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WO2015042855A1 - 通信方法、基站和用户设备 - Google Patents

通信方法、基站和用户设备 Download PDF

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Publication number
WO2015042855A1
WO2015042855A1 PCT/CN2013/084423 CN2013084423W WO2015042855A1 WO 2015042855 A1 WO2015042855 A1 WO 2015042855A1 CN 2013084423 W CN2013084423 W CN 2013084423W WO 2015042855 A1 WO2015042855 A1 WO 2015042855A1
Authority
WO
WIPO (PCT)
Prior art keywords
beams
pilot signal
base station
pilot
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/084423
Other languages
English (en)
French (fr)
Inventor
杨晶
张劲林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP13894379.0A priority Critical patent/EP3046269B1/en
Priority to JP2016517546A priority patent/JP6306692B2/ja
Priority to CN201380001714.8A priority patent/CN103688474B/zh
Priority to PCT/CN2013/084423 priority patent/WO2015042855A1/zh
Publication of WO2015042855A1 publication Critical patent/WO2015042855A1/zh
Priority to US15/081,038 priority patent/US10009083B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0617Diversity 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/318Received signal strength
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868Hybrid systems, i.e. switching and combining
    • H04B7/088Hybrid systems, i.e. switching and combining using beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side

Definitions

  • the present invention relates to the field of communications, and in particular, to a communication method, a base station, and a user equipment. Background technique
  • MIMO Multiple-Input and Multiple-Output
  • the reference signal that is, the pilot signal
  • the reference signal is a known signal that is provided by the base station to the User Equipment (UE) for channel estimation or channel measurement by the UE.
  • UE User Equipment
  • the basic idea of pilot signal design is that each port corresponds to one pilot signal.
  • each antenna transmits a pilot signal omnidirectionally.
  • the base station needs to send pilot signals to the UE through all ports, thereby causing the base station to configure the UE.
  • the pilot signal is less flexible, and the UE also needs to measure the pilot signal for all ports, increasing the measurement complexity. Summary of the invention
  • the embodiments of the present invention provide a communication method, a base station, and a user equipment, which can improve the flexibility of configuring a pilot signal for a UE, and can reduce the measurement complexity of the pilot signal by the UE.
  • a communication method including: forming, by using an antenna weighting manner, m beams, where m is a positive integer greater than one; determining each of the m beams according to an uplink sounding signal of the user equipment UE Uplink receiving power; selecting n beams from the m beams according to uplink receiving power of each of the m beams, n is a positive integer, and n ⁇ m; through the n beams, The UE transmits a pilot signal.
  • the selecting, according to the uplink received power of each of the m beams, the n beams from the m beams including: from the m An optimal beam is selected among the plurality of beams, wherein an uplink received power of the optimal beam is the largest among the m beams; and the transmitting, by the n beams, a pilot signal to the UE, including: Passing the optimal beam, transmitting a pilot signal to the UE.
  • the method before the sending the pilot signal to the UE by using the optimal beam, the method further includes: The UE sends the first signaling, where the first signaling is used to indicate the configuration of the pilot signal corresponding to the optimal beam, the start time and the transmission period of sending the pilot signal, and the pilot signal is configured. And indicating a time-frequency resource occupied by the pilot signal.
  • the method further includes: The UE receives the first measurement information, where the first measurement information is obtained by the UE according to the first signaling, and the first measurement information is used according to the first measurement information.
  • the UE sends data.
  • the first measurement information includes a channel quality indicator CQI; or the first measurement information includes the CQI, and the following At least one: rank, precoding matrix indicating PMI.
  • the selecting, according to the uplink received power of each of the m beams, the n beams from the m beams including: according to the m The uplink received power of each beam in the beam determines the sum of the uplink received power of each of the q sets of beams, wherein the q sets of beams are obtained by dividing the m beams, each set of beams including n beams And selecting a group of beams from the q group of beams such that a sum of uplink received powers of the selected group of beams in the q group of beams is the largest.
  • the n beams of the selected one of the selected ones are configured corresponding to the n types of pilot signals, where the pilot signals are Configuring a time-frequency resource respectively occupied by the pilot signal;
  • Transmitting the pilot signal to the UE by using the n beams including: transmitting, by using n beams of the selected group of beams, to the UE according to the n types of pilot signal configurations Frequency signal.
  • the n beams in the selected one of the selected groups of beams are respectively configured according to the n types of pilot signals
  • the method further includes: sending, to the UE, second signaling, where the second signaling is used to indicate the configuration of the n types of pilot signals, and start sending the pilot signal Time and sending cycle.
  • the n beams in the selected one of the selected groups of beams are respectively configured according to the n pilot signals
  • the method further includes: receiving, by the UE, second measurement information, where the second measurement information includes, by the UE, the pilot signal measured according to the second signaling. a measurement result; determining a data transmission beam corresponding to the UE according to the selected group of beams and the second measurement information; and transmitting data to the UE by using the data transmission beam.
  • the determining, according to the selected one of a group of beams and the second measurement information, determining a data transmission beam corresponding to the UE includes: determining a spectral efficiency corresponding to the n measurement results respectively; determining an optimal measurement result among the n measurement results according to a spectral efficiency corresponding to the n measurement results, where the n The optimal measurement result in the measurement result corresponds to the highest spectral efficiency; the data transmission beam is determined according to the optimal measurement result and the selected set of beams.
  • each of the n measurement results includes a channel quality indicator CQI; or
  • Each of the measurement results includes the CQI, and at least one of the following: a rank, a precoding matrix indicating a PMI.
  • the pilot signal is a channel state information reference Signal CSI-RS.
  • a communication method including: receiving, by a base station, pilot signals that are sent by using n beams, where the n beams are based on uplink received power of each of the formed m beams from the base station. Selected among m beams, m is a positive integer greater than 1, n is a positive integer, and n ⁇ m; the pilot signal is measured.
  • the receiving, by the receiving, the pilot signal sent by the n beams includes: receiving, by the base station, a pilot signal that is sent by using an optimal beam, where The optimal received power of the optimal beam in each beam is the largest.
  • the method before the receiving, by the receiving, the pilot signal that is sent by the optimal beam, the method further includes: receiving, by the base station, a first signaling, where the first signaling is used to indicate a pilot signal configuration corresponding to the optimal beam, a start time and a sending period of sending the pilot signal, where the pilot signal is configured to indicate Describe the time-frequency resources occupied by the pilot signals;
  • the measuring the pilot signal includes: measuring the pilot signal according to the first signaling to obtain first measurement information.
  • the method further includes: sending the first measurement information to the base station; receiving, by the base station, the optimal beam and according to The data sent by the first measurement information.
  • the first measurement information includes a channel quality indicator CQI; or the first measurement The information includes the CQI, and at least one of the following: rank, precoding matrix indicating PML
  • the receiving, by the receiving, the pilot signal sent by the n beams includes: receiving, by the base station, a pilot signal that is sent by using n beams in a set of beams And the set of beams is selected by the base station from the q group beams obtained by the m beam splitting, each group of beams includes n beams, and uplink receiving of the group of beams in the q group of beams The sum of power is the largest.
  • the n beams of the set of beams are corresponding to the n types of pilot signal configurations, and the pilot signal configuration a time-frequency resource used to indicate that the pilot signal is occupied;
  • the receiving, by the base station, the pilot signal that is sent by using the n beams of the set of beams including: receiving, by the base station, respectively, by using n beams of the set of beams according to the n pilot configurations. Frequency signal.
  • the method includes: receiving, by the base station, second signaling, where the second signaling is used to indicate the configuration of the n types of pilot signals, a start time and a sending time of sending the pilot signal Cycle
  • the measuring the pilot signal comprises: measuring the pilot signal according to the second signaling to obtain n measurement results.
  • the method further includes: sending, to the base station, second measurement information, where the second measurement information includes the n measurement results; Receiving data sent by the base station through a data transmission beam, where the data transmission beam is determined by the base station according to the group of beams and the second measurement information.
  • each of the n measurement results includes a channel quality indicator CQI; or
  • Each of the measurement results includes the CQI, and at least one of the following: a rank, a precoding matrix indicating a PMI.
  • the pilot signal is a channel state information reference signal CSI-RS.
  • a base station including: a weighting unit, configured to form m beams by using antenna weighting, where m is a positive integer greater than 1, and a first determining unit, configured to perform uplink detection according to user equipment UE a signal, determining an uplink received power of each of the m beams; a selecting unit, configured to select n beams from the m beams according to an uplink received power of each of the m beams, where n is positive An integer, and n ⁇ m; a transmitting unit, configured to send, by using the n beams, a pilot signal to the UE.
  • the selecting unit is specifically configured to select an optimal beam from the m beams, where an optimal beam is uplinked in the m beams
  • the receiving power is the largest;
  • the sending unit is specifically configured to pass the optimal beam to the
  • the UE transmits a pilot signal.
  • the sending unit is further configured to: before the sending, by using the optimal beam, a pilot signal to the UE, Sending, to the UE, first signaling, where the first signaling is used to indicate a pilot signal configuration corresponding to the optimal beam, a start time and a transmission period of sending the pilot signal, and the pilot signal And configured to indicate a time-frequency resource occupied by the pilot signal.
  • the method further includes: a first receiving unit, where the first receiving unit is configured to pass the optimal beam at the sending unit After the pilot signal is sent to the UE, the first measurement information is received from the UE, where the first measurement information is that the UE measures the pilot signal according to the first signaling; a sending unit, configured to pass the optimal beam, according to the first measurement information, to the
  • the UE sends data.
  • the selecting unit is specifically configured to: determine, according to uplink receiving power of each of the m beams, uplink receiving of each group of beams in the q group of beams a sum of powers, wherein the q sets of beams are obtained by dividing the m beams, each group The beam includes n beams; a set of beams is selected from the q sets of beams such that a sum of uplink received power of the selected set of beams in the q sets of beams is maximized.
  • the n beams of the selected group of beams are corresponding to the n pilot signal configurations, and the pilot signals are Configuring a time-frequency resource for the pilot signal, where the transmitting unit is configured to respectively adopt n beams in the selected group of beams, and according to the n types of pilot signals
  • the UE transmits a pilot signal.
  • the sending unit is further configured to use, in the The n types of pilot signals are configured to send the second signaling to the UE, and the second signaling is used to indicate the n types of pilot signals, and send the guide.
  • the start time and the transmission period of the frequency signal are configured to use, in the The n types of pilot signals.
  • the second receiving unit and the second determining unit are further included, where the second receiving unit is configured to be used in the sending unit respectively After receiving the pilot signal to the UE according to the n types of pilot signal configurations, the second measurement information is received from the UE by using the n beams of the selected one of the set of beams, where the second measurement information includes And determining, by the second signaling, the n measurement results obtained by the UE according to the second signaling, where the second determining unit is further configured to: according to the selected group of beams and the second measurement information, Determining a data transmission beam corresponding to the UE; the sending unit is further configured to send data to the UE by using the data transmission beam.
  • the second determining unit is specifically configured to: determine a spectral efficiency corresponding to the n measurement results respectively; a spectral efficiency corresponding to each of the n measurement results, wherein an optimal measurement result is determined among the n measurement results, wherein the optimal measurement result corresponds to a maximum spectral efficiency among the n measurement results;
  • the data transmission beam is determined by an optimal measurement result and the selected set of beams.
  • a fourth aspect provides a user equipment, including: a receiving unit, configured to receive a pilot signal sent by a base station through n beams, where the n beams are uplinks of each of the formed m beams according to the base station The received power is selected from the m beams, m is a positive integer greater than 1, n is a positive integer, and n ⁇ m; and a measuring unit is configured to measure the pilot signal.
  • the receiving unit is specifically used to And receiving, by the base station, a pilot signal that is sent by using an optimal beam, wherein an uplink received power of the optimal beam is the largest among the m beams.
  • the receiving unit is further configured to receive, before the receiving base station sends the pilot signal by using an optimal beam
  • the first signaling sent by the base station where the first signaling is used to indicate a pilot signal configuration corresponding to the optimal beam, a start time and a sending period of sending the pilot signal, and the pilot signal
  • the measurement unit is configured to perform measurement on the pilot signal according to the first signaling to obtain first measurement information.
  • the method further includes: a sending unit, where the sending unit is configured to send the first measurement information to the base station; The unit is further configured to receive data that is sent by the base station by using the optimal beam and according to the first measurement information.
  • the receiving unit is specifically configured to receive a pilot signal that is sent by the base station by using n beams in a set of beams, where the group of beams is The base station selects from the q group beams obtained by the m beam divisions, each group of beams includes n beams, and the sum of uplink reception powers of the group of beams in the q group beams is the largest.
  • the n beams in the set of beams are configured corresponding to n pilot signals, and the pilot signal configuration is configured.
  • a receiving unit configured to receive, by the receiving unit, a pilot that is sent by the n beams in the set of beams according to the n types of pilot configurations. signal.
  • the receiving unit is further configured to: pass, by the receiving, the base station, respectively, n beams in the set of beams Before receiving the pilot signal sent by the n pilot configurations, receiving the second signaling sent by the base station, where the second signaling is used to indicate the configuration of the n pilot signals, and send the pilot signal a starting time and a sending period; the measuring unit is specifically configured to measure the pilot signal according to the second signaling to obtain n measurement results.
  • the method further includes: a sending unit, where the sending unit is configured to send, to the base station, second measurement information, where the second measurement The information includes the n measurement results; the receiving unit is further configured to receive data sent by the base station by using a data transmission beam, where the data transmission beam is the group according to the group The beam and the second measurement information are determined.
  • the uplink received power of each of the m beams is determined according to the uplink sounding signal of the UE, and n beams are selected from the m beams according to the uplink received power of each of the m beams.
  • the UE transmits the pilot signal instead of transmitting the pilot signal to the UE through all the beams, thereby improving the flexibility of configuring the pilot signal for the UE and reducing the measurement complexity of the pilot signal by the UE.
  • FIG. 1 is a schematic flow chart of a communication method in accordance with one embodiment of the present invention.
  • FIG. 2 is a schematic flow chart of a communication method according to another embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an example of a scenario in which an embodiment of the present invention is applicable.
  • FIG. 4 is a schematic diagram of another example of a scenario in which an embodiment of the present invention may be applied.
  • FIG. 5 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • Figure 6 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a UE according to another embodiment of the present invention. detailed description
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • UE User Equipment
  • MT mobile terminal
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • UE User Equipment
  • MT mobile terminal
  • RAN Radio Access Network
  • the user equipment may be a mobile terminal, such as a mobile telephone (or "cellular" telephone) and a computer with a mobile terminal, for example, a mobile device that may be portable, pocket, handheld, computer built, or in-vehicle.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved Node B (eNB or e-NodeB) in LTE.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB evolved Node B
  • e-NodeB evolved Node B
  • FIG. 1 is a schematic flow chart of a communication method in accordance with one embodiment of the present invention. The method of Figure 1 is performed by a base station.
  • m beams are formed, and m is a positive integer greater than 1.
  • a base station can form m differently directed beams by antenna weighting.
  • Each beam can correspond to one or more ports.
  • each beam can correspond to one port, and then m beams can correspond to m ports.
  • each beam can correspond to two ports, then m beams can correspond to mx2 ports.
  • the base station can receive the uplink detection of the UE through the port corresponding to each beam.
  • the (Sounding) signal determines the uplink received power of the beam according to the uplink sounding signal received by the port corresponding to each beam.
  • n beams from the m beams where n is a positive integer, and n ⁇ m.
  • the base station can select n beams from m beams by comparing the magnitude of the uplink received power of each beam.
  • the base station may send a pilot signal to the UE by using a port corresponding to each of the n beams.
  • a pilot signal design scheme that is, each pilot port maps a pilot signal
  • the base station needs to transmit a pilot signal to the UE through all the ports corresponding to the m beams, so that the base station is flexible when configuring the pilot signal for the UE. Poor sex.
  • the measurement needs to be passed.
  • the pilot signals transmitted by all the ports of the m beams have a large measurement complexity.
  • the base station determines the uplink receiving power of each of the m beams according to the uplink sounding signal of the UE, and selects the port corresponding to the n beams of the m beams according to the uplink receiving power of the m beams to send to the UE.
  • the pilot signal can sufficiently improve the flexibility of the base station to configure the pilot signal for the UE.
  • n is smaller than m, it is not necessary for the UE to measure the pilot signals transmitted by all the beams, so that the measurement complexity can be reduced.
  • the uplink received power of each of the m beams is determined according to the uplink sounding signal of the UE, and n beams are selected from the m beams according to the uplink received power of each of the m beams.
  • the UE transmits the pilot signal instead of transmitting the pilot signal to the UE through all the beams, thereby improving the flexibility of configuring the pilot signal for the UE and reducing the measurement complexity of the pilot signal by the UE.
  • each of the m beams is used.
  • the uplink received power of the beams selects n beams from the m beams, and transmits pilot signals to the UE through n beams instead of transmitting pilot signals to the UE through all beams, thereby enabling pilots in a large-scale antenna system. Signal transmission.
  • the pilot signal described above may be a pilot signal used only for channel measurement.
  • the base station does not need to transmit omnidirectionally, and therefore can transmit through one or more of the beams.
  • the pilot signal may be a Channel State Information-Reference Signal (CSI-RS).
  • CSI-RS Channel State Information-Reference Signal
  • the base station may obtain the uplink received power of each beam after a period of time.
  • the base station can set a time domain counter to count the uplink received power of each beam within the window length of the time domain filtering.
  • the uplink received power of each beam can be replaced by the average uplink received power of each beam.
  • the base station may determine the average uplink received power of each beam according to the following steps:
  • the base station can receive the uplink sounding signal of the UE through all ports corresponding to the m beams.
  • the base station may perform channel estimation based on the uplink sounding signal at each port to determine a corresponding channel coefficient of each port on the subcarrier. For example, for the jth port corresponding to the i th beam of the m beams, the estimated channel coefficient on the subcarrier k may be jk .
  • the base station can calculate the average power of the channel coefficients of each beam on all ports and all subcarriers.
  • the number of all ports corresponding to each beam; N sub can represent all subcarriers.
  • the base station can filter the average uplink received power of each beam in the time domain. Accordingly, the time domain counter is incremented by one.
  • the base station can determine whether the time domain counter reaches the window length of the time domain filtering. If the time domain counter does not reach the window length of the time domain filtering, the base station returns to perform the above step A).
  • the average uplink received power of each of the m beams in the period may be used as the uplink received power of the m beams, and then used for the processing of step 130.
  • the base station may select one or more beams from the m beams based on the uplink received power of the m beams to transmit a pilot signal to the UE.
  • the process by which the base station selects one of the m beams to transmit a pilot signal to the UE will be described in detail below.
  • the base station selects an optimal beam from the m beams, wherein an uplink received power of the optimal beam among the m beams is the largest. Accordingly, in step 140, the base station can transmit a pilot signal to the UE through the optimal beam.
  • the base station may select one of the m beams with the largest uplink received power as the optimal beam. For example, the base station can compare the average uplink received power of each of the m beams to select the optimal beam with the largest average received power. Then, the pilot signal is transmitted to the UE through the optimal beam. It can be seen that, in this embodiment, the base station transmits the pilot signal to the UE through one of the m beams, instead of transmitting the pilot signal through all the beams, thereby reducing the guide. The overhead of the frequency signal.
  • the base station may send the first signaling to the UE, where the first signaling is used to indicate the pilot signal configuration corresponding to the optimal beam, The start time and the transmission period of the pilot signal are transmitted, and the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the base station may use different pilot signal configurations on each beam to transmit pilot signals.
  • the pilot signal configuration indicates the time-frequency resource occupied by the pilot signal. Therefore, the pilot signals transmitted by the base station through the respective beams occupy different time-frequency resources.
  • each subframe supports up to 20 CSI-RS configurations.
  • m is greater than 20
  • the base station can pass 24 subframes respectively.
  • the beams transmit CSI-RS.
  • the transmission period of the ⁇ pilot signal is 10 ms, and usually 1 subframe is 1 ms, that is, the transmission period of the pilot signal is 10 subframes.
  • the pilot signal can be transmitted through 2 subframes in each cycle, and the subframes on which the pilot signals are transmitted can be subframes 1, 2, 11, 12, 21, and 22, and so on, and so on.
  • the base station may send the CSI-RS through the 20 beams on the subframe 1, and transmit the CSI-RS through the remaining 4 beams on the subframe 2.
  • the base station can transmit CSI-RS through 20 beams on subframe 11 and CSI-RS through 4 beams on subframe 12. And so on.
  • the base station Before the base station sends the pilot signal to the UE, the base station needs to notify the UE of the time-frequency resource occupied by the pilot signal, the start time and the transmission period of the transmitted pilot signal. Specifically, the base station may indicate, by using the first signaling, the pilot signal configuration corresponding to the optimal beam, the start time and the transmission period of the transmitted pilot signal.
  • the first signaling may be higher layer signaling. In this way, the UE may measure the pilot signal according to the transmission period from the start time on the time-frequency resource indicated by the pilot signal configuration.
  • the base station may further receive first measurement information from the UE, where the first measurement information is that the UE measures the pilot signal according to the first signaling. get.
  • the base station can then transmit data to the UE according to the first measurement information through the optimal beam.
  • the base station may use the optimal beam as the data transmission beam corresponding to the UE, and send the data to the UE based on the first measurement information by using the optimal beam.
  • the first measurement information may include a Channel Quality Indication (CQI).
  • CQI Channel Quality Indication
  • the first measurement information may include a CQI, and at least one of the following: a rank, a precoding matrix indicator (PMI).
  • the UE may determine whether to include the rank or PMI in the measurement information according to the transmission mode.
  • the base station selects one of the m beams to transmit a pilot signal to the UE.
  • the base station may also select a plurality of beams from the m beams to transmit pilot signals to the UE, which will be described in detail below.
  • the base station may determine, according to the uplink received power of each of the m beams, a sum of uplink received power of each group of the q groups of beams, where the q group of beams is For each of the m beam splits, each set of beams includes n beams.
  • the base station may select a group of beams from the q group of beams such that the sum of the uplink received powers of the selected one of the q group beams is the largest.
  • the base station may group m beams and divide them into q group beams, where each group of beams includes n beams.
  • the base stations can be grouped according to the direction of the beams such that the spatial separation between the groups is sufficiently far apart.
  • the spatial separation between groups can be determined according to actual needs, for example, based on transmission performance and overhead of pilot signals.
  • the base station can calculate the sum of the uplink received power of each group of beams in the q group beam. For example, the base station can sum the average uplink received power of the n beams in each group of beams to obtain the sum of the uplink received power of each group of beams. The base station can compare the sum of the uplink received powers of the respective groups of beams, and select a group of beams with the largest sum of uplink received powers. It can be seen that the base station selects a group of beams from each group of beams to transmit a pilot signal to the UE instead of transmitting the pilot signal through all the beams, thereby saving the overhead of the pilot signal.
  • the n beams in the selected group of beams are in one-to-one correspondence with the n pilot signal configurations, where the n pilot signal configurations are respectively used to indicate time-frequency resources occupied by the pilot signals.
  • the base station may transmit a pilot signal to the UE according to n pilot signal configurations through n beams of the selected set of beams, respectively.
  • the base station may send, by using n beams in the set of beams, n kinds of pilot signals to the UE on the time-frequency resources indicated by the n types of pilot signal configurations.
  • the base station may send the second signaling to the UE before sending the pilot signal to the UE according to the n pilot signals configured by n beams in the selected group of beams, respectively.
  • the second signaling may be used to indicate n kinds of pilot signal configurations, a start time and a transmission period of transmitting a pilot signal.
  • the base station may use different pilot signal configurations on each beam to transmit pilot signals.
  • the pilot signal configuration indicates the time-frequency resource occupied by the pilot signal. Therefore, the pilot signals transmitted by the base station through the respective beams occupy different time-frequency resources.
  • each subframe supports up to 20 CSI-RS configurations.
  • m is greater than 20
  • the support divides 24 beams into 4 groups.
  • the base station can transmit the CSI-RS through 4 sets of beams in 2 subframes respectively. For example, 4 sets the period for transmitting the pilot signal to 10 ms, that is, 10 subframes.
  • the pilot signal can be transmitted through 2 subframes in each cycle.
  • the subframes for transmitting the pilot signals may be subframes 1, 2, 11, 12, 21, and 22, and so on, and so on.
  • the base station may transmit the CSI-RS through the first group and the second group beam on the subframe 1, and transmit the CSI through the third group and the fourth group beam on the subframe 2.
  • the base station may transmit the CSI-RS through the first group and the second group beam on the subframe 11, and transmit the CSI-RS through the third group and the fourth group beam on the subframe 12. And so on.
  • the base station Before transmitting the pilot signal, the base station needs to notify the UE of the time-frequency resources occupied by the various pilot signals, the starting time of transmitting the pilot signal, and the sending period. Specifically, the base station may indicate, to the UE, n types of pilot signal configurations, a start time, and a transmission period by using the second signaling. In this way, the UE can measure the pilot signal according to the transmission period from the start time on the time-frequency resources indicated by the n kinds of pilot signals.
  • the second signaling may be higher layer signaling.
  • the base station may receive the second measurement information from the UE after transmitting the pilot signal to the UE according to the n pilot signals configured by n beams in the selected group of beams.
  • the second measurement information includes n measurement results obtained by the UE measuring the pilot signal on the time-frequency resources indicated by the n kinds of pilot signal configurations.
  • the base station may determine, according to the selected group of beams and the second measurement information, a data transmission beam corresponding to the UE. The base station can then transmit data to the UE through the data transmission beam.
  • the time-frequency resources indicated by the n kinds of pilot signal configurations are mutually offset, so that the UE can perform measurement on the time-frequency resources indicated by the n kinds of pilot signal configurations, and correspondingly obtain n measurement results.
  • the base station may determine a spectral efficiency corresponding to n measurement results of >3 ⁇ 4 on the UE.
  • the base station can determine the optimal measurement result among the n measurement results according to the spectral efficiency corresponding to the n measurement results, wherein the optimal measurement result corresponding to the n measurement results is the largest.
  • the base station can then determine the data transmission beam based on the optimal measurement and the selected set of beams.
  • each of the n measurement results may include
  • each measurement may include a CQI, and at least one of the following: rank, PMI.
  • the base station may calculate the spectral efficiency of each of the n measurement results reported by the UE according to the CQI and the rank. If the rank is not included in the measurement result, the base station can default the rank to rankl, thereby obtaining the spectral efficiency corresponding to each measurement result.
  • the base station can select an optimal measurement result with the highest spectral efficiency from among the n measurement results. Since each measurement corresponds to a pilot signal configuration, and the pilot signal configuration is also corresponding to the beam, each measurement corresponds to one beam. When the optimal measurement result is determined, the beam corresponding to the optimal measurement result is determined as the data transmission beam in the selected one of the selected groups to transmit data to the UE.
  • FIG. 2 is a schematic flow chart of a communication method according to another embodiment of the present invention. The method of Figure 2 is performed by the UE.
  • n beams Receive a pilot signal that is sent by the base station by using n beams.
  • the n beams are selected by the base station according to the uplink received power of each of the formed m beams, and m is a positive integer greater than 1.
  • n is a positive integer, and n ⁇ m.
  • the measurement complexity can be reduced.
  • the base station transmits the pilot signal through n beams of the m beams, which can improve the flexibility of configuring the pilot signal for the UE.
  • the pilot signal may be a CSI-RS.
  • the UE may receive a pilot signal that is sent by the base station by using an optimal beam, where an uplink received power of the optimal beam is the largest among the m beams.
  • the UE may receive the first signaling sent by the base station before receiving the pilot signal sent by the base station by using the optimal beam, where the first signaling is used to indicate the pilot signal corresponding to the optimal beam.
  • the start time and the transmission period of the pilot signal are configured and transmitted, and the pilot signal is configured to indicate a time-frequency resource occupied by the pilot signal.
  • the UE may perform measurement on the pilot signal according to the first signaling to obtain first measurement information.
  • the UE may measure the pilot signal according to the transmission period from the start time on the time-frequency resource indicated by the pilot signal configuration corresponding to the optimal beam, thereby obtaining corresponding measurement information.
  • the UE may send the first measurement information to the base station, and may receive the data that the base station transmits through the optimal beam and according to the first measurement information.
  • the first measurement information may include a CQI.
  • the first test The amount information may include a CQI, and at least one of the following: rank, PMI.
  • the process of the UE receiving the pilot signal transmitted by the base station through one beam has been described above, and the corresponding measurement and reception of data are described.
  • the process in which the UE receives the pilot signals transmitted by the base station through the plurality of beams will be described below, and the corresponding measurement and the process of receiving the data will be described.
  • the UE may receive a pilot signal that is sent by the base station through n beams in a set of beams, where the set of beams is a q obtained by dividing the base station from m beams. Selected in the group beam, each group of beams includes n beams, and the sum of uplink received powers of a group of beams in the q group beam is the largest.
  • the n beams in the set of beams are configured corresponding to the n pilot signals, and the pilot signals are configured to indicate time-frequency resources occupied by the pilot signals.
  • the UE may receive pilot signals transmitted by the base station through n pilot beams in a set of beams according to n pilot configurations.
  • the base station may send n kinds of pilot signals to the UE on the time-frequency resources indicated by the n types of pilot signal configurations by using n beams, respectively.
  • the UE may receive the second signaling sent by the base station before the receiving base station configures the transmitted pilot signals according to the n pilot signals by using n beams in the set of beams, respectively.
  • the signaling is used to indicate n kinds of pilot signal configurations, a start time and a transmission period for transmitting the pilot signal.
  • the UE may measure the pilot signal according to the second signaling to obtain n measurement results.
  • the UE may measure the pilot signal according to the transmission period from the start time on the time-frequency resources respectively indicated by the n types of pilot signal configurations.
  • the UE may send second measurement information to the base station, where the second measurement information includes n measurement results, and may receive data sent by the base station through the data transmission beam, where the data transmission beam is a group according to a group. The beam and the second measurement information are determined.
  • FIG. 3 is a schematic diagram of an example of a scenario in which an embodiment of the present invention is applicable.
  • the base station can receive the uplink sounding signals of the UE through the 32 ports, and determine the average uplink receiving power of the beam 0 to the beam 15 according to the uplink sounding signals of the UE.
  • the specific process can be referred to the process of the embodiment of Fig. 1.
  • the base station can then compare the average uplink received power of beam 0 to beam 15 to select a beam with the largest average received power of the uplink as the beam for transmitting the pilot signal.
  • the beam 2 will be described as an example.
  • the base station may send high layer signaling to the UE before transmitting the pilot signal, and indicate to the UE the pilot signal configuration corresponding to the beam 2, the start time of transmitting the pilot signal, and the transmission period.
  • the UE may measure the pilot signal according to the start time and the transmission period on the time-frequency resource indicated by the pilot signal corresponding to the beam 2, obtain measurement information, and send the measurement information to the base station.
  • the base station can use the beam 2 as the data transmission beam corresponding to the UE, pass the beam 2, and send data to the UE according to the measurement information.
  • the base station needs to transmit the pilot signal to the UE through 32 ports, which not only causes the base station to have poor flexibility in configuring the pilot signal for the UE, but also causes the UE to measure the pilot signal with high complexity.
  • the base station may select one beam from the 16 beams to transmit the pilot signal, that is, select two ports from the 32 ports to transmit the pilot signal, thereby improving the flexibility of configuring the pilot signal for the UE. And can reduce the measurement complexity of the pilot signal to the UE.
  • the existing pilot design scheme does not support port 32.
  • the base station can select one beam from 16 beams to transmit a pilot signal, that is, select two ports from 32 ports to send.
  • the pilot signal which can still follow the pilot pattern and codebook supported by the protocol, can realize the transmission of the pilot signal in the large-scale antenna system.
  • FIG. 4 is a schematic diagram of another example of a scenario in which an embodiment of the present invention may be applied.
  • each beam can correspond to 2 ports, then 16 beams correspond to 32 ports.
  • the base station can divide 16 beams into 4 groups, and each 4 adjacent beams are a group. As shown in Figure 4 It can be shown that these four groups can be represented as group 0, group 1, group 2 and group 3.
  • the base station can receive the uplink sounding signals of the UE through the 32 ports, and determine the average uplink receiving power of the beam 0 to the beam 15 according to the uplink sounding signals of the UE.
  • the specific process can be referred to the process of the embodiment of Fig. 1.
  • the base station can separately calculate the sum of the average uplink received powers of the beams of each group. For example, the average uplink received power of beam 0 to beam 3 is added to obtain the sum of the average uplink received power of group 0.
  • the base station can compare the sum of the average uplink received powers of each of group 0 to group 3, select the largest group after the average uplink received power, and then transmit pilot signals to the UE through the respective beams in the group.
  • the pilot signal configuration corresponding to each beam is different. That is, the configuration of the pilot signals corresponding to the respective beams in the group is different, and the configuration of the pilot signals corresponding to the groups is also different, that is, the configuration of the 16 pilot signals corresponding to the 16 beams. Therefore, beam 4 to beam 7 correspond to four pilot signal configurations, respectively. That is, the base station can transmit four kinds of pilot signals to the UE through the four pilot signal configurations through the beam 4 to the beam 7. It can also be understood that the base station sends four kinds of pilot signals to the UE through the eight ports in the group 2, and the two ports corresponding to each beam correspond to one pilot signal configuration.
  • the base station Before transmitting the pilot signal, the base station may send high-level signaling to the UE, and indicate to the UE four types of pilot signal configurations corresponding to the beam 4 to the beam 7, the starting time of transmitting the pilot signal, and the sending period.
  • the UE may measure the pilot signal according to the start time and the transmission period on the time-frequency resources respectively indicated by the four types of pilot signals.
  • the time-frequency resources indicated by the four types of pilot signal configurations are not referred to as four measurement points, namely, measurement point 0, measurement point 1, measurement point 2, and measurement point 3.
  • the measurement point 0 corresponds to the beam 4
  • the measurement point 1 corresponds to the beam 5
  • the measurement point 2 corresponds to the beam 6
  • the measurement point 4 corresponds to the beam 7.
  • the start time and the transmission period corresponding to each measurement point are also the same.
  • the UE measures the four types of pilot signals transmitted by the beams 4 to 7 at four measurement points, and obtains four measurement results, which are reported to the base station.
  • the base station can obtain the spectral efficiency corresponding to the four measurement results according to the four measurement results. Compare the spectral efficiencies corresponding to the four measurements and select the one with the highest spectral efficiency. And the beam corresponding to the selected measurement result can be determined. For example, if the measurement result obtained by the measurement point 1 is the highest, the beam corresponding to the measurement result is the beam 5. Then, The base station can transmit data to the UE using beam 5.
  • the base station needs to transmit the pilot signal to the UE through 32 ports, which not only causes the base station to have poor flexibility in configuring the pilot signal for the UE, but also causes the UE to measure the pilot signal with high complexity.
  • the base station may select a partial beam from the 16 beams to transmit the pilot signal, that is, select a part of the 32 ports to transmit the pilot signal, thereby improving the flexibility of configuring the pilot signal for the UE. And can reduce the measurement complexity of the pilot signal to the UE.
  • the existing pilot design scheme does not support port 32.
  • the base station can select one beam from 16 beams to transmit a pilot signal, that is, select two ports from 32 ports to send.
  • the pilot signal which can still follow the pilot pattern and codebook supported by the protocol, can realize the transmission of the pilot signal in the large-scale antenna system.
  • FIG. 5 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • the base station 500 of FIG. 5 includes a weighting unit 510, a first determining unit 520, a selecting unit 530, and a transmitting unit 540.
  • the weighting unit 510 forms m beams by means of antenna weighting, and m is a positive integer greater than one.
  • the first determining unit 520 determines the uplink received power of each of the m beams according to the uplink sounding signal of the user equipment UE.
  • the selecting unit 530 selects n beams from the m beams based on the uplink received power of each of the m beams, n is a positive integer, and n ⁇ m.
  • the transmitting unit 540 transmits a pilot signal to the UE through n beams.
  • the uplink received power of each of the m beams is determined according to the uplink sounding signal of the UE, and n beams are selected from the m beams according to the uplink received power of each of the m beams.
  • the UE transmits the pilot signal instead of transmitting the pilot signal to the UE through all the beams, thereby improving the flexibility of configuring the pilot signal for the UE and reducing the measurement complexity of the pilot signal by the UE.
  • the selecting unit 530 may select an optimal beam from the m beams, wherein an uplink received power of the optimal beam is the largest among the m beams.
  • the transmitting unit 540 can transmit a pilot signal to the UE through the optimal beam.
  • the sending unit 540 may further send the first signaling to the UE before sending the pilot signal to the UE by using the optimal beam, where the first signaling is used to indicate the pilot corresponding to the optimal beam.
  • the signal configuration, the start time and the transmission period of the transmitted pilot signal, and the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the base station 500 may further include a first receiving unit 550.
  • the receiving unit 550 receives the first measurement information from the UE, where the first measurement information is obtained by the UE according to the first signaling.
  • the sending unit 540 can also send data to the UE according to the first measurement information by using an optimal beam.
  • the first measurement information may include a CQI.
  • the first measurement information may include a CQI, and at least one of the following: rank, PMI.
  • the selecting unit 530 may determine, according to the uplink receiving power of each of the m beams, a sum of uplink receiving powers of each group of the q groups of beams, where the q group beams are m pairs. According to the beam splitting, each group of beams includes n beams, and then a group of beams can be selected from the q group beams, so that the sum of the uplink received powers of the selected one of the q group beams is the largest.
  • the n beams in the selected group of beams may be in one-to-one correspondence with the n types of pilot signals, and the pilot signal configuration is used for the time-frequency resources occupied by the pilot signals, respectively.
  • Transmitting unit 540 can transmit pilot signals to the UE according to n pilot signal configurations through n beams of the selected set of beams, respectively.
  • the sending unit 540 may further send the second message to the UE before sending the pilot signal to the UE according to the n pilot signals configured by n beams in the selected group of beams.
  • the second signaling is used to indicate n pilot signal configurations, a start time and a transmission period of the transmitted pilot signal.
  • the base station 500 may further include: the second receiving unit 560 and the n beams in the first group of beams receive the second signal from the UE after transmitting the pilot signal to the UE according to the n kinds of pilot signal configurations.
  • Measurement information includes n measurement results obtained by the UE on the pilot signal according to the second signaling.
  • the second determining unit 570 can also determine the data transmission beam corresponding to the UE according to the selected set of beams and the second measurement information.
  • the transmitting unit 540 can also transmit data to the UE through the data transmission beam.
  • the second determining unit 570 may determine a spectral efficiency corresponding to each of the n measurement results, and determine an optimality among the n measurement results according to the spectral efficiency corresponding to the n measurement results respectively.
  • the second determining unit 570 can then determine the data transmission beam based on the optimal measurement and the selected set of beams.
  • each of the n measurement results may include a CQI.
  • each measurement may include a CQI, and at least one of the following: rank, PMI.
  • the pilot signal may be a CSI-RS.
  • FIG. 6 is a schematic block diagram of a UE in accordance with one embodiment of the present invention.
  • the UE 600 of FIG. 6 includes a receiving unit 610 and a measuring unit 620.
  • the receiving unit 610 receives the pilot signals sent by the base station through the n beams, where the n beams are selected by the base station according to the uplink received power of each of the formed m beams, and m is a positive integer greater than 1. , n is a positive integer, and n ⁇ m.
  • Measurement unit 620 measures the pilot signal.
  • the measurement complexity can be reduced.
  • the base station transmits the pilot signal through n beams of the m beams, which can improve the flexibility of configuring the pilot signal for the UE.
  • the receiving unit 610 may receive a pilot signal that is sent by the base station by using an optimal beam, where an uplink received power of the optimal beam is the largest among the m beams.
  • the receiving unit 610 may further receive the first signaling sent by the base station, where the first signaling is used to indicate the optimal beam corresponding to the pilot signal that is sent by the base station by using the optimal beam.
  • the pilot signal is configured, the start time of the transmitted pilot signal, and the transmission period, and the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the measuring unit 620 can measure the pilot signal according to the first signaling to obtain the first measurement information.
  • the UE 600 may further include a sending unit 630.
  • the transmitting unit 630 can transmit the first measurement information to the base station.
  • the receiving unit 610 can also receive data that the base station transmits through the optimal beam and according to the first measurement information.
  • the first measurement information may include a CQI.
  • the first measurement information may include a CQI, and at least one of the following: rank, PMI.
  • the receiving unit 610 may receive a pilot signal that is sent by the base station through n beams in a set of beams, where the group of beams is selected by the base station from the q groups of beams obtained by dividing m beams.
  • Each group of beams includes n beams, and the sum of uplink received powers of a group of beams in the q group beam is the largest.
  • the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the receiving unit 610 can receive a pilot signal that is sent by the base station according to n pilot configurations by n beams in a set of beams.
  • the receiving unit 610 may further receive the second signaling sent by the base station before the receiving base station separately transmits the pilot signals sent by the n pilot beams in the set of beams according to the n pilot configurations.
  • the second signaling is used to indicate n kinds of pilot signal configurations, a start time and a transmission period of transmitting a pilot signal;
  • the measuring unit 620 can measure the pilot signal according to the second signaling to obtain n measurement results.
  • the sending unit 630 may send second measurement information to the base station, where the second measurement information includes n measurement results.
  • the receiving unit 610 can also receive data sent by the base station through the data transmission beam, where the data transmission beam is determined by the base station according to the group of beams and the second measurement information.
  • each of the n measurement results may include a CQI.
  • each measurement may include a CQI, and at least one of the following: rank, PMI.
  • the pilot signal may be a CSI-RS.
  • FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • the base station 700 of FIG. 7 includes a processor 710 and a transmitter 720.
  • the processor 710 forms m beams by means of antenna weighting, and m is a positive integer greater than one.
  • the processor 710 also determines an uplink received power of each of the m beams based on the uplink sounding signal of the user equipment UE.
  • the processor 710 also selects n beams from the m beams based on the uplink received power of each of the m beams, n being a positive integer, and n ⁇ m.
  • Transmitter 720 transmits pilot signals to the UE through n beams.
  • the uplink received power of each of the m beams is determined according to the uplink sounding signal of the UE, and n beams are selected from the m beams according to the uplink received power of each of the m beams.
  • the UE transmits the pilot signal instead of transmitting the pilot signal to the UE through all the beams, thereby improving the flexibility of configuring the pilot signal for the UE and reducing the measurement complexity of the pilot signal by the UE.
  • the processor 710 may select an optimal beam from the m beams. Among them, the optimal received uplink power of the optimal beam is the largest among the m beams.
  • the transmitter 720 can transmit a pilot signal to the UE through an optimal beam.
  • the transmitter 720 may further send the first signaling to the UE before transmitting the pilot signal to the UE by using the optimal beam, where the first signaling is used to indicate the pilot corresponding to the optimal beam.
  • the signal configuration, the start time and the transmission period of the transmitted pilot signal, and the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the base station 700 may further include a receiver 730.
  • the receiver 730 receives the first measurement information from the UE after the transmitter 720 transmits the pilot signal to the UE through the optimal beam, where the first measurement information is obtained by the UE according to the first signaling.
  • the transmitter 720 can also transmit data to the UE according to the first measurement information through the optimal beam.
  • the first measurement information may include a CQI.
  • the first measurement information may include a CQI, and at least one of the following: rank, PMI.
  • the processor 710 may determine, according to the uplink received power of each of the m beams, a sum of uplink received power of each group of the q groups of beams, where the q groups of beams are m pairs. According to the beam splitting, each group of beams includes n beams, and then a group of beams can be selected from the q group beams, so that the sum of the uplink received powers of the selected one of the q group beams is the largest.
  • the n beams in the selected group of beams may be in one-to-one correspondence with the n types of pilot signals, and the pilot signal configuration is used for the time-frequency resources occupied by the pilot signals, respectively.
  • Transmitter 720 can transmit pilot signals to the UE via n pilot beams in a selected set of beams, respectively.
  • the transmitter 720 may further send the second message to the UE before sending the pilot signal to the UE according to the n pilot beams in the selected one of the set of beams.
  • the second signaling is used to indicate n pilot signal configurations, a start time and a transmission period of the transmitted pilot signal.
  • the receiver 730 may receive the first signal from the UE after the transmitter 720 transmits the pilot signal to the UE according to the n pilot signals configured by the n beams in the selected group of beams.
  • the second measurement information includes the n measurement results obtained by the UE on the pilot signal according to the second signaling.
  • the processor 710 is further configured to determine, according to the selected set of beams and the second measurement information, a data transmission beam corresponding to the UE.
  • Transmitter 720 can also transmit data to the UE through the data transmission beam.
  • the processor 710 may determine spectral efficiencies corresponding to the n measurement results respectively, and determine an optimal measurement result among the n measurement results according to the spectral efficiencies corresponding to the n measurement results respectively. Among them, the optimal measurement result corresponding to the n measurement results is the largest. Processor 710 can then determine the data transmission beam based on the optimal measurement and the selected set of beams.
  • each of the n measurement results may include a CQI.
  • each measurement may include a CQI, and at least one of the following: rank, PMI.
  • the pilot signal may be a CSI-RS.
  • FIG. 8 is a schematic block diagram of a UE according to another embodiment of the present invention.
  • the UE 800 of FIG. 8 includes a receiver 810 and a processor 820.
  • the receiver 810 receives the pilot signals sent by the base station through the n beams, and the n beams are selected by the base station according to the uplink received power of each of the formed m beams, and m is a positive integer greater than 1. , n is a positive integer, and n ⁇ m.
  • Processor 820 measures the pilot signals.
  • the measurement complexity can be reduced.
  • the base station transmits the pilot signal through n beams of the m beams, which can improve the flexibility of configuring the pilot signal for the UE.
  • the receiver 810 may receive a pilot signal that is sent by the base station by using an optimal beam, where an uplink received power of the optimal beam is the largest among the m beams.
  • the receiver 810 may further receive the first signaling sent by the base station before receiving the pilot signal sent by the base station by using the optimal beam, where the first signaling is used to indicate that the optimal beam corresponds to
  • the pilot signal is configured, the start time of the transmitted pilot signal, and the transmission period, and the pilot signal is configured to indicate the time-frequency resource occupied by the pilot signal.
  • the processor 820 can measure the pilot signal according to the first signaling to obtain the first measurement information.
  • the UE 800 may further include a transmitter 830.
  • Transmitter 830 can transmit the first measurement information to the base station.
  • the receiver 810 can also receive data transmitted by the base station through the optimal beam and transmitted according to the first measurement information.
  • the first measurement information may include a CQI.
  • the first measurement information may include a CQI, and at least one of the following: rank, PMI.
  • the receiver 810 can receive the base station to pass a group of beams respectively.
  • a pilot signal transmitted by n beams a group of beams selected by a base station from q beam beams obtained by m beam splitting, each group of beams including n beams, and uplink reception of a group of beams in q group beams The sum of power is the largest.
  • the n beams in the set of beams are in one-to-one correspondence with the n pilot signal configurations, and the pilot signals are configured to indicate time-frequency resources occupied by the pilot signals.
  • the receiver 810 can receive pilot signals transmitted by the base station according to n pilot configurations by n beams in a set of beams.
  • the receiver 810 may further receive the second signaling sent by the base station before the receiving base station separately transmits the pilot signals sent by the n beams in the set of beams according to the n pilot configurations.
  • the second signaling is used to indicate n kinds of pilot signal configurations, a start time and a transmission period of transmitting a pilot signal;
  • the receiver 810 can measure the pilot signal according to the second signaling to obtain n measurement results.
  • the receiver 810 may send second measurement information to the base station, where the second measurement information includes n measurement results.
  • the receiver 810 can also receive data transmitted by the base station through the data transmission beam, and the data transmission beam is determined by the base station according to the set of beams and the second measurement information.
  • each of the n measurement results may include a CQI.
  • each measurement may include a CQI, and at least one of the following: rank, PMI.
  • the pilot signal may be a CSI-RS.
  • the disclosed systems, devices, and The method can be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential to the prior art or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

本发明实施例提供通信方法、基站和用户设备。该方法包括:利用天线加权的方式,形成m个波束,m为大于1的正整数;根据用户设备UE的上行探测信号,确定m个波束中每个波束的上行接收功率;根据m个波束中每个波束的上行接收功率,从m个波束中选择n个波束,n为正整数,且n<m;通过n个波束,向UE发送导频信号。本发明实施例中,通过根据UE的上行探测信号确定m个波束中每个波束的上行接收功率,并根据m个波束中每个波束的上行接收功率从m个波束中选择n个波束来向 UE发送导频信号,而非通过所有波束向UE发送导频信号,从而能够提高为UE配置导频信号的灵活性,并且能够降低UE对导频信号的测量复杂度。

Description

通信方法、 基站和用户设备 技术领域
本发明涉及通信领域, 并且具体地, 涉及通信方法、 基站和用户设备。 背景技术
理论分析表明, 天线数目增多, 信道容量也会随之增大, 同时增加发送 端天线数目也能获得更好的波束赋形效果, 所以采用更多天线发送和接收的 无线传输技术,即多输入多输出(Multiple-Input and Multiple-Output, MIMO ) 技术, 一直是移动通信领域研究的主流技术之一。
参考信号,也就是导频信号,是由基站提供给用户设备( User Equipment, UE ) , 由 UE用于信道估计或信道测量的一种已知信号。 目前导频信号设计 的基本思想是每个端口对应一个导频信号, 对于这种一对一的映射方式来 说, 就是每个天线全向发射一个导频信号。
在 MIMO技术中, 随着天线数目的增多, 端口数目也会随之增多, 如 果按照现有的导频信号设计方案, 基站需要通过所有端口向 UE发送导频信 号, 从而造成基站在为 UE配置导频信号时灵活性较差, 而且 UE也需要针 对于所有端口测量导频信号, 增加了测量复杂度。 发明内容
本发明实施例提供通信方法、 基站和用户设备, 能够提高为 UE配置导 频信号的灵活性, 并且能够降低 UE对导频信号的测量复杂度。
第一方面, 提供了一种通信方法, 包括: 利用天线加权的方式, 形成 m 个波束, m为大于 1的正整数; 根据用户设备 UE的上行探测信号, 确定 m 个波束中每个波束的上行接收功率;根据所述 m个波束中每个波束的上行接 收功率, 从所述 m个波束中选择 n个波束, n为正整数, 且 n<m; 通过所述 n个波束, 向所述 UE发送导频信号。
结合第一方面,在第一种可能的实现方式中,所述根据所述 m个波束中 每个波束的上行接收功率, 从所述 m个波束中选择 n个波束, 包括: 从所述 m个波束中选择最优波束, 其中在所述 m个波束中所述最优波束的上行接 收功率最大; 所述通过所述 n个波束, 向所述 UE发送导频信号, 包括: 通 过所述最优波束, 向所述 UE发送导频信号。
结合第一方面的第一种可能的实现方式, 在第二种可能的实现方式中, 在所述通过所述最优波束向所述 UE发送导频信号之前, 所述方法还包括: 向所述 UE发送第一信令, 所述第一信令用于指示所述最优波束对应的导频 信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信号配置用 于指示所述导频信号所占用的时频资源。
结合第一方面的第二种可能的实现方式, 在第三种可能的实现方式中, 在所述通过所述最优波束向所述 UE发送所述导频信号之后, 还包括: 从所 述 UE接收第一测量信息, 所述第一测量信息是所述 UE根据所述第一信令 对所述导频信号测量得到; 通过所述最优波束, 根据所述第一测量信息向所 述 UE发送数据。
结合第一方面的第三种可能的实现方式, 在第四种可能的实现方式中, 所述第一测量信息包括信道质量指示 CQI; 或者, 所述第一测量信息包括所 述 CQI, 以及以下至少一种: 秩, 预编码矩阵指示 PMI。
结合第一方面,在第五种可能的实现方式中,所述根据所述 m个波束中 每个波束的上行接收功率, 从所述 m个波束中选择 n个波束, 包括: 根据所 述 m个波束中每个波束的上行接收功率,确定 q组波束中每组波束的上行接 收功率之和,其中所述 q组波束是对所述 m个波束划分得到的,每组波束包 括 n个波束; 从所述 q组波束中选择一组波束, 使得在所述 q组波束中所述 选择的一组波束的上行接收功率之和最大。
结合第一方面的第五种可能的实现方式, 在第六种可能的实现方式中, 所述选择的一组波束中 n个波束与 n种导频信号配置——对应,所述导频信 号配置分别用于所述导频信号所占用的时频资源;
所述通过所述 n个波束, 向所述 UE发送导频信号, 包括: 分别通过所 述选择的一组波束中的 n个波束, 根据所述 n种导频信号配置向所述 UE发 送导频信号。
结合第一方面的第六种可能的实现方式, 在第七种可能的实现方式中, 在所述分别通过所述选择的一组波束中的 n个波束,根据所述 n种导频信号 配置向所述 UE发送导频信号之前, 还包括: 向所述 UE发送第二信令, 所 述第二信令用于指示所述 n种导频信号配置、发送所述导频信号的起始时刻 和发送周期。 结合第一方面的第七种可能的实现方式, 在第八种可能的实现方式中, 在所述分别通过所述选择的一组波束中的 n个波束,根据所述 n种导频信号 配置向所述 UE发送导频信号之后,还包括: 从所述 UE接收第二测量信息, 所述第二测量信息包括所述 UE根据所述第二信令对所述导频信号测量得到 的 n个测量结果; ^据所述选择的一组波束和所述第二测量信息, 确定所述 UE对应的数据传输波束; 通过所述数据传输波束, 向所述 UE发送数据。
结合第一方面的第八种可能的实现方式, 在第九种可能的实现方式中, 所述根据所述选择的一组波束和所述第二测量信息, 确定所述 UE对应的数 据传输波束, 包括: 确定所述 n个测量结果分别对应的谱效率; 根据所述 n 个测量结果分别对应的谱效率,在所述 n个测量结果中确定最优的测量结果, 其中在所述 n个测量结果中所述最优的测量结果对应的谱效率最大; 根据所 述最优的测量结果和所述选择的一组波束, 确定所述数据传输波束。
结合第一方面的第八种可能的实现方式或第九种可能的实现方式,在第 十种可能的实现方式中, 所述 n个测量结果中的每个测量结果包括信道质量 指示 CQI; 或者, 所述每个测量结果包括所述 CQI, 以及以下至少一种: 秩, 预编码矩阵指示 PMI。
结合第一方面或第一方面的第一种可能的实现方式至第十种可能的实 现方式中任一方式, 在第十一种可能的实现方式中, 所述导频信号为信道状 态信息参考信号 CSI-RS。
第二方面, 提供了一种通信方法, 包括: 接收基站通过 n个波束发送的 导频信号,所述 n个波束是基站根据所形成的 m个波束中每个波束的上行接 收功率从所述 m个波束中选择的, m为大于 1 的正整数, n为正整数, 且 n<m; 对所述导频信号进行测量。
结合第二方面, 在第一种可能的实现方式中, 所述接收基站通过 n个波 束发送的导频信号, 包括: 接收所述基站通过最优波束发送的导频信号, 其 中在所述 m个波束中最优波束的上行接收功率最大。
结合第二方面的第一种可能的实现方式, 在第二种可能的实现方式中, 在所述接收基站通过最优波束发送的所述导频信号之前, 还包括: 接收所述 基站发送的第一信令,所述第一信令用于指示所述最优波束对应的导频信号 配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信号配置用于指 示所述导频信号所占用的时频资源; 所述对所述导频信号进行测量, 包括: 根据所述第一信令对所述导频信 号进行测量, 以得到第一测量信息。
结合第二方面的第二种可能的实现方式, 在第三种可能的实现方式中, 还包括: 向所述基站发送所述第一测量信息; 接收所述基站通过所述最优波 束并根据所述第一测量信息发送的数据。
结合第二方面的第二种可能的实现方式或第三种可能的实现方式,在第 四种可能的实现方式中, 所述第一测量信息包括信道质量指示 CQI; 或者, 所述第一测量信息包括所述 CQI, 以及以下至少一种: 秩, 预编码矩阵指示 PML
结合第二方面, 在第五种可能的实现方式中, 所述接收基站通过 n个波 束发送的导频信号, 包括: 接收所述基站分别通过一组波束中的 n个波束发 送的导频信号, 所述一组波束是所述基站从由所述 m 个波束划分得到的 q 组波束中选择的, 每组波束包括 n个波束, 在所述 q组波束中所述一组波束 的上行接收功率之和最大。
结合第二方面的第五种可能的实现方式, 在第六种可能的实现方式中, 所述一组波束中的 n个波束与 n种导频信号配置——对应, 所述导频信号配 置用于指示所述导频信号占用的时频资源;
所述接收所述基站通过一组波束中的 n个波束发送的导频信号, 包括: 接收所述基站分别通过所述一组波束中的 n个波束根据所述 n种导频配置发 送的导频信号。
结合第二方面的第六种可能的实现方式, 在第七种可能的实现方式中, 在所述接收所述基站分别通过所述一组波束中的 n个波束根据所述 n种导频 配置发送的导频信号之前, 包括: 接收所述基站发送的第二信令, 所述第二 信令用于指示所述 n种导频信号配置、发送所述导频信号的起始时刻和发送 周期;
所述对所述导频信号进行测量, 包括: 根据所述第二信令对所述导频信 号进行测量, 以得到 n个测量结果。
结合第二方面的第七种可能的实现方式, 在第八种可能的实现方式中, 还包括: 向所述基站发送第二测量信息, 所述第二测量信息包括所述 n个测 量结果; 接收所述基站通过数据传输波束发送的数据, 所述数据传输波束是 所述基站 ^据所述一组波束和所述第二测量信息确定的。 结合第二方面的第七种可能的实现方式或第八种可能的实现方式,在第 九种可能的实现方式中, 所述 n个测量结果中的每个测量结果包括信道质量 指示 CQI; 或者, 所述每个测量结果包括所述 CQI, 以及以下至少一种: 秩, 预编码矩阵指示 PMI。
结合第二方面或第二方面的第一种可能的实现方式至第九种可能的实 现方式中任一方式, 在第十种可能的实现方式中, 所述导频信号为信道状态 信息参考信号 CSI-RS。
第三方面, 提供了一种基站, 包括: 加权单元, 用于利用天线加权的方 式, 形成 m个波束, m为大于 1的正整数; 第一确定单元, 用于根据用户 设备 UE的上行探测信号, 确定 m个波束中每个波束的上行接收功率; 选择 单元, 用于根据所述 m个波束中每个波束的上行接收功率, 从所述 m个波 束中选择 n个波束, n为正整数, 且 n<m; 发送单元, 用于通过所述 n个波 束, 向所述 UE发送导频信号。
结合第三方面, 在第一种可能的实现方式中, 所述选择单元, 具体用于 从所述 m个波束中选择最优波束, 其中在所述 m个波束中所述最优波束的 上行接收功率最大; 所述发送单元, 具体用于通过所述最优波束, 向所述
UE发送导频信号。
结合第三方面的第一种可能的实现方式, 在第二种可能的实现方式中, 所述发送单元, 还用于在所述通过所述最优波束向所述 UE发送导频信号之 前, 向所述 UE发送第一信令, 所述第一信令用于指示所述最优波束对应的 导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信号配 置用于指示所述导频信号所占用的时频资源。
结合第三方面的第二种可能的实现方式, 在第三种可能的实现方式中, 还包括第一接收单元; 所述第一接收单元, 用于在所述发送单元通过所述最 优波束向所述 UE发送所述导频信号之后, 从所述 UE接收第一测量信息, 所述第一测量信息是所述 UE根据所述第一信令对所述导频信号测量得到; 所述发送单元, 还用于通过所述最优波束, 根据所述第一测量信息向所述
UE发送数据。
结合第三方面,在第四种可能的实现方式中,所述选择单元,具体用于: 根据所述 m个波束中每个波束的上行接收功率,确定 q组波束中每组波束的 上行接收功率之和,其中所述 q组波束是对所述 m个波束划分得到的,每组 波束包括 n个波束; 从所述 q组波束中选择一组波束, 使得在所述 q组波束 中所述选择的一组波束的上行接收功率之和最大。
结合第三方面的第四种可能的实现方式, 在第五种可能的实现方式中, 所述选择的一组波束中 n个波束与 n种导频信号配置——对应,所述导频信 号配置分别用于所述导频信号所占用的时频资源; 所述发送单元, 具体用于 分别通过所述选择的一组波束中的 n个波束, ^据所述 n种导频信号配置向 所述 UE发送导频信号。
结合第三方面的第五种可能的实现方式, 在第六种可能的实现方式中, 所述发送单元, 还用于在所述分别通过所述选择的一组波束中的 n个波束, 根据所述 n种导频信号配置向所述 UE发送导频信号之前, 向所述 UE发送 第二信令, 所述第二信令用于指示所述 n种导频信号配置、 发送所述导频信 号的起始时刻和发送周期。
结合第三方面的第六种可能的实现方式, 在第七种可能的实现方式中, 还包括第二接收单元和第二确定单元; 所述第二接收单元, 用于在所述发送 单元分别通过所述选择的一组波束中的 n个波束,根据所述 n种导频信号配 置向所述 UE发送导频信号之后, 从所述 UE接收第二测量信息, 所述第二 测量信息包括所述 UE根据所述第二信令对所述导频信号测量得到的 n个测 量结果; 所述第二确定单元, 还用于根据所述选择的一组波束和所述第二测 量信息, 确定所述 UE对应的数据传输波束; 所述发送单元, 还用于通过所 述数据传输波束, 向所述 UE发送数据。
结合第三方面的第七种可能的实现方式, 在第八种可能的实现方式中, 所述第二确定单元, 具体用于: 确定所述 n个测量结果分别对应的谱效率; 根据所述 n个测量结果分别对应的谱效率,在所述 n个测量结果中确定最优 的测量结果, 其中在所述 n个测量结果中所述最优的测量结果对应的谱效率 最大; 根据所述最优的测量结果和所述选择的一组波束, 确定所述数据传输 波束。
第四方面, 提供了一种用户设备, 包括: 接收单元, 用于接收基站通过 n个波束发送的导频信号,所述 n个波束是基站根据所形成的 m个波束中每 个波束的上行接收功率从所述 m个波束中选择的, m为大于 1的正整数, n 为正整数, 且 n<m; 测量单元, 用于对所述导频信号进行测量。
结合第四方面, 在第一种可能的实现方式中, 所述接收单元, 具体用于 接收所述基站通过最优波束发送的导频信号,其中在所述 m个波束中最优波 束的上行接收功率最大。
结合第四方面的第一种可能的实现方式, 在第二种可能的实现方式中, 所述接收单元,还用于在所述接收基站通过最优波束发送的所述导频信号之 前, 接收所述基站发送的第一信令, 所述第一信令用于指示所述最优波束对 应的导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信 号配置用于指示所述导频信号所占用的时频资源; 所述测量单元, 具体用于 根据所述第一信令对所述导频信号进行测量, 以得到第一测量信息。
结合第四方面的第二种可能的实现方式, 在第三种可能的实现方式中, 还包括发送单元; 所述发送单元, 用于向所述基站发送所述第一测量信息; 所述接收单元,还用于接收所述基站通过所述最优波束并根据所述第一测量 信息发送的数据。
结合第四方面, 在第四种可能的实现方式中, 所述接收单元, 具体用于 接收所述基站分别通过一组波束中的 n个波束发送的导频信号,所述一组波 束是所述基站从由所述 m个波束划分得到的 q组波束中选择的,每组波束包 括 n个波束, 在所述 q组波束中所述一组波束的上行接收功率之和最大。
结合第四方面的第四种可能的实现方式, 在第五种可能的实现方式中, 所述一组波束中的 n个波束与 n种导频信号配置——对应, 所述导频信号配 置用于指示所述导频信号占用的时频资源; 所述接收单元, 具体用于接收所 述基站分别通过所述一组波束中的 n个波束根据所述 n种导频配置发送的导 频信号。
结合第四方面的第五种可能的实现方式, 在第六种可能的实现方式中, 所述接收单元,还用于在所述接收所述基站分别通过所述一组波束中的 n个 波束根据所述 n种导频配置发送的导频信号之前,接收所述基站发送的第二 信令, 所述第二信令用于指示所述 n种导频信号配置、 发送所述导频信号的 起始时刻和发送周期; 所述测量单元, 具体用于根据所述第二信令对所述导 频信号进行测量, 以得到 n个测量结果。
结合第四方面的第六种可能的实现方式, 在第七种可能的实现方式中, 还包括发送单元; 所述发送单元, 用于向所述基站发送第二测量信息, 所述 第二测量信息包括所述 n个测量结果; 所述接收单元, 还用于接收所述基站 通过数据传输波束发送的数据, 所述数据传输波束是所述基站根据所述一组 波束和所述第二测量信息确定的。
本发明实施例中,通过根据 UE的上行探测信号确定 m个波束中每个波 束的上行接收功率, 并根据 m个波束中每个波束的上行接收功率从 m个波 束中选择 n个波束来向 UE发送导频信号, 而非通过所有波束向 UE发送导 频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对 导频信号的测量复杂度。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作筒单地介绍, 显而易见地, 下面所描述的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的 前提下, 还可以根据这些附图获得其他的附图。
图 1是根据本发明一个实施例的通信方法的示意性流程图。
图 2是根据本发明另一实施例的通信方法的示意性流程图。
图 3是可应用本发明实施例的场景的一个例子的示意图。
图 4是可应用本发明实施例的场景的另一例子的示意图。
图 5是根据本发明一个实施例的基站的示意框图。
图 6是根据本发明一个实施例的 UE的示意框图。
图 7是根据本发明另一实施例的基站的示意框图。
图 8是根据本发明另一实施例的 UE的示意框图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创 造性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
本发明的技术方案, 可以应用于各种通信系统, 例如: 全球移动通信系 统 ( Global System of Mobile communication, GSM ),码分多址 ( Code Division Multiple Access , CDMA ) 系统, 宽带码分多址 ( Wideband Code Division Multiple Access Wireless , WCDMA ), 通用分组无线业务 ( General Packet Radio Service, GPRS ), 长期演进( Long Term Evolution, LTE )等。 用户设备 ( User Equipment, UE ),也可称为移动终端( Mobile Terminal, MT )、 移动用户设备等, 可以经无线接入网 (例如, Radio Access Network, RAN )与一个或多个核心网进行通信。 用户设备可以是移动的终端, 如移动 电话(或称为"蜂窝"电话)和具有移动终端的计算机, 例如, 可以是便携式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置。
基站,可以是 GSM或 CDMA中的基站( Base Transceiver Station, BTS ), 也可以是 WCDMA 中的基站 (NodeB ), 还可以是 LTE 中的演进型基站 ( evolved Node B , eNB或 e-NodeB ), 本发明并不限定。
图 1是根据本发明一个实施例的通信方法的示意性流程图。 图 1的方法 由基站执行。
110, 利用天线加权的方式, 形成 m个波束, m为大于 1的正整数。 例如, 在有源天线系统(Active Antenna System, AAS ) 中, 基站可以 通过天线加权的方式形成 m个不同指向的波束。
每个波束可以对应一个或多个端口。 比如, 在天线为单极化天线的情况 下, 每个波束可以对应 1个端口, 那么 m个波束可以对应于 m个端口。 在 天线为交叉极化天线的情况下,每个波束可以对应 2个端口,那么 m个波束 可以对应于 mx2个端口。
120, 根据 UE的上行探测信号, 确定 m个波束中每个波束的上行接收 功率。
例如, 基站可以通过每个波束对应的端口接收 UE 的上行探测
( Sounding )信号, 根据每个波束对应的端口接收的上行探测信号来确定该 波束的上行接收功率。
130, 根据 m个波束中每个波束的上行接收功率, 从 m个波束中选择 n 个波束, n为正整数, 且 n<m。
例如,基站可以通过比较每个波束的上行接收功率的大小,从 m个波束 中选择 n个波束。
140, 通过 n个波束, 向 UE发送导频信号。
具体地,基站可以通过 n个波束分别对应的端口,向 UE发送导频信号。 如果采用现有的导频信号设计方案, 即每个端口映射一个导频信号, 那 么基站需要通过 m个波束对应的所有端口来向 UE发送导频信号,造成基站 为 UE配置导频信号时灵活性较差。 相应地, 对于 UE而言, 需要测量通过 m个波束的所有端口发送的导频信号, 测量复杂度也较大。 而本发明实施例 中, 基站通过根据 UE的上行探测信号确定 m个波束各自的上行接收功率, 根据 m个波束的上行接收功率选择 m个波束中的 n个波束分别对应的端口 来向 UE发送导频信号, 从而能够充分提高基站为 UE配置导频信号的灵活 性。 而且由于 n小于 m, 因此对于 UE而言, 无需测量所有波束发送的导频 信号, 从而能够降低测量复杂度。
本发明实施例中,通过根据 UE的上行探测信号确定 m个波束中每个波 束的上行接收功率, 并根据 m个波束中每个波束的上行接收功率从 m个波 束中选择 n个波束来向 UE发送导频信号, 而非通过所有波束向 UE发送导 频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对 导频信号的测量复杂度。
此外,对于大规模天线系统,例如, m个波束对应的端口数目大于 8时, 那么现有的导频信号设计方案无法支持这么多端口, 因此, 本发明实施例, 通过根据 m个波束中每个波束的上行接收功率从 m个波束中选择 n个波束, 并通过 n个波束向 UE发送导频信号, 而非通过所有波束向 UE发送导频信 号, 从而能够实现大规模天线系统中导频信号的传输。
上述导频信号可以为仅用于信道测量的导频信号。 对于这样的导频信 号, 基站无需全向发送, 因此可以通过其中的一个或多个波束来发送。 可选 地,作为一个实施例,导频信号可以为信道状态信息参考信号(Channel State Information-Reference Signal , CSI-RS )。
可选地, 作为另一实施例, 在步骤 120中, 基站可以经过一段时间的统 计得到每个波束的上行接收功率。 例如, 基站可以设置一个时域计数器, 在 时域滤波的窗长内统计每个波束的上行接收功率。 具体地, 每个波束的上行 接收功率可以用每个波束的平均上行接收功率来代替。
具体地, 基站可以按照下述步骤确定每个波束的平均上行接收功率:
A )基站可以通过 m个波束对应的所有端口接收 UE的上行探测信号。 基站可以在每个端口基于上行探测信号进行信道估计,确定每个端口在子载 波上对应的信道系数。 例如, 对于 m个波束中的第 i个波束所对应的第 j个 端口, 在子载波 k上所估计得到的信道系数可以为 j k
B )基站可以计算每个波束的信道系数在所有端口、 所有子载波上的平 均功率。 Nsubcafr N ort 例如, 第 i个波束的平均上行接收功率 h =— -— f f hn k , 其中, ^^ 可以表示!!!个波束对应的所有端口数目; Nsub 可以表示所 有子载波。
C )基站可以在时域上将每个波束的平均上行接收功率进行滤波。 相应 地, 时域计数器加 1。
D )基站可以判断时域计数器是否达到时域滤波的窗长。 如果时域计数 器未达到时域滤波的窗长, 则基站返回执行上述步骤 A )。
如果时域计数器达到时域滤波的窗长,则可以将该段时间内 m个波束各 自的平均上行接收功率作为 m个波束的上行接收功率, 然后用于步骤 130 的处理。
基站可以基于 m个波束的上行接收功率, 从 m个波束中选择一个或多 个波束, 来向 UE发送导频信号。 下面将详细描述基站从 m个波束中选择一 个波束向 UE发送导频信号的过程。
可选地, 作为另一实施例, 在步骤 130中,基站从 m个波束中选择最优 波束, 其中 m个波束中最优波束的上行接收功率最大。 相应地, 在步骤 140 中, 基站可以通过最优波束, 向 UE发送导频信号。
具体地,基站可以从 m个波束中选择一个上行接收功率最大的波束作为 最优波束。 例如,基站可以比较 m个波束各自的平均上行接收功率, 从而选 择平均上行接收功率最大的最优波束。 然后通过最优波束向 UE发送导频信 号, 可见, 本实施例中, 基站通过 m个波束中的一个波束向 UE发送导频信 号, 而非通过所有波束来发送导频信号, 从而能够减少导频信号的开销。
可选地, 作为另一实施例, 在通过最优波束向 UE发送导频信号之前, 基站可以向 UE发送第一信令, 第一信令用于指示最优波束对应的导频信号 配置、 发送导频信号的起始时刻和发送周期, 导频信号配置用于指示导频信 号所占用的时频资源。
为了使得基站所服务的各个 UE能够对各个波束进行区分, 基站可以在 各个波束上分别采用不同的导频信号配置来发送导频信号。导频信号配置指 示导频信号占用的时频资源。 因此, 基站通过各个波束发送的导频信号占用 不同的时频资源。
但是,每个子帧所支持的导频信号配置的数目是有限的, 当 m大于每个 子帧所支持的导频信号配置的数目时, 为了保证各个波束所对应的导频信号 配置互不相同, 就需要通过不同的子帧来区分。 例如, 在目前标准中, 对于 每个波束对应 2端口的情况, 每个子帧最多支持 20种 CSI-RS配置, 当 m 大于 20时, 比如 m为 24, 基站可以分别在 2个子帧上通过 24个波束发送 CSI-RS。 比如, 殳导频信号的发送周期为 10ms, 通常 1个子帧为 1ms, 也就是导频信号的发送周期为 10个子帧。如上所述,每个周期中可以通过 2 个子帧来发送导频信号,那么发送导频信号的子帧可以分别是子帧 1、 2、 11、 12、 21和 22等, 以此类推。 具体来说, 在第一个周期中, 基站可以在子帧 1上通过 20个波束发送 CSI-RS,在子帧 2上通过其余 4个波束发送 CSI-RS。 在下一个周期中, 基站可以在子帧 11上通过 20个波束发送 CSI-RS, 在子 帧 12上通过 4个波束发送 CSI-RS。 以此类推。
在基站向 UE发送导频信号之前, 基站需要通知 UE导频信号所占用的 时频资源、 发送导频信号的起始时刻和发送周期。 具体来说, 基站可以通过 第一信令向 UE指示该最优波束对应的导频信号配置、 发送导频信号的起始 时刻和发送周期。 第一信令可以是高层信令。 这样, UE 可以在该导频信号 配置指示的时频资源上,从上述起始时刻开始按照发送周期对导频信号进行 测量。
可选地, 作为另一实施例, 在通过最优波束向 UE发送导频信号之后, 基站还可以从 UE接收第一测量信息, 第一测量信息是 UE根据第一信令对 导频信号测量得到。 然后基站可以通过最优波束, 根据第一测量信息向 UE 发送数据。
基站可以将最优波束作为 UE对应的数据传输波束, 通过该最优波束, 基于第一测量信息向 UE发送数据。
可选地, 作为另一实施例, 第一测量信息可以包括信道质量指示 ( Channel Quality Indication, CQI )。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI, 以及以下至少 一种: 秩(rank ), 预编码矩阵指示 ( Precoding Matrix Indicator, PMI )。 例 如, UE可以根据传输模式, 确定是否使得测量信息中包含秩或 PMI。
在上述描述中,基站从 m个波束中选择了一个波束来向 UE发送导频信 号。 此外, 基站还可以从 m个波束中选择多个波束来向 UE发送导频信号, 下面将详细描述该过程。 可选地, 作为另一实施例, 在步骤 130中,基站可以根据 m个波束中每 个波束的上行接收功率, 确定 q组波束中每组波束的上行接收功率之和, 其 中 q组波束是对 m个波束划分得到的,每组波束包括 n个波束。基站可以从 q组波束中选择一组波束, 使得在 q组波束中选择的一组波束的上行接收功 率之和最大。
具体地,基站可以对 m个波束进行分组, 将它们分为 q组波束, 其中每 组波束包括 n个波束。 基站可以根据波束的指向来进行分组, 使得各组之间 的空间间隔足够远。 各组之间的空间间隔可以根据实际需求来确定, 例如可 以根据传输性能和导频信号的开销来确定。
基站可以计算 q组波束中每组波束的上行接收功率之和, 例如, 基站可 以将每组波束中的 n个波束的平均上行接收功率求和,得到每组波束的上行 接收功率之和。 基站可以比较各组波束的上行接收功率之和, 从中选择上行 接收功率之和最大的一组波束。 可见, 基站从各组波束中选择一组波束来向 UE发送导频信号, 而非通过所有波束来发送导频信号, 从而能够节省导频 信号的开销。
可选地, 作为另一实施例, 所选择的一组波束中 n个波束与 n种导频信 号配置一一对应, n种导频信号配置分别用于指示导频信号所占用的时频资 源。 在步骤 140中, 基站可以分别通过选择的一组波束中的 n个波束, 根据 n种导频信号配置向 UE发送导频信号。
具体地, 基站可以通过这组波束中的 n个波束, 分别在 n种导频信号配 置所指示的时频资源上向 UE发送 n种导频信号。
可选地, 作为另一实施例, 基站可以在分别通过选择的一组波束中的 n 个波束, 根据 n种导频信号配置向 UE发送导频信号之前, 向 UE发送第二 信令, 第二信令可以用于指示 n种导频信号配置、 发送导频信号的起始时刻 和发送周期。
为了使得基站所服务的各个 UE能够对各个波束进行区分, 基站可以在 各个波束上分别采用不同的导频信号配置来发送导频信号。导频信号配置指 示导频信号占用的时频资源。 因此, 基站通过各个波束发送的导频信号占用 不同的时频资源。
但是,每个子帧所支持的导频信号配置的数目是有限的, 当 m大于每个 子帧所支持的导频信号配置的数目时, 为了保证各个波束所对应的导频信号 配置互不相同, 就需要通过不同的子帧来区分。 例如, 在目前标准中, 对于 每个波束对应 2端口的情况, 每个子帧最多支持 20种 CSI-RS配置, 当 m 大于 20时, 比如 m为 24, 支设将 24个波束分为 4组, 基站可以分别在 2 个子帧上通过 4组波束来发送 CSI-RS。 比如, 4 设发送导频信号的周期为 10ms, 也就是 10个子帧。 每个周期中可以通过 2个子帧来发送导频信号。 那么发送导频信号的子帧可以分别是子帧 1、 2、 11、 12、 21和 22等, 以此 类推。 具体来说, 在第一个周期中, 基站可以在子帧 1上通过第 1组和第 2 组波束来发送 CSI-RS,在子帧 2上通过第 3组和第 4组波束来发送 CSI-RS。 在下一个周期中, 基站可以在子帧 11 上通过第 1 组和第 2组波束来发送 CSI-RS, 在子帧 12上通过第 3组和第 4组波束来发送 CSI-RS。 以此类推。
基站在发送导频信号之前, 需要通知 UE各种导频信号所占用的时频资 源、 发送导频信号的起始时刻以及发送周期。 具体来说, 基站可以通过第二 信令向 UE指示 n种导频信号配置、 起始时刻以及发送周期。 这样, UE可 以在 n种导频信号配置分别指示的时频资源上,从起始时刻开始按照发送周 期对导频信号进行测量。 第二信令可以是高层信令。
可选地,作为另一实施例,基站在通过所选择的一组波束中的 n个波束, 根据 n种导频信号配置向 UE发送导频信号之后, 可以从 UE接收第二测量 信息, 第二测量信息包括 UE在 n种导频信号配置指示的时频资源上对导频 信号测量得到的 n个测量结果。基站可以根据所选择的一组波束和第二测量 信息, 确定 UE对应的数据传输波束。 然后基站可以通过数据传输波束, 向 UE发送数据。
n种导频信号配置分别指示的时频资源是相互错开的, 因此 UE可以在 n种导频信号配置分别指示的时频资源上进行测量, 相应地得到 n个测量结 果。
可选地, 作为另一实施例, 基站可以确定由该 UE上 >¾的 n个测量结果 分别对应的谱效率。 基站可以根据 n个测量结果分别对应的谱效率, 在 n个 测量结果中确定最优的测量结果, 其中在 n个测量结果中最优的测量结果对 应的谱效率最大。 然后基站可以根据最优的测量结果和所选择的一组波束, 确定数据传输波束。
可选地, 作为另一实施例, n 个测量结果中的每个测量结果可以包括
CQI。 或者, 每个测量结果可以包括 CQI, 以及以下至少一种: 秩, PMI。 具体地, 基站可以根据由该 UE上报的 n个测量结果中的 CQI和秩, 计 算它们各自对应的谱效率。 如果测量结果中不包括秩, 那么基站可以将秩默 认为 rankl , 从而得到各个测量结果对应的谱效率。 基站可以从 n个测量结 果中选择对应的谱效率最大的一个最优的测量结果。 由于每个测量结果对应 于一种导频信号配置, 而导频信号配置与波束也是——对应的, 因此每个测 量结果对应于一个波束。 当确定了最优的测量结果, 就可以在上述选择的一 组波束中确定最优的测量结果所对应的波束作为数据传输波束来向 UE发送 数据。
图 2是根据本发明另一实施例的通信方法的示意性流程图。 图 2的方法 由 UE执行。
210,接收基站通过 n个波束发送的导频信号, n个波束是基站根据所形 成的 m个波束中每个波束的上行接收功率从 m个波束中选择的, m为大于 1的正整数, n为正整数, 且 n<m。
220, 对导频信号进行测量。
本发明实施例中, 通过测量基站通过 n个波束发送的导频信号, 而 n个 波束是从 m个波束选择的, 从而能够降低测量复杂度。 而且, 基站通过 m 个波束中的 n个波束发送导频信号,能够提高为 UE配置导频信号的灵活性。
可选地, 作为一个实施例, 上述导频信号可以为 CSI-RS。
可选地, 作为另一实施例, 在步骤 210中, UE可以接收基站通过最优 波束发送的导频信号, 其中在 m个波束中最优波束的上行接收功率最大。
可选地, 作为另一实施例, UE可以在接收基站通过最优波束发送的导 频信号之前, 接收基站发送的第一信令, 第一信令用于指示最优波束对应的 导频信号配置、 发送导频信号的起始时刻和发送周期, 导频信号配置用于指 示导频信号所占用的时频资源。 在步骤 220中, UE可以根据第一信令对导 频信号进行测量, 以得到第一测量信息。
具体地, UE可以在最优波束对应的导频信号配置所指示的时频资源上, 从上述起始时刻开始按照发送周期对导频信号进行测量,从而得到相应的测 量信息。
可选地, 作为另一实施例, 在步骤 220之后, UE可以向基站发送第一 测量信息, 并可以接收基站通过最优波束并根据第一测量信息发送的数据。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI。 或者, 第一测 量信息可以包括 CQI, 以及以下至少一种: 秩, PMI。
上面描述了 UE接收基站通过一个波束发送的导频信号的过程, 并描述 了相应的测量以及接收数据的过程。 下面将描述 UE接收基站通过多个波束 发送的导频信号的过程, 并描述相应的测量以及接收数据的过程。
可选地, 作为另一实施例, 在步骤 210中, UE可以接收基站分别通过 一组波束中的 n个波束发送的导频信号,上述一组波束是基站从由 m个波束 划分得到的 q组波束中选择的, 每组波束包括 n个波束, 在 q组波束中一组 波束的上行接收功率之和最大。
可选地, 作为另一实施例, 上述一组波束中的 n个波束与 n种导频信号 配置——对应, 导频信号配置用于指示导频信号占用的时频资源。 UE 可以 接收基站分别通过一组波束中的 n个波束根据 n种导频配置发送的导频信 号。
具体地, 基站可以分别通过 n个波束, 在 n种导频信号配置所指示的时 频资源上向 UE发送 n种导频信号。
可选地, 作为另一实施例, UE可以在接收基站分别通过一组波束中的 n个波束根据 n种导频信号配置发送的导频信号之前, 接收基站发送的第二 信令, 第二信令用于指示 n种导频信号配置、 发送所述导频信号的起始时刻 和发送周期。
在步骤 220中, UE可以根据第二信令对导频信号进行测量, 以得到 n 个测量结果。
具体地, UE可以在 n种导频信号配置所分别指示的时频资源上, 从上 述起始时刻开始按照发送周期对导频信号进行测量。
可选地, 作为另一实施例, UE 可以向基站发送第二测量信息, 第二测 量信息包括 n个测量结果, 并可以接收基站通过数据传输波束发送的数据, 数据传输波束是基站根据一组波束和第二测量信息确定的。
下面将结合具体例子详细本发明实施例。 应注意, 下面的例子只是为了 帮助本领域技术人员更好地理解本发明实施例, 而非限制本发明实施例的范 围。
图 3是可应用本发明实施例的场景的一个例子的示意图。
在图 3中, 假设有 32根交叉极化天线, 每个极化方向上有 16根天线。 基站可以利用天线加权的方式, 形成 16个波束, 如图 3所示, 这 16个波束 可以表示为波束 0至波束 15。 其中, 每个波束可以对应于 2个端口, 那么 16个波束对应于 32个端口。
基站可以通过 32个端口分别接收 UE的上行探测信号,根据 UE的上行 探测信号确定波束 0至波束 15各自的平均上行接收功率。 具体过程可以参 照图 1的实施例的过程。
然后基站可以比较波束 0至波束 15的平均上行接收功率, 从而选择平 均上行接收功率最大的一个波束作为发送导频信号的波束,
例如, 假设是波束 2的平均上行接收功率最大, 下面将以波束 2为例进 行说明。
基站在发送导频信号之前可以向 UE发送高层信令, 向 UE指示波束 2 对应的导频信号配置、 发送导频信号的起始时刻以及发送周期。 这样, UE 可以在波束 2对应的导频信号配置指示的时频资源上,根据起始时刻和发送 周期对导频信号进行测量, 得到测量信息, 并将测量信息上 给基站。
基站可以将波束 2作为 UE对应的数据传输波束, 通过波束 2, 并根据 测量信息向 UE发送数据。
按照现有的导频设计方案, 基站需要通过 32个端口来向 UE发送导频 信号, 不仅造成基站为 UE配置导频信号的灵活性差, 而且造成 UE测量导 频信号的复杂度高。 而本发明实施例中, 基站可以从 16个波束中选择一个 波束来发送导频信号, 也就是从 32个端口中选择 2个端口发送导频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对导频信号 的测量复杂度。
此外, 现有的导频设计方案并不支持 32端口, 而本发明实施例中, 基 站可以从 16个波束中选择一个波束来发送导频信号,也就是从 32个端口中 选择 2个端口发送导频信号, 这样仍可以沿用协议支持的导频图样和码本, 能够实现大规模天线系统中导频信号的传输。
图 4是可应用本发明实施例的场景的另一例子的示意图。
在图 4中,仍假设有 32根交叉极化天线,每个极化方向上有 16根天线。 基站可以利用天线加权的方式, 形成 16个波束, 如图 4所示, 这 16个波束 可以表示为波束 0至波束 15。 其中, 每个波束可以对应于 2个端口, 那么 16个波束对应于 32个端口。
基站可以将 16个波束分为 4组, 每 4个相邻的波束为一组。 如图 4所 示, 这 4个组可以分别表示为组 0、 组 1、 组 2和组 3。
基站可以通过 32个端口分别接收 UE的上行探测信号,根据 UE的上行 探测信号确定波束 0至波束 15各自的平均上行接收功率。 具体过程可以参 照图 1的实施例的过程。
然后, 基站可以分别计算各组的波束的平均上行接收功率之和。 例如, 将波束 0至波束 3的平均上行接收功率相加得到组 0的平均上行接收功率之 和。
基站可以比较组 0至组 3各自的平均上行接收功率之和,选择平均上行 接收功率之后最大的一组,然后通过这组中的各个波束向 UE发送导频信号。
假设组 2的平均上行接收功率之和最大。 下面将以组 2为例进行说明。 为了区分各个波束, 每个波束对应的导频信号配置是不同的。 也就是, 组内的各个波束对应的导频信号配置是不同的,组与组之间对应的导频信号 配置也是不同的, 即 16个波束对应的 16种导频信号配置。 因此, 波束 4至 波束 7分别对应于 4种导频信号配置。 也就是, 基站可以通过波束 4至波束 7, 采用 4种导频信号配置向 UE发送 4种导频信号。 还可以理解为, 基站 通过组 2中的 8个端口向 UE发送 4种导频信号, 每个波束对应的 2个端口 与一种导频信号配置相对应。
基站在发送导频信号之前, 可以向 UE发送高层信令, 向 UE指示波束 4至波束 7分别对应的 4种导频信号配置、 发送导频信号的起始时刻以及发 送周期。
UE可以在 4种导频信号配置分别指示的时频资源上, ^据起始时刻和 发送周期测量导频信号。 ^没将 4种导频信号配置分别指示的时频资源称为 4个测量点, 即测量点 0、 测量点 1、 测量点 2和测量点 3。 测量点 0对应于 波束 4, 测量点 1对应于波束 5 , 测量点 2对应于波束 6, 测量点 4对应于波 束 7。 此处, 各个测量点对应的起始时刻和发送周期也是相同的。
UE分别在 4个测量点上对波束 4至 7发送的 4种导频信号进行测量, 得到 4个测量结果, 并上报给基站。
基站可以根据 4个测量结果, 得到 4个测量结果对应的谱效率。 对 4个 测量结果对应的谱效率进行比较, 选择对应的谱效率最大的一个测量结果。 并可以确定所选择的这个测量结果对应的波束。 例如, 4 设在测量点 1得到 的测量结果对应的谱效率最大,那么该测量结果对应的波束为波束 5。那么, 基站可以利用波束 5 , 向 UE发送数据。
按照现有的导频设计方案, 基站需要通过 32个端口来向 UE发送导频 信号, 不仅造成基站为 UE配置导频信号的灵活性差, 而且造成 UE测量导 频信号的复杂度高。 而本发明实施例中, 基站可以从 16个波束中选择部分 波束来发送导频信号, 也就是从 32个端口中选择部分端口发送导频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对导频信号 的测量复杂度。
此外, 现有的导频设计方案并不支持 32端口, 而本发明实施例中, 基 站可以从 16个波束中选择一个波束来发送导频信号,也就是从 32个端口中 选择 2个端口发送导频信号, 这样仍可以沿用协议支持的导频图样和码本, 能够实现大规模天线系统中导频信号的传输。
图 5是根据本发明一个实施例的基站的示意框图。 图 5的基站 500包括 加权单元 510、 第一确定单元 520、 选择单元 530和发送单元 540。
加权单元 510利用天线加权的方式, 形成 m个波束, m为大于 1的正 整数。 第一确定单元 520根据用户设备 UE的上行探测信号, 确定 m个波束 中每个波束的上行接收功率。选择单元 530根据 m个波束中每个波束的上行 接收功率, 从 m个波束中选择 n个波束, n为正整数, 且 n<m。 发送单元 540通过 n个波束, 向 UE发送导频信号。
本发明实施例中,通过根据 UE的上行探测信号确定 m个波束中每个波 束的上行接收功率, 并根据 m个波束中每个波束的上行接收功率从 m个波 束中选择 n个波束来向 UE发送导频信号, 而非通过所有波束向 UE发送导 频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对 导频信号的测量复杂度。
可选地,作为一个实施例,选择单元 530可以从 m个波束中选择最优波 束,其中在 m个波束中最优波束的上行接收功率最大。发送单元 540可以通 过最优波束, 向 UE发送导频信号。
可选地, 作为另一实施例, 发送单元 540还可以在通过最优波束向 UE 发送导频信号之前, 向 UE发送第一信令, 第一信令用于指示最优波束对应 的导频信号配置、 发送导频信号的起始时刻和发送周期, 导频信号配置用于 指示导频信号所占用的时频资源。
可选地, 作为另一实施例, 基站 500还可以包括第一接收单元 550。 第 一接收单元 550在发送单元 540通过最优波束向 UE发送导频信号之后, 从 UE接收第一测量信息, 第一测量信息是 UE根据第一信令对导频信号测量 得到。 发送单元 540还可以通过最优波束, 根据第一测量信息向 UE发送数 据。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI。 或者, 第一测 量信息可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地,作为另一实施例,选择单元 530可以根据 m个波束中每个波束 的上行接收功率, 确定 q组波束中每组波束的上行接收功率之和, 其中 q组 波束是对 m个波束划分得到的,每组波束包括 n个波束, 然后可以从 q组波 束中选择一组波束,使得在 q组波束中选择的一组波束的上行接收功率之和 最大。
可选地, 作为另一实施例, 选择的一组波束中 n个波束可以与 n种导频 信号配置一一对应, 导频信号配置分别用于导频信号所占用的时频资源。 发 送单元 540可以分别通过选择的一组波束中的 n个波束,根据 n种导频信号 配置向 UE发送导频信号。
可选地, 作为另一实施例, 发送单元 540还可以在分别通过选择的一组 波束中的 n个波束, 根据 n种导频信号配置向 UE发送导频信号之前, 向 UE发送第二信令, 第二信令用于指示 n种导频信号配置、 发送导频信号的 起始时刻和发送周期。
可选地, 作为另一实施例, 基站 500还可以包括第二接收单元 560和第 一组波束中的 n个波束根据 n种导频信号配置向 UE发送导频信号之后, 从 UE接收第二测量信息, 第二测量信息包括 UE根据第二信令对导频信号测 量得到的 n个测量结果。 第二确定单元 570还可以根据选择的一组波束和第 二测量信息, 确定 UE对应的数据传输波束。 发送单元 540还可以通过数据 传输波束, 向 UE发送数据。
可选地, 作为另一实施例, 第二确定单元 570可以确定 n个测量结果分 别对应的谱效率, 并可以根据 n个测量结果分别对应的谱效率, 在 n个测量 结果中确定最优的测量结果, 其中在 n个测量结果中最优的测量结果对应的 谱效率最大。 然后第二确定单元 570可以根据最优的测量结果和选择的一组 波束, 确定数据传输波束。 可选地, 作为另一实施例, n 个测量结果中的每个测量结果可以包括 CQI。 或者, 每个测量结果可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为一个实施例, 上述导频信号可以为 CSI-RS。
图 5的基站 500的其它功能和操作可以参照上面图 1至图 4的方法实施 例中涉及基站的过程, 为了避免重复, 此处不再赘述。
图 6是根据本发明一个实施例的 UE的示意框图。 图 6的 UE 600包括 接收单元 610和测量单元 620。
接收单元 610接收基站通过 n个波束发送的导频信号, n个波束是基站 根据所形成的 m个波束中每个波束的上行接收功率从 m个波束中选择的, m为大于 1的正整数, n为正整数, 且 n<m。 测量单元 620对导频信号进行 测量。
本发明实施例中, 通过测量基站通过 n个波束发送的导频信号, 而 n个 波束是从 m个波束选择的, 从而能够降低测量复杂度。 而且, 基站通过 m 个波束中的 n个波束发送导频信号,能够提高为 UE配置导频信号的灵活性。
可选地, 作为一个实施例, 接收单元 610可以接收基站通过最优波束发 送的导频信号, 其中在 m个波束中最优波束的上行接收功率最大。
可选地, 作为另一实施例, 接收单元 610还可以在接收基站通过最优波 束发送的导频信号之前, 接收基站发送的第一信令, 第一信令用于指示最优 波束对应的导频信号配置、 发送导频信号的起始时刻和发送周期, 导频信号 配置用于指示导频信号所占用的时频资源。 测量单元 620可以根据第一信令 对导频信号进行测量, 以得到第一测量信息。
可选地, 作为另一实施例, UE 600还可以包括发送单元 630。
发送单元 630可以向基站发送第一测量信息。接收单元 610还可以接收 基站通过最优波束并根据第一测量信息发送的数据。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI。 或者, 第一测 量信息可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为另一实施例, 接收单元 610可以接收基站分别通过一组波 束中的 n个波束发送的导频信号,一组波束是基站从由 m个波束划分得到的 q组波束中选择的, 每组波束包括 n个波束, 在 q组波束中一组波束的上行 接收功率之和最大。
可选地, 作为另一实施例, 一组波束中的 n个波束与 n种导频信号配置 ——对应, 导频信号配置用于指示导频信号占用的时频资源。 接收单元 610 可以接收基站分别通过一组波束中的 n个波束根据 n种导频配置发送的导频 信号。
可选地, 作为另一实施例, 接收单元 610还可以在接收基站分别通过一 组波束中的 n个波束根据 n种导频配置发送的导频信号之前,接收基站发送 的第二信令, 第二信令用于指示 n种导频信号配置、 发送导频信号的起始时 刻和发送周期;
测量单元 620可以根据第二信令对导频信号进行测量, 以得到 n个测量 结果。
可选地,作为另一实施例,发送单元 630可以向基站发送第二测量信息, 第二测量信息包括 n个测量结果。接收单元 610还可以接收基站通过数据传 输波束发送的数据,数据传输波束是基站根据一组波束和第二测量信息确定 的。
可选地, 作为另一实施例, n 个测量结果中的每个测量结果可以包括 CQI。 或者, 每个测量结果可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为一个实施例, 上述导频信号可以为 CSI-RS。
图 6的 UE 600的其它功能和操作可以参照上面图 1至图 4的方法实施 例中涉及 UE的过程, 为了避免重复, 此处不再赘述。
图 7是根据本发明另一实施例的基站的示意框图。 图 7的基站 700包括 处理器 710和发送器 720。
处理器 710利用天线加权的方式, 形成 m个波束, m为大于 1的正整 数。处理器 710还根据用户设备 UE的上行探测信号确定 m个波束中每个波 束的上行接收功率。处理器 710还根据 m个波束中每个波束的上行接收功率 从 m个波束中选择 n个波束, n为正整数, 且 n<m。 发送器 720通过 n个波 束, 向 UE发送导频信号。
本发明实施例中,通过根据 UE的上行探测信号确定 m个波束中每个波 束的上行接收功率, 并根据 m个波束中每个波束的上行接收功率从 m个波 束中选择 n个波束来向 UE发送导频信号, 而非通过所有波束向 UE发送导 频信号, 从而能够提高为 UE配置导频信号的灵活性, 并且能够降低 UE对 导频信号的测量复杂度。
可选地,作为一个实施例,处理器 710可以从 m个波束中选择最优波束, 其中在 m个波束中最优波束的上行接收功率最大。发送器 720可以通过最优 波束, 向 UE发送导频信号。
可选地, 作为另一实施例, 发送器 720还可以在通过最优波束向 UE发 送导频信号之前, 向 UE发送第一信令, 第一信令用于指示最优波束对应的 导频信号配置、 发送导频信号的起始时刻和发送周期, 导频信号配置用于指 示导频信号所占用的时频资源。
可选地,作为另一实施例,基站 700还可以包括接收器 730。接收器 730 在发送器 720通过最优波束向 UE发送导频信号之后, 从 UE接收第一测量 信息, 第一测量信息是 UE根据第一信令对导频信号测量得到。 发送器 720 还可以通过最优波束, 根据第一测量信息向 UE发送数据。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI。 或者, 第一测 量信息可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地,作为另一实施例,处理器 710可以根据 m个波束中每个波束的 上行接收功率, 确定 q组波束中每组波束的上行接收功率之和, 其中 q组波 束是对 m个波束划分得到的,每组波束包括 n个波束, 然后可以从 q组波束 中选择一组波束,使得在 q组波束中选择的一组波束的上行接收功率之和最 大。
可选地, 作为另一实施例, 选择的一组波束中 n个波束可以与 n种导频 信号配置一一对应, 导频信号配置分别用于导频信号所占用的时频资源。 发 送器 720可以分别通过选择的一组波束中的 n个波束, ^据 n种导频信号配 置向 UE发送导频信号。
可选地, 作为另一实施例, 发送器 720还可以在分别通过选择的一组波 束中的 n个波束, 根据 n种导频信号配置向 UE发送导频信号之前, 向 UE 发送第二信令, 第二信令用于指示 n种导频信号配置、 发送导频信号的起始 时刻和发送周期。
可选地, 作为另一实施例, 接收器 730可以在发送器 720分别通过所选 择的一组波束中的 n个波束根据 n种导频信号配置向 UE发送导频信号之后, 从 UE接收第二测量信息, 第二测量信息包括 UE根据第二信令对导频信号 测量得到的 n个测量结果。处理器 710还可以根据选择的一组波束和第二测 量信息, 确定 UE对应的数据传输波束。 发送器 720还可以通过数据传输波 束, 向 UE发送数据。 可选地, 作为另一实施例, 处理器 710可以确定 n个测量结果分别对应 的谱效率, 并可以根据 n个测量结果分别对应的谱效率, 在 n个测量结果中 确定最优的测量结果,其中在 n个测量结果中最优的测量结果对应的谱效率 最大。 然后处理器 710可以根据最优的测量结果和选择的一组波束, 确定数 据传输波束。
可选地, 作为另一实施例, n 个测量结果中的每个测量结果可以包括 CQI。 或者, 每个测量结果可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为一个实施例, 上述导频信号可以为 CSI-RS。
图 7的基站 700的其它功能和操作可以参照上面图 1至图 4的方法实施 例中涉及基站的过程, 为了避免重复, 此处不再赘述。
图 8是根据本发明另一实施例的 UE的示意框图。 图 8的 UE 800包括 接收器 810和处理器 820。
接收器 810接收基站通过 n个波束发送的导频信号, n个波束是基站根 据所形成的 m个波束中每个波束的上行接收功率从 m个波束中选择的, m 为大于 1的正整数, n为正整数, 且 n<m。 处理器 820对导频信号进行测量。
本发明实施例中, 通过测量基站通过 n个波束发送的导频信号, 而 n个 波束是从 m个波束选择的, 从而能够降低测量复杂度。 而且, 基站通过 m 个波束中的 n个波束发送导频信号,能够提高为 UE配置导频信号的灵活性。
可选地, 作为一个实施例, 接收器 810可以接收基站通过最优波束发送 的导频信号, 其中在 m个波束中最优波束的上行接收功率最大。
可选地, 作为另一实施例, 接收器 810还可以在接收基站通过最优波束 发送的导频信号之前, 接收基站发送的第一信令, 第一信令用于指示最优波 束对应的导频信号配置、 发送导频信号的起始时刻和发送周期, 导频信号配 置用于指示导频信号所占用的时频资源。处理器 820可以根据第一信令对导 频信号进行测量, 以得到第一测量信息。
可选地, 作为另一实施例, UE 800还可以包括发送器 830。
发送器 830可以向基站发送第一测量信息。接收器 810还可以接收基站 通过最优波束并根据第一测量信息发送的数据。
可选地, 作为另一实施例, 第一测量信息可以包括 CQI。 或者, 第一测 量信息可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为另一实施例, 接收器 810可以接收基站分别通过一组波束 中的 n个波束发送的导频信号,一组波束是基站从由 m个波束划分得到的 q 组波束中选择的, 每组波束包括 n个波束, 在 q组波束中一组波束的上行接 收功率之和最大。
可选地, 作为另一实施例, 一组波束中的 n个波束与 n种导频信号配置 一一对应, 导频信号配置用于指示导频信号占用的时频资源。 接收器 810可 以接收基站分别通过一组波束中的 n个波束根据 n种导频配置发送的导频信 号。
可选地, 作为另一实施例, 接收器 810还可以在接收基站分别通过一组 波束中的 n个波束根据 n种导频配置发送的导频信号之前,接收基站发送的 第二信令, 第二信令用于指示 n种导频信号配置、 发送导频信号的起始时刻 和发送周期;
接收器 810可以根据第二信令对导频信号进行测量, 以得到 n个测量结 果。
可选地, 作为另一实施例, 接收器 810可以向基站发送第二测量信息, 第二测量信息包括 n个测量结果。接收器 810还可以接收基站通过数据传输 波束发送的数据, 数据传输波束是基站根据一组波束和第二测量信息确定 的。
可选地, 作为另一实施例, n 个测量结果中的每个测量结果可以包括 CQI。 或者, 每个测量结果可以包括 CQI, 以及以下至少一种: 秩, PMI。
可选地, 作为一个实施例, 上述导频信号可以为 CSI-RS。
图 8的 UE 800的其它功能和操作可以参照上面图 1至图 4的方法实施 例中涉及 UE的过程, 为了避免重复, 此处不再赘述。
本领域普通技术人员可以意识到, 结合本文中所公开的实施例描述的各 示例的单元及算法步骤, 能够以电子硬件、 或者计算机软件和电子硬件的结 合来实现。 这些功能究竟以硬件还是软件方式来执行, 取决于技术方案的特 定应用和设计约束条件。 专业技术人员可以对每个特定的应用来使用不同方 法来实现所描述的功能, 但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到, 为描述的方便和筒洁, 上述描 述的系统、 装置和单元的具体工作过程, 可以参考前述方法实施例中的对应 过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统、 装置和 方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅是示 意性的, 例如, 所述单元的划分, 仅仅为一种逻辑功能划分, 实际实现时可 以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成到另一个 系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论的相互之间 的耦合或直接耦合或通信连接可以是通过一些接口, 装置或单元的间接耦合 或通信连接, 可以是电性, 机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本实施例方案的目的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在一 个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使 用时, 可以存储在一个计算机可读取存储介质中。 基于这样的理解, 本发明 的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部 分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。 而前 述的存储介质包括: U盘、移动硬盘、只读存储器( ROM , Read-Only Memory )、 随机存取存储器(RAM, Random Access Memory ), 磁碟或者光盘等各种可 以存储程序代码的介质。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应以所述权利要求的保护范围为准。

Claims

权利要求
1. 一种通信方法, 其特征在于, 包括:
利用天线加权的方式, 形成 m个波束, m为大于 1的正整数; 根据用户设备 UE的上行探测信号,确定 m个波束中每个波束的上行接 收功率;
根据所述 m个波束中每个波束的上行接收功率, 从所述 m个波束中选 择 n个波束, n为正整数, 且 n<m;
通过所述 n个波束, 向所述 UE发送导频信号。
2. 根据权利要求 1所述的方法, 其特征在于, 所述根据所述 m个波束 中每个波束的上行接收功率, 从所述 m个波束中选择 n个波束, 包括: 从所述 m个波束中选择最优波束, 其中在所述 m个波束中所述最优波 束的上行接收功率最大;
所述通过所述 n个波束, 向所述 UE发送导频信号, 包括:
通过所述最优波束, 向所述 UE发送导频信号。
3. 根据权利要求 2所述的方法, 其特征在于, 在所述通过所述最优波 束向所述 UE发送导频信号之前, 所述方法还包括:
向所述 UE发送第一信令, 所述第一信令用于指示所述最优波束对应的 导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信号配 置用于指示所述导频信号所占用的时频资源。
4. 根据权利要求 3所述的方法, 其特征在于, 在所述通过所述最优波 束向所述 UE发送所述导频信号之后, 还包括:
从所述 UE接收第一测量信息, 所述第一测量信息是所述 UE根据所述 第一信令对所述导频信号测量得到;
通过所述最优波束, 根据所述第一测量信息向所述 UE发送数据。
5. 根据权利要求 4所述的方法, 其特征在于, 所述第一测量信息包括 信道质量指示 CQI;
或者, 所述第一测量信息包括所述 CQI, 以及以下至少一种: 秩, 预编 码矩阵指示 PMI。
6. 根据权利要求 1所述的方法, 其特征在于, 所述根据所述 m个波束 中每个波束的上行接收功率, 从所述 m个波束中选择 n个波束, 包括: 根据所述 m个波束中每个波束的上行接收功率,确定 q组波束中每组波 束的上行接收功率之和, 其中所述 q组波束是对所述 m个波束划分得到的, 每组波束包括 n个波束;
从所述 q组波束中选择一组波束,使得在所述 q组波束中所述选择的一 组波束的上行接收功率之和最大。
7. 根据权利要求 6所述的方法, 其特征在于, 所述选择的一组波束中 n 个波束与 n种导频信号配置——对应, 所述导频信号配置分别用于所述导频 信号所占用的时频资源;
所述通过所述 n个波束, 向所述 UE发送导频信号, 包括:
分别通过所述选择的一组波束中的 n个波束,根据所述 n种导频信号配 置向所述 UE发送导频信号。
8. 根据权利要求 7所述的方法, 其特征在于, 在所述分别通过所述选 择的一组波束中的 n个波束, 根据所述 n种导频信号配置向所述 UE发送导 频信号之前, 还包括:
向所述 UE发送第二信令, 所述第二信令用于指示所述 n种导频信号配 置、 发送所述导频信号的起始时刻和发送周期。
9. 根据权利要求 8所述的方法, 其特征在于, 在所述分别通过所述选 择的一组波束中的 n个波束, 根据所述 n种导频信号配置向所述 UE发送导 频信号之后, 还包括:
从所述 UE接收第二测量信息, 所述第二测量信息包括所述 UE根据所 述第二信令对所述导频信号测量得到的 n个测量结果;
根据所述选择的一组波束和所述第二测量信息, 确定所述 UE对应的数 据传输波束;
通过所述数据传输波束, 向所述 UE发送数据。
10. 根据权利要求 9所述的方法, 其特征在于, 所述根据所述选择的一 组波束和所述第二测量信息, 确定所述 UE对应的数据传输波束, 包括: 确定所述 n个测量结果分别对应的谱效率;
根据所述 n个测量结果分别对应的谱效率,在所述 n个测量结果中确定 最优的测量结果, 其中在所述 n个测量结果中所述最优的测量结果对应的谱 效率最大;
根据所述最优的测量结果和所述选择的一组波束,确定所述数据传输波 束。
11. 根据权利要求 9或 10所述的方法, 其特征在于,
所述 n个测量结果中的每个测量结果包括信道质量指示 CQI;
或者, 所述每个测量结果包括所述 CQI, 以及以下至少一种: 秩, 预编 码矩阵指示 PMI。
12. 根据权利要求 1至 11 中任一项所述的方法, 其特征在于, 所述导 频信号为信道状态信息参考信号 CSI-RS。
13. 一种通信方法, 其特征在于, 包括:
接收基站通过 n个波束发送的导频信号, 所述 n个波束是所述基站根据 所形成的 m个波束中每个波束的上行接收功率从所述 m个波束中选择的, m为大于 1的正整数, n为正整数, 且 n<m;
对所述导频信号进行测量。
14. 根据权利要求 13所述的方法, 其特征在于, 所述接收基站通过 n 个波束发送的导频信号, 包括:
接收所述基站通过最优波束发送的导频信号,其中在所述 m个波束中最 优波束的上行接收功率最大。
15. 根据权利要求 14所述的方法, 其特征在于, 在所述接收基站通过 最优波束发送的所述导频信号之前, 还包括:
接收所述基站发送的第一信令,所述第一信令用于指示所述最优波束对 应的导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信 号配置用于指示所述导频信号所占用的时频资源;
所述对所述导频信号进行测量, 包括:
根据所述第一信令对所述导频信号进行测量, 以得到第一测量信息。
16. 根据权利要求 15所述的方法, 其特征在于, 还包括:
向所述基站发送所述第一测量信息;
接收所述基站通过所述最优波束并根据所述第一测量信息发送的数据。
17. 根据权利要求 15或 16所述的方法, 其特征在于, 所述第一测量信 息包括信道质量指示 CQI;
或者, 所述第一测量信息包括所述 CQI, 以及以下至少一种: 秩, 预编 码矩阵指示 PMI。
18. 根据权利要求 13所述的方法, 其特征在于, 所述接收基站通过 n 个波束发送的导频信号, 包括: 接收所述基站分别通过一组波束中的 n个波束发送的导频信号, 所述一 组波束是所述基站从由所述 m个波束划分得到的 q组波束中选择的,每组波 束包括 n个波束,在所述 q组波束中所述一组波束的上行接收功率之和最大。
19. 根据权利要求 18所述的方法, 其特征在于, 所述一组波束中的 n 个波束与 n种导频信号配置一一对应, 所述导频信号配置用于指示所述导频 信号占用的时频资源;
所述接收所述基站通过一组波束中的 n个波束发送的导频信号, 包括: 接收所述基站分别通过所述一组波束中的 n个波束 ^据所述 n种导频配 置发送的导频信号。
20. 根据权利要求 19所述的方法, 其特征在于, 在所述接收所述基站 分别通过所述一组波束中的 n个波束根据所述 n种导频配置发送的导频信号 之前, 包括:
接收所述基站发送的第二信令,所述第二信令用于指示所述 n种导频信 号配置、 发送所述导频信号的起始时刻和发送周期;
所述对所述导频信号进行测量, 包括:
根据所述第二信令对所述导频信号进行测量, 以得到 n个测量结果。
21. 根据权利要求 20所述的方法, 其特征在于, 还包括:
向所述基站发送第二测量信息,所述第二测量信息包括所述 n个测量结 果;
接收所述基站通过数据传输波束发送的数据,所述数据传输波束是所述 基站根据所述一组波束和所述第二测量信息确定的。
22. 根据权利要求 20或 21所述的方法, 其特征在于, 所述 n个测量结 果中的每个测量结果包括信道质量指示 CQI;
或者, 所述每个测量结果包括所述 CQI, 以及以下至少一种: 秩, 预编 码矩阵指示 PMI。
23. 根据权利要求 13至 22中任一项所述的方法, 其特征在于, 所述导 频信号为信道状态信息参考信号 CSI-RS。
24. 一种基站, 其特征在于, 包括:
加权单元, 用于利用天线加权的方式, 形成 m个波束, m为大于 1的 正整数;
第一确定单元, 用于根据用户设备 UE的上行探测信号, 确定 m个波束 中每个波束的上行接收功率;
选择单元,用于根据所述 m个波束中每个波束的上行接收功率,从所述 m个波束中选择 n个波束, n为正整数, 且 n<m;
发送单元, 用于通过所述 n个波束, 向所述 UE发送导频信号。
25. 根据权利要求 24所述的基站, 其特征在于, 所述选择单元, 具体 用于从所述 m个波束中选择最优波束, 其中在所述 m个波束中所述最优波 束的上行接收功率最大;
所述发送单元,具体用于通过所述最优波束,向所述 UE发送导频信号。
26. 根据权利要求 25所述的基站, 其特征在于,
所述发送单元, 还用于在所述通过所述最优波束向所述 UE发送导频信 号之前, 向所述 UE发送第一信令, 所述第一信令用于指示所述最优波束对 应的导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导频信 号配置用于指示所述导频信号所占用的时频资源。
27. 根据权利要求 26所述的基站, 其特征在于, 还包括第一接收单元; 所述第一接收单元, 用于在所述发送单元通过所述最优波束向所述 UE 发送所述导频信号之后, 从所述 UE接收第一测量信息, 所述第一测量信息 是所述 UE根据所述第一信令对所述导频信号测量得到;
所述发送单元, 还用于通过所述最优波束, 根据所述第一测量信息向所 述 UE发送数据。
28. 根据权利要求 24所述的基站, 其特征在于, 所述选择单元, 具体 用于:根据所述 m个波束中每个波束的上行接收功率,确定 q组波束中每组 波束的上行接收功率之和,其中所述 q组波束是对所述 m个波束划分得到的, 每组波束包括 n个波束; 从所述 q组波束中选择一组波束, 使得在所述 q组 波束中所述选择的一组波束的上行接收功率之和最大。
29. 根据权利要求 28所述的基站, 其特征在于, 所述选择的一组波束 中 n个波束与 n种导频信号配置——对应,所述导频信号配置分别用于所述 导频信号所占用的时频资源;
所述发送单元, 具体用于分别通过所述选择的一组波束中的 n个波束, 根据所述 n种导频信号配置向所述 UE发送导频信号。
30. 根据权利要求 29所述的基站, 其特征在于,
所述发送单元,还用于在所述分别通过所述选择的一组波束中的 n个波 束, 根据所述 n种导频信号配置向所述 UE发送导频信号之前, 向所述 UE 发送第二信令, 所述第二信令用于指示所述 n种导频信号配置、 发送所述导 频信号的起始时刻和发送周期。
31. 根据权利要求 30所述的基站, 其特征在于, 还包括第二接收单元 和第二确定单元;
所述第二接收单元, 用于在所述发送单元分别通过所述选择的一组波束 中的 n个波束, 根据所述 n种导频信号配置向所述 UE发送导频信号之后, 从所述 UE接收第二测量信息, 所述第二测量信息包括所述 UE根据所述第 二信令对所述导频信号测量得到的 n个测量结果;
所述第二确定单元,还用于根据所述选择的一组波束和所述第二测量信 息, 确定所述 UE对应的数据传输波束;
所述发送单元, 还用于通过所述数据传输波束, 向所述 UE发送数据。
32. 根据权利要求 31所述的基站, 其特征在于, 所述第二确定单元, 具体用于: 确定所述 n个测量结果分别对应的谱效率; 根据所述 n个测量结 果分别对应的谱效率, 在所述 n个测量结果中确定最优的测量结果, 其中在 所述 n个测量结果中所述最优的测量结果对应的谱效率最大; 根据所述最优 的测量结果和所述选择的一组波束, 确定所述数据传输波束。
33. 一种用户设备, 其特征在于, 包括:
接收单元, 用于接收基站通过 n个波束发送的导频信号, 所述 n个波束 是基站根据所形成的 m个波束中每个波束的上行接收功率从所述 m个波束 中选择的, m为大于 1的正整数, n为正整数, 且 n<m;
测量单元, 用于对所述导频信号进行测量。
34. 根据权利要求 33所述的用户设备, 其特征在于, 所述接收单元, 具体用于接收所述基站通过最优波束发送的导频信号,其中在所述 m个波束 中最优波束的上行接收功率最大。
35. 根据权利要求 34所述的用户设备, 其特征在于,
所述接收单元,还用于在所述接收基站通过最优波束发送的所述导频信 号之前, 接收所述基站发送的第一信令, 所述第一信令用于指示所述最优波 束对应的导频信号配置、 发送所述导频信号的起始时刻和发送周期, 所述导 频信号配置用于指示所述导频信号所占用的时频资源;
所述测量单元, 具体用于根据所述第一信令对所述导频信号进行测量, 以得到第一测量信息。
36. 根据权利要求 35所述的用户设备, 其特征在于, 还包括发送单元; 所述发送单元, 用于向所述基站发送所述第一测量信息;
所述接收单元,还用于接收所述基站通过所述最优波束并根据所述第一 测量信息发送的数据。
37. 根据权利要求 33所述的用户设备, 其特征在于, 所述接收单元, 具体用于接收所述基站分别通过一组波束中的 n个波束发送的导频信号, 所 述一组波束是所述基站从由所述 m个波束划分得到的 q组波束中选择的,每 组波束包括 n个波束,在所述 q组波束中所述一组波束的上行接收功率之和 最大。
38. 根据权利要求 37所述的用户设备, 其特征在于, 所述一组波束中 的 n个波束与 n种导频信号配置——对应,所述导频信号配置用于指示所述 导频信号占用的时频资源;
所述接收单元, 具体用于接收所述基站分别通过所述一组波束中的 n个 波束根据所述 n种导频配置发送的导频信号。
39. 根据权利要求 38所述的用户设备, 其特征在于,
所述接收单元,还用于在所述接收所述基站分别通过所述一组波束中的 n个波束根据所述 n种导频配置发送的导频信号之前, 接收所述基站发送的 第二信令, 所述第二信令用于指示所述 n种导频信号配置、 发送所述导频信 号的起始时刻和发送周期;
所述测量单元, 具体用于根据所述第二信令对所述导频信号进行测量, 以得到 n个测量结果。
40. 根据权利要求 39所述的用户设备, 其特征在于, 还包括发送单元; 所述发送单元, 用于向所述基站发送第二测量信息, 所述第二测量信息 包括所述 n个测量结果;
所述接收单元, 还用于接收所述基站通过数据传输波束发送的数据, 所 述数据传输波束是所述基站根据所述一组波束和所述第二测量信息确定的。
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