WO2016049934A1 - 一种基于加权聚合传输控制信号的方法与设备 - Google Patents

一种基于加权聚合传输控制信号的方法与设备 Download PDF

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Publication number
WO2016049934A1
WO2016049934A1 PCT/CN2014/088066 CN2014088066W WO2016049934A1 WO 2016049934 A1 WO2016049934 A1 WO 2016049934A1 CN 2014088066 W CN2014088066 W CN 2014088066W WO 2016049934 A1 WO2016049934 A1 WO 2016049934A1
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Prior art keywords
aggregation level
base station
control signal
aggregation
antenna element
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PCT/CN2014/088066
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English (en)
French (fr)
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罗庆霖
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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 EP14903478.7A priority Critical patent/EP3203768A4/en
Priority to JP2017517325A priority patent/JP2017539110A/ja
Priority to US15/515,669 priority patent/US10333598B2/en
Priority to PCT/CN2014/088066 priority patent/WO2016049934A1/zh
Priority to KR1020177011834A priority patent/KR20170065612A/ko
Priority to CN201480081843.7A priority patent/CN106688260B/zh
Publication of WO2016049934A1 publication Critical patent/WO2016049934A1/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
    • H04B7/06—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
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/267—Phased-array testing or checking devices
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a technique for transmitting control signals based on weighted aggregation.
  • a conventional multiple input multiple output (MIMO) system as shown in FIG. 1 , an example of conventional MIMO is shown, and an evolved Node B (eNB) mainly optimizes user equipments on the service ground (UE, User Equipment). ).
  • UE User Equipment
  • the vertical dimension the same narrow beam is used for data and control transmission, and the vertical beam usually points to the UE with the most traffic on the ground.
  • narrow beams are only used for data transmission, and wide beams are used to control transmission to ensure their reliability in the target coverage area.
  • 3D-MIMO three-dimensional MIMO
  • the eNB needs to cover UEs on the ground and on the upper floors.
  • the eNB uses different vertical beams to serve UEs located on different floors.
  • PDCCH Physical Downlink Control Channel
  • the eNB needs to implement a wide vertical beam for PDCCH transmission.
  • the wide vertical beam is capable of repairing PDCCH coverage vulnerabilities caused by narrow vertical beams in the vertical dimension, which also creates reasonable 3D cell coverage for each eNB so that the eNB can adjust the vertical narrow beams to transmit data to its PDCCH 3D covers any UE in the area.
  • a method for transmitting a control signal based on weighted aggregation at a base station side comprises the following steps:
  • a method for assisting transmission of a control signal based on weighted aggregation at a user equipment side comprising:
  • the method further comprises:
  • a base station for transmitting a control signal based on weighted aggregation is further provided, wherein the base station includes:
  • a vector determining device configured to determine each aggregation level weight vector corresponding to a control signal transmitted by a multi-antenna element corresponding to a common control channel port;
  • a transmitting device configured to transmit the control signal by using the multiple antenna elements according to the aggregation level weight vectors.
  • a user equipment for facilitating transmission of a control signal based on weighted aggregation, wherein the user equipment comprises:
  • a first receiving device configured to receive a corresponding base station corresponding to a common control channel port a control signal transmitted by the antenna element, wherein the control signal is transmitted according to each aggregation level weight vector corresponding to the multiple antenna element;
  • the user equipment further includes:
  • the second receiving device is configured to receive the aggregation level weight vector sent by the base station, to perform a DCI blind detection operation, and obtain downlink control information corresponding to the control signal.
  • a system for transmitting a control signal based on weighted aggregation comprising a base station for transmitting a control signal based on weighted aggregation as described above according to an aspect of the present invention, And a user equipment for facilitating transmission of control signals based on weighted aggregation as described above in accordance with another aspect of the present invention.
  • an embodiment of the present invention determines the weighting vectors of the aggregation levels corresponding to the control signals transmitted by the multiple antenna elements corresponding to the common control channel ports, according to the weighting vectors of the aggregation levels. Transmitting the control signal by the multi-antenna element, realizing coverage enhancement of a common control channel in a 3D-MIMO system, solving the problem of coverage vulnerability in 3D-MIMO by introducing a 2D planar array, and the antenna array of the present invention The gain is more evenly distributed over the entire EOD (vertical direction) span and the gain is significant.
  • FIG. 1 shows a schematic diagram of an example of conventional MIMO
  • FIG. 2 shows a schematic diagram of an example of 3D-MIMO
  • FIG. 3 shows a schematic diagram of an apparatus for a base station for transmitting control signals based on weighted aggregation, in accordance with an aspect of the present invention
  • Figure 4 shows a schematic diagram of the cumulative distribution function of different schemes ("3D UMa” and "3D UMi”) in different configurations;
  • Figure 5 is a schematic diagram showing weighted aggregation of the same aggregation level but different time/frequency domain repetitions
  • Figure 6 shows an antenna array beam gain map of different antenna elements with half-wavelength spacing
  • FIG. 8 shows a flow chart of a method for transmitting control signals based on weighted aggregation, in accordance with another aspect of the present invention.
  • FIG. 3 shows a schematic diagram of an apparatus for a base station 1 for transmitting control signals based on weighted aggregation, in which the base station 1 comprises a vector determining means 11 and a transmitting means 12, in accordance with an aspect of the invention.
  • the vector determining apparatus 11 determines each aggregation level weight vector corresponding to the control signal transmitted by the multi-antenna element corresponding to the common control channel port; and the transmission device 12 passes the multiple antenna according to the aggregation level weight vector. Element, transmitting the control signal.
  • the base station 1 refers to a device in a mobile communication system that connects a fixed portion and a wireless portion and is connected to the mobile station by wireless transmission in the air, including but not limited to, for example, a Node B base station, an eNB base station, and the like. It should be understood by those skilled in the art that the above-mentioned base station is only an example, and other existing or future base stations may be applicable to the present invention, and are also included in the scope of the present invention, and are hereby incorporated by reference.
  • the UMA scheme based on the 3GPP 3D-MIMO channel model in the standard TR36.973 (Urban Macro cell with high (outdoor/indoor) UE density, hereinafter referred to as "3D UMa") is used.
  • System-level simulation is performed with two schemes of the UMi scheme (ie, Urban Micro cell with high (outdoor/indoor) UE density, hereinafter referred to as "3D UMi"), and one scheme adopts configuration 1 with a single antenna element per port (ie, Conventional 2D-MIMO with a linear array, another solution uses configuration 2 with 10 antenna elements per port (ie 3D-MIMO with a planar array).
  • the cumulative distribution function (CDF, cumulative distribution function) of different schemes and different configurations as shown in FIG. 4 is obtained, thereby showing the difference of the corresponding SINR, which can be seen from FIG.
  • the per-port SINR of configuration 1 is 3 dB higher than the per-port SINR of configuration 2, which indicates that the common control channel of the 3D-MIMO system is 3 dB worse than the common control channel of the 2D-MIMO system.
  • each antenna port is composed of a plurality of antenna elements, and in a 3D-MIMO system, each antenna port is composed of only one antenna element, and thus has a low combined gain.
  • Search space for PDCCH and EPDCCH in the current LTE specifications know A set of control channel candidates are defined for each aggregation level L and subframe K, respectively, and the search space formula in 3GPP TS 36.213 gives a CCE (Control Channel Element) or ECCE belonging to each candidate. (Enhanced CCE, Enhanced Control Channel Element).
  • CCE Control Channel Element
  • ECCE Enhanced Control Channel Element
  • the index and size of the RNTI Radio Network Temporary Identifier
  • the EPDCCH set affect the search space expression.
  • a simple method is to repeatedly transmit CCEs/ECCEs given by the same search space in a subband/time window (eg, several consecutive RBs/subframes). Assuming that the aggregation level is L, the starting subframe is k 0 , and the repeating time window extends the largest K subframes until the subframe k end .
  • the UE needs to have a total CCE or ECCE aggregation level of A. If the aggregation level in the candidate m of each subframe is added to A over the entire K subframe, as shown in FIG. 5, for each sub-
  • the same aggregation level but different time/frequency domain repetition weighted aggregation, different colors indicate different weights.
  • the eNB can determine two of the three parameters and according to the performance The target identifies another.
  • each antenna port can be composed of multiple vertical antenna elements - to enhance the coverage of the 3D-MIMO common control channel to achieve performance goals, such as at least comparable to the performance of 2D-MIMO systems Matching and avoiding vertical dimension coverage vulnerabilities, the inventive solution achieves this performance goal.
  • a base station 1 for transmitting a control signal based on weighted aggregation will be described below with reference to FIG. 3:
  • the base station 1 vector determining means 11 determines each aggregation level weight vector corresponding to the control signal transmitted by the multi-antenna element corresponding to the common control channel port.
  • each aggregation level weight vector refers to an aggregation level weight vector corresponding to each aggregation level
  • the aggregation weight vector of different aggregation levels can be uniformly expressed by the following formula (1):
  • N is the number of antenna elements per PDCCH or ePDCCH port
  • a represents an aggregation level
  • w a is an aggregation level weight vector corresponding to aggregation level a.
  • the aggregation level weight vector may be a discrete Fourier transform (DFT) vector, or may be a downtilt angle vector of the 3D-MIMO scheme.
  • DFT discrete Fourier transform
  • the vector determining means 11 can determine by the following formula (2):
  • w a,n represents a weight component corresponding to the a-th aggregation level of the n-th antenna element of the plurality of antenna elements
  • d represents an interval between antenna elements in the multi-antenna element
  • N represents the plurality of The number of antenna elements in the antenna element
  • n represents the nth antenna element of the plurality of antenna elements
  • ⁇ represents the wavelength used when the multi-antenna element corresponding to the common control channel port transmits a control signal
  • ⁇ a represents Corresponds to the downtilt of the polymerization level a.
  • the vector determining means 11 can obtain the aggregation level weight vector w a corresponding to the aggregation level a .
  • the vector determining means 11 can also obtain the corresponding four weights according to the formula (2)
  • each weight component in the aggregation level weight vector is only an example, and other existing or future possible methods for determining each weight component in the aggregation level weight vector are as follows. It is intended to be within the scope of the invention, and is hereby incorporated by reference.
  • the weight of the a-th aggregation level of the n-th antenna element can be obtained according to a given downtilt angle corresponding to the aggregation level, that is, as shown in the above formula (1).
  • the combined power of all weighted signals should be greater than the power of any single weighted signal, ie.
  • a single vector in W can be determined such that at least one version of the control signal can be received by the UE.
  • the weighted polymerization scheme of the present invention will outperform conventional aggregation/repetition schemes.
  • the EOD is in the range of (70 to 120) degrees, and for the UMa scheme, the EOD is in ( 90 to 120) degrees. Therefore, for the UMi scheme, the EOD span is 50 degrees, and for the UMa scheme, the EOD span is 30 degrees.
  • 6 is an example of an antenna array having 2, 4, and 8 antenna elements, respectively, showing an antenna array beam gain spectrum of different antenna elements having a half-wavelength interval. As can be seen from FIG.
  • the antenna array having two antenna elements has a beam gain of less than 0 dB, and for an antenna array having four antenna elements, the angle range corresponding to the 3 dB beam gain is (-18 degrees to +18 degrees), for An antenna array of 8 antenna elements, which corresponds to an angular range of (-11 degrees to +11 degrees) at a beam gain of 3 dB. Therefore, for the 3 dB gain in FIG. 6, the maximum angular coverage of the antenna array having 2, 4, and 8 antenna elements (AE, Antenna Element) is 0, 36, and 22 degrees, respectively.
  • the transmission device 12 transmits the control signal by using the multi-antenna element according to the weighting vector of each aggregation level, such as applying the weighting vector of each aggregation level to the control signal, that is, each aggregation level weight vector
  • the vectors corresponding to the control signals are respectively multiplied, thereby transmitting the control signals through the multi-antenna elements.
  • a control signal sent from a plurality of antennas of a PDCCH or an ePDCCH port in CCEs or ECCEs given by a search space is marked to transmit the control signal through a plurality of antennas of a PDCCH or an ePDCCH port.
  • the various devices of the base station 1 are continuously operated. Specifically, the vector determining apparatus 11 continuously determines each aggregation level weight vector corresponding to the control signal of the multi-antenna transmission corresponding to the common control channel port; the transmission device 12 continues to use the weighting vector according to the aggregation level. A multi-antenna element transmits the control signal.
  • the "persistence" refers to continuously determining the weight vector of each aggregation level and the transmission of control information between the devices of the base station 1 until the base station 1 is in a long time.
  • the internal stop determines the respective aggregation level weight vectors.
  • the base station 1 further includes a downtilt determining means (not shown). Specifically, the downtilt determining means determines the downtilt angle corresponding to each of the aggregation levels based on the target angle coverage and the aggregation level application information.
  • the aggregation level application information refers to the quantity information of the aggregation level adopted by the system, such as adopting 4 aggregation levels or adopting 2 aggregation levels.
  • the target angle coverage refers to an angle that needs to be covered, such as a vertical angle that needs to be covered.
  • the downtilt determining device can be evenly distributed to each aggregation level, that is, each aggregation level needs to cover a 10 degree interval, so that the downtilt angles corresponding to the aggregation levels L1, L2, L3, and L4 are 85, 95, 105, 115, respectively.
  • the downtilt determining means may also determine the downtilt angle corresponding to each aggregation level according to a predetermined manner, such as assuming that the predetermined aggregation levels L1, L2 need to cover the 5 degree interval, and L3 and L4 need to cover the 15 degree interval, then
  • the inclination determining device can obtain the downtilt angles corresponding to the polymerization levels L1, L2, L3, and L4 of 82.5, 87.5, 97.5, and 112.5 degrees, respectively.
  • the base station 1 further includes basic determining means (not shown). Specifically, the basic determining apparatus determines a corresponding basic aggregation level according to the quantity information of the antenna elements in the multiple antenna elements and the target angular coverage.
  • the basic aggregation level refers to the minimum number of aggregation levels of the required angular coverage.
  • a minimum number of aggregation levels for each PDCCH or EPDCCH port antenna element number, antenna array spectrum, and required angular coverage, ie, the basic aggregation level (A min ) can be determined.
  • the basic determining apparatus can obtain:
  • the number of antenna elements per PDCCH or EPDCCH port may be a predetermined system parameter.
  • the base station 1 further comprises a transmitting device (not shown)
  • the user device 2 comprises a first receiving device (not shown) and a second receiving device (not shown).
  • the transmitting device 12 of the base station 1 transmits the control signal to the corresponding user equipment by using the multi-antenna element according to the weighting vector of each aggregation level; correspondingly, the first receiving device of the user equipment 2 receives the corresponding a control signal transmitted by the base station via a multi-antenna element corresponding to the common control channel port, wherein the control signal is transmitted according to each aggregation level weight vector corresponding to the multi-antenna element; the transmitting device of the base station 1
  • the aggregation level weight vector is sent to the corresponding user equipment for DCI blind detection; correspondingly, the second receiving apparatus of the user equipment 2 receives the aggregation level weight vectors sent by the base station for performing DCI blind detection Operation, obtaining downlink control information corresponding
  • the user equipment 2 refers to a device in the mobile communication device that terminates the wireless transmission from or to the network and adapts the capabilities of the terminal device to the wireless transmission, that is, the user accesses the mobile network.
  • the invention includes, but is not limited to, any electronic product that can communicate with a user through a keyboard, a touch pad, or a voice control device, and can transmit and receive signals through a mobile network and a base station to achieve transmission of a mobile communication signal, for example, Tablet PCs, smart phones, PDAs, car computers, etc.
  • the mobile network includes, but is not limited to, GSM, 3G, LTE, Wi-Fi, WiMax, WCDMA, CDMA2000, TD-SCDMA, HSPA, LTD, and the like.
  • the transmission device 12 of the base station 1 transmits the control signal to the corresponding user equipment by using the multi-antenna element according to the aggregation level weight vector.
  • a control signal sent from a plurality of antennas of a PDCCH or an ePDCCH port in CCEs or ECCEs given by a search space is marked to transmit the control signal through a plurality of antennas of a PDCCH or an ePDCCH port.
  • the first receiving device of the user equipment 2 receives the control signal transmitted by the corresponding base station via the multi-antenna element corresponding to the common control channel port, wherein the control signal is according to each aggregation level weight corresponding to the multiple antenna element Vector transmission.
  • the transmitting device of the base station 1 transmits the respective aggregation level weight vectors to the corresponding user equipment for DCI blind detection.
  • the vector determining means 11 can also obtain the corresponding four weights according to the formula (2)
  • the second receiving device of the user equipment 2 receives the aggregation level weight vector sent by the base station, for performing a DCI blind detection operation, and obtaining downlink control information corresponding to the control signal.
  • the transmission device 12 and the transmitting device of the base station 1 may be serially executed or executed in parallel; the transmission device 12 and the transmitting device may be integrated. It can also be a module that is independent of each other.
  • the first receiving device and the second receiving device of the user equipment 2 may be serially executed, or may be executed in parallel; the first receiving device and the second device.
  • the receiving devices can be integrated together or they can be independent modules.
  • FIG. 7 shows that each PDCCH port has 8 by analogy based on the scheme of the present invention.
  • the gain of the present invention is also significant with respect to the case of no aggregation (i.e., case 1 in Fig. 7 (no aggregation)) and a single antenna element (i.e., case 5 (single antenna element) in Fig. 7).
  • FIG. 8 shows a flow chart of a method for transmitting control signals based on weighted aggregation, in accordance with another aspect of the present invention.
  • the method comprises step S1 and step S2. Specifically, in step S1, the base station 1 determines each aggregation level weight vector corresponding to the control signal transmitted by the multi-antenna element corresponding to the common control channel port; in step S2, the base station 1 weights according to the aggregation levels. a vector through which the control signal is transmitted.
  • the base station 1 refers to a device in a mobile communication system that connects a fixed portion and a wireless portion and is connected to the mobile station by wireless transmission in the air, including but not limited to, for example, a Node B base station, an eNB base station, and the like. It should be understood by those skilled in the art that the above-mentioned base station is only an example, and other existing or future base stations may be applicable to the present invention, and are also included in the scope of the present invention, and are hereby incorporated by reference.
  • 3D UMa 3D UMa
  • 3D UMi 3D UMi
  • the scheme performs system-level simulation.
  • One scheme uses configuration 1 with a single antenna element per port (ie, traditional 2D-MIMO with linear array), and the other scheme uses a configuration with 10 antenna elements per port. 2 (ie 3D-MIMO with a planar array).
  • the cumulative distribution function (CDF, cumulative distribution) of different schemes and different configurations as shown in FIG. 4 is obtained. Function), thereby showing the difference of the corresponding SINR.
  • SINR per port of configuration 1 is 3 dB higher than the SINR per port of configuration 2, which indicates that the common control channel of the 3D-MIMO system is larger than that of the 2D-MIMO system.
  • the common control channel is 3dB worse.
  • Search space for PDCCH and EPDCCH in the current LTE specifications with A set of control channel candidates are defined for each aggregation level L and subframe K, respectively, and the search space formula in 3GPP TS 36.213 gives a CCE (Control Channel Element) or ECCE belonging to each candidate. (Enhanced CCE).
  • CCE Control Channel Element
  • ECCE ECCE belonging to each candidate.
  • RNTI Radio Network Temporary Identity
  • EPDCCH set affect the search space expression.
  • a simple method is to repeatedly transmit CCEs/ECCEs given by the same search space in a subband/time window (eg, several consecutive RBs/subframes). Assuming that the aggregation level is L, the starting subframe is k 0 , and the repeating time window extends the largest K subframes until the subframe k end .
  • the UE needs to have a total CCE or ECCE aggregation level of A. If the aggregation level in the candidate m of each subframe is added to A over the entire K subframe, as shown in FIG. 5, for each sub-
  • the weighting aggregation of the same aggregation level but different time/frequency domain repetition is different. Colors indicate different weights.
  • the eNB may determine two of the three parameters and determine the other based on the performance goal.
  • each antenna port can be composed of multiple vertical antenna elements - to enhance the coverage of the 3D-MIMO common control channel to achieve performance goals, such as at least comparable to the performance of 2D-MIMO systems Matching and avoiding vertical dimension coverage vulnerabilities, the inventive solution achieves this performance goal.
  • a method for transmitting a control signal based on weighted aggregation will be described below with reference to FIG. 8:
  • step S1 the base station 1 determines each aggregation level weight vector corresponding to the control signal transmitted by the multi-antenna element corresponding to the common control channel port.
  • each aggregation level weight vector means that each aggregation level has a corresponding aggregation level weight vector, and the aggregation weight vectors of different aggregation levels can be uniformly expressed by the following formula (4):
  • N is the number of antenna elements per PDCCH or ePDCCH port
  • a represents an aggregation level
  • w a is an aggregation level weight vector corresponding to aggregation level a.
  • the aggregation level weight vector may be a discrete Fourier transform (DFT) vector, or may be a downtilt angle vector of the 3D-MIMO scheme.
  • DFT discrete Fourier transform
  • the base station 1 For each weight component in the aggregation level weight vector, in step S1, the base station 1 can determine by the following formula (5):
  • w a,n represents a weight component corresponding to the a-th aggregation level of the n-th antenna element of the plurality of antenna elements
  • d represents an interval between antenna elements in the multi-antenna element
  • N represents the plurality of The number of antenna elements in the antenna element
  • n represents the nth antenna element of the plurality of antenna elements
  • ⁇ represents the wavelength used when the multi-antenna element corresponding to the common control channel port transmits a control signal
  • ⁇ a represents Corresponds to the downtilt of the polymerization level a.
  • the base station 1 can obtain an aggregation level weight vector w a corresponding to the aggregation level a .
  • each weight component in the aggregation level weight vector is only an example, and other existing or future possible methods for determining each weight component in the aggregation level weight vector are as follows. It is intended to be within the scope of the invention, and is hereby incorporated by reference.
  • the weight of the a-th aggregation level of the n-th antenna element can be obtained according to a given downtilt angle corresponding to the aggregation level, that is, as shown in the above formula (4).
  • the combined power of all weighted signals should be greater than the power of any single weighted signal, ie.
  • a single vector in W can be determined such that at least one version of the control signal can be received by the UE.
  • the weighted polymerization scheme of the present invention will outperform conventional aggregation/repetition schemes.
  • the EOD is in the range of (70 to 120) degrees, and for the UMa scheme, the EOD is in ( 90 to 120) degrees. Therefore, for the UMi scheme, the EOD span is 50 degrees, and for the UMa scheme, the EOD span is 30 degrees.
  • 6 is an example of an antenna array having 2, 4, and 8 antenna elements, respectively, showing an antenna array beam gain map of different antenna elements having a half-wavelength interval, from FIG. It can be seen that for the 3dB coverage gain, that is, for the 3dB gain in FIG.
  • the beam gain is below 0dB for the antenna array with 2 antenna elements, and for the antenna array with 4 antenna elements,
  • the 3dB beam gain corresponds to an angular range of (-18 degrees to +18 degrees).
  • the corresponding angular range at the 3dB beam gain is (-11 degrees to +11 degrees). Therefore, for the 3 dB gain in FIG. 6, the maximum angular coverage of the antenna array having 2, 4, and 8 antenna elements (AE, Antenna Element) is 0, 36, and 22 degrees, respectively.
  • step S2 the base station 1 transmits the control signal by using the multi-antenna element according to the aggregation level weight vector, and if each of the aggregation level weight vectors is respectively applied to the control signal, The aggregation level weight vectors are respectively multiplied by a vector corresponding to the control signal, thereby transmitting the control signal through the multi-antenna element.
  • a control signal sent from a plurality of antennas of a PDCCH or an ePDCCH port in CCEs or ECCEs given by a search space is marked to transmit the control signal through a plurality of antennas of a PDCCH or an ePDCCH port.
  • step S1 the base station 1 continuously determines each aggregation level weight vector corresponding to the control signal transmitted by the multi-antenna element corresponding to the common control channel port; in step S2, the base station 1 continues to perform the aggregation according to the aggregation.
  • a level weight vector through which the control signal is transmitted it should be understood by those skilled in the art that the "persistence" refers to continuously determining the weight vector of each aggregation level and the transmission of control information between the steps of the method until the base station 1 is in a long time.
  • the internal stop determines the respective aggregation level weight vectors.
  • the method further comprises a step S3 (not shown).
  • the base station 1 determines a downtilt angle corresponding to each aggregation level based on the target angle coverage and the aggregation level application information.
  • the aggregation level application information refers to the quantity information of the aggregation level adopted by the system, such as adopting 4 aggregation levels or adopting 2 aggregation levels.
  • the target angle coverage refers to an angle that needs to be covered, such as needs to be covered. The vertical angle.
  • each aggregation level there are 4 aggregation levels, such as L1, L2, L3, and L4, and the vertical angles to be covered are (80-120) degrees, and a total range of 40 degrees is included, in step S3.
  • the base station 1 can evenly allocate the 40 degree range to each aggregation level, that is, each aggregation level needs to cover a 10 degree interval, so that the downtilt angles corresponding to the aggregation levels L1, L2, L3, and L4 are 85, 95, respectively.
  • the base station 1 can also determine the downtilt angle corresponding to each aggregation level according to a predetermined manner, if it is assumed that the predetermined aggregation levels L1, L2 need to cover the 5 degree interval, and L3 and L4 need to be covered. In the 15-degree interval, in step S3, the base station 1 can obtain the downtilt angles corresponding to the aggregation levels L1, L2, L3, and L4 of 82.5, 87.5, 97.5, and 112.5 degrees, respectively.
  • the method further comprises a step S4 (not shown).
  • step S4 the base station 1 determines a corresponding basic aggregation level according to the number information of the antenna elements in the multiple antenna elements and the target angle coverage.
  • the basic aggregation level refers to the minimum number of aggregation levels of the required angular coverage.
  • a minimum number of aggregation levels for each PDCCH or EPDCCH port antenna element number, antenna array spectrum, and required angular coverage, ie, the basic aggregation level (A min ) can be determined.
  • the base station 1 can obtain:
  • the number of antenna elements per PDCCH or EPDCCH port may be a predetermined system parameter.
  • the method further comprises a step S5 (not shown). Specifically, in step S2, the base station 1 transmits the control signal to the corresponding user equipment by using the multi-antenna element according to the aggregation level weight vector; correspondingly, the user equipment 2 receives the corresponding base station and is controlled by the public.
  • step S5 the base station 1 sets the aggregation level The weight vector is sent to the corresponding user equipment for DCI blind detection; correspondingly, the user equipment 2 receives the aggregation level weight vectors sent by the base station for performing a DCI blind detection operation, obtaining the control The downlink control information corresponding to the signal.
  • the user equipment 2 refers to a device in the mobile communication device that terminates the wireless transmission from or to the network and adapts the capabilities of the terminal device to the wireless transmission, that is, the user accesses the mobile network.
  • the invention includes, but is not limited to, any electronic product that can communicate with a user through a keyboard, a touch pad, or a voice control device, and can transmit and receive signals through a mobile network and a base station to achieve transmission of a mobile communication signal, for example, Tablet PCs, smart phones, PDAs, car computers, etc.
  • the mobile network includes, but is not limited to, GSM, 3G, LTE, Wi-Fi, WiMax, WCDMA, CDMA2000, TD-SCDMA, HSPA, LTD, and the like.
  • step S2 the base station 1 transmits the control signal to the corresponding user equipment by using the multi-antenna element according to the aggregation level weight vector.
  • a control signal sent from a plurality of antennas of a PDCCH or an ePDCCH port in CCEs or ECCEs given by a search space is marked to transmit the control signal through a plurality of antennas of a PDCCH or an ePDCCH port.
  • the user equipment 2 receives a control signal transmitted by the corresponding base station via a multi-antenna element corresponding to the common control channel port, wherein the control signal is transmitted according to each aggregation level weight vector corresponding to the multiple antenna element.
  • step S5 the base station 1 transmits the respective aggregation level weight vectors to the corresponding user equipment for DCI blind detection.
  • the base station 1 can also obtain the corresponding according to the formula (5).
  • the user equipment 2 receives the aggregation level weight vectors sent by the base station to perform a DCI blind detection operation, and obtain downlink control information corresponding to the control signal.
  • step S2 and step S5 may be serial execution or parallel execution.
  • the present invention can be implemented in software and/or a combination of software and hardware, for example, using an application specific integrated circuit (ASIC), a general purpose computer, or any other similar hardware device.
  • the software program of the present invention may be executed by a processor to implement the steps or functions described above.
  • the software program (including related data structures) of the present invention can be stored in a computer readable recording medium such as a RAM memory, a magnetic or optical drive or a floppy disk and the like.
  • some steps of the invention or The functions may be implemented in hardware, for example, as a circuit that cooperates with a processor to perform various steps or functions.
  • a portion of the invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide a method and/or solution in accordance with the present invention.
  • the program instructions for invoking the method of the present invention may be stored in a fixed or removable recording medium and/or transmitted by a data stream in a broadcast or other signal bearing medium, and/or stored in a The working memory of the computer device in which the program instructions are run.
  • an embodiment in accordance with the present invention includes a device including a memory for storing computer program instructions and a processor for executing program instructions, wherein when the computer program instructions are executed by the processor, triggering
  • the apparatus operates based on the aforementioned methods and/or technical solutions in accordance with various embodiments of the present invention.

Abstract

本发明的目的是提供一种用于基于加权聚合传输控制信号的方法与设备。具体地，确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。与现有技术相比，本发明通过。与现有技术相比，本发明的一个实施例通过确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量，以根据各聚合级别权重矢量，通过多天线元，传输控制信号，实现了3D-MIMO系统中公共控制信道的覆盖增强，解决了因引入2D平面阵列在3D-MIMO中的覆盖漏洞问题，而且本发明的天线阵列增益在整个EOD跨度内更均匀分布，增益也是显著的。

Description

一种基于加权聚合传输控制信号的方法与设备 技术领域
本发明涉及通信技术领域，尤其涉及一种用于基于加权聚合传输控制信号的技术。
背景技术
在传统多输入多输出(MIMO，Multiple Input Multiple Output)系统中，如图1示出传统MIMO一个示例，演进型基站(eNB，evolved Node B)主要优化服务地面上的用户设备(UE，User Equipment)。在垂直维度中，相同的窄波束被用于数据和控制传输，垂直波束通常指向地面上具有最多业务流的UE。在水平维度中，窄波束仅被用于数据传输，宽波束被用于控制传输以保证其在目标覆盖区域中的可靠性。然而，在三维MIMO(3D-MIMO)系统中，如图2示出3D-MIMO的一个示例，eNB需要覆盖地面和高楼层上的UE。为达到相同目标，eNB使用不同的垂直波束来服务位于不同楼层上的UE。为保证物理下行控制信道(PDCCH，Physical Downlink Control Channel)解码的可靠性，使用固定的垂直窄波束存在风险，特别是对于在高楼层上的UE。因此，eNB需要实现宽的垂直波束来用于PDCCH传输。该宽的垂直波束能够修补在垂直维度中由窄垂直波束引起的PDCCH覆盖漏洞，其也为每一eNB创建了合理的3D小区覆盖，以便eNB能够调整垂直窄波束以将数据传输至位于其PDCCH的3D覆盖区域中的任何UE。而现有的实现用于3D-MIMO系统中控制信道传输的宽波束方案，如在3GPP会议3GPP RAN1 R1-142860中的方案“On cell association in FD-MIMO systems”(关于FD MIMO系统中的小区关联)，虽然该方案在垂直维度中不存在关于PDCCH传输的覆盖漏洞，但问题是，10个天线元阵列的增益相对于单一天线元的增益减小，而且，覆盖漏洞的避免是以降低覆盖范围为代价的。因此，在3D-MIMO系统中，需要既能避免垂直维度覆盖漏洞又可增强3D-MIMO公共控制 信道的覆盖范围从而达到一定性能目标，如实现至少与2D-MIMO系统相匹配的性能的解决方案。
发明内容
本发明的一个目的是提供一种用于基于加权聚合传输控制信号的方法与设备。
根据本发明的一个方面，提供了一种在基站端用于基于加权聚合传输控制信号的方法，其中，该方法包括以下步骤：
a确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；
b根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。
根据本发明的另一方面，还提供了一种在用户设备端辅助用于基于加权聚合传输控制信号的方法，其中，该方法包括：
-接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；
其中，该方法还包括：
-接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
根据本发明的一个方面，还提供了一种用于基于加权聚合传输控制信号的基站，其中，该基站包括：
矢量确定装置，用于确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；
传输装置，用于根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。
根据本发明的另一个方面，还提供了一种辅助用于基于加权聚合传输控制信号的用户设备，其中，该用户设备包括：
第一接收装置，用于接收对应基站经公共控制信道端口所对应的多 天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；
其中，该用户设备还包括：
第二接收装置，用于接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
根据本发明的再一个方面，还提供了一种用于基于加权聚合传输控制信号的系统，其中，该系统包括如前述根据本发明一个方面的一种用于基于加权聚合传输控制信号的基站，以及如前述根据本发明另一个方面的一种辅助用于基于加权聚合传输控制信号的用户设备。
与现有技术相比，本发明的一个实施例通过确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量，以根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号，实现了3D-MIMO系统中公共控制信道的覆盖增强，解决了因引入2D平面阵列在3D-MIMO中的覆盖漏洞问题，而且本发明的天线阵列增益在整个EOD(垂直方向角)跨度内更均匀分布，增益也是显著的。
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，本发明的其它特征、目的和优点将会变得更明显：
图1示出传统MIMO一个示例的示意图；
图2示出3D-MIMO的一个示例的示意图；
图3示出根据本发明一个方面的一种用于基于加权聚合传输控制信号的基站的设备示意图；
图4示出不同方案(“3D UMa”和“3D UMi”)在不同配置下的累计分布函数的示意图；
图5示出相同聚合级别但不同时/频域重复的加权聚合的示意图；
图6示出具有半波长间隔的不同天线元的天线阵列波束增益图谱 的示意图；
图7示出通过基于本发明的方案来模拟每一PDCCH端口具有8个垂直天线元的天线阵列(即N＝8)得到的增益图谱的示意图；
图8示出根据本发明另一个方面的一种用于基于加权聚合传输控制信号的方法流程图。
附图中相同或相似的附图标记代表相同或相似的部件。
具体实施方式
下面结合附图对本发明作进一步详细描述。
图3示出根据本发明一个方面的一种用于基于加权聚合传输控制信号的基站1的设备示意图，其中，基站1包括矢量确定装置11和传输装置12。具体地，矢量确定装置11确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；传输装置12根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。在此，基站1是指移动通信系统中，连接固定部分与无线部分，并通过空中的无线传输与移动台相连的设备，其包括但不限于如Node B基站、eNB基站等。本领域技术人员应能理解上述基站仅为举例，其他现有的或今后可能出现的基站如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
在此，为更好地理解本发明，首先说明对3D-MIMO系统覆盖增强需求进行分析：
为确定3D-MIMO下PDCCH的覆盖增强，分别采用基于标准TR36.973中3GPP 3D-MIMO信道模型的UMa方案(即Urban Macro cell with high(outdoor/indoor)UE density，以下简称“3D UMa”)和UMi方案(即Urban Micro cell with high(outdoor/indoor)UE density，以下简称“3D UMi”)的两种方案进行了系统级模拟，一个方案采用每一端口具有单一天线元的配置1(即具有线性阵列的传统2D-MIMO)，另一个方案采用每一端口具有10个天线元的配置2(即具有平面阵列的3D-MIMO)。通过测量所有UE在给定端口如端口0的信号与干扰 加噪声比(SINR，Signal to Interference plus Noise Ratio)，得到如图4所示的不同方案和不同配置的累计分布函数(CDF，cumulative distribution function)，从而示出对应SINR的差别，从图4可以看出，配置1的每端口SINR比配置2的每端口SINR高3dB，这说明3D-MIMO系统的公共控制信道比2D-MIMO系统的公共控制信道糟糕3dB。原因是在2D-MIMO系统中，每一天线端口由多个天线元组成，而在3D-MIMO系统中，每一天线端口仅由一个天线元组成，因此具有低的组合增益。
在当前LTE规范中，用于PDCCH和EPDCCH(增强的PDCCH)的搜索空间
Figure PCTCN2014088066-appb-000001
知
Figure PCTCN2014088066-appb-000002
分别为每一聚合级别(aggregation level)L和子帧K定义了一组控制信道候选，3GPP TS 36.213中的搜索空间公式给出了属于每一候选的CCE(控制信道单元，Control Channel Element)或ECCE(增强的CCE，Enhanced Control Channel Element)。除L和K之外，RNTI(无线网络临时标识，Radio Network Temporary Identifier)和EPDCCH集的索引与大小均影响搜索空间表达。
为增强3D-MIMO的控制信道覆盖，简单的方法是在子带/时间窗口(如连续的几个RBs/子帧)中重复传输由相同搜索空间给出的CCEs/ECCEs。假设聚合级别为L，起始子帧为k0，且重复时间窗口扩展最大的K个子帧，直到子帧kend。为避免对于增强的覆盖UE的控制信道候选之间的冲突，在重复子带/时间窗口中的所有聚合的CCEs/ECCEs可共享相同的搜索空间，即对于a＝1，...，A，
Figure PCTCN2014088066-appb-000003
Figure PCTCN2014088066-appb-000004
其中A为频域(由传统的聚合级别L给出)和时域(由时域重复因子K给出)的聚合级别的总数量。因此，UE在加权的聚合子带/时间窗口中监测各聚合的CCE/ECCE资源块中的相同候选m。
为实现覆盖增强目标，UE需要总的CCE或ECCE聚合级别为A，若每一子帧的候选m中的聚合级别在整个K子帧上相加为A，如图5所示，对于各子帧中的聚合级别L，具有关系式A＝L·K，该关系式恒成立，在图5中，相同聚合级别但不同时/频域重复的加权聚合，不同颜色表示不同的权重。eNB可确定该三个参数中的两个并根据性能目 标确定另一个。
考虑到3D-MIMIO天线阵列——每一天线端口可由多个垂直天线元组成——的特性，为增强3D-MIMO公共控制信道的覆盖以实现性能目标，如至少与2D-MIMO系统的性能相匹配并避免垂直维度覆盖漏洞，本发明的方案实现了该性能目标。以下参照图3对本发明的一种用于基于加权聚合传输控制信号的基站1进行说明：
具体地，基站1矢量确定装置11确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量。
在此，所述各聚合级别权重矢量是指每一聚合级别均有对应的聚合级别权重矢量，不同聚合级别的聚合权重矢量可由以下公式(1)统一表达：
wa＝(wa，1，wa，2，...，wa，N)          (1)
其中，N为每一PDCCH或ePDCCH端口的天线元的数量，a表示聚合级别，wa为聚合级别a对应的聚合级别权重矢量。
在此，所述聚合级别权重矢量可以是离散傅里叶变换(DFT)矢量，也可以是3D-MIMO方案的下倾角(downtilt angle)矢量。
对于所述聚合级别权重矢量中的各权重分量，矢量确定装置11可通过以下公式(2)来确定：
Figure PCTCN2014088066-appb-000005
其中，wa，n表示所述多个天线元中第n个天线元第a个集合级别所对应的权重分量，d表示所述多天线元中天线元之间的间隔，N表示所述多天线元中天线元的数量，n表示所述多个天线元中的第n个天线元，λ表示拟经公共控制信道端口所对应的多天线元传输控制信号时所采用的波长，θa表示对应于聚合级别a的下倾角。
进而，矢量确定装置11可得到对应于聚合级别a的聚合级别权重矢量wa。例如，假设在一3D-MIMO系统中，PDCCH端口所对应的天线阵列包括4个天线元(即N＝4)，该系统中的基站1采用两个聚合级别分别为1和2，则根据公式(2)，对于聚合级别L＝2时，可得到w1，1、w1，2、 w1，3、w1，4共4个权重分量，相应地，对应的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)；类似地，对于聚合级别L＝2，矢量确定装置11也可根据公式(2)得到对应的4个权重分量w2，1、w2，2、w2，3、w2，4，相应地，对应的聚合级别权重矢量w2＝(w2，1，w2，2，w2，3，w2，4)。
本领域技术人员应能理解上述确定所述聚合级别权重矢量中的各权重分量的方式仅为举例，其他现有的或今后可能出现的确定所述聚合级别权重矢量中的各权重分量的方式如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
在此，可选择聚合级别权重矢量使得搜索空间
Figure PCTCN2014088066-appb-000006
或
Figure PCTCN2014088066-appb-000007
中信道控制信息的加权的聚合联合盲检性能可被优化。
对于搜索空间
Figure PCTCN2014088066-appb-000008
或
Figure PCTCN2014088066-appb-000009
中加权的聚合，确定权重标量集合W＝{w1，...，wA}，使得
Figure PCTCN2014088066-appb-000010
对于由N个垂直天线元组成的端口，第n个天线元第a个聚合级别的权重可根据对应于该聚合级别的给定的下倾角得到，即如上述公式(1)所示。
在公式(3)中，所有加权信号的合并功率应大于任何单个加权信号的功率，即。换句话说，为增强控制信道的联合检测性能，可确定W中单个矢量从而UE可以升高的功率接收控制信号的至少一个版本。另一方面，若任何加权的聚合信号具有升高的功率，本发明的加权聚合方案将优于传统的聚合/重复方案。
考虑标准TR 36.873中3GPP 3D-MIMO信道模型(UMa方案和UMi方案)中的UE分布模型(dropping model)，对于UMi方案，EOD在(70～120)度范围内，对于UMa方案，EOD在(90～120)度范围内。因此，对于UMi方案，EOD跨度为50度，对于UMa方案，EOD跨度为30度。图6以分别具有2、4、8个天线元的天线阵列为例，示出具有半波长间隔的不同天线元的天线阵列波束增益图谱，从图6可以看出，为对达到3dB覆盖增益，即对于图6中3dB增益处，对 于具有2个天线元的天线阵列，其波束增益均在0dB以下，对于具有4个天线元的天线阵列，其在3dB波束增益对应的角度范围为(-18度～+18度)，对于具有8个天线元的天线阵列，其在3dB波束增益处对应的角范围为(-11度～+11度)。因此，对于图6中3dB增益处，具有2、4、8个天线元(AE，Antenna Element)的天线阵列的最大角覆盖范围分别为0、36、22度。
接着，传输装置12根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号，如将所述各聚合级别权重矢量分别作用于所述控制信号，即将各聚合级别权重矢量分别与所述控制信号对应的矢量相乘，从而通过所述多天线元，将所述控制信号发送出去。
例如，对于搜索空间
Figure PCTCN2014088066-appb-000011
或
Figure PCTCN2014088066-appb-000012
的聚合的CCEs/ECCEs，将公式(1)的权重矢量wa＝(wa，1，wa，2，...，wa，N)应用于每一聚合的控制信号的信号
Figure PCTCN2014088066-appb-000013
其中，
Figure PCTCN2014088066-appb-000014
标记由搜索空间给出的CCEs或ECCEs中的从PDCCH或ePDCCH端口的多个天线发出的控制信号，从而通过PDCCH或ePDCCH端口的多个天线，发送出所述控制信号。
基站1的各个装置之间是持续不断工作的。具体地，矢量确定装置11持续确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；传输装置12持续根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。在此，本领域技术人员应能理解，所述“持续”是指基站1的各装置之间分别不断地进行各聚合级别权重矢量的确定，以及控制信息的传输，直至基站1在较长时间内停止确定所述各聚合级别权重矢量。
优选地，基站1还包括下倾角确定装置(未示出)。具体地，下倾角确定装置根据目标角度覆盖范围以及聚合级别应用信息，确定与每一聚合级别相对应的下倾角。在此，所述聚合级别应用信息是指系统所采用的聚合级别的数量信息，如采用了4个聚合级别，或者采用了2个聚合级别等。在此，所述目标角度覆盖范围是指需要覆盖的角度，如需要覆盖的垂直角度。
例如，假设在一3D-MIMO系统中，有4个聚合级别，如L1、L2、L3和L4，需要覆盖的垂直角度为(80～120)度，共40度范围区间，则下倾角确定装置可将该40度范围平均分配至每个聚合级别，即每个聚合级别需可覆盖10度区间，从而得到聚合级别L1、L2、L3和L4对应的下倾角分别为85、95、105、115度；或者，下倾角确定装置也可按照预定的方式确定每一聚合级别对应的下倾角，如假设预定聚合级别L1、L2需要覆盖5度区间，而L3和L4需要覆盖15度区间，则下倾角确定装置可得到聚合级别L1、L2、L3和L4对应的下倾角分别为82.5、87.5、97.5、112.5度。
本领域技术人员应能理解上述确定与每一聚合级别相对应的下倾角的方式仅为举例，其他现有的或今后可能出现的确定与每一聚合级别相对应的下倾角的方式如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
更优选地，基站1还包括基本确定装置(未示出)。具体地，基本确定装置根据所述多天线元中天线元的数量信息，以及所述目标角覆盖范围，确定对应的基本聚合级别。在此，所述基本聚合级别是指所需的角覆盖范围的最小数量的聚合级别。
对于搜索空间
Figure PCTCN2014088066-appb-000015
或
Figure PCTCN2014088066-appb-000016
中CCEs/ECCEs加权的聚合，为实现控制信道覆盖增益目标，关于每一PDCCH或EPDCCH端口的天线元数量、天线阵列图谱和所需的角覆盖范围的最小数量的聚合级别即所述基本聚合级别(Amin)可被确定。
例如，根据图6所示的天线阵列即3GPP 3D-MIMO中UE掉话模型(dropping model)，基本确定装置可得到：
1)对于UMi方案，若天线元数量N＝4，此时对应的最大角覆盖范围为36度，UMi方案的EOD跨度为50度，则
Figure PCTCN2014088066-appb-000017
类似地，若N＝8，则Amin＝3；
2)对于UMa方案，若N＝4，Amin＝1；若N＝8，Amin＝2。
在实际应用中，可使用比Amin大的K并将带来较大的覆盖增益但以牺牲更多的CCE/ECCE资源占用为代价。每一PDCCH或EPDCCH 端口的天线元数量可以是预定的系统参数。
在一个优选实施例中(参考图3)，其中，基站1还包括发送装置(未示出)，用户设备2包括第一接收装置(未示出)和第二接收装置(未示出)。具体地，基站1的传输装置12根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备；相应地，用户设备2的第一接收装置接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；基站1的发送装置将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检；相应地，用户设备2的第二接收装置接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
在此，用户设备2是指在移动通信设备中，终止来自或送至网络的无线传输，并将终端设备的能力适配到无线传输的部分，即用户接入移动网络的设备。其包括但不限于任何一种可与用户通过键盘、触摸板、或声控设备进行人机交互并能通过移动网络与基站进行信号的相互传送和接收来达到移动通信信号的传送的电子产品，例如平板电脑、智能手机、PDA、车载电脑等。在此，所述移动网络包括但不限于GSM、3G、LTE、Wi-Fi、WiMax、WCDMA、CDMA2000、TD-SCDMA、HSPA、LTD等。本领域技术人员应能理解上述用户设备仅为举例，其他现有的或今后可能出现的用户设备如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
具体地，基站1的传输装置12根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备。
例如，对于搜索空间
Figure PCTCN2014088066-appb-000018
或
Figure PCTCN2014088066-appb-000019
的聚合的CCEs/ECCEs，传输装置12将公式(1)的权重矢量wa＝(wa，1，wa，2，...，wa，N)应用于每一聚合的控制信号的信号
Figure PCTCN2014088066-appb-000020
其中，
Figure PCTCN2014088066-appb-000021
标记由搜索空间给出的CCEs或ECCEs中的从PDCCH或ePDCCH端口的多个天线发出的控制信号，从而通过PDCCH或ePDCCH端口的多个天线，发送 出所述控制信号。
相应地，用户设备2的第一接收装置接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的。
基站1的发送装置将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检。例如，假设在一3D-MIMO系统中，PDCCH端口所对应的天线阵列包括4个天线元(即N＝4)，该系统中的基站1采用两个聚合级别分别为1和2，则根据公式(2)，对于聚合级别L＝2时，可得到w1，1、w1，2、w1，3、w1，4共4个权重分量，相应地，对应的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)；类似地，对于聚合级别L＝2，矢量确定装置11也可根据公式(2)得到对应的4个权重分量w2，1、w2，2、w2，3、w2，4，相应地，对应的聚合级别权重矢量w2＝(w2，1，w2，2，w2，3，w2，4)，则发送装置将w1＝(w1，1，w1，2，w1，3，w1，4)和w2＝w2，1，w2，2，w2，3，w2，4)均发送至用户设备2。
相应地，用户设备2的第二接收装置接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。例如，接上例，用户设备2的第二接收装置接收到基站1发送的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)和w2＝(w2，1，w2，2，w2，3，w2，4)，则第二接收装置根据聚合权重矢量可确定对应的聚合级别，从而首先在该聚合级别所对应的CCEs/ECCEs中进行空间搜索，即首先在w1对应的聚合级别为1和w2对应的聚合级别为2进行空间搜索，从而加快盲检过程。
在此，本领域技术人员应当理解，在具体实施例中，基站1的传输装置12和发送装置可以是串行的执行，也可以是并行的执行；传输装置12和发送装置可以集成在一起，也可以是相互独立的模块。
在此，本领域技术人员应当理解，在具体实施例中，用户设备2的第一接收装置和第二接收装置可以是串行的执行，也可以是并行的执行；第一接收装置和第二接收装置可以集成在一起，也可以是相互独立的模块。
图7示出通过基于本发明的方案来模拟每一PDCCH端口具有8 个垂直天线元的天线阵列(即N＝8)得到的增益图谱，从图7可以看出，在需要EOD跨度为50度(对于3D UMi方案)且按照不存在覆盖漏洞(也就是说，所有UE均在3dB带宽内)的情况下，具有最小聚合级别A＝3的本发明的加权聚合方案(即图7中的情形4(加权聚合A＝3))可被采用，优选地，也可采用最小聚合级别A＝4的本发明的加权聚合方案(即图7中的情形3(加权聚合A＝4))。在其他情形中，一方面，相比与传统单一聚合A＝4的方案(即图7中的情形2(传统单一聚合))，本发明的天线阵列增益在整个EOD跨度内更均匀分布。另一方面，相对于无聚合(即图7中的情形1(无聚合))和单一天线元(即图7中的情形5(单一天线元))情形，本发明的增益亦是显著的。
图8示出根据本发明另一个方面的一种用于基于加权聚合传输控制信号的方法流程图。
其中，该方法包括步骤S1和步骤S2。具体地，在步骤S1中，基站1确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；在步骤S2中，基站1根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。在此，基站1是指移动通信系统中，连接固定部分与无线部分，并通过空中的无线传输与移动台相连的设备，其包括但不限于如Node B基站、eNB基站等。本领域技术人员应能理解上述基站仅为举例，其他现有的或今后可能出现的基站如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
在此，为更好地理解本发明，首先说明对3D-MIMO系统覆盖增强需求进行分析：
为确定3D-MIMO下PDCCH的覆盖增强，分别采用基于标准TR36.973中3GPP 3D-MIMO信道模型的UMa方案(以下简称“3D UMa”)和UMi方案(以下简称“3D UMi”)的两种方案进行了系统级模拟，一个方案采用每一端口具有单一天线元的配置1(即具有线性阵列的传统2D-MIMO)，另一个方案采用每一端口具有10个天线元的配置 2(即具有平面阵列的3D-MIMO)。通过测量所有UE在给定端口如端口0的信号与干扰加噪声比(SINR，Signal to Interference plus Noise Ratio)，得到如图4所示的不同方案和不同配置的累计分布函数(CDF，cumulative distribution function)，从而示出对应SINR的差别，从图4可以看出，配置1的每端口SINR比配置2的每端口SINR高3dB，这说明3D-MIMO系统的公共控制信道比2D-MIMO系统的公共控制信道糟糕3dB。原因是在2D-MIMO系统中，每一天线端口由多个天线元组成，而在3D-MIMO系统中，每一天线端口仅由一个天线元组成，因此具有低的组合增益。
在当前LTE规范中，用于PDCCH和EPDCCH(增强的PDCCH)的搜索空间
Figure PCTCN2014088066-appb-000022
和
Figure PCTCN2014088066-appb-000023
分别为每一聚合级别(aggregation level)L和子帧K定义了一组控制信道候选，3GPP TS 36.213中的搜索空间公式给出了属于每一候选的CCE(控制信道单元，Control Channel Element)或ECCE(增强的CCE)。除L和K之外，RNTI(无线网络临时标识，Radio Network Temporary Identity)和EPDCCH集的索引与大小均影响搜索空间表达。
为增强3D-MIMO的控制信道覆盖，简单的方法是在子带/时间窗口(如连续的几个RBs/子帧)中重复传输由相同搜索空间给出的CCEs/ECCEs。假设聚合级别为L，起始子帧为k0，且重复时间窗口扩展最大的K个子帧，直到子帧kend。为避免对于增强的覆盖UE的控制信道候选之间的冲突，在重复子带/时间窗口中的所有聚合的CCEs/ECCEs可共享相同的搜索空间，即对于a＝1，...，A，
Figure PCTCN2014088066-appb-000024
Figure PCTCN2014088066-appb-000025
其中A为频域(由传统的聚合级别L给出)和时域(由时域重复因子K给出)的聚合级别的总数量。因此，UE在加权的聚合子带/时间窗口中监测各聚合的CCE/ECCE资源块中的相同候选m。
为实现覆盖增强目标，UE需要总的CCE或ECCE聚合级别为A，若每一子帧的候选m中的聚合级别在整个K子帧上相加为A，如图5所示，对于各子帧中的聚合级别L，具有关系式A＝L·K，该关系式恒成立，在图5中，相同聚合级别但不同时/频域重复的加权聚合，不同 颜色表示不同的权重。eNB可确定该三个参数中的两个并根据性能目标确定另一个。
考虑到3D-MIMIO天线阵列——每一天线端口可由多个垂直天线元组成——的特性，为增强3D-MIMO公共控制信道的覆盖以实现性能目标，如至少与2D-MIMO系统的性能相匹配并避免垂直维度覆盖漏洞，本发明的方案实现了该性能目标。以下参照图8对本发明的一种用于基于加权聚合传输控制信号的方法进行说明：
具体地，在步骤S1中，基站1确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量。
在此，所述各聚合级别权重矢量是指每一聚合级别均有对应的聚合级别权重矢量，不同聚合级别的聚合权重矢量可由以下公式(4)统一表达：
wa＝(wa，1，wa，2，...，wa，N)         (4)
其中，N为每一PDCCH或ePDCCH端口的天线元的数量，a表示聚合级别，wa为聚合级别a对应的聚合级别权重矢量。
在此，所述聚合级别权重矢量可以是离散傅里叶变换(DFT)矢量，也可以是3D-MIMO方案的下倾角(downtilt angle)矢量。
对于所述聚合级别权重矢量中的各权重分量，在步骤S1中，基站1可通过以下公式(5)来确定：
Figure PCTCN2014088066-appb-000026
其中，wa，n表示所述多个天线元中第n个天线元第a个集合级别所对应的权重分量，d表示所述多天线元中天线元之间的间隔，N表示所述多天线元中天线元的数量，n表示所述多个天线元中的第n个天线元，λ表示拟经公共控制信道端口所对应的多天线元传输控制信号时所采用的波长，θa表示对应于聚合级别a的下倾角。
进而，在步骤S1中，基站1可得到对应于聚合级别a的聚合级别权重矢量wa。例如，假设在一3D-MIMO系统中，PDCCH端口所对应的天线阵列包括4个天线元(即N＝4)，该系统中的基站1采用两个聚合 级别分别为1和2，则根据公式(5)，对于聚合级别L＝2时，可得到w1，1、w1，2、w1，3、w1，4共4个权重分量，相应地，对应的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)；类似地，对于聚合级别L＝2，在步骤S1中，基站1也可根据公式(5)得到对应的4个权重分量w2，1、w2，2、w2，3、w2，4，相应地，对应的聚合级别权重矢量w2＝(w2，1，w2，2，w2，3，w2，4)。
本领域技术人员应能理解上述确定所述聚合级别权重矢量中的各权重分量的方式仅为举例，其他现有的或今后可能出现的确定所述聚合级别权重矢量中的各权重分量的方式如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
在此，可选择聚合级别权重矢量使得搜索空间
Figure PCTCN2014088066-appb-000027
或
Figure PCTCN2014088066-appb-000028
中信道控制信息的加权的聚合联合盲检性能可被优化。
对于搜索空间
Figure PCTCN2014088066-appb-000029
或
Figure PCTCN2014088066-appb-000030
中加权的聚合，确定权重标量集合W＝{w1，...，wA}，使得
Figure PCTCN2014088066-appb-000031
对于由N个垂直天线元组成的端口，第n个天线元第a个聚合级别的权重可根据对应于该聚合级别的给定的下倾角得到，即如上述公式(4)所示。
在公式(6)中，所有加权信号的合并功率应大于任何单个加权信号的功率，即。换句话说，为增强控制信道的联合检测性能，可确定W中单个矢量从而UE可以升高的功率接收控制信号的至少一个版本。另一方面，若任何加权的聚合信号具有升高的功率，本发明的加权聚合方案将优于传统的聚合/重复方案。
考虑标准TR 36.973中3GPP 3D-MIMO信道模型(UMa方案和UMi方案)中的UE分布模型(dropping model)，对于UMi方案，EOD在(70～120)度范围内，对于UMa方案，EOD在(90～120)度范围内。因此，对于UMi方案，EOD跨度为50度，对于UMa方案，EOD跨度为30度。图6以分别具有2、4、8个天线元的天线阵列为例，示出具有半波长间隔的不同天线元的天线阵列波束增益图谱，从图6 可以看出，为对达到3dB覆盖增益，即对于图6中3dB增益处，对于具有2个天线元的天线阵列，其波束增益均在0dB以下，对于具有4个天线元的天线阵列，其在3dB波束增益对应的角度范围为(-18度～+18度)，对于具有8个天线元的天线阵列，其在3dB波束增益处对应的角范围为(-11度～+11度)。因此，对于图6中3dB增益处，具有2、4、8个天线元(AE，Antenna Element)的天线阵列的最大角覆盖范围分别为0、36、22度。
接着，在步骤S2中，基站1根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号，如将所述各聚合级别权重矢量分别作用于所述控制信号，即将各聚合级别权重矢量分别与所述控制信号对应的矢量相乘，从而通过所述多天线元，将所述控制信号发送出去。
例如，对于搜索空间
Figure PCTCN2014088066-appb-000032
或
Figure PCTCN2014088066-appb-000033
的聚合的CCEs/ECCEs，将公式(4)的权重矢量wa＝(wa，1，wa，2，...，wa，N)应用于每一聚合的控制信号的信号
Figure PCTCN2014088066-appb-000034
其中，
Figure PCTCN2014088066-appb-000035
标记由搜索空间给出的CCEs或ECCEs中的从PDCCH或ePDCCH端口的多个天线发出的控制信号，从而通过PDCCH或ePDCCH端口的多个天线，发送出所述控制信号。
该方法的各个步骤之间是持续不断工作的。具体地，在步骤S1中，基站1持续确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；在步骤S2中，基站1持续根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。在此，本领域技术人员应能理解，所述“持续”是指该方法的各步骤之间分别不断地进行各聚合级别权重矢量的确定，以及控制信息的传输，直至基站1在较长时间内停止确定所述各聚合级别权重矢量。
优选地，该方法还包括步骤S3(未示出)。具体地，在步骤S3中，基站1根据目标角度覆盖范围以及聚合级别应用信息，确定与每一聚合级别相对应的下倾角。在此，所述聚合级别应用信息是指系统所采用的聚合级别的数量信息，如采用了4个聚合级别，或者采用了2个聚合级别等。在此，所述目标角度覆盖范围是指需要覆盖的角度，如需要覆盖 的垂直角度。
例如，假设在一3D-MIMO系统中，有4个聚合级别，如L1、L2、L3和L4，需要覆盖的垂直角度为(80～120)度，共40度范围区间，则在步骤S3中，基站1可将该40度范围平均分配至每个聚合级别，即每个聚合级别需可覆盖10度区间，从而得到聚合级别L1、L2、L3和L4对应的下倾角分别为85、95、105、115度；或者，在步骤S3中，基站1也可按照预定的方式确定每一聚合级别对应的下倾角，如假设预定聚合级别L1、L2需要覆盖5度区间，而L3和L4需要覆盖15度区间，则在步骤S3中，基站1可得到聚合级别L1、L2、L3和L4对应的下倾角分别为82.5、87.5、97.5、112.5度。
本领域技术人员应能理解上述确定与每一聚合级别相对应的下倾角的方式仅为举例，其他现有的或今后可能出现的确定与每一聚合级别相对应的下倾角的方式如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
更优选地，该方法还包括步骤S4(未示出)。具体地，在步骤S4中，基站1根据所述多天线元中天线元的数量信息，以及所述目标角覆盖范围，确定对应的基本聚合级别。在此，所述基本聚合级别是指所需的角覆盖范围的最小数量的聚合级别。
对于搜索空间
Figure PCTCN2014088066-appb-000036
或
Figure PCTCN2014088066-appb-000037
中CCEs/ECCEs加权的聚合，为实现控制信道覆盖增益目标，关于每一PDCCH或EPDCCH端口的天线元数量、天线阵列图谱和所需的角覆盖范围的最小数量的聚合级别即所述基本聚合级别(Amin)可被确定。
例如，根据图6所示的天线阵列即3GPP 3D-MIMO中UE掉话模型(dropping model)，在步骤S4中，基站1可得到：
1)对于UMi方案，若天线元数量N＝4，此时对应的最大角覆盖范围为36度，UMi方案的EOD跨度为50度，则
Figure PCTCN2014088066-appb-000038
类似地，若N＝8，则Amin＝3；
2)对于UMa方案，若N＝4，Amin＝1；若N＝8，Amin＝2。
在实际应用中，可使用比Amin大的K并将带来较大的覆盖增益但 以牺牲更多的CCE/ECCE资源占用为代价。每一PDCCH或EPDCCH端口的天线元数量可以是预定的系统参数。
在一个优选实施例中(参考图8)，其中，该方法还包括步骤S5(未示出)。具体地，在步骤S2中，基站1根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备；相应地，用户设备2接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；在步骤S5中，基站1将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检；相应地，用户设备2收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
在此，用户设备2是指在移动通信设备中，终止来自或送至网络的无线传输，并将终端设备的能力适配到无线传输的部分，即用户接入移动网络的设备。其包括但不限于任何一种可与用户通过键盘、触摸板、或声控设备进行人机交互并能通过移动网络与基站进行信号的相互传送和接收来达到移动通信信号的传送的电子产品，例如平板电脑、智能手机、PDA、车载电脑等。在此，所述移动网络包括但不限于GSM、3G、LTE、Wi-Fi、WiMax、WCDMA、CDMA2000、TD-SCDMA、HSPA、LTD等。本领域技术人员应能理解上述用户设备仅为举例，其他现有的或今后可能出现的用户设备如可适用于本发明，也应包含在本发明保护范围以内，并在此以引用方式包含于此。
具体地，在步骤S2中，基站1根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备。
例如，对于搜索空间
Figure PCTCN2014088066-appb-000039
或
Figure PCTCN2014088066-appb-000040
的聚合的CCEs/ECCEs，在步骤S2中，基站1将公式(4)的权重矢量wa＝(wa，1，wa，2，...，wa，N)应用于每一聚合的控制信号的信号
Figure PCTCN2014088066-appb-000041
其中，
Figure PCTCN2014088066-appb-000042
标记由搜索空间给出的CCEs或ECCEs中的从PDCCH或ePDCCH端口的多个天线发出的控制信号，从而通过PDCCH或ePDCCH端口的多个天线，发送出所述控制信号。
相应地，用户设备2接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的。
在步骤S5中，基站1将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检。例如，假设在一3D-MIMO系统中，PDCCH端口所对应的天线阵列包括4个天线元(即N＝4)，该系统中的基站1采用两个聚合级别分别为1和2，则根据公式(5)，对于聚合级别L＝2时，可得到w1，1、w1，2、w1，3、w1，4共4个权重分量，相应地，对应的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)；类似地，对于聚合级别L＝2，在步骤S1中，基站1也可根据公式(5)得到对应的4个权重分量w2，1、w2，2、w2，3、w2，4，相应地，对应的聚合级别权重矢量w2＝w2，1，w2，2，w2，3，w2，4)，则在步骤S5中，基站1将w1＝(w1，1，w1，2，w1，3，w1，4)和w2＝(w2，1，w2，2，w2，3，w2，4)均发送至用户设备2。
相应地，用户设备2接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。例如，接上例，在步骤S5中，用户设备2接收到基站1发送的聚合级别权重矢量w1＝(w1，1，w1，2，w1，3，w1，4)和w2＝(w2，1，w2，2，w2，3，w2，4)，则在步骤S5中，用户设备2根据聚合权重矢量可确定对应的聚合级别，从而首先在该聚合级别所对应的CCEs/ECCEs中进行空间搜索，即首先在w1对应的聚合级别为1和w2对应的聚合级别为2进行空间搜索，从而加快盲检过程。
在此，本领域技术人员应当理解，在具体实施例中，步骤S2和步骤S5可以是串行的执行，也可以是并行的执行。
需要注意的是，本发明可在软件和/或软件与硬件的组合体中被实施，例如，可采用专用集成电路(ASIC)、通用目的计算机或任何其他类似硬件设备来实现。在一个实施例中，本发明的软件程序可以通过处理器执行以实现上文所述步骤或功能。同样地，本发明的软件程序(包括相关的数据结构)可以被存储到计算机可读记录介质中，例如，RAM存储器，磁或光驱动器或软磁盘及类似设备。另外，本发明的一些步骤或 功能可采用硬件来实现，例如，作为与处理器配合从而执行各个步骤或功能的电路。
另外，本发明的一部分可被应用为计算机程序产品，例如计算机程序指令，当其被计算机执行时，通过该计算机的操作，可以调用或提供根据本发明的方法和/或技术方案。而调用本发明的方法的程序指令，可能被存储在固定的或可移动的记录介质中，和/或通过广播或其他信号承载媒体中的数据流而被传输，和/或被存储在根据所述程序指令运行的计算机设备的工作存储器中。在此，根据本发明的一个实施例包括一个装置，该装置包括用于存储计算机程序指令的存储器和用于执行程序指令的处理器，其中，当该计算机程序指令被该处理器执行时，触发该装置运行基于前述根据本发明的多个实施例的方法和/或技术方案。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明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发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化涵括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。此外，显然“包括”一词不排除其他单元或步骤，单数不排除复数。装置权利要求中陈述的多个单元或装置也可以由一个单元或装置通过软件或者硬件来实现。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 (15)

  1. 一种在基站端用于基于加权聚合传输控制信号的方法，其中，该方法包括以下步骤：
    a确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；
    b根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。
  2. 根据权利要求1所述的方法，其中，所述步骤a包括：
    -通过以下方式，确定每一所述聚合级别权重矢量中的各权重分量，以获得对应的所述聚合级别权重矢量；
    Figure PCTCN2014088066-appb-100001
    其中，表示所述多个天线元中第n个天线元第a个聚合级别所对应的权重分量，d表示所述多天线元中天线元之间的间隔，N表示所述多天线元中天线元的数量，n表示所述多个天线元中的第n个天线元，表示为传输所述控制信号所采用的波长，表示对应于聚合级别a的下倾角。
  3. 根据权利要求2所述的方法，其中，该方法还包括：
    -根据目标角度覆盖范围以及聚合级别应用信息，确定与每一聚合级别相对应的下倾角。
  4. 根据权利要求3所述的方法，其中，该方法还包括：
    -根据所述多天线元中天线元的数量信息，以及所述目标角覆盖范围，确定对应的基本聚合级别。
  5. 根据权利要求1至4中任一项所述的方法，其中，该方法还包括：
    -将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检。
  6. 根据权利要求1至4中任一项所述的方法，其中，所述步骤b包括：
    -根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备。
  7. 一种在用户设备端辅助用于基于加权聚合传输控制信号的方法， 其中，该方法包括：
    -接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；
    其中，该方法还包括：
    -接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
  8. 一种用于基于加权聚合传输控制信号的基站，其中，该基站包括：
    矢量确定装置，用于确定拟经公共控制信道端口所对应的多天线元传输的控制信号所对应的各聚合级别权重矢量；
    传输装置，用于根据所述各聚合级别权重矢量，通过所述多天线元，传输所述控制信号。
  9. 根据权利要求8所述的基站，其中，所述矢量确定装置用于：
    -通过以下方式，确定每一所述聚合级别权重矢量中的各权重分量，以获得对应的所述聚合级别权重矢量；
    Figure PCTCN2014088066-appb-100002
    其中，表示所述多个天线元中第n个天线元第a个聚合级别所对应的权重分量，d表示所述多天线元中天线元之间的间隔，N表示所述多天线元中天线元的数量，n表示所述多个天线元中的第n个天线元，表示为传输所述控制信号所采用的波长，表示对应于聚合级别a的下倾角。
  10. 根据权利要求9所述的基站，其中，该基站还包括：
    下倾角确定装置，用于根据目标角度覆盖范围以及聚合级别应用信息，确定与每一聚合级别相对应的下倾角。
  11. 根据权利要求10所述的基站，其中，该基站还包括：
    基本确定装置，用于根据所述多天线元中天线元的数量信息，以及所述目标角覆盖范围，确定对应的基本聚合级别。
  12. 根据权利要求8至11中任一项所述的基站，其中，该基站还包括：
    发送装置，用于将所述各聚合级别权重矢量发送至对应的用户设备，以用于DCI盲检。
  13. 根据权利要求8至11中任一项所述的基站，其中，所述传输装置用于：
    -根据所述各聚合级别权重矢量，通过所述多天线元，将所述控制信号发送至对应的用户设备。
  14. 一种辅助用于基于加权聚合传输控制信号的用户设备，其中，该用户设备包括：
    第一接收装置，用于接收对应基站经公共控制信道端口所对应的多天线元传输的控制信号，其中，所述控制信号是根据对应于所述多天线元的各聚合级别权重矢量传输的；
    其中，该用户设备还包括：
    第二接收装置，用于接收所述基站发送的所述各聚合级别权重矢量，以用于执行DCI盲检操作，获得与所述控制信号相对应的下行控制信息。
  15. 一种用于基于加权聚合传输控制信号的系统，其中，该系统包括权利要求8至13中任一项所述的基站，以及权利要求14所述的用户设备。
PCT/CN2014/088066 2014-09-30 2014-09-30 一种基于加权聚合传输控制信号的方法与设备 WO2016049934A1 (zh)

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