CN102546138A - Beamforming method and device - Google Patents
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Abstract
The embodiment of the invention discloses a beamforming method and device relating to the technical field of wireless communiation and being used for avoiding the problem of overhigh load of a computing resource of a base station at the moment that a sounding reference signal (SRS) is received. In the invention, after the base station receives SRSs sent by a plurality of user equipment at the current subframe moment, the forming vectors of all user equipment using a beamforming transmission way in the plurality of user equipment can not be computed at the current subframe moment, but at least two subframe moments are selected, and the forming vector of part of the user equipment is computed at each moment, so that the problem of overhigh load of the computing resource of the base station at the current subframe moment because the forming vectors of all user equipment are computed at the current subframe moment is avoided.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for beamforming.
Background
Currently, a Beamforming algorithm (EBB) Based on Eigenvalue decomposition is widely used in a Beamforming technology adopted in a multi-antenna system.
According to the EBB algorithm, at the time of receiving a subframe of a Sounding Reference Signal (SRS) sent by User Equipment (UE), channel estimation is carried out according to the received SRS to obtain a channel correlation matrix, a forming vector of the UE sending the SRS is calculated according to the channel correlation matrix, before downlink data is sent to the UE by each downlink subframe in the later SRS period, the forming vector of the UE is required to be used for carrying out wave beam forming on the downlink data to be sent, and then the downlink data after wave beam forming is sent.
The shaped vector calculated in the EBB algorithm is an eigenvector corresponding to the maximum eigenvalue of the channel correlation matrix. The eigenvector needs to be obtained through eigenvalue decomposition of a channel correlation matrix, and in an actual system, all methods for calculating the forming vector are iterative search methods, such as a power method, a Jacobian method and a subspace iteration method. The complexity of the implementation of these algorithms is high.
In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:
the eigenvalue decomposition of the channel correlation matrix is computationally complex. In a time division duplex long term evolution (TDD-LTE) system, in order to save uplink transmission resources, the SRS is usually configured in a special subframe for transmission, which results in: the base station needs to calculate the shaped vectors for all the UEs adopting the beam-forming transmission mode in the cell at the time of the special subframe, thereby causing the problem that the calculation resource load of the base station at the SRS receiving time is too heavy.
Disclosure of Invention
The embodiment of the invention provides a beam forming method and a beam forming device, which are used for avoiding the problem of overlarge calculation resource load of a base station at the SRS receiving moment.
A method of beamforming, the method comprising:
a base station receives Sounding Reference Signals (SRS) sent by a plurality of user equipment at the current subframe moment, and performs channel estimation on each received SRS according to the SRS to obtain a channel estimation result of the user equipment sending the SRS;
the base station determines at least two subframe moments where a shaped vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
An apparatus for beamforming, the apparatus comprising:
a signal receiving unit, configured to receive sounding reference signals SRS sent by multiple user equipments at a current subframe;
a channel estimation unit, configured to perform channel estimation on each received SRS according to the SRS, and obtain a channel estimation result of a user equipment that transmits the SRS;
the beam forming unit is used for determining at least two subframe moments where a formed vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
A base station comprises the beam forming device.
In the scheme, after receiving the SRS sent by the plurality of user equipment at the current subframe time, the base station does not calculate the shaped vectors of all the user equipment using the beam-forming transmission mode in the plurality of user equipment at the current subframe time, but selects at least two subframe times and calculates the shaped vectors of a part of the user equipment at each subframe time, thereby avoiding the problem of heavy calculation resource load of the base station at the current subframe time caused by calculating the shaped vectors of all the user equipment at the current subframe time.
Drawings
FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 2A is a diagram illustrating adjustment of a calculation time of a shaped vector according to an embodiment of the present invention;
fig. 2B is a schematic diagram illustrating an implementation of selecting a forming vector calculation time according to a CQI of a user in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to avoid the problem of excessive load of computing resources of a base station at the SRS receiving time, an embodiment of the present invention provides a beamforming method, where after the base station receives SRSs sent by a plurality of user equipments at the current subframe time, the base station does not calculate beamforming vectors of all the user equipments using a beamforming transmission mode in the plurality of user equipments at the current subframe time, but selects at least two subframe times, and calculates beamforming vectors of a part of the user equipments at each subframe time.
Referring to fig. 1, a beamforming method provided in the embodiment of the present invention includes the following steps:
step 10: the base station receives the SRS sent by a plurality of user equipment at the current subframe moment, and performs channel estimation on each received SRS according to the SRS to obtain a channel estimation result of the user equipment sending the SRS;
here, the channel estimation result includes correlation information for calculating a channel correlation matrix, and the like. When calculating the forming vector of the user equipment, firstly, a channel correlation matrix is calculated according to a channel estimation result of the user equipment, and then eigenvalue decomposition is carried out on the correlation matrix to obtain the forming vector.
Step 11: the base station determines at least two subframe moments where a shaped vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
Here, performing beamforming on downlink data to be sent to the user equipment according to the beamforming vector specifically includes: before each downlink subframe in the current SRS period sends downlink data to the user equipment at the moment, the beamforming vector of the user equipment is used for beamforming the downlink data to be sent, and then the downlink data after beamforming is sent.
Preferably, in order to ensure that the forming vectors of the same ue are not repeatedly calculated and the forming vectors of all ues are calculated, the ues selected for different subframe times in step 11 are different, and the set of ues selected for each subframe time includes all ues using beamforming transmission mode in the multiple ues.
In step 11, the base station determines at least two subframe moments where the shaped vector is calculated, and the specific implementation may be as follows:
and the base station determines at least two subframe moments of the current subframe moment for receiving the SRS, the downlink subframe moment after the current subframe moment and the uplink subframe moment after the current subframe moment as the subframe moments for calculating the forming vector.
Specifically, the base station may determine the current subframe time and a downlink subframe time after the current subframe time as the subframe time at which the shaped vector is calculated; for example, the current subframe time and the first downlink subframe time after the current subframe time are determined as the subframe time where the shaped vector is calculated; or,
the base station determines the current sub-frame time and an uplink sub-frame time after the current sub-frame time as the sub-frame time of the shaped vector; for example, the base station determines an uplink subframe time when the computing resource load after the current subframe time is less than a pre-set computing resource load threshold, and determines the determined uplink subframe time and the current subframe time as the subframe time where the shaped vector is computed; here, the method for determining whether the computing resource load at the uplink subframe time is less than the computing resource load threshold may be: and judging the number of the user equipment with the uplink service at the uplink subframe moment, if the number is smaller than a preset numerical value (the numerical value is an integer larger than 0), determining that the calculation resource load at the uplink subframe moment is smaller than a calculation resource load threshold, and otherwise, determining that the calculation resource load at the uplink subframe moment is not smaller than the calculation resource load threshold.
Preferably, the at least two subframe time points are located in the same SRS period, so that performance loss caused by late calculation of the shaped vector can be reduced.
In step 11, for each subframe time of the at least two subframe times, selecting a part of user equipments from the user equipments using the beamforming transmission method in the plurality of user equipments for the subframe time, which may be specifically implemented as follows:
firstly, a base station reads a stored Channel Quality Indication (CQI) value corresponding to user equipment using a beam forming transmission mode in a plurality of user equipment;
then, aiming at each sub-frame time in the at least two sub-frame times, the base station selects user equipment with a corresponding CQI value in a preset CQI value interval for the sub-frame time from the user equipment of the plurality of user equipment using the beam forming transmission mode; wherein the preset CQI value interval for each of the at least two subframe time points satisfies the following condition: the earlier the subframe time is, the smaller the CQI value in the preset CQI value interval for the subframe time is, so that the calculation of the shaped vector of the user with better transmission performance can be delayed as much as possible, and the calculation time of the shaped vector is not delayed as much as possible for the user with poorer transmission quality, so that the calculation resource of the shaped vector of the user with poorer transmission quality is preferentially ensured, and the performance loss caused by the delayed calculation of the shaped vector is further reduced.
Specifically, when the at least two subframe times include the current subframe time and a downlink subframe time after the current subframe time, the base station may select, for the current subframe time, a user equipment whose corresponding CQI value is smaller than a preset CQI threshold value from user equipments using a beamforming transmission manner among the plurality of user equipments; and selecting user equipment of which the corresponding CQI value is greater than the CQI threshold value from the user equipment using the beam forming transmission mode in the plurality of user equipment for a downlink subframe time after the current subframe time. The CQI threshold value may be a value greater than 0 and less than the highest CQI level.
Preferably, before the base station determines at least two subframe moments where the shaped vector is calculated, the base station may first determine whether the calculation resource load at the current subframe moment is greater than a preset calculation resource load threshold; if yes, executing step 11; if not, calculating the forming vectors of all the user equipment at the current subframe moment according to the prior art.
Specifically, the base station determines whether the computing resource load at the current subframe time is greater than a preset computing resource load threshold, and the specific implementation may be as follows:
firstly, for each user equipment using a beam forming transmission mode in the plurality of user equipments, a base station determines the times of channel correlation matrix eigenvalue decomposition required by the user equipment according to the forming granularity corresponding to the user equipment and the number of Physical Resource Blocks (PRBs) scheduled; specifically, the number of the scheduled PRBs may be divided by the forming granularity and then rounded up, and the rounded up result is used as the number of times of channel correlation matrix eigenvalue decomposition that the user equipment needs to perform;
and then, determining whether the sum of the times of decomposing the characteristic values of the channel correlation matrixes is greater than a preset decomposing time threshold value, if so, determining that the computing resource load at the current subframe moment is greater than a preset computing resource load threshold, and otherwise, determining that the computing resource load at the current subframe moment is not greater than the computing resource load threshold. The resolution number threshold may be an integer greater than 0.
In the method, in the time from the moment of receiving the SRS sent by the user equipment to the moment of calculating the shaped vector of the user equipment, the stored shaped vector calculated according to the SRS sent by the user equipment last time can be used for carrying out beam forming on the downlink data sent to the user equipment.
The invention is illustrated below with reference to specific examples:
this embodiment takes the case of configuring 2 an uplink subframe and a downlink subframe of type 2 in a TDD-LTE system as an example to describe the scheme of the present invention, as shown in fig. 2A:
assuming that SRSs sent by a plurality of user equipments are received in an uplink special time slot (UpPTS) in subframe 1, when it is determined that the calculation resource load at this moment is heavy, the calculation of the shaped vector of the user equipment with higher CQI is selected to be postponed to subframe 3.
The specific execution steps are shown in fig. 2B:
step 1: a base station receives SRS sent by N pieces of user equipment at UpPTS of a subframe 1, wherein N is an integer larger than 1;
step 2: the base station carries out channel estimation on each received SRS according to the SRS to obtain a channel estimation result of user equipment which sends the SRS, and stores the channel estimation result of each user equipment;
and step 3: setting the value of i to 0;
and 4, step 4: the base station judges whether the stored CQI _ i is smaller than the CQI _ TH, if so, the step 5 is carried out, otherwise, the step 6 is carried out; CQI _ i is a CQI value corresponding to the user equipment i, and CQI _ TH is a preset CQI threshold value;
and 5: calculating and storing a forming vector of the user equipment i at the time of a subframe 1 according to a channel estimation result of the user equipment i, then carrying out beam forming on downlink data needing to be sent to the user equipment i according to the forming vector, if i is smaller than N-1, adding 1 to a value of i, and returning to the step 4, otherwise, ending the process;
step 6: calculating and storing a forming vector of the user equipment i at the time of the subframe 3 according to a channel estimation result of the user equipment i, and then carrying out beam forming on downlink data needing to be sent to the user equipment i according to the forming vector; and if i is smaller than N-1, adding 1 to the value of i, and returning to the step 4, otherwise, ending the process.
Referring to fig. 3, an embodiment of the present invention further provides a beamforming apparatus, where the apparatus includes:
a signal receiving unit 30, configured to receive sounding reference signals SRS sent by multiple user equipments at a current subframe;
a channel estimation unit 31, configured to perform channel estimation on each received SRS according to the SRS, and obtain a channel estimation result of a user equipment that transmits the SRS;
a beam forming unit 32, configured to determine at least two subframe moments where a formed vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
Further, the beamforming unit 32 is configured to:
and determining at least two subframe moments of the current subframe moment, the downlink subframe moment after the current subframe moment and the uplink subframe moment after the current subframe moment as the subframe moments where the shaped vectors are calculated.
Further, the beamforming unit 32 is configured to: determining the current subframe time and a downlink subframe time after the current subframe time as the subframe time of the shaped vector; or,
and determining an uplink subframe time when the computing resource load after the current subframe time is less than a preset computing resource load threshold, and determining the uplink subframe time and the current subframe time as the subframe time of the shaped vector.
Further, the at least two subframe time points are located in the same SRS period.
Further, the beamforming unit 32 is configured to:
reading a stored channel quality indication CQI value corresponding to the user equipment using the beamforming transmission mode in the plurality of user equipment;
selecting user equipment with a corresponding CQI value within a preset CQI value interval for each subframe time in the at least two subframe times from the user equipment using the beamforming transmission mode in the plurality of user equipment; wherein the preset CQI value interval for each of the at least two subframe time points satisfies the following condition: the earlier the subframe time, the smaller the CQI value in the CQI value interval preset for the subframe time.
Further, the beamforming unit 32 is configured to:
when the at least two subframe moments comprise the current subframe moment and a downlink subframe moment after the current subframe moment, selecting user equipment of which the corresponding CQI value is smaller than a preset CQI threshold value from the user equipment using a beam forming transmission mode in the plurality of user equipment for the current subframe moment;
and selecting user equipment of which the corresponding CQI value is greater than the CQI threshold value from the user equipment using the beam forming transmission mode in the plurality of user equipment for a downlink subframe time after the current subframe time.
Further, the apparatus further comprises:
the load judgment unit 33 is configured to determine whether the computing resource load at the current subframe time is greater than a preset computing resource load threshold before determining at least two subframe times at which the shaped vector is computed;
the beamforming unit 32 is configured to:
and when the calculation resource load of the current subframe moment is determined to be larger than the calculation resource load threshold, determining at least two subframe moments where the shaped vector is calculated.
Further, the load judgment unit 33 is configured to:
for each user equipment using a beam forming transmission mode in the plurality of user equipments, determining the times of channel correlation matrix eigenvalue decomposition required by the user equipment according to the forming granularity corresponding to the user equipment and the number of Physical Resource Blocks (PRBs) scheduled;
and determining whether the sum of the times of decomposing the characteristic values of the channel correlation matrixes is greater than a preset decomposing time threshold value, if so, determining that the computing resource load at the current subframe moment is greater than a preset computing resource load threshold, and otherwise, determining that the computing resource load at the current subframe moment is not greater than the computing resource load threshold.
The embodiment of the invention also provides a base station, which comprises the beam forming device.
In conclusion, the beneficial effects of the invention include:
in the scheme provided by the embodiment of the invention, after a base station receives SRS sent by a plurality of user equipment at the current subframe moment, the base station carries out channel estimation on each received SRS according to the SRS to obtain the channel estimation result of the user equipment sending the SRS; determining at least two subframe moments where a shaped vector is calculated; and aiming at each subframe time of the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector. Therefore, in the scheme, after receiving the SRSs sent by the multiple user equipments at the current subframe time, the base station does not calculate the forming vectors of all the user equipments using the beam forming transmission mode in the multiple user equipments at the current subframe time, but selects at least two subframe times, and calculates the forming vectors of a part of the user equipments at each subframe time, thereby avoiding the problem of heavy calculation resource load of the base station at the current subframe time caused by calculating the forming vectors of all the user equipments at the current subframe time.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (15)
1. A method for beamforming, the method comprising:
a base station receives Sounding Reference Signals (SRS) sent by a plurality of user equipment at the current subframe moment, and performs channel estimation on each received SRS according to the SRS to obtain a channel estimation result of the user equipment sending the SRS;
the base station determines at least two subframe moments where a shaped vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
2. The method of claim 1, wherein the base station determines at least two subframe times at which the shaped vector is calculated, and specifically comprises:
and the base station determines at least two subframe moments of the current subframe moment, the downlink subframe moment after the current subframe moment and the uplink subframe moment after the current subframe moment as the subframe moments where the shaped vectors are calculated.
3. The method of claim 1, wherein the at least two subframe time instants are within a same SRS period.
4. The method according to any one of claims 1 to 3, wherein for each of the at least two subframe time instances, selecting a part of the user equipments from the user equipments using the beamforming transmission scheme in the plurality of user equipments for the subframe time instance specifically includes:
the base station reads the stored channel quality indication CQI value corresponding to the user equipment using the beam forming transmission mode in the plurality of user equipment;
the base station selects user equipment with a corresponding CQI value in a preset CQI value interval for each subframe time in the at least two subframe times from the user equipment using the beamforming transmission mode in the plurality of user equipment; wherein the preset CQI value interval for each of the at least two subframe time points satisfies the following condition: the earlier the subframe time, the smaller the CQI value in the CQI value interval preset for the subframe time.
5. The method according to claim 4, wherein when the at least two subframe times include the current subframe time and a downlink subframe time after the current subframe time, the base station selects, for each subframe time of the at least two subframe times, a user equipment whose corresponding CQI value is within a CQI value interval preset for the subframe time from among user equipments using a beamforming transmission scheme, which is among the plurality of user equipments, specifically includes:
the base station selects user equipment of which the corresponding CQI value is smaller than a preset CQI threshold value from the user equipment using the beam forming transmission mode in the plurality of user equipment at the current subframe moment;
and the base station selects user equipment of which the corresponding CQI value is greater than the CQI threshold value from the user equipment using the beam forming transmission mode in the plurality of user equipment for a downlink subframe time after the current subframe time.
6. The method of any of claims 1-3, wherein prior to the base station determining at least two subframe times at which the shaped vector is calculated, further comprising:
the base station determines whether the calculation resource load of the current subframe is greater than a preset calculation resource load threshold or not;
the base station determines at least two subframe moments where the shaped vector is calculated to comprise:
and when the base station determines that the calculation resource load of the current subframe moment is greater than the calculation resource load threshold, determining at least two subframe moments where the shaped vector is calculated.
7. The method of claim 6, wherein the base station determines whether the computational resource load at the current subframe time is greater than a pre-set computational resource load threshold, specifically comprising:
the base station determines the times of channel correlation matrix eigenvalue decomposition required by the user equipment according to the corresponding beamforming granularity and the number of Physical Resource Blocks (PRBs) scheduled by the user equipment for each user equipment using a beamforming transmission mode in the plurality of user equipment;
and determining whether the sum of the times of decomposing the characteristic values of the channel correlation matrixes is greater than a preset decomposing time threshold value, if so, determining that the computing resource load at the current subframe moment is greater than a preset computing resource load threshold, and otherwise, determining that the computing resource load at the current subframe moment is not greater than the computing resource load threshold.
8. A beamforming apparatus, the apparatus comprising:
a signal receiving unit, configured to receive sounding reference signals SRS sent by multiple user equipments at a current subframe;
a channel estimation unit, configured to perform channel estimation on each received SRS according to the SRS, and obtain a channel estimation result of a user equipment that transmits the SRS;
the beam forming unit is used for determining at least two subframe moments where a formed vector is calculated; and aiming at each subframe time in the at least two subframe times, selecting part of user equipment from the user equipment using the beam forming transmission mode in the plurality of user equipment for the subframe time, calculating a forming vector of the user equipment at the subframe time according to a channel estimation result of the selected user equipment, and carrying out beam forming on downlink data needing to be sent to the user equipment according to the forming vector.
9. The apparatus of claim 8, wherein the beamforming unit is to:
and determining at least two subframe moments of the current subframe moment, the downlink subframe moment after the current subframe moment and the uplink subframe moment after the current subframe moment as the subframe moments where the shaped vectors are calculated.
10. The apparatus of claim 8, in which the at least two subframe time instants are within a same SRS period.
11. The apparatus of any of claims 8-10, wherein the beamforming unit is to:
reading a stored channel quality indication CQI value corresponding to the user equipment using the beamforming transmission mode in the plurality of user equipment;
selecting user equipment with a corresponding CQI value within a preset CQI value interval for each subframe time in the at least two subframe times from the user equipment using the beamforming transmission mode in the plurality of user equipment; wherein the preset CQI value interval for each of the at least two subframe time points satisfies the following condition: the earlier the subframe time, the smaller the CQI value in the CQI value interval preset for the subframe time.
12. The apparatus of claim 11, wherein the beamforming unit is to:
when the at least two subframe moments comprise the current subframe moment and a downlink subframe moment after the current subframe moment, selecting user equipment of which the corresponding CQI value is smaller than a preset CQI threshold value from the user equipment using a beam forming transmission mode in the plurality of user equipment for the current subframe moment;
and selecting user equipment of which the corresponding CQI value is greater than the CQI threshold value from the user equipment using the beam forming transmission mode in the plurality of user equipment for a downlink subframe time after the current subframe time.
13. The apparatus of any of claims 8-10, further comprising:
the load judgment unit is used for determining whether the computing resource load of the current subframe moment is greater than a preset computing resource load threshold before determining at least two subframe moments where the shaped vector is computed;
the beam forming unit is used for:
and when the calculation resource load of the current subframe moment is determined to be larger than the calculation resource load threshold, determining at least two subframe moments where the shaped vector is calculated.
14. The apparatus of claim 13, wherein the load determination unit is to:
for each user equipment using a beam forming transmission mode in the plurality of user equipments, determining the times of channel correlation matrix eigenvalue decomposition required by the user equipment according to the forming granularity corresponding to the user equipment and the number of Physical Resource Blocks (PRBs) scheduled;
and determining whether the sum of the times of decomposing the characteristic values of the channel correlation matrixes is greater than a preset decomposing time threshold value, if so, determining that the computing resource load at the current subframe moment is greater than a preset computing resource load threshold, and otherwise, determining that the computing resource load at the current subframe moment is not greater than the computing resource load threshold.
15. A base station, characterized in that the base station comprises a beam forming apparatus according to any of claims 8-14.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330281A (en) * | 2015-06-18 | 2017-01-11 | 华为技术有限公司 | Beam forming method and device |
| CN108923834A (en) * | 2018-07-12 | 2018-11-30 | 瑞典爱立信有限公司 | Beam forming method and its network equipment |
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| CN106330281A (en) * | 2015-06-18 | 2017-01-11 | 华为技术有限公司 | Beam forming method and device |
| CN106330281B (en) * | 2015-06-18 | 2019-06-28 | 华为技术有限公司 | Beam form-endowing method and device |
| CN108923834A (en) * | 2018-07-12 | 2018-11-30 | 瑞典爱立信有限公司 | Beam forming method and its network equipment |
| CN108923834B (en) * | 2018-07-12 | 2020-02-21 | 瑞典爱立信有限公司 | Beam forming method and network equipment thereof |
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| CN102546138B (en) | 2014-07-09 |
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