, method and computer program for multipoint communications
GB2496198B (en) 2011-11-07 2014-03-19 Broadcom Corp Apparatus, methods and computer programs for coordinated multipoint transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090161605A1 (en) 2004-12-07 2009-06-25 Adaptix, Inc. Cooperative mimo in multicell wireless networks
US20070153731A1 (en) 2006-01-05 2007-07-05 Nadav Fine Varying size coefficients in a wireless local area network return channel
US20080192852A1 (en) * 2007-02-12 2008-08-14 Mark Kent Method and system for an alternating channel delta quantizer for 2x2 mimo pre-coders with finite rate channel state information feedback
EP2665200A1 (en) 2010-01-29 2013-11-20 Qualcomm Incorporated Reporting of channel information to support coordinated multi-point data transmission

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
"CoMP Operation Based on Spatial Covariance Feedback and Performance Results of Coordinated SU/MU Beamforming", 3GPP TSG RAN DOCUMENT RI-092634, 29 June 2009 (2009-06-29)
"Coordinated Beamforming with DL MU-MIMO", 3GPP TSG RAN DOCUMENT R1-093474, 24 June 2009 (2009-06-24)
"DL performance of LTE-A: FDD", 3GPP TSG RAN DOCUMENT R1-093132, 24 August 2009 (2009-08-24)
"Feedback in Support of DL CoMP: General i", 3GPP TSG RAN DOCUMENT R1-093109, 24 August 2004 (2004-08-24)
"System Performance Comparisons of Several DL CoMP schemes", 3GPP TSG RAN DOCUMENT RI-093833, 12 October 2009 (2009-10-12)
LTE SPECTRAL EFFICIENCY AND IMT-ADVANCED REQUIREMENTS, 24 August 2009 (2009-08-24)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2795827A4 (en) * 2011-12-20 2016-01-13 Marvell World Trade Ltd REFERENCE SIGNAL DESIGN FOR COORDINATED MULTIPORT TRANSMISSION
CN104969637B (zh) * 2011-12-20 2018-08-10 马维尔国际贸易有限公司 用于通信的方法和装置
EP2637438A1 (en) * 2012-03-09 2013-09-11 Alcatel Lucent Apparatus and Method for Communicating with a First Transmission Point and with a Second Transmission Point and Apparatus and Method for Coordinating a Downstream Transmission from a First and a Second Transmission Point
CN103378891A (zh) * 2012-04-25 2013-10-30 中兴通讯股份有限公司 基于全局预编码的业务传输方法及系统、用户设备及基站
CN103378891B (zh) * 2012-04-25 2017-11-24 中兴通讯股份有限公司 基于全局预编码的业务传输方法及系统、用户设备及基站
CN104283655A (zh) * 2013-07-10 2015-01-14 财团法人工业技术研究院 传送及接收混合自动重传请求回传的方法
EP2824862A3 (en) * 2013-07-10 2015-02-25 Industrial Technology Research Institute Method of handling HARQ feedbacks
US9479293B2 (en) 2013-07-10 2016-10-25 Industrial Technology Research Institute Method of handling HARQ feedbacks and related communication device
US9706537B2 (en) 2013-07-10 2017-07-11 Industrial Technology Research Institute Method of handling HARQ feedbacks and related communication device
CN104283655B (zh) * 2013-07-10 2018-05-18 财团法人工业技术研究院 传送及接收混合自动重传请求回传的方法
RU2560965C1 (ru) * 2014-03-05 2015-08-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный университет систем управления и радиоэлектроники" Способ изготовления проходного вакуумного изолятора высокого напряжения

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