WO2018127084A1 - 波束选择方法、移动台和基站 - Google Patents

波束选择方法、移动台和基站 Download PDF

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Publication number
WO2018127084A1
WO2018127084A1 PCT/CN2018/071318 CN2018071318W WO2018127084A1 WO 2018127084 A1 WO2018127084 A1 WO 2018127084A1 CN 2018071318 W CN2018071318 W CN 2018071318W WO 2018127084 A1 WO2018127084 A1 WO 2018127084A1
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Prior art keywords
dominant
combined
beams
mobile station
base station
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PCT/CN2018/071318
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English (en)
French (fr)
Inventor
李慧玲
那崇宁
蒋惠玲
柿岛佑一
永田聪
Original Assignee
株式会社Ntt都科摩
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社Ntt都科摩 filed Critical 株式会社Ntt都科摩
Priority to CN201880005534.XA priority Critical patent/CN110121843A/zh
Priority to US16/473,997 priority patent/US20200195333A1/en
Publication of WO2018127084A1 publication Critical patent/WO2018127084A1/zh

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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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using 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
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using 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
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • 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
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present application relates to the field of communication technologies, and in particular to a beam selection method, a mobile station, and a base station.
  • base stations use a one-dimensional antenna to communicate with mobile stations.
  • a three-dimensional beamforming technique has been proposed.
  • the base station uses a two-dimensional antenna array to communicate with the mobile station.
  • the two-dimensional antenna array has a vertical dimension in addition to deploying the antenna in the horizontal dimension and performing horizontal beam steering ( The antenna is deployed on the height direction and beam-controlled to achieve three-dimensional beamforming.
  • channel estimation is required before the base station transmits downlink data to the mobile station.
  • the base station transmits a channel state information reference signal (CSI-RS) to the mobile station, and the mobile station performs channel estimation through the CSI-RS, and returns a rank indicator (RI), a precoding matrix index (PMI), and a channel quality indicator ( Information such as CQI), and then the base station precodes the data based on the information fed back by the mobile station.
  • CSI-RS channel state information reference signal
  • RI rank indicator
  • PMI precoding matrix index
  • Information such as CQI
  • a beam selection method is provided, the method being performed by a mobile station, comprising: selecting a dominant beam from a plurality of beams; selecting from a plurality of beams according to the selected dominant beam a combined beam, the dominant beam and the combined beam are both located in a beam group, the beams in the beam group are orthogonal to each other and adjacent; a corresponding reference beam is determined according to the beam group, wherein the reference A beam is used to indicate the range of the beam set and is different from the dominant beam.
  • a beam selection method is provided, the method being performed by a mobile station, comprising: selecting a dominant beam from a plurality of beams; and selecting from the plurality of beams according to the selected dominant beam A combined beam is selected, the dominant beam and the combined beam being located in one beam group, the beams in the beam group being orthogonal to each other and not adjacent.
  • a beam selection method is provided, the method being performed by a base station, comprising: selecting one dominant beam from a plurality of beams; selecting from a plurality of beams according to the selected dominant beam a combined beam, the dominant beam and the combined beam are both located in a beam group, the beams in the beam group are orthogonal to each other and adjacent; a corresponding reference beam is determined according to the beam group, wherein the reference A beam is used to indicate a range of the beam set and is different from the dominant beam; information is transmitted to the mobile station using the selected combination of the dominant beam and the combined beam.
  • a beam selection method is provided, the method being performed by a base station, comprising: selecting one dominant beam from a plurality of beams; selecting from a plurality of beams according to the selected dominant beam a combined beam, the dominant beam and the combined beam are both located in one beam group, the beams in the beam group are orthogonal to each other and not adjacent; utilizing the selected combination of the dominant beam and the combined beam Send a message to the mobile station.
  • a mobile station comprising: a first dominant beam selecting unit configured to select one dominant beam from a plurality of beams; and a first combined beam selecting unit configured to be selected according to the selected a dominant beam, selecting a combined beam from a plurality of beams, the dominant beam and the combined beam being located in one beam group, the beams in the beam group being orthogonal and adjacent to each other; a first reference beam determining unit And configuring, according to the beam group, a corresponding reference beam, wherein the reference beam is used to indicate a range of the beam group, and is different from the dominant beam.
  • a base station comprising: a second dominant beam selecting unit configured to select one dominant beam from a plurality of beams; and a second combined beam selecting unit configured to be configured according to the selected a dominant beam, selecting one combined beam from the plurality of beams, the dominant beam and the combined beam are both located in one beam group, the beams in the beam group are orthogonal and adjacent to each other; and the second reference beam determining unit, Configuring to determine a corresponding reference beam according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the dominant beam; and the first sending unit is configured to utilize the selected The combination of the dominant beam and the combined beam transmits information to the mobile station.
  • a mobile station comprising: a third dominant beam selecting unit configured to select one dominant beam from a plurality of beams; and a third combined beam selecting unit configured to be selected according to the selected The dominant beam is selected from a plurality of beams, the dominant beam and the combined beam being located in one beam group, the beams in the beam group being orthogonal to each other and not adjacent.
  • a base station comprising: a fourth dominant beam selecting unit configured to select one dominant beam from a plurality of beams; and a fourth combined beam selecting unit configured to be configured according to the selected a dominant beam, selecting one combined beam from the plurality of beams, wherein the dominant beam and the combined beam are both located in one beam group, the beams in the beam group are orthogonal to each other and not adjacent; the second transmitting unit is configured Information is transmitted to the mobile station using the selected combination of the dominant beam and the combined beam.
  • the beam selection range can be expanded, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG. 1 shows a schematic diagram of a design of a codebook, wherein FIG. 1(a) and FIG. 1(b) respectively show two beam selection schemes;
  • FIG. 2 is a schematic diagram showing a codebook determined by a base station based on a DFT matrix
  • FIG. 3 is a schematic diagram showing orthogonal beam combination of a dominant beam of the codebook of FIG. 2;
  • FIG. 4 is a schematic diagram showing a selection scheme of a 32-port combined beam
  • FIG. 5 is a schematic diagram showing coverage of a beam group in 8-port and 16-port;
  • FIG. 6 is a flow chart showing a beam selection method according to a first embodiment of the present invention.
  • FIG. 7 is a view showing an example of beam selection in the case of a multi-port antenna according to the first embodiment of the present invention.
  • Figure 8 is a block diagram showing the structure of a mobile station according to a first embodiment of the present invention.
  • FIG. 9 is a flowchart showing a beam selection method according to a second embodiment of the present invention.
  • FIG. 10 is a block diagram showing the structure of a base station according to a second embodiment of the present invention.
  • Figure 11 is a flow chart showing a beam selection method according to a third embodiment of the present invention.
  • Figure 12 is a diagram showing the combined beam search range of the third embodiment of the present invention, wherein Figure 12(a) shows the search range laterally spaced from the dominant beam, and Figure 12(b) shows the search range longitudinally spaced from the dominant beam, Figure 12 (c), (d) indicate a search range that is diagonally connected to the dominant beam and intersected;
  • FIG. 13 is a diagram showing an example of beam selection in which a beam selection method according to a third embodiment of the present invention is diagonally connected and cross-interval in the case of a multi-port antenna;
  • FIG. 14 is a diagram showing an example of beam selection of a laterally spaced or longitudinally spaced beam-selecting method in the case of a multi-port antenna according to a third embodiment of the present invention.
  • Figure 15 is a block diagram showing the structure of a mobile station according to a third embodiment of the present invention.
  • FIG. 16 is a flowchart showing a beam selection method according to a fourth embodiment of the present invention.
  • Figure 17 is a block diagram showing the structure of a base station according to a fourth embodiment of the present invention.
  • FIG. 18 is a schematic diagram showing beam group selection according to an embodiment of the present invention.
  • Figure 19 is a diagram showing beam group selection in accordance with another embodiment of the present invention.
  • PMI enhancement is one of the topics discussed.
  • the linear combination of beams is one of the alternatives.
  • the beam combination quantizes and combines multiple beams compared to the beam selection of Release 13.
  • the linear combination of Beam improves the accuracy of channel quantization and improves the accuracy of feedback, thereby improving system performance.
  • the codebook is composed of two orthogonal beams, which are located in a beam group.
  • the design of the existing scheme limits the composition of the beam group and the selection of the combined beam to reduce the overhead of feedback.
  • the number of beams in the orthogonal beam group is no more than eight, and the shape of the beam group is regular: 4*2 or 8*1.
  • FIG. 1 shows a design of a codebook, wherein FIG. 1(a) shows a beam selection scheme in which a group of beams is first selected among a plurality of beams, and then one of the beams b6 is selected, and FIG. 1 (FIG. 1) b) indicates a beam selection scheme that selects a leading beam b5 and combines a combined beam b7 to form a beam combination.
  • the beam selection schemes of Figures 1(a) and 1(b) can be applied in a wireless communication system, which can include at least one base station and at least one mobile station.
  • the base station can be connected to the upper layer device and then to the core network.
  • the base station can be equipped with a two-dimensional antenna array and communicate with the mobile station through the antenna array.
  • the base station can design a codebook based on the DFT matrix.
  • FIG. 2 shows a schematic diagram of a codebook determined by a base station based on a DFT matrix.
  • FIG 2 parameters N 1, N 2 are the number of antenna ports of a first dimension and a second dimension, O 1, O 2, respectively a first and second dimension of the oversampling ratio.
  • the base station can then share the determined codebook to the mobile station such that the base station and the mobile station share a known set of codebooks and perform subsequent information transmission based on the set of codebooks.
  • the base station may perform downlink data transmission based on the beam feedback.
  • the mobile station may first select a dominant beam (the gray beam in the lower left corner of FIG. 2) according to the channel condition and based on the shared known codebook. Subsequently, all orthogonal beams (beams covered by shaded portions in Fig. 2) orthogonal thereto can be acquired based on the determined dominant beam and simplified to the orthogonal beam combination shown in Fig. 3.
  • a framed beam set for selecting a combined beam combined with the dominant beam, in which the dominant beam is located in the lower left corner of the block.
  • the number of beams included in the beam group is eight.
  • the number of beams referred to herein may be determined by the base station and notified to the mobile station, or may be suggested by the mobile station to the base station, or may be the default number of base stations and mobile stations based on certain principles.
  • the number of the above-mentioned beams is only an example. In practical applications, the number of beams that can be included in the beam group may be more or less, which is not limited herein.
  • FIG. 4 shows a schematic diagram of a selection scheme for a combined beam of 32 ports ((N 1 , N 2 ) takes a value of ((4, 4)).
  • the currently defined dominant beam is located in the lower left corner and contains 8 In the beam group of the beam, only the optional combined beam and the dominant beam combination in the upper right corner can be selected, but in fact, the best beam group not included in the beam group at the lower right of the dominant beam can optimize the channel condition.
  • the combined beam in the current scheme, due to the limitation of the beam group, this optimal combined beam cannot be considered and selected.
  • Figure 5 shows the difference in coverage of beam groups in 8-port and 16-port. It can be seen that in the case of 16-port, the coverage of the optional combined beam is doubled compared to the 8-port antenna, and when the antenna is This problem will be more serious when the number of ports is larger.
  • FIG. 6 shows a flow diagram of a beam selection method 600, which may be performed by a mobile station, in accordance with an embodiment of the present invention.
  • the mobile station selects one dominant beam from among a plurality of beams.
  • the mobile station may select one dominant beam from the plurality of beams according to conditions associated with channel quality, data throughput, or transmission power of the channel corresponding to each beam.
  • the mobile station may perform channel estimation for each beam to determine the channel quality of the channel corresponding to each beam, which may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • the mobile station can also determine a corresponding rank indicator (RI), precoding matrix index (PMI), etc. for each beam.
  • a combined beam is selected from a plurality of beams according to the selected dominant beam, and the dominant beam and the combined beam are both located in one beam group, and beams in the beam group are orthogonal to each other. And adjacent.
  • the selection of the combined beam will not be limited by the previously mentioned limits that must be located in the upper right of the dominant beam in a limited number (eg, 8) of the beam sets, but can be searched and selected and dominated around the dominant beam.
  • the orthogonal beam with the best channel quality after beam combining is used as the combined beam.
  • the method of determining the combined beam is similar to the method for determining the dominant beam described above, and the combined beam can also be selected by the associated conditions of the channel quality, the data throughput, or the transmission power of the combined beam and the combined beam.
  • the pilot beam and the combined beam may be used to determine a beam group including a preset number (eg, 8) of beams.
  • the number of beams of the beam group may be any number.
  • the beam group may include 2 n or 2 n +1 beams, and the number of different antenna ports may be set to have Beam groups of the same number of beams to make the feedback load the same, simplifying system setup.
  • a corresponding reference beam is determined according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the dominant beam.
  • the position of the reference beam at the beam set can be preset and can be located at any determined predetermined position of the beam set.
  • the reference beam may be located as close as possible to the dominant beam, and preferably, the reference beam may be located in the lower left corner of the beam set.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be different from the dominant beam.
  • the reference beam may also be undefined, and the mobile station may directly select the combined beam and the combined beam combined there according to the foregoing steps S601-S602 to complete the beam selection method.
  • the mobile station may feed back information indicating the reference beam to the base station, and indicate the selected dominant beam and the location to the base station based on the information.
  • the position of the combined beam relative to the reference beam may select any suitable manner to feed back information of the reference beam according to needs, for example, the mobile station may feed back an index of the reference beam, and by feeding back the dominant beam and the The position of the combined beam relative to the reference beam is such that the base station determines the dominant beam and the combined beam.
  • the feedback mode of the mobile station may be configured by the base station. For example, the mobile station may feed back the reference beam index periodically or non-periodically.
  • the mobile station may feed back the information at a longer time interval and/or for a wide frequency band.
  • Reference beam index The mobile station can feed back the reference beam index at the same timing or frequency as the RI.
  • the mobile station may feed back the index of the reference beam with at least one of RI, PMI and CQI; in case the mobile station is configured for periodic feedback, reference The feedback period of the beam index may be the same as or different from the feedback period of the RI, PMI, and/or CQI.
  • the mobile station can directly feed back information indicating the dominant beam and the combined beam to the base station.
  • the mobile station may separately feed back the dominant beam index and the combined beam index to the base station, and may also feed back the dominant beam index to the base station, and feed back the combined beam by using the combined beam relative to the position of the dominant beam.
  • Information The feedback mode of the primary beam index is similar to that of the reference beam index, and is not described here.
  • the values of L 1 and L 2 are as described above.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data transmitted to the mobile station. The base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the beam selection range can be expanded, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG. 7 is a diagram showing an example of beam selection in the case of a multi-port antenna according to a beam selection method according to an embodiment of the present invention, which is 20 ports ((N 1 , N 2 ) is ((5, 2)), 28 ports) ((N 1 , N 2 ) takes (( 7 , 2 )), 24 ports (1) ((N 1 , N 2 ) takes ((6, 2)) and 24 (2) (( The value of N 1 , N 2 ) is ((3, 4)).
  • the number of beams of the beam set is eight, but in other embodiments of the present invention, the beam of the beam set The number is not necessarily limited to eight.
  • the UE can perform the beam selection method described above. Since the operation of the UE is substantially the same as the steps of the beam selection method described above, only a brief description thereof will be made herein, and a repeated description of the same content will be omitted.
  • the UE 800 includes a first dominant beam selection unit 810, a first combined beam selection unit 820, and a first reference beam determination unit 830. It is to be appreciated that FIG. 8 only shows components related to embodiments of the present disclosure, while other components are omitted, but this is merely illustrative, and the UE 800 may include other components as needed.
  • the first dominant beam selection unit 810 selects one dominant beam from the plurality of beams. As described above, the first dominant beam selecting unit 810 can select one dominant beam from the plurality of beams according to conditions associated with channel quality, data throughput, or transmission power of the channel corresponding to each beam. Specifically, the first dominant beam selection unit 810 may perform channel estimation for each beam to determine channel quality of a channel corresponding to each beam, which may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • the first combined beam selecting unit 820 may select one combined beam from the plurality of beams according to the selected dominant beam, where the dominant beam and the combined beam are both located in one beam group, and the beam in the beam group They are orthogonal to each other and adjacent.
  • the selection of the combined beam by the first combined beam selection unit 820 will not be limited by the previously mentioned restrictions that must be located in the upper right of the dominant beam in a defined number (eg, 8) of beam sets, but may be searched and selected around the dominant beam.
  • the orthogonal beam with the best channel quality after combining with the dominant beam is used as the combined beam.
  • the method of determining the combined beam is similar to the method for determining the dominant beam described above, and the combined beam can also be selected by the associated conditions of the channel quality, the data throughput, or the transmission power of the combined beam and the combined beam.
  • the first reference beam determining unit 830 may determine a corresponding reference beam according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the dominant beam.
  • the first reference beam determining unit 830 may determine the beam group including the preset number (eg, 8) beams by using the dominant beam and the combined beam. And determining its reference beam based on this beam set.
  • the position of the reference beam at the beam set can be preset and can be located anywhere in the beam set.
  • the reference beam may be located as close as possible to the dominant beam, and preferably, the reference beam may be located in the lower left corner of the beam set.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be different from the dominant beam.
  • the reference beam may also be undefined, and the first dominant beam selecting unit 810 and the first combined beam selecting unit 820 may directly select the dominant beam and the combined beam combined therewith.
  • the information indicating the reference beam may be fed back to the base station, and the selected location is indicated to the base station based on the information.
  • the position of the dominant beam and the combined beam relative to the reference beam may be selected to feed back information of the reference beam, for example, an index of the reference beam may be fed back, and by comparing the dominant beam and the combined beam with respect to The location of the reference beam causes the base station to determine the dominant beam and the combined beam.
  • the mobile station can directly feed back information indicating the dominant beam and the combined beam to the base station.
  • the dominant beam index and the combined beam index may be separately fed back to the base station, and the dominant beam index may be fed back to the base station, and the combined beam information is fed back by the combined beam relative to the position of the dominant beam.
  • the feedback mode of the primary beam index is similar to that of the reference beam index, and is not described here.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data transmitted to the mobile station. The base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the mobile station according to the embodiment of the present invention can expand the beam selection range, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG. 9 shows a flow diagram of a beam selection method 900, which may be performed by a base station, in accordance with an embodiment of the present invention.
  • the beam selection method 900 performed by the base station shown in FIG. 9 is similar to the beam selection method 600 performed by the mobile station shown in FIG. 6, and the same or similar expressions are not described herein again.
  • the base station selects one dominant beam from among a plurality of beams.
  • the base station may select one dominant beam from the plurality of beams according to conditions associated with the channel quality, data throughput, or transmission power of the channel corresponding to each beam fed back by the mobile station.
  • the base station may acquire a channel estimation performed by the mobile station for each beam, thereby determining a channel quality of a channel corresponding to each beam, and the channel quality may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • a combined beam is selected from a plurality of beams according to the selected dominant beam, and the dominant beam and the combined beam are both located in one beam group, and beams in the beam group are orthogonal to each other. And adjacent.
  • the base station's selection of the combined beam will not be limited by the previously mentioned limit that must be located in the upper right of the dominant beam in a limited number (eg, 8) of the beam sets, but can be searched around the dominant beam and selected and The orthogonal beam with the best channel quality after the dominant beam combination is used as the combined beam.
  • the method of determining the combined beam is similar to the method for determining the dominant beam.
  • the base station can also select the combined beam by the associated conditions of channel quality, data throughput, or transmission power, such as the combined beam and combined beam.
  • a corresponding reference beam is determined according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the dominant beam.
  • the base station may determine the beam group including the preset number (eg, 8) beams by using the dominant beam and the combined beam, and determine, based on the beam group, the beam group. Its reference beam.
  • the position of the reference beam at the beam set can be preset and can be located anywhere in the beam set. Alternatively, the reference beam may be located as close as possible to the dominant beam, and preferably, the reference beam may be located in the lower left corner of the beam set.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be different from the dominant beam.
  • the reference beam may also be undefined, and the base station may directly select the dominant beam and the combined beam combined there according to the foregoing steps S901-S902.
  • the base station may transmit information to the mobile station using the selected combination of the dominant beam and the combined beam.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data sent to the mobile station.
  • the base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the beam selection range can be expanded, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • the base station can perform the beam selection method described above. Since the operation of the base station is substantially the same as the steps of the beam selection method described above, only a brief description thereof will be made herein, and a repeated description of the same content will be omitted.
  • the base station 1000 includes a second dominant beam selecting unit 1010, a second combined beam selecting unit 1020, a second reference beam determining unit 1030, and a first transmitting unit 1040.
  • FIG. 10 only shows components related to embodiments of the present invention, while other components are omitted, but this is merely illustrative, and base station 1000 may include other components as needed.
  • the second dominant beam selection unit 1010 selects one dominant beam from the plurality of beams. As described above, the second dominant beam selecting unit 1010 may select one dominant beam from the plurality of beams according to conditions associated with the channel quality, data throughput, or transmission power of the channel corresponding to each beam fed back by the mobile station. Specifically, the second dominant beam selecting unit 1010 may acquire a channel estimation performed by the mobile station for each beam, thereby determining a channel quality of a channel corresponding to each beam, and the channel quality may be represented by, for example, a channel quality indicator (CQI) or the like. .
  • CQI channel quality indicator
  • the second combined beam selecting unit 1020 may select one combined beam from the plurality of beams according to the selected dominant beam, where the dominant beam and the combined beam are both located in one beam group, and the beam in the beam group They are orthogonal to each other and adjacent.
  • the selection of the combined beam by the second combined beam selection unit 1020 will not be limited by the previously mentioned restrictions that must be located in the upper right of the dominant beam in a defined number (eg, 8) of beam sets, but may be searched and selected around the dominant beam.
  • the orthogonal beam with the best channel quality after combining with the dominant beam is used as the combined beam.
  • the method of determining the combined beam is similar to the method for determining the dominant beam.
  • the base station can also select the combined beam by the associated conditions of channel quality, data throughput, or transmission power, such as the combined beam and combined beam.
  • the second reference beam determining unit 1030 may determine a corresponding reference beam according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the dominant beam.
  • the second reference beam determining unit 1030 may determine the beam group including the preset number (eg, 8) beams by using the dominant beam and the combined beam. And determining its reference beam based on this beam set.
  • the position of the reference beam at the beam set can be preset and can be located anywhere in the beam set.
  • the reference beam may be located as close as possible to the dominant beam, and preferably, the reference beam may be located in the lower left corner of the beam set.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be different from the dominant beam.
  • the reference beam may also be undefined, and the base station may directly select the dominant beam and the combined beam combined therewith.
  • the first transmitting unit 1040 may transmit information to the mobile station by using the selected combination of the dominant beam and the combined beam.
  • the first sending unit 1040 may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and the combined beam, and then determine a precoding vector suitable for data sent to the mobile station. Then, the first transmitting unit 1040 can precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the base station according to the embodiment of the present invention can expand the beam selection range, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG 11 shows a flow diagram of a beam selection method 1100, which may be performed by a mobile station, in accordance with an embodiment of the present invention.
  • the mobile station selects one dominant beam from among a plurality of beams.
  • the mobile station may select one dominant beam from the plurality of beams according to conditions associated with channel quality, data throughput, or transmission power of the channel corresponding to each beam.
  • the mobile station may perform channel estimation for each beam to determine the channel quality of the channel corresponding to each beam, which may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • the mobile station can also determine a corresponding rank indicator (RI), precoding matrix index (PMI), etc. for each beam.
  • a combined beam is selected from a plurality of beams according to the selected dominant beam, and the dominant beam and the combined beam are both located in one beam group, and beams in the beam group are orthogonal to each other. And not adjacent.
  • the selection of the combined beam will not be limited by the proximity of the dominant beam, nor to the previously mentioned limit of the upper right of the dominant beam in a limited number of (eg, 8) beam sets. It is possible to search for and select a quadrature beam with the best channel quality after combining with the dominant beam as a combined beam around the dominant beam. In the process of searching for combined beams, there are many ways to search.
  • the combined beam may be first searched within a range adjacent to the dominant beam, and if the search result is not ideal, the combined beam may be searched for in a range not adjacent to the dominant beam, and finally the combination is finally determined. Beam. In addition, it is also possible to search for and determine the combined beam directly within a range that is not adjacent to the dominant beam.
  • FIG. 12 respectively illustrates various situations in which the combined beam search range is determined in the case of dominant beam determination, such as laterally spaced from the dominant beam (FIG. 12(a) ), longitudinal spacing (Fig. 12(b)) or intersecting with the main beam diagonal and intersecting (Fig. 12(c), (d)).
  • the search range of the combined beam is only an example, and the mobile station can also determine the range according to the remaining arrangement manner, and the search range of the combined beam can be horizontally, longitudinally, or obliquely spaced from the dominant beam by any number of rows and columns, and not only Limited to one row and/or one column.
  • the method for determining the combined beam is similar to the method for determining the dominant beam, and the same may be selected by the associated conditions of channel quality, data throughput, or transmission power after combining the primary beam with the combined beam. Combine beams.
  • the mobile station may determine the beam group and its corresponding reference beam according to the dominant beam and the combined beam, wherein the beam group includes the dominant beam and the combined beam,
  • the reference beam is used to indicate the range of the beam set and is the same or different from the dominant beam.
  • the pilot beam and the combined beam may be used to determine a beam group including a preset number (such as 8 beams), and the beam group is determined based on the beam group.
  • Reference beam In the above example, the beam groups shown each include 8 beams, but in practical applications, the number of beams of the beam group may be any number.
  • the beam group may include 2 n or 2 n + One beam, and for different antenna port numbers, beam groups with the same number of beams can be set to make the feedback load the same, thus simplifying system setting.
  • the position of the reference beam at the beam set can be preset and can be located anywhere in the beam set.
  • the reference beam can be located as close as possible to the dominant beam.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be the same or different than the dominant beam.
  • the reference beam may also be undefined, and the mobile station may directly select the dominant beam and the combined beam combined there according to the foregoing steps S1101-S1102.
  • the mobile station may feed back information indicating the reference beam to the base station, and indicate the selected dominant beam and the location to the base station based on the information.
  • the position of the combined beam relative to the reference beam may be selected any suitable manner to feed back information of the reference beam according to needs, for example, the mobile station may feed back an index of the reference beam, and by feeding back the dominant beam and the Combining the position of the beam with respect to the reference beam to cause the base station to determine the dominant beam and the combined beam.
  • the mobile station can also feed back the dominant beam and/or the combined beam.
  • the periodic mapping in the codebook reflects the position of the dominant or combined beam.
  • the feedback mode of the mobile station may be configured by the base station. For example, the mobile station may feed back the reference beam index periodically or non-periodically. In addition, the mobile station may feed back the information at a longer time interval and/or for a wide frequency band. Reference beam index. The mobile station can feed back the reference beam index at the same timing or frequency as the RI.
  • the mobile station may feed back the index of the reference beam with at least one of RI, PMI and CQI; in case the mobile station is configured for periodic feedback, reference The feedback period of the beam index may be the same as or different from the feedback period of the RI, PMI, and/or CQI.
  • the mobile station can directly feed back information indicating the dominant beam and the combined beam to the base station.
  • the mobile station may separately feed back the dominant beam index and the combined beam index to the base station, and may also feed back the dominant beam index to the base station, and feed back the combined beam by using the combined beam relative to the position of the dominant beam.
  • Information The feedback mode of the primary beam index is similar to that of the reference beam index, and is not described here.
  • L 1 and L 2 are as described above. among them,
  • L 1 and L 2 are as described above.
  • L 1 and L 2 are as described above.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data transmitted to the mobile station. The base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the beam selection range can be expanded, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG. 13 and FIG. 14 are diagrams showing an example of beam selection in the case of a multi-port antenna according to a beam selection method according to an embodiment of the present invention, wherein FIG. 13 shows a diagonally intersecting and cross-interval beam in the case of each antenna port.
  • a schematic diagram of the selection range is shown.
  • Figure 14 shows a schematic diagram of the beam selection range of laterally spaced or longitudinally spaced in the case of each antenna port. It can be seen that in the above example, the number of beams of the beam group is eight, but in other embodiments of the present invention, the number of beams of the beam group is not necessarily limited to eight.
  • the UE can perform the beam selection method described above. Since the operation of the UE is substantially the same as the steps of the beam selection method described above, only a brief description thereof will be made herein, and a repeated description of the same content will be omitted.
  • the UE 1500 includes a third dominant beam selection unit 1510 and a third combined beam selection unit 1520. It is to be appreciated that FIG. 15 only shows components related to embodiments of the present invention, while other components are omitted, but this is merely illustrative, and the UE 1500 may include other components as needed.
  • the third dominant beam selecting unit 1510 selects one dominant beam from the plurality of beams. As described above, the third dominant beam selecting unit 1510 may select one dominant beam from the plurality of beams according to conditions associated with channel quality, data throughput, or transmission power of the channel corresponding to each beam. Specifically, the third dominant beam selecting unit 1510 may perform channel estimation for each beam to determine the channel quality of the channel corresponding to each beam, which may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • the third combined beam selecting unit 1520 may select one combined beam from the plurality of beams according to the selected dominant beam, where the dominant beam and the combined beam are both located in one beam group, and the beam in the beam group They are orthogonal to each other and not adjacent.
  • the selection of the combined beam by the third combined beam selection unit 1520 will not be limited by the proximity to the dominant beam, nor to the upper right limit of the dominant beam in the beam set that must be located in a defined number (eg, 8). Instead, a quadrature beam with the best channel quality after combining with the dominant beam can be searched for and selected as a combined beam around the dominant beam. In the process of searching for combined beams, there are many ways to search.
  • the combined beam may be first searched within a range adjacent to the dominant beam, and if the search result is not ideal, the combined beam may be searched for in a range not adjacent to the dominant beam, and finally the combination is finally determined. Beam. In addition, it is also possible to search for and determine the combined beam directly within a range that is not adjacent to the dominant beam.
  • the beam group and its corresponding reference beam may also be determined according to the dominant beam and the combined beam, wherein the beam group includes the dominant beam and the combined beam, the reference A beam is used to indicate the range of the beam set and is different from the dominant beam.
  • the pilot beam and the combined beam may be used to determine a beam group including a preset number (such as 8 beams), and the beam group is determined based on the beam group.
  • Reference beam In the above example, the beam groups shown each include 8 beams, but in practical applications, the number of beams of the beam group may be any number.
  • the beam group may include 2 n or 2 n + One beam, and for different antenna port numbers, beam groups with the same number of beams can be set to make the feedback load the same, thus simplifying system setting.
  • the position of the reference beam at the beam set can be preset and can be located anywhere in the beam set.
  • the reference beam can be located as close as possible to the dominant beam.
  • the range of the beam set and the relative position of the reference beam in the beam set may be specified by the base station to the mobile station, or may be fed back to the base station by the mobile station, or may be learned by the base station and the mobile station based on pre-defined rules.
  • the reference beam may be the same or different than the dominant beam.
  • the reference beam may also be undefined, and the dominant beam and the combined beam combined therewith may be directly selected.
  • information indicating the reference beam may be fed back to the base station, and indicating, according to the information, the selected dominant beam and the combined beam are opposite to the base station.
  • the position of the reference beam may be fed back to the base station, and indicating, according to the information, the selected dominant beam and the combined beam are opposite to the base station.
  • the dominant beam index and the combined beam index may be separately fed back to the base station, and the dominant beam index may be fed back to the base station, and the combined beam information is fed back by the combined beam relative to the position of the dominant beam.
  • the feedback mode of the primary beam index is similar to that of the reference beam index, and is not described here.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data transmitted to the mobile station. The base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the mobile station according to the embodiment of the present invention can expand the beam selection range, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • FIG. 16 shows a flow diagram of a beam selection method 1600, which may be performed by a base station, in accordance with an embodiment of the present invention.
  • the beam selection method 1600 performed by the base station shown in FIG. 16 is similar to the beam selection method 1100 performed by the mobile station shown in FIG. 11, and the same or similar expressions are not described herein again.
  • the base station selects one dominant beam from among a plurality of beams.
  • the base station may select one dominant beam from the plurality of beams according to conditions associated with the channel quality, data throughput, or transmission power of the channel corresponding to each beam fed back by the mobile station.
  • the base station may acquire a channel estimation performed by the mobile station for each beam, thereby determining a channel quality of a channel corresponding to each beam, and the channel quality may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • a combined beam is selected from a plurality of beams according to the selected dominant beam, and the dominant beam and the combined beam are both located in one beam group, and beams in the beam group are orthogonal to each other And not adjacent.
  • the selection of the combined beam will not be limited by the proximity of the dominant beam, nor to the previously mentioned limit of the upper right of the dominant beam in a limited number of (eg, 8) beam sets. It is possible to search for and select a quadrature beam with the best channel quality after combining with the dominant beam as a combined beam around the dominant beam. In the process of searching for combined beams, there are many ways to search.
  • the combined beam may be first searched within a range adjacent to the dominant beam, and if the search result is not ideal, the combined beam may be searched for in a range not adjacent to the dominant beam, and finally the combination is finally determined. Beam. In addition, it is also possible to search for and determine the combined beam directly within a range that is not adjacent to the dominant beam.
  • the base station may transmit information to the mobile station using the selected combination of the dominant beam and the combined beam.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data sent to the mobile station.
  • the base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the beam selection range can be expanded, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • the base station can perform the beam selection method described above. Since the operation of the base station is substantially the same as the steps of the beam selection method described above, only a brief description thereof will be made herein, and a repeated description of the same content will be omitted.
  • the base station 1700 includes a fourth dominant beam selecting unit 1710, a fourth combined beam selecting unit 1720, and a second transmitting unit 1730. It is to be appreciated that FIG. 17 only shows components related to embodiments of the present invention, while other components are omitted, but this is merely illustrative, and base station 1700 can include other components as needed.
  • the fourth dominant beam selecting unit 1710 selects one dominant beam from the plurality of beams.
  • the fourth dominant beam selecting unit 1710 may select one dominant beam from the plurality of beams according to conditions associated with the channel quality, data throughput, or transmission power of the channel corresponding to each beam fed back by the mobile station.
  • the base station may acquire a channel estimation performed by the mobile station for each beam, thereby determining a channel quality of a channel corresponding to each beam, and the channel quality may be represented by, for example, a channel quality indicator (CQI) or the like.
  • CQI channel quality indicator
  • the fourth combined beam selecting unit 1720 may select one combined beam from the plurality of beams according to the selected dominant beam, where the dominant beam and the combined beam are both located in one beam group, and the beam in the beam group They are orthogonal to each other and not adjacent.
  • the choice of the combined beam will not be limited by the proximity of the dominant beam, nor by the previously mentioned limit that must be located in the upper right of the dominant beam in a defined number (eg 8) of beam sets, but may be in the dominant beam
  • the orthogonal beam with the best channel quality after combining with the dominant beam is searched and selected as a combined beam. In the process of searching for combined beams, there are many ways to search.
  • the combined beam may be first searched within a range adjacent to the dominant beam, and if the search result is not ideal, the combined beam may be searched for in a range not adjacent to the dominant beam, and finally the combination is finally determined. Beam. In addition, it is also possible to search for and determine the combined beam directly within a range that is not adjacent to the dominant beam.
  • the second transmitting unit 1730 may transmit information to the mobile station using the selected combination of the dominant beam and the combined beam.
  • the base station may acquire a corresponding CSI-RS or CSI process according to the determined dominant beam and combined beam, and then determine a precoding vector suitable for data sent to the mobile station. The base station can then precode and transmit the data transmitted to the mobile station using the precoding vector.
  • the base station according to the embodiment of the present invention can expand the beam selection range, thereby optimizing the configuration of the channel transmission resource, increasing the coverage of the channel transmission, and improving the information transmission quality.
  • the beam selection method in the beam selection method, the mobile station, and the selected beam group in the base station in the embodiment of the present invention may vary according to the requirements of the actual application.
  • 18 and 19 are schematic diagrams showing the beam group selection range in the embodiment of the present invention, respectively.
  • the range of beam groups selected in the embodiment of the present invention may include a dominant beam and all adjacent orthogonal beams thereof, and the number of beams in the beam group may be, for example, nine.
  • the selected beam group in the embodiment of the present invention also includes 9 beams, but may include a dominant beam and some orthogonal beams adjacent thereto or not adjacent thereto.
  • the combined beam can be selected according to the statistical result in the embodiment of the present invention as shown in FIG.
  • the statistical result here refers to the position of the selected combined beam relative to the dominant beam after determining the dominant beam, and the combined beam with high frequency is formed into a beam group, which is the default between the base station and the user.
  • the beam set can be determined, and then the combined beam is selected from the beam set.
  • the beam group in the embodiment of the present invention may also include other numbers of beams in practical applications.
  • a base station in an embodiment of the invention is capable of accommodating one or more (e.g., three) (also referred to as segments) cells.
  • the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each smaller area can utilize a base station subsystem (for example, a small base station for indoor use: RRH: Remote Radio Head) ) to provide communication services.
  • a base station subsystem for example, a small base station for indoor use: RRH: Remote Radio Head
  • the terms "cell” or “segment” refer to a portion or the entirety of a coverage area of a base station, and/or a base station subsystem that performs communication services in the coverage area.
  • a base station is sometimes also referred to as a fixed station, a NodeB, an eNodeB (eNB), an access point, a femto cell, a small cell, and the like.
  • the mobile station in the embodiment of the present invention varies from one skilled in the art, and is sometimes referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, and a mobile subscriber station. , access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or other suitable terminology.
  • each functional block represents a functional block of a functional unit.
  • These functional blocks are realized by any combination of hardware and/or software.
  • the means for realizing each functional block is not particularly limited. That is, each functional block may be implemented by one device that is physically and/or logically combined, or two or more devices that are physically and/or logically separated may be directly and/or indirectly (eg, wired and/or Or wireless) connection, implemented by these multiple devices.
  • a base station, a mobile station, or the like in one embodiment of the present invention can function as a computer that performs processing of the beam selection method of the present invention.
  • the base station and the mobile station may be physically configured as a computer device including a processor, a memory, a memory, a communication device, an input device, an output device, a bus, and the like.
  • the term "device” can be interpreted as a circuit, a device, a unit, or the like.
  • Each function in the base station and the mobile station reads the specified software (program) on hardware such as a processor or a memory, and the processor performs calculations, and controls communication of the communication device, memory, and data in the memory. Take and/or write to achieve.
  • the processor operates, for example, on an operating system to control the computer as a whole.
  • the processor may be constituted by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU Central Processing Unit
  • the processor reads a program (program code), a software module, data from a memory and/or a communication device into a memory, and performs various processes in accordance with the contents thereof.
  • program program code
  • a program for causing a computer to execute at least a part of the operations described in the above embodiments is used.
  • the control unit of the mobile station is stored in the memory and can be implemented by a control program that operates in the processor, and other functional blocks can be implemented in the same manner.
  • the various processes described above are described in terms of execution in one processor, but may be performed simultaneously or sequentially by two or more processors.
  • the processor can be mounted on more than one chip. It should be noted that the program can be transmitted from the network via the communication circuit.
  • the memory is a recording medium readable by a computer, and may be configured by, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory).
  • Memory can be called a register, a cache, a main memory (primary storage), and the like.
  • the memory can store an executable program (program code), a software module, and the like for implementing the wireless communication method of one embodiment of the present invention.
  • the memory is a computer-readable recording medium, and may be, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), At least one of a smart card, a flash memory (for example, a flash memory card, a flash memory stick, a thin flash memory), a floppy disk (registered trademark of a floppy disk), and a magnetic stripe.
  • the memory can be referred to as an auxiliary storage device.
  • the above storage medium may be, for example, a database including a memory and/or a memory, a server, or the like.
  • the communication device is hardware (transceiver device) that performs communication between computers via a wired and/or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, and the like, for example.
  • a network device a network controller, a network card, a communication module, and the like, for example.
  • the above-described transceiver antenna, amplifying unit, transceiver unit, transmission path interface, and the like can be realized by a communication device.
  • the input device is an input device (such as a keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
  • the output device is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs an output to the outside. It should be noted that the input device and the output device may be an integrated structure (for example, a touch screen).
  • each device such as a processor and a memory is connected by a bus in which information is communicated.
  • the bus can be composed of a single bus or a different bus between devices.
  • the base station and the mobile station may be configured by a hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and the hardware may be used to implement each function. Part or all of the block.
  • the processor can be implemented by at least one of the hardware.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 5G
  • FRA Full Radio Access
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB Universal Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 UWB (Ultra-WideBand
  • Bluetooth registered trademark
  • Software is broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, and so on, and is referred to as software, firmware, middleware, microcode, hardware description language, or other name.
  • Applications software applications, packages, routines, subroutines, objects, executables, threads of execution, steps, functions, and more.
  • software, instructions, and the like can be transmitted and received via a transmission medium.
  • a transmission medium For example, software that uses wired technologies such as coaxial cable, fiber, twisted pair, and digital subscriber line (DSL) and/or wireless technologies such as infrared, wireless, and microwave to transmit from web pages, servers, or other remote data sources.
  • wired technologies such as coaxial cable, fiber, twisted pair, and digital subscriber line (DSL)
  • wireless technologies such as infrared, wireless, and microwave to transmit from web pages, servers, or other remote data sources.

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Abstract

本发明的实施例提供了一种波束选择方法、移动台和基站。根据本发明实施例的波束选择方法包括：从多个波束中选择一个主导波束；根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。

Description

波束选择方法、移动台和基站 技术领域
本申请涉及通信技术领域，并且具体涉及波束选择方法、移动台和基站。
背景技术
传统上，基站使用一维天线来与移动台进行通信。近年来，为了进一步提高基站与移动台之间的信号传输质量，增加无线通信系统的吞吐量，提出了三维波束赋形技术。在三维波束赋形技术中，基站使用二维天线阵列与移动台进行通信，与一维天线相比，二维天线阵列除了在水平维度上部署天线并进行水平波束控制以外，还在垂直维度（高度方向）上部署天线并进行波束控制，从而实现三维波束赋形。通过三维波束赋形，可以获得更高的波束赋形增益，并且使处于不同位置（尤其是不同高度位置）上的移动台获得良好的信号传输质量。
另一方面，在基站向移动台发送下行链路数据之前，需要进行信道估计。具体地，基站向移动台发送信道状态信息参考信号（CSI-RS），移动台通过CSI-RS进行信道估计，反馈秩指示符（RI）、预编码矩阵索引（PMI）、信道质量指示符（CQI）等信息，随后基站根据移动台所反馈的信息对数据进行预编码。在现有技术中，针对用于CSI报告的线性组合码本的设计，移动台往往会从多个波束中选择一个波束组，并从这个波束组中确定其中的一个或两个波束并反馈给基站。但是，目前这种波束选择方法往往会使得波束的选择具有一定的局限性，可能会降低信息传输过程中的信道质量或者减小信息传输的覆盖范围。
发明内容
根据本发明的一个方面，提供了一种波束选择方法，所述方法由移动台执行，包括：从多个波束中选择一个主导波束；根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主 导波束不同。
根据本发明的另一方面，提供了一种波束选择方法，所述方法由移动台执行，包括：从多个波束中选择一个主导波束；根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。
根据本发明的另一方面，提供了一种波束选择方法，所述方法由基站执行，包括：从多个波束中选择一个主导波束；根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同；利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
根据本发明的另一方面，提供了一种波束选择方法，所述方法由基站执行，包括：从多个波束中选择一个主导波束；根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻；利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
根据本发明的另一方面，提供了一种移动台，包括：第一主导波束选择单元，配置为从多个波束中选择一个主导波束；第一组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；第一参考波束确定单元，配置为根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
根据本发明的另一方面，提供了一种基站，包括：第二主导波束选择单元，配置为从多个波束中选择一个主导波束；第二组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；第二参考波束确定单元，配置为根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不 同；第一发送单元，配置为利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
根据本发明的另一方面，提供了一种移动台，包括：第三主导波束选择单元，配置为从多个波束中选择一个主导波束；第三组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。
根据本发明的另一方面，提供了一种基站，包括：第四主导波束选择单元，配置为从多个波束中选择一个主导波束；第四组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻；第二发送单元，配置为利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
利用根据本发明上述方面的波束选择方法、移动台和基站，可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
附图说明
通过结合附图对本发明的实施例进行详细描述，本发明的上述和其它目的、特征、优点将会变得更加清楚。
图1示出码本的设计方案示意图，其中图1（a）和图1（b）分别表示两种波束选择方案；
图2示出基站基于DFT矩阵确定的码本的示意图；
图3示出图2中码本的主导波束的正交波束组合示意图；
图4示出32端口组合波束的选择方案示意图；
图5示出8端口和16端口中波束组的覆盖范围示意图；
图6示出本发明第一实施例的波束选择方法流程图；
图7示出本发明第一实施例在多端口天线情况下的波束选择示例图；
图8示出本发明第一实施例的移动台结构框图；
图9示出本发明第二实施例的波束选择方法流程图；
图10示出本发明第二实施例的基站结构框图；
图11示出本发明第三实施例的波束选择方法流程图；
图12示出本发明第三实施例的组合波束搜索范围示意图，其中图12（a）表示与主导波束横向间隔的搜索范围，图12（b）表示与主导波束纵向间隔的搜索范围，图12（c）、（d）表示与主导波束对角线相接并交叉间隔的搜索范围；
图13示出本发明第三实施例的波束选择方法在多端口天线情况下对角线相接且交叉间隔的波束选择示例图；
图14示出本发明第三实施例的波束选择方法在多端口天线情况下横向间隔或纵向间隔的波束选择示例图；
图15示出本发明第三实施例的移动台结构框图；
图16示出本发明第四实施例的波束选择方法流程图；
图17示出本发明第四实施例的基站结构框图；
图18示出本发明一个实施例的波束组选择示意图；
图19示出本发明另一个实施例的波束组选择示意图。
具体实施方式
下面将参照附图来描述根据本发明实施例的波束选择方法、移动台和基站。在附图中，相同的参考标号自始至终表示相同的元件。应当理解：这里描述的实施例仅仅是说明性的，而不应被解释为限制本发明的范围。
Release 13的codebook设计是两阶的：W=W1W2，W1选出一组波束（beam），W2从一组beam中优选出一个beam，即Release 13的codebook是beam选择。在Release 14advanced CSI的讨论中，PMI增强是讨论课题之一，在PMI的增强方案中，beam的线性组合是备选方案之一。与Release 13的beam选择相比，beam组合对多个beam进行量化并组合。Beam的线性组合可以提高信道量化的精度，提高反馈的精度，从而提高系统性能。在Release 14advanced CSI的反馈中，codebook是由两个正交的beam组合成的，这两个正交的beam位于一个beam组中。现有方案的设计对beam组的构成和组合beam的选择做了一些限定来减少反馈的开销。如正交beam组中的beam数最大不超过8个，beam组的形状是规则的：4*2或8*1等。
图1示出了码本（codebook）的设计方案，其中，图1（a）表示在多个波束中首先选择一组波束，然后再选择其中的一个波束b6的波束选择方案，而图1（b）表示选择一个主导波束（leading beam）b5并结合一个组合波束（combined beam）b7从而形成波束组合的波束选择方案。
图1（a）和图1（b）的波束选择方案均可应用在无线通信系统中，无线通信系统可以包括至少一个基站和至少一个移动台。基站可以与上层装置连接并继而连接到核心网络。其中，基站可配备有二维天线阵列，并且通过该天线阵列与移动台通信。首先，基站可以基于DFT矩阵设计码本。图2示出了基站基于DFT矩阵确定的码本的示意图。图2中的参数N 1、N 2分别为第一维度和第二维度的天线端口数，O 1、O 2则分别为第一维度和第二维度的过采样率。随后，基站可以将确定的码本共享至移动台，从而基站和移动台共享一个已知的码本集合，并基于此码本集合执行后续的信息传输。在移动台从多个波束中选择某一个或几个波束并反馈给基站之后，基站可以基于该波束反馈进行下行链路数据的发送。
具体地，在图1（b）所示的方案中，结合图2所示，移动台可以根据信道状况并基于共享的已知码本首先选择一个主导波束（图2左下角的灰色波束），随后，根据所确定的主导波束可以获取与之正交的所有正交波束（图2中阴影部分所覆盖的波束），并将其简化为图3中所示的正交波束组合。在图3示出的正交波束组合中，包含一个由方框框出的用于从中选择与主导波束组合的组合波束的波束组，在此波束组中，主导波束位于方框的左下角。可以得知，在本方案中，主导波束索引可以表示为：k 1 (0)=i 1,1=0,1,…N 1O 1-1，k 2 (0)=i 1,2=0,1,…N 2O 2-1，其中k 1 (0)和k 2 (0)分别为主导波束在第一维度和第二维度中的映射位置。而相应地，所能够选择的组合波束索引可以表示为：k 1 (1)=i 1,1+O 1d 1，k 2 (1)=i 1,2+O 2d 2，k 1 (1)和k 2 (1)分别为组合波束在第一维度和第二维度中的映射位置。其中，由于组合波束需要在图3中所示的正交波束组合中方框限定的波束组中进行选择，考虑到通信系统的反馈负载的限制，一般来说，可以将波束组中波束的个数限定为8个。而根据不同的天线端口数推知的N 1、N 2的取值范围，可以限定d 1=0,…,min(N 1,L 1)-1，d 2=0,…,min(N 2,L 2)-1,(d 1,d 2)≠(0,0)，其中L 1=4，L 2=2（N 1≥N 2且N 2≠1）；L 1=2，L 2=4（N 1＜N 2且N 2≠1）；L 1=8，L 2=1（N 2=1）。也就是说，例如，当天线端口数为24时， （N 1,N 2）可以有（2,6）、（3,4）、（4,3）、（6,2）、（12,1）多种选择，则当（N 1,N 2）取值为（4,3）或（6,2）时，波束组L 1=4，L 2=2；当（N 1,N 2）取值为（3,4）或（2,6）时，波束组L 1=2，L 2=4；当（N 1,N 2）取值为（12,1）时，波束组L 1=8，L 2=1。这几种波束组的选择方式中，波束组中包含的波束个数均为8个。这里所指的波束的个数可以由基站确定并通知移动台，也可以由移动台建议给基站，另外还可以是基站和移动台基于一定的原则共同默认的个数。此外，上述波束个数为8个仅为示例，在实际应用中，波束组中能够包含的波束个数可以更多，也可以更少，在此不做限定。
由于在上述的波束选择方案所限定的波束组中，其包含的主导波束必须位于其左下角，也就意味着其组合波束只能在波束组的范围内主导波束的右上角的位置进行选择。因此，在天线端口数较大（例如为20,24,28,32等）时，可能导致一些不能包含在此波束组中的其他组合波束不能被选择，而这些不能被选择的组合波束有可能使得组合后的信道状况更好。这就导致了组合波束的选择局限性，并可能影响通信系统中信息传输的质量。图4示出了32端口（（N 1,N 2）取值为（（4,4）时）组合波束的选择方案示意图。可以看出，在当前所定义的主导波束位于左下角且包含8个波束的波束组中，只能够选择右上角的可选组合波束与主导波束组合，但是实际上，位于主导波束右下方不包含在波束组中的最佳波束组才是能够使得信道状况最佳的组合波束，在当前方案中，由于波束组的划分局限性，这一最佳组合波束是无法被考虑和选取的。
另外，由于考虑到反馈负载的权衡问题，波束组中波束的个数只能选择有限个，而当天线端口数逐渐增多，所选择的波束组中所有波束的覆盖范围就相应地越来越小。图5示出了8端口和16端口中波束组的覆盖范围的区别，可以看出，在16端口的情况下，可选组合波束的覆盖范围相较8端口天线缩小了一倍，而当天线端口数更多时，这一问题将更加严重。
（第一实施例）
针对上述组合波束选择的局限性问题，考虑提出如下波束选择方法。图6示出根据本发明实施例的波束选择方法600的流程图，所述方法可以由移动台执行。
如图6所示，在步骤S601中，移动台从多个波束中选择一个主导波束。 在本步骤中，如前所述，移动台可以根据与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，移动台可以针对每个波束进行信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。此外，移动台还可以针对每个波束确定对应的秩指示符（RI）、预编码矩阵索引（PMI）等。
在步骤S602中，根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻。在此步骤中，对组合波束的选择将不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。确定组合波束的方法与上述确定主导波束的方法类似，同样可以通过主导波束与组合波束组合后的信道质量、数据吞吐量或传输功率等相关联的条件来选择所述组合波束。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组。在实际应用中，波束组的波束个数可以为任意个，优选地，为了节省反馈开销，波束组可以包含2 n或2 n+1个波束，另外针对不同的天线端口数，可以设定具有相同波束个数的波束组，以使反馈负载相同，从而简化系统设置。
在步骤S603中，根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意确定的预设位置。可选地，参考波束可以位于尽量靠近主导波束的位置，并且优选地，参考波束可以位于所述波束组的左下角。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，移动台可以根据上述步骤S601-S602直接选择所述主导波束和与其组合的组合波束，完成上述波束选择方法。
可选地，当移动台确定波束组的范围和参考波束的位置后，移动台可以向基站反馈指示所述参考波束的信息，并基于所述信息向基站指示所选择的所述主导波束和所述组合波束相对于所述参考波束的位置。在本发明的实施例中，移动台可以根据需要选择任何合适的方式来反馈所述参考波束的信息，例如，移动台可以反馈所述参考波束的索引，并通过反馈所述主导波束和所述组合波束相对于参考波束的位置来使基站确定所述主导波束和所述组合波束。移动台的反馈方式可以由基站配置，例如，移动台可以周期性地或非周期性的反馈所述参考波束索引，此外，移动台可以以较长的时间间隔和/或针对宽频带来反馈所述参考波束索引。移动台可以在与RI相同的定时或频率上反馈所述参考波束索引。在移动台被配置为进行非周期性反馈的情况下，移动台可以将参考波束的索引与RI、PMI和CQI中的至少一个一起反馈；在移动台被配置为周期性反馈的情况下，参考波束索引的反馈周期可以与RI、PMI和/或CQI的反馈周期相同或不同。
另外，当移动台无需确定参考波束时，移动台可以向基站直接反馈指示所述主导波束和所述组合波束的信息。例如，移动台可以向基站分别反馈所述主导波束索引和所述组合波束索引，也可以向基站反馈所述主导波束索引，并通过所述组合波束相对所述主导波束的位置反馈所述组合波束的信息。主导波束索引的反馈方式与上述参考波束索引的反馈方式相似，在此不再赘述。
其中，本发明实施例中的波束选择方法与当前标准化工作计划（working assumption）的区别在于：当主导波束索引表示为：k 1 (0)=i 1,1=0,1,…N 1O 1-1，k 2 (0)=i 1,2=0,1,…N 2O 2-1时，其所能够选择的组合波束索引可以修改为：k 1 (1)=i 1,1±O 1d 1，k 2 (1)=i 1,2±O 2d 2。其中，根据不同的天线端口数推知的N 1、N 2的取值范围，同样可以限定d 1=0,…,min(N 1,L 1)-1，d 2=0,…,min(N 2,L 2)-1,(d 1,d 2)≠(0,0)。L 1、L 2的取值如前所述。
在接收到移动台反馈的波束索引之后，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
在根据本发明实施例的波束选择方法中，可以扩大波束选择范围，从 而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
图7示出根据本发明实施例的波束选择方法在多端口天线情况下的波束选择示例图，分别为20端口（（N 1,N 2）取值为（（5,2）），28端口（（N 1,N 2）取值为（（7,2））,24端口（1）（（N 1,N 2）取值为（（6,2））和24端口（2）（（N 1,N 2）取值为（（3,4））。可以看出，在上述示例中波束组的波束个数均为8个，但在本发明的其他实施例中，波束组的波束个数并不必局限于8个。
下面，参照图8来描述根据本发明第一实施例的移动台。该UE可以执行上述波束选择方法。由于该UE的操作与上文所述的波束选择方法的各个步骤基本相同，因此在这里只对其进行简要的描述，而省略对相同内容的重复描述。
如图8所示，UE800包括第一主导波束选择单元810、第一组合波束选择单元820和第一参考波束确定单元830。需要认识到，图8仅示出与本公开的实施例相关的部件，而省略了其他部件，但这只是示意性的，根据需要，UE 800可以包括其他部件。
第一主导波束选择单元810从多个波束中选择一个主导波束。如前所述，第一主导波束选择单元810可以根据与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，第一主导波束选择单元810可以针对每个波束进行信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
第一组合波束选择单元820可以根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻。第一组合波束选择单元820对组合波束的选择将不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。确定组合波束的方法与上述确定主导波束的方法类似，同样可以通过主导波束与组合波束组合后的信道质量、数据吞吐量或传输功率等相关联的条件来选择所述组合波束。
第一参考波束确定单元830可以根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，第一参考波束确定单元830可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组，并基于此波束组确定其参考波束。参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意位置。可选地，参考波束可以位于尽量靠近主导波束的位置，并且优选地，参考波束可以位于所述波束组的左下角。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，第一主导波束选择单元810和第一组合波束选择单元820可以直接选择所述主导波束和与其组合的组合波束。
此外，可选地，当第一参考波束确定单元830确定波束组的范围和参考波束的位置后，可以向基站反馈指示所述参考波束的信息，并基于所述信息向基站指示所选择的所述主导波束和所述组合波束相对于所述参考波束的位置。在本发明的实施例中，可以根据需要选择任何合适的方式来反馈所述参考波束的信息，例如，可以反馈所述参考波束的索引，并通过反馈所述主导波束和所述组合波束相对于参考波束的位置来使基站确定所述主导波束和所述组合波束。
另外，当无需确定参考波束时，移动台可以向基站直接反馈指示所述主导波束和所述组合波束的信息。例如，可以向基站分别反馈所述主导波束索引和所述组合波束索引，也可以向基站反馈所述主导波束索引，并通过所述组合波束相对所述主导波束的位置反馈所述组合波束的信息。主导波束索引的反馈方式与上述参考波束索引的反馈方式相似，在此不再赘述。
在接收到移动台反馈的波束索引之后，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
根据本发明实施例的移动台可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
（第二实施例）
图9示出根据本发明实施例的波束选择方法900的流程图，所述方法可以由基站执行。图9所示的由基站执行的波束选择方法900与图6中所示的由移动台执行的波束选择方法600类似，其相同或相似的表述在此不再赘述。
如图9所示，在步骤S901中，基站从多个波束中选择一个主导波束。在本步骤中，如前所述，基站可以根据移动台所反馈的与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，基站可以获取移动台针对每个波束进行的信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
在步骤S902中，根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻。在此步骤中，基站对组合波束的选择将不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。确定组合波束的方法与上述确定主导波束的方法类似，基站同样可以通过主导波束与组合波束组合后的信道质量、数据吞吐量或传输功率等相关联的条件来选择所述组合波束。
在步骤S903中，根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，基站可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组，并基于此波束组确定其参考波束。参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意位置。可选地，参考波束可以位于尽量靠近主导波束的位置，并且优选地，参考波束可以位于所述波束组的左下角。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，基站可以根据上述步骤S901-S902直接选择所述主导波束和与其组合的组合波束。
在步骤S904中，基站可以利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。其中，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
在根据本发明实施例的波束选择方法中，可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
下面，参照图10来描述根据本发明第二实施例的基站。该基站可以执行上述波束选择方法。由于该基站的操作与上文所述的波束选择方法的各个步骤基本相同，因此在这里只对其进行简要的描述，而省略对相同内容的重复描述。
如图10所示，基站1000包括第二主导波束选择单元1010、第二组合波束选择单元1020、第二参考波束确定单元1030和第一发送单元1040。需要认识到，图10仅示出与本发明的实施例相关的部件，而省略了其他部件，但这只是示意性的，根据需要，基站1000可以包括其他部件。
第二主导波束选择单元1010从多个波束中选择一个主导波束。如前所述，第二主导波束选择单元1010可以根据移动台所反馈的与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，第二主导波束选择单元1010可以获取移动台针对每个波束进行的信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
第二组合波束选择单元1020可以根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻。第二组合波束选择单元1020对组合波束的选择将不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。确定组合波束的方法与上述确定主导波束的方法类似，基站同样可以通过主导波束与组合波束组合后的信道质量、数据吞吐量或传输功率等相关联的条件来选择所述组合波束。
第二参考波束确定单元1030可以根据所述波束组确定相应的参考波 束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，第二参考波束确定单元1030可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组，并基于此波束组确定其参考波束。参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意位置。可选地，参考波束可以位于尽量靠近主导波束的位置，并且优选地，参考波束可以位于所述波束组的左下角。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，基站可以直接选择所述主导波束和与其组合的组合波束。
第一发送单元1040可以利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。其中，第一发送单元1040可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，第一发送单元1040可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
根据本发明实施例的基站可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
（第三实施例）
针对上述组合波束选择的局限性问题，特别是多端口天线情况下覆盖范围较窄的问题，考虑提出如下波束选择方法。图11示出根据本发明实施例的波束选择方法1100的流程图，所述方法可以由移动台执行。
如图11所示，在步骤S1101中，移动台从多个波束中选择一个主导波束。在本步骤中，如前所述，移动台可以根据与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，移动台可以针对每个波束进行信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。此外，移动台还可以针对每个波束确定对应的秩指示符（RI）、预编 码矩阵索引（PMI）等。
在步骤S1102中，根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。在此步骤中，对组合波束的选择将不受与主导波束相邻的限制，也不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。在搜索组合波束的过程中，可以有多种搜索方式。其中，可以首先在与主导波束相邻的范围内搜索所述组合波束，当搜索结果不理想的情况下，可以随后在与主导波束不相邻的范围内搜索组合波束，并最终确定所述组合波束。此外，也可以直接在与主导波束不相邻的范围内搜索并确定组合波束。
所述与主导波束不相邻可以有多种情况，图12分别示出了在主导波束确定的情况下，确定组合波束搜索范围的各种情况，如与主导波束横向间隔（图12（a））、纵向间隔（图12（b））或与主导波束对角线相接并交叉间隔（图12（c）、（d））。上述组合波束的搜索范围仅为示例，移动台还可以根据其余的排布方式确定该范围，并且，组合波束的搜索范围可以与主导波束横向、纵向或斜向间隔任意数量的行列数，而不仅局限于一行和/或一列。在本发明实施例中，确定组合波束的方法与上述确定主导波束的方法类似，同样可以通过主导波束与组合波束组合后的信道质量、数据吞吐量或传输功率等相关联的条件来选择所述组合波束。
在本发明一个实施例中，移动台可以根据所述主导波束和所述组合波束确定波束组及其相应的参考波束，其中，所述波束组包含所述主导波束和所述组合波束，所述参考波束用于指示所述波束组的范围，且与所述主导波束相同或不同。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组，并基于此波束组确定其参考波束。在上述示例中，所示波束组均包含8个波束，但在实际应用中，波束组的波束个数可以为任意个，优选地，为了节省反馈开销，波束组可以包含2 n或2 n+1个波束，另外针对不同的天线端口数，可以设定具有相同波束个数的波束组，以使反馈负载相同，从而简化系统设 置。参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意位置。可选地，参考波束可以位于尽量靠近主导波束的位置。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束相同或不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，移动台可以根据上述步骤S1101-S1102直接选择所述主导波束和与其组合的组合波束。
可选地，当移动台确定波束组的范围和参考波束的位置后，移动台可以向基站反馈指示所述参考波束的信息，并基于所述信息向基站指示所选择的所述主导波束和所述组合波束相对于所述参考波束的位置。在本发明的实施例中，移动台可以根据需要选择任何合适的方式来反馈所述参考波束的信息，例如，移动台可以反馈所述参考波束的索引，并通过反馈所述主导波束和所述组合波束相对于参考波束的位置来使基站确定所述主导波束和所述组合波束，当主导波束和组合波束与参考波束距离较大时，移动台还可以通过反馈主导波束和/或组合波束在码本中的周期性映射来体现主导波束或组合波束的位置。移动台的反馈方式可以由基站配置，例如，移动台可以周期性地或非周期性的反馈所述参考波束索引，此外，移动台可以以较长的时间间隔和/或针对宽频带来反馈所述参考波束索引。移动台可以在与RI相同的定时或频率上反馈所述参考波束索引。在移动台被配置为进行非周期性反馈的情况下，移动台可以将参考波束的索引与RI、PMI和CQI中的至少一个一起反馈；在移动台被配置为周期性反馈的情况下，参考波束索引的反馈周期可以与RI、PMI和/或CQI的反馈周期相同或不同。
另外，当移动台无需确定参考波束时，移动台可以向基站直接反馈指示所述主导波束和所述组合波束的信息。例如，移动台可以向基站分别反馈所述主导波束索引和所述组合波束索引，也可以向基站反馈所述主导波束索引，并通过所述组合波束相对所述主导波束的位置反馈所述组合波束的信息。主导波束索引的反馈方式与上述参考波束索引的反馈方式相似，在此不再赘述。
其中，本发明实施例中的波束选择方法与当前标准化工作计划 （working assumption）的区别在于：当主导波束索引表示为：k 1 (0)=i 1,1=0,1,…N 1O 1-1，k 2 (0)=i 1,2=0,1,…N 2O 2-1时，针对对角线相接且交叉间隔的情况，组合波束索引可以修改为：k 1 (1)=i 1,1+O 1d 1，k 2 (1)=i 1,2+O 2d 2。其中，根据不同的天线端口数推知的N 1、N 2的取值范围，同样可以限定d 1=0,…,min(N 1,L 1)-1，d 2=0,…,min(N 2,L 2)-1,(d 1,d 2)≠(0,0)。L 1、L 2的取值如前所述。其中，
Figure PCTCN2018071318-appb-000001
其中，针对横向间隔一行的情况，组合波束索引修改为：k 1 (1)=i 1,1+2O 1d 1，k 2 (1)=i 1,2+O 2d 2。其中，d 1=0,…,min(N 1,L 1)-1，d 2=0,…,min(N 2,L 2)-1,(d 1,d 2)≠(0,0)。L 1、L 2的取值如前所述。
针对纵向间隔一行的情况，组合波束索引修改为：k 1 (1)=i 1,1+O 1d 1，k 2 (1)=i 1,2+2O 2d 2。其中，d 1=0,…,min(N 1,L 1)-1，d 2=0,…,min(N 2,L 2)-1,(d 1,d 2)≠(0,0)。L 1、L 2的取值如前所述。
在接收到移动台反馈的波束索引之后，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
在根据本发明实施例的波束选择方法中，可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
图13和图14示出根据本发明实施例的波束选择方法在多端口天线情况下的波束选择示例图，其中，图13示出在各天线端口情况下对角线相接且交叉间隔的波束选择范围示意图，图14示出在各天线端口情况下横向间隔或纵向间隔的波束选择范围示意图。可以看出，在上述示例中波束组的波束个数均为8个，但在本发明的其他实施例中，波束组的波束个数并不必局限于8个。
下面，参照图15来描述根据本发明第三实施例的移动台。该UE可以执行上述波束选择方法。由于该UE的操作与上文所述的波束选择方法的各个步骤基本相同，因此在这里只对其进行简要的描述，而省略对相同内容的 重复描述。
如图15所示，UE1500包括第三主导波束选择单元1510和第三组合波束选择单元1520。需要认识到，图15仅示出与本发明的实施例相关的部件，而省略了其他部件，但这只是示意性的，根据需要，UE 1500可以包括其他部件。
第三主导波束选择单元1510从多个波束中选择一个主导波束。如前所述，第三主导波束选择单元1510可以根据与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，第三主导波束选择单元1510可以针对每个波束进行信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
第三组合波束选择单元1520可以根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。第三组合波束选择单元1520对组合波束的选择将不受与主导波束相邻的限制，也不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。在搜索组合波束的过程中，可以有多种搜索方式。其中，可以首先在与主导波束相邻的范围内搜索所述组合波束，当搜索结果不理想的情况下，可以随后在与主导波束不相邻的范围内搜索组合波束，并最终确定所述组合波束。此外，也可以直接在与主导波束不相邻的范围内搜索并确定组合波束。
在本发明一个实施例中，还可以根据所述主导波束和所述组合波束确定波束组及其相应的参考波束，其中，所述波束组包含所述主导波束和所述组合波束，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
在本发明实施例中，在主导波束和组合波束选择完毕之后，可选地，可以利用主导波束和组合波束确定包含预设数量（如8个）波束的波束组，并基于此波束组确定其参考波束。在上述示例中，所示波束组均包含8个波束，但在实际应用中，波束组的波束个数可以为任意个，优选地，为了节省反馈开销，波束组可以包含2 n或2 n+1个波束，另外针对不同的天线端口数， 可以设定具有相同波束个数的波束组，以使反馈负载相同，从而简化系统设置。参考波束在波束组的位置可以预先设定，并且可以位于所述波束组的任意位置。可选地，参考波束可以位于尽量靠近主导波束的位置。波束组的范围和参考波束在波束组中的相对位置既可以由基站向移动台指定，也可以由移动台向基站反馈，或者可以由基站和移动台基于预先设定的规则获知。在本发明一个实施例中，参考波束可以与主导波束相同或不同。
当然，在本发明另一个实施例中，参考波束也可以不做限定，可以直接选择所述主导波束和与其组合的组合波束。
可选地，当确定波束组的范围和参考波束的位置后，可以向基站反馈指示所述参考波束的信息，并基于所述信息向基站指示所选择的所述主导波束和所述组合波束相对于所述参考波束的位置。
另外，当无需确定参考波束时，可以向基站直接反馈指示所述主导波束和所述组合波束的信息。例如，可以向基站分别反馈所述主导波束索引和所述组合波束索引，也可以向基站反馈所述主导波束索引，并通过所述组合波束相对所述主导波束的位置反馈所述组合波束的信息。主导波束索引的反馈方式与上述参考波束索引的反馈方式相似，在此不再赘述。
在接收到移动台反馈的波束索引之后，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
根据本发明实施例的移动台可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
（第四实施例）
图16示出根据本发明实施例的波束选择方法1600的流程图，所述方法可以由基站执行。图16所示的由基站执行的波束选择方法1600与图11中所示的由移动台执行的波束选择方法1100类似，其相同或相似的表述在此不再赘述。
如图16所示，在步骤S1601中，基站从多个波束中选择一个主导波束。在本步骤中，如前所述，基站可以根据移动台所反馈的与各个波束对应的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择 一个主导波束。具体地，基站可以获取移动台针对每个波束进行的信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
在步骤S1602中，根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。在此步骤中，对组合波束的选择将不受与主导波束相邻的限制，也不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。在搜索组合波束的过程中，可以有多种搜索方式。其中，可以首先在与主导波束相邻的范围内搜索所述组合波束，当搜索结果不理想的情况下，可以随后在与主导波束不相邻的范围内搜索组合波束，并最终确定所述组合波束。此外，也可以直接在与主导波束不相邻的范围内搜索并确定组合波束。
在步骤S1603中，基站可以利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。其中，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
在根据本发明实施例的波束选择方法中，可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
下面，参照图17来描述根据本发明第四实施例的基站。该基站可以执行上述波束选择方法。由于该基站的操作与上文所述的波束选择方法的各个步骤基本相同，因此在这里只对其进行简要的描述，而省略对相同内容的重复描述。
如图17所示，基站1700包括第四主导波束选择单元1710、第四组合波束选择单元1720和第二发送单元1730。需要认识到，图17仅示出与本发明的实施例相关的部件，而省略了其他部件，但这只是示意性的，根据需要，基站1700可以包括其他部件。
第四主导波束选择单元1710从多个波束中选择一个主导波束。如前所述，第四主导波束选择单元1710可以根据移动台所反馈的与各个波束对应 的信道的信道质量、数据吞吐量或传输功率等相关联的条件，从多个波束中选择一个主导波束。具体地，基站可以获取移动台针对每个波束进行的信道估计，从而确定每个波束对应的信道的信道质量，该信道质量例如可以用信道质量指示符（CQI）等表示。
第四组合波束选择单元1720可以根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。对组合波束的选择将不受与主导波束相邻的限制，也不受之前所提及的必须位于限定数量（如8个）的波束组中主导波束右上方的限制，而是可以在主导波束周围搜索并选择与主导波束组合后信道质量最好的正交波束作为组合波束。在搜索组合波束的过程中，可以有多种搜索方式。其中，可以首先在与主导波束相邻的范围内搜索所述组合波束，当搜索结果不理想的情况下，可以随后在与主导波束不相邻的范围内搜索组合波束，并最终确定所述组合波束。此外，也可以直接在与主导波束不相邻的范围内搜索并确定组合波束。
第二发送单元1730可以利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。其中，基站可以根据所确定的主导波束和组合波束获取对应的CSI-RS或CSI进程，继而确定适合于发送给该移动台的数据的预编码矢量。然后，基站可以使用该预编码矢量对发送给该移动台的数据进行预编码并发送。
根据本发明实施例的基站可以扩大波束选择范围，从而优化信道传输资源的配置，增加信道传输的覆盖范围，提高信息传输质量。
此外，如前所述，本发明实施例中的波束选择方法、移动台和基站中所选择的波束组包括的波束数量可以根据实际应用的要求而变化。图18和图19分别示出本发明实施例中的波束组选择范围示意图。如图18所示，本发明实施例中所选择的波束组范围可以包括主导波束及其周围所有相邻的正交波束，波束组中波束的数量可以例如为9个。如图19所示，本发明实施例中所选择的波束组同样包含9个波束，但可以包括主导波束和其周围与其相邻或不相邻的一些正交波束。其中，如图19所示的本发明实施例中可以根据统计的结果选择组合波束。这里的统计结果是指确定了主导波束之后，统计选择的组合波束相对于主导波束的位置，将出现频率高的组合波束组成 一个波束组，这个波束组是基站和用户共同默认的。在移动台反馈的时候指示出主导波束的信息，就可以确定这个波束组，然后从这个波束组中选出组合波束。当然，本发明实施例中的波束组在实际应用中也可以包含其他数量的波束个数。
本发明实施例中的基站能够容纳一个或者多个（例如三个）（也称作区段）小区。在基站容纳多个小区的情况下，基站的覆盖区域整体能够区隔成多个更小的区域，每个更小的区域能够利用基站子系统（例如屋内用的小型基站：RRH:Remote Radio Head）来提供通信服务。“小区”或者“区段”这些术语是指在该覆盖区域中进行通信服务的基站、及/或基站子系统的覆盖区域的一部分或者整体。此外，“基站”“eNB”“小区”及“区段”这些术语在本说明书中能够被互换使用。基站有时也称作固定站（fixed station）、NodeB、eNodeB(eNB）、接入点（access point）、毫微微小区，小型小区等。
本发明实施例中的移动台因本领域技术人员而异，有时称作用户站、移动单元、用户单元、无线单元、远程单元、移动设备、无线设备、无线通信设备、远程设备、移动用户站、接入终端、移动终端、无线终端、远程终端、手持设备、用户代理、移动客户端、客户端、或者其它合适的术语。
需要说明的是，用于上述实施方式的说明的方框图表示功能单位的功能块。这些功能块（构成部）通过硬件和/或软件的任意的组合而实现。另外，各功能块的实现手段不被特别地限定。即，各功能块可以由物理上及/或逻辑上联合的一个装置而实现，也可以将物理上及/或逻辑上分离的两个以上的装置直接及/或间接地(例如，有线和/或无线)连接，由这多个装置实现。
例如，本发明的一个实施方式中的基站、移动台等，可以起到进行本发明的波束选择方法的处理的计算机的作用。上述基站及移动台在物理上可以构成为包括处理器、内存、存储器、通信装置、输入装置、输出装置、总线等的计算机装置。
需要说明的是，在以下的说明中，“装置”这一词能够解读为电路、设备、单元等。关于基站及移动台中的各功能，是通过在处理器、内存等硬件上读取指定的软件（程序），处理器进行运算，且通过控制通信装置进行的通信、内存及存储器中的数据的读取和/或写入来实现的。
处理器例如对操作系统进行操作来对计算机整体进行控制。处理器可以 由包括与外围装置的接口、控制装置、运算装置、寄存器等的中央处理装置（CPU：CentralProcessingUnit）构成。
另外，处理器将程序（程序代码）、软件模块、数据从存储器和/或通信装置读取至内存，按照其内容执行各种处理。作为程序，使用使计算机执行上述实施方式中说明的动作的至少一部分的程序。例如，移动台的控制部存储于内存，可以由在处理器中动作的控制程序来实现，其它功能块也可以同样地实现。上述各种处理是以在一个处理器中执行为主旨来进行说明的，但可也可由两个以上的处理器同时或者依次执行。处理器可以通过一个以上的芯片实装。需要说明的是，程序可以经由通信电路从网络发送。
内存是计算机能够读取的记录介质，例如可以由ROM（ReadOnly Memory）、EPROM（ErasableProgrammable ROM）、EEPROM（Electrically Erasable Programmable ROM）、RAM（RandomAccessMemory）等至少一个来构成。内存可以称作寄存器、超高速缓冲存储器、主内存（主存储装置）等。内存能够保存用于实施本发明的一个实施方式的无线通信方法的可执行程序（程序代码）、软件模块等。
存储器是计算机可读取的记录介质，例如可以由CD-ROM（CompactDisc ROM）等光盘、硬盘驱动器、软磁盘、磁光盘(例如压缩光盘、数码多功能光盘、Blu-ray（注册商标）光盘)、智能卡、闪存(例如闪存卡、闪存棒、薄式闪存)、软盘（floppy disk注册商标）、磁条等至少一种构成。存储器可以称作辅助存储装置。上述存储介质可以是例如包括内存和/或存储器的数据库、服务器等其它合适的介质。
通信装置是经由有线及/或无线网络来进行计算机间的通信的硬件（收发信设备），例如也称作网络设备、网络控制器、网卡、通信模块等。例如，上述收发信天线、放大部、收发信部、传送路接口等可以由通信装置实现。
输入装置是接受来自外部的输入的输入设备（例如键盘、鼠标、话筒、开关、按钮、传感器等）。输出装置是实施向外部的输出的输出设备（例如显示器、扬声器、LED灯等）。需要说明的是，输入装置及输出装置可以是一体的结构（例如触摸屏）。
另外，处理器和内存等各装置由信息进行通信的总线连接。总线可以由单一的总线构成，也可以由装置间不同的总线构成。
另外，基站及移动台可以包括微处理器、数字信号处理器（DSP：Digital SignalProcessor）、ASIC（ApplicationSpecificIntegratedCircuit）、PLD（ProgrammableLogicDevice）、FPGA（FieldProgrammableGateArray）等硬件来进行构成，可以利用该硬件实现各功能块的一部分或者全部。例如，处理器可以通过至少一个所述硬件来实装。
在本说明书中说明的各方式/实施方式可以适用于LTE（LongTermEvolution）、LTE-A（LTE-Advanced）、SUPER 3G、IMT－Advanced、4G、5G、FRA（FutureRadioAccess）、W-CDMA（注册商标）、GSM（注册商标）、CDMA2000、UMB（UltraMobileBroadband）、IEEE 802.11（Wi-Fi）、IEEE 802.16（WiMAX）、IEEE 802.20、UWB（Ultra-WideBand）、Bluetooth（注册商标）、利用其它合适的系统的系统及/或基于这些而被扩展的下一代系统。
软件与称作软件、固件、中间件、微代码、硬件描述语言或称作其它名称无关，能够广泛地解释成指令、指令集、代码、代码段、程序代码、程序、子程序、软件模块、应用程序、软件应用程序、软件包、例行程序、子例行程序、对象、可执行文件、执行线程、步骤、功能等意思。
另外，软件、指令等可以经由传送介质来收发信。例如，软件在使用同轴线缆、光纤、双绞线及数字用户线路（DSL）等有线技术及/或红外线、无线及微波等无线技术从网页、服务器、或者其它远程数据源发送的情况下，这些有线技术及/或无线技术包含在传送介质的定义中。
“包含”、“含有”以及这些的变形只要在本说明书或者权利要求范围中使用，这些术语与术语“具备”同样地表示包括。此外，在本说明书或者权利要求范围中使用的术语“或者”表示不为异或。
因此，通过使用上述实施例详细解释了本发明；然而，本领域技术人员应清楚本发明不限于在理解释的实施例。本发明在不背离由权利要求限定的本发明的范围的情况下可以被实现为校正的、修改的模式。因此，说明书的描述仅意图解释示例，并且不对本发明施加任何限制含义。

Claims (12)

  1. 一种波束选择方法，所述方法由移动台执行，包括：
    从多个波束中选择一个主导波束；
    根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；
    根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
  2. 如权利要求1所述的方法，其中，所述从多个波束中选择一个主导波束包括：
    根据与所述多个波束相对应的信道状况选择一个主导波束。
  3. 如权利要求1所述的方法，其中，所述根据所选择的所述主导波束，从多个波束中选择一个组合波束包括：
    根据所述主导波束与所选择的组合波束组合后对应的信道状况选择所述组合波束。
  4. 如权利要求1所述的方法，其中，所述方法还包括：
    向基站反馈指示所述参考波束的信息，并基于所述信息向基站指示所选择的所述主导波束和所述组合波束相对于所述参考波束的位置。
  5. 一种波束选择方法，所述方法由移动台执行，包括：
    从多个波束中选择一个主导波束；
    根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。
  6. 如权利要求5所述的方法，其中，所述方法还包括：
    根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围。
  7. 如权利要求5所述的方法，其中，
    所述波束组中的波束横向间隔、纵向间隔或对角线相接。
  8. 如权利要求5所述的方法，其中，所述方法还包括：
    向基站指示所选择的所述主导波束和所述组合波束的信息。
  9. 一种波束选择方法，所述方法由基站执行，包括：
    从多个波束中选择一个主导波束；
    根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；
    根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同；
    利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
  10. 一种波束选择方法，所述方法由基站执行，包括：
    从多个波束中选择一个主导波束；
    根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻；
    利用所选择的所述主导波束和所述组合波束的组合向移动台发送信息。
  11. 一种移动台，包括：
    第一主导波束选择单元，配置为从多个波束中选择一个主导波束；
    第一组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且相邻；
    第一参考波束确定单元，配置为根据所述波束组确定相应的参考波束，其中，所述参考波束用于指示所述波束组的范围，且与所述主导波束不同。
  12. 一种移动台，包括：
    第三主导波束选择单元，配置为从多个波束中选择一个主导波束；
    第三组合波束选择单元，配置为根据所选择的所述主导波束，从多个波束中选择一个组合波束，所述主导波束和所述组合波束均位于一个波束组中，所述波束组中的波束彼此正交且不相邻。
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