WO2012151737A1 - 用户设备、基站、远端无线头选择方法 - Google Patents
用户设备、基站、远端无线头选择方法 Download PDFInfo
- Publication number
- WO2012151737A1 WO2012151737A1 PCT/CN2011/073778 CN2011073778W WO2012151737A1 WO 2012151737 A1 WO2012151737 A1 WO 2012151737A1 CN 2011073778 W CN2011073778 W CN 2011073778W WO 2012151737 A1 WO2012151737 A1 WO 2012151737A1
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- WIPO (PCT)
- Prior art keywords
- antenna
- precoding matrix
- user equipment
- matrix
- unit
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
Definitions
- the present invention relates to the field of wireless communications, and more particularly to a wireless communication system having a remote wireless head. Background technique
- LTE-A Long-term Evolution-Advanced Heterogeneous Network system consists of Macro Cell, Femto Cell, Pico Cell, Remote Wireless Head (RRH: Remote Radio Head), repeater (Relay).
- RRH Remote Radio Head
- the RRH itself does not have a signal processing capability, and the RRH forwards the signal based on the base station, and transmits the signal of the base station in the form of radio waves indiscriminately, and the transmission power is smaller than the transmission power of the base station.
- Figure 1 is a schematic diagram of the distribution of base stations and RRHs.
- the base station is located at the center of the cell. Within the coverage of the base station, there are seven RRHs, wherein the RRHs are evenly distributed at the edge positions of the cells, and the RRHs are directly connected to the base stations through optical cables.
- the signal sent by the base station can be forwarded.
- the general base station determines the RRH serving the user equipment according to the location of the UE and the RRH, and notifies the user equipment of the antenna to be measured.
- the antennas of the base station can be distributed over a plurality of RRHs, the number of antennas used by the base station can be reduced, and the number of antennas to be measured by the antenna can be reduced.
- the user equipment UE receives the signals from the base station and the RRH or the signals from the multiple RRHs, the received signals are combined, which is equivalent to macro diversity, and the strength of the user end signal is enhanced by the combination of the signals, which improves the strength. System performance.
- the inventors have found that the above-mentioned technologies have the following problems:
- a service device When the user equipment is served by a plurality of devices (RRH or base station, hereinafter also referred to as a service device), at the user equipment UE, sometimes there are service devices.
- the power of the signal is small, and sometimes the signal of the service device is small relative to the signal power of other service devices.
- the signal of the service device with little or relatively small power has no benefit to the receiving performance of the user equipment UE, even This can cause interference, causing performance degradation, and it takes a certain amount of power when transmitting the signal of the user equipment UE at the RRH end.
- the present invention has been made in view of the above circumstances of the conventional art, and at least one advantageous option is provided to overcome or alleviate one or more disadvantages due to limitations or disadvantages of the prior art.
- a user equipment includes: a storage unit, where the storage unit stores a codebook, where the codebook includes a precoding matrix having 0 elements corresponding to the antenna; a precoding matrix selecting unit that selects a precoding matrix to be used by using a codebook stored in the storage unit; and a reporting unit that reports an index of the precoding matrix selected by the precoding matrix selecting unit.
- a base station includes: a storage unit, where the storage unit stores a code book, where the code book includes a precoding matrix element having a 0 element corresponding to the antenna. a precoding matrix; a precoding matrix index receiving unit, receiving a precoding matrix index from the mobile terminal; an element determining unit, searching for a precoding matrix corresponding to the precoding matrix index from the codebook, determining the Whether there is a 0 element corresponding to the antenna in the precoding matrix; and an antenna or a remote radio head off judging unit, according to the judgment result of the 0 element judging unit, determining whether there is an antenna or a remote radio that should be turned off for the user equipment head.
- a remote radio head selection method for a user equipment comprising: utilizing a codebook stored in a storage unit and including a precoding matrix having 0 elements corresponding to an antenna, Select the precoding matrix that should be used; and a reporting unit that reports the index of the selected precoding matrix.
- an RRH selection method for use in a base station, the method comprising: receiving a precoding matrix index from a mobile terminal; from a precoding matrix including a 0 element corresponding to an antenna Finding, in the codebook, a precoding matrix corresponding to the precoding matrix index, determining whether the precoding matrix has a 0 element corresponding to the antenna; and determining, according to the precoding matrix, whether there is a 0 element corresponding to the antenna As a result of the determination, it is determined whether there is an antenna or a remote radio head that should be turned off for the user equipment.
- a precoding matrix having 0 elements corresponding to a predetermined antenna.
- a codebook for wireless communication including a precoding matrix having 0 elements corresponding to a predetermined antenna.
- a logic element readable program which, when executed by a logic component, enables the logic component to implement the method of the present invention, or to cause the logic component to function as
- the precoding matrix selecting unit or reporting unit of the present invention either causes the logical component to function as the 0 element judging unit of the present invention or the antenna or remote radio head close judging unit.
- a logical component readable tangible storage medium is provided, the storage medium storing the above logic component readable program.
- the RRH can be selected to improve the performance of the system.
- Fig. 1 is a diagram showing the distribution of a base station and an RRH in a communication system.
- FIG. 2 is a mobile phone showing an example of use as a user equipment according to an embodiment of the present invention.
- Fig. 3 schematically shows a block diagram of a user equipment in accordance with a first embodiment of the present invention.
- 4 is a flow chart schematically showing a method of determining whether an antenna should be turned off.
- Fig. 5 shows a schematic functional block diagram of a user equipment of a third embodiment of the present invention.
- Figure 6 shows a schematic functional block diagram of a base station in accordance with an embodiment of the present invention.
- FIG. 7 illustrates a remote radio head selection method in accordance with an embodiment of the present invention.
- FIG. 8 illustrates a remote radio head selection method in accordance with another embodiment of the present invention.
- FIG. 9 illustrates a remote radio head selection method in accordance with another embodiment of the present invention.
- FIG. 10 illustrates a remote radio head selection method in accordance with yet another embodiment of the present invention. detailed description
- the mobile telephone 10 can be a flip type telephone having a flip cover 15 that is movable between an open position and a closed position. In Figure 2, the flip cover 15 is shown in an open position. It should be understood that the mobile telephone 10 can be of other construction, such as a "longboard phone" or "slide phone".
- Mobile phone 10 can include display 14.
- the display 14 displays information such as an operation status, time, telephone number, phone book information, various menus, and the like to the user so that the user can utilize various features of the mobile phone 10.
- Display 14 can also be used to visually display content that is received by mobile phone 10 and/or retrieved from a memory (not shown) of mobile phone 10.
- Display 14 can be used to present images, videos, and other to the user Graphics, such as photos, mobile TV content, and video related to games.
- keyboard 18 provides a variety of user input operations.
- keyboard 18 may include alphanumeric keys that allow alphanumeric information (such as phone numbers, phone lists, phone book information, notepads, text, etc.) to be entered.
- keyboard 18 may include specific function keys 17, such as a "Call Send” button for activating or answering a call, and a "Call End” button for ending or “hanging up” the call.
- the specific function keys can also include menu navigation keys and selection keys that are conveniently navigated through menus displayed on display 14.
- a pointing device and/or navigation keys can be provided to receive directional inputs from the user.
- the display 14 and the keyboard 18 can be used in combination with each other to implement the functions of the soft keys.
- the mobile phone 10 also includes components such as an antenna, a microcontroller, a speaker 50, and a microphone 52 to perform its functions.
- Fig. 3 schematically shows a block diagram of a user equipment in accordance with a first embodiment of the present invention.
- the user equipment according to the first embodiment of the present invention includes: a signal strength acquisition unit 301, an antenna close determination unit 302, a PMI selection unit 303, a report unit 304, and a storage unit 305.
- the signal strength acquisition unit 301 obtains the strength of the signal from the antenna indicated by the base station by measuring or acquiring from other units of the user equipment.
- the user equipment of the present invention determines the antenna to be measured according to the indication of the base station. For example, UE1 on the right side in Fig. 1 measures signals transmitted by antennas of two RRHs, and UE2 on the left side measures signals from antennas of two RRHs and signals from antennas of base stations.
- the strength of the signal can be, for example, the power of the signal or the amplitude of the signal, and the like.
- the antenna off judging unit 302 judges whether or not an antenna should be turned off.
- the following is an example of measuring the signal strength of four RRH antennas on the right side of UE1 in Figure 1, but it is obviously applicable to the case of measuring more or fewer antennas and more RRHs.
- Fig. 4 is a flow chart schematically showing a method of judging whether or not the antenna should be turned off.
- step S401 the signal strength acquiring unit 301 acquires the signal strength of a certain antenna (the antenna of interest) by means of measurement or the like. Then, in step S402, it is determined whether the signal strength is less than a predetermined threshold. If the signal strength is less than a predetermined threshold (step S402, YES), proceed to step S403, determining that the antenna should be turned off for the user equipment (for convenience of description, The antenna will be turned off for the user device Referred to as the antenna is turned off, and the processing ends. If the signal strength is greater than the predetermined threshold (step S402, NO), then step S404 is entered to obtain the signal strength of the signal of the antenna (referred to as the comparison antenna) that is not compared with the antenna.
- step S405 it is determined whether the difference or ratio of the signal strength of the comparison antenna to the signal strength of the antenna of interest is greater than a predetermined threshold. If the difference or ratio is greater than the predetermined threshold (step S405, YES), it indicates that the signal strength of the antenna of interest is relatively small, and the process proceeds to step S403, it is determined that the antenna should be turned off, and the processing is ended. On the other hand, if the difference or ratio is not greater than the predetermined threshold (step S405, NO), then step S406 is entered to determine if there are any comparison antennas that have not yet been compared.
- step S404 the process returns to step S404, and the signal strength of the antenna (referred to as a comparison antenna) that is not compared with the antenna is acquired, and the processing after the step is performed. If there is no comparison antenna that has not been compared (S406, NO), the process proceeds to step S407, where it is determined that the antenna should not be turned off for the user equipment, and the processing is ended.
- steps S404 and S401 in Fig. 4 can be implemented in one step. It should be understood that the description of FIG. 4 is merely illustrative and is not intended to limit the scope of the invention.
- the antenna close determination unit may stop processing when it is determined that there is a predetermined number (e.g., only one) of antennas that need to be turned off. In other embodiments, all antennas can be judged.
- the PMI selecting unit 303 selects an index (PMI) of the precoding matrix capable of indicating the antenna to be turned off based on the judgment result of the antenna close determining unit.
- the reporting unit 304 reports the selected PMI to the base station.
- the antennas of the first RRT are T1 and T2
- the antennas of the second RRT are ⁇ 3 and ⁇ 4
- the precoding matrix ( ⁇ ) corresponding to the antenna T1 The element is P1
- the element of the precoding matrix ( ⁇ ) corresponding to the antenna ⁇ 2 is ⁇ 2
- the element of the precoding matrix ( ⁇ ) corresponding to the antenna ⁇ 3 is ⁇ 3
- the selected precoding matrix ⁇ has such a form:
- the precoding moment having such a form can be selected.
- the antenna that should be turned off is indicated by setting the precoding matrix element corresponding to the antenna that should be turned off to zero.
- a precoding matrix is provided, the precoding matrix having a 0 element corresponding to a predetermined antenna. Further, the present invention relates to a codebook including a precoding matrix including 0 elements corresponding to a predetermined antenna.
- the codebook of the present invention should be understood in a broad sense.
- the codebook includes only a level one precoding matrix (which is itself a precoding matrix that can be used).
- the codebook includes two or more matrix sets (each matrix set is called a level), and matrix multiplication in different matrix sets (also referred to as matrix multiplication by stages) to obtain precoding matrix.
- the numbering of the matrices in the set of levels of the matrices that obtain the precoding matrix constitutes the index ( ⁇ ) of the precoding matrix.
- the codebook When a precoding matrix having a 0 element corresponding to an antenna is included in a precoding matrix obtained by multiplying the matrix of each level, the codebook is said to include a precoding matrix having 0 elements corresponding to the antenna.
- the above two forms of codebooks may be codebooks including a precoding matrix having 0 elements corresponding to the antenna. And the above two forms of codebooks are available.
- the codebook includes two or more levels of matrices
- the first order matrix may be an existing constant modulus codebook matrix (ie, each element in the matrix is a complex number with a modulus of one)
- the transformation matrix can be a left multiplication matrix or a right multiplication matrix, which can be a point multiplication or a Kronecker product.
- the codebook contains a two-level matrix, taking the left multiplication as an example, the matrix set W1 is the first level, and the matrix set W2 is the second level.
- the one that satisfies the formula (1) can be a non-constant code book, for example
- an indication of antenna selection or RRH selection may be used.
- the base station can know the antenna/RRH selection result of the user by obtaining wl.
- the code book may be divided into two parts: a first code book and a second code book, and the first code book only includes such a pre An encoding matrix that does not contain a 0 element corresponding to the antenna.
- the second codebook only includes such precoding matrices that the precoding matrix contains the 0 elements corresponding to the antenna.
- the code book (including the first code book and the second code book) is stored in the storage unit 305. The same codebook should be stored in the base station and in the user equipment.
- the second codebook can be divided into a 4-antenna second codebook for 4 antennas, a 6-antenna second codebook for 6 antennas, and the like.
- the PMI selection unit 303 selects only the precoding matrix from the second codebook.
- the reporting unit 304 transmits the index of the precoding matrix selected by the PMI selecting unit 303.
- the precoding matrix elements of the antennas for the same RRH in the same precoding matrix can only be all 0s or all It is not 0, so a precoding matrix like [Pl, 0, P3, 0] does not appear.
- an RRH off determination unit may be added, and the unit determines the RRH. For example, it is determined that the RRH is turned off only when all antennas of the RRH should be turned off. Or when a predetermined proportion of the antennas in the RRH antenna should be turned off, it can be determined that the RRH should be turned off.
- the PMI selecting unit 303 selects the precoding matrix from the second codebook only when the RRH off judging unit 302 judges that there is an RRH that should be turned off.
- the signal strength measurement is performed by the user equipment, and the determination of whether there is an antenna that needs to be turned off is specifically performed.
- the codebook may not be classified, but in the process of selecting the PMI, all precoding matrices are used for selection.
- the processing load of the user equipment can be alleviated, the change to the user equipment is minimized, and because of the codebook There is a precoding matrix containing 0 elements corresponding to the antenna, so that the purpose of selecting the RRH can still be achieved.
- Fig. 5 shows a schematic functional block diagram of a user equipment according to a fourth embodiment of the present invention.
- the user equipment according to the fourth embodiment of the present invention is different from the user equipment shown in FIG. 3 in that the signal strength acquiring unit 301 and the antenna close determining unit 302 are omitted, and the PMI selection shown in FIG. 3 is omitted.
- the unit 303 is different, and the PMI selection unit 303 of the user equipment according to the fourth embodiment of the present invention directly performs PMI selection based on the performance index and the PMI selection channel parameter.
- the channel parameters e.g., channel response
- these PMI selections are based on PMI selection are always measured, but the measurement of these parameters is not closely related to the present invention and will not be described in detail herein.
- the PMI is selected from a codebook having a precoding matrix containing 0 elements corresponding to the antenna, so that when there is an antenna that needs to be turned off, the corresponding 0 is also selected.
- the precoding matrix of the elements which still serves the purpose of selecting the RRH.
- the precoding matrix elements of the antennas for the same RRH are both 0 or both non-zero.
- Figure 6 shows a schematic functional block diagram of a base station in accordance with an embodiment of the present invention.
- the base station includes a PMI receiving unit 601, an element determining unit 602, an antenna/RRH closing determining unit 603, and a storage unit 604.
- the storage unit 604 stores the same codebook as the codebook stored in the user equipment.
- the precoding matrix elements of the antennas for the same RRH are both 0 or both non-zero.
- the codebook stored in the base station it is not necessary to classify the precoding matrix in the codebook, that is, it is not necessary to divide into the first codebook and the second codebook. Of course, it is also possible to divide into the first code book and the second code book when needed.
- the PMI receiving unit 601 receives (directly receives or receives through the RRH) the PMI from the user equipment. 0 element judgment
- the unit 602 searches for a corresponding precoding matrix in the codebook stored in the storage unit 604 according to the received PMI, and determines whether the searched precoding matrix contains a 0 element corresponding to the antenna, and the antenna/RRH off determining unit 603 further determines whether it is needed.
- the corresponding antenna or RRH is turned off for the user equipment that sends the PMI. That is to say, the PMI transmitted by the user terminal is considered to decide whether to close the corresponding antenna or RRH for the user equipment that sends the PMI.
- the corresponding antenna or RRH is turned off for the user equipment.
- other factors are also considered to determine whether to turn off the corresponding antenna for the user equipment, but it needs to consider whether the precoding matrix contains the 0 element corresponding to the antenna.
- FIG. 7 illustrates a remote radio head selection method in accordance with an embodiment of the present invention.
- a remote radio head selection method according to an embodiment of the present invention, first, in step S701, a pre-stored codebook is used, according to performance indicators (for example, maximizing throughput or minimizing bit error rate). And the channel parameters determine the precoding matrix used.
- the codebook used has a precoding matrix containing 0 elements corresponding to the antenna.
- the precoding matrices for the antennas of the same RRH are both 0 or both non-zero.
- an index (PMI) indicating the selected precoding matrix is transmitted.
- FIG. 8 illustrates a remote radio head selection method in accordance with another embodiment of the present invention.
- the signal strength of the signal from the predetermined antenna is obtained by measurement or the like at step S801.
- step S802 it is determined whether there is an antenna that should be turned off.
- step S803 a precoding matrix is selected from a precoding matrix including only precoding matrix elements having 0 elements corresponding to the antenna, and
- step S804 the index of the precoding matrix selected in step S803 is transmitted.
- FIG. 9 illustrates a remote radio head selection method in accordance with another embodiment of the present invention.
- the signal strength of the antenna is obtained by a method such as measurement in step S901.
- step S902 it is determined whether there is an antenna that should be turned off, and in step S903, it is determined according to the judgment result of step S902. Is there an RRH that should be closed?
- step S904 a precoding matrix is selected from a precoding matrix including only precoding matrix elements having 0 elements corresponding to the antenna, and in step S905 The index of the precoding matrix selected in step S904 is sent.
- the precoding matrices of the antennas for the same RRH are both 0 or both are non-zero.
- the method shown in Figures 8 and 9 can be considered as an embodiment of the method shown in Figure 7.
- the methods shown in Figures 7-9 are all used at the user equipment UE.
- FIG. 10 illustrates a remote radio head selection method in accordance with yet another embodiment of the present invention.
- the PMI from the user equipment is received in step S1001.
- step S1002 according to the PMI, searching for a corresponding precoding matrix from the codebook, it should be noted that the codebook includes a precoding matrix of precoding matrix elements having 0 elements corresponding to the antenna and A precoding matrix of precoding matrix elements having 0 elements corresponding to the antenna.
- step S1004 it is determined whether an antenna or RRH should be turned off for the user equipment.
- off antenna or RRH for the user equipment as used in the present invention means that the antenna or RRH does not transmit information with respect to a certain user equipment, and generally does not mean that it is physically turned off, for example, by powering off or the like or by turning off the switch.
- the description of the methods and the steps may be used to facilitate the understanding of the device and the unit, and the description of the device and the unit may be used to help the understanding of the method and the steps.
- the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
- the present invention relates to a logic component readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various components described above Method or step.
- Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
- the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, a optical disk, a DVD, f lash, magneto-optical disks, memory cards, memory sticks, etc.
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- Mathematical Physics (AREA)
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- Radio Transmission System (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11865055.5A EP2706671A4 (en) | 2011-05-06 | 2011-05-06 | PARTICIPANT AND BASE STATION AND METHOD FOR SELECTION OF REMOTE RADIO HEADS |
CN2011800621374A CN103270705A (zh) | 2011-05-06 | 2011-05-06 | 用户设备、基站、远端无线头选择方法 |
JP2014509581A JP5783325B2 (ja) | 2011-05-06 | 2011-05-06 | ユーザー設備、基地局、リモート無線ヘッドの選択方法 |
KR1020137032312A KR20140016971A (ko) | 2011-05-06 | 2011-05-06 | 사용자 장비, 기지국 및 원격 무선 헤드 선택 방법 |
PCT/CN2011/073778 WO2012151737A1 (zh) | 2011-05-06 | 2011-05-06 | 用户设备、基站、远端无线头选择方法 |
US14/071,174 US9246565B2 (en) | 2011-05-06 | 2013-11-04 | User equipment, base station and method for selecting remote radio head |
Applications Claiming Priority (1)
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PCT/CN2011/073778 WO2012151737A1 (zh) | 2011-05-06 | 2011-05-06 | 用户设备、基站、远端无线头选择方法 |
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US14/071,174 Continuation US9246565B2 (en) | 2011-05-06 | 2013-11-04 | User equipment, base station and method for selecting remote radio head |
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WO2012151737A1 true WO2012151737A1 (zh) | 2012-11-15 |
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US (1) | US9246565B2 (zh) |
EP (1) | EP2706671A4 (zh) |
JP (1) | JP5783325B2 (zh) |
KR (1) | KR20140016971A (zh) |
CN (1) | CN103270705A (zh) |
WO (1) | WO2012151737A1 (zh) |
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JP2015119266A (ja) * | 2013-12-17 | 2015-06-25 | 船井電機株式会社 | ユーザーインターフェース装置、ユーザーインターフェースシステム、及び印刷装置 |
US9843255B1 (en) | 2014-12-08 | 2017-12-12 | Nxp Usa, Inc. | Charge pump apparatus, phase-locked loop, and method of operating a charge pump apparatus |
WO2017058607A1 (en) * | 2015-09-30 | 2017-04-06 | Commscope Technologies Llc | Power cabling connections for remote radio heads and related methods |
EP3255796B1 (en) | 2016-06-08 | 2020-01-08 | NXP USA, Inc. | Method and apparatus for generating a charge pump control signal |
US10243631B2 (en) | 2016-06-08 | 2019-03-26 | Nxp Usa, Inc. | Method and apparatus for performing distributed computation of precoding estimates |
EP3312990B1 (en) | 2016-10-24 | 2019-12-11 | NXP USA, Inc. | Amplifier devices with input line termination circuits |
KR102410283B1 (ko) * | 2016-12-05 | 2022-06-17 | 한국전자통신연구원 | 복수의 ru를 이용한 신호 송신 방법 및 장치 |
US10454543B2 (en) * | 2016-12-05 | 2019-10-22 | Electronics And Telecommunications Research Institute | Method and apparatus for transmitting signal using multiple radio units |
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CN101582712A (zh) * | 2009-06-19 | 2009-11-18 | 中兴通讯股份有限公司 | 一种实现预编码的方法及预编码矩阵的生成方法 |
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WO2011161601A1 (en) * | 2010-06-23 | 2011-12-29 | Koninklijke Philips Electronics N.V. | A method for operating a secondary station |
KR20230145222A (ko) * | 2011-01-07 | 2023-10-17 | 인터디지탈 패튼 홀딩스, 인크 | 다중 송신 포인트의 채널 상태 정보(csi) 전달 |
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US8792896B2 (en) * | 2012-10-09 | 2014-07-29 | Telefonaktiebolaget L M Ericsson (Publ) | Beamforming for increasing cell edge capacity in a heterogeneous network |
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- 2011-05-06 CN CN2011800621374A patent/CN103270705A/zh active Pending
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- 2011-05-06 KR KR1020137032312A patent/KR20140016971A/ko not_active Application Discontinuation
- 2011-05-06 WO PCT/CN2011/073778 patent/WO2012151737A1/zh active Application Filing
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CN101399722A (zh) * | 2007-09-25 | 2009-04-01 | 海尔集团公司 | 无线网络设备接入方法及系统 |
CN101582712A (zh) * | 2009-06-19 | 2009-11-18 | 中兴通讯股份有限公司 | 一种实现预编码的方法及预编码矩阵的生成方法 |
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EP2706671A4 (en) | 2014-10-22 |
EP2706671A1 (en) | 2014-03-12 |
KR20140016971A (ko) | 2014-02-10 |
US20140064394A1 (en) | 2014-03-06 |
CN103270705A (zh) | 2013-08-28 |
JP5783325B2 (ja) | 2015-09-24 |
JP2014514881A (ja) | 2014-06-19 |
US9246565B2 (en) | 2016-01-26 |
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