The present invention relates generally to communication systems, and particularly to methods and systems for providing channel feedback in wireless communication systems.
In some communication systems, a mobile communication terminal receives downlink signals from a base station over a communication channel, and sends feedback indicative of the communication channel to the base station. The base station configures subsequent transmissions based on the feedback. Channel feedback of this sort is used, for example, in Evolved Universal Terrestrial Radio Access (E-UTRA) systems specified by the 3rd Generation Partnership Project (3GPP). These systems are also referred to as Long Term Evolution (LTE) and LTE Advanced (LTE-A).
Channel feedback schemes for LTE and LTE-A systems are discussed, for example, in 3GPP Technical Specification Group Radio Access Network Working Group 1 (TSG-RAN WG1) document R1-104473, entitled “Way Forward on 8Tx Codebook for Rel. 10 DL MIMO,” Madrid, Spain, Aug. 23-27, 2010; in 3GPP TSG-RAN WG1 document R1-105067, entitled “Way Forward on CSI Feedback for Rel. 10 DL MIMO,” Madrid, Spain, Aug. 23-27, 2010; in 3GPP TSG-RAN WG1 document R1-103839, entitled “Design and Evaluation of Precoder Codebooks for CSI Feedback,” Dresden, Germany, Jun. 28-Jul. 2, 2010; and in 3GPP TSG-RAN WG1 document R1-104353, entitled “Two-Component PMI Codebook for 8TX,” Madrid, Spain, Aug. 23-27, 2010, which are all incorporated herein by reference.
The description above is presented as a general overview of related art in this field and should not be construed as an admission that any of the information it contains constitutes prior art against the present patent application.
An embodiment that is described herein provides a method in a mobile communication terminal. The method includes holding a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal The precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a long-term sub-codebook and a short-term sub-codebook. The definition defines a first subset of the long-term sub-codebook and a second subset of the short-term sub-codebook. A Multiple-Input Multiple-Output (MIMO) signal is received in the terminal via multiple receive antennas. Based on the received MIMO signal, a precoding matrix is selected from the sub-sampled codebook for precoding subsequent MIMO signals transmitted to the terminal. The precoding feedback indicating the selected precoding matrix is calculated.
In some embodiments, the method includes transmitting the precoding feedback from the terminal. In a disclosed embodiment, transmitting the precoding feedback includes sending the precoding feedback over a Physical Uplink Control Channel (PUCCH). In an embodiment, sending the precoding feedback includes formatting the precoding feedback using a number of bits that is less than a total number of bits allocated to the precoding feedback in the PUCCH.
In an embodiment, the long-term sub-codebook and the short-term sub-codebook are each formed of sixteen precoding matrices having first indices {0 . . . 15} and second indices {0 . . . 15}, respectively, the first subset is formed of eight precoding matrices having the first indices {0,2,4,6,8,10,12,14} in the long-term sub-codebook, and the second subset is formed of two precoding matrices having the second indices {0,2} or four precoding matrices having the second indices {0,1,2,3}. In another embodiment, the long-term sub-codebook and the short-term sub-codebook are each formed of sixteen precoding matrices having first indices {0 . . . 15} and second indices {0 . . . 15}, respectively, the first subset is formed of eight precoding matrices having the first indices {0,2,4,6,8,10,12,14} in the long-term sub-codebook, and the second subset is formed of two precoding matrices having the second indices {0,1}.
In yet another embodiment, the long-term sub-codebook and the short-term sub-codebook are each formed of sixteen precoding matrices having first indices {0 . . . 15} and second indices {0 . . . 15}, respectively, the first subset is formed of eight precoding matrices having the first indices {0,2,4,6,8,10,12,14} in the long-term sub-codebook, and the second subset is formed of four precoding matrices having the second indices {0,2,8,10}. In still another embodiment, both the long-term sub-codebook and the first subset are formed of sixteen precoding matrices having first indices {0 . . . 15}, both the short-term sub-codebook and the second subset are formed of sixteen precoding matrices having second indices {0 . . . 15}, and selecting the precoding matrix includes selecting from the first subset a first precoding matrix, and selecting from the second subset a second precoding matrix whose second index is a modulo 2 or modulo 4 of a first index of the first precoding matrix.
In an embodiment, the method includes transmitting the precoding feedback and indicating in the precoding feedback only the first index and not the second index. In a disclosed embodiment, calculating the precoding feedback includes choosing one of the precoding matrices from the first subset and combining an indication of the chosen precoding matrix with a Rank Indication (RI) to produce four or five bits of the precoding feedback. In an embodiment, the combined indication of the chosen precoding matrix and the RI includes five bits, the long-term sub-codebook is formed of sixteen precoding matrices having indices {0 . . . 15}, and choosing the precoding matrix includes choosing the matrix from among the precoding matrices having the indices {0,2,4,6,8,10,12,14}. In an embodiment, selecting the precoding matrix includes selecting a respective first precoding matrix from the first subset of the long-term sub-codebook, and selecting a respective second precoding matrix from the second subset of the short-term sub-codebook.
There is additionally provided, in accordance with an embodiment that is described herein, apparatus including a memory, a receiver and processing circuitry. The memory is configured to hold a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal The precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a long-term sub-codebook and a short-term sub-codebook, and the definition defines a first subset of the long-term sub-codebook and a second subset of the short-term sub-codebook. The receiver is configured to receive a Multiple-Input Multiple-Output (MIMO) signal via multiple receive antennas. The processing circuitry is configured to select from the sub-sampled codebook a precoding matrix for precoding subsequent MIMO signals, and to calculate the precoding feedback indicating the selected precoding matrix.
In some embodiments, a mobile communication terminal includes the disclosed apparatus. In some embodiments, a chipset for processing signals in a mobile communication terminal includes the disclosed apparatus.
The present disclosure will be more fully understood from the following detailed description of the embodiments thereof, taken together with the drawings in which:
Embodiments that are described herein provide improved channel feedback schemes for use in LTE, LTE-A and any other suitable mobile wireless communication networks. In some embodiments, a mobile communication terminal (referred to as a User Equipment—UE) receives a downlink Multiple-Input Multiple Output (MIMO) signal from a base station. The received downlink signal is typically precoded with a certain precoding scheme—A set of weights that are applied to the base station antennas. Each precoding scheme is typically represented by a precoding matrix. Based on the received downlink signal, the UE calculates precoding feedback that is indicative of the precoding matrix preferred by the UE for precoding subsequent transmissions by the base station. The UE then transmits the precoding feedback to the base station.
In an embodiment, the UE selects the preferred precoding matrix from a codebook that is agreed upon between the UE and the base station, and the precoding feedback indicates the index of the selected precoding matrix in the codebook. This sort of feedback is sometimes referred to as Precoding Matrix Indication (PMI). In LTE Release 10, for example, a codebook for the case of eight base station antennas (8TX) is defined in 3GPP TSG-RAN WG1 document R1-104473, cited above. Typically, the codebook is defined per rank, i.e., per each number of simultaneous data streams (also referred to as spatial streams or spatial layers) that are transmitted from the base station to the UE in the downlink MIMO signal.
In some embodiments, the UE transmits the precoding feedback to the base station, possibly along with other types of feedback, over a Physical Uplink Control Channel (PUCCH). The PUCCH has only a limited number of bits for allocating to feedback information. Therefore, in the disclosed embodiments, the UE uses a sub-sampled codebook that is selected from a certain master codebook in order to reduce the feedback bandwidth. The disclosed embodiments provide several examples of sub-sampled precoding codebooks for use over the PUCCH in various operational modes.
In some embodiments, the master codebook is made-up of a combination of a long-term sub-codebook denoted W1 and a short-term sub-codebook denoted W2, and each precoding scheme comprises a combination of a precoding matrix selected from the long-term sub-codebook and a precoding matrix selected from the short-term sub-codebook. Generally, the long-term sub-codebook typically represents the component of the precoding operation that changes relatively slowly, and the short-term sub-codebook represents the component of the precoding operation that changes more quickly. In these embodiments, each sub-sampled codebook is defined as a combination of a subset of the long-term sub-codebook and a subset of the short-term sub-codebook.
In some embodiments, the UE is configured to provide the precoding feedback in one of several predefined Channel State Information (CSI) modes. In a disclosed embodiment, the UE holds multiple sub-sampled codebooks corresponding to various ranks and CSI modes. The UE calculates the precoding feedback by first selecting the appropriate sub-sampled codebook for the applicable rank and CSI mode, and then chooses the preferred precoding matrix from the selected sub-sampled codebook. Several examples of sub-sampled codebooks for various ranks and CSI modes are described in detail below.
The methods and systems described herein optimize the sub-sampling of the master codebook, so as to provide accurate precoding feedback using the limited bandwidth resources of the PUCCH. By providing accurate precoding feedback, the disclosed techniques enable the base station to increase the downlink throughput.
In the embodiments described herein, system 20 operates in accordance with the LTE-A specifications. Alternatively, however, system 20 may operate in accordance with any other suitable communication protocol.
The example of
UE 24 comprises one or more antennas 32 for receiving downlink MIMO signals from BS 28 and for transmitting uplink signals to the BS. A downlink receiver (RX) 36 receives the downlink signals and an uplink transmitter (TX) 40 transmits the uplink signals. UE 24 further comprises processing circuitry 44 and a memory 48. Memory 48 holds a definition of sub-sampled long-term and short-term sub-codebooks, a respective pair of sub-sampled long- and short-term sub-codebooks per each rank and CSI mode supported by the UE. In a given pair, the long-term sub-codebook is formed of a subset of the precoding matrices in the long-term sub-codebook of the master codebook. The short-term sub-codebook in the given pair is formed of a subset of the precoding matrices in the short-term sub-codebook of the master codebook. Both subsets of precoding matrices are typically defined in advance, e.g., by simulation, so as to provide optimal precoding accuracy for the given rank and CSI mode.
In the embodiment seen in
Feedback calculation unit 60 formats precoding feedback that is indicative of the preferred precoding scheme. The precoding feedback uses some or all of the available bits in the PUCCH. Unit 60 provides the precoding feedback to uplink transmitter 40, which transmits the precoding feedback to BS 28 over the PUCCH. BS 28 typically decodes the precoding feedback from the PUCCH and uses the feedback in deciding on the precoding of subsequent downlink transmissions.
The UE configuration shown in
In various embodiments, some or all of the elements of UE 24, including downlink receiver 36, uplink transmitter 40, processing circuitry 44 and/or memory 48, are implemented in hardware, such as using one or more Radio Frequency Integrated Circuits (RFICs), Field-Programmable Gate Arrays (FPGAs) or Application-Specific Integrated Circuits (ASICs). Memory 48 comprises any suitable type of memory device, for example Random Access Memory (RAM) or non-volatile memory such as Flash memory. In alternative embodiments, certain UE elements are implemented in software, or using a combination of hardware and software elements. In some embodiments, some or all of the elements of UE 24, including receiver 36, transmitter 40, processing circuitry 44 and/or memory 48, are implemented in a signal processing chip-set for use in mobile communication terminals.
In some embodiments, certain UE elements, such as certain elements of processing circuitry 44, are implemented in a programmable processor, which is programmed in software to carry out the functions described herein. 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.
In some embodiments, the master codebook from which the various sub-sampled sub-codebooks are derived is the 8TX codebook defined in 3GPP TSG-RAN WG1 document R1-104473, cited above. This master codebook assigns the following number of bits for long-term (W1) and short-term (W2) precoding feedback, depending on rank:
In some embodiments, UE 24 reports the precoding feedback over the PUCCH in one of two predefined reporting modes, also referred to as CSI modes. The two modes are denoted “CSI 1” and “CSI 2”. These modes are defined in 3GPP TSG-RAN WG1 document R1-105067, cited above. In each reporting mode, the UE reports the W1 and W2 bits, as well as a Rank Indication (RI) and a Channel Quality Indication (CQI). The feedback is reported in two successive uplink sub-frames denoted “report 1” and “report 2”, according to the following table:
In order to fit the limited bandwidth resources of the PUCCH, UE 24 typically uses reduced-size, or sub-sampled, sub-codebooks in both reporting modes. In CSI mode 1, for example, Report 1 is typically the bottleneck since the long-term feedback (W1) should be robust to errors. In CSI mode 2, as another example, only eleven bits are available for precoding feedback. Thus, in CSI mode 1 the long-term (W1) sub-codebook should be sub-sampled, and in CSI mode 2 both the W1 and W2 sub-codebooks should be sub-sampled. Several examples of such sub-sampled sub-codebooks are described below. Simulation results related to these techniques are given in U.S. Provisional Patent Applications 61/390,511 and 61/392,431, cited above, and in 3GPP TSG-RAN WG1 document R1-105885, entitled “Details of PUCCH 1-1 for 8TX,” Jacksonville, Fla., Nov. 15-19, 2010, which is incorporated herein by reference in its entirety.
In some embodiments, the codebook sub-sampling is related to possible implementations of the base station antennas. In some base stations, the transmit antennas used for transmitting the downlink MIMO signals are arranged in a linear array of co-polarized antennas having uniform spacing. This kind of array is denoted OLA. In other base stations, the transmit antennas are arranged in two linear arrays of co-polarized antennas, such that the two arrays have a 90-degree polarization relative to one another. This kind of array is denoted X-POL.
The bits assigned for precoding feedback can be divided into bits that indicate the direction of the transmission beam (these bits are denoted Discrete Fourier Transform (DFT) bits) and bits that indicate the relative phase between the two X-POL antenna arrays (these bits are denoted X-POL bits). Generally speaking, the beam direction varies relatively slowly, while the relative phase between the X-POL antenna arrays varies more rapidly. Thus, the DFT bits are sometimes associated with the long-term (W1) feedback and the X-POL bits are sometimes associated with the short-term (W2) feedback. This heuristic relationship, although not exact, can be used for finding efficient sub-sampling of the long- and short-term sub-codebooks.
In an embodiment, for rank 1, the master codebook (denoted W) can be parameterized according to the two above-described parameters—beam angle (DFT angle) and relative X-POL phase. The sub-sampling problem thus translates to the problem of assigning the optimal number of DFT bits and X-POL bits. This sort of optimal bit allocation can be found, for example, by simulation.
In an embodiment, for the case of rank 2, in addition to the DFT angle and the relative X-POL phase, it is possible to parameterize the master codebook W according to the difference in DFT angle between the two columns of the base station precoder. In an embodiment, for a master codebook in which the DFT angle is indexed between 0 and 31, the DFT angle offset between precoder columns ranges from 0 to 3.
In some embodiments, the W1 codebook is common to both rank 1 and rank 2, and therefore the sub-sampled codebook is elected to have a common W1 sub-codebook for rank 1 and rank 2, as well. Based on these guidelines and constraints, example sub-sampled long-term (W1) and short-term (W2) sub-codebooks for rank 1 and rank 2 in CSI mode 2 are given in the following table:
In the above examples, the master codebook W is formed from a long-term sub-codebook and a short-term sub-codebook, each having sixteen precoding matrices indexed {0,1, . . . ,15}. The notation and indexing of the precoding matrices is in accordance with the definitions given in 3GPP Technical Specification TS 36.213, entitled “LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures,” version 10.2.0, Release 10, July, 2011, which is incorporated herein by reference.
In the examples of Table 3, i1 denotes the indices of the precoding matrices that are included in the sub-sampled long-term sub-codebook, and i2 denotes the indices of the precoding matrices that are included in the sub-sampled short-term sub-codebook. Note that in Embodiment III, no short-term precoding feedback is sent at all. In this embodiment, the short-term precoding feedback (i2) is deduced by the base station from the long-term precoding feedback (i1) using a modulo operation. Note also that Embodiment I and Embodiment II satisfy the nesting property, i.e., the columns of higher rank precoders are part of the lower rank precoders. For example, the columns of all the rank-2 precoders belong to the rank-1 codebook.
In some embodiments, the PUCCH has a certain number of bits available for allocation to precoding feedback, but UE 24 uses less than the available number of bits for formatting the feedback. In one example embodiment, the PUCCH has a total of eleven bits available for CSI feedback. For rank 1, four bits are used for CQI feedback, leaving seven bits for precoding feedback. In one embodiment, Feedback calculation unit 60 uses only four of the seven bits for formatting the precoding feedback (and the sub-sampled sub-codebooks are defied accordingly).
The reason for not using all of the available bits is that the probability of error in decoding the feedback at the base station grows with the actual number of bits being used. For example, the probability of errors when decoding seven bits is higher than when decoding four bits. In some practical cases, the resulting downlink throughput for seven and four bits of precoding feedback is similar. In such cases, it is preferable for UE 24 to use a smaller number of feedback bits in order to reduce the error probability.
In an embodiment, in CSI mode 2, the sub-sampled sub-codebook for rank 1 is represented using four or five bits. For four-bit sub-sampling, the sub-sampled sub-codebook is formed of the following three-bit long-term (W1) sub-codebook and a one-bit short-term (W2) sub-codebook:
For five-bit sub-sampling, the sub-sampled sub-codebook is give by:
Equations 1 and 2 use the notation of TSG-RAN WG1 document R1-104473, cited above, wherein C1 denotes the long-term sub-sampled sub-codebook. Vectors {tilde over (e)}1 and {tilde over (e)}3 denote column selectors that select the first and third columns, respectively, of a matrix left-multiplied by them. For example, A{tilde over (e)}3, produces the third column of matrix A.
For the case of no feedback errors, the sub-sampled codebook typically uses all seven available bits. The long-term sub-sampled sub-codebook in this embodiment is:
C1={W1(0), W1(2), W1(4), . . . , W1(14)} Equation 3:
and the short-term sub-sampled sub-codebook is the original short-term sub-codebook.
In an embodiment, in CSI mode 2 rank 2, the sub-sampled sub-codebooks are given by:
In an embodiment, for rank 2, the sub-sampled sub-codebook is selected to have a total of four bits, three of which comprise DFT bits and one bit comprises an X-POL bit, and an offset of 1 between the precoder columns In this embodiment, the sub-sampled sub-codebooks are given by:
The examples above refer to CSI mode 2 reporting. The following description refers to CSI mode 1 reporting. In CSI mode 1, the RI bits are encoded together with the W1 bits in the same sub-frame. In some embodiments, the UE defines the size of the sub-sampled long-term (W1) sub-codebook depending on the rank. For a given size, the long-term sub-codebook of the master codebook is typically sampled uniformly to produce the sub-sampled long-term sub-codebook.
In some embodiments, for a UE that is configured to provide feedback for up to rank 8, the size of the sub-sampled W1 sub-codebook (i.e., the number of W1 precoding matrices in the sub-sampled sub-codebook) for CSI mode 1 is given by:
The table gives the W1 sub-codebook size for two assumptions: A total of five bits allocated to the combined R1 and W1 report, and a total of four bits allocated to the combined R1 and W1 report. The error probability for four bits is lower than the error probability of five bits.
The total number of bits for the combined RI and W1 report, in accordance with an embodiment, is given in the following table as a function of the number of UE receive antennas 32:
In the above-described embodiments, either two or three bits of W1 can be combined with RI for rank 1. Example simulation results for these numbers of bits, and considering possible effects on error probability, are given in U.S. Provisional Patent Applications 61/390,511 and 61/392,431, cited above, and in 3GPP TSG-RAN WG1 document R1-105885, cited above. Various uplink error models can be used for this purpose. The simulation results use a model that is described in 3GPP TSG-RAN WG1 document R1-105886, cited above. These references are all incorporated herein by reference in their entirety.
Thus, in an embodiment, in CSI mode 1, the total allocation for RI+W1 is five bits according to the allocation given in Table 5 above. The W1 matrices are selected in these embodiments from the set of indices {0,2,4,6,8,10,12,14}.
Downlink receiver 36 receives a downlink MIMO signal from base station 28, at a reception operation 74. Sub-codebook selection unit 56 selects the appropriate sub-sampled sub-codebooks for the applicable rank and CSI mode, at a sub-codebook selection operation 78.
Based on the received downlink MIMO signal, feedback calculation unit 60 chooses a preferred pre-coding scheme from the sub-sampled codebook selected at operation 78 above. Typically, the selected sub-sampled codebook comprises a long-term sub-sampled sub-codebook and a short-term sub-sampled sub-codebook, and the chosen precoding scheme comprises a respective pair of precoding matrices, one from each sub-sampled sub-codebook.
Feedback calculation unit 60 calculates precoding feedback that is indicative of the chosen preferred precoding scheme, at a feedback calculation operation 86. Unit 60 provides the precoding feedback to uplink transmitter 40. The uplink transmitter transmits the precoding feedback to base station 28 over the PUCCH, at an uplink transmission operation 90. The base station typically configures (e.g., precodes) its subsequent downlink transmissions using the feedback.
It is noted that the embodiments described above are cited by way of example, and that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and sub-combinations of the various features described hereinabove, as well as variations and modifications thereof which would occur to persons skilled in the art upon reading the foregoing description and which are not disclosed in the prior art. Documents incorporated by reference in the present patent application are to be considered an integral part of the application except that to the extent any terms are defined in these incorporated documents in a manner that conflicts with the definitions made explicitly or implicitly in the present specification, only the definitions in the present specification should be considered.
This application claims the benefit of U.S. Provisional Patent Application 61/390,511, filed Oct. 6, 2010, and U.S. Provisional Patent Application 61/392,431, filed Oct. 12, 2010, whose disclosures are incorporated herein by reference.
Number | Name | Date | Kind |
---|---|---|---|
5231629 | Kotzin et al. | Jul 1993 | A |
5263160 | Porter, Jr. et al. | Nov 1993 | A |
5349567 | Reed | Sep 1994 | A |
5940439 | Kleider et al. | Aug 1999 | A |
6466904 | Gao et al. | Oct 2002 | B1 |
6512750 | Palenius | Jan 2003 | B1 |
6757319 | Parsa et al. | Jun 2004 | B1 |
6865237 | Boariu et al. | Mar 2005 | B1 |
7839944 | Lee et al. | Nov 2010 | B2 |
7941186 | Cho et al. | May 2011 | B2 |
8036286 | Lee et al. | Oct 2011 | B2 |
8068555 | Jongren et al. | Nov 2011 | B2 |
8098750 | Mueck et al. | Jan 2012 | B2 |
8179775 | Chen et al. | May 2012 | B2 |
8325844 | Walton et al. | Dec 2012 | B2 |
20020001333 | Glasheen et al. | Jan 2002 | A1 |
20030035491 | Walton et al. | Feb 2003 | A1 |
20050108281 | Kim et al. | May 2005 | A1 |
20050141630 | Catreaux et al. | Jun 2005 | A1 |
20050157810 | Raleigh et al. | Jul 2005 | A1 |
20050237920 | Howard et al. | Oct 2005 | A1 |
20050250544 | Grant et al. | Nov 2005 | A1 |
20050276317 | Jeong et al. | Dec 2005 | A1 |
20060014554 | Gerlach | Jan 2006 | A1 |
20060056538 | Nam et al. | Mar 2006 | A1 |
20060093060 | Jung et al. | May 2006 | A1 |
20060114858 | Walton et al. | Jun 2006 | A1 |
20060153112 | Lim et al. | Jul 2006 | A1 |
20060203777 | Kim et al. | Sep 2006 | A1 |
20060233131 | Gore et al. | Oct 2006 | A1 |
20060276212 | Sampath et al. | Dec 2006 | A1 |
20070058746 | Gueguen | Mar 2007 | A1 |
20070076810 | Herrera et al. | Apr 2007 | A1 |
20070099578 | Adeney et al. | May 2007 | A1 |
20070149229 | Frederiksen et al. | Jun 2007 | A1 |
20070153731 | Fine | Jul 2007 | A1 |
20070160162 | Kim et al. | Jul 2007 | A1 |
20070165738 | Barriac et al. | Jul 2007 | A1 |
20070217540 | Onggosanusi et al. | Sep 2007 | A1 |
20070223422 | Kim et al. | Sep 2007 | A1 |
20070223423 | Kim et al. | Sep 2007 | A1 |
20070230373 | Li et al. | Oct 2007 | A1 |
20070248068 | Onggosanusi et al. | Oct 2007 | A1 |
20070253386 | Li et al. | Nov 2007 | A1 |
20070270170 | Yoon et al. | Nov 2007 | A1 |
20080013610 | Varadarajan et al. | Jan 2008 | A1 |
20080025336 | Cho et al. | Jan 2008 | A1 |
20080039067 | Jin et al. | Feb 2008 | A1 |
20080043702 | Moon et al. | Feb 2008 | A1 |
20080049709 | Pan et al. | Feb 2008 | A1 |
20080080364 | Barak et al. | Apr 2008 | A1 |
20080080632 | Kim et al. | Apr 2008 | A1 |
20080080634 | Kotecha et al. | Apr 2008 | A1 |
20080080635 | Hugl et al. | Apr 2008 | A1 |
20080080637 | Khan et al. | Apr 2008 | A1 |
20080095258 | She et al. | Apr 2008 | A1 |
20080101407 | Khan et al. | May 2008 | A1 |
20080108310 | Tong et al. | May 2008 | A1 |
20080112351 | Surineni et al. | May 2008 | A1 |
20080130778 | Xia et al. | Jun 2008 | A1 |
20080144522 | Chang et al. | Jun 2008 | A1 |
20080165875 | Mundarath et al. | Jul 2008 | A1 |
20080186212 | Clerckx et al. | Aug 2008 | A1 |
20080192852 | Kent et al. | Aug 2008 | A1 |
20080198776 | Seo | Aug 2008 | A1 |
20080232494 | Pan et al. | Sep 2008 | A1 |
20080232503 | Kim | Sep 2008 | A1 |
20080247364 | Kim et al. | Oct 2008 | A1 |
20080247475 | Kim et al. | Oct 2008 | A1 |
20080268855 | Hanuni et al. | Oct 2008 | A1 |
20080268887 | Jansen et al. | Oct 2008 | A1 |
20080285433 | Akita et al. | Nov 2008 | A1 |
20080292013 | Varadarajan et al. | Nov 2008 | A1 |
20080298452 | Sampath et al. | Dec 2008 | A1 |
20080298482 | Rensburg et al. | Dec 2008 | A1 |
20080318606 | Tsutsui et al. | Dec 2008 | A1 |
20090011761 | Han et al. | Jan 2009 | A1 |
20090016263 | Kishigami et al. | Jan 2009 | A1 |
20090046800 | Xu et al. | Feb 2009 | A1 |
20090098876 | Khan et al. | Apr 2009 | A1 |
20090110114 | Onggosanusi et al. | Apr 2009 | A1 |
20090122857 | Li et al. | May 2009 | A1 |
20090161605 | Shen et al. | Jun 2009 | A1 |
20090180561 | Kim et al. | Jul 2009 | A1 |
20090252332 | Chang et al. | Oct 2009 | A1 |
20090252333 | Chang et al. | Oct 2009 | A1 |
20090282310 | Seok et al. | Nov 2009 | A1 |
20090296844 | Ihm et al. | Dec 2009 | A1 |
20090304109 | Kotecha | Dec 2009 | A1 |
20100031117 | Lee et al. | Feb 2010 | A1 |
20100034308 | Kim et al. | Feb 2010 | A1 |
20100035627 | Hou et al. | Feb 2010 | A1 |
20100054354 | Tosato | Mar 2010 | A1 |
20100056170 | Lindoff et al. | Mar 2010 | A1 |
20100061477 | Lee et al. | Mar 2010 | A1 |
20100067512 | Nam et al. | Mar 2010 | A1 |
20100069106 | Swarts et al. | Mar 2010 | A1 |
20100074301 | Howard et al. | Mar 2010 | A1 |
20100103834 | Gorokhov et al. | Apr 2010 | A1 |
20100158151 | Krauss et al. | Jun 2010 | A1 |
20100172424 | Perets et al. | Jul 2010 | A1 |
20100172430 | Melzer et al. | Jul 2010 | A1 |
20100173639 | Li et al. | Jul 2010 | A1 |
20100215112 | Tsai et al. | Aug 2010 | A1 |
20100220800 | Erell et al. | Sep 2010 | A1 |
20100238984 | Sayana et al. | Sep 2010 | A1 |
20100254474 | Gomadam et al. | Oct 2010 | A1 |
20100260234 | Thomas et al. | Oct 2010 | A1 |
20100260243 | Ihm et al. | Oct 2010 | A1 |
20100267341 | Bergel et al. | Oct 2010 | A1 |
20100271968 | Liu et al. | Oct 2010 | A1 |
20100272014 | Orlik et al. | Oct 2010 | A1 |
20100272032 | Sayana et al. | Oct 2010 | A1 |
20100273514 | Koo et al. | Oct 2010 | A1 |
20100278278 | Lee et al. | Nov 2010 | A1 |
20100284484 | Jongren et al. | Nov 2010 | A1 |
20100290548 | Hoshno et al. | Nov 2010 | A1 |
20100296603 | Lee et al. | Nov 2010 | A1 |
20110019631 | Kotecha et al. | Jan 2011 | A1 |
20110026413 | Swarts et al. | Feb 2011 | A1 |
20110034175 | Fong et al. | Feb 2011 | A1 |
20110058621 | Clerckx et al. | Mar 2011 | A1 |
20110064156 | Kim et al. | Mar 2011 | A1 |
20110077038 | Montojo et al. | Mar 2011 | A1 |
20110080969 | Jongren et al. | Apr 2011 | A1 |
20110085610 | Zhuang et al. | Apr 2011 | A1 |
20110096704 | Erell et al. | Apr 2011 | A1 |
20110103534 | Axmon et al. | May 2011 | A1 |
20110110403 | Jongren | May 2011 | A1 |
20110110450 | Gomadam et al. | May 2011 | A1 |
20110150052 | Erell et al. | Jun 2011 | A1 |
20110164701 | Nikopourdeilami et al. | Jul 2011 | A1 |
20110170435 | Kim et al. | Jul 2011 | A1 |
20110170638 | Yuan et al. | Jul 2011 | A1 |
20110188393 | Mallik et al. | Aug 2011 | A1 |
20110194594 | Noh et al. | Aug 2011 | A1 |
20110194638 | Erell et al. | Aug 2011 | A1 |
20110194644 | Liu et al. | Aug 2011 | A1 |
20110205930 | Rahman et al. | Aug 2011 | A1 |
20110216846 | Lee et al. | Sep 2011 | A1 |
20110235608 | Koo et al. | Sep 2011 | A1 |
20110250919 | Barbieri et al. | Oct 2011 | A1 |
20110261775 | Kim et al. | Oct 2011 | A1 |
20110268204 | Choi et al. | Nov 2011 | A1 |
20110274188 | Sayana et al. | Nov 2011 | A1 |
20110306341 | Klein et al. | Dec 2011 | A1 |
20120002568 | Tiirola et al. | Jan 2012 | A1 |
20120020433 | Bhattad et al. | Jan 2012 | A1 |
20120033592 | Kim et al. | Feb 2012 | A1 |
20120033630 | Chung et al. | Feb 2012 | A1 |
20120039369 | Choi et al. | Feb 2012 | A1 |
20120058735 | Vermani et al. | Mar 2012 | A1 |
20120063336 | Shany et al. | Mar 2012 | A1 |
20120069887 | Park et al. | Mar 2012 | A1 |
20120069917 | Liu et al. | Mar 2012 | A1 |
20120076028 | Ko et al. | Mar 2012 | A1 |
20120087435 | Gomadam et al. | Apr 2012 | A1 |
20120134434 | Chen et al. | May 2012 | A1 |
20120219042 | Onggosanusi et al. | Aug 2012 | A1 |
20120219083 | Tong et al. | Aug 2012 | A1 |
20120257664 | Yue et al. | Oct 2012 | A1 |
20120275376 | Sampath et al. | Nov 2012 | A1 |
20120275386 | Frenne et al. | Nov 2012 | A1 |
20120281620 | Sampath et al. | Nov 2012 | A1 |
20130028068 | Park et al. | Jan 2013 | A1 |
20130028344 | Chen et al. | Jan 2013 | A1 |
20130039284 | Marinier et al. | Feb 2013 | A1 |
20130051256 | Ong et al. | Feb 2013 | A1 |
20130107916 | Liu et al. | May 2013 | A1 |
20130176991 | Yi | Jul 2013 | A1 |
20130182786 | Frenne et al. | Jul 2013 | A1 |
Number | Date | Country |
---|---|---|
2182754 | May 2010 | EP |
2008236222 | Feb 2008 | JP |
2008054125 | Mar 2008 | JP |
2008118411 | May 2008 | JP |
2008147792 | Jun 2008 | JP |
2005117283 | Dec 2005 | WO |
2007133564 | Nov 2007 | WO |
2008009157 | Jan 2008 | WO |
2008133582 | Nov 2008 | WO |
2009116471 | Sep 2009 | WO |
2010013950 | Feb 2010 | WO |
2011147692 | Dec 2011 | WO |
Entry |
---|
Huang et al., “A Limited Feedback Precoding System with Hierarchical Codebook and Linear Receiver”, IEEE Transactions on Wireless Communications, vol. 7, No. 12, pp. 4843-4848, Dec. 2008. |
Kim et al., “Efficient Feedback via Subs pace-Based Channel Quantization for Distributed Cooperative Antenna Systems with Temporarily Correlated Channels”, EURASIP Journal on Advances in Signal Processing, vol. 2008, Nov. 23, 2007. |
NTT DOCOMO, “Views on Codebook Design for Downlink 8Tx MIMO”, 3GPP TSG RAN WG1 Meeting #59bis, Valencia, Spain, Jan. 18-22, 2010. |
Alcatel Lucent, “Overview of Hierarchical Codebook Approach”, 3GPP TSG RAN WG1 Meeting #59bis, Valencia, Spain, Jan. 18-22, 2009. |
JP Patent Application # 2011-024295 Official Action dated Sep. 11, 2012. |
Samsung, “Precoding for polarized 4Tx configurations”, 3GPP TSG RAN WG1 Meeting #48bis, St Julian's, Malta, Mar. 26-30, 2007. |
Mondal et al., “Rank-Independent Codebook Design from a Quaternary Alphabet”, Proceedings of 41st Asilomar Conference on Signals, Systems and Computers (ACSSC), pp. 297-301, Nov. 7, 2007. |
JP Patent Application # 2011-544111 Official Action dated Nov. 6, 2012. |
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Requirements for Further Advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) (LTE-Advanced) (Release 8), 3GPP TR 36.913 V8.0.1, Sophia Antipolis, France, Mar. 2009. |
Motorola, “Uplink Power Control for E-UTRA”, 3GPP TSG RAN1 #48, St. Louis, USA, Feb. 12-16, 2007. |
Nortel, “On the discussions of carrier aggregations”, 3GPP TSG-RAN Working Group 1 Meeting #55, Prague, Czech Republic, Nov. 10-14, 2008. |
NTT DOCOMO, Inc., “Updated Views on Support of Wider Bandwidth in LTE-Advanced”, 3GPP TSG RAN WG1 Meeting #54bis, Prague, Czech Republic, Sep. 29-Oct. 3, 2008. |
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; User Equipment (UE) radio transmission and reception (FDD) (Release 8), 3GPP TS 25.101 V8.5.1, Sophia Antipolis, France, Jan. 2009. |
Lucent Technologies, “Link Error Prediction for E-DCH”, TSG-RAN WG1#35, Lisbon, Portugal, Nov. 17-21, 2003. |
Ericsson, “On Channel Reciprocity for Enhanced DL Multi-Antenna Transmission”, TSG-RAN WG1 #59, Jeju, Korea, Nov. 9-13, 2009. |
Ericsson, “System-level evaluation of OFDM—further considerations”, TSG-RAN WG1 #35, Lisbon, Portugal, Nov. 17-21, 2003. |
Nortel Networks, “OFDM Exponential Effective SIR Mapping Validation, EESM Simulation Results for System-Level Performance Evaluations, and Text Proposal for Section A.4.5 of TR 25.892”, 3GPP TSG-RAN-1/TSG-RAN-4 Ad Hoc, Espoo, Finland, Jan. 27-30, 2004. |
Park et al., “Efficient Coherent Neighbour Cell Search for Synchronous 3GPP LTE System”, Electronic Letters, vol. 44, No. 21, Oct. 2008. |
Motorola, “Low-Overhead Feedback of Spatial Covariance Matrix”, TSG-RAN WG1 #59, Jeju, Korea, Nov. 9-13, 2009. |
Motorola, “Use of UL Covariance for Downlink MIMO in FDD”, TSG-RAN WG1 #59, Jeju, Korea, Nov. 9-13, 2009. |
3rd Generation Partnership Project, “Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding (Release 8)”, 3GPP TS 36.212 V8.6.0 (Mar. 2009), Sophia Antipolis, France. |
Samsung, “Discussion on Enhanced DL Beamforming”, 3GPP TSG RAN WG1 Meeting #56bis, Seoul, Korea, Mar. 23-27, 2009. |
Alcatel-Lucent Shanghai Bell, “Correlation-based Explicit Feedback”, 3GPP TSG RAN WG1 Meeting # 59bis, Valencia, Spain, Jan. 18-22, 2010. |
International Application PCT/IB2010/051088 Search Report dated Sep. 21, 2010. |
International Application PCT/IB2010/053272 Search report dated Dec. 27, 2010. |
Motorola, “Codebook for 8Tx DL SU-MIMO for LTE-1”, TSG-RAN WG1 #59, Jeju, Korea, Nov. 9-13, 2009. |
Marvell Semiconductor, “Precoding Options for 8Tx Antennas in LTE-A DL”, 3GPP TSG RAN WG1 Meeting #55bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
U.S. Appl. No. 13/052,075, filed Mar. 20, 2011. |
Marvell, “Codebook Adaptation for ULA Antenna”, 3GPP TSG RAN WG1 Meeting #60, San Francisco, USA, Feb. 22-22, 2010. |
U.S. Appl. No. 61/321,386, filed Apr. 6, 2010. |
U.S. Appl. No. 61/294,737, filed Mar. 13, 2010. |
U.S. Appl. No. 12/902,168, filed Oct. 12, 2010. |
U.S. Appl. No. 12/903,237, filed Oct. 13, 2010. |
Alcatel-Lucent, “Fractional Power Control Using Pilot Power Ration Measurements for the E-UTRA Uplink”, 3GPP TSG RAN WG1 # 48, St. Louis, USA, Feb. 12-16, 2007. |
Alcatel-Lucent Shanghai Bell, “Considerations on spatial covariance aided implicit feedback for MU-MIMO”, 3GPP TSG RAN WG1 Meeting #59, Jeju, Korea, Nov. 9-13, 2009. |
Catt, “Feedback enhancements for LTE-A downlink transmission”, 3GPP TSG RAN WG1 Meeting #59, Jeju, Korea, Nov. 9-13, 2009. |
U.S. Appl. No. 13/346,737, filed Jan. 10, 2012. |
U.S. Appl. No. 13/433,293, filed Mar. 29, 2012. |
Ericsson et al., “Way Forward for Rel-10 Feedback Framework”, 3GPP TSG RAN WG1 Meeting #60, San Francisco, USA, Feb. 22-22, 2010. |
Huawei, “Adaptive Feedback: A New Perspective of the Adaptive Codebook”, 3GPP TSG RAN WG1 meeting #58, Shenzhen, China, Aug. 24-28, 2009. |
Motorola, “Interference Mitigation via Power Control and FSM Resource Allocation and UE Alignment for E-UTRA Uplink and TP”, 3GPPP TSG RAN1 # 44, Denver, USA, Feb. 13-17, 2006. |
Marvell, “Successive Codebook Refinement: Further details and evaluation”, 3GPP TSG-RAN WG1 #60bis, Beijing, Apr. 12-16, 2010. |
Marvell Semiconductor, “Feedback Methods for Exploiting Channel Correlation in LTE-A DL”, 3GPP TSG RAN WG1 Meeting #57, Los Angeles, USA, Jun. 29-Jul. 3, 2009. |
Marvell Semiconductor, “Spatial Correlation based transmission schemes for LTE-A DL”, 3GPP TSG RAN WG1 meeting #58, Shenzhen, China, Aug. 24-28, 2009. |
Samsung, “Comparisons and performance evaluation of differential feedback proposals for Rel 8 PMI enhancements”, 3GPP TSG RAN WG1 Meeting #59bis, Valencia, Spain, Jan. 18-22, 2010. |
Samsung, “Codebook Design for 8 Tx Transmission in LTE-A”, 3GPP TSG RAN WG1 Meeting #56, Athens, Greece, Feb. 9-13, 2009. |
International Application PCT/IB2009/052987 Search Report dated Jan. 27, 2010. |
Rapporteur (NTT DOCOMO), “Text Proposal for RAN1 TR on LTE Advanced”, 3GPP TSG RAN WG1 Meeting #53bis, Warsaw, Poland, Jun. 30-Jul. 4, 2008. |
Ericsson, “Design and Evaluation of Precoder Codebooks for CSI Feedback”, 3GPP TSG RAN WG1 61bis, Dresden, Germany, Jun. 28-Jul. 2, 2010. |
Samsung, “Coordinated Multi-Point Operation for LTE”, TSG RAN WG1 50, Istanbul, Turkey, Dec. 7-10, 2010. |
Alcatel-Lucent et al., “Way Forward on CSI Feedback for Re1.10 DL MIMO”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
Alcatel-Lucent et al., “Further Analysis of Companion Feedback Performance and Feedback Signaling Overhead Reduction”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
Alcatel-Lucent et al., “Way Forward on CQI/PMI Reporting Enhancement on PUSCH 3-1 for 2, 4 and 8 TX”, 3GPP TSG RAN WG1 62bis, Xian, China, Oct. 11-15, 2010. |
Marvell, “CQI Enhancement for 4Tx”, 3GPP TSG-RAN WG1 #62bis, Xian, Oct. 11-15, 2010. |
NEC Group, “Enhancing MU-MIMO CQI,” 3GPP TSG-RAN WGI #62bis, Xian, China, Oct. 11-15, 2010. |
LG Electronics, “Further Discussion on CQI/PMI Enhancement”, 3GPP TSG RAN # 62BIS, Xian, China, Oct. 11-15, 2010. |
Marvell, “Two-Component PMI Codebook for 8TX”, 3GPP TSG RAN # 62 Meeting, Madrid, Spain, Aug. 23-27, 2010. |
Marvell, “Details of PUCCH 1-1 for 8Tx”, 3GPP TSG RAN # 63, Jacksonville, USA, Nov. 15-19, 2010. |
Alcatel-Lucent et al., “Way Forward on Enhancement for Re1.10 DL MIMO”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
Samsung, “Preliminary CoMP JP Results for Homogeneous Networks”, 3GPP TSG RAN # 64, Taipei, Taiwan, Feb. 21-25, 2011. |
Huawei, “Performance Evaluation of Phase 1: Downlink Homogeneous Network with High Tx Power RRHs”, 3GPP TSG RAN # 64, Taipei, Taiwan, Feb. 21-25, 2011. |
ZTE, “Initial CoMP Evaluation for Homogeneous Network with High Tx Power RRHs”, 3GPP TSG RAN # 64, Taipei, Taiwan, Feb. 21-25, 2011. |
U.S. Appl. No. 12/723,647 Official Action dated Feb. 6, 2012. |
U.S. Appl. No. 12/723,647 Official Action dated Apr. 27, 2012. |
U.S. Appl. No. 12/652,044 Official Action dated Feb. 7, 2012. |
Alcatel-Lucent et al., “Way Forward on 8Tx Codebook for Re1.10 DL MIMO”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
U.S. Appl. No. 12/477,152 Official Action dated Jun. 26, 2012. |
U.S. Appl. No. 12/723,645 Official Action dated Aug. 31, 2012. |
U.S. Appl. No. 12/723,647 Official Action dated Aug. 17, 2012. |
U.S. Appl. No. 12/652,044 Official Action dated Jun. 29, 2012. |
U.S. Appl. No. 12/838,509 Official Action dated Jun. 21, 2012. |
U.S. Appl. No. 13/023,555 Official Action dated Sep. 14, 2012. |
International Application PCT/IB2012/051511 Search Report dated Aug. 31, 2012. |
U.S. Appl. No. 13/610,904, filed Sep. 12, 2012. |
3GPP TR 36.819 “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Coordinated Multi-Point Operation for LTE Physical Layer Aspects (release 11)”, version 11.0.0, Sep. 2011. |
International Application No. PCT/IB2009/052726 Search Report dated Jan. 28, 2010. |
International Application No. PCT/IB2010/050014 Search Report dated Jun. 15, 2010. |
International Application No. PCT/IB2010/050797 Search Report dated Jul. 15, 2010. |
International Application No. PCT/IB2010/051089 Search Report dated Jul. 9, 2010. |
Ericsson, “Carrier Aggregation in LTE-Advanced”, TSG-RAN WG1 #53bis, Warsaw, Poland, Jun. 30-Jul. 4, 2008. |
Viswanath et al., “Opportunistic Beamforming Using Dumb Antennas,” IEEE Transactions on Information Theory, vol. 48, No. 6, pp. 1277-1294, Jun. 2002. |
Sharif et al., “On the Capacity of MIMO Broadcast Channels with Partial Side Information,” IEEE Transactions on Information Theory, vol. 51, No. 2, pp. 506-522, Feb. 2005. |
Texas Instruments, “Codebook Design for E-UTRA MIMO Pre-coding”, 3GPP TSG RAN WG1 46bis, Seoul, Korea, Oct. 9-13, 2006. |
Samsung, “Codebook based Precoding for 8 Tx Transmission in LTE-A”, 3GPP TSG RAN WG1 Meeting #55, Prague, Czech Republic, Nov. 10-14, 2008. |
Qualcomm Europe, “Link Analysis for 4×2 and 4×4 Precoder Set Decision”, 3GPP TSG-RAN WG1 #48bis, St. Julian's, Malta, Mar. 26-30, 2007. |
3GPP TR 25.892 V6.0.0, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Feasibility Study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement (Release 6)”, Sophia Antipolis, France, Jun. 2004. |
Samsung, “CQI reporting for MU-MIMO”, 3GPP TSG RAN WG1 Meeting #54, Jeju, Korea, Aug. 18-22, 2008. |
Motorola, “Some Results on DL-MIMO Enhancements for LTE-A”, TSG-RAN WG1 #55bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
Alcatel-Lucent, ““Best Companion” reporting for improved single-cell MU-MIMO pairing”, 3GPP TSG RAN WG1 #56 Meeting, Athens, Greece, Feb. 9-13, 2009. |
Nokia Siemens Networks, “LTE-Advanced SU-MIMO UE Transmission in LTE Release 8 Network”, 3GPP TSG RAN WG1 Meeting #57, San Francisco, USA, May 4-8, 2009. |
3GPP TS 25.214 V8.5.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Procedures (FDD) (Release 8), Sophia Antipolis, France, Mar. 2009. |
IEEE Standard 802.16 for Local and metropolitan area networks, “Part 16: Air Interface for Fixed Broadband Wireless Access Systems”, Revision of IEEE Standard 802.16—2001, IEEE Computer Society and IEE Microwave Theory and Techniques Society, USA, Oct. 1, 2004. |
NTT DOCOMO et al., “Prioritized Deployment Scenarios for LTE-Advanced Studies”, 3GPP TSG RAN WG4 Meeting # 50, Athens, Greece, Feb. 9-13, 2009. |
Hanzo et al., “OFDM and MCCDMA for Broadband Multi-User Communications, WLANs and Broadcasting”, Wiley-IEEE Press, chapter 14, pp. 485-548, Sep. 19, 2003. |
China Mobile et al., “Framework for LTE PDSCH DRS Demodulation Requirements”, 3GPP TSG RAN WG4 Meeting #49, Prague, Czech Republic, Nov. 10-14, 2008. |
Qualcomm Europe, “Downlink RS Structure in Support of Higher-Order MIMO”, 3GPP TSG RAN WG1 Meeting #57, San Francisco, USA, May 4-8, 2009. |
“RAN1 Chairman Notes”, 3GPP TSG RAN WG1 Meeting #55bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
Marvell Semiconductor, “Number of Codewords for 8×8 SU-MIMO in LTE-A DL”, 3GPP TSG RAN WG1 Meeting #55bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
LG Electronics, “Consideration of DL-MIMO in LTE-Advanced”, 3GPP TSG RAN WG1 Meeting #55, Prague, Czech Republic, Nov. 10-14, 2008. |
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Further Advancements for E-UTRA Physical Layer Aspects (Release 9), 3GPP TS 36.814 V0.4.1 (Feb. 2009), Sophia Antipolis, France. |
ETSI TS 136213, “LTE; Evolved Universal Terrestrial Radio Access (E-UTRA), Physical Layer Procedures”, V10.2.0, Jun. 2011. |
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8), 3GPP TS 36.211 V8.4.0 (Sep. 2008), Sophia Antipolis, France. |
Alcatel-Lucent, “CQI and CSI Feedback Compression”, 3GPP TSG RAN WG1 #54bis, Prague, Czech Republic, Sep. 29-Oct. 3, 2008. |
Huawei, “DL MIMO Codebook”, 3GPP TSG RAN WG1 Meeting #56bis, Seoul, South Korea, Mar. 23-27, 2009. |
Huawei, “Adaptive Codebook Designs for MU-MIMO”, 3GPP TSG RAN WG1 Meeting #56bis, Seoul, South Korea, Mar. 23-27, 2009. |
Motorola, “On UE Feedback to Support LTE-A MU-MIMO and CoMP Operations”, TSG-RAN WG1 #56bis, Seoul, South Korea, Mar. 23-27, 2009. |
Huawei, “Adaptive Codebook Designs for DL MIMO”, 3GPP TSG RAN WG1 Meeting #57, San Francisco, CA USA, May 3-8, 2009. |
Ericsson, “On CSI feedback for ITU Requirement Fulfilling CoMP Schemes”, TSG-RAN WG1 #57, San Francisco, USA, May 4-8, 2009. |
Motorola, “Spatial Correlation Feedback to Support LTE-A MU-MIMO and CoMP: System Operation and Performance Results”, TSG-RAN WG1 #57, San Francisco, USA, May 4-8, 2009. |
Xia et al., “Design and Analysis of Transmit—Beamforming based on Limited-Rate Feedback”, IEEE Transactions on signal processing (Draft), Minneapolis, MN, Mar. 16, 2005. |
Huawei, “The Impact of CA on Mobility in LTE-A”, 3GPP TSG RAN WG1 Meeting #56, Athens, Greece, Feb. 9-13, 2009. |
U.S. Appl. No. 61/111,475, filed Nov. 5, 2008. |
Research in Motion, UK Limited, “Uplink Power Control for Carrier Aggregation”, 3GPP TSG RAN WG1 Meeting # 57b, Lon Angeles, USA, Jun. 29-Jul. 3, 2009. |
Nokia Siemens Networks, “PUSCH Power Control for LTE-Advanced”, 3GPP TSG RAN WG1 Meeting # 57bis, Los Angeles, USA, Jun. 29-Jul. 3, 2009. |
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Radio Frequency (RF) System Scenarios (Release 5), 3GPP TR 25.942 V5.3.0, Sophia Antipolis, France, Jun. 2004. |
Nokia Siemens Networks, “Autonomous Component Carrier Selection for LTE Advanced”, 3GPP TSG RAN WG1 Meeting #54, Jeju Island, Korea, Aug. 18-22, 2008. |
Nokia Siemens Networks, “Algorithms and Results for Autonomous Component Carrier Selection for LTE-Advanced”, 3GPP TSG RAN WG1 Meeting #55, Prague, Czech Republic, Nov. 10-14, 2008. |
Nokia Siemens Networks, “Use of Background Interference Matrix for Autonomous Component Carrier Selection for LTE-Advanced”, 3GPP TSG RAN WG1 Meeting #55-bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
Qualcomm Europe, Notion of Anchor Carrier in LTE-A', 3GPP TSG RAN WG1 Meeting #55-bis, Ljubljana, Slovenia, Jan. 12-16, 2009. |
Samsung, “UL Transmission Power Control in LTE-A”, 3GPP TSG RAN WG1 Meeting #56bis, Seoul, Korea, Mar. 23-27, 2009. |
International Application PCT/IB2010/055763 Search Report dated Jun. 14, 2011. |
International Application PCT/IB2011/050015 Search Report dated Jul. 5, 2011. |
Marvell, “Downlink MIMO with Coordinated Beamforming and Scheduling”, 3GPP TSG RAN WG1 59, Jeju, South Korea, Nov. 9-14, 2009. |
Texas Instruments, “Views and Simulation Results on 4Tx Codebook Enhancement”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
Texas Instruments, “Higher CSI feedback accuracy for 4/8Tx Re1.10 DL MIMO”, 3GPP TSG RAN WG1 62, Madrid, Spain, Aug. 23-27, 2010. |
Japanese Patent Application # 2011-544111 Office Action dated Mar. 12, 2013. |
U.S. Appl. No. 12/253,078, Office Action dated May 23, 2013. |
ZTE, “Link Analysis of 4Tx Codebook Design for DL SL-MIMO”, 3GPP TSG-RAN WG1 #48bis, St. Julians, Malta, Mar. 26-30, 2007. |
Asahi, H., “A Function Generator for Walsh Order Hadamard Matrix and Fast Walsh-Hadamard Transform”, Geoinformatics, vol. 11, No. 1, pp. 3-9, year 2000. |
U.S. Appl. No. 12/965,878 Official Action dated Apr. 1, 2013. |
U.S. Appl. No. 13/023,555 Office Action dated Feb. 5, 2013. |
International Application PCT/IB2012/056181 Search Report dated Mar. 4, 2013. |
International Application PCT/IB2012/056289 Search Report dated Mar. 26, 2013. |
International Application PCT/IB2012/056182 Search Report dated Feb. 26, 2013. |
Japanese Patent Application # 2011024295 Office Action dated Jan. 15, 2013. |
JP Patent Application # 2011-551560 Office Action dated Oct. 29, 2013. |
JP Patent Application # 2012-506601 Office Action dated Oct. 22, 2013. |
U.S. Appl. No. 12/902,168 Office Action dated Aug. 5, 2013. |
U.S. Appl. No. 12/983,898 Office Action dated Sep. 12, 2013. |
U.S. Appl. No. 13/052,075 Office Action dated Jul. 15, 2013. |
U.S. Appl. No. 13/766,790 Office Action dated Jul. 22, 2013. |
U.S. Appl. No. 12/903,237 Office Action dated Aug. 16, 2013. |
International Application PCT/IB2013/052963 Search Report dated Sep. 27, 2013. |
U.S. Appl. No. 12/965,878 Office Action dated Oct. 24, 2013. |
U.S. Appl. No. 13/052,075 Notice of Allowance dated Nov. 8, 2013. |
U.S. Appl. No. 12/965,878 Notice of Allowance dated Feb. 10, 2014. |
U.S. Appl. No. 13/543,835 Office Action dated Nov. 22, 2013. |
U.S. Appl. No. 13/669,476 Office Action dated Mar. 31, 2014. |
U.S. Appl. No. 14/179,593 Office Action dated Apr. 9, 2014. |
U.S. Appl. No. 12/903,237 Office Action dated Feb. 27, 2014. |
JP Application # 2012537460 Office Action dated Jan. 21, 2014. |
NTT DoCoMo, 3GPP TSG RAN WG1, “Views on Scalable CSI Feedback for DL CoMP in LTE-Advanced”, Meeting #58bis, R1-094243, pp. 1-5, Oct. 12-16, 2009. |
NTT DoCoMo, 3GPP TSG RAN WG1, “Views on Single-Cell CSI Feedback Enhancement for DL MU-MIMO in LTE-Advanced”, Meeting #58bis, R1-094241, pp. 1-6, Oct. 12-16, 2009. |
U.S. Appl. No. 13/669,477 Official Action dated Apr. 14, 2014. |
Number | Date | Country | |
---|---|---|---|
20120087425 A1 | Apr 2012 | US |
Number | Date | Country | |
---|---|---|---|
61390511 | Oct 2010 | US | |
61392431 | Oct 2010 | US |