WO2017177379A1 - 在毫米波通信系统中用于传输公共控制信号的方法及装置 - Google Patents

在毫米波通信系统中用于传输公共控制信号的方法及装置 Download PDF

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Publication number
WO2017177379A1
WO2017177379A1 PCT/CN2016/079081 CN2016079081W WO2017177379A1 WO 2017177379 A1 WO2017177379 A1 WO 2017177379A1 CN 2016079081 W CN2016079081 W CN 2016079081W WO 2017177379 A1 WO2017177379 A1 WO 2017177379A1
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Prior art keywords
common control
codebook
beamforming
control signal
precoded
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PCT/CN2016/079081
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English (en)
French (fr)
Inventor
孙芳蕾
孙欢
杨涛
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上海贝尔股份有限公司
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Application filed by 上海贝尔股份有限公司 filed Critical 上海贝尔股份有限公司
Priority to JP2018553963A priority Critical patent/JP2019518362A/ja
Priority to KR1020187032725A priority patent/KR20180132866A/ko
Priority to CN201680084070.7A priority patent/CN108925142B/zh
Priority to US16/092,608 priority patent/US20190132029A1/en
Priority to EP16898198.3A priority patent/EP3444956A4/en
Priority to PCT/CN2016/079081 priority patent/WO2017177379A1/zh
Publication of WO2017177379A1 publication Critical patent/WO2017177379A1/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
    • H04B7/0408—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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0482—Adaptive codebooks
    • 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
    • H04B7/0617—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 for beam forming
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—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 spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H04L5/0025—Spatial division following the spatial signature of the channel

Definitions

  • Embodiments of the present disclosure relate to mobile communication technologies, and more particularly to a method and apparatus for transmitting a common control signal in a base station of a millimeter wave communication system.
  • the 5G physical layer is dedicated to delivering high performance data rates as well as reduced cost and power consumption.
  • one option is to increase the available bandwidth on the millimeter wave frequency.
  • the wireless channel When operating on millimeter wave frequencies, the wireless channel has some poor transmission quality, including strong path loss, atmospheric and rainwater absorption, low diffraction around obstacles, and low penetration for objects.
  • the transmission of the common downlink control channel and the broadcast channel (for example, PSS/SSS/PBCH/PDCCH (CSS)) of millimeter wave communication is mainly based on a non-precoded transmission scheme or a diversity scheme.
  • the transmission scheme using the LTE control channel may not satisfy the SINR and coverage requirements in the millimeter wave communication system.
  • transmission of beamforming of downlink synchronization/broadcast/control signaling will be considered.
  • CRS cell-specific reference-cell reference
  • embodiments of the present disclosure provide a method and apparatus for transmitting a common control signal in a base station of a millimeter wave communication system.
  • a method for transmitting a common control signal in a base station of a millimeter wave communication system comprising: configuring a first beamforming codebook; using the first beamforming codebook Beamforming the codewords to precode a plurality of identical common control signals respectively; and spatially multiplexing, using the plurality of beams to respectively transmit a plurality of precoded to respective beam coverage areas in the cell Common control signal.
  • a method for transmitting a common control signal in a base station of a millimeter wave communication system comprising: configuring a beamforming codebook; and using each beamforming code in the beamforming codebook a word to separately precode the common control signal; and for each precoded common control signal, sequentially scanning the entire cell in a single beam to transmit the precoded common control signal, wherein A single beam carries a precoded common control signal
  • a method for transmitting a common control signal in a base station of a millimeter wave communication system comprising: configuring a beamforming codebook; and using a beamforming codeword in the beamforming codebook To separately pre-code a plurality of identical common control signals; and spatially multiplex a single beam in each region of the cell to simultaneously scan each region, and in each of the regions The entire region is sequentially scanned in different individual beams to transmit a plurality of precoded common control signals, wherein the single beam carries a precoded common control signal.
  • an apparatus for transmitting a common control signal in a base station of a millimeter wave communication system comprising: a configuration unit configured to configure a first beamforming codebook; and a precoding unit And for using the beamforming codewords in the first beamforming codebook to pre-process multiple identical common control signals respectively And a transmitting unit, configured to transmit, by using a plurality of beams, a plurality of precoded common control signals to respective ones of the cells in a space division multiplexing manner.
  • the precoding unit is further configured to use the beamformed codewords to precode the reference signal sequences of the common control signals, respectively, to generate a plurality of different reference signal sequences respectively carried by the plurality of beams.
  • the transmitting unit is further configured to transmit the plurality of beams to respective beam coverage areas in the cell in a spatial division multiplexing manner.
  • the apparatus further includes a power enhancement unit for increasing a transmit power of the plurality of precoded common control signals using at least one subcarrier transmitting at least one OFDM symbol of the plurality of precoded common control signals, wherein At least one subcarrier is not used to transmit a plurality of precoded common control signals.
  • the configuration unit is further configured to configure at least one second beamforming codebook, the second beamforming codebook being different from the first beamforming codebook; using the beamforming codeword in the at least one second beamforming codebook Separating a plurality of identical common control signals, respectively, and transmitting, by means of spatial multiplexing, a plurality of common controls for precoding of at least one second beamforming codebook to respective regions in the cell A signal, wherein an area transmitted by the common control signal precoded by the at least one second beamforming codebook is beam shifted with respect to an area transmitted by the common control signal precoded by the first beamforming codebook.
  • the transmitting unit is further configured to transmit, in a space division multiplexing manner, a plurality of common control signals precoded by the first beamforming codebook to the respective regions in the cell in a predetermined order by using a plurality of beams. And a plurality of common control signals precoded by the at least one second beamforming codebook.
  • the sending unit is further configured to send configuration information to the user equipment, the configuration information comprising: a codebook size of the first beamforming codebook and/or information related to beam shifting.
  • an apparatus for transmitting a common control signal in a base station of a millimeter wave communication system comprising: a configuration unit configured to configure a beamforming codebook; and a precoding unit In the use of the beamforming codebook Each beamforming codeword to separately precode the common control signal; and a scanning unit, for each precoded common control signal, sequentially scanning the entire cell in a single beam to transmit the pre-predicted An encoded common control signal, wherein the single beam carries a precoded common control signal.
  • the apparatus further includes a sending unit, configured to send configuration information to the user equipment, where the configuration information includes: a period in which the single beam scans the entire cell, a duration of transmitting the common control signal, and at least a codebook size of the beamforming codebook.
  • a sending unit configured to send configuration information to the user equipment, where the configuration information includes: a period in which the single beam scans the entire cell, a duration of transmitting the common control signal, and at least a codebook size of the beamforming codebook.
  • the precoding unit is further configured to precode the reference signal sequence of the common control signal using respective beamforming codewords in the beamforming codebook to generate a plurality of different precoded reference signal sequences.
  • the scanning unit is further configured to, for each precoded reference signal sequence, sequentially scan the entire cell in a single beam, wherein the single beam carries a precoded reference signal sequence.
  • an apparatus for transmitting a common control signal in a base station of a millimeter wave communication system comprising: a configuration unit configured to configure a beamforming codebook; and a precoding unit Using a beamforming codeword in the beamforming codebook to separately precode a plurality of identical common control signals; and a scanning unit for spatially multiplexing multiplexing in each region of the cell Separately scanning each region using a single beam, and sequentially scanning the entire region with different individual beams in each of the regions to transmit a plurality of precoded common control signals, wherein the single beam carries one Precoded common control signals.
  • the configuration unit is further configured to determine the beamforming codebook by means of the area codebook and the beam scanning codebook, wherein the area codebook includes N Sector codewords respectively indicating different areas in the cell, and the beam scanning codebook includes N beam codewords that indicate the beamforming codewords available in an area.
  • the configuration unit is further configured to determine the beamforming codebook by finding a matrix Cronoke product for the region codebook and the beam scanning codebook.
  • the precoding unit is further configured to use the beamforming codeword to precode the reference signal sequence of the common control signal separately to generate a plurality of different pre-coded The reference signal sequence of the code.
  • the scanning unit is further configured to separately scan each region in a spatially multiplexed manner using a single beam in each region of the cell, and sequentially scan the entire region with different single beams in each region. And transmitting a plurality of different precoded reference signal sequences, wherein a single beam carries a precoded reference signal sequence.
  • beamforming transmission for synchronization/broadcast/control signaling can withstand strong path loss in millimeter wave communication. This will effectively ensure UE access and accurate updating of system information at a later time.
  • the same transmission is transmitted simultaneously or one by one on all the beams. Signaling without CSI feedback. Therefore, the corresponding signaling processing, as well as the precoding and resource mapping of the embedded reference signal sequence will be different.
  • FIG. 1 shows a flow diagram of a method 100 for transmitting a common control signal in accordance with one embodiment of the present disclosure
  • FIG. 2 shows a schematic diagram for transmitting a common control signal in accordance with one embodiment of the present disclosure
  • FIG. 3 illustrates a flow diagram of a method 200 for transmitting a common control signal in accordance with another embodiment of the present disclosure
  • FIG. 4 shows a schematic diagram for transmitting a common control signal in accordance with another embodiment of the present disclosure
  • FIG. 5 illustrates a flow diagram of a method 300 for transmitting a common control signal in accordance with yet another embodiment of the present disclosure
  • FIG. 6 shows a schematic diagram for transmitting a common control signal in accordance with yet another embodiment of the present disclosure
  • Figure 7 shows a schematic diagram of an apparatus for transmitting a common control signal in accordance with one embodiment of the present disclosure
  • FIG. 8 illustrates a schematic diagram of an apparatus for transmitting a common control signal in accordance with another embodiment of the present disclosure
  • FIG. 9 shows a schematic diagram of an apparatus for transmitting a common control signal in accordance with yet another embodiment of the present disclosure.
  • common control signals include, but are not limited to, common downlink synchronization/broadcast/control signaling, and one or more narrowbands are allocated for common control signals. Since the number of signalings included in these common channels is limited, it is reasonable to allocate narrowbands.
  • power enhancement may also be used in alternative embodiments of the present disclosure to pass other resource elements from the same OFDM symbol.
  • the resource element (RE)/subcarrier is seconded to further increase the strength of the control signaling.
  • These RE/subcarriers do not have RE/subcarriers for transmitting common control signals, and may be, for example, idle and/or low energy requirements, although not idle.
  • these subcarriers are used for data transmission, and the data can be transmitted in other enhanced ways, so that some power can be split for transmission to the control channel.
  • transmission periods and resource allocations of different common control signals are configurable and/or pre-definable prior to UE access. of. For example, it can be pre-configured on both the eNB and the UE side.
  • common control signals eg, synchronization signaling and master information block (MIB)
  • MIB master information block
  • the corresponding reference signal sequence of the common control signal is embedded with the same beamforming weight (also referred to as beamforming codeword) as the transmission for the common control signal. Since the beam is used to transmit the common control signals of all UEs, no CSI is needed for the common control signal. This is in contrast to the key to beamformed UE-specific control signaling, in which the CSI feedback for multiple beams is required to further select beam or adjust the beamforming of the signaling. Therefore, the design and resource allocation of the reference signal sequence will be different from the beamformed UE specific control signal or proprietary data. Specifically, in one embodiment of the present disclosure, information of resource allocation of reference signal sequences of different cells will be known to the UE before detecting, for example, broadcast and control channels, for example, by means of cell identification. It is implicitly indicated to the UE.
  • FIG. 1 illustrates a flow diagram of a method 100 for transmitting a common control signal in accordance with one embodiment of the present disclosure.
  • step S102 the base station configures a first beamforming codebook.
  • step S103 the base station uses the beamforming codewords in the first beamforming codebook to precode a plurality of identical common control signals, respectively.
  • step S105 the base station uses a plurality of beams to transmit a plurality of precoded common control signals to respective beam coverage areas in the cell in a spatial division multiplexing manner.
  • the method before transmitting the common control signal, the method further includes the step S101: the base station uses the beamforming codeword to separately precode the reference signal sequence of the common control signal to generate multiple carriers respectively carried by the multiple beams. Different reference signal sequences. Then, the base station separately transmits multiple beams to corresponding beam coverage areas in the cell in a space division multiplexing manner.
  • the UE can utilize the received reference signal sequence to perform channel estimation and demodulation on subsequent common control signals.
  • the method further includes the step S104: the base station uses the at least one subcarrier that transmits the OFDM symbols of the plurality of precoded common control signals to add a plurality of precoded commons.
  • the transmit power of the control signal wherein at least one of the subcarriers is not used to transmit a plurality of precoded common control signals.
  • the method further includes a step S106, in which the base station configures at least one second beamforming codebook, which is different from the first beamforming codebook, respectively. Further, the base station uses at least one beamforming codeword in the second beamforming codebook to precode a plurality of identical common control signals, respectively. And the base station sends, by means of space division multiplexing, a plurality of common control signals precoded by the at least one second beamforming codebook to the corresponding beam coverage areas in the cell, where at least one second The beam coverage area transmitted by the beamforming codebook precoded common control signal is beam shifted relative to the beam coverage area transmitted by the common control signal precoded by the first beamforming codebook. In this embodiment, the base station can adjust the transmission angle of the beam to cover the user equipment that was not previously covered.
  • the base station transmits a plurality of first beamformed codebook precodes in a predetermined order using a plurality of beams to respective beam coverage areas in the cell in a space division multiplexing manner.
  • the transmission can be performed, for example, cyclically and alternately.
  • the method further includes: the base station transmitting configuration information to the user equipment, including: a codebook size of the first beamforming codebook and/or information related to beam shifting. It should be noted that this step is not required.
  • the same common control signal (synchronization/broadcast/control signaling) precoded by different beamforming codewords (also referred to as beamforming weights) is transmitted over multiple beams in a spatially multiplexed mode, In order for UEs covered by different areas/sectors to receive the same common control signal at the same time.
  • the contents of the common control signals transmitted by different beams are the same, but beamforming for each common control signal
  • the weights are different so that the pre-coded common control signals will form spatial multiplexing.
  • the transmission power will be allocated on different beams.
  • the number of beams supported by the power limit can be estimated to satisfy the minimum received SINR at the cell edge.
  • the spatially multiplexed beam vector is applied in the same manner as the beam vector (also referred to as beamforming weight/codeword) applied to the common control signal.
  • a reference signal sequence encoding a common control signal is embedded into the transmitted resource block for channel estimation and demodulation.
  • an identical reference signal sequence, after weighting different codewords, will form different reference signal sequences over multiple beams.
  • the precoding and mapping of the reference signal sequence will be completely different from the transmission for beamforming of UE specific control signaling or dedicated data.
  • a beamformed UE-specific control signaling scheme one beamformed port should be mapped onto a specific set of resource elements rather than shared resources.
  • the beamformed reference signal sequences of the multiple beams should be spatially multiplexed on the same resource element for further decoding, as shown in FIG. This setup will significantly reduce the load on the transmission of the reference signal sequence.
  • the problem of insufficient coverage may occur over the area between adjacent beams.
  • FIG. 2 shows a scheme 1 with 2 beam shifts.
  • UE 0 is located in the coverage hole between two adjacent beams.
  • time slot t+1 all the beams formed in the time slot t are shifted by the angle ⁇ .
  • N is the number of beams, then UE0 can be covered and the common sync/broadcast/control signal is saved.
  • ⁇ 1, ⁇ 2, . . . ⁇ n may be offset from the original respective beams.
  • the plurality of different beams described above may be transmitted in a predetermined order. For example, it is sent cyclically over time. That is, in the time slot t, the first beam is transmitted; in the time slot t+1, the beam transmitting the beam offset ⁇ 1... transmits the beam of the beam offset ⁇ n in the time slot t+n. At the end, it returns to the original beam for transmission.
  • other flexible transmission methods can also be adopted here, such as alternately transmitting the plurality of offset beams.
  • the UE is transparent and does not require CSI feedback.
  • the eNB may inform the UE in a suitable manner (dominantly/recessively) of the time/period, codebook size and/or beam shift associated with detecting the beamforming common control signal. Information (such as the specific pattern of beam shifts, in which order, etc.). It should be understood that the various types of information described above are not required and are only sent when needed.
  • the diversity gain can be achieved by simultaneously receiving signals from the two beams.
  • the specific implementation process of the above solution will be explained with continued reference to FIG. 2.
  • the common control signal will be precoded, for example, using a beamforming codebook comprising 8 beamforming codewords/weights, and transmitted in a spatially multiplexed manner.
  • 8 data streams are superimposed and transmitted on corresponding time-frequency resources.
  • eight beamforming codewords/weights can be presented in the form of a spatially multiplexed beamforming matrix.
  • Equation 1 For ease of explanation, one embodiment of the present disclosure will be explained below by means of Equation 1. However, it should be understood that the following formula does not limit the scope of the disclosure, but is merely a codebook design criterion. Those skilled in the art will appreciate that other codebook design criteria can also be used.
  • y1....y8 is a common control signal received by the UE and carried by each beam.
  • S1...S8 are common control signals of the same content.
  • H is a channel matrix.
  • eight beams, as shown in Figure 2 will be generated that point to and cover different regions (or sectors).
  • beam 1 can be represented as h 1 w 1 s 1
  • beam 2 can be represented as h 2 w 2 s 2 .
  • the beam of the reference signal sequence carrying the common control signal may be transmitted with the same beamforming codeword/weight w 1 ... w 8 . That is, the same precoding method as the common control signal is applied to the reference signal sequence.
  • the UE can perform channel estimation and demodulate the subsequent common control signals.
  • the above reference signal sequence may be embedded in an area of a physical resource block for transmitting respective common control signals and spatially multiplexed on the same resource element to further save resource overhead.
  • a beam shifting method can be employed to solve the above problem. For example, forming a codeword / weights w 1 ... w 8 by adjusting the beam to all previous beam shift angle ⁇ . Alternatively, this can also be achieved, for example, by configuring another beamforming codebook (ie, using another spatially multiplexed beamforming matrix). After all beam shift angles ⁇ , UE0 can be covered and saves common sync/broadcast/control signals.
  • the direction of the beam may be alternately or cyclically changed in time, that is, the base station may alternately or cyclically transmit via the first spatial multiplexing beamforming matrix and the second spatial multiplexing beam Forming matrix precoded common control signals.
  • description is made only with two spatially multiplexed beamforming matrices, it being understood that the above idea can be extended to a plurality of spatially multiplexed beamforming matrices.
  • FIG. 3 illustrates a flow diagram of a method 200 for transmitting a common control signal in accordance with another embodiment of the present disclosure.
  • step S202 the base station configures a beamforming codebook.
  • step S203 the base station uses the respective beamforming codewords in the beamforming codebook to precode the common control signals, respectively.
  • step S204 for each precoded common control signal, the base station sequentially scans the entire cell in a single beam to transmit a precoded common control signal, wherein the single beam carries a precoded common control. signal.
  • the method further includes the step S201: the base station uses each beamforming codeword in the beamforming codebook to separately precode the reference signal sequence of the common control signal to generate multiple Different precoded reference signal sequences. And, for each precoded reference signal sequence, the base station sequentially scans the entire cell in a single beam, wherein the single beam carries a precoded reference signal sequence.
  • the UE can utilize the received reference signal sequence to perform channel estimation and demodulation on subsequent common control signals.
  • the method further includes: the base station transmitting configuration information to the user equipment, where: the period in which the single beam scans the entire cell, the duration of transmitting the common control signal, and the codebook size of the beamforming codebook At least one of them. It should be noted that the above configuration information does not have to be sent.
  • the beam is scanned over the entire cell at the base station (eNB) side, which has the same common control signal. Furthermore, the reference signal sequence of the common control signal is precoded with the same beamforming vector (i.e., beamforming weight/codeword) as the precoded common control signal and embedded into the resource block.
  • the same beamforming vector i.e., beamforming weight/codeword
  • the signals received on the beam directed to it are the strongest, while the signals received on the other beams are so weak that these signals cannot be successfully decoded.
  • beam scanning is performed on the entire cell
  • the time is represented as a valid update period, ie N time slots, where N is the number of beams. For example, in one time slot, one beam is scanned in the entire cell. And, optionally, one public control signal is scanned during one valid update period and another public control signal is scanned during the next valid update period.
  • the scheme can be implemented in combination with other robust schemes, such as high redundancy, low modulation and coding. This makes it possible to alleviate the time burden caused by beam searching with a smaller number of beams.
  • Figure 4 shows a schematic diagram of Scheme 2, with a central narrowband resource region assigned to the beamforming common control signal (synchronization/broadcast/control signaling).
  • common control signals of the same content are separately precoded by different beamforming weights of beam 1 to beam N to generate N precoded common control signals.
  • N precoded common control signals are then transmitted on different time slots 1 through N, respectively. That is, in this scheme, common control signals of the same content pre-coded by different beamforming weights are scanned one by one.
  • the weight of beamforming is predefined on the eNB side as a codebook to cover the entire cell with beam scanning, after a valid update period (N time slots), one UE in the cell can be at the beam that points the most A common control signal for strong beamforming is received.
  • a DFT-based codebook in order to determine a wavelength shaping vector, for example, as used in an LTE/LTE-A codebook design, a DFT-based codebook can be considered.
  • N Tx is the number of transmit antennas and N is the number of beam/antenna ports.
  • the codebook in the scope of the present disclosure may follow any suitable codebook of LTE/LTE-A, and the above examples do not exclude the use of other codebooks.
  • the codebook selection is also substantially transparent to the UE and does not require any CSI feedback.
  • the same common control signal is transmitted on different beams over different time slots.
  • the UE will attempt to receive the common control signal on each time slot during the active update period and implement the corresponding flow after successfully receiving on a certain beam (e.g., above a predetermined SINR threshold corresponding to the beam). In the process, The UE does not need to know the details of the beam.
  • the base station may further send configuration information to the UE, where the configuration information includes: a period in which the single beam scans the entire cell, a duration in which the common control signal is transmitted (that is, the foregoing effective update period), and/or Codebook size.
  • the UE can detect the required common control signal according to the above configuration information.
  • the above configuration information is not required and is only sent when needed.
  • the beamforming codeword/weight with the same beamforming codeword/weight for the common control signal may be used.
  • the reference signal sequence is weighted to sequentially scan the entire cell in a single beam.
  • each single beam carries a precoded reference signal sequence. That is, the same precoding method as the common control signal is applied to the reference signal sequence.
  • the UE can perform channel estimation and demodulate the subsequent common control signals.
  • the transmission delay of scheme 2 is slightly larger and there is no power sharing for all beams.
  • power enhancement and beam shifting in the scheme 1 can also be used.
  • the aforementioned beamforming codewords can be adjusted to scan the beams at narrower angular intervals to cover all cell regions. Beamwidth adjustment can be achieved by adjusting the antenna configuration and codebook selection.
  • FIG. 5 illustrates a flow diagram of a method 300 for transmitting a common control signal in accordance with yet another embodiment of the present disclosure.
  • step S302 the base station configures a beamforming codebook.
  • step S303 the base station uses the beamforming codewords in the beamforming codebook to precode a plurality of identical common control signals, respectively.
  • step S304 the base station separately scans each area in a space division multiplexing manner using a single beam in each area of the cell, and sequentially scans the entire whole in a different single beam in each area.
  • the method before transmitting the common control signal, the method further includes step S301, in which the base station further uses each beamforming codeword in the beamforming codebook to refer to the common control signal respectively.
  • the signal sequence is precoded to produce a plurality of different precoded reference signal sequences.
  • the base station sequentially scans the entire cell with a single beam for each precoded reference signal sequence, wherein a single beam carries a precoded reference signal sequence.
  • the UE can utilize the received reference signal sequence to perform channel estimation and demodulation on subsequent common control signals.
  • configuring the beamforming codebook further comprises: the base station determining the beamforming codebook by means of the area codebook and the beam scanning codebook, wherein the area codebook includes N Sector codewords, respectively indicating the cell In different regions, the beam scan codebook includes N beam codewords that indicate the beamforming codewords available in a region.
  • the base station may determine the beamforming codebook by finding a matrix Cronoke product for the area codebook and the beam scanning codebook.
  • the entire cell is divided into different regions/sectors by spatial multiplexing in the transmission process, and beam searching in the similar scheme 2 is further implemented in each sector. For all sectors, beam searching within the sector can be performed simultaneously. This scheme can trade off between search time and power allocation. Similarly, the reference signal sequence and the common control signal are precoded with the same beamforming vector.
  • N 16 beams
  • the cell is first divided into 4 sectors and 4 beams are simultaneously scanned on 4 sectors.
  • 4 beams are scanned one by one in each sector.
  • These 16 beams all carry the same common control signal, however these common control signals are precoded by different beamforming vectors to form the aforementioned transmission.
  • each of the aforementioned scans is performed simultaneously. From the perspective of the eNB on the time slot, four beams having the same common control signal are simultaneously scanned on one time slot. Here, four data streams are superimposed on the corresponding time-frequency resources for transmission.
  • Option 3 is a balanced solution that can mitigate power loss relative to scenario 1. And increase the time efficiency relative to option 2.
  • the beam search pattern can be optimized by a search sequence, such as a binary search.
  • the beamforming codebook includes a region/sector codebook and a beam scan codebook.
  • the sector codebook is represented as The region codebook includes N Sector codewords that indicate different regions/sectors in the cell, respectively. Express the beam scan codebook as It indicates the beamforming codeword available in one area.
  • the beamforming codebook can be determined by means of the above two codebooks.
  • the beamforming codebook is determined by multiplying the two codebooks described above.
  • other suitable methods can also be used.
  • a precoder that is, a beamforming codebook, that is, a W matrix in Equation 1
  • a beamforming codebook that is, a W matrix in Equation 1
  • the sector and beam scan sequences can be separated and flexibly combined, which will speed up signaling.
  • the UE can ignore the detailed scanning mode/configuration because the UE only cares about the beam scanning transmission directed to it and obtains the best reception quality.
  • the reference signal sequence four beams are also transmitted in a spatially multiplexed manner in one time slot.
  • the reference signal sequence can also be precoded by the same beam weights for the common control signals and transmitted in the same spatial multiplexing manner.
  • the UE can perform channel estimation and demodulate the subsequent common control signals.
  • power enhancement and beam shifting in scheme 1 can also be used in combination in scheme 3.
  • the UE can still be transparent to the codebook selection and does not require CSI anti- Feed.
  • the eNB may further send configuration information to the UE, where the configuration information includes: a period in which the single beam scans the entire area and/or a duration in which the common control signal is transmitted (that is, the foregoing effective update period). Thereby, the UE can detect the required common control signal according to the above configuration information.
  • FIG. 7 shows a schematic diagram of an apparatus for transmitting a common control signal in accordance with one embodiment of the present disclosure.
  • the apparatus 10 includes a configuration unit 101, a precoding unit 102, and a transmitting unit 103.
  • the configuration unit 101 is configured to configure a first beamforming codebook.
  • the precoding unit 102 is configured to separately precode a plurality of the same common control signals by using the beamforming codewords in the first beamforming codebook.
  • the sending unit 103 is configured to use a plurality of beams to transmit a plurality of precoded common control signals to respective ones of the cells in a space division multiplexing manner.
  • precoding unit 102 is further configured to use beamforming codewords to precode the reference signal sequences of the common control signals, respectively, to generate a plurality of different reference signal sequences respectively carried by the plurality of beams.
  • the transmitting unit 103 is further configured to separately transmit the plurality of beams to respective regions in the cell in a space division multiplexing manner.
  • the apparatus 10 further includes a power enhancement unit for increasing a transmission power of the plurality of precoded common control signals using at least one subcarrier of the OFDM symbol transmitting the plurality of precoded common control signals, wherein at least One subcarrier is not used to transmit multiple precoded common control signals.
  • the configuration unit 101 is further configured to configure at least one second beamforming codebook, the second beamforming codebook being different from the first beamforming codebook; using the beamforming codeword in the at least one second beamforming codebook, Separating a plurality of identical common control signals, respectively, in a space division multiplexing manner, using a plurality of beams to respectively transmit a plurality of commons of at least one second beamforming codebook precoding to respective ones of the cells And a control signal, wherein an area transmitted by the common control signal precoded by the at least one second beamforming codebook is beam shifted with respect to an area transmitted by the common control signal precoded by the first beamforming codebook.
  • the transmitting unit 103 is further configured to transmit a plurality of common control of the first beamforming codebook precoding in a predetermined order to the corresponding one of the cells in a space division multiplexing manner. And a plurality of common control signals precoded by the at least one second beamformed codebook.
  • the sending unit 103 is further configured to send configuration information to the user equipment, where the configuration information comprises: a codebook size of the first beamforming codebook and/or information related to beam shifting.
  • FIG. 8 shows a schematic diagram of an apparatus for transmitting a common control signal in accordance with another embodiment of the present disclosure.
  • the device 20 includes a configuration unit 201, a precoding unit 202, and a scanning unit 203.
  • the configuration unit 201 is configured to configure a beamforming codebook.
  • the precoding unit 202 is configured to separately precode the common control signal by using each beamforming codeword in the beamforming codebook.
  • the scanning unit 203 is configured to sequentially scan the entire cell in a single beam for each precoded common control signal to transmit the precoded common control signal, where the single beam carries a precoded common control signal.
  • the apparatus 20 further includes a sending unit, configured to send configuration information to the user equipment, where the configuration information includes: a period in which the single beam scans the entire cell, a duration in which the common control signal is transmitted, and a codebook size of the beamforming codebook. at least one.
  • the precoding unit 202 is further configured to precode the reference signal sequence of the common control signal using respective beamforming codewords in the beamforming codebook to generate a plurality of different precoded reference signal sequences. .
  • the scanning unit 203 is further configured to sequentially scan the entire cell in a single beam for each precoded reference signal sequence, wherein the single beam carries a precoded reference signal sequence.
  • FIG. 9 shows a schematic diagram of an apparatus for transmitting a common control signal in accordance with yet another embodiment of the present disclosure.
  • the apparatus 30 includes a configuration unit 301, a precoding unit 302, and a scanning unit 303.
  • the configuration unit 301 is configured to configure a beamforming codebook.
  • the precoding unit 302 is configured to separately precode a plurality of identical common control signals by using beamforming codewords in the beamforming codebook.
  • the scanning unit 303 is configured to separately scan each area in a space division multiplexing manner using a single beam in each area of the cell, and sequentially scan the entire area in different areas with different single beams in each area. To transmit a plurality of precoded common control signals, wherein a single beam carries a precoded common control signal.
  • the configuration unit 301 is further configured to determine a beamforming codebook by means of an area codebook and a beam scanning codebook, wherein the area codebook includes N Sector codewords, respectively indicating different areas in the cell, and the beam scanning codebook N beam codewords are included that indicate the beamforming codewords available in a region.
  • the configuration unit 301 is further configured to determine the beamforming codebook by multiplying the area codebook with the beam scanning codebook.
  • the precoding unit 302 is further configured to use the beamformed codewords to precode the reference signal sequences of the common control signals, respectively, to generate a plurality of different precoded reference signal sequences.
  • the scanning unit 303 is further configured to separately scan each region in a spatially multiplexed manner using a single beam in each region of the cell, and sequentially scan the entire one with a different single beam in each region.

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Abstract

本公开的实施例提供了一种在毫米波通信系统中用于传输公共控制信号的方法及装置。在本公开的一个实施例中，该方法包括：配置第一波束成形码本；使用所述第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及以空分复用的方式，使用多个波束来分别向小区中的相应的波束覆盖区域发送多个经预编码的公共控制信号。通过本公开的实施例，用于同步/广播/控制信令的波束成形的传输能够抵御毫米波通信中的强的路径损耗。由此将有效地确保用户设备的接入以及稍后系统信息的精确的更新。

Description

在毫米波通信系统中用于传输公共控制信号的方法及装置 技术领域
本公开的实施例涉及移动通信技术，尤其涉及一种在毫米波通信系统的基站中用于传输公共控制信号的方法及装置。
背景技术
5G物理层致力于提供高性能的数据率以及降低的成本和功率消耗。为了满足移动蜂窝网通信标准的下一代的每秒千兆的数据率，一个选项是增加毫米波频率上的可用的带宽。在毫米波频率上运作时，无线信道具有一些不良的传输质量，包括较强的路径损失、大气和雨水吸收、障碍物周围的低衍射和对于物体的低的穿透性。
为了克服毫米波通信系统中的这些不良的传输质量，大的阵列和窄的波束将是数据传输的关键技术。然而，毫米波通信的公共下行控制信道和广播信道(例如，PSS/SSS/PBCH/PDCCH(CSS))的传输主要基于非预编码的传输方案或分集方案。而对于毫米波通信而言，由于毫米波信道的上述特性，仍使用LTE控制信道的传输方案可能不满足毫米波通信系统中的SINR和覆盖要求。
因此，在本公开的实施例中，将考虑下行同步/广播/控制信令的波束成形的传输。由于在同步或初始接入阶段期间，用户设备(user equipment，UE)没有任何UE特定的波束成形信息和小区特定的参考信号序列(cell-specific reference signal，CRS)配置，因此UE特定的波束成形传输是不可能的。从而，在此将考虑基于预定的码本的小区特定的波束成形的传输方案。
迄今为止，并没有对公共同步/PBCH/PDCCH的波束成形的传输进行过详细的讨论。对于先前讨论的用于UE特定的控制信道的波束扫描或GoB赋形，主要目标在于通过强制的信道状态信息(channel state information，CSI)反馈来实施波束选择，而CSI将被进一步用于UE特定数据/控制信道的预编码。然而，该概念不能够用于下行 公共控制信道传输。
发明内容
针对现有技术中存在的技术问题，本公开的实施例提供了一种在毫米波通信系统的基站中用于传输公共控制信号的方法及装置。
根据本公开的第一方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：配置第一波束成形码本；使用所述第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及以空分复用的方式，使用多个波束来分别向小区中的相应的波束覆盖区域发送多个经预编码的公共控制信号。
根据本公开的第二方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：配置波束成形码本；使用所述波束成形码本中的各个波束成形码字，来分别对所述公共控制信号进行预编码；以及对于每个经预编码的公共控制信号，分别以单个波束来依次扫描整个小区以传输所述经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号
根据本公开的第三方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：配置波束成形码本；使用所述波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在所述每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
根据本公开的第四方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：配置单元，用于配置第一波束成形码本；预编码单元，用于使用所述第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预 编码；以及发送单元，用于以空分复用的方式，使用多个波束来分别向小区中的相应的区域发送多个经预编码的公共控制信号。
此外，预编码单元还被配置为使用波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生由多个波束分别承载的多个不同的参考信号序列。
发送单元还被配置为以空分复用的方式，将多个波束分别发送至小区中的相应的波束覆盖区域。
此外，装置还包括功率增强单元，其用于利用发送多个经预编码的公共控制信号的至少一个OFDM符号的至少一个子载波，来增加多个经预编码的公共控制信号的发送功率，其中至少一个子载波未用于发送多个经预编码的公共控制信号。
优选地，配置单元还用于配置至少一个第二波束成形码本，第二波束成形码本与第一波束成形码本不同；使用至少一个第二波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以空分复用的方式，使用多个波束分别向小区中的相应的区域发送多个经至少一个第二波束成形码本预编码的公共控制信号，其中以至少一个第二波束成形码本预编码的公共控制信号发送的区域相对于以第一波束成形码本预编码的公共控制信号发送的区域发生波束移位。
优选地，发送单元还被配置为以空分复用的方式，使用多个波束分别向小区中的相应的区域、以预定顺序地发送多个经第一波束成形码本预编码的公共控制信号和多个经至少一个第二波束成形码本预编码的公共控制信号。
优选地，发送单元还被配置为向用户设备发送配置信息，配置信息包括：第一波束成形码本的码本尺寸和/或与波束移位相关的信息。
根据本公开的第五方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：配置单元，用于配置波束成形码本；预编码单元，用于使用所述波束成形码本中的 各个波束成形码字，来分别对所述公共控制信号进行预编码；以及扫描单元，用于对于每个经预编码的公共控制信号，分别以单个波束来依次扫描整个小区以传输所述经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
优选地，装置还包括发送单元，其用于向用户设备发送配置信息，配置信息包括：单个波束扫描整个小区的周期、传输公共控制信号的持续周期以及波束成形码本的码本尺寸中的至少一个。
预编码单元还被配置为用于使用波束成形码本中的各个波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列。
扫描单元还被配置为用于对于每个经预编码的参考信号序列，分别以单个波束来依次扫描整个小区，其中单个波束承载一个经预编码的参考信号序列。
根据本公开的第六方面，提出了一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：配置单元，用于配置波束成形码本；预编码单元，用于使用所述波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及扫描单元，用于以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在所述每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
在此，配置单元进一步配置为借助于区域码本与波束扫描码本来确定波束成形码本，其中，区域码本包括NSector个码字，其分别指示小区中的不同区域，波束扫描码本包括Nbeam个码字，其指示一个区域中可用的波束成形码字。
优选地，配置单元进一步配置为通过对区域码本与波束扫描码本求矩阵克罗内克积的方式来确定波束成形码本。
预编码单元还被进一步配置为使用波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编 码的参考信号序列。
扫描单元还被进一步配置为以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个不同的经预编码的参考信号序列，其中单个波束承载一个经预编码的参考信号序列。
通过本公开的实施例，用于同步/广播/控制信令的波束成形的传输能够抵御毫米波通信中的强的路径损耗。由此将有效地确保UE接入以及稍后系统信息的精确的更新。与背景技术中的UE特定的控制信道的波束扫描不同的是：在本公开的实施例中对于下行公开同步/广播/控制信令，在所有的波束上同时或一个接一个地扫描地传输相同的信令，而不再需要CSI反馈。因此，相应的信令处理、以及嵌入的参考信号序列的预编码和资源映射将不同。
本公开的各个方面将通过下文中的具体实施例的说明而更加清晰。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本公开的其它特征、目的和优点将会变得更加明显：
图1示出了根据本公开的一个实施例的用于传输公共控制信号的方法100的流程图；
图2示出了根据本公开的一个实施例的用于传输公共控制信号的示意图；
图3示出了根据本公开的另一个实施例的用于传输公共控制信号的方法200的流程图；
图4示出了根据本公开的另一个实施例的用于传输公共控制信号的示意图；
图5示出了根据本公开的又一个实施例的用于传输公共控制信号的方法300的流程图；
图6示出了根据本公开的又一个实施例的用于传输公共控制信号的示意图；
图7示出了根据本公开的一个实施例的用于传输公共控制信号的装置示意图；
图8示出了根据本公开的另一个实施例的用于传输公共控制信号的装置示意图；以及
图9示出了根据本公开的又一个实施例的用于传输公共控制信号的装置示意图。
在图中，贯穿不同的示图，相同或类似的附图标记表示相同或相对应的部件或特征。
具体实施方式
在本公开的实施例中，公共控制信号包括但不限于公共下行同步/广播/控制信令，并且为公共控制信号分配一个或多个窄带。由于在这些公共信道中包括的信令数有限，因此分配窄带是合理的。
基于该方案，除了使用小区特定的波束成形来对抗毫米波通信信道的强的路径损耗，在本公开的可选的实施例中还可以使用功率增强来通过从相同的OFDM符号的其他的资源元素(resource element，RE)/子载波上借调能量来进一步增加控制信令的强度。这些RE/子载波并没有用于传输公共控制信号的RE/子载波，可以例如是空闲的和/或虽然非空闲但对能量的要求较低。或者，这些子载波用于数据传输，而数据可以用其他增强的方式发送，因此可以分出些功率给控制信道的传输。
在时域中，在UE接入之前，不同的公共控制信号(例如，同步信令和主系统模块(master information block，MIB))的传输周期和资源分配是可配置的和/或可预先定义的。例如可以在eNB和UE侧都预先配置好。对于公共控制信号的传输，在本公开的实施例中，提出了下列三种可选的传输方案：
方案1：多波束的空间复用
方案2：波束搜寻
方案3：组合的波束搜寻和复用
对于每种传输方案，公共控制信号的相应的参考信号序列被嵌入与用于公共控制信号的传输相同的波束成形的权重(也称为波束成形码字)。由于波束被用于传输所有的UE的公共控制信号，因此对于公共控制信号不再需要任何CSI。这是与波束成形的UE特定控制信令的关键不同，在波束成形的UE特定控制信令的方案中，需要用于多个波束的CSI反馈来进一步选择波束或调整信令的波束成形。因此，参考信号序列的设计和资源分配将与波束成形的UE特定控制信号或专属数据不同。具体地，在本公开的一个实施例中，在检测例如广播和控制信道之前，不同的小区的参考信号序列的资源分配的信息将对于UE而言是已知的，例如可以通过小区标识的方式来隐性地指示给UE。
下文将参照图1至6对上述三种方案进行详细描述。
方案1：多波束的空间复用
图1示出了根据本公开的一个实施例的用于传输公共控制信号的方法100的流程图。
如图1所示，在步骤S102中，基站配置第一波束成形码本。
在步骤S103中，基站使用第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码。
在步骤S105中，基站以空分复用的方式，使用多个波束来分别向小区中的相应的波束覆盖区域发送多个经预编码的公共控制信号。
可选地，在发送公共控制信号之前，该方法还包括步骤S101：基站使用波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生由多个波束分别承载的多个不同的参考信号序列。接着，基站以空分复用的方式，将多个波束分别发送至小区中的相应的波束覆盖区域。由此，UE可以利用收到的参考信号序列来对后续的公共控制信号进行信道估计和解调。
可选地，在本公开的一个实施例中，该方法还包括步骤S104：基站利用发送多个经预编码的公共控制信号的OFDM符号的至少一个子载波，来增加多个经预编码的公共控制信号的发送功率，其中至少一个子载波未用于发送多个经预编码的公共控制信号。由此，可以增加发送公共控制信号的功率，提高传输的鲁棒性。
在本公开的一个实施例中，该方法还包括步骤S106，在该步骤中，基站配置至少一个第二波束成形码本，其与第一波束成形码本分别不同。进一步地，基站使用至少一个第二波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码。并且，基站以空分复用的方式，使用多个波束分别向小区中的相应的波束覆盖区域发送多个经至少一个第二波束成形码本预编码的公共控制信号，其中以至少一个第二波束成形码本预编码的公共控制信号发送的波束覆盖区域相对于以第一波束成形码本预编码的公共控制信号发送的波束覆盖区域发生波束移位。在该实施例中，基站可以调节波束的发送角度，以覆盖原先未被覆盖的用户设备。
在本公开的一个实施例中，基站以空分复用的方式，使用多个波束分别向小区中的相应的波束覆盖区域、以预定顺序地发送多个经第一波束成形码本预编码的公共控制信号和多个经至少一个第二波束成形码本预编码的公共控制信号。在此，可以例如循环地和交替地进行发送。
在本公开的一个实施例中，该方法还包括：基站向用户设备发送配置信息，其包括：第一波束成形码本的码本尺寸和/或与波束移位相关的信息。应当注意，该步骤并不是必需的。
下文将进一步结合图2对上述各个步骤进行描述。
在该方案中，以空间复用的模式在多个波束上传输经不同的波束成形码字(也称为波束成形权重)预编码的相同的公共控制信号(同步/广播/控制信令)，以便由不同的区域/扇区覆盖的UE能够在同时接收到相同的公共控制信号。在该方案中，不同波束传输的公共控制信号的内容是相同的，但用于各个公共控制信号的波束成形 权重不同，以便预编码后的公共控制信号将形成空间复用。
此外，在该方案中，传输功率将分配为不同的波束上。在此，能够估计以功率限制支持的波束的数量，以满足在小区边缘的最小接收的SINR。
在本公开的一个实施例中，在承载公共控制信号的资源块中，以与应用于公共控制信号的波束矢量(也称为波束成形权重/码字)相同的空间复用的波束矢量来预编码公共控制信号的参考信号序列，并且将其嵌入至发送的资源块中，以进行信道估计和解调。在此，一个相同的参考信号序列，加权不同码字后将形成在多个波束上的不同的参考信号序列。
对于这个方案，由于不需要CSI反馈，参考信号序列的预编码和映射将与用于UE特定控制信令或专属数据的波束成形的传输完全不同。在波束成形的UE特定控制信令的方案中，一个波束成形的端口应当映射在一组特定资源元素上，而非共享资源。但是对于本公开中的用于公共同步/广播/控制的参考信号序列，多个波束的波束成形的参考信号序列应当在相同的资源元素上空间复用，以进一步解码，如图2所示。这种设置将显著地减少参考信号序列传输的负荷。
此外，在本公开的一个实施例中，在不同的波束之间的传输期间，覆盖不足的问题可能在相邻的波束之间的区域上出现。为了解决上述问题，提出了下述解决方案：
-使用功率增强来通过从相同的OFDM符号的其他的资源元素上借调能量来进一步增加控制信令的强度。
-使用波束移位(beam shift)方案来解决覆盖空洞问题。图2示出了具有2种波束移位的方案1。在时隙t中，UE 0位于两个相邻的波束之间的覆盖空洞中。在时隙t+1中，将在时隙t中形成的所有的波束移位角度θ。例如，θ＝360/N/2＝360/8/2＝22.5度。其中，N为波束的数量，随后UE0能够被覆盖并且节省公共同步/广播/控制信号。
在本公开的一个实施例中，还可以使用多种的波速移位方案。例如，可以相对于原来的各个波束偏移θ1、θ2....θn。在这种情况下，可以以预定顺序来传输上述多个不同的波束。例如，在时间上循环地发送。也即，在时隙t中，发送最初的波束；在时隙t+1中，发送波束偏移θ1的波束...在时隙t+n中，发送波束偏移θn的波束。在最后又返回至最初的波束进行发送。当然，在此也可以采取其他灵活地发送方式，例如交替地发送上述多个偏移的波束。
在这个方案中，对于码本的选择，UE是透明的并且不需要CSI反馈。在本公开的一个实施例中，eNB可以通过适合的方式(显性地/隐性地)告知UE需要检测波束成形的公共控制信号的时间/周期、码本尺寸和/或与波束移位相关的信息(例如波束移位的具体图案，按何种顺序进行发送等)。应当理解，上述各种信息并不是必需的，而仅仅在需要时进行发送。
当UE位于两个波束的重叠区域时，能够通过同时接收来自两个波束的信号来实现分集增益。
将继续参照图2来阐述上述方案的具体实施过程。如图2所示，在图2的示例中使用了8个波束来传输公共控制信号。在此，将例如使用包括8个波束成形码字/权重的波束成形码本对公共控制信号进行预编码，并且采用空间复用的方式进行传输。如图2所示，8个数据流叠加在相应的时频资源上进行传输。在本公开的一个实施例中，8个波束成形码字/权重能够以空间复用波束成形矩阵的形式呈现。
为了便于阐述，下文将借助于式1来阐述本公开的一个实施例。然而，应当理解下述公式并不限制本公开的范围，而仅仅是一种码本设计准则。本领域的技术人员应当理解，还可以使用其他码本设计准则。
如式1所示，y1....y8为UE接收到的由各个波束承载的公共控制信号。S1...S8为内容相同的公共控制信号。H为信道矩阵。
Figure PCTCN2016079081-appb-000001
在本公开的一个实施例中，例如可以如下地选择波束成形矩阵(预编码矩阵)W中的波束成形码字/权重w1...w8，以使得式1中的hiwi不等于零并且hiwj＝0或接近于零，也即进行空间复用。由此，将产生如图2中所示的8个波束，其分别指向并且覆盖不同的区域(或者称为扇区)。由此，在不同区域中具有内容相同的、但预编码方式不同的公共控制信号。例如波束1可以表示为h1w1s1，波束2可以表示为h2w2s2。
进一步地，在发送上述携带公共控制信号的波束之前，可以以相同的波束成形码字/权重w1...w8来发送携带公共控制信号的参考信号序列的波束。也即对参考信号序列采用与公共控制信号相同的预编码方式。从而，UE可以进行信道估计和解调随后发送的公共控制信号。
此外，上述参考信号序列可以嵌入在用于传输各个公共控制信号的物理资源块的区域中，并且在相同的资源元素上空间复用，以进一步节约资源开销。
如前所述，当UE落入位于两个相邻的波束之间的覆盖空洞时，可以采用波束移位的方法来解决上述问题。例如可以通过调节波束成形码字/权重w1...w8，来将先前的所有的波束移位角度θ。可选地，这例如也可以通过配置另一波束成形码本(也即使用另一空间复用波束成形矩阵)的方式来实现。在所有的波束移位角度θ之后，UE0能够被覆盖并且节省公共同步/广播/控制信号。
根据本公开的一个实施例，可以在时间上交替地或循环地变化波束的方向，也即基站可以交替地或循环地发送经由第一个空间复用波束成形矩阵和第二个空间复用波束成形矩阵预编码的公共控制信号。在此，仅仅以两个空间复用波束成形矩阵进行了描述，应当理解上述思路可以拓展至多个空间复用波束成形矩阵。
方案2：波束搜寻方案
图3示出了根据本公开的另一个实施例的用于传输公共控制信号的方法200的流程图。
如图3所示，在步骤S202中，基站配置波束成形码本。
随后，在步骤S203中，基站使用波束成形码本中的各个波束成形码字，来分别对公共控制信号进行预编码。
接着，在步骤S204中，对于每个经预编码的公共控制信号，基站分别以单个波束来依次扫描整个小区，以传输经预编码的公共控制信号，其中单个波束承载一个经预编码的公共控制信号。
可选地，在发送公共控制信号之前，该方法还包括步骤S201：基站使用波束成形码本中的各个波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列。并且，对于每个经预编码的参考信号序列，基站分别以单个波束来依次扫描整个小区，其中单个波束承载一个经预编码的参考信号序列。由此，UE可以利用收到的参考信号序列来对后续的公共控制信号进行信道估计和解调。
在本公开的一个实施例中，该方法还包括：基站向用户设备发送配置信息，其包括：单个波束扫描整个小区的周期、传输公共控制信号的持续周期以及波束成形码本的码本尺寸中的至少一个。应当注意，上述配置信息并不是必需要发送的。
下文将结合图4对上述方法步骤进行详细地说明。
在该方案中，在基站(eNB)侧在整个小区上扫描波束，其具有相同的公共控制信号。此外，以与预编码公共控制信号相同的波束成形矢量(也即波束成形权重/码字)来预编码公共控制信号的参考信号序列并且将其嵌入至资源块中。
在该方案中，对于单个UE，在指向其的波束上接收的信号是最强的，而在其他波束上接收的信号很弱，以至于这些信号并不能够被成功地解码。
因此，在本公开的一个实施例中，在整个小区上完成波束扫描 的时间被表示为有效更新周期，即N个时隙，其中N是波束的数量。例如在一个时隙中来在整个小区中扫描一个波束。并且，可选地，在一个有效更新周期扫描一种公开控制信号，而在下一个有效更新周期扫描另一种公开控制信号。
可选地，该方案还可以结合其他的鲁棒性方案来实施，诸如高的冗余度、低的调制与编码方式。由此能够减轻由具有较少数量的波束的波束搜寻带来的时间负担。
图4示出了方案2的示意图，中央窄带资源区域被分配给波束成形的公共控制信号(同步/广播/控制信令)。在N个时隙的周期中，通过波束1至波束N的不同的波束成形权重来分别对相同内容的公共控制信号进行预编码，以产生N个经预编码的公共控制信号。随后在不同的时隙1至N分别进行上传输N个经预编码的公共控制信号。也即，在该方案中，将一个接一个地扫描地传输经不同的波束成形权重预编码的相同内容的公共控制信号。
由于波束成形的权重在eNB侧被预定义为一个码本以用波束扫描来覆盖整个小区，在有效的更新周期(N个时隙)之后，在小区中的一个UE能够在最指向它的波束处接收到强的波束成形的公共控制信号。
在本公开的一个实施例中，为了确定波长成形矢量，例如如在LTE/LTE-A码本设计中使用地，能够考虑基于DFT的码本
Figure PCTCN2016079081-appb-000002
其中NTx是发送天线的数量，而N是波束/天线端口的数量。在此，需要指出的是，本公开的范围中的码本可以沿用LTE/LTE-A任何适合的码本，并且上述示例也不排除使用其他的码本。
对于公共控制信号，码本选择也是基本上对于UE透明的，并且不需要任何的CSI反馈。
在有效更新周期期间，相同的公共控制信号在不同的时隙上在不同的波束上传输。UE将试图在有效更新周期期间的每个时隙上接收公共控制信号，并且在在某个波束上成功地接收(例如高于与该波束对应的预定SINR阈值)之后实施相应的流程。在该流程中， UE不需要获悉波束的详情。
在本公开的一个实施例中，基站还可以向UE发送配置信息，该配置信息包括：单个波束扫描整个小区的周期、传输公共控制信号的持续周期(也即前述的有效更新周期)和/或码本尺寸。从而，UE可以根据上述配置信息对所需要的公共控制信号进行检测。类似地，应当理解，上述配置信息并不是必需的，而仅仅在需要时进行发送。
在本公开的一个实施例中，与方案1类似，在小区中扫描上述携带公共控制信号的波束之前，可以以用于公共控制信号的波束成形码字/权重相同的波束成形码字/权重来加权参考信号序列，以便以单个波束对整个小区进行依次扫描。在此，每个单个波束承载一个经预编码的参考信号序列。也即对参考信号序列采用与公共控制信号相同的预编码方式。从而，UE可以进行信道估计和解调随后发送的公共控制信号。
与方案1相比，方案2传输延迟稍大，并且对于所有的波束并没有功率共享。为在此，了进一步解决在两个波束之间的覆盖范围空洞问题，也能够使用方案1中的功率增强和波束移位。对于波束移位，能够调节前述的波束成形码字，从而以更窄的角度间隔来扫描波束，以覆盖所有的小区区域。波束宽度的调节可以通过调节天线配置和码本选择来来实现。
方案3：波束搜寻和复用的组合
图5示出了根据本公开的又一个实施例的用于传输公共控制信号的方法300的流程图。
如图5所示，在步骤S302中，基站配置波束成形码本。
在步骤S303中，基站使用波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码。
随后，在步骤S304中，基站以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中单个波束承载一个经预编码的公共控制信号。
在本公开的一个实施例中，在发送公共控制信号之前，方法还包括步骤S301，在该步骤中，基站还使用波束成形码本中的各个波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列。随后，基站对于每个经预编码的参考信号序列，分别以单个波束来依次扫描整个小区，其中单个波束承载一个经预编码的参考信号序列。由此，UE可以利用收到的参考信号序列来对后续的公共控制信号进行信道估计和解调。
在本公开的一个实施例中，配置波束成形码本进一步包括：基站借助于区域码本与波束扫描码本来确定波束成形码本，其中，区域码本包括NSector个码字，其分别指示小区中的不同区域，波束扫描码本包括Nbeam个码字，其指示一个区域中可用的波束成形码字。
可选地，基站可以通过对区域码本与波束扫描码本求矩阵克罗内克积的方式来确定波束成形码本。
下文将结合图6来对上述各个步骤进行进一步地说明。
整个小区通过传输过程中的空间复用的方式被划分为不同的区域/扇区，并且在每个扇区中进一步实施类似方案2中的波束搜寻。对于所有的扇区，可以同时实施扇区内的波束搜寻。该方案可以在搜寻时间与功率分配之间折衷。类似地，以相同的波束成形矢量预编码参考信号序列和公共控制信号。
如图6所示，给出了N＝16个波束的示例，其中首先小区划分为4个扇区并且同时在4个扇区上扫描4个波束。接着，在每个扇区中一个接一个地扫描4个波束。这16个波束都携带相同的公共控制信号，然而这些公共控制信号经过不同的波束成形矢量预编码，以形成前述的传输方式。
在此，前述的每次扫描都是同时进行。从时隙上的eNB的角度，在一个时隙上同时扫描了具有相同的公共控制信号的4个波束。在此，4个数据流叠加在相应的时频资源上进行传输。
方案3是一个平衡的方案，其可以相对于方案1缓解功率损耗 并且相对于方案2增加时间效率。在本公开的一个实施例中，为了减少搜寻时间，能够通过搜寻序列，例如二分搜寻，来优化波束搜寻图案。
在本公开的一个实施例中，波束成形码本包括区域/扇区码本和波束扫描码本。
在下述示例中，将扇区码本表示为
Figure PCTCN2016079081-appb-000003
该区域码本包括NSector个码字，其分别指示小区中的不同区域/扇区。将波束扫描码本表示为
Figure PCTCN2016079081-appb-000004
其指示一个区域中可用的波束成形码字。
借助于上述两个码本可以确定波束成形码本。可选地，在本公开的一个实施例中，通过将上述两个码本进行叉乘来确定波束成形码本。当然也可以采用其他适合的方式。
下文将以对两个码本求矩阵克罗内克积的方式的实施方式进行阐述。
随后，在一个下行时隙中，通过预编码器(也即波束成形码本，即式1中的W矩阵)
Figure PCTCN2016079081-appb-000005
来以空间复用的方式发送相同的公共控制信号。在此，也将运用前述的“hiwi不等于零并且hiwi＝0”来进行空间复用。
在本公开的一个实施例中，扇区和波束扫描序列能够被分隔并且灵活地组合，这将加速信令传输。UE可以忽略详细的扫描方式/配置，这是因为UE仅仅关心指向其的波束扫描传输并且获取最佳的接收质量。对于参考信号序列，由于在一个时隙中，也以空间复用的方式来发送四个波束。具体地，也可以通过用于公共控制信号的相同的波束权重来预编码参考信号序列，并且以相同的空间复用的方式来发送。从而，UE可以进行信道估计和解调随后发送的公共控制信号。
类似地，方案3中也可以结合使用方案1中的功率增强和波束移位。
虽然方案3的码本设计与前述的两个方案不同，如在前述方案中所述地，UE仍能够对于码本选择而言是透明的并且不需要CSI反 馈。可选地，eNB还可以向UE发送配置信息，该配置信息包括：单个波束扫描整个区域的周期和/或传输公共控制信号的持续周期(也即前述的有效更新周期)。从而，UE可以根据上述配置信息对所需要的公共控制信号进行检测。
图7示出了根据本公开的一个实施例的用于传输公共控制信号的装置示意图。装置10包括：配置单元101、预编码单元102和发送单元103。
配置单元101，用于配置第一波束成形码本。
预编码单元102，用于使用第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码。
发送单元103，用于以空分复用的方式，使用多个波束来分别向小区中的相应的区域发送多个经预编码的公共控制信号。
此外，预编码单元102还被配置为使用波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生由多个波束分别承载的多个不同的参考信号序列。
发送单元103还被配置为以空分复用的方式，将多个波束分别发送至小区中的相应的区域。
此外，装置10还包括功率增强单元，其用于利用发送多个经预编码的公共控制信号的OFDM符号的至少一个子载波，来增加多个经预编码的公共控制信号的发送功率，其中至少一个子载波未用于发送多个经预编码的公共控制信号。
优选地，配置单元101还用于配置至少一个第二波束成形码本，第二波束成形码本与第一波束成形码本不同；使用至少一个第二波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以空分复用的方式，使用多个波束分别向小区中的相应的区域发送多个经至少一个第二波束成形码本预编码的公共控制信号，其中以至少一个第二波束成形码本预编码的公共控制信号发送的区域相对于以第一波束成形码本预编码的公共控制信号发送的区域发生波束移位。
优选地，发送单元103还被配置为以空分复用的方式，使用多个波束分别向小区中的相应的区域、以预定顺序地发送多个经第一波束成形码本预编码的公共控制信号和多个经至少一个第二波束成形码本预编码的公共控制信号。
优选地，发送单元103还被配置为向用户设备发送配置信息，配置信息包括：第一波束成形码本的码本尺寸和/或与波束移位相关的信息。
图8示出了根据本公开的另一个实施例的用于传输公共控制信号的装置示意图。装置20包括：配置单元201、预编码单元202和扫描单元203。
配置单元201，用于配置波束成形码本。
预编码单元202，用于使用波束成形码本中的各个波束成形码字，来分别对公共控制信号进行预编码。
扫描单元203，用于对于每个经预编码的公共控制信号，分别以单个波束来依次扫描整个小区以传输经预编码的公共控制信号，其中单个波束承载一个经预编码的公共控制信号。
优选地，装置20还包括发送单元，其用于向用户设备发送配置信息，配置信息包括：单个波束扫描整个小区的周期、传输公共控制信号的持续周期以及波束成形码本的码本尺寸中的至少一个。
预编码单元202还被配置为用于使用波束成形码本中的各个波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列。
扫描单元203还被配置为用于对于每个经预编码的参考信号序列，分别以单个波束来依次扫描整个小区，其中单个波束承载一个经预编码的参考信号序列。
图9示出了根据本公开的又一个实施例的用于传输公共控制信号的装置示意图。装置30包括：配置单元301、预编码单元302和扫描单元303。
配置单元301，用于配置波束成形码本。
预编码单元302，用于使用波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码。
扫描单元303，用于以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在每个区域中，分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中单个波束承载一个经预编码的公共控制信号。
在此，配置单元301进一步配置为借助于区域码本与波束扫描码本来确定波束成形码本，其中，区域码本包括NSector个码字，其分别指示小区中的不同区域，波束扫描码本包括Nbeam个码字，其指示一个区域中可用的波束成形码字。
优选地，配置单元301进一步配置为通过将区域码本与波束扫描码本叉乘来确定波束成形码本。
预编码单元302还被进一步配置为使用波束成形码字，来分别对公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列。
扫描单元303还被进一步配置为以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个不同的经预编码的参考信号序列，其中单个波束承载一个经预编码的参考信号序列。
对于本领域技术人员而言，显然本公开不限于上述示范性实施例的细节，而且在不背离本公开的精神或基本特征的情况下，能够以其他的具体形式实现本公开。因此，无论如何来看，均应将实施例看作是示范性的，而且是非限制性的。此外，明显的，“包括”一词不排除其他元素和步骤，并且措辞“一个”不排除复数。装置权利要求中陈述的多个元件也可以由一个元件来实现。第一，第二等词语用来表示名称，而并不表示任何特定的顺序。

Claims (19)

  1. 一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：
    配置第一波束成形码本；
    使用所述第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及
    以空分复用的方式，使用多个波束来分别向小区中的相应的波束覆盖区域发送多个经预编码的公共控制信号。
  2. 根据权利要求1所述的方法，还包括：
    使用所述波束成形码字，来分别对所述公共控制信号的参考信号序列进行预编码，以产生由所述多个波束分别承载的多个不同的参考信号序列；以及
    以空分复用的方式，将所述多个波束分别发送至所述小区中的所述相应的波束覆盖区域。
  3. 根据权利要求1或2所述的方法，还包括：
    利用发送所述多个经预编码的公共控制信号的至少一个OFDM符号的至少一个子载波，来增加所述多个经预编码的公共控制信号的发送功率，其中所述至少一个子载波未用于发送所述多个经预编码的公共控制信号。
  4. 根据权利要求1或2所述的方法，还包括：
    配置至少一个第二波束成形码本，所述第二波束成形码本与所述第一波束成形码本不同；
    使用所述至少一个第二波束成形码本中的波束成形码字，来分别对所述多个相同的公共控制信号进行预编码；
    以空分复用的方式，使用多个波束分别向所述小区中的相应的波束覆盖区域发送多个经所述至少一个第二波束成形码本预编码的公共控制信号，其中以所述至少一个第二波束成形码本预编码的公共控制信号发送的波束覆盖区域相对于以所述第一波束成形码本预 编码的公共控制信号发送的波束覆盖区域发生波束移位。
  5. 根据权利要求4所述的方法，还包括：
    以空分复用的方式，使用多个波束分别向小区中的相应的波束覆盖区域、以预定顺序地发送多个经所述第一波束成形码本预编码的公共控制信号和多个经所述至少一个第二波束成形码本预编码的公共控制信号。
  6. 根据权利要求4或5所述的方法，还包括：
    向用户设备发送配置信息，所述配置信息包括：所述第一波束成形码本的码本尺寸和/或与所述波束移位相关的信息。
  7. 根据权利要求1所述的方法，其中，所述公共控制信号至少包括以下中的至少一项：
    同步信令；
    广播信令；以及
    公共控制信令。
  8. 一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：
    配置波束成形码本；
    使用所述波束成形码本中的各个波束成形码字，来分别对所述公共控制信号进行预编码；以及
    对于每个经预编码的公共控制信号，分别以单个波束来依次扫描整个小区，以传输所述经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
  9. 根据权利要求8所述的方法，还包括：
    向用户设备发送配置信息，所述配置信息包括：所述单个波束扫描整个小区的周期、传输所述公共控制信号的持续周期以及所述波束成形码本的码本尺寸中的至少一个。
  10. 根据权利要求7或8所述的方法，还包括：
    使用所述波束成形码本中的各个波束成形码字，来分别对所述公共控制信号的参考信号序列进行预编码，以产生多个不同的经预 编码的参考信号序列；以及
    对于每个经预编码的参考信号序列，分别以单个波束来依次扫描整个小区，其中所述单个波束承载一个经预编码的参考信号序列。
  11. 根据权利要求8所述的方法，其中，所述公共控制信号至少包括以下中的至少一项：
    同步信令；
    广播信令；以及
    公共控制信令。
  12. 一种在毫米波通信系统的基站中用于传输公共控制信号的方法，包括：
    配置波束成形码本；
    使用所述波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及
    以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在所述每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
  13. 根据权利要求12所述的方法，其中，配置波束成形码本进一步包括：
    借助于区域码本与波束扫描码本来确定所述波束成形码本，其中，所述区域码本包括NSector个码字，其分别指示所述小区中的不同区域，所述波束扫描码本包括Nbeam个码字，其指示一个区域中可用的波束成形码字。
  14. 根据权利要求13所述的方法，还包括：
    通过对所述区域码本与所述波束扫描码本求矩阵克罗内克积的方式来确定所述波束成形码本。
  15. 根据权利要求12至14中任一项所述的方法，还包括：
    使用所述波束成形码字，来分别对所述公共控制信号的参考信号序列进行预编码，以产生多个不同的经预编码的参考信号序列； 以及
    以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在所述每个区域中分别以不同的单个波束来依次扫描整个区域，以传输所述多个不同的经预编码的参考信号序列，其中所述单个波束承载一个经预编码的参考信号序列。
  16. 根据权利要求12所述的方法，其中，所述公共控制信号至少包括以下中的至少一项：
    同步信令；
    广播信令；以及
    公共控制信令。
  17. 一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：
    配置单元，用于配置第一波束成形码本；
    预编码单元，用于使用所述第一波束成形码本中的波束成形码字，来分别对多个相同的公共控制信号进行预编码；以及
    发送单元，用于以空分复用的方式，使用多个波束来分别向小区中的相应的波束覆盖区域发送多个经预编码的公共控制信号。
  18. 一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：
    配置单元，用于配置波束成形码本；
    预编码单元，用于使用所述波束成形码本中的各个波束成形码字，来分别对所述公共控制信号进行预编码；以及
    扫描单元，用于对于每个经预编码的公共控制信号，分别以单个波束来依次扫描整个小区以传输所述经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
  19. 一种在毫米波通信系统的基站中用于传输公共控制信号的装置，所述装置包括：
    配置单元，用于配置波束成形码本；
    预编码单元，用于使用所述波束成形码本中的波束成形码字， 来分别对多个相同的公共控制信号进行预编码；以及
    扫描单元，用于以空分复用的方式，在小区的每个区域中分别使用单个波束来同时扫描每个区域，并且在所述每个区域中分别以不同的单个波束来依次扫描整个区域，以传输多个经预编码的公共控制信号，其中所述单个波束承载一个经预编码的公共控制信号。
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